Hydrostatic and hydrodynamic combined type three-stage mechanical seal device for nuclear main pump

A mechanical seal device and mechanical seal technology are applied to parts of pumping devices for elastic fluids, liquid fuel engines, mechanical equipment, etc., which can solve problems such as the inability to establish fluid dynamic pressure effects and friction and wear of sealing surfaces, and achieve Good lubricating effect on the end face, leakage control, and uniform pressure distribution in the end face flow field

Active Publication Date: 2010-02-17
HEFEI GENERAL ENVIRONMENT CONTROL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the disadvantages are: the hydrodynamic pressure effect cannot be established during the pump start and stop stages, and there is a shor

Method used

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  • Hydrostatic and hydrodynamic combined type three-stage mechanical seal device for nuclear main pump
  • Hydrostatic and hydrodynamic combined type three-stage mechanical seal device for nuclear main pump

Examples

Experimental program
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Embodiment Construction

[0021] see figure 2 In this embodiment, three stages of mechanical seals are arranged in sequence along the pump shaft 2 from bottom to top. The first stage seal A is a hydrostatic mechanical seal, the second stage seal B is a hydrodynamic mechanical seal, and the third stage seal C is a contact mechanical seal.

[0022] The structure of the first level seal A is set as:

[0023] The first-stage sealing moving ring 34 and the first-stage moving ring seat 36 are sealed and fixed through the first-stage moving ring gland 35 and the first-stage moving ring gland screw 5, and the first-stage sealing moving ring seat 36 is sealed and fixed through the first-stage moving ring seat 36. The connecting screw 37 of the moving ring seat is sealed and firmly connected with the pump shaft 2, and the torque is transmitted through the transmission pin 3; The static ring gland screw 6 is sealed and fixed, the first stage static ring seat 31 is sealed and connected with the first stage bala...

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Abstract

The invention relates to a hydrostatic and hydrodynamic combined type three-stage mechanical seal device for a nuclear main pump, which comprises three-stage seals connected in series and is characterized in that the first-stage seal is a hydrostatic mechanical seal, the second-stage seal is a hydrodynamic mechanical seal, and the third-stage seal is a contact type mechanical seal. In the second-stage hydrodynamic mechanical seal, on the sealing end surface of a second-stage seal dynamic ring or a second-stage seal static ring, a plurality of groups of fluid shaped grooves which are uniformlydistributed along the circumferential direction are arranged outside the sealing end surface, and each group of shaped grooves comprise an arc groove and a left inclined groove and a right inclined groove which are symmetrically distributed by using the arc groove as a center. In the invention, when the nuclear main pump is in the normal working state, the first-stage hydrostatic mechanical seal bears most of the pressure of the system and runs stably; and after the first-stage seal fails, the second-stage mechanical seal completely can bear the pressure of the whole system and run stably andreliably.

Description

technical field [0001] The invention relates to a mechanical seal device for a nuclear main pump, more specifically, to a mechanical seal device for a nuclear power plant reactor coolant pump. Background technique [0002] The mechanical seal is an indispensable part of the fluid rotating machine, used to prevent the medium from leaking along the gap between the rotating shaft and the housing, and its sealing performance directly affects and determines the working performance of the main engine. Mechanical seals are divided into contact mechanical seals and non-contact mechanical seals. Among them, non-contact mechanical seals are divided into hydrostatic and hydrodynamic mechanical seals. The principle of the hydrostatic mechanical seal is: a sealing end face of the mechanical seal is set as a special geometric gap. When the mechanical seal is in a static state, the pressure fluid can enter the sealing surface, and the hydrostatic pressure is generated by the pressure drop ...

Claims

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Application Information

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IPC IPC(8): F04B53/00
Inventor 李鲲吴兆山丁思云杨博峰郑国运李香沈宗沼姚黎明蔡粤华王玉明
Owner HEFEI GENERAL ENVIRONMENT CONTROL TECH
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