JPH0658479A - Double-pipe joint of branch part - Google Patents

Abstract

PURPOSE:To facilitate a job for welding of both vertical and horizontal pipes at the inside by constituting it after separating the outside horizontal pipe right and left at a branch part, in the captioned joint for noxious gas or the like for semiconductor manufacturing. CONSTITUTION:An end of a branch part of a horizontal pipe 3 at the outside is halved right and left by a vertically straight line cut surface 5 or a bonding surface of two horizontal pipes 3 themselves and a tilting, rectilinear cut surface 6 or a bonding surface with an outside vertical pipe 4. With this constitution, an inner part vertical pipe 2 and a horizontal pipe 1 are weldable before they are inserted through the outside horizontal pipe 3. After welding, the outside horizontal pipe 3 is attached and welded by the outside vertical pipe 4 and both these cut surfaces 6, 5. With this constitution, both welding and finishing operations become facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a toxic material for semiconductor manufacturing,
The present invention relates to a double pipe joint used at a branch portion of a pipe for supplying explosive gas or the like.

[0002]

2. Description of the Related Art In a conventional double pipe joint at a branch portion, an outer lateral pipe is composed of a single lateral pipe and is not separated.

[0003]

Conventionally, in manufacturing a double pipe joint at a branch portion, as shown in FIG. 3, first, an outer lateral pipe C is inserted into an inner lateral pipe A, and then an outer lateral pipe is inserted. The inner vertical pipe B is welded to the inner horizontal pipe A through the connecting hole E of the outer vertical pipe D provided in C, and then the outer vertical pipe D is attached to the inner vertical pipe B.
And the outer vertical pipe D was welded to the outer horizontal pipe C.

However, in the conventional method, when the inner vertical pipe B is welded to the inner horizontal pipe A, the connecting hole E of the outer horizontal pipe C is formed.
Since more welding work must be carried out, the inner lateral pipe A must be lifted up at the time of welding, and the rising part of the branch portion of the inner lateral pipe A must be brought as close to the connecting hole E as possible, which is very troublesome. If the rising portion is made higher, the outer lateral pipe C does not support and enter. Further, during welding, if the slug enters the bent portion inside the rising portion, it is difficult to cut or polish, and it is also difficult to finish the outer surface of the welded portion. Further, in forming the connecting hole E also in the outer lateral pipe C, it was very difficult to cut the connecting hole E into a curved surface.

In order to solve the above point, the present invention makes it possible to easily weld an inner vertical pipe to an inner horizontal pipe, and
It is an object of the present invention to provide a double pipe joint having a branch portion, which facilitates cutting of a connecting portion of an outer pipe.

[0006]

In order to solve the above-mentioned problems, the double pipe joint of the present invention is a double pipe joint in which an outer pipe is inserted into an inner pipe in which a vertical pipe is vertically connected to a side face of a horizontal pipe. In the above, the outer lateral pipe is divided into right and left at a branch portion.

[0007]

The operation of the double pipe joint of the present invention will be described. Since the outer lateral pipe is separated into the left and right, the inner vertical pipe is placed inside before the outer lateral pipe is inserted into the inner lateral pipe. Can be welded to a horizontal pipe. After welding, the left and right outer horizontal pipes are inserted into the inner horizontal pipes, and the outer vertical pipes are inserted into the inner vertical pipes toward the bifurcation, and the outer vertical pipes and the left and right outer horizontal pipes are inserted. It can be easily manufactured by welding.

Therefore, when the inner horizontal pipe and the vertical pipe are welded, the obstructing outer pipe is not inserted, so that the welding operation can be facilitated and the outer surface of the welded portion can be easily finished. Further, since the cut end of the branch portion of the outer pipe can be cut linearly, the manufacturing becomes easy.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the double pipe joint of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a state in which outer pipes of the double pipe joint of the present invention are separated, and FIG. FIG. 3 is a front view showing an embodiment of the double pipe joint of the present invention, and FIG. 3 is a front view showing an embodiment of a conventional double pipe joint. In the figure, reference numeral 1 denotes an inner horizontal pipe, and an inner vertical pipe 2 is welded to the side surface of the central portion of the horizontal pipe 1. 3 is an outer lateral tube that is separated left and right,
Reference numeral 4 is an outer vertical tube.

The end portion of the branch portion of the outer horizontal pipe 3 has a vertical and linear cut surface 5 which is a bonding surface between the horizontal tubes 3 and an inclined straight line which is a bonding surface with the outer vertical tube 4. Cut surface 6
Are formed.

[0011]

According to the present invention, when manufacturing a double pipe joint at a branch portion, the inner vertical pipe and the horizontal pipe can be welded before inserting the outer horizontal pipe, so that the outer horizontal pipe can be welded as in the conventional case. Since it is not necessary to weld from the connecting hole formed in the pipe, the welding work and the finishing process are greatly facilitated. Further, since the cut portion of the branch portion of the outer pipe can be cut linearly, the outer pipe can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a front view showing a state in which an outer pipe of a double pipe joint of the present invention is separated.

FIG. 2 is a front view showing an embodiment of the double pipe joint of the present invention.

FIG. 3 is a front view showing an embodiment of a conventional double pipe joint.

[Explanation of symbols]

 1 Inside horizontal pipe 2 Inside vertical pipe 3 Outside horizontal pipe 4 Outside vertical pipe

Claims (1)

[Claims] 1. In a double pipe joint in which an outer pipe is inserted into an inner pipe in which a vertical pipe is vertically connected to a side face of the horizontal pipe, the outer horizontal pipe is divided into right and left at a branch portion. A double pipe joint at a branch, which is characterized in that