Glow plug with porous PTC element impregnated with metal therein
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United States of America Patent
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-
Nov 10, 1998
Issued Date -
N/A
app pub date -
Jul 28, 1997
filing date -
Apr 22, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An electric current self-controlling device is prepared by impregnating a porous structure of a PTC material with a fused form of aluminum in a vacuum so that it can act as a heat sensor with the contact area between the PTC material and aluminum being increased. The outer surface of the metal impregnating PTC structure is covered with insulating films of alumina and the PTC material is accompanied with an outer terminal 43 and the aluminum impregnating in the PTC material is connected with an inner terminal 44. A terminal screw 3, the current controller device 4, the heating coil 51, and a current limiting coil 52 are connected in series. Accordingly, the heating temperature of the heating coil 51 can be determined by controlling the flow of the energizing current from the terminal screw 3 with the positive temperature coefficient resistant action and nonlinear variable resistance action of the current controller device 4.
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