KR20230146990A - Dual pipe structure, its manufacturing method and pipe support - Google Patents

Abstract

(Task) To simplify the work to form a double pipe structure.
(Solution) It is provided with an inner pipe 43 and an outer pipe 44, a first flow path for passing the first fluid is formed within the inner pipe 43, and a second flow path is formed between the inner pipe 43 and the outer pipe 44. It is configured to form a second flow path for passing fluid. A support ring 63 made of an annular body integrally formed of resin and disposed surrounding the inner tube 43, and a retainer 65 attached to the outer tube 44 and holding the support ring 63, 66). A retainer is attached to a predetermined location in the longitudinal direction of the outer shell 44, and the support ring 63 is held by the retainers 65 and 66, so it is necessary to couple the outer shell 44 to the support ring 63. There is no need to adjust the coupling state between the support ring 63 and the exterior 44.

Description

Double pipe structure, its formation method and pipe support member {DUAL PIPE STRUCTURE, ITS MANUFACTURING METHOD AND PIPE SUPPORT}

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

Conventionally, for ships that use liquefied natural gas (LNG) as fuel gas and drive a gas engine to sail, the IGC code, IGF code, etc. require the engine room where the gas engine is accommodated to be a gas safe machinery space. It is stipulated. In an engine room designed in accordance with the relevant regulations, in consideration of fuel gas leaks, the fuel lines, which are pipes through which fuel gas flows, and devices in contact with fuel gas are surrounded by separate structures, resulting in a double pipe structure. The interior is configured to be ventilated at all times (for example, see Patent Document 1).

In the double pipe structure, a fuel gas passage is formed within the inner pipe, a circular ventilation air passage is formed between the inner pipe and the outer pipe, and a support as a pipe support member to keep the cross-sectional area of the air passage constant is provided in the longitudinal direction. It is placed at a predetermined location in .

Figure 2 is a perspective view of a support disposed in a conventional double pipe structure, and Figure 3 is a diagram for explaining the vertical assembly sequence of a conventional double pipe structure.

In the drawing, Pu is a double pipe structure, 43 is the inner pipe, 44 is the exterior, 45 is arranged surrounding the inner pipe 43, is a support as a pipe support member supporting the inner pipe 43, and 46 and 47 are the double pipe structure (Pu). It is a ring that is coupled to the inner tube (43) at one end and the other end and is arranged to be in close contact with the support (45) as a positioning member for positioning the support (45) with respect to the inner tube (43).

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

The rings 46 and 47 are made of stainless steel, and their inner diameter is slightly larger than the outer diameter of the inner tube 43 so that they can be slidably coupled to the inner tube 43.

The ring 46 is adhered and fixed to the inner tube 43 by a resin adhesive 48 applied to the edge eg1, and the ring 47 is attached to the inner tube 43 by an adhesive 48 applied to the edge eg2. It is glued and fixed at (43).

In addition, the support 45 is made of an annular body, and has an annular portion 51 and a convex portion formed to protrude outward in the radial direction at a plurality of locations in the circumferential direction of the support 45, and at four locations in the present embodiment. (52) is provided. In addition, the inner diameter of the annular portion 51 is slightly larger than the outer diameter of the inner tube 43 so that the support 45 can be slidably coupled to the inner tube 43.

When the outer tube 44 is coupled to the support 45, a fan-shaped shape is formed between each convex part 52 in the circumferential direction of the support 45, and an air passage between the inner tube 43 and the outer tube 44 is communicated. A communication hole is formed to allow air to pass through.

Japanese Patent Publication No. 2017-82728

However, in the above-mentioned conventional double pipe structure Pu, when the outer pipe 44 is coupled to the supports 45 disposed at multiple locations of the inner pipe 43, it is necessary to adjust the coupling state between the support 45 and the outer pipe 44. Therefore, the work to form a double pipe structure is cumbersome.

In addition, in the conventional double pipe structure Pu, rings 46 and 47 are required to position the support 45 with respect to the inner pipe 43, and the rings 46 and 47 are attached to the inner pipe with adhesive 48. (43), making the work to form a double pipe structure more cumbersome as it needs to be bonded.

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

For this purpose, the double pipe structure of the present invention has an inner pipe and an outer pipe, a first flow path is formed within the inner pipe for passing the first fluid, and a second passage is formed between the inner pipe and the outer pipe for passing the second fluid. It is made as much as possible.

It is made of an annular body integrally formed of resin, and has a support ring disposed surrounding the inner tube, and a retainer attached to a predetermined location on the outer tube to hold the support ring.

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

It is made of an annular body integrally formed of resin, and has a support ring disposed surrounding the inner tube, and a retainer attached to a predetermined location on the outer tube to hold the support ring.

In this case, a retainer is attached to a predetermined location on the exterior and the support ring is maintained by the retainer, so there is no need to couple the exterior to the support ring and there is no need to adjust the coupling state between the support ring and the exterior.

Additionally, the support ring can be positioned relative to the inner tube simply by attaching a retainer to the outer tube.

Therefore, the work to form a double pipe structure can be simplified.

1 is a perspective view of a double pipe structure in an embodiment of the present invention.
Figure 2 is a perspective view of a support disposed in a conventional double pipe structure.
Figure 3 is a diagram for explaining the vertical assembly sequence of a conventional double pipe structure.
Figure 4 is a conceptual diagram of the main parts of a ship equipped with a double pipe structure in an embodiment of the present invention.
Figure 5 is a longitudinal cross-sectional view of a double pipe structure in an embodiment of the present invention.
Figure 6 is a cross-sectional view of a double pipe structure in an embodiment of the present invention.
Figure 7 is a perspective view of a support ring in an embodiment of the present invention.
Figure 8 is a perspective view of a holding body in an embodiment of the present invention.
Fig. 9 is a diagram showing the state in which the holding body is attached to the support ring in the embodiment of the present invention.
Figure 10 is a perspective view showing a support unit in an embodiment of the present invention.
Fig. 11 is a perspective view of a double pipe structure in which a support unit is incorporated according to an embodiment of the present invention.
Figure 12 is a longitudinal cross-sectional view of the double pipe structure in the state in which the support unit is incorporated in the embodiment of the present invention.
Fig. 13 is a cross-sectional view of the double pipe structure with the support unit incorporated in the embodiment of the present invention.
Figure 14 is a first diagram for explaining the method of forming a double pipe structure in an embodiment of the present invention.
Figure 15 is a second diagram for explaining the method of forming a double pipe structure in an embodiment of the present invention.
Figure 16 is a third diagram for explaining the method of forming a double pipe structure in an embodiment of the present invention.
Figure 17 is a fourth diagram for explaining the method of forming a double pipe structure in an embodiment of the present invention.
Figure 18 is a fifth diagram for explaining the method of forming a double pipe structure in 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, the double pipe structure in the engine room where the gas engine is accommodated, its forming method, and the support unit as a pipe support member will be described.

Figure 4 is a conceptual diagram of the main parts of a ship equipped with a double pipe structure in an 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 relevant machinery space (Aru) is the gas safety machinery space (Ar1) as the first zone and the ESD (emergency shutoff device) as the second zone. It consists of a protective agency area (Ar2). And the gas safety engine area Ar1 is used as an engine room where a gas engine 22 is placed. The ESD protection machinery area (Ar2) includes a bunker unit (25) for supplying liquefied natural gas to the ship, a tank (26) for storing liquefied natural gas, a heat exchanger (28), and a blower (31) as a ventilation device. It is placed.

In addition, an air intake port 33, an air outlet 34, and an opening/closing valve 35 are disposed outside the machinery space Aru, and a fuel line connecting the tank 26 and the gas engine 22 within the engine space Aru ( L1) and ventilation lines (L2, L3) connecting the air intake port 33 and the air outlet 34 are disposed, and the fuel line L1 extends from the gas safety engine area Ar1 to the ESD protection engine area Ar2. ) and the ventilation line (L3) form a double pipe structure (Pu).

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

Fuel gas is the first fluid and flows through the fuel line (L1), which is a fuel gas pipe, and is sent to the gas engine (22). After the gas engine (22) is driven, it is discharged out of the ship through an exhaust gas line (not shown). do.

However, in ships, considering the case when fuel gas leaks out of the fuel line (L1), the inner pipe (43) as the first element formed by the fuel line (L1) is connected to the ventilation line (L3), which is a separate structure. The above-mentioned double pipe structure Pu is formed by surrounding it with the outer pipe 44 as the second element member, and the air as the second fluid sucked from outside the machinery space Aru is formed between the inner pipe 43 and the outer pipe 44. It is supplied between the pipes and discharged out of the engine area (Aru).

For this purpose, the ventilation line (L2) for intake is disposed between the air intake port 33 and the gas engine 22, and the ventilation line for exhaust is disposed between the gas engine 22 and the air outlet 34. (L3) is disposed, and the air sucked from outside the machinery space (Aru) through the air intake port (33) flows through the ventilation line (L2) and is sent to the gas engine (22), and is heated within the gas engine (22). Afterwards, it flows between the outer pipe 44 and the inner pipe 43, is sent from the gas safety machinery area Ar1 to the ESD protection machinery area Ar2, and then is separated from the fuel line L1 and the ventilation line L3. flows to the blower (31) and is discharged out of the machinery space (Aru) through the air outlet (34).

Therefore, since negative pressure is created by the blower 31 in the ventilation lines (L2, L3), even if the fuel gas leaks from the inner pipe (43), the fuel gas does not come out of the outer pipe (44) but is sucked in by the blower (31) and enters the engine. It is discharged outside the area (Aru).

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

Next, the double pipe structure Pu will be described.

1 is a perspective view of a double pipe structure in an embodiment of the present invention, FIG. 5 is a longitudinal cross-sectional view of a double pipe structure in an embodiment of the present invention, and FIG. 6 is a cross-sectional view of a double pipe structure in an embodiment of the present invention. 7 is a perspective view of the support ring in the embodiment of the present invention, Figure 8 is a perspective view of the retainer in the embodiment of the present invention, and Figure 9 is a view of attaching the retainer to the support ring in the embodiment of the present invention. A drawing showing the state, FIG. 10 is a perspective view showing a support unit in an embodiment of the present invention, FIG. 11 is a perspective view of a double pipe structure in a state in which a support unit is incorporated in an embodiment of the present invention, and FIG. 12 is a perspective view showing the support unit in an embodiment of the present invention. Fig. 13 is a longitudinal cross-sectional view of the double pipe structure with the support unit incorporated in the embodiment of the present invention. Fig. 13 is a cross-sectional view of the double pipe structure with the support unit incorporated in the embodiment of the present invention.

In the drawing, Pu is a double pipe structure, and the double pipe structure (Pu) is arranged by connecting a plurality of flanges (not shown) arranged at necessary locations in the machinery space (Aru) to piping the double pipe structure (Pu), and the inner pipe It consists of an exterior (44) arranged to surround (43) and the corresponding inner pipe (43).

The inner pipe 43 and the outer pipe 44 are made of a metal material, in this embodiment, by cutting a pipe member made of stainless steel to a predetermined length and performing bending processing as necessary when piping the double pipe structure Pu. is formed

In addition, each of the flanges is made of a metal material, in this embodiment, stainless steel, and is made of a plate member having a predetermined shape, in this embodiment, a disk shape, and has an inner tube 43 and an outer tube 44 on both sides. An inner pipe connection part and an outer pipe connection part are formed for connection.

Both ends of the inner tube 43 are fixed so that the inside and outside of the inner tube 43 are sealed by welding at the inner tube connector formed on each flange, and both ends of the outer tube 44 are welded to the outer tube connection part formed on each flange. 44) is fixed so that the inside and outside are sealed, and the gas flow path Rt1 as the first flow path having a circular cross-sectional shape within the inner tube 43 has a ring-shaped cross-sectional shape between the inner tube 43 and the outer tube 44. In the branch, an air flow path (Rt2) is formed as a second flow path. In addition, the flange communicates the gas flow path (Rt1) on the upstream and downstream sides between the inner pipe connection part and the outer pipe connection part, and a plurality of fuel gas holes (not shown) are formed for passing fuel gas, and are formed in the radial direction from the outer pipe connection part. The air flow path Rt2 on the upstream side and the downstream side is communicated to the outside, and a plurality of air holes (not shown) for allowing air to pass through are formed.

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

The support unit 61 is arranged to surround the inner tube 43, and in the circumferential direction of the support ring 63 as a tube support annular body made of a resin material, in this embodiment, a fluoropolymer, and the outer tube 44. At predetermined locations, in the present embodiment, it is attached by welding to the upper and lower ends of the outer pipe 44, holds the support ring 63 in the longitudinal direction of the double pipe structure Pu, and is positioned with respect to the inner pipe 43. It consists of a pair of holding bodies 65 and 66 as positioning members.

The support ring 63 is made of an annular body formed of a resin material, in this embodiment, a fluororesin by a molding method such as injection molding, and has an inner diameter slightly larger than the outer diameter of the inner tube 43 so that it can be coupled to the inner tube 43. has In addition, so that the support ring 63 can be positioned by the retainers 65 and 66, as shown in FIG. 7, the outer peripheral surface S1 of the support ring 63 is aligned in the width direction (longitudinal direction of the inner tube 43). A groove m1 having a predetermined width and a predetermined depth and an annular shape is formed in the entire circumferential direction in the central portion of the groove.

In this embodiment, the support ring 63 is made of fluorocarbon resin with high wear resistance, heat resistance, and weather resistance, so the support ring 63 is not deformed even if the double pipe structure (Pu) is used over a long period of time, so the support unit ( 61) can improve durability.

The holding bodies 65 and 66 are formed by subjecting a steel material made of a metal material, in this embodiment, stainless steel, to press processing, etc., and have a "two-pane" shape as shown in FIG. 8. have In addition, it has a cylindrical shape, a post 68 for attaching the retainers 65, 66 to the exterior 44, and is integrated with the post 68 and branches left and right from one end of the post 68 and has a “U” The retainers 65 and 66 are provided with a support retainer 69 that is curved into a “shape” (semicircular shape).

To enable the support holding portion 69 to enter the groove m1, the radius of curvature of the inner peripheral surface of the support holding portion 69 is slightly larger than the radius of curvature of the outer peripheral surface of the groove m1.

And, for example, as shown in FIG. 9, the support holding portion 69 is entered into the groove m1 of the support ring 63, and the retainers 65 and 66 are attached to the support ring 63, as shown in FIG. 10. As shown, a support unit 61 is formed.

In order to attach the support unit 61 to the upper and lower ends of the outer shell 44 at the support arrangement position St1, a hole h1 is formed at a pitch angle of 180 [°] at the upper and lower ends of the outer shell 44. This is formed. The inner diameter of the hole (h1) is slightly larger than the outer diameter of the post (68) so that the post (68) can be coupled to each hole (h1).

With each post 68 coupled to each hole h1, the holding bodies 65 and 66 are moved radially outward within the outer tube 44, and then the support ring coupled to the inner tube 43 ( 63) is inserted between the retainers 65 and 66, and the retainers 65 and 66 are moved radially inward to cause the support retainer 69 to enter the groove m1 of the support ring 63, When the support ring 63 and the support holding portion 69 are joined together, the support unit 61 is incorporated into the double pipe structure Pu, as shown in FIG. 11.

Subsequently, by welding the outer peripheral surface of the post 68 and the inner peripheral surface of the hole h1 to seal the inside and outside of the exterior 44, the support unit 61 is attached to the double pipe structure Pu.

In addition, when the support unit 61 is attached to the double pipe structure Pu, as shown in FIGS. 11 to 13, the posts 68 of the retainers 65 and 66 extend radially outward from the upper and lower ends of the exterior 44. protrudes toward.

Therefore, after the support unit 61 is assembled to the double pipe structure Pu, the parts protruding from the upper and lower ends of the outer shell 44, which is the other end of the post 68, are cut and removed using a cutter, etc., not shown. As a result, a double pipe structure Pu as shown in FIGS. 1, 5, and 6 is formed.

In the drawing, Sb is a cut surface when the post 68 is cut, and Pt1 is a weld metal portion formed between the outer peripheral surface of the post 68 and the inner peripheral surface of the hole h1.

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

FIG. 14 is a first view for explaining a method of forming a double pipe structure in an embodiment of the present invention, FIG. 15 is a second view for explaining a method of forming a double pipe structure in an embodiment of the present invention, and FIG. 16 is a third view for explaining the method of forming a double pipe structure in an embodiment of the present invention, Figure 17 is a fourth view for explaining a method for forming a double pipe structure in an embodiment of the present invention, and Figure 18 is a view showing the method of forming a double pipe structure in an embodiment of the present invention. This is a fifth diagram for explaining the method of forming a double pipe structure in an embodiment of the invention.

First, as shown in FIG. 14, the inner tube 43 and the outer tube 44 are formed by cutting the pipe member to a predetermined length, the support ring 63 is formed by injection molding, etc., and the retainers 65 and 66 are formed by press processing, etc. is formed As described above, holes h1 for penetrating the posts 68 of the holding bodies 65 and 66 are formed at the upper and lower ends of the outer shell 44 at the support arrangement position St1.

Next, as shown in FIG. 15, the holding bodies 65 and 66 are inserted into the outer shell 44 from a predetermined end eg1 of the outer shell 44, and each post 68 is inserted into a hole ( h1).

Subsequently, as shown in FIG. 16, the holding bodies 65 and 66 are moved radially outward within the outer shell 44, the post 68 protrudes from the hole h1 by a sufficient amount, and the support holding portion 69 ) approaches the inner peripheral surface of the exterior 44, and the inner tube 43 to which the support ring 63 is coupled enters the exterior 44.

Next, the retainers 65 and 66 are moved radially inward, and the support retainer 69 enters the above-mentioned groove m1 (FIG. 7) of the support ring 63 to form the support ring 63 and the support. When the holding portion 69 is coupled, the support unit 61 is formed at the support arrangement position St1 of the double pipe structure Pu, as shown in FIG. 17. Then, the outer peripheral surface of the post 68 and the inner peripheral surface of the hole h1 are welded by the welding device 71.

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

In this way, in the present embodiment, the retainers 65 and 66 are attached to predetermined positions on the exterior 44, and the support ring 63 is held by the retainers 65 and 66, so that the support ring 63 Since there is no need to couple the exterior 44, there is no need to adjust the coupling state between the support ring 63 and the exterior 44.

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

Therefore, the work to form the double pipe structure (Pu) can be simplified.

In addition, the support holding portion 69 of the holding bodies 65 and 66 maintains the support ring 63 near the outer peripheral surface of the inner tube 43, so that air is maintained between the support holding portion 69 and the inner peripheral surface of the outer peripheral surface 44. A space of sufficient width is formed to communicate the upstream side and the downstream side of the flow path Rt2. Therefore, the air flow is not impeded by the support unit 61.

Additionally, the present invention is not limited to the above-described embodiments, 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: Exterior
63: support ring 65, 66: retainer
Pu: Double pipe structure Rt1: Gas flow path
Rt2: Air flow path

Claims (6)

In a double pipe structure having an inner tube and an outer tube, a first flow path for passing a first fluid is formed within the inner tube, and a second flow path for passing a second fluid is formed between the inner tube and the outer tube,
(a) a support ring made of an annular body integrally formed of resin and disposed surrounding the inner tube,
(b) A double pipe structure characterized by having a retainer attached to a predetermined location on the exterior and holding the support ring. In claim 1,
The holding body is a double pipe structure including a post attached to the exterior and a support holding part formed by branching from one end of the post. In claim 2,
(a) The support ring has a groove having an annular shape,
(b) A double pipe structure in which the support holding portion is formed by bending and enters the groove to maintain the support ring. The method according to any one of claims 1 to 3,
(a) the exterior has holes formed through the inside and outside of the exterior at the predetermined locations,
(b) A double pipe structure in which the holding body is attached to the exterior by welding the outer peripheral surface of the post and the inner peripheral surface of the hole. (a) Inserting a retainer with a post and support retainer into the exterior,
(b) Passing a post through a hole formed at a predetermined location on the exterior, moving the holding body outward in the radial direction, and inserting the inner tube to which the support ring is coupled into the exterior,
(c) A method of forming a double pipe structure, characterized in that the support holding part and the support ring are coupled by moving the holding body radially inward. A pipe support member disposed in a double pipe structure having an inner pipe and an outer pipe, a first flow path for passing a first fluid inside the inner pipe, and a second flow path for passing a second fluid between the inner pipe and the outer pipe. In
(a) a support ring made of an annular body integrally formed of resin and disposed surrounding the inner tube,
(b) A pipe support member comprising a post, and a holding body formed by branching from one end of the post and having a support holding portion for holding the support ring.

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