Control of scroll compressor at shutdown to prevent unpowered re

Details Control of scroll compressor at shutdown to prevent unpowered re Control of scroll compressor at shutdown to prevent unpowered re

1998-07-13

2000-03-28

Doerrler, William

Pumps

With condition responsive pumped fluid control

Pressure responsive relief or bypass valve

417440, F04B 4900, F04B 2300

Patent

active

060423447

ABSTRACT:
A unique method of operating a scroll compressor includes the steps of opening a capacity modulation unloader valve slightly before shutdown of the scroll compressor. By opening the unloader valve, the occurrence of unpowered reverse rotation is reduced or eliminated. Most preferably, the unloader valve communicates an economizer line to a suction inlet line.

REFERENCES:
patent: 4762469 (1988-08-01), Tlscher
patent: 4840545 (1989-06-01), Moilanen
patent: 5607288 (1997-03-01), Wallis et al.
patent: 5803716 (1998-09-01), Wallis et al.
patent: 5897299 (1999-04-01), Fukunaga

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