| 摘要 |
<p>PURPOSE:To keep sufficient volumetric efficiency, secure sufficient power efficiency, and suppress increase of a discharge temperature. CONSTITUTION:Spiral introduction passages 2A to 2F are formed for connecting bores IA to IF with an axial center port 1a. A rotary valve 22 having an intake passage 25 is connected to a driving shaft rotatably in a synchronous form. A first leak gas bypass groove 26 are formed on an inner peripheral surface of the axial center port 1a, which groove 26 extends an axial direction in each of seal areas between the introduction passages 2A-2F. A second leak gas bypass groove 27 is formed on the rotary valve 22, which groove 27 extends in a circumferential direction communicatingly separated from both end edges of the first leak gas bypass groove 26, and has a leading end being bent in an axial direction so as to be communicated with the introduction passages 2A to 2F. A low pressure side groove 27c serving as the leading end of the second leak gas bypass groove 27 is preferably set in its angle so as to communicate with a bore 1B, in which compression is substantially started, with an introduction passage 2B. Leaked gas, which is going to move in the circumferential direction of the rotary valve 22 is recovered by a first recovery groove and bypassed to the bore 1B in the compression process.</p> |
