JP5018924B2 - Induction heating cooker - Google Patents

Description

  The present invention relates to an induction heating cooker having an induction heating coil of an IH (Induction Heating) system as a heat source.

  2. Description of the Related Art Conventionally, induction heating cookers are known in which an eddy current is induced by a high-frequency magnetic flux generated by flowing a high-frequency current through an induction heating coil, and an object to be heated is heated by Joule heat generated thereby. In this induction heating cooker, when an object to be heated such as a pan is heated, the temperature of a control board such as an induction heating coil or a drive circuit board that controls the induction heating coil rises. And in order to perform these cooling, it is common to mount a cooling fan in the induction heating cooking appliance, and to cool by ventilation.

  In recent years, the object to be heated has been diversified, and there are not only iron pans but also non-magnetic stainless steel pans, copper pans, aluminum pans, and the like. Along with this, the induction heating cooker tends to increase heat generation due to loss in order to realize cooking according to the type of object to be heated, and the effective resistance increases due to the skin effect to increase the frequency, and heat generation occurs. As the size increases, the self-heating of the induction heating coil also increases. In order to improve the performance of such an induction heating cooker, it is required to efficiently cool the induction heating coil and the control board that controls the induction heating coil. Therefore, an induction heating cooker has been proposed in which the induction heating coil and the control board are efficiently cooled.

  For example, a right control device and a cooling fan are disposed on the right side of the housing, and a left control device and a cooling fan are disposed on the left side substantially symmetrically with the right side. An induction heating cooker has been proposed in which cooling air is efficiently flowed in a well-balanced manner in a space between the right side surface and the left side surface of the housing to efficiently cool each component (for example, a patent) Reference 1).

JP 2002-31353 A

  However, when the conventional induction heating cooker performs cooking by driving only one induction heating coil, in the cooking start stage, one region (one induction heating coil and The temperature of the other region (the region where the other induction heating coil and the control substrate that controls the induction heating coil) is increased, while the temperature of the region where the control substrate that controls the induction heating coil is increased. There is almost no rise.

  For this reason, when cooling air containing moisture such as water vapor generated from a pan is taken into the housing, condensation may occur in each part of the other region where the temperature is low. There was a problem that migration occurred, leading to damage to the equipment.

  An object of this invention is to provide the induction heating cooking appliance which solves such a subject and can prevent the damage of the apparatus resulting from tracking and migration effectively.

The induction heating cooker of the present invention has a box-shaped casing on which an object to be heated is placed on the upper surface, a first control provided in the casing, and controls the first heating coil and the first heating coil. A first area in which the substrate is arranged, a second area in which the second heating coil and the second control board for controlling the second heating coil are arranged in the housing, and an external intake. The first cooling fan that blows the cooled air toward the first region, the second cooling fan that blows the cooling air taken from the outside toward the second region, and the first heating coil only the energization start stage, e Bei a cooling fan drive control unit that drives the first cooling fan without driving the second cooling fan, the cooling fan drive control unit, continuous current flow of the first heating coil only The stage includes the second control board when the dew condensation prevention condition is met. To drive the cooling fan.

  The induction heating cooker according to the present invention is controlled by the cooling fan drive control unit so that the first cooling fan is driven without driving the second cooling fan in the energization start stage of only the first heating coil. Therefore, the cooling air taken from the outside is blown toward the first region, and the cooling air taken from the outside is not directly blown to the second region.

  In the energization start stage of only the first heating coil, the temperature of the first region is increased by the heat generation of the first heating coil and the first control board, but the temperature of the second region remains low. is there. At this time, when cooling air containing moisture such as water vapor generated from the pan is taken into the housing, the first heating coil and the first control board disposed in the first region where the temperature has increased. Condensation will not occur. Further, since the cooling air containing moisture is not directly blown to the second region where the temperature is low, dew condensation occurs on the second heating coil and the second control board arranged in the second region. It does not occur.

As described above, since no dew condensation occurs in each component in the housing, it is possible to reliably prevent damage to the device due to tracking and ion migration.
Furthermore, since the inside of the housing is cooled by driving the minimum required cooling fan, noise reduction and energy saving can be realized without unnecessary operation of the cooling fan.

It is a perspective view which shows the whole induction heating cooking appliance which concerns on Embodiment 1. FIG. It is a perspective view which shows the internal structure of the induction heating cooking appliance which concerns on Embodiment 1. FIG. It is a block diagram which shows the structure of a control board. It is a flowchart which shows the cooling operation | movement of the induction heating cooking appliance which concerns on Embodiment 1. FIG. It is a figure which shows the dew condensation conditions of the induction heating cooking appliance which concerns on Embodiment 1. FIG. It is a perspective view which shows the structure of the induction heating cooking appliance which concerns on Embodiment 2. FIG. It is a fragmentary perspective view which shows the structure of the intake shutter provided in an inlet port. It is a perspective view which shows the structure of the induction heating cooking appliance which concerns on Embodiment 3. FIG. It is a fragmentary perspective view which shows the structure of the intake shutter provided in an inlet port. It is a flowchart which shows operation | movement of an intake shutter.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of an induction heating cooker according to the present invention will be described with reference to the accompanying drawings. Note that the present invention is not limited by these embodiments.
Embodiment 1 FIG.
FIG. 1 is a perspective view showing an appearance of induction heating cooker 1 according to the present embodiment. As shown in FIG. 1, the induction heating cooker 1 includes a box-shaped housing 10, a top plate 20 disposed on the top surface of the housing 10, and a grill portion disposed on the center bottom of the housing 10. 30 and a pair of operation portions 40a and 40b provided on the front surface of the housing 10 with the grill portion 30 interposed therebetween.

  The top plate 20 is provided with cooking pan mounting portions 21a and 21b for placing and heating the cooking pan 50, which is an object to be heated, at the front left and right sides, and the cooking pan 50 is mounted on the top plate 20 to provide a radiant. A cooking pot placing portion 21c heated by a heater (RH) is provided at the center rear. In addition, a pair of air intake ports 22a and 22b that intake external cooling air into the housing are provided on the left and right sides at the rear end of the top plate 20, and an air exhaust port 23 that exhausts air inside the housing is provided in the center. Is provided.

  FIG. 2 is a perspective view showing the internal structure of induction heating cooker 1 according to the present embodiment. As shown in the figure, on the right side of the casing 10, an induction heating coil 11a that is disposed immediately below the cooking pot placing portion 21a and induction-heats the cooking pot 50 via the top plate 20, and an induction heating coil 11a. A coil base 12a that supports the induction heating coil 11a from below, a control board 13a that is disposed below the coil base 12a and controls energization of the induction heating coil 11a, and behind the control board 13a. There is provided a cooling fan 14a that is arranged and blows the cooling air taken from the intake port 22a toward the induction heating coil 11a and the control board 13a.

  Similarly, on the left side of the casing 10, an induction heating coil 11b that is disposed directly below the cooking pot placing portion 21b and induction-heats the cooking pot 50 via the top plate 20, and is attached to the lower part of the induction heating coil 11b. A coil base 12b that supports the induction heating coil 11b from below, a control board 13b (not shown) that is disposed below the coil base 12b and controls energization of the induction heating coil 11b, and a rear side of the control board 13b And a cooling fan 14b for blowing the cooling air taken from the intake port 22b toward the induction heating coil 11b and the control board 13b.

Further, a radiant heater 15 is provided at the center rear portion of the housing 10 and is disposed immediately below the cooking pot placing portion 21 c and heats the cooking pot 50 through the top plate 20.
Here, the cooling region 16a is configured by a region located on the right side of the housing 10 with the grill portion 30 interposed therebetween and where the induction heating coil 11a and the control board 13a are arranged. Similarly, a cooling region 16b is configured by a region located on the left side of the housing 10 with the grill portion 30 interposed therebetween and where the induction heating coil 11b and the control board 13b are arranged.

  As shown in the block diagram of FIG. 3, the control board 13a on the right side of the housing has a high frequency power supply 131a for supplying high frequency power to the induction heating coil 11a and an induction heating coil based on a control signal from the operation unit 40a. 11a, a control unit 132a that controls the radiant heater 15 and the cooling fan drive motor 141a, and a calculation unit 133a that performs comparison of temperatures detected by the temperature sensor 17a provided in the cooling region 16a.

Similarly, the control board 13b on the left side of the housing has a high frequency power supply 131b for supplying high frequency power to the induction heating coil 11b and an induction heating coil 11b and a cooling fan drive motor 141b based on a control signal from the operation unit 40b. And a calculation unit 133b that compares the temperatures detected by the temperature sensor 17b provided in the cooling region 16b.
The high-frequency power supply units 131a and 131b are composed of a circuit formed by a heat generating portion such as a switching element and one or more capacitors connected to the circuit.

  As shown in FIG. 2, eddy currents are generated in the cooking pot 50 placed on the cooking pot placing portions 21a and 21b by the magnetic lines generated by energizing the induction heating coils 11a and 11b, and the cooking pot 50 itself generates heat. To do. The radial heater 15 is supplied with AC power of a normal commercial frequency, and the heater itself generates heat, thereby heating the cooking pot 50 with its radiant heat. In the present embodiment, the case where the heating means different from the induction heating coils 11a and 11b is the radiant heater 15 is shown as an example, but the present invention is not limited to this. Further, the heating means for the radiant heater may be an induction heating coil.

  The coil bases 12 a and 12 b are supported from below by a support member (not shown), and are pressed against the top plate 20. The supporting member is not particularly limited as long as it can support the coil bases 12a and 12b. The coil bases 12a and 12b are provided with a ferrite for preventing the magnetic field lines generated from the induction heating coils 11a and 11b from flowing downward, a temperature sensor for detecting the temperature state of the cooking pot 50, and the like. Is preferred.

The top plate 20 is preferably a glass top made of heat-resistant glass or the like, but is not limited to this, and other materials such as a ceramic material may be used.
Further, in the present embodiment, the case where the smoke exhaust port of the smoke exhaust duct of the grill portion 30 occupies a part of the exhaust port 23 is taken as an example, but the present invention is not limited to this. You may provide the exhaust port 23 in the top plate 20 separately. Further, only one exhaust port 23 may be provided at a side position or a front position of the main body instead of the upper surface of the top plate 20 instead of only one.

  The cooling fans 14a and 14b are preferably axial fans, but are not limited thereto. For example, a centrifugal fan typified by a sirocco fan may be used. In this case, it is a necessary condition that the cooling fans 14a and 14b can obtain a sufficiently coolable air volume even if there is a pressure loss in the main body air passage from the intake ports 22a and 22b to the exhaust port 23.

Next, operation | movement of the induction heating cooking appliance 1 which concerns on this Embodiment is demonstrated.
First, the cooling operation of the induction heating coils 11a and 11b and the control boards 13a and 13b will be described with reference to FIG. When the cooling fans 14 a and 14 b are driven, cooling air is sucked from the intake ports 22 a and 22 b at the rear of the top surface of the top plate 20. The sucked cooling air is blown to the control boards 13a and 13b provided on the sides of the grill portion 30 to cool the electronic components on the control boards 13a and 13b.

  Thereafter, the cooling air is sent to the induction heating coils 11a and 11b and the coil bases 12a and 12b located above the control boards 13a and 13b. At this time, a part of the cooling air is supplied to the operation board (not shown) at the front of the casing. )). The cooling air that has cooled the induction heating coils 11 a and 11 b reaches the exhaust port 23 after the radiant heater 15 is cooled, and is discharged to the outside of the housing 10. Next, the cooling operation in the housing 10 when only the induction heating coil 11a on the right side of the housing is used will be described with reference to the flowchart of FIG. First, when the cooking pan 50 is placed on the cooking pan placement portion 21a on the right side of the top plate 20 and the user operates the operation portion 40a on the right side and inputs an instruction to start heating, the input instruction is accepted. (S10).

  When the input instruction is accepted, a control signal is transmitted from the operation unit 40a to the control unit 132a of the control board 13a (S11), and the control unit 132a performs energization control of the induction heating coil 11a and drive control of the cooling fan drive motor 141a. Do together. With these drive controls, energization of the induction heating coil 11a is started (S12), and driving of the cooling fan 14a is started (S13). At this time, since the drive control of the cooling fan drive motor 141b is not performed, the cooling fan 14b is not driven.

By energizing the induction heating coil 11a, heat generation of the induction heating coil 11a and heat generation of electronic components such as switching elements on the control board 13a are started. By driving the cooling fan 14a together with the start of heating, the air whose temperature has increased around the induction heating coil 11a and the control board 13a diffuses in the cooling region 16a on the right side of the casing, and so on in the cooking pan 50 The temperature of the cooling region 16a is raised earlier than the boiling of the food.
For this reason, even when cooling air containing moisture such as water vapor due to boiling in the cooking pot 50 is taken into the housing 10 from the intake port 22a, the temperature of the cooling region 16a has already increased, so induction heating is performed. Condensation does not occur on the coil 11a and the control board 13a.

  In this control, since the induction heating coil 11a and the cooling fan 14a are driven together, the cooling air is taken in from the outside by the cooling fan 14a before the temperature of the cooling region 16a sufficiently rises. However, immediately after the induction heating coil 11a is energized, since the inside of the cooking pot 50 is not boiled, the cooling air does not yet contain much water, and condensation occurs on the control board 13a and the like at this stage. There is nothing.

  In addition, since the induction heating coil 11b on the left side of the casing is not energized, the induction heating coil 11b and the control board 13b do not generate heat, and the temperature of the cooling region 16b where the induction heating coil 11b and the control board 13b are arranged is low. There is. However, since the cooling fan 14b on the cooling area 16b side is not driven, the cooling air containing moisture is blown directly from the intake port 22b toward the cooling area 16b by boiling in the cooking pot 50. There is no. For this reason, condensation does not occur in the induction heating coil 11b and the control board 13b arranged in the cooling region 16b.

  Here, dew condensation refers to a phenomenon in which water vapor contained in the air changes to liquid water on the surface of the object, and when the amount of water vapor that can be contained in the air decreases due to a decrease in temperature, It comes to adhere to the object surface. That is, as shown in FIG. 5, the air can contain more moisture as the temperature becomes higher, and can contain less moisture as the temperature becomes lower. The vicinity of the induction heating cooker 1 is in a situation where a lot of water vapor exists, for example, it evaporates from the cooking pot 50 and scatters to the surrounding space during cooking, and condensation occurs when the temperature of the object surface is low at that time. Will be.

  For example, when the temperature of the components inside the housing 10 is low, such as in winter, when steam is generated from the cooking pan 50 immediately after cooking, air containing a large amount of steam is sucked into the housing 10 and sucked in. The temperature of the air decreases on the surface of the component inside the housing 10, and condensation occurs on the surface of the component.

Assuming a general kitchen environment, the ambient atmosphere temperature of the induction heating cooker 1 is about 5 to 40 ° C. Assuming that the relative humidity of the ambient air of the induction heating cooker 1 rises to about 90% due to the steam generated from the cooking pot 50, the dew point temperature at that time is 3.5 to 38 ° C. If the temperature of the air and components are below this dew point temperature, the possibility of condensation is increased.
Therefore, since the induction heating coil 11b is not driven, the cooling region 16b having a low temperature is not sucked from the intake port 22b, so that external air having a high relative humidity enters the cooling region 16b. It is possible to prevent a situation in which condensation occurs in the cooling region 16b due to ventilation.

  Next, if heating of the cooking pan 50 is continued in a state where only the cooling fan 14a on the right side of the casing is driven, the air in the cooling region 16a whose temperature has risen due to heat generated by the induction heating coil 11a and the control board 13a. A part of is diffused toward the cooling region 16b on the left side of the housing. In addition, heat conduction occurs between the components in the cooling region 16a and the components in the cooling region 16b via the grill portion 30. As a result, the temperature of the cooling region 16b increases at a timing delayed from the temperature increase of the cooling region 16a.

  Therefore, a temperature rise in the cooling region 16b is detected by the temperature sensor 17b (S14), and a comparison between the detected temperature Tr and a predetermined threshold value (a value obtained by adding a constant value α to the dew point temperature Tk) is performed. This is performed at 133b (S15). If the detected temperature Tr is lower than the predetermined threshold value Tk + α as a result of the comparison, the process waits for 10 seconds and returns to the process of S15 (S16). In the process of S15, when the calculation unit 133b determines that the detected temperature Tr is equal to or higher than the predetermined threshold Tk + α, a control signal is transmitted from the control unit 132b to the cooling fan 14b, and the cooling fan 14b starts driving (S17).

  Here, the air blown from the cooling fan 14b on the left side of the casing is not directly directed to the cooling area 16a on the right side of the casing, but a partition plate or the like is provided between the cooling fan 14b and the cooling area 16a in the casing 10. Does not exist. For this reason, when the temperature detected by the temperature sensor 17b provided in the cooling region 16b rises above a certain level from the dew condensation condition (for example, rises to 40 ° C. or more), the cooling fan on the left side of the housing is subjected to the processing of S17. Since 14b starts driving, a part of the cooling air sent out from the cooling fan 14b is also blown to the cooling region 16a on the right side of the casing through the gap between the upper surface of the grill portion 30 and the bottom surface of the top plate 20. Is done.

As a result, the amount of air supplied to the cooling region 16a is increased as compared with the case where the cooling region 16a is cooled by only one cooling fan 14a. For this reason, it is possible to reliably cool the cooling region 16a on the right side of the housing whose temperature has increased due to the heat generated by the induction heating coil 11a and the control board 13a.
Further, the cooling fan 14b on the left side of the housing may drive the cooling air containing moisture from the outside to the cooling region 16b on the left side of the housing. Even in this case, the cooling region 16b has a sufficiently high temperature. Therefore, condensation does not occur on the control board 14b and the like disposed in the cooling region 16b.
Further, as a calculation method in the calculation unit 133b, a method (moving average method) obtained by averaging temperatures from a predetermined time ago may be used.

In S14 and S15, the condition that the detected temperature Tr of the cooling region 16b detected by the temperature sensor 17b exceeds the predetermined threshold value Tk + α is processed as a dew condensation prevention condition. However, instead of S14 and S15, an induction heating coil is used. You may process that predetermined | prescribed time passed since the energization start of 11a as a dew condensation prevention condition. Control by time eliminates the need for temperature sensor measurement and simplifies the control. Furthermore, since a temperature sensor is not required, the number of parts is reduced and the cost is also reduced.
Here, the predetermined time is a time during which the temperature of the cooling region 16b on the left side of the housing can be sufficiently increased even when the heating power of the induction heating coil 11a is minimum or when the external temperature is extremely low such as in a cold district. It is necessary to.

  As described above, according to the present embodiment, the cooling region 16a on the right side of the casing where the control board 13a and the induction heating coil 11a are arranged, and the left side of the casing where the control board 13b and the induction heating coil 11b are arranged. In the cooling region 16b, cooling fans 14a and 14b are provided separately so that the cooling fans 14a and 14b can be individually driven, and the corresponding cooling fan 14a is energized when one of the induction heating coils 11a and 11b is energized. , 14b is driven, so that air containing a large amount of water vapor generated from the cooking pan 50 by cooking is not sucked from the intake ports 22a, 22b on the induction heating coils 11a, 11b side that are not energized.

  As a result, it is possible to effectively prevent the dew condensation that occurs inside the casing when the air inside the casing and the temperature of the components are not sufficiently increased, and to the control boards 13a and 13b and the heating coils 11a and 11b. It is possible to prevent damage to equipment caused by tracking and migration due to the occurrence of moisture condensation. Furthermore, by preventing condensation, it is possible to prevent corrosion and deterioration of the quality of each part and to ensure long-term safety and reliability.

  Further, according to the present embodiment, unnecessary cooling fans 14a and 14b need not be driven at the time of heating, so that driving noise during heating can be reduced and the cooling fans 14a and 14b can be driven. It is possible to provide an induction heating cooker 1 that is excellent in energy saving by reducing electric power.

Embodiment 2. FIG.
Next, the induction heating cooking appliance which concerns on Embodiment 2 is demonstrated. 6 is a perspective view showing the structure of the induction heating cooker 2 according to Embodiment 2, and FIG. 7 shows the structure of the intake shutters 41a and 41b provided at the intake ports 22a and 22b of the induction heating cooker 2. It is a fragmentary perspective view. The second embodiment is different from the first embodiment shown in FIG. 1 in that mechanical shutter mechanisms are provided at the intake ports 22a and 22b. Other configurations are the same as or equivalent to those of the first embodiment. In addition, the same code | symbol is attached | subjected about the component which is the same as that of Embodiment 1, or equivalent, and the description is abbreviate | omitted.

  As shown in FIGS. 6 and 7, the intake ports 22a and 22b are provided with rectangular intake shutters 41a and 41b that can be freely opened and closed, so that the degree of opening can be adjusted according to the situation from fully open to fully closed. It has become. Rotating shafts 42a and 42b are fixed to the base ends of the intake shutters 41a and 41b, and the intake shutters 41a and 41b are openable and closable around the rotating shafts 42a and 42b.

  One end of a rod-shaped connection member 43a is fixed to the operation unit 40a provided on the front surface of the housing 10, and the connection member 43a extends rearward in the housing 10 and the other end of the connection member 43a is inhaled. The shutter 41a is rotatably fixed. The operation unit 40a has a cylindrical shape, and can perform an energization operation of the induction heating coil 11a by operations in the protruding direction and the accommodating direction.

  That is, when the operation unit 40a is pulled out from the housing 10 in the protruding direction, the induction heating coil 11a is energized. When the operation unit 40a is pushed in and accommodated in the housing 10, the induction heating coil 11a is energized. Stop. Moreover, the heating power of the induction heating coil 11a can be adjusted by rotating the operation part 40a to the left and right with the operation part 40a being pulled out in the protruding direction.

  When the operation unit 40a is pulled out from the housing 10 in the protruding direction, the connection member 43a having one end fixed to the operation unit 40a is pulled forward, and the tip of the intake shutter 41a fixed to the other end of the connection member 43a is the rotation axis. Rotating downward around 42a, the intake port 22a is fully opened. As long as the operation unit 40a is not drawn forward, the induction heating coil 11a is not energized, and heating is not started. For this reason, when the operation unit 40a is pulled forward and heating is started, the intake shutter 41a is always opened and the intake port 22a is fully opened. Thus, since the intake port 22a is always fully opened during cooking, the inside of the housing 10 is sufficiently cooled, and a situation in which the inside of the housing 10 becomes hot can be prevented.

When the operation unit 40a is accommodated in the housing 10 at the end of cooking, heating is stopped, and the connection member 43a having one end fixed to the operation unit 40a is pushed backward. When the connecting member 43a is pushed in, the tip of the intake shutter 41a, which is rotatably fixed to the other end of the connecting member 43a, rotates backward about the rotation shaft 42a, and the intake port 22a is completely blocked. Thus, in conjunction with the end of cooking, the intake port 22a is completely blocked by the intake shutter 41a, and the next time the induction heating cooker 2 is used, unless the operation unit 40a is pulled forward. Since heating is not started, it is possible to prevent ambient air from flowing into the housing 10 through the unused intake ports 22a and 22b.
As a result, it is possible to effectively prevent dew condensation when the temperature of the air and components in the unused cooling regions 16a and 16b is not sufficiently increased.

  In addition, since the intake shutters 41a and 41b can be opened and closed in conjunction with the operation units 40a and 40b, it is possible to prevent the intake shutters 41a and 41b from being forgotten to be opened and closed, and at the same time, the user can directly touch the intake portion that is particularly dirty Therefore, the induction heating cooker 2 excellent in hygiene can be provided.

Embodiment 3 FIG.
Next, an induction heating cooker according to Embodiment 3 will be described. FIG. 8 is a perspective view showing the structure of the induction heating cooker 3 according to Embodiment 3, and FIG. 9 shows the structure of the intake shutters 44a and 44b provided at the intake ports 22a and 22b of the induction heating cooker 3. It is a fragmentary perspective view. The third embodiment is different from the second embodiment shown in FIGS. 6 and 7 in that the shutter mechanism provided in the intake ports 22a and 22b is electrically operated. Other configurations are the same as or equivalent to those of the second embodiment. In addition, the same code | symbol is attached | subjected about the component which is the same as that of Embodiment 2, or equivalent, and the description is abbreviate | omitted.

  As shown in FIGS. 8 and 9, the intake ports 22 a and 22 b are provided with rectangular intake shutters 44 a and 44 b that can be freely opened and closed, so that the opening degree can be adjusted according to the situation from fully open to fully closed. It has become. Rotating shafts 45a and 45b are fixed to the base ends of the intake shutters 44a and 44b, and the intake shutters 44a and 44b are openable and closable with the rotating shafts 45a and 45b as the centers of rotation. Drive motors 46a and 46b for rotation are attached to the ends of the rotary shafts 45a and 45b, and the rotary shafts 45a and 45b are rotated by the drive of the drive motors 46a and 46b, and the intake shutters 44a and 44b are accordingly driven. Opens and closes.

  The drive motors 46a and 46b are connected to the control boards 13a and 13b via connection lines 47a and 47b, and are driven and stopped by receiving signals from the control boards 13a and 13b. When the user operates the operation units 40a and 40b to give an instruction to start heating, the control boards 13a and 13b are based on the contents of the instructions, and the induction heating coils 11a and 11b, the radiant heater 15, and the cooling fans 14a and 14b. At the same time, the control signal is transmitted so as to open the intake shutters 44a and 44b. When the control signals are received by the drive motors 46a and 46b, the drive motors 46a and 46b start driving, and the inlet shutters 44a and 44b rotate downward about the rotation shafts 45a and 45b in conjunction with the start of heating. The intake ports 22a and 22b are fully opened.

Next, the operation of the intake shutters 44a and 44b after the heating is stopped will be described with reference to the flowchart of FIG. FIG. 10 shows the operation of the intake shutter 44a when only the induction heating coil 11a is used.
When the user operates the operation unit 40a on the front surface of the housing 10 and inputs an instruction to stop heating, this input is accepted (S20), and an input signal is transmitted from the operation unit 40a to the control board 14a (S21). Based on this input signal, the control board 14a transmits a control signal to the induction heating coil 11a to stop energization of the induction heating coil 11a (S22). At this time, the cooling fan 14a is still driven.

Next, a temperature drop in the cooling region 16a is detected by the temperature sensor 17a (S23), and a comparison between the detected temperature Tr and a predetermined threshold value (for example, a value obtained by adding a constant value α to the room temperature To) is performed on the control board 13b. This is performed by the calculation unit 133a (S24). As a result of the comparison, when the detected temperature Tr is equal to or higher than the predetermined threshold value To + α, the process waits for 10 seconds and returns to the process of S23 (S25). In the process of S24, when the calculation unit 133a determines that the detected temperature Tr is less than the predetermined threshold value To + α, the control unit 132a simultaneously transmits a control signal to the cooling fan 14a and the drive motor 46a. The cooling fan 14a that has received the control signal stops driving (S26). The drive motor 46a that has received the control signal starts driving and rotates the rotary shaft 45a, whereby the intake shutter 44a becomes substantially horizontal and completely closes the intake port 22a (S27).
The stop of the cooling fan 14a and the drive of the intake shutter 44a are not necessarily performed at the same time, and it may be controlled to drive the intake shutter 44a upon detecting that the drive of the cooling fan 14a has stopped.

As described above, according to the present embodiment, the drive motors 46a and 46b are driven in conjunction with the heating start signal from the operation units 40a and 40b, and the intake shutters 44a and 44b open the intake port 22. For this reason, when heating is started, the intake shutters 44a and 44b are always opened, and the intake port 22a is fully opened. As described above, since the intake port 22a is always fully opened during cooking, the inside of the housing 10 is sufficiently cooled, and a situation in which the inside of the housing 10 becomes hot can be prevented.
At the end of cooking, the drive motors 46a and 46b are driven in conjunction with the heating end signal from the operation units 40a and 40b, and the intake shutters 44a and 44b completely block the intake port 22. As described above, the intake port 22a is completely closed by the intake shutters 44a and 44b at the end of cooking, and when the induction heating cooker 3 is used next time, the operation units 40a and 40b are moved forward. Since the heating is not started unless it is drawn out, ambient air can be prevented from flowing into the housing 10 through the unused intake ports 22a, 22b.
As a result, it is possible to prevent condensation in the case where the air and the temperature of the components in the unused cooling regions 16a and 16b are not sufficiently increased.

  In addition, since the intake shutters 44a and 44b can be opened and closed in conjunction with the operation units 40a and 40b, forgetting to open and close the intake shutters 44a and 44b can be prevented, and at the same time, the user directly touches an intake portion that is particularly dirty. Therefore, the induction heating cooker 3 excellent in hygiene can be provided.

  As described above, the induction heating cooker according to the present invention is useful as an application of an induction heating cooker that can prevent damage to equipment due to tracking or migration occurrence on a control board or heating means, and corrosion of each part. is there.

  1, 2, 3 ... induction heating cooker, 10 ... casing, 11a, 11b ... induction heating coil (first and second heating coils), 12a, 12b ... coil base, 13a, 13b ... control board (first And second control board), 14a, 14b ... cooling fans (first and second cooling fans), 15 ... radiant heaters, 16a, 16b ... cooling regions (first and second regions), 17a, 17b ... Temperature sensor 20 ... Top plate, 21a, 21b, 21c ... Cooking pan mounting part, 22a, 22b ... Intake port (first and second intake ports), 23 ... Exhaust port, 30 ... Grill part, 40a, 40b ... operation part (first and second operation part), 41a, 41b, 44a, 44b ... intake shutter (first and second intake shutter), 42a, 42b, 45a, 45b ... rotating shaft, 43a ... Connection member (first and second connection members), 46a, 46b ... drive motor, 47a, 47b ... connection line, 50 ... cooking pot (object to be heated), 131a, 131b ... high frequency power supply, 132a, 132b ... control (Cooling fan drive control unit, intake shutter drive control unit), 133a, 133b,.

Claims (6)

A box-shaped housing for placing an object to be heated on the upper surface;
A first region provided in the housing and disposed with a first heating coil and a first control board for controlling the first heating coil;
A second region in which the second heating coil and a second control board for controlling the second heating coil are disposed;
A first cooling fan that blows cooling air taken from the outside toward the first region;
A second cooling fan that blows cooling air taken from the outside toward the second region;
The energization start stage of only the first heating coil includes a cooling fan drive control unit that drives the first cooling fan without driving the second cooling fan,
The cooling fan drive control unit drives the second cooling fan when the energization continuation stage of only the first heating coil satisfies the dew condensation prevention condition of the second control board. Induction heating cooker. Wherein the case of satisfying the anti-condensation conditions, the induction heating cooker of claim 1, wherein said second region temperature or the outside of the casing temperature is characterized in that it is a case of exceeding a predetermined threshold. Wherein the case of satisfying the anti-condensation conditions, the induction heating cooker of claim 1, wherein the predetermined time from the energization start of the first heating coil is when elapsed. A first air inlet provided in the housing for introducing external cooling air into the first cooling fan;
A first air intake shutter attached to the first air intake port and capable of adjusting an opening degree;
A second air inlet provided in the housing for introducing external cooling air into the second cooling fan;
The induction heating cooker according to any one of claims 1 to 3 , further comprising a second intake shutter attached to the second intake port and capable of adjusting an opening degree. A first operation unit that is provided at the front of the housing and operates in the protruding direction and the accommodating direction to perform the energization operation of the first heating coil;
A first connection in which one end is attached to the first operation portion and the other end is attached to the first intake shutter, and the first intake shutter is driven in conjunction with the operation of the first operation portion. Members,
A second operation unit that is provided in the front portion of the housing and operates in a protruding direction and an accommodation direction to perform an energization operation of the second heating coil;
A second connection in which one end is attached to the second operation unit and the other end is attached to the second intake shutter, and the second intake shutter is driven in conjunction with the operation of the second operation unit. The induction heating cooker according to claim 4 , further comprising a member. A first operation unit that is provided at the front of the housing and performs an energization operation of the first heating coil;
A second operation unit that is provided at the front of the housing and performs an energization operation of the second heating coil;
Drive control of the first intake shutter is performed based on a control signal from the first operation unit, and drive control of the second intake shutter is performed based on an energization operation signal from the second operation unit. The induction heating cooker according to claim 4 , further comprising an intake shutter drive controller for performing the operation.

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