| 摘要 |
<P>PROBLEM TO BE SOLVED: To appropriately adjust a back pressure according to whether a vane is positioned in a first stage space or when it is positioned in a second stage compression space in a gas compressor with compression spaces in two stages. <P>SOLUTION: The gas compressor includes an intermediate passage S3 formed between a rotor 50 and a cylinder 40 which connects a first space S1 and a second space S2 to supply refrigerant gas G compressed in the first space S1 with relatively larger volume among two spaces S1, S2 for compression with different volumes to the second space S2 with relatively smaller volume, a cleaning groove 25 which composes a part of a back pressure passage that supplies refrigerating machine oil R of intermediate pressure P4 that relies on the pressure (high pressure P2) of the refrigerant gas G compressed in the second space S2 as the back pressure of a vane 58, and decompression passages 27a, 27b (decompression parts) which connect the cleaning groove 25 and the intermediate passage S3. <P>COPYRIGHT: (C)2013,JPO&INPIT |
