JP2003077637A - Induction heat-cooking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an induction heat-cooking device which can effectively cool a control substrate generation heat and heating coils, improved the cooling characteristic, and facilitate the cooling design. SOLUTION: An exclusive air passage for directly feeding air to the heating coils 13 and 14 and the control substrate 21 from an outlet of a fan 22 is provided to effectively cool.

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, and more particularly to a cooling structure.

[0002]

2. Description of the Related Art Conventionally, as an electromagnetic induction heating cooker of this type, for example, Japanese Patent Laid-Open No. 6-338384 shown in FIG. 10, Japanese Patent Laid-Open No. 11-87040 shown in FIG. There were some such as those described in Japanese Patent Publication No. 11-185947.

In FIGS. 10, 11 and 12, 1 is an air passage for blowing air by a fan, 2 is a heating coil for generating lines of magnetic force, 3 is a top plate disposed above the heating coil, and 4 is a heating coil 2. Is a control board for controlling the energization to the.

FIG. 10 shows a structure in which a partition is attached between the heating coil 2 and the control board 4, and the control board 4 and the heating coil 2 constitute an air passage 1 which is blown by a fan in this order.

Further, FIG. 11 shows that a duct forming the air flow path 1 blown by a fan is provided, and a plurality of heat dissipation plates are provided on the control board 4 inside the duct.

Further, FIG. 12 shows that an air air passage 1 blown by a fan is provided between the heating coil 2 and a top plate above the heating coil 2, and the entire supporting structure of the heating coil 2 is inclined to form an air air passage. The number 1 is narrowed from the leeward side to the leeward side.

[0007]

However, in the above-mentioned conventional configuration, the heating coil is cooled by the air passing through the control board. Therefore, the temperature rises by the time the air reaches the heating coil, and the warm air is generated. Since the heating coil is cooled, the cooling effect is deteriorated, more air volume is required for cooling the heating coil, and air is blown to the part that is not so much involved in cooling the control board part to cool the heating coil. There was a problem that it was necessary to balance the cool air and design the air flow. In addition, an air flow path blown by the fan is provided between the heating coil and the top plate above the heating coil, and the heating coil supporting structure is inclined with respect to the heating coil.
The air duct is designed to narrow from the windward side to the leeward side, but depending on the degree of narrowing of the air duct, the air flow shifts to the outer peripheral portion of the heating coil, so cooling can be performed effectively. It was necessary to balance the air ducts. In addition, the gap between the heating coil and the cooking utensil arranged above the heating coil is a necessary design parameter for obtaining the desired power consumption during heating in the design of the induction heating cooker, and the gap is large. If too much, the number of lines of magnetic force generated from the heating coil passing through the cooker to be heated is reduced, and the eddy current generated is reduced, resulting in a problem that the amount of heating is reduced.

The present invention solves the above-mentioned conventional problems and provides an induction heating cooker that facilitates cooling design of a control board and a heating coil that generate a large amount of heat, effectively performs cooling, and improves cooling performance. The purpose is to provide.

[0009]

In order to solve the above-mentioned conventional problems, an induction heating cooker of the present invention comprises a main body, and a top plate provided on the upper surface of the main body on which cooked cooking utensils are placed. On the lower surface side of the top plate, a plurality of heating coils housed in a substantially flat-plate-shaped coil base having an opening in the center, a support plate for supporting the heating coils, and controlling energization to the heating coils A control board, an intake port on one side of the main body, an exhaust port on the other side, and a fan disposed below the intake port, the plurality of heating coils from the blow-out port of the fan, the control It is equipped with a dedicated air passage for blowing air to the substrate.

As a result, the cool air from the intake portion is blown directly to the heating coil and the control board, and effective cooling can be performed. Further, since the air flow path is divided for each heat generating component, the distribution of the cooling air can be facilitated and the design can be facilitated.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 is such that a main body, a top plate provided on the upper surface of the main body on which cooked food is placed, an opening at the center of the lower surface side of the top plate. A plurality of heating coils housed in a substantially flat coil base having parts, a support plate for supporting the heating coils, a control board for controlling energization of the heating coils, and one of the upper parts of the main body. Intake, exhaust on the other,
A fan disposed below the intake port, and a dedicated air passage for blowing air from the blowout port of the fan to the plurality of heating coils and the control board.

Further, by making a structure in which the air is blown directly and independently to the heating coil and the control board, the respective parts can be cooled by the cold air in the intake section,
The cooling performance can be improved. Further, since the air passages are different for each part, the design can be easily performed.

According to a second aspect of the present invention, in the structure according to the first aspect, the support plate below the heating coil is heated from the windward side to the leeward side of the wind blown from the fan to the heating coil. It is provided with an inclined surface that inclines upward to the coil side. Then, the air blown to the heating coil can be effectively passed through the heating coil upper surface and lower surface, and further from the lower surface to the upper surface to improve the cooling performance of the heating coil.

According to a third aspect of the present invention, in the structure according to the second aspect, a partition plate is provided outside the heating coil in a direction substantially the same as an air flow path to the heating coil and substantially perpendicular to the support plate. It is a thing. Then, it is possible to prevent the air blown to the heating coil from being dispersed to the outside of the heating coil, effectively apply the air to the heating coil, and improve the cooling performance.

According to a fourth aspect of the present invention, in the structure of the first or second aspect, a roaster is provided below the heating coil, a support plate located above the roaster is provided, and the support plate is formed by a fan. It is provided with an inclined surface which inclines upward to the heating coil side from the upwind side of the blown air to the downwind side. Then, by tilting the support plate, a large air heat insulating layer is formed between the roaster and the support plate, and it is possible to reduce the heat influence on the heating coil when the roaster is used.

The invention according to claim 5 is based on claims 1 to 4.
In the structure described in any one of the above 1, an independent top plate duct for blowing air from a fan is provided above the bottom surface of the top plate and above the front side of the main body. During heating and cooking, the front portion of the top plate, which is easily touched, is cooled, and even if the front plate front portion is touched by the hand, it can be used more safely.

The invention described in claim 6 is from claim 1 to claim 4.
In the structure described in any one of 1 to 3, a ventilation duct is provided between the lower surface of the top plate and the front upper side of the main body, and the ventilation duct is provided with an opening on the top plate side. And, by forming an air passage from the opening of the ventilation duct to the top plate, the front part of the top plate, which is easy to touch when heating and cooking, is more effectively cooled, and even if the front part of the top plate is touched, it is safer. Can be used for

According to a seventh aspect of the present invention, in the structure according to the sixth aspect, a heating display portion is provided in the ventilation duct. Then, the heating display section can be effectively blown with air, and the reliability of the heating display section can be improved.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a perspective view showing the internal construction of an induction heating cooker according to Embodiment 1 of the present invention.
FIG. 3 is an external perspective view.

In FIGS. 1 and 2, 11 is a top plate provided on the upper surface of the main body 12 on which a pot or the like to be cooked is placed, and 13 and 14 are right heating coils provided below the top plate 12. The left heating coil. 15,
16 is a right heating coil base and a left heating coil base for housing the heating coils 13 and 14, 17 is a top frame provided on the outer periphery of the top plate, 18 is an intake port provided in the top frame 17 behind the right heating coil 13, and 19 is It is an exhaust port provided behind the left heating coil 14. 20 is a right heating coil 13 and a left heating coil 14 coil base 15,1
A support plate that supports the entire 6 and a control substrate 21 that controls the energization of the right heating coil 13 and the left heating coil 14 provided at the lower portion of the support plate 20. 22 is a fan provided in a fan case 23 located right behind the control board 21 below the intake port, and 24 is a lower part of the support plate 20 and the control board 21.
Of the fan 22 formed by the substrate cover 24 and the support plate 20. The substrate cover 26 and the support plate 20 surround the main body 12 and the control substrate 21 located above, and form a control substrate duct 25 connected from the outlet of the fan 22. A right heating coil duct leading from the outlet to the right heating coil 13 and a left heating coil duct leading to the left heating coil 14, and 28 are operating parts.

The operation and action of the induction heating cooker configured as described above will be described below.

First, the pot placed on the top plate 11 is heated by generating an eddy current by the magnetic lines of force generated by the heating coils 13 and 14. There is a relationship of P∝ (TI) 2 (P: power consumption, T: number of heating coil turns, I: current flowing through the heating coil) between this heating and the heating coils 13 and 14. Normally, the self-heating of the heating coil varies depending on the flowing current, the number of the constituent wires, the cross-sectional area of the wires, and the like.
When a heating coil of 0.3, 50 wires, and 26 turns is used and the horo pan is heated at 2 KW, a current of about 25 A flows through the heating coil and self-heating of about 40 W occurs. , The temperature of the heating coil rises because the heat is easily received from the pot heated in the upper part, so that the upper limit of the temperature of the insulator of the heating coil (H type 170 in this embodiment).
It is necessary to cool the heating coil with cooling air so that the temperature does not exceed ℃).

Further, turning on / off the current to the heating coil
As with the heating coil, a large current flows through the control board that controls the heating coil. When heating is performed with one heating coil, a switching element that turns on / off, a diode bridge that converts alternating current to direct current, etc. In addition, although it depends on the control circuit of the inverter and the thermal resistance of the element, about 100 watts of self-heating is generated. Therefore, these switching elements and diode bridges are attached to an aluminum extruded heat sink to apply cooling air to radiate heat, thereby satisfying the operating temperature specifications of each component. In addition, the control circuit has many other heat-generating components such as a resonance capacitor that resonates the heating coil.

Therefore, conventionally, the cooling fan has been used to blow air to the control board and the heating coil for air cooling. However, in the conventional cooling method, the air blown from the cooling fan passes through the control board that generates a large amount of heat first, and the heating coil is cooled by the air that has passed, so the temperature of the air reaches the heating coil. Since the heating coil is cooled by the rising and warm air, the cooling effect of the heating coil is poor, and more air volume is required for cooling the heating coil, and it is not necessary to cool the control circuit part. Cooling design is very difficult due to the need to blow air and balance the cooling air to cool the heating coil, and when the layout of the control circuit components changes, the cooling of the heating coil is also redesigned. It was supposed to be redone.

However, in this embodiment, the control board duct 25, the right heating coil duct 26, and the left heating coil duct reach the control board 21, the right heating coil 13, and the left heating coil 14 from the outlet of the fan 22. 27 are provided independently, and cold air is blown to each independently.
Heating coils 13 and 14 that are heat-generating components from the fan outlet
Also, since there are no other heat-generating components in the air path leading up to the control board 21, they are not affected by heat, effectively cooling each component, and even if the component layout is changed, There is no need to review the cooling.

In order to obtain the effect of this embodiment,
It suffices if there are no other heat-generating components in the air passage from the fan outlet to reach the heat-generating component. For example, if there are multiple heat-generating components in the duct that forms one air passage from the fan outlet. However, if the plurality of heat-generating components are arranged substantially parallel to each other in the direction of the air flow from the fan, and the cooling air from the fan does not pass through the other heat-generating components, but reaches the plurality of heat-generating components directly. , Heat-generating components in the same air duct (in the same duct) are affected by heat from other heat-generating components,
Although the cooling performance will drop a little compared to when cooling air is blown directly from the fan to each heat-generating component, by the time the cooling air from the fan reaches the heat-generating component,
By not passing through other heat-generating components, the same effect as this embodiment can be obtained.

(Embodiment 2) FIG. 3 is a sectional view for explaining a main part of an induction heating cooker according to a second embodiment of the present invention.

In FIG. 3, the difference from the configuration of the first embodiment is that a support plate disposed below the heating coils 13 and 14 is placed outside the heating coils 13 and 14 from the windward side of the air blown. The point is that an inclined surface 29 is provided which is inclined upward toward the heating coils 13 and 14 toward the leeward side.

The operation and action will be described below. First, the pan placed on the top plate is the heating coil 13,
The magnetic lines of force generated from 14 generate an eddy current and heat it. For this reason, it is easy to receive heat from the pot or the like heated at the top. The heating coils 13 and 14 are the heating coil base 1
5 and 16, the heating coil bases 15 and 16 contain ferrite so as to suppress the downward leakage of the magnetic field and effectively heat the pot or the like. Therefore, the lower surfaces of the heating coils 13 and 14 have heating coil bases 15 and 16
As a result, the area that radiates heat is reduced. Therefore,
When the air is effectively blown on the upper surfaces of the heating coils 13 and 14 having a large heat radiation area for cooling, the heat effect from the pot or the like at the upper portion can be reduced, so that the cooling effect is further enhanced.

However, the distance between the upper surface of the heating coils 13 and 14 and the pan is an important parameter in the design of the induction heating equipment, and the shorter the distance, the more the heating coils 13 and 14 are.
The generated magnetic field lines pass through the pan well and the heating efficiency improves. Therefore, the gap between the heating coils 13 and 14 and the top plate 11 on which the pan is placed is narrower than the distance to the support plate 20 below the heating coils 13 and 14 (in this embodiment, the distance between the upper surface of the heating coils and the top plate is about 4 mm). ), A large amount of wind passes below the coil bases 15 and 16, and it was difficult to blow the air to the upper surfaces of the heating coils 13 and 14. Therefore, in the present embodiment, the support plate 20 disposed below the heating coils 13 and 14 is provided outside the heating coils 13 and 14 from the windward side of the blown wind to the leeward side.
By forming the inclined surface 29 that inclines upward to the side, the wind flows along the inclination, flows into the upper surfaces of the heating coils 13 and 14, and the wind can be effectively applied.

In order to obtain the effect of this embodiment,
It suffices if the uppermost portion of the inclined surface 29 is outside the heating coils 13 and 14, and the same effect can be obtained even if the shape of the inclination is, for example, a mountain shape inclined at an acute angle or an obtuse angle. The same effect can be obtained even when the inclined shape is formed by another member.

Further, as shown in the cross-sectional view of the main part of FIG. 4, the inclined surface of this embodiment is provided below the heating coils, so that the rear surface of the heating coils 13 and 14 can be opened from the air passages and the central opening. By forming an air flow path leading to the upper surface of the heating coil, the air can be effectively applied to the heating coil, and the cooling performance can be improved.

Further, as shown in the perspective view of the main part of FIG. 5, in this embodiment, a partition plate 31 is provided outside the heating coils 13 and 14 in substantially the same direction as the air flow path and at a substantially right angle to the support plate 20. By providing, the blown air can be prevented from being dispersed to the outside of the heating coils 13 and 14, and the air can be effectively applied to the heating coils.

Further, as shown in the sectional view of the main part of FIG. 6, in this embodiment, when the roaster 32 is provided, the shape of the support plate 20 located below the heating coils 13 and 14 and above the roaster 32 is changed. By forming a shape that inclines upward toward the heating coils 13 and 14 from the windward side of the blown air to the leeward side, a large air heat insulating layer can be formed between the roaster 32 and the support plate 20. The heat effect can be reduced and the cooling performance can be improved.

In order to obtain the effect of this embodiment,
It suffices that the inclined shape is located below the heating coil and above the roaster, and the same effect can be obtained even if the inclined shape is, for example, a mountain shape inclined at an acute angle or an obtuse angle.

(Third Embodiment) FIG. 7 is a perspective view showing the inside of an induction heating cooker according to a third embodiment of the present invention. In the figure, the difference from the configuration of the first embodiment is that a top plate duct 33 that forms an air flow path is provided between the front of the main body and the bottom of the top plate.

Next, the operation will be described. First, by providing a top plate duct 33 that forms an air flow path that blows air independently from the fan outlet to the front side of the main body 12 below the top plate 11 provided on the upper surface of the main body 12, The front part of the top plate 11 that can be easily touched by a person can be cooled, and even if the front part of the top plate 11 is touched by the hand, it is not hot and can be used safely.

Further, as shown in the internal perspective view of FIG. 8, in this embodiment, a ventilation duct 34 is provided in the width direction of the main body 12 between the lower side of the top plate 11 and the front side of the main body 12,
The ventilation duct 34 has an opening 35 on the top plate 11 side.
By providing the airflow, air is blown from the opening 35 of the ventilation duct 34 toward the back surface of the top plate 11, and the front portion of the top plate 11, which is easy to reach during heating and cooking, is cooled more effectively. Even if the part is touched by the hand, it is not hot and can be used more safely.

Further, as shown in the internal perspective view of FIG. 9, by providing the heating display section 36 in the ventilation duct 34, it is possible to blow air on the heating display section, and the parts of the heating display section are provided. The reliability of can be improved.

[0041]

As described above, according to the description of the present invention,
The cooling performance of each part of the heat generating part such as the control board and the heating coil can be improved, and the cooling design becomes easy.

[Brief description of drawings]

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

FIG. 2 is an external perspective view of an induction heating cooker.

FIG. 3 is a sectional view of a main part of an induction heating cooker according to a second embodiment of the present invention.

FIG. 4 is a sectional view of a main part of another induction heating cooker according to the second embodiment of the present invention.

FIG. 5 is a perspective view of a main part of another induction heating cooker according to the second embodiment of the present invention.

FIG. 6 is a sectional view of a main part of another induction heating cooker according to the second embodiment of the present invention.

FIG. 7 is a perspective view of the inside of an induction heating cooker according to a third embodiment of the present invention.

FIG. 8 is a perspective view of the inside of another induction heating cooker according to the third embodiment of the present invention.

FIG. 9 is a perspective view of the inside of another induction heating cooker according to the third embodiment of the present invention.

FIG. 10 is a cross-sectional view of a conventional induction heating cooker.

FIG. 11 is a cross-sectional view of another conventional induction heating cooker.

FIG. 12 is a cross-sectional view of a main part of another conventional induction heating cooker.

[Explanation of symbols]

11 top plate 12 body 13 Right heating coil 14 Left heating coil 15 Right heating coil base 16 Left heating coil base 18 air intake 19 exhaust port 20 Support plate 21 Control circuit 22 fans 23 fan case 24 board cover 25 Control circuit duct 26 Duct for right heating coil 27 Duct for left heating coil 29 slope 31 Partition Board 32 roaster 33 Top plate duct 34 Ventilation duct 35 opening 36 Heating display

Claims (7)

[Claims] 1. A main body, a top plate provided on an upper surface of the main body on which a cooker to be heated is placed, and a substantially flat coil base having an opening at a central portion on a lower surface side of the top plate. A plurality of stored heating coils, a support plate that supports the heating coils, a control board that controls the energization of the heating coils, an intake port on one of the upper portions of the main body,
On the other hand, an induction heating cooker including an exhaust port and a fan disposed below the intake port, and having a dedicated air passage for blowing air to the plurality of heating coils and the control board from an outlet of the fan. 2. The support plate below the heating coil has an inclined surface that inclines upward toward the heating coil from leeward to leeward of wind blown from the fan to the heating coil. Induction cooker. 3. The induction heating cooker according to claim 1, further comprising a partition plate outside the heating coil in a direction substantially the same as an air flow path to the heating coil, the partition plate being substantially perpendicular to the support plate. 4. A roaster is provided below the heating coil, and a support plate located above the roaster is provided, and the support plate is inclined upward from the windward side of the wind blown by the fan toward the downwind side of the heating coil. The induction heating cooker according to claim 1, further comprising an inclined surface. 5. The induction heating cooker according to claim 1, further comprising a top plate duct, which is independently blown by a fan, between the lower surface of the top plate and an upper portion of the front side of the main body. 6. The ventilation duct is provided between the lower surface of the top plate and the upper side of the front side of the main body, and the ventilation duct is provided with an opening on the top plate side.
Induction heating cooker according to the paragraph. 7. The induction heating cooker according to claim 6, wherein a heating display portion is provided in the ventilation duct.