JP2016166664A - Heat insulation pipe, method for manufacturing heat insulation pipe and superconduction cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat insulation pipe that can suppress local crash of a heat insulation material and improve thermal insulation performance.SOLUTION: The heat insulation pipe 20 includes: an inner pipe 22; an outer pipe 26 provided in a periphery of the inner pipe 22 while having a space part 24 between the inner pipe 22 and the outer pipe; a spacer 28 disposed in the space part 24 and having multiple bumps 32 therein; and the heat insulation material 30 disposed in the space part 24 while superposed on the spacer 28.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat insulating tube, a method for manufacturing a heat insulating tube, and a superconducting cable.

  Patent Document 1 discloses a heat insulating pipe in which a heat insulating material and a linear spacer are built in a space between an inner pipe and an outer pipe.

JP 2011-226621 A

  By the way, in the double structure pipe like the heat insulation pipe | tube disclosed by patent document 1, the heat insulating material pinched | interposed by the inner pipe and the outer pipe by the dead weight of an inner pipe, the bending of a heat insulation pipe, etc. may collapse locally. There is. The heat insulating performance is reduced in the locally crushed portion of the heat insulating material.

  Moreover, in the heat insulation pipe | tube disclosed by patent document 1, although the vertex of a spacer is making line contact with the inner peripheral surface of an outer pipe, the heat transfer between an inner pipe and an outer pipe is suppressed, Therefore, further improvement of heat insulation performance is required.

  In consideration of the above-described facts, an object of the present invention is to provide a heat insulating tube, a method for manufacturing the heat insulating tube, and a superconducting cable that can suppress local crushing of the heat insulating material and have improved heat insulating performance.

  The heat insulation pipe according to claim 1, an inner pipe, an outer pipe arranged with a space portion between the inner pipe and an outer circumference of the inner pipe, and a plurality of convex parts arranged in the space section , And a heat insulating material disposed in the space portion so as to overlap the spacer.

In the heat insulation pipe according to claim 1, the space formed between the inner pipe and the outer pipe is maintained by the spacer interspersed with a plurality of convex portions.
Further, in the above heat insulating pipe, a plurality of convex portions are scattered on the spacer, and the convex portions contact with the outer peripheral surface of the inner tube or the inner peripheral surface of the outer tube as points (point contact). The contact area is smaller than that in line contact with the inner peripheral surface of the outer tube, such as a spacer of a body, and heat is not easily transferred between the inner tube and the outer tube. That is, the heat insulation performance is improved.
Moreover, in the said heat insulation pipe | tube, since a heat insulating material is arrange | positioned in a space part, heat insulation performance improves further.

Furthermore, in the said heat insulation pipe | tube, since a heat insulating material is arrange | positioned overlapping with a spacer, it is suppressed that a heat insulating material is crushed locally by the self-weight of an inner pipe | tube, the bending of a heat insulation pipe | tube, etc. Thereby, the fall of the heat insulation performance resulting from the local crushing of a heat insulating material is suppressed.
From the above, according to the heat insulation pipe of claim 1, local crushing of the heat insulating material is suppressed, and the heat insulation performance is improved.

  The heat insulation pipe according to claim 2 is the heat insulation pipe according to claim 1, wherein the spacer is a belt and is wound around the inner pipe.

  In the heat insulation pipe according to claim 2, since the belt-like spacer (band body) is wound around the inner pipe, for example, the heat insulation pipe has a structure in which one sheet-like spacer is wound around the inner pipe. It becomes easy to bend and handle easily.

  A heat insulating pipe according to a third aspect is the heat insulating pipe according to the first or second aspect, wherein a metal layer is formed on one surface of the spacer.

  In the heat insulation pipe according to the third aspect, since the metal layer is formed on one surface of the spacer, the penetration of the radiant heat from the outside or the diffusion of the radiant heat from the inside can be prevented by this metal layer. Thereby, the heat insulation performance of a heat insulation pipe further improves.

  The heat insulation pipe | tube of Claim 4 is a heat insulation pipe | tube of any one of Claims 1-3, The said spacer is arrange | positioned between the said inner pipe | tube and the said heat insulating material, and the said convex part is an inside. It is directed to the tube side.

  In the heat insulating pipe according to claim 4, since the spacer is disposed between the inner pipe and the heat insulating material and the convex portion is directed to the inner pipe side, heat transfer from the outer pipe to the inner pipe is effectively suppressed. can do.

  According to a fifth aspect of the present invention, in the heat insulation pipe according to any one of the first to fourth aspects, a superconducting cable core is housed in the inner pipe, and the space is evacuated.

  In the heat insulation pipe | tube of Claim 5, heat insulation performance improves more by making a space part into a vacuum.

  The manufacturing method of the heat insulation pipe | tube of Claim 6 is a process of winding the strip | belt-shaped spacer in which the convex part was scattered on the inner pipe | tube, the process of winding a strip | belt-shaped heat insulating material around the inner pipe | tube in which the said spacer was wound, and the said heat insulation And inserting the inner tube around which the material is wound into the outer tube.

In the method for manufacturing a heat insulating pipe according to claim 6, a strip-shaped spacer having a convex portion scattered around the inner pipe is wound, and a strip-shaped heat insulating material is wound around the inner pipe around which the spacer is wound. The wound inner tube is inserted into the outer tube.
The heat insulating tube manufactured in this way is dotted with a plurality of convex portions on the spacer, and this convex portion contacts the outer peripheral surface of the inner tube or the inner peripheral surface of the outer tube as a point (point contact). For example, the contact area is smaller than that in line contact with the inner peripheral surface of the outer tube, such as a linear spacer, and heat is hardly transmitted between the inner tube and the outer tube. That is, the heat insulation performance is improved. Moreover, in the said heat insulation pipe | tube, since a heat insulating material is arrange | positioned in the space part between an outer pipe | tube and an inner pipe | tube, heat insulation performance improves further.

Moreover, in the manufacturing method of the said heat insulation pipe | tube, in order to wind a strip | belt-shaped heat insulating material around the inner tube around which the strip | belt-shaped spacer was wound, a heat insulating material is arrange | positioned in piles with a spacer. For this reason, in the said heat insulation pipe | tube, since a heat insulating material is arrange | positioned in piles with a spacer, the local collapse of the heat insulating material at the time of bending a heat insulation pipe | tube is suppressed. Thereby, the fall of the heat insulation performance resulting from the local crushing of a heat insulating material is suppressed.
As mentioned above, according to the manufacturing method of the heat insulation pipe | tube of Claim 6, the local crushing of a heat insulating material can be suppressed and the heat insulation pipe | tube which improved the heat insulation performance can be manufactured.
Moreover, in the said heat insulation pipe | tube manufacturing method, since a strip | belt-shaped spacer is wound and it is set as a heat insulation structure, compared with what arranges the spacer of a linear body on the surface of a heat insulating material, and makes it a heat insulation structure, for example. Manufacturing is easy.

  The superconducting cable according to claim 7 is provided with an inner tube, a superconducting cable core housed in the inner tube, and a space portion evacuated between the inner tube and an outer peripheral portion of the inner tube. An outer tube disposed; a spacer disposed in the space portion and interspersed with a plurality of convex portions; and a heat insulating material disposed in the space portion so as to overlap the spacer.

In the superconducting cable according to claim 7, the spacer is dotted with a plurality of convex portions, and the convex portions contact with the outer peripheral surface of the inner tube or the inner peripheral surface of the outer tube as points (point contact). For example, the contact area is smaller than that in linear contact with the inner peripheral surface of the outer tube, such as a linear spacer, and heat is hardly transmitted between the inner tube and the outer tube. That is, the heat insulation performance is improved. Moreover, since a heat insulating material is arrange | positioned in a space part, heat insulation performance improves further. Furthermore, since the space part is made into the vacuum, the heat insulation performance improves more. In addition, since the heat insulating material is disposed so as to overlap with the spacer, the heat insulating material is prevented from being locally crushed by the weight of the inner tube or the bending of the heat insulating tube. Thereby, the fall of the heat insulation performance resulting from the local crushing of a heat insulating material is suppressed.
From the above, according to the superconducting cable according to claim 7, local crushing of the heat insulating material is suppressed, and the heat insulating performance is improved.

  As described above, the present invention can provide a heat insulating tube, a method for manufacturing a heat insulating tube, and a superconducting cable that can suppress local collapse of the heat insulating material and have improved heat insulating performance.

It is a partial longitudinal cross-sectional view of the heat insulation pipe | tube which concerns on 1st Embodiment of this invention. It is an enlarged view which shows the part pointed by the arrow 2 of the heat insulation pipe | tube shown by FIG. 1 in a partial cross section. FIG. 3 is a cross-sectional view of the heat insulating pipe shown in FIG. 1 taken along line 3-3. It is an expansion | deployment top view of the spacer used with the heat insulation pipe | tube shown by FIG. It is a perspective view which shows the manufacturing process of the heat insulation pipe | tube shown by FIG. It is a fragmentary longitudinal cross-sectional view of the modification of the heat insulation pipe | tube which concerns on 1st Embodiment of this invention. It is a partial longitudinal cross-sectional view of the heat insulation pipe | tube which concerns on 2nd Embodiment of this invention. It is a partial longitudinal cross-sectional view of the superconducting cable which concerns on 3rd Embodiment of this invention. FIG. 9 is a cross-sectional view of the superconducting cable shown in FIG. 8 taken along line 9-9.

<First Embodiment>
Hereinafter, with reference to FIGS. 1-5, the manufacturing method of the heat insulation pipe | tube and heat insulation pipe | tube which concern on 1st Embodiment of this invention is demonstrated.

  As shown in FIGS. 1 and 3, the heat insulating tube 20 of the present embodiment includes an inner tube 22 through which a fluid flows, and a space portion 24 provided between the inner tube 22 and an outer peripheral portion of the inner tube 22. The outer tube 26 arranged in the above manner, and the spacer 28 and the heat insulating material 30 arranged in the space 24 between the inner tube 22 and the outer tube 26 are provided. Examples of the fluid flowing in the inner tube 22 include liquid nitrogen, liquid oxygen, liquefied natural gas, steam, hot water, and the like.

  As shown in FIG. 1, in this embodiment, corrugated tubes made of metal (for example, made of stainless steel or aluminum) are used as the inner tube 22 and the outer tube 26.

As shown in FIGS. 1 and 2, a spacer 28 is disposed in the space portion 24 to maintain the distance between the inner tube 22 and the outer tube 26. The spacer 28 is a belt and is wound around the inner tube 22 in a spiral manner to cover the outer periphery of the inner tube 22. In other words, the spacer 28 is disposed between the inner tube 22 and the heat insulating material 30.
In the present embodiment, the width of the spacer 28 is 25 to 60 mm. This is because when the width of the spacer 28 is set to 10 mm or more, the winding work around the inner tube 22 described later is facilitated (that is, good workability is obtained). The width of the spacer of the present invention is not limited to the above configuration.

  As shown in FIGS. 2 and 3, the spacer 28 is dotted with a plurality of convex portions 32. The convex portion 32 protrudes toward the inner tube 22, and the distal end portion 32 </ b> A is in point contact with the inner peripheral surface of the inner tube 22. As shown in FIG. 2, in the present embodiment, the distal end portion 32 </ b> A of the convex portion 32 is a curved surface that curves so as to be convex toward the inner tube 22. Moreover, the convex part 32 is made into the convex shape which extruded a part of spacer 28, and the inside is hollow. By the plurality of convex portions 32, an uneven portion 34 is formed on the surface of the spacer 28 on the inner tube 22 side.

  As shown in FIG. 4, the concavo-convex portions 34 formed on the spacer 28 are arranged in a row at intervals in the longitudinal direction of the band (spacer 28) (the direction indicated by the arrow X in FIG. 4). Moreover, the uneven | corrugated | grooved part 34 of adjacent rows has shifted | deviated when it sees from the width direction (direction shown by arrow Y in FIG. 4) of a strip | belt body (spacer 28). In other words, the second row of convex portions 32 are arranged between the first row of convex portions 32 when viewed from the width direction of the band.

  The spacer 28 is made of a material having low heat transfer properties. Examples of the material having low heat transfer include PET resin, PP resin, and silicon resin.

  As shown in FIGS. 1 and 2, a metal layer 36 is formed on the surface 28 </ b> A of the spacer 28 on the outer tube 26 side. Specifically, the metal layer 36 is formed by vapor-depositing a metal material (for example, an aluminum film) on a substantially flat surface 28A on the side where the uneven portion 34 of the spacer 28 is not formed. The present invention is not limited to the above-described configuration, and a metal layer 36 may be formed by attaching a film-like metal material to the surface 28A of the spacer 28.

  As shown in FIGS. 1 and 2, a heat insulating material 30 is disposed in the space portion 24 on the outer tube 26 side of the spacer 28. The heat insulating material 30 is wound around the outer periphery of the inner tube 22 around which the spacer 28 is wound. The heat insulating material 30 of the present embodiment is a belt body obtained by vapor-depositing a metal material (for example, aluminum) on a resin film, and is wound around the outer periphery of the spacer 28.

  As shown in FIG. 2, the space portion 24 is evacuated and forms a vacuum layer between the inner tube 22 and the outer tube 26.

  Further, a coating material 38 is disposed on the outer periphery of the outer tube 26, and the outer tube 26 is covered with the coating material 38.

Next, the manufacturing method of the heat insulation pipe | tube 20 of this embodiment is demonstrated.
As shown in FIG. 5, first, a belt-like spacer 28 in which a plurality of convex portions 32 are dotted and a metal layer 36 is formed on a substantially flat surface 28 </ b> A is prepared. Is wound around the inner tube 22 so as to face the outer peripheral surface of the inner tube 22.

  Next, the belt-shaped heat insulating material 30 is wound around the inner tube 22 around which the spacer 28 is wound. The heat insulating material 30 may be formed in a plurality of layers on the outer periphery of the spacer 28 so as to have a multilayer structure.

Next, the inner tube 22 around which the heat insulating material 30 is wound is inserted into the outer tube 26.
Then, the heat insulation pipe | tube 20 is completed by covering the outer pipe | tube 26 with the coating | covering material 38. FIG.

  Here, in the manufacturing method of the heat insulation tube 20 of this embodiment, in order to make the heat insulation structure by winding the strip-shaped spacer 28, for example, a linear spacer is arranged on the surface of the heat insulation material to form the heat insulation structure. In comparison, it is easy to manufacture the heat insulating tube.

Next, the operation and effect of the heat insulating tube 20 of the present embodiment will be described.
In the heat insulating tube 20, a plurality of convex portions 32 are scattered on the spacer 28, and the convex portions 32 are in point contact with the outer peripheral surface of the inner tube 22. In comparison, the contact area is reduced, and heat is hardly transferred between the inner tube 22 and the outer tube 26. That is, the heat insulation performance is improved.

  In addition, since the plurality of convex portions 32 are interspersed in the spacer 28, for example, the heat insulating tube 20 is easily bent as compared with a case where a linear spacer is used. Furthermore, since the convex part 32 is protruded toward the inner tube 22 side, heat transfer from the outer tube 26 to the inner tube 22 can be effectively suppressed.

  Moreover, in the heat insulation pipe | tube 20, since the heat insulating material 30 is arrange | positioned in the space part 24, heat insulation performance improves further. Further, since the heat insulating material 30 is stacked on the substantially flat surface 28A of the spacer 28, the heat insulating material 30 is pressed against the convex portion of the inner tube 22 (corrugated tube) by the weight of the inner tube 22 or the bending of the heat insulating tube 20. And local collapse is suppressed. Thereby, the fall of the heat insulation performance resulting from local crushing of the heat insulating material 30 is suppressed.

  In the heat insulating tube 20, the belt-like spacer 28 formed with the concavo-convex portion 34 is wound around the inner tube 22, and therefore, the heat insulating tube 20 is easier to bend and handled than a configuration in which a single sheet-like spacer is wound, for example. It becomes easy.

  Further, in the heat insulating tube 20, the uneven portions 34 form a row at intervals in the longitudinal direction of the band, and the uneven portions 34 in adjacent rows are displaced when viewed from the width direction of the band. 28 is easy to bend and easy to wind around the inner tube 22.

  Furthermore, in the heat insulating pipe 20, since the metal layer 36 is formed on the surface 28A of the spacer 28, the metal layer 36 can prevent the intrusion of radiant heat from the outside or the dissipation of the radiant heat from the inside, so that the heat insulating performance is improved. improves. Therefore, the heat insulation effect of the inner tube 22 is improved.

  From the above, according to the heat insulating tube 20 of the present embodiment, local crushing of the heat insulating material 30 is suppressed and the heat insulating performance is improved. That is, in the heat insulation pipe | tube 20, the heat insulation performance as a whole can be improved, suppressing the fall of local heat insulation performance.

  In the heat insulating tube 20 of the present embodiment, corrugated tubes are used as the inner tube 22 and the outer tube 26, but the present invention is not limited to this configuration. For example, like the heat insulation pipe 40 (refer FIG. 6) which is a modification of the heat insulation pipe | tube 20, you may use the metal straight pipe | tube without an unevenness | corrugation on the surface as the inner pipe | tube 42 and the outer pipe | tube 44. FIG. The configuration of the straight pipe may be applied to a second embodiment described later.

  Moreover, in the heat insulation pipe | tube 20 of this embodiment, although the metal material is vapor-deposited on the surface 28A of the spacer 28, the metal layer 36 is formed, This invention is not limited to this structure. When a sufficient heat insulating effect is obtained by the spacer 28 and the heat insulating material 30, the metal layer 36 may be omitted. In addition, you may apply to the 2nd Embodiment mentioned later about the structure which abbreviate | omits this metal layer 36. FIG.

  Furthermore, in the heat insulating tube 20 of the present embodiment, the distal end portion 32A of the convex portion 32 is a curved surface that curves so as to be convex toward the inner tube 22, but the present invention is not limited to this configuration, and the convex portion The tip 32 </ b> A of the portion 32 may be a pointed tip that points toward the inner tube 22. Note that the shape of the distal end portion 32A of the convex portion 32 may be applied to a second embodiment described later.

Second Embodiment
Next, the heat insulation pipe | tube 50 which concerns on 2nd Embodiment of this invention is demonstrated based on FIG. In addition, the same code | symbol is attached | subjected about the structure similar to 1st Embodiment, and description is abbreviate | omitted suitably.

  As shown in FIG. 7, in the heat insulating tube 50 of the present embodiment, a spacer 52 is disposed in the space 24 in addition to the spacer 28 and the heat insulating material 30. In addition, the heat insulation pipe | tube 50 of this embodiment is using the structure similar to 1st Embodiment except the structure of the spacer 52. FIG.

  The spacer 52 is disposed between the heat insulating material 30 and the outer tube 26. Further, the spacer 52 has a belt shape and is wound around the outer periphery of the heat insulating material 30 in a spiral shape. The spacer 52 is dotted with a plurality of convex portions 54, and an uneven portion 56 is formed on the outer tube 26 side. The convex portion 54 protrudes toward the outer tube 26, and the distal end portion 54 </ b> A is in point contact with the inner peripheral surface of the outer tube 26. Note that the shape and arrangement of the convex portions 54 are the same as the shape and arrangement of the convex portions 32 of the spacer 28.

Next, the manufacturing method of the heat insulation pipe | tube 50 of this embodiment is demonstrated.
In the method of manufacturing the heat insulating tube 50, the spacer 28 is wound around the inner tube 22, the heat insulating material 30 is wound around the inner tube 22 around which the spacer 28 is wound, and then the protrusion of the spacer 52 is wound around the inner tube 22 around which the heat insulating material 30 is wound. It winds so that the part 54 may face the outer side (opposite side to the inner tube 22 side). At this time, the metal layer 58 formed on the substantially flat surface 52 </ b> A of the spacer 52 is overlaid on the heat insulating material 30. And like the manufacturing method of the heat insulation pipe | tube 20 which concerns on 1st Embodiment, the inner pipe | tube 22 in which the spacer 52 was wound is inserted in the outer pipe | tube 26, and the heat insulation pipe | tube 50 is covered with the coating | covering material 38. Is completed.

  Next, the operation and effect of the heat insulating tube 50 of this embodiment will be described. In addition, description is abbreviate | omitted about the effect | action and effect obtained by the structure similar to the heat insulation pipe | tube 20 which concerns on 1st Embodiment.

  In the heat insulating tube 50, a plurality of convex portions 54 are scattered on the spacer 52, and the convex portions 54 make point contact with the inner peripheral surface of the outer tube 26, so that heat is generated between the inner tube 22 and the outer tube 26. Is more difficult to transmit.

  Further, in the heat insulating tube 50, the heat insulating material 30 is sandwiched from both inside and outside by the metal layer 36 deposited on the substantially flat surface 28A of the spacer 28 and the metal layer 58 deposited on the substantially flat surface 52A of the spacer 52. Due to the structure, the insulating material 30 is prevented from being locally crushed by being pressed by the convex portion of the outer tube 26 (corrugated tube) due to the weight of the inner tube 22 or the bending of the heat insulating tube 50. Thereby, the fall of the heat insulation performance resulting from the local crushing of the heat insulating material 30 is suppressed effectively.

  In the heat insulating pipe 50 of the present embodiment, the spacer 28 and the spacer 52 are arranged on both the inside and outside of the heat insulating material 30, but the present invention is not limited to this structure. For example, the spacer 52 may be disposed on the outer periphery of the heat insulating material 30 and the spacer 28 may be omitted instead. For example, when the heat insulating material 30 has a multilayer structure, a spacer having the same configuration as the spacer 28 (the convex portion 32 faces inward) or the spacer 52 (the convex portion 54 faces outward) may be disposed between the layers. Good.

<Third Embodiment>
Next, a superconducting cable 60 according to a third embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected about the structure similar to 1st Embodiment, and description is abbreviate | omitted suitably.

  As shown in FIGS. 8 and 9, the superconducting cable 60 of the present embodiment includes a heat insulating tube 20 according to the first embodiment and a cable core 62 accommodated in the inner tube 22 of the heat insulating tube 20 in a cooled state. And have.

  The cable core 62 is formed by winding a number of superconducting wires (not shown) in a spiral shape around a former (not shown) formed of a metal material (for example, copper) having excellent conductivity, and an insulating layer (not shown) on the spiral. A superconducting shield layer not provided and a protective layer not shown are provided.

  Further, in the superconducting cable 60 of the present embodiment, the cable core 62 is cooled by flowing liquid nitrogen, which is an example of a refrigerant, between the inner tube 22 and the cable core 62.

  Next, the operation and effect of the superconducting cable 60 of this embodiment will be described. In addition, description is abbreviate | omitted about the effect | action and effect obtained by the structure similar to the heat insulation pipe | tube 20 which concerns on 1st Embodiment.

  In the superconducting cable 60, due to the heat insulating effect of the heat insulating tube 20, heat from the outside is hardly transmitted to the inner tube 22, and the cooling state of the cable core 62 can be efficiently maintained.

  In the superconducting cable 60 of the present embodiment, the cable core 62 is accommodated in the cooled state in the inner tube 22 of the heat insulating tube 20, but the present invention is not limited to this configuration, and the heat insulating tube 50 of the second embodiment. The cable core 62 may be accommodated in the inner pipe 22 in a cooled state.

  The embodiments of the present invention have been described above with reference to the embodiments. However, these embodiments are merely examples, and various modifications can be made without departing from the scope of the invention. It goes without saying that the scope of rights of the present invention is not limited to these embodiments.

20, 40, 50 Insulated pipe 22, 42 Inner pipe 24 Space part 26, 44 Outer pipe 28, 52 Spacer 28A, 52A surface (one surface)
30 Heat insulating material 32, 54 Convex part 34, 56 Concave part 36, 58 Metal layer 60 Superconducting cable 62 Cable core

Claims (7)

An inner pipe,
An outer tube disposed on the outer periphery of the inner tube with a space provided between the inner tube,
A spacer disposed in the space and interspersed with a plurality of convex portions;
A heat insulating material arranged to overlap the spacer in the space;
Insulated pipe.   The heat insulating pipe according to claim 1, wherein the spacer is a belt and is wound around the inner pipe.   The heat insulation pipe | tube of Claim 1 or Claim 2 with which the metal layer was formed in one surface of the said spacer.   The heat insulation pipe according to any one of claims 1 to 3, wherein the spacer is disposed between the inner pipe and the heat insulating material, and the convex portion is directed to the inner pipe side.   The heat insulation pipe according to any one of claims 1 to 4, wherein a superconducting cable core is housed in the inner pipe, and the space is evacuated. A step of winding a strip-shaped spacer dotted with convex portions around the inner tube;
Winding a strip-shaped heat insulating material around the inner tube around which the spacer is wound;
Inserting the inner tube wrapped with the heat insulating material into the outer tube;
The manufacturing method of the heat insulation pipe | tube which has. An inner pipe,
A superconducting cable core housed in the inner tube;
An outer tube disposed on the outer periphery of the inner tube by providing a vacuum space between the inner tube and the inner tube;
A spacer disposed in the space and interspersed with a plurality of convex portions;
A heat insulating material arranged to overlap the spacer in the space;
Superconducting cable having

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