JP6574983B2 - Cooker - Google Patents

Description

  The present invention relates to a cooking device such as a microwave oven having a grill function for heating food using a microwave and a heater.

  Conventionally, as this kind of heating cooker, the food to be heated is heated using the upper surface heating means for heating from the upper surface and the lower surface heating means for heating from the lower surface simultaneously or separately, respectively. There are some which heat by limiting the heating region (see, for example, Patent Document 1).

  8 is a schematic diagram showing a cross-sectional configuration of a microwave oven as a heating cooker in Patent Document 1, FIG. 9 is a plan view showing a configuration of an upper surface heating means of the microwave oven, and FIG. 10 is a lower heating means of the microwave oven It is a top view which shows the structure of these. Hereinafter, the configuration will be described with reference to FIGS.

  The microwave oven 100 of Patent Document 1 includes left and right upper surface heating means 102 and 103 that heat from the upper surface of a heating chamber 101 that stores food, and two left and right lower surface heating means 105 and 106 embedded in the mounting plate 104, Control means 107 for controlling these heating means 102, 103, 105, 106 is provided.

  And the control means 107 controls the upper surface heating means 102 and 103 and the lower surface heating means 105 and 106, and enables zone heating cooking which heats one part space in the heating chamber 101 separately.

  Advantages of this heating method include simultaneous cooking of a plurality of ingredients by dividing the heating chamber 101 space into zones and shortening the cooking time of small foods.

  However, in the above-described conventional configuration, the mounting plate 104 in which the lower surface heating means 105 and 106 are embedded is detachably disposed in the heating chamber 101, so that the power supply to the lower surface heating means 105 and 106 is electromagnetic. A non-contact power supply configuration is achieved by induction. Specifically, the induction coils 108 and 109 are embedded in the mounting tray 104, and the induction coils 110 and 111 are arranged on the heating chamber 101 wall surface side.

  As described above, when the lower surface heating means 105 and 106 and the induced coils 108 and 109 are embedded in the mounting tray 104, the weight and size of the mounting tray 104 are increased and the usability is deteriorated. In addition, since the number of parts is increased and the cost is increased, it is difficult to adopt it practically.

  In addition, a solution to the above-described heating method of the mounting tray, which was a problem of the microwave oven, by arranging a heating element that absorbs microwaves to generate heat on the mounting tray is widely adopted. There has also been proposed zone heating using a method of heating a mounting plate (see, for example, Patent Document 2).

  FIG. 11 is a schematic diagram showing a cross-sectional configuration of a microwave oven as a heating cooker in Patent Document 2. As shown in FIG. Hereinafter, the configuration will be described with reference to FIG.

The microwave oven 200 of Patent Document 2 includes a mounting tray 203 that is locked so as to divide the heating chamber 201 into upper and lower portions, and on which an object to be heated 202 is mounted, and a plurality of tube heaters that heat the upper surface side of the mounting tray 203. Upper surface heating means comprising 204, 205, 206, and lower surface heating means for heating the lower surface side of the mounting plate 203 (microwave absorption heating element 207, antenna driving unit 208, antenna 209, magnetron 210, waveguide 211); The upper surface heating means, the antenna driving unit 208, and the control means 212 for controlling the magnetron 210 are provided, and the placement portion of the article 202 to be heated is concentrated and heated simultaneously from above and below.

  According to this configuration, since the object to be heated is heated in a short time, cooking time can be shortened and power consumption can be reduced.

JP-A-6-235527 JP 2012-237508 A

  However, since the heating of the microwave absorption heating element described above is greatly affected by the heat generation distribution due to the standing wave of the microwave generated in the heating chamber 201, the mounting dish can be changed even if the distribution can be roughly changed. It is difficult to arbitrarily limit the heating region 203, and the shape of the heating region has not been limited.

  Therefore, as in Patent Document 2, it is difficult to match the heating position when a part of the tube heater is energized with the heating position of the placing plate 203 by microwaves. There were problems such as unevenness in the upper and lower baked colors of the object 202, and burning without being heated more than necessary.

  Moreover, since the tube heaters 204, 205, and 206 are exposed in the heating chamber 201, it takes time and effort to clean the dirt adhering to the inner wall surface of the heating chamber 201 around the tube heaters 204, 205, and 206. Therefore, there was a problem that workability was low.

  The present invention solves the above-mentioned conventional problems, is easy to care for, and shortens and consumes cooking time by making the upper and lower planar heating areas of the upper and lower surface heating means substantially coincide and face each other. It aims at providing the heating cooker which implement | achieves reduction of electric power.

In order to solve the above-described conventional problems, a heating cooker according to the present invention includes a mounting tray on which an object to be heated is mounted, a heating chamber that stores the object to be heated and the mounting plate, and the heating chamber. A locking portion that is formed to face the left and right side walls of the plate and supports the table, the microwave generating means that has microwave radiation directivity and supplies the microwave to the heating chamber, and the table bottom surface A microwave absorption heating element provided on the upper surface of the heating chamber, a central heating element on the center side, and an outer peripheral side of the central heating element and surrounding the central heating element. It was a top heating means having an outer peripheral portion heating elements, switching the central portion heating element and the outer peripheral portion heating element of the top heating means in accordance with the type and quantity of the object to be heated, and the microwave generating means Control means for controlling the output, the control means Enter the power to the central heating element and the microwave output direction of the power input to the outer peripheral portion heating element stops and said microwave generating means to input power to the microwave generating means A function of controlling, stopping power input to the central heating element, inputting power to the outer peripheral heating element, and inputting power to the microwave generating means, The function of controlling the microwave output direction is switched according to the type and quantity of the object to be heated .

  As a result, when heating the mounting dish with microwaves, the plurality of heating elements of the upper surface heating means are selectively energized in accordance with the region where the temperature becomes high, and the heating elements of the selected upper surface heating means are used. By performing heating and placing dish heating with microwaves at the same time, the object to be heated placed in a region that becomes a high temperature of the placing dish is heated intensively from above and below, so that thermal efficiency is good, Cooking in a short time is possible.

Further, since the upper surface heating means is configured to heat the upper surface of the heating chamber, the heating element is not exposed in the heating chamber and can be easily wiped even if dirt adheres to the upper surface of the heating chamber.

  The heating cooker of the present invention is easy to clean and can heat the heated object by matching the heating positions of the upper and lower surface heating means on the plane of the heated object. The cooking device which implement | achieves reduction of can be provided.

External appearance perspective view of the heating cooker in Embodiment 1 of this invention Schematic of the inside of the heating chamber of the same cooking device as seen from the side Schematic view of the inside of the heating chamber of the cooking device as seen from the front Schematic view of the top heating means of the cooking device viewed from above (A) The conceptual diagram for demonstrating the heating method when not limiting the heating area | region in the heating chamber of the heating cooker (b) For demonstrating the heating method at the time of the heating area limitation in the heating chamber of the heating cooker Conceptual diagram (A) The conceptual diagram showing the heating distribution of the mounting plate upper surface when the heating region in the heating chamber of the heating cooker is not limited (b) The upper surface of the mounting plate when the heating region in the heating chamber of the heating cooker is limited Conceptual diagram showing heating distribution Schematic which looked at the upper surface heating means of the heating cooker in Embodiment 2 of this invention from the upper surface The schematic diagram which shows the cross-sectional structure of the microwave oven as the conventional heating cooking appliance in patent document 1 The top view which shows the structure of the upper surface heating means of the microwave oven The top view which shows the structure of the lower stage heating means of the microwave oven The schematic diagram which shows the cross-sectional structure of the microwave oven as a conventional heating cooker in patent document 2

  The first aspect of the present invention is described above, wherein the first tray is formed to face the left and right side walls in the heating chamber, the heating chamber for storing the heating target and the mounting plate, and the left and right side walls of the heating chamber. A locking portion for supporting the table, microwave generation means for supplying microwaves to the heating chamber having microwave radiation directivity, the microwave absorption heating element provided on the lower surface of the table, and An upper surface heating means disposed above the upper surface of the heating chamber and having a plurality of heating elements, and the plurality of heating elements of the upper surface heating means are switched according to the type and quantity of the object to be heated, and the microwave generating means Control means for controlling the output, and the control means switches the plurality of heating elements of the upper surface heating means, controls the microwave output direction of the microwave generation means, and controls the upper surface heating means. Heating area of the plurality of heating elements And the and the heating region before described 置皿 microwave generating means is obtained by adapted to face.

  As a result, the heating position of the mounting plate and the heating position of the upper surface heating means can be matched, so that the heated object can be efficiently heated from above and below, and cooking time and power consumption can be reduced. Become.

  Moreover, since the uneven baking of the up-and-down heating can be reduced, the quality of cooking is also improved.

  Furthermore, since the upper surface heating means is arranged above the upper surface of the heating chamber to heat the upper surface of the heating chamber, there is no exposure of the heating element to the inside of the heating chamber, and the dirt adhering to the wall surface of the heating chamber can be easily wiped off. be able to.

In a second aspect based on the first aspect, the microwave generating means comprises: an antenna that rotates about a rotation axis and radiates the microwave into the heating chamber; and an antenna driving unit that rotates the antenna. And the control means controls the antenna driving section so that the antenna is directed toward the lower surface portion of the table pan corresponding to the lower side of the object to be heated.

  Thereby, in the mounting tray, the microwaves are concentratedly supplied to the lower surface of the region where the object to be heated is placed, and the heating element of the upper surface heating means is formed in the shape of the region to be heated centrally. Since the shape is adapted, cooking time can be further shortened and power consumption can be reduced.

  According to a third invention, in the first or second invention, the upper surface heating means is arranged on the outer peripheral side so as to surround the central heating element on the outer side of the central heating element and the central heating element. An outer peripheral heating element arranged, and the control means selectively energizes the central heating element and the outer heating element.

  Thereby, when heating a division area, uniform heating to a to-be-heated object is realizable by making high the heat_generation | fever density of the heating area | region outer peripheral part which heat dissipation by heat conduction in a heating chamber upper surface increases.

  Also, the radiant heat to the object to be heated is subject to radiant heat because the opposed area of the heating area of the upper surface heating means is the largest at the center, making it more susceptible to radiant heat, and the peripheral area becomes less opposed. It becomes difficult. Therefore, by increasing the heat generation density at the outer peripheral portion of the heating region and increasing the temperature of the outer peripheral portion from the central portion of the heating region, the object to be heated can be heated more uniformly.

  According to a fourth invention, in any one of the first to third inventions, the upper surface heating means has a heat generation density of the outer peripheral heating element higher than that of the central heating element.

  According to the present invention, the same effect as the third invention can be obtained.

  According to a fifth aspect of the invention, in any one of the first to third aspects, the upper surface heating means heats the heat generation density at the corners of the heating region of the outer periphery heating element to a temperature other than the corners of the outer periphery heating element. It is higher than the area.

  Thereby, when heating the heating region, uniform heating of the object to be heated can be realized by increasing the heat generation density at the corners of the heating region where heat dissipation due to heat conduction on the upper surface of the heating chamber is the largest. .

  According to a sixth invention, in any one of the first to third inventions, the upper surface heating means heats the heat generation density of the corner portion of the heating region of the central heating element to a temperature other than the corner portion of the central heating element. It is higher than the area.

  Thereby, when heating the heating region, uniform heating of the object to be heated can be realized by increasing the heat generation density at the corners of the heating region where heat dissipation due to heat conduction on the upper surface of the heating chamber is the largest. .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is an external perspective view of a cooking device 1 according to Embodiment 1 of the present invention.

The cooking device 1 according to the present embodiment supplies at least one of a high frequency (microwave) and radiant heat to a heating chamber 2 having an opening on the front surface and housing the object 7 to be heated. 7 is heated.

  In the present embodiment, the front opening side of the heating chamber 2 is defined as the front, the right side is defined as the right side from the front toward the rear, and the left side is defined as the left side from the front toward the main body. .

  A heating chamber 2 is provided in the main body of the heating cooker 1. A door 3 with a projection window that opens and closes the opening of the heating chamber 2 is installed on the front surface of the main body of the heating cooker 1. The lower end of the door 3 is pivotally supported by a lower end portion of the main body of the heating cooker 1 via a hinge, and is configured to be rotatable in the vertical direction and the front-rear direction. Further, the door 3 constitutes a part of the outline of the heating cooker 1.

  The door 3 is provided with a handle 4, an operation button 5 for inputting information on the heating condition and the object 7 to be heated, and a display unit 6 for displaying the input content, cooking progress, and information on the object to be heated. .

  2 is a schematic view of the inside of the heating chamber 2 of the cooking device 1 as seen from the side, FIG. 3 is a schematic view of the inside of the heating chamber 2 of the cooking device 1 as seen from the front, and FIG. It is the schematic which looked at 19 from the upper surface.

  In the figure, below the heating chamber 2, microwave generation means 8 for supplying microwaves to the heating chamber 2 and heating the article 7 to be heated is provided. The microwave generation means 8 radiates the microwave generated by the magnetron 9 into the heating chamber 2 while being stirred by the antenna 10 which is a microwave stirring means.

  The antenna 10 has direction characteristics with respect to the microwave output direction. The direction characteristic of the antenna 10 is called radiation directivity. The antenna 10 is rotated about an axis of rotation 12 by an antenna driving unit 11 having a motor. In normal heating, the antenna driving unit 11 continuously turns the antenna 10 so as to uniformly heat the object 7 to be heated in the heating chamber 2, that is, so that the microwave distribution in the heating chamber 2 is uniform. It rotates and changes the output direction of the microwave.

  The glass plate 13 is made of crystallized glass and is disposed on the bottom surface of the heating chamber 2. An object to be heated 7 is placed on the glass plate 13 during normal microwave heating.

  The mounting tray 14 is used for grill cooking. The mounting tray 14 has an upper surface on which the object to be heated 7 is mounted and a lower surface that is a surface opposite to the upper surface. A microwave absorption heating element 15 that absorbs microwaves and generates heat is attached to the lower surface of the mounting tray 14.

  When the microwave absorption heating element 15 absorbs the microwave supplied to the heating chamber 2 and generates heat, the generated heat is conducted from the lower surface of the mounting tray 14 to the upper surface and is mounted on the mounting tray 14. The heated object 7 thus heated is heated from below. Therefore, the heat generated by the microwave absorption heating element 15 is used for cooking the pottery using the microwave.

  On the right and left walls of the heating chamber 2, in order to support the mounting tray 14, there are a plurality of engaging portions 16 a, 16 b, 16 c each having a horizontal upper surface in the horizontal direction in the front-rear direction (this embodiment). There are three stages). The locking portions 16a, 16b, and 16c lock the left and right ends of the mounting plate 14 so that the mounting plate 14 can be installed at an optimum position for cooking. The space is divided up and down.

  Upper surface heating means 19 composed of heating elements 18a, 18b divided into two flat aggregates such as mica heaters is provided above the heating chamber upper surface 20 constituting the top plate of the heating chamber 2 (outside the heating chamber 2). It is attached. One assembly is a heating element 18b (outer peripheral heating element), and the heating element 18b is disposed on the outer peripheral side of the central heating element 18a (central heating element) so as to surround the heating element 18a. Yes. The upper surface heating means 19 divides the upper surface 20 of the heating chamber into two parts, a region where the heating element 18a is located and a region where the heating element 18b is located, and energizes the heating elements 18a and 18b individually or simultaneously. The heating chamber upper surface 20 can be selectively heated.

  The upper surface heating means 19 is pressed against the upper surface 20 of the heating chamber by the heat shield plate 22 through the heat insulating material 21. The upper surface heating means 19 is configured to efficiently transfer heat by being in close contact with the upper surface 20 of the heating chamber.

  Thus, the upper surface heating means 19 is not exposed in the heating chamber 2, and the heating elements 18a and 18b are not affected by microwaves, so there is no problem such as spark. Moreover, since the heating chamber upper surface 20 becomes a flat surface, even if food residue or oil adheres, it can be easily wiped off and kept clean.

  As shown in FIG. 4, heating wires 30 and 31 are wound around mica plates 32 and 33 around the heating elements 18a and 18b, respectively. The upper surface heating means 19 is sandwiched between different mica plates (not shown) from the vertical direction.

  The microwave absorption heating element 15 affixed to the lower surface of the mounting tray 14 is compared with a high temperature heat generation region where the temperature distribution due to the generated heat is high when the microwave is absorbed and generates heat, compared with this high temperature region. And a low-temperature heat generating region that is low in temperature.

  The heating element 18a at the center of the upper surface heating means 19 is provided at a position facing the above-described high-temperature heat generation area of the mounting tray 14 with the mounting tray 14 in between. And the heat generating body 18b of the outer peripheral part of the upper surface heating means 19 is provided in the position facing the low temperature heat_generation | fever area | region of the microwave absorption heat generating body 15 of the mounting plate 14 mentioned above on both sides of the mounting plate 14. FIG. .

  In general, a standing wave is formed by the microwave in the heating chamber 2. This is because even if the antenna 10 is rotated and the microwave is stirred, there is a standing wave that changes due to the rotation, and the microwave cannot be made completely uniform.

  In the microwave absorption heating element 15, due to the influence of the standing wave, a portion that generates heat strongly and a portion that generates heat weakly occur, and a temperature distribution is formed. That is, the heating element 18a is attached to a region where the high-temperature heating region of the mounting tray 14 by the microwave absorbing heating element 15 is experimentally obtained in advance and is opposed to the high-temperature heating region.

  When the control means 23 limits the area and efficiently heats the object 7 to be heated, the radiation directivity of the antenna 10 is set in the direction of the lower surface of the mounting plate 14 corresponding to the lower part of the object 7 to be heated. The antenna drive unit 11 is controlled so as to be directed. For example, if the antenna 10 is directed in front of the heating chamber 2, that is, on the side close to the door 3, microwaves can be easily concentrated on the lower surface of the mounting plate 14 in that direction. In addition, heat can be generated. Further, the energization of the upper surface heating means 19 is controlled by energizing only the heating element 18a.

  Thereby, it becomes possible to heat the to-be-heated material 7 mounted in front of the mounting tray 14 intensively.

When the heating area of the mounting tray 14 is limited, which heating area is selected is not limited to the side of the mounting tray 14 close to the door 3, but is far from the heating chamber 2, that is, far from the door 3. It may be the side or the left or right half of the heating chamber 2.

  In addition, a temperature sensor 24 is provided in the upper right upper part in the heating chamber 2. When the temperature sensor 24 detects that the temperature in the heating chamber 2 has exceeded a preset temperature, it outputs a signal to the control means 23. The control means 23 receiving this signal suppresses power supply to the heating elements 18a and 18b and the magnetron 9.

  FIGS. 5A and 5B are conceptual diagrams for explaining the heating control method when the heating region in the heating chamber 2 in FIG. 1 is limited.

  As shown in FIG. 5A, when the heating region is not limited, the antenna 10 is rotated 360 degrees and the microwave is radiated into the heating chamber 2. In this case, the upper surface heating means 19 energizes both the heating elements 18a and 18b. However, normally, due to the limitation of the power supply capacity, the mounting plate 14 heating by the microwave and the operation of the upper surface heating means 19 are alternately switched.

  Thereby, the whole lower surface of the mounting tray 14 is irradiated with microwaves, and the entire mounting tray 14 (the region 40 shown in FIG. 5A) generates heat, and the heating elements 18a and 18b move upward. The entire mounting tray 14 can be radiantly heated.

  As shown in FIG. 2, when the article 7 to be heated is placed in front of the heating chamber 2, that is, on the side close to the door 3 of the placing tray 14, when heating a limited region, FIG. As shown in Fig. 5, only the heating element 18a is energized and the energization to the heating element 18b is stopped.

  At the same time, the antenna 10 is controlled so that the microwave is concentrated on the side close to the door 3 of the mounting tray 14 (the region 41 shown in FIG. 5B) (the antenna 10 is directed to the front of the heating chamber 2). By performing the heating concentrated from the upper surface and the lower surface of the object to be heated 7 at the same time on the placement position of the object to be heated 7, it is possible to perform highly efficient cooking and shorten the cooking time.

  As an effect of simultaneous heating of the specific area in the mounting tray 14, it is possible to efficiently heat the object 7 to be heated rather than separately performing upper surface heating and lower surface heating of the entire area of the mounting tray 14. It is done.

  It is the heating chamber upper surface 20 that radiates radiant heat to the upper surface of the article 7 to be heated, and the heating elements 18a and 18b need to heat the heating chamber upper surface 20 first. Accordingly, since the heat capacity and the thermal resistance increase, there is a limit in increasing the temperature rise rate of the heating chamber upper surface 20.

  If the upper surface heating and the lower surface heating are performed separately, the temperature rise delay due to the upper surface heating is added, so that the cooking time becomes longer. However, even if the electric power is simply divided into two and the upper surface heating and the lower surface heating are performed simultaneously, the watt density of the heating elements 18a and 18b is halved and the rate of temperature increase is slowed. There is also a problem that the temperature necessary for coloring cannot be obtained.

  Next, the shape setting of the heating elements 18a and 18b in FIGS. 5A and 5B will be described.

  6 (a) and 6 (b) are conceptual diagrams showing the heating distribution on the top surface of the mounting tray 14, and FIG. 6 (a) shows the antenna 10 rotated 360 degrees as shown in FIG. 5 (a). 6 (b) shows the temperature distribution of the mounting tray 14 due to microwaves, and FIG. 6 (b) shows that the antenna 10 is placed on the side closer to the door 3 of the mounting tray 14 as shown in FIG. Represents the temperature distribution when control is performed so as to concentrate. The temperature distribution in FIG. 6 indicates that the darker the color, the higher the temperature.

  When the antenna 10 is rotated 360 degrees, as shown in FIG. 6A, the temperature distribution on the upper surface of the mounting plate 14 is agitated by the microwave by the rotation of the antenna 10, and almost the entire surface is heated uniformly. . The broken lines 42, 43, and 44 in FIG. 6 indicate the heat generation areas of the heat generating elements 18a and 18b (FIG. 5) with respect to this area. In this case, the positions of both the heat generating elements 18a and 18b are the same as the heat generation position of the mounting tray 14. It is set to fit.

  When the antenna 10 is controlled to concentrate the microwave on the side close to the door 3 of the mounting tray 14, the temperature distribution on the top surface of the mounting tray 14 is slightly forward (door) as shown in FIG. (3 side) A high temperature region is generated. However, even if the antenna 10 is controlled to concentrate the microwave forward, the microwave cannot be concentrated only forward, but the microwave is relatively easily concentrated forward.

  Moreover, it is difficult to clearly set the high-temperature heat generation region even in the heating region due to the influence of the standing wave generation in the microwave heating chamber 2. Therefore, the relationship between the angle control of the antenna 10 and the high temperature heat generation region is experimentally obtained in advance, and the shape of the heating element 18a (FIG. 5) is set as shown by the broken line 42 in accordance with the generated high temperature heat generation region.

  As described above, when the heating area is limited, the arrangement shape of the heating elements 18a and 18b is set in accordance with the high-temperature heat generation area of the mounting tray 14, so that the object to be heated placed in the high-temperature heat generation area is set. 7 can be efficiently heated from above and below.

  The upper surface heating means 19 is not limited to a mica heater, and a ceramic heater, a sheathed heater, a tube heater, a microwave generating means, and an induction heating means may be used as long as the upper surface 20 of the heating chamber is heated from above. .

  Further, not all of the microwaves from the magnetron 9 are supplied to the lower surface of the mounting tray 14, and a part is supplied to the space above the mounting tray 14. Therefore, the inside of the article to be heated 7 is microwave-heated by the microwave supplied to the space above the mounting tray 14.

  As shown in FIG. 2, the microwave generated from the magnetron 9 is supplied to the antenna 10, and the antenna 10 is driven and controlled to irradiate the place where the heated object 7 is placed on the placing tray 14 in a concentrated manner. Is done.

  By controlling the antenna 10, the microwave absorption heating element 15 near the portion to be heated 7 generates heat due to the microwaves concentrated on the place on which the object 7 to be heated is placed on the placement tray 14. As a result, cooking can be performed such that the lower surface of the object to be heated 7 is colored, and further, the inside of the object 7 to be heated, which is a feature of microwave heating, can be directly heated.

  In addition, by selectively controlling the energization of the heating elements 18a and 18b that radiately heat the heated object 7 from the upper surface by the control means 23, the upper surface of the heated object 7 can be colored efficiently. Thus, shortening of cooking time and good finishing of cooking can be ensured.

  2 to 5, as a method of limiting the heating region from below, the rotation direction and the rotation speed of the antenna 10 are controlled, and when the antenna 10 is directed in the direction of the object to be heated 7 or in the front and back thereof, Compared to other cases, there are methods of slowing the antenna rotation speed or increasing the power to the magnetron 9. Thereby, the calorie | heat amount to the to-be-heated material 7 can be increased, and cooking time can be shortened.

  Further, with respect to the microwave radiation direction of the antenna 10, a certain range (for example, between the direction in which the antenna 10 is directed toward the right end of the door 3 and the direction toward the left end of the door 3) is reciprocated. There are various cases for the method.

  2 and 3, it is necessary to distribute power between the heating elements 18a and 18b as the upper surface heating means 19 and the magnetron 9 within the range of the rated current value.

  As an example, out of the rated allowable power value of 1500 W at 100 V and 15 A, 1300 W is input to the upper surface heating means 19 and the input to the magnetron 9 is stopped when heating the top surface heating of the article 7 to be heated. At this time, the input to the heating elements 18a and 18b of the upper surface heating means 19 is 650 W, respectively.

  When heating the object 7 to be heated on the lower surface, the upper surface heating means 19 is stopped and 1300 W is input to the magnetron 9. When the heating area is limited, 650 W is input to the heating element 18 a of the upper surface heating means 19, and the remaining 650 W is input to the magnetron 9. Then, input to the heating element 18b is stopped.

  As described above, since the input to the heating element 18a is the same in the case of heating with emphasis on upper surface heating and in the case of heating region limitation, the upper surface of the object to be heated 7 placed in the heating region is from the upper surface. Radiant heat will be radiated in an approximately equal amount. Moreover, when the heating area is limited, the lower surface of the mounting tray 14 is also heated by microwaves, and in addition, some microwaves directly heat the object 7 to be heated from the inside, so even with the same power, The article 7 to be heated is heated from above and below and from the inside, and cooking can be completed in a short time.

  Further, control for changing the output of each heating means and control of heating time can be considered depending on the type of the object 7 to be heated. For example, in toast cooking or the like, the output of microwave heating is increased and heated to reduce moisture at the beginning of heating, and then the output of the upper surface heating means 19 is increased so that the surface is firmly baked and baked. it can.

  In this way, when it is desired to further heat the lower surface in the heating process of the article 7 to be heated, the heating element 18a is not energized, only the heating element 18b is energized, and at the same time, the surplus power of the heating element 18a is used. Since the amount of heat generated from the microwave absorption heating element 15 of the mounting tray 14 increases by increasing the microwave output as much as possible within a range not exceeding the rated allowable current value, the lower surface heating of the object 7 to be heated is performed. Is promoted.

  Similarly, when it is desired to further heat the upper surface, surplus power generated by weakening the microwave output is input to the upper surface heating means 19 to increase the output of the upper surface heating and promote the upper surface heating of the article 7 to be heated. The

  Depending on the object to be heated 7, the combination of the heating configurations is changed as described above, and time distribution and input power distribution are performed to improve the finish of the object to be heated 7 and shorten the cooking time. Can be realized at the same time.

  Moreover, in this Embodiment, the shape of the heat generating body 18a is set to the high temperature heat_generation | fever area | region of the mounting plate 14 surface at the time of controlling the antenna 10 to the side near the door 3 of the mounting plate 14 so that a microwave may be concentrated. Although it set together, you may match | combine with the temperature distribution of the mounting tray 14 at the time of rotating the antenna 10 360 degree | times. In this case, a large temperature distribution bias does not occur, but generally, the temperature of the central portion of the mounting tray 14 tends to increase. Therefore, since the arrangement shape of the heating element 18a can be set with the center of the mounting tray 14 as a reference, the shape of the heating elements 18a and 18b can reduce the deviation of front and rear and right and left, and is easy to design.

(Embodiment 2)
Next, the configuration of the upper surface heating means of the heating cooker in Embodiment 2 will be described with reference to the drawings.

  FIG. 7 is a schematic view of the upper surface heating means 50 of the heating cooker according to the second embodiment of the present invention as viewed from the upper surface. In the present embodiment, the same reference numerals are used for the same configurations and functions as those in the first embodiment described above, and detailed description thereof is omitted for points that are not the points of the invention. Moreover, the structure of the whole heating cooker in this Embodiment is the same as that of the structure of the microwave oven 1 shown in FIGS. 1-3, FIG. 5, FIG.

  As shown in FIG. 7, the upper surface heating means 50 of the second embodiment is formed by punching a metal foil such as SUS (stainless steel) as shown in the figure, and sandwiching the upper and lower sides with an insulating plate 51 such as mica and fixing. A heating element 52 (center heating element) is formed on the center side of the upper surface heating means 50, and a heating element 53 (outer periphery heating element) is formed on the outer peripheral side thereof. Then, when a voltage is applied between the terminal a54 and the terminal b55, a current flows through the heating element 52 to generate heat. When a voltage is applied between the terminal a54 and the terminal c56, a current flows through the heating element 53 to generate heat. When current is passed through both the heating element 52 and the heating element 53, the entire heating elements 52 and 53 generate heat.

In the entire heating region 57, the heating element 52 sets the heat generation density of the first central heating element 58 on the outer peripheral side higher than that of the second central heating element 59 on the central side. For example, the heat generation density of the first central heating element 58 is set to 2.5 W / cm ² , and the heat generation density of the second central heating element 59 is set to 1.5 W / cm ² .

The heating element 53 sets the heat generation density of the outer peripheral part of the heating region 60 combined with the heating element 52 to be higher than that of the central part. For example, the heat generation density of the central heating element 52 is set as described above, and the heat generation density of the outer heating element 53 is set to 2.8 W / cm ² .

  As described above, when the heating region 57 or the heating region 60 is heated by setting the heat generation density on the outer peripheral side of the heating region 57 or the heating region 60 to be high, the heat dissipation ratio due to the heat conduction to the upper surface 20 of the heating chamber. By increasing the heat generation density at the outer peripheral portion of the heating region, the temperature decrease at the outer peripheral portion of the heating region can be suppressed, and uniform heating of the article 7 to be heated can be realized.

  Further, the radiant heat to the object 7 to be heated is most likely to receive a large amount of radiant heat since the opposed area of the heating region is the largest on the center side, and the opposed area is reduced in the peripheral part, so that it is difficult to receive the radiant heat. Therefore, the heating object 7 can be heated more uniformly by increasing the heat generation density of the outer peripheral portion of the heating region 57 or the heating region 60 and increasing the temperature of the outer peripheral portion rather than the central portion of the heating region.

  As a method of setting the heat generation density of the outer peripheral portion of the heating region 60 to be high, power control is performed on the heat generating element 53 and the heat generating element 52, and the heat generating element 53 on the central side is connected to the heat generating element 53 on the outer peripheral side. Control for suppressing power supply may be performed.

  In the second embodiment, the heating element 53 and the first central heating element 58, which are the outer peripheral portions of the heating regions 57 and 60, are generally increased in heat generation density, but the corners ( Since the heat dissipation to the upper surface of the heating chamber is the largest at the bent portion), the heating object 7 can be heated more uniformly when the heat generation density at the corner of the heating region is set higher than that at the corner.

As described above, the present invention can be used for a heating cooker such as a microwave oven having an oven function, but with respect to a heating region corresponding to a placement position of an object to be heated, an upper surface heating means,
By heating from the top and bottom surfaces simultaneously by microwave heating and heat generation from the placing plate of the object to be heated, highly efficient heating can be performed, so that not only cooking but also conductive heating from the placing plate, It can be used for heating all objects to be heated that can use internal heating by microwaves and radiation heating from the upper surface heating means.

1 Microwave oven (heating cooker)
2 Heating chamber 7 Object to be heated 8 Microwave generating means 10 Antenna 11 Antenna driving unit 12 Rotating shaft 14 Placement plate 15 Microwave absorption heating element 18a, 52 Heating element (central heating element)
18b, 53 heating element (outer peripheral heating element)
19, 50 Upper surface heating means 20 Heating chamber upper surface 23 Control means

Claims (5)

A mounting tray on which the object to be heated is mounted;
A heating chamber for storing the object to be heated and the tableware,
A locking portion that is formed to face the left and right side walls in the heating chamber and supports the table,
Microwave generation means for supplying microwaves to the heating chamber having a microwave radiation directivity, a microwave absorption heating element provided on the lower surface of the table,
Upper surface heating means disposed above the upper surface of the heating chamber and having a central central heating element and an outer peripheral heating element disposed on the outer peripheral side of the central heating element and surrounding the central heating element. When,
Control means for switching the central heating element and the outer peripheral heating element of the upper surface heating means according to the type and quantity of the object to be heated, and controlling the output of the microwave generating means,
The control means inputs electric power to the central heating element, stops input of electric power to the outer peripheral heating element, and inputs electric power to the microwave generating means. The function of controlling the microwave output direction, the input of electric power to the central heating element is stopped, the electric power is input to the outer peripheral heating element, and the electric power is input to the microwave generating means. A heating cooker that switches the function of controlling the microwave output direction of the microwave generating means according to the type and quantity of the object to be heated . The microwave generating means includes an antenna that rotates about a rotation axis and radiates the microwave into the heating chamber;
An antenna driving unit for rotating the antenna,
The cooking device according to claim 1, wherein the control unit controls the antenna driving unit so as to be directed toward a lower surface portion of the table pan corresponding to the lower side of the object to be heated. The top heating means, pressure heat cooker of claim 1 or 2 heat density of the outer peripheral portion heating element was higher than that of the central portion heating element. The top heating means, to any one of claims 1 to 3 higher than the heat generation density of the corner portion of the heating area of the outer peripheral portion heating element to the heating region other than the corner portion of the outer peripheral portion heating element The cooking device described . The top heating means, in any one of claims 1 to 4 higher than the heat generation density of the corner portion of the heating region of the central portion heating element to the heating region other than the corner portion of the center portion heating element The cooking device described .

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