JPS6388392A - 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 connected easily and quickly with simple operations.

(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. 1O, 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 piping is installed without making a large excavation in the road by operating a vibrator wrench 9 from the ground to tighten the press ring of the pipe joint 7.

(Problems to be Solved by the Invention) However, according to the above-mentioned construction method, for example, when the pipe wrench 9 with a long handle of about 1.5 m is operated on the ground,
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 externally fitted into the opening of the joint body. a press ring, a meshing 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 meshing mechanism, The meshing mechanism includes a pawl-shaped male screw provided on the side of the joint body, and a female thread provided on the press ring side and capable of engaging with the male thread in a ratchet state, and either the male thread or the female thread. is configured to be able to expand and contract in diameter, and is always elastically biased in the direction of engagement with the other, and the joint body has a diameter that gradually increases toward the opening end on the inner circumferential surface of the joint body. It is characterized in that a first 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 female thread provided on the push ring side moves straight over the male 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 according to an embodiment, and FIG. 2 is a sectional view of a main part showing a state before connection.

In these figures, a circumferential groove 11 is recessed in the tip of an elbow-shaped joint body IO, and a connecting piece 18 having a male screw 12 with a pawl-like thread shape is attached to an elastic member 19 in the circumferential groove 11.
is held through.

Furthermore, a first tapered surface 13 is formed on the inner circumferential surface of the end portion of the joint body 10, and the diameter thereof gradually increases toward the distal end side.

The connecting piece 18 is composed of a plurality of two or three split rings. Each connecting piece 18 is movable in the radial direction due to the convex-concave engagement with the joint main body 10, but is immovable in the circumferential direction, and is always kept outward by an elastic member 19 made of rubber or a coil spring (not shown). is energized by

On the other hand, the inner circumferential surface of the press ring 14 is provided with a female thread 17 that is threadedly engaged with the male thread 12 of the joint body 10 in a ratchet state. Further, a second tapered surface 15 whose diameter gradually increases toward the open end is formed on the inner peripheral surface of the push ring 14 at a position deeper than the female thread 17. Further, between the first tapered surface 13 and the second tapered surface 15, a gasket 20, a retainer 2.1, and an annular retaining ring 23 having retaining teeth 22 formed on the inner circumferential surface are provided, respectively. They are arranged in order from the tapered surface 13 of No. 1. A resin lining layer 24.2 is provided on each outer surface of the joint body 10 and the push ring 14, respectively.
5 is coated, and an O-ring 27 is fitted in a circumferential groove formed on the outer circumferential surface of the tip of the lining layer 24 of the joint body 10, and an O-ring 27 is formed on the inner circumferential surface of the other end of the press ring 14. A T-shaped rubber ring 29 is fitted into the annular recess 28 .

In addition, a plurality of stoppers 30 are provided at appropriate locations on the inner circumference of the joint body 10.
On the other hand, a reinforcing stiffener 31 is fitted to the end of the connecting pipe 6.

The connecting piece 18 may be in the shape of a circular ring, in which case a pin 59 or a screw 61 is inserted from the outside into the through hole 58 formed in the press ring 14, as shown in FIG. 7 or 8. By interposing the connecting piece 18 in the omitted circular portion 57 of the connecting piece 18, the connecting piece 18 can be expanded and contracted in the radial direction with respect to the press ring 14, and can be made immovable in the circumferential direction. By doing this, the elasticity of the material of the connection piece 18 itself allows the female thread 1 to tighten.
7 is biased in the direction of meshing with its mating male screw. In addition, in FIG. 7 and FIG. 8, an example was explained in which the connecting piece 18 was provided with the female thread 17, but when the connecting piece in the shape of a circular ring is held on the joint body side, the connecting piece is provided with the male thread. It is necessary to have the following. Further, the connecting piece 18 may be one in which a plurality of arcuate members 63 are connected by a plurality of springs 62, as illustrated in FIG.

Next, the effect will be explained.

As shown in FIG. 2, a push ring 14 is attached to the male thread 12 of the connecting piece 18
The connecting tube 6 is inserted into the press ring 14 and the joint body 10 as shown by the arrow, and its tip is brought into contact with the stopper 30 as shown in FIG. Next, press ring 1
4 is pushed into the joint body 10 as shown by the arrow in FIG. 1, the female thread 17 of the push ring 14 passes over the male thread 12 of the connecting piece 18 and moves straight. As a result, the gasket 20 pushed through the retainer 21 by the press ring 14 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 retaining ring 23 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 its retaining teeth 22 sink into the connecting tube 6. On the other hand, the male thread 12 is connected to the elastic member 1
Since the press ring 14 is screwed into the female thread 17 in a ratchet state by the biasing force 9, the push 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 press ring 14 and the joint body 10, the connection is completed by simply pushing the press 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 12 of the connecting piece 18 is unscrewed from the female thread 17 of the joint body 10, and the retaining ring 23 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 pin 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 pull cord (not shown) to pull out the native pin 35 and retaining pin 41, open the holding member 33 with the two operation rods 43, 43 provided upright on the holding member 34, and connect 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 screw 17 provided on the press ring 14 side, the male screw 12 of the connecting piece 18, and the elastic member 19 that constantly presses the male screw 12 in the direction of engagement with the male screw 17. 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 12 is provided on the side of the joint body 10 from where the connecting piece 18 is held in the holding groove 16 of the joint body 10.

FIG. 9 illustrates the state in which a pipe joint equipped with a modified meshing mechanism is used. In the same figure, a circumferential groove 60 is recessed in the inner circumferential surface of the end opening of the press ring 14, which has been enlarged to a large diameter, and a connecting piece has a female thread 17 having a locking pawl shape threaded thereon. 50 is fitted into the circumference 'a60 via an elastic member 19. In addition, on the inner peripheral surface of the deep part of the joint body 10,
A first tapered surface 13 that gradually becomes larger in diameter toward the open end side.
is formed.

The connecting piece 50 is composed of a plurality of two or three split rings, and is held by an inner nut 53 screwed into the press ring 14 so as not to fall off the circumference a60, and is also moved in the direction of diameter expansion. possible and circumferentially immovable.

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 12 that can be screwed into the female thread 17 of the connection piece 50 in a ratchet state is screwed onto the outer circumferential surface of the joint body 10 at one open end side. 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 push ring 14 as shown by the arrow in the figure, and is inserted until the tip abuts the stopper 30, and the push 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 23 slides on the second tapered surface 15 and is reduced in diameter, and the retaining teeth 22 bite into the outer surface of the connecting tube 6 to prevent the connecting tube 6 from coming off. Furthermore, elastic member 19
Since the connecting piece 50 is biased inwardly by the screws 12 and 17, both screws 12 and 17 are screwed together in a ratcheting manner. Therefore,
The connecting pipe 6 is fixed to the joint body 10 without coming off,
The gasket 27 reliably seals between the joint body 10 and the connecting pipe 6. In addition, in order to push the push ring 14 into the joint body work 0, the pushing device explained in FIGS. 3 to 5 can be similarly used.

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.

In this embodiment, the female thread 17 of the connecting piece 50 works together with the male thread 12 provided on the side of the joint body 10 and the elastic member 19 that constantly presses the female thread 17 in the direction of engagement with the male thread 12. This 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 push ring 14, the female thread 17 is provided on the push ring 14 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, two-ring 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. Moreover, the construction method using the pipe fitting of the present invention is not limited to the case in which the pipe fitting of the present invention is used in a shaft, but also when connecting a pipe fitting and a connecting pipe above ground, or when connecting a pipe fitting and a connecting pipe underground by excavating the ground. It may be used for connecting pipes, etc., 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... Male thread, 13... First tapered surface, 14... Push ring, 17
... female 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 fitted externally into the opening of the joint body, a meshing mechanism interposed between the joint body and the press ring, and a joint body. A gasket is provided between the inner circumferential surface of the main body at a deeper part than the intervening part of the engagement mechanism and the press ring. and a female thread that can be screwed together with the male thread in a ratchet state, and either the male thread or the female thread 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.