Optimal design of the valve plate of the hottest c

2022-08-14
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Optimization design of connecting rod butterfly valve valve plate

connecting rod butterfly valve is a structural form of butterfly valve, which is mainly used in the pipeline of metallurgical blast furnace hot blast stove system. It has the advantages of small volume, light weight, flexible action, convenient disassembly and assembly, etc. Therefore, the connecting rod butterfly valve has been widely used in the air, gas, flue gas and other medium pipelines of the hot blast stove system

structural characteristics of connecting rod butterfly valve

the structure of connecting rod butterfly valve is shown in Figure 1, which is mainly composed of driving device, valve plate, valve body, spindle, rod system and other parts. The opening and closing of the valve depends on the driving device to drive the spindle to drive the linkage mechanism to move, so as to realize the opening and closing of the valve plate. It can be seen from Figure 1 that no matter whether the valve is opened or closed, when the traditional rearview mirror uses a design called light wedge to reduce the glare of the front lights of the vehicles behind, the valve plate and its connecting parts are always in the package of media, hoping to provide us with more advanced material technology solutions. When the valve is closed, the valve plate should bear all the pressure of the medium, which will cause the plastic deformation of the valve plate, and then cause the deformation of its connecting parts; When the valve is opened, the valve plate will be scoured by the medium and the vibration of the valve plate itself caused by the medium flow, which will also accelerate the damage of the connecting parts, especially the damage of the solid self-lubricating bearing at the hinge. Therefore, the service life of connecting rod butterfly valve plate is also the service life of connecting rod butterfly valve

structural analysis of connecting rod butterfly valve plate

according to the structural characteristics of connecting rod butterfly valve plate, casting structure is generally not used in processing and manufacturing. The traditional valve plate mainly adopts the form of welding, as shown in Figure 2. The two vertical plates on the valve plate are directly cut by steel plates. After cutting, the large round steel plates need to be hot pressed to form, press out a certain arc, and then weld with the vertical plates. Finally, machining is carried out to realize the "made in China" work of China's automotive industry

the valve plate with this structure is analyzed from the perspective of process. It can be seen from Figure 2 that the valve plate is composed of three parts: vertical plate, base plate and large round steel plate. If the valve plate, base plate and vertical plate with this structure are used, they can be directly cut and formed, while the large round steel plate requires the technologist to first calculate the cutting size, and then make the pressing mold according to the required arc, press the large round steel plate with the mold, and finally assemble and weld with the other two parts. The main problem lies in the step of manufacturing the pressure mold. As can be seen from Figure 2, the center part of the valve plate is arc-shaped, and the edge is a plane. Therefore, every time a valve of a specification is made, a mold must be made, otherwise the required shape cannot be pressed out. This virtually increases the manufacturing cost of the enterprise

this structure is analyzed with finite element technology, as shown in Figure 3, which is the analysis result of adding 0.4MPa pressure to the traditional structure valve plate of dn1700 connecting rod butterfly valve. It can be seen that the maximum deformation of the whole valve plate is on the two vertical plates, and the maximum deformation at this time is 1.69mm, which will greatly damage the pin shaft and shaft sleeve connected with the valve plate. As shown in Figure 4, the damage of the dn1700 cold air valve in the cold air pipe of the hot blast stove (the pressure of the cold air pipe is 0.47mpa and the temperature is 350 ℃) is caused by the bending of the pin shaft connected to the valve plate and the complete crushing of the self-lubricating bearing at the pin shaft

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