JP2605927Y2 - Captive fittings - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a pipe joint for preventing separation.
In particular, the present invention relates to a slip-on type detachable pipe joint that can join the receptacle and the receptacle by inserting the receptacle into the receptacle.

[0002]

2. Description of the Related Art In a slip-on type pipe fitting, a receiving material can be joined to a receiving material by inserting a sealing material inside the receiving material and inserting the opening into the receiving material while compressing the sealing material. It is configured as follows. Such a slip-on type pipe joint is provided with a detachment prevention function, and is also provided with a seismic function in which the receiving port and the insertion port are slightly movable in a direction along the axial center direction and are capable of expanding and contracting. In the past, the present applicant has proposed a straight pipe-shaped separation preventing pipe joint having the configuration shown in FIG.

[0003] That is, as shown in FIG. 9, a seal material accommodating groove 22 is formed on the inner periphery of the receiving port 21, and an annular seal material 23 is disposed in the seal material accommodating groove 22. A lock ring accommodating groove 24 having a rear side surface 24a and a receiving port opening side inclined surface 24b is formed on the back side, and a metal lock ring 25 divided in a circumferential direction is provided in the lock ring accommodating groove 24. It is mounted individually. Between the outer peripheral side of the lock ring 25 and the inner peripheral side of the lock ring housing groove 24, a centering rubber ring 26 for centering the lock ring 25 is arranged. And the slot 27
Is formed on the outer periphery of the lock ring 25 so as to engage with the lock ring 25 from the rear side of the socket.
When the insertion port 27 is inserted, the projection 2 at the tip of the insertion port 27
8, the protrusion 28 is allowed to pass through the inside thereof, and after the passage, the projection 27 is engaged with the protrusion 28 so that the insertion opening 27 is separated from the receiving opening 21. To prevent it.

[0004] Further, the detachable pipe joint has a lock ring 2 having a space between a rear side surface 24a and a receiving opening side inclined surface 24b in the lock ring receiving groove 24.
5 are provided with a margin. Then, even when a change occurs in the buried ground due to an earthquake or the like and an external force acts in a direction in which the receiving port 21 and the insertion port 27 are separated from each other, the lock ring 25 engaged with the projection 28 of the insertion port 27 is locked. It moves along the tube axis direction (removal direction) until it comes into contact with the inlet opening side inclined surface 22b of the ring accommodating groove 24 (indicated by a virtual line in FIG. 9), and the insertion port 27 and the reception port 21 are joined. , And can be extended and contracted within a range of a distance A to each other.

[0005] When the lock ring 25 is assembled to the receiving port 21 in this detachment prevention pipe joint, after the centering rubber ring 26 is accommodated in the lock ring accommodating groove 24,
The metal lock ring 25 is inserted into the lock ring accommodating groove 24 from the opening side of the receiving port 21 while reducing the diameter by applying force to the metal lock ring 25, and the lock ring 25 is mounted in the lock ring accommodating groove 24 by releasing the force.

[0006]

However, by applying the above-mentioned conventional anti-separation fitting to a deformed pipe such as a curved pipe, the insertion port 27 and the receiving port 21 can expand and contract with each other along the pipe axis direction. With the structure, since the axial directions of both ends of the deformed pipe are different from each other, when one end of the deformed pipe expands and contracts in the axial direction, the other end of the deformed pipe moves in a direction different from the axial direction. There is a possibility that a force acts and a good joining relationship cannot be maintained. That is, in the deformed pipe, the amount of expansion and contraction (distance A in FIG. 9) at the joint portion must be minimized.

As a measure to cope with this problem, as shown in FIG. 10, the lock ring 29 is widened so that the space between the rear side surface 4a of the lock ring accommodating groove 4 and the inclined surface 24b on the receiving opening side is almost filled. According to this structure, the expansion and contraction distance allowing the change in the relative position of the insertion opening 27 and the reception opening 21 in the tube axis direction can be increased by the width of the lock ring 29. Can be smaller. However, in this case, since the lock ring 29 has a wide shape, a large force is required for the diameter reduction operation and the diameter expansion operation of the lock ring 29. It becomes difficult to insert the insertion port 27 into the receiving port 21.

The present invention solves the above-mentioned problem, and it is possible to minimize the expansion and contraction of the joined receptacle and the insertion port in the axial direction of the pipe, and to store the lock ring and receive the insertion port. It is an object of the present invention to provide a detachment prevention pipe joint that can easily perform an insertion operation into a pipe.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention forms a lock ring accommodating groove having an inner side surface and a slope on the side of a receiving opening on the inner periphery of the receiving opening. A plurality of lock rings are arranged side by side in the direction along the pipe axis so as to close the gap between the rear side surface of the receiving groove and the inclined surface on the receiving opening side, and the axes of the plurality of lock rings are aligned with the axial center of the receiving opening. One centering ring to be fitted is interposed.

[0010]

According to the above construction, a plurality of lock rings are mounted side by side in the direction along the pipe axis so as to substantially close the lock ring accommodating groove, so that when an external force acts in a direction in which the insertion opening and the receiving opening are separated from each other. The end of the plurality of lock rings engaged with the projection of the insertion opening on the receiving opening side immediately contacts the inclined surface of the locking ring receiving groove on the receiving opening side, and the axial center of the receiving opening and the insertion opening. Expansion and contraction in the direction can be minimized, and the width of each lock ring can be reduced, so that the diameter reduction operation and the diameter expansion operation of each lock ring can be easily performed with a small force.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a receiving port, in which a rubber sealing material 3 is disposed in a sealing material housing groove 2 on the inner periphery thereof. A lock ring housing groove 4 is formed on the inner periphery of the receiving port 1 on the back side of the seal material housing groove 2, and the lock ring housing groove 4 is provided with first and second lock rings 5 each of which is circumferentially divided. , 6 are stored in two parts. Both lock rings 5,
Between the outer peripheral surface of the lock ring 6 and the inner peripheral surface of the lock ring housing groove 4, a rubber centering ring 7 for aligning the axes of the lock rings 5 and 6 with the axis of the receiving port 1 is interposed. Is equipped. 8
Is an insertion hole to be inserted into the socket 1, and a projection 9 which can be engaged with the second lock ring 6 from the back side of the socket is formed on the outer periphery of the distal end portion.

The rear side surface 4a of the lock ring receiving groove 4 of the receiving port 1 is a vertical surface substantially along the pipe diameter direction, while the portion of the lock ring receiving groove 4 on the receiving port opening side is formed as an inclined surface. Have been. The space between the rear side surface 4a and the inlet opening side inclined surface 4b of the lock ring housing groove 4 is almost filled by the first and second lock rings 5 and 6. Inclined portions 5a, 6a are formed on the inner periphery of the lock ring 5, 6 near the receiving opening, respectively.
In particular, as the first lock ring 5 disposed on the back side of the receiving port, the same one as the conventional lock ring is also used. The second lock ring 6 is formed to be narrower than the first lock ring 5. An inclined portion 10 is formed on the outer periphery of the distal end portion of the insertion opening 8, and the lock rings 5, 6 are smoothly expanded at the distal end portion of the insertion opening 8, and inserted into the lock rings 5, 6. 8 can be inserted.

At the time of joining the receiving port 1 and the insertion port 8, first, the sealing material 3 is stored in the sealing material receiving groove 2 of the receiving port 1. Then, the centering ring 7 is attached to the lock ring housing groove 4,
The two lock rings 5, 6 are arranged on the inner circumference. On this occasion,
First, the first lock ring 5 is inserted into the lock ring accommodating groove 4 from the opening side of the receiving port 1 while reducing the diameter by applying a force to the first lock ring 5. Is mounted, and then the second lock ring 6 is mounted in the same manner. Here, lock rings 5, 6
Is divided into two parts, the width of which is equal to or smaller than that of the conventional one, so that the work of reducing the diameter of each of the lock rings 5, 6 can be easily performed one by one with a small force.

In this state, the insertion port 8 is inserted into the reception port 1. Then, first, the sealing material 3 is compressed on the outer periphery of the insertion port 8, and the seal between the receiving port 1 and the insertion port 8 is secured. Further, both lock rings 5 and 6 are held by the centering ring 7 without being eccentric, and as shown in FIG. 2, in a state where the distal end of the insertion opening 8 is engaged with the inner periphery of the second lock ring 6. When the insertion opening 8 is pushed in, the second lock ring 6 elastically expands in diameter due to the interaction between the inclined portion 10 on the outer periphery of the distal end of the insertion opening 8 and the inclined portion 6a on the inner periphery of the second lock ring 6. I do. Then, when the insertion port 8 is pushed in a state where the front end of the insertion port 8 is engaged with the inner circumference of the first lock ring 5, the inclined portion 10 on the outer circumference of the front end of the insertion port 8 and the inside of the first lock ring 5 are formed. The first lock ring 5 elastically expands in diameter by the interaction with the circumferential inclined portion 5a. As described above, since the diameters of the second lock ring 6 and the first lock ring 5 are increased stepwise, the force at the time of pushing the insertion opening 8 may be the same as the conventional force. Thereafter, when the insertion opening 8 is further pushed in, as shown in FIGS. 3 and 1, the protrusion 9 on the outer periphery of the insertion opening 8 easily moves between the second lock ring 6 and the first lock ring 5. Passing around.

After the projection 9 of the insertion port 8 has passed through the lock rings 5 and 6, the lock rings 5 and 6 return to the original state, and fit into the outer periphery of the insertion port 8 reliably. For this reason, even if the insertion opening 8 attempts to move away from the receiving opening 1 due to an earthquake or the like, the projection 9 of the insertion opening 8 contacts the inner side surface of the first lock ring 5 as shown in FIG. The outer periphery of the portion of the second lock ring 6 near the receiving opening is immediately in contact with and engages with the inclined surface 4b of the lock ring housing groove 4, and has a small amount of expansion and contraction B, thereby ensuring a secure separation prevention function. Is exhibited. Therefore, even when an earthquake or the like occurs by using the detachment prevention pipe joint structure for a deformed pipe such as a bent pipe, a good joining relationship can be maintained.

Next, another embodiment of the present invention will be described. The components having the same functions as those of the above embodiment are denoted by the same reference numerals, and the description thereof will be omitted. As shown in FIG. 5, in this embodiment, in the second lock ring 16 disposed on the receiving opening side of the lock ring receiving groove 4, inclined portions 16a and 16b are provided at both ends on the inner peripheral side. The first ring is formed so as to face the first side and is disposed on the back side of the receiving end of the lock ring housing groove 4.
Of the lock ring 15, the inclined portion 16 b of the second lock ring 16 on the inner side of the port
Is formed so as to face the outer peripheral side.

With such a configuration, similarly to the above-described embodiment, as shown in FIGS. 5 to 8, the projection 9 of the insertion hole 8 comes into contact with and engages with the inner side surface of the first lock ring 15. At the same time, the outer periphery of the portion of the second lock ring 16 near the receiving opening is immediately in contact with and engaged with the inclined surface 4b of the lock ring housing groove 4, and the detachment preventing function is exhibited with a small amount of expansion and contraction C. Further, since the lock rings 15 and 16 are divided into two, the work of reducing the diameter and the work of increasing the diameter of each lock ring 15 and 16 can be performed with a small force, and the arrangement of the lock rings 15 and 16 in the lock ring housing groove 4. Also, the work of inserting the insertion opening 8 can be easily performed.

Further, according to the detachment preventing pipe joint structure, the first lock ring 15 and the second lock ring 16
Because the entire surface of the adjacent side is fitted to each other,
The force transfer function between the first and second lock rings 15 and 16 is favorably performed, and a more reliable separation prevention function is exhibited.

In the above embodiment, the case where the number of the lock rings is two has been described. However, the present invention is not limited to this. It may be mounted so that the space between the opening side inclined surface and the opening side inclined surface is almost closed.

[0020]

As described above, according to the present invention, a lock ring accommodating groove having a back side surface and an inclined surface on the side of the receiving opening is formed on the inner periphery of the receiving port, and the back side surface of the locking ring receiving groove is formed. By installing multiple lock rings side by side in the direction along the pipe axis so that the gap between the port and the port opening side slope is almost closed, the distance between the port and the port in the direction away from each other is minimized. The width of each lock ring can be reduced while being reduced, and the diameter reduction and expansion operations of each lock ring can be easily performed with a small force. Insertion of the insertion opening can be performed easily. In particular, if this structure is applied to a part of a curved part of a pipe, such as a deformed pipe part of the pipe, which is to be prevented from moving and separating due to a non-average force of water pressure or centrifugal force due to flow velocity, The protective concrete portion can be reduced or eliminated. In addition, since parts other than the lock ring can also be used as the conventional anti-separation pipe joint of the earthquake-resistant structure, the manufacturing cost is reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a coupling according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a joining step of the pipe joint for preventing separation.

FIG. 3 is a cross-sectional view showing a joining step of the same separation preventing pipe joint.

FIG. 4 is a cross-sectional view showing a detachment prevention state of the detachment prevention fitting.

FIG. 5 is a cross-sectional view of a separation preventing pipe joint according to another embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a joining step of the same separation preventing pipe joint.

FIG. 7 is a cross-sectional view showing a joining step of the same separation preventing pipe joint.

FIG. 8 is a cross-sectional view showing the detachment prevention fitting of the same.

FIG. 9 is a cross-sectional view of a conventional separation prevention pipe joint.

FIG. 10 is a cross-sectional view of a conventional separation prevention pipe joint.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Receiving port 4 Lock ring accommodation groove 4a Back side surface 4b Receiving port opening side inclined surface 5,15 First lock ring 5a, 6a, 15a, 16a, 16b Inclined portion 6,16 Second lock ring 8 Insertion 9 Projection Department

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-52-29624 (JP, A) JP-A-54-23219 (JP, A) Fully open Showa 59-177886 (JP, U) Really open 67890 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16L 21/00-21/08

Claims (1)

(57) [Scope of request for utility model registration] 1. A lock ring accommodating groove having a rear side surface and a receiving opening side inclined surface is formed on an inner periphery of a receiving opening, and a gap between the rear side surface and the receiving opening opening side inclined surface of the lock ring receiving groove is formed. the packed as side by side in a direction along a plurality of locking rings to the tube axis of the plurality of the lock ring with mounting
One centering ring that aligns the axis with the axis of the socket
Then, on the outer periphery of the distal end portion of the insertion hole inserted into the socket, the lock ring can be elastically expanded in diameter at the time of insertion so that the inside of the lock ring can pass through the inside of the socket and after passing therethrough. A detachable pipe joint, wherein a protrusion is formed on the lock ring so as to engage with the lock ring from the back side.