JPH025175Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to pipe joints.

Conventionally, in order to connect pipes of different diameters, as shown in FIG. Annular watertight rubber packings 4 and 5 are interposed between the inner surface of the socket of the large diameter pipe 1, the inner surface of the socket of the joint pipe 3, and the outer surface of the socket of the small diameter pipe 2, respectively. 8 through bolt nut 7,9
It was fixed with pressure. For this reason, there were disadvantages in that the number of parts was large, the connection workability was poor, the work was time-consuming, and it was not economical.

The purpose of this invention is to eliminate the drawbacks of the conventional fittings mentioned above and to provide a pipe joint that can efficiently connect pipes of different diameters with a small number of parts.

In order to achieve the above object, this invention has a widening part 14 through an annular step part 13 facing outward on the inner surface of the tip part.
is formed, a tapered part 15 that expands outward is formed at a position at a predetermined distance in the distal direction from this widened part, and an annular guide part 17 is formed that extends from the distal end of this tapered part in the tube axis direction. , the inner surface of the socket of the large-diameter pipe 11 having a socket 19 formed with an annular flange 18 projecting outward from the guide part, and the small-diameter pipe 12 having a socket 20 at the rear end.
An annular elastic packing 21 is provided between the outer surface of the insertion port and the outer surface of the insertion port.
37 and 39 are interposed, and this packing is disposed at a position facing the flange 18, and is inserted through a press ring 33 having a tapered part 33' opposite to the tapered part 33' at an inner peripheral position facing the tapered part 15. It is a pipe joint that is pressed and fixed by a bolt nut 35, and the insertion end of the small diameter pipe 12 is connected to the socket 1 of the large diameter pipe 11.
The gaskets 21, 37, and 39 are fitted to a position that almost coincides with the annular step 13 of the large diameter pipe, and the gaskets 21, 37, and 39 are inserted a predetermined distance from the socket 19 in the pipe axis direction from one side of the annular step 13 of the large diameter pipe. a first guide portion 25 that extends in the tube axis direction and has an outer surface extending from the one side to the other side with an outer diameter slightly smaller than that of the expanded portion 14; A second portion is inclined outward from the tip of the guide portion and abuts on the tapered portion 15.
A tapered portion 27, a second guide portion 28 extending from the tip of the second tapered portion in the tube axis direction with an outer diameter slightly smaller than that of the guide portion 17, and a taper of the press ring 33 that inclines inward from the tip of the second guide portion. It should be noted that it is formed by a third tapered part 29 that the part 33' comes into contact with, and a third guide part 30 extending in the tube axis direction from the tip of this third tapered part with an outer diameter slightly smaller than the inner diameter of the press ring 33. Features.

The configuration of this invention will be described below with reference to embodiments shown in the drawings.

Fig. 2 shows an embodiment in which pipes of different diameters are horizontally piped, and Fig. 3 shows a partially cutaway front view of an elastic packing used to connect the pipes. On both sides, 11 is a large diameter tube, and 12 is a small diameter tube. The inner surface of the tip of the large-diameter pipe 11 has an annular step 1 facing outward.
A widened portion 14 is formed through the widened portion 14, and a tapered portion 15 that expands outward is formed at a position a predetermined distance from the widened portion 14 in the distal direction via an annular stepped portion 16. An annular guide portion 17 is formed extending substantially horizontally from the tip thereof, and an annular flange 18 is formed outwardly projecting from the guide portion 17, and a socket 19 is formed at each of these portions. At the rear end of the small-diameter pipe 12, there is an inlet 20 with the same diameter as the pipe.
is formed. An annular elastic packing 21 made of a material such as rubber is interposed between the outer surface of the insertion port 20 of the small diameter tube 12 and the inner surface of the socket 19 of the large diameter tube 11. The elastic packing 21 is formed with a large wall thickness, and the inner diameter D ₁ is the same as the insertion opening 2 of the small diameter pipe 11.
The length is formed to be slightly smaller than the outer diameter D ₂ of 0, and extends from one side located at the annular step 13 of the large diameter pipe 11 to the other side located a predetermined distance protruding from the socket 19 in the pipe axis direction. The inner diameter edge on the other side is formed into a tapered portion 23 that expands outward. The outer surface of the packing 21 from one side to the other includes a tapered portion 24 that slopes outward from a position of the annular stepped portion 13 to a position near the tip of the expanded portion 14, and a tapered portion 24 that expands from the tip of the tapered portion 24. Opening 1
a guide portion 25 extending substantially horizontally with an outer diameter slightly smaller than 4; a tapered portion 27 that slopes outward from the tip of the guide portion 25 via an annular step portion 26 and abuts the tapered portion 15 of the socket 19; A guide portion 28 extending substantially horizontally from the tip of the tapered portion 27 with an outer diameter slightly smaller than that of the guide portion 17, a tapered portion 29 that inclines inward from the tip of the guide portion 28 and is in contact with a press ring to be described later; It is formed by a guide portion 30 extending substantially horizontally from the tip of the portion 29 with an outer diameter slightly smaller than the inner diameter of the press ring.

Reference numeral 33 denotes a push ring which is fitted into the socket 20 at a position facing the flange 18 of the socket 19, and whose inner diameter is formed to be approximately the same diameter as the expanded portion 14. A tapered part 33' opposite to the tapered part 15 is formed at the inner circumferential side of the push ring 33 facing the tapered part 15 of the socket 19, and between the outer flange 34 of the push ring 33 and the flange 18. is the bolt nut 3 for pressing and fixing the packing 21
5 are attached in the circumferential direction.

Next, a procedure for connecting the large diameter pipe 11 and the small diameter pipe 12 using the elastic packing 21 as described above will be explained.

After the press ring 33 is inserted into the insertion port 20 of the small diameter pipe 12, a lubricant such as soapy water is applied to the outer surface of the insertion port 20 to make it easier to insert the gasket 21. After doing this, insert the gasket 21 into the socket 2 from the other end.
0, and stop the insertion when one end is located at the edge of the insertion port 20. At the time of this insertion, since the gasket 21 has a tapered portion 23, the insertion can be made without difficulty. After that, Patsukin 2 as mentioned above.
1 inserted into the insertion opening, first by the guide part 25 and the expanded part 14, then by the guide part 28 and the guide part 17.
Center the large-diameter pipe 11 with
bring it into contact with. Next, the press ring 33 is brought into contact with the taper part 29 with its taper part 33' while centering the guide part 30 and its inner diameter. After doing this, the press ring 33 is inserted from the flange 18 side of the socket 19.
A bolt is inserted into the flange 34 of the bolt, and a nut is screwed into the bolt to press and fix the packing 21.

All the connection construction work has been completed as described above, and the relatively large gap created between the socket 19 and the insertion port 20 of both the pipes 11 and 12 is filled with the thick gasket 21.
It will be buried and connected piping will be installed to keep it watertight. Even if expansion/contraction or bending force is applied to the connection part due to heat or vibration after piping, the seal 2
It is absorbed by the length and thickness of 1, and the connection part will not come off.

FIG. 4 shows another embodiment of the elastic packing, and this packing 37 has an inlet 2 for the small diameter pipe 12 at one end edge.
This embodiment differs from the previous embodiment in that an inward flange 38 having the same thickness as the pipe thickness of 0 is provided, and other parts are the same. When such a packing 37 is used, the flange 38 can reliably prevent the insertion port 20 of the small diameter pipe 12 from entering the socket 19 of the large diameter pipe 11, and its positioning becomes easy. When piping is arranged vertically so that the caliber tube 12 faces upward, there is an advantage that the position of the small caliber tube 12 can be maintained and the piping becomes simple.

FIG. 5 shows yet another embodiment of the elastic packing, in which the axis of the inner diameter is located at the large-diameter pipe 1.
1, and when connected, the edge of the small diameter pipe 12 on the eccentric side touches the annular stepped portion 1 of the large diameter pipe 11.
3, the bottoms of both tubes are aligned and in contact with each other, and there is no tapered portion 24 as described above, and the guide portion 2
This embodiment is different from the embodiment described above in that the numeral 5 extends to the other edge, and the other parts are the same. By using such a packing 39, it is possible to eliminate to some extent the problem of piping space on the small-diameter pipe 12 side, and since there is no step or gap at the bottom of both pipes 11 and 12, the pipes 11 and 12 can be made small as shown by the arrows. There is an advantage that even if there is foreign matter flowing in from the diameter pipe 12 side, it can flow smoothly to the large diameter pipe 11 side without stagnation.

In each of the above embodiments, an example was given in which pipes of different diameters were horizontally piped, but it goes without saying that vertical pipes may also be used, and the inner diameter of the elastic packing may vary depending on the outer diameter of the small diameter pipe. This makes it possible to connect various small diameter pipes to the same large diameter pipe.

Since this idea is as described above, there is no need to use conventional joint pipes, it is possible to efficiently connect pipes of different diameters while maintaining watertightness, and the work time can be greatly shortened. It also has excellent bending resistance. In addition, when connecting, the insertion end of the small diameter pipe is inserted to a position that almost coincides with the annular step of the socket of the large diameter pipe, so that, for example, the axial direction of the flow from the small diameter pipe to the large diameter pipe is Since no gaps are formed, there is little possibility that incoming foreign matter will stagnate and cause flow obstruction or pipe corrosion. Furthermore, the elastic packing has a length extending from one side of the annular step side of the large diameter pipe to the other side protruding from the socket by a predetermined distance in the tube axis direction, and the elastic packing has a length extending from one side of the annular step side of the large diameter pipe to the other side protruding from the socket by a predetermined distance, and Since the compressive force is applied between the taper part of the push ring that contacts the socket and the taper part of the socket, a large amount of compression can be taken not only on the outer circumference side but also on the inner circumference side that contacts the outer surface of the socket. Sealing performance can be significantly improved even under high water pressure without requiring a complicated structure as in the past. Furthermore, when preparing the connection, as long as the edge of the insertion port and the other edge of the packing are aligned, the insertion position of the insertion port into the socket can be determined automatically, and the insertion allowance for small diameter pipes can be adjusted one by one. There is no need to measure, and it is easy to determine the length of piping, so it is extremely easy to install and work. Furthermore, the outer surface of the elastic packing has first and third
A guide part is formed, and the first guide part makes it easy to center the socket, and the third guide part makes it easy to center the push ring, making it possible to smoothly insert the socket into the socket. In addition to this, there are various excellent effects such as being economical, such as lower production and construction costs because the number of parts is reduced.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of the main part showing an example of a conventional connecting part of pipes with different diameters, Fig. 2 is a longitudinal sectional front view of a connecting part of pipes with different diameters using the elastic packing of this invention, and Fig. 3
The figure is a partially cutaway front view of an elastic packing, and FIGS. 4 and 5 are longitudinal sectional front views of connecting portions of pipes of different diameters in which different elastic packings are used. 11...Large diameter pipe, 12...Small diameter pipe, 13,
16, 26... Annular step part, 14... Expansion part, 1
5, 23, 24, 27, 29... Taper part, 17
... Guide part, 18 ... Annular flange, 19 ... Socket, 20 ... Socket, 21, 37, 39 ... Elastic packing, 24, 28, 30 ... Guide part, 33 ...
...Push ring, 35...Boltnut.

Claims (1)

[Claims for Utility Model Registration] A widened portion 14 is formed on the inner surface of the distal end through an annular stepped portion 13 facing outward, and the widened portion 14 is outwardly expanded from the widened portion to a position at a predetermined interval in the direction of the distal end. A tapered portion 15 is formed, an annular guide portion 17 is formed extending from the tip of this tapered portion in the tube axis direction, and an annular flange 1 is further extended outward from this guide portion.
An annular elastic packing 21, 37, 39 is interposed, and this packing is disposed at a position facing the flange 18, and the bolt nut 35 is inserted through a press ring 33 having a tapered part 33' opposite to the tapered part 33' at an inner peripheral position facing the tapered part 15. It is a pipe joint that is press-fixed by
The gaskets 21, 37, and 39 are fitted to a position that almost coincides with the annular step 13 of the large diameter pipe, and the gaskets 21, 37, and 39 are inserted a predetermined distance from the socket 19 in the pipe axis direction from one side of the annular step 13 of the large diameter pipe. a first guide portion 25 that extends in the tube axis direction and has an outer surface extending from the one side to the other side with an outer diameter slightly smaller than that of the expanded portion 14; A second portion is inclined outward from the tip of the guide portion and abuts on the tapered portion 15.
A tapered portion 27, a second guide portion 28 extending from the tip of the second tapered portion in the tube axis direction with an outer diameter slightly smaller than that of the guide portion 17, and a taper of the press ring 33 that inclines inward from the tip of the second guide portion. It should be noted that it is formed by a third tapered part 29 that the part 33' comes into contact with, and a third guide part 30 extending in the tube axis direction from the tip of this third tapered part with an outer diameter slightly smaller than the inner diameter of the press ring 33. Characteristic pipe fittings.