KR100202628B1 - Leakage interception apparatus of microwave for microwave oven - Google Patents

Abstract

The present invention relates to an electromagnetic leakage blocking device of a microwave oven, and the present invention relates to a space between a door (4) and a main body (1) in which electromagnetic waves emitted into the cavity (2) close the cavity (2) for cooking food. Inductor section 11b and capacitor section 11c are formed in parallel in the high frequency circuit so as to have capacitance and inductance in the gap between door 4 and main body 1 in order to prevent leakage into the gap and harm the human body. By installing electromagnetic chokes in series, the user can minimize the leakage of electromagnetic waves and increase the safety of the user. The range of electromagnetic frequencies that can be cut off can be greatly expanded, so that the design can be expanded and the design can be made even when the oscillation frequency is changed. Do. In addition, to reduce the cost by simplifying the structure by forming a single steel plate structure.

Description

Microwave Leakage Blocker

The present invention relates to an electromagnetic leakage blocking device of a microwave oven, in particular, to improve the blocking ability to block the leakage of electromagnetic waves radiated between the cavity (CAVITY) between the cavity and the door for cooking food and to simplify the structure It relates to an electromagnetic leakage blocking device of a microwave oven.

In general, as shown in FIG. 1, microwaves radiate electromagnetic waves so that food is placed on one side of the main body 1 to cook and the food placed on the cavity 2 is cooked. It comprises a machine room 3 and a door 4 coupled to one side of the main body 1 to open and close the cooking chamber 2. When the microwave oven puts food to be cooked in the cooking chamber 2 and operates, microwaves are radiated from the machine room 3 to the cooking chamber 2 to cook the food.

On the other hand, the microwave oven as described above should not be leaked to the outside because the electromagnetic waves emitted to cook the food is harmful to the human body, but the gap between the door 4 and the main body 1 due to the structure of the microwave oven. As a result, electromagnetic waves leak into this gap.

An example of the conventional electromagnetic wave leakage blocking structure for preventing the electromagnetic wave radiated inside the cavity 2 from leaking to the outside is an outer glass 5 constituting the door 4 of the microwave oven, as shown in FIG. 2. The electromagnetic wave leakage preventing plate (7) bent at the end is coupled between the inner glass (6) and a multi-stage bending plate (8) is coupled to the electromagnetic wave leakage preventing plate (7) and the choke seal (CHOKE SEAL) ) Is formed, and the choke cover 9 is coupled between the end of the electromagnetic leakage preventing plate 7 and the end of the plate 8.

The structure of the main body 1 and the door 4 when electromagnetic waves are emitted inside the cavity 2 while the door 4 is closed on the front of the main body 1 having the cavity 2 formed therein. Electromagnetic waves leaking in between are prevented by the electromagnetic leakage preventing plate 7 and the printing plate 8.

However, the structure as described above has the disadvantage that the size of the choke portion of the door 4 is large and has a very sensitive characteristic according to the change in the plan and size of the surface in contact with the choke, as well as the assembly of a number of parts There is a disadvantage in that assembly is complicated.

Accordingly, an object of the present invention is to provide a microwave leakage blocking device for simplifying the structure and improving the blocking ability to block the electromagnetic radiation emitted to the cavity to leak between the cavity and the door for cooking food. have.

1 is a perspective view showing the appearance of a typical microwave oven.

Figure 2 is a cross-sectional view showing the electromagnetic wave leakage blocking structure of a conventional microwave oven.

Figure 3 is a perspective view of the microwave electromagnetic leakage blocking device of the present invention.

Figures 4a, 4b, 4c is a perspective view showing a modification of the inductor portion of the microwave electromagnetic leakage blocking device of the present invention.

5A, 5B, and 5C are perspective views showing a modification of the capacitor portion of the microwave electromagnetic leakage blocking device of the present invention.

6A, 6B, and 6C are front cross-sectional views showing modifications of the stud portion and the ridge portion of the microwave electromagnetic leakage shielding device of the present invention;

Figure 7a is a schematic diagram of a microwave oven showing a state of installation of the microwave electromagnetic leakage blocking device of the present invention.

FIG. 7B is an enlarged partial view of FIG. 7A; FIG.

FIG. 8 is a circuit diagram showing an equivalent state of an inductor portion and a capacitor portion of the microwave electromagnetic leakage shielding device of the present invention. FIG.

9 is a circuit diagram showing an equivalent state to the microwave electromagnetic leakage blocking device of the present invention.

10A and 10B are electromagnetic leakage leakage characteristic curves showing leakage states according to incident angles of electromagnetic waves.

Explanation of symbols for main parts of the drawings

One ; Main body 2; Cavity

4 ; Door 10; Perspective Outer Plate

11; Internal steel plate 11a; First contact part

11b; Inductor section 11c; Capacitor part

11d; Stud part 11e; Ridge Department

12; Choke Cover

In order to achieve the object of the present invention as described above, the main body is provided with a cavity in which the food is cooked by electromagnetic radiation radiated therein, and a transparent outer plate and an inner iron plate coupled thereto. In a microwave oven including a door coupled to open and close the cavity, a first contact portion is formed by bending an end portion of the inner steel plate, and a plurality of inductor portions having mutual inductance (INDUCTANCE) are extended after the first contact portion. A microwave oven is formed by bending and extending at the end of each inductor portion to form a capacitor forming a capacitor (CAPACITOR) and the front of the main body, and comprises a choke cover (CHOKE COVER) coupled to the capacitor portion The electromagnetic leakage blocking device of the present invention is provided.

Between the first contact portion and the inductor portion is formed a stub (STUB) is formed a predetermined space, followed by the stud portion is formed a bent ridge (RIDGE) for adjusting the length of the stud portion An electromagnetic leakage blocking device is provided.

The microwave leakage blocking device of the microwave oven is characterized in that the inductor is formed in a square shape.

The inductor unit is provided with a microwave leakage blocking device, characterized in that formed once bent in a square shape.

The capacitor portion is provided with a microwave leakage blocking device of the microwave oven, characterized in that formed in a square shape.

The capacitor unit is provided with a microwave leakage blocking device of the microwave oven, characterized in that formed in a circular shape.

The capacitor portion is provided with a microwave leakage blocking device of the microwave oven, characterized in that formed in a ring shape.

The stud portion is formed of a square mountain and the ridge portion is provided with a microwave leakage blocking device, characterized in that formed in a valley forming a square.

The stud portion is formed of a triangular acid and the ridge portion is provided with a microwave leakage blocking device, characterized in that formed in a valley forming a square.

Hereinafter, the microwave electromagnetic leakage blocking device of the present invention will be described according to the embodiment shown in the accompanying drawings.

As shown in FIG. 3, the microwave electromagnetic leakage blocking device of the present invention includes a main body 1 having a cavity 2 in which food is cooked by electromagnetic waves radiated therein, and a perspective outer plate 10. In the microwave oven comprising a door (4) coupled to the front of the main body (1) to open and close the cavity (2) having an inner iron plate (11) coupled thereto, the inner iron plate (11) A first contact portion 11a is formed by bending an end portion of the inductor, and a plurality of inductor portions 11b having mutual inductances are formed after the first contact portion 11a. The end portions of the inductor portions 11b are formed. A capacitor portion 11c extending and bent to form a capacitor with a front surface of the main body 1 is formed, and has a choke cover 12 coupled to the capacitor portion 11c.

The inductor portion 11b and the capacitor portion 11c form a memory shape, and the end portion of the capacitor portion 11c and the end portion of the first contact portion 11a form a predetermined interval, and the inductor portion 11b and the capacitor A choke seal is formed in the inner space formed by the portion 11c and the first contact portion 11a.

A stud portion 11d is bent between the first contact portion 11a and the inductor portion 11b to form a predetermined space, and the length of the stud portion 11d is adjusted after the stud portion 11d. The bent ridge portion 11e is formed. A flat portion 11f having a predetermined area and length is formed after the ridge portion 11e, and an inductor portion 11b is formed after the flat portion 11f. In addition, the inductor part 11b is preferably formed to be bent at 90 ° to the flat part 11f, and the inductor part 11b is formed in plural at regular intervals. The capacitor part 11c is preferably formed to be bent at 90 ° to the inductor part 11b. The door exterior cover 13 is coupled to the outside so as to surround the flat part 11f and the inductor part 11b so as to be connected to the see-through outer plate 10.

The inductor part 11b is preferably formed in a rectangular shape having a predetermined width and height.

In addition, the capacitor portion 11c is preferably formed in a rectangular shape having a predetermined area.

The stud portion 11d is formed of a square mountain and the ridge portion 11e is formed of a valley forming a square.

Reference numeral 14 denotes a perspective view through which the inside of the cavity 2 can be seen.

Meanwhile, as another modified example of the inductor part 11b, as illustrated in FIGS. 4A, 4B, and 4C, the rectangular shape may be bent once.

As another modified example of the capacitor part 11c, as shown in FIGS. 5A, 5B, and 5C, the capacitor part 11c may be formed in a circle, a ring shape, and a triangle.

As a modification of the stud portion 11d and the ridge portion 11e, as shown in FIGS. 6A, 6B, and 6C, the stud portion 11d is formed of a triangular mountain and the ridge portion 11e is It is preferable that it is formed by the valley which forms a square.

Hereinafter, the operational effects of the microwave electromagnetic wave leakage blocking device of the present invention will be described.

As shown in FIGS. 7A and 7B, the microwave electromagnetic leakage blocking device of the present invention is located at an inner edge of the door 4, and when the door 4 is closed, the front of the cavity 2, that is, the main body 1. ) Is in front of.

In the present invention, the inductor portion 11b is connected in series with the flat portion 11f and the capacitor portion 11c and is formed to have a predetermined inductance value. In addition, the gap between the capacitor portion 11c and the front surface of the main body 1 in contact with the surface and the contact area, the type of material, and the choke cover positioned between the capacitor portion 11c and the front surface of the main body 1 Due to the dielectric constant of 12), the capacitance value is obtained. If such a structure is constituted by an equivalent circuit using a radio wave transmission path, as shown in Fig. 8, the inductance L and the capacitance C are connected in series to the transmission path through which radio waves proceed.

On the other hand, by adjusting the stud portion 11d and the ridge portion 11e, the length of the short stud portion 11d of the electromagnetic circuit is adjusted.

Therefore, when the present invention is constituted by an equivalent circuit, as shown in FIG. 9, an inductance and a capacitance are connected in series to a transmission path through which radio waves are propagated, and a shorter portion 11d connected in series with the transmission path is also shown. It becomes the structure which has.

Therefore, when electromagnetic waves having a predetermined frequency radiated in the cavity 2 leak through the gap between the door 4 and the front surface of the main body 1, they are first blocked by the first contact portion 11a and the ridge portion 11e. By adjusting the length of the stud portion 11d and adjusting the inductance value and the capacitance value to be synchronized with the frequency of the electromagnetic wave, the electromagnetic wave leaked by adjusting the inductor portion 11b, the capacitor portion 11c, etc. is filtered. By doing so, the leakage of electromagnetic waves in the gap between the door 4 and the main body 1 is prevented.

In setting the length of the stud portion 11d,

Stud impedance (IMPEDANCE),

이다.

to be.

In the above formula, Z _L is short, so Z _L = 0,

이 된다. (

: 유효(effective) 전송선 길이)

Becomes (

: Effective transmission line length)

(n = 1, 2, 3,...... ) 인 경우에 스터부 임피던스(

)는

가 된다. (

= 고정)From here

If (n = 1, 2, 3, ...), the stub impedance (

)

Becomes (

= Fixed)

이므로,

가 되도록 스터부(11d)의 길이(l)을 결정하면

로 결정된다.

Because of,

If the length l of the stud portion 11d is determined so that

Is determined.

이므로,In addition, since the inductor part 11b and the capacitor part 11c have an LC circuit connected in series,

Because of,

인 경우에 Z_LC= 0 이 된다. (

)

When Z _LC = 0. (

)

과

를 조절 할 수 있어, 도 10b에 도시한 바와 같이, 차단하는 주파수영역을 보다 넓게 할 수 있게 된다. 뿐만 아니라

과

의 조절로서 누설량을 최대로 억제할 수 있는 설계가 가능하게 된다.On the other hand, the frequency cut off by adjusting LC and l

and

As can be adjusted, as shown in Figure 10b, it is possible to widen the frequency region to cut off. As well as

and

By adjusting the design, it is possible to design that can minimize the amount of leakage.

As described above, the microwave leakage blocking device of the microwave oven according to the present invention prevents electromagnetic waves emitted inside the cavity from being leaked into the gap between the door closing the cavity and the main body to harm the human body. In order to have the value of capacitance and inductance in the gap between the door and the main body, the inductor and the capacitor are formed in parallel in the high frequency circuit, and the electromagnetic choke is installed in series to minimize the leakage of the electromagnetic wave to increase the user's safety as well. The range of possible electromagnetic frequencies can be enlarged, allowing the design to be wider and to be designed even when the oscillation frequency is changed. Cost is reduced by the simplification of the structure by forming a single steel plate structure.

Claims (9)

It comprises a main body having a cavity for cooking food is cooked by the electromagnetic radiation radiated therein, and a door for opening and closing the cavity coupled to the front of the main body made of a perspective outer plate and an inner iron plate coupled thereto In the microwave oven, a first contact portion is formed by bending an end portion of the inner steel plate, and a plurality of inductor portions having mutual inductance are formed after the first contact portion, and are bent and extended at the end portions of the inductor portions. Capacitor portion constituting the front and the capacitor is formed, the electromagnetic wave leakage blocking device of the microwave oven, characterized in that it comprises a choke cover coupled to the capacitor portion. The microwave oven according to claim 1, wherein a stud portion is bent between the first contact portion and the inductor portion to form a predetermined space, and a bent ridge portion is formed after the stur portion to adjust the length of the stud portion. Electromagnetic Leakage Blocker. The microwave leakage blocking device of claim 1, wherein the inductor is formed in a quadrangular shape. The microwave leakage blocking device of claim 1, wherein the inductor is bent once in a square shape. The microwave leakage blocking device of claim 1, wherein the capacitor part is formed in a quadrangular shape. The microwave leakage blocking device of claim 1, wherein the capacitor part is formed in a circular shape. The microwave leakage blocking device of claim 1, wherein the capacitor part is formed in a ring shape. The microwave leakage blocking device of claim 2, wherein the stud portion is formed of a square mountain and the ridge portion is formed of a valley forming a square. The microwave leakage blocking device of claim 2, wherein the stud portion is formed of a triangular mountain and the ridge portion is formed of a valley forming a square.

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