JP2012094440A - Electric wire for heating coil used for induction heating apparatus and heating coil used for induction heating apparatus using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric wire for a heating coil used for an induction heating apparatus and a heating coil using the same, which is placed especially in a painting system adopting a drying step by induction heating, capable of easily changing a shape, and is never burnt even when a large current is made to flow.SOLUTION: An electric wire 1 for a heating coil used for an induction heating apparatus comprises: an outer shell part 2 constituted of a flexible silicone hose; one or a plurality of electric wire bodies 3 loaded inside of the outer shell part 2; and a coolant 4 filled up inside of the outer shell part 2. A heating coil 5 is constituted by processing the electric wire 1 into a desired shape, thus the heating coil used for the induction heating apparatus can be easily deformed into a desired shape by following a shape of a work W and is never burnt even when a large current of high frequency is made to flow for induction heating in a painting system.

Description

  The present invention relates to an electric wire for a heating coil used for an induction heating device and a heating coil used for an induction heating device using the same, and more specifically, it can withstand a large current and can be easily deformed in shape. The present invention relates to an electric wire for a heating coil used for an induction heating device and a heating coil used for an induction heating device using the same.

  As is well known, when painting an object to be coated (hereinafter referred to as “work”) in a painting system, it is necessary to apply the paint to the work with a spray gun or the like and then dry the applied paint to fix it on the work. . Conventionally, this drying is performed by blowing hot air onto the workpiece after putting the workpiece coated with the paint into the drying oven using a drying oven.

  However, in general, it takes about 40 minutes to make the inside of the drying furnace about 160 degrees, so that the drying time takes a long time in hot air drying, which increases the overall coating time. The problem that it ends up can be pointed out.

  Further, in the drying in the drying furnace, toxic gas is generated, so that the toxic gas needs to be exhausted, and the drying furnace is ventilated, which causes heat loss. The time until the inside of the drying furnace reaches a predetermined temperature is prolonged.

  Therefore, a drying method using high-frequency induction heating has been proposed as a method for solving the problem of drying with hot air.

  In the coating system, when drying the paint applied to the work using induction heating, the work is put in the heating coil using a cylindrical heating coil, and the heating coil is in a high frequency state in that state. In order to dry the paint applied to the workpiece in the coating system at this time, it is necessary to pass a large current, so in general, a heating coil is constituted by a copper pipe. The cooling water is made to flow through the copper pipe.

JP 2009-36389 A JP 2007-275720 A JP 2007-203166 A JP 2007-10737 A JP 2000-239896 A

  By the way, in induction heating, it is desirable to use a heating coil having a shape along the shape of the workpiece in order to improve the heating efficiency by bringing the workpiece as close to the heating coil as possible.

  However, in the coating system, since the shape of the workpiece to be coated varies, it is difficult to efficiently heat various workpieces with a single heating coil.

  In this regard, if the shape of the heating coil can be changed according to the shape of the workpiece, it is possible to efficiently heat various workpieces regardless of the shape of the workpiece. Since it is necessary to flow a large current when heating, the conventional heating coil used for induction heating in the coating system uses a copper pipe to be able to withstand the large current and is a heating target. The shape cannot be easily changed according to the shape of the workpiece, so it is necessary to prepare a heating coil for each workpiece with different shapes, which increases costs. It was.

  On the other hand, by using a thin wire to form a coil, it is possible to obtain a heating coil whose shape can be easily changed. However, in the case of a thin wire, there is a risk of burning at high temperatures when a large current is passed. There is.

  Accordingly, the present invention provides a heating coil electric wire for use in an induction heating apparatus that can easily change its shape and does not burn even when a large current is passed, particularly in a coating system that employs a drying process by induction heating. An object of the present invention is to provide a heating coil used in an induction heating apparatus using the same.

The electric wire for the heating coil used in the induction heating device of the present invention is
An electric wire for a heating coil used for an induction heating device in a painting system,
An outer shell made of a flexible hose;
An electric wire body loaded in the outer shell,
And a coolant filled in the outer shell portion.

  The electric wire for the heating coil used in the induction heating device of the present invention has the electric wire body loaded inside the outer shell portion constituted by a flexible hose, and the outer shell portion loaded with the electric wire main body is filled with cooling water. Configured.

  Therefore, the shape can be easily changed according to the shape of the workpiece to be heated, and the periphery of the wire body is filled with cooling water. It is possible to obtain a heating coil that does not burn even when flowing.

It is a figure for demonstrating the structure of the Example of the electric wire for heating coils of this invention. It is a figure for demonstrating the structure of the Example of the electric wire for heating coils of this invention. It is a figure for demonstrating the heating coil using the Example of the electric wire for heating coils of this invention. It is a figure for demonstrating the heating coil using the Example of the electric wire for heating coils of this invention.

  The electric wire for the heating coil used in the induction heating apparatus of the present invention has a hose-like outer shell portion, and this outer shell portion is constituted by a flexible hose made of silicon.

  And in this outer shell part, one or several electric wire main bodies are loaded, and it is supposed that an electric current will be sent through this electric wire main body.

  In addition, in the outer shell portion, the periphery of the electric wire body is filled with cooling water for preventing the electric wire main body from becoming high temperature. It is possible to prevent the main body from becoming hot and burning.

  Here, it is preferable to use a litz wire as the electric wire main body, thereby allowing a large current to flow efficiently.

  An embodiment of the heating coil electric wire used in the induction heating apparatus of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing a longitudinal structure of the heating coil electric wire according to the present embodiment as viewed in the longitudinal direction. Moreover, FIG. 2 is sectional drawing which shows the longitudinal cross-section which looked at the electric wire for heating coils of a present Example along the longitudinal direction.

  And in the figure, 1 is an electric wire of a present Example, In the present Example, the said electric wire 1 has an outer shell part. That is, in the figure, 2 is an outer shell portion, and in the present embodiment, the outer shell portion 2 is a hollow hose, specifically, a flexible hose made of silicon and having a desired shape. It can be easily deformed.

  Next, 3 is an electric wire main body in the figure. That is, in the electric wire 1 in this embodiment, the electric wire main body 3 is loaded in the outer shell portion 2, and an electric current is passed through the electric wire main body 3.

  Here, the electric wire main body 3 will be described. In the present embodiment, the electric wire main body 3 uses a litz wire, thereby enabling a high-frequency large current to flow efficiently.

  That is, as is well known, when a high-frequency current is passed through a conductor, this current has the property of flowing only on the surface of the conductor. For this reason, even when a thick conductive wire is used as an electric wire, a large current cannot be efficiently passed. Further, even when a large number of thin electric wires are bundled, if only the entire outer periphery is insulated, the configuration is the same as that of one thick conductive wire, and a high-frequency current cannot be efficiently passed.

  On the other hand, when a litz wire in which a number of thin conducting wires that are insulated from each other are bundled is used, when a current is passed through the litz wire, all the conducting wires constituting the litz wire pass a current. Therefore, it is possible to flow a large current efficiently.

  For this purpose, the Litz wire is used as the electric wire main body 3, and the electric wire 1 of this embodiment in which the electric wire main body 3 is loaded in the outer shell 2 can efficiently flow a high-frequency large current. .

  Further, in the present embodiment shown in the figure, since two electric wire main bodies 3 composed of litz wires are loaded in the outer shell portion 2, it is possible to flow a higher current and high frequency. However, it is not always necessary to load two electric wire main bodies 2, and only one or three or more may be used.

  In the present embodiment, a flexible wire having a diameter of about 5 mm is used as the litz wire, thereby making it possible to easily deform the electric wire body 3 into a desired shape.

  Next, in the figure, 4 is cooling water. That is, in the electric wire 1 of the present embodiment, the outer shell portion 2 is filled with the cooling water 4, thereby preventing the electric wire body 3 from burning.

  As described above, in the coating system, when induction heating is used in the process of drying the paint applied to the workpiece, it is necessary to flow a large current through the heating coil. There was a risk of burning.

  However, in the electric wire 1 of the present embodiment, since the cooling water 4 is filled in the outer shell portion 2 in which the electric wire main body 3 is loaded, the electric wire main body 3 is effectively prevented from burning at a high temperature. It is possible.

  In addition, although illustration is abbreviate | omitted, in the present Example, both ends of the said outer shell part 2 are closed by the wall etc. in order to prevent the leakage of the cooling water 4, On the other hand, the said electric wire 3 is outer shell. The electric wire main body 3 can be cooled while passing an electric current through the electric wire main body 3 through the outer wall of the portion 2 and extending to the outside.

  Next, the operation of the electric wire 1 of this embodiment configured as described above will be described. In the electric wire 1 of this embodiment, a thin litz wire having a diameter of about 5 mm is used as the electric wire main body 3, and the electric wire main body 3 is made of silicon. Since it is loaded in the outer shell 2 made of a flexible hose made of metal, the entire electric wire 1 can be processed into a desired shape and easily desired in accordance with the shape of the workpiece to be heated. It is possible to form a heating coil having a shape to be formed.

  Further, since the outer shell 2 is filled with the cooling water 4 so as to surround the wire body 3, the wire body 3 becomes hot even when a large current is passed through the wire body 3. It is also possible to prevent a burning situation, and it is therefore possible to obtain a heating coil that does not burn even when a large current is passed, such as induction heating in a coating system.

  Next, an embodiment of the heating coil using the electric wire of the present embodiment configured as described above will be described. FIG. 3 and FIG. 4 are diagrams for explaining the heating coil for the induction heating apparatus of the present embodiment. It is.

  In the figure, reference numeral 5 denotes the heating coil of this embodiment, and the heating coil 5 of this embodiment is formed by processing the above-described electric wire 1 into a predetermined shape so as to match the shape of the workpiece.

  That is, in the figure, W is a workpiece, and in this embodiment, the workpiece W is a wheel for an automobile.

  And the said heating coil 5 in a present Example is comprised by processing this one electric wire 1 in the cylindrical shape which made the front side and its vicinity the opening using the above-mentioned one electric wire 1. FIG. .

  That is, the heating coil 5 in the present embodiment has a side wall portion 6 formed by deforming the aforementioned electric wire 1 into a cylindrical shape, and a ceiling portion 7 formed by spiraling the electric wire 1, The distal end portion of the electric wire 1 forming the side wall portion 6 and the proximal end portion of the electric wire 2 forming the ceiling portion 7 are made continuous, and the proximal end portion and the ceiling portion 7 of the electric wire 1 forming the side wall portion 6 are formed. The tip of the electric wire 1 forming the wire is extended to the outside of the heating coil 5 to form connection portions 5a and 5b, and a power source is connected to the connection portions.

  Moreover, the part which forms the front side in the said side wall part 6 is deform | transforming upwards, By this, the front side of the side wall part 6 is made into the opening part 8, and the side wall part 6 and ceiling part are passed through this opening part 8. The workpiece W can be inserted into the space surrounded by 7.

  And when heating the workpiece | work in which the coating material was sprayed using the heating coil 5 of this Example comprised in this way, as mentioned above, the side wall part 6 and the ceiling part are provided via the opening part 8. As shown in FIG. 7, the workpiece W is inserted into the space surrounded by 7, and then a current is passed through the heating coil 5 through the connecting portion.

  Then, as is well known, a magnetic field is generated in the heating coil 5, and an eddy current is generated in the workpiece W located in the magnetic field, and Joule heat is generated in the workpiece W by the eddy current and the electrical resistance of the workpiece W. Is generated and the workpiece W can be heated.

  At this time, since the heating coil of the present embodiment is formed using the above-described electric wire 1, it is possible to easily form a heating coil having a desired shape according to the shape of the workpiece W to be heated. Is possible.

  Moreover, since the inside of the electric wire 1 is filled with cooling water so as to surround the periphery of the electric wire main body constituted by the litz wire, the electric wire inside the electric wire 1 even when a large current is passed through the heating coil 5 It is possible to prevent the main body 3 from becoming hot and burning.

  Thus, in the electric wire of the present embodiment and the heating coil for the induction heating apparatus of the present embodiment using this electric wire, it is easy to be deformed into a desired shape according to the shape of the workpiece, and in the coating system. Even when a high-current, high-frequency current is applied for induction heating, an effect of not burning can be obtained.

  The heating coil used in the induction heating device of the present invention and the heating coil used in the induction heating device using the same can be easily deformed and will not burn even when a large current is passed. The present invention can be applied to heating coils used in induction heating apparatuses and the electric wires therefor that are not uniform in shape and require a large current to flow for heating.

DESCRIPTION OF SYMBOLS 1 Electric wire 2 Outer shell part 3 Electric wire main body 4 Cooling water 5 Heating coil 6 Side wall part of heating coil 7 Ceiling part of heating coil 8 Opening part of side wall part of heating coil

Claims (4)

An electric wire for a heating coil used in an induction heating device,
An outer shell (2) made of a flexible hose;
An electric wire body (3) loaded in the outer shell (2);
An electric wire for a heating coil used in an induction heating device, comprising: a coolant (4) filled in the outer shell (2).   The said electric wire main body (3) is a litz wire, The electric wire for heating coils used for the induction heating apparatus of Claim 1 characterized by the above-mentioned.   The electric wire for the heating coil used for the induction heating apparatus according to claim 1 or 2, wherein a plurality of the electric wire main bodies (3) are loaded.   A heating coil used for an induction heating device, wherein the heating coil is used for the induction heating device, wherein the heating coil is formed by the electric wire (1) according to any one of claims 1 to 3.

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