EP0731204B1 - A condensation laundry dryer with arrangements for collecting condensation water in a container - Google Patents

A condensation laundry dryer with arrangements for collecting condensation water in a container Download PDF

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Publication number
EP0731204B1
EP0731204B1 EP95202465A EP95202465A EP0731204B1 EP 0731204 B1 EP0731204 B1 EP 0731204B1 EP 95202465 A EP95202465 A EP 95202465A EP 95202465 A EP95202465 A EP 95202465A EP 0731204 B1 EP0731204 B1 EP 0731204B1
Authority
EP
European Patent Office
Prior art keywords
tank
cover
dryer
collecting
laundry dryer
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
EP95202465A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0731204A1 (en
Inventor
Silvano Fumagalli
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.)
Candy SpA
Original Assignee
Candy 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 Candy SpA filed Critical Candy SpA
Publication of EP0731204A1 publication Critical patent/EP0731204A1/en
Application granted granted Critical
Publication of EP0731204B1 publication Critical patent/EP0731204B1/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
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/12—Casings; Tubs
    • D06F39/14—Doors or covers; Securing means therefor
    • 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
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/42—Safety arrangements, e.g. for stopping rotation of the receptacle upon opening of the casing door

Definitions

  • This invention relates to a laundry dryer for household use, being of the top-loading type with arrangements for collecting condensation water in a container.
  • condensation laundry dryers which do not require to be installed close to a water system connection, and which usually have some rinse, cooling or condensation water draining arrangements associated therewith, since steam (not to be released to the environment) is caused to condensate from the drying process therein by a stream of cooling air.
  • Such machines include of necessity a condensate collecting tank whose capacity is at least equal to the volume of condensate produced by one drying cycle when in maximum load conditions and which requires to be emptied periodically, so that it must be provided detachable.
  • the tank is taken out through a front door in the machine by a horizontal sliding movement.
  • a further disadvantage comes from the liquid being possibly spilled out of the condensation water collecting tank housing compartment, open to the front.
  • Front loading laundry dryers have also been provided with the tank placed in the upper area of the machine, inside an open front compartment whence the tank can be slid out. This does make for easier tank handling and water level checking, but is at clash with the consumer's aesthetic demands and cannot provide full protection against overflow and spillage, just as when the tank is installed in the lower area.
  • top loading machines i.e. machines having no front doors
  • machines having no front doors have been proposed which have the tank placed between the machine top cover and the rotating laundry-drying basket (see EP-A-0 484 225).
  • the tank be provided with automatic closure tight fittings for connection to a condensate delivery line.
  • the flat cover must be a significant thickness and formed of an outer cover and inner cover separated by a suitable gap in the 2 to 3 cm range.
  • This volume may amount to a few liters, and represents an unnecessary waste.
  • the present invention obviates all these drawbacks and provides a top loading laundry dryer with collecting tank for the condensation water, wherein the cover top is provided with a housing for a collecting tank to be placed removably into the housing with a flat top surface coplanar with the cover top surface.
  • the housing is provided with two openings in its lower portion to enable the tank to be joined to an intake valving system and an overflow collecting means.
  • the valving system is conveniently constructed to cut off any flow of condensate to the tank if the latter is not there or does not fit properly in its housing.
  • the valving system is mounted in a gutter for catching any overflowing liquid or condensation dewdrops and recirculate them to the condensation circuit, thereby providing double protection against any liquid spill to the machine interior.
  • the gutter is conveniently formed in the handhole bezel with which top loading dryers come inherently equipped.
  • the collecting tank is provided with an internal intake conduit which is open at the top and communicated to the outside at the bottom for its connection to the valving system, and with an internal overflow conduit which also is open at the top and communicated to the outside at the bottom to discharge any overflow into the gutter.
  • the two intake and overflow conduits are disposed near a front wall of the tank, which wall forms a handgrip for pulling the tank out of its housing which is offset from the tank center of gravity under any fill conditions.
  • the tank housing in the cover is closed at the bottom by an inner cover wall having a monotonic downward slope from a rear portion of the machine toward the front thereof and to the overflow and condensate collecting gutter.
  • the drum loading door is provided with a resilient sealing gasket.
  • the tank is provided with a float type of level indicator.
  • FIG. 1 shown therein is an exploded overall perspective view of a laundry dryer embodying the present invention.
  • the dryer is compact in size and comprises a box-type body 1, generally of enamelled sheet metal, in the form of a right parallelepipedon having a depth P, illustratively of 60 cm, height H of 85 cm, and width L of 40 cm.
  • Depth and width refer to the normal conditions of installation and use anticipated.
  • the box-type body 1 is closed at the top by a cover 2, which can be swung open about a hinge 3 located near the rear corner edge of the body, on which a known control and program panel 74 locates.
  • the box-type body conventionally accommodates a cylindrical drum (not shown in the FIgure) rotating about a horizontal axis and being provided on its periphery with an unlockable door made accessible by opening the cover 2, through which laundry is introduced into the rotating drum or basket for drying.
  • the drum illustratively has a diameter such that most of the box-type body inside volume is occupied by the drum which, for easy introduction of the laundry, should be placed with its peripheral top as close as possible to the cover.
  • a rectangular hoousing 4 is formed in the cover thickness which is closed downwardly by an inner cover 27 which extends into the box-type body down to a suitable depth limited by the space requirements of the rotating drum.
  • a collecting tank 5 for the condensation liquid is accommodated removably in the housing 4.
  • the housing 4 and tank 5 are suitably shaped to make best use of the available interior volume of the machine.
  • the tank 5 is suitably provided, near the front wall 6 of the machine body, with a handgrip 51 for removing it and a lens 52 or clear window to view its fill level therethrough.
  • a ventilation grid which allows cooling air for an internal condenser to be drawn in (or even blown out).
  • suction or ejection could take place through the machine bottom, if the latter is raised off the floor on rest feet, but with the inflow and outflow substantially separated from each other.
  • a heat exchanger/steam condenser Provided in the lower portion of the box-type body, not shown in Figure 1, are a heat exchanger/steam condenser, a condensation fluid collecting pan, and motive members for driving rotatively the drum, suction fans and a condensation liquid transfer pump.
  • FIG. 1 shows in block diagram form the construction of the laundry dryer of Figure 1.
  • a stream of heated air is flowed in a closed loop through the drum 31, it being admitted through a side wall 7 or tympan end of the drum and discharged through the opposite wall 8.
  • the heated air vaporizes the liquid with which the laundry is soaked.
  • the stream is induced by a fan 9 which directs the moisture-laden warm air into a heat exchanger/condenser 10.
  • the exchanger is crossed, in counterflow or crossflow relationship, by a stream of cool air, drawn in from the environment, induced by a fan 11, so that the moist warm air is cooled and moisture condensed in the exchanger.
  • the moisture-free cool air is introduced, in closed loop circulation, back into the drum 31 after being heated by electric resistance heaters 12, while the heated condensation air is exhausted to the environment.
  • the condensation liquid which forms in the heat exchanger is discharged to a collecting pan 13, which may be integral with the condenser, and by means of a pump 14 is directed into the collecting tank 5 for the liquid through a safety valve device 53 to be explained.
  • the operation of the laundry dryer is controlled by a programmer 15 which operates the various electric and mechanical members and detects the liquid level in the pan 13 by means of a pressure switch 16 or an equivalent sensor, to cease operation on the occurrence of anomalous conditions, such as the pan 13 becoming overfilled.
  • the inner cover 27 which closes the bottom of the housing 4 for the condensation liquid collecting tank 5 is suitably connected to an overflow and condensation dewdrop collecting pan 17 which discharges any overflow and condensate to the pan 13, preferably under a head where the pan 13 is in communication with the air of the drying circuit, through a drain conduit 18.
  • Figure 3 is a front-to-rear sectional view of the upper portion of the laundry dryer to bring out some of its constructional details.
  • the box-type body 1 is provided at the top with a handhole bezel 19, preferably a plastics moulding, having at its center a rectangular access slip to provide access to the drying drum, with walls which lead funnel-like on four sides to a location close to the outer surface of the drum 31.
  • a handhole bezel 19 preferably a plastics moulding, having at its center a rectangular access slip to provide access to the drying drum, with walls which lead funnel-like on four sides to a location close to the outer surface of the drum 31.
  • the handhole bezel is sunk into the box-type body to form a gutter 20 for collecting overflow from the tank 5.
  • the gutter is provided with a drain port 23 which is connected to the condensation liquid collecting pan by a pipe 24.
  • Hinged to the handhole bezel on the rearward side thereof, is a cover which closes the box-type body top and the access slip formed by the handhole bezel 19.
  • the cover also is a box-type construction formed of a flat top frame or cover 26 of enamelled sheet metal, bounding a rectangular opening, and a bottom wall or inner cover 27 of moulded plastics.
  • the inner cover is not flat but has a central zone which is sunk into the handhole bezel slip 19 and merges with the walls of the latter to form a housing 4, which is rectangular in plan view and open upwardly, for the tank 5 which is inserted thereinto through the cover opening.
  • the bottom wall of the central zone of the inner cover is inclined with a monotonic downward slope from the rear portion to the front portion.
  • the front edge of the cover is completed by a molded plastics grille 21 which is expediently formed with a handle for opening the cover.
  • the drying drum 31 is conventionally provided with a door 41 hinged about a generatrix line 32 of the drum.
  • the door 41 is conventionally provided with an opening handle 33 which also functions as a lock when in the closed position.
  • the door 41 is provided with a resilient lip seal 34 to ensure a substantially tight fit between the door 41 and the drum 31.
  • snap-action holding devices may be suitably arranged to act between tank and the cover without affecting the ease of removal thereof.
  • the tank 5 withdrawal is particularly ergonomic because the tank can be grasped near the front at standard working surface level.
  • the inner cover provides a bearing surface for the rear edge of the tank, which can be raised partially and effortlessly with its front portion and slid on the inner cover with its rear portion such that the tank volume will move toward the front and the operator. In this position, the whole tank can be raised without reach and is extremely facilitated.
  • the sides of the drum mounted for rotation about a center shaft, are perforated near the shaft to admit heated air into the drum and exhaust moisture-laden air from the drum.
  • the drying air delivery and return channels are connected to the drum by means of seals, preferably labyrinth seals, whose fit is less than perfect, so that a minimal volume of relatively moist warm air is let out past the seals.
  • This motion has the pattern shown by arrows 36, when the drum 3 is turning with its top in the direction of arrow 35.
  • this problem is substantially obviated by the inner cover interposed between the tank and the stream of moist air forming an effective thermal insulation shield which allows the inner cover to become heated by the heat transferred by the convective motion of the air inside the slip, with but minimal leakage to the tank.
  • the direct contact of the bottom wall of the inner cover with the tank can be minimized by providing elongate ribs in a front-to-rear direction, for example, either across the wall of the inner cover or the juxtaposed one of the tank, so that an air space is left therebetween which has a thickness on the order of few millimeters and excellent exterior sound as well as thermal insulation can be provided.
  • ribs 75 formed on the inner cover, at the bottom of the housing 4. This largely obviates the formation of condensation water on the wall under the inner cover.
  • Figure 4 shows an exploded perpspective view of an embodiment which achieves the same spacing and interspace formation effect between the inner cover and the tank bottom while enabling the tank 5 capacity to be maximized.
  • the tank 5 is provided with two expansion wings 51, 52 which extend along the tank sides flush with its top wall.
  • the wings are received within the cover thickness and bear on two side guides 53, 54 set in the inner cover.
  • the bottom wall 55 of the tank can be held off the bottom 56 of the housing formed by the inner cover, and the tank capacity be concurrently increased by the volumes of the wings which act as floodplains for tank overfill conditions.
  • Figure 5 is a sectional view in the machine front-to-rear direction of a preferred embodiment of the intake valving system 53 for filling the collecting tank, and shows in greater detail the relative arrangement of the tank, the inner cover, and the handhole bezel.
  • a cylindrical sleeve 22 Formed in the handhole bezel 19, inwards of the collecting gutter 20, is a cylindrical sleeve 22 having an inside shoulder 25 and being coaxial with a cylindrical sleeve 28 which depends from the gutter 20.
  • the sleeve 28 is also provided with an inside shoulder 29.
  • the sleeve 28 receives slidably, axially therein, a tubular element 30 which is closed at its lower end by a plug 35 and extends upwardly into the sleeve 22.
  • the lower end of the tubular element 30 is provided with a resilient sealing gasket 43, such as an O-ring.
  • the tubular element 30 is provided with an outside flange 36 received slidably in the sleeve 22.
  • a compression spring 37 is mounted between the tubular element 30 and the sleeve 22, and acts between the shoulder 25 and the flange 36 to bias the tubular element 30 upwards to a rest position defined by the gasket 43 coming into sealing contact with the shoulder 29.
  • the annular element 30 acts as a closed shut-off valve for a stream of condensation water conveyed into the sleeve 28 through a delivery pipe 38.
  • the tank 5 Located in the housing 4 is the tank 5, which is provided on its interior with a condensation liquid transfer pipe 40 which is aligned axially to the tubular element 30.
  • the pipe 40 has an open top end near the top wall of the tank 5 and flares out at its bottom end into a coupling flange 41 for glued or thermowelded attachment to the bottom wall of the tank 5, as suitably apertured for the insertion of the pipe 40 into the tank.
  • the flange 41 also forms a conical fitting for connection to the top end of the tubular element 30, which may be suitably provided with a sealing gasket 42.
  • the flange 41 will interfere with the upper end of the tubular element 30 and move it a predetermined distance axially downwards against the bias force of the spring 37.
  • the bottom end of the element 30 is provided with radial openings 44 in its peripheral surface which open into the sleeve 28 interior.
  • the tank 5 is provided, additionally to the fill and transfer pipe 40, with an overflow pipe 45, as shown in Figure 6, which also is housed within the tank, with a lower end open into the gutter 20 ( Figure 3) and the upper end open into the tank.
  • the pipe 45 in addition to ensuring a maximum level of fill, provides a compensation vent which prevents the tank 5 from becoming pressurized while being filled or vacuumized while being emptied.
  • the overflow pipe 45 can be disposed in close proximity of a corner edge of the tank.
  • the gutter 20 is also used to advantage for catching any condensation dewdrops formed on the underside of the inner cover 27.
  • the programming device which controls the machine operation should include a startup dead time when the pump 14 is operated and any operation of the pressure switch 16 unrecognized, so that, if the tank 5 has been emptied and/or properly placed in its seat, re-start of the machine and the transfer of excess liquid from the pan 13 by pumping into the tank 5 can be allowed.
  • the overfill or near-so condition of the tank 5 may advantageously be revealed to the user, even before the stop condition occurs, by a level indicator suitably provided in the tank.
  • the liquid level in the tank may be displayed through a clear window formed in the top wall of the tank and perhaps associated with a graduated dipstick inside the tank.
  • the tank 5 is mainly laid flat when in the working condition, the use of a more effective display arrangement is preferable.
  • Figure 7 is a perspective view showing schematically a preferred embodiment of a maximum level indicator for the tank 5.
  • the indicator comprises a plug 60 adhesively attached or thermowelded to the bottom wall 61 of the tank and formed on its interior with a hinge support 62 for a lever 63 which is provided on its end with a buoyant body 64 and a small cylindrically arcuate flag 65 which is facing a clear window 66 formed in the top wall 67 of the tank.
  • the hinge support 62 can be formed directly on the lower half-shell, integral therewith.
  • the fill and overflow pipes 40 and 45 in Figure 6 may also be moulded in with the lower half-shell.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Drying Of Solid Materials (AREA)
EP95202465A 1995-03-09 1995-09-11 A condensation laundry dryer with arrangements for collecting condensation water in a container Expired - Lifetime EP0731204B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI950453 1995-03-09
IT95MI000453A IT1275910B1 (it) 1995-03-09 1995-03-09 Asciugabiancheria a condensazione con recupero di condensa in contenitore

Publications (2)

Publication Number Publication Date
EP0731204A1 EP0731204A1 (en) 1996-09-11
EP0731204B1 true EP0731204B1 (en) 2000-05-24

Family

ID=11370827

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95202465A Expired - Lifetime EP0731204B1 (en) 1995-03-09 1995-09-11 A condensation laundry dryer with arrangements for collecting condensation water in a container

Country Status (3)

Country Link
EP (1) EP0731204B1 (it)
ES (1) ES2148423T3 (it)
IT (1) IT1275910B1 (it)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1925712B2 (en) * 2006-11-24 2017-03-29 Candy S.p.A. Laundry drier with circuit to limit internal condensation
DE102007016074A1 (de) 2007-04-03 2008-10-09 BSH Bosch und Siemens Hausgeräte GmbH Verfahren und Vorrichtung zum Reinigen eines Bauteiles, insbesondere eines Verdampfers einer Kondensatoreinrichtung sowie Wasch- oder Wäschetrockner mit einer solchen Vorrichtung
DE102007049060A1 (de) * 2007-10-12 2009-04-16 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Betreiben einer Spülflüssigkeitseinrichtung in einem Hausgerät zur Pflege von Wäschestücken und Spülflüssigkeitseinrichtung
DE102007049061A1 (de) 2007-10-12 2009-04-16 BSH Bosch und Siemens Hausgeräte GmbH Verfahren und Vorrichtung zum Reinigen eines Bauteiles, insbesondere eines Verdampfers einer Kondensatoreinrichtung sowie Wasch- oder Wäschetrockner mit einer solchen Vorrichtung
KR101467776B1 (ko) * 2008-04-01 2014-12-03 엘지전자 주식회사 의류처리장치 및 의류처리장치의 제어방법
DE102008032800A1 (de) 2008-07-11 2010-01-14 BSH Bosch und Siemens Hausgeräte GmbH Vorrichtung zum Reinigen eines Bauteiles, insbesondere eines Verdampfers einer Kondensatoreinrichtung
DE102009001548A1 (de) 2009-03-13 2010-09-16 BSH Bosch und Siemens Hausgeräte GmbH Wäschetrocknungsgerät mit einem innerhalb eines Prozessluftkreislaufs angeordneten Flusensieb und Verfahren zum Betreiben des Wäschetrocknungsgeräts
DE102011082253A1 (de) * 2011-09-07 2013-03-07 BSH Bosch und Siemens Hausgeräte GmbH Wäschetrocknungsgerät
EP2610395B1 (en) * 2011-12-28 2019-07-03 Electrolux Home Products Corporation N.V. Liquid reservoir for a home appliance having a liquid level indication unit
KR102620364B1 (ko) * 2017-02-23 2024-01-04 삼성전자주식회사 세탁기

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2933513C2 (de) * 1979-08-18 1985-08-08 Miele & Cie GmbH & Co, 4830 Gütersloh Wäschetrockner mit Kondensationseinrichtung
DE3204396C2 (de) * 1982-02-09 1983-12-08 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Haushalt-Wäschetrockner mit einem oben angeordneten Kondensat-Sammelbehälter
IT211139Z2 (it) * 1986-07-25 1989-02-13 Zanussi Elettrodomestici Perfezionamenti alle macchine asciugabiancheria a condensazione.
DE3708516A1 (de) * 1987-03-16 1988-09-29 Bosch Siemens Hausgeraete Ueberlaufsicherung an einem behaelter, vorzugsweise bei einem waeschetrockner
FR2668780B1 (fr) * 1990-11-02 1993-10-22 Ciapem Seche-linge se chargeant par le dessus et equipe d'un bac de recuperation de l'eau de sechage.

Also Published As

Publication number Publication date
ES2148423T3 (es) 2000-10-16
ITMI950453A1 (it) 1996-09-09
EP0731204A1 (en) 1996-09-11
IT1275910B1 (it) 1997-10-24
ITMI950453A0 (it) 1995-03-09

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