JP2602248B2 - Multi-tube type cryogenic transfer piping - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-tube cryogenic transfer pipe, and more particularly to a multi-tube cryogenic transfer pipe suitable for a pipe having a heat shield tube inside. is there.

[Conventional technology]

In the prior art, for example, a support structure as shown in FIG. 3 has been used. That is, a shield pipe 13 to which a shield coil 6 for flowing liquid nitrogen 7 is attached is disposed concentrically with the outer pipe 1 in the outer pipe 1 forming the heat insulating vacuum layer 2, and liquid helium or the like is provided inside the shield pipe 13. Cryogenic fluid 5
It has a structure in which inner tubes 3 and 4 for transferring a and 5b are arranged. These inner tubes 3 and 4 are screwed up and down
It is supported in the shield pipe 13 by a five-stop plate-like spacer 14. Here, 8a is a spacer supporting the shield pipe 13, and 12a, 12c, 12d are laminated heat insulating materials.

In addition, as a device related to this type of device, for example, Japanese Patent Application Laid-Open No. 30896/1985 is cited.

[Problems to be Solved by the Invention] The above prior art does not consider the ease of assembly, and the spacer 14 can be processed with high dimensional accuracy, but the inner diameter accuracy of the shield pipe 13 is increased to the dimensional accuracy of the spacer 14. Therefore, when assembling, the dimensions of the spacer 14 are adjusted to the inner diameter of the shield pipe 13 and the actual dimensions are determined to determine the final dimensions. Therefore, a great deal of time has been spent on the combination processing.

SUMMARY OF THE INVENTION An object of the present invention is to provide a multi-tube type cryogenic transfer pipe that can be efficiently assembled by eliminating the number of steps required for a combination process.

[Means for solving the problem]

The above object is to provide an outer pipe having a vacuum insulated inside, a shield pipe provided in the outer pipe and arranged substantially concentrically with the outer pipe,
A plurality of inner pipes provided in the shield pipe for transferring a cryogenic fluid, and a space is formed between the outer periphery of the aggregate formed of the plurality of inner pipes and the outer surface of the inner pipe. This is achieved by providing a tubular spacer between the inner surface of the outer tube and the outer surface of the laminated heat insulating material by elastically deforming the laminated heat insulating material into the space.

[Action]

Even if the inner diameter accuracy of the shield pipe is coarse, by partially supporting the laminated heat insulating material that can be elastically deformed further by the tubular spacer, the inner diameter accuracy error of the shield pipe is absorbed by the elastic deformation of the laminated heat insulating material, Eliminates the need for combining when combining.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

A vacuum layer 2 is formed inside the outer tube 1 and serves as a heat insulating layer from the outside. In this case, a shield pipe 13 in which a shield coil 6 for transferring liquid nitrogen 7 is attached to the outer surface by a clamp 11 is disposed in the outer tube 1 by a spacer 8 substantially concentrically with the outer tube 1. Inside the shield pipe 13, inner tubes 3 and 4 for transferring cryogenic fluids 5a and 5b such as liquid helium and liquid hydrogen having a lower temperature are disposed substantially in parallel via a spacer 16. The shield pipe 13 prevents external radiant heat, and the inner pipes 3 and 4 control the shield pipe 1
In order to suppress heat intrusion from radiant heat from 3, laminated heat insulating materials 12a and 12b are attached to the outer periphery of each.

In this case, the inner pipes 3 and 4 are supported by the shield pipe 13
This is performed by a spacer ring 10 having a spacer pipe 9 attached to the inside of the laminated heat insulating layer 12b and a spacer 8 on the outside thereof. At this time, a spacer 16 made of a heat insulating material for maintaining a space is attached between the inner tubes 3 and 4. The diameter of the spacer ring 10 is the same as that of the shield pipe 13 and is shared with the spacer 8.
The laminated heat insulating material 12a is easily wound. The diameter of the spacer pipe 9 attached inside is determined by the relationship between the inner pipes 3 and 4 and the inner diameter of the spacer ring 10, and the final adjustment of the radial dimension is performed by elastic deformation of the laminated heat insulating material 12.

As described above, according to the present embodiment, the variation in the inner diameter of the spacer ring 10 is absorbed by the elastic deformation of the laminated heat insulating material 12b.
Easy and efficient assembly.

Further, the present embodiment includes an outer pipe having a vacuum insulated inside, a shield pipe provided in the outer pipe and arranged substantially concentrically with the outer pipe, and a plurality of pipes provided in the shield pipe for transferring a cryogenic fluid. The inner tube, the shield tube is intermittently arranged in the longitudinal direction, a spacer supported by the outer tube is provided at the intermittent portion, and the plurality of inner tubes are covered with a laminated heat insulating material. By supporting the inner tube via the laminated heat insulating material by the spacer, the actual assembly process is eliminated and the assembling is efficiently performed as described above, and the pitch in the longitudinal direction of the inner tube is accurately determined, It is easier to assemble.

In the present embodiment, the inner pipes 3 and 4 are supported by the support member including the spacer pipe 9, the spacer ring 10 and the spacer 8 on the heat insulating portion of the shield pipe 13 via the laminated heat insulating material 12b. The spacer pipe 9 may be inserted into the shield pipe 13 to support the inner pipes 3 and 4 via the laminated heat insulating material 12b.

〔The invention's effect〕

ADVANTAGE OF THE INVENTION According to this invention, even if it is a multi-tube cryogenic transfer pipe in which a plurality of inner pipes are arranged, there is an effect that the support members for the inner pipes can be efficiently assembled without a joining process when they are combined.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a multi-tube cryogenic transfer pipe according to an embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of FIG. 1 as viewed from AA, and FIG. It is a longitudinal cross-sectional view which shows a type | formula cryogenic transfer pipe. 1 ... outer tube, 2 ... vacuum layer, 3, 4 ... inner tube, 5a, 5b ... cryogenic fluid, 6 ... shield coil, 7 ... liquid nitrogen, 8
... spacer, 9 ... spacer pipe, 10 ... spacer ring, 11 ... clamp, 12a, 12b ... laminated heat insulating material, 13
…… Shield pipe, 16 …… Spacer

Continuation of the front page (72) Inventor Akira Mori 794, Higashi-Toyoi, Katsumatsu-shi, Yamaguchi Prefecture Hitachi Techno Engineering Co., Ltd. Kasado Office (56) References JP-A-60-168989 (JP, A) JP Sho 52 -19339 (JP, B2)

Claims (1)

(57) [Claims] 1. An outer tube whose inside is vacuum-insulated, a shield pipe provided in the outer tube and arranged substantially concentrically with the outer tube, and a plurality of inner pipes provided in the shield pipe for transferring a cryogenic fluid. And the outer periphery of the assembly consisting of the plurality of inner pipes is covered with a laminated heat insulating material so that a space is formed between the inner heat pipe and the outer surface of the inner pipe. A multi-tube type wherein a tubular spacer is provided between the inner surface of the outer tube and the outer surface of the laminated heat insulating material by elastic deformation to thereby partially support the laminated heat insulating material in the shield pipe. Cryogenic transfer piping.