Control method of helium screw compressor

A technology of screw compressors and control methods, applied to compressors, irreversible cycle compressors, refrigerators, etc., can solve problems such as control confusion, system shutdown, and different helium screw compressors, and achieve the effect of ensuring reliable operation

Active Publication Date: 2017-07-25
北京中科富海低温科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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 convention

Method used

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  • Control method of helium screw compressor

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Embodiment Construction

[0018] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0019] see figure 1 , the control method of the helium screw compressor of an embodiment, comprises the steps:

[0020] S10. After the helium screw compressor is started by the central control room of the helium cryogenic system, the helium screw compressor starts to run from 0Hz to the starting frequency of the helium screw compressor, and runs stably at the starting frequency, wherein the starting frequency is determined by the central control room remote settings.

[0021] S20. During the stable operation of the helium screw compressor, when the flow rate in the helium cryogenic system needs ...

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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...

Claims

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Application Information

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IPC IPC(8): F25B49/02F25B1/047F25B9/00
CPCF25B1/047F25B9/002F25B49/022F25B2600/026
Inventor 王炳明胡忠军李静龚领会
Owner 北京中科富海低温科技有限公司
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