JP2002005352A - Connecting device for piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting device for piping allowing an easy and exact pipe connection. SOLUTION: This connecting device comprises a flared connector 1 having a tubular body 7 connected to one side of a through-hole 3, a sealing surface 4 formed at an opened peripheral edge on the other side, a screw part 5 and a guide part 6 having slightly larger outer diameter than the screw part 5; a screw part 9 having a guide part 8 with inside diameter slightly larger than the guide part 6 of the flared connector 1 and corresponding to the screw part 5 of the flared connecting tool 1 at the depth of the guide part 8; and a flared nut 2 having a sealing surface 10 facing the sealing surface 4 and a through-hole 11 coaxial with the through-hole 3 of the flared connecting tool 1 at a tip part. A tubuar body 12 is connected to the flared connector 1 using the flared nut 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connecting device used in an air conditioner and the like, and more particularly, to a structure for easily and accurately connecting pipes.

[0002]

2. Description of the Related Art Conventionally, a pipe connecting device which has been used is composed of a flare connecting member 21 having a shape as shown in FIG. The flare connecting tool 21 has a sealing surface 24 formed on the periphery of one side opening of the through hole 23, a threaded portion 25 formed on the outer periphery, and one tube 26 connected to the opening on the other side. Has become. Further, the flare nut 22 has a threaded portion 27 corresponding to the threaded portion 25 of the flare connection device 21 formed on the inner peripheral surface thereof, and a seal surface facing the seal surface 24 of the flare connection device 21 at the back of the threaded portion 27. 28 is formed, and a through hole 29 is formed at the end of the tube 30 so as to be coaxial with the through hole 23 of the flare connector 21. The other end of the tube 30 passing through the through hole 29 has a structure shown in FIG. As shown in B), a flare (flange) 31 facing the sealing surface 24 of the flare connecting tool 21 is formed, and a flare nut 22 is formed.
To both sides of the flare 31 by sealing the two sealing surfaces 24 of the flare connector 21 and the flare nut 22,
28 to prevent refrigerant leakage.

[0003]

By the way, the tube 30
Is not necessarily a straight pipe, and is often bent or otherwise processed except for a part inserted into the through hole 29. Therefore, in the pipe connection work, the flare nut 22 is connected to the flare fitting 21. It is difficult for the two to be coaxial with each other, and the two cannot be easily engaged with each other (screwed), so that not only the piping connection takes too much time, but also a piping connection failure may occur. Accordingly, an object of the present invention is to provide a pipe connection device that can easily and accurately connect pipes.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and has an opening on one side of a through-hole having a size capable of inserting a tube, and an opening on the other side. A flare connector which forms a sealing surface on the peripheral edge, forms a threaded portion on the outer periphery, and a guide portion slightly larger in diameter than the threaded portion, and connects one of the tubes to the one-side opening. A guide portion having an inner diameter slightly larger than the guide portion of the flare connection device is formed on one side, and a screw portion corresponding to the screw portion of the flare connection device is formed on an inner peripheral surface at the back of the guide portion. A flare nut having a seal surface facing the seal surface of the flare connector at the back of the screw portion, and a through hole coaxial with the through hole of the flare connector at the tip end. The other tube inserted into the through hole from the tip of the flare nut A flange which is sandwiched between two sealing surfaces of the flare nut and said flare fitting formed on an end portion,
The other tube body is connected to the flare connector by screwing the flare connector and the flare nut.

[0005] In addition, both the threaded portions of the flare connector and the flare nut are formed to have substantially the same length, and both guide portions are formed longer than the threaded portions.

Further, the length of the two guide portions is formed to be approximately 1.5 times the length of the two screw portions.

[0007]

FIG. 1 is a block diagram showing an embodiment of the present invention.
A description will be given based on FIG. In the figure, 1 is a flare connection tool, and 2 is a flare nut.

A through hole 3 is formed in the flare connector 1, a sealing surface 4 is formed on the periphery of one side opening, and a screw portion 5 is provided on the outer periphery and the outer diameter is slightly smaller than the screw portion 5 (for example, A guide portion 6 having a large size (about 2 mm) is formed, and a tube 7 is inserted into the opening on the other side and welded.

On the other hand, the flare nut 2 has, on one side facing the flare connector 1, a guide portion 6 on the flare connector 1 side.
A guide portion 8 having an inner diameter slightly larger (for example, about 1 mm) than the outer diameter of the guide portion 8 is formed, and a screw portion 9 corresponding to the screw portion 5 of the flare connector 1 is formed on the inner peripheral surface at the back of the guide portion 8. In addition, a sealing surface 10 facing the sealing surface 4 of the flare connector 1 is formed at the back of the screw portion 9, and a through hole 11 coaxial with the through hole 3 of the flare connector 1 is formed at the tip. I have.

The screw portion 5 of the flare connector 1 and the screw portion 9 of the flare nut 2 are formed to have substantially the same length a, and the guide portion 6 of the flare connector 1 and the guide portion 8 of the flare nut 2 are also formed. The length is almost the same, and the length is 1.5a, which is 50% higher than that of the screw portions 5 and 9. The reason is that the guide parts 6, 8 before the screw parts 5, 9 mesh with each other.
This is for engaging the screw portions 5 and 9 smoothly with each other.

At the time of the pipe connection by the flare connection tool 1 and the flare nut 2 described above, first, the pipe 12 is inserted into the through hole 11 formed at the tip of the flare nut 2,
The flange sandwiched between the sealing surface 3 of the flare connecting device 1 and the sealing surface 10 of the flare nut 2 by flare processing at the tip of
13, the tube 12 can be connected to the flare connector 1 by screwing the flare connector 1 and the flare nut 2 as shown in FIG.

[0012]

By using the connecting device composed of the flare connector and the flare nut as described above, the pipe connection can be easily and accurately performed by the action of the guide portion, and the work efficiency is improved and the pipe connection failure is improved. Eliminating this also eliminates refrigerant leakage and contributes to improved product quality.

[Brief description of the drawings]

FIG. 1 is a side view showing components of a pipe connection device according to the present invention.

FIG. 2 is an explanatory view of the assembly of the pipe connection device according to the present invention.

FIG. 3 is a side view showing a conventional pipe connection device, and FIG.
The figure shows a state before the tube body is subjected to flare processing, and the figure (B) shows a state after the tube body is subjected to flare processing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flare connection tool 2 Flare nut 3 Through hole 4 Seal surface 5 Screw part 6 Guide part 7 Pipe (Piping) 8 Guide part 9 Screw part 10 Seal face 11 Through hole 12 Pipe (Piping) 13 Flange

Claims (3)

[Claims] An opening on one side of a through-hole is formed in a size that allows insertion of a tubular body, a sealing surface is formed on the periphery of the opening on the other side, a screw portion on the outer periphery, and a slightly smaller portion than the screw portion. A flare connecting device that forms a large-diameter guide portion and connects one of the pipes to the one-side opening, and a guide portion having an inner diameter slightly larger than the guide portion of the flare connecting device on one side. And a screw portion corresponding to the screw portion of the flare connection device is formed on the inner peripheral surface at the back of the guide portion, and a seal surface facing the seal surface of the flare connection device is formed at the back of the screw portion. A flare nut having a through-hole formed coaxially with the through-hole of the flare connector at the tip, and the tip of the other tubular body inserted through the through-hole from the tip of the flare nut. A flank sandwiched between the sealing surfaces of the flare fitting and the flare nut A pipe connecting device, wherein the other tube body is connected to the flare connector by screwing the flare connector and the flare nut. 2. The piping connection device according to claim 1, wherein both the threaded portions of the flare connection tool and the flare nut are formed to have substantially the same length, and both guide portions are formed longer than the threaded portions. 3. The length of the two guide portions is approximately 1.5 times the length of the two thread portions.
The piping connection device as described.