JPH07174269A - Flare joint - Google Patents

Abstract

PURPOSE:To provide a flare joint easy to connect, allowing a nut to be easily engaged with a pipe even after flare machining and enabling to connect without giving a twisting action on the pipe. CONSTITUTION:A flare tube 40 with a horn-shape flare part 41 formed by opening an end connection part is pressed by a pressure ring 20 so as to be connected to the tapered outer face 12 of a joint body 10. An annular retainer 30 having the pressing face to be engaged with the outer face of the flare part on one end side and also having the spline like uneven outer peripheral surface on the outer face is mounted between the pressure ring 20 and the flare part 41 of the tube 40. The annular pressure ring 20 has an inner diameter fittable by insertion to the periphery of the flare end part of the flare tube 40, and the uneven inner peripheral surface fittable by insertion to the uneven outer peripheral surface of the retainer. This annular pressure ring 20 is fitted by insertion to the periphery of the annular retainer 30 and engaged with the retainer 30, and the flare tube 40 is pressed to the tapered outer face 12 of the joint body 10 through this retainer 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flare joint in which a flared portion is formed at an end portion of a pipe and the flared portion of the pipe is crimped to a tapered outer surface provided at an end portion of a joint body. Is.

[0002]

2. Description of the Related Art Conventionally, there is a flare joint shown in FIGS. 4 and 5 disclosed in Japanese Utility Model Laid-Open No. 63-20592. In this case, after the nut 4 is sheathed in the straight pipe 5, a flare portion 5a is formed at the connecting end portion of the straight pipe 5 to form a tapered inner surface 4 of the nut 4.
b, the nut 4 is screwed onto the joint body 3 and the flare portion 5a of the pipe 5 is pressed against the tapered outer surface 3b at the end of the joint body 3 to seal the joint body and the pipe.

[0003]

The above-mentioned conventional technique is widely used as a joint having a simple structure and a reliable connection, but when the flare portion 5a is formed on the pipe 5, the nut 4 must be placed in the correct direction. The nut 4 cannot be engaged with the pipe 5 unless the flare portion 5a is formed at the end of the pipe 5 after the pipe 5 is sheathed. That is, if the nut 4 is forgotten to be mounted, or if the flare portion 5a is formed by mounting the nut 4 in the opposite direction, the flare portion 4a cannot be connected, and the flare portion 4a thus formed is cut off and the work is repeated. I have to start over.

Further, since it is necessary to flare the end portion of the pipe 5 with the nut 4 mounted on the pipe 5, it is difficult to perform the flaring process at the pipe end portion in a narrow piping site or the like.
Furthermore, since the nut 4 and the flare portion 5a of the pipe 5 are in direct contact with each other, the rotational force of the nut 4 when the nut 4 and the joint body 3 are screwed together is transmitted to the pipe 5, and the pipe 5 is twisted at the time of connection. There is. The present invention solves the above-mentioned problems, and provides a flare joint in which a push ring can be easily engaged with a pipe after flare processing and can be connected without giving a twisting action to the pipe.

[0005]

SUMMARY OF THE INVENTION The gist of the present invention is a joint for expanding a connection end portion and pressing a flare pipe having a trumpet-shaped flare portion with a push ring to connect it to the joint body. A fitting body having a tapered outer surface with a tapered tapered outer surface and an end portion, a pressing surface that is mounted between the flare portion and the push ring, engages with the outer surface of the flare portion on one end side, and has a spline-shaped unevenness on the outer surface. An annular retainer having an outer peripheral surface, and an annular pressing ring having an inner diameter that can be externally inserted into the flare end portion of the flare tube and having an uneven inner peripheral surface that can be externally inserted from the inner diameter to the uneven outer peripheral surface of the retainer. The push ring is externally inserted from the end of the flare tube on which the retainer is externally inserted to engage the retainer,
The flare joint is characterized in that the flare pipe is pressed against the outer surface of the taper via a retainer to be connected thereto. In the above, as the fastening means for the joint body and the push ring, flange type fastening in which bolts and nuts are used for fastening can be used.

[0006]

Since the present invention has the above structure, the push ring has an inner diameter that can be externally inserted into the flare portion of the flare tube. In addition, the inner and outer peripheral surface of the push ring can be externally inserted into the outer peripheral surface of the spline-shaped outer surface of the retainer. Therefore, even after the flare portion is formed at the pipe end, the push ring can be extrapolated from the end of the flare pipe. For this reason, the push ring can be externally fitted to the flare portion of the pipe end and the uneven outer peripheral surface of the retainer.After the push ring is externally fitted to the retainer, it is possible to make a slight change in the circumferential positional relationship between the uneven outer peripheral surface of the retainer and the uneven inner surface of the retainer. The concave and convex outer surfaces of the retainer overlap and engage with each other.

By fastening the push wheel engaged with the retainer and the joint body, one end of the retainer is engaged with the outer surface of the flare portion and the other end is engaged with the push wheel, so that the flare pipe is inserted through the retainer. The flare part of can be pressed against the taper outer surface of the joint body and can be connected. Therefore, it is possible to easily connect even a flare tube having a flare portion by simply externally attaching a retainer to the end of the tube and prevent mistakes in piping work.

[0008]

EXAMPLES Examples of the present invention will be described below. Figure 1
3 to 4 show a flare joint according to an embodiment of the present invention, which includes a joint body 10, a push ring 20, a retainer 30, and a packing 17, and a flare portion 41 formed on a flare tube 40 is formed between the joint body 10 and the retainer 30. Connect by pinching. The joint body 10 has a through-flow passage 11 formed therein, a tapered outer surface 12 having packing grooves 13 on both outer surfaces of both ends, and a flange portion 14 formed on an outer surface of a central portion. In the packing groove 13, a rubber packing 17 having a circular arc section 15 and an inclined flat plate section 16 is attached.

The retainer 30 is, as shown in FIGS. 2 and 3,
An annular shape having a tapered portion 32 that abuts the flare portion 41 of the flare tube 40 on the inner side, a parallel outer surface 33 and a spline-shaped uneven outer peripheral surface 34 on the outer side, and between the parallel outer surface 33 and the uneven outer peripheral surface 34. The step portion 35 is formed. Uneven outer peripheral surface 34
Is inserted into the uneven inner peripheral surface 21 of the push wheel 20 described later. The push ring 20 is a bolt-nut tightening type flange, and the inner surface thereof has a spline-shaped concavo-convex inner peripheral surface 21 that can be externally inserted into the concavo-convex outer peripheral surface 34 of the retainer 30 having an inner diameter that can be externally inserted into the flare portion 41 of the flare tube 40. . As shown in FIGS. 2 and 3, after the push wheel 20 is mounted on the retainer 30, the positional relationship in the circumferential direction with the retainer 30 is slightly changed, so that the step 35 on the uneven outer peripheral surface of the retainer 30 and the uneven inner circumference of the push ring 20. The step 22 of the surface overlaps and engages.

In connection, as shown on the right side of FIG. 1, the retainer 30 is externally fitted to the flare tube 40 and the flare tube 4 is inserted.
A flare portion 41 is formed at the end of 0, and the push ring 20 is inserted from the flare portion 41 of the flare tube 40 as shown in FIG. After inserting the flare portion 41 and the retainer 30 into the retainer 30, the push wheel 20 is slightly rotated in the circumferential direction with respect to the retainer 30, and the push wheel 20 and the retainer 30 are engaged with each other by the spline-shaped uneven surfaces 34 and 21 overlapping each other. In this way, the push ring 20 is attached to the joint body 1
When the bolts and nuts are fastened to 0, the retainer 30 is pushed by the push ring 20, and the flare portion 41 is pressed against the joint body 10 side. Then, as shown in the left cross section of FIG. 1, on the large diameter side of the flare portion 41, the tapered outer surface 12 of the joint body is
The rubber packing 17 is sandwiched between the small diameter side of the flare portion 41 and the joint body to perform sealing. The flat plate portion 16 of the rubber packing 17 is located at the end of the joint body, and prevents a gap from being formed by the metal surfaces of the joint body 10 and the flare pipe 40, so-called crevice corrosion is prevented.

Further, since the joint body 10 has the flange portion 14, when the push wheels 20, 20 are fastened with the bolt nut, the side surface of the push wheel 20 may come into contact with the flange portion 14 to complete the tightening of the bolt nut. 20 and the joint body 10 are aligned with each other in axis, and the flare portion 41 and the packing 17 are uniformly tightened, so that reliable seal connection can be performed.
Moreover, since the push ring 20 can be easily attached to and connected to the flare pipe 40 having the flare portion 41 formed therein, if the flare portion 41 is formed by externally attaching the retainer 30, the pipe 40 can be easily installed at the piping site. The end does not need to be flared, and piping can be performed easily even in piping work in a narrow space. In addition to the above-described embodiment, the push ring 20 may be a nut type in which the joint body 10 is screwed and fastened. In this case, since the push ring 20 pushes the pipe 40 via the retainer 30, the rotational force of the push ring is directly flared. The flare pipe 40 is not twisted by the pressing force applied to the joint body 10 side without being transmitted to the flare pipe 40.

[0012]

As described above, according to the flare joint of the present invention, it is not necessary to flare the end of the pipe at the site where the piping is carried out, and the flare pipe flared in advance can be used. Also, piping can be done easily. Further, since the retainer 30 is interposed between the push ring 20 and the flare tube 40, the tube is not twisted.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a first embodiment before connection.

FIG. 2 is a front view showing a state in which a push wheel 20 and a retainer 30 of FIG. 1 are inserted.

FIG. 3 is a cross-sectional view showing an inserted state of a push wheel 20 and a retainer 30 of FIG.

FIG. 4 is a partial cross-sectional view showing a conventional technique before connection.

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

[Explanation of symbols]

 10 Joint body 12 Tapered outer surface 13 Packing groove 20 Push ring 14 Collar part 15 Arc part of packing 16 Flat plate part of packing 17 Packing 20 Push ring 21 Spline-like uneven inner peripheral surface 22 Step part of push ring 30 Retainer 32 Retainer 33 Retainer Parallel outer surface 34 Retainer spline-shaped uneven outer peripheral surface 35 Retainer step 40 Flare pipe 41 Flare pipe flare

Claims (1)

[Claims] 1. A joint for connecting a flare pipe, in which a flared portion having a trumpet shape is formed by expanding a connection end portion, with a push ring to connect to a joint body, wherein a flow port is provided inside and a taper is tapered at the end portion. A joint body having an outer surface formed thereon, which is mounted between the flare portion and the push ring, has a pressing surface that engages with the flare portion outer surface on one end side, and an annular retainer having a spline-shaped uneven outer peripheral surface on the outer surface, A flare tube having a retainer inserted therein, which comprises an annular push ring having an inner diameter that can be externally inserted into the flare end portion of the flare tube and having an uneven inner peripheral surface that can be externally inserted from the inner diameter to the uneven outer peripheral surface of the retainer. The flare joint is characterized in that a push ring is externally inserted from an end portion of the above to engage with a retainer, and the flare pipe is pressed against the tapered outer surface through the retainer to be connected.