JPH07332556A - Separation preventing pipe joint - Google Patents

Abstract

PURPOSE:To prevent a pipe joint from being bent by a simple constitution. CONSTITUTION:A liner 11, which restricts moving a spigot 7 to a deep side of a socket 1 further from a position where the spigot can be engaged with a lock ring 5, is arranged in the inside of the socket 1. A flection-preventing protruded part 15, with which a clearance between a peripheral surface of this spigot 7 and an internal peripheral surface of an opening part 13 of this socket 1 is filled, preventing flection between the spigot 7 and the socket 1, is formed in the periphery of the spigot 7. A protrusion 17, opposed each other to an end face 20 of the socket, is formed in an external surface of the spigot 7. A bolt 19 is screwed out from the protrusion 17, to press the end face 20 of the socket, and by drawing out the spigot 7 from the socket 1 by a suitable amount, excessively advancing the flection-preventing protruded part 15 into the socket 1 is corrected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a separation prevention pipe joint.

[0002]

2. Description of the Related Art As one type of pipe joint, there is a slip-on type pipe joint. This slip-on type pipe joint is capable of joining the receiving port and the receiving port by mounting a sealing material inside the receiving port and inserting the insertion port into the receiving port while compressing the sealing material. A sealing material is used to ensure the sealing performance between the mouth and mouth.

Further, as a slip-on type pipe joint provided with a separation preventing function, a lock ring is attached to a lock ring accommodating groove formed on the inner circumference of the receiving port and inserted into this receiving port. It is known that a protrusion is provided on the outer periphery of the tip of the insertion opening to prevent the insertion opening from being removed from the receiving opening by engaging with the lock ring. With the separation prevention pipe joint having such a configuration, when the insertion port is inserted into the receiving port, the diameter of the lock ring is temporarily increased by using the inclined surface formed at the tip of the protrusion of the insertion port as a guide. The protrusion can pass through the inside of the lock ring toward the rear side of the receiving port.

In this type of separation prevention pipe joint, the inner diameter of the open end of the receiving port is formed large in order to allow passage of the projection at the tip of the insertion port. Therefore, when joining of the joint is completed, a gap of a certain size is created between the inner circumference of the opening end of the receiving opening and the outer circumference of the insertion opening. Can be given.

In addition, a predetermined distance is provided between the tip of the insertion slot engaged with the lock ring and the rear end of the receiving opening, and the tip of the insertion opening is located slightly behind the lock ring. By inserting up to, the expansion and contraction function can be given between the receiving opening.

[0006]

As shown in FIG. 6, when a pipe line is laid using this type of pipe joint, the straight pipe portion 42 of the pipe line 41 can cope with the external force acting. In addition, it is desirable that the pipe joint can be expanded and contracted and bent as described above. However, in a portion where the non-uniform force acts, such as the curved pipe portion 43, when the pipe joint expands or contracts, it is impossible to maintain a good coupling relationship.

In this case, in particular, the straight pipe portion 42 and the curved pipe portion 43
In the pipe joint 44 that constitutes the joint portion with, the type that allows normal expansion and contraction is used as the receiving port 45 of the straight pipe portion 42, so the insertion port 46 of the curved pipe portion 43 is used.
Inconvenience occurs when joined with.

In order to eliminate such inconvenience, it has been proposed to insert a tubular liner between the distal end of the insertion opening and the rear end of the receiving opening in the pipe joint. In this case, the presence of the liner prevents the insertion opening from moving in the axial direction of the pipe, thereby easily preventing expansion and contraction of the pipe joint.

However, although the expansion and contraction of the pipe joint can be prevented only by mounting the liner in this manner, there is a problem that the bending is not sufficiently dealt with.
Therefore, an object of the present invention is to solve such a problem and to prevent the occurrence of bending in a pipe joint with a simple structure.

[0010]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is to install a lock ring in a lock ring accommodating groove formed on the inner circumference of a receiving port and to insert the lock ring into the receiving port. Provided on the outer periphery of the tip is a protrusion that engages with the lock ring to prevent the insertion opening from coming off from the receiving opening, and the receiving opening is further received inside the receiving opening than at a position where the insertion opening can engage with the lock ring. A means for contacting the distal end of the insertion opening to restrict the movement of the insertion opening when moving to the back side of the opening is provided, and the outer peripheral surface of the insertion opening and the opening of the receiving opening are provided on the outer circumference of the insertion opening. Form a bending prevention protrusion that fills the gap between the inner peripheral surface and the bending of the insertion opening and the receiving opening, and forms a protrusion facing the end surface of the receiving opening on the outer surface of the insertion opening. Preventing the bending into the receptacle by pushing the end face of the receptacle by being screwed out and pulling out the insertion slot from the receptacle by an appropriate amount It is provided with a threaded body to correct entry of protrusion of the excess.

[0011]

According to the above construction, since the gap between the outer periphery of the insertion opening and the inner peripheral surface of the opening of the receiving opening is filled by the bending preventing projection, the receiving opening and the insertion opening are allowed to bend to each other. The range is kept to a minimum and the structure does not bend even when an external force is applied. In addition, by operating the screw body, this can be corrected when the bending prevention protrusions excessively enter the receiving port at the time of joining the joint. Therefore, it is possible to prevent a situation in which the bending prevention protrusion enters the inner circumference of the sealing material in the receiving port and deforms the sealing material, thereby deteriorating the sealing function.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 illustrates an example in which the pipe joint of the present invention is applied to the joint portion between the straight pipe portion 42 and the curved pipe portion 43 in FIG. Reference numeral 1 is a receptacle of a pipe forming the straight pipe portion, and 7 is an insertion opening of the pipe forming the curved pipe portion. A seal material accommodation groove 2 is formed in the inner periphery of a portion of the receiving port 1 on the back side of the opening portion 13, and an annular seal material 3 is disposed in the seal material accommodation groove 2. Further, a lock ring housing groove 4 is formed on the inner side of the seal material housing groove 2, and a metal lock ring 5 which is divided in the circumferential direction is attached to the lock ring housing groove 4. An inclined surface 18 is formed on the inner circumference of the lock ring 5. Between the outer peripheral side of the lock ring 5 and the inner peripheral side of the lock ring housing groove 4, a centering rubber ring 6 for centering the lock ring 5 is arranged. A protrusion 8 that can engage with the lock ring 5 from the rear side of the receptacle is integrally formed on the outer periphery of the tip of the insertion slot 7. An inclined surface 9 is formed in a tapered shape on the outer periphery of the protrusion 8.

A metal ring-shaped liner 11 is disposed between the rear end surface 10 of the receiving opening 1 and the tip of the insertion opening 7. A ring-shaped rubber member 12 is arranged on the outer peripheral side of the liner 11 for centering the liner 11. .

As shown in FIG. 1, the projecting portion 8 of the insertion opening 7 enters the inner side of the receiving opening 1 with respect to the lock ring 5, and the liner 11 is inserted.
The outer surface of the insertion opening 7 on the opening side of the receiving opening 1 with respect to the sealing material 3 facing the inner surface of the opening of the receiving opening 1 to prevent the bending to fill the gap between the receiving opening. A projecting portion 15 is formed. The bending preventing projection 15 is
As shown in FIG. 2, a plurality is formed in a circumferentially divided state, and a gap 16 is formed between the protrusions 15 adjacent to each other in the circumferential direction. In the illustrated example, the protrusions 15 are formed at eight locations at equal intervals in the circumferential direction.

On the outer surface of the insertion opening 7 at a position spaced apart from the end surface of the receiving opening 1, there are a plurality of projections 17 in the circumferential direction which are further outward in the radial direction than the bending preventing projection 15. Are formed. The protrusions 17 are formed at four locations in the circumferential direction corresponding to every other protrusion 15. The projection 15 goes beyond the opening 13 of the receiving port 1 and the projection 17
Is provided up to the position where is present.

A bolt 19 extending in the tube axis direction is screwed into the protrusion 17 in a penetrating state. The tip of this bolt 19 is
By being screwed out from the protrusion 17, the end surface 2 of the socket 1
0 can be pressed.

At the time of joining the receiving opening 1 and the insertion opening 7, first, a rubber member 12 for centering is mounted on the inner side of the receiving opening 1, and a liner 11 is arranged on the inner periphery thereof. Further, the centering rubber ring 6 is mounted in the lock ring housing groove 4, and the lock ring 5 is arranged on the inner periphery thereof. Then, the sealing material 3 is housed in the sealing material housing groove 2. The protrusion 17 of the insertion slot 7 is left in a state where the bolt 19 is not yet attached.

In this state, the insertion opening 7 is brought close to the receiving opening 1,
Both are joined using the joining apparatus 21 shown in FIG. Specifically, the saddle-shaped receiving ring 22 is engaged with the neck portion of the receiving opening 1 from above, and the saddle-shaped insertion clamp 23 is provided.
The insertion opening clamp 23 is engaged with the top of the insertion opening 7 so that the projection 17 is engaged with a side portion of the projection 17 that is remote from the end surface of the reception opening 1. The insertion clamp 23 is provided with an eccentric roller 24, and the expansion / contraction end side of the cylinder device 25 whose proximal end side is connected to the receiving ring 22 is connected to this eccentric roller 24 via a clevis 26. Cylinder device 25
Pipe lines 27 are connected to one end and the other end of the pipe, respectively, and these pipe lines 27 are connected to a manual pump 28.

When the joining device 21 is set as shown in FIG. 3, the manual pump 28 is operated to operate the cylinder device 25.
Contract. Then, the insertion opening clamp 23 engages with the protrusion 17, and the eccentric roller 24 is rotated by the contracting force of the cylinder device 25 and is tightened on the outer surface of the insertion opening 7. Then, when the cylinder device 25 is further contracted, the insertion port 7 is inserted into the receiving port 1 through the opening 13. Then,
The insertion opening 7 is first pushed into the sealing material 3 by the guide of the inclined surface 9, and the sealing material 3 is compressed between the outer circumference of the insertion opening 7 and the inner circumference of the receiving opening 1 to form the receiving opening 1 and the insertion opening 7. A seal between is secured. Further, the centering ring 6 allows the lock ring 5
Is held without being eccentric, and when the insertion opening 7 is pushed into the inner peripheral side of the lock ring 5 in this state, the lock ring 5 is elastically expanded in diameter by the inclined surfaces 9 and 18,
When the insertion opening 7 is further pushed in, the protrusion 8 passes through the lock ring 5. After that, the lock ring 5 returns to the original state and surely fits on the outer periphery of the insertion slot 7.

Then, as shown in FIG. 4, the tip of the insertion opening 7 contacts the end surface of the liner 11, so that the insertion opening 7 cannot be inserted any further, so the joining device 21 is removed. At this time, as shown in the drawing, the insertion opening 7 is deeply inserted into the inside of the receiving opening 1, and the bending preventing projection 15 is also extended to the inner periphery of the sealing material 3. Therefore, the bending preventing projection 15
May deteriorate the sealing function by deforming the sealing material.

Therefore, as shown in the drawing, the bolt 1 is attached to the protrusion 17.
9 is screwed in, and its tip is screwed out to make the end face 20 of the receiving port 1
Then, the bolt 19 is further unscrewed from that state to pull out the insertion opening 7 from the receiving opening 1 by an appropriate amount. Then, as shown in FIG.
It moves to the opening side of the receiving port 1 rather than, and the excessive intrusion is corrected.

In this state, the insertion of the insertion opening 7 into the receiving opening 1 is restricted by the bolt 19 or the liner 11,
Further, the withdrawal of the insertion opening 7 is restricted by the engagement between the protrusion 8 and the lock ring 5. For this reason, the relative movement of the receiving opening 1 and the insertion opening 7 is restricted, and the expansion and contraction dimensions of these receiving opening 1 and the insertion opening 7 are minimized.

Further, since the gap between the outer periphery of the insertion opening 7 and the inner peripheral surface of the opening 13 of the receiving opening 1 is filled by the bending preventing projection 15, the receiving opening 1 and the insertion opening 7 bend each other. The tolerance range is minimized to prevent substantial bending under external force.

By pulling out the insertion opening 7 from the receiving opening 1 by unscrewing the bolt 19 as described above, the bending preventing projection 1 is formed.
Since 5 can be installed at a predetermined position, even if the tolerance of the bending preventing projection 15 is relatively large, proper joint joining can be performed without any problem.

At the time of disassembling the pipe joint, as shown in FIGS. 5 and 2, a gap 16 between the protrusions 15 adjacent to each other in the circumferential direction.
Using, the thin plate 29 is driven in between the receiving openings. The thickness of the thin plate 29 is equal to or more than the height of the protrusion 8 at the tip of the insertion slot 7. Then, the tip of this thin plate 29 is
After passing through the inner surface of the lock ring 5, the inclined surface 18 of the lock ring 5
The lock ring 5 expands in diameter by being guided into the inner circumference of the lock ring 5 and the protrusion 8 can be pulled out through the lock ring 5 and the seal material 3.

[0026]

As described above, according to the present invention, since the gap between the outer periphery of the insertion opening and the inner peripheral surface of the opening of the receiving opening is filled by the bending preventing projection, the structure is simple, The allowable range in which the receiving port and the insertion port bend to each other can be minimized, and it can be configured not to bend even when an external force is applied, and the separation prevention pipe joint is arranged in a curved pipe place. In this case, not only can a good joining relationship be maintained, but by operating the screw body, this can be corrected if the bending prevention protrusions excessively enter the receiving port during joint joining. Therefore, it is possible to reliably prevent the occurrence of a situation in which the bending prevention protrusion enters the inner circumference of the sealing material in the receiving port and deforms the sealing material, thereby deteriorating the sealing function.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a separation prevention pipe joint according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the separation preventing pipe joint.

FIG. 3 is a view showing a joining device for the separation preventing pipe joint.

FIG. 4 is a view showing a state in which the insertion opening is most pushed into the receiving opening at the time of joining the separation preventing pipe joint.

FIG. 5 is a diagram illustrating a disassembling operation of the separation prevention pipe joint.

FIG. 6 is a diagram showing an example of a conventional pipe line including a straight pipe portion and a curved pipe portion.

[Explanation of symbols]

 1 Receptacle 5 Lock Ring 7 Insertion Port 8 Protrusion 11 Liner 15 Bending Prevention Protrusion 17 Protrusion 19 Bolt

Claims (1)

[Claims] 1. A lock ring is mounted in a lock ring receiving groove formed on the inner periphery of the receiving opening, and the lock ring is engaged with the outer periphery of the tip of the insertion opening inserted into the receiving opening from the receiving opening. A protrusion is provided to prevent the insertion opening from coming off, and the tip of the insertion opening is moved inside the receiving opening when the insertion opening is going to move further into the receiving opening than the position where the insertion opening can be engaged with the lock ring. A means for contacting with and restricting its movement is provided, and the insertion opening and the receiving opening are filled with a gap between the outer peripheral surface of the insertion opening and the inner peripheral surface of the opening of the receiving opening. Form a bending prevention protrusion to prevent the bending of the receiving end, and form a protrusion facing the end surface of the receiving opening on the outer surface of the insertion opening, and screw out from this projection to press the end surface of the receiving opening to insert the insertion opening. By removing a proper amount from the receptacle, a screw body is provided to correct excessive entry of the bending prevention protrusion into the receptacle. Disengagement prevention pipe fittings.