Scroll compressor capacity control valve

Details Scroll compressor capacity control valve Scroll compressor capacity control valve

1995-12-01

1996-09-03

Gluck, Richard E.

Pumps

With condition responsive pumped fluid control

Pressure responsive relief or bypass valve

417310, 417440, 418 551, F04C 1802

Patent

active

055518460

ABSTRACT:
A scroll compressor has a housing, fixed and movable scrolls mounted in the housing, and a control valve. The fixed scroll has a discharge port and pairs of bypass ports located at thermodynamically symmetrical points in the compression cycle relative to said discharge port The moving scroll is mounted in the housing and intermeshed with the fixed scroll to trap a volume of fluid. A rotatable, cylindrical control valve has pairs of slots therein that are alignable with the pairs of bypass ports to sequentially vent the trapped fluid and modulate the capacity of the compressor. The valve controls the pumping capacity of the scroll compressor by placing a series of bypass ports across the base of the fixed scroll. The bypass ports allow gas to flow from the compression chambers via the control valve to the low pressure chamber. The flow and sequencing of the ports is controlled by rotating the valve crossing over the ports. As the bypass ports are uncovered, the partially compressed gas from the working chamber is vented to the low pressure chamber reducing the output of the pump. By opening several sets of ports progressively from early stages of compression to final compression, the compressor capacity is reduced with minimum waste work.

REFERENCES:
patent: 2265444 (1941-12-01), Morrison et al.
patent: 3628893 (1971-12-01), Carpigiani
patent: 4656710 (1987-04-01), Maciejewski
patent: 4717314 (1988-01-01), Sato et al.
patent: 4904164 (1990-02-01), Mabe et al.
patent: 5356271 (1994-10-01), Miura et al.
patent: 5451146 (1995-09-01), Inagaki et al.

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