Refrigeration – Automatic control – Refrigeration producer
Patent
1980-06-16
1982-09-28
Makay, Albert J.
Refrigeration
Automatic control
Refrigeration producer
62203, 62228, 62209, F25D 1702
Patent
active
043511600
ABSTRACT:
A control system for a rotary helical screw compressor of the variable speed type includes a variable speed motor driving the compressor for varying the compressor capacity and a slide valve member which is adjusted optimally for varying the volume of gas trapped in the working chamber prior to discharge as a function of the pressure ratio across the compressor. There is also provided a control system for a rotary helical screw compressor of the fixed speed type which include a first slide valve member for varying the compressor capacity through modulating the volume of gas trapped in the working chamber prior to compression and a second slide valve member for adjusting optimally the volume of gas trapped in the working chamber prior to discharge as a function of the pressure ratio across the compressor.
REFERENCES:
patent: Re29283 (1977-06-01), Shaw
patent: 3355906 (1967-12-01), Newton
patent: 3924972 (1975-12-01), Szymaszek
patent: 4058988 (1977-11-01), Shaw
patent: 4147475 (1979-04-01), Shoop et al.
patent: 4151725 (1979-05-01), Kountz et al.
patent: 4259845 (1981-04-01), Norbeck
Erth Richard A.
Kountz Kenneth J.
Borg-Warner Corporation
Makay Albert J.
Tanner Harry
Tracy James E.
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