Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Patent
1997-01-28
1998-06-09
Doerrler, William
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
418 57, F01C 104, F04C 1804
Patent
active
057624836
ABSTRACT:
An improved control over the pressure vented or tapped to a back pressure chamber in a scroll compressor is achieved by maintaining a vent hole closed for the majority of the operational cycle of the scroll compressor. The hole is preferably selectively exposed to a discharge pressure for a small portion of the cycle, and to an intermediate pressure for a second small portion of the cycle. Other than those two small portions, the hole is preferably closed. The invention reduces pulsation in the back pressure chamber and also reduces pumping losses caused by fluid moving into and out of the back pressure chamber through the hole. In one embodiment, grooves are formed in the fixed scroll member to communicate a selected intermediate pressure and a discharge pressure to locations on the base plate of the fixed scroll member. A vent hole in the wrap of the orbiting scroll member cyclically moves over the two grooves. The vent hole is closed by the base plate of the fixed scroll member for the majority of its operational cycle. In a second embodiment, a pair of holes are formed through the base plate of one of the scroll members. The holes are covered by the wrap of the other scroll member for the majority of the operational cycle of the scroll compressor. Each hole is open for a small portion of the operational cycle to selectively tap an intermediate and discharge pressure to the back pressure chamber.
REFERENCES:
patent: 3924977 (1975-12-01), McCullough
patent: 4343599 (1982-08-01), Kousokabe
patent: 4384831 (1983-05-01), Ikegawa et al.
patent: 4645437 (1987-02-01), Sekashita et al.
patent: 4669962 (1987-06-01), Mizuno et al.
patent: 4989414 (1991-02-01), Murayama et al.
patent: 4992032 (1991-02-01), Barito et al.
patent: 5520526 (1996-05-01), Fujio
Bush James W.
Lifson Alexander
Carrier Corporation
Doerrler William
LandOfFree
Scroll compressor with controlled fluid venting to back pressure does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Scroll compressor with controlled fluid venting to back pressure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Scroll compressor with controlled fluid venting to back pressure will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2193272