| 摘要 |
PURPOSE:To prevent the increase of the compression ratio by forming a small chamber which selectively communicates to a suction chamber formed on a side block and a discharge side groove part by the revolution of a rotor onto a vane and bypassing gas to the suction side. CONSTITUTION:A groove part 16 communicating to a suction chamber 14 and a groove part 17 communicating to a discharge chamber 15 are formed on the inner surface side of a rear side block 6. A small chamber 18 which selectively communicates to the groove parts 16 and 17, accompanied with the revolution of a rotor, is formed on a vane 18. A portion of the high pressure gas in the discharge chamber is bypassed to the suction chamber 14 side through the small chamber 18. Therefore, the increase of the compression ratio in the high speed operation can be prevented.
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