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Nuclear main pump mechanical seal system with active and passive shutdown sealing

A technology of parking seals and mechanical seals, which is applied to mechanical equipment, non-variable pumps, machines/engines, etc., can solve the problems of not being able to provide nuclear main pump seals, and achieve the effect of reducing losses

Inactive Publication Date: 2014-05-14
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it still has deficiencies and cannot provide a reliable seal for nuclear main pumps in SBO situations

Method used

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  • Nuclear main pump mechanical seal system with active and passive shutdown sealing

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Embodiment Construction

[0013] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0014] Referring to the accompanying drawings, a nuclear main pump mechanical seal system with active and passive parking seals includes a main shaft 1, a first-stage hydrostatic seal assembly, a second-stage contact seal assembly, and a third-stage contact seal assembly, The first-stage hydrostatic seal assembly is composed of the first dynamic seal 2 and the first static seal 3, the second-stage contact seal assembly is composed of the second dynamic seal 4 and the second static seal 5, and the third-stage contact seal assembly Composed of the third dynamic seal 6 and the third static seal 7, the first stage hydrostatic seal, the second stage contact seal, and the third stage contact seal are connected in series, and a parking seal is added above the third stage contact seal structure, the parking seal structure includes a moving ring 8, a parking s...

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Abstract

The invention discloses a nuclear main pump mechanical seal system with active and passive shutdown sealing. A shutdown sealing structure is added above a third-stage contact type seal, after a shutdown sealing active system control valve and a shutdown sealing passive system control valve are connected in parallel, one end is connected with a high-pressure air source, and the other end is connected with an air supply pipeline providing power for a movable ring through a high-pressure air channel. When a first-stage fluid static seal, a second-stage contact type seal and the third contact type seal are ineffective, or a main pump shuts down, the shutdown sealing has an effect through opening of the active system control valve, so that the shutdown sealing becomes the final shield for preventing reactor coolants from leakage; when severe faults, such as a SBO working condition, happen on a nuclear power station, the shutdown sealing has an effect through the passive system control valve, the reactor coolants are prevented from leakage under the condition, time is saved for further dealing with related problems, and losses of the nuclear power station and environmental pollution possibly caused are reduced.

Description

technical field [0001] The invention relates to the technical field of nuclear main pump mechanical seals, in particular to a nuclear main pump mechanical seal system with active and passive parking seals. Background technique [0002] The reactor coolant pump, namely the nuclear main pump, its mechanical seal is used to control the leakage of reactor coolant along the pump shaft, which is closely related to the safe and reliable operation of the reactor coolant pump. At present, the mechanical seals for reactor coolant pumps mainly used in the world are three-stage mechanical seals, which can be divided into two categories, one is hydrostatic type, and its structure is hydrostatic type for the first stage, second, The third stage adopts a contact mechanical seal structure; the other is a fluid dynamic pressure type, and its structure is a fluid dynamic pressure mechanical seal with the same structure for all three stages. [0003] Whether it is a hydrostatic or a hydrodyna...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/10
Inventor 刘莹刘向锋王悦昶黄伟峰高志王子羲索双富王玉明李鲲
Owner TSINGHUA UNIV
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