KR101266102B1 - Microwave oven - Google Patents

Abstract

The present invention relates to a microwave oven in which uniform heating performance by microwaves can be improved, and includes a cooking chamber formed on one surface of a radiating part that radiates microwaves inwardly, and is rotatably disposed on the radiating part and formed inside of the cooking chamber. And a stirrer that is inclinedly coupled to the end of the stirrer at an angle not parallel to one surface of the cooking chamber to change the field strength and mode of the microwave radiated from the radiator.

Microwave, uniform heating, microwave, cooking chamber, wave guide, stirrer rod, stirrer

Description

Microwave oven {Microwave oven}

1 is a cross-sectional view showing the configuration of a microwave oven according to an embodiment of the present invention;

FIG. 2 is an enlarged cross-sectional view of 'A' shown in FIG. 1;

3 is a view showing a microwave field of the microwave oven shown in FIG.

4 is a view showing a microwave field when the stirrer is arranged horizontally in the microwave oven shown in FIG.

5 is a graph showing the uniformity of the microwave field according to the phase angle of the stirrer in the microwave oven shown in FIG.

6 is a cross-sectional view showing the configuration of a microwave oven according to another embodiment of the present invention;

7 is a cross-sectional view of the microwave oven to which another kind of shielding member is applied in FIG. 6;

BRIEF DESCRIPTION OF THE DRAWINGS Fig.

1, 100, 110: microwave 2: casing

3: cooking chamber 4: microwave supply unit

5: stirrer 6: stirrer

7: tray 8: radiator

9: radiation hall 10: magnetron

11: wave guide 20: main body

21: joint projection 23: joint surface

102, 112: shield member 104: cooking space

106: radiation space

The present invention relates to a microwave oven, and more particularly, to a microwave oven in which uniform heating performance by microwaves can be improved.

In general, a microwave oven is a device that irradiates microwaves to a non-conductor such as food (hereinafter, referred to as “cooking material”) and heats the core of the food within a short time by molecular vibration in the food.

As described above, in a microwave oven, food is accommodated in the cooking chamber, microwaves generated by the microwave supply unit are radiated into the cooking chamber, and the food is heated.

However, in the microwave oven according to the related art, since microwaves are radiated from one side of the cooking chamber to the inside, there is a problem in that the microwave field inside the cooking chamber is unevenly formed. That is, since the microwave is radiated from the deflected position of the cooking chamber, the microwave is not evenly radiated inside the cooking chamber, and the food is unevenly heated.

In addition, the microwave oven according to the prior art, the performance development is made by focusing on the intermediate point where both light and heavy loads are satisfied when cooking the food. However, the performance of the microwave oven is greatly changed even if the size and shape of the cooking chamber is slightly changed. Therefore, the microwave oven has a design change depending on the size and shape of the cooking chamber, there is a problem that the design change of the microwave oven is very difficult and complicated.

It is an object of the present invention to provide a microwave oven with improved uniform heating performance by microwaves.

Another object of the present invention is to provide a microwave oven in which designing ability is improved by adding a tuning factor for changing a microwave field.

The present invention is a cooking chamber formed on one surface of the radiating part that radiates microwaves, a stirrer rod rotatably disposed in the radiating part and protruding an end portion into the cooking chamber, and the field strength of the microwave radiated from the radiating part. And to provide a microwave oven including a stirrer is inclined at an angle not parallel to one surface of the cooking chamber at the end of the stirrer rod to change the mode.

The stirrer is arranged to be in contact with the cooking chamber. The stirrer rod may be disposed in a normal direction on one surface of the cooking chamber, and a joining surface to which the stirrer is joined may be formed at an end portion thereof. The bonding surface may be formed to be inclined at an angle not parallel to one surface of the cooking chamber so that the upper surface of the stirrer may be closely attached. The phase angle between one surface of the cooking chamber and the stirrer may be formed at an angle between 20 degrees and 30 degrees.

The cooking chamber may include a shield member covering the radiating part, the stirrer, and the stirrer rod. The shield member includes a non-conductor. An end of the stirrer rod may be connected to a position eccentrically to one side from the center of the stirrer.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a cross-sectional view showing the configuration of a microwave oven according to an embodiment of the present invention, Figure 2 is an enlarged cross-sectional view 'A' shown in Figure 1, Figure 3 is the microwave oven shown in Figure 1 4 is a view showing a microwave field of Fig. 4 is a view showing a microwave field when the stirrer is arranged horizontally in the microwave oven shown in Fig. 1, Figure 5 is a stirrer in the microwave oven shown in Fig. It is a graph showing the uniformity of the microwave field according to the phase angle of.

Referring to FIGS. 1 and 2, the microwave oven 1 includes a casing 2 having an open front face and a cooking chamber 3 having an entrance to the inside of the casing 2 and to which food is allowed to enter and exit at the front face. ) And a microwave supply unit 4 connected to an upper surface of the cooking chamber 3 to supply microwaves to the cooking chamber 3, and an upper surface of the cooking chamber 3 to which the microwave supply unit 4 is connected. Field strength and mode of the stirrer rod (5) rotatably disposed and the end of which protrudes inwardly of the cooking chamber (3) and the microwave radiated from the microwave supply unit (4) into the cooking chamber (3). A stirrer 6 is inclinedly coupled to the end of the stirrer rod 5 so as to change.

The casing 2 is formed in a box shape with an open front surface, and the cooking chamber 3, the microwave supply unit 4, the stirrer rod 5, the stirrer 6, and the like are disposed therein. The front side of the casing 2 is rotatably connected to a door (not shown) for opening and closing the door. A control panel (not shown) is disposed at the other front side of the casing 2. The control panel includes a display unit for displaying the operating state of the microwave oven 1 to the outside, and an operation unit for selecting a cooking mode or adjusting an operation of the microwave oven 1.

The cooking chamber 3 is a box-shaped member formed of a conductor material to have a cavity in which the food is accommodated. The tray 7 on which the food is placed is rotatably disposed on the inner bottom of the cooking chamber 3. In addition, the upper surface of the cooking chamber 3 is formed with a radiating part 8 for radiating the microwaves of the microwave supply unit 4 into the cooking chamber 3. The radiation unit 8 includes a plurality of radiation holes 9 formed on the upper surface of the cooking chamber 3 to which the microwave supply unit 4 is connected. The radiation hole 9 is formed with a width L of 1/4 or more with respect to the wavelength of the microwave. This is because if the width L of the radiation hole 9 is smaller than 1/4 of the microwave wavelength, the microwave cannot pass through the radiation hole 9.

The microwave supply unit 4 is disposed between the cooking chamber (3) and the casing (2), the magnetron (10) for generating the microwave, the magnetron (10) and cooking chamber (3) It is formed in communication between the upper surface of the wave guide 11 to guide the microwave toward the radiation portion (8).

The magnetron 10 is disposed in the electric chamber 12 formed between the cooking chamber 3 and the casing 2, and receives the high voltage power from the high voltage transformer 13 installed in the electric chamber 12. Generate a wave. In addition, a cooling fan 14 for cooling the magnetron 10 and the high-pressure transformer 13 is installed in the electric compartment 12. The wave guide 11 is a moving passage for guiding the microwave generated by the magnetron 10 to the upper surface of the cooking chamber 3.

The stirrer rod 5 is rotatably disposed on the radiating part 8 such that an upper portion and a lower portion are respectively located inside the wave guide 11 and the cooking chamber 3. The stirrer rod 5 is disposed perpendicular to the top surface of the cooking chamber 3 in the normal direction.

In addition, an upper portion of the stirrer rod 5 is connected to the driving mechanism 15 disposed above the wave guide 11 and rotated at a constant speed by the driving mechanism 15. The drive mechanism 15 includes a motor 15 having an upper portion of the stirrer rod 5 connected to the rotation shaft 16. The lower portion of the stirrer rod 5 is disposed inside the cooking chamber 3 and is coupled to the stirrer 6.

Referring to FIG. 2, the stirrer rod 5 penetrates vertically through the radiator 8 and is vertically connected to an upper portion of the rotating shaft 16 of the motor 15. A main body 20 having a lower portion disposed in the lower portion, a protruding portion vertically protruding downward from the lower portion of the main body 20 to join the stirrer 6, and the main body 20 to be rotatable. And a support bracket 22 mounted to the radiator 8 to support it.

An upper portion of the main body 20 is disposed in the wave guide 11 and connected to the rotation shaft 16 of the motor 15 penetrating the upper surface of the wave guide 11. The lower part of the main body 20 is rotatably supported by the support bracket 22 so that the main body 20 does not fall downward. The radiating part 8 is formed with a through hole 8a through which the main body 20 is rotatably penetrated.

The joining protrusion 21 protrudes stepwise with a smaller diameter from the lower side of the main body 20 to the lower side. The lower surface of the joining protrusion 21 is formed with a joining surface 23 is coupled to the upper surface of the stirrer 6 is in close contact. The bonding surface 23 is formed to be inclined with respect to the upper surface of the cooking chamber 3 at a predetermined phase angle θ. The phase angle θ is formed within a range in which the stirrer 6 is not in contact with the inner surface of the cooking chamber 3.

The stirrer 6 is a fan-shaped member which is joined to the joining surface 23 and rotated together with the stirrer rod 5. The stirrer 6 comprises a conductor. The joint surface 23 of the stirrer 6 and the joining protrusion 21 is configured to be bonded very cleanly. Therefore, the stirrer 6 is disposed not to be parallel to the upper surface of the cooking chamber 3 by the phase angle θ of the bonding surface 23.

In addition, the stirrer 6 is disposed to correspond to the radiation hole 9 at the lower side of the radiation portion 8. The stirrer 6 may be eccentrically connected to a portion other than the center at the end of the stirrer rod 5. Therefore, when the stirrer 6 is rotated below the radiation hole 9 by the motor 15, the stirrer 6 shakes the microwave radiated through the radiation hole 9 to the cooking chamber ( Microwaves are uniformly delivered into the interior of 3).

As described above, since the stirrer 6 is inclined at a predetermined phase angle θ and the end of the stirrer rod 5 is connected to a position eccentrically from the center of the stirrer 6, the cooking chamber ( Inside the 3) a new mode of the microwave field is created, the microwave acts on the food in a multi-mode.

Looking at the operation and effect of the microwave oven 1 according to an embodiment of the present invention configured as described above are as follows.

First, the door of the microwave oven 1 is opened, and the food to be cooked is placed on the tray 7 of the cooking chamber 3, and the door is closed to seal the cooking chamber 3. Then, the cooking mode of the food is set through the control panel, and the microwave oven 1 is operated.

The power is input to the high voltage transformer 13 of the microwave oven 1 and the voltage is increased to high pressure, and the microwave is generated by the magnetron 10 that receives the high voltage power. The microwave is moved to the upper surface of the cooking chamber along the wave guide 11, the radiation hole (9) of the radiating portion (8) formed on the connection surface of the upper surface of the cooking chamber 3 and the wave guide 11 It is radiated into the inside of the cooking chamber (3).

In addition, the stirrer rod 5 is rotated by the motor 15 so that the stirrer 6 is rotated at a constant speed. Therefore, since the microwave is stirred by the stirrer 6, the microwave is more uniformly spread inside the cooking chamber 3, thereby improving the uniform heating performance of the food.

3 is an experimental value showing a microwave field inside the cooking chamber 3 measured while the stirrer 6 is inclinedly bonded to the stirrer rod 5 at a predetermined phase angle θ, and FIG. It is an experiment which shows the microwave field in the cooking chamber 3 measured in the state which the lorler 6 was bonded to the stirrer rod 5 horizontally. Comparing the microwave field shown in FIG. 3 with FIG. 4, the microwave field shown in FIG. 3 is more uniform and wider than the microwave field of FIG. 4. Accordingly, the uniform heating performance of the food is improved, and the cooking quality of the food is also improved.

Because the stirrer 6 shown in FIG. 3 is disposed to be inclined at a predetermined phase angle θ, and the distance from the radiation hole 9 is different depending on the position, Microwaves are asymmetrically shaken to spread evenly inside the cooking chamber (3). That is, the microwave field is formed in the cooking chamber 3 in a new multi-mode as the phase angle θ of the stirrer 6 changes.

In addition, when the stirrer 6 is joined to a position eccentrically to one end of the stirrer rod 5 instead of the center, the asymmetry of the stirrer 6 is further increased, so that the interior of the cooking chamber 3 is increased. The microwave field is radiated more evenly.

When the cooking of the food is completed as described above, a signal indicating that cooking is completed is displayed through the display unit of the control panel. At this time, the door is opened to remove the cooked food from the inside of the cooking chamber 3, and the inside of the cooking chamber 3 is cleaned.

On the other hand, when designing the microwave oven 1, the microwave field is reset according to the size, shape, etc. of the cooking chamber 3. That is, the microwave oven 1 is a microwave field is designed at the point that satisfies the cooking performance for all loads of the food, if the size and shape of the cooking chamber 3 changes, the microwave field is also adjusted again Done. In this case, when the phase angle θ of the stirrer 6 is changed, the microwave field is changed while the separation distance between the stirrer 6 and the radiation hole 9 is changed. The optimization of the field is made simple compared with the prior art. Therefore, when designing the microwave oven 1, one more tuning factor of the phase angle θ of the stirrer 6 is added, thereby improving design freedom of the microwave oven 1.

Referring to FIG. 5, the uniformity of the microwave field of the cooking chamber 3 is the maximum between 20 degrees and 30 degrees of the phase angle θ of the stirrer 6. That is, as the phase angle θ of the stirrer 6 is increased from 0 degrees to 25 degrees, the uniformity of the microwave field is also increased. On the other hand, as the phase angle θ of the stirrer 6 is increased to 25 degrees or more, the uniformity of the microwave field decreases on the contrary. Thus, the microwave oven 1 tunes the phase angle θ of the stirrer 6 between 20 and 30 degrees in design.

6 is a cross-sectional view showing the configuration of a microwave oven according to another embodiment of the present invention, Figure 7 is a cross-sectional view of a microwave oven to which a different kind of shielding member is applied in FIG. In FIG. 6 and FIG. 7, the same reference numerals are given to the same or similar components as in the exemplary embodiment of the present invention. Hereinafter will be described based on the differences from the embodiment of the present invention described above.

The microwave oven 100, 110 shown in FIG. 6 or 7 differs from the microwave oven 1 shown in FIG. 1 in that the cooking chamber 3 includes a stirrer rod 5, a stirrer 6, and a room. It includes a shielding member (102) 112 that covers the dead part (8). In addition, the shielding members 102 and 112 include a non-conductor so that the microwaves pass smoothly into the cooking chamber 3. Mica sheet is typical of the non-conductor.

Referring to FIG. 6, a stirrer rod 5, a stirrer 6, and a radiator 8 are provided at an upper portion of the cooking chamber 3, and are spaced a predetermined distance downward from the stirrer 6. The shielding member 102 is formed horizontally. The shielding member 102 divides the internal space of the cooking chamber 3 into a cooking space 104 and a spinning space 106. The cooking space 104 is a tray 7 is arranged in a space formed below the shielding member 102, the radiation space 106 is a space formed on the upper side of the shielding member 102 stirrer (6) ) And the radiator 8 are arranged.

Referring to FIG. 7, a stirrer rod 5, a stirrer 6, and a radiator 8 are provided at an upper portion of the cooking chamber 3, wherein the stirrer rod 5, the stirrer 6, and a room are provided. A shielding member 112 formed in a structure surrounding the four ends 8 is detachably attached to an inner surface of the cooking chamber 3. Like the shielding member 102 of FIG. 6, the shielding member 112 divides the inner space of the cooking chamber 3 into the cooking space 104 and the radiation space 106. However, the shielding member 112 is a magnet 114 is formed along the circumference is detachably mounted on the inner upper surface of the cooking chamber (3). Accordingly, the shielding member 112 is replaced and cleaned of the shielding member 112 very easily compared to the shielding member 102 of FIG. 6.

As described above, in the microwave oven 100 and 110, the stirrer rod 5, the stirrer 6, and the radiator 8 are not exposed to the outside by the shielding members 102 and 112. Therefore, the aesthetics of the cooking chamber 3 is improved, and foreign matter does not adhere to the stirrer rod 5, the stirrer 6, and the radiator 8 during the cooking operation of the microwave oven 10. Is improved.

As described above, the microwave oven according to the present invention has been described with reference to the illustrated drawings. However, the present invention is not limited to the above-described embodiments and drawings, and various modifications are possible by those skilled in the art within the technical scope of the present invention. Of course.

That is, the present invention can be applied not only to a microwave oven, but also to any cooking apparatus using microwaves such as a microwave oven and an oven. In addition, the shield member of the present invention may be formed in a canopy (Canopy) structure.

In the microwave oven of the present invention, since the stirrer is inclined at a predetermined phase angle with respect to the radiating part of the cooking chamber, the uniformity of the microwave field is increased due to the asymmetry between the stirrer and the radiating part and thus the uniformity by the microwave There is an advantage that the heating performance is improved.

In addition, the microwave field inside the cooking chamber is changed according to the phase angle of the stirrer and the connection position of the stirrer and the stirrer rod. In addition, there is an advantage that the design of the microwave oven is improved.

Claims (9)

A cooking chamber formed on one surface of a radiating part that radiates microwaves; A stirrer rod rotatably disposed at the radiating portion and protruding an end portion into the cooking chamber; A stirrer coupled obliquely at an angle not parallel to one surface of the cooking chamber at an end of the stirrer rod to change a field strength and a mode of the microwave radiated from the radiator, The stirrer rod, A main body vertically penetrating the radiating part and connected to an upper part of a rotating shaft of the motor, and having a lower part disposed inside the cooking chamber; A joining protrusion which protrudes vertically from the lower portion of the main body to the lower side and to which the stirrer is joined; And a support bracket mounted to the radiator to rotatably support the main body. The method according to claim 1, The stirrer is disposed in a non-contact microwave oven. The method according to claim 1, The stirrer rod is disposed in the normal direction on one surface of the cooking chamber, The joining projection is a microwave oven in which a joining surface to which the stirrer is joined is formed at the end. The method of claim 3, The bonding surface, the microwave oven is formed to be inclined at an angle not parallel to one surface of the cooking chamber is coupled to the upper surface of the stirrer in close contact. The method according to claim 1, The cooking chamber includes a shield member covering the radiating portion, the stirrer and the stirrer rod. The method of claim 5, The shield member includes a microwave oven. The method according to any one of claims 1 to 6, The phase angle between one side of the cooking chamber and the stirrer, the microwave oven made of an angle between 20 degrees and 30 degrees. The method according to any one of claims 1 to 6, The end of the stirrer rod is connected to a position eccentric to one side from the center of the stirrer. The method according to claim 1, The joining protrusion is a microwave oven protrudes stepped to a smaller diameter downward from the lower side of the main body.

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