EP1813711A1 - Maschine zum Waschen und/oder Trocknen von Wäsche - Google Patents

Maschine zum Waschen und/oder Trocknen von Wäsche Download PDF

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Publication number
EP1813711A1
EP1813711A1 EP06101040A EP06101040A EP1813711A1 EP 1813711 A1 EP1813711 A1 EP 1813711A1 EP 06101040 A EP06101040 A EP 06101040A EP 06101040 A EP06101040 A EP 06101040A EP 1813711 A1 EP1813711 A1 EP 1813711A1
Authority
EP
European Patent Office
Prior art keywords
container body
heating element
machine according
plates
outer shell
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Withdrawn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
EP06101040A
Other languages
English (en)
French (fr)
Inventor
Giuseppe Marchitto
Alberto Vassalli
Fabrizio Manfredoni
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.)
IAR-SILTAL SpA
Original Assignee
IAR-SILTAL 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 IAR-SILTAL SpA filed Critical IAR-SILTAL SpA
Priority to EP06101040A priority Critical patent/EP1813711A1/de
Publication of EP1813711A1 publication Critical patent/EP1813711A1/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Withdrawn legal-status Critical Current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 
    • D06F58/26—Heating arrangements, e.g. gas heating equipment

Definitions

  • the present invention relates in general to electrical household appliances provided with a system for air heating or condensation that comprises at least one resistance or heating element. More in particular, the present invention has been developed with particular reference to an element for air heating suitable for use in machines for treating laundry.
  • washing-drying machines machines for washing and drying laundry
  • heating elements whereby, at the end of the washing and spin-drying cycles, the laundry is dried.
  • specific and independent drying machines into which the washed laundry is transferred to be subjected to drying.
  • the above machines comprise a drum -- which in the case of washing-drying machines is the same drum in which the laundry is placed for washinginto which a flow of hot air is caused to enter by means of a fan; the air is typically heated by means of a heating element or resistance, through which the air passes before being delivered into the drum, the latter being appropriately caused to rotate to encourage uniform drying of the contents.
  • the known heating elements used in the appliances in question essentially consist of a body of prismatic shape, two opposing sides being open to provide for the entrance and exit of the forced air flow and, at least along two walls, provided with plate-shaped supports of insulating material; the resistive units, usually in the form of small aligned coils, are fixed to these supports.
  • the remaining upper and lower walls of the element are defined by two plate-shaped bodies of sheet metal, which hold the whole together through screws or equivalent fixing means.
  • the air flow is not precisely channelled and heating of the air requires considerable installed power, generally between 2.2 and 2.5 kW; a conspicuous part of the heat, furthermore, is dissipated especially from the open sides of the element, overall causing considerable energy consumption.
  • the primary aim of the present invention is to resolve the drawbacks mentioned above.
  • a purpose of the invention is to produce a machine of the type indicated provided with an improved heating element in which the flow of air to be heated is precisely channelled and, in consequence, heat exchange comes about in an optimal fashion.
  • Another purpose of the invention is to provide a machine of the type indicated equipped with a heating element in which heat loss is negligible.
  • a further purpose of the invention is to provide a machine of the type indicated fitted with a heating element of limited installed power, but nevertheless able to bring the air to the temperature required by the operative standards of the machine.
  • a further purpose of the invention is to provide a machine of the type indicated fitted with a heating element able to ensure a high degree of efficiency and reliability over time, which is also such as to be easily and economically produced.
  • Figure 1 represents, in a very schematic form, an electrical household appliance for treating laundry; for the purposes of the present intervention it is supposed that this appliance is a washing-drying machine, indicated with 1 as a whole, taking it however for granted that the invention is also applicable to drying machines.
  • the machine 1 which in the non-limiting example is of the top-loading type, comprises a casing 2 within which is supported in known fashion a tank 3; inside the tank 3 is rotatably mounted a drum 4 to contain the laundry, appropriately activated through an electric motor and the relative transmission and control means, likewise of known type.
  • the machine 1 also comprises known means to take in and discharge the washing water and means to deliver the detergent, as well as a drying system, indicated with 5 as a whole, that comprises means of ventilation, heating and condensation of the air.
  • a drying system indicated with 5 as a whole, that comprises means of ventilation, heating and condensation of the air.
  • Such system 5 comprises an element to heat the air, or resistance, indicated with 10 as a whole.
  • the heating element 10 that constitutes the specific subject of the invention, comprises a frame or inner body 12 to support resistive elements or spiral resistances, of known type.
  • the inner body 12, represented in figure 3, is formed by plates 14, 14', 16, 16' of electrically insulating material, disposed so as to form a box with substantially rectangular section, open at the two opposed longitudinal extremities.
  • the said plates form a duct or tunnel, 18, for the passage of air, in which said spiral resistances are arranged, stabilised in appropriate recesses or seats practised on two or more of said plates; in the case given as an example seats or through openings are provided for this purpose, in substantially specular positions on plates 16 and 16', said openings only being represented in figure 2, where they are indicated as 16a; each spiral resistanceonly one of which is represented in diagram form and indicated as R, extends between two respective opposing openings 16a, respectively housing the two opposite regions of the spiral resistance; the various spiral resistances R, which thus extend transversely to the direction of the air flow in the tunnel 18, are connected electrically one to the other on the outer side of plates 16, 16'.
  • each of a series of spiral resistances R may consist of a respective coiled part of a single
  • the plates 14, 14', 16, 16' are made of any insulating material, preferably such as steatite, magnesite or, preferably, ceramic; along the longitudinal edges of the plates 16, 16' projections may be provided that are adapted to engage in respective recesses or seats formed in the plates 14, 14'.
  • the two opposing plates 14 and 14' oriented horizontally in figure 3, substantially parallel are of width greater than the distance between the two plates 16 and 16' oriented vertically, they too opposing and substantially parallel. In this way, therefore, plates 14, 14' project laterally with regard to the two plates 16, 16', along the entire longitudinal extension of the inner body 12.
  • the inner body 12 that contains and supports the spiral resistances R, constituted of said plates of insulating material, is delimited by a metal housing or intermediate containing body 20, illustrated in schematic form in figure 4, made of sheet metal or any other appropriate material, for example galvanised iron.
  • the intermediate body 20 delimits and precisely compacts the inner body 12, adhering to it along the opposing upper and lower faces, defined by plates 14 and 14', as well as along the lateral edges of these same plates, that project from the remaining plates 16 and 16' oriented vertically. Note that in this way two longitudinal cavities C (see figures 1 and 6) are delimited between the plates 16, 16' of the inner body 12 and the walls of the intermediate body 20 facing them; the means for electrical connection between the various coils run in these cavities C, and if necessary parts of the relative power-supply cable or cables, without any risk of contact with the body 20.
  • the front and rear edges of the upper and lower walls of the body 20 are provided with cantilever projections, indicated with 20a; these projections 20a are destined to be folded substantially at right angles inwards regarding the body 20, so as to maintain the inner body 12 in the correct operative and assembly position, as is shown for example in figures 1 and 6.
  • the metal housing or intermediate body 20 is provided, along the lateral surface, with a plurality of projections or reliefs 22, of any form and development, projecting outwards from the body, having the function specified below; such reliefs 22, obtained for example through a drawing process on the sheet metal forming the body 20, are of preference situated on at least two opposing faces of the body.
  • the assembly formed by the inner body 12 of insulating material and the metal body 20 that encompasses it is in its turn inserted within an outer shell 24, schematically represented in figure 5, equally made of sheet metal or other suitable material.
  • the outer shell 24 defines a rectangular section whose dimensions are such as to encompass the body 20 without adhering to it, excepting locally in correspondence with the reliefs 22, that is maintaining a distance of for example between 5 and 20 mm around it. This distance is determined advantageously by the extent of projection of the reliefs 22 practised on the intermediate body 20, and gives rise to the creation between the latter and the outer shell 24 of an insulating chamber, indicated with 26 in figures 1 and 6, of perimetral development, wherein ambient air is distributed.
  • the outer shell 24 is stabilised with regard to the intermediate body 20 through screws, rivets or equivalent means of fixture, destined to be fixed into the exposed extremities of the reliefs 22.
  • these latter may present, as in the example illustrated, a truncated cone development, with through hole 28 on the lesser base or exposed front.
  • the outer shell 24 is provided with through holes 30, destined to align with those 28 of the reliefs 22.
  • the spacer means between the body 20 and the outer shell 24 might, rather than reliefs 22, be obtained by flaps made through shearing, in correspondence with the front and rear edges of the lateral walls of the body 20, similarly to the case of the projections 20a; these flaps -- one of which is represented in diagram form in figure 7, where it is indicated with 22a - are then folded to an L shape inwards versus the body 20; in this way, a portion of the extremity of the flap 22a is substantially parallel to and adjacent to the opposing lateral wall of the outer shell 24, in such portion being provided with at least one hole 28, having a similar function to that of the knobs 22.
  • the longitudinal extension of the heating element or resistance 10 is markedly greater than its width, so as to facilitate heat exchange between the forced air, coming from a conventional fan which is part of the drying system 5, and the resistive elements R situated in the support or inner body 12 of insulating material, powered electrically in known fashion.
  • the flow of forced air to be heated is channelled precisely into the tunnel 18 of the resistance 10, in which it remains for an appreciable time-span, since the resistance has greater development in length.
  • the longitudinal extension of the heating element 10 may be equal to approximately double that of a typical heating element for drying machines (at least 12 cm against 6 cm).
  • the three components 12, 20 and 24 of the heating element 10 have essentially equal longitudinal extension.
  • the heating element 10 of the machine according to the invention enables the flow of forced air to be channelled with precision to the spiral resistances, achieving optimal heat exchange with the air not least as a function of the considerable longitudinal development of the tunnel 18; this latter, developed in the direction of the airflow, thus increases the time that the air spends within it.
  • the installed power in consequence, may be appreciably reduced compared to traditional resistances for analogous use, nevertheless guaranteeing the same degree of heating of the air. Experimental tests conducted by the applicant have shown that such power may be reduced at least by 40 or 50% compared to that installed on conventional resistances of equivalent use (approximately 1100 kW in the case of the invention and 2000-2500 kW in the case of a known drying machine).
  • Heat loss is minimised thanks to the insulation obtained through the intermediate body 20, the outer shell 24 and the air space 26 created between them, this latter being open at both its longitudinal extremities.
  • the improved heating element 10 as detailed above, is particularly indicated for use in washing-drying machines, drying machines, or machines with condensation circuits, but it is clear that it could also be used in electric household appliances of other types, in which it is necessary to heat a flow of air.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
EP06101040A 2006-01-30 2006-01-30 Maschine zum Waschen und/oder Trocknen von Wäsche Withdrawn EP1813711A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06101040A EP1813711A1 (de) 2006-01-30 2006-01-30 Maschine zum Waschen und/oder Trocknen von Wäsche

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06101040A EP1813711A1 (de) 2006-01-30 2006-01-30 Maschine zum Waschen und/oder Trocknen von Wäsche

Publications (1)

Publication Number Publication Date
EP1813711A1 true EP1813711A1 (de) 2007-08-01

Family

ID=36593025

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06101040A Withdrawn EP1813711A1 (de) 2006-01-30 2006-01-30 Maschine zum Waschen und/oder Trocknen von Wäsche

Country Status (1)

Country Link
EP (1) EP1813711A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2022885A1 (de) * 2007-07-31 2009-02-11 DBK David + Baader GmbH Kleidertrocknungsvorrichtung mit Luftdurchgangselement mit isoliertem Bereich sowie Erwärmungseinheit und äußere Abdeckung dafür

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2996594A (en) 1956-05-18 1961-08-15 Tuttle Electric Products Inc Molded electric heater and method of making same
GB2123538A (en) 1982-05-21 1984-02-01 Miele & Cie A heating means for a drier for drying washing
DE9401864U1 (de) 1994-02-04 1994-03-31 Tuerk & Hillinger Gmbh Heizregister
EP1614792A1 (de) * 2004-07-06 2006-01-11 Samsung Electronics Co., Ltd. Trommelwaschmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2996594A (en) 1956-05-18 1961-08-15 Tuttle Electric Products Inc Molded electric heater and method of making same
GB2123538A (en) 1982-05-21 1984-02-01 Miele & Cie A heating means for a drier for drying washing
DE9401864U1 (de) 1994-02-04 1994-03-31 Tuerk & Hillinger Gmbh Heizregister
EP1614792A1 (de) * 2004-07-06 2006-01-11 Samsung Electronics Co., Ltd. Trommelwaschmaschine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2022885A1 (de) * 2007-07-31 2009-02-11 DBK David + Baader GmbH Kleidertrocknungsvorrichtung mit Luftdurchgangselement mit isoliertem Bereich sowie Erwärmungseinheit und äußere Abdeckung dafür

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