Air valve leakage state evaluation method and system based on vibration signals

Abstract

The invention belongs to the technical field of reciprocating compressor state monitoring, and discloses an air valve leakage state evaluation method and system based on a vibration signal. The methodcomprises the following steps: obtaining a vibration acceleration signal of an air valve of a reciprocating compressor and a flywheel key phase signal collected synchronously with the vibration acceleration signal; dividing the vibration acceleration signal according to the flywheel key phase signal and the crankshaft period of the reciprocating compressor, and converting the vibration acceleration signal from a time domain to an angle domain to obtain a plurality of crankshaft period signals; obtaining a plurality of first evaluation values according to the crankshaft period signals; according to the actual opening phase of an exhaust valve and the opening phase of the exhaust valve in a preset health state, obtaining an exhaust valve phase change index as well as multiple second evaluation values; and evaluating the leakage state of the air valve according to the plurality of first evaluation values and the plurality of second evaluation values. And the monitoring method is simple,has no safety risk, and is easy to popularize and apply in an industrial field.

Description

technical field [0001] The invention belongs to the technical field of condition monitoring of reciprocating compressors, and relates to a vibration signal-based method and system for assessing the leakage condition of an air valve. Background technique [0002] Reciprocating compressors are general-purpose mechanical equipment that can compress almost all gases under a large pressure range, and have a wide range of power options to flexibly adapt to a wide range of capacity and working conditions. Therefore, reciprocating compressors are widely used in various industrial sites as key equipment, especially in process industries such as petroleum and chemical industry. Different from the rotary motion of the centrifugal compressor, the reciprocating motion of the reciprocating compressor is a typical non-stationary process. The structure of the reciprocating compressor is complex and there are many parts. Therefore, it is extremely prone to failure. Among them, the air valv...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the existing gas valve leakage state evaluation method in the above-mentioned prior art, which requires intrusive monitoring of the real-time dynamic pressure in the cylinder, and there is a risk of dangerous gas leakage, which has great potential safety hazards and is difficult to popularize and use. Disadvantages, provide a vibration signal-based method and system for evaluating the state of valve leakage

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