JP2591388B2 - Piping connection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connection device.

[0002]

2. Description of the Related Art FIG. 16 shows a conventional pipe connection device for connecting a refrigerant pipe. This pipe connection device includes a female connector 2 having a main body 21 having a hole 5 and a ring-shaped caulked portion 6.
And a male tube 1 having a base tube portion 11, a circular flange portion 12, and a distal tube portion 13, and an O-ring 3 fitted to the distal tube portion 13. The distal tube portion 13 is fitted into the hole 5. The circular flange portion 12 is swaged and accommodated in the caulked portion 6, and the outer annular plate surface 12 z of the circular flange portion 12 is joined to the inner annular plate surface 6 z of the swaged portion 6.

[0003]

However, in the above-described crimped pipe connection apparatus, the female connector 2 is connected to the male pipe 1.
However, there is a disadvantage that relative rotation cannot be easily performed, and the mounting posture cannot be fixed, resulting in inconvenience in mounting. The present invention has been made in view of the above problems, and an object of the present invention is to provide a piping connection device that does not allow relative rotation between a female connector and a male tube and is convenient for installation.

[0004]

A heat exchanger according to the present invention comprises a base tube, a ring-shaped annular flange protruding outward from the outer periphery of the base tube end by pipe processing, and A male tube having a cylindrical distal end tube extending from the inner periphery of the circular flange in a direction opposite to the base tube, and a hole having a diameter smaller than the circular flange into which the distal end tube is fitted; A main body having the opening, the entrance of the hole opening from the end face of the main body surrounding the entrance of the hole, protruding outward in the axial direction, and accommodating the flange, and A female connector having a thin ring-shaped caulked portion that is caulked to the outer wheel plate surface, and a female connector fitted to an outer peripheral surface of the distal end tube portion and an outer peripheral surface of the distal end tube portion and an inner peripheral surface of the hole portion. A pipe connection device provided with an O-ring that seals a gap between the outer ring plate surface of the circular flange portion in a circumferential direction.
There is a step, and the step is caulked and joined to the inner wheel plate surface of the caulked portion.

[0005]

The distal end of the male tube is fitted into the hole of the female connector, and the flange of the male tube is accommodated in the ring-shaped caulked portion of the female connector. The inner annular plate surface of the circular flange facing the female connector is locked to the main body, and the outer annular plate surface of the circular flange is swaged to the inner annular plate surface of the swaged portion.

Further, the outer annular plate surface of the circular flange portion is circumferentially
A step is formed in the caulking part.
By caulking to the side wheel plate surface, the step is inside the caulked part
The relative rotation of the male tube is regulated with respect to the wheel plate surface, whereby the male tube is fixed to the female connector so as not to rotate relative thereto. In addition,
The step in the circumferential direction here is formed at this flange.
Means a recessed portion or a projected portion.

[0007]

As described above, the pipe connection device according to the present invention provides the above-mentioned stepped portion which is caulked to the inner wheel surface of the caulked portion.
Since the has the outer ring plate surface of the circular flange portion of the male pipe, it is possible to prevent relative rotation between the female connector and the male pipe, thereby the female connector times around the male pipe when mounting the female connector It is possible to solve the problem that the moving and hinder the mounting.

Further, since the step of the circular flange can be formed by pipe processing at the same time as the circular flange, its production is easy.
Furthermore, since the counterpart member fitted to this step is a caulked portion, the step of the mating member fitted to this step can also be easily formed in an accurate position and in an accurate shape by caulking the caulked portion, making it extremely easy to manufacture. It is easy to achieve an excellent effect that almost no additional steps are required due to the synergistic effect.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. As shown in the sectional view of FIG. 1 and the oblique view of FIG. 2, the pipe connection device of this embodiment has a cylindrical male pipe 1, a female connector 2, and a space between the male pipe 1 and the female connector 2. And an O-ring 3 for performing the operation.

FIG. 6 shows a half sectional view of the male pipe 1 in the axial direction, and FIG. The male pipe 1 is made of a cylinder made of aluminum and has a base cylinder part 11 having an outer diameter of about 8 mm and a wall thickness of about 1 mm, a ring-shaped circular flange 12 at the tip of the base pipe part 11, and a circular flange 12. It has a tube portion 11 and a tip tube portion 13 extending along the same axis. The circular flange portion 12 is formed from the above-described cylinder as a raw material by pipe processing described later, and protrudes radially outward from the outer peripheral surface. The outer diameter of the circular flange 12 is about 12 mm, and the thickness in the axial direction is about 2 mm.

On the outer annular plate surface 12b of the circular flange portion 12 facing the base tube portion 11, the non-rotating convex ridges ( steps in the present invention) 4 extending in the radial direction at intervals of 90 degrees are provided. It is formed by pipe processing. The height of the ridge 4 in the axial direction is about 1 mm, and the width in the circumferential direction is about 2 mm.
The distal tube portion 13 has substantially the same diameter and substantially the same thickness as the base tube portion 11,
The axial length is about 8 mm.

The female connector 2 is a pipe joint formed of aluminum as a material, and as shown in FIG. 1 and FIG. Then, in the figure, the vertical cylindrical portion 22
Project at right angles to the lower end surface 2a. A vertical hole 23 in the vertical cylindrical portion 22 is formed deep in the main body 21. In the figure, the right end face (hereinafter, referred to as an entrance end face) 2c of the main body 21 is formed flat, and the entrance end face 2c is formed.
The hole 5 is formed in parallel with the upper and lower end surfaces 2a and 2b from the upper end and communicates with the vertical hole 23. The hole 5 has a small-diameter cylindrical hole 5a at the back.
And has a large-diameter cylindrical hole portion 5b on the inlet side, and the distal end tube portion 13 of the male pipe 1 is fitted therein. The inner diameter of the small-diameter cylindrical hole portion 5a is set slightly larger than the outer diameter of the distal tube portion 13 to prevent the male tube 1 from rattling after the distal tube portion 13 is fitted.

The main body 21 has upper and lower end faces 2a, 2b.
Through the joint hole 24 independently and parallel to the vertical hole 23.
Is pierced. Further, a thin cylindrical caulking portion 6 is provided to protrude outward in the axial direction from the entrance side end face 2c in parallel with the hole 5 so as to surround the circular entrance of the hole 5. The inner diameter of the base end of the caulked portion 6 is about 13 mm, and the inlet-side end face 2c between the inner edge of the base end of the caulked portion 6 and the entrance of the hole 5 is a ring-shaped plate having a radial width of about 1.5 mm. 3 (see FIG. 3).

FIG. 3 is an enlarged sectional view showing the vicinity of the caulked portion 6. Circular flange 1 facing female connector 2 by caulking
2, the inner wheel plate surface 12a contacts the stopper surface 25,
The outer annular plate surface 12b of the circular flange portion 12 facing the base tube portion 11 is joined to the inner annular plate surface 6a on the distal end side of the swaged portion 6 by swaging.

The O-ring is fitted on the outer peripheral surface of the tip tube portion 13 and seals a gap between the large-diameter cylindrical hole portion 5b of the hole portion 5 and the outer peripheral surface of the tip tube portion 13. As described above, non-rotating convex ridges (non-ring-shaped concave / convex portions in the present invention) 4 extending in the radial direction at intervals of 90 degrees are formed on the outer annular plate surface 12b of the circular flange portion 12 by pipe processing. The caulked portion 6 joined to the protruding ridge portion 4 by caulking
The concave and convex shape opposite to the convex ridge portion 4 is transferred to the inner annular plate surface 6a, so that the caulked portion 6 and the circular flange portion 12 cannot be relatively rotated.

After caulking the male tube 1, the female connector 2 is fastened to a mounting member (not shown) by inserting a bolt (not shown) into the joint hole 24. Hereinafter, a manufacturing process of the pipe connection device will be described. FIG. 7 shows a state before caulking, in which the male pipe 1 is fitted into the hole 101 of the caulking jig 100, and the distal end pipe 11 of the male pipe 1 is fitted into the hole 5.

FIG. 8 shows the caulking end state, and the caulking surface 102 of the caulking jig 100 caulks the caulking portion 6, and FIG.
As shown in the figure, the inner ring surface 6a of the caulked portion 6 is pressed against the outer ring surface 12b of the circular flange portion 12. Due to this caulking, the concavo-convex shape opposite to the convex ridge portion 4 is transferred to the inner annular plate surface 6a of the caulked portion 6 as described above. Next, an example of pipe processing of the male pipe 1 is shown in FIGS.

First, referring to FIG.
00 is sandwiched between a pair of clamping jigs 400 (see FIG. 9). Each of the holding jigs 400 has a holding recess 4 having a half cylindrical shape.
01 is formed, and the upper end portion of the sandwich concave portion 401 is an enlarged diameter portion 402 for expanding and changing the circular flange portion 12. Further, a concave portion 404 is formed in the radial direction on a step surface 403 at the boundary between the sandwiched concave portion 401 and the enlarged diameter portion 402 for forming the convex ridge portion 4.

Next, the outer tube 5 is placed outside the sandwiched cylindrical tube 300.
00, the distal end surfaces of the outer tube 500 are brought into contact with the upper end surfaces of the jigs 400, and then the push rod 200 having a large distal end is pushed. As a result, as shown in FIG. 10, the diameter of the portion to become the distal end tube portion 13 and the circular flange portion 12 of the cylindrical tube 300 is expanded. Next, in FIG. 11, a rod 600 having an outer diameter equal to the original inner diameter of the cylindrical tube 300 is fitted into the cylindrical tube 300, and then the cylindrical tube 700 having a tapered distal end is replaced with the cylindrical tube 30.
0 and forcibly pushed into the enlarged diameter part to reduce the diameter,
A circular flange 12 is formed.

Next, in FIG. 12, a rod 8 having an outer diameter equal to the original inner diameter of the cylindrical tube 300 and having a tapered step at the tip end.
00 is inserted into the cylindrical tube 300, and then the cylindrical tube 900 having a flat distal end surface is pushed into the cylindrical tube 300 to shape the circular flange portion 12. Here, the inner diameter of the distal end portion of the cylindrical tube 900 is equal to the outer diameter of the distal tube portion 13, and the inner diameter of the inner portion of the cylindrical tube 900 is equal to the original inner diameter of the cylindrical tube 300 (the distal tube portion 13.
The inner surface of the cylindrical tube 900 is shaped), and the step surface in the radial direction at the boundary between the distal end portion and the back portion of the cylindrical tube 900 pushes the distal end surface of the cylindrical tube 300 to perform the above-described shaping. In the final stage of the pushing, the distal end surface of the cylindrical tube 900 presses the concave portion 404 of the step surface 403 of the jig 400 with the circular flange portion 12 therebetween to form the convex ridge portion 4 (see FIG. 13). In addition, the number of convex ridges 4,
The shape and position can be changed as appropriate.

Another embodiment is shown in FIGS. In this embodiment, instead of the ridge 4, a small cylindrical ridge (the present invention)
A step 4a is provided on the outer annular plate surface 12b of the circular flange 12 so as to protrude therefrom. In this way, the male pipe 1 is connected to its distal end 1
3 and the upper and lower side surfaces 40 of these small cylindrical projections 4a can provide an effect of preventing the relative rotation or play of the male pipe 1 in the X direction shown in FIG.

In the above embodiment, the circular flange 12 is provided with a detent in the form of a convex. However, the circular flange 12 is naturally provided with a concave portion (a step in the present invention) , and the caulked portion 6 is provided with a convex. The portion may be caulked.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a pipe connection device according to an embodiment of the present invention when connection is completed.

FIG. 2 is a perspective view of FIG. 1,

FIG. 3 is an enlarged sectional view showing the vicinity of a caulked portion;

FIG. 4 is a perspective view of a male pipe,

FIG. 5 is a front view of the male tube in FIG.

FIG. 6 is an axial half-sectional view of a male pipe,

FIG. 7 is a sectional view showing a caulking step;

FIG. 8 is a sectional view showing a caulking step;

FIG. 9 is a perspective view showing a pipe processing step of a male pipe;

FIG. 10 is a cross-sectional view showing a pipe processing step of a male pipe.

FIG. 11 is a cross-sectional view showing a male pipe processing step;

FIG. 12 is a cross-sectional view showing a pipe processing step of a male pipe.

FIG. 13 is an enlarged sectional view showing a pipe processing step of a male pipe;

FIG. 14 is a front view showing a modification of the male pipe;

FIG. 15 is an enlarged cross-sectional view of the vicinity of a caulked portion showing the above-described modified embodiment

FIG. 16 is a cross-sectional view of a conventional pipe connection device,

[Explanation of symbols]

1 is a male tube, 2 is a female connector, 3 is an O-ring, 4 is a convex ridge ( step ), 5 is a hole, 6 is a caulked portion, 11 is a base tube, 1
2 is a circular flange portion, 13 is a tip tube portion, 21 is a main body portion, 12b is an outer annular plate surface of the circular flange portion 12,

Claims (1)

(57) [Claims] A base plate portion, a ring-shaped annular flange protruding radially outward from a distal end outer periphery of the base tube portion by pipe processing, and a base plate portion extending from an inner periphery of the annular flange portion. A male pipe having a cylindrical tip tube extending in the opposite direction, a body having a hole smaller in diameter than the circular flange into which the tip tube is fitted, and an entrance of the hole. A thin ring-shaped member that projects outwardly in the axial direction from the end face of the main body portion that opens and surrounds the entrance of the hole portion and that is configured to house the circular flange portion and to be caulked to the outer annular plate surface of the circular flange portion. A female connector having a caulked portion, and an O-ring fitted to the outer peripheral surface of the distal end tube portion and sealing a gap between the outer peripheral surface of the distal end tube portion and the inner peripheral surface of the hole portion. In the piping connection device provided with , a step in the circumferential direction is formed on the outer annular plate surface of the circular flange portion.
A, the step is pipe connection apparatus characterized by being crimped to the inner wheel plate surface of the caulked portion.