Method of acquiring pressure pulsation of valve cavity of reciprocating type piston compressor

Abstract

The invention belongs to the field of compressors and discloses a method of acquiring pressure pulsation of a valve cavity of a reciprocating type piston compressor. The method comprises the followingsteps: establishing an ordinary differential equation set by means of a compressor working process equation, a valve block kinematic equation and a valve cavity pressure pulsation equation; and solving the equation set to acquire a time-dependent numerical solution of the pressures of suction and exhaust valve cavities. A mathematical model of the compressor working process is established on a theoretical basis of an energy conservation law and a mass conservation law of a variable mass thermodynamic system and an ideal gas state equation and a volumetric equation, so that the time and the test cost can be saved; by comprehensively considering the compressor working process, the motion law of an air valve and mutual effect between pressure pulsation in the suction and exhaust valve cavities and a pipe system, the valve cavity pressure pulsation acquiring method is higher in precision and is closer to the actual condition. In addition, the analytical method for acquiring the valve cavity pressure pulsation can carry out optimized analysis on compressor parameters, valve block parameters, valve cavity parameters and pipeline parameters to control the lowest pressure pulsation.

Description

technical field [0001] The invention belongs to the field of compressors, and more specifically relates to a method for obtaining pressure pulsation in a valve cavity of a reciprocating piston compressor. Background technique [0002] Reciprocating piston compressors have the characteristics of wide pressure range and strong applicability, so they are widely used in petrochemical and other fields. It is extremely important for application enterprises to ensure their reliable operation. The strong vibration of the pipeline has a great impact on the performance and reliability of the compressor. Most of the vibration encountered in production is caused by air flow pulsation, while the air flow pulsation in the intake and exhaust chambers and connecting pipes of piston compressors is caused by the intermittent air valve. caused by air intake or exhaust. It is of great significance to study the mechanism of airflow pulsation, establish a reasonable mathematical model of airflow...

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Problems solved by technology

[0004] However, in the current analysis of the air flow pulsation of the compressor, some assume that the pressure of the valve chamber is constant, and think that there is no pulsation. The opening and closing of the valve is considered to be instantaneous. During the opening of the valve, the speed of the air flow at the end of the valve chamber is proportional to the piston speed. This undoubtedly omits the influence of the movement of the valve plate on the movement of the air flow, which will reduce the obtained results. the accuracy of

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