Structural Design And Performance Analysis Of Combined Relief Valve

As an important component of the pressure control system,the relief valve has always been a hot spot and focus in the field of hydraulic control because of its excellent pressure regulation and relief performance.Based on the pressure regulation principle and structure of the traditional pilot-operated relief valve,this paper proposes a pressure-regulating pressure-limiting relief valve with functions of stabilization,pressure regulation and pressure limiting.Because it has a three-stage pressure regulation function in terms of pressure regulation,it has better voltage regulation adaptability and pressure regulation ability when dealing with complicated actual engineering hydraulic control systems.In addition,the unique pressure limiting valve pressure of the pressure regulating pressure limiting relief valve acts on the tail end of the pressure regulating spool to cooperate with the structure of the pressure regulating valve to stabilize and absorb vibration,so that the pressure regulating spool is in the process of pressure regulating and overflowing.More stable,more accurate voltage regulation accuracy.Pressure regulation response speed,regulation accuracy and static and dynamic characteristics are all key criteria for evaluating the performance of pressure regulation and pressure limiting relief valves,so the exploration of its opening and closing characteristics is extremely important.Next,the research and analysis will be carried out with the pressure regulating and pressure limiting relief valve as the research object.First,determine and improve the specific structure of the new relief valve,design and calculate the main structural dimensions of the pressure regulating valve and pilot valve,and introduce the working principle and structural characteristics of the new relief valve in detail.On the basis of the existing dynamics,the calculation equations of the hydraulic power,momentum flux,spool balance equation and spool mechanics equation of the cone spool and the lower part of the pressure regulating spool are derived.The supravertebral groove establishes a leakage model.By dividing the pressure nodes and flow nodes in the leakage gap,the calculation equations of laminar flow gap and leakage flow are deduced and the overflow valve is statically analyzed.Then,according to its working principle and calculated structural parameters,two-dimensional simulation modeling of the pressure regulating pressure limiting relief valve is carried out in the simulation software,and the simulation parameters are set On the basis of the same simulation parameters,compared with ordinary pilot-operated relief valves,the dynamic performance of the spool quality change,spring stiffness and orifice size is analyzed,and it is concluded that the orifice size has a significant effect on the dynamic characteristics of the relief valve.Great influence,the proportional spring stiffness will increase the pressure relief range.Finally,in ANSYS,different analysis modules are used to simulate the flow of the pressure regulating spool at different liquid inlet speeds and different valve openings.In order to make the analysis data more realistic,combined with the excellent fluid-structure interaction dynamics of FSI(Fluid-Structure Interactio n),the spool vibration caused by fluid impact is simulated and analyzed,and the spool displacement and inlet velocity are the main research objects.,The fluid-solid coupling analysis in the pressure regulating process found that the smallest eddy current in the matching cavity of the pressure regulating valve core is characteristic.The thesis carried out theoretical calculations on the static and dynamic characteristics of the pressure-regulating and pressure-limiting relief valve,and obtained the simulation results in the software,which laid the foundation for the in-depth exploration of its performance in the future.Figure[46]table[2]reference[80]...