As an elastic energy storage device, metal ball valve, magnetic ball valve and pneumatic butterfly valve are selected respectively.
1) The metal ball valve has poor ability to vibrate, absorb vibration and reduce noise. Pneumatic butterfly valve is a new kind of elastic vibration, noise reduction, positive energy storage buffer element as a flexible bush material seal gas chamber filled with compressed gas, the gas can realize the compression of non-metallic ball valve, it has low-frequency vibration absorption and land advantage sound performance.
2) The stiffness of the metal ball valve is a constant value that cannot be adjusted, and the frequency is constant, so it is difficult to meet the needs of the transmission equipment. The vertical and lateral stiffness and bearing capacity of the pneumatic butterfly valve can be controlled by adjusting the internal pressure stroke, especially the inherent characteristics and the initial inflation pressure. With a small adjustment range, it is more suitable for complex reciprocating drive needs.
3) From the ball valve slider model, it is analyzed that the poor quality can not reciprocate, whether in the start-up stage, or in the working frequency and reciprocating operation stage of the accumulator, and a flexible energy storage device with good stiffness and displacement increases from soft to hard to reduce the starting resistance, and at both ends near the stroke, it provides rapid increase of braking force, stiffness and performance of pneumatic butterfly valve, Only to meet the nonlinear requirements.
4) The service life of pneumatic butterfly valve is usually longer than that of metal ball valve, which is 4 times that of steel plate ball valve. With the help of the electromagnetic reversing valve, the balloon valve inflation brigade can be dynamically adjusted even in the process of reciprocating movement, which has great flexibility and controllability.
5) On the one hand, the permanent magnet itself is limited, but it is only suitable for situations with small thrust. The electromagnetic ball valve address overcomes this shortcoming, but it consumes a lot of power. On the other hand, the magnetic field generated by magnetoelastic voltage affects the electromechanical system.
Stiffness is an important parameter to characterize the performance of pneumatic butterfly valves. The vertical stiffness of pneumatic butterfly valves reflects the ability to withstand vertical forces under static conditions. The greater the vertical static stiffness under certain deformation conditions, the greater the vertical bearing capacity. Displacement, load and internal pressure are the main factors affecting the vertical stiffness of pneumatic butterfly valves. The results show that the vertical static stiffness increases with the increase of load and internal pressure, and decreases with the increase of displacement.
The six in one test of vertical static stiffness test is to place the pneumatic butterfly valve on the multi-channel coordination testing machine or special air bomb testing machine to maintain the design standard height of the train. After filling the compressed air, reach the standard load, confirm that the pressure is reduced, and cut off the air supply and exhaust. Standard height from compression to specified displacement so far.
Self regulating air suspension pneumatic butterfly valves are widely used in commercial vehicles, passenger cars, rail vehicles, mechanical equipment and construction bases. The pneumatic butterfly valve is composed of air and has small internal friction, which does not affect the high-frequency vibration isolation capability because of the inherent vibration of the ball valve itself.
In addition, there is no contact of metal ball valve, so it can be soundproof, and the soundproof effect is also very good.
Ball valve stiffness: in the design of ball valve stiffness, it can be selected by the change of ball valve pressure, and the stiffness is roughly proportional to the internal pressure. Therefore, the stiffness that can be selected according to needs is very low. For a given ball valve stiffness, it is variable, and it changes with the change of load, so the vibration frequency of any load is almost the same, Therefore, it can make the support system have almost the same performance.
The ball valve is connected to the auxiliary air chamber, but the natural vibration frequency of the pneumatic butterfly valve device is reduced to 0. 5~3HZ. Under any load, the vibration frequency of the ball valve can be kept at almost the same level. An orifice is arranged between the ball valve and the additional air chamber. When the load ball valve vibrates, the air flow loses energy through the orifice plate and attenuates the vibration.
The ball valve body has a soft structure, and has the vibration isolation function of axial, horizontal and rotary integration. The pneumatic butterfly valve is relatively cheap, easy to install and replace, and simple to maintain. There is no need for regular maintenance and refueling.
The control system of CFM pneumatic butterfly valve has undergone two changes with the progress of relevant technologies. It has gone through three stages: mechanical control, electronic control and intelligent control. However, any control system includes three sub modules: air source system (air source), control elements (including software), and safety device (to ensure the normal operation of pneumatic butterfly valve). The safety devices of air source and three control systems are different from different control elements, but the difference is that for mechanical control systems, the control element control element is mainly a height control valve, which is an electronic control system for height control of pneumatic butterfly valves through automatic charging and discharging; The mechanical control system is a great progress and a qualitative leap. It is an electronic controller (ECU) that uses signals collected by various sensors to analyze the signals and send control signals to the actuator (mainly various solenoid valves), so as to realize the control of pneumatic butterfly valves; Intelligent control. The control system is the automatic control L theory currently used, which is developed on the basis of the electronic control system. It is the main component of the ECU software. The improvement can not only control the height and stiffness of the pneumatic butterfly valve, but also control the nonlinearity of the pneumatic butterfly valve by using control technologies such as fuzzy neural network.