JP2000320753A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint capable of latching a coming-off prevention tool at a fixed position of an insertion port at all times without scratching an outer peripheral face of the insertion port and allowing easy confirmation of the completion of connection. SOLUTION: A groove 4 for seal ring from an opening part 9 side and a groove 5 for coming-off prevention ring by separating it on an innermost side from the groove 4 are provided on an inner peripheral face of a receiving port 3 which an insertion port 2 of a pipe to be connected is inserted from an opening part 9. A seal ring 6 and a coming-off prevention ring 7 are mounted on each groove 4, 5, and a diameter expansion ring 8 having a tapered part 13 for expanding a diameter of the coming-off prevention ring 7 on an outer peripheral face of a tip part is fitted between the groove 4 for seal ring and the groove 5 for coming-off prevention ring in play.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint capable of joining pipes by inserting an insertion port into a receiving port and having a function of preventing detachment.

[0002]

2. Description of the Related Art Conventionally, various pipe joints having a function of preventing detachment have been proposed.
No. 1571. In this pipe joint, a stopper is loosely fitted in a concave portion provided on the inner peripheral surface of the receiving port, and a diameter increasing jig is attached to a notch of the stopper, and an inner diameter of the stopper is inserted. Spread it close to the outside diameter of the mouth, and insert the mouth of the tube to be connected. Then, the insertion opening is inserted into the stopper without hitting the edge of the stopper, and the inner diameter of the stopper is pushed up to the outer diameter of the insertion stopper. At the same time, the width of the notch is further widened, and the diameter increasing jig comes off from the notch, so that the stopper comes to have a structure in which the clamping force is generated to try to reduce the diameter and hooks on the outer peripheral surface of the insertion opening. I have.

[0003]

However, the pipe joint has the following problems. First, when the insertion hole is inserted, the retaining jig is pushed out and the enlarged diameter jig falls off from the expanded notch portion. There is a possibility that the pipe is pushed by the insertion port without stopping inside, enters the pipe, and flows through the pipe.

If the stopper is not attached to the outer peripheral surface of the pipe at a position at a certain distance from the end of the insertion port, the stopper will not be able to be removed from the insertion port when a force is applied to the pipe in the removal direction. After the stopper is hooked on the tube, it is necessary to push the insertion hole further into the receptacle after the stopper is hooked on the pipe. At this time, the hook provided on the inner peripheral surface of the retaining member may damage the outer peripheral surface of the insertion slot, and the retaining member may be easily removed due to the damage.

Furthermore, in the operation of pushing the insertion hole all the way into the receptacle, it is difficult to determine the completion of the connection, and there is a risk that some workers may determine that the connection is completed without the insertion of the insertion hole being insufficient. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is to always hold the stopper at a predetermined position of the insertion hole without damaging the outer peripheral surface of the insertion hole. It is an object of the present invention to provide a pipe joint that can be stopped and a connection completion can be easily confirmed.

[0006]

According to a first aspect of the present invention, a pipe joint to be connected has an insertion port (2) inserted through an opening (9). On the inner peripheral surface of the receiving port (3), a groove (4) for a seal ring and a groove (5) for a separation preventing ring (5) are provided so as to be isolated from the opening (9) side and further away from the groove (4). The respective grooves (4, 5)
Is provided with a seal ring (6) and a separation prevention ring (7), and the separation prevention ring (7) is expanded in diameter between the seal ring groove (4) and the separation prevention groove (5). A diameter-enlarged ring (8) having a tapered portion (13) on the outer peripheral surface at the distal end portion is loosely fitted.

Further, in the pipe joint according to the first aspect, the axial dimension of the end receiving port located deeper than the diameter-enlarging ring (8), the separation preventing ring (7) and the separation preventing ring groove (5) is L.
When L1, L2 and L3, the relationship of L2 <60; L1≤L3 is established.

Further, in the pipe joint according to claim 1 or 2, a tapered surface (14) having the same angle as the angle of the chamfer (12) at the end of the pipe insertion opening is formed on the inner peripheral surface of the enlarged diameter ring (8). ) Is provided.

The material of the pipe joint of the present invention may be either metal or plastic, but is preferably C-PVC or PV.
Thermoplastics such as C, PE and PP are preferred. The structure of the pipe joint may be used for any of a straight pipe, a curved pipe, and a branch pipe.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings, but it goes without saying that the present invention is not limited to the embodiments. FIG. 1 is a longitudinal sectional view showing an embodiment of a PVC pipe joint of the present invention. FIG. 2 is an exploded perspective view, FIG. 3 is a longitudinal sectional view showing another embodiment of the diameter-expanding ring shown in FIG. 1, and FIG. 4 is a pipe connection of the pipe joint shown in FIG. FIG. 5 is a longitudinal sectional view showing a state after the pipe connection of the pipe joint shown in FIG. 1 is completed.

[0011]

1 to 6, reference numeral 1 denotes a pipe joint.
Reference numeral 2 denotes an opening of a pipe to be connected. A chamfer 12 is provided at an end of the insertion opening 2. When the pipe is made of a polyolefin resin such as PE or PP, a reinforcing in-core is installed in the insertion opening 2 to increase the strength of the pipe.

Reference numeral 3 denotes a port of the pipe joint 1. The inner peripheral surface of the receiving port 3 is provided with a seal ring groove 4 from the opening 9 side and a detachment preventing ring groove 5 separated from the groove 4 to the back side. Seal ring 6 made of
The groove 5 houses a detachment preventing ring 7. The inner diameter of the detachment preventing ring 7 in the normal state is smaller than the outer diameter of the insertion opening 2, and a cutout portion 16 having a fixed width is provided so that it can be expanded and contracted (see FIG. 2). The inner diameter of 5 is formed larger than the outer diameter when the separation prevention ring 7 is expanded.

A plurality of hooks 11 are provided on the inner peripheral surface of the separation preventing ring 7 in a saw-tooth shape. The shape of the hook portion 11 is not limited to the illustrated shape, and may be any shape as long as the shape is such that the hook portion 11 is strongly engaged with the outer peripheral surface of the insertion tube and is hooked. The detachment prevention ring 7 is made of a metal such as iron, copper, aluminum, and stainless steel.
It is preferable to use a resin-coated one.
Further, plastic may be used as long as the function as the ring for preventing separation is satisfied.

An enlarged diameter ring 8 is loosely fitted between the seal ring groove 4 and the separation preventing groove 5. The enlarged diameter ring 8 has a tapered portion 13 on the outer peripheral surface of the distal end portion for increasing the diameter of the separation preventing ring 7, and the diameter of the tapered end of the tapered portion 13 is equal to the diameter of the separation preventing ring 7. It is formed smaller than the inner diameter, and the diameter of the detachment prevention ring 7 can be increased by the tapered portion 13 by pushing the enlarged diameter ring 8 deep into the receiving port. On the other hand, the inner diameter of the end of the enlarged diameter ring 8 on the opening 9 side is formed larger than the outer diameter of the insertion opening 2, so that the insertion end 10 can be fitted without hitting the edge of the enlarged diameter ring 8. ing.

At the tapered distal end of the inner peripheral surface of the diameter-enlarged ring 8, a push portion 15 is provided which comes into contact with the inserted distal end 10 of the insertion opening. Further, a tapered portion 14 is provided on the inner peripheral surface of the diameter-expanding ring 8, and the angle of the tapered portion 14 is formed to be the same as the angle of the chamfer 12 of the insertion opening 2. Since the angle of the chamfer of the insertion opening 2 is usually 15 degrees, if the angle of the tapered portion 14 is also set to 15 degrees, the axes of the insertion opening 2, the expanding ring 8, and the separation preventing ring 7 can be easily adjusted. Therefore, fitting at the time of connection can be performed smoothly.

As shown in FIG. 3, the diameter-expanding ring 8 may have a tapered shape as a whole. Further, the enlarged diameter ring 8 may be provided with a cutout portion for cutting off the circumference. The material of the expanding ring 8 is iron,
Metals such as copper, aluminum, stainless steel, C-PVC, P
Plastics such as VC, PE, PP, PC, PPS,
Glass reinforced fiber plastics and the like are preferred.

Next, an axial width L1 of the diameter-enlarging ring 8 in FIG. 1, an axial width L2 of the locking ring 7, and an axial width from the locking ring groove 5 to an end receiving port. The relationship between the three members of the dimension L3 will be described. L
The configuration is such that L2 <60; L1≤L3 is established between 1, L2, and L3. The reason will be described below.

After inserting the insertion tip 10 to the terminal receptacle,
L1 ≦ L3 is set so that the separation prevention ring 7 comes off the diameter-enlarging ring 8 and is hooked on the outer peripheral surface of the pipe insertion opening 2. L1 represents the approximate dimensions from the insertion end 10 to the position where the separation prevention ring 7 is engaged as described above, and the setting of L1 allows the engagement position of the separation prevention ring 7 to be freely adjusted, and the position is almost fixed. The retaining ring 7 can be hooked on the arm. Naturally, since L2 < L1 must be satisfied, the outer peripheral surface of the insertion opening 2 is engaged with the hooking portion 11 of the locking ring 7 until the expanding ring 8 passes the position of the locking ring 7.
And can be inserted without being damaged. Furthermore, since the insertion is completed when the detachment prevention ring 7 comes off the diameter expanding ring 8, the completion of the connection can be sensed by the sound or feel when the detachment prevention ring 7 is hooked on the insertion opening 2.

Next, the operation of this embodiment will be described with reference to FIGS. 1, 4 and 5. Now, when the insertion port 2 of the pipe is inserted into the receiving port 3 from the opening 9 in the state of FIG. 1, the insertion port 2 penetrates through the seal ring 6 and fits into the diameter-enlarged ring 8. The insertion tip 10 comes into contact with the pressing portion 15 of the diameter-enlarging ring 8. When the insertion opening 2 is further pushed in, the insertion end 10 presses the pressing portion 15 of the enlarged diameter ring 8, and the insertion opening 2 moves to the back side of the receptacle while being fitted to the enlarged diameter ring 8, and the enlarged diameter ring 8 is moved. The tapered portion 13 of FIG. 4 gradually expands the inner circumference of the separation prevention ring 7 to reach the state shown in FIG. At this time, the locking portion 1 of the separation prevention ring 7
Since 1 is in contact with the outer peripheral surface of the diameter-enlarged ring 8, the outer peripheral surface of the insertion opening 2 is not damaged by the hook portion 11.

When the insertion port 2 is further inserted from the state shown in FIG. 4 and the insertion tip 10 moves to the terminal receiving port, the expanding ring 8 passes through the separation preventing ring 7, while the expanding ring 8
The detachment prevention ring 7 that has come off is caused to tighten, trying to reduce the diameter, and the engaging portion 11 provided on the inner surface of the detachment prevention ring 7 is engaged with the outer peripheral surface of the insertion opening, resulting in the state of FIG. In this state, if a force in the detachment direction acts during use, the detachment prevention ring side surface 18 and the side surface 17 of the detachment prevention ring groove 5 come into contact with each other, and the movement of the insertion opening 2 in the detachment direction is stopped. A separation preventing function is provided between the insertion openings 2. The expanded ring 8 after the connection is held in a space 19 surrounded by the inner periphery of the receiving port and the outer periphery of the receiving port on the back side of the receiving port.

FIG. 6 is a longitudinal sectional view showing another embodiment of the pipe joint according to the present invention. In this fitting, on the inner peripheral surface of the receiving port,
A groove 5 for a separation prevention ring having a tapered surface that is gradually reduced in diameter from the back side of the receiving port to the opening side is provided.
A detachment prevention ring 7 whose outer peripheral surface is tapered is accommodated therein. When the separation prevention ring 7 moves in the direction in which the separation prevention ring 7 is removed together with the insertion tube when the pipe joint is used, the diameter of the separation prevention ring 7 is reduced. The operation in this case is the same as in the above-described embodiment, and will not be described.

[0022]

Since the pipe joint of the present invention is constructed as described above, it has the following excellent effects. (1) When the tube is inserted, the tube is not damaged by the hooking portion of the separation prevention ring, so that the insertion hole is difficult to come off. (2) The position of the separation prevention ring hooked on the pipe insertion opening can be easily adjusted by changing the axial dimension of the enlarged diameter ring. In addition, the locking ring can always be hooked at the fixed position of the insertion opening, and anyone can easily confirm that the connection is completed by the sound or feel of the locking of the locking ring. (3) The structure is simple, the connection to the pipe can be easily made, and the workability and workability at the site are excellent.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a pipe joint according to the present invention.

FIG. 2 is an exploded perspective view of the pipe joint of FIG.

FIG. 3 is a longitudinal sectional view showing another embodiment of the diameter expanding ring.

FIG. 4 is a vertical cross-sectional view showing a state of the pipe joint according to the present invention during pipe connection.

FIG. 5 is a longitudinal sectional view showing a state after completion of pipe connection of the pipe joint according to the present invention.

FIG. 6 is a longitudinal sectional view showing another embodiment of the pipe joint according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fitting 2 Insertion opening 3 Reception opening 4 Seal ring groove 5 Separation prevention ring groove 6 Seal ring 7 Separation prevention ring 8 Expanding ring 9 Opening 10 Insertion tip 11 Hooking section 12 Chamfer 13 Taper section (outer circumference) 14 Tapered portion (inner circumference) 15 Push portion 16 Notch portion 17 Side surface 18 Side surface 19 Space

Claims (3)

[Claims] An opening (2) for a pipe to be connected is formed on an inner peripheral surface of a receiving port (3) inserted through an opening (9) from a side of the opening (9). 4) and a groove (5) for an anti-separation ring is provided at a position deeper than the groove (4), and a seal ring (6) and an anti-separation ring (7) are provided in each of the grooves (4, 5). A taper portion (13) is provided between the seal ring groove (4) and the separation preventing groove (5) to expand the diameter of the separation preventing ring (7).
Characterized in that a large-diameter ring (8) having an outer peripheral surface at a distal end portion is loosely fitted. 2. An expanding ring (8) and a separation preventing ring (7).
And when the axial dimension of the end receiving port located deeper than the retaining ring groove (5) is L1, L2 and L3, respectively,
2. The pipe joint according to claim 1, wherein a relationship of 2 < L1≤L3 is satisfied. 3. A tapered surface (1) having the same angle as the angle of the chamfer (12) at the end of the pipe insertion end on the inner peripheral surface of the diameter-enlarging ring (8).
The pipe joint according to claim 1 or 2, wherein (4) is provided.