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US 6,332,329 B1Granted
Swash plate type variable displacement compressor
AssigneeCalsonic Kansei Corporation
InventorsKouetsu Takehana, Masanori Ogawa, Shinichiro Higashihara, Masaki Kawachi, Hiroyuki Makishima
Life of this patent
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Abstract
When a solenoid 42 of a flow-rate control valve drive mechanism is demagnetized, a pilot valve 41 is closed for introduction of working pressure into a pressure chamber 35 of a flow-rate control valve 31 to be stopped, and a spool valve 33 is closed for a low-pressure side refrigerant path 25 to be closed and for a refrigerant suction rate to a refrigerant suction chamber 7 to be reduced to a zero.
Claims8
A variable displacement swash plate compressor comprising:
- a flow-rate control valve installed in a low-pressure side refrigerant path upstream refrigerant suction chamber, and having a spool valve, a spring for biasing the spool valve in a valve closing direction, and a pressure chamber for accumulating pressure for the spool valve to be worked in the valve opening direction;
- and
- a flow-rate control valve drive mechanism installed in a path for communication between a refrigerant discharge chamber and the pressure chamber, and having a pilot valve to be normally closed by a spring and to be controlled of a valve opening degree by an exciting current of a solenoid for a high-pressure side refrigerant of the refrigerant discharge chamber to be introduced and controlled as working pressure to the pressure chamber,
- wherein a flow-rate of a refrigerant to flow in the refrigerant suction chamber is controlled for pressures of the refrigerant suction chamber and a crank chamber to be regulated.
1 more element
A control method for a variable displacement swash plate compressor comprising:
- demagnetizing a solenoid for a pilot valve to be closed when an evaporator is at a temperature less than a freezing temperature;
- closing a spool valve for a pressure of a refrigerant suction chamber to be fallen lower than that of a crank chamber;
- and
- raising an inclined swash plate for a compressing work of the compressor to be reduced to substantially a zero.
1 more element
Dependencies are inferred from the claim text.