Spline type butterfly plate connecting structure

Abstract

The invention relates to a spline type butterfly plate connecting structure. A butterfly plate is arranged in a valve body; the side edge of the butterfly plate is connected with a driving shaft; the butterfly plate connecting structure comprises the driving shaft, and a lug shaft having a shaft hole in the side edge of the butterfly plate; the free end of the driving shaft is inserted into the shaft hole; the tail periphery of the free end of the driving shaft adopts a spline structure; and a hole opening structure matched with the spline structure is arranged at the bottom of the shaft hole. The driving shaft and the butterfly plate are fixed by the spline structure at the free end of the driving shaft and the matched structure in the lug shaft; when the driving shaft rotates, the rotating torque is borne by the spline structure, and the connecting structure is more stable; meanwhile, the connection of the spline structure replaces the connecting structure of the pin shaft to generate no pin shaft rusting phenomenon; the mounting method of mounting the driving shaft of the spline structure into the lug shaft is simpler and quicker; and the interference structure can prevent the condition of extending a fluid into the shaft hole, so that the shaft hole and the driving shaft are not rusted.

Description

technical field [0001] The invention relates to a connection structure between a butterfly plate in a butterfly valve and a drive shaft driving it to rotate, in particular to a splined butterfly plate connection structure. Background technique [0002] Butterfly valve, also known as flap valve, is a regulating valve with simple structure, which can be used for switch control of low-pressure pipeline medium. Valves, valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. It mainly plays the role of cutting and throttling on the pipeline. The opening and closing part of the butterfly valve is a disc-shaped butterfly plate that rotates around its own axis in the valve body to achieve the purpose of opening and closing or adjustment. [0003] A cage is fixed around the butterfly plate, and a sealing ring is arranged between the cage and the butterfly plate. The invention...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned connection method using the pin shaft, when the drive shaft drives the butterfly plate to rotate, most of the force of the rotating torque needs to be carried by the pin shaft, and the possibility of the pin shaft breaking is relatively high; at the same time, in the above connection structure, the distance between the shaft hole and the drive shaft The pores between the butterfly valves are large, and the fluid passing through the butterfly valve is easy to penetrate into the pores, causing corrosion of the pin shaft and the drive shaft; and the connection method of the pin shaft fixing the shaft hole and the drive shaft is more complicated during the installation process.

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