Eccentric back-pressure chamber seals for a scroll compressor

摘要

A scroll compressor has a back-pressure chamber 28 defined between seals 30,32 mounted eccentrically relative to a scroll shaft rotational axis 45. A back chamber force Fbc, which prevents fixed and orbiting scroll 22,24 separation, acts eccentrically to create an overturning moment Mbc which counteracts a scroll tipping moment Mov of a tangential gas force Ftg. The back chamber force Fbc and thrust force between the fixed and orbiting scrolls 22,24 are minimised, reducing friction and minimising scroll wear, and the back chamber area 28 between the seals 30,32 is reduced, freeing up additional space in the scroll environment which can be utilised for other purposes.