JP2020133721A - Double pipe joint structure - Google Patents

Abstract

To surely prevent fluid flowing in a pipe from flowing outward.SOLUTION: A double pipe joint structure 1 comprises: an outside pipe 10 having a first outside pipe 11, a first outside sleeve 15, a second outside pipe 12, a second outside sleeve 17, and a third outside pipe 13; and an inside pipe 20 having a first inside pipe 21, a first inside sleeve 25, a second inside pipe 22, a second inside sleeve 26, and a third inside pipe 23. The first outside pipe 11 and the first inside pipe 21 are connected, the second outside pipe 12 and the second inside pipe 22 are connected, and the third outside pipe 13 and the third inside pipe 23 are connected. The first outside tube 11 and the second outside tube 12 are connected to each other by a first hinge structure 45A, and the second outside tube 12 and the third outside tube 13 are connected to each other by a second hinge structure 47A.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a joint structure having one pipe, the other pipe, and a sleeve connecting these one pipe and the other pipe, and in particular, the fluid flowing through one pipe and the other pipe flows out. The present invention relates to a double pipe joint structure, which can prevent external fluid from flowing into the pipe.

Conventionally, a joint structure having one pipe, the other pipe, and a sleeve connecting these one pipe and the other pipe has been known.

Further, one pipe and the sleeve and the other pipe and the sleeve are sealed by a seal rubber ring.

In such a joint structure, various fluids are conveyed such as sending out drainage or the like.

By the way, the joint structure having such a structure may shift due to aging due to the influence of an earthquake or the like.

When the joint structure is displaced, it is conceivable that the fluid flowing in one pipe and the other pipe leaks to the outside.

Japanese Unexamined Patent Publication No. 3-285137 Japanese Unexamined Patent Publication No. 2005-91215 Japanese Unexamined Patent Publication No. 2004-53317 Japanese Unexamined Patent Publication No. 2004-10355

This disclosure has been made in consideration of such a point, and it is possible to surely prevent the fluid flowing in the pipe from leaking, and the external fluid does not flow into the pipe. It is an object of the present invention to provide a heavy pipe joint structure.

In the present disclosure, the first outer tube, the second outer tube, the third outer tube, the first outer sleeve connecting the first outer tube and the second outer tube, the second outer tube and the said. The outer pipe having the second outer sleeve connecting the third outer pipe, the first inner pipe, the second inner pipe, the third inner pipe, and the first inner pipe and the second inner pipe are connected. An inner pipe having a first inner sleeve and a second inner sleeve connecting the second inner pipe and the third inner pipe is provided, and the inner pipe is arranged in the outer pipe and the first The outer pipe and the first inner pipe are connected, the second outer pipe and the second inner pipe are connected, the third outer pipe and the third inner pipe are connected, and the first outer pipe and the said The second outer tube has a first hinge portion connected to each other to form a first hinge structure, and the second outer tube and the third outer tube are connected to each other to form a second hinge structure. It is a double pipe joint structure having a second hinge portion, respectively.

In the present disclosure, the pair of first hinge portions of the first hinge structure can rotate with each other and can move in the axial direction, and the pair of second hinge portions of the second hinge structure can rotate with each other. It is a double pipe joint structure that can be moved in the axial direction.

In the present disclosure, the first outer tube and the second outer tube are fitted to the inner surface of the first outer sleeve, and the second outer tube and the third outer tube are fitted to the inner surface of the second outer sleeve. It is a double pipe joint structure that fits.

In the present disclosure, the first inner tube and the second inner tube are fitted to the inner surface of the first inner sleeve, and the second inner tube and the third inner tube are fitted to the inner surface of the second inner sleeve. It is a double pipe joint structure.

In the present disclosure, the first outer tube and the first inner tube are connected via a first connecting body, the second outer tube and the second inner tube are connected via a second connecting body, and the first The 3 outer pipe and the 3rd inner pipe have a double pipe joint structure in which they are connected via a third connecting body.

As described above, according to the present disclosure, it is possible to reliably prevent the fluid flowing in the inner pipe from leaking, and the external fluid does not flow into the inner pipe.

FIG. 1 is a side sectional view showing an outline of an embodiment of a double pipe joint structure according to the present disclosure. FIG. 2A is a diagram showing the operation of the double pipe joint structure according to the present disclosure. FIG. 2B is a diagram showing the operation of the double pipe joint structure according to the present disclosure. FIG. 3 is a schematic view showing a first hinge structure and a second hinge structure of the double pipe joint structure according to the present disclosure. FIG. 4 is a diagram showing a connection structure between the first outer tube and the first outer sleeve. FIG. 5 is a diagram showing a connection structure between the first inner tube and the first inner sleeve.

Hereinafter, embodiments of the double pipe joint structure according to the present disclosure will be described with reference to FIGS. 1 to 5.

Here, FIG. 1 is a side sectional view showing the double pipe joint structure according to the present disclosure, FIGS. 2A and 2B are views showing the operation of the double pipe joint structure according to the present disclosure, and FIG. 3 is a first hinge structure. A schematic view showing a second hinge structure, FIG. 4 is a view showing a connection structure between the first outer tube and the first outer sleeve, and FIG. 5 is a view showing a connection structure between the first inner tube and the first inner sleeve. Is.

Further, FIGS. 1, 2A and 2B simplify the connection structure between the first outer tube, the second outer tube and the third outer tube, and the first outer sleeve and the second outer sleeve. Moreover, the connection structure between the first inner pipe, the second inner pipe and the third inner pipe, and the first inner sleeve and the second inner sleeve is shown in a simplified manner.

As shown in FIGS. 1 to 5, the double pipe joint structure 1 has a cylindrical first outer pipe 11, a cylindrical second outer pipe 12, a cylindrical third outer pipe 13, and a first outer pipe. An outer pipe 10 having a cylindrical first outer sleeve 15 connecting the pipe 11 and the second outer pipe 12 and a cylindrical second outer sleeve 17 connecting the second outer pipe 12 and the third outer pipe. , Cylindrical first inner tube 21, cylindrical second inner tube 22, cylindrical third inner tube 23, and cylindrical first tube 21 connecting the first inner tube 21 and the second inner tube 22. It includes an inner sleeve 25 and an inner pipe 20 having a cylindrical second inner sleeve 26 connecting the second inner pipe 22 and the third inner pipe 23.

Of these, the inner pipe 20 is arranged in the outer pipe 10. Further, the first outer tube 11 and the second outer tube 12 are fitted to the inner surface of the first outer sleeve 15. Further, the second outer pipe 12 and the third outer pipe 13 are fitted to the inner surface of the second outer sleeve 17. Further, the first inner tube 21 and the second inner tube 22 are fitted to the inner surface of the first inner sleeve 25, and the second inner tube 22 and the third inner tube 23 are fitted to the inner surface of the second inner sleeve 26. ing.

Further, the first outer pipe 11 and the first inner pipe 21 are arranged in the first outer pipe 11, for example, and a first such as a disk-shaped first connecting plate 5 orthogonal to the axis of the first outer pipe 11. They are connected to each other via a connector.
Further, the second outer pipe 12 and the second inner pipe 22 are arranged in, for example, the second outer pipe 12, and the second connecting plate 6 such as a disk-shaped second connecting plate 6 orthogonal to the axis of the second outer pipe 12 is connected. They are connected to each other through the body.

Further, the third outer pipe 13 and the third inner pipe 23 are arranged in the third outer pipe 13, for example, and a third such as a disk-shaped third connecting plate 7 orthogonal to the axis of the third outer pipe 13. They are connected to each other via a connector.

Since the first outer pipe 11 and the first inner pipe 21 are connected via the first connecting plate 5 in this way, the first inner pipe 21 is held at a predetermined position in the first outer pipe 11. Further, since the second outer pipe 12 and the second inner pipe 22 are connected via the second connecting plate 6, the second inner pipe 22 is held at a predetermined position in the second outer pipe 12.

Further, since the third outer pipe 13 and the third inner pipe 23 are connected via the third connecting plate 7, the third inner pipe 23 is held at a predetermined position in the third outer pipe 13.

Next, the connection structure between the first outer tube 11 and the first outer sleeve 15, the connection structure between the second outer tube 12 and the first outer sleeve 15, the second outer tube 12 and the second outer sleeve 17 The connection structure of the third outer tube 13 and the connection structure of the third outer tube 13 and the second outer sleeve 17 will be described.

The connection structure between the first outer tube 11 and the first outer sleeve 15, the connection structure between the second outer tube 12 and the first outer sleeve 15, the second outer tube 12 and the second outer sleeve 17 Since the connection structure of the third outer tube 13 and the connection structure of the second outer sleeve 17 are substantially the same, here, the connection structure between the first outer tube 11 and the first outer sleeve 15 is described. This will be described with reference to FIG.

As shown in FIG. 4, the first outer sleeve 15 has a protruding portion 15a projecting outward in the radial direction at the end on the side of the first outer tube 11. A seal rubber ring 16 that comes into contact with the protruding portion 15a of the first outer sleeve 15 is provided on the outer surface of the first outer pipe 11.

Further, the housing 18 for the seal rubber ring is attached so as to cover the seal rubber ring 16 provided on the outer surface of the first outer tube 11. The housing 18 for the seal rubber ring holds the seal rubber ring 16 at a predetermined position on the outer surface of the first outer tube 11, and the seal rubber ring 16 enhances the sealing property between the first outer tube 11 and the first outer sleeve 15. It is a thing. Such a sealing rubber ring housing 18 has a plurality of divided portions 18a along the circumferential direction, and each divided portion 18a is fixed by a fastening bolt 19.

Next, the connection structure between the first inner tube 21 and the first inner sleeve 25, the connection structure between the first inner sleeve 25 and the second inner tube 22, and the second inner tube 22 and the second inner sleeve 26. The connection structure between the second inner sleeve 26 and the third inner pipe 23 will be described.

The connection structure between the first inner tube 21 and the first inner sleeve 25, the connection structure between the first inner sleeve 25 and the second inner tube 22, and the second inner tube 22 and the second inner sleeve 26. Since the connection structure between the two inner sleeves 26 and the connection structure between the second inner sleeve 26 and the third inner pipe 23 have the same structure, here, between the first inner pipe 21 and the first inner sleeve 25. The connection structure will be described with reference to FIG.

As shown in FIG. 5, the first inner sleeve 25 has a protruding portion 25a protruding outward in the radial direction at the end on the side of the first inner pipe 21. A seal rubber ring 28 that comes into contact with the protruding portion 25a of the first inner sleeve 25 is provided on the outer surface of the first inner pipe 21.

Further, the housing 31 for the seal rubber ring is attached so as to cover the seal rubber ring 28 provided on the outer surface of the first inner pipe 21. The housing 31 for the seal rubber ring holds the seal rubber ring 28 at a predetermined position on the outer surface of the first inner tube 21, and the seal rubber ring 28 enhances the sealing property between the first inner tube 21 and the first inner sleeve 25. It is a thing. Such a seal rubber ring housing 31 has a plurality of divided portions 31a along the circumferential direction, and each divided portion 31a is fixed by a fastening bolt 32.

Further, as shown in FIGS. 1, 2A and 2B, the first inner pipe 21 is composed of a plurality of portions connected via the flange 21a, and the second inner pipe 22 is also composed of a plurality of portions connected via the flange 22a. Become. Further, the third inner pipe 23 is also composed of a plurality of portions connected via the flange 23a.

By the way, as shown in FIG. 1, the first outer pipe 11 and the second outer pipe 12 of the outer pipe 10 are connected to each other via the first hinge structure 45A. Further, the second outer pipe 12 and the third outer pipe 13 are connected to each other via the second hinge structure 47A. Here, the configurations of the first hinge structure 45A and the second hinge structure 47A of the outer pipe 10 are shown in FIG.

FIG. 3 is a schematic view showing a first hinge structure 45A and a second hinge structure 47A.

In FIG. 3, the first outer pipe 11 and the second outer pipe 12 of the outer pipe 10 are connected to each other via the first hinge structure 45A. Specifically, the first outer tube 11 has a first hinge portion 45 having an elongated hole 45a extending in the axial direction, and the second outer tube 12 has a first hinge having a pin 46a inserted in the elongated hole 45a. By having the portion 46 and inserting the pin 46a of the first hinge portion 46 into the elongated hole 45a of the first hinge portion 45, the first hinge portions 45 and 46 can rotate with each other and in the axial direction. It is movably connected. The first hinge structure 45A that connects the first outer tube 11 and the second outer tube 12 is configured by the first hinge portions 45 and 46 that are rotatably and movably connected in the axial direction.

Further, the second outer pipe 12 and the third outer pipe 13 of the outer pipe 10 are connected to each other via the second hinge structure 47A. Specifically, the third outer tube 13 has a second hinge portion 47 having an elongated hole 47a, and the second outer tube 12 has a second hinge having a pin 48a inserted in the elongated hole 47a extending in the axial direction. By having the portion 48 and inserting the pin 48a of the second hinge portion 48 into the elongated hole 47a of the second hinge portion 47, the second hinge portions 47 and 48 can rotate with each other and in the axial direction. It is movably connected. A second hinge structure 47A that connects the second outer pipe 12 and the third outer pipe 13 is configured by the second hinge portions 47, 48 that are rotatably and movably connected in the axial direction.

By the way, in FIG. 3, the first hinge structure 45A and the second hinge structure 47A are both rotatable about a pin 46a and a pin 48a extending in the horizontal direction.

Next, the operation of the present embodiment having such a configuration will be described with reference to FIGS. 1 to 5.

First, the double pipe joint structure 1 described above is installed in a building structure. Of these, the fluid flows into the inner pipe 20, but the fluid does not flow into the outer pipe 10. The outer pipe 10 has a function of preventing the leaked fluid from flowing to the outside when the fluid in the inner pipe 20 leaks. Such a double pipe joint structure 1 is displaced in the axial direction or the direction orthogonal to the axial direction (eccentric direction), that is, in the vertical direction shown in FIGS. 1, 2A and 2B due to an earthquake or aging.

First, FIGS. 1 and 2A show the reference shape of the double pipe joint structure 1. The double pipe joint structure 1 deviates from the state of the reference shape along the axial direction and the direction orthogonal to the axial direction. Specifically, the first outer pipe 11 on one pipe side and the third outer pipe 13 on the other pipe side are separated from each other along the axial direction, and the third outer pipe is separated from the first outer pipe 11. 13 descends (see FIG. 2B).

Further, the first inner pipe 21 on one pipe side and the third inner pipe 23 on the other pipe side are separated from each other along the axial direction, and the third inner pipe 23 descends with respect to the first inner pipe 21.

At this time, on the outer pipe 10 side, the first outer pipe 11 and the second outer pipe 12 slide on the inner surface of the first outer sleeve 15, and the second outer pipe 12 and the third outer pipe 13 are the second outer sleeve. It slides on the inner surface of 17, and absorbs the deviation of the double pipe joint structure 1 in the axial direction and the direction orthogonal to the axial direction.

Similarly, on the inner pipe 20 side, the first inner pipe 21 and the second inner pipe 22 slide on the inner surface of the first inner sleeve 25, and the second inner pipe 22 and the third inner pipe 23 are the second inner sleeve 26. It slides on the inner surface and absorbs the deviation of the double pipe joint structure 1 in the axial direction and the direction orthogonal to the axial direction.

During this time, as shown in FIGS. 1, 2A and 2B, since the first inner pipe 21 is connected to the first outer pipe 11, the first inner pipe 21 does not fall in the first outer pipe 11. It is held in a predetermined position in the first outer tube 11.
Further, since the second inner pipe 22 is connected to the second outer pipe 12, the second inner pipe 22 does not fall in the second outer pipe 12 and is held at a predetermined position in the second outer pipe 12. To.

Further, since the third inner pipe 23 is connected to the third outer pipe 13, the third inner pipe 23 does not fall in the third outer pipe 13 and is held at a predetermined position in the third outer pipe 13. To.

Furthermore, on the outer pipe 10 side, the first outer pipe 11 and the second outer pipe 12 have a first hinge structure 45A composed of first hinge portions 45, 46 that are rotatably and movably connected in the axial direction. Since they are connected to each other by the first hinge structure 45A, the deviation in the axial direction can be absorbed by the first hinge structure 45A, and the first outer pipe 11 and the second outer pipe 12 are surely connected by the first hinge structure 45A. be able to.

Further, since the second outer pipe 12 and the third outer pipe 13 are connected to each other by a second hinge structure 47A composed of second hinge portions 47, 48 which are rotatably and movably connected in the axial direction. The deviation in the axial direction can be absorbed by the second hinge structure 47A, and the second outer pipe 12 and the third outer pipe 13 can be reliably connected by the second hinge structure 47A. Further, the first outer pipe 11 and the second outer pipe 12 are rotatably connected by the first hinge structure 45A, and the second outer pipe 12 and the third outer pipe 13 are also rotatably connected by the second hinge structure 47A. Has been done. Therefore, the vertical deviation (see FIG. 1) orthogonal to the axial direction between the first outer pipe 11 and the third outer pipe 13 is also absorbed by the first hinge structure 45A and the second hinge structure 47A. Can be done.

Further, even if water leaks between the inner pipe 20 such as the first inner pipe 21 and the first inner sleeve 25, the outflowing fluid enters the space 1A between the first connecting plate 5 and the second connecting plate 6. stay. In this case, since the first outer pipe 11, the second outer pipe 12, and the first outer sleeve 15 are sealed by the seal rubber ring 16, the space between the first connecting plate 5 and the second connecting plate 6 is reached. The fluid that has flowed out into the space 1A does not flow out to the outside of the outer pipe 10. Similarly, even if water leaks between the second inner pipe 22 and the second inner sleeve 26, the outflowing fluid collects in the space 1B between the second connecting plate 6 and the third connecting plate 7. In this case, since the space between the second outer pipe 12 and the third outer pipe 13 and the second outer sleeve 17 is sealed by the seal rubber ring 16, the space between the second connecting plate 6 and the third connecting plate 7 is reached. The fluid that has flowed out into the space 1B does not flow out to the outside of the outer pipe 10.

Further, the external fluid does not enter the inner pipe 20 through the outer pipe 10.

As described above, according to the present embodiment, even if water leaks between the inner pipe 20, for example, the first inner pipe 21 and the first inner sleeve 25, the fluid leaked from the inner pipe 20 flows from the outer pipe 10. It does not leak to the outside.

In the above embodiment, an example in which the first connecting plate 5 is used as the first connecting body, the second connecting plate 6 is used as the second connecting body, and the third connecting plate 7 is used as the third connecting body is shown. However, not limited to this, as the first connecting body, the second connecting body, and the third connecting body, a plurality of rod-shaped first connecting bodies extending radially from the center to the peripheral edge, and radiation from the center to the peripheral edge. A plurality of rod-shaped second connecting bodies extending in a shape and a plurality of rod-shaped third connecting bodies extending radially from the center to the peripheral edge may be used.

1 Double pipe joint structure 5 First connecting plate (first connecting body)
6 Second connecting plate (second connecting body)
7 Third connecting plate (third connecting body)
10 Outer pipe 11 1st outer pipe 12 2nd outer pipe 13 3rd outer pipe 15 1st outer sleeve 16 Seal rubber ring 17 2nd outer sleeve 18 Seal rubber ring housing 20 Inner pipe 21 1st inner pipe 22 2nd inner pipe 23 3rd inner tube 25 1st inner sleeve 26 2nd inner sleeve 28 Seal rubber ring 31 Seal rubber ring housing 45A 1st hinge structure 45, 46 1st hinge part 47A 2nd hinge structure 47, 48 2nd hinge part

Claims (5)

The first outer tube, the second outer tube, the third outer tube, the first outer sleeve connecting the first outer tube and the second outer tube, the second outer tube and the third outer tube. With an outer pipe having a second outer sleeve connecting the
The first inner tube, the second inner tube, the third inner tube, the first inner sleeve connecting the first inner tube and the second inner tube, the second inner tube and the third inner tube. With an inner pipe having a second inner sleeve to connect with
The inner pipe is arranged in the outer pipe and
The first outer tube and the first inner tube are connected, the second outer tube and the second inner tube are connected, and the third outer tube and the third inner tube are connected.
The first outer tube and the second outer tube each have a first hinge portion connected to each other to form a first hinge structure, and the second outer tube and the third outer tube are connected to each other. A double pipe joint structure having each of the second hinge portions constituting the second hinge structure. The pair of first hinge portions of the first hinge structure can rotate with each other and can move in the axial direction.
The double pipe joint structure according to claim 1, wherein the pair of second hinge portions of the second hinge structure are rotatable with each other and movable in the axial direction. The first outer tube and the second outer tube are fitted to the inner surface of the first outer sleeve, and the second outer tube and the third outer tube are fitted to the inner surface of the second outer sleeve. Item 1. The double pipe joint structure according to Item 1 or 2. Claim that the first inner tube and the second inner tube are fitted to the inner surface of the first inner sleeve, and the second inner tube and the third inner tube are fitted to the inner surface of the second inner sleeve. The double pipe joint structure according to any one of 1 to 3. The first outer tube and the first inner tube are connected via a first connecting body, the second outer tube and the second inner tube are connected via a second connecting body, and the third outer tube and the third outer tube are connected. The double pipe joint structure according to any one of claims 1 to 4, wherein the third inner pipe is connected via a third connecting body.