| 摘要 |
<p>PURPOSE:To surely keep sufficient volume efficiency, and secure sufficient power efficiency. CONSTITUTION:Introduction passages 2A to 2F are formed between bores 1A to 1F and a center axis port 1a. An intake passage 25 is formed on a rotary valve 22 connected to a driving shaft, together with a residual gas bypass groove 28. The residual gas bypass groove 28 is made up of a high pressure side groove 28a which is communicated with a bore 1C at the completion time of discharge through an introduction passage 2C, a low pressure side groove 28b which is communicated with the bore 1A during compression period substantially through the introduction passage 2A, and a communication groove 28c which communicates the high pressure side groove 28a with the low pressure side groove 28b. The residual gas, that is, coolind medium gas after completion of compression is bypassed to the bore during compression process in which pressure is not reduced to the extent of an intake pressure, so that wasteful re-compression is decreased.</p> |
