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Optimization Design of Connecting Rod Butterfly Valve Plate
Butterfly valve butterfly valve is a structural form, mainly used in metallurgical blast furnace stove system, it has small size, light weight, flexible operation, easy disassembly and so on. Therefore, connecting rod butterfly valve in the hot stove system of air, gas, flue gas and other media has been widely used. Structural characteristics of connecting rod butterfly valve Connecting rod butterfly valve structure shown in Figure 1, it is mainly driven by the valve plate, valve body, spindle, rod system and other components. Valve opening and closing is driven by the drive spindle mechanism to drive the rod body movement, in order to achieve the opening and closing of the valve plate. It can be seen from Figure 1, whether the valve is open or closed, the valve plate and its linked components are always surrounded by the medium. When the valve is closed, the valve plate to withstand all the pressure of the medium, which will cause the plastic deformation of the valve plate, thereby enabling the deformation caused by its linkage; when the valve is opened, the valve plate will be subject to media erosion, and the media flow Caused by the vibration of the valve plate itself, this will also speed up the damage to the moving parts, especially the hinged solid self-lubricating bearings damage. Therefore, the connecting rod butterfly valve plate life is the 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, processing and manufacturing are generally not used casting structure, the traditional valve plate mainly adopts the welding form, as shown in Figure 2, the valve plate on both vertical plates Direct blanking, large round plate after cutting the need for hot forming, pressure out of a certain arc, and then welded with the vertical plate, the final machining. From the technical point of view of this structure of the valve plate for analysis, can be seen from Figure 2, the valve plate consists of three parts: legislation board, pad, large round plate. If this structure of the valve plate, plate and vertical plate can be blanked forming, and the big round of steel you need to craft staff first calculate the size of the cut, and then press the required arc to make pressure-shaped carcass, with the tire will be Large round plate pressed into shape, and finally welded with the other two groups. The main problem lies in the manufacture of pressed tire step, we can see from Figure 2, the central part of the valve plate arc, the edge is a plane, which requires a valve for each specification, we must do a kind of tire With, or can not be pressed out of the required shape. This invisible has increased the manufacturing cost of the enterprise. Finite element analysis of this structure, as shown in Figure 3 is the dn1700 connecting rod valve butterfly valve structure of the traditional 0.4MPa pressure when the analysis results can be seen that the maximum deformation of the valve plate in the two vertical plate , The maximum deformation that occurs at this time is 1.69 mm, which can result in significant damage to the pin and hub connected to the valve plate. Figure 4 shows the hot blast stove cold duct dn1700 cold damage (cold air duct pressure of 0.47mpa, temperature of 350 ℃), the valve damage is due to the valve plate connected to the pin bending, the pin from Lubricated bearings are completely crushed. More Keywords Search: Butterfly valve