关键词: 排气阀, 流固耦合, 冲击, 寿命

Abstract: The high-reliability design of compressor discharge valves has always been a challenge in the industry. The exhaust valve was studied using numerical methods and valve disc impact tests. A bidirectional fluid-structure interaction model was established for a 7.5 CC inverter reciprocating compressor under reliable operating conditions, and the impact mechanism of the valve and the stress wave propagation process were studied. The analysis reveals that the key factor affecting the reliability of the valve impact on the valve seat is valve backflow. Additionally, a study on the influence of valve group parameters on reliability was conducted. Simulation results showed that increasing the width of the valve plate by 43% reduced the impact stress by 17%; increasing the length by 12.5% increased the impact stress by 23.8%; and increasing the thickness by 66% reduced the impact stress by 64.7%. The valve port width was validated through valve plate impact tests and simulations. The results indicate that when the valve port width was 0.13 mm~0.53 mm, the simulated stress decreases by 30.3% and the service life increases by 46 times. A sealing port width of 0.4 mm or more meets the requirement of 10 million cycles of service life. These findings can provide theoretical guidance for the future design of compressor valves.

Key words: Exhaust valve, Fluid-Structure Interaction, Impact fatigue, Lifespan