JPH1151279A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect pipes to each other without any gap by forming a stopper so that its tip protruded inward is provided with side faces which are tilted so as to be gradually thickened from the base part connected to the inner circumferential face in a pipe joint in which the stopper protruded inward is arranged in the approximately central part of the inner circumferential face. SOLUTION: In a synthetic resin pipe, the tip is curved inward at 15 degrees substantially, and as a result, the end face is also tilted at 15 degrees. In a pipe joint used for connection of this kind of synthetic resin pipes, pipe receiving ports 2 are arranged in both side end parts, while a stopper 3 protruded inward is arranged in the approximately central part on the inner circumferential face. The stopper 3 is formed so that its tip part protruded inward is provided with side faces 31 which are tilted at 15 degrees approximately so as to be gradually thickened from the base part connected to the inner circumferential face. In this way, the tip end face of the synthetic resin pipe and the side face 31 can be brought into tight contact with each other when the synthetic resin pipe is inserted into each of the both pipe receiving ports 2 until its tip collides against the side face 31, and subsequently, the inner circumferential face and the side face 31 are melted and fused together by applying electric current to a heater 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pipe joint.
Particularly, the present invention relates to a pipe joint suitable for connecting a synthetic resin pipe.

[0002]

2. Description of the Related Art Conventionally, synthetic resin pipes have been connected using pipe joints. For example, as described in Japanese Patent Application Laid-Open No. 5-87286, a pipe is inserted into pipe receptacles provided on both sides of a pipe joint, and the pipe joint and the end face of the pipe are bonded with an adhesive, or heat is applied to the pipe joint. The inner peripheral surface of the synthetic resin pipe joint is melted by the body, and the pipe joint and the pipe are fused.

[0003] The pipe joint is generally provided with a stopper protruding inward substantially at the center of the inner peripheral surface, so that the ends of the pipes inserted from both ends do not exceed the stoppers. Can be connected almost at the center of the pipe joint. The synthetic resin tube used at this time is formed by extruding a molten synthetic resin into a tubular shape from an annular mold of an extruder, passing through a cooling jacket and cooling from the outside as described in JP-B-35-8739. , And the cooled tubular body was cut into a predetermined length to produce the tubular body.

[0004]

However, as shown in FIG. 4, the synthetic resin tube 100 manufactured by the extruder as described above is used.
Is cooled from the outer peripheral surface, as a result, the cooling of the synthetic resin inside the pipe is delayed, so that the synthetic resin inside contracts when cooling, and tends to bend inward due to the contraction during cooling. Distortion occurs. Then, the deformation due to the distortion does not appear at the center, but curves inward at the tip 101.

As described above, when the distal end 101 is bent inward, when the distal end 101 is inserted into the pipe joint 200, the end face of the distal end 101 of the pipe and the stopper 201, as shown in FIG. A gap 301 is formed between the gaps and a gap 302 is formed between the gap 301 and the inner peripheral surface of the pipe joint 200. Then, dust or the like accumulates in the gaps 301 and 302, and microorganisms propagate in the gaps, and the flow of the fluid in the pipe deteriorates. Therefore, the pipes need to be cleaned frequently, which is extremely inconvenient.

[0006] In particular, in the case of a pipeline used for sewerage,
Such problems often occur because there are many suspended matters floating in the sewer and microorganisms are easy to propagate. Therefore,
An object of the present invention is to provide a pipe joint that can be connected without a gap even if the tip of the pipe is curved inward.

[0007]

DISCLOSURE OF THE INVENTION The present invention has been made to achieve the above object, and has a pipe receiving port provided at both ends and a stopper protruding inward substantially at the center of the inner peripheral surface. In the provided pipe joint, the stopper has a side surface whose tip protruding inward is gradually wider and wider than a root connected to the inner peripheral surface.

(Operation) In the present invention, the stopper has a side surface which is gradually widened from the root where the tip protruding inward is connected to the inner peripheral surface. Is inserted and the tip collides with the stopper, the end face of the tip curved inside the synthetic resin pipe coincides with the inclined side face of the stopper, and the tip face of this synthetic resin pipe and the side face of the stopper are aligned. In close contact. In this manner, the synthetic resin pipe is connected by the pipe joint with the tip face and the side face of the stopper being in close contact with each other, so that there is no gap.

[0009]

1 to 3 show an embodiment of the present invention. FIG. 1 is an explanatory view showing a partially cut-away state of a pipe joint, and FIG. 2 is a state of a front end of a synthetic resin pipe. An explanatory diagram showing
FIG. 3 is an explanatory diagram showing a use state of the pipe joint.

1 to 3, reference numeral 5 denotes a synthetic resin tube made of a polyethylene tube. The distal end 51 of the synthetic resin tube 5 is bent inward by 15 ° due to distortion during manufacturing, and as a result, the end face is also inclined by 15 °.

Reference numeral 1 denotes a pipe joint made of polyethylene for electrofusion. The pipe joint 1 is provided with a pipe receiving port 2 at both ends and a stopper 3 protruding inward at substantially the center of the inner peripheral surface. ing. The stopper 3 has a side surface 31 whose tip protruding inward is gradually widened at an angle of 15 ° from a root connected to the inner peripheral surface. A heater 4 made of a nichrome wire is embedded near the inner peripheral surface of the pipe receiving port 2 and near the side surface of the stopper 3, and the heater 4 made of the nichrome wire is connected to a terminal 6 provided on the outer peripheral surface. Have been.

Next, a method and an operation for connecting the synthetic resin pipe 5 using the pipe joint 1 will be described. A synthetic resin pipe 5 is inserted into the pipe receptacles 2 on both sides of the
1 until it collides with the side surface 31 of the stopper 3.
Then, the end face of the tip 51 curved inside the synthetic resin pipe 5 coincides with the inclined side face 31 of the stopper 3, and the end face of the tip 51 of the synthetic resin pipe 5 matches the side face 3 of the stopper.
1 adheres closely.

Next, an electric current is passed from the terminal 6 to the heater 4 to melt the inner peripheral surface and the side surface of the stopper 3. Then, the outer peripheral surface of the distal end portion of the synthetic resin pipe 5 and the end surface of the distal end 51 are fused to the inner peripheral surface of the pipe joint 1 and the side surface 31 of the stopper 3. As described above, the front end 51 and the side surface 31 of the stopper 3 are in close contact with each other, and the synthetic resin pipe is connected by the pipe joint.

In this way, the connection can be made without any gaps, so that no garbage accumulates at this joint portion and no microorganisms propagate. Therefore, even if the fluid is used for a long time, the fluid does not easily flow through the synthetic resin pipe 5, and therefore, it is not necessary to clean the fluid for a long time, which is convenient.

[0015]

According to the present invention, since the stopper has a side face whose tip protruding inward is gradually widened from the root connected to the inner peripheral surface, the synthetic resin pipe is provided in the pipe receiving openings on both sides. When it is inserted and its tip collides with the stopper, the tip face of the synthetic resin tube and the side face of the stopper come into close contact. In this manner, the synthetic resin pipe is connected by the pipe joint with the tip face and the side face of the stopper being in close contact with each other, so that there is no gap. As described above, since the connection is made without any gap, there is no accumulation of refuse in this joint portion or propagation of microorganisms. Therefore, even if it is used for a long time, the fluid does not easily flow through the synthetic resin pipe,
This eliminates the need for long-term cleaning, which is convenient.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, and FIG. 1 is an explanatory view showing a partially cut-off state of a pipe joint.

FIG. 2 is an explanatory diagram showing a state of a distal end of a synthetic resin pipe.

FIG. 3 is an explanatory diagram showing a use state of a pipe joint.

FIG. 4 is an explanatory view showing a use state of a conventional pipe joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe joint 2 Pipe socket 3 Stopper 31 Side surface 4 Heater 5 pipe (synthetic resin pipe)

Claims (1)

[Claims] 1. A pipe joint in which a pipe receiving port is provided at both end portions and a stopper protruding inward is provided substantially at the center of the inner peripheral surface. A pipe joint characterized in that it has a side surface which is gradually wider than a root connected to the surface.