Birch, Stewart, Kolasch & Birch, LLP.
Scroll compressor
The area of a back-pressure chamber is increased so that pressing force on a rotational scroll due to back pressure is enhanced to reduce leakage of refrigerant gas through a chip clearance, thereby achieving improved compression efficiency.A scroll compression mechanism configured to form a compression pocket between a fixed scroll and a rotational scroll 10 facing each other and including a thrust plate 12 configured to support a thrust load of the rotational scroll 10, and a back-pressure supplying mechanism 6 configured to supply part of compressed refrigerant gas to a back side of the thrust plate 12 as back pressure are provided. The back-pressure supplying mechanism 6 includes a back-pressure chamber 31 formed on a thrust surface 30 facing the back side of the thrust plate 12, a back-pressure supplying path 32 through which the compressed refrigerant gas is supplied to the back-pressure chamber 31, and an inner seal ring 33 and an outer seal ring 34 disposed radially inside and outside, respectively, of the back-pressure chamber 31. The outer seal ring 34 is provided to be pressed between an inner peripheral surface 37 of a housing 2a and an outer peripheral surface 12a of the thrust plate 12. 
MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.
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Masahiro Makoto Kazuhide
Ohta Takeuchi Watanabe