What is the difference between the electric butterfly valve of the additional air chamber and the ordinary electric butterfly valve
The electric butterfly valve with additional air chamber is to add an additional air chamber to the base of the ordinary electric butterfly valve, and at the same time, open an orifice on the lower piston. When the electric butterfly valve is encouraged, it will exchange with the gas in the additional air chamber under the effect of pressure difference.
The electric butterfly valve with additional air chamber is mainly composed of four parts: upper cover plate, main air chamber (), additional air chamber and orifice connecting air chamber. The main air chamber is mainly a main part supporting the vibration isolation parts and generating elastic force; The additional air chamber is generally a rigid volume made of metal plate shell, which is connected with the main air chamber to increase the volume of air circulation; The orifice is mainly used to limit the moving speed of air between the main and auxiliary air chambers [2]. Compared with the butterfly valve without additional air chamber, the butterfly valve with additional air chamber increases the additional air chamber, increases the total volume and circulation space of the gas, and reduces the stiffness of the butterfly valve; The throttle orifice limits the movement speed of the gas and is the key element to generate the pressure difference between the two gas chambers. When the gas passes through the throttle orifice, it will have a damping effect, which is conducive to accelerating the attenuation of vibration [3]. Li Fu [4], etc., through adopting the experimental method and based on the theory of thermodynamics and fluid mechanics, deduced the stiffness characteristic model of electric butterfly valve, proposed a calculation method to confirm the parameters of electric butterfly valve, and concluded that the shape and stiffness, the volume of additional air chamber and the diameter of throttle hole are the main factors affecting the performance of electric butterfly valve; Wang Jiasheng [5] and others set up the vibration simulation model of the electric butterfly valve with additional air chamber in the environment of Similink by virtue of the mathematical model of the electric butterfly valve and the calculation function of Matlab software, reminding the dynamic characteristics of the electric butterfly valve system to change with the convergence parameters and state parameters, which is the optimal design and completion of stiffness The control of semi-active air suspension with adjustable damping provides theoretical basis and technical support, but its parameterization and visibility are not strong. With the development of high-performance computer technology and the maturity of nonlinear finite element theory, the main international electric butterfly valve manufacturers analyze the characteristics of electric butterfly valves through finite element software. After theoretical analysis and separation of the finite element model, this study establishes an effective finite element model in the nonlinear finite element software Abaqus to simulate and analyze the butterfly valve with and without an additional air chamber, Consider the change of vertical static stiffness of butterfly valve without additional air chamber and butterfly valve with additional air chamber under different air pressure, and consider the influence of vertical stiffness change rule of additional air chamber under different orifice diameters.