| 摘要 |
PURPOSE:To prevent counter flow of high pressure and high-temperature gas in a compressor to a refrigerating system by opening a refrigerant gas passage by means of a spool which forms a check valve mechanism due to flow of refrigerant gas during operation of the compressor and closing the refrigerant gas passage during stoppage of the compressor. CONSTITUTION:During operation of a compressor 1, a spool 16 which forms a check valve mechanism against energizing force of a coil spring 17 by flow of refrigerant gas, is pushed in the direction of flow of the refrigerant gas to open a refrigerant gas passage 23 provided in the spool 16, then a refrigerant gas circuit as a refrigerating system is formed. Next, during stoppage of operation of the compressor 1, flow of the refrigerant gas is stopped, and the spool 16 is pushed by the coil spring 17 to the opposite side of a compressor element 11 and further pushed in the same direction by high temperature and high-pressure gas in an enclosed case 10 leaked from a cylinder part (unillustrated) and the like. As a result, the opening part B of the spool 16 is pushed back from an expanded pipe part 14 to be blocked up by the inner wall face of a case 15 and oil in minute gaps of said wall. Thus, counter flow of high temperature and high-pressure gas in the enclosed case 10 to the refrigerating system can be prevented. |
