Bellows assembly of SF6 valve and manufacturing method thereof

Abstract

The invention discloses a bellows assembly of an SF6 valve and a manufacturing method thereof. The bellows assembly comprises a valve rod, a support seat and a bellows, wherein the support seat is fixedly connected with the valve rod, and the valve rod is provided with a circular flange; the bellows is sleeved at the periphery of the valve rod between the circular flange and the support seat; and two ends of the bellows are respectively arranged in annular grooves formed on two oppositely arranged end faces of the circular flange and the support seat, and the bellows and the annular grooves are fixed by means of braze welding. Therefore, by using the bellows assembly of the SF6 valve disclosed by the invention, open welding between the mouth of the bellows and the valve rod as well as the support seat can be effectively avoided, thereby greatly improving the air tightness and service life of the bellows assembly.

Description

technical field [0001] The invention relates to a bellows assembly, which is mainly used in SF6 valves. Background technique [0002] In the electrical industry such as high-voltage circuit breakers, in order to avoid sulfur hexafluoride mixed with hydrogen fluoride, sulfur fluoride gas, etc. Sulfur fluoride valves are often sealed with bellows assemblies. [0003] In the prior art, commonly used SF6 valve bellows components, such as figure 1 As shown, it is composed of a valve stem, a support seat and a bellows that seal the valve stem and the support seat. The valve stem and the support seat are made of brass H80 material, and the bellows are made of stainless steel 304 material. Since they are two different materials, Brazing is usually used to weld the two together. In addition, it can be seen from the figure that the two port surfaces of the bellows are respectively brazed with the two ends of the valve stem and the support seat opposite to each other. However, since...

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Problems solved by technology

In addition, it can be seen from the figure that the two port surfaces of the bellows are respectively brazed with the two ends of the valve stem and the support seat opposite to each other. However, since the wall thickness of the bellows is often only 0.14mm, the welding area is very small, and the Brazing is easy to cause missing soldering, and it is difficult to achieve the sealing effect

[0004] It can be seen from the above that the high-tightness requirements of SF6 valves in the electrical industry such as high-voltage circuit breakers are often not met due to the limitations of existing technologies.

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