EP0250870A2 - Combined machine for washing and drying laundry - Google Patents
Combined machine for washing and drying laundry Download PDFInfo
- Publication number
- EP0250870A2 EP0250870A2 EP87107688A EP87107688A EP0250870A2 EP 0250870 A2 EP0250870 A2 EP 0250870A2 EP 87107688 A EP87107688 A EP 87107688A EP 87107688 A EP87107688 A EP 87107688A EP 0250870 A2 EP0250870 A2 EP 0250870A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- laundry
- condenser
- drying
- air
- 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.)
- Withdrawn
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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
- the present invention relates to a combined machine of the domestic type for washing and drying laundry, and is directed in particular to a laundry washing and drying machine of the front-loading type comprising a tub and a drum rotatably mounted therein for containing the laundry during the washing and drying operations.
- Machines of this type are already generally known and usually include a closed circuit for the drying air, in which the air is heated and recirculaetd through the laundry so as to entrain the moisture remaining therein at the end of the washing operation.
- the air thus entraining the moisture is caused to pass through a condenser, in which the air is cooled for precipitating the moisture therefrom, whereupon the air continues its circulation.
- the condenser For enabling it to condense the moisture entrained by the drying air, the condenser is connecetd to an outlet of the water mains.
- the condensate is discharged via the discharge conduit of the machine with the aid of the discharge pump.
- Machines of this type are described for instance in German Patents 2,529,577, 2,806,873, and 2,852,449.
- German Patent Application No. 30 09 954 proposes an improved machine of the above type permitting part of the thermal energy to be recuperated by the use of two countercurrent heat exchangers through which the drying air is successively directed.
- a combined machine of the domestic type for washing and drying laundry comprising a tub with a rotatable drum mounted therein for containing the laundry during the washing and drying operations, a first liquid flow circuit including a discharge pump for discharging the washing liquid from the tub, and a closed drying circuit including a blower for circulating heated air through the laundry and a surface condenser of the air-to-water type supplied via a second liquid flow circuit connected on the one hand to the water mains and on the other, to said discharge pump, the machine being characterized in that said condenser is additionally connected to an open air-cooling circuit comprising a further blower.
- a combined machine for washing and drying laundry according to the invention substantially comprises a housing 1 having a planar top cover 2, an instrument panel 3 carrying various control elements, and a door 4 closing the front wall of the housing.
- housing 1 Contained within housing 1 is a tub 5 provided with a counterweight 6 and connected to housing 1 by a bellows-type seal 7.
- drum 8 Mounted within tub 5 is a drum 8 having a perforate cylindrical peripheral wall internally provided with ribs 9 for entraining the laundry.
- Drum 8 has a front access opening 10 in alignment with a similar opening 11 of tub 5. Openings 10 and 11 are closed by a bulleye-type door 12 hinged on housing 1.
- Drum 8 is adapted to be rotated within tub 5 by the action of an electric motor 13 via a belt transmission 14.
- Tub 5 is formed with a lower opening 15 connected via a conduit 16 to a discharge pump 17 and a discharge conduit 18 for discharging the washing and rinsing liquids at the end of the washing and rinsing operations, respectively.
- the combined machine according to the invention further includes a drying section operable to circulate a current of heated air through the laundry contained in drum 8, so that the moisture contained in the laundry is extracted therefrom and subsequently condensed, the condensate being finally discharged from the machine.
- the machine is provided with a blower 20, electric heater elements 21, and a condenser 22 included in a closed circuit comprising an output conduit 23 from blower 20 to tub 5 and a return conduit 24 from condenser 22 to blower 20.
- Openings 25 are connected to condenser 22 via a conduit 26.
- Condenser 22 is a surface condenser of the air-to-water countercurrent type connected to the water supply mains via a conduit 27 provided with a solenoid valve 28, and on its discharge side to discharge pump 17 through a conduit 29
- a second air circuit comprising an intake conduit 30 for the intake of ambient air, a blower 31 for directing the air towards condenser 22 via a further conduit 32, and a discharge conduit 33 for discharging the air to atmosphere.
- condenser 22 is substantially formed of a circular helical winding of the drying air conduit 26 in surface contact with the cooling air conduit 32.
- the entry points of the two conduits 26 and 32 are disposed at opposite ends of the winding, so that the drying air, as represented by dotted arrows, flows through conduit 26 in a direction opposite to that of the cooling air flow through conduit 32 as represented by solid arrows.
- the drying air conduit 26 has its lower portion suitably provided with ports 36 permitting the condensing water to escape towards conduit 29 (fig. 2).
- the water supply conduit 27 directs a spray jet of cooling water into an end portion of the ascending section of conduit 26 so as to precipitate residual steam from the drying air before the latter enters the return conduit 24 towards blower 20.
- the cooling water subsequently descends by gravity along the walls of conduit 26 towards the lower portion of condenser 22 from where it escapes through conduit 29 towards discharge pump 17.
- condenser 22 is disposed, by way of non-limitative example, on the inner face of the front wall of the housing of the machine, it being evident, however, that it may also occupy other positions within the machine in a modified embodiment of the invention.
- the condenser may thus be positioned in the rear part of the machine, in which case drying air conduit 26 may pass below tub 5.
- the section of the machine for carrying out the drying operation is thus formed as a closed circuit comprising blower 20 and condenser 22.
- the condensation of the moisture within condenser 22 is brought about by means of an open water flow circuit 27 - 29 and an open cooling air circuit 30 - 33.
- Blowers 20 and 31 are advantageously driven by a single motor 34 to thereby simplify and rationalize the construction of the machine.
- the motor 34 for driving the two blowers 20 and 31 is suitably connected to per se known and therefore not described devices for measuring the residual moisture of the laundry to thereby optimize the condensation of the moist air in the course of the drying operation and minimize the operating costs of the machine without resorting to increasing the supply of cooling water or to increasing the output of the heater element.
- connection of motor 34 to the devices for measuring the residual moisture of the laundry permits the rotational speed of blowers 20 and 31 to be varied in such a manner that in a range between predetermined maximum and minimum values of the residual moisture they are rotated at a speed which is inversely proportional to the degree of residual moisture of the laundry as determined in the course of the drying operation.
- This provision permits the operation of condenser 22 to be maintained at its highest level for the entire duration of the drying operation.
- a further advantageous characteristic of the machine according to the invention is the provision of a stiffening collar 35 (fig. 2) inserted into bellows-type seal 7 at the side thereof facing towards tub 5. Collar 35 serves the purpose of ensuring the correct positioning of seal 7 adjacent front opening 10 of the drum.
- seal 7 would be free to shift, permitting the drying air to escape and possibly resulting in undesirable frictional contact between seal 7 and the edge of opening 10 of drum 8.
- the described laundry washing and drying machine is of course provided with all of the operating and control elements , such as a program control unit, thermostats, pressure switches and the like, conventionally employed in machines of this type and therefore not shown and described in detail.
- operating and control elements such as a program control unit, thermostats, pressure switches and the like, conventionally employed in machines of this type and therefore not shown and described in detail.
- the machine according to the invention may of course also be modified regarding for example the arrangement of its functional elements for adaptation to housings of different constructions, without thereby leaving the scope of protection of the described and claimed characteristics.
Abstract
Description
- The present invention relates to a combined machine of the domestic type for washing and drying laundry, and is directed in particular to a laundry washing and drying machine of the front-loading type comprising a tub and a drum rotatably mounted therein for containing the laundry during the washing and drying operations.
- Machines of this type are already generally known and usually include a closed circuit for the drying air, in which the air is heated and recirculaetd through the laundry so as to entrain the moisture remaining therein at the end of the washing operation. The air thus entraining the moisture is caused to pass through a condenser, in which the air is cooled for precipitating the moisture therefrom, whereupon the air continues its circulation.
- For enabling it to condense the moisture entrained by the drying air, the condenser is connecetd to an outlet of the water mains. The condensate is discharged via the discharge conduit of the machine with the aid of the discharge pump. Machines of this type are described for instance in German Patents 2,529,577, 2,806,873, and 2,852,449.
- The main problem encountered with machines of this type derives from the low efficiency of the drying operation and from the demand for excessive amounts of water for increasing the efficiency of the condenser with a view to reducing the duration of a full operating cycle of the machine. The overall result is a considerable consumütion of energy which is in contrast to the official attitude in many countries to encourage the designers of electric household appliances to reduce the overall energy consumption of their products.
- German Patent Application No. 30 09 954 proposes an improved machine of the above type permitting part of the thermal energy to be recuperated by the use of two countercurrent heat exchangers through which the drying air is successively directed.
- The shortcomings of this solution are represented by the highly complicated construction of the machine and by its increased manufacturing costs, which are not compensated by the limited energy saving to be obtaiend thereby.
- It is an object of the present invention to provide a combined machine for washing and drying laundry, including a drying section combining increased efficiency with a simplified construction as required for appliances for domestic use.
- This object is attained in a combined machine of the domestic type for washing and drying laundry, comprising a tub with a rotatable drum mounted therein for containing the laundry during the washing and drying operations, a first liquid flow circuit including a discharge pump for discharging the washing liquid from the tub, and a closed drying circuit including a blower for circulating heated air through the laundry and a surface condenser of the air-to-water type supplied via a second liquid flow circuit connected on the one hand to the water mains and on the other, to said discharge pump, the machine being characterized in that said condenser is additionally connected to an open air-cooling circuit comprising a further blower.
- Further objects and characteristics of the invention will become more clearly evident from the following description, given by way of example with reference to the accompanying drawings, wherein:
- fig. 1 shows a diagrammatic illustration of a machine according to the invention, and
- fig. 2 shows an enlarged illustration of the front part of the machine shown in fig. 1.
- A combined machine for washing and drying laundry according to the invention substantially comprises a housing 1 having a planar
top cover 2, aninstrument panel 3 carrying various control elements, and adoor 4 closing the front wall of the housing. - Contained within housing 1 is a
tub 5 provided with acounterweight 6 and connected to housing 1 by a bellows-type seal 7. - Mounted within
tub 5 is adrum 8 having a perforate cylindrical peripheral wall internally provided withribs 9 for entraining the laundry. -
Drum 8 has a front access opening 10 in alignment with asimilar opening 11 oftub 5.Openings type door 12 hinged on housing 1. -
Drum 8 is adapted to be rotated withintub 5 by the action of anelectric motor 13 via abelt transmission 14. -
Tub 5 is formed with alower opening 15 connected via aconduit 16 to adischarge pump 17 and adischarge conduit 18 for discharging the washing and rinsing liquids at the end of the washing and rinsing operations, respectively. These operations are carried out in the fully conventional manner and, as far as described above with reference to the drawings, the machine does not represent any novelty over prior art as far as the construction and operation of its washing section is concerned. - The combined machine according to the invention further includes a drying section operable to circulate a current of heated air through the laundry contained in
drum 8, so that the moisture contained in the laundry is extracted therefrom and subsequently condensed, the condensate being finally discharged from the machine. - To this purpose the machine is provided with a
blower 20,electric heater elements 21, and acondenser 22 included in a closed circuit comprising anoutput conduit 23 fromblower 20 totub 5 and areturn conduit 24 fromcondenser 22 toblower 20. - The air containing the moisture extracted from the laundry exits from
drum 8 through a plurality ofopenings 25 formed in the lower portion ofdoor 12.Openings 25 are connected tocondenser 22 via aconduit 26. -
Condenser 22 is a surface condenser of the air-to-water countercurrent type connected to the water supply mains via aconduit 27 provided with a solenoid valve 28, and on its discharge side todischarge pump 17 through aconduit 29 - According to the invention, for increasing the efficiency of
condenser 22 there is provided a second air circuit comprising anintake conduit 30 for the intake of ambient air, ablower 31 for directing the air towardscondenser 22 via afurther conduit 32, and adischarge conduit 33 for discharging the air to atmosphere. - According to a preferred embodiment as shown in fig. 2,
condenser 22 is substantially formed of a circular helical winding of the dryingair conduit 26 in surface contact with thecooling air conduit 32. The entry points of the twoconduits conduit 26 in a direction opposite to that of the cooling air flow throughconduit 32 as represented by solid arrows. - The drying
air conduit 26 has its lower portion suitably provided withports 36 permitting the condensing water to escape towards conduit 29 (fig. 2). - The water supply conduit 27 directs a spray jet of cooling water into an end portion of the ascending section of
conduit 26 so as to precipitate residual steam from the drying air before the latter enters thereturn conduit 24 towardsblower 20. The cooling water subsequently descends by gravity along the walls ofconduit 26 towards the lower portion ofcondenser 22 from where it escapes throughconduit 29 towardsdischarge pump 17. - In the embodiment described,
condenser 22 is disposed, by way of non-limitative example, on the inner face of the front wall of the housing of the machine, it being evident, however, that it may also occupy other positions within the machine in a modified embodiment of the invention. - The condenser may thus be positioned in the rear part of the machine, in which case drying
air conduit 26 may pass belowtub 5. - The section of the machine for carrying out the drying operation is thus formed as a closed
circuit comprising blower 20 and condenser 22. The condensation of the moisture withincondenser 22 is brought about by means of an open water flow circuit 27 - 29 and an open cooling air circuit 30 - 33. -
Blowers single motor 34 to thereby simplify and rationalize the construction of the machine. - The
motor 34 for driving the twoblowers - The connection of
motor 34 to the devices for measuring the residual moisture of the laundry permits the rotational speed ofblowers condenser 22 to be maintained at its highest level for the entire duration of the drying operation. - A further advantageous characteristic of the machine according to the invention is the provision of a stiffening collar 35 (fig. 2) inserted into bellows-
type seal 7 at the side thereof facing towardstub 5. Collar 35 serves the purpose of ensuring the correct positioning ofseal 7 adjacent front opening 10 of the drum. - Without the provision of this collar,
seal 7 would be free to shift, permitting the drying air to escape and possibly resulting in undesirable frictional contact betweenseal 7 and the edge of opening 10 ofdrum 8. - The described laundry washing and drying machine is of course provided with all of the operating and control elements , such as a program control unit, thermostats, pressure switches and the like, conventionally employed in machines of this type and therefore not shown and described in detail.
- The machine according to the invention may of course also be modified regarding for example the arrangement of its functional elements for adaptation to housings of different constructions, without thereby leaving the scope of protection of the described and claimed characteristics.
Claims (7)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT45732/86A IT1192085B (en) | 1986-06-26 | 1986-06-26 | COMBINED MACHINE FOR WASHING AND DRYING LINEN |
IT4573286 | 1986-06-26 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0250870A2 true EP0250870A2 (en) | 1988-01-07 |
EP0250870A3 EP0250870A3 (en) | 1988-06-29 |
Family
ID=11257866
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87107688A Withdrawn EP0250870A3 (en) | 1986-06-26 | 1987-05-26 | Combined machine for washing and drying laundry |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0250870A3 (en) |
IT (1) | IT1192085B (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0816549A2 (en) * | 1996-06-26 | 1998-01-07 | CANDY S.p.A. | Domestic washing machine having a closed drying circuit, air condensation of vapour and self cleaning filter |
WO2006062261A1 (en) * | 2004-12-06 | 2006-06-15 | Lg Electronics Inc. | Clothes dryer |
WO2006062262A1 (en) * | 2004-12-06 | 2006-06-15 | Lg Electronics Inc. | Clothes dryer |
KR100774486B1 (en) * | 2006-10-31 | 2007-11-08 | 엘지전자 주식회사 | Clothes dryer |
EP2241663A1 (en) * | 2009-04-15 | 2010-10-20 | Electrolux Home Products Corporation N.V. | Washing-drying machine and method for operating the same |
US8112903B2 (en) * | 2006-02-21 | 2012-02-14 | Electrolux Home Products Corporation N.V. | Household clothes drying machine with additional condenser |
DE102005018044B4 (en) * | 2004-04-19 | 2013-10-10 | Lg Electronics Inc. | Drum washing machine with laundry drying function |
US9828715B2 (en) | 2009-05-28 | 2017-11-28 | Lg Electronics Inc. | Laundry maching having a drying function |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2210522A1 (en) * | 1972-03-02 | 1973-09-06 | Siemens Elektrogeraete Gmbh | LAUNDRY DRYERS |
FR2316369A1 (en) * | 1975-07-02 | 1977-01-28 | Lepper Gmbh Masch App | COMBINED DRUM WASHING AND DRYING DEVICE |
GB2026147A (en) * | 1978-07-20 | 1980-01-30 | Licentia Gmbh | Laundry drier |
GB2082741A (en) * | 1980-07-23 | 1982-03-10 | Bosch Siemens Hausgeraete | Laundry Drier |
GB2151466A (en) * | 1983-12-16 | 1985-07-24 | Bauknecht Hausgeraete | Device for condensing vapour escaping from a vent in a dish washer |
-
1986
- 1986-06-26 IT IT45732/86A patent/IT1192085B/en active
-
1987
- 1987-05-26 EP EP87107688A patent/EP0250870A3/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2210522A1 (en) * | 1972-03-02 | 1973-09-06 | Siemens Elektrogeraete Gmbh | LAUNDRY DRYERS |
FR2316369A1 (en) * | 1975-07-02 | 1977-01-28 | Lepper Gmbh Masch App | COMBINED DRUM WASHING AND DRYING DEVICE |
GB2026147A (en) * | 1978-07-20 | 1980-01-30 | Licentia Gmbh | Laundry drier |
GB2082741A (en) * | 1980-07-23 | 1982-03-10 | Bosch Siemens Hausgeraete | Laundry Drier |
GB2151466A (en) * | 1983-12-16 | 1985-07-24 | Bauknecht Hausgeraete | Device for condensing vapour escaping from a vent in a dish washer |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0816549A3 (en) * | 1996-06-26 | 1998-03-04 | CANDY S.p.A. | Domestic washing machine having a closed drying circuit, air condensation of vapour and self cleaning filter |
EP0816549A2 (en) * | 1996-06-26 | 1998-01-07 | CANDY S.p.A. | Domestic washing machine having a closed drying circuit, air condensation of vapour and self cleaning filter |
DE102005018044B4 (en) * | 2004-04-19 | 2013-10-10 | Lg Electronics Inc. | Drum washing machine with laundry drying function |
DE102005018044C5 (en) * | 2004-04-19 | 2016-01-07 | Lg Electronics Inc. | Drum washing machine with laundry drying function |
DE102005018044B8 (en) * | 2004-04-19 | 2013-12-24 | Lg Electronics Inc. | Drum washing machine with laundry drying function |
WO2006062262A1 (en) * | 2004-12-06 | 2006-06-15 | Lg Electronics Inc. | Clothes dryer |
US7908766B2 (en) | 2004-12-06 | 2011-03-22 | Lg Electronics Inc. | Clothes dryer |
US8826559B2 (en) | 2004-12-06 | 2014-09-09 | Lg Electronics Inc. | Clothes dryer |
US8863400B2 (en) | 2004-12-06 | 2014-10-21 | Lg Electronics Inc. | Clothes dryer |
WO2006062261A1 (en) * | 2004-12-06 | 2006-06-15 | Lg Electronics Inc. | Clothes dryer |
US8112903B2 (en) * | 2006-02-21 | 2012-02-14 | Electrolux Home Products Corporation N.V. | Household clothes drying machine with additional condenser |
KR100774486B1 (en) * | 2006-10-31 | 2007-11-08 | 엘지전자 주식회사 | Clothes dryer |
EP2241663A1 (en) * | 2009-04-15 | 2010-10-20 | Electrolux Home Products Corporation N.V. | Washing-drying machine and method for operating the same |
US9828715B2 (en) | 2009-05-28 | 2017-11-28 | Lg Electronics Inc. | Laundry maching having a drying function |
Also Published As
Publication number | Publication date |
---|---|
IT8645732A0 (en) | 1986-06-26 |
EP0250870A3 (en) | 1988-06-29 |
IT1192085B (en) | 1988-03-31 |
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17Q | First examination report despatched |
Effective date: 19900411 |
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ITF | It: translation for a ep patent filed |
Owner name: RIT.TO ALL'POEB ALLO STATO DI DOMANDA;PROPRIA PROT |
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STAA | Information on the status of an ep patent application or granted ep patent |
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18D | Application deemed to be withdrawn |
Effective date: 19910403 |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: DURAZZANI, PIERO Inventor name: ARREGHINI, LUIGI |