| 摘要 |
PROBLEM TO BE SOLVED: To suppress leakage of lubricating oil into a compression chamber during suspension of a gas compressor. SOLUTION: A space 41a between oil-seals 18, 23 and bearings 15, 21 is allowed to communicate with a low-pressure conductive hole 42 opened to the open-air through a depressurizing conductive hole 41. An opening/closing valve 43 is provided on the side of the low-pressure conductive hole 42 of the depressurizing conductive hole 41 so as to open/close the low-pressure conductive hole 42. Thus, in the case of suspension of the gas compressor, the pressure in the space 41a and a lubricating-oil space 9 is lowered simultaneously with pressure reduction in the compression chamber 10a, and a valve element 44 moves downward to open the low-pressure conductive hole 42, and the pressure of the lubricating-oil space 9 becomes nearly equal to the atmospheric pressure. Consequently, the pressure on the side of the lubricating-oil space 9 is prevented from becoming higher than that of the compression chamber 10a, and the lubricating oil is prevented from leaking from the lubricating-oil space 9 into the compression chamber 10a. COPYRIGHT: (C)2005,JPO&NCIPI
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