EP0575759B1 - Energy-saving clothes drier - Google Patents

Energy-saving clothes drier Download PDF

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Publication number
EP0575759B1
EP0575759B1 EP93108334A EP93108334A EP0575759B1 EP 0575759 B1 EP0575759 B1 EP 0575759B1 EP 93108334 A EP93108334 A EP 93108334A EP 93108334 A EP93108334 A EP 93108334A EP 0575759 B1 EP0575759 B1 EP 0575759B1
Authority
EP
European Patent Office
Prior art keywords
air
blower
drum
clothes
drying 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.)
Expired - Lifetime
Application number
EP93108334A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0575759A1 (en
Inventor
Piero Durazzani
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.)
Electrolux Zanussi Elettrodomestici SpA
Original Assignee
Electrolux Zanussi Elettrodomestici SpA
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 Electrolux Zanussi Elettrodomestici SpA filed Critical Electrolux Zanussi Elettrodomestici SpA
Publication of EP0575759A1 publication Critical patent/EP0575759A1/en
Application granted granted Critical
Publication of EP0575759B1 publication Critical patent/EP0575759B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

  • This invention relates to a condenser-type clothes drying machine, in which the "cool" condensation medium is room-temperature air itself.
  • Such a clothes drying machine is provided with a rotating drum holding the clothes to be dried, ie. the drying load.
  • Said air is usually taken in from the outside ambient through appropriate conduits and, after having being circulated inside the drum, where it absorbs moisture from the clothes, it is blown outside the same drum through further appropriately provided conduits that convey said hot, moist air to impinge against and flow along a cool wall located inside the same appliance. Upon contacting said cool wall, the moisture contained in the hot air is caused to condense on the same wall, from which it is then collected and removed with the use of various means and methods which are known in the art (see by example FR.A-2 539 153).
  • the air which is at the same time also cooled down by the same cool wall, is conveyed back into the conduits leading to the actual drying process for recirculation, by the action of the blower, through the heating element and the rotating drum holding the clothes to be dried.
  • condenser-type clothes driers generally use the same air to complete a drying cycle, by recirculating it in a closed-loop pattern.
  • these appliances generally use a considerable amount of energy, which may also exceed the one typically demanded by the simpler exhaust-type machines where the hot air is simply exhausted into the ambient after circulation through the drum, owing to the fact that they have to heat up a considerable mass of air which still contains some residual moisture that escaped condensation, and which therefore requires a large amount of energy in order to be heated up to the final temperature needed to effectively subtract moisture from the items to be dried.
  • a cold-air condenser-type clothes drying machine comprising a rotating drum adapted to hold the moist clothes to be dried, said drum being crossed by the forced flow of drying air heated up by at least a heating element and blown therethrough by at least a blower, and in which the hot, moist air leaving said drum is conveyed so as to cause it to impinge against and flow along a cool wall, thereby at the same time causing the moisture contained in the same exhaust air to condense on that wall.
  • the clothes drying machine in question is characterized in that the condensation element is in this case a fixed, substantially cylindrical envelope surrounding the whole outer wall of the drum at a short distance therefrom; that such a condensation envelope has a plurality of axially extending ribs arranged all along its surface; and that the drier itself can be operated according to two distinct modes, ie.
  • the clothes drying machine comprises an outer casing 1 enclosing a rotating drum 2 adapted to contain the moist clothes to be dried and rotatably driven by means of a per se known drive motor (not shown).
  • the outer surface of the drum is wrapped all around by a cylindrically shaped, stationary envelope 3, which constitutes the condensation surface and has all along its generating line a plurality of ribs or grooves 4 extending axially, ie. parallelly to the axis of the cylindrical envelope-condenser 3.
  • a blower 5 takes in the air and blows it through a conduit 6 to a heating element 7 and from here, continuing along the same conduit 6, into the drum 2 through the inlet opening 17. After having flowed across the drum loaded with damp clothes, and having absorbed part of the moisture from the same clothes, the thus humidified air flows out of the drum through a second opening 8 and is conveyed into the gap 9 formed between the outer surface of the drum and the ribbed or grooved surface of the surrounding envelope 3.
  • the water from said condensation process is conveyed by the same ribs or grooves toward a condensate well (not shown), in which it is collected throughout the drying process and from which it is periodically emptied in any appropriate way.
  • the cooling down of the condensation envelope 3, as requested so as to maintain a certain difference between its temperature and the temperature of the hot, damp air flowing out of the drum, and therefore to enable the moisture contained in the same air to effectively condense, is brought about by taking in fresh air from the outside of the machine and conveying it through an appropriate conduit 10 into a second gap 11 formed by the outer surface of said envelope 3 and a second envelope 12 that surrounds said condensation envelope 3 by substantially wrapping it all over its surface.
  • Said cooling air flows then through a separate conduit 13 to reach a second suction blower 14 that forces it through and exhausts it then outside through the afore mentioned two-way arrangement 15 acting as a flow diverter.
  • the clothes drier In a first mode of operation, to be switched on when the machine is operated in a closed room and, therefore, particularly suitable for use in winter time or under prevailing conditions of cold weather, the clothes drier operates in the above described way.
  • the advantages of this mode of operation lie in the fact that the appliance actually operates as a real condenser-type drier, ie. ensuring full condensation so that no moisture is vented outside the machine, thus avoiding what would undoubtedly turn out to be a nuisance in winter, when living spaces and rooms in the house usually have their doors and windows shut, thereby causing moisture to stagnate with the well-known damaging effects on both people and properties.
  • the ambient temperature of the air taken in from outside through the conduit 10 is typically at moderately high values in summer.
  • the air itself is then additionally heated up by the outer surface of the envelope 3 during the condensation phase. It therefore is already at a rather high temperature when it is caused to pass through the heating element 7, so that it will be brought up to the required drying temperature more quickly with a beneficial energy saving effect.
  • a further feature connected with this particular mode of operation lies in the fact that the drying air, after the condensation process, which however leaves it with a part of its moisture contents, is vented outside. It will in any case be immediately appreciated that, if this mode of operation is switched on when the room in which the clothes drier is installed has its windows open, that is in summer or under prevailing conditions of mild weather, such a venting is far from being a nuisance, since moisture is spontaneously and quickly eliminated through the open windows.
  • said second mode of operation to be typically used in summer or under mild weather conditions, is modified by switching on also the blower 14, while at the same time de-energizing the heating element 7, and taking care of arranging the motors driving both blowers 14 and 5 so as to have them flushed by the respective flow of air generated by the same blowers, it ensues that the temperature of the air, while no longer raised by the heating element 7, does not even fall, as opposed to what may actually be assumed, and is kept on average at a value of approx. 40°C, as it has been possible to find out and demonstrate experimentally, owing to the heat wasted by the above mentioned driving motors of the two blowers, said waste heat being in fact fully taken up by the circulating air.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
EP93108334A 1992-06-22 1993-05-24 Energy-saving clothes drier Expired - Lifetime EP0575759B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPN920049 1992-06-22
ITPN920049A IT1259216B (it) 1992-06-22 1992-06-22 Macchina asciugabiancheria con risparmio energetico

Publications (2)

Publication Number Publication Date
EP0575759A1 EP0575759A1 (en) 1993-12-29
EP0575759B1 true EP0575759B1 (en) 1996-08-14

Family

ID=11394689

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93108334A Expired - Lifetime EP0575759B1 (en) 1992-06-22 1993-05-24 Energy-saving clothes drier

Country Status (3)

Country Link
EP (1) EP0575759B1 (it)
DE (1) DE69303990T2 (it)
IT (1) IT1259216B (it)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE428015T1 (de) * 2006-02-21 2009-04-15 Electrolux Home Prod Corp Haushaltswaschetrockner mit einem zusatzlichen kondensator
JP2011244979A (ja) * 2010-05-26 2011-12-08 Panasonic Corp 衣類乾燥機
CN104674531B (zh) * 2013-11-27 2018-10-12 青岛海尔滚筒洗衣机有限公司 一种气体转换装置以及洗干一体机

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2539153B1 (fr) * 1983-01-07 1985-07-12 Thomson Brandt Procede de sechage du linge et seche-linge mettant en oeuvre un tel procede
DE3419743C2 (de) * 1984-05-26 1993-10-21 Miele & Cie Trommeltrockner für Wäsche

Also Published As

Publication number Publication date
EP0575759A1 (en) 1993-12-29
ITPN920049A0 (it) 1992-06-22
DE69303990T2 (de) 1997-01-02
DE69303990D1 (de) 1996-09-19
IT1259216B (it) 1996-03-11
ITPN920049A1 (it) 1993-12-22

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