JP3910115B2 - High frequency heating device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a high-frequency heating apparatus (hereinafter sometimes referred to as “microwave oven”), and more particularly to a rotating antenna type high-frequency heating apparatus.
[0002]
[Prior art]
The uniform heating method in the heating chamber of the microwave oven is roughly divided into a turntable method, a stirrer method, and a rotating antenna method. These uniform heating methods will be briefly described below. First, in the turntable method, by placing an object to be heated on a turntable disposed on the bottom surface of the heating chamber and rotating the turntable, a high frequency radiated from an opening provided on the side wall surface or top surface of the heating chamber is obtained. It irradiates and heats the entire object to be heated uniformly, and is the most widely used method in a microwave oven at present. 20 and 21 are a cross-sectional view and a perspective view showing an example of this type of microwave oven. A motor 5 is disposed on the bottom outer surface of the heating chamber 1, and a shaft 51 of the motor 5 protrudes from the bottom surface of the heating chamber 1 through a through hole formed in the bottom surface of the heating chamber 1. A disc-shaped turntable T is pivotally supported on the shaft 51 protruding from the bottom surface of the heating chamber 1, and the turntable T is rotated by driving the motor 5. On the other hand, the high frequency radiated from the magnetron (high frequency generator) 2 passes through the waveguide 33 and is radiated from the opening 101 on the side surface of the heating chamber 1 to the heating chamber 1 to be heated (not shown) on the rotating turntable T. ) And heat. In addition to this, as a rotational drive system of the turntable T, those utilizing magnetic coupling are disclosed in, for example, Japanese Patent Publication Nos. 61-13359, 58-220387, and 59-14294. Yes.
[0003]
22 and 23, the Stirrer system is generally provided by providing a metal radio wave diffusion blade 32 in the vicinity of the heating chamber side of the opening 101 provided on the top surface of the heating chamber 1 and rotating it with a motor 31. In this method, the intensity of the high-frequency electric field radiated from the magnetron 2 is changed and radiated from the opening 101 into the heating chamber 1. According to this method, the object to be heated can be heated uniformly without being moved. The object to be heated is placed on a placing table T ′ made of a substantially rectangular dielectric (usually made of glass, ceramic, etc.).
[0004]
For example, as shown in FIG. 24, the rotating antenna system guides the high frequency radiated from the magnetron 2 to the outer bottom portion of the heating chamber 1 through the waveguide 3, while the antenna 4 is connected to the opening 11 formed on the bottom surface of the heating chamber 1. The receiving unit 41 is inserted and protruded into the waveguide 3, the high frequency in the waveguide 3 is propagated from the receiving unit 41 to the radiating unit 42, and the radiating unit 42 of the antenna 4 is rotated by the motor 5. In this way, the object to be heated is uniformly heated at a high frequency (for example, Japanese Patent Application Laid-Open No. 11-8057). The object to be heated is placed on a placing table 6 made of a dielectric (usually glass, ceramic, etc.) provided in a shape that partitions the heating chamber 1 near the upper side of the antenna 4. In this method, since an object to be heated can be placed in the vicinity of the radiating portion 42 of the antenna 4 that radiates a high frequency, it is generally superior in heating efficiency compared to other methods. At present, it is a method that is becoming widespread as a microwave oven for use in business / convenience stores.
[0005]
In the above-described uniform heating method of the heated object, the turntable method rotates and heats the heated object, whereas the stirrer method and the rotating antenna method heat the heated object in a stationary state. From the viewpoint of uniformity of heating, it is generally said that the turntable method, rotating antenna method, and stirrer method are superior in this order.
[0006]
On the other hand, the area where the object to be heated can be placed in the heating chamber is only a circular turntable area in the turntable method, whereas in the stirrer method and the rotating antenna method, it is not necessary to move the object to be heated. The entire bottom surface of the heating chamber. Therefore, the latter can use the heating chamber more effectively, and when the volume of the heating chamber is the same, the amount of the object to be heated is larger in the latter.
[0007]
From the standpoint of cleaning the bottom of the heating chamber, the turntable method using magnetic coupling and the stirrer method do not require a through hole in the bottom of the heating chamber. It is almost flat and can be cleaned relatively easily. On the other hand, in the case of the rotating antenna method, the mounting table fixed on the antenna is practically equivalent to the bottom wall of the heating chamber, and the surface of the mounting table is flat, and unlike the turntable method or the stirrer method. Since the material is a dielectric material such as glass or ceramic, the cleaning property is extremely excellent.
[0008]
In recent years, the viewpoints of heating efficiency, effective use volume in the heating chamber, and ease of cleaning of the heating chamber have come to be emphasized, and a rotating antenna type microwave oven has been reviewed for general household use.
[0009]
[Problems to be solved by the invention]
By the way, in recent microwave ovens, in addition to the heating method by high frequency heating, those having a composite function capable of performing grill heating or oven heating by a heater have been developed. In grill heating, a glass tube heater or a sheathed heater is installed at a position off the center of the top of the heating chamber, these heaters are heated to a surface temperature of 600 ° C. or more, and the object to be heated is rotated to move the whole. Bake uniformly at high speed.
[0010]
On the other hand, in the case of a conventional rotating antenna type microwave oven, since the object to be heated is stationary on the mounting table, as shown in FIG. It is necessary to arrange the heater H over the entire ceiling surface of the heating chamber 1. However, when the heater H is disposed on the entire ceiling surface, the occupied area is increased, so that the heat generation temperature of the heater H is lowered and the heating time is increased. Further, if the heating time is shortened, there is a problem that the power consumption of the heater increases.
[0011]
In addition, due to the object to be heated being stationary, the rotating antenna method sometimes fails to obtain a satisfactory finished state in egg dishes such as tea fumigation that require delicate heating uniformity.
[0012]
On the other hand, some recent microwave ovens have a food stirring function. If this is used, it can be cooked consistently from the preparation of the cooking to the heating finish, for example, stewed dishes such as curry or making bread dough. An example of such a microwave oven is shown in FIG. The microwave oven shown in FIG. 26 is a turntable type microwave oven. Instead of the turntable, a container 5 having a stirring blade 83 inside is provided in the heating chamber 1 and a motor 5 for rotating the turntable. The rotating shaft 82 of the stirring blade 83 is connected to the shaft 51, and the stirring blade 83 is rotated in the container 8 to stir the food (for example, Japanese Patent Laid-Open Nos. 10-211098 and 11-121161). Publication).
[0013]
On the other hand, the conventional rotating antenna type microwave oven does not have a mechanism for driving the stirring blades, so that such an automatic stirring function cannot be added.
[0014]
The present invention has been made in view of such conventional problems, and the object of the present invention is to increase the heating efficiency by grill heating or oven heating while maintaining the conventional advantages in a microwave oven of a rotating antenna system. Also, it is intended to obtain subtle heating uniformity during high frequency heating.
[0015]
It is another object of the present invention to enable automatic stirring of food materials in a container placed in a heating chamber in a rotating antenna type microwave oven.
[0016]
[Means for Solving the Problems]
In order to achieve the above object, in the high frequency heating device according to the present invention, a heating chamber for heating an object to be heated, a high frequency generator for generating a high frequency, and a high frequency generated by the high frequency generator are formed in the heating chamber. A waveguide leading to the opening; a rotatable antenna having a receiving part and a radiating part for supplying a high frequency in the waveguide to the heating chamber through the opening; a motor for rotating the antenna; In a high-frequency heating apparatus provided with a mounting table made of a dielectric provided in the form of partitioning the heating chamber in the vicinity of the upper part of the antenna, a rotating member is arranged on the mounting table, and the rotating member and the antenna A magnet is provided on both sides, or a magnet is provided on one side and a magnetic body is provided on the other side. The magnetic coupling between the antenna and the rotating member is utilized to cope with the rotation of the antenna. And configured to rotate the rotating member.
[0017]
Here, when the rotating member is a turntable on which an object to be heated is placed, the above structure allows the object to be rotated and placed while being a rotary antenna type microwave oven, and grill heating or oven heating is possible. The heating efficiency can be improved and the object to be heated can be uniformly heated at a high frequency.
[0018]
In addition, from the viewpoint of making the rotation of the turntable smoother, the turntable includes a support body having a plurality of wheels and magnets, and a table for placing an object to be heated, supported by the support body. The thing provided with is preferable. In addition, when performing high-frequency heating, it is desirable that the table is brought into contact with and supported by the wheel and rotated by the rotation of the wheel in order to rotate the table faster than the antenna.
[0019]
From the viewpoint of strength and durability, the support is preferably made of a metal material. In this case, it is desirable to provide an opening or a notch in the support in order to pass a high frequency radiated from the antenna.
[0020]
On the other hand, when the rotating member is a stirring member provided in a container disposed on the mounting table, the advantage of the rotating antenna type microwave oven that the bottom surface of the heating chamber is easy to clean with a flat surface without holes. While holding, the food in the container placed in the heating chamber can be stirred with the stirring member.
[0021]
In order for the stirring member to rotate smoothly in the container and to effectively stir the object to be heated, the stirring member includes a disc-shaped base, a stirring blade formed with the base, and a peripheral portion of the base. It is preferable to have two or more wheels pivoted on the vehicle.
[0022]
From the viewpoint of preventing the magnetic coupling due to the center displacement of the stirring blade and obtaining a stable stirring function, a protrusion is provided at the center of the inner bottom surface of the container, and a through hole is provided at the center of the stirring member. It is desirable that the stirring member is mounted in the container so that a portion is inserted into the through hole, and the stirring member rotates around the protrusion.
[0023]
From the viewpoint of widening the range of cooking methods, an electric heater may be further provided in the high-frequency heating device.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the high-frequency heating device (microwave oven) of the present invention will be described with reference to the drawings. However, the present invention is not limited to these embodiments.
[0025]
An external perspective view showing an example of a microwave oven according to the present invention is shown in FIG. The front and side sectional views are shown in FIGS. 2 and 3, respectively. The microwave oven according to the present invention includes a heating chamber 1 having a substantially rectangular parallelepiped shape made of a metal material, and a waveguide 3 provided outside the bottom surface of the heating chamber 1 so as to be adjacent to the heating chamber 1. A magnetron (high frequency generator) 2 is attached to one end of the waveguide 3, and an opening 11 communicating with the heating chamber is formed at the other end. On the other hand, an antenna 4 is disposed at the bottom of the heating chamber 1. The antenna 4 includes a cylindrical receiving portion 41 and a disk-shaped radiating portion 42 attached to the upper end portion of the receiving portion 41, and a first magnet is formed at an equal angle in the circumferential direction on the upper surface of the radiating portion 42. 43 is disposed, and a protective member 44 is attached so as to cover the first magnet 43.
[0026]
The cylindrical receiving portion 41 is inserted into the opening 11 formed in the bottom surface of the heating chamber 1 and protrudes into the waveguide 3, and the lower end portion of the receiving portion 41 is arranged on the outer bottom surface of the waveguide 5. 51 shafts are connected. Thereby, the antenna 4 is rotated by driving the motor 5.
[0027]
A mounting table 6 for partitioning the inside of the heating chamber 1 is attached in the vicinity of the upper portion of the antenna 4 in the heating chamber 1. The mounting table 6 is made of a dielectric material such as glass or ceramic and transmits high frequencies. As will be described later, when the object to be heated is heated only by high-frequency heating, the object to be heated S may be placed directly on the mounting table 6. The mounting table 6 made of glass, ceramics, or the like has a smooth surface and is significantly more cleanable than a metal member.
[0028]
A rotating table (rotating member) 7 on which the object to be heated S is mounted is disposed on the upper surface of the mounting table 6. The turntable 7 includes a disk-shaped support body 71 and a table 72 supported on the upper surface of the support body 71. A plurality of wheels 75 are supported by a shaft 76 on the peripheral wall of the support 71, and a second magnet 73 is attached to and covers the bottom surface of the support 71 at a position corresponding to the first magnet 43. Thus, a protective member 74 is provided. As a result, when the antenna 4 rotates, the support 71 rotates due to the magnetic coupling between the first magnet 43 and the second magnet 73, and the table 72 supported on the support 71 also rotates. In addition, even if either one of the first magnet 43 and the second magnet 73 is a magnetic body, magnetic coupling occurs and the same action is obtained. A heater H used for grill heating is attached at a position off the center of the ceiling wall of the heating chamber 1.
[0029]
In the microwave oven having such a configuration, the high frequency generated from the magnetron 2 reaches the receiving unit 41 of the antenna 4 through the waveguide 3. Then, the light is transmitted from the receiving unit 41 to the radiating unit 42 and radiated into the heating chamber 1. Here, since the radiating portion 42 is rotated by the motor 5, the high frequency is radiated uniformly into the heating chamber. FIG. 6 is a perspective view showing an example of an antenna. In the antenna of this figure, the high frequency is mainly radiated from the end portions of the openings 45 and 46 formed in the radiating portion 42. Of course, the shape of the antenna 4 is not limited to this. For example, the radiating portion 42 may have a rod shape or a long plate shape.
[0030]
The high frequency radiated from the radiating portion 42 of the antenna 4 passes through the mounting table 6 and is reflected directly or reflected on the inner wall of the heating chamber to be applied to the object S to be heated and heated. Here, in the case where the object to be heated S is heated only by the high frequency, as shown in FIG. 4, the rotating base 7 is removed from the heating chamber 1, and the object to be heated S is placed on the mounting table 6 and the high frequency heating is performed. I do. Thereby, the characteristics of the conventional rotating antenna system are maintained as they are. That is, as described above, the antenna 4 rotates just below the mounting table 6 on which the object to be heated S is placed and uniformly irradiates the object to be heated with the high frequency, so that the object to be heated S is heated evenly. In this case, the entire space in the heating chamber 1 can be used effectively.
[0031]
On the other hand, when performing grill heating, as shown in FIG. 2, the turntable 7 is installed on the placing table 6, and the object S to be heated is placed on the table 72 of the turntable 7. When the antenna 4 is rotated by driving the motor 5, the table 72 is also rotated together with the support 71 by the magnetic coupling between the first magnet 43 and the second magnet 73. As shown in FIG. 3, the heater H for heating the grill is installed at a position slightly off the right side from the center of the heating chamber 1. It becomes possible to heat uniformly. In the case of performing the grill heating, even if the rotation speed of the table 72 is the same as the rotation speed of the antenna 4, the heating performance is not affected. Therefore, as shown in FIG. The table 72 is supported by the support 71 in a state in which no contact is made.
[0032]
On the other hand, in the case of using both high-frequency heating and grill heating, the object to be heated S is placed on the table 72 of the turntable 7 as in the case of grill heating, and the first magnet 43 and the second magnet 73 are Using the magnetic coupling, the turntable 7 is rotated by the rotation of the antenna 4. However, in this case, it is necessary to make the rotation speed of the antenna 4 different from the rotation speed of the table 72 on which the object to be heated S is placed. This is because, when the rotation speeds of the antenna 4 and the table 72 are the same, the high frequency radiated from the antenna 4 is applied only to a specific portion of the object S to be heated. Here, in order to make the rotation speed of the antenna 4 and the table 72 different, for example, as shown in FIG. 7, the lower surface of the table 72 is brought into contact with a wheel 75 ′ attached to the peripheral wall of the disk-like support 71. The table 72 is supported by the wheel 75 'and is simultaneously rotated. According to this configuration, the support 71 rotates at the same speed as the antenna 4, while the table 72 supported by the wheel 75 ′ of the support 71 rotates at twice the rotation speed of the antenna 4. . As a result, the entire heated object S on the table 72 can be heated uniformly. In addition, when only the high frequency heating is used and the turntable 7 is used, the rotation speeds of the antenna 4 and the table 72 may be made different similarly.
[0033]
The support 71 used in the present invention is preferably made of a metal material in consideration of heat resistance and strength during heating of the heater. However, in this case, since the metal material does not transmit high frequency, for example, as shown in FIG. 8, an opening 77 through which high frequency can pass is provided, or the other part is left leaving the skeleton of the support 71 as shown in FIG. It is desirable to cut out the space.
[0034]
In addition, the table 72 used in the present invention is not particularly limited as long as high-frequency heating is used so long as it transmits high-frequency waves. From the viewpoint of strength and cleanability, a table made of glass or ceramic is recommended. Further, a non-magnetic metal table is desirable for grill heating and convection heating.
[0035]
Next, another embodiment of the microwave oven according to the present invention will be described. A major feature of this microwave oven is that the stirring member (rotating member) disposed in the container is rotated by utilizing the magnetic coupling by rotating the antenna. FIG. 10 is a front sectional view showing an example of the microwave oven according to the present invention. The description of the same configuration as the microwave oven in FIG. 1 is omitted, and the different configuration will be described below.
[0036]
A stirring container (rotating member) 8 made of a dielectric is placed on the mounting table 6, and a stirring member 9 is disposed in the stirring container 8. The stirring member 9 includes a disk-shaped base 91, a stirring blade 92 erected on the upper surface of the base, and a wheel 95 pivoted on the peripheral portion of the base 91. A through-hole 96 is formed at the center of the base 91, and the through-hole 96 is inserted into a protrusion 81 formed at the center of the bottom surface of the stirring container 8, and the stirring member 9 is rotated so as to rotate around the protrusion 81. Is attached to the inside 8 of the container. A second magnet 93 is attached to the lower surface of the base 91 at a position corresponding to the first magnet 43 disposed on the upper surface of the antenna 4.
[0037]
When the object to be heated is heated using the microwave oven having such a configuration, the object to be heated (not shown) is put into the container 8 and then the motor 5 is driven to rotate the antenna 4. At this time, due to the magnetic coupling between the first magnet 43 and the second magnet 93, the stirring member 9 in the container 8 also rotates in response to the rotation of the antenna 4, whereby the stirring blade 92 of the stirring member 9 The object to be heated is stirred. Accordingly, the object to be heated in the container 8 can be heated at a high frequency and stirred by the stirring member 9 at the same time, and according to such a microwave oven, for example, a stewed dish such as curry or a bread dough is prepared. Can be cooked consistently from cooking to finishing.
[0038]
Further, the through hole 96 formed in the stirring member 9 is inserted into the protrusion 81 formed at the center of the bottom surface of the stirring container 8, and the stirring member 9 is rotated around the protrusion 81. Even when a strong force is applied to the stirring blade 92 from the heated object, the center of the stirring member 9 is not displaced, and the magnetic coupling between the first magnet 43 and the second magnet 93 is not eliminated. Thereby, a stable stirring function can be obtained.
[0039]
Another embodiment of the microwave oven according to the present invention is shown in FIG. A major feature of the microwave oven of FIG. 11 is that a regulating member 47 that regulates the movement of the antenna 4 in the axial direction is provided on the upper surface of the radiating portion 42. Thereby, it is possible to prevent the antenna 4 from moving upward in the axial direction due to magnetic coupling, and the radiation portion 42 of the antenna 4 from being in surface contact with the lower surface of the mounting table 6. The description of the same configuration as the microwave oven in FIG. 1 is omitted, and the different configuration will be described below.
[0040]
In the microwave oven of FIG. 11, convex portions (regulating members) 47 are provided on the upper surface of the radiating portion 42 of the antenna 4 at equal angles in the circumferential direction. In a state where the turntable 7 is installed on the mounting table 6, the antenna 4 moves upward by the magnetic attractive force of the first magnet 43 and the second magnet 73. The projecting portion 47 formed in the contact with the lower surface of the mounting table 6 prevents the radiating portion 42 from being in surface contact with the mounting table 6.
[0041]
FIG. 12 shows another form of the antenna. In this antenna, a wheel 48 pivotally supported on the outer periphery of the disk-shaped radiating portion 42 is used as a regulating member. That is, the wheel 48 is attached to the radiating portion 42 so that the upper end of the wheel 48 protrudes from the upper surfaces of the radiating portion 42 and the protection member 44. FIG. 13 shows a partial cross-sectional view when this antenna is arranged in a microwave oven. As is apparent from this figure, when the turntable 7 is not disposed on the mounting table 6, there is a gap d between the upper end of the wheel 48 and the mounting table 6, while the lower end of the wheel 48 is the heating chamber. 1 is in contact with the bottom surface. When the microwave oven is used in this state, for example, when only high-frequency heating is performed, the antenna 4 is rotated by driving the motor 5, and accordingly, the wheel 48 rolls on the bottom surface of the heating chamber 1. Thereby, the parallelism of the radiation | emission part 42 and the bottom face of the heating chamber 1 is ensured. Of course, the wheel 48 may not be in contact with the bottom surface of the heating chamber 1.
[0042]
On the other hand, a partial cross-sectional view when the turntable 7 is arranged on the mounting table 6 is shown in FIG. At this time, the antenna 4 moves upward in the axial direction by the magnetic attractive force of the first magnet 43 and the second magnet 73, but the upper end of the wheel 48 supported on the outer periphery of the radiating portion 42 is at the top of the mounting table 6. The movement is regulated by contacting the lower surface. The moving distance of the antenna 4 in the axial direction is preferably 5 mm or less. When the moving distance of the antenna 4 exceeds 5 mm, the change in the distance between the radiating portion 42 of the antenna 4 and the bottom surface of the heating chamber 1 and the amount of protrusion of the receiving portion 41 to the waveguide 3 is too large, and the high frequency is radiated stably. It is because there is a possibility that it cannot be done. A more preferable moving distance is 1 mm or less. The moving distance of the antenna can be substantially adjusted by adjusting the gap d between the upper end surface of the wheel 48 and the lower surface of the first mounting table 6 shown in FIG.
[0043]
When a microwave oven is used in this state, for example, when high-frequency heating and grill heating are used together, the antenna 4 is rotated by driving the motor 5, and the wheels 48 roll on the lower surface of the mounting table 6. This prevents the peripheral edge of the radiating portion 42 from bending upward in the axial direction due to the magnetic attractive force, and ensures the parallelism between the radiating portion 42 and the mounting table 6.
[0044]
As still another embodiment of the microwave oven according to the present invention, even when the heating chamber 1 is made of a magnetic material, a magnetic attractive force is not generated between the first magnet 43 and the bottom surface of the heating chamber 1. In order to rotate the antenna 4 smoothly and to rotate the turntable 7 smoothly with the rotation of the antenna 4 by the magnetic attraction force of the first magnet 43 and the second magnet 73. It is good also as a structure which covers the mounting base side of the one magnet 43 with a nonmagnetic member, and covers the bottom face side of the heating chamber 1 with a magnetic member. 15 and 16 are a front sectional view and a partial sectional view showing an example of such a microwave oven. The description of the same configuration as the microwave oven in FIG. 1 is omitted, and the different configuration will be described below.
[0045]
In the microwave oven of FIG. 15, since the upper side of the first magnet 43 attached to the lower surface of the radiating portion 42a is the radiating portion 42a of the antenna made of alumina (non-magnetic material), the first magnet 43 and the second magnet 43 Magnetic coupling with the magnet 73 is ensured. On the other hand, since the lower side of the first magnet 43 is covered with the magnetic member 413, no magnetic attractive force is generated between the bottom surface of the heating chamber 1 made of a magnetic material and the first magnet 43, The radiation part 42a of the antenna 4 can rotate smoothly. For this reason, due to the rotation of the antenna 4, the support 71 rotates at the same speed as the antenna 4, and the table 72 supported by the wheels 75 rotates at a speed twice that of the antenna 4. As a result, the object to be heated S placed on the table 72 is uniformly irradiated with the high frequency radiated from the radiating portion 42a and the heat from the heater H.
[0046]
Here, if the radiation part 42a and the magnetic member 413, which are non-magnetic members, are formed of metal members, the influence of the high frequency on the first magnet 43 can be reduced.
[0047]
Another embodiment of the antenna 4 is shown in FIG. In the antenna 4 of FIG. 17, a recess 415 that is equiangular in the circumferential direction of the lower surface of the radiating portion 42 b and deeper than the thickness of the first magnet 43 is provided, and the first magnet 43 is attached thereto. The opening of the recess 415 is closed by a flat magnetic member 414. According to such a configuration, positioning at the time of mounting the first magnet 43 is facilitated, the processing of the magnetic member 414 is facilitated, and the apparatus can be thinned.
[0048]
FIG. 18 is a partial cross-sectional view showing another embodiment of the microwave oven of the present invention. In the microwave oven of FIG. 18, the first magnet 43 is attached to the upper surface of the radiating portion 42 c made of a magnetic material at an equal angle in the circumferential direction, and the surface is covered with a nonmagnetic member 416. With this configuration, similarly to the above, no magnetic attractive force is generated between the bottom surface of the heating chamber 1 made of a magnetic material and the first magnet 43, and the radiating portion 42c of the antenna 4 rotates smoothly. On the other hand, since the upper side of the first magnet 43 is the nonmagnetic member 416, the magnetic coupling between the first magnet 43 and the second magnet 73 is ensured.
[0049]
Another embodiment of the antenna 4 is shown in FIG. In the antenna 4 of FIG. 19, a concave portion 418 is provided at an equal angle in the circumferential direction of the upper surface of the radiating portion 42 d and deeper than the thickness of the first magnet 43, and the first magnet 43 is attached thereto. The opening of the recess 418 is closed with a flat nonmagnetic member 417. According to such a configuration, similarly to the above, positioning at the time of mounting the first magnet 43 is facilitated, the processing of the nonmagnetic member 417 is facilitated, and the apparatus can be thinned.
[0050]
【The invention's effect】
In the high-frequency heating device according to the present invention, a rotating member is arranged on the mounting table, and a magnet is provided on both of the rotating member and the antenna, or a magnet is provided on one side and a magnetic body is provided on the other side, and the antenna and the rotating member are provided. Since the rotating member is rotated in response to the rotation of the antenna using the magnetic coupling between the rotating member and the rotating member is a rotating table for placing an object to be heated, While maintaining the advantages of the rotating antenna type high-frequency heating device, heating efficiency by grill heating or oven heating can be enhanced, and subtle heating uniformity can be obtained.
[0051]
In addition, when the rotating member is a stirring member provided in a container placed on the mounting table, the advantage of the rotating antenna type microwave oven that the bottom surface of the heating chamber is a flat surface without holes and easy to clean. The ingredients in the container placed in the heating chamber can be agitated with the agitating member.
[Brief description of the drawings]
FIG. 1 is an example of an external view of a microwave oven according to the present invention.
FIG. 2 is a front sectional view of the microwave oven of FIG.
3 is a side sectional view of the microwave oven of FIG. 1. FIG.
FIG. 4 is a state diagram when an object to be heated is placed on a mounting table for high-frequency heating.
FIG. 5 is a state diagram when the antenna and the table rotate at the same speed.
FIG. 6 is a perspective view showing an example of an antenna.
FIG. 7 is a state diagram when the antenna and the table rotate at different speeds.
FIG. 8 is a perspective view showing an example of a support.
FIG. 9 is a plan view showing another example of a support.
FIG. 10 is a front cross-sectional view showing another embodiment of the microwave oven according to the present invention.
FIG. 11 is a front sectional view showing another example of the microwave oven according to the present invention.
FIG. 12 is a perspective view showing another example of an antenna.
13 is a partial cross-sectional view when the antenna of FIG. 12 is arranged in a microwave oven.
14 is a partial cross-sectional view when a turntable is arranged in the apparatus of FIG.
FIG. 15 is a front sectional view showing another example of the microwave oven according to the present invention.
16 is a partial cross-sectional view of the microwave oven of FIG.
FIG. 17 is a partial cross-sectional view showing another embodiment of the microwave oven of the present invention.
FIG. 18 is a partial cross-sectional view showing another embodiment of the microwave oven of the present invention.
FIG. 19 is a partial cross-sectional view showing another embodiment of the microwave oven of the present invention.
FIG. 20 is a front sectional view showing a conventional turntable type high-frequency heating apparatus.
FIG. 21 is a perspective view showing a conventional turntable type high-frequency heating device.
FIG. 22 is a front sectional view showing a conventional stirrer type high frequency heating apparatus.
FIG. 23 is a perspective view showing a conventional stirrer type high frequency heating apparatus.
FIG. 24 is a side sectional view showing a conventional rotary antenna type high-frequency heating device.
FIG. 25 is a front sectional view showing a high-frequency heating device having a conventional stirring function.
FIG. 26 is a side cross-sectional view showing a conventional rotating antenna type high-frequency heating device with a heater.
[Explanation of symbols]
1 Heating chamber
2 Magnetron (high frequency generator)
3 Waveguide
4 Antenna
5 Motor
6 Mounting table
7 Turntable (Rotating member)
8 containers
9 Stirring member (rotating member)
S Object to be heated
H heater
11 Opening
12 Cylindrical convex part (heat blocking part)
41 Receiver
42 Radiation part
42a, 42b Radiation part made of nonmagnetic material
42c, 42d Radiation part made of magnetic member
43 First magnet
44 Protection member
45, 46 opening
47 Convex (regulating member)
48 wheels (regulating members)
49 peripheral wall (heat shield)
71 Support
72 tables
73 Second magnet
75 wheels
81 Projection
91 Base
92 Stirring blade
93 Second magnet
94 wheels
96 Through hole
410 wheels
411 Surrounding wall (heat shield)
412 hole (low heat conduction part)
413,414 Magnetic member
415, 418 recess
416, 417 Non-magnetic member

Claims (9)

A heating chamber for heating an object to be heated, a high-frequency generator for generating a high frequency, a waveguide for guiding the high frequency generated by the high-frequency generator to an opening formed in the heating chamber, and a high frequency in the waveguide A rotatable antenna having a receiving portion and a radiating portion, which is supplied to the heating chamber through the opening, a motor for rotating the antenna, and a partition in the heating chamber near the upper portion of the antenna. In addition, in a high-frequency heating device provided with a mounting table made of a dielectric,
Place the rotating member on the mounting table,
A magnet is provided on both the rotating member and the antenna, or a magnet is provided on one side and a magnetic body is provided on the other side.
A high-frequency heating apparatus, wherein the rotating member is rotated in response to the rotation of the antenna by utilizing magnetic coupling between the antenna and the rotating member. The high-frequency heating device according to claim 1, wherein the rotating member is a turntable on which an object to be heated is placed. The high-frequency heating device according to claim 2, wherein the turntable includes a support having a plurality of wheels and magnets, and a table for placing an object to be heated, which is supported by the support. The high-frequency heating device according to claim 3, wherein the table is in contact with and supported by the plurality of wheels and rotates by rotation of the wheels. The high-frequency heating device according to claim 3 or 4, wherein the support is made of metal and has at least one of an opening and a notch for allowing a high-frequency wave radiated from the antenna to pass therethrough. The high-frequency heating device according to claim 1, wherein the rotating member is a stirring member provided in a container disposed on the mounting table. The high-frequency heating device according to claim 6, wherein the stirring member includes a disk-shaped base, a stirring blade formed on the base, and two or more wheels pivoted on a peripheral portion of the base. . A protrusion is provided at the center of the inner bottom surface of the container, a through hole is provided at the center of the stirring member, and the stirring member is attached to the container so that the protrusion is inserted into the through hole. The high-frequency heating device according to claim 6 or 7, wherein the stirring member rotates around the center. The high-frequency heating device according to claim 1, further comprising an electric heater.

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