WO2018151422A1 - Superconducting magnet rotating-type direct current induction heating device - Google Patents

Abstract

The present invention relates to a superconducting magnet rotating-type direct current induction heating device. More specifically, the present invention comprises: a pair of superconducting magnets disposed symmetrically to each other with respect to a product to be heated, so as to heat the product by generating a magnetic field while being rotated; a pair of rotating iron cores arranged to partially pass through cutout portions of the superconducting magnets while being disposed symmetrically to each other with respect to the product to be heated, placed between the superconducting magnets; a fixing part for fixing the product to be heated; and a rotary drive unit for rotating the superconducting magnets.

Description

Superconducting Magnetic Rotary DC Induction Heating Equipment

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superconducting magnet rotating direct current induction heating apparatus, and more particularly, to a superconducting magnet rotating direct current induction heating apparatus for heating a product to be heated by rotating a superconducting magnet regardless of the shape of a metal.

Superconductors are devices whose electrical resistance is zero at cryogenic temperatures. It is already used in a variety of applications because it offers the advantages of high magnetic field, low loss and miniaturization compared to conventional copper (cu) conductors.

Superconducting magnets are magnets made from such superconductors. Superconducting magnets are used in MRI, NMR, particle accelerators and magnetic separators to improve efficiency and performance. In addition, its application technology is continuously being researched throughout the industry such as power cables, superconducting transformers, and superconducting motors. One of the applications is in the steel industry. In the steel industry, research and development on large-capacity induction heating apparatus is active.

Heating methods for induction heating apparatus can be divided into alternating current (AC) induction heating and direct current (DC) induction heating.

Alternating current induction heating is a method of applying an alternating current to a copper magnet to create a time varying magnetic field. However, since AC induction heating uses a copper magnet, the total energy efficiency of the system is only about 50 to 60% due to the heat generated by the resistance of the copper magnet. Therefore, superconducting magnets are sometimes used instead of copper magnets. This is to improve the energy conversion efficiency.

However, the superconducting wire, which is a material of a totally superconducting magnet, has a disadvantage in that magnetization loss occurs under the application of an alternating current. This means that cooling is necessary to maintain the superconducting state in the cryogenic operating environment, and thus there is a problem in that the operating cost increases with the installation cost of the cooling device.

On the other hand, direct current induction heating is a method of applying a direct current to the superconducting magnet to generate a uniform magnetic field and forcibly rotating the product by a motor in the magnetic field to heat it. Such direct current induction heating has the advantage of using a direct current to improve the overall system efficiency of the induction heating apparatus by more than 90% without generating heat loss of the superconducting magnet. In addition, since energy is transferred in proportion to the square of the magnetic field generated from the superconducting magnet, the heating time for the product to be heated can be shortened, thereby improving productivity.

The induction heating apparatus has been applied a lot of direct current induction heating method, and as the superconducting magnet for the direct current induction heating method, a race track type superconducting magnet is used a lot.

The superconducting wire used as the material of this superconducting magnet is very expensive. As such, there is an increasing demand for induction heating devices that can provide the desired capacity even if fewer superconducting wires are used under the same conditions.

Therefore, it is intended to propose a direct current induction heating apparatus capable of heating the product to be heated regardless of the appearance and size of the product to be heated.

The present invention is to solve the problems as described above, to provide a superconducting magnet rotary DC induction heating apparatus that can provide a desired capacity even if less superconducting wire is used.

In addition, the present invention is to provide a superconducting magnet rotary direct current induction heating apparatus that can heat the heating target product irrespective of the appearance and size of the heating target product.

In addition, the present invention is to provide a superconducting magnet rotary direct current induction heating apparatus that can be utilized in a variety of industries such as extrusion, forging by heating the heating target product irrespective of the appearance and size of the heating target product.

The superconducting magnet rotational direct current induction heating apparatus according to the present invention comprises a pair of superconducting magnets that are positioned symmetrically with respect to a heating target product and rotate to generate a magnetic field to heat the heating target product; A pair of rotating iron cores positioned symmetrically with respect to the heating target product positioned between the superconducting magnets and having a portion penetrating through the cutout of the superconducting magnet; A fixing part which fixes the product to be heated; And a rotation driver for rotating the superconducting magnet.

According to the present invention, even if less superconducting wire is used, it is possible to provide a desired capacity.

In addition, according to the present invention, the heating target product can be heated regardless of the appearance and size of the heating target product.

In addition, the present invention can be utilized in various industrial fields such as extrusion, forging by heating the heating target product irrespective of the appearance and size of the heating target product.

1 is a plan view showing a conventional direct current induction heating apparatus,

2 schematically shows a cross section of a direct current induction heating apparatus according to the present invention;

Figure 3a is a view showing a configuration as viewed from the front direct current induction heating apparatus according to the present invention,

Figure 3b is a view showing a configuration seen from the side of the direct current induction heating apparatus according to an embodiment of the present invention,

4 is a view showing a first embodiment to which a direct current induction heating device according to the present invention is applied;

5 is a view showing a second embodiment to which a direct current induction heating device according to the present invention is applied.

Technical terms used in the present invention are merely used to describe specific embodiments, it should be noted that it is not intended to limit the present invention. In addition, the technical terms used in the present invention should be interpreted as meanings generally understood by those skilled in the art unless the present invention has a special meaning defined in the present invention, and is excessively comprehensive. It should not be interpreted in the sense of or in the sense of being excessively reduced. In addition, when a technical term used in the present invention is an incorrect technical term that does not accurately express the spirit of the present invention, it should be replaced with a technical term that can be properly understood by those skilled in the art. In addition, the general terms used in the present invention should be interpreted as defined in the dictionary or according to the context before and after, and should not be interpreted in an excessively reduced sense.

Also, the singular forms used in the present invention include plural forms unless the context clearly indicates otherwise. In the present invention, terms such as “consisting of” or “comprising” should not be construed as necessarily including all of the various components or steps described in the invention, and some of the components or some of the steps are included. It should be construed that it may not be, or may further include additional components or steps.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, and the same or similar components will be given the same reference numerals regardless of the reference numerals, and redundant description thereof will be omitted.

In addition, in describing the present invention, when it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, it should be noted that the accompanying drawings are only for easily understanding the spirit of the present invention and should not be construed as limiting the spirit of the present invention by the accompanying drawings.

1 is a plan view showing a conventional direct current induction heating apparatus. Here, the DC induction heating apparatus 100 rotates the heating target product 120 which is a metal product to be heated in a uniform magnetic field and heats it to a desired temperature.

The conventional direct current induction heating apparatus 100 includes a pair of superconducting magnets 110 and 110 ', a pair of movable iron cores 130 and 130', and a pair of cryogenic cooling units 140 and 140 '. The heating target product 120 is configured to be positioned at a distance d between the pair of superconducting magnets 110 and 110 ′.

That is, the first superconducting magnet 110, the first movable iron core 130 and the first cryogenic cooling unit 140 is provided on one side with the heating target product 120 as the center, and the second superconducting magnet 110 on the other side. '), The second movable iron core 130' and the second cryogenic cooling unit 140 'are provided.

Here, the heating target product 120 is one side is connected to the motor shaft of the motor 150, the heating target product 120 is rotated at a constant speed by the drive of the motor 150 in a uniform magnetic field desired Allow to heat to temperature.

The direct current induction heating apparatus according to the present invention is a superconducting magnet rotary direct current induction heating apparatus, and the superconducting magnet is rotated while the heating target product is fixed to heat the heating target product, regardless of the appearance and size of the heating target product. To help. Hereinafter, the present invention will be described in detail through embodiments and drawings. However, for convenience of description, the superconducting magnet rotary DC induction heating apparatus will be referred to as a DC induction heating apparatus.

2 is a view schematically showing a cross section of a direct current induction heating apparatus according to the present invention.

Referring to FIG. 2, the DC induction heating apparatus 200 includes a pair of superconducting magnets 210 and 210 ', a heating target product 220, a pair of rotating iron cores 230 and 230', and a cryogenic cooling unit ( 240).

First, the pair of superconducting magnets 210 and 210 'rotate and generate a magnetic field to heat the heating target product. The first superconducting magnet 210 and the second superconducting magnet 210 'are positioned to have a predetermined distance. In this case, the shape of the superconducting magnet 210 is only an example of a race track shape, but is not limited thereto.

The product to be heated 220 is positioned between the first superconducting magnet 210 and the second superconducting magnet 210 '. The object to be heated 220 may be aluminum, copper, or the like as a nonmagnetic material. In this case, the shape of the product to be heated 220 is merely illustrated as an example of a cylindrical shape, but is not limited thereto.

The pair of rotatable iron cores 230 and 230 ′ are positioned to be symmetrical with respect to the heating target product 220. For example, the first rotating iron core 230 may be positioned on the first superconducting magnet 210, and the second rotating iron core 230 ′ may be positioned on the second superconducting magnet 210 ′. In this case, a portion of the first rotary iron core 230 and the second rotary iron core 230 ′ may penetrate the cutouts (not shown) of the first superconducting magnet 210 and the second superconducting magnet 210 ′, respectively. Is located.

The cryogenic cooling unit 240 has a pair of superconducting magnets 210 and 210 'located therein, and uses a cryogenic freezer or a refrigerant to maintain the superconducting properties of the pair of superconducting magnets 210 and 210'. Maintain a cryogenic environment. At this time, the inside of the vacuum is maintained to prevent the external thermal intrusion. In addition, the cryogenic cooling unit 240 is designed to be rotatable and rotates together with the pair of superconducting magnets 210 and 210 '.

Figure 3a is a view showing the configuration of the direct current induction heating apparatus according to the present invention, Figure 3b is a view showing the configuration of the direct current induction heating apparatus according to the present invention viewed from the side.

The first superconducting magnet 310 and the second superconducting magnet 310 'are positioned inside the cryogenic cooling unit 350, and the heating target product is located at the center of the first superconducting magnet 310 and the second superconducting magnet 310'. 320 may be located.

A portion of the first inner rotary iron core 330 and the second inner rotary iron core 330 'passes through the cutouts (not shown) of the first superconducting magnet 310 and the second superconducting magnet 310', respectively. Is located. At this time, the first inner rotary iron core 330 and the second inner rotary iron core 330 ′ are provided to be symmetrical with each other on the inner circumferential surface of the outer rotary iron core 340.

The first superconducting magnet 310, the second superconducting magnet 310 ′, the first inner rotating iron core 330, the second inner rotating iron core 330 ′ and the outer rotating iron core 340 rotate simultaneously. As the induced magnetic flux is generated in the heating target product 320 by the rotating magnetic flux, the heating target product 320 is heated.

Here, the cryogenic cooling unit 350 maintains the cryogenic environment even when rotating using a cryogenic freezer or a refrigerant, and maintains the inside thereof in a vacuum to prevent external heat invasion.

On the other hand, the product to be heated 320 is fixed by a fixing part (not shown).

Hereinafter, two embodiments to which the direct current induction heating apparatus according to the present invention is applied will be described with reference to FIGS. 4 and 5. At this time, the description of the components overlapping with the above-described drawings will be omitted.

4 is a view showing a first embodiment to which a direct current induction heating apparatus according to the present invention is applied, and shows a case where the direct current induction heating apparatus is rotated by a motor.

The DC induction heating apparatus and the motor 420 are coupled by the coupling 410, and constitute a first superconducting magnet 310, a second superconducting magnet 310 ′, and a first internal rotating iron core constituting the DC induction heating apparatus. 330, the second inner rotary iron core 330 ′ and the outer rotary iron core 340 are rotated by the motor 420. The rotational speed is determined by the driving speed of the motor, and the strength of the magnetic field is controlled to obtain the target rotational torque.

FIG. 5 is a view showing a second embodiment to which a direct current induction heating device according to the present invention is applied, and shows a case where the direct current induction heating device rotates by an armature coil that generates a rotating magnetic field without a motor.

Specifically, the armature enclosure 510 is configured to surround the outside of the direct current induction heating apparatus, and a plurality of armature cores 520 are provided on the inner circumferential surface of the armature enclosure 510 at regular intervals. In this case, the armature coils 530 are wound around the plurality of armature cores 520, respectively.

When the current in the same direction is flowed to each opposite phase of the armature coil 530, two opposite phases having opposite winding directions have poles in opposite directions. Then, the superconducting magnets 210 and 210 'having the N pole and the S pole are rotated to face the two poles. At this time, when current is sequentially applied to the other opposite poles of the armature coil 530, the superheated magnet is rotated and the heating target product 220 fixed at the center is heated.

Features, structures, effects, and the like described in the above embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. In addition, the features, structures, effects, and the like illustrated in the embodiments may be combined or modified with respect to other embodiments by those skilled in the art to which the embodiments belong.

Therefore, contents related to such combinations and modifications should be construed as being included in the scope of the present invention. In addition, the above description has been made with reference to the embodiments, which are merely examples and are not intended to limit the present invention, and those skilled in the art to which the present invention pertains may be illustrated as above without departing from the essential characteristics of the present embodiments. It will be appreciated that various modifications and applications are possible. For example, each component specifically shown in the embodiments may be modified. And differences relating to such modifications and applications will have to be construed as being included in the scope of the invention defined in the appended claims.

Claims (10)

1. A pair of superconducting magnets positioned symmetrically with respect to the heating target product and rotating to generate a magnetic field to heat the heating target product;

   A pair of rotating iron cores positioned symmetrically with respect to the heating target product positioned between the superconducting magnets and having a portion penetrating through the cutout of the superconducting magnet;

   A fixing part which fixes the product to be heated; And

   A superconducting magnet rotary direct current induction heating apparatus comprising a rotation drive unit for rotating the superconducting magnet.
2. The method of claim 1,

   The superconducting magnet,

   A superconducting magnet rotary direct current induction heating device, characterized in that it is circular or race track shape.
3. The method of claim 1,

   The pair of rotary iron cores,

   A superconducting magnet rotating direct current induction heating apparatus, characterized in that provided on the inner circumferential surface of the circular external rotating iron core.
4. The method of claim 1,

   The superconducting magnet,

   A superconducting magnet rotary direct current induction heating device, characterized in that located inside the cryogenic cooling unit to maintain a cryogenic environment using a cryogenic freezer or a refrigerant.
5. The method of claim 4, wherein

   The cryogenic cooling unit,

   A superconducting magnet rotary direct current induction heating device, characterized in that the interior is maintained in a vacuum.
6. The method of claim 5,

   The cryogenic cooling unit,

   And a superconducting magnet rotating direct current induction heating device, characterized in that rotated together with the superconducting magnet.
7. The method of claim 1,

   The rotation drive unit,

   A superconducting magnet rotating direct current induction heating device, characterized in that for rotating the superconducting magnet by a motor.
8. The method of claim 7, wherein

   The rotation drive unit,

   The superconducting magnet rotational direct current induction heating apparatus, characterized in that for controlling the rotational speed of the superconducting magnet by adjusting the drive speed of the motor.
9. The method of claim 1,

   The rotation drive unit,

   A superconducting magnet rotating direct current induction heating device, characterized in that for rotating the superconducting magnet using a rotating magnetic field generated by an armature coil.
10. The method of claim 9,

    The rotation drive unit,

    Armature enclosure;

    A plurality of armature cores provided at predetermined intervals on an inner circumferential surface of the armature enclosure; And

    And an armature coil wound around each of the plurality of armature iron cores.

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