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)
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
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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)

Description

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.
They are known to be realized by installing 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.
Due to the temperature difference the moisture present in the circulating air is condensed, and the condensate is emitted to the bottom of the tank from where it is easily eliminated.
All this is well-known in the art and is recalled for the sole purpose of facilitating comprehension of the peculiarities of the present patent.
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.
Furthermore they are quite noisy due to the air current forced at a considerable flow rate within the suction and discharge pipes.
Consequently, the utilization of these machines is normally limited to certain periods of the day, which makes their use less interesting for average users.
To reduce drying time it would be necessary to increase the characteristics of all the heating, ventilating and condensing means; this is naturally possible without any great difficulty when it comes to the heating resistor and ventilator; but 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.
On the other hand one cannot avoid suitably increasing the section of the condenser in accordance with the greater flow rate of the ventilator, since if the condensation section was not correspondingly increased there would be such a high speed of air in suction that the film of condensed moisture, instead of dropping to the bottom of the condenser and from there into the tank, would be sucked in again by the ventilator and put back into circulation.
Moreover, a possible increase in speed and thus in air flow rate would increase the noise.
To reduce this noise it would be necessary to reduce the air flow rate, but this would require the drive motor for the fan to be able to turn at different speeds, particularly at reduced speed.
This is naturally possible but in this case one would have to use multispeed motors, which can be realized either by mechanical means or by suitable motors but at the price of greater constructional and functional complexity and with a substantial increase in cost; but the greatest disadvantage of this solution lies in the fact that if the machine is operated at reduced speed this slows down operation again, thereby worsening the service of the machine.
Regarding a conventional dryer FR-A-2 264 908 discloses 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. As both pipes are circulated 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.
It would therefore be desirable, and is the object of the present invention, to realize a machine for washing and drying laundry that is able to offer substantially faster drying performance without any need to redesign the entire structure of the machine and while maintaining the capacity of the drum and the tank and keeping the outer dimensions of the machine within standard values.
These objects are achieved with the invention which will be better understood from the following description, intended only by way of a nonrestrictive example, and as described in the adjoined claims and with reference to the following drawings in which:
Fig. 1
shows a symbolic diagram of the ventilating, condensing and drying pipes of a machine according to the invention,
Fig. 2
shows a front vertical projection of the inside components of a machine according to the invention,
Fig. 3
shows symbolically a vertical side projection of a machine according to the invention,
Fig. 4
shows a horizontal plan drawing of the upper portion of a machine according to an improvement of the invention.
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.
To increase this flow rate one would have to expediently oversize and recalibrate the components constituting the drying circuit, in particular the power of the ventilator, the power of the heating resistor and the condenser.
For the first two components there are no special problems while, as mentioned above, 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.
However it is normally impossible to redimension the condenser for lack of space.
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.
With reference to the figures one can see the inside of a machine according to the invention: 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.
In 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.
It can be easily seen from Fig. 3 that, on the normally true assumption that the tank is disposed in a symmetric position on the horizontal plane with respect to the cabinet of the washer-dryer, 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.
BITURBO 2300W G13 WD 1400W
3 kg 2.75 3.5 4 3 kg 2.75 3.5 4
1 sheet kg kg kg 1 sheet kg kg kg
Time 60' 55' 85' 100' 80' 70' 115' 135'
T°C 137° 131° 149° 168° 160° 160° 171° 173°
Air drum
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.

Claims (6)

  1. A combined washing-drying machine for laundry comprising a cabinet, a tank (1) containing the laundry to be washed and dried, an admission pipe (2), a first branch for circulating, condensing and heating the air taken from a first suction area (6) disposed on the wall of the tank and forced into a first discharge pipe (4) within the cabinet, the first branch comprising a first motorized fan (10), at least one resistor (3) for heating the air circulating within the first branch and a first device (5) for condensing the moisture of the air circulating in the first branch characterized in that a second air circulating branch is provided which is adapted to take the air from inside the drum from a second suction area (9) disposed on the wall of the tank and forced into a second discharge pipe (7) within the cabinet and the second branch containing a second device (8) for condensing the air moisture and a second fan (11) for circulating the air in the second branch and the first and second branches being connected with each other at the entrance mouth of the admission pipe (2) upstream the heating resistor (3) and the admission pipe (2) is arranged at its one end at the axial end of the drum.
  2. Washing-drying machine according to claim 1, characterized in that the rotation axis of the two fans (10, 11) is vertical.
  3. Washing-drying machine according to one of the preceeding claims, characterized in that the second condensing device (8) and the second air circulating fan (11) in the second pipe can be selectively deactivated.
  4. Washing-drying machine according to one of the preceeding claims, characterized in that when the second condensing device (8) and the second circulating fan (11) are deactivated the electric power dissipated by the heating resistor (3) is automatically reduced to approximately one half its value with both fans (10, 11) switched on.
  5. Washing-drying machine according to one of the preceeding claims, characterized in that the second fan (11) is selectively drivable by the same motor as the first fan via a motion transmission means (17).
  6. Washing-drying machine according to one of the preceeding claims and of the front-loading type, characterized in that the first (5) and second (8) condensing devices are respectively disposed along the two back vertical edges of the cabinet of the machine.
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
IT94PN000050A IT1267581B1 (en) 1994-09-01 1994-09-01 PERFECTED WASH-DRYER MACHINE
ITPN940050 1994-09-01

Publications (2)

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

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ID=11394942

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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

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

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL1820893T3 (en) 2006-02-21 2009-09-30 Electrolux Home Products Corp Nv Household clothes drying machine with additional condenser
KR101467769B1 (en) * 2008-04-01 2014-12-10 엘지전자 주식회사 Cloth treating apparatus and Controlling method thereof

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2429078A1 (en) * 1974-03-20 1976-01-08 Hugo Werner Geschka Clothes drier with horizontal-axis rotary perforated drum - preventing air from circulating around drum, without causing creases
DE2503569A1 (en) * 1975-01-29 1976-08-05 Hugo Werner Geschka Automatic tumbler drier with water cooling - with smaller lower-pressure blowers and requiring less space
IT222171Z2 (en) * 1990-10-16 1995-01-24 Zanussi Elettrodomestici AIR CIRCULATION DUCT FOR LINEN DRYING MACHINE

Also Published As

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

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