JPH0610690U - Coupling device - Google Patents

Abstract

(57) [Summary] [Purpose] A small press force is used to obtain a detent effect at the crimp joint between the union and the pipe. [Structure] A cutout groove portion 8 is provided in a deep portion of a bulging portion engaging portion 6.
The cutout groove portions 8 are provided radially from the center line of the through hole 5 toward the outside. Further, the bulging portion 11 of the one-side pipe 1 is pressure-bonded to the notch groove portion 8 as well as the bulging portion engaging portion 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a joint device for connecting a pair of pipes used for a car air conditioner pipe or the like with a union and a nut.

[0002]

[Prior art]

 Conventionally, as shown in FIG. 4, a union 20 of this type of joint device has a through hole 21 for mounting a pipe, and a bulging portion engaging portion 22 is cut out on the inner peripheral surface of the through hole 21. . When fixing the pipe to such a union 20, after inserting the pipe into the through hole 21, a bulging portion is formed on the outer peripheral surface of the pipe by a predetermined pressing force, and the bulging portion is fixed. It is pressure-bonded to the bulging portion engaging portion 22.

[0003]

[Problems to be solved by the device]

 However, in such a conventional joint device, when the pipe is fixed to the union 20 as described above, the bulging portion of the pipe is simply crimp-bonded only to the bulging portion engaging portion 22 of the union 20. Therefore, in order to enhance the anti-rotation effect between the union 20 and the pipe at the crimp joint, a large pressing force is used to form a bulge on the outer peripheral surface of the pipe to increase the surface pressure at the crimp joint. Since it must be done, the equipment required for the press becomes large.

In particular, when a small-diameter and thin-walled pipe is used, the surface pressure of the pressure-bonded joint portion is further lowered, so that a larger pressing force is required.

[0005]

[Means for Solving the Problems]

 The present invention has been made in view of the above circumstances, and an object thereof is to obtain a rotation preventing effect in a crimping connection portion of a union and a pipe with a small pressing force, and achieve the above object. For this purpose, the present invention is directed to a union, a bulging portion engaging portion formed in a notch in an inner peripheral surface of a pipe mounting through hole of the union, and a bulging portion engaging portion inserted into the through hole. A joint device comprising a one-side pipe having a bulging portion formed to be crimp-bonded to the other portion, and the other-side pipe connected and fixed to the one-side pipe by a nut attached to an outer peripheral thread portion of the union, The bulging portion engaging portion is provided with notched groove portions radially outward from the center line of the through hole.

[0006]

[Action]

 According to this invention, the bulging portion of the one-side pipe is pressure-bonded to the notch groove portion as well as the bulging portion engaging portion.

[0007]

【Example】

 An embodiment of the joint device according to the present invention will be described below in detail with reference to FIGS. As shown in FIG. 1, this joint device connects the one-side pipe 1 and the other-side pipe 2 with a union 3 and a nut 4, and the union 3 has a through hole 5 for mounting the pipe as shown in FIGS. The inner peripheral surface of the through hole 5 is formed with a bulging portion engaging portion 6 which is cut out, and the bulging portion engaging portion 6 is provided at one opening 5a of the through hole 5. ing.

A cutout groove portion 8 is formed in the bulging portion engaging portion 6, and the cutout groove portion 8 is located on the inner side of the bulging portion engaging portion 6 and the center line of the through hole 5. It is provided radially toward O ₁ .

In addition to the bulging portion engaging portion 6, the tapered flare engaging portion 9 and the enlarged diameter portion 10 are continuously cut out on the inner peripheral surface of the through hole 5. The flare engagement portion 9 and the enlarged diameter portion 10 are provided in the other side opening 5b of the through hole 5.

By the way, the one side pipe 1 is inserted into the through hole 5 as described above as shown in FIG. 1, and the bulging portion 11 is press-molded on the outer peripheral surface of the one side pipe 1 as described above. In addition, the bulging portion 11 is formed so as to be pressure-bonded not only to the bulging portion engaging portion 6 but also to the notch groove portion 8.

Further, a flare portion 12 and a pipe expanding portion 13 are formed on the tip side of the one-side pipe 1, the flare portion 12 has the shape of the flare engaging portion 9, and the pipe expanding portion 13 has the diameter expanding portion. Each of them is press-formed according to the shape of 10.

Further, the small diameter portion 14 of the other side pipe 2 is inserted into the enlarged diameter portion 13 of the one side pipe 1, and the bag-shaped nut is provided at the rear position of the collar portion 15 of the other side pipe 2. The nut 4 is attached to the outer peripheral threaded portion 16 of the union 3, and the flange portion 15 of the other side pipe 2 is pressed toward the flare portion 12 of the one side pipe 1. The one-side pipe 1 and the other-side pipe 2 are connected and fixed. The O-ring 17 is configured to maintain the airtightness of the connection seam portion between the flange portion 15 and the flare portion 12.

Therefore, according to the above-described embodiment, the bulging portion of the one-side pipe is pressure-bonded not only to the bulging portion engaging portion of the union but also to the notch groove portion, so that the pipe can be pressed with a small pressing force. The anti-rotation effect at the crimping connection portion with the union can be enhanced.

[0014]

[Effect of device]

 In the joint device according to the present invention, since the notch groove portion is provided in the bulging portion engaging portion of the union radially outward from the center line of the through hole as described above, the bulging portion of the one side pipe is Since not only the bulging part engagement part of the union but also the notch groove part is crimp-bonded, it is possible to enhance the anti-rotation effect at the crimp-joint part of the pipe and union with a small pressing force, and the equipment required for pressing The size can be reduced.

[Brief description of drawings]

1 is a sectional view for explaining a joint device according to the present invention.

FIG. 2 is a sectional view of a union in the joint device shown in FIG.

FIG. 3 is a view on arrow A shown in FIG.

FIG. 4 is a cross-sectional view of a union that constitutes a conventional joint device.

[Explanation of symbols]

 1 One Side Pipe 2 Other Side Pipe 3 Union 4 Nut 5 Through Hole 6 Swelling Part Engaging Part 8 Notch Groove 11 Swelling Part

Claims (1)

[Scope of utility model registration request] 1. A union, a bulging portion engaging portion formed by cutting out on an inner peripheral surface of a pipe mounting through hole of the union, and a bulging portion engaging portion inserted into the through hole. A bulging device, comprising: A joint device, wherein notch groove portions are radially provided from a center line of the through hole toward the outside in the portion engaging portion.