Improved immersion heating element with highly thermally...

Details Improved immersion heating element with highly thermally... Improved immersion heating element with highly thermally...

H - Electricity

05

B

H05B 3/40 (2006.01) H05B 3/46 (2006.01) H05B 3/82 (2006.01)

Patent

CA 2269600

Electrical resistance heating elements (100) are provided which are useful in heating fluid mediums, such as air and water. The heating elements include an element body (100) having a supporting surface (10) and a resistance wire (14) wound onto the supporting surface (10) which is connected to a pair of terminal end portions (16 and 12). Disposed over the resistance wire (14), and over most of the supporting surface (10), is a polymeric coating (30) which hermetically encapsulates and electrically insulates the resistance wire (14) from the fluids to be heated. This thermally-conductive polymer coating (30) has a thermal conductivity value of at least about 0.5 W/mK. Improved properties are preferably provided by ceramic powder, aluminum oxide and magnesium oxide, and glass fiber additives.

Ces éléments chauffants à résistance électrique (100) s'avèrent des plus utiles s'agissant de chauffer des milieux fluides, de l'air et de l'eau notamment. Ils sont constitués d'un corps (100) pourvu d'une surface servant de support (10) et d'un fil de résistance (14) enroulé autour de cette surface (10) en connexion avec deux parties terminales (16 et 12). Au-dessus du fil de résistance (14) ainsi qu'au-dessus de la majeure partie de la surface de support (10), se trouve un enduit polymère (30) enveloppant hermétiquement ledit fil de résistance (14) et l'isolant des fluides à chauffer. La conductivité thermique de cet enduit polymère (30) est d'au moins 0,5 W/mK. Des produits d'addition à base de poudre céramique, d'oxydes d'aluminium et de magnésium ainsi que de la fibre de verre sont présents, de préférence, dans ces éléments et en renforcent les propriétés.

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