KR100409089B1 - Apparatus for uniformly dissipating microwave and heating system using the same - Google Patents

Abstract

A microwave uniform dispersion device uniformly distributes microwaves of a predetermined frequency, and the microwave uniform dispersion device forms a heating chamber of the heating system to uniformly heat and dry the heated object in the heating chamber.

The uniform dispersion device of microwaves is made of a material that reflects microwaves and is formed of a body having a plurality of reflectors formed vertically on the upper surface and horizontally formed, and the width of the reflectors is the wavelength of the microwaves. The depth of the reflector is divided by the power of the natural number for a smallest number of primitive roots as a reference plane based on the height of the reflector's depth multiplied by (the decimal number-1) from the bottom surface. The remaining value is multiplied by the width of the reflector, or the remaining value obtained by dividing the square of the natural number by a decimal number based on the bottom surface is multiplied by the width of the reflector. To form a lower surface and an inner wall surface to uniformly disperse the microwaves and to uniformly heat the heated object.

Description

Apparatus for uniformly dissipating microwave and heating system using the same

The present invention relates to a uniform dispersion device of microwaves and a heating system using the same.

More specifically, by uniformly dispersing microwaves in a heating chamber by forming a heating chamber of a heating system with a uniform dispersion device of microwaves capable of uniformly dispersing microwaves of a predetermined frequency output from the microwave generating means and the uniform dispersion device. The present invention relates to a heating system using a uniform dispersion device of microwaves which forms an electric field and uniformly heats and dries a predetermined heated object embedded in a heating chamber.

In general, a heating system such as a microwave oven for heating a predetermined food using microwaves of a predetermined frequency, or a microwave drying device for drying wood, sludge, garbage, grains and rubber, etc. uses an oscillation means such as a magnetron. The microwave generating means generates microwaves of 2.45 GHz or 915 MHz, and transmits the generated microwaves to the inside of the heating chamber to heat and dry a predetermined heated object put in the heating chamber.

The microwave has a wavelength of a predetermined length. For example, assuming that the microwave frequency is 2.45 kHz, the wavelength of the microwave is as shown in Equation 1 below.

here, Is the wavelength of microwaves, c is the speed of light 3 x 10 ⁸ m / sec, and f is the frequency of microwaves.

Heating systems for heating and drying the heated object by using the microwaves are generally formed on the inner wall surface, the upper surface and the lower surface of the heating chamber in plan.

Therefore, when the microwave output from the microwave generating means is transmitted to the heating chamber, the microwave is reflected after hitting the inner wall surface of the heating chamber and the plane 10 such as the upper and lower surfaces as shown in FIG. It is not uniformly distributed but reflected deflectively.

As the microwaves are deflected deflectively, the microwaves are not uniformly distributed in the heating chamber. Therefore, certain to-be-heated objects embedded in the heating chamber are not heated uniformly, but are heated while generating the maximum heating point and the minimum heating point. That is, the heated object is heated while the maximum heating point and the minimum heating point are alternately formed at intervals of the microwave wavelength, so that the maximum heating point of the heated object is heated too much, and the minimum heating point does not heat, resulting in uneven heating. Done.

In order to solve these problems, the conventional heating system is equipped with a radio wave stirrer such as a dispersion fan in the upper part of the heating chamber, and uniformly disperses the microwaves while rotating the radio wave stirrer or rotates the target object to be heated. The water is heated evenly.

However, using the radio wave stirrer or rotating the heated object requires a separate drive motor for generating rotational power and a power transmission mechanism for transmitting the rotational force of the drive motor. There was a problem such that the production cost of the rise to consume a lot of power.

An object of the present invention is to provide a uniform dispersion device of microwaves capable of uniformly dispersing microwaves of a predetermined frequency.

It is another object of the present invention to provide a heating system using a microwave uniform dispersion device capable of uniformly heating the heated object inside the heating chamber by forming a heating chamber with the microwave uniform dispersion device to uniformly disperse the microwaves. It is.

Microwave uniform dispersion device of the present invention for achieving this object is made of a material that reflects the microwave, the upper surface is formed horizontally and has a body having a plurality of reflecting portions formed vertically on the side. Widths of the plurality of reflecting portions are microwave wavelengths Can be set to 1 / n times where n is 1, 2, 3, ... but more effective wavelengths of microwaves Of 1 / 4n (for example, /4, /8, Set to / 12, ...

The depth of the plural reflectors is the prime power of the natural number for the smallest primitive root, based on the height corresponding to the width of the reflector multiplied by (prime number-1) from the bottom. Set the value obtained by multiplying the remainder divided by the width of the reflector or the value of the remainder obtained by dividing the square of the natural number by a decimal number with the bottom surface as the reference plane and multiplied by the width (W) of the reflector.

In addition, the heating system of the present invention by connecting the above-mentioned body continuously and repeatedly to form the upper surface, the lower surface and the inner wall surface of the heating chamber, and installed on the inner surface of the door, the microwave generated from the microwave generating means and transmitted to the heating chamber is heated. It is uniformly dispersed by the body in the chamber to form a uniform electric field of microwaves, and the predetermined heated object is uniformly heated and dried.

1 is a view for explaining the reflection characteristics when the microwave is incident on the plane,

Figure 2 is a perspective view showing the configuration of the uniform dispersion device of the present invention,

Figure 3 is a side view showing the configuration of the uniform dispersion device of the present invention,

4 is a view for explaining the reflection characteristics when the microwave is incident on the uniform dispersion device of the present invention,

5 is an embodiment showing a heating system in which a heating chamber is formed as a body of the uniform dispersion apparatus of the present invention.

5A is a perspective view of an open door of the heating system,

5b is a sectional view of a heating system,

6a and 6b are views showing other embodiments in which the body of the uniform dispersion device in the heating system of the present invention is arranged,

7 is a view showing an embodiment in which the heating object storage chamber is installed in the heating chamber formed of the body of the uniform dispersion apparatus of the present invention.

7A is a perspective view of an open door of the heating system,

7b is a sectional view of a heating system,

Figure 8 is a temperature contour showing the result of measuring the temperature after the cheese was put into the heating system of the present invention, and heated for 1 minute with a microwave output of 2 kHz.

* Description of the symbols for the main parts of the drawings *

20: body 22: reflector

50: main body of the heating system 51: microwave generating means

52: heated object 53: heating chamber

54: microwave transmission means 55: door

56: see-through window 57: exhaust vent

58, 74 through hole 60: basic body

70: heated object storage room 72: opening and closing plate

221, 221a to 221f: upper surface 223: side surface

Hereinafter, with reference to the accompanying drawings of Figures 2 to 8 will be described in detail the uniform dispersion device of the microwave of the present invention and a heating system using the same.

2 is a perspective view showing the configuration of a uniform dispersion device of microwaves according to the present invention. Here, reference numeral 20 denotes a body of the uniform dispersion device according to the present invention. The body 20 of the uniform dispersion device is made of a material that reflects microwaves. For example, the body 20 may be made of an aluminum thin plate. In addition, the body 20 may be formed of a heat resistant synthetic resin, and may be formed by coating a reflective material such as aluminum to reflect microwaves on the surface of the heat resistant synthetic resin.

The body 20 is formed in the shape of a disperser which has been studied and published by Manfred R. Schroeder of Germany and Murray Hill of ATT Bell Lab., And includes a plurality of reflectors 22.

The plurality of reflectors 22 have upper surfaces 221 horizontally, and side surfaces 223 are vertical.

In addition, the upper surfaces 221 of the plurality of reflecting portions 22 are all formed with the same width (W). For example, the width of the upper surface 221 of the plurality of reflecting portions 22 is the wavelength of microwaves. Can be set to 1 / n times (where n is 1, 2, 3, ...), but the wavelength of the microwave 1/4 n times (for example, /4, /8, It is more effective to form the width W of / 12, ...).

The upper surfaces 221 of the plurality of reflecting portions 22 are formed to have different depths D _K from the bottom surface with a height equal to the value obtained by multiplying the width of the reflecting portion by (decimal-1). .

For example, a plurality of reflections are obtained by multiplying the width (W) of the set reflector by the remaining value obtained by dividing the power of the natural number n with respect to the smallest primitive root g of the prime number p by the following equation (2): The depth D _K of the upper surface 221 of the portion 22 is formed.

D = g ⁿ module p

D _K = D / W

Here, p is a prime number, g is the minimum primitive root of the prime number p, n is a natural number of 1, 2, 3, ..., g ⁿ module p means the remainder divided by g ⁿ by p.

For example, when the prime number p is 7 and the minimum primitive root g of the prime number p is 3, the depths D _K ; D1 to D6 of the upper surfaces 221; 221a to 221f of the plurality of reflecting portions 22 are assumed. The following is based on the reference plane.

3 ¹ = 3; 3/7 = quotient 0, remainder = 3

3 ² = 9; 9/7 = quotient 1, remainder = 2

3 ³ = 27; 27/7 = quotient 3, remainder = 6

3 ⁴ = 81; 81/7 = share 11, remainder = 4

3 ⁵ = 243; 243/7 = share 34, remainder = 5

3 ⁶ = 729; 729/7 = quotient 104, remainder = 1

That is, the upper surfaces 221a to 221f of the plurality of reflecting portions 22 are 6W multiplied by 6, which is the height of the reference plane, that is, the width of the reflecting portion, subtracted by 6, which is the subtracted value of 7, which is the value of the prime number p, as shown in FIG. to the height of the reference surface, each 3W, 2W, 6W, 4W, 5W and depth of 1W; is formed from a (D _K D1~D6).

This is shown in Table 1 below.

n Depth from reference plane p = 5, g = 2 p = 7, g = 3 p = 11, g = 2 p = 13, g = 2 p = 17, g = 3 p = 19, g = 2 One 2 W 3 W 2 W 2 W 3 W 2 W 2 4 W 2 W 4 W 4 W 9 W 4 W 3 3 W 6 W 8 W 8 W 10 W 8 W 4 1 W 4 W 5 W 3 W 13 W 16 W 5 5 W 10 W 6 W 5 W 13 W 6 1 W 9 W 12 W 15 W 7 W 7 7 W 10 W 11 W 14 W 8 3 W 9 W 16 W 9 W 9 6 W 5 W 14 W 18 W 10 1 W 10 W 8 W 17 W 11 7 W 7 W 15 W 12 1 W 4 W 11 W 13 12 W 3 W 14 2 W 6 W 15 6 W 12 W 16 1 W 5 W 17 10 W 18 1 W

When the depths D _K : D1 to D6 of the plurality of upper surfaces 221a to 221f of the reflector 22 based on the reference plane are converted to the height H _K ; H1 to H6 based on the bottom surface, Same as

3 ¹ 6-3 = 3

3 ² 6-2 = 4

3 ³ 6-6 = 0

3 ⁴ 6-4 = 2

3 ⁵ 6-5 = 1

3 ⁶ 6-1 = 5

That is, the heights H _K : H1 to H6 of the top surfaces 221a to 221f are formed of 3W, 4W, 0, 2W, 1W, and 5W, respectively, based on the bottom surface.

In addition, the height H _K of the upper surface 221 of the reflector 22 may be set by other methods besides the above method. For example, the height H _K of the upper surface 221 of the reflector 22 with respect to the bottom surface is the width of the reflector to the remaining value obtained by dividing the square of 0 and the natural number by a fraction p, as shown in Equation 3 below. It can also be set to the product of.

H = N ² module p

H _K = HW

Here, N is 0, 1, 2, ···, p is a prime number, N ² and module p will sense a remainder obtained by dividing the N ² to p.

For example, when the decimal number p is 5, the height H _K of the upper surfaces 221a to 221f of the plurality of reflecting portions 22 is set as follows.

0 ² = 0; 0/5 = 0, remainder = 0

1 ² = 1; 1/5 = 0, remainder = 1

2 ² = 4; 4/5 = 0, remainder = 4

3 ² = 9; 9/5 = 1, remainder = 4

4 ² = 16; 16/5 = 3, remainder = 1

5 ² = 25; 25/5 = 5, remainder = 0

The values H1 to 0, 1W, 4W, 4W, 1W, and 0, which are multiplied by the widths of the reflecting portions, respectively, the remaining values of the upper surfaces 221a to 221f of the plurality of reflecting portions 22 from the bottom surface. H6).

This is shown in Table 2 below.

N p 5 7 11 13 17 19 23 0 0 0 0 0 0 0 0 One 1 W 1 W 1 W 1 W 1 W 1 W 1 W 2 4 W 4 W 4 W 4 W 4 W 4 W 4 W 3 4 W 2 W 9 W 9 W 9 W 9 W 9 W 4 1 W 2 W 5 W 3 W 16 W 16 W 16 W 5 0 4 W 3 W 12 W 8 W 6 W 2 W 6 1 W 3 W 10 W 2 W 17 W 13 W 7 0 5 W 10 W 15 W 11 W 3 W 8 9 W 12 W 13 W 7 W 18 W 9 4 W 3 W 13 W 5 W 12 W 10 1 W 9 W 15 W 5 W 8 W 11 0 4 W 2 W 7 W 6 W 12 1 W 8 W 11 W 6 W 13 0 16 W 17 W 8 W 14 9 W 6 W 12 W 15 4 W 16 W 18 W 16 1 W 9 W 3 W 17 0 4 W 13 W 18 1 W 2 W 19 0 16 W 20 9 W 21 4 W 22 1 W 23 0

As described above, the body 20 of the uniform dispersion device of the present invention has a width W that is proportional to the wavelength of the microwave and a depth D _K or a height H _K different from each other according to Equation 2 or Equation 3 above. It is formed of a plurality of reflectors 22 having a.

The body 20 of the uniform dispersion apparatus of the present invention can be manufactured and used to continuously connect the body 20 shown in FIG. 2 to the body 20 of the uniform dispersion apparatus as shown in FIG. 4. When is incident, the microwave can be uniformly dispersed while reflecting to form a uniform electric field.

Therefore, even if it does not rotate a predetermined to-be-heated object, it heats and dries uniformly by the microwave which disperse | distributes uniformly even if it is stopped.

And when the body 20 is installed on a wall surface such as a heating system, if both ends of the left and right ends of the body 20 is not in close contact with the ceiling surface and the bottom surface, respectively, the microwaves through the open left and right both ends May leak. Therefore, in this case, it is preferable to seal both ends with a plate 24 made of the same material as the body 20 so that microwaves do not leak.

Meanwhile, in the above embodiment, the body 20 of the uniform dispersion apparatus of the present invention has been described as having six reflecting portions 22. In the present invention, the number of the reflecting portions 22 is not limited, and the required number of decimals is selected according to the size of the heating chamber of the heating system in which the body 20 is to be installed, and the plurality of reflecting portions 22 according to the selected minorities are provided. It is possible to do

Of course, even in this case, the width W of the reflector 22 constituting the body 20 is the wavelength of the microwave as in the above-described embodiment. Can be set to 1 / n times with respect to the wavelength of the microwave 1/4 n times (ie /4, /8, / 12, ... to have a width of).

In the case of forming the heating chamber of the heating system with the body 20 of the uniform dispersion apparatus of the present invention, microwaves may be uniformly dispersed to form a uniform electric field inside the heating chamber.

Figure 5 is an embodiment showing a heating system in which a heating chamber is formed by the body of the uniform dispersion device of the present invention, Figure 5a is a perspective view showing the opening of the door of the heating system, Figure 5b is a cross-sectional view of the heating system.

Here, reference numeral 50 denotes a body of the heating system. One side of the main body 50 is provided with a microwave generating means 51 for generating microwaves using an oscillating means such as a magnetron, and the other side of the main body 50 is a microwave generated by the microwave generating means 51 The heating chamber 53 which heats and drys the to-be-heated object 52 of this is provided.

In addition, between the microwave generating means 51 and the heating chamber 53, microwave transmitting means 54 such as a waveguide for transmitting the microwaves generated by the microwave generating means 51 to the heating chamber 53 is provided. .

The upper surface, the lower surface, and the inner circumferential wall of the heating chamber 53 are formed by continuously repeating the body 20 of the uniform dispersion apparatus, and the heating chamber 53 is provided on the front surface of the heating chamber 53 according to a user's operation. The door 55 for opening and closing the door 55 is provided, and the body 20 of the homogeneous dispersion device is continuously formed repeatedly and repeatedly, except for the viewing window 56 on the inner surface of the door 55. At this time, the upper surface 221 of the reflecting portion 22 of the body 20 is installed to face the interior of the heating chamber 53.

In the body 20 of the homogeneous dispersion device forming the upper surface, the lower surface, and the inner circumferential wall of the heating chamber 53, the heating object 52 is microwaved with the door 55 closed to seal the heating chamber 53. A plurality of through holes 58 are formed at predetermined intervals for sucking and discharging water vapor generated when the water is heated and dried.

At this time, since the microwaves should not leak through the through holes 58, it is preferable to set the radius of the through holes 58 to a size in which the microwaves do not leak, for example, a radius of 0.6 to 0.8 mm.

The heating system of the present invention configured as described above first opens the door 55 when heating and drying a predetermined heated object 52, and puts the heated object 52 into the heating chamber 53, and then the door. Close 55 and allow the heating system to operate.

Then, the microwave generating means 51 operates to generate microwaves, and the generated microwaves are transmitted to the heating chamber 53 through the microwave transmitting means 54.

As described above, the microwaves transmitted to the heating chamber 53 form the upper surface, the lower surface and the inner circumferential wall of the heating chamber 53, and the reflecting portion of the body 20 of the uniform dispersion apparatus installed inside the door 55 ( By being uniformly dispersed and reflected by 22, the microwaves in the heating chamber 53 are formed in a uniform electric field, whereby the heated object 52 is uniformly heated and dried.

At this time, steam and smell generated by heating and drying the heated object 52 are sucked through the through holes 58 formed in the body 20 and then discharged to the outside through the exhaust port 57.

6a and 6b are views showing other embodiments in which the body of the uniform dispersion device in the heating system of the present invention is arranged. As shown therein, several bodies 20 having a predetermined length are continuously formed to form a basic body 60 which is substantially square, and the plurality of basic bodies 60 are reflected as shown in FIG. 6A. The sections 22 may be arranged in a zigzag fashion so as to be vertical and horizontal to form the top, bottom, and inner wall surfaces of the heating chamber 53 of the heating system, or may be installed on the door 55.

In addition, the plurality of basic bodies 60 may be arranged in a zigzag such that the reflectors 22 are arranged to be inclined.

Figure 7 is an embodiment showing a state in which the uniform dispersion device of the present invention is installed in the heating system, Figure 7a is a perspective view showing the door of the heating system open, Figure 7b is a cross-sectional view of the heating system.

As shown therein, another embodiment of the present invention includes a heated object storage chamber 70 made of Teflon through which microwaves can pass through inside the body 20 constituting the heating chamber 53. Each surface of the heated object storage chamber 70 may be formed to have a size such that it is in contact with the highest upper surface of the reflecting portion 22 of the body 20.

In addition, the body 20 attached to the door 55 also includes an opening and closing plate 72 made of Teflon through which microwaves can penetrate, and the front of the heated object storage chamber 70 when the door 55 is closed. The opening and closing plate 72 is closed.

The separate heating object storage chamber 70 is provided in the heating chamber 53 in order to facilitate internal cleaning after heating and drying the predetermined heating object 52.

Here, a plurality of through holes 74 are also formed in the heated object storage chamber 70 to discharge steam or odor generated when the heated object 52 is heated and dried to the outside through the exhaust port 57. It is desirable to be able to.

In the heating system of the present invention, a 0.7 cm thick Teflon plate is installed at a height of 3 cm from the inner bottom of the heating chamber 53, and a plurality of cheeses are arranged on the Teflon plate to be in contact with each other. 51) generates a microwave at an output of 2 kHz, and when the generated microwave is transmitted to the heating chamber 53 through the microwave transmission means 54 to heat the cheese, each minute of the cheese is passed. As a result of measuring the temperature of the site, a temperature contour line as shown in FIG. 8 was obtained.

In FIG. 8, the heating system of the present invention distributes the temperature of each portion of the cheese to 26.1-29.9 ° C. It can be seen that the cheese is heated uniformly as the temperature difference between the most heated portion and the least heated portion is 3.8 ° C.

Meanwhile, in the above-described embodiment, the operator directly puts the predetermined heated object 52 into the heating chamber 53 and the heated object storage chamber 70 of the heating system, and heats and dryes the present invention. The present invention is not limited thereto, and may be applied to various microwave heating systems.

For example, the present invention relates to a heating system in which both left and right sides are opened to automatically transfer a predetermined heating target object through a conveyor (not shown), and the microwaves do not leak to the open portion. By installing the body 20 of the microwave can be uniformly dispersed and heated and dried evenly to be heated.

As described in detail above, the present invention has a dispersing property of uniformly propagating microwaves at all reflection angles, and thus it is possible to uniformly heat and dry a predetermined heated object.

Claims (14)

It is formed of a material that reflects microwaves, and has a width equal to the wavelength of the microwaves, all of which have the same width, and each having a different depth from the bottom surface as a reference plane based on the height multiplied by the width of the reflector by (fraction-1). Consists of a body with reflectors, The width W of the plurality of reflectors is a wavelength of microwave Is set to 1 / n (where n is 1, 2, 3, ...) times, Depth (D _K ) of the plurality of reflecting portion is a microwave uniform dispersion device, characterized in that each set according to the following equation (1) on the basis of the reference plane. D = g ⁿ module p, D _K = DW -------------- (1) Here, p is a prime number, g is the smallest primitive root of the prime number p, n is 1, 2, 3, ..., g ⁿ module p means the remaining value divided by g ⁿ by p. The method of claim 1, The top surface of the plurality of reflecting portion is made horizontal, the side of the microwave uniform dispersion device, characterized in that the vertical. The method of claim 1, wherein the width of the plurality of reflectors; Microwave wavelength Microwave uniform dispersion device, characterized in that is set to 1 / 4n times. It is formed of a material that reflects microwaves, and is made of a body having a plurality of reflecting portions having a width of all the same size in proportion to the wavelength of the microwave and having a different height relative to the bottom surface, The width W of the plurality of reflectors is a wavelength of microwave 1 / n times (where n is 1, 2, 3, ...), The height H _K of the plurality of reflectors based on the bottom surface is uniformly distributed in the microwave, characterized in that each set according to Equation 2. H = N ² module p, H _K = HW -------------- (2) Here, N is 0, 1, 2, 3, ···, p is a prime number, and N ² refers to the module p remainder obtained by dividing the N ² to p. The method of claim 4, wherein The top surface of the plurality of reflecting portion is made horizontal, the side of the microwave uniform dispersion device, characterized in that the vertical. The method of claim 4, wherein the width of the plurality of reflectors; Microwave wavelength Microwave uniform dispersion device, characterized in that is set to 1 / 4n times. Microwave generating means for generating microwaves; Microwave transmitting means for transmitting microwaves generated from the microwave generating means; A heating chamber configured to disperse the microwaves transmitted by the microwave transmitting means to heat and dry the heated object; And The door is provided in front of the heating chamber so as to be opened and closed. Top, bottom and inner wall surfaces of the heating chamber; The body of the microwave is formed of a material that reflects microwaves, the body having a plurality of reflecting portions having a different width relative to the reference plane in proportion to the wavelength of the microwave and having a different depth relative to the reference plane Heating system using a uniform dispersion device. The method of claim 7, wherein the body; The width W of the plurality of reflecting portions is a wavelength of microwaves Is set to 1 / n times of The width of reflection portions from the bottom surface (decimal 1) relative to the height of the number multiplied by the microwaves of uniform distribution device characterized in that each set according to the following formula 3 parts of a plurality of reflection depth (D _K) Used heating system. D = g ⁿ module p, D _K = DW -------------- (3) Here, p is a prime number, g is the smallest primitive root of the prime number p, n is 1, 2, 3, ..., g ⁿ module p means the remaining value divided by g ⁿ by p. The method of claim 7, wherein the body; The width W of the plurality of reflecting portions is a wavelength of microwaves Is set to 1 / n times of And a height H _K of the plurality of reflectors is set based on Equation 4 based on the bottom surface, respectively. H = N ² module p, H _K = HW -------------- (4) Here, N is 0, 1, 2, 3,..., P is a prime number, and N ² module p means the remaining values obtained by dividing N ² by p. The method of claim 7, wherein the body; Heating system using a uniform dispersion device of microwaves, characterized in that arranged in a zigzag arrangement. The method of claim 7, wherein the body; Heating system using a uniform dispersion device of the microwave, characterized in that arranged in a zigzag state in which the reflecting portion is inclined. The method of claim 7, wherein the body comprises: a body; A heating system using a uniform dispersion device of microwaves, characterized in that the through-holes are provided at predetermined intervals to discharge the steam and odor generated by heating and drying the heated object without leakage of the microwaves. 12. The apparatus according to any one of claims 7 to 11, further comprising: an inner side of a heating chamber made of the body; A heating system using a uniform dispersion device of microwaves, characterized in that it comprises a heated object storage chamber made of a material that can transmit microwaves. The method of claim 7, wherein the inside of the door; It is formed of a material that reflects microwaves, the uniform dispersion device of microwaves, characterized in that the body is composed of a plurality of reflectors having a different width relative to the reference plane in proportion to the wavelength of the microwaves Used heating system.