EP0320966A1 - Heizvorrichtung zum Erwärmen eines Luftstroms, insbesondere für Wäschetrockner mit Trommel - Google Patents

Heizvorrichtung zum Erwärmen eines Luftstroms, insbesondere für Wäschetrockner mit Trommel Download PDF

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Publication number
EP0320966A1
EP0320966A1 EP88121104A EP88121104A EP0320966A1 EP 0320966 A1 EP0320966 A1 EP 0320966A1 EP 88121104 A EP88121104 A EP 88121104A EP 88121104 A EP88121104 A EP 88121104A EP 0320966 A1 EP0320966 A1 EP 0320966A1
Authority
EP
European Patent Office
Prior art keywords
heater unit
air
resistance element
plate
tub
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Withdrawn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
EP88121104A
Other languages
English (en)
French (fr)
Inventor
Sandro Marcer
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.)
IRCA SpA Industria Resistenze Corazzate e Affini
Original Assignee
IRCA SpA Industria Resistenze Corazzate e Affini
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 IRCA SpA Industria Resistenze Corazzate e Affini filed Critical IRCA SpA Industria Resistenze Corazzate e Affini
Publication of EP0320966A1 publication Critical patent/EP0320966A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
    • F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
    • 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 
    • D06F58/26—Heating arrangements, e.g. gas heating equipment
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/48—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material
    • H05B3/50—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material heating conductor arranged in metal tubes, the radiating surface having heat-conducting fins
    • 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
    • D06F2103/52—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to electric heating means, e.g. temperature or voltage
    • 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
    • D06F2105/28—Electric heating

Definitions

  • This invention relates to an air flow heater unit, particularly for tumbler clothes driers.
  • Known tumbler clothes driers comprise an external structure for containing the laundry to be dried, against which a hot air jet is fed. This jet is obtained by passing an air stream through a conveying duct which houses a resistance heater element.
  • this conveying duct is formed from two half-­shells of die-cast aluminium joined together with a silicone gasket therebetween.
  • An armoured resistance element is fixed to one of the two half-shells by a conventional flange so that it is grazed by the air to be heated, the unit formed from the two half-shells being covered externally with a layer of insulating material, generally glass wool, to prevent excessive heating of the parts external to the heater unit, ie the structure of the clothes drier and its operating and control members.
  • the resistance is sprinkled by water which in the following drying phase, that is when the resistance operates in air, oxidizes and rusts thus making dirty the clothes.
  • a further drawback is that the drying effect is essentially due to the thermal irradiation and therefore concerns only the clothes placed on the peripheral zone, and not those placed in the center of the tub.
  • a further drawback is that the need to mount the resistance element inside the aluminium duct means that this element must be provided with a flange and that a certain complication arises in assembly.
  • an air flow heater unit particularly for tumbler clothes driers, comprising at least one electrical resistance element which heats a flow of drying air, characterised in that said electrical resistance element is completely embedded in a body of die-cast aluminium alloy.
  • the heater unit according to the invention consists, in the embodiment shown in Figures 1 to 5, of a tubular duct indicated overall by 1 and connectable in conventional manner to two external air circulation pipes 2 and 3.
  • the tubular duct 1 is constructed of die-cast aluminium alloy and comprises an outer cylindrical casing 4 and an inner cylindrical body 5 which is coaxial to said cylindrical casing 4 and connected to it by three longitudinal ribs 6,7, and comprises a plurality of longitudinal radiant fins 8.
  • Two spiral-armoured resistance elements 9 are embedded in the material of this body and have their terminal portions emerging from the cylindrical casing 4. Those portions of the resistance element 9 which pass through the interspace between the casing 4 and body 5 are embedded in the longitudinal ribs 7.
  • a safety thermostat 10 is applied to a plate 11 positioned in the casing 4 between the two ribs 7, and a control thermostat 12, preferably of the two-control type (normal laundry and delicate laundry) is provided at the exit of the heater unit, again in the casing 4.
  • the described heater unit according to the invention is connected to an external air conveying circuit comprising a fan 13, the inlet pipe 2, for example of plastics material, and the outlet pipe 3, for example of rubber.
  • the resistance elements 9 are powered to heat the body 5, which then heats the air grazing its walls and allows that, around the pipe 3, the air enters into the tub 14, in the central zone of the rotary drum 15.
  • the control thermostat 12 maintains it at this value by continuously opening and closing the power circuit of the resistance elements 9.
  • the safety thermostat 10 acts to prevent the heater unit exceeding the preset maximum allowable temperature.
  • the heater unit according to the invention offers the important advantage of a large heat transfer surface between the tubular element 5 and the air to be heated, so allowing the working temperature of the resistance element 9 to be kept substantially low (about 300°C) with the result that it can be constructed at lower cost, is subjected to only low stress, has high operational reliability and need not necessarily require the heater unit to be externally insulated.
  • a further important advantage obtainable with the heater unit according to the invention is that it is constructed by a single die-casting procedure, and thus pratically without assembly costs and with the possibility of delivering from the factory a product which can be directly installed in the clothes drier.
  • the heater unit according to the invention consists substantially of a die-cast aluminium alloy plate 16 in which the resistance elements 9 are incorporated in its material and have their terminals emerging from one edge of said plate 16.
  • the plate 16 also incorporating the control and safety thermostats, is fixed to two aluminium cover plates 18 by pins 17 suitably clinched at their ends.
  • the heater element is fixed through one plate 18, for example by screws, to a movable portion 19 of the tub 14, which portion substantially forms a swelling of the cylindric wall of the same tub and which is fixed to the tub by screws.
  • the inlet pipe 2 communicates introducing air which, blown by the fan 13, grazes the plate 16, heats and is forced to graze the external wall of the rotary drum 15 and to heat in such a way the laundry placed inside this near the peripheral wall.
  • This embodiment has all the advantages of the preceding unit including the possibility of constructing the heater unit in one die-casting procedure, and also has the important advantage of being very flat and therefore installable in already existing washing-drying machines in which there would not be space for a tubular heater unit.
  • the heater unit substantially comprises a die-cast aluminium thin portion 20, slightly curved according to the curvature of the tub 14 of the clothes washing-drier, and a tubular duct 21 provided outside to said portion 20 and extending in a portion 22 centripetally directed.
  • the heater is fixed with its portion 20, for example by screws, to the movable portion 19 of the tub 14, in such a way as the air which enters into the swelling of the cylindrical wall of the same tub, partly grazes said plate heats, goes and passes through the drilled wall of the rotating drum, partly enters into the duct 21 to graze a plurality of fins 23, and goes out through the curved portion 22 to enter into the drum around its front opening.
  • This embodiment has all the advantages of the preceding units including the possibility of introducing the drying air both on the surface of the clothes placed inside the rotary drum, and on its middle zone, thus ensuring a more effective, quick and complete drying process.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
EP88121104A 1987-12-17 1988-12-16 Heizvorrichtung zum Erwärmen eines Luftstroms, insbesondere für Wäschetrockner mit Trommel Withdrawn EP0320966A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8784183A IT8784183A0 (it) 1987-12-17 1987-12-17 Gruppo scaldante per asciugabiancheria
IT8418387 1987-12-17

Publications (1)

Publication Number Publication Date
EP0320966A1 true EP0320966A1 (de) 1989-06-21

Family

ID=11325030

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88121104A Withdrawn EP0320966A1 (de) 1987-12-17 1988-12-16 Heizvorrichtung zum Erwärmen eines Luftstroms, insbesondere für Wäschetrockner mit Trommel

Country Status (2)

Country Link
EP (1) EP0320966A1 (de)
IT (1) IT8784183A0 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0456173A1 (de) * 1990-05-11 1991-11-13 I.R.C.A. S.P.A. Industria Resistenze Corazzate Ed Affini Heizelement mit gezwungener Luftströmung für Wäschetrockner
EP0582124A1 (de) * 1992-08-05 1994-02-09 PAUL RITZAU PARI-WERK GmbH Zerstäubervorrichtung mit Heizeinrichtung
EP1709369A1 (de) * 2003-08-15 2006-10-11 Inkwell Products, Inc. Kompaktes integriertes zwangslufttrocknungssystem
IT201800010389A1 (it) * 2018-11-16 2020-05-16 Irca Spa Riscaldatore elettrico per elettrodomestico

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2527013A (en) * 1947-10-17 1950-10-24 Bayard L Kjelgaard Infrared heater
US2996594A (en) * 1956-05-18 1961-08-15 Tuttle Electric Products Inc Molded electric heater and method of making same
GB878801A (en) * 1958-02-24 1961-10-04 Easy Washing Machine Company L Improvements in or relating to clothes driers
DE1944939A1 (de) * 1968-09-12 1970-03-19 Zanussi A Spa Industrie Einrichtung zur Lufterwaermung,insbesondere fuer kombinierte Waschmaschinen
FR2214870A1 (de) * 1973-01-23 1974-08-19 Wikstroem Ab Berth
DE3340313A1 (de) * 1983-11-08 1985-05-15 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Haushalt-waeschetrockner

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2527013A (en) * 1947-10-17 1950-10-24 Bayard L Kjelgaard Infrared heater
US2996594A (en) * 1956-05-18 1961-08-15 Tuttle Electric Products Inc Molded electric heater and method of making same
GB878801A (en) * 1958-02-24 1961-10-04 Easy Washing Machine Company L Improvements in or relating to clothes driers
DE1944939A1 (de) * 1968-09-12 1970-03-19 Zanussi A Spa Industrie Einrichtung zur Lufterwaermung,insbesondere fuer kombinierte Waschmaschinen
FR2214870A1 (de) * 1973-01-23 1974-08-19 Wikstroem Ab Berth
DE3340313A1 (de) * 1983-11-08 1985-05-15 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Haushalt-waeschetrockner

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0456173A1 (de) * 1990-05-11 1991-11-13 I.R.C.A. S.P.A. Industria Resistenze Corazzate Ed Affini Heizelement mit gezwungener Luftströmung für Wäschetrockner
TR26541A (tr) * 1990-05-11 1995-03-15 Irca Spa Elbise kurutuculari icin tazyikli bir konveksiyon hava isitici elemani
EP0582124A1 (de) * 1992-08-05 1994-02-09 PAUL RITZAU PARI-WERK GmbH Zerstäubervorrichtung mit Heizeinrichtung
EP1709369A1 (de) * 2003-08-15 2006-10-11 Inkwell Products, Inc. Kompaktes integriertes zwangslufttrocknungssystem
EP1709369B1 (de) * 2003-08-15 2012-04-04 FlexAir, Inc. Kompaktes integriertes zwangslufttrocknungssystem
IT201800010389A1 (it) * 2018-11-16 2020-05-16 Irca Spa Riscaldatore elettrico per elettrodomestico
WO2020100085A1 (en) * 2018-11-16 2020-05-22 I.R.C.A. S.P.A. Industria Resistenze Corazzate E Affini Electric heater for household appliance
CN113302353A (zh) * 2018-11-16 2021-08-24 I.R.C.A.（共同）股份公司工业铠装及类似电阻 用于家用电器的电加热器
CN113302353B (zh) * 2018-11-16 2023-08-29 I.R.C.A.（共同）股份公司工业铠装及类似电阻 用于家用电器的电加热器

Also Published As

Publication number Publication date
IT8784183A0 (it) 1987-12-17

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