WO2013186114A1 - Sécheur à condensation équipé d'une pompe et procédé pour le faire fonctionner - Google Patents

Sécheur à condensation équipé d'une pompe et procédé pour le faire fonctionner Download PDF

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Publication number
WO2013186114A1
WO2013186114A1 PCT/EP2013/061702 EP2013061702W WO2013186114A1 WO 2013186114 A1 WO2013186114 A1 WO 2013186114A1 EP 2013061702 W EP2013061702 W EP 2013061702W WO 2013186114 A1 WO2013186114 A1 WO 2013186114A1
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WO
WIPO (PCT)
Prior art keywords
condensate
condensation dryer
cleaning
pump
air
Prior art date
Application number
PCT/EP2013/061702
Other languages
German (de)
English (en)
Inventor
Kai Nitschmann
Original Assignee
BSH Bosch und Siemens Hausgeräte GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BSH Bosch und Siemens Hausgeräte GmbH filed Critical BSH Bosch und Siemens Hausgeräte GmbH
Publication of WO2013186114A1 publication Critical patent/WO2013186114A1/fr

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Classifications

    • 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 
    • D06F58/24—Condensing 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
    • 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
    • D06F58/45—Cleaning or disinfection of machine parts, e.g. of heat exchangers or filters
    • 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
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/04—Quantity, e.g. weight or variation of weight
    • 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
    • D06F2103/28—Air properties
    • D06F2103/32—Temperature
    • 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
    • D06F2103/38—Time, e.g. duration
    • 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
    • D06F2103/58—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to condensation, e.g. condensate water level
    • 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
    • D06F2103/70—Number of operational cycles
    • 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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/34—Filtering, e.g. control of lint removal devices
    • 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
    • D06F2105/58—Indications or alarms to the control system or to the user
    • 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
    • D06F2105/58—Indications or alarms to the control system or to the user
    • D06F2105/60—Audible signals
    • 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
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/22—Lint collecting arrangements

Definitions

  • the invention relates to a condensation dryer and a method for its operation. More particularly, the invention relates to a condensation dryer with a drying chamber for laundry items to be dried, a process air duct in which a heater for heating the process air, a heat exchanger for cooling the process air after passing through the drying chamber and a blower for the transport of the process air, a control device, a condensate tray and a pump driven by an electric motor for conveying an aqueous liquid originating from the condensate tray, and a preferred method for its operation.
  • a condensation dryer is a tumble drier whose function is based on the condensation of moisture from damp laundry items evaporated by means of warm air (so-called "process air”) .
  • the process air is passed through a fan via a heater into a drum containing a wet laundry as a drying chamber The hot air absorbs moisture from the laundry items to be dried
  • the moist process air is led into a heat exchanger, which is usually preceded by a lint filter in the heat exchanger (eg air-to-air heat exchanger, heat sink of a heat pump ) the moist process air is cooled, so that the water contained in the moist process air is condensed and initially collected in a condensate pan
  • the condensed water is then usually collected in a suitable condensate tank and the cooled and dried air in general n ("circulating air dryer”) again fed to the heater and then the drum.
  • a condensation dryer thus does not emit exhaust air laden with moisture, which should not be discharged into the interior of a building, like a conventional exhaust air dryer and does not require an exhaust hose for discharging this exhaust air from a building can therefore be in an internal bathroom or a laundry room of a larger residential complex.
  • exhaust air dryer with a separation of condensate in a heat exchanger.
  • the process air entrains lint contained in the laundry items to be dried when passing through the drying chamber. Larger lint can be retained in the lint filter. However, a large part of the finely divided fluff passes through the lint filter and settles in the process air duct. The deposit of fluff is particularly pronounced in the heat exchanger, where condensate is due to the cooling of the moist, warm process air. The separated lint hinder the process air flowing through the heat exchanger and also affect the heat exchange. This can decrease the efficiency of the condensation dryer and increase its susceptibility to failure.
  • the heat exchanger is removable, especially if it is designed as an air-to-air heat exchanger.
  • the heat exchanger can then be removed from the condensation dryer for cleaning and, after a removal of adhering lint, for example by rinsing with water, be reinserted into the dryer.
  • adhering lint for example by rinsing with water
  • this is not possible if a heat sink of a heat pump is used as a heat exchanger, since the components of a heat pump in the condensation dryer are usually firmly connected to each other.
  • condensation dryers have been developed with an internal cleaning capability for the heat exchanger. In order to achieve a sufficient cleaning effect, it is known to direct the collected condensate gushing through the heat exchanger to clean it.
  • DE 199 43 125 A1 discloses a method for cleaning a section of a guide of a process air flow in a domestic laundry dryer, wherein outside of a drying phase, in which produced by means of a blower, the process air flow and is brought into the drying room in contact with the laundry to be dried, in a cleaning phase with the fan off, a portion of the process air guide is at least partially flooded with a liquid for a certain period of time.
  • a measure of the degree of contamination of a section of the process air duct eg a Temperature difference between the incoming and outgoing process air or between the incoming and outgoing cooling air, can be detected and automatically initiated when a threshold value is exceeded, a cleaning phase.
  • DE 37 38 033 A1 describes a device for monitoring the degree of flow of a formed as a heat exchanger condensate separator in a household tumble dryer.
  • a respective temperature sensor for the cooling medium are arranged at the entrance of the cooling channels in the heat exchanger and at the exit from the heat exchanger and connected in a comparison circuit in which the difference of the electrical values equivalent to the measured temperatures is comparable as a difference signal with an electrical reference signal ,
  • DE 37 38 031 A1 relates to a method and an apparatus for removing flows from a formed as a heat exchanger condensate separator of a clothes dryer.
  • a display device having a threshold circuit for the heat exchanger may be used, which functions when a degree of flow is exceeded and the efficiency of the heat exchanger decreases.
  • EP 0 709 516 B1 describes a message requesting device for cleaning a condenser in a tumble dryer, which contains at least one mechanical memory, a nonvolatile electronic memory, means for incrementing the nonvolatile memory and signaling means, wherein the incrementing means does not control the content of the non Volatile memory increment with each drying cycle, as long as the mechanical memory has not stored a withdrawal and re-insertion of the condenser in the dryer.
  • the non-volatile memory is reset to zero each time the capacitor is inserted.
  • the notification means request to clean the capacitor as soon as the content of the non-volatile memory reaches a given value N.
  • DE 10 2008 006 347 A1 describes a condensation dryer with a drying chamber for objects to be dried, a process air duct in which a heater for heating the process air, a heat exchanger for cooling the process air after passing through the drying chamber and a fan for the Transporting the process air is located, a controller and first means for detecting a need for cleaning the heat exchanger.
  • a first means in particular, a clock is present, which determines a total duration t sum of previously performed drying processes and with a predetermined limit duration t
  • WO 2009/095316 A1 and DE 10 2008 006 349 A1 describe a condensation dryer with a process air duct, a heat exchanger and a condensate pan, wherein a level sensor is arranged in the condensate pan in contact with the process air in the process air duct.
  • DE 10 2010 029 892 A1 describes a condensation dryer with a drying chamber for objects to be dried, a process air duct in which a heater for heating the process air, a heat exchanger for cooling the process air after passing through the drying chamber and a blower for the transport of the process air a cleaning device operating with an aqueous liquid, which generates at least one liquid jet, and a control device, wherein the cleaning device changes the direction and / or intensity of the at least one liquid jet during its operation.
  • EP 2 171 151 B1 describes an arrangement for automatic cleaning of air filters in a heat pump fabric drying machine, comprising at least one nozzle for injecting a liquid and at least one air filter unit, wherein the air filter unit and / or the liquid injection nozzle is mounted such that she being able to move relative to a stationary reference frame, the relative movement being effected by at least one associated actuator.
  • a pump is used, for example a bidirectionally operating pump which is driven by a DC motor.
  • the cleaning of a heat exchanger of a condensation dryer and also a previously determined determination of a cleaning requirement are thus associated with a great effort. However, if a timely cleaning of the heat exchanger is omitted, it may lead to a deterioration of the efficiency of the condensation dryer or even to failure up to a failure of the condensation dryer and repair may be required.
  • a cleaning method adaptable to the degree of soiling would be desirable, in particular one in which flushing with an aqueous liquid would be improved.
  • the object of the present invention was to provide a condensation dryer in which cleaning of components of the condensation dryer with an aqueous liquid can be carried out more flexibly and efficiently.
  • the invention is intended to allow lint-contaminated components of the condensation dryer, e.g. a heat exchanger can be cleaned in an improved manner using condensate from a condensate tray of the condensation dryer.
  • condensation dryer (herein also abbreviated to "dryer") having the features of the corresponding independent patent claim and the method of the corresponding independent patent claim Preferred embodiments of the condensation dryer according to the invention and of the method according to the invention are in corresponding dependent claims Preferred embodiments of the method according to the invention correspond to preferred embodiments of the dryer according to the invention and vice versa, although this is not explicitly stated herein.
  • the invention thus relates to a condensation dryer with a drying chamber for laundry items to be dried, a process air duct in which there is a heater for heating the process air, a heat exchanger for cooling the process air after passing through the drying chamber and a blower for the transport of the process air
  • a controller a condensate pan, and a pump driven by an electric motor for conveying an aqueous liquid originating from the condensate pan, wherein the electric motor used to operate the pump is a BLDC motor.
  • a condensate tray is understood herein to mean, in particular, a three-dimensional body which is located below the heat exchanger and which can collect condensate that accumulates in the process air channel during the heat exchange with the moist, warm process air.
  • a condensate container used in embodiments of the invention is generally understood to mean a vessel into which the condensate initially collected in the condensate tray is transported for collection, in particular for intermediate storage, before being used again for cleaning.
  • the pump is arranged in a condensate channel between the condensate tray and a component of the condensation dryer to be cleaned. If the condensate is collected in a condensate tank, the pump is preferably arranged between the condensate tank and the component to be cleaned. It may be advantageous that between the condensate tray and the condensate tank, a further pump for conveying condensate from the condensate tray is arranged.
  • the condensate or a "condensate pan-derived aqueous liquid" which may also be a mixture of condensate with tap water, the term “flushing liquid" is also used.
  • Transport of an aqueous liquid originating from the condensate tray herein means, in particular, transport of the aqueous liquid originating from the condensate tray to a component to be cleaned, which is generally followed by contacting and cleaning the component to be cleaned.
  • the condensate tank may be fixed or removable in the condensation dryer. If the condensate container can be removed, a user of the condensation dryer can easily dispose of the spent, ie with a large amount of lint etc. contaminated, rinsing liquid. Otherwise, an excessively dirty rinse liquid should be pumped out of the condensation dryer by a suitable device. This can be done for example by means of the pump directly or via the condensate tray.
  • the component to be cleaned can be cleaned with an aqueous liquid originating from the condensate tray.
  • a rinsing liquid condensate per se or a mixture of condensate with a condensation dryer from outside the condensation dryer, e.g. be used by an external water supply, supplied aqueous liquid, in particular tap water.
  • the condensate originate directly from the condensate tray or initially stored in a condensate tank.
  • tap water can be mixed as an aqueous liquid directly with the condensate and the mixture can be used as a rinsing liquid for cleaning.
  • a mixture of condensate and tap water can be produced or temporarily stored in the condensate tank before it is used as flushing liquid in one embodiment of the process according to the invention.
  • the condensation dryer is therefore connectable to an external water supply, so that an aqueous liquid from the external water supply, in particular tap water, can be mixed with the condensate.
  • a sensor for the state of purity of the condensate is present in the condensate channel.
  • the proportion of impurities for example fluff
  • an amount of tap water corresponding to this proportion is added to the condensate for dilution before it is used as flushing fluid in the meaning of the invention.
  • is disposed of for the proportion of impurities.
  • At least one heat exchanger is present as a component preferably to be cleaned.
  • the heat exchanger is in particular an air-air heat exchanger or a heat sink, in particular an evaporator, a heat pump.
  • a heat pump is characterized by two heat exchangers, namely a heat sink, in which heat is absorbed, a heat source in which heat is released, and a pumping device, which transfers heat from the heat sink to the heat source, optionally with temperature change.
  • the cooling of the warm, moisture-laden process air takes place essentially in the heat sink of the heat pump, also referred to as evaporator, where the heat transferred is used to evaporate a refrigerant circulating in the pump device designed as a circuit
  • the refrigerant vaporized due to the heating is supplied in the pump device via a compressor of the heat source, which is a condenser for the refrigerant, the heat pump, where due to the liquefaction of the gaseous refrigerant heat is released, which is used to heat the process air before entering the drying chamber, usually a drum, is used.
  • a compressor of the heat source which is a condenser for the refrigerant
  • the heat pump where due to the liquefaction of the gaseous refrigerant heat is released, which is used to heat the process air before entering the drying chamber, usually a drum, is used.
  • the now liquid refrigerant is expanded in a throttle of the pumping device, whereby its internal pressure is reduced, and finally passes back
  • condensation dryer according to the invention is in the process air duct in any case preferably an air-to-air heat exchanger or an evaporator of a heat pump, particularly preferably an evaporator of a heat pump.
  • a BLDC motor used in the condensation dryer according to the invention is generally a brushless DC motor (Brushless DC motor), in which in particular the otherwise conventional mechanical commutator with brushes for current application is replaced by an electronic drive circuit.
  • the rotor is realized with a permanent magnet.
  • the fixed stator usually comprises coils which are actuated offset in time by an electronic circuit in order to create a rotating field which produces a torque at the permanent excited rotor generated.
  • BLDC motors it is possible to make the electronic commutation dependent on the rotor position, the rotor speed and the torque.
  • a sensor-controlled and a sensorless commutation are used to detect the rotor position and speed.
  • PMS motor Another term for the motor generally described herein as a BLDC motor is PMS motor, where "PMS” is an abbreviation for the English term “Permanent Magnet Synchronous” and thus to both the permanent magnet rotor of the motor and the design indicates the motor as a synchronous motor.
  • a BLDC motor as a drive motor for the pump allows a change in the speed in a simple manner and in particular a high speed.
  • a BLDC motor By using a BLDC motor, a very flexible and efficient implementation of the inventive method discussed below is possible.
  • the condensation dryer has means for detecting the cleaning requirement of components to be cleaned. This allows a particularly efficient use of the dryer according to the invention and an efficient implementation of the method described in detail below for its operation.
  • the condensation dryer as a means for detecting the cleaning requirement on a clock, which determines a total duration t sum of previously performed drying processes and with a predetermined limit duration t
  • the type of garments can be taken into account, which can be done for example via an automatic determination of the type of laundry or a setting on the condensation dryer by a user.
  • the condensation dryer as a means for detecting the need for cleaning a counter, the number n of the already determined drying processes and compared with a predetermined limit number riiim.
  • This counter can preferably be reset when cleaning the heat exchanger is performed.
  • the condensation dryer as a means for detecting the need for cleaning in the process air duct having a first temperature sensor and a second temperature sensor, which are arranged on opposite sides of the tau- shear and by comparing a difference ⁇ of the measured temperatures with a predetermined limit for the temperature difference AT
  • Is in the condensation dryer according to the invention as a means for detecting the need for cleaning a clock available, which determines a total duration t sum of previously performed drying processes and with a predetermined limit duration t
  • the methods for detecting a need for cleaning can be used, for example, both for a heat exchanger and for a lint filter as a component to be cleaned.
  • the condensation dryer generally has a nozzle, since the rinsing liquid is generally passed through a suitable nozzle to the component to be cleaned of the condensation dryer.
  • a nozzle can extend over the entire width of a heat exchanger and, for example, a length of 200 mm with a 2 mm wide die gap.
  • the invention also makes it possible in particular to use significantly smaller nozzles, for example with a circular outlet opening with a diameter of a few mm, in particular less than 2 mm. Due to the higher jet pressures possible with the present invention, blockage of even small nozzles can generally be avoided or eliminated quickly.
  • the dryer also has an acoustic and / or visual display device for different states of the dryer.
  • an optical display device is preferably used.
  • the display device can give information about the operation of the dryer, for example, by the output of a text or by lighting different colored light emitting diodes, for example via the course of a method according to the invention and / or the display of a cleaning requirement. If necessary, the need for cleaning can be quantified.
  • the condensation dryer therefore has an acoustic and / or visual display device for indicating a cleaning requirement and / or for indicating the execution of a cleaning process.
  • a fill level sensor is therefore arranged in the condensate tray of the condensation dryer and in embodiments in which a condensate container is used, in the condensate container or in both.
  • the level sensor to be used in embodiments of the invention is not limited.
  • a permanent magnet float is used in conjunction with a reed contact as fill level sensor. In this case, the reed contact in contact with the permanent magnetic float in the condensate tray close a circuit.
  • the pump is only put into operation when in the condensate tray and / or possibly one Condensate tank a predetermined minimum liquid level d m in present.
  • the conveyance of rinsing liquid or condensate can thereby be made dependent on the presence of a sufficient amount in the condensate tray or the condensate container.
  • the water flow in the intake of the pump can be designed appropriately. This is preferably designed such that even with a maximum delivery rate of the pump, the flow of the aqueous liquid during pumping can not break off. This means that a sufficiently large volume of condensate or rinsing liquid is advantageously present in the intake area of the pump.
  • the condensation dryer according to the invention for this embodiment an optical and / or acoustic display means for falling below a predetermined minimum level h min in the condensate pan.
  • the control of the pump may be accomplished by causing an inverter in the BLDC motor to fluctuate in response to a changing motor current and thus to a low liquid level, i. too small an amount of flushing liquid, recognizes.
  • an inverter in the BLDC motor may fluctuate in response to a changing motor current and thus to a low liquid level, i. too small an amount of flushing liquid, recognizes.
  • the operation of the pump i. the delivery mode is set or interrupted for a given period of time.
  • the condensation dryer according to the invention can be configured as an exhaust air dryer or as a circulating air dryer.
  • the process air is circulated in a closed circuit.
  • the process air is fed as so-called supply air from a supply air access to the drum and passed after leaving the drum and passage through the heat exchanger as exhaust air to an exhaust outlet.
  • process air and cooling air or process air and refrigerant of a heat pump are each guided through the corresponding heat exchangers in a crossflow or countercurrent process.
  • the heater in the dryer according to the invention may be, for example, an electric heater or a gas heater.
  • the heating is appropriately regulated, ie its heat output decreases as the degree of drying progresses.
  • the invention also relates to a method for operating a condensation dryer with a drying chamber for objects to be dried, a process air duct in which a heater for heating the process air, a heat exchanger for cooling the process air after passing through the drying chamber and a blower for the transport of the process air located, a control device, a condensate pan, a pump driven by an electric motor for conveying an originating from the condensate pan aqueous fluid in a condensate channel, wherein the electric motor used to operate the pump is a BLDC motor and
  • step (B) the condensate is brought into contact with the component.
  • the rotational speed of the BLDC motor can be set in a wide range in the above-described step (a).
  • the steps (a) and (b) are preferably carried out before or after a drying process has been carried out.
  • a drying process is characterized in particular in that the heating is switched on to heat the process air.
  • the method comprises in a rinsing program a step (a) with several sections (a,) in which the pump is switched off and / or a delivery rate of the pump is different.
  • the method in particular the rinsing program, is preferably carried out with regard to a determined cleaning requirement of components to be cleaned.
  • a step of qualitative or quantitative determination of a cleaning requirement of components of the condensation dryer is provided, as a means for detecting the cleaning requirement, for example, a clock is present, which determines a total duration t sum of previously performed drying processes and with a predetermined limit duration t Nm compares, and / or the condensation dryer as a means for detecting the cleaning requirement comprises an evaluation unit which determines a total amount M of previously dried laundry items and with a predetermined limit total amount M
  • the means for determining the cleaning requirement for the heat exchanger determine a degree of use U, compare this with a predetermined value U
  • im U, the cleaning requirement.
  • in using a clock in each case a period At, when using two temperature sensors, a temperature difference AT and using a certain total amount M of previously dried laundry pieces each weighing.
  • a cleaning requirement or a cleaning time can also be determined by monitoring the temperature of the process air as a function of the duration of a drying process.
  • the occurrence of comparatively high temperatures can be seen as indicative of a lint-laden and therefore compromised in its heat exchange efficiency air-to-air heat exchanger.
  • the cleaning requirement for e.g. the heat exchanger is displayed acoustically and / or visually. Since this makes it possible for a user of the condensation dryer to recognize the need for cleaning, an acoustic and / or optical display of the cleaning requirement, in addition to automatic cleaning, also allows control of the cleaning by the user. If a determination of the cleaning requirement for one or more components of the condensation dryer is provided, these are or are subsequently subjected to the method according to the invention for the qualitative or quantitative determination of the cleaning requirement and are generally cleaned. Preferably, a cleaning of the heat exchanger is performed. The cleaning can be carried out automatically or by a user of the condensation dryer controllable. For this purpose, it is preferably possible to set on the condensation dryer whether a cleaning or a cleaning step should be carried out automatically or manually.
  • the rinsing liquid used in the process according to the invention generally comprises condensate to which more or less large amounts of an aqueous liquid, such as tap water, may be added.
  • an aqueous liquid such as tap water
  • additives such as other solvents (for example alcohols) or surface-active reagents may be added to the rinsing liquid.
  • the cleaning programs are basically not limited, as long as sufficient cleaning of the heat exchanger is achieved. Thus, the cleaning programs can differ in terms of quantity, temperature and flow rate of the washing liquid.
  • an amount of a rinsing liquid required as a function of a predetermined cleaning program is determined, compared with the amount of rinsing liquid present in a storage container, and an undershooting of the required quantity is indicated acoustically and / or visually.
  • a selected drying process is preferably assigned specific rotational speed ranges or rotational speeds of the BLDC motor used to operate the pump.
  • the speed of the BLDC motor used can be varied in a predetermined manner and an efficient cleaning can be achieved via a corresponding variation of the flow rate of the rinsing liquid, generally expressed as volume per (time times line or nozzle cross-section) ,
  • a high flow rate may be selected, which then decreases to eventually increase again. Such variations in flow rate can be repeated.
  • a pulsating operation can be carried out in which the pump is operated according to a high flow speed over a predetermined first period, but in a second period the pump is turned off. Subsequently, the pump is operated again according to a high flow rate for a predetermined third period.
  • contaminants on a component to be cleaned e.g. Fluff
  • water can be supplied from an external water supply or the rinsing liquid can be disposed of.
  • the quality of the aqueous liquid to be used is preferably determined by means of a suitable sensor, e.g. an optical sensor such as a turbidity sensor.
  • the rinsing liquid is passed into the heat exchanger, then collected in a condensate tray and then pumped back into the condensate channel.
  • Such a cycle is traversed more than once, so that, for example, results in a cycle of the rinsing liquid for a predetermined period.
  • the user in the embodiment of the condensation dryer with a removable condensate container can manually dispose of the rinsing liquid by removing and emptying the condensate container.
  • the rinsing liquid can be disposed of automatically, for example via a drain hose from the condensation dryer. It is possible that the flushing liquid is pumped out of the condensate pan directly through a suitable pump and disposed of.
  • the condensate is first collected in a condensate container.
  • the pump driven by a BLDC motor is preferably arranged between the condensate container and the component to be cleaned.
  • the optional mixing of water from an external water supply can be done directly by connecting a water supply line with the condensate channel or by adding or introducing additional water into the condensate tank.
  • the invention has surprising advantages, in particular in the case of a condensation dryer with an internal cleaning option.
  • the use of a BLDC motor allows better, in particular through the generation of higher shear forces
  • the invention also allows the use of a plurality of different nozzles, in particular of nozzles, which differ significantly in the size of their opening (nozzle opening geometries), since due to the possible with the present invention higher flow rate of the rinsing liquid, ie jet prints, obstruction or avoided can be eliminated.
  • the invention has the advantage that in the case of a condensation dryer, without the necessity of opening it, both a need for cleaning of components can be determined and efficient cleaning can be carried out. In a simple and efficient way can be cleaned automatically or by influencing a user, for example, the heat exchanger or the lint filter of the condensation dryer.
  • FIG. 1 shows a vertical section through a first embodiment of a condensation dryer, which is designed as a circulating air dryer with an air-to-air heat exchanger.
  • Figure 2 shows a vertical section through a second embodiment of a condensation dryer, which is also designed as a circulating air dryer with an air-to-air heat exchanger.
  • Fig. 3 shows a vertical section through a third embodiment of a condensation dryer, which is designed as a circulating air dryer with a heat pump and in particular with an evaporator as a heat sink.
  • FIGS. 1 to 3 the long arrows indicate the flow direction of the process air.
  • the dryer 1 shown in FIG. 1 has a drum, which is rotatable about a horizontal axis, as a drying chamber 3, within which drivers 25 are fastened for moving laundry items during a drum rotation.
  • the process air is guided in the process air duct 2 by means of a blower 6 via an electric heater 4 through the drum 3.
  • heated air from the rear ie from the side of the drum 3 opposite the filling opening 22, is directed by the electric heater 4 through the perforated bottom into the drum 3.
  • the heated process air thus passes into the drum 3, where in Fig. 1, not shown wet laundry items moisture is removed.
  • the process air laden with moisture in the process air duct 2 flows through a lint filter 16 within the door 22. Subsequently, the process air flow in the door 22 is deflected downwards and directed to an air-to-air heat exchanger 5. As a result of cooling, the moisture absorbed by the process air from the items of laundry condenses there and is collected in a condensate tray 7.
  • the condensate or aqueous liquid 33 collected in the condensate tray 7 is conveyed to the air-to-air heat exchanger via a condensate channel 23 in which there is a pump 9 driven by a BLDC (Brushless DC) motor 8 5 headed.
  • BLDC Battery-to-air heat exchanger
  • an external water supply 21 is connected via a water supply line 20 to the condensate channel 23.
  • This allows a mixture of condensate with tap water to achieve a desired low impurity level in the flushing liquid 33.
  • a lack of available condensate can be compensated in this way.
  • the used rinsing liquid 33 (condensate used for cleaning, possibly diluted with tap water) can, if necessary due to the contamination, be disposed of via a line not shown to the outside of the device.
  • the condensation dryer 1 has a first temperature sensor 29 in front of the air-air heat exchanger 5 and a second temperature sensor 30 downstream of the air-air heat exchanger 5.
  • the heat exchange proceeds very efficiently, so that the process air cools strongly when passing through the air-to-air heat exchanger 5.
  • the efficiency of the air-to-air heat exchanger 5 decreases.
  • the process air does not cool as much when passing through the air-to-air heat exchanger 5.
  • a decreased temperature difference ⁇ between the first temperature sensor 29 and the second temperature sensor 30 is detected.
  • cooling air flows in a cooling air duct 32 in the air-to-air heat exchanger 5 from a cooling air inlet 26 to a cooling air outlet 31.
  • a cooling-air blower 27 is arranged in the cooling-air duct 32.
  • a counter 37 for the number of drying processes carried out, a clock 11 and an evaluation unit 17 are present as means for determining a cleaning requirement of the air-air heat exchanger 5. These are either part of the control device 10 of the condensation dryer 1 or assigned to it.
  • the air-air heat exchanger 5 is cleaned by means of the condensate 33 possibly mixed with water from the water supply line 20 as rinsing liquid.
  • the rinsing liquid 33 thus comprises condensate which has previously accumulated in the air-air heat exchanger 5 and is pumped from the condensate tray 7 by means of the pump 9 via a condensate channel 23 into the air-air heat exchanger 5.
  • the rinsing liquid 33 is collected in the condensate tray 7 and can be pumped back to the heat exchanger 5 via the condensate channel 23. This cycle can be repeated several times until a desired cleaning is achieved.
  • the drum 3 is mounted in the embodiment shown in Fig. 1 at the rear bottom by means of a pivot bearing and front by means of a bearing plate 35, the drum 3 rests with a brim on a sliding strip 36 on the bearing plate 35 and is held at the front end.
  • the fan 6 and the drum 3 are driven by a drive motor 28.
  • a level sensor 19 is mounted in this.
  • the short thick arrow indicates the flow direction of the cooling air.
  • FIG. 2 shows a vertical section through a condensation dryer 1 according to a second embodiment, which is designed as a circulating air dryer.
  • the cooling of the warm, laden with moisture process air from the drum 3 in the air-to-air heat exchanger 5 by heat exchange with cooling air in a cooling air duct 32.
  • a cooling air blower 27 In the cooling air duct 32 is a cooling air blower 27, which cooling air from a cooling air inlet 26 through the air-to-air heat exchanger 5 through to the cooling air outlet 31 passes.
  • the condensate 33 is pumped with a pump not shown in the condensate channel 23 and then in a condensate tank 34, where the condensate 33 before further use can be cached.
  • the condensate 33 is then pumped by means of the BLDC motor 8 driven pump 9 in the air-to-air heat exchanger 5.
  • the number of revolutions of the BLDC motor 8 can be varied within a wide range, so that the dependent delivery capacity of the pump 9 and thus the achieved flow rate of the condensate 33 are adjusted to a determined degree of contamination of the air-to-air heat exchanger 5 can.
  • Figure 3 shows a vertical section through a condensation dryer 1 according to a third embodiment, which is designed here as a circulating air dryer and as a heat exchanger 15, the evaporator of a heat pump 12, 13,14, 15 has.
  • the short arrows with unfilled arrowhead indicate the flow direction of the refrigerant. Otherwise, the parts shown in Fig. 3 with the same reference numerals have the same meaning as in Figs. 1 and 2.
  • the moist, warm process air leaves the drum 3 via a lint filter 16 and flows in the process air duct 2 to the evaporator 15 of the heat pump, where it is cooled.
  • a refrigerant circulating in the heat pump circuit 12, 13, 14, 15 is vaporized and fed via a compressor 13 to a condenser 12, where the refrigerant passes back into the liquid state with release of heat to the cooled and dehumidified process air flowing in the process air duct.
  • the present in liquid form of refrigerant is passed through a throttle valve 14 in turn to the evaporator 15, whereby the refrigerant circuit is closed.
  • the resulting in the evaporator 15 condensate 33 is collected in a condensate pan 7 and pumped by means of a pump not shown here in a condensate channel 23, first in a condensate tank 34.
  • the condensate tank 34 From the condensate tank 34 is the cached condensate as rinsing liquid 33 by means of a pump 9, the is operated selectively via a BLDC motor 8, passed through the evaporator 15 for the purification of lint, etc. and finally reaches the condensate pan 7.
  • the condensate 33 by means of the pump 9 via the condensate channel 23 back into the condensate tank 34th be pumped. This cycle can be repeated if necessary.
  • a level sensor 19 which is designed here as a reed contact in conjunction with a permanent magnetic float.
  • the fill level sensor 19 makes it possible for the control device 10 to determine whether sufficient condensate is present for carrying out a method according to the invention.
  • the fan 6 and the drum 3 are driven by the motor 30.
  • Display device optical and / or acoustic level sensor

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)

Abstract

L'invention concerne un sécheur à condensation (1) comprenant une chambre de séchage (3) destinée à recevoir des objets à sécher ; un conduit d'air de procédé (2) dans lequel se trouvent un dispositif de chauffage (4) servant à réchauffer l'air de procédé, un échangeur de chaleur (5, 15) servant à refroidir l'air de procédé après son passage dans la chambre de séchage (3) et une soufflante (6) servant à transporter l'air de procédé ; un dispositif de commande (10) ; une cuve à condensat (7) ; et une pompe (9) entraînée par un moteur électrique (8) pour transporter un liquide aqueux (33) brassé hors de la cuve à condensat (7). Le moteur électrique (8) utilisé pour entraîner la pompe (9) est un moteur sans balais à courant continu. L'invention concerne en outre un procédé de fonctionnement de ce sécheur à condensation.
PCT/EP2013/061702 2012-06-12 2013-06-06 Sécheur à condensation équipé d'une pompe et procédé pour le faire fonctionner WO2013186114A1 (fr)

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DE102012209826A DE102012209826A1 (de) 2012-06-12 2012-06-12 Kondensationstrockner mit einer Pumpe sowie Verfahren zu seinem Betrieb
DE102012209826.7 2012-06-12

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DE102014118872A1 (de) * 2014-12-17 2016-06-23 Miele & Cie. Kg Vorrichtung und Verfahren zum Aufrechterhalten einer Funktion einer Wärmepumpeneinrichtung und Wäschebehandlungsgerät
EP3237674B1 (fr) * 2014-12-23 2018-12-12 Electrolux Appliances Aktiebolag Appareil de séchage du linge équipé d'une pompe de vidange de liquide
DE102015206494A1 (de) 2015-04-13 2016-10-13 BSH Hausgeräte GmbH Reinigungsvorrichtung für eine Wäschebehandlungsmaschine
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CN108801041B (zh) * 2017-04-28 2020-07-10 青岛胶南海尔洗衣机有限公司 一种干衣机蒸发器冲洗装置与方法及干衣机
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