Sheath heater
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United States of America Patent
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Apr 14, 2020
Grant Date -
Mar 7, 2019
app pub date -
Nov 30, 2017
filing date -
Sep 5, 2017
priority date (Note) -
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status (Latency Note)
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Abstract
A sheath heater includes: a housing having an accommodating space formed therein; a plurality of main terminals electrically connected to an outside of the sheath heater through an electric circuit, wherein the accommodating space is filled with magnesia and the plurality of main terminals are disposed in the accommodating space to penetrate through one side and another side of the housing; an overheat preventing means located in the housing, connected in series with the electric circuit, and having a PTC element controlling a flow of current of the electric circuit according to a temperature of the PTC element; and a heating element electrically connected to the electric circuit and generating heat during the flow of current.
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