| 摘要 |
PROBLEM TO BE SOLVED: To reduce mechanical loss due to seal rings of a back pressure chamber for bearing thrust load acting on a turning scroll of a scroll compressor, while enhancing a seal effect. SOLUTION: An annular groove 6e is formed in an end plate portion 6a of the turning scroll. The back pressure chamber 19 is defined between the end plate portion 6a and a surface of a middle housing supporting it. Thrust load caused by compression reactive force is counterbalanced by introducing high pressure fluid in the back pressure chamber 19. The two seal rings 11, 12 are provided for preventing leakage of the high pressure fluid from the back pressure chamber 19. These seal rings may be united by a connection portion. The respective seal rings are constructed for movement (slanting in this case) in the annular groove 6e. They, when moving, form annular contact areas of high bearing at portions contacting with a surface of the annular groove 6e or a surface of the associated middle housing, and a high seal effect is obtained while controlling the mechanical loss. COPYRIGHT: (C)2004,JPO
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