Research On Key Technology Of A Double-acted Water Hydraulic Vane-type Pump

Double-acted water hydraulic vane-type pump is an important element with speciallyapplication potential, due to its excellent advantages such as the high ratio of power toweight, compact structure, smooth flow, low vibration noise, small rotor inertia andbalanced radial load. However, the development and application are hindered by someunsolved key technical problems such as coupled friction pairs, large PV value of the mainfriction pair, more leakage paths, bad water lubrication characteristics, severe cavitationand acute water hammer phenomenon. This dissertation aims to investigate the keytechnologies and step to the prototype of a vane-type pump based on the parameters of21MPa working pressure,1500r/min rated speed and10mL/r rated displacement.The general structural scheme is designed, and the pump’s design is completed basedon the conclusion of all kinds of oil/water vane-type pump both abroad and home. Theport plates are adopted in this pump, and the compensation of the clearance and controlledfrictional wear is realized through slim deformation of the flexible port plate. Coupledfrictional pairs are decoupled by combining the30%carbon reinforcedPolyetheretherketone (PEEK) and metal. Basic parameters and7-order polynomial curvesfor transition area of the stator are calculated. Proportional pressure reducing valve with apressure ratio of0.51is designed. The strength of the vane-rotor pair is checked throughfinite element method.Structural parameters of the silencing grooves are optimized through pressure and itsgradient mathematic model, which is based on the transition part of the pump. Researchresults indicate that the weight factors of both pressure and its gradient have marginaleffort on optimization and larger angle of the silencing groove is beneficial to theperformances of pressure transition. After the optimization and comparison of varioussilencing grooves, optimized U-type and triangular grooves are set to the high and lowpressure port plate respectively. Besides, the method of discontinuous grooves is utilizedat the bottom of the vanes, and silencing grooves, which are optimized, are introduced tothose pressure grooves. The contact force between the vanes and stator falls sharply afterthe method is optimized. For reducing the leakage and the frictional wear by suitable deformation of flexibleport plate, the pressure distribution between the port plates, rotor and stator is established.And then the total force is calculated in MATLAB, while the deformation of each portplate is solved in ANSYS. After resetting the area and position of the pressure zones, thedeformation of each port plate satisfies the requirement.The key part of the pump—the pressure reducing valve is manufactured, and itspressure performances and leakage are analyzed and investigated through simulation andexperiment. Research results show that experimental data fit simulation well.All the researches give a useful reference to design of the vane-type pump.