6M25压缩机气缸活塞运动可靠性

Reliability of 6M25 Compressor Cylinder Piston Motion

气缸活塞可靠运行是压缩机正常工作的必要条件。论文运用机构运动误差分析理论，推导了零件尺寸具有正态分布特征的气缸活塞机构运动可靠度的计算公式，以6M25压缩机气缸活塞为对象，对活塞运动过程中的位移可靠度进行了计算。计算结果表明：活塞位移可靠度是压缩角α（曲柄轴向与活塞运动轴线夹角）的函数；在一个活塞运动周期内，活塞位移可靠度的变化范围为0．9920—0．9994；在活塞的吸气过程中，当压缩角α从0°增大至90°时，活塞位移可靠度随着压缩机的增大而增大，当压缩角αk90°增大至180°时，活塞位移可靠度随着压缩机α的增大而减小；在活塞压缩气体过程中，当压缩角α从180°增大至360°时，活塞位移可靠度随着压缩机α的增大而增大；活塞处于上止点时，活塞的位移可靠度最大，活塞处于下止点时，活塞的位移可靠度最小。

Reliable operation of cylinder piston was necessary condition of compressor working normally. Mechanism moving error calculation method was used in this paper to deduce the calculation formulas for mechanism moving reliability of cylinder piston while the component size with normal distribution characteristics. Take 6M25 compressor cylinder piston for example, piston displacement reliability in moving process was calculated. Calculation results show that piston displacement reliability is function of compress angle （angle of crank axis and piston movement axis）. Piston displacement reliability variation range is 0.9920-0.9994 in a piston moving period. During piston suction process, piston displacement reliability is increased with compress angle increasing while is increased from 0°-90°, piston displacement reliability is decreased with compress angle increasing while is increased from 90°-180°. During piston compressing process, piston displacement reliability is increased with compress angle increasing while is increased from 180°-360°. Maximum of piston displacement reliability is occurred at top dead center of cylinder, and minimum of piston displacement reliability is occurred at bottom dead center of cylinder.