KR101615555B1 - Eddy current heating device using magnetic substance - Google Patents

Abstract

An eddy current heating apparatus according to an embodiment of the present invention includes: at least two disk-shaped rotors having a plurality of grooves formed at regular intervals along a circumferential direction on a surface of an outer circumference; A rotating shaft rotatably connected to the rotors at regular intervals; A plurality of magnetic bodies provided in the plurality of grooves, wherein N poles and S poles are alternately arranged in an outward direction of the surface; And a plurality of hot water pipes facing the same direction as the rotation axis and spaced apart from the rotors and spaced apart at regular intervals along the circumferential direction. According to the embodiment of the present invention, there is an advantage that the braking force of the eddy current heating device is reduced, the thermal efficiency is increased, and each component is modularized to facilitate maintenance and management.

Description

TECHNICAL FIELD [0001] The present invention relates to an eddy current heating device using a magnetic body,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eddy current heating device using a magnetic body and more particularly to a eddy current heating device using a magnetic body, ≪ / RTI >

Recently, as the energy problem emerges as a social issue, research on alternative energy is actively under way. Particularly, the heating device using the eddy current has higher heat efficiency than the conventional fossil fuel, and there is no problem of environmental pollution, so active research has been conducted.

Eddy current or foucault current refers to the current flowing in the form of a vortex in the conductor due to the electromotive force generated inside the conductor. As a method of generating an eddy current, there is a method of generating a conductor by moving it in a magnetic field, or by changing a magnetic flux.

The technologies using this eddy current include an eddy current braking device and an eddy current heating device.

In the case of an eddy current braking device, the eddy current is a current that resists the change of the magnetic field, and this is an effect that hinders the movement of the moving magnetic body. This braking effect can be applied to a brake and used in a vehicle or the like.

The general mechanism of the eddy current heating device is as follows. In the method of generating the eddy current by changing the magnetic flux, when the polarities of the magnetic bodies alternate (that is, N and S poles) alternately, the magnetic flux connecting the conductors around the magnetic bodies changes with time. Joule heat is generated when an eddy current is generated in a direction crossing the magnetic flux. At this time, the direction of the current is generated in a direction that generates a magnetic field opposite to the change of the magnetic field applied to the conductor.

When an eddy current is generated, in addition to the exothermic effect, a braking effect is inevitably accompanied. In particular, the eddy current heating device generates strong braking force at the initial drive, so that it can be used as a contactless braking device for a high-speed railway. Therefore, in order to make an efficient eddy current heating device, not only the initial braking force is minimized, but also a heating effect for eddy current is secured.

An object of the present invention is to provide an eddy current heating apparatus capable of minimizing the initial braking force of the eddy current heating apparatus and increasing the thermal efficiency.

An eddy current heating apparatus according to an embodiment of the present invention includes at least one rotor having a plurality of grooves formed at regular intervals along a circumferential direction on a surface thereof; A rotating shaft connected to the at least one rotor in a vertical direction; A plurality of magnetic bodies provided in the plurality of grooves, wherein N poles and S poles are alternately arranged in an outward direction of the surface; And a plurality of hot water pipes facing the same direction as the rotation axis and spaced apart from the rotor and spaced apart from each other at regular intervals along the circumferential direction, wherein the hot water pipes may have different diameters of the inlet port and the outlet port.

As an embodiment, the apparatus may further include valves provided at the inlet and outlet of the plurality of hot water pipes to regulate the respective flow rates.

As another embodiment, the air conditioner may further include an air gap adjusting unit coupled to the plurality of hot water pipes and adjusting the gap between the rotor and the plurality of hot water pipes.

In yet another embodiment, the gap adjustment may be adjusted to simultaneously increase or decrease the gap between the rotor and the plurality of hot water tubes about the axis of rotation.

In yet another embodiment, the plurality of magnetic bodies may be a samarium cobalt magnet.

In another embodiment, the plurality of hot water pipes may be made of copper or aluminum.

The eddy current heating system according to an embodiment of the present invention includes a rotor having a blade rotated by wind, a power transmitting device receiving power applied to the rotor, and a eddy current heating device receiving power from the power transmitting device Wherein the eddy current heating device comprises: at least one rotor having a plurality of grooves formed on a surface thereof at regular intervals along a circumferential direction; A rotating shaft connected to the at least one rotor in a vertical direction; A plurality of magnetic bodies coupled to the plurality of grooves and having N poles and S poles disposed alternately in an outward direction of the surface; And a plurality of hot water pipes facing the same direction as the rotation axis and spaced apart from the rotor and spaced apart from each other at regular intervals along the circumferential direction, wherein the hot water pipes may have different diameters of the inlet port and the outlet port.

As an embodiment, the apparatus may further include a battery connected to the rotor and converting the kinetic energy generated by the rotating rotor into electrical energy and storing the converted kinetic energy.

According to the embodiment of the present invention, there is an advantage that the braking force of the eddy current heating device is reduced, the thermal efficiency is increased, and each component is modularized to facilitate maintenance and management.

1 is a view showing an eddy current heating apparatus according to an embodiment of the present invention.
FIG. 2 is a detailed view of the rotor shown in FIG. 1. FIG.
FIG. 3A is a view showing in detail the portion 116 of FIG.
FIG. 3B is a view showing in detail the portion 116 of FIG.
4 is a view showing an example in which a plurality of rotors are coupled to a rotation axis according to an embodiment of the present invention.
5 is a view showing an example in which a hot water tube portion is disposed around a rotor according to an embodiment of the present invention.
FIG. 6 is a detailed view of the hot water pipe shown in FIG. 5. FIG.
7 is a view showing an eddy current heating system to which an eddy current heating apparatus according to an embodiment of the present invention is applied.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and should provide a further description of the claimed invention. Reference numerals are shown in detail in the preferred embodiments of the present invention, examples of which are shown in the drawings. Wherever possible, the same reference numbers are used in the description and drawings to refer to the same or like parts.

In the following, an eddy current heating apparatus is used as an example for explaining the features and functions of the present invention. However, those skilled in the art will readily appreciate other advantages and capabilities of the present invention in accordance with the teachings herein. The invention may also be embodied or applied in other embodiments. In addition, the detailed description may be modified or changed in accordance with the viewpoint and use without departing from the scope, technical thought and other objects of the present invention.

1 is a view showing an eddy current heating apparatus 100 according to an embodiment of the present invention.

1, the eddy current heating apparatus 100 may include a rotor 110, a rotating shaft 120, and a hot water pipe 130. [ The rotating shaft 120 may be inserted into the center of the rotor 110 and rotated about the rotating shaft 120. [ The number of the rotors 110 connected to the rotating shaft 120 may be five, as shown in the figure, but may be more or less depending on the embodiment. The hot water tube portion 130 may be spaced apart from the rotor 110 by a predetermined distance and may be disposed at regular intervals around the rotor 110. However, according to the embodiment, the plurality of hot water pipe portions 130 may be arranged to be in contact with each other. Also, a plurality of hot water tubes 130 may be disposed around the rotor 110.

The eddy current heating apparatus 100 according to the embodiment of the present invention can minimize the initial braking force and increase the thermal efficiency due to eddy currents. When a motor (not shown) connected to the rotating shaft 120 is driven and the rotor 110 rotates, the eddy current generated in the hot water tube portion 130 generates heat, thereby heating the hot water tube portion 130. The braking force of the eddy current heating apparatus 100 is proportional to the magnitude of the eddy current generated in the conductor. Therefore, if the magnitude of the eddy current is reduced, the braking force applied to the eddy current heating apparatus 100 can also be reduced. Therefore, in order to reduce the area of the conductors (i.e., the hot water tube portions) that are in contact with the magnets attached to the rotor 110, the plurality of hot water tube portions 130 may be disposed at regular intervals. By doing so, the braking force applied to the eddy current heating apparatus 100 can be minimized.

Further, the eddy current heating apparatus 100 may further include a gap adjusting unit (not shown). The gap adjustment unit (not shown) may be connected to the plurality of hot water tubes 130 to adjust the gap between the plurality of hot water tubes 130 and the rotor 110. That is, by controlling the gap, the braking force applied to the eddy current heating apparatus 100 can be controlled, or the heat generation due to the eddy current can be controlled.

FIG. 2 is a detailed view of the rotor 110 shown in FIG. The rotor 110 is a part to which the magnetic body 114 is attached in order to change the magnetic flux generated by the magnetic body 114 to induce an eddy current. The rotor 110 may be made of a metal material in the form of a round disc.

Grooves 112 may be provided. The plurality of grooves 112 may be circumferentially formed on the surface of the rotor 110 to couple the plurality of magnetic bodies 114. The plurality of grooves 112 may be formed in an even number since the magnetic bodies 114 must be disposed alternately with the N pole and the S pole alternately. According to the embodiment, the number of the plurality of grooves 112 may be 40.

Magnetic bodies 114 may be provided. The magnetic body 114 generates an eddy current when the rotor 110 rotates to heat the hot water pipe 130. Specifically, the magnetic bodies 114 may be arranged such that the north poles and the south poles are alternately directed in the outer direction of the side surface of the rotor 110. The number of the magnetic bodies 114 may be an even number because the two magnets constitute one set and each of the N pole and the S pole is arranged to face the outer side of the side surface of the rotor 110. [ That is, the N pole and the S pole are arranged alternately in order to change the magnetic flux to generate the eddy current. For example, the number of the magnetic bodies 114 may be 40, such as the number of the grooves 112.

The magnetic body 114 may be a permanent magnet. According to an embodiment, the magnetic body 114 may be a magnetic body made of samarium cobalt. Samarium cobalt is an intermetallic compound (SmCo ₅ ) of samarium (Sm) and cobalt (Co), and the coercive force is much larger than that of ferrite. The samarium cobalt magnetic material has a maximum operating temperature of about 350 ° C, which is a magnetic material having little demagnetizing due to its high temperature stability. Especially, in applying a samarium cobalt magnet to an eddy current heating device, the magnitude of heat resistance temperature and magnetic force is very important. According to the embodiment, the heat resistant temperature of the magnetic material 114 may be 300 占 폚 or higher and the magnetic force may be 3000 gauss or higher. Magnetic body 114 may be made of a neodymium magnet, a ferrite magnet, or an AlNiCo (AlNiCo) magnet, depending on the embodiment, although it is obvious that the magnetic body 114 is not limited to a samarium cobalt magnetic body. AlNiCo) magnet.

A hole 122 may be provided in the center of the rotor 110 so that the rotary shaft 120 can be inserted. The rotor 110 and the rotary shaft 120 can be separated from each other so as not to be integrated, so that the eddy current heating device can be modularized. For example, the magnetic material 114 or the rotor 110 can be easily replaced when the magnetic force of the magnetic material 114 is weakened by alternately arranging the magnetic material 114, which is a ferromagnetic material.

The rotary shaft fixing groove 124 may be provided on the inner surface of the hole 122. [ The rotation axis fixing groove 124 is for allowing the rotation axis 120 inserted in the hole 122 to be fastened to the hole 122.

Figs. 3A and 3B are views showing in detail the portion 116 of Fig.

Referring to FIG. 3A, the magnetic material 114a may be modularized to facilitate detachment. This is because, even if the magnetic body 114a is used as a permanent magnet, magnetic forces can be changed by the influence of the magnetic field when the N-pole and S-pole are arranged alternately with the samarium cobalt ferromagnetic body. Further, the groove 112a and the magnetic material 114b may have a trapezoidal shape. When the rotor 110 shown in Fig. 2 rotates at a high speed (for example, 1800 RPM or more), there is a fear that the magnetic body is separated by the centrifugal force. Therefore, it can be manufactured in a trapezoidal shape in order to prevent separation during rotation and facilitate the detachment of the magnetic material 114b. According to the embodiment of the present invention, the area of the magnetic body 114a exposed in the outer direction of the side surface of the rotor 110 may be 6 cm2.

Referring to FIG. 3B, the groove 112b and the magnetic material 114b may be in the form of a circular cut part. To prevent the magnetic material 114b from separating from the groove 112b while the rotor 110 is rotating. A detailed description thereof will be omitted since it is the same as described above.

4 is a view showing an example in which a plurality of rotors are coupled to a rotation axis according to an embodiment of the present invention.

Referring to FIG. 4, a plurality of rotors 110-1 to 110-5 may be coupled to the rotating shaft 120 at regular intervals. The support panel 118 can be attached to the upper surface of the rotor and the lower surface opposite to the upper surface, respectively, and fixed with the fastening bolt 119. So as to prevent the magnetic bodies 114 from deviating in the direction in which the rotating shaft 120 is placed. In addition, the magnetic bodies 114 are easily detachable and modularized. The number of magnetic bodies 114 to be attached per rotator is 40, and a total of 200 magnetic bodies 114 can be provided. Since the surface area of one magnetic body exposed in the lateral direction of the rotor is 6 cm2, it can be 1200 cm2 in total. The area of the magnetic bodies 114 can be widened by increasing the number of rotors or by increasing the number of the magnetic bodies 114 attached to the rotor. However, at this time, since the magnitude of the eddy current and the braking force applied to the rotors 110-1 to 110-5 also become stronger, the number and the area of the magnetic materials 114 are optimized as described above, can do.

5 is a view showing an example in which a hot water tube portion is disposed around a rotor according to an embodiment of the present invention. A plurality of hot water tubes 130 may be disposed around the rotor. 1 and 5, the plurality of hot water tubes 130 may be disposed at a predetermined interval from the rotor 110 in the direction of the rotary shaft 120, respectively. Although the hot water tubes 130 are arranged in contact with each other, the plurality of hot water tubes 130 may be spaced apart from each other according to an embodiment of the present invention. The hot water pipe 130 may be made of copper or aluminum. However, it is not limited to this, and it is obvious that it can be made of a copper aluminum alloy, or another metal material having good thermal conductivity. When a motor (not shown) connected to the rotary shaft (not shown in the drawing) is driven to rotate the rotor 110, jelly heat is generated due to the eddy currents generated in the hot water tube 130 to heat the hot water tubes 130 have.

At the same time, the braking force can be generated in a direction that interferes with the rotation of the rotating rotor 110. Since the exothermic effect and the braking force effect due to the eddy current are a trade-off relationship, it is important to reduce the eddy current brake effect while achieving the exothermic effect by the eddy current. In order to solve this problem, it is important to properly arrange the rotor 110 and a plurality of hot water pipes 130 disposed in the periphery.

The braking force applied to the rotor 110 of the eddy current heating apparatus 100 is proportional to the magnitude of the eddy current generated in the conductor (for example, the hot water tube portion). Therefore, if the magnitude of the eddy current is reduced (for example, the area of the metal disposed around the magnetic body is reduced), the braking force applied to the eddy current heating apparatus 100 can also be reduced. Accordingly, in order to reduce the area of the conductor (i.e., the hot water tube portion) disposed apart from the magnetic body (114 of FIG. 4) attached to the rotor 110, the respective hot water tube portions 130 are arranged . By doing so, the braking force applied to the rotor (110 in Fig. 1) can be reduced. According to the embodiment of the present invention, the hot water pipe portion 130 may be in the form of a metal rod whose cross section is circular, and the number thereof may be 50 pieces.

In addition, the gap between the rotor 110 and the plurality of hot water tubes 130 can be adjusted by a gap adjuster (not shown). The gap adjuster (not shown) may be connected to the plurality of hot water tubes 130 to adjust the gap between the rotor 110 and the plurality of hot water tubes 130. For example, the gap between the rotor 110 and the plurality of hot water tubes 130 can be adjusted in such a way that they are simultaneously increased or decreased simultaneously with the rotation axis (120 in FIG. 1). That is, it is possible to control the braking force applied to the eddy current heating apparatus (100 of FIG. 1) by controlling the gap, or to control the heat generation by the eddy current.

FIG. 6 is a detailed view of the hot water pipe shown in FIG. 5. FIG. Referring to FIG. 6, the inner diameter of the hot water pipe 130 may be different. That is, the diameters of the inlet port through which the hot water flows into the hot water pipe section 130 and the outlet port through which the water is discharged may be different from each other, and the diameter may gradually increase from the inlet port to the outlet port. However, according to the embodiment, the diameter may gradually become narrower from the inlet to the outlet. In this way, the diameter of the inlet and outlet of the hot water pipe 130 is different from that of the hot water pipe 130, so that the hot water can be heated more efficiently by controlling the flow rate. According to Bernoulli's theorem, the velocity of the fluid increases as it flows through narrow passages and decreases as it flows through wide passages. Therefore, by changing the diameter of the inlet port and the outlet port, it is possible to increase the time for which hot water remains in the hot water pipe section 130, thereby achieving efficiency. For example, the diameters of the inlet and outlet may be 20 mm and 30 mm, respectively.

A valve (not shown) may additionally be provided to the inlet and outlet to differentiate the inlet and outlet of the hot water pipe 130. The valve is also designed to allow the hot water tube 130 to maintain the hot water for as long as necessary.

7 is a view showing an eddy current heating system to which an eddy current heating apparatus according to an embodiment of the present invention is applied. The eddy current heating system 1000 may include an eddy current heating device 100, a blade 200, a power transmitting device 300, and a battery 400. Since the operation method of the eddy current heating apparatus 100 is as described above, a detailed description thereof will be omitted. The blade 200 can be rotated by wind (wind force). The power transmission device 300 is a device for transmitting power to the eddy current heating device 100, and may include a plurality of gears (not shown), bearings (not shown), and the like. The power transmission apparatus 300 may be connected to the rotation shaft 120 shown in FIG. 1 to rotate the rotor (110 in FIG. 1). The battery 400 may be provided for the case where the blade 200 can not drive the power transmission device 300 due to irregular winds, and may convert kinetic energy by wind power and store the energy in the form of electric energy.

According to an embodiment of the present invention, a plurality of magnetic bodies are inserted into a rotor at regular intervals, a plurality of hot water tube portions are arranged at a predetermined interval from each other, and a flow rate is adjusted by varying a diameter of the inlet and outlet of the hot water tube portion have. As a result, the braking force applied to the rotor can be reduced and the thermal efficiency can be increased. Further, the rotor, the rotary shaft, the hot water pipe, and the like can be easily separated and modularized to facilitate management and repair.

It will be apparent to those skilled in the art that the structure of the present invention can be variously modified or changed without departing from the scope or spirit of the present invention. In view of the foregoing, it is intended that the present invention cover the modifications and variations of this invention provided they fall within the scope of the following claims and equivalents.

100: eddy current heating device 110: rotor
112: groove 114: magnetic body
118: support panel 119: fastening bolt
120: rotation axis 122: hole
124: rotary shaft fixing groove 130: hot water tube
200: Blade 300: Power transmission device
400: Battery 1000: Eddy current heating system

Claims (7)

At least two disk-shaped rotors having a plurality of grooves formed on a surface of an outer circumferential surface at regular intervals along a circumferential direction;
A rotating shaft rotatably connected to the rotors at regular intervals;
A plurality of magnetic bodies provided in the plurality of grooves, wherein N poles and S poles are alternately arranged in an outward direction of the surface; And
And a plurality of hot water pipes facing the same direction as the rotary shaft and spaced apart from the rotors so as to be spaced at regular intervals along the circumferential direction.
The method according to claim 1,
Wherein the plurality of grooves and the plurality of magnetic bodies are a trapezoidal shape or a partially cut circular shape whose cross section perpendicular to the rotation axis is widened toward the rotation axis.
The method according to claim 1,
Wherein the rotors have a disc shape in which an outer peripheral portion formed with the plurality of grooves, a hole connected to the rotating shaft, and an inner peripheral portion formed with a rotary shaft fixing groove are protruded thicker than the middle portion.
4. The method according to any one of claims 1 to 3,
Wherein the support plates for preventing the plurality of magnetic bodies from deviating in the direction in which the rotation axis is laid are further fixed by fastening bolts on both sides of the rotors opposite to each other.
5. The method of claim 4,
The rotors are made of a metal material,
Wherein the plurality of hot water pipes are metal rods having a circular cross section.
5. The method of claim 4,
And an air gap adjusting unit coupled to the plurality of hot water pipes and adjusting the gap between the rotors and the plurality of hot water pipes.
5. The method of claim 4,
Wherein the plurality of magnetic bodies are samarium cobalt magnets or neodymium magnets.

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