D - Textiles – Paper – 06 – F
Patent
D - Textiles, Paper
06
F
D06F 58/26 (2006.01) D06F 39/04 (2006.01) F24H 3/04 (2006.01) F26B 23/04 (2006.01) H05B 3/26 (2006.01)
Patent
CA 2503968
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.
La présente invention concerne un conduit servant à transporter et chauffer un courant de gaz. Il est intérieurement garni d'une résistance électrique formée d'un film mince. Cette résistance électrique à coefficient de température positif est agencée en périphérie du plan en coupe du passage d'écoulement de gaz dans le conduit, sensiblement parallèlement au sens d'écoulement du gaz, de façon à ne pas lui faire obstacle. Selon un mode de réalisation préféré, la résistance se décompose en une pluralité d'éléments distincts montés en parallèle et alimentés en série cumulative. De cette façon, l'énergie initiale d'alimentation peut être maintenue dans des limites définies, tout en conservant, en conditions stabilisées, un niveau relativement bas d'alimentation mais suffisant pour garantir un niveau de puissance de sortie efficace.
Capraro Duilio
Virzi Andrea
Irca S.p.a.
Macrae & Co.
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