关键词: 安全阀, 开启部件, 阀芯, 气体动力学, 模拟

Abstract: With the numerical simulation and the experiment methods, the safety valve overpressure relief process and the gas dynamic problem are studied. The relief valve interior steady flow field of moving parts was analyzed by using the domain decomposition and paths analysis methods, the dynamic force balance, the distribution of velocity and the stress characteristics of the paths in the interior and external flow field were studied as well. The results showed that according to the balance of vertical(Y) direction force, experimental lift data came from total pressure, of which the static force was the main part. The dynamic force was important to the recoil force. The clearance force was balanced. The dynamic force mainly came from the high speed gas in the sealing surface and the disc holder ruffled. The static force was the main part of the valve core lift. The research on balance of horizontal(X) direction force showed that valve core was dynamically balanced, but unbalanced horizontal vibration force may exist in the disc holder, leading to a partial load during the open and return process. This partial load may lead to displacement deviation, flutter, chatter and damage the sealing surface, whether combining the valve core and the disc holder into one element or not. By using the experimental setup and the new sensor, the valve core pressure, lift, lifting height and the data of disc holder in monitoring points were successfully obtained, and the recoil force was calculated. The results showed that the 3D simulation was consistent with the sensor testing data.

Key words: safety valve, opening parts, valve core, gas dynamic, simulation