Vane compressor with means for obtaining sufficient back pressure upon vanes at the start of compressor
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United States of America Patent
Stats
-
Mar 17, 1992
Grant Date -
N/A
app pub date -
Mar 8, 1990
filing date -
Mar 20, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A vane compressor includes a cylinder having a pair of side blocks. A communication passage is formed through at least one of the side blocks. The communication passage has one end thereof opening into a discharge pressure chamber, and another end thereof opening in a rotor side end face of the at least one of the side blocks at a location corresponding to the orbital path of an end of a back pressure chamber defined in each of vane slits having a vane slidably fitted therein. The communication passage is provided therein with a valve which opens the communication passage when the difference between pressure in the discharge pressure chamber and pressure in the back pressure chamber is below a predetermined value, and closes same when the difference in pressure is above the predetermined valve.
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