JPH08233168A - Breakaway preventing pipe joint - Google Patents

Abstract

PURPOSE: To let a slip-on type pipe joint be endowed with a breakaway preventing function with no ring shaped groove formed around the outer circumference of a spigot. CONSTITUTION: A ring shaped projected section 18 is welded in the outer circumference of a spigot 14 at the outside of a socket 12, and a brim section 17 is formed in the outer circumference at the opening section of the socket. A ring shaped housing 21 is outwardly fitted in over a part of the socket 12 which crosses the brim section 17, from a position parted farther than the projected section 18 at the spigot 14 from the socket 12. A first lock ring 28 capable of being engaged with the brim section 17 is fitted in a first ring shaped groove 24 which is formed in the inner circumference corresponding to a socket section crossing the brim section 17 at the housing 21. And a second lock ring 32 capable of being engaged with the projected section 18 is fitted in a second ring shaped groove 25 which is formed in the inner circumference at a position parted farther than the projected section 18 at the housing 21 from the socket.

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 a type of pipe joint, there is known one in which an annular sealing material is compressed between an inner surface of a receiving port and an outer surface of an insertion port. With this pipe joint, simply insert the insertion port inside the receiving port with the annular sealing material in the receiving port.
It is called a slip-on type pipe joint because it can exert a predetermined sealing function by compressing the sealing material between the receiving and inserting ports.

This slip-on type pipe joint has a sufficient expansion / contraction function because it has a construction in which the insertion port is inserted into the receiving port and the sealing material is compressed as described above.
However, in some cases, it may be desirable to provide a slip-on type pipe fitting with a separation prevention function that prevents expansion and contraction.In such a case, an annular groove is formed on the inner circumference of the receiving opening and the outer circumference of the insertion opening. In general, the lock ring is engaged with the both annular grooves.

[0004]

However, when the annular groove is formed on the outer periphery of the insertion port, the wall thickness is reduced accordingly, so that the strength is lowered and the sealing performance between the receiving port and the insertion port is also reduced. It has a problem that it may have an adverse effect.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve such a problem and to provide a slip-on type pipe joint with a separation preventing function without forming an annular groove on the outer periphery of the insertion opening. And

[0006]

In order to achieve this object, the present invention provides a pipe joint for compressing an annular sealing material between the inner surface of the receiving opening and the outer surface of the receiving opening. Welding an annular protrusion on the outer periphery, forming a collar portion on the outer periphery of the opening of the receiving opening, from the position farther from the receiving portion than the protruding portion in the insertion opening over the receiving portion beyond the brim portion An annular housing to be fitted is provided, and a first annular groove is formed on the inner periphery of the housing at a position corresponding to the receiving portion beyond the flange portion. A first lock ring engageable with the collar is fitted to form a second annular groove on the inner periphery of the housing at a position farther from the receptacle than the protrusion, and the second annular groove is formed. The second that can engage with the protrusion It is those that fitted the Kkuringu.

[0007]

According to this structure, the first lock ring fitted in the first annular groove of the housing engages with the flange portion of the receiving opening, and the second lock ring fitted in the second annular groove. By engaging the lock ring with the protrusion of the insertion opening, a separation prevention function is provided between the receiving opening and the insertion opening. At that time, since the annular protrusion is simply welded to the outer periphery of the insertion opening, a required separation preventing function is provided without forming an annular groove on the outer periphery of the insertion opening.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a receiving port 12 is formed at the end of one cast iron pipe 11 to be joined to each other, and a receiving port 12 is provided at the end of the other cast iron pipe 13. Inserted inside 14
Are formed. A sealant accommodating portion 15 is provided on the inner circumference of the receiving port 12.
The sealing material 16 accommodated in the sealing material accommodating portion 15 is formed by inserting the insertion opening 14 into the receiving opening 12.
By being compressed between the inner surface of 12 and the outer surface of the insertion port 14,
It is configured to have a predetermined sealing function.
A collar 17 is formed on the outer periphery of the opening of the receiving port 12.

An annular projection 18 having a rectangular cross section is fitted on the outer periphery of the insertion opening 14 outside the receiving opening 12 and fixed by welding. 19 is the weld. The protrusion 18 is configured to be located near the opening end face 20 of the receiving opening 12 when the insertion opening 14 is inserted to a predetermined position inside the receiving opening 12.

From the outer peripheral portion of the receiving port 12 beyond the brim portion 17,
The annular housing 21 made of cast iron is externally fitted over the range from the projection 18 of the insertion opening 14 inserted to a predetermined position inside the receiving opening 12 to the outer peripheral portion of the position farther from the receiving opening 12. There is. In this housing 21, a receiving side inner peripheral surface 22 having a diameter slightly larger than that of the flange portion 17 is formed in a portion fitted into the receiving opening 12, and a portion fitted in the inserting opening 14 is fitted. At the insertion side inner peripheral surface 23, which has a diameter slightly larger than that of the protrusion 18,
Are formed. The collar portion 17 on the inner peripheral surface 22 on the receiving side
A first annular groove 24 in the circumferential direction is formed at a position corresponding to the receiving portion beyond. Further, a second annular groove 25 in the circumferential direction is formed on the insertion-side inner peripheral surface 23 at a position farther from the receiving opening 12 than the protruding portion 18. Each of the first and second annular grooves 24, 25 is formed in a rectangular cross section.

A first annular groove formed on the inner peripheral surface 22 of the receiving side
A first lock ring 28 is accommodated in 24. The first lock ring 28 has a rectangular cross-section and is formed in a circumferentially divided manner. Set bolts 29 screwed in the pipe radial direction from the outer surface of the housing 21 toward the first annular groove 24 are arranged at a plurality of positions in the circumferential direction. This set bolt 29 is formed with a hexagonal hole without a head, and its outer end is the housing
By pressing the outer surface of the first lock ring 28 while it is screwed into the inside 21, it is possible to maintain the first lock ring 28 in a tight state and hold it on the outer peripheral surface 30 of the receptacle 12. is there. When the first lock ring 28 is thus tightened on the outer peripheral surface 30 of the receiving port 12, the first lock ring 28 can engage with both the first annular groove 24 and the flange portion 17 in the pipe axial direction. Become.

A second annular groove formed on the inner peripheral surface 23 on the insertion side
A second lock ring 32 is accommodated in 25. The second lock ring 32 is formed so as to be freely opened in the circumferential direction so that it is fitted and held in the second annular groove 25. On the inner circumference of the second lock ring 32, a tapered surface 33 having an inner diameter that gradually increases toward the projection 18 is formed. The second in the protrusion 18
On the outer periphery of the lock ring 32 side of the
A tapered surface 34 corresponding to the tapered surface 33 is formed.

In such a structure, when the joint is joined, the sealing material 16 is stored in the receiving portion 15 of the receiving port 12 in advance, and the first annular groove 24 of the housing is tightened first. Hold the lock ring 28 of.

Then, for example, in that state, the housing 21
To cover the receiving opening 12 and elastically expand the diameter of the first lock ring 28 so that the flange portion 17 of the receiving opening 12 is deeper than the first lock ring 28 in the receiving opening side inner peripheral surface 22. Fit to the position corresponding to. Then, the first lock ring 28 in the annular groove 24
However, since it is positioned corresponding to the outer peripheral surface 30 of the receiving port 12 beyond the flange portion 17, by holding the first lock ring 28 in a reduced diameter state by the set bolt 29 as shown in the drawing, The first lock ring 28 is tightened on the outer peripheral surface 30.

Next, the insertion opening 14 is inserted into the receiving opening 12 in this state. Then, the sealing material 16 is compressed between the outer peripheral surface of the insertion opening 14 and the inner peripheral surface of the housing portion 15 of the receiving opening 12, and a required sealing function is provided between the receiving opening and the insertion opening. Then, the second lock ring 32, which has been fitted to the insertion opening 14 in advance and has an opening property, is inserted into the gap 35 between the outer peripheral surface of the insertion opening 14 and the insertion side inner peripheral surface 23 of the housing 21. And is fitted into the second annular groove 25.

Then, the first lock ring 28 engages with both the first annular groove 24 of the housing 21 and the flange portion 17 of the receptacle 12, and the second locking groove 28 is fitted in the second annular groove 25. By engaging the tapered surface 33 of the lock ring 32 with the tapered surface 34 of the protrusion 18, a predetermined separation prevention function is provided between the receiving opening 12 and the insertion opening 14. Moreover, the second lock ring
32 and the projection 18 of the insertion slot 14 are engaged with each other through the tapered surfaces 33, 34 of each other, so that when the withdrawal force acts between the socket insertion slot, the wedges between these tapered surfaces 33, 34 Due to the action, a very large slip-out prevention force can be generated.

By doing so, a separation preventing function can be imparted without forming an annular groove on the outer periphery of the insertion opening 14, and the separation can be carried out without causing a problem in the strength and sealing property of the joint portion. A preventive function can be added.

The second lock ring 32 is formed so that it can be opened freely and is fitted into the second annular groove 25.
For example, the cross section can be formed to be relatively small compared to the case where the set bolt is tightened to the outer peripheral surface similarly to the first lock ring 28.

Further, instead of the second lock ring 32, an inner peripheral projection is integrally formed on the housing 21, and when this inner peripheral projection is to be engaged with the projection 18 of the insertion slot 14, it is inserted at the factory. Mouth 14
Before welding the protruding portion 18 to the housing 21, the housing 21 must be fitted in the insertion opening 14, and the pipe with the housing 21 attached must be transported to the laying site, which is extremely inefficient. However, since the second lock ring 32 is fitted in the second annular groove 25 as described above, it suffices to mount the housing 21 on the insertion opening 14 at the laying site of the pipe. Therefore, there is an advantage that the transportability of the pipe is not reduced and the workability of joining the joint is good.

[0020]

As described above, according to the present invention, the housing which is fitted over the socket through the socket and engages with the socket through the first lock ring is provided in the housing. Also, since the second lock ring engaging with the annular protrusion welded to the outer periphery of the insertion opening on the outside is fitted, the annular groove for accommodating the lock ring is not formed on the outer periphery of the insertion opening. A separation prevention function can be provided between the receiving and inserting openings.

[Brief description of drawings]

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

[Explanation of symbols]

 12 Receiving port 14 Inserting port 17 Collar 18 Protrusion 21 Housing 24 First annular groove 25 Second annular groove 28 First lock ring 32 Second lock ring

Claims (1)

[Claims] 1. A pipe joint for compressing an annular sealing material between an inner surface of a receiving opening and an outer surface of the receiving opening, wherein an annular projection is welded to the outer periphery of the receiving opening outside the receiving opening to open the opening of the receiving opening. A collar portion is formed on the outer periphery of the portion, and an annular housing is provided which is fitted outside from a position farther from the receiving portion than the projecting portion in the insertion opening to a receiving portion beyond the flange portion. A first annular groove is formed on the inner periphery of a position corresponding to the receiving portion beyond the brim portion, and a first lock ring engageable with the brim portion is fitted into the first annular groove. In addition, a second annular groove is formed in the inner periphery of the housing at a position farther from the receiving port than the protrusion, and the second lock is engageable with the protrusion in the second annular groove. Disengagement prevention characterized by fitting rings Stop fitting.