Research On The Surface Texture Sealing Characteristics Of Oil Pump Plunger

Aiming at improving pump sealing characteristics between plunger and pump barrel,the plunger surface is designed a bionic hexagon texture,explores the texture under different working conditions and geometry parameters on the surface of the plunger seal characteristic,obtained the optimal surface texture of geometrical dimension parameters,reveals the sealing mechanism of plunger surface texture processing out of the oil well pump plunger surface texture,the actual sealing effect was verified.Firstly,the conventional pump clearance between plunger and pump barrel sealing simplified three-dimensional model,established a two-dimensional geometric model and fluid mechanics equation,analyses the gap sealing mechanism,influencing factors to explore the characteristics of sealing,at the same time,summarizes the fluid mechanics equation,the numerical method,as this paper chose the Fluent to solve the fluid mechanics equations.Secondly,the surface texture pump seal clearance between plunger and pump barrel model has been simplified,extract the texture of sealing element,fluid mechanics model is established,and respectively explores the pressure,speed,fit clearance,ratio of the unit cell depth,ratio of the transverse and longitudinal,Angle,unit cell number and arrangement mode of plunger texture surface sealing characteristics,the influence of revealed under different working condition and size parameters of the law of plunger seal on the surface of the texture.Thirdly,Fluent was used to simulate and solve the model,revealing the texture seal characteristics of the plunger surface of the pump.The simulation results show that the textured surface plunger is suitable for the static seal of the plunger in the working environment with large clearance value and pressure difference between inlet and outlet.The influence of texture geometric parameters on the ratio of leakage loss is based on the gap value and the pressure difference.When the gap value and the pressure difference between inlet and outlet are large,the ratio of groove depth and groove width have the best matching value,that is,the influence of the two on the ratio of leakage loss is interactive.With the increase of the ratio of transverse/longitudinal,the ratio of leakage shows a decreasing trend.However,when the ratio of transverse/longitudinal is larger than a certain value,the influence of the ratio of transverse/longitudinal on the ratio of leakage decreases.In addition,the sealing performance becomes worse with the increase of the included Angle,but the influence is small.The effect of the number of circumferential elements and the starting position of texture on the sealing performance is similar to that of the ratio of transverse/longitudinal of texture.As the number of circumferential elements,the starting position of texture and the distance from the flow field increase,the ratio of leakage first decreases and then flattens.For the dynamic seal of the plunger,the main and secondary factors are,in turn,clearance value,pressure difference between inlet and outlet of the flow field,and plunger velocity.Moreover,the interaction of all factors has significant influence on the ratio of leakage of the flow field,and there are secondary and tertiary interactions.Finally,the surface texture laser machining device and the testbed for the sealing characteristics of the surface texture of the plunger of the pump have been set up,and the processing and testing methods for the surface texture of the plunger of the pump have been realized.The test results show that the influence trend of the actual test is consistent with that of the simulated test.It is concluded that there is an optimal matching value between the groove width and the groove depth of the texture for the plunger of the large-clearance pump with high pressure difference on the texture surface.