EP2106474A1 - Method for removing lint from a heat exchanger of a domestic appliance and corresponding domestic appliance - Google Patents

Method for removing lint from a heat exchanger of a domestic appliance and corresponding domestic appliance

Info

Publication number
EP2106474A1
EP2106474A1 EP07822851A EP07822851A EP2106474A1 EP 2106474 A1 EP2106474 A1 EP 2106474A1 EP 07822851 A EP07822851 A EP 07822851A EP 07822851 A EP07822851 A EP 07822851A EP 2106474 A1 EP2106474 A1 EP 2106474A1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
domestic appliance
air flow
cleaning
rinsing liquid
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.)
Granted
Application number
EP07822851A
Other languages
German (de)
French (fr)
Other versions
EP2106474B1 (en
Inventor
Klaus Grunert
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete 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 Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP2106474A1 publication Critical patent/EP2106474A1/en
Application granted granted Critical
Publication of EP2106474B1 publication Critical patent/EP2106474B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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 
    • 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

Definitions

  • the invention relates to a method for removing during a drying process of a domestic appliance for the care of laundry items, in particular a clothes dryer, produced lint from a heat exchanger, wherein for cleaning a rinsing liquid is passed through the heat exchanger.
  • the invention relates to a domestic appliance for the care of laundry, comprising a heat exchanger, a process air blower for driving an air flow through the heat exchanger, a collecting container for a rinsing liquid for removing generated during a drying process lint from the heat exchanger, wherein in a cleaning phase, the rinsing liquid through the Heat exchanger is passed, and a control device for controlling the cleaning.
  • clothes dryers which have a compressor heat pump for alternately heating and cooling a circulating process air flow.
  • these units also have additional filter systems to prevent leaching of the associated refrigerant heat exchangers.
  • Such heat exchangers are relatively fine structured with a large variety of fins to create a good heat transfer from the circulating in the heat pump working or refrigerant to the process air flow, and therefore more than heat exchangers in conventional clothes dryers without heat pumps prone to contamination by lint
  • the corresponding filter systems consist of several sieves connected in series, filter foams or the like for the removal of the fine lint from the process air which has passed through the normal lint filter.
  • the built-in home appliance heat exchanger should be kept free of fine lint, so as to achieve a good heat transfer from the refrigerant to the process air flow.
  • the filter systems are installed in the area of the device base, the maintenance is or cleaning only very cumbersome.
  • the cleaning cycles are relatively short and the cleaning itself very expensive.
  • the removal of the lint accumulated therein should be effective.
  • a correspondingly upgraded home appliance should be specified.
  • a rinsing liquid is passed through the heat exchanger.
  • the rinsing liquid is deflected during a cleaning phase depending on the strength of a producible air flow, and depending on this deflection, the rinsing liquid flows through different areas of the heat exchanger.
  • the flushing liquid can be directed individually to different locations of the heat exchanger, virtually all areas of the heat exchanger can be freed from lint.
  • the household appliance for the care of laundry items, comprising a heat exchanger, a process air blower for driving an air flow through the heat exchanger, a collecting container for a rinsing liquid for removing generated during a drying process lint from the heat exchanger, wherein in a cleaning phase, the rinsing liquid passed through the heat exchanger and a control device for controlling the cleaning, the control device is set up such that during the cleaning phase, the process air blower is operable to drive the air flow, wherein the flushing liquid is deflected depending on the strength of the air flow and flows through different areas of the heat exchanger depending on the deflection
  • the air flow is generated by a process air blower of the domestic appliance and passed through the heat exchanger.
  • the already provided in the household appliance unit of the process air blower is thus used multifunctional. Depending on the operating state of the process air blower, an air flow is thus generated or not.
  • the flushing liquid is passed through a front portion of the heat exchanger when the generation of the airflow is deactivated.
  • a front region is understood as meaning that part of the heat exchanger which, when the air flow is activated in the flow direction, is provided as an air inflow region and is therefore first reached by the circulating process air flow.
  • the front portion of the heat exchanger is cleaned by flowing the flushing liquid through this front portion.
  • the rinsing liquid preferably flows through a rear area of the heat exchanger in the flow direction of the air flow when the generation of the air flow is activated.
  • the incoming rinsing liquid is preferably deflected in such a way that it flows through the rear region of the heat exchanger and thus rinses out the lint accumulated there.
  • the heat exchanger is associated with a heat pump of the domestic appliance.
  • the heat pump can be designed as a compressor heat pump.
  • a compressor for the working or refrigerant chlorinated and / or fluorinated hydrocarbon or carbon dioxide
  • a throttle is arranged in a known manner between two heat exchangers.
  • the refrigerant is evaporated at low pressure, whereby it absorbs heat and thus cools the process air flow.
  • the vaporized refrigerant is compressed in a compressor to a relatively high pressure and fed to the second heat exchanger, where it heats the process air stream by releasing heat and thereby liquefied.
  • the liquefied refrigerant is depressurized to the mentioned low pressure, and thus passes back to the first heat exchanger.
  • the cleaning of the heat exchangers and thus the removal of the fluff from the heat exchangers is preferably carried out at the end of a drying process of laundry items introduced in the domestic appliance and, in particular, at a time when the fluff is still moist.
  • the rinsing liquid is preferably introduced from above into the heat exchanger and then flows around the fins of the heat exchanger. Due to the achievable high flow rate and the possibility of introducing a relatively large amount of liquid, the adhering fluff can be effectively washed away.
  • the domestic appliance comprises a line with a controllable by the control valve, which line connects the sump with the heat exchanger.
  • Fig. 1 is a perspective view of essential for the following explanation components of a household appliance.
  • Fig. 2 is a sectional view along the section line AA gem. Fig. 1.
  • a tumble dryer 1 comprises a compressor heat pump 2 (cf the description above, only partially shown here for the sake of clarity), which comprises a heat exchanger 2.
  • the heat exchanger 2 comprises a plurality of fins 21 and is coupled to a process air guide. It can thereby be achieved that, during operation of the tumble dryer 1, in particular during a drying phase, process air is conducted as airflow 4 in the illustrated arrow through the heat exchanger 2.
  • the air stream 4 generated in the process air guide is generated by a process air blower 6, which is shown only schematically, which can be activated and deactivated as required.
  • the tumble dryer 1 comprises a collecting container 3, which is arranged in a vertical direction at a higher level than the heat exchanger 2.
  • the collecting container 3 is condensate, which is generated during the drying process and pumped into the collecting container 3.
  • a line 5 is arranged, through which the liquid contained in the collecting container 3 can be passed to the heat exchanger 2.
  • the conduit 5 can be released or closed.
  • a control device 8 is set up, in particular programmed, to control the process of removing lint from the heat exchanger 2 generated during a drying process (which it also preferably controls) can. For this purpose, it controls, as indicated by corresponding arrows, the process air blower 6 and the valve 7. The corresponding method steps are explained below.
  • the condensate collected in the collecting container 3 is passed through the heat exchanger 2.
  • the condensate serves as a rinsing liquid to rinse the lint from the heat exchanger 2 can.
  • FIG. 2 shows a schematic sectional view along the section line AA according to FIG. 1.
  • the airflow 4 generated by the process air blower flows in at a front-flow area 22 of the heat exchanger 2 and exits at a downstream end or rear area 23.
  • the arrangement of the line 5 on the heat exchanger 2 is formed so that the rinsing liquid is introduced from above in the front region 22 in the heat exchanger 2. If the process air blower is switched off and thus no air flow 4 is generated, then the rinsing liquid flows from top to bottom through the heat exchanger 2 essentially into this front region 22, which, for example, extends approximately to the middle (viewed in the x direction).
  • the process air blower is activated or remains activated and the air stream 4 flows through the heat exchanger 2 in the flow direction shown, the rinsing liquid stream introduced at the front region 22 is deflected in the x direction, whereby the rear region 23 of the heat exchanger 2 also flows through this rinsing liquid will be rinsed and there attaching lint.
  • the flow course of the flushing fluid can thus also be influenced.
  • the flushing liquid can be deflected into different regions of the heat exchanger 2 by the air flow 4, as a result of which different areas can also be flowed through by the flushing liquid.
  • the condensate is collected in the collecting container 3.
  • a discharge opening of the collecting container 3 is released and the condensate used as a rinsing liquid is passed through a possibly formed with a large cross section line 5 to the heat exchanger 2 and from above rinsed over the fins 21 of the heat exchanger 2.
  • a relatively large opening 24 is formed so that a blockage of the opening, for example by lint, can be prevented.
  • the lint can then be pumped with the condensate into the sewage system. It can also be provided that at least two times flushing of the heat exchanger 2 is performed, and the flushing liquid is pumped after a first run again in the collecting container 3 and then flows through the heat exchanger 2 again.

Landscapes

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

Abstract

A method is provided for the removal from a heat exchange of lint that is generated during a drying process in a domestic appliance for laundry care. A rinsing fluid is run through the heat exchanger for cleaning and the rinsing fluid is deflected during a cleaning phase with the magnitude of deflection or the direction of deflection of the rinsing fluid being a function of the strength of an air flow that is applied to deflect the rinsing fluid. The rinsing fluid is thus run through various regions of the heat exchanger depending on the deflection.

Description

Verfahren zum Entfernen von Flusen aus einem Wärmetauscher eines Hausgeräts, sowie entsprechendes Hausgerät Method for removing lint from a heat exchanger of a domestic appliance, and corresponding domestic appliance
Die Erfindung betrifft ein Verfahren zum Entfernen von während eines Trocknungsprozesses eines Hausgeräts zur Pflege von Wäschestücken, insbesondere eines Wäschetrockners, erzeugten Flusen aus einem Wärmetauscher, bei dem zum Reinigen eine Spülflüssigkeit durch den Wärmetauscher geleitet wird.The invention relates to a method for removing during a drying process of a domestic appliance for the care of laundry items, in particular a clothes dryer, produced lint from a heat exchanger, wherein for cleaning a rinsing liquid is passed through the heat exchanger.
Auch betrifft die Erfindung ein Hausgerät zur Pflege von Wäschestücken , umfassend einem Wärmetauscher, ein Prozessluftgebläse zum Treiben eines Luftstroms durch den Wärmetauscher, einen Sammelbehälter für eine Spülflüssigkeit zum Entfernen von während eines Trocknungsprozesses erzeugten Flusen aus dem Wärmetauscher, wobei in einer Reinigungsphase die Spülflüssigkeit durch den Wärmetauscher geleitet wird, sowie eine Steuereinrichtung zum Steuern des Reinigens.Also, the invention relates to a domestic appliance for the care of laundry, comprising a heat exchanger, a process air blower for driving an air flow through the heat exchanger, a collecting container for a rinsing liquid for removing generated during a drying process lint from the heat exchanger, wherein in a cleaning phase, the rinsing liquid through the Heat exchanger is passed, and a control device for controlling the cleaning.
Ein derartiges Verfahren sowie ein derartiges Hausgerät sind aus der DE 37 38 031 C2 bekannt.Such a method and such a domestic appliance are known from DE 37 38 031 C2.
Darüber hinaus sind Wäschetrockner bekannt, welche eine Kompressor-Wärmepumpe zum abwechselnden Aufheizen und Abkühlen eines zirkulierender Prozessluftstroms aufweisen. Diese Geräte haben neben dem normalen Flusensieb noch zusätzliche Filtersysteme, um eine Verflusung der zugehörigen Kältemittel-Wärmetauscher zu vermeiden. Solche Wärmetauscher sind zur Schaffung eines guten Wärmeübergangs von dem in der Wärmepumpe zirkulierenden Arbeits- oder Kältemittel auf den Prozessluftstrom, der den eigentlichen Trockenvorgang bewirkt, relativ feingliedrig mit einer großen Vielzahl von Lamellen strukturiert und deshalb mehr als Wärmetauscher in üblichen Wäschetrocknern ohne Wärmepumpen anfällig für Verschmutzung durch Flusen Die entsprechenden Filtersysteme bestehen aus mehreren hintereinander geschalteten Sieben, Filterschäumen oder Ähnlichem zur Entfernung der durch das normale Flusensieb hindurchgegangenen Feinflusen aus der Prozessluft. Dadurch sollen die fest im Hausgerät eingebauten Wärmetauscher frei von Feinflusen gehalten werden, um damit einen guten Wärmeübergang vom Kältemittel auf den Prozessluftstrom zu erreichen. Da die Filtersysteme jedoch im Bereich des Gerätesockels eingebaut sind, ist die Wartung oder Reinigung nur sehr umständlich durchzuführen. Darüber hinaus sind die Reinigungszyklen relativ kurz und die Reinigung an sich sehr aufwändig.In addition, clothes dryers are known, which have a compressor heat pump for alternately heating and cooling a circulating process air flow. In addition to the standard lint filter, these units also have additional filter systems to prevent leaching of the associated refrigerant heat exchangers. Such heat exchangers are relatively fine structured with a large variety of fins to create a good heat transfer from the circulating in the heat pump working or refrigerant to the process air flow, and therefore more than heat exchangers in conventional clothes dryers without heat pumps prone to contamination by lint The corresponding filter systems consist of several sieves connected in series, filter foams or the like for the removal of the fine lint from the process air which has passed through the normal lint filter. As a result, the built-in home appliance heat exchanger should be kept free of fine lint, so as to achieve a good heat transfer from the refrigerant to the process air flow. However, since the filter systems are installed in the area of the device base, the maintenance is or cleaning only very cumbersome. In addition, the cleaning cycles are relatively short and the cleaning itself very expensive.
Daher ist es Aufgabe der vorliegenden Erfindung, ein Verfahren zu schaffen, bei dem das Entfernen der Flusen in einem Wärmetauscher eines Hausgeräts zur Pflege von Wäschestücken verbessert erfolgen kann. Insbesondere bei einem Durchleiten von Spülflüssigkeit durch den Wärmetauscher soll das Entfernen der darin angesammelten Flusen effektiv erfolgen. Auch soll ein entsprechend ertüchtigtes Hausgerät angegeben werden.It is therefore an object of the present invention to provide a method in which the removal of the lint can be improved in a heat exchanger of a household appliance for the care of laundry. In particular, in a passage of rinsing liquid through the heat exchanger, the removal of the lint accumulated therein should be effective. Also, a correspondingly upgraded home appliance should be specified.
Diese Aufgabe wird durch ein Verfahren, welches die Merkmale nach Patentanspruch 1 aufweist, und ein Hausgerät, welches die Merkmale des Patentanspruchs 8 aufweist, gelöst. Bevorzugte Weiterbildungen der Erfindung sind in den abhängigen Patentansprüchen angegeben. Bevorzugten Weiterbildungen des Verfahrens entsprechen bevorzugte Weiterbildungen des Hausgerätes, auch wenn dies nicht in jedem Falle explizit angegeben wird.This object is achieved by a method having the features of claim 1, and a domestic appliance having the features of claim 8. Preferred developments of the invention are specified in the dependent claims. Preferred developments of the method correspond to preferred developments of the domestic appliance, even if this is not explicitly stated in each case.
Bei dem erfindungsgemäßen Verfahren zum Entfernen von während eines Trocknungsprozesses eines Hausgeräts zur Pflege von Wäschestücken erzeugten Flusen aus einem Wärmetauscher wird eine Spülflüssigkeit durch den Wärmetauscher geleitet. Die Spülflüssigkeit wird während einer Reinigungsphase abhängig von der Stärke eines erzeugbaren Luftstroms abgelenkt, und abhängig von dieser Ablenkung strömt die Spülflüssigkeit durch verschiedene Bereiche des Wärmetauschers. Dadurch kann hocheffektiv das Entfernen von Flusen aus den Wärmetauschern erreicht werden. Indem die Spülflüssigkeit individuell an unterschiedliche Stellen des Wärmetauschers gelenkt werden kann, können praktisch alle Bereiche des Wärmetauschers von Flusen befreit werden. Dadurch kann neben einem relativ einfachen und aufwandsarmen Vorgang auch eine verbesserte Reinigung gewährleistet werden. Somit werden durch diese effiziente Reinigung Ablagerungen an den Lamellen des Wärmetauschers sowohl im vorderen als auch im hinteren Bereich beseitigt. Dadurch werden die Leistungsdaten des Geräts, insbesondere der Energieverbrauch und der Zeitbedarf, optimiert. Darüber hinaus ist es nicht mehr erforderlich, eine anderweitige Reinigung von Filtersystemen zwingend vorzunehmen. Bei dem erfindungsgemäßen Hausgerät zur Pflege von Wäschestücken , umfassend einem Wärmetauscher, ein Prozessluftgebläse zum Treiben eines Luftstroms durch den Wärmetauscher, einen Sammelbehälter für eine Spülflüssigkeit zum Entfernen von während eines Trocknungsprozesses erzeugten Flusen aus dem Wärmetauscher, wobei in einer Reinigungsphase die Spülflüssigkeit durch den Wärmetauscher geleitet wird, sowie eine Steuereinrichtung zum Steuern des Reinigens ist die Steuereinrichtung derart eingerichtet, dass während der Reinigungsphase das Prozessluftgebläse zum Treiben des Luftstroms betreibbar ist, wobei die Spülflüssigkeit abhängig von der Stärke des Luftstroms abgelenkt wird und abhängig von der Ablenkung durch verschiedene Bereiche des Wärmetauscher strömtIn the method according to the invention for removing lint from a heat exchanger generated during a drying process of a domestic appliance for the care of items of laundry, a rinsing liquid is passed through the heat exchanger. The rinsing liquid is deflected during a cleaning phase depending on the strength of a producible air flow, and depending on this deflection, the rinsing liquid flows through different areas of the heat exchanger. As a result, the removal of lint from the heat exchangers can be achieved highly effectively. By the flushing liquid can be directed individually to different locations of the heat exchanger, virtually all areas of the heat exchanger can be freed from lint. As a result, in addition to a relatively simple and low-effort process, an improved cleaning can be ensured. Thus, this efficient cleaning eliminates deposits on the fins of the heat exchanger both in the front and in the rear. This optimizes the performance of the device, especially energy consumption and time. In addition, it is no longer necessary to make another cleaning of filter systems mandatory. In the household appliance according to the invention for the care of laundry items, comprising a heat exchanger, a process air blower for driving an air flow through the heat exchanger, a collecting container for a rinsing liquid for removing generated during a drying process lint from the heat exchanger, wherein in a cleaning phase, the rinsing liquid passed through the heat exchanger and a control device for controlling the cleaning, the control device is set up such that during the cleaning phase, the process air blower is operable to drive the air flow, wherein the flushing liquid is deflected depending on the strength of the air flow and flows through different areas of the heat exchanger depending on the deflection
Bevorzugt wird der Luftstrom durch ein Prozessluftgebläse des Hausgeräts erzeugt und durch den Wärmetauscher geleitet. Die ohnehin im Hausgerät vorgesehene Einheit des Prozessluftgebläses wird somit multifunktional verwendet. Abhängig vom Betriebszustand des Prozessluftgebläses wird somit ein Luftstrom erzeugt oder nicht.Preferably, the air flow is generated by a process air blower of the domestic appliance and passed through the heat exchanger. The already provided in the household appliance unit of the process air blower is thus used multifunctional. Depending on the operating state of the process air blower, an air flow is thus generated or not.
Bevorzugt wird die Spülflüssigkeit durch einen vorderen Bereich des Wärmetauschers geleitet, wenn die Erzeugung des Luftstroms deaktiviert ist. Unter einem vorderen Bereich wird derjenige Teil des Wärmetauschers verstanden, welcher bei aktiviertem Luftstrom in Strömungsrichtung als Lufteinströmbereich vorgesehen ist und deshalb von dem zirkulierenden Prozessluftstrom zuerst erreicht wird. Wenn also das Prozessluftgebläse abgeschaltet ist, wird der vordere Bereich des Wärmetauschers gereinigt, indem die Spülflüssigkeit durch diesen vorderen Bereich strömt.Preferably, the flushing liquid is passed through a front portion of the heat exchanger when the generation of the airflow is deactivated. A front region is understood as meaning that part of the heat exchanger which, when the air flow is activated in the flow direction, is provided as an air inflow region and is therefore first reached by the circulating process air flow. Thus, when the process air blower is turned off, the front portion of the heat exchanger is cleaned by flowing the flushing liquid through this front portion.
Die Spülflüssigkeit strömt in bevorzugter Weise durch einen in Strömungsrichtung des Luftstroms hinteren Bereich des Wärmetauschers, wenn die Erzeugung des Luftstroms aktiviert ist. Bevorzugt wird somit bei eingeschaltetem Prozessluftgebläse die einströmende Spülflüssigkeit so abgelenkt, dass sie durch den hinteren Bereich des Wärmetauschers strömt und somit die dort angesammelten Flusen ausspült.The rinsing liquid preferably flows through a rear area of the heat exchanger in the flow direction of the air flow when the generation of the air flow is activated. Thus, when the process air blower is switched on, the incoming rinsing liquid is preferably deflected in such a way that it flows through the rear region of the heat exchanger and thus rinses out the lint accumulated there.
Bei laufendem Prozessluftgebläse wird die Flüssigkeit somit durch den statischen und dynamischen Druck der Prozessluft weiter zwischen die Lamellen des Wärmetauschers gedrückt, wodurch eine Reinigung der hinteren Lamellenbereiche erreicht werden kann. Bevorzugt wird zum Reinigen des Wärmetauschers als Spülflüssigkeit ein während eines Trocknungsprozesses in dem Hausgerät erzeugtes Kondensat gesammelt. Somit wird auch hier Material sparend eine Flüssigkeit verwendet, welche während des Trocknungsprozesses anfällt. Eine separate zusätzliche Flüssigkeit zum Reinigen ist daher nicht erforderlich. Durch diese Ausführung wird ein eigentlich als Abfall abfallendes Produkt, das Kondensat, sinnvoll zur Reinigung der Wärmetauscher genutzt.When the process air blower is running, the liquid is thus pressed further between the fins of the heat exchanger due to the static and dynamic pressure of the process air, as a result of which cleaning of the rear lamella areas can be achieved. For purifying the heat exchanger, a condensate produced in the household appliance during a drying process is preferably collected as rinsing liquid. Thus, a fluid is used here also saving material, which is obtained during the drying process. A separate additional liquid for cleaning is therefore not required. With this design, a product that actually drops as waste, the condensate, is used to purify the heat exchangers.
Bevorzugt ist der Wärmetauscher einer Wärmepumpe des Hausgeräts zugeordnet. Die Wärmepumpe kann als Kompressor-Wärmepumpe ausgebildet sein. Darin sind in bekannter Weise zwischen zwei Wärmetauschern ein Kompressor für das Arbeits- oder Kältemittel (chlorierter und/oder fluorierter Kohlenwasserstoff oder Kohlendioxid) und eine Drossel angeordnet. In einem ersten Wärmetauscher, welcher derjenige ist, welcher von dem mit Feuchte beladenen Prozessluftstrom zuerst angeströmt wird und deshalb besonders gefährdet für eine Verschmutzung durch Flusen ist, wird das Kältemittel bei geringem Druck verdampft, wobei es Wärme aufnimmt und den Prozessluftstrom somit kühlt. Das verdampfte Kältemittel wird in einem Kompressor auf einen relativ hohen Druck komprimiert und dem zweiten Wärmetauscher zugeführt, wo es den Prozessluftstrom durch Abgabe von Wärme heizt und dabei verflüssigt wird. In einer auf den zweiten Wärmetauscher folgenden Drossel wird das verflüssigte Kältemittel auf den erwähnten geringen Druck entspannt, und gelangt so wieder zum ersten Wärmetauscher.Preferably, the heat exchanger is associated with a heat pump of the domestic appliance. The heat pump can be designed as a compressor heat pump. Therein, a compressor for the working or refrigerant (chlorinated and / or fluorinated hydrocarbon or carbon dioxide) and a throttle are arranged in a known manner between two heat exchangers. In a first heat exchanger, which is the one which is first flown by the process air stream laden with moisture and is therefore particularly at risk for pollution by fluff, the refrigerant is evaporated at low pressure, whereby it absorbs heat and thus cools the process air flow. The vaporized refrigerant is compressed in a compressor to a relatively high pressure and fed to the second heat exchanger, where it heats the process air stream by releasing heat and thereby liquefied. In a subsequent to the second heat exchanger throttle the liquefied refrigerant is depressurized to the mentioned low pressure, and thus passes back to the first heat exchanger.
Bevorzugt wird das Reinigen der Wärmetauscher und somit das Entfernen der Flusen aus den Wärmetauschern gegen Ende eines Trocknungsprozesses von in dem Hausgerät eingebrachten Wäschestücken durchgeführt und insbesondere zu einem Zeitpunkt, zu dem die Flusen noch feucht sind, durchgeführt.The cleaning of the heat exchangers and thus the removal of the fluff from the heat exchangers is preferably carried out at the end of a drying process of laundry items introduced in the domestic appliance and, in particular, at a time when the fluff is still moist.
Die Spülflüssigkeit wird vorzugsweise von oben in den Wärmetauscher eingeleitet und umspült dann die Lamellen des Wärmetauschers. Durch die dadurch erzielbare hohe Strömungsgeschwindigkeit und die Möglichkeit einer Einleitung einer relativ großen Flüssigkeitsmenge können die anhaftenden Flusen effektiv weggespült werden.The rinsing liquid is preferably introduced from above into the heat exchanger and then flows around the fins of the heat exchanger. Due to the achievable high flow rate and the possibility of introducing a relatively large amount of liquid, the adhering fluff can be effectively washed away.
Bevorzugt umfasst das Hausgerät eine Leitung mit einem von der Steuereinrichtung steuerbaren Ventil, welche Leitung den Sammelbehälter mit dem Wärmetauscher verbindet. Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand schematischer Zeichnungen näher erläutert. Es zeigen:Preferably, the domestic appliance comprises a line with a controllable by the control valve, which line connects the sump with the heat exchanger. An embodiment of the invention will be explained in more detail with reference to schematic drawings. Show it:
Fig. 1 eine perspektivische Darstellung von für die nachfolgende Erläuterung wesentlichen Komponenten eines Hausgeräts; undFig. 1 is a perspective view of essential for the following explanation components of a household appliance; and
Fig. 2 eine Schnittdarstellung entlang der Schnittlinie AA gem. Fig. 1.Fig. 2 is a sectional view along the section line AA gem. Fig. 1.
In den Figuren sind gleiche oder funktionsgleiche Elemente mit den gleichen Bezugszeichen versehen.In the figures, identical or functionally identical elements are provided with the same reference numerals.
Ein Wäschetrockner 1 umfasst eine Kompressor-Wärmepumpe 2 (vgl. obige Beschreibung; hier der Übersicht halber nur teilweise dargestellt), welche einen Wärmetauscher 2 umfasst. Der Wärmetauscher 2 umfasst eine Mehrzahl von Lamellen 21 und ist mit einer Prozessluftführung gekoppelt. Dadurch kann erreicht werden, dass im Betrieb des Wäschetrockners 1 , insbesondere während einer Trocknungsphase, Prozessluft als Luftstrom 4 in der gezeigten Pfeildarstellung durch den Wärmetauscher 2 geleitet wird. Der in der Prozessluftführung erzeugte Luftstrom 4 wird durch ein nur schematisch dargestelltes Prozessluftgebläse 6 erzeugt, welches bedarfsabhängig aktiviert und deaktiviert werden kann.A tumble dryer 1 comprises a compressor heat pump 2 (cf the description above, only partially shown here for the sake of clarity), which comprises a heat exchanger 2. The heat exchanger 2 comprises a plurality of fins 21 and is coupled to a process air guide. It can thereby be achieved that, during operation of the tumble dryer 1, in particular during a drying phase, process air is conducted as airflow 4 in the illustrated arrow through the heat exchanger 2. The air stream 4 generated in the process air guide is generated by a process air blower 6, which is shown only schematically, which can be activated and deactivated as required.
Darüber hinaus umfasst der Wäschetrockner 1 einen Sammelbehälter 3, welcher in vertikaler Richtung auf einem höheren Niveau angeordnet ist als der Wärmetauscher 2. In dem Sammelbehälter 3 befindet sich Kondensat, welches beim Trocknungsprozess erzeugt und in den Sammelbehälter 3 gepumpt wird.In addition, the tumble dryer 1 comprises a collecting container 3, which is arranged in a vertical direction at a higher level than the heat exchanger 2. In the collecting container 3 is condensate, which is generated during the drying process and pumped into the collecting container 3.
Zwischen dem Sammelbehälter 3 und dem Wärmetauscher 2 ist eine Leitung 5 angeordnet, durch welche die in dem Sammelbehälter 3 enthaltene Flüssigkeit zum Wärmetauscher 2 geleitet werden kann. Mittels eines Ventils 7 kann die Leitung 5 frei gegeben oder verschlossen werden.Between the collecting container 3 and the heat exchanger 2, a line 5 is arranged, through which the liquid contained in the collecting container 3 can be passed to the heat exchanger 2. By means of a valve 7, the conduit 5 can be released or closed.
Eine Steuereinrichtung 8 ist so eingerichtet, insbesondere programmiert, dass sie das Verfahren zum Entfernen von während eines Trocknungsprozesses (welchen sie vorzugsweise ebenfalls steuert) erzeugten Flusen aus dem Wärmetauscher 2 steuern kann. Dazu steuert sie, wie durch entsprechende Pfeile angedeutet, das Prozessluftgebläse 6 und das Ventil 7. Die entsprechenden Verfahrensschritte sind nachfolgend erläutert.A control device 8 is set up, in particular programmed, to control the process of removing lint from the heat exchanger 2 generated during a drying process (which it also preferably controls) can. For this purpose, it controls, as indicated by corresponding arrows, the process air blower 6 and the valve 7. The corresponding method steps are explained below.
Um Flusen, welche sich im Wärmetauscher 2, und insbesondere an den Lamellen 21 während eines Trocknungsprozesses ansammeln, zu entfernen, wird während einer Reinigungsphase das in dem Sammelbehälter 3 gesammelte Kondensat durch den Wärmetauscher 2 geleitet. Das Kondensat dient dabei als Spülflüssigkeit, um die Flusen aus dem Wärmetauscher 2 ausspülen zu können.In order to remove lint, which accumulate in the heat exchanger 2, and in particular on the lamellae 21 during a drying process, during a cleaning phase, the condensate collected in the collecting container 3 is passed through the heat exchanger 2. The condensate serves as a rinsing liquid to rinse the lint from the heat exchanger 2 can.
In Fig. 2 ist eine schematische Schnittdarstellung entlang der Schnittlinie AA gemäß Fig. 1 gezeigt. Wie dort zu erkennen ist, strömt der durch das Prozessluftgebläse erzeugte Luftstrom 4 an einem in Strömungsrichtung vorderen Bereich 22 des Wärmetauschers 2 ein und tritt an einem in Strömungsrichtung hinteren Ende bzw. hinteren Bereich 23 wieder aus. Die Anordnung der Leitung 5 auf dem Wärmetauscher 2 ist so ausgebildet, dass die Spülflüssigkeit von oben im vorderen Bereich 22 in den Wärmetauscher 2 eingeleitet wird. Wird das Prozessluftgebläse abgeschaltet und somit auch kein Luftstrom 4 erzeugt, so strömt die Spülflüssigkeit von oben nach unten durch den Wärmetauscher 2 im Wesentlichen in diesen vorderen Bereich 22, welcher beispielhaft in etwa bis zur Mitte (in x-Richtung betrachtet) reicht.FIG. 2 shows a schematic sectional view along the section line AA according to FIG. 1. As can be seen there, the airflow 4 generated by the process air blower flows in at a front-flow area 22 of the heat exchanger 2 and exits at a downstream end or rear area 23. The arrangement of the line 5 on the heat exchanger 2 is formed so that the rinsing liquid is introduced from above in the front region 22 in the heat exchanger 2. If the process air blower is switched off and thus no air flow 4 is generated, then the rinsing liquid flows from top to bottom through the heat exchanger 2 essentially into this front region 22, which, for example, extends approximately to the middle (viewed in the x direction).
Wird das Prozessluftgebläse aktiviert oder bleibt weiterhin aktiviert und der Luftstrom 4 strömt durch den Wärmetauscher 2 in der gezeigten Strömungsrichtung, so wird der am vorderen Bereich 22 eingeleitete Spülflüssigkeitsstrom in x-Richtung abgelenkt, wodurch auch der hintere Bereich 23 des Wärmetauschers 2 von dieser Spülflüssigkeit durchströmt wird und dort anlagernde Flusen ausgespült werden.If the process air blower is activated or remains activated and the air stream 4 flows through the heat exchanger 2 in the flow direction shown, the rinsing liquid stream introduced at the front region 22 is deflected in the x direction, whereby the rear region 23 of the heat exchanger 2 also flows through this rinsing liquid will be rinsed and there attaching lint.
Abhängig davon, ob ein Luftstrom 4 erzeugt wird oder nicht bzw. mit welcher Stärke der Luftstrom erzeugt wird, kann somit auch der Strömungsverlauf der Spülflüssigkeit beeinflusst werden. Insbesondere kann durch den Luftstrom 4 die Spülflüssigkeit in unterschiedliche Bereiche des Wärmetauschers 2 abgelenkt werden, wodurch auch unterschiedliche Bereiche von der Spülflüssigkeit durchströmt werden können. Um große Flüssigkeitsmengen für die Reinigung bereitstellen zu können, wird das Kondensat im Sammelbehälter 3 gesammelt. Gegen Ende des Trocknungsprozesses und zu einem Zeitpunkt, zu dem die an die Wärmetauscherflächen anhaftenden Flusen noch feucht sind, wird eine Entleerungsöffnung des Sammelbehälters 3 freigegeben und das als Spülflüssigkeit verwendete Kondensat über eine möglichst mit großem Querschnitt ausgebildete Leitung 5 zum Wärmetauscher 2 geführt und von oben über die Lamellen 21 des Wärmetauschers 2 gespült. Dazu ist insbesondere eine relativ große Öffnung 24 ausgebildet, damit eine Verstopfung der Öffnung, beispielsweise durch Flusen, verhindert werden kann.Depending on whether or not an air flow 4 is generated or with which intensity the air flow is generated, the flow course of the flushing fluid can thus also be influenced. In particular, the flushing liquid can be deflected into different regions of the heat exchanger 2 by the air flow 4, as a result of which different areas can also be flowed through by the flushing liquid. In order to be able to provide large amounts of liquid for cleaning, the condensate is collected in the collecting container 3. Towards the end of the drying process and at a time when the lint adhering to the heat exchanger surfaces are still wet, a discharge opening of the collecting container 3 is released and the condensate used as a rinsing liquid is passed through a possibly formed with a large cross section line 5 to the heat exchanger 2 and from above rinsed over the fins 21 of the heat exchanger 2. For this purpose, in particular a relatively large opening 24 is formed so that a blockage of the opening, for example by lint, can be prevented.
Durch die hohe Strömungsgeschwindigkeit und die große Flüssigkeitsmenge werden an den Lamellen 21 anhaftende Flusen weggespült. Die Flusen können mit dem Kondensat anschließend in das Abwassersystem abgepumpt werden. Es kann auch vorgesehen sein, dass ein zumindest zweimaliges Durchspülen des Wärmetauschers 2 durchgeführt wird, und die Spülflüssigkeit nach einem erstmaligen Durchlauf wieder in den Sammelbehälter 3 gepumpt wird und dann nochmals durch den Wärmetauscher 2 strömt. Due to the high flow rate and the large amount of liquid lint adhering to the lamellae 21 are washed away. The lint can then be pumped with the condensate into the sewage system. It can also be provided that at least two times flushing of the heat exchanger 2 is performed, and the flushing liquid is pumped after a first run again in the collecting container 3 and then flows through the heat exchanger 2 again.

Claims

Patentansprüche claims
1. Verfahren zum Entfernen von während eines Trocknungsprozesses eines Hausgeräts (1 ) zur Pflege von Wäschestücken erzeugten Flusen aus einem Wärmetauscher (2), bei dem zum Reinigen eine Spülflüssigkeit durch den Wärmetauscher (2) geleitet wird, dadurch gekennzeichnet, dass dieAnspruch [en] A method for removing lint produced during a drying process of a domestic appliance (1) for the care of laundry items from a heat exchanger (2), in which a rinsing liquid is passed through the heat exchanger (2) for cleaning, characterized in that the
Spülflüssigkeit während einer Reinigungsphase abhängig von der Stärke eines Luftstroms (4) abgelenkt wird und abhängig von der Ablenkung durch verschiedene Bereiche (22, 23) des Wärmetauscher (2) strömt.Rinsing fluid is deflected during a cleaning phase depending on the strength of an air flow (4) and depending on the deflection through different areas (22, 23) of the heat exchanger (2) flows.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass der Luftstrom (4) durch ein Prozessluftgebläse (6) des Hausgeräts (1 ) erzeugt wird und durch den Wärmetauscher (2) strömt.2. The method according to claim 1, characterized in that the air flow (4) by a process air blower (6) of the domestic appliance (1) is generated and flows through the heat exchanger (2).
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Spülflüssigkeit durch einen in Strömungsrichtung des Luftstroms (4) vorderen3. The method according to claim 1 or 2, characterized in that the rinsing liquid by a in the flow direction of the air flow (4) front
Bereich (22) des Wärmetauschers (2) strömt, wenn die Erzeugung des Luftstroms (4) deaktiviert ist.Area (22) of the heat exchanger (2) flows when the generation of the air flow (4) is deactivated.
4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Spülflüssigkeit durch einen in Strömungsrichtung des Luftstroms (4) hinteren Bereich (23) des Wärmetauschers (2) strömt, wenn die Erzeugung des Luftstroms (4) aktiviert ist.4. The method according to any one of the preceding claims, characterized in that the rinsing liquid flows through a in the flow direction of the air flow (4) rear portion (23) of the heat exchanger (2) when the generation of the air flow (4) is activated.
5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zum Reinigen des Wärmetauschers (2) als Spülflüssigkeit ein während eines5. The method according to any one of the preceding claims, characterized in that for cleaning the heat exchanger (2) as a rinsing liquid during a
Trocknungsprozesses in dem Hausgerät (1 ) erzeugtes Kondensat gesammelt wird.Drying process collected in the domestic appliance (1) condensate is collected.
6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Reinigen gegen Ende eines Trocknungsprozesses in dem Hausgerät (1 ) und zu einem Zeitpunkt, zu dem die Flusen noch feucht sind, durchgeführt wird. 6. The method according to any one of the preceding claims, characterized in that the cleaning towards the end of a drying process in the domestic appliance (1) and at a time when the lint is still wet, is performed.
7. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Spülflüssigkeit von oben in den Wärmetauscher (2) eingeleitet wird und die Lamellen (21 ) des Wärmetauschers (2) umspült.7. The method according to any one of the preceding claims, characterized in that the rinsing liquid is introduced from above into the heat exchanger (2) and the lamellae (21) of the heat exchanger (2) flows around.
8. Hausgerät (1 ) zur Pflege von Wäschestücken , umfassend einem Wärmetauscher (2), ein Prozessluftgebläse (6) zum Treiben eines Luftstroms (4) durch den8. Domestic appliance (1) for the care of laundry items, comprising a heat exchanger (2), a process air blower (6) for driving an air flow (4) through the
Wärmetauscher (2), einen Sammelbehälter (3) für eine Spülflüssigkeit zum Entfernen von während eines Trocknungsprozesses erzeugten Flusen aus dem Wärmetauscher (2), wobei in einer Reinigungsphase die Spülflüssigkeit durch den Wärmetauscher (2) geleitet wird, sowie eine Steuereinrichtung (8) zum Steuern des Reinigens, dadurch gekennzeichnet, dass die Steuereinrichtung (8) derart eingerichtet ist dass während der Reinigungsphase das Prozessluftgebläse (6) zum Treiben des Luftstroms (4) betreibbar ist, wobei die Spülflüssigkeit abhängig von der Stärke des Luftstroms (4) abgelenkt wird und abhängig von der Ablenkung durch verschiedene Bereiche (22, 23) des Wärmetauscher (2) strömt.Heat exchanger (2), a collecting container (3) for a rinsing liquid for removing lint produced during a drying process from the heat exchanger (2), wherein in a cleaning phase, the rinsing liquid is passed through the heat exchanger (2), and a control device (8) for Controlling the cleaning, characterized in that the control device (8) is arranged such that during the cleaning phase, the process air blower (6) for driving the air flow (4) is operable, wherein the flushing liquid is deflected depending on the strength of the air flow (4) and depending on the deflection through different areas (22, 23) of the heat exchanger (2) flows.
9. Hausgerät (1 ) nach Anspruch 8, umfassend eine Leitung (5) mit einem von der Steuereinrichtung (8) steuerbaren Ventil (7), welche Leitung (5) den Sammelbehälter (3) mit dem Wärmetauscher (2) verbindet.9. domestic appliance (1) according to claim 8, comprising a line (5) with one of the control device (8) controllable valve (7), which line (5) connects the collecting container (3) with the heat exchanger (2).
10. Hausgerät (1 ) nach einem der Ansprüche 8 und 9, dadurch gekennzeichnet, dass der Wärmetauscher (2) einer Wärmepumpe (2) des Hausgeräts (1 ) zugeordnet ist. 10. domestic appliance (1) according to any one of claims 8 and 9, characterized in that the heat exchanger (2) is associated with a heat pump (2) of the domestic appliance (1).
1/11.1
Fig.2Fig.2
EP07822851A 2006-12-22 2007-11-23 Method for removing lint from a heat exchanger of a domestic appliance and corresponding domestic appliance Active EP2106474B1 (en)

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PCT/EP2007/062771 WO2008077708A1 (en) 2006-12-22 2007-11-23 Method for removing lint from a heat exchanger of a domestic appliance and corresponding domestic appliance

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