Refrigerant compressor protective switch system
AssigneeNissan Motor Co., Ltd.
InventorMasao Izumi
Life of this patent
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Abstract
In a compressor protective switch system for the refrigerant compressor of the refrigeration system of an automotive air conditioner, a pressure sensitive switch adapted to be open in response to a refrigerant pressure lower than a relatively high predetermined value is paralleled by a positive temperature coefficient (PTC) resistance element or a series combination of a PTC resistance element and an atmospheric temperature sensitive switch adapted to be open in response to an atmospheric temperature lower than a predetermined value.
Claims5
A protective switch system for an electromagnetically operated clutch of a refrigerant compressor in a refrigeration system of an air conditioner for automotive use, wherein the improvement comprises a parallel combination of a pressure sensitive switch which is responsive to the pressure of the refrigerant to be circulated through said refrigeration system and which is operative to be open in response to a refrigerant pressure lower than a predetermined value on the high pressure side of the system, a positive temperature coefficient resistance element connected in parallel with said pressure sensitive switch, the parallel combination being connected in series with said clutch, and a temperature sensitive switch responsive to the temperature of atmospheric air and operative to be open in response to an atmospheric temperature lower than a predetermined value, said temperature sensitive switch being connected in series with said positive temperature coefficient resistance element.
Dependencies are inferred from the claim text.