JP6519881B2 - Cooker - Google Patents

Description

  The present invention relates to a heating cooker for heating and cooking food which is a to-be-cooked material in a heating storage, and more particularly to a heating and cooking storage which is heated by a flat heater provided on a ceiling wall of the heating storage.

  As heating means in the heating cooker, an infrared heater unit which radiates heat rays to heat the food directly, a microwave heating unit which irradiates microwaves to heat the food, a steam heating unit which heats the food by steam, and A hot air circulation unit or the like is used which heats food by circulating hot air inside a heating chamber.

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

Unexamined-Japanese-Patent No. 3-103206 JP, 2010-54124, A

  As described above, in the heating cooker, an appropriate heating means is selected to perform optimum cooking according to the dish on the food which is the food in the heating chamber. ing. When performing cooking using a heating cooker, it is possible that the inside of the heating chamber 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 in making the cooking time, and also important in shortening 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, and the heat radiated from the heated ceiling wall brings the inside of the heating storage to the set temperature Heating. Therefore, it is necessary to efficiently transfer the heat from the flat heater to the inside of the heating chamber. However, since the ceiling wall repeats expansion and contraction due to the heat of the flat heater, it is difficult to keep the ceiling wall and the flat heater in close contact at all times, and a gap (air layer) between the ceiling wall and the flat heater ) Has a problem in that the heat transfer efficiency from the flat heater to the ceiling wall is deteriorated.

  In addition, the heat source (heater wire) of the flat heater is covered with the electrical insulation member, and the heat from the heat source of the flat heater is transmitted to the ceiling wall via the electrical insulation member to heat the ceiling wall and heated ceiling wall The internal temperature of the heating chamber is raised to the set temperature by the heat of. Moreover, in the conventional heating cooker, the temperature inside the storage is detected by the temperature detection means, and on / off control is performed on the flat heater so that the inside of the heating storage becomes the set temperature based on the detected temperature inside the storage. The In such a conventional heating cooker, when the heating chamber is heated by the flat heater until the inside temperature reaches the set temperature, the flat heater when the inside temperature reaches the set temperature is 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 heating cooker, the flat heater is once turned off before the internal temperature reaches the set temperature in consideration of safety and reliability, and thereafter the flat heater is turned on and off By repeating the above, the inside temperature is gradually brought close to the set temperature. As described above, in the conventional heating cooker, since the flat heater is set to the set temperature based on the detected inside temperature, it is difficult to set the set temperature with high accuracy, and the set temperature is reached. It took a long time to

  In addition, in the conventional heating cooker, in order to maintain the temperature in the storage at the set temperature, the control of repeating the on / off operation of simply turning on and off the flat heater is repeated, so the temperature in the storage fluctuates up and down and is constant. It was difficult to maintain the temperature.

  Furthermore, for example, in a heating cooker used in a home, the rated power is defined, and there is a problem that the input power is limited. For this reason, it is necessary to design within a rated power as a heat source provided in a heating cooker, and in particular when a flat heater is used as a heating cooking means, the inside of the heating cabinet is desired considering other heating cooking means It was difficult to quickly start up and cook with the power of

  The present invention is a configuration in which heating is performed using at least a flat heater as the heating and cooking means, the heating internal temperature of the heating storage can quickly rise to the set temperature, and the internal temperature can be maintained at the set temperature. The challenge is to provide

The heating cooker according to one aspect of the present invention is
A heating cabinet for heating the food to be cooked
A planar heater which is provided on the ceiling wall of the heating chamber and which becomes one heat source by an inner heater disposed immediately above the central portion of the ceiling wall and an outer heater surrounding the inner heater, and the planar heater A control unit for controlling the inner heater and the outer heater, respectively;
The ceiling wall of the heating chamber has a three-dimensional curved surface in which the heating chamber side is concave, and is fixed so that the entire surface of the flat heater is in close contact with the ceiling wall .
The ceiling wall of the heating chamber has a plurality of regions that absorb the thermal expansion / contraction deformation force of the flat heater due to heat.
The ceiling wall has a heat generating area to which the flat heater is closely attached.
In the heat generating area, a plurality of areas separated by grooves are formed .

  According to the present invention, the internal temperature can be reached to the set temperature in a short time by using a flat heater as at least the heating and cooking means, and the internal temperature can be reliably maintained at the set temperature. It is possible to provide a cooker capable of performing cooking desired for the user in a short time.

The perspective view which shows the external appearance of the heating cooker of this embodiment The perspective view which shows the state in which the door in the heating cooker of this embodiment was opened The perspective view which shows the state which removed the outer cover of the heating cooker of this embodiment The front view which showed the upper side of the heating cooker of this embodiment in the cross section An exploded perspective view of the flat heater unit in the heating cooker according to the present embodiment The figure which shows the heating storage upper plate of the flat heater unit in the heating cooker of this embodiment An exploded perspective view showing a flat heater in the heating cooker of the present embodiment The top view which shows the heater in the heating cooker of this embodiment Plan view of the flat heater in the heating cooker of the present embodiment The back view of the flat heater in the heating cooker of this embodiment The heating cooker of this embodiment WHEREIN: The perspective view which shows the state by which the flat heater was mounted | worn by the heating storage upper plate The figure which shows the press board in the heating cooker of this embodiment Sectional drawing explaining the mounting method to the heating storage upper plate of the press board in the heating cooker of this embodiment The heating cooker of this embodiment WHEREIN: Cross-sectional view which shows the mounting | wearing state with respect to a heating storage upper board of a pressing plate when a heating storage upper board becomes high temperature Sectional drawing which expands and shows the state with which the heater temperature detection part in the heating cooker of this embodiment was mounted | worn The perspective view which shows the flat heater unit in the heating cooker of this embodiment The figure which shows the flat heater unit in the heating cooker of this embodiment A circuit diagram for controlling the heating and cooking means in the heating and cooking apparatus of the present embodiment The perspective view which shows the heat-generation board used in the heating cooker of this embodiment A plan view of the heating plate shown in FIG.

The heating cooker according to the first aspect of the present invention is
A heating cabinet for heating the food to be cooked
In the flat heater, the flat heater serving as one heat source by the inner heater provided on the ceiling wall of the heating cabinet and disposed immediately above the central portion of the ceiling wall and the outer heater surrounding the inner heater A heating cooker comprising a control unit for controlling the inner heater and the outer heater, wherein
The ceiling wall of the heating chamber has a three-dimensional curved surface in which the heating chamber side is concave, and the entire surface of the flat heater is fixed in intimate contact with the ceiling wall. The heating cooker of the first aspect configured in this way can achieve the inside temperature (upper plate temperature) to reach the set temperature in a short time by using a flat heater as the heating means. The temperature (upper plate temperature) can be reliably maintained at the set temperature.

  In the heating cooker according to the second aspect of the present invention, the three-dimensional curved surface of the ceiling wall surface of the heating storage in the first aspect is rectangular in a plan view, and the curvature in the longitudinal direction is the lateral direction The curvature may be different from that of

  In the heating cooker according to the third aspect of the present invention, the ceiling wall of the heating storage according to the first or second aspect absorbs a plurality of thermal expansion / contraction deformation forces of the flat heater. May be included.

  In the heating cooker according to the fourth aspect of the present invention, the ceiling wall of the heating storage according to the first or second aspect is a plurality of regions where the heat of expansion / contraction due to heat of the flat heater is absorbed. And each of the plurality of regions may have the same shape.

  The heating cooker according to a fifth aspect of the present invention is the heating cooker according to the fifth aspect, wherein the ceiling wall of the heating storage according to the first or second aspect absorbs a plurality of thermal expansion / contraction deformation forces of the flat heater. It may have a square shaped area.

  In the heating cooker according to the sixth aspect of the present invention, the plurality of honeycombs in which the ceiling wall of the heating storage in the first or second aspect absorbs deformation force of expansion / contraction due to heat of the flat heater. It may have an area of shape.

  The heating cooker according to a seventh aspect of the present invention is the heating cooker according to any one of the first to sixth aspects, wherein the flat heater is attached to the ceiling wall with a movable range. It may be configured to be held via a heat insulating material by a pressing plate having a dimensional curved surface.

  In the heating cooker according to an eighth aspect of the present invention, the pressing plate according to the seventh aspect is directed in the direction of the inner heater and the outer heater in the respective regions where the inner heater and the outer heater are opposed. A protruding pressing portion may be formed, and the pressing portion may be configured to press the inner heater and the outer heater via the heat insulating material.

The heating cooker according to a ninth aspect of the present invention is characterized in that the sum of the maximum heater outputs of the inner heater and the outer heater according to any one of the first to eighth aspects is the rated power of the heating cooker. Have a composition that exceeds
The control unit may be configured to control power input to the inner heater such that a sum of heater outputs of the inner heater and the outer heater does not exceed a rated power of the heating cooker.

A heating cooker according to a tenth aspect of the present invention includes heater temperature detection means for detecting the temperature of a region directly heated by the inner heater according to any of the first to ninth aspects,
The control unit may be configured to control the inner heater to rise close to the set temperature of the heating chamber based on the heater temperature information detected by the heater temperature detection unit.

  In the heating cooker according to an eleventh aspect of the present invention, at least the surface on the flat heater side in the ceiling wall of the heating storage according to any one of the first to tenth aspects has a black silicon film It may be configured.

  According to a twelfth aspect of the present invention, there is provided a heating cooker according to any one of the first to eleventh aspects, wherein at least a surface of the ceiling wall of the heating storage on the heating storage side has a self-cleaning film. May be

  Hereinafter, as an embodiment concerning a cooking-by-heating machine of the present invention, a cooking-by-heating machine using at least a plane heater as cooking means will be described with reference to the attached drawings. In addition, the heating cooker of this invention is not limited to the structure of the heating cooker described in the following embodiment, The structure of the heating cooker equivalent to the technical idea demonstrated in the following embodiment is included. It is The embodiments described below show an example of the present invention, and the configurations, functions, operations and the like shown in the embodiments are exemplifications and do not limit the present invention. Among components in the following embodiments, components that are not described in the independent claim indicating the highest concept are described as optional components.

  Hereinafter, the heating cooker of the present embodiment according to the present invention will be described with reference to the attached drawings. FIG. 1 is a perspective view showing the appearance of the heating cooker of the present embodiment. FIG. 2: is a perspective view which shows the state which the door in the heating cooker of this embodiment of FIG. 1 opened.

  As shown to FIG. 1 and FIG. 2, the heating cooker is comprised so that opening and closing of the front opening of the heating storage 4 provided in the inside of the main body 1 by the door 2 are possible. A handle 3 is provided at the upper end of the door 2 and a user holds the handle 3 to turn the door 2 and open and close the front opening of the heating storage 4. The inside of the heating chamber 4 is substantially sealed by closing the door 2, and the 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 for cooking and cooking time setting is provided in the door 2 of the upper opening on the front of the heating cooker . Moreover, the setting part 4 provided in the front of the heating cooker has a display part etc. which display various cooking conditions, the heating condition in heating cooking, etc.

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

  The heating cooker according to the present embodiment is provided with a plurality of heating means, and the user selects the desired heating means, or the user selects the cooking content to select the appropriate heating method. The means is selected. The user arranges the food to be cooked in the heating chamber 1 of the heating cooker, closes the door 2, sets the heating means and the contents of cooking in the setting unit 5, and presses the start button. The operation is started.

  As shown in FIG. 2, in the heating cooker of this embodiment, it is comprised so that the heating dish 6 by which a to-be-heated material is mounted can be accommodated in the inside of the heating storage 4. As shown in FIG. The heating plate 6 can slide on the side walls on both sides of the heating storage 4 so as to be disposed in the upper stage, the middle stage, or the lower stage inside the heating storage 4, and supports the heat generation tray 6 A step that can be made is formed. A heating element (not shown) is embedded in the mounting surface 33 of the heating plate 6. The heating element absorbs microwaves and generates heat, and ferrite or the like is used.

  In the present embodiment, although an example in which ferrite is embedded in the heating plate 6 as a heating element will be described, any heating element may be used as long as it absorbs microwaves and generates heat. It may be applied to Moreover, as a main material of the heat sink 6, what is excellent in heat conduction may be used, and it may be made of metal or ceramic.

  Moreover, in this embodiment, although the heat generating plate 6 is demonstrated by the structure supported by the level | step difference of the side wall of the heating storage 4, the hanging structure from a ceiling wall, the heat generating plate 6 is provided with the foot which protrudes below. It may be configured to be mounted on the bottom wall of the heating cabinet 4.

  In addition, the antenna (not shown) which radiates | emits a microwave to the inside of the heating chamber 4 is arrange | positioned directly under the approximate center of the bottom wall of the heating chamber 4. As shown in FIG. The antenna in the present embodiment has directivity in the radiation direction of the microwaves, and has a configuration capable of radiating circularly polarized waves directly above the antenna. Therefore, in the antenna according to the present embodiment, a rotation mechanism is provided to radiate microwaves uniformly in the heating chamber 4, and the radiation port of the antenna is configured to rotate, and the antenna The heating element of the heating plate 6 disposed immediately above is also configured to radiate circularly polarized light for dielectric heating.

  The bottom wall of the heating cabinet 4 is formed of a material through which the microwaves from the antenna are transmitted, and the other side walls of the heating cabinet 4 are a side wall, a back wall, and a ceiling wall made of steel or stainless steel ( An aluminum plated steel plate of SUS) is used. In addition, on each wall surface, a non-adhesive film layer such as, for example, a fluorine resin or a silicon resin may be formed. By forming such a coating layer, it is possible to prevent adhesion of dirt such as oil and fat scattered during cooking and cooking dust, and it is possible to easily wipe away dirt even if dirt is attached. Furthermore, on each wall surface of the heating storage 4, a coating layer having a self-cleaning function may be formed which decomposes the oil and fat portion scattered during cooking by heating at the time of cooking and cleans automatically. As a method of providing the coating layer with a self-cleaning function, for example, a method of incorporating a catalyst species of manganese oxide type that promotes the oxidative decomposition action into the coated layer, platinum or the like that exerts a remarkable effect on the oxidative decomposition action at low temperature You may use the method of adding palladium etc. whose activity in a high temperature range is high. Furthermore, a method of adding cerium having an adsorption action may be used.

  As described above, the object to be heated (food) placed on the heating plate 6 housed inside the heating chamber 4 is heated to a high temperature by the heat of the heating element dielectrically heated by the microwave. In the present embodiment, the upper surface of the object to be heated (food) placed on the heating plate 6 is heated by the flat heater unit 8 provided on the top of the ceiling wall of the heating chamber 4. It has composition.

  FIG. 3: is a perspective view which shows the state which removed the outer cover in the main body 1 of the heating cooker of this 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 storage 4. FIG. 4: is the front view which showed the upper side of the heating cooker of this embodiment in the cross section. As shown in FIG. 4, it is shown that the upper portion of the heating storage 4 in the heating cooker is configured by the flat heater unit 8. An in-compartment temperature detection unit 9, for example, a thermistor, is provided at a corner portion on the right back of the heating storage 4 as an in-storage temperature detection means for detecting the inside temperature of the heating storage 4. The in-chamber temperature information detected by the in-chamber temperature detection unit 9 is transmitted to the control unit 7 (see FIG. 18) described later and used for control in various heating and cooking operations.

[Plane 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 of FIG. 5, the heating cabinet upper plate 10 constituting the ceiling wall of the heating cabinet 4 and the flat heater 11 closely attached to the upper surface of the heating cabinet upper plate 10. The first heat insulating material 13 for the heating storage upper plate 10 is the pressing tool 12 serving as a backing plate formed of mica, the first heat insulating material 13 for blocking the heat conduction from the flat heater 11 upward, and the flat heater 11. And a presser plate 14 for pressing. In the flat heater unit 8, the insulating sheet 15 for electrically insulating the terminals 24 (see FIG. 16) of the flat heater 11 and the like, and the heat of the flat heater unit 8 are transferred to the outer cover of the main body 1. And a second heat insulating material 17 are provided. As described above, the flat heater unit 8 has a stack type assembly structure, and all of the parts can be replaced at the time of maintenance, thereby improving the maintainability. Furthermore, the flat heater unit 8 is provided with a heater temperature detection unit 18 that is a heater temperature detection unit that detects the temperature of the heating area directly heated by the flat heater 11. Hereinafter, each component in the flat heater unit 8 will be described in detail.

[Heating top plate]
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. In FIG. 6, (a) is a plan view of the heating storage upper plate 10, (b) is an end view by the (b)-(b) line in the heating storage upper plate 10 shown in (a), c) is an end elevation by the (c)-(c) line in the heating cabinet upper board 10 shown to (a).

  The heating storage upper plate 10 constitutes a ceiling wall of the heating storage 4, and a central portion other than the outer peripheral edge of the heating storage upper plate 10 has a rectangular shape (10a) in plan view. This rectangular shape has a curved surface shape in which the heating storage side (lower side) is concave, and becomes a heat generation area 10 a in which the flat heater 11 is disposed in close contact. The heating storage 4 of this embodiment has a rectangular parallelepiped shape whose front side is longitudinal, and the heat generation area 10 a covers substantially the entire ceiling wall of the heating storage 4. A rectangular flat heater 11 corresponding to the shape of the heating chamber 4 is disposed on the entire surface in close contact with the curved heat generating area 10a. Therefore, substantially the 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 (b) of FIG. 6, the cross section in the longitudinal direction (left and right direction of (a) of FIG. 6) of the heat generation region 10a in the heating cabinet upper plate 10 is formed by a curve. Similarly, as shown in the end view of (c) of FIG. 6, the cross section of the heat generating area 10a in the short side direction (vertical direction of (a) of FIG. There is. Therefore, the heat generation area 10a in the heating storage upper plate 10 has a three-dimensional curved surface in which the heating storage side is concave. In the present embodiment, the curvature of the curve in the longitudinal direction of the heat generation region 10a is different from the curvature of the curve in the lateral direction of the heat generation region 10a, and the curvature in the longitudinal direction is smaller than the curvature in the lateral direction.

  As shown in the plan view of (a) of FIG. 6, in the heating cabinet upper plate 10, the heat generation area 10a to which the flat heater 11 is closely attached is a plurality of regular hexagonal shapes (honeycomb shapes) (honeycomb area) ) 10b. In the present embodiment, the boundary of the honeycomb region 10b in the heating storage upper plate 10 is formed by a groove projecting to the heating storage side, and the respective honeycomb regions 10b have substantially the same area. The heating cabinet upper plate 10 configured in this manner is formed by press processing.

  As described above, the heat generation area 10a in the heating storage upper plate 10 is formed to have a plurality of honeycomb areas 10b. For this reason, the heat generation area 10a expands due to the heat of the flat heater 11, or shrinks when the flat heater 11 is shut off, but the deformation force in all directions of the expansion / contraction generated at that time is the respective honeycomb area It is a configuration that can be absorbed within 10b. The heat generating area 10a is heated by the flat heater 11 in close contact, but 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 uneven. For this reason, the deformation force of expansion / contraction in the heat generation area 10a may have different magnitudes in each area. If the heating cabinet upper plate which is the ceiling wall of the heating cabinet 4 has a flat shape and there is no area capable of absorbing the deformation force of expansion / contraction, the ceiling wall is locally heated and deformed unevenly. Distortion, a gap is formed between the heating storage upper plate and the flat heater, and the heat from the flat heater is hardly transmitted.

In the heating cooker of the present embodiment, a plurality of regions (honeycomb regions) 10 b divided by grooves are formed in the heat generation region 10 a of the heating cabinet 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 does not locally deform greatly and does not distort, and the curved surface on the heating storage side becomes concave. The shape will be in a state of rising smoothly overall. As a result, the heat generation area 10a is kept in close contact with the flat heater 11, and the heat from the flat heater 11 can be received efficiently with high efficiency.

  As described above, in the present embodiment, the heat generation area 10a of the heating cabinet upper plate 10 is prevented from being locally deformed, and the heat generation area 10a is entirely lifted while maintaining the same shape as a whole. Because of this, the flat heater 11 is configured to be reliably maintained in close contact with the heat generation area 10a.

  In the present embodiment, the heat generation area 10a of the heating storage upper plate 10 is divided into a plurality of honeycomb areas 10b of a regular hexagonal shape (honeycomb shape), but the area 10b is specified as a honeycomb shape. It is sufficient that the heat generating region 10a is configured of a plurality of regions capable of dispersing and absorbing the local expansion / contraction deformation force. As a plurality of regions for absorbing the deformation force of expansion / contraction, regions of polygonal shapes such as triangles and squares, regions formed by curves, and the like can be used.

  In the heating chamber upper plate 10 in the present embodiment, a pressing plate engaging portion 10 c for mounting a pressing plate 14 described later in a manner capable of moving freely in the vertical direction is provided substantially at the center of the heating chamber upper plate 10. A stepped screw which is a locking tool 19 is screwed into the pressing plate locking portion 10c, and the pressing plate 14 is mounted. Further, a plurality of fasteners 10d for closely attaching the flat heater 11 are provided on the heating storage upper plate 10 in a protruding manner. The fastener 10d is a small piece that protrudes upward from the upper surface of the heat generation area 10a, and is formed by securing a bendable plate material to the upper surface of the heat generation area 10a.

  An aluminum plated steel plate of steel or stainless steel (SUS) is used for the heating cabinet upper plate 10 in the present embodiment. A black film made of, for example, silicon resin is formed on both sides of the heating storage upper plate 10. By forming the black film on the surface on the side of the flat heater as described above, the heat from the flat heater 11 can be efficiently absorbed. In the present embodiment, a coating layer having a self-cleaning function that decomposes fats and oils scattered during cooking by heating during cooking and automatically cleans the surface of the heating cabinet upper plate 10 on the heating cabinet side. Is formed. The method of forming the coating layer having a self-cleaning function is omitted here because it is described above. 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 cabinet 4.

[Plane heater]
FIG. 7 is an exploded perspective view showing the flat heater 11 mounted in close contact with the heat generation area 10 a of the heating storage upper plate 10. As shown in FIG. 7, the heater 25 which is a heat source in the flat 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 constituted by the inner heater 20 and the outer heater 21 as heat sources. The inner heater 20 and the outer heater 21 are disposed substantially on the same plane, and the outer heater 21 is disposed so as to surround the inner heater 20, and each of them is individually 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 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 1. W by setting the heater output which was 650 W conventionally to 900 W. It is six 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 belt-shaped heater wire with a thickness of 0.144 mm is used as the heater wire for the inner heater 20, and a belt-shaped heater wire with a thickness of 0.10 mm is used as the heater wire for the outer heater 21. By winding and forming the heater wire at a high density, the temperature rise of the heating storage upper plate 10 can be made uniform.

  As shown in FIG. 7, the flat heater 11 is a heater 25 configured as one heat source by the inner heater 20 and the outer heater 21 as a plate of two micas of the upper insulating material 22 and the lower insulating material 23 from both sides It is formed sandwiching. FIG. 9 is a plan view of the flat heater 11, showing the upper insulating material 22. As shown in FIG. FIG. 10 is a back view of the flat heater 11, and the lower insulating material 23 is shown.

  As shown in FIGS. 9 and 10, in the upper insulating material 22 and the lower insulating material 23, the regions where the respective heater wires of the inner heater 20 and the outer heater 21 are sandwiched are separated by the slits 22a and 23a. There is. Therefore, in the mutual area in the upper insulation material 22 and the lower insulation material 23 which were heated by each heater wire of the inner side heater 20 and the outer side heater 21, it is the structure where 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 simultaneously energized, they mutually expand, so that the adhesion of the heating storage upper plate 10 can be prevented from being impaired. In addition, the pressing plate locking portion 10c and the plurality of fasteners 10d provided on the above-described heating storage upper plate 10 are inserted into the upper insulating material 22 and the lower insulating material 23 on which the heater 25 is sandwiched. The openings 22 b and 23 b are formed. The flat heater 11 has a terminal plate 24, and terminals connected to the respective heater wires of the inner heater 20 and the outer heater 21 are provided on the terminal plate 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 storage upper plate 10 described above. As shown in FIG. 11, the flat heater 11 is closely mounted on the heat generation area 10 a of the curved surface of the heating storage upper plate 10. The fastener 10d formed on the heating storage upper plate 10 is bent, and the flat heater 11 is closely attached to a predetermined position on the heat generation area 10a. At this time, the fastener 10d of the heating storage upper plate 10 has openings (22b, 23b) formed so as to penetrate the flat heater 11 up and down, and holes 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 generation area 10a by being bent through. Further, the pressing plate engaging portion 10c provided at the center of the heating storage upper plate 10 is disposed in the opening (22b, 23b) formed at 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 first heat insulating material 13 has a function of blocking heat from the upper surface of the flat heater 11, and is made of, for example, glass wool. The first heat insulating material 13 has a shape capable of covering at least the entire surface of the heat generation area 10a of the heating storage upper plate 10, has substantially the same thickness, and has an elastic force (resilience) at least in the thickness direction. Have.

  As shown in FIG. 5 described above, the first heat insulating material 13 is formed with a plurality of openings. The opening formed at the center of the first heat insulating material 13 is a locking portion opening 13a in which the pressing plate locking portion 10c protruding from the heating storage upper plate 10 is accommodated. Further, the first heat insulating material 13 includes a fastener opening 13b for accommodating the fastener 10d provided on the heating storage upper plate 10, a terminal opening 13c through which the heater wire of the flat heater 11 passes, and a flat heater described later A temperature detection opening 13d is accommodated in which a detection end 18a (see FIG. 15) of the heater temperature detection unit 18 which is a heater temperature detection means for detecting the temperature of the heating area directly heated by 11.

[Presser plate]
FIG. 12 is a view showing the pressing plate 14 which covers the upper portion of the first heat insulating material 13 and is attached to the heating storage upper plate 10. In FIG. 12, (a) is a plan view of the presser plate 14, (b) is an end view by the (b)-(b) line in the presser plate 14 shown in (a), and (c) is It is an end elevation by the (c)-(c) line in the holding plate 14 shown to a).

  As shown in FIG. 12, the pressing plate 14 mounted on the heating storage upper plate 10 is formed with a curved surface area 14 a having a curved surface similar to the heating area 10 a formed by the curved surface in the heating storage upper plate 10. . The pressing plate 14 has a function of pressing the flat heater 11 against the heat generation area 10 a of the heating storage upper plate 10 via the first heat insulating material 13, and the entire surface of the flat heater 11 adheres tightly to the heat generation area 10 a I am doing it. 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 of a continuous convex portion protruding toward the flat heater 11, and presses the inner heater 20 and the outer heater 21 of the flat heater 11 via the first heat insulating material 13. Further, since the pressing portion 14 b is formed on the pressing plate 14 as described above, the rigidity of the pressing plate 14 is enhanced. Further, if there is a portion where the adhesion is poor, improvement can be achieved by providing the pressing portion 14b in that portion, and a uniform temperature rise of the heating cabinet upper plate 10 can be achieved.

  As shown in the end view of (b) of FIG. 12, the cross section of the curved surface area 14a of the pressing plate 14 in the longitudinal direction (left and right direction of (a) of FIG. 12) is substantially curved. Similarly, as shown in the end view of (c) of FIG. 12, the cross section of the curved region 14a of the pressing plate 14 in the lateral direction (vertical direction of (a) of FIG. 12) is also substantially composed of curves. ing. Therefore, the curved surface area 14a of the pressing plate 14 has a three-dimensional curved surface which is concave on the heating storage side (lower side). In the present embodiment, the curvature of the curve in the longitudinal direction of the curved region 14a is different from the curvature of the curve in the lateral direction of the curved region 14a, and the curvature in the longitudinal direction is smaller than the curvature in the lateral direction . As described above, the curved surface area 14 a of the pressing plate 14 has the same curved surface as the heat generation area 10 a of the heating storage upper plate 10.

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

  In FIG. 13, the stepped screw 19 which is a locking tool is screwed on the pressing plate locking portion 10c of the heating storage upper plate 10 so that the pressing plate 14 can move up and down relative to the heating storage upper plate 10 It is sectional drawing explaining the method to mount | wear. In FIG. 13, (a) shows a state in the process of screwing the stepped screw 19 into the pressing plate locking portion 10c, and (b) shows a state in which the stepped screw 19 is screwed into the pressing plate locking portion 10c. It has been worn and shown assembled. As shown in FIG. 13, the stepped screw 19 is configured to have a head portion 19a, a cylindrical portion 19b, and a screw portion 19c, and the diameter of the cylindrical portion 19b is formed larger than the diameter of the screw portion 19c. .

  As shown in FIG. 13A, the head 19a of the stepped screw 19 is in contact with the pressing plate 14 while the stepped screw 19 is screwed to the pressing plate locking portion 10c. In the configuration of the present embodiment, as shown in FIG. 13A, after the head 19a of the stepped screw 19 abuts against the holding plate 14, the cylindrical portion of the stepped screw 19 is screwed in at a predetermined pitch. 19b abuts against the pressing plate locking portion 10c of the heating storage upper plate 10, screwing of the stepped screw 19 to the pressing plate locking portion 10c is completed, and the assembly is completed.

  FIG. 14 shows a state where the heating area 10a is expanded and raised when the heating cooker is used and the heat generation area 10a of the heating storage upper plate 10 is heated by the flat heater 11 and becomes high temperature. There is. As shown in FIG. 14, even if the heat generation area 10 a expands and swells, the cylindrical portion 19 b of the stepped screw 19 can slide upward inside the locking portion mounting hole 14 c of the pressing plate 14. For this reason, even if the heat generation area 10a expands and swells, the holding plate 14 does not similarly lift upward, and the flat heater 11 is always pressed against the heat generation area 10a by the holding plate 14 at a predetermined pressure or more. The state is maintained. As described above, in the heating cooker according to the present embodiment, the flat heater 11 is always pressed against the heat generating area 10 a by the pressing plate 14, so that the flat heater 11 is separated from the heat generating area 10 a in the cooking operation. The state of close contact is maintained.

  As shown in the plan view of the pressing plate 14 of FIG. 12A, the pressing plate 14 is provided with a temperature detection mounting portion 14d and a terminal mounting portion 14e. The temperature detection mounting portion 14 d is a portion to which a heater temperature detection portion 18 for detecting a temperature of a region directly heated by heat from the flat heater 11, for example, a thermistor is mounted. The terminal mounting portion 14 e is mounted with the terminal portion 24 having the terminals of the inner heater 20 and the outer heater 21 in the flat heater 11. Each terminal of the terminal part 24 is connected to the power supply part drive-controlled by the control part 7 in the said heating cooker.

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

  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 pressing plate 14 and the like are mounted on the above-mentioned heating storage upper plate 10. As shown in FIG. As shown in FIG. 16, in the flat heater unit 8, a pressing plate 14 is attached so as to cover the heat generation area 10 a in the heating storage upper plate 10.

  FIG. 17 is a view showing the flat heater unit 8. In FIG. 17, (a) is a plan view of the flat heater unit 8, (b) is a cross-sectional view along the (b)-(b) line in the flat heater unit 8 shown in (a), (c) These are sectional drawings by the (c)-(c) line in the flat heater unit 8 shown to (a).

  As shown in FIG. 17, the flat heater unit 8 is substantially integrated and configured, and the flat heater unit 8 configures the ceiling wall of the heating storage 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 and right direction of FIG. 17A) has substantially the same thickness (length in the vertical direction) It is composed of a curved surface. Similarly, as shown in the cross-sectional view of (c) of FIG. 17, the cross-sections of the flat heater unit 8 in the short side direction (vertical direction of (a) of FIG. Is a curved surface that Therefore, the flat heater unit 8 has a three-dimensional curved surface which is entirely concave on the heating storage side (lower side). In the cross-sectional view shown in (b) of FIG. 17, the area enclosed by the reference A indicates a portion to which the stepped screw 19 which is the locking tool shown in FIG. 13 and FIG. There is.

[Heating control]
In the heating cooker according to the present embodiment, as another cooking means of the flat heater unit 8 configured as described above, a magnetron for forming microwaves is provided, and a waveguide for microwaves formed by the magnetron is provided. A microwave heating unit is provided which radiates from the antenna via the antenna. An antenna that radiates microwaves to the heating chamber 4 is disposed below the bottom wall of the heating chamber 4 and has a configuration for radiating microwaves such as circular polarized waves from below to the heating chamber 4 There is. Further, the antenna has a configuration capable of radiating microwaves having directivity, and is configured to be able to uniformly heat the inside of the heating chamber 4 by rotating the antenna.

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

  As described above, as the heating and cooking means in the heating and cooking apparatus 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. A cooking means is selected, and in some cases, a plurality of cooking times are controlled simultaneously or in combination. In the present embodiment, the heating control by the flat heater unit 8 will be mainly described.

  As shown in FIG. 15 described above, the detection end 18 a of the heater temperature detection unit 18 is housed inside the temperature detection opening 13 d formed in the first heat insulating material 13, and the detection of the heater temperature detection unit 18 is performed. The end 18 a is disposed in a heating area (heating space) directly heated by the inner heater 20 of the flat heater 11. The heater temperature detection unit 18 detects the temperature of the space directly heated by the inner heater 20, and transmits the detected temperature to the control unit 7 (see FIG. 18) as heater temperature information. In the control unit 7, the heating / cooking operation is performed according to the contents of cooking set by the user based on the in-chamber temperature information from the in-chamber temperature detection unit 9 that detects the in-chamber temperature of the heating chamber 4 together with the heater temperature information. Control the heat source and drive source in

  In the present embodiment, since the heater temperature detection unit 18 is configured to detect the temperature of the heating area (heating space) directly heated by the inner heater 20, the control unit 7 is configured to receive the high temperature from the heater temperature detection unit 18. Temperature control in the heating and cooking operation by the inner heater 20 can be performed based on the accurate heater temperature information. In the present embodiment, as described later, since the temperature heating operation for rapidly raising the temperature of the heating chamber 4 is performed by the inner heater 20 having a large heater output, the heater temperature information is effective in the speed heating operation. .

  As described in the section of the above-mentioned [Problems to be solved by the invention], in the conventional heating cooker, the flat heater so that the inside of the heating storage becomes the set temperature based on the detected inside temperature. Was configured to perform on-off control for For this reason, in the conventional heating cooker, the flat heater is temporarily turned off before the internal temperature reaches the set temperature, and the on / off operation of the flat heater is repeated thereafter to set the internal temperature. Was gradually brought close to the set temperature. Therefore, it is difficult to accurately set the internal temperature to the set temperature using a flat heater, and it takes time to reach the set temperature.

  In the heating cooker of the present embodiment, the control unit 7 is configured to perform temperature control in the heating and cooking operation based on the heater temperature information and the inside temperature information from the heater temperature detection unit 18. In particular, in the speed heating operation for rapidly raising the temperature of the heating chamber 4 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 area heated by the inner heater 20. Configuration. Therefore, 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 described later, the inner heater 20 in the present embodiment is configured to be able to control the input current to a desired value, and can set the heater output to a desired value. For this reason, in the control unit 7, after the internal temperature reaches the set temperature, the internal current is controlled based on the internal temperature information and the heater temperature information to control the internal temperature with accuracy. It is possible to maintain the set temperature high. As a result, in the heating cooker according to the present embodiment, the time until the internal temperature reaches the set temperature can be significantly shortened, and the internal temperature can be maintained at the set temperature for a predetermined time with high accuracy. It becomes possible.

[Heating operation]
FIG. 18 is a part of a circuit diagram for controlling the heating and cooking means in the heating and cooking apparatus of the present embodiment. As a heat source in the heating 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 at (see FIG. 18). Further, in the hot air circulation unit, a 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 fan motor 29 are connected to switching elements so as to be on / off controlled. Moreover, it is connected to the inverter circuit as a drive power supply of the magnetron which is a microwave generation means in a microwave heating unit. In this embodiment, the drive control of the inner heater 20 is performed using the TRIAC 30 as a switching element, and the configuration is such that the current input to the inner heater 20 can be controlled to a desired value. The outer heater 21 uses a relay as a switching element that simply switches on / off. Although the outer heater 21 in the present embodiment is described using a relay as a switching element that simply switches on / off, as with the inner heater 20, a triac is used as a switching element to step the input power steplessly. It may be configured to be variably controlled.

  In a heating cooker, there is a predetermined rated power, and it is not possible to use power higher than the rated power. The heating cooker according to the present embodiment is configured to be able to heat and cook using a plurality of heating and cooking means, and is controlled by the control unit 7 so that the power consumption such as the heat source to be started is always within the rated power. . In particular, characteristic control is performed in the flat heater unit 8 in the heating cooker of the present embodiment.

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

  Hereinafter, the specific cooking operation using the cooking means in the heating cooker of this embodiment is demonstrated using an illustration.

  When only the flat heater unit 8 is used to heat and cook the heating cabinet 4 with the substantially entire surface of the ceiling wall as a heating element, for example, the inner heater 20 of the flat heater 11 is drive-controlled to a heater output of 700 W. By making the heater output of 700 W into the on state, the heating chamber 4 can be heated by the heater output of a total of 1400 W as the flat heater 11.

  In the case of using the flat heater unit 8 and the microwave heating unit to cook by microwave from the lower side of the ceiling wall and the bottom wall with respect to the heating chamber 4, for example, the inner heater 20 of the flat heater 11 is 900 W The heating heater 4 is heated from the upper side by the heater output of a total of 900 W as the flat heater 11 with the outer heater 21 in the OFF state (0 W) with the maximum heater output. On the other hand, in the microwave heating unit used as another heating and cooking means, for example, 450 W is used as the power consumption of the magnetron 28 to heat the heating plate 6 stored in the heating chamber 4 to heat the heating plate 6. The placed food can be cooked.

  As another example, the outer heater 21 is off (0 W), the inner heater 20 is a heater output of 430 W, and 550 W is used for power consumption such as the magnetron 28 in the microwave heating unit, and mounted on the heating plate 6 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 below the rated power (1500 W = 15 A (rated current) × 100 V) in a typical home The desired cooking operation can be performed.

  In the heating cooker of the present embodiment, intensive heating can be performed on the central portion of the heating storage 4 by using the flat heater unit 8 and the microwave heating unit. In the flat heater 11, the heater output per unit area is 1.6 times by setting the heater output which was 650 W conventionally to 900 W. In particular, the inner heater 20 is configured to have 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 of the heating storage 4 can be rapidly heated by the inner heater 20 having a large heater output, the central portion of the ceiling wall becomes a heating element. Can intensively radiate heat to the central portion of the heating chamber 4. In addition, by forming the heater wire with high density and forming it, it is possible to achieve uniform temperature rise of the heating storage upper plate 10.

  On the other hand, in the configuration of the present embodiment, microwaves (circularly polarized waves) can be concentrated from the antenna of the microwave heating unit from the lower side of the heating chamber 4 toward the central portion of the heating chamber 4. ing. A heating plate 6 in which a food to be heated is placed is accommodated in the heating chamber 4, and a placing element 33 of the heating plate 6 has a heating element for absorbing microwaves and generating heat buried therein. It is done. As a result, the food on the mounting surface of the heating plate 6 is heated from the lower side by the heating plate 6 heated by the heating element by the microwave heating unit, and the flat heater unit 8 The central portion is heated to receive heat radiation from the central portion from above to be intensively heated. That is, in the heating cooker according to the present embodiment, the food in the heating plate 6 contained in the heating storage 4 can be rapidly heated from above and below at high temperature. .

  FIG. 19 is a perspective view showing a heating plate 6 used in the heating cooker of the present embodiment. FIG. 20 is a plan view of the heat generating plate 6 shown in FIG. As shown in FIGS. 19 and 20, the planar view has a rectangular shape, and the outer edge portion 34 has a flange shape that spreads outward. A central portion surrounded by the outer edge portion 34 has a concave shape, and the bottom surface is a mounting surface 33. The mounting surface 3 has an uneven shape. The uneven | corrugated shape in the mounting surface 33 has the valley part and peak part alternately formed with respect to the left-right direction (left-right direction of the said heating cooker) of the mounting surface 33 alternately. In the present embodiment, the slanted valley portion and the peak portion are extended at an angle of about 45 degrees with respect to the left-right direction.

  Further, in the central portion of the mounting surface 33 of the heating plate 6, an area boundary mark 32 showing a rectangular shape is provided. The inner side of the area boundary mark 32 is a speed heating area B, and speed cooking is performed intensively on the object using microwave heating by the inner heater 20 of the flat heater unit 8 and the microwave heating unit described above. An area is shown. Therefore, the user can place the food which is the food to be cooked on the speed heating area B inside the area boundary mark 32 of the heating plate 6, and can perform the speed cooking. In addition, as the area | region boundary mark 32, what is necessary is just the structure which can be confirmed easily by vision and a tactile sense by convex shape, concave shape, or printing.

  As described above, in the heating cooker according to the present embodiment, in the configuration in which cooking is performed using at least the flat heater as the heating means, it is possible to speed up the rise of the temperature inside the storage and at the same time the inside of the storage It becomes the structure which can maintain temperature (heating store upper plate temperature) at fixed temperature.

  The heating cooker according to the present embodiment can set the in-chamber temperature (heating-storage upper plate temperature) to the set temperature with high accuracy, and can shorten the time until the in-chamber temperature reaches the set temperature. It becomes the composition which can achieve shortening of time.

  Furthermore, in the heating cooker according to the present embodiment, in particular, the rated power is specified in the heating cooker used in general homes, but using a plurality of power devices whose total power consumption exceeds the rated power The configuration is such that the inside of the heating chamber can be rapidly started up with a desired high heating power and rapidly cooked.

  The heating cooker according to the present invention has a configuration capable of quickly raising the temperature in the refrigerator to a desired temperature, so that the cooking time can be shortened, and it becomes a cooking device with high market value.

DESCRIPTION OF SYMBOLS 1 main body 2 door 3 grip 4 heating storage 5 setting part 6 heat generating plate 7 control part 8 flat surface heating unit 9 interior temperature detection part 10 heating storage upper plate (ceiling wall)
DESCRIPTION OF SYMBOLS 10a Heat generation area 10b Honeycomb area 10c Presser plate latching | locking part 10d Fastening 11 Flat heater 12 Presser 13 1st heat insulating material 14 Press down plate 15 Insulating sheet 16 Heat shield plate 17 2nd heat insulating material 18 Heater temperature detection part (Thermistor)
18a Detection end 19 Locking tool (stepped screw)
Reference Signs List 20 inner heater 21 outer heater 22 upper insulating material 23 lower insulating material 24 terminal portion 25 heater 26 steam heater 27 rear heater 28 magnetron 29 circulating fan motor 30 triac 31 switch 32 area boundary mark 33 mounting surface 34 outer edge portion

Claims (11)

Heating chamber for heating the food to be cooked
A planar heater which is provided on the ceiling wall of the heating chamber and which becomes one heat source by an inner heater disposed immediately above the central portion of the ceiling wall and an outer heater surrounding the inner heater, and the planar heater A control unit for controlling the inner heater and the outer heater, respectively;
The ceiling wall of the heating chamber has a three-dimensional curved surface in which the heating chamber side is concave, and is fixed so that the entire surface of the flat heater is in close contact with the ceiling wall .
The ceiling wall of the heating chamber has a plurality of regions that absorb the thermal expansion / contraction deformation force of the flat heater due to heat.
The ceiling wall has a heat generating area to which the flat heater is closely attached.
The heating cooker is provided with a plurality of areas divided by a groove in the heat generation area .   The heating cooker according to claim 1, wherein the three-dimensional curved surface of the ceiling wall surface of the heating storage has a rectangular shape in a plan view, and the curvature in the longitudinal direction is different from the curvature in the transverse direction.   The heating cooker according to claim 1 or 2, wherein the ceiling wall of the heating storage has a plurality of regions that absorb the deformation force of thermal expansion / contraction of the flat heater.   The heating cooker according to claim 1 or 2, wherein a ceiling wall of the heating cabinet has a plurality of polygonal shaped regions that absorb the deformation force of thermal expansion / contraction of the flat heater.   The heating cooker according to claim 1 or 2, wherein the ceiling wall of the heating storage has a plurality of honeycomb-shaped regions that absorb the deformation force of expansion / contraction due to heat of the flat heater. The heating according to any one of claims 1 to 5 , wherein the flat heater is held via a heat insulating material by a pressing plate having a three-dimensional curved surface attached with a movable range to the ceiling wall. Cooking device. The pressing plate is formed with pressing portions projecting in the direction of the inner heater and the outer heater in respective regions facing the inner heater and the outer heater, and the pressing portion causes the pressing member to interpose the heat insulating material. The cooker according to claim 6 , configured to press an inner heater and the outer heater. The sum of the maximum heater output of the inner heater and the outer heater exceeds the rated power of the heating cooker,
Wherein the control unit is configured to control the power input to the inner heater, wherein the inner heater and the outer sum is the heater output of the heater cooking device according to claim 1 to 7 which is configured so as not to exceed the rated power of the Any one cooking cooker. Heater temperature detection means for detecting the temperature of the area directly heated by the inner heater;
The controller according to any one of claims 1 to 8 , wherein the control unit controls the inner heater to rise to a temperature close to the set temperature of the heating chamber based on the heater temperature information detected by the heater temperature detection unit. Heating cooker. The heating cooker according to any one of claims 1 to 9 , wherein at least the surface on the flat heater side of the ceiling wall of the heating cabinet is configured to have a black silicon film. The heating cooker according to any one of claims 1 to 10 , wherein a surface on the heating storage side of at least a ceiling wall of the heating storage is configured to have a self cleaning film.

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