JPH05190267A - Induction heating cooking device - Google Patents

Abstract

PURPOSE:To provide a high efficient induction heating cooking device small in size with low noise. CONSTITUTION:A cooking device has an outer case 27, heating coil 23 provided in the before-mentioned outer case 27 and an inverter 24 for supplying a high frequency current to the before-mentioned heating coil 23. In the inverter 24 and the heating coil 23, a constitutional part is partly mounted to a heat radiating part 32 provided in the outer case 27.

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 in general households.

[0002]

2. Description of the Related Art In recent years, as a convenient, highly efficient and safe cooking device, a high frequency magnetic field is applied to a pan without using fire,
Induction heating cookers that directly heat the pan by using the induction current generated at the bottom of the pan are becoming popular.

FIG. 3 shows an induction heating cooker in the prior art. The induction heating cooker is mainly composed of a ceramic top plate 2 on which the pot 1 is placed, and a disk-shaped heating coil 3 for supplying a high-frequency magnetic field to the pot 1 to give a magnetic field for generating an induction current. There is. The heating coil 3 is provided below the top plate 2. Four
Is an inverter for supplying a high-frequency current to the heating coil 3. The power switching element 5, which is a component of the inverter 4, is attached to a radiator 6 made of aluminum in order to improve heat dissipation. Reference numeral 7 denotes an outer case that houses the heating coil 3 and the inverter 4. Further, 8 is a cooling fan for air-cooling the internal heat-generating components. 9
Is the power cord.

The operation of the above configuration will be described. When the user places the pan 1 on the top plate 2 and connects the power cord 9 to a commercial power source, the cooling fan 8 and the inverter 4 are supplied with power and the induction heating cooker starts operating. The inverter 4 supplies the heating coil 3 with a high frequency current of about 25 kHz. The heating coil 3 generates a high frequency magnetic field and acts on the pan 1. A high-frequency eddy current is generated in the pot 1, and heating is performed by this Joule heat. In this way, the user can cook.

Here, a considerable amount of current and voltage is applied to each component of the heating coil 3 and the inverter 4,
A big loss occurs. Especially power switching element 5
Generates a large amount of heat due to this loss, and it is necessary to cool it by a cooling path in which the cooling fan 8 sucks outside air from the intake port 10 and exhausts it from the exhaust port 11.

[0006]

In the prior art as described above, all the heat generated from the heating coil 3 and the inverter 4 is once discharged into the outer case 7 and then the cooling fan 8 is operated. The cooling method of exhausting from the exhaust port 11 is adopted. Therefore, the amount of heat passing through the outer case 7 is inevitably large. Therefore, in order to ensure the stability of the operation of the device, it is absolutely necessary to improve the air flow in the outer case 7. That is, it is necessary to use the cooling fan 8 having a large capacity, and it is necessary to make a large gap between the parts in order to improve ventilation.

As described above, the conventional induction heating cooker has a problem in that the size of the apparatus becomes large due to the necessity of using a large cooling fan, noise from the cooling fan increases, or power consumed by the cooling fan is increased. However, there is a problem in that the efficiency of the device decreases.

SUMMARY OF THE INVENTION The present invention is intended to solve the problems of the conventional structure, and a first object thereof is to provide a small-sized induction heating cooker with low noise and high efficiency. There is.

A second object of the present invention is to provide a small-sized, low-noise, high-efficiency induction heating cooker capable of protecting the user from the risk of burns and the like.

[0010]

The first means for achieving the first object of the present invention is to provide an outer case, a heating coil provided in the outer case, and a high frequency current to the heating coil. And an inverter that
This is an induction heating cooker in which a part of the components is attached to the heat dissipation portion provided in the outer case.

A second means of the present invention for attaining the second object is, in addition to the constitution of the first means of the present invention,
The heat radiating portion is an induction heating cooker having a heat insulating layer provided on a part of the outer side.

[0012]

According to the first means of the present invention, a part of the components of the inverter is attached to the heat radiating portion provided in a part of the outer casing, and a part of the heat is directly passed through the heat radiating portion to the outside of the outer casing. I'm missing. Therefore, the amount of heat accumulated inside the outer case can be reduced, the cooling fan may be small, and the ventilation path forming the cooling path may be small.

In the second means of the present invention, since the heat insulating layer is provided on a part of the outer side of the heat radiating portion, in addition to the function of the first means of the present invention, there is a risk that the user is burned. That can be protected from.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An induction heating cooker according to an embodiment of the first means of the present invention will be described below with reference to FIG. The induction heating cooker includes a ceramic top plate 22 on which the pan 21 is placed, and a disk-shaped heating coil 23 provided below the top plate 22. Heating coil 2
3 acts to supply a high frequency magnetic field to the pan 21.
Reference numeral 24 is an inverter that supplies a high frequency current to the heating coil 23. A power switching element 25 is a component of the inverter 24. The power switching element 25 is attached to a radiator 26 made of aluminum. Reference numeral 27 is an outer case that integrally has a heat dissipation portion 32 made of aluminum. Heating coil 23 / inverter 2
The parts constituting 4 are housed in the outer case 27. The power switching element 25 attached to the radiator 26 is directly attached to the heat radiating portion 32 via the insulating sheet 33. 28 is a cooling fan, and 29 is a power cord.

The operation of this embodiment will be described below. The heating mechanism of the pan 21 is similar to the conventional technique. The present embodiment is characterized in that the heat generated by the loss of the power switching element 25, which is one of the components of the inverter 24, is released. The heat generated by the power switching element 25 is conducted to the radiator 26, and a part of the heat is generated as in the conventional case.
Heat is radiated from the surface of the inside of the outer case 27. However, in the present embodiment, since the radiator 26 is directly attached to the heat radiating portion 32 that constitutes the outer casing 27 via the insulating sheet 33, most of the heat generated is conducted to the heat radiating portion 32. That is, most of the heat generated by the power switching element 25 is
Heat is directly radiated from the surface of the heat radiating portion 32 to the space outside the outer case 27. Therefore, if the heat generation power from the power switching element 25 is the same as that of the conventional technique, the amount of heat released to the inside of the outer case 27 is small, and therefore the cooling fan 28 having a low capability is used. Is sufficient, and a small one can be used.
As a result, the driving power of the cooling fan 28 can be reduced and the efficiency of the device can be improved. Also cooling fan 2
The noise generated from No. 8 can also be reduced, and the noise of the entire device can be reduced. Furthermore, since the ventilation passages that form the cooling path may be small, it is possible to increase the component density of the components in the device and to downsize the device.

In this embodiment, since a high voltage is applied to the power switching element 25, when the user touches the heat radiating section 32, no electric shock is given.
In particular, the insulating sheet 33 is provided between the radiator 26 and the heat radiating portion 32. Generally, the insulating sheet 33 is inserted between the radiator 32 and the power switching element 25. However, in the present embodiment, the insulating sheet 33 is not inserted between the power switching element 25 and the radiator 33, but instead is used. It is provided between the radiator 26 and the heat radiation portion 32. That is, since the contact area between the power switching element 25 and the radiator 26 is small, when the insulating sheet 33 is inserted therein, the thermal resistance becomes large and the conduction of the amount of heat generated from the power switching element 25 becomes poor. With the configuration of this embodiment, the contact area between the radiator 26 and the heat radiating portion 32 can be increased, and as a result, the heat generated from the power switching element 25 can be released very efficiently. Of course, if a high voltage is not applied to the mounting portion of the power switching element 25, the insulating sheet 33 becomes unnecessary, so that the radiator 26 and the heat radiation portion 32 can be integrated. Further, when applied to a component of the inverter 24 other than the switching element 25 or a component of the heating coil 23, the component can be directly attached as long as the surface of the attachment portion of the component is insulated. ..

When the insulating sheet 33 is inserted as in the present embodiment, the amount of heat transferred to the heat radiating portion 32 can be adjusted by selecting the thickness of the insulating sheet 33, and the heat radiating portion 32 can be adjusted. The temperature can be suppressed appropriately. Further, in the present embodiment, the heat dissipation portion 32 is provided so as to form a part of the bottom surface of the outer case 27, but it is not necessarily limited to the bottom surface and may be provided on the side surface or the like. Most may be die cast made of aluminum.

Next, an embodiment of the second means of the present invention will be described with reference to FIG. In this embodiment, the heat dissipation part 32
A heat insulating layer 33 made of a resin plate having a thickness of 1 mm is provided on a part of the outside of the device, particularly in a part close to the switching element 25.

With this structure, the temperature of the outer surface of the heat insulating layer 33 can be kept low. That is, when the user touches it with the hand, only a very small amount of thermal energy stored near the surface of the heat insulating layer 33 is transferred to the hand of the user, and the temperature of the touched portion is rapidly lowered. From
The conduction heat energy to the user's hand is small.
However, in this configuration, the effect of radiating heat to the outside of the outer case 27 through the heat insulating layer 33 is slightly reduced. However, on the contrary, since the temperature of the heat radiating portion in the portion where the heat insulating layer 33 is provided can be designed to be high, the entire area of the heat radiating portion 32 can be effectively used.

Therefore, by adopting the structure of this embodiment, a small cooling fan 28 can be used as in the previous embodiment, the efficiency of the device can be improved, and the noise of the entire device can be reduced. It is also possible to downsize the device. Further, even if the user touches the hand, the induction heating cooker can be provided with high safety without being burned.

[0021]

As is apparent from the above embodiments, according to the first means of the present invention, the outer case, the heating coil provided in the outer case, and the high-frequency current are supplied to the heating coil. And an inverter that
By using the induction heating cooker in which a part of the components is attached to the heat radiating portion provided in the outer case, it is possible to realize a small-sized device with low noise and high efficiency.

According to the second means of the present invention, in addition to the constitution according to the first means of the present invention, an induction heating cooker is provided in which a heat insulating layer is provided on a part of the outside of the heat radiating portion. In addition to the effect of the first means of the present invention, it is possible to realize a device that can protect the user from the risk of burns and the like.

[Brief description of drawings]

FIG. 1 is a sectional view of an induction heating cooker according to an embodiment of the first means of the present invention.

FIG. 2 is a sectional view of an induction heating cooker according to an embodiment of the second means of the present invention.

FIG. 3 is a cross-sectional view of an induction heating cooker according to a conventional technique.

[Explanation of symbols]

 23 Heating Coil 24 Inverter 27 Outer Case 32 Heat Dissipation Part 33 Thermal Insulation Layer

Claims (2)

[Claims] 1. An outer case, a heating coil provided in the outer case, and an inverter for supplying a high-frequency current to the heating coil, wherein the inverter is a component of a heat radiating portion provided in the outer case. An induction heating cooker with a part attached. 2. The induction heating cooker according to claim 1, wherein the heat radiating portion is provided with a heat insulating layer on a part of the outside.