JP2003227592A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint coupling pipes in first and second sides, easily inserting the pipe, securely holding the pipe, facilitating maintenance, and eliminating a fear of the leakage of water. <P>SOLUTION: The pipe 6 in the first side is easily screwed in the cylinder element 2. Though the pipe 7 in the second side is inserted from a inlet side of a ring-shaped hole 11 of the cylinder element 2, constant holding force is always acted by the action of a spring 5, and the pipe 7 is smoothly and easily inserted till a bottom portion 14 of the ring-shaped hole 11 in that state. An inserting position is detected from an inspection hole 15. Maintenance can be easily carried out by removing a nut-shaped member 3 from the cylinder element 2 side. The leakage of water is certainly prevented by a seal member 16, a seal member 25 and the like. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint that belongs to a one-touch joint, and more particularly to a pipe joint that can reliably hold a pipe, can be easily attached and detached, and can be easily maintained.

[0002]

2. Description of the Related Art There are many conventional technologies relating to one-touch fittings and pipe fittings. Among them, JP-A-11-351480 is mentioned as a pipe joint relatively similar to the pipe joint of the present application. FIG. 7 is a sectional view showing the structure. This pipe joint includes a male screw portion 28 on one side of a pipe (not shown) to be screwed, a pipe receiving portion 29 with a bottom into which the other side pipe 7 is fitted, and the male screw portion 28 side. The joint body 2a forming a tapered tightening surface 30 that expands in diameter and the outer periphery of the fitted pipe 7 on the other side are attached via a seal ring 31 and the joint body 2
An inner cylinder 3a that is attached to a through a seal ring 32 and has a holding piece 34 having a tapered surface 33 that abuts and engages with a tapered tightening surface 30 on the insertion end side, and a joint body 2a.
And a coil panel 5a which is interposed between the inner cylinder 3a and the holding piece 34 of the inner cylinder 3a so as to urge the holding piece 34 in a direction in which the tapered surface 33 is pressed against the tapered tightening surface 30 side.

[0003]

The pipe joint having the above-mentioned structure has some similarities to the pipe joint of the present invention in its constituent elements, but there are many points in which the structure and effect are fundamentally different. That is, when the pipe 7 on the other side is inserted into the joint body 2a, the seal ring 31 is interposed between the pipe 7 and the inner cylinder 3a as described above.
When the pipe 7 is inserted, the inner cylinder 3a moves together with the pipe 7 in the direction of being inserted into the joint body 2a. The coil panel 5a acts in a direction to restrain this movement, but the insertion position of the pipe 7 is determined by the balance position between the pressure contact force of the seal ring 31 and the spring force of the coil panel 5a, and the insertion position becomes unstable.
For this reason, it is necessary to provide a mark for determining the insertion position on the pipe 7, which is troublesome. Furthermore, the inner circumference of the holding piece 34 of the inner cylinder 3a is shaped so as to fit into the outer circumference of the pipe 7, and the taper surface 33 of the holding piece 34 has a tapered tightening surface 30 of the joint body 2a as the pipe 7 is inserted. Moves away from. Therefore, there is a problem that the holding force of the pipe 7 becomes insufficient or unstable. Furthermore, in the case of this pipe joint, it is necessary to remove the inner cylinder 3a at the time of maintenance, and the removal work is not easy. Also, the holding piece 3
4 is formed integrally with a part of the inner cylinder 3a, and when this part is worn, it is necessary to replace the entire inner cylinder 3a, which is troublesome and costly. Further, the structure of the inner cylinder 3a itself is complicated and the cost becomes high. Further, the tapered tightening surface 30 of the joint body 2a has a structure in which the diameter increases from the opening side to the inner side, and generally such a tapered surface is not easy to process and the processing cost is high.

The present invention has been invented in view of the above circumstances. The structure is relatively simple and the cost can be reduced, and the pipe can be securely inserted to a predetermined insertion position, and at the time of insertion. An object of the present invention is to provide a pipe joint that can hold the holding force of a pipe at a predetermined value, is easy to process, and can be easily maintained.

[0005]

In order to achieve the above object, the present invention provides a ring-shaped hole with a bottom into which a pipe on the other side is fitted and a pipe on the one side. A tubular body having a female screw portion to be screwed, a nut-shaped member screwed to the outer peripheral side of the tubular body to form a tapered surface on the inner surface of which the diameter increases toward the tubular body side, and inserted into the ring-shaped hole A tapered surface that is provided in the space between the outer peripheral side of the pipe on the other side and the tapered surface of the nut-shaped member and that can abut and engage with the tapered surface is formed on the outer surface side; A ring-shaped stopper that comes into pressure contact with the outer periphery of the side pipe, and a spring that is held on the cylinder side and urges the tapered surface of the stopper toward the tapered surface of the nut-shaped member. . With the above configuration, when inserting the pipe on the other side, the stopper tries to move in the insertion direction with the insertion of the pipe, but it is returned to the original position side by the pressing force of the spring, and the pipe always has a constant insertion force. Is inserted to a predetermined position. After insertion, the tapered surface of the stopper comes into pressure contact with the tapered surface of the nut-shaped member by the pressing force of the spring, so that the pipe is stably held with a constant holding force.

The invention according to claim 2 is characterized in that a seal member, which is in pressure contact with the inner peripheral side of the other pipe, is fitted on the inner peripheral surface of the ring-shaped hole of the cylindrical body. This surely prevents leakage of water around the pipe.

Further, according to the invention of claim 3, a peep for detecting that the insertion end of the pipe on the other side is in contact with the inner bottom portion near the inner bottom portion of the ring-shaped hole of the cylindrical body. The hole is formed through. By the peephole,
The insertion position of the pipe 7 is visually detected, and the insertion position of the pipe can be ensured and stabilized without providing a mark or the like on the pipe.

According to a fourth aspect of the present invention, a seal member is provided at an engaging portion between the cylindrical body and the nut-shaped member,
Alternatively, a seal member is interposed between the nut-shaped member and the outer circumference of the pipe on the other side inserted into the ring-shaped hole. Water leakage from the pipe joint is reliably prevented by the intervention of the seal member.

According to a fifth aspect of the present invention, the stopper is made of a resin material ring body forming a cut portion at an intermediate portion thereof, and a metal piece is fitted to a portion of the stopper which is pressed against the pipe on the other side. It is characterized by being done. Due to the intermittent formation, the freedom of movement of the stopper and the holding force is improved, and a reliable pipe holding force can be obtained.

According to the invention of claim 6, the metal piece is
It is characterized in that a concave-convex portion is formed in a portion that comes into pressure contact with the pipe on the other side. By providing the metal piece having the uneven portion, the holding force of the pipe can be secured and the durability can be improved. Further, since the other portion of the stopper is made of resin, it is easy to manufacture, and the effect of being lightweight and inexpensive can be obtained.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a pipe joint of the present invention will be described below in detail with reference to the drawings. 1 is a sectional view showing an overall structure of an embodiment of a pipe joint of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIGS. 3 to 5 are detailed structures of a stopper shown in FIG. FIG.

As shown in FIG. 1, the pipe joint 1 is roughly divided into a tubular body 2, a nut-shaped member 3, a stopper 4, a spring 5 and the like. The pipe joint 1 connects the pipe 6 on one side and the pipe 7 on the other side.

The tubular body 2 has a hexagonal portion 8 on the outer peripheral side and a collar portion 9 and a collar portion 9 formed on the insertion end side of the pipe 6 of the hexagonal portion 8 and having a diameter larger than the outer diameter of the hexagonal portion 8. A hexagonal portion 8 and a male screw portion 10 extending to the opposite side are formed, and a ring-shaped hole 11 into which the other side pipe 7 is not fitted is formed inside thereof.
And a female screw portion 12 to which the pipe 6 on one side is screwed, a storage space portion 13 for storing a spring 5 described later, and the like are formed. The ring-shaped hole 11 is a hole with a bottom and forms the inner bottom portion 14. Further, a peephole 15 through which the inner bottom portion 14 can be visually observed is formed in the vicinity of the inner bottom portion 14. In addition, a seal member 16 is fitted to a portion of the inner periphery of the ring-shaped hole 11 that contacts the inner periphery of the pipe 7.

On the other hand, the nut-shaped member 3 is formed of a nut-shaped inner cylinder having a female threaded portion 17 which is screwed into the male threaded portion 10 of the tubular body 2 and a tapered surface 18 formed therein. The tapered surface 18 has a shape whose diameter increases toward the female screw portion 17 side. This nut-shaped member 3 is screwed in until its end contacts the flange portion 9 and united with the tubular body 2. In this state, a seal member 25 is interposed between the tubular body 2 and the nut-shaped member 3. Water leakage is prevented. Further, a contact surface 19 protruding inward is formed at the inner end of the tapered surface 18 of the nut-shaped member 3. As a result, the insertion position of the stopper 4 is stabilized.

Next, the structure of the stopper 4 will be described. As shown in FIG. 3, the stopper 4 is made of a ring-shaped member made of a resin material, and a part of the stopper 4 is cut by the cut portion 20. For this reason, the outer and inner diameters are elastic and elastic. The outer periphery of the nut-shaped member 3 is tapered as shown in FIG.
A tapered surface 21 that abuts and engages with 8 is formed. Further, a metal piece 23 having an uneven portion 22 is fitted on the inner peripheral side thereof. In addition, as shown in FIG. 4 and FIG.
Reference numeral 2 is a serrated shape that forms a step portion 24 that is substantially perpendicular to the direction in which the tapered surface 21 expands. Also, the metal piece 23
The inner diameter of the uneven portion 22 of the
It is formed larger than the outer circumference of the pipe in the free state, but the pipe 7
When inserting, the inner diameter shrinks, making it difficult for the outer diameter of the pipe 7 to be inserted.

As shown in FIG. 1, the spring 5 is housed in the housing space 13 of the cylindrical body 2 as described above, and abuts against one end surface of the stopper 4 as shown in the drawing. The member 3 is urged in a direction in which it is pressed against the tapered surface 18 of the strip member 3.

Next, the insertion of the pipe 6 and the pipe 7 by the pipe joint 1 having the above structure will be described. The pipe 6 on one side is easily connected by screwing the threaded portion thereof into the female threaded portion 12 of the tubular body 2. On the other hand, the pipe 7 on the other side is inserted from the side of the nut-shaped member 3. The pipe 7 is first inserted from the inlet side of the ring-shaped hole 11 of the tubular body 2, but contacts the seal member 16 and advances toward the inside of the ring-shaped hole 11 while receiving some resistance. At this time, the outer periphery of the pipe 7 hits the uneven portion 22 of the metal piece 23 of the stopper 4, and the metal piece 23
Is moved toward the inner side to move the tapered surface 21 in a direction away from the tapered surface 18 of the nut-shaped member 3. However, since the stopper 4 is pressed in the opposite direction by the spring 5, as a result, the stopper 4 is pressed.
Does not move, and the tapered surface 18 and the tapered surface 21 are held in contact with each other with a constant pressing force. From the above, the pipe 7
Is smoothly inserted into the ring-shaped hole 11 under a constant resistance force, and is surely inserted until its insertion end abuts on the inner bottom portion 14. Therefore, unlike the prior art, there is no need for a mark or the like for the insertion position. The inserted state is easily and surely detected by the peephole 15. As described above, the pipe 7 is easily inserted and the stopper 4
Since it receives a constant pressing force due to, it is securely held at the insertion position, and is prevented from coming off by the uneven portion 22 and the like. While the pipe 7 is inserted, the inner peripheral side of the pipe 7 is sealed by the seal member 16, and the seal member 25 is interposed between the tubular body 2 and the nut-shaped member 3 to prevent water leakage. Certainly prevented.

As described above, the pipe 7 cannot be easily pulled out from the insertion position and can be securely held.
However, by removing the nut-shaped member 3 from the tubular body 2, not only the pipe 7, but also the internal stopper 4 and spring 5 can be easily taken out. Therefore, these maintenances are extremely easy to perform. In this respect, the pipe joint shown in FIG. 7 of the prior art described above is significantly different.

FIG. 6 is a pipe joint 1 according to another embodiment of the present invention.
a is shown. This pipe joint 1a is intended to reduce the size of the pipe joint 1 and is not provided with a peephole 15 as shown in the drawing. Further, as another structural difference, the seal member 26 is not provided between the nut-shaped member 3 and the outer periphery of the pipe 7, and the seal member 26 is provided at the threaded portion between the nut-shaped member 3 and the tubular body 2. It is provided. In the case of this pipe joint 1a, the seal member 16 provided between the inner periphery of the pipe 7 and the inner periphery of the ring-shaped hole 11 of the tubular body 2 may be omitted. With the structure described above, the pipe 7 can be inserted and fixed to a predetermined position and securely held without the peep hole 15. In addition, water leakage can be reliably prevented.

As described above, according to the pipe joints 1 and 1a of the present invention, the pipes 6 and 7 can be connected and inserted easily and surely, and the pipes 7 and 7 can be surely held to prevent water leakage. In addition, the effect that the maintenance is easy can be achieved. Also, the entire structure can be compactly integrated.
Further, it can be implemented at a lower cost than the conventional one.

Although the structure of the pipe joints 1 and 1a has been described above, the present invention is not limited to the above contents, and it goes without saying that known techniques belonging to the same technical scope are applied.

[0022]

According to the pipe joint of the first aspect of the present invention, the other side pipe can be easily and surely inserted,
Even if there is no mark or the like, it can be securely inserted to a predetermined position. Further, in this state, a sufficient holding force can be obtained and the retainer is prevented. Further, there is no fear of water leakage, and maintenance can be easily performed. 2) According to the pipe joint of the second aspect of the present invention, reliable water leakage prevention is performed. 3) According to the pipe joint of the third aspect of the present invention, by forming the peep hole, the insertion position can be visually detected and reliable insertion can be performed. 4) According to the pipe joint of the fourth aspect of the present invention, more reliable water leakage prevention can be achieved by the intervention of the seal member. 5) According to the pipe joint of the fifth aspect of the present invention, since the cut portion is provided, the holding force of the stopper is variable, and as a result, a reliable holding force can be generated. 6) According to the pipe joint of the sixth aspect of the present invention, by using the metal piece having the uneven portion, it is possible to ensure the holding force and improve the durability. In addition, the stopper is made of a resin material except for the metal piece, so that the weight can be reduced as a whole and can be implemented at low cost.

[Brief description of drawings]

FIG. 1 is an axial sectional view showing an overall structure of an embodiment of a pipe joint of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a plan view of a stopper used in the pipe joint of the present invention.

FIG. 4 is a sectional view taken along line BB of FIG.

5 is an enlarged partial cross-sectional view showing the detailed structure of a portion around the metal piece of the stopper of FIGS. 3 and 4. FIG.

FIG. 6 is an axial sectional view showing the overall structure of another embodiment of the pipe joint of the present invention.

FIG. 7 is an axial cross-sectional view showing the overall structure of a conventional known pipe joint.

[Explanation of symbols]

1 Pipe fitting 1a Pipe fitting 2 cylinders 3 Nut-shaped member 4 stopper 5 springs 6 pipes 7 pipes 8 Hexagonal part 9 collar part 10 Male thread 11 Ring hole 12 Female thread 13 Storage space 14 Deep part 15 peep holes 16 Seal member 17 Female thread 18 Tapered surface 19 Contact surface 20 cut section 21 Tapered surface 22 Uneven shape part 23 metal pieces 24 steps 25 Seal member 26 Seal member

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3J106 AA01 BA01 BB01 BC04 BD01                       EA03 EB02 EB05 EC04 EC07                       ED08 ED12 ED15 ED42 ED43                       EE04 EE13 EE15

Claims (6)

[Claims] 1. A tubular body having a ring-shaped hole with a bottom into which a pipe on the other side is fitted, and an internal thread portion on which the pipe on one side is screwed, and an inner surface screwed on the outer peripheral side of the tubular body. A nut-shaped member that forms a tapered surface that expands in diameter toward the tubular body, and a space between the outer peripheral side of the other side pipe inserted into the ring-shaped hole and the tapered surface of the nut-shaped member. A ring-shaped stopper, which is provided inside and has a tapered surface capable of abutting and engaging with the tapered surface on the outer surface side and is in pressure contact with the outer circumference of the pipe on the other side, and a taper of the stopper held on the cylindrical body side. And a spring for urging a surface of the nut-shaped member to press the tapered surface of the nut-shaped member. 2. The pipe joint according to claim 1, wherein a seal member that is in pressure contact with the inner peripheral side of the other pipe is fitted on the inner peripheral surface of the ring-shaped hole of the cylindrical body. . 3. A peep hole for detecting that the insertion end of the other pipe is in contact with the inner bottom portion is formed in the vicinity of the inner bottom portion of the ring-shaped hole of the cylindrical body. The pipe joint according to claim 1 or 2. 4. A seal member is provided at an engaging portion between the tubular body and the nut-shaped member, or between the nut-shaped member and the outer circumference of the pipe on the other side inserted into the ring-shaped hole. The pipe joint according to claim 1, wherein a seal member is interposed therebetween. 5. The stopper is made of a resin ring body forming a cut portion at an intermediate portion thereof, and a metal piece is fitted to a portion of the stopper which is pressed against the pipe on the other side. The pipe joint according to claim 1. 6. The pipe joint according to claim 5, wherein the metal piece has a concave-convex portion formed in a portion that comes into pressure contact with the pipe on the other side.