Composite Magneto-Electric Spring-Operated Direct Acting Relief Valve Characteristics Study

The relief valve serves as an indispensable and important pressure control valve in hydraulic systems,providing stable,rated,and safe pressure fluid to the system while also stabilizing pressure relief and functioning as a safety valve.Springs are important components in overflow valves,and the performance of the springs directly affects the pressure characteristics of the overflow valve and even the entire hydraulic system.The mechanical spiral spring is commonly used in the pressure regulation,pre-tensioning,and reset functions of existing overflow valves.However,due to the original properties of the material and the influence of the process during processing,the mechanical spiral spring is prone to stress relaxation and fatigue fracture during long-term and high-frequency periodic work,seriously affecting the response characteristics and service life of the overflow valve.Compared with mechanical spiral springs,Composite magneto-electric spring has the advantages of remote control,large air-gap magnetic force,fast response speed,and no frictional wear,and are not prone to stress relaxation and fracture problems because they use magnetic field transmission and have no direct contact.Applying Composite magneto-electric spring to overflow valves to replace traditional mechanical springs can solve the problems of stress relaxation and fracture of springs,improve the pressure control characteristics of overflow valves,and extend the service life of overflow valves.The paper mainly focuses on the following research contents:A composite magneto-electric spring-operated direct acting relief valve was designed,and Maxwell magnetic simulation software was used to design and analyze some complex parameters of the composite magneto-electric spring to study the effect of current size,structural dimensions,permanent magnet thickness,and air gap size on the magnetic force of the composite magneto-electric spring in the hydraulic environment.Based on the simulation set parameters,a test platform was built to test the effect of turns and air gap size between the springs on the magnetic force of the composite magneto-electric spring.The simulation and experimental results show that the magnetic force of the composite magneto-electric spring increases with the number of turns and decreases with the increase of air gap,and increases with the increase of permanent magnet thickness.The AMESim hydraulic simulation software was used to establish the HCD simulation model of the composite magneto-electric spring-operated direct acting relief valve and the mechanical spring direct acting relief valve.The flow rate characteristics and dynamic response characteristics of the two relief valves under different set pressures from opening to reaching rated flow were analyzed.Based on the relief valve performance test circuit principle,a relief valve performance test platform was established and tested.Finally,the experimental results were compared with the simulation data and summarized.The simulation and experimental results show that under the same set pressure,the composite magneto-electric spring-operated direct acting relief valve has smaller pressure deviation and overshoot.Compared with the mechanical spring direct acting relief valve,the composite magneto-electric spring-operated direct acting relief valve has higher pressure regulation accuracy and faster response speed.