diesel slurry pump

Investigation on the wear characteristics of slurry abrasive flow to key passage parts of the pump body

Abstract

The slurry abrasive water jet (S-AWJ) has the advantages of high cutting capacity and simple implementation process. However, the high-pressure slurry abrasive flow generated by pump pressurization causes severe wear on the key passage parts of the pump: the T-tube, valve ball, and valve seat. Therefore, it is significant to study the wear laws and wear mechanisms of high-pressure slurry abrasive flow on these parts. In this paper, firstly, a finite element model was established using Fluent to study the wear law of flow passage parts with different parameters. Secondly, a wear test device was designed and the wear tests were conducted. It was found that the wear rate of the valve ball, valve seat, and T-tube increased with the increase in pump pressure and abrasive concentration and decreased with the increase in abrasive mesh number. Moreover, the wear morphology of the wearing parts was also studied. The surface morphology of the valve ball after wear was mainly lip-shaped pits. The wear position of the valve seat was the chamfer in contact with the valve ball. The main reason for the wear was that the abrasive would accumulate after the contact area changes from the linear sealing to the face sealing. The wear morphology of the T-tube was mainly flaky and dotted craters. Finally, the sensitivity of the wearing parts to different parameters was obtained by orthogonal tests, and the wear model for wearing parts was established. The results of this paper provide a basis for a closer understanding of the wear mechanism of the S-AWJ pump body, as well as future wear reduction solutions.