JPH11108267A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the coping with joining work with a single joint even when pipes which must be connected in a joint part are in the external diametric dimension changed over many kinds. SOLUTION: In this pipe joint, in an internal periphery of an opening end of a socket 4, a tapered seal material press contact surface 10 is formed, between the press contact surface 10 and a peripheral surface of spigot 8, an annular seal material 18 is arranged, to be externally fitted to the spigot 8, also by a press ring 14 tightened to an end part of the socket 4, the seal material 18 is compressed between the socket and the spigot. The seal material 18 is formed in a circular cross section, a kind of a pipe 6 is changed, when an external diameter of the spigot 8 is changed, the constitution matching with the change is provided so that a contact point 35 of the seal material press contact surface 10 and the seal material 18 can be moved along a taper of the seal material press contact surface 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint, and more particularly to a pipe joint used for a connecting ring for joining different kinds of pipes.

[0002]

2. Description of the Related Art A polyethylene pipe is expected to be used as a new pipe for a drainage pipe for water supply. In this case, it is necessary to connect the end of the newly installed polyethylene pipeline to an existing pipeline network such as a ductile pipe or a vinyl chloride pipe.

[0003] Since polyethylene pipes for water distribution are generally joined by electric fusion, after the pipes are laid, the entire pipes have an integral structure, and exhibit seismic performance. For this reason, it is necessary that the end of the new polyethylene pipeline has an integral structure having the same performance as the middle of the pipeline. That is, a joint for joining a polyethylene pipe and another kind of pipe includes:
The polyethylene pipe is required to have a detachment prevention performance that withstands a tensile force that generates a stress equal to the yield strength of the material.

[0004] In order to satisfy such demands, it is preferable to join these polyethylene pipes and other kinds of pipes by a connecting ring having a detachment preventing function. In this case,
It is expected that other types of pipes will be of various types, such as ductile pipes and vinyl chloride pipes, as described above. Therefore, the above-mentioned connecting ring must be able to cope with such various kinds of pipes.

[0005]

However, different types of pipes such as ductile pipes and vinyl chloride pipes generally have different outer diameters of the pipes even if the nominal diameters are the same. Therefore, a connecting ring that merely constitutes a joint assuming a dimensional change of about one kind of pipe type having an outer diameter tolerance width cannot cope with a change in pipe type. For this reason, there is a problem in that it is necessary to prepare a variety of pipes having different configurations and dimensions according to the pipe type.

Accordingly, an object of the present invention is to make it possible to cope with a variety of pipes to be joined at a joint portion and to cope with a change in the outer diameter by using one kind of joint.

[0007]

SUMMARY OF THE INVENTION In order to achieve this object, the present invention is directed to a receptacle formed at the end of one tube joined to one another and an insertion formed at the end of the other tube. In a pipe joint in which a port is inserted, a tapered sealing material pressure contact surface is formed on the inner periphery of the opening end of the receiving port, and an annular sealing material is provided between the pressure contact surface and the outer peripheral surface of the insertion port. Arranged, the sealing material is configured to be compressible between the receiving openings by a pressing ring fastened to the end of the receiving opening while being fitted to the receiving opening,
When the sealing material is formed into a circular cross section and the outer diameter of the insertion port changes due to a change in the pipe type of the other pipe, the contact between the sealing material pressing surface and the sealing material changes accordingly. It is configured to be able to move along the taper of the press contact surface.

With such a configuration, when the type of the other pipe changes and the outer diameter of the insertion port changes, the contact between the sealing material pressing surface and the sealing material changes accordingly. Because it was configured to be able to move along the taper of
With one type of joint, it is possible to cope with a change in the outer diameter of the insertion hole due to a change in the pipe type.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. 1 and 2, reference numeral 1 denotes a connecting ring according to the present invention, which has a structure in which receiving ports 3, 4 are formed at both ends of a pipe 2 made of cast iron. Insertions 7 and 8 of the other tubes 5 and 6 are inserted into the receiving ports 3 and 4, respectively. Tube 5 is a polyethylene tube and tube 6
Are ductile cast iron pipes and vinyl chloride pipes. Less than,
In principle, the pipe 6 will be described as a ductile cast iron pipe.

On the inner periphery of the opening end of the receiving port 3 into which the polyethylene pipe 5 is inserted, a tapered sealing material press-contact surface 9 which is tapered toward the back is formed. Similarly, on the inner periphery of the opening end of the receiving port 4 into which the ductile cast iron pipe 6 is inserted, a tapered sealing material pressure contact surface 10 which is also tapered deeper, and which is more inclined than the sealing material pressure contact surface 9. Things are formed. Flanges 11, 11 are formed on the outer periphery of the open ends of the receiving ports 3, 4.

Press rings 13 and 14 are fitted on the outer periphery of the insertion ports 7 and 8 outside the receiving ports 3 and 4. As shown in FIG. 2, a plurality of these pressing rings 13 and 14 are provided with a plurality of T-head bolts 15 and nuts 16 arranged in the circumferential direction along the pipe axis.
By being fastened to the flanges 11 of the receptacles 3 and 4, an annular rubber sealing material is formed between the press contact surfaces 9 and 10 of the receptacles 3 and 4 and the outer peripheral surfaces of the insertion ports 7 and 8. 17 and 18 are compressed so that a required sealing function can be achieved. The sealing material 17 for the polyethylene pipe 5 is formed so as to have a substantially triangular cross section, and the sealing material 1 for the ductile cast iron pipe 6.
8 is formed so that the cross section becomes circular.

In the insertion portion of the ductile cast iron pipe 6, a back cover ring 19 is provided between the receiving port 4 and the insertion port 8 on the back side of the sealing material 18. A front cover ring 20 is provided between the seal member 18 and the pressing wheel 14. That is, by sandwiching the seal member 18 between the back cover ring 19 and the front cover ring 20, the seal member 18 is configured to be backed up on both sides in the tube axis direction.

Each of the back cover link 19 and the front cover ring 20 is made of nylon and is divided in a circumferential direction. 19a and 20a are:
This is the division. These divisions 19a, 20a
It is formed in a slit shape that is greatly inclined with respect to the tube axis direction.

That is, as described above, various types of pipes 6 such as ductile pipes and vinyl chloride pipes are applied as the pipes 6 inserted into the receiving port 4, and if the pipe types are different, even if the nominal diameters are the same, the outer diameters are different. Usually, the diameters are different. Therefore,
Both the back cover link 19 and the front cover ring 20 are made of highly elastic nylon so that they can follow the outer diameter of the tube 6 even if the outer diameter is different as shown in FIG. . Also, the dividing unit 19a,
By forming the slit 20a in a slit shape that is greatly inclined with respect to the pipe axis direction, even if the circumferential dimension of the divided portions 19a and 20a is increased in accordance with the outer diameter of the pipe 6, this split The configuration is such that the backup performance of the sealing material 18 in the portions 19a and 20a does not significantly decrease.

On the outer periphery of the back cover link 19 and the front cover ring 20, tapered surfaces 19b, 20b corresponding to the tapered sealing material pressure contact surface 10 in the receiving port 4 are provided.
The back cover link 19 and the front cover ring 20 are configured so as to be properly interposed between the seal material pressing surface 18 and the outer peripheral surface of the insertion opening 8 with the seal material 18 being backed up. I have.

The sealing member 18 is also elastic since it is made of rubber, and expands and contracts in accordance with the outer diameter of the tube 6 so that it is always in close contact with the outer periphery of the insertion opening 8. ing. Tapered sealing material pressure contact surface 10 at receiving port 4
Is formed at such a large angle that the outer peripheral portion of the sealing material 18 can contact even when the sealing material 18 expands and contracts in the radial direction following the change in the outer diameter of the pipe 6 as described above.

As shown in FIG. 1 and FIG.
14 is provided with an annular groove 2 having a rectangular cross section in the circumferential direction.
2 and 23 are respectively formed. And each annular groove 2
The separation prevention rings 24, 25 made of steel, which are rectangular in cross section in the circumferential direction and are tight and tight, are fitted into the parts 2 and 23. Set bolts 26 are screwed into the press rings 13 and 14 from the outer peripheral side toward the annular grooves 22 and 23, respectively. The distal end surfaces of the set bolts 26 press the outer surfaces of the separation prevention rings 24 and 25. The detachment prevention rings 24 and 25 can be pressed against the outer peripheral surfaces of the insertion openings 7 and 8. Set bolt 26
Are provided at a plurality of positions in the circumferential direction avoiding the T-head bolt 15.

As shown in detail in FIG. 4, a circumferential blade 28 is integrally formed on the inner circumference of one end and the other end in the tube axis direction of the separation preventing rings 24 and 25, respectively. This blade portion 28 is, as described above,
The configuration is such that when the set 4 and 25 are pushed by the set bolt 26, they are cut into the outer peripheral surfaces of the insertion openings 7 and 8.

As shown in FIG. 1, the polyethylene pipe 5 is
Even if it has the same diameter as the ductile cast iron pipe 6, it is formed so as to have a large wall thickness. Therefore, the outer diameter of the polyethylene pipe 5 is different from that of the ductile cast iron pipe 6, and the outer diameter of the polyethylene pipe 5 is larger as shown in the figure. The pipe 2 has a tapered portion 32 corresponding to the difference in outer diameter between the two pipes 5 and 6.

Even if the polyethylene pipe 5 is formed with a larger wall thickness than the ductile cast iron pipe 6 as shown in the figure, it is difficult to reach the strength of the ductile cast iron pipe 6. Therefore, a metal inner core 33 for reinforcing the rigidity of the polyethylene pipe 5 in the portion of the insertion opening 7 which receives a radial force from the sealing material 17 and the separation prevention ring 24 from the inner surface.
Has been fitted. The inner core 33 is made of stainless steel or the like from the viewpoint of anticorrosion in order to come into contact with water in the pipe, and a flange 34 is formed at one end thereof. The inner core 33 is configured to be positioned in the tube axis direction when the flange 34 contacts the end face of the insertion opening 7.

Receiving ports 3 and 4 of connecting ring 1 having such a configuration
When joining the openings 7 and 8 of the polyethylene pipe 5 and the ductile cast iron pipe 6, the press rings 13 and 14 and the sealing materials 17 and 18 are fitted in the openings 7 and 8 in advance. The press rings 13 and 14 are fitted to the insertion openings 7 and 8 with the ring prevention grooves 24 and 25 attached to the annular grooves 22 and 23, respectively. Further, the back cover ring 19 and the front cover ring 20 are also fitted in the insertion opening 8. And
In this state, the insertion ports 7 and 8 are inserted into the reception ports 3 and 4.

Next, the pressing rings 13 and 14 are fastened to the flanges 11 of the receiving holes 3 and 4 by the T-head bolt 15 and the nut 16. Then, the pressing members 13 and 14 allow the sealing material 1
7, 18 are compressed. Also, set bolt 26 to pressing wheel 1
By screwing into rings 3 and 14, detachment prevention rings 24 and 25
Is pressed inward in the radial direction so that the blade portion 28 bites into the outer peripheral surfaces of the insertion openings 7 and 8. Thereby, the separation prevention ring 24,
25 and the insertion holes 7 and 8 are integrated, and the required separation prevention function is achieved.

That is, the polyethylene pipe 5 is joined to the ductile cast iron pipe 6 via the connecting ring 1 in a state where a required separation preventing function is provided between the receiving ports 3 and 4 and the insertion ports 7 and 8. Will be.

FIG. 3 shows that, as described above, different types of pipes 6 have different outer diameters even if the nominal diameter is the same. According to the present invention, even if the outer diameter of the pipe 6 is different, the sealing material 18 and the cover rings 19 and 20 expand and contract following the same, and the sealing material has a circular cross section with the press contact surface 10. Since the contact point 35 with the contact member 18 moves along the taper of the pressure contact surface, it is possible to cope with a change in the outer diameter of the pipe 6 while keeping the compression ratio of the sealing material 18 constant. Therefore, even if the pipe type is different, a reliable sealing property can always be obtained.

In the above description, as the pipe joint of the present invention, a pipe joint used for a connecting ring 1 for joining different kinds of pipes has been exemplified. However, the present invention is not limited to this, and is applicable to other pipe products. It is possible.

[0026]

As described above, according to the present invention, a tapered sealing material pressing surface is formed on the inner periphery of the opening end of the receiving port, and an annular seal is formed between the pressing surface and the outer peripheral surface of the insertion opening. The sealing material is arranged so that it can be compressed between the socket openings by a press ring which is fitted into the insertion opening and fastened to the end of the reception opening, and the sealing material is formed in a circular cross section. Then, when the pipe type of the insertion port changes and its outer diameter changes, the contact point between the sealing material pressing surface and the sealing material can move along the taper of the sealing material pressing surface accordingly. The joint consisting of one kind of receptacle can cope with a change in the outer diameter of the insertion port due to a change in the pipe type. For this reason, for example, when there are two types of ducts, i.e., ductile pipes and vinyl chloride pipes having different outer diameters, as the insertion pipe, the joint can be shared.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a connecting ring for joining different kinds of pipes provided with a pipe joint according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the connecting ring shown in FIG.

FIG. 3 is a diagram showing a state when the outer diameter of the insertion opening changes in the pipe joint of FIG. 1;

FIG. 4 is an enlarged view showing a pressing wheel and a separation prevention ring in FIG. 1;

[Explanation of symbols]

 2 Pipe 4 Receptacle 6 Ductile cast iron pipe 8 Insert 10 Sealing material press contact surface 14 Press ring 18 Sealing material 19 Back covering 20 Front covering

Claims (1)

[Claims] 1. A pipe joint in which an insertion opening formed at an end of another pipe is inserted into a reception opening formed at an end of one pipe joined to each other. Form a tapered sealing material pressure contact surface on the inner periphery of the opening end of the receiving port, arrange an annular sealing material between this pressure contact surface and the outer peripheral surface of the insertion port,
The sealing material is configured to be compressible between the receiving port openings by a pressing ring fastened to the insertion port and fastened to the end of the receiving port, and the sealing material is formed in a circular cross section, and the other end is formed. When the outer diameter of the insertion port changes due to a change in the type of pipe,
A pipe joint characterized in that the contact point between the sealing material pressing surface and the sealing material can move along the taper of the sealing material pressing surface accordingly.