CN113464316B - Double pipe structure and support - Google Patents
Double pipe structure and support Download PDFInfo
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- CN113464316B CN113464316B CN202110118491.XA CN202110118491A CN113464316B CN 113464316 B CN113464316 B CN 113464316B CN 202110118491 A CN202110118491 A CN 202110118491A CN 113464316 B CN113464316 B CN 113464316B
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- support
- inner tube
- pipe
- double
- flow path
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L39/00—Joints or fittings for double-walled or multi-channel pipes or pipe assemblies
- F16L39/005—Joints or fittings for double-walled or multi-channel pipes or pipe assemblies for concentric pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
- F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
- F16L13/10—Adhesive or cemented joints
- F16L13/103—Adhesive joints
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L51/00—Expansion-compensation arrangements for pipe-lines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Combustion & Propulsion (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The present invention relates to a double pipe structure and a support. The double pipe structure can be miniaturized, the cost can be reduced, and the maintenance and management can be easily performed. The double-pipe structure comprises an inner pipe (43) and an outer pipe (44), wherein a 1 st flow path is formed in the inner pipe, and a 2 nd flow path through which a 2 nd fluid flows is formed between the inner pipe and the outer pipe. The double-pipe structure comprises: a support member (55) integrally formed of a resin, having an annular shape, disposed so as to surround the inner tube in the 2 nd flow path, and having a communication hole (71) for the 2 nd fluid to flow between the support member and the outer tube; and positioning members arranged on the upstream side and the downstream side of the support in the flow direction of the 1 st fluid, for sandwiching the support and positioning the support with respect to the inner tube. The double pipe structure can be miniaturized. Since the support is formed of resin, sparks are not generated due to vibration.
Description
Technical Field
The present invention relates to a double pipe structure and a support.
Background
Conventionally, a ship that drives a gas engine using Liquefied Natural Gas (LNG) as a fuel gas to launch is designed based on a regulation such as IGC regulation (international bulk transportation liquefied gas ship structure and facility regulation), IGF regulation (international ship use gas or other low-flash-point fuel safety regulation), and an engine room that accommodates the gas engine is provided at a gas-safe machine place (Gas safe machinery space) according to the regulation. In view of the above, in the engine room, the fuel line, which is a pipe through which the fuel gas flows, the equipment in contact with the fuel gas, and the like are surrounded by other structures, so that the ship forms a double-pipe structure, the inside of which is always ventilated (for example, refer to patent document 1).
In the double tube structure, a fuel gas flow path is formed in an inner tube, an annular ventilation air flow path is formed between the inner tube and an outer tube, the outer tube is supported by the inner tube, and a support member for maintaining a constant cross-sectional area of the air flow path is disposed at a predetermined position in a longitudinal direction.
Fig. 2 is a perspective view of a conventional support member disposed in a double tube structure.
In the drawings, reference numeral 11 is a support, and the support 11 is formed as follows: the pair of holding pieces 13, 14 formed by shaping the metal plate having elasticity are coupled by the bolt-nuts bt1, bt 2.
The holding pieces 13, 14 include: a receiving portion 16 having a semi-cylindrical shape, coupling portions 17, 18 extending radially outward from both edges of the receiving portion 16, and a fin 19 extending circumferentially from a radially outer edge of the coupling portion 17, which is one of the coupling portions 17, 18.
The receiving portions 16 of the holding pieces 13 and 14 are disposed so as to surround an inner tube, not shown, of the double tube structure, the connecting portion 17 of the holding piece 13 and the connecting portion 18 of the holding piece 14 are connected by a bolt-nut bt1, and the connecting portion 18 of the holding piece 13 and the connecting portion 17 of the holding piece 14 are fixed by a bolt-nut bt2, whereby the holding piece 13 and the holding piece 14 can be connected, and the support 11 can be attached to the inner tube.
In this state, the double tube structure can be assembled by fitting the outer tube, not shown, over the support 11 against the biasing force of each fin 19.
In the outer tube, the fins 19 exert a force on the outer tube by the force exerted thereon, and thus the outer tube is supported by the inner tube, and the cross-sectional area of the air flow path is kept constant.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open publication No. 2017-82728
Disclosure of Invention
Problems to be solved by the invention
However, in the conventional double tube structure, the support 11 is formed by connecting the pair of holding pieces 13, 14 with the bolt-nuts bt1, bt2, and thus the double tube structure is enlarged.
Further, in order to prevent spark from being generated by sliding the fins 19 and the inner peripheral surface of the outer tube due to the vibration of the ship or the like by supporting the outer tube by the urging force of the fins 19, it is necessary to sufficiently ground the double tube structure, and the cost of the double tube structure is increased.
In addition, when the double pipe structure is used for a long period of time in a ship or the like, there is a possibility that the support 11 is corroded by rust or the like, and maintenance and management of the double pipe structure are complicated.
The present invention has an object to solve the problems of the conventional double tube structure and to provide a double tube structure and a support member which can be miniaturized, can reduce the cost, and can be easily maintained and managed.
Solution for solving the problem
The double-pipe structure of the present invention includes an inner pipe and an outer pipe, wherein a 1 st flow path through which a 1 st fluid flows is formed in the inner pipe, and a 2 nd flow path through which a 2 nd fluid flows is formed between the inner pipe and the outer pipe.
The double-pipe structure further comprises: a support member integrally formed of a resin and having an annular shape, the support member being disposed so as to surround the inner pipe in the 2 nd flow path, and a communication hole through which the 2 nd fluid flows being formed between the support member and the outer pipe; and positioning members arranged on the upstream side and the downstream side of the support in the flow direction of the 1 st fluid, for sandwiching the support and positioning the support with respect to the inner tube.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, a double-pipe structure includes an inner pipe and an outer pipe, a 1 st flow path through which a 1 st fluid flows is formed in the inner pipe, and a 2 nd flow path through which a 2 nd fluid flows is formed between the inner pipe and the outer pipe.
The double-pipe structure further comprises: a support member integrally formed of a resin and having an annular shape, the support member being disposed so as to surround the inner pipe in the 2 nd flow path, and a communication hole through which the 2 nd fluid flows being formed between the support member and the outer pipe; and positioning members arranged on the upstream side and the downstream side of the support in the flow direction of the 1 st fluid, for sandwiching the support and positioning the support with respect to the inner tube.
In this case, the communication hole through which the 2 nd fluid flows is formed between the support and the outer tube, which are disposed so as to surround the inner tube in the 2 nd flow path, and therefore the structure of the support can be simplified. Therefore, the double pipe structure can be miniaturized.
Further, since the support is formed of resin, even if the support slides on the outer peripheral surface of the inner tube and the inner peripheral surface of the outer tube due to vibration, no spark is generated. Therefore, the grounding structure of the double-pipe structure can be simplified, and therefore the cost of the double-pipe structure can be reduced.
Further, even if the double tube structure is used for a long period of time, the support is not corroded by rust or the like, and therefore maintenance and management of the double tube structure can be easily performed.
Drawings
Fig. 1 is a longitudinal sectional view of an outer tube support portion of a double tube structure according to embodiment 1 of the present invention.
Fig. 2 is a perspective view of a conventional support member disposed in a double tube structure.
Fig. 3 is a schematic view of a main part of a ship including a double pipe structure according to embodiment 1 of the present invention.
Fig. 4 is a perspective view of a double pipe structure according to embodiment 1 of the present invention.
Fig. 5 is a front view of the support member according to embodiment 1 of the present invention.
Fig. 6 is a perspective view of a support member according to embodiment 1 of the present invention.
Fig. 7 is a view 1 for explaining an assembling step of the linear structure portion according to embodiment 1 of the present invention.
Fig. 8 is a view 2 for explaining an assembling step of the linear structure portion according to embodiment 1 of the present invention.
Fig. 9 is a 3 rd view for explaining an assembling step of the linear structure portion according to embodiment 1 of the present invention.
Fig. 10 is a view 1 for explaining a method of forming a double pipe structure according to embodiment 1 of the present invention.
Fig. 11 is a view 2 for explaining a method of forming a double pipe structure according to embodiment 1 of the present invention.
Fig. 12 is a view showing a method of forming a double pipe structure according to embodiment 1 of the present invention.
Fig. 13 is a view 4 for explaining a method of forming a double pipe structure according to embodiment 1 of the present invention.
Fig. 14 is a view 5 for explaining a method of forming a double pipe structure according to embodiment 1 of the present invention.
Fig. 15 is a view 6 for explaining a method of forming a double pipe structure according to embodiment 1 of the present invention.
Fig. 16 is a view 7 for explaining a method of forming a double pipe structure according to embodiment 1 of the present invention.
Fig. 17 is an 8 th view for explaining a method of forming a double pipe structure according to embodiment 1 of the present invention.
Fig. 18 is a view 9 for explaining a method of forming a double pipe structure according to embodiment 1 of the present invention.
Fig. 19 is a longitudinal sectional view of an outer tube support portion of a double tube structure according to embodiment 2 of the present invention.
Fig. 20 is a front view of a support member according to embodiment 2 of the present invention.
Fig. 21 is a perspective view of a support according to embodiment 3 of the present invention.
Fig. 22 is a perspective view of a support member according to embodiment 4 of the present invention.
Fig. 23 is a perspective view of a support member according to embodiment 5 of the present invention.
Description of the reference numerals
43. An inner tube; 44. an outer tube; 55. 75, 85, a support; 56. 57, a ring; 66. 67, a sleeve; 71. 94, communication holes; pu, double tube construction; rt1, fuel gas flow path; rt2, air flow path.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this case, a double pipe structure and a support member in an engine room accommodating a gas engine will be described.
Fig. 3 is a schematic view of a main part of a ship including a double pipe structure according to embodiment 1 of the present invention.
In the figure, aru is a facility formed at a predetermined portion of a ship in accordance with the IGF rule, and includes a gas safety facility Ar1 as a 1 st region and an ESD (emergency shutdown device) protection facility Ar2 as a 2 nd region. Then, the gas safety machine site Ar1 is provided with a gas engine 22 serving as an engine room. The ESD protection device Ar2 is provided with a fuel tank unit 25, a tank 26, a heat exchanger 28, a blower 31 as a ventilation device, and the like.
Further, an air inlet 33, an air outlet 34, and an on-off valve 35 are disposed outside the plant Aru, and a fuel line L1 connecting the tank 26 and the gas engine 22 and ventilation lines L2, L3 connecting the air inlet 33 and the air outlet 34 are disposed inside the plant Aru, and a double pipe structure Pu is formed from the fuel line L1 and the ventilation line L3 from the gas safety plant Ar1 to the ESD protection plant Ar2.
Liquefied natural gas supplied from outside Aru at the facility to the ship via the fuel tank unit 25 is stored in the tank 26, and then, the liquefied natural gas is fed to the heat exchanger 28 in an amount necessary for driving the gas engine 22, and is heated by warm water in the heat exchanger 28 to be gasified, thereby becoming a fuel gas as the 1 st fluid at a predetermined temperature, for example, about 40 ℃.
The fuel gas flows through the fuel line L1 as a pipe for the fuel gas and is sent to the gas engine 22.
However, in the above-described ship, in consideration of the leakage of the fuel gas to the outside of the fuel line L1, the double pipe structure Pu is formed by surrounding the inner pipe 43 as the 1 st element member formed by the fuel line L1 with the outer pipe 44 as the 2 nd element member as another structure, and the air as the 2 nd fluid fed from the outside of the machine location Aru is supplied between the inner pipe 43 and the outer pipe 44 and discharged to the outside of the machine location Aru.
For this purpose, the ventilation line L2 for intake is arranged between the air intake port 33 and the gas engine 22, the ventilation line L3 for exhaust is arranged between the gas engine 22 and the air discharge port 34, the air sent from the outside of the machine location Aru by the air intake port 33 flows in the ventilation line L2 and is sent to the gas engine 22, after being heated in the gas engine 22, flows between the outer tube 44 and the inner tube 43 formed by the ventilation line L3, is sent from the gas safety machine location Ar1 to the ESD protection machine location Ar2, is separated from the fuel line L1, flows in the ventilation line L3, is sent to the blower 31, and is discharged from the air discharge port 34 to the outside of the machine location Aru.
Therefore, since the negative pressure is formed 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 is not discharged to the outside of the outer pipe 44, but is sucked by the blower 31 and discharged to the outside of the machine site Aru.
In the drawings, 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 described. In this case, the description will be given of a double tube structure Pu having a flange attached to one end, including a straight portion which is a portion extending straight, and a meandering portion which is a meandering portion, and having an L-shape.
Fig. 4 is a perspective view of a double pipe structure according to embodiment 1 of the present invention.
In the figure, reference numeral Pu denotes a double-pipe structure, reference numeral Di (i=1, 2, …) denotes a plurality of linear structures arranged in a linear portion of the double-pipe structure Pu, reference numeral E1 denotes two linear structures arranged adjacent to a meandering portion of the double-pipe structure Pu, in the present embodiment, curved structures connecting the linear structures D1, D2, and reference numeral 51 denotes two linear structures arranged adjacent to a linear portion of the double-pipe structure Pu, in the present embodiment, flanges connecting the linear structures D1 and another linear structure not shown. In the longitudinal direction of the double pipe structure Pu, the side on which the flange 51 is disposed is a flange side, and the opposite side is a non-flange side.
The double tube structure Pu includes: the inner tube 43; an outer tube 44; and a resin support 55 to be described later, which supports the outer tube 44 at outer tube support portions Srj (j=1, 2, …) (fig. 1) to be described later, which are provided at a plurality of portions of the straight structure portion Di, and in which a fuel gas flow path Rt1 as a 1 st flow path through which a fuel gas flows is formed in the inner tube 43 to have a circular cross-sectional shape, and an air flow path Rt2 as a 2 nd flow path through which air flows is formed between the inner tube 43 and the outer tube 44 to have an annular cross-sectional shape.
The inner tube 43 is integrally formed in the curved structure E1 so as to curve in an L shape.
The outer tube 44 includes: a plurality of segmented outer tubes Fk (k=1, 2, …) arranged at the linear structure portion Di from the flange side to the non-flange side so as to surround the inner tube 43; and two bent pipes Gk (k=1, 2) disposed in the bent structure E1 so as to surround the inner pipe 43, for connecting the segmented outer pipe Fk.
In addition, the inner tube 43, the outer tube 44 and the flange 51 are each formed of metal, in this embodiment stainless steel.
Next, an assembling process of the outer tube support portion Srj and the linear structure portion Di will be described.
Fig. 1 is a longitudinal sectional view of an outer tube support portion of a double tube structure according to embodiment 1 of the present invention, fig. 5 is a front view of a support according to embodiment 1 of the present invention, fig. 6 is a perspective view of a support according to embodiment 1 of the present invention, fig. 7 is a 1 st view for explaining an assembling step of a straight line structure portion according to embodiment 1 of the present invention, fig. 8 is a 2 nd view for explaining an assembling step of a straight line structure portion according to embodiment 1 of the present invention, and fig. 9 is a 3 rd view for explaining an assembling step of a straight line structure portion according to embodiment 1 of the present invention. Wherein the cross-sectional view of the support of fig. 1 is the X-X cross-sectional view of fig. 5.
In the figure, reference numeral Srj denotes an outer tube support portion, reference numeral 43 denotes an inner tube, reference numeral 44 denotes an outer tube, reference numeral Rt1 denotes a fuel gas flow path, reference numeral Rt2 denotes an air flow path, reference numeral Fk denotes a segmented outer tube, reference numeral 55 denotes a support member which is fitted over the inner tube 43 at the outer tube support portion Srj, and reference numerals 56 and 57 denote rings as positioning members which are fitted over the inner tube 43 at the flange-side end portion and the non-flange-side end portion of the support member 55 and are disposed in contact with the support member 55, thereby positioning the support member 55.
The support 55 is formed of resin, in this embodiment, fluororesin, and is formed integrally by cutting a tubular member formed by a molding method such as injection molding into a predetermined length and machining the tubular member.
Therefore, since the abrasion resistance, heat resistance, and weather resistance are high, the support 55 is not deformed even when 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, 57 are formed of metal, in this embodiment stainless steel, and have an inner diameter slightly larger than the outer diameter of the inner tube 43 so that the rings 56, 57 can slide on the inner tube 43 and be externally fitted to the inner tube 43.
The ring 56 is bonded and fixed to the inner tube 43 by the adhesive 60 made of resin applied to the flange-side edge eg1, and the ring 57 is bonded and fixed to the inner tube 43 by the adhesive 60 applied to the non-flange-side edge eg 2.
In the present embodiment, as the adhesive 60, a one-liquid moisture-curable elastic adhesive formed of a silyl group-containing silicone resin and suitable for adhesion between metals is used.
The support 55 is formed of an annular body, and includes: an annular portion 61; and a convex portion 65, wherein the convex portion 65 is formed by protruding radially outward at a plurality of positions, in the present embodiment, 4 positions, in the circumferential direction of the support 55. The inner diameter of the annular portion 61 is slightly larger than the outer diameter of the inner tube 43 so that the support member 55 can slide on the inner tube 43 and be externally fitted to the inner tube 43.
Then, when the support 55 is surrounded by the outer tube 44, a communication hole 71 is formed between the convex portions 65 in the circumferential direction of the support 55, and the communication hole 71 has a fan-like shape, so that the air flow path Rt2 on the flange side of the support 55 communicates with the air flow path Rt2 on the non-flange side of the support 55, and air flows.
In assembling the straight structure Di at the outer tube support portion Srj, first, as shown in fig. 7, the ring 57, the support member 55, and the ring 56 are sequentially fitted over the inner tube 43, and the support member 55 is sandwiched and positioned by the rings 56, 57.
Next, an adhesive 60 is applied to the edge eg1 of the ring 56 and the edge eg2 of the ring 57, and the rings 56 and 57 are fixed to the inner tube 43, thereby forming a support unit Uj (j=1, 2, …) composed of the support 55 and the rings 56 and 57. In this case, the adhesive 60 is preferably applied to the entire circumferential direction of the edges eg1, eg2, but may be applied to at least one portion in the circumferential direction.
Next, when the segmented outer tube Fk is sleeved over the inner tube 43 and the support 55 as indicated by the arrows in fig. 8, a straight-line structure portion Di is formed as shown in fig. 9.
Next, a method for forming the double pipe structure Pu will be described.
Fig. 10 is a view 1 for explaining a method of forming a double pipe structure according to embodiment 1 of the present invention, fig. 11 is a view 2 for explaining a method of forming a double pipe structure according to embodiment 1 of the present invention, fig. 12 is a view 3 for explaining a method of forming a double pipe structure according to embodiment 1 of the present invention, fig. 13 is a view 4 for explaining a method of forming a double pipe structure according to embodiment 1 of the present invention, fig. 14 is a view 5 for explaining a method of forming a double pipe structure according to embodiment 1 of the present invention, fig. 15 is a view 6 for explaining a method of forming a double pipe structure according to embodiment 1 of the present invention, fig. 16 is a view 7 for explaining a method of forming a double pipe structure according to embodiment 1 of the present invention, fig. 17 is a view 8 for explaining a method of forming a double pipe structure according to embodiment 1 of the present invention, and fig. 18 is a view 9 for explaining a method of forming a double pipe structure according to embodiment 1 of the present invention.
First, a tube member, not shown, made of stainless steel is cut to a predetermined length, and bending is performed to form an inner tube 43 including linear portions h1, h2 and a meandering portion h3 as shown in fig. 10. Reference numeral eg11 is an edge of the flange side of the inner tube 43, and reference numeral eg12 is an edge of the non-flange side of the inner tube 43.
Next, as shown by the arrows in fig. 11, the ring 57, the support 55, and the ring 56 are sequentially applied to the inner tube 43 at the flange-side edge eg11 of the inner tube 43, and the support 55 is sandwiched and positioned by the rings 56, 57 at the outer tube support Sr 1. Then, an adhesive 60 is applied to the edge eg1 of the ring 56 and the edge eg2 of the ring 57 to fix the rings 56, 57 to the inner tube 43, and as shown in fig. 12, a support unit U1 is formed by the support 55 and the rings 56, 57.
Next, the segmented outer tube F1 is sleeved over the inner tube 43 and the support unit U1 to form a straight structure D1.
Then, the bent pipes G1 and G2 are fitted over the inner pipe 43 as indicated by arrows at the edge eg12 on the non-flange side of the inner pipe 43, the segmented outer pipe F1 and the bent pipe G1 are joined by welding, and the bent pipe G1 and the bent pipe G2 are joined by welding, so that a curved structure E1 is formed as shown in fig. 14. At this time, the flange-side edge eg11 of the inner tube 43 and the flange-side edge eg13 of the segmented outer tube F1 are brought into contact with the flange 51, and the inner tube 43 and the segmented outer tube F1 are joined to the flange 51 by welding.
Next, as shown in fig. 15, the ring 56, the support 55, and the ring 57 are sequentially applied to the inner tube 43 at the edge eg12 on the non-flange side of the inner tube 43, the support 55 is sandwiched between the rings 56 and 57 at the outer tube support Sr2, the rings 56 and 57 are fixed to the inner tube 43 by the adhesive 60, the ring 56, the support 55, and the ring 57 are sequentially applied to the inner tube 43, the support 55 is sandwiched between the rings 56 and 57 at the outer tube support Sr3, and the rings 56 and 57 are fixed to the inner tube 43 by the adhesive 60. As shown in fig. 16, the support unit U2 is formed in the outer tube support portion Sr2, and the support unit U3 is formed in the outer tube support portion Sr 3.
Next, as shown by the arrows in fig. 17, the segmented outer tube F2 is sleeved over the inner tube 43 and the support units U2, U3 at the edge eg12 on the non-flange side of the inner tube 43.
Then, when the bent pipe G2 and the segmented outer pipe F2 are joined by welding, a straight structure D2 is formed as shown in fig. 18.
As shown in fig. 18, the double tube structure Pu including the straight structure portion Di and the curved structure portion E1 is formed.
As described above, in the present embodiment, the support 55 integrally formed of resin is disposed in the air flow path Rt2 between the inner tube 43 and the outer tube 44, and the communication hole 71 through which air flows is formed between the support 55 and the outer tube 44, so that the structure of the support 55 can be simplified. Therefore, the double pipe structure Pu can be miniaturized, and the mounting performance for the ship can be improved.
Further, since the support member 55 is formed of resin, even if the support member 55 slides with the outer peripheral surface of the inner tube 43 and the inner peripheral surface of the outer tube 44 due to vibration, no spark is generated. Therefore, the grounding structure of the double tube structure Pu can be simplified, and the cost of the double tube structure Pu can be reduced.
Further, even when the double pipe structure Pu is used for a long period of time, the support 55 is not corroded by rust or the like, and therefore maintenance and management of the double pipe structure Pu can be simplified.
In addition, since it is not necessary to join the inner tube 43 with the rings 56, 57 for positioning the support 55 by welding, the support 55 is not broken by heat. Accordingly, the durability of the support 55 can be further improved.
Next, embodiment 2 of the present invention will be described in which the support 55 is positioned without using the adhesive 60. Here, members having the same structure as in embodiment 1 are given the same reference numerals, and the effects of this embodiment are cited for the effects of the invention due to the same structure.
Fig. 19 is a longitudinal sectional view of an outer tube support portion of a double tube structure according to embodiment 2 of the present invention, and fig. 20 is a front view of a support according to embodiment 2 of the present invention. Wherein the cross-sectional view of the support of fig. 19 is the Y-Y cross-sectional view of fig. 20.
In the figure, reference numeral Srj denotes an outer tube support portion, reference numeral 43 denotes an inner tube as a 1 st element member, reference numeral 44 denotes an outer tube as a 2 nd element member, reference numeral Rt1 denotes a fuel gas flow path as a 1 st flow path, reference numeral Rt2 denotes an air flow path as a 2 nd flow path, reference numeral Fk denotes a segmented outer tube, reference numeral 55 denotes a support, reference numerals 66 and 67 denote sleeves as positioning members, which are fitted over the inner tube 43 at the flange-side end and the non-flange-side end of the support 55 and are disposed in contact with the support 55, to position the support 55.
The sleeves 66, 67 are made of metal, in this embodiment stainless steel, and have an inner diameter slightly larger than the outer diameter of the inner tube 43 so that the sleeves 66, 67 can slide on the inner tube 43 and be externally fitted to the inner tube 43.
The sleeve 66 is fixed to the inner tube 43 by welding the flange-side edge eg21 thereof, and the sleeve 67 is fixed to the inner tube 43 by welding the non-flange-side edge eg22 thereof. The support unit Wj (j=1, 2, …) is constituted by the support 55 and the sleeves 66, 67 sandwiching the support 55.
In order to avoid breakage of the support 55 due to heat transfer to the support 55 when the sleeves 66, 67 are fixed to the inner tube 43 by welding, the axial length of the sleeves 66, 67 is a predetermined value, in the present embodiment, 100 [ mm ] or more.
Next, embodiment 3 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 and 57 (fig. 1), the sleeves 66 and 67, and the like. The same reference numerals are given to members having the same structures as those of embodiment 1 and embodiment 2, and the effects of this embodiment are cited for the effects of the invention due to the same structures.
Fig. 21 is a perspective view of a support according to embodiment 3 of the present invention.
In the figure, reference numeral 75 denotes a support member which is formed of resin, in the present embodiment, fluororesin, and is formed integrally by cutting a tubular member formed by a molding method such as injection molding into a predetermined length and machining the member, and has a ring-like shape.
The support 75 has an annular shape, including: an annular portion 81; and a convex portion 65, wherein the convex portion 65 is formed by protruding radially outward at a plurality of positions, in the present embodiment, 4 positions, in the circumferential direction of the annular portion 81. The inner diameter of the annular portion 81 is slightly larger than the outer diameter of the inner tube 43 so that the support member 75 can slide on the inner tube 43 (fig. 1) as the 1 st element member and be fitted over the inner tube 43.
Then, when the support 75 is surrounded by the outer tube 44, a communication hole, not shown, having a fan-like shape is formed between the convex portions 65 in the circumferential direction of the support 75, and the air flow path Rt2 as the 2 nd flow path on the flange side of the support 75 is communicated with the air flow path Rt2 as the 2 nd flow path on the non-flange side of the support 75, so that air flows.
Grooves m1 and m2 having a semicircular cross section are formed at a plurality of positions in the circumferential direction of the inner circumferential surface Sa of the annular portion 81, in the present embodiment, at two positions, so as to extend in the axial direction, and stepped portions 87 and 88 having a semicircular shape, which have diameters slightly larger than the diameters of the grooves m1 and m2, are formed at both ends of the grooves m1 and m 2.
When the linear structure portion Di (fig. 4) at the outer tube support portion Srj is assembled, the support member 75 is fitted over the inner tube 43, and then the adhesive 60 (fig. 7) as a positioning member is injected into the gap between the grooves m1 and m2 and the inner tube 43. In the present embodiment, the aforementioned one-liquid moisture-curable elastic adhesive formed of a silicone resin containing a silane group is used as the adhesive 60.
Thereby, the support 75 is positioned with respect to the inner tube 43 by the adhesive 60. That is, the adhesive 60 is cured at the stepped portions 87 and 88 to form the enlarged diameter portion, so that the support 75 does not move in the axial direction and is separated from the cured adhesive 60.
Next, embodiment 4 of the present invention will be described in which the support member 75 can be positioned with respect to the inner tube 43 without using the rings 56, 57, the sleeves 66, 67, and the like. The same reference numerals are given to members having the same structures as those of embodiment nos. 1 to 3, and the effects of this embodiment are cited for the effects of the invention due to the same structures.
Fig. 22 is a perspective view of a support member according to embodiment 4 of the present invention.
In this case, grooves m3 and m4 having an arc shape are formed in a plurality of portions in the circumferential direction, in the present embodiment, two portions, in the end portion on the flange side and the end portion on the non-flange side in the axial direction of the inner peripheral surface Sa of the annular portion 81 so as to extend in the circumferential direction.
When the straight line structure portion Di (fig. 4) at the outer tube support portion Srj (fig. 1) is assembled, the support 75 is fitted over the inner tube 43 as the 1 st element member, and then the adhesive 60 (fig. 7) as the positioning member is injected into the gap between the grooves m3, m4 and the inner tube 43.
Thereby, the support 75 is positioned with respect to the inner tube 43 by the adhesive 60. That is, the adhesive 60 is cured in the grooves m3, m4, and therefore the support 75 does not move in the axial direction.
Next, embodiment 5 of the present invention will be described in which a communication hole is formed in a support. The same reference numerals are given to members having the same structures as those of embodiment 1 and embodiment 2, and the effects of this embodiment are cited for the effects of the invention due to the same structures.
Fig. 23 is a perspective view of a support member according to embodiment 5 of the present invention.
In the figure, reference numeral 85 denotes a support member formed of resin, in this embodiment, fluororesin, and formed integrally by cutting a tubular member formed by a molding method such as injection molding into a predetermined length and machining the member.
In addition, the support 85 includes: an inner annular portion 91 as a 1 st annular body; an outer annular portion 92 as a 2 nd annular body formed at a predetermined interval from the inner annular portion 91 at a position radially outside the inner annular portion 91; and a connecting portion 93 connecting the inner annular portion 91 and the outer annular portion 92 at a plurality of positions, in the present embodiment, 4 positions in the circumferential direction of the support 85. The inner annular portion 91 has an inner diameter slightly larger than the outer diameter of the inner tube 43 so that the support 85 can slide on the inner tube 43 (fig. 1) as the 1 st element member and be fitted around the inner tube 43, and the outer annular portion 92 has an outer diameter slightly smaller than the inner diameter of the outer tube 44 so that the support 85 can slide on the outer tube 44 as the 2 nd element member and be fitted inside the outer tube 44.
Then, a communication hole 94 is formed between the coupling portions 93 in the circumferential direction of the support 85, and the communication hole 94 has a fan-like shape, and the air flow path Rt2 as the 2 nd flow path on the flange side of the support 85 and the air flow path Rt2 as the 2 nd flow path on the non-flange side of the support 85 are communicated with each other to allow air to circulate.
In the present embodiment, as a positioning member for positioning the support 85, the rings 56 and 57 (fig. 1), the sleeves 66 and 67 (fig. 19), the adhesive 60 (fig. 7), and the like are used.
The present invention is not limited to 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.
Claims (13)
1. A double pipe structure which is arranged at a machine site of a ship and comprises an inner pipe made of metal and an outer pipe made of metal, wherein a 1 st flow path through which fuel gas flows is formed in the inner pipe, a 2 nd flow path through which air flows is formed between the inner pipe and the outer pipe,
the double-pipe structure has:
a support member integrally formed of a resin and having an annular shape, the support member being provided with a communication hole through which air flows, the support member being provided with an outer tube being fitted over the inner tube in the 2 nd flow path; and
and a positioning member fixed to the inner tube at positions upstream and downstream of the support in the flow direction of the fuel gas, the positioning member sandwiching the support and positioning the support with respect to the inner tube.
2. The double-pipe structure according to claim 1, wherein,
the positioning member is a ring fixed to the inner tube with an adhesive.
3. The double-pipe structure according to claim 1, wherein,
the positioning member is a sleeve fixed to the inner tube by welding.
4. The double-pipe structure according to claim 1, wherein,
the positioning member is an adhesive injected and cured into a groove formed in the support.
5. The double-pipe structure according to any one of claims 1 to 4, wherein,
the support is formed of a fluororesin.
6. A support member which is integrally formed of a fluororesin and is disposed in a 2 nd flow path of a double pipe structure disposed at a machine site of a ship, the support member comprising an inner pipe made of metal and an outer pipe made of metal, a 1 st flow path through which a fuel gas flows being formed in the inner pipe, the 2 nd flow path through which air flows being formed between the inner pipe and the outer pipe,
the support has:
a ring body which is sleeved on the inner pipe; and
a convex portion formed by protruding radially outward from the annular body at a plurality of portions in the circumferential direction for supporting the outer tube, and
the support is sandwiched by positioning members fixed to the inner tube at positions on the upstream side and the downstream side of the support in the flow direction of the fuel gas, and is thereby positioned with respect to the inner tube.
7. The support according to claim 6, wherein,
the positioning member is a ring fixed to the inner tube with an adhesive.
8. The support according to claim 6, wherein,
the positioning member is a sleeve fixed to the inner tube by welding.
9. The support according to claim 6, wherein,
the positioning member is an adhesive injected and cured into a groove formed in the support.
10. A support member which is integrally formed of a fluororesin and is disposed in a 2 nd flow path of a double pipe structure disposed at a machine site of a ship, the support member comprising an inner pipe made of metal and an outer pipe made of metal, a 1 st flow path through which a fuel gas flows being formed in the inner pipe, the 2 nd flow path through which air flows being formed between the inner pipe and the outer pipe,
the support has:
a 1 st annular body which is sleeved on the inner pipe;
a 2 nd annular body formed at a predetermined interval from the 1 st annular body at a position radially outside the 1 st annular body, for supporting the outer tube; and
a connecting portion connecting the 1 st annular body and the 2 nd annular body at a plurality of positions in the circumferential direction, and
the support is sandwiched by positioning members fixed to the inner tube at positions on the upstream side and the downstream side of the support in the flow direction of the fuel gas, and is thereby positioned with respect to the inner tube.
11. The support according to claim 10, wherein,
the positioning member is a ring fixed to the inner tube with an adhesive.
12. The support according to claim 10, wherein,
the positioning member is a sleeve fixed to the inner tube by welding.
13. The support according to claim 10, wherein,
the positioning member is an adhesive injected and cured into a groove formed in the support.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020060471A JP6999729B2 (en) | 2020-03-30 | 2020-03-30 | Double tube structure and support |
| JP2020-060471 | 2020-03-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113464316A CN113464316A (en) | 2021-10-01 |
| CN113464316B true CN113464316B (en) | 2023-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110118491.XA Active CN113464316B (en) | 2020-03-30 | 2021-01-28 | Double pipe structure and support |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6999729B2 (en) |
| KR (1) | KR102489158B1 (en) |
| CN (1) | CN113464316B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116293147B (en) * | 2023-03-13 | 2023-11-21 | 浙江省海洋开发研究院 | LNG ship gas double-wall pipe connecting device |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR102489158B1 (en) | 2023-01-13 |
| JP2021156272A (en) | 2021-10-07 |
| CN113464316A (en) | 2021-10-01 |
| KR20210122029A (en) | 2021-10-08 |
| JP6999729B2 (en) | 2022-01-19 |
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