Process and a device for increasing the efficiency of compressio

Details Process and a device for increasing the efficiency of compressio Process and a device for increasing the efficiency of compressio

1992-10-19

1994-05-31

Bertsch, Richard A.

Pumps

With condition responsive pumped fluid control

Pressure responsive relief or bypass valve

417309, F04B 4900

Patent

active

053164482

ABSTRACT:
In cryogenic applications a compression device circulates a fluid, such as helium, in a closed cooling circuit. The compression device includes at least one compressor, preferably a helical compressor, with a bypass valve connected in parallel thereto, which serves to decompress the compressed fluid. The suction pressure is measured with a pressure measuring device and is supplied to a control device, which controls the position of a powered valve spool of the compressor and also the position of the bypass valve. In order to achieve a high control performance with small bypass losses for load cases which are hard to predetermine, the positions of bypass valve and power valve spool are adjusted so that a fluid flow flows as a control reserve through the bypass valve and is on the order of a fraction of the total fluid flow.

REFERENCES:
patent: 4080110 (1978-03-01), Szymaszek
patent: 4731999 (1988-03-01), Niemiec
patent: 4750867 (1988-06-01), Hertell et al.
patent: 5137061 (1987-08-01), Deininger et al.
J. Clausen, et al., The Linde-Turborefrigerator For Mr-Tomographs, Advances in Cryogenic Engineering, vol. 35, pp. 949-955, Ed. R. W. Fast, Plenum Press, New York, 1990.

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