JPH0823397B2 - Detachment prevention fitting - Google Patents

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,
In particular, the present invention relates to a slip-on type separation prevention pipe joint in which an annular sealing material is compressed between the receiving ports when the receiving port is inserted into the receiving ports.

[0002]

2. Description of the Related Art Conventionally, a slip-on type separation prevention pipe joint in which an annular groove is formed in each of the inner periphery of the receiving port and the outer periphery of the insertion port, and an annular lock ring is fitted in both annular grooves. It has been known. The lock ring is configured so as to be open in the circumferential direction, and the diameter thereof is reduced by a plurality of circumferential direction set bolts screwed from the outer periphery of the receiving port and fitted into the annular groove on the insertion side.

When joining such a pipe joint, first, the lock ring is reduced in diameter and inserted into the receiving port, and the reducing force is released at the position of the annular groove to fit into the annular groove. Next, the insertion port is inserted into the receiving port, and the insertion port is passed through the inside of the lock ring that can be opened. Then, when the annular groove of the insertion slot reaches the position of the lock ring, screw each set bolt from the outer periphery of the receiving socket to reduce the diameter of the lock ring, and then insert this lock ring into the annular groove of the insertion slot. , Fit into both annular grooves of the socket.

[0004]

However, in the above-mentioned conventional structure, a plurality of set bolts must be manually screwed in to reduce the diameter of the lock ring, which requires time and labor to join the pipes. There is a problem. In addition, the withdrawal force acting on the joint is only received by the mere engagement of the lock ring and the annular groove, so it has a function of preventing separation, but it does not have a seismic function beyond this. There are also problems.

Therefore, the present invention solves such a problem and enables the lock ring to be easily mounted so that the pipe joining work can be performed efficiently, and at the same time, the joined joint portion has not only the function of preventing separation but also the seismic resistance. The purpose is to be able to add functions as well.

[0006]

In order to achieve the above object, the present invention is a slip-on type detachment in which an annular sealing material is compressed between receiving openings when the insertion opening is inserted into the receiving openings. A preventive pipe joint, in which an annular projection is formed at the tip of the insertion opening to be inserted into the receiving opening, and the receiving opening is closer to the receiving opening opening side than the protruding portion of the insertion opening when inserted into this receiving opening. An annular groove is formed on the inner periphery of the inner peripheral surface, and an inner peripheral taper surface whose inner diameter gradually decreases toward the receiving opening end is formed in the annular groove, and the annular groove can engage with the protrusion of the insertion opening. A lock ring, so that the outer peripheral surface of the lock ring can come into contact with the tapered surface, and the lock ring is bonded to the lock ring and integrated with the lock ring in the annular groove. Push this lock ring in the axial direction of the pipe to push the inner ring It is provided with a resilient member to be pressed against the tapered surface.

[0007]

With such a structure, when joining the pipes together, the lock ring and the elastic body, which are integrated by adhesion, are both reduced in diameter and inserted into the receiving port, and these are fitted into the annular groove to lock. Ring installation is complete. At this time, since the lock ring and the elastic body are integrated by adhesion, they can be easily handled. Then, when the insertion opening is inserted into the receiving opening in this state, the annular projection of the insertion opening pushes the lock ring against the elastic force of the elastic body, so that the annular projection can pass through the position of the lock ring. is there.

After that, the lock ring is pressed in the pipe axial direction by the elastic body and is brought into contact with the tapered surface of the annular groove by this pressing, so that its diameter is prevented from expanding and the annular ring of the insertion opening is surely secured. By engaging with each other, a desired separation prevention effect can be obtained.

When a large pull-out force is applied between the receiving opening and the receiving opening due to an earthquake or the like, the annular protrusion of the opening strongly engages with the lock ring. Then, due to the wedge action of the tapered surface, a large inward force in the pipe radial direction is applied to the lock ring, and the engagement between the lock ring and the annular protrusion becomes extremely strong, and the slip-out exceeds the normal separation prevention effect. Preventive effect, that is, seismic resistance is obtained.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 is a socket for a cast iron pipe, and 2 is an insertion opening, into which an insertion opening 2 can be inserted. An annular groove 3 is formed in the inner periphery of the receiving opening 1 in the vicinity of the opening end, and an annular rubber seal member 4 that is compressed between the receiving opening is attached to the annular groove 3. There is.

Another annular groove 5 is formed on the inner periphery of the receiving port 1 on the inner side of the annular groove 3. The annular groove 5 is formed with an inner peripheral tapered surface 6 whose inner diameter gradually decreases toward the receiving opening end, and a rear side surface 7 in the pipe radial direction.

A cast iron lock ring 8 is fitted in the annular groove 5. As shown in FIG. 2, the lock ring 8 is formed in an annular shape that is divided in the circumferential direction so as to be open, and has a tapered outer peripheral surface 9 that can contact the inner peripheral tapered surface 6. A rubber body 10 is bonded to the outer peripheral portion of the end surface of the lock ring 8 on the rear side of the receiving port. This 10 is SB
Like the lock ring 8, it is made of R or NR and is formed into a ring shape divided in the circumferential direction. It contacts the inner peripheral taper surface 6 portion on the inner side of the receptacle and the inner side surface 7, and the elastic force of the lock ring 8 Is pressed in the tube axis direction toward the inner peripheral tapered surface 6.

A step portion 11 in the pipe radial direction is formed at the rear end of the receiving opening 1 at a certain distance from the annular groove 5. An annular projection 12 is formed on the outer periphery of the tip of the insertion slot 2, and the outer periphery of the opening of the insertion slot 2 further on the tip side of the annular projection 12 is continuous with the annular projection 12 and locked. Tapered surface 13 that can be engaged with the ring 8 and has a tapered shape
Are formed.

In such a structure, when the pipes are joined together, the lock ring 8 and the rubber body which are integrated are first formed.
The diameters of 10 and 10 are reduced, and they are inserted into the receiving opening 1 and fitted into the annular groove 5. Further, the seal material 4 is fitted in the annular groove 3.

Next, the insertion slot 2 is inserted into the receiving slot 1. Then, guided by the tapered surface 13, the sealing material 4 is first compressed between the receiving opening. After that, the insertion slot 2 reaches the position of the lock ring 8, and its tapered surface 13 engages with the lock ring 8 to push the lock ring 8 wide as shown in FIG. At this time, the rubber body 10 is compressed by the lock ring 8 and elastically deformed, so that the annular projection 12 of the insertion slot 2 easily passes through the position of the lock ring 8. Then, after that, the elastic repulsive force of the rubber body 10 returns the lock ring 8 to the original position, and the joining of the pipes is completed as shown in FIG.

Since a certain distance is provided between the lock ring 8 and the step portion 11, as long as the annular projection 12 reciprocates within the range, the joint portion can be expanded and contracted.

When a withdrawal force is applied between the receiving and inserting openings, the annular projection 12 engages with the lock ring 8 and the inner peripheral tapered surface 6 prevents the lock ring 8 from moving in the pipe axis direction. Therefore, the desired function of preventing separation is exhibited.
When a large pulling force is applied between the receiving and inserting openings due to an earthquake or the like, the annular protrusion 12 strongly engages with the lock ring 8. Then, due to the wedge action of the tapered surface 6, a large force inward in the pipe radial direction is applied to the lock ring 8,
As shown in FIG. 6, the engagement between the lock ring 8 and the annular projection 12 is extremely strong, and a seismic resistance effect that is a slip-out prevention effect that is higher than the normal disengagement prevention effect is obtained.

[0018]

As described above, according to the present invention, the joining of the pipes is completed only by inserting the insertion port into the receiving port in which the lock ring and the elastic body integrated by adhesion are mounted at predetermined positions. Then, the separation prevention pipe joint can be configured. At this time, since the lock ring and the elastic body are integrated by adhesion as described above, they can be easily handled. In addition, when a large pull-out force acts between the receiving and inserting openings, the engagement of the lock ring and the annular projection of the inserting opening becomes extremely strong due to the action of the inner peripheral taper surface, so that the joint part is given a seismic effect. be able to.

[Brief description of drawings]

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

FIG. 2 is an overall side view of a lock ring and a rubber body in FIG.

FIG. 3 is a cross-sectional view for explaining a work of joining pipes together.

FIG. 4 is a cross-sectional view showing a state in which a large withdrawal force is applied between the receiving and inserting openings.

[Explanation of symbols]

 1 Receptacle 2 Insertion 5 Annular groove 6 Inner taper surface 8 Lock ring 10 Rubber body 12 Annular protrusion

Claims (1)

[Claims] 1. A slip-on type separation prevention pipe joint, wherein an annular sealing material is compressed between the receiving openings when the inserting opening is inserted into the receiving opening. An annular projection is formed at the tip of the mouth, and an annular groove is formed on the inner periphery of the receiving opening at the receiving opening end side of the receiving opening when inserted into the receiving opening. , Forming an inner peripheral tapered surface having an inner diameter gradually decreasing toward the receiving opening end, and fitting a lock ring capable of engaging with the protrusion of the insertion slot into the annular groove, and fixing the outer peripheral surface of the lock ring. When the taper surface can be contacted and the ring groove is bonded to the lock ring and integrated with the lock ring.
A detachment prevention pipe joint is also provided with an elastic body that pushes the lock ring in the pipe axis direction to press the lock ring against the inner peripheral tapered surface.