EP2867400B1 - Wäsche- oder geschirrbehandlungsmaschine - Google Patents

Wäsche- oder geschirrbehandlungsmaschine Download PDF

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Publication number
EP2867400B1
EP2867400B1 EP13731074.4A EP13731074A EP2867400B1 EP 2867400 B1 EP2867400 B1 EP 2867400B1 EP 13731074 A EP13731074 A EP 13731074A EP 2867400 B1 EP2867400 B1 EP 2867400B1
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EP
European Patent Office
Prior art keywords
compressor
circuit
thermo protector
control unit
switching device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP13731074.4A
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English (en)
French (fr)
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EP2867400A1 (de
Inventor
Roberto Ragogna
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Electrolux Home Products Corp NV
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Electrolux Home Products Corp NV
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Priority to EP13731074.4A priority Critical patent/EP2867400B1/de
Publication of EP2867400A1 publication Critical patent/EP2867400A1/de
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/206—Heat pump arrangements
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2101/00—User input for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/44—Current or voltage
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/50—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to heat pumps, e.g. pressure or flow rate
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/26—Heat pumps
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/08—Control circuits or arrangements thereof
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/32—Control of operations performed in domestic laundry dryers 
    • D06F58/34—Control of operations performed in domestic laundry dryers  characterised by the purpose or target of the control
    • D06F58/50—Responding to irregular working conditions, e.g. malfunctioning of blowers

Definitions

  • the present disclosure relates to laundry or tableware treating machines, e.g. laundry drying and/or washing machines or dish-washer, more particularly to a method and system for operating a treating machine.
  • laundry or tableware treating machines e.g. laundry drying and/or washing machines or dish-washer
  • a drying appliance e.g. a tumble dryer, cabinet dryer
  • a drying chamber for the articles to be dried, i.e. clothes, which chamber (in case of tumble dryer) is rotatably supported within a cabinet and made to rotate by means of a driving device, typically including an electric motor connected to the drying chamber e.g. via a belt.
  • a driving device typically including an electric motor connected to the drying chamber e.g. via a belt.
  • laundry treating machines of known type generally comprise a cabinet assembly 1 including a base element 2, a front panel 3, a rear panel 4, two side panels 5 and a top panel 6.
  • Front panel 3 has an opening, closed by a shutter 15, used to introduce in the machine the laundry to be treated.
  • Alternative solutions include the possibility of an opening on the top side.
  • the cabinet assembly 1 typically supports also operational component parts of the machine which are required for drying laundry, such as a rotating drum 16, a control panel 17, air circulating conduits, heating devices (e.g. a heat pump with a compressor), filters, liquid draining apparatus and so on.
  • the laundry being dried is inserted into and removed from the drum through an opening closed e.g. by a shutter 15 and the drum is normally adapted for rotating around an horizontal axis by means of a motor.
  • a flow rate of hot air passes through the drum, removing water from wet clothes. Inside the drum, the hot air is cooled down and the heat released by the air allows the evaporation of the water from the clothes.
  • heat pump dryer the drying air is heated up via the condenser before entering the drum and the drying air exiting the drum is cooled down via the evaporator.
  • the laundry treating machine can be equipped with a passive switch which interrupts the power supply to the heat pump compressor when predetermined thresholds of heat or voltage load or current are exceeded.
  • the passive switch opens when a threshold temperature of the heat pump compressor is reached or when a power load or current through the passive switch is reached, for example due to voltage peaks from the mains.
  • thermo protector When normal functioning conditions are re-established the passive switch (e.g. a thermo protector) is adapted to go back to operative status closing the circuit, however there is a considerable delay before this happens. It is to be noted, in fact, that compressor thermo protector has a big inertia for turning back to the closed position, typically about 30 minutes.
  • Thermo protector opening is not an event that should happen in the cycle in normal conditions, therefore it would be very useful to recognize when this occurs so as to discover possible problems of current settings and possibly to apply corrective actions to mitigate the issue and preventing the passive switch from opening again in the same drying cycle or in subsequent cycles
  • Prior art laundry treating machines are not able to detect the opening of such compressor passive switch, and this can cause problems to the correct functioning of the machine.
  • WO2009098158 discloses a tumble drier comprising a drying chamber for the articles to be dried, a process air channel, in which a heating system for heating the process air is provided and the heated process air can be conducted over the articles to be dried in the drying chamber by means of a fan, and comprising a heat pump with a heat sink, a heat source and a heat transport unit, in addition to a controller.
  • the heating system is a two-stage system comprising a first heating stage in a first circuit and a second heating stage in a second circuit parallel to the first.
  • a thermoswitch is situated in the first circuit or in the second circuit, said switch being thermally coupled to the heat pump.
  • thermo protector activation It is not known in the prior art a method and system for detecting such thermo protector activation.
  • a laundry and/or tableware treating machine including: a treating chamber where the items can be introduced to be treated with a treating medium, a control unit UC1, a heat pump system including a compressor C, a first heat exchanger for heating a refrigerant, a second heat exchanger for cooling the refrigerant and heating the treating medium and expansion means; at least an active switching device RL, controllable by the control unit UC1, for selectively switching ON/OFF the compressor C; wherein it further comprises: at least a passive switching device not controllable by control unit UC1, and including a thermo protector circuit P adapted to cut the power supply to the compressor C when predetermined temperature or voltage load or current thresholds are exceeded, monitoring means to detect the opening of the thermo protector circuit P to cut the power supply to the compressor C, wherein the monitoring means includes at least one of the following: a system for monitoring the temperature of the refrigerant; a sensing circuit to detect a change of potential and/or current at an assembly comprising the compressor
  • the system for monitoring the temperature of the refrigerant comprises the control unit UC1 and at least a sensor adapted to measure the temperature of the refrigerant at a predetermined position of the heat pump system and convey the information to the control unit UC1.
  • control unit UC1 is able to recognize the opening of the thermo protector circuit P when the temperature of the refrigerant reaches or decrease below a predetermined value and the active switching device RL is in switching ON position for the compressor C.
  • the system for monitoring the temperature of the refrigerant is adapted to maintain in a storage area a reference parameter for an expected temperature measured in a predetermined position of the heat pump system, monitor temperature values detected by the sensor, responsive to an anomaly of the monitored values with respect to the at least one reference parameter, determining the activation of the thermo protector circuit P.
  • the reference parameter includes a predetermined threshold in the variation in the gradient of a curve representing the values of monitored temperature over time, and wherein the step of determining an anomaly includes the steps of:
  • the step of determining the existence of an anomaly includes filtering the curve with a low-pass numeric filter.
  • the temperature is measured at the outlet second heat exchanger and/or at the inlet expansion means.
  • the sensing circuit comprises at least an electrical detecting circuit ECS1, ECS2, ECSH1, ECSH2 connected to at least one of the following:
  • the compressor C is connected in series with the thermo protector circuit P, the assembly formed by the compressor C and the thermo protector circuit P being connected to a power main, and wherein the sensing circuit comprises:
  • thermo protector circuit P is electrically connected to the active switching device RL, the control unit UC1 detecting the output of the detecting circuit ECS2 when the active switching device RL is open and closed.
  • the compressor C is electrically connected to the active switching device RL, the control unit UC1 detecting the output of the detecting circuit ECS2 when the active switching device RL is open and closed.
  • control unit UC1 is also connected to a connection point located between the compressor C and the active switching device RL or located between the thermo protector circuit P and the active switching device RL, through a second detecting circuit ECS1.
  • the compressor C is connected in series with the thermo protector circuit P, the assembly formed by the compressor C and the thermo protector circuit P being connected to a power main, and wherein the sensing circuit comprises:
  • the shunt device SH1 SH2 is placed between at least one of the following:
  • thermo protector circuit allows to detect the activation of the thermo protector circuit and gives the possibility of arranging some corrective actions to decrease the likelihood of future occurrence of such activation.
  • the present invention offers a number of benefits.
  • One of the advantages of the method according to a preferred embodiment of the present invention is that of increasing efficiency of the drying (or washing/drying) machine by limiting the occurrence of machine interruption caused by an excessive temperature reached by the compressor or an excessive load. If the activation of the thermo protector circuit is promptly detected, the microcontroller can put in place corrective actions aimed at increasing the future efficiency and the reliability of the machine (e.g. a heat pump tumble dryer).
  • the system and method according to a preferred embodiment of the present invention aims at detecting the activation of a thermo protector circuit during the normal cycle of laundry treatment (e.g. drying) in a laundry treating machine (e.g. a tumble dryer or washing/drying machine).
  • a laundry treating machine e.g. a tumble dryer or washing/drying machine.
  • a heat pump laundry dryer machine e.g. a heat pump tumble dryer
  • the same solutions here described can be applied to other kind of laundry treating machines, e.g. washing machines or washing/drying machine.
  • a laundry treating machine includes a treating chamber where the laundry items can be introduced to be treated with a treating medium; a circuit where the treating means circulate (the treating means can be e.g. air in case of tumble dryer or water in case of washing machine); a heat pump system including a compressor C, a first heat exchanger for heating a refrigerant, a second heat exchanger for cooling the refrigerant and heating the treating medium; at least an active switching device for selectively activating/deactivating the compressor; at least a passive switching device including a thermo protector circuit P adapted to cut the power supply to the compressor C when predetermined temperature or load thresholds are exceeded.
  • the treating means can be e.g. air in case of tumble dryer or water in case of washing machine
  • a heat pump system including a compressor C, a first heat exchanger for heating a refrigerant, a second heat exchanger for cooling the refrigerant and heating the treating medium; at least an active switching device for selectively activating/deactivating the compressor; at least a passive
  • FIG. 2 schematically shows a possible laundry treating machine implementing the present invention, more particularly a heat pump tumble dryer:
  • the machine apparatus includes a drying chamber 201, preferably a drum rotatably mounted in an outer cabinet and accommodating the devices of the machine.
  • the clothes or items to be dried are introduced into the drying chamber, through an aperture of the cabinet, in particular into a rotatable drum, possibly enclosed within a water bearing chamber (normally in case of washing/drying apparatus, while for simple dryer a water bearing chamber is normally not needed).
  • the drum is set into rotation by means of a driving system for instance an electric motor 203 e.g. connected to the drum via a belt.
  • An air inlet path is connected to a side of the drying chamber and an air outlet path is connected to the other side of the drying chamber.
  • the air inlet path, the air outlet path and the drying chamber define a drying air circuit 205.
  • a fan 207 is normally provided for moving drying air along the circuit.
  • a dedicated motor 209 can be coupled to the fan 207, but in a possible simpler implementation the same motor can operate the fan 207 and the drum 201 (in other words only one of the two motor 203 and 207 can be present).
  • the drying system includes a heat pump system comprising a compressor C, a first heat exchanger 211 (also called evaporator), acting as a cold sink (i.e. evaporator or gas heater in case refrigerant operates at least at critical pressure), a second heat exchanger 213, acting as a hot sink (i.e.
  • a throttle 215 is normally provided between the first heat exchanger 211 and the second heat exchanger 213.
  • Alternative solutions to the throttle include expansion means, capillary tube or controlled expansion valve.
  • the drying air circuit forms a substantially closed loop and the second heat exchanger 213 is arranged downstream the first heat exchanger 211.
  • a cooling fan 217 is provided to cool down the compressor.
  • the heat pump system may further comprises an auxiliary heat exchanger 219, preferably arranged downstream the second heat exchanger 213 and acting as an auxiliary condenser for removing heat from the heat pump system.
  • An auxiliary cooling fan 221 is provided to move an air stream through the auxiliary heat exchanger 219.
  • a single cooling fan can be used to both cool down the compressor C and to flow air towards the auxiliary condenser 219.
  • a control unit UC1 operates the compressor cooling fan 217 and the fan 221 for cooling the auxiliary condenser 219 according to predetermined temperature of the refrigerant.
  • the laundry treating machine implementing the method and system according to a preferred embodiment of the present disclosure is preferably controlled by a control unit UC1 which receives information by the system for monitoring the temperature of the refrigerant and/or by the sensing circuit to detect a change of potential and or current at the assembly including the compressor C and the thermo protector circuit P.
  • the control unit UC1 which can take one or more of a possible set of corrective actions. Also, with the ability to detect the opening of the passive switching device this, it is possible to log this event inside a control unit UC1, to help service people to correctly diagnose possible machine malfunction causes.
  • thermo protector opening is not an event that should happen in the cycle in normal conditions. So if this kind of event is detected, assumptions on the malfunctioning of the machine can be made; this can be due to different causes like non optimal installation, ambient temperature, clogged filters etc.
  • An additional advantage related to the ability to detect thermo protector opening is the chance to apply cycle parameters modification in order to reduce the probability of another cut-off event in the same cycle in which the event takes place and most of all to reduce the probability of occurrence of a cut-off event in the future/subsequent cycles, so as to not affect the normal cycle duration and consumption.
  • thermo protector circuit two different ways of detecting the activation of the thermo protector circuit can be implemented: the first one includes monitoring the temperature of the refrigerant by means of temperature sensors; the second one includes monitoring the electric assembly comprising the compressor and the thermo protector circuit by means of dedicated sensing circuits.
  • the information of the detected activation is provided to the control unit UC1 which can then evaluate and perform a corrective action, e.g. a cycle parameters modification which can be implemented irrespective of the way the thermo protector opening is detected.
  • a possible corrective action is to modify the compressor cooling fan 217 behaviour:
  • refrigerant temperature exceeds a configured maximum value
  • the compressor is switched-off for a while, until right conditions to restart are satisfied.
  • the advantage is that in this case the compressor remains off for a shorter time ( ⁇ 3 to 5 min) than in the case of thermo protector opening ( ⁇ 30 min), allowing the cycle duration not be to particularly affected and maintaining safety conditions for the compressor at the same time.
  • Such configured maximum value can be adjusted down, e.g. from 70 to 65 degrees, with the refrigerant temperature detected at the outlet of the second heat exchanger, for example.
  • a further action can be adjusting the rotational speed of the electric motor of the compressor so as to reduce the compressor output at an average lower operating value, thereby reducing the temperature of the compressor.
  • drum/process fan motor parameters can be applied to try to ensure better cycle conditions:
  • a temperature sensor is used to measure the variations of the refrigerant temperature.
  • an NTC thermistor is placed in such a way to measure the refrigerant temperature at condenser outlet and/or at expansion means inlet, additionally or alternatively the temperature sensor can be arranged at different location of the heat pump system for example at the outlet of compressor C. Evaluating the behaviour of this signal, it is possible to understand if the compressor thermo protector has temporarily disconnected the compressor from the line after a current absorption peak or temperature too high or line micro-interruptions. In fact, when thermo protector opens the circuit that supplies the compressor, after a short time, temperature start to decrease.
  • thermo protector cut-off For example if the refrigerant temperature at the condenser outlet decreases particularly below a predetermined value, it turns out that the thermo protector is open. It is to be stressed that the active switching device RL is obviously still in closed position, so according to the control unit UC1, the compressor should be running, therefore it is evident the need for the control unit UC1 to recognize and improper deactivation of the compressor due to the opening of the thermo protector.
  • the control unit UC1 monitors the status of the active switching device RL by means of an electrical detecting circuit so as to detect when the active switching device RL is in open or closed position.
  • the temperature slope is calculated to determine the occurrence of the thermo-protector activation.
  • Condenser temperature during cycle has various oscillation due for example to compressor cooling fan activation or temporary decrease of air flow due to drum motor (connected to process fan) reversing. If the slope falls negative without any apparent reason, we could suppose that the cause is thermo protector cut-off.
  • Filt_Slope Filt_slope t ⁇ 1 * 1 ⁇ ⁇ + Slope t * ⁇ With ⁇ ⁇ 1.
  • the curve A represent the Condenser temperature over time
  • curve B is the slope of the temperature curve A, filtered with a low pass filter
  • Line C represents the two possible states of the Compressor (ON or CUT OFF) following thermo protector circuit activation.
  • a small Slope Decrease SD can be simply due to normal machine behavior (e.g. caused by a motor reversing), while a consistent Slope Fall SF (e.g. exceeding a predetermined threshold) is a reasonable indication that a cut-off occurred because of a thermo protector circuit activation.
  • the method in a preferred embodiment of the present invention is based on the assumption that a slope exceeding a predetermined threshold is considered a detection of the activation of thermo protector circuit. Those skilled in the art will appreciate that such threshold can be adjusted and tuned according to machine characteristics and/or historic data.
  • thermo protector opening it's possible also to detect the restoring of working conditions: again the control unit can be programmed to perform certain actions reacting to the modified conditions.
  • curves A, B and C of Figure 3 are now represented in Figure 6 showing the case when the thermo protector circuit is de-activated causing a Slope Run over a predetermined threshold.
  • FIG. 7 schematically shows a diagram representing the method steps of the first embodiment of the present disclosure.
  • the process is a method for detecting the activation of a thermo protector circuit, e.g. during a drying cycle in a drying or washing or washing/drying machine, more generally laundry treating machine.
  • the process starts at circle 501 and it is transferred to box 503 where an expected temperature over time is estimated. This step could be skipped in case the machine has one or more predetermined sets of values stored in an internal memory.
  • the process is then passed to step 505 where the temperature of a condenser of the laundry treating machine is monitored: in the present example we consider a heat pump type tumble dryer, but the same method could be implemented on other kinds of laundry treating machines.
  • step 509 a corrective action is started (step 511).
  • the way of determining an anomaly can be implemented in several different ways, from a simple threshold comparison to a more sophisticated analysis of the detected temperature curve with expected values as described above.
  • the corrective actions can be implemented in several different manners as explained above and as immediately appreciated by those skilled in the art. It should also be understood that the temperature monitoring could be done even in an indirect way, e.g. by monitoring the pressure within the refrigerant circuit.
  • step 505 The process then goes back to step 505 and starts over again, until the end (507) of the treating cycle is reached.
  • This determination of end of cycle can be done in several different ways, e.g. when a predetermined drying time has expired, but it can be more sophisticated, taking into consideration e.g. the temperature or a dryness parameter of the laundry.
  • thermo protector circuit P is open or closed directly interpreting the information received by the circuit itself.
  • sensing circuit is represented in Figure 8 where compressor C is connected in series with a thermo protector circuit P, and the assembly formed by the compressor C and the thermo protector circuit P is connected to the line wire L and to the neutral wire N of a power main.
  • An active switching device RL typically a relay or a solid state device, such as a triac, etc.
  • the active switching device will be always referred to as "relay” in the following, but it is understood that it could be a different switching device
  • the system for detecting the thermo protector circuit P status includes a first electrical detecting circuit ECS 1, a second electrical detecting circuit ECS2 and the control unit UC1. Connections and operation of these components is described in detail in the following, whereas structure and operation of the control unit UC1 will not be explained in detail, since it will appear obvious to those skilled in the art.
  • Compressor C is electrically connected to the line wire L and the thermo protector circuit P is electrically connected to the relay RL, at the terminal opposite to the one connected to the neutral wire N.
  • the compressor C is connected to the neutral wire N of the power main, when the relay is in activating condition.
  • the first electrical detecting circuit ECS1 is connected, through a sensing wire S 1, to the neutral wire N, on one hand, immediately downstream of the relay RL.
  • the first electrical detecting circuit ECS1 is connected to control unit UC1.
  • a second electrical detecting circuit ECS2 is connected to the connection point between the thermo protector circuit P and the compressor C, on one hand, through a sensing wire S2.
  • the second electrical detecting circuit ECS2 is connected to control unit UC1.
  • the control unit UC1 is also connected to the relay RL, to control its condition.
  • the control unit UC1 by evaluating the output of the first electrical detecting circuit ECS 1 when the relay RL is in deactivating condition, is able to evaluate the status of the thermo protector circuit P, to establish if it is open or closed. In fact if the thermo protector circuit P is closed, first electrical detecting circuit ECS1 detects substantially the line potential, whereas if the thermo protector circuit P is open, first electrical detecting circuit ECS1 detects substantially the neutral potential.
  • the sensing wire S1 is directly connected to neutral wire N and its output is directly dependant on the neutral-line circuit, independently from the thermo protector circuit P status.
  • the control unit UC1 by evaluating the output of the second electrical detecting circuit ECS2 is able to evaluate the status of the thermo protector circuit P. In fact if the thermo protector circuit P is closed, the second electrical detecting circuit ECS2 detects substantially the neutral potential, whereas if the thermo protector circuit P is open, the second electrical detecting circuit ECS2 detects substantially the line potential.
  • thermo protector circuit P is electrically connected to the line wire L and the compressor C is electrically connected to the relay RL
  • the control unit UC1 by evaluating the output of the first electrical detecting circuit ECS1 and the second electrical detecting circuit ECS2 when the relay RL is in deactivating condition, is able to evaluate the status of the thermo protector circuit P, and to establish if it is open or closed.
  • first electrical detecting circuit ECS1 detects substantially a potential pulled up to line potential
  • thermo protector circuit P is open, first electrical detecting circuit ECS1 detects substantially a floating junction connected neither to line not to neutral.
  • thermo protector circuit P if the thermo protector circuit P is closed, the second electrical detecting circuit ECS2 detects substantially the line potential, whereas if the thermo protector circuit P is open, the second electrical detecting circuit ECS2 detects substantially the neutral potential. In this configuration a double check about the status of the thermo protector circuit P is provided for improving reliability of the sensing circuit.
  • the sensing wire S1 is directly connected to neutral wire N and its output is dependant on the neutral-line, independently from the thermo protector circuit P status, through the neutral-line circuit.
  • the control unit UC1 by evaluating the output of the second electrical detecting circuit ECS2 is able to evaluate the status of the thermo protector circuit P, and to establish if it is open or closed. In fact if the thermo protector circuit P is closed, the second electrical detecting circuit ECS2 detects substantially the line potential, whereas if the thermo protector circuit P is open, the second electrical detecting circuit ECS2 detects substantially the neutral potential.
  • thermo protector circuit P A simpler implementation of the second embodiment of the present invention is possible, taking into consideration that the activation (i.e. opening) of thermo protector circuit P is likely to happen only when the active switching device RL is closed, i.e. when the compressor is connected and activated.
  • a simpler version of the above mentioned circuit includes only one electrical detecting circuit ECS2, which is connected to a connection point between the thermo protector circuit P and the compressor C through a sensing wire S2.
  • the control unit UC1 by evaluating the output of the second electrical detecting circuit ECS2 is able to evaluate the status of the thermo protector P only when the active switching device RL is closed, with the compressor C connected to the line wire L and the thermo protector P connected to the neutral wire N.
  • the second electrical detecting circuit ECS2 detects substantially the neutral potential
  • the thermo protector circuit P is open, the second electrical detecting circuit ECS2 detects substantially the line potential.
  • the second electrical detecting circuit ECS2 detects always the line potential irrespective of the status of the thermo protector circuit P.
  • the control unit UC1 is able to evaluate the status of the thermo protector P even if the active switching device RL is open.
  • the sensing circuit according to the implementation shown in Figures 11 by evaluating the output of the second electrical detecting circuit ECS2 is able to evaluate the status of the thermo protector P when the active switching device RL is closed. In fact if the thermo protector circuit P is closed, the second electrical detecting circuit ECS2 detects substantially the line potential, whereas if the thermo protector circuit P is open, the second electrical detecting circuit ECS2 detects substantially the neutral potential.
  • the sensing circuit according to the implementation shown in Figures 11 by evaluating the output of the second electrical detecting circuit ECS2 is able to evaluate the status of the thermo protector circuit P also when the active switching device RL is open. In fact if the thermo protector circuit P is closed, the second electrical detecting circuit ECS2 detects substantially the line potential, whereas if the thermo protector circuit P is open, the second electrical detecting circuit ECS2 detects substantially a floating junction connected neither to line not to neutral.
  • thermo protector circuit P is open or closed by measuring the current flowing through the assembly formed by the compressor and thermo protector circuit P.
  • the sensing wire S2 connected to a connection point between the thermo protector circuit P and the compressor C can be avoided. This allows manufacturing cost saving and less complexity, because there is no need to have an additional wire form the electronic board to the compressor/thermo protector system.
  • the compressor C is connected in series with the thermo protector circuit P and to the power main.
  • the system for detecting the thermo protector circuit P status includes the control unit UC1, connected to the relay RL for activating/deactivating the compressor C.
  • An electrical detecting circuit ECS1 is connected, on one side, to the neutral wire N, through a sensing wire S1, between the relay RL and the thermo protector circuit P, and, on the other side, to the control unit UC1, similarly to previously described implementation.
  • a shunt evaluation electrical circuit ECSH1 is connected to a shunt device SH1 placed in series with the thermo protector circuit P and the compressor C. The shunt device SH1 is placed next to the compressor, along the line wire L.
  • the shunt evaluation electrical circuit ECSH1 is connected to the control unit UC1. With this configuration, the control unit UC1 evaluates the output of the electrical detecting circuit ECS1, when the relay RL is closed.
  • the status of the relay RL is monitored by the control unit UC1 by means of the first electrical detecting circuit ECS1
  • the control unit UC1 verifies if a current is flowing in the shunt device SH1, by the shunt evaluation electrical circuit ECSH1, and establishes if the thermo protector circuit P is closed or open.
  • a different configuration of the apparatus is shown in figure 13 , where the shunt device SH2 is placed between the thermo protector circuit P and the active switching device RL.

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  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)

Claims (15)

  1. Wäsche- oder Geschirrbehandlungsmaschine, die Folgendes aufweist:
    - eine Behandlungskammer (16), in die die Gegenstände gegeben werden können, um mit einem Behandlungsmittel behandelt zu werden;
    - eine Steuereinheit (UC1)
    - ein Heizpumpensystem, das einen Kompressor (C), einen ersten Wärmetauscher (211) zum Erwärmen eines Kühlmittels, einen zweiten Wärmetauscher (213) zum Kühlen des Kühlmittels und zum Erwärmen des Behandlungsmittels, und ein Ausdehnungsmittel aufweist;
    - mindestens eine aktive Schaltvorrichtung (RL), die von der Steuereinheit (UC1) gesteuert werden kann, um den Kompressor (C) selektiv ein- oder auszuschalten;
    dadurch gekennzeichnet, dass sie ferner Folgendes umfasst:
    - mindestens eine passive Schaltvorrichtung, die nicht von der Steuereinheit (UC1) gesteuert werden kann und eine thermische Schutzschaltung (P) aufweist, die dazu ausgelegt ist, die Stromversorgung zu dem Kompressor (C) zu unterbrechen, wenn vorgegebene Temperatur- oder Spannungslast- oder Elektrizitätsschwellenwerte überschritten werden;
    - Überwachungsmittel zum Erfassen des Öffnens der thermischen Schutzschaltung (P), um die Stromversorgung zu dem Kompressor (C) zu unterbrechen, wobei die Überwachungsmittel mindestens eines der Folgenden umfassen: ein System zum Überwachen der Temperatur des Kühlmittels; eine Abtastschaltung zum Erfassen einer Veränderung des Potenzials und/oder der Elektrizität an einer Anordnung, die den Kompressor (C) und die thermische Schutzschaltung (P) umfasst.
  2. Behandlungsmaschine nach Anspruch 1, wobei das System zum Überwachen der Temperatur des Kühlmittels die Steuereinheit (UC1) und mindestens einen Sensor umfasst, der dazu ausgelegt ist, die Temperatur des Kühlmittels an einer vorgegebenen Position des Heizpumpensystems zu messen und die Informationen an die Steuereinheit (UC1) weiterzuleiten.
  3. Behandlungsmaschine nach Anspruch 1 oder 2, wobei die Steuereinheit (UC1) in der Lage ist, das Öffnen der thermischen Schutzschaltung (P) zu erkennen, wenn die Temperatur des Kühlmittels einen vorgegebenen Wert erreicht oder darunter fällt und die aktive Schaltvorrichtung (RL) in der eingeschalteten Position für den Kompressor (C) ist.
  4. Behandlungsmaschine nach Anspruch 2 oder 3, wobei das System zum Überwachen der Temperatur des Kühlmittels dazu ausgelegt ist
    - in einem Aufbewahrungsbereich einen Referenzparameter für eine erwartete Temperatur beizubehalten, die an einer vorgegebenen Position des Heizpumpensystems gemessen wird;
    - die von dem Sensor erfassten Temperaturwerte zu überwachen;
    - als Reaktion auf eine Anomalie bei den überwachten Werten in Bezug auf den mindestens einen Referenzparameter die Aktivierung der thermischen Schutzschaltung (P) zu bestimmen.
  5. Behandlungsmaschine nach Anspruch 4, wobei der Referenzparameter einen vorgegebenen Schwellenwert in der Schwankung des Gradienten einer Kurve, die die Werte der überwachten Temperatur gegenüber der Zeit darstellt, beinhaltet und wobei der Schritt des Bestimmens einer Anomalie die folgenden Schritte beinhaltet:
    - Auftragen einer Kurve mit den erfassten Werten der Temperatur gegenüber der Zeit
    - Messen des Gradienten der Kurve in regelmäßigen Zeitabständen;
    - Vergleichen von aufeinanderfolgend gemessenen Gradienten, um zu bestimmen, ob die Differenz den vorgegebenen Schwellenwert übersteigt.
  6. Behandlungsmaschine nach Anspruch 5, wobei der Schritt des Bestimmens des Vorliegens einer Anomalie das Filtern der Kurve mit einem numerischen Tiefpassfilter beinhaltet.
  7. Behandlungsmaschine nach einem der Ansprüche 1 bis 6, wobei die Temperatur am Auslass des zweiten Wärmetauschers und/oder am Einlass des Ausdehnungsmittels gemessen wird.
  8. Behandlungsmaschine nach Anspruch 1, wobei die Abtastschaltung mindestens eine elektrische Detektionsschaltung (ECS1, ECS2, ECSH1, ECSH2) umfasst, die mit mindestens einem der Folgenden verbunden ist:
    - einem Verbindungspunkt, der sich zwischen der thermischen Schutzschaltung (P) und dem Kompressor (C) befindet;
    - einem Verbindungspunkt, der sich zwischen der thermischen Schutzschaltung (P) und der Leitung oder dem Nullleiter des Starkstromnetzes, an das der Kompressor (C) angeschlossen ist, befindet;
    - einem Verbindungspunkt, der sich zwischen dem Kompressor (C) und der Leitung oder dem Nullleiter des Starkstromnetzes, an das der Kompressor (C) angeschlossen ist, befindet.
  9. Behandlungsmaschine nach Anspruch 1 oder 8, wobei der Kompressor (C) mit der thermischen Schutzschaltung (P) in Reihe geschaltet ist und die von dem Kompressor (C) und der thermischen Schutzschaltung (P) gebildete Anordnung an ein Starkstromnetz angeschlossen ist, und wobei die Abtastschaltung Folgendes umfasst:
    - die Steuereinheit (UC1), die mindestens mit der aktiven Schaltvorrichtung (RL) verbunden ist;
    - mindestens eine erste elektrische Detektionsschaltung (ECS2), die einerseits mit einem Verbindungspunkt zwischen der thermischen Schutzschaltung (P) und dem Kompressor (C) verbunden ist und andererseits mit der Steuereinheit (UC1) verbunden ist;
    - wobei die Steuereinheit (UC1) die Ausgabe der mindestens ersten elektrischen Detektionsschaltung (ECS2) in Übereinstimmung mit der aktiven Schaltvorrichtung (RL) auswertet, die sich in einem deaktivierenden oder aktivierenden Zustand befindet, um den Status der thermischen Schutzschaltung (P) auszuwerten.
  10. Behandlungsmaschine nach einem der Ansprüche 8, 9, wobei die thermische Schutzschaltung (P) mit der aktiven Schaltvorrichtung (RL) elektrisch verbunden ist, wobei die Steuereinheit (UC1) die Ausgabe der Detektionsschaltung (ECS2) erfasst, wenn die aktive Schaltvorrichtung (RL) offen und geschlossen ist.
  11. Behandlungsmaschine nach einem der Ansprüche 8, 9, wobei der Kompressor (C) mit der aktiven Schaltvorrichtung (RL) elektrisch verbunden ist, wobei die Steuereinheit (UC1) die Ausgabe der Detektionsschaltung (ECS2) erfasst, wenn die aktive Schaltvorrichtung (RL) offen und geschlossen ist.
  12. Behandlungsmaschine nach Anspruch 1, wobei der Kompressor (C) mit der thermischen Schutzschaltung (P) in Reihe geschaltet ist und die von dem Kompressor (C) und der thermischen Schutzschaltung (P) gebildete Anordnung an ein Starkstromnetz angeschlossen ist, und wobei die Abtastschaltung Folgendes umfasst:
    - die Steuereinheit (UC1), die mit der aktiven Schaltvorrichtung (RL) verbunden ist;
    - eine elektrische Nebenanschlussauswertungsschaltung (ECSH1, ECSH2), die mit einer Nebenanschlussvorrichtung (SH1, SH2) verbunden ist und in Reihe mit der vom Kompressor (C) und der thermischen Schutzschaltung (P) gebildeten Anordnung angeordnet ist, um den Stromfluss in die Nebenanschlussvorrichtung (SH1, SH2) zu überwachen
    - wobei die Steuereinheit (UC1) die Ausgabe der elektrischen Nebenanschlussauswertungsschaltung (ECSH1, ECSH2) in Übereinstimmung mit der aktiven Schaltvorrichtung (RL) auswertet, die sich im eingeschalteten Zustand für den Kompressor (C) befindet, um den Status der thermischen Schutzschaltung (P) auszuwerten.
  13. Behandlungsmaschine nach Anspruch 12, wobei die Nebenanschlussvorrichtung (SH1, SH2) zwischen mindestens einem der Folgenden angeordnet ist:
    - Kompressor (C) und Leitung oder Nullleiter des Starkstromnetzes;
    - thermischer Schutzschaltung (P) und aktiver Schaltvorrichtung (RL);
    - Kompressor (C) und aktiver Schaltvorrichtung (RL) ;
    - thermischer Schaltvorrichtung (P) und Leitung oder Nullleiter des Starkstromnetzes;
    - Kompressor (C) und thermischer Schutzschaltung (P).
  14. Behandlungsmaschine nach einem der Ansprüche 8-13, wobei die Steuereinheit (UC1) durch eine zweite Detektionsschaltung (ECS1) auch mit einem Verbindungspunkt verbunden ist, der sich zwischen dem Kompressor (C) und der aktiven Schaltvorrichtung (RL) oder zwischen der thermischen Schutzschaltung (P) und der aktiven Schaltvorrichtung (RL) befindet.
  15. Behandlungsmaschine nach einem der Ansprüche 1-14, wobei die Steuereinheit (UC1) dazu ausgelegt ist, als Reaktion auf das Detektieren der Aktivierung der thermischen Schutzschaltung (P) eine Korrekturmaßnahme auszuführen, wobei die Korrekturmaßnahme mindestens eines der Folgenden umfasst:
    - Einschalten eines Kompressorkühlgebläses (217);
    - Anpassen einer oberen Schwellenwerttemperatur des Kühlmittels zum Steuern des Einschaltens eines Kompressorkühlgebläses (217);
    - Anpassen einer unteren Schwellenwerttemperatur des Kühlmittels zum Steuern des Ausschaltens eines Kompressorkühlgebläses (217);
    - Anpassen der Rotationsgeschwindigkeit eines Kompressorkühlgebläses (217);
    - Anpassen einer oberen Schwellenwerttemperatur des Kühlmittels zum Steuern des Einschaltens eines Gebläses (221) zum Abkühlen eines Hilfswärmetauschers (219) des Heizpumpensystems;
    - Anpassen einer unteren Schwellenwerttemperatur des Kühlmittels zum Steuern des Ausschaltens eines Gebläses (221) zum Abkühlen eines Hilfswärmetauschers (219) des Heizpumpensystems;
    - Anpassen der Rotationsgeschwindigkeit eines Gebläses (221) zum Abkühlen eines Hilfswärmetauschers (219) des Heizpumpensystems;
    - Abändern einer Sicherheitsschwellenwerttemperatur des Kühlmittels, bei der die Steuereinheit (UC1) den Kompressor (C) mittels der aktiven Schaltvorrichtung (RL) ausschaltet,
    - Anpassen der Rotationsgeschwindigkeit eines Gebläses (207), das dazu ausgelegt ist, das Behandlungsmittel durch die Behandlungskammer (16) strömen zu lassen;
    - Anpassen der Rotationsgeschwindigkeit und/oder der Rotationsrichtung eines Motors (209), der dazu ausgelegt ist, die Behandlungskammer zu Rotation anzutreiben und insbesondere den Zeitraum der Inversionsrotation der Behandlungskammer zu verringern;
    - Anpassen der Rotationsgeschwindigkeit eines Elektrokompressormotors.
EP13731074.4A 2012-06-29 2013-06-17 Wäsche- oder geschirrbehandlungsmaschine Active EP2867400B1 (de)

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PCT/EP2013/062482 WO2014001114A1 (en) 2012-06-29 2013-06-17 A laundry or tableware treating machine
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EP2843118B1 (de) * 2013-08-28 2021-07-07 Electrolux Appliances Aktiebolag Wäschebehandlungsvorrichtung mit Wärmepumpe und Verfahren für den Betrieb eines Kompressors
EP2927366B1 (de) 2014-03-31 2020-09-30 Electrolux Appliances Aktiebolag Wäschebehandlungsvorrichtung und Betriebsverfahren
WO2016138920A1 (en) * 2015-03-02 2016-09-09 Arcelik Anonim Sirketi Heat pump type laundry dryer and method for controlling the same
EP3124689B1 (de) * 2015-07-27 2018-03-07 Electrolux Appliances Aktiebolag Verfahren zum betreiben eines wärmepumpentrockners
EP3124678B1 (de) * 2015-07-27 2018-06-20 Electrolux Appliances Aktiebolag Verfahren zum betrieb einer wärmepumpentrocknungs- und/oder -waschvorrichtung sowie wärmepumpentrocknungs- und/oder -waschvorrichtung
EP3124680B1 (de) * 2015-07-27 2018-06-20 Electrolux Appliances Aktiebolag Verfahren zur anpassung von betriebsparametern beim trocknen in einem wärmepumpentrockner
CN110513915A (zh) * 2019-09-19 2019-11-29 苏州佳瓦智能科技有限公司 一种洗衣机用热泵

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DE102005041145A1 (de) * 2005-08-29 2007-03-01 Alpha-Innotec Gmbh Wäschetrockner
DE102008007971A1 (de) * 2008-02-07 2009-08-13 BSH Bosch und Siemens Hausgeräte GmbH Kondensationstrockner mit Wärmepumpe und Heizung sowie Verfahren zu seinem Betrieb
DE102008041019A1 (de) 2008-08-06 2010-02-11 BSH Bosch und Siemens Hausgeräte GmbH Kondensationstrockner mit einer Wärmepumpe und Erkennung eines unzulässigen Betriebszustands sowie Verfahren zu seinem Betrieb
EP2392722B1 (de) * 2010-06-04 2013-01-16 Electrolux Home Products Corporation N.V. Elektromotor zum Antrieb eines Kompressors
EP2455526A1 (de) * 2010-11-17 2012-05-23 BSH Bosch und Siemens Hausgeräte GmbH Maschine mit Wärmepumpe und zugehörigen Verfahren
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