JPH11336962A - Union joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability of connecting to a mate member, by preventing slip off of a union nut from a joint pipe. SOLUTION: A union joint device is provided with a joint pipe 12 having a flange part 14 protruded in a diametric direction in one end side of an axial direction to serve as a circulating path of fluid, union nut 13 formed with an internal thread 17 in an inner surface also formed with a union brim part 18 abutted to the flange part 14 to connect the joint pipe 12 to a mate member with the union brim part 18 abutted to the flange part 14 by screwing the internal thread 17 to a mate member 21 in a condition inserting the joint pipe 12, at least one protrusion part 16 protruded in a diametric direction from an outer surface of the joint pipe 12 in a position separated from the flange part 14 to prevent slip off of the union nut 13, and a hollow part formed in the union brim part 18 to permit insertion of the protrusion part 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a union joint used for a pipe for supplying a fluid such as gas, water and oil.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional union joint, which is constituted by a joint pipe 1 penetrating a union nut 2. FIG. This union joint is joint tube 1
Are inserted into the union nut 2 and relatively moved along the axial direction.

A flow passage 1a through which a fluid such as gas or water flows passes through the joint pipe 1 in the axial direction. A flange 3 protrudes from one end of the joint tube 1 in the axial direction, and a male screw 4 is formed on the outer periphery of the other end in the axial direction. The flange portion 3 on one end side is connected to a mating member by surface-contacting a connecting pipe (not shown) from a mating member such as a gas meter. The male screw 4 on the other end is screwed into a female screw 5 a on the inner surface of the external pipe 5.

[0004] The union nut 2 is a cap nut having a union flange 7 at one end, which is bent inward in the radial direction.
On the inner surface, a female screw 6 to be screwed with a mating member to which the joint pipe 1 is connected is formed on the inner surface.

[0005] By screwing the female screw 6 of the union nut 2 to the male screw of the connecting pipe from the mating member, the union flange 7 presses the flange 3 of the joint pipe 1 against the connecting pipe of the mating member. Thereby, since the union joint connects the pipe 5 for supplying the fluid and the other member such as the meter, the meter can measure the usage amount of the fluid and the like.

[0006]

However, in the conventional union joint, the union nut 2 easily falls off from the joint pipe 1 during the connection work, and it is necessary to penetrate the union nut 2 again. For this reason, there is a problem that the workability of the connection is reduced.

The present invention has been made in consideration of such conventional problems, and has a structure capable of preventing the union nut from falling off the joint pipe and improving the connection workability. It is intended to provide a union joint.

[0008]

In order to achieve the above object, an invention according to a first aspect of the present invention is directed to a joint pipe having a radially protruding flange portion at one end in an axial direction and serving as a fluid flow passage; A female screw is formed on the inner surface, and a union flange that contacts the flange is formed, and the union flange is attached to the flange by screwing the female screw to a mating member with the joint pipe penetrating therethrough. A union nut that abuts and connects the joint pipe to the mating member, and at least one protrusion that projects radially from an outer surface of the joint pipe at a position separated from the flange portion to prevent the union nut from falling off; And a recess formed in the union flange to allow the projection to pass therethrough.

In the present invention, the female thread of the union nut is screwed into the mating member, so that the union flange of the union nut comes into contact with the flange portion of the joint pipe and presses the joint pipe against the mating member. The mating member can be connected.

In this structure, the union joint is assembled by allowing the joint tube to penetrate the union nut while the projection projecting radially of the joint tube is inserted into the recess of the union nut. After this assembling, the joint pipe and the union nut are relatively rotated so that the projection and the recess do not coincide with each other. As a result, the projection interferes with the union flange of the union nut, so that the union nut does not fall out of the joint pipe. For this reason, the workability of connection can be improved.

According to a second aspect of the present invention, in the first aspect of the present invention, a coupling thread portion is formed at the other end of the joint pipe.

According to the present invention, since the connecting screw portion is screwed to another mating member made of a steel pipe or the like so as to be connected to another mating member, it is possible to connect the two mating members via a union joint. it can. In this structure, since the union joint is a part independent of the two mating members, the union joint can be exchanged and can be applied to other members.

[0013]

1 to 3 show one embodiment of the present invention. FIG. 1 is a perspective view of a use example of a union joint 11, FIG. 2 is a sectional view of the union joint 11, and FIG. 2 shows a bottom view of the union nut 13, and the union joint 11 is shown in FIG.
As shown in the figure, the joint pipe 12 and the union nut 13 are assembled.

In this embodiment, as shown in FIG. 1, the union joint 11 connects a mating member 21 such as a pressure regulator and another mating member such as a pipe 25 for supplying gas. In this connection, the union nut 13 is screwed into a connection pipe 22 from a mating member 21 such as a pressure regulator, and the joint pipe 12 is connected to another mating pipe 25
By screwing it. By this connection, the mating member 21 such as a pressure regulator can adjust the pressure of gas or the like.

FIG. 2 shows a joint pipe 12 of the union joint 11.
As shown in the figure, a flow passage 12a through which a fluid such as a gas flows penetrates in the axial direction. A radially protruding flange portion 14 is formed on one end of the joint tube 12 in the axial direction, and a male screw as a connection screw portion is formed on the outer surface of the other end of the joint tube 12 in the axial direction. A screw 15 is formed.

The flange 14 is connected to the connecting pipe 2 of the mating member 21.
2 is connected to the connecting pipe 22 by contacting the end face of the connecting pipe 22. To ensure this connection, a sealing material (not shown) such as packing is inserted between the flange portion 14 and the connection pipe 22.

The male screw 15 serving as a connecting screw portion is screwed to a female connecting screw 26 formed on the inner surface of the pipe 25 as another mating member, thereby connecting the pipe 25 and the union joint 11. .

Further, on the outer surface of the joint pipe 12, a projection 1 is provided.
6 are formed. The protrusion 16 is located at a position separated from the flange 14 on one end, and the male screw 15 on the other end.
And protrudes radially from the outer surface of the joint pipe 12 so as not to overlap. The protrusion 16 prevents the union nut 13 from falling off, as described later. Although two projections 16 are formed in the illustrated embodiment, at least one projection 16 may be provided to prevent the union nut 13 from falling off.

As the union nut 13, a cap nut having a union flange 18 formed at one end thereof bent radially inward is used. The union flange portion 18 comes into contact with the flange portion 14 of the joint pipe 12 and presses the flange portion 14 against the end surface of the connecting pipe 22 of the mating member 21.

A female screw 17 is formed on the inner surface of the union nut 13 at the end opposite to the union flange 18. The female screw 17 is screwed to the connecting pipe 22 of the mating member 21, and the union joint 1 is
1 is attached to the mating member 21.

Further, a recess 19 is formed in the union flange 18 of the union nut 13. Recess 19
3, is formed by depressing the inner end surface of the union flange portion 18 of the union nut 13 outward in the radial direction. The recess 19 is formed in the projection 1 of the joint pipe 12.
6 is formed in a size and a shape that can be inserted, thereby allowing the projection 16 to be inserted. For this reason, the concave portion 19 is formed on the union flange 18 so as to be located at a position corresponding to the projection 16 of the joint pipe 12.

In such an embodiment, the joint pipe 12 is inserted into the union nut 13 from the other end of the joint pipe 12 (the side on which the male screw 15 is formed). At this time, the union joint 11 is assembled by allowing the joint tube 12 to penetrate the union nut 13 while inserting the projection 16 on the outer surface of the joint tube 12 into the recess 19 formed in the union flange 18 of the union nut 13.

After this assembly, the protrusion 16 and the recess 1
The joint pipe 12 and the union nut 13 are relatively rotated so that 9 does not match. As a result, the projection 16 interferes with the union flange 18 of the union nut 13,
The union nut 13 does not fall out of the joint pipe 12. As described above, since the connection with the counterpart member 21 is performed in a state where the union nut does not fall off, the workability of the connection can be improved.

In this embodiment, a male screw 15 is formed at the other end of the joint pipe 12, and a pipe 25 as another mating member can be connected through the male screw 15. For this reason, the union joint 11 is a separate and independent part from the two mating members 21 and 25.
While only the union joint 11 can be replaced,
It can be applied to other members different from the mating members 21 and 25, and has great versatility.

FIG. 4 shows another embodiment of the union joint 11, and the same parts as those in the above-described embodiment are denoted by the same reference numerals and correspond to each other. In this embodiment, the joint pipe 12
A male screw 15 is formed on the other end side in a tapered shape tapering toward the tip.

A projection 16 for preventing the union nut 13 from slipping off is formed at one place on the outer surface of the joint pipe 12. A recess 19 for allowing the projection 16 to pass therethrough is also formed on the union flange 18. It is formed in the place. In the case where the protrusion 16 and the recess 19 are provided at only one position as described above,
Since the interference area between the projection 16 and the union flange 18 is increased, it is possible to more reliably prevent the union nut 13 from falling off.

[0027]

As described above, according to the first aspect of the present invention, since the joint pipe penetrating the union nut is formed with the projection projecting in the radial direction, the projection is formed with the union flange of the union nut. Interference does not cause the union nut to fall out of the joint pipe, so that the workability of connecting the union joint can be improved.

According to the second aspect of the present invention, since the union joint is a part independent of the two mating members, the union joint can be replaced, and the union joint can be applied to other members.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a usage example of a union joint according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a union joint according to one embodiment.

FIG. 3 is a bottom view of a union nut used for the union joint of one embodiment.

FIG. 4 is an exploded perspective view of a union joint according to another embodiment.

FIG. 5 is a sectional view of a conventional union joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Union joint 12 Joint pipe 13 Union nut 14 Flange part 15 Male screw 16 Protrusion part 17 Female screw 18 Union flange part 19 Depression part

Claims (2)

[Claims] 1. A joint pipe having a radially protruding flange portion at one end in an axial direction and serving as a fluid passage, and a union flange formed with an internal thread on an inner surface and abutting on the flange portion. A union nut is formed, wherein a union flange is brought into contact with the flange portion by connecting a female screw to a mating member in a state where the joint tube has penetrated, and the joint tube is connected to the mating member. At least one protrusion that protrudes radially from the outer surface of the joint pipe at a position separated from the union nut to prevent the union nut from falling off, and a recess formed in the union flange to allow insertion of the protrusion. A union joint comprising: 2. The union joint according to claim 1, wherein a connection screw portion is formed on the other end of the joint pipe.