Wedge groove curvature sealing structure for dynamic and static gaps for nuclear main pump

A technology of sealing structure and nuclear main pump, which is applied to parts, pumps and pump elements of pumping devices used for elastic fluids, can solve problems such as reducing flow resistance, reduce leakage flow, increase service life, The effect of increasing flow resistance

Active Publication Date: 2012-11-21
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the inside of the seal is a liquid working medium, the leakage pressure of the internal fluid is reduced by relying on the vortex dissipation in the seal flow channel to generate pressure loss and the throttling and depressurization effect of the narrow gap, but this depressurization effect is only effective for high Reynolds number liquid seals , and at low Reynolds numbers (Re<400~500), narrow gaps will reduce flow resistance

Method used

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  • Wedge groove curvature sealing structure for dynamic and static gaps for nuclear main pump
  • Wedge groove curvature sealing structure for dynamic and static gaps for nuclear main pump
  • Wedge groove curvature sealing structure for dynamic and static gaps for nuclear main pump

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Embodiment Construction

[0027] The following describes the application in detail by taking the nuclear main pump as an example in conjunction with the technical solution.

[0028] The seal of this application is composed of two semicircular seal rings, which can be installed in the dynamic and static gap between the impeller outlet and the guide vane of the nuclear main pump, the dynamic and static gap between the impeller inlet wheel cover and the inlet guide pipe, or installed between the heat shield and the rotating shaft gap. The back arc of the seal ring is installed along the groove of the fixed part, and the arc direction of the seal groove is opposite to the rotation direction of the rotor. The sealing structure of this application is mainly composed of a sealing dam, a sealing boss and a sealing ring.

[0029] Multiple sealing grooves can be set in the circumferential direction of the inner ring of the sealing ring, figure 1 As shown, seal grooves are set every 5°.

[0030] Due to the vis...

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Abstract

The invention relates to a wedge groove curvature sealing structure for dynamic and static gaps for a nuclear main pump. A static component of a nuclear main pump is provided with a sealing ring; the inner surface of the sealing ring is provided with a curvature sealing groove; the sealing groove is arranged at the inner surface of the sealing ring according to the opposite direction of the rotation of a rotor; a rotary component rotates to drive a fluid to rotate; and a working medium enters the curvature sealing groove, flowing which is opposite to the direction of a leakage flow is formed,the fluid forms the pressure resistance at the inlet of the sealing groove to block the leakage flow. The nuclear main pump provided by the invention is used under the condition of a high-pressure high-temperature high-speed large flow rate working condition, leakage flow rate can be controlled steadily and temporarily under a backflow extreme working condition, and is safe, durable and has a good leakage control effect.

Description

technical field [0001] The application belongs to the technical field of non-contact sealing, and relates to a wedge groove arc sealing structure for a dynamic and static gap of a nuclear main pump. Background technique [0002] Non-contact sealing technology is used to control the medium leakage between the rotating part and the stationary part of the pump. The flow resistance type seal is a kind of non-contact seal, which relies on the fluid resistance generated by the sealing gap of different shapes to reduce the leakage. When the inside of the seal is a liquid working medium, the leakage pressure of the internal fluid is reduced by relying on the vortex dissipation in the seal flow channel to generate pressure loss and the throttling and depressurization effect of the narrow gap, but this depressurization effect is only effective for high Reynolds number liquid seals , and at low Reynolds numbers (Re<400~500), narrow gaps will reduce flow resistance. The fluid dynam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D29/16
Inventor 王晓放张盟赵广刘艳徐胜利
Owner DALIAN UNIV OF TECH
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