EP3540234A1 - Centrifugal pump assembly and method for moving a valve in a pump assembly - Google Patents
Centrifugal pump assembly and method for moving a valve in a pump assembly Download PDFInfo
- Publication number
- EP3540234A1 EP3540234A1 EP18161525.3A EP18161525A EP3540234A1 EP 3540234 A1 EP3540234 A1 EP 3540234A1 EP 18161525 A EP18161525 A EP 18161525A EP 3540234 A1 EP3540234 A1 EP 3540234A1
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- EP
- European Patent Office
- Prior art keywords
- valve element
- drive motor
- impeller
- switching
- switching position
- 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.)
- Withdrawn
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- 230000007423 decrease Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 235000014676 Phragmites communis Nutrition 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
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- 210000003746 feather Anatomy 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
- F04D15/0016—Control, e.g. regulation, of pumps, pumping installations or systems by using valves mixing-reversing- or deviation valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/0606—Canned motor pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
- F04D15/0022—Control, e.g. regulation, of pumps, pumping installations or systems by using valves throttling valves or valves varying the pump inlet opening or the outlet opening
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0027—Varying behaviour or the very pump
- F04D15/0038—Varying behaviour or the very pump by varying the effective cross-sectional area of flow through the rotor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0066—Control, e.g. regulation, of pumps, pumping installations or systems by changing the speed, e.g. of the driving engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/02—Selection of particular materials
- F04D29/026—Selection of particular materials especially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
- F04D29/4293—Details of fluid inlet or outlet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/46—Fluid-guiding means, e.g. diffusers adjustable
- F04D29/48—Fluid-guiding means, e.g. diffusers adjustable for unidirectional fluid flow in reversible pumps
- F04D29/486—Fluid-guiding means, e.g. diffusers adjustable for unidirectional fluid flow in reversible pumps especially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
- F24D3/105—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system pumps combined with multiple way valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2250/00—Geometry
- F05D2250/50—Inlet or outlet
- F05D2250/51—Inlet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/50—Intrinsic material properties or characteristics
- F05D2300/501—Elasticity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2220/00—Components of central heating installations excluding heat sources
- F24D2220/02—Fluid distribution means
- F24D2220/0207—Pumps
Definitions
- Centrifugal pump units as used, for example, as heating circulation pumps, usually have an electric drive motor and a driven by this impeller, which rotates in a pump housing. Furthermore, it is known to integrate directly into the pump housing a valve element, which makes it possible to switch the flow through the pump unit, which is generated by the impeller, between two flow paths. For this purpose, it is known to move such valve elements as a function of the direction of rotation of the impeller by the flow caused by the impeller. A disadvantage of these arrangements is that a drive motor must be present, which can be selectively driven in two directions of rotation. This requires a corresponding control electronics for driving the drive motor.
- the centrifugal pump assembly according to the invention which may be particularly preferably designed as Bankungsum stiilzpumpenaggregat, has an electric drive motor and an impeller driven by this.
- the impeller is arranged in a pump housing in which a movable valve element is further arranged.
- the valve element is arranged in the pump housing so that it can flow through a flow generated by the impeller, i. h., A flow of the pumped liquid between two switching positions is movable.
- the valve element is designed so that at least a portion of the valve element is movable by a pressure or fluid pressure generated by the impeller in the pump housing from a released position to an abutting position in which it is fixed to a contact surface.
- the contact surface may particularly preferably be an inner surface of the pump housing.
- the centrifugal pump assembly according to the invention also has a control device which serves to control the switching operation of the valve element between said switching positions.
- the control device is designed such that it reduces the speed of the drive motor for moving the valve element from one switching position to another switching position and at a time when the pressure in the pump housing has dropped so far that the valve element is no longer fixed to the contact surface , And the valve element has been moved to the other switching position, the speed of the drive motor increases again.
- This time can be determined in various ways, as set out below. So the time z. B. be determined or detected by a timer or by detecting the actual shift position. A reduction in the speed can mean that the speed is only reduced to a lower speed and the pump unit continues to run at this lower speed.
- the lower speed is a speed at which the impeller on the output side generates a pressure which is below a limit pressure at which the valve element can be moved by the pressure in its adjacent position. That is, the rotational speed is so low that the valve element or the portion of the valve element remains in the released position.
- the drive motor is controlled by the control device so that the drive motor is operated at a speed at which the output side pressure of the impeller is so high that the valve element in the adjacent position is held by the pressure.
- control device and the drive motor are designed so that the drive motor so quickly reaches a sufficiently high speed when switching, that immediately such a high pressure for holding the valve element is achieved in the adjacent position before building a flow is, which could move the valve element from the current switching position.
- a corresponding vote of the drive motor, control device and valve element is selected.
- the control device is designed such that it reduces the speed of the drive motor to zero for moving the valve element from one switching position to another switching position, ie, turns off the drive motor and then or at a time when the pressure in the Pump housing has dropped so far that the valve element is not more is fixed to the contact surface and the valve element has been moved to the other switching position, the drive motor turns on again, ie the speed of the drive motor increases again, in particular increased to the normal operating speed.
- the fact is exploited that the liquid flows in the peripheral region of the impeller and / or in a connected circuit due to their inertia even after switching off the drive motor for a certain time in a circle, whereby the flow thus can move the valve element during leakage ,
- valve element is not moved when starting the drive motor from one switching position to the other switching position, but when turning off or shutting down the speed.
- the control device may be designed such that it increases the rotational speed of the drive motor again after a predetermined period of time. That is, according to this embodiment, the timing for increasing the speed over a predetermined period of time is defined. This period of time extends between the shutdown of the rotational speed or the switching off of the drive motor and the subsequent increase in the rotational speed or the restarting of the drive motor. Such a fixed timing allows a very simple embodiment of the control device.
- the switching can thus take place solely by means of a time control over permanently defined periods of time which are stored in the control device.
- the times for restarting the drive motor or speed increase in other ways, for example via to determine at least one position sensor which detects the actual switching position of the valve element.
- the time periods would thus not be predetermined, but would be detected metrologically.
- a position sensor may be present which detects the switching position of the valve element and is signal-connected to the control device, and the control device may be configured to increase the speed of the drive motor again when the position sensor reaches the desired other Switch position signaled. D. h.,
- the time for restarting the drive motor or speed increase is determined or detected based on the actual switching position of the valve element. The time is reached when the position sensor detects the switchover of the valve element.
- a position sensor can be formed, for example, by a magnet arranged in the valve element whose position is detected by a magnetic sensor or reed contact. A combination of timing and position sensor is conceivable, for example, to ensure increased reliability.
- the drive motor and the control device are configured such that when starting the drive motor, the impeller faster enough pressure to move the portion of the valve element in the applied position as a flow for moving the valve element in a different switching position generated.
- the valve element can be kept as described in the achieved switching position.
- the drive motor and the control device are configured such that when switching off the drive motor of the holding the portion of the valve element in the applied position pressure decreases faster than a flow for moving the valve element in the other switching position. The flow remains preferred due to the inertia still exist for a certain time.
- the control device is designed such that it switches off the drive motor for switching the valve element from a first to a second switching position for a first predetermined period of time and for switching from the second to the first switching position the drive motor for a second predetermined Time, which is longer than the first period, turns off.
- This embodiment is advantageous if the valve element is designed so that it is moved at the reduced speed or in the off state of the drive motor due to the still remaining flow from a first to a second switching position.
- the flow will also decrease and preferably decrease so much that the valve member will move back to its first switch position. If in this first switching position then the speed of the drive motor is increased again or the drive motor is switched on again, the valve element is brought in the first switching position in the applied position by the pressure increase and fixed there for further operation. D. h., The switching position of the valve element is set or selected over the duration of the period for which the speed is reduced or the drive motor is switched off.
- control device and the drive motor are designed such that the drive motor can be operated in only one predetermined direction of rotation.
- D. h. There is no such control device is provided, via which the direction of rotation could be selected.
- it may be a drive motor without speed setting. It may in particular be a drive motor, which is operated at mains frequency. More preferably, the drive motor is an asynchronous motor.
- the invention has the advantage that it can thus be realized with conventional, comparatively simple drive motors without complex control electronics.
- the centrifugal pump assembly has a control device, via which the rotational speed of the drive motor is variable, for example, to be able to realize a lowering of the rotational speed without completely switching off the drive motor.
- the control device can in particular have a frequency converter, via which the drive motor is operated.
- the pump housing has at least one connection, preferably at least two connections, and the valve element is designed such that it opens at least one flow path through the at least one connection in its at least two switching positions to different degrees. If two connections are present, these two connections are opened at different widths in the at least two switching positions. Thereby, a mixing ratio between the two terminals can be varied. Alternatively or additionally becomes special preferably realized a switching of the flow path between the two terminals.
- the two connections can be on the pressure side or the suction side of the centrifugal pump assembly.
- valve element is particularly preferably designed so that it releases a flow path through a first connection in a first switching position and a flow path through a second connection in a second switching position.
- first switching position the flow path is preferably closed by the second connection, while in the second switching position the flow path is closed by the first connection.
- the valve element is rotatably mounted in the pump housing such that it is rotatably movable between the switching positions, wherein preferably the valve element is rotatably mounted in the pump housing about an axis of rotation which is parallel and further preferably aligned with a rotational axis of the impeller extends.
- the valve element extends with a wall or surface parallel to the end face of the impeller and / or circumferentially around the impeller.
- the rotational mobility of the valve element allows for easy adjustment of the valve element, since the valve element by a ring flow, which forms in the peripheral region of the impeller during its rotation, can be moved.
- the ring flow acts in particular on the rotationally mounted valve element via frictional forces.
- the valve element adjoins with at least one wall to a pressure chamber, which surrounds the impeller.
- the valve element thus preferably has at least one flow engagement surface on which the flow generated by the impeller acts to move the valve element, wherein the flow engagement surface preferably surrounds the impeller Flow or pressure chamber limited.
- the fact that the flow attack surface forms a boundary wall of the flow space it is achieved that the flow resistance in the centrifugal pump assembly is not substantially increased, since an already existing boundary wall of the flow space is now formed by the valve element.
- the flow attack surface is preferably shaped such that the flow can exert a force on the wall, in particular parallel to the extension direction of the wall, in order to move along the wall and thus the valve element with the flow.
- structuring or protrusions may be provided on the flow engagement surface for this purpose in order to allow a better force action of the flow on the valve element.
- the valve element has a return means or return element.
- a return means may be formed for example in the form of a spring, a magnet and / or a weight.
- the return means is preferably designed so that it moves the valve element at a standstill of the impeller when no flow acts on the valve element in a predetermined switching position. This can be, for example, the first switching position.
- a return means ensures that, when the drive motor is switched off, when the valve element has moved into its released position, the valve element always automatically moves into a predetermined starting position, namely the predetermined switching position, due to the return means. It can thereby be achieved that even when the drive motor can be driven only in one direction of rotation, the valve element can still be moved back in the opposite direction of rotation.
- the movement in the opposite direction of rotation is then effected by the return means.
- the provision of such a reset element is further preferably realized in combination with the above-described timing for the switching operations.
- the use of a return element allows the Resetting the valve element in a known period of time, so that can be determined over a predetermined period of time in the control device, the time at which the drive motor must be turned on again or the speed must be increased again.
- a force generating means preferably a spring, which acts on the valve element or its at least one portion from the applied position in the released position with force.
- the force generating means thus causes the valve element to be returned to the released position when the pressure in the surrounding area of the impeller is reduced.
- the pressure generated by the impeller and acting on the valve member exceeds a threshold at which the force of the force generating means is overcome, the valve member is moved against the force of the force generating means to the applied position.
- an automatically releasing coupling between the valve element and a contact surface is created.
- an elastic restoring force which is generated in the section itself, serve as a force generating means, which moves the valve element back to its original position.
- the force generating means and the drive motor are matched to each other.
- a sufficient pressure is required.
- the drive motor preferably has a correspondingly adapted start-up behavior in order to be able to reach this pressure in the manner described above so quickly that no sufficient flow builds up to move the valve element into another switching position.
- the power generating in particular a spring, designed so that it applies a sufficiently large force to move the valve element as quickly as possible in pressure drop again in its released position and to ensure in this the mobility of the valve element between the switching positions.
- the control device has at least one signal input or a sensor, from which the control device can receive at least one switching signal. Furthermore, the control device is preferably designed such that it controls the drive motor upon receipt of the switching signal so that the valve element is moved from one switching position to the other switching position. Particularly preferably, the control device is designed so that it then turns off and on again the drive motor for the aforementioned time periods described above, in order to achieve the desired switching position.
- the signal input can be wired or wireless, for example as a radio interface, be formed.
- a signal cable can be passed through a suitable opening or via a suitable connector plug into the interior of an electronics housing, in which the control electronics are arranged.
- this sensor can be designed to detect an event, such as a flow in a line, on the basis of which it is desired to switch over the switching position. This is the case, for example, in heating systems in which, in addition to a building temperature control, the heating of service water should be effected. If a domestic water flow is detected in such a heating system, it is a switching over of a switching valve, for example of the invention Valve element required to open a flow path through a heat exchanger for heating the service water.
- the control device can be arranged in an electronics housing and in the electronics housing, a sensor for generating the switching signal can be arranged, wherein the sensor is a magnetic sensor, which can detect the displacement of a magnetic field generated outside the electronics housing.
- a flow sensor having a moving magnet can be placed directly in the vicinity of the electronics housing or terminal box so that movement of the magnet can be detected by the magnetic sensor.
- a contactless signal transmission into the interior of the electronics housing can be achieved.
- a conventional electronics housing or a conventional terminal box may be used, which does not require an additional opening to supply the signal of a flow sensor to a control device arranged in the interior of the electronics housing.
- the subject matter of the invention is a method for moving a valve element arranged in a centrifugal pump unit.
- This is in particular a centrifugal pump unit according to the preceding description.
- reference is therefore also made to the preceding description of the centrifugal pump unit.
- the method steps described in connection with the centrifugal pump assembly are also preferred embodiments of the method described below.
- the inventive method for moving a valve element in a centrifugal pump assembly is intended for use with a valve element, which is arranged and designed such that it can be moved by a flow generated by an impeller of the centrifugal pump assembly from a switching position to a second switching position. Further, at least a portion of the valve element, more preferably the entire valve element, is movable by a pressure generated by the impeller from a released position to an abutting position in which it is fixed to a contact surface. In the released position, the valve element is movable between the switching positions, while it is fixed in the adjacent position in a switching position against movement in the other switching position.
- the method according to the invention has two essential steps.
- a first step the speed of the drive motor is reduced or the drive motor is completely switched off, whereby the pressure on the output side of the impeller is reduced so much that the valve element or at least a portion of the valve element is no longer fixed in the adjacent position, but in the reached solved position.
- This may, as described above, preferably be achieved by a force generating means acting on the valve member or its described portion.
- the valve element is moved by the flow generated by the impeller from a first to a second switching position. This is done, as described above, preferably by rotation of the valve element.
- a second step the rotational speed of the drive motor is then increased again or the drive motor is switched on again, so that the pressure on the output side of the impeller is increased such that the valve element or its at least one section moves into the applied position and is fixed there by the pressure , D. h., After restarting the drive motor, the valve element is thus fixed in the previously achieved switching position by the contact of the valve element to a contact surface.
- the time to restart the Drive motor or to increase the speed can be determined in the manner described above with reference to the device.
- the drive motor for moving the valve element from the second to the first switching position is turned off until the flow has subsided on the output side of the impeller.
- the valve element by a return element, as described above be moved back into the first switching position.
- This is preferably a movement against a direction of motion caused by the flow during operation of the drive motor.
- the drive motor is put into operation, that on the output side of the impeller builds a pressure which moves the valve element or its at least one section in the applied position, before building up a flow which would move the valve element in the second switching position.
- the drive motor is approached so quickly that immediately builds up such a high pressure that the valve element passes into the applied position before it can be moved out of the reached switching position.
- the drive motor is switched off for a shorter period of time or the speed is reduced for a shorter period of time. In this case, this is a period of time which has such a length that, due to the inertia of the liquid, a flow remains which can move the valve element into the second switching position.
- the time periods can, as described above, be fixed or it is possible to detect the end times of the periods, for example, by detecting the achieved switching position of the valve element. In this regard, reference is made to the above description.
- centrifugal pump unit is for installation in a hydraulic block, ie a hydraulic unit for a heating system, in particular a compact heating system, provided as shown schematically in FIG Fig. 12 is shown.
- the centrifugal pump unit has a pump housing 2 with a motor housing 4 attached thereto.
- an electric drive motor consisting of a stator 6 and a rotor 8 is arranged in a known manner.
- the drive motor shown is designed as a wet-running electric drive motor, in which the rotor space, in which the rotor 8 rotates, is separated from the surrounding stator space, in which the stator 6 is located, by a split pot or a can 10.
- the rotor 8 is rotationally fixed via a rotor shaft 12 connected to an impeller 14.
- a terminal box 16 is arranged, which includes the electrical connections and required electrical and electronic components for controlling the drive motor.
- the pump housing 2 in which the impeller 14 rotates, has two suction ports 18 and 20 and a pressure port 22.
- a rotatable valve element 24 is arranged, which is drum-shaped in this embodiment.
- the valve member 24 serves to selectively establish a flow connection from one of the suction ports 18, 20 to the suction port 26 of the impeller 14.
- the valve element 24 is formed by a cup-shaped lower part 28 and a cover 30. Both are firmly connected.
- the cover 30 has centrally an opening with an annular collar, which forms an inlet pipe 32 which engages in the suction mouth 26 of the impeller 14.
- the lower part 28 is fixed to a bearing sleeve 34. This could also be formed integrally with the lower part.
- the bearing sleeve 34 is supported on the bottom of the pump housing 2 via a spring 36 designed as a compression spring. Thus, the spring 36 presses the valve element 24 in the in Fig. 7 shown detached position.
- the bearing sleeve 34 is also rotatably mounted on a bearing pin 46, which extends in the direction of the longitudinal axis X, starting from the bottom into the interior of the pump housing 2 inside.
- the bearing pin 76 engages in a longitudinally extending hole in the bearing sleeve 34, so that the bearing sleeve 34 is slidably mounted on the bearing pin 46.
- the bearing pin 46 is fixed in the bottom of the pump housing 2.
- the bearing sleeve 34 can slide in addition to the rotational movement in the longitudinal direction X on the bearing pin 46 when the valve element 24th from the in Fig. 7 shown dissolved position in the in Fig. 6 shown applied adjacent position is moved.
- the storage of the bearing sleeve 34 on the bearing pin 46 thus allows both a rotational movement and an axial movement in this embodiment.
- the valve element 24 has in its lower part 28 a switching opening 48, as in 3 and 4 you can see. In the illustrations in 3 and 4 the lid 30 is removed.
- the switching opening 48 is located in the bottom surface of the lower part 28, which extends transversely to the longitudinal or rotational axis X.
- the switching opening 48 is radially spaced from the axis of rotation X, so that it moves on rotation of the valve member 24 about the axis of rotation X on an arcuate path in a different angular position.
- Fig. 3 shows the first switching position of the valve element 24, in which the switching opening 48 covers an inlet opening 50 in the bottom of the pump housing 2.
- the inlet opening 50 is in fluid communication with the suction port 20.
- the switching opening 48 is in register with an inlet opening 52, which is in flow communication with the suction port 8.
- a restoring element in the form of a weight 54 is also arranged or formed.
- the weight 54 is also spaced from the axis of rotation X so that it can generate torque about the axis of rotation X.
- the weight 54 is placed so that it is in the in Fig. 3 shown first switching position in the illustrated installation position of the pump unit is shown below. In the given installation position, the rotation axis X always extends horizontally.
- the valve element 24 has on its outer side a stop element 56 which extends away from the bottom 28 parallel to the longitudinal axis X and in the form of a projection or a rib.
- This stop element 56 occurs in the in Fig. 4 shown second switching position with a second stop member 58 in the form of a solid rib in the interior of the pump housing 2 in Appendix.
- the rotational movement of the valve element 24 is limited so that it does not have the second switching position, which in Fig. 4 is shown, can be turned out.
- valve element 24 In addition to the movement between the two switching positions, the valve element 24, as stated, perform an axial movement along the longitudinal axis X, as in Fig. 6 and 7 is shown.
- the valve member 24 In Fig. 6 the valve member 24 is in an abutting position in which it is pressed by the output pressure generated by the impeller 14 into abutment with the pump housing 2.
- the pressure generated by the impeller 14 acts on the surface of the cover 30 facing the impeller.
- the suction-side pressure of the circulating pump assembly acts on the rear side of the cover 30 in the interior of the valve element 24.
- the lower part 28 comes to an annular shoulder 60 in the interior of the pump housing in tight contact.
- the suction side is sealed against the pressure side by the valve element 24 and the valve element 24 also fixed non-positively in the pump housing 2, so that it can not be rotated between the switching positions.
- the fluid pressure acting on the cover 30 decreases, so that the pressure force is reduced and the spring force of the spring 36 again exceeds this pressure force.
- the valve element 24 moves in the in Fig. 7 shown dissolved position, in which the lower part 28 of the valve element 24 of the paragraph 60th lifts, thus no longer frictionally held on the bottom of the pump housing 2 and can rotate freely between the switching positions.
- the spring 36 and the drive motor are coordinated so that the drive motor generates a pressure which makes it possible to overcome the force of the spring 36 for displacing the valve element 24.
- the spring is dimensioned so that, when the pressure falls below a certain limit, the valve element 34 in the in Fig. 6 can move shown dissolved position.
- a control electronics 62 which controls the switching operation by rotation of the valve element 44.
- the drive motor shown here is a conventional unregulated asynchronous motor, which is not controlled by a frequency converter. Ie. An electronic speed change is not provided. Rather, the control electronics 64 is preferably designed only so that it can turn off the drive motor targeted for certain periods of time.
- the switching operation of the valve element 24 takes place only by switching off the drive motor for predetermined periods of time. Instead of a pure time control, the switching position of the valve element 24 could also be detected in order to determine or define the end of the respectively required time span.
- valve element 24 In the starting position, the valve element 24 is in the in Fig. 3 shown first switching position, since the weight 54, the valve element 24 automatically rotates in this position.
- the drive motor is designed so that when it is switched on in the peripheral region of the impeller 14 directly such a high pressure builds up that the valve element 24 in the in Fig. 6 shown fitting position is pressed and held in this frictionally. D. h., In this state, the impeller promotes fluid through the suction port 20 into the pressure port 22.
- the control electronics 64 now the drive motor for a short period of time off, which is selected so that the pressure in the peripheral region of the impeller 14 is reduced so that the valve element 24 is moved by the spring 36 in the released position, the valve element 24 can be rotated to the second switching position shown.
- the control electronics 64 switch off the drive motor for a second, longer period of time. This period of time is chosen so that not only the pressure in the surrounding area of the impeller 14 is reduced, but also the ring flow decreases so much that the torque caused by the weight 54 is greater and the valve element 24 can turn back to the first switching position. Thereafter, the drive motor can then be put into operation again so that the valve element 24 is held in this switching position by the immediate pressure build-up. Also for this switching operation, the control device can select a pure time control. Alternatively, it is also possible here to actually detect the switching position of the valve element 24.
- the control electronics 64 has a near the outer wall of the terminal box 16 located magnetic sensor 66. This can generate a signal which causes the control electronics 64 to switch the switching positions.
- a tubular element 68 is arranged, in which a movable sensor body 70 is arranged for detecting a flow. If there is no flow through the pipe element 68, the sensor body 70 is held, for example, by a spring element, in which Fig. 9 shown rest position.
- a magnet 72 is arranged in the sensor body 70.
- the magnetic sensor 66 In the in Fig. 9 shown rest position of the magnet 70 is the magnetic sensor 66, which may be, for example, a reed contact, not opposite.
- the sensor body 70 is inserted into the in Fig. 10 shifted position, whereby the magnet 72 comes in a position opposite to the magnetic sensor 66.
- the magnetic sensor 66 detects the magnetic field of the magnet 72 and outputs a switching signal that can cause the valve element 24 to switch.
- the centrifugal pump unit described is used for example in a heating system, as in Fig. 12 is shown.
- the heating system has two circuits, a heating circuit 74, which is used to heat a building and a circle 76 through a secondary heat exchanger 78 for heating domestic water.
- Both the heating circuit 74 and the second circuit 76 branch off from an outlet of a primary heat exchanger 80, which may be formed, for example, by a gas boiler.
- a centrifugal pump unit 82 On the input side of the primary heat exchanger 80, a centrifugal pump unit 82, which corresponds to the preceding centrifugal pump unit, is arranged. From the pressure port 22 of the centrifugal pump unit 82, the heat carrier flows into the primary heat exchanger 80.
- the return of the heating circuit 74th is connected to the suction port 20, while the return from the secondary heat exchanger 78 is connected to the suction port 18.
- the described pipe element 68 is located with the flow monitor, which is formed by the sensor body 70.
- a safety function which can prevent overheating of the primary heat exchanger 80, can be realized. If, for example, all radiator valves in the heating circuit 74 are closed and no more heat is removed, this can be detected by a temperature sensor. If now in this state, the centrifugal pump unit 82 is switched off briefly, the valve member 24 moves back to the second switching position. In this then a cycle on the secondary heat exchanger 78 can be maintained.
- the switching over the valve element takes place on the suction side of the impeller 14.
- the pump housing 2 ' has two pressure ports 22' and only one suction port 18 '.
- the valve element 24 ' is cup-shaped and surrounds the impeller 14, so that the flow generated by the impeller 14 and the pressure generated by the impeller 14 in the interior of the valve element 24' act.
- the valve element 24 ' has inside an inlet port 32', which, as described above, with the suction port of the impeller 14 is engaged.
- a weight 54 ' is arranged in the valve element 24'.
- valve element 24 ' can be pressed by a spring 36 in a released position and pressed against the spring force of the pressure in the interior of the valve element 24' in a voltage applied to the pump housing 2 'position.
- the valve element 24 ' has a switching opening 48' in a rear wall or outer circumferential wall, which is in a switching position with an outlet opening 84 in register, so that a flow path from the interior of the valve element 24 'is given to a first of the pressure ports 22'.
- the switching opening 48 ' In the second switching position, the switching opening 48 'is brought into coincidence with a second outlet opening 84, so that a flow path to the second pressure connection 22' is opened.
- the switching of the valve element 24 'between the switching positions takes place in the same manner as described above with reference to the first embodiment.
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Abstract
Die Erfindung betrifft ein Kreiselpumpenaggregat mit einem elektrischen Antriebsmotor (6, 8), ein von diesem angetriebenen Laufrad (14) sowie einem das Laufrad (14) umgebenden Pumpengehäuse (2), in welchem ein bewegliches Ventilelement (24; 24') derart angeordnet ist, dass das Ventilelement (24; 24') durch eine von dem Laufrad (14) erzeugte Strömung zwischen zwei Schaltstellungen bewegbar ist und dass zumindest ein Abschnitt des Ventilelementes (24; 24') durch einen von dem Laufrad (14) in dem Pumpengehäuse erzeugten Druck von einer gelösten Position in eine anliegende Position bewegbar ist, in welcher es an einer Anlagefläche (60) fixiert ist, wobeieine Steuereinrichtung (64), welche derart ausgebildet ist, dass sie zum Bewegen des Ventilelementes (24; 24') von einer Schaltstellung in eine andere Schaltstellung die Drehzahl des Antriebsmotors (6, 8) reduziert und dann, wenn der Druck in dem Pumpengehäuse (2) soweit abgesunken ist, dass das Ventilelement (24; 24') nicht mehr an der Anlagefläche (60) fixiert ist und das Ventilelement (24; 24') in die andere Schaltstellung bewegt worden ist, die Drehzahl des Antriebsmotors (6, 8) wieder erhöht, sowie ein Verfahren zum Bewegen eines Ventilelementes.The invention relates to a centrifugal pump unit with an electric drive motor (6, 8), an impeller (14) driven by the latter and a pump housing (2) surrounding the impeller (14), in which a movable valve element (24, 24 ') is arranged in that the valve element (24; 24 ') is movable between two switching positions by a flow generated by the impeller (14) and that at least a portion of the valve element (24; 24') is generated by one of the impeller (14) in the pump housing Pressure is movable from a released position to an abutting position in which it is fixed to a contact surface (60), wherein a control device (64) which is designed such that it moves the valve element (24; 24 ') from a switching position reduced in another switching position, the speed of the drive motor (6, 8) and then, when the pressure in the pump housing (2) has dropped so far that the valve element (24, 24 ') no longer at d he contact surface (60) is fixed and the valve element (24; 24 ') has been moved to the other switching position, the speed of the drive motor (6, 8) increases again, and a method for moving a valve element.
Description
Kreiselpumpenaggregate, wie sie beispielsweise als Heizungsumwälzpumpen eingesetzt werden, weisen üblicherweise einen elektrischen Antriebsmotor sowie ein von diesem angetriebenes Laufrad auf, welches in einem Pumpengehäuse rotiert. Ferner ist es bekannt, direkt in das Pumpengehäuse ein Ventilelement zu integrieren, welches es ermöglicht, die Strömung durch das Pumpenaggregat, welche von dem Laufrad erzeugt wird, zwischen zwei Strömungswegen umzuschalten. Dazu ist es bekannt, derartige Ventilelemente in Abhängigkeit der Drehrichtung des Laufrades durch die vom Laufrad verursachte Strömung zu bewegen. Nachteilig bei diesen Anordnungen ist, dass ein Antriebsmotor vorhanden sein muss, welcher gezielt in zwei Drehrichtungen antreibbar ist. Dies erfordert eine entsprechende Steuerelektronik zum Ansteuern des Antriebsmotors.Centrifugal pump units, as used, for example, as heating circulation pumps, usually have an electric drive motor and a driven by this impeller, which rotates in a pump housing. Furthermore, it is known to integrate directly into the pump housing a valve element, which makes it possible to switch the flow through the pump unit, which is generated by the impeller, between two flow paths. For this purpose, it is known to move such valve elements as a function of the direction of rotation of the impeller by the flow caused by the impeller. A disadvantage of these arrangements is that a drive motor must be present, which can be selectively driven in two directions of rotation. This requires a corresponding control electronics for driving the drive motor.
Im Hinblick auf diese Problematik ist es Aufgabe der Erfindung, ein Kreiselpumpenaggregat sowie ein Verfahren zum Ansteuern eines solchen Kreiselpumpenaggregates bereitzustellen, welches die Bewegung eines Ventilelementes auf vereinfachte Weise ermöglicht.In view of this problem, it is an object of the invention to provide a centrifugal pump unit and a method for driving such a centrifugal pump unit, which allows the movement of a valve element in a simplified manner.
Diese Aufgabe wird gelöst durch ein Kreiselpumpenaggregat mit den in Anspruch 1 angegebenen Merkmalen sowie durch ein Verfahren mit den in Anspruch 19 angegebenen Merkmalen. Bevorzugte Ausführungsformen ergeben sich aus den Unteransprüchen, der nachfolgenden Beschreibung sowie den beigefügten Figuren.This object is achieved by a centrifugal pump unit having the features specified in claim 1 and by a method having the features specified in claim 19. Preferred embodiments will become apparent from the subclaims, the following description and the accompanying figures.
Das erfindungsgemäße Kreiselpumpenaggregat, welches besonders bevorzugt als Heizungsumwälzpumpenaggregat ausgebildet sein kann, weist einen elektrischen Antriebsmotor sowie ein von diesem angetriebenes Laufrad auf. Das Laufrad ist in einem Pumpengehäuse angeordnet, in welchem ferner ein bewegliches Ventilelement angeordnet ist. Das Ventilelement ist in dem Pumpengehäuse so angeordnet, dass es durch eine von dem Laufrad erzeugte Strömung, d. h., eine Strömung der geförderten Flüssigkeit zwischen zwei Schaltstellungen bewegbar ist. Ferner ist das Ventilelement so ausgebildet, dass zumindest ein Abschnitt des Ventilelementes durch einen von dem Laufrad in dem Pumpengehäuse erzeugten Druck bzw. Fluiddruck von einer gelösten Position in eine anliegende Position bewegbar ist, in welcher es an einer Anlagefläche fixiert ist. Die Anlagefläche kann besonders bevorzugt eine Innenfläche des Pumpengehäuses sein. Wenn zumindest ein Abschnitt des Ventilelementes an dieser Anlagefläche zur Anlage kommt, gibt es einen reibschlüssigen und/oder formschlüssigen Eingriff zwischen dem Abschnitt und der Anlagefläche, sodass diese als eine Kupplung fungieren, welche eine Drehung des Ventilelementes zwischen den Schaltstellungen verhindert. So kann das Ventilelement druckabhängig im Inneren des Pumpengehäuses fixiert bzw. gehalten werden.The centrifugal pump assembly according to the invention, which may be particularly preferably designed as Heizungsumwälzpumpenaggregat, has an electric drive motor and an impeller driven by this. The impeller is arranged in a pump housing in which a movable valve element is further arranged. The valve element is arranged in the pump housing so that it can flow through a flow generated by the impeller, i. h., A flow of the pumped liquid between two switching positions is movable. Furthermore, the valve element is designed so that at least a portion of the valve element is movable by a pressure or fluid pressure generated by the impeller in the pump housing from a released position to an abutting position in which it is fixed to a contact surface. The contact surface may particularly preferably be an inner surface of the pump housing. When at least a portion of the valve member abuts against this abutment surface, there is frictional and / or positive engagement between the portion and the abutment surface such that they act as a coupling which prevents rotation of the valve member between the shift positions. Thus, the valve element can be fixed or held pressure-dependent in the interior of the pump housing.
Das erfindungsgemäße Kreiselpumpenaggregat weist darüber hinaus eine Steuereinrichtung auf, welche dazu dient, den Umschaltvorgang des Ventilelementes zwischen den genannten Schaltstellungen zu steuern. Die Steuereinrichtung ist derart ausgebildet, dass sie zum Bewegen des Ventilelementes von einer Schaltstellung in eine andere Schaltstellung die Drehzahl des Antriebsmotors reduziert und zu einem Zeitpunkt, wenn der Druck in dem Pumpengehäuse so weit abgesunken ist, dass das Ventilelement nicht mehr an der Anlagefläche fixiert ist, und das Ventilelement in die andere Schaltstellung bewegt worden ist, die Drehzahl des Antriebsmotors wieder erhöht. Dieser Zeitpunkt kann, wie unten dargelegt, auf verschiedene Weise bestimmt bzw. erfasst werden. So kann der Zeitpunkt z. B. durch eine Zeitsteuerung oder durch Erfassen der tatsächlichen Schaltstellung bestimmt bzw. erfasst werden. Eine Reduzierung der Drehzahl kann dabei bedeuten, dass die Drehzahl lediglich auf eine geringere Drehzahl reduziert wird und das Pumpenaggregat mit dieser geringeren Drehzahl weiterläuft. Dabei ist die geringere Drehzahl eine Drehzahl, bei welcher das Laufrad ausgangsseitig einen Druck erzeugt, welcher unterhalb eines Grenzdruckes liegt, bei welchem das Ventilelement durch den Druck in seine anliegende Position bewegt werden kann. D. h., die Drehzahl ist so niedrig, dass das Ventilelement oder der Abschnitt des Ventilelementes in der gelösten Position verbleibt. Um das Ventilelement in einer bestimmten Schaltstellung halten zu können, ist es vorgesehen, dass der Antriebsmotor von der Steuereinrichtung so angesteuert wird, dass der Antriebsmotor mit einer Drehzahl betrieben wird, bei welcher der ausgangsseitige Druck des Laufrades so hoch ist, dass das Ventilelement in der anliegenden Position durch den Druck gehalten wird. Dabei ist es besonders bevorzugt, dass die Steuereinrichtung und der Antriebsmotor so ausgelegt sind, dass der Antriebsmotor beim Einschalten so schnell eine ausreichend hohe Drehzahl erreicht, dass unmittelbar ein derart hoher Druck zum Halten des Ventilelements in der anliegenden Position erreicht wird, bevor eine Strömung aufgebaut wird, welche das Ventilelement aus der momentanen Schaltstellung herausbewegen könnte. D. h., bevorzugt ist eine entsprechende Abstimmung von Antriebsmotor, Steuereinrichtung und Ventilelement gewählt.The centrifugal pump assembly according to the invention also has a control device which serves to control the switching operation of the valve element between said switching positions. The control device is designed such that it reduces the speed of the drive motor for moving the valve element from one switching position to another switching position and at a time when the pressure in the pump housing has dropped so far that the valve element is no longer fixed to the contact surface , And the valve element has been moved to the other switching position, the speed of the drive motor increases again. This time can be determined in various ways, as set out below. So the time z. B. be determined or detected by a timer or by detecting the actual shift position. A reduction in the speed can mean that the speed is only reduced to a lower speed and the pump unit continues to run at this lower speed. In this case, the lower speed is a speed at which the impeller on the output side generates a pressure which is below a limit pressure at which the valve element can be moved by the pressure in its adjacent position. That is, the rotational speed is so low that the valve element or the portion of the valve element remains in the released position. In order to hold the valve element in a specific switching position, it is provided that the drive motor is controlled by the control device so that the drive motor is operated at a speed at which the output side pressure of the impeller is so high that the valve element in the adjacent position is held by the pressure. It is particularly preferred that the control device and the drive motor are designed so that the drive motor so quickly reaches a sufficiently high speed when switching, that immediately such a high pressure for holding the valve element is achieved in the adjacent position before building a flow is, which could move the valve element from the current switching position. D. h., Preferably, a corresponding vote of the drive motor, control device and valve element is selected.
Gemäß einer bevorzugten Ausführungsform der Erfindung ist die Steuereinrichtung derart ausgebildet, dass sie zum Bewegen des Ventilelementes von einer Schaltstellung in eine andere Schaltstellung die Drehzahl des Antriebsmotors auf null reduziert, d. h. den Antriebsmotor ausschaltet und dann bzw. zu einem Zeitpunkt, wenn der Druck in dem Pumpengehäuse so weit abgesunken ist, dass das Ventilelement nicht mehr an der Anlagefläche fixiert ist und das Ventilelement in die andere Schaltstellung bewegt worden ist, den Antriebsmotor wieder einschaltet, d. h. die Drehzahl des Antriebsmotors wieder erhöht, insbesondere auf die normale Betriebsdrehzahl erhöht. Bei dieser Ausführungsvariante wird der Umstand ausgenutzt, dass die Flüssigkeit im Umfangsbereich des Laufrades und/oder in einem angeschlossenen Kreislauf aufgrund ihrer Trägheit auch nach dem Abschalten des Antriebsmotors noch für eine gewisse Zeit im Kreis strömt, wodurch die Strömung somit beim Auslaufen das Ventilelement bewegen kann.According to a preferred embodiment of the invention, the control device is designed such that it reduces the speed of the drive motor to zero for moving the valve element from one switching position to another switching position, ie, turns off the drive motor and then or at a time when the pressure in the Pump housing has dropped so far that the valve element is not more is fixed to the contact surface and the valve element has been moved to the other switching position, the drive motor turns on again, ie the speed of the drive motor increases again, in particular increased to the normal operating speed. In this embodiment, the fact is exploited that the liquid flows in the peripheral region of the impeller and / or in a connected circuit due to their inertia even after switching off the drive motor for a certain time in a circle, whereby the flow thus can move the valve element during leakage ,
Wesentliches Merkmal der vorliegenden Erfindung ist, dass das Ventilelement nicht beim Hochfahren des Antriebsmotors von einer Schaltstellung in die andere Schaltstellung bewegt wird, sondern beim Ausschalten bzw. Herunterfahren der Drehzahl.An essential feature of the present invention is that the valve element is not moved when starting the drive motor from one switching position to the other switching position, but when turning off or shutting down the speed.
Gemäß einer möglichen Ausführungsform der Erfindung kann die Steuereinrichtung derart ausgebildet sein, dass sie die Drehzahl des Antriebsmotors nach einer vorbestimmten Zeitspanne wieder erhöht. D. h., gemäß dieser Ausführungsform wird der Zeitpunkt für die Drehzahlerhöhung über eine vorgegebene Zeitspanne definiert. Diese Zeitspanne erstreckt sich zwischen dem Herunterfahren der Drehzahl bzw. dem Ausschalten des Antriebsmotors und der nachfolgenden Erhöhung der Drehzahl bzw. dem Wiedereinschalten des Antriebsmotors. Eine solche feste Zeitsteuerung ermöglicht eine sehr einfache Ausgestaltung der Steuereinrichtung.According to a possible embodiment of the invention, the control device may be designed such that it increases the rotational speed of the drive motor again after a predetermined period of time. That is, according to this embodiment, the timing for increasing the speed over a predetermined period of time is defined. This period of time extends between the shutdown of the rotational speed or the switching off of the drive motor and the subsequent increase in the rotational speed or the restarting of the drive motor. Such a fixed timing allows a very simple embodiment of the control device.
Wie vorangehend beschrieben, kann somit gemäß einer ersten möglichen Ausführungsform das Umschalten allein durch eine Zeitsteuerung über fest definierte Zeitspannen, welche in der Steuereinrichtung hinterlegt sind, erfolgen. Es ist jedoch auch bei dieser Ausführungsform möglich, die Zeitpunkte zum Wiedereinschalten des Antriebsmotors bzw. zur Drehzahlerhöhung auf andere Weise, beispielsweise über zumindest einen Positionssensor, welcher die tatsächliche Schaltstellung des Ventilelementes erfasst, zu bestimmen. Bei einer solchen Ausführungsform wären die Zeitspannen somit nicht fest vorbestimmt, sondern würden messtechnisch erfasst. Ferner ist es denkbar, die Zeitspannen an bestimmte Betriebszustände anzupassen, beispielsweise auf Grundlage von Messwerten anderer Sensoren im System, welche der Steuereinrichtung zugeführt werden, sodass die Steuereinrichtung die Zeitspannen selbsttätig definieren oder beispielsweise aus einer Vielzahl hinterlegter Zeitspannen auswählen kann.As described above, according to a first possible embodiment, the switching can thus take place solely by means of a time control over permanently defined periods of time which are stored in the control device. However, it is also possible in this embodiment, the times for restarting the drive motor or speed increase in other ways, for example via to determine at least one position sensor which detects the actual switching position of the valve element. In such an embodiment, the time periods would thus not be predetermined, but would be detected metrologically. Furthermore, it is conceivable to adapt the time periods to specific operating states, for example based on measured values of other sensors in the system, which are supplied to the control device, so that the control device can automatically define the time periods or select, for example, from a multiplicity of stored time periods.
Gemäß einer möglichen Ausführungsform der Erfindung kann ein Positionssensor vorhanden sein, welcher die Schaltstellung des Ventilelementes erfasst und mit der Steuereinrichtung signalverbunden ist, und die Steuereinrichtung kann so ausgebildet sein, dass sie die Drehzahl des Antriebsmotors wieder erhöht, wenn der Positionssensor das Erreichen der gewünschten anderen Schaltstellung signalisiert. D. h., gemäß dieser Ausführungsform wird der Zeitpunkt zum Wiedereinschalten des Antriebsmotors bzw. zur Drehzahlerhöhung anhand der tatsächlichen Schaltstellung des Ventilelementes bestimmt bzw. erfasst. Der Zeitpunkt ist erreicht, wenn der Positionssensor das erfolgte Umschalten des Ventilelementes erfasst. Ein solcher Positionssensor kann beispielsweise durch einen in dem Ventilelement angeordneten Magneten, dessen Position von einem Magnetsensor oder Reed-Kontakt erfasst wird, gebildet werden. Auch eine Kombination von Zeitsteuerung und Positionssensor ist denkbar, um beispielsweise eine erhöhte Zuverlässigkeit zu gewährleisten.According to a possible embodiment of the invention, a position sensor may be present which detects the switching position of the valve element and is signal-connected to the control device, and the control device may be configured to increase the speed of the drive motor again when the position sensor reaches the desired other Switch position signaled. D. h., According to this embodiment, the time for restarting the drive motor or speed increase is determined or detected based on the actual switching position of the valve element. The time is reached when the position sensor detects the switchover of the valve element. Such a position sensor can be formed, for example, by a magnet arranged in the valve element whose position is detected by a magnetic sensor or reed contact. A combination of timing and position sensor is conceivable, for example, to ensure increased reliability.
Besonders bevorzugt sind der Antriebsmotor und die Steuereinrichtung derart ausgestaltet, dass beim Anlaufen des Antriebsmotors das Laufrad schneller einen ausreichenden Druck zum Bewegen des Abschnittes des Ventilelements in die anliegende Position als eine Strömung zum Bewegen des Ventilelementes in eine andere Schaltstellung erzeugt. So kann das Ventilelement wie beschrieben in der erreichten Schaltstellung gehalten werden. Weiter bevorzugt sind der Antriebsmotor und die Steuereinrichtung derart ausgestaltet, dass sich beim Abschalten des Antriebsmotors der den Abschnitt des Ventilelementes in der anliegenden Position haltende Druck schneller verringert als eine Strömung zum Bewegen des Ventilelementes in die andere Schaltstellung. Die Strömung bleibt bevorzugt aufgrund der Trägheit noch für eine gewisse Zeit bestehen.Particularly preferably, the drive motor and the control device are configured such that when starting the drive motor, the impeller faster enough pressure to move the portion of the valve element in the applied position as a flow for moving the valve element in a different switching position generated. Thus, the valve element can be kept as described in the achieved switching position. Further preferably, the drive motor and the control device are configured such that when switching off the drive motor of the holding the portion of the valve element in the applied position pressure decreases faster than a flow for moving the valve element in the other switching position. The flow remains preferred due to the inertia still exist for a certain time.
Gemäß einer weiteren möglichen Ausführungsform der Erfindung ist die Steuereinrichtung derart ausgebildet, dass sie zum Umschalten des Ventilelementes von einer ersten in eine zweite Schaltstellung den Antriebsmotor für eine erste vorbestimmte Zeitspanne ausschaltet und zum Umschalten von der zweiten in die erste Schaltstellung den Antriebsmotor für eine zweite vorbestimmte Zeitspanne, welche länger als die erste Zeitspanne ist, ausschaltet. Diese Ausgestaltung ist von Vorteil, wenn das Ventilelement so ausgebildet ist, dass es bei der verringerten Drehzahl oder im ausgeschalteten Zustand des Antriebsmotors aufgrund der noch verbleibenden Strömung von einer ersten in eine zweite Schaltstellung bewegt wird. Wenn das Pumpenaggregat in einer solchen ersten Zeitspanne wieder in Betrieb genommen wird, dass sich das Ventilelement bei der Inbetriebnahme noch in der zweiten Schaltstellung befindet, wird durch die Druckerhöhung das Ventilelement in die anliegende Position gebracht und in der zweiten Schaltstellung fixiert. Wenn jedoch die zweite längere Zeitspanne gewählt wird, wird sich auch die Strömung verringern und vorzugsweise so weit verringern, dass sich das Ventilelement wieder in seine erste Schaltstellung zurückbewegt. Wenn in dieser ersten Schaltstellung dann die Drehzahl des Antriebsmotors wieder erhöht bzw. der Antriebsmotor wieder eingeschaltet wird, wird durch die Druckerhöhung das Ventilelement in der ersten Schaltstellung in die anliegende Position gebracht und dort für den weiteren Betrieb fixiert. D. h., die Schaltstellung des Ventilelementes wird über die Dauer der Zeitspanne, für welche die Drehzahl reduziert bzw. der Antriebsmotor ausgeschaltet wird, eingestellt bzw. gewählt.According to a further possible embodiment of the invention, the control device is designed such that it switches off the drive motor for switching the valve element from a first to a second switching position for a first predetermined period of time and for switching from the second to the first switching position the drive motor for a second predetermined Time, which is longer than the first period, turns off. This embodiment is advantageous if the valve element is designed so that it is moved at the reduced speed or in the off state of the drive motor due to the still remaining flow from a first to a second switching position. When the pump unit is put back into operation in such a first period of time that the valve element is still in the second switching position during startup, the pressure increase causes the valve element to be brought into the adjacent position and fixed in the second switching position. However, if the second longer period of time is selected, the flow will also decrease and preferably decrease so much that the valve member will move back to its first switch position. If in this first switching position then the speed of the drive motor is increased again or the drive motor is switched on again, the valve element is brought in the first switching position in the applied position by the pressure increase and fixed there for further operation. D. h., The switching position of the valve element is set or selected over the duration of the period for which the speed is reduced or the drive motor is switched off.
Gemäß einer bevorzugten Ausführungsform sind die Steuereinrichtung und der Antriebsmotor derart ausgebildet, dass der Antriebsmotor in nur einer vorgegebenen Drehrichtung betreibbar ist. D. h., es ist keine derartige Steuereinrichtung vorgesehen, über welche die Drehrichtung ausgewählt werden könnte. Alternativ oder zusätzlich kann es sich um einen Antriebsmotor ohne Drehzahleinstellung handeln. Es kann sich insbesondere um einen Antriebsmotor handeln, welcher mit Netzfrequenz betrieben wird. Weiter bevorzugt handelt es sich bei dem Antriebsmotor um einen Asynchronmotor. Die Erfindung hat den Vorteil, dass sie sich somit mit konventionellen, vergleichsweise einfach aufgebauten Antriebsmotoren ohne aufwendige Steuer- bzw. Regelelektronik realisieren lässt.According to a preferred embodiment, the control device and the drive motor are designed such that the drive motor can be operated in only one predetermined direction of rotation. D. h., There is no such control device is provided, via which the direction of rotation could be selected. Alternatively or additionally, it may be a drive motor without speed setting. It may in particular be a drive motor, which is operated at mains frequency. More preferably, the drive motor is an asynchronous motor. The invention has the advantage that it can thus be realized with conventional, comparatively simple drive motors without complex control electronics.
Alternativ ist es jedoch möglich, dass das Kreiselpumpenaggregat eine Steuereinrichtung aufweist, über welche die Drehzahl des Antriebsmotors veränderbar ist, beispielsweise, um ein Absenken der Drehzahl ohne vollständiges Ausschalten des Antriebsmotors realisieren zu können. Die Steuereinrichtung kann hierzu insbesondere einen Frequenzumrichter aufweisen, über welche der Antriebsmotor betrieben wird.Alternatively, however, it is possible that the centrifugal pump assembly has a control device, via which the rotational speed of the drive motor is variable, for example, to be able to realize a lowering of the rotational speed without completely switching off the drive motor. For this purpose, the control device can in particular have a frequency converter, via which the drive motor is operated.
Gemäß einer weiteren möglichen Ausführungsform der Erfindung weist das Pumpengehäuse zumindest einen Anschluss, vorzugsweise zumindest zwei Anschlüsse auf und das Ventilelement ist derart ausgebildet, dass es in seinen zumindest zwei Schaltstellungen zumindest einen Strömungsweg durch den zumindest einen Anschluss unterschiedlich weit öffnet. Wenn zwei Anschlüsse vorhanden sind, werden diese zwei Anschlüsse in den zumindest zwei Schaltstellungen unterschiedlich weit geöffnet. Dadurch kann ein Mischungsverhältnis zwischen den beiden Anschlüssen variiert werden. Alternativ oder zusätzlich wird besonders bevorzugt ein Umschalten des Strömungsweges zwischen den beiden Anschlüssen realisiert. Dabei können die beiden Anschlüsse auf der Druckseite oder der Saugseite des Kreiselpumpenaggregates liegen.According to another possible embodiment of the invention, the pump housing has at least one connection, preferably at least two connections, and the valve element is designed such that it opens at least one flow path through the at least one connection in its at least two switching positions to different degrees. If two connections are present, these two connections are opened at different widths in the at least two switching positions. Thereby, a mixing ratio between the two terminals can be varied. Alternatively or additionally becomes special preferably realized a switching of the flow path between the two terminals. The two connections can be on the pressure side or the suction side of the centrifugal pump assembly.
So ist das Ventilelement besonders bevorzugt so ausgebildet, dass es in einer ersten Schaltstellung einen Strömungsweg durch einen ersten Anschluss und in einer zweiten Schaltstellung einen Strömungsweg durch einen zweiten Anschluss freigibt. Dabei ist in der ersten Schaltstellung vorzugsweise der Strömungsweg durch den zweiten Anschluss verschlossen, während in der zweiten Schaltstellung der Strömungsweg durch den ersten Anschluss verschlossen ist.Thus, the valve element is particularly preferably designed so that it releases a flow path through a first connection in a first switching position and a flow path through a second connection in a second switching position. In the first switching position, the flow path is preferably closed by the second connection, while in the second switching position the flow path is closed by the first connection.
Gemäß einer weiteren möglichen Ausführungsform der Erfindung ist das Ventilelement in dem Pumpengehäuse derart drehbar gelagert, dass es zwischen den Schaltstellungen drehend bewegbar ist, wobei vorzugsweise das Ventilelement in dem Pumpengehäuse um eine Drehachse drehbar gelagert ist, welche sich parallel und weiter bevorzugt fluchtend zu einer Drehachse des Laufrades erstreckt. Besonders bevorzugt erstreckt sich das Ventilelement mit einer Wandung oder Fläche parallel zur Stirnseite des Laufrades und/oder umfänglich um das Laufrad. Die Drehbeweglichkeit des Ventilelementes ermöglicht eine leichte Verstellung des Ventilelementes, da das Ventilelement durch eine Ringströmung, welche sich im Umfangsbereich des Laufrades bei dessen Rotation ausbildet, bewegt werden kann. Die Ringströmung wirkt insbesondere über Reibungskräfte auf das drehend gelagerte Ventilelement. Das Ventilelement grenzt dazu mit zumindest einer Wandung an einen Druckraum an, welcher das Laufrad umgibt.According to another possible embodiment of the invention, the valve element is rotatably mounted in the pump housing such that it is rotatably movable between the switching positions, wherein preferably the valve element is rotatably mounted in the pump housing about an axis of rotation which is parallel and further preferably aligned with a rotational axis of the impeller extends. Particularly preferably, the valve element extends with a wall or surface parallel to the end face of the impeller and / or circumferentially around the impeller. The rotational mobility of the valve element allows for easy adjustment of the valve element, since the valve element by a ring flow, which forms in the peripheral region of the impeller during its rotation, can be moved. The ring flow acts in particular on the rotationally mounted valve element via frictional forces. The valve element adjoins with at least one wall to a pressure chamber, which surrounds the impeller.
Das Ventilelement weist vorzugsweise somit zumindest eine Strömungsangriffsfläche auf, auf welche die von dem Laufrad erzeugte Strömung zur Bewegung des Ventilelementes wirkt, wobei die Strömungsangriffsfläche vorzugsweise einen das Laufrad umgebenden Strömungs- bzw. Druckraum begrenzt. Dadurch, dass die Strömungsangriffsfläche eine Begrenzungswand des Strömungsraumes bildet, wird erreicht, dass der Strömungswiderstand in dem Kreiselpumpenaggregat im Wesentlichen nicht erhöht wird, da eine ohnehin vorhandene Begrenzungswandung des Strömungsraumes nun durch das Ventilelement gebildet wird. Die Strömungsangriffsfläche ist bevorzugt so geformt, dass die Strömung eine Kraft auf die Wandung, insbesondere parallel zur Erstreckungsrichtung der Wandung ausüben kann, um die Wandung und damit das Ventilelement mit der Strömung mitzubewegen. Gegebenenfalls können hierzu Strukturierungen oder Vorsprünge an der Strömungsangriffsfläche vorgesehen sein, um eine bessere Krafteinwirkung der Strömung auf das Ventilelement zu ermöglichen.The valve element thus preferably has at least one flow engagement surface on which the flow generated by the impeller acts to move the valve element, wherein the flow engagement surface preferably surrounds the impeller Flow or pressure chamber limited. The fact that the flow attack surface forms a boundary wall of the flow space, it is achieved that the flow resistance in the centrifugal pump assembly is not substantially increased, since an already existing boundary wall of the flow space is now formed by the valve element. The flow attack surface is preferably shaped such that the flow can exert a force on the wall, in particular parallel to the extension direction of the wall, in order to move along the wall and thus the valve element with the flow. Optionally, structuring or protrusions may be provided on the flow engagement surface for this purpose in order to allow a better force action of the flow on the valve element.
Besonders bevorzugt weist das Ventilelement ein Rückstellmittel bzw. Rückstellelement auf. Ein solches Rückstellmittel kann beispielsweise in Form einer Feder, eines Magneten und/oder eines Gewichtes ausgebildet sein. Das Rückstellmittel ist vorzugsweise so ausgebildet, dass es das Ventilelement bei Stillstand des Laufrades, wenn keine Strömung auf das Ventilelement wirkt, in eine vorbestimmte Schaltstellung bewegt. Dies kann beispielsweise die erste Schaltstellung sein. Durch solch ein Rückstellmittel wird erreicht, dass sich beim Ausschalten des Antriebsmotors, wenn sich das Ventilelement in seine gelöste Position bewegt hat, das Ventilelement stets selbsttätig aufgrund des Rückstellmittels in eine vorbestimmte Ausgangslage, nämlich die genannte vorbestimmte Schaltstellung bewegt. Dadurch kann erreicht werden, dass auch dann, wenn der Antriebsmotor nur in einer Drehrichtung antreibbar ist, das Ventilelement dennoch in entgegengesetzter Drehrichtung zurückbewegt werden kann. Die Bewegung in der entgegengesetzten Drehrichtung wird dann durch das Rückstellmittel bewirkt. Die Rückstellung über ein solches Rückstellelement ist ferner bevorzugt in Kombination mit der oben beschriebenen Zeitsteuerung für die Umschaltvorgänge realisiert. Die Verwendung eines Rückstellelementes ermöglicht die Rückstellung des Ventilelementes in einer bekannten Zeitspanne, sodass sich über eine vorbestimmte Zeitspanne in der Steuereinrichtung der Zeitpunkt bestimmen lässt, zu welchem der Antriebsmotor wieder eingeschaltet bzw. die Drehzahl wieder erhöht werden muss.Particularly preferably, the valve element has a return means or return element. Such a return means may be formed for example in the form of a spring, a magnet and / or a weight. The return means is preferably designed so that it moves the valve element at a standstill of the impeller when no flow acts on the valve element in a predetermined switching position. This can be, for example, the first switching position. Such a return means ensures that, when the drive motor is switched off, when the valve element has moved into its released position, the valve element always automatically moves into a predetermined starting position, namely the predetermined switching position, due to the return means. It can thereby be achieved that even when the drive motor can be driven only in one direction of rotation, the valve element can still be moved back in the opposite direction of rotation. The movement in the opposite direction of rotation is then effected by the return means. The provision of such a reset element is further preferably realized in combination with the above-described timing for the switching operations. The use of a return element allows the Resetting the valve element in a known period of time, so that can be determined over a predetermined period of time in the control device, the time at which the drive motor must be turned on again or the speed must be increased again.
Gemäß einer weiteren möglichen Ausführungsform der Erfindung ist ein Krafterzeugungsmittel, vorzugsweise eine Feder, vorhanden, welche das Ventilelement oder dessen zumindest einen Abschnitt aus der anliegenden Position in die gelöste Position mit Kraft beaufschlagt. Das Krafterzeugungsmittel bewirkt somit, dass bei Verringerung des Druckes im Umgebungsbereich des Laufrades das Ventilelement in die gelöste Stellung zurückbewegt wird. Wenn der Druck, welcher von dem Laufrad erzeugt wird und auf das Ventilelement wirkt, einen Grenzwert übersteigt, bei welchem die Kraft des Krafterzeugungsmittels überwunden wird, wird das Ventilelement gegen die Kraft des Krafterzeugungsmittels in die anliegende Position bewegt. So wird eine selbsttätig lösende Kupplung zwischen dem Ventilelement und einer Anlagefläche geschaffen. Im Falle, dass nur ein Abschnitt des Ventilelementes beweglich ist, kann bei elastischer Ausgestaltung dieses Abschnittes auch eine elastische Rückstellkraft, welche in dem Abschnitt selber erzeugt wird, als Krafterzeugungsmittel dienen, welches das Ventilelement in seine Ausgangslage zurückbewegt.According to another possible embodiment of the invention, a force generating means, preferably a spring, is provided, which acts on the valve element or its at least one portion from the applied position in the released position with force. The force generating means thus causes the valve element to be returned to the released position when the pressure in the surrounding area of the impeller is reduced. When the pressure generated by the impeller and acting on the valve member exceeds a threshold at which the force of the force generating means is overcome, the valve member is moved against the force of the force generating means to the applied position. Thus, an automatically releasing coupling between the valve element and a contact surface is created. In the case that only a portion of the valve element is movable, with elastic configuration of this section also an elastic restoring force, which is generated in the section itself, serve as a force generating means, which moves the valve element back to its original position.
Bevorzugt sind das Krafterzeugungsmittel und der Antriebsmotor aufeinander abgestimmt. Um zu erreichen, dass das Ventilelement gegen das Krafterzeugungsmittel in seine anliegende Position bewegt wird, ist, wie beschrieben, ein ausreichender Druck erforderlich. Damit dieser schnell erreicht werden kann, weist der Antriebsmotor bevorzugt ein entsprechend angepasstes Anlaufverhalten auf, um diesen Druck in der oben beschriebenen Weise so schnell erreichen zu können, dass sich noch keine ausreichende Strömung aufbaut, um das Ventilelement in eine andere Schaltstellung zu bewegen. Umgekehrt ist das Krafterzeugungsmittel, insbesondere eine Feder, so ausgelegt, dass es eine ausreichend große Kraft aufbringt, um das Ventilelement bei Druckabfall möglichst schnell wieder in seine gelöste Position zu bewegen und in dieser die Beweglichkeit des Ventilelementes zwischen den Schaltstellungen zu gewährleisten.Preferably, the force generating means and the drive motor are matched to each other. In order to achieve that the valve element is moved against the force generating means in its adjacent position, as described, a sufficient pressure is required. So that this can be achieved quickly, the drive motor preferably has a correspondingly adapted start-up behavior in order to be able to reach this pressure in the manner described above so quickly that no sufficient flow builds up to move the valve element into another switching position. Conversely, the power generating in particular a spring, designed so that it applies a sufficiently large force to move the valve element as quickly as possible in pressure drop again in its released position and to ensure in this the mobility of the valve element between the switching positions.
Gemäß einer weiteren möglichen Ausführungsform der Erfindung weist die Steuereinrichtung zumindest einen Signaleingang oder einen Sensor auf, von welchen die Steuereinrichtung zumindest ein Schaltsignal empfangen kann. Ferner ist die Steuereinrichtung bevorzugt so ausgestaltet, dass sie bei Empfang des Schaltsignals den Antriebsmotor so steuert, dass das Ventilelement von einer Schaltstellung in die andere Schaltstellung bewegt wird. Besonders bevorzugt ist die Steuereinrichtung so ausgebildet, dass sie dann den Antriebsmotor für die oben beschriebenen vorgenannten Zeitspannen aus- und wieder einschaltet, um die gewünschte Schaltstellung zu erreichen. Der Signaleingang kann drahtgebunden oder drahtlos, beispielsweise als Funkschnittstelle, ausgebildet sein. Ein Signalkabel kann durch eine geeignete Öffnung oder über einen geeigneten Anschlussstecker in das Innere eines Elektronikgehäuses, in welchem die Steuerelektronik angeordnet ist, geführt werden. Besonders bevorzugt könnte ein Signalkabel durch dieselbe Öffnung, durch welche ein elektrisches Anschlusskabel in das Elektronikgehäuse bzw. einen Klemmenkasten geführt ist, geführt werden. Wenn die Steuereinrichtung einen Sensor aufweist, so kann dieser Sensor dazu ausgebildet sein, ein Ereignis wie beispielsweise eine Strömung in einer Leitung zu erfassen, aufgrund welcher ein Umschalten der Schaltstellung gewünscht ist. Dies ist beispielsweise in Heizungsanlagen der Fall, in welchen neben einer Gebäudetemperierung auch das Erwärmen von Brauchwasser bewirkt werden soll. Wird in einer solchen Heizungsanlage eine Brauchwasserströmung erfasst, ist ein Umschalten eines Umschaltventils, beispielsweise des erfindungsgemäßen Ventilelementes, erforderlich, um einen Strömungsweg durch einen Wärmetauscher zum Erwärmen des Brauchwassers zu öffnen.According to a further possible embodiment of the invention, the control device has at least one signal input or a sensor, from which the control device can receive at least one switching signal. Furthermore, the control device is preferably designed such that it controls the drive motor upon receipt of the switching signal so that the valve element is moved from one switching position to the other switching position. Particularly preferably, the control device is designed so that it then turns off and on again the drive motor for the aforementioned time periods described above, in order to achieve the desired switching position. The signal input can be wired or wireless, for example as a radio interface, be formed. A signal cable can be passed through a suitable opening or via a suitable connector plug into the interior of an electronics housing, in which the control electronics are arranged. Particularly preferred could a signal cable through the same opening through which an electrical connection cable is guided in the electronics housing or a terminal box, are performed. If the control device has a sensor, then this sensor can be designed to detect an event, such as a flow in a line, on the basis of which it is desired to switch over the switching position. This is the case, for example, in heating systems in which, in addition to a building temperature control, the heating of service water should be effected. If a domestic water flow is detected in such a heating system, it is a switching over of a switching valve, for example of the invention Valve element required to open a flow path through a heat exchanger for heating the service water.
Besonders bevorzugt kann die Steuereinrichtung in einem Elektronikgehäuse angeordnet sein und in dem Elektronikgehäuse kann ein Sensor zum Erzeugen des Schaltsignals angeordnet sein, wobei der Sensor ein Magnetsensor ist, welcher die Verlagerung eines außerhalb des Elektronikgehäuses erzeugten Magnetfeldes erfassen kann. Bei einer solchen Ausgestaltung kann ein Strömungssensor, welcher einen sich bewegenden Magneten aufweist, direkt in der Nähe des Elektronikgehäuses bzw. Klemmenkastens so platziert werden, dass eine Bewegung des Magneten von dem Magnetsensor erfasst werden kann. So kann eine kontaktlose Signalübertragung in das Innere des Elektronikgehäuses hinein erreicht werden. Ferner kann ein konventionelles Elektronikgehäuse bzw. ein konventioneller Klemmenkasten verwendet werden, welcher keine zusätzliche Öffnung benötigt, um das Signal eines Strömungssensors einer in dem Inneren des Elektronikgehäuses angeordneten Steuereinrichtung zuzuführen.Particularly preferably, the control device can be arranged in an electronics housing and in the electronics housing, a sensor for generating the switching signal can be arranged, wherein the sensor is a magnetic sensor, which can detect the displacement of a magnetic field generated outside the electronics housing. In such an embodiment, a flow sensor having a moving magnet can be placed directly in the vicinity of the electronics housing or terminal box so that movement of the magnet can be detected by the magnetic sensor. Thus, a contactless signal transmission into the interior of the electronics housing can be achieved. Furthermore, a conventional electronics housing or a conventional terminal box may be used, which does not require an additional opening to supply the signal of a flow sensor to a control device arranged in the interior of the electronics housing.
Neben dem vorangehend beschriebenen Kreiselpumpenaggregat ist Gegenstand der Erfindung ein Verfahren zum Bewegen eines in einem Kreiselpumpenaggregat angeordneten Ventilelementes. Dabei handelt es sich insbesondere um ein Kreiselpumpenaggregat gemäß der vorangehenden Beschreibung. Hinsichtlich bevorzugter Merkmale des Verfahrens wird somit auch auf die vorangehende Beschreibung des Kreiselpumpenaggregates verwiesen. Die im Zusammenhang mit dem Kreiselpumpenaggregat beschriebenen Verfahrensschritte sind ebenfalls bevorzugte Ausführungsformen des nachfolgend beschriebenen Verfahrens.In addition to the above-described centrifugal pump unit, the subject matter of the invention is a method for moving a valve element arranged in a centrifugal pump unit. This is in particular a centrifugal pump unit according to the preceding description. With regard to preferred features of the method, reference is therefore also made to the preceding description of the centrifugal pump unit. The method steps described in connection with the centrifugal pump assembly are also preferred embodiments of the method described below.
Das erfindungsgemäße Verfahren zum Bewegen eines Ventilelementes in einem Kreiselpumpenaggregat ist vorgesehen zur Verwendung mit einem Ventilelement, welches so angeordnet und ausgebildet ist, dass es durch eine von einem Laufrad des Kreiselpumpenaggregates erzeugte Strömung von einer Schaltstellung in eine zweite Schaltstellung bewegbar ist. Ferner ist zumindest ein Abschnitt des Ventilelementes, besonders bevorzugt das gesamte Ventilelement, durch einen von dem Laufrad erzeugten Druck von einer gelösten Position in eine anliegende Position bewegbar, in welcher es an einer Anlagefläche fixiert ist. In der gelösten Position ist das Ventilelement zwischen den Schaltstellungen bewegbar, während es in der anliegenden Position in einer Schaltstellung gegen Bewegung in die andere Schaltstellung fixiert ist.The inventive method for moving a valve element in a centrifugal pump assembly is intended for use with a valve element, which is arranged and designed such that it can be moved by a flow generated by an impeller of the centrifugal pump assembly from a switching position to a second switching position. Further, at least a portion of the valve element, more preferably the entire valve element, is movable by a pressure generated by the impeller from a released position to an abutting position in which it is fixed to a contact surface. In the released position, the valve element is movable between the switching positions, while it is fixed in the adjacent position in a switching position against movement in the other switching position.
Das erfindungsgemäße Verfahren weist zwei wesentliche Schritte auf. In einem ersten Schritt wird die Drehzahl des Antriebsmotors reduziert oder der Antriebsmotor wird vollständig ausgeschaltet, wodurch der Druck ausgangsseitig des Laufrades so weit reduziert wird, dass das Ventilelement oder der zumindest eine Abschnitt des Ventilelementes nicht mehr in der anliegenden Position fixiert ist, sondern in die gelöste Position gelangt. Dies kann, wie oben beschrieben, vorzugsweise durch ein Krafterzeugungsmittel, welches auf das Ventilelement oder dessen beschriebenen Abschnitt wirkt, erreicht werden. In der gelösten Position wird das Ventilelement durch die von dem Laufrad erzeugte Strömung aus einer ersten in eine zweite Schaltstellung bewegt. Dies erfolgt, wie oben beschrieben, vorzugsweise durch Drehung des Ventilelementes. In einem zweiten Schritt wird dann die Drehzahl des Antriebsmotors wieder erhöht bzw. wird der Antriebsmotor wieder eingeschaltet, sodass der Druck ausgangsseitig des Laufrades derart erhöht wird, dass das Ventilelement oder dessen zumindest einer Abschnitt in die anliegende Position bewegt und dort durch den Druck fixiert wird. D. h., nach Wiedereinschalten des Antriebsmotors wird das Ventilelement somit in der zuvor erreichten Schaltstellung durch die Anlage des Ventilelementes an einer Anlagefläche fixiert. Der Zeitpunkt zum Wiedereinschalten des Antriebsmotors bzw. zur Erhöhung der Drehzahl kann in der oben anhand der Vorrichtung beschriebenen Weise bestimmt werden.The method according to the invention has two essential steps. In a first step, the speed of the drive motor is reduced or the drive motor is completely switched off, whereby the pressure on the output side of the impeller is reduced so much that the valve element or at least a portion of the valve element is no longer fixed in the adjacent position, but in the reached solved position. This may, as described above, preferably be achieved by a force generating means acting on the valve member or its described portion. In the released position, the valve element is moved by the flow generated by the impeller from a first to a second switching position. This is done, as described above, preferably by rotation of the valve element. In a second step, the rotational speed of the drive motor is then increased again or the drive motor is switched on again, so that the pressure on the output side of the impeller is increased such that the valve element or its at least one section moves into the applied position and is fixed there by the pressure , D. h., After restarting the drive motor, the valve element is thus fixed in the previously achieved switching position by the contact of the valve element to a contact surface. The time to restart the Drive motor or to increase the speed can be determined in the manner described above with reference to the device.
Gemäß einer bevorzugten Ausführungsform des Verfahrens wird der Antriebsmotor zum Bewegen des Ventilelementes aus der zweiten in die erste Schaltstellung solange ausgeschaltet, bis die Strömung ausgangsseitig des Laufrades abgeklungen ist. In diesem Zustand kann das Ventilelement durch ein Rückstellelement, wie es oben beschrieben wurde, in die erste Schaltstellung zurückbewegt werden. Dies ist bevorzugt eine Bewegung entgegen einer von der Strömung bei Betrieb des Antriebsmotors verursachten Bewegungsrichtung. Anschließend wird der Antriebsmotor so in Betrieb genommen, dass sich ausgangsseitig des Laufrades ein Druck aufbaut, welcher das Ventilelement oder dessen zumindest einen Abschnitt in die anliegende Position bewegt, bevor sich eine Strömung aufbaut, welche das Ventilelement in die zweite Schaltstellung bewegen würde. D. h., der Antriebsmotor wird so schnell angefahren, dass sich unmittelbar ein derart hoher Druck aufbaut, dass das Ventilelement in die anliegende Position gelangt, bevor es aus der erreichten Schaltstellung heraus bewegt werden kann. Um das Ventilelement aus der ersten in die zweite Schaltstellung zu bewegen, wird der Antriebsmotor für eine kürzere Zeitspanne abgeschaltet bzw. es wird die Drehzahl für eine kürzere Zeitspanne reduziert. Dabei ist dies eine Zeitspanne, welche eine derartige Länge hat, dass aufgrund der Trägheit der Flüssigkeit eine Strömung verbleibt, welche das Ventilelement in die zweite Schaltstellung bewegen kann. Die Zeitspannen können, wie oben beschrieben, fest vorgegeben sein oder es ist möglich, die End-Zeitpunkte der Zeitspannen beispielsweise durch Erfassen der erreichten Schaltstellung des Ventilelementes zu erfassen. Diesbezüglich wird auf die obige Beschreibung verwiesen. Nach Erreichen der zweiten Schaltstellung wird der Antriebsmotor in Betrieb genommen bzw. wird die Drehzahl des Antriebsmotors erhöht, bevor die Strömung nachlässt und das Ventilelement sich wieder in die erste Schaltstellung zurückbewegen kann. Dadurch wird in der zweiten Schaltstellung ein derart hoher Druck aufgebaut, dass das Ventilelement vorzugsweise wieder in die anliegende Position gelangt. In dieser Position wird der Antriebsmotor dann zum normalen Betrieb des Umwälzpumpenaggregates weiter angetrieben.According to a preferred embodiment of the method, the drive motor for moving the valve element from the second to the first switching position is turned off until the flow has subsided on the output side of the impeller. In this state, the valve element by a return element, as described above, be moved back into the first switching position. This is preferably a movement against a direction of motion caused by the flow during operation of the drive motor. Subsequently, the drive motor is put into operation, that on the output side of the impeller builds a pressure which moves the valve element or its at least one section in the applied position, before building up a flow which would move the valve element in the second switching position. D. h., The drive motor is approached so quickly that immediately builds up such a high pressure that the valve element passes into the applied position before it can be moved out of the reached switching position. In order to move the valve element from the first to the second switching position, the drive motor is switched off for a shorter period of time or the speed is reduced for a shorter period of time. In this case, this is a period of time which has such a length that, due to the inertia of the liquid, a flow remains which can move the valve element into the second switching position. The time periods can, as described above, be fixed or it is possible to detect the end times of the periods, for example, by detecting the achieved switching position of the valve element. In this regard, reference is made to the above description. After reaching the second switching position of the drive motor is put into operation or the speed of the drive motor is increased before the flow decreases and the valve element to move back into the first switching position can. As a result, such a high pressure is built up in the second switching position that the valve element preferably returns to the adjacent position. In this position, the drive motor is then further driven to normal operation of the circulation pump unit.
Nachfolgend wird die Erfindung beispielhaft anhand der beigefügten Figuren beschrieben. In diesen zeigt:
- Fig. 1
- eine perspektivische Ansicht eines erfindungsgemäßen Kreiselpumpenaggregates,
- Fig. 2
- eine perspektivische Explosionsansicht des Kreiselpumpenaggregates gemäß
Fig. 1 , - Fig. 3
- eine Draufsicht auf das geöffnete Pumpengehäuse des Kreiselpumpenaggregates gemäß
Fig. 1 und2 mit einem Ventilelement in einer ersten Schaltstellung, - Fig. 4
- eine Ansicht gemäß
Fig. 3 mit dem Ventilelement in einer zweiten Schaltstellung, - Fig. 5
- eine Draufsicht auf die Stirnseite des Kreiselpumpenaggregates gemäß
Fig. 1 ,bis 4 - Fig. 6
- eine Schnittansicht des Kreiselpumpenaggregates gemäß
Fig. 5 entlang der Linie A-A inFig. 5 mit dem Ventilelement in einer anliegenden Position, - Fig. 7
- eine Schnittansicht gemäß
Fig. 6 mit dem Ventilelement in einer gelösten Position, - Fig. 8
- eine Seitenansicht des Kreiselpumpenaggregates gemäß
Fig. 1 bis 7 , - Fig. 9
- eine Schnittansicht des Kreiselpumpenaggregates gemäß
Fig. 8 mit einem Strömungssensor in einer ersten Position, - Fig. 10
- eine Schnittansicht gemäß
Fig. 9 mit einem Strömungssensor in einer zweiten Position, - Fig. 11
- eine perspektivische Ansicht des Ventilelementes 24 des Kreiselpumpenaggregates gemäß
Fig. 1 ,bis 10 - Fig. 12
- schematisch das Schaltbild einer Heizungsanlage mit einem Kreiselpumpenaggregat gemäß
Fig. 1 bis 11 , - Fig. 13
- eine perspektivische Explosionsansicht eines Kreiselpumpenaggregates gemäß einer zweiten Ausführungsform der Erfindung.
- Fig. 1
- a perspective view of a centrifugal pump assembly according to the invention,
- Fig. 2
- an exploded perspective view of the centrifugal pump assembly according to
Fig. 1 . - Fig. 3
- a plan view of the open pump housing of the centrifugal pump assembly according to
Fig. 1 and2 with a valve element in a first switching position, - Fig. 4
- a view according to
Fig. 3 with the valve element in a second switching position, - Fig. 5
- a plan view of the front side of the centrifugal pump assembly according to
Fig. 1 to 4 . - Fig. 6
- a sectional view of the centrifugal pump assembly according to
Fig. 5 along the line AA inFig. 5 with the valve element in an adjacent position, - Fig. 7
- a sectional view according to
Fig. 6 with the valve element in a released position, - Fig. 8
- a side view of the centrifugal pump assembly according to
Fig. 1 to 7 . - Fig. 9
- a sectional view of the centrifugal pump assembly according to
Fig. 8 with a flow sensor in a first position, - Fig. 10
- a sectional view according to
Fig. 9 with a flow sensor in a second position, - Fig. 11
- a perspective view of the
valve element 24 of the centrifugal pump assembly according toFig. 1 to 10 . - Fig. 12
- schematically the circuit diagram of a heating system with a centrifugal pump unit according to
Fig. 1 to 11 . - Fig. 13
- an exploded perspective view of a centrifugal pump assembly according to a second embodiment of the invention.
Das in den
Das Pumpengehäuse 2, in welchem das Laufrad 14 rotiert, weist zwei Sauganschlüsse 18 und 20 sowie einen Druckanschluss 22 auf. Im Inneren des Pumpengehäuses 2 ist ein drehbares Ventilelement 24 angeordnet, welches in diesem Ausführungsbeispiel trommelförmig ausgebildet ist. Das Ventilelement 24 dient dazu, wahlweise eine Strömungsverbindung von einem der Sauganschlüsse 18, 20 zum Saugmund 26 des Laufrades 14 herzustellen.The
Das Ventilelement 24 wird von einem topfförmigen Unterteil 28 und einem Deckel 30 gebildet. Beide sind fest miteinander verbunden. Der Deckel 30 weist zentral eine Öffnung mit einem ringförmigen Kragen auf, welcher einen Einlassstutzen 32 bildet, der in den Saugmund 26 des Laufrades 14 eingreift. Das Unterteil 28 ist an einer Lagerhülse 34 befestigt. Diese könnte auch einstückig mit dem Unterteil ausgebildet sein.The
Die Lagerhülse 34 stützt sich über eine als Druckfeder ausgebildete Feder 36 am Boden des Pumpengehäuses 2 ab. So drückt die Feder 36 das Ventilelement 24 in die in
Das Ventilelement 24 weist in seinem Unterteil 28 eine Schaltöffnung 48 auf, wie in
Das Ventilelement 24 weist an seiner Außenseite ein sich vom Boden 28 parallel zur Längsachse X weg erstreckendes Anschlagelement 56 in Form eines Vorsprungs bzw. einer Rippe auf. Dieses Anschlagelement 56 tritt in der in
Neben der Bewegung zwischen den zwei Schaltstellungen kann das Ventilelement 24, wie ausgeführt, eine Axialbewegung entlang der Längsachse X durchführen, wie in
Wie in den
In der Ausgangslage befindet sich das Ventilelement 24 in der in
Um aus dieser zweiten Schaltstellung das Ventilelement 24 wieder in die erste Schaltstellung zurückzubewegen, schaltet die Steuerelektronik 64 den Antriebsmotor für eine zweite längere Zeitspanne ab. Diese Zeitspanne ist so gewählt, dass sich nicht nur der Druck im Umgebungsbereich des Laufrades 14 verringert, sondern auch die Ringströmung soweit nachlässt, dass das durch das Gewicht 54 verursachte Drehmoment größer wird und das Ventilelement 24 wieder in die erste Schaltstellung zurückdrehen kann. Danach kann der Antriebsmotor dann wieder so in Betrieb genommen werden, dass durch den unmittelbaren Druckaufbau das Ventilelement 24 in dieser Schaltstellung gehalten wird. Auch für diesen Schaltvorgang kann die Steuereinrichtung eine reine Zeitsteuerung wählen. Alternativ ist es auch hier möglich, die Schaltstellung des Ventilelementes 24 tatsächlich zu erfassen.In order to move the
In diesem Ausführungsbeispiel weist die Steuerelektronik 64 einen nahe der Außenwandung des Klemmenkastens 16 gelegenen Magnetsensor 66 auf. Dieser kann ein Signal erzeugen, welches die Steuerelektronik 64 zum Umschalten der Schaltstellungen veranlasst. In diesem Ausführungsbeispiel ist nahe der Wandung, an welcher der Magnetsensor 66 liegt, an der Außenseite des Klemmenkastens 16 ein Rohrelement 68 angeordnet, in welchem zum Erfassen einer Strömung ein beweglicher Sensorkörper 70 angeordnet ist. Wenn durch das Rohrelement 68 keine Strömung verläuft, befindet sich der Sensorkörper 70, beispielsweise durch ein Federelement gehalten, in der in
Das beschriebene Kreiselpumpenaggregat wird beispielsweise in einem Heizungssystem eingesetzt, wie es in
Durch diese Anordnung kann auch eine Sicherheitsfunktion, welche ein Überhitzen des Primärwärmetauschers 80 verhindern kann, realisiert werden. Sollten in dem Heizkreis 74 beispielsweise alle Heizkörperventile geschlossen sein und keine Wärme mehr abgenommen werden, kann dies durch einen Temperatursensor erkannt werden. Wenn in diesem Zustand nun das Kreiselpumpenaggregat 82 kurz abgeschaltet wird, bewegt sich das Ventilelement 24 wieder in die zweite Schaltposition. In dieser kann dann ein Kreislauf über den Sekundärwärmetauscher 78 aufrechterhalten werden.By this arrangement, a safety function, which can prevent overheating of the
Bei dem vorangehend beschriebenen Ausführungsbeispiel erfolgt das Umschalten über das Ventilelement an der Saugseite des Laufrades 14. Alternativ kann jedoch in entsprechender Weise auch ein Umschalten an der Druckseite erfolgen. Ein solches Beispiel ist in
- 2,2'2,2 '
- Pumpengehäusepump housing
- 44
- Motorgehäusemotor housing
- 66
- Statorstator
- 88th
- Rotorrotor
- 1010
- Spaltrohrcanned
- 1212
- Rotorwellerotor shaft
- 1414
- LaufradWheel
- 1616
- Klemmenkastenterminal box
- 18, 20, 18'18, 20, 18 '
- Sauganschlüssesuction ports
- 22, 22'22, 22 '
- Druckanschlüssepressure connections
- 24, 24'24, 24 '
- Ventilelementvalve element
- 2626
- Saugmundsaugmund
- 2828
- Unterteillower part
- 3030
- Deckelcover
- 32'32 '
- Einlassstutzeninlet port
- 3434
- Lagerhülsebearing sleeve
- 3636
- Federfeather
- 4646
- Lagerbolzenbearing bolt
- 48, 48'48, 48 '
- Schaltöffnungswitching port
- 50, 5250, 52
- Eintrittsöffnungeninlet openings
- 5454
- GewichtWeight
- 5656
- Anschlagelementstop element
- 5858
- zweites Anschlagelementsecond stop element
- 6060
- Absatzparagraph
- 6464
- Steuerelektronikcontrol electronics
- 6666
- Magnetsensormagnetic sensor
- 6868
- Rohrelementtube element
- 7070
- Sensorkörpersensor body
- 7272
- Magnetmagnet
- 7474
- Heizkreisheating circuit
- 7676
- zweiter Heizkreissecond heating circuit
- 7878
- SekundärwärmetauscherSecondary heat exchanger
- 8080
- PrimärwärmetauscherPrimary heat exchanger
- 8282
- KreiselpumpenaggregatA centrifugal pump unit
- 8484
- Austrittsöffnungoutlet opening
- AA
- Drehrichtungdirection of rotation
- SS
- Strömungsrichtungflow direction
- XX
- Längsachselongitudinal axis
Claims (20)
gekennzeichnet durch
eine Steuereinrichtung (64), welche derart ausgebildet ist, dass sie zum Bewegen des Ventilelementes (24; 24') von einer Schaltstellung in eine andere Schaltstellung die Drehzahl des Antriebsmotors (6, 8) reduziert und dann, wenn der Druck in dem Pumpengehäuse (2) soweit abgesunken ist, dass das Ventilelement (24; 24') nicht mehr an der Anlagefläche (60) fixiert ist, und das Ventilelement (24; 24') in die andere Schaltstellung bewegt worden ist, die Drehzahl des Antriebsmotors (6, 8) wieder erhöht.Centrifugal pump assembly comprising an electric drive motor (6, 8), an impeller (14) driven therefrom, and a pump housing (2) surrounding the impeller (14), in which a movable valve element (24, 24 ') is arranged such that the valve element (24, 24 ') is movable between two switching positions by a flow generated by the impeller (14) and that at least a portion of the valve element (24, 24') is disengaged from a pressure generated by the impeller (14) in the pump housing Position is movable in an adjacent position in which it is fixed to a contact surface (60),
marked by
a control device (64) which is designed such that it reduces the speed of the drive motor (6, 8) for moving the valve element (24, 24 ') from one switching position to another switching position and then when the pressure in the pump housing ( 2) has fallen so far that the valve element (24, 24 ') is no longer fixed to the abutment surface (60), and the valve element (24, 24') has been moved into the other switching position, the rotational speed of the drive motor (6, 8) increased again.
und das Ventilelement (24; 24') in die andere Schaltstellung bewegt worden ist, den Antriebsmotor (6, 8) wieder einschaltet.Centrifugal pump assembly according to claim 1, characterized in that the control device (64) is designed such that it switches off the drive motor (6, 8) from one switching position to another switching position for moving the valve element (24, 24 ') and then when the Pressure in the pump housing (2) has dropped so far that the valve element (24, 24 ') is no longer fixed to the contact surface (60)
and the valve element (24; 24 ') has been moved into the other switching position, the drive motor (6, 8) turns on again.
mit folgenden Schritten:
with the following steps:
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18161525.3A EP3540234A1 (en) | 2018-03-13 | 2018-03-13 | Centrifugal pump assembly and method for moving a valve in a pump assembly |
US16/980,023 US11680571B2 (en) | 2018-03-13 | 2019-03-12 | Centrifugal pump unit and method for moving a valve element in a pump unit |
EP19710409.4A EP3765748B1 (en) | 2018-03-13 | 2019-03-12 | Centrifugal pump assembly and method for moving a valve in such a centrifugal pump assembly |
PCT/EP2019/056081 WO2019175135A1 (en) | 2018-03-13 | 2019-03-12 | Centrifugal pump assembly and method for moving a valve element in a centrifugal pump assembly of this type |
CN201980019023.8A CN111919030B (en) | 2018-03-13 | 2019-03-12 | Centrifugal pump assembly and method for moving a valve element in such a pump assembly |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18161525.3A EP3540234A1 (en) | 2018-03-13 | 2018-03-13 | Centrifugal pump assembly and method for moving a valve in a pump assembly |
Publications (1)
Publication Number | Publication Date |
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EP3540234A1 true EP3540234A1 (en) | 2019-09-18 |
Family
ID=61628235
Family Applications (2)
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EP18161525.3A Withdrawn EP3540234A1 (en) | 2018-03-13 | 2018-03-13 | Centrifugal pump assembly and method for moving a valve in a pump assembly |
EP19710409.4A Active EP3765748B1 (en) | 2018-03-13 | 2019-03-12 | Centrifugal pump assembly and method for moving a valve in such a centrifugal pump assembly |
Family Applications After (1)
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EP19710409.4A Active EP3765748B1 (en) | 2018-03-13 | 2019-03-12 | Centrifugal pump assembly and method for moving a valve in such a centrifugal pump assembly |
Country Status (4)
Country | Link |
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US (1) | US11680571B2 (en) |
EP (2) | EP3540234A1 (en) |
CN (1) | CN111919030B (en) |
WO (1) | WO2019175135A1 (en) |
Cited By (2)
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EP3904689A1 (en) * | 2020-04-28 | 2021-11-03 | Grundfos Holding A/S | Centrifugal pump assembly |
EP3904738A1 (en) * | 2020-04-28 | 2021-11-03 | Grundfos Holding A/S | Hydraulic valve device and centrifugal pump assembly including such hydraulic valve device |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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KR102525194B1 (en) * | 2021-02-09 | 2023-05-08 | 지엠비코리아 주식회사 | Integrated device for for water pump and valve |
US20230400037A1 (en) * | 2022-06-08 | 2023-12-14 | Cooper-Standard Automotive Inc | Multiport fluid pump with integrated valve |
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WO2015070955A1 (en) * | 2013-11-16 | 2015-05-21 | Brose Fahrzeugteile Gmbh & Co Kommanditgesellschaft, Würzburg | Electromotive coolant pump |
EP3376036A1 (en) | 2017-03-14 | 2018-09-19 | Grundfos Holding A/S | Pump unit |
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2018
- 2018-03-13 EP EP18161525.3A patent/EP3540234A1/en not_active Withdrawn
-
2019
- 2019-03-12 EP EP19710409.4A patent/EP3765748B1/en active Active
- 2019-03-12 WO PCT/EP2019/056081 patent/WO2019175135A1/en unknown
- 2019-03-12 US US16/980,023 patent/US11680571B2/en active Active
- 2019-03-12 CN CN201980019023.8A patent/CN111919030B/en active Active
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DE9013992U1 (en) * | 1990-10-08 | 1991-10-24 | Grundfos International A/S, Bjerringbro | Motor pump unit for circulation systems with two parallel circuits |
US5924432A (en) * | 1995-10-17 | 1999-07-20 | Whirlpool Corporation | Dishwasher having a wash liquid recirculation system |
US20040173249A1 (en) * | 2001-07-07 | 2004-09-09 | Walter Assmann | Dishwasher comprising spraying arms and a circulating pump |
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EP3904689A1 (en) * | 2020-04-28 | 2021-11-03 | Grundfos Holding A/S | Centrifugal pump assembly |
EP3904738A1 (en) * | 2020-04-28 | 2021-11-03 | Grundfos Holding A/S | Hydraulic valve device and centrifugal pump assembly including such hydraulic valve device |
WO2021219540A1 (en) * | 2020-04-28 | 2021-11-04 | Grundfos Holding A/S | Centrifugal pump assembly |
WO2021219539A1 (en) * | 2020-04-28 | 2021-11-04 | Grundfos Holding A/S | Hydraulic valve device and centrifugal pump assembly including such hydraulic valve device |
Also Published As
Publication number | Publication date |
---|---|
EP3765748B1 (en) | 2024-07-03 |
US11680571B2 (en) | 2023-06-20 |
WO2019175135A1 (en) | 2019-09-19 |
US20210010477A1 (en) | 2021-01-14 |
CN111919030B (en) | 2022-12-02 |
EP3765748A1 (en) | 2021-01-20 |
CN111919030A (en) | 2020-11-10 |
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