EP3377770B1 - Pump device, service water system, method for operating the service water system and self-learning method for the pump device in the service water system - Google Patents

Pump device, service water system, method for operating the service water system and self-learning method for the pump device in the service water system Download PDF

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Publication number
EP3377770B1
EP3377770B1 EP16798445.9A EP16798445A EP3377770B1 EP 3377770 B1 EP3377770 B1 EP 3377770B1 EP 16798445 A EP16798445 A EP 16798445A EP 3377770 B1 EP3377770 B1 EP 3377770B1
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EP
European Patent Office
Prior art keywords
pump
hot water
delivery pump
delivery
water
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16798445.9A
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German (de)
French (fr)
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EP3377770A1 (en
Inventor
Oliver Laing
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xylem Europe GmbH
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Xylem Europe GmbH
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Publication of EP3377770A1 publication Critical patent/EP3377770A1/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00Details
    • F24D19/10Arrangement or mounting of control or safety devices
    • F24D19/1006Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1051Arrangement or mounting of control or safety devices for water heating systems for domestic hot water
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00Pumping installations or systems
    • F04D13/02Units comprising pumps and their driving means
    • F04D13/06Units comprising pumps and their driving means the pump being electrically driven
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0005Control, e.g. regulation, of pumps, pumping installations or systems by using valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0005Control, e.g. regulation, of pumps, pumping installations or systems by using valves
    • F04D15/0011Control, e.g. regulation, of pumps, pumping installations or systems by using valves by-pass valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0077Safety measures
    • F04D15/0083Protection against sudden pressure change, e.g. check valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/02Stopping of pumps, or operating valves, on occurrence of unwanted conditions
    • F04D15/0209Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D17/00Domestic hot-water supply systems
    • F24D17/0078Recirculation systems

Definitions

  • the invention relates to a pump device for arrangement on a recirculation line of a domestic water system.
  • the invention further relates to a domestic hot water system, comprising a hot water supply device, a hot water line which is connected to the hot water supply device and at which at least one tap is arranged, and a recirculation line which is connected to the hot water line and leads to the hot water supply device.
  • the invention further relates to a method for operating a domestic water system, comprising a hot water supply device, a hot water line with at least one tap, and a recirculation line.
  • the invention further relates to a self-learning method for a feed pump of a domestic water system.
  • a circulation control which comprises a sensor for the detection of hot water dispensing processes and subsequent triggering of a circulation pump upon request.
  • a microcontroller or microcomputer is provided for signal processing and control of the circulation pump.
  • a cyclically circulating habits memory and triggering starts of the circulation pump when a threshold value is exceeded due to the stored probability of need.
  • the stored value of the currently valid time of day interval is the output variable of a low-pass function, the input variable of which is formed from the cyclically sampled test results of tapping operations in the relevant interval and their Time constant is variable and in principle different for recognized or unrecognized dispensing processes.
  • Detected tapping processes are temporarily stored in a further memory with a cyclical structure and are only processed during the next day period to specify the contents of the habits memory. If the sensor for the detection of dispensing processes is a temperature sensor, whenever the riser pipe is already heated, its cooling rate is compared with a reference value in order to detect a dispensing process under this condition.
  • a circulating pump for a conveying liquid comprising an electric motor, which is electronically commutated, with a rotor, a stator and a motor circuit, and a paddle wheel, which is non-rotatably connected to the rotor.
  • the electric motor has an evaluation device, by means of which a flow rate of conveyed liquid through the circulation pump can be determined via a speed of the rotor and / or a power consumption of the electric motor.
  • At least one signal output is provided, at which a flow rate signal and / or flow rate-dependent switching signal can be provided by the circulation pump.
  • the invention has for its object to provide a pump device of the type mentioned, with which a domestic water system can be operated in a simple and convenient manner.
  • a feed pump, a check valve, and a bypass line for the check valve are provided, the bypass line being arranged parallel to the check valve, and a combination of check valve and bypass line being arranged in series with the feed pump.
  • Warm water can be circulated in a recirculation process using the feed pump.
  • the check valve prevents water from flowing out of a hot water supply device at high speed against a delivery direction of the feed pump through the feed pump.
  • the bypass line ensures that a small amount of warm water can still flow back into the feed pump. This can lead to a temperature change and, in particular, a relatively steep temperature change, which is detectable. This change in temperature is an indication of water being drawn off.
  • water tapping on the process water system can be detected via "on-board means" of the pump device, regardless of whether the feed pump is in operation or not.
  • a user pattern can then be determined by the pump device according to the invention, which in turn can be used in a self-learning process for controlling / setting / adapting the operation of the feed pump. This allows the domestic water system to be set accordingly operate comfortably. With a learned user pattern, significant cooling of hot water in a hot water pipe of the domestic water system via recirculation can be prevented at times when hot water is usually drawn off.
  • the pump device has a first connection, which is (directly) fluidly connected to the combination of check valve and bypass line, and which serves to connect the pump device to a hot water supply device.
  • a first connection which is (directly) fluidly connected to the combination of check valve and bypass line, and which serves to connect the pump device to a hot water supply device.
  • water from the hot water supply device is coupled into the pump device via the first connection.
  • the pump device also has a second connection, which is (directly) connected to the feed pump in a fluid-effective manner, water as the feed liquid flowing through the pump device from the second connection to the first connection when the feed pump is operating. In a "recirculation mode" of the feed pump, this conveys water from the recirculation line, which is connected to the second connection, into the hot water supply device, which is connected to the first connection.
  • the check valve is arranged and designed such that when water is drawn off it closes on a hot water line on which the recirculation line is arranged. This prevents “extensive” mixing of water from the hot water supply device and water from the recirculation device. Water from the hot water supply device can then not through the delivery pump at high speed through this stream.
  • the pressure in the provision of hot water in comparison to the pressure difference of the delivery device is usually sufficient to close the check valve.
  • the check valve advantageously ensures a closure both when the pump is operating and when the feed pump is at a standstill.
  • bypass line is arranged and designed such that a throughput of delivery liquid takes place through it, which is at most 15% of a throughput of delivery liquid through the pump device, when the check valve is open and the delivery pump is in operation. As a result, the "malfunction" caused by the open bypass line is low.
  • the bypass line has a hydraulic cross-sectional area which lies in the range between 5% and 15% of a hydraulic cross-sectional area of the recirculation line on which the pump device is arranged.
  • the lower limit can be used to prevent lime deposits or deposits of dirt particles from clogging the bypass line over a normal operating period.
  • the upper limit ensures that the influence of the bypass line on normal recirculation operation is minimized.
  • the pump device comprises a sensor device and an evaluation device, which is connected to the sensor device in a signal-effective manner, by means of which it can be detected when water is drawn from a hot water line to which the recirculation line is connected. It can then be recognized by means of the evaluation device when such dispensing processes are present. From this in turn, a user pattern can be determined in terms of its time dependency.
  • the sensor device is integrated in the feed pump and in particular is arranged within a housing of the feed pump. This results in a minimal amount of circuitry and there is no need for it Lines are routed to the domestic water system for a sensor device.
  • the evaluation device is integrated in the feed pump and is in particular arranged within a housing of the feed pump, and in particular is arranged on a carrier which is a carrier for a motor circuit of an electric motor of the feed pump or with such a Carrier is connected. This results in an optimized integration.
  • the evaluation device is part of the motor circuit or is identical to it.
  • the sensor device is arranged and designed and the evaluation device is designed such that the water tap can be detected both when the feed pump is running and when the feed pump is stopped. This allows a user pattern to be determined in a safe manner. This in turn enables safe and convenient operation.
  • the sensor device is arranged and designed and the evaluation device is designed such that, when the feed pump is running, a change in the flow rate of feed liquid through the feed pump and / or from the absolute flow rate can detect the water tapping.
  • a flow rate and in particular a change in the flow rate can be determined in a simple manner. This makes it easy to identify a water tap when the feed pump is operating.
  • the sensor device comprises a sensor for determining a speed of a rotor of an electric motor of the feed pump and / or a sensor for determining a power consumption of the electric motor
  • the evaluation device determines the flow rate from the speed and power consumption of the electric motor. For example, the speed is specified and the power consumption is measured or the Power consumption is specified and the speed is measured. This can then be determined on the basis of the known dependence of the flow rate on speed and power. In particular, a change can easily be determined.
  • the evaluation device continuously monitors the flow rate in order to be able to recognize a tap in time.
  • the sensor device has at least one temperature sensor, which is arranged in particular within the feed pump. Strong temperature changes can be identified via the temperature sensor, which can be attributed to a backflow of water from a hot water supply device into the feed pump. This allows water to be drawn off even when the feed pump is not in operation. For this detectability, no sensor (such as a temperature sensor) has to be provided outside the pump device.
  • the evaluation device monitors temperature signals provided by the at least one temperature sensor and, in particular in the event of a (specific) temperature change, provides a detection signal which indicates a backflow of water from the hot water supply device through the bypass line into the feed pump, in particular when the feed pump is not in operation.
  • This particular temperature change is in particular a rapid temperature change, which is due to the fact that water has flowed from the hot water supply device into the feed pump via the bypass line.
  • a self-learning device which provides control signals for operating the feed pump on the basis of a user pattern, which is determined via the sensor device and the evaluation device.
  • the evaluation device can provide data about a water tap. In principle, this data can be determined in a time-resolved manner.
  • the self-learning device can then determine a user pattern.
  • the feed pump can in turn be operated in such a way that there is optimized comfort for operating a domestic water system. For example, a recirculation is carried out for a certain period of time before an expected tap in order to "remove" excessively cooled water from a hot water pipe.
  • the self-learning device is coupled to the evaluation device.
  • the self-learning device and the evaluation device are arranged in the same microcontroller in which a motor circuit of an electric motor of the feed pump is also arranged.
  • the self-learning device comprises a timer which determines a point in time of a water tap and stores corresponding points in time, with control and / or setting and / or adaptation of an operation of the feed pump taking place according to stored points in time. This enables a time-resolved user pattern to be determined. This allows a time control for the operation of the feed pump to be carried out.
  • a process water system of the type mentioned in the introduction in which a pump device according to the invention is arranged on the recirculation line.
  • a method for operating a domestic water system of the type mentioned at the outset is also provided, a pump device according to the invention being arranged on the recirculation line.
  • a tap of water from the hot water pipe is detected while the feed pump is running by determining a flow of the conveying liquid through the feed pump, and a tap of water from the hot water pipe when the feed pump is at a standstill is detected from measured temperature changes at the feed pump.
  • a user pattern can be determined by the method according to the invention without an external sensor having to be provided.
  • the method according to the invention has the advantages already explained in connection with the pump device according to the invention.
  • temperature changes on the feed pump which are used for the detection of a draw-off of water from the hot water pipe and are measured in particular within the feed pump, are brought about by water which flows from the hot water supply device through the bypass pipe into the feed pump. When the feed pump is not operating, it can then be recognized whether water is being drawn off.
  • the feed pump is put into operation when temperature changes are detected when the feed pump is stopped. This makes it possible to verify, for example, by detecting a flow rate whether a tap has taken place.
  • a self-learning method of the type mentioned at the outset in which a user pattern relating to water tapping is determined using the method according to the invention for operating a domestic water system, and pump operation of the feed pump is controlled and / or set and / or adjusted based on the determined pattern.
  • a user pattern can be recognized in a safe and comfortable manner, which in turn can be used to control the operation of the domestic water system. This results in comfortable operation.
  • times of the water tap are stored during the pattern determination and a pumping operation is initiated at a time interval before a corresponding stored time and / or a pumping operation is ended at a time interval after a corresponding stored time. This results in comfortable operation.
  • a determined pattern has a finite lifespan and is deactivated for a certain period of time with regard to the operation of the feed pump, in particular after the pattern has not been used. This ensures that a rare user pattern is used too often.
  • An embodiment of a domestic water system according to the invention which in Figure 1 shown and schematically designated 10, comprises a hot water supply device 12. This has in particular a hot water tank 14, which stores warm water.
  • a boiler 16 is assigned to the hot water tank 14.
  • the hot water supply device 12 has a supply device 18 for fresh water (cold water), via which heatable fresh water can be supplied.
  • a hot water line 20 is connected to the hot water supply device 12, by means of which hot water can be removed from the hot water tank 14.
  • Tap points 22a, 22b, 22c are connected to the hot water line 20.
  • the taps include, for example, one or more taps and one or more shower heads. Hot water can be taken from them.
  • a recirculation line 24 is connected to the hot water line 20.
  • the recirculation line is a continuation of the hot water line 20 after the last tap 22c.
  • the recirculation line 24 leads to the hot water supply device 12 and is connected to the hot water tank 14.
  • Warm water can be circulated between a first connection 26 and a second connection 28 of the hot water supply device 12 via the recirculation line 24 when tapping points 22a etc. are not being tapped.
  • the hot water line 20 is connected to the hot water supply device 12 via the first connection 26.
  • the recirculation line 24 is connected to the hot water supply device 12 via the second connection 28.
  • a pump device 30 is provided to convey hot water in the recirculation line 24. This pump device 30 is arranged on the recirculation line 24. Pumped liquid 30, namely warm water, is conveyed between the first connection 26 and the second connection 28 by means of the pump device 30.
  • the pump device 30 comprises a feed pump 116.
  • the pump device 30 also has a check valve 32 and a bypass line 34.
  • the bypass line 34 is arranged parallel to the check valve 32.
  • the check valve can be "bridged", ie bypassed, via them.
  • the bypass line 34 can be composed of one line section or of several line sections.
  • the bypass line 34 and the check valve 32 form a combination 36.
  • This combination 36 is arranged in series with the feed pump 116.
  • the pump device 30 comprises a first connection 38 and a second connection 40.
  • the combination 36 is directly fluidly connected to the hot water supply device 12 via the first connection 38 and is fluidly connected to the second connection 28 thereof.
  • the feed pump 116 is connected to the recirculation line 24 via the second connection 40.
  • conveying liquid (water) flows from the second connection 40 to the first connection 38 into the hot water tank 14.
  • feed pump 116 (circulation pump) is, for example, from the DE 10 2007 054 313 A1 or the US 2009/0121034 known. Reference is expressly made to these documents in full.
  • the pump 116 ( Figure 2 ) comprises an electric motor 120 with a stator 122 and a rotor 124.
  • the electric motor 120 has a motor housing 126, in which the stator 122 and the rotor 124 are arranged.
  • the electric motor 120 also has a motor circuit 128.
  • the motor circuit 128 is arranged in a circuit housing 130.
  • the circuit housing 130 can, as in FIG Figure 2 shown, be separate from the motor housing 126 or be formed by means of the motor housing 126.
  • the rotor 124 is supported via a bearing shell 132 on a convex bearing body 134, which is designed in particular as a bearing ball, for example made of a ceramic material.
  • a spherical bearing is formed over the bearing body 134 and the bearing shell 132.
  • An impeller 136 is rotatably connected to the rotor 124.
  • the impeller 136 rotates about a rotation axis 138 in a delivery chamber 140.
  • the delivery chamber 140 can be flowed through by the conveying liquid, the flow being driven by the impeller 136 in pump operation.
  • the feed pump 116 includes a temperature sensor 142.
  • the temperature sensor 142 is arranged and designed such that it can be used to determine a temperature of the conveyed liquid in the conveying space 140.
  • the temperature sensor 142 is preferably located outside the delivery chamber 140. As a result, the temperature sensor 142 can be of simpler design since it is not exposed to liquid.
  • the conveying space 140 is delimited by a wall 144.
  • the temperature sensor 142 is located on the wall 144 outside the delivery space 140. It is seated, for example, directly on an outside of the wall 144 or at a small distance from this outside. In particular, it is in thermal contact with the wall 144.
  • the temperature sensor sits on the motor housing 126 and is in thermal contact with the delivery chamber 140.
  • the pump device 30 has an evaluation device 42, which is integrated in particular into the feed pump 116.
  • the temperature sensor 142 or 146 makes its temperature signals available to the evaluation device 148.
  • the evaluation device 42 is integrated in the motor circuit 128, for example.
  • the feed pump 116 has a housing 150.
  • the housing 150 is in particular thermally insulated.
  • the impeller 36 is arranged within the housing 150.
  • the electric motor 20 is at least partially arranged within the housing 150.
  • the temperature sensor 142 or 146 is arranged within the housing 150.
  • the housing 150 has a pump housing 151 as the first housing part and the motor housing 126 as the second housing part.
  • the motor housing 126 is seated on the pump housing 151.
  • the impeller 136 is positioned in the pump housing 151.
  • the temperature sensor 142 is located in the housing 150 and in particular in the motor housing 126 or, for example, on the outside of the pump housing 151.
  • the temperature sensor 146 is also located in the motor housing 126.
  • the temperature sensor 146 is used for easy removal of the electric motor 120 from the pump housing 151. In this case, no cable connections for the temperature sensor need to run in the pump housing 151.
  • the temperature sensor (for example the temperature sensor 142) is assigned a temperature control device.
  • the temperature control device ensures that there are defined temperature conditions in an environment of the temperature sensor 142. As a result, changes in temperature over time can be directly associated with temperature changes in the conveyed liquid in the conveying space 140.
  • the temperature control device comprises a temperature control chamber.
  • This has a housing in particular made of a thermally insulating material.
  • the temperature sensor 142 (or 146) is then arranged in the housing and is in thermal contact with the delivery chamber 140.
  • it is arranged directly on the wall 144 or it is a thermal conduction connection between the wall 144 and the temperature sensor 142 or 146 and provided the housing.
  • the temperature control device comprises at least one heating element and in particular resistance heating element, which is arranged in the temperature control chamber.
  • a defined temperature can be set in the temperature control chamber and thus in the vicinity of the temperature sensor 142 or 146 by appropriate electrical application of the heating element.
  • the evaluation device 42 is on a carrier 44 ( Figure 7 ) arranged.
  • the carrier 44 is positioned in particular in the circuit housing 130.
  • the motor circuit 128, which controls the electric motor 120, is arranged on the same carrier 44 or on a carrier connected to the carrier 44.
  • the temperature sensor 142, 146 is connected in a signal-effective manner to the evaluation device 42, that is to say the corresponding temperature signals are made available to the evaluation device 42, which monitors the temperature signals.
  • a sensor device is formed via the temperature sensor 142 or the temperature sensor 146 (possibly in combination with the temperature control device), via which a water tap on the hot water line 20 can be detected when the feed pump 116 is stopped.
  • a sensor device 46 is also provided ( Figure 7 ), which determines the speed n of the rotor 124 of the electric motor 120 and / or determines the power consumption P of the electric motor 120. This is explained in more detail below.
  • the sensor device 46 is integrated in particular in the electric motor 120 and, for example, integrated in the motor circuit 128.
  • the sensor device 46 is also connected to the evaluation device 42 in a signal-effective manner.
  • a self-learning device 48 is also positioned on the carrier 44.
  • the evaluation device 42 evaluates corresponding sensor data of the sensor device 46 and the temperature sensor 142 or 146.
  • the self-learning device 48 can generate a user pattern for the use of hot water from the corresponding evaluated data, which is recorded in particular as a function of time.
  • the self-learning device 48 includes a Timer 50, by means of which the times of the hot water tap on the hot water line 20 can be determined.
  • the self-learning device 48 in turn generates data for the motor circuit 128 for controlling the electric motor 120 and thus the feed pump 116.
  • the self-learning device 48 can be integrated in the motor circuit 128.
  • a microcontroller of the motor circuit 128 also includes the evaluation device 42 and the self-learning device 48.
  • the bypass line preferably has a hydraulic cross section which is smaller than the hydraulic cross section of recirculation line 24.
  • the hydraulic cross section of bypass line 34 is in the range between 5% and 15% of the hydraulic cross section of recirculation line 24. In one exemplary embodiment the hydraulic cross section of the bypass line 34 is approximately 10% of the hydraulic cross section of the recirculation line 24.
  • the cross-section of the bypass line 34 is selected such that it is sufficiently large that there is no blockage due to limescale or dirt particles and, on the other hand, is selected so small that the amount of water flowing through the bypass line 34 to a tap is so small that the Water temperature at the tap is not noticeably affected. (The corresponding backflow of water can possibly consist of cold water.)
  • the check valve 32 is arranged and designed such that the feed pump 116 is protected against a backflow of water (hot water) from the hot water supply device 12 and water from the Water tank 14 can mix on the recirculation line 24 with water from the hot water line 20.
  • bypass line 34 allows a certain amount of backflow for measurement reasons, as will be explained in more detail below.
  • this backflow is limited by the correspondingly small hydraulic diameter of the bypass line 34 and is kept “small”.
  • bypass line 34 limits the backflow for a throughput of conveyed liquid, which is at most 15% of a throughput of conveyed liquid through the pump device 30 in normal recirculation operation when conveyed liquid is conveyed from the second connection 40 to the first connection 38.
  • the pump device 30 conveys a certain amount of hot water through the hot water line 20 and the recirculation line 24. Hot water is circulated from the hot water supply device 12 through the hot water line 20, the recirculation line 24 leading to the hot water tank 14 leads, closes the funding group.
  • the feed pump 116 provides water delivery. This "normal operation” is in Figure 3 shown. In this normal operation, the check valve 32 is open (in Figure 3 indicated by "O"). A direction of flow of hot water is indicated by double arrows.
  • the recirculation of hot water can take place continuously during times in which hot water is expected to be drawn off, or it can, for example, be clocked.
  • the recirculation of hot water through the hot water line 20 and the recirculation line 24 can take place in particular in dependence on a specific user pattern in order to achieve an energy-saving operation enable. For example, there is no need for hot water circulation in longer periods of rest.
  • the user pattern can in turn be determined via the evaluation device 42 and the self-learning device 48 can be used to provide the motor circuit 128 with corresponding data for controlling and / or setting and / or adapting the operation of the feed pump 116.
  • the dynamic pressure at the feed pump 116 is 1 m in relation to a delivery head.
  • the static pressure in the domestic water system 10 is of the order of magnitude in relation to a delivery head in the range between 30 m and 50 m, so that the check valve 32 closes in a safe manner by tapping water on the hot water line 20.
  • elements of the pump device 30 can be used to detect a water tap on the hot water line 20, both when the feed pump 116 is in operation and when the feed pump 116 is not in operation.
  • the flow rate Q is proportional to the third root of a motor power P of the electric motor 120; the motor power P is the power consumption of the electric motor 120.
  • the flow rate Q is also proportional to the speed n of the electric motor 120, that is to say the speed n of the impeller 136 of the feed pump 116, which in turn corresponds to the speed of the rotor 124 of the electric motor 120.
  • the measurable engine power P can then be used to determine the flow rate Q.
  • the pump curve is given by a linear relationship ( Figure 5 ).
  • the corresponding relationship is determined once and stored in a memory of the evaluation device 42.
  • Corresponding calibration data are thus provided, which are stored in the delivery pump 116 at the factory.
  • engine power P is determined by sensor device 46. It will then be in the in the Evaluation device 42 "looked up" stored table and thus concluded on the current (current) flow rate Q.
  • the evaluation device 42 receives data from the sensor device 46 and monitors it.
  • the evaluation device 42 monitors in particular the absolute value of the flow rate or checks whether there is a change in the flow rate Q, in particular above a threshold. A corresponding significant change then means a tap on the hot water line 20.
  • the method just described can be used to determine whether (and with the help of the timer 50 when) water is being drawn from the hot water line 20 if the feed pump 116 is in operation, that is to say based on the “recirculation state” Figure 3 ,
  • Figure 5 schematically shows a pump curve for the feed pump 116, which indicates a delivery head H as a function of the flow rate Q.
  • a constant speed n is assumed.
  • the power consumption P (motor power) is also shown.
  • the corresponding data apply to a high-efficiency pump.
  • the power consumption P increases with increasing delivery quantity Q (curve 52).
  • two points are drawn schematically; the point B corresponds to a state in which the check valve 32 is open.
  • Point A corresponds to a low flow rate condition in which the check valve 32 is closed. It should be noted that it can be assumed that when hot water is drawn from the hot water pipe 20 running feed pump 116 this will usually no longer have a positive throughput, but a small negative throughput.
  • the water supply usually provides a pressure which is 30 to 50 times higher than the differential pressure of the feed pump 116. It can therefore be assumed that at point A the power consumption P is actually lower than in Figure 5 indicated.
  • the relationship between the power consumption and the delivery rate (flow rate) can be seen, and a tap on the hot water line 20 can be recognized via the delivery pump 116 (via the evaluation device 42 and the sensor device 46) while the delivery pump 116 is running.
  • Feed pumps 116 are usually operated in a circulation system in a speed-controlled manner since the power range is relatively low.
  • FIG 6 schematically shows a possible time profile of the temperature T, which is measured, for example, on the sensor 142.
  • the curve 54 according to Figure 6 corresponds to a temperature profile when the feed pump 116 is in operation.
  • the feed pump sucks hot water from the hot water tank 14 into the hot water pipe 20, which is thereby heated. Your circulation line 24 is also heated.
  • the water reaching the feed pump 116 becomes warmer with increasing time until the entire line (hot water line 20, recirculation line 24) is warm and the temperature no longer rises.
  • the feed pump 116 is thus flowed through by water, since it had previously delivered itself in the opposite direction.
  • An inverted profile 56 then arises for the temperature profile, the slope generally being flatter than in curve 54.
  • This water then flows out of the hot water tank 14 through the bypass line 34 in the feed pump 116.
  • the temperature and also the temperature changes depend on the position of a circulation input and in particular also on the state of charge of a boiler of the hot water supply device 12. If, for example, a shower has just been taken extensively, then it may be the case that a lower region of the hot water tank 14 is cold and first has to be warmed up again. If the hot water tank 14 is fully charged, then warm water can be provided from it again.
  • the temperature sensor 142, 146 supplies its data to the evaluation device 42, which determines the corresponding temporal temperature profile.
  • a strong temperature change is detected by the evaluation device 42, in particular according to curves 58 or 60, then this is an indication that a water tap has taken place or has taken place. It can then be recognized accordingly by monitoring temperature changes by the evaluation device 42 whether water has been drawn off. This water tap can also be detected when the feed pump 116 is not in operation.
  • the lower temperature change 56 compared to the temperature changes 58, 60 can also be detected.
  • a temperature profile according to profile 56 is an indication of a tap.
  • a water supply is thus recognized by means of "on-board means" of the feed pump 116 when the feed pump 116 is in operation and when it is not in operation.
  • the water tap is recognized in particular by a change in the flow rate Q.
  • water tapping is detected due to a possible backflow of water from the hot water tank 14 through the bypass line 34 into the feed pump 116 due to relatively large temperature changes.
  • the pump device 30 with the integrated sensor device with the temperature sensor 142, 146 and the sensor device 46 can then be used to determine whether a water tap is present or not, regardless of the operating state of the feed pump 16. No sensors outside the pump device 30 are required for this. In particular, no temperature sensor is required on the hot water supply device 12. This eliminates the otherwise required cabling and wiring.
  • the evaluation device 42 can therefore detect when there is a water tap on the hot water line 20, regardless of the operating state of the feed pump 116.
  • the timing element 50 can then be used to determine when such a water tap is present.
  • the self-learning device 48 can thereby determine a user pattern which is a time dependency of the water tap.
  • the user pattern determined in this way can in turn be used to control, adjust or adapt the operation of the feed pump 116.
  • the determined user pattern is used in such a way that the feed pump is operated in particular at a certain time interval (such as 15 minutes) before an expected tapping time in order to carry out a recirculation. If a user then carries out a tap, then he constantly receives warm water, that is to say there is no cooled water in the hot water line 20.
  • the operation of the feed pump 116 can be switched off after a certain period of time (such as 15 minutes) after an expected tapping interval, since no more recirculation is required.
  • the self-learning device 48 generates control data for the motor circuit 128 from the user pattern in order to control, adjust or adapt the feed pump 116 in a time-controlled manner.
  • the self-learning device 48 provides, for example, a control algorithm which has a 24-hour pattern and a superimposed 7-day pattern. As a result, a user pattern can be determined over the entire course of the week and used in accordance with this determined user pattern for controlling / setting / adapting the feed pump 116.
  • a self-learning device 48 assigns a finite lifetime to a user pattern. If no use of this user pattern is detected, then this user pattern is deactivated with regard to the control / setting / adaptation of the feed pump 116. If, for example, the user pattern is not used for three cycles, such deactivation takes place. For example, if the user pattern is used again within three days, it is reactivated. For example, the lifespan is extended to a maximum of 30 days, for example.
  • the corresponding lifespan control can also be used for the seven-day pattern.
  • user patterns can be different for each day and, for example, regular patterns for five days of the week may appear after some time, with days six and seven following other user patterns.
  • cycle lifetimes and the length of operations of the feed pump 116 can be selected in order to be able to vary a "comfort factor".
  • the longer life cycles and the longer a pump is in operation the less hot water is conveyed into the hot water pipe 20 without recirculation; however, the energy consumption is also higher.
  • the feed pump 116 is started as soon as a temperature change according to curve 58 or 60 is detected, which is due to the backflow of water into the feed pump 116.
  • a temperature change according to profile 56 can also be detected and is a sign of a tap. It can then be verified that actually (after detection of a finite Flow rate in pump operation) water from the hot water tank 14 has reached the feed pump 116 directly via the second connection 28.
  • the feed pump 116 can also be operated until the tap is stopped to determine the length of the hot water tap.
  • the self-learning device 48 can take the results obtained thereby into account in the user pattern.
  • the thermally insulated housing 150 enables a defined detection of the strong temperature changes (curves 58 or 60) due to the backflow of hot water from the hot water tank 14 via the second connection 28 into the feed pump 116.
  • the solution according to the invention enables a self-learning method to be implemented in which a user pattern can be detected by means of the pump device 30.
  • the user pattern can be detected regardless of whether the feed pump 116 is in operation or not.
  • a comfortable and energy-saving mode of operation results.
  • a user pattern can be detected and then also used without external sensors being provided with respect to the pump device 30.

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Description

Die Erfindung betrifft eine Pumpenvorrichtung zur Anordnung an einer Rezirkulationsleitung eines Brauchwassersystems.The invention relates to a pump device for arrangement on a recirculation line of a domestic water system.

Die Erfindung betrifft ferner ein Brauchwassersystem, umfassend eine Warmwasserbereitstellungseinrichtung, eine Warmwasserleitung, welche an die Warmwasserbereitstellungseinrichtung angeschlossen ist und an welcher mindestens eine Zapfstelle angeordnet ist, und eine Rezirkulationsleitung, welche an die Warmwasserleitung angeschlossen ist und zu der Warmwasserbereitstellungseinrichtung führt.The invention further relates to a domestic hot water system, comprising a hot water supply device, a hot water line which is connected to the hot water supply device and at which at least one tap is arranged, and a recirculation line which is connected to the hot water line and leads to the hot water supply device.

Die Erfindung betrifft ferner ein Verfahren zum Betreiben eines Brauchwassersystems, umfassend eine Warmwasserbereitstellungseinrichtung, eine Warmwasserleitung mit mindestens einer Zapfstelle, und eine Rezirkulationsleitung.The invention further relates to a method for operating a domestic water system, comprising a hot water supply device, a hot water line with at least one tap, and a recirculation line.

Die Erfindung betrifft ferner ein Selbstlernverfahren für eine Förderpumpe eines Brauchwassersystems.The invention further relates to a self-learning method for a feed pump of a domestic water system.

Aus der DE 10 2006 054 729 B3 ist eine Zirkulationssteuerung bekannt, welche einen Sensor zur Erkennung von Warmwasser-Zapfvorgängen und daraufhin auslösenden Starts einer Zirkulationspumpe auf Anforderung umfasst. Es ist ein Mikrocontroller oder Mikrorechner zur Signalverarbeitung und Ansteuerung der Zirkulationspumpe vorgesehen. Es sind ein zyklisch umlaufender Gewohnheiten-Speicher und auslösende Starts der Zirkulationspumpe bei Überschreiten eines Schwellenwerts durch die gespeicherte Bedarfswahrscheinlichkeit vorgesehen. Der Speicherwert des jeweils aktuell gültigen Tageszeit-Intervalls ist die Ausgangsgröße einer Tiefpass-Funktion, deren Eingangsgröße aus den zyklisch abgetasteten Prüfergebnissen von Zapfvorgängen im betreffenden Intervall gebildet wird und deren Zeitkonstante variabel und prinzipiell unterschiedlich für erkannte oder nicht erkannte Zapfvorgänge ist. Erkannte Zapfvorgänge werden in einem weiteren Speicher mit zyklischer Struktur zwischengespeichert und erst während der nächsten Tages-Periode zur Präzisierung der Inhalte des Gewohnheiten-Speichers verarbeitet. Sofern der Sensor zur Erkennung von Zapfvorgängen ein Temperatursensor ist, wird immer dann, wenn das Steigrohr bereits erwärmt ist, dessen Abkühlungsgeschwindigkeit mit einem Referenzwert verglichen, um unter dieser Bedingung einen Zapfvorgang zu erkennen.From the DE 10 2006 054 729 B3 A circulation control is known which comprises a sensor for the detection of hot water dispensing processes and subsequent triggering of a circulation pump upon request. A microcontroller or microcomputer is provided for signal processing and control of the circulation pump. A cyclically circulating habits memory and triggering starts of the circulation pump when a threshold value is exceeded due to the stored probability of need. The stored value of the currently valid time of day interval is the output variable of a low-pass function, the input variable of which is formed from the cyclically sampled test results of tapping operations in the relevant interval and their Time constant is variable and in principle different for recognized or unrecognized dispensing processes. Detected tapping processes are temporarily stored in a further memory with a cyclical structure and are only processed during the next day period to specify the contents of the habits memory. If the sensor for the detection of dispensing processes is a temperature sensor, whenever the riser pipe is already heated, its cooling rate is compared with a reference value in order to detect a dispensing process under this condition.

Aus der DE 10 2007 007 414 B3 ist ein Zirkulationsapparat bekannt.From the DE 10 2007 007 414 B3 a circulation apparatus is known.

Aus der DE 20 2012 010 328 U1 ist eine Rohrbegleitheizungs-Steuerung für die zentrale Warmwasserversorgung in Gebäuden bekannt, welche wenigstens einen Sensor zum Erkennen von Warmwasser-Zapfvorgängen aufweist.From the DE 20 2012 010 328 U1 a pipe trace heating control for the central hot water supply in buildings is known, which has at least one sensor for detecting hot water dispensing processes.

Aus der DE 101 28 444 B4 sind eine Anordnung und ein Verfahren zur bedarfsabhängigen automatischen Steuerung von Warmwasser-Zirkulationspumpen bekannt.From the DE 101 28 444 B4 An arrangement and a method for the demand-dependent automatic control of hot water circulation pumps are known.

Aus der DE 101 06 106 A1 ist eine Anordnung und ein Verfahren zur bedarfsweisen Aktivierung eines Warmwasserkreislaufes bekannt.From the DE 101 06 106 A1 An arrangement and a method for activating a hot water circuit as required is known.

Aus der DE 10 2007 054 313 A1 ist eine Umwälzpumpe für eine Förderflüssigkeit bekannt, umfassend einen Elektromotor, welcher elektronisch kommutiert ist, mit einem Rotor, einem Stator und einer Motorschaltung, und einem Schaufelrad, welches drehfest mit dem Rotor verbunden ist. Der Elektromotor weist eine Auswertungseinrichtung auf, durch welche über eine Drehzahl des Rotors und/oder eine Leistungsaufnahme des Elektromotors eine Durchströmungsmenge an Förderflüssigkeit durch die Umwälzpumpe bestimmbar ist. Es ist mindestens ein Signalausgang vorgesehen, an welchem durch die Umwälzpumpe ein Durchströmungsmengen-Signal und/oder Durchströmungsmengen-abhängiges Schaltsignal bereitstellbar ist.From the DE 10 2007 054 313 A1 A circulating pump for a conveying liquid is known, comprising an electric motor, which is electronically commutated, with a rotor, a stator and a motor circuit, and a paddle wheel, which is non-rotatably connected to the rotor. The electric motor has an evaluation device, by means of which a flow rate of conveyed liquid through the circulation pump can be determined via a speed of the rotor and / or a power consumption of the electric motor. At least one signal output is provided, at which a flow rate signal and / or flow rate-dependent switching signal can be provided by the circulation pump.

Aus der DE 10 2013 109 134 A1 ist ein Verfahren zur Bestimmung einer Durchströmungsmenge an einem Flüssigkeitssystem bekannt.From the DE 10 2013 109 134 A1 a method for determining a flow rate in a liquid system is known.

Weitere Brauchwassersysteme sind aus der DE 299 00 274 U1 und US 5 143 049 A bekannt und aus der FR 2 398 976 A1 ist eine Bypassleitung für ein Thermoventil bekannt.Other process water systems are from the DE 299 00 274 U1 and US 5 143 049 A known and from the FR 2 398 976 A1 a bypass line for a thermal valve is known.

Der Erfindung liegt die Aufgabe zugrunde, eine Pumpenvorrichtung der eingangs genannten Art bereitzustellen, mit welcher sich auf einfache und komfortable Weise ein Brauchwassersystem betreiben lässt.The invention has for its object to provide a pump device of the type mentioned, with which a domestic water system can be operated in a simple and convenient manner.

Diese Aufgabe wird durch die Pumpenvorrichtung gemäß Anspruch 1 und das Verfahren zum Betrieben eines Brauchwassersystems gemäß Anspruch 20 gelöst. Erfindungsgemäß ist eine Förderpumpe, ein Rückschlagventil, und eine Bypassleitung für das Rückschlagventil vorgesehen, wobei die Bypassleitung parallel zu dem Rückschlagventil angeordnet ist, und wobei eine Kombination aus Rückschlagventil und Bypassleitung in Serie zu der Förderpumpe angeordnet ist.This object is achieved by the pump device according to claim 1 and the method for operating a domestic water system according to claim 20. According to the invention, a feed pump, a check valve, and a bypass line for the check valve are provided, the bypass line being arranged parallel to the check valve, and a combination of check valve and bypass line being arranged in series with the feed pump.

Durch die Förderpumpe lässt sich in einem Rezirkulationsvorgang warmes Wasser zirkulieren. Das Rückschlagventil verhindert bei einer Wasserzapfung, dass warmes Wasser aus einer Warmwasserbereitstellungseinrichtung mit hoher Geschwindigkeit entgegen einer Förderrichtung der Förderpumpe durch die Förderpumpe strömen kann.Warm water can be circulated in a recirculation process using the feed pump. The check valve prevents water from flowing out of a hot water supply device at high speed against a delivery direction of the feed pump through the feed pump.

Die Bypassleitung sorgt dafür, dass dennoch eine geringe Menge an warmem Wasser in die Förderpumpe rückströmen kann. Dies kann zu einer Temperaturänderung und insbesondere relativ steilen Temperaturänderung führen, welche detektierbar ist. Diese Temperaturänderung ist ein Anzeichen für eine Wasserzapfung.The bypass line ensures that a small amount of warm water can still flow back into the feed pump. This can lead to a temperature change and, in particular, a relatively steep temperature change, which is detectable. This change in temperature is an indication of water being drawn off.

Mit der erfindungsgemäßen Pumpenvorrichtung lässt sich über "Bordmittel" der Pumpenvorrichtung eine Wasserzapfung an dem Brauchwassersystem detektieren, unabhängig davon, ob die Förderpumpe in Betrieb ist oder nicht. Durch die erfindungsgemäße Pumpenvorrichtung lässt sich dann ein Benutzermuster ermitteln, welches wiederum in einem Selbstlernvorgang zur Steuerung/Einstellung/Anpassung des Betriebs der Förderpumpe verwendet werden kann. Dadurch lässt sich entsprechend das Brauchwassersystem komfortabel betreiben. Mit einem gelernten Benutzermuster lässt sich eine signifikante Abkühlung von Warmwasser in einer Warmwasserleitung des Brauchwassersystems über Rezirkulation in Zeiten, in denen gewöhnlich Warmwasser gezapft wird, verhindern.With the pump device according to the invention, water tapping on the process water system can be detected via "on-board means" of the pump device, regardless of whether the feed pump is in operation or not. A user pattern can then be determined by the pump device according to the invention, which in turn can be used in a self-learning process for controlling / setting / adapting the operation of the feed pump. This allows the domestic water system to be set accordingly operate comfortably. With a learned user pattern, significant cooling of hot water in a hot water pipe of the domestic water system via recirculation can be prevented at times when hot water is usually drawn off.

Für einen solchen Selbstlernvorgang muss außerhalb der Pumpenvorrichtung und insbesondere außerhalb der Förderpumpe kein zusätzlicher Sensor vorgesehen werden. Es entfällt dadurch der entsprechende Verkabelungsaufwand und auch der Einkopplungsaufwand von Signalen.For such a self-learning process, no additional sensor has to be provided outside the pump device and in particular outside the feed pump. This eliminates the corresponding wiring effort and also the coupling effort of signals.

Erfindungsgemäß weist die Pumpenvorrichtung einen ersten Anschluss auf, welcher (direkt) fluidwirksam mit der Kombination aus Rückschlagventil und Bypassleitung verbunden ist, und welcher zum Anschluss der Pumpenvorrichtung an eine Warmwasserbereitstellungseinrichtung dient. Insbesondere wird bei einem Rückflussvorgang Wasser aus der Warmwasserbereitstellungseinrichtung über den ersten Anschluss in die Pumpenvorrichtung eingekoppelt. Die Pumpenvorrichtung weist ferner einen zweiten Anschluss auf, welcher mit der Förderpumpe (direkt) fluidwirksam verbunden ist, wobei Wasser als Förderflüssigkeit bei einem Betrieb der Förderpumpe die Pumpenvorrichtung von dem zweiten Anschluss zu dem ersten Anschluss durchströmt. In einem "Rezirkulationsbetrieb" der Förderpumpe fördert diese Wasser aus der Rezirkulationsleitung, welche an den zweiten Anschluss angeschlossen ist, in die Warmwasserbereitstellungseinrichtung, welche an den ersten Anschluss angeschlossen ist.According to the invention, the pump device has a first connection, which is (directly) fluidly connected to the combination of check valve and bypass line, and which serves to connect the pump device to a hot water supply device. In particular, in the case of a reflux process, water from the hot water supply device is coupled into the pump device via the first connection. The pump device also has a second connection, which is (directly) connected to the feed pump in a fluid-effective manner, water as the feed liquid flowing through the pump device from the second connection to the first connection when the feed pump is operating. In a "recirculation mode" of the feed pump, this conveys water from the recirculation line, which is connected to the second connection, into the hot water supply device, which is connected to the first connection.

Günstig ist es, wenn das Rückschlagventil so angeordnet und ausgebildet ist, dass es bei Wasserzapfung an einer Warmwasserleitung, an welcher die Rezirkulationsleitung angeordnet ist, schließt. Dadurch wird eine "umfangreiche" Vermischung von Wasser aus der Warmwasserbereitstellungseinrichtung und Wasser aus der Rezirkulationseinrichtung verhindert. Wasser aus der Warmwasserbereitstellungseinrichtung kann dann nicht entgegen der Förderrichtung der Förderpumpe mit hoher Geschwindigkeit durch diese strömen. Üblicherweise reicht der Druck bei der Warmwasserbereitstellung im Vergleich zu der Druckdifferenz der Fördereinrichtung aus, um das Rückschlagventil zu schließen. Das Rückschlagventil sorgt vorteilhafterweise sowohl bei einem Pumpbetrieb als auch bei Stillstand der Förderpumpe für ein Schließen.It is expedient if the check valve is arranged and designed such that when water is drawn off it closes on a hot water line on which the recirculation line is arranged. This prevents "extensive" mixing of water from the hot water supply device and water from the recirculation device. Water from the hot water supply device can then not through the delivery pump at high speed through this stream. The pressure in the provision of hot water in comparison to the pressure difference of the delivery device is usually sufficient to close the check valve. The check valve advantageously ensures a closure both when the pump is operating and when the feed pump is at a standstill.

Es ist dann günstig, wenn die Bypassleitung so angeordnet und ausgebildet ist, dass ein Durchsatz von Förderflüssigkeit durch sie erfolgt, welcher höchstens 15 % eines Durchsatzes von Förderflüssigkeit durch die Pumpenvorrichtung beträgt, wenn das Rückschlagventil offen ist und die Förderpumpe in Betrieb ist. Dadurch ist die "Störung" durch die offene Bypassleitung gering.It is then advantageous if the bypass line is arranged and designed such that a throughput of delivery liquid takes place through it, which is at most 15% of a throughput of delivery liquid through the pump device, when the check valve is open and the delivery pump is in operation. As a result, the "malfunction" caused by the open bypass line is low.

Es ist insbesondere günstig, wenn die Bypassleitung eine hydraulische Querschnittsfläche aufweist, welche im Bereich zwischen 5 % und 15 % einer hydraulischen Querschnittsfläche der Rezirkulationsleitung liegt, an welcher die Pumpenvorrichtung angeordnet ist. Durch die Grenze nach unten lässt sich zum einen verhindern, dass über eine normale Betriebsdauer genommen Kalkablagerungen beziehungsweise Ablagerungen von Schmutzpartikeln die Bypassleitung zusetzen, und zum anderen wird durch die obere Grenze sichergestellt, dass der Einfluss der Bypassleitung auf den normalen Rezirkulationsbetrieb minimiert ist.It is particularly favorable if the bypass line has a hydraulic cross-sectional area which lies in the range between 5% and 15% of a hydraulic cross-sectional area of the recirculation line on which the pump device is arranged. The lower limit can be used to prevent lime deposits or deposits of dirt particles from clogging the bypass line over a normal operating period.On the other hand, the upper limit ensures that the influence of the bypass line on normal recirculation operation is minimized.

Ganz besonders vorteilhaft ist es, wenn die Pumpenvorrichtung eine Sensoreinrichtung und eine Auswertungseinrichtung, welche signalwirksam mit der Sensoreinrichtung verbunden ist, umfasst, durch welche detektierbar ist, wenn Wasser aus einer Warmwasserleitung, an welche die Rezirkulationsleitung angeschlossen ist, gezapft wird. Es lässt sich dann mittels der Auswertungseinrichtung erkennen, wenn solche Zapfvorgänge vorliegen. Daraus wiederum lässt sich ein Benutzermuster in seiner zeitlichen Abhängigkeit ermitteln.It is particularly advantageous if the pump device comprises a sensor device and an evaluation device, which is connected to the sensor device in a signal-effective manner, by means of which it can be detected when water is drawn from a hot water line to which the recirculation line is connected. It can then be recognized by means of the evaluation device when such dispensing processes are present. From this in turn, a user pattern can be determined in terms of its time dependency.

Es ist vorteilhaft, wenn die Sensoreinrichtung in die Förderpumpe integriert ist und insbesondere innerhalb eines Gehäuses der Förderpumpe angeordnet ist. Dadurch ergibt sich ein minimaler Schaltungsaufwand und es müssen keine Leitungen an dem Brauchwassersystem für eine Sensoreinrichtung geführt werden.It is advantageous if the sensor device is integrated in the feed pump and in particular is arranged within a housing of the feed pump. This results in a minimal amount of circuitry and there is no need for it Lines are routed to the domestic water system for a sensor device.

Aus den gleichen Gründen ist es günstig, wenn die Auswertungseinrichtung in die Förderpumpe integriert ist und insbesondere innerhalb eines Gehäuses der Förderpumpe angeordnet ist, und dabei insbesondere an einem Träger angeordnet ist, welcher ein Träger für eine Motorschaltung eines Elektromotors der Förderpumpe ist oder mit solch einem Träger verbunden ist. Dadurch ergibt sich eine optimierte Integration. Insbesondere ist die Auswertungseinrichtung Teil der Motorschaltung beziehungsweise identisch mit dieser.For the same reasons, it is favorable if the evaluation device is integrated in the feed pump and is in particular arranged within a housing of the feed pump, and in particular is arranged on a carrier which is a carrier for a motor circuit of an electric motor of the feed pump or with such a Carrier is connected. This results in an optimized integration. In particular, the evaluation device is part of the motor circuit or is identical to it.

Günstig ist es, wenn die Sensoreinrichtung so angeordnet und ausgebildet ist, und die Auswertungseinrichtung so ausgebildet ist, dass die Wasserzapfung sowohl bei laufender Förderpumpe als auch bei stehender Förderpumpe detektierbar ist. Dadurch lässt sich auf sichere Weise ein Benutzermuster ermitteln. Dadurch wiederum lässt sich ein sicherer und komfortabler Betrieb erreichen.It is expedient if the sensor device is arranged and designed and the evaluation device is designed such that the water tap can be detected both when the feed pump is running and when the feed pump is stopped. This allows a user pattern to be determined in a safe manner. This in turn enables safe and convenient operation.

Insbesondere ist die Sensoreinrichtung so angeordnet und ausgebildet und die Auswertungseinrichtung ist so ausgebildet, dass bei laufender Förderpumpe aus einer Änderung der Durchflussmenge an Förderflüssigkeit durch die Förderpumpe und/oder aus der absoluten Durchflussmenge die Wasserzapfung detektierbar ist. Eine Durchflussmenge und insbesondere Änderung der Durchflussmenge lässt sich auf einfache Weise ermitteln. Es lässt sich dadurch auf einfache Weise beim Betrieb der Förderpumpe eine Wasserzapfung erkennen.In particular, the sensor device is arranged and designed and the evaluation device is designed such that, when the feed pump is running, a change in the flow rate of feed liquid through the feed pump and / or from the absolute flow rate can detect the water tapping. A flow rate and in particular a change in the flow rate can be determined in a simple manner. This makes it easy to identify a water tap when the feed pump is operating.

Insbesondere umfasst die Sensoreinrichtung einen Sensor zur Ermittlung einer Drehzahl eines Rotors eines Elektromotors der Förderpumpe und/oder einen Sensor zur Ermittlung einer Leistungsaufnahme des Elektromotors, und die Auswertungseinrichtung ermittelt die Durchflussmenge aus Drehzahl und Leistungsaufnahme des Elektromotors. Beispielsweise wird die Drehzahl vorgegeben und die Leistungsaufnahme gemessen beziehungsweise die Leistungsaufnahme wird vorgegeben und die Drehzahl gemessen. Aufgrund der bekannten Abhängigkeit der Durchflussmenge von Drehzahl und Leistung lässt sich dann diese bestimmen. Insbesondere lässt sich leicht eine Änderung bestimmen. Die Auswertungseinrichtung überwacht dabei insbesondere ständig die Durchflussmenge, um so auch zeitlich eine Zapfung erkennen zu können.In particular, the sensor device comprises a sensor for determining a speed of a rotor of an electric motor of the feed pump and / or a sensor for determining a power consumption of the electric motor, and the evaluation device determines the flow rate from the speed and power consumption of the electric motor. For example, the speed is specified and the power consumption is measured or the Power consumption is specified and the speed is measured. This can then be determined on the basis of the known dependence of the flow rate on speed and power. In particular, a change can easily be determined. In particular, the evaluation device continuously monitors the flow rate in order to be able to recognize a tap in time.

Ganz besonders vorteilhaft ist es, wenn die Sensoreinrichtung mindestens einen Temperatursensor aufweist, welcher insbesondere innerhalb der Förderpumpe angeordnet ist. Über den Temperatursensor lassen sich starke Temperaturänderungen erkennen, welche auf einen Rückfluss von Wasser aus einer Warmwasserbereitstellungseinrichtung in die Förderpumpe zurückzuführen sind. Dadurch lässt sich eine Wasserzapfung erkennen, auch wenn die Förderpumpe nicht in Betrieb ist. Für diese Detektierbarkeit muss kein Sensor (wie ein Temperatursensor) außerhalb der Pumpenvorrichtung vorgesehen werden.It is particularly advantageous if the sensor device has at least one temperature sensor, which is arranged in particular within the feed pump. Strong temperature changes can be identified via the temperature sensor, which can be attributed to a backflow of water from a hot water supply device into the feed pump. This allows water to be drawn off even when the feed pump is not in operation. For this detectability, no sensor (such as a temperature sensor) has to be provided outside the pump device.

Insbesondere überwacht die Auswertungseinrichtung von dem mindestens einen Temperatursensor bereitgestellte Temperatursignale und stellt insbesondere bei einer (bestimmten) Temperaturänderung ein Detektionssignal bereit, welches einen Rückfluss von Wasser aus der Warmwasserbereitstellungseinrichtung durch die Bypassleitung in die Förderpumpe anzeigt, insbesondere wenn die Förderpumpe nicht in Betrieb ist. Diese bestimmte Temperaturänderung ist insbesondere eine schnelle Temperaturänderung, welche darauf zurückzuführen ist, dass Wasser aus der Warmwasserbereitstellungseinrichtung über die Bypassleitung in die Förderpumpe geströmt ist.In particular, the evaluation device monitors temperature signals provided by the at least one temperature sensor and, in particular in the event of a (specific) temperature change, provides a detection signal which indicates a backflow of water from the hot water supply device through the bypass line into the feed pump, in particular when the feed pump is not in operation. This particular temperature change is in particular a rapid temperature change, which is due to the fact that water has flowed from the hot water supply device into the feed pump via the bypass line.

Es kann vorgesehen sein, dass die Auswertungseinrichtung bei Erzeugen des Detektionssignals ein Anschaltsignal für die Förderpumpe generiert. Es lässt sich dadurch verifizieren, dass tatsächlich eine Wasserzapfung durchgeführt wurde, indem bei laufender Förderpumpe die Durchflussmenge ermittelt wird. Weiterhin kann auch die Förderpumpe so lange betrieben werden, bis keine Wasserzapfung mehr erfolgt, um so eine Zeitdauer einer Wasserzapfung zu ermitteln.Provision can be made for the evaluation device to generate an activation signal for the feed pump when the detection signal is generated. It can be verified that water was actually drawn by determining the flow rate while the feed pump is running. Furthermore, the feed pump can also be operated until none More water is drawn in order to determine the duration of a water tap.

Ganz besonders vorteilhaft ist es, wenn eine Selbstlerneinrichtung vorgesehen ist, welche aufgrund eines Benutzermusters, welches über die Sensoreinrichtung und die Auswertungseinrichtung ermittelt wird, Steuersignale für einen Betrieb der Förderpumpe bereitstellt. Die Auswertungseinrichtung kann Daten über eine Wasserzapfung bereitstellen. Grundsätzlich können diese Daten zeitaufgelöst ermittelt werden. Die Selbstlerneinrichtung kann dann ein Benutzermuster ermitteln. Dadurch wiederum kann die Förderpumpe so betrieben werden, dass sich ein optimierter Komfort für einen Betrieb eines Brauchwassersystems ergibt. Beispielsweise wird für eine bestimmte Zeitdauer vor einer erwarteten Zapfung eine Rezirkulation durchgeführt, um zu stark abgekühltes Wasser aus einer Warmwasserleitung zu "entfernen".It is particularly advantageous if a self-learning device is provided, which provides control signals for operating the feed pump on the basis of a user pattern, which is determined via the sensor device and the evaluation device. The evaluation device can provide data about a water tap. In principle, this data can be determined in a time-resolved manner. The self-learning device can then determine a user pattern. As a result, the feed pump can in turn be operated in such a way that there is optimized comfort for operating a domestic water system. For example, a recirculation is carried out for a certain period of time before an expected tap in order to "remove" excessively cooled water from a hot water pipe.

Bei einem Ausführungsbeispiel ist die Selbstlerneinrichtung an die Auswertungseinrichtung gekoppelt. Beispielsweise sind die Selbstlerneinrichtung und die Auswertungseinrichtung in dem gleichen Mikrocontroller angeordnet, in dem auch eine Motorschaltung eines Elektromotors der Förderpumpe angeordnet ist.In one embodiment, the self-learning device is coupled to the evaluation device. For example, the self-learning device and the evaluation device are arranged in the same microcontroller in which a motor circuit of an electric motor of the feed pump is also arranged.

Ganz besonders vorteilhaft ist es, wenn die Selbstlerneinrichtung ein Zeitglied umfasst, welches einen Zeitpunkt einer Wasserzapfung ermittelt, und entsprechende Zeitpunkte speichert, wobei eine Steuerung und/oder Einstellung und/oder Anpassung eines Betriebs der Förderpumpe gemäß gespeicherten Zeitpunkten erfolgt. Es lässt sich dadurch ein zeitaufgelöstes Benutzermuster ermitteln. Dadurch lässt sich eine Zeitsteuerung für den Betrieb der Förderpumpe durchführen.It is particularly advantageous if the self-learning device comprises a timer which determines a point in time of a water tap and stores corresponding points in time, with control and / or setting and / or adaptation of an operation of the feed pump taking place according to stored points in time. This enables a time-resolved user pattern to be determined. This allows a time control for the operation of the feed pump to be carried out.

Es ist dann günstig, wenn eine Inbetriebnahme der Förderpumpe in einem Zeitabstand und insbesondere bestimmten Zeitabstand (beispielsweise 15 Minuten) vor gespeicherten Zeitpunkten erfolgt und/oder eine Beendigung eines Betriebs der Förderpumpe nach einem Zeitabstand und insbesondere bestimmten Zeitabstand (wie beispielsweise 15 Minuten) zu gespeicherten Zeitpunkten erfolgt. Dadurch ergibt sich ein komfortabler Betrieb. Erfindungsgemäß wird ein Brauchwassersystem der eingangs genannten Art bereitgestellt, bei dem an der Rezirkulationsleitung eine erfindungsgemäße Pumpenvorrichtung angeordnet ist.It is then favorable if the feed pump is started up at a time interval and in particular a certain time interval (for example 15 minutes) before stored times and / or an end of operation of the feed pump after a time interval and in particular certain time interval (such as 15 minutes) at stored times. This results in comfortable operation. According to the invention, a process water system of the type mentioned in the introduction is provided, in which a pump device according to the invention is arranged on the recirculation line.

Das entsprechende Brauchwassersystem weist die bereits im Zusammenhang mit der erfindungsgemäßen Pumpenvorrichtung erläuterten Vorteile auf.The corresponding service water system has the advantages already explained in connection with the pump device according to the invention.

Erfindungsgemäß wird ferner ein Verfahren zum Betreiben eines Brauchwassersystems der eingangs genannten Art bereitgestellt, wobei eine erfindungsgemäße Pumpenvorrichtung an der Rezirkulationsleitung angeordnet ist. Eine Zapfung von Wasser aus der Warmwasserleitung wird bei laufender Förderpumpe mittels einer Ermittlung einer Durchströmung an Förderflüssigkeit durch die Förderpumpe detektiert, und eine Zapfung von Wasser aus der Warmwasserleitung bei stehender Förderpumpe wird aus gemessenen Temperaturänderungen an der Förderpumpe detektiert.According to the invention, a method for operating a domestic water system of the type mentioned at the outset is also provided, a pump device according to the invention being arranged on the recirculation line. A tap of water from the hot water pipe is detected while the feed pump is running by determining a flow of the conveying liquid through the feed pump, and a tap of water from the hot water pipe when the feed pump is at a standstill is detected from measured temperature changes at the feed pump.

Durch das erfindungsgemäße Verfahren lässt sich ein Benutzermuster ermitteln, ohne dass ein externer Sensor vorgesehen werden muss.A user pattern can be determined by the method according to the invention without an external sensor having to be provided.

Das erfindungsgemäße Verfahren weist die bereits im Zusammenhang mit der erfindungsgemäßen Pumpenvorrichtung erläuterten Vorteile auf.The method according to the invention has the advantages already explained in connection with the pump device according to the invention.

Erfindungsgemäß werden Temperaturänderungen an der Förderpumpe, welche zur Detektion einer Zapfung von Wasser aus der Warmwasserleitung verwendet werden, und dabei insbesondere innerhalb der Förderpumpe gemessen werden, durch Wasser bewirkt, welches von der Warmwasserbereitstellungseinrichtung durch die Bypassleitung in die Förderpumpe strömt. Es lässt sich dann auch beim Nichtbetrieb der Förderpumpe erkennen, ob eine Wasserzapfung stattfindet.According to the invention, temperature changes on the feed pump, which are used for the detection of a draw-off of water from the hot water pipe and are measured in particular within the feed pump, are brought about by water which flows from the hot water supply device through the bypass pipe into the feed pump. When the feed pump is not operating, it can then be recognized whether water is being drawn off.

Insbesondere wird bei der Detektion von Temperaturänderungen bei stehender Förderpumpe die Förderpumpe in Betrieb genommen. Dadurch lässt sich beispielsweise über Detektion einer Durchflussmenge verifizieren, ob eine Zapfung stattgefunden hat.In particular, the feed pump is put into operation when temperature changes are detected when the feed pump is stopped. This makes it possible to verify, for example, by detecting a flow rate whether a tap has taken place.

Es wird ferner erfindungsgemäß ein Selbstlernverfahren der eingangs genannten Art bereitgestellt, bei dem ein Benutzermuster bezüglich Wasserzapfung mit dem erfindungsgemäßen Verfahren zum Betreiben eines Brauchwassersystems ermittelt wird und basierend auf dem ermittelten Muster ein Pumpbetrieb der Förderpumpe gesteuert und/oder eingestellt und/oder angepasst wird.According to the invention, a self-learning method of the type mentioned at the outset is also provided, in which a user pattern relating to water tapping is determined using the method according to the invention for operating a domestic water system, and pump operation of the feed pump is controlled and / or set and / or adjusted based on the determined pattern.

Durch das erfindungsgemäße Selbstlernverfahren lässt sich auf sichere und komfortable Weise ein Benutzermuster erkennen, welches wiederum zum Steuern des Betriebs des Brauchwassersystems verwendet werden kann. Es ergibt sich dadurch ein komfortabler Betrieb.By means of the self-learning method according to the invention, a user pattern can be recognized in a safe and comfortable manner, which in turn can be used to control the operation of the domestic water system. This results in comfortable operation.

Insbesondere werden bei der Musterermittlung Zeitpunkte der Wasserzapfung gespeichert und ein Pumpbetrieb wird in einem Zeitabstand vor einem entsprechenden gespeicherten Zeitpunkt initiiert und/oder ein Pumpbetrieb wird in einem Zeitabstand nach einem entsprechenden gespeicherten Zeitpunkt beendet. Es ergibt sich dadurch ein komfortabler Betrieb.In particular, times of the water tap are stored during the pattern determination and a pumping operation is initiated at a time interval before a corresponding stored time and / or a pumping operation is ended at a time interval after a corresponding stored time. This results in comfortable operation.

Es kann dabei vorgesehen sein, dass ein ermitteltes Muster eine endliche Lebensdauer aufweist und insbesondere nach fehlender Benutzung des Musters für eine bestimmte Zeitdauer bezüglich des Betriebs der Förderpumpe deaktiviert wird. Dadurch lässt sich sicherstellen, dass ein seltenes Benutzermuster zu häufig verwendet wird.It can be provided that a determined pattern has a finite lifespan and is deactivated for a certain period of time with regard to the operation of the feed pump, in particular after the pattern has not been used. This ensures that a rare user pattern is used too often.

Beispielsweise weist das Muster einen n-Stunden-Anteil und einen überlagerten m-Tage-Anteil auf, wobei insbesondere n = 24 und insbesondere m = 7 ist. Dadurch lässt sich einem Tagesablauf ein Wochenablauf überlagern.For example, the pattern has an n-hour portion and a superimposed m-day portion, where n = 24 and in particular m = 7. This allows a daily schedule to be overlaid with a weekly schedule.

Die nachfolgende Beschreibung bevorzugter Ausführungsformen dient im Zusammenhang mit den Zeichnungen der näheren Erläuterung der Erfindung. Es zeigen:

Figur 1
eine schematische Darstellung eines Ausführungsbeispiels eines Brauchwassersystems mit einem Ausführungsbeispiel einer erfindungsgemäßen Pumpenvorrichtung in schematischer Darstellung;
Figur 2
eine Schnittansicht eines Ausführungsbeispiels einer Förderpumpe der Pumpenvorrichtung gemäß Figur 1;
Figur 3
eine Darstellung des Brauchwassersystems gemäß Figur 1, wobei die Strömungsrichtung von Wasser eingezeichnet ist bei einer Rezirkulationsführung und einem geöffneten Rückschlagventil ohne Wasserzapfung;
Figur 4
das Brauchwassersystem gemäß Figur 1 bei Wasserzapfung, wobei die Strömungsrichtung gezeigt ist bei geschlossenem Rückschlagventil;
Figur 5
schematisch den Zusammenhang zwischen Förderhöhe einer Förderpumpe und Durchflussmenge durch die Förderpumpe und zwischen Leistungsaufnahme eines Elektromotors der Förderpumpe und Fördermenge;
Figur 6
schematisch die Zeitabhängigkeit einer Temperatur, welche an einer Förderpumpe gemessen wird in Abhängigkeit von "Ereignissen" an dem Brauchwassersystem; und
Figur 7
eine schematische Darstellung einer Auswertungseinrichtung der Pumpenvorrichtung gemäß Figur 1.
The following description of preferred embodiments serves in conjunction with the drawings to explain the invention in more detail. Show it:
Figure 1
is a schematic representation of an embodiment of a domestic water system with an embodiment of a pump device according to the invention in a schematic representation;
Figure 2
a sectional view of an embodiment of a feed pump of the pump device according to Figure 1 ;
Figure 3
a representation of the domestic water system according Figure 1 , The direction of flow of water is shown with a recirculation and an open check valve without water tap;
Figure 4
the domestic water system according to Figure 1 with water tap, the direction of flow is shown with the check valve closed;
Figure 5
schematically shows the relationship between the head of a feed pump and the flow rate through the feed pump and between the power consumption of an electric motor of the feed pump and the flow rate;
Figure 6
schematically the time dependence of a temperature, which is measured on a feed pump as a function of "events" on the domestic water system; and
Figure 7
a schematic representation of an evaluation device of the pump device according to Figure 1 ,

Ein Ausführungsbeispiel eines erfindungsgemäßen Brauchwassersystems, welches in Figur 1 gezeigt und schematisch mit 10 bezeichnet ist, umfasst eine Warmwasserbereitstellungseinrichtung 12. Diese weist insbesondere einen Warmwassertank 14 auf, welcher warmes Wasser speichert.An embodiment of a domestic water system according to the invention, which in Figure 1 shown and schematically designated 10, comprises a hot water supply device 12. This has in particular a hot water tank 14, which stores warm water.

Beispielsweise ist dem Warmwassertank 14 ein Boiler 16 zugeordnet.For example, a boiler 16 is assigned to the hot water tank 14.

Die Warmwasserbereitstellungseinrichtung 12 weist eine Zuführungseinrichtung 18 für Frischwasser (Kaltwasser) auf, über welche aufheizbares Frischwasser zuführbar ist.The hot water supply device 12 has a supply device 18 for fresh water (cold water), via which heatable fresh water can be supplied.

An die Warmwasserbereitstellungseinrichtung 12 ist eine Warmwasserleitung 20 angeschlossen, mittels welcher Warmwasser aus dem Warmwassertank 14 entnehmbar ist.A hot water line 20 is connected to the hot water supply device 12, by means of which hot water can be removed from the hot water tank 14.

An der Warmwasserleitung 20 sind Zapfstellen 22a, 22b, 22c angeschlossen. Die Zapfstellen umfassen beispielsweise einen oder mehrere Wasserhähne und einen oder mehrere Duschköpfe. An ihnen ist Warmwasser entnehmbar.Tap points 22a, 22b, 22c are connected to the hot water line 20. The taps include, for example, one or more taps and one or more shower heads. Hot water can be taken from them.

Nach der letzten Zapfstelle (in Figur 1 mit 22c bezeichnet) ist an die Warmwasserleitung 20 eine Rezirkulationsleitung 24 angeschlossen. Die Rezirkulationsleitung ist eine Fortsetzung der Warmwasserleitung 20 nach der letzten Zapfstelle 22c. Die Rezirkulationsleitung 24 führt zu der Warmwasserbereitstellungseinrichtung 12 und ist dabei an den Warmwassertank 14 angeschlossen.After the last tap (in Figure 1 designated 22c) a recirculation line 24 is connected to the hot water line 20. The recirculation line is a continuation of the hot water line 20 after the last tap 22c. The recirculation line 24 leads to the hot water supply device 12 and is connected to the hot water tank 14.

Über die Rezirkulationsleitung 24 lässt sich in einem Nichtzapfbetrieb von Zapfstellen 22a usw. warmes Wasser zwischen einem ersten Anschluss 26 und einem zweiten Anschluss 28 der Warmwasserbereitstellungseinrichtung 12 zirkulieren. Über den ersten Anschluss 26 ist die Warmwasserleitung 20 an die Warmwasserbereitstellungseinrichtung 12 angeschlossen. Über den zweiten Anschluss 28 ist die Rezirkulationsleitung 24 an die Warmwasserbereitstellungseinrichtung 12 angeschlossen.Warm water can be circulated between a first connection 26 and a second connection 28 of the hot water supply device 12 via the recirculation line 24 when tapping points 22a etc. are not being tapped. The hot water line 20 is connected to the hot water supply device 12 via the first connection 26. The recirculation line 24 is connected to the hot water supply device 12 via the second connection 28.

Durch eine Rezirkulation von Warmwasser zwischen dem ersten Anschluss 26 und dem zweiten Anschluss 28 lässt sich für warmes Wasser, welches sich in der Warmwasserleitung 20 befindet, ein bestimmtes Temperaturniveau aufrechterhalten. Dadurch wird eine zu starke Auskühlung von Warmwasser in der Warmwasserleitung 20 verhindert und bei Zapfung an einer Zapfstelle 22a tritt kein insbesondere in der Leitung zu stark abgekühltes Wasser aus.By recirculating hot water between the first connection 26 and the second connection 28, a certain temperature level can be maintained for warm water which is located in the hot water line 20. This prevents excessive cooling of hot water in the hot water pipe 20 and, when tapped at a tap 22a, no water that has cooled too much, particularly in the pipe, escapes.

Zur Förderung von Warmwasser in der Rezirkulationsleitung 24 ist eine Pumpenvorrichtung 30 vorgesehen. Diese Pumpenvorrichtung 30 ist an der Rezirkulationsleitung 24 angeordnet. Mittels der Pumpenvorrichtung 30 wird Förderflüssigkeit, nämlich warmes Wasser, zwischen dem ersten Anschluss 26 und dem zweiten Anschluss 28 gefördert.A pump device 30 is provided to convey hot water in the recirculation line 24. This pump device 30 is arranged on the recirculation line 24. Pumped liquid 30, namely warm water, is conveyed between the first connection 26 and the second connection 28 by means of the pump device 30.

Die Pumpenvorrichtung 30 umfasst eine Förderpumpe 116.The pump device 30 comprises a feed pump 116.

Die Pumpenvorrichtung 30 weist ferner ein Rückschlagventil 32 auf und eine Bypassleitung 34. Die Bypassleitung 34 ist parallel zu dem Rückschlagventil 32 angeordnet. Über sie ist das Rückschlagventil "überbrückbar", das heißt umgehbar. Die Bypassleitung 34 kann sich aus einem Leitungsstück oder aus mehreren Leitungsstücken zusammensetzen.The pump device 30 also has a check valve 32 and a bypass line 34. The bypass line 34 is arranged parallel to the check valve 32. The check valve can be "bridged", ie bypassed, via them. The bypass line 34 can be composed of one line section or of several line sections.

Die Bypassleitung 34 und das Rückschlagventil 32 bilden eine Kombination 36. Diese Kombination 36 ist in Serie zu der Förderpumpe 116 angeordnet.The bypass line 34 and the check valve 32 form a combination 36. This combination 36 is arranged in series with the feed pump 116.

Die Pumpenvorrichtung 30 umfasst einen ersten Anschluss 38 und einen zweiten Anschluss 40. Über den ersten Anschluss 38 ist die Kombination 36 direkt fluidwirksam mit der Warmwasserbereitstellungseinrichtung 12 verbunden und dabei mit deren zweiten Anschluss 28 fluidwirksam verbunden. Über den zweiten Anschluss 40 ist die Förderpumpe 116 an die Rezirkulationsleitung 24 angeschlossen. Bei einem Förderbetrieb der Pumpenvorrichtung 30 strömt Förderflüssigkeit (Wasser) von dem zweiten Anschluss 40 zu dem ersten Anschluss 38 in den Warmwassertank 14.The pump device 30 comprises a first connection 38 and a second connection 40. The combination 36 is directly fluidly connected to the hot water supply device 12 via the first connection 38 and is fluidly connected to the second connection 28 thereof. The feed pump 116 is connected to the recirculation line 24 via the second connection 40. During a conveying operation of the pump device 30, conveying liquid (water) flows from the second connection 40 to the first connection 38 into the hot water tank 14.

Ein Ausführungsbeispiel einer Förderpumpe 116 (Umwälzpumpe) ist beispielsweise aus der DE 10 2007 054 313 A1 oder der US 2009/0121034 bekannt. Auf diese Dokumente wird ausdrücklich und vollinhaltlich Bezug genommen.An embodiment of a feed pump 116 (circulation pump) is, for example, from the DE 10 2007 054 313 A1 or the US 2009/0121034 known. Reference is expressly made to these documents in full.

Die Pumpe 116 (Figur 2) umfasst einen Elektromotor 120 mit einem Stator 122 und einem Rotor 124.The pump 116 ( Figure 2 ) comprises an electric motor 120 with a stator 122 and a rotor 124.

Der Elektromotor 120 weist ein Motorgehäuse 126 auf, in welchem der Stator 122 und der Rotor 124 angeordnet sind.The electric motor 120 has a motor housing 126, in which the stator 122 and the rotor 124 are arranged.

Der Elektromotor 120 weist ferner eine Motorschaltung 128 auf. Die Motorschaltung 128 ist in einem Schaltungsgehäuse 130 angeordnet. Das Schaltungsgehäuse 130 kann dabei, wie in Figur 2 gezeigt, getrennt von dem Motorgehäuse 126 sein oder mittels des Motorgehäuses 126 gebildet sein.The electric motor 120 also has a motor circuit 128. The motor circuit 128 is arranged in a circuit housing 130. The circuit housing 130 can, as in FIG Figure 2 shown, be separate from the motor housing 126 or be formed by means of the motor housing 126.

Der Rotor 124 ist über eine Lagerschale 132 an einem konvexen Lagerkörper 134, welcher insbesondere als Lagerkugel beispielsweise aus einem Keramikmaterial ausgebildet ist, gelagert. Über den Lagerkörper 134 und die Lagerschale 132 ist ein sphärisches Lager gebildet.The rotor 124 is supported via a bearing shell 132 on a convex bearing body 134, which is designed in particular as a bearing ball, for example made of a ceramic material. A spherical bearing is formed over the bearing body 134 and the bearing shell 132.

Ein Laufrad 136 ist drehfest mit dem Rotor 124 verbunden. Das Laufrad 136 rotiert um eine Rotationsachse 138 in einem Förderraum 140. Der Förderraum 140 ist von Förderflüssigkeit durchströmbar, wobei im Pumpenbetrieb die Durchströmung durch das Laufrad 136 angetrieben ist.An impeller 136 is rotatably connected to the rotor 124. The impeller 136 rotates about a rotation axis 138 in a delivery chamber 140. The delivery chamber 140 can be flowed through by the conveying liquid, the flow being driven by the impeller 136 in pump operation.

Die Förderpumpe 116 umfasst einen Temperatursensor 142.The feed pump 116 includes a temperature sensor 142.

Der Temperatursensor 142 ist so angeordnet und ausgebildet, dass über ihn eine Temperatur von Förderflüssigkeit in dem Förderraum 140 ermittelbar ist.The temperature sensor 142 is arranged and designed such that it can be used to determine a temperature of the conveyed liquid in the conveying space 140.

Bevorzugterweise sitzt der Temperatursensor 142 außerhalb des Förderraums 140. Dadurch kann der Temperatursensor 142 konstruktiv einfacher ausgebildet sein, da er nicht flüssigkeitsbeaufschlagt ist.The temperature sensor 142 is preferably located outside the delivery chamber 140. As a result, the temperature sensor 142 can be of simpler design since it is not exposed to liquid.

Der Förderraum 140 ist durch eine Wandung 144 begrenzt. Bei einem Ausführungsbeispiel sitzt der Temperatursensor 142 außerhalb des Förderraums 140 an der Wandung 144. Er sitzt beispielsweise direkt an einer Außenseite der Wandung 144 oder in einem kleinen Abstand zu dieser Außenseite. Er steht insbesondere in thermischem Kontakt mit der Wandung 144.The conveying space 140 is delimited by a wall 144. In one exemplary embodiment, the temperature sensor 142 is located on the wall 144 outside the delivery space 140. It is seated, for example, directly on an outside of the wall 144 or at a small distance from this outside. In particular, it is in thermal contact with the wall 144.

Es ist bevorzugt vorgesehen, dass, wie in Figur 2 durch das Bezugszeichen 146 angedeutet, der Temperatursensor an dem Motorgehäuse 126 sitzt und dabei in thermischem Kontakt zu dem Förderraum 140 steht.It is preferably provided that, as in Figure 2 indicated by reference numeral 146, the temperature sensor sits on the motor housing 126 and is in thermal contact with the delivery chamber 140.

Die Pumpenvorrichtung 30 weist eine Auswertungseinrichtung 42 auf, welche insbesondere in die Förderpumpe 116 integriert ist. Der Temperatursensor 142 bzw. 146 stellt seine Temperatursignale der Auswertungseinrichtung 148 zur Verfügung. Die Auswertungseinrichtung 42 ist beispielsweise in die Motorschaltung 128 integriert.The pump device 30 has an evaluation device 42, which is integrated in particular into the feed pump 116. The temperature sensor 142 or 146 makes its temperature signals available to the evaluation device 148. The evaluation device 42 is integrated in the motor circuit 128, for example.

Die Förderpumpe 116 hat ein Gehäuse 150. Das Gehäuse 150 ist insbesondere thermisch isoliert. Innerhalb des Gehäuses 150 ist das Laufrad 36 angeordnet. Der Elektromotor 20 ist zumindest teilweise innerhalb des Gehäuses 150 angeordnet. Der Temperatursensor 142 bzw. 146 ist innerhalb des Gehäuses 150 angeordnet.The feed pump 116 has a housing 150. The housing 150 is in particular thermally insulated. The impeller 36 is arranged within the housing 150. The electric motor 20 is at least partially arranged within the housing 150. The temperature sensor 142 or 146 is arranged within the housing 150.

Bei einem Ausführungsbeispiel weist das Gehäuse 150 als ersten Gehäuseteil ein Pumpengehäuse 151 und als zweiten Gehäuseteil das Motorgehäuse 126 auf. Das Motorgehäuse 126 sitzt an dem Pumpengehäuse 151. In dem Pumpengehäuse 151 ist das Laufrad 136 positioniert. Der Temperatursensor 142 sitzt in dem Gehäuse 150 und dabei insbesondere in dem Motorgehäuse 126 oder beispielsweise außen am Pumpengehäuse 151. Der Temperatursensor 146 sitzt ebenfalls in dem Motorgehäuse 126.In one embodiment, the housing 150 has a pump housing 151 as the first housing part and the motor housing 126 as the second housing part. The motor housing 126 is seated on the pump housing 151. The impeller 136 is positioned in the pump housing 151. The temperature sensor 142 is located in the housing 150 and in particular in the motor housing 126 or, for example, on the outside of the pump housing 151. The temperature sensor 146 is also located in the motor housing 126.

Für eine einfache Demontierbarkeit des Elektromotors 120 von dem Pumpengehäuse 151 ist es vorteilhaft, wenn der Temperatursensor 146 verwendet wird. In diesem Falle müssen keine Kabelverbindungen für den Temperatursensor in dem Pumpengehäuse 151 verlaufen.For easy removal of the electric motor 120 from the pump housing 151, it is advantageous if the temperature sensor 146 is used. In this case, no cable connections for the temperature sensor need to run in the pump housing 151.

Bei einer Ausführungsform ist dem Temperatursensor (beispielsweise dem Temperatursensor 142) eine Temperiereinrichtung zugeordnet. Die Temperiereinrichtung sorgt dafür, dass in einer Umgebung des Temperatursensors 142 definierte Temperaturverhältnisse vorliegen. Dadurch können zeitliche Temperaturänderungen direkt Temperaturänderungen der Förderflüssigkeit in dem Förderraum 140 zugeordnet werden.In one embodiment, the temperature sensor (for example the temperature sensor 142) is assigned a temperature control device. The temperature control device ensures that there are defined temperature conditions in an environment of the temperature sensor 142. As a result, changes in temperature over time can be directly associated with temperature changes in the conveyed liquid in the conveying space 140.

Bei einer Ausführungsform umfasst die Temperiereinrichtung eine Temperierkammer. Diese weist ein Gehäuse insbesondere aus einem thermisch isolierenden Material auf. Der Temperatursensor 142 (bzw. 146) ist dann in dem Gehäuse angeordnet und steht dabei in thermischem Kontakt mit dem Förderraum 140. Beispielsweise ist er direkt an der Wandung 144 angeordnet oder es ist eine Wärmeleitungsverbindung zwischen der Wandung 144 und dem Temperatursensor 142 bzw. 146 und dem Gehäuse vorgesehen.In one embodiment, the temperature control device comprises a temperature control chamber. This has a housing in particular made of a thermally insulating material. The temperature sensor 142 (or 146) is then arranged in the housing and is in thermal contact with the delivery chamber 140. For example, it is arranged directly on the wall 144 or it is a thermal conduction connection between the wall 144 and the temperature sensor 142 or 146 and provided the housing.

Bei einer Ausführungsform umfasst die Temperiereinrichtung mindestens ein Heizelement und insbesondere Widerstandsheizelement, welches in der Temperierkammer angeordnet ist. Durch entsprechende elektrische Beaufschlagung des Heizelements kann eine definierte Temperatur in der Temperierkammer und damit in der Umgebung des Temperatursensors 142 bzw. 146 eingestellt werden.In one embodiment, the temperature control device comprises at least one heating element and in particular resistance heating element, which is arranged in the temperature control chamber. A defined temperature can be set in the temperature control chamber and thus in the vicinity of the temperature sensor 142 or 146 by appropriate electrical application of the heating element.

Bei einem Ausführungsbeispiel ist die Auswertungseinrichtung 42 auf einem Träger 44 (Figur 7) angeordnet. Der Träger 44 ist dabei insbesondere in dem Schaltungsgehäuse 130 positioniert.In one embodiment, the evaluation device 42 is on a carrier 44 ( Figure 7 ) arranged. The carrier 44 is positioned in particular in the circuit housing 130.

Auf dem gleichen Träger 44 oder auf einem mit dem Träger 44 verbundenen Träger ist die Motorschaltung 128 angeordnet, welche den Elektromotor 120 ansteuert. Der Temperatursensor 142, 146 ist signalwirksam mit der Auswertungseinrichtung 42 verbunden, das heißt die entsprechenden Temperatursignale werden der Auswertungseinrichtung 42 bereitgestellt, welche die Temperatursignale überwacht.The motor circuit 128, which controls the electric motor 120, is arranged on the same carrier 44 or on a carrier connected to the carrier 44. The temperature sensor 142, 146 is connected in a signal-effective manner to the evaluation device 42, that is to say the corresponding temperature signals are made available to the evaluation device 42, which monitors the temperature signals.

Wie unten später noch erläutert wird, ist über den Temperatursensor 142 beziehungsweise den Temperatursensor 146 (gegebenenfalls in Kombination mit der Temperiereinrichtung) eine Sensoreinrichtung gebildet, über welche sich bei stehender Förderpumpe 116 eine Wasserzapfung an der Warmwasserleitung 20 detektieren lässt.As will be explained later, a sensor device is formed via the temperature sensor 142 or the temperature sensor 146 (possibly in combination with the temperature control device), via which a water tap on the hot water line 20 can be detected when the feed pump 116 is stopped.

Es ist ferner eine Sensoreinrichtung 46 vorgesehen (Figur 7), welche die Drehzahl n des Rotors 124 des Elektromotors 120 ermittelt und/oder die Leistungsaufnahme P des Elektromotors 120 ermittelt. Dies wird untenstehend noch näher erläutert.A sensor device 46 is also provided ( Figure 7 ), which determines the speed n of the rotor 124 of the electric motor 120 and / or determines the power consumption P of the electric motor 120. This is explained in more detail below.

Die Sensoreinrichtung 46 ist dabei insbesondere in den Elektromotor 120 integriert und beispielsweise in die Motorschaltung 128 integriert.The sensor device 46 is integrated in particular in the electric motor 120 and, for example, integrated in the motor circuit 128.

Die Sensoreinrichtung 46 ist ebenfalls signalwirksam mit der Auswertungseinrichtung 42 verbunden.The sensor device 46 is also connected to the evaluation device 42 in a signal-effective manner.

Auf dem Träger 44 ist ferner eine Selbstlerneinrichtung 48 positioniert. Die Auswertungseinrichtung 42 wertet entsprechende Sensordaten der Sensoreinrichtung 46 und des Temperatursensors 142 beziehungsweise 146 aus.A self-learning device 48 is also positioned on the carrier 44. The evaluation device 42 evaluates corresponding sensor data of the sensor device 46 and the temperature sensor 142 or 146.

Die Selbstlerneinrichtung 48 kann, wie untenstehend noch näher erläutert wird, aus den entsprechenden ausgewerteten Daten ein Benutzermuster für die Warmwassernutzung generieren, welches insbesondere in seiner zeitlichen Abhängigkeit erfasst wird. Dazu umfasst die Selbstlerneinrichtung 48 ein Zeitglied 50, mittels welchem sich die Zeitpunkte der Warmwasserzapfung an der Warmwasserleitung 20 ermitteln lassen.As will be explained in more detail below, the self-learning device 48 can generate a user pattern for the use of hot water from the corresponding evaluated data, which is recorded in particular as a function of time. For this purpose, the self-learning device 48 includes a Timer 50, by means of which the times of the hot water tap on the hot water line 20 can be determined.

Die Selbstlerneinrichtung 48 wiederum generiert Daten für die Motorschaltung 128 zur Ansteuerung des Elektromotors 120 und damit der Förderpumpe 116.The self-learning device 48 in turn generates data for the motor circuit 128 for controlling the electric motor 120 and thus the feed pump 116.

Dies wird untenstehend noch näher erläutert.This is explained in more detail below.

Die Selbstlerneinrichtung 48 kann in die Motorschaltung 128 integriert sein.The self-learning device 48 can be integrated in the motor circuit 128.

Beispielsweise umfasst ein Mikrocontroller der Motorschaltung 128 auch die Auswertungseinrichtung 42 und die Selbstlerneinrichtung 48.For example, a microcontroller of the motor circuit 128 also includes the evaluation device 42 and the self-learning device 48.

In der Kombination 36 weist die Bypassleitung vorzugsweise einen hydraulischen Querschnitt auf, welcher kleiner ist als der hydraulische Querschnitt der Rezirkulationsleitung 24. Insbesondere liegt der hydraulische Querschnitt der Bypassleitung 34 im Bereich zwischen 5 % und 15 % des hydraulischen Querschnitts der Rezirkulationsleitung 24. Bei einem Ausführungsbeispiel liegt der hydraulische Querschnitt der Bypassleitung 34 bei circa 10 % des hydraulischen Querschnitts der Rezirkulationsleitung 24.In combination 36, the bypass line preferably has a hydraulic cross section which is smaller than the hydraulic cross section of recirculation line 24. In particular, the hydraulic cross section of bypass line 34 is in the range between 5% and 15% of the hydraulic cross section of recirculation line 24. In one exemplary embodiment the hydraulic cross section of the bypass line 34 is approximately 10% of the hydraulic cross section of the recirculation line 24.

Der Querschnitt der Bypassleitung 34 ist so gewählt, dass er ausreichend groß ist, dass keine Verstopfung aufgrund von Kalk oder Schmutzpartikeln auftritt und ist andererseits so klein gewählt, dass bei Zapfung die durch die Bypassleitung 34 zu einer Zapfstelle fließende Wassermenge so klein ist, dass die Wassertemperatur an der Zapfstelle nicht merklich beeinflusst wird. (Die entsprechende rückströmende Wassermenge kann gegebenenfalls aus kaltem Wasser bestehen.)The cross-section of the bypass line 34 is selected such that it is sufficiently large that there is no blockage due to limescale or dirt particles and, on the other hand, is selected so small that the amount of water flowing through the bypass line 34 to a tap is so small that the Water temperature at the tap is not noticeably affected. (The corresponding backflow of water can possibly consist of cold water.)

Das Rückschlagventil 32 ist so angeordnet und ausgebildet, dass die Förderpumpe 116 gegen einen Rückfluss von Wasser (Warmwasser) aus der Warmwasserbereitstellungseinrichtung 12 geschützt ist und Wasser aus dem Wassertank 14 sich an der Rezirkulationsleitung 24 mit Wasser aus der Warmwasserleitung 20 mischen kann.The check valve 32 is arranged and designed such that the feed pump 116 is protected against a backflow of water (hot water) from the hot water supply device 12 and water from the Water tank 14 can mix on the recirculation line 24 with water from the hot water line 20.

Die Bypassleitung 34 erlaubt jedoch in einem gewissen Umfang eine Rückströmung aus messtechnischen Gründen, wie untenstehend noch näher erläutert wird. Diese Rückströmung ist durch den entsprechend klein gewählten hydraulischen Durchmesser der Bypassleitung 34 jedoch begrenzt und "klein" gehalten.However, the bypass line 34 allows a certain amount of backflow for measurement reasons, as will be explained in more detail below. However, this backflow is limited by the correspondingly small hydraulic diameter of the bypass line 34 and is kept "small".

Insbesondere ist durch Ausgestaltung der Bypassleitung 34 die Rückströmung für einen Durchsatz von Förderflüssigkeit begrenzt, welche höchstens 15 % eines Durchsatzes von Förderflüssigkeit durch die Pumpenvorrichtung 30 in einem normalen Rezirkulationsbetrieb, wenn Förderflüssigkeit von dem zweiten Anschluss 40 zu dem ersten Anschluss 38 befördert wird, beträgt.In particular, the design of the bypass line 34 limits the backflow for a throughput of conveyed liquid, which is at most 15% of a throughput of conveyed liquid through the pump device 30 in normal recirculation operation when conveyed liquid is conveyed from the second connection 40 to the first connection 38.

In einem normalen Betrieb des Brauchwassersystems 10 ohne Wasserzapfung fördert die Pumpenvorrichtung 30 eine gewisse Menge an Warmwasser durch die Warmwasserleitung 20 und die Rezirkulationsleitung 24. Es wird Warmwasser von der Warmwasserbereitstellungseinrichtung 12 durch die Warmwasserleitung 20 zirkuliert, wobei die Rezirkulationsleitung 24, welche zu dem Warmwassertank 14 führt, den Förderkreis schließt. Die Förderpumpe 116 sorgt für die Wasserförderung. Dieser "Normalbetrieb" ist in Figur 3 gezeigt. In diesem Normalbetrieb ist das Rückschlagventil 32 offen (in Figur 3 durch "O") angedeutet. Eine Strömungsrichtung von Warmwasser ist durch Doppelpfeile angedeutet.In normal operation of the domestic water system 10 without water tapping, the pump device 30 conveys a certain amount of hot water through the hot water line 20 and the recirculation line 24. Hot water is circulated from the hot water supply device 12 through the hot water line 20, the recirculation line 24 leading to the hot water tank 14 leads, closes the funding group. The feed pump 116 provides water delivery. This "normal operation" is in Figure 3 shown. In this normal operation, the check valve 32 is open (in Figure 3 indicated by "O"). A direction of flow of hot water is indicated by double arrows.

Grundsätzlich kann dabei die Rezirkulation von Warmwasser während Zeiten, in denen eine Warmwasserzapfung erwartet wird, ständig erfolgen oder sie kann beispielsweise getaktet erfolgen.In principle, the recirculation of hot water can take place continuously during times in which hot water is expected to be drawn off, or it can, for example, be clocked.

Die Rezirkulation von Warmwasser durch die Warmwasserleitung 20 und die Rezirkulationsleitung 24 kann insbesondere in Abhängigkeit von einem bestimmten Benutzermuster erfolgen, um einen energiesparenden Betrieb zu ermöglichen. Beispielsweise muss in längeren Ruhephasen keine Warmwasserzirkulation erfolgen. Das Benutzermuster wiederum lässt sich über die Auswertungseinrichtung 42 ermitteln und über die Selbstlerneinrichtung 48 können der Motorschaltung 128 entsprechende Daten zur Steuerung und/oder Einstellung und/oder Anpassung des Betriebs der Förderpumpe 116 bereitgestellt werden.The recirculation of hot water through the hot water line 20 and the recirculation line 24 can take place in particular in dependence on a specific user pattern in order to achieve an energy-saving operation enable. For example, there is no need for hot water circulation in longer periods of rest. The user pattern can in turn be determined via the evaluation device 42 and the self-learning device 48 can be used to provide the motor circuit 128 with corresponding data for controlling and / or setting and / or adapting the operation of the feed pump 116.

In dem "Rezirkulationszustand" gemäß Figur 3 wird der Hauptteil von Förderflüssigkeit, welche durch die Kombination 36 durchgeführt wird, durch das offene Rückschlagventil 32 durchgeführt. Ein kleinerer Teil des Gesamtdurchsatzes kann durch die Bypassleitung 34 durchströmen, wobei dieser Teil insbesondere höchstens 15 % beträgt, wie oben erläutert.In the "recirculation state" according to Figure 3 most of the delivery fluid that is passed through the combination 36 is passed through the open check valve 32. A smaller part of the total throughput can flow through the bypass line 34, this part being in particular at most 15%, as explained above.

Wenn ausgehend von dem "Rezirkulationszustand" gemäß Figur 3 an einer Zapfstelle wie beispielsweise der Zapfstelle 22a Warmwasser gezapft wird, dann nimmt aufgrund der Öffnung an der Warmwasserleitung 20 der Druck an dem Rückschlagventil 32 ab und das Rückschlagventil schließt. Dies ist in Figur 4 schematisch gezeigt, wobei "C" den geschlossenen Zustand des Rückschlagventils 32 andeutet.If based on the "recirculation state" according to Figure 3 at a tap such as tap 22a, hot water is drawn, then the pressure at the check valve 32 decreases due to the opening on the hot water line 20 and the check valve closes. This is in Figure 4 shown schematically, "C" indicating the closed state of the check valve 32.

Beispielsweise liegt der dynamische Druck an der Förderpumpe 116 bezogen auf eine Förderhöhe in der Größe von 1 m. Der statische Druck in dem Brauchwassersystem 10 liegt in einer Größenordnung bezogen auf eine Förderhöhe im Bereich zwischen 30 m und 50 m, so dass durch eine Wasserzapfung an der Warmwasserleitung 20 auf sichere Weise das Rückschlagventil 32 schließt.For example, the dynamic pressure at the feed pump 116 is 1 m in relation to a delivery head. The static pressure in the domestic water system 10 is of the order of magnitude in relation to a delivery head in the range between 30 m and 50 m, so that the check valve 32 closes in a safe manner by tapping water on the hot water line 20.

Durch die Ausbildung der Pumpvorrichtung 30 lässt sich über Elemente der Pumpenvorrichtung 30 eine Wasserzapfung an der Warmwasserleitung 20 detektieren, sowohl wenn die Förderpumpe 116 in Betrieb ist als auch wenn die Förderpumpe 116 nicht in Betrieb ist.By designing the pump device 30, elements of the pump device 30 can be used to detect a water tap on the hot water line 20, both when the feed pump 116 is in operation and when the feed pump 116 is not in operation.

Wenn, ausgehend von dem "Rezirkulationszustand" gemäß Figur 3, bei dem die Förderpumpe 116 in Betrieb ist, eine Wasserzapfung an der Warmwasserleitung 20 erfolgt und dadurch das Rückschlagventil 32 schließt, dann ändert sich die Durchflussmenge an Förderflüssigkeit (Wasser) durch die Förderpumpe 116. Dies ist über die Sensoreinrichtung 46 detektierbar.If, based on the "recirculation state" according to Figure 3 , in which the feed pump 116 is in operation, water is tapped from the hot water line 20 and the check valve 32 thereby closes, the flow rate of feed liquid (water) through the feed pump 116 changes. This can be detected by the sensor device 46.

Grundsätzlich ist die Durchströmungsmenge Q proportional zur dritten Wurzel einer Motorleistung P des Elektromotors 120; die Motorleistung P ist die Leistungsaufnahme des Elektromotors 120. Die Durchströmungsmenge Q ist ferner proportional zur Drehzahl n des Elektromotors 120, das heißt zur Drehzahl n des Laufrads 136 der Förderpumpe 116, welche wiederum der Drehzahl des Rotors 124 des Elektromotors 120 entspricht. Bei bekannter und insbesondere vorgegebener Drehzahl n lässt sich dann durch die messbare Motorleistung P die Durchströmungsmenge Q ermitteln.Basically, the flow rate Q is proportional to the third root of a motor power P of the electric motor 120; the motor power P is the power consumption of the electric motor 120. The flow rate Q is also proportional to the speed n of the electric motor 120, that is to say the speed n of the impeller 136 of the feed pump 116, which in turn corresponds to the speed of the rotor 124 of the electric motor 120. With a known and in particular predetermined speed n, the measurable engine power P can then be used to determine the flow rate Q.

Bezüglich eines Verfahrens zur Bestimmung der Durchströmungsmenge einer Flüssigkeit durch eine Leitung mit Hilfe einer Förderpumpe wird auf die DE 10 2007 054 313 A1 und die DE 10 2013 109 134 A1 verwiesen, auf die ausdrücklich Bezug genommen wird.With regard to a method for determining the flow rate of a liquid through a line with the aid of a feed pump, reference is made to the DE 10 2007 054 313 A1 and the DE 10 2013 109 134 A1 referred to, to which express reference is made.

Es ist insbesondere vorgesehen, eine Durchflussermittlung bei einer konstanten Drehzahl n durchzuführen. Dazu muss ermittelt werden, auf welchem Punkt der Pumpenkurve die Förderpumpe 116 gerade arbeitet.In particular, it is provided to determine the flow rate at a constant speed n. To do this, it must be determined at which point of the pump curve the feed pump 116 is currently working.

In erster Näherung ist die Pumpenkurve durch eine lineare Beziehung gegeben (Figur 5). Der entsprechende Zusammenhang wird einmal ermittelt und in einem Speicher der Auswertungseinrichtung 42 gespeichert. Es sind also entsprechende Kalibrierdaten bereitgestellt, welche werkseitig in der Förderpumpe 116 gespeichert sind.In a first approximation, the pump curve is given by a linear relationship ( Figure 5 ). The corresponding relationship is determined once and stored in a memory of the evaluation device 42. Corresponding calibration data are thus provided, which are stored in the delivery pump 116 at the factory.

Beispielsweise wird bei vorgegebener Drehzahl n die Motorleistung P durch die Sensoreinrichtung 46 ermittelt. Es wird dann in der in der Auswertungseinrichtung 42 gespeicherten Tabelle "nachgeschlagen" und so auf die derzeitige (aktuelle) Durchströmungsmenge Q geschlossen.For example, at predetermined speed n, engine power P is determined by sensor device 46. It will then be in the in the Evaluation device 42 "looked up" stored table and thus concluded on the current (current) flow rate Q.

Bei üblichen Hocheffizienzpumpen als Förderpumpen 116 nimmt bei konstanter Drehzahl n üblicherweise die Leistungsaufnahme bei Erhöhung der Durchströmungsmenge von 0 auf das Maximum nahezu linear um circa 25 % zu.With conventional high-efficiency pumps as feed pumps 116, at constant speed n, the power consumption usually increases almost linearly by approximately 25% when the flow rate increases from 0 to the maximum.

Die Auswertungseinrichtung 42 erhält Daten der Sensoreinrichtung 46 und überwacht diese. Die Auswertungseinrichtung 42 überwacht insbesondere den absoluten Wert der Durchströmungsmenge beziehungsweise prüft, ob eine Änderung der Durchströmungsmenge Q insbesondere oberhalb einer Schwelle vorliegt. Eine entsprechende signifikante Änderung bedeutet dann eine Zapfung an der Warmwasserleitung 20.The evaluation device 42 receives data from the sensor device 46 and monitors it. The evaluation device 42 monitors in particular the absolute value of the flow rate or checks whether there is a change in the flow rate Q, in particular above a threshold. A corresponding significant change then means a tap on the hot water line 20.

Durch das eben beschriebene Verfahren lässt sich erkennen, ob (und mit Hilfe des Zeitglieds 50 wann) eine Wasserzapfung an der Warmwasserleitung 20 stattfindet, sofern die Förderpumpe 116 in Betrieb ist, das heißt ausgehend von dem "Rezirkulationszustand" gemäß Figur 3.The method just described can be used to determine whether (and with the help of the timer 50 when) water is being drawn from the hot water line 20 if the feed pump 116 is in operation, that is to say based on the “recirculation state” Figure 3 ,

In Figur 5 ist schematisch eine Pumpenkurve für die Förderpumpe 116 gezeigt, welche eine Förderhöhe H in Abhängigkeit der Durchflussmenge Q angibt. Es wird dabei von einer konstanten Drehzahl n ausgegangen.In Figure 5 schematically shows a pump curve for the feed pump 116, which indicates a delivery head H as a function of the flow rate Q. A constant speed n is assumed.

Ferner eingezeichnet ist die Leistungsaufnahme P (Motorleistung). Die entsprechenden Daten gelten für eine Hocheffizienzpumpe.The power consumption P (motor power) is also shown. The corresponding data apply to a high-efficiency pump.

Die Leistungsaufnahme P steigt mit steigender Fördermenge Q an (Kurve 52). In Figur 5 sind schematisch zwei Punkte eingezeichnet; der Punkt B entspricht einem Zustand, bei dem das Rückschlagventil 32 offen ist. Der Punkt A entspricht einem Zustand mit kleinem Durchsatz, bei dem das Rückschlagventil 32 geschlossen ist. Es ist dabei anzumerken, dass davon ausgegangen werden kann, dass bei Zapfung von Warmwasser aus der Warmwasserleitung 20 bei laufender Förderpumpe 116 diese in der Regel keinen positiven Durchsatz mehr haben wird, sondern einen kleinen negativen Durchsatz. Die Wasserversorgung stellt üblicherweise einen um einen Faktor 30 bis 50 höheren Druck bereit als es dem Differenzdruck der Förderpumpe 116 entspricht. Es kann deshalb davon ausgegangen werden, dass bei Punkt A die Leistungsaufnahme P eigentlich geringer ist als in Figur 5 angedeutet.The power consumption P increases with increasing delivery quantity Q (curve 52). In Figure 5 two points are drawn schematically; the point B corresponds to a state in which the check valve 32 is open. Point A corresponds to a low flow rate condition in which the check valve 32 is closed. It should be noted that it can be assumed that when hot water is drawn from the hot water pipe 20 running feed pump 116 this will usually no longer have a positive throughput, but a small negative throughput. The water supply usually provides a pressure which is 30 to 50 times higher than the differential pressure of the feed pump 116. It can therefore be assumed that at point A the power consumption P is actually lower than in Figure 5 indicated.

Es ist der Zusammenhang zwischen Leistungsaufnahme und Fördermenge (Durchflussmenge) erkennbar, und über die Förderpumpe 116 (über die Auswertungseinrichtung 42 und die Sensoreinrichtung 46) kann bei laufender Förderpumpe 116 eine Zapfung an der Warmwasserleitung 20 erkannt werden.The relationship between the power consumption and the delivery rate (flow rate) can be seen, and a tap on the hot water line 20 can be recognized via the delivery pump 116 (via the evaluation device 42 and the sensor device 46) while the delivery pump 116 is running.

Grundsätzlich ist es auch möglich, dass beispielsweise bei leistungsbegrenzten Förderpumpen auch die Drehzahl anstelle der Leistungsaufnahme (Motorleistung) P überwacht und analysiert wird. Üblicherweise werden Förderpumpen 116 in einem Zirkulationssystem drehzahlgesteuert betrieben, da der Leistungsbereich relativ niedrig ist.In principle, it is also possible, for example in the case of output-limited feed pumps, to also monitor and analyze the speed instead of the power consumption (engine power) P. Feed pumps 116 are usually operated in a circulation system in a speed-controlled manner since the power range is relatively low.

In Figur 6 ist schematisch ein möglicher Zeitverlauf der Temperatur T gezeigt, welche beispielsweise an dem Sensor 142 gemessen wird. Die Kurve 54 gemäß Figur 6 entspricht einem Temperaturverlauf, wenn die Förderpumpe 116 in Betrieb ist. Die Förderpumpe saugt aus dem Warmwassertank 14 warmes Wasser in die Warmwasserleitung 20. Diese wird dadurch erwärmt. Ihre Zirkulationsleitung 24 wird ebenfalls erwärmt. Das die Förderpumpe 116 erreichende Wasser wird mit zunehmender Zeitdauer wärmer, bis die ganze Leitung (Warmwasserleitung 20, Rezirkulationsleitung 24) warm ist und die Temperatur nicht mehr weiter ansteigt.In Figure 6 schematically shows a possible time profile of the temperature T, which is measured, for example, on the sensor 142. The curve 54 according to Figure 6 corresponds to a temperature profile when the feed pump 116 is in operation. The feed pump sucks hot water from the hot water tank 14 into the hot water pipe 20, which is thereby heated. Your circulation line 24 is also heated. The water reaching the feed pump 116 becomes warmer with increasing time until the entire line (hot water line 20, recirculation line 24) is warm and the temperature no longer rises.

Wenn beispielsweise zu einem Zeitpunkt t*, welcher in Figur 6 eingezeichnet ist, eine Zapfung an der Warmwasserleitung 20 erfolgt, das heißt beispielsweise ein Wasserhahn geöffnet wird oder ein Duschkopf geöffnet wird, dann wird das Rückschlagventil 32 geschlossen. Die Förderpumpe 116 wird dann langsam rückwärts durchströmt. Das Rückschlagventil 32 kann dabei über die "kleine" Bypassleitung 34 umgangen werden.For example, if at a time t *, which in Figure 6 is drawn, there is a tap on the hot water pipe 20, that is, for example, a water tap is opened or a shower head is opened, then the check valve 32 is closed. The feed pump 116 is then flows slowly backwards. The check valve 32 can be bypassed via the "small" bypass line 34.

Die Förderpumpe 116 wird dadurch von Wasser durchströmt, da sie kurz zuvor selbst in der Gegenrichtung gefördert hat. Es stellt sich dann ein invertiertes Profil 56 für den Temperaturverlauf ein, wobei in der Regel die Steigung flacher ist als bei der Kurve 54.The feed pump 116 is thus flowed through by water, since it had previously delivered itself in the opposite direction. An inverted profile 56 then arises for the temperature profile, the slope generally being flatter than in curve 54.

Wenn der Inhalt der Leitung/Leitungen zwischen dem Warmwassertank 14 und der Förderpumpe, das heißt zwischen dem zweiten Anschluss 28 und der Förderpumpe 116 aufgebraucht ist, dann strömt Wasser, welches aus dem Warmwassertank 14 stammt.When the contents of the line / lines between the hot water tank 14 and the feed pump, that is to say between the second connection 28 and the feed pump 116, are used up, water flows which comes from the hot water tank 14.

Dieses Wasser strömt dann aus dem Warmwassertank 14 durch die Bypassleitung 34 in der Förderpumpe 116. Dies äußert sich wiederum in Temperaturänderungen, welche durch den Temperatursensor 142 beziehungsweise 146 erfassbar sind. Die Temperatur und auch die Temperaturänderungen hängen von der Position eines Zirkulationseingangs ab und insbesondere auch von dem Ladezustand eines Boilers der Warmwasserbereitstellungseinrichtung 12 ab. Wenn beispielsweise gerade ausgiebig geduscht wurde, dann kann es sein, dass ein unterer Bereich des Warmwassertanks 14 kalt ist und erst wieder erwärmt werden muss. Ist der Warmwassertank 14 voll geladen, dann kann wieder warmes Wasser aus ihm bereitgestellt werden.This water then flows out of the hot water tank 14 through the bypass line 34 in the feed pump 116. This in turn manifests itself in temperature changes which can be detected by the temperature sensor 142 or 146. The temperature and also the temperature changes depend on the position of a circulation input and in particular also on the state of charge of a boiler of the hot water supply device 12. If, for example, a shower has just been taken extensively, then it may be the case that a lower region of the hot water tank 14 is cold and first has to be warmed up again. If the hot water tank 14 is fully charged, then warm water can be provided from it again.

Wenn der zweite Anschluss 28 so positioniert ist, dass beim vorliegenden Ladezustand der Warmwasserbereitstellungseinrichtung 12 warmes Wasser aus dieser austritt, dann steigt die Temperatur stark an (Kurve 58).If the second connection 28 is positioned in such a way that, in the present state of charge of the hot water supply device 12, hot water emerges from it, the temperature rises sharply (curve 58).

Wenn bei einem vorliegenden Ladezustand vor allem kaltes Wasser aus der Warmwasserbereitstellungseinrichtung 12 an dem zweiten Anschluss 28 eintreten kann, dann kann die Temperatur stark absinken (Kurve 60 gemäß Figur 6).If, in the present state of charge, especially cold water from the hot water supply device 12 can enter at the second connection 28, then the temperature can drop sharply (curve 60 according to FIG Figure 6 ).

Der Temperatursensor 142, 146 liefert seine Daten der Auswertungseinrichtung 42, welche den entsprechenden zeitlichen Temperaturverlauf ermittelt.The temperature sensor 142, 146 supplies its data to the evaluation device 42, which determines the corresponding temporal temperature profile.

Wenn eine starke Temperaturänderung insbesondere gemäß den Kurven 58 oder 60 durch die Auswertungseinrichtung 42 erkannt wird, dann ist dies eine Anzeige dafür, dass eine Wasserzapfung erfolgt beziehungsweise erfolgt ist. Es lässt sich dann entsprechend durch Überwachung von Temperaturänderungen durch die Auswertungseinrichtung 42 erkennen, ob eine Wasserzapfung erfolgt ist. Diese Wasserzapfung lässt sich auch detektieren, wenn die Förderpumpe 116 nicht in Betrieb ist.If a strong temperature change is detected by the evaluation device 42, in particular according to curves 58 or 60, then this is an indication that a water tap has taken place or has taken place. It can then be recognized accordingly by monitoring temperature changes by the evaluation device 42 whether water has been drawn off. This water tap can also be detected when the feed pump 116 is not in operation.

Auch die im Vergleich zu den Temperaturänderungen 58, 60 geringere Temperaturänderung 56 lässt sich detektieren. Ein Temperaturverlauf gemäß dem Profil 56 ist ein Anzeichen für eine Zapfung.The lower temperature change 56 compared to the temperature changes 58, 60 can also be detected. A temperature profile according to profile 56 is an indication of a tap.

Erfindungsgemäß wird also eine Wasserzapfung mittels "Bordmitteln" der Förderpumpe 116 erkannt, wenn die Förderpumpe 116 in Betrieb ist, und wenn sie nicht in Betrieb ist. Wenn die Förderpumpe 116 in Betrieb ist, wird insbesondere über eine Änderung der Durchflussmenge Q die Wasserzapfung erkannt. Wenn die Förderpumpe nicht in Betrieb ist, wird aufgrund eines möglichen Rückflusses von Wasser aus dem Warmwassertank 14 durch die Bypassleitung 34 hindurch in die Förderpumpe 116 aufgrund von relativ starken Temperaturänderungen die Wasserzapfung detektiert.According to the invention, a water supply is thus recognized by means of "on-board means" of the feed pump 116 when the feed pump 116 is in operation and when it is not in operation. When the feed pump 116 is in operation, the water tap is recognized in particular by a change in the flow rate Q. When the feed pump is not in operation, water tapping is detected due to a possible backflow of water from the hot water tank 14 through the bypass line 34 into the feed pump 116 due to relatively large temperature changes.

Durch die Pumpenvorrichtung 30 mit der integrierten Sensoreinrichtung mit dem Temperatursensor 142, 146 und die Sensoreinrichtung 46 lässt sich dann unabhängig von dem Betriebszustand der Förderpumpe 16 erkennen, ob eine Wasserzapfung vorliegt oder nicht. Es werden dazu keine Sensoren außerhalb der Pumpenvorrichtung 30 benötigt. Insbesondere wird kein Temperatursensor an der Warmwasserbereitstellungseinrichtung 12 benötigt. Es entfällt dadurch der sonst erforderliche Verkabelungs- und Verschaltungsaufwand.The pump device 30 with the integrated sensor device with the temperature sensor 142, 146 and the sensor device 46 can then be used to determine whether a water tap is present or not, regardless of the operating state of the feed pump 16. No sensors outside the pump device 30 are required for this. In particular, no temperature sensor is required on the hot water supply device 12. This eliminates the otherwise required cabling and wiring.

Durch die Auswertungseinrichtung 42 lässt sich also detektieren, wenn eine Wasserzapfung an der Warmwasserleitung 20 vorliegt, unabhängig von dem Betriebszustand der Förderpumpe 116.The evaluation device 42 can therefore detect when there is a water tap on the hot water line 20, regardless of the operating state of the feed pump 116.

Durch das Zeitglied 50 lässt sich dann bestimmen, wann eine solche Wasserzapfung vorliegt. Die Selbstlerneinrichtung 48 kann dadurch ein Benutzermuster bestimmen, welches eine zeitliche Abhängigkeit der Wasserzapfung ist.The timing element 50 can then be used to determine when such a water tap is present. The self-learning device 48 can thereby determine a user pattern which is a time dependency of the water tap.

Das so ermittelte Benutzermuster kann wiederum dazu verwendet werden, um den Betrieb der Förderpumpe 116 zu steuern beziehungsweise einzustellen beziehungsweise anzupassen. Das ermittelte Benutzermuster wird so verwendet, dass insbesondere in einem bestimmten Zeitabstand (wie beispielsweise 15 Minuten) vor einem erwarteten Zapfzeitpunkt die Förderpumpe betrieben wird, um eine Rezirkulation durchzuführen. Wenn dann ein Benutzer eine Zapfung durchführt, dann erhält er ständig warmes Wasser, das heißt in der Warmwasserleitung 20 befindet sich kein abgekühltes Wasser.The user pattern determined in this way can in turn be used to control, adjust or adapt the operation of the feed pump 116. The determined user pattern is used in such a way that the feed pump is operated in particular at a certain time interval (such as 15 minutes) before an expected tapping time in order to carry out a recirculation. If a user then carries out a tap, then he constantly receives warm water, that is to say there is no cooled water in the hot water line 20.

Es kann ferner nach einer bestimmten Zeitdauer (wie beispielsweise 15 Minuten) nach einem erwarteten Zapfintervall der Betrieb der Förderpumpe 116 abgeschaltet werden, da keine Rezirkulation mehr benötigt wird.Furthermore, the operation of the feed pump 116 can be switched off after a certain period of time (such as 15 minutes) after an expected tapping interval, since no more recirculation is required.

Die Selbstlerneinrichtung 48 generiert aus dem Benutzermuster Steuerdaten für die Motorschaltung 128, um entsprechend zeitlich gesteuert die Förderpumpe 116 zu steuern beziehungsweise einzustellen beziehungsweise anzupassen.The self-learning device 48 generates control data for the motor circuit 128 from the user pattern in order to control, adjust or adapt the feed pump 116 in a time-controlled manner.

Die Selbstlerneinrichtung 48 stellt beispielsweise einen Steueralgorithmus bereit, welcher ein 24-Stunden-Muster und ein überlagertes 7-Tage-Muster aufweist. Dadurch lässt sich über den gesamten Wochenverlauf ein Benutzermuster ermitteln und entsprechend dieses ermittelte Benutzermuster zur Steuerung/Einstellung/Anpassung der Förderpumpe 116 verwenden.The self-learning device 48 provides, for example, a control algorithm which has a 24-hour pattern and a superimposed 7-day pattern. As a result, a user pattern can be determined over the entire course of the week and used in accordance with this determined user pattern for controlling / setting / adapting the feed pump 116.

Beispielsweise wird einem Benutzermuster durch die Selbstlerneinrichtung 48 eine endliche Lebensdauer zugeordnet. Wenn keine Verwendung dieses Benutzermusters detektiert wird, dann wird dieses Benutzermuster bezüglich der Steuerung/Einstellung/Anpassung der Förderpumpe 116 deaktiviert. Wenn beispielsweise über drei Zyklen keine Verwendung des Benutzermusters stattfindet, erfolgt eine solche Deaktivierung. Wenn beispielsweise innerhalb von drei Tagen das Benutzermuster wieder verwendet wird, dann erfolgt eine Reaktivierung. Beispielsweise wird die Lebensdauer bis auf ein Maximum von beispielsweise 30 Tagen verlängert.For example, a self-learning device 48 assigns a finite lifetime to a user pattern. If no use of this user pattern is detected, then this user pattern is deactivated with regard to the control / setting / adaptation of the feed pump 116. If, for example, the user pattern is not used for three cycles, such deactivation takes place. For example, if the user pattern is used again within three days, it is reactivated. For example, the lifespan is extended to a maximum of 30 days, for example.

Es lässt sich dadurch sicherstellen, dass die Förderpumpe 116 singuläre Ereignisse nicht zu oft wiederholt, und dabei ein Basis-Grundmuster adäquat verwendet wird.This makes it possible to ensure that the feed pump 116 does not repeat singular events too often, and that a basic basic pattern is used appropriately.

Die entsprechende Lebensdauersteuerung kann auch für das Sieben-Tage-Muster verwendet werden. Beispielsweise können Benutzermuster für jeden Tag unterschiedlich sein und dabei beispielsweise nach einiger Zeit reguläre Muster für fünf Wochentage auftauchen, wobei die Tage sechs und sieben anderen Benutzermustern folgen können.The corresponding lifespan control can also be used for the seven-day pattern. For example, user patterns can be different for each day and, for example, regular patterns for five days of the week may appear after some time, with days six and seven following other user patterns.

Es ist auch möglich, dass Lebensdauern von Zyklen und die Länge von Operationen der Förderpumpe 116 wählbar sind, um einen "Komfortfaktor" variieren zu können. Je länger Lebenszyklen sind und je länger ein Pumpenbetrieb ist, desto weniger wird heißes Wasser in die Warmwasserleitung 20 ohne Rezirkulation befördert; allerdings ist dann auch der Energieverbrauch höher.It is also possible that cycle lifetimes and the length of operations of the feed pump 116 can be selected in order to be able to vary a "comfort factor". The longer life cycles and the longer a pump is in operation, the less hot water is conveyed into the hot water pipe 20 without recirculation; however, the energy consumption is also higher.

Es kann günstig sein, wenn die Förderpumpe 116 in Betrieb gesetzt wird, sobald eine Temperaturänderung entsprechend der Kurve 58 beziehungsweise 60 detektiert wird, welche auf den Rückfluss von Wasser in die Förderpumpe 116 zurückzuführen ist. Auch eine Temperaturänderung gemäß dem Profil 56 ist detektierbar und ist ein Zeichen für eine Zapfung. Dadurch kann dann verifiziert werden, dass tatsächlich (nach Detektion einer endlichen Durchflussmenge im Pumpenbetrieb) Wasser aus dem Warmwassertank 14 direkt über den zweiten Anschluss 28 in die Förderpumpe 116 gelangt ist.It can be advantageous if the feed pump 116 is started as soon as a temperature change according to curve 58 or 60 is detected, which is due to the backflow of water into the feed pump 116. A temperature change according to profile 56 can also be detected and is a sign of a tap. It can then be verified that actually (after detection of a finite Flow rate in pump operation) water from the hot water tank 14 has reached the feed pump 116 directly via the second connection 28.

Die Förderpumpe 116 kann auch betrieben werden bis die Zapfung gestoppt ist, um die Länge der Warmwasserzapfung zu bestimmen. Die dadurch gewonnenen Ergebnisse kann die Selbstlerneinrichtung 48 in dem Benutzermuster berücksichtigen.The feed pump 116 can also be operated until the tap is stopped to determine the length of the hot water tap. The self-learning device 48 can take the results obtained thereby into account in the user pattern.

Es kann grundsätzlich auch vorkommen, dass auch bei Rückströmung von Wasser aus dem Warmwassertank 14 über den zweiten Anschluss 28 und die Förderpumpe 116 keine Temperaturänderung detektierbar ist, insbesondere wenn die Leitung stromaufwärts der Pumpe 116 genau die gleiche Temperatur aufweist wie die Förderpumpe 116. Für einen Selbstlernalgorithmus ist dies jedoch nebensächlich, da beispielsweise am nächsten Tag das Benutzermuster dann unter vorteilhafteren Bedingungen detektierbar ist.In principle, it can also happen that, even when water flows back from the hot water tank 14 via the second connection 28 and the feed pump 116, no change in temperature can be detected, in particular if the line upstream of the pump 116 has exactly the same temperature as the feed pump 116 However, this is irrelevant to the self-learning algorithm, since, for example, the next day the user pattern can then be detected under more advantageous conditions.

Das thermisch isolierte Gehäuse 150 ermöglicht eine definierte Erkennung der starken Temperaturänderungen (Kurven 58 beziehungsweise 60) aufgrund des Rückflusses von Warmwasser aus dem Warmwassertank 14 über den zweiten Anschluss 28 in die Förderpumpe 116.The thermally insulated housing 150 enables a defined detection of the strong temperature changes (curves 58 or 60) due to the backflow of hot water from the hot water tank 14 via the second connection 28 into the feed pump 116.

Durch die erfindungsgemäße Lösung lässt sich ein Selbstlernverfahren realisieren, bei dem ein Benutzermuster mit Mitteln der Pumpenvorrichtung 30 detektierbar ist. Das Benutzermuster lässt sich detektieren, unabhängig davon, ob die Förderpumpe 116 in Betrieb ist oder nicht. Es ergibt sich bei einfacher Ausbildung der Pumpenvorrichtung 30 und des Brauchwassers eine komfortable und energiesparende Betriebsweise. Ein Benutzermuster lässt sich detektieren und dann auch nutzen, ohne dass bezüglich der Pumpenvorrichtung 30 externe Sensoren vorgesehen werden.The solution according to the invention enables a self-learning method to be implemented in which a user pattern can be detected by means of the pump device 30. The user pattern can be detected regardless of whether the feed pump 116 is in operation or not. With a simple design of the pump device 30 and the process water, a comfortable and energy-saving mode of operation results. A user pattern can be detected and then also used without external sensors being provided with respect to the pump device 30.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
BrauchwassersystemWater system
1212
WarmwasserbereitstellungseinrichtungHot water supply equipment
1414
WarmwassertankHot water tank
1616
Boilerboiler
1818
Zuführungseinrichtungfeeder
2020
WarmwasserleitungHot water pipe
22a22a
Zapfstelletap
22b22b
Zapfstelletap
22c22c
Zapfstelletap
2424
Rezirkulationsleitungrecirculation
2626
Erster AnschlussFirst connection
2828
Zweiter AnschlussSecond connection
3030
Pumpenvorrichtungpump device
3232
Rückschlagventilcheck valve
3434
Bypassleitungbypass line
3636
Kombinationcombination
3838
Erster AnschlussFirst connection
4040
Zweiter AnschlussSecond connection
4242
Auswertungseinrichtungevaluation device
4444
Trägercarrier
4646
Sensoreinrichtungsensor device
4848
SelbstlerneinrichtungEven learning means
5050
Zeitgliedtimer
5252
KurveCurve
5454
KurveCurve
5656
Profilprofile
5858
KurveCurve
6060
KurveCurve
116116
Förderpumpefeed pump
120120
Elektromotorelectric motor
122122
Statorstator
124124
Rotorrotor
126126
Motorgehäusemotor housing
128128
Motorschaltungmotor circuit
130130
Schaltungsgehäusecircuit case
132132
Lagerschalebearing shell
134134
Lagerkörperbearing body
136136
LaufradWheel
138138
Rotationsachseaxis of rotation
140140
Förderraumdelivery chamber
142142
Temperatursensortemperature sensor
144144
Wandungwall
146146
Temperatursensortemperature sensor
150150
Gehäusecasing
151151
Pumpengehäusepump housing

Claims (25)

  1. Pump device for arrangement on a recirculation line (24) of a service water system (10), comprising a delivery pump (116), a check valve (32) and a bypass line (34) for the check valve (32), wherein the bypass line (34) is arranged parallel to the check valve (32), and wherein a combination (36) of check valve (32) and bypass line (34) is arranged in series to the delivery pump (116), the pump device has a first connection (38) which is connected in a fluidly-effective manner to the combination (36) of check valve (32) and bypass line (34) and which serves to connect the pump device (116) to a hot water preparation device (12) and the pump device has a second connection (40) which is connected in a fluidly-effective manner to the delivery pump (116), wherein water flows through the pump device (30) from the second connection (40) to the first connection (38) as delivery fluid during the operation of the delivery pump (116).
  2. Pump device according to claim 1, characterised in that the check valve (32) is arranged and designed such that it connects during water tapping to a hot water line (20) on which the recirculation line (24) is arranged.
  3. Pump device according to any one of the preceding claims, characterised in that the bypass line (34) is arranged and designed such that a throughput of delivery fluid takes place through said bypass line, which is at most 15% of a throughput of delivery fluid through the pump device (30) when the check valve (32) is open and the delivery pump (116) is in operation.
  4. Pump device according to any one of the preceding claims, characterised in that the bypass line (34) has a hydraulic cross-sectional area which lies in the region of between 5% and 15% of a hydraulic cross-sectional area of the recirculation line (24) on which the pump device (30) can be arranged.
  5. Pump device according to any one of the preceding claims, characterised in that the pump device (30) comprises a sensor device (142; 146; 46) and an evaluation device (42), which is connected to the sensor device (142; 146; 46) for signal communication, by means of which it is detectable if water is tapped from a hot water line (20) to which the recirculation line (24) is connected.
  6. Pump device according to claim 5, characterised in that the sensor device (142; 146; 46) is integrated into the delivery pump (116) and is arranged in particular inside a housing (150) of the delivery pump (116).
  7. Pump device according to claim 5 or 6, characterised in that the evaluation device (42) is integrated into the delivery pump (116) and is arranged in particular inside a housing (150) of the delivery pump (116) and is arranged in particular on a support (44) which is a support (44) for a motor circuit (128) of an electric motor (120) of the delivery pump (116) or is connected to such a support (44).
  8. Pump device according to any one of claims 5 to 7, characterised in that the sensor device (142; 146; 46) is arranged and designed and the evaluation device (42) is designed such that the water tapping is detectable both in the case of running delivery pump (116) and in the case of stationary delivery pump (116).
  9. Pump device according to any one of claims 5 to 8, characterised in that the sensor device (46) is arranged and designed and the evaluation device (42) is designed such that in the case of running delivery pump (116) the water tapping is detectable from a change in the flow rate (Q) of delivery fluid through the delivery pump (116) and/or from the absolute flow rate (Q).
  10. Pump device according to claim 9, characterised in that the sensor device (46) comprises a sensor for determining a rotational speed (n) of a rotor (124) of an electric motor (120) of the delivery pump (116) and/or a sensor for determining a power consumption (P) of the electric motor (120) and in that the evaluation device (42) determines the flow rate (Q) from the rotational speed (n) and power consumption (P) of the electric motor (120).
  11. Pump device according to any one of claims 5 to 10, characterised in that the sensor device has at least one temperature sensor (142; 146) which is arranged in particular inside the delivery pump (116).
  12. Pump device according to claim 11, characterised in that the evaluation device (42) monitors temperature signals provided by the at least one temperature sensor (142; 146) and in particular provides a detection signal in the case of a temperature change which displays a return flow of water from the water preparation device (12) through the bypass line (34) into the delivery pump (116), in particular when the delivery pump (116) is not in operation.
  13. Pump device according to claim 12, characterised in that the evaluation device (42) generates a switch-on signal for the delivery pump (116) when the detection signal is generated.
  14. Pump device according to any one of claims 5 to 13, characterised by a self-learning device (48), which, based on a user pattern which is determined by means of the sensor device (142; 146; 46) and evaluation device (42), provides control signals for an operation of the delivery pump (116).
  15. Pump device according to claim 14, characterised in that the self-learning device (48) is coupled to the evaluation device (42).
  16. Pump device according to claim 14 or 15, characterised in that the self-learning device (48) comprises a timer (50) which determines a time period of water tapping and stores corresponding time periods, wherein a control and/or setting and/or adaptation of an operation of the delivery pump (116) takes place according to the stored time periods.
  17. Pump device according to claim 16, characterised in that commissioning of the delivery pump (116) takes place in an interval and in particular a certain interval prior to the stored time periods and/or in that ending of an operation of the delivery pump (116) takes place after an interval and in particular a certain interval at stored time periods.
  18. Pump device according to any one of the preceding claims, characterised in that the delivery pump (116) has a thermally-isolated housing (150).
  19. Service water system, comprising a hot water preparation device (12), a hot water line (20) which is connected to the hot water preparation device (12) and on which at least one tap point (22a) is arranged and a recirculation line (24) which is connected to the hot water line (20) and leads to the hot water preparation device (12), characterised in that a pump device (30) according to any one of the preceding claims is arranged on the recirculation line (24), wherein the pump device (30) is connected with the first connection (38) to the hot water preparation device (12).
  20. Method of operating a service water system (12), comprising a hot water preparation device (12), a hot water line (20) with at least one tap point (22a), and a recirculation line (24), characterised in that a pump device (30) according to any one of claims 1 to 18 is arranged on the recirculation line, wherein the pump device (30) is connected with the first connection (38) to the hot water preparation device (12), wherein tapping of water from the hot water line (20) in the case of running delivery pump (116) is detected by means of determining a flow of delivery fluid through the delivery pump (116) and tapping of water from the hot water line (20) in the case of stationary delivery pump (116) is detected from measured temperature changes in the delivery pump (116), wherein the temperature changes in the delivery pump (116) and in particular inside the delivery pump (116) are caused by water which flows from the hot water preparation device (12) through the bypass line (34) into the delivery pump (116).
  21. Method according to claim 20, characterised in that when temperature changes are detected in the case of a stationary delivery pump (116) the delivery pump (116) is put into operation.
  22. Self-learning method for a delivery pump of a service water system, in the case of which a user pattern is determined in relation to water tapping with the method according to any of claims 20 or 21 and based on the determined pattern a pump operation of the delivery pump (116) is controlled and/or set and/or adapted.
  23. Self-learning method according to claim 22, characterised in that when determining patterns, time periods of the water tapping are stored and a pump operation is initiated in an interval prior to a corresponding stored time period and/or a pump operation is ended in an interval after a corresponding stored time period.
  24. Self-learning method according to claim 22 or 23, characterised in that a determined pattern has a definitive service life and is deactivated in particular after lack of use of the pattern for a certain duration in relation to the operation of the delivery pump (116).
  25. Self-learning method according to any one of claims 22 to 24, characterised in that the pattern has an n hours proportion and a superimposed m days proportion, wherein in particular n = 24 and in particular m = 7.
EP16798445.9A 2015-11-17 2016-11-14 Pump device, service water system, method for operating the service water system and self-learning method for the pump device in the service water system Active EP3377770B1 (en)

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DE102015119883.5A DE102015119883A1 (en) 2015-11-17 2015-11-17 Pump device, process water system, method for operating a service water system and self-learning method for a feed pump of a service water system
PCT/EP2016/077579 WO2017085015A1 (en) 2015-11-17 2016-11-14 Pump device, industrial water system, method for operating an industrial water system, and self-teaching method for a delivery pump in an industrial water system

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IT202000015106A1 (en) * 2020-06-23 2021-12-23 Francesco Zambaldi HOT WATER CIRCULATION SYSTEM, PARTICULARLY FOR SANITARY USE AND ITS INSTALLATION PROCEDURE

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FR2398976A1 (en) * 1977-07-25 1979-02-23 Saunier Duval Domestic hot water system - has instantaneous heater and hot water cylinder mounted in parallel to supply heavy flows together

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US20180347831A1 (en) 2018-12-06
DE102015119883A1 (en) 2017-05-18
EP3377770A1 (en) 2018-09-26
US11221149B2 (en) 2022-01-11
CN108291551B (en) 2020-02-14
WO2017085015A1 (en) 2017-05-26

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