JPH10227385A - High frequency induction heating joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with a jig with built-in induction coil to be positioned on the outer part of a joint by providing a IH resin heater on the surface of the molding of thermoplastic synthetic resin material, and providing an induction coil on the position surrounding the heater in the vicinity of it. SOLUTION: This joint 10 is provided with a IH resin heater 2 on the inner circumferential face of a hollow joint body 1 made of thermoplastic synthetic resin, in addition to this, it is further provided with an induction coil 3 so as to surround the heater, the heater 2 and the coil 3 are integratedly molded at molding the joint body 1, and the insulated condition is held with the resin material. In the joint body 1, a high frequency magnetic field generating device A is connected to the coil 3, and the heater 2 is heated so as to be joined together by welding. The coil 3 is formed out of copper or aluminum continuous wire into a helical shape, and the heater 2 is formed into a cylindrical body so that granule of a high frequency induction heat generating material kneadingly indwells in a thermoplastic or adhesive thermoplastic synthetic resin material. By such constitution, a jig with the built-in induction coil becomes unnecessary, melting of the connection part becomes uniform, and pipes can be favorably joined together.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoplastic synthetic resin joint having an IH heater and an induction coil for causing the IH heater to generate heat. More specifically, the present invention relates to a synthetic resin pipe and a synthetic resin pipe or a different synthetic resin pipe. The present invention relates to a thermoplastic synthetic resin joint used for connection with a pipe and connection of a branch pipe.

[0002]

2. Description of the Related Art From the viewpoint of corrosion resistance, pipes made of polyethylene, polypropylene, or polybutene are used as pipe materials for gas, water, and the like. As the joint between the joint and the tube is optimally welded by thermal fusion between the two, an FE joint is used as a joint therefor.

A conventional EF joint (electrically welded joint) is shown in FIG.
As shown in the figure, the two hoses are used when connecting two gas pipes, for example, polyethylene hoses H, H. The two hoses are located in abutting manner in the EF joint 1 'and embedded in the EF joint. The heating coil 2 '(Nichrome wire) is energized to thermally fuse the resin tube H' in this portion with the polyethylene material P ', which is a material for forming the EF joint, and after cooling after the energization is stopped, the portion is sealed. It joins in a shape.

The present applicant has disclosed a technique of a pipe joint having a high-frequency induction heating element in Japanese Patent Application Laid-Open No. 7-139681, and the disclosed technique is briefly described below with reference to FIG. is there.

FIG. 1 shows a joint 1 ′ of a pipe joint 10 ′ and a joining pipe 2
This shows the case where 0 'and 20' are connected.
Synthetic resin tubes 20 ', 20' made of the same material as
In a state where each of the ends is inserted to the joint portion with the joint, the high-frequency magnetic field generator A having the high-frequency power source H and the magnetic field generating electrode (induction coil) E is operated to induction-heat the heating layer 2 ′ of the joint. This heat melts the connection portion, and a solidified connection is obtained by welding the joint 1 'and the connection pipes 20', 20 '.

[0006]

In the case of the conventional EF joint, the nichrome wire (heating coil) may be broken at the time of forming the joint or cooling after welding, or the lead wire may be broken by the heat generated by the connection outlet itself. There were drawbacks. Further, in the case of a pipe joint having a high-frequency induction heating element that eliminates the disadvantages of the EF joint, the magnetic field generating electrode (induction coil) needs to be located outside the joint, and the positional relationship with the heating layer must be adjusted. Work problems.

[0007]

SUMMARY OF THE INVENTION The present invention has been developed by the present applicant and has been disclosed in Japanese Patent Application Laid-Open No.
By using an IH resin heater technically disclosed as 219146, and by installing an induction coil for heating the IH resin heater at a position close to the heater, a pipe joint having the high-frequency induction heating element described above can be used. An object of the present invention is to provide a joint that does not require a jig (induction coil) incorporating an induction coil for generating a high-frequency magnetic field to be positioned outside a required joint.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A joint incorporating an induction coil according to the present invention will be described with reference to FIG.
In FIG. 1, reference numeral 10 denotes the above-described joint. This joint 10 is provided with an IH resin heater 2 on the inner peripheral surface of a hollow joint body 1 made of a thermoplastic synthetic resin, and an induction coil 3 is provided so as to surround the IH heater. The configuration is provided. The IH resin heater 2 and the induction coil 3 are integrally formed when the joint body 1 is formed, and the member is completely insulated by the resin material.

The joint 10 is connected to the positive and negative plugs of the induction coil 3 by connecting the corresponding plugs of the high-frequency magnetic field generator A to heat the IH resin heater via the coil and weld the joint to a joint pipe (not shown). It exhibits a joining function. High frequency induction coil 3 described above
As shown in FIG. 2, a continuous wire 31 made of a conductive material such as copper or aluminum is formed in a spiral shape. FIGS. 3A and 3B show examples of the cross-sectional shape of the continuous line 31. FIG. 3A shows a columnar cross-section, FIG.
Indicates a prismatic cross section.

Further, as shown in FIG. 4 showing the contents disclosed in Japanese Patent Application Laid-Open No. Hei 7-24917 and Japanese Patent Application No. Hei 8-219146 disclosed by the present applicant, the IH resin heater has a high frequency induction heating material 12 as shown in FIG. Is formed as a cylindrical body such that iron powder is kneaded in a thermoplastic or adhesive thermoplastic synthetic resin material or a hot-melt adhesive material 11.

[0011]

An embodiment of the present invention is described below with reference to FIG. When two synthetic resin pipes P and H are joined in a butt shape, a rectangular column-shaped continuous wire provided with an IH resin heater 2 on the inner surface of a thermoplastic hollow body 1 and surrounding the heater is spirally formed. The two resin pipes are inserted into a hollow portion of a joint 10 formed by an induction coil formed as a coil, and a high frequency from a high-frequency magnetic field generator A is applied to the induction coil 3 via a connector. IH resin heater 2 heated by magnetic force from coil 3
The joint between the thermoplastic hollow body and the two synthetic resin tubes in the vicinity of the heater is melted and homogenized at a predetermined temperature, and then homogenized at this portion, and then cooled and solidified to form a joint with the two synthetic resin tubes P and H. 10 is combined. The above-mentioned predetermined temperature is controlled by feeding back a temperature detected by a thermometer T having a detection source located near the IH resin heater 2 to a high-frequency magnetic field generator A.

[Other Embodiments] In each of the embodiments shown in FIGS. 6 and 7, a joint in which an induction coil according to the present invention and a built-in IH resin heater are integrally formed at a pipe joint is provided. The embodiment shown in FIG. 6 shows a case in which a pipe P having a joint is joined to a pipe H in a plane. The IH resin heater 2 is formed in a donut shape, and an induction coil 3 is formed. Is formed as an induction heating coil in which a continuous wire is spirally wound. In the embodiment shown in FIG. 7, a branch pipe P is joined to the side of a pipe H.
Is formed in the same shape as the shape of the junction of the branch pipe,
The induction coil 3 is formed as an induction heating coil that spirally winds a continuous wire and is entirely formed as a bag.

The joint according to the present invention is not limited to the above embodiments, but can be applied to the following items. (1) By forming a synthetic resin material from a kneading material of an IH resin heater with, for example, a composition (molding adhesive) in which polyethylene, polypropylene, or polyolefin is modified with unsaturated carboxylic acid or anhydride thereof, a pipe of a different material is formed. It can be connected to a pipe. (2) When connecting two pipes having different diameters to each other, the induction coils of two joints having diameters corresponding to the diameters of the respective pipes are independently operated to operate the pipes of different diameters. A connection can be made. (3) Other As the shape and structure of the IH resin heater, a wire, a lattice network, a braided or perforated one, a sintered body, a plate, or the like can be adopted. (4) The induction coil only needs to form a continuous wire of a conductive material in a coil shape, and the shape is not particularly limited.

[0014]

According to the present invention, a high-frequency induction heating element is provided in the vicinity of an IH resin heater and in a position surrounding the heater in an insulating manner in a thermoplastic synthetic resin material. Since the positional relationship with the heater is fixed, the radiation amount of the electromagnetic wave to the above-mentioned IH resin heater becomes uniform, and the fusion of the joint portion of the synthetic resin tube which melts through the heat generation amount of the IH resin heater becomes uniform, so that the pipe joining is good. Can be done.

Further, the present invention can simplify the apparatus by integrally forming a high-frequency heating element, which is an essential component of the conventional high-frequency induction heating apparatus, in a thermoplastic synthetic resin material forming a joint. Further, the present invention generates hysteresis loss due to a high-frequency induction heating element or Joule heat due to an eddy current at a frequency in a relatively low region of a high frequency, thereby achieving weight reduction of the device. In addition, the present invention can control the melting temperature of the IH resin heater to an appropriate temperature by detecting the temperature of the IH resin heater via a thermometer.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a high-frequency induction heating joint according to the present invention.

FIG. 2 is an explanatory diagram of an induction coil.

FIG. 3 is an explanatory diagram of a continuous line forming an induction coil.

FIG. 4 is an explanatory diagram of a high-frequency induction heating material.

FIG. 5 is an explanatory diagram of an embodiment of the present invention.

FIG. 6 is an explanatory diagram of another embodiment.

FIG. 7 is an explanatory diagram of another embodiment.

FIG. 8 is an explanatory diagram of an EF joint.

FIG. 9 is an explanatory diagram of a high-frequency induction heating joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joint body 11 Resin material 12 Heating material 2 IH resin heater 3 Induction coil 31 Continuous wire A High frequency magnetic field generator H Resin tube P Resin tube T Thermometer

Claims (4)

[Claims] 1. The surface of a molded article of a thermoplastic synthetic resin material
A high frequency induction heating joint comprising an H resin heater, and an induction coil provided near the IH resin heater and at a position surrounding the heater. 2. A high-frequency induction heating joint, wherein the molded article of the thermoplastic synthetic resin material according to claim 1 is formed as a hollow body. 3. A high frequency induction heating joint, wherein the IH resin heater according to claim 1 is formed by kneading a high frequency induction heating material and a molding adhesive or a hot melt type adhesive. 4. The high frequency induction heating joint according to claim 1, wherein the temperature of the IH resin heater is detected, and the detected amount is fed back to the high frequency induction heating device to control the heating temperature of the IH resin heater. High frequency induction heating joint characterized by the following.