JP3717145B2 - Pipe fitting - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a pipe joint, and more particularly to a pipe joint for connecting, for example, a resin pipe and a metal pipe.
[0002]
[Prior art]
Two types of conventional pipe joints of this type are used: a type that is fixed by a ring (hereinafter referred to as “ring type”) and a type that is fixed by caulking (hereinafter referred to as “caulking type”). I came.
[0003]
For example, as disclosed in Japanese Patent Application Laid-Open No. 07-151281, a ring-type pipe joint is formed with locking portions on the outer peripheral surface of a joint body made of metal and the inner peripheral surface of a ring, and these surfaces The resin tube is sandwiched and fixed by a stopper).
[0004]
A caulking type pipe joint is inserted into a groove by forming a groove in a metal joint body and caulking the outer surface portion of the groove to reduce the diameter, as disclosed in, for example, Japanese Patent Application Laid-Open No. 09-178074. The resin tube is fixed.
[0005]
[Problems to be solved by the invention]
In the prior art, both the ring type and the caulking type have a problem that they are difficult to manufacture and expensive because of their complicated structures. In particular, in the caulking type, as shown in FIG. 11, it is necessary to reduce the thickness of the outer surface portion 2 in order to fix the resin pipe 3 by caulking the outer surface portion 2 of the groove 1. Processing was difficult. Further, in the caulking die, it is difficult to ensure the strength of the outer surface portion 2, and the removal prevention force and the rotation prevention force of the resin pipe 3 with respect to the joint body 4 are insufficient.
[0006]
Therefore, a main object of the present invention is to provide a pipe joint that is easy to manufacture and that has high anti-falling performance and anti-rotation performance.
[0007]
[Means for Solving the Problems]
This invention includes a cylindrical main body made of metal, a stopper formed to protrude from the outer surface of one end of the main body, a raised portion formed at the outer surface of the other end of the main body, and one end fitted to the outer peripheral surface of the main body. A pipe joint including a resin pipe locked to a stopper, and a ring that is fitted to the outer peripheral surface of the resin pipe and crimps the resin pipe to a raised portion.
[0008]
[Action]
When the resin tube is fitted to the outer peripheral surface of the main body, one end of the resin tube is locked to the stopper. In addition, the other end of the resin tube is expanded in diameter by the raised portion of the main body, and an inclined portion is formed at a location where the non-diameter expanded portion of the resin tube is shifted to the expanded diameter portion. Therefore, when fitting a ring having an inner diameter smaller than the outer diameter of the enlarged diameter part to the outer peripheral surface of the resin pipe (expanded diameter part), the ring is forced to the enlarged diameter part side along the outer surface of the inclined part. Can be pushed in. The ring fitted to the resin tube (expanded portion) is compressed by tightening the expanded portion, and the inner peripheral surface is crimped to the outer surface of the raised portion, so that the resin tube is firmly fixed to the raised portion. It will be.
[0009]
Further, when a rough surface is formed on the outer surface of the raised portion, the rough surface functions as a slip stopper for the resin pipe.
[0010]
【The invention's effect】
According to the present invention, since the main body and the resin tube are firmly coupled, it is possible to obtain high slip prevention performance and rotation prevention performance. In addition, since the shapes of the main body, the resin tube, and the ring can be simplified, manufacturing is facilitated and costs can be reduced.
[0011]
The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.
[0012]
【Example】
Referring to FIGS. 1 and 2, a pipe joint 10 of this embodiment is made of, for example, a saddle 14 with a saddle shown in FIG. 4 and a saddle 14 made of polyolefin resin such as polyethylene and a metal such as copper alloy. It is for connecting to the water faucet 16, and includes a cylindrical main body 18, a resin tube 20 fitted to the outer peripheral surface of the main body 18, and a ring 22 fitted to the outer peripheral surface of the resin tube 20.
[0013]
The main body 18 is made of a metal such as a copper alloy and includes a short pipe portion 24. The length of the short pipe portion 24 is set to be sufficiently longer than the connection port 14a of the saddle 14, and the inner diameter of the short pipe portion 24 is set so as to ensure a sufficient flow path cross-sectional area. A flange-like stopper 26 having a tapered surface 26 a is formed to protrude from the outer surface of one end portion of the short tube portion 24, and a raised portion 28 is formed on the outer surface of the other end portion of the short tube portion 24. An inclined surface 28a having an enlarged diameter in the fitting direction of the resin tube 20 is formed at the end of the raised portion 28, and a rough surface 30 is formed on the outer surface of the raised portion 28 by a plurality of protrusions 30a extending in the circumferential direction. Is done.
[0014]
Further, a groove 32 is formed on the outer peripheral surface of one end of the short tube portion 24, and an O-ring 34 is attached to the groove 32.
[0015]
Furthermore, a flange 36 is formed on the outer surface of the other end portion of the short pipe portion 24 so as to rise from the end portion of the raised portion 28, and a female screw into which the connection port 16 a of the water faucet 16 is screwed on the inner surface of the other end portion. 38 is formed.
[0016]
The resin tube 20 is made of a polyolefin-based resin such as polyethylene, and the inner diameter thereof is set slightly smaller than the outer diameter of the main body 18 (short pipe portion 24), and the outer diameter is on the outer peripheral surface of the main body 18 (short pipe portion 24). When fitted, the connection port 14a is set to have substantially the same size as the inner diameter, and the length thereof is set to be approximately the same as the distance between the stopper 26 and the flange 36 in the main body 18.
[0017]
The ring 22 is made of a material that is not easily deformed, such as stainless steel or polyacetal, and its inner diameter is set slightly smaller than the outer diameter of the resin tube 20 expanded by the raised portion 28, and its width is the width of the raised portion 28. Is set to approximately the same size.
[0018]
When assembling the pipe joint 10, as shown in FIG. 3, the main body 18 and the inclined surface forming member 42 are first attached to the jig 40. Then, the resin pipe 20 is expanded along the inclined surface 44 formed by the stopper 26 and the inclined surface forming member 42, and this is fitted to the outer peripheral surface of the main body 18. At this time, the resin pipe 20 extends beyond the stopper 26 while expanding the diameter, but when the resin pipe 20 exceeds the stopper 26, the resin pipe 20 tends to shrink to the original diameter. Therefore, after the resin tube 20 is fitted, the inner surface of the resin tube 20 is in close contact with the outer peripheral surface of the main body 18.
[0019]
The resin tube 20 fitted to the main body 18 in this manner is in a state where one end is locked by the stopper 26 and the other end is expanded in diameter due to the raised portion 28. In addition, an inclined portion 50 is formed on the outer surface of the portion of the resin pipe 20 that transitions from one end (non-diameter portion 46) to the other end (diameter portion 48). Although the resin tube 20 has a property of naturally shrinking to the original shape as described above, the shrinkage may be promoted by heating the resin tube 20 after being attached to the main body 18.
[0020]
After the resin pipe 20 is fitted to the main body 18, the ring 22 is fitted from one end of the main body 18 to the outer peripheral surface of the resin pipe 20 (expanded diameter portion 48). The inner diameter of the ring 22 is set to be smaller than the outer diameter of the enlarged diameter portion 48, but since the inclined portion 50 is formed, the ring 22 is placed on the outer surface of the enlarged diameter portion 48 along the outer surface of the inclined portion 50. Can be pushed in. When the ring 22 is pushed into the enlarged diameter portion 48 of the resin tube 20, the enlarged diameter portion 48 of the resin tube 20 is compressed by the ring 22, and the inner peripheral surface of the resin tube 20 is pressure-bonded to the outer surface of the raised portion 28. Cut into 30 ridges.
[0021]
When this pipe joint 10 is used, as shown in FIG. 4, one end of the pipe joint 10 is inserted into the connection port 14a of the saddle 14, and the heater 52 embedded in the connection port 14a is energized and connected. The opening 14a and the resin tube 20 are fused. Then, the connection port 16 a (male screw 54) of the water faucet 16 is screwed into the female screw 38 formed on the inner peripheral surface of the other end portion of the pipe joint 10.
[0022]
According to this embodiment, since the resin tube 20 is firmly fixed to the main body 18 by the locking by the stopper 26, the crimping by the ring 22, and the slip prevention by the rough surface 30, the high slip prevention performance and the rotation prevention performance. Can be obtained.
[0023]
In the above-described embodiment, the tapered surface 26a is formed on the outer periphery of the stopper 26, but the outer periphery of the stopper 26 may be formed in a straight shape as shown in FIG. In this case, as shown in FIG. 6, the outer diameter of the end portion on the enlarged diameter side of the inclined surface forming member 42 is set to be substantially the same as or larger than the outer diameter of the stopper 26, and the resin tube 20 is formed on the inclined surface. This is fitted to the outer peripheral surface of the main body 18 while expanding the diameter along the line.
[0024]
Moreover, in the above-mentioned Example, although the water-stopping property is improved using the O-ring 34, when there is no fear of water leakage, as shown in FIG. 7, it is not necessary to attach an O-ring. Further, in the above-described embodiment, the rough surface 30 as a slip stopper is formed on the outer surface of the raised portion 28. However, when sufficient bonding strength can be obtained only by the crimping force by the ring 22, FIG. As shown in FIG. 4, it is not necessary to form a rough surface.
[0025]
Moreover, the shape of the rough surface 30 may be other shapes useful for preventing slippage, and may be, for example, a knurled shape as shown in FIG. 8A or a large number of protrusions as shown in FIG.
[0026]
A pipe joint 60 of another embodiment shown in FIG. 9 is for connecting a resin pipe 62 made of polyolefin resin and a metal pipe 64 made of iron or the like. In the pipe joint 60, the flange 36 in the pipe joint 10 shown in FIG. 1 is formed long in the axial direction, a receiving port 66 for receiving the metal pipe 64 is formed on the inner surface, and a female screw 68 is formed on the inner surface of the receiving port 66. Is.
[0027]
When using the pipe joint 60, the resin pipe 20 and the resin pipe 62 are connected using the electric fusion joint 70, and the male screw 72 of the metal pipe 64 is screwed into the female screw 68.
[0028]
A pipe joint 74 of another embodiment shown in FIG. 10 is for connecting the resin pipe 62 and another resin pipe 76 (such as a polyolefin resin pipe or a vinyl chloride pipe). The pipe joint 74 extends in the axial direction from the end portion of the flange 36 in the pipe joint 10 shown in FIG. 1 to form a male threaded portion 78, and a receiving port 80 for receiving the resin pipe 76 is formed on the inner surface thereof. The tightening ring 82 is inserted into the male screw portion 78 and the cap nut 84 is screwed into the male screw portion 78.
[0029]
When using the pipe joint 74, the in-core 86 is inserted into the end portion of the resin pipe 76, the resin pipe 76 is inserted through the cap nut 84 and the fastening ring 82, and then inserted to the back of the receiving port 80. . Then, the cap nut 84 is screwed into the male screw portion 78. Then, the tightening ring 82 is pressed against the tapered surface 80 a formed on the inner surface of the receiving port 80 by the cap nut 84 to reduce the diameter, and the resin tube 76 is sandwiched and fixed by the tightening ring 82 and the incore 86. The
[0030]
In these embodiments as well, as in the embodiment of FIG. 1, high slip prevention performance and rotation prevention performance can be obtained.
[Brief description of the drawings]
FIG. 1 is an illustrative view showing one embodiment of the present invention;
FIG. 2 is an exploded perspective view of the embodiment of FIG.
FIG. 3 is an illustrative view showing an assembling method of the embodiment in FIG. 1;
4 is an illustrative view showing a use state of the embodiment in FIG. 1; FIG.
FIG. 5 is an illustrative view showing another embodiment of the present invention.
6 is an illustrative view showing an assembling method of the embodiment in FIG. 5; FIG.
FIG. 7 is an illustrative view showing another embodiment of the present invention.
FIG. 8 is a perspective view showing a modified example of a rough surface.
FIG. 9 is an illustrative view showing another embodiment of the present invention.
FIG. 10 is an illustrative view showing another embodiment of the present invention.
FIG. 11 is an illustrative view showing a conventional technique.
[Explanation of symbols]
10, 60, 74 ... pipe joint 18 ... main body 20 ... resin pipe 22 ... ring 26 ... stopper 28 ... raised portion 30 ... rough surface

Claims (2)

A cylindrical body made of metal,
A stopper formed to protrude from the outer surface of one end of the main body,
A raised portion formed on the outer surface of the other end of the main body,
A pipe joint comprising: a resin pipe fitted to the outer peripheral surface of the main body and having one end locked to the stopper; and a ring fitted to the outer peripheral face of the resin pipe to press-fit the resin pipe to the raised portion. . The pipe joint according to claim 1, wherein a rough surface is formed on an outer surface of the raised portion.

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