JPS6267388A - Cryogenic transfer pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a cryogenic transfer tube, and particularly to a cryogenic transfer tube suitable for a flexible type having a reduced diameter transfer tube cross section.

[Background of the invention]

One example of a conventional cryogenic transfer tube is the Special Publication No. 130 published in 1973.
As described in Publication No. 69, the structure of the transfer tube was a multi-tube structure in which nearly perfect circular tubes were arranged in a concentric manner. However, with this configuration, when inserting multiple single tubes with a diameter smaller than 1ull of the multiple tubes, the outer diameter of the multiple N tubes becomes twice as thick as the outer diameter of the single tubes, and the outer diameter of the outermost tube of the multiple tubes increases by twice the outer diameter of the single tubes. No consideration was given to reducing the size of the .

[Purpose of the invention]

An object of the present invention is to provide a cryogenic transfer tube in which the diameter of the outer tube can be reduced without making the inner tube thinner.

[Key points of the invention]

The present invention provides an inner tube for transferring a cryogenic fluid, an outer tube in which the inner tube is disposed and vacuum insulated by cutting off the inside from outside air, and a tube provided between the outer tube and the inner tube. It is characterized by shielding the radiated heat from the front outer tube to the M inner tube, and is capable of reducing the diameter of the inner tube arranged in the middle tube. .

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to Figure @1. A supply pipe 1 and a return pipe 2, which are inner pipes for transferring a cryogenic fluid such as liquid helium, are connected to each other by a scoop holder 5 within a vacuum space 4 in an elliptical pipe 3, which is one of the middle pipes. kept from direct contact with. A heat medium such as gas helium is sealed in a space 7 between the middle tube 6 and the elliptical tube 3, and a cooling pipe such as a liquid nitrogen supply pipe 8 and a heat insulating material 9 are provided in the space. A 1° liquid nitrogen return pipe is installed. A multilayer insulation material 13 is wrapped around the vacuum space 12 of [m] inside the inner tube 6 and the outer tube 11, and the outer tube 1 is heated at room temperature.
This is intended to reduce heat intrusion from the tube 1 to the middle tube 6.

For example, when liquid nitrogen is supplied to the liquid nitrogen supply pipe 8 at a humidity of 77, the medium pipe 6 and the oval pipe 4 are discharged to about 130 °C through the gas helium, and the supply of liquid helium in the hole 5 is reduced. The heat entering the pipe 1 and the return pipe 2 can be kept to a minimum. In addition, the heat insulating material 9 covering the liquid nitrogen return pipe lO is heated by gas helium in the space 7 to the liquid nitrogen supply pipe 8.
This is provided to prevent the gas helium in the space 7 from being reheated by the liquid nitrogen in the liquid nitrogen return pipe 10, which returns after being heated.

According to this embodiment, since a part of the multilayer tube of the cryogenic transfer tube is made up of an elliptical tube, the liquid nitrogen supply tube 8 and the liquid nitrogen return tube 1° cooling tube are located on the narrow side of the elliptical tube. can be arranged and the space 7 can be used effectively, which has the effect of reducing the outer diameter of the cryogenic transfer tube.

This effect is due to the outer tube 11. Middle tube 6. Elliptical tube 3. Liquid nitrogen return pipe 10. A similar effect occurs even if the liquid helium supply pipe 1 and return pipe 2 are corrugated bellows pipes. Figure 82 shows another embodiment of the present invention. The difference from Figure @1 is the outer tube 11. The middle tube 6 and the oval tube 3 are constituted by corrugated bellows tubes, and the oval tube 3. Liquid nitrogen supply pipe s, f1 body nitrogen return pipe 10. The point is that the liquid helium supply pipe 1 and the return pipe 2 are twisted in a spiral shape. According to this structure, the entire small diameter transfer pipe can be made into a flexible cryogenic transfer pipe with flexibility. I can do it.

(Effects of the Invention) According to the present invention, by making some of the tubes in the cryogenic transfer tube elliptical, the space inside the cryogenic transfer tube can be used effectively, without making the inner tube thinner. This has the effect of reducing the diameter of the outer tube.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a sectional view showing a cryogenic transfer tube according to one embodiment of the present invention, and Figure 2 is a perspective sectional view showing a cryogenic transfer tube according to another embodiment of the present invention. It is.

L: Supply pipe, 2: River return pipe, 3: Tap, oval pipe,
15... Middle pipe, 8... Liquid nitrogen supply pipe, 1o
・Bending liquid nitrogen tube, 11...Outer tube O1 figure 20

Claims (1)

[Scope of Claims] 1. An inner tube for transferring a cryogenic fluid, an outer tube in which the inner tube is placed and vacuum insulated by cutting off the inside from outside air, and a combination of the outer tube and the inner tube. consisting of one or more middle tubes provided between the outer tube and the inner tube to shield radiation heat from the outer tube to the inner tube, and a cooling tube that cools the middle tube; A cryogenic transfer tube characterized by having an oval shape. 2. The cryogenic transfer tube according to claim 1, wherein at least the inner tube, outer tube, and middle tube are corrugated bellows tubes. 3. At least the inner tube, the outer tube, and the middle tube are constructed of corrugated bellows tubes, the middle tube having an elliptical cross section is twisted in a spiral shape, and the cooling tube and the inner tube are formed by twisting the middle tube. The cryogenic transfer tube according to claim 1, which is formed into a spiral shape according to the pitch.