EP0466549A1 - Wäschetrockner - Google Patents

Wäschetrockner Download PDF

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Publication number
EP0466549A1
EP0466549A1 EP91401763A EP91401763A EP0466549A1 EP 0466549 A1 EP0466549 A1 EP 0466549A1 EP 91401763 A EP91401763 A EP 91401763A EP 91401763 A EP91401763 A EP 91401763A EP 0466549 A1 EP0466549 A1 EP 0466549A1
Authority
EP
European Patent Office
Prior art keywords
drum
air
dryer according
enclosure
fan
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Withdrawn
Application number
EP91401763A
Other languages
English (en)
French (fr)
Inventor
Christian Burgel
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.)
Compagnie Industrielle dAppareils Menagers SA CIAPEM
Original Assignee
Compagnie Industrielle dAppareils Menagers SA CIAPEM
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 Compagnie Industrielle dAppareils Menagers SA CIAPEM filed Critical Compagnie Industrielle dAppareils Menagers SA CIAPEM
Publication of EP0466549A1 publication Critical patent/EP0466549A1/de
Withdrawn legal-status Critical Current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 
    • D06F58/24—Condensing arrangements
    • 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/08—Humidity
    • 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/28—Air properties
    • D06F2103/36—Flow or velocity
    • 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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/16—Air properties
    • D06F2105/24—Flow or velocity
    • 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
    • D06F58/30—Drying processes 

Definitions

  • the invention relates to a dryer.
  • a dryer usually includes one (or more) electrical resistance (s) associated with a fan to circulate hot air through the laundry to be dried.
  • the hot air accelerates the evaporation of the water contained in the laundry and drives the air charged with steam, either to the outside or to a condenser.
  • Tumble dryer manufacturers usually seek to minimize drying time, energy consumption, manufacturing costs and the noise level generated by the operation of the dryer.
  • the invention significantly reduces in particular the energy consumption and / or the operating time.
  • the invention is characterized in that it includes means so that the air leaving the laundry is constantly saturated with water vapor.
  • the humidity evacuation rate is adjusted to be substantially equal to the evaporation rate.
  • condensation flow rate that is to say the characteristics of the condenser, which is chosen to maintain said saturation of the air leaving the laundry.
  • the dryer is of the mixed type, that is to say that part of the water vapor is condensed inside the appliance and another part of the air saturated with vapor d water is discharged to the outside. Condensation can be performed on a covering wall of the dryer, which minimizes the cost of producing the device and limits heat loss.
  • the surface of the heat exchanger can be minimized, which saves material.
  • the air flow can also be reduced, which allows the use of a fan that is not bulky, of a drive motor that is not very powerful and produces a low level of noise.
  • the total amount of air evacuated by the device is 10 to 15 times less than in known devices.
  • the output flow can therefore be reduced, which is favorable for reducing the operating noise level.
  • the cross section of the exhaust duct can also be reduced.
  • the operating cycle is shorter than in a conventional machine.
  • Diagram 10 of FIG. 1 therefore shows that with a known dryer, the air leaving the laundry is not saturated with humidity, even at the start of operation. A large part of the hot air - that is to say a large part of the energy supplied - is therefore not used for drying.
  • the invention consists in providing the means so that the air leaving the linen is constantly saturated with water vapor.
  • FIG. 2 shows a dryer according to the invention.
  • the device is of the open circuit type, that is to say that it does not have a condenser. Moist air is released into the atmosphere.
  • This dryer comprises a drum 15 rotating around a horizontal axis 16 and containing the laundry 17 with perforated flanges 18 and 19 to allow the drying air to pass.
  • a heating resistor 20 is arranged in the vicinity of the flange 18, outside the drum 15. Similarly, in the vicinity of the perforated flange 19, outside the drum 15, there is a fan 21.
  • the fan 21 and the resistor 20 are located in a duct 22 of large section allowing air to circulate according to the arrows F.
  • the duct 22 In the vicinity of the resistor 20 the duct 22 has an air inlet opening 23 and at the in the vicinity of the fan 21, this same pipe has an opening 24 for discharging moist air.
  • the fan 21 controls the various air flows in the dryer: the main circulation takes place in a closed circuit, that is to say substantially parallel to the axis 16 of the drum inside this last and in the duct 22 outside the drum. In addition, part of the air leaving the drum is evacuated to the outside through the opening 24. The quantity of evacuated air is compensated by a corresponding quantity which penetrates through the opening 23.
  • the air passing through the drum 15, and therefore the linen 17, is heated by the electrical resistance 20.
  • the dimensions of the openings 23 and 24 are such that, according to an arrangement of the invention, the air leaving the drum 15 is saturated with humidity.
  • the opening 24 ensures the evacuation of moisture while the main air flow through the pipe 22 constitutes the means of energy supply making it possible to evaporate the water which is in the linen 17.
  • the main flow is significantly higher than the moisture removal flow.
  • FIG. 3 differs from that described in relation to FIG. 2 by the fact that it includes a heat exchanger 30 for condensing the humidity of the air leaving the drum 15 and that it is devoid of a humidity evacuation opening to the outside.
  • this dryer is identical to that shown in Figure 2 and will therefore not be described in detail.
  • the heat exchanger 30 is constituted by a conduit traversed by a cooling fluid, for example water. It is disposed in the conduit 22, for example halfway between the flanges 18 and 19.
  • the condensed water is collected by a removable tank 31 or connected to a discharge pipe (not shown).
  • the exchanger 30 is calibrated so that the condensation flow rate is equal to the evaporation flow rate of the water impregnating the laundry. In this way the air leaving the drum 15 remains saturated with water vapor.
  • This dryer comprises a drum 40 rotating around a horizontal axis 41, the cylindrical shape with flanges of which at least part 42, 43 is perforated to allow the drying air to pass.
  • This drum 40 is disposed in an enclosure 45 delimited by vertical walls which constitute the covering or external cover of the dryer.
  • the drawing shows the rear wall 46 and the front wall 47.
  • the upper part of the enclosure 45 constitutes the upper wall 48 and the cover 49 the device.
  • the lower wall 50 of the enclosure 45 is disposed above the bearing plane 51 of the apparatus so as to provide a space 52 containing the motor 53 for driving the drum as well as a fan 54 whose role will be explained further.
  • An opening 55 in the wall 50 places the enclosure 45 in communication with the space 52.
  • This lower space 52 has, on a side wall, for example the front wall, an opening 56 for the intake of air sucked in by the fan. 54; this air is led to the enclosure 45 through the opening 55 of the wall 50.
  • the enclosure 45 contains, in addition to the drum 40, a heating resistor 57 in the vicinity of the perforated flange 42 but outside the drum 40, and a fan 58 near the flange 43, also outside the drum 40.
  • a reflector 60 for reflecting towards the inside of the drum 40 the energy radiated towards the rear by the resistor 57.
  • the wall 46 constitutes, in the example, an insulating wall while the front wall 47 is a metal wall on which the moisture condenses.
  • the enclosure 45 does not have a sheath or duct to direct the circulation of air.
  • front wall 47 has at its lower part and in the vicinity of the opening 55 an opening 61 to which is connected a duct 62 for evacuating moisture to the outside.
  • the fan 58 circulates the air in the enclosure 45 according to the arrows F ′: the air saturated with humidity leaving the drum 40 is directed towards the rear wall and it enters the drum by passing through the heating resistor 57.
  • the fan 54 draws the outside air through the opening 56 and discharges it, through the opening 55, from the lower volume 52 towards the enclosure 45 through the opening 55.
  • the resulting flow of air F2 crosses the flow F ′ of humid air and draws part of it outwards via the conduit 62.
  • the power of the fan 54 and the dimensions of the openings 55 and 61 are such that the air leaving the drum 40 remains saturated with water vapor.
  • the flow rate of the fan 58 is between 100 and 120 m3 per hour while the flow rate leaving through the duct 62, which is mainly a function of the power of the fan 54, is of the order of 8 to 9 m3 per hour. .
  • the wall 47 constituting a wall on which the moisture condensation takes place, the thermal losses are limited.
  • FIG. 5 differs from that shown in Figure 4 by the fact that there is provided, in the lower part, in place of the lower wall 50 of the enclosure 45, a rotary heat exchanger 70 of the fin type.
  • the axis of rotation 70 a of the heat exchanger 70 is vertical in the example.
  • This rotary exchanger sucks in, thanks to the fins of its lower face 71, the outside air coming from openings 72, 73 of the lower volume 52.
  • the air from the openings 72, 73 is channeled through a duct 74 towards the central part of the exchanger 70 in volume 52 and the fresh air which has thus been used to lower the temperature of the exchanger plate 70 exits from volume 52 through other openings 74 a .
  • the periphery of the wall 70 for heat exchange cooperates with a fluid seal, for example with a liquid (of water condensed) in a gutter 75 secured to the vertical walls of the dryer frame.
  • the enclosure 45 being practically hermetic, it is necessary to evacuate the water which condenses on the lower part of this enclosure. This is why the gutter 75 is connected to an evacuation conduit 76 opening into a tank 77 for recovering the condensates located in the lower volume 52.
  • the exchange wall 70 with its lower fins for sucking in fresh air and upper heat exchange is such that the condensation carried out on this wall 70 is sufficient to maintain the saturation of the air leaving the drum.
  • the cylindrical surface 80 of the drum 81 is perforated.
  • the flanges 82 and 83 have perforations.
  • an electric heating resistance 84 is provided outside the drum 81.
  • the perforations 85 of the flange 82 are of sufficient dimensions for the heating element 84 to radiate heat directly towards the interior of the drum and therefore to laundry 86 to be dried.
  • a reflector 89 having at its upper part a flange 90 substantially at the same level as the upper edge of the drum 81.
  • a resistor and a reflector are also associated with the opposite flange 83.
  • the sealed enclosure 88 contains a condenser 91.
  • the condenser 91 is dimensioned so that the air leaving the laundry is constantly saturated with water vapor.
  • the heat supplied to the laundry 86 mainly comes from the radiation from the heating resistor 84. It is not only direct radiation through the holes in the flange but also from the radiation from the flange 82 itself heated by the radiation from the resistor 84.
  • the flange 82 transmits its heat by conduction to the laundry 86.
  • the resistor 84 heats the air which rises and is directed by the flange 90 towards the interior of the drum 81.
  • This introduction of hot air into the drum is facilitated by the movements of the linen which expels air through the perforations of the drum 81 and therefore cause an air suction, in particular through the holes in the flange 82.
  • an inlet opening 23 and an outlet opening 24 have been mentioned. It may be noted that the sections of the openings of the flanges 18 and 19 of the drum 15 also intervene so that the evacuation rate or the condensation rate is equal to the evaporation rate of the water contained in the laundry.
  • the permanent saturation of the air leaving the laundry can be obtained by adjusting the flow rate of the air circulation fan in the drum (of course when such a fan is provided).
  • the rotation speed of the drum and the flow rate of the fluid in the condenser can also be adjusted.
EP91401763A 1990-07-10 1991-06-27 Wäschetrockner Withdrawn EP0466549A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR909008754A FR2664626B1 (fr) 1990-07-10 1990-07-10 Seche-linge.
FR9008754 1990-07-10

Publications (1)

Publication Number Publication Date
EP0466549A1 true EP0466549A1 (de) 1992-01-15

Family

ID=9398547

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91401763A Withdrawn EP0466549A1 (de) 1990-07-10 1991-06-27 Wäschetrockner

Country Status (2)

Country Link
EP (1) EP0466549A1 (de)
FR (1) FR2664626B1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2500138A1 (fr) * 1981-02-13 1982-08-20 Perlino Antonio Sechoir, en particulier sechoir a linge
FR2605337A1 (fr) * 1986-10-20 1988-04-22 Ciapem Appareil a tambour rotatif sechant du linge par circulation d'air.
EP0341497A1 (de) * 1988-05-07 1989-11-15 Sanyo Electric Co., Ltd. Wäschetrockner

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2500138A1 (fr) * 1981-02-13 1982-08-20 Perlino Antonio Sechoir, en particulier sechoir a linge
FR2605337A1 (fr) * 1986-10-20 1988-04-22 Ciapem Appareil a tambour rotatif sechant du linge par circulation d'air.
EP0341497A1 (de) * 1988-05-07 1989-11-15 Sanyo Electric Co., Ltd. Wäschetrockner

Also Published As

Publication number Publication date
FR2664626B1 (fr) 1994-07-29
FR2664626A1 (fr) 1992-01-17

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