JP6999729B2 - Double tube structure and support - Google Patents

Description

The present invention relates to a double tube structure and a support.

Conventionally, vessels that use liquefied natural gas (LNG) as fuel gas and drive a gas engine to operate are designed based on the regulations of IGC code, IGF code, etc., and the engine room where the gas engine is housed according to the regulations. Is made into a gas safe machinery space. Then, in the ship, in consideration of the case where the fuel gas leaks in the engine room, the fuel line, which is the pipe through which the fuel gas flows, the equipment in contact with the fuel gas, and the like are surrounded by another structure. A heavy pipe structure is formed so that the inside of the double pipe structure is constantly ventilated (see, for example, Patent Document 1).

In the double pipe structure, a fuel gas flow path is formed in the inner pipe, an annular ventilation air flow path is formed between the inner pipe and the outer pipe, and the outer pipe is supported by the inner pipe. Supports for keeping the cross-sectional area of the air flow path constant are arranged at predetermined locations in the longitudinal direction.

FIG. 2 is a perspective view of a support arranged in a conventional double pipe structure.

In the figure, reference numeral 11 is a support, and the support 11 is formed by connecting a pair of holding pieces 13 and 14 formed by molding an elastic metal plate with bolts and nuts bt1 and bt2.

The holding pieces 13 and 14 are one of 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 connecting portions 17 and 18. A flap 19 extending circumferentially from the radial outer edge of the connecting portion 17 is provided.

Each receiving portion 16 of the holding pieces 13 and 14 is arranged so as to surround an inner pipe (not shown) of the double pipe structure, and the connecting portion 17 of the holding piece 13 and the connecting portion 18 of the holding piece 14 are bolted. -The holding pieces 13 and 14 are connected by connecting with the nut bt1 and the connecting part 18 of the holding piece 13 and the connecting part 17 of the holding piece 14 are fixed by the bolt nut bt2, and the support 11 is attached to the inner pipe. be able to.

In this state, the double tube structure can be assembled by externally fitting an outer tube (not shown) to the support 11 against the urging force of each flap 19.

In the outer pipe, the flap 19 urges the outer pipe by the urging force, so that the outer pipe is supported by the inner pipe and the cross-sectional area of the air flow path is kept constant.

JP-A-2017-82728

However, in the conventional double pipe structure, the support 11 is formed by connecting the pair of holding pieces 13 and 14 with bolts and nuts bt1 and bt2, so that the double pipe structure becomes large. It ends up.

Further, since the outer pipe is supported by the urging force of the flap 19, the double pipe structure prevents the flap 19 and the inner peripheral surface of the outer pipe from sliding and sparking due to vibration of a ship or the like. It is necessary to sufficiently ground the body, which increases the cost of the double pipe structure.

Further, when the double pipe structure is used for a long period of time in a ship or the like, the support 11 may be corroded by rust or the like, and the maintenance and management of the double pipe structure is troublesome.

The present invention solves the problems of the conventional double pipe structure, can reduce the size, can reduce the cost, and can easily perform maintenance and management. The purpose is to provide structures and support.

To that end, the double pipe structure of the present invention is disposed in the engine area of the ship, includes a metal inner pipe and a metal outer pipe, and a first flow for passing fuel gas into the inner pipe. A path is formed so that a second flow path for passing air is formed between the inner pipe and the outer pipe.

A support that is integrally formed of resin and has an annular shape, is fitted to the inner pipe in the second flow path to support the outer pipe, and has a communication hole for passing air, and a fuel. It has a positioning member fixed to the inner pipe on the upstream side and the downstream side of the support in the gas flow direction, sandwiching the support, and positioning the support with respect to the inner pipe.

According to the present invention, the double pipe structure is arranged in the engine area of the ship, includes a metal inner pipe and a metal outer pipe, and a first flow for passing fuel gas into the inner pipe. A path is formed so that a second flow path for passing air is formed between the inner pipe and the outer pipe.

A support that is integrally formed of resin and has an annular shape, is fitted to the inner pipe in the second flow path to support the outer pipe, and has a communication hole for passing air, and a fuel. It has a positioning member fixed to the inner pipe on the upstream side and the downstream side of the support in the gas flow direction, sandwiching the support, and positioning the support with respect to the inner pipe.

In this case, since a communication hole for passing air is formed in the support fitted to the inner pipe in the second flow path, the structure of the support can be simplified. Therefore, the double pipe structure can be miniaturized.

Further, since the support is formed of resin, sparks do not occur even if the support and the outer peripheral surface of the inner pipe and the inner peripheral surface of the outer pipe slide due to vibration. Therefore, since the grounding structure of the double pipe structure can be simplified, the cost of the double pipe structure can be reduced.

Further, even if the double pipe structure is used for a long period of time, the support is not corroded by rust or the like, so that the maintenance and management of the double pipe structure can be easily performed.

It is a vertical sectional view of the outer pipe support part of the double pipe structure in 1st Embodiment of this invention. It is a perspective view of the support arranged in the conventional double pipe structure. It is a conceptual diagram of the main part of the ship provided with the double pipe structure in the 1st Embodiment of this invention. It is a perspective view of the double tube structure in 1st Embodiment of this invention. It is a front view of the support in 1st Embodiment of this invention. It is a perspective view of the support in 1st Embodiment of this invention. It is a 1st figure for demonstrating the assembly procedure of the linear structure part in 1st Embodiment of this invention. It is a 2nd figure for demonstrating the assembly procedure of the linear structure part in 1st Embodiment of this invention. It is a 3rd figure for demonstrating the assembly procedure of the linear structure part in 1st Embodiment of this invention. It is a 1st figure for demonstrating the method of forming a double tube structure in 1st Embodiment of this invention. It is a 2nd figure for demonstrating the method of forming a double tube structure in 1st Embodiment of this invention. It is a 3rd figure for demonstrating the method of forming a double tube structure in 1st Embodiment of this invention. It is a 4th figure for demonstrating the method of forming a double tube structure in 1st Embodiment of this invention. It is a 5th figure for demonstrating the method of forming the double tube structure in 1st Embodiment of this invention. It is a 6th figure for demonstrating the method of forming a double tube structure in 1st Embodiment of this invention. It is a 7th figure for demonstrating the method of forming a double tube structure in 1st Embodiment of this invention. It is a figure 8 for demonstrating the method of forming a double tube structure in 1st Embodiment of this invention. It is a 9th figure for demonstrating the method of forming a double tube structure in 1st Embodiment of this invention. It is a vertical sectional view of the outer pipe support part of the double pipe structure in the 2nd Embodiment of this invention. It is a front view of the support in 2nd Embodiment of this invention. It is a perspective view of the support in 3rd Embodiment of this invention. It is a perspective view of the support in 4th Embodiment of this invention. It is a perspective view of the support in 5th Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this case, a double pipe structure and a support in the engine room where the gas engine is housed 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 figure, Aru is an engine area formed in accordance with the provisions of the IGF Code at a predetermined location on the ship, and the engine area Aru is a gas safety engine area Ar1 as a first area and a second area. It consists of an ESD (emergency shutoff device) protection agency area Ar2. The gas safety engine area Ar1 is arranged with a gas engine 22 and used as an engine room. A bunker unit 25, a tank 26, a heat exchanger 28, a blower 31 as a ventilation device, and the like are arranged in the ESD protection engine area Ar2.

Further, an air intake port 33, an air discharge port 34, and an on-off valve 35 are arranged outside the engine area Aru, and a fuel line L1 connecting the tank 26 and the gas engine 22 and an air intake are provided in the engine area Aru. Ventilation lines L2 and L3 connecting the port 33 and the air discharge port 34 are arranged, and a double pipe structure Pu is provided by the fuel line L1 and the ventilation line L3 from the gas safety engine area Ar1 to the ESD protection engine area Ar2. It is formed.

The liquefied natural gas supplied from outside the engine area Aru to the ship via the bunker unit 25 is contained in the tank 26 and then sent to the heat exchanger 28 in an amount necessary to drive the gas engine 22. In the heat exchanger 28, it is heated by hot water and vaporized to be a fuel gas as a 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 the fuel gas, and is sent to the gas engine 22.

By the way, in the ship, in consideration of the case where the fuel gas leaks to the outside of the fuel line L1, the inner pipe 43 as the first element member formed by the fuel line L1 is a second structure, which is another structure. The double pipe structure Pu is formed by surrounding with the outer pipe 44 as an element member of the engine area, and air as a second fluid taken in from the outside of the engine area Aru is introduced to the inner pipe 43 and the outer pipe 44. It is supplied in between and is discharged outside the engine area Aru.

Therefore, the ventilation line L2 for intake is arranged between the air intake port 33 and the gas engine 22, and the ventilation line L3 for exhaust is arranged between the gas engine 22 and the air discharge port 34. Is arranged, and the air taken in from outside the engine area Aru by the air intake port 33 flows through the ventilation line L2, is sent to the gas engine 22, is heated in the gas engine 22, and then is formed by the ventilation line L3. After flowing between the outer pipe 44 and the inner pipe 43 and sent from the gas safety engine area Ar1 to the ESD protection engine area Ar2, it is separated from the fuel line L1 and flows through the ventilation line L3, and the blower 31 Is sent to and discharged out of the engine area Aru from the air outlet 34.

Therefore, since a negative pressure is formed by the blower 31 in the ventilation lines L2 and L3, even if the fuel gas leaks from the inner pipe 43, the fuel gas is sucked by the blower 31 without going out of the outer pipe 44. And discharged out of the engine area Aru.

In the figure, for convenience, the inner pipe 43 and the outer pipe 44 are shown adjacent to each other.

Next, the double tube structure Pu will be described. In this case, for a double pipe structure Pu having a flange attached to one end, a linearly extending portion, that is, a linear portion, and a bent portion, that is, a bent portion, and having an "L" -shaped shape. explain.

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

In the figure, Pu is a double tube structure, Di (i = 1, 2, ...) Is a plurality of linear structure portions arranged in a linear portion of the double tube structure Pu, and E1 is a double tube. Two linear structure portions arranged adjacent to the bent portion of the structure Pu, in the present embodiment, the curved structure portion connected to the linear structure portions D1 and D2, 51 is a double pipe structure Pu. Two linear structure portions arranged adjacent to each other in the linear portion of the above, in the present embodiment, a flange connecting the linear structure portion D1 and another linear structure portion (not shown). In the length direction of the double pipe structure Pu, the side on which the flange 51 is arranged is the flange side, and the opposite side is the non-flange side.

The double pipe structure Pu includes an outer pipe support portion Srj (j = 1, 2, ...) (FIG. 1), which will be described later, set at a plurality of locations in the inner pipe 43, the outer pipe 44, and the linear structure portion Di. A fuel gas flow path Rt1 as a first flow path for passing fuel gas, which is provided with a resin support 55, which will be described later, for supporting the outer pipe 44 and has a circular cross-sectional shape in the inner pipe 43. Is formed, and an air flow path Rt2 having an annular cross-sectional shape as a second flow path for passing air is formed between the inner pipe 43 and the outer pipe 44.

The inner pipe 43 is integrally formed by being bent in an "L" shape in the curved structure portion E1.

The outer pipe 44 includes a plurality of compartmentalized outer pipes Fk (k = 1, 2, ...) Arranged so as to surround the inner pipe 43 from the flange side to the non-flange side in the linear structure portion Di, and the curved structure portion E1. The inner pipe 43 is arranged so as to surround the inner pipe 43, and is provided with two elbows Gk (k = 1, 2) connecting the outer pipes Fk.

The inner pipe 43, the outer pipe 44, and the flange 51 are all made of metal, and in the present embodiment, stainless steel.

Next, the procedure for assembling the outer pipe support portion Srj and the linear structure portion Di will be described.

FIG. 1 is a vertical sectional view of an outer tube support portion of a double-tube structure according to a first embodiment of the present invention, FIG. 5 is a front view of a support according to the first embodiment of the present invention, and FIG. 6 is a book. A perspective view of the support according to the first embodiment of the present invention, FIG. 7 is a first diagram for explaining an assembly procedure of a linear structure portion according to the first embodiment of the present invention, and FIG. 8 is a first diagram of the present invention. The second figure for explaining the assembly procedure of the linear structure part in 1st Embodiment, FIG. 9 is a 3rd figure for explaining the assembly procedure of the linear structure part in 1st Embodiment of this invention. Is. The cross-sectional view of the support in FIG. 1 is a cross-sectional view taken along the line XX of FIG.

In the figure, Srj is an outer pipe support portion, 43 is an inner pipe, 44 is an outer pipe, Rt1 is a fuel gas flow path, Rt2 is an air flow path, Fk is a classified outer pipe, and 55 is an inner pipe 43 in the outer pipe support portion Srj. The supports 56 and 57 externally fitted to the inner pipe 43 are externally fitted to the inner pipe 43 at the ends of the support 55 on the flange side and the non-flange side, and are arranged so as to be in contact with the support 55 to position the support 55. It is a ring as a positioning member.

The support 55 is made of a resin or, in the present embodiment, a fluororesin, and is integrally formed by cutting a tubular member formed by a molding method such as injection molding to a predetermined length and performing machining. It is formed in and has an annular shape.

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

The rings 56 and 57 are made of metal, or stainless steel in the present embodiment, and have an inner diameter slightly smaller than the outer diameter of the inner pipe 43 so that they can be slid and fitted to the inner pipe 43. Be enlarged.

The ring 56 is adhered to and fixed to the inner tube 43 by the resin adhesive 60 applied to the edge eg1 on the flange side, and the ring 57 is attached to the inner tube by the adhesive 60 applied to the edge eg2 on the non-flange side. It is adhered to and fixed to 43.

In the present embodiment, as the adhesive 60, a one-component moisture-curable elastic adhesive made of a silicone resin containing a silyl group and suitable for adhering between metals is used.

Further, the support 55 is made of an annular body, and is formed by projecting outward in the radial direction at a plurality of locations in the circumferential direction of the annular portion 61 and the support 55, and in the present embodiment, at four locations. 65 is provided. The inner diameter of the annular portion 61 is slightly larger than the outer diameter of the inner pipe 43 so that the support 55 can be slid and fitted to the inner pipe 43.

When the support 55 is surrounded by the outer pipe 44, the support 55 has a fan-shaped shape between the convex portions 65 in the circumferential direction, and the air flow path Rt2 on the flange side and the non-flange side of the support 55 is provided. A communication hole 71 for communicating and allowing air to pass through is formed.

When assembling the linear structure portion Di in the outer pipe support portion Srj, first, as shown in FIG. 7, the ring 57, the support 55 and the ring 56 are externally fitted to the inner pipe 43 in order, and the support 55 is provided by the rings 56 and 57. It is pinched and positioned.

Next, the adhesive 60 is applied to the edge eg1 of the ring 56 and the edge eg2 of the ring 57, the rings 56 and 57 are fixed to the inner pipe 43, and the support unit Uj (j = 1) including the support 55 and the rings 56 and 57. 2, ...) Is formed. In this case, it is preferable to apply the adhesive 60 to the entire edges eg1 and eg2 in the circumferential direction, but it is also possible to apply the adhesive 60 to at least one place in the circumferential direction.

Subsequently, as shown by an arrow in FIG. 8, when the division outer pipe Fk is externally fitted to the inner pipe 43 and the support 55, a linear structure portion Di is formed as shown in FIG.

Next, a method for forming the double tube structure Pu will be described.

FIG. 10 is a first diagram for explaining a method of forming a double-tube structure according to the first embodiment of the present invention, and FIG. 11 is a double-tube structure according to the first embodiment of the present invention. A second figure for explaining the forming method, FIG. 12 is a third figure for explaining the forming method of the double tube structure in the first embodiment of the present invention, and FIG. 13 is the first aspect of the present invention. FIG. 4 for explaining a method for forming a double-tube structure in the first embodiment of the present invention, FIG. 14 is for explaining a method for forming a double-tube structure in the first embodiment of the present invention. FIG. 5, FIG. 15 is a sixth figure for explaining a method of forming a double tube structure in the first embodiment of the present invention, and FIG. 16 is a second in the first embodiment of the present invention. FIG. 17 for explaining a method for forming a heavy tube structure, FIG. 17 is a figure 8 for explaining a method for forming a double tube structure in the first embodiment of the present invention, FIG. 18 9 is a diagram for explaining a method of forming a double-tube structure according to the first embodiment of the present invention.

First, a pipe member (not shown) made of stainless steel is cut to a predetermined length and bent to obtain an inner pipe 43 having linear portions h1, h2 and bent portions h3 as shown in FIG. It is formed. eg11 is an edge on the flange side of the inner pipe 43, and egg12 is an edge on the non-flange side of the inner pipe 43.

Next, as shown by an arrow in FIG. 11, at the edge eg11 on the flange side of the inner tube 43, the ring 57, the support 55, and the ring 56 are sequentially fitted to the inner tube 43, and the ring is formed at the outer tube support portion Sr1. The support 55 is sandwiched and positioned by the 56s and 57s. Then, the adhesive 60 is applied to the edge eg1 of the ring 56 and the edge eg2 of the ring 57, the rings 56 and 57 are fixed to the inner pipe 43, and the support 55 and the rings 56 and 57 provide that as shown in FIG. The support unit U1 is formed.

Subsequently, the division outer pipe F1 is externally fitted to the inner pipe 43 and the support unit U1, and the linear structure portion D1 is formed.

Then, at the edge eg12 on the non-flange side of the inner pipe 43, the elbows G1 and G2 are fitted onto the inner pipe 43 as indicated by the arrows, and the division outer pipes F1 and the elbow G1 are also included in the elbow G1 and the elbow. G2 is joined by welding to form a curved structure E1 as shown in FIG. At this time, the edge eg11 on the flange side of the inner pipe 43 and the edge eg13 on the flange side of the outer pipe F1 are brought into contact with the flange 51, and the inner pipe 43, the outer pipe F1 and the flange 51 are joined by welding. Will be done.

Next, as shown in FIG. 15, at the edge eg12 on the non-flange side of the inner tube 43, the ring 56, the support 55, and the ring 57 are sequentially fitted to the inner tube 43, and the ring 56 is formed at the outer tube support portion Sr2. , 57 sandwiches the support 55, the adhesive 60 fixes the rings 56 and 57 to the inner pipe 43, and the ring 56, the support 55 and the ring 57 are sequentially fitted to the inner pipe 43, and the outer pipe support portion Sr3 In, the support 55 is sandwiched by the rings 56 and 57, and the rings 56 and 57 are fixed to the inner pipe 43 by the adhesive 60. In this way, as shown in FIG. 16, the support unit U2 is formed in the outer pipe support portion Sr2, and the support unit U3 is formed in the outer pipe support portion Sr3.

Subsequently, as shown by an arrow in FIG. 17, the division outer pipe F2 is externally fitted to the inner pipe 43 and the support units U2 and U3 at the edge eg12 on the non-flange side of the inner pipe 43.

Then, when the elbow G2 and the outer pipe F2 are joined by welding, a linear structure portion D2 is formed as shown in FIG.

In this way, as shown in FIG. 18, a double tube structure Pu composed of a linear structure portion Di and a curved structure portion E1 is formed.

As described above, in the present embodiment, the support 55 integrally formed of the resin is arranged in the air flow path Rt2 between the inner pipe 43 and the outer pipe 44, and is between the support 55 and the outer pipe 44. Since the communication hole 71 for passing air is formed in the support 55, the structure of the support 55 can be simplified. Therefore, the double pipe structure Pu can be miniaturized and the mountability on a ship can be improved.

Further, since the support 55 is formed of resin, sparks do not occur even if the support 55 and the outer peripheral surface of the inner pipe 43 and the inner peripheral surface of the outer pipe 44 slide due to vibration. Therefore, the grounding structure of the double pipe structure Pu can be simplified, and the cost of the double pipe structure Pu can be reduced.

Further, even if the double pipe structure Pu is used for a long period of time, the support 55 is not corroded by rust or the like, so that the maintenance and management of the double pipe structure Pu can be simplified.

Further, since it is not necessary to join the rings 56 and 57 for positioning the support 55 to the inner pipe 43 by welding, the support 55 is not damaged by heat. Therefore, the durability of the support 55 can be further improved.

Next, a second embodiment of the present invention in which the support 55 is positioned without using the adhesive 60 will be described. The same reference numerals are given to those having the same structure as that of the first embodiment, and the effects of the same embodiment are used for the effects of the invention due to having the same structure.

FIG. 19 is a vertical sectional view of an outer pipe support portion of the double pipe structure according to the second embodiment of the present invention, and FIG. 20 is a front view of the support according to the second embodiment of the present invention. The cross-sectional view of the support in FIG. 19 is a YY cross-sectional view of FIG.

In the figure, Srj is an outer pipe support portion, 43 is an inner pipe as a first element member, 44 is an outer pipe as a second element member, Rt1 is a fuel gas flow path as a first flow path, and Rt2 is. The air flow path as the second flow path, Fk is the outer pipe for division, 55 is the support, and 66 and 67 are externally fitted to the inner pipe 43 at the flange side and non-flange side ends of the support 55 and are supported. It is a sleeve as a positioning member that is arranged in contact with the 55 and positions the support 55.

The sleeves 66 and 67 are made of metal, or stainless steel in the present embodiment, and have an inner diameter slightly smaller than the outer diameter of the inner pipe 43 so that the sleeves 66 and 67 can be slid and fitted to the inner pipe 43. Be enlarged.

The sleeve 66 is fixed to the inner pipe 43 by welding the edge eg21 on the flange side, and the sleeve 67 is fixed to the inner pipe 43 by welding the edge eg22 on the non-flange side. The support unit Wj (j = 1, 2, ...) Is configured by the support 55 and the sleeves 66 and 67 that sandwich the support 55.

The axial lengths of the sleeves 66 and 67 are set to predetermined values so that the heat generated when the sleeves 66 and 67 are fixed to the inner pipe 43 by welding is not transferred to the support 55 and the support 55 is damaged. In the embodiment, it is set to 100 [mm] or more.

Next, a third embodiment of the present invention will be described in which the support can be positioned with respect to the inner tube 43 without using the rings 56, 57 (FIG. 1), sleeves 66, 67, and the like. do. The same reference numerals are given to those having the same structure as those of the first and second embodiments, and the effects of the same embodiment are used for the effects of the invention due to having the same structure.

FIG. 21 is a perspective view of the support according to the third embodiment of the present invention.

In the figure, reference numeral 75 is made of a resin and, in the present embodiment, a fluororesin, and is integrally formed by cutting a tubular member formed by a molding method such as injection molding to a predetermined length and performing machining. It is a support that is formed in and has an annular shape.

The support 75 has an annular shape, and is formed by projecting outward in the radial direction at a plurality of annular portions 81 and a plurality of locations in the circumferential direction of the annular portion 81, and in the present embodiment, at four locations. A convex portion 65 is provided. The inner diameter of the annular portion 81 is slightly larger than the outer diameter of the inner pipe 43 so that the support 75 can be slid and fitted to the inner pipe 43 (FIG. 1) as the first element member. To.

When the support 75 is surrounded by the outer pipe 44, it has a fan-shaped shape between the convex portions 65 in the circumferential direction of the support 75, and is a second flow path on the flange side and the non-flange side of the support 75. The air flow path Rt2 is communicated with each other, and a communication hole (not shown) for passing air is formed.

Further, the grooves m1 and m2 having a semicircular cross section extending in the axial direction at a plurality of locations in the circumferential direction of the inner peripheral surface Sa of the annular portion 81, and in the present embodiment, at two locations. Is formed, and the step portions 87 and 88 having a semicircular shape are formed at both ends of the grooves m1 and m2 with a diameter slightly larger than the diameter of the grooves m1 and m2.

When assembling the linear structure portion Di (FIG. 4) in the outer pipe support portion Srj, the support 75 is externally fitted to the inner pipe 43, and subsequently, as a positioning member in the gap between the grooves m1 and m2 and the inner pipe 43. Adhesive 60 (FIG. 7) is injected. In the present embodiment, as the adhesive 60, the above-mentioned one-component moisture-curable elastic adhesive made of a silicone resin containing a silyl group is used.

As a result, the support 75 is positioned with respect to the inner tube 43 by the adhesive 60. That is, since the adhesive 60 solidifies at the stepped portions 87 and 88 to form the enlarged diameter portion, the support 75 moves in the axial direction and does not come off from the solidified adhesive 60.

Next, a fourth embodiment of the present invention will be described in which the support 75 can be positioned with respect to the inner tube 43 without using the rings 56, 57, sleeves 66, 67 and the like. The same reference numerals are given to those having the same structure as those of the first to third embodiments, and the effects of the same embodiment are used for the effects of the invention due to having the same structure.

FIG. 22 is a perspective view of the support according to the fourth embodiment of the present invention.

In this case, the ends of the inner peripheral surface Sa of the annular portion 81 on the flange side and the non-flange side extend in the circumferential direction to a plurality of locations in the circumferential direction, and in the present embodiment, to two locations in the circumferential direction. The grooves m3 and m4 having an arcuate shape are formed.

When assembling the linear structure portion Di (FIG. 4) in the outer pipe support portion Srj (FIG. 1), the support 75 is externally fitted to the inner pipe 43 as the first element member, and then the grooves m3, m4 and the inner pipe are fitted. The adhesive 60 (FIG. 7) as a positioning member is injected into the gap between the body and the 43.

As a result, the support 75 is positioned with respect to the inner tube 43 by the adhesive 60. That is, since the adhesive 60 solidifies in the grooves m3 and m4, the support 75 does not move in the axial direction.

Next, a fifth embodiment of the present invention in which a communication hole is formed in the support will be described. The same reference numerals are given to those having the same structure as those of the first and second embodiments, and the effects of the same embodiment are used for the effects of the invention due to having the same structure.

FIG. 23 is a perspective view of the support according to the fifth embodiment of the present invention.

In the figure, 85 is made of a resin, or a fluororesin in the present embodiment, and is integrated by cutting a tubular member formed by a molding method such as injection molding to a predetermined length and performing machining. It is a support that is formed in and has an annular shape.

Further, the support 85 is a second annular body formed at a predetermined distance from the inner annular portion 91 as the first annular body and the inner annular portion 91 radially outward from the inner annular portion 91. A plurality of locations in the circumferential direction of the outer annular portion 92 and the support 85, and in the present embodiment, four locations are provided with connecting portions 93 for connecting the inner annular portion 91 and the outer annular portion 92. The support 85 is slid and fitted to the inner pipe 43 (FIG. 1) as the first element member, and the support 85 is slid and fitted to the outer pipe 44 as the second element member. The inner diameter of the inner annular portion 91 is slightly larger than the outer diameter of the inner pipe 43, and the outer diameter of the outer annular portion 92 is slightly smaller than the inner diameter of the outer pipe 44.

Then, the air flow path Rt2, which has a fan-shaped shape and is used as the second flow path on the flange side and the non-flange side of the support 85, is communicated between the connecting portions 93 in the circumferential direction of the support 85 to allow air to communicate with each other. A communication hole 94 for passing through is formed.

In this embodiment, rings 56, 57 (FIG. 1), sleeves 66, 67 (FIG. 19), adhesive 60 (FIG. 7), and the like are used as positioning members for positioning the support 85.

The present invention is not limited to each of the above-described embodiments, and various modifications can be made based on the gist of the present invention, and these are not excluded from the scope of the present invention.

43 Inner pipe 44 Outer pipe 55, 75, 85 Support 56, 57 Ring 66, 67 Sleeve 71, 94 Communication hole Pu Double pipe structure Rt1 Fuel gas flow path Rt2 Air flow path

Claims (10)

Arranged in the engine area of the ship, it is equipped with a metal inner pipe and a metal outer pipe, and a first flow path for passing fuel gas is formed in the inner pipe, and between the inner pipe and the outer pipe. In a double pipe structure in which a second flow path for passing air is formed.
(A) A support that is integrally formed of a resin, has an annular shape, is fitted to an inner pipe in the second flow path, supports the outer pipe, and has a communication hole for passing air .
(B) It is characterized by having a positioning member fixed to the inner pipe on the upstream side and the downstream side of the support in the flow direction of the fuel gas , sandwiching the support, and positioning the support with respect to the inner pipe. Heavy tube structure. The double tube structure according to claim 1, wherein the positioning member is a ring fixed to an inner tube by an adhesive. The double pipe structure according to claim 1, wherein the positioning member is a sleeve fixed to an inner pipe by welding. The double pipe structure according to claim 1, wherein the positioning member is an adhesive that is injected into a groove formed in a support, solidified , and fixed to an inner pipe . The double tube structure according to any one of claims 1 to 4, wherein the support is formed of a fluororesin. Arranged in the engine area of the ship, it is equipped with a metal inner pipe and a metal outer pipe, and a first flow path for passing fuel gas is formed in the inner pipe, and between the inner pipe and the outer pipe. In the support, which is arranged in the second flow path in the double pipe structure in which the second flow path for passing air is formed and is integrally formed by the fluororesin.
(A) An annular body fitted in the inner tube and
(B) Formed at a plurality of locations in the circumferential direction so as to project radially outward from the annular body, and have convex portions for supporting the outer tube .
(C) A support characterized by being sandwiched by a positioning member fixed to an inner pipe on the upstream side and the downstream side of the support in the flow direction of the fuel gas and positioned with respect to the inner pipe. Arranged in the engine area of the ship, it is equipped with a metal inner pipe and a metal outer pipe, and a first flow path for passing fuel gas is formed in the inner pipe, and between the inner pipe and the outer pipe. In the support, which is arranged in the second flow path in the double pipe structure in which the second flow path for passing air is formed and is integrally formed by the fluororesin.
(A) The first annular body fitted to the inner tube and
(B) A second annular body formed at a predetermined distance from the first annular body in the radial direction from the first annular body and for supporting the outer tube .
(C) It has a connecting portion for connecting the first and second annular bodies at a plurality of locations in the circumferential direction, and also has a connecting portion.
(D) A support characterized by being sandwiched by a positioning member fixed to an inner pipe on the upstream side and the downstream side of the support in the flow direction of the fuel gas and positioned with respect to the inner pipe. The support according to claim 6 or 7, wherein the positioning member is a ring fixed to an inner tube by an adhesive. The support according to claim 6 or 7, wherein the positioning member is a sleeve fixed to an inner pipe by welding. The support according to claim 6 or 7, wherein the positioning member is an adhesive that is injected into a groove formed in the support, solidified , and fixed to an inner tube .

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