KR20210101127A - Dual pipe structure, support and manufacturing method of dual pipe structure - Google Patents

Abstract

The present invention relates to a dual pipe structure, which can be miniaturized, can reduce costs, and can be easily maintained. The dual pipe structure has inner and outer pipes (43, 44), and forms a first flow path in the inner pipe (43) and a second flow path between the inner and outer pipes (43, 44). The dual pipe structure comprises: a support (55) integrally formed by a resin, and arranged to surround an inner pipe (43) in a second flow path; divisional outer pipes (F1, F2) arranged at upstream and downstream sides of the support (55) in a flow direction of a first fluid to fix the support (55); and a sleeve (56) arranged to surround the support (55) and each of the divisional outer pipes (F1, F2), and bonded by being welded with each of the divisional outer pipes (F1, F2) to seal an inner space (sp) in a radial direction. The support (55) is arranged on the second flow path, such that a cross-sectional area of the second flow path can be reduced.

Description

Double pipe structure, support and method of forming double pipe structure {DUAL PIPE STRUCTURE, SUPPORT AND MANUFACTURING METHOD OF DUAL PIPE STRUCTURE}

The present invention relates to a double tubular structure, a support and a method for forming a double tubular structure.

Conventionally, ships that use liquefied natural gas (LNG) as fuel gas and operate a gas engine are designed based on regulations such as IGC code and IGF code, and the engine room in which the gas engine is accommodated is a gas safety engine area (Gas). safe machinery space), and in consideration of the fuel gas leakage from the engine room, the fuel line, which is a pipe through which the fuel gas flows, and equipment in contact with the fuel gas are surrounded by a separate structure.体) is formed, and the inside of the double tube structure is always ventilated (see, for example, Patent Document 1).

In the double pipe structure, a fuel gas flow path is formed in the inner tube, an annular ventilation air flow path is formed between the inner tube and the outer tube, and the outer tube is supported by the inner tube to keep the cross-sectional area of the air flow passage constant In order to do this, a support is arrange|positioned at the predetermined location in a longitudinal direction.

2 is a perspective view of a support disposed in a conventional double tube structure.

In the drawing, reference numeral 11 denotes a support, and the support 11 is formed by connecting a pair of support pieces 13 and 14 formed by molding a metal plate having elasticity with bolt nuts bt1 and bt2.

The support pieces 13 and 14 include a receiving portion 16 having a semi-cylindrical shape, connecting portions 17 and 18 extending radially outward from both edges of the receiving portion 16, and corresponding connecting portions 17 and 18. A flap (19) extending in a circumferential direction from a radially outer edge of one of the connecting portions (17) is provided.

The receiving portions 16 of the support pieces 13 and 14 are arranged to surround the inner tube (not shown) of the double tube structure, and the connecting portion 17 of the support piece 13 and the connecting portion 18 of the support piece 14 are is connected by a bolt nut bt1, and the support pieces 13 and 14 are fixed by fixing the connecting portion 18 of the support piece 13 and the connecting portion 17 of the support piece 14 with the bolt nut bt2. By connecting the support 11 can be mounted on the inner tube.

In this state, it is possible to assemble a double tube structure by inserting an external appearance (not shown) to the support 11 from the outside to resist the elastic support force of each flap 19 .

In the exterior, the flap 19 elastically supports the exterior by the elastic support force, so that the exterior is supported by the inner tube, thereby maintaining a constant cross-sectional area of the air passage.

Japanese Patent Laid-Open No. 2017-82728

However, in the conventional double pipe structure, since the support 11 is formed by connecting a pair of support pieces 13 and 14 with bolt nuts bt1 and bt2, the double pipe structure is enlarged.

In addition, since the outer appearance is supported by the elastic support force of the flap 19, it is necessary to sufficiently ground the double tube structure so that the inner peripheral surface of the flap 19 and the outer surface are rubbed against the inner peripheral surface of the outer surface by vibration of a ship, etc. cost goes up

In addition, when a double pipe structure is used for a long period of time in a ship or the like, there is a possibility that the support 11 may be corroded by rust or the like, and maintenance and management of the double pipe structure is cumbersome.

The present invention is to solve the problems of the conventional double pipe structure, it can be miniaturized, the cost can be lowered, and also to provide a method of forming a double pipe structure, a support and a double pipe structure that can be easily repaired and managed. The purpose.

To this end, the double tube structure of the present invention has an inner tube and an outer tube, a first flow passage for passing the first fluid is formed in the inner tube, and a second passage for passing the second fluid between the inner tube and the outer tube is formed. made up to be

And a support integrally formed of resin, having an annular shape, arranged to surround the inner tube in the second flow path, and having a communication hole for passing the second fluid therethrough, and the flow direction of the first fluid. It is disposed on the upstream and downstream sides of the support, has a divisional exterior for fixing the support, and a cylindrical shape, is arranged to surround the support and each divisional exterior, and is joined to each divisional exterior by welding to the inside in the radial direction It has a sleeve that seals the space of the

According to the present invention, the double tube structure has an inner tube and an outer tube, a first flow passage for passing the first fluid is formed in the inner tube, and a second passage for passing the second fluid is formed between the inner tube and the outer tube. consist of.

And a support integrally formed of resin, having an annular shape, arranged to surround the inner tube in the second flow path, and having a communication hole for passing the second fluid therethrough, and the flow direction of the first fluid. It is disposed on the upstream and downstream sides of the support, has a divisional exterior for fixing the support, and a cylindrical shape, is arranged to surround the support and each divisional exterior, and is joined to each divisional exterior by welding to the inside in the radial direction It has a sleeve that seals the space of the

In this case, since the support integrally formed of resin and having a communication hole for passing the second fluid through is disposed in the second flow path between the inner tube and the outer tube, the cross-sectional area of the second flow passage can be reduced. Therefore, the double tube structure can be miniaturized.

In addition, since the support is formed of resin, sparks are not generated even when the support and the outer peripheral surface of the inner tube and the inner peripheral surface of the outer tube are rubbed by vibration. Therefore, since the grounding structure of the double pipe structure can be simplified, the cost of the double pipe structure can be reduced.

In addition, even if the double pipe structure is used for a long period of time, the support does not corrode due to rust or the like, so the maintenance and management of the double pipe structure can be simplified.

BRIEF DESCRIPTION OF THE DRAWINGS It is XX sectional drawing of the exterior support part of the double pipe structure in 1st Embodiment of this invention.
2 is a perspective view of a support disposed in a conventional double tube structure.
Fig. 3 is a conceptual diagram of a main part of a ship provided with a double pipe structure according to the first embodiment of the present invention.
Fig. 4 is a perspective view of the double pipe structure according to the first embodiment of the present invention.
It is a perspective view of the support in 1st Embodiment of this invention.
Fig. 6 is a first view for explaining the assembly procedure of the exterior support part in the first embodiment of the present invention.
Fig. 7 is a second view for explaining the assembly procedure of the exterior support part in the first embodiment of the present invention.
Fig. 8 is a third view for explaining the assembly procedure of the exterior support part in the first embodiment of the present invention.
Fig. 9 is a first view for explaining a method of forming a double tubular structure according to the first embodiment of the present invention.
Fig. 10 is a second view for explaining a method of forming a double tubular structure according to the first embodiment of the present invention.
Fig. 11 is a third view for explaining a method for forming a double tubular structure according to the first embodiment of the present invention.
Fig. 12 is a fourth view for explaining a method for forming a double tubular structure according to the first embodiment of the present invention.
Fig. 13 is a fifth view for explaining a method for forming a double tubular structure according to the first embodiment of the present invention.
Fig. 14 is a sixth view for explaining a method for forming a double tubular structure according to the first embodiment of the present invention.
Fig. 15 is a seventh view for explaining a method for forming a double tubular structure according to the first embodiment of the present invention.
Fig. 16 is an eighth view for explaining a method for forming a double tubular structure according to the first embodiment of the present invention.
Fig. 17 is a YY cross-sectional view of the outer appearance support portion of the double tube structure according to the second embodiment of the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described in detail, referring drawings. In this case, a double pipe structure in an engine room in which a gas engine is accommodated and a method for forming the same will be described.

Fig. 3 is a conceptual diagram of a main part of a ship provided with a double pipe structure according to the first embodiment of the present invention.

In the drawing, Aru is a machinery space formed in accordance with the provisions of the IGF code at a predetermined location on the ship, and the machinery space (Aru) is a gas safety machinery space (Ar1) as the first area and ESD (Emergency Shutoff Device) as the second area. It consists of a protective organ area (Ar2). And the gas safety engine area Ar1 is used as an engine room in which the gas engine 22 is disposed. A bunker unit 25 , a tank 26 , a heat exchanger 28 , a blower 31 as a ventilation device, and the like are disposed in the ESD protection engine area Ar2 .

In addition, the air intake 33, the air outlet 34 and the on/off valve 35 are disposed outside the engine area Aru, and the tank 26 and the gas engine 22 are connected inside the engine area Aru. Ventilation lines (L2, L3) connecting the fuel line (L1) and the air inlet (33) and the air outlet (34) are arranged, from the gas safety engine area (Ar1) to the ESD protection engine area (Ar2) A double pipe structure (Pu) is formed by the fuel line (L1) and the ventilation line (L3).

The liquefied natural gas supplied to the ship through the bunker unit 25 from outside the engine area (Aru) is accommodated in the tank 26 and then sent to the heat exchanger 28 in an amount necessary to drive the gas engine 22 and , is heated and vaporized by hot water in the heat exchanger 28, and becomes fuel gas as the first fluid at a predetermined temperature, for example, about 40°C.

The fuel gas flows through the fuel line (L1), which is a pipe for fuel gas, and is sent to the gas engine (22).

However, in the ship, in consideration of when the fuel gas leaks out of the fuel line L1, the inner tube 43 as the first element member formed by the fuel line L1 is used as a separate structure, the outer tube 43 as the second element member ( 44), the double pipe structure (Pu) is formed, and air as the second fluid that has entered from outside the engine area (Aru) is supplied between the inner tube (43) and the outer tube (44) and discharged out of the engine area (Aru). made up to be

To this end, the ventilation line L2 for intake is disposed between the air inlet 33 and the gas engine 22, and the ventilation line for exhaust between the gas engine 22 and the air outlet 34 ( L3) is disposed, and the air from outside the engine area Aru through the air intake 33 flows through the ventilation line L2 and is sent to the gas engine 22, and after being heated in the gas engine 22 , flows between the outer tube 44 and the inner tube 43 formed by the ventilation line (L3) and is sent from the gas safety engine area (Ar1) to the ESD protection engine area (Ar2), and then from the fuel line (L1) It is separated, flows through the ventilation line (L3), is sent to the blower (31), and is discharged out of the engine area (Aru) through the air outlet (34).

Therefore, since negative pressure is formed by the blower 31 in the ventilation lines L2 and L3, even if the fuel gas leaks from the inner tube 43, the fuel gas is sucked by the blower 31 without coming out of the outer tube 44. It is discharged out of the machinery space (Aru).

In addition, in the drawing, the inner tube 43 and the outer tube 44 are shown adjacent to each other for convenience.

Next, the double tube structure (Pu) will be described. In this case, a double pipe structure (Pu) having a flange mounted on one end, extending in a straight line, that is, having a straight portion and a bent portion, that is, a bent portion, and having an “L” shape will be described. do.

Fig. 4 is a perspective view of the double pipe structure according to the first embodiment of the present invention.

In the drawing, Pu is a double tubular structure, Di (i = 1, 2) is a plurality of linear structures arranged in a straight portion of the double tubular structure (Pu), E1 is disposed adjacent to the bent portion of the double tubular structure (Pu) two structural parts, that is, in this embodiment, a curved structural part connected to the straight structural parts D1 and D2, and 51 is a flange as a flange. In the embodiment, it is a flange connecting the straight structural part D1 and other linear structural parts not shown, and Srj (j=1, 2, 3) is an external appearance support part set at a plurality of places in the linear structural part Di. In addition, in the longitudinal direction of the double pipe structure Pu, the side on which the flange 51 is arranged becomes the flange side, and the opposite side becomes the non-flange side.

The double tube structure (Pu) is disposed to surround the inner tube 43 in the inner tube 43, the outer tube 44, and each outer support portion Srj, and the divided outer tube Fk (k = 1, 2, ..., 5) a resin support 55 (FIG. 1) to be described later for supporting and a sleeve 56 surrounding the support 55 in each outer support portion Srj, and has a circular cross-sectional shape in the inner tube 43 A fuel gas flow path Rt1 is formed as a first flow path for passing fuel gas having A flow path Rt2 is formed.

The inner tube 43 is integrally formed by bending it into an "L" shape in the curved structure part E1.

The outer tube 44 includes a plurality of divided outer tubes Fk arranged to surround the inner tube 43 from the flange side to the non-flange side in the straight structure portion Di, and the inner tube 43 in the curved structure portion E1. It includes two elbows Gk (k=1, 2) arranged to surround, and the divisional outer tube Fk is connected by the sleeve 56 in each outer outer support portion Srj.

In addition, the inner tube 43, the outer tube 44, the flange 51, and the sleeve 56 are all formed of a metal and, in this embodiment, stainless steel.

Next, the exterior support part Srj will be described. In this case, since the structure of each exterior support part Srj is the same, the exterior support part Sr1 will be described.

Fig. 1 is a XX cross-sectional view of an external support part of a double tube structure in a first embodiment of the present invention, Fig. 5 is a perspective view of a support in a first embodiment of the present invention, and Fig. 6 is a first embodiment of the present invention. A first drawing for explaining the assembly procedure of the outer appearance support in the first embodiment of the present invention, Figure 7 is a second view for explaining the assembly procedure of the outer appearance support in the first embodiment of the present invention, Figure 8 is a first embodiment of the present invention It is a 3rd drawing for demonstrating the assembly procedure of the exterior support part in a form.

In the drawings, Sr1 is an outer support part, 43 is an inner tube, 44 is an outer tube, Rt1 is a fuel gas flow path, Rt2 is an air flow path, F1 and F2 are a separate exterior, 55 is a support, and 56 is a sleeve. The support 55 is formed by a molding method such as injection molding using a resin, in the present embodiment, a fluororesin, and has an annular shape.

Therefore, since the abrasion resistance, heat resistance and weather resistance are high, even if the double tubular structure (Pu) is used for a long period of time, the support 55 is not deformed and the durability of the support 55 can be improved.

In addition, in the outer support portion (Sr1), the support 55 is surrounded by the sleeve 56, and the inner diameter of the sleeve 56 is divided so that the outer appearance (F1, F2) is supported by the support (55). F2) and the outer diameter of the support 55 is slightly larger.

In addition, the support 55 is an inner annular part 61 as a first annular body, and a second annular body formed at a predetermined distance from the inner annular part 61 in a radial direction outside the inner annular part 61 as a second annular body. A plurality of locations in the circumferential direction of the outer annular portion 62 and the support 55, and in this embodiment four locations, a connection portion 65 for connecting the inner annular portion 61 and the outer annular portion 62 is provided. and "U"-shaped grooves 67 are formed at a plurality of locations on the outer peripheral surface of the outer annular portion 62, and at four locations on the radially outer side of each connecting portion 65 in this embodiment. In addition, the inner diameter of the inner annular portion 61 is slightly larger than the outer diameter of the inner tube 43 so that the support 55 can be slid into the inner tube 43 .

And it has a sector shape between each connection part 65 in the circumferential direction of the support 55, and has a flange side air flow path Rt2 of the support 55 and a non-flange side air flow path Rt2 of the support 55. ) to communicate and a communication hole 71 for passing air is formed.

In addition, the width of the inner annular portion 61 and the connecting portion 65 in the axial direction of the support 55 is larger than the width of the outer annular portion 62, and a predetermined portion of the support 55, in this embodiment, A support portion 73 for supporting the divided outer tubes F1 and F2 at a predetermined position is formed on the outer peripheral surface of the portion protruding from the flange side and the non-flange side of the connection portion 65 . The dimension of the support 55 is set so that the outer circumferential surface of the support 55 is positioned radially outward from the outer circumferential surface of the divisional appearance F1, F2 in a state in which the divisional exteriors F1 and F2 are supported by the support part 73. .

In the sleeve 56, the flange side edge (eg1) is joined to the division exterior (F1) and the non-flange side edge (eg2) is joined to the division exterior surface (F2) by welding, thereby sealing the space (sp) in the radial direction. do it with In addition, the distance (ε) between each edge (eg1, eg2) and the outer annular part 62 of the support 55 is 100 mm or more so that heat by welding is transmitted to the support 55 and the support 55 is not damaged. This applies. In addition, since the support 55 is formed of a fluororesin, heat resistance is high. Therefore, even if the distance (ε) between each edge (eg1, eg2) and the outer annular portion 62 of the support 55 is shortened, the support 55 is not affected by heat, so the structure of the double tube structure (Pu) is simplified. can do.

In the case of assembling the outer support part Sr1, first, as shown in FIG. 6, the division exterior F1, the support 55, and the division exterior F2 are inserted into the inner tube 43 from the outside, at this time on the flange side The support portion 73 is surrounded by the non-flange side edge eg3 of the division exterior F1, and the support portion 73 on the non-flange side is surrounded by the flange side edge eg4 of the division exterior F2, The division exterior (F1, F2) is supported by the support (55).

Subsequently, as shown in FIGS. 7 and 8, the sleeve 56 is fitted to the outside of the support 55 and the divisional exterior (F1, F2), and the edges (eg1, eg2) are welded to the divisional exterior (F1, F2). is fixed by

Next, a method of forming the double tubular structure (Pu) will be described.

Fig. 9 is a first view for explaining a method of forming a double pipe structure in the first embodiment of the present invention, and Fig. 10 is a second view for explaining a method of forming a double pipe structure in the first embodiment of the present invention. Fig. 11 is a third view for explaining a method of forming a double pipe structure in the first embodiment of the present invention, Fig. 12 is a view for explaining a method of forming a double pipe structure in the first embodiment of the present invention Fig. 4 and Fig. 13 are fifth views for explaining the method for forming a double tube structure in the first embodiment of the present invention, and Fig. 14 explains the method for forming a double tube structure according to the first embodiment of the present invention. Fig. 15 is a 7th view for explaining the method of forming a double pipe structure in the first embodiment of the present invention, Fig. 16 is a method of forming a double pipe structure in the first embodiment of the present invention 8 is a diagram for explaining

First, a tube member (not shown) made of stainless steel is cut to a predetermined length and subjected to bending to form an inner tube 43 having straight portions (h1, h2) and bent portions (h3) as shown in FIG. 9 . is formed eg5 is a flange-side edge of the inner tube 43 , and eg6 is a non-flange-side edge of the inner tube 43 .

In addition, as shown in FIGS. 10 and 11 , in the flange side edge eg5 of the inner tube 43, the divided exterior F2, the support 55, the sleeve 56 and the divided exterior F1 are the inner tube 43 outside. The boss portion 51a of the flange 51 is installed inside the inner tube 43 together with the fitting. And the support 55 is fixed by the division exteriors F1 and F2 fitted on the upstream and downstream sides of the support 55 in the flow direction of the fuel gas, and in that state, the sleeve 56 is separated from the division exterior (F1). , F2) by welding, and the flange 51 is joined to the inner tube 43 by welding to form a straight structure portion D1 as shown in FIG.

Subsequently, at the non-flange side edge eg6 of the inner tube 43, the elbows G1 and G2 are installed outside the inner tube 43, the divided outer tube F2 and the elbow G1 are welded, and the elbow G1 and The elbows G2 are welded to each other to form the curved structure E1 as shown in FIG. 13 .

In addition, as shown in Fig. 14, at the non-flange side edge eg6 of the inner tube 43, the divided outer tube F3, the support 55 and the sleeve 56 are fitted outside the inner tube 43, and also in Fig. 15 As shown in the divided exterior (F4), the support (55), the sleeve 56 and the divided exterior (F5) are fitted to the outside of the inner tube (43).

And the elbow (G2) and the division exterior (F3) are joined by welding, and the sleeve 56 is welded to the division exterior (F3, F4) in a state where the support 55 is fixed by the division exterior (F3, F4). In a state in which the support 55 is fixed by the division exteriors F4 and F5 and the sleeve 56 is joined to the division exteriors F4 and F5 by welding, as shown in FIG. 15, a straight structure part (D2) is formed.

In this way, as shown in FIG. 16 , a double tube structure (Pu) including a straight structure part (Di) and a curved structure part (E1) is formed.

In this way, in this embodiment, the support 55 integrally formed of resin and provided with the communication hole 71 for allowing air to pass therethrough is provided in the air flow path Rt2 between the inner tube 43 and the outer tube 43 . Therefore, the cross-sectional area of the air flow path Rt2 can be reduced. Therefore, it is possible to improve the mountability on a ship by miniaturizing the double pipe structure (Pu).

In addition, since the support 55 is formed of resin, sparks are not generated even when the support 55 and the outer peripheral surface of the inner tube 43 and the inner peripheral surface of the outer tube 44 are rubbed by vibration. Therefore, it is possible to simplify the grounding structure of the double pipe structure (Pu), it is possible to lower the cost of the double pipe structure (Pu).

In addition, even when the double pipe structure (Pu) is used for a long period of time, since the support 55 does not corrode due to rust or the like, the maintenance and management of the double pipe structure (Pu) can be simplified.

Next, the second embodiment of the present invention in which the inner tube 43 is provided with a plurality of divided inner tubes similarly to the outer tube 44 will be described. In addition, about what has the same structure as 1st Embodiment, the same code|symbol is attached|subjected, and the effect of the same embodiment is invoked about the effect of invention by having the same structure.

Fig. 17 is a Y-Y cross-sectional view of the outer appearance support portion of the double tube structure according to the second embodiment of the present invention.

In the drawing, Pu is a double tube structure, Sr11 is an outer support part, 43 is an inner tube as a first element member, 44 is an outer tube as a second element member, Rt1 is a fuel gas passage as a first passage, Rt2 is a second is an air flow path as a flow path, Q1 is an inner pipe junction set at a predetermined position of the inner pipe 43, 55 is a pair of supports arranged on the upstream side and downstream side in the flow direction of the fuel gas as the first fluid, 56 is a silver sleeve, and 81 is a stopper as a positioning member for determining the position of the support 55 and disposed so as to surround the inner tube 43 by being adjacent to the support 55 on the inner tube joint Q1 side rather than each support 55 . am. The stopper 81 has an annular shape.

The inner tube 43 is formed by welding the division inner tubes H11 and H12 disposed on the upstream and downstream sides of the inner tube joint Q1 in the flow direction of the fuel gas by welding.

The outer tube 44 has divided outer tubes F11 and F12 disposed on the upstream and downstream sides of the inner tube joint Q1 to surround the inner tube 43 in the straight structure portion Di (FIG. 4).

The support 55 is positioned by the stopper 81 on the inner pipe junction part (Q1) side, and movement to the inner pipe junction part (Q1) side is regulated, and on the opposite side, the division exterior supported by the support part 73 ( It is positioned by F11, F12).

In the sleeve 56, one edge eg1 is joined to the division exterior F11 and the other edge eg2 is welded to the division exterior F12, so that the space (sp11) inside the sleeve 56 in the radial direction. to keep confidential In addition, the distance of the outer annular part 62 as the second annular body of each edge (eg1, eg2) and the support 55 so that the heat by welding is transmitted to the support 55 and the support 55 is not damaged, and The distance between the inner tube joint portion Q1 and the outer annular portion 62 of the support 55 is 100mm or more.

In addition, in the outer support portion Sr11, each support 55 is surrounded by the sleeve 56, and the inner diameter of the sleeve 56 is the inner diameter of the sleeve 56 so that the division exteriors F11 and F12 are supported by each support 55. It becomes slightly larger than the outer diameter of F11, F12) and each support 55. As shown in FIG.

In addition, the inner diameter of the stopper 81 is slightly larger than the outer diameter of the inner tube 43 so that the stopper 81 can be coupled to the inner tube 43 .

The inner tube 43 , the outer tube 44 , the flange 51 , the sleeve 56 , and the stopper 81 are all made of metal and, in this embodiment, stainless steel. The stopper 81 is attached to the inner tube 43 with an adhesive for metal and, in this embodiment, a bond 82 for stainless steel. In addition, the support 55 is integrally formed in an annular shape by a molding method such as injection molding by using a resin or, in the present embodiment, a fluororesin.

In the case of forming the double pipe structure (Pu) shown in FIG. 17, first, the divided inner pipes (H11, H12) are joined by welding at the inner pipe junction part (Q1), and support in the upstream and downstream sides than the inner pipe junction part (Q1) (55) is fitted to the inner tube (43), and each support (55) is positioned by the stopper (81) on the inner tube joining portion (Q1) side rather than each support (55).

Subsequently, on the upstream and downstream sides of each support 55 , each support 55 is positioned by the divisional exteriors F11 and F12 , and the sleeve 56 is connected to each support 55 and each stopper 81 . It is fitted on the outside and joined to each divisional exterior (F11, F12) by welding.

In addition, this invention is not limited to each said embodiment, Various deformation|transformation is possible based on the meaning of this invention, These are not excluded from the scope of the present invention.

43: interior
44: Appearance
55: support
56: sleeve
71: communication hole
F1~F5, F11, F12 : Classification appearance
Pu: double tube structure
Rt1 : fuel gas flow path
Rt2 : air flow path
sp, sp11 : space

Claims (7)

In the double pipe structure having an inner tube and an outer tube, a first flow passage for passing the first fluid is formed in the inner tube, and a second flow passage for passing the second fluid between the inner tube and the outer tube is formed,
(a) a support integrally formed of a resin, having an annular shape, disposed to surround the inner tube in the second flow passage, and having a communication hole for passing a second fluid therethrough;
(b) a divisional appearance that is disposed on the upstream and downstream sides of the support in the flow direction of the first fluid to fix the support;
(c) A double pipe structure, characterized in that it has a sleeve having a tubular shape, arranged to surround the support and each of the divisional exteriors, and joined to each divisional exterior by welding to seal the radially inner space. The method according to claim 1,
A double pipe structure in which the upstream side and the downstream side of the support in the flow direction of the first fluid is supported at a predetermined position by a support formed on the support. The method according to claim 1 or 2,
The support is a double tubular structure formed by a fluororesin. In the double pipe structure having an inner tube and an outer tube, a first flow passage for passing the first fluid is formed in the inner tube, and a second flow passage for passing the second fluid between the inner tube and the outer tube is formed,
(a) a divided inner pipe joined by welding at the inner pipe joint;
(b) a pair of supports arranged to surround the inner tube on the upstream and downstream sides of the inner tube junction in the flow direction of the first fluid;
(c) a positioning member disposed so as to surround the inner tube on the side of the inner tube joining portion rather than each support in the second flow passage, and for determining the position of each support;
(d) a divisional appearance that determines the position of each support on the upstream and downstream sides of each support in the flow direction of the first fluid;
(e) having a tubular shape, arranged to surround each of the supports and each of the divisional exteriors, and having a sleeve for sealing the radially inner space by welding to each divisional exterior;
(f) each support is integrally formed of a resin, has an annular shape, and a double tubular structure, characterized in that a communication hole through which the second fluid passes is formed. The second in the double pipe structure having an inner tube and an outer tube, a first flow passage for passing the first fluid is formed in the inner tube, and a second passage for passing the second fluid between the inner tube and the outer tube In the support disposed in the flow path and integrally formed by resin,
(a) a first annular body;
(b) a second annular body formed at a predetermined distance from the first annular body in a radial direction outside the first annular body;
(c) having a connecting portion for connecting the first and second annular bodies at a plurality of locations in the circumferential direction
(d) A support, characterized in that a support for supporting the external appearance in a predetermined position is formed in a predetermined portion. In the method of forming a double pipe structure having an inner tube and an outer tube, a first flow passage for passing a first fluid is formed in the inner tube, and a second flow passage for passing a second fluid between the inner tube and the outer tube is formed,
(a) a support formed integrally with resin, having an annular shape, and having a communication hole for passing the second fluid through, is sandwiched outside the inner tube,
(b) fixing the support by the divisional appearance arranged on the upstream and downstream sides of the support in the flow direction of the first fluid,
(c) A method of forming a double pipe structure, characterized in that the inner space in the radial direction is airtight by inserting a sleeve having a cylindrical shape on the outside of the support and each divisional exterior, and joining each divisional exterior by welding. In the method of forming a double pipe structure having an inner tube and an outer tube, a first flow passage for passing a first fluid is formed in the inner tube, and a second flow passage for passing a second fluid between the inner tube and the outer tube is formed,
(a) At the inner pipe joint, the divided inner pipe is joined by welding;
(b) sandwiching a pair of supports outside the inner tube at one end and the other end of the inner tube rather than the inner tube joint,
(c) positioning each support by a positioning member on the inner pipe joint side rather than each support in the second flow path;
(d) positioning each support by a divisional appearance on one end side and the other end side of the inner tube rather than each support in the second flow passage,
(e) Inserting a sleeve having a cylindrical shape on the outside of each of the supports and each divisional exterior, and joining to each divisional exterior by welding, the radially inner space is made airtight
(f) Each support is integrally formed by resin, has an annular shape, and a method for forming a double tubular structure, characterized in that a communication hole through which the second fluid passes is formed.

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