Double-end-face fluid dynamic and static pressure mechanical seal for sodium cooling fast reactor nuclear main pump

A sodium-cooled fast reactor and mechanical seal technology, which is applied to liquid fuel engines, components of pumping devices for elastic fluids, mechanical equipment, etc. Guaranteed stability and durability, avoids abrasive wear, wide range of effects

Active Publication Date: 2017-05-10
NANJING FORESTRY UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to propose a double-end surface fluid dynamic and static pressure self-pumping mechanical seal for the main pump of the sodium-cooled fast reactor nuclear pump, so as to solve the leakage of the circulating working medium in the existing sodium pump and the possible leakage of the blocking fluid lubricating oil into the pump. In order to ensure the safe and stable long-term operation of the fast reactor

Method used

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  • Double-end-face fluid dynamic and static pressure mechanical seal for sodium cooling fast reactor nuclear main pump
  • Double-end-face fluid dynamic and static pressure mechanical seal for sodium cooling fast reactor nuclear main pump
  • Double-end-face fluid dynamic and static pressure mechanical seal for sodium cooling fast reactor nuclear main pump

Examples

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Effect test

Embodiment 1

[0080] Example 1: A double-end fluid dynamic and static pressure mechanical seal for a sodium-cooled fast reactor nuclear main pump with axial and radial combined channels on the moving ring

[0081] see figure 2 , 3 , 6, the inlets 31 of the back-curved fluid grooves 39 located at the upper and lower ends of the moving ring are all communicated with the outer sealing space through the axial and radial combination channels 30 opened on the moving ring 10 . When the moving ring rotates, the blocking fluid in the outer sealing space, such as argon, flows into the back-curved fluid groove 39 through the axial and radial combined holes 30 on the moving ring 10 under the action of pressure difference, forming a self-pump again and again. send loop.

Embodiment 2

[0082] Example 2: A double-end fluid dynamic and static pressure mechanical seal for a sodium-cooled fast reactor nuclear main pump with circular grooves on the moving ring and axial and radial combined channels on the static ring

[0083] see Figure 4 , 5 , 7 and 8, the inlet 31 of the back-curved fluid groove 39 on the moving ring communicates with the circular ring groove 36 arranged in the middle of the sealing surface of the moving ring 10 . One end of the axial-radial combination hole 30 opened on the static ring communicates with the outer sealing space, and the other end is opposite to the circular ring groove 36 in the axial direction.

[0084] When the moving ring rotates, the blocking fluid in the outer sealing space, such as argon, flows into the back-curved fluid type through the axial and radial combination channels 30 on the static ring and the circular ring groove 36 on the moving ring under the action of pressure difference. In the tank 39, a self-pumping c...

Embodiment 3

[0085] Example 3: A double-end fluid dynamic and static pressure mechanical seal for a sodium-cooled fast reactor nuclear main pump with circular grooves and axial and radial combined channels on the static ring

[0086] see Figure 9 , 10 shown (refer to Figure 4 , 5 ), the inlet 31 of the back-curved fluid-type groove 39 on the moving ring communicates with the circular groove 36 opened in the middle of the sealing surface of the static ring, and the circular groove 36 is combined through the axial radial direction opened on the static ring The tunnel 30 communicates with the outer sealed space. When the moving ring rotates, the blocking fluid in the outer sealing space, such as argon, flows into the back-curved fluid type through the axial and radial combination channels 30 on the static ring and the circular ring groove 36 on the static ring under the action of pressure difference. In the tank 39, a self-pumping cycle is formed time after time.

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PUM

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Abstract

The invention provides a double-end-face fluid dynamic and static pressure mechanical seal for a sodium cooling fast reactor nuclear main pump. The double-end-face fluid dynamic and static pressure mechanical seal aims at solving the problems that a circulating working medium in an existing sodium pump leaks, and blocking fluid lubricating oil probably leaks into the pump to contaminate the working medium, and guaranteeing safe, stable and long-term operation of a fast reactor. The mechanical seal is composed of a dynamic ring, static rings, a spring, a sealing shell and the like, wherein a self-pumping fluid sealing structure is formed by the static rings and the two ends of the dynamic ring. The dynamic ring is matched with a pin on a shaft sleeve, and it is achieved that the dynamic ring is circumferentially and axially positioned; a set screw is arranged on the shaft sleeve; a limiting stopper is detachably arranged between the sealing shell or spring bases and the shaft sleeve to limit axial relative positions of the shaft sleeve and the spring bases, the elasticity of springs is changed, and pressure between the dynamic ring and the two static rings is identical; and when the dynamic ring rotates, blocking fluid inflated into an outer sealing space defined by the dynamic ring, the sealing shell and the like flows into a backwards-bent type fluid groove formed in the end face of the dynamic ring through an axial and radial combined pore canal under the effect of differential pressure, and self-pumping circulation is formed over and over again.

Description

technical field [0001] The invention belongs to the technical field of sealing, and in particular relates to a self-pumping mechanical seal with hydrodynamic and static pressure effects, which is suitable for sealing between a sodium-cooled fast reactor nuclear main pump casing and a pump shaft. Background technique [0002] Nuclear power is ushering in a new round of rapid development worldwide. From the late 1950s to the early 1960s, since the first batch of prototype nuclear power plants were built in the world, the development of nuclear power technology has gone through the first and second generations, and is currently moving towards the third and fourth generations. There are many types of nuclear power plant reactors, which can be divided into light water reactors (including pressurized water reactors and boiling water reactors), heavy water reactors, graphite gas-cooled reactors, and fast breeder reactors. According to the thermal system, there are three types of n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/12F04D29/70F04D29/06F04D29/58
CPCF04D29/061F04D29/126F04D29/588F04D29/708
Inventor 孙见君陈国旗马晨波全琴段衍筠牛韬
Owner NANJING FORESTRY UNIV
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