JPH089505Y2 - Flange mounting structure for pipe - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flange mounting structure for a pipe.

[0002]

2. Description of the Related Art Conventionally, as a structure for attaching a flange to the end of a metal pipe, a method of welding and fixing the flange to the outer periphery of the end of the pipe has been generally used.

However, in the case where the flange is directly welded to the outer circumference of the pipe, when the flange portion is fixed to one end of the pipe and a bending moment is applied to the other end of the pipe,
The rigidity of the pipe portion and the flange portion in the vicinity of welding is low, and a crack is generated in the portion.

Therefore, as a means for increasing the rigidity, the plate material itself is made thicker, or as shown in FIGS. 6 and 7, the support stay (auxiliary plate) is located near the flange 2 on the outer periphery of the pipe 1. 3 is assembled by welding 4. The support stay 3 is divided into two in the circumferential direction and is connected to each other by welding 4a.

[0005]

However, in the case where the thickness of the pipe is thick or the support stay is used as described above, there is a problem that the mass is increased and the product price is increased.

Therefore, the present invention aims to solve this problem.

[0007]

In order to solve the above-mentioned problems, the present invention bends and inverts the end of the pipe (5) on the flange assembly side to the outer peripheral surface side of the pipe (5) to form the inner pipe portion. and (5a) and the double pipe structure composed of an outer tube portion (5b), fitted flange (6) to the outer tube portion (5b), the inner pipe section and the outer tube portion and the flange (6) (5b) Melt together with (5a)
The outer pipe part (5b) has a rear end that is fixed to the inner pipe.
It is welded and fixed to the part.

[0008]

[0009]

[0010]

EXAMPLES present considered Anmi施例shown in FIG. 1 will be described.
5 is a metal pipe, the end of the assembly side of the flange,
The flange assembly part is formed in a double pipe structure composed of an integrated inner pipe part 5a and outer pipe part 5b by bending and reversing to the outer peripheral surface side of the pipe 5.

The outer tube portion 5b is superposed on the inner tube portion 5a in an intimate contact with each other, and the length of reversal thereof is determined as desired. Reference numeral 6 denotes a metal flange, and a fitting hole 6a having the same outer diameter as that of the outer tube portion 5b is formed in the center portion thereof.
a is fitted to the outer periphery of the outer pipe portion 5b and is welded 7 to form the outer pipe portion 5b.
It is stuck to.

According to this embodiment, the section modulus of the pipe in the flange assembly portion can be increased as compared with that of the single pipe, and the rigidity of the welded portion of the flange can be increased. Also, since only the flange assembly part can be formed into a thick plate by using a pipe of normal plate thickness, the entire pipe can be compared to a pipe that uses a thick plate to make the flange assembly part a thick plate. It is possible to reduce weight and cost.

Further, since the support stay, which is a separate part, unlike the conventional case is not used, part management can be facilitated and welding points can be reduced. In addition, since the flange assembly side is a thin double tube, secondary processing such as expanding (sweeping), swaging (spouting), flanging, etc. is possible compared to the conventional support stay. Can be easily performed, and can be easily adapted to the shape of the mating pipe to be connected.

The outer tube portion 5b in the embodiment shown in FIG.
The same action and effect can be exhibited by bending and reversing the inner pipe portion 5a toward the inner peripheral surface side .

[0015]

The inner and outer pipes are integrated by seaming the inner and outer pipes.
Welding, then welding the flange 7a, and
The rear end of b is also fixed to the inner pipe portion 5a by welding 7b.

According to this embodiment, the front bent portion 5 of the pipe is
When g is stress fractured, the welds 7a, 7b can maintain the integrity of both tubes 5a, 5b .

[0018]

[0019]

[0020]

According to the present invention , the section modulus of the pipe in the flange assembly portion can be increased as compared with a single pipe, and the rigidity of the pipe in the vicinity of the welded portion of the flange can be increased.

Further, since only the flange assembly portion can be formed into a thick plate by using a pipe having a normal plate thickness, as compared with the case where a thick plate pipe is used to form the flange assembly portion into a thick plate. The overall weight and cost of the pipe can be reduced.

Further, since the support stay, which is a separate component, unlike the conventional one, is not used, component management can be facilitated and welding points can be reduced. Furthermore, since the pipe on the flange welded part is a thin double pipe, compared to the conventional support stay, two types of pipes such as expanding, swaging, and flanging are used.
Subsequent processing can be performed easily and can be easily adjusted to the shape of the mating pipe to be connected.

[0023] When the curved portion Hasho before pipes were stress rupture at the welded portion can be maintained the integrity of the inner and outer pipe section.

[0024]

[Brief description of drawings]

Side view cutaway principal part showing a real施例disclosed exemplary invention.

FIG. 2 is a sectional view of a main part showing a conventional structure .

3 is a cross-sectional view taken along the line AA in FIG .

[Explanation of symbols]

5 Pipe 5a Inner pipe part 5b Outer pipe part 5g Inversion side end part 6 Flange 7, 7a, 7b Welded part

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location F16L 23/028

Claims (1)

[Scope of utility model registration request] 1. A double pipe structure comprising an inner pipe portion (5a) and an outer pipe portion (5b) by bending and inverting the end of the pipe (5) on the flange assembly side to the outer peripheral surface side of the pipe (5). soluble and was fitted with flanges (6) to the outer tube portion (5b), outer tubular part and inner tubular part (5b) and (5a) integral with the flange (6)
The outer pipe part (5b) has a rear end that is fixed to the inner pipe.
Fraction for a pipe characterized by being welded and fixed to the pipe
Mounting structure