Capacity controllable compressor apparatus

Details Capacity controllable compressor apparatus Capacity controllable compressor apparatus

1990-06-12

1992-03-10

Hepperle, Stephen M.

Pumps

Expansible chamber type

Plural pumping chambers

62468, 62510, 417 7, F04B 2304

Patent

active

050945980

ABSTRACT:
A capacity controllable compressor apparatus has a plurality of high-pressure chamber compressors which are connected in parallel to a common refrigerant suction pipe and a common refrigerant discharge pipe, and oil equalizing pipes through which oil sumps of the plurality of compressors are communicated with each other. One of the plurality of compressors is operated with its chamber kept at a higher internal pressure than other compressors. The compressor apparatus comprises an oil separator disposed to the common discharge pipe; device for returning lubricating oil separated by the oil separator to a suction side of one of the compressors operated with its chamber kept at a higher internal pressure; first control device disposed in the oil equalizing pipes so as to prevent the lubricating oil from flowing into one of the two compressors communicated with each other by the oil equalizing pipe, said one being made inoperative when the capacity of the compressor apparatus is controlled; and valve device disposed in a discharge pipe of the inoperative compressor so as to prevent refrigerant from flowing into the inoperative compressor.

REFERENCES:
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patent: 2008449 (1935-07-01), Hladik
patent: 2326138 (1943-08-01), Grant, Jr.
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patent: 4383802 (1983-05-01), Gianni et al.
patent: 4411141 (1983-10-01), Hara
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PT Werktuigbouw, vol. 21a, No. 5, Mar. 2, 1966, Rijswijk NL, pp. 206A-210A, Knotsenborg, "Automatische olienivellering voor parallel werkende freon compressoren".

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