JPS5815748Y2 - Pipe separation prevention device at pipe joints - Google Patents

Description

[Detailed Description of the Invention] The present invention mainly relates to a device for preventing separation of pipes at pipe joints in piping for transporting fluids such as water and gas.

Conventionally, this type of tube detachment prevention device has been used, for example, in
As in No. 9031, a plurality of push bolts facing the pipe socket are screwed onto the circumferential surface of a push ring bolted to the pipe socket, and the tip of each push bolt directly touches the outer circumferential surface of the pipe socket. There are devices that have a structure that presses against them, but these devices rely only on tightening the push bolt to hold the tube, so they cannot provide a strong tube holding force and cause an increase in the pressure inside the tube. However, there was a drawback that the pipe could easily come off due to movement of the buried ground.

Therefore, in the present invention, a piece is interposed between the push bolt provided on the push ring connected to the pipe socket and the insertion of the pipe, and when the pipe is extracted, the piece rotates along the spherical surface of the tip of the push bolt.
It is an object of the present invention to provide a tube detachment prevention device in which a piece bites into the tube to obtain a strong tube holding force, and in which detachment of the tube can be safely and reliably prevented by a part of the stopper.

That is, in the present invention, the tube socket is inserted into the pipe socket through the backing, and in the pipe joint part where the push ring fitted into the pipe socket and the pipe socket are connected by a coupling tool, the outer circumferential surface of the push ring is A plurality of push bolts facing the front push ring were screwed in at appropriate intervals in the circumferential direction, and the piece was housed in a piece storage space provided with a gate on the inner circumference of the push ring between the tip of each push bolt and the outer periphery of the tube insertion hole. Each piece is interposed, a hemispherical convex spherical surface with a radius smaller than the radius of the push bolt is formed at the tip of the push bolt, and a plurality of claws are provided on the lower surface of the piece to contact the front pusher 1. forms a shallow concave arc-shaped fitting surface with the same radius as the convex spherical surface in the tube axis direction cross section, and when the convex spherical surface is fitted to the corresponding bottom surface and an ejection force or push force is applied to the pipe joint part, the above-mentioned The piece is rotatable about the center of the convex spherical surface as the rotation center, and the front wall of the piece housing portion of the push ring forms part of a stopper that regulates the maximum rotation angle of the piece when the front pusher 1 is pulled out. This is a tube detachment prevention device characterized by the following features.

Next, the first embodiment of the present invention shown in FIGS. This shows a case where the fitting is applied to a so-called mechanical pipe joint in which the fitted press ring 4 and the flange 5 of the pipe socket 1 are tightened with linking bolts 6 and nuts 7, and the backing 2 is strongly pressed by the press ring 4. Projections 8 are provided at equal intervals in the circumferential direction on the front surface of the , and push bolts 9 are screwed into each projection 8 in the centripetal direction of the press ring 4, that is, toward the tube insertion port 3, and The piece 11 is accommodated in a piece accommodating accommodating portion 10 recessed on the inner periphery of the push ring 4, and a hemispherical convex spherical surface 12 having a radius smaller than the radius of the push bolt formed at the tip of the push bolt 9 is provided on the top surface of the piece 11. The claws 14, which are shallow and have the same radius as the convex spherical surface 12, are fitted into the tube socket 3 by tightening the push bolt 9, and the claws 14 arranged in parallel on the front and back of the bottom surface of the piece 11 are bitten into the tube socket 3. The front and rear walls are used as stopper parts 15 and 16 for regulating the maximum rotation angle of the piece 11, which will be described later.
A crank-shaped holding pin 18 whose ends are engaged with engagement holes 17 provided on both side walls is inserted into the bottom surface of the piece 11 between the claws 14 and 14, and the piece 11 is held in a holding manner by the holding pin 18. .

In this example, when the pipe socket 1 and the pipe inlet 3 try to be pulled out relative to each other due to an increase in the internal pressure of the pipe or earth pressure during underground use, the pipe gets stuck in the pipe inlet 3. The dowel 11 tends to move outward together with the tube insertion port 3, and the convex spherical surface 12 of the push bolt
The piece 11 to which the concave spherical surface 13 is fitted is shown on the imaginary line 1 in FIG.
As shown at 9, these convex and concave spherical surfaces 12 and 13 tend to rotate around the common spherical center, and as a result, the claw 14 at the rear of the piece 11 further bites into the tube insertion port 3, increasing the tube holding force. This increases the relative extraction of the tube inlet 3 and the tube holder 1.

At this time, if the rotation of the piece 11 reaches a predetermined value, the piece 11
is prevented from further rotation by hitting the front stopper part 15, and the tube insertion port 3 is further strongly prevented from being pulled out by the increased biting force of the claw 14 and the rotation prevention of the piece 11.

In addition, if the tube insertion port 3 and the tube socket 1 tend to be inserted relatively, the claw 14 at the front of the piece will be inserted for the same reason as above.
creates a tendency to inject into the tube insertion port 3 and increases the holding force, and the rear stopper part 16 prevents the piece 11 from rotating beyond a certain level,
Insertion between the tube insertion port 3 and the tube socket 1 is prevented.

Furthermore, in this example, even before fitting the push ring 4 into the pipe insertion port 3, the piece 11 is held in a holding manner by the holding pin 18, so the push bolts are inserted in advance before installation into the pipe insertion port 3. 9 can be assembled to the press ring 4 in advance.

Next, the second embodiment shown in FIGS. 4 and 5 will be explained. This example is applied to a ML Titon type pipe joint in which a front pusher 23 is inserted into a pipe socket 21 through a backing 22. This shows the case where the push ring 24 is loosely fitted into the front push L] 23.
Tighten the bolts 41 toward the pipe socket 21 on the rear protrusions 40 provided on the rear surface at equal intervals in the circumferential direction to connect the bolts 41 and the pipe socket.
] 21 are engaged and connected, and protrusions 28 are attached to the front surface of the press ring 24 at equal intervals in the circumferential direction, and as in the previous example, press bolts 29 are screwed into the protrusions 28 and inserted into the accommodating part 30. The convex spherical surface 32 of the push bolt 29 is fitted onto the concave spherical surface 33 of the housed piece 31, and the pawl 34 of the piece 31 is bitten into the tube insertion port 23 by tightening the push bolt 29. The rear wall is used as a stopper part 35, 36, and the piece 31 is held by a retaining pin 38 that is engaged with the engagement hole 37, and the tube insertion port 23 and the tube socket 21 are
When the two try to pull out or push in relative to each other, the piece 31 rotates as in the previous example to increase the holding force with the tube socket 23, and prevents the pipe from being pulled out between the tube socket 23 and the tube socket 21. This will prevent break-ins.

In these embodiments, the push bolt 9.29 and the piece IL3
The fitting surfaces with 1 are convex spherical surface 12.32 and concave spherical surface 13.3, respectively.
3, but both of the fitting surfaces do not need to be spherical, and the pieces may be pieces 58 with arc-shaped grooves 57, as shown in FIG.
Alternatively, a piece 62 having an arc-shaped cross section and an elliptical fitting surface 61 as shown in FIG. It is sufficient to make it the center of rotation when rotating.

Further, in the embodiment described above, a holding pin 18 is used as a piece holding means.
．． As shown in FIG. 6, the holding means includes grooves 70 and 71 provided in both lateral surfaces 66 of the piece 65 and the corresponding lateral walls 69 of the accommodating portion 68 of the press ring 67.
01J song means to interpose an elastic body 72 and hold the piece 65 in a pinching manner by the elastic body 72, or as shown in FIG.
4 in contact with the bottom 76 between the claws of the pieces 75, a plurality of pieces 75 provided in the circumferential direction of the push ring 73 are pressed against the corresponding push bolts γγ by this ring 74, and the pieces 75 are held by the ring T4, etc. can be mentioned.

Furthermore, the pieces may be pieces 81, 82, 83 having three claws 78, four claws 79, and a large number of claws 80 at the front and rear of the bottom, respectively, as shown in FIGS. 8a, b, and c. The number of claws may be determined as appropriate depending on the material of the tube inlet, and for a tube inlet made of soft material, it is desirable to increase the number of claws so that they bite into the tube inlet over a wide area.

As described above, in the present invention, the tube socket is inserted into the pipe socket through the backing, and the push ring fitted in the pipe socket is connected to the pipe socket using a coupling device. A plurality of push bolts are screwed into the outer circumferential surface at appropriate intervals in the circumferential direction toward the pipe insertion port, and the pieces are accommodated in a piece accommodation recessed in the inner circumference of the push ring between the tip of each push bolt and the outer circumference of the pipe insertion port. A hemispherical convex spherical surface with a radius smaller than the radius of the push bolt is formed at the tip of the push bolt, a plurality of pawls are provided on the bottom surface of the bridge that come into contact with the tube insertion port, and a plurality of claws are provided on the top surface of the bridge. A shallow concave arc-shaped contact liquid surface with the same radius as the convex spherical surface was formed in the cross section in the pipe axial direction, five of the convex spherical surfaces were fitted into the liquid surface, and an ejection force or pushing force was applied to the pipe joint. When the piece is rotatable about the spherical center of the convex spherical surface, a part of a stopper is provided on the front wall of the piece accommodating portion of the pushing ring for regulating the maximum rotation angle of the piece when the tube insertion port is pulled out. It is characterized by the fact that the piece is always uniformly perpendicular to the tube socket and does not bite into it, but the piece can be moved by relative extraction or relative push-in of the front push against the tube socket. By rotating around the spherical center of the convex spherical surface at the tip of the pushing pole 1, the claw of the piece bites into the tube insertion port and obtains a tube holding force according to the extraction force or pushing force, making tube removal and tube insertion effective. Furthermore, since multiple claws are provided, one of the claws bites into the tube insertion port in response to the pushing force, providing a tube holding force not only when the tube is pulled out, but also when the tube is pushed in. Since both tube detachment and tube insertion can be prevented, and the maximum rotation angle of the piece can be regulated by a portion of the stopper, tube detachment prevention +h can be performed safely and reliably.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; Fig. 1 is a partially cutaway front view of the first embodiment, Fig. 2 is a side sectional view of the same embodiment, and Fig. 3 is an enlarged view of the main parts of the same embodiment. 4 is a partially cutaway front view of the second embodiment, FIG. 5 is a side sectional view of the same example, and FIGS. 6 and 7 are side sectional views.
The figures are partial front sectional views showing different examples of holding means, Fig. 8a,
b and c are side views of another example piece, FIG. 9 is a side sectional view of another example piece, and FIGS. 10 a and b are a side sectional view and a plan view of still another example piece. 1...Pipe socket, 2...Backing, 3
...Tube insertion port, 4...Press ring, 5...
...Flame, 6...Bolt, T...Nut, 8...Protrusion, 9...Push bolt,
10...accommodation section, 11...piece, 12.
...Convex spherical surface, 13...Concave spherical surface, 14...
...Claw, 15.16...Part of stopper, 1
7... Engagement hole, 18... Holding pin, 1
9...Virtual record, 21...Pipe socket, 22
...Backing, 23...Tube insertion port, 2
4... Press ring, 25... Tsuba, 28...
...Protrusion, 29...Press 1~. 30・
...Accommodation section, 31... Piece, 32...
...Convex spherical surface, 33...Concave spherical surface, 34...
・Claw, 35.36...Part of stopper, 37...
...Engagement hole, 38...Retaining pin, 40...
... Rear protrusion, 41 ... Bolt, 57.
・・・Groove, 58... Piece, 61...
Liquid level, 62... piece, 65... piece, 6
6...Side surface, 67...Press ring, 68...
...Accommodation section, 69...Side wall, 70, 71
...Groove, 72...Elastic body, 73...
...Press ring, 74...Ring, 75...
・Block, 76...Bottom, 77...Push bolt, 78.79.80...Claw, 81,82.8
3...piece.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a pipe joint portion in which a pipe socket is inserted into a pipe socket through a backing, and a push ring fitted into the pipe socket is connected to the pipe socket with a coupling device, the push ring A plurality of push bolts facing the pipe insertion port are screwed into the outer peripheral surface of the push ring at appropriate intervals in the circumferential direction, and between each push bolt tip and the outer periphery of the pipe insertion port, a piece accommodating housing recessed in the inner circumference of the push ring is inserted. Each piece is interposed between the pieces, the tip of the push bolt has a hemispherical convex spherical surface with a radius smaller than the radius of the push bolt, and the lower surface of the piece is provided with a plurality of claws that contact the tube insertion port. forms a shallow concave arc-shaped fitting surface with the same radius as the convex spherical surface in the tube axis direction cross section, and when the convex spherical surface is fitted to the corresponding fitting surface and an extraction force or push force is applied to the pipe joint. The piece is rotatable about the spherical center of the convex spherical surface as a rotation center, and a stopper is formed on the front wall of the piece accommodating portion of the pushing ring for regulating the maximum rotation angle of the piece when the tube insertion port is pulled out. A tube detachment prevention device characterized by: 2. A utility model registration request in which a pipe socket is inserted into a pipe socket via a backing, and the push ring fitted into the pipe socket and the pipe socket are connected by a coupling, and the pipe joint presses the backing with the push ring. A tube detachment prevention device according to scope 1. 3.Practical use in which a pipe socket is inserted into a pipe socket via a backing, and the pipe joint part, which connects the press ring fitted into the pipe socket and the pipe socket with a connector, supports the backing at the pipe socket. A tube detachment prevention device according to claim 1 of the patent registration claim.