Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Patent
1997-03-24
1999-09-14
Vrablik, John J.
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
418 554, 418 555, 418 57, F04C 1804, F04C 2700
Patent
active
059512717
ABSTRACT:
An axial compliance mechanism for a scroll-type compressor including a fixed scroll member, an orbiting scroll member and a bearing pad spatially fixed in relationship to the fixed scroll member. The axial compliance mechanism biases the orbiting scroll towards the fixed scroll by applying a fluid at high pressure to a radially inner portion of the back surface of the orbiting scroll member and a relatively lower pressure to a radially outer portion of the back surface. An annular stabilization ring is placed between a main bearing pad and the rear surface of the orbiting scroll lifting the orbiting scroll into engagement with the fixed scroll and inhibiting the tilting and wobbling of the orbiting scroll. The annular stabilization ring also maintains a clearance between the rear surface of the orbiting scroll and the main bearing pad thereby improving the performance of a sealing member disposed between the main bearing pad and the rear surface of the orbiting scroll member during start up of the compressor. The annular stabilization ring lifting the scroll member into engagement with the fixed scroll may be located in a shoulder at the outer periphery of the orbiting scroll member or it may form the annular portion of an Oldham ring which controls the orbiting motion of the orbiting scroll member.
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DuMoulin Terrence R.
Gram Brian J.
Tecumseh Products Company
Vrablik John J.
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