JPH09229278A - Two-pipe system joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a two-pipe system joint capable of using a rigid pipe to an outer pipe, halving the number of parts, reducing the weight, and miniaturizing the form. SOLUTION: Inner O-rings 3 are provided on the outer peripheral surfaces provided on the ends of inner pipes 1 to be connected to each other and having the diameters larger than those of outer pipes 7, outer O-rings 9 are provided on the outer peripheral surfaces provided on flanges 2 so arranged as to face to each other and on the end of outer pipes 7 to be connected to each other, and having the approximately same diameter of the inner flanges 2, the inner flanges 2, the outer flanges 1 so arranged as to face to each other, and passages 15 formed between the inner flanges 2 and the outer flanges 11 are provided inside a coupling, the inner O-rings 3 and the outer O-rings 9 are pressed by the inner peripheral surface, and sealing materials 14 for forming fluid passages for fluid between facing inner flanges 2, 2 and between the outer flanges 11, 11 are formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, in a fuel line or the like laid in a passenger cabin of a commercial aircraft, connects double pipes having a double structure to each other in order to prevent leakage of fuel flowing inside. For double pipe fittings for

[0002]

2. Description of the Related Art In a commercial aircraft having a fuel tank in its main wing, a fuel line for supplying fuel from a fuel tank to an engine must be installed in a passenger compartment. In the fuel line laid in such a cabin,
The inner pipe that allows the fuel to pass through the inside, and even if the fuel should flow out of the inner pipe, it prevents the fuel from flowing into the passenger compartment, and the fuel that has flowed into the interior is stored in a tank at a specified location. In order to discharge to the inside, a double pipe consisting of an outer pipe and a concentric outer pipe is used outside the inner pipe. Further, when different kinds of fluids are supplied or discharged through a narrow space, there may be used a double pipe in which an internal flow path and an external flow path are formed concentrically so as to individually flow the respective fluids.

FIG. 3 shows a conventional double pipe joint 013 which is used when both the inner pipe 01 and the outer pipe 06 are rigid pipes in such a double pipe.
It is sectional drawing and a perspective view which show an example. In this example, FIG.
As shown in the sectional view of the lower half of (a), a latch type is used for the joint of the inner pipe 01, and a thread type is used for the joint of the outer pipe 06 as shown in the sectional view of the upper half of the figure. To
The double piping joint 013 when applied respectively is shown.

As shown in the lower half of FIG. 3 (a), an inner flange 02 having a diameter larger than that of the inner pipe 01 is fixed or attached to each end of the inner pipe 01 to be connected. It is provided by body shaping. Inner O-rings are respectively inserted in the peripheral grooves formed on the outer peripheral surface of the inner flange 02, and the front surfaces are arranged so as to face each other.
A space is provided between the front surfaces. Further, the outer peripheral surface of the inner O-ring 03, which is arranged separately, has the inner O-ring 0
3, the inner O-ring 03 is surrounded by a sleeve 04 that fixes the inner O-ring 03 by pressing the outer peripheral surfaces of the inner O-rings 03 to make the inner pipe 01 fluid-tight.

On the outer peripheral surface of the sleeve 04, there is provided a shell 05 for fixing the sleeve 04 and connecting both inner pipes 01 (inner flange 02). The shell 05 has a two-part structure, and the hook is engaged to press the outer peripheral surface of the sleeve 04 so that the inner peripheral surface of the sleeve 04 is in pressure contact with the inner O-ring 03.

Next, as shown in the upper half of FIG.
An outer flange 07 having a diameter larger than that of the outer pipe 06 is fixed or formed on each end of the outer pipe 06 to be connected, and the outer flange 07 is arranged so as to face each other from the rear side of the inner flange 02 that is arranged to face each other. ing. This outer flange 07
The outer O-ring 08 is also fitted in the circumferential groove formed on the outer circumference of the.

A flow path between the outer O-rings 08 is formed in the outer peripheral portion between the outer O-rings 08, and
A body 09 is provided that presses the outer peripheral surface of the outer O-ring 08 to make the outer peripheral fluid passage formed by the inner peripheral surface of the outer pipe 06 and the outer peripheral surface of the inner pipe 01 including the joint fluid-tight. . One end of the body 09 is engaged with the outside of the protrusion of the outer flange 07 that forms a peripheral groove via the retainer 010, and the outer peripheral surface on the other end side is threaded to form a retainer 010. Via the outer groove of the outer flange 07 on the other side, the front surface of the inner peripheral portion engages with the outer surface of the projection that forms the peripheral groove. While keeping the passage fluid-tight,
The outer flanges 07 arranged so as to face each other are connected.

The double pipe joint 0 thus formed
12 is, as is clear from the perspective view shown in FIG.
Since it is necessary to provide individual joints composed of a large number of parts at the connection ends of the inner pipe 01 and the outer pipe 06 for connection, the number of parts is increased and the weight is increased. Furthermore, since the shape of the joint of the outer pipe 06 must be determined so that the joint of the inner pipe 01 fits inside and the external fluid passage is formed outside the inner pipe joint, it is inevitable that the joint of the outer pipe 06 is doubled. Pipe fitting 0
The size of 12 becomes large and there is a problem that it becomes long.

Next, in FIG. 4, in the double pipe, a rigid pipe is used for the inner pipe 01, a flexible pipe is used for the outer pipe 013, and a band clamp 014 is used for the joint of the outer pipe 013. Of the double pipe joint 020, which is designed to increase the
It is a perspective view which shows the other example of. In this example, FIG.
As shown in FIG. 3, the joint of the inner pipe 01 uses the same parts as the joint of the inner pipe 01 shown in FIG. 3 and has the same structure. The sleeve 04 shown in FIG. 3 is omitted in the drawing for easy understanding.

Also, one outer pipe 013 for connection is provided.
Of the inner diameter of the joint part of the inner pipe 01,
The inner diameter is larger than the diameter of the shell 05, and a fitting surface 014 is formed on the outer peripheral surface. Furthermore, at the end of the other outer pipe 013 for connection, a fitting surface 016 for fitting the above-mentioned fitting surface 014 is formed on the inner peripheral surface, and a narrowing portion 017 is formed on the outer peripheral surface of the fitting surface 016. Has been formed.

Since the end portion of the outer pipe 013 to be connected is formed in this manner, the fitting surface 014 of one outer pipe 013 is arranged with a gap from the outer peripheral surface of the joint of the inner pipe 01. Also, the fitting surface 016 of the other outer pipe 013
, And both outer pipes 013 are fluid-tightly connected to each other on the outer circumference of the joint of the inner pipe 01 by inserting the clamp portion 017 into the clamp 015. Further, a fitting 019 for fixing the double pipe to the structure 018 is provided on the outer periphery of the other outer pipe 013 having the narrowed portion 017 on the outer peripheral surface.

As described above, in the double pipe joint 020 in which the flexible pipe is used for the outer pipe 013, the number of parts is as desired as compared with the double pipe joint shown in FIG. 3 described above. Less, less weight gain,
There is also an advantage that the envelope can be reduced.

However, such a double pipe joint 0
20, the inner peripheral surface of the joint of the outer pipe 013 and the inner pipe 0
Since a gap is provided between the outer peripheral surface of the joint No. 1 and the external fluid passage, the diameter and length of the double pipe joint 020 cannot be made sufficiently small, and the reduction of the envelope is insufficient. Since the pipe 013 is made of a flexible material and is supposed to secure the fluidity due to the drawing deformation, the double pipe is attached to the ceiling or wall of the cabin of the aircraft as shown in FIG. However, problems such as difficulty in support and unsuitability for application to high-voltage systems occur.

That is, as shown in FIG. 5, a structure 019 such as a wall or a ceiling is attached to a double pipe by a supporting clamp 021.
When attempting to support the above, the outer pipe 013 is pressed from the outer periphery by the support clamp 021 to crush and close the external fluid passage, so that such a situation does not occur at the time of fitting. Since it is necessary to mount it, the mounting becomes difficult and the mounting force becomes insufficient. Further, when the high-pressure fluid is allowed to flow through the external fluid passage, it is necessary to attach the outer pipe 013 so as to prevent the outer pipe 013 from locally expanding. Furthermore, because of the flexible piping, the pressure of the flowing fluid can be changed as in the case of rigid piping.
There are some problems that cannot be raised. In FIG. 5, 02
2 is a washer and 023 is a bolt.

[0015]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the conventional double pipe joint, so that the number of parts constituting the joint can be reduced and the outer shape of the joint can be reduced. Also, without using flexible piping for the outer piping, use rigid piping, do not limit the working pressure, and handle the support structure during fitting as well as ordinary single piping. It is an object of the present invention to provide a double pipe joint capable of performing the above.

[0016]

Therefore, the double pipe joint of the present invention has the following means.

(1) An inner flange, which is concentrically provided on the outer side of the inner pipe and has a diameter larger than the diameter of the outer pipe and has an inner O-ring mounted on the outer peripheral surface, is provided at each end of the inner pipe to be connected. The front surfaces of the inner flanges provided on the respective inner pipes to be connected are arranged so as to face each other.

(2) An outer flange having substantially the same outer diameter as the inner flange is provided at each end of the outer pipes to be connected, and between the end of each inner pipe to be connected and the back face of each inner flange. A gap was provided and the front surfaces were arranged so as to face each other.

(3) Flow paths that open respectively between the back surfaces of the respective inner flanges that are arranged to face each other and the front surfaces of the respective outer flanges that are arranged to face the back surface of the inner flange with a gap therebetween. Are bored inside, and the outer peripheral surface of the inner O-ring mounted on the outer peripheral surface of the inner flange and the outer peripheral surface of the outer O-ring mounted on the outer peripheral surface of the outer flange are pressed against each other on the inner peripheral surface. A sealing material was provided to keep the inside of the O-rings and the outside of the O-rings whose fronts communicate with each other in a fluid-tight manner.

The sealing material has a flow channel formed therein,
A sleeve may be used in which the inner peripheral surface presses the outer peripheral surface of each of the inner O-ring and the outer O-ring and the shell is pressed against the outer peripheral surface. A shell may be used in which the outer peripheral surfaces of the inner O-ring and the outer O-ring are directly in pressure contact with each other and fixed to the outer peripheral surface of the outer pipe.

That is, a passage communicating with the inside of the inner pipe is formed between the inner flanges arranged to face each other, and the inner peripheral surface is pressed against the outer peripheral surface of the inner O-ring, so that the inner pipe is separated from the inner pipe. Prevents leakage into the outer pipe,
In addition, a passage communicating with the outer passage formed by the outer peripheral surface of the inner passage and the inner peripheral surface of the outer pipe is provided between the outer flanges arranged opposite to each other behind the opening of the flow passage behind the inner flange. It is formed with the flow path and the inner peripheral surface is pressed against the outer peripheral surface of the outer O-ring to prevent leakage from the outer passage to the inside of the inner pipe or the outside of the outer pipe.

According to the double pipe joint of the present invention, by the above-mentioned means, the inner pipe and the outer pipe each have an inner flange provided with an inner O-ring at each end,
Since the outer flange having the outer O-ring and the outer flange can be connected to each other by the sealing material having the passage formed therein, the number of parts of the joint can be significantly reduced and the increase in weight can be reduced.

Further, the diameter of the joint does not increase much more than the outer diameter of the outer pipe, the joint can be installed in a narrow space, and the amount of protrusion from the wall, ceiling, etc. where the double pipe is laid can be reduced. , It becomes possible to effectively use the space near the installation. Furthermore, even if the outer pipe is a rigid pipe, there is no problem, and the problems that occur when forming the outer pipe with flexible piping can be eliminated, and double pipes can be easily attached to structures and the like. There is less pressure limitation of the fluid flowing inside.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the double pipe joint of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing a first embodiment of a double pipe joint of the present invention, and an upper half portion above a center line is a longitudinal sectional view, and a lower half portion is a side view partially broken.

In the figure, reference numeral 1 is an inner pipe, and inner pipe 1
The inner flange 2 is fixed to the end on the side where the connection is made. The inner flange 2 may be formed integrally with the inner pipe 1 at the end of the inner pipe 1.
Further, the inner flange 2 has a flange portion 5 having a diameter larger than that of an outer pipe 6, which will be described later, and a peripheral groove 4 provided on the outer peripheral surface to which the inner O-ring 3 is attached.
The inner flange 2 thus formed is arranged with a front surface 6 of the collar portion 5 with a gap, and the front surfaces 6 face each other.

Reference numeral 7 denotes an outer pipe which forms a double pipe by interposing a spacer 13 which is divided in the circumferential direction between the inner pipe 1 and the outer peripheral surface of the inner pipe 1 and which forms a double pipe. An outer flange 8 is fixed to or integrally formed with the end portion on the side of connection. The outer flange 8 has a diameter substantially the same as that of the inner flange 2 described above, and the outer O-ring 9 is mounted on the outer peripheral surface of the flange portion 1 provided with the circumferential groove 10.
1 is formed at the end. Also, the outer flange 8 is
The front surface 12 is spaced from the back surface of the collar portion 5 of the inner flange 2 and is arranged to face each other.

Reference numeral 14 is a sleeve as a sealing material which encloses the outer peripheries of the inner flange 2 and the outer flange 8 which are arranged to face each other. The sleeve 14 is provided with openings between the back surface of the collar portion 5 of the inner flange 2 and the front surface 12 of the collar portion 11 of the outer flange 8, and a flow passage 15 for allowing the agent to pass therethrough penetrates inside. Is provided.

Further, the inner peripheral surface of the central portion inside the opening of the flow path 15 of the sleeve 14 is in contact with the outer peripheral surface of the inner O-ring 3, and the inner flow path wall between the inner flange front surfaces 6 arranged to face each other. And the internal flow path 1 in the inner pipe 1
It is possible to prevent the outflow of the agent flowing in 8 or the inflow of the agent from the outer flow path 19 formed by the outer peripheral surface of the inner pipe 1 and the inner peripheral surface of the outer pipe 7. Furthermore, the sleeve 1
The inner peripheral surface of the end portion outside the opening of the flow path 15 of 4 contacts the outer peripheral surface of the outer O-ring 9 to form an outer flow path wall between the outer flange front surfaces 12 that are similarly arranged to face each other. The outflow of the agent flowing through the external flow path 19 is prevented.

Reference numeral 16 presses the outer peripheral surface of the sleeve 14 to keep the inner peripheral surface of the sleeve 14 and the outer peripheral surfaces of the inner O-ring 3 and the outer O-ring 8 in close contact with each other, and both ends are opposed to each other. It is a shell that fits on the back surface of the flange portion 11 of the arranged outer flange 8 and connects the flange portion 5 of the inner pipe and the flange portion 11 of the outer pipe 1 that are arranged to face each other. As shown in FIG. 3 (b), the shell 16 is split in two, and by engaging the hooks, the sleeve 14
The outer peripheral surface of can be pressed. Reference numeral 17 denotes a body that reinforces the shell 16 by engaging both ends with the outer peripheral surface of the shell 16.

Since the present embodiment is constructed as described above, the number of parts constituting the double pipe joint 20 is almost equal to that of the conventional double pipe joint 013 shown in FIG. Halve. Furthermore, the external flow path provided in the double pipe joint 20 is provided by being bored in the sleeve 14 and the like, so that the diameter of the double pipe joint 20 can be made small and the axial length can be made short. Further, the outer pipe 7 can be adopted even if it is a rigid pipe, which facilitates attachment at the time of outfitting and allows a high-pressure agent to flow to the external flow path.

Next, FIG. 2 is a sectional view showing a second embodiment of the double pipe joint of the present invention. In the double pipe joint 30 of the present embodiment, instead of the sleeve 14, the shell 16 and the body 17 provided in the double pipe joint 20 shown in FIG. . That is, the body 21 is provided with openings between the back surface of the collar portion 5 of the inner flange 2 and the front surface 12 of the collar portion 11 of the outer flange 8, and the flow passage 15 for allowing the agent to pass therethrough.
Is provided so as to penetrate therethrough.

The inner peripheral surface of the central portion of the body 21 inside the opening of the flow path 15 contacts the outer peripheral surface of the inner O-ring 3 to form an internal flow path wall between the inner flange front surfaces 6.
The outflow of the agent flowing through the internal flow path 18 in the inner pipe 1 or the inflow of the agent flowing through the external flow path 19 is prevented, and the inner peripheral surface of the end portion of the sleeve 14 outside the flow path 15 is formed into the outer O-ring 9 Abut the outer peripheral surface of
An external flow path wall is formed between the outer flange front surface 12 to prevent the agent flowing through the external flow path 19 from flowing out.

A circumferential groove 22 is provided on the inner circumference of one end of the body 21, and the retainer 23 fitted in the circumferential groove 22 is engaged with the back surface of the flange portion 11 of the outer flange 8. ing. On the other hand, a thread groove 24 is cut on the outer periphery of the other end of the body 21, and a rear surface of the flange portion 11 on the other side of the outer flange 8 and a nut 25 having a front surface engaged with a retainer 23 are engaged. The flange portion 5 of the inner pipe and the flange portion 11 of the outer pipe 1, which are arranged to face each other by being screwed with the thread groove 24, are firmly connected to each other.

Since the double pipe joint 30 of the present embodiment is constructed as described above, the same operation and effect as those of the first embodiment can be obtained, and the parts constituting the double pipe joint 30 are obtained. The number of points can be further reduced, and there is an advantage that the double pipe joint 30 can be easily assembled and opened.

[0035]

As described above, according to the double pipe joint of the present invention, the configuration of the claims makes it possible to reduce the outer diameter of the double pipe joint, thereby reducing the envelope of the joint, and providing the fitting. The degree of freedom in space is expanded, the range of application is expanded, and the number of parts is reduced, which contributes to weight reduction and makes assembly and opening extremely easy.
Also, with regard to pressure resistance and handleability during fitting, it can be handled in the same way as ordinary single-pipe joints, which facilitates work and prevents the fluid passage from being closed due to careless handling. .

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of a double pipe joint of the present invention, in which an upper half portion of FIG. 1 is a longitudinal sectional view, and a lower half portion is a side view partially broken away;

FIG. 2 is a sectional view showing a second embodiment of the double pipe joint of the present invention,

FIG. 3 is a view showing an example of a conventional double pipe joint, and FIG.
The upper half of (a) is a sectional view of the joint of the outer pipe, the lower half is a sectional view of the joint of the inner pipe, and FIG. 3 (b) is an exploded perspective view of the joint shown in FIG. 3 (a).

FIG. 4 is an exploded perspective view showing another example of a conventional double pipe joint,

5 is a diagram showing the double pipe shown in FIG. 4 attached to a structure.

[Explanation of symbols]

 1 Inner Pipe 2 Inner Flange 3 Inner O-Ring 4 Circumferential Groove 5 Collar 6 Inner Flange Front 7 Outer Pipe 8 Outer Flange 9 Outer O-Ring 10 Circumferential Groove 11 Collar 12 Outer Flange Front 13 Spacer 14 Sleeve 15 Channel 16 Shell 17 Body 18 Internal flow passage 19 External flow passage 20 Double pipe joint 21 Body 22 Circumferential groove 23 Retainer 24 Screw groove 25 Nut 30 Double pipe joint

Claims (1)

[Claims] 1. A double pipe connection in which inner pipes and outer pipes having different diameters are concentrically arranged, and flow paths are provided inside the inner pipe and between the inner pipe and the outer pipe, respectively. In the heavy pipe joint, inner O-rings are provided on the outer peripheral surfaces of the inner pipes to be connected, each of which has a diameter larger than that of the outer pipe, and inner flanges that are arranged to face each other and outer pipes to be connected. An outer O-ring is provided at an end portion and has an outer peripheral surface having substantially the same diameter as the inner flange, an outer O-ring is provided, a space is provided between the outer flange and the back surface of the inner flange, and the outer flange and the back surface of the inner flange are arranged to face each other. And a flow path which opens respectively between the front surface of the outer flange and the front surface of the outer flange, and the inner peripheral surfaces of the inner O ring and the outer O ring are provided so as to be in pressure contact with each other and face each other. Inside O A double pipe joint comprising: a sealing material that fluid-tightly connects between the rings and between the outer O-rings.