Thermal-Pressure Coupling Characteristics of Plunger Pair in Ultra-high Pressure Plunger Pump
In order to investigate the influence of the thermal-pressure characteristics of the plunger pair on the sealing perform-ance of the plunger,a thermal dominant model and a thermal-pressure coupling model were established based on the heat-fluid-solid coupling,combining the viscous-temperature-viscous-pressure effect,the clearance deformation and the leakage rate of the fluid in the clearance were analyzed under different loading pressures.The results show that the maximum clearance of the plunger pair occurs at the inlet of the clearance,which is only affected by pressure deformation and is not related to thermal,and the minimum clearance of the plunger pair occurs about 1/10 from the outlet of the clearance,the thermal deformation effect is about 80%and pressure deformation effect is about 20%;under the thermo-pressure coupling model,the maximum clearance of the plunger pair increases with the increase of the loading pressure,the minimum clearance decreases and the risk of seizing increases;the clearance compensation modified method of the plunger busbar can improve the problem of plunger pump deformation,which can effectively solve the seizing problem of the plunger pair outlet end.
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