JP4133002B2 - Pipe fitting - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe joint in which a pipe body can be easily attached and detached, and more particularly, to a pipe joint having improved reliability when the pipe body is attached and detached.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, pipe joints that can be easily attached and detached from a pipe body have been widely used. FIG. 5 is a half cross-sectional view showing such a conventional pipe joint, and includes a release ring 3 capable of moving back and forth and a lock ring 1 capable of expanding and contracting in order from the pipe insertion port side of the joint body 10. Has been placed.
[0003]
In order to mount the pipe body 20 in the conventional pipe joint shown in FIG. 5, the pipe body 20 may be simply inserted into the joint body 10. Then, the tube body 20 passes through the inside of the release ring 3 and stops in contact with the V-shaped lock ring 1 or the release ring 3 moves to the back side as the tube body 20 is inserted. Comes into contact with the V-shaped lock ring 1 and stops. When the tubular body 20 is further inserted, since the V-shaped opening of the lock ring 1 is arranged toward the deep side of the joint body 10, the outer surface of the tubular body 20 spreads the inner periphery of the lock ring 1. Finally, it passes through the seal ring 4 and reaches the innermost part of the joint body 10.
[0004]
When the internal pressure is applied in this state, the tube body 20 receives a force in a direction away from the joint body 10, but as a result of the inner peripheral end of the lock ring 1 biting into the outer surface of the tube body 20, separation of the tube body 20 is prevented. It is. On the other hand, the release ring 3 may be pushed in to detach the tube body 20. Then, as a result of the distal end of the release ring 3 expanding the lock ring 1, the lock ring 1 is released from the outer surface of the tube body 20, and the tube body 20 can be pulled out.
[0005]
[Problems to be solved by the invention]
As described above, when the tube body 20 is detached, the lock ring 1 is pushed and spread at the tip of the release ring 3 to release the lock ring 1 from being bitten into the outer surface of the tube body 20. The lock ring 1 is not positioned away from the tube body 20. Therefore, as shown in FIG. 6A, when the tubular body 20 is detached, the lock ring 1 is pulled out with the inner peripheral end in contact with the outer surface of the tubular body 20, and the outer surface of the tubular body 20 is shaved. There was a thing. Further, after the tube body 20 is mounted, when the internal pressure is applied and the V-shaped opening is deformed so as to face the outer surface of the tube body 20 as shown in FIG. There was a risk of inadvertent withdrawal. Furthermore, when the tubular body 20 is mounted, as shown in FIG. 6C, when the distal end of the tubular body 20 comes into contact with the wall surface of the joint body 10 on the back side of the lock ring 1, the tubular body 20. There is a risk that the worker will have the illusion that he has reached the innermost part, which is a cause of insufficient insertion.
[0006]
Therefore, the present invention does not pose a risk of damaging the surface of the tubular body when the tubular body is detached, can prevent the tubular body from being inadvertently detached, and can prevent work mistakes such as insufficient insertion when the tubular body is installed. It aims at providing the pipe joint which can be performed.
[0007]
[Means for Solving the Problems]
The present invention has been made to solve the above problems, and the gist of the present invention is to have a lock ring having a V-shaped cross section, and to lock the V-shaped opening toward the deep side of the joint body. It is a pipe joint that prevents the pipe from being detached by placing the ring in the pipe insertion port. The stabilization ring is installed inside the V-shaped opening of the lock ring , and the cross section of the stabilization ring is trapezoidal. There is a pipe joint in which a stabilization ring is installed so that the lower base of the trapezoid is directed to the deep side of the joint body .
[0008]
Here, the stabilization ring may be a new member separate from the joint body, or may be a protrusion integral with the joint body . In this case , there is a gap between the lower base in the trapezoidal section of the stabilization ring and the tip of the outer hypotenuse in the V-shaped section of the lock ring, and the inner hypotenuse in the trapezoidal section of the stabilization ring, and the lock ring It is preferable that there is a space between the inner hypotenuse in the V-shaped cross section.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The pipe joint of the present invention has a lock ring having a V-shaped cross section, and the lock ring is disposed in the tube insertion port so that the V-shaped opening is directed to the deep side of the joint body. Therefore, when the tubular body is inserted into the joint body, the distal end of the tubular body expands the diameter of the lock ring, and the distal end of the tubular body can be easily inserted deeper than the lock ring. When the internal pressure is applied and the tube body receives a force in a direction away from the joint body, the inner peripheral end of the lock ring bites into the outer surface of the tube body, thereby preventing the tube body from being detached. In this respect, the pipe joint of the present invention is similar to the conventional one, and the mounting is completed simply by inserting the pipe body into the joint body.
[0010]
As described above, the pipe joint of the present invention is characterized in that the stabilization ring is installed inside the V-shaped opening of the lock ring while maintaining the ease of mounting. This stabilization ring is designed to prevent the deformation when the internal pressure is applied by allowing the lock ring to move away from the tube when the tube is detached. That is, in the pipe joint of the present invention, the shape and position of the lock ring are held by the stabilization ring, so that the lock ring is moderately restrained, so that the lock ring is separated from the pipe body and deformation is also prevented. .
[0011]
Here, the stabilization ring should just exist in the inside of the V-shaped opening part of a lock ring, for example, installing a new member separate from a coupling main body inside a lock ring is considered. . Further, a protrusion can be integrally formed on the wall surface of the joint main body on the opening side of the lock ring, and the protrusion can be used as a stabilization ring.
[0012]
Moreover, the cross-sectional shape of the stabilization ring is a trapezoidal shape corresponding to a V-shaped lock ring . In this case, the bottom of the trapezoid is installed so as to face the deeper side of the joint body so that the trapezoid of the stabilization ring is accommodated inside the V-shape of the lock ring.
[0013]
The tip of the stabilizing ring (the trapezoidal upper bottom side) is the inner surface of the lock ring so that the lock ring shape and position are properly maintained and the diameter of the lock ring is not hindered when the tube is mounted. However, it is preferable that the rear end of the stabilization ring (the lower bottom side of the trapezoid) is not in contact with the inner surface of the lock ring. That is, there is a gap between the lower base in the trapezoidal section of the stabilization ring and the tip of the outer hypotenuse on the V-shaped section of the lock ring, and the inner hypotenuse in the trapezoidal section of the stabilization ring and the lock ring There is a space between the inner hypotenuse in the V-shaped cross section.
[0014]
Furthermore, the pipe joint of the present invention can be provided with a release ring for detaching the pipe body. In this case, a release ring that can be moved back and forth from the pipe insertion port side of the joint body, and a lock that can be expanded and contracted. Place the ring and the stabilizing ring fixed to the joint body in this order.
[0015]
【Example】
Hereinafter, the best embodiment of the pipe joint of the present invention will be described with reference to the drawings. FIG. 1 is a half sectional view showing an example of a pipe joint of the present invention, and shows a state where a pipe body 20 is mounted on a joint body 10. The joint body 10 of the embodiment shown in FIG. 1 is made of gunmetal, and the innermost wall surface 10 </ b> A serves as a stopper for the tube body 20.
[0016]
A synthetic resin release ring 3 is inserted into the joint body 10 at the insertion port side of the tube body 20 so as to be movable back and forth, and cannot be removed from the joint body 10 by the sleeve 11 fitted to the outer surface of the joint body 10. It is like that. Further, a stainless steel lock ring 1 is inserted into the joint main body 10 on the back side of the release ring 3. Since this lock ring 1 has a V-shaped cross section and has elasticity, it can be expanded and contracted. Further, a stabilization ring 2 made of brass is installed inside the V-shaped opening of the lock ring 1. Note that an O-ring made of EPDM is also provided as the seal ring 4.
[0017]
FIG. 2 is a perspective view showing a stabilizing ring used in the pipe joint of the embodiment shown in FIG. As shown in FIG. 2, the stabilizing ring is a ring member having a trapezoidal cross section. FIG. 3 is an enlarged cross-sectional view showing the periphery of the lock ring and the stabilization ring in the pipe joint of the embodiment shown in FIG. As shown in FIG. 3 (A), the lock ring 1 is arranged so that the V-shaped opening is directed to the deep side of the joint body 10, and the stabilization ring 2 has the trapezoidal bottom at the deep side of the joint body 10. It is installed to face. The stabilization ring 2 has a trapezoidal lower base fixed to the wall surface 10 </ b> B of the joint body 10, and the trapezoidal upper base is located in the opening of the lock ring 1.
[0018]
Next, the effect | action of the stabilization ring in the pipe joint of this invention is demonstrated. That is, when the tubular body 20 is detached from the mounted state shown in FIG. 1, the diameter of the lock ring 1 is increased by pushing the release ring 3 into the deep side from the tubular body insertion port side of the joint body 10.
[0019]
At this time, in the pipe joint of the present invention, as shown in FIG. 3A, the tip of the release ring 3 pushes the inner hypotenuse 1A of the V-shaped lock ring 1 and at the same time the outer hypotenuse of the lock ring 1 1B rides on the outer hypotenuse 2B of the trapezoidal stabilization ring 2. Then, even after the release of the lock ring 1 with respect to the outer surface of the tubular body 20 by the release ring 3, the lock ring 1 remains on the hypotenuse 2 </ b> B of the stabilization ring 2 and has a diameter expanded. Accordingly, the state in which the tip of the oblique side 1A of the lock ring 1 is kept away from the outer surface of the tube body 20 can be removed without damaging the outer surface of the tube body 20 by pulling out the tube body 20 in this state. It can be done. In this respect, the effect of the stabilization ring 2 becomes more apparent when compared with FIG. 6A in the case of the conventional example without the stabilization ring.
[0020]
In addition, between the lower base 2C in the trapezoidal section of the stabilization ring 2 and the tip 1C of the outer hypotenuse 1B in the V-shaped section of the lock ring 1 so that the inner hypotenuse 1A of the lock ring 1 can be easily expanded in diameter. And a space S is formed between the inner hypotenuse 2A in the trapezoidal cross section of the stabilization ring 2 and the inner hypotenuse 1A in the V-shaped cross section of the lock ring 1. However, the tip of the inner hypotenuse 1A in the V-shaped cross section of the lock ring 1 may extend deeper than the lower base 2C in the trapezoidal cross section of the stabilization ring 2.
[0021]
Further, when an internal pressure is applied in the mounted state shown in FIG. 1, a force in a direction away from the joint body 10 is applied to the tube body 20. Therefore, a force in the direction of turning up the inner hypotenuse 1A is also applied to the lock ring 1 which is hard to the outer surface of the tube body 20. At this time, in the case of the conventional example without the stabilizing ring, as shown in FIG. 6B, the V-shaped opening is deformed so as to face the outer surface of the tubular body 20, and the tubular body 20 is not prepared. It will cause involuntary withdrawal.
[0022]
However, in the pipe joint of the present invention, as shown in FIG. 3B, the outer hypotenuse 2B of the stabilization ring 2 suppresses the tilting of the hypotenuse 1B outside the lock ring 1, so that the lock ring The hypotenuse 1A inside 1 does not stand up. Therefore, as a result of holding the biting into the tubular body 20 by the oblique side 1B of the lock ring 1, inadvertent detachment of the tubular body 20 is surely prevented.
[0023]
On the other hand, the stabilization ring 2 having a trapezoidal cross section is also effective when the tubular body 20 is mounted. That is, in the case of the conventional example without the stabilizing ring 2, as shown in FIG. 6C, when the tip of the tube 20 comes into contact with the wall surface of the joint body 10 when the tube 20 is mounted, the tube reaches the innermost part. The illusion that the body 20 has reached is the cause of insufficient insertion.
[0024]
However, in the pipe joint of the present invention, as shown in FIG. 3C, the step in the wall surface 10 </ b> B portion of the joint body 10 is eliminated by the oblique side 2 </ b> A inside the stabilization ring 2. Accordingly, the distal end of the tubular body 20 is smoothly guided along the hypotenuse 2A of the stabilization ring 2, and the tubular body 20 can reach the innermost portion without being caught.
[0025]
FIG. 4 is a half cross-sectional view showing another example of the pipe joint of the present invention, and shows a state where the pipe body 20 is mounted on the joint body 10. In the pipe joint of the embodiment shown in FIG. 4, a protrusion is integrally formed on the wall surface of the joint body 10, and the protrusion is used as the stabilization ring 2. Even in this embodiment, the function of the stabilization ring 2 is exactly the same as in the embodiment of FIG.
[0026]
【The invention's effect】
In the pipe joint of the present invention, since the stabilization ring is installed inside the V-shaped opening of the lock ring, the inner peripheral end of the lock ring does not scrape the outer surface of the pipe body when the pipe body is detached. In addition, the lock ring disposed in the tube insertion port is not exposed and the tube is prevented from being carelessly detached. Furthermore, the fear of insufficient insertion at the time of mounting the tube body is solved.
[Brief description of the drawings]
FIG. 1 is a half sectional view showing an example of a pipe joint according to the present invention, and shows a state in which a pipe body is mounted on a joint body.
FIG. 2 is a perspective view showing a stabilizing ring used in the pipe joint of the present invention.
FIG. 3 is an enlarged cross-sectional view showing the periphery of a lock ring and a stabilization ring in the pipe joint of the embodiment shown in FIG. 1;
FIG. 4 is a half sectional view showing another example of the pipe joint of the present invention, and is a view showing a state in which a pipe body is mounted on the joint body.
FIG. 5 is a half sectional view showing a conventional pipe joint, and shows a state in which a pipe body is mounted on a joint body.
6 is an enlarged cross-sectional view showing the periphery of a lock ring in the conventional pipe joint shown in FIG. 5. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Lock ring 1A Inner hypotenuse 1B Outer hypotenuse 1C Outer hypotenuse tip 2 Stabilization ring 2A Inner hypotenuse 2B Outer hypotenuse 2C Lower bottom 3 Release ring 4 Seal ring 10 Joint body 10A, wall surface 10B, wall surface 11, sleeve 20, tube L, spacing S, space

Claims (3)

By placing the lock ring (1) in the tube insertion port so that the cross-section has a V-shaped lock ring (1) and the V-shaped opening faces the deep side of the joint body (10) ( 20 ) a pipe joint that prevents the separation of
Install the stabilization ring (2) inside the V-shaped opening of the lock ring (1) ,
A pipe joint characterized in that the cross section of the stabilization ring (2) is trapezoidal, and the stabilization ring (2) is installed so that the bottom of the trapezoid is directed to the deep side of the joint body (10) .   Pipe fitting according to claim 1, characterized in that the stabilizing ring (2) is a protrusion integral with the fitting body (10). There is a gap (L) between the lower base (2C) in the trapezoidal section of the stabilization ring (2) and the tip (1C) of the outer hypotenuse (1B) in the V-shaped section of the lock ring (1), and A space (S) exists between the inner hypotenuse (2A) in the trapezoidal section of the stabilization ring (2) and the inner hypotenuse (1A) in the V-shaped section of the lock ring (1). The pipe joint according to claim 1 .

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