| 摘要 |
PURPOSE:To make it possible to have a proper check valve function with a simple structure, by encasing a plate-like valve member in the large diameter section of a stepped hole formed in the shoulder section of a cylinder so that the valve member is abutted against a small hole upstream thereof by the pressure of counterflow gas upon the compressor stopping. CONSTITUTION:The shoulder part 4a of a cylinder 4 is formed with a stepped hole 4b, 4c having a large diameter section 4c communicated with the upstream side of a gas passage and a small diameter section 4b communicated with the downstream side thereof, that is, the suction port of a cylinder 4. Further, a plate-like valve member 11 provided with a center section having a diameter D2 larger than the diameter D1 of an upstream gas hole (a frame gas hole 2b) and with a plurality of arm parts 17b, is disposed in the large diameter section 4c. With this arrangement, the valve member 11 is pushed back to the upstream side under the pressure which is produced by counter gas flow upon the compressor stopping, and therefore, is abutted against a frame gas hole 2b for closing the latter. Accordingly, a proper check-valve function may be provided with a simple construction. |
