Control method of helium screw compressor

Abstract

The invention provides a control method of a helium screw compressor. The control method comprises a compressor loading and unloading operation method, a compressor frequency control method and a compressor unit protection method. The compressor loading and unloading operation method is used for realizing loading and unloading operation of the helium screw compressor by a central control room of a large-sized cryogenic system, and is mainly used for sequentially controlling the loading and unloading of a compressor unit instead of taking air suction pressure or air exhaust pressure of the compressor unit as control parameters of loading and unloading a compressor in the operation process of the compressor unit. The frequency of the compressor in the operation process of the whole cryogenic system operation process is controlled by adopting the compressor frequency control method so as to control the flow of helium in the cryogenic system. The compressor unit is protected by adopting the compressor unit protection method, and damage of unit equipment such as a mainframe in an emergency is prevented by adopting the compressor unit protection method. Therefore, reliable operation of the whole cryogenic system can be ensured.

Description

technical field [0001] The invention belongs to the technical field of refrigeration, and in particular relates to a control method of a helium screw compressor. Background technique [0002] The development of helium screw compressors has been developed with the development of large helium cryogenic systems. In recent years, under the impetus of large scientific projects, large-scale helium cryogenic systems have developed rapidly in China. Helium oil-injected screw compressors have gradually grown to a certain scale from the few domestic ones at the beginning. As a kind of oil-injected screw compressor, the helium screw compressor differs from ordinary air oil-injected screw compressors and conventional refrigerant screw compressors in that the helium working medium is easy to leak and the entire compressor unit on the process control method. Conventional air screw compressors and refrigerant compressors use the same control method, but helium screw compressors are diff...

AI Technical Summary

Problems solved by technology

Conventional air screw compressors and refrigerant compressors use the same control method, but helium screw compressors are different, because if the helium screw compressor uses the same control method as the conventional screw compressor, it will be different from the entire large The control methods of the helium cryogenic system conflict, causing control confusion, which leads to the shutdown of the entire system and control failure

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