| 摘要 |
PURPOSE:To improve sealing property between a rotor and a bearing while reducing a useless volume of a discharging port by interposing an auxiliary plate made of a high rigidity material between a cylinder and a bearing and forming this auxiliary plate with the discharging port and a valve seat. CONSTITUTION:An auxiliary plate 21 formed of a 1.5-2.0mm thick spring material is interposed between a cylinder 3 and a main bearing 5a. A portion of the main bearing 5a opposed to a compression chamber 4 is formed with a hole 22 and the auxiliary plate 21 is formed in the portion opposed to the hole 22 with a discharging portion 11a. This discharging portion 11a is formed of a discharging port 23 and a valve seat 24 against which an end of a valve plate 16 bears. Since the auxiliary plate 21 has high rigidity, even if the thickness is thinned and the useless volume of discharging port 23 is reduced, the flatness of said plate 21 does not change so that it can securely seal between a roller 9 and the main bearing 5a.
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