EP0467188B1 - Clothes dryer with heat pump - Google Patents

Clothes dryer with heat pump Download PDF

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Publication number
EP0467188B1
EP0467188B1 EP91111341A EP91111341A EP0467188B1 EP 0467188 B1 EP0467188 B1 EP 0467188B1 EP 91111341 A EP91111341 A EP 91111341A EP 91111341 A EP91111341 A EP 91111341A EP 0467188 B1 EP0467188 B1 EP 0467188B1
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EP
European Patent Office
Prior art keywords
air
opening
laundry
process air
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91111341A
Other languages
German (de)
French (fr)
Other versions
EP0467188A1 (en
Inventor
Uwe Zelt
Arthur Rodecker
Peter Dipl.-Ing. Grunske
Günter Dipl.-Ing. Wentzlaff
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KKW KULMBACHER KLIMAGERAETE-WERK GmbH
BSH Hausgeraete GmbH
Original Assignee
KKW KULMBACHER KLIMAGERAETE-WERK GmbH
Kkw Kulmbacher Klimagerate-Werk GmbH
KULMBACHER KLIMAGERAETE
BSH Bosch und Siemens Hausgeraete GmbH
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Application filed by KKW KULMBACHER KLIMAGERAETE-WERK GmbH, Kkw Kulmbacher Klimagerate-Werk GmbH, KULMBACHER KLIMAGERAETE, BSH Bosch und Siemens Hausgeraete GmbH filed Critical KKW KULMBACHER KLIMAGERAETE-WERK GmbH
Publication of EP0467188A1 publication Critical patent/EP0467188A1/en
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Publication of EP0467188B1 publication Critical patent/EP0467188B1/en
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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 
    • D06F58/206—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
    • D06F2103/28—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
    • D06F2103/28—Air properties
    • D06F2103/36—Flow or velocity
    • 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
    • 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
    • D06F2105/16—Air properties
    • D06F2105/24—Flow or velocity
    • 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
    • D06F2105/32—Air flow control means
    • 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
    • D06F58/36—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F58/38—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry of drying, e.g. to achieve the target humidity
    • D06F58/40—Control of the initial heating of the drying chamber to its operating temperature

Definitions

  • the invention relates to a tumble dryer with a for heating the process air, which by means of an electric motor-driven fan in a closed Process air duct is led through a laundry drying room, and one for failure the moisture entrained in the process air from the laundry drying room Heat pump circuit consisting of a condenser, evaporator, compressor and throttle and also with adjustable openings for supply air and extract air in the process air duct.
  • Such a tumble dryer is known from German Offenlegungsschrift 34 07 439.
  • the compressor i.e. So the heat pump circuit, regulated in its performance.
  • air dampers are provided in the process air duct, through which overheating occurs Ambient air is supplied and hot air is removed. Ambient air is thereby proposed in the flow direction of the process air upstream of the evaporator. This leads to a reduction in the performance of the heat pump circuit because of the evaporator is now charged with cooler air, therefore not as much refrigerant can evaporate per unit of time as in the higher temperature level.
  • the invention has for its object a heat pump clothes dryer the type mentioned at the outset, avoiding additional effort as much as possible, that the drying process can be carried out economically and at short notice.
  • this object is achieved by a tumble dryer as described in the introduction Type solved in which the exhaust air opening between the condenser and the Laundry drying room and the supply air opening between the evaporator and the condenser is arranged and one for controlling the air temperature in the process air duct the setting of at least the exhaust opening provided by a closure device Control device of the dryer is permeable and imperviously controllable.
  • the temperature level can be easily achieved by the measure according to the invention in the process air duct can be kept at a desired height without the performance of the heat pump cycle. Since the temperature difference on Evaporator remains almost the same, will also be the most effective
  • the temperature level is only reduced on the condenser, its performance remains the same, however, because it differs from the inventive unaffected evaporator performance is dependent.
  • the Performance of the heat pump is designed so that the Desired temperature level when the dryer is fully loaded can be kept with damp laundry. Thereby there is no further regulation. That keeps the cost price of the heat pump dryer in an acceptable Frame.
  • the exhaust air opening or the extract air and supply air openings with controllable Locking devices are lockable, these locking devices can during the start-up phase of dry operation until a desired operating temperature is reached the process air or the compressor kept closed become. This allows the start-up phase to go through faster and their end to be defined more precisely.
  • a control unit As Criterion for switching the locking devices can Control device a temperature measuring device, e.g. a temperature sensor, serve in the process air duct, which preferably in Process air duct between the condenser and the laundry drying room but in the direction of flow in front of the exhaust air opening is arranged. Instead, however, the Temperature of the compressor are monitored with the end the start-up phase rises sharply.
  • the closure devices can also each directly connected to a temperature sensor, Reaching the desired temperature in the sense of opening acts on the associated closure device.
  • a temperature sensor Reaching the desired temperature in the sense of opening acts on the associated closure device.
  • the tumble dryer contains a laundry drum as a laundry drying room 1 by a hot air flow accordingly the arrows flow through.
  • the warm air is in one closed process air duct led, the one duct part 2 for the dry warm air, a duct part 3 for the moist, slightly cooler air and a duct part 4 for the cool dry air between an evaporator 5 and one Condenser 6 contains.
  • an electric motor driven blower 7 switched, the process air keeps in circulation.
  • the evaporator 5 and the Condenser 6 of a heat pump circuit arranged in such a way that the process air is in intensive contact with the Heat exchanger surfaces of the evaporator and the condenser can come.
  • the heat pump circuit also contains one Compressor 8 and a throttle valve 9.
  • Below the evaporator 5 is a drip tray 1 for aqueous condensate 11 arranged, which is from the process air on the cool heat exchanger surfaces of the evaporator 5 precipitates.
  • the process air also has good contact with the Heat exchanger surfaces and takes this during the liquefaction process released thermal energy and most of it the compressor energy and carries it into the laundry drum 1. There it serves to heat up the wet laundry and Evaporation or evaporation of those present in the laundry Humidity. This becomes in turn through the channel part 3 Evaporator 5 performed and condenses there with simultaneous Cooling of the process air.
  • the process air gradually heats up and therefore increases Moisture in the drum 1, which they over the Channel part 3 transported to the evaporator 5 and with delivery their heat of vaporization to the evaporator 5 and the therein located coolant condenses.
  • the one contained in it Thermal energy is also via the heat pump circuit fed back to the process air.
  • the system is dimensioned so that it is steady Condition within one for the duration of the start-up phase considered acceptable time is reached when a maximum load of laundry drum 1 with damp laundry a certain level of moisture (e.g. 75% residual moisture) is present. In many cases, however, this loading is likely cannot be achieved, which is why the start-up phase in these Cases are correspondingly shorter.
  • a maximum load of laundry drum 1 with damp laundry a certain level of moisture e.g. 75% residual moisture
  • the heat pump circuit without derating continue to operate, in channel part 2 between the condenser 6 and the laundry drum 1 but the flap 13 of the Exhaust air opening 12 carefully open, so that part here the heated air can escape.
  • the amount of air flowing through the exhaust air opening 12 escapes, but must be replaced again become.
  • a supply air opening 14 is provided, which is connected to the channel part 4 between the evaporator 5 and the condenser 6 is connected.
  • the comparatively cool Air removed from around the dryer contributes here Lowering the temperature of the process air so that without influencing the performance of the heat pump circuit the temperature level can be held.
  • a flap can also be used here 15 flowing to the supply air opening 14 of the careful metering Serve fresh air.
  • the flaps 13 and 15 can by a control unit 16 of the Tumble dryer operated.
  • the control unit can the actuation of the flaps 13 and 15 only from the time Make the progress of the drying process dependent. in the In the sense of a regulation of the drying process and in it reaching the temperature of the process air, however, it is more advantageous the control of the flaps 13 and 15 from the in Flow direction behind the condenser 6 reached temperature to make the process air dependent. This is what a Temperature sensor 17, which is introduced into the flow of process air is. It is connected to a signal generation circuit 18 which in turn the control unit 16 the processable Temperature signal feeds.
  • the start-up phase in the form of a Regulation can be ended by increasing the temperature the process air at the temperature sensor 17 and its waveform circuit 18 emits a signal which is in the control unit 16 is evaluated and processed. It puts this signal into one certain opening width of the flaps 13 and 15 um.
  • the opening widths the flaps 13 and 15 can of course in a certain relationship to the difference in the target temperature from the actual temperature measured by the temperature sensor 17 be dependent in channel part 2. In this way you can also the temperature during the further drying process regulate the process air in duct part 2, even if at advanced drying no longer as much heat energy by evaporation of laundry moisture from the process air is taken as at the beginning of the steady state.
  • the measuring and control device 16 to 18 for the flaps 13 and 15 can also be done in a simpler manner, but without intervention can be achieved with time dependency in that the Flaps 13 and / or 15 even equipped with temperature sensors are. This can be done, for example, by spring-loaded Lids reach the openings when cold seal, but coupled directly with temperature load cells are in the flow area of the medium to be measured lie.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Drying Of Solid Materials (AREA)

Description

Die Erfindung geht aus von einem Wäschetrockner mit einem zum Heizen der Prozeßluft, die mittels eines elektromotorisch angetriebenen Gebläses in einem geschlossenen Prozeßluftkanal durch einen Wäschetrockenraum geführt wird, und einem zum Ausfällen der in der Prozeßluft aus dem Wäschetrockenraum mitgeführten Feuchtigkeit eingerichteten Wärmepumpenkreis aus Verflüssiger, Verdampfer, Kompressor und Drossel sowie ferner mit einstellbaren Öffnungen für Zuluft und Abluft im Prozeßluftkanal.The invention relates to a tumble dryer with a for heating the process air, which by means of an electric motor-driven fan in a closed Process air duct is led through a laundry drying room, and one for failure the moisture entrained in the process air from the laundry drying room Heat pump circuit consisting of a condenser, evaporator, compressor and throttle and also with adjustable openings for supply air and extract air in the process air duct.

Ein derartiger Wäschetrockner ist aus der deutschen Offenlegungsschrift 34 07 439 bekannt. Zur Einhaltung der Temperatur der Prozeßluft wird beim bekannten Wäschetrockner der Kompressor, d.h. also der Wärmepumpenkreis, in seiner Leistung geregelt. Zusätzlich sind im Prozeßluftkanal Luftklappen vorgesehen, durch welche bei Überhitzung Umgebungsluft zugeführt und heiße Luft abgeführt wird. Umgebungsluft wird dabei vorschlagsgemäß in Strömungsrichtung der Prozeßluft vor dem Verdampfer zugeführt. Dies führt zu einer Leistungsminderung des Wärmepumpenkreises, weil der Verdampfer nunmehr mit kühlerer Luft beaufschlagt wird, daher also nicht mehr so viel Kältemittel pro Zeiteinheit verdampfen kann wie im höheren Temperaturniveau. Außerdem wird natürlich auch die Temperaturdifferenz zwischen der gemischten Prozeß-/Umgebungsluft und dem Verdampfer geringer, was zur Herabsetzung der Entfeuchtungsrate in der Prozeßluft führt. Ferner ist die Leistungsregelung des Kompressors technisch nicht gerade einfach zu bewerkstelligen und nicht ganz unproblematisch. Die an sich auf Energieeinsparung gegenüber koventionell beheizten Wäschetrocknern abzielenden Vorschläge aus dem Stand der Technik verteuern also den Wäschetrockner ganz erheblich und machen den gesamten Trocknungsprozeß wieder unwirtschaftlicher und langwieriger. Such a tumble dryer is known from German Offenlegungsschrift 34 07 439. To maintain the temperature of the process air in the known tumble dryer the compressor, i.e. So the heat pump circuit, regulated in its performance. In addition, air dampers are provided in the process air duct, through which overheating occurs Ambient air is supplied and hot air is removed. Ambient air is thereby proposed in the flow direction of the process air upstream of the evaporator. This leads to a reduction in the performance of the heat pump circuit because of the evaporator is now charged with cooler air, therefore not as much refrigerant can evaporate per unit of time as in the higher temperature level. Besides, of course also the temperature difference between the mixed process / ambient air and the evaporator less, which leads to a reduction in the dehumidification rate in the process air leads. Furthermore, the capacity control of the compressor is technically not straight easy to do and not unproblematic. The in itself on energy saving compared to conventionally heated tumble dryers from the prior art thus make the tumble dryer very expensive and expensive the entire drying process again uneconomical and lengthy.

Der Erfindung liegt die Aufgabe zugrunde, einen Wärmepumpen-Wäschetrockner der eingangs genannten Art unter möglichster Vermeidung von Zusatzaufwand so auszubilden, daß der Trocknungsprozeß wirtschaftlich und kurzfristig durchgeführt werden kann.The invention has for its object a heat pump clothes dryer the type mentioned at the outset, avoiding additional effort as much as possible, that the drying process can be carried out economically and at short notice.

Erfindungsgemäß wird diese Aufgabe durch einen Wäschetrockner der eingangs beschriebenen Art gelöst, bei dem die Abluftöffnung zwischen dem Verflüssiger und dem Wäschetrockenraum und die Zuluftöffnung zwischen dem Verdampfer und dem Verflüssiger angeordnet ist und zur Steuerung der Lufttemperatur im Prozeßluftkanal eine für die Einstellung mindestens der Abluftöffnung vorgesehene Verschlußeinrichtung von einem Steuergerät des Wäschetrockners durchlässig und undurchlässig steuerbar ist.According to the invention, this object is achieved by a tumble dryer as described in the introduction Type solved in which the exhaust air opening between the condenser and the Laundry drying room and the supply air opening between the evaporator and the condenser is arranged and one for controlling the air temperature in the process air duct the setting of at least the exhaust opening provided by a closure device Control device of the dryer is permeable and imperviously controllable.

Durch die erfindungsgemäße Maßnahme kann auf einfache Weise das Temperaturniveau im Prozeßluftkanal in einer gewünschten Höhe gehalten werden, ohne die Leistung des Wärmepumpen-Kreislaufes zu vermindern. Da die Temperaturdifferenz am Verdampfer nahezu gleich bleibt, wird auch die wirksame The temperature level can be easily achieved by the measure according to the invention in the process air duct can be kept at a desired height without the performance of the heat pump cycle. Since the temperature difference on Evaporator remains almost the same, will also be the most effective

Entfeuchtung der Prozeßluft erhalten. Das Temperaturniveau wird lediglich am Verflüssiger gesenkt, seine Leistung bleibt aber gleich, weil sie von der erfindungsgemäßen, nicht beeinflußten Verdampfer-Leistung abhängig ist. Die Leistungsfähigkeit der Wärmepumpe wird so ausgelegt, daß das gewünschte Temperaturniveau bei voller Beladung des Wäschetrockners mit feuchter Wäsche gehalten werden kann. Dadurch fällt weiterer Regelungsaufwand weg. Das hält den Gestehungspreis des Wärmepumpen-Wäschetrockners in einem vertretbaren Rahmen.Get dehumidification of the process air. The temperature level is only reduced on the condenser, its performance remains the same, however, because it differs from the inventive unaffected evaporator performance is dependent. The Performance of the heat pump is designed so that the Desired temperature level when the dryer is fully loaded can be kept with damp laundry. Thereby there is no further regulation. That keeps the cost price of the heat pump dryer in an acceptable Frame.

Wenn in einer Weiterbildung der Erfindung die Abluftöffnung oder die Abluft- und die Zuluftöffnungen mit steuerbaren Verschlußeinrichtungen verschließbar sind, können diese Verschlußeinrichtungen während der Anlaufphase des Trockenbetriebes bis zum Erreichen einer gewünschten Betriebstemperatur der Prozeßluft bzw. des Kompressors geschlossen gehalten werden. Damit kann die Anlaufphase schneller durchfahren und ihr Ende genauer definiert werden. Am besten eignet sich zur Steuerung der Verschlußeinrichtungen ein Steuergerät. Als Kriterium zum Schalten der Verschlußeinrichtungen kann dem Steuergerät eine Temperaturmeßeinrichtung, z.B. ein Temperatursensor, im Prozeßluftkanal dienen, die vorzugsweise im Prozeßluftkanal zwischen dem Verflüssiger und dem Wäschetrockenraum aber in Strömungsrichtung vor der Abluftöffnung angeordnet ist. Statt dessen kann aber auch entsprechend die Temperatur des Kompressors überwacht werden, die mit dem Ende der Anlaufphase stark ansteigt.If in a development of the invention, the exhaust air opening or the extract air and supply air openings with controllable Locking devices are lockable, these locking devices can during the start-up phase of dry operation until a desired operating temperature is reached the process air or the compressor kept closed become. This allows the start-up phase to go through faster and their end to be defined more precisely. Best suited for Control of the locking devices a control unit. As Criterion for switching the locking devices can Control device a temperature measuring device, e.g. a temperature sensor, serve in the process air duct, which preferably in Process air duct between the condenser and the laundry drying room but in the direction of flow in front of the exhaust air opening is arranged. Instead, however, the Temperature of the compressor are monitored with the end the start-up phase rises sharply.

Andererseits können auch die Verschlußeinrichtungen mit je einem Temperatursensor direkt verbunden sein, der beim Erreichen der gewünschten Temperatur im Sinne der Öffnung auf die zugeordnete Verschlußeinrichtung einwirkt. Hierdurch sind zwar andere Steuerkriterien als die Temperatur für die Verschlußeinrichtungen ausgeschlossen; jedoch bildet diese Maßnahme eine der einfachsten und billigstens Möglichkeiten zur Steuerung der Anlaufphase.On the other hand, the closure devices can also each directly connected to a temperature sensor, Reaching the desired temperature in the sense of opening acts on the associated closure device. Hereby are different control criteria than the temperature for the Locking devices excluded; however this forms Measure one of the easiest and cheapest ways to control the start-up phase.

Anhand eines in der Zeichnung schematisch dargestellten Blockschaltbildes eines Wärmepumpen-Wäschetrockners ist die Erfindung nachstehend erläutert.Using a schematically shown in the drawing The block diagram of a heat pump dryer is the Invention explained below.

Der Wäschetrockner enthält als Wäschetrockraum eine Wäschetrommel 1, die von einem Warmluftstrom entsprechend den Pfeilen durchströmt wird. Die Warmluft ist in einem geschlossenen Prozeßluftkanal geführt, der einen Kanalteil 2 für die trockene warme Luft, einen Kanalteil 3 für die feuchte, etwas kühlere Luft und einen Kanalteil 4 für die kühle trockene Luft zwischen einem Verdampfer 5 und einem Verflüssiger 6 enthält. Im Zuge des Kanalteils 2 zwischen dem Verflüssiger 6 und der Wäschetrommel 1 ist ein elektromotorisch angetriebenes Gebläse 7 geschaltet, das die Prozeßluft im Umlauf hält.The tumble dryer contains a laundry drum as a laundry drying room 1 by a hot air flow accordingly the arrows flow through. The warm air is in one closed process air duct led, the one duct part 2 for the dry warm air, a duct part 3 for the moist, slightly cooler air and a duct part 4 for the cool dry air between an evaporator 5 and one Condenser 6 contains. In the course of the channel part 2 between the condenser 6 and the laundry drum 1 is an electric motor driven blower 7 switched, the process air keeps in circulation.

Im Zuge des Prozeßluftkanals sind der Verdampfer 5 und der Verflüssiger 6 eines Wärmepumpenkreises derart angeordnet, daß die Prozeßluft jeweils in intensiven Kontakt mit den Wärmetauscherflächen des Verdampfers und des Verflüssigers kommen kann. Der Wärmepumpenkreislauf enthält ferner einen Kompressor 8 und ein Drosselventil 9. Unterhalb des Verdampfers 5 ist eine Auffangschale 1 für wässriges Kondensat 11 angeordnet, das sich aus der Prozeßluft an den kühlen Wärmetauscherflächen des Verdampfers 5 niederschlägt. Im Verflüssiger 6 hat die Prozeßluft ebenfalls guten Kontakt zu den Wärmetauscherflächen und nimmt hierbei die beim Verflüssigungsvorgang frei werdende Wärmeenergie und den größten Teil der Kompressorenergie auf und trägt sie in die Wäschetrommel 1. Dort dient sie zum Aufheizen der feuchten Wäsche und zum Verdunsten bzw. Verdampfen der in der Wäsche vorhandenen Feuchtigkeit. Diese wird durch den Kanalteil 3 wiederum zum Verdampfer 5 geführt und kondensiert dort mit gleichzeitiger Abkühlung der Prozeßluft.In the course of the process air duct, the evaporator 5 and the Condenser 6 of a heat pump circuit arranged in such a way that the process air is in intensive contact with the Heat exchanger surfaces of the evaporator and the condenser can come. The heat pump circuit also contains one Compressor 8 and a throttle valve 9. Below the evaporator 5 is a drip tray 1 for aqueous condensate 11 arranged, which is from the process air on the cool heat exchanger surfaces of the evaporator 5 precipitates. In the condenser 6, the process air also has good contact with the Heat exchanger surfaces and takes this during the liquefaction process released thermal energy and most of it the compressor energy and carries it into the laundry drum 1. There it serves to heat up the wet laundry and Evaporation or evaporation of those present in the laundry Humidity. This becomes in turn through the channel part 3 Evaporator 5 performed and condenses there with simultaneous Cooling of the process air.

Zwischen dem Verflüssiger 6 und der Wäschetrommel 1 ist an den Kanalteil 2 eine Abluftöffnung 12 angeschlossen, die im kühlen Zustand der Anlage von einer Klappe 13 verschlossen ist. Ferner ist zwischen dem Verdampfer 5 und dem Verflüssiger 6 an den Kanalteil 4 eine Zuluftöffnung 14 angeschlossen. Sie kann im kalten Zustand der Anlage von einer Klappe 15 verschlossen sein. Da ein Entweichen von Prozeßluft aus der Abluftöffnung automatisch zum Nachsaugen von Frischluft durch die Zuluftöffnung führen würde, kann auch auf eine Verschlußvorrichtung an der Zuluftöffnung 14 verzichtet werden. Wenn im folgenden beim Ausführungsbeispiel die Klappe 15 gleichsinnig mit der Klappe 13 gesteuert wird, kann auch auf diese Klappe 15 verzichtet werden. Sollte jedoch darüber hinaus eine hier nicht weiter beschriebene Funktion mit der Klappe 15 verbunden sein, dann wäre sie selbstverständlich unverzichtbar.Between the condenser 6 and the laundry drum 1 is on the duct part 2 is connected to an exhaust opening 12, which in cool state of the system closed by a flap 13 is. There is also between the evaporator 5 and the condenser 6 an inlet air opening 14 is connected to the duct part 4. In the cold state of the system, it can be opened from one flap 15 be closed. Because process air escapes the exhaust air opening automatically for sucking in fresh air through the supply air opening can also lead to a Closure device on the supply air opening 14 can be dispensed with. If in the following the flap in the embodiment 15 is controlled in the same direction with the flap 13 can also this flap 15 can be dispensed with. However, it should also a function not described here with the Flap 15 would be connected, then it would be a matter of course indispensable.

Nach dem Inbetriebsetzen des Wäschetrockners aus dem kalten Zustand befindet sich die Anlage in der Anlaufphase. Sie ist dadurch gekennzeichnet, daß die aus der Wäschetrommel 1 entnommene Prozeßluft am Verdampfer 5 abgekühlt und zur Verdampfung der im Wärmepumpenkreis befindlichen Kühlflüssigkeit führt. Die gasförmige Kühlflüssigkeit wird vom Kompressor 8 zum Verflüssiger 6 geleitet, geht dort wieder in den flüssigen Zustand über und gibt daher ihre Verdampfungswärme über die Wärmetauscherflächen wieder an die Prozeßluft ab. Bei einem direkt angetriebenen Gebläse 7 liegt im Prozeßluftkreis auch der Motor M des Gebläses 7, der seine Wärmeenergie ebenfalls an die Prozeßluft abgibt.After starting up the dryer from the cold The system is in the start-up phase. she is characterized in that the washing drum 1 Process air withdrawn from the evaporator 5 is cooled and evaporated the coolant in the heat pump circuit leads. The gaseous coolant is released by the compressor 8 passed to the condenser 6, there goes back into the liquid state and therefore gives their heat of vaporization back to the process air via the heat exchanger surfaces. With a directly driven blower 7 is in the process air circuit also the motor M of the blower 7, which uses its thermal energy also gives off to the process air.

Allmählich erwärmt sich die Prozeßluft und nimmt daher Feuchtigkeit in der Wäschetrommel 1 auf, die sie über den Kanalteil 3 zum Verdampfer 5 transportiert und unter Abgabe ihrer Verdampfungswärme an den Verdampfer 5 und die darin befindliche Kühlflüssigkeit kondensiert. Die in ihr enthaltene Wärmeenergie wird über den Wärmepumpenkreis ebenfalls wieder der Prozeßluft zugeführt. Gegen Ende der Anlaufphase erreicht die Temperatur der Prozeßluft die gewünschte Betriebstemperatur. Diese Temperatur reicht bei geöffneter Klappe 13 zur ständigen Aufrechterhaltung des Wärmetauschund Entfeuchtungsprozesses im eingeschwungenen Zustand aus.The process air gradually heats up and therefore increases Moisture in the drum 1, which they over the Channel part 3 transported to the evaporator 5 and with delivery their heat of vaporization to the evaporator 5 and the therein located coolant condenses. The one contained in it Thermal energy is also via the heat pump circuit fed back to the process air. Towards the end of the start-up phase the temperature of the process air reaches the desired one Operating temperatur. This temperature is sufficient when open Flap 13 for constant maintenance of the heat exchange and Dehumidification process in the steady state.

Die Anlage ist so dimensioniert, daß dieser eingeschwungene Zustand innerhalb einer für die Dauer der Anlaufphase noch als vertretbar angesehenen Zeit erreicht wird, wenn eine maximale Beladung der Wäschetrommel 1 mit feuchter Wäsche eines bestimmten Feuchtigkeitsgrades (z.B. 75 % Restfeuchte) vorliegt. In vielen Fällen dürfte diese Beladung jedoch nicht erreicht werden, weshalb die Anlaufphase in diesen Fällen entsprechend kürzer ausfällt.The system is dimensioned so that it is steady Condition within one for the duration of the start-up phase considered acceptable time is reached when a maximum load of laundry drum 1 with damp laundry a certain level of moisture (e.g. 75% residual moisture) is present. In many cases, however, this loading is likely cannot be achieved, which is why the start-up phase in these Cases are correspondingly shorter.

Damit die Temperatur im Prozeßluftkanal nicht über den vorgenannten gewünschten Wert hinausgeht, ist gemäß der Erfindung vorgesehen, den Wärmepumpenkreis ohne Leistungsminderung weiter zu betreiben, im Kanalteil 2 zwischen dem Verflüssiger 6 und der Wäschetrommel 1 aber die Klappe 13 der Abluftöffnung 12 vorsichtig zu öffnen, so daß hier ein Teil der erhitzten Luft entweichen kann. Die Luftmenge, die durch die Abluftöffnung 12 entweicht, muß jedoch wieder ersetzt werden. Hierzu ist eine Zuluftöffnung 14 vorgesehen, die an den Kanalteil 4 zwischen dem Verdampfer 5 und dem Verflüssiger 6 angeschlossen ist. Die aus der vergleichsweise kühlen Umgebung des Wäschetrockners entnommene Luft trägt hier zur Senkung der Temperatur der Prozeßluft bei, so daß ohne Beeinflussung der Leistung des Wärmepumpenkreises das Temperaturniveau gehalten werden kann. Auch hierbei kann eine Klappe 15 an der Zuluftöffnung 14 der vorsichtigen Dosierung zufließender Frischluft dienen.So that the temperature in the process air duct does not exceed the aforementioned goes beyond the desired value is according to the invention provided the heat pump circuit without derating continue to operate, in channel part 2 between the condenser 6 and the laundry drum 1 but the flap 13 of the Exhaust air opening 12 carefully open, so that part here the heated air can escape. The amount of air flowing through the exhaust air opening 12 escapes, but must be replaced again become. For this purpose, a supply air opening 14 is provided, which is connected to the channel part 4 between the evaporator 5 and the condenser 6 is connected. The comparatively cool Air removed from around the dryer contributes here Lowering the temperature of the process air so that without influencing the performance of the heat pump circuit the temperature level can be held. A flap can also be used here 15 flowing to the supply air opening 14 of the careful metering Serve fresh air.

Die Klappen 13 und 15 können von einem Steuergerät 16 des Wäschetrockners betätigt werden. Dabei kann das Steuergerät die Betätigung der Klappen 13 und 15 lediglich vom zeitlichen Fortschritt des Trockenprozesses abhängig machen. Im Sinne einer Regelung des Trockenprozesses und der darin zu erreichenden Temperatur der Prozeßluft ist es jedoch vorteilhafter, die Steuerung der Klappen 13 und 15 von der in Strömungsrichtung hinter dem Verflüssiger 6 erreichten Temperatur der Prozeßluft abhängig zu machen. Hierzu dient ein Temperatursensor 17, der in den Strom der Prozeßluft eingeführt ist. Er ist an eine Signalbildungsschaltung 18 angeschlossen, die ihrerseits dem Steuergerät 16 das verarbeitbare Temperatursignal zuführt.The flaps 13 and 15 can by a control unit 16 of the Tumble dryer operated. The control unit can the actuation of the flaps 13 and 15 only from the time Make the progress of the drying process dependent. in the In the sense of a regulation of the drying process and in it reaching the temperature of the process air, however, it is more advantageous the control of the flaps 13 and 15 from the in Flow direction behind the condenser 6 reached temperature to make the process air dependent. This is what a Temperature sensor 17, which is introduced into the flow of process air is. It is connected to a signal generation circuit 18 which in turn the control unit 16 the processable Temperature signal feeds.

Auf diese Weise kann einerseits die Anlaufphase in Form einer Regelung beendet werden, indem die angestiegene Temperatur der Prozeßluft am Temperatursensor 17 und seiner Signalformerschaltung 18 ein Signal abgibt, das im Steuergerät 16 bewertet und verarbeitet wird. Es setzt dieses Signal in eine bestimmte Öffnungweite der Klappen 13 und 15 um. Die Öffnungsweiten der Klappen 13 und 15 können selbstverständlich in einer bestimmten Beziehung zur Differenz der Solltemperatur von der vom Temperatursensor 17 gemessenen Isttemperatur im Kanalteil 2 abhängig sein. Auf diese Weise läßt sich auch während des weiterführenden Trocknungsprozesses die Temperatur der Prozeßluft im Kanalteil 2 regeln, auch wenn bei fortgeschrittener Trocknung nicht mehr so viel Wärmeenergie durch Verdunstung von Wäschefeuchtigkeit aus der Prozeßluft entnommen wird wie zu Beginn des eingeschwungenen Zustands.In this way, the start-up phase in the form of a Regulation can be ended by increasing the temperature the process air at the temperature sensor 17 and its waveform circuit 18 emits a signal which is in the control unit 16 is evaluated and processed. It puts this signal into one certain opening width of the flaps 13 and 15 um. The opening widths the flaps 13 and 15 can of course in a certain relationship to the difference in the target temperature from the actual temperature measured by the temperature sensor 17 be dependent in channel part 2. In this way you can also the temperature during the further drying process regulate the process air in duct part 2, even if at advanced drying no longer as much heat energy by evaporation of laundry moisture from the process air is taken as at the beginning of the steady state.

Die Meß- und Regeleinrichtung 16 bis 18 für die Klappen 13 und 15 kann auch auf einfachere Weise, jedoch ohne Eingriff mit zeitlicher Abhängigkeit dadurch erreicht werden, daß die Klappen 13 und/oder 15 selbst mit Temperatursensoren ausgestattet sind. Dies läßt sich beispielsweise durch federbelastete Deckel erreichen, die im kalten Zustand öffnungen verschließen, aber mit Temperaturmeßdosen direkt gekoppelt sind, die im Strömungsbereich des zu messenden Mediums liegen.The measuring and control device 16 to 18 for the flaps 13 and 15 can also be done in a simpler manner, but without intervention can be achieved with time dependency in that the Flaps 13 and / or 15 even equipped with temperature sensors are. This can be done, for example, by spring-loaded Lids reach the openings when cold seal, but coupled directly with temperature load cells are in the flow area of the medium to be measured lie.

Claims (8)

  1. Laundry drier with a heat pump circuit for heating of the process air guided by means of an electric-motor-driven fan (7) in a closed process air channel (2, 3, 4), and a heat pump circuit which is equipped for precipitation of the moisture contained in the process air from the laundry drying chamber and which consists of a condensor (6), evaporator (5), compressor (8) and throttle (9), as well as in addition with a settable opening (12) for exhaust air and an opening (14) for feed air in the process channel (2, 3, 4), in which the exhaust air opening (12) is arranged between the condensor (6) and the laundry drying chamber (1) and the feed air opening (14) between the evaporator (5) and the condensor (6), and a closure device (13) provided for the setting of at least the exhaust air opening (12) is controllable by a control apparatus (16) of the laundry drier to permit throughflow and to prevent throughflow for control of the air temperature in the process air channel.
  2. Laundry drier according to claim 1, characterised in that the feed air opening and exhaust air opening (14 and 12) are each closable by a respective controllable closure device (15 or 13).
  3. Laundry drier according to claim 2, characterised in that the closure devices (13 and 15) are closed during the start phase of the drying operation until attainment of a desired operating temperature of the process air.
  4. Laundry drier according to claim 2, characterised in that the closure devices (13 and 15) are closed during the start phase of the drying operation until attainment of a desired operating temperature of the compressor (8).
  5. Laundry drier according to one of claims 2 to 4, characterised in that at least one of the closure devices (13 and 15) is directly connected with a temperature sensor which on attainment of the desired temperature acts on the associated closure device (13 or 15) in the sense of opening.
  6. Laundry drier according to one of the preceding claims, characterised in that a temperature signal of a measuring device (17) in the process air channel (2) or at the compressor (8) acts as criterion for the switching of the closure devices (13 and 15).
  7. Laundry drier according to claim 6, characterised in that the measuring device is a temperature sensor (17).
  8. Laundry drier according to claim 6 or 7, characterised in that the measuring device (17) is arranged in the process air channel (2) between the condensor (6) and the laundry drying chamber, but ahead of the exhaust air opening (12) in flow direction.
EP91111341A 1990-07-19 1991-07-08 Clothes dryer with heat pump Expired - Lifetime EP0467188B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4023000A DE4023000C2 (en) 1990-07-19 1990-07-19 Tumble dryer with a heat pump circuit
DE4023000 1990-07-19

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EP0467188A1 EP0467188A1 (en) 1992-01-22
EP0467188B1 true EP0467188B1 (en) 2001-04-04

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EP (1) EP0467188B1 (en)
DE (2) DE4023000C2 (en)
ES (1) ES2158839T3 (en)

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WO2009059889A1 (en) 2007-11-06 2009-05-14 BSH Bosch und Siemens Hausgeräte GmbH Household appliance having a heat pump unit and means for cooling a component thereof
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DE4023000C2 (en) 2003-02-27
EP0467188A1 (en) 1992-01-22
DE4023000A1 (en) 1992-01-23
DE59109209D1 (en) 2001-05-10
ES2158839T3 (en) 2001-09-16

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