WO2016068097A1

WO2016068097A1 - Configuration for double pipe, engine with configuration for double pipe, and ship with configuration for double pipe

Info

Publication number: WO2016068097A1
Application number: PCT/JP2015/080160
Authority: WO
Inventors: 健志登; 貞雄桑鶴
Original assignee: ヤンマー株式会社
Priority date: 2014-10-31
Filing date: 2015-10-27
Publication date: 2016-05-06

Abstract

Provided is a configuration for a double pipe, wherein leakage from the inner pipe can be reliably prevented. A connection section 50 for double pipes joins: a flange 55B formed at an end of a double pipe 51A which consists of an outer pipe 53A and an inner pipe 52A installed within the outer pipe 53A; and a flange 55C formed at an end of a double pipe 51D, thereby connecting the double pipe 51A and the double pipe 51D. The flange 55B and the flange 55C are fitted to each other, and a seal section for sealing the outer pipe 53A or the inner pipe 52A is provided on the fitting surface of the fitting section 16B.

Description

Double piping configuration, engine with double piping configuration, and ship with double piping configuration

The present invention relates to a double piping configuration, an engine having a double piping configuration, and a marine technology having a double piping configuration.

The double pipe was inserted with other pipes inside the pipe and the inner pipe (hereinafter referred to as the inner pipe) maintained a certain clearance with respect to the outer pipe (hereinafter referred to as the outer pipe). It is well-known as a piping of composition (for example, patent documents 1). The double pipe is used for a pipe through which a fluid containing a hazardous substance flows, for example, in a radioactive waste treatment facility or a nuclear power generation facility.

By the way, even in a ship equipped with a gas engine, a double pipe is used as a fuel gas pipe from the viewpoint of safety. And the connection of double piping is mainly comprised by the flange connection. Furthermore, the ship's laws and regulations, etc. recommend the connection part of the ship's double pipe that can reliably prevent the leakage of the inner pipe.

Special table 2011-506856 gazette

The problem to be solved by the present invention is to provide a double pipe configuration capable of reliably preventing leakage of the inner pipe, an engine having a double pipe configuration, and a ship having a double pipe configuration. It is.

The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

The present invention includes a flange formed on an end side of one double pipe constituted by an outer pipe and an inner pipe housed in the outer pipe, and formed on an end side of the other double pipe. The other flange is joined to connect the one double pipe and the other double pipe, and the one flange and the other flange are fitted together. And the seal | sticker part which seals the said outer tube | pipe or the said inner tube | pipe is provided in the fitting surface of the said fitting part.

This invention is the structure of the said double piping, Comprising: The said 1 flange and the said other flange are fitted by the 1st fitting part and the 2nd fitting part formed in this 1st fitting part. A seal portion that seals the outer tube is provided on a side surface of the first fitting portion, and a seal portion that seals the inner tube is provided on a side surface of the second fitting portion.

The present invention is a configuration of the double pipe, wherein the one flange portion is configured to be slidable in the axial direction with respect to the one pipe.

The present invention is a configuration of the double pipe, wherein the outer pipe and the inner pipe of the one pipe or the other pipe are provided with a deviation absorbing portion that absorbs an axial deviation.

The present invention is a configuration of the double pipe, and includes a fixing portion that fixes the axial position of the outer pipe of the one pipe and the one flange portion.

The present invention is an engine and has the above-described double piping configuration.

The present invention is a ship and has the above-described double pipe configuration.

According to the double pipe configuration, the engine having the double pipe configuration, and the ship having the double pipe configuration according to the present invention, it is possible to reliably prevent leakage of the inner pipe.

The side view which shows the whole structure of a ship. The schematic diagram which shows the fuel system of an engine. The side view which shows the whole structure of an engine. The side view which shows the structure of a gas manifold. Side surface sectional drawing which shows the structure of a branch pipe and a connecting pipe. Side surface sectional drawing which shows the structure at the time of attachment and removal of a connecting pipe. The schematic diagram which shows the structure of the double piping of 2nd embodiment. The schematic diagram which shows the structure of the double piping of 3rd embodiment. The schematic diagram which shows the structure of the double piping of 4th embodiment. The schematic diagram which shows the structure of the double piping of 5th embodiment. The schematic diagram which shows the structure of the double piping of 6th embodiment.

The structure of the ship 500 is demonstrated using FIG.
In addition, in FIG. 1, the structure of the ship 500 is represented by the side view. In the following, it is assumed that the direction of the arrow P in FIG. 1 is the front side.

The ship 500 is equipped with an engine 100 (see FIG. 2) that is an embodiment of the engine of the present invention. The ship 500 includes a hull 502, a cabin 503 provided on the stern side of the hull 502, a funnel 504 disposed behind the cabin 503, and a pair of

propellers

505 and 505 provided at the lower rear of the hull 502, Rudder 506.

A pair of

skegs

508 and 508 are integrally formed on the stern side bottom 507 (twin skeg). A propeller shaft 509 that rotates the propeller 505 is pivotally supported on the skeg 508. The skeg 508 is formed symmetrically with respect to a hull center line (not shown) that divides the left-right width direction of the hull 502.

A hold 510 is provided on the bow side and the center of the hull 502. An engine room 511 is provided on the stern side in the hull 502. In the engine room 511, a pair of propulsion and

power generation mechanisms

512 and 512, which serve both as a drive source for the propeller 505 and a power supply source for the ship 500, are arranged on the left and right sides of the hull center line.

The propulsion and power generation mechanism 512 transmits rotational power to the propulsion shaft 509 and drives the propeller 505 to rotate. The propulsion and power generation mechanism 512 includes an engine 100 that is a drive source of the propeller 505, a speed reducer (not shown) that transmits the power of the engine 100 to the propulsion shaft 509, and a shaft drive generator that generates power using the power of the engine 100 ( (Not shown).

A fuel system of engine 100 will be described with reference to FIG.
In FIG. 2, the fuel system of the engine 100 is schematically shown.

Engine 100 is an embodiment according to the engine of the present invention. Engine 100 is supplied with fuel from two

fuel supply paths

121 and 122. A liquid fuel tank 129 is connected to the fuel supply path 122.

In the fuel supply path 121, a gas fuel tank 125 that stores liquefied gaseous fuel, a vaporizer 126 that vaporizes liquefied fuel (fuel gas) in the gas fuel tank 125, and a fuel gas from the vaporizer 126 to the engine 100. And a gas valve unit 127 for adjusting the supply amount of the gas.

The configuration of the engine 100 will be described with reference to FIG.
In FIG. 3, the configuration of the engine 100 is shown in a right side view. In the following, it is assumed that the direction of the arrow P in FIG. 3 is the front side.

The engine 100 is a dual fuel engine, and includes a premixed combustion method in which fuel gas such as natural gas is mixed with air and burned, and a diffusion combustion method in which liquid fuel (fuel oil) such as heavy oil is diffused and burned. Is selected and driven.

The engine 100 includes an engine output shaft in the cylinder block 101 and a cylinder head 102 mounted on the cylinder block 101.

On the front end side of the engine 100, a supercharger 140 composed of a compressor (not shown) and a turbine (not shown) and an intercooler 111 that cools compressed air by the compressor of the supercharger 140 are arranged. ing. On the rear end side of the engine 100, an ECU (Engine Control Unit) 150 that controls the operation of each part of the engine 100 and a flywheel 130 that is connected to a speed reducer and rotated are arranged.

A gas manifold 112 is extended on the right side surface of the cylinder head 102. The gas manifold 112 is connected to the gas inlet pipe 113. On the right side surface of the cylinder head 102, a heat insulating cover 115 is provided above the gas manifold 112 to cover the outer periphery of the exhaust manifold (not shown).

The gas manifold 112 and the gas inlet pipe 113 are gas pipes that introduce gas into the combustion chamber of the engine 100 from the gas fuel tank 125 (see FIG. 2). The gas manifold 112 and the gas inlet pipe 113 are configured as a double pipe.

The double pipe is a pipe having a configuration in which another pipe is arranged inside the pipe and the inner pipe is inserted in a state of maintaining a certain clearance with respect to the outer pipe (see FIG. 5). The above-described fuel supply path 121 supported by the ship 500 and connected from the gas fuel tank 125 to the engine 100 is also configured as a double pipe (see FIG. 2).

An oil pan 141 that collects lubricating oil flowing through the cylinder block 101 is provided below the cylinder block 101. In addition, on the right side surface of the cylinder block 101, a lubricating oil pump 142 that sucks lubricating oil accumulated in the oil pan 141, a lubricating oil cooler 143, and a lubricating oil stiffness 144 are arranged.

The configuration of the gas manifold 112 will be described with reference to FIG.
In FIG. 4, the configuration of the gas manifold 112 is schematically shown in a side view. In the following, description will be made according to the axial direction and radial direction shown in FIG.

The gas manifold 112 is a first embodiment according to the configuration of the double pipe of the present invention. Note that the configuration of the double pipe of the present invention is not limited to the gas manifold 112 in the engine 100. For example, the double pipe configuration of the present invention may be applied to the double pipe configuration of the gas inlet pipe 113 of the engine 100 or the fuel supply path 121.

The gas manifold 112 is configured by double piping as described above. The gas manifold 112 includes the branch pipe 10 and the connection pipe 20. The gas manifold 112 is configured by alternately connecting the branch pipes 10 and the connection pipes 20.

The branch pipe 10 is configured in a substantially T shape. The branch pipe 10 includes a main pipe 13 and a branch pipe 14. A flange 11 is provided on one side of the main pipe 13, and a flange 12 is provided on the other side of the main pipe 13. The branch pipe 14 is connected to a pipe that branches from the main pipe 13 in the radial direction and reaches the cylinder head 102.

Here, as a matter to be noted, the flange 11 is configured to be slidable in the axial direction with respect to the main pipe 13.

The connecting pipe 20 connects one side of the main pipe 13 of the branch pipe 10 to the other side. A flange 21 to be joined to the flange 12 is provided on one side of the connecting pipe 20, and a flange 22 to be joined to the flange 11 is provided on the other side of the connecting pipe 20.

The structure of the branch pipe 10 and the connection pipe 20 is demonstrated using FIG.
In addition, in FIG. 5, the structure of the branch pipe 10 and the connecting pipe 20 is typically represented by side sectional view. FIG. 5 shows a state in which the connection pipe 20 is attached to the branch pipe 10. Further, the following description will be given according to the axial direction shown in FIG.

In the gas manifold 112, the flange 11 of the branch pipe 10 and the flange 22 of the connection pipe 20 are joined by a bolt or the like (not shown), and the flange 12 of the branch pipe 10 and the flange 21 of the connection pipe 20 are not shown. ).

As described above, the branch pipe 10 includes the flange 11, the flange 12, the main pipe 13, the branch pipe 14, and the fixing member 30 as a fixing portion. The main pipe 13 and the branch pipe 14 include an outer pipe 15 and an inner pipe 16 provided in the outer pipe 15. The outer tube 15 and the inner tube 16 are formed continuously by integral molding.

Here, a passage formed inside the inner tube 16 is referred to as a passage 10i, and a passage formed between the outside of the inner tube 16 and the inside of the outer tube 15 is referred to as a passage 10o.

The flange 11 is provided on one side of the main pipe 13. The flange 11 is formed in a substantially ring shape in which a first hollow portion 11i and a second hollow portion 11p having a diameter expanded with respect to the first hollow portion 11i are formed.

The flange 11 is configured to be slidable in the axial direction with respect to the main pipe 13. More specifically, the flange 11 is configured such that the first hollow portion 11i and the outer side of the inner tube 16 slide, and the second hollow portion 11p and the outer side of the outer tube 15 slide.

The fixing member 30 is a member that fixes the flange 11 and the outer tube 15 to each other in the axial direction. The fixing member 30 is formed in a substantially L shape in a side view, and is configured to be fixed to the flange 11 and the outer tube 15 by fixtures B1 and B2 (see FIG. 6).

A convex portion 11 t is formed on the front end side of the flange 11. The convex portion 11t is formed so as to be fitted in the concave portion 22u of the flange 22 in the axial direction when the flange 11 and the flange 22 are joined.

A passage 11o is formed in the convex portion 11t of the flange 11. The passage 11o communicates with the passage 10o. Further, the passage 11o communicates with the passage 22o when the flange 11 and the flange 22 are joined.

The flange 12 is provided on the other side of the main pipe 13. The flange 12 is formed continuously and integrally with the main pipe 13. A concave portion 12 u is formed on the front end side of the flange 12. The concave portion 12u is formed so as to be fitted in the convex portion 21t of the flange 21 in the axial direction when the flange 12 and the flange 21 are joined.

In the recess 12u of the flange 12, a passage 12o is formed. The passage 12o communicates with the passage 10o. Further, the passage 12o communicates with the passage 21o when the flange 12 and the flange 21 are joined.

The connecting pipe 20 includes a flange 21, a flange 22, an outer pipe 23, an inner pipe 24, and a rectifying pipe 25. Here, a passage formed inside the inner tube 24 is referred to as a passage 20i, and a passage formed between the outside of the inner tube 24 and the inside of the outer tube 23 is referred to as a passage 20o.

The flange 21 is provided on one side of the outer tube 23 and the inner tube 24. A convex portion 21 t is formed on the distal end side of the flange 21. The convex portion 21t is formed so as to be fitted in the concave portion 12u of the flange 12 in the axial direction when the flange 21 and the flange 12 are joined.

The inner tube 24 is inserted into the flange 21. The passage 20i formed by the inner tube 24 communicates with the passage 10i when the flange 21 and the flange 12 are joined.

A passage 21 o is formed in the convex portion 21 t of the flange 21. The passage 21o communicates with the passage 20o. The passage 21o communicates with the passage 12o when the flange 11 and the flange 22 are joined.

The flange 22 is provided on the other side of the outer tube 23 and the inner tube 24. A recess 22 u is formed on the front end side of the flange 22. The concave portion 22u is formed so as to be fitted in the convex portion 11t of the flange 11 in the axial direction when the flange 11 and the flange 22 are joined.

The inner tube 24 is inserted into the flange 22. The passage 20i formed by the inner tube 24 communicates with the passage 10i when the flange 11 and the flange 22 are joined.

In the recess 22u of the flange 22, a passage 22o is formed. The passage 22o communicates with the passage 20o. Further, the passage 22o communicates with the passage 11o when the flange 11 and the flange 22 are joined.

The outer tube 23 is provided with a deviation absorbing portion 23j. The deviation absorbing portion 23j is formed in a bellows shape. By setting it as such a structure, the outer tube | pipe 23 can be arrange | positioned by shifting the other axial center with respect to the axial center of one side.

The inner tube 24 is provided with a deviation absorbing portion 24j. The deviation absorbing portion 24j is formed in a bellows shape. By setting it as such a structure, the inner tube 24 can be arrange | positioned by shifting the other axial center with respect to the axial center of one side.

The rectifying pipe 25 rectifies the flow of the fuel gas flowing through the inner pipe 24 (passage 20i). The rectifying tube 25 is formed in a substantially cylindrical shape. The rectifying pipe 25 is inserted inside the deviation absorbing portion 24j of the inner pipe 24.

The passage formed by communication between the first hollow portion 11i and the passage 20i is sealed by a seal structure 22s as a seal portion. The seal structure 22 s is configured by fitting an O-ring into a circumferential groove formed inside the passage 22 o on the front end surface of the recess 22 u of the flange 22.

The passage formed by the communication between the first hollow portion 11i and the passage 10i is sealed by a sealing structure 16s. The seal configuration 16 s is configured by fitting an O-ring into a groove formed around the side surface of the inner tube 16 in the axial direction.

The passage formed by communicating the passage 11o and the passage 22o is sealed by a seal structure 11s as a seal portion. The seal configuration 11 s is configured by fitting an O-ring into a groove formed around the axial side surface of the convex portion 11 t of the flange 11.

The passage formed by communicating the passage 11o and the passage 10o is sealed by a seal structure 15s. The seal structure 15s is configured by fitting an O-ring into a groove formed around the side surface of the outer tube 15 in the axial direction.

The passage formed by communicating the passage 10i and the passage 20i is sealed by a seal configuration 12s as a seal portion. The seal configuration 12s is configured by fitting an O-ring into a circumferential groove formed inside the passage 12o on the front end surface of the recess 12u of the flange 12.

A passage formed by the passage 12o and the passage 21o communicating with each other is sealed by a seal configuration 21s as a seal portion. The seal configuration 21 s is configured by fitting an O-ring into a groove formed around the side surface in the axial direction of the convex portion 21 t of the flange 21.

The structure at the time of attachment and removal of the connecting pipe 20 will be described with reference to FIG.
In FIG. 6A, the configuration when the connecting pipe 20 is attached is shown in a side sectional view. Moreover, in FIG.6 (B), the structure at the time of the removal of the connecting pipe 20 is represented by side sectional view. Further, the following description will be given according to the axial direction shown in FIG.

As shown in FIG. 6A, in a state where the connection pipe 20 is attached between the branch pipe 10 and the branch pipe 10, the flange 11 is fixed at a position that protrudes most in the axial direction with respect to the main pipe 13. It is fixed by the member 30.

At this time, the connecting pipe 20 has the flange 21 fitted in the flange 12 in the axial direction, the flange 11 fitted in the flange 22 in the axial direction, and is arranged between the branch pipe 10 and the branch pipe 10.

Further, the connecting pipe 20 absorbs the axial deviation between the flange 11 and the flange 12 by the deviation absorbing portion 24j of the inner tube 24 and the deviation absorbing portion 23j of the outer tube 23.

As shown in FIG. 6B, when the connecting pipe 20 is removed from between the branch pipe 10 and the branch pipe 10, first, the fixture B1 for fixing the fixing member 30 and the main pipe 13 (FIG. 6A). )) Is removed so that the flange 11 is movable in the axial direction with respect to the main pipe 13.

Then, only the fixing tool B2 (see FIG. 6A) for fixing the fixing member 30 and the main pipe 13 is removed, and the flange 11 and the fixing member 30 are movable in the axial direction in a state where the fixing member B1 is fixed by the fixing tool B1. Alternatively, the fixing tool B1 and the fixing tool B2 are removed, and the fixing member 30 is removed from the flange 11 and the main pipe 13 so that the flange 11 is movable in the axial direction with respect to the main pipe 13.

At this time, the connecting pipe 20 is movable in the axial direction. The connection pipe 20 is removed from between the branch pipe 10 and the branch pipe 10 by removing the flange 21 from the flange 12 and the flange 11 from the flange 22.

Note that the flange 11 is movable by the axial length L of the second hollow portion 11p (see FIG. 6A). The axial length L of the second hollow portion 11p is set to a length sufficient for removing the flange 21 of the connecting pipe 20 from the flange 12 and removing the flange 11 from the flange 22.

The effects of the gas manifold 112 and the engine 100 will be described.
According to the gas manifold 112 and the engine 100, the connecting pipe 20 including the

flanges

11 and 22 having the insertion structure can be easily removed.

Moreover, according to the gas manifold 112 and the engine 100, the axial displacement of the connecting pipe 20 including the

flanges

11 and 22 having the insertion structure can be absorbed by the

displacement absorbing portions

23j and 24j.

Furthermore, according to the gas manifold 112 and the engine 100, by inserting the rectifying pipe 25 inside the deviation absorbing portion 23j, it is possible to prevent vortex or turbulent flow from occurring in the fuel passing through the deviation absorbing portion 23j bellows shape. .

In addition, although the engine 100 of this embodiment was set as the structure used as a motive power source of the ship 500, it is not limited to this. For example, it may be configured to be used as a power supply source (auxiliary machine) of the ship 500 or a power generation engine installed on land.

7 to 11, second to sixth embodiments of the double pipe configuration of the present invention will be described. The second to sixth embodiments of the double pipe configuration of the present invention are connection portions of gas pipes (gas manifold 112 or gas inlet pipe 113 or fuel supply path 121 or the like) of engine 100 of ship 500.

The configuration of the connection unit 50 will be described with reference to FIG.
In FIG. 7, the configuration of the connection unit 50 is schematically shown.

The connection unit 50 is a second embodiment of the double pipe configuration of the present invention. The connection part 50 shall connect double piping 51A and double piping 51D.

Suppose that in the double pipe 51A and the double pipe 51D, the fuel gas passes through the inner pipe, and the leaked fuel gas passes through the outer pipe when the fuel gas leaks from the inner pipe. In the unlikely event that gas leaks into the outside piping, the operator shall be notified by warning means such as lighting of a lamp, indicator, or warning sound.

In the following description, a surface parallel to the gas flow path is referred to as a side surface, and a surface perpendicular to the gas flow path is referred to as an end surface.

The double pipe 51A is configured such that an inner pipe (hereinafter referred to as an inner pipe 52A) is inserted in a state where a certain clearance is maintained with respect to an outer pipe (hereinafter referred to as an outer pipe 53A). A flange 55B is fixed to the end side of the double pipe 51A by welding. The flange 55B is formed with an inner hole 52B that communicates with the inner tube 52A and an outer hole 53B that communicates with the outer tube 53A.

A convex portion 56B as a fitting portion is formed on the flange 55B. The convex portion 56B is formed in a cylindrical shape. An inner hole 52B and an outer hole 53B are formed in the convex portion 56B. A groove portion 57 is formed around the side surface of the convex portion 56B as a seal portion. An O-ring is fitted. A groove portion 58 is formed as a seal portion between the inner hole 52B and the outer hole 53B on the end face side of the convex portion 56B, and an O-ring is fitted therein.

The double pipe 51D is configured such that an inner pipe (hereinafter referred to as an inner pipe 52D) is inserted in a state where a certain clearance is maintained with respect to an outer pipe (hereinafter referred to as an outer pipe 53D). A flange 55C is fixed to the end side of the double pipe 51D by welding. The flange 55C is formed with an inner hole 52C that communicates with the inner tube 52D and an outer hole 53C that communicates with the outer tube 53D.

A concave portion 56C as a fitting portion is formed in the flange 55C. The concave portion 56C is formed with a hollow cylindrical shape that fits into the convex portion 56B. An inner hole 52C and an outer hole 53C are formed in the recess 56C.

In the connecting portion 50, the convex portion 56B is fitted into the concave portion 56C, and the flange 55B and the flange 55C are joined by fastening the bolt B to the nut N. At this time, the flange 55B and the flange 55C are joined by connecting the inner hole 52B and the inner hole 52C, and connecting the outer hole 53B and the outer hole 53C.

In the connection part 50, the flow path that passes through the inner pipe (the inner pipe 52A, the inner hole 52B, the inner hole 52C, and the inner pipe 52D) is sealed by the groove part 58 in which the O-ring is fitted. Further, in the connection part 50, the flow path passing through the outer pipe (the outer pipe 53A, the outer hole 53B, the outer hole 53C, and the outer pipe 53D) is sealed by the groove part 57 in which the O-ring is fitted.

The effect of the connection part 50 is demonstrated.
According to the connection part 50, even if the bolt B and the nut N are loosened, the leakage of the

inner pipes

52A and 52D can be reliably prevented by the side seals.

The configuration of the connection unit 60 will be described with reference to FIG.
In addition, in FIG. 8, the structure of the connection part 60 is represented typically.

The connecting portion 60 is a third embodiment of the double pipe configuration of the present invention. The connection part 60 shall connect the double piping 61A and the double piping 61D. In the double pipe 61A and the double pipe 61D, the fuel gas passes through the inner pipe, and the fuel gas leaked when the fuel gas leaks from the inner pipe through the outer pipe.

The double pipe 61A is configured such that the inner pipe (hereinafter referred to as the inner pipe 62A) is inserted with the outer pipe (hereinafter referred to as the outer pipe 63A) holding a certain clearance. A flange 65B is fixed to the end side of the double pipe 61A by welding. In the flange 65B, an inner hole 62B communicating with the inner tube 62A and an outer hole 63B communicating with the outer tube 63A are formed.

The flange 65B has a first convex portion 66B as a first fitting portion. The first convex portion 66B is formed in a cylindrical shape. An inner hole 62B and an outer hole 63B are formed in the first convex portion 66B. Around the side surface of the first convex portion 66B, a groove portion 68 is formed as a seal portion, and an O-ring is fitted.

A second convex portion 67B as a second fitting portion is formed on the first convex portion 66B. The second convex portion 67B is formed in a cylindrical shape. An inner hole 62B is formed in the second convex portion 67B. Around the side surface of the second convex portion 67B, a groove portion 69 is formed as a seal portion, and an O-ring is fitted.

The double pipe 61D is configured such that an inner pipe (hereinafter referred to as an inner pipe 62D) is inserted in a state where a certain clearance is maintained with respect to an outer pipe (hereinafter referred to as an outer pipe 63D). A flange 65C is fixed to the end side of the double pipe 61D by welding. The flange 65C is formed with an inner hole 62C communicating with the inner tube 62D and an outer hole 63C communicating with the outer tube 63D.

A first recess 66C as a fitting portion is formed in the flange 65C. The first recess 66C is formed to be recessed in a cylindrical shape into which the first protrusion 66B is fitted. An inner hole 62C and an outer hole 63C are formed in the first recess 66C.

A second recess 67C as a fitting portion is formed in the first recess 66C. The second concave portion 67C is formed to be recessed in a cylindrical shape into which the second convex portion 67B is fitted. An inner hole 62C is formed in the second recess 67C.

In the connecting portion 60, the first convex portion 66B is fitted into the first concave portion 66C, the second convex portion 67B is fitted into the second concave portion 67C, and the flange 65B and the flange 65C are used to tighten the bolt B to the nut. Fastened to N and joined. At this time, the flange 65B and the flange 65C are joined by connecting the inner hole 62B and the inner hole 62C, and connecting the outer hole 63B and the outer hole 63C.

In the connection part 60, the flow path that passes through the inner pipe (the inner pipe 62A, the inner hole 62B, the inner hole 62C, and the inner pipe 62D) is sealed by a groove 69 in which an O-ring is fitted. Moreover, in the connection part 60, the flow path which passes outside piping (outer pipe 63A, outer hole 63B, outer hole 63C, and outer pipe 63D) is sealed by the groove part 68 in which the O-ring is fitted.

The effect of the connection part 60 is demonstrated.
According to the connection part 60, even if the bolt B and the nut N are loosened, the leakage of the

inner pipes

62A and 62D can be reliably prevented by the side seals.

The configuration of the connection unit 70 will be described with reference to FIG.
In addition, in FIG. 9, the structure of the connection part 70 is represented typically.

The connection unit 70 is a fourth embodiment of the double pipe configuration of the present invention. The connection unit 70 connects the double pipe 71A and the double pipe 71D. In the double pipe 71A and the double pipe 71D, the fuel gas passes through the inner pipe, and the fuel gas leaked when the fuel gas leaks from the inner pipe through the outer pipe.

The double pipe 71A is configured such that an inner pipe (hereinafter referred to as an inner pipe 72A) is inserted in a state where a certain clearance is maintained with respect to an outer pipe (hereinafter referred to as an outer pipe 73A). A flange 75B is fixed to the end side of the double pipe 71A by welding. In the flange 75B, an inner hole 72B communicating with the inner tube 72A and an outer hole 73B communicating with the outer tube 73A are formed.

The recess 75B as a fitting part is formed in the flange 75B. The recess 76B is formed to be recessed in a cylindrical shape. An inner hole 72B and an outer hole 73B are formed in the recess 76B.

The double pipe 71D is configured such that an inner pipe (hereinafter referred to as an inner pipe 72D) is inserted in a state where a certain clearance is maintained with respect to an outer pipe (hereinafter referred to as an outer pipe 73D). A flange 75C is fixed to the end side of the double pipe 71D by welding. The flange 75C is formed with an inner hole 72C communicating with the inner tube 72D and an outer hole 73C communicating with the outer tube 73D.

A recess 76C as a fitting portion is formed in the flange 75C. The recess 76C is formed to be recessed in a cylindrical shape. An inner hole 72C and an outer hole 73C are formed in the recess 76C.

The fitting member 76M is fitted into the recess 76B of the flange 75B and the recess 76C of the flange 75C. The fitting member 76M is formed in a cylindrical shape that fits into the recess 76B and the recess 76C. The fitting member 76M is formed with an inner hole 72M communicating with the inner hole 72B and the inner hole 72C and an outer hole 73M communicating with the outer hole 73B and the outer hole 73C.

溝 Groove portions

77 and 77 are formed as seal portions around the side surface of the fitting member 76M. An O-ring is fitted.

Groove portions

78 and 78 are formed as seal portions on both end surface sides of the fitting member 76M and between the inner hole 72M and the outer hole 73M, and O-rings are fitted.

In the connecting portion 70, the flange 75B and the flange 75C are joined by fitting the fitting member 76M and fastening the bolt B to the nut N. At this time, the flange 75B, the fitting member 76M, and the flange 75C are joined by connecting the inner hole 72B, the inner hole 72M, and the inner hole 72C, and connecting the outer hole 73B, the outer hole 73M, and the outer hole 73C. Is done.

In the connecting portion 70, the flow path passing through the inner piping (the inner pipe 72A, the inner hole 72B, the inner hole 72M, the inner hole 72C, and the inner pipe 72D) is sealed by the

grooves

78 and 78 into which the O-rings are fitted. Has been. Moreover, in the connection part 70, the flow path which passes outside piping (outer pipe 73A, outer hole 73B, outer hole 73M, outer hole 73C, and outer pipe 73D) is the

groove parts

77 and 77 in which the O-ring is fitted. Is sealed by.

The effect of the connection unit 70 will be described.
According to the connection part 70, even if the bolt B and the nut N are loosened, the leakage of the

inner pipes

72A and 72D can be reliably prevented by the side seals.

The configuration of the connection unit 80 will be described with reference to FIG.
In addition, in FIG. 10, the structure of the connection part 80 is represented typically.

The connecting portion 80 is a fifth embodiment of the double pipe configuration of the present invention. The connection unit 80 connects the double pipe 81A and the double pipe 81D. In the double pipe 81A and the double pipe 81D, the fuel gas passes through the inner pipe, and the fuel gas leaked when the fuel gas leaks from the inner pipe through the outer pipe.

The double pipe 81A is configured such that the inner pipe (hereinafter referred to as the inner pipe 82A) is inserted with the outer pipe (hereinafter referred to as the outer pipe 83A) maintaining a certain clearance. A flange 85B is fixed to the end side of the double pipe 81A by welding. The flange 85B is formed with an inner hole 82B that communicates with the inner tube 82A and an outer hole 83B that communicates with the outer tube 83A.

The flange 85B has a recess 86B as a fitting portion. The recess 86B is formed with a recessed ring shape. An outer hole 83B is formed in the recess 86B.

The double pipe 81D is configured such that an inner pipe (hereinafter referred to as an inner pipe 82D) is inserted in a state where a certain clearance is maintained with respect to an outer pipe (hereinafter referred to as an outer pipe 83D). A flange 85C is fixed to the end side of the double pipe 81D by welding. The flange 85C is formed with an inner hole 82C communicating with the inner tube 82D and an outer hole 83C communicating with the outer tube 83D.

A recess 86C as a fitting portion is formed in the flange 85C. The recess 86C is formed with a recessed ring shape. An outer hole 83C is formed in the recess 86C.

The fitting member 86M is fitted into the recess 86B of the flange 85B and the recess 86C of the flange 85C. The fitting member 86M is formed in a ring shape that fits into the recess 86B and the recess 86C. The fitting member 86M is formed with an outer hole 83M communicating with the outer hole 83B and the outer hole 83C.

溝 Groove portions

87 and 87 are formed as seal portions around the side surface of the fitting member 86M. An O-ring is fitted. On the end face side of the flange 85B and between the inner hole 82B and the recess 86B, a groove 88 is formed as a seal, and an O-ring is fitted.

In the connecting portion 80, the flange 85B and the flange 85C are joined by fitting the fitting member 86M and fastening the bolt B to the nut N. At this time, the flange 85B, the fitting member 86M, and the flange 85C are joined such that the inner hole 82B and the inner hole 82C communicate with each other, and the outer hole 83B, the outer hole 83M, and the outer hole 83C communicate with each other.

In the connection part 80, the flow path passing through the inner pipe (the inner pipe 82A, the inner hole 82B, the inner hole 82C, and the inner pipe 82D) is sealed by the groove part 88 in which the O-ring is fitted. Further, in the connecting portion 80, the flow passages that pass through the outer pipes (the outer pipe 83A, the outer hole 83B, the outer hole 83M, the outer hole 83C, and the outer pipe 83D) are

grooves

87 and 87 in which the O-rings are fitted. Is sealed by.

The effect of the connection unit 80 will be described.
According to the connection part 80, even if the bolt B and the nut N are loosened, the leakage of the

inner pipes

82A and 82D can be reliably prevented by the side seals.

The structure of the connection part 90 is demonstrated using FIG.
In addition, in FIG. 11, the structure of the connection part 90 is represented typically.

The connecting portion 90 is a sixth embodiment of the double pipe configuration of the present invention. The connection unit 90 connects the double pipe 91A and the double pipe 91D. In the double pipe 91 </ b> A and the double pipe 91 </ b> D, the fuel gas passes through the inner pipe, and the leaked fuel gas passes through the outer pipe when the fuel gas leaks from the inner pipe.

The double pipe 91A is configured such that an inner pipe (hereinafter referred to as an inner pipe 92A) is inserted in a state where a certain clearance is maintained with respect to an outer pipe (hereinafter referred to as an outer pipe 93A). A contact portion 96B is fixed to the end side of the double pipe 91A by welding. In the contact portion 96B, an inner hole 92B communicating with the inner tube 92A and an outer hole 93B communicating with the outer tube 93A are formed. A flange 95B is fixed to the outer periphery on the end side of the double pipe 91A by welding.

The double pipe 91D is configured such that an inner pipe (hereinafter referred to as an inner pipe 92D) is inserted in a state where a certain clearance is maintained with respect to an outer pipe (hereinafter referred to as an outer pipe 93D). A contact portion 96C is fixed to the end side of the double pipe 91D by welding. The contact portion 96C is formed with an inner hole 92C communicating with the inner tube 92D and an outer hole 93C communicating with the outer tube 93D. A flange 95C is fixed to the outer periphery on the end side of the double pipe 91D by welding.

The intermediate member 96M is formed in a substantially ring shape.

Around the side surface of the contact portion 96B, a groove portion 97 is formed as a seal portion. An O-ring is fitted. A groove part 97 is formed as a seal part around the side surface of the contact part 96C. An O-ring is fitted. A groove portion 98 is formed as a seal portion on the end face side of the contact portion 96B and between the inner hole 92B and the outer hole 93B, and an O-ring is fitted therein.

In the connecting portion 90, the flange 95B and the flange 95C are joined by fastening the bolt B to the nut N with the intermediate member 96M interposed therebetween. At this time, the flange 95B and the flange 95C are joined by connecting the inner hole 92B and the inner hole 92C, and connecting the outer hole 93B and the outer hole 93C.

In the connection part 90, the flow path passing through the inner pipe (the inner pipe 92A, the inner hole 92B, the inner hole 92C, and the inner pipe 92D) is sealed by the groove part 98 in which the O-ring is fitted. Further, in the connecting portion 90, the flow path passing through the outer pipe (the outer pipe 93A, the outer hole 93B, the outer hole 93C, and the outer pipe 93D) is sealed by the

grooves

97 and 97 into which the O-ring is fitted. Yes.

The effect of the connection unit 90 will be described.
According to the connection part 90, even if the bolt B and the nut N are loosened, the leakage of the

inner pipes

92A and 92D can be reliably prevented by the side seals.

In the above embodiment, the double pipe is configured as the gas pipe of the engine 100 of the ship 500, but the present invention is not limited to this. For example, the present invention can be applied to a piping for a ship and a toxic fluid.

In the present embodiment, the engine 100 is configured as a dual fuel engine, but is not limited thereto. For example, the present invention can also be applied to an engine using gas fuel such as a gas dedicated engine using only gas fuel.

The present invention can be used for an engine.

DESCRIPTION OF SYMBOLS 10 Branch pipe 11 Flange 12 Flange 13 Main pipe 14 Branch pipe 20 Connection pipe 21 Flange 22 Flange 30 Fixing member

Claims

One flange formed on the end side of one double pipe composed of an outer pipe and an inner pipe built in the outer pipe, and another formed on the end side of the other double pipe It is the structure of the double pipe which joins the flange and connects the one double pipe and the other double pipe,
The one flange and the other flange are fitted,
The fitting surface of the fitting portion is provided with a seal portion that seals the outer tube or the inner tube.
Double piping configuration.
It is the structure of the double piping of Claim 1, Comprising:
The one flange and the other flange are fitted by a first fitting portion and a second fitting portion formed in the first fitting portion,
A side surface of the first fitting portion is provided with a seal portion that seals the outer tube,
A seal portion for sealing the inner tube is provided on a side surface of the second fitting portion.
Double piping configuration.
It is the structure of the double piping of Claim 1, Comprising:
The one flange portion is configured to be slidable in the axial direction with respect to the one pipe.
Double piping configuration.
It is the structure of the double piping of Claim 3, Comprising:
The outer pipe and the inner pipe of the one pipe or the other pipe each include a deviation absorbing portion that absorbs an axial deviation.
Double piping configuration.
It is the structure of the double piping according to claim 3 or 4,
A fixing portion for fixing the axial position of the outer pipe of the one pipe and the one flange portion;
Double piping configuration.
An engine,
The double pipe configuration according to any one of claims 1 to 5,
engine.
A ship,
The double pipe configuration according to any one of claims 1 to 5,
Ship.