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Seal joint of deep low-temperature nonmetal pipeline

A technology for non-metallic pipes and sealing joints, which is applied in the direction of sealing surface connection, pipe/pipe joint/pipe fitting, passing components, etc.

Inactive Publication Date: 2011-11-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The connecting pipes and joint materials of the above-mentioned patents are all metal

Method used

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  • Seal joint of deep low-temperature nonmetal pipeline
  • Seal joint of deep low-temperature nonmetal pipeline
  • Seal joint of deep low-temperature nonmetal pipeline

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Experimental program
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Embodiment Construction

[0018] A sealed joint of a deep-low temperature non-metallic pipeline, characterized in that it includes a connecting pipeline 1, a nut 2, a metal sealing ring 3, a connecting stud 4 and an inner stud 5; the connecting pipeline 1 adopts an internal A sealing structure and an outer sealing structure, the outer sealing structure includes a connecting pipeline 1, a metal sealing ring 3, a connecting stud 4 and a nut 2; the inner sealing structure includes a connecting pipeline 1, an inner stud 5 and a connecting Stud 4.

[0019] The sealing joint of the deep-low temperature non-metallic pipeline is characterized in that: in the external sealing structure of the pipeline, the connecting pipeline 1, the metal sealing ring 3, the connecting stud 4 and the nut 5 are coaxially arranged, wherein the connecting stud The column 4 is a hollow variable-diameter structure, which is composed of three parts: the front stud 4-1, the middle hexagonal nut 4-2 and the rear stud 4-3. Part of it ...

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Abstract

The invention discloses a seal joint of a deep low-temperature nonmetal pipeline for rapidly connecting nonmetal pipelines and metal pipelines which are used for transmitting deep low-temperature fluid, and keeping seal. The seal joint comprises a nut, a metal seal ring, a metal connecting stud, a metal inner stud and a nonmetal connecting pipeline; the seal structure comprises external seal and internal seal; at the room temperature, the radial force which is generated jointly by the nut, the metal seal ring, the connecting stud and the outer surface of the connecting pipeline deforms the conical metal seal ring so that the metal seal ring and the outer surface of the connecting pipeline contact tightly, thereby achieving the seal effect; when the temperature drops to deep low temperature, such as the temperature of liquid nitrogen (78K), because the heat expansion coefficient of the nonmetal material is greater than that of a metal material, the clearance fit between the nonmetal connecting pipeline and the metal pipeline which is inserted into a pipe at the room temperature is changed into tight fit, thereby achieving the aim of low temperature sealing. The seal joint has the following characteristics that the structure is simple, and can be connected and dismounted rapidly; the seal joint is suitable for a greater range from the room temperature to the deep low temperature, and the temperature fluctuation can not influence the seal effect; the seal effect is good under pressure; and the seal property can not be reduced when the seal joint is used repeatedly.

Description

technical field [0001] The invention relates to a quick-connect sealing joint in the technical field of low-temperature refrigeration, in particular to the connection between metal and non-metal with different effects of thermal expansion and cold contraction. Background technique [0002] Sealing joints are necessary components in the field of cryogenic refrigeration engineering, and require quick connection, simple structure and good sealing. For some special applications, such as cryogenic fluid test benches, it is necessary to observe and photograph the single-phase and multi-phase flow states and heat and mass transfer processes of cryogenic fluids such as liquid nitrogen and liquid oxygen; Visual observation. Therefore, there is a need to replace conventional metal piping with transparent piping. Commonly used transparent piping materials that can be used for deep low temperature include Pyrex glass, some specially formed plexiglass, etc. The ends of pipelines made ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L19/02
Inventor 张小斌姚蕾邱利民
Owner ZHEJIANG UNIV
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