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Fastening structure for use at low temperature

A technology of fastening structure and low temperature environment, applied in the direction of cable fittings, threaded fasteners, connecting components of low temperature cables, etc., can solve the problems of not considering the linear expansion coefficient of flange 6 and weakening of sealing performance

Inactive Publication Date: 2005-02-02
SUMITOMO ELECTRIC IND LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the sealing performance between the nut 8 and the flange 6 is weakened
And this structure does not take into account the linear expansion coefficient of the flange 6
Therefore, if the flange 6 is greatly shrunk due to the temperature drop, the sealing performance will be further weakened.

Method used

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  • Fastening structure for use at low temperature
  • Fastening structure for use at low temperature
  • Fastening structure for use at low temperature

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Embodiment Construction

[0025] A first embodiment of the present invention will be described below with reference to the drawings.

[0026] figure 1 A terminal fitting 10 is shown to which a superconducting cable (not shown) is connected.

[0027] The terminal fitting 10 connects the conductor 16 connected to the superconducting cable to the wire 15 made of copper pipe through the lower protective part 17 inside the container 12, wherein the container 12 is made of stainless steel, and the container 12 is sealed with a cooling Agent R.

[0028] Electric wires 15 protrude from the upper surface of the container 12 while being inserted into a cylindrical sleeve 14 formed by laminating GFRP layers and foil electrodes around the outer circumference of the stainless steel pipe. Then, the electric wire 15 extends to the outside from the upper end of the fourth flange 21 which will be described later.

[0029] Outside the container 12 is provided an external container 13 which defines a space serving as...

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PUM

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Abstract

A first flange (11) and a second flange (12a) are superposed and fastened with a bolt (B) and a nut (N) in a fastening operation, to implement a fastening structure used at temperature lower than atmospheric temperature for the fastening operation. Assuming that the first flange (11) has a thickness L1 and a coefficient of linear expansion alpha 1, the second flange (12a) has a thickness L2 and a coefficient of linear expansion alpha 2, superposed first flange (11) and second flange (12a) have a thickness L, and the bolt (B) has a coefficient of linear expansion alpha , a relation of L. alpha ≥ L1. alpha 1 + L2. alpha 2 is satisfied, i.e. heat shrinkage of the bolt (B) is not smaller than the total heat shrinkage of the first and second flanges (11, 12a). Thus, impairment of sealing property due to heat shrinkage is avoided at a flange junction used at low temperature.

Description

technical field [0001] The invention relates to a fastening structure used in a low temperature environment. More specifically, the present invention improves the sealing performance of a fastening structure used at an air temperature lower than that at which the fastening operation is performed. Background technique [0002] Usually, such as Figure 4A As shown, in order to make liquid helium (Lhe) for cooling flow through the conduit 2B provided in the superconducting wire, the pipe 2A connected to the refrigerator 3 is connected to the Conduit 2B is connected. Such as Figure 4B As shown, the electrical insulation joint 1 is formed by connecting an insulator 5 made of GFRP (glass fiber reinforced plastic) with an adhesive at room temperature and winding it around the outer circumference of the metal pipe 4, and the metal pipe 4 is set at the terminal ends of conduits 2A and 2B. The metal pipe 4 is made of a material that is less heat-shrinkable than GFRP, such as copp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B1/00F16B31/04H01L39/04H02G15/34
CPCY10S285/905F16B31/04F16B2001/0078Y10T403/217F16B2200/97
Inventor 芦边佑一增田孝人高桥芳久本庄升一下馆正人卫藤敬佐
Owner SUMITOMO ELECTRIC IND LTD