JPH0353107Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a joint for preventing deviation of pipes, and particularly to a joint for preventing deviation of pipes used in joints of water pipes, gas pipes, etc.

[Conventional technology]

In conventional pipe fittings of this type, a press ring is loosely fitted into the inner tube inserted into the end of the outer tube, and by pulling the press ring toward the outer tube, it presses the packing interposed between the two tubes. It is known that this was done. However, in this structure, the press ring that presses the packing loosely fits into the inner pipe, so the inner
When both outer pipes move in the extraction direction, this cannot be prevented, and if vibrations such as an earthquake are applied, both pipes will deviate from each other, and the packing will be pushed to one side, causing water leakage. The problem was that it was easy to do.

In order to eliminate this problem, the push ring is applied to the inner tube circumferential surface closer to the inner tube circumferential surface in order to increase the pressing force on the inner tube circumferential surface as the two tubes move relative to each other in the extracting direction. a wedge body forming a second cam surface having substantially the same inclination opposite to a first cam surface tilted so as to approach the first cam surface, and screwed onto the push ring at a position corresponding to the wedge body; and a tightening screw that presses the wedge against the circumferential surface of the inner tube as it is tightened, and the tightening screw is located on the upper side in the inner tube extraction direction than the first cam surface of the press ring. At the same time, as the tightening screw is tightened, the wedge body is moved in a direction in which both the cam surfaces come into close contact with each other, so that the wedge body is oriented in a direction opposite to both the cam surfaces and is closer to the peripheral surface of the inner tube as it goes in the direction of entry into the inner tube. Another third cam surface is formed on the wedge body, and the second cam surface of the wedge body presses against the tightening screw when the inner tube is extracted, and an extraction force is applied to the tightening screw. A pipe joint was developed in 1987-58467 in which the second cam surface of the wedge body and the first cam surface of the push ring were brought into direct pressure contact to avoid damage to the tightening screw.
It is proposed in the publication.

[Problem that the invention attempts to solve]

The above-mentioned conventional technology requires a wedge device consisting of a wedge body with a complicated structure having first to third cam surfaces and a tightening screw, resulting in a complex and expensive joint, and also requires pipe connection work. It was troublesome.
In addition, in places where the pipe is subject to strong vibrations in the longitudinal and crosswise directions due to earthquakes, etc., a sufficient retaining effect cannot be obtained, and the push ring is loosely fitted into the inner pipe, so the packing is pushed to one side. However, there were problems such as water leakage due to water leakage.

Therefore, an object of the present invention is to provide a joint for preventing a pipe from slipping off, which is effective in preventing pipes from being pulled out and preventing water leakage without providing a wedge device.

[Means for solving problems]

In the present invention, a plurality of packing press parts are formed integrally and spaced apart from each other on the outer circumferential surface of an inner pipe part to be inserted into the end of the outer pipe part, and an annular second part is formed from the end of the inner pipe part.
The second flange is fitted over the packing presser part through a groove formed on the inner circumferential edge of the second flange, and the protrusion on the inner circumferential edge of the second flange faces the packing presser part. By moving the second flange in the circumferential direction and tightening the second flange against the first flange at the end of the outer tube section with a tightening member to draw it toward the outer tube section, the second flange is interposed between the two tube sections. The packed packing is pressed through the packing presser section.

[Effect]

In the present invention, a first flange integral with the outer tube part and a second annular flange fitted into the inner tube part so as to engage with a packing presser part integral with the inner tube part are used as a tightening member. As a result, they are tightened together and the packing is pressed through the packing presser, so that the first and second flanges and the packing presser are fastened by the tightening member to ensure that the pipe is not pulled out. , water leakage is well prevented.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings.

In Figures 1 to 4, 1 is a bent pipe;
A fitting part 2 is formed to expand on one end side, and an outer tube part 4 is formed with a first flange 3 integrally formed at the end of this fitting part 2, and a base side of an insertion part 5 is provided on the other end side. It has an inner tube part 7 having four packing press parts 6 integrally formed at equal intervals on its outer peripheral surface. The outer tube part 4
The fitting part 2 is the fitting groove 8 of the insertion part 5 of the inner tube part 7.
and a fitting groove 10 of the packing 9 that connects with this fitting groove 8, and this fitting groove 10 has a tapered surface 1.
1 is formed. Further, as shown in FIG. 4A, the inner tube part 7 has an annular second flange 14 having grooves 12 corresponding to the respective packing press parts 6 and protrusions 13 corresponding between the grooves 12 on the inner peripheral edge thereof. and by aligning the groove 12 and the packing presser part 6, it is fitted beyond the packing presser part 6, and then as shown in FIG. 4B, turn the second flange 14 in the circumferential direction. The protrusion 13 is made to face each packing presser part 6. Further, the first flange 3 is provided with four circular holes 15 at equal intervals, and the second flange 14 is provided with four elongated holes 16 at equal intervals. The packing 9 has a ring shape, and its cross-sectional shape is the same as the fitting groove 10 and has a tapered shape that abuts the tapered surface 11. Numerals 17 and 18 are bolts and nuts that are tightening members. Then, as shown in FIGS. 4A and 4B, the annular second flange 14 is fitted from the insertion part 5 of the inner tube part 7 beyond the packing presser part 6, and rotated in the circumferential direction to each packing presser part 6. protrusion 13
In this state, packing 9 is interposed between the outer tube portions 4 of the plurality of bent tubes 1 and the inner tube portions 7 are inserted. In this case, a ring-shaped packing 9 is externally fitted onto the insertion part 5 of the inner tube part 7, and the packing presser part 6
When the insertion part 5 of the inner tube part 7 is fitted into the fitting groove 8 of the outer tube part 4 while the insertion part 5 is fixed at The tapered surface 11 of the matching groove 10 abuts against the packing presser part 6 integrally formed on the inner tube part 7. In this state, bolts 17 are inserted into the circular holes 15 and elongated holes 16 of both flanges 3 and 14 and fastened with nuts 18 to connect the first flange 3 side on the outer tube section 4 side to the second flange side on the inner tube section 7 side. By pulling the flange 14 by engaging the protrusion 13 of the second flange 14 and the packing presser part 6 integrally formed on the inner tube part 7, the tapered surface 11 on the outer tube part 4 side and the inner tube part 7 are pulled together. Press the packing 9 with the packing presser part 6 on the side.

As described above, in this embodiment, a plurality of sets of the second flange 14 engaged with the packing presser part 6 integrally formed with the inner tube part 7 and the first flange 3 integrally formed with the outer tube part 4 are provided. Now, four sets of bolts 17
Since the packing 9 is pressed between the tapered surface 11 and the packing presser part 6 by tightening the bolt 18, the bolt 17 is tightened.
Then, by tightening with the nut 18, the insertion part 5 of the inner tube part 7 is strongly drawn into the fitting part 2 of the outer tube part 4 due to the engagement between the second flange 14 and the packing presser part 6, and is strongly fastened. At the same time, by tightening both flanges 3 and 14 with four sets of bolts 17 and nuts 18, outer tube portion 4 and inner tube portion 7 are integrally connected via both flanges 3 and 14.
For this reason, the prevention of the pipe 1 from slipping out is improved compared to the conventional method that tightens a press ring that is loosely fitted into the inner pipe part.
The second flange 14, which is integrally formed with the outer tube part 4 and which engages with the packing presser part 6 which is integrally formed with the inner tube part 7, is free from the risk of coming off even if strong vibrations such as earthquakes are applied. Since it is connected to the flange 3 of 1 by multiple sets of bolts 17 and nuts 18, there is no gap between the inner pipe part 7 and the packing presser part 6, and the packing 9 presses well, so that water leakage can be effectively prevented. I can do it. Further, since there is no need to provide a wedge device consisting of a wedge body having first to third cam surfaces and a tightening screw as in the prior art, the structure is simple and the pipe connection workability is improved. Furthermore, since the second flange 14 is provided with a plurality of elongated holes 16 at equal intervals, it is easy to align the first and second flanges 3 and 14, and the bolts 17 and nuts 18 can be tightened quickly. It can be carried out.

Note that the present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the scope of the gist of the present invention. For example, the shapes of the first and second flanges or the number of circular holes, long holes, bolts, and nuts may be selected as appropriate. Further, the number of grooves and protrusions on the second flange need not be the same as those on the packing presser portion, and may be appropriately selected. Further, although the example has been explained using a curved pipe, it goes without saying that a straight pipe may also be used.

[Effect of idea]

In the present invention, a plurality of packing press parts are formed integrally and spaced apart from each other on the outer circumferential surface of an inner pipe part to be inserted into the end of the outer pipe part, and an annular second part is formed from the end of the inner pipe part.
the second flange is fitted over the packing presser part, and the second flange is moved in the circumferential direction so that the protrusion of the second flange faces the packing presser part, and the second flange By tightening the first flange at the end of the outer tube with a tightening member and pulling it toward the outer tube, the packing interposed between the two tubes is pressed via the packing presser. The inner pipe part and the outer pipe part are integrally connected via the flange and packing presser part,
It is possible to provide a joint for preventing a pipe from slipping out, which is good in preventing disconnection and water leakage.

[Brief explanation of drawings]

Fig. 1 is a partially enlarged overall longitudinal sectional view showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view taken along the line A-A in Fig. 1, and Fig. 3 is an enlarged sectional view taken along the line B-B in Fig. 1. Figure, 4th
Figures A and B are perspective views showing the assembled state of the second flange. 2... Fitting portion, 3... First flange, 4...
Outer tube part, 6... Packing presser part, 7... Inner tube part, 9... Packing, 12... Groove, 13... Projection, 14... Second flange, 17, 18... Tightening member.

Claims (1)

[Scope of utility model registration request] A first flange integrally formed at the end of the outer tube, an inner tube inserted into the end of the outer tube, and a first flange interposed between the fitting portion of the outer tube and the inner tube. a packing presser, a plurality of packing pressers formed integrally and spaced apart from each other on the outer circumferential surface of the inner tube part, grooves corresponding to the packing pressers, and protrusions corresponding between the grooves. an annular second flange that is fitted from the inner tube end beyond the packing presser part and moved in the circumferential direction so that the protrusion and the packing presser part face each other; A joint for preventing deviation of a pipe, comprising a tightening member that presses the packing via the packing presser by drawing a second flange toward the first flange.