JP2562295Y2 - Pipe joint structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joining structure , and more particularly to a pipe joining structure in which two pipe ends are joined by welding .

[0002]

With reference to the Prior Art FIG. 4, for example, as the bat fusion, two pipes 1 and 2 of the tube ends were heat-melted, respectively, in the case of fusion bonding against them,
The beat 4 was formed protruding from the inner surface of the joint 3.

[0003]

Conventionally, a beat 4 is formed so as to protrude from the inner surface of the joining portion 3, and there has been a problem that the pipe diameter is reduced by the beat 4. SUMMARY OF THE INVENTION Therefore, a main object of the present invention is to provide a joint structure of pipes which can join two pipe ends by abutting and joining them without reducing the pipe diameter.

[0004]

SUMMARY OF THE INVENTION This invention is based on the first and second aspects.
Pipe that joins the pipe ends of the second pipe
The joint structure of each of the first and second pipes
A substantially cylindrical body having an outer diameter substantially equal to the inner diameter of the body;
A metal short pipe having a projection protruding from the outer surface of
When the first pipe is covered from one end of the short metal pipe
In both cases, the second pipe is covered from the other end, and the first and
2 The melted ends of the pipes meet on the projection
It is a pipe joining structure that is welded and welded .

[0005]

The inner surface of the joint between the first pipe and the second pipe is made of metal.
As defined by the short pipe, projecting from the inner surface of the joint
No beat is formed. Also, the protrusion of the metal short pipe
However, since it cuts into the resin at the joint, a short metal tube
Does not move in the tube axis direction.

[0006]

[Effect of the invention] According to the invention , the pipe diameter at the joint is
Can be prevented from being reduced. In addition, the short metal pipe is bent
It is possible to prevent the pipe from moving to the bend and closing the pipeline.

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the accompanying drawings.

[0008]

EXAMPLES Referring to Figure 1, joining of pipes in this embodiment
The structure 10 is made of a synthetic resin such as polyethylene, for example.
Of two pipes 12a and 12b made of
Metal on the inner surface of the joint.
A tube 14 is included. Short metal pipe 1 4 comprises a substantially cylindrical body 1 6 made of a metal such as stainless steel or copper. The outer diameter of the body 1 6 is substantially equal to the two pipes 1 2 a and 1 2 b of the inner diameter to be joined, also in a substantially central portion outer surface of the body 1 6, and slightly enlarged over the entire periphery collision The part 18 is formed. Then, the outer surface of the metal short tube 1 4 pipe 1 2 a and 1 2 b is covered state.

The pipes 12a and 12b are connected to a short metal pipe 14
When covered state to the outer surface of the first, for example by using a butt-fusion heater 20 as shown in FIG. 2, heating and melting the pipe end of the pipe 1 2 a and 1 2 b. Then, as shown in FIG. 3, the pipe 1 2 a and 1 2b from one end and the other end of the metal short tube 1 4 covered state, molten tube ends of both etc.
The cows are butted on the projections 18 and fusion bonded . At this time, since the projections 1 8 functions as a stopper of the pipe 1 2 a and 1 2 b, protrusion 18 will be necessarily positioned intermediate pipe 1 2 a and 1 2 b, heated and melted has been is the thing becomes bite into the joint inner surface of the pipe 1 2 a and 1 2 b (Figure 1).

[0010] Incidentally, the metal short tube 1 4 heated by a burner or the like, there melted by heating the tubes end by covered state of the pipe 1 2 a and 1 2 b, and fused against both It is also possible. According to this embodiment, since the joint inner surface of the pipe 1 2 a and 1 2 b can be defined by a metal short tube 1 4, it is possible to prevent the beat protrudes joint inner surface as in the prior art is formed.

Further, projections 1 8 pipe 1 2 a and 1 2
In eating write Takeno the junction the inner surface of the b, the metal short tube 1 4 after bonding
However, there is no problem that the pipe moves to another and blocks the pipe at a bent portion of the pipe. In the above embodiment,
Although projections 1 8 is formed with a slightly enlarged over the outer surface entire circumference of the body 1 6, the projections 1 8, for example, may be formed only on a part of the outer surface circumferential direction of the body 1 6, Further, it may be externally attached.

[Brief description of the drawings]

FIG. 1 is an illustrative view showing one embodiment of the present invention;

FIG. 2 is an illustrative view showing a state where a pipe end of a pipe is heated and melted;

FIG. 3 is an illustrative view showing a state where pipes are joined;

FIG. 4 is an illustrative view showing a conventional technique;

[Description of Reference Numerals] 10 ... joint structure 1 2 a of the pipe, 1 2 b ... pipe 1 4 ... metal short tube 1 6 ... body 1 8 ... projection

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-51-38364 (JP, A) JP-A-55-142617 (JP, A) JP-A-1-304930 (JP, A) JP-A-4- 503640 (JP, A) JP-A-63-158226 (JP, A) JP-A-59-41516 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. The pipe ends of a first and a second pipe are pushed together.
A joint structure of pipes joined together, which is substantially equal to the inner diameter of each of the first and second pipes.
A substantially cylindrical main body having an outside diameter, and protruding from the outer surface of the main body.
A short pipe provided with a projection provided as the first pipe, and the first pipe is covered from one end of the short metal pipe.
And the second pipe is covered from the other end.
The molten pipe ends of the first and second pipes are connected to each other by the protrusion.
The joint structure of pipes that are butted and welded together
Build .