JP2868750B1 - Connection structure of branch pipe - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To provide a connection structure of a branch pipe for connecting a small-diameter branch pipe to a large-diameter main pipe with a pipe joint interposed therebetween. An object of the present invention is to improve the appearance and provide a highly reliable structure. SOLUTION: The present invention provides a hole 7 provided on a peripheral surface of a main pipe 1.
Is raised to form a protruding tube 6, the protruding tube 6 is covered with one end of the extension tube 4 of the pipe joint 3, and the outer diameter of the protruding tube 6 is extended by extending the diameter of the protruding tube 6. 4 is connected in close contact with the inner peripheral surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a branch pipe connection structure in which a pipe joint is interposed between a large-diameter main pipe and a small-diameter branch pipe in order to connect the small-diameter branch pipe to the main pipe. The present invention relates to a connection structure between a pipe and a pipe joint, and a specific field of use is, for example, a structure for connecting a branch pipe for a branch branched to a home to a water pipe for a main stream.

[0002]

2. Description of the Related Art A conventional technique for connecting a small-diameter branch pipe to a large-diameter main pipe is to form a hole in the main pipe and weld an end of a pipe joint to the periphery of the hole. In general, a technique is known in which a pipe joint protrudes laterally from a main pipe and a branch pipe is connected to a tip of the pipe joint.

[0003]

However, in the conventional method, welding must be performed all over the outer periphery of the end of the pipe joint so that liquid or gas does not leak from the connecting portion between the main pipe and the pipe joint. In addition to taking a long time, the work required considerable skill. Also, even if welding is performed all over, the welding condition is not always uniform over the entire circumference, and it requires a further level of skill to perform the welding, which is highly reliable. It was difficult to make a connection structure. In addition, the welding process has an unavoidable problem that the welded portion impairs aesthetics.

The present invention has been made in view of the above circumstances, and aims at simplifying the operation of connecting a pipe joint to a main pipe, improving the aesthetic appearance, and achieving high reliability. An object of the present invention is to provide a connection structure for a branch pipe.

[0005]

As a means for solving the above-mentioned problems, a connecting structure for a branch pipe according to the present invention is characterized in that a hole is formed in the peripheral surface of a large-diameter main pipe, and a peripheral portion of the hole is raised using a tool. By raising, a projecting tube is formed that projects laterally from the main tube.The projecting tube is inserted into one end of the extension tube of the fitting, and the diameter of the projecting tube is expanded by using a tool to expand the diameter of the projecting tube. The extension pipe is connected in close contact with the inner peripheral surface of the extension pipe, and a branch pipe may be directly connected to the extension pipe. The connection may be made with another component, for example, an elbow or the like interposed. A pipe joint is a general term for short parts that connect a plurality of pipes. An extension tube is a short and straight tube.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The connection structure of a branch pipe according to the present invention is shown in FIG.
As shown in FIG. 1, a main pipe 1 having a large diameter, a branch pipe 2 having a smaller diameter than the main pipe 1, and a pipe joint 3 interposed between the main pipe 1 and the branch pipe 2.
And The pipe joint 3 is composed of an extension pipe 4 which is much shorter and straighter than the main pipe 1 and the branch pipe 2 and an elbow 5 which is also short and bent. One end of the extension pipe 4 is connected to the main pipe 1. Is connected to the protruding pipe 6 protruding laterally from the peripheral surface of the elbow 5, the other end of the extension pipe 4 is connected to one end of the elbow 5, and the other end of the elbow 5 is connected to the branch pipe 2. is there. The projecting tube 6 has a far smaller diameter than the main tube 1.

The procedure for assembling the above-described branch pipe connection structure will be described below. First, as shown in FIG. 2, a circular hole 7 is bored in a part of the peripheral surface of the main pipe 1 so as to communicate with the inside. Next, as shown in FIG. 3, the tip of the expander tool 8 is inserted into the hole 7, the outer diameter of the tip of the tool 8 is increased, and the outer periphery of the tip is pressed against the inner surface of the hole 7. Further, by pulling the tool 8 upward, the hole 7 is removed.
Is raised while stretching the peripheral portion of the tube to form a projecting tube 6 as shown in FIG. When the rising height of the protruding tube 6 is insufficient, the forming operation of the protruding tube 6 is repeated. Thereafter, as shown in FIG. 5, the extension pipe 4 is put on the protruding pipe 6 so as to surround a part slightly away from the protruding pipe 6 inside the lower part of the extension pipe 4. Is inserted into the protruding tube 6 from above the extension tube 4 and the diameter of the protruding tube 6 is expanded by using expander processing, so that the outer peripheral surface of the protruding tube 6 is brought into close contact with the inner peripheral surface of the extension tube 4. . Finally, as shown in FIG. 1, a female screw 10 provided on the inner periphery of the end of the elbow 5 is screwed into a male screw 9 provided on the upper outer peripheral surface of the extension tube 4 to connect the extension tube 4 and the elbow 5. ,
Further, the branch pipe 2 is connected to the other end of the elbow 5 in the same manner.

In order to assemble the above, the extension tube 4 needs to be long enough to use the tool 8 and have a linear shape, and the main tube 1 is flexible enough to be deformable by the tool 8. It is necessary to use a suitable metal material.

The present invention is not limited to the above embodiment. For example, the pipe joint 3 is composed of an extension pipe 4 and a Y-shaped pipe branched into two branches, and is provided at both ends of the Y-shaped pipe. The branch pipes 2 may be connected respectively.

[0010]

The connection structure of a branch pipe according to the present invention is such that the outer peripheral surface of the protruding pipe is extended only by pushing up the diameter of the protruding pipe formed by raising the peripheral portion of the hole of the main pipe. Since the structure is such that the connection can be made in close contact with the inner peripheral surface, the connection operation can be performed easily, and thereby the whole operation of connecting the branch pipe to the main pipe with the extension pipe interposed can be performed easily and quickly. In addition, since the degree of close contact between the protruding pipe and the pipe joint is uniform at any point, the main pipe and the pipe joint are connected in an ideal state, and as a result, a highly reliable connection structure is obtained. Further, since welding is not used unlike the conventional case, the beauty of the connection between the extension pipe and the main pipe is improved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing a typical example of a branch pipe connection structure of the present invention.

FIG. 2 is a perspective view showing a state in which a hole is formed in the main pipe.

FIG. 3 is an enlarged front view of an essential part showing an operation of erecting a peripheral portion of a hole.

FIG. 4 is an enlarged front view of a main part showing a state where a peripheral portion of the hole is raised and a protruding tube is provided.

FIG. 5 is an enlarged front view of a main part showing an operation of connecting an extension pipe of a pipe joint to a protruding pipe.

FIG. 6 is an enlarged front view of a main part showing a state where an extension pipe is connected to a protruding pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main pipe 2 Branch pipe 3 Fitting 4 Extension pipe 6 Projection pipe 7 Extraction hole

Claims (1)

(57) [Claims] 1. A branch pipe connection structure for connecting a small-diameter branch pipe (2) to a large-diameter main pipe (1) with a pipe joint (3) interposed therebetween, wherein a peripheral surface of the main pipe (1) is provided. The protruding pipe (6) is formed by raising the periphery of the hole (7) provided in the pipe, and the protruding pipe (6) is covered with one end of the extension pipe (4) of the pipe joint (3). A) connecting the outer peripheral surface of the protruding tube (6) in close contact with the inner peripheral surface of the extension tube (4) by increasing the diameter of the branch pipe;