JP2006009914A - Insert pipe joint structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insert pipe joint structure, which is applicable to connection of pipes for high-temperature fluid, and which secures seal performance at a connecting part without increasing size tolerance precision in the diametric direction in both pipes. <P>SOLUTION: In this insert pipe joint structure, a first pipe 1 is inserted into a second pipe 2, the first pipe 1 and the second pipe 2 are fixed by a prescribed fixing means, and a circular seal member 3 is provided between an outer circumferential surface of the first pipe 1 and an inner circumferential surface of the second pipe 2. The circular seal member 3 is made of a metal thin plate member having elasticity to have a roughly V-shaped cross section. As the circular seal member 3 is opened toward the insert direction of the first pipe 1 to the second pipe 2, it is set in such a way that an inner circumferential edge part and an outer circumferential edge part of the circular seal member 3 are applied to the outer circumferential surface of the first pipe 1 and the inner circumferential surface of the second pipe 2 respectively under prescribed force. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an insertion pipe joint structure, and more particularly to an improved technique for an insertion pipe joint structure that is optimal for connection of pipes constituting an exhaust system for a vehicle.

  Conventionally, in a state where the first pipe is inserted into the second pipe, the first pipe and the second pipe are fixed by a predetermined fixing means, and the outer peripheral surface of the inserted first pipe and the second pipe are fixed. An insertion pipe joint structure having a structure in which the connecting portion is sealed by interposing a gasket (annular seal member) between the inner peripheral surface of the first and second embodiments (see, for example, Patent Documents 1 and 2) and The annular seal member is made of an elastic material such as synthetic rubber or soft plastic, and an annular packing having an annular groove formed on one end face is used. Conventional example 2 (see, for example, Patent Document 3). )It has been known.

Japanese Utility Model Publication No. 9-79454 (page (3) of the specification, FIG. 1) Japanese Utility Model Publication No. 9-112696 (Specification (page 4), FIG. 2) Japanese Utility Model Laid-Open No. 5-64592 (Specification (page 6), FIG. 1)

However, since the gasket is used as the annular seal member in the plug-in pipe joint structure of the conventional example 1, there are problems as described below.
That is, in order to seal between the outer peripheral surface of the first pipe and the inner peripheral surface of the second pipe with a gasket, it is necessary to increase the dimensional accuracy of both pipes in the seal portion. Since it is difficult to obtain a dimensional tolerance accuracy in the radial direction, it is difficult to ensure sealing performance.
Moreover, in order to improve the sealing performance in the seal portion, it is possible to tighten the outer periphery of the seal portion with a clamp.

  Further, in the plug-in pipe joint structure of the conventional example 2, since the material of the annular seal member cannot withstand high temperature, the fluid flowing through the pipe is hot like an exhaust system in which high-temperature exhaust gas flows. Is not applicable.

  The problem to be solved by the present invention is applicable to the connection of pipes through which a high-temperature fluid flows, and it is possible to ensure the sealing performance of the connection parts without increasing the dimensional tolerance accuracy in the radial direction of both pipes. The object is to provide a possible bayonet joint structure.

  In order to solve the above-described problem, the insertion pipe joint structure according to claim 1 is configured such that the first pipe and the second pipe are fixed by a predetermined fixing means in a state where the first pipe is inserted into the second pipe. In the insertion pipe joint structure in which the annular seal member is interposed between the outer peripheral surface of the first pipe and the inner peripheral surface of the second pipe, the annular seal member is made of metal having elasticity. An inner peripheral edge of the annular seal member, which is formed of a thin plate material and has a substantially V-shaped cross section, and the annular seal member is opened in the insertion direction of the first pipe with respect to the second pipe. And means for interposing the outer peripheral side edge portion in contact with the outer peripheral surface of the first pipe and the inner peripheral surface of the second pipe with a predetermined force, respectively. did.

  The insertion pipe joint structure according to claim 2 is the insertion pipe joint structure according to claim 1, wherein the insertion pipe joint structure is opened in a V shape at an outer peripheral side edge portion of the annular seal member formed in a substantially V shape in cross section. A guide piece that is inclined in a direction in which the tip edge thereof is radially reduced toward the direction is extended.

  The plug-in pipe joint structure according to claim 3 is the plug-in pipe joint structure according to claim 1, wherein a folded piece is extended to the outer peripheral side edge of the annular seal member formed in a substantially V-shaped cross section. The tip edge portion of the folded piece is inclined in the direction of expanding in the radial direction.

  The insertion pipe joint structure according to claim 4, wherein the first pipe and the second pipe are fixed by a predetermined fixing means in a state where the first pipe is inserted into the second pipe, and the first pipe is fixed. In an insertion pipe joint structure in which an annular seal member is interposed between an outer peripheral surface of a pipe and an inner peripheral surface of the second pipe, the annular seal member is a thin metal plate material having elasticity and has a cross section of approximately Z It was characterized by being formed in a letter shape.

  The insertion pipe joint structure according to claim 5 is the insertion pipe joint structure according to any one of claims 1 to 4, wherein the metal thin plate constituting the annular seal member is made of stainless steel. It was set as means.

In the plug-in pipe joint structure according to claim 1, as described above, the annular seal member is formed of a metal thin plate material having elasticity and has a substantially V-shaped cross section, and the annular seal member is the second pipe relative to the second pipe. The inner peripheral side edge and the outer peripheral side edge of the annular seal member are opened with respect to the outer peripheral surface of the first pipe and the inner peripheral surface of the second pipe in a state where the pipe is opened in the insertion direction of the first pipe. By adopting a configuration in which the pipes are in contact with each other with a predetermined force, it is possible to ensure the sealing performance of the connecting portion without increasing the dimensional tolerance accuracy in the radial direction of both pipes. An effect is obtained.
Further, since the annular seal member is made of a thin metal plate material having elasticity, the annular seal member can be applied to connection of a pipe through which a high-temperature fluid such as exhaust gas flows.

  In the insertion pipe joint structure according to claim 2, as described above, the tip edge portion of the annular seal member formed in a substantially V-shaped cross section toward the direction opened in the V shape at the outer peripheral side edge portion. By adopting a configuration in which the guide piece that is inclined in the direction in which the diameter is reduced in the radial direction is extended, the annular seal member can be easily pressed into the second pipe along the inclination of the guide piece. It becomes like this.

  In the insertion pipe joint structure according to claim 3, as described above, the folded piece is extended to the outer peripheral side edge portion of the annular seal member formed in a substantially V-shaped cross section, and the tip edge portion of the folded piece is By adopting a configuration that is inclined in the direction of expanding the diameter in the radial direction, the annular seal member can be easily pressed into the second pipe along the inclination of the folded piece.

  In the insertion pipe joint structure according to claim 4, as described above, the annular seal member is formed of a metal thin plate material having elasticity and having a substantially Z-shaped cross section. Since it can be attached to the second pipe without worrying about the direction of the annular seal member, it can be attached to the second pipe regardless of the direction of installation. It becomes possible to improve the sex.

  In the insertion pipe joint structure according to claim 5, as described above, the metal thin plate constituting the annular seal member is made of stainless steel, so that the outer circumference of the first pipe is made by the stretchability of stainless steel. The surface and the inner peripheral surface of the second pipe can be brought into close contact with each other, thereby improving the sealing performance.

  Embodiments of the present invention will be described below with reference to the drawings.

The insertion pipe joint structure of the first embodiment corresponds to the invention described in claims 1 and 5.
First, the insertion pipe joint structure of the first embodiment will be described with reference to the drawings.

FIG. 1 is a front view of a connection state showing the plug-in pipe joint structure of the first embodiment, and FIG. 2 is an enlarged half sectional view taken along line II-II in FIG.
The insertion pipe joint structure of the first embodiment includes a first pipe 1, a second pipe 2, an annular seal member 3, and a C-type clamp (fixing means) 4 as main components.

  More specifically, the first pipe 1 is formed with a chevron-shaped bead 11 bulging radially outward in the vicinity of the end of the first pipe 1, while the end of the second pipe 2 is the end of the first pipe 1. The pipe 1 is formed to have a diameter larger than the outer diameter of the pipe portion 1a at the tip of the bead 11, and the annular seal member 3 is interposed between the large diameter portion 2a and the pipe portion 1a. The seal is surely performed.

  In addition, a flare 21 that expands radially outward and contacts the end-side tapered surface 11a of the mountain-shaped bead 11 in the first pipe 1 is formed at the end of the large-diameter portion 2a in the second pipe 2. Is formed.

The C-shaped clamp 4 has a structure in which a main body portion 41 is formed in a substantially circular shape with a part of the cutout, and fastening flanges 42 and 43 that extend substantially parallel to the outside are provided at both ends of the cutout. ing.
The main body 41 is formed in a mountain-shaped cross section that bulges outward in the radial direction except for the flat plate portion 41a at the center of the circumference. That is, the flat plate portion 41a is provided to allow the C-shaped clamp 4 to expand the notch portion by a predetermined angle with the flat plate portion 41 as the center. In the figure, reference numeral 44 denotes a fastening bolt.

  The annular seal member 3 is formed of an elastic metal thin plate material such as SUS302 so as to have a substantially V-shaped cross section, and the annular seal member 3 is inserted in the insertion direction of the first pipe 1 with respect to the second pipe 2. The inner peripheral side edge and the outer peripheral side edge of the annular seal member 3 are opened with a predetermined force against the outer peripheral surface of the first pipe 1 and the inner peripheral surface of the second pipe 2 in the state of being opened to the front. It is inserted in a contacted state.

Next, operations and effects of the first embodiment will be described.
In the first embodiment, as described above, the annular seal member 3 is made of a thin metal plate material having elasticity, so that it can be applied to connection of a pipe through which a high-temperature fluid such as exhaust gas flows. is there.

  The annular seal member 3 is made of a thin metal plate having elasticity and has a substantially V-shaped cross section. This is the direction in which the first pipe 1 is inserted into the second pipe 2, that is, the fluid flows to the outside. The inner peripheral side edge and the outer peripheral side edge of the annular seal member 3 are connected to the outer peripheral surface of the first pipe 1 and the second pipe 2 while being opened toward the upstream side with respect to the leaking direction. By connecting the inner peripheral surfaces of the pipes 1 and 2 with a predetermined force, it is possible to seal the connecting portions without increasing the dimensional tolerance accuracy in the radial direction of the pipes 1 and 2. The effect that it becomes possible to ensure property is acquired.

  Next, another embodiment will be described. In the description of the other embodiments, the same components as those of the first embodiment are not shown, or the same reference numerals are given and the description thereof is omitted, and only the differences are described.

This plug-in pipe joint structure according to the first embodiment corresponds to the invention described in claims 2 and 5.
The insertion pipe joint structure of the second embodiment shows a modification of the annular seal member in the first embodiment.

  That is, as shown in the enlarged half sectional view of the main part of FIG. 3, the insertion pipe joint structure of the second embodiment is V-shaped on the outer peripheral side edge of the annular seal member 3 formed in a substantially V-shaped cross section. The difference from the first embodiment is that the guide piece 31 is inclined so as to extend in the direction in which the distal end edge is radially reduced toward the direction opened in the shape. .

  Accordingly, in the second embodiment, the same effect as in the first embodiment can be obtained, and the annular seal member 3 can be easily press-fitted into the second pipe 2 along the inclination of the guide piece 31. An additional effect is obtained.

This plug-in pipe joint structure of the third embodiment corresponds to the inventions described in claims 3 and 5.
The plug-in pipe joint structure of the third embodiment shows a modification of the annular seal member in the first embodiment.

  That is, the insertion pipe joint structure of Example 3 is folded back at the outer peripheral side edge portion of the annular seal member 3 having a substantially V-shaped cross section as shown in the enlarged half sectional view of the main part in FIG. 32 is different from the first and second embodiments in that 32 is extended and the tip edge portion of the folded piece 32 is inclined in the radial direction.

  Therefore, in the third embodiment, the same effect as in the first embodiment can be obtained, and the annular seal member 3 can be easily press-fitted into the second pipe 2 along the inclination of the folded piece 32. An additional effect is obtained.

This insertion pipe joint structure of the fourth embodiment corresponds to the inventions described in claims 4 and 5.
The insertion pipe joint structure of the fourth embodiment shows a modification of the annular seal member in the first embodiment.

  That is, in the insertion pipe joint structure of the fourth embodiment, as shown in the enlarged half sectional view of the main part in FIG. 5, the annular seal member 3 is formed of a thin metal plate material having a substantially Z-shaped cross section. The point made into the structure currently performed is different from the said Examples 1-3.

  Therefore, in the fourth embodiment, the same effect as in the first embodiment can be obtained, and the annular seal member 3 is opened in a substantially V shape regardless of which direction the annular seal member 3 is mounted. The second pipe 2 can be mounted without worrying about the direction of the annular seal member 3, so that an additional effect that the assembling workability can be improved is obtained.

  Further, by extending the inclined guide pieces 33 and 34 at the outer peripheral side edge and the inner peripheral side edge of the annular seal member having a substantially Z-shaped cross section, the second pipe 2 can be provided. The additional effect that the press-fitting of the annular seal member 3 and the insertion of the first pipe 1 into the annular seal member 3 can be performed easily is obtained.

Although the present embodiment has been described above, the present invention is not limited to the above-described embodiment, and design changes and the like within a scope not departing from the gist of the present invention are included in the present invention.
For example, in the embodiment, a mountain-shaped beat 11 is formed in the first pipe 1 as a fixing means, while the second pipe 2 side is expanded radially outward to form a mountain shape in the first pipe 1. An example is shown in which the flare 21 that abuts the end-side tapered surface 11a of the bead 11 is formed, and this portion is fixed by being clamped in the radial direction by the C-shaped clamp 4, but the configuration of the fixing means is as follows. Is optional.

  Moreover, in the Example, although the example which uses SUS302 as a metal thin plate material which has the elasticity which comprises the annular seal member 3 was shown, another metal can be used if it is a metal which has heat resistance.

It is a front view which shows the insertion pipe joint structure of Example 1. FIG. 2 is an enlarged half sectional view taken along line II-II in FIG. 1. It is a principal part expanded half sectional view which shows the insertion pipe joint structure of Example 2. FIG. It is a principal part expanded half sectional view which shows the insertion pipe joint structure of Example 3. FIG. It is a principal part expanded half sectional view which shows the insertion pipe joint structure of Example 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st pipe 1a Pipe part of front-end | tip 11 Bead 11a End side taper surface 2 Second pipe 2a Large part 21 Flare 3 Annular seal member 31 Guide piece 32 Folding piece 33 Inclined guide piece 34 Inclined guide Piece 4 C type clamp (fixing means)
41 Main Body 41a Flat Plate 42 Fastening Flange 43 Fastening Flange 44 Fastening Bolt

Claims (5)

In a state where the first pipe is inserted into the second pipe, the first pipe and the second pipe are fixed by a predetermined fixing means, and the outer peripheral surface of the first pipe and the second pipe are In the insertion pipe joint structure of the structure in which the annular seal member is interposed between the inner peripheral surface,
The annular seal member is formed of a thin metal plate material having elasticity and has a substantially V-shaped cross section,
With the annular seal member being opened in the insertion direction of the first pipe with respect to the second pipe, the inner peripheral edge and the outer peripheral edge of the annular seal member are connected to the first pipe. An insertion pipe joint structure characterized in that the insertion pipe joint structure is interposed with a predetermined force against the outer peripheral surface of the second pipe and the inner peripheral surface of the second pipe.   2. The insertion pipe joint structure according to claim 1, wherein a tip edge of the annular seal member having a substantially V-shaped cross section is radially oriented toward a V-shaped open end of the annular seal member. An insertion pipe joint structure characterized in that a guide piece inclined in the direction of reducing the diameter is extended.   The insertion pipe joint structure according to claim 1, wherein a folded piece is extended to an outer peripheral side edge portion of the annular seal member formed in a substantially V-shaped cross section, and a distal end edge portion of the folded piece is in a radial direction. An insertion pipe joint structure characterized in that it is inclined in the direction of expanding the diameter. In a state where the first pipe is inserted into the second pipe, the first pipe and the second pipe are fixed by a predetermined fixing means, and the outer peripheral surface of the first pipe and the second pipe are In the insertion pipe joint structure of the structure in which the annular seal member is interposed between the inner peripheral surface,
An insertion pipe joint structure characterized in that the annular seal member is formed of a thin metal plate material having elasticity and has a substantially Z-shaped cross section.   The insertion pipe joint structure according to any one of claims 1 to 4, wherein the metal thin plate constituting the annular seal member is made of stainless steel.

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