JPH11257564A - Tube fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect and disconnect a union nut easily from the abutting side of the second tubular coupling member. SOLUTION: This tube fitting is formed by providing a first tubular coupling member 10 in which a male screw 12 is formed on the outer periphery of a cylindrical body; a second tubular coupling member 20 in which a circular groove 22 is formed on the outer periphery of a cylindrical main body, a metal elastic body fitted loosely in the ring form to the circular groove 22 is provided, and a metal ring 29 whose diameter can be contracted in the central direction, as well as whose circular outer diameter is formed larger than the outer diameter of the cylindrical main body normally; and a union nut 30 having an inward flange 34 which is fitted to the second tubular coupling member 20 from the outer side, as well as has a female screw 32 to be screwed to the make screw 12 of the first tubular coupling 10, engageable to the metal ring 29 in the abutting direction, and has an inlet taper surface 37.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a union-shaped pipe joint.

[0002]

2. Description of the Related Art Conventionally, as a union-shaped pipe joint, for example, one pipe end such as a gas pipe is attached, a first tubular joint member having a male thread and corresponding to a union screw, and the other pipe are provided. A second tubular joint member corresponding to a union flange having an outward flange on the side of the abutting portion opposite to the first tubular joint member, and a union nut externally fitted to the second tubular joint member to connect the two joint members; It was constituted by.

[0003]

In such a conventional pipe joint, an outward flange is provided at the abutting portion of the second tubular joint member. Therefore, the union nut is provided in advance from the side having no outward flange. , And is formed so as to be fastened to the external thread of the first tubular joint member on the opposite side.

[0004] However, if the pipe attached to the second tubular joint member is formed integrally with the second tubular joint member and the pipe is long or T-shaped, the second nut of the union nut will not work. There has been a problem that the workability of external fitting to the tubular joint member is deteriorated, or that the union nut cannot be externally fitted.

The present invention has been made in view of the above, and an object of the present invention is to provide a pipe joint in which a union nut can be easily attached and detached from the butting portion of the second tubular joint member. Things.

[0006]

Means for Solving the Problems The present invention has been made to achieve the above object, and a pipe joint according to a first invention has a first tubular member in which a screw is threaded on the outer periphery of a cylindrical body. An annular groove is provided on the outer periphery of the joint member and the cylindrical body. The annular groove is loosely fitted in the annular groove and has metal elasticity, and the annular outer diameter is always larger than the outer diameter of the cylindrical body. A second tubular joint member having a metal ring that can be reduced in diameter in the center direction, and a female screw that is screwed into an external thread of the first tubular joint member, and the metal ring is externally fitted to the second tubular joint member. And a union nut provided with an inward flange capable of engaging in the direction of the abutting portion and having an inlet tapered surface.

A pipe joint according to a second aspect of the present invention includes a first tubular joint member having a male thread, and a second annular joint member having an outwardly flanged metal ring loosely fitted in an annular groove of a main body so as to be reduced in diameter. A union nut having an internal thread screwed into an external thread of the first tubular joint member and having an inward flange engageable in a butting portion direction of the second tubular joint member; The union nut is externally fitted by reducing the diameter of the metal ring from the abutting portion side, and is formed so as to be able to engage in the abutting portion direction with the metal ring whose inward flange is enlarged in diameter. Pipe fitting.

A pipe joint according to a third aspect of the present invention includes a rotatable grip portion, a male thread portion projecting from the grip portion and capable of being screwed into a female screw of a union nut, and a tip end of the male thread portion. A jig for removing a union nut for a pipe joint, comprising a metal ring fitted so as to be able to be reduced in diameter, comprising: a tubular portion projecting axially in a tubular shape and having a tapered portion inside an open end. It is.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 6 show a pipe joint of the present invention, in which a first tubular joint member (hereinafter abbreviated as a first joint member) 10 having a male thread 12 and a second tubular joint member having a metal ring 29 are shown. A joint member (hereinafter, abbreviated as a second joint member) 20 and a union nut 30 having an inlet tapered surface 37 on an inward flange 34 are provided.

The first joint member 10 is formed of a cylindrical member. A screw 12 is threaded around the outer periphery of one end, and a housing 18 such as a gas meter is integrally formed at the other end.
Reference numeral 14 denotes an abutting surface, and reference numeral 16 denotes an inner wall of the pipe.

The second joint member 20 is formed of a main body 21 made of a cylindrical member and a metal ring 29. An annular groove 22 having a depth slightly larger than the diameter of the wire of the metal ring 29 and a width is provided on the outer periphery of the main body 21.
An annular packing 25 having rubber-like elasticity is fitted to the butting portion 24 at one end of the main body 21, and a T-shaped tube 28 such as a gas tube is integrally formed at the other end. Reference numeral 26 denotes an inner wall of the pipe, and a metal ring 29 is loosely fitted in the annular groove 22 in an annular manner.

As shown in FIG. 3, the metal ring 29 is formed in an annular shape partially open by a steel wire having metal elasticity. As shown in FIG. 6, the annular outer diameter of the metal ring 29 at the center of the wire is formed to be slightly larger than the outer diameter of the main body 21, and approximately の of the wire diameter is larger than the outer diameter of the main body 21. It is configured to protrude outward over the entire circumference and to be engaged in the axial direction with approximately half of the wire diameter being located in the annular groove 22 so as to exhibit an action equivalent to a known outward flange.

When the metal ring 29 is pressed toward the center of the ring from the outer peripheral side thereof, the outer diameter of the ring of the metal ring 29 is reduced and immersed in the annular groove 22 to be substantially equal to the outer diameter of the main body 21. It is formed so as to return to the original shape when the diameter becomes the same and there is no pressing from the outer periphery.

The union nut 30 has at one end a female screw 32 which can be screwed into the external thread 12 of the first joint member 10.
It is formed with an inward flange 34 having an inlet tapered surface 37 at the other end.

The inward flange 34 has a through-hole-like inner peripheral surface 3.
5, the diameter of the inner peripheral surface 35 is formed to be slightly larger than the diameter of the main body 21 of the second joint member 20 and smaller than the annular outer diameter of the metal ring 29 fitted in the annular groove 22. The inner side surface 36 is formed so as to engage with the metal ring 29 in the abutting direction. In addition, a chamfered entrance tapered surface 37 having a predetermined gradient is provided on the outer opening end of the inner peripheral surface 35.
Are formed.

As shown in FIG. 5, the union nut 30 is mounted on the main body 2 of the second joint member 20 such that the inward flange 34 is located closer to the T-shaped tube 28 above the metal ring 29.
1 outside.

The second joint member 2 of the union nut 30
The fitting to 0 is performed according to the procedure shown in FIGS.

First, the inward flange 34 of the union nut 30 is opposed to the butting portion 24 of the second joint member 20 (see FIG. 7). Then, the inward flange 34 of the union nut 30 is externally fitted to the second joint member 20, and the union nut 30 is advanced in the direction of arrow A to bring the inward flange 34 into contact with the metal ring 29 (see FIG. 8). At this time, one side of the metal ring 29 abuts one side wall of the annular groove 22,
The other side is in contact with the outer peripheral side of the inclined surface of the entrance tapered surface 37.

Further, when the union nut 30 is pushed in the direction of arrow A, the metal ring 29 gradually reduces its annular outer diameter against metal elasticity due to the advance of the inclined surface of the inlet tapered surface 37 (FIG. 9). Finally, it has the same diameter as the inner peripheral surface 35 of the inward flange 34.

By further pushing out the union nut 30, the inner peripheral surface 35 reaches the outer periphery of the metal ring 29 whose diameter has been reduced, and slides on the outer periphery to move the inward flange 34 above the metal ring 29 ( (See FIG. 10).

Subsequently, the metal ring 29 expands in diameter by metal elasticity below the inward flange 34 so that the union nut 3
0 (see FIG. 11). Metal ring 29
Due to the diameter expansion, approximately 1/2 of the wire diameter protrudes from the outer periphery of the main body 21 to form an outward flange that is loosely fitted into the annular groove 22. Therefore, the inward flange 34 of the union nut 30
5 is engaged with the metal ring 29 in the axial direction to prevent the union nut 30 from being pulled out in the direction of the abutting portion 24 as shown in FIG.

As described above, even if the T-shaped pipe 28 is integrally formed on the second joint member 20 side, the abutting portion 24
The union nut 30 can be quickly and easily fitted from the side.

The second joint member 20 fitted with the union nut 30 has the butting portion 24 facing the butting surface 14 of the first joint member 10 and the union nut 30 is rotated so that the female screw 32 is turned into the first thread. The joint member 10 is screwed into the external thread 12 and fastened to connect.

At this time, the inner side surface 36 of the inward flange 34 of the union nut 30 engages with the metal ring 29 of the second joint member 20, and as the union nut 30 rotates,
The annular packing 25 of the butting portion 24 is brought into close contact with the butting surface 14 via the metal ring 29 and the annular groove 22 (see FIG. 12). Thereby, the first joint member 10 and the second joint member 2
0 is connected, and the pipe inner wall 16 and the pipe inner wall 26 communicate with each other.

Next, the removal of the union nut 30 from the second joint member 20 will be described.

To remove the union nut 30, see FIG.
The removal jig 50 shown in FIG.

The jig 50 has a round bar-shaped grip 51,
A male screw part 52 protruding on the same axis of the grip part 51;
A tubular portion 5 protruding from the male screw portion 52 in a tubular manner on the same axis.
4, a tapered portion 56 having a predetermined divergent slope is formed at the open end of the tubular portion 54 from the inner side toward the outer end. The inner diameter of the tubular portion 54 is
The outer diameter of the tubular portion 54 is smaller than the inner diameter of the female thread 32 of the union nut 30.

The removal of the union nut 30 from the second joint member 20 will be described below with reference to FIGS.

First, as shown in FIG. 14, the tubular portion 54 of the jig 50 is opposed to the union nut 30 fitted to the second joint member 20, and the jig 50 is inserted into the union nut 30.

When the external thread portion 52 of the jig 50 reaches the internal thread 32 of the union nut 30, it grips the outer periphery of the union nut 30 and advances in the direction of arrow A while rotating the jig 50 in a predetermined direction. Then, the male screw portion 52 and the female screw 32 are screwed together. Further, the jig 50 is rotated to connect the tubular portion 54 to the inner peripheral side of the union nut 30 and the second joint member 2.
The tip of the tubular portion 54 is advanced to a position where it comes into contact with the metal ring 29 (FIG. 15).

When the jig 50 is further rotated, the tapered portion 5
6 advances, and the inclined surface presses the outer periphery of the metal ring 29 toward the center. As a result, the metal ring 29 gradually reduces its annular outer diameter against the metal elasticity and immerses into the annular groove 22 to have substantially the same diameter as the outer diameter of the main body 21 of the second joint member 20 (see FIG. 16). ). The tip of the tapered portion 56 is
It stops by contacting the inner surface 36 of the inward flange 34.

Here, the gripping of the union nut 30 is released, the rotation of the jig 50 is stopped, and the jig 50 is moved to the arrow B in FIG.
When moved in the direction, the jig 50 and the union nut 30 move integrally from the second joint member 20 in the withdrawal direction.

At this time, the inner peripheral surface 35 of the inward flange 34
Slides on the outer periphery of the metal ring 29 and is removed from the second joint member 20. Then, the metal ring 29 returns to its original shape (see FIG. 18). The removed jig 50 and the union nut 30 are rotated in opposite directions to separate the union nut 30 from the jig 50. The present invention is not limited to the above description and examples, The embodiment can be changed without departing from the technical idea of the present invention. For example, the chamfer angle of the inlet tapered surface of the union nut can be freely set. In addition, when the union nut is fitted to the second joint member, if a jig capable of reducing the annular outer diameter of the metal ring is used together, the same operation and effect can be obtained even if the above-described inlet tapered surface is omitted. Can be. Further, in the above description, the first and second joint members have been shown as being integrated with a gas meter or a T-shaped tube, but it is a matter of course that a normal pipe connection structure may be used.

[0035]

As described above, according to the pipe joints of the first and second aspects, since the outward flange of the second tubular joint member is constituted by a metal ring capable of reducing the diameter, it is attached to the second tubular joint member. The union nut can be easily and quickly attached and detached from the joint end side of the second tubular joint member of the union nut even if the tube to be formed is long or a T-shaped tube.

Further, according to the jig for removing the union nut of the third aspect, there is an effect that the union nut can be easily removed from the second tubular joint member.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a first tubular joint member according to a pipe joint of an embodiment of the present invention.

FIG. 2 is a partial sectional view showing a second tubular joint member.

FIG. 3 is a perspective view of the metal ring of FIG. 2;

FIG. 4 is a partial sectional view of a union nut.

FIG. 5 is a partial cross-sectional view showing a state where a second tubular joint and a union nut are combined.

FIG. 6 is a partially enlarged sectional view showing an engagement state between a metal ring and a union nut.

FIG. 7 is a partial cross-sectional view showing a state where the second tubular joint member and the union nut are opposed to each other in a union nut attaching step.

FIG. 8 is a partial cross-sectional view showing insertion of a union nut in the mounting step.

FIG. 9 is a partial sectional view showing the reduction of the diameter of a metal ring by a union nut.

FIG. 10 is a partial sectional view showing the inward flange moving over the metal ring.

FIG. 11 is a partial cross-sectional view showing a state where the diameter of the metal ring is expanded in the union nut.

FIG. 12 is a partial sectional view showing a connected state of the pipe joint of the present invention.

FIG. 13 is a partial sectional view of a jig for removing a union nut according to the present invention.

FIG. 14 is a partial cross-sectional view showing a state where the union nut and the jig are opposed to each other in a union nut removing step.

FIG. 15 is a partial sectional view showing insertion of a jig.

FIG. 16 is a partial cross-sectional view showing the reduction of the diameter of the metal ring by the jig.

FIG. 17 is a partial sectional view showing removal of the union nut.

FIG. 18 is a partial sectional view showing a state where the union nut is removed from the second tubular joint member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 1st tubular joint member 12 male thread 20 2nd tubular joint member 22 annular groove 24 butting part 29 metal ring 30 union nut 32 female thread 34 inward flange 37 entrance taper surface 50 removal jig 51 gripping part 52 male screw part 54 Tubular part 56 Taper part

Claims (3)

[Claims] A first tubular joint member having a thread threaded on an outer periphery of a cylindrical body; an annular groove provided on an outer periphery of a cylindrical main body; A second tubular joint member having a metal ring whose annular outer diameter is always larger than the outer diameter of the cylindrical main body and can be reduced in diameter toward the center; and a male screw of the first tubular joint member And a union nut having an inward flange having an internal thread that is screwed into the metal ring and externally fitted to the second tubular joint member and capable of engaging with the metal ring in the direction of the abutting portion and having an inlet tapered surface. A pipe fitting characterized by the following. 2. A first tubular joint member having a male thread; a second annular joint member having an outwardly flanged metal ring loosely fitted in an annular groove of the main body so as to be able to reduce the diameter; and the first tubular joint member. A union nut having an internal thread to be screwed into the external thread and having an inward flange engageable in the direction of the butting portion of the second tubular joint member, wherein the metal is formed from the butting portion side of the second tubular joint member. A pipe joint characterized in that the diameter of the ring is reduced, the union nut is externally fitted, and the inward flange is formed so as to be engaged with the metal ring whose diameter is increased in the direction of the abutting portion. 3. A rotatable grip portion, a male screw portion protruding from the grip portion and capable of being screwed into a female screw of a union nut, and protruding tubularly in the axial direction from a tip end portion of the male screw portion. A jig for removing a union nut for a pipe joint, comprising: a metal ring fitted so as to be able to be reduced in diameter; and a tubular portion having a tapered portion inside the open end.