KR100739158B1 - Uniformly heating apparatus for a microwave oven with a flat table - Google Patents

Abstract

A uniform heating apparatus for a microwave oven with a flat table is provided to remove vertical and horizontal heating differences in a cooking chamber in order to uniformly heat foods. A uniform heating apparatus for a microwave oven with a flat table includes an antenna part(20), and a stirrer part(30). The antenna part is disposed in an upper casing(11). The stirrer part is disposed in a lower casing(13). The antenna part is installed at a side casing(15), and is connected to a magnetron(17) to generate electronic waves by receiving current. The magnetron is coupled to a waveguide(19) to transmit the electronic waves. The stirrer part is installed at a space between the flat table and the lower casing. The flat table is formed of glass or ceramic. The stirrer part is installed at the space under the flat table.

Description

Uniform heating device of flat table microwave oven {UNIFORMLY HEATING APPARATUS FOR A MICROWAVE OVEN WITH A FLAT TABLE}

1 is a perspective view showing a door open state of a conventional microwave oven.

2 is a schematic view of a microwave oven employing a uniform heating device of a flat table type microwave oven according to a first preferred embodiment of the present invention.

3A is a cross-sectional view for explaining a configuration of the upper antenna side of FIG. 2.

3B is a cross-sectional view for explaining a configuration of the lower stirrer side in FIG. 2.

4A is an exploded perspective view for explaining the configuration of FIG. 3A in more detail.

4B is an exploded perspective view for explaining the configuration of FIG. 3B in more detail.

5 is a schematic diagram of a microwave oven employing a uniform heating device of a flat table type microwave oven according to a second preferred embodiment of the present invention.

FIG. 6 is a cross-sectional view illustrating a configuration of a lower stirrer side of FIG. 5. FIG.

FIG. 7 is an exploded perspective view for explaining the configuration of FIG. 6 in more detail. FIG.

8 is an exploded perspective view for explaining a configuration different from that of FIG.

9A is a schematic cross-sectional view for explaining a uniform heating apparatus for a flat table microwave oven according to a third preferred embodiment of the present invention.

FIG. 9B is an enlarged view showing the side casing of FIG. 9A in more detail. FIG.

<Description of the symbols for the main parts of the drawings>

10: casing 20: antenna unit

21: antenna 23: antenna axis

27: antenna motor 29: bracket

30, 50, 60: Stirrer 31, 51, 61: Stirrer

52, 62: mobile slot 53, 63: guide slot

55,65: rotating plate 58,68: support protrusion

 The present invention relates to a microwave oven, and more particularly, to an even heating device of a flat table type microwave oven having an antenna installed at an upper portion of a cooking chamber and a rotating stirrer installed at a lower portion of the cooking chamber. will be.

A general microwave oven is an apparatus for generating electromagnetic waves using electricity, and injecting the electromagnetic waves into a cooking object to heat-cook the cooking object. Furthermore, in addition to the heating method of the microwave oven, a microwave oven range further equipped with a separate heater is also commercially available. Hereinafter, in the present specification, they are collectively referred to as a microwave oven in that they use all or part of electromagnetic waves as a heating source.

1 is a perspective view showing an open state of a conventional microwave oven.

As shown, the microwave oven is used to open and close the front side of the cooking chamber 200, and the cooking chamber 200, the cuboid-shaped casing 100, the object to be cooked as an internal space defined by such casing 100 is placed. The door 300 is rotatably coupled to the casing 100, and a control panel 400 formed on the front surface of the casing 100 and provided with a plurality of buttons for controlling the microwave oven.

Looking at the operating method of such a microwave, as the power is applied, electromagnetic waves generated in the magnetron (not shown) provided inside the casing 100 passes through the waveguide (not shown) and the antenna (not shown) in order to the cooking chamber ( 200) It is a method of heating the object (usually food) by spinning inside.

In such microwave ovens, one of the main concerns is the uniform heating of the object.

Electromagnetic waves radiated through the antenna into the cooking chamber 200 exist in the form of a specific resonance mode, and this mode inevitably forms an uneven distribution of electromagnetic energy. In view of this, in order to uniformly learn the object, a method of rotating an antenna (not shown) radiating electromagnetic waves to the cooking chamber 200 or moving the object is used.

The latter representative case uses a turntable 210 as shown in FIG. The object is placed on the turntable 210, and the turntable 210 is driven to rotate at a constant speed.

However, the turntable method as described above has a problem in that the cooking chamber 200 cannot be used completely by employing a table that rotates as the cooking chamber 200 has a form of a rectangular parallelepiped. In addition, an elongated object may be difficult to rotate.

Furthermore, the turntable method has a problem in that the cooking chamber 200 is not easily cleaned as the turntable 210 is installed on the bottom surface of the cooking chamber 200.

In order to solve this problem, the bottom surface of the cooking chamber 200 is formed of a flat table made of ceramic or glass (flat table type) and an antenna is installed below the table to radiate electromagnetic waves.

However, such a flat table method improves the cleanability, but there is a limit to uniform heating because the object cannot be moved. Furthermore, since the heating source for the object is all the antennas installed below the cooking chamber 200 and located close to the object about 10 to 20 mm, only the rotation thereof does not effectively mix the electromagnetic energy distribution. In addition, when the object is placed away from the antenna, the left and right heating deviation of the object is severe, and because the antenna and the object are disposed in close proximity, the larger the height of the object, the greater the heating deviation between the upper and lower objects.

In view of the necessity as described above, the present invention is to provide a flat table type microwave oven uniform heating device to improve the cleanability of the cooking chamber and at the same time to eliminate the vertical and horizontal heating deviation in the cooking chamber so that the object is heated uniformly. For the purpose of

 In order to achieve the above object, the uniform heating device of the flat table type microwave oven according to an aspect of the present invention, in a microwave oven for heating and cooking the object, couples with the waveguide extending into the upper casing forming the cooking chamber. An antenna which is ringed and radiates electromagnetic waves generated in the magnetron to the cooking chamber; A flat table disposed at a space apart from the lower casing in the cooking chamber and on which the object is placed; It is installed in the separation space comprises a stirrer to rotate by the driving force of the stirrer motor to mix the electromagnetic waves radiated from the antenna.

Preferably, the antenna further comprises an antenna motor coupled to the antenna to rotate the antenna.

Further, according to another aspect of the present invention, in the microwave oven for heating and cooking an object, the flat table type microwave oven is coupled to the waveguide extending into the upper casing constituting the cooking chamber is generated in the magnetron An antenna that radiates electromagnetic waves into the cooking chamber; A flat table disposed at a space apart from the lower casing in the cooking chamber and on which the object is placed; A stirrer installed in the separation space to move horizontally to mix electromagnetic waves emitted from the antenna; It comprises a moving unit for horizontally moving the stirrer.

Preferably, the antenna further comprises an antenna motor coupled to the antenna to rotate the antenna.

The moving part is disposed in the lower portion of the stirrer and the rotating plate having an eccentric protrusion inserted into the moving slot opened in the stirrer perpendicular to the moving direction of the stirrer; It may include a rotary motor coupled to the rotating plate to rotate the rotating plate.

It is preferable that the stirrer further comprises a support portion protruding from the lower casing to support the stirrer so as to move horizontally while being spaced apart from the rotating plate.

The support portion, a plurality of support protrusions protruding from the lower casing; Or a plurality of guide slots each of which is opened in the direction along the moving direction of the stirrer in the stirrer and into which the plurality of support protrusions are inserted,

A plurality of support protrusions protruding from the lower casing and having rollers mounted at upper ends thereof; The plunger may include a plurality of guide recesses each recessed in a direction along a moving direction of the stirrer to guide rollers of the plurality of support protrusions.

It is preferable that the antenna and the stirrer have a flat plate shape having a plurality of openings.

Further, the waveguide extends into the side casing to form a side waveguide, and the side casing is formed with a side slot opened so that the side waveguide is exposed into the cooking chamber.

Hereinafter, a uniform heating apparatus for a flat table microwave oven according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following, the same configuration as that shown in FIG. 1 described above will be described with reference to the illustration and reference numeral of FIG.

First, the uniform heating apparatus of the flat table type microwave oven which concerns on 1st Embodiment of this invention is demonstrated with reference to FIGS.

2 is a schematic diagram of a microwave oven employing a uniform heating device of a flat table type microwave oven according to a first preferred embodiment of the present invention.

As shown in the figure, the uniform heating device of the flat table type microwave oven is largely divided into the antenna portion 20 disposed in the upper casing 11 and the stirrer portion 30 disposed in the lower cage 13. .

The antenna unit 20 is installed in the side casing 15 and is connected to a magnetron 17 that generates electromagnetic waves by receiving a current as a user manipulates a control key of the control panel 400 to transmit electromagnetic waves 19. The electromagnetic wave is radiated to the object in the cooking chamber 200 while being rotated by being coupled to the.

The stirrer 30 is installed in the space S between the flat table 41 and the lower casing 13 and rotates to mix the electromagnetic waves radiated by the antenna unit 20 to induce uniform heating of the object. .

The flat table 41 is formed of a high temperature material such as glass or ceramic, and is a part on which an object to be cooked in the cooking chamber 200 is placed. Since the flat table 41 does not move, and the stirrer 30 is installed in the spaced space S below, it is easy to clean the flat table 41 on which the object is placed.

3 and 4, the antenna unit 20 and the stirrer unit 30 will be described in more detail.

Here, FIG. 3A is a cross-sectional view for explaining the configuration of the upper antenna side of FIG. 2, FIG. 3B is a cross-sectional view for explaining the configuration of the lower stirrer side of FIG. 2, and FIG. 4A shows the configuration of FIG. 3A in more detail. It is an exploded perspective view for demonstrating, FIG. 4B is an exploded perspective view for demonstrating the structure of FIG. 3B in more detail.

As shown in FIGS. 3A and 4A, the antenna unit 20 is used for the antenna 21 for emitting electromagnetic waves into the cooking chamber 200, the motor 27 for rotating the antenna 21, and a combination thereof. Bracket 29 to be included.

The antenna 21 has the shape of a circular disk and has an antenna axis 23 projecting perpendicularly from the plane formed by the antenna 21. The antenna shaft 23 penetrates through the opening formed in the waveguide 19 to be coupled to the motor shaft 27 ′ of the antenna motor 27. Accordingly, the antenna 21 emits electromagnetic waves while rotating, thereby forming a more uniform electromagnetic energy distribution pattern in the cooking chamber 200 than when not rotating. Furthermore, a plurality of openings 25 are formed in the antenna 21 to adjust the radiation characteristics of the electromagnetic waves.

As shown in FIGS. 3B and 4B, the stirrer 30 includes a stirrer 31, a stirrer motor 37 for driving the stirrer 31 to rotate, and a bracket 39 used for coupling thereof. ).

The stirrer 31 is configured to mix the electromagnetic waves radiated from the antenna 21 and rotate to solve the heating deviation of the object placed on the flat table 41. The stirrer 31 also has the shape of a circular disk, and a stirrer shaft 33 protruding perpendicular to the plane formed thereon is coupled to rotate with the motor shaft 37 ′ of the stirrer motor 37. Furthermore, a plurality of openings 35 are formed in the stirrer 31 to adjust reflection characteristics of electromagnetic waves.

Next, a uniform heating apparatus for a flat table type microwave oven according to a second preferred embodiment of the present invention will be described with reference to FIGS. 5 to 8. However, since the antenna unit 20 is the same as the case of the first embodiment, it will not be described.

5 is a schematic diagram of a microwave oven employing a uniform heating device of a flat table type microwave oven according to a second preferred embodiment of the present invention.

As shown in the figure, the stirrer portion 50, which together with the antenna portion 20, forms a uniform heating device of a flat table type microwave oven, as in the first embodiment, between the lower casing 13 and the flat table 41. Is placed on.

The stirrer 50 is configured to move horizontally in the cooking chamber 200. Moreover, as a moving part for horizontally moving the stirrer 51 or 61 (refer FIG. 6-8), the rotating plate 55 or 65 (refer FIG. 6-8) is provided.

The configuration of the stirrer 50 for horizontal movement will be described with reference to FIG. 6. Here, FIG. 6 is sectional drawing for demonstrating the structure of the stirrer part 50 of FIG.

The stirrer portion 50 includes a stirrer 51 for mixing the electromagnetic wave radiated by the antenna 21 while horizontally moving, a rotating plate 55 rotating to move the stirrer 51, and a rotating plate 55. It comprises a rotating motor 57 for rotating the support projections 58 for supporting the stirrer 51 to move horizontally.

The stirrer 51 is arrange | positioned at the space | interval space S with the flat table 41 at regular intervals. The lower plate of the stirrer 51 is disposed with a rotary plate 55 protruding from the lower casing (13).

The rotating plate 55 rotates the rotation shaft 55 'about the central axis, and moves the stirrer 51 in the horizontal direction through the eccentric protrusion 56 protruding on the surface facing the stirrer 51.

The rotation of the rotary plate 55 is coupled to the lower casing 13 by the motor bracket 59, and coupled to the rotary shaft 55 'via the motor shaft 57' to the rotary motor 57 to provide rotational force. Is made by

Furthermore, in order to make the stirrer 51 move horizontally more smoothly without placing the stirrer 51 directly on the rotating plate 55, the plurality of supports are supported as lifting portions for lifting the stirrer 51 at regular intervals from the rotating plate 55. The projection 58 is formed to protrude from the lower casing 13.

The detailed configuration of the stirrer portion 50 will be described in more detail with reference to FIG. 7. 7 is an exploded perspective view for explaining the configuration of FIG. 6 in more detail.

The stirrer 51 is formed as a flat plate of a rectangular shape according to the shape of a conventional cooking chamber 200. In the center, an eccentric protrusion 56 formed on the rotating plate 55 is inserted, and a movement slot 52 for guiding the stirrer 51 to move horizontally with the rotational force is opened, and a support protrusion 58 is formed at the edge thereof. Guide slots 53 are inserted which are inserted to assist such movement. In addition, a plurality of openings 54 are formed in the remaining portion to prevent re-emission of electromagnetic waves.

The rotating plate 55 has a circular disk shape and an eccentric protrusion 56 eccentrically formed at the center thereof. At the center of the opposite side of the surface on which the eccentric protrusion 56 is formed, a rotation shaft 55 ′ connected to the motor shaft 57 ′ of the rotation motor 57 is formed. The rotary motor 57 is coupled to the lower casing 13 using the motor bracket 59.

The support protrusion 58 is a plurality of support pillars protruding from the lower casing 13, and are spaced apart from the rotation region of the rotating plate 55. The support protrusion 58 has an upper end stepped so that only the stepped part is inserted into the guide slot 53 of the stirrer 51. Although not shown, a roller may be formed at the upper end of the support protrusion 58, and the guide slot 53 may be recessed without opening to form an induction recess for accommodating the roller. In this case, friction between the support protrusion 58 supporting the moving stirrer 51 is reduced, and the movement thereof will be more smooth.

In addition, although the guide slot 53 formed in the direction as it moves in the width direction of the microwave oven, and the stirrer 51 which the moving slot 52 formed in the width direction perpendicular | vertical opened in this figure are shown, the thickness is shown in FIG. A stirrer moving in the direction can also be considered.

Thus, the stirrer part 60 which has the stirrer 61 moving to thickness direction is demonstrated with reference to FIG. Here, FIG. 8 is an exploded perspective view for explaining the stirrer portion moving in the width direction unlike in FIG. 7. Further, the coupling and operating relationship of each of the rotor plate 65 and the motor 67 and the bracket 69 is the same as in the corresponding rotor plate 55 and the motor 57 and the bracket 59 of FIG. The description is omitted.

A moving slot 62 opened perpendicular to the moving direction of the stirrer 61 moving in the width direction is opened at the center portion of the stirrer 61, and the edge of the stirrer 61 is opened along the moving direction of the stirrer 61. An induction slot 63 is opened to assist the movement. In the remaining portion, a plurality of openings 64 are formed to prevent the radiation of electromagnetic waves.

Corresponding to the configuration of the guide slot 63, the lower casing 13 is formed with support protrusions 67 arranged along the moving direction of the stirrer 61, that is, in the width direction. At least one insertion protrusion 68 ′ is formed on the support protrusion 68 to be inserted into the guide slot 63.

Now, the movement of the stirrers 51 and 61 according to the configuration of the stirrers 50 and 60 in FIG. 7 and FIG. 8 will be described below.

As the rotary plates 55 and 65 connected to the center of the rotary motors 57 and 67 rotate, the eccentric protrusions 56 and 66 eccentrically formed at the center rotate while drawing a certain circle. The eccentric protrusions 56 and 66 are limited to the paths along the moving slots 52 and 62 which are disposed perpendicularly to the moving direction (width direction or thickness direction) of the stirrers 51 and 61, and the stirrer. Horizontally move (51, 61).

At this time, the upper end portions of the support protrusions 58 and 68 are inserted into the guide slots 53 and 63 opened along the moving directions of the stirrers 51 and 61 to support the horizontal moving stirrers 51 and 61. .

As described above, the antenna 21 is installed above the cooking chamber 200, and further rotates, is coupled to the waveguide 19 to radiate electromagnetic waves generated by the magnetron 17, and at the same time, the flat table of the cooking chamber 200. (41) In the spaced space S below, when the stirrers 51 and 61 move in the horizontal direction, the energy of the radiated electromagnetic waves is evenly mixed. As a result, the vertical and horizontal heating variations of the object placed on the flat table 41 become small, and the object is heated uniformly.

Finally, with reference to FIG. 9, the 3rd Example of the uniform heating apparatus of a flat table type microwave oven is demonstrated.

9A is a schematic cross-sectional view illustrating a uniform heating apparatus of a flat table type microwave oven according to a third exemplary embodiment of the present invention, and FIG. 9B is an enlarged view illustrating the side casing of FIG. 9A in more detail. .

In this embodiment, the side casing 15 includes the antenna portion 20 of the first and second embodiments described above, and the waveguide 19 extending into the upper casing 11 together with the stirrer portions 30, 50, and 60. It also has a side waveguide 19 'formed to extend.

In addition, the side waveguide 19 'is exposed to the cooking chamber 200 at the side of the cooking chamber 200 of the side casing 15 so as to directly emit electromagnetic waves generated from the magnetron 17. .

Accordingly, in addition to the operations described in the first and second embodiments, electromagnetic waves are also applied to the object on the side through the side casing 15.

 As described above, the uniform heating device of the flat table type microwave oven according to the present invention employs a flat table to improve the cleanability of the cooking chamber, and at the same time, the rotating antenna of the upper part of the cooking chamber and the rotating or horizontal moving stirrer of the lower part of the cooking chamber. In this case, there is an effect such that the object is heated more evenly by reducing the vertical and horizontal heating deviation of the object in the cooking chamber.

Claims (10)

In a microwave oven for heating an object to cook, An antenna coupled to a waveguide extending into the upper casing constituting the cooking chamber to radiate electromagnetic waves generated in the magnetron to the cooking chamber, the antenna having a plurality of openings; A flat table disposed at a space apart from the lower casing in the cooking chamber and on which the object is placed; And a stirrer installed in the separation space and rotating with a driving force of the stirrer motor so as to mix the electromagnetic waves radiated from the antenna, and having a plurality of openings formed therein. The method of claim 1, And an antenna motor coupled to the antenna to rotate the antenna. In a microwave oven for heating an object to cook, An antenna coupled to the waveguide extending into the upper casing constituting the cooking chamber to radiate electromagnetic waves generated in the magnetron to the cooking chamber; A flat table disposed at a space apart from the lower casing in the cooking chamber and on which the object is placed; A stirrer installed in the separation space to move horizontally to mix electromagnetic waves emitted from the antenna; Flat table type microwave oven uniform heating device comprising a moving unit for horizontally moving the stirrer. The method of claim 3, And an antenna motor coupled to the antenna to rotate the antenna. The method of claim 3, The moving part is disposed in the lower portion of the stirrer and the rotating plate having an eccentric protrusion inserted into the moving slot opened in the stirrer perpendicular to the moving direction of the stirrer; Flat table type microwave oven heating device comprising a rotary motor coupled to the rotary plate to rotate the rotary plate. The method of claim 5, And a support for protruding from the lower casing to support the stirrer so that the stirrer moves horizontally while being spaced apart from the rotating plate. The method of claim 6, The support portion, a plurality of support protrusions protruding from the lower casing; And a plurality of induction slots each of which is opened in the direction along the moving direction of the stirrer in the stirrer, into which the plurality of support protrusions are inserted. The method of claim 6, The support part may include a plurality of support protrusions protruding from the lower casing and having rollers mounted at upper ends thereof; And a plurality of induction recesses each recessed in the stirrer in a direction along the moving direction of the stirrer to guide the rollers of the plurality of support protrusions. delete The method according to any one of claims 1 to 8, And the waveguide extends into the side casing to form a side waveguide, and the side bouquet is formed with a side slot opened to expose the side waveguide into the cooking chamber.

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