Pumps – With condition responsive pumped fluid control – Responsive to pump created drive motor condition
Patent
1977-01-28
1978-03-21
Croyle, Carlton R.
Pumps
With condition responsive pumped fluid control
Responsive to pump created drive motor condition
417282, 417292, 417309, 417310, 418201, F04B 4902
Patent
active
040801101
ABSTRACT:
A variable capacity rotary screw compressor driven by an electric motor and having an adjustable slide valve for varying compressor capacity is provided with a control system for adjusting the slide valve to regulate compressor capacity and thereby maintain a variable system condition, such as gas inlet or outlet pressure or temperature, within a predetermined range. The control system comprises first means including a current transformer for sensing changes in motor current as compressor capacity varies and a current converter connected to the current transformer for providing a first electrical signal proportional to compressor capacity. The control system also comprises means for sensing changes in the particular system condition being monitored and for providing a second electrical signal proportional thereto. The control system further comprises means including a proportioning relay for receiving and comparing the aforesaid first and second electrical signals and for providing a third signal to control operation of the adjustable slide valve to thereby regulate compressor capacity and maintain the system condition within a predetermined range.
REFERENCES:
patent: 2400335 (1946-05-01), Dodson
patent: 3380650 (1968-04-01), Drummond et al.
patent: 3432089 (1969-03-01), Schibbye
patent: 3502026 (1970-03-01), Toyoda
patent: 3924972 (1975-12-01), Szymaszek
patent: 3961862 (1976-06-01), Edstrom et al.
Croyle Carlton R.
Nilles James E.
Ross Thomas I.
Vilter Manufacturing Corporation
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