高能效电液系统用高速柱塞泵关键技术研究OA

With the widespread application of high-speed motors,electro-hydrostatic actuator impose high-speed requirements on piston pumps.We focus on a 60 ml/r swashplate variable-displacement axial piston pump and conduct a high-speed redesign.We address issues such as large pressure pulsations in the piston chambers,poor suction performance,and severe cavitation at high rotational speeds.An integrated booster impeller is designed inside the pump to increase the suction pressure of the piston chambers and to solve the insufficient oil intake problem.A pre-depressurization chamber is added to reduce negative pressure overshoot during high-to-low pressure transitions thereby mitigating cavitation risks.The port plate relief grooves are optimized by configuring the pressurization zone with damping holes and triangular grooves and the depressurization zone with damping holes and U-shaped grooves.The optimization of the port plate damping grooves reduces pressure pulsation during pressure transitions.The proposed design is validated through CFD flow-field simulations.A prototype of the high-speed piston pump is developed and experimentally tested.Testing results show good agreement with the simulation results.The prototype reaches a maximum rotational speed of 5000 r/min,and its volumetric efficiency exceeds 96%under load pressures of 5～15 MPa within the speed range of 1000～5000 r/min.