| 摘要 |
PURPOSE:To reduce pressure loss in the low stage side by forming the inner diameter dimension of low stage side compression chamber larger than that of high stage side compression chamber while disposing a low stage side second discharge valve chamber on a specified position in an intermediate partition plate. CONSTITUTION:The respective low and high stage side compression mechanism 21, 22 are disposed above and below, and an intermediate partition plate 23 is disposed therebetween. And between the intermediate partition plate 23 and a main bearing 24 is disposed a low stage side cylinder 25 to form a low stage side compression chamber 26. On the other hand, a high stage side cylinder 28 is disposed between said plate 23 and a sub-bearing 27 to form a high stage side compression chamber 29. Thus, the inner diameter dimension D1 of low stage side compression chamber 26 is set larger than that D2 of high stage one 29. Also, said plate 23 is formed on a position corresponding to the outside of said chamber 29 with a second discharge valve chamber 32' in the low stage side, and a second discharge valve 32 is disposed in the inside of said chamber 32'.
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