Mechanical seal device for nuclear power waste heat removal pump

Abstract

The invention relates to a mechanical seal device for a nuclear power waste heat removal pump. The mechanical seal device comprises a movable ring component, a static ring component, a gland, and a water seal device on the gland. A movable ring and a static ring which are mounted in a floating manner and matched with each other are stable, reliable, good in tracing ability and high in seal performance. The water seal device on the gland is of a two-conical-face matching type and has a seal function when the mechanical seal device of a pump shaft cannot seal to keep pressure in a pump cavity during accidents such as crushing and damaging of the seal device, massive media leaking out of the pump can be prevented, and high application safety and reliability are achieved.

Description

technical field [0001] The patent of the present invention relates to a mechanical seal device, especially a mechanical seal device used in a waste heat discharge pump of a nuclear power plant. Background technique [0002] According to the different working conditions of the mechanical seal device, the specific structure of the mechanical seal device is also different. [0003] The mechanical seal device used in the prior art for nuclear power plant waste heat high pressure hot water discharge pump is as attached figure 1 As shown, it includes a moving ring assembly a, a static ring assembly b, a gland c, and a shaft sleeve d. A water seal device e is installed on the gland c, and the moving ring assembly a is fitted on the shaft sleeve d. The ring assembly b is fitted on the gland c, and the cooling liquid pumping ring a1 is connected to the moving ring assembly a. The outer end of the shaft sleeve d is fixedly connected to the shaft through fastening screws. On the outer...

AI Technical Summary

Problems solved by technology

The application of the above-mentioned prior art to the waste heat high-pressure hot water discharge pump in nuclear power plants cannot fully meet such requirements

Specifically, the structural performance of the moving ring assembly and the static ring assembly of the above-mentioned prior art, the matching performance of the moving ring and the static ring, the structural performance of the water seal device, the fixed connection performance of the shaft sleeve d and the shaft, and the combination of these Overall performance is not ideal

The followability of the moving ring and the static ring is not ideal. At the same time, both the moving ring and the static ring adopt a mosaic structure, and their mutual following is not good, which affects the sealing performance. The graphite moving ring and the ring seat are connected together by mosaic. The inlaying force of the ring seat on the moving ring causes deformation of the end face of the graphite moving ring, which affects the sealing performance, and the dimensional accuracy of the inlay is relatively high, which increases the difficulty of processing; The sleeve d is fixed to the transmission connection, and the screws are easy to loosen, resulting in seal failure; the water seal device cannot meet the absolute sealing performance requirements. Once the end faces of the mechanical seal of the moving ring and the static ring are crushed, the medium will produce a large amount of leakage through the water seal device e , can not guarantee the normal operation of the pump for a period of time, to provide sufficient time for emergency treatment

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