JPH07332555A - Separation preventing pipe joint - Google Patents

Abstract

PURPOSE:To prevent a pipe joint from being bent by a simple constitution. CONSTITUTION:A lock ring 5 is mounted in a lock ring receiving groove 4 formed in the internal periphery of a socket 1. A protruded part 8, engaged with the lock ring 5 to prevent separating a spigot 7 from the socket 1, is provided in the periphery of a point end of the spigot 7 inserted to the socket 1. A liner 11, brought into contact with a point end of this spigot to restrict moving it in the case that the spigot 7 tends to move further to a deep side of the socket from a position where the spigot 7 can be engaged with the lock ring 5, is provided 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 the socket 1 is filled, which prevents flection between the spigot 7 and the socket 1, is integrally formed in the periphery of the spigot 7.

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. 8, 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 inner side of the opening is provided. A bending preventing projection is integrally formed so as to prevent a bending between the insertion opening and the receiving opening by filling a gap with the inner peripheral surface.

[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.

[0012]

Embodiments 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.

A plurality of stoppers 17 are provided on the outer surface of the insertion opening 7 at a position spaced apart from the end surface of the receiving opening 1 in the circumferential direction so as to project further outward in the radial direction than the bending preventing projection 15. Are formed. The stoppers 17 are formed at four locations in the circumferential direction corresponding to every other protrusion 15. The protrusion 15 is provided beyond the opening 13 of the receiving port 1 to a position where the stopper 17 exists.

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.

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 clamp 23 is engaged with the top portion of the insertion opening 7 so that the stopper 17 is engaged with a side portion of the stopper 17 which is remote from the end surface of the reception opening 1. The eccentric roller 2 is attached to the insertion opening clamp 23.
4 is provided, and the expansion / contraction end side of the cylinder device 25 whose base end side is connected to the receiving ring 22 is connected to this eccentric roller 24 via the clevis 26. Pipe lines 27 are connected to one end and the other end of the cylinder device 25, 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 hole clamp 23 is attached to the stopper 1.
7 and the eccentric roller 24 engages with the cylinder device 2
It is rotated by the contracting force of 5 and tightens on the outer surface of the insertion slot 7. Then, when the cylinder device 25 is further contracted,
The insertion opening 7 is inserted into the receiving opening 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 be inserted into the receiving opening 1. A seal with the mouth 7 is ensured. Further, the lock ring 5 is held by the centering ring 6 without being eccentric, and in this state, the insertion port 7
When the lock ring 5 is pushed toward the inner peripheral side of the lock ring 5, the lock ring 5 is elastically expanded similarly by the inclined surfaces 9 and 18, and when the insertion opening 7 is further pushed, the protrusion 8 passes through the lock ring 5. To do. After that, the lock ring 5 returns to the original state and surely fits on the outer periphery of the insertion slot 7. Therefore, even if the insertion opening 7 tries to move in a direction away from the receiving opening 1, the projection 8 comes into contact with and engages with the inner side surface of the lock ring 5, so that a reliable removal preventing function is exerted.

As shown in FIG. 1, the tip of the insertion slot 7 approaches the end surface of the liner 11, so that the relative movement of the insertion slot 1 and the insertion slot 7 is restricted, and the socket 1 and the insertion slot are inserted. Expansion and contraction with 7 is minimized.

With this, the joining work of the joint is completed, so that the state shown in FIG. 1 is obtained by removing the joining device 21. As described above, a slight expansion and contraction dimension remains between the receiving opening 1 and the insertion opening 7, and FIG. 4 shows a state in which the insertion opening 7 is pushed most into the receiving opening 1. 5
Shows the state that the most out of the socket 1. As shown in the drawings, in any case, the bending preventing projection 15 faces the inner peripheral surface of the opening 13 of the receiving port 1, and a reliable bending preventing effect can be obtained. Further, the projection 15 is dimensioned so as not to hit the sealing material 3 even in the case shown in FIG.

As a result, 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 always filled by the bending preventing projection 15, so that the receiving opening 1 and the insertion opening 7 are separated from each other. The bending tolerance of each other is minimized, and substantial bending is prevented even when an external force is applied.

At the time of disassembling the pipe joint, as shown in FIGS. 6 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.

In FIG. 7, the above-mentioned insertion port 7 is replaced with a receiving port 31 for a deformed pipe.
It shows the one joined with. As shown in the figure, the socket 31 for the deformed pipe
Then, since the expansion and contraction allowance of the pipe joint is not required at all,
This insertion opening 7 when the projection 8 of the
The rear end surface 10 of the receptacle 31 is formed at a position close to the front end surface of the. A push ring 32, which is divided in the circumferential direction, is arranged on the outer periphery of the insertion opening 7 at the position of the bending preventing projection 15. By being pressed against the outer surface of the, the complete bending is prevented. Even in the case of the pipe joint shown in FIG. 7, the joining is performed by the joining device 21 shown in FIG.

[0024]

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 opening and the insertion opening bend together can be minimized, and it can be configured not to bend even when an external force is applied, and the disconnection prevention pipe joint is arranged in a curved piping place. Even in this case, a good bonding relationship can be maintained.

[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 in the separation preventing pipe joint.

FIG. 5 is a view showing a state where the insertion opening is most pulled out from the receiving opening in the separation preventing pipe joint.

FIG. 6 is a diagram illustrating a disassembling operation of the separation prevention pipe joint.

FIG. 7 is a view showing another example of the separation prevention pipe joint according to the present invention.

FIG. 8 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 Receiving Port 4 Lock Ring Receiving Groove 5 Lock Ring 7 Inserting Port 8 Protrusion 10 Back End Face 11 Liner 15 Bending Prevention Protrusion

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. A disconnection prevention pipe joint, characterized in that a bending prevention projection is integrally formed to prevent it from bending.