Dry gas sealing device of nuclear fuel circulating pump

A dry gas sealing and circulating pump technology, which is applied to the components of the pumping device for elastic fluid, the sealing of the engine, the fuel element of the reactor, etc. The effect of good durability, less nuclear radiation and long service life

Pending Publication Date: 2021-01-26
CHENGDU YITONG SEAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of poor sealing effect,

Method used

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  • Dry gas sealing device of nuclear fuel circulating pump

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Such as figure 1 As shown, the present invention is a dry gas sealing device for a nuclear fuel circulation pump, which includes a shaft sleeve 2 sleeved on a rotating shaft, a spring seat 4, a safety sealing ring and a sealing chamber cavity 14, and the shaft sleeve 2 passes through the end cover 1. The spring seat 4 and the sealing chamber body 14, the sealing chamber body 14 includes the moving ring 7 and the static ring 10, the outer side of the sleeve 2 is provided with an annular protrusion, the static ring 10 and the moving ring 7 Set symmetrically with annular protrusions, static rings 10 are arranged on both sides of the moving ring 7, the moving ring 7 is fixedly connected with the bushing 2, a spring seat 4 is provided at one end of the static ring 10, and the spring seat 4 and the The sealed cavity cavity 14 is flexibly connected,

[0040] The safety sealing ring includes a safety sealing static ring 15 and a safety sealing dynamic ring 30, the safety sealing...

Embodiment 2

[0043] Such as figure 1 As shown, this embodiment is based on Embodiment 1, the drive ring 7 includes a lower end drive ring 32 and an upper end drive ring 33, the safety sealing dynamic ring 30 is connected to the lower end drive ring 32 through a second anti-rotation pin 31, the The second anti-rotation pin 12 is connected with the lower end drive ring 32, and the lower end drive ring 32 is connected with the upper end drive ring 33 through the wedge ring 17, and one end of the upper end drive ring 33 is provided with a locking screw 18; the lower end of the wedge ring 17 The inclined surface cooperates with the lower end driving ring 32, and the upper end inclined surface cooperates with the upper end driving ring 33. The lower end driving ring 32 is provided with some screw holes, and the upper end driving ring 33 is connected with the lower end driving ring 32 by bolts.

[0044] A sealing ring 5 is arranged between the end cover 1 and the static ring 10, and a sealing rin...

Embodiment 3

[0053] Such as figure 1 As shown, this embodiment is based on Embodiments 1 and 2. The end surface of the moving ring 7 is processed with a fluid dynamic pressure groove. Based on the principle of dynamics, the seal realizes non-contact operation, and at the same time realizes the blocking of the medium, ensuring zero leakage of the nuclear radiation medium to the external environment.

[0054] Working process: the sealing gas enters the safety seal through the small hole, and the pressure acts on the middle step of the safety seal static ring 15. When the force of the pressure on the middle step is greater than the elastic force of the first spring 11, the safety seal static ring 15 will be pushed down Push the compression spring to separate from the safety seal moving ring 30, and open the circulation channel for the leakage gas of the main seal on the atmosphere side, and the seal works normally.

[0055] When encountering an emergency, the pressure of the sealing gas decr...

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PUM

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Abstract

The invention discloses a dry gas sealing device of a nuclear fuel circulating pump. The dry gas sealing device comprises a shaft sleeve, a spring seat, a safety sealing ring and a sealing cavity body, wherein the shaft sleeve is arranged on a rotating shaft in a sleeving mode. The shaft sleeve penetrates through an end cover, the spring seat and the sealing cavity body. The sealing cavity body internally comprises a movable ring and static rings. An annular protrusion is arranged on the outer side of the shaft sleeve. The static rings and the movable ring are symmetrically arranged relative to the annular protrusion. The static rings are arranged on the two sides of the movable ring. The movable ring is fixedly connected with the shaft sleeve. The spring seat is arranged at one end of each static ring. The dry gas sealing device has the advantages that on one hand, medium leakage is eradicated, and on the other hand, the reliability of the sealing ring is enhanced; and the sealing ring is assisted by selecting a nuclear-radiation-resistant and high-temperature-resistant material, so that the sealing ring can stably and safely operate for a long time under the working conditions ofnuclear radiation and high temperature of the nuclear fuel circulating pump completely, and the advantages of being incomparable with conventional sealing under the working conditions, good in durability, long in service life and higher in reliability and safety are achieved.

Description

technical field [0001] The invention relates to the technical field of nuclear fuel circulation pump sealing safety, in particular to a nuclear fuel circulation pump dry gas sealing device. Background technique [0002] The nuclear fuel circulation pump is a special device for transporting high-temperature molten nuclear fuel. The nuclear fuel transported has strong nuclear radiation and high temperature, which can reach 700°C. With the improvement of technology, it can reach 1000°C in the future. [0003] When operating under nuclear radiation conditions, the energy of high-energy waves or high-energy particles is absorbed by the materials in the sealing structure, which may have various effects, especially the rubber sealing ring, which may cause cross-linking and degradation. Excessive energy absorption often leads to poor performance, such as excessive cross-linking leading to embrittlement or fragmentation causing reversion (degradation) leading to physical failure. ...

Claims

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Application Information

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IPC IPC(8): F16J15/34F16J15/40F16J15/16F16J15/10F16J15/30F04C15/00F04D29/10F04D29/12G21C19/28
CPCF04C15/0038F04D29/106F04D29/126F16J15/10F16J15/16F16J15/30F16J15/3448F16J15/346F16J15/3492F16J15/40G21C19/28Y02E30/30
Inventor 唐大全李可亮洪先志牟秀全黄良志
Owner CHENGDU YITONG SEAL
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