Variable displacement compressor
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United States of America Patent
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Jan 25, 2011
Grant Date -
Jan 1, 2009
app pub date -
Dec 21, 2006
filing date -
Jan 6, 2006
priority date (Note) -
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Abstract
A variable displacement compressor comprising a first control means for detecting the suction pressure of fluid or the crank chamber pressure and controlling the suction pressure to a target control value, and a second control means including means for detecting high-pressure side pressure to control the displacement of the compressor so as to relax an increase in the high-pressure side pressure when it is equal to or higher than a predetermined threshold and increasing the control value of the suction pressure depending on the increase in the high-pressure side pressure in a region exceeding the threshold. The control system is simple, the control valve is inexpensive and simple and capable of stabilized operation, and the variable displacement compressor has the internal control means suitable for refrigeration cycle operating in a supercritical region.
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