Toyo Valve(Shanghai)Co.,Ltd

1 ultra high pressure and large flow valve structure principle
Because of the flow channel area of high flow t pneumatic on-off valve is larger, so the role of Portsmouth in heart valve pressure and power are relatively large, if the use of direct drive structure type, it must adopt large electromagnet, resulting in large size structure; and the response speed of large electromagnetic iron is low, reduces the dynamic performance pneumatic on-off valve will cause. Based on structural features and working principle of hydraulic cartridge valve design. Through the analysis of the aerodynamic force balancing type large diameter main run heart, through the small flow high frequency electromagnetic pilot valve drive, ensure the dynamic performance of high flow pneumatic t wide. Figure 1 is the design of high flow t pneumatic structure simplified model. The pilot stage adopts high-speed solenoid valve, the main valve adopts gas cone differential structure control mode. Due to the dynamic characteristics of the electromagnetic valve is l.JI. relatively mature and stable so the main research main valve switch process by gas control. And the dynamic characteristics of the main valve of the gas control is mainly determined gas charging and discharging process and state, to the main valve control chamber and dynamic characteristics of the valve can be attributed to the charge and discharge characteristics of cavity the study on the main valve control. Because the volume of the control chamber is time-varying, it is not the same as the usual charging and discharging characteristics. The study also has more difficulty.
2 valve core dynamic response process analysis
The opening process and closing process of dynamic process of high pressure pneumatic valve main valve comprises a main valve heart valve control. Dynamic analysis of dynamic system of conventional gas, usually with heart valve movement process to establish a mathematical model for dynamic response of xiao. This method ignores the effect of the control volume of the whole dynamic process, the conventional gas pressure in dynamic characteristic analysis of the components will not cause great errors, but for the high pressure pneumatic system. Because the gas compression rate is larger, the thermodynamic characteristics are produced in the process of dynamic response. The effect of the dynamic characteristics of the high-pressure chamber volume control the pneumatic components can not be ignored. In fact, the main valve opening process variable volume constant volume process and main spool movement process and closing process are still contains the main valve core, and the transition of these two processes are the control cavity gas pressure curve has a turning point. The high pressure pneumatic valve dynamic process of subdivision principle: constant volume process and variable volume process as a unit, in order to control the turning point for the cavity gas pressure, the main valve high-pressure pneumatic on-off valve opening process is divided into control chamber of constant volume gas volume deflation process, control cavity volume gas discharge process: the main content high pressure pneumatic valve will close the process capacity, subdivision inflation process control cavity constant volume gas volume control for variable volume chamber inflating process gas. The definition and description of these processes.
3 mathematical model
According to the tomb of the valve structure and working principle of abstract physical model of dynamic analysis, respectively, high pressure gas flows through the control chamber outlet (pilot valve outlet) and a control chamber inlet (pilot valve inlet mass flow: t months). In order to control the cavity exhaust port area, the. In order to control the cavity inlet area of the cone valve core effective area of the upper end of the valve, the main valve open the bottom end of the effective area of the valve, the main valve closed, the lower end of the cone valve.
Effective area: y, Xi and less respectively the main valve core displacement, speed and acceleration, the direction of the direction of the arrow is positive, the child is the maximum opening of the valve core:. For the cone valve core T, G for the acceleration of gravity, K like elastic stiffness coefficient, damping coefficient ": where is the net effect of.FO in the friction cone valve heart to heart the role in the cone valve spring preload; P., eight and respectively for the process control of gas pressure, gas the density and temperature, and B respectively, several inflatable process control cavity gas pressure, density and temperature. Eight, and Tc respectively for the control of air pressure, density and temperature, Po, Po and To were outside the valve gas pressure, density and temperature: P. source was used. High pressure gas pressure characteristics equation the other parameter definition: Q basin flow coefficient, the production for the adiabatic coefficient of gas, R gas constant, Z gas compressibility factor.
4 Simulation and experimental research
In order to verify the correctness of the theoretical analysis. The simulation of the nonlinear mathematical model of ultra high pressure pneumatic switch run, and the test results and the dynamic performance of the new valve were compared. The basic parameters of the valve: diameter = 3.6Inln, D., D.=25, from Xi.6Inrn ~ = 20 ~, = 15Inm, area, heart, respectively: Han, pill: control of gas pressure Pc=10MPa. pressure P,'10MPa, Pooo:MPa. environmental pressure simulation using Matlab and s~hnk toolbox. The dynamic pressure control chamber side high pressure pneumatic valve fitting in principle diagram, test experiment is done in fluid power transmission and control in Zhejiang University the State Key laboratory. Comparison of pressure test and simulation results: the main valve core displacement simulation curve.
5 main factors affecting the performance of valve
Through the imitation of X research. Under the high pressure, affecting the dynamic characteristics of friction, elastic rigidity and yellow heart valve quality parameters such as t of high pressure pneumatic valve, relative to the geometric parameters of the valve was much smaller. So the following main analysis of geometric parameters of the high-pressure pneumatic on-off valve influence.
6 conclusions
The dynamic process of subdivision principle put forward high pressure stream pneumatic on-off valve:
In order to establish the mathematical model of high pressure pneumatic components and laid a theoretical foundation. The electromagnetic pilot control aerodynamic balance type high pressure pneumatic valve is feasible. Pilot valve diameter determines the main valve opening process of the de