Study on the fluid flow rule of five-cylinder plunger pump hydraulic end

Abstract

The change of velocity and pressure of flow field in suction and discharge chamber of five-cylinder plunger pump obtained by CFD under maximum and minimum stroke, the results show that: when the stroke is 79 rpm, the internal of pump head will produce pressure holding, and the internal organization of pump head body will be in a fatigue state of high pressure for a long time. When the rotate angle is small, the peak velocity at the gap of valve disc and valve seat reaches 9.60 m/s, which is the orifice jet phenomenon. When the stroke is 299 rpm, the overall velocity curve is relatively stable, but the velocity of fluid flow through the pump head body is larger, and the maximum velocity reaches 18.72 m/s at the bottom corner of valve, it will produce the circumfluence and vortex discharge chamber at the same time, which will cause the increase of vibration of pump head body. So it should use proper punching gear in order to conducive to overall working life of pump. Keywords: Five-cylinder plunger pump, Pressure holding, Orifice jet, Vibration