Control valve for variable displacement compressor
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United States of America Patent
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Jun 17, 2008
Grant Date -
Sep 15, 2005
app pub date -
Mar 11, 2005
filing date -
Mar 12, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
To provide a control valve which is capable of maintaining the minimum operation of a variable displacement compressor, by causing a valve section thereof to be fully opened, irrespective of the expanded or compressed state of a bellows, even when the suction pressure of the compressor is high. In the control valve for a variable displacement compressor, a bellows is disposed between a pressure-sensing piston and a core in a pressure-sensing chamber, and a pressing force-transmitting member which is fixed to a plunger is interposed between the pressure-sensing piston and the bellows. Then, a spring which urges the pressing force-transmitting member toward a valve section is disposed between the pressing force-transmitting member and the bellows. As a result, even if the bellows contracts due to high suction pressure Ps, the pressing force-transmitting member is held in a state being urged toward the valve section by the spring, which causes a valve element to be pushed upward via the pressure-sensing piston, to make the valve section fully open, whereby the minimum operation of the compressor can be maintained.
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