JP2676494B2 - Electrofusion joint joint fitting retaining method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a retaining how the joint fitting of the resin in the pipe system of the water and sewage or gas (thermoplastic resin) products and electro fusion fitting used for connecting the metal products (hereinafter referred to as EF joint) Regarding

[0002]

2. Description of the Related Art Conventionally, for example, in an EF joint for connecting a flowmeter to a resin pipe, a conductive wire for fusing is buried in a contact surface with the resin pipe, and a joint fitting is integrally attached to a receiving port for connecting a pressure gauge. Has been done. In order to prevent the joint metal fitting from coming off, the joint surface between the EF joint and the joint metal fitting is formed intricately (uneven surface), or Admer which is a substitute adhesive between the resin layer of the EF joint and the metal layer of the joint metal fitting. (Product name) A resin layer was formed.

[0003]

The conventional retaining of the joint metal fittings does not require a dedicated working time and does not appear in the appearance and does not impair the aesthetic appearance, but it has low strength and does not leak or separate. There was probably a risk of, and there was a problem that became more prominent as the days passed.

[0004] The present invention is not required a dedicated work effort and without impaired aesthetic appearance and, moreover strength strongly, when obtaining there is no risk of leakage or separation EF joint joints metal fitting co
To, any size, and its object is to provide a retaining method of the EF joint joint bracket that can be applied even to a joint bracket shape.

[0005]

In order to achieve the above object, as a method for retaining an EF joint joint fitting using a caulking ring, a method of attaching a caulking ring together with a conductive wire of an EF joint and a joint fitting is used. A fluidized molding material is press-fitted into it, a conductive wire is embedded in the contact surface with the resin product, and an EF joint is integrally attached with a caulking ring together with a joint fitting, and after that caulking the caulking ring. It is a thing.

[0006]

[Operation] Since the above caulking ring is attached together with the joint metal fittings at the time of molding the EF joint, it is possible to caulk the joint metal fitting having an outer diameter larger than the inner diameter of the caulking ring,
In addition, there is no gap between the EF joint and the caulking ring, and the specified amount of deformation can be obtained with a minimum amount of deformation, which can suppress the strength reduction of the caulking ring to a minimum, and the endless caulking ring can provide a uniform force. It can be caulked, a high retaining strength can be obtained, and the strength can be maintained for a long time.

The caulking ring is a simple metal ring .
By doing so, the structure is simple, the cost is low, and the aesthetic appearance can be prevented from being impaired.

It is to be noted that in the prior art, the joint surface between the EF joint and the joint metal fitting is complicated, or an Admer (trade name) resin layer which is a substitute adhesive is formed between the resin layer of the EF joint and the metal layer of the joint metal fitting. It is more effective to use the retaining means and the retaining device of the present invention together.

[0009]

Embodiments will be described with reference to the drawings.
In the figure, (1) is a sleeve-shaped EF joint, and one end side thereof is a joint fitting for connecting metal products (metal pipes, various valves, various instruments, other pipe accessories, etc.) in the piping system (2). (3) is attached integrally, and EF joint (1)
Resin products (resin pipes) in piping systems to be fused to (4)
And the metal product (2) are connected to each other.

In the EF joint (1), a conductive wire (6) is embedded in the contact surface with the resin product (4), that is, the peripheral surface of the receptacle (5) at one end of the EF joint (1) into which the resin product (4) is inserted. It is crowded. A bulging portion (7) is provided on the outer surface of the EF joint (1) on the outer periphery of the receiving port (5), and a pair of pin holes (8) for connecting a power connector are formed in the bulging portion (7), and A pair of connector pins (9) to be connected to each end of the conductive wire (6) are fixed in the pin holes (8).

Then, the resin product (4) is inserted into the receiving opening (5) until the insertion end face comes into contact with the insertion amount regulating surface (10) at the bottom of the receiving opening (5), and then the conductive wire (6). Energize,
The EF joint (1) and the resin product (4) are fused by heating and melting the contact surface.

Further, a through hole (11) reaching the conductive wire (6) from the outer surface of the EF joint (1) is provided, and the hole (11).
By visually confirming the molten resin flowing out from the structure, the fusion state is determined, and the electric current to the conductive wire (6) is continued or cut off.

The joint fitting (3) is formed by integrally forming a small diameter sleeve (3b) at one end of a large diameter sleeve (3a) for connecting the metal product (2).
b) is fitted and fixed to the receiving port (12) on the opposite side of the receiving port (5) of the EF joint (1), and the metal product (2) is connected to the large diameter sleeve (3a) of the joint fitting (3). It is configured to do.

A ring groove (13) is formed on the outer peripheral surface of the small diameter sleeve (3b) of the joint fitting (3), and a projection (14) fitted into the ring groove (13) is provided with an EF joint (1). Is provided on the peripheral surface of the receiving port (12) of the joint metal fitting (3) so that the joint fitting (3) is positioned (removed) in the axial direction.

Further, a discontinuous ring groove (16) is formed on the end face of the small diameter sleeve (3b) of the joint fitting (3), and a projection (1) fitted into the discontinuous ring groove (16).
7) is provided on the insertion amount restricting surface (18) at the bottom of the receiving port (12) to restrict the rotation of the joint fitting (3).

Further, a caulking ring (20), which is a metal ring for retaining the joint fitting, is fitted and fixed to the outer periphery of the receiving port (12) of the EF joint (1), and the caulking ring (20) is approximately 90 °. By caulking uniformly from the outer circumference toward the inside at intervals, the small-diameter sleeve (3) that is one end of the joint fitting (3) is fitted to the receiving port (12) of the EF joint (1).
b) Caulk and fix, EF joint and joint fitting (3)
The joint surface having the unevenness is closely adhered and airtight, and is maintained so as to prevent leakage from the joint surface and separation of the joint metal fitting (3).

Incidentally, the outer diameter of the end portion of the socket (12) of the EF joint (1) into which the caulking ring (20) is fitted is reduced by the thickness of the caulking ring (20), and the caulking ring (2) is
0) prevents the outer peripheral surface of the EF joint (1) from being stepped.

The caulking ring (20) is slightly inwardly embedded from the end of the receiving port (12) of the EF joint (1) on the outer surface of the EF joint (1) so that the caulking ring (20) is fitted and fixed to the caulking ring (20). be able to.

The caulking ring (20) is made of EF.
It is attached at the time of molding the joint (1), and the conductive wire (6) of the EF joint (1) (the conductive wire folded in two is coiled around a cylindrical surface and held in a sleeve shape) and the joint metal fitting (3). ) Together with the caulking ring (20) in the mold (insert), the caulking ring (20) is mounted together with the conductive wire (6) and the joint fitting (3), and
With the injection product or the injection screw, the molding material (thermoplastic resin) that has been melted by heat and fluidized in the injection cylinder is press-fitted into the mold which is tightly closed, thereby forming a resin product (4). A conductive wire (6) is embedded in the contact surface, and a small-diameter sleeve (3) of the joint fitting (3) is provided in the receiving port (12) opposite to the receiving port (5) of the resin product (4).
EF joint (1) in which the b) is integrally fitted and attached, and the caulking ring (20) is integrally fitted and attached to the outer periphery of the receiving port (12) in which the small diameter sleeve (3b) is integrally fitted and attached. Is molded.

After the molding, the caulking ring (20) is replaced by approximately 9
The joint fitting (3), which is a metal product, is prevented from coming off from the EF joint (1), which is a resin molded product, by caulking from the outer circumference inwardly at 0 ° intervals.

The type of the EF joint (1) and the type of the joint fitting (3) are appropriately selected depending on the types, the number, the directions, the places of use of the resin product (4) and the metal product (2) to be connected. Is.

[0022]

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

By mounting the caulking ring together with the joint metal fitting at the time of molding the EF joint, the caulking of the joint metal fitting having an outer diameter larger than the inner diameter of the caulking ring can be carried out, and it can be applied to prevent any joint metal fitting from coming off. Further, since there is no gap between the EF joint and the caulking ring, it is possible to obtain a predetermined adhesion force with a minimum amount of deformation, and it is possible to suppress the strength reduction of the caulking ring to a minimum. In addition, the endless caulking ring enables caulking with uniform force. By these, higher retaining strength can be obtained, and the strength can be reliably maintained for a long period of time.

Further , the caulking ring is simply a metal ring .
By doing so, the structure is simple, the cost is low, and it is possible to prevent the appearance from being impaired.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of the entire joint.

[Explanation of symbols]

 (1) EF joint (3) Joint metal fitting (20) Caulking ring

Claims (1)

(57) [Claims] 1. A conductive wire of an electrofusion joint and a joint metal fitting are pressed together with a fluidized molding material into a mold equipped with a caulking ring, the conductive wire is embedded in a contact surface with a resin product, and a joint is formed. A method for retaining an electrofusion joint joint metal fitting in which an electrofusion joint in which a caulking ring is integrally attached together with a metal fitting is molded and the caulking ring is caulked after the molding.