JPH05322077A - Pipe coupling - Google Patents

Abstract

PURPOSE:To provide a pipe coupling made of an FRP which has an accurate flange with no warping and no distortion. CONSTITUTION:This is a pipe coupling 1 made by forming a flange 21 at the desired end of a pipe coupling main body 3, and it has a flange member 2 which consists of a hard vinyl chloride resin, and a coupling main body 3 which consists of an FRP and has a connection 31 with the flange member 2. The flange member 2 has a flange 21 having a flange face 20, and a short pipe 22 projecting from the flange 21, and a groove 23 is formed on the outer peripheral surface of the short pipe 22. Furthermore, an elastic body 4 is provided in the groove 23, the connection part 31 of the flange main body 3 is provided to cover the outer peripheral surface of the short pipe 22, and they are incorporated so that the connection part 31 bites into the groove 23 by pressing the elastic body 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an F having a flange surface.
The present invention relates to a pipe joint made of RP.

[0002]

2. Description of the Related Art Generally, a pipe joint in which a flange portion is formed at a predetermined end of a joint body is known.

Conventionally, as such a pipe joint, as shown in FIG. 5, as in the joint body b, the flange portion c is entirely made of FRP, or an iron plate is used as a core material in the flange portion b. It is known that the interior is decorated. In such a pipe joint a, when the flange portion b is connected to the flange portion e of the cast iron valve d, for example,
Connection is made by tightening the flange parts b and e with a predetermined tightening torque.

[0004]

By the way, in the case of the above-mentioned conventional pipe joint a, since the whole is made of FRP, the flange portion b is likely to be warped or distorted. In addition, when the torque wrench is not prepared at the construction site, the flange portions b and e are likely to be excessively tightened. Therefore, a pipe joint a made of FRP
Cracks f are likely to occur on the side flange portion b, which causes inconvenience such as water leakage during water passage.

The present invention has been made in view of the above circumstances, and is an F having a highly accurate flange portion without warping or distortion.
The purpose is to provide a pipe joint made of RP.

[0006]

The pipe joint of the present invention for solving the above-mentioned problems is a pipe joint in which a flange portion is formed at a desired end portion of a joint body, and is made of hard vinyl chloride resin. A flange member; and a joint main body made of FRP and having a connection portion with the flange member, the flange member having a flange portion having a flange surface, and a short pipe portion protruding from the flange portion, A groove is formed on the outer peripheral surface of the short tube portion, and an elastic body is provided in the groove,
The outer peripheral surface of the short pipe portion is covered with the connecting portion of the joint body, and the connecting portion is integrated so as to press the elastic body and bite into the groove portion.

[0007]

According to the present invention, since the flange member made of hard vinyl chloride resin and the joint body made of FRP are integrated, a flange surface excellent in precision is formed by the hard vinyl chloride resin. Further, since the outer peripheral surface of the short pipe portion is covered with the connecting portion of the joint main body and the connecting portion is integrated so as to press the elastic body and bite into the groove portion, water pressure is applied to the joint to remove force. There is no need to worry about being pulled out even when is activated.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an outline of the main structure of the pipe joint 1.

That is, the pipe joint 1 has a flange portion 2
1 and a flange member 2 having a short pipe portion 22 and a joint body 3 having a connecting portion 31. The connecting portion 31 of the joint body 3 is provided so as to cover the short pipe portion 22 of the flange member 2. Are integrated.

As shown in FIG. 2, the flange member 2 has a flange portion 21 having a flange surface 20 and a short pipe portion 22 projecting from a surface opposite to the flange surface 20,
It is made of hard vinyl chloride. Of these, a groove portion 23 is formed on the outer peripheral surface of the short tube portion 22 along the circumferential direction, and an elastic body 4 made of an elastic material such as a rubber ring is fitted in the groove portion 23. This flange member 2
Can be molded by injection molding or the like, and the flange surface 20 having excellent accuracy can be formed by injection molding.

The joint body 3 has a connecting portion 31 for connecting to the flange member 2 at a desired end portion of the joint body 3 and is entirely formed of FRP. The connecting portion 31 is coated on the outer peripheral surface of the short pipe portion 22 of the flange member 2, and in this coating state, the portion in contact with the elastic body 4 presses the elastic body 4 as shown in FIG. Groove 23
It is designed to cut in.

As a method of manufacturing the pipe joint 1 thus configured, the flange member 2 is prepared in advance, and the FRP layer is laminated on the short pipe portion 22 of the flange member 2 while forming the connection portion 31. This can be achieved by forming the entire joint body 3. That is, while the FRP layers are laminated in the predetermined axial direction and the circumferential direction, the joint body 3
When the FRP layers are laminated while covering the short tube portion 22 of the flange member 2 when forming the elastic member 4, the elastic body 4 is pressed by the winding tension of the reinforcing fiber (not shown) in the FRP layer wound in the circumferential direction. As a result, the FRP layer bites into the groove 23. For example, as shown in FIG. 4, the short pipe portion 2 of the two flange members 2 having different diameters is used.
By forming the curved pipe-shaped joint main body 3 while covering the curved pipe 2, the different-diameter bend joint 1 having the flange surfaces 20 at both ends is formed.
0 can be formed.

The shape of the pipe joint 1 is not limited to the different diameter bend joint 10 as described above, but the joint body 3 having various shapes is formed when the joint body 3 is formed. By connecting the flange member 2 to a desired end of the pipe joint 1, various shapes of the pipe joint 1 can be formed.

When strength is required for the connection between the flange member 2 and the joint body 3, the short pipe portion 2 of the flange member 2 is previously formed before the FRP layers of the joint body 3 are laminated.
By applying a primer (not shown) to 2 in advance, the connection strength between the short tube portion 22 of the flange member 2 and the connection portion 31 of the joint body 3 can be increased.

[0016]

As described above, according to the present invention, it is possible to form a highly accurate flange surface with a hard vinyl chloride resin, so that the flange portion may be tightened excessively. Also, it is possible to avoid the destruction of the flange portion and prevent water leakage during water passage.

Further, even if water pressure is applied to the inside of the joint and a pulling force is applied, there is no concern that the flange member and the joint body may come off. Therefore, various flange members and joint body combinations may be used. It can be used as a joint and the pipeline can be freely designed.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing an outline of a main configuration of a pipe joint.

FIG. 2 is a partially cutaway side view showing the outline of the overall configuration of a flange member.

FIG. 3 is a partial enlarged cross-sectional view showing a connection state between a short pipe portion and a connection portion.

FIG. 4 is a plan view showing a bend joint which is an example of a pipe joint.

FIG. 5 is a plan view and a cross-sectional view taken along line AA showing a conventional pipe joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe joint 10 Different diameter bend joint (pipe joint) 2 Flange member 20 Flange surface 21 Flange portion 22 Short pipe portion 23 Groove portion 3 Joint body 31 Connection portion 4 Elastic body

Claims (1)

[Claims] 1. A pipe joint in which a flange portion is formed at a desired end portion of the joint body, the joint body including a flange member made of a hard vinyl chloride resin and an FRP and having a connection portion with the flange member. The flange member has a flange portion having a flange surface and a short pipe portion projecting from the flange portion, and a groove portion is formed on an outer peripheral surface of the short pipe portion, and an elastic member is formed in the groove portion. A pipe provided with a body, the outer peripheral surface of the short pipe portion being covered with a connecting portion of the joint body, and the connecting portion being integrated so as to press the elastic body and bite into the groove portion. Fittings.