초록 ▼

A flexible heating cable using positive temperature coefficient thermistors as a primary heat source with the thermistors being electrically and mechanically connected to substantially flat, preferably braided, electrical conductors with dielectric material preferably separating the conductors. A co

A flexible heating cable using positive temperature coefficient thermistors as a primary heat source with the thermistors being electrically and mechanically connected to substantially flat, preferably braided, electrical conductors with dielectric material preferably separating the conductors. A covering of dielectric material preferably is used to electrically separate the cable from the environment. The cable construction improves the heat transfer from the thermistors to the environment and improves the temperature distribution of the cable.

대표청구항 ▼

An electrical heating cable to provide heat to pipes, tanks and the like, comprising first and second conductor means extending parallel and spaced from each other along the length of the cable for conveying electrical current and for conducting heat; heating means comprising a plurality of chips of

An electrical heating cable to provide heat to pipes, tanks and the like, comprising first and second conductor means extending parallel and spaced from each other along the length of the cable for conveying electrical current and for conducting heat; heating means comprising a plurality of chips of variable resistance heating material electrically connected between said first and second conductor means at longitudinally spaced locations for producing heat when current flows therethrough, said variable resistance chips substantially increasing in resistance when a temperature limit is reached to reduce the current flowing through said heating means and control the heat output of the cable; means for preventing contact between said first and second conductor means along the length of the cable; and wherein each of said conductor means comprises a substantially flat, elongated, multi-stranded electrical conductor having a thermal conductivity so as to conduct substantial amounts of heat relative to said means for preventing contact.