Liquid-driven piston compressor indicator diagram nondestructive monitoring device and method

Abstract

The invention discloses a nondestructive monitoring device and method for an indicator diagram of a liquid-driven piston compressor, and relates to the technical field of liquid-driven piston compressors. The method comprises the steps that circumferential strain data of an air cylinder end cover and instantaneous flow data of oil in an oil way between an oil cavity and an oil pump at the same moment are obtained in real time; the real-time dynamic pressure in the air cylinder and the real-time volume of the air cylinder are obtained through calculation according to the circumferential strain data and the instantaneous flow data which are obtained in real time; and synchronously intercepting the real-time dynamic pressure in one compression period and the real-time volume of the air cylinder, and carrying out dimensionless processing on the intercepted real-time dynamic pressure in one compression period and the real-time volume of the air cylinder to obtain an indicator diagram in the operation process of the compressor. The method is used for monitoring the running state of the compressor in real time.

Description

technical field [0001] The present application relates to the technical field of liquid-driven piston compressors, in particular to a device and method for non-destructive monitoring of indicator diagrams of liquid-driven piston compressors. Background technique [0002] The liquid-driven piston compressor is a type of reciprocating compressor. Unlike the traditional reciprocating compressor, the crank-link mechanism drives the piston to reciprocate, and its reciprocating motion is driven by a hydraulic system. The hydraulic system of the liquid-driven piston compressor injects high-pressure hydraulic oil alternately into both sides of the cylinder to push the cylinder piston to reciprocate, and the cylinder piston drives the piston rod and pushes the cylinder piston to reciprocate in the cylinder. Compared with the traditional reciprocating compressor, the liquid-driven piston compressor has the characteristics of good stability, good sealing, small footprint, low vibration...

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Problems solved by technology

But there is no crank linkage mechanism in the liquid driven compressor, this method is not applicable

Except for the first time, the general displacement can be measured by a displacement sensor, but the pressure in the cylinder of the liquid-driven piston compressor is extremely high, and the traditional displacement sensor is difficult to withstand the high pressure, and it is difficult to solve the leakage problem caused by the installation of the sensor

Therefore, the displacement sensor cannot be used to directly measure the displacement of the piston to obtain the volume

Therefore, there is no practical method for measuring the dynamic volume of the cylinder.

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