Rotary expansible chamber devices – Heat exchange or non-working fluid lubricating or sealing – With condition responsive control of non-working fluid
Patent
1988-01-07
1989-08-29
Vrablik, John J.
Rotary expansible chamber devices
Heat exchange or non-working fluid lubricating or sealing
With condition responsive control of non-working fluid
418100, F04C 2902
Patent
active
048612464
ABSTRACT:
In a positive displacement compressor, first and second liquid injection holes are provided. The first hole is subjected substantially to the intake pressure. The other is subjected to a higher average pressure. A valve controls flow towards the first hole. When the discharge pressure is high, injection occurs through the second hole, the valve is closed. Under such operating conditions, the compressor has a good efficiency because the gas resulting from flashing of the injected liquid in the compressor needs only to be recompressed from said higher average pressure instead from said intake pressure, and does not take up space in the compressor which would limit the intake capacity of the compressor. If the discharge pressure decreases, the valve opens, allowing for injection through the first hole, thus eliminating the risks of seizure in the compressor if the injection liquid is at a pressure lower than the pressure in front of the second orifice, thus at a pressure insufficient for injection through the second orifice. The valve is a check-valve biased by a spring.
REFERENCES:
patent: 1675524 (1928-07-01), Zajac
patent: 2204757 (1940-06-01), Henze
patent: 3542497 (1970-11-01), Chapuis
patent: 3820350 (1974-06-01), Brandin et al.
patent: 3904321 (1975-09-01), Ruedi et al.
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