JP2023156798A - Double pipe structure, formation method of the same, and pipe support member - Google Patents

Abstract

To achieve simplification of work for forming a double pipe structure.SOLUTION: A double pipe structure includes an inner pipe 43 and an outer pipe 44. A first passage for allowing a first fluid to circulate therethrough is formed within the inner pipe 43 and a second passage for allowing a second fluid to circulate therethrough is formed between the inner pipe 43 and the outer pipe 44. The double pipe structure has: a support ring 63 which is formed of an annular body integrally formed with a resin and disposed enclosing the inner pipe 43; and holding bodies 65, 66 which are attached to the outer pipe 44 and hold the support ring 63. The holding bodies are attached to predetermined portions as seen in a longitudinal direction of the outer pipe 44 and the support ring 63 is held by the holding bodies 65, 66. Thus, it is not necessary to fit the outer pipe 44 on the support ring 63. Therefore, it is not necessary to adjust fitting between the support ring 63 and the outer pipe 44.SELECTED DRAWING: Figure 1

Description

The present invention relates to a double tube structure, a method for forming the same, and a tube support member.

Conventionally, for vessels that use liquefied natural gas (LNG) as fuel gas and drive gas engines to navigate, the IGC Code, IGF Code, etc. define the engine room where the gas engine is housed as a gas safe machinery space. space). In an engine room designed in accordance with the regulations, the fuel line, which is the piping through which the fuel gas flows, and equipment that comes in contact with the fuel gas, are surrounded by another structure in order to prevent fuel gas from leaking. It has a double-pipe structure, and the inside of the double-pipe structure is constantly ventilated (for example, see Patent Document 1).

In the double pipe structure, a fuel gas flow path is formed within the inner pipe, and an annular ventilation air flow path is formed between the inner pipe and the outer pipe, and the cross-sectional area of the air flow path is kept constant. Supports serving as tube support members for maintaining the tube are disposed at predetermined locations in the longitudinal direction.

FIG. 2 is a perspective view of a support provided in a conventional double-pipe structure, and FIG. 3 is a diagram for explaining the vertical assembly procedure of the conventional double-pipe structure.

In the figure, Pu is a double tube structure, 43 is an inner tube, 44 is an outer tube, 45 is a support as a tube support member that is arranged to surround the inner tube 43 and supports the inner tube 43, 47 is fitted onto the inner tube 43 at one end and the other end of the double tube structure Pu, and is disposed in contact with the support 45, so that the support 45 is connected to the inner tube 43. This is a ring as a positioning member for positioning.

The support 45 is integrally formed by cutting a cylindrical member made of fluororesin into a predetermined length using a molding method such as injection molding, and performing machining, and has an annular shape.

The rings 46 and 47 are made of stainless steel, and their inner diameters are slightly larger than the outer diameter of the inner tube 43 so that they can be slid onto and fitted onto the inner tube 43.

The ring 46 is bonded and fixed to the inner tube 43 with a resin adhesive 48 applied to the edge eg1, and the ring 47 is bonded and fixed to the inner tube 43 with an adhesive 48 applied to the edge eg2. Ru.

The support 45 is formed of an annular body, and includes an annular portion 51 and convex portions formed to protrude outward in the radial direction at multiple locations in the circumferential direction of the support 45 (in this embodiment, four locations). 52. Note that the inner diameter of the annular portion 51 is made slightly larger than the outer diameter of the inner tube 43 so that the support 45 can be slid and fitted onto the inner tube 43.

When the outer tube 44 is fitted onto the support 45, a fan-like shape is formed between each convex portion 52 in the circumferential direction of the support 45, and an air flow path between the inner tube 43 and the outer tube 44 is communicated. A communication hole is formed to allow air to pass through.

JP2017-82728A

However, in the conventional double tube structure Pu, when the outer tube 44 is fitted onto the supports 45 disposed at multiple locations on the inner tube 43, the fitting between the supports 45 and the outer tube 44 is difficult. adjustment is required, and the work to form a double tube structure is cumbersome.

Further, in the conventional double tube structure Pu, the rings 46 and 47 are necessary to position the support 45 with respect to the inner tube 43, and the rings 46 and 47 are bonded to the inner tube 43 with an adhesive 48. Therefore, the work to form the double pipe structure is more troublesome.

The present invention provides a double-pipe structure, a method for forming the same, and a pipe that can solve the problems of the conventional double-pipe structure Pu and simplify the work for forming the double-pipe structure. The purpose is to provide a support member.

For this purpose, the double tube structure of the present invention includes an inner tube and an outer tube, and a first flow path for passing the first fluid is formed in the inner tube, and a gap between the inner tube and the outer tube. A second flow path for passing a second fluid is formed in the second fluid.

The support ring is made of an annular body integrally formed of resin, and includes a support ring that surrounds the inner tube, and a holder that is attached to a predetermined location of the outer tube and holds the support ring. .

According to the present invention, the double tube structure includes an inner tube and an outer tube, a first flow path for passing a first fluid is formed in the inner tube, and a gap between the inner tube and the outer tube. A second flow path for passing a second fluid is formed in the second fluid.

The support ring is made of an annular body integrally formed of resin, and includes a support ring that surrounds the inner tube, and a holder that is attached to a predetermined location of the outer tube and holds the support ring. .

In this case, a holder is attached to a predetermined location on the outer tube, and the support ring is held by the holder, so there is no need to fit the outer tube onto the support ring, and there is no need to fit the outer tube onto the support ring. There is no need to adjust the fit.

Further, the support ring can be positioned with respect to the inner tube simply by attaching the holder to the outer tube.

Therefore, the work for forming the double pipe structure can be simplified.

FIG. 1 is a perspective view of a double pipe structure according to an embodiment of the present invention. It is a perspective view of the support arrange|positioned in the conventional double pipe structure. It is a figure for explaining the vertical assembly procedure of the conventional double pipe structure. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a conceptual diagram of main parts of a ship equipped with a double pipe structure according to an embodiment of the present invention. FIG. 1 is a longitudinal cross-sectional view of a double pipe structure in an embodiment of the present invention. FIG. 1 is a cross-sectional view of a double pipe structure in an embodiment of the present invention. FIG. 3 is a perspective view of a support ring in an embodiment of the present invention. FIG. 2 is a perspective view of a holder in an embodiment of the present invention. It is a figure which shows the state which attaches a holding body to the support ring in embodiment of this invention. It is a perspective view showing a support unit in an embodiment of the present invention. FIG. 2 is a perspective view of a double tube structure in which a support unit is incorporated in an embodiment of the present invention. FIG. 2 is a longitudinal sectional view of a double pipe structure in which a support unit is incorporated in an embodiment of the present invention. FIG. 2 is a cross-sectional view of a double pipe structure in which a support unit is incorporated in an embodiment of the present invention. FIG. 1 is a first diagram for explaining a method of forming a double pipe structure according to an embodiment of the present invention. It is the 2nd figure for explaining the formation method of the double tube structure in an embodiment of the present invention. FIG. 3 is a third diagram for explaining a method for forming a double pipe structure according to an embodiment of the present invention. FIG. 4 is a fourth diagram for explaining a method for forming a double pipe structure according to an embodiment of the present invention. FIG. 5 is a fifth diagram for explaining a method for forming a double pipe structure according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this case, a double pipe structure in an engine room in which a gas engine is housed, a method for forming the double pipe structure, and a support unit as a pipe support member will be described.

FIG. 4 is a conceptual diagram of the main parts of a ship equipped with a double pipe structure according to an embodiment of the present invention.

In the figure, Aru is a machinery space formed in a predetermined location of the ship in accordance with the provisions of the IGF Code, and the machinery space Aru includes a gas-safe machinery space Ar1 as the first area, and a gas-safe machinery area Ar1 as the second area. Consists of ESD (Emergency Shutdown Device) protected machinery area Ar2. The gas safe engine area Ar1 is used as an engine room where the gas engine 22 is disposed. A bunker unit 25 for supplying liquefied natural gas to the ship, a tank 26 for storing liquefied natural gas, a heat exchanger 28, a blower 31 as a ventilation device, etc. are arranged in the ESD protected machinery area Ar2.

Furthermore, an air intake port 33, an air outlet port 34, and an on-off valve 35 are arranged outside the machinery area Aru, and a fuel line L1 connecting the tank 26 and the gas engine 22, and an air intake port are provided inside the machinery area Aru. Ventilation lines L2 and L3 connecting the inlet 33 and the air outlet 34 are provided, and the fuel line L1 and the ventilation line L3 extend from the gas-safe engine area Ar1 to the ESD-protected engine area Ar2 through the double pipe structure Pu. is formed.

Liquefied natural gas supplied to the ship from outside the machinery area Aru via the bunker unit 25 is stored in a tank 26 and then sent to the heat exchanger 28 in the amount necessary to drive the gas engine 22. The fuel gas is heated and vaporized by hot water in the heat exchanger 28, and is made into fuel gas at a predetermined temperature, for example, about 40 [° C.].

The fuel gas flows as a first fluid through the fuel line L1, which is a piping for fuel gas, and is sent to the gas engine 22. After the gas engine 22 is driven, it is sent outside the ship via an exhaust gas line (not shown). is discharged.

By the way, in ships, in consideration of the case where fuel gas leaks out of the fuel line L1, the inner pipe 43 as the first element member formed by the fuel line L1 is replaced with a ventilation line, which is a separate structure. The double pipe structure Pu is formed by surrounding the outer pipe 44 as a second element member formed by L3, and the air as the second fluid taken in from outside the engine area Aru flows through the inner pipe. 43 and the outer pipe 44, and is discharged outside the engine area Aru.

For this purpose, the ventilation line L2 for intake is provided between the air intake port 33 and the gas engine 22, and the ventilation line L2 for exhaust is provided between the gas engine 22 and the air outlet 34. A line L3 is provided, and air taken in from outside the machinery area Aru by the air intake port 33 flows through the ventilation line L2 and is sent to the gas engine 22, and after being heated within the gas engine 22, the air is 44 and the inner pipe 43, and is sent from the gas-safe engine area Ar1 to the ESD-protected engine area Ar2, separated from the fuel line L1, flows through the ventilation line L3, and is sent to the blower 31. It is discharged from the discharge port 34 to the outside of the machinery area Aru.

Therefore, since negative pressure is formed in the ventilation lines L2 and L3 by the blower 31, even if fuel gas leaks from the inner pipe 43, the fuel gas will not leak out of the outer pipe 44 and will be sucked in by the blower 31. and discharged outside the machinery area Aru.

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

Next, the double pipe structure Pu will be explained.

FIG. 1 is a perspective view of a double pipe structure in an embodiment of the present invention, FIG. 5 is a longitudinal sectional view of a double pipe structure in an embodiment of the present invention, and FIG. 6 is a perspective view of a double pipe structure in an embodiment of the present invention. A cross-sectional view of a heavy pipe structure, FIG. 7 is a perspective view of a support ring in an embodiment of the present invention, FIG. 8 is a perspective view of a holder in an embodiment of the present invention, and FIG. 9 is a perspective view of an embodiment of the present invention. FIG. 10 is a perspective view showing the support unit according to the embodiment of the present invention, and FIG. 11 is a diagram showing the state in which the support unit according to the embodiment of the present invention is installed. FIG. 12 is a perspective view of the tube structure, FIG. 12 is a vertical sectional view of the double tube structure with the support unit incorporated in the embodiment of the present invention, and FIG. 13 is a perspective view of the double tube structure with the support unit incorporated in the embodiment of the present invention FIG.

In the figure, Pu is a double-pipe structure, and the double-pipe structure Pu is provided with a plurality of unillustrated pipes arranged at necessary locations in the machinery space Aru in order to pipe the double-pipe structure Pu. The inner tube 43 is disposed to connect the flanges, and the outer tube 44 is disposed surrounding the inner tube 43.

Both the inner tube 43 and the outer tube 44 are made by cutting a tube member made of a metal material, stainless steel in this embodiment, into a predetermined length, and using the tube members necessary for piping the double tube structure Pu. It is formed by performing bending work accordingly.

Each flange is made of a metal material, stainless steel in this embodiment, and is made of a plate member having a predetermined shape, in this embodiment, a disk shape, and has inner tubes 43 on both sides. An inner tube connecting portion and an outer tube connecting portion for connecting the outer tube 44 are formed.

Both ends of the inner tube 43 are fixed to inner tube connecting portions formed on each flange by welding so as to seal the inside and outside of the inner tube 43, and both ends of the outer tube 44 are formed on each flange. A gas flow path Rt1 as a first flow path, which is fixed to the outer tube connection portion by welding so that the inside and outside of the outer tube 44 are sealed, and has a circular cross-sectional shape in the inner tube 43, is connected to the inner tube 43. An air flow path Rt2 as a second flow path having an annular cross-sectional shape is formed between the outer tube 44 and the outer tube 44 . Note that a plurality of fuel gas holes (not shown) are formed in the flange between the inner tube connecting portion and the outer tube connecting portion to communicate the upstream and downstream gas passages Rt1 and to allow the fuel gas to pass therethrough. A plurality of air holes (not shown) for communicating the upstream and downstream air channels Rt2 and passing air therethrough are formed radially outward from the outer tube connecting portion.

Support arrangement positions St1 are set at a plurality of predetermined locations in the longitudinal direction of the double pipe structure Pu, and a support unit 61 as a pipe support member is arranged at each support arrangement position St1, and the support unit 61 The inner tube 43 is supported by.

The support unit 61 is arranged to surround the inner tube 43, and includes a support ring 63 as a tube support annular body made of a resin material, fluororesin in this embodiment, and a predetermined ring in the circumferential direction of the outer tube 44. In this embodiment, a pair of parts are attached to the upper and lower ends of the outer tube 44 by welding, hold the support ring 63 in the longitudinal direction of the double tube structure Pu, and position it with respect to the inner tube 43. It consists of holders 65 and 66 as positioning members.

The support ring 63 is made of an annular body made of a resin material, in this embodiment, a fluororesin, using a molding method such as injection molding. It has an inner diameter slightly larger than the diameter. In addition, so that the support ring 63 can be positioned by the holders 65 and 66, as shown in FIG. , a groove m1 having a predetermined width, a predetermined depth, and an annular shape is formed over the entire circumferential direction.

In this embodiment, the support ring 63 is made of a fluororesin that has high wear resistance, heat resistance, and weather resistance, so that even if the double tube structure Pu is used for a long period of time, the support ring 63 will remain stable. There is no deformation, and the durability of the support unit 61 can be improved.

The holding bodies 65 and 66 are formed by pressing a metal material, in this embodiment, a steel material made of stainless steel, and have a "parallel" shape as shown in FIG. . Further, the holders 65 and 66 have a cylindrical shape, and are provided with a post 68 for attaching the holders 65 and 66 to the outer tube 44, and integrally with the post 68, and extending from one end of the post 68 to the left and right. A support holding portion 69 is provided which is branched and curved into a “U” shape (semicircular shape).

In order to allow the support holding part 69 to enter the groove m1, the radius of curvature of the inner peripheral surface of the support holding part 69 is made slightly larger than the radius of curvature of the outer peripheral surface of the groove m1.

For example, as shown in FIG. 9, when the support holding part 69 enters the groove m1 of the support ring 63 and the holding bodies 65 and 66 are attached to the support ring 63, the support unit 61 is formed.

At the support arrangement position St1, in order to attach the support unit 61 to the upper and lower ends of the outer tube 44, holes h1 are formed at the upper and lower ends of the outer tube 44 at a pitch angle of 180 degrees. is formed. The inner diameter of the hole h1 is made slightly larger than the outer diameter of the post 68 so that the post 68 can be fitted into each hole h1.

With each post 68 fitted into each hole h1, the holders 65 and 66 are moved radially outward in the outer tube 44, and then the support ring 63 fitted externally into the inner tube 43 is moved. is inserted between the holders 65 and 66, and the holders 65 and 66 are moved radially inward to allow the support holding part 69 to enter the groove m1 of the support ring 63, thereby separating the support ring 63 and the support holding part 69. When engaged, the support unit 61 is assembled in the double tube structure Pu, as shown in FIG.

Subsequently, the outer circumferential surface of the post 68 and the inner circumferential surface of the hole h1 are welded to seal the inside and outside of the outer tube 44, and the support unit 61 is attached to the double tube structure Pu.

Note that when the support unit 61 is attached to the double tube structure Pu, the posts 68 of the holders 65 and 66 are radially outward from the upper and lower ends of the outer tube 44, as shown in FIGS. It is made to protrude towards.

Therefore, after the support unit 61 is assembled to the double tube structure Pu, the other end of the post 68, which protrudes from the upper and lower ends of the outer tube 44, is cut and removed by a cutter or the like (not shown). . As a result, a double tube structure Pu as shown in FIGS. 1, 5 and 6 is formed.

Further, in the figure, Sb is a cut surface when the post 68 is cut, and Pt1 is a weld metal portion formed between the outer circumferential surface of the post 68 and the inner circumferential surface of the hole h1.

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

FIG. 14 is a first diagram for explaining the method for forming a double tube structure in the embodiment of the present invention, and FIG. 15 is a first diagram for explaining the method for forming the double tube structure in the embodiment of the present invention. FIG. 16 is a third diagram for explaining the method of forming a double tube structure according to an embodiment of the present invention, and FIG. 17 is a diagram showing a method of forming a double tube structure according to an embodiment of the present invention. The fourth diagram is for explaining the formation method, and FIG. 18 is the fifth diagram for explaining the formation method of the double pipe structure in the embodiment of the present invention.

First, as shown in FIG. 14, the inner tube 43 and the outer tube 44 are formed by cutting a tube member to a predetermined length, the support ring 63 is formed by injection molding, etc., and the holders 65, 66 are formed by pressing, etc. It is formed. As described above, the holes h1 through which the posts 68 of the holders 65 and 66 pass are formed at the upper and lower ends of the outer tube 44 at the support arrangement position St1.

Next, as shown in FIG. 15, the holders 65 and 66 are inserted into the outer tube 44 from a predetermined end eg1 of the outer tube 44, and each post 68 is passed through the hole h1 in the outer tube 44. It will be done.

Subsequently, as shown in FIG. 16, the holders 65 and 66 are moved radially outward within the outer tube 44, the post 68 is caused to protrude from the hole h1 by a sufficient amount, and the support holder 69 is The inner tube 43 , which is brought close to the inner circumferential surface of the outer tube 44 and has the support ring 63 fitted thereon, is advanced into the outer tube 44 .

Next, the holders 65 and 66 are moved radially inward, and the support holder 69 is entered into the aforementioned groove m1 (FIG. 7) of the support ring 63, so that the support ring 63 and the support holder 69 When these are engaged, the support unit 61 is formed at the support arrangement position St1 of the double pipe structure Pu, as shown in FIG. Then, the welding device 71 welds the outer peripheral surface of the post 68 and the inner peripheral surface of the hole h1.

Subsequently, the other end of the post 68, which protrudes from the upper and lower ends of the outer tube 44, is cut with a cutter or the like and removed. As a result, a double pipe structure Pu as shown in FIG. 18 is formed.

As described above, in this embodiment, the holders 65 and 66 are attached to predetermined locations of the outer tube 44, and the support ring 63 is held by the holders 65 and 66, so that the support ring 63 is attached to the outer tube. 44, and there is no need to adjust the fit between the support ring 63 and the outer tube 44.

Further, the support ring 63 can be positioned with respect to the inner tube 43 simply by attaching the holders 65 and 66 to the outer tube 44.

Therefore, the work for forming the double pipe structure Pu can be simplified.

Further, since the support holding portions 69 of the holding bodies 65 and 66 hold the support ring 63 near the outer circumferential surface of the inner tube 43, there is an air flow between the support holding portions 69 and the inner circumferential surface of the outer tube 44. A sufficiently large space is formed that communicates the upstream side and the downstream side of the road Rt2. Therefore, the air flow is not obstructed by the support unit 61.

Note that the present invention is not limited to the embodiments described above, and various modifications can be made based on the spirit of the present invention, and these are not excluded from the scope of the present invention.

43 Inner tube 44 Outer tube 63 Support rings 65, 66 Holder Pu Double tube structure Rt1 Gas flow path Rt2 Air flow path

Claims (6)

It includes an inner tube and an outer tube, a first passage for passing a first fluid is formed in the inner tube, and a second passage for passing a second fluid is formed between the inner tube and the outer tube. In a double tube structure in which a flow path is formed,
(a) a support ring consisting of an annular body integrally formed of resin and disposed surrounding the inner tube;
(b) A double tube structure characterized by having a holder attached to a predetermined location of the outer tube and holding the support ring. The double pipe structure according to claim 1, wherein the holding body includes a post attached to the outer pipe, and a support holding part formed by branching from one end of the post. (a) the support ring includes a groove having an annular shape;
(b) The double-pipe structure according to claim 2, wherein the support holding portion is formed in a curved manner and is inserted into the groove to hold the support ring. (a) the outer tube includes a hole formed at the predetermined location by penetrating the inside and outside of the outer tube;
(b) The double tube structure according to any one of claims 1 to 3, wherein the holding body is attached to the outer tube by welding the outer peripheral surface of the post and the inner peripheral surface of the hole. (a) inserting a holder including a post and a support holder into the outer tube;
(b) passing a post through a hole formed in a predetermined location of the outer tube, moving the holding body radially outward, and inserting the inner tube with the support ring fitted onto the outer tube into the outer tube;
(c) A method for forming a double tube structure, comprising moving the holding body radially inward to engage the support holding portion and the support ring. It includes an inner tube and an outer tube, a first passage for passing a first fluid is formed in the inner tube, and a second passage for passing a second fluid is formed between the inner tube and the outer tube. In a tube support member disposed in a double tube structure in which a flow path is formed,
(a) a support ring consisting of an annular body integrally formed of resin and disposed surrounding the inner tube;
(b) A tube support member comprising: a post; and a holder having a support holding portion that is formed by branching from one end of the post and that holds the support ring.

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