WO2016068568A1

WO2016068568A1 - Electromagnetic wave heating apparatus

Info

Publication number: WO2016068568A1
Application number: PCT/KR2015/011363
Authority: WO
Inventors: 김형석
Original assignee: 김형석
Priority date: 2014-10-27
Filing date: 2015-10-27
Publication date: 2016-05-06
Also published as: KR101579882B1

Abstract

Disclosed is an electromagnetic wave heating apparatus that can prevent a spark from being generated by electrons emitted from the tip end portion of a diffused reflection member when microwaves are projected into a chamber that has the diffused reflection member installed therein. The electromagnetic wave heating device, according to an embodiment, comprises: a main body having a chamber formed therein; an electromagnetic wave generation unit that projects electromagnetic waves into the chamber; a first diffused reflection member that is provided on the inner surface of the chamber and includes a reflection surface on which a plurality of first protrusions for diffused reflection of the electromagnetic waves are formed; and a discharge preventing member brought into contact with the reflection surface to fill the spaces between the plurality of first protrusions.

Description

Electromagnetic heating device

An electromagnetic wave heating device is disclosed.

The electromagnetic heating device uses a microwave generated by a microwave generator, such as a microwave oven, to heat a substance, thereby causing diffuse reflection at the interface of the electromagnetic heating device, thereby providing a uniform electromagnetic field distribution in the region in which the heating object is placed. Refers to, refers to a device capable of uniformly heating the material to be heated.

Inside the chamber of the electromagnetic heating device may be provided with a metallic reflective member having a rugged surface. When the reflective member is provided in this way, electromagnetic waves irradiated into the electromagnetic wave heating device are diffusely reflected at the surface of the reflective member, so that the electric field is uniformly distributed in the material to be heated, thereby heating them evenly.

However, when heating is performed using the electromagnetic wave heating apparatus provided with the reflection member, a strong electric field is formed in the tip portion of the reflective member, so that some of the electrons in the tip portion are discharged into the chamber. The released electrons ionize adjacent air molecules, causing a discharge to spark. The discharge phenomenon generated in the electromagnetic wave heating device is very dangerous because it leads to an explosion or fire.

Disclosed is an electromagnetic wave heating apparatus capable of preventing a discharge phenomenon from occurring at a tip portion of a diffuse reflection member when the electromagnetic waves are irradiated into a chamber provided with the diffuse reflection member.

In order to solve the above problems, an electromagnetic wave heating apparatus according to an embodiment includes an electromagnetic wave generating unit including a main body in which a chamber is formed therein, a magnetron for irradiating electromagnetic waves into the chamber, and an inner surface of the chamber and the electromagnetic wave It may include a first diffuse reflection member comprising a reflective surface formed with a plurality of first projections for diffuse reflection, and a discharge preventing member in contact with the reflective surface to be filled between the plurality of first projections.

The discharge preventing member is characterized in that the insulator.

The electromagnetic wave heating apparatus may further include a second diffuse reflection member that is installed at one side of the chamber and includes a reflective surface on which a plurality of second protrusions for diffuse reflection of the electromagnetic waves are formed.

The discharge preventing member may contact the reflective surface on which the plurality of second protrusions are formed to be filled between the plurality of second protrusions.

The electromagnetic wave heating device may further include a pressing panel for flattening the surface of the material placed in the chamber and preventing gas discharge.

In order to solve the above problems, the electromagnetic wave heating apparatus according to another embodiment is a diffuse reflection member including a reflection surface formed with a plurality of projections for diffuse reflection of electromagnetic waves, and the contact with the reflection surface so as to fill the side of the plurality of projections It may include a discharge preventing member.

By filling an insulator through which electromagnetic waves can penetrate the reflective surface of the diffuse reflection member, it is diffusely reflected by the electromagnetic diffuse reflection member and at the same time, even if electrons at the tip portion are emitted into the chamber by an electric field strongly formed at the tip portion of the diffuse reflection member, Until the dielectric breakdown phenomenon occurs, the ionizable air molecules are not present in the region filled with the non-conductor, thereby preventing the discharge phenomenon due to the ionization of the surrounding air molecules.

1 is a diagram illustrating an appearance of an electromagnetic wave heating apparatus according to an embodiment.

2 is a diagram illustrating an interior of an electric field space of an electromagnetic wave heating apparatus according to an embodiment.

FIG. 3 is a cross-sectional view taken along the line AA ′ of FIG. 1.

4 is an enlarged view illustrating an enlarged area B of the chamber in FIG. 3 and illustrates an example of an upper surface of the chamber.

FIG. 5A is an enlarged view illustrating an enlarged area C of a side surface of the chamber in FIG. 3 and illustrates an example of a side surface of the chamber.

FIG. 5B is an enlarged view illustrating an enlarged area C of the side of the chamber in FIG. 3 and illustrates another example of the side of the chamber.

FIG. 5C is an enlarged view illustrating a C region, which is a side surface of the chamber, in FIG. 3 and illustrates another example of the side surface of the chamber.

6 is a view for explaining the reason why gas discharge is suppressed when the projection of the diffuse reflection member is formed convexly into the chamber as compared with the case where the projection of the diffuse reflection member is concave to the outside of the chamber.

7 is a sectional view of an electromagnetic wave heating apparatus according to another embodiment.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only the embodiments may make the posting of the present invention complete and common knowledge in the technical field to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims.

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used in a sense that can be commonly understood by those skilled in the art. In addition, the terms defined in the commonly used dictionaries are not ideally or excessively interpreted unless they are specifically defined clearly.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In this specification, the singular also includes the plural unless specifically stated in the doorway. As used herein, "comprises" and / or "comprising" does not exclude the presence or addition of one or more other components in addition to the mentioned components.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

The electromagnetic wave heating apparatus refers to a device for heating a material using electromagnetic waves generated by an electromagnetic wave generator including a magnetron. Examples of the electromagnetic heating apparatus include a microwave oven and a microwave digestion system. In the following description, a case where the electromagnetic wave heating device is a microwave oven will be described as an example.

1 is a perspective view illustrating an appearance of a microwave oven 100 as an electromagnetic wave heating apparatus according to an embodiment, and FIG. 2 is a diagram illustrating an interior of an electric field space of the microwave oven 100 according to an embodiment. FIG. 3 is a cross-sectional view taken along the line AA ′ of FIG. 1.

1 to 3, the microwave oven 100 includes a main body 10 having a chamber 30 formed therein, and a door 20 that opens and closes an open surface provided on the front surface of the main body 10. .

The main body 10 includes an outer body 11 and an inner body 12. Specifically, the exterior of the main body 10 is formed by the outer body 11, and the chamber 30 inside the main body 10 is formed by the inner body 12. The outer body 11 and the inner body 12 may be formed of a metal material.

The control panel 40 is disposed at one side of the main body 10. For example, the control panel 40 may be disposed in front of the main body 10. The control panel 40 may include a plurality of operation buttons 41 for controlling various functions of the microwave oven 100. The operation button 41 is a button for setting a heating time, an execution button for heating a substance for a set heating time, a pause button for temporarily stopping a heating operation, and a heating operation or a temporary heating operation. It may include at least one of the cancel button for canceling the stopped heating operation.

In addition, the control panel 40 may further include a display unit 42 for displaying an operation state of the microwave oven 100. The display unit 42 may display, for example, the total heating time, the remaining heating time, and other guide messages.

The material to be heated is placed in the chamber 30. Examples of the material to be heat treated include food and metal powder to be melted.

The electric field space 60 is formed around the chamber 30. For example, the electric field space 60 may be formed on the side of the chamber 30 as shown in FIG. However, the arrangement position of the electric field space 60 is not limited to the side of the chamber 60. Although not shown in the drawing, the electric field space 60 may be formed on the rear surface of the chamber 30.

Various components of the microwave oven 100 may be installed in the electric field space 60. For example, the magnetron 61, the heat dissipation fan 63, the high voltage transformer 64, and the high voltage capacitor 65 may be installed in the electric field space 60.

The high voltage transformer 64 and the high voltage capacitor 65 boost the commercial voltage and supply the same to the magnetron 61.

The heat dissipation fan 63 is for heat dissipation of the electric field space 60, and may be disposed at the rear of the electric field space 60. For example, it may be disposed behind the magnetron 61.

Magnetron (61) is a high output two-pole vacuum tube, and generates electromagnetic waves (microwaves). The shield 62 is mounted around the magnetron 61. Shield 62 shields and supports the periphery of magnetron 61. In addition, the shield 62 serves to guide the electromagnetic wave generated by the magnetron 61 into the chamber 30. Electromagnetic waves guided by the shield 62 are irradiated into the chamber 30 through an opening formed in the inner body 12 of the main body 10. Although FIG. 3 shows the case where an opening is formed in the side surface of the chamber 30, the position of an opening is not limited to this. According to another embodiment, the opening may be formed on the upper or lower surface of the chamber 30.

Electromagnetic waves irradiated into the chamber 30 through the openings are diffusely reflected by the first diffuse reflection member 14 or the second diffuse

reflection member

15 and 16 disposed inside the chamber 30. Here, the first diffuse reflection member 14 and the second diffuse

reflection member

15 and 16 will be described with reference to FIGS. 4 to 6.

First, the first diffuse reflection member 14 disposed on the upper surface of the chamber 30 will be described with reference to FIG. 4. 4 is an enlarged view illustrating an enlarged area B of the chamber 30 in FIG. 3 and illustrates an example of an upper surface of the inner body 12 of the chamber 30.

Referring to FIG. 4, a plurality of first protrusions 14a may be formed on the reflective surface of the first diffuse reflection member 14. The plurality of first protrusions 14a may have a pointed tip. In addition, the plurality of first protrusions 14a may have a minute size. For example, the height of the vertex of the first protrusion 14a or the radius of curvature of the vertex may be several mm or less. In addition, the plurality of first protrusions 14a may have a predetermined size or may have different sizes. In addition, the plurality of first protrusions 14a may be regularly arranged or irregularly arranged.

The first diffuse reflection member 14 may be included in a portion of the inner body 12. For example, as illustrated in FIG. 4, the first diffuse reflection member 14 may be formed in an area of the inner body 12 that forms the upper surface of the chamber 30. Although not shown in the drawings, the diffuse reflection member may be formed of a metal material separate from the inner body 12, and may be fixed to the upper surface of the chamber 30. 4 illustrates a case where the first diffuse reflection member 14 is formed on the upper surface of the chamber 30 among the inner bodies 12, but the first diffuse reflection member 14 may be formed on the lower surface or the side surface of the chamber 30. .

According to the embodiment, the discharge preventing member 13 is disposed on the reflective surface side of the first diffuse reflection member 14. The discharge preventing member 13 includes a first surface disposed toward the reflective surface of the first diffuse reflection member 14 and a second surface disposed toward the interior of the chamber 30.

The first surface of the anti-discharge member 13 may be in contact with the reflective surface of the first diffuse reflection member 14. To this end, the first surface of the discharge preventing member 13 preferably has a shape corresponding to the shape of the reflective surface of the first diffuse reflection member 14. In other words, the first surface of the discharge preventing member 13 is preferably filled between the plurality of first protrusions 14a formed on the reflective surface of the first diffuse reflection member 14.

The second surface of the discharge preventing member 13 may be formed flat, as shown in FIG. However, the second surface of the discharge preventing member 13 does not necessarily have to be flat, and the second surface may have a bend.

The discharge preventing member 13 may be made of, for example, an insulator having an electrical resistance of 10 ⁸ kV cm or more. Examples of the insulator include ceramics, glass, and heat-resistant plastics, but are not limited thereto.

When the discharge preventing member 13, which is an insulator, is disposed on the reflective surface side of the first diffuse reflection member 14, the surroundings of electrons emitted by the strong electric field generated in the first projection 14a of the first diffuse reflection member 14 are observed. Since there exists a solid member forming an insulator instead of air molecules to be ionized, it is possible to prevent discharge from occurring in the chamber 30 until the dielectric breakdown of these members occurs. In addition, since the electromagnetic wave irradiated into the chamber 30 is diffusely reflected by the reflective surface of the first diffuse reflection member 14 through the discharge preventing member 13, the electromagnetic wave may be uniformly absorbed by the material to be heated.

Next, referring to FIGS. 5A to 5C, the second diffuse

reflection members

15 and 16 disposed on the side surface of the chamber 30 will be described.

FIG. 5A is an enlarged view illustrating an area C of the side of the chamber 30 in FIG. 3 and illustrates an example of the side of the chamber 30.

Referring to FIG. 5A, the second diffuse reflection member 15 disposed on the side surface of the chamber 30 may be included in a portion of the inner body 12. The second diffuse reflection member 15 may include a plurality of second protrusions 15a protruding toward the inside of the chamber 30. Each second protrusion 15a may include a curved surface. For example, each second protrusion 15a may have a hemispherical shape or an ellipse shape. As another example, each of the second protrusions 15a may have a curved surface, but may be a pattern formed to have a predetermined length along the side surface of the chamber 30.

The plurality of second protrusions 15a may have the same size as each other. At this time, the height or the radius of curvature of the plurality of second protrusions 15a may have a size of several centimeters. When the second protrusion 15a has a hemispherical shape, the radius of curvature of the second protrusion 15a may be the same.

The plurality of second protrusions 15a may be spaced apart from each other at regular intervals. However, the plurality of second protrusions 15a are not necessarily arranged at regular intervals. Although not shown in the drawings, the plurality of second protrusions 15a may be randomly arranged without any rule.

As described above, when the second diffuse reflection member 15 is formed such that the curved surfaces of the plurality of second protrusions 15a face the inside of the chamber 30, the electromagnetic waves irradiated into the chamber 30 are second protrusions 15a. It is diffusely reflected by the curved surface. As a result, electromagnetic waves are evenly absorbed into the material to be heated.

On the other hand, when the curved surface of the second protrusion 15a is formed to face the outside of the chamber 30, it is formed in a specific region (for example, a tip portion where the curved surface of the protrusion and the plane of the inner body 12 are connected). Electrons can be emitted by a strong electric field. However, as shown in FIG. 5A, when the second diffuse reflection member 15 is formed such that the curved surface of the second protrusion 15a faces the inside of the chamber 30, the protrusions 15a having a radius of curvature of a circle or an ellipse may be formed. Since the strength of the electric field to be formed is reduced compared to the strength of the electric field formed on the protrusions sharply formed inside the chamber 30 or the protrusions formed concavely outward of the chamber 30, the gas discharge is performed even at a higher electric field strength. The phenomenon can be prevented from occurring. In addition, since electromagnetic waves are diffusely reflected on the curved surface of the second protrusion 15a, the material may be evenly heated in the chamber 30.

Here, with reference to FIG. 6, the reason why the gas discharge is suppressed when the protrusion is formed convexly into the chamber 30 is compared with the case where the protrusion is concave to the outside of the chamber 30.

When the bending occurs compared to the discharge voltage in the plane, the strength of the electric field increases in the sharp projections. Based on the intensity of the electric field at one point 81 on the plane of FIG. 6, the rounded corners 82, the

angular corner projections

83 and 84, and the pointed projections 85 are arranged so that the radius of curvature is smaller. The intensity of the electric field around the projections or the sharp projections increases, making it easier to discharge. Therefore, if the material is to be uniformly heated using electromagnetic waves in the chamber 30, the electric field should not be strongly formed around the projection. In other words, when using a projection for uniform heating, it is preferable to form a spherical projection 82 having a large radius of curvature, which is convexly formed inside the chamber 30.

Referring again to FIG. 5B, FIG. 5B is an enlarged view illustrating an enlarged area C of the side of the chamber 30 in FIG. 3 and illustrates another example of the side of the chamber 30.

Referring to FIG. 5B, the second diffuse reflection member 16 disposed on the side of the chamber 30 may be included in a portion of the inner body 12. The second diffuse reflection member 16 may include a plurality of

second protrusions

16a and 16b protruding toward the inside of the chamber 30. Each

second protrusion

16a, 16b may include a curved surface.

FIG. 5B illustrates a case in which hemispherical

second protrusions

16a and 16b having different radii are alternately formed on the side surface of the chamber 30. In this case, the

second protrusions

16a and 16b may be spaced apart at regular intervals. Although not shown in the drawings, each of the

second protrusions

16a and 16b may be disposed adjacent to each other without being spaced apart from each other.

FIG. 5C is an enlarged view illustrating an area C of the side of the chamber 30 in FIG. 3 and illustrates another example of the side of the chamber 30.

Referring to FIG. 5C, the second diffuse reflection member 15 disposed on the side of the chamber 30 may be included in a portion of the inner body 12. The second diffuse reflection member 15 may include a plurality of second protrusions 15a protruding toward the inside of the chamber 30. Each second protrusion 15a may include a curved surface.

The discharge preventing member 13 is disposed on the reflective surface side of the second diffuse reflection member 15. The anti-discharge member 13 includes a first surface disposed toward the reflective surface of the second diffuse reflection member 15 and a second surface disposed toward the interior of the chamber 30.

The first surface of the discharge preventing member 13 may be in contact with the reflective surface of the second diffuse reflection member 15. To this end, the first surface of the discharge preventing member 13 preferably has a shape corresponding to the shape of the reflective surface of the second diffuse reflection member 15. In other words, the first surface of the discharge preventing member 13 is preferably filled between the plurality of second protrusions 15a formed on the reflective surface of the second diffuse reflection member 15.

The second surface of the discharge preventing member 13 may be formed flat, as shown in FIG. 5C. However, the second surface of the discharge preventing member 13 does not necessarily have to be flat, and the second surface may have a bend.

The discharge preventing member 13 as described above may be made of, for example, an insulator having an electrical resistance of 10 ⁸ kV cm or more. Examples of the insulator include ceramics, glass, and heat resistant plastics, but are not limited thereto.

In this way, when the non-conductive discharge preventing member 13 is disposed on the reflecting surface side of the second diffuse reflection member 15, the electrons are released into the chamber 30 even if electrons are collected at a specific portion of the second diffuse reflection member 15. Since it can prevent, the spark generate | occur | produces in the chamber 30 can be prevented. In addition, since the electromagnetic wave irradiated into the chamber 30 is diffusely reflected by the protrusions 15a of the second diffuse reflection member 15 through the discharge preventing member 13, the electromagnetic wave may be uniformly absorbed by the material to be heated.

As described above, the microwave oven 100 has been described as an electromagnetic wave heating apparatus according to an embodiment with reference to FIGS. 1 to 5C. According to another embodiment, the electromagnetic heating device may be a microwave melting device.

7 is a cross-sectional view of a microwave dissolving apparatus 200 as a microgenerator according to another embodiment.

The microwave dissolving apparatus 200 of FIG. 7 receives power from a main body 210 having a melting furnace chamber 230, a door 22 opening and closing an open surface of the main body 210, and a power source 290, and a magnetron 270. A power supply (280) for converting the voltage and current suitable for driving the light, the magnetron 270, a microwave generator, and the waveguide 271 for delivering microwaves generated from the magnetron 270 to the furnace chamber 230. And an electromagnetic wave diffuse reflection member 213 installed at one side of the furnace chamber 230.

The main body 210 includes an outer body 211 and an inner body 212. In the case of the microwave oven 100 of FIG. 3, an open surface is formed on the front surface of the main body 10, whereas in the microwave dissolving device 200 of FIG. 7, an open surface may be disposed on an upper surface of the main body 210. have.

In the melting furnace chamber 230 of the microwave dissolving apparatus 200, a substance to be dissolved, for example, a sample or metallic powder (powder), is placed. When the material to be dissolved is the metallic powder 260, the metallic powder 260 needs to be placed in the furnace chamber 230, and then the exposed surface of the metallic powder 260 needs to be smoothed. However, when such a work is performed by hand, the exposed surface of the metallic powder 260 may not be flat. When operating the microwave dissolving apparatus 200 in this state, a gas discharge phenomenon may occur in the metal particles of the uneven portion may cause sparks into the chamber 230.

In order to prevent such a phenomenon, in the chamber 230, a pressing panel 250 for compressing the metallic powder 260 may be further provided on the exposed surface of the metallic powder 260. The crimp panel 250 may be made of an insulator.

When the metallic powder 260 is pressed using the pressing panel 250, the surface of the metallic powder 260 may be flattened, and sparks generated due to the discharge phenomenon may be expanded into the furnace chamber 230. Can be blocked, and the microwave can be injected continuously. That is, when the crimp panel 250 made of an insulator is not installed, due to the discharge phenomenon occurring on the exposed surface of the metallic powder 260, gas discharge occurs in the furnace chamber 230 and the microwaves generated from the magnetron 270 are generated. It will no longer be injected into the furnace chamber 230 and the microwave dissolution device 200 will not be able to operate.

Although embodiments of the present invention have been described with reference to the illustrated drawings as described above, those skilled in the art to which the present invention pertains may realize the present invention in other specific forms without changing its technical spirit or essential features. It will be appreciated that it may be practiced. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not limiting.

Industrial Applicability The present invention is recognized in the field of electronic products.

Claims

A main body in which a chamber is formed;

An electromagnetic wave generator for radiating electromagnetic waves into the chamber;

A first diffuse reflection member provided on an inner surface of the chamber and including a reflective surface on which a plurality of first projections for diffuse reflection of the electromagnetic wave are formed; And

And an anti-discharge member in contact with the reflective surface to be filled between the plurality of first protrusions.
The method of claim 1,

And the discharge preventing member is an insulator.
The method of claim 1,

And a second diffuse reflection member installed on an inner side surface of the chamber and including a reflective surface on which a plurality of second projections for diffuse reflection of the electromagnetic waves are formed.
The method of claim 3,

The discharge preventing member

Electromagnetic wave heating device, which is in contact with a reflective surface formed with the plurality of second projections so as to fill between the plurality of second projections.
The method of claim 1,

And a pressing panel for leveling the surface of the material placed in the chamber and preventing gas discharge.
A diffuse reflection member comprising a reflective surface on which a plurality of protrusions are formed to diffuse the electromagnetic wave; And

Electromagnetic wave heating device comprising a discharge preventing member in contact with the reflective surface to fill the side of the plurality of projections.