JP2020063791A - Heat insulation body for branch pipe joint, and heat insulation method of branch pipe joint - Google Patents

Abstract

To simplify a heat insulation work at a job site by standardizing specifications of a heat insulation body in performing a heat insulation treatment on a branch pipe joint.SOLUTION: In a heat insulation body for covering a branch pipe joint, the branch pipe joint has three connection portions respectively disposed from different three directions, and a block having a confluent portion communicated with three connection portions inside. The heat insulation body has a cylindrical first heat insulation body composed of a resin-based heat insulation material, and a second heat insulation body having a through port to which the first connection portion among three connection portions can be inserted, and composed of a resin-based heat insulating material, and the first heat insulation body has a cutout having a size to cover the block, and the second connection portion and the third connection portion among three connection portions, and corresponded to the first connection portion from one end portion of the first heat insulation body along a longitudinal direction of the first heat insulation body.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a heat insulator for a branch pipe joint and a heat insulating method for the branch pipe joint.

  The branch pipe joint of the refrigerant pipe is provided with a heat insulating material on the outer side thereof, but in order to reduce the trouble of construction on site as much as possible, the pipe heat insulation system member shown in Patent Document 1 has been conventionally proposed.

  The technique disclosed in Patent Document 1 is a pipe heat insulation system member for heat insulating a pipe constituted by a straight pipe or a bent pipe and an accessory that connects these pipes. A combination of a pipe covering member made of a resin-based foam molded product arranged so as to cover the outer peripheral surface of the product, and an accessory covering member arranged so as to cover the outer surface of the accessory. The adhesive surface is applied to the joint surface of the foamed molded article with the tube covering member.

Utility model registration No. 3191398

  However, according to such a conventional technique, it is necessary to prepare a resin-based foam molded article in advance, but there are many types of pipe diameters, and it is necessary to prepare a large number of resin-based foam molded articles accordingly. There is. Moreover, in the case of applying to a branch pipe joint, when the diameters of the three pipes are different from each other, it is necessary to prepare more resin-based foamed molded products accordingly.

  The present invention has been made in view of such a point, in performing a heat treatment on the branch pipe joint, without preparing a large number of resin-based foam molded products according to the branch pipe joint as described above, and The purpose is to facilitate work on site.

  In order to achieve the above-mentioned object, the present invention is a heat insulating body (for example, a heat insulating body 10 for a branch pipe joint) covering a branch pipe joint (for example, the branch pipe joint 100), wherein the branch pipe joints are different from each other. A block in which three connection parts (for example, first to third connection parts 101, 102, 103) provided respectively from three directions and a confluence part communicating with each of the three connection parts are formed inside (for example, And a tubular first heat insulator (for example, the first heat insulator 20) made of a resin-based heat insulating material, and the three connecting portions. A second heat insulator (for example, a second heat insulator 30) made of a resin-based heat insulating material having a through hole (for example, a through hole 31) through which the first connecting portion can be inserted, The first heat insulator is the block and the first of the three connecting portions. And a cut corresponding to the first connecting portion along the longitudinal direction of the first heat insulating body from one end of the first heat insulating body (see FIG. For example, it is characterized in that a cut 21) is formed. According to this, there is no need to use a heat insulator formed by a mold according to the shape of the branch pipe joint.

  The length of the cut formed in the first heat insulator may be 1/3 to 2/3 of the entire length of the first heat insulator from one end of the first heat insulator. According to this, the portion where the notch of the first heat insulator is formed and the portion where the notch is not formed and which is formed in a tubular shape are balanced, and the second connection portion or the third connection portion is formed. At least one of the portions can be appropriately covered with the tubular portion of the first heat insulator to be thermally insulated. Further, the other one of the second connecting portion and the third connecting portion is formed into a substantially cylindrical shape by adhering the insides of the formed cuts to each other, so that proper heat insulation can be performed.

  The block of the branch pipe joint further has a surface portion (for example, a flat surface 104a) provided with the first connection portion protruding, and the second heat insulator has a coating surface corresponding to the surface portion. You may have. According to this, the second heat insulator can be attached more stably, and the gap generated in the cut portion of the first heat insulator can be suitably closed. The shape of the surface of the block may be flat or curved.

  In the branch pipe joint, the angle formed by the second connecting portion and the third connecting portion may be set to 135 degrees. According to this, the angle at which the first heat insulator is bent becomes loose, so that the burden is less likely to occur. Further, since the deflection and the like are reduced, the branch pipe joint can be heat-insulated more preferably.

  Furthermore, a cutout (for example, a cutout 21b) corresponding to the first connection portion may be formed in the cut in the first heat insulator. According to this, when the cut of the first heat insulator sandwiches the first connection portion, the deformation of the cut surface of the first heat insulator can be suppressed.

The second heat insulator may be formed with a notch (for example, notch 32) that reaches the through hole from one end of the second heat insulator. According to this, when adhering the second heat insulating body, the second heat insulating body is not passed through from the end of the first connecting portion, so that the working efficiency is improved.

  According to another aspect, the present invention heat-insulates a branch pipe joint having three connecting portions respectively provided from three different directions and a block in which a merging portion communicating with each of the three connecting portions is formed inside. And a first step of inserting a second connecting portion of the three connecting portions into one end of a cylindrical first heat insulating body made of a resin-based heat insulating material. The block is formed so that the first connection part of the three connection parts corresponds to a notch formed from one end of the first heat insulation part along the longitudinal direction of the first heat insulation part. A second procedure of covering with a heat insulator, a third procedure of covering a third connecting portion of the three connecting portions with the first heat insulating body, and a form of sandwiching the first connecting portion. The fourth step of adhering the one end of the notch and the first connecting portion can be inserted A fifth step of inserting the first connecting portion into the through hole of the second heat insulator, which is a resin-based heat insulating material having a through hole, and the second heat insulator including the first heat insulator. And a sixth step of adhering to the body.

  According to the present invention, when heat insulating treatment is applied to a branch pipe joint, it is not necessary to prepare a large number of resin-based foam molded products as described above according to the shape of the branch pipe. Insulation work at the site is also easy.

It is a perspective view of a branch pipe joint covered with a heat insulator for a branch pipe joint concerning an embodiment. It is a side view of the branch pipe joint of FIG. It is a perspective view of the heat insulation body for branch pipe joints concerning an embodiment, (a) shows the 1st heat insulation body, and (b) shows the 2nd heat insulation body. It is a perspective view which shows the mode of the attachment start of a 1st heat insulating body. It is a perspective view which shows the state in the middle of attachment of a 1st heat insulating body. It is a perspective view which shows the mode of attachment of a 2nd heat insulating body. It is a perspective view of the branch pipe joint unit covered with the heat insulator for branch pipe joints concerning an embodiment. FIG. 8 is a side sectional view showing a state in which another connecting pipe is connected to the branch pipe joint unit of FIG. 7. It is a perspective view of the heat insulation body for branch pipe joints concerning other embodiment, (a) shows the 1st heat insulation body, and (b) shows the 2nd heat insulation body.

  Hereinafter, the present embodiment will be described with reference to the drawings. In the present specification, elements having substantially the same functional configuration will be denoted by the same reference numeral, and redundant description will be omitted.

  First, a branch pipe joint covered with a heat insulator for a branch pipe joint according to an embodiment will be described. 1 and 2 are a perspective view and a side view, respectively, of a branch pipe joint 100 used for refrigerant piping, for example.

  As shown in FIGS. 1 and 2, in the branch pipe joint 100, the flat connecting surfaces 104a, 104b, 104c of the block portion 104 having a substantially triangular prism shape are provided with a pipe-shaped first connecting portion 101 and a second connecting portion. 102 and the third connecting portion 103 are each provided vertically. Inside the block portion 104, a substantially Y-shaped confluence portion G of the flow path communicating with these three connection portions 101, 102, 103 is formed. In addition, each part of the substantially triangular prism of the block part 104 is formed into a round shape. That is, the intersections of the flat surfaces 104a, 104b, 104c, which are the vertices of the triangular prism, are chamfered and rounded.

  The angle θ1 formed by the flat surfaces 104a and 104b of the block portion 104 is 90 degrees, and the angle θ2 formed by the flat surfaces 104b and 104c is 45 degrees. Therefore, the angle between the first connecting portion 101 and the second connecting portion 102 is 90 degrees, and the angle between the second connecting portion 102 and the third connecting portion 103 is 135 degrees, and The angle formed by the third connecting portion 103 and the first connecting portion 101 is 135 degrees.

  In the branch pipe joint 100, the fluid of the refrigerant flowing from the third connecting portion 103 located upstream of the flow passage is connected to the first connecting portion 101 and the second connecting portion 102 located downstream of the flow passage. It is branched in the stretching direction and allowed to flow. That is, the flow of the refrigerant flowing from the third connecting portion 103 changes the traveling direction by 45 degrees from the extending direction of the third connecting portion 103, and the first connecting portion 101 and the second connecting portion 102 respectively. It will flow to. At this time, the smaller the angle changed from the extending direction of the third connecting portion 103, the smaller the loss due to branching, and the easier it is to cover the branch pipe joint 100 with the first heat insulator 20 described later.

  Conventionally, the merging portion G with the first connecting portion 101, the second connecting portion 102, and the third connecting portion 103 in the branch pipe joint 100 has been formed into, for example, a substantially U-shape or a substantially ten-hand shape. . In this case, for example, when the merging portion G is substantially U-shaped (when the first connecting portion 101 and the second connecting portion 102 form a U-shape), the third connecting portion 103 The flow of the refrigerant collided with the U-shaped curved portion and was once blocked. Further, for example, the merging portion G has a substantially cross shape (the second connecting portion 102 and the third connecting portion 103 are linearly arranged, and the first connecting portion 101 is branched therefrom). In this case, the flow of the refrigerant from the third connecting portion 103 was difficult to flow to the first connecting portion 101.

  On the other hand, in the branch pipe joint 100 of this embodiment, the confluence portion G is formed in a Y shape. As a result, the pressure loss in the merging portion G can be reduced, and a suitable flow of the refrigerant can be realized.

  In addition, in the present embodiment, the diameter of the first connecting portion 101 is smaller than the diameters of the second connecting portion 102 and the third connecting portion 103, but the setting is not limited to such a setting. The diameters of the three connecting portions may be the same or may be different from each other. In short, in the present invention, the size of the diameter of each connection portion has nothing to do with the essence of the present invention.

  Although the branch pipe joint 100 can be formed of any material, for example, a material such as aluminum or copper can be used.

  Then, the structure of the heat insulation body for branch pipe joints according to the present embodiment will be described. FIG. 3A is a perspective view of the first heat insulator 20 of the branch pipe joint heat insulator 10 according to the embodiment, and FIG. 3B is a perspective view of the second heat insulator 30. The branch pipe joint heat insulator 10 according to the present embodiment is configured by a combination of a first heat insulator 20 shown in FIG. 3A and a second heat insulator 30 shown in FIG. 3B. .

  As shown in FIG. 3A, the first heat insulator 20 has a tubular shape as a whole, and the material thereof is a resin-based heat insulating material such as foamed rubber or urethane. Further, it has a size that covers the second connecting portion 102, the block portion 104, and the third connecting portion 103. Further, it has an inner diameter that can be inserted so as to cover the second connecting portion 102 and the third connecting portion 103.

  A cut 21 is formed in the first heat insulator 20 from one end 20a along the longitudinal direction. The entire length of the notch 21 is formed from the one end portion 20a over about half of the entire length of the first heat insulating body 20, preferably 1/3 to 2/3. The end portion of the cut 21 opposite to the one end portion 20a is referred to as an end portion 21a.

  As shown in FIG. 3 (b), the second heat insulator 30 has a substantially plate shape in which a through hole 31 for inserting the first connection portion 101 inside is formed, and is made of a resin such as foamed rubber or urethane. It is composed of a heat insulating material.

  The branch pipe joint 100 and the branch pipe joint heat insulator 10 according to the present embodiment are configured as described above, and subsequently, a heat insulating method for insulating the branch pipe joint 100 with the branch pipe joint heat insulator 10 will be described. To do.

  First, as shown in FIG. 4, the third connecting portion 103 of the branch pipe joint 100 is inserted into the one end portion 20a of the first heat insulator 20 where the notch 21 is formed (first procedure).

  Then, as shown in FIG. 5, the first heat insulator 20 is further pushed toward the block portion 104 side as it is, and the first connection portion 101 is inserted inside the notch 21. After that, the first heat insulator 20 is further pushed in so that the one end portion 20a of the first heat insulator 20 reaches near the end portion of the second connection portion 102 (second procedure).

  Then, the first heat insulator 20 is further pushed, and as shown in FIG. 6, the end portion 21a of the notch 21 of the first heat insulator 20 is made to reach the vicinity of the first connection portion 101 to make the second connection. The part 102 and the third connecting part 103 are covered so as to cover them (third procedure). After that, the insides of the cuts 21 of the first heat insulator 20 sandwiching the first connection portion 101 are adhered to each other by, for example, an adhesive (fourth procedure).

  After that, as shown in FIG. 6, the first connecting portion 101 is inserted into the through hole 31 of the second heat insulating body 30 and is put on the block portion 104 (fifth step), and the second connecting portion 101 is inserted. The coating surface of the heat insulator 30 facing the surface of the first heat insulator 20 is bonded to the surface of the first heat insulator 20 with an adhesive or the like (sixth step). As a result, the gap S generated near the first connection portion 101 can be completely covered and closed.

  As described above, the branch pipe joint unit U in which the entire surface of the branch pipe joint 100 is appropriately covered with the heat insulator 10 for the branch pipe joint as shown in FIG. 7 can be manufactured.

  Note that, for example, as shown in FIG. 8, three refrigerant pipes 51 to 53 are connected to the branch pipe joint unit U configured as described above. Normal cylindrical heat insulators 51a to 53a may be provided on the outer circumferences of the refrigerant tubes 51 to 53.

  As shown in FIG. 8, in the heat insulators 51a to 53a, no gap is formed between the heat insulator 51a and the second heat insulator 30 or between the heat insulators 52a and 53a and the first heat insulator 20. It is installed closely. That is, the coated surface of the second heat insulator 30 is adhered to the first heat insulator 20, and the surface of the second heat insulator 30 contacts the heat insulator 51a. Moreover, both ends of the first heat insulator 20 contact the heat insulators 52a and 53a. Thereby, the heat insulation effect of the branch pipe joint 100 can be more appropriately enjoyed.

  In order to more appropriately enjoy the heat insulating effect, a heat insulating tape or the like may be wrapped around the contact portions between the second heat insulating body 30 and the heat insulating body 51a, and the first heat insulating body 20 and the heat insulating bodies 52a and 53a. Good. Accordingly, it is possible to appropriately prevent a gap from being generated between the branch pipe joint heat insulator 10 and the heat insulators 51a to 53a, and it is possible to more appropriately enjoy the heat insulating effect of the branch pipe joint 100. .

According to the heat insulation method of the branch pipe joint 100 described above, a molded product of a heat insulating material, which has been prepared in advance for performing heat insulation treatment on the branch pipe joint as in the related art, is prepared according to the shape of the branch pipe joint. No need. Insulation work at the site is also easy.
More specifically, it is only necessary to prepare the tubular first heat insulator 20 having the notch 21 and the second heat insulator 30 having the through hole 31. In addition, by appropriately selecting a flexible, flexible, and elastic heat insulating material as the material of the first heat insulating body 20 and the second heat insulating body 30, the diameters of the three connecting portions 101, 102, 103 can be reduced. It can be applied as it is without paying much attention to the size and the size of the block portion 104.

  For example, the first heat insulating body 20 having a diameter equal to or larger than the pipe diameter of the third connecting portion upstream of the flow path and the through hole 31 having a hole diameter equal to or larger than the pipe diameter of the first connecting portion to be inserted are provided. If the second heat insulator 30 is prepared, the branch pipe joint 100 can be properly insulated. That is, it is not necessary to prepare a large number of molds for the heat insulating material dedicated to the shape of the branch pipe joint (the combination of the diameters of the connecting portions).

  Further, according to the heat insulating method by the heat insulator 10 for the branch pipe joint according to the present embodiment, the branch pipe joint 100 is inserted so as to cover the first heat insulator 20 and is inserted inside one end of the notch 21. The branch pipe joint unit U covered with the heat insulator can be completed by simply bonding the two together and then inserting and bonding the second heat insulator 30. Therefore, work at the site is extremely easy and does not require skill.

  Furthermore, the notch 21 formed in the first heat insulating body 20 has a total length of about half of the total length of the first heat insulating body 20, preferably one end extending over a length of 1/3 to 2/3. It is formed from 20a. That is, the first heat insulator 20 includes a tubular region having a tubular shape in which the notch 21 is not formed and a notched region in which the notch 21 is formed. In this way, by appropriately setting the length at which the notch 21 is formed, the portion covered by the tubular region of the branch pipe joint 100 (the third connecting portion 103 in the above-described embodiment) can be made more appropriate. It can be insulated. Further, also in the portion of the branch pipe joint 100 covered by the cut area (the second connecting portion 102 in the above-described embodiment), the insides of the cut 21 are adhered to each other to form a substantially tubular shape, and heat is appropriately insulated. be able to.

  In the above description, the third connecting portion 103 was inserted into the first heat insulating body 20 and the second connecting portion 102 and the third connecting portion 103 were installed so as to cover the second connecting portion 102 and the third connecting portion 103. You may make it insert from the connection part 102 side.

  Further, according to the above-described embodiment, in the branch pipe joint heat insulator 10, the second heat insulator 30 is bonded after the first heat insulator 20 is provided. After being inserted into the first connecting portion 101, the first heat insulating body 20 may be covered before and after the procedure. In this case as well, workability and heat insulation similar to those of the above-described embodiment can be obtained.

  The shape of the branch pipe joint 100 covered with the branch pipe joint heat insulator 10 according to the present embodiment is not limited to the above configuration. That is, for example, the angle formed by the first connecting portion 101 and the second connecting portion 102 is not limited to 90 degrees, and may be any angle.

  However, the connection part (the third connection part 103 in the embodiment) that is first inserted into the first heat insulator 20 and the connection part that is inserted and covered last (the second connection part in the embodiment). The angle formed by the second connecting portion 102 and the third connecting portion 103 is an angle formed by the first heat insulating body 20 and the smoothness of covering the two connecting portions with the block portion 104. The angle formed by is 120 degrees to 150 degrees, preferably 135 degrees. That is, the angle θ2 formed by the flat surface 104b and the flat surface 104c is 30 to 60 degrees, preferably 45 degrees or less.

  Further, it is preferable that the flat surface 104a as the surface portion of the block portion 104 to be covered and adhered with the covering surface of the second heat insulator 30 is a flat surface. Thereby, the 2nd heat insulation body 30 can be stuck more stably, and the said clearance gap S which arose in the notch 21 of the 1st heat insulation body 20 can be closed appropriately.

  Still further, in the above embodiment, the block portion 104 of the branch pipe joint 100 has the flat surfaces 104a, 104b, 104c, but the shape has few undulations and corners, and along the flow path of the fluid flowing inside. That is, it is preferable to have a surface having a smooth curved surface. Thereby, the contact area between the inner surface of the branch pipe joint heat insulator 10 and the surface of the branch pipe joint 100 can be increased, and the heat loss from the branch pipe joint 100 can be reduced.

  As shown in FIG. 9A, a notch 21b for locking the first connecting portion 101 may be formed on the end 21a side of the cut 21 of the first heat insulator 20. Good. The diameter of the notch 21b is preferably equal to or smaller than the diameter of the first connecting portion 101 to be inserted. By forming the notch 21b in this way, it is possible to suppress the size of the gap S caused by the insertion of the first connecting portion 101 into the notch 21 or to extend the notch 21 carelessly. Can be prevented.

  Further, as shown in FIG. 9B, the second heat insulator 30 may be provided with a cut 32 reaching the through hole 31. By forming the cut 32 in this manner, the workability of the second heat insulating body 30 to the first connecting portion 101 can be further improved. That is, when the first connecting portion 101 is inserted into the through hole 31 of the second heat insulator 30, the size of the through hole 31 can be expanded, so that the second heat insulator 30 can be more easily opened. Can be installed.

  Furthermore, the shape of the second heat insulator 30 is not limited to the substantially square plate shape as shown in FIGS. 3 and 9, and may have, for example, a substantially rectangular shape. As a result, the bonding may be performed not only along the gap S formed in the first heat insulator 20 but also along the notch 21. Moreover, naturally, it is not limited to the plate shape.

  Further, by forming the cut 32 in the second heat insulating body 30 in this manner, for example, even after the refrigerant pipe 51 is already connected to the first connecting portion 101, the second heat insulating body 30 is formed. The body 30 can be installed.

  The first heat insulator 20 covers the branch pipe joint 100 with a combination of the third connecting portion 103 and the first connecting portion 101 or a combination of the third connecting portion 103 and the second connecting portion 102. It will be. This is because the angle formed between the third connecting portion 103, the first connecting portion 101, and the second connecting portion 102 is gentle (for example, 135 degrees), and the first connecting portion 101 and the second connecting portion 101 are The connection part 102 and the first heat insulator 20 are not covered.

  In this case, the pipe diameter of the third connecting portion 103 is compared with the pipe diameters of the first connecting portion 101 and the second connecting portion 102, and the pipe diameter closer to the pipe diameter of the third connecting portion 103 ( In the above embodiment, it is preferable to cover the second connecting portion 102) with the first heat insulator 20. According to this, the first heat insulating body 20 originally configured as a single tubular body allows two connecting portions (third connecting portion 103 and second connecting portion 102 in this example) having a close pipe diameter to be connected. Since it can be covered, the gap between the inner surface of the first heat insulator 20 and the outer surface of the second connecting portion 102 is reduced, and the branch pipe joint 100 can be insulated more preferably. When the pipe diameter is remarkably smaller than that of the third connecting portion 103 like the first connecting portion 101, the flat surface 104a of the block portion 104 is increased to stabilize the stability of the second heat insulating body 30. It is possible to widen the area where they can be closely adhered. As a result, the branch pipe joint 100 can be suitably insulated as a result.

  Although the embodiment of the present invention has been described above, the present invention is not limited to this example. It is obvious to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims, and of course, the technical scope of the present invention is also applicable to them. Be understood to belong to.

  INDUSTRIAL APPLICABILITY The present invention is useful for insulating a branch pipe joint, and can be easily installed regardless of the combination of the diameters of the connection pipes of the branch pipe joint.

10 Thermal Insulator for Branch Pipe Joint 20 First Thermal Insulator 20a One End 21 Notch 21a End 21b Notch 30 Second Insulator 31 Through Port 32 Notch 100 Branch Pipe Joint 101 First Connection 102 Second Connection Part 103 Third connection part 104 Block part 104a Flat surface 104b Flat surface 104c Flat surface G Merging part S Gap

Claims (7)

A heat insulator covering a branch pipe joint,
The branch pipe joint is
Three connecting parts provided from three different directions respectively,
A block in which a merging portion communicating with each of the three connecting portions is formed,
The heat insulator is
A tubular first heat insulator made of a resin-based heat insulating material;
A second heat insulating body made of a resin-based heat insulating material having a through hole into which the first connecting portion of the three connecting portions can be inserted,
The first heat insulator is
A size that covers the block and the second connection part and the third connection part of the three connection parts,
A heat insulator for a branch pipe joint, wherein a notch corresponding to the first connecting portion is formed from one end of the first heat insulator along the longitudinal direction of the first heat insulator. The length of the notch formed in the first heat insulator is 1/3 to 2/3 of the entire length of the first heat insulator from one end of the first heat insulator. Item 2. A heat insulator for a branch pipe joint according to Item 1. The block of the branch pipe joint further includes a surface portion provided with the first connection portion protruding.
The said 2nd heat insulation body has a coating | coated surface corresponding to the said surface part, The heat insulation body for branch pipe joints as described in any one of Claim 1 or 2 characterized by the above-mentioned. The heat insulation for a branch pipe joint according to any one of claims 1 to 3, wherein an angle formed by the second connecting portion and the third connecting portion in the branch pipe joint is 135 degrees. body. The branch pipe joint heat insulation according to claim 1, wherein a notch corresponding to the first connection portion is formed in a notch in the first heat insulator. body. The branch according to any one of claims 1 to 5, wherein the second heat insulator is formed with a cut reaching from the one end of the second heat insulator to the through hole. Heat insulator for pipe fittings. A heat insulation method for heat insulating a branch pipe joint, comprising: three connecting portions provided respectively from three different directions; and a block having therein a merging portion communicating with each of the three connecting portions.
A first step of inserting a second connecting portion of the three connecting portions into one end of a tubular first heat insulating body made of a resin-based heat insulating material;
The block is arranged so that the first connection part of the three connection parts corresponds to a notch formed from one end part of the first heat insulation part along the longitudinal direction of the first heat insulation part. A second step of coating with a heat insulator of 1;
A third step of covering the third connection part of the three connection parts with the first heat insulator,
A fourth step of adhering the one end portion of the notch shaped to sandwich the first connection portion,
A fifth step of inserting the first connecting portion into the through hole of the second heat insulating body which is a resin-based heat insulating material having a through hole through which the first connecting portion can be inserted,
And a sixth step of adhering the second heat insulator to the first heat insulator.

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