Title:
CONDUIT WITH IMPROVED ELECTRIC HEATING ELEMENT AND CLOTHES DRYING MACHINE PROVIDED WITH SUCH A CONDUIT
Document Type and Number:
WIPO Patent Application WO2004042132
Kind Code:
A3
Abstract:
Conduit (1) for conveying and heating a flow of gas, comprising in its interior at least an electric heating element (2) formed by a thick-film layer, in which said electric heating element (2) works as a positive temperature coefficient (PTC) element and is arranged peripherally in relation to the gas flow cross-section of the conduit, i.e. is oriented in a substantially parallel manner to the flow direction of said gas, so that the latter is not even partially obstructed by such a thick-film layer. In a preferred manner, this heating element (2) is subdivided into a plurality of individual and distinct heating elements arranged (R1, R2, R3) in parallel and energized in a successive and cumulative manner so that the initial power input can be maintained within pre-established limits, while the power input under steady-state conditions is reduced to a quite lower value, which is however still sufficiently high as to ensure an acceptable power output level.
Inventors:
VIRZI ANDREA (IT)
CAPRARO DUILIO (IT)
CAPRARO DUILIO (IT)
Application Number:
PCT/EP2003/009928
Publication Date:
June 10, 2004
Filing Date:
September 08, 2003
Export Citation:
Assignee:
IRCA SPA (IT)
VIRZI ANDREA (IT)
CAPRARO DUILIO (IT)
VIRZI ANDREA (IT)
CAPRARO DUILIO (IT)
International Classes:
D06F39/04; D06F58/26; F24H3/04; F26B23/04; H05B3/26; (IPC1-7): D06F58/26; D06F39/04; F24H3/04; H05B3/26
Foreign References:
| EP1154066A2 | 2001-11-14 | |||
| GB1502919A | 1978-03-08 | |||
| EP0485211A1 | 1992-05-13 | |||
| EP0352499A2 | 1990-01-31 |
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