JPH0287495A - High frequency induction heating coil - Google Patents

Abstract

PURPOSE:To obtain a heating coil easy to manufacture and of high workability and adaptable to all objects by constructing the heating coil with a freely wound flexible coil. CONSTITUTION:A heating coil to heat an object 7 wound on the object 7 and turned on through electric cables 8 connected to the terminal plates 6 provided on the both ends of the coil is constructed with a freely wound flexible coil 9. Thereby the only one flexible coil 9 can be adapted to all objects with no need to make heating coils same shape and same size to respective objects 7. Thus a heating coil easy to manufacture and of high workability and adaptable to all objects can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high frequency induction heating coil (hereinafter referred to as a heating coil).

[Conventional technology]

Conventionally, as described in Japanese Unexamined Patent Publication No. 58-9786, heating coils were formed from square hollow steel or copper pipes to match the shape of the object to be heated (hereinafter referred to as the object). was producing.

That is, as shown in FIG. 6, in the conventional heating coil, the turns 1 are machined to match the object, and each turn 1 is conventionally made of square hollow steel or copper pipe 2. . When attaching to the object, the coil is divided into two parts at the center, so attach it in half. After installation, tighten the joint 3 with bolts or shank. After that, in order to fix it to the object, the insulating material 4 is used to adjust the clearance with the object. In addition, in the same figure, 5 is a stepped part and 6 is a terminal board.

Because it was manufactured in this way, it was necessary to manufacture one heating coil for each object, and manufacturing required a mold with exactly the same shape and dimensions as the object. Therefore, no consideration was given to application to irregularly shaped objects.

[Problem to be solved by the invention]

For the heating coil, a rectangular hollow copper or copper pipe with good conductivity is used, a mold is made that has exactly the same shape and dimensions as the object, and the copper pipe or rectangular hollow copper is attached to the mold. Build each turn one by one. The completed turns are arranged on the mold in the regular dimensions and fixed using insulating material. This is divided into two halves to form one heating coil. This work is performed for the number of objects to be processed, and the same number of coils as the objects are manufactured. Therefore, the same number of molds as the coils are manufactured, resulting in an enormous cost. In addition, since the coil has a fixed number of turns, the matching of the coil has conventionally been achieved by changing the taps of the transformer or inserting a capacitor.
There is a limit to its range, and coils that cannot be matched are redesigned.

There are also cases of remanufacturing, and the conventional technology does not take into account consistency and compatibility with multiple objects, resulting in huge costs and poor workability.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a high-frequency induction heating coil that is easy to manufacture, has good workability, and can be applied to all kinds of objects.

[Means to solve the problem]

The above object is achieved by forming the heating coil with a flexible coil that can be freely wound.

[Effect]

The heating coil is made of a flexible coil that can be wound freely, allowing one flexible coil to be used for all objects.

There is no need to manufacture a heating coil having the same shape and size as the object as in the past, and it is possible to obtain a heating coil that is easy to manufacture, has good workability, and can be applied to all objects.

〔Example〕

The present invention will be explained below based on the illustrated embodiments. An embodiment of the present invention is shown in FIGS. 1-4.

Note that parts that are the same as those in the conventional system are given the same reference numerals, and therefore their explanations will be omitted. An electric cable 8 is connected to the terminal plate 6 that is wound around the object 7 and provided at both ends of the object 7 and energized.
In this example, the heating coil for heating the is formed of a flexible coil 9 that can be freely wound. By doing this, one flexible coil 9 can be used for all objects, and there is no need to manufacture a heating coil with the same shape and dimensions as the object 7, which is required in the past. It is possible to obtain a heating coil that is easy to use, has good workability, and can be applied to all objects 7.

That is, as shown in FIG. 1, the heating coil is formed of a flexible coil 9, and terminal plates 6 are provided at both ends of the flexible coil 9, and a coolant inlet 10 and a coolant A discharge port 11 is provided.

FIG. 2 shows the structure of the flexible coil 9. As shown in the figure, a coil core 13 is inserted into the center of the braided copper wire 12, which is a turn of a conventional coil, to maintain the shape of the braided copper wire 12.

A covering insulation material 14 is provided around the outer periphery of the braided copper wire 12, and the hollow space between them is used as a refrigerant passage to prevent heating due to piping radiation heat and self-heating of the braided copper wire 12, and a clearance insulation material is provided to secure the passage. The plates 15 were attached at regular pitches over the entire length of the coil. Clearance insulation plate 15
A hole 15at& is provided to allow the refrigerant to pass through, and a perforated structure is provided to ensure a passage for the refrigerant. In addition, insulating plate 1 for clearance
5 makes contact with the object through the covering insulating material 14 to maintain a constant clearance between the object and the braided copper 812. A glass adhesive tape is wound around the outer periphery of the insulation covering material 14 for the purpose of protecting the flexible coil 9 from radiant heat from the object.

FIG. 3 shows the flexible coil attached to an object. A soft flexible coil 9 is wound around the object 7 a predetermined number of times along the surface of the object 70, an electric cable 8 is connected and fixed to the terminal plates 6 at both ends of the flexible coil 9, and heated by electricity. Since the flexible coil 9 is fixed to the object 7 by squeezing and pulling the electric cable 8, there is no need to fix the flexible coil 9 to the object 7 using bolts and nuts that are divided into two parts or shakomans, which have been conventionally used.

Furthermore, since the flexible coil 9 is composed of a soft braided copper wire and a coated insulating material, even if the object 7 is austenitic stainless steel piping, such as a nozzle holder, reducer, or seat, it can be easily moved along the surface of the piping. It can be wrapped around.

FIG. 4 shows a cross section of the flexible coil attached to the object. By winding the flexible coil 9 directly onto the outer surface 16 of the object, the clearance insulating plate 15 comes into direct contact with the outer surface 16 of the object.

Furthermore, the clearance insulating plates 15 also come into direct contact between adjacent flexible coils. Therefore, a gap 17 and a clearance 18 are forcibly determined for the braided copper wire 12 which becomes the turns of the conventional coil. Therefore, the work that requires precision adjustment of the clearance between the heating coil and the object, which has conventionally been carried out under high radiation doses and in narrow spaces, is no longer necessary.

FIG. 5 shows the heating temperature distribution when the flexible coil of this example is used. Measurement point B is 530℃
, measurement point C is 500°C.

The pipe surface temperature is 500 to 530°C, which is comparable to conventional coils. In addition, in the same figure, 19 is cooling water for piping.

In this way, according to this example, it is possible to handle a large number of objects with different shapes with a single heating coil, which not only results in a significant cost reduction, but also allows for work under high radiation doses. This can reduce radiation exposure and reduce man-hours.

In other words, the heating coil is constructed by insulating the outer periphery of a soft braided copper wire with a covering insulation material, and having a refrigerant passage for cooling the coil between the braided copper wire and the covering insulation material. By winding the coil directly around the coil, it can now function as a heating coil. For this reason, it is now possible to use the heating coil of this embodiment to handle multiple objects with irregular shapes and dimensions, which has been considered difficult in the past. Since the mold only requires the production cost of one coil, the production cost of the heating coil and the molding die can be significantly reduced.

In addition, since the insulating material is wrapped directly around the object when installing the coil, it is possible to eliminate the precision work required to adjust the clearance of the heating coil, which has been done in high-dose and narrow spaces, which is effective in reducing radiation exposure and man-hours. . Regarding the electrical consistency of the heating coil, if the coils could not be matched, the conventional coil would be redesigned and remanufactured. By changing the length, the number of turns can be changed and consistency can be improved.

〔Effect of the invention〕

As mentioned above, the present invention provides a heating coil that is easy to manufacture, has good workability, and can be applied to all types of objects. A coil for induction heating can be obtained.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a coil outline of one embodiment of the high-frequency induction heating coil of the present invention, Fig. 2 is a view taken along arrow A-A in Fig. 1, and Fig. 3 is an object of the same embodiment. FIG. 4 is a perspective view showing a state of winding around an object, and FIG. 4 is a longitudinal side view showing a state of winding around an object according to the embodiment. FIG. 5 is a temperature distribution diagram of an object according to another embodiment, and FIG. 6 is a perspective view of a conventional high-frequency induction heating coil. 6... Terminal board, 7... Heated object, 8... Electric cable, 9... Flexible coil, 12... Braided copper wire, 14... Covered insulation material, 15... Insulating board for clearance. 15a...hole. No. 6-Magazine sheet q---Fresh pull coil shadow 15---7 Amber f hat for reallands 1 momme-ha 11th fixed-point 3 cold 4th memu mouth

Claims (1)

[Scope of Claims] 1. In a high-frequency induction heating coil that is wound around a heating object and is energized by connecting an electric cable to terminal plates provided at both ends of the coil to heat the heating object, the heating A high-frequency induction heating coil characterized in that the coil is formed of a flexible coil that can be wound freely. 2. The flexible coil is composed of a braided copper wire and a covering insulation material provided on the outside of the braided copper wire via an insulating plate for clearance, and between the braided conductive wire and the covering insulation material. The high-frequency induction heating coil according to claim 1, wherein the coil is provided with a passage through which a refrigerant passes. 3. The high-frequency induction heating coil according to claim 2, wherein the clearance insulating plate is formed with holes through which the refrigerant passes. 4. The high-frequency induction heating coil according to claim 1, wherein the object to be heated is a pipe made of austenitic stainless steel.