| 摘要 |
A gas compressor (1) includes a block part (19) inside which a cylinder chamber (32) is formed; a rotor (23) rotatably housed in the cylinder chamber (32); and vanes (25) provided on an outer circumferential portion of the rotor (23) at intervals in a circumferential direction of the rotor (23) such that the vanes (25) can emerge from the outer circumferential portion. The block part (19) has a pressure supply part configured to supply pressure to backpressure spaces (77) behind the vanes (25). This pressure supply part has an intermediate-pressure supply part (51, 67) which communicates with each backpressure space (77) from an intake cycle to a compression cycle in the compression chamber (33), a first high-pressure supply part (53, 69) which communicates with the backpressure space (77) from the compression cycle to a discharge cycle in the compression chamber (33), and a second high-pressure supply part (72) which is formed between the intermediate-pressure supply part (67) and the first high-pressure supply part (69) independently of the first high-pressure supply part (69) and which communicates with the backpressure space (77) in a middle of the compression cycle in the compression chamber (33). |
