Thermally responsive switch
AssigneeUbukata Industries Co., Ltd.
InventorIsao Higashikata
Life of this patent
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Abstract
A thermally responsive switch includes a movable contact fixed to an end of a thermally responsive plate and a fixed contact which is conductively connected with a conductive pin through a conductor having a fuse part and a heater part to constitute a pair of switching contacts with the movable contact. The thermally responsive switch is used for disconnecting an AC current flowing to a motor inside a sealed electric compressor. The fixed contact is fixed to an electrically insulating ceramic member disposed between the fixed contact and a sealing container.
Claims16
A thermally responsive switch which is used to interrupt AC current flowing into an electric motor provided in a hermetic electric compressor, the switch comprising:
- a hermetic container including a metal housing and a header plate hermetically secured to an open end of the housing, the housing being formed into a cylindrical shape and having a bottom;
- a conductive terminal pin inserted through a through hole formed through the header plate and hermetically fixed in the through hole by an electrically insulating filler;
- a conductive pin inserted through a through hole formed through the bottom of the housing and hermetically fixed in the through hole by the electrically insulating filler;
- a thermally responsive plate having one of two ends conductively connected and fixed to the conductive terminal pin in the hermetic container, the thermally responsive plate being formed into a dish shape by drawing so as to reverse a direction of curvature thereof at a predetermined temperature;
- a movable contact secured to the other end of the thermally responsive plate;
- and
- a fixed contact fixed via an electrical conductor to the terminal pin in the container, the conductor having a fuse part and a heater, the fixed contact constituting a pair of switching contacts together with the movable contact,
- wherein the fixed contact is fixed to an electrically insulating ceramic member disposed between the container and the fixed contact.
Dependencies are inferred from the claim text.