All-closed nuclear drum vacuum valve main shaft sealing structure

Abstract

The invention belongs to the technical field of nuclear vacuum valves, and in particular relates to a fully-enclosed main shaft sealing structure of nuclear rotary drum vacuum valves. The lower sealing ring is fixed between the pressure plate and the assembly cover; the sealing ring is fixed between the shell and the assembly cover; the main shaft is pressed on the lower sealing ring; the diaphragm is welded between the connecting shell and the support; the upper sealing ring is installed on the support Between the seat and the main shaft; the lip seal ring is installed between the sleeve and the main shaft; the matching disc spring group is pressed above the sleeve; the nut is installed above the matching disc spring group; one end of the rubber bowl is fixed on the main shaft through a clamp The other end is fixed on the housing by a large nut. The invention adopts five sealing structures, which fully guarantee the sealing of the main shaft part of the valve. At the same time, the rubber bowl is used to transform the dynamic sealing into static sealing, the design is optimized, and the sealing structure is safe and reliable.

Description

technical field [0001] The invention belongs to the technical field of nuclear vacuum valves, and in particular relates to a fully-enclosed main shaft sealing structure of nuclear rotary drum vacuum valves. Background technique [0002] Nuclear vacuum valves are mainly used to cut off and circulate gaseous materials in cascaded unit systems and inter-unit systems. Due to the high hazard and high price of materials, the valves are required to have high sealing performance. In the past, the valve sealing structure mainly used the traditional packing seal, which can only meet the sealing of small-diameter valves. With the expansion of the separation work of the cascade system, the caliber of the nuclear vacuum valve is also increasing. The traditional sealing structure can no longer meet the sealing of the main shaft of the large-diameter rotary drum vacuum valve. It is necessary to develop a new sealing structure to ensure the rotary drum vacuum valve. Seal at the shaft. Co...

AI Technical Summary

Problems solved by technology

With the expansion of the separation work of the cascade system, the caliber of the nuclear vacuum valve is also increasing. The traditional sealing structure can no longer meet the sealing of the main shaft of the large-diameter rotary drum vacuum valve. It is necessary to develop a new sealing structure to ensure the rotary drum vacuum valve. seal at the shaft

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