Design And Theoretical Research On Double-acting Water Hydraulic Vane Pump With High Pressure

Double-acting water hydraulic vane pump has broad application prospects，due to itsexcellent advantages such as smaller flow pulsation, lower noise, great ratio betweenpower and weight, balanced radial load. But the development of high-pressure waterhydraulic vane pump is also facing a number of technical difficulties: large PV value offriction pair, serious leakage and so on. These technical difficulties are the main obstaclesto the development and application of water hydraulic vane pump. This article aims atinvestigating the key technologies of a vane-type pump based on the parameters of ratedspeed1500r/min, the theoretical displacement30mL/r, rated pressure16MPa.Firstly, the structure of the common high-pressure hydraulic vane pumps werecompared, then the program which used the vane with circular top structure and thepressure-reducing valve was proposed. Then the overall structure of the vane pump wasdesigned. The30%carbon reinforced PEEK and stainless steel were used as the mainfrictional pairs based on the hydraulic component design experience. Two kinds of vanestructure were analyzed based on the finite element simulation and process performance,and the structure with metal matrix wrapped in enhanced PEEK was selected finally.In order to reduce the friction and wear between the cam ring and the vane tips, theprogram that low PV value of all phase for vane pump was completed. Through theestablishment of pressure differential equation in transition zone, three kinds of silencinggrooves were optimized based on the genetic algorithm. Optimized triangular groove andtriangular-rectangular groove were set to the booster and unloading process respectively.Pressure-reducing valve and constant flow-differential pressure controller，two controlprograms of bottom pressure of the vanes at the pump suction zone，were proposed. Andthey were carried out simulation and optimization of structural design and the valve portstructures, the final choice was using constant flow-differential pressure controller. Theforces acted on the vanes were calculated, and the contact forces and PV value were keptsmall all around the phase angle.Flexible port plate structure was used to reduce the leakage between the valve plateand the rotor. The thrust acted on the port plate was calculated by using formula based onlaminar flow and CFD simulation of flow. Research shows that there is a big difference between the results of the two methods. Considering the complexity of the flow fielddistribution of plane, the CFD simulation method was finally chosen. The deformation andstress of the port plate were simulated in ANSYS, which meet the design requirements.