Pumps – With condition responsive pumped fluid control – Pressure responsive relief or bypass valve
Patent
1980-11-03
1983-05-17
Vrablik, John J.
Pumps
With condition responsive pumped fluid control
Pressure responsive relief or bypass valve
417310, 417440, 418 55, F04B 4902, F04B 4908, F04C 1802
Patent
active
043838057
ABSTRACT:
A gas compressor of the scroll type is disclosed wherein unloader means are provided for selectively varying its capacity by effectively delaying the point at which the closed moving volumes defined between the wrap elements begin compression. To this end, passage means extend through the end plate means of the compressor from a location in communication with the closed moving volumes to a location in communication with working gas normally at suction pressure during operation of the compressor. Valve means are provided for selectively blocking flow through the aforementioned passage means, whereby the compressor operates at a relatively high capacity; and for permitting flow through the passage means, whereby gas is exhausted via the passage means to suction pressure as the closed moving volumes progress radially inwardly to a predetermined position at which compression is permitted to begin.
REFERENCES:
patent: 2519913 (1950-08-01), Lysholm
patent: 3295752 (1967-01-01), Bellmer
patent: 4065279 (1977-12-01), McCullough
patent: 4068981 (1978-01-01), Mandy
patent: 4222715 (1980-09-01), Ruf
patent: 4314796 (1982-02-01), Terauchi
patent: 4332535 (1982-06-01), Terauchi et al.
Teegarden Arlo F.
Utter Robert E.
Anderson Ronald M.
Ferguson Peter D.
Lewis Carl M.
The Trane Company
Vrablik John J.
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