Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Patent
1997-11-18
2000-11-14
Nguyen, Hoang
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
418 555, 418 57, F01C 102
Patent
active
061461199
ABSTRACT:
A scroll compressor (10) is disclosed which incorporates, in the first embodiment, a floating seal (50) having an inner face seal (52) and an outer face seal (54). The floating seal also has inner and outer diametric seals (58, 60) to seal against the walls of a recess (41) in the crankcase (36). The axial thickness of the floating seal exceeds the depth of the recess. As the scroll compressor undergoes start-up, the orbiting scroll element (14) is forced against the face seals (52, 54) to create a sealed chamber (40). Intermediate pressure from a compression pocket between the scroll elements pressurizes chamber (40) defined between the seals to force the orbiting scroll element (14) into engagement with the fixed scroll element (12). In a second embodiment, a floating seal (80) uses actuator piston (88) which is urged into continuous sealing contact with the orbiting scroll element (14) by an actuator spring (92) to create a sealed chamber. Upon start-up, the chamber (96) is provided with intermediate pressure gas which urges the orbiting scroll element (14) into engagement with the fixed scroll element (12).
REFERENCES:
patent: 5588820 (1996-12-01), Hill et al.
patent: 5613841 (1997-03-01), Bass et al.
patent: 5833442 (1998-11-01), Park et al.
patent: 5833443 (1998-11-01), Lifson
Barito Thomas R.
Bush James W.
Shoulders Stephen L.
Carrier Corporation
Nguyen Hoang
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