泥浆泵中的各种密封件都在含有大量磨励性颗粒的高压液体中工作,最容易损坏,是泥浆泵的薄弱环节,尤其是活塞。泥浆泵活塞的一般结构是在金属活塞芯子的两端套上略带锥度的天然或人造橡胶皮碗(以下简称“皮碗”)。皮碗的底部靠住活塞芯子法兰,唇部面向工作液承受泵压,于是向外膨胀,首先使唇部、然后是全身贴紧在缸套内壁上,起到密封作用。芯子法兰直径比缸套内径略小,故法兰与缸壁之间有一环缝,使两者在相对运动中没有摩擦。由 Various seals in mud pumps work in high-pressure liquids containing a large amount of abrasive particles, which are the most vulnerable and are the weakest part of mud pumps, especially pistons. The general construction of the mud pump piston is to apply a slightly tapered natural or synthetic rubber bowl (hereinafter referred to as “bowl”) to both ends of the metal piston core. The bottom of the cup leans against the flange of the piston core and the lip is subjected to pump pressure against the working fluid. As a result, the lip is expanded outwardly, first of all the lip and then the whole body are tightly attached to the inner wall of the cylinder liner to act as a seal. The diameter of the core flange is slightly smaller than the inner diameter of the cylinder liner, so there is a circular seam between the flange and the cylinder wall so that the two do not have friction in the relative movement. by