Self-compensating emergency combined seal for nuclear reactor main circulation pump sealing device

Abstract

The invention belongs to the field of sealing and in particular relates to a self-compensating emergency combination seal for a nuclear reactor main circulation pump sealing device which is capable of automatically starting in a high-temperature medium. The self-compensating emergency combination seal for the nuclear reactor main circulation pump sealing device comprises a heat-resisting ring, wherein the heat-resisting ring is positioned in a machine shell cylinder body, sleeved and matched with a spindle; a channel for circulation of a medium is formed in the heat-resisting ring and / or between the heat-resisting ring and one of a peripheral wall of the spindle and a cylinder wall of the cylinder body; the self-compensating emergency combination seal for the nuclear reactor main circulation pump sealing device also comprises a movable part; the movable part has two position states; when temperature of the medium is lower than a pointed temperature, the movable part is in a primary position and the channel is in a conduction state; and when the temperature of the medium reaches a set dangerous temperature, the movable acts and seal the channel. The self-compensating emergency combination seal, which is capable of automatically starting in the high-temperature medium, is capable of automatically starting when a nuclear industry system has faults and stops, so that effect of sealing is achieved; goal of effectively preventing nuclear mediums from leaking is achieved; and personal safety and property safety are protected.

Description

technical field [0001] The invention belongs to the field of sealing, and in particular relates to a self-compensating emergency combined seal for a nuclear reactor main circulation pump sealing device which can automatically start when encountering a high-temperature medium to realize its sealing function. Background technique [0002] The combined sealing device is a sealing device that organically combines seals with different structural forms, different functions, and different materials according to the sealing design principle and material characteristics, so as to realize many functions such as throttling and multiple sealing. In the field of nuclear industry, the requirements for sealing devices are even more stringent. On the one hand, it must meet the requirements of working conditions under normal working conditions to ensure the normal operation of equipment, and on the other hand, it must meet the requirements of special conditions such as high temperature and hi...

AI Technical Summary

Problems solved by technology

[0003] At present, in the field of nuclear industry, during normal operation, the temperature of the working medium is low, such as below 80°C, the commonly used seals and sealing devices can meet the requirements of the working conditions; however, when the system fails and stops, the working medium The temperature will rise rapidly. If no corresponding protective measures are taken, the subsequent rubber or plastic seals at the lower seals will directly come into contact with high-temperature media, resulting in a rapid decline in their inherent sealing performance, resulting in seal failure and high-temperature radiation. Medium leakage, a serious threat to personal and property safety

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