EP3124678B1 - Verfahren zum betrieb einer wärmepumpentrocknungs- und/oder -waschvorrichtung sowie wärmepumpentrocknungs- und/oder -waschvorrichtung - Google Patents

Verfahren zum betrieb einer wärmepumpentrocknungs- und/oder -waschvorrichtung sowie wärmepumpentrocknungs- und/oder -waschvorrichtung Download PDF

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Publication number
EP3124678B1
EP3124678B1 EP15178405.5A EP15178405A EP3124678B1 EP 3124678 B1 EP3124678 B1 EP 3124678B1 EP 15178405 A EP15178405 A EP 15178405A EP 3124678 B1 EP3124678 B1 EP 3124678B1
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EP
European Patent Office
Prior art keywords
compressor
maxj
refrigerant
value
data
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EP15178405.5A
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English (en)
French (fr)
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EP3124678A1 (de
Inventor
Francesco Cavarretta
Massimo Castiglione
Stefano Zandona
Davide CAMATA
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Electrolux Appliances AB
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Electrolux Appliances AB
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Priority to EP15178405.5A priority Critical patent/EP3124678B1/de
Priority to AU2016204990A priority patent/AU2016204990B2/en
Priority to CN201610597792.4A priority patent/CN106400430B/zh
Publication of EP3124678A1 publication Critical patent/EP3124678A1/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
    • 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
    • D06F25/00—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry and having further drying means, e.g. using hot air 
    • 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
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/42—Safety arrangements, e.g. for stopping rotation of the receptacle upon opening of the casing door
    • 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

Definitions

  • the present invention relates to a method of operation of a drying and/or washing appliance including a heat pump.
  • the method is directed to enhance safety and reduce drying time in a heat pump appliance compared to the appliances of the prior art. Further, the invention relates to a drying and/or washing appliance having a heat pump.
  • Laundry dryers and washer/dryers including a heat pump system are becoming more and more widespread nowadays due to their efficiency and low energy consumption.
  • a compressor is present, which, as the name says, is apt to compress the refrigerant circulating within the heat pump system.
  • the compressor in order to perform its task, includes an electrical motor.
  • compressors employ numerous protection features to provide for safe and reliable operation of the compressor and the corresponding system, e.g. the heat pump system, in which the compressor is incorporated.
  • an internal overload protector may be included in the appliance to prevent the motor of the compressor from exceeding predetermined thermal limits during operation.
  • the incorporation and inclusion of these protection features into a compressor can be very complex and costly to design and implement.
  • OLP generally overload protectors
  • bimetallic switch When the OLP switches due to a too high temperature or current, a relatively long time is generally necessary before it cools down and thus can be switched back in the original position, allowing the re-start of the heat pump. For this reason, the washing or drying cycles become very long and inconvenient for the user.
  • a washing and/or drying appliance Before a washing and/or drying appliance can be introduced in the market, it has to pass several tests in order to prove its safety.
  • One of those, for a heat pump appliance includes operating the appliance under very harsh conditions and one of the test requirements is that the overload protector should not trip, that is, the current flow onto the motor of the compressor should not be interrupted. An accurate control of the temperature of the compressor and of the current absorbed in the motor of the same is thus required in order to avoid the tripping.
  • EP 2 679 718 A1 discloses a laundry or tableware treating machine including a treating chamber where the items can be introduced to be treated with a treating medium, a control unit, a heat pump system including a compressor, 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, controllable by the control unit, for selectively switching ON/OFF the compressor (C), wherein the machine comprises at least a passive switching device, not controllable by control unit, and including a thermo protector circuit adapted to cut the power supply to the compressor when predetermined temperature or voltage load thresholds are exceeded, monitoring means to detect the opening of the thermo protector circuit to cut the power supply to the compressor, 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 and the thermo protector circuit.
  • WO 2009/020322 A2 discloses a clothes-treating apparatus and a controlling method thereof. According to a controlling method of a clothes-treating apparatus, an operational condition of a compressor included in a heat pump to supply dry air to clothes placed therein may be maintained normally. Furthermore, a cooling fan provided in a mechanism compartment is operated only if an internal environment of the mechanism compartment is out of the normal operational condition of the compressor. As a result, a noise because of the operation of the cooling fan may be reduced and duct that happens to be sucked into the mechanism compartment when external air is drawn may be minimized.
  • EP 2 843 118 A1 discloses a method of operating a compressor in a laundry treatment apparatus, in particular laundry dryer or washer-dryer, wherein the laundry treatment apparatus comprises a heat-pump system having a compressor adapted to circulate a refrigerant through the heat-pump system during a laundry drying operation and wherein the laundry treatment apparatus comprises a control unit controlling the operation of the laundry treatment apparatus.
  • the operation of the compressor is suspended, the operation of the compressor is restarted upon receiving a restarting signal.
  • the value of power or current supplied to the compressor after restarting the compressor operation is monitored and the compressor operation is maintained or suspended again in dependency of the monitored value of power or current.
  • a laundry treatment apparatus adapted to implement the method.
  • the requirement of working in such a safe field or working area is generally assured by the presence of a passive switch which interrupts the power supply to the heat pump compressor when predetermined thresholds of heat or current (or voltage load) are exceeded.
  • the passive switch - or the OLP - 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, because also in this case a high current causes the bimetallic switch to overheat and reach the switching temperature.
  • the passive switch e.g. a thermo-protector such as the OLP
  • the passive switch is adapted to go back to operative status closing the circuit; however there is a considerable delay before this happens.
  • compressor OLP has a big inertia for turning back to the closed position, typically about 30 minutes.
  • the Applicant has realized that a control of both the current and the temperature is needed in order to solve the aforementioned problem.
  • the invention relates to a method to operate a laundry washing and/or drying appliance including
  • the invention relates to a laundry washing and/or drying appliance including:
  • the appliance of the invention may be preferably a laundry dryer, a laundry washer dryer or a washing machine.
  • a heat pump appliance includes a treating chamber, such as a drum, in which the load of laundry, e.g., clothes, or other items to be washed and/or dried are placed.
  • the treating chamber is part of a process circuit, in particular for example a closed-loop air circuit in case of a condensed dryer or an open air circuit in case of a vented dryer, which in both cases includes an air duct for channelling a stream of air to dry the load.
  • the process air circuit is connected with its two opposite ends to the treating chamber. For example, in the case of a dryer, hot dehumidified air is fed into the treating chamber, flowing over the laundry, and the resulting humid cool air exits the same.
  • the humid air stream rich in water vapor is then fed into an evaporator of a heat pump, where the moist warm process air is cooled and the humidity present therein condenses.
  • the resulting cool dehumidified air is then either vented outside the appliance in the ambient where the latter is located or it continues in the closed-loop circuit.
  • the dehumidified air in the process air circuit is then heated up before entering again in the drying chamber by means of a condenser of the heat pump, and the whole loop is repeated till the end of the drying cycle.
  • ambient air enters into the drum from the ambient via an inlet duct and it is heated up by the condenser of the heat pump before entering the drying chamber.
  • Different circuits are known in the art in case of a washing machine or a washer-dryer.
  • the heat pump of the laundry appliance includes a refrigerant circuit in which a refrigerant can flow and which connects via piping a first heat exchanger or condenser, a second heat exchanger or evaporator, a compressor and a pressure-lowering device.
  • the refrigerant is pressurized and circulated through the system by the compressor.
  • the hot and highly pressurized vapor is cooled in the first heat exchanger, called the condenser, until it condenses into a high pressure, moderate temperature liquid, heating up the process air before the latter is introduced into the drying chamber.
  • the condensed refrigerant then passes through the pressure-lowering device such as an expansion device, e.g., a choke, a valve or a capillary tube.
  • the low pressure liquid refrigerant then enters the second heat exchanger, the evaporator, in which the fluid absorbs heat and evaporates due to the heat exchange with the warm process air exiting the drying chamber.
  • the refrigerant then returns to the compressor and the cycle is repeated.
  • the compressor In order to compress the refrigerant, the compressor includes an electric motor which is commonly powered by a current, for example a current coming from the mains.
  • the compressor in order to work in safety conditions, should not overheat, that is, there is a field of working conditions, function of the temperature of the compressor and of the absorbed current of the electric motor of the compressor, in which the compressor can work without overheating.
  • the field of safe working conditions for the compressor is generally delimited by a compressor curve such the one depicted in fig. 5 .
  • the curve which delimits the "real" safety field of the compressor as given by the compressor manufacturer (or as obtained by field tests) is called "compressor curve".
  • this curve may represent a tripping curve of the OLP, that is, the curve of fig. 5 represents the temperature vs. current curve above which the OLP interrupts the supply of current to the compressor.
  • the tripping curve of the OLP is generally provided, in a current-Temperature graph, as a triplet of curves having an "average" central curve comprised between two curves representing a minimum curve and a maximum curve.
  • the area comprised between the minimum and the maximum curves indicates combinations of current and temperatures values that may cause tripping of OLP, i.e. and area where the OLP tripping may be possible, but not ensured.
  • the central curve is the "average" curve for OLP tripping.
  • the area beyond the maximum curve indicates that for points in such an area the OLP certainly trips, while the area below the minimum curve indicates that for points in such an area the OLP does not trip.
  • the triplet of curves will be called simply the "OLP curve”.
  • the safety field curve of the compressor (compressor curve) and the tripping curve of the OLP may not coincide, however the OLP tripping curve is generally below or equal the compressor curve, so that the compressor having an OLP can always work under safety conditions.
  • This curve although as said could be represented as a "strip" of values comprised between a maximum and a minimum curve, marks the boundary above which the OLP trips and it is called in the following "OLP tripping strip".
  • a predetermined safety field area or space is selected, in terms of temperature of the compressor and current to the compressor motor, in which it is desired that the compressor works.
  • the control of the invention assures that the compressor is substantially only working in this predetermined safety field.
  • a plurality of data couples which delimits the predetermined safety work field space is obtained and stored, for example in a memory inside the laundry appliance.
  • Such plurality of data couples could be a plurality of discrete couples, such as in a look up table, or a continuous curve.
  • Each couple of the plurality includes a first element which is a value function of the maximum acceptable temperature by the compressor and a second element which is a value function of the maximum acceptable current absorbed by the compressor electric motor for the value of the temperature defined in the first element.
  • Each couple therefore sets a "boundary-point" of the predetermined safety work field space of the compressor, that is, for values of current and/or temperature above such a point, the compressor is not working in the chosen predetermined safety field.
  • Each data couple could be considered for example as a point belonging to the curve of fig. 5 . It is to be understood that the predetermined safety field space could be different from the safety field space of the compressor as certified by the manufacturer, as detailed below.
  • T MAXj is the j-th value function of the maximum temperature which is considered to be safe for the compressor at an absorbed current equal to i MAXj , or vice-versa the couple can be seen as the maximum absorbed current i MAXj which is considered to be safe for the compressor at a temperature of the compressor equal to T MAXj .
  • T MAXj Given a temperature value, therefore, from the look up table, the maximum current which can be absorbed by the compressor at such a temperature value can be checked and, in the same way, given a current value, from the look up table, the maximum working temperature at which the compressor can work when its motor absorbs such a current can be checked as well.
  • Each couple thus includes a first element, in the depicted table the temperature of the compressor, and an associated second element, the current absorbed by the electric motor of the compressor.
  • the temperature and current values could also be swopped for each couple, so that the current is the first element and the temperature the second element.
  • a continuous curve which can be considered as made of an infinite number of data couples, instead of a look up table (which is defined as a finite number of data couples) can be stored inside the laundry appliance.
  • a curve called in the following "stored curve” can have any shape as long as it is below or it coincides with the curve of fig. 5 taken for a specific compressor.
  • a continuous curve is considered as a plurality of data couples, where the plurality is equal to infinity, so that the wording "a plurality of data couples" indicates both the look up table and the continuous curve.
  • both the above curves can be stored, for example in a memory of the laundry appliance.
  • these curves or look up tables can be stored in a control unit of the appliance.
  • the curve is made of an infinite number of couples, i.e. j is infinite, where the first element is the temperature (or the current) and the second element the derived (from the equation) corresponding current (or temperature).
  • the data couples in the look-up table or the stored continuous curve are in each point always below or equal to the safety curve known for a given compressor, that is, the stored curve or the couples in the look-up table are always below the compressor curve.
  • a curve or look-up table couples can be also below or equal to the OLP tripping strip for which the OLP trips.
  • the stored curve or look up table couples could be below both the compressor curve and the OLP tripping strip without intersecting them in any point.
  • the trend of the curve or of the couples in the look-up table stored in the laundry appliance can be arbitrary, they can form for example a step curve.
  • the look-up table or stored continuous curve is specific for a given compressor If a different compressor is used, preferably a different look-up table or curve is used as well.
  • a first measurement for example by means of a temperature sensor, is performed so as to acquire a value which is indicative of the temperature of the compressor.
  • the temperature value measured does not have to be the temperature of the compressor, but it can be the temperature of another element, as long as it is possible to derive from it the temperature of the compressor.
  • a second measurement is performed of a value indicative of the current absorbed by the motor of the compressor.
  • the absorbed current can be measured in different ways. However, also a different value can be measured, and not directly the absorbed current of the motor, as long as the absorbed current can be derived from it. A voltage measurement could be performed as well.
  • the two measurements are performed substantially at the same time t.
  • the results of the measurements are two values representing - or function of - the temperature of the compressor at the time t, T M , and of the current absorbed by the electric motor of the compressor at time t, i M .
  • the measured values are then compared, for example by means of the control unit, to the stored data couples, either in form of look up tables or curves.
  • the measured temperature is compared with the first elements (in this first embodiment, just by way of example, it is considered that the temperature is the first element and the current the second element of each stored couple) of the j stored couples.
  • a specific couple is found for which the measured T M is closest in value to the stored T MAXj , that is, a couple (T MAXj* , i MAXj* ) is searched in the lookup table for which
  • min j (
  • all d j can be calculated for all couples with j from 1 to last and the couple having the minimum d j - called d j* - is selected.
  • the minimum distance d j* between the measured temperature and the closest value found among the couples, that is T MAXj* is equal to or below 0.5 °C.
  • This second element i MAXj* is then compared to the measured value of the current, that is, the second element of the couple is compared to i M . If the measured current is above the maximum allowed current for the given temperature, then the compressor at time t is working outside the safety field area. This happens if i M ⁇ i MAXj * .
  • T M the value of the selected point in the stored curve.
  • the measured current is compared with the second elements (in this second embodiment it is also considered that the temperature is the first element and the current the second element of each stored couple) of the stored couples.
  • a specific couple (T MAXj* , i MAXj* ) is found for which the measured i M is closest in value to the stored i MAXj , that is, a couple is searched in the lookup table for which
  • min j (
  • the minimum distance d j* between the measured current and the closest value found among the couples, that is i MAxj* is equal to or below 0.1 A.
  • the fact that there is not a precise match between the second element of the closest stored couples and the measured value is due to the discrete nature of the look-up table, however it is preferred that there are enough couples in the look-up table that the predetermined boundary field is sampled each 0.1 A at least.
  • a given T MAXj* is associated, that is the i MAXj* for which
  • min j (
  • This first element T MAXj* is then compared to the measured value of the temperature, that is, the second element is compared to T M . If the measured current is above the maximum allowed temperature for the given current, then the compressor at time t is working outside the safety field area. This happens if T M ⁇ T MAXj * .
  • i M the value of the selected point in the stored curve.
  • the compressor receives a limitation in the power supply, which may include a power reduction or a complete power cut.
  • the step of limiting the power supply to the compressor could include to supply the compressor with a reduced power or with no power at all, that is, for example the power to the motor of the compressor is cut off, because the compressor is not working in the prescribed temperature/current field.
  • the decision whether the power is reduced or cut off completely depends, among others, on the choice of the predetermined safety field, which in turn imply the choice of the stored curve or of the couples of the look-up table.
  • the predetermined safety field coincides - as in the embodiment a. - with the real boundary for a safe functioning of the compressor (the compressor curve), when such a safety field is exceeded, it is preferred to cut the power supply completely.
  • the predetermined safety field coincides - as in the embodiment a. - with the real boundary for a safe functioning of the compressor (the compressor curve), when such a safety field is exceeded, it is preferred to cut the power supply completely.
  • a safety field coincides - as in the embodiment a. - with the real boundary for a safe functioning of the compressor (
  • the power to the compressor is limited because there is the risk that the compressor may overheat or the OLP may trip.
  • the control of the invention prevents the OLP from tripping because it interrupts or limit the flow of current to the compressor electric motor even before the activation of the OLP, being all the data couples or stored curve below the tripping curve of the OLP.
  • all the data couples or stored curve are below the minimum curve which envelops the OLP tripping strip. In this way, the compressor can be cooled and restarted in a much quicker way than in cases in which the OLP interrupts the current flows.
  • the method and appliance of the invention act as a "double security", so that in case of a double failure of two components in a control circuit in the laundry appliance, the compressor still will not overheat, being shut down or having a more limited power either by the OLP or by the control of the invention.
  • control of the invention forces the compressor to work always in the predetermined safety field of operation, because otherwise - outside such a field - the current to the compressor is cut off or reduced.
  • OLP organic light-semiconductor
  • the laundry appliance of the invention and/or operating according to the method of the invention could also be "OLP-free", that is the control of the invention allows removing the OLP from the laundry appliance and at the same time guaranteeing the same safety level.
  • the data couples of the look-up table or the stored curve can include points lying on the compressor curve or be the compressor curve itself (embodiment a.).
  • the invention may include in combination or alternatively any of the following characteristics.
  • limiting power supply to the compressor includes:
  • a first possibility is to stop the electric motor of the compressor, switching it off. In this case a complete power cut is obtained.
  • a second possibility is to change, such as to reduce, the rotational speed of the motor of the compressor. In this way the limitation of the power supply is obtained.
  • the method of the invention further comprises:
  • one or more possible corrective actions can take place in order to modify the compressor status so that it can be moved as soon as possible back into the safe working field, so that the cycle is not interrupted for a very long time.
  • Such corrective actions in case a compressor fan is present to blow air onto the compressor, can be: immediately switch on the compressor cooling fan to decrease the time needed by compressor to cool. This action is useful when a current absorption peak is present, since when the power cut off is due to excessive heat it is likely that the fan is already on.
  • control unit may modify an upper threshold temperature of the refrigerant which drives the switching on of the compressor cooling fan and/or modify a lower threshold temperature of the refrigerant which drives the switching off of the compressor cooling fan to ensure better compressor cooling.
  • the upper threshold temperature of the refrigerant at which the fan is switched on can be decreased.
  • the lower threshold temperature of the refrigerant at which the fan is switched off could be decreased.
  • a further alternative could be to modify the rotational speed of the fan, e.g. above a predetermined refrigerant temperature, to improve the cooling of the compressor, particularly increasing the rotational speed of the fan.
  • the ON/OFF ratio of the compressor cooling fan is changed, and preferably increased.
  • the method when said process medium is drying air flowing in a process drying air circuit and said apparatus is apt to dry items, comprises:
  • modifications to the process fan motor parameters may be applied to try to ensure better cycle conditions.
  • An option could be to modify, in particular to increase, the motor speed of the process fan to ensure higher air flow.
  • another solution could be to increase motor speed during motor rotation direction inversion phase to increase the available drying air flow during this phase.
  • the method further comprises:
  • drum motor reversing behavior is relevant when a single motor drives both the process fan and the treating chamber.
  • the rotation direction of the motor is changed to better tumble the laundry, however the process fan provides only a part of the nominal flow rate available when the process fan rotates in the main direction and the decrease of dying air flow can worsen compressor working condition.
  • the method comprises:
  • comparing said measured temperature value T M and said measured current value i M with said plurality of data couples includes:
  • the curve or the lookup table stored in the appliance could delimit the safety working field area of the compressor, obtained for example from test studies on the compressor, from the manufacturer, etc. (embodiment a.), or could be similar to a characteristic strip of the OLP which might be present in the appliance (embodiment b.), or could be positioned below both the OLP tripping strip and the compressor curve (embodiment c.) depending on the chosen predetermined safety field.
  • the measured current absorbed by the motor of the compressor at a given measured temperature should be not only lower than the point in the curve or value in the lookup table at about the same temperature, but also lower than that value plus at least an extra "safety addition", which is called safety value i safety .
  • T M the couple having the closest value of the first element to this measured value is selected.
  • min j (
  • the second element of the couple i MAXj* is then compared to the measured value i M and it is checked whether
  • the power to the compressor is limited.
  • the power to the compressor because this safety value i safety is an additional safety on top of the already existing safety shift of the stored curve or look-up table with respect to the real boundary of the compressor safety field.
  • the power to the compressor is reduced if i M ⁇ i MAXj* , otherwise the compressor is switched off.
  • the method comprises:
  • comparing said measured temperature value T M and said measured current value i M with said plurality of data couples includes:
  • the method includes:
  • any of the possible corrective actions above discussed, or others, may lead to a cooling down of the compressor in a rather quick time frame, in general quicker than the cooling down of an OLP.
  • the compressor can be thus switched on again after a predetermined time has elapsed, or the power supply can come back to "normal", if the temperature of the compressor (which could be the temperature of the refrigerant) has become stabilized below a given threshold.
  • the "normal" power supply depends generally on the drying cycle, or, in general, the laundry treatment cycle, selected by a user and it is stored, for example, in a control unit of the laundry dryer. In this way, if the compressor has been switched off, it can be switched on again relatively rapidly.
  • an additional feedback on the temperature can be present, that is, the compressor can be switched on again after the predetermined time has elapsed only if also the compressor temperature is below a given threshold. If the power has been only reduced, then such power can also go back to the value it had before the power limitation was made, depending on the temperature of the compressor. Also in this case for example an additional feedback loop can be present, so that in addition of being below a threshold, a given time has to elapse before the compressor can be supplied at a predetermined power.
  • the method comprises:
  • the measurements of the current absorbed by the compressor and the compressor temperature are preferably performed continuously during the cycle of washing and/or drying to continuously check the working conditions of the compressor.
  • the measurements of current and temperature are taken only after a transient regime in which the heat pump "warms up".
  • the measurements can be taken only after the temperature of refrigerant or of the compressor has reached a lower threshold.
  • the temperature and current measurements are taken immediately after the drying cycle has started because the risk of anomalous current peaks is present and the OLP is not available to switch OFF the power supply.
  • the method includes:
  • a preferred method is thus storing curves in a continuous form, i.e. without solution of continuity, for example in the control unit of the appliance.
  • the temperature sensor can be for example a NTC or PCT thermistor.
  • said temperature sensor is located, in the drying appliance, at a refrigerant outlet provided on said compressor or on a part of a housing shell of said compressor.
  • the temperature sensor is located in a position where it can best determined the temperature of the compressor. With temperature of the compressor also the temperature of the refrigerant flowing in the compressor can be meant. In order to measure such temperature, the sensor is either located at the refrigerant outlet to measure the temperature of the refrigerant, or within the housing shell of the compressor, in particular at a part of such shell which is more subject to heat.
  • the housing shell of the compressor houses the compressor, its electric motor and the compression devices to compress the refrigerant.
  • the drying appliance includes an overload protector, said plurality of data or continuous curve being a characteristic curve of said overload protector.
  • Said characteristic curve may be either the minimum curve or the maximum curve which envelop the OLP tripping strip.
  • the laundry appliance includes a compressor which is free from an overload protector.
  • control on the temperature of the compressor and current absorbed by the compressor electric motor may be a further safety in addition to the OLP or a substitute to the OLP itself.
  • the OLP tripping is prevented and further in case of a malfunctioning of the control, the OLP intervenes; in the second case the removal of a component in the appliance is achieved, reducing costs and complexity of assembly.
  • said laundry appliance comprises a further electric motor to drive into rotation said treating chamber and/or a blower, or, in general, a pumping device, propelling said process medium.
  • a dryer without washing capabilities includes a single motor driving both the process air fan or blower and the treating chamber.
  • washer-dryer includes two different motors, one bringing into rotation the treating chamber, and the other one for commanding the blower of the process air or process medium.
  • the drying appliance includes an active switch commanded by said processing unit to cut off power to said compressor.
  • the laundry appliance includes a variable speed compressor.
  • Active switch and/or variable speed compressor are possible means used to limit the power supply to the compressor itself. A complete cut off of the power is obtained by the activation of the switch, while a power reduction is obtained reducing the speed of the compressor.
  • a laundry dryer realized according to the present invention is globally indicated with 1.
  • the laundry appliance of the invention could comprise a dryer, a washer-dryer or a washing machine.
  • Laundry dryer 1 comprises an outer box or casing 2, preferably but not necessarily parallelepiped-shaped, and a treating chamber, such as a drum 3, for example having the shape of a hollow cylinder, for housing the laundry and in general the clothes and garments to be dried.
  • the drum 3 is preferably rotatably fixed to the casing 2, so that it can rotate around a preferably horizontal axis R (in alternative embodiments, rotation axis may be tilted).
  • Access to the drum 3 is achieved for example via a door 4, preferably hinged to casing 2, which can open and close an opening 4a realized on the casing itself.
  • casing 2 generally includes a front wall 20, a rear wall 21 and two lateral walls 25, all mounted on a basement 24.
  • the basement 24 is realized in polymeric material.
  • basement 24 is molded via an injection molding process.
  • the door 4 is hinged so as to access the drum.
  • the casing, with its walls, defines the volume of the laundry dryer 1.
  • basement 24 includes an upper and a lower shell portion 24a, 24b (visible in Figure 3 detailed below).
  • the dryer 1, and in particular basement 24 defines an horizontal plane (X,Y) which is substantially the plane of the ground on which the dryer 1 is situated, thus it is considered to be substantially horizontal, and a vertical direction Z perpendicular to the plane (X,Y).
  • Laundry dryer 1 also preferably comprises an electrical motor assembly 50 for rotating, on command, revolving drum 3 along its axis inside casing 2.
  • Motor 50 includes a shaft 51 which defines a motor axis of rotation M (see figure 3 ).
  • laundry dryer 1 may include an electronic control unit 100 (visible in figure 4 ) which controls both the electrical motor assembly 50 and other components of the dryer 1 to perform, on command, one of the user-selectable drying cycles preferably stored in the same control unit.
  • the programs as well other parameters of the laundry dryer 1, or alarm and warning functions can be set and/or visualized in a control panel 11, preferably realized in a top portion of the dryer 1, such as above door 4.
  • the control unit 100 may comprise one or more printed control boards.
  • the rotatable drum 3 includes a mantle, having preferably a substantially cylindrical, tubular body, which is preferably made of metal or polymeric material and is arranged inside the casing 2 and apt to rotate around the general rotational axis R which can be - as said - horizontal, i.e. parallel to the (X, Y) plane, or tilted with respect to the latter.
  • Drum 3 may be an open drum, i.e. with both ends are open, or it may include a back wall (not shown in the appended drawings) fixedly connected to the mantle and rotating with the latter.
  • support elements for the rotation of the drum are provided as well in the laundry of the invention.
  • Such support elements might include rollers at the front and/or at the back of the drum, as well as or alternatively a shaft connected to the rear end of the drum (shaft is not depicted in the appended drawings).
  • shaft is not depicted in the appended drawings.
  • a roller 10 connected to the basement via a boss 101 is depicted.
  • Any support element for the rotation of the drum around axis R is encompassed by the present invention.
  • Dryer 1 additionally includes a process air circuit which comprises the drum 3 and an air process conduit 18, depicted as a plurality of arrows showing the path flow of a process air stream through the dryer 1 (see Figures 3 and 4 ).
  • a portion of the air process conduit 18 is formed by the connection of the upper shell 24a and the lower shell 24b.
  • Air process conduit 18 is preferably connected with its opposite ends to the two opposite sides of drum 3, i.e. first and second endof mantle.
  • Process air circuit also includes a fan or blower 12 (shown in Figs. 3 and 4 ).
  • a dedicated motor can be coupled to the fan 12, but in a possible simpler implementation the same motor can operate the fan 12 and the drum 3 (in other words only one of the two motors can be present, such as motor 50).
  • the dryer 1 of the invention additionally comprises a process air generator, in the depicted embodiment a heat pump system 30 including a first heat exchanger (called also condenser) 31 and a second heat exchanger (called also evaporator) 32.
  • Heat pump 30 also includes a refrigerant closed circuit (partly depicted) in which a refrigerant fluid flows, when the dryer 1 is in operation, cools off and may condense in correspondence of the condenser 31, releasing heat, and warms up, in correspondence of the second heat exchanger (evaporator) 32, absorbing heat.
  • a compressor receives refrigerant in a gaseous state from the evaporator 32 and supplies the condenser 31, thereby closing the refrigerant cycle.
  • the heat exchangers are named either condenser and evaporator or first and second heat exchanger, respectively. More in detail, the heat pump circuit connects via piping 35 (see Fig. 3 ) the second heat exchanger (evaporator) 32 via a compressor 33 to the condenser 31.
  • the outlet of condenser 31 is connected to the inlet of the evaporator 32 via an expansion device 103, such as a choke, a valve or a capillary tube.
  • Compressor 33 is driven by an electric motor (not visible in the figures), preferably integrated with the compressor in the same housing.
  • the compressor is a variable speed compressor so that the compressing velocity can be modified.
  • the laundry dryer 1 of the invention may include a condensed-water canister (also not visible) which collects the condensed water produced, when the dryer 1 is in operation, inside evaporator 32 by condensation of the surplus moisture in the process air stream arriving from the drying chamber (i.e. drum) 3.
  • the canister is located at the bottom of the evaporator 32.
  • the collected water is sent in a reservoir located in correspondence of the highest portion of the dryer 1 so as to facilitate a comfortable manual discharge of the water by the user of the dryer 1.
  • the condenser 31 and the evaporator 32 of the heat pump 30 are located in correspondence of the process air conduit 18 formed in the basement 24.
  • the condenser 31 is located downstream of the evaporator 32.
  • the air exiting the drum 3 enters the conduit 18 and reaches the evaporator 32 which cools down and dehumidifies the process air.
  • the dry cool process air continues to flow through the conduit 18 till it enters the condenser 31, where it is warmed up by the heat pump 30 before re-entering the drum 3.
  • an air heater such as an electrical heater
  • heat pump 30 and heater can also work together to speed up the heating process (and thus reducing the drying cycle time).
  • a cooling fan 38 is provided to cool down the compressor 33 (the cooling fan is schematically depicted in fig. 4 ).
  • the cooling fan 38 may for example draw air from the outside of the casing 2 and blow it towards the compressor 33.
  • the control unit 100 preferably operates the compressor cooling fan 38 and the process fan 12. Further, control unit 100 preferably receives information by a monitoring system for monitoring the status of the compressor.
  • the control unit 100 can be electrically connected to a sensor 39 to detect the temperature of the refrigerant or of the compressor and/or to a sensing circuit 37 to detect a value and/or a change of potential and/or current absorbed by the compressor's electric motor.
  • the sensing circuit 37 is for example integrated in the compressor 33 or in the control unit 100 itself.
  • the temperature sensor 39 also connected to the control unit 100, is used to measure the value of the temperature of the compressor, which can be also the temperature of the flowing refrigerant.
  • an NTC thermistor is placed in such a way to measure the compressor temperature at the refrigerant outlet from the compressor, or within the same compressor housing where also the compressor electric motor is included.
  • the temperature sensor 39 can be arranged at different location of the heat pump system.
  • a signal having a value from which the temperature of the compressor can be derived and a signal having a value from which a value of the current absorbed by the motor of the compressor can be derived are sent to the control unit 100 by the temperature sensor 38 and the sensing circuit 37, respectively.
  • the control unit 100 includes one or more memories (not shown), including a curve delimiting a safety area for the compressor, that is a curve which delimits the safety working field for the compressor.
  • the control unit 100 monitors the status of the compressor 33 monitoring the temperature and current values coming from the aforementioned sensors 37 and 39.
  • Each appliance 1 has a curve such the one above written stored in the memory of the control unit 100, and which depends on compressor 33 and on a selected predetermined safety field for the compressor.
  • the curve can have a shape such the one depicted in figure 5 , however any shape and trend is possible as long as the compressor is within the predetermined safety working area when working below this delimiting curve.
  • the measured temperature and current values obtained in a step 2F of the method, or the values from which the temperature of the compressor and the absorbed current of the motor of the compressor can be derived are compared with the stored curve, as depicted in step 3F of figure 6 .
  • step 4F If the temperature and current measurements identify a point in the (i.T) space above such a stored curve (see step 4F), then the power to the compressor (in particular to its motor) is limited because it means that the compressor is overheated (step 5F). If not, that is, if the point of the measured values (T M , i M ) identify a point below such a stored curve, then the compressor in working under safe conditions and the cycle of the laundry appliance can continue and the measurement of the current and the temperature of the compressor can continue in order to keep the checking of the compressor's status.
  • the limitation of the power supply can be a complete cut off of the power to the compressor, for example, by means of a switch (not depicted in the drawings) or a reduction of the speed of the electric motor of the compressor.
  • the method replaces step 4F as modified according to figure 7 , where step 4aF is depicted.
  • T safety , i safety are constant. In this embodiment a further safety is introduced.

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  • Engineering & Computer Science (AREA)
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Claims (16)

  1. Verfahren zum Betreiben einer Wäschewasch- und/oder Wäschetrocknungsvorrichtung (1), aufweisend
    • eine Behandlungskammer, in die Wäsche eingebracht und in der sie mit einem Prozessmedium behandelt wird;
    • ein Wärmepumpensystem (30) mit einem Kältemittelkreislauf (38), in dem ein Kältemittel fließen kann, wobei der Kältemittelkreislauf (38) einen ersten Wärmetauscher (31), in dem das Kältemittel abgekühlt wird, einen zweiten Wärmetauscher (32), in dem das Kältemittel erwärmt wird, einen Verdichter (33) zum Beaufschlagen des Kältemittels mit Druck und Führen des Kältemittels durch den Kältemittelkreislauf, wobei der Verdichter (33) einen Elektromotor aufweist, und eine Druckabsenkvorrichtung (34) aufweist; wobei der erste und/oder zweite Wärmetauscher in der Lage ist bzw. sind, einen Wärmeaustausch zwischen dem in dem Kältemittelkreislauf (38) fließenden Kältemittel und dem Prozessmedium vorzunehmen;
    wobei das Verfahren dadurch gekennzeichnet ist, dass es Folgendes umfasst:
    • Speichern einer Vielzahl (j) von Datenpaaren, wobei ein erstes Element jedes Datenpaars von einem Stromhöchstwert iMAXj für den Strom des Verdichter-Elektromotors abhängig ist, und das zweite Element des Paars entsprechend von einem Verdichter-Temperaturhöchstwert TMAXj abhängig ist, der dem Stromhöchstwert iMAXj des ersten Elements zugehörig ist, wobei die Vielzahl von Datenpaaren einen vorher festgelegten Sicherheitsarbeitsraum für den Verdichter begrenzt;
    • im Wesentlichen zur gleichen Zeit Messen eines repräsentativen Temperaturwerts TM für die Temperatur des Verdichters und eines repräsentativen Stromwerts iM für den Strom, den der Elektromotor des Verdichters aufnimmt, während die Wärmepumpe in Betrieb ist;
    • Vergleichen des gemessenen Temperaturwerts TM und des gemessenen Stromwerts iM mit der Vielzahl von Datenpaaren; und
    • Begrenzen der Stromzufuhr zum Verdichter, was Folgendes umfasst:
    ▪ Ausschalten des Verdichter-Elektromotors oder
    ▪ Einstellen einer Drehzahl des Verdichter-Elektromotors,
    wenn:
    ∘ in der Vielzahl ein Datenpaar (TMAXj*, iMAXj*) vorhanden ist, für das | T MAXj * − T M | = min j | T M − T MAXj |
    Figure imgb0016
     und iM ≥iMAXj* oder
    ∘ in der Vielzahl ein Datenpaar (TMAXj*, iMAXj*) vorhanden ist, für das | i MAXj * − i M | = min j | i M − i MAXj |
    Figure imgb0017
     und TM ≥TMAXj*.
  2. Verfahren nach Anspruch 1, ferner umfassend:
    • Vorsehen eines Verdichterkühlgebläses in der Nähe des Verdichters; und, wenn die Stromversorgung des Verdichters unterbrochen wurde, eins oder mehrere aus Folgendem:
    ▪ Einschalten des Verdichter-Kühlgebläses;
    ▪ Einstellen einer oberen Temperaturschwelle des Kältemittels zum Bewirken des Einschaltens des Verdichter-Kühlgebläses;
    ▪ Einstellen einer unteren Temperaturschwelle des Kältemittels zum Bewirken des Ausschaltens des Verdichter-Kühlgebläses;
    ▪ Einstellen einer Drehzahl eines Verdichter-Kühlgebläses;
    ▪ Einstellen eines Ein-Aus-Verhältnisses des Verdichter-Kühlgebläses.
  3. Verfahren nach einem der vorhergehenden Ansprüche, wobei das Prozessmedium Trocknungsluft ist, die in einem Prozesstrocknungsluftkreislauf strömt, und wobei die Vorrichtung in der Lage ist, Objekte zu trocknen, umfassend:
    • Vorsehen eines Prozessgebläses zum Umwälzen von Luft in dem Prozesstrocknungsluftkreislauf; und, wenn die Stromversorgung des Verdichters unterbrochen wurde, eins oder mehrere aus Folgendem:
    ▪ Einschalten oder Eingeschaltetlassen des Prozessgebläses;
    ▪ Einstellen einer Drehzahl des Prozessgebläses.
  4. Verfahren nach einem oder mehreren der vorhergehenden Ansprüche, ferner umfassend:
    Einstellen einer Drehzahl und/oder eines Verhältnisses von Rechtslauf/Linkslauf eines Motors, der so ausgelegt ist, dass er die Behandlungskammer in Drehung versetzt.
  5. Verfahren nach einem oder mehreren der vorhergehenden Ansprüche, umfassend:
    • Einstellen eines Sicherheitsschwellenwerts isafety;
    und wobei das Vergleichen des gemessenen Temperaturwerts TM und des gemessenen Stromwerts iM mit der Vielzahl von Datenpaaren Folgendes umfasst:
    • Vergleichen des gemessenen Temperaturwerts TM mit der Vielzahl von Datenpaaren;
    • Bestimmen eines Datenpaars (TMAXj*, iMAXj*), für das | T MAXj * − T M | = min j | T M − T MAXj | ;
    Figure imgb0018
    • Vergleichen eines Stromhöchstwerts iMAXj* des Datenpaars, der dem bestimmten nächstliegenden Temperaturhöchstwert TMAXj* entspricht, mit dem gemessenen Stromwert iM;
    • Begrenzen der Stromzufuhr zum Verdichter, wenn |i MAXj*-iM | ≤ isafety.
  6. Verfahren nach einem oder mehreren der vorhergehenden Ansprüche, umfassend:
    • Einstellen eines Sicherheitsschwellenwerts Tsafety;
    und wobei das Vergleichen des gemessenen Temperaturwerts TM und des gemessenen Stromwerts iM mit der Vielzahl von Datenpaaren Folgendes umfasst:
    • Vergleichen des gemessenen Stromwerts iM mit der Vielzahl von Datenpaaren;
    • Bestimmen eines Datenpaars (TMAXj*, iMAXj*), für das | i MAXj * − i M | = min j | i M − i MAXj | ;
    Figure imgb0019
    • Vergleichen eines Temperaturhöchstwerts TMAXj* des Datenpaars, der dem bestimmten nächstliegenden Stromhöchstwert iMAXj* entspricht, mit dem gemessenen Temperaturwert TM;
    • Begrenzen der Stromzufuhr zum Verdichter, wenn |T MAXj* -TM | ≤ Tsafety.
  7. Verfahren nach einem oder mehreren der vorhergehenden Ansprüche, das Folgendes umfasst:
    • erneutes Einschalten des Verdichters, nachdem ein vorher festgelegter Zeitraum seit dem Ausschalten des Verdichtermotors vergangen ist;
    • Wiederherstellen der Stromzufuhr zum Verdichter so, wie sie war, bevor die Begrenzung der Stromzufuhr erfolgte; oder
    • Versorgen des Verdichters mit einem Strom, der von einem ausgewählten Trockengang abhängt, wenn der gemessene Temperaturwert TM unter einer vorher festgelegten Schwelle liegt.
  8. Verfahren nach einem oder mehreren der vorhergehenden Ansprüche, umfassend:
    • Wiederholen des Schritts des Messens, im Wesentlichen zur gleichen Zeit, eines Temperaturwerts TM des Verdichters und eines Stromwerts iM des Verdichter-Elektromotors, während der Motor bei einer bestimmten elektrischen Frequenz läuft.
  9. Verfahren nach einem oder mehreren der vorhergehenden Ansprüche, wobei ein Speichern einer Vielzahl (j) von Datenpaaren, wobei ein erstes Element jedes Datenpaars von einem Stromhöchstwert iMAXj für den Strom des Verdichter-Elektromotors abhängig ist, und das zweite Element des Paars entsprechend von einem Verdichter-Temperaturhöchstwert TMAXj abhängig ist, der dem Stromhöchstwert iMAXj des ersten Elements zugehörig ist, wobei die Vielzahl von Datenpaaren einen vorher festgelegten Sicherheitsarbeitsraum für den Verdichter begrenzt, Folgendes umfasst:
    Speichern einer ersten Kurve in der Form iMAX = f(TM) und TM ist stetig; und
    Speichern einer zweiten Kurve in der Form TMAX = g(iM) und iM ist stetig.
  10. Wäschewasch- und/oder Wäschetrocknungsvorrichtung, aufweisend:
    • eine Behandlungskammer, in die Wäsche eingebracht und in der sie mit einem Prozessmedium behandelt wird;
    • ein Wärmepumpensystem (30) mit einem Kältemittelkreislauf (38), in dem ein Kältemittel fließen kann, wobei der Kältemittelkreislauf (38) einen ersten Wärmetauscher (31), in dem das Kältemittel abgekühlt wird, einen zweiten Wärmetauscher (32), in dem das Kältemittel erwärmt wird, einen Verdichter (33) zum Beaufschlagen des Kältemittels mit Druck und Führen des Kältemittels durch den Kältemittelkreislauf, wobei der Verdichter (33) einen Elektromotor aufweist, und eine Druckabsenkvorrichtung (34) aufweist; wobei der erste und/oder zweite Wärmetauscher in der Lage ist bzw. sind, einen Wärmeaustausch zwischen dem in dem Kältemittelkreislauf (38) fließenden Kältemittel und dem Prozessmedium vorzunehmen;
    wobei die Wäschewasch- und/oder Wäschetrocknungsvorrichtung gekennzeichnet ist durch
    • einen Speicher, der eine Vielzahl (j) von Datenpaaren speichert, wobei ein erstes Element jedes Datenpaars von einem Stromhöchstwert iMAXj für den Strom eines Elektromotors abhängig ist, und das zweite Element des Paars entsprechend von einem Verdichter-Temperaturhöchstwert TMAXj abhängig ist, der dem Stromhöchstwert iMAXj des ersten Elements zugehörig ist, wobei die Vielzahl von Datenpaaren einen vorher festgelegten Sicherheitsarbeitsraum für den Verdichter begrenzt;
    • einen Temperatursensor und einen Stromsensor, die in der Lage sind, im Wesentlichen zur gleichen Zeit einen Wert, der eine Temperatur des Verdichters anzeigt, beziehungsweise einen Wert zu messen, der eine Stromaufnahme des Verdichter-Elektromotors anzeigt;
    • eine Verarbeitungseinheit (40), die in der Lage ist, ein von dem Temperatursensor ausgesendetes Signal und ein von dem Stromsensor (39) ausgesendetes Signal zu empfangen, die auf den Messwerten beruhen; wobei die Verarbeitungseinheit (40) in der Lage ist, die Signale, die auf dem gemessenen Temperaturwert TM und dem Stromaufnahmewert iM beruhen, mit der Vielzahl von Daten zu vergleichen und die Stromzufuhr zu dem Verdichter zu begrenzen, was Folgendes umfasst: Ausschalten des Verdichter-Elektromotors oder Einstellen einer Drehzahl des Verdichter-Elektromotors, wenn
    ∘ in der Vielzahl ein Datenpaar (TMAXj*, iMAXj*) vorhanden ist, für das | T MAXj * − T M | = min j | T M − T MAXj |
    Figure imgb0020
     und iM ≥iMAXj* oder
    ∘ in der Vielzahl ein Datenpaar (TMAXj*, iMAXj*) vorhanden ist, für das | i MAXj * − i M | = min j | i M − i MAXj |
    Figure imgb0021
     und TM ≥TMAXj*.
  11. Wäschevorrichtung (1) nach Anspruch 10, wobei sich der Temperatursensor an einem an dem Verdichter vorgesehenen Kältemittelauslass oder an einem Teil einer Gehäuseschale des Verdichters (33) befindet.
  12. Wäschevorrichtung (1) nach Anspruch 10 oder 11, die einen Überlastschutz aufweist, wobei die Vielzahl von Daten oder die stetige Kurve eine Kennkurve des Überlastschutzes ist.
  13. Wäschevorrichtung nach einem der Ansprüche 10 bis 12, die einen aktiven Schalter aufweist, der von der Verarbeitungseinheit so angesteuert wird, dass er den Verdichter (33) von der Stromversorgung trennt.
  14. Wäschevorrichtung (1) nach Anspruch 10 oder 11, wobei der Verdichter (33) keinen Überlastschutz aufweist.
  15. Wäschevorrichtung (1) nach einem der Ansprüche 10 bis 14, wobei die Vorrichtung einen weiteren Elektromotor umfasst, der die Behandlungskammer und/oder eine Pumpvorrichtung, die das Prozessmedium fördert, in Drehung versetzt.
  16. Wäschevorrichtung (1) nach einem der Ansprüche 10 bis 15, die einen drehzahlgeregelten Verdichter (33) aufweist.
EP15178405.5A 2015-07-27 2015-07-27 Verfahren zum betrieb einer wärmepumpentrocknungs- und/oder -waschvorrichtung sowie wärmepumpentrocknungs- und/oder -waschvorrichtung Active EP3124678B1 (de)

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AU2016204990A AU2016204990B2 (en) 2015-07-27 2016-07-15 Method of operation of a heat pump drying and/or washing appliance and heat pump drying and/or washing appliance
CN201610597792.4A CN106400430B (zh) 2015-07-27 2016-07-26 热泵式干衣和/或洗衣装置及其操作方法

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AU2016204990B2 (en) 2021-07-29
CN106400430A (zh) 2017-02-15
EP3124678A1 (de) 2017-02-01
AU2016204990A1 (en) 2017-02-16
CN106400430B (zh) 2020-06-12

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