Air inlet accurate control and sealing monitoring system of centrifugal compressor

Abstract

The invention discloses an air inlet accurate control and sealing monitoring system of a centrifugal compressor. The air inlet accurate control and sealing monitoring system of the centrifugal compressor comprises an air inlet accurate control device and a sealing monitoring device. The air inlet accurate control device comprises a moving detection block and a displacement sensor. An air inlet adjusting device comprises an air inlet barrel and a piston barrel, wherein the piston barrel and the air inlet barrel are in sliding fit in the axial direction through hydraulic drive. A rotating shaftof blades is connected with the piston barrel in a transmission mode, so that the blades synchronously rotate when the piston barrel moves relative to the air inlet barrel in the axial direction. Thedisplacement sensor is fixed relative to the air inlet barrel, and the moving detection block is fixedly arranged on the piston barrel so that the displacement sensor can detect the axial position ofthe moving detection block in real time when the moving detection block moves along with the piston barrel in the axial direction. The sealing monitoring device comprises a pressure guide pipeline anda pressure sensor. The pressure guide pipeline is formed in the air inlet adjusting device or / and a pressure expander, the first end of the pressure guide pipeline communicates with the arrangement position of a sealing part, the second end of the pressure guide pipeline is connected with the pressure sensor, and the pressure sensor is used for monitoring the air pressure value of the arrangementposition of the sealing part in real time.

Description

technical field [0001] The invention relates to a centrifugal compressor, in particular to an air intake precise control and sealing performance monitoring system of the centrifugal compressor. Background technique [0002] Generally, the structural composition of a centrifugal refrigeration compressor includes several parts such as a motor, an impeller, a diffuser, and an air intake adjustment device. Among them, the air intake adjustment device (IGV) is located on the axial air intake side of the impeller, and adjusts the air intake of the impeller by adjusting the opening of the blade (the "air" involved in this case refers to the working fluid). The impeller is rotated and assembled in the diffuser, and the output shaft of the motor is coaxially connected with the impeller. When the centrifugal compressor is working, the impeller is driven by the motor to rotate at a high speed. Through the high-speed rotation, the working fluid entering the impeller from the axial direc...

AI Technical Summary

Problems solved by technology

The deficiencies in the above-mentioned prior art are: 1. Although the gear transmission adjustment can achieve precise adjustment, the mechanism is relatively complicated and the cost is high. Usually, the component price is about 15,000 yuan; 2. The hydraulic drive adjustment is relatively simple in structure and low in cost. Low, only including casting materials and processing costs, usually the component price is less than 4,000 yuan, but the disadvantage is that it can only be fuzzy controlled. Stop action near the volume, unable to grasp its specific opening, that is, unable to achieve accurate required cooling capacity

When the centrifugal compressor is working, suction liquid, surge, clogging, etc. may occur. At this time, the impeller cannot be kept in the center position due to the impact, so it will contact the seal of the impeller and cause wear to it, which will cause the seal to be damaged over time. poor sealing

The existing technology cannot grasp the pressure value at the impeller inlet of the centrifugal compressor in real time when it is running, and when the seal of the impeller deteriorates and the high-pressure working fluid returns, it is also impossible to effectively grasp the pressure change information and notify the staff, resulting in centrifugal The working efficiency of the compressor is greatly reduced, and even has a negative impact on the life of the compressor

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