JPH0353111Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is used for joints consisting of sockets and insertion parts of fluid pipes such as water pipes, gas pipes, and plant piping. The present invention relates to a device for preventing detachment, and more particularly, to a detachment preventing device that uses a locking piece of a long body interposed therein and using the locking piece biting into the surface of the receptacle.

[Conventional technology]

The present applicant previously proposed in Utility Application No. 143885/1985 (hereinafter referred to as "prior art") that "a fluid pipe connected within the socket at the end of one fluid pipe to be connected At the joint part of the fluid pipe into which the end insertion part is inserted and connected watertightly through the packing, the plurality of detachment prevention split fittings are engaged with the flange part of the socket part in each split part. and a fastener for tightening the flanges stretched at the ends of the split body, and an inner circumferential groove is formed in the inner surface of the split body in the circumferential direction opposite to the insertion port. An arc-shaped locking member having a disc spring action and having a biting edge formed on the inner surface is housed in the inner circumferential groove in an inclined state, and when the tightening tool is tightened, the locking member is disengaged. The prevention splitting fitting is reduced in diameter, and the locking member is pressed and restrained from the outside by the inner circumferential groove, and the biting blade of the locking member is locked to the outer peripheral surface of the insertion portion. We proposed a device to prevent separation of fluid pipes.

According to this prior art device, when the socket part receives a force in the direction of detachment from the socket part, the front and rear surfaces of the locking member are restrained by the inner circumferential groove, and the outer surfaces are restrained by the ceiling surface of the inner circumferential groove, respectively. Since it is restrained, it undergoes torsional deformation due to the action of the disc spring, and its biting blade bites deeper and evenly into the surface of the socket, reliably preventing the socket from coming off. In addition, the locking member exhibits disc spring characteristics and has flexibility to absorb vibrations caused by pulsating fluid flow or the like. Furthermore, by using a plurality of breakaway prevention metal fittings, the tightening operation of the locking member can be performed quickly and easily.

However, in the prior art, the locking member is attached by interposing elastic members made of rubber or the like arranged at both ends of the inner circumferential groove.
In addition to requiring time and effort to attach, the locking member is relatively heavy, so it cannot necessarily be said that it is completely resistant to falling off during transportation.

[Technical issues of the present invention]

The present invention has been developed in view of the above circumstances, and utilizes the disengagement preventing action of the locking member due to the action of the disc spring in the prior art disengagement prevention device and the constricting action of the disengagement prevention metal fittings with multiple splits. The purpose (technical problem) is to facilitate the mounting of the stopper member and ensure reliable holding power.

[Structure of the present invention]

In order to achieve the above object, the fluid pipe detachment prevention device of the present invention adopts the following configuration (technical means).
That is, the fluid pipes are connected watertightly through packing 3 by inserting the socket 2 at the end of the other fluid pipe to be connected into the socket 1 at the end of one of the fluid pipes to be connected. At the joint part, the plurality of detachment prevention split fittings 5 are
A, 5B have an eaves part 8 that engages with the flange part 1a of the socket part 1, and a tightening tool 7 that tightens the flanges 6 stretched on the ends of the split bodies 5A, 5B, An inner circumferential groove 10 is formed in the inner surface of the bodies 5A, 5B in the circumferential direction so as to face the insertion opening 2, and a recess 11 is formed in the front and rear walls of the intermediate portion of the inner circumferential groove 10 to face each other. In the inner circumferential groove 10, there is an arc-shaped locking piece 1 having a biting edge 13b formed on the inner surface.
3 is accommodated, and a notch 14 is formed on the inner surface of the intermediate portion of the locking piece 13 at a position corresponding to the recess 11 of the inner circumferential groove 10. Both ends of the piece 16 have an inner circumferential groove 10
When the fastener 7 is tightened, the detachment prevention split fitting 5 is reduced in diameter to form the inner circumferential groove 10.
It is characterized in that the locking piece 13 is pressed and restrained from the outside and is locked to the outer circumferential surface of the insertion port 2 by the biting blade 13b of the locking piece 13.

In the above configuration, since the present invention is suitable for application to small diameter pipes, the split fittings are not divided into four or more parts, and usually two split fittings are used.

[Effect]

The locking piece is supported by the elastic support piece in the recess of the inner circumferential groove, and will not fall off during transportation.

When this detachment prevention device is attached to a joint, when the fastener is tightened, the ceiling surface of the inner circumferential groove and the outer surface of the locking piece come into contact, causing the biting blade of the locking piece to touch the outer circumferential surface of the socket. It's going to bite.

In addition, when the insertion part receives a force in the direction of detachment from the socket, the locking piece is restrained by the inner circumferential groove on its front and rear surfaces as well as its outer surface, so it twists and deforms due to the action of the disc spring, causing the tip of the locking piece to twist and deform. The biting blade bites evenly and deeply into the surface of the socket to reliably prevent the socket from coming off.

[Effects of this invention]

Since the present invention has the above configuration, it has the following unique effects.

It is easy to attach the locking piece to the inner circumferential groove using the elastic support piece, and once it is installed, the elastic support piece does not come out due to the recess, so that the locking piece does not fall off on the other side. Does not occur.

In addition to the above, the elastic support piece can support the heavy locking piece well.

In the device of the present invention, the initial biting of the locking piece is done by tightening the fastener of the split metal fitting, so the biting operation can be performed quickly and easily. In particular, when it comes to underground pipes, it is difficult to tighten the locking pieces with push bolts from the bottom, but with the device of this invention, tightening the fasteners on the sides is sufficient and operation is easy. It is.

Since the locking piece of the present invention is evenly pressed against the ceiling surface of the inner circumferential groove of the split fitting, there is no stress concentration, and the biting blade can bite into the surface of the insertion part evenly.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the fluid pipe detachment prevention device of the present invention will be described based on the drawings.

1 to 3 show an embodiment in which the present invention is applied to a so-called socket type joint (also referred to as a slip-on type).

Reference numerals 1 and 2 are sockets and inlets for the connecting tubes H and I. The socket part 1 has a flange 1a at its outer end.
and has a packing accommodation recess 1b on its inner peripheral surface.
is formed. 2a is a chamfered end surface portion of the insertion port 2.

3 is a packing inserted into the packing accommodation recess 1b of the socket 1. The packing 3 has a self-sealing effect.

Reference numeral 5 denotes a detachment prevention split fitting fitted into the insertion opening 2, and in this embodiment, it is formed into two split parts 5A and 5B. A flange 6 is formed at both ends of each of the two halves 5A, 5B, and a bolt insertion hole 6a is formed in the flange 6, and a tightening bolt 7 (as a tightening tool) is inserted into the bolt insertion hole 6a. The split fitting 5 is assembled integrally by inserting a bolt (consisting of a bolt rod 7a and a nut 7b).

An eaves portion 8 is integrally formed to protrude from the front surface of the split fitting 5, and its bent portion 8a is connected to the flange 1 of the socket portion 1.
a to fix the split fitting 5.

Reference numeral 10 denotes an inner peripheral groove formed in the inner periphery of the main body of the split fitting 5, in which a locking piece 13 to be described later is accommodated.

The ceiling surface 10a of the inner circumferential groove 10 is formed parallel to the axis in the axial direction, and has a required curvature r (usually equicircular around the axis) in the circumferential direction.

The front and rear walls 10 at the center of the inner circumferential groove 10
Recesses 11 are provided in b and 10c to face each other.

Reference numeral 13 denotes an arcuate locking piece, which is accommodated in the inner circumferential groove 10 of the split fitting 5. The locking piece 13 is made of metal such as ductile cast iron or steel, which is commonly used in the technical field, but other materials (hard synthetic resin, such as engineering plastics such as polyacetal, polycarbonate, etc.) may be used. ) does not preclude the use of

The locking piece 13 has a substantially disk spring-like cross section;
It has highly elastic properties overall. In terms of cross-sectional shape, the outer surface 13a is flat, the inner surface 13b is formed into a biting edge, and the front surface 13c and rear surface 13d are each formed in parallel.

A notch 14 is provided in the center of the inner surface of the locking piece 13, and an elastic support piece 16, which will be described later, is attached across the notch 14.

In the planar shape, the outer surface 13a of the locking piece 13
The curvature s is slightly larger than the curvature γ of the ceiling surface 10a of the circumferential groove 10 described above. This results in
The locking pieces 13 are connected to the inner circumferential groove 10 at both shoulders of the outer surface 13a.
come into contact with.

Further, the curvature t of the inner surface 13b matches the curvature of the insertion port 2.

Reference numeral 16 denotes an elastic support piece, which is made of a thin metal plate or synthetic resin plate.

The elastic support piece 16 passes through the notch 14 of the locking piece 13 described above, and the bent portions at both ends thereof are inserted into the inner circumferential groove 1.
It is accommodated in the recess 11 of 0. As a result, the elastic support piece 16 is supported by the jaw portion 11a of the recess 11, and the locking piece 13 is installed in the inner circumferential groove 10.

Therefore, the locking piece 13 is housed and held in the inner circumferential groove 10 with the elastic support piece 16 at the factory (manufacturing site) prior to joining the pipes, thereby preventing it from falling off during transportation. do not have.

The operation for attaching the locking piece 13 to the inner circumferential groove 10 is as follows.

The locking piece 13 is fully inserted into the inner circumferential groove 10 (that is, the outer surface 13a of the locking piece 13 is brought into contact with the ceiling surface 10a of the inner circumferential groove 10), and then the elastic support piece 16 is rotated to a predetermined curvature. Then, it is forcibly bent and inserted through the opening of the recess 11 of the inner circumferential groove 10.
When both ends of the elastic support piece 16 are inserted into the recess 11, the support piece 16 immediately returns to its original shape due to the elastic force and does not come out of the recess 11.

The procedure for attaching the detachment prevention device of this embodiment and the effect upon detachment are as follows.

(1) Attach the packing 3 to the socket 1 of the fluid pipe H, and insert the socket 2 of the other fluid pipe I while maintaining centering.

(2) Engage the bent portions 8a of the eaves portions 8 of the two halves 5A and 5B of the detachment prevention split fittings 5 incorporating the locking pieces 13 with the flange 1a of the socket portion 1, and 6. Place the split fittings 5 facing each other and gradually tighten the split fittings 5 with the tightening bolts 7 to reduce the diameter of the split fittings 5. As a result, the locking piece 13 is pressed by the ceiling surface 10a of the inner circumferential groove 10, and the biting blade 13b at the tip of the locking piece 13 bites into the outer surface of the insertion port 2.

At this time, since the outer surface 13a of the locking piece 13 is in contact with the ceiling surface 10a of the inner circumferential groove 10 at both shoulders, the force applied from the split metal fitting 5 is received by these shoulders, and the inner surface of the locking piece 13 The concentrated stress on the central notch 14 of 13b is evenly distributed to the biting blade 13b.

(3) When the fluid pipes H and I move relative to each other and the insertion part 2 is displaced in the direction away from the socket part 1, the locking piece 13 closes on its outer surface 13a and front and rear surfaces 13c and 1.
3d is restrained by the inner circumferential groove 10, so it exerts a disc spring action and rotates in the torsional direction, and the biting blade 13b at the tip rotates evenly in the circumferential direction at the same position on the surface of the insertion part 2. , and it will bite even deeper. However, the insertion part 2
will definitely be prevented from leaving.

Since the biting edge 13b of the locking piece 13 bites evenly around the outer periphery of the insertion port 2, even a slight biting can exert a large blocking force.
Moreover, since there is no stress concentration, the insertion port 2 will not be depressed.

The present invention is not limited to the above-mentioned embodiments, and various design changes can be made within the scope of the basic technical idea of the present invention. That is, the following aspects are included within the technical scope of the present invention.

The tightening tool is not limited to the tightening bolt, but may be other suitable means (for example, a clamp interposed between the flanges 6, etc.).

The split fitting and the socket are engaged not only by a bent part provided on the eave, but also by engaging the tip of a locking bolt screwed into the eave in the pipe diameter direction with the collar of the socket. It can be something.

[Brief explanation of the drawing]

The drawings show an embodiment of the fluid pipe detachment prevention device of the present invention, and FIG. 1 is a longitudinal cross-sectional view of one embodiment (the second
2 is a partially sectional front view thereof, FIG. 3 is a partially sectional view taken in the Y direction of FIG. 2, and FIG. 4 a is an embodiment of the locking piece. Side view of Figure b
is a sectional view taken along the Z-Z line of a. 1...Socket part, 2...Socket part, 3...Packing, 5...Separation prevention split fitting, 5A, 5B...Split body, 6...Flange, 7...Tightening tool, 8...
Eave part, 10... Inner circumferential groove, 11... Recessed part, 13...
Locking piece, 14... Notch, 16... Elastic support piece.

Claims (1)

[Claims for Utility Model Registration] The socket 2 at the end of the other fluid pipe to be connected is inserted into the socket 1 at the end of one of the fluid pipes to be connected, and is sealed watertight through packing 3. At the joint portion of the fluid pipe connected to the fluid pipe, the plurality of detachment prevention split fittings 5 include an eaves portion 8 that engages with the flange portion 1a of the socket portion 1 on each of the split bodies 5A and 5B; Flanges 6 stretched over the ends of 5A and 5B 7 fasteners 7 for tightening each other
and the insertion port 2 is provided on the inner surface of the split bodies 5A, 5B.
A circumferential groove 10 is formed in the inner circumferential direction opposite to the inner circumferential groove, and a recess 11 is formed in the front and rear walls of the intermediate portion of the inner circumferential groove 10 to face each other. biting blade 13b
An arc-shaped locking piece 13 is accommodated therein, and a notch 14 is formed on the inner surface of the intermediate portion of the locking piece 13 at a position corresponding to the recess 11 of the inner circumferential groove 10.
are formed, both ends of the elastic support piece 16 spanning the notch 14 of the locking piece 13 are extended into the recess 11 of the inner circumferential groove 10, and when the fastener 7 is tightened, the detachment prevention split metal fitting is tightened. 5 is reduced in diameter and the locking piece 13 is pressed and restrained from the outside by the inner circumferential groove 10, thereby forming the locking piece 13.
A device for preventing detachment of a fluid tube, characterized in that the device is configured to lock onto the outer circumferential surface of the insertion port 2 by a biting blade 13b.