Effect of rubber Poisson's ratio on lifting performance of equal wall thickness progressive cavity pumps
In order to study the effect of rubber Poisson's ratio on the lifting capacity of single screw pump with constant wall thickness,finite element simulation and experimental study were carried out.Firstly,the Workbench software was used to simulate the contact nonlinearity of the constant wall thickness single screw pump,and the relationship between the differential pressure load and the contact stress under different cavity pressures was studied.The calculation method of the critical sealing pressure between the cavities was summarized,the critical sealing pressure of the constant wall thickness single screw pump under different rubber Poisson's ratio was calculated,and the polynomial fitting was carried out by using Origin software.Then,the relationship between the rubber Poisson's ratio and the critical sealing pressure between the cavities was analyzed.According to the internal oil pressure transmission law of single screw pump with equal wall thickness,the pump head under different rubber Poisson's ratio was calculated,and the relationship between them was analyzed.Finally,in order to verify the correctness of the contact nonlinear simulation results of the single screw pump with equal wall thickness,the hydraulic characteristics of the screw pump were tested.The research results show that the contact stress between the cavities increases linearly with the increase of pressure difference load,and decreases with the increase of cavity pressure.The critical seal pressure between the cavities is approximately non-linear with the increase of the cavity pressure.When the pressure of the cavity is constant,the critical seal pressure between the cavities increases with the increase of the Poisson's ratio of rubber.The greater the Poisson's ratio,the less likely it is to leak inside the same wall thickness single screw pump.The head of screw pump increases nonlinearly with the increase of rubber Poisson's ratio,and the growth rate is faster and faster.In the test,the maximum head of screw pump with equal wall thickness is 10.85 MPa,the error between simulation results and experimental results is only3.2%.The above research results can provide reference for the future research of equal wall thickness single screw pump.
positive displacement pumphydraulic characteristics of screw pumpcritical sealing pressurePoisson's ratio for rubberhead liftoil conduction lawseal characteristic analysis
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