阅读说明：本技术 流体装卸接头和流体装卸装置 (Fluid handling joint and fluid handling device ) 是由 梅村友章 河合务 于 2018-12-26 设计创作，主要内容包括：流体装卸接头具有：第1半部,其设置于第1真空双重管的前端,包含第1内管、第1外管以及将第1内管与第1外管之间封闭的第1封闭部件；第2半部,其设置于第2真空双重管的前端,包含第2内管、第2外管以及将第2内管与第2外管之间封闭的第2封闭部件；环状的内侧绝缘材料,其介于第1内管与第2内管之间；以及环状的外侧绝缘材料,其隔着形成在第1封闭部件与第2封闭部件之间的气体空间而包围内侧绝缘材料,并且介于第1外管与第2外管之间。(The fluid handling joint comprises: a 1 st half part which is provided at the tip of the 1 st vacuum double tube and includes a 1 st inner tube, a 1 st outer tube, and a 1 st sealing member which seals a gap between the 1 st inner tube and the 1 st outer tube; a 2 nd half part which is provided at a tip of the 2 nd vacuum double tube and includes a 2 nd inner tube, a 2 nd outer tube, and a 2 nd sealing member which seals a space between the 2 nd inner tube and the 2 nd outer tube; an annular inner insulating material interposed between the 1 st inner tube and the 2 nd inner tube; and an annular outer insulating material surrounding the inner insulating material with a gas space formed between the 1 st and 2 nd sealing members and interposed between the 1 st and 2 nd outer tubes.)

1. A fluid handling joint, comprising:

a 1 st half part which is provided at a tip of a 1 st vacuum double tube, and includes a 1 st inner tube, a 1 st outer tube, and a 1 st sealing member, wherein a vacuum space is formed between the 1 st inner tube and the 1 st outer tube, and the 1 st sealing member seals a gap between the 1 st inner tube and the 1 st outer tube;

a 2 nd half portion provided at a tip of the 2 nd vacuum double tube, including a 2 nd inner tube, a 2 nd outer tube, and a 2 nd sealing member, wherein a vacuum space is formed between the 2 nd inner tube and the 2 nd outer tube, the 2 nd sealing member seals a space between the 2 nd inner tube and the 2 nd outer tube, and a gas space filled with gas is formed between the 1 st sealing member and the 2 nd sealing member;

an annular inner insulating material interposed between the 1 st inner tube and the 2 nd inner tube; and

and an annular outer insulating material that surrounds the inner insulating material with the gas space therebetween and is interposed between the 1 st outer tube and the 2 nd outer tube.

2. The fluid handling joint of claim 1,

the 1 st inner pipe is provided with a 1 st inner flange at the tail end,

a 2 nd inner side flange is arranged at the tail end of the 2 nd inner pipe,

the inner insulating material is interposed between the 1 st and 2 nd inner flanges.

3. The fluid handling joint of claim 2,

the fluid handling joint is a swivel joint,

the 1 st half portion includes a holder for rotatably holding the 1 st outer tube,

an outer flange fastened to the holder is provided at the end of the 2 nd outer tube,

the outboard insulation material is interposed between the cage and the outboard flange.

4. The fluid handling joint of claim 3,

the fluid handling joint further having a spacer interposed between the 1 st and 2 nd inner flanges, fastened to the 2 nd inner flange and sliding relative to the 1 st inner flange,

the inner insulating material is sandwiched between the spacer and the 2 nd inner flange.

5. The fluid handling joint of claim 2,

the fluid handling joint is a fixed joint,

the 1 st outer pipe is provided with a 1 st outer flange at the tail end,

a 2 nd outer flange fastened to the 1 st outer flange is provided at an end of the 2 nd outer pipe,

the inner insulating material is sandwiched between the 1 st and 2 nd inner flanges,

the outer insulating material is sandwiched between the 1 st and 2 nd outer flanges.

6. The fluid handling joint of claim 5,

the fluid handling joint also has a positioning mechanism that constrains radial movement of the inner insulation.

7. A fluid handling device comprising a fluid handling joint according to any of claims 1 to 6.

Technical Field

The present invention relates to a fluid handling joint for connecting vacuum double pipes to each other and a fluid handling device including the fluid handling joint.

Background

In recent years, a fluid handling device (loading arm) for liquefied hydrogen installed in an estuary or the like has been developed. A vacuum double pipe having high heat insulation performance is used for such a fluid handling device. The vacuum double pipe includes a conduit through which liquefied hydrogen flows and a storage pipe for storing the conduit, and a space between the conduit and the storage pipe is evacuated.

The fluid handling joint connecting the double vacuum pipes to each other also requires high heat insulating performance as in the double vacuum pipes. For example, patent document 1 discloses a fluid handling joint 100 shown in fig. 5. The fluid handling joint 100 is a rotary joint, and includes a 1 st half 110 provided at the tip of a 1 st double vacuum pipe 101 and a 2 nd half 120 provided at the tip of a 2 nd double vacuum pipe 102.

In the 1 st half 110, a 1 st vacuum space 113 is formed between the 1 st inner tube 111 and the 1 st outer tube 112, and a 1 st closing member 114 closes between the 1 st inner tube 111 and the 1 st outer tube 112. The 1 st half 110 includes a holder 116 for rotatably holding the 1 st outer tube 112.

In the 2 nd half part 120, a 2 nd vacuum space 123 is formed between the 2 nd inner tube 121 and the 2 nd outer tube 122, and a 2 nd closing member 124 closes between the 2 nd inner tube 121 and the 2 nd outer tube 122. Further, an outer flange 126 is provided at the tip of the 2 nd outer tube 122, and the outer flange 126 is fastened to the holder 116 of the 1 st half 110 by a bolt 130.

The 1 st closing member 114 is positioned inward of the joint surface of the 1 st half 110, and the 2 nd closing member 124 is positioned inward of the joint surface of the 2 nd half 120. Further, a gas space 140 is formed between the 1 st closing member 114 and the 2 nd closing member 124. Helium gas is filled in the gas space 140 through the port member 150.

Disclosure of Invention

Problems to be solved by the invention

For a fluid handling joint to be disposed at a specific location of a fluid handling device, it is required that the 1 st half and the 2 nd half be electrically insulated. However, if only one annular insulating sheet is sandwiched between the 1 st half and the 2 nd half, external heat enters the flow path by heat conduction through the insulating sheet, and therefore there is a possibility that the heat insulating performance is deteriorated.

Accordingly, an object of the present invention is to provide a fluid handling joint in which the 1 st half and the 2 nd half can be electrically insulated and which has high heat insulating performance, and a fluid handling device including the fluid handling joint.

Means for solving the problems

In order to solve the above problem, a fluid handling joint according to the present invention includes: a 1 st half part which is provided at a tip of a 1 st vacuum double tube, and includes a 1 st inner tube, a 1 st outer tube, and a 1 st sealing member, wherein a vacuum space is formed between the 1 st inner tube and the 1 st outer tube, and the 1 st sealing member seals a gap between the 1 st inner tube and the 1 st outer tube; a 2 nd half portion provided at a tip of the 2 nd vacuum double tube, including a 2 nd inner tube, a 2 nd outer tube, and a 2 nd sealing member, wherein a vacuum space is formed between the 2 nd inner tube and the 2 nd outer tube, the 2 nd sealing member seals a space between the 2 nd inner tube and the 2 nd outer tube, and a gas space filled with gas is formed between the 1 st sealing member and the 2 nd sealing member; an annular inner insulating material interposed between the 1 st inner tube and the 2 nd inner tube; and an annular outer insulating material surrounding the inner insulating material with the gas space therebetween and interposed between the 1 st outer tube and the 2 nd outer tube.

According to the above configuration, since the inner insulating material is interposed between the 1 st inner tube and the 2 nd inner tube and the outer insulating material is interposed between the 1 st outer tube and the 2 nd outer tube, the 1 st half portion and the 2 nd half portion can be electrically insulated. Further, since the inner insulating material and the outer insulating material are separated from each other with a gas space therebetween, transmission of external heat from the outer insulating material to the inner insulating material is suppressed. Therefore, high heat insulating performance can be obtained.

For example, a 1 st inner flange may be provided at a distal end of the 1 st inner tube, a 2 nd inner flange may be provided at a distal end of the 2 nd inner tube, and the inner insulating material may be interposed between the 1 st inner flange and the 2 nd inner flange.

The fluid handling joint may be a rotary joint, the 1 st half portion may include a cylindrical holder for rotatably holding the 1 st outer pipe, an outer flange fastened to the holder may be provided at an end of the 2 nd outer pipe, and the outer insulating material may be interposed between the holder and the outer flange. According to this structure, the outer insulating material can be fixed by the fastening structure of the outer flange to the holder.

The fluid handling joint may further include a spacer interposed between the 1 st inner flange and the 2 nd inner flange, fastened to the 2 nd inner flange and slidable relative to the 1 st inner flange, wherein the inner insulating material is sandwiched between the spacer and the 2 nd inner flange. According to this structure, the gap of the sliding portion can be kept small by the spacer, and the inner insulating material can be fixed with a simple structure.

For example, the fluid handling joint may be a fixed joint, the 1 st outer pipe may have a 1 st outer flange provided at a distal end thereof, the 2 nd outer pipe may have a 2 nd outer flange fastened to the 1 st outer flange provided at a distal end thereof, the inner insulating material may be sandwiched between the 1 st inner flange and the 2 nd inner flange, and the outer insulating material may be sandwiched between the 1 st outer flange and the 2 nd outer flange.

The fluid handling joint may further include a positioning mechanism for restricting radial movement of the inner insulating material. With this configuration, the inner insulating material can be maintained at a regular position.

The fluid handling device of the present invention is characterized by comprising the fluid handling joint.

Effects of the invention

According to the present invention, there is provided a fluid handling joint in which the 1 st half and the 2 nd half can be electrically insulated and which has high heat insulating performance.

Drawings

Fig. 1 is a sectional view of a fluid handling joint according to embodiment 1 of the present invention.

Fig. 2 is an enlarged view of a portion of fig. 1.

Fig. 3 is an enlarged cross-sectional view of a part of a fluid handling joint according to embodiment 2 of the present invention.

Fig. 4 is a diagram showing a modification of embodiment 2.

Fig. 5 is a cross-sectional view of a conventional fluid handling joint.

Detailed Description

(embodiment 1)

Fig. 1 and 2 show a fluid handling joint 1A according to embodiment 1 of the present invention. The fluid handling joint 1A constitutes a part of a fluid handling device (loading arm) 10 for liquid hydrogen connected to a liquefied hydrogen carrier or the like.

The fluid handling joint 1A connects the 1 st vacuum double pipe 11 and the 2 nd vacuum double pipe 14. In the present embodiment, the fluid handling joint 1A is a rotary joint. The fluid handling joint 1A includes a 1 st half 2 provided at the tip of a 1 st double vacuum pipe 11 and a 2 nd half 3 provided at the tip of a 2 nd double vacuum pipe 14.

The 1 st vacuum double pipe 11 includes a 1 st conduit 12 through which liquefied hydrogen flows and a 1 st storage pipe 13 for storing the 1 st conduit 12, and a space between the 1 st conduit 12 and the 1 st storage pipe 13 is evacuated. Similarly, the 2 nd vacuum double pipe 14 includes a 2 nd conduit 15 through which liquefied hydrogen flows and a 2 nd storage pipe 16 for storing the 2 nd conduit 15, and a space between the 2 nd conduit 15 and the 2 nd storage pipe 16 is evacuated.

The 1 st half 2 includes a 1 st inner tube 21 and a 1 st outer tube 22 that receives the 1 st inner tube 21. The 1 st catheter 12 is joined to the base end (the end on the opposite side to the 2 nd half 3) of the 1 st inner tube 21 by welding or the like, and the 1 st storage tube 13 is joined to the base end of the 1 st outer tube 22 by welding or the like. A 1 st vacuum space 23 is formed between the 1 st inner tube 21 and the 1 st outer tube 22. The base end of the 1 st inner tube 21 and the base end of the 1 st outer tube 22 may be shifted in position in the axial direction.

Similarly, the 2 nd half 3 includes a 2 nd inner tube 31 and a 2 nd outer tube 32 that receives the 2 nd inner tube 31. The 2 nd guide tube 15 is joined by welding or the like to a base end (end on the opposite side to the 1 st half 2) of the 2 nd inner tube 31, and the 2 nd storage tube 16 is joined by welding or the like to a base end of the 2 nd outer tube 32. A 2 nd vacuum space 33 is formed between the 2 nd inner tube 31 and the 2 nd outer tube 32. The base end of the 2 nd inner tube 31 and the base end of the 2 nd outer tube 32 may be shifted in position in the axial direction.

In the 1 st outer tube 22 and the 2 nd outer tube 32, the portions other than the base end side portion are respectively enlarged in diameter. In the present embodiment, as described above, the fluid handling joint 1A is a rotary joint, the 1 st half 2 is a movable side, and the 2 nd half 3 is a fixed side. Therefore, the inner diameter of the end of the 2 nd outer tube 32 is larger than that of the end of the 1 st outer tube 22.

The 1 st half 2 further includes an annular 1 st closing member 41 for closing a gap between the 1 st inner tube 21 and the 1 st outer tube 22. In the present embodiment, the 1 st closing member 41 is located further inward than the joint surface of the 1 st half 2 (a distal end side end surface of the 1 st inner flange 24 and a distal end side end surface of the holder 25, which will be described later). In the present embodiment, the end portion on the inner side of the 1 st closing member 41 is joined to the base end side end surface of the 1 st inner flange 24 provided at the tip end of the 1 st inner tube 21. The outer end of the 1 st closing member 41 is joined to the inner peripheral surface of the 1 st outer tube 22 at a position slightly closer to the base end side than the tip (end on the 2 nd half 3 side) of the 1 st outer tube 22.

The 1 st closing member 41 has at least one annular groove 42 recessed into the 1 st vacuum space 23 along the 1 st inner tube 21. However, it is preferable that the 1 st closing member 41 is provided with a plurality of concentric annular grooves 42 in a corrugated shape in cross section. In the present embodiment, the 1 st closing member 41 has two concentric annular grooves 42. The depth of the annular groove 42 is preferably as deep as possible. For example, the depth of the annular groove 42 may be larger than the distance from the 1 st inner tube 21 to the 1 st outer tube 22 at the position where the 1 st closing member 41 is present.

The 1 st vacuum space 23 is defined between the 1 st closing member 41 and the 1 st inner tube 21, between the 1 st closing member 41 and the 1 st outer tube 22, and between the annular grooves 42 of the 1 st closing member 41. On the other hand, as will be described later, helium gas is filled in the annular groove 42. Therefore, the vacuum layer and the helium layer are alternately formed in the radial direction by the 1 st closing member 41.

Similarly, the 2 nd half portion 3 further includes an annular 2 nd closing member 43 for closing a gap between the 2 nd inner tube 31 and the 2 nd outer tube 32. In the present embodiment, the 2 nd closing member 43 is located further inward than the joint surface of the 2 nd half 3 (a distal end side end surface of the 2 nd inner flange 34 and a distal end side end surface of the 2 nd outer flange 35, which will be described later). In the present embodiment, the end portion on the inner side of the 2 nd closing member 43 is joined to the base end side end surface of the 2 nd inner flange 34 provided at the tip end of the 2 nd inner tube 31. The outer end of the 2 nd closing member 43 is joined to the inner peripheral surface of the 2 nd outer tube 32 at a position slightly closer to the base end side than the tip (the 1 st half 2 side end) of the 2 nd outer tube 32.

The 2 nd closing member 43 has at least one annular groove 44 recessed into the 2 nd vacuum space 33 along the 2 nd inner tube 31. However, it is preferable that the 2 nd closing member 43 is provided with a plurality of concentric annular grooves 44 in a corrugated shape in cross section. In the present embodiment, the 2 nd closing member 43 has three concentric annular grooves 44. The depth of the annular groove 44 is preferably as deep as possible. For example, the depth of the annular groove 44 may be larger than the distance from the 2 nd inner tube 31 to the 2 nd outer tube 32 at the position where the 2 nd closing member 43 is present.

The 2 nd vacuum space 33 is defined between the 2 nd closing member 43 and the 2 nd inner tube 31, between the 2 nd closing member 43 and the 2 nd outer tube 32, and between the annular grooves 44 of the 2 nd closing member 43. On the other hand, helium gas is filled in the annular groove 44 as described later. Therefore, the vacuum layer and the helium layer are alternately formed in the radial direction by the 2 nd closing member 43.

An annular inner spacer 61 and an annular inner insulating material 51 are interposed between the 1 st inner flange 24 and the 2 nd inner flange 34. A cylindrical holder 25, an annular outer spacer 62, and an annular outer insulating material 52 are interposed between the 1 st outer tube 22 and the 2 nd outer tube 32.

The retainer 25 is a component of the 1 st half 2, and rotatably retains the 1 st outer tube 22 via a bearing 26. On the other hand, a 2 nd outer flange 35 is provided at the tip of the 2 nd outer tube 32. The outer spacer 62 and the outer insulating material 52 are interposed between the holder 25 and the 2 nd outer flange 35. More specifically, the outer insulating material 52 is sandwiched between the outer spacer 62 and the 2 nd outer flange 35.

The 2 nd outer flange 35 is fastened to the holder 25 by bolts 91. Through-insertion holes for bolts 91 are provided in the outer insulating material 52 and the outer spacers 62. In the present embodiment, the holder 25 is provided with a screw hole to be screwed with the bolt 91, but a through insertion hole may be provided instead of the screw hole and a nut may be used.

The inner spacer 61 is disposed inside the outer spacer 62, and has the same thickness as the outer spacer 62. However, the thicknesses of the inner spacer 61 and the outer spacer 62 may be different. The inner spacer 61 and the outer spacer 62 are made of metal.

The inner insulating member 51 is disposed inside the outer insulating member 52 and has the same thickness as the outer insulating member 52. However, the thicknesses of the inner insulating material 51 and the outer insulating material 52 may be different. The inner insulating material 51 and the outer insulating material 52 are made of an insulating material (for example, a resin such as general-purpose plastic or engineering plastic).

The inner spacer 61 is fastened to the 2 nd inner flange 34 by a bolt 92 and slides with respect to the 1 st inner flange 24. A seal member 71 for preventing leakage of liquefied hydrogen through a gap between the 1 st inner flange 24 and the inner spacer 61 is disposed between them. Further, a slight gap is secured between the 1 st inner flange 24 and the inner spacer 61, and the seal member 71 held by the 1 st inner flange 24 slides on the inner spacer 61. In the present embodiment, the ring 46 is fitted to the end of the 1 st inner tube 21 so as to cover the inner seal member 71 from the inside.

The inner insulating material 51 is sandwiched between the inner spacer 61 and the 2 nd inner flange 34. The inner insulating member 51 is provided with insertion holes for the bolts 92. Sealing members 72 and 73 for preventing leakage of liquefied hydrogen through gaps between the inner spacer 61 and the inner insulating material 51 and between the inner insulating material 51 and the No. 2 inner flange 34 are disposed.

The gap between the inner spacer 61 and the outer spacer 62 and the gap between the inner insulating material 51 and the outer insulating material 52 communicate with a space with the 1 st closing member 41 between the ends of the 1 st inner tube 21 and the 1 st outer tube 22 and a space with the 2 nd closing member 43 between the ends of the 2 nd inner tube 31 and the 2 nd outer tube 32. These gaps and spaces constitute gas spaces 45. In other words, a gas space 45 is formed between the 1 st closing member 41 and the 2 nd closing member 43, and the outer spacer 62 and the outer insulating material 52 surround the inner spacer 61 and the inner insulating material 51 with the gas space 45 therebetween, respectively.

Helium gas is filled in the gas space 45. A port member 27 for supplying helium gas to the gas space 45 through a gap between the 1 st outer tube 22 and the holder 25 is mounted on the holder 25.

A seal member 74 for preventing moisture from entering from the outside is disposed between the 1 st outer tube 22 and the retainer 25. Further, sealing members 75 to 77 are disposed between the holder 25, the outer spacer 62, the outer insulating member 52, and the 2 nd outer flange 35, and the sealing members 75 to 77 are used to prevent the leakage of the hydrogen gas to the outside even if the liquefied hydrogen passes over the sealing members 71, 72, 73 and leaks into the gas space 45. These seal members 74 to 77 also function to prevent leakage of helium gas to the outside.

The bolts 91 for fastening the 2 nd outer flange 35 to the retainer 25 are made of metal. Therefore, the sleeve 81 made of an insulating material is inserted into the insertion hole for the bolt 91 provided in the outer insulating material 52 and the outer spacer 62. Further, a sheet (seat)82 made of an insulating material is disposed between the washer 83 contacting the head of the bolt 91 and the 2 nd outer flange 35.

On the other hand, the bolt 92 for fastening the inner spacer 61 to the 2 nd inner flange 34 is made of an insulating material. However, bolt 92 may be made of metal, and the same insulation measures as those of bolt 91 may be applied to bolt 92.

As described above, in the fluid handling joint 1A of the present embodiment, the inner insulating material 51 is interposed between the 1 st inner tube 21 and the 2 nd inner tube 31, and the outer insulating material 52 is interposed between the 1 st outer tube 22 and the 2 nd outer tube 32, so that the 1 st half portion 2 and the 2 nd half portion 3 can be electrically insulated from each other. Further, since the inner insulating member 51 and the outer insulating member 52 are separated from each other with the gas space 45 interposed therebetween, transmission of external heat from the outer insulating member 52 to the inner insulating member 51 is suppressed. Therefore, high heat insulating performance can be obtained.

In the present embodiment, since the outer insulating member 52 is interposed between the holder 25 and the 2 nd outer flange 35, the outer insulating member 52 can be fixed by the fastening structure (i.e., the bolts 91) of the 2 nd outer flange 35 to the holder 25.

Further, in the present embodiment, since the inner insulating material 51 is sandwiched between the inner spacer 61 and the 2 nd inner flange 34, the gap of the sliding portion can be kept small by the inner spacer 61, and the inner insulating material 51 can be fixed with a simple configuration.

(embodiment 2)

Fig. 3 shows a fluid handling joint 1B according to embodiment 2 of the present invention. In the present embodiment, the same components as those in embodiment 1 are denoted by the same reference numerals, and redundant description thereof is omitted.

In the present embodiment, the fluid handling joint 1B is a fixed joint. Thus, the 1 st half 2 and the 2 nd half 3 have mutually symmetrical shapes.

Specifically, in the 1 st half 2, a 1 st outer flange 28 is provided at the tip of the 1 st outer tube 22. The 2 nd outer flange 35 provided at the distal end of the 2 nd outer tube 32 is fastened to the 1 st outer flange 28 by a bolt 91 and a nut 93. In the present embodiment, a washer 83 and a sheet (seat)82 made of an insulating material are further disposed between the nut 93 and the 1 st outer flange 28.

In the present embodiment, the inner insulating material 51 is sandwiched between the 1 st inner flange 24 and the 2 nd inner flange 34, and the outer insulating material 52 is sandwiched between the 1 st outer flange 28 and the 2 nd outer flange 35. Sealing members 72 and 73 for preventing leakage of liquefied hydrogen through gaps between the 1 st inner flange 24 and the inner insulating member 51 and between the inner insulating member 51 and the 2 nd inner flange 34 are disposed.

In the present embodiment, the gas space 45 formed between the 1 st closing member 41 and the 2 nd closing member 43 is filled with hydrogen gas. The hydrogen gas is obtained by vaporizing liquefied hydrogen leaking through the gap between the 1 st inner flange 24 and the inner insulating material 51 and the gap between the inner insulating material 51 and the 2 nd inner flange 34. Sealing members 75 to 77 for preventing leakage of hydrogen gas through gaps between the 1 st outer flange 28 and the outer insulating member 52 and between the outer insulating member 52 and the 2 nd outer flange 35 are disposed.

In the present embodiment, a positioning mechanism 55 is used to restrict the radial movement of the inner insulating material 51. The positioning means 55 of the present embodiment is a protrusion 56 provided at the outer peripheral edge of the inner insulating material 51 and protruding along the outer peripheral surface of the 2 nd inner flange 34.

In the present embodiment, as in embodiment 1, half 1 and half 2 can be electrically insulated from each other, and high heat insulating performance can be obtained. In the present embodiment, since the positioning mechanism 55 is used, the inner insulating member 51 can be maintained at a proper position.

The positioning means 55 need not necessarily be the protrusion 56 provided on the outer peripheral edge of the inner insulating material 51. For example, as shown in fig. 4, the positioning mechanism 55 may be a protrusion 57 that is provided on the 1 st inner flange 24 and engages with the outer peripheral surface of the inner insulating member 51.

(other embodiments)

The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

For example, in embodiment 1, the outer spacer 62 may be omitted, and either the 1 st outer tube 22 or the 2 nd outer tube 32 may be extended by the thickness of the outer spacer 62.

Description of the reference symbols

1A, 1B: a fluid handling joint; 10: a fluid handling device; 2: half 1; 21: 1, an inner pipe; 22: 1, an outer tube; 23: 1 st vacuum space; 24: 1 st inboard flange; 25: a holder; 28: 1 st outer flange; 3: the 2 nd half part; 31: a 2 nd inner tube; 32: a 2 nd outer tube; 33: a 2 nd vacuum space; 34: a 2 nd inner flange; 35: a 2 nd outer flange; 41: 1 st closing member; 43: a 2 nd closing member; 45: a gas space; 51: an inner insulating material; 52: an outer insulating material; 55: a positioning mechanism; 61. 62: a spacer.