WO2017154365A1

WO2017154365A1 - Thermal cooking device

Info

Publication number: WO2017154365A1
Application number: PCT/JP2017/001644
Authority: WO
Inventors: 辻本　真佐治; 早川　雄二; 孝彦山崎; 愛宿波
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2016-03-09
Filing date: 2017-01-19
Publication date: 2017-09-14
Also published as: EP3428538A1; EP3428538B1; CN108713124A; HK1255855A1; JP2017161162A; JP6455731B2; EP3428538A4; TW201732199A; CN108713124B; TWI632329B

Abstract

This thermal cooking device comprises: a heating chamber that heats items to be cooked; a planar heater serving as one heat source by using an internal heater and an external heater that surrounds the internal heater, said internal heater being provided above the ceiling wall of the heating chamber and arranged immediately above the center section of the ceiling wall; and a control unit that respectively controls the internal heater and the external heater in the planar heater. The thermal cooking device has a configuration whereby the total maximum heater output of internal heater and the external heater exceeds the rated power of the thermal cooking device. The control unit is configured so as to continuously and variably control the power input to at least either the internal heater or the external heater, such that the total heater output of the internal heater and the external heater does not exceed the rated power of the thermal cooking device.

Description

Cooker

The present disclosure relates to a heating cooker that cooks food that is a food to be cooked in a heating cabinet, and more particularly to a cooking device that heats the food to be cooked by a flat heater provided on the ceiling wall of the heating cabinet.

The heating cooking means in the heating cooker includes an infrared heater unit that directly heats food by radiating heat rays, a microwave heating unit that heats food by irradiating microwaves, a steam heating unit that heats food by steam, heating A hot air circulation unit that heats food by circulating hot air inside the cabinet is used.

Moreover, as a heating cooking means in a heating cooker, there exists a structure which provides a plane heater on the ceiling wall of a rectangular parallelepiped heating chamber, heats the ceiling wall, and indirectly heats the inside of the heating chamber by the ceiling wall. (See Patent Documents 1 and 2).

JP-A-3-103206 JP 2010-54124 A

As described above, the heating cooker is configured such that an appropriate heating cooking means is selected in order to perform optimum heating cooking according to cooking on the food that is to be cooked inside the heating chamber. ing. When cooking using a heating cooker, it is delicious that the inside of the heating cabinet reaches the set cooking temperature (set temperature) in a short time and the set temperature is kept constant for a predetermined time. It is important to make the food, and also important to shorten the cooking time.

In the heating cooker, in the configuration using the flat heater provided on the ceiling wall as the heating cooking means, the ceiling wall is heated so that the inside of the heating chamber becomes the set temperature by the heat radiated from the heated ceiling wall. Heat to. For this reason, it is necessary to efficiently transfer the heat from the flat heater to the inside of the heating chamber. However, since the ceiling wall repeatedly expands and contracts due to the heat of the flat heater, it is difficult to keep the ceiling wall surface and the flat heater in close contact with each other. As a result, a gap (air layer) is generated between the ceiling wall surface and the flat heater, and heat transfer efficiency from the flat heater to the ceiling wall is deteriorated.

Also, the heat source (heater wire) of the flat heater is covered with an electrical insulating member. The heat from the heat source of the flat heater is transmitted to the ceiling wall via the electrical insulating member to heat the ceiling wall, and the inside temperature of the heating chamber is raised to the set temperature by the heat of the heated ceiling wall. Further, in the conventional cooking device, the temperature inside the cooking chamber is detected by the temperature detecting means, and on / off control is performed on the flat heater based on the detected temperature inside the cooking cabinet so that the inside of the heating cabinet becomes the set temperature. It was. In such a conventional heating cooker, if the heating chamber is heated by the flat heater until the internal temperature reaches the set temperature, the flat heater when the internal temperature reaches the set temperature is lower than the set temperature. The temperature is high, and in some cases, the heat resistance temperature of the flat heater may be exceeded. For this reason, in the conventional cooking device, in consideration of safety and reliability, the flat heater is temporarily turned off before the inside temperature reaches the set temperature, and thereafter the flat heater is turned on / off. By repeating the above, the inside temperature was gradually brought close to the set temperature. As described above, in the conventional cooking device, since the flat heater is controlled based on the detected internal temperature and reaches the set temperature, it is difficult to set the temperature accurately and set. It took time to reach the temperature.

In addition, in the conventional cooking device, in order to maintain the internal temperature at the set temperature, the control is repeated on / off operation that simply turns the flat heater on and off, so the internal temperature fluctuates up and down and is constant. It was difficult to maintain the temperature.

Furthermore, for example, in a cooking device used in a general household, the rated power is defined, and there is a problem that the input power is limited. For this reason, the heat source provided in the cooking device must be designed within the rated power. In particular, when a flat heater is used as a heating cooking means, it is difficult to heat and cook by rapidly starting up the inside of the heating chamber with a desired power in consideration of other heating cooking means.

An object of the present disclosure is to construct a heating cooker that can efficiently perform heating cooking using at least a flat heater as a heating cooking means within the rated power, and the temperature inside the heating cabinet rises quickly to a set temperature. And it aims at provision of the heating cooker which can maintain the internal temperature at preset temperature.

A heating cooker according to an aspect of the present disclosure includes a heating chamber that heats an object to be cooked, an inner heater and an inner heater that are provided on a ceiling wall of the heating chamber and are disposed directly above a central portion of the ceiling wall. And a control unit that controls each of the inner heater and the outer heater in the flat heater. The cooking device has a configuration in which the sum of the maximum heater outputs of the inner heater and the outer heater exceeds the rated power of the cooking device. The control unit is configured to variably control the electric power input to at least one of the inner heater and the outer heater so that the sum of the heater outputs of the inner heater and the outer heater does not exceed the rated power of the cooking device. ing.

According to the present disclosure, it is possible to construct a heating cooker having a configuration capable of performing heating cooking with high efficiency by using at least a flat heater as heating cooking means within the rated power.

FIG. 1 is a perspective view showing the appearance of the heating cooker according to the present embodiment. FIG. 2 is a perspective view showing a state where the door is opened in the heating cooker of the present embodiment. FIG. 3 is a perspective view showing a state where the outer cover of the heating cooker of the present embodiment is removed. FIG. 4 is a front view showing the upper side of the heating cooker of the present embodiment in section. FIG. 5 is an exploded perspective view of the flat heater unit in the cooking device of the present embodiment. FIG. 6A is a plan view of a heating upper plate of the flat heater unit in the heating cooker of the present embodiment. 6B is an end view taken along line 6B-6B of FIG. 6A. 6C is an end view taken along line 6C-6C of FIG. 6A. FIG. 7 is an exploded perspective view showing a flat heater in the cooking device of the present embodiment. FIG. 8 is a plan view showing a heater in the cooking device of the present embodiment. FIG. 9 is a plan view of a flat heater in the cooking device of the present embodiment. FIG. 10 is a back view of the flat heater in the cooking device of the present embodiment. FIG. 11 is a perspective view showing a state where the flat heater is mounted on the upper plate of the heating chamber in the cooking device of the present embodiment. FIG. 12A is a plan view of a presser plate in the heating cooker of the present embodiment. 12B is an end view taken along line 12B-12B of FIG. 12A. 12C is an end view taken along line 12C-12C of FIG. 12A. FIG. 13: is sectional drawing explaining the mounting method with respect to the heating upper plate of the press plate in the heating cooker of this embodiment. FIG. 14: is sectional drawing which shows the mounting state with respect to the heating chamber upper board of the pressing plate when the heating chamber upper board becomes high temperature in the heating cooker of this embodiment. FIG. 15 is an enlarged cross-sectional view illustrating a state where the heater temperature detection unit is mounted in the cooking device of the present embodiment. FIG. 16 is a perspective view showing a flat heater unit in the cooking device of the present embodiment. FIG. 17A is a plan view of a flat heater unit in the cooking device of the present embodiment. 17B is a cross-sectional view taken along line 17B-17B of FIG. 17A. FIG. 17C is a cross-sectional view taken along line 17C-17C of FIG. 17A. FIG. 18 is a circuit diagram for controlling the cooking device in the cooking device of the present embodiment. FIG. 19 is a perspective view showing a heating pan used in the heating cooker of the present embodiment. 20 is a plan view of the heating tray shown in FIG.

A heating cooker according to a first aspect of the present disclosure includes a heating chamber that heats an object to be cooked, an inner heater that is provided on a ceiling wall of the heating chamber, and is disposed directly above a central portion of the ceiling wall. A flat heater serving as one heat source by an outer heater surrounding the inner heater, and a control unit for controlling the inner heater and the outer heater in the flat heater, respectively. The cooking device has a configuration in which the sum of the maximum heater outputs of the inner heater and the outer heater exceeds the rated power of the cooking device. The control unit is configured to variably control the electric power input to at least one of the inner heater and the outer heater so that the sum of the heater outputs of the inner heater and the outer heater does not exceed the rated power of the cooking device. ing.

The cooking device according to the first aspect configured as described above can efficiently perform cooking using at least a flat heater as heating cooking means within the rated power, and the inside temperature of the heating cabinet (upper plate) Temperature) rises quickly to the set temperature, and a cooking device capable of maintaining the internal temperature (upper plate temperature) at the set temperature can be provided.

The heating cooker according to the second aspect of the present disclosure may include a heater temperature detector that detects the temperature of the region directly heated by the flat heater according to the first aspect. The control unit may be configured to control the flat heater based on the heater temperature information detected by the heater temperature detector so that the internal temperature of the heating cabinet or the temperature of the ceiling wall is set as the set temperature.

The heating cooker of the third aspect according to the present disclosure may be configured such that the heater output of the inner heater in the first aspect is larger than the heater output of the outer heater.

In the heating cooker according to the fourth aspect of the present disclosure, the ceiling wall of the heating chamber in the first aspect has a three-dimensional curved surface having a concave surface on the heating chamber side, and the entire surface of the flat heater is in close contact with the ceiling wall. It may be fixed as follows.

In the cooking device of the fifth aspect according to the present disclosure, the three-dimensional curved surface of the ceiling wall of the heating chamber in the fourth aspect is rectangular in plan view, and the curvature in the longitudinal direction is different from the curvature in the short direction. It may be configured.

In the cooking device of the sixth aspect according to the present disclosure, the ceiling wall of the heating chamber in the first aspect may have a plurality of regions that absorb the deformation force of expansion / contraction due to the heat of the flat heater.

In the heating cooker according to the seventh aspect of the present disclosure, the ceiling wall of the heating chamber in the first aspect has a plurality of regions that absorb the deformation force of expansion / contraction due to the heat of the flat heater, and the plurality of regions Each may have the same shape.

In the cooking device of the eighth aspect according to the present disclosure, the ceiling wall of the heating chamber in the first aspect has a plurality of polygonal regions that absorb the deformation force of expansion / contraction due to the heat of the flat heater. May be.

In the heating cooker according to the ninth aspect of the present disclosure, the ceiling wall of the heating chamber in the first aspect has a plurality of honeycomb-shaped regions that absorb the deformation force of expansion / contraction due to the heat of the flat heater. Also good.

A cooking device according to a tenth aspect of the present disclosure is the heating cooker according to the first aspect, in which the planar heater has a three-dimensional curved surface attached with a movable range to the ceiling wall via a heat insulating material. The structure hold | maintained may be sufficient.

In the cooking device of the eleventh aspect according to the present disclosure, the pressing plate in the tenth aspect is formed with a pressing portion protruding in the direction of the inner heater and the outer heater in each region facing the inner heater and the outer heater. The inner heater and the outer heater may be pressed by the pressing portion via a heat insulating material.

The cooking device of the twelfth aspect according to the present invention may be configured such that at least the surface on the flat heater side in the ceiling wall of the heating chamber in the first aspect has a black silicon film.

The cooking device of the thirteenth aspect according to the present invention may be configured such that at least the surface of the heating wall side of the ceiling wall of the heating chamber in the first aspect has a self-cleaning film.

Hereinafter, as an embodiment according to the cooking device of the present disclosure, a cooking device using at least a flat heater as a cooking device will be described with reference to the accompanying drawings. Note that the cooking device of the present disclosure is not limited to the configuration of the cooking device described in the following embodiment, and includes the configuration of the cooking device equivalent to the technical idea described in the following embodiment. It is a waste. Embodiment described below shows an example of this indication, and the composition, the function, operation, etc. which are shown in the embodiment are illustrations and do not limit this indication. Among the constituent elements in the following embodiments, constituent elements that are not described in the independent claim indicating the highest concept are described as optional constituent elements.

Hereinafter, the cooking device of the present embodiment according to the present disclosure will be described with reference to the accompanying drawings. FIG. 1 is a perspective view showing the appearance of the heating cooker according to the present embodiment. FIG. 2 is a perspective view showing a state in which the door is opened in the cooking device of the present embodiment of FIG.

As shown in FIGS. 1 and 2, the cooking device is configured such that a front opening of a heating chamber 4 provided inside the main body 1 can be opened and closed by a door 2. A handle 3 is provided at the upper end of the door 2, and the user grips the handle 3 to rotate the door 2 to open and close the front opening of the heating chamber 4 so as to open upward. The inside of the heating chamber 4 is substantially sealed by closing the door 2, and the cooked food to be heated disposed inside the heating chamber 4 is cooked in a substantially sealed state.

As shown in FIG. 1, a setting unit 5 for setting various cooking conditions such as cooking temperature setting and cooking time setting for heating cooking is provided on the front door 2 of the heating cooker. . Moreover, the setting part 5 provided in the front of the heating cooker has a display part etc. which display various cooking conditions, the heating state during heating cooking, etc.

As a heating cooking means in the heating cooker of this embodiment, in addition to a flat heater, a microwave heating unit that irradiates microwaves to heat food, a steam heating unit that heats food by steam, and the inside of the heating chamber 4 A hot air circulation unit that heats food by circulating hot air is used. In the microwave heating unit, an antenna that radiates microwaves is provided below the bottom wall of the heating chamber 4, and the microwave is radiated in a desired direction with respect to the inside of the heating chamber 4 by a directional antenna. It is. The steam heating unit has a water tank inside the main body 1 and has a configuration in which water vapor generated by heating water to a high temperature by a steam heater of a boiler is intensively injected into the inside of the heating chamber 4. The hot air circulation unit is configured to heat the air sucked from the heating chamber 4 by a back heater provided on the back side of the heating chamber 4 and supply hot air to the inside of the heating chamber 4.

In the heating cooker according to the present embodiment, a plurality of heating cooking means are provided, and when the user selects a desired heating cooking means, or when the user selects cooking contents, appropriate heating cooking is performed. The means is selected. The user arranges food to be cooked in the heating chamber 4 of the heating cooker, closes the door 2, sets the heating cooking means, cooking contents, etc. in the setting unit 5, and cooks by pressing the start button. Operation starts.

As shown in FIG. 2, the heating cooker according to the present embodiment is configured so that a heating tray 6 on which an object to be heated is placed can be stored inside the heating chamber 4. The heating tray 6 is slidable on the side walls on both sides of the heating chamber 4 so as to be arranged in the upper, middle, or lower stages inside the heating chamber 4, and supports the heating tray 6. A step that can be formed is formed. A heating element (not shown) is embedded in the mounting surface 33 of the heating tray 6. The heating element absorbs microwaves and generates heat, and ferrite or the like is used.

In this embodiment, an example in which ferrite is embedded in the heating tray 6 as a heating element will be described. However, the heating element only needs to absorb microwaves and generate heat. You may comprise and apply | coat to. Moreover, as a main material of the heating tray 6, what is necessary is just the heat conductivity, and you may comprise with a metal or a ceramic.

Moreover, in this embodiment, although demonstrated by the structure by which the heating tray 6 is supported by the level | step difference of the side wall of the heating chamber 4, the leg | foot which protrudes below is provided in the hanging structure from a ceiling wall, and the heating tray 6. The structure mounted in the bottom wall of the heating chamber 4 may be sufficient.

It should be noted that an antenna (not shown) that radiates microwaves inside the heating chamber 4 is disposed directly below the center of the bottom wall of the heating chamber 4. The antenna according to the present embodiment has directivity in the microwave radiation direction and has a configuration capable of radiating circularly polarized waves directly above the antenna. Therefore, the antenna in the present embodiment is provided with a rotation mechanism so as to radiate microwaves uniformly inside the heating chamber 4, and is configured such that the radiation opening of the antenna rotates. In addition, the antenna in the present embodiment is configured to radiate circularly polarized waves to the heating element of the heating tray 6 disposed immediately above the antenna to perform dielectric heating.

The bottom wall of the heating chamber 4 is formed of a material that allows microwaves from the antenna to pass therethrough, and the side wall, the back wall, and the ceiling wall, which are other wall surfaces in the heating chamber 4, are made of steel or stainless steel ( SUS) aluminized steel sheet is used. Further, a non-adhesive film layer such as a fluororesin or a silicon resin may be formed on each wall surface. By forming such a coating layer, it is possible to prevent adhesion of dirt such as oil and fat scattered during cooking, cooking residue, etc., and even if dirt is attached, the dirt is easily wiped off. Furthermore, on each wall surface of the heating chamber 4, a coating layer having a self-cleaning function may be formed by decomposing oil and fat scattered during cooking by heating during cooking and automatically cleaning. Examples of the method for providing the coating layer with a self-cleaning function include a method in which a manganese oxide-based catalyst species that promotes oxidative decomposition action is added to the coating layer, platinum that exhibits a remarkable effect on oxidative decomposition action at low temperature, or You may use the method of adding palladium etc. with high activity in a medium-high temperature range. Furthermore, a method of adding cerium or the like having an adsorbing action may be used.

As described above, the object to be heated (food) placed on the heating tray 6 housed in the heating chamber 4 is heated to a high temperature by the heat of the heating element dielectrically heated by the microwave. In this embodiment, the upper surface of the object to be heated (food item) placed on the heating tray 6 is heated by the flat heater unit 8 provided on the upper part of the ceiling wall of the heating chamber 4. It has a configuration.

FIG. 3 is a perspective view showing a state where an outer cover is removed from the main body 1 of the heating cooker according to the present embodiment. As shown in FIG. 3, a flat heater unit 8 is provided on the ceiling side of the main body 1 of the heating cooker, that is, on the portion including the ceiling wall of the heating chamber 4. FIG. 4 is a front view showing the upper side of the heating cooker of the present embodiment in section. As shown in FIG. 4, it is shown that the upper portion of the heating chamber 4 in the heating cooker is configured by a flat heater unit 8. As an internal temperature detection means for detecting the internal temperature of the inside of the heating chamber 4, an internal temperature detection unit 9, for example, a thermistor, is provided in the corner portion at the right back of the heating chamber 4. The internal temperature information detected by the internal temperature detection unit 9 is transmitted to the control unit 7 (see FIG. 18) described later, and is used for control in various cooking operations.

[Flat heater unit]
FIG. 5 is an exploded perspective view showing the flat heater unit 8 in an exploded manner. As shown in FIG. 5, the flat heater unit 8 includes, from the lower side in FIG. 5, a heating chamber upper plate 10 that forms the ceiling wall of the heating chamber 4, and a planar heater 11 that is in close contact with the upper surface of the heating chamber upper plate 10. A presser 12 as a backing plate made of mica, a first heat insulating material 13 that blocks heat conduction upward from the flat heater 11, and the flat heater 11 on the heating cabinet upper plate 10. And a presser plate 14 that is pressed via Further, the flat heater unit 8 receives heat from the insulating sheet 15 that electrically insulates the terminal portions 24 (see FIG. 16) and the like of the flat heater 11 and the flat heater unit 8 to the outer cover of the main body 1. There are provided a heat shield plate 16 and a second heat insulating material 17. As described above, the flat heater unit 8 has a stacked assembly structure, and all parts can be replaced during maintenance, so that maintainability is improved. Further, the flat heater unit 8 is provided with a heater temperature detector 18 which is a heater temperature detecting means for detecting the temperature of the heating region directly heated by the flat heater 11. Hereinafter, each component in the flat heater unit 8 will be described in detail.

[Heating plate top]
FIG. 6 is a view showing the heating cabinet upper plate 10 constituting the ceiling wall of the heating cabinet 4 in the flat heater unit 8. FIG. 6A is a plan view of the heating cabinet upper plate 10. 6B is an end view taken along line 6B-6B of the heating chamber upper plate 10 shown in FIG. 6A. 6C is an end view taken along line 6C-6C in the heating chamber upper plate 10 shown in FIG. 6A.

The heating chamber upper plate 10 constitutes the ceiling wall of the heating chamber 4, and the central portion other than the outer peripheral edge of the heating chamber upper plate 10 has a rectangular shape (10a) in plan view. This rectangular shape has a curved surface shape in which the heating chamber side (lower side) is a concave surface, and becomes a heat generating region 10a in which the flat heater 11 is disposed in close contact. The heating chamber 4 of the present embodiment has a rectangular parallelepiped shape with the front side being the longitudinal side, and the heat generating area 10 a covers substantially the entire ceiling wall of the heating chamber 4. A rectangular flat heater 11 corresponding to the shape of the heating chamber 4 is disposed in close contact with the curved heat generating area 10a. For this reason, the substantially entire surface of the heating cabinet upper plate 10 constituting the ceiling wall of the heating cabinet 4 becomes a heating element heated by the flat heater 11.

As shown in the end view of FIG. 6B, the cross section in the longitudinal direction (left-right direction in FIG. 6A) of the heat generating region 10 a in the heating chamber upper plate 10 is configured by a curve. Similarly, as shown in the end view of FIG. 6C, the cross section in the short direction (vertical direction in FIG. 6A) of the heat generating region 10 a in the heating chamber upper plate 10 is also configured with a curve. Therefore, the heat generating area 10a in the heating chamber upper plate 10 has a three-dimensional curved surface having a concave surface on the heating chamber side. In the present embodiment, the curvature of the curve in the longitudinal direction of the heat generating region 10a is different from the curvature of the curve in the short direction of the heat generating region 10a, and the curvature in the longitudinal direction is larger than the curvature in the short direction. However, the present invention is not limited to this, and the curvature in the longitudinal direction of the heat generating region 10a may be smaller than the curvature in the short direction.

As shown in the plan view of FIG. 6A, in the heating chamber upper plate 10, the heating region 10a to which the flat heater 11 is closely attached has a plurality of regular hexagonal (honeycomb-shaped) regions (honeycomb regions) 10b. . In the present embodiment, the boundary of the honeycomb region 10b in the heating chamber upper plate 10 is formed by a groove protruding to the heating chamber side, and each honeycomb region 10b has substantially the same area. The heating cabinet upper plate 10 thus configured is formed by press working.

As described above, the heat generating area 10a in the heating chamber upper plate 10 is formed to have a plurality of honeycomb areas 10b. For this reason, the heat generating region 10a expands due to the heat of the flat heater 11, or contracts when the electric power of the flat heater 11 is cut off, and the deformation forces in all directions of expansion / contraction generated at that time are the respective deformation forces. This is a configuration that can be absorbed in the honeycomb region 10b. Although the heat generating area 10a is heated by the flat heater 11 in close contact, the entire surface of the heat generating area 10a is not uniformly heated by the flat heater 11, and the heat generation distribution in the heat generating area 10a becomes non-uniform. For this reason, there is a possibility that the deformation force of expansion / contraction in the heat generating region 10a will be different in each region. If the top plate of the heating cabinet, which is the ceiling wall of the heating cabinet 4, has a flat shape and there is no area that can absorb the deformation force of expansion / contraction, the ceiling wall is locally heated and deformed unevenly. Distortion, a gap is formed between the heating chamber upper plate and the flat heater so that heat from the flat heater is difficult to be transmitted.

In the heating cooker of the present embodiment, a plurality of regions (honeycomb regions) 10b divided by grooves are formed in the heat generating region 10a of the heating chamber upper plate 10. For this reason, the deformation force of expansion / contraction is dispersed and absorbed for each of these honeycomb regions, and as the ceiling wall, the heat generation region 10a is not greatly deformed and distorted locally, and the curved surface whose concave side is the heating chamber side The shape is in a state where it rises smoothly as a whole. As a result, the heat generating region 10a is kept in close contact with the flat heater 11, and heat from the flat heater 11 can be received efficiently and reliably.

As described above, in the present embodiment, the heat generation area 10a in the heating chamber upper plate 10 is prevented from being locally deformed, and the heat generation area 10a is generally lifted while maintaining the same shape as a whole. Therefore, the state in which the flat heater 11 is in close contact with the heat generating region 10a is reliably maintained.

In the present embodiment, the heat generating area 10a in the heating chamber upper plate 10 has been described as being divided by a plurality of regular hexagonal (honeycomb-shaped) honeycomb areas 10b. However, the area 10b is specified to have a honeycomb shape. Instead, it is only necessary to be constituted by a plurality of regions that can disperse and absorb the local expansion / contraction deformation force in the heat generation region 10a. The plurality of regions that absorb the expansion / contraction deformation force may be a polygonal region such as a triangle or a square, or a region formed of a curve.

In the heating chamber upper plate 10 in the present embodiment, a pressing plate locking portion 10c for mounting a pressing plate 14 described later so as to be freely movable in the vertical direction is provided at a substantially center of the heating chamber upper plate 10. A presser plate 14 is attached to the presser plate locking portion 10c by screwing a stepped screw as the locking tool 19. In addition, a plurality of fasteners 10d for closely attaching the flat heater 11 are projected from the heating chamber upper plate 10. The fastener 10d is a small piece that protrudes upward from the upper surface of the heat generating area 10a, and a plate that can be bent is fixed to the upper surface of the heat generating area 10a.

The heating chamber upper plate 10 in this embodiment is made of an aluminum-plated steel plate of steel or stainless steel (SUS). Black film bodies made of, for example, silicon resin are formed on both surfaces of the heating chamber upper plate 10. By forming the black film body on the surface on the flat heater side as described above, the heat from the flat heater 11 can be efficiently absorbed. In addition, in this embodiment, the coating layer which has the self-cleaning function which decomposes | disassembles the fats and oils scattered at the time of cooking by the heating at the time of cooking on the surface at the side of the heating chamber upper plate 10 and cleaning automatically. Is formed. Since the method for forming the coating layer having the self-cleaning function has been described above, it is omitted here. In the present embodiment, a coating layer having a self-cleaning function is also formed on both side walls and the back wall of the heating chamber 4.

[Plane heater]
FIG. 7 is an exploded perspective view showing the flat heater 11 that is mounted in close contact with the heat generating area 10 a of the heating cabinet upper plate 10. As shown in FIG. 7, the heater 25 which is a heat source in the planar heater 11 is divided into an inner heater (inner heater) 20 and an outer heater (outer heater) 21. FIG. 8 is a plan view showing a heater 25 composed of an inner heater 20 and an outer heater 21 which are heat sources. The inner heater 20 and the outer heater 21 are disposed on substantially the same plane, the outer heater 21 is disposed so as to surround the inner heater 20, and each is individually driven and controlled. In the present embodiment, the inner heater 20 is variably controlled steplessly in the range of 300 W to 900 W, and the outer heater 21 is configured to be on / off controlled at 700 W.

The inner heater 20 and the outer heater 21 are formed by winding a heater wire around mica, which is an insulating plate, and the heater output per unit area is set to 1. 6 times larger. In the present embodiment, for example, a heater output of 3.0 W / cm ² (inner heater) is possible. In the present embodiment, a strip heater wire having a thickness of 0.144 mm is used as the heater wire of the inner heater 20, and a strip heater wire having a thickness of 0.10 mm is used as the heater wire of the outer heater 21. By forming the heater wire by winding it at a high density, the temperature rise of the heating cabinet upper plate 10 can be made uniform.

As shown in FIG. 7, the flat heater 11 includes a heater 25 configured as one heat source by the inner heater 20 and the outer heater 21 from both sides by two mica plate members of an upper insulating material 22 and a lower insulating material 23. It is formed between. FIG. 9 is a plan view of the flat heater 11 and shows the upper insulating material 22. FIG. 10 is a rear view of the flat heater 11 and shows the lower insulating material 23.

As shown in FIGS. 9 and 10, in the upper insulating material 22 and the lower insulating material 23, the region where the heater wires of the inner heater 20 and the outer heater 21 are sandwiched is divided by

slits

22 a and 23 a. Yes. Therefore, in the mutual area | region in the upper side insulating material 22 and the lower side insulating material 23 heated with each heater wire of the inner side heater 20 and the outer side heater 21, it is the structure by which the heat transfer from another area | region is interrupted | blocked. The effect of dividing by the

slits

22a and 23a is that when the inner heater 20 and the outer heater 21 are energized at the same time, they expand each other, so that the adhesion of the heating chamber upper plate 10 can be prevented from being impaired. A presser plate locking portion 10c and a plurality of fasteners 10d provided on the heating chamber upper plate 10 are inserted into each of the upper insulating material 22 and the lower insulating material 23 sandwiching the heater 25.

Openings

22b and 23b are formed. The planar heater 11 has a terminal portion 24, and terminals connected to the heater wires of the inner heater 20 and the outer heater 21 are provided on the terminal portion 24.

FIG. 11 is a perspective view showing a state in which the flat heater 11 is mounted on the upper surface of the heating cabinet upper plate 10 described above. As shown in FIG. 11, the flat heater 11 is mounted in close contact with the curved heat generation area 10 a of the heating chamber upper plate 10. The fastener 10d formed on the heating cabinet upper plate 10 is bent, and the flat heater 11 is attached in close contact with a predetermined position on the heat generating area 10a. At this time, the fastener 10d of the heating cabinet upper plate 10 has openings (22b, 23b) formed so as to penetrate the flat heater 11 up and down, and a hole of the presser 12 serving as a backing plate formed of mica. The flat heater 11 is mounted so as to be in close contact with the upper surface of the heat generating region 10a. Further, the presser plate locking portion 10c provided in the center of the heating chamber upper plate 10 is disposed in an opening (22b, 23b) formed in the center of the flat heater 11.

[First insulation]
As shown in FIG. 5, the first heat insulating material 13 is disposed so as to cover the flat heater 11. The 1st heat insulating material 13 has a function which interrupts | blocks the heat from the upper surface of the flat heater 11, and is formed, for example with glass wool. The first heat insulating material 13 has a shape that can cover at least the entire surface of the heating region 10a in the heating chamber upper plate 10, has substantially the same thickness, and has an elastic force (restoring force) at least in the thickness direction. Have.

As shown in FIG. 5 described above, the first heat insulating material 13 has a plurality of openings. The opening formed in the center of the first heat insulating material 13 is an engaging portion opening 13a in which a presser plate engaging portion 10c protruding from the heating chamber upper plate 10 is accommodated. Further, the first heat insulating material 13 includes a fastener opening 13b in which a fastener 10d provided on the heating chamber upper plate 10 is accommodated, a terminal opening 13c through which the heater wire of the flat heater 11 passes, and a flat heater described later. 11 includes a temperature detection opening 13d in which a detection end portion 18a (see FIG. 15) of a heater temperature detection unit 18 serving as a heater temperature detection means for detecting the temperature of a heating region directly heated by 11 is housed.

[Presser plate]
FIG. 12 is a view showing the presser plate 14 that covers the upper portion of the first heat insulating material 13 and is attached to the heating chamber upper plate 10. FIG. 12A is a plan view of the presser plate 14. 12B is an end view taken along the line 12B-12B of the presser plate 14 shown in FIG. 12A. 12C is an end view taken along line 12C-12C of the presser plate 14 shown in FIG. 12A.

As shown in FIG. 12, the holding plate 14 attached to the heating chamber upper plate 10 has a curved surface region 14 a having a curved surface similar to the heat generation region 10 a formed by the curved surface of the heating chamber upper plate 10. . The holding plate 14 has a function of pressing the flat heater 11 against the heat generating area 10a of the heating chamber upper plate 10 via the first heat insulating material 13, and the entire surface of the flat heater 11 is in close contact with the heat generating area 10a without any gap. I am letting. In the pressing plate 14, a pressing portion 14 b is formed at a position facing the inner heater 20 and the outer heater 21 of the flat heater 11. The pressing portion 14 b is formed by a continuous convex portion that protrudes toward the flat heater 11, and presses the inner heater 20 and the outer heater 21 of the flat heater 11 through the first heat insulating material 13. Moreover, since the press part 14b is formed in the presser plate 14 as mentioned above, the rigidity as the presser plate 14 is improved. Moreover, if there exists a part with bad adhesiveness, it can aim at improvement by providing the press part 14b in that part, and can aim at the uniform temperature rise of the heating chamber upper board 10. FIG.

As shown in the end view of FIG. 12B, the cross section in the longitudinal direction (the left-right direction of FIG. 12A) of the curved surface region 14a of the presser plate 14 is substantially composed of a curve. Similarly, as shown in the end view of FIG. 12C, the cross section of the curved surface area 14a of the presser plate 14 in the short direction (vertical direction in FIG. 12A) is also substantially curved. Therefore, the curved surface area 14a in the presser plate 14 has a three-dimensional curved surface in which the heating chamber side (lower side) is a concave surface. In the present embodiment, the curvature of the curved surface area 14a in the longitudinal direction is different from the curvature of the curved surface area 14a in the short direction, and the curvature in the longitudinal direction is smaller than the curvature in the short direction. . However, the present invention is not limited to this, and the curvature in the longitudinal direction of the curved region 14a may be larger than the curvature in the short direction. As described above, the curved surface region 14 a of the presser plate 14 has a curved surface similar to the heat generating region 10 a of the heating chamber upper plate 10.

Further, as shown in FIG. 12A, at the center of the presser plate 14, a locking tool (stepped screw) 19 for screwing the presser plate locking portion 10 c protruding from the heating chamber upper plate 10 is provided. A locking portion mounting hole 14c through which the screw portion 19c (see FIG. 13) passes is formed.

In FIG. 13, a stepped screw 19, which is a locking tool, is screwed to the presser plate locking portion 10 c of the heating cabinet upper plate 10, so that the presser plate 14 can move freely with respect to the heating cabinet upper plate 10. It is sectional drawing explaining the mounting method. 13A shows a state in the middle of screwing the stepped screw 19 into the presser plate locking portion 10c, and FIG. 13B shows the stepped screw 19 screwed into the presser plate locking portion 10c. It shows the state of being worn and assembled. As shown in FIG. 13, the stepped screw 19 includes a head portion 19a, a cylindrical portion 19b, and a screw portion 19c. The diameter of the cylindrical portion 19b is larger than the diameter of the screw portion 19c. Yes.

As shown in FIG. 13 (a), the head 19a of the stepped screw 19 is in contact with the presser plate 14 while the stepped screw 19 is being screwed into the presser plate locking portion 10c. In the configuration of this embodiment, as shown in FIG. 13A, after the head portion 19a of the stepped screw 19 abuts against the presser plate 14, it is screwed by a predetermined pitch, and the cylindrical portion of the stepped screw 19 is provided. 19b comes into contact with the presser plate locking portion 10c of the heating chamber upper plate 10, and the screwing of the stepped screw 19 to the presser plate locking portion 10c is completed to complete the assembly.

FIG. 14 shows a state in which when the heating cooker is used and the heat generating area 10a of the heating cabinet upper plate 10 is heated by the flat heater 11 to a high temperature, the heat generating area 10a expands and rises. Yes. As shown in FIG. 14, even if the heat generating area 10 a expands and rises, the cylindrical portion 19 b of the stepped screw 19 can slide upward in the locking portion mounting hole 14 c of the presser plate 14. For this reason, even if the heat generating area 10a expands and rises, the presser plate 14 does not lift up in the same manner, and the flat heater 11 is always pressed against the heat generating area 10a by the presser plate 14 at a predetermined pressure or higher. State is maintained. Thus, in the heating cooker of this embodiment, since the flat heater 11 is always pressed against the heat generating area 10a by the presser plate 14, the flat heater 11 is spaced from the heat generating area 10a in the cooking operation. The state of close contact is maintained.

As shown in the plan view of the presser plate 14 in FIG. 12A, the presser plate 14 is provided with a temperature detection mounting portion 14d and a terminal mounting portion 14e. The temperature detection mounting part 14d is a part where a heater temperature detection part 18, for example, a thermistor, which detects the temperature of the region directly heated by the heat from the flat heater 11 is mounted. The terminal mounting portion 14e is mounted with a terminal portion 24 having respective terminals of the inner heater 20 and the outer heater 21 in the flat heater 11. Each terminal of the terminal unit 24 is connected to a power supply unit that is driven and controlled by the control unit 7 in the cooking device.

FIG. 15 is an enlarged cross-sectional view showing a state in which the heater temperature detection unit 18 (thermistor) is mounted on the temperature detection mounting unit 14d of the presser plate 14. Note that the cross-sectional view shown in FIG. 15 is an enlarged view of the region indicated by the symbol XV in FIG. 4 described above. As shown in FIG. 15, the detection end 18 a of the heater temperature detection unit 18 is disposed inside a temperature detection opening 13 d formed in the first heat insulating material 13. The temperature detection opening 13 d forms a heating region (heating space) that is directly heated by the flat heater 11. Therefore, the detection end 18 a of the heater temperature detection unit 18 is disposed in a heating region (heating space) that is directly heated by the flat heater 11. In the present embodiment, the heating region (heating space) is formed immediately above the inner heater 20 in the flat heater 11 and is heated directly by the inner heater 20. The heater temperature detection unit 18 detects the temperature of the heating region directly heated by the inner heater 20, so that the heater temperature information and the internal temperature detection unit 9 that detects the temperature inside the heating chamber 4 are detected. Based on the inside temperature information, the control unit 7 drives and controls the heat sources of various heating cooking means used in the cooking device such as the flat heater 11.

FIG. 16 is a perspective view showing the flat heater unit 8 in which the flat heater 11, the first heat insulating material 13, the presser plate 14 and the like are mounted on the above-described heating chamber upper plate 10. FIG. As shown in FIG. 16, the flat heater unit 8 is provided with a presser plate 14 so as to cover the heat generating area 10 a of the heating chamber upper plate 10.

FIG. 17 is a view showing the flat heater unit 8. FIG. 17A is a plan view of the flat heater unit 8. FIG. 17B is a cross-sectional view taken along line 17B-17B in the flat heater unit 8 shown in FIG. 17A. FIG. 17C is a sectional view taken along line 17C-17C in the flat heater unit 8 shown in FIG. 17A.

As shown in FIG. 17, the planar heater unit 8 is configured to be substantially integrated, and the planar heater unit 8 constitutes the ceiling wall of the heating chamber 4. As shown in the cross-sectional view of FIG. 17B, the cross section of the flat heater unit 8 in the longitudinal direction (left-right direction in FIG. 17A) is formed of a curved surface having substantially the same thickness (length in the vertical direction). Similarly, as shown in the cross-sectional view of FIG. 17C, the cross section of the flat heater unit 8 in the short direction (vertical direction in FIG. 17A) is also configured by a curved surface having substantially the same thickness (length in the vertical direction). ing. Therefore, the flat heater unit 8 has a three-dimensional curved surface having a concave surface on the heating chamber side (lower side) as a whole. In the cross-sectional view shown in FIG. 17B, the region surrounded by the symbol A indicates a portion where the stepped screw 19 which is the locking tool shown in FIGS. 13 and 14 is screwed.

[Heating control]
In the cooking device of the present embodiment, as another heating cooking means of the flat heater unit 8 configured as described above, a magnetron that forms a microwave is provided, and the microwave formed by the magnetron is used as a waveguide. A microwave heating unit radiating from the antenna is provided. The antenna that radiates microwaves to the heating chamber 4 is disposed below the bottom wall of the heating chamber 4 and has a configuration that radiates microwaves such as circularly polarized waves from below to the heating chamber 4. Yes. The antenna has a configuration capable of radiating directional microwaves, and can rotate the inside of the heating chamber 4 uniformly by rotating the antenna.

In addition, as other heating cooking means in the heating cooker of the present embodiment, a steam heating unit that intensively jets steam into the heating chamber and cooks and cooks food by circulating hot air inside the heating chamber 4 A hot air circulation unit is provided for cooking the food. The steam heating unit has a water tank inside the main body 1 and has a configuration in which water vapor generated by heating water to a high temperature by a steam heater of a boiler is intensively injected into the inside of the heating chamber 4. The hot air circulation unit is configured to heat the air sucked from the heating chamber 4 by a back heater provided on the back side of the heating chamber 4 and supply hot air to the inside of the heating chamber 4.

As described above, as the heating cooking means in the heating cooker of the present embodiment, the flat heater unit 8, the microwave heating unit, the steam heating unit, and the hot air circulation unit are provided, and each heating is performed according to the cooking content. A cooking unit is selected, and in some cases, a plurality of heating cooking units are driven or controlled simultaneously or in combination. In the present embodiment, heating control by the flat heater unit 8 will be mainly described.

As shown in FIG. 15, the detection end 18 a of the heater temperature detection unit 18 is accommodated in the temperature detection opening 13 d formed in the first heat insulating material 13, and is detected by the heater temperature detection unit 18. The end portion 18 a is disposed in a heating region (heating space) that is directly heated by the inner heater 20 of the flat heater 11. The heater temperature detector 18 detects the temperature of the space directly heated by the inner heater 20, and transmits the detected temperature to the controller 7 (see FIG. 18) as heater temperature information. In the control unit 7, the heating cooking operation is performed according to the cooking content set by the user, based on the inside temperature information from the inside temperature detecting unit 9 that detects the inside temperature of the heating compartment 4 together with the heater temperature information. The heat source and drive source in the are controlled.

In the present embodiment, since the heater temperature detection unit 18 is configured to detect the temperature of the heating region (heating space) that is directly heated by the inner heater 20, the control unit 7 detects the temperature from the heater temperature detection unit 18. Based on accurate heater temperature information, temperature control in the cooking operation by the inner heater 20 can be performed. In the present embodiment, as will be described later, since the speed heating operation for rapidly increasing the temperature of the heating chamber 4 by the inner heater 20 having a large heater output is performed, the heater temperature information is effective in this speed heating operation. .

As described above in the section of “Summary of the Invention”, in the conventional cooking device, on / off control for the flat heater is performed based on the detected internal temperature so that the inside of the heating chamber becomes the set temperature. It was a configuration to do. For this reason, in a conventional cooking device, the temperature inside the chamber is temporarily turned off before the inside temperature reaches the set temperature, and thereafter the on-off operation of the planar heater is repeated until the inside temperature is reached. Was gradually brought closer to the set temperature. Therefore, it is difficult to accurately set the internal temperature to the set temperature using the flat heater, and it takes time to reach the set temperature.

In the cooking device of the present embodiment, the control unit 7 performs temperature control in the cooking operation based on the heater temperature information and the internal temperature information from the heater temperature detection unit 18. In particular, in the speed heating operation in which the temperature of the heating chamber 4 is rapidly increased to reach the set temperature in a short time, the control operation is performed based on the heater temperature information indicating the temperature of the heating region heated by the inner heater 20. It is a structure to be called. For this reason, the control unit 7 can rapidly heat the temperature of the heating region heated by the inner heater 20 to the set temperature, and can rapidly increase the temperature inside the heating chamber 4. . Further, as will be described later, the inner heater 20 in the present embodiment is configured to control the input current to a desired value, and the heater output can be set to a desired value. For this reason, in the control part 7, after the internal temperature reaches the set temperature, the internal temperature is accurately determined by performing input current control on the inner heater 20 based on the internal temperature information and the heater temperature information. It becomes possible to maintain a high set temperature. As a result, in the cooking device of the present embodiment, it is possible to significantly reduce the time until the inside temperature reaches the set temperature, and to maintain the inside temperature at the set temperature with high accuracy for a predetermined time. It becomes possible.

[Cooking operation]
FIG. 18 is a part of a circuit diagram for controlling the cooking device in the cooking device of the present embodiment. As heat sources in the heating cooking means in the heating cooker of the present embodiment, the inner heater 20 and the outer heater 21 in the flat heater unit 8, the steam heater 26 in the steam heating unit, the back heater 27 in the hot air circulation unit, and the microwave heating unit There is a magnetron 28 (see FIG. 18). In the hot air circulation unit, a circulation fan motor 29 is used.

As shown in the circuit diagram of FIG. 18, the inner heater 20, the outer heater 21, the steam heater 26, the back heater 27, and the circulation fan motor 29 are connected to corresponding switching elements so as to be on / off controlled. Moreover, the magnetron 28 which is a microwave generation means in the microwave heating unit is connected to an inverter circuit which is a driving power source. In the present embodiment, the triac 30 is used as a switching element for driving control of the inner heater 20, and the current input to the inner heater 20 can be variably controlled to a desired value steplessly. The outer heater 21 uses a relay 31 as a switching element that simply switches on / off. The outer heater 21 in the present embodiment will be described with a configuration using the relay 31 as a switching element for simply switching on / off. However, like the inner heater 20, the input power is continuously stepped using a triac as a switching element. It may be configured to be variably controllable.

In the cooking device, there is a predetermined rated power, and it is not possible to use power that exceeds the rated power. In the heating cooker of this embodiment, it is the structure which can be cooked using a some heating cooking means, and is controlled in the control part 7 so that power consumptions, such as a heat source to start, are always less than rated power. . In particular, the planar heater unit 8 in the heating cooker of the present embodiment performs characteristic control.

The heater 25 in the flat heater unit 8 constitutes one heat source by the inner heater 20 and the outer heater 21. However, in this embodiment, the maximum heater output of the inner heater 20 is 900 W, for example. The maximum heater output is 700 W, for example. Therefore, the sum of the maximum heater outputs of the inner heater 20 and the outer heater 21 exceeds the rated power in a general home (1500 W = 15 A (rated current) × 100 V). In the heating cooker according to the present embodiment, as shown in FIG. 18, the inner heater 20 is driven and controlled by the triac 30 as a switching element. For this reason, the inner heater 20 can be driven with a heater output that can be changed steplessly within a range of 300 to 900 W by a control signal input to the triac 30.

Hereinafter, a specific cooking operation using the cooking means in the cooking device of the present embodiment will be described with reference to examples.

When cooking the heating chamber 4 using only the flat heater unit 8 and heating the substantially entire surface of the ceiling wall as a heating element, for example, the inner heater 20 of the flat heater 11 is driven and controlled to a heater output of 700 W, and the outer heater 21 is controlled. By turning on the heater output of 700 W, the heating chamber 4 can be heated by the heater output of 1400 W in total as the flat heater 11.

In the case of cooking by heating from the lower side of the ceiling wall surface and the bottom wall to the heating chamber 4 using the flat heater unit 8 and the microwave heating unit, for example, the inner heater 20 of the flat heater 11 is set to 900 W. With the maximum heater output, the outer heater 21 is turned off (0 W), and the heating chamber 4 is heated from above by the heater output of 900 W in total as the flat heater 11. On the other hand, in the microwave heating unit used as another heating cooking means, for example, 450 W is used as the power consumption of the magnetron 28 or the like to heat the heating tray 6 stored in the heating chamber 4, and to the heating tray 6. The placed food can be cooked by heating.

As another example, the outer heater 21 is turned off (0 W), the inner heater 20 is set to a heater output of 430 W, and 550 W is used as the power consumption of the magnetron 28 or the like in the microwave heating unit. The cooked food can be cooked. As described above, even when cooking is performed using the flat heater unit 8 and the microwave heating unit, the power consumption is less than the rated power (1500 W = 15 A (rated current) × 100 V) in a general home. A desired cooking operation can be executed.

In the heating cooker of this embodiment, the central heating of the heating chamber 4 can be intensively heated by using the flat heater unit 8 and the microwave heating unit. In the flat heater 11, the heater output per unit area is increased 1.6 times by setting the heater output, which was 650W in the past, to 900W. In particular, the inner heater 20 has a higher heater output than the outer heater 21. Therefore, in the configuration of the present embodiment, since the central portion of the ceiling wall surface of the heating chamber 4 can be rapidly heated by the inner heater 20 having a large heater output, the central portion of the ceiling wall surface becomes a heating element. Can radiate heat intensively to the central portion of the heating chamber 4. Moreover, the temperature rise of the heating chamber upper plate 10 can be made uniform by forming the heater wires by winding them at high density.

On the other hand, the configuration of the present embodiment has a configuration in which microwaves (circularly polarized waves) can be radiated in a concentrated manner from the bottom of the heating chamber 4 toward the central portion of the heating chamber 4 from the antenna of the microwave heating unit. ing. A heating tray 6 on which food to be heated is placed is housed in the heating chamber 4, and a heating element that absorbs microwaves and generates heat is embedded in the placement surface 33 of the heating tray 6. Has been. As a result, the food on the mounting surface of the heating tray 6 is heated from below by the heating tray 6 heated by the heating element by the microwave heating unit, and the ceiling heater unit 8 The central part is heated and receives heat radiation from the central part from above to be heated intensively. That is, in the cooking device of the present embodiment, the food in the heating tray 6 stored in the heating chamber 4 can be rapidly heated at a high temperature from above and below.

FIG. 19 is a perspective view showing the heating pan 6 used in the heating cooker of the present embodiment. FIG. 20 is a plan view of the heating tray 6 shown in FIG. As shown in FIG. 19 and FIG. 20, the plan view has a rectangular shape, and the outer edge portion 34 has a flange shape spreading outward. A central portion surrounded by the outer edge portion 34 has a concave shape, and a bottom surface thereof serves as a placement surface 33. The mounting surface 33 has an uneven shape. In the uneven shape on the mounting surface 33, valleys and ridges that are inclined with respect to the horizontal direction of the mounting surface 33 (the horizontal direction of the cooking device) are alternately formed. In the present embodiment, the oblique valley and peak are extended at an angle of approximately 45 degrees with respect to the left-right direction.

Further, a region boundary mark 32 indicating a rectangular shape is provided at the center portion of the mounting surface 33 of the heating tray 6. The inside of the region boundary mark 32 is a speed heating region B, and the cooking is performed by intensive speed heating with respect to an object to be cooked by using the microwave heating by the inner heater 20 and the microwave heating unit of the flat heater unit 8 described above. Indicates the area. Accordingly, the user can place food to be cooked on the speed heating region B inside the region boundary mark 32 in the heating tray 6 and cook by speed heating. The region boundary mark 32 may have a convex shape, a concave shape, or a configuration that can be easily confirmed visually and tactilely by printing or the like.

As described above, the cooking device of the present embodiment has a configuration in which cooking can be performed efficiently using at least a flat heater as heating cooking means within the rated power. In the heating cooker of the present embodiment, it is possible to rapidly heat and cook the interior of the heating chamber with a desired high heating power by using a plurality of power devices whose total power consumption exceeds the rated power. It has a configuration.

In addition, the heating cooker of the present embodiment has a configuration that allows the rise of the internal temperature to be quickened and at the same time maintain the internal temperature (heating plate upper plate temperature) at a constant temperature. The cooking device of the present embodiment can accurately set the internal temperature (heating plate upper plate temperature) to the set temperature and shorten the time until the internal temperature reaches the set temperature. It becomes the structure which can achieve shortening of time.

The cooking device according to the present disclosure has a configuration capable of quickly raising the internal temperature to a desired temperature, can shorten the cooking time, and becomes a cooking device with high market value.

DESCRIPTION OF SYMBOLS 1 Main body 2 Door 3 Handle 4 Heating cabinet 5 Setting part 6 Heating pan 7 Control part 8 Planar heater unit 9 Inside temperature detection part 10 Heating cabinet upper plate (ceiling wall)
DESCRIPTION OF SYMBOLS 10a Heat generating area 10b Honeycomb area 10c Holding plate latching part 10d Fastening element 11 Flat heater 12 Pressing tool 13 First heat insulating material 14 Holding plate 15 Insulating sheet 16 Heat insulating plate 17 Second heat insulating material 18 Heater temperature detection part (thermistor)
18a Detection end 19 Locking tool (Stepped screw)
DESCRIPTION OF SYMBOLS 20 Inner heater 21 Outer heater 22 Upper insulating material 23 Lower insulating material 24 Terminal part 25 Heater 26 Steam heater 27 Rear heater 28 Magnetron 29 Circulating fan motor 30 Triac 31 Relay 32 Area | region boundary mark 33 Mounting surface 34 Outer edge part

Claims

A heating chamber for heating the cooking object;
An inner heater provided on the ceiling wall of the heating cabinet and disposed immediately above a central portion of the ceiling wall; and a planar heater serving as one heat source by an outer heater surrounding the inner heater;
A controller for controlling the inner heater and the outer heater in the flat heater, respectively,
The sum of the maximum heater outputs of the inner heater and the outer heater exceeds the rated power of the cooking device,
The control unit continuously outputs power to be input to at least one of the inner heater and the outer heater so that the sum of the heater outputs of the inner heater and the outer heater does not exceed the rated power of the heating cooker. A cooker configured to be variably controlled.
A heater temperature detector for detecting the temperature of the area directly heated by the flat heater,
The control unit is configured to control the flat heater based on heater temperature information detected by the heater temperature detector so that a temperature inside the heating cabinet or a temperature of the ceiling wall is set as a set temperature. The heating cooker according to 1.
The heating cooker according to claim 1, wherein the heater output of the inner heater is configured to be larger than the heater output of the outer heater.
The heating cooker according to claim 1, wherein the ceiling wall of the heating chamber has a three-dimensional curved surface having a concave surface on the heating chamber side, and is fixed so that the entire surface of the flat heater is in close contact with the ceiling wall.
The cooking device according to claim 4, wherein the three-dimensional curved surface of the ceiling wall of the heating chamber has a rectangular shape in plan view, and a curvature in a longitudinal direction is different from a curvature in a short direction.
The cooking device according to claim 1, wherein the ceiling wall of the heating chamber has a plurality of regions that absorb deformation force of expansion / contraction caused by heat of the flat heater.
The cooking according to claim 1, wherein the ceiling wall of the heating chamber has a plurality of regions that absorb deformation force of expansion / contraction caused by heat of the flat heater, and each of the plurality of regions has the same shape. vessel.
The cooking device according to claim 1, wherein the ceiling wall of the heating chamber has a plurality of polygonal regions that absorb deformation force of expansion / contraction caused by heat of the flat heater.
The heating cooker according to claim 1, wherein the ceiling wall of the heating chamber has a plurality of honeycomb-shaped regions that absorb deformation force of expansion / contraction caused by heat of the flat heater.
The heating cooker according to claim 1, wherein the flat heater is held via a heat insulating material by a press plate having a three-dimensional curved surface attached to the ceiling wall with a movable range.
The pressing plate is formed with a pressing portion projecting in the direction of the inner heater and the outer heater in each region facing the inner heater and the outer heater, and the pressing portion causes the heat insulating material to pass through the heat insulating material. The cooking device according to claim 10, wherein the cooking device is configured to press the inner heater and the outer heater.
The heating cooker according to claim 1, wherein at least a surface on the flat heater side of the ceiling wall of the heating chamber is configured to have a black silicon film.
The cooking device according to claim 1, wherein at least a surface of the ceiling wall on the heating chamber side of the heating chamber has a self-cleaning film.