EP0699795B1 - An improved washing/drying machine for laundry - Google Patents

An improved washing/drying machine for laundry Download PDF

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Publication number
EP0699795B1
EP0699795B1 EP95113567A EP95113567A EP0699795B1 EP 0699795 B1 EP0699795 B1 EP 0699795B1 EP 95113567 A EP95113567 A EP 95113567A EP 95113567 A EP95113567 A EP 95113567A EP 0699795 B1 EP0699795 B1 EP 0699795B1
Authority
EP
European Patent Office
Prior art keywords
air
branch
drying machine
fan
washing
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
EP95113567A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0699795A1 (en
Inventor
Piero Durazzani
Marco Casonato
Emanuele Sacconato
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 SpA
Original Assignee
Electrolux Zanussi Elettrodomestici SpA
Electrolux Zanussi 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, Electrolux Zanussi SpA filed Critical Electrolux Zanussi Elettrodomestici SpA
Publication of EP0699795A1 publication Critical patent/EP0699795A1/en
Application granted granted Critical
Publication of EP0699795B1 publication Critical patent/EP0699795B1/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
    • D06F25/00—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry and having further drying means, e.g. using hot air 
    • 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 type of improved combined machine for washing and drying laundry wherein the drying process is performed by condensation of the moisture contained in the hot air blown through laundry, provided with a device that makes the use thereof particularly fast.
  • Document GB-A- 2 248 920 discloses a combined machine for washing and drying laundry as defined in the preamble of claim 1.
  • Washer-dryers are known that function by condensation of a hot air current forced within the drum and removing the moisture contained in the laundry.
  • a ventilation system normally a ventilator constituted by a fan and corresponding electric motor, that circulates the air in a closed circuit through a pipe, heats it and blows it in the drum containing the laundry to be dried.
  • the pipe contains a heating element which, when expediently activated, heats the air touching it forced by the ventilator, so that the air admitted to the drum is hot enough to cause evaporation of moisture contained in the laundry.
  • the hot air thus permeated with moisture is then sucked outside the drum and passed through a condenser generally constituted by a jet of fresh water taken from the mains that creates a cold barrier against which the hot moist air is forced.
  • Laundry drying machines are quite simple, economical and safely working machines but have the well-known disadvantage that their drying cycle is rather slow since it lasts from about 2 hours to about 2.5 hours, depending on the load.
  • the condensing device can normally not be readapted by increasing its section, as would be necessary for maintaining the same suction pressure, since the condenser already has a considerable horizontal section and is placed in the only space actually available, namely in correspondence with a back vertical edge inside the cabinet of the machine.
  • a dryer having a drum being connected with two inlet and two outlet pipes.
  • Each pipe is provided with a fan for circulating the air separately.
  • each pipe has a heating element for heating the circulating air.
  • the suction area of the outlet pipes as well as the position of the inlet pipes are in a radial extension of the drum.
  • the devised solution is based on the finding that, all things being equal, the drying time depends substantially on the flow rate of hot air.
  • readapting the condenser means redimensioning it with a greater section in order to avoid the effect of condensed moisture being sucked in due to the greater speed of the air in the condensation section.
  • the invention consists in having the condensation function performed not by one condenser, as is normally the case, but by a pair of condensers which are substantially alike and disposed within the cabinet of the machine in such a way that the sum of the particular condensation sections is adapted to a greater total flow rate, the condensers having outside dimensions and a shape such that they can be positioned within the machine in two distinct and expedient positions.
  • a machine it comprises tank 1, admission pipe 2, heating resistor 3 for the air passing in pipe 2, two distinct branches for condensation and readmission of air inside the tank which meet in the entrance mouth of pipe 2, the first branch being composed of discharge pipe 4, condenser 5 and suction pipe 6, while the second branch is composed of corresponding discharge pipe 7, condenser 8 and suction pipe 9.
  • Discharge pipe 4 houses motorized ventilator 10 in its interior, while discharge pipe 7 houses corresponding motorized ventilator 11.
  • each branch the fan of the ventilator is normally enclosed in a container known as a "snail" whose shape is such as to utilize the air forced by the fan to direct it with the least loss of efficiency in the pipe leading to the drum.
  • the area of the total condensation section is the sum of single condensation sections A and B relative to the two distinct condensers.
  • the invention thus in fact proposes a virtual condenser having twice the horizontal dimensions of the original condenser but in reality subdivided into two distinct condensers and corresponding ventilation circuits which are disposed in different positions within the machine and therefore do not have the dimensional and housing constraints of the virtual condenser.
  • the result of the invention is exemplified by the following table which illustrates the drying results of a laundry drying machine from current production, model G13 WD 1400W, and of the same machine provided with a device according to the invention and identified as BITURBO 2300W, naturally with all other conditions being equal, in particular the load, constituted by a load of cotton.
  • the table indicates the significant reduction, from 15 to 35 minutes, in the drying cycle time depending on the various load conditions, and also the reduction in the average temperature of the air in the drum which demonstrates that the reduction in drying time is not obtained with an increase in working temperature, which would be undesirable for various reasons well known to the expert, but in fact with a reduction in it.
  • FIG. 4 An advantageous improvement is shown in Fig. 4, where one avoids installing a drive motor for first fan 14; this result can be obtained by utilizing motor 15 of second fan 16 and driving first fan 14 by means of belt 17 and corresponding pulleys that transmit the motion from motor 15 of the second fan to first fan 14.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Confectionery (AREA)
  • Washing And Drying Of Tableware (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
EP95113567A 1994-09-01 1995-08-29 An improved washing/drying machine for laundry Expired - Lifetime EP0699795B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPN940050 1994-09-01
IT94PN000050A IT1267581B1 (it) 1994-09-01 1994-09-01 Macchina lava-asciugabiancheria perfezionata

Publications (2)

Publication Number Publication Date
EP0699795A1 EP0699795A1 (en) 1996-03-06
EP0699795B1 true EP0699795B1 (en) 1998-07-01

Family

ID=11394942

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95113567A Expired - Lifetime EP0699795B1 (en) 1994-09-01 1995-08-29 An improved washing/drying machine for laundry

Country Status (4)

Country Link
EP (1) EP0699795B1 (it)
DE (1) DE69503201T2 (it)
ES (1) ES2120670T3 (it)
IT (1) IT1267581B1 (it)

Families Citing this family (2)

* 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
KR101467769B1 (ko) * 2008-04-01 2014-12-10 엘지전자 주식회사 의류처리장치 및 그 제어방법

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2429078A1 (de) * 1974-03-20 1976-01-08 Hugo Werner Geschka Automatischer waeschetrockner
DE2503569A1 (de) * 1975-01-29 1976-08-05 Hugo Werner Geschka Waeschetrocknungs-verfahren und automatischer waeschetrockner zur durchfuehrung des verfahrens
IT222171Z2 (it) * 1990-10-16 1995-01-24 Zanussi Elettrodomestici Condotto di circolazione dell'aria per macchina asciugatrice di biancheria

Also Published As

Publication number Publication date
EP0699795A1 (en) 1996-03-06
ITPN940050A0 (it) 1994-09-01
ES2120670T3 (es) 1998-11-01
DE69503201D1 (de) 1998-08-06
DE69503201T2 (de) 1999-04-15
IT1267581B1 (it) 1997-02-07
ITPN940050A1 (it) 1996-03-01

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