Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Patent
1995-07-03
1996-03-05
Freay, Charles
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
137527, F01C 104
Patent
active
054961602
ABSTRACT:
A compressor is provided with a check valve which is disposed in a suction chamber adjacent a suction port opening. The check valve provides fast response and enhanced operating characteristics for preventing reverse refrigerant flow and reverse scroll operation during compressor shutdown. During normal compressor operation the check valve is open to allow communication of refrigerant into the suction chamber where the refrigerant is acted upon by the scroll mechanism and discharged through a discharge port. A positive pressure differential exists between the discharge port and the suction port which unimpeded causes reverse scroll operation upon compressor shutdown. The positive pressure condition in the suction chamber forces the check valve to pivot to a closed position whereby it covers and substantially seals the suction port. By preventing reverse refrigerant flow through the suction port the check valve effectively eliminates the pressure differential and thereby prevents reverse scroll operation.
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Herrick Todd W.
Richardson, Jr. Hubert
Freay Charles
Tecumseh Products Company
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