JPS6388393A - Pipe joint - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pipe joint that allows connecting pipes to be easily and quickly connected by a clockwise operation.

(Conventional technology) For example, in gas piping work, workers generally enter a hole dug in the ground and connect connecting pipes such as polyethylene pipes or steel pipes with pipe fittings, but because the excavation area is large, Excavation and other civil engineering costs are expensive, and in recent years, it has sometimes been difficult to cut across roads due to traffic conditions.

Therefore, as shown in Fig. 10, a horizontal hole 5 is penetrated from a wide vertical shaft 2 excavated at the burial site of the main pipe 1 to a narrow vertical shaft 4 excavated near a private house 3. Fitting 7
Insert the vertical pipe 8 with the attached pipe into the narrow vertical shaft 4, insert the end of a flexible connecting pipe 6 such as a polyethylene pipe drawn from the vertical shaft 2 through the horizontal hole 5 into the pipe joint 7, and In recent years, a construction method has been adopted in which the pipe wrench 9 is operated from the ground to tighten the press ring of the pipe joint 7 to make the road thicker (piping without excavation).

(Problem to be Solved by the Invention) However, according to the above-mentioned construction method, for example, a pipe wrench 9 with a long handle of about 1.5 m is operated on the ground, and
Since tightening is performed at a depth of m, not only does the tightening stroke become small, but the tightening work requires a considerable amount of time and trouble. Further, since the press ring is rotated and tightened, there is a problem in that a flexible connecting pipe such as a polyethylene pipe is considerably twisted.

(Objective of the Invention) The present invention has been made in view of the above-mentioned problems of the conventional art, and it makes it possible to instantly connect the connecting pipe to the joint body by sliding the push ring, thereby making the joining work extremely easy and quick. The purpose is to provide pipe fittings that can be used to

(Means for Solving the Problems) In order to achieve the above object, the pipe joint of the present invention includes a joint body into which the connecting pipe is inserted, and a joint body into which the connecting pipe is inserted and which is inserted into the opening of the joint body. a press ring, an engaging mechanism interposed between the joint body and the press ring, and a gasket disposed between the press ring and an inner circumferential surface of the joint body deeper than the intervening location of the engaging mechanism; The meshing mechanism includes a retaining claw-shaped female screw provided on the joint body side, and a male screw provided on the press ring side and capable of engaging with the female thread in a ratchet state, and either the female thread or the male thread is The joint body is configured to be able to expand and contract in diameter, and is always elastically biased in the direction of meshing with the other, and the joint body has a groove on the inner circumferential surface that gradually increases in diameter toward the open end side. 1 tapered surface is formed.

(Function) In the pipe joint of the present invention, when the connecting pipe is inserted into the joint body through the push ring and then the push ring is pushed into the joint body, the gasket is pressed against the first tapered surface of the joint body by the push ring. A seal is created between the joint body and the connecting pipe. Further, by pushing the push ring, the male thread provided on the push ring side moves straight over the female thread provided on the joint body side, and both screws are screwed together in a ratchet state.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a partial sectional view showing a state in which a connecting pipe is connected to a pipe joint of an embodiment, and FIG. 2 is a sectional view of a main part showing a state before connection. As shown in these figures, the elbow-type joint body 1
The tip of 0 is widened to a large diameter, and a retaining claw-shaped female screw 12 is formed on the inner circumferential surface of the tip, and a female thread 12 with a pawl shape is formed on the inner circumferential surface of the female screw 12. 1 tapered surface 13 is formed. On the other hand, there is a second tapered surface 1 on the inner peripheral surface of the tip end of the push ring 14, which gradually becomes larger in diameter toward the tip side.
5 is formed, and a retainer 'a16 is recessed in the outer circumferential surface of the distal end thereof. A plurality of arc-shaped connection pieces 18 each having a male thread 17 are held in this holding groove 16 . The female screw 17 has a pawl shape that can be screwed into the female screw 12 in a ratcheted manner. The connecting piece 18 is movable in the radial direction but not movable in the circumferential direction due to the convex-concave engagement with the press ring 14, and is made of rubber as shown or a coil (not shown) interposed between the holding groove 16 and the connecting piece 18. It is constantly biased in the direction of engagement with the female screw 12 by an elastic member 19 made of a spring. The connecting piece 18 may be in the shape of an occluded ring, and in that case, as shown in FIG. By inserting the connecting piece 18 more closely and interposing it in the missing circular portion 57 of the connecting piece 18, the connecting piece 18 may be able to expand and contract in the radial direction with respect to the press ring 14, but can be made immovable in the circumferential direction.

If this is done, the elasticity of the material of the connecting piece 18 itself will bias the female thread 12 in the direction of meshing with its mating male thread. In addition, in FIGS. 7 and 8,
Although the example in which the connecting piece 18 is provided with the male thread 17 has been described,
When holding a missing ring-shaped connection piece on the press ring side,
It is necessary to provide the connecting piece with an internal thread. Further, the connecting piece 18 may be formed by connecting a plurality of arcuate members 63 using a plurality of springs 62, as illustrated in FIG.

Next, between the first tapered surface 13 and the second tapered surface 15, a gasket 20, a retainer 21, and a plurality of spheres 2 are provided.
2 are held at predetermined intervals by a retaining band 23, and the retaining members 26 are arranged in order from the first tapered surface 13 side. Resin lining layers 24 and 25 are formed on the outer surfaces of the joint body 10 and the press ring 14, respectively, and an O-ring 27 is fitted into a circumferential groove formed on the outer peripheral surface of the lining layer 25 of the press ring 14. At the same time, a T-shaped ring 2 is placed in an annular recess formed on the inner peripheral surface of the other end of the press ring 14.
9 is fitted. In addition, a plurality of stoppers 30 are provided at appropriate positions on the inner circumference of the joint body 10, while the connecting pipe 6
A reinforcing stiffener 31 is fitted to the end of the shaft.

Next, the effect will be explained.

As shown in FIG. 2, the male thread 17 of the connecting piece 18 is screwed into the female thread 12 of the joint body 10 by about two threads, and the connecting pipe 6 is inserted into the press ring 14 and the joint body 10 as shown by the arrows, and as shown in FIG. The tip is brought into contact with the stopper 30 as shown in FIG. Next, when the press ring 14 is pushed into the joint main body 10 as shown by the arrow in FIG. 1, the male thread 17 of the connecting piece 18 moves straight over the female screw thread 2 of the joint main body 10. As a result, the gasket 20 pushed down by the pusher 4 via the retainer 21 comes into contact with the first tapered surface 13 and is compressed, and is brought into pressure contact with the outer circumferential surface of the connecting pipe 6. Further, the sphere 22 of the retaining member 26 whose movement is prevented by the retainer 21 is pressed against the outer surface of the connecting tube 6 by the second tapered surface 15, and the wedge action of this sphere 22 prevents the connecting tube 6 from being pulled out. .

On the other hand, since the male screw 17 is screwed into the female screw 12 in a ratchet state by the bias of the elastic member 19, the press ring 14
does not return in the opposite direction of movement.

In summary, when connecting the connecting pipe 6 to a pipe joint,
After inserting the connecting pipe 6 into the push ring I4 and the joint body 10, the connection is completed by simply pushing the push ring 14 into the joint body 10.

When it is desired to remove the connecting pipe 6, the push ring 14 is rotated.

As a result, the connecting piece 18 rotates together with the press ring 14, the male thread 17 of the connecting piece 18 is unscrewed from the female thread 12 of the joint body 10, and the retaining member 26 is accordingly loosened. Therefore, the connecting pipe 6 can be easily pulled out from the pipe joint.

Next, an example of a device for pushing the press ring 14 into the joint body 10 will be described with reference to FIGS. 3 to 5.

This pushing device includes a holding member 33 which has a double-folding configuration with a rotating portion 34 configured by a hinge or a hinge;
The retaining bottle 35, the hydraulic cylinder 37, 37 attached to the holding member 33, and the piston rod 3 of the hydraulic cylinder 37
8 and a retaining ring 40 attached to it. In order to perform the connection work described above with this pushing device, by inserting the fastening pin 35 into the holding member 33 holding the joint body 10, the holding member 33 is fixed to the joint body 10, and
The retaining ring 40 is wrapped around the other end of the press ring 14 and fixed with a retaining pin 41. Thereafter, when the hydraulic cylinder 37 is driven by an operation on the ground, the retaining ring 40 is retracted by the piston rod 38, and the push ring 14 is pushed into the joint body 10. After completing the work, pull up the drawstring (not shown) to pull out the native bottle 35 and the stopper bottle 41, open the holding member 33 with the two operation rods 43, 43 provided upright on the holding member 34, and remove the joint body 10. At the same time, the retaining ring 40 is opened to release the fixation with the push ring 14, and these are pulled up to the ground.

In the embodiment described above, the female thread 12 provided on the joint body 10 side, the male thread 17 of the connecting piece 18, and the elastic member 19 that constantly presses the male thread 17 in the direction of engagement with the male thread 12. They work together to constitute a meshing mechanism, which is an example of the constituent elements of the present invention. In this meshing mechanism, the male thread 17 is connected to the push ring 1 from where the connecting piece 18 is held in the holding groove 16 of the push ring 14.
Equipped on 4 sides.

FIG. 9 illustrates the usage state of a modified pipe joint equipped with a fitting mechanism. In the same figure, a circumferential groove 11 is recessed in the inner circumferential surface of the end opening of the joint body 10 which has been enlarged to a large diameter, and a female thread 12 having a pawl shape is screwed into the joint body 10. The piece 50 is fitted into the circumferential groove 11 via the elastic member 19.

Furthermore, a first tapered surface I3 whose diameter gradually increases toward the open end is formed on the inner circumferential surface of the joint body 10 at a position deeper than the connection piece 50 position.

The connecting piece 50 is composed of a plurality of two or three split rings, and a recess 52 is provided on the side surface of each split ring. The protruding piece 54 of the nut 53 is fitted and held so as not to fall off from the circumferential groove 11, and
It is movable in the diametrical direction, but not movable in the circumferential direction.

Further, the elastic member 19 is made of an annular coil spring or an annular rubber (not shown), and is interposed in the engagement groove 50a on the outer periphery of the connection piece 50, so as to constantly urge the connection piece 50 inward. . On the other hand, a male thread 17 that can be screwed into the female thread 12 of the connection piece 50 in a ratchet state is screwed onto the outer circumferential surface of the push ring 14 at one open end side. Further, a second tapered surface 15 is formed on the inner periphery of one open end of the push ring 14 and has a diameter that gradually increases toward the one open end. Since the other configurations are the same as those in FIG. 1, the same or corresponding parts will be designated by the same reference numerals and the explanation will be omitted.

According to the pipe joint shown in FIG. 9, the connecting pipe 6 is inserted from the other end opening of the press ring 14 as shown by the arrow in the figure, and is inserted until the tip abuts the stopper 32, and the press ring 14 is inserted into the joint main body 10.
When the push ring 14 moves straight, the gasket 20
is pushed into the first tapered surface 13 by the retainer 21
Pressed by

Further, the retaining ring 55 slides on the second tapered surface 15 to reduce its diameter, and the retaining teeth 56 bite into the outer surface of the connecting tube 6 to prevent the connecting tube 6 from being withdrawn.

Furthermore, since the connecting piece 50 is urged inward by the elastic member 19, both screws 12, 17 are screwed together in a ratcheted state. Therefore, the connecting pipe 6 is fixed to the joint body 10 without being pulled out, and the gasket 27
0 and the connecting pipe 6 are reliably sealed. In addition, in order to push the push ring 14 into the joint main body 10, the pushing device explained in FIGS. 3-5 can be used similarly.

When removing the connecting pipe 6, rotate the press ring 14 relative to the joint body 10 to unscrew the screw, and then attach the press ring 14 to the joint body 1.
All you have to do is deviate from 0. At this time, the inner nut 5
3 is integrated with the joint body 10 through the resin lining N25, so the joint body 10 and the inner nut 53 do not rotate together.

In this embodiment, the female thread 12 of the connecting piece 50 works together with the male thread 17 provided on the side of the press ring 14 and the elastic member 19 that constantly presses the female thread 12 in the direction of engagement with the male thread 17. It constitutes a meshing mechanism which is a component of the present invention. In this meshing mechanism, since the connecting piece 50 is held by the joint body 10, the female thread 12 is provided on the joint body 10 side.

It goes without saying that the present invention is not limited to the above-mentioned embodiments, and the joint main body may be of a socket type, 9-shaped shape, etc., and all the connecting pipes inserted into the respective openings of the joint main body may be formed as described above. It may be possible to connect only by moving the push ring, or it may be possible to connect only some connecting pipes by moving the push ring, and the connection pipes may be steel pipes, resin-lined steel pipes, cast iron pipes, etc. Furthermore, the construction method using the pipe joint of the present invention is not limited to the case where the pipe joint of the present invention is used in a shaft, but also the case where the pipe joint and the connecting pipe are connected above ground, or when the pipe joint and the connecting pipe are connected underground by excavating the ground. It may be used when connecting, for example, and various changes can be made without departing from the gist of the present invention.

(Effects of the Invention) As detailed above, according to the pipe joint of the present invention, the pipe joint and the connecting pipe can be connected extremely quickly by pressing and moving the pushing ring after inserting the connecting pipe. In addition, the connection can be easily made, and since the pushing ring is simply moved in a straight line, no twisting occurs in the connecting pipe. Furthermore, the present invention can be applied to connect underground pipes such as gas pipes by operating above ground, or to connect flexible pipes such as polyethylene pipes, to achieve remarkable effects. It is.

[Brief explanation of the drawing]

Figures 1 and 2 show how a pipe joint according to an embodiment of the present invention is used, with Figure 1 being a longitudinal cross-sectional view showing the state after connection, and Figure 2 being a longitudinal cross-section of main parts showing the state before connection. 3 is a plan view of the pushing ring pushing device attached to the pipe joint, FIG. 4 is a side view of the same, FIG. 5 is a front view showing a part of the device, and FIG. 6 is a view of the connecting piece. A front view showing a modified example, FIGS. 7 and 8 are partial sectional views showing the main parts of a pipe joint using another modified example of the connecting piece, and FIG. 9 is a usage state of a pipe joint according to another embodiment. FIG. 10 is an explanatory diagram of a conventional piping method for gas piping. 6... Connection pipe, 10... Joint body, 12... Female thread, 13... First tapered surface, 14... Push ring, 17
...Male thread, 19...Elastic member, 20...Gasket.

Claims (1)

[Claims] (1) A joint body into which the connecting pipe is inserted, a press ring into which the connecting pipe is inserted and which is inserted into the opening of the joint body, a meshing mechanism interposed between the joint body and the press ring, and the joint body. A gasket is provided between the inner circumferential surface of the inner circumferential surface deeper than the intervention point of the engagement mechanism and the press ring. and a male screw that can be screwed together with the female screw in a ratchet state, and either the female screw or the male screw is configured to be able to expand and contract in diameter, and is always elastically biased in the direction of engagement with the other. The pipe joint is characterized in that the joint main body has a first tapered surface formed on the inner circumferential surface thereof, the diameter of which gradually increases toward the open end side.