Process and a device for increasing the efficiency of compression devices
First Claim
1. A process for increasing the efficiency of a compressor having a suction line as an input, a pressure line as an output and a counter-pressure valve wherein the compressor compresses a fluid, the process comprising the steps of:
- bleeding fluid from the pressure line to the suction line through a bypass valve disposed in parallel with the compressor;
monitoring the pressure in the suction line to provide a first signal indicative of the actual pressure in the suction line; and
comparing the first signal to a second signal indicative of a desired suction line pressure to produce a first error signal for controlling the size of the opening of the counter-pressure valve in the compressor which counter-pressure valve controls the suction pressure, and providing a second error signal which controls the size of the opening of the bypass valve, wherein fluid flow between the suction and pressure lines is adapted to the requirements of the cooling process while maintaining the suction pressure substantially constant.
1 Assignment
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Accused Products
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.
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Citations
10 Claims
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1. A process for increasing the efficiency of a compressor having a suction line as an input, a pressure line as an output and a counter-pressure valve wherein the compressor compresses a fluid, the process comprising the steps of:
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bleeding fluid from the pressure line to the suction line through a bypass valve disposed in parallel with the compressor; monitoring the pressure in the suction line to provide a first signal indicative of the actual pressure in the suction line; and comparing the first signal to a second signal indicative of a desired suction line pressure to produce a first error signal for controlling the size of the opening of the counter-pressure valve in the compressor which counter-pressure valve controls the suction pressure, and providing a second error signal which controls the size of the opening of the bypass valve, wherein fluid flow between the suction and pressure lines is adapted to the requirements of the cooling process while maintaining the suction pressure substantially constant. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A process for increasing the efficiency of the compressor having a suction line as an input, a pressure line as an output and a counter-pressure valve wherein the compressor compresses a fluid, the process comprising the steps of:
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bleeding fluid from the pressure line to the suction line through a bypass valve disposed in parallel with the compressor; monitoring the pressure in the suction line to provide a first signal indicative of the actual pressure in the suction line; comparing the first signal to a second signal indicative of a desired suction line pressure to produce a first error signal for controlling the size of the opening of the bypass valve; and using the first error signal to generate a second error signal for controlling the size of the opening of the counter-pressure valve by comparing the first error signal to a desired error signal to produce the second error signal. - View Dependent Claims (10)
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Specification