Optimization Design of Symmetrical Triangular Damping Groove for Bidirectional Axial Piston Pump
The high and low pressure switching of the axial piston pump is realized by the structure of the valve plate,and the buffer groove structure on the valve plate is very important to reduce the pressure shock and flow fluctuation.In order to optimize the structural parameters of the buffer tank of the bidirectional piston pump,the influence of the triangular groove structure on the outlet pressure-flow characteristics was analyzed,and the pressure-flow characteristics of the piston pump under the single buffer groove structure were calculated,and the optimal configuration was obtained.Firstly,the relationship between the configuration of the triangular buffer tank and the output pressure and flow characteristics of the pump is analyzed theoretically.The pressure and flow characteristics of the whole pump flow field with unidirectional triangular groove structure are calculated by CFD method,and the influence law of the structural parameters of the buffer tank and the outlet flow pulsation characteristics is studied.Secondly,the flow field characteristics of unidirectional and symmetrical triangular buffer groove structures are calculated,and the influence of buffer groove structure on the flow distribution characteristics under the forward and reverse conditions of the piston pump is explored.Finally,the optimized structural parameters of the buffer tank are calculated by multi-objective optimization algorithm,and the pressure flow pulsation at the outlet of the piston pump is reduced.The results show that for the piston pump structure that needs to deal with the positive and negative rotation conditions at the same time,the plate buffer groove structure should adopt the axisymmetric configuration,and the structural parameters of the front and rear triangular grooves should be consistent,which will help to obtain more stable pressure flow characteristics.After optimization,the width angle of the front and rear triangular grooving is 82.3°,the depth angle is 12.7°,the optimized pressure pulsation rate is 0.3％,and the optimized flow pulsation rate is 13.7％.
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