Sealing Performance of Bionic Striped Mud Pump Piston

Abstract

The mud pump piston is a key part for providing mud circulation, but its sealing performance often fails under complex working conditions, which shorten its service life. Inspired by the ring segment structure of earthworms, the bionic striped structure on surfaces of the mud pump piston (BW-160) was designed and machined, and the sealing performances of the bionic striped piston and the standard piston were tested on a sealing performance testing bench. It was found the bionic striped structure efficiently enhanced the sealing performance of the mud pump piston, while the stripe depth and the angle between the stripes and lateral of the piston both significantly affected the sealing performance. The structure with a stripe depth of 2 mm and angle of 90° showed the best sealing performance, which was 90.79% higher than the standard piston. The sealing mechanism showed the striped structure increased the breadth and area of contact sealing between the piston and the cylinder liner. Meanwhile, the striped structure significantly intercepted the early leaked liquid and led to the refluxing rotation of the leaked liquid at the striped structure, reducing the leakage rate.

Influence of Bionic Pit Structure on Friction and Sealing Performance of Reciprocating Plunger

“…e roughness of cylinder liner is 2.0 μm. e rigidity of cylinder liner and steel core is much higher than that of rubber plunger, which simplified as rigid body with elastic modulus of 210 GPa, density of 7800 kg/m 3 , and Poisson's ratio of 0.3. e rubber is a typical kind of hyperelastic material, and the Mooney-Rivlin model [5,22] is selected, in which the analytical constant C10 is 2.5 MPa, C01 is 0.625 MPa, and the density is 1120 kg/m 3 . e Hex Dominant model selected for the grid division of plunger, cylinder liner, and steel core.…”

“…Reciprocating moving parts are an essential indicator of a country's manufacturing level and account for a large proportion of manufacturing equipment. e plunger is a typical reciprocating moving part and is widely used in various pumping mechanisms, such as plunger pump [1][2][3], concrete pump [4], and drilling mud pump [5,6]. How to reduce the frictional resistance of plunger and improve its sealing performance is a crucial issue to be solved.…”