JP2002323186A - Expansion joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an expansion joint, the connecting part of bellows of which will not be damaged, even with repeated expansion and contraction in a short period. SOLUTION: The expansion joint comprises bellows 43 for absorbing the expansion and contraction of ducts 65 and 67, a pair of flanges 45 and 47 mounted on ends of the bellows 43, and a pair of support members 49 and 51 which are disposed between the flanges 45 and 47 and the bellows 43, so as to be in contact with the bellows 43 respectively and which have a shape corresponding to the bellows-shape. The pair of support members 49 and 51 are secured on the flanges 45 and 47 respectively, so as to be separable from the bellows 43.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expansion joint.

[0002]

2. Description of the Related Art FIG. 2 shows a cross section of an upper portion of a conventional metal expansion joint. The metal expansion joint 1 includes a bellows 3 and a pair of left and right flanges 5 and 7. The bellows 3 is a member having a cylindrical bellows structure made of metal,
It can be expanded and contracted in the axial direction. The first flange 5 is connected to one end of the bellows 3 via a fillet weld 9. Similarly, a second flange 7 is connected to the other end of the bellows 3 via a fillet weld 11. These first flange 5 and second flange 7 respectively
The third flange 17 and the fourth flange 19 connected to the corresponding steel first duct 13 and second duct 15, respectively, are connected.

[0003] The metal expansion joint 1 constructed as described above.
In a structure in which a pair of ducts 13 and 15 are connected to each other, when heat is applied to the ducts 13 and 15, the ducts may be extended by the heat. Here, when the pair of ducts 13 and 15 are directly connected, the duct is bent or distorted as much as the duct is extended, so that the duct has irregularities. However, since the pair of ducts 13 and 15 are connected by the metal expansion joint 1, the shape of the bellows 3 changes in the above-described structure, so that the duct 1
3 and 15 can be absorbed.

[0004]

However, in the above-mentioned conventional metal expansion joint, each time the bellows 3 expands or contracts, a fillet welded portion which is a connection between the bellows 3 and the pair of left and right flanges 5 and 7 is provided. A large force acts on 9 and 11,
While repeating expansion and contraction, the fillet welds 9 and 11 may be damaged in a short period of time.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of such problems of the prior art, and provides an expansion joint in which a connection portion of a bellows is not damaged in a short period of time even if expansion and contraction are repeated. With the goal.

[0006]

To achieve the above object, an expansion joint according to the present invention comprises a bellows means for absorbing expansion and contraction of a member to be connected, a flange means provided at an end of the bellows means, Disposed between the flange means and the bellows means in contact with the bellows means,
Support means having a shape corresponding to the shape of the bellows means. Preferably, the support means is fixed to the flange means and is separable from the bellows means.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of the upper part of the metal expansion joint according to the present embodiment. The metal expansion joint 41 includes a bellows 43 that absorbs expansion and contraction of a duct that is a connected member, a pair of left and right flanges 45 and 47 as flange means, and a pair of left and right support members 49 and 51 as support means. ing.

The bellows 43 is a cylindrical member made of a thin metal plate, and has a bellows structure in which peaks and valleys are repeated. A first flange 45 is disposed on the left end side of the bellows 43 in FIG. The first flange 45 is a tubular member that covers the left end of the bellows 43 from the outside, and has a flange-like portion that protrudes outward in the radial direction. The first flange 45 and the bellows 43 are connected to each other via a fillet weld 53 at the left end of the bellows 43. A second flange 47 is disposed symmetrically to the first flange 45 on the right end side of the bellows 43 in FIG. Like the first flange 45, the second flange 47 is a cylindrical member that covers the right end of the bellows 43 from the outside, and has a flange-like portion that protrudes radially outward. The second flange 47 and the bellows 43 are connected to each other via a fillet weld 55 at the right end of the bellows 43.

An annular first support member 49 is arranged between the first flange 45 and the bellows 43. More specifically, the first support member 49 includes the first flange 4
The bellows 43 is provided in the valley 57 on the left end side of the bellows 43 and is connected to the right end of the first flange 45 via an annular fillet weld 59. Further, the first support member 49 has a shape along the curved shape of the valley portion 57, and has a fan-shaped cross section obtained by dividing a circle into four at an opening angle of 90 degrees in the present embodiment. The first support member 49 is not adhered to the bellows 43, and the valley 5
7 and can be separated from each other. Note that the opening angle of the support members 49 and 51 is not limited to 90 degrees, and other angles can be appropriately selected according to conditions such as the shape of the bellows and the force received.

On the other hand, between the second flange 47 and the bellows 43, a second support member 51 is disposed symmetrically with respect to the first support member 49 having an annular shape. The second support member 51 also has a bellows 43 close to the second flange 47.
And is connected to the left end of the second flange 47 via an annular fillet welded portion 63. Further, the second support member 51 has a shape along the curved shape of the valley portion 61, and in the present embodiment, has a fan-shaped cross section obtained by dividing a circle into four and having an opening angle of 90 degrees. The second support member 51 is not adhered to the bellows 43, and can be brought into surface contact with and separated from the valley 61 of the bellows 43 according to the situation.

The third flange 77 is connected to the ends of the first and second steel ducts 65 and 67 through annular fillet welds 69, 71 and 73, 75, respectively.
And the fourth flange 79 are connected.

Next, the operation of the metal expansion joint 41 configured as described above will be described. Bellows 43, a pair of flanges 45, 47 and a pair of support members 49, 5
The first flange 45 and the third flange 77 of the metal expansion joint 41 are welded and connected to each other by a suitable fastening means 81 at both flanges. Further, the second flange 47 and the fourth flange 79 are
The two flanges are connected by a suitable fastening means 83. Thus, the first duct 65, which is the connected member,
And the second duct 67 are interconnected. Also, duct 6
When heat is applied to 5, 67, the duct may be thermally elongated due to thermal stress. However, in this case, bellows 4
The bellows 43 can expand and contract so as to absorb the thermal expansion of the ducts 65 and 67 by changing the inclination of the portion connecting the peaks and valleys of No. 3. Also, conventionally,
Although the force associated with the expansion and contraction of the bellows is received only at the fillet weld between the bellows and the flange, in the present embodiment, the force associated with the deformation of the bellows 43 is applied to the pair of support members 49,
51 can also receive. Therefore, in the present embodiment, the force that was conventionally received only at the fillet weld between the bellows and the flange can be dispersed and received, and the fillet weld between the bellows and the flange can be received for a short time. It is possible to reliably prevent breakage between them. In addition, while being able to prevent damage to the fillet weld in this way,
Since the pair of support members 49 and 51 are not adhered to the bellows 43 and are supported only by the ends of the pair of flanges 45 and 47, the support members 49 and 51 are provided with bellows 43 so as to appropriately absorb expansion and contraction. The desired deformation is not hindered.

[0013]

As described above, according to the expansion joint according to the first aspect of the present invention, the force generated when the bellows expands and contracts can be dispersed and received, and the connecting portion between the bellows and the flange can be received. Can be prevented from being damaged in a short period of time. According to the expansion joint according to claim 2, claim 1 is provided.
In addition to the above-described effects of the expansion joint, the support member can be prevented from obstructing the intended deformation of the bellows.

[Brief description of the drawings]

FIG. 1 is a sectional view of an upper portion of an expansion joint according to an embodiment of the present invention.

FIG. 2 is a sectional view of an upper portion of a conventional expansion joint.

[Explanation of symbols]

41 ... expansion joint, 43 ... bellows, 45, 47 ... flange, 49, 51 ... support member, 65, 67 ... duct.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigeru Okawa 2-12-10 Shibadaimon, Minato-ku, Tokyo Inside A & A Materials Co., Ltd. (72) Inventor Seiji Hashimoto 37F Kamigamo Domoncho, Kita-ku, Kyoto-shi, Kyoto Terms (reference) 3H104 JA07 JB02 JC10 JD09 LB13 LB38 LC05 LG03 LG30

Claims (2)

[Claims] 1. A bellows means for absorbing expansion and contraction of a member to be connected, a flange means provided at an end of the bellows means, and a contact between the flange means and the bellows means, the bellows means being arranged. And a support means having a shape corresponding to the shape of the bellows means. 2. The expansion joint according to claim 1, wherein the support means is fixed to the flange means and is separable from the bellows means.