水液压泵柱塞套变形特性的流固耦合研究

Study on Fluid-Solid Coupling of Deformation Characteristics of Piston Bush in Water Hydraulic Pumps

为实现水液压泵柱塞副的高效密封并自动补偿其磨损间隙,提出了一种柱塞副密封间隙自动补偿结构。通过流固耦合仿真技术研究了不同柱塞套厚度和环形槽宽度下柱塞套在内侧环形流体和外侧环形缝隙流体耦合作用下的变形特性。仿真结果表明,在相同的工作压力、流体域边界条件下,当环形槽宽不变时,随着工程塑料聚醚醚酮(PEEK)材质的柱塞套厚度的增大,柱塞套变形量逐渐减小;当柱塞套厚度不变时,柱塞套变形量随着环形槽宽的增大而增大。建立了柱塞副间隙自动补偿试验系统并进行了初步试验,试验结果和仿真结果基本一致。

To realize the efficient sealing of piston pair within water hydraulic pumps and automatically compensate the wear gaps,an automatic compensation structure for piston pair gaps was proposed.The fluid-solid coupling simulation technology was used to study the deformation characteristics of piston bushs under the coupling of inner annular fluid and outer annular clearance fluid pressure with different piston bush thicknesses and ring groove widths.The simulation results show that,under the same working pressure,fluid boundary conditions and annular groove width,the deformation of piston bush gradually decreases with the increase of piston bush thickness.And the piston bush was made of engineering plastic PEEK.When the piston bush thickness is unchanged,the deformation of piston bush increases gradually with the increase of ring groove width.In addition,a test system for automatic clearance compensation of piston pair was established and preliminary tests were carried out.The experimental results are basically consistent with the simulation data.