JP2011149607A - Heating cooking apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem in conventional heating cooking apparatuses that because ventilation amount of a cooling fan is increased (Ex, operation is increased from 50% to 75%. ) when a temperature in a heating chamber becomes a predetermined temperature (Ex, 280°C), the heating chamber is entirely cooled for the increased ventilation amount of the cooling fan, resulting in taking more or less long in increasing a temperature in the heating chamber and making a setting temperature more or less low in the heating chamber, or the like. <P>SOLUTION: On a bottom surface of the heating chamber 2, there is a notch near a wave guide tube 9 and magnetron 10. A steam heater section 14 that is covered by a draw part 17 is covered by a bottom heat insulation plate 18. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to component protection, oven performance improvement and safety in the incorporation of a heating cooker.

  Conventionally, in this type of cooking device, when the temperature of the heating chamber reaches a preset temperature (for example, 280 ° C.), the amount of air blown by the cooling fan is increased (for example, operation from 50% to 75%). Thus, there is one that suppresses the influence of the installation form (see, for example, Patent Document 1).

JP 2008-51447 A

  However, in the conventional configuration, when the temperature of the heating chamber reaches a preset temperature (for example, 280 ° C.), the air flow rate of the cooling fan is increased (for example, operation from 50% to 75%). For this reason, the entire heating chamber is cooled by the increase in the amount of air blown by the cooling fan, so that the heating chamber temperature rise time is somewhat delayed, and the set temperature of the heating chamber is somewhat lowered.

  This invention solves the said conventional subject, and aims at provision of the heating cooker which can ensure the protection of the components in integration, oven performance improvement, and safety | security.

  In order to solve the conventional problems, a heating cooker according to the present invention includes a heating chamber for storing food, high-frequency heating means for heating the food at high frequency, a heater for heating the food, and steaming the food. A steam heater for heating; a blower for cooling parts; a control device for controlling the air volume of the blower; and a bottom plate comprising a control device for controlling the air volume of the blower and the blower; A heat insulating plate is provided in the space between the bottom surface of the chamber and the bottom plate and covers the entire bottom surface of the heating chamber.

  As a result, it is possible to secure the protection of the parts, the improvement of the oven performance and the safety in the incorporation of the cooking device.

  ADVANTAGE OF THE INVENTION According to this invention, the cooking-by-heating machine which can ensure the protection of components in the integration of a cooking-by-heating machine, oven performance improvement, and safety | security is implement | achieved.

The perspective view seen from diagonally after removing the exterior part of the heat cooking in Embodiment 1 of this invention The perspective view which looked from diagonally under the exterior part and bottom part of heat cooking in Embodiment 1 of this invention, and removed the heat insulation board bottom The perspective view which looked from diagonally under the exterior part and bottom part of the heat cooking in Embodiment 1 of this invention The perspective view which looked from diagonally after removing the exterior part and oven unit of the heat cooking in Embodiment 1 of this invention The perspective view which removed the exterior part and oven unit of the heat cooking in Embodiment 1 of this invention, and looked under the heat insulation board External appearance perspective view which looked at cooking in Embodiment 1 of this invention from diagonally behind External appearance perspective view which looked at the cooking in Embodiment 1 of this invention from diagonally downward The perspective view which removed the exterior part and oven unit of the heat cooking in Embodiment 1 of this invention, and looked under the heat insulation board The perspective view which removed the exterior part of the cooking-by-heating machine in Embodiment 2 of the present invention, and saw it upside down diagonally

  The first invention is a heating chamber for storing food, high-frequency heating means for heating the food at high frequency, a heater for heating the food, a steam heater for steam-heating the food, and a blower for cooling parts. And a control device that controls the air volume of the blower, and a bottom plate that includes the blower and a control device that controls the air volume of the blower, in the bottom surface of the heating chamber and the space of the bottom plate, The heat insulation board which covers the whole bottom face of the said heating chamber is provided. Thereby, since heat release from the bottom surface of the heating chamber can be suppressed, the rise time of the heating chamber temperature can be shortened.

  And since the ventilation volume of a cooling fan does not change, the fall of the preset temperature of the heating chamber 2 does not occur. In addition, since the heat conduction rate of the heater can be reduced by the amount of heat released from the bottom of the heating chamber, the temperature of the cooling air flowing between the main body and the outer shell can be lowered, so the temperature of the components on the bottom plate and the exhaust cover The wall temperature can be lowered by reducing the exhaust temperature exhausted from the wall. It is possible to secure the protection of the parts, the improvement of the oven performance and the safety in the installation form of the heating cooker.

  In the second aspect of the present invention, a throttle portion for receiving the molten metal of the steam heater is provided substantially rearward under the heat insulating plate. Thereby, even if the steam heater is melted, it is received by the throttle portion, so that the components on the bottom plate are not damaged, and the safety can be improved.

  In a third aspect of the invention, a temperature switch is provided at a position where a heat source partitioned by a slit is sensed substantially rearward under the heat insulating plate. Thereby, it does not operate | move by normal use, but it can operate | move reliably at the time of abnormal use, and can be made safe.

  In a fourth aspect of the invention, a substantially L-shaped hook portion formed by cutting and raising is provided under the heat insulating plate. As a result, the bottom plate unit can be properly fixed by the hooking portion, so that the parts can be replaced and confirmed efficiently at the time of service.

  According to a fifth aspect of the present invention, a projecting portion that closes the hole of the waveguide is formed substantially at the center under the heat insulating plate. Thereby, since the electromagnetic wave leakage from the hole of a waveguide can be reduced, safety can be improved.

  In a sixth aspect of the present invention, the side surface under the heat insulating plate is made wider than the bottom surface of the heating chamber to receive water from the heating chamber. Accordingly, by properly receiving the water from the heating chamber, it can be prevented from being applied to the electrical components in the bottom plate unit, so that safety can be improved.

  According to a seventh aspect of the present invention, a flange or a constricted portion is provided in the vicinity of the end face or notch portion under the heat insulating plate so that the water that does not spill out from the heating chamber does not spill onto the bottom plate. Thereby, even if water permeates into the heat insulating plate, it can be prevented from being applied to the electrical components in the bottom plate unit, and thus safety can be improved.

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

(Embodiment 1)
FIG. 1 is a perspective view of the heating cooker according to the first embodiment of the present invention with the exterior portion removed and seen obliquely from the rear, and FIG. FIG. 3 is a perspective view of the heating cooker according to the present invention as viewed from obliquely below with the exterior and bottom portions removed.

  1, 2, and 3, a heating chamber 2 is provided inside the main body 1 of the heating cooker, and a door 3 that can be freely opened and closed is provided in front of the heating chamber 2. An upper heater unit 4 is provided on the upper surface of the heating chamber 2, and the upper heater unit 4 includes a tubular upper heater (not shown) and is covered with a heat insulating plate wafer 5. A circulation fan heater unit 6 is provided on the rear surface of the heating chamber 2. The circulation fan unit 6 includes a sheathed heater 7 and is covered with a heat insulating plate 8.

  A magnetron 10 is attached to the right center of the lower surface of the heating chamber 2 via a waveguide 9. An antenna motor mounting plate 11 is attached to the waveguide 9, and the antenna motor 12 is screwed to the antenna motor mounting plate 11.

  The steam heater 14 is attached to the steam heater mounting plate 13 so as to be in close contact with the bottom surface of the water receiving portion for generating steam in the heating chamber 2 on the right rear side of the lower surface of the heating chamber 2. On both side surfaces of the heating chamber 2, there are a heat insulating plate 15 and a heat insulating plate cover 16 that cover the entire side surface of each. On the bottom surface of the heating chamber 2, there are notches in the vicinity of the waveguide 9 and the magnetron 10, and the steam heater 14 is covered with a heat insulating plate shita 18 having a throttle portion 17 shaped to cover the steam heater 14. ing. Further, the heat insulating plate shita 18 is configured to cover the lower portions of the heat insulating plate bar 15 and the heat insulating plate cover 16 on both sides of the heating chamber 2, respectively.

  A temperature switch 19 for detecting an abnormal operation of the steam heater 14 is attached in the vicinity of the steam heater 14 portion of the heat insulating plate 18. Further, on the left side, there is a substantially L-shaped cut-and-raised part 20, and on the right side there is an upwardly convex restricting part 21, and the central left waveguide 9 has a hole 22 provided in the waveguide 9. There is provided a projection 23 for closing. Below the heating chamber 2, a bottom plate unit 24 that also serves as an outer shell of the bottom surface is configured.

  FIG. 4 is a perspective view of the heating cooker according to the present invention as viewed obliquely after removing the exterior and the oven unit.

  In FIG. 4, the bottom plate unit 24 has an inverter cooling fan unit 26 that cools the inverter unit 25 on the left side, and a magnetron cooling fan unit 27 that cools the magnetron 10 on the right side. A control unit 28 for controlling the operation of the heating, steam heating and cooling fans is provided.

  FIG. 5 is a perspective view of the heat cooking device according to Embodiment 1 of the present invention, with the exterior portion and the oven unit removed, and a bottom view of the heat insulating plate.

  In FIG. 5, the lower heat insulating plate 17 has a throttle portion 17 shaped to cover the steam heater 14 on the right rear side. Further, a substantially L-shaped cut-and-raised portion 20 is provided on the left rear side, and an upwardly convex restricting portion 21 is provided on the right side thereof. Furthermore, a projection 23 that closes the hole 22 provided in the waveguide 9 is provided on the waveguide portion on the left side of the center.

  FIG. 6 is an external perspective view of the heating cooker of the present invention viewed obliquely from behind, and FIG. 7 is an external perspective view of the heating cooker of the present invention viewed obliquely from below.

  6 and 7, the main body 1 of the heating cooker is covered with a body 31 and a back plate 32, and an exhaust cover 33 is provided on the upper portion of the back plate 32. The hot air from the inside of the main body 1 of the vessel is exhausted diagonally forward. The bottom plate 34 of the bottom plate unit 24 is provided with an intake port 35 for the inverter cooling fan unit 26 on the left rear side and an intake port 36 for the magnetron cooling fan unit 27 on the right rear side.

  Next, operation and action will be described taking oven cooking as an example.

  In FIG. 1 to FIG. 7, food is put into the heating chamber 2, the heating mode (here, oven) and time are set by the operation key (not shown) of the operation unit below the door 3, and then the start key When the oven cooking is started by pressing (not shown), the upper heater unit 4 or the circulation fan heater unit 6 is energized, and the heating chamber has a heating control pattern programmed in the microcomputer (not shown) of the control unit 28. 2 is heated. The temperature of the heating chamber 2 is detected at any time by a thermistor (not shown) provided at the right rear when viewed from the front of the heating chamber 2, and temperature information is sent to a microcomputer (not shown) of the control unit 28. The energization of the unit 4 or the circulation fan heater unit 6 is turned on and off, and heated to a set temperature. When the set time is complete, the heating operation is stopped.

  On the other hand, when cooking is started, after a while, a sirocco fan (not shown) of the inverter cooling fan unit 26 provided in the bottom plate unit 24 rotates, and the inverter cooling fan unit provided in the bottom plate 34 of the bottom plate unit 24. The cool air outside the main body 1 is introduced from the air inlet 35a for 25, and is blown to the control unit 28 from the air blowing port 41 of the inverter cooling fan unit 26 and the air blowing port 42 and air blowing port 43 of the inverter unit 25, 28 electrical components are cooled.

  After that, it passes through the heat insulating plate mighs 15 on both sides of the heating chamber 2, the heat insulating plate cover 16, and the heat insulating plate 8 after the circulation fan heater unit 6, and is exhausted diagonally forward from the louver opening (not shown) of the exhaust cover 33. The The hot air in the heating chamber 2 is exhausted from a punching hole (not shown) provided in the heating chamber 2, and then exhausted through the exhaust guide 44 to the upper left part of the heat insulating plate 9. After merging with the exhaust air described above, the air is exhausted obliquely forward and upward from a louver opening (not shown) of the exhaust cover 33.

  Here, when the cooking device described above is used in a so-called built-in state in which the left, right, rear, and upper sides are surrounded by a wooden wall, so-called built-in state, the hot air of the main body 1 is trapped in the wooden wall. The air temperature between the outside of the main body 1 and the wooden wall becomes higher. As a result, the intake air temperature sucked from the intake air outlet 35 for the inverter cooling fan unit 26 provided on the bottom plate 34 of the bottom plate unit 24 naturally increases, and the cooling of the components in the bottom plate unit 24 deteriorates, and the exhaust cover The exhaust temperature exhausted from 33 louver openings (not shown) is also increased, and the wood wall temperature is also deteriorated.

  Conventionally, when the temperature of the heating chamber 2 reaches a preset temperature (for example, 280 ° C.), the air blowing amount of the inverter cooling fan unit 26 is increased (for example, 75% operation from the maximum capacity of 50% operation in normal operation). Although measures are taken, there are effects such as the start-up time of the heating chamber 2 being somewhat delayed or the set temperature of the heating chamber 2 being somewhat lower.

Therefore, in the present embodiment, the heat release from the bottom surface of the heating chamber 2 can be suppressed by providing the heat insulating plate heater 18 that covers the entire bottom surface of the heating chamber 2, so that the startup time of the heating chamber 2 can be shortened. . Moreover, since the air flow rate of the inverter cooling fan unit 26 is not changed, the set temperature of the heating chamber 2 does not decrease. In addition, since the heat release rate from the bottom surface of the heating chamber 2 can be suppressed, the energization rate of the upper heater unit 4 and the circulation fan unit 6 can be reduced, so that the temperature of the cooling air flowing between the main body 1 and the outer shell can be lowered. The temperature of the components in the bottom plate unit 24 and the exhaust temperature exhausted from the louver opening (not shown) of the exhaust cover 33 can be lowered, so that the wooden wall temperature can be lowered.

  Next, operation and action will be described taking steam cooking as an example.

  In FIGS. 1-7, after putting food into the heating chamber 2 and setting the heating mode (here, the steam heating mode) and the time using the operation keys (not shown) of the operation unit below the door 3 When steam cooking is started by pressing a start key (not shown), a water supply pump (not shown) provided in the bottom plate unit 24 is operated to supply water with a water tank 51 to a water supply pipe (not shown). Through a water supply nozzle (not shown), it is sent to a water receiving part (not shown) at the left rear as viewed from the front of the heating chamber 2. When the water in the water receiving portion (not shown) reaches a predetermined amount, the steam heater 14 is energized, and the steam heater 14 is energized with a heating control pattern programmed in the microcomputer (not shown) of the control unit 28. .

  The temperature of the steam heater 14 is detected by a thermistor (not shown) attached to the steam heater 14 at any time, temperature information is sent to the microcomputer (not shown) of the control unit 28, and energization of the steam heater 14 is turned on. Controlled by the OFF control, the water in the water receiving portion (not shown) is heated and becomes steam to fill the heating chamber 2 to heat the food. The heating temperature of the food is controlled by the temperature detected by a thermistor (not shown) provided in the steam heater 14 via the heat insulating plate 17. When the set time is complete, the heating operation is stopped.

  On the other hand, at the same time when cooking is started, a sirocco fan (not shown) of the inverter cooling fan unit 26 provided in the bottom plate unit 24 rotates, and the inlet for the inverter cooling fan unit 26 provided in the bottom plate 34 of the bottom plate unit 24. Cool air outside the main body 1 is introduced from 35a, and is blown to the control unit 28 from the blower port 41 of the inverter cooling fan unit 26 and the blower port 42 and the blower port 43 of the inverter unit 25. Cool the parts.

  At the same time, a sirocco fan (not shown) of the magnetron cooling fan unit 26 provided in the bottom plate unit 24 rotates, and the main body 1 passes through the inlet 36i for the magnetron cooling fan unit 27 provided in the bottom plate 34 of the bottom plate unit 24. Outside cold air is introduced and blown from the blower opening 45 of the magnetron cooling fan unit 27 to cool the magnetron 10. Thereafter, the air guide C46 is sent to the heat insulating plate cover 16 and divided into a flow entering the heating chamber 2 and a flow sent to the outside of the heat insulating plate cover 16. After that, it passes through the heat insulating plate muffler 15 on both sides of the heating chamber 2, the heat insulating plate cover 16, and the heat insulating plate 7 of the circulation fan heater unit 6, and is exhausted diagonally forward from the louver opening (not shown) of the exhaust cover 33. The

  The steam in the heating chamber 2 is exhausted from a punching hole (not shown) provided in the heating chamber 2, and then exhausted through the exhaust guide 44 to the upper left part of the heat insulating plate 8. After merging with the exhaust air described above, the air is exhausted obliquely forward and upward from a louver opening (not shown) of the exhaust cover 33.

Here, the steam heater 14 has a structure in which a sheathed heater (not shown) is molded by aluminum die casting in order to effectively heat a water receiving portion (not shown) of the heating chamber 2. Since the parts are arranged below the heater 14 part, the throttle part 17 having a shape covering the entire steam heater 14 is formed in the steam heater 14 part of the heat insulating plate heater 18. Even if there is an abnormality in the operation of the steam heater 14 and the aluminum of the steam heater 14 is melted, it is possible to receive the melted aluminum at the throttle portion 17, so that the components arranged below the steam heater 14 portion Can be prevented.

  Further, a temperature switch 19 for detecting an abnormal temperature rise of the steam heater 14 is attached in the vicinity of the steam heater 14 portion of the heat insulating plate shita 18. As a result, the abnormal temperature rise of the steam heater 14 can be accurately detected, and the operation can be stopped safely.

  In addition, the heat insulating plate shita 18 covers the bottom surface of the heating chamber 2 and also covers the heat insulating plate bar 15 and the heat insulating plate cover 16 on both sides of the heating chamber 2, and includes an end surface 61 and an end surface 62 in the front-rear direction. A burring is provided on the end face 64, the notch hole 65, and the notch 66 of the notch 63 formed on the right side from the center, and an upwardly convex diaphragm is provided in the vicinity of the substantially L-shaped raised part 20. With the configuration provided by the portion 21, the water that has been transmitted from the heating chamber 2 to the heat insulating plate muffler 15 and the heat insulating plate drip 16 from the heating chamber 2 during steam cooking can be properly received. Since even a part of a certain bottom plate unit does not fall, safety can be improved.

  FIG. 8 is a perspective view of the heating cooker according to the present invention as viewed obliquely after removing the exterior and the oven unit.

  In FIG. 8, a slit 55 is formed around the mounting portion of the temperature switch 19 in the vicinity of the steam heater 14 portion of the heat insulating plate 18. As a result, the influence of heat during the oven operation can be suppressed, and malfunctions can be eliminated.

  Next, the operation and action will be described taking microwave cooking as an example.

  In FIGS. 1-7, after putting food into the heating chamber 2, and setting the heating mode (here microwave oven) and time by the operation key (not shown) of the operation part under the door 3, When microwave oven cooking is started by pressing a start key (not shown), the inverter unit 25 is energized, the magnetron 10 is driven, and high-frequency waves are irradiated from the heating chamber 2 through the waveguide 9 into the heating. Is heated.

  At this time, the antenna motor 12 attached to the waveguide 9 via the antenna motor attachment plate 11 rotates, and the food can be heated uniformly by stirring the high frequency. When the set time is complete, the heating operation is stopped. On the other hand, at the same time when cooking is started, a sirocco fan (not shown) of the inverter cooling fan unit 26 provided in the bottom plate unit 24 rotates, and the inlet for the inverter cooling fan unit 26 provided in the bottom plate 34 of the bottom plate unit 24. 35, cool air outside the main body 1 is introduced and blown from the blower port 41 of the inverter cooling fan unit 26 and the blower port 42 and the blower port 43 of the inverter unit 25 to the control unit 28, and the electric parts of the control unit 28 Cool down.

  At the same time, a sirocco fan (not shown) of the magnetron cooling fan unit 27 provided in the bottom plate unit 24 rotates, and the main body from the air inlet 36i for the magnetron cooling fan unit 27 provided in the bottom plate 34 of the bottom plate unit 24. The cool air outside 1 is introduced and blown from the blower opening 45 of the magnetron cooling fan unit 27 to cool the magnetron 10. After that, the air guide C46 is divided into a flow that is sent to the heat insulation plate left 16 and enters the heating chamber 2 and a flow that is blown out of the heat insulation plate hiding 16.

After that, it passes through the heat insulating plate muffler 15 on both sides of the heating chamber 2, the heat insulating plate cover 16, and the heat insulating plate 7 of the circulation fan heater unit 6, and is exhausted diagonally forward from the louver opening (not shown) of the exhaust cover 33. The Further, the steam in the heating chamber 2 is exhausted from a punching hole (not shown) provided in the heating chamber 2, then exhausted through the exhaust guide 44 and once to the upper left part of the heat insulating plate 8. After merging with the exhaust air described above, the air is exhausted obliquely forward and upward from a louver opening (not shown) of the exhaust cover 33.

  Here, as a method of supplying the high frequency energy of the magnetron 10 to the heating chamber 2, it is general to adopt a configuration in which the waveguide 9 is interposed between the magnetron 10 and the heating chamber 2. The waveguide 9 is formed by sheet metal drawing or bending, and is fastened to the heating chamber 2 by a spot or caulking method. The spot and the caulking position are usually based on the outside of the shaping, but depending on the structure, the hole 9 is provided in the waveguide 9 and the spot or caulking is forced on the inner side 56 in order to improve the fastening. In this case, the hole diameter is set to a dimension that does not allow high-frequency leakage, but lacks stability. In order to reduce high-frequency leakage from the hole 22 of the waveguide 9, the heat insulating plate 18 is provided with a protrusion 23 having a shape that closes the hole 22 of the waveguide 9.

  As a result, the hole 22 of the waveguide 9 and the protrusion 23 are electrically connected to each other, so that the hole 22 of the waveguide 9 is electrically closed, thereby reducing high-frequency leakage.

(Embodiment 2)
FIG. 9 is a perspective view of the heating cooker according to the second embodiment of the present invention, with the exterior portion removed and turned upside down, as viewed obliquely from behind.

  In FIG. 9, when repairing and inspecting the electrical parts and structural parts in the bottom plate unit 24, as shown in FIG. 9, the body 31 of the exterior portion of the heating cooker is removed and the main body 1 is turned upside down. 24 needs to be raised and stood behind the main body 1. At this time, since the bottom plate unit 24 is connected to the main body 1 by a reed sensor harness (not shown), the bottom plate unit 24 cannot be separated from the main body 1, so the bottom plate unit 24 is on the heat insulating plate Cita 18 that covers the heating chamber 2. However, the bottom plate unit 24 is heavy because there are parts, and the fixing is unstable. Therefore, a substantially L-shaped cut-and-raised portion 20 is provided on the heat insulating plate Shita 18. As a result, a part of the bottom plate 34 of the bottom plate unit 24 can be hooked and fixed to the substantially L-shaped cut and raised portion 20, and the bottom plate unit 24 can be securely held. Parts can be repaired and inspected easily.

  As described above, according to the present embodiment, it is possible to secure the protection of parts, the improvement of the oven performance, and the safety in the incorporation of the cooking device.

  The present invention can be applied to heating cookers for electricity, home use, and business use by providing a heat insulating plate that is in the space between the bottom face of the heating chamber and the bottom plate and covers the entire bottom face of the heating chamber.

DESCRIPTION OF SYMBOLS 1 Main body 2 Heating chamber 3 Door 4 Upper heater unit 5 Heat insulation board wafer 6 Circulation fan unit 8 Heat insulation board Ushiro 10 Magnetron 14 Steam heater 15 Heat insulation board drill 16 Heat insulation board wrinkle 18 Heat insulation board Shita 20 Approximate L-shaped raising part 21 Convex Rib portion 23 Protruding portion 24 Bottom plate unit 25 Inverter unit 26 Inverter cooling fan unit 27 Magnetron cooling fan unit 28 Control unit 32 Back plate 33 Exhaust cover 34 Bottom plate 35 Inlet port 35 Inlet port 51 Water tank 55 Slit portion 61 End face

Claims (7)

A heating chamber for storing food; high-frequency heating means for high-frequency heating the food; a heater for heating the food; a steam heater for steam-heating the food; a blower for cooling parts; and A control device that controls the air volume, and a bottom plate that includes the air blower and a control device that controls the air volume of the air blower,
A heating cooker comprising a heat insulating plate in a space between the bottom surface of the heating chamber and the bottom plate and covering the entire bottom surface of the heating chamber. The heating cooker according to claim 1, wherein a throttle portion for receiving the metal melted by the steam heater is provided substantially rearward of the heat insulating plate. The heating cooker according to claim 1 or 2, wherein a temperature switch is provided at a position substantially behind the heat insulating plate to sense a heat source partitioned by a slit. The cooking device according to any one of claims 1 to 3, wherein the heat insulating plate is provided with a substantially L-shaped hook portion formed by cutting and raising. The heating cooker of any one of Claims 1-4 which formed the protrusion part which plugs up the hole of a waveguide in the said heat insulation board in the approximate center. The cooking device according to any one of claims 1 to 5, wherein a side surface of the heat insulating plate is wider than a bottom surface of the heating chamber and receives water from the heating chamber. The heating cooker according to any one of claims 1 to 6, wherein a flange or a narrowed portion is provided in the vicinity of an end face or notch of the heat insulating plate so that water discharged from the heating chamber does not spill out on the bottom plate. .