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A system and method for automatically controlling the start-up process of a screw refrigeration compressor

A technology of refrigeration compressor and startup process, applied in the direction of machine/engine, etc., can solve the problems of motor stall, compressor overload, overcurrent shutdown, etc., to improve work efficiency, enhance reliability, and high economy. Effect

Active Publication Date: 2020-11-17
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Since the refrigerant is evenly distributed in the entire refrigeration system when the shutdown occurs and the pressure is higher than the suction pressure under standard working conditions, the compressor suction pressure is high, and the compressor load is too large under the fixed internal compression ratio of the screw compressor Problems that cause the motor to stall or shut down due to overcurrent

Method used

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  • A system and method for automatically controlling the start-up process of a screw refrigeration compressor
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  • A system and method for automatically controlling the start-up process of a screw refrigeration compressor

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Embodiment Construction

[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0022] Such as figure 1 As shown, an automatic control system for the start-up process of a screw refrigeration compressor includes a screw compressor unit system and a control system. The screw compressor unit system mainly includes a screw refrigeration compressor 1, a throttle valve 4, a frequency converter 3, and a motor 2 , the control system includes a pressure sensor 5 and a controller 6. In the screw compressor unit system, the frequency converter 3 is installed on the motor 2, the motor 2 is connected to the screw refrigeration compressor 1, and the throttle valve 4 is installed on the suction pipeline of the screw refrigeration compressor 1. In the control system, the pressure sensor 5 is installed on the suction pipeline between the throttle valve 4 and the screw refrigeration compressor 1, and the controller 6 is connected with the pressure senso...

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Abstract

The invention discloses a starting process automatic control system and method for a screw rod refrigeration compressor. The system comprises a screw rod compressor set system and a control system, wherein the screw rod compressor set system comprises a frequency converter, the frequency converter is installed on a motor, the motor is connected with the screw rod refrigeration compressor, the airinlet of the screw rod refrigeration compressor is connected with a suction pipeline, and the suction pipeline is provided with a throttle valve; the control system comprises a pressure sensor, wherein the pressure sensor is arranged on the suction pipeline between the throttle valve and the screw rod refrigeration compressor; and the pressure sensor, the throttle valve, the frequency converter are connected with a controller through electric signals. According to the starting process automatic control system and method for the screw rod refrigeration compressor, when the screw rod refrigeration compressor begins to run, the opening degree of the throttle valve and the frequency of the frequency converter are simultaneously adjusted, so that the problems generated during the starting process can be solved.

Description

technical field [0001] The invention relates to the technical field of screw compressors, in particular to an automatic control system and method for the start-up process of a screw refrigeration compressor. Background technique [0002] Due to the advantages of compactness, high efficiency, high reliability, and strong adaptability, screw refrigeration compressors have become an advantageous choice for medium and high-flow refrigeration systems, and their market share has increased year by year. [0003] The working cycle of the screw compressor can be divided into three processes: suction, compression and exhaust. As the rotor rotates, each pair of intermeshing teeth completes the same working cycle successively, and the internal compression ratio is constant without an adjustment mechanism. When the screw refrigeration compressor is stopped, since all components in the refrigeration system are connected through pipelines and there is no power source, the entire system, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04C28/06
CPCF04C28/06
Inventor 孙时中王莹邢子文张震
Owner XI AN JIAOTONG UNIV
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