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Pressurized water reactor pressure stabilizer spray head connecting structure with labyrinth seal structure

A technology of labyrinth sealing and connection structure, which is applied in the direction of injection devices, etc., can solve the problems of local stress concentration and affecting the performance of the material performance of the nozzle nozzle of the spray head, etc.

Active Publication Date: 2019-07-09
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under normal operation, the temperature of the pipe seat of the nozzle of the spray head is tens of degrees Celsius higher than that of the spray water, and the spray water will cause thermal shock to the pipe seat of the nozzle of the spray head. Fatigue will cause local stress concentration, which will affect the performance of the material of the nozzle nozzle seat of the spray head

Method used

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  • Pressurized water reactor pressure stabilizer spray head connecting structure with labyrinth seal structure
  • Pressurized water reactor pressure stabilizer spray head connecting structure with labyrinth seal structure
  • Pressurized water reactor pressure stabilizer spray head connecting structure with labyrinth seal structure

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Experimental program
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Effect test

Embodiment 1

[0022] as attached figure 2 As shown, the spray water inlet flow rate in the spray head assembly is lower than or equal to the spray flow rate, the spray water enters the spray head assembly, and under the spray pressure, the spray water enters the internal space of the regulator through the spray head assembly, The spray water level in the spray head assembly is always lower than the spray head connecting pipe.

Embodiment 2

[0024] as attached figure 2 As shown, the spray water inlet flow rate in the spray head assembly is higher than the spray flow rate, the spray water enters the spray head assembly, and under the action of the spray pressure, the spray water sprays into the internal space of the regulator. The level of the inner spray water keeps rising, and the spray water flows through the labyrinth sealing structure and then fills into the space formed by the upper part of the spray head connecting pipe and the spray head heat-shock protection sleeve, and quickly exits the spray head connecting pipe through the discharge hole.

Embodiment 3

[0026] as attached figure 2 As shown, the welding seam between the spray head thermal shock protection sleeve and the safety end of the spray head nozzle is broken, the spray head heat shock protection sleeve falls to the boss in the middle of the spray head connection pipe, and the boss in the middle of the spray head connection pipe Provides support for the thermal shock sleeve, which retains some thermal shock protection.

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Abstract

The invention belongs to the field of structural design of pressurized water reactor nuclear power device pressure stabilizers, and particularly relates to a pressurized water reactor pressure stabilizer spray head connecting structure with a labyrinth seal structure. The invention aims to design a spray head connecting pipe with a labyrinth seal structure, which not only can play the effect of connecting a spray head assembly, but also can shield the thermal shock of spray water on a spray head filler neck pipe seat and improve the stress state of the spray head filler neck pipe seat. Besides, after the weld joint between a thermal shock prevention sleeve and the safety end of a spray head filler neck is broken, the spray head connecting pipe can also play a role in supporting the thermalshock prevention sleeve, and the thermal shock prevention function of the thermal shock prevention sleeve is partially guaranteed; the structure comprises a spray head connecting pipe (1), a spray head filler neck pipe seat (2), a spray head thermal shock prevention sleeve (3), a spray head assembly (4) and a spray head filler neck safety end (5).

Description

technical field [0001] The invention belongs to the structural design field of a pressurized water reactor pressurizer, in particular to a spray head connection structure of a pressurized water reactor pressurizer with a labyrinth sealing structure. Background technique [0002] The spray head connecting pipe is arranged on the top of the pressurized water reactor stabilizer, and its main function is to ensure the stable and reliable connection between the spray head assembly and the spray head nozzle socket. [0003] Most of the existing PWR regulator spray head connecting pipes adopt a pipe-type connection structure. as attached figure 1 As shown, the upper end of the spray head connecting pipe is T-shaped welded with the inner wall of the spray nozzle nozzle; the outer end of the lower part of the spray head connecting pipe has a taper thread, which is connected with the inner taper thread of the spray head assembly; the inner diameter of the spray head connecting pipe i...

Claims

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Application Information

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IPC IPC(8): B05B15/65B05B12/08
CPCB05B12/085
Inventor 李焕鸣鲁佳邓丰何劲松黄均麟刘威胡彧田雅婧
Owner NUCLEAR POWER INSTITUTE OF CHINA
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