Compressor having capacity modulation system
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United States of America Patent
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Aug 27, 2013
Grant Date -
Aug 2, 2012
app pub date -
Feb 7, 2012
filing date -
May 30, 2008
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A compressor includes first and second scroll members, a piston and a control valve. The first scroll member includes an end plate defining a capacity modulation passage. The first and second scroll members form a suction pocket, an intermediate compression pocket and a discharge pocket. The capacity modulation passage is in communication with the first intermediate compression pocket. The piston is supported on the first scroll member and partially defines a modulation control chamber. The control valve is in communication with the control chamber and selectively provides communication between the control chamber and one of the first and second pressure sources to displace the piston between a closed position and an open position. The piston isolates the capacity modulation passage from communication with the suction pressure region when in the closed position and provides communication between the capacity modulation passage and the suction pressure region when in the open position.
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