Three motor driven single-screw compressor control method

A single-screw compressor and control method technology, applied in machine/engine, pump control, mechanical equipment, etc., can solve problems such as poor effect, no large-scale promotion to the market, etc., and achieve the effect of stepless variable flow regulation and control Reliable, easy-to-control results

Inactive Publication Date: 2019-09-03
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At home and abroad, efforts have been made in the above aspects for many years, but the problem of star wheel wear is still not well solved
In addition, oil-free screw compressors generally use water spray lubrication, but the effect is not good, and there is no large-scale market promotion

Method used

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  • Three motor driven single-screw compressor control method
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  • Three motor driven single-screw compressor control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] see Figure 3-4 , each of the three motors is equipped with a speed sensor, the motors connected to the two star wheels are respectively numbered as the first motor and the third motor, and the motor connected to the screw is the second motor, and the numbers of the speed sensor, the controller and the frequency converter are the same; The speed signals of the first speed sensor and the third speed sensor are analyzed by the first controller, the speed is set in the first controller, and the difference between the speed signals of the first motor and the third motor is analyzed according to the first controller, and according to the difference The signal controls the frequency of the first frequency converter and the third frequency converter to increase or decrease, thereby controlling the speed of the first motor and the third motor; the speed signal of the second speed sensor is analyzed by the second controller, and the second controller and the first The controller...

Embodiment 2

[0040] join Figure 5-6 , install a speed sensor for each of the three motors, the motors connected to the two star wheels are respectively numbered as the first motor and the third motor, and the motor connected to the screw is the second motor, and the numbers of the speed sensor, the controller and the frequency converter are the same; First, set the rotational speed in the second controller, control the frequency of the second inverter, and make the second motor run at the set rotational speed, and the rotational speed signals of the first rotational speed sensor and the second rotational speed sensor are analyzed by the first controller. Get the difference between the speed signals of the first motor and the second motor, and control the frequency increase or decrease of the first frequency converter according to the difference signal, and then control the speed of the first motor; in the same way, the third speed sensor The speed signal from the second speed sensor is an...

Embodiment 3

[0042] see Figure 7-8 , each of the three motors is equipped with a speed sensor, the motors connected to the two star wheels are respectively numbered as the first motor and the third motor, and the motor connected to the screw is the second motor, and the numbers of the speed sensor, the controller and the frequency converter are the same; set The fourth controller analyzes the speed signals of the three speed sensors through the fourth controller, sets the speed in the fourth controller, and feeds back the speed signals of the three motors through the first controller and the fourth controller. The controller analyzes the difference between the speed signals of the first controller and the fourth controller, controls the frequency of the first frequency converter to increase or decrease according to the difference signal, and then controls the speed of the first motor; through the second controller and the fourth controller The controller analyzes the difference between th...

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PUM

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Abstract

The invention discloses a three motor driven single-screw compressor control method. The method includes the following steps that firstly, a screw rod is arranged in a machine shell, two star wheels are symmetrically arranged on the two sides of the screw rod, the screw rod and the two star wheels are independently connected with three motors through couplers correspondingly, the rotating speeds of the three motors are controlled through frequency converters, and the frequency converters are connected with a controller; and secondly, rotating speed sensors are used for measuring the real-timerotating speed of the three motors, rotating speed signals of the three rotating speed sensors are analyzed through the controller, the rotating speed is set in the controller, the difference value ofthe rotating speed signals of the three motors is analyzed according to the controller, increasing or decreasing of the frequency of the frequency converters is controlled according to difference value signals, then the rotating speeds of the three motors are controlled, and synchronous rotation of the three motors is achieved. By means of the three motor driven single-screw compressor control method, flow of a single-screw compressor can be adjusted, stepless variable-flow adjustment is achieved, the compression ratio of the single-screw compressor can also be changed, the control process issimple and convenient, and the control effect is reliable.

Description

technical field [0001] The invention belongs to the field of single-screw compressor control, and in particular relates to a control method for a single-screw compressor driven by three motors. Background technique [0002] Single-screw compressors are a type of positive displacement compressors. The existing single-screw compressors on the market are composed of a cylindrical screw and two symmetrically arranged planar star wheels, which are installed in the casing. The screw groove, the inner cavity of the casing, and the tooth top surface of the star wheel constitute the working volume, and the star wheel is driven to rotate by the screw to complete the suction, compression, and exhaust processes of the single-screw compressor. The single-screw compressor has the advantages of simple structure, no air valve, less wearing parts, small volume, compact structure, convenient maintenance, etc., and because there are two star wheels symmetrically arranged on both sides of the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04C28/08
CPCF04C28/08F04C2270/185F04C2270/205
Inventor 何志龙曲西德韩耀祥吴伟烽邢子文
Owner XI AN JIAOTONG UNIV
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