JPH1130377A - Soft synthetic resin pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out highly reliable connecting construction even under harsh environment by a mechanical connection method. SOLUTION: It is constituted of a joint main body 1, an outer ring 2 and a flange 3. An end of a pipe A is forcibly fitted outside of a connecting surface 4 of the joint main body 1, and additionally, the outer ring 2 is fitted outside thereof. A pipe end is clamped by the connecting surface 4 and the outer ring 2, and a pipe inwall bites in an irregularity of the connecting surface 4. The flange 3 is structured divided in two pieces and can be freely connected and disconnected to and from the joint main body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint used for a soft synthetic resin pipe, for example, a polyethylene pipe for water supply.

[0002]

2. Description of the Related Art Conventionally, when connecting a polyethylene pipe and a device such as a valve in the construction of a water supply pipe,
Since direct connection between the two is not possible, the connection is usually made using a short polyethylene pipe with a flange. This flanged polyethylene short pipe is one in which a metal flange is integrally fixed to one end of a short polyethylene pipe in advance by factory production. And this connection construction, first, the end of the polyethylene pipe that was piped and the end of the short side of the pipe with the flange on the polyethylene side are connected by an electrothermal fusion method, and then the flange and the like are used for valves and the like. Connect to the device.

[0003]

However, in the method using the short pipe with a flange, since the pipes are fused and connected,
When working in a bad environment such as during rainfall, poor construction is likely to occur. In particular, since water works are carried out in an excavated area, muddy water and the like are often applied to a connection point, which hinders fusion splicing, and there is a problem that connection failure is likely to occur and construction reliability is poor. The present inventor has already proposed a joint for solving this problem (Japanese Patent Application No. 9-105128). This joint adopts a mechanical connection method instead of the fusion splicing method.The pipe end of the polyethylene pipe is fitted and connected to the inner surface of the flanged fitting body, and the inner sleeve is further fitted inside the fitting. The sleeve is expanded in diameter using a tool, and the end of the tube is sandwiched between the joint body and the inner sleeve to be fixedly supported. That is, this joint is an inner fitting type mechanical joint type joint.

An object of the present invention is to provide a joint for a soft synthetic resin pipe having a high connection reliability by a mechanical connection system, which employs an external fitting type in place of the previously proposed internal fitting type. Another object of the present invention is to provide a joint for a soft synthetic resin pipe having a detachable flange. Still another object of the present invention is to provide a joint for a soft synthetic resin pipe having a high connection strength.

[0005]

The technical means of the joint for a soft synthetic resin pipe according to the present invention comprises a joint body, an outer ring, and a flange, and forcibly places a pipe end outside a joint surface of the joint body. By fitting and then forcibly fitting the outer ring to the outside, the pipe end is pinched and fixed between the coupling surface and the outer ring, and the flange is attached to the end of the joint body in a split structure. Is to be.

In addition, the coupling surface of the joint body is made uneven,
It is also possible for the inner wall of the tube to bite into this irregularity during connection.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the joint according to the present invention will be described with reference to the drawings. The joint of the present invention is made of metal such as stainless steel, and includes a joint main body 1, an outer ring 2, and a split flange 3. FIG. 1 shows a state in which the joint of the present invention is attached to a pipe end of a polyethylene pipe A for water supply.

The pipe connecting surface 4 of the joint body 1 is formed with irregularities and the like to increase the strength of the connection with the pipe A and prevent the pipe from coming off. After fitting the end of the tube A to the coupling surface 4, the outer ring 2 is further fitted to the outside thereof. Note that both of these fittings are press-fitted, and are performed using an appropriate tool. As a result, the tube A is strongly sandwiched between the coupling surface 4 and the outer ring 2 from both sides, and the inner surface of the tube A bites into the unevenness of the coupling surface 4. In addition, an inclined surface is formed at an end of the joint body 1 and an end of the outer ring 2 so that the fitting can be performed smoothly.

The flange 3 has a split structure as shown in FIG. 2 and is attached to the annular groove 5 at the end of the joint body 1. Since the flange 3 is divided into two parts, it can be freely attached and detached, and can be freely rotated with respect to the joint body 1 in the attached state. For this reason, when fitting the pipe or outer ring
The flange 3 can be left out of the way. Then, it is attached after the fitting is completed. Further, since the flange 3 is rotatable, it is easy to align bolt holes between the flanges, and it is possible to improve workability during piping work.

FIGS. 3 to 7 show an example of an operation for connecting a polyethylene pipe to a joint in the order of steps. FIG. 3 shows the separated state of each member before the connection. FIG. 4 shows the first stage of the joining operation, in which the outer ring 2 is fitted to the pipe A in advance,
The pipe end is brought into contact with the tip of the joint body 1 and the insertion tool 10
Is set. The insertion tool 10 draws two arms 11 by a screw method. A split ring 12 is temporarily fixed to the wall of the pipe A. The hook at the tip of the arm 11 is hooked on the split ring 12 and
Is rotated to pull the arm 11. As a result, the end of the pipe A is forcibly fitted to the outside of the coupling surface 4 of the joint body 1 as shown in FIG.

Next, once the insertion tool 10 is removed and the split ring 12 is removed, the outer ring 2 is moved to the vicinity of the joint as shown in FIG. Then, the insertion tool 10 is set again, and the claw of the arm 11 is hooked on the outer ring 2. Then, the arm 11 is pulled by rotating the screw rod 14, and the outer ring 2 is forcibly fitted to the outside of the tube A as shown in FIG. By fitting the outer ring 2,
The pipe end is strongly pressed against the joint surface 4 of the joint main body 1, and the inner wall of the pipe bites into the unevenness of the joint surface 4. Then, the insertion tool 10 is removed, and finally the split flange 3 is
Attach to

The present invention is not limited to the above embodiment, but can be freely modified and implemented within the scope of the claims. In particular, the shape of the joint body 1, the shape of the unevenness of the coupling surface 4, the shape of the flange 3, and the like are arbitrary.

[0013]

According to the joint of the present invention, since the pipe end of the soft synthetic resin pipe is sandwiched between the joint body and the outer ring and is firmly connected and fixed, the joint strength is high and the joint strength is high. The tube does not fall out even under strong tensile forces. Also, since the present invention uses a mechanical connection method,
The construction reliability is higher than the conventional fusion method, and construction failure does not occur even under adverse effects such as rainfall. Further, since the present invention has a two-piece structure with a detachable flange, it can be detached when work is obstructed, and can be rotated, so that the positioning of the bolt holes can be easily performed, which is convenient for construction. Is good. In addition, the present invention has a simple joining operation, excellent workability, and a simple structure of each member.
It can be manufactured and provided at low cost.

According to the second aspect of the present invention, the connecting surface has an uneven surface, and the inner wall of the tube is bitten by the unevenness at the time of connecting, so that the connecting force is further increased and the tube can be completely prevented from coming off.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a combined state.

FIG. 2 is an end view of a flange portion.

FIG. 3 is a sectional view of the disassembled state.

FIG. 4 is a sectional view of a first step of the joining operation.

FIG. 5 is a sectional view of a second step.

FIG. 6 is a sectional view of a third step.

FIG. 7 is a sectional view of a fourth step.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joint main body 2 Outer ring 3 Flange 4 Connection surface 5 Groove

Claims (2)

[Claims] 1. A pipe comprising a joint body, an outer ring, and a flange, wherein a pipe end is forcibly fitted outside a coupling surface of the joint body and an outer ring is forcibly fitted outside thereof. Hold the end between the coupling surface and the outer ring and fix it.
In addition, a joint for a soft synthetic resin pipe in which the flange has a split structure and is attached to the end of the joint body. 2. The joint for a flexible synthetic resin pipe according to claim 1, wherein the joint surface of the joint main body has an uneven surface, and the inner wall of the pipe bites into the uneven surface during the joint.