EP0456173A1 - Elément de chauffage d'air forcé pour sèche-linges - Google Patents

Elément de chauffage d'air forcé pour sèche-linges Download PDF

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Publication number
EP0456173A1
EP0456173A1 EP91107370A EP91107370A EP0456173A1 EP 0456173 A1 EP0456173 A1 EP 0456173A1 EP 91107370 A EP91107370 A EP 91107370A EP 91107370 A EP91107370 A EP 91107370A EP 0456173 A1 EP0456173 A1 EP 0456173A1
Authority
EP
European Patent Office
Prior art keywords
casing
heater element
radiator
air
heated
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Withdrawn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
EP91107370A
Other languages
German (de)
English (en)
Inventor
Roberto Colombo
Duilio Capraro
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 Ed Affini
IRCA SpA Industria Resistenze Corazzate e Affini
Original Assignee
Irca SpA Industria Resistenze Corazzate Ed Affini
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 Ed Affini, IRCA SpA Industria Resistenze Corazzate e Affini filed Critical Irca SpA Industria Resistenze Corazzate Ed Affini
Publication of EP0456173A1 publication Critical patent/EP0456173A1/fr
Withdrawn legal-status Critical Current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

Definitions

  • This invention relates to a forced-convection air heater element for clothes dryers.
  • Known clothes dryers comprise an external cabinet for containing the clothes to be dried by a hot air jet. This jet is obtained by passing an air stream through a feed duct containing a resistance heater element.
  • EP-A-O 320 966 describes a heater unit comprising one or more resistance elements completely embedded in a diecast aluminium block, preferably provided with radiant fins which are grazed by the air stream to be heated.
  • This known heater unit has proved satisfactory in that it offers a large heat transfer surface enabling a good heating effect to be obtained for a small overall size, and can moreover be produced in a single diecasting process.
  • the metal continuity between the electrical resistance element and the diecast alloy necessary to support the radiant element means that the cabinet to which the heater element is fixed reaches a high temperature.
  • the present invention provides a heater unit for air flows which is thermally insulated towards the outside and thus allows high-temperature operation, with a correspondingly reduced overall size.
  • the heater element according to the invention comprises a metal box casing 1 of essentially parallelepiped shape, with a perimetral wall 2 and two covers 3, 3'.
  • a perimetral wall 2 In said perimetral wall 2 there are two apertures 4 and 5 for air entry and exit respectively, and provided with connection pieces 6 for connection to external ducts (not shown).
  • armoured resistance elements 7 arranged parallel to each other and inclined to the larger sides 8 of said wall.
  • the two resistance elements, the ends of which pass through the minor sides 9 of the wall 2 are traditional armoured resistance elements, ie provided with an outer sheath 10 and a coaxial resistor 11 insulated from said sheath by a dielectric.
  • a multiple radiator 13 is fitted to the two resistance elements 7, it consisting of a plurality of parallel zig-zag fins 14 of height slightly less than the wall 2.
  • the two resistance elements 7 are placed in a mould with a cavity corresponding to the radiator 13 and the perimetral wall 2, and once enclosed within this mould a molten aluminium alloy is injected into the mould to form the diecast radiator incorporating the two resistance elements 7, and the perimetral wall 2, which is joined to said radiator by a plurality of feedheads. These are then removed by conventional methods during finishing, so that at the end of the process the radiator applied to the resistance element is joined to the perimetral wall 2 only at the ends of resistance elements.
  • the high temperature of the electrical resistance element 7 produces a substantially lower temperature at the casing 1, which is also kept continually cooled by the passage of air to be heated.
  • the air stream to be heated transverses the armoured resistance element 7 transversely, thus encountering a large flow cross-section.
  • the resultant low pressure drop means that the radiator 13 can be formed with a large number of fins 14 and hence with a large heat transfer surface, which itself means that the working temperature of the resistance elements remains very high, enabling the overall dimensions of the entire heater element to be reduced for equal transmitted thermal energy.
  • this side is covered at the inside with a metal sheet screen 15 extending along the whole length of the side 8.
  • this covering screen 16 can be realized in diecast aluminium during the same moulding step when the radiator and the casing are prepared (see fig. 16).
  • baffle 17 is foreseen, bound to the ends of the radiator 13 and obtained during the same moulding step thereof.
  • a plurality of little cylinders 19 are fitted to the support 12 of the resistance elements 7, even made of diecast aluminium, which forms a "devious" run for the air which transverses the resistance elements 7.
  • This embodiment allows to reduce the constructional costs thank to the lesser quantity of aluminium used, even increasing the heat exchange.
  • the resistance elements 7 are parallel each other to and are embedded in a radiator formed by a plate 20 and a plurality of longitudinal vertical ribs 21, placed under and on the plate 20.
  • This plate 20 divides the casing 1 into two superimposed zones 22,22', respectively communicating with the entry aperture 4 and the exit aperture 5.
  • the plate 20 is provided with a plurality of apertures 23 for the passage of the air to be heated. Also in this embodiment the lower surface of the casing which in struck by the heated air is covered with a metal sheet plate.

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)
  • Thermotherapy And Cooling Therapy Devices (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
EP91107370A 1990-05-11 1991-05-07 Elément de chauffage d'air forcé pour sèche-linges Withdrawn EP0456173A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8412890 1990-05-11
IT84128A IT1239248B (it) 1990-05-11 1990-05-11 Elemento scaldante d'aria in convezione forzata particolarmente per asciugabiancheria

Publications (1)

Publication Number Publication Date
EP0456173A1 true EP0456173A1 (fr) 1991-11-13

Family

ID=11324447

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91107370A Withdrawn EP0456173A1 (fr) 1990-05-11 1991-05-07 Elément de chauffage d'air forcé pour sèche-linges

Country Status (3)

Country Link
EP (1) EP0456173A1 (fr)
IT (1) IT1239248B (fr)
TR (1) TR26541A (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0813030A1 (fr) * 1996-06-10 1997-12-17 EWT Elektrogeräte GmbH & Co. KG Appareil contrÔleur de formation de givre
EP1067822A1 (fr) * 1999-07-09 2001-01-10 Muller & Cie Société Anonyme Procédé de fabrication d'élément chauffant pour appareil de chauffage ou cuisson, élément chauffant ainsi obtenu et appareils ainsi équipés
US6941680B1 (en) * 2003-07-03 2005-09-13 Robert Zielewicz Cost-efficient clothes dryer
EP1643804A1 (fr) * 2004-09-29 2006-04-05 Leister Process Technologies Réchauffeur d'air
EP1709369A1 (fr) * 2003-08-15 2006-10-11 Inkwell Products, Inc. Systeme de sechage integre a air force
JP2015149174A (ja) * 2014-02-06 2015-08-20 京セラ株式会社 ヒータ

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1944939A1 (de) * 1968-09-12 1970-03-19 Zanussi A Spa Industrie Einrichtung zur Lufterwaermung,insbesondere fuer kombinierte Waschmaschinen
US3870860A (en) * 1973-03-15 1975-03-11 Emerson Electric Co Floor drop-in forced circulation electric space heater
FR2274006A1 (fr) * 1974-06-05 1976-01-02 France Air Cie Fse De Air Puls Diffuseur d'air a chauffage electrique incorpore
FR2292396A1 (fr) * 1974-11-19 1976-06-18 Toure Maurice Dispositif chauffant
DE3340313A1 (de) * 1983-11-08 1985-05-15 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Haushalt-waeschetrockner
EP0320966A1 (fr) * 1987-12-17 1989-06-21 I.R.C.A. S.p.a. Industria Resistenze Corazzate e Affini Dispositif pour chauffer un courant d'air, en particulier pour séchoir à linge du type à tambour

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1944939A1 (de) * 1968-09-12 1970-03-19 Zanussi A Spa Industrie Einrichtung zur Lufterwaermung,insbesondere fuer kombinierte Waschmaschinen
US3870860A (en) * 1973-03-15 1975-03-11 Emerson Electric Co Floor drop-in forced circulation electric space heater
FR2274006A1 (fr) * 1974-06-05 1976-01-02 France Air Cie Fse De Air Puls Diffuseur d'air a chauffage electrique incorpore
FR2292396A1 (fr) * 1974-11-19 1976-06-18 Toure Maurice Dispositif chauffant
DE3340313A1 (de) * 1983-11-08 1985-05-15 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Haushalt-waeschetrockner
EP0320966A1 (fr) * 1987-12-17 1989-06-21 I.R.C.A. S.p.a. Industria Resistenze Corazzate e Affini Dispositif pour chauffer un courant d'air, en particulier pour séchoir à linge du type à tambour

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0813030A1 (fr) * 1996-06-10 1997-12-17 EWT Elektrogeräte GmbH & Co. KG Appareil contrÔleur de formation de givre
EP1067822A1 (fr) * 1999-07-09 2001-01-10 Muller & Cie Société Anonyme Procédé de fabrication d'élément chauffant pour appareil de chauffage ou cuisson, élément chauffant ainsi obtenu et appareils ainsi équipés
FR2796199A1 (fr) * 1999-07-09 2001-01-12 Muller Et Cie Procede de fabrication d'element chauffant pour appareil de chauffage ou cuisson, element chauffant ainsi obtenu et appareils ainsi equipes
US6941680B1 (en) * 2003-07-03 2005-09-13 Robert Zielewicz Cost-efficient clothes dryer
EP1709369A1 (fr) * 2003-08-15 2006-10-11 Inkwell Products, Inc. Systeme de sechage integre a air force
EP1709369B1 (fr) * 2003-08-15 2012-04-04 FlexAir, Inc. Système de séchage intégré à air forcé
EP1643804A1 (fr) * 2004-09-29 2006-04-05 Leister Process Technologies Réchauffeur d'air
US7123822B2 (en) 2004-09-29 2006-10-17 Leister Process Technologies Air heater
CN100452537C (zh) * 2004-09-29 2009-01-14 莱斯特加工技术公司 空气加热器
JP2015149174A (ja) * 2014-02-06 2015-08-20 京セラ株式会社 ヒータ

Also Published As

Publication number Publication date
IT1239248B (it) 1993-09-28
IT9084128A0 (it) 1990-05-11
TR26541A (tr) 1995-03-15
IT9084128A1 (it) 1991-11-11

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