As an elastic energy storage device, metal butterfly valve, magnetic butterfly valve and electric butterfly valve are selected respectively.
1) The metal butterfly valve has poor ability to vibrate, absorb vibration and reduce noise. The electric butterfly valve is a new kind of elastic vibration with reduced noise. The positive energy storage buffer element, as the sealing gas chamber of flexible Bush material, is filled with compressed gas. The gas can compress the non-metallic butterfly valve. It has the sound performance of low-frequency vibration absorption and land advantages.
2) The stiffness of the metal butterfly valve is a constant value and cannot be adjusted. The frequency is constant, so it is difficult to adapt to the needs of transmission equipment. The vertical and lateral stiffness and bearing capacity of the electric butterfly valve can be controlled by adjusting the internal pressure stroke, especially the inherent characteristics and initial inflation pressure. The adjustment range is small, and it is more suitable for complex reciprocating drive needs.
3) From the butterfly 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 of the stroke, it provides rapid increase of braking force, rigidity and performance of the electric butterfly valve, Only to meet the nonlinear requirements.
4) The service life of electric butterfly valve is usually longer than that of metal butterfly valve, which is 4 times of that of steel plate butterfly valve. With the help of the electromagnetic reversing valve, the pneumatic butterfly 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 butterfly 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 electric butterfly valves. The vertical stiffness of electric 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 the electric butterfly valve. 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 electric 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 electric butterfly valves are widely used in commercial vehicles, passenger cars, rail vehicles, mechanical equipment and construction bases. The electric 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 butterfly valve.
In addition, there is no contact with the metal butterfly valve, so the sound insulation can be achieved, and the sound insulation effect is also very good.
Butterfly valve stiffness: in the design of butterfly valve stiffness, it can be selected by the change of butterfly valve pressure. 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 butterfly valve stiffness, it is variable and 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 butterfly valve is connected to the auxiliary air chamber, but the natural vibration frequency of the electric butterfly valve device is reduced to 0. 5~3HZ. Under any load, the vibration frequency of the butterfly valve can be kept at almost the same level. An orifice is set between the butterfly valve and the additional air chamber. When the loaded butterfly valve vibrates, the air flow will lose energy through the orifice plate and attenuate the vibration.
The butterfly valve body has a soft structure, and has the vibration isolation function of axial, horizontal and rotary integration. The electric butterfly valve is relatively cheap, easy to install and replace, and simple to maintain, without regular maintenance and refueling.
The control system of CFM electric 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 electric 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 electric butterfly valves through automatic charging and discharging; The mechanical control system is a great progress and a qualitative leap. It is the 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 electric butterfly valve; 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 electric butterfly valve, but also control the nonlinearity of the electric butterfly valve by using control technologies such as fuzzy neural network.