JPH0650480A - Pipe fitting incorporating function of confirming insertion of pipe - Google Patents

Abstract

PURPOSE:To prevent occurrence of leakage and come-off of a pipe caused by insufficient insertion of the pipe or the like by providing such an arrangement that the pipe inserted into a recess of a fitting body is pressed by a thin plate provided in the recess so that female threads in the outer diameter of the pipe are deformed so as to have a diameter smaller than that of male threads, and by fastening a cap nut to the fitting body. CONSTITUTION:A fitting body 1 is formed with male threads 11 adapted to be engaged with a cap nut 2, threads 16 adapted to be connected with an equipment or a thread fitting, a recess 14 at the end face side of the threads 11, and a cylindrical member 12 having a protrusion 13 with an armored outer surface, adjacent to the recess 14. After an annular thin resin thin planar member 3 having an L-like sectional shape is fitted in the recess 14 of the fitting body 1, a connection pipe 4 is fitted on the fitting body 1. At this time, the planar member 3 is pressed by the end face of the connection pipe 4 so that it is deformed along an inclined inner wall of the recess 14, and accordingly, the outer diameter of the planar member 3 is made to be smaller than the outer diameter of the male threads 11. Accordingly, it is possible to confirm such a condition that the connection pipe 4 is inserted by a regulated depth. Thereafter, the cap nut 2 is screwed onto the male threads 11 so as to complete the connection of the connection pipe 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a pipe insertion confirmation in which a cap nut cannot be tightened unless a predetermined amount of a pipe to be connected to a joint body is correctly inserted, and thus a connection failure due to a defective insertion of the pipe into the joint body is eliminated. The present invention relates to a pipe joint.

[0002]

2. Description of the Related Art Conventionally, as shown in Japanese Utility Model Laid-Open No. 2-56994, a pipe joint used for a soft resin pipe for supplying hot water and hot water is shown in FIG.
There is something shown in. This joint forms a cylindrical body 7 that supports the inner surface of the connection pipe 5 at one end of the joint body 6 and an insertion portion 8 of the connection pipe 5, and inserts the connection pipe 5 into the insertion portion 8 so that the outer surface of the pipe 5 becomes the inner surface. Cap nut 10 via lock ring 9 having teeth
To tighten and connect.

However, if the cap nut 10 is tightened and connected in a state where the end portion of the connecting pipe 5 is not inserted into the insertion portion 8 by a predetermined amount, problems such as leakage and disconnection of the pipe occur after the connection. In order to prevent this, a mark showing an appropriate insertion amount is attached to the end of the connecting pipe with a marker or the like, and the pipe is inserted to the mark position for connection work. In another conventional example, a hole is formed in the inner part of the insertion portion 8 to reach the outer surface of the joint body, and when the pipe is inserted, the hole is looked into from the outer surface of the joint body to insert the pipe end portion into the inner part of the insertion portion 8. After confirming with the naked eye, the connection work was done.

[0004]

In the former of the above-mentioned prior arts, in the former, it is possible to accurately match the type and size of the joint at the work site.
Marking is very troublesome work, it is difficult to manage, and this mark disappears when inserting the pipe into the joint, and in some cases it is possible to add the mark after inserting the pipe. After all, it was difficult to confirm whether or not the pipe was inserted by a predetermined amount and connected after the completion of the piping work.

In the latter case, depending on the location and location of the piping, it may not be possible to look into the holes provided in the joint body, and it is often the case that it is not possible to look into the holes. Was not. The present invention solves the above-mentioned problems, and unless the pipe to be connected is inserted into the insertion portion of the joint body by a predetermined amount, the cap nut cannot be screwed and tightened, and the pipe is properly inserted due to the connection. The present invention provides a pipe joint.

[0006]

DISCLOSURE OF THE INVENTION The gist of the present invention is to provide a concave portion for receiving a pipe connected to an end portion and a cylindrical body extending toward the end portion on the inner peripheral side of the concave portion and contacting the inner surface of the pipe. A joint body having a thread on the outer surface of the end portion, a cap nut screwed to the male thread, and at least a part of the outer diameter attached to the outer surface of the tubular body so as to close the inlet of the recess. Consisting of a thin plate member that is in contact with the end surface of the pipe and is larger than the diameter of the screw,
By inserting the pipe into the recess of the joint body, the thin plate body is pressed by the end surface of the pipe and the outer diameter of the thin plate body deforms smaller than the outer diameter of the male screw, and the joint body and cap nut are screwed together. This is a pipe joint with a pipe insertion confirmation that can be done. The thin plate body is formed of a resin having flexibility and electrical insulation, and a ring-shaped body is suitable.

[0007]

Since the present invention has the above-described structure, the external thread of the cap nut cannot be screwed into the external thread of the joint body before connection. In addition, even if the connecting pipe is inserted halfway, the outer diameter of the thin plate interferes and the cap nut cannot be tightened. Therefore, when the pipe is correctly inserted by a predetermined amount, the thin plate body is pressed by the end face of the pipe and moves into the recess to be deformed, and the outer diameter of the thin plate body becomes smaller than the male screw due to the deformation, and the female screw of the cap nut and the joint body The male screw can be screwed in and the cap nut can be tightened. If this thin plate is made of resin, when a pipe having a metal outer surface and a resin inner surface or a three-layer composite pipe in which a metal tube such as an aluminum alloy is embedded between the inner and outer surfaces of the resin is used, The pipe joint and the pipe can be electrically insulated, and electrical corrosion and the like that occur between different metals can also be prevented.

[0008]

1 is a sectional view of a joint showing an embodiment of the present invention, showing a state in which a pipe 4 is being inserted into a pipe receiving recess 14 of a joint body 1. The joint body 1 has a male screw 11 for screwing with the cap nut 2 and a recess 14 for receiving a pipe on its end face side, and an annular protrusion 1 with an outer surface on the inner peripheral side of the recess 14 is a bamboo shoot.
3 is present, and the outer surface of the tubular body 12 contacts the inner surface of the connecting pipe 4, and after connection, sealing is performed on this surface.
The central portion is a hexagonal portion for hanging a wrench, and the opposite end outer surface is provided with a screw 16 for connection with an instrument or a screwed joint.

The cap nut 2 has a female thread 21 to be screwed into the male thread 11 of the joint body, a taper inner surface 22 for pressing the outer peripheral surface of the pipe 4 on the inner surface of the rear end, and a wrench hook on the outer surface. It is a hexagonal surface for use. 3 is a thin plate member, and a perspective view thereof is shown in FIG. The thin plate member 3 is made of a thin resin plate having an L-shaped cross section, and is attached to the inlet of the recess 14 of the joint body 1.
The inner surface has a tubular portion 32, a flange portion 31 extending from the tubular portion 32 in the outer diameter direction, and a slit portion 33 at one end in the circumferential direction, so that the flange portion 31 can be easily deformed. A notch 34 is formed. The outer diameter of the flange portion 31 is larger than that of the screw 11 as shown in FIG. In the present embodiment, the cross section is L-shaped, but even if the cross section is I-shaped, it is pressed by the end surface of the pipe 4 and deforms to reduce the outer diameter in the same manner as described above.

FIG. 2 is a sectional view showing a state in which the connecting pipe 4 is inserted into the pipe receiving recess 14 of the joint body 1, and the thin plate member 3 is pressed by the end face of the pipe 4 by the insertion of the pipe 4, and the recess 14 is formed.
Move in. Therefore, the flange portion 31 of the thin plate member 3 is deformed along the inner wall of the recess 14, and the outer diameter of the flange portion 31 becomes smaller than that before insertion of the pipe in FIG. 1. Therefore, male thread 11
The state where the inlet of is closed is changed to the opened state, and the cap nut 2 can be screwed.

FIG. 3 shows a state in which the cap nut is screwed and tightened to the joint body from the state of FIG. 2, and the taper inner surface 22 of the cap nut 2 presses the outer surface of the inserted pipe 4 to form the inner surface of the pipe and the tube. Sealing is performed on the outer surface of the cylindrical body 12, and at the same time, the convex portion 13 of the cylindrical body is formed.
Prevents the pipe 4 from being pulled out. In the case of a composite tube of metal and resin, in which the tube 4 has a metal tube such as an aluminum alloy sandwiched therein, the thin plate body 3 made of resin interrupts the contact with the joint body 1 to be in an electrically insulated state, and dissimilar metals are separated from each other. Prevents electrical corrosion due to contact with.

[0012]

As described above, according to the present invention, the cap nut cannot be tightened unless the connecting pipe is securely inserted by a predetermined amount, so that the leakage and the pipe coming out due to the insufficient insertion of the pipe can be prevented. Further, when the connection is made, the pipe is inserted in a specified amount, so that it is not necessary to confirm the pipe insertion after the connection.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing an embodiment of the present invention during tube insertion.

FIG. 2 is a partial cross-sectional view showing a state in which a predetermined amount of a tube has been inserted from the state shown in FIG.

FIG. 3 is a partial cross-sectional view showing a state in which the cap nut is screwed into the joint body from the state of FIG.

4 is a perspective view showing the thin plate member 3 of FIG. 1. FIG.

FIG. 5 is a cross-sectional view showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joint body 2 Cap nut 3 Thin plate 4 Connection pipe 11 Male thread 12 Cylindrical body 13 Convex part 14 Pipe receiving recessed part 31 Flange part 32 Cylindrical part 34 Notch part

Claims (1)

[Claims] 1. A recess for receiving a pipe connected to an end, a tubular body extending toward the end on the inner peripheral side of the recess and in contact with the inner surface of the pipe, and a screw on the outer surface of the end. A joint body, a cap nut screwed into the male thread, and at least a part of the outer diameter attached to the outer surface of the tubular body so as to close the inlet of the recess is larger than the diameter of the male thread on the end surface of the pipe. A thin plate member that abuts, and by inserting the pipe into the recess of the joint body, the thin plate member is pressed by the end surface of the pipe and the outer diameter of the thin plate member is deformed to be smaller than the outer diameter of the male screw. A pipe joint with a pipe insertion confirmation, characterized in that the body and cap nut can be screwed together.