The Research On Sealing Performance Of The Reciprocating Seals For Waterjet Hydraulic Intensifier

In recent years,high-pressure waterjet technology has been widely used in cutting,cleaning and other fields.As the high-pressure water source of most waterjet systems,the hydraulic intensifier has excellent sealing performance,which greatly affects the output pressure,maintenance cycle and running cost of the waterjet equipment.Therefore,it is quite necessary to research the high-pressure reciprocating seals in the hydraulic intensifier to reduce leakage,friction force and improve its sealing performance,which also have certain practical significance.In this paper,the high-pressure reciprocating seal is taken as the research object,combined with the movement characteristics of the hydraulic intensifier,the sealing mechanism of the seal is analyzed,and the sealing performance of the seal under various working conditions is analyzed by simulation technology,and finally optimizes the section size.Combined with the finite element theory,the finite element model of reciprocating seals is established from two aspects of pressure field and temperature field,and the influence of the deformation of the seal under high pressure on the stress of the seal is considered.The contact pressure of the sealing interface is extracted from the simulation results,the deformation characteristics of the seals under different fluid pressure are compared,and the temperature distribution characteristics of the seals are also studied.Based on the established finite element model,the maximum contact pressure,friction and maximum temperature were used as the evaluation indexes of sealing performance.At the different output pressures of the hydraulic intensifier,we studied and summarized the changes in sealing performance under various other conditions,such as the input flow rate of the hydraulic intensifier,the friction coefficient of the dynamic sealing interface,the amount of wear and the amount of compression on the sealing.This provides assistance with the selection of suitable conditions for the use of seals.In order to improve the maximum contact pressure and reduce friction,the design of the inner ring structure of the seal is optimized.Through the orthogonal experiment,the influence of the inner ring lip height,the cone height,the root inner diameter and the overall height of the seal on the sealing performance and the optimal parameter combination are obtained,which provides some theoretical reference for the design of the reciprocating seals.