Method of controlling the air output of a screw compressor

Details Method of controlling the air output of a screw compressor Method of controlling the air output of a screw compressor

1989-09-25

1990-11-06

Smith, Leonard E.

Pumps

Condition responsive control of pump drive motor

Single motor control element responsive to means sensing...

417 26, 417 28, 417 53, 417295, F04C 2910

Patent

active

049682180

ABSTRACT:
A method of controlling the air output of a screw compressor, wherein the average air output of the compressor during operation is adapted to air consumption by throttling the flow of suction air or by connecting the compressor alternately to full air output capacity and idle operation capacity. In order to reduce the power consumption of the compressor, the air output is controlled first by throttling the flow of suction air and by simultaneously measuring underpressure in the suction conduit of the compressor. Thereafter the compressor is controlled so as to operate alternately at full air output capacity and idle operation capacity, and the pressure rise rate in the air-pressure network is measured when the compressor operates at full output capacity and the pressure fall rate is measured when the compressor operates at idle operation capacity. The air consumption and the power consumption of the compressor with both ways of control at this particular air consumption level are calculated on the basis of the values so measured. Thereafter the compressor is connected to apply the control with the smaller power consumption.

REFERENCES:
patent: 3119552 (1964-01-01), Thomann
patent: 3860363 (1975-01-01), Silvern et al.
patent: 4201517 (1980-05-01), Ferguson
patent: 4642033 (1987-02-01), Boller
Kompressorikirja, Airila, 1983, pp. 40-45 (no English lauguage translation).
English Language Abstract of Airila, M., "Analytical Research into Throttling Controlling Methods . . . ", 1980.
English Abstract, Airila, M., "Screw Compressors and Compressed Air Receivers . . . ", 1981.

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