Double-pipe structure, method for forming the same, and pipe support member

Abstract

The present invention relates to a double pipe structure, a method for forming the same, and a pipe support member. The operation for forming the double pipe structure can be simplified. The double pipe structure has an inner pipe (43) and an outer pipe (44), a first flow path for a first fluid is formed in the inner pipe (43), and a second flow path for a second fluid is formed between the inner pipe (43) and the outer pipe (44). The double pipe structure has a support ring (63) composed of a ring-shaped body integrally formed by using a resin, which is arranged so as to surround the inner pipe (43), and a holding body (65, 66) mounted to the outer pipe (44) and holding the support ring (63). The holding body is mounted at a predetermined position in the length direction of the outer pipe (44), and the support ring (63) is held by the holding body (65, 66), so that the outer pipe (44) does not need to be fitted over the support ring (63), and the fitting between the support ring (63) and the outer pipe (44) does not need to be adjusted.

Description

Technical Field

[0001] The present invention relates to a double-tube structure, a method of forming the same, and a tube support member. Background Technology

[0002] Previously, for ships that use liquefied natural gas (LNG) as fuel to power gas engines, the IGC Code (International Code for the Construction and Equipment of Ships Carrying Liquefied Gas in Bulk) and the IGF Code (International Regulations for the Safety of Ships Using Gas or Other Low-Flash-Point Fuels) stipulated that the engine room housing the gas engine should be located in a gas-safe machinery space. For engine rooms designed according to this regulation, considering the possibility of fuel gas leakage, a double-pipe structure is constructed by surrounding the fuel lines supplying the fuel gas and the machinery in contact with the fuel gas with other structures. Furthermore, the interior of the double-pipe structure is constantly ventilated (see, for example, Patent Document 1).

[0003] In the double-tube structure, a fuel gas flow path is formed inside the inner tube, and an annular air flow path for ventilation is formed between the inner and outer tubes. A support member, which serves as a tube support member, is provided at a predetermined position in the length direction to maintain the cross-sectional area of ​​the air flow path at a certain value.

[0004] Figure 2 This is a perspective view of the support components installed in the conventional double-tube structure. Figure 3 This diagram illustrates the longitudinal assembly steps of a conventional double-tube structure.

[0005] In the accompanying drawings, reference numeral Pu is a double-tube structure, reference numeral 43 is an inner tube, reference numeral 44 is an outer tube, reference numeral 45 is a support member that surrounds and supports the inner tube 43 as a tube support member, and reference numerals 46 and 47 are rings that serve as positioning members. These rings are fitted over the inner tube 43 at one end and the other end of the double-tube structure Pu and are abutted against the support member 45 to position the support member 45 relative to the inner tube 43.

[0006] The support member 45 is integrally formed by cutting a cylindrical component made of fluororesin using molding methods such as injection molding to a predetermined length and then machining it, and has a ring-shaped shape.

[0007] The rings 46 and 47 are made of stainless steel and have an inner diameter slightly larger than the outer diameter of the inner tube 43, so that they can be slidably fitted onto the inner tube 43.

[0008] Ring 46 is bonded and fixed to inner tube 43 by means of resin adhesive 48 applied to edge eg1, and ring 47 is bonded and fixed to inner tube 43 by means of adhesive 48 applied to edge eg2.

[0009] Furthermore, the support member 45 is composed of an annular body, including an annular portion 51 and a protrusion 52, which protrudes radially outward at multiple locations (four locations in this embodiment) in the circumferential direction of the support member 45. Additionally, the inner diameter of the annular portion 51 is slightly larger than the outer diameter of the inner tube 43, allowing the support member 45 to slide and fit over the inner tube 43.

[0010] When the outer tube 44 is sleeved on the support member 45, a connecting hole is formed between each of the protrusions 52 in the circumferential direction of the support member 45. The connecting hole has a fan-shaped shape and is used to connect the air flow path between the inner tube 43 and the outer tube 44 to allow air to flow.

[0011] Existing technical documents

[0012] Patent documents

[0013] Patent Document 1: Japanese Patent Application Publication No. 2017-82728 Summary of the Invention

[0014] The problem the invention aims to solve

[0015] However, in the conventional double-tube structure Pu, when the outer tube 44 is fitted onto the support members 45 provided at multiple locations on the inner tube 43, it is necessary to adjust the fit between the support members 45 and the outer tube 44, making the operation to form the double-tube structure more complicated.

[0016] In addition, in the conventional double-tube structure Pu, rings 46 and 47 are required to position the support 45 relative to the inner tube 43, and the rings 46 and 47 need to be bonded to the inner tube 43 using adhesive 48, making the process of forming the double-tube structure more complicated.

[0017] The purpose of this invention is to address the problems of the conventional double-tube structure Pu, and to provide a double-tube structure, a method for forming the double-tube structure, and a tube support member that simplifies the process of forming the double-tube structure.

[0018] Solution for solving the problem

[0019] Therefore, the dual-tube structure of the present invention includes an inner tube and an outer tube, a first flow path for the flow of a first fluid is formed in the inner tube, and a second flow path for the flow of a second fluid is formed between the inner tube and the outer tube.

[0020] Furthermore, the double-tube structure has: a support ring, which is formed integrally from a ring-shaped body using resin, the support ring being disposed around the inner tube; and a retainer, which is installed at a predetermined position on the outer tube to retain the support ring.

[0021] The effects of the invention

[0022] According to the present invention, the double-tube structure includes an inner tube and an outer tube, a first flow path for the flow of a first fluid is formed in the inner tube, and a second flow path for the flow of a second fluid is formed between the inner tube and the outer tube.

[0023] Furthermore, the double-tube structure has: a support ring, which is formed integrally from a ring-shaped body using resin, the support ring being disposed around the inner tube; and a retainer, which is installed at a predetermined position on the outer tube to retain the support ring.

[0024] In this case, a retainer is installed at a predetermined position on the outer tube to hold the support ring. Therefore, it is not necessary to cover the support ring with an outer tube, and it is not necessary to adjust the fit between the support ring and the outer tube.

[0025] In addition, the support ring can be positioned relative to the inner tube simply by installing a retainer on the outer tube.

[0026] Therefore, it simplifies the process of forming double-tube structures. Attached Figure Description

[0027] Figure 1 This is a perspective view of a double-tube structure according to an embodiment of the present invention.

[0028] Figure 2 This is a perspective view of the support component installed in the conventional double-tube structure.

[0029] Figure 3 This diagram illustrates the longitudinal assembly steps of a conventional double-tube structure.

[0030] Figure 4 This is a schematic diagram of the main parts of a ship equipped with a double-tube structure according to an embodiment of the present invention.

[0031] Figure 5 This is a longitudinal sectional view of a double-tube structure according to an embodiment of the present invention.

[0032] Figure 6 This is a cross-sectional view of a double-tube structure according to an embodiment of the present invention.

[0033] Figure 7 This is a perspective view of the support ring according to an embodiment of the present invention.

[0034] Figure 8 This is a perspective view of the retainer according to an embodiment of the present invention.

[0035] Figure 9 This is a diagram showing the state of the support ring mounting retainer according to an embodiment of the present invention.

[0036] Figure 10 This is a perspective view showing the support unit according to an embodiment of the present invention.

[0037] Figure 11 This is a perspective view of a double-tube structure assembled with support units according to an embodiment of the present invention.

[0038] Figure 12 This is a longitudinal sectional view of a double-tube structure assembled with support units according to an embodiment of the present invention.

[0039] Figure 13 This is a cross-sectional view of a double-tube structure assembled with support units according to an embodiment of the present invention.

[0040] Figure 14 Figure 1 is a diagram illustrating the method for forming a double-tube structure according to an embodiment of the present invention.

[0041] Figure 15 Figure 2 is a diagram illustrating the method for forming a double-tube structure according to an embodiment of the present invention.

[0042] Figure 16 Figure 3 is a diagram illustrating the method for forming a double-tube structure according to an embodiment of the present invention.

[0043] Figure 17 Figure 4 is the fourth figure used to illustrate the method of forming a double-tube structure according to an embodiment of the present invention.

[0044] Figure 18 Figure 5 illustrates the method for forming a double-tube structure according to an embodiment of the present invention.

[0045] Explanation of reference numerals in the attached figures

[0046] 43. Inner tube; 44. Outer tube; 63. Support ring; 65, 66. Retainer; Pu, Double tube structure; Rt1, Gas flow path; Rt2, Air flow path. Detailed Implementation

[0047] The following is a reference to the appendix. Figure 1 The embodiments of the present invention will be described in detail below. In this case, a double-pipe structure in an engine compartment housing a gas turbine engine, its formation method, and a support unit serving as a pipe support member will be described.

[0048] Figure 4 This is a schematic diagram of the main parts of a ship equipped with a double-tube structure according to an embodiment of the present invention.

[0049] In the accompanying drawings, reference numeral Aru indicates a machinery space formed in accordance with the IGF Code at a predetermined location on the ship. This machinery space Aru includes a gas safety machinery space Ar1, which is designated as Zone 1, and an ESD (Emergency Shutdown Device) protection machinery space Ar2, which is designated as Zone 2. Furthermore, the gas safety machinery space Ar1 is equipped with a gas turbine engine 22, serving as an engine room. The ESD protection machinery space Ar2 is equipped with a fuel tank unit 25 for supplying liquefied natural gas to the ship, a tank 26 for containing liquefied natural gas, a heat exchanger 28, a blower 31 as a ventilation device, etc.

[0050] In addition, an air inlet 33, an air outlet 34, and an on / off valve 35 are provided outside the machine space Aru. A fuel line L1 connecting the tank 26 and the gas engine 22, and ventilation lines L2 and L3 connecting the air inlet 33 and the air outlet 34 are provided inside the machine space Aru. A double pipe structure Pu is formed by the fuel line L1 and the ventilation line L3 from the gas safety machine space Ar1 to the ESD protection machine space Ar2.

[0051] The liquefied natural gas supplied to the ship from outside the machine space Aru via the fuel tank unit 25 is contained in tank 26 and then delivered to heat exchanger 28 in the amount required to drive the gas engine 22. In heat exchanger 28, it is heated by warm water and vaporized into fuel gas at a predetermined temperature, for example, around 40 °C.

[0052] Fuel gas, as the first fluid, flows through the fuel line L1, which is a piping for fuel gas, and is delivered to the gas engine 22. After driving the gas engine 22, it is discharged to the outside of the ship via an exhaust line (not shown).

[0053] However, for ships, considering the possibility of fuel gas leaking outside the fuel line L1, the double-pipe structure Pu is formed by surrounding the inner pipe 43, which is the first element component formed by the fuel line L1, with the outer pipe 44, which is the second element component formed by the ventilation line L3, which is another structure. Air, which is the second fluid, is supplied from outside the machine space Aru to the space between the inner pipe 43 and the outer pipe 44 and discharged outside the machine space Aru.

[0054] For this purpose, an air intake ventilation line L2 is provided between the air inlet 33 and the gas engine 22, and an exhaust ventilation line L3 is provided between the gas engine 22 and the air outlet 34. Air supplied from outside the machine space Aru through the air inlet 33 flows through the ventilation line L2 and is delivered to the gas engine 22. After being heated inside the gas engine 22, it flows between the outer pipe 44 and the inner pipe 43 and is delivered from the gas safety machine space Ar1 to the ESD protection machine space Ar2. Then, it separates from the fuel line L1 and flows through the ventilation line L3 to the blower 31, and is released from the air outlet 34 to outside the machine space Aru.

[0055] Therefore, since a negative pressure is created in the ventilation lines L2 and L3 by the blower 31, even if the fuel gas leaks from the inner pipe 43, the fuel gas will not be discharged to the outer pipe 44, but will be drawn by the blower 31 and discharged to the machine location Aru.

[0056] Furthermore, for convenience, the inner tube 43 and the outer tube 44 are shown adjacent to each other in the accompanying drawings.

[0057] Next, the double-tube structure Pu will be described.

[0058] Figure 1 This is a perspective view of a double-tube structure according to an embodiment of the present invention. Figure 5 This is a longitudinal sectional view of a double-tube structure according to an embodiment of the present invention. Figure 6 This is a cross-sectional view of the double-tube structure according to an embodiment of the present invention. Figure 7 This is a perspective view of the support ring according to an embodiment of the present invention. Figure 8 This is a perspective view of the retainer according to an embodiment of the present invention. Figure 9 This diagram shows the state in which the support ring retainer is mounted according to an embodiment of the present invention. Figure 10 This is a perspective view showing the support unit according to an embodiment of the present invention. Figure 11 This is a perspective view of a double-tube structure assembled with support units according to an embodiment of the present invention. Figure 12 This is a longitudinal sectional view of a double-tube structure assembled with support units according to an embodiment of the present invention. Figure 13 This is a cross-sectional view of a double-tube structure assembled with support units according to an embodiment of the present invention.

[0059] In the accompanying drawings, reference numeral Pu is a double-tube structure Pu which is connected between a plurality of flanges (not shown) provided at necessary locations within the machine location Aru for piping the double-tube structure Pu, the double-tube structure Pu including an inner tube 43 and an outer tube 44 disposed surrounding the inner tube 43.

[0060] Both the inner tube 43 and the outer tube 44 are formed by cutting the tube component, which is made of metal material, or stainless steel in this embodiment, to a predetermined length, and bending it as needed when piping the double tube structure Pu.

[0061] In addition, each flange is made of a metal material, specifically stainless steel in this embodiment, and is composed of a plate member having a predetermined shape, specifically a circular plate shape in this embodiment. An inner tube connecting portion for connecting the inner tube 43 and an outer tube connecting portion for connecting the outer tube 44 are formed on both sides of each flange.

[0062] The inner tube 43 is fixed at both ends by welding to seal the inner and outer sides of the inner tube 43 to the inner tube connection portion formed on each flange. The outer tube 44 is fixed at both ends by welding to seal the inner and outer sides of the outer tube 44 to the outer tube connection portion formed on each flange. A gas flow path Rt1 with a circular cross-sectional shape, serving as a first flow path, is formed inside the inner tube 43. An air flow path Rt2 with an annular cross-sectional shape, serving as a second flow path, is formed between the inner tube 43 and the outer tube 44. Furthermore, on the flange, a plurality of fuel gas holes (not shown) are formed between the inner tube connection portion and the outer tube connection portion to allow fuel gas to flow through by connecting the upstream and downstream gas flow paths Rt1. A plurality of air holes (not shown) are formed penetratingly outside the outer tube connection portion to allow air to flow through by connecting the upstream and downstream air flow paths Rt2.

[0063] Support member mounting positions St1 are provided at predetermined locations along the length of the double-tube structure Pu. Each support member mounting position St1 is provided with a support unit 61, which serves as a tube support member, and the inner tube 43 is supported by the support unit 61.

[0064] The support unit 61 includes: a support ring 63, which serves as a tube support ring and is disposed around the inner tube 43, the support ring 63 being made of resin material, in this embodiment fluororesin; and a pair of retainers 65, 66, which serve as positioning members and are welded to predetermined locations in the circumferential direction of the outer tube 44, in this embodiment the upper end and lower end of the outer tube 44, to retain the support ring 63 and position it relative to the inner tube 43 in the length direction of the double tube structure Pu.

[0065] The support ring 63 is composed of a ring-shaped body formed from a resin material (in this embodiment, fluororesin) using a molding method such as injection molding. The support ring 63 has an inner diameter slightly larger than the outer diameter of the inner tube 43, allowing it to fit over the inner tube 43. Additionally, as... Figure 7As shown, a groove m1 with a predetermined width and a predetermined depth and an annular shape is formed in the central part of the outer peripheral surface S1 of the support ring 63 in the width direction (length direction of the inner tube 43) throughout the entire circumference, so that the support ring 63 can be positioned by means of the retaining bodies 65 and 66.

[0066] In this embodiment, the support ring 63 is made of fluororesin with high wear resistance, heat resistance and weather resistance. Therefore, even if the double tube structure Pu is used for a long time, the support ring 63 will not deform, thus improving the durability of the support unit 61.

[0067] The retainers 65 and 66 are formed by stamping or other processes on a metal material, which in this embodiment is stainless steel. Figure 8 As shown, it has a "steel fork" shape. In addition, the retainers 65 and 66 include: a column portion 68, which has a cylindrical shape, for mounting the retainers 65 and 66 to the outer tube 44; and a support member retaining portion 69, which is integral with the column portion 68 and branches to the left and right from one end of the column portion 68, and is formed by bending in the shape of the letter "U" (semi-circular shape).

[0068] The radius of curvature of the inner circumferential surface of the support member retaining part 69 is slightly larger than the radius of curvature of the outer circumferential surface of the groove m1, so that the support member retaining part 69 can enter the groove m1.

[0069] Thus, for example, in such Figure 9 When the support member retaining part 69 is inserted into the groove m1 of the support ring 63 as shown, and the retainers 65 and 66 are installed on the support ring 63, as shown... Figure 10 The support unit 61 is formed as shown.

[0070] At the support member mounting position St1, holes h1 are formed at 180° intervals at the upper and lower ends of the outer tube 44 to mount the support unit 61 to the upper and lower ends of the outer tube 44. The inner diameter of the hole h1 is slightly larger than the outer diameter of the column 68 so that the column 68 can be fitted into each hole h1.

[0071] With each column 68 embedded in each hole h1, the retaining bodies 65 and 66 are moved radially outward within the outer tube 44. Then, the support ring 63, which is fitted over the inner tube 43, is inserted between the retaining bodies 65 and 66. The retaining bodies 65 and 66 are moved radially inward, causing the support member retaining part 69 to enter the groove m1 of the support ring 63, thus engaging the support ring 63 with the support member retaining part 69. Therefore, as... Figure 11 As shown, support unit 61 is assembled in the double-tube structure Pu.

[0072] Next, by welding the outer peripheral surface of the column 68 to the inner peripheral surface of the hole h1 to seal the inner and outer surfaces of the outer tube 44, the support unit 61 is installed on the double tube structure Pu.

[0073] Furthermore, if the support unit 61 is installed on the double-tube structure Pu, then as Figures 11-13 As shown, the column portion 68 of the retaining bodies 65 and 66 protrudes radially outward from the upper and lower ends of the outer tube 44.

[0074] Therefore, after the support unit 61 is assembled into the double-tube structure Pu, the other end of the column 68, i.e., the portion protruding from the upper and lower ends of the outer tube 44, is cut off and removed using a cutter (not shown). This results in a structure as follows: Figure 1 , Figure 5 as well as Figure 6 The double-tube structure Pu is shown.

[0075] Additionally, in the accompanying drawings, reference numeral Sb represents the cut surface when the column 68 is cut off, and reference numeral Pt1 represents the welded metal portion formed between the outer peripheral surface of the column 68 and the inner peripheral surface of the hole h1.

[0076] Next, the method for forming the double-tube structure Pu will be explained.

[0077] Figure 14 Figure 1 is a diagram illustrating the method for forming a double-tube structure according to an embodiment of the present invention. Figure 15 Figure 2 is a diagram illustrating the method for forming a double-tube structure according to an embodiment of the present invention. Figure 16 Figure 3 is the third figure used to illustrate the method of forming a double-tube structure according to an embodiment of the present invention. Figure 17 Figure 4 is the fourth figure used to illustrate the method of forming a double-tube structure according to an embodiment of the present invention. Figure 18 Figure 5 illustrates the method for forming a double-tube structure according to an embodiment of the present invention.

[0078] First, such as Figure 14 As shown, the inner tube 43 and the outer tube 44 are formed by cutting the tube components to a predetermined length, the support ring 63 is formed by injection molding or the like, and the retainers 65 and 66 are formed by stamping or the like. As described above, holes h1 are formed at the upper and lower ends of the outer tube 44 at the support member mounting position St1, through which the column portions 68 of the retainers 65 and 66 pass.

[0079] Next, as Figure 15 As shown, retainers 65 and 66 are inserted into the outer tube 44 from the predetermined end eg1, and each column portion 68 is made to pass through the hole h1 inside the outer tube 44.

[0080] Next, as Figure 16As shown, the retainers 65 and 66 are moved radially outward within the outer tube 44, causing the column portion 68 to protrude sufficiently from the hole h1, and the support retainer portion 69 to approach the inner circumferential surface of the outer tube 44, so that the inner tube 43, which is fitted with the support ring 63, enters the outer tube 44.

[0081] Next, the retainers 65 and 66 are moved radially inward, causing the support retainer 69 to enter the aforementioned groove m1 of the support ring 63. Figure 7 This causes the support ring 63 to engage with the support member retaining part 69, thus, as... Figure 17 As shown, a support unit 61 is formed at the support member mounting position St1 of the double-tube structure Pu. Then, the outer peripheral surface of the column 68 is welded to the inner peripheral surface of the hole h1 using a welding device 71.

[0082] Next, the other end of the column 68, namely the portion protruding from the upper and lower ends of the outer tube 44, is cut off and removed using a cutter or the like. This forms... Figure 18 The double-tube structure Pu is shown.

[0083] Thus, in this embodiment, retainers 65 and 66 are installed at predetermined locations on the outer tube 44 to hold the support ring 63. Therefore, it is not necessary to cover the support ring 63 with the outer tube 44, thereby eliminating the need to adjust the fit between the support ring 63 and the outer tube 44.

[0084] In addition, the support ring 63 can be positioned relative to the inner tube 43 simply by installing retainers 65 and 66 on the outer tube 44.

[0085] Therefore, the process of forming the double-tube structure Pu can be simplified.

[0086] Furthermore, the support member holding portion 69 of the retaining bodies 65 and 66 holds the support ring 63 near the outer peripheral surface of the inner tube 43. Therefore, a sufficiently wide space is formed between the support member holding portion 69 and the inner peripheral surface of the outer tube 44, connecting the upstream and downstream sides of the air flow path Rt2. As a result, the air flow is not obstructed by the support unit 61.

[0087] Furthermore, the present invention is not limited to the described embodiments, but various modifications can be made based on the spirit of the present invention, and these modifications are not excluded from the scope of the present invention.

Claims

1. A double-tube structure comprising an inner tube and an outer tube, wherein a first flow path for a first fluid is formed within the inner tube, and a second flow path for a second fluid is formed between the inner and outer tubes, characterized in that, This double-tube structure has: A support ring, which is integrally formed from a ring-shaped body using resin, is disposed around the inner tube; and A retainer, which is installed at a predetermined position on the outer tube, retains the support ring. The retainer includes: a column portion mounted on an outer tube; and two support member retaining portions branching from one end of the column portion, wherein the support ring is retained by engaging the support ring with the two support member retaining portions.

2. The double-tube structure according to claim 1, wherein, The support ring has a groove. The support retainer portion enters the groove to retain the support ring.

3. The double-tube structure according to claim 1, wherein, The outer tube has a hole formed at a predetermined location, penetrating both the inside and outside of the outer tube. The retainer is mounted on the outer tube by welding the outer peripheral surface of the column to the inner peripheral surface of the hole.

4. A method for forming a double-tube structure, characterized in that, In the method for forming the double-tube structure, The retainer, which has a column and a support retainer, is inserted into the outer tube. The column is made to pass through a hole formed at a predetermined location in the outer tube, causing the retainer to move radially outward, and the inner tube, which is fitted with a support ring, is inserted into the outer tube. The retainer is moved radially inward, thereby engaging the retaining portion of the support member with the support ring.

5. A pipe support member disposed in a double-pipe structure, the double-pipe structure having an inner pipe and an outer pipe, a first flow path for a first fluid to flow through the inner pipe being formed therein, and a second flow path for a second fluid to flow through the inner pipe and the outer pipe being formed therein, characterized in that, The pipe support component has the following characteristics: A support ring, which is integrally formed from a ring-shaped body using resin, is disposed around the inner tube; and A retainer having a column portion and two support retaining portions branching from one end of the column portion, wherein the support ring is retained by engaging the support ring with the two support retaining portions.

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