Research On The Buffer Structure And Flow Field Simulation Of Swashplate Piston Hydraulic Transformer

The system efficiency of the hydraulic drive is improved by the secondary regulation system of the constant pressure network.As a key component of the secondary regulation system of the constant pressure network,the development and application of the secondary regulation system of the constant pressure network is further promoted by the emergence of hydraulic transformers.Because the related technology of hydraulic transformer is not mature enough,the current focus is on the theory and application research of hydraulic transformer.In order to alleviate the noise and vibration in the operation of hydraulic transformer,it is of great significance to study the internal pressure impact of hydraulic transformer.Therefore,this article has done the following work for the internal pressure impact of hydraulic transformer.Firstly,the working principle of the swashplate piston hydraulic transformer is described.Considering the influence of the piston movement and the buffer structure,a mathematical model of the oil pressure gradient in the piston cavity is established.And the pressure characteristics of the oil in the piston cavity and the buffer structure in the buffer zone are analyzed.This provides a theoretical basis for the optimal design of the buffer structure in the following text.Secondly,the pressure change curve of oil in the piston cavity caused by piston movement is analyzed.When the input pressure is 5 MPa,8 MPa and 10 MPa,the ideal pressure change curve caused by the buffer structure is obtained.The basic parameters of buffer structure design are obtained.By comparing and analyzing the pressure drop curves of the triangular groove and the buffer hole,it is determined that the buffer hole structure is used for the optimal design.And the optimal buffer hole structure is obtained.Finally,the internal flow field model of the swashplate piston hydraulic transformer is established when the variable pressure angle is 30°,60°,90° and 101°.Based on the UDF program and dynamic mesh technology,the ANSYS software was used to simulate the process of the piston moving at high speed between different slots.The pressure distribution and velocity distribution cloud diagrams of the flow field inside the piston are obtained.The results show that the buffer hole can achieve a better buffer effect in the variable pressure angle range [0°,101°].Therefore,the buffer hole structure designed in this paper effectively alleviates the vibration and noise problems of the swash plate piston hydraulic transformer,and further promotes the development of the swash plate piston hydraulic transformer technology.Therefore,the vibration and noise problems of the swashplate piston hydraulic transformer are effectively alleviated by the buffer hole structure designed in this paper.Swashplate piston hydraulic transformer technology has been further developed.