JPH10281355A - Pipe joint and pipe connecting method by using the pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve cooling efficiency a cooling pipe of a pipe panel type in arranging it and simplify the required work. SOLUTION: An external diameter and thickness are equal to a pipe 2 connected, an opening edge side end face of a bottomed cylinder of equal length is put in order, the pipe is arranged in parallel in a lengthwise direction, to be made in adhesion, to be broken from this close adhesion position along a peripheral surface symmetrically in a vertical direction over a prescribed section, a pipe joint 1 of shape integrally formed by connecting the fellow opposed edges of this broken part, by using a material approximate to a material of the pipe 2, is manufactured by casting. The pipe 2 of equal external diameter and thickness is arranged in parallel, a peripheral surface is closely attached by putting an end face (opening edge) 2a in order, this adhesion part is connected by welding, relating to this pipe 2, as two in a set, in the opening edge 2a of the end face thereof, a guitar-shaped opening edge 1a of the pipe joint 1 is made adhesion, butt welding is applied to the adhesion part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint and a pipe connecting method using the same.

[0002]

2. Description of the Related Art There are two types of water-cooled cooling pipes, such as an electric furnace, a heating furnace, and a boiler, which are disposed on a furnace wall, such as a jacket panel type and a pipe panel type.

In the case of the jacket panel type, a maze type partition plate is disposed inside, and the cross section of the flow path is rectangular and the bent portion is at a right angle. If the resistance is large and the flow rate is to be increased in order to increase the cooling efficiency, the water pressure must be increased compared to the case of a circular type, in which case the cooling pipe is corroded by rust etc. and the wall is weakened Cannot withstand water pressure,
A hole may be formed in the wall and water leakage may occur. In addition, in the bent portion at a right angle, water stagnates at the corner and scale and scale are accumulated, so that there is a drawback that the cooling efficiency is poor and the life of the panel is short.

On the other hand, since the pipe panel type cooling pipe has a circular cross section, the flowing water resistance is smaller than that of the jacket panel type, and the water pressure needs to be increased as much as the jacket panel type even when the flow velocity is increased. The risk of water leakage is small. Further, since there is no right-angled bent portion, water does not stagnate and scale and scale are not accumulated, cooling efficiency is improved, and panel life is greatly improved.

Further, when the pipe panel type water-cooled tube is used for a furnace lid, the total weight of the furnace lid is reduced, and the failure of the apparatus is reduced.

[0006] As described above, the pipe panel type water cooling tube has the above advantages as compared with the jacket panel type.

[0007]

By the way, the pipe panel type water cooling pipe as described above takes a form in which countless pipes are arranged in parallel on the wall of the electric furnace, heating furnace, boiler or the like. Adjacent parts are connected at their end faces by a butt welding type 180 ° elbow 20 as shown in FIG. In the figure, 2 is a pipe, and 21 is a deposited metal.

The direction of the water flow is reversed by the elbow 20, and the water moves in the parallel direction of the pipes 2 while sequentially moving to the adjacent pipe 2, and multiplies the distance in the length direction of the pipe 2 by the parallel direction. Cool the combined area. Such a conventional pipe 2 arrangement has the following problems.

That is, when the elbow 20 is welded to the end of the adjacent pipe 2, welding is performed over the entire periphery of the close contact edge of the two pipes. Since a gap 22 is formed between the gaps, a welding iron must be inserted into the gap 22 to perform welding.
It is very inconvenient.

After the piping, since the pipe 2 is not disposed on the surface to be cooled corresponding to the gap 22, the portion is not cooled, and the cooling efficiency of the entire piping system is very poor.
There is also a problem.

As for the latter, conventionally, a round rod of another material (not shown), which is not shown, is closely inserted into the gap 22 and welded, and a portion corresponding to the gap 22 is to be cooled through the round bar. However, in this method, the cooling effect is not so large.
There is a large difference in thermal stress generated between the pipe 2 and the round bar, and the pipe 2 may even be damaged based on the difference. In addition, the material increases due to the round bar, and the weight of the entire piping system also increases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pipe-panel type cooling pipe as described above, in which the cooling efficiency can be improved, and the work for that can be easily performed.

[0013]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, two pipes having the same outer diameter are arranged in parallel, the end faces are aligned, and the peripheral surfaces are brought into close contact with each other. A pipe joint that connects both holes of the pipes connected by the pipe and connects the fluid in the pipe so that the fluid flows from one pipe to the other pipe. In parallel to the direction, the opening side end faces are aligned, the peripheral surface is brought into close contact, the shape is formed by breaking over a predetermined range along the peripheral surface from the contact position, and continuing the opposing fracture edges. That is to say, (Claim 1).

[0014] With this configuration, the opening edge (connection portion with the pipe end face) of the pipe joint conforms to the shape of the end face of the pipe in the close contact state, so that the two pipes are connected by this pipe joint. Then, the pipes can be arranged in close contact.

According to a second aspect of the present invention, two pipes having the same outer diameter are arranged in parallel, the end faces are aligned, the peripheral surfaces are brought into close contact, and the adhered portions are connected by welding. The opening edge of the pipe joint according to the first aspect is brought into close contact with the opening end face of the pipe, and the adhered portion is welded to connect the two pipes (claim 2).

According to this connection method, since there is no gap between the adjacent pipes, the welding iron is inserted into the gap as in the connection between the elbow and the pipe when there is a gap between the pipes as in the conventional example. Is inserted, and it is not necessary to perform welding over the entire periphery of the contact portion, so that workability is remarkably improved.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a pipe joint 1 of this embodiment and a part of two closely-connected pipes connected by the pipe joint 1.

The pipe 2 is a pipe 2 having the same outer diameter and wall thickness, the end faces thereof being aligned, the peripheral surfaces being closely contacted, and the adhered portions being welded and connected. Although only four pipes 2 are shown in the figure, a required number of pipes 2 are arranged.

On the other hand, the pipe joint 1 is arranged such that a bottomed cylinder having the same outer diameter and wall thickness as the pipe 2 and having the same length is arranged in parallel with the opening edge side or the bottom side, and closely adhered to each other. It breaks symmetrically in the vertical direction along the circumferential surface from the contact position over a predetermined section, and forms an integrated shape by connecting opposing edges of the broken portion. Therefore, the opening edge 1a has a gourd shape as shown in FIG. 1 and FIG. 2, and the end surfaces thereof are aligned and the opening surfaces 2a and 2a of the two pipes 2 whose peripheral surfaces are closely connected are connected. So that they match. The pipe joint 1 is manufactured by casting using a material close to the material of the pipe 2. The pipe joint 1 having the above-described shape is used as follows.

First, on the pipe 2 side to be connected, as shown in FIG. 1, pipes having the same outer diameter and wall thickness are arranged in parallel, the end faces (opening edges) 2a are aligned, and the peripheral faces are brought into close contact with each other. Butt welding is applied to the close contact part to connect. The butt welding on the peripheral surface side does not need to be performed over the entire length of the pipe 2, but only needs to be performed for a required distance from the end face as long as the required connection strength can be satisfied. End face 2a
Welding is also performed on the chamfer at the adjacent position on the side to ensure that the gap is filled. Reference numerals 21 and 23 are welding metals.

For the pipes 2 connected on their peripheral surfaces,
As shown in FIG. 2 and FIG. 3, the gourd-shaped opening edge 1a of the pipe joint 1 is brought into close contact with the opening edge 2a of the end face as a pair, and butt welding is performed on the contact portion.

According to the connection of the pipes 2 using the pipe joint 1 having such a shape, the pipes 2 can be arranged in close contact with each other. Inserting a welding iron into the pipe, and eliminating the need for cumbersome work as in the case where welding had to be performed over the entire periphery of the close contact between the elbow and the pipe, and because there is no need to arrange a round bar in the gap, Work efficiency is significantly improved. The material cost for the round bar is also reduced, and above all, the cooling pipe is disposed in the gap instead of the conventional round bar, so that the cooling efficiency is remarkably improved.

Further, since this pipe joint is manufactured by casting as described above and is not manufactured by bending a pipe as in a conventional elbow, an outer peripheral portion where a large water pressure is applied as in the case of an elbow Does not become thinner, but rather, the thickness of that portion becomes larger than the other portions, so that the strength becomes stronger.

Further, when the pipe is provided on the lid for cooling the lid of an electric furnace or the like, the number of pipes for providing the same cooling effect is smaller than in the conventional case, so that the weight of the entire lid is reduced. In addition, it can contribute to the suppression of fatigue and the reduction of breakage of the structural material supporting the lid.

In the above description, a case where the end faces 2a of all the pipes 2 are arranged as an example of the arrangement of the pipes 2 has been described.
As shown in FIG. 4, as long as the two are paired,
Even if the pair of the two is stepped in the longitudinal direction, the pipe joint 1 of this embodiment is applied to the end surface 2a of each pair.
Can be connected, so that the present invention can be applied to such an arrangement of pipes.

FIG. 5 shows a case where the pipe joint 1 of this embodiment is applied to a cooling piping system for a lid of an electric furnace. In the figure, 3 is an electric furnace lid, 2 is a pipe, and 1 is a pipe joint.

Of course, not only an electric furnace but also a heating furnace, a boiler and the like having a partition for blocking a high-temperature atmosphere can be used, and the present invention can also be applied to connection of a cooling pipe provided in the furnace or the boiler.

[0028]

As described above, according to the present invention, the cooling pipes can be arranged in close contact with each other, so that the cooling efficiency can be improved and the work can be easily performed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment.

FIGS. 2A and 2B are views showing a use state of the embodiment in which a plane is shown and a front is shown in FIG.

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

FIG. 4 is a perspective view showing another embodiment.

FIG. 5 is a plan view showing an example of use of the embodiment;

FIG. 6 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe joint 1a Opening edge of pipe joint 2 Pipe 2a Opening edge (end face) of pipe 3 Electric furnace lid 20 Elbows 21, 23 Weld metal 22 Gap

Claims (2)

[Claims] 1. Two pipes having the same outer diameter are arranged in parallel, the end faces are aligned, the peripheral surfaces are brought into close contact, and the contact portions are connected by welding, but the two holes are connected. A pipe joint connected so as to flow from the other end, the pipe and the outer diameter are equal, two bottomed cylinders having the same length are arranged in parallel in the length direction, and the peripheral surfaces are aligned by aligning the opening side end surfaces. A pipe joint characterized in that it has a shape in which it is brought into close contact with each other, broken along a predetermined range from the contact position along the peripheral surface, and the opposing broken edges are connected to each other. 2. The two pipes having the same outer diameter are arranged in parallel, the end faces are aligned, the peripheral faces are brought into close contact, and the contact portions are connected by welding, and the two end faces of the two pipes are connected. A connection method for connecting two pipes by bringing an opening edge of the pipe joint into close contact with each other and welding the contact portion.