Importance

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Abstract

A positive temperature coefficient (PTC) rod assembly having PTC elements including a channel-shaped, lower PTC rod, a contact plate with through-holes, and an insulator with protrusions penetrating through the through-holes. The insulator is coupled to and wraps a portion of the contact plate, and includes first and second seating sections exposing portions of side surfaces of the contact plate. PTC elements are in the first seating sections and in contact with the contact plate, heat transfer blocks are in the second seating sections in contact with the contact plate, and an upper PTC rod is coupled to the lower PTC rod to cover an open portion of the lower PTC rod. A vehicle pre-heater includes a plurality of such PTC rod assemblies in parallel to one another, with heat radiation fin assemblies coupled in close contact with both surfaces of each of the PTC rod assemblies, a pair of frames coupled to outer side surfaces of the outermost heat radiation fin assemblies, and first and second housings coupled to both longitudinal ends of a combination of the PTC rod assemblies, the heat radiation fin assemblies and the frames. Housing terminals are provided in the housings and serve as cathode terminals.

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First Claim