JPH0791245A - Pipe joint - Google Patents

Abstract

PURPOSE:To connect a nonmetal cylinder between two exhaust pipes in their axial direction thereof in a pipe joint in which the nonmetal cylinder is connected between ends of the two exhaust pipes, even though a bolt or a nut is not used as coupling means for connecting the nonmetal cylinder between the metal pipes. CONSTITUTION:An annular flange 2 is provided to one end 1A of one 1 of metal pipes 1, and an annular flange 4 is provided to one end 3A of the other one of the metal pipes. A nonmetal cylinder 5 is located between the flanges 2, 4 of both pipes. Annular gaskets 9, 10 are provided between the opposite end surfaces 5A, 5B of the nonmetal cylinder 5 and the annular flanges 2, 4 of both pipes 1, 3, respectively. Further, a plurality of connecting plates 11, 12 bridging between the annular flanges 2, 4 of both pipes 1, 3 are welded at their axial opposite edges 11B 11C, 12B, 12C to the annular flanges 2, 4 of both pipes 1, 3, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for connecting two exhaust pipes arranged in, for example, an exhaust system of an automobile, and more particularly to a pipe joint between pipe ends of the two exhaust pipes. The present invention relates to a pipe joint for assembling a non-metallic tubular body.

[0002]

2. Description of the Related Art In order to control the flow of exhaust gas and exhaust noise, the exhaust system of an automobile is equipped with, for example, an actual Kaihei 3-1101.
Devices such as the control valve shown in Japanese Patent No. 16 and the exhaust shutter shown in FIG. 5 are mounted. In order to smoothly rotate the valve of the exhaust shutter, a ceramic material having an excellent oxidizing effect due to the influence of the high temperature of the exhaust gas is used.

As shown in FIG. 5, an annular flange 102 is provided at a pipe end 101A of one exhaust pipe 101, and an annular flange 104 is provided at a pipe end 103A of the other exhaust pipe 103. Annular flanges 102,1
An exhaust shutter 105 made of a ceramic material is arranged between the parts 04.

4 threaded through the four holes in the annular flange 102
The bolts 106 of the book are passed through the exhaust shutter 105 to the annular flange 104 side, and the bolts 106 are tightened with nuts (not shown).
05 is mounted between the annular flanges 102 and 104.

[0005]

However, the exhaust shutter 105 made of a ceramic material is attached to the exhaust pipe 10 made of metal.
The metal exhaust pipes 101, 10 cannot be joined to the exhaust shutter 105 by welding when the metal exhaust pipes 101, 103 are assembled.
It is unavoidable to use bolts 106 and nuts as connecting means for mounting the exhaust shutter 105 between the three.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to use a bolt and a nut as a connecting means for mounting a non-metallic cylinder between metal tubes. It is an object of the present invention to provide a pipe joint in which a non-metallic cylinder can be mounted between the two pipes in the axial direction even if they are not used.

[0007]

SUMMARY OF THE INVENTION According to the present invention, an annular flange is provided at the tube end of one metal tube, and an annular flange is provided at the tube end of the other metal tube. A non-metallic tubular body is placed between the pipes, annular gaskets are provided between the end faces of the non-metallic tubular body and the annular flanges of each pipe, and a plurality of connecting plates are bridged over the annular flanges of both pipes. It is characterized in that both axial edges are welded to the annular flanges of both pipes.

[0008]

In the present invention, the two axial edges of the plurality of connecting plates are welded to the annular flanges of the two tubes, so that the two tubes are integrated via the plurality of connecting plates.

The non-metallic cylinder is sandwiched between both pipes and is mounted between a plurality of connecting plates bridged by the annular flanges of both pipes. Moreover, since the annular gaskets are provided between the annular flange and the non-metallic cylinder, gas leakage is prevented.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a pipe joint according to an embodiment of the present invention, which will be described by taking an exhaust pipe in an exhaust system of an automobile as an example of a metal pipe.

In the figure, reference numeral 1 is one exhaust pipe in an exhaust system of an automobile, and a pipe end 1A of the one exhaust pipe 1
In addition, the first annular flange 2 is joined by welding. The other exhaust pipe 3 is arranged coaxially with the one exhaust pipe 1 at a predetermined distance, and the second annular flange 4 is welded to the pipe end 3A of the other exhaust pipe 3.

Between the first and second annular flanges 2 and 4 of both the exhaust pipes 1 and 3, a non-metal cylinder body 5 made of a ceramic material and made of a valve body is arranged. Support holes 6 and 7 are provided in the upper and lower portions of the non-metallic tubular body 5, and between the support holes 6 and 7, the upper shaft member 8A and the lower shaft member formed on the upper and lower ends of the butterfly valve 8 and the lower shaft, respectively. The material 8B is supported, and the upper shaft material 8A and the lower shaft material 8B penetrate through the support holes 6 and 7.

The butterfly valve 8 is rotatable around the axes of the support holes 6 and 7. The material of the butterfly valve 8 is ceramics. A first annular gasket 9 is provided between both end surfaces 5A and 5B of the non-metallic tubular body 5 and the first and second annular flanges 2 and 4 of the exhaust pipes 1 and 3, respectively.
A second annular gasket 10 is provided. The first annular gasket 9 and the second annular gasket 10 are made of, for example, asbestos and wire mesh.

A state in which a non-metallic tubular body 5 and a first annular gasket 9 and a second annular gasket 10 located on both sides thereof are sandwiched between the first and second annular flanges 2 and 4 of both exhaust pipes 1 and 3. Thus, the pair of connecting plates 11 and 12 are bridged. Each of the connecting plates 11 and 12 is formed in a curved plate shape, and holes 11A and 12 are formed in the center thereof, and the upper shaft member 8A and the lower shaft member 5 of the non-metallic cylinder 5 are formed in these holes 11A and 12, respectively. 8B penetrates and is fitted.

Mats 13 and 14 made of ceramic fibers are sandwiched between the connecting plates 11 and 12 and the outer peripheral surface of the non-metallic tubular body 5, respectively. Mats 13 and 14
Is for preventing and protecting the non-metallic cylinder 5 and the connecting plates 11 and 12 from interfering with each other.

Axial edges 11B, 11C, 12B and 12C of the pair of connecting plates 11 and 12 are welded to the first and second annular flanges 2 and 4 of the exhaust pipes 1 and 3, respectively.

Then, by rotating the butterfly valve 8, the flow or cutoff of the exhaust gas flowing through the exhaust pipes 1 and 3 is controlled. Next, a method of manufacturing the pipe joint according to this embodiment will be described. First, the first annular gasket 9 and the second annular gasket 9 are formed on both sides of both end surfaces 5A and 5B of the non-metallic tubular body 5.
Annular gasket 10 and first and second annular flanges 2, 4
And press it with the surface pressure required for sealing.

The first annular gasket 9, the second annular gasket 10, and the first and second annular flanges 2, 4 are pressed against both sides of the both end surfaces 5A, 5B of the non-metallic cylinder 5 from above and below. The connecting plates 11 and 12 are fitted, and both edges 11B and 11C in the axial direction of the pair of connecting plates 11 and 12,
12B and 12C are welded onto the first and second annular flanges 2 and 4 of the exhaust pipes 1 and 3, respectively. Finally, the first and second annular flanges 2 and 4 are joined to the pipe ends 1A and 3A of the exhaust pipes 1 and 3 by welding.

During welding, the first and second annular flanges 2, 4
This prevents the non-metallic tubular body 5 from being displaced in the axial direction. By restraining both sides of the first and second annular flanges 2 and 4 with the connecting plates 11 and 12, the axes of the first annular flange 2 and the second annular flange 4 are aligned with each other, and vertical deviation is prevented. Further, since the upper shaft member 8A and the lower shaft member 8B are fitted in the support holes 6 and 7 formed in the connecting plates 11 and 12, when the connecting plates 11 and 12 are attached, the displacement in the circumferential direction is prevented. Has been done.

In the present embodiment, however, both axial edges 11B, 11C of the pair of connecting plates 11, 12 are
12B and 12C are respectively connected to the first and second exhaust pipes 1 and 3.
Since it is welded to the annular flanges 2, 4, both exhaust pipes 1,
3 is integrated via a pair of connecting plates 11 and 12. The non-metallic tubular body 5 is sandwiched between the exhaust pipes 1 and 3, and a pair of connecting plates 11 bridged to the first and second annular flanges 2 and 4 of the exhaust pipes 1 and 3, 12
Is installed between.

In addition, between the first and second annular flanges 2 and 4 and the non-metallic tube body 5, the first annular gasket 9 and the second annular gasket 2 are provided.
Because of the annular gasket 10, gas leakage is also prevented.

According to the above construction, the non-metal cylinder 5
In order to assemble the exhaust pipes 1 and 3 with the exhaust pipes 1 and 3, it is not possible to weld the exhaust pipes 1 and 3 to the non-metallic cylinder body 5, and therefore, bolts and nuts are used in the conventional example. In the present embodiment, the non-metallic tubular body 5 is sandwiched between the first and second annular flanges 2 and 4 of both exhaust pipes 1 and 3, and the first and second annular flanges 2 and 4 are connected to the connecting plates 11 and 1.
Since they are joined at 2, the non-metallic cylinder 5 and the exhaust pipes 1, 3
Exhaust pipes 1, 3 without the design requirement of welding
Can be joined by sandwiching the non-metallic cylindrical body 5 between them.

In short, the exhaust pipes 1 and 3 can be integrated without using bolts and nuts by utilizing the arrangement in which the non-metallic tubular body 5 is sandwiched between them. Eliminates the need for bolts and nuts to mount the metal cylinder. As a result, the number of parts can be reduced and the size can be reduced.

The pipe ends 1A and 3A of the two exhaust pipes 1 and 3
Before joining the first and second annular flanges 2 and 4 by welding, the first annular gasket 9, the second annular gasket 10 and the first and second annular gaskets 10 and 1 are provided on both sides of both end surfaces 5A and 5B of the non-metallic tubular body 5. Since the connecting plates 11 and 12 are welded while the second annular flanges 2 and 4 are pressurized, a uniform surface pressure of the first annular gasket 9 and the second annular gasket 10 is obtained, and the sealing performance is improved. Can be made.

Further, the non-metallic tubular body 5, the second annular gasket 10 and the first and second annular flanges 2 and 4 are unitized, and the first and second annular flanges 2 and 4 and the exhaust pipe 1,
Since 3 is welded, the exhaust pipes 1 and 3 can be reliably joined.

In this embodiment, the exhaust pipe in the exhaust system of an automobile is described as an example of the metal pipe, but the present invention is not limited to this. Further, in the present embodiment, the number of connecting plates is two, but it may be three or more.

Further, in the present embodiment, the valve body is described as an example of the non-metallic cylindrical body, but the present invention is not limited to this, and, for example, a pair of exhaust pipes. An example is a case where a heater that requires insulation is sandwiched between annular flanges provided at the ends.

In the present embodiment, the exhaust pipe 1,
Although the first annular flanges 2 and 4 are joined to the two pipe ends 1A and 2A by welding, the present invention is not limited to such forming means, and the exhaust pipes 1 and 2 are formed into a thin wall and press-folded, It is also possible to integrally form the annular flanges on the tube ends 1A and 2A of the thin exhaust pipes 1 and 2 by flare processing, curling processing, or the like.

[0029]

As described above, according to the present invention,
In order to assemble a non-metallic cylinder and a metal pipe, the non-metallic cylinder is sandwiched by the annular flanges of both pipes, and both annular flanges are joined by a plurality of connecting plates. Even if the metal pipes are not joined by welding, the metal pipes can be joined by sandwiching the non-metal cylinder between them.

In essence, the metal tubes are bolted by utilizing an array of non-metallic cylinders between them.
It can be integrated without using nuts, and it is not necessary to use bolts and nuts for mounting the non-metallic cylinder body as in the conventional example. Therefore, it is possible to overcome the joining condition that the metal pipe cannot be joined to the non-metallic cylinder by welding.

[Brief description of drawings]

FIG. 1 is a side view of a pipe joint according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line II of FIG.

FIG. 3 is a sectional view taken along line II-II of FIG.

FIG. 4 is a perspective view of the pipe joint.

FIG. 5 is a perspective view of a conventional pipe joint.

[Explanation of symbols]

 1 One Exhaust Pipe (Pipe) 1A Pipe End 2 First Annular Flange 3 Other Exhaust Pipe (Pipe) 3A Pipe End 4 Second Annular Flange 5 Non-Metallic Cylindrical Body 5A End Face 5B End Face 9 First Annular Gasket 10 Second Annular gasket 11 Connection plate 11B edge 11C edge 12 Connection plate 12B edge 12C edge

Claims (1)

[Claims] 1. A tube end (1A) of one metal tube (1)
, An annular flange (2) is provided, and an annular flange (4) is provided at the pipe end (3A) of the other metal pipe (3), and a non-metallic material is provided between the annular flanges (2, 4) of both pipes. The tubular body (5) is arranged, and an annular gasket (9) is provided between both end surfaces (5A, 5B) of the non-metallic tubular body (5) and the annular flanges (2, 4) of the pipes (1, 3). , 10), and the axial edges (11B, 11C, 12B, 12C) of the plurality of connecting plates (11, 12) arranged to bridge the annular flanges (2, 4) of both pipes (1, 3). ) Are welded to the annular flanges (2, 4) of both pipes (1, 3), respectively.