Cooking device

Abstract

To cool heated air as much as possible and discharge it from an exhaust duct.SOLUTION: A heating cooker includes a heating chamber configured to heat an object to be cooked, a magnetron configured to supply microwaves to the heating chamber, a control board configured to control at least driving of the magnetron, and a blower fan configured to cool the magnetron and the control board, wherein air in the heating chamber and air cooled by the blower fan are discharged from an exhaust port of an exhaust duct disposed behind the heating chamber, and the exhaust duct includes a metal heat radiator disposed therein. Thus, the heated air can be cooled as much as possible and discharged from the exhaust duct.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present disclosure relates to a cooking appliance, and more particularly to a cooking appliance having an exhaust configuration to the outside of the appliance. [Background technology]

[0002] BACKGROUND ART There have been conventional cooking appliances that cool the control board, components, etc. of the cooking appliance and exhaust the air from an exhaust duct at the rear of the cooking appliance (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-8297 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional configuration, there is room for improvement in the configuration of the exhaust duct that discharges heated air to the outside of the machine.

[0005] The present disclosure is intended to solve the above-mentioned conventional problems, and has an object to cool heated air as much as possible before exhausting it from an exhaust duct. [Means for solving the problem]

[0006] In order to solve the above-mentioned conventional problems, the heating cooker of the present invention comprises a heating chamber for heating the food to be cooked, a magnetron for supplying microwaves to the heating chamber, a control board for controlling the operation of at least the magnetron, and a blower fan for cooling the magnetron and the control board, and the air inside the heating chamber and the air cooled by the blower fan are exhausted from the exhaust port of an exhaust duct installed at the rear of the heating chamber, and the exhaust duct has a metal heat dissipation section arranged inside. [Effects of the Invention]

[0007] The cooking appliance of the present invention can cool the air exhausted to the outside of the appliance through the exhaust duct as much as possible. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a front perspective view showing the appearance of a cooking device according to an embodiment of the present invention; [Figure 2] FIG. 1 is a perspective view showing a state in which the door of the cooking device according to the present embodiment is open; [Figure 3] FIG. 1 is a rear perspective view showing the appearance of the cooking device of the present embodiment; [Figure 4] FIG. 10 is a rear perspective view showing the cooking device of the present embodiment with the exhaust guide removed; [Figure 5] FIG. 1 is a front perspective view showing a state in which an outer cover of the cooking device according to the present embodiment is removed; [Figure 6] FIG. 1 is a partial vertical cross-sectional view of the cooking device of the present embodiment as seen from behind; [Figure 7] FIG. 1 is a partial vertical cross-sectional view of the cooking device of the present embodiment as viewed from the right side; [Figure 8] FIG. 1A is an external perspective view of an exhaust guide of a cooking device according to an embodiment of the present invention; [Figure 9] A circuit diagram for controlling the cooking means in the cooking device of this embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] A cooking device according to a first aspect of the present disclosure includes a heating chamber for heating food, a magnetron for supplying microwaves to the heating chamber, a control board for controlling the operation of at least the magnetron, and a blower fan for cooling the magnetron and the control board. In this cooking appliance, the air inside the heating chamber and the air cooled by the blower fan are exhausted from the exhaust port of an exhaust duct installed at the rear of the heating chamber, and the exhaust duct has a metal heat dissipation part inside, which allows the air exhausted outside the appliance from the exhaust duct to be cooled as much as possible.

[0010] A cooking appliance according to a second aspect of the present disclosure is the first aspect, wherein a first exhaust hole for exhausting air from the heating chamber is provided at the rear of the heating chamber, and a passage hole is provided in a part of the heat dissipation part facing the first exhaust hole, thereby making it possible to cool the air exhausted to the outside of the appliance from the exhaust duct as much as possible.

[0011] A cooking appliance according to a third aspect of the present disclosure is the second aspect, wherein a second exhaust hole is provided at the rear of the heating chamber to exhaust the air cooled by the blower fan, and the second exhaust hole is positioned inside the exhaust duct, thereby making it possible to cool the air exhausted to the outside of the appliance from the exhaust duct as much as possible.

[0012] In the cooking device according to a fourth aspect of the present disclosure, in the second aspect, the first exhaust hole is provided in a plurality of inclined positions at the rear of the heating chamber, and the through-hole is provided in a plurality of inclined positions at a protrusion protruding forward from the heat dissipation unit, which is inclined substantially parallel to the first exhaust hole. This makes it possible to cool the air exhausted to the outside of the cooking device from the exhaust duct as much as possible.

[0013] A cooking appliance according to a fifth aspect of the present disclosure is the cooking appliance according to the first or second aspect, wherein the heat dissipation part is made of aluminum, thereby making it possible to cool the air exhausted to the outside of the appliance through the exhaust duct as much as possible.

[0014] Hereinafter, as an embodiment of the cooking device of the present invention, a cooking device using at least a heater or a magnetron as cooking means will be described with reference to the accompanying drawings. Note that the cooking device of the present invention is not limited to the cooking device configuration described in the following embodiment, but includes cooking device configurations equivalent to the technical ideas described in the following embodiment.

[0015] The embodiments described below are examples of the present invention, and the configurations, functions, operations, etc. shown in the embodiments are merely examples and do not limit the present invention. Among the components in the following embodiments, components that are not described in the independent claims that represent the highest concepts are described as optional components.

[0016] (Embodiment 1) [Configuration of the main body and cooking means] Hereinafter, a cooking device according to the present embodiment of the present invention will be described with reference to the accompanying drawings. Fig. 1 is a perspective view showing the appearance of the cooking device according to the present embodiment. Fig. 2 is a perspective view showing the cooking device according to the present embodiment of Fig. 1 with the door open.

[0017] In this embodiment, the door 2 side of the cooking device body 1 is the front, the side opposite the door 2 of the cooking device body 1 is the rear, and the left and right sides in FIG. 1 are the left and right sides of the cooking device body 1, respectively.

[0018] As shown in Figures 1 and 2, the cooking appliance is configured so that the 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 grasps the handle 3 to rotate the door 2, thereby opening and closing the front opening of the heating chamber 4 up and down. The interior of the heating chamber 4 becomes substantially sealed when the door 2 is closed, and food to be cooked, which is an object to be heated and placed on the heating plate 6 and bottom wall 4a inside the heating chamber 4, is heated and cooked in a substantially sealed state.

[0019] As shown in Fig. 1, on the front of the cooking appliance, a setting unit 5 is provided on an upward-opening door 2, which has a dial-like knob and various setting buttons for setting various cooking conditions such as cooking temperature and cooking time. The setting unit 5 provided on the front of the cooking appliance also has a display unit that displays various cooking conditions and the heating state during cooking.

[0020] The cooking means in the cooker of this embodiment include a microwave heating unit that irradiates microwaves to heat food, in addition to the flat heater unit 8 (upper heater) in Fig. 5 and the lower heater 21 (sheathed heater) in Fig. 6. Alternatively, a steam heating unit that heats food with steam, and a hot air circulation unit that heats food by circulating hot air inside the heating chamber 4 may be used. The lower heater 21 is a sheathed heater in which a coiled nichrome wire serving as a heating element is threaded through a metal pipe, but it may also be a tubular lamp heater that emits infrared rays.

[0021] As shown in Fig. 6, a machine room is provided in the space between the recess 4b below the bottom wall 4a and the bottom plate 10. In this machine room, there are arranged a magnetron 31 which is an example of a heat source, an inverter board (inverter device) 32 which controls the output of the magnetron 31, devices (upper heater, lower heater, etc.) which realize the functions of the cooking device or a control board 30 which controls the inverter board 32, and a blower fan (cooling fan unit) 33 which generates cooling air to cool them. The machine room also functions as a heat-insulating space.

[0022] The microwave heating unit, which includes a magnetron 31, which is an example of a heating source, has an antenna (not shown) that radiates microwaves provided below the bottom wall 4a of the heating chamber 4, and the directional antenna radiates microwaves in a desired direction into the heating chamber 4. When a steam heating unit is provided, a water tank is provided inside the main body 1, and water from the water tank is heated to a high temperature by a boiler steam heater, and the generated steam is sprayed in a concentrated manner into the heating chamber 4. When a hot air circulation unit is provided, a rear heater provided on the rear side of the heating chamber 4 heats the air drawn in from the heating chamber 4, and the hot air is supplied into the heating chamber 4.

[0023] The cooker of this embodiment is provided with multiple cooking means such as various heaters and magnetrons, and the user can select the appropriate cooking means by selecting the desired cooking means or the cooking contents. The user places the food to be cooked in the heating chamber 4 of the cooker, closes the door 2, sets the cooking means and cooking contents in the setting unit 5, and presses the start button to start the cooking operation.

[0024] As shown in Fig. 2, the cooking device of this embodiment is configured so that a heating dish 6 on which an object to be heated is placed can be stored inside the heating chamber 4. The heating dish 6 can be placed on either the upper or lower level inside the heating chamber 4, and steps are formed on both side walls of the heating chamber 4 to allow the heating dish 6 to slide and support the heating dish 6. A heating element (not shown) is embedded in the placement surface of the heating dish 6. The heating element absorbs microwaves and generates heat, and ferrite or the like is used for the heating element.

[0025] In this embodiment, an example is described in which ferrite is embedded in the heating dish 6 as the heating element, but the heating element may be any element that absorbs microwaves and generates heat, and may be configured by applying the heating element to the back surface of the heating dish 6. Furthermore, the main material of the heating dish 6 may be any material that has excellent thermal conductivity, and may be configured from metal or ceramic.

[0026] In this embodiment, the heating dish 6 is supported by a step on the side wall of the heating chamber 4. However, it may be hung from the ceiling wall, or may be provided with legs protruding downward on the heating tray 6 and placed on the bottom wall of the heating chamber 4.

[0027] The antenna that radiates microwaves into the heating chamber 4 is disposed directly below the approximate center of the bottom wall 4a of the heating chamber 4. The antenna in this embodiment has directivity in the microwave radiation direction and is configured to radiate circularly polarized waves directly above the antenna. Therefore, the antenna in this embodiment is provided with a rotation mechanism (not shown) so that the antenna's radiation port rotates to radiate microwaves uniformly inside the heating chamber 4, and is also configured to radiate circularly polarized waves to the heating element of the heating plate 6 located directly above the antenna for dielectric heating. Therefore, the object to be heated placed on the bottom wall 4a of the heating chamber 4 is microwave-heated by microwaves that are supplied into the heating chamber 4 after passing through the bottom wall 4a from the antenna.

[0028] The bottom wall 4a of the heating chamber 4 is made of a material (e.g., ceramic) that transmits microwaves from the antenna, and the other walls of the heating chamber 4, namely the side walls, back wall 4c, and ceiling wall, are made of steel or aluminum-plated stainless steel (SUS). Each wall surface may be coated with a non-stick coating layer made of, for example, fluororesin or silicone resin. By forming such a coating layer, it is possible to prevent the adhesion of dirt such as oil and grease scattered during cooking and cooking residue, and even if dirt does adhere, it is easy to wipe off the dirt.

[0029] Furthermore, a coating layer with a self-cleaning function may be formed on each wall surface of the heating chamber 4, which decomposes and automatically cleans off grease scattered during cooking when heated during cooking. Methods for imparting a self-cleaning function to the coating layer include, for example, blending a manganese oxide-based catalyst species that promotes oxidative decomposition into the coating layer, or adding platinum, which has a significant effect on oxidative decomposition at low temperatures, or palladium, which is highly active in the medium to high temperature range. Furthermore, a method of adding cerium, which has an adsorption property, may also be used.

[0030] As described above, the object to be heated (food) placed on the heating plate 6 stored inside the heating chamber 4 is heated and cooked by the heating plate 6, which has reached a high temperature due to the heat from the heating element that is dielectrically heated by microwaves.In this embodiment, however, the configuration is such that the top 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 upper part of the ceiling wall of the heating chamber 4, and the configuration is such that mainly the bottom surface of the object to be heated (food) placed on the bottom wall 4a is heated by the lower heater 21 provided below the bottom wall 4a of the heating chamber 4.

[0031] [Exhaust system and exhaust route configuration] FIG. 3 is a rear perspective view showing the appearance of the cooking device of this embodiment, and FIG. 4 is a rear perspective view showing the cooking device of this embodiment with an exhaust guide removed.

[0032] 3, a back panel 22 is formed on the back of the main body 1 so as to protrude rearward, and constitutes most of the back of the main body 1. A resin exhaust duct 23 is installed on the upper part of the back panel 22, and air from the heating chamber 4 and air that has cooled the magnetron 31, inverter board 32, and control board 30 by the blower fan 33 are exhausted from the exhaust port 23a on the upper surface of the exhaust duct 23.

[0033] Further, a rear projection 24 is formed at the bottom of the back plate 22 by projecting the back plate 22 further rearward, and a rear projection exhaust port 24a is provided at the top of the rear projection 24, so that the air that has cooled the magnetron 31, inverter board 32, and control board 30 is exhausted by the blower fan 33. Even if the rear of the cooking appliance is tightly attached to the wall of the house, a gap is formed between the back plate 22 and the wall of the house due to the rear projection 24, so that the rear projection exhaust port 24a The exhaust air can be discharged upwards as it is.

[0034] In Figure 4, at the rear of the heating chamber 4, at the position above the back panel 22 where the exhaust duct 23 has been removed, a plurality of first exhaust holes 25 through which air passes from the heating chamber 4 are provided at an angle. In this embodiment, five first exhaust holes 25 are provided on the left side (three on the top and two on the bottom) and five on the right side (three on the top and two on the bottom), but the number of first exhaust holes 25 provided on each side may be approximately 2 to 8.

[0035] Two oblong second exhaust holes 26 are provided at an angle, one on each side (outside) of the first exhaust hole 25. The number of second exhaust holes 26 may be about 2 to 8 circular holes on each side, similar to the first exhaust holes 25, or multiple elliptical holes on each side.

[0036] Air from the heating chamber 4 is discharged into the exhaust duct 23 through the first exhaust hole 25, and air that has been cooled by the blower fan 33 to cool the magnetron 31, inverter board 32, and control board 30 is discharged into the exhaust duct 23 through the second exhaust hole 26.

[0037] The first exhaust hole 25 and the second exhaust hole 26 are usually covered by the exhaust duct 23, which is attached with screws or the like.

[0038] Fig. 5 is a perspective view showing the state in which the outer cover is removed from the main body 1 of the cooking device of this embodiment. As shown in Fig. 5, a flat heater unit 8 is provided on the ceiling side of the main body 1 of the cooking device, i.e., in the part including the ceiling wall of the heating chamber 4. As shown in Fig. 5, the upper part of the heating chamber 4 in the cooking device is configured with the flat heater unit 8.

[0039] An internal temperature detection unit 9, such as a thermistor, is provided near the right rear corner of the heating chamber 4 as internal temperature detection means for detecting the internal temperature inside the heating chamber 4. Internal temperature information detected by the internal temperature detection unit 9 is transmitted to the control unit of the control board 30 and used to control various heating cooking operations. Although the thermistor is provided near the right rear corner of the heating chamber 4, it may be provided anywhere inside the heating chamber 4 where the internal temperature can be detected, such as the left rear corner, the right front corner, or the left front corner.

[0040] 5, infrared sensor 28 that detects the temperature of the object to be heated inside the heating chamber 4 is installed on the outer side wall of heating chamber 4, and ventilation duct 27 is installed to send air to the main body of infrared sensor 28. Infrared sensor 28 is installed so as to face the inside of heating chamber 4 through a hole opened in the side wall of heating chamber 4, in order to detect the temperature inside heating chamber 4 with its lens surface. This ventilation duct 27 is formed so that air flows from the bottom of the outer side wall of heating chamber 4 to infrared sensor 28, and air that has cooled magnetron 31, inverter board 32, and control board 30 by blower fan 33 passes through ventilation duct 27 (solid line arrow in FIG. 5) and is sent to infrared sensor 28 (solid line arrow in FIG. 5).

[0041] Furthermore, air that has entered the heating chamber 4 through a hole in the side wall of the heating chamber 4 that the lens of the infrared sensor 28 faces is sent to the rear side and exhausted from the first exhaust hole 25 .

[0042] 6 is a partial vertical cross-sectional view of the cooking device of this embodiment as seen from the rear. The arrangement of the control board 30, magnetron 31, inverter board 32, and blower fan 33 has already been described above, and the control unit of the control board 30 drives the blower fan 33 to rotate, thereby cooling the magnetron 31 located in front of the blower fan 33. By rotating the blower fan 33, the inverter board 32 and the control board 30 located to the right of the blower fan 33 are cooled.

[0043] 7 is a partial vertical cross-sectional view of the right side of the cooking device of this embodiment. After cooling the magnetron 31, inverter board 32, and control board 30 by the blower fan 33, the air flows from the machine compartment through the lower part of the main body 1 as indicated by arrow Q, passes through the gap between the back panel 22 and the rear wall 4c of the heating chamber 4, and is discharged into the exhaust duct 23 from the second exhaust hole 26.

[0044] Furthermore, the air from the heating chamber 4 flows as indicated by the arrow P and is discharged into the exhaust duct 23 from the first exhaust hole 25.

[0045] [Exhaust duct configuration] 8A and 8B are (a) an external perspective view and (b) an internal perspective view of the exhaust guide of the cooking device of this embodiment. In Fig. 8A, air is exhausted from exhaust port 23a at the top of exhaust duct 23, and air that has cooled magnetron 31, inverter board 32, and control board 30 by blower fan 33 and air from heating chamber 4 are mixed in exhaust duct 23 and then exhausted from exhaust port 23a.

[0046] 8(b), inside exhaust duct 23 (inner surface side), metal heat dissipation section 23c is disposed (attached) to the inner surface of the resin duct, and heat dissipation section 23c is formed with protrusion 23c3 that protrudes forward. This protrusion 23c3 not only increases the strength of heat dissipation section 23c but also increases the surface area of ​​heat dissipation section 23c when air comes into contact with heat dissipation section 23c, thereby cooling the air. Heat dissipation section 23c is preferably made of aluminum or stainless steel, which are rust-resistant, but aluminum, in particular, has high heat dissipation properties and is inexpensive to procure.

[0047] Furthermore, a protrusion 23c1 extends diagonally upward and forward from the lower portion of the vertical surface of the heat dissipation portion 23c, including the protrusion 23c3. The protrusion 23c1, which is part of the heat dissipation portion 23c, is provided with a plurality of passage holes 23c2. The protrusion 23c1 faces the first exhaust hole 25 provided in the upper portion of the back plate 22. The surface of the protrusion 23c1 on which the passage holes 23c2 are provided and the surface on which the first exhaust hole 25 is provided are parallel to each other. Note that "parallel" here means that the surfaces are approximately parallel, and they may be offset from a parallel arrangement by approximately 10 degrees. In this embodiment, multiple (15) passage holes 23c2 are provided in the left-right direction, but the number may be approximately 10 to 20. The amount of air or steam discharged can also be freely controlled by changing the number of ventilation holes.

[0048] Furthermore, in this embodiment, protrusion 23c1 is provided opposite first exhaust hole 25 provided in the upper part of back plate 22, but protrusion 23c1 does not face second exhaust hole 26 provided in the upper part of back plate 22. However, protrusion 23c1 may be extended in the left-right direction so as to face second exhaust hole 26.

[0049] Additionally, louvers 23b provided at the top of exhaust duct 23 are arranged with an inclination that rises to the right from the bottom of louvers 23b upward so that air flows diagonally upward to the right when viewed from the front of main body 1. This prevents the air exhausted from exhaust duct 23 from directly hitting the house wall behind or above the cooking appliance, thereby minimizing corrosion of the house wall.

[0050] During the heating operation of the cooking device, the air containing hot air discharged from the first exhaust hole 25 of the heating chamber 4 comes into contact with the protrusion 23c1 in the exhaust duct 23 and is cooled, and then passes through the passage hole 23c2. The air that has passed through the passage hole 23c2 also comes into contact with the protrusion 23c3 and is cooled, and The cooled air is mixed with the air that has cooled the magnetron 31, control board 30, etc. and discharged from the second exhaust hole 26, where it is cooled, and is then discharged from the exhaust port 23a. The air that has cooled the magnetron 31, control board 30, etc. and that has been discharged from the second exhaust hole 26 is often at a lower temperature than the air containing hot air that has been discharged from the first exhaust hole 25, so the air that is discharged from the exhaust port 23a is discharged in a state that is as cool as possible compared to the air that has been discharged into the exhaust duct 23 from the first exhaust hole 25. This prevents users from getting burned by touching the area around the exhaust port 23a of the exhaust duct 23, and minimizes corrosion of the walls of the house.

[0051] [Heating control] In the cooking device of this embodiment, a microwave heating unit is provided as another cooking means in addition to the planar heater unit 8 configured as described above. The microwave heating unit includes a magnetron that generates microwaves and radiates the microwaves generated by the magnetron from an antenna via a waveguide. The antenna that radiates microwaves to the heating chamber 4 is disposed below the bottom wall of the heating chamber 4 and is configured to radiate microwaves such as circularly polarized waves from below toward the heating chamber 4. The antenna is configured to radiate directional microwaves, and can be rotated to uniformly heat the interior of the heating chamber 4.

[0052] Other cooking means in the cooker of this embodiment may include a steam heating unit that intensively injects steam into the heating chamber to cook food, and a hot air circulation unit that circulates hot air inside the heating chamber 4 to cook food. 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 with a boiler steam heater into the heating chamber 4. The hot air circulation unit is configured to heat air sucked from the heating chamber 4 with a rear heater provided on the rear side of the heating chamber 4, and supply hot air into the heating chamber 4.

[0053] As described above, the heating and cooking means in the heating cooker of this embodiment include a flat heater unit 8, a microwave heating unit, a steam heating unit, and a hot air circulation unit, and each heating and cooking means is selected according to the cooking contents, and in some cases, multiple heating and cooking times are driven and controlled simultaneously or in combination.

[0054] The detection ends of the heater temperature detection units (not shown) are respectively arranged in the heating areas (heating spaces) directly heated by the upper heater and the lower heater 21. The heater temperature detection units detect the temperatures of the spaces directly heated by the upper heater and / or the lower heater 21, and transmit the detected temperatures as heater temperature information to the control unit on the control board (see FIG. 9). The control unit controls the heat source and drive source for the heating cooking operation according to the cooking contents set by the user, based on the heater temperature information as well as internal temperature information from the internal temperature detection unit 9, which detects the internal temperature of the heating chamber 4.

[0055] In this embodiment, the heater temperature detection unit is configured to detect the temperature of the heating area (heating space) that is directly heated by the upper heater and lower heater 21, so the control unit can control the temperature in the heating cooking operation by the upper heater and lower heater 21 based on highly accurate heater temperature information from the heater temperature detection unit. In this embodiment, a speed heating operation is performed in which the temperature of the heating chamber 4 is rapidly increased by the upper heater, which has a large heater output, so the heater temperature information is effective in this speed heating operation.

[0056] [Cooking operation] 9 is an example of a circuit diagram for controlling the cooking means in the cooking device of this embodiment. The heat source in the cooking means in the cooking device of this embodiment is a flat heater unit. There are an upper heater in the unit 8, a lower heater 21 installed at the bottom of the heating chamber 4, and a magnetron in the microwave heating unit.

[0057] As shown in the circuit diagram of Fig. 9, the upper heater and lower heater 21 are connected to switching elements so that they can be controlled to be on or off. They are also connected to an inverter board (inverter circuit) as a driving power source for a magnetron, which is a microwave generating means in the microwave heating unit. In this embodiment, a triac may be used as a switching element for driving and controlling the upper heater, and the current input to the upper heater may be configured to be continuously variable to a desired value.

[0058] The lower heater 21 also uses a relay as a switching element that simply switches on and off. Note that, although the lower heater 21 in this embodiment is described as using a relay as a switching element that simply switches on and off, it may also be configured to be able to steplessly variably control the input power by using a triac as a switching element, as with the upper heater.

[0059] A cooking device has a predetermined rated power, and power above that rated power cannot be used. The cooking device of this embodiment is configured to be capable of cooking using multiple cooking means, and the control unit controls the power consumption of activated heat sources, etc. so that they always remain within the rated power.

[0060] In this embodiment, the maximum heater output of the upper heater is, for example, 900 W, and the maximum heater output of the lower heater 21 is, for example, 700 W. Therefore, the total maximum heater output of the upper heater and the lower heater 21 exceeds the rated power (1500 W = 15 A (rated current) × 100 V) in a typical home. In the cooking appliance of this embodiment, if the upper heater is configured to be driven and controlled by a triac as a switching element, the upper heater can be driven at a heater output that can be steplessly varied within a range of 300 to 900 W by a control signal input to the triac.

[0061] Hereinafter, a specific cooking operation using the cooking means in the cooking device of the present embodiment will be described with reference to examples.

[0062] When using only the flat heater unit 8 to heat and cook the heating chamber 4 with almost the entire ceiling wall as a heating element, for example, the upper heater can be controlled to operate at a heater output of 700 W and the lower heater 21 can be turned on to provide a heater output of 700 W, thereby heating the heating chamber 4 with a total heater output of 1400 W.

[0063] When using the flat heater unit 8 and the microwave heating unit to heat and cook the heating chamber 4 with microwaves from the ceiling wall and the underside of the bottom wall, for example, the upper heater is set to a maximum heater output of 900 W and the lower heater 21 is set to the off state (0 W), and the heating chamber 4 is heated from above with a total heater output of 900 W. On the other hand, in a microwave heating unit used as another heating and cooking means, the magnetron or the like can use power consumption of, for example, 450 W to heat the heating plate 6 stored in the heating chamber 4, and food placed on the heating plate 6 can be cooked.

[0064] As another example, food placed on the heating tray 6 can be cooked with the lower heater 21 in the off state (0 W), the upper heater at a heater output of 430 W, and 550 W consumed by the magnetron and other components of the microwave heating unit. As described above, even when cooking using the flat heater unit 8 and the microwave heating unit, the rated power (1500 W = 15 A (rated current) × 100 V) in a typical household is used. ) The desired cooking operation can be performed with the following power consumption.

[0065] On the other hand, in the configuration of this embodiment, microwaves (circularly polarized waves) can be radiated intensively from the antenna of the microwave heating unit from below the heating chamber 4 toward the center of the heating chamber 4. Inside the heating chamber 4, a heating plate 6 is stored on which food to be heated is placed, and a heating element that absorbs microwaves and generates heat is embedded in the placing surface of this heating plate 6.

[0066] As a result, the food on the placing surface of the heating plate 6 is heated from below by the heating plate 6 heated by the heating element in the microwave heating unit, and the ceiling wall is heated by the flat heater unit 8, and this heat radiation is received from above and heated intensively. In other words, the heating cooker of this embodiment is configured to be able to rapidly heat the food on the heating plate 6 stored in the heating chamber 4 to high temperatures from above and below.

[0067] As described above, the cooking device of this embodiment has a configuration that allows cooking to be performed efficiently using a heater as cooking means within the rated power. The cooking device of this embodiment has a configuration that allows the interior of the heating chamber to be rapidly heated to a desired high heat level to perform cooking quickly using multiple power appliances whose total power consumption exceeds the rated power.

[0068] The cooking device of this embodiment is also configured to be able to quickly increase the temperature inside the cooking chamber and at the same time maintain the temperature inside the cooking chamber (the temperature of the upper plate of the cooking chamber) at a constant temperature. The cooking device of this embodiment is configured to be able to accurately set the temperature inside the cooking chamber (the temperature of the upper plate of the cooking chamber) to a set temperature and shorten the time it takes for the temperature inside the cooking chamber to reach the set temperature, thereby achieving a reduction in cooking time. [Industrial Applicability]

[0069] As described above, according to the cooking device of the present disclosure, heated air can be cooled as much as possible before being exhausted from the exhaust duct, and therefore the present disclosure is useful in microwave ovens, toasters, etc. that are capable of oven heating, grill heating, and steam heating. [Explanation of symbols]

[0070] 1 Main unit 2 doors 3 handle 4 Heating cabinet 4a Bottom wall 4b Recess 4c back wall 5. Settings 6 Heating Plate 8 Flat heater unit (upper heater) 9. Temperature detection unit inside the cabinet 10 Bottom plate 21 Lower heater (heater part) 22 Back plate 23 Exhaust duct 23a Exhaust port 23b Louver 23c Heat dissipation part 23c1 Convex part 23c2 passing hole 23c3 Protrusion 24 Rear protrusion 24a Rear convex exhaust port 25 First exhaust hole 26 Second exhaust hole 27 Ventilation duct 28 Infrared sensor 30 Control board 31 Magnetron (microwave heating unit) 32 Inverter board (microwave heating unit) 33 Blower fan (cooling fan unit)

Claims

1. The cooking apparatus comprises a heating chamber for heating food, a magnetron for supplying microwaves to the heating chamber, a control board for controlling the operation of at least the magnetron, and a blower fan for cooling the magnetron and the control board, A cooking device in which the air in the heating chamber and the air cooled by the blower fan are exhausted from an exhaust port of an exhaust duct installed at the rear of the heating chamber, The cooking device, wherein the exhaust duct has a metal heat dissipation part disposed therein.

2. 2. The cooking device according to claim 1, wherein a first exhaust hole for exhausting air from the heating chamber is provided at the rear of the heating chamber, and a passage hole is provided in a part of the heat dissipation section opposite the first exhaust hole.

3. 3. The cooking device according to claim 2, wherein a second exhaust hole for exhausting the air cooled by the blower fan is provided at the rear of the heating chamber, and the second exhaust hole is arranged so as to be positioned inside the exhaust duct.

4. The heating cooker according to claim 2, wherein the first exhaust holes are provided in a plurality of inclined positions at the rear of the heating chamber, and the through holes are provided in a plurality of convex portions that protrude forward of the heat dissipation portion and are inclined approximately parallel to the first exhaust holes.

5. 3. The cooking device according to claim 1, wherein the heat dissipation portion is made of aluminum.

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