JP2009176743A - Induction cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an induction cooker, which tends to have higher mounting density in a body and greater ventilation resistance, having a higher-volume, lower-noise and smaller-size air blowing structure in a high-density mounted condition. <P>SOLUTION: The induction cooker includes a top plate 1 arranged on the upper face of the body 2 for a heated vessel to be placed thereon, induction heating coils 3, 4 arranged under the top plate 1, and a turbo fan 5 arranged in the body 2 for cooling electronic substrates 6, 7, 8 which drive the induction heating coils 3, 4. After a 90°-flow is deflected in the turbo fan, the 90°-flow is further deflected in the fan casing 13 to make the directions of a suction port and a plurality of discharge ports correspond to the axial direction of the fan when supplying cooling air. The rotational speed of the fan is changed depending on the material quality of a cooking appliance to be used. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an induction heating cooker.

  The induction heating cooker is a device that performs cooking by using Joule heating due to eddy current generated at the bottom of a pan when magnetic lines generated by passing a high-frequency current through an induction heating coil pass through a metal pan. Since heat is generated not only from the pan but also from the induction heating coil and the electronic substrate that controls the induction heating coil during heating, air cooling is performed using a fan.

  The flow path structure of the conventional induction heating cooker uses an axial fan or a multi-blade fan to ventilate the air sucked from the top plate inlet through the electronic board and further through the induction heating coil. Examples of such a channel structure are disclosed in Documents 1 and 2.

JP 2004-39263 A JP 2002-110329 A

  In recent years, induction heating cookers have a tendency to increase the output of heating coils due to demands for shortening cooking time, and roasters have a tendency to increase the internal volume so that they can handle large-sized cooked products. .

  The types of pans used are not only iron pans that can be heated with high efficiency, but also nonmagnetic stainless steel pans that reduce heating efficiency. In addition to iron and non-magnetic stainless steel pans that can be used with various types of pans, aluminum and copper pans are also available, but the heating efficiency of aluminum pans is higher than that of non-magnetic stainless steel pans. Even lower.

  The electronic board that controls the heating coil is located in the lower space of the roaster in the lower part of the heating coil. However, as the output of the heating coil is increased and the corresponding pots are diversified, the number of control parts for the heating coil increases. The packaging density is high, the ventilation resistance increases, and the heat loss tends to increase. In addition, due to the increase in the internal volume of the roaster, the arrangement space of the electronic substrate is reduced, and the electronic substrate tends to have a higher mounting density.

  As described above, the example of the induction heating cooker disclosed in Patent Document 1 passes cooling air sucked from the intake port by the axial fan through the electronic board and the induction heating coil. Since the induction heating cooker has a high mounting density of equipment inside the main body, the ventilation resistance is large, the operating point is close to the cutoff point as shown in FIG. 11, and the noise is increased when an axial fan is used. There was a problem.

  Moreover, the example of the flow-path structure in the induction heating cooking appliance disclosed by patent document 2 ventilates the cooling air suck | inhaled from the inlet port with the vertical-type multiblade fan to an electronic board | substrate and an induction heating coil. In general, a multiblade fan is widely used for indoor ventilation because of its large air volume and pressure relative to the size of the fan.

However, as shown in FIG. 12, since the impeller is a forward-facing blade in which the rotation direction of the impeller coincides with the exit direction of the blade, there is a characteristic that the absolute speed C _{2 at the} impeller exit becomes very large. Since the absolute speed C ₂ is a pressure loss ΔP = ρ / 2 × C ₂ ^{2 at} the fan outlet, the ventilation resistance is increased, and further, the flow inside the fan casing is adversely affected and becomes a local noise source. There was a problem.

  The present invention solves the above problems, and in particular increases the degree of freedom of arrangement of electronic board components, and also has a high airflow even in a high-density mounting state due to a high output of the heating coil and an increase in the internal volume of the roaster, and An induction heating cooker having a low noise and a small blowing structure is provided.

  In order to solve the above problems, a top plate is provided on the upper surface of the main body, and in the main body, a plurality of heating coils provided below the top plate, a substrate for controlling driving of the plurality of heating coils, In the induction cooking device provided with the heating coil and a fan for cooling the substrate, the fan drives a suction port, a turbo fan, a plurality of discharge ports, a fan casing covering the turbo fan, and the turbo fan. The cooling air, which is composed of a fan motor and led to the suction port, deflects the direction of the flow by 90 degrees in the turbo fan, and then deflects the direction of the flow by 90 degrees in the fan casing, The direction of the suction port and the plurality of discharge ports is made to coincide with the axial direction of the fan, and cooling air is supplied from the plurality of discharge ports, and the rotation of the fan It was varying depending on the material of the cooking utensil to use.

  Further, a top plate is provided on the upper surface of the main body, and in the main body, a plurality of heating coils provided below the top plate, a substrate for controlling driving of the plurality of heating coils, the heating coil, and the In an induction cooking device provided with a fan for cooling the substrate and a motor for driving the fan, the rotation speed of the fan is changed depending on the material of the cooking utensil to be used.

  Furthermore, the maximum number of revolutions is set when the aluminum cooking utensil is heated, and the minimum number of rotations is set when the iron cooking utensil is heated.

A top plate is provided on the upper surface of the main body, and a plurality of heating coils provided below the top plate, a substrate for controlling driving of the plurality of heating coils, the heating coil and the substrate are provided in the main body. In the induction heating cooker provided with a turbo fan to be cooled, a fan casing that covers the turbo fan, and a motor that drives the turbo fan, the present invention according to claim 1, wherein the total height H of the induction heating cooker is When the turbo fan outer diameter D ₂ ratio D ₂ / H is 0.34 to 0.91 and the turbo fan outer diameter D ₂ is in the range of 60 mm to 214 mm, the turbo fan operating speed is 1800. -5900 [min ^-1 ].

  This increases the degree of freedom in arranging the electronic circuit board components, and also has a small air blowing structure with high air volume and low noise even in high-density mounting due to high output of the heating coil and large internal volume of the roaster. A cooking device can be realized.

  According to a third aspect of the present invention, a top plate is provided on the upper surface of the main body, and a plurality of heating coils provided below the top plate are controlled in the main body, and driving of the plurality of heating coils is controlled. An induction heating cooker provided with a heating board, a fan for cooling the heating board, and a motor for driving the fan, the number of rotations of the fan being changed depending on the material of the cooking utensil, The maximum number of rotations when cooking utensils is heated and the minimum number of rotations when heating iron cooking utensils.

  As a result, after recognizing the material of the heating pan, it is possible to change the air volume necessary to efficiently cool the heat generating members such as the electronic board and coil, and the high air volume, high noise level, low noise and small size even in high-density mounting conditions. An induction heating cooker having an air blowing structure can be realized.

Side cut at the center of the induction heating unit on the right. Sectional drawing The appearance inclination figure which showed the induction heating cooking appliance of one Example of this invention. FIG. 3 is an exploded perspective view showing mounting of an electronic board and a fan after removing a top plate and the like from the main body. In the induction heating cooker of the first embodiment of the present invention, the induction heating cooker of eggplant ratio D ₂ / H and flow rate of the outer diameter D ₂ of the total height H the turbofan showed noise level FIG. First in one of the induction heating cooker of Embodiment, relationship diagram of the outer diameter D ₂ of the air volume for the heat-generating member efficiently cooled in the induction heating cooker and the turbofan of the present invention. The vector diagram of the flow which came out of the turbo fan in the induction heating cooking appliance of the 1st Example of this invention. In the induction heating cooker of the second embodiment of the present invention, the fan characteristic diagram of the combination of the engine speed and the outer diameter D ₂ of the turbofan. The induction heating cooker of the 3rd and 4th Example of this invention WHEREIN: The heat loss of the heat generating member in the induction heating cooker in a pot material, and the relationship figure of air volume required in order to cool efficiently. The induction heating cooker of the 3rd and 4th Example of this invention WHEREIN: The relationship figure of the air volume required in order to cool the inside of the induction heating cooker in a pot material efficiently, and a fan rotation speed. The induction heating cooker of the 3rd and 4th Example of this invention WHEREIN: The relationship figure of air volume required in order to cool the inside of the induction heating cooker in a pot material efficiently, and a turbo fan rotation speed. The figure which showed the general characteristic of the axial fan. Schematic comparison of multi-blade fan and turbo fan.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  In this embodiment, an induction heating cooker including two induction heating units, one heater heating unit, and one roaster will be described as an example.

  First, the whole structure of the induction heating cooker of one Example of this invention is demonstrated. FIG. 1 is a side cross-sectional view of the induction heating cooker according to the present invention, cut at substantially the center of the right induction heating unit. Moreover, the arrow in a figure represents the cooling air. FIG. 2 is a perspective view of the appearance of the induction heating cooker according to the present invention, and shows a typical structure common to the induction heating cooker according to the present invention and the conventional induction heating cooker. FIG. 3 is an exploded perspective view showing the mounting of the electronic board and the fan by removing the top plate and the like from the main body in the induction heating cooker of the present invention.

  The top plate 1 is provided on the upper surface of the main body 2 and is made of glass and mounts a load such as a pan.

  Below the top plate 1, there are an induction heating coil 3 corresponding to the right induction heating part and an induction heating coil 4 corresponding to the left induction heating part. Heat the pan.

  A fan 5 using a turbo fan is provided at the back of the main body 2 to cool the electronic boards 6, 7, 8 and the induction heating coil 3. The fan 5 includes a suction port 9, an impeller 10, discharge ports 11 and 12, a fan casing 13, and a fan motor 14. Here, a case where three substrates and two fan discharge ports are used is shown as a representative example.

  The cooling air sucked from the air inlet 15 of the main body 2 is guided to the air inlet 9 of the fan 5 and given momentum by the impeller 10 having a rearward direction or blades driven by the fan motor 14. After deflecting the direction of the flow by 90 degrees, the direction of the flow is further deflected by 90 degrees in the fan casing 13 and supplied from the discharge port 12 to the electronic boards 6, 7, and 8. Supplied. The fan 5 is separated from the electronic boards 6, 7, 8, and the intake port 15 side by a fan casing 13. The directions of the suction port 9 and the discharge ports 11 and 12 are arranged in a direction that coincides with the axial direction of the fan 5. A mouth ring 31 for guiding rectified air to the suction port 9 is provided in the fan casing 13 that separates the suction flow path of the suction port 9 and the suction port 15 of the fan 5.

  The intake port 15 is provided on the rear side of the main body 2 and is an inlet for cooling air inside the main body 2. The electronic boards 6, 7, and 8 are composed of a plurality of boards and are arranged below the induction heating coil 3, and control the right induction heating coil 3, the left induction heating coil 4, and the like. The cooling air that has cooled the inside of the main body 2 passes through the exhaust port 16 and is discharged to the outside.

  An operation unit 17 is provided on the front surface of the main body 2, and a power switch for the entire device, an output adjustment knob for the induction heating coils 3 and 4, and the radial heater 21 are arranged. A liquid crystal panel 18 is disposed in front of the upper surface of the main body 2, and the output of the induction heating unit is displayed in liquid crystal, and the strength of the heating output is transmitted to the user.

  The roaster 19 is provided on the lower left side of the main body 2, is a heater heating type, and is used for cooking grilled fish. The roaster exhaust port 20 is provided at the exhaust port 16 and is an outlet for discharging oil smoke generated from the roaster 19.

  The radiant heater 21 is a heater heating unit provided at the rear of the inside of the main body 2 and is used when cooking in a pan, container, or the like that cannot be heated by the induction heating method.

  The ventilation hole 22 is an opening provided in a plate that supports the induction heating coil 3, and is provided near the lower portion of the induction heating coil 3. The vent 23 is an opening provided for blowing the cooling air blown from the discharge port 11 of the fan 5 directly to the induction heating coil 3. Further, the vent used in the vicinity of the lower side of the induction heating coil 4 on the left side is provided as necessary, and is provided under the induction heating coil 4 or in the vicinity of the periphery in accordance with the arrangement of the roaster 19. In this embodiment, a description will be given of a structure in which only the right induction heating coil 3 is provided with a vent hole.

  The overall operation of the above configuration will be described.

  Place the pan on the right induction heating unit, that is, on the top plate 1 above the right induction heating coil 3, turn on the power switch of the operation unit 17, and like the output adjustment knob corresponding to the right induction heating unit Adjust the output to.

  Then, the electronic boards 6, 7, and 8 cause a high-frequency current to flow through the right induction heating coil 3, generate magnetic lines of force from the induction heating coil 3, and heat the pan. At the same time, the electronic boards 6, 7 and 8 drive the fan 5.

  The driven fan 5 sucks outside air from the air inlet 15, blows cooling air onto the electronic boards 6, 7, and 8 to cool it. The cooling air that has cooled the electronic boards 6, 7, and 8 is directed upward, passes through the vent 22 and the vent 23, and is blown into a space where the induction heating coil 3 and the like are disposed. Then, this is cooled, and then exhausted to the outside air from the exhaust port 16 provided in the rear part of the main body 2.

  Next, the detail of the Example of the fan 5 which concerns on this invention is demonstrated.

  As an embodiment of the present invention, Embodiment 1 will be described with reference to FIGS. 1 and 4 to 6 described above.

FIG. 4 shows the ratio D ₂ / H between the total height H of the induction heating cooker and the outer diameter D ₂ of the turbofan, the air volume, and the noise level in the induction heating cooker according to the present invention. It is a figure. FIG. 5 shows an efficient system curve showing the air volume necessary for cooling the inside of the induction heating cooker and the static pressure necessary for sending the air volume to the induction heating cooker, and the heating member in the induction heating cooker. air volume for cooling and showing the relationship between the outer diameter D ₂ of the turbofan. FIG. 6 shows the vector of the flow leaving the turbofan. In FIG. 6, C ₂ is the fan outlet speed, Cm ₂ is the radial component of the fan outlet speed, Cu ₂ is the rotational direction component of the fan outlet speed, C ₃ is the speed at which the fan exits and collides with the fan casing, Cm _3, the radial component of the C _3, Cu ₃ indicates the rotation direction component of C _3.

First, let the same height direction as the total height H of the induction heating cooker be the fan casing height Hf. FIG. 4 shows the ratio D ₂ / H formed by the total height H of the induction heating cooker and the outer diameter D ₂ of the turbofan on the horizontal axis, and the air volume necessary for cooling the heat generating member in the induction heating cooker. The noise level at that time is shown on the vertical axis. Also, in FIGS. 4 and 5, when the iron pan is heated, the amount of air necessary for cooling the heating member in the induction heating cooker is set to 0.6 m ³ / min, and the aluminum cooking utensil is heated. The air volume necessary for cooling the heat generating member in the induction heating cooker at this time is shown as 2.5 m ³ / min. This is because the total heat loss of the heating member in the induction heating cooker is 600 W when heating the iron pan, and the total heat loss of the heating member in the induction heating cooker is 2200 W when heating the aluminum pan. This is the air volume necessary for this.

The height of the induction heating cooker is limited to about 240 mm for installation in the kitchen. For this reason, there is a tendency that the volume for storing the electronic substrate is small and high-density mounting tends to occur, and in order to increase the cooling air volume, it is necessary to increase the pressure of the turbo fan. However, the outer diameter D ₂ of the turbofan, as well can not be greater than the fan casing height Hf, fan casing height Hf should be smaller than the height of the induction heating cooker. In order to increase the pressure increase generated in the turbo fan, there is a method of reducing the outer diameter D ₂ of the turbo fan and increasing the rotation speed. However, to reduce the outer diameter D ₂ of the turbofan, increasing the rotational speed is a concern such noise increases. Therefore, the outer diameter D ₂ of the turbofan has an optimum outer diameter range due to the height of the induction heating cooker.

First, the case where the ratio D ₂ / H between the total height H (typically 234 mm) of the induction heating cooker of FIGS. 4 and 5 and the outer diameter D ₂ of the turbofan is 0.21 will be described. Here, the outer diameter D ₂ of the turbofan, as shown in FIG. 5 operates at point A is the intersection of 50mm next system curves and the fan characteristics. With this, the pressure of the fan is not sufficient, and the air volume necessary for heating the iron pan cannot be obtained.

Subsequently, when D ₂ / H is 0.34, that is, when the outer diameter D _{2 of the} turbofan is 80 mm, operation is performed at point B, which is the intersection of the system curve and the fan characteristics. For the first time at this point B, the required air volume of 0.6 m ³ / min can be obtained when heating the iron pan. However, when D ₂ / H is in the range of 0.34 to 0.5, operation is performed between points B and C, which are the intersections of the system curve and fan characteristics, so the air volume required for heating the iron pan is 0.6 m ^3. / Min or more can be obtained, but the required air volume of 2.5 m ³ / min when heating the aluminum pan cannot be obtained.

Next, when D ₂ / H is between 0.5 and 0.91, the air flow required for heating the aluminum pan is 2.5 m ³ / You can get more than min. On the other hand, when D ₂ / H is 0.91 or more, operation is performed at point E, which is the intersection of the system curve and the fan characteristics, and it becomes impossible to obtain the air volume of 2.5 m ³ / min required when heating the aluminum pan.

This is because the Toruma between the height of the height or the induction heating cooker of the outer diameter D ₂ and the fan casing of the turbo fan is eliminated. This will be described with reference to the fan outlet vector diagram shown in FIG. This is because the clearance between the outer diameter D ₂ of the turbo fan and the height of the fan casing or the height of the induction heating cooker is reduced, and the fan outlet speed C ₂ blown from the fan collides with the fan casing from the fan. It will not be possible to slow down sufficiently.

Therefore, the pressure loss at the time of collision with the fan casing increases, and the required pressure cannot be increased and the air volume is reduced. Furthermore, fluid sound when colliding because the speed C ₃ larger impinging on the fan casing becomes large, undesirable in connection operation the noise increase in the induction heating cooker.

  As an embodiment of the present invention, Embodiment 1 will be described with reference to FIGS. 6 and 7 described above.

FIG. 7 shows the fan characteristics of the combination of the turbo fan outer diameter D ₂ and the rotational speed so as not to exceed the noise level 55 dB (A) when the turbo fan outer diameter D ₂ and the rotational speed are changed. The noise level 55 dB (A) corresponds to the level of noise that is felt to have a great influence on daily activities.

In FIG. 7, the air volume necessary for cooling the heating member in the induction heating cooker is typically 0.6 m ³ / min when heating the iron pan, and induction heating is used when heating the aluminum cooking utensil. The amount of air necessary for cooling the heating member in the cooker is shown as 2.5 m ³ / min. This is because the total heat loss of the heating member in the induction heating cooker is 600 W when heating the iron pan, and the total heat loss of the heating member in the induction heating cooker is 2200 W when heating the aluminum pan. This is the air volume necessary for this.

  The height of the induction heating cooker is limited to about 240 mm for installation in the kitchen. For this reason, there is a tendency that the volume for storing the electronic substrate is small and high-density mounting tends to occur, and in order to increase the cooling air volume, it is necessary to increase the pressure of the turbo fan.

However, the outer diameter D ₂ of the turbofan, as well can not be greater than the fan casing height Hf, fan casing height Hf should be smaller than the height of the induction heating cooker. Further, when there is no clearance between the outer diameter D ₂ of the turbofan and the height of the fan casing or the height of the induction heating cooker, the fan outlet speed C ₂ blown out from the fan is emitted from the fan and collides with the fan casing. Therefore, the speed cannot be sufficiently reduced, the pressure loss when colliding with the fan casing increases, the required pressure cannot be increased, and the air volume decreases. Furthermore, fluid sound when colliding because the speed C ₃ larger impinging on the fan casing is increased, leading to noise increase in the induction heating cooker.

In order to increase the pressure increase generated by the turbo fan, there is a method of decreasing the outer diameter D ₂ of the turbo fan and increasing the rotational speed. However, when the rotational speed is increased, the noise level exceeds 55 dB (A). Therefore, the turbo fan outer diameter D ₂ and the rotational speed have optimum turbo fan outer diameter and rotational speed ranges from the relationship between the height of the induction heating cooker and the noise. This becomes clear from FIG.

First, in order to obtain the required air volume of 0.6 m ³ / min when heating the iron pan, it is necessary to operate at point F, which is the intersection of the system curve and fan characteristics. Here, since the ratio D ₂ / H between the total height H of the induction heating cooker described in FIG. 4 and the outer diameter D ₂ of the turbofan exceeds 0.91, the air volume decreases, so the outer diameter D of the turbofan. _The upper limit of ₂ is 214 mm.

In this case, it is possible to obtain an air volume of 0.6 m ³ / min or more necessary for heating the iron pan at a rotation speed of 800 min ⁻¹ . On the other hand, to reduce the outer diameter D ₂ of the turbofan in a range that does not exceed the noise level 55 dB (A), when increasing the rotation speed, the outer diameter D ₂ of the turbo fan 60 mm, number of revolutions in 5900Min ^-1 iron pan An air volume required for heating of 0.6 m ³ / min or more can be obtained.

Next, the turbo fan outer diameter and rotational speed for obtaining an air volume of 2.5 m ³ / min or more necessary for heating the aluminum pan will be described. In order to obtain the required air volume of 2.5 m ³ / min when heating the aluminum pan, it is necessary to operate at point G, which is the intersection of the system curve and fan characteristics. When the outer diameter D ₂ of the turbofan is set to the upper limit of 214 mm, the air flow rate of 2.5 m ³ / min or more required for heating the aluminum pan can be obtained at a rotation speed of 1800 min ⁻¹ .

On the other hand, to reduce the outer diameter D ₂ of the turbofan in a range that does not exceed the noise level 55 dB (A), when increasing the rotation speed, the outer diameter D ₂ of the turbo fan 100 mm, iron rpm 4800Min ^-1 The required air volume of 2.5 m ³ / min or more can be obtained when the pan is heated.

Thus, by using the turbo fan, the rotational speed at the time of heating the cookware, the material is iron cookware, the outer diameter D ₂ of the turbofan together efficiently cooled when the aluminum when 100～214Mm 1800 to 4800 min ⁻¹ .

  As an embodiment of the present invention, Embodiment 3 will be described with reference to FIGS.

FIG. 8 includes a top plate on the upper surface of the main body of the present invention, and in the main body, a plurality of heating coils provided below the top plate, a substrate for controlling driving of the plurality of heating coils, In an induction heating cooker provided with a heating coil, a fan for cooling the substrate, and a motor for driving the fan, a heat loss in the induction heating cooker made of a pot material, such as an electronic board, a coil, and the like, and a heating member Shows the air volume necessary to cool the air efficiently. FIG. 9 shows the air volume necessary for efficiently cooling the heat generating member in the pan material and the rotation speed for producing the air volume. In FIG. 8, when the iron pan is heated, the air volume for cooling the heat generating member in the induction heating cooker is set to 0.6 m ³ / min, and induction is performed when an aluminum cooking utensil is heated. The air volume for cooling the heat generating member in the heating cooker is shown as 2.5 m ³ / min. This is because the total heat loss of the heating members in the induction heating cooker is 600 W when heating the iron pan, and the total heat loss of the heating members in the induction heating cooker is 2200 W when heating the aluminum pan, This is the air volume necessary to cool the air.

  As shown in FIG. 8, a cooking utensil made of an aluminum material has a lower heating efficiency than an iron cooking utensil, and therefore heat loss becomes very large. Therefore, the air volume for cooling the electric board and coil which are heat generating members in the induction heating cooker is greatly different. Therefore, the number of rotations can be changed to produce a minimum air volume necessary for cooling the induction heating cooker depending on the material of the cooking utensil. Thereby, in an environment where the induction heating cooker is used, it is possible to realize a low noise space, a power consumption of the fan, and power saving of the induction heating cooker. Moreover, when heating an aluminum cooking utensil, the air volume for cooling the heat generating member in the induction heating cooker is the maximum air volume, and when heating the iron cooking utensil, the heating member in the induction heating cooker is cooled. Because the air volume for the air flow is the minimum air volume, it can be set to the maximum number of revolutions when heating an aluminum cooking utensil, the minimum number of revolutions when heating an iron cooking utensil, and use an induction heating cooker In the environment, low noise space, power consumption of the fan, and power saving of the induction heating cooker can be realized.

FIG. 10 shows a case where a turbo fan is typically used as a cooling fan. Figure 10 is a system curve shown in the case where the turbo fan outer diameter D ₂ and 120 mm, the static pressure required to pump the air volume and the air volume required for cooling the internal induction heating cooker for induction heating cooker The characteristics of the fan that sucks the air volume necessary for cooling the inside of the induction heating cooker are shown. From Fig. 10, the rotation speed required to produce the required air volume of 0.6 m ³ / min when heating iron is 1200 min ^-1 , and the rotation required to produce the required air volume of 2.5 m ³ / min when heating aluminum. The number 4500 min ⁻¹ can be calculated. Further, from the fan noise characteristic of FIG. 10, at 4500 min ⁻¹ , it is possible to satisfy the noise level of 55 dB (A). The noise level 55 dB (A) corresponds to the level of noise that is felt to have a great influence on daily activities. Therefore, they change the material of the cookware to be used, when the outer diameter D ₂ of the turbofan and 120 mm, in a range of rotational speed 1200～4500Min ^-1, and cool the inside of the induction heating cooker, the low noise environment Realization is possible.

  DESCRIPTION OF SYMBOLS 1 ... Top plate, 2 ... Main body 3, 4 ... Induction heating coil, 5 ... Fan, 6, 7, 8, ... Electronic board, 9 ... Suction port, 10 ..Impeller, 11, 12 ... Discharge port, 13 ... Fan casing, 14 ... Fan motor, 15 ... Intake port, 16 ... Exhaust port, 17 ... Operating unit, 18 ... Liquid crystal panel, 19 ... Roaster, 20 ... Roaster exhaust, 21 ... Radiant heater, 22, 23 ... Vent, 24 ... Upper channel wall surface, 25 ... Drainage Plate 26: Lower channel wall surface 27 ... Inclined portion 28 ... Shield member 29 ... Drain port 30 ... Rear channel wall surface 31 ... Mouth ring

Claims (3)

A top plate is provided on the upper surface of the main body, and a plurality of heating coils provided below the top plate, a substrate for controlling driving of the plurality of heating coils, the heating coil and the substrate are provided in the main body. In an induction heating cooker provided with a cooling fan,
The fan includes a suction port, a turbo fan, a plurality of discharge ports, a fan casing that covers the turbo fan, and a fan motor that drives the turbo fan, and the cooling air guided to the suction port is used as the turbo fan. In which the direction of the suction port and the plurality of discharge ports are made to coincide with the axial direction of the fan by deflecting the direction of the flow by 90 degrees in the fan casing. Cooling air is supplied from the plurality of discharge ports,
An induction heating cooker, wherein the number of rotations of the fan is changed according to the material of the cooking utensil that uses the fan. A top plate is provided on the upper surface of the main body, and a plurality of heating coils provided below the top plate, a substrate for controlling driving of the plurality of heating coils, the heating coil and the substrate are provided in the main body. In an induction heating cooker provided with a fan for cooling and a motor for driving the fan,
An induction heating cooker, wherein the number of rotations of the fan is changed according to the material of the cooking utensil that uses the fan. The induction heating cooker according to claim 1 or 2,
An induction heating cooker characterized in that the maximum number of revolutions when heating an aluminum cooking utensil and the minimum number of rotations when heating an iron cooking utensil.

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