JP3159898B2 - Captive fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art FIGS. 6 and 7 show examples of such a detachment preventing pipe joint. That is, 50
Is a pipe joint that inserts the insertion port 51 into the reception port 52 and compresses the annular sealing material 53 between the inner surface of the reception port 52 and the outer surface of the insertion port 51. An annular convex portion 54 is provided by welding on the outer periphery of the insertion opening 51 outside the receiving opening 52, and a flange portion 55 is formed on the outer periphery of the opening of the receiving opening 52. An annular housing 56 is provided which is fitted over a receiving portion of the mouth 51 that is farther from the receiving portion 52 than the convex portion 54 and beyond the flange portion 55.

The housing 56 is formed with an engaging projection 57 projecting in the inner diameter direction and capable of engaging with one end surface 54a of the projection 54 over the entire circumference. An annular groove 58 is formed on the inner periphery of the housing 56 at a position corresponding to a receiving portion beyond the collar 55. A lock ring 59 engageable with the flange 55 is fitted in the annular groove 58, and the housing 56 is provided with a plurality of set bolts 60 for pressing the lock ring 59 in the inner diameter direction. .

[0004]

However, in the above-mentioned conventional type, when the housing 54 is welded to the insertion port 51 and then the housing 56 is fitted from the end of the insertion port 51 to set it, it is difficult to set The housing 56 could not be mounted because the inner diameter A of the projection 57 was smaller than the outer diameter B of the projection 54. Therefore, as a manufacturing procedure, in the factory, the projection 54
It was necessary to fit the housing 56 into the insertion opening 51 beforehand before welding to the hole. Therefore, as shown in FIG. 7, the pipe must be transported from the factory to the laying site with the housing 56 mounted, and there is a problem that the transport efficiency is deteriorated.

Accordingly, an object of the present invention is to mount a housing at a laying site or the like after welding a convex portion at a factory or the like.

[0006]

In order to achieve the above-mentioned object, according to the first aspect of the present invention, an insertion opening is inserted into a receiving opening, and an inner surface of the receiving opening and an outer surface of the inserting opening are formed. In the pipe joint for compressing the annular seal material between, the annular convex portion is provided on the outer periphery of the insertion port outside the receiving port, and a flange portion is formed on the outer circumference of the opening of the receiving port. An annular housing that is fitted over a receiving portion beyond the collar portion from a position farther from the receiving portion than the convex portion is provided, and a receiving portion of the housing that exceeds the collar portion in the housing,
An engaging means capable of engaging in the pipe axis direction is provided on the collar portion, and a lock ring having at least one portion cut in a circumferential direction is fitted between the housing and the convex portion, and an inner peripheral surface of the lock ring is provided. A recess that is engageable with an end surface opposite to the socket of the convex portion, and is formed on the housing so as to protrude in an inner diameter direction and engage with an end surface of the lock ring opposite to the socket. An engagement projection is formed, and the inner diameter of the engagement projection is larger than the outer diameter of the projection.

[0007] According to this, after a convex portion is provided at an insertion port in a factory or the like by welding or the like, a pipe is transported to a laying site, and at the laying site, the housing is fitted from the end of the insertion port. At this time, since the inner diameter of the engagement protrusion of the housing is larger than the outer diameter of the protrusion, the housing slides in the tube axis direction from the end of the insertion opening and is mounted beyond the protrusion. Thereafter, the lock ring is fitted over the insertion hole, and the concave portion of the lock ring is engaged with the convex portion. The mounting of the lock ring is easy because the lock ring has a structure cut at at least one position in the circumferential direction.

Next, the end of the insertion port is inserted into the reception port, the housing is slid toward the reception port along the axial direction of the tube, and the engagement projection is provided on the end face of the lock ring opposite to the reception port. To be engaged. Thereafter, the engaging means is engaged with the collar portion in the tube axis direction. In this way, after the projections are provided at the factory, the housing can be mounted at the installation site, etc., so that the pipes can be transported from the factory to the installation site with the housing removed, and the transport capacity at the time of transportation is improved. improves.

[0009] At the socket and the socket of the tube thus connected, the engaging projection of the housing engages with the projection of the socket via the lock ring, and the engaging means of the housing receives the socket. By engaging with the brim of the mouth, a separation preventing function is provided between the socket and the insertion opening.

[0010]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIG. As shown in FIG. 1, a socket 2 is formed at one end of a cast iron pipe 1 joined to each other, and inserted into the interior of the socket 2 at an end of the other cast iron pipe 3. The insertion hole 4 to be formed is formed. A seal material storage portion 5 is formed on the inner periphery of the receiving port 2, and the sealing material 6 stored in the sealing material receiving portion 5 is inserted into the receiving port 2 by inserting the insertion port 4 into the receiving port 2. It is configured such that a predetermined sealing function is imparted by being compressed between the outer peripheral surface of the insertion opening 4. A flange 7 is formed on the outer periphery of the opening of the receiving port 2.

An annular projection 8 having a rectangular cross section is fitted on the outer periphery of the insertion opening 4 outside the receiving opening 2 and fixed by welding. 9 is the welded portion. The projection 8 is configured to be located near the opening end face 10 of the receptacle 2 when the insertion port 4 is inserted to a predetermined position inside the receptacle 2.

[0012] From the outer peripheral portion of the receptacle 2 beyond the collar portion 7,
An annular housing 11 made of cast iron is fitted over a range from the convex portion 8 of the insertion opening 4 inserted to a predetermined position inside the reception opening 2 to an outer peripheral portion at a position further away from the reception opening 2. I have.

Between the housing 11 and the convex portion 8, a first lock ring 14, which is cut open at one location and can be freely opened and closed, and is formed so as to be tight, is fitted. At one end of the inner peripheral surface of the first lock ring 14, a concave portion 15 that can be engaged in the tube axis direction with an end surface 8a of the convex portion 8 opposite to the receiving port 2 is formed over the entire circumference, Thus, the radial cross section of the first lock ring 14 is formed in an L shape. As shown in FIG. 2, a notch 16 communicating with the recess 15 is formed in the other end of the inner peripheral surface of the first lock ring 14 in the circumferential direction. These cutouts 16 are formed at three positions of 90 °, 180 °, and 270 ° when the cutout 17 of the first lock ring 14 is 0 °.

The housing 11 has an insertion-portion-side inner peripheral surface 18 having a diameter slightly larger than that of the first lock ring 14 at a portion fitted into the insertion opening 4. An engaging projection 20 is formed on the housing 11 over its entire circumference and protrudes in the inner diameter direction and is engageable with the end face 14a of the first lock ring 14 opposite to the receiving port 2 in the tube axis direction. ing. The inner diameter A of the engagement projection 20 is formed larger than the outer diameter B of the projection 8.

Further, the flange portion 7 of the housing 11 is provided.
An engagement means 21 that can engage with the collar portion 7 in the tube axis direction is provided at the receiving portion beyond the opening. That is, the housing 11 has a receiving-port-side inner peripheral surface 22 having a diameter slightly larger than that of the flange portion 7 at a portion fitted into the receiving port 2. It comprises a second lock ring 24 housed in the groove 23 and a plurality of set bolts 25.

The annular groove 23 is formed in a rectangular cross section over the entire circumference at a position corresponding to the receiving portion beyond the flange portion 7 on the receiving-side inner peripheral surface 22. The second lock ring 24 has a rectangular cross section,
It has a split structure that can be opened and closed with one part cut off, and is formed tightly.

The set bolts 25 are arranged at a plurality of positions in the circumferential direction of the housing 11 and are screwed from the outer surface of the housing 11 toward the annular groove 23 in the radial direction of the tube. These set bolts 25 are formed with a hexagonal hole without a head, and by pressing the outer surface of the second lock ring 24 with the outer ends screwed into the housing 11,
The lock ring 24 can be maintained in a tightened state and held on the outer peripheral surface 26 of the receptacle 2. When the second lock ring 24 is thus fastened to the outer peripheral surface 26 of the socket 2, it can be engaged with both the annular groove 23 and the collar portion 7 in the tube axis direction.

The operation of the above configuration will be described below.
After the projecting portion 8 is welded to the opening 4 at the factory, the plurality of pipes 1 and 3 are collectively transported to the laying site, and at the laying site, as shown in FIG. The housing 11 is fitted into the annular groove 23 and the housing 11 is fitted over the end of the insertion opening 4. At this time, since the inner diameter A of the engagement projection 20 of the housing 11 is larger than the outer diameter B of the projection 8, the housing 11 is moved from the end of the insertion port 4 in the pipe axis direction as shown by the phantom line in FIG. To slide over the convex portion 8.

After that, as shown in FIG. 4, the first lock ring 14 is fitted from the end of the insertion opening 4 and slid in the tube axis direction, and the cut portion 17 is opened so that the first lock ring 14 is The convex portion 8 is overcome by expanding the diameter, and the concave portion 15 of the first lock ring 14 is engaged with the convex portion 8 as shown by a virtual line in FIG. Next, the end of the insertion port 4 is inserted into the reception port 2, and the housing 11 is slid along the pipe axis direction toward the reception port 2 (in the direction indicated by the arrow A in FIG. 4), and the engagement protrusion is formed. 20 is engaged with the end face 14 a of the first lock ring 14 on the side opposite to the socket 2. Thereafter, as shown in FIG. 1, the set bolt 25 is screwed in, and the second lock ring 24 is pressed in the inner diameter direction to engage with the collar portion 7. As described above, since the housing 11 can be mounted on the laying site after welding the projections 8 at the factory, the plurality of pipes 1 and 3 can be collectively transported from the factory to the laying site with the housing 11 removed. It is sufficient, and the carrying capacity at the time of carrying is improved.

As shown in FIG. 1, the housing 4 is provided between the insertion port 4 and the receiving port 2 of the tubes 1 and 3 thus connected.
The engagement projection 20 of the insertion hole 4 is inserted through the first lock ring 14.
And the annular groove 23 of the housing 11.
The engagement of the second lock ring 24 fitted to the flange 7 of the socket 2 provides a separation preventing function between the socket 2 and the insertion port 4.

As shown in FIG. 2, a plurality of notches 16 are formed on the inner peripheral surface of the first lock ring 14,
Since the force in the tightening direction is weakened at the notch 16, the first lock ring 14 can be easily opened from the cut 17.

In the above embodiment, as shown in FIG.
Although the first lock ring 14 has a split structure, it may have a split structure or a plurality of split structures. In the case of a multiple division structure, the first division as shown in FIG.
It is not necessary to pass the lock ring 14 from the end of the insertion opening 4 to get over the convex portion 8, and each of the divided pieces of the first lock ring 14 is externally fitted to the convex portion 8 directly from the outer periphery. It should be done.

Hereinafter, another embodiment of the present invention will be described with reference to FIG. That is, a tapered surface that is inclined toward the outer periphery as the outer peripheral surface of the first lock ring 14 approaches the socket 2.
40. The first having the tapered surface 40
The maximum outer diameter of the lock ring 14 is formed to be the same as the outer diameter of the collar portion 7 of the receiving port 2, so that the tapered surface 40 and the outer peripheral surface of the collar portion 7 are continuous without any step. Further, corresponding to the tapered surface 40, the inner peripheral surface 18 on the insertion side of the housing 11 is formed.
Are formed on a tapered surface slightly larger in diameter than the first lock ring 14.

According to this, at the laying site, the second lock ring 24 is fitted into the annular groove 23, and the housing 11 is fitted from the end of the insertion opening 4 and slid in the pipe axis direction, and the phantom line shown in FIG. As shown in FIG. After that, the first lock ring 14 is engaged with the projection 8. Next, the end of the insertion opening 4 is inserted into the reception opening 2, and the housing
11 is slid along the pipe axis direction toward the receiving port 2 (in the direction indicated by the arrow B in FIG. 5), and the engaging projection 20 is brought into contact with the end face of the first lock ring 14 on the side opposite to the receiving port 2. 14a.

At this time, the second lock ring 24 is guided by the tapered surface 40 of the first lock ring 14 and is easily opened in the pipe diameter direction. Further, the tapered surface of the first lock ring 14
The second lock ring 24 smoothly transitions from the tapered surface 40 of the first lock ring 14 to the outer peripheral surface of the collar 7 because the 40 and the outer peripheral surface of the collar 7 are continuous without any step. Accordingly, the joining operation between the insertion opening 4 and the receiving opening 2 can be easily performed.
Thereafter, the second lock ring 24 may be pressed in the inner diameter direction by engaging the set bolt 25 and engaged with the collar portion 7.

[0026]

As described above, according to the first aspect of the present invention, after a projection is provided at an insertion port by welding or the like in a factory or the like, a pipe is transported to a laying site, and the laying site is installed. In, the housing is fitted from the end of the insertion opening.
At this time, since the inner diameter of the engagement protrusion of the housing is larger than the outer diameter of the protrusion, the housing slides in the tube axis direction from the end of the insertion opening and is mounted beyond the protrusion. Thereafter, the lock ring is fitted over the insertion hole, and the concave portion of the lock ring is engaged with the convex portion.

Next, the end of the insertion port is inserted into the reception port, the housing is slid toward the reception port along the axial direction of the pipe, and the engaging projection is provided on the end face of the lock ring opposite to the reception port. To be engaged. Thereafter, the engaging means is engaged with the collar portion in the tube axis direction. In this way, after the projections are provided at the factory, the housing can be mounted at the installation site, etc., so that the pipes can be transported from the factory to the installation site with the housing removed, and the transport capacity at the time of transportation is improved. improves.

[Brief description of the drawings]

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

FIG. 2 is a front view of a lock ring.

FIG. 3 is a cross-sectional view illustrating a procedure for joining an insertion port and a reception port at a laying site.

FIG. 4 is a cross-sectional view illustrating a procedure for joining an insertion port and a reception port at a laying site.

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

FIG. 6 is a cross-sectional view of a conventional separation prevention pipe joint.

FIG. 7 is a cross-sectional view showing a state of a pipe conveyed from a factory to a laying site in a conventional separation-preventing pipe joint.

[Explanation of symbols]

 2 Receiving Port 4 Insertion Port 6 Sealing Material 7 Collar 8 Convex 8a End 11 Housing 14 First Lock Ring 14a End 15 Recess 20 Engagement Projection 21 Engagement Means A Inner Diameter of Engagement Projection B Diameter

Continuation of the front page (56) References Japanese Utility Model 5-12885 (JP, U) Japanese Utility Model 58-138884 (JP, U) Japanese Utility Model 63-74588 (JP, U) Japanese Utility Model 50-50218 (JP) , U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16L 21/00-21/08

Claims (1)

(57) [Claims] In a pipe joint for inserting an insertion port into a receiving port and compressing an annular sealing material between an inner surface of the receiving port and an outer surface of the receiving port, a ring is formed on an outer periphery of the receiving port outside the receiving port. The convex portion is provided, a flange portion is formed on the outer periphery of the opening of the receiving port, and the outer fitting is fitted over the receiving portion beyond the flange portion from a position farther from the receiving portion than the convex portion in the insertion opening. An annular housing is provided, and a receiving portion of the housing beyond the collar portion is provided with engaging means capable of engaging with the collar portion in the pipe axis direction, and a circumferential portion is provided between the housing and the convex portion. A lock ring cut in at least one position in the direction is fitted therein, and a concave portion engageable with an end surface of the lock ring opposite to a receiving port of the convex portion is formed on the inner peripheral surface. Projecting in the direction and engaging with the end face of the lock ring opposite to the socket A detachable pipe joint, wherein a possible engagement protrusion is formed, and an inner diameter of the engagement protrusion is larger than an outer diameter of the protrusion.