JP2023032378A - heating cooker - Google Patents

Abstract

To provide a heating cooker which has heater wires hardly coming into contact with each other and can improve the heating efficiency of the outside heater.SOLUTION: A heating cooker includes: a heating chamber for heating an object to be cooked; and a plane heater constituting a heat source by an inside heater disposed on a ceiling wall of the heating chamber and an outside heater surrounding the inside heater. The outside heater is structured by winding a heater wire around an outside mica, and the inside heater is structured by winding a heater wire around the inside mica. The outside mica has a frame thick part and a frame thin part. The heater wire is laid almost like a straight line along the longitudinal direction of the frame thin part. An upper side mica covering the upper surface side of at least part of the heater wire laid over the frame thin part is further provided.SELECTED DRAWING: Figure 6

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cooker for cooking food, which is an object to be cooked in a heating chamber, and more particularly to a heating cooker for heating by a flat heater provided on the ceiling wall of the heating chamber.

Heat cooking means in the heating cooker include 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 with water vapor, and A hot air circulation unit or the like is used to heat food by circulating hot air inside the heating chamber.

In addition, as a heating cooking means in the heating cooker, there is a configuration in which a flat heater is provided on the ceiling wall of the rectangular parallelepiped heating chamber to heat the ceiling wall, and the interior of the heating chamber is indirectly heated by the ceiling wall. (See Patent Documents 1 and 2).

In addition, there is a configuration in which a flat heater is arranged on the ceiling wall and the internal temperature is raised using the flat heater (see Patent Document 3).

JP-A-3-103206 JP 2010-54124 A JP 2017-161163 A

However, in order to increase the heating efficiency of not only the inner heater but also the outer heater of the inner heater and the outer heater in the planar heater, it becomes necessary to arrange the heater wire almost entirely over the outer mica of the outer heater.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cooking device in which heater wires are less likely to come into contact with each other and the heating efficiency of the outer heater can be improved.

One aspect of the present invention is a heating cooker comprising:
a heating chamber for heating the food to be cooked;
A heating cooker comprising a planar heater that constitutes a heat source with an inner heater disposed on the ceiling wall of the heating chamber and an outer heater surrounding the inner heater,
The outer heater has a heater wire wound around the outer mica, and the inner heater has a heater wire wound around the inner mica,
The outer mica has a thick frame portion and a detailed frame portion,
A heater wire is laid substantially linearly along the longitudinal direction of the frame details,
An upper mica is further provided to cover the upper surface side of at least a portion of the heater wire laid on the frame details.

According to the present invention, it is possible to provide a heating cooker having a configuration that enables efficient cooking using at least a flat heater as a cooking means.

The perspective view which shows the external appearance of the heating cooker of this embodiment. A perspective view showing a state in which the door of the heating cooker of the present embodiment is open. The perspective view which shows the state which removed the outer cover of the heating cooker of this embodiment. FIG. 2 is an exploded perspective view of the planar heater unit in the heating cooker of the present embodiment; The figure which shows the heating chamber upper plate of the flat heater unit in the heating cooker of this embodiment. Schematic exploded view showing a planar heater in the heating cooker of the present embodiment. A plan view showing the vicinity of mica on the upper surface of the outer heater in the heating cooker of the present embodiment. Partial plan view of frame details of the outer heater in the heating cooker of the present embodiment A plan view of a planar heater in the heating cooker of the present embodiment Back view of the flat heater in the heating cooker of the present embodiment A circuit diagram for controlling the heat cooking means in the heat cooker of the present embodiment

The heating cooker of the first aspect according to the present invention comprises
a heating chamber for heating the food to be cooked;
A heating cooker comprising a planar heater that constitutes a heat source with an inner heater disposed on the ceiling wall of the heating chamber and an outer heater surrounding the inner heater,
The outer heater has a heater wire wound around the outer mica, and the inner heater has a heater wire wound around the inner mica,
The outer mica has a thick frame portion and a detailed frame portion,
A heater wire is laid substantially linearly along the longitudinal direction of the frame details,
An upper mica is further provided to cover the upper surface side of at least a portion of the heater wire laid on the frame details. In the heating cooker of the first aspect configured in this manner, the heater wires are less likely to come into contact with each other, and the heating efficiency of the outer heater can be enhanced.

According to a second aspect of the present invention, in the heating cooker, a plurality of heater wires are laid substantially linearly along the Nagata direction of the details of the frame in the first aspect, and the upper mica forms the plurality of heater wires. may be configured to be separated from each other.

A cooking device according to a third aspect of the present invention is a heater wire laid substantially linearly along the longitudinal direction of the frame detail in the first or second aspect, and wound around the inner mica. A part of the heater wires may be arranged substantially parallel and close to each other, and the respective heater wires may be separated by the frame details.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, as an embodiment of a heating cooker of the present invention, a heating cooker using at least a flat heater as a heating means will be described with reference to the accompanying drawings. In addition, the heating cooker of the present invention is not limited to the configuration of the heating cooker described in the following embodiments, and includes the configuration of the heating cooker equivalent to the technical idea described in the following embodiments. It is a thing. The embodiments described below show examples of the present invention, and the configurations, functions, operations, etc. shown in the embodiments are examples and do not limit the present invention. Among the constituent elements in the following embodiments, constituent elements not described in independent claims representing the highest concept will be described as optional constituent elements.

(Embodiment 1)
BEST MODE FOR CARRYING OUT THE INVENTION A heating cooker according to an embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view showing the appearance of the heating cooker of this embodiment. FIG. 2 is a perspective view showing a state in which the door of the heating cooker of the present embodiment shown in FIG. 1 is opened.

As shown in FIGS. 1 and 2, the heating cooker is configured such that a front opening of a heating chamber 4 provided inside a 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 a user grips the handle 3 to rotate the door 2 to open and close the front opening of the heating chamber 4 vertically. The interior of the heating chamber 4 is substantially sealed by closing the door 2, and the food to be heated placed inside the heating chamber 4 is cooked in a substantially sealed state.

As shown in FIG. 1, on the front of the heating cooker is a setting unit 5 which is a dial-shaped knob for setting various cooking conditions such as cooking temperature setting, cooking time setting, etc. on the top-opening door 2. is provided. In addition, the setting section 5 provided on the front side of the heating cooker also has a display section for displaying various cooking conditions, the heating state during cooking, and the like.

As the heat cooking means in the heat cooker of the present embodiment, a microwave heating unit that irradiates microwaves to heat food is provided in addition to the flat heater. Also, a steam heating unit that heats the food with steam and a hot air circulation unit that heats the food by circulating hot air inside the heating chamber 4 may be used. In the microwave heating unit, an antenna for emitting microwaves is provided under the bottom wall of the heating chamber 4, and the directional antenna radiates the microwaves in a desired direction inside the heating chamber 4. is. When a steam heating unit is provided, a water tank is provided inside the main body 1, and steam generated by heating water from the water tank to a high temperature by a steam heater of a boiler is concentrated inside the heating chamber 4. It is configured to inject. When a hot air circulation unit is provided, the air sucked from the heating chamber 4 is heated by a back heater provided on the back side of the heating chamber 4, and the hot air is supplied to the inside of the heating chamber 4.

In the heat cooker of the present embodiment, a plurality of heat cooking means are provided, and the user selects the desired heat cooking means or the user selects the cooking content. It is a configuration in which means are selected. A user places the food to be cooked in the heating chamber 4 of the heating cooker, closes the door 2, sets the heating cooking means and cooking content in the setting unit 5, and presses the start button to cook. Action is started.

As shown in FIG. 2, in the heating cooker of the present embodiment, a heating dish 6 on which an object to be heated is placed can be accommodated inside the heating chamber 4 . The heating dish 6 is slidable on both side walls of the heating chamber 4 so that the heating dish 6 is arranged in the upper, middle, or lower stage inside the heating chamber 4, and supports the heating dish 6. A step is formed to allow A heating element (not shown) is embedded in the mounting surface of the heating plate 6 . The heating element absorbs microwaves to generate heat, and ferrite or the like is used.

In this embodiment, an example in which ferrite is embedded in the heating dish 6 as a heating element will be described, but any heating element that generates heat by absorbing microwaves may be used. You may apply|coat and comprise. Moreover, the main material of the heating plate 6 may be any material that has excellent heat conductivity, and may be made of metal or ceramic.

In this embodiment, the heating dish 6 is supported by the steps of the side wall of the heating chamber 4. However, the heating dish 6 is suspended from the ceiling wall, and the heating dish 6 is provided with legs projecting downward. It may be configured to be placed on the bottom wall of the heating chamber 4 .

Note that an antenna (not shown) for radiating microwaves inside the heating chamber 4 is arranged directly below the approximate center of the bottom wall of the heating chamber 4 . The antenna in this embodiment has directivity in the radiation direction of microwaves and has a configuration capable of radiating circularly polarized waves directly above the antenna. Therefore, in the antenna of the present embodiment, a rotating mechanism is provided so as to uniformly radiate microwaves inside the heating chamber 4, and the antenna radiation port is configured to rotate. Circularly polarized waves are also radiated to the heating element of the heating plate 6 arranged directly above to perform dielectric heating.

The bottom wall of the heating chamber 4 is made of a material through which microwaves from the antenna are transmitted, and the other walls of the heating chamber 4, the side wall, the rear wall, and the ceiling wall, are made of steel or stainless steel ( SUS) aluminum plated steel plate is used. Moreover, each wall surface may be formed with a coating layer having non-adhesiveness such as fluorine resin or silicone resin. By forming such a coating layer, it is possible to prevent the adhesion of dirt such as oil and cooking dregs scattered during cooking, and even if the dirt adheres, the structure is such that the dirt can be easily wiped off. Furthermore, on each wall surface of the heating chamber 4, a coating layer having a self-cleaning function that automatically cleans by decomposing oil and fat components scattered during cooking may be formed by heating during cooking. Methods for imparting a self-cleaning function to the coating layer include, for example, a method of blending a manganese oxide-based catalyst species that promotes oxidative decomposition into the coating layer; A method of adding palladium or the like having high activity in a medium to high temperature range may also be used. Furthermore, a method of adding cerium or the like, which has an adsorptive effect, 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 microwaves. However, in this embodiment, the upper surface of the object to be heated (food) placed on the heating dish 6 is heated by the flat heater unit 8 provided on the upper part of the ceiling wall of the heating chamber 4. have a configuration.

FIG. 3 is a perspective view showing a state in which the outer cover is removed from the main body 1 of the heating cooker of the present embodiment. As shown in FIG. 3, a planar heater unit 8 is provided on the ceiling side of the main body 1 of the heating cooker, that is, in a portion including the ceiling wall of the heating chamber 4 . As shown in FIG. 3, the upper part of the heating chamber 4 in the heating cooker is configured with a flat heater unit 8. As shown in FIG. An in-chamber temperature detector 9 , for example, a thermistor, is provided at the right rear corner of the heating chamber 4 as chamber temperature detecting means for detecting the chamber temperature inside 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. 11), which will be described later, and used for control in various heat cooking operations. Although the thermistor is provided at the right rear corner of the heating chamber 4, it can be installed at the left rear corner, the right front corner, or the left front corner as long as the temperature inside the heating chamber 4 can be detected. etc., can be placed anywhere.

[Flat heater unit]
FIG. 4 is an exploded perspective view showing the planar heater unit 8 in an exploded manner. As shown in FIG. 4, the flat heater unit 8 includes, from the bottom in FIG. and a first heat insulating material 13 that blocks upward heat conduction from the planar heater 11 . The planar heater unit 8 also includes an insulating sheet 15 that electrically insulates the terminal portion 24 of the planar heater 11 and the like, and a heat shield that blocks heat transfer from the planar heater unit 8 to the outer cover of the main body 1 . A plate 16 is provided. In this manner, the flat heater unit 8 has a stacking assembly structure, and all parts can be replaced during maintenance, thereby improving maintainability. Further, the planar heater unit 8 is provided with a heater temperature detecting section 18 which is a heater temperature detecting means for detecting the temperature of the heating area directly heated by the planar heater 11 . Each component in the planar heater unit 8 will be described in detail below.

[Heating chamber upper plate]
FIG. 5 is a view showing the heating chamber top plate 10 that constitutes the ceiling wall of the heating chamber 4 in the flat heater unit 8. As shown in FIG. In FIG. 6, (a) is a plan view of the heating chamber top plate 10, and (b) is an end view of the heating chamber top plate 10 shown in (a) taken along the line (b)-(b). c) is an end view taken along line (c)-(c) of the heating chamber upper plate 10 shown in (a).

The heating chamber top plate 10 constitutes the ceiling wall of the heating chamber 4, and the central portion of the heating chamber top plate 10 other than the outer peripheral edge has a substantially square shape (10a) in plan view. This square shape has a curved surface shape with a concave surface on the heating chamber side (lower side), and serves as a heat generating region 10a on which the flat heater 11 is closely attached. When viewed from the front, the heating chamber 4 of the present embodiment has a rectangular parallelepiped shape whose longitudinal direction is the width direction and the depth direction with respect to the height direction. covering. A rectangular planar heater 11 corresponding to the shape of the heating chamber 4 is disposed over the entire surface in close contact with the curved heat generating region 10a. Therefore, substantially the entire surface of the heating chamber top plate 10 constituting the ceiling wall of the heating chamber 4 serves as a heating element heated by the flat heater 11 .

As shown in the end view of FIG. 5(b), the cross section of the heating region 10a in the heating chamber upper plate 10 in the horizontal direction (horizontal direction in FIG. 5(a)) is curved. Similarly, as shown in the end view of FIG. 5(c), the cross section of the heating region 10a in the heating chamber upper plate 10 in the vertical direction (vertical direction in FIG. 5(a)) is also composed of curved lines. . Therefore, the heating region 10a of the heating chamber upper plate 10 has a three-dimensional curved surface with a concave surface on the heating chamber side.

As shown in the plan view of FIG. 5( a ), in the heating chamber upper plate 10 , the heat generating region 10 a in which the flat heaters 11 are closely mounted includes a plurality of regular hexagonal (honeycomb) regions (honeycomb regions). ) 10b. In this embodiment, the boundaries of the honeycomb regions 10b in the upper plate 10 of the heating chamber are formed by grooves protruding toward the heating chamber, and the respective honeycomb regions 10b have substantially the same area. The heating chamber upper plate 10 configured in this way is formed by press working.

As described above, the heating region 10a in the heating chamber upper plate 10 is formed with a plurality of honeycomb regions 10b. Therefore, the heat generating region 10a expands due to the heat of the planar heater 11, or contracts when the planar heater 11 is shut off, and the deformation force of expansion/contraction generated at that time is applied to each honeycomb region. It is a configuration that can be absorbed within 10b. The heat generating region 10a is heated by the flat heater 11 in close contact with the heat generating region 10a. Therefore, the deformation force of expansion/contraction in the heat generating region 10a may have different magnitudes in each region. If the upper plate of the heating chamber, which is the ceiling wall of the heating chamber 4, has a flat shape and does not have a region that can absorb the deformation force of expansion/contraction, the ceiling wall will be locally heated and deformed unevenly. A gap is created between the distortion and the upper plate of the heating chamber and the planar heater, resulting in a structure in which the heat from the planar heater is difficult to transfer.

In the heating cooker of the present embodiment, a plurality of regions (honeycomb regions) 10b partitioned by grooves are formed in the heat generating region 10a of the upper plate 10 of the heating chamber. Therefore, the deformation force of expansion/contraction is dispersed and absorbed in each of these honeycomb regions, and the heating region 10a as the ceiling wall is a curved surface with a concave surface on the heating chamber side, without being locally greatly deformed and distorted. The overall shape becomes smooth and raised. As a result, the heat generating region 10a maintains a state of being in close contact with the planar heater 11, and can receive heat from the planar heater 11 efficiently and reliably.

As described above, in the present embodiment, the heat generating region 10a on the upper plate 10 of the heating chamber is prevented from being locally deformed, and the heat generating region 10a maintains the same shape as a whole and is raised as a whole. Therefore, the planar heater 11 is reliably maintained in close contact with the heat generating region 10a.

In the present embodiment, the heat generating region 10a in the upper plate 10 of the heating chamber is divided into a plurality of regular hexagonal (honeycomb-shaped) honeycomb regions 10b. However, it is sufficient if it is composed of a plurality of regions that can disperse and absorb the deformation force of local expansion/contraction in the heat generating region 10a. As the plurality of regions that absorb the deformation force of expansion/contraction, polygonal regions such as triangles and squares, regions composed of curved lines, and the like can also be used.

Steel or stainless steel (SUS) aluminum-plated steel plate is used for the upper plate 10 of the heating chamber in this embodiment. On both sides of the upper plate 10 of the heating chamber, a black film body made of silicone resin, for example, is formed. By forming the black film on the plane heater side surface in this manner, the heat from the plane heater 11 can be efficiently absorbed. In the present embodiment, the heating chamber side surface of the heating chamber upper plate 10 is provided with a coating layer having a self-cleaning function that automatically cleans by decomposing fats and oils scattered during cooking by heating during cooking. is formed. Since the method for forming the coating layer having the self-cleaning function has been described above, it will be omitted here. In addition, in this embodiment, a coating layer having a self-cleaning function is also formed on the side walls and the rear wall of the heating chamber 4 .

[Flat heater]
FIG. 6 is an exploded schematic view showing the planar heater 11 attached in close contact with the heat generating region 10a of the upper plate 10 of the heating chamber. As shown in FIG. 6, an outer heater 21 and an inner heater 20 are arranged between two mica plates, an upper insulating material 22 and a lower insulating material 23, and the sides of the upper insulating material 22 and the lower insulating material 23 are arranged. The position of the side P of the outer heater 21 is arranged at the position corresponding to P. A heater 25 serving as a heat source in the planar heater 11 is divided into an inner heater (inner heater) 20 and an outer heater (outer heater) 21 . The inner heater 20 and the outer heater 21 are arranged substantially on the same plane, the outer heater 21 is arranged so as to surround the inner heater 20, and are individually driven and controlled.

The inner heater 20 has a substantially rectangular shape, the outer heater has a substantially square shape, and the outer heater 21 is arranged so as to surround the inner heater 20, so that the outer heater is composed of a thick frame portion 21d and a detailed frame portion 21c. be. In the present embodiment, the inner heater 20 is steplessly variably controlled within a range of 300 W to 900 W, for example, and the outer heater 21 is on/off controlled at 700 W, for example.

The inner heater 20 and the outer heater 21 are formed by winding a heater wire 20b and a heater wire 21b, respectively, on an inner mica 20a and an outer mica 21a, which are insulating plates. As a result, the heater output per unit area is increased by 1.6 times. In this embodiment, for example, a heater output of 3.0 W/cm ² (inner heater) is possible. In the present embodiment, a heater wire having a thickness of 0.144 mm is used as the heater wire of the inner heater 20 , and a heater wire having a thickness of 0.10 mm is used as the heater wire of the outer heater 21 . By winding the heater wire at a high density, the temperature rise of the upper plate 10 of the heating chamber can be made uniform.

The frame details 21c of the outer heater 21 are also laid with two heater wires 21b1 substantially linearly along the longitudinal direction of the frame details 21c. By laying a plurality of heater wires 21b1 on the frame details 21c in this way, it is possible to heat the heating chamber 4 from the vicinity of the center of the heating chamber 4 to the end of the heating chamber 4 in a plan view. When two pieces of bread are arranged side by side in the cabinet 4 and heated, even the edges of the bread can be sufficiently heated.

The frame details 21c are made of a plurality of mica, and a plurality of heater wires 21b1 are laid on the lower mica 21a2. Further, the heater wire 21b1 is sandwiched between the lower mica 21a2 and the upper mica 21a1 arranged near the center of the frame detail 21c.

In FIG. 7, cut holes 40 for fixing to the heater wire 21b1 are provided at both ends of the upper mica 21a1, and the heater wire 21b1 is passed through the cut holes 40 at both ends, and the heater wire By arranging it above the lower mica 21a2, it is possible to separate the two heater wires 21b1 from each other and avoid the two heater wires 21b1 from coming into contact with each other and short-circuiting. In addition, without being limited to the configuration of the cut hole 40, the upper mica 21a1 and the lower mica 21a2 may be provided with a regulating rib to separate the two heater wires 21b1. A configuration may be adopted in which two heater wires 21b1 are adhered to the side mica 21a2.

In FIG. 8, the relationship between the heater wire 21b1 and mica will be described. The plurality of heater wires 21b1 are spaced apart below the upper mica 21a1 and above the lower mica 21a2 in the range Q1. Furthermore, the plurality of heater wires 21b1 are spaced apart above the lower mica 21a2 in the range of R, and the upper side of the heater wires 21b1 is not covered with the upper mica 21a1. Furthermore, the plurality of heater wires 21b1 are spaced apart below the thick frame portion mica 21a3 of the thick frame portion 21d and above the lower mica 21a2 in the range Q2. By configuring in this way, it is possible to separate the two heater wires 21b1 from each other, thereby avoiding contact between the two heater wires 21b1 and short-circuiting. A similar effect can be obtained when there is only one heater wire 21b1 or when there are two or more heater wires 21b1.

Also, as shown in FIG. 6, in the inner heater 20, the heater wire 21b1, which is part of the heater wire of the outer heater, is adjacent to, substantially parallel to, and substantially linearly arranged in the vicinity of the heater wire 21b1. Regarding 20b1, since the heater wire 20b1 can be separated from the heater wire 21b1 of the outer heater arranged in the frame detail 21c, it is possible to avoid the heater wire 21b1 and the heater wire 20b1 from contacting each other and short-circuiting. . Moreover, since the heater wire 20b1 and the heater wire 21b1 can be separated by an appropriate distance, the object to be heated such as bread can be appropriately heated without lowering the efficiency of the heater. The same effect can be obtained even when there is only one heater wire 21b1 or when there are two or more heater wires 21b1.

Further, as shown in FIG. 6, the planar heater 11 has a heater 25 composed of an inner heater 20 and an outer heater 21 as one heat source, and two mica plate members, an upper insulating material 22 and a lower insulating material 23, are attached to both sides of the heater 25. It is formed by sandwiching from FIG. 9 is a plan view of the planar heater 11, showing the upper insulating material 22. FIG. FIG. 10 is a back view of the planar heater 11, showing the lower insulating material 23. FIG.

As shown in FIGS. 9 and 10, in the upper insulating material 22 and the lower insulating material 23, part of the area where the heater wires of the inner heater 20 and the outer heater 21 are sandwiched is formed by slits 22a and 23a. separated. Therefore, in the mutual regions of the upper insulating material 22 and the lower insulating material 23 heated by the heater wires of the inner heater 20 and the outer heater 21, heat transfer from other regions is blocked. The effect of partitioning 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 upper plate 10 of the heating chamber can be prevented from being impaired. The upper insulating material 22 and the lower insulating material 23 sandwiching the heater 25 are formed with openings 22b and 23b into which the presser plate engaging portion 10c provided on the upper plate 10 of the heating chamber is inserted. It is The planar heater 11 has a terminal portion 24 , and terminals connected to respective heater wires of the inner heater 20 and the outer heater 21 are provided on the terminal portion 24 .

[First heat insulating material]
As shown in FIG. 4, the first heat insulating material 13 is arranged so as to cover the planar heater 11 . The first heat insulating material 13 has a function of blocking heat from the upper surface of the planar heater 11, and is made of glass wool, for example. The first heat insulating material 13 has a shape capable of covering at least the entire surface of the heat generating region 10a in the upper plate 10 of the heating chamber, has substantially the same thickness, and exerts an elastic force (restoring force) at least in the thickness direction. have.

As shown in FIG. 4 described above, the first heat insulating material 13 is formed with a plurality of openings. An opening formed in the center of the first heat insulating material 13 is a locking portion opening 13a in which a presser plate locking portion 10c projecting from the upper plate 10 of the heating chamber is accommodated. The first heat insulating material 13 also includes a terminal opening 13c through which the heater wire of the planar heater 11 passes.

[Pressing plate]
As shown in FIG. 4, the presser plate 14 attached to the upper plate 10 of the heating chamber is formed with a curved surface region 14a having a curved surface similar to the heat generation region 10a of the upper plate 10 of the heating chamber. . The presser plate 14 has a function of pressing the planar heater 11 against the heat generating region 10a of the upper plate 10 of the heating chamber through the first heat insulating material 13, and the entire surface of the planar heater 11 is tightly attached to the heat generating region 10a. I am letting

Corresponding to the heating chamber upper plate 10 in FIG. 5, the lateral cross section of the curved surface area 14a of the pressing plate 14 is substantially curved. Similarly, the vertical cross-section of the curved surface area 14a of the pressing plate 14 is also substantially curved. Accordingly, the curved surface region 14a of the pressing plate 14 has a three-dimensional curved surface with a concave surface on the heating chamber side (lower side). In this embodiment, the curvature of the curve in the horizontal direction of the curved surface region 14a is different from the curvature of the curve in the vertical direction of the curved surface region 14a, and the curvature in the horizontal direction is smaller than the curvature in the vertical direction. The curvature of the curve in the horizontal direction and the curve in the vertical direction may be substantially the same. As described above, the curved surface area 14a of the pressing plate 14 has the same curved surface as the heat generating area 10a of the upper plate 10 of the heating chamber.

As shown in FIG. 4, the holding plate 14 is provided with a terminal mounting portion 14e and a heater temperature detection portion 18. As shown in FIG. The heater temperature detector 18 is a part that detects the temperature of the area directly heated by the heat from the planar heater 11 . Terminal portions 24 having respective terminals of the inner heater 20 and the outer heater 21 of the planar heater 11 are attached to the terminal attachment portion 14e. Each terminal of the terminal section 24 is connected to a power supply section driven and controlled by the control section 7 in the cooking device.

The heater temperature detector 18 is arranged in a heating area (heating space) directly heated by the planar heater 11 . In this embodiment, the heating area (heating space) is formed directly above the inner heater 20 in the planar heater 11 and is directly heated by the inner heater 20 . Since the heater temperature detection unit 18 detects the temperature of the heating area directly heated by the inner heater 20, this heater temperature information and the information from the internal temperature detection unit 9 that detects the temperature inside the heating chamber 4 Based on the internal temperature information, the control unit 7 drives and controls heat sources of various heat cooking means used in the cooking device, such as the planar heater 11 .

[Heating control]
In the heating cooker of the present embodiment, a magnetron for generating microwaves is provided as another heating means for the planar heater unit 8 configured as described above, and the microwaves generated by the magnetron are transmitted through a waveguide. A microwave heating unit is provided that radiates from the antenna through. 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 that radiates microwaves such as circularly polarized waves from below the heating chamber 4. there is Further, the antenna has a structure capable of radiating microwaves having directivity, and is a structure capable of uniformly heating the inside of the heating chamber 4 by rotating the antenna.

In addition, as other heat cooking means in the heat cooker of the present embodiment, there is a steam heating unit that intensively injects steam into the heating chamber to heat and cook, and a hot air is circulated inside the heating chamber 4 to cook food. A hot air circulation unit for cooking may be provided. The steam heating unit has a water tank inside the main body 1, and is configured to intensively inject steam generated by heating water from the water tank to a high temperature by a steam heater of a boiler into the inside of the heating chamber 4. be. 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, the flat heater unit 8, the microwave heating unit, the steam heating unit, and the hot air circulation unit are provided as the heating cooking means in the heating cooker of the present embodiment, and each heating unit is provided according to the cooking content. A cooking means is selected and, depending on the case, several heating cooking times are driven and controlled simultaneously or in combination. In this embodiment, the heating control by the planar heater unit 8 will be mainly described.

A detection end (not shown) of the heater temperature detection unit 18 is arranged in a heating area (heating space) directly heated by the inner heater 20 of the planar 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. 11) as heater temperature information. In the control unit 7, based on the heater temperature information and the internal temperature information from the internal temperature detection unit 9 that detects the internal temperature of the heating chamber 4, the heating cooking operation is performed according to the cooking content set by the user. Controls the heat source and drive source in

In this embodiment, the heater temperature detector 18 is configured to detect the temperature of the heating area (heating space) directly heated by the inner heater 20 , so the controller 7 detects the temperature of the heater temperature detector 18 . Temperature control in the heating and cooking operation by the inner heater 20 can be performed based on accurate heater temperature information. In the present embodiment, as will be described later, the inner heater 20 having a large heater output is used to perform a speed heating operation in which the temperature of the heating chamber 4 is rapidly increased, so the heater temperature information is effective in this speed heating operation. .

In a conventional heating cooker, on/off control of the planar heater is performed based on the detected temperature inside the heating chamber so that the inside of the heating chamber reaches the set temperature. For this reason, in conventional heating cookers, the planar heater is once turned off long before the internal temperature reaches the set temperature, and after that, the planar heater is repeatedly turned on and off to maintain the internal temperature. was gradually brought closer to the set temperature. Therefore, it is difficult to set the internal temperature to the set temperature with high accuracy using the flat heater, and it takes time to reach the set temperature.

In the heating cooker of the present embodiment, the control section 7 performs temperature control in the heating cooking operation based on the heater temperature information and the internal temperature information from the heater temperature detecting section 18 . In particular, in the speed heating operation in which the temperature of the heating chamber 4 is rapidly raised 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. It is a configuration that is Therefore, the control unit 7 can rapidly heat the temperature of the heating area heated by the inner heater 20 to the set temperature, and can rapidly increase the internal temperature of the heating chamber 4. . Further, as will be described later, the inner heater 20 in this embodiment is configured to control the input current to a desired value, and is configured to set the heater output to a desired value. For this reason, after the internal temperature reaches the set temperature, the control unit 7 controls the input current to the inner heater 20 based on the internal temperature information and the heater temperature information so that the internal temperature can be accurately controlled. It is possible to maintain a high set temperature. As a result, in the heating cooker of the present embodiment, the time required for the internal temperature to reach the set temperature can be greatly shortened, and the internal temperature can be maintained at the set temperature with high accuracy for a predetermined period of time. It becomes possible.

[heat cooking operation]
FIG. 11 is an example of a circuit diagram for controlling the heat cooking means in the heat cooker of this embodiment. Heat sources in the heating means in the heating cooker of the present embodiment include the inner heater 20 and the outer heater 21 in the planar 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 in (see FIG. 11). A circulation fan motor 29 is used in the hot air circulation unit.

As shown in the circuit diagram of FIG. 11, 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 switching elements so as to be on/off controlled. It is also connected to an inverter circuit as a drive power source for a magnetron, which is microwave generating means in the microwave heating unit. In this embodiment, the triac 30 is used as a switching element for controlling the drive of the inner heater 20, and the current input to the inner heater 20 can be steplessly variably controlled to a desired value. The outer heater 21 uses a relay as a switching element for simply switching on/off. The outer heater 21 in the present embodiment will be described using a relay as a switching element that simply switches between ON and OFF. A configuration that allows variable control may be used.

A heating cooker has a predetermined rated power, and power exceeding the rated power cannot be used. In the heat cooker of this embodiment, it is possible to heat and cook using a plurality of heat cooking means, and the power consumption of the activated heat source etc. is always within the rated power. It is controlled by the control unit 7. . In particular, the planar heater unit 8 in the heating cooker of this embodiment performs characteristic control.

The heater 25 in the planar heater unit 8 comprises one heat source with the inner heater 20 and the outer heater 21. In this embodiment, the maximum heater output of the inner heater 20 is, for example, 900 W, The maximum heater output is 700W, for example. Therefore, the sum of the maximum heater outputs of the inner heater 20 and the outer heater 21 exceeds the rated power (1500 W=15 A (rated current)×100 V) in general households. In the heating cooker of this embodiment, as shown in FIG. 11, the inner heater 20 is driven and controlled by a triac 30 as a switching element. Therefore, the inner heater 20 can be driven with a heater output that can be steplessly varied within the range of 300 to 900 W according to the control signal input to the triac 30 .

Hereinafter, specific heat cooking operations using the heat cooking means in the heat cooker of the present embodiment will be described using examples.

In the case of using only the planar heater unit 8 to heat and cook the heating chamber 4 with substantially the entire surface of the ceiling wall as a heating element, for example, the inner heater 20 of the planar heater 11 is driven and controlled to a heater output of 700 W, and the outer heater 21 is turned on to provide a heater output of 700 W, the heating chamber 4 can be heated with a total heater output of 1400 W as the planar heater 11 .

When using the flat heater unit 8 and the microwave heating unit to heat and cook the heating chamber 4 with microwaves from below the ceiling wall and the bottom wall, for example, the inner heater 20 of the flat heater 11 is set to 900 W. The maximum heater output is set, the outer heater 21 is turned off (0 W), and the heater chamber 4 is heated from above with a total heater output of 900 W as the planar heater 11 . On the other hand, in the microwave heating unit used as another heat cooking means, the power consumption of the magnetron 28, for example, 450 W is used to heat the heating dish 6 stored in the heating chamber 4, and the heating dish 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 the power consumption of the magnetron 28 in the microwave heating unit is 550 W. You can heat and cook the food that has been cooked. As described above, even when cooking is performed using the flat heater unit 8 and the microwave heating unit, due to the power consumption below the rated power (1500 W = 15 A (rated current) x 100 V) in a general household , can perform the desired cooking operation.

In the heating cooker of the present embodiment, by using the flat heater unit 8 and the microwave heating unit, the central portion of the heating chamber 4 can be heated intensively. In the planar heater 11, the heater output per unit area is increased by 1.6 times by increasing the heater output from the conventional 650 W 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 this embodiment, 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, so that the central portion of the ceiling wall surface serves as a heating element. can intensively radiate heat to the central part of the heating chamber 4 . Further, by winding the heater wire at high density, the temperature rise of the upper plate 10 of the heating chamber can be made uniform.

On the other hand, the configuration of the present embodiment has a configuration in which microwaves (circularly polarized waves) can be intensively emitted from the antenna of the microwave heating unit from below the heating chamber 4 toward the central portion of the heating chamber 4. ing. A heating plate 6 on which food to be heated is placed is housed inside the heating chamber 4, and a heating element that generates heat by absorbing microwaves is embedded in the mounting surface of the heating plate 6. ing. As a result, the food on the mounting surface of the heating plate 6 is heated from below by the heating plate 6 heated by the heating element by the microwave heating unit, and the flat heater unit 8 heats the food on the ceiling wall. The central portion is heated, and heat radiation from the central portion is received from above and heated intensively. That is, the heating cooker of the present embodiment is configured so that the food on the heating dish 6 stored in the heating chamber 4 can be rapidly heated from above and below to a high temperature.

As described above, the heating cooker of the present embodiment has a configuration in which at least the flat heater is used as the heating cooking means so that the cooking can be efficiently performed within the rated power. In the heating cooker of the present embodiment, using a plurality of power devices whose total power consumption exceeds the rated power, the inside of the heating chamber can be rapidly started up at a desired high heat power to quickly heat and cook. have a configuration.

In addition, the heating cooker of the present embodiment has a configuration capable of speeding up the temperature rise in the chamber and at the same time maintaining the temperature in the chamber (the upper plate temperature of the heating chamber) at a constant temperature. The heating cooker of the present embodiment can set the internal temperature (heating chamber upper plate temperature) to the set temperature with high accuracy, and can shorten the time until the internal temperature reaches the set temperature. It becomes the structure which can achieve shortening of time.

INDUSTRIAL APPLICABILITY The heating cooker of the present invention has a structure capable of quickly raising the internal temperature to a desired temperature, shortens the cooking time, and becomes a cooking appliance with high market value.

REFERENCE SIGNS LIST 1 main body 2 door 3 handle 4 heating chamber 5 setting unit 6 heating plate 7 control unit 8 flat heater unit 9 internal temperature detection unit 10 heating chamber upper plate (ceiling wall)
10a heating area 10b honeycomb area 10c pressing plate engaging portion 11 planar heater 13 first heat insulating material 14 pressing plate 15 insulating sheet 16 heat shield plate 18 heater temperature detector (thermistor)
20 inner heater 21 outer heater 20a inner mica 21a outer mica 21a1 upper mica (frame detail mica)
21a2 Lower side mica (frame detail mica)
21a3 thick frame part mica 20b, 20b1, 21b, 21b1 heater wire 21c frame details 21d thick frame part 22 upper insulating material 23 lower insulating material 24 terminal part 25 heater 26 steam heater 27 rear heater 28 magnetron 29 circulation fan motor 30 triac 31 switch 40 notch hole

Claims (3)

a heating chamber for heating the food to be cooked;
A heating cooker comprising a planar heater that constitutes a heat source with an inner heater disposed on the ceiling wall of the heating chamber and an outer heater surrounding the inner heater,
The outer heater has a heater wire wound around the outer mica, and the inner heater has a heater wire wound around the inner mica,
The outer mica has a thick frame portion and a detailed frame portion,
A heater wire is laid substantially linearly along the longitudinal direction of the frame details,
A heating cooker further comprising upper mica covering an upper surface side of at least a portion of the heater wire laid on the frame details. 2. The heating cooker according to claim 1, wherein a plurality of heater wires are laid substantially linearly along the longitudinal direction of said frame details, and said plurality of heater wires are separated by said upper mica. A heater wire laid substantially linearly along the longitudinal direction of the frame detail and a part of the heater wire wound around the inner mica are arranged substantially parallel and close to each other, and the heater wires are arranged in the vicinity of the frame detail. 3. The heating cooker according to claim 1 or 2, which is spaced apart by .

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