JPH0562787U - Pipe fitting - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a pipe joint in which a metal flange main body and a resin anticorrosion core are securely fixed, and which also have excellent anticorrosion properties and sealing performance. [Configuration] A metal flange body 1 and a resin anticorrosion core 2 are provided. On the inner peripheral surface 6 of the hole 5 of the metal flange body 1, a threaded portion 7 for the connected pipe and a threaded portion 8 for the anticorrosion core are formed. When the anticorrosion core 2 is screwed into the anticorrosion core screw portion 8 of the flange body 1, the outer flange portion 13 of the anticorrosion core 2 is fitted into the large diameter portion 10 of the end portion of the hole 5 of the flange body 1, Moreover, the adhesive reservoir 20 is formed on a part of the contact portion 19 of the flange body 1 with which the back surface 18 of the outer collar portion 13 of the anticorrosion core 2 contacts.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pipe joint.

[0002]

[Prior Art]

 As a pipe joint for connecting a pipe to be connected having an anticorrosion resin layer inside, a pipe joint having a pipe portion having a screw portion for the pipe to be connected in a hole and a connecting flange portion protruding from the pipe portion is used. Was known.

However, even with this pipe joint, as with the pipe to be connected, it was necessary to take anticorrosion measures.

Therefore, a pipe joint provided with a metal flange main body having a threaded portion for the connected pipe on the inner peripheral surface of the hole and a resin anticorrosion core fixed to the flange main body has been proposed.

[0005]

[Problems to be solved by the device]

 In the pipe joint including the metal flange main body and the resin anticorrosion core described above, the resin anticorrosion core is formed by injection molding and integrated with the metal flange main body.

Therefore, in this case, the resin anticorrosion core may contract and easily come off the metal flange body.

Therefore, it is an object of the present invention to provide a pipe joint in which the metal flange main body and the resin anticorrosion core are securely fixed and which is excellent in sealing property.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, a pipe joint according to the present invention is provided with a metal flange main body having a threaded portion for a pipe to be connected and a threaded portion for an anticorrosion core on an inner peripheral surface of a hole, and an anticorrosion of the flange body. A pipe joint provided with a resin anticorrosion core that is screwed to a core screw part and has an outer flange part fitted to a large diameter part of an end of a hole of the flange body, the outer flange of the anticorrosion core. An adhesive reservoir is provided at a part of the contact portion of the metal flange body with which the back surface of the portion contacts.

[0009]

[Action]

 The resin anticorrosion core and the metal flange body are integrated by screwing the resin anticorrosion core onto the thread portion of the metal flange body for the anticorrosion core.

Further, in order to increase the mounting strength, an adhesive is applied to the screw portion for the anticorrosion core, etc., but when the anticorrosion core is screwed onto the flange main body, the excess adhesive that has been pressed causes the above-mentioned contact portion to come out. It collects in the adhesive collection part provided in a part and solidifies.

Therefore, excess adhesive does not leak out through the space between the back surface of the outer flange portion of the anticorrosion core and the contact portion of the flange body, and the adhesive strength is increased.

[0012]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the drawings illustrating an embodiment.

1 and 2 show a pipe joint according to the present invention, which comprises a metal flange main body 1 and a resin anticorrosion core 2 fixed to the flange main body 1.

The metal flange main body 1 is composed of the tubular portion 3 and the mounting flange portion 4 protruding from the tubular portion 3 in an outer flange shape, and the inner peripheral surface of the hole 5 is formed. 6, a threaded portion 7 for connection and a threaded portion 8 for anticorrosion core are formed.

That is, the hole portion 5 of the flange body 1 is composed of a tapered hole portion 9 and a large diameter end portion 10, and the tapered hole portion 9 has a threaded portion 7 for the connected pipe and a threaded portion 8 for the anticorrosion core. And are formed. Specifically, the tapered hole portion 9 is opened to the one end surface 1a of the flange body 1, the one end surface 1a side has a large diameter, and the anticorrosion core screw portion 8 is formed on the other end surface 1b side on the small diameter side. ..

The resin anticorrosion core 2 is composed of a cylindrical portion 12 and an outer flange portion 13 protruding from the base end of the cylindrical portion 12, and the outer flange portion 13 is a hole portion of the flange body 1. Fit the large diameter part 10 at the end of 5.

That is, the cylindrical portion 12 of the anticorrosion core 2 includes a large diameter portion 14 at the base end and a small diameter portion 15 having a diameter smaller than that of the large diameter portion 14. A connecting screw portion 16 that is screwed into the screw portion 8 is provided.

On the outer peripheral surface of the small-diameter portion 15 of the cylindrical portion 12, a threaded or independent ring-shaped small ridge 11 is provided.

When the joining screw portion 16 is screwed into the anticorrosion core screw portion 8, the outer flange portion 13 is fitted into the large diameter portion 10 of the hole portion 5 and the small diameter portion of the cylindrical portion 12 is fitted. A gap 17 is formed between the outer peripheral surface of the portion 15 and the threaded portion 7 for connecting pipe.

In addition, as shown in FIG. 1, an adhesive reservoir 20 is formed on a part of the contact portion 19 of the metal flange body 1 with which the back surface 18 of the outer flange portion 13 of the anticorrosion core 2 contacts. ..

Specifically, the adhesive agent reservoir 20 is composed of a circumferential groove 21 provided in the central portion of the contact portion 19 and a part of the back surface 18 facing the groove 21. The peripheral surface and the outer peripheral surface are sequentially expanded toward the back surface side of the anticorrosion core 2.

That is, when the flange main body 1 and the anticorrosion core are screwed together, the adhesive S is interposed between the anticorrosion core screw portion 8 and the joining screw portion 16, and when screwing, The adhesive S is pressed and tries to leak out, but the adhesive S accumulates in the adhesive reservoir 20 and does not leak out.

However, as shown in FIG. 4, if the adhesive does not have an accumulating portion, the screw portion b for joining the resin anticorrosion core a is replaced with the screw portion d for the anticorrosion core of the metal flange body c. If the screw is screwed into the outer flange portion e of the anticorrosion core a between the rear surface f and the contact portion g with which the rear surface f contacts, and the outer peripheral surface h of the outer collar portion e and the hole i of the flange body c. There is a possibility that the adhesive may leak out from the portion a through the inner surface k of the large diameter portion j of the end portion.

When the adhesive is squeezed out to the outside, a convex portion is formed by the squeezed adhesive on the outer end surface m of the anticorrosion core a and the end surface n of the metal flange main body c, and the sealing function is deteriorated. become.

That is, when connecting a pair of pipes to be connected, a pair of pipe joints are used, and a sealing material is interposed between the outer end faces m, m to the end faces n, n of the pair of pipe joints. This is for connecting pipe joints, and if there are convex portions on the outer end face m and the end face n, the sealing function will be deteriorated.

On the other hand, if the adhesive reservoir 20 is provided as in the present invention so that the adhesive S is not squeezed out from the portion (a), the outer end surface 22 of the anticorrosion core 2 and the metal flange main body No convex portion is formed by the adhesive S on the mating surface 23 composed of the other end surface 1b of the connector 1. When mating the pair of connected pipes 24, 24, the mating surface 23 is a sealing material (interposing between the mating surfaces). It securely adheres to the body) and exhibits an excellent sealing function.

The connected pipe 24 connected to this pipe joint is composed of a metal pipe body 25 and an anticorrosion resin layer 26 attached to the inner surface of the metal pipe body 25. On the outer peripheral surface of the end of the main body 25, an end male screw portion 27 that is screwed into the threaded portion 7 for the connected pipe of the metal flange body 1 is formed.

Further, the small protrusions 11 of the anticorrosion core 2 are set to have a size that makes contact with the inner surface of the resin layer 26 of the connected pipe 24.

That is, when the male screw portion 27 of the connected pipe 24 is screwed into the screw portion 7 for the connected pipe, the end portion of the connected pipe 24 enters the gap 17 and the resin layer of the connected pipe 24. The small ridges 11 gradually dig into the inner peripheral surface of the 26, or the small ridges 11 themselves are crushed. In addition, in FIG. 2, 30 is a through hole for connection.

Therefore, when the pair of connected pipes 24, 24 are connected using the pair of pipe joints configured as described above, in the connected state, the entire inner peripheral surface of the formed flow path is made of resin. As it is coated, it can exhibit an excellent anticorrosion effect.

The resin anticorrosion core 2 is made of hard vinyl chloride or the like, an epoxy resin adhesive or the like is used as the adhesive S, and the adhesive solidified portion formed in the adhesive reservoir 20 is made of resin. It is integrated with the anticorrosion core 2, and a concave peripheral portion 28 is formed on the back surface 18 side of the anticorrosive core 2, and the projection 29 of the flange body 1 is fitted into the concave peripheral portion 28. ..

Therefore, this can effectively prevent the anticorrosion core 2 from shrinking in the inner diameter direction.

Next, using the pipe joint shown in FIGS. 1 and 2 and the pipe joint shown in FIG. 4, an adhesive strength test of the resin anticorrosion core 2 was performed.

Here, the adhesive strength test was carried out by placing 10 pipe joints of each of two types in an environment of −15 ° C. and + 60 ° C. every half day, and repeating this for 30 days.

As a result, in the pipe joint according to the present invention, none of the ten anticorrosion cores 2 was detached from the flange body 1 in 30 days, whereas in the pipe joint shown in FIG. Within 2 days, the anticorrosion cores of 2 pipe fittings were removed from the flange body, within 10 days, another 6 pipe fittings anticorrosion cores were removed, and within 15 days all 10 pipe fittings anticorrosion cores were removed. ..

Therefore, the pipe joint according to the present invention is excellent in durability without the anticorrosion core 2 peeling from the flange body 1 even when the temperature changes excessively.

Next, FIG. 3 shows another embodiment. In this case, the large-diameter end portion 10 of the hole portion 5 of the metal flange body 1 has a circular recess 10a and a circumferential direction provided on the outer peripheral side thereof. It consists of the groove 10b. The large-diameter end portion 10 has an inverted L-shaped cross section.

A circumferential recess 33 is provided on the back surface of the outer flange 13 of the resin anticorrosion core 2, and when the anticorrosion core 2 is screwed into the flange body 1, the outer flange 13 extends in the circumferential direction. The protrusion 32 fits into the circumferential groove 31.

Further, the projecting dimension of the projecting portion 32 is set smaller than the depth dimension of the circumferential groove 31, and a gap portion is formed in the circumferential groove 31. That is, this gap portion serves as an adhesive agent reservoir portion 20 formed on a part of the contact portion 19 of the metal flange main body 1 with which the back surface 18 of the outer flange portion 13 of the anticorrosion core 2 contacts.

Therefore, also in this case, as in the above-described embodiment, the adhesive S does not squeeze out from the portion a, the convex portion of the adhesive S is not formed on the mating surface 23, and the pair of connected pipes is not connected. When 24 and 24 are connected, the mating surfaces 23 and 23 surely adhere to the sealing material.

Further, according to this embodiment, the circumferential projection 34 of the flange body 1 is fitted in the recess 33, and effectively prevents the anticorrosion core 2 from shrinking in the inner diameter direction.

Further, the inner peripheral surface of the anticorrosion core 2 is provided with recesses 35 arranged at a predetermined pitch along the circumferential direction. This is a locking portion used when the anticorrosion core 2 is screwed into the flange body 1.

Although the recess 35 is omitted in FIG. 1, it is of course preferable to provide the recess 35. Further, in the embodiment shown in FIG. 3, the small protrusion 11 of the cylindrical portion 12 of the anticorrosion core 2 is not shown, but of course, the small protrusion 11 is preferably provided.

It should be noted that the present invention is not limited to the above-described embodiment, and the design can be freely changed without departing from the scope of the present invention. For example, the position of the adhesive reservoir 20 is the contact portion 19 of the metal flange body 1. However, it is preferably provided on the outer diameter side. This is because if the adhesive is provided on the inner diameter side, there is a risk that the adhesive may leak to the outside through the pool 20.

The connected pipe threaded portion 7 and the anticorrosion core threaded portion 8 may be either screw in the same direction or left / right reverse screw, but if left / right reverse screwed, the connected pipe 24 is made of metal. When the threaded portion 7 for the connected pipe of the manufacturing flange body 1 is screwed, it tries to rotate in the same direction as the rotating direction of the connected pipe 24, but the anticorrosion core 2 facing the connected pipe 24 also advances. It is preferable that the anticorrosion core 2 is further tightened without being loosened because the anticorrosion core 2 is rotated in the direction of rotation.

Further, the number of reservoirs 20 need not be limited to one.

[0047]

[Effect of the device]

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

When the resin anticorrosion core 2 is screwed onto the anticorrosion core screw portion 8 of the metal flange body 1, the adhesive S applied to the anticorrosion core screw portion 8 or the like is placed in the adhesive reservoir 20. The mating surface 23 of this pipe joint is not impaired in its planar state, and exhibits an extremely excellent sealing function in the connected pipe connection state.

Moreover, in this pipe joint, the solidified adhesive S in the adhesive reservoir 20 increases the adhesive strength of the outer flange portion 13, prevents the core 2 from shrinking, and is extremely excellent in durability. It becomes a thing.

In addition, in the connected state of the pair of connected pipes 24, 24, the entire inner peripheral surface of the formed flow path is covered with resin, and an excellent anticorrosion effect is exhibited.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of an essential part showing an embodiment of the present invention.

FIG. 2 is a sectional view.

FIG. 3 is an enlarged cross-sectional view of a main part of another embodiment.

FIG. 4 is a cross-sectional view showing a comparative example.

[Explanation of symbols]

 1 Metal flange main body 2 Resin anticorrosion core 5 Hole 6 Inner peripheral surface 7 Threaded part for pipe to be connected 8 Threaded part for anticorrosion core 10 Large diameter end 13 Outer flange 18 Back surface 19 Contact part 20 Adhesive reservoir

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takao Miyake 75 Nojiri, Ritto-cho, Kurita-gun, Shiga Sekisui Chemical Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A threaded portion 7 for a connected pipe is provided on an inner peripheral surface 6 of a hole portion 5.
And metal flange body 1 having a screw portion 8 for the anticorrosion core
And the outer flange portion 13 is screwed to the anticorrosion core screw portion 8 of the flange body 1 so that the outer flange portion 13 has a large diameter portion 10 at the end of the hole 5 of the flange body 1.
A resin-made anticorrosion core 2 that fits into a part of a contact portion 19 of the metal flange main body 1 with which a back surface 18 of an outer flange portion 13 of the anticorrosion core 2 comes into contact, A pipe joint having an adhesive reservoir 20.