Grinding process for sealing surface of nuclear main pump mechanical sealing part

Abstract

The invention relates to a grinding process for a sealing surface of a nuclear main pump mechanical sealing part. The grinding process is used for grinding the sealing surfaces of parts of a static bottom ring, a sliding bottom ring and a rotary sliding ring in the nuclear main pump mechanical sealing part. A working site: the grinding of the mechanical sealing part should be performed in a constant temperature room, an operation room is clean and dust-free, the temperature is required to be 20-25 DEG C, and the rapid change of the temperature larger than 1 DEG C is avoided in the grinding process. Through rough and fine plane grinding and polishing processes, the planeness of the sealing surfaces of the static bottom ring, the sliding bottom ring and the rotary sliding ring in the mechanical seal is ensured to reach the precision of + / -0.2 microns, and the roughness Ra is 0.02-0.01. The mechanical seal of a shaft seal main pump is formed by connecting three stages of flowing pressure mechanical seals with the same structure in series, and the effect is to prevent a primary loop medium from leaking to the outside of the main pump to cause radiation pollution to the external environment.

Description

Technical field: [0001] The invention relates to a sealing surface grinding process of a nuclear main pump mechanical seal part Background technique: [0002] The shaft-sealed nuclear main pump is one of the most critical nuclear island main equipment in the primary circuit system of the nuclear power plant. The nuclear main pump represents the highest level of design and manufacture of contemporary pump products. Among them, the manufacturing process of the hydrodynamic mechanical seal is the shaft seal The core technology of the pump is currently only mastered by a few developed countries such as the United States, Russia, France, Germany, and its manufacturing technology, and its manufacturing process has never been transferred. The operating life of the mechanical seal of the main pump, the accuracy of the shape and position tolerance of the stationary bottom ring, sliding bottom ring, and rotating sliding ring sealing surface in the mechanical seal are very high. The co...

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Problems solved by technology

[0002] The shaft-sealed nuclear main pump is one of the most critical nuclear island main equipment in the primary circuit system of the nuclear power plant. The nuclear main pump represents the highest level of design and manufacture of contemporary pump products. Among them, the manufacturing process of the hydrodynamic mechanical seal is the shaft seal The core technology of the pump is currently only mastered by a few developed countries such as the United States, Russia, France, Germany, and its manufacturing technology, and its manufacturing process has never been transferred. The operating life of the mechanical seal of the main pump, the accuracy of the shape and position tolerance of the stationary bottom ring, sliding bottom ring, and rotating sliding ring sealing surface in the mechanical seal are very high. The conventional processing method uses a high-precision grinding machine for grinding. The dimensional accuracy of the sliding sealing surface of the mechanical seal cannot be guaranteed, resulting in excessive leakage of the mechanical seal sleeve during the operation of the shaft seal pump, which affects the reliable operation of the nuclear power plant reactor

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