EP2366828B1 - Wäschetrocknermaschine mit verbessertem Kondensatorkühlungssystem - Google Patents

Wäschetrocknermaschine mit verbessertem Kondensatorkühlungssystem Download PDF

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Publication number
EP2366828B1
EP2366828B1 EP10425072.5A EP10425072A EP2366828B1 EP 2366828 B1 EP2366828 B1 EP 2366828B1 EP 10425072 A EP10425072 A EP 10425072A EP 2366828 B1 EP2366828 B1 EP 2366828B1
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EP
European Patent Office
Prior art keywords
condenser
drying air
laundry dryer
exchanger
dryer machine
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.)
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Application number
EP10425072.5A
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English (en)
French (fr)
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EP2366828A1 (de
Inventor
Silvano Fumagalli
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Candy SpA
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Candy SpA
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Publication date
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Priority to EP10425072.5A priority Critical patent/EP2366828B1/de
Publication of EP2366828A1 publication Critical patent/EP2366828A1/de
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Publication of EP2366828B1 publication Critical patent/EP2366828B1/de
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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

Definitions

  • the present invention relates to a rotary-drum laundry dryer, particularly for household use.
  • laundry dryer machines comprising a rotary drum designed to receive the laundry to be dried, means for heating the drying air and a condenser for removing the moisture contained in the drying air at the exit of the rotary drum. These parts are arranged within an outer casing of the household appliance.
  • the machine also comprises a special fan which successively circulates the drying air through the drum, the condenser and the heating means (typically an electrical resistor) during operation of the apparatus.
  • a special fan which successively circulates the drying air through the drum, the condenser and the heating means (typically an electrical resistor) during operation of the apparatus.
  • Prior art machines of this type have a rather high power consumption for each working cycle, due to the power required for driving fans, motors and particularly for the resistor that heats the drying air.
  • the condenser is cooled by air, by means of a special fan that conveys air drawn from the outside environment towards the condenser.
  • This configuration does not always afford a quick and satisfactory condensation of the moisture carried by the drying air at the exit of the drum, and this may involve a relatively slow and inefficient laundry drying process.
  • Document EP-A1-2065510 discloses a washer-dryer comprising a condenser and a water recirculation circuit for cooling the same.
  • the object of the present invention is to provide a laundry dryer machine that is capable of affording effective condensation of the moisture contained in the drying air, and of ensuring a quick and efficient laundry drying process.
  • a further object of the invention is to provide a laundry dryer machine that affords satisfactory energy savings.
  • Another object of the invention is to provide a machine that affords high performances, while maintaining a relatively simple structure and a relatively low cost.
  • a laundry dryer machine comprising:
  • FIGS 1-3 show a laundry dryer machine 11 having an outer casing 12, with a rotary drum 13, a condenser 15 and drying air heating means 14 arranged therein.
  • the rotary drum 13 has a cavity 41 ( Fig. 3 ) for receiving the laundry to be dried, and is rotated, during operation, by known motor means, about a substantially horizontal axis.
  • the drum 13 has a front opening 50 ( Fig. 1 ), through which the laundry may be loaded and unloaded into and from the drying cavity 41.
  • An opening is formed on the front 54 of the casing 12, for the user to access the interior of the drum 13 therethrough ( Fig. 3 ).
  • the opening 25 can be closed by a door, preferably formed as a window 39 hinged to the casing 12 of the household appliance, with a container 32 for collecting condensed water possibly mounted thereto.
  • the heating means 14 have the task of heating the drying air circulating in the household appliance.
  • these means are formed as an electrical resistor 14 disposed on the back of the machine 12, i.e. on the side opposite to the front side 54.
  • the condenser 15 has the task of removing moisture from the drying air at the exit of the drum 13.
  • the condenser 15 is advanatgeously placed under the drum 13.
  • the laundry dryer 11 also comprises conveying means 16 for successively circulating the drying air through the rotary drum 13, the condenser 15 and the heating means 14.
  • These conveying means preferably include a fan 16 placed downstream from the condenser 15 and upstream from the heating means 14.
  • a filtering conduit 26 is interposed between the drying air outlet of the drum 14 (at the lower end of the opening 50) and the inlet to the condenser 15, for the drying air stream to flow therethrough.
  • a collection tank 30 for condensed water is placed downstream from the condenser 15.
  • the water collected in this tank is conveyed towards the collection container 32 via a special pump and a conduit 33 ( Fig. 1 ).
  • the laundry dryer machine 11 also comprises a hydraulic circuit 43-48, in which a liquid for cooling the condenser 15, preferably water, circulates.
  • the hydraulic circuit 43-48 and the condenser 15 form a closed hydraulic circuit.
  • the hydraulic circuit 43-48 comprises an exchanger 43 for cooling the cooling liquid and means 45 for circulating the cooling liquid through the condenser 15 and the exchanger 43.
  • the exchanger 43 is preferably cooled with air.
  • a fan 17 is provided for this purpose, which draws air from outside the machine 11 and causes it to flow through the exchanger 43.
  • the air for cooling the exchanger 43 is admitted through an opening 53 formed in the front face 54 of the casing of the machine ( Fig. 3 ). Then, the air for cooling the exchanger 43 is exhausted from the machine through the bottom opening 49 ( Fig. 3 ).
  • the fan 17 is advantageously placed downstream from the exchanger 43, with respect to the cooling air stream.
  • such fan 17 is rotated by a motor 42 which also has connected thereto the fan 16 for circulating the drying air in the machine ( Fig. 2 ).
  • the exchanger 43 may be advantageously formed as a tube bundle, e.g. a serpentine, for the cooling liquid to flow therein.
  • the hydraulic circuit also comprises a second exchanger 44, located at the drying air outlet of the condenser 15.
  • the second condenser 44 is designed to heat the drying air before reintroduction thereof into the drum 13, by utilizing the heat that the cooling water has stored in the condenser 15. This exchanger 44 is fed with the water that comes from the condenser 15 through the conduit 46.
  • the conduit 46 is fitted with the hydraulic pump 45, which circulates the cooling liquid in the hydraulic circuit.
  • the conduit 47 carries the cooling liquid that comes out of the exchanger 44 to the exchanger 43, where water is cooled with air.
  • conduit 48 carries the cold cooling liquid from the exchanger 43 to the condenser 15.
  • the condenser 15 is preferably formed as a tube bundle with the cooling liquid flowing therein.
  • the flow of cooling liquid is directed countercurrent to the drying air stream in the condenser 15.
  • the temperature of the cooling liquid that comes out of the condenser 15 is higher than the temperature of the drying air that comes out of the condenser. This allows recovery of part of the heat released to the cooling liquid to pre-heat the drying air, before introduction thereof into the drum 13.
  • numeral 63 designates the curve of temperatures T3-T4 of water in the condenser 15 and numeral 62 designates the curve of temperatures t3-t4 of air in the condenser 15.
  • the temperature T3 of water as it enters the condenser 15 preferably ranges from 25°C to 35°C, and is particularly 30°C.
  • the temperature t3 of air as it enters the condenser 15 ranges from 65°C to 75°C, and is advantageously 70°C. Air is relatively hot as it exits the drum, whereas the cooling water is relatively cold as it exits the exchanger 43.
  • the cooling water is heated to a temperature from 60°C to 70°C, preferably about 65°C.
  • the drying air at the exit of the condenser 15 has a temperature from 50°C to 60°C, advantageously about 55°C.
  • numeral 60 designates the curve of temperatures T1-T2 of water in the condenser 44 and numeral 61 designates the curve of temperatures t1-t2 of the drying air in the condenser 44.
  • the temperature T1 of water as it enters the exchanger 44 corresponds to its temperature as it exits the condenser, i.e. from 60°C to 70°C.
  • the temperature t1 of the drying air as it enters the exchanger 44 is equal to its temperature as it exits the condenser, i.e. from 50°C to 60°C.
  • the drying air is preheated before being introduced into the drum 13. This provides energy savings, as the resistor 14 is required to add a smaller amount of heat to the drying air to reach the appropriate operating temperature in the drum 13.
  • the drying air has a temperature t2 from 55°C to 65°C, preferably about 60°C.
  • the cooling water at the exit of the exchanger 44 has a temperature from 53°C to 63°C, preferably about 58°C.
  • a collection tank 52 may be located below the exchanger 43, to collect any condensation water formed in the exchanger 43.
  • the exchanger 43 is located in the proximity of the front wall 54 of the machine casing 12.
  • the exchanger 44 is in such position as to substantially cover the whole extension of the drying air outlet of the condenser 15.
  • the drying air stream in the condenser 15 and the exchanger 44 has a substantially horizontal orientation.
  • the second exchanger 44 might be omitted.
  • Such arrangement is shown in Figure 4 , where the parts that correspond to parts of the first embodiment are designated by the same numerals, increased by 100.
  • the cooling water that comes out of the condenser 115 is directly conveyed through the conduit 147 to the air-cooled exchanger 143.
  • a laundry dryer machine has been provided, which affords effective condensation of moisture contained in the drying air.
  • the laundry drying cycle is thus particularly quick and efficient.
  • the temperature of the drying air as it exits the condenser may be lower than the temperature of the cooling liquid as it exits from the condenser. This provides heat for heating the drying air before reintroduction thereof into the drum.
  • the second heat exchanger 44 allows recovery of part of the heat collected from the cooling liquid in the condenser while condensing the moisture contained in the drying air.
  • the fan that cools the exchanger 43 may be driven by the motor that also rotates the fan for circulating the drying air in the machine.

Landscapes

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

Claims (12)

  1. Wäschetrockner, umfassend:
    - Drehtrommel (13) mit einem Hohlraum (41) zum Aufnehmen der zu trocknenden Wäsche,
    - Heizmittel (14) zur Erwärmung einer Trocknungsluft,
    - ein Kondensator (15) zur Beseitigung von Feuchtigkeit aus der Trocknungsluft,
    - Fördermittel (16) zur anschließenden Zirkulieren der Trocknungsluft durch die Trommel (13), den Kondensator (15) und die Heizmittel (14),
    dadurch gekennzeichnet, dass er einen Hydraulikkreis (43-48) umfasst, der hydraulisch mit dem Kondensator (15) verbunden ist, um einen geschlossenen Hydraulikkreis zu bilden, in dem eine den Kondensator kühlende Kühlflüssigkeit zirkuliert, wobei der Hydraulikkreis (43-48) einen Wärmetauscher (43) zum Kühlen der Kühlflüssigkeit und Mittel (45) zum Zirkulieren der Kühlflüssigkeit durch den Kondensator (15) und den Wärmetauscher (43) umfasst.
  2. Wäschetrockner nach Anspruch 1, dadurch gekennzeichnet, dass im Kondensator (15) der Fluss der Kühlflüssigkeit dem Trocknungsluftstrom entgegengerichtet ist.
  3. Wäschetrockner nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Kondensator (15) als Rohrbündeltauscher gebildet ist, wobei die Kühlflüssigkeit durch die Rohre des Rohrbündeltauschers fließt.
  4. Wäschetrockner nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Wärmetauscher (43) mit Luftmitteln (17) gekühlt ist, die bereitgestellt sind, um die Kühlluft zu veranlassen, in den Wärmetauscher (43) zu strömen.
  5. Wäschetrockner nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Temperatur der aus dem Kondensator (15) austretenden Kühlflüssigkeit höher als die Temperatur der aus dem Kondensator (15) austretenden Trocknungsluft ist.
  6. Wäschetrockner nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Hydraulikkreis (43-48) einen zweiten Wärmetauscher (44) aufweist, der in der Nähe des Trocknungsluftauslasses des Kondensators (15) angeordnet ist, um die Trocknungsluft zu erwärmen, wobei der zweite Wärmetauscher (44) stromabwärts des Kondensators (15) und stromaufwärts des ersten Wärmetauschers (43) in dem Hydraulikkreis (43-48) angeschlossen ist.
  7. Wäschetrockner nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Temperatur der Kühlflüssigkeit von einem Wert von 25 °C - 35 °C beim Einlaufen in den Kondensator (15) auf einen Wert von 60 °C - 70 °C beim Auslaufen aus dem Kondensator (15) wechselt.
  8. Wäschetrockner nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Temperatur der Trocknungsluft von einem Wert von 65 °C - 75 °C beim Einströmen in den Kondensator (15) auf einen Wert von 50 °C - 60 °C beim Ausströmen aus dem Kondensator (15) wechselt.
  9. Wäschetrockner nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass im zweiten Wärmetauscher (44) die Trocknungsluft so erwärmt wird, dass die Temperatur um 5 °C - 15 °C ansteigt.
  10. Wäschetrockner nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Kühlflüssigkeit durch den ersten Wärmetauscher (43) um wenigstens 25 °C abgekühlt wird.
  11. Wäschetrockner nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass er ein erstes Gebläse (17) zum Fördern der Kühlluft zum ersten Wärmetauscher (43) des Hydraulikkreises (43-48) und ein zweites Gebläse (16) zum Zirkulieren der Trocknungsluft im Trockner aufweist, wobei die beiden Gebläse (16, 17) vom gleichen Motor (42) gedreht werden.
  12. Wäschetrockner nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Mittel zum Zirkulieren der Kühlflüssigkeit in dem Hydraulikkreis (43-48) eine Pumpe aufweisen.
EP10425072.5A 2010-03-17 2010-03-17 Wäschetrocknermaschine mit verbessertem Kondensatorkühlungssystem Active EP2366828B1 (de)

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Application Number Priority Date Filing Date Title
EP10425072.5A EP2366828B1 (de) 2010-03-17 2010-03-17 Wäschetrocknermaschine mit verbessertem Kondensatorkühlungssystem

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EP10425072.5A EP2366828B1 (de) 2010-03-17 2010-03-17 Wäschetrocknermaschine mit verbessertem Kondensatorkühlungssystem

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EP2366828A1 EP2366828A1 (de) 2011-09-21
EP2366828B1 true EP2366828B1 (de) 2017-11-15

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11434601B2 (en) 2019-12-20 2022-09-06 Whirlpool Corporation Laundry treating appliance having a condenser

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3192912A1 (de) * 2016-01-14 2017-07-19 BSH Hausgeräte GmbH Wäschetrockner mit einem kühlwasserkreislauf
IT201700044782A1 (it) * 2017-04-24 2018-10-24 Candy Spa Macchina asciuga-biancheria del tipo a condensazione

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100390515B1 (ko) * 2001-09-25 2003-07-04 엘지전자 주식회사 의류 세탁건조기 및 의류 건조기
JP4293114B2 (ja) * 2004-11-09 2009-07-08 パナソニック株式会社 ドラム式洗濯乾燥機
PL2065510T3 (pl) * 2007-11-28 2015-04-30 Candy Spa Maszyna do obchodzenia się z praniem, zwłaszcza pralko-suszarka z obwodem recyrkulacyjnym

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11434601B2 (en) 2019-12-20 2022-09-06 Whirlpool Corporation Laundry treating appliance having a condenser
US11828018B2 (en) 2019-12-20 2023-11-28 Whirlpool Corporation Laundry treating appliance having a condenser

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