WO2011081260A1 - Support unit for connecting thermally insulated double pipes, connector for thermally insulated double pipes having same, and method for connecting thermally insulated double pipes - Google Patents

Abstract

According to the present invention, a support unit for connecting thermally insulated double pipes supports a connection sheet which covers a connection portion of the thermally insulated double pipes, each of which has an inner pipe, an outer pipe covering an outer surface of the inner pipe, and a thermally insulating material interposed between the inner pipe and the outer pipe, wherein said support unit comprises: a support member having a support plate for supporting an end of the connection sheet, and a coupling protrusion protruding from one side of the support plate; a plurality of spacers interposed between the inner pipe and the support member so as to support the support member, and each of which has a contact surface, contacting the outer surface of the inner pipe, and a coupling groove for the coupling protrusion to be inserted therein; and fixing means for fixing the plurality of spacers to a thermally insulated double pipe. The support unit for connecting thermally insulated double pipes according to the present invention occupies less space, thereby enabling the connection portion of the thermally insulated double pipes to be filled with a relatively large amount of thermally insulating materials. Consequently, thermal insulation performance in the connection portion of the thermally insulated double pipes is improved.

Description

A support unit for connecting a double heat pipe and a double heat pipe connector having the same, and a method of connecting a double heat pipe using the same

The present invention relates to a double heat insulation tube, and more particularly, a support unit for connecting a double heat insulation tube for supporting a connection sheet used for connection of a double heat insulation tube and a double heat insulation tube connector having the same and a double heat insulation tube using the same. It relates to the connection method.

In the industrial field, various fluids for various uses are supplied and used, and pipes are used to transfer such fluids.

The type and shape of the pipe varies depending on the purpose, a double inner tube, the outer tube and the tube filled with the insulating material between the inner tube and the outer tube is also used. As described above, the inner tube-insulating material-outer tube is referred to as a multi-pipe or double heat insulating tube (hereinafter referred to as a 'double heat insulating tube' in this specification). The double heat insulation pipe is used as a cooling / heating pipe, a hot spring water pipe, a cryogenic refrigerant pipe, a steam pipe, a fire pipe, or a cryogenic liquid pipe.

The double insulation tube is produced in standardized length, and in practice, the pipe work is performed by connecting the double insulation tube of unit length. Double insulation tubes have difficulty in connecting with each other due to their structural specificity. Representative methods currently used for the connection of the double heat insulation tube include a connection method using a sleeve, a metal case, and a connection method using a heat shrinkable material.

The connection method using a metal case is a method of mechanically connecting a double insulation tube using a sleeve and a joint fastener made of metal. This connection method is not only structurally vulnerable to corrosion but also vulnerable to external shock and vibration.

In the connection method of pipes using heat shrink material, the inner pipe is welded and joined first, and then the surface of the exterior is wrapped with heat shrink material in each pipe, and then the heat shrink material and the adhesive are melted and attached to the surface of the exterior by the torch flame to connect the pipes. to be.

In addition to this connection method, there is a connection method using an electrofusion sheet. In the connection method using the electrofusion sheet, the inner tube is first welded, and the plate-shaped electrofusion sheet containing the heating element is wrapped around the outer circumferential surface of the outer surface, and then the power is supplied to the electrofusion sheet, thereby fusion bonding the electrofusion sheet to the exterior. How to connect the pipes.

In the connection of the double thermal insulation tube using the connection sheet such as the heat shrinkage material or the electrofusion sheet, an empty space surrounded by the connection sheet is formed at the connection portion of the two double insulation tubes connected to each other. Therefore, in the process of wrapping the outer circumferential surfaces of the two exteriors with the connection sheet, the connection sheet may be deformed by applying a load to the joint portion where both ends of the connection sheet are joined.

In order to solve this problem, the method of installing the support structure for supporting the joint part of a connection sheet is used in the connection space provided by the connection sheet. Conventional support structures are arranged in the form of a ring around an inner tube of a double insulation tube to support the connecting sheet.

However, when the double insulation tube is used for the transfer of cryogenic liquids, such as liquefied natural gas, the support structure is in contact with the inner tube, wherein the support structure is cooled and broken under the influence of the cryogenic liquid flowing inside the inner tube to contact, In addition, if the insulation is omitted along the outer circumferential surface of the inner tube and the support structure is installed, the thermal insulation performance is greatly reduced at the connection portion of the double insulation tube, which may greatly reduce the transport efficiency of cryogenic liquid and may cause a safety problem.

The present invention is to solve such a problem, a double heat insulation tube connecting support unit and a double heat insulation tube connector having the same that can stably support the connection sheet without significantly lowering the thermal insulation performance at the connection portion of the double insulation tube and It is an object of the present invention to provide a connection method of the double insulation tube using this.

Supporting device for connecting the double heat insulation tube according to an embodiment of the present invention for achieving the above object, the inner tube, the outer insulation tube surrounding the outside of the inner tube and the double insulation tube including a thermal insulation material interposed between the inner tube and the appearance To support the connection sheet surrounding the connection portion of the support plate, a support member having a support plate for supporting the end of the connection sheet and a coupling protrusion provided to protrude on one surface of the support plate, and the inner tube to support the support member A plurality of spacers disposed between the supporting members and in contact with an outer circumferential surface of the inner tube and a coupling groove into which the coupling protrusion may be inserted, and fixing means for fixing the plurality of spacers to the double insulation tube. .

The spacer may be provided in the coupling hole, and the fixing means may include a fixing pin inserted through the coupling hole and inserted into the insulating material to fix the spacer to the insulating material.

The coupling protrusion may be provided in a shape extending in the longitudinal direction of the double insulation tube to be parallel to the support plate, the coupling groove may be provided in a shape extending in the longitudinal direction of the double insulation tube.

The support plate is provided with a plurality of insertion holes, the spacer is provided with an insertion groove corresponding to the insertion hole, the support unit for connecting the double heat insulation tube according to an embodiment of the present invention penetrates the insertion hole and the insertion It may further include a coupling pin inserted into the groove.

The spacer may be made of the same material as the heat insulating material.

The insulation and the spacer may be made of polyurethane foam.

Double insulation tube connecting member according to an embodiment of the present invention for achieving the above object, the inner tube and the outer wrap around the inner tube and the inner tube and the insulating material interposed between the outer end and each end of each other A plurality of double insulation pipes connected, the connection sheet surrounding the connection portion of the double insulation pipes, a support plate for supporting the end of the connection sheet and a support member having a coupling protrusion provided to protrude on one surface of the support plate, the support member A plurality of spacers disposed between the inner tube and the support member and having a contact surface in contact with an outer circumferential surface of the inner tube and a coupling groove into which the coupling protrusion may be inserted, and fixing the plurality of spacers to the double insulation tube to support the It includes a fixing means for.

The double insulation tube connector according to an embodiment of the present invention is provided on the connection sheet for the injection of the insulating material and the insulating material filled in the connection space provided in the connection portion of the double insulation tube by the connection sheet. It may further include a stopper for blocking the through hole to be.

The stopper may include a fusion member fused to an outer surface of the connection sheet to cover the through hole, and a conductor disposed between the connection sheet and the fusion member.

Connection method of a double thermal insulation tube according to an embodiment of the present invention for achieving the above object, a) an inner tube, the outer wrap around the outer tube and the inner tube and the insulation interposed between the outer tube, the Preparing a plurality of double insulation tube exposed to the outer peripheral surface of both ends of the inner tube to the outside, b) Arranging the double insulation tube in the connection position, c) Bonding the end of each inner tube of the double insulation tube And d) a support member having a support plate and a coupling member provided to protrude on one surface of the support plate, a contact surface in contact with an outer circumferential surface of the inner tube, and a plurality of spacers having coupling grooves into which the coupling protrusion can be inserted. Preparing a unit, e) coupling the support unit to the connection site of the double thermal insulation tubes, f) covering the connection site of the dual thermal insulation tubes Coupling a connection sheet to an outer circumferential surface of a depressed appearance, and positioning two ends of the connection sheet on the support plate, g) forming a through hole in the connection sheet, h) forming a through hole through the through hole; Injecting a foamed thermal insulation material into the connection space provided between the connection sheets; i) expanding the foamed thermal insulation material injected into the connection space.

The step e) may include inserting a fixing pin into the insulation through the through hole by providing a through hole in the spacer.

According to an embodiment of the present invention, a method of connecting a double insulation tube includes a body part having an outer diameter corresponding to the diameter of the through hole after the h), and having an outer diameter greater than the diameter of the through hole. The method may further include coupling a plug having a head portion provided at one end, a connection hole provided inside the connection sheet, and an exhaust hole or an exhaust groove to communicate an external space with the through hole.

The connection method of the double heat insulation tube according to an embodiment of the present invention may further include removing the plug and closing the through hole with a stopper after the expansion of the expandable thermal insulation material is completed.

The blocking of the through hole with the stopper may include preparing a fusion member and a conductor having a width wider than that of the through hole, wherein the through hole is covered by the fusion member, wherein the through hole is disposed between the connection sheet and the fusion member. And disposing the fusion member and the conductor on the connection sheet such that a conductor is interposed, and applying the high frequency to the conductor to fusion weld the fusion member to the connection sheet.

The fusion member may be made of the same material as the connection sheet.

The support unit for connecting the double heat insulation tube according to the present invention can fill a relatively large amount of heat insulating material in the connection space provided at the connection portion of the double heat insulation tube because the space required for installation is small. Therefore, the heat insulation performance of the connection part of a double heat insulation tube can be improved, and cryogenic liquid can be conveyed stably. Furthermore, by making some components of the support unit for connecting the double insulation tube made of a heat insulating material such as polyurethane foam having excellent insulation performance, it is possible to further improve the insulation performance of the connection portion of the double insulation tube.

In addition, the support unit for connecting the double heat insulation tube according to the present invention can be easily installed to shorten the connection time of the double heat insulation tube.

Figure 1 shows a part of the double thermal insulation tube connecting support unit and a double insulation tube according to an embodiment of the present invention.

Figure 2 shows that the inner tube of the two double insulation tube is combined.

Figure 3 shows a method of coupling the spacer of the support unit for connecting the double heat insulation tube according to an embodiment of the present invention to the double heat insulation tube.

Figure 4 shows a method of coupling the support member of the support unit for connecting the double heat insulation tube according to an embodiment of the present invention to the spacer.

Figure 5 shows the coupling of the connection sheet to the double insulation tube by using a support unit for connecting the double insulation tube according to an embodiment of the present invention.

6 shows that through holes are provided in the connecting sheet.

Figure 7 shows the injection of the foamed thermal insulation material in the connection space provided between the two double insulation tube through the through hole of the connection sheet.

8 shows the plug coupled to the through hole of the connecting sheet.

9 is for explaining the operation of the plug shown in FIG.

10 shows a method of closing the through hole of the connecting sheet with a stopper.

FIG. 11 shows the stopper shown in FIG. 10.

12 shows that the through hole of the connecting sheet is plugged.

13 to 15 show another embodiment of a stopper.

Figure 16 shows another embodiment of a stopper.

<Description of Symbols for Major Parts of Drawings>

10: double heat insulation tube 11: inner tube

12: appearance 13: insulation

15: connection space 20: connection sheet

21 through hole 30 support unit

31 support member 32 support plate

33: engaging protrusion 35: spacer

36: contact surface 37: coupling groove

40: fixed pin 45: coupling pin

50: foaming thermal insulation material 60: plug

70, 80, 95: stopper 71, 81: fusion member

74, 90, 95: conductor 78: high frequency welding machine

Hereinafter, with reference to the accompanying drawings, it will be described in detail with respect to the support unit for connecting the double heat insulation tube according to an embodiment of the present invention, the double heat insulation tube connector having the same, and the connection method of the double heat insulation tube using the same.

In describing the present invention, the size or shape of the components shown in the drawings may be exaggerated or simplified for clarity and convenience of description. In addition, terms that are specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user or operator. These terms should be interpreted as meanings and concepts corresponding to the technical spirit of the present invention based on the contents throughout the specification.

Figure 1 shows a part of the double thermal insulation tube connecting support unit and a double insulation tube according to an embodiment of the present invention.

As shown in FIG. 1, the support unit 30 for connecting a double heat insulation tube according to an embodiment of the present invention is for supporting a connection sheet 20 for connecting two double heat insulation tubes 10. Here, the double heat insulating tube 10 includes an inner tube 11, an outer tube 12 enclosing the inner tube 11, and an insulating material 13 interposed between the inner tube 11 and the outer tube 12. Various metal tubes or plastic tubes may be used as the inner tube 11, and plastic tubes may be used as the exterior 12, and polyurethane foam, silica, pearlite, glass wool, rock wool, etc. may be used as the heat insulating material 13. Can be.

The connection sheet 20 is for wrapping a portion where the ends of the inner tubes 11 of the double insulation tubes 10 are bonded to each other, and is bonded to each exterior 12 of the double insulation tubes 10. The connecting sheet 20 is dried to cover the outer circumferential surface of the exterior 12 and then both ends are joined to surround the connecting portion of the two double thermal insulation tubes 10. As the connection sheet 20, a heat shrink sheet, an electrofusion sheet, a tubular body, or the like, which is well known, may be used. The connection part space 15 is provided between the inner pipe | tube 11 and the connection sheet | seat 20 by the connection sheet | seat 20 surrounding the periphery of each exterior 12. As shown in FIG.

As shown in FIG. 1, the support unit 30 includes a support member 31, a plurality of spacers 35, a plurality of fixing pins 40, and a plurality of coupling pins 45. The support member 31 includes a support plate 32 for supporting the end of the connection sheet 20 and a pair of coupling protrusions 33 provided to protrude on one surface of the support plate 32. The support plate 32 is provided with an insertion hole 34 for engaging the coupling pin 45. Although the support plate 32 is illustrated as being formed in a flat plate shape extending in the longitudinal direction of the double heat insulating tube 10, the support plate 32 may be formed in a curved shape corresponding to the curvature of the exterior 12.

The length of the support plate 32 may be appropriately determined to be the length of the inner tube 11 exposed to the outside plus the length of the inner tube 11 or shorter. The pair of coupling protrusions 33 is formed in a shape extending in the longitudinal direction of the double heat insulating tube 10 to be parallel to the support plate 32. The length of the coupling protrusion 33 may be appropriately determined to be the same as or shorter than the support plate 32. The support member 31 may be made of various materials that can prevent heat release of the fluid flowing along the inner tube 11 because the heat transfer coefficient such as plastic is small.

The spacer 35 is for supporting the support member 31 and is disposed between the inner tube 11 and the support member 31 and has a contact surface 36 in contact with the outer circumferential surface of the inner tube 11. The contact surface 36 is formed of a curved surface having a curvature corresponding to the curvature of the outer circumferential surface of the inner tube 11 so as to be stably in close contact with the outer circumferential surface of the inner tube 11.

The spacer 35 has a coupling groove 37 into which the coupling protrusion 33 can be inserted, a coupling hole 38 into which the fixing pin 40 can be inserted, and an insertion groove into which the coupling pin 45 can be inserted. 39). Coupling groove 37 is made of a shape extending in the longitudinal direction of the double insulation tube 10, a pair is provided in parallel to each other. As the coupling groove 37 is formed in a shape extending in the longitudinal direction of the double heat insulating tube 10 like the coupling protrusion 33, the coupling protrusion 33 is formed even though the amount of heat shrinkage of the support member 31 and the spacer 35 is different. ) May remain coupled to the coupling groove 37.

The depth of the coupling groove 37 is equal to or deeper than the height of the coupling protrusion 33. The coupling hole 38 extends in the longitudinal direction of the double insulation tube 10 to pass through the spacer 35. The insertion groove 39 is provided on a surface on which the coupling groove 37 of the spacer 35 is formed.

The spacer 35 is coupled to the double insulation tube 10 by the fixing pin 40. The fixing pin 40 penetrates through the coupling hole 38 of the spacer 35 and is inserted into the heat insulating material 13 of the double heat insulating tube 10 to support the spacer 35. After the coupling protrusion 33 of the support member 31 is inserted into the coupling groove 37 of the spacer 35, the coupling pin 45 passes through the insertion hole 34 of the support member 31 so that the spacer ( By being inserted into the insertion groove 39 of the 35, the support member 31 can be stably coupled to the spacer 35. Here, the fixing pin 40 or the coupling pin 45 may be made of various materials having a low heat transfer coefficient such as plastic.

The spacer 35 is made of various heat insulating materials having a low heat transfer coefficient. Preferably, the material of the spacer 35 is made of the same material as the material of the insulating material (13). For example, when the heat insulating material 13 is made of polyurethane foam, the spacer 35 may also be made of polyurethane foam.

In the present invention, the coupling protrusion 33 of the support member 31 may be formed in various shapes in addition to those shown, and the coupling groove 37 of the spacer 35 into which the coupling protrusion 33 is inserted is also a coupling protrusion ( 33) It may be changed into various shapes according to the shape. In addition, the fixing pin 40 for fixing the support member 31 to the spacer 35 may be changed to a variety of fixing means.

Hereinafter, with reference to the accompanying drawings will be described a method of connecting a double heat insulation tube using a support unit for connecting a double heat insulation tube according to an embodiment of the present invention.

First, as shown in Figure 2, to prepare a double heat insulating tube 10 including the inner tube 11, the outer surface 12 and the heat insulating material 13, the double heat insulating tube 10 to be connected to each other in the connection position Sort it. At this time, the inner tube 11 and the outer tube 12 of the two double thermal insulation tube 10 are positioned in a straight line. Thereafter, the two inner pipes 11 are combined in an appropriate manner according to the material of the inner pipe 11. For example, when the inner tube 11 is made of a metal material, the two inner tubes 11 may be coupled by butt welding.

Next, as shown in Figure 3 and 4, the inner tube 11 is coupled to the support unit 30 to the two double thermal insulation tube 10 bonded to each other. A specific method of coupling the support unit 30 is as follows. First, as shown in FIG. 3, by using a plurality of fixing pins 40, the pair of spacers 35 are respectively coupled to the double insulation tube 10, and as shown in FIG. 4, the support member ( The coupling protrusion 33 of the 31 is inserted into the coupling groove 37 of the spacer 35 to couple the support member 31 to the spacer 35, and then the support member 31 is coupled to the spacer 35 by the coupling pin 45. Secure in.

Next, as shown in FIG. 5, the connecting sheet 20 is wound around the two exteriors 12 to cover the connecting portions of the two double thermal insulation tubes 10. At this time, the connecting sheet 20 is to surround the outer surface 12, but the portion where the two ends of the connecting sheet 20 is to be positioned on the support plate 32 of the support member 31.

As the connecting sheet 20, various types of connecting the two exteriors 12, such as a heat shrinkable sheet or an electrofusion sheet, which may be fused to each exterior 12 by heating, may be used. When joining the connecting sheet 20, the support unit 30 serves to withstand the load applied to the portion where the two ends of the connecting sheet 20 meet, so that even if a load is applied to the end of the connecting sheet 20 Deformation of the connecting sheet 20 does not occur such that the sheet 20 is recessed toward the inner tube 11. Thus, the connecting sheet 20 can be stably and firmly bonded to the exterior 12.

Next, as shown in FIG. 6 and FIG. 7, a through hole 21 is formed in one side of the connecting sheet 20, and a connecting portion space provided inside the connecting sheet 20 through the through hole 21. Insulating the foamable thermal insulation material (50). As the foaming insulating material 50, various types of foaming resins may be used in the form of a foam such as polyurethane foam, which can expand in volume. 6 and 7 show the appearance 12, the heat insulating material 13 and the connection sheet 20 in a cut, the fixing pin 40 is omitted.

After injecting a predetermined amount of the foamed thermal insulation material 50 in the connection space 15, the plug 60 is coupled to the through hole 21, as shown in FIG. Here, the plug 60 is coupled to the through hole 21 after the injection of the expandable insulating material 50, thereby preventing the expandable insulating material 50 from blocking the through hole 21 and air in the connection space 15. Serves to discharge.

As shown in FIG. 1, the plug 60 includes a head portion 61, a body portion 62, and an outer diameter reduction portion 63. The body portion 62 has a cylindrical shape with a constant outer diameter. The head portion 61 is provided to have an outer diameter larger than the outer diameter of the body portion 62 at one end of the body portion 62. The outer diameter reducing portion 63 extends from the other end of the body portion 62 and is formed in a shape in which the size of the outer diameter gradually decreases away from the body portion 62. In order that the plug 60 is not completely inserted into the through hole 21 of the connecting sheet 20 and is not easily separated from the through hole 21, the body portion 62 has an outer diameter of the diameter of the through hole 21. It has a corresponding size, and the head portion 61 has a size whose outer diameter is larger than the diameter of the through hole 21.

A plurality of exhaust holes 64 are formed inside the plug 60, and a plurality of exhaust grooves 65 are provided on the outer circumferential surface of the plug 60. These exhaust holes 64 and exhaust grooves 65 are for discharging air in the connection space 15 provided inside the connection sheet 20. The exhaust hole 64 is provided to extend from the head portion 61 to the outer diameter reduction portion 63, and the exhaust groove 65 is provided to extend from the head portion 61 to a portion of the outer diameter reduction portion 63.

As shown in FIG. 8 and FIG. 9, when the plug 60 is inserted into the through hole 21, the connection space 15 and the external space are divided into a plurality of exhaust holes 64 and a plurality of exhaust holes provided in the plug 60. It is connected via the exhaust groove 65. Thus, when the expandable insulating material 50 expands, air in the connection space 15 can be discharged to the outside through these exhaust holes 64 and the exhaust grooves 65.

In addition, the plug 60 serves to prevent the expandable thermal insulation material 50 from blocking the through hole 21. That is, as shown in FIG. 9, the lower end of the plug 60 protruding toward the inside of the connection space 15 is in contact with the expandable insulating material 50 that is expanded and diffuses toward the through hole 21. Prevents 50 from accessing the through hole 21. Therefore, the air in the connection space 15 may be discharged to the outside through the exhaust hole 64 or the exhaust groove 65 until the foamed insulating material 50 completely covers the circumference of the plug 60. In this way, the air in the connection space 15 is discharged to the outside until the expandable thermal insulation material 50 completely covers the circumference of the plug 60, so that the expandable thermal insulation material 50 is uniformly filled in the connection space 15. Can be.

A locking projection 66 is provided between the body portion 62 and the outer diameter reducing portion 63 of the plug 60. The locking projection 66 serves to prevent the plug 60 inserted into the through hole 21 of the connection sheet 20 from being easily separated from the through hole 21. When the expandable thermal insulation material 50 of the connection space 15 expands, the plug 60 inserted into the through hole 21 is pressed outward. At this time, since the locking projection 66 is caught by the edge of the through hole 21, the plug 60 is not easily separated from the through hole 21. The engaging projection 66 has an inclined surface 67 and can be easily inserted into the through hole 21. The length in which the locking projections 66 protrude from the outer circumferential surface of the body portion 62 is smaller than the length of the head portion 61 protruding from the outer circumferential surface of the body portion 62.

Subsequently, when the diffusion of the thermal insulating material 50 is completed and the connection space 15 is completely filled with the foam thermal insulating material 50, the plug 60 is removed from the through hole 21 as shown in FIG. 10. After separation, the through hole 21 is plugged with a stopper 70 to complete the double heat pipe assembly to which the double heat pipes 10 are connected.

Here, the stopper 70, as shown in Figure 10 and 11, is a high frequency fusion to the connection sheet 20, the fusion member 71 and the connection sheet 20 and the fusion sheet 20 fused to the connection sheet 20 and The conductor 74 is disposed between the fusion member 71. The fusion member 71 has a cover portion 72 which can completely cover the through hole 21 and an insertion protrusion 73 which is provided to protrude on one surface of the cover portion 72 so that it can be inserted into the through hole 21. Include.

The insertion protrusion 73 has a shape and a size corresponding to the through hole 21 to block the through hole 21. The fusion member 31 may be made of the same material as the connection sheet 20 or various synthetic resin materials to be fused to the connection sheet 20.

The conductor 74 has a ring shape in which an insertion hole 75 is provided at the center thereof so that the insertion protrusion 73 can pass therethrough. A plurality of passage holes 76 are provided around the insertion hole 75 of the conductor 74. When the fusion member 71 is partially melted by the action of the high frequency fusion machine 78, the molten melt of the fusion member 71 passes through the plurality of through holes 76, thereby making the fusion member 71 more quickly and firmly. Can be bonded.

The stopper 70 may be fused to the connection sheet 20 using the high frequency fusion machine 78. After the fusion member 71 and the conductor 74 are placed on the connection sheet 20 and the high frequency fusion machine 78 is operated, as shown in FIG. 12, the fusion member 71 and the hook are connected by the conductor 74. As the sheet 20 is partially melted and fused, the through hole 21 is blocked.

13 to 15 show another embodiment of a stopper.

The stopper 80 illustrated in FIGS. 13 to 15 includes a fusion member 81 fused to the connection sheet 20 and a conductor 90 disposed between the connection sheet 20 and the fusion member 81. The fusion member 81 includes a cover portion 82 that can completely cover the through hole 21, and an insertion protrusion 83 that protrudes from one surface of the cover portion 82 so that the welding member 81 can be inserted into the through hole 21. Include.

An installation groove 84 in which the conductor 90 is inserted is provided around the insertion protrusion 83 of the cover portion 82, and an accommodation groove 85 is formed around the installation groove 84. The receiving groove 85 is for accommodating the molten melt of the fusion member 81 when the fusion member 81 is melted by the action of the conductor 90 by high frequency. When the fusion member 81 is fused to the connecting sheet 20, the melt of the fusion member 81 is accommodated in the receiving groove 85, so that the molten portion inside the fusion member 81 is outside of the fusion member 81. To prevent leakage to the side.

As shown in FIGS. 14 and 15, a plurality of indicating grooves 86 are provided on the other surface of the fusion member 81. An indicator protrusion 87 is provided inside the indicator groove 86. When arranging the fusion member 81 and the conductor 90 to the connecting sheet 20 and applying a high frequency with the high frequency fusion machine 78, the inner part of the fusion member 81 is melted, so that the operator It is not easy to see if it melts. The indication groove 86 and the indication protrusion 87 are for allowing the user to check a state in which the fusion member 81 is melted. That is, when the fusion member 81 is melted, the shape of the instruction groove 86 or the angle of the indication protrusion 87 or the protrusion height change occurs, so that the operator can confirm that the fusion member 81 is melted through this.

As shown in Figure 13 and 15, the installation groove 84 is provided with a plurality of fixing projections (88). The plurality of fixing protrusions 88 are for fixing the conductor 90 to the installation groove 84. When the conductor 90 is inserted into the installation groove 84, the insertion protrusion 83 of the fusion member 81 is inserted into the insertion hole 91, and the plurality of fixing protrusions 88 are formed in the plurality of the conductors 90. The conductor 90 is fixed to the fusion member 81 by being coupled to the through hole 92.

In addition, the installation groove 84 is not formed, the fixing protrusion 88 may be formed directly on the fusion member (81). In this case, the plurality of fixing protrusions 88 are directly coupled to the passage hole 92 of the conductor 90 so that the conductor 90 is fixed to the fusion member 81.

Figure 16 shows another embodiment of a stopper.

The stopper 95 shown in FIG. 16 has the same configuration as that of the stopper 80 shown in FIGS. 13 to 15, but differs only in the structure of the conductor 96. The conductor 96 has a ring shape having an insertion hole 97 into which the insertion protrusion 83 of the fusion member 81 can be inserted. The circumference of the insertion hole 97 is provided with a plurality of passage grooves 98 through which the melt of the fusion member 81 can flow. The passage groove 98 has a shape opened from the circumference of the conductor 95.

When the conductor 96 is coupled to the installation groove 84 or the fusion member 81 of the fusion member 81, a plurality of fixing projections 88 are inserted into the some passage grooves 98 to the fusion member 81. Combined. In order to more tightly couple the conductor 96 to the fusion member 81, the fixing protrusion 88 inserted into the passage groove 98 may be pressed by applying heat and pressure.

In the present invention, the stoppers 70, 80 and 95 may be modified to other structures that can block the through holes 21 in addition to those shown. As a material of the stoppers 70, 80 and 95, those having a low heat transfer coefficient such as plastic may be used.

As such, since the support unit 30 for connecting the double insulation tube according to the embodiment of the present invention has a small space for installation, more insulation is maintained in the connection space 15 of the two insulation insulation tubes 10 connected to each other. The material can be filled. Therefore, it is possible to solve the problem that the thermal insulation performance is deteriorated at the connection portion of the double insulation tube 10, and to ensure that the cryogenic liquid such as liquefied natural gas can be stably transferred.

The embodiments of the present invention described above and illustrated in the drawings should not be construed as limiting the technical idea of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the protection scope of the present invention as long as it will be apparent to those skilled in the art.

Claims (19)

In the inner tube, the outer wrapper of the inner tube and the double heat insulating tube connecting support unit for supporting the connection sheet surrounding the connection portion of the double insulation tube including the insulation between the inner tube and the outer tube, A support member having a support plate for supporting the end of the connection sheet and a coupling protrusion provided to protrude on one surface of the support plate; A plurality of spacers disposed between the inner tube and the supporting member to support the support member, the spacer having a contact surface contacting the outer circumferential surface of the inner tube and a coupling groove into which the coupling protrusion can be inserted; And And a fixing means for fixing the plurality of spacers to the double heat insulating tube. The method of claim 1, The spacer is provided in the coupling hole, The fixing means is a double heat insulation tube connecting support unit characterized in that it comprises a fixing pin which is inserted into the insulating material through the coupling hole to fix the spacer to the insulating material. The method of claim 1, The coupling protrusion is provided in a shape extending in the longitudinal direction of the double insulation tube so as to be parallel to the support plate, the coupling groove is provided in a shape extending in the longitudinal direction of the double insulation tube Support unit. The method of claim 1, The support plate is provided with a plurality of insertion holes, The spacer is provided with an insertion groove corresponding to the insertion hole, And a coupling pin inserted into the insertion groove through the insertion hole. The method of claim 1, The spacer is a double heat insulation tube connecting unit, characterized in that made of the same material as the insulation. The method of claim 5, The insulating member and the spacer support unit for connecting a double heat insulation tube, characterized in that made of polyurethane foam. A plurality of double thermal insulation tubes including an inner tube, an outer wrapper of the outer tube, and a thermal insulating material interposed between the inner tube and the outer tube, each end of which is connected to each other; A connection sheet surrounding the connection portion of the double insulation tubes; A support member having a support plate for supporting the end of the connection sheet and a coupling protrusion provided to protrude on one surface of the support plate; A plurality of spacers disposed between the inner tube and the supporting member to support the support member, the spacer having a contact surface contacting the outer circumferential surface of the inner tube and a coupling groove into which the coupling protrusion can be inserted; And And a fixing means for fixing the plurality of spacers to the double heat insulating tube. The method of claim 7, wherein The spacer is provided in the coupling hole, The fixing means is connected to the double insulation tube characterized in that it comprises a fixing pin which is inserted into the insulation through the coupling hole to fix the spacer to the insulation. The method of claim 7, wherein A heat insulating material filled in the connection part space provided at the connection portion of the double heat insulating tubes by the connection sheet; And And a stopper for blocking a through hole provided in the connection sheet for injecting the insulating material. The method of claim 9, And the plug includes a fusion member fused to an outer surface of the connection sheet so as to cover the through hole, and a conductor disposed between the connection sheet and the fusion member. a) an inner tube, an outer tube surrounding the outside of the inner tube, and an insulating tube interposed between the inner tube and the outer surface, the steps of preparing a plurality of double insulation tube exposed to the outside of the outer peripheral surface of both ends of the inner tube; b) aligning said dual thermal insulation tubes in a connection position; c) bonding the ends of the respective inner tubes of the double insulation tubes to each other; d) preparing a support unit having a support plate and a support member having a coupling protrusion provided on one surface of the support plate, a contact surface in contact with an outer circumferential surface of the inner tube, and a plurality of spacers having a coupling groove into which the coupling protrusion can be inserted. Making; e) coupling the support unit to the connection site of the double insulation tubes; f) coupling a connection sheet to an outer circumferential surface of each exterior to cover the connection portion of the double heat insulating tubes, placing two ends of the connection sheet on the support plate; g) forming a through hole in the connecting sheet; h) injecting an insulating foam material into the space of the connection portion provided between the inner tube and the connection sheet through the through hole; And i) expanding the expandable thermal insulation material injected into the connection space; The method of claim 11, Wherein e), the step of providing a through-hole in the spacer comprising the step of inserting the fixing pin into the heat insulating material through the through-hole. The method of claim 11, The coupling projection is provided in a shape extending in the longitudinal direction of the double insulation tube, the coupling groove is connected to the double insulation tube, characterized in that it is provided in a shape extending in the longitudinal direction of the double insulation tube. The method of claim 11, The spacer is connected to the double insulation tube, characterized in that made of the same material as the insulation. The method of claim 14, The insulation and the spacer is connected to the double insulation tube, characterized in that made of polyurethane foam. The method of claim 11, After the step h), a body portion having an outer diameter corresponding to the diameter of the through hole, a head portion provided at one end of the body portion having an outer diameter larger than the diameter of the through hole, a connecting portion provided in the connection sheet And coupling a plug having an exhaust hole or an exhaust groove capable of communicating a space with an external space, to the through hole. The method of claim 16, After the expansion of the expandable thermal insulation material is completed, Disconnecting the plug and plugging the through-hole with a stopper. The method of claim 17, Blocking the through hole with the stopper, Preparing a fusion member and a conductor having a wider area than the through hole; Disposing the fusion member and the conductor on the connection sheet such that the through hole is covered by the fusion member but the conductor is interposed between the connection sheet and the fusion member; And connecting the fusion member to the connection sheet by applying a high frequency to the conductor. The method of claim 17, The fusion member is connected to the double insulation tube, characterized in that made of the same material as the connection sheet.

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