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

Definitions

• the present invention relates to a dryer equipped with a heat exchanger system with adjustable condensing power.
• a heat exchanger system is a system for heating or cooling a fluid by means of another fluid which circulates at a different temperature. Such a system is found in various devices, such as a dryer or washer-dryer.
• a heat exchanger system makes it possible, on the one hand, to send a wet and dry air stream on a damp cloth in a drum which removes moisture from this cloth , pu is out of this drum and, before starting a new cycle, goes through a heat exchange device, where the humidity it causes condenses by yielding heat and separates from the air in order to be evacuated and, on the other hand, send into the exchanger device, a cooling fluid, such as fresh air, to cool it and renew its moisture-condensing power.
• a cooling fluid such as fresh air
• the flow of drying air sent through the laundry drum and the heat exchange device, as well as the flow of cooling air of this device d 'heat exchange are usually predetermined rates and not adjustable, regardless of the nature of the wet laundry in the drum.
• German patent application DE-B-2 215 319 there is described an adjustment device for a dryer having a humidity condenser which is responsible for the drying air, which is controlled using a time-dependent switch and / or the temperature and / or humidity for controlling the supply of the cooling fluid to the condenser.
• This document therefore aims to reduce the need for cooling fluid in the condenser, without increasing the drying time.
• the immediate advantage of this arrangement is that it is possible to use cooling water spray nozzles with a relatively large diameter, so as to solve the problem of clogging back small diameter huses used in the prior art.
• this document is essentially limited to making known the possibility of controlling the repeated interruption or the resumption of the supply of the coolant to the condenser, that is to say of controlling the repeated stopping or continuation of the drying process, depending on whether the duration of this process and / or the temperature of the drying air and / or the humidity of the laundry to be dried requires respectively that lo process either stopped or continued.
• EP-A-0 324 653 describes the possibility of using a ventilator comprising rotary vanes inside an enclosure in the form of a scroll or spiral, that is to say in an enclosure in which the clearance existing between the periphery of the pallets and the periphery of the enclosure increases progressive from the inlet to the fan outlet.
• This type of fan has a high efficiency, that is to say a high air flow, when it rotates in one direction and a low air flow when it rotates in the opposite direction.
• this other document proposes the use of a two-flow fan, of the aforementioned type, which - moreover - is considered to be known in the art, it should be noted that it does not in no way evokes the technical effect, that is to say the purpose or the technical function of the aforementioned two-flow fan; moreover, this second document is only intended to be able to use means intended to avoid the overflow of the container with condensation water coming from the cooling of the drying air in the condenser, this aim being achieved using a switch and an elastically pressed pad.
• moisture condensing power d '' a tumble dryer, depending on the type of laundry to be dried, in order to adjust the condensation rate of the humidity which, at each cycle, takes care of the drying air so that this condensation speed is as close as possible, or even equal, to the rate of evaporation of the humidity retained in the damp linen to be dried, of course depending on the nature of the linen.
• the present invention aimed at avoiding the drawbacks of tumble dryers of the prior art, relates to a tumble dryer (or a washer-dryer) whose heat exchanger system has optimum efficiency, in accordance with the requirements mentioned more high.
• the present invention relates to a tumble dryer comprising:
• a device (17; 60) for creating a flow rate of coolant for the condenser characterized in that it also comprises a device (17; 61) for adjusting the rate of condensation of humidity, with which the drying air is charged, depending on the type of damp laundry, such as cotton, silk, wool or synthetic fabric, arranged in the laundry drum (3; 42), that is to say as a function of the rate of evaporation of the moisture retained in the different types of wet laundry to be dried, this device acting by adjusting the flow rate of the condenser cooling fluid, and therefore by adjusting the condensing power of the humidity with which the drying air is charged, and being constituted by said device for creating the drying air flow rate and / or by said device for creating the coolant flow rate of the condenser, which is a rotary device rotating in the two opposite directions of rotation and having at least one different speed of rotation for each of the two directions of rotation.
• the rotary device for adjusting the rate of condensation of humidity which is responsible for the drying air, consists of a mixed device (17), making at the same time a device for creating the drying air flow and the cooling fluid flow, as well as a humidity condenser which is responsible for the drying air, which adjusting device (17) ensures, throughout the duration of the drying process, the equality between the flow rate of the drying air and the flow rate of the cooling fluid, and therefore the equality between the speed of condensation of the humidity, with which the damp laundry is charged, and the rate of evaporation of the moisture retained in the laundry to be dried.
• the rotary device for adjusting the rate of condensation of humidity which is responsible for the drying air, is constituted by a fan (60) comprising a casing (63) and a impeller (61) which is mounted eccentrically in a volute chamber (62) of this casing (63) and which rotates in the two opposite directions of rotation.
• the present invention therefore makes it possible to define a method for drying a damp linen, washed and spun, intended to be placed in a laundry drum (3; 42) of a tumble dryer (1; 40), comprising the steps from:
• a coolant flow rate of a condenser of said humidity (or water vapor) which is responsible for the drying air characterized in that it also comprises, a speed adjustment step condensation of moisture, which is responsible for the drying air, depending on the type of wet laundry, such as cotton, silk, wool or synthetic fabric, placed in the laundry drum (3; 42), that is to say as a function of the rate of evaporation of the humidity retained in the different types of wet linen to be dried, this adjustment step comprising the adjustment of the speed of rotation of a device for creating said flow rate of the fluid cooling of the condenser, and therefore the adjustment of this same flow rate as well as of the condensation power of the humidity with which the drying air is charged.
• FIG. 1 represents a schematic sectional view of a dryer showing a heat exchanger system according to a first example of embodiment
• FIG. 2 represents a schematic top view of a mixed ventilation and heat exchange device for the dryer in FIG. 1,
• FIG. 3 represents a schematic sectional view of a dryer showing a heat exchanger system according to a second embodiment
• FIG. 4 represents a diagrammatic view in section of a ventilation device in the heat exchanger system of the dryer of FIG. 3.
• the invention is applicable to machines, units, installations, designated in brief devices, provided with a heat exchanger system, such as a dryer, a washer-dryer, a laundry drying installation or textiles, products or articles.
• a heat exchanger system such as a dryer, a washer-dryer, a laundry drying installation or textiles, products or articles.
• a dryer comprises a body, a clothes drum rotating inside this body, a device for heating the drying air and a heat exchanger system which includes means for creating, on the one hand, a current of drying air, while sending it to the heating device - in order to raise its temperature to a drying temperature - and then introducing it into the washing drum, to charge with moisture l hot air drying passing through the laundry drum in which is the laundry to be dried, and to pass the air thus charged with moisture on a heat exchange device where the steam (which is charged l (drying air) condenses, giving off heat, and separates from the air in order to be evacuated and allow the air, thus freed of moisture, to follow a new cycle and, on the other hand , simultaneously create a flow of coolant, for example fresh air, to send it to the heat exchange device heated by the heat released by the condensation of humidity and to cool it, thereby regenerating its power to condense moisture.
• a heat exchanger system which includes means for creating, on the one hand, a current of drying air
• a heat exchanger system of this type with optimum efficiency comprises at least one means regulating its action power.
• a heat exchanger system comprises, in obtaining optimum performance, a means regulating its power of condensation of the humidity resulting from this linen, product or article subjected to drying.
• this adjustment is made according to the type of laundry, such as cotton, silk, wool or synthetic fabric for example.
• the condensation power of humidity is a function of the drying air flow and / or the cooling air flow of its heat exchange device.
• the means for adjusting the humidity condensing power is. constituted by one of the means for creating drying and / or cooling air currents of its heat exchange device, adjustable in air flow.
• a ventilation device provided with a fin wheel rotating in the two opposite directions of rotation and comprising fins with a profile chosen from straight, curvilinear, asymmetrical, helical profiles, and . oriented in predetermined directions, generating in the two opposite directions of rotation different air flows, either a ventilation device provided with an envelope (or casing) and a impeller rotating in the two directions of rotation , offset offset in a volute chamber of this envelope
• a dryer 1 comprises a body 2, a washing drum 3 with walls provided with perforations intended the passage of drying air, mounted in rotation on holding rollers 6 and driven in rotation by an electric motor 7 and a heating device 9 intended for heating the laundry and / or the drying air.
• the enclosure of the bodywork 2 comprises two separate spaces, a drying space with a closed drying air circuit 12 and an air cooling space 14.
• the dryer 1 comprises a heat exchanger system 15 comprising a mixed ventilation and heat exchange device 17 which separates the drying space 12 and the cooling space 14.
• This device 17 provides, on the one hand, a sending an air stream upwards and laterally to the right and to the left, through pipes 18 and 19, then into the rotary drum 3 to remove moisture from a wet line therein, a downward suction, through an opening 21, of hot air thus charged with humidity which leaves the rotary drum 3, a flow of this hot air charged with humidity in intimate heat exchange contact with this mixed device ventilation and heat exchange 17, where the moisture condenses by yielding heat and separates from the air, which becomes dry, and a discharge of this dry air again into the pipes 18 and 19 to start a another cycle and, on the other hand, a simultaneous aspiration of the r fresh from the outside environment, through openings 23 and 24, a flow of this fresh air in intimate heat exchange contact with this mixed ventilation and heat exchange device 17, to cool it and thus renew its condensing power moisture, and a discharge of this air through an opening 26
• the mixed ventilation and heat exchange device 17 is produced in the form of a rotating wheel, the projecting circular peripheral edge of which moves freely inside a toric gutter (or groove) 28, which is part of 'a fixed partition 29 of the dryer 1.
• a toric gutter (or groove) 28 which is part of 'a fixed partition 29 of the dryer 1.
• the mixed ventilation and heat exchange device 17 is a means of creating air currents adjustable in air flows.
• the mixed ventilation and heat exchange device 17 is constituted (FIGS. 1 and 2) by a wheel 33 rotating in both directions of rotation and provided, on its two faces, with fins 34 and. 35 having profiles chosen from rectilinear, curvilinear profiles (FIG. 2), asymmetrical, helical and oriented in predetermined directions, generating in the two opposite directions of rotation different predetermined flow rates of drying and cooling air.
• the wheel 33 is driven in rotation in the two opposite directions of rotation, by an electric motor 38.
• the electric motor 38 rotates at the same speed in the two directions of rotation. By changing the direction of rotation of this electric motor, two different flow rates for drying and cooling air are obtained.
• the drying air flow corresponds to an optimal flow for the evaporation of water from a certain type of wet laundry, for example cotton
• the cooling air flow corresponds to an optimal flow for a condensation of the quantity of humidity (or water vapor) removed from this wet cotton linen
• the flow of drying air corresponds to a flow optimal for the evaporation of water from another type of laundry, in particular made of wet synthetic fabric
• the cooling air flow corresponds to an optimal flow for a condensation of the amount of humidity (or steam of water) removed from this damp synthetic cloth.
• the motor 38 for driving the impeller 33 with fins rotates at adjustable speeds in the two opposite directions of rotation.
• this drive motor 38 and at predetermined speeds of rotation it is possible to obtain drying and cooling air flow rates corresponding to optimum flow rates making it possible to achieve optimum efficiency. of the heat exchanger system 15 in drying a large number of types of laundry, such as cotton, synthetic fabric, silk, wool, etc. .
• a dryer 40 comprises a body 41, a laundry drum 42 held in position by two sets of front and rear rollers 43 and rear 44 and driven in rotation by a motor electric 45.
• the laundry drum 42 includes holes or perforations 49 in its side wall and in its front and rear flanges.
• the dryer 40 comprises a heat exchanger system 52 comprising:
• a heat exchange device 55 provided, on its two faces, with two series of fins parallel 56 and 57, whose fins 56 are oriented towards the drum 42 and exposed to the passage of these three air streams Fa, Ff and Fm, while the other fins 57 are oriented in a direction opposite to that of the fins 56 and exposed to the passage of a stream of cooling air, and
• the adjustable flow fan 60 comprises a impeller 61 rotating in the two opposite directions of rotation and mounted eccentrically in a volute chamber 62 of a casing 63. For the same rotation speed, in both directions of rotation of the wheel to fins 61 correspond two cooling air flows.
• the vanes 53 of the laundry drum 42 create drying air streams Fa and Ff, which pass through the heater 54 and then enter the wet laundry drum 42, where they remove the humidity of this damp cloth.
• the two air streams Fa and Ff, hot and charged with humidity leave the drum 42 and participate in the formation of the third air stream Fm.
• These three air currents Fa, Ff and Fm, hot and charged with moisture meet in their path the fins 56 of the heat exchange device 55 and the moisture carried by these currents of air condenses there, gives up heat and separates from the air to be evacuated.
• a current of fresh air is sent by the fan 60 through the fins 57 of the heat exchange device 55 to cool it and renew its power to condense the humidity carried by the air currents Fa, Ff and Fm.
• the action power that is to say the condensation power of the heat exchanger system, is adapted to the nature (cotton or synthetic fabric for example ) damp laundry subjected to drying in the dryer 40.
• the impeller 61 of the fan 60 rotates at adjustable speeds in both directions of rotation.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Detail Structures Of Washing Machines And Dryers (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=9401707

Family Applications (1)

Country Status (3)

Families Citing this family (3)

Family Cites Families (5)

• 1990
  • 1990-10-30 FR FR9013447A patent/FR2668585A1/fr active Granted
• 1991
  • 1991-10-30 EP EP91920490A patent/EP0507931A1/de not_active Withdrawn
  • 1991-10-30 WO PCT/FR1991/000856 patent/WO1992007989A1/fr not_active Application Discontinuation

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events