| 摘要 |
PROBLEM TO BE SOLVED: To increase the compression efficiency of an entire compressor by securing a proper gas passage area corresponding to a discharge capacity. SOLUTION: The discharge port 7 of refrigerant gas is formed in a main frame 16, and the discharge valve of a dual structure composed of lower and upper valves 82 and 83 made of thin materials is secured to the attaching hole 17 of the main frame 16 by a caulking pin 18 with a valve presser 81 overlapped on the upper part. The lower valve 82 has the gas passage hole of an opening diameter (b). The area of the gas passage hole of the lower valve 82 is formed to be smaller than the area of the discharge port 7 (b<a). The thickness of the upper valve 83 is formed to be thinner than that of the lower valve 82 and, when the compression pressure of refrigerant gas is low, the lower valve 82 is not operated and the upper valve 83 only are opened and operated, and at a high-speed running, the compression pressure of refrigerant gas also becomes high. Thus, the discharging is performed by raising the lower and upper valves 82 and 83 and the valve pressure 81 simultaneously.
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