Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (10): 84-91.doi: 10.13475/j.fzxb.20210203808

• Textile Engineering • Previous Articles     Next Articles

High-temperature sealing performance of braided heat-sealed components

LIU Junli1,2, XU Zhigao1(), ZHANG Feng2,3, TIAN Gan1, YANG Zhengwei1, WANG Yu3   

  1. 1. College of Missile Engineering Institute, Rocket Force University of Engineering, Xi'an, Shaanxi 710025, China
    2. Beijing Interstellar Glory Technology Co., Ltd., Beijing 100176, China
    3. Shaanxi Interstellar Glory Space Technology Co., Ltd., Xi'an, Shaanxi 710100, China
  • Received:2021-02-15 Revised:2021-05-17 Online:2021-10-15 Published:2021-10-29
  • Contact: XU Zhigao E-mail:ayue113@163.com

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Abstract:

In order to study the sealing performance of braided heat-sealing components directly applied to high-temperature environments, two types of sealing components are selected: three-dimensional double-strand braided rope and double-layer three-strand braided spring tube. Based on the Kozeny-Carman equation of porous media, two sealing leakage models of the sealing components are established. The high-temperature sealing performance was tested separately by high-temperature sealing test, and the leakage of two high-temperature sealing components under different pressure differences and different working conditions and temperatures were obtained, which verified the validity of the model. The research results show that the leakage of the sealing components of the three-dimensional double-strand braided rope and the double-layer three-stranded spring tube gradually increases with the continuous increase of the pressure difference, and gradually decreases with the increase of the temperature. Under the same working conditions, the leakage of the double-layer three-strand braided spring tube seal assembly is less than that of the three-dimensional double-strand braided rope. The research results can provide a reference for the selection of sealing structures suitable for high-temperature environments.

Key words: heat sealing component, braided structure, sealing leakage model, high temperature sealing performance

CLC Number: 

  • TS10

Fig.1

Schematic diagram of sealing components. (a) 3DDSBR sealing components; (b) DLTSBST seal assembly"

Tab.1

Main structural performance of sealing components"

密封组件 密封组件结构 材 料 编织方式
3DDSBR 编织绳 石英纤维棉 三维编织
DLTSBST 外层护套 陶瓷纤维 WallStent
内层护套 陶瓷纤维 WallStent
编织弹簧管 GH 141 Strecker
内部填芯 陶瓷纤维棉 —

Fig.2

Schematic diagram of seal leakage. (a)Flow through seal; (b)Flow around seal"

Fig.3

Schematic diagram of porous media model of sealing component"

Fig.4

3DDSBR seal assembly leakage diagram"

Fig.5

Schematic diagram of leakage of DLTSBST seal assembly"

Fig.6

Schematic diagram of leakage channel and leakage rate of DLTSBST seal assembly"

Fig.7

Schematic diagram of high temperature thermal resistance sealing test platform"

Fig.8

Comparison of test and theoretical data of two kinds of sealing components"

Fig.9

3DDSBR sealing component test and theoretical data comparison"

Fig.10

DLTSBST sealing component test and theoretical data comparison"

Fig.11

Comparison of experimental and theoretical data of two sealing components under different pressure differences"

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