JPH09250668A - Captive fittings - Google Patents

Abstract

(57) An object of the present invention is to obtain a separation prevention pipe fitting suitable for resin pipes such as FRPM pipes. SOLUTION: Receptacle 1 of one pipe 11 to be joined to each other.
In the pipe joint in which the insertion port 14 of the other pipe 13 is inserted into the inside of 2, the protrusion 19 is formed on the outer surface of the insertion port 14 at a position away from the receiving port 12, and one end Prevention members 20, 24, 29, 28 that are physically connected
The other end 23 can be engaged with the protrusion 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a separation prevention pipe joint particularly applied to a resin pipe.

[0002]

2. Description of the Related Art Pipe fittings for resin pipes such as FRPM pipes generally have a receiving structure as shown in FIG. That is, in FIG. 5, one of the pipes 1 joined to each other
The receiving end 2 is formed at the end of the
An insertion port 4 to be inserted inside the receiving port 2 is formed. An annular rubber seal material 5 is arranged between the inner peripheral surface of the receiving opening 2 and the outer peripheral surface of the insertion opening 4.
The required sealing function is achieved by being compressed between the receiving and inserting openings. The sealing material 5 is configured to be adhered to either the inner peripheral surface of the receiving opening 2 or the outer peripheral surface of the insertion opening 4. In the example of FIG. Has been done.

Such a pipe joint of a resin pipe such as a FRPM pipe is excellent in stretchability and flexibility, and has an advantage that it can easily follow a ground change during an earthquake.

[0004]

However, due to the structure, there is no function to prevent the joints from coming out from each other and the joints are not detached when a large fluctuation occurs locally. It has a problem that it may occur.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above problems and obtain a separation prevention pipe joint suitable for a resin pipe such as a FRPM pipe.

[0006]

To achieve this object, the present invention relates to a pipe joint in which the insertion port of the other pipe is inserted into the reception port of the one pipe to be joined to each other. Form a protrusion on the outer surface of the insertion slot at a position away from
The other end of the separation preventing member whose one end is mechanically connected to the receiving port can be engaged with the protrusion.

With such a structure, when a withdrawal force is applied between the receiving opening and the receiving opening, the other end of the detachment preventing member whose one end is mechanically connected to the receiving end is the protrusion of the insertion opening. Engagement prevents the two from coming off.

Since the protrusion of the insertion slot is formed at a position distant from the receiving slot, an expansion and contraction allowance is provided between the receiving slot and the insertion slot, so that the protrusion is separated from the end face of the receiving slot. It is possible to expand and contract between the socket and the socket until it engages with.

[0009]

1 and 2 show a first embodiment of the present invention.
An embodiment will be described. Here, 11 is one of the pipes joined to each other, and a receiving port 12 is formed at one end thereof. 13 is a tube
It is the other tube joined to 11, and has the same structure as the tube 11, and has an insertion opening 14 formed at the other end. An annular rubber sealing material 15 is fixed to the outer periphery of the tip of the insertion opening 14 by means such as adhesion. This sealing material 15 exerts a required sealing function by being compressed between the inner peripheral surface 16 of the receiving opening 12 when the insertion opening 14 is inserted into the receiving opening 12 as shown in the figure. . A taper surface 17 is formed on the inner circumference of the opening end of the receiving port 12 to guide the insertion of the sealing material 15 into the receiving port 12.

An annular projection 19 is formed on the outer periphery of the insertion opening 14 at a position spaced from the end surface 18 of the receiving opening 12 in the axial direction. The protrusion 19 is formed by stacking FRP materials or the like.
It is formed over the entire circumference of the outer surface of 14, and is formed so that its cross section is rectangular. On the outer periphery of the receptacle 12 near the end face 18, a similar annular protrusion 20 having a rectangular cross section is formed over the entire periphery.

Flange 23 and 24 are respectively provided on the outer periphery of the insertion port 14 at a position farther from the receiving port 12 than the protrusion 19 and the outer periphery of the receiving port 12 at a position farther from the end face 18 than the protrusion 20. It is Each of these flanges 23 and 24 is divided into two in the circumferential direction, and the divided portion 25 is a bolt.
Joined by 27. Fig. 2 shows the flange on the insertion port 14 side.
23 is shown in detail. Both flanges 23 and 24 are provided with a plurality of bolts 28 and nuts circumferentially arranged in the axial direction of the pipe.
Connected to each other by 29.

As shown in FIG. 1, the flange 23 engages with the projection 19 of the insertion opening 14, the flange 24 engages with the projection 20 of the receiving opening 12, and the head of the bolt 28 engages with these flanges 23, 24. And the nut 29 are engaged with each other, the end face 18 of the socket 12 and the protrusion 19
And a distance D between them and. At this time, the insertion margin L of the insertion opening 14 is left behind in the receiving opening 12, and the dimension of the insertion margin L is set to be slightly larger than the distance D.

In such a structure, when the pipes 11 and 13 are joined together, the projection 19 is formed and the insertion port 14 to which the sealing material 15 is fixed is replaced with the receiving port in which the projection 20 is formed. 12
Insert inside. Then, the sealing material 15 is guided by the tapered surface 17 and enters the inside of the receiving opening 12, and the sealing material 15 is compressed between the receiving opening 12 and the insertion opening 14 to exert a required sealing function.

When the insertion port 14 is inserted into the receiving port 12 in this manner, the flanges 23 and 24 are attached to the insertion port 14 and the receiving port 12, respectively.
And the nut 29 is screwed together. Then, the flange 24 engages with the protrusion 20 of the receiving port 12, and the flange 23 engages with the protrusion 19 at a position spaced a distance D from the end face of the receiving port 12.

Therefore, when a pull-out force is applied between the receiving opening and the receiving opening, the flanges connected to each other in the pipe axial direction by the protrusions 10 and 20 and the bolt 28 and the nut 29.
The disengagement is prevented based on the engagement with 23 and 24.

In this state, the distance D is maintained between the projection 19 and the end face 18 of the receiving opening 12, and the insertion portion L of the insertion opening 14 is provided in the rear portion of the receiving opening 12 correspondingly. Because this protrusion
The receiving opening 12 and the insertion opening 14 can be freely expanded and contracted within a range in which the end surface 19 of the receiving opening 12 engages with the flange 23. Further, since the sealing material 15 has a certain thickness, it is possible to exhibit the same flexibility as the conventional one shown in FIG.

FIG. 3 shows a second embodiment of the present invention. Here, as shown in FIG. 1, the protrusion 20 of the socket 12 and this protrusion
Instead of providing the flange 24 that engages with 20, the internal thread 31 is formed in the socket 12 from the end surface 18 in the pipe axis direction, and this internal thread 31
It is configured to screw the bolt 28 into the 31. Other configurations are the same as those in FIGS. 1 and 2.

According to this structure, after the insertion port 14 is inserted into the receiving port 12, the flange 23 is fitted in the insertion port 14 and the bolt 28 passing through the flange 23 is screwed into the inner screw 31. This completes the joining of the joints. And also in this case,
Similarly, the detachment of the receiving opening 12 and the insertion opening 14 is prevented. Similarly, the joint portion can be made stretchable and flexible.

FIG. 4 shows a third embodiment of the present invention. Here, the pipe 11 has a pipe main body 33 having a uniform diameter, and a receiving member 34 is fitted on the outer periphery of one end of the pipe main body 33 and is integrated by adhesion or the like, so that the receiving port 12 Are formed.
A radial end surface 35 is formed at the end of the receiving member 34 on the side opposite to the open end of the receiving port 12. In FIG. 4, the flange 24 on the receiving side is configured to be externally fitted to the pipe body 33 and engage with the end surface 35 of the receiving member 34. Other configurations are the same as those in FIGS. 1 and 2.

According to this structure, the flange 24
Similarly, a detachment preventing function can be obtained by extending the bolt 28 between the flange 23 on the side of the insertion opening 14 on which the protrusion 19 is formed. Similarly, the joint portion can be made stretchable and flexible.

[0021]

As described above, according to the present invention, in the pipe joint in which the insertion opening of the other pipe is inserted into the reception opening of the one pipe to be joined to each other, the pipe joint is placed at a position away from the reception opening. Since the protrusion is formed on the outer surface of the insertion opening and the other end of the separation preventing member whose one end is mechanically connected to the receiving opening can be engaged with the protruding portion, the pulling force acts between the receiving opening. In this case, the other end of the separation preventing member whose one end is mechanically connected to the receiving port is engaged with the protrusion of the insertion port, whereby the separation of the both can be reliably prevented. Since the protrusion of the insertion slot is formed at a position away from the receiving slot, by providing an expansion and contraction allowance between the receiving slot and the insertion slot, this protrusion engages with the end surface of the receiving slot and the separation prevention member. It is possible to allow expansion and contraction between the receiving and inserting openings within the range of fitting.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a separation prevention pipe joint according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a portion shown in FIG.

FIG. 3 is a vertical sectional view of a separation prevention pipe joint according to a second embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view of a separation prevention pipe joint according to a third embodiment of the present invention.

FIG. 5 is a cross-sectional view of a conventional resin pipe joint.

[Explanation of symbols]

 11 Tube 12 Receptacle 13 Tube 14 Insertion port 19 Projection 20 Projection 23 Flange 24 Flange 28 Bolt 29 Nut

Claims (1)

[Claims] 1. A pipe joint in which an insertion port of another pipe is inserted into a reception port of one pipe to be joined to each other, and a protrusion is formed on an outer surface of the insertion port at a position distant from the reception port. A separation prevention pipe joint, wherein the separation prevention member, one end of which is mechanically connected to the receiving port, can engage the other end with the protrusion.