Research On All Metal Progressive Cavity Pump Based On Elastic Fluid Dynamic Lubrication Theory

All-metal Progressive Cavity Pump compared to the traditional screw pump in high temperature,corrosion resistance and wear and so has more advantages,This is because all-metal Progressive Cavity Pump stator and rotor materials are made of special steel materials,and the traditional screw pump stator sleeve is made of rubber material,so that in the process of heavy oil mining compared to the disadvantage of all-metal Progressive Cavity Pump,using the oil film thickness of the oil to seal the gap of all metal Progressive Cavity Pump,to play the role of lubrication,reduce the wear of the stator and rotor in all metal Progressive Cavity Pump,So that the efficiency of the all-metal progressive screw pump is further improved and its life is extended.The paper is mainly under the condition of fluid lubrication,the lubrication model of all-metal Progressive Cavity Pump based on Reynold equation,mainly through the introduction of a series of theories,the film thickness equation of all metal Progressive Cavity Pump was established,Then the thickness of the oil film of the all metal Progressive screw pump is solved by using the geometric relation to obtain the optimal oil film thickness.and the optimal oil film thickness is obtained;using solidworks to build the solid model of stator and rotor in all metal Progressive Cavity Pump,and then in its assembly,after successful assembly,interference checking is performed on the assembly,when the stator and rotor assembly without interference,the proof of assembly success;the paper also analyzes the pressure generation rule in the stator and rotor,mainly through the theory and the actual working conditions of all metal screw pump pressure analysis,it can be concluded that all-metal Progressive Cavity Pump may need to analyze the pressure condition of all-metal Progressive Cavity Pump in the actual working condition,To determine whether the all-metal Progressive Cavity Pump can produce enough pressure to lift the oil from the bottom of the hole to the ground.When the all-metal Progressive Cavity Pump three-dimensional solid model built,the fluid structure coupling discrete mesh model of the stator,rotor and fluid of the screw pump is generated by the pre-processing method,The finite element method was used to calculate the oil film density and thickness distribution under the screw rotating extrusion by using the ANSYS dynamic fluid structure coupling method,Thus,the original data can be provided for good lubrication,and the dynamic response results of the rotor stator can be obtained.By establishing the CFD calculation model of the screw pump,the flow velocity of the oil under pressure is calculated,as the initial condition,the fluid structure model of the pump oil is input into the screw pump,through the process of calculation of pump oil pump,can get the whole process for oil pressure rotor stator,the equivalent stress distribution of the whole structure,which can provide original data for design and optimization of screw pump.