JP2003317921A - Induction heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem of a conventional induction heating cooker wherein the rotation speed of a cooling fan is stable and the cooling fan is operated at an unnecessary rotation speed for a low heating quantity, causing loud noise. <P>SOLUTION: This induction heating cooker is provided with a heating quantity setting means 24 setting the heating quantity of a heating means 23 for heating the cooking vessel 21 and a rotation speed variable means 26 varying the rotation speed of the cooling fan 25 for cooling the heating means 23. This induction heating cooker can reduce the noise of the cooling fan 25 by setting the rotation speed of the cooling fan 25 according to the heating quantity. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating cooker used at home.

[0002]

2. Description of the Related Art A conventional induction heating cooker will be described with reference to FIG.

Top plate 2 on which cooking container 1 is placed
A heating coil 3 disposed below the top plate 2, a temperature sensor 4 disposed below the top plate 2, and a high-frequency current flowing through the heating coil 3 to induction-heat the cooking container 1. And an inverter circuit 5 for controlling the inverter circuit 5 so that the temperature detected by the temperature sensor 4 reaches a set temperature, and a cooling fan 7 for cooling the heating coil 3 and the inverter circuit 5. ing.

When a power supply or an operation switch (not shown) is pressed to start heating, the inverter circuit 5 is operated by a signal from the control means 6 and a high frequency magnetic field is generated from the heating coil 3. The high-frequency magnetic field heats the cooking container 1 and raises the temperature. The control means 6 is
The control means 6 controls the amount of heating according to the output of the temperature sensor arranged below the top plate 2 for cooking. When the inverter circuit 5 operates, the cooling fan 7 rotates to cool the heating coil 3 and the inverter circuit 5. The rotation speed of the cooling fan 7 is constant regardless of the heating amount, and the heating coil 3 and the inverter circuit 5 are cooled even with the maximum heating amount to prevent an abnormal temperature rise.

[0005]

The induction heating cooker having the above-mentioned conventional structure is provided with a cooling fan for cooling the heating means and operates at a constant rotation speed of the cooling fan regardless of the heating amount. Is. The number of rotations of the cooling fan is set to the number of rotations that allows cooling even when the heating amount is maximum. In recent years, the heating amount of the induction heating cooking container has been increased to about 2.5 kW to 3 kW with the progress of high power, and since the cooling fan is cooled by increasing the rotation speed, the noise of the cooling fan is becoming louder. . The rotation speed of the cooling fan has an irrelevant relationship with the noise level. When the heating amount is low, the rotation speed of the cooling fan does not require a high rotation speed, and the cooling fan operates with a high noise value which is not required for the cooling capacity.

[0006]

According to the present invention, there is provided heating means for heating a cooking container, heating amount setting means for setting the heating amount of the heating means, cooling fan for cooling the heating means, and cooling fan. And a rotation speed varying means for changing the rotation speed of the cooling fan, and the rotation speed of the cooling fan can be set according to the heating amount.

Thus, the number of rotations of the cooling fan can be set according to the amount of heating, and when the amount of heating is small, noise can be reduced, and even if the amount of heating is large, the number of rotations can be increased. The cooling capacity can be improved to reduce the temperature rise of the heating means.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The invention described in claim 1 is a heating means for heating a cooking container, a heating amount setting means for setting a heating amount of the heating means, and a cooling fan for cooling the heating means. The induction heating cooker is provided with a rotation speed varying means for changing the rotation speed of the cooling fan, and sets the rotation speed of the cooling fan according to the heating amount.

According to a second aspect of the invention, the rotation speed varying means includes a power supply voltage detecting means for detecting a power supply voltage, and a voltage correcting means for correcting the rotation speed of the cooling fan based on the output of the power supply voltage detecting means. The induction heating cooker keeps the cooling fan at the set speed even if the power supply voltage fluctuates.

According to a third aspect of the invention, the heating amount setting means includes fried food setting means for setting fried food cooking,
The induction heating cooker according to claim 1 or 2, wherein the number of rotations of the cooling fan is kept constant during fried food cooking.

In the invention described in claim 4, the heating means is
It is equipped with a roaster for grilling fish, etc., and is an induction heating cooker that keeps the rotation speed of the cooling fan constant during roaster cooking.

According to a fifth aspect of the present invention, the heating amount setting means is a heating amount that prevents a high heating amount that requires a rotation speed higher than the rotation speed of the cooling fan set during fried food cooking or roaster cooking. The induction heating cooker is provided with a limiting means so that the number of rotations of the cooling fan is constant during fried food cooking or roaster cooking.

According to the sixth aspect of the present invention, the heating amount setting means is an induction heating cooker that cools the rotation speed of the cooling fan at a lower rotation speed than that at the time of roaster cooking at the end of roaster cooking.

According to a seventh aspect of the present invention, the heating amount setting means is an induction heating cooker which controls the rotation speed of a high heating amount when a plurality of heating means operate.

According to an eighth aspect of the invention, the rotation speed varying means includes a heating temperature detecting means for detecting the temperature of the heating means, and when the output of the heating temperature detecting means exceeds a predetermined temperature, the rotation speed of the cooling fan is changed. It is used as an induction heating cooker.

[0016]

(Embodiment 1) A first embodiment of the present invention will be described below. FIG. 1 is a sectional view showing the structure of this embodiment. The induction heating cooker according to the present embodiment includes a cooking container 21 for heating a food, a top plate 22 made of a non-magnetic material on which the cooking container 21 is placed, and the cooking container 21.
A heating amount setting unit 24 including a heating unit 23 for heating the heating unit and an operation switch for setting the heating amount of the heating unit 23.
A cooling fan 25 for cooling the heating means 23, and a rotation speed changing means 2 for changing the rotation speed of the cooling fan 25.
6 and.

The heating means 23 includes a heating coil 27 for generating an induction magnetic field for heating the cooking vessel 21,
A heating control means 28 for driving and controlling a high frequency current of the heating coil 27, a temperature detection means 29 constituted by a thermistor for detecting the temperature of the cooking container 21 via the top plate 22, and the heating amount setting means. The cooking container 21 is heated by a set heating amount according to the output of 24.

Although the temperature detecting means 29 is provided at the center of the placing portion of the cooking container 21 on the top plate 22, it is only necessary to be able to detect the temperature of the cooking container 21 and it is not limited to the structure of this embodiment. Not a thing. Further, if a plurality of the temperature detecting means 25 are provided so that the temperature of the cooking container 21 can be detected, the temperature detection of the cooking container 21 having a warped bottom surface can be improved. Further, the same effect can be obtained by using the temperature detected by the infrared sensor that detects the bottom surface temperature of the cooking container 21 in a non-contact manner.

The operation of this embodiment will be described below.
When a power source (not shown) is turned on and a predetermined heating amount is set by the operation switch of the heating amount setting means 26, the heating control means 24 supplies a high frequency current to the heating coil 23. When a high frequency current is supplied to the heating coil 23, the heating coil 23
An induction magnetic field is generated from the induction plate, and the cooking container 21 placed on the top plate 22 is induction-heated. This induction heating raises the temperature of the cooking container 21, and the object to be heated in the cooking container 21 is cooked. At this time, the heating control means 26
The temperature information from the temperature detecting means 25 allows the progress of cooking of the object to be heated to be grasped, and the electric power supplied to the heating coil 23 is adjusted according to the progress of cooking. In this way, the food to be cooked in the cooking container 21 is cooked.

When heating is started, a signal from the heating control means 28 causes the rotation speed varying means 26 to rotate the cooling fan 25. The blowing of the cooling fan 25 cools the heating coil 27 and the heating means 23 composed of a semiconductor or the like. The rotation speed varying means 26 controls the cooling fan 25 so that the rotation speed becomes a rotation speed according to the heating amount set by the heating amount setting means 24. The cooling fan 25 has a structure in which a fan is attached to the AC motor and can blow air by rotating the AC motor. The rotation speed changing means 26 controls the phase of the cooling fan 25 to change the input power of the AC motor to set the rotation speed.

Here, the relationship between the number of rotations of the cooling fan 25 and the heating amount will be described. The amount of heating will be described using the electric power for induction heating. When the heating amount is about 3 kW, the rotation speed is set to high speed. Also, the heating amount is about 2
At kW to 1 kW, the rotation speed is set to medium speed. When the heating amount is less than 1 kW, which is small, the rotation speed is set to a low speed.
In this way, the rotation speed of the cooling fan 25 is controlled in three stages in accordance with the heating amount, and the rotation speed is such that the blowing capacity for cooling the heating means 23 and the heating coil 27 is secured. Is.

At this time, in the present embodiment, the heating amount and the number of revolutions are divided into three stages, but it is sufficient if the number of revolutions can be set to an amount suitable for the amount of heating, for example, dividing into finer stages,
When the heating amount is subdivided, the number of rotations suitable for the heating amount may be adapted.

As described above, according to this embodiment, the cooling fan 25 is set according to the heating amount set by the heating amount setting means 24.
Since the number of rotations is controlled, the number of rotations can be controlled according to the heating amount, and an induction heating cooker that can reduce noise when the heating amount is small is realized.

Second Embodiment Next, a second embodiment of the present invention will be described. FIG. 2 is a sectional view showing the configuration of this embodiment. The second embodiment of the present invention is different from the first embodiment in that the rotation speed varying means includes a power supply voltage detecting means 30 for detecting a power supply voltage, and a rotation of a cooling fan based on an output of the power supply voltage detecting means 30. The point is that the voltage correction means 31 for correcting the number is provided.

The power supply voltage detecting means 30 detects the power supply voltage applied to the cooling fan 25 which is a commercial power supply.
The detected voltage signal is sent to the voltage correction means 31.
The voltage correction means sends a voltage correction signal to the rotation speed varying means 26 in response to the signal from the power supply voltage detecting means 30. This correction signal corrects the ignition start time of the phase control, and increases the input power of the cooling fan 25 by shortening the ignition start time when the power supply voltage is low. When the power supply voltage is high, the ignition start time is delayed to reduce the input power of the cooling fan 25. The rotation speed of the cooling fan has a relationship proportional to the voltage applied to the AC motor and the ignition start time. Using this relationship, the cooling fan 25 has the set rotation speed even if the power supply voltage fluctuates. Is obtained.

As described above, according to the present embodiment, the power supply voltage detecting means 30 and the voltage correcting means 31 can detect the fluctuation of the power supply voltage and correct the rotation speed of the cooling fan 25. It realizes an induction heating cooker capable of keeping the cooling fan at a set rotation speed even when the temperature fluctuates.

(Third Embodiment) Next, a third embodiment of the present invention will be described. FIG. 3 is a sectional view showing the structure of this embodiment. In the present embodiment, the heating amount setting means includes a fried food setting means 32 for setting fried food cooking. The number of rotations of the cooling fan 25 is kept constant during cooking of fried food.

The operation of this embodiment will be described below.
During fried food cooking, the temperature signal of the temperature detecting means 29 is used to determine the temperature and amount of oil in the cooking container 21.
This temperature signal is determined by using the absolute value or the change value of the temperature, and controls by capturing the minute temperature change of the temperature detecting means 29. When the number of rotations of the cooling fan 25 changes during cooking of fried food, the cooling air near the temperature detecting means 29 above the heating coil 27 changes, so that it becomes impossible to accurately detect a minute temperature change, and the oil temperature or An error may occur in the oil amount judgment. Therefore, when fried food cooking is set by the fried food setting means 32,
The rotation speed of the cooling fan 25 is kept constant so that the temperature detecting means 29 can accurately detect the temperature.

As described above, in the present embodiment, the fried food setting means 32 can reduce the influence of the temperature detection due to the change in the rotation speed of the cooling fan during the cooking of the fried food, and the oil temperature and the oil amount during the fried food can be reduced. It is possible to realize an induction heating cooker capable of accurately detecting

Fourth Embodiment Next, a fourth embodiment of the present invention will be described. FIG. 4 is a plan view showing the configuration of this embodiment. In this embodiment, the heating means includes a roaster 33 including a heater for grilling fish and the like. The roaster 33 includes a combustion chamber for grilling fish and the like, and a heater in the combustion chamber. The roaster 33 is operated by a setting signal of the heating amount setting means 24, and keeps the rotation speed of the cooling fan 25 constant during the roaster cooking.

The operation of this embodiment will be described below.
After cooking food such as fish is placed in the combustion chamber inside the roaster 33, the heating amount setting means 24 sets roaster cooking. By this operation, the heating control means 28 energizes the heater in the roaster 33 to start heating. The heat of the heater allows the food to be cooked. When the heating is started, the rotation speed varying means 26
The cooling fan 25 is activated to generate cooling air.
This cooling air cools the outer shell of the roaster 33,
A part of the cooling air is put into the roaster 33 to discharge smoke and oil smoke generated during roaster cooking to the outside. During roaster cooking, the temperature inside the roaster is detected from the start of cooking and the temperature is controlled to the set temperature for cooking. When the rotation speed of the cooling fan changes during roaster cooking, the temperature inside the roaster 33 changes,
The set temperature tends not to be uniform. In this embodiment, the temperature deviation due to the fluctuation of the cooling fan is reduced, and the performance of roaster cooking is ensured by rotating the cooling fan at a constant speed.

That is, according to this embodiment, the roaster 33
Is operated by the setting signal of the heating amount setting means 24 and the rotation speed of the cooling fan 25 is made constant during roaster cooking, so that an induction heating cooker capable of cooking at a uniform temperature during roaster cooking can be realized. It is a thing.

(Fifth Embodiment) Next, a fifth embodiment of the present invention will be described. FIG. 5 is a sectional view showing the structure of this embodiment. In this embodiment, the heating amount setting means is the cooling fan 25 set at the time of fried food cooking or roaster cooking.
And a heating amount limiting means 34 for preventing a high heating amount that requires a higher rotation number than the above, so that the cooling fan 25 has a constant rotation number during fried food cooking or roaster cooking. is there.

The operation of this embodiment will be described below. When the operation switch of the heating amount setting means 24 is pressed, the heating control means 28 starts heating and the rotation speed varying means 26 causes the cooling fan 25 to rotate. When the operation switch of the fried food setting means 32 is pressed during the heating and the fried food cooking is started, the rotation speed varying means 26 sets the rotation speed of the cooling fan 25 to the medium speed during the fried food. After that, when the heating amount setting unit 24 tries to change the heating amount to a large heating amount, the heating amount limiting unit 34 limits the heating amount, and the heating control unit 28 cools at a medium speed rotation speed during fried food cooking. The heating amount is limited. Similarly, during roaster cooking, the amount of heating is limited during roaster cooking even if the effective heat quantity that requires a higher rotation speed than medium speed is set.
That is, the amount of heating can be limited so that the rotation speed of the cooling fan is constant during fried food cooking or roaster cooking, cooking can be performed at a uniform temperature, and the cooling performance of the heating means 23 and the heating coil 27 is secured. To do.

As described above, according to this embodiment, the heating amount limiting means 3
By 4, the rotation speed of the cooling fan becomes constant during fried food cooking or roaster cooking by preventing the high heating amount that requires higher rotation speed than the rotation speed of the cooling fan set during fried food cooking or roaster cooking. It is possible to provide an induction heating cooker capable of ensuring the performance of fried food cooking or roaster cooking.

(Sixth Embodiment) Next, a sixth embodiment of the present invention will be described. FIG. 6 is a sectional view showing the configuration of this embodiment. In the present embodiment, the heating amount setting means cools the rotation speed of the cooling fan at a lower rotation speed than that at the time of roaster cooking at the end of roaster cooking. During roaster cooking, it is hot due to the heat of the heater inside the roaster 33. The temperature inside the main body rises due to the temperature of heat radiated from the outer shell of the roaster 33. When the roaster cooking is completed, the temperature inside the roaster 33 is reduced and the cooling fan 25 is rotated to cool the temperature inside the main body. At this time, the rotation speed of the cooling fan 25 is such that a heater or the like that generates heat is not energized, and the cooling fan 25 can be cooled even at a lower rotation speed than during cooking.
That is, at the end of roaster cooking, the noise value of the cooling fan 25 can be reduced by setting the rotation speed of the cooling fan 25 lower than that during roaster cooking.

As described above, according to the present embodiment, the induction heating cooker is designed to cool the rotation speed of the cooling fan at a lower rotation speed than that at the time of roaster cooking at the end of the roaster cooking so as to reduce the noise caused by the cooling fan except at the time of cooking. Is realized.

(Embodiment 7) Next, a seventh embodiment of the present invention will be described. FIG. 7 is a sectional view showing the structure of this embodiment. In the present embodiment, the heating amount setting means is configured to control the rotation speed with a high heating amount when the plurality of heating means 23 operate.

The operation of this embodiment will be described below.
When the plurality of heating means 23 are operated by the operation switch of the heating amount setting means 24, the heating amount setting means 24
The signal of the maximum operating heating amount of any one of the plurality of heating means 23 is sent to the rotation speed varying means 26. The rotation speed varying means 26 receives the signal and rotates the cooling fan 25 at a rotation speed according to the heating amount. That is, the plurality of heating means 2
When 3 is operating, the cooling fan 25 is rotated at the number of rotations corresponding to the maximum heating amount that is operating,
Cooling air for the heating means 23 and the heating coil 27 is secured. The heating amount is often changed by the user during cooking, and each time the operation switch of the heating amount setting means 24 is pressed, the heating control means 28 operates a rotation speed corresponding to the maximum heating amount. It is something to set.

As described above, according to this embodiment, the heating amount setting means 2
Reference numeral 4 indicates that when a plurality of heating means 23 are operated, the number of rotations of the heating amount is high, and the cooling fan 25 is rotated at a number of rotations corresponding to the maximum amount of heating that is operating. Thus, it is possible to provide the induction heating cooker capable of securing the cooling air for the heating means 23 and the heating coil 27 and preventing malfunctions such as thermal runaway.

(Embodiment 8) Next, an eighth embodiment of the present invention will be described. FIG. 8 is a sectional view showing the configuration of this embodiment. In this embodiment, the rotation speed varying means includes a heating temperature detecting means 35 for detecting the temperature of the heating means 23, and when the output of the heating temperature detecting means 35 reaches a predetermined temperature or higher, the rotation speed of the cooling fan 25 is increased. I am trying to do it.

The rotation speed varying means 26 for explaining the operation of the present embodiment is adapted to have three speeds of low speed, medium speed and high speed according to the heating amount. The number of rotations is controlled according to the heating amount set by the heating amount setting means 24. The heating temperature detecting means 35 is the heating means 23.
The temperature of is detected. The heating temperature detecting means 35 sends a signal to the rotation speed varying means 26 to control the rotation speed of the cooling fan 25. When the temperature of the heating means 23 becomes equal to or higher than a predetermined value during heating or at the beginning of heating, the rotation speed control means 26
When operating at low speed, increase the rotation speed to medium speed. In addition, when operating at medium speed, the number of revolutions is increased to high speed. In this way, when the temperature of the heating control means 23 rises above the predetermined value, the cooling fan 2
Since the number of rotations of No. 5 is increased and the cooling air is increased to cool, the temperature rise can be reduced.

In this embodiment, the heating temperature detecting means 24
Is switched to a higher rotation speed when the temperature becomes equal to or higher than the set temperature, but when the temperature becomes equal to or higher than the set temperature at a high speed, heating can be stopped to further enhance safety.
Further, the heating temperature detecting means 35 can obtain the same effect by detecting the temperature of the heating coil 27 and controlling the rotation speed of the cooling fan.

As described above, according to the present embodiment, the heating temperature detecting means 35 for detecting the temperature of the heating means 23 increases the rotation speed of the cooling fan 25 when the output of the heating temperature detecting means 35 reaches a predetermined temperature or higher. Thus, it is possible to realize the induction heating cooker capable of reducing the temperature rise of the heating means 23 and the heating coil 27 by increasing the cooling air.

[0045]

As described above, according to the inventions described in claims 1 to 8, the noise due to the cooling fan can be reduced by setting the rotation speed of the cooling fan according to the heating amount. Further, even if the power supply voltage fluctuates, the cooling fan can be maintained at the set number of revolutions, so that the cooling performance can be secured and the noise due to the cooling fan can be reduced. Further, the rotation speed of the cooling fan is kept constant during fried food cooking, and the influence of temperature detection due to the change in the rotation speed of the cooling fan during fried food cooking can be reduced. Further, during roaster cooking, the rotation speed of the cooling fan is kept constant so that cooking can be performed at a uniform temperature during roaster cooking. In addition, the performance of fried food or roaster cooking can be ensured by making the rotation speed of the cooling fan constant during fried food cooking or roaster cooking. Further, when the roaster cooking is completed, the rotation speed of the cooling fan is cooled at a lower rotation speed than that during the roaster cooking, thereby reducing noise caused by the cooling fan other than during the cooking. Also,
When a plurality of heating means are operated, the number of rotations of a high heating amount is controlled so that the cooling air of the heating means and the heating coil 7 is secured, and malfunction such as thermal runaway can be prevented. Further, when the temperature exceeds a predetermined temperature by the output of the heating temperature detecting means, the number of rotations of the cooling fan is increased so that the cooling air is increased and the temperature rise of the heating means and the heating coil can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an induction heating cooker according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of an induction heating cooker according to the second embodiment.

FIG. 3 is a diagram showing a configuration of an induction heating cooker according to the third embodiment.

FIG. 4 is a diagram showing a configuration of an induction heating cooker according to a fourth embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of an induction heating cooker according to the fifth embodiment.

FIG. 6 is a diagram showing a configuration of an induction heating cooker according to the sixth embodiment.

FIG. 7 is a diagram showing a configuration of an induction heating cooker according to the seventh embodiment.

FIG. 8 is a diagram showing a structure of an induction heating cooker according to an eighth embodiment of the present invention.

FIG. 9 is a diagram showing a configuration of a conventional induction heating cooker.

[Explanation of symbols]

21 cooking container 22 Top plate 23 Heating means 24 Heating amount setting means 25 cooling fan 26 Rotation speed changing means 27 heating coil 28 Heating control means 29 Temperature detecting means 30 Power supply voltage detection means 31 Voltage correction means 32 Fried food setting means 33 roaster 34 Heating amount control means 35 Heating temperature detecting means

Claims (8)

[Claims] 1. A heating unit for heating a cooking container, a heating amount setting unit for setting a heating amount of the heating unit, a cooling fan for cooling the heating unit, and a rotation speed for varying the rotation speed of the cooling fan. An induction heating cooker, comprising: a variable unit, wherein the number-of-rotations-variable unit sets the number of rotations of the cooling fan according to a heating amount. 2. The rotation speed varying means comprises a power supply voltage detecting means for detecting a power supply voltage, and a voltage correcting means for correcting the rotation speed of the cooling fan based on the output of the power supply voltage detecting means. The induction heating cooker according to claim 1, wherein the cooling fan is maintained at a set rotation speed. 3. The induction heating cooker according to claim 1, wherein the heating amount setting means includes a fried food setting means for setting fried food cooking, and the rotation speed of the cooling fan is kept constant during fried food cooking. 4. The heating means is provided with a roaster for grilling fish and the like, and the rotation speed varying means keeps the rotation speed of the cooling fan constant during roaster cooking. Induction heating cooker. 5. The heating amount setting means includes a heating amount limiting means for preventing a high heating amount that requires a rotation speed higher than the rotation speed of the cooling fan set during fried food cooking or roaster cooking, from rotating. The induction heating cooker according to claim 3 or 4, wherein the number varying means is configured such that the number of rotations of the cooling fan is constant during fried food cooking or roaster cooking. 6. The induction heating cooker according to claim 4, wherein the rotation speed varying means cools the rotation speed of the cooling fan at a rotation speed lower than that at the time of roaster cooking when the roaster cooking is completed. 7. The induction heating cooker according to claim 1, wherein the rotation speed varying means controls the rotation speed with a high heating amount when a plurality of heating means operate. 8. The rotating speed varying means comprises heating temperature detecting means for detecting the temperature of the heating means, and increases the rotating speed of the cooling fan when the temperature exceeds a predetermined temperature by the output of the heating temperature detecting means. The induction heating cooker described in any one of 1.