The Research On Poppet Valve Vibration Based On Thermal Effects

Hydraulic cone valve due to its good sealing, simple structure, hoist and good characteristics, widely used in cartridge valves, relief valves, check valves and other hydraulic valve pressure, flow and direction of the hydraulic system used to control and so on, become an important basis for the hydraulic system components. But the cone valve appear in the actual project spool due to vibration caused by pressure fluctuations, noise, etc. cavitation phenomenon, so that the control accuracy of the system decreases, and even cause damage to system components, which severely restricted the application. In recent years, with the degree of automation of hydraulic plug continues to improve, the number of applications has increased dramatically hydraulic components, hydraulic cone valve performance requirements for greatly increased. Vibration of Hydraulic cone valves, cavitation is necessary.Mainly due to the diversity of the cone valve, thus causing the cone valve vibration is different. Research paper cone valve vibration Cartridge for structural changes caused by taking into account the cone valve vibration and thermal effects of different structures at different temperatures under cavitation caused by vibration of the poppet valve.This thesis consists of four parts:(1) the computational fluid dynamics (CFD) to calculate steady-state, three in the form of hydraulic cone valve structure analysis, the analysis found that the traditional hydraulic power calculation formula in the complex structure of the cone valve the inaccuracies. Hydraulic system established in ARMsim dynamic response model, the simulation under different spool cone angle, the dynamic response characteristics of the cone valve poppet valve spool found cone cone angle smaller cone valve dynamic response characteristics, the better.(2) design and manufacturing experiment cone valve, establish experimental platform for different cone angle of the cone valve spool spool experiments were carried out at different pressures and different traffic cone valve spool draw smaller cone angle, cone valve response time the shorter, smaller overshoot, better dynamic response characteristics, resulting in the same analysis and simulation results verify the accuracy of the simulation analysis.(3) Research on the effects of hydraulic cone valve work process temperature on the traffic cone valve found to affect the flow of hydraulic fluid in the system overall temperature, viscosity changes caused by temperature changes and thus affect the flow characteristics of the cone valve. For while there exist two typical chamfered valve port tapered valve port and gradually open the valve port temperature impact analysis found that temperature changes gradually open the valve port flow characteristics influence coefficient.(4) of the valve cone for analysis of cavitation, cavitation was found mainly in the low pressure region downstream of the orifice, fluid viscosity changes due to temperature changes affecting the extent of cavitation, the smaller the viscosity of the more intense the degree of cavitation. For a typical two-port valve port valve, temperature, tapered valve port has an inhibitory effect on cavitation.