JP2721517B2 - High frequency induction heating coil - Google Patents

Description

The present invention relates to a high-frequency induction heating coil (hereinafter, referred to as a heating coil).

[Conventional technology]

Conventionally, as described in JP-A-58-9786, a heating coil is formed of a square hollow copper or copper pipe and has a shape to be heated (hereinafter, referred to as an object). Was being produced.

That is, as shown in FIG. 6, the conventional heating coil processes a turn 1 according to an object, and each turn 1 is conventionally formed of a square hollow copper or copper pipe 2. . Since the mounting to the object is divided into two at the center of the coil, the mounting is performed in a half-split state. After installation, joint 3
With bolts or screws. After that, the clearance with the object is adjusted and stopped by the insulating material 4 in order to fix the object to the object. In the figure, 5 is a paragraph, 6
Is a terminal plate.

Since the heating coil was manufactured in this way, it was necessary to manufacture the heating coil one by one for the object, and the manufacturing required the production of a mold having exactly the same shape and dimensions as the object. Therefore, no consideration was given to the application to deformed objects.

[Problems to be solved by the invention]

For the heating coil, use a square hollow copper or copper pipe with good conductivity, make a mold with exactly the same shape and dimensions as the object, paste the copper pipe or square hollow copper on the mold,
Make the turn one by one. The resulting turns are arranged in the correct size on the mold and secured using insulation. This becomes one heating coil in two halves. The operation is performed by the number of objects, and the same number of coils as the objects are manufactured. Accordingly, since the number of the forming dies is also equal to the number of the coils, the cost is enormous. In addition, since the coil has a fixed number of turns, it is conventionally handled by changing the tap of the transformer or inserting a capacitor, but the range is limited. In some cases, the prior art does not consider compatibility and handling of a plurality of objects, and has a problem of enormous cost and poor workability.

The present invention has been made in view of the above, and it is an object of the present invention to easily manufacture and have good workability, that is, it is easy to adjust a clearance between a heating coil and an object and a clearance between adjacent heating coils. Another object of the present invention is to provide a high-frequency induction heating coil of this kind which is applicable to all objects.

[Means for solving the problem]

That is, the present invention is a high-frequency induction heating coil wound around an object to be heated and energized by connecting an electric cable to a terminal plate provided at both ends thereof and heating the object to be heated. The heating coil is composed of a braided copper wire and a coating insulating material provided on the outside of the braided copper wire via a clearance insulating plate, and the coil is flexibly formed, and the braided copper wire is formed. A passage for passing a cooling medium is provided between the wire and the covering insulating material to achieve an intended purpose.

In this case, the clearance insulating plate is provided with a hole through which the refrigerant passes.

[Action]

The heating coil is formed of a flexible coil that can be wound freely, so that a single flexible coil can be used for all objects, and the heating coil has the same shape and dimensions as the object as before Therefore, it is possible to obtain a heating coil which is easy to manufacture, has good workability, and can handle all objects.

Further, in this case, since the covering insulating material is provided via the clearance insulating plate, the gap and clearance of the braided copper wire are forcibly determined by the clearance insulating plate, and therefore, between the adjacent coils and between the adjacent coils and the coil. Work that requires precision of clearance adjustment with the object is not required.

〔Example〕

Hereinafter, the present invention will be described based on the illustrated embodiments.
1 to 4 show one embodiment of the present invention. The same parts as those in the related art are denoted by the same reference numerals, and the description thereof will be omitted. In this embodiment, a heating coil wound around the object 7 and heated by connecting the electric cable 8 to terminal plates 6 provided at both ends thereof and heating the object 7 is a flexible coil 9 which can be freely wound in this embodiment. Formed. By doing so, one flexible coil 9 can be used for all objects, and there is no need to manufacture a heating coil having the same shape and the same size as the object 7 as in the related art. Thus, it is possible to obtain a heating coil which has good workability and can cope with all the objects 7.

That is, as shown in FIG. 1, the heating coil was formed by the flexible coil 9, and the terminal plate 6 was provided at both ends of the flexible coil 9. An outlet 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 serving as a turn of the conventional coil, the shape of the braided copper wire 12 is maintained, and the outer periphery of the braided copper wire 12 is formed. Is provided with a covering insulating material 14, and a hollow portion therebetween is used as a refrigerant passage to prevent heating of the braided copper wire 12 due to radiant heat and self-heating, and a clearance insulating plate 15 is provided over the entire length of the coil to secure the passage. Mounted with constant pitch. The clearance insulating plate 15 is provided with a hole 15a through which the refrigerant passes, and has a perforated structure to secure a passage for the refrigerant. In addition, the clearance insulating plate 15 makes contact with the target through the covering insulating material 14, thereby making the clearance between the target and the braided copper wire 12 constant. A glass adhesive tape is wound around the outer periphery of the covering insulating material 14 in order to protect the flexible coil 9 from radiant heat from the object.

FIG. 3 shows a state where the flexible coil is attached to the object. A flexible coil 9 having flexibility is wound around the object 7 a predetermined number of times along the surface of the object 7, and an electric cable 8 is connected and fixed to terminal plates 6 at both ends of the flexible coil 9, and is heated by conduction. Since the flexible coil 9 is fixed to the object 7 by drawing with the electric cable 8, it is not necessary to fix the flexible coil 9 with the conventionally used two-piece bolt nut or screw. Further, since the flexible coil 9 is made of a flexible braided copper wire and a covering insulating material, the object 7 is formed along the surface of the austenitic stainless steel pipe, such as a nozzle, a reducer, and a seat, regardless of whether it is a pipe. Can be wound around.

FIG. 4 shows a cross section in a state where the flexible coil is attached to the object. By winding the flexible coil 9 directly on the outer surface 16 of the object, the insulating plate 15 for clearance directly contacts the outer surface 16 of the object. Also, the clearance insulating plate 15 is in direct contact between adjacent flexible coils. Therefore, the gap 17 and the clearance 18 are forcibly determined for the braided copper wire 12 which is the turn of the conventional coil. Accordingly, it is no longer necessary to perform an operation that requires precision of clearance adjustment between a heating coil and an object, which has been conventionally performed under a high dose and in a narrow portion.

FIG. 5 shows a heating temperature distribution when the flexible coil of this embodiment is used. Measurement point B is 530
° C, the measurement point C is 500 ° C, and the pipe surface temperature is 500-53.
0 ° C, which is comparable to conventional coils. In the figure, reference numeral 19 denotes cooling water for piping.

As described above, according to the present embodiment, it is possible to cope with many objects having different shapes with one heating coil, so that not only the cost is significantly reduced, but also the operation under a high dose is performed. Can be reduced, and the effects of reducing exposure and man-hours can be achieved.

In other words, the heating coil is configured by covering and insulating the outer periphery of the soft braided copper wire with the covering insulating material, and having a refrigerant passage for cooling the coil between the braided copper wire and the covering insulating material. The function of the heating coil can be achieved by directly winding the coil around the coil. For this reason, a plurality of objects having different shapes and different dimensions, which has been difficult in the past, can be handled by one heating coil of the present embodiment. Since only one coil is required for manufacturing the coil, the manufacturing cost of the heating coil and the forming die can be significantly reduced. In addition, since the covering insulating material is wound directly around the object when mounting the coil, the precise work of adjusting the clearance of the heating coil, which has been performed in a high dose and in a narrow part, can be eliminated, which is effective in reducing the exposure and man-hours. . If the coil does not match with the electrical coil of the heating coil, the conventional coil was redesigned and remanufactured. An insulation material was inserted between the object and the flexible coil. By changing the length, the number of turns can be changed, and the consistency can be improved.

〔The invention's effect〕

As described above, according to the present invention, the manufacturing is easy and the workability is good, that is, the clearance adjustment between the heating coil and the object and the clearance adjustment between the adjacent heating coils are easy, and all the objects can be controlled. It is possible to obtain a high-frequency induction heating coil of this type which can be used for an object.

[Brief description of the drawings]

FIG. 1 is an explanatory view schematically showing a coil of an embodiment of a high-frequency induction heating coil according to the present invention, FIG. 2 is a view taken in the direction of arrows AA in FIG. 1, and FIG. FIG. 4 is a perspective view showing a state of being wound on an object, FIG. 4 is a longitudinal sectional side view showing a state of being wound on an object of one embodiment, and FIG. FIG. 6 is a perspective view of a conventional high-frequency induction heating coil. 6 ... terminal board, 7 ... object to be heated, 8 ... electric cable, 9 ... flexible coil, 12 ... braided copper wire, 14
…… Coating insulation material, 15… Insulation plate for clearance, 15a…
…hole.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Naotake Sugawara 3-1-1, Sachimachi, Hitachi-shi, Ibaraki Pref. Hitachi, Ltd. Hitachi Plant (56) References JP-A-61-49395 (JP, A) Kaikai 57-212794 (JP, A)

Claims (2)

(57) [Claims] 1. A high-frequency induction heating coil wound around an object to be heated and energized by connecting an electric cable to terminal plates provided at both ends thereof to heat the object to be heated. The heating coil is composed of a braided copper wire and a covering insulating material provided outside the braided copper wire via a clearance insulating plate, and the braided copper wire and the covering insulating material are provided. A high-frequency induction heating coil, wherein a passage for passing a refrigerant is provided between the coil and the coil. 2. The high-frequency induction heating coil according to claim 1, wherein said clearance insulating plate has a hole through which said refrigerant passes.