| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of the chattering of a vane caused by the temporary pressure reduction of a back pressure space of the vane in a post-stage of a compression process and a discharge process.SOLUTION: A back pressure space 77 of a vane groove 75 which is finished in communication with an intermediate pressure supply groove 67 communicates with a first high-pressure supply part 69a until the refrigerant pressure of compression chambers 33a, 33b and 33c which are partitioned by a vane 25 of the vane groove 75 reaches the highest pressure, and high-pressure from the first high-pressure supply part 69a is supplied. After that, the back pressure space 77 finishes communication with the first high-pressure supply part 69a before the back pressure space 77 of the vane groove 75 at an upstream side in a rotation direction X communicates with the first high-pressure supply part 69a, and communicates with a second high-pressure supply part 69a at a downstream side of the rotation direction X, and high-pressure is supplied once again. That is, at a time point at which the back pressure space 77 which is finished in communication with the intermediate pressure supply part 67 communicates with the first high-pressure supply part 69a of the high-pressure supply groove 69, the preceding back pressure space 77 which adjoins a downstream side in the rotation direction X of the back pressure space 77 does not simultaneously communicate with the first high-pressure supply part 69a.SELECTED DRAWING: Figure 2 |
