Research On Lubrication Characteristics Of Floating Ring Bearings Of High Pressure Piston Pump

As an important part of the high-pressure plunger pump,the floating ring bearing plays a very critical role in the normal operation of the marine diesel engine.generated force.Compared with ordinary sliding bearings,floating ring bearings form a double oil film between the moving surfaces due to the addition of a bushing between the journal and the bearing bush,which reduces the friction loss between the bearings and optimizes the lubricating performance of the bearing.In this paper,based on the CFD numerical calculation method,the lubrication characteristics of the floating ring bearing are studied,and the floating ring bearing is simulated and analyzed in the FLUENT software,and the variation law of the bearing capacity of the floating ring bearing oil film and other related characteristics is obtained.Compared with the traditional solution of Reynolds equation,this method not only shortens the calculation time,but also can simulate and analyze the actual lubrication boundary conditions more accurately and realistically.The specific research contents are as follows:(1)First divide the high-quality mesh of the floating ring bearing oil film in ICEM,and guide it in FLUENT.Enter the custom UDF dynamic mesh program to solve the simulation,and analyze the surface pressure distribution and surface temperature distribution of the inner and outer oil film of the floating ring bearing under the three conditions of different rotational speeds,different inlet oil pressures,and different internal and external clearance ratios.The results show that the higher the rotation speed of the rollers,the higher the surface pressure of the oil film.The oil inlet pressure has little effect on the distribution of the oil film pressure,and the gap ratio of the inner and outer oil films has a great influence on the distribution of the oil film pressure.(2)Using the method of orthogonal experimental design,the structure optimization analysis of the floating ring bearing of the high-pressure piston pump is carried out.The influence of different bearing structural parameters on the oil film bearing capacity is evaluated,the corresponding maximum oil film bearing capacity is obtained,and the optimal combination parameters are finally selected.(3)Using the fluid-structure interaction analysis method,load the fluid data calculated by FLUENT simulation into the bushing.The structure is analyzed,and the stress change of the bushing structure under the action of the oil film force is obtained.The simulation results show that under the action of oil film force,the maximum stress value of the structure is less than the allowable stress of the material,which meets the strength requirements.(4)The cavitation phenomenon produced by the oil film in the actual lubrication is analyzed,and the orthogonal experimental design 9.The oil film model is used to compare and analyze the cavitation volume,and it is verified that the oil film has the smallest amount of cavitation under the optimal combination.(5)For the floating ring bearing in the low-speed diesel engine,based on the combination of theory and simulation results,the roller pin is verified by the durability test.The test shows that the surface wear of the optimized roller pin is significantly lighter than that before the optimization,which proves the correctness of the method and provides a certain reference value for the performance improvement of the floating ring bearing.