| 摘要 |
A self-regulating heater (12) used particularly in an early fuel evaporation system for an automotive engine comprises a thermally conducting metal radiator body (22) of substantial size and thermal conductivity having a first heat-receiving side (24) and having a second, opposite side (26) for transferring heat to a fuel or other heating zone. A thin plate (35) of thermally and electrically conductive metal material has a plurality of self-regulating electrical resistance heater discs (36) of a ceramic material of positive temperature coefficient of resistivity arranged with one disc side reliably bonded to a first side (35) of the plate in electrically and thermally conducting relation to the plate (35). The opposite side of the plate (35) is secured in closely spaced, facing, electrically connected relation to the heat-receiving side (24) of the radiator (22) for transferring heat to the radiator (22) and for connecting the heater discs (36) to electrical ground through the radiator body (22). Power supply means are electrically connected to the opposite sides of the heater discs (36) and a thermally conducting filler material (39) is disposed between the opposite plate side (35) and the heat-receiving side (24) of the radiator (22) to enhance heat transfer to the radiator body (22). If desired, a thermally conducting cover cooperates with the radiator body (22) for enclosing the heater discs (36) and a thermally conducting, electrically insulating compound fills the enclosure to provide improved heat transfer from both sides of the heater discs (36) to the radiator (22). |
