JPH11304065A - Tube fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily connect connecting pipes to each other at an optional angle. SOLUTION: It has first and second members 5, 6 consisting of outer metal main bodies 1, 2 and plastic made inner covering bodies 3, 4 and a box nut 7 connecting these first and second members 5, 6 to each other. Additionally, a spherical surface protruded part 8 is formed on an outer peripheral surface side of the second member 6, and an annular elastic member 12 having a recessed spherical receiving surface 11 is stored in a storing hole part 10 recessively provided on an inner end side of the first member 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a pipe joint.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 7, as a pipe joint for connecting a composite pipe b having a plastic layer a to the inner surface of a metal pipe, a pair of joint members d and d connected by a cap nut c are used. Is known in which plastic cylindrical cores e and e are respectively provided inside. The end of the composite pipe b is screwed between the cylindrical core e and the joint member d to prevent rust. I am trying to do it.

[0003]

However, these conventional pipe joints for connecting connected pipes such as composite pipes can be connected only linearly, and pipes are connected at a predetermined angle to each other. Or could not.

[0004] Therefore, an object of the present invention is to provide a pipe joint which can easily connect connected pipes at an arbitrary angle.

[0005]

In order to achieve the above-mentioned object, a pipe joint according to the present invention comprises a first and a second member comprising an outer metal body and a plastic inner cover, and
In a union type pipe joint having a cap nut for connecting the second member, a spherical convex portion is formed on the outer peripheral surface side of the second member, and on the inner end side of the first member. An annular elastic member having a concave spherical receiving surface is stored in the recessed storage hole, and the concave spherical receiving surface of the elastic member and the spherical convex portion of the second member are slidably swung and compressed and fixed. It is made to contact as much as possible. Also, the inner end surface of the outer metal body of the second member is covered with an outer flange formed on the inner end of the plastic inner cover, and the outermost edge of the joining surface between the inner end surface and the outer flange is covered. Are surrounded by the concave spherical receiving surface of the elastic member in the entire range of the swing angle.

[0006] The joint surface between the inner end surface and the outer flange portion is formed in an irregularly annular shape. Further, the cross-sectional shape of the annular elastic member is formed into a substantially right-angled triangle with the concave spherical receiving surface side as the hypotenuse, and the stepped portion forming the storage hole portion of the first member is provided with an external portion of the first member. The joint between the metal main body and the plastic inner covering is exposed, and the elastic member compresses and seals. Further, in a normal tightening state in which the cap nut is screwed and the first and second members are brought close to each other and connected to each other, the inner end face of the inner flange portion of the cap nut and the inner end face of the first member are connected. A tightening gap is formed between them.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

FIGS. 1 to 6 show an embodiment of a pipe joint according to the present invention. The pipe joint comprises a first member 5 and a second member 6.
, An annular elastic member 12 and a cap nut 7.

More specifically, the first member 5 comprises an outer metal body 1 such as cast iron and an inner cover 3 made of plastic such as polyvinyl chloride or polyethylene.
Consists of an outer metal body 2 such as cast iron and an inner cover 4 made of plastic such as polyvinyl chloride or polyethylene.

The outer metal body 1 of the first member 5 has a tapered female thread portion 23 on the inner peripheral surface 22 at the outer end (as shown in FIGS. 1, 3 and 4), and the outer peripheral surface 32 at the inner end. A male screw part 33 is formed. In addition, the inner cover 3 is provided at the outer end 1 of the outer metal body 1.
a side having a cylindrical inner core 24, and an outer peripheral surface 25 of the core 24.
And a spiral small ridge 26. The female screw portion 23 of the outer metal body 1 and the small ridge 26 of the inner cover 3 are separated, and an anticorrosion pipe (not shown) is inserted and connected therebetween.

The outer metal body 2 of the second member 6 has an inner peripheral surface at the outer end.
27 has a female screw portion 28 having a tapered shape. In addition, the inner cover 4 is provided on the outer end 2 a side of the outer metal body 2 with a cylindrical inner core.
The inner core 29 has a spiral small ridge 31 formed on an outer peripheral surface 30 thereof. Female thread 28 of external metal body 2
And the small ridge 31 of the inner cover 4 are separated from each other, and an anticorrosion pipe (not shown) is inserted and connected therebetween.

Further, the first member 5 has a storage hole 10 on the inner end side, and has an annular elastic member (described later) having a concave spherical receiving surface 11.
12 is housed in the housing hole 10. This elastic member 12
Is made of synthetic rubber, soft plastic, or the like. Further, a spherical convex portion 8 is formed on the inner end outer peripheral surface side of the second member 6. By connecting the first and second members 5 and 6 to each other by the cap nut 7, the concave spherical receiving surface 11 of the elastic member 12 and the spherical convex portion 8 can be relatively swung and compressed and fixed. Abut. In other words, when the cap nut 7 is loosely tightened, the sliding swing can be performed (as shown in FIG. 2), and when the cap nut 7 is properly tightened, the cap nut 7 is compressed and fixed.

Also, (as shown in FIGS. 1, 2 and 6)
The cap nut 7 has, on the inner peripheral surface, a female screw portion 34 that is screwed into the male screw portion 33 of the first member 5. The inner peripheral surface 35 of the inner flange portion 19 of the cap nut 7 is formed in a concave curved surface shape corresponding to the spherical convex portion 8 of the second member 6 or in an outwardly tapered diameter shape. The second member 6 can be fixed at a desired swing angle or a straight state. Also, at the time of tightening with the cap nut 7 (in the normal tightened state shown in FIGS. 1 and 2).
─, the spherical center O ₈ of the spherical projection 8 of the second member 6 is located inside the outer end face 19 a of the inner flange 19 of the cap nut 7. By doing so, the inner diameter of the inner flange portion 19 of the cap nut 7 can be minimized, and another ring body can be omitted.

The cap nut 7 is screwed into the first and second members 5,
6 in the normal tightened state where they are connected close to each other,
A tightening gap 21 is formed between the inner end surface 20 of the inner flange portion 19 of the cap nut 7 and the inner end surface 9 of the first member 5. Thereby, when the elastic force of the annular elastic member 12 decreases after a long use period, retightening becomes possible.

The inner end surface 13 of the outer metal body 2 of the second member 6
Is covered with an outer flange portion 14 formed on the inner end of the plastic inner cover 4, and is a joining surface between the inner end surface 13 and the outer flange portion 14.
The outermost edge 16 of 15 is the entire range of the swing angle, for example, 0 °.
At an angle of about 15 °, the concave spherical receiving surface of the elastic member 12
At 11, it is configured to be surrounded. Thus, when the cap nut 7 is tightened, the second member 6 and the annular elastic member
12 is sealed, thereby preventing external leakage of the fluid during use. Further, the joining surface 15 is formed in an irregular annular shape. For example, in FIGS. 1, 2 and 4, an annular concave groove 37 is formed on the inner end surface 13 of the outer metal main body 2, and the outer flange portion 14 is formed.
And the joint strength has been increased. Note that the annular ridge is
13 (not shown).

The cross-sectional shape of the annular elastic member 12 is formed in a substantially right triangular shape having the concave spherical receiving surface 11 side as an oblique side. The joint 18 between the outer metal body 1 of the first member 5 and the plastic inner cover 3 faces the stepped portion 17 forming the storage hole 10 of the first member 5, and is compressed and sealed by the elastic member 12. It is configured as follows.

[0017]

Since the present invention is configured as described above,
It has the following significant effects.

The first and second members 5, 6 can be easily disassembled and assembled (even in the field) by screwing and retracting the cap nut 7 (according to claim 1). Then, even when the axes of the two tubes to be connected to each other are not on the same line and have a predetermined angle, the tubes can be connected to each other. Therefore, piping work on site can be performed easily and quickly. Furthermore, even when the connected pipe forms a predetermined angle,
The fluid such as water is a plastic inner coating 3,
4 and the ring-shaped elastic members 12 such as synthetic rubber are in contact with each other, and the metal bodies 1 and 2 are not in contact with each other. Also, when a large force acts from outside during an earthquake,
It is absorbed by the swing and damage of the pipe joint can be prevented.

According to the second aspect of the present invention, the space between the joint surface 15 and the annular elastic member 12 is sealed, and in use, the fluid flows to the outside through the back surface of the inner cover 4 (joint portion with the external metal body 2). Leakage can be prevented.

According to the third aspect, the external end received from the annular elastic member 12 when the cap nut 7 is strongly tightened, or the external force during use, or the like, causes the inner end surface 13 of the external metal main body 2 to be closed.
On the other hand, the displacement of the outer flange portion 14 of the plastic inner covering 4 causes the joining surface 15 to separate, thereby preventing a fluid such as water from penetrating there and preventing external leakage.

According to the fourth aspect, leakage of a fluid such as water from the joining surface 18 to the outside can be prevented. According to claim 5, when the annular elastic member 12 deteriorates after a long period of use and the elastic force decreases, retightening becomes possible.

[Brief description of the drawings]

FIG. 1 is a sectional front view showing a use state.

FIG. 2 is a sectional front view showing a use state.

FIG. 3 is a sectional front view showing a first member.

FIG. 4 is a sectional front view showing a second member.

FIG. 5 is a sectional front view showing an annular elastic member.

FIG. 6 is a sectional front view showing a cap nut.

FIG. 7 is a sectional front view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 External metal main body 2 External metal main body 3 Inner cover 4 Inner cover 5 1st member 6 2nd member 7 Cap nut 8 Spherical convex part 9 Inner end face 10 Storage hole part 11 Concave spherical receiving surface 12 Annular elastic member 13 End surface 14 Outer flange 15 Joint surface 16 Outermost edge 17 Stepped portion 18 Joint 19 Inner flange 20 Inner end surface 21 Gap for tightening

Claims (5)

[Claims] 1. First and second members (5, 6) comprising outer metal bodies (1, 2) and plastic inner coverings (3, 4), and cap nuts (7) for connecting the first and second members (5, 6). In the union type pipe joint having the following, a spherical convex portion 8 is formed on the outer peripheral surface side of the second member 6, and a storage hole portion recessed on the inner end side of the first member 5. An annular elastic member 12 having a concave spherical receiving surface 11 is housed in 10, and the concave spherical receiving surface 11 of the elastic member 12 and the spherical convex portion 8 of the second member 6 are swung.
A pipe joint characterized by being abutted so as to be capable of being fixed by compression. 2. The inner end surface 13 of the outer metal body 2 of the second member 6.
Is covered with an outer flange portion 14 formed on the inner end of the plastic inner covering body 4, and a joining surface 15 between the inner end surface 13 and the outer flange portion 14 is formed.
The outermost edge 16 of the elastic member is an elastic member in the entire range of the swing angle.
The pipe joint according to claim 1, wherein the pipe joint is configured to be surrounded by the concave spherical receiving surface (12). 3. The pipe joint according to claim 2, wherein the joining surface 15 between the inner end surface 13 and the outer flange portion 14 is formed in an uneven annular shape. 4. The cross-sectional shape of the annular elastic member 12 is formed into a substantially right-angled triangular shape having the concave spherical receiving surface 11 side as an oblique side.
The outer metal body 1 of the first member 5 and the joining portion 18 of the plastic inner cover 3 face the stepped portion 17 forming the storage hole 10 of the member 5, and the first member 5 is compressed and sealed by the elastic member 12. 4. The pipe joint according to claim 1, wherein the pipe joint is configured as described above. 5. An inner end face 20 of an inner flange portion 19 of the cap nut 7 in a properly tightened state in which the cap nut 7 is screwed and the first and second members 5, 6 are brought close to each other and connected. A tightening gap (21) is formed between the first member (5) and the inner end surface (9) of the first member (5).
The pipe joint according to 2, 3, or 4.