JP2010073385A - Induction heating cooking appliance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an induction heating cooking appliance high in reliability and high in the cooling efficiency of induction heating coils. <P>SOLUTION: By arranging the induction heating coils, ferrite, and a base plate thermally connected by a highly thermally conductive cooking member, the induction heating cooking appliance high in reliability and high in the cooling efficiency of the induction heating coils is provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a built-in type and a stationary type induction heating cooker equipped with an induction heating device used in general households and the like.

  Conventionally, this type of induction heating cooker requires an increase in input power in order to obtain a high heating power. However, when the heating power is increased, the heat loss of the induction heating coil and the like also increases. The heat generation of the components increases. Therefore, a highly efficient cooling structure that keeps these parts below an allowable temperature has been studied.

  As a conventional example, a first heating coil for induction heating a pan made of a low resistance and low permeability material and a second heating coil for induction heating a pan made of a high resistance and high permeability material are provided below the top plate. There is one provided with a heating coil cooling device that directly cools the first heating coil (see, for example, Patent Document 1).

According to the induction heating cooker, induction heating can be efficiently performed without being restricted by the material of the pan, from the pan of the low resistance and low permeability material to the pan of the high resistance and high permeability material without being caught by the material of the pan. can do. On the other hand, during induction heating, a heating coil that induction-heats a pan made of a material with low resistance and low permeability has a large output and generates a large amount of heat, but it is cooled directly by a dedicated heating coil cooling device. A good cooling state.
JP 2005-302735 A

  However, the conventional configuration requires a dedicated fan for cooling the induction heating coil. Even when the dedicated fan is not provided, the cooling air for cooling the substrate components or the like is used for cooling the induction heating coil. For example, it was necessary to distribute it to the factory, which resulted in higher costs and higher noise. Moreover, there existed a subject that cooling efficiency was low because the high temperature air after cooling an induction heating coil stagnates inside an induction heating cooking appliance.

  The present invention solves the above-described conventional problems, and the induction heating coil, the ferrite, and the base plate are arranged to be thermally connected to each other by a high thermal conductivity member so that the cooling efficiency of the induction heating coil is high and reliable. It aims at providing a high induction heating cooking appliance.

  In order to solve the conventional problems, an induction heating cooker according to the present invention includes a main body, a top plate on the upper surface of the main body, a plurality of induction heating coils below the top plate, ferrite, the induction heating coil, and ferrite. The induction heating cooker has a coil base that supports the base plate and a base plate on which the coil base is placed, and the induction heating coil, the ferrite, and the base plate are arranged by being thermally connected by a high thermal conductivity member. .

With the above configuration, it is possible to reduce the temperature of the induction heating coil by transmitting the heat loss of the induction heating coil to the ferrite and transferring the heat from the ferrite to the base plate by heat conduction. Since the induction heating coil, the ferrite, and the base plate are thermally connected by a high thermal conductivity member, the thermal resistance of the contact surface can be lowered and heat can be transferred efficiently. The induction heating coil is made of copper, and ferrite is mainly composed of iron oxide, and its thermal conductivity is higher by one digit or more than plastic. When the base plate is made of aluminum, since the ferrite is ceramic, the heat resistance is larger than that of the induction heating coil and the base plate, but the heat loss from the induction heating coil is increased and reduced by increasing the number of ferrite and increasing the heat transfer area. As described above, heat can be transferred to the base plate. By ensuring the surface area of the aluminum base plate to be larger than the required area calculated from the heat generation amount of the induction heating coil, the temperature of the induction heating coil can be suppressed to a reference temperature or lower.

  The induction heating cooker of the present invention has a configuration in which the induction heating coil, the ferrite, and the base plate are arranged in a thermally connected state by a high thermal conductivity member so that the induction heating coil has high cooling efficiency and high reliability. Can be used as a container.

  1st invention mounts the main body, the top plate of the said body upper surface, the several induction heating coil under the said top plate, a ferrite, the coil base which supports the said induction heating coil and ferrite, and the said coil base The induction heating coil is configured such that the induction heating coil, the ferrite, and the base plate are thermally connected to each other by a high thermal conductivity member to transmit the heat loss of the induction heating coil to the ferrite. It is possible to reduce the temperature of the induction heating coil by transmitting the heat to the coil. Since the induction heating coil, the ferrite, and the base plate are thermally connected by a high thermal conductivity member, the thermal resistance of the contact surface can be lowered and heat can be transferred efficiently. Therefore, the temperature of the induction heating coil can be suppressed to a reference temperature or lower, and the induction heating cooker having high cooling efficiency and high reliability can be obtained.

  According to the second aspect of the invention, in particular, by using an induction heating cooker in which the base plate in the first aspect of the invention is provided with heat dissipation means, the base plate can be efficiently cooled, and the heat loss of the induction heating coil can be efficiently radiated. It becomes possible. For example, by forcibly cooling the base plate, it can be designed to be smaller than the surface area of the base plate calculated from the heating value of the induction heating coil in the case of natural air cooling, improving the degree of freedom of component placement inside the induction heating cooker It becomes possible.

  In the third aspect of the invention, in particular, the heat radiation means in the second aspect of the invention is an induction heating cooker configured to provide fins made of a metal material having high thermal conductivity, thereby increasing the surface area by making it into a fin shape. The amount of heat radiation can be increased by improving the thermal conductivity by using a metal material. Therefore, the temperature of the induction heating coil can be further reduced, and the induction heating cooker having high cooling efficiency and high reliability can be obtained.

  In the fourth aspect of the invention, in particular, by using an induction heating cooker that blows air to the heat dissipating means in the third aspect of the invention, more heat can be transmitted from the base plate to the cooling air by heat transfer, and the heat dissipation can be further increased. Can be bigger. Therefore, the temperature of the induction heating coil can be further reduced, and the induction heating cooker having high cooling efficiency and high reliability can be obtained.

  In the fifth invention, in particular, the base plate in the first to fourth inventions is an induction heating cooker made of a metal material, so that heat transfer from the ferrite to the base plate is smooth because the thermal conductivity is one digit higher than that of ferrite. The amount of electric heat from the induction heating coil to the base plate can be further increased. Therefore, the temperature of the induction heating coil can be further reduced, and the induction heating cooker having high cooling efficiency and high reliability can be obtained.

  The sixth aspect of the invention is an induction heating cooker configured such that the induction heating coil, ferrite, coil base, and base plate in the first to fifth aspects of the invention are electrically separated, so that the withstand voltage of the induction heating coil can be reduced. By ensuring and improving safety, a more reliable induction heating cooker can be obtained.

  In the seventh invention, in particular, the high thermal conductivity member in the first to sixth inventions is an induction heating cooker made of a material having high resistance or insulation, thereby ensuring the withstand voltage of the induction heating coil, The cooling efficiency of the induction heating coil can be improved, and a more reliable induction heating cooker can be obtained.

  In the eighth aspect of the invention, in particular, the base plate in the first to seventh aspects of the invention can be made to conduct heat from the base plate to the main body by using an induction heating cooker arranged in thermal connection with the main body. Since the main body is placed or built in the kitchen, the conduction heat transferred to the main body is dissipated from the main body by heat conduction or heat transfer to the air around the kitchen or the main body. Therefore, the temperature of the induction heating coil can be further reduced, and the induction heating cooker having high cooling efficiency and high reliability can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows a perspective view of an induction heating cooker according to the first embodiment of the present invention. FIG. 2 is an aa cross-sectional view of the induction heating cooker according to the first embodiment of the present invention. FIG. 3 is a cross-sectional perspective view of a main part of the induction heating cooker according to the first embodiment of the present invention. FIG. 4 is a bb cross-sectional view of the induction heating cooker in the first embodiment of the present invention. FIG. 5 is a cc enlarged cross-sectional view of the induction heating cooker in the first embodiment of the present invention.

  1-5, the induction heating cooking appliance main body 1 (henceforth abbreviated as the main body 1) is installed in the upper part of the kitchen stand which is not shown in figure. The upper surface of the main body 1 is covered with a top plate 2 made of crystallized glass. On the top plate 2, heating portions 3a, 3b, and 3c are printed. An intake port 4 is disposed at the rear of the main body 1 behind the top plate 2. Heating means 5a, 5b and 5c constituting induction heating means are disposed inside the main body corresponding to the heating units 3a, 3b and 3c.

  Below the heating means 5b on the left side of the main body 1, a heating chamber 6 which is a heating chamber for heating fish and the like is disposed. Beside the heating chamber 6 and below the right heating means 5a are heating means power supply circuits 7a, 7b and 7c for electrically operating the heating means 5a, 5b and 5c, and a blower for sucking air outside the main body 1. Means 8 are provided. The air blowing means 8 includes a fan 9 that is a centrifugal fan and a motor 10, the axial direction of the fan 9 is a horizontal direction, the casing 11 of the fan 9 has a suction port 12 and a plurality of air outlets 13 a and 13 b. The at least one air outlet 13a is arranged in a direction coinciding with the axial direction of the air blowing means 8, and the cooling air is blown out toward the heating means power supply circuits 7a, 7b, 7c, and the other air outlet 13b is set to the radius of the air blowing means 8. The cooling air is blown out toward the heating means 5a, 5b, 5c and the top plate 2 by being arranged in the direction.

  The heating means 5 a, 5 b, and 5 c include an induction heating coil 14, a coil sheet 15, a ferrite 16, and a coil base 17 that supports the induction heating coil 14 and the ferrite 16. In addition, a base plate 18 on which the coil base 17 is placed is provided below the coil base 17.

The induction heating coil 14 includes two coils having different outer diameters, which are made of litz wire, inside and outside,
A magnetic line is generated by a current supplied from a high-frequency power source (not shown), and an eddy current is generated in a pan (not shown) placed on 3a, 3b, 3c by the magnetic line of force, and the pan (not shown) itself. Heat up. The ferrite 16 is made of highly permeable ferrite, and is composed of several rod-shaped ones. The ferrite 16 is arranged on the coil base 17 radially from the center below the induction heating coil 14, and the lines of magnetic force generated from the induction heating coil 14 are below. The pot is efficiently heated by concentrating the lines of magnetic force on the upper side of the top plate 2.

  The heating means 5a, 5b, and 5c are respectively placed on the base plate 18 with the base sheet 19 interposed therebetween, and each is thermally connected and closely attached.

  The base plate 18 is made of an aluminum plate having a thickness of about 2 mm, and the coil sheet 15 and the base sheet 19 are made of a material having high thermal conductivity and insulation. In this embodiment, a flexible sheet mainly composed of silicon is used. Using.

  Further, the air blowing means 8 is disposed behind the heating means power circuit and below the air inlet 4, and the diameter of the fan 9 is increased by setting the air inlet 12 of the casing 11 to the back side of the main body 1. To be able to. As a result, since a large amount of air can be blown with a small number of rotations, the cooling performance is improved and the noise is reduced. Note that the fan 9 may be a fan such as a turbo fan, a radial fan, or a multi-blade fan.

  The front surface of the main body 1 includes a heating chamber door 20 and a cover 21 that covers the front surface of the main body 1 on the side of the heating chamber door 20.

  An operation unit 22 is disposed in front of the top plate 2. An exhaust port 23 is disposed at the rear of the main body 1 behind the top plate 2. In addition, a control unit (not shown) is provided, and the heating unit power supply circuit is controlled by a signal input from the operation unit 22 to adjust the outputs of the heating units 5a, 5b, 5c and the blowing unit 8.

  About the induction heating cooking appliance comprised as mentioned above, the operation | movement and an effect | action are demonstrated.

  The arrows in FIGS. 1 and 3 indicate the intake and exhaust directions. The arrows in FIG. 2 indicate the path of the cooling air. The arrows in FIG. 4 indicate the heat conduction path. First, when the user places a pan (not shown) on the heating unit and operates the operation unit 22 to start cooking, the control unit sends an operation signal to the heating unit power supply circuit to start feeding the heating unit. When a high-frequency current flows through the induction heating coil, heat is generated due to coil loss, and this loss heat is transmitted to the ferrite 16 through the coil sheet 15 by heat conduction and further transmitted to the base plate 18 through the base sheet 19.

  At the same time, in order to cool the heating means power supply circuit accompanied by heat generation, an operation signal is also sent to the blowing means 8 to start feeding the blowing means 8.

  When the air blowing means 8 is driven, outside air enters from the air inlet 4 provided behind the top plate 2 and passes through the air inlet 12 of the air blowing means 8. Part of the air taken in by the air blowing means 8 passes through the air outlet 13a provided in a direction that coincides with the axial direction of the air blowing means 8, and is blown out toward the heating means power supply circuits 7a, 7b, 7c, and the induction heating coil Heating components such as switching elements and diode bridges that constitute the drive circuit unit for driving 5a, 5b, and 5c are cooled, and the main body 1 is cooled while coming out sideward, forward, and upward. Discharged.

Further, a part of the air taken in by the air blowing means 8 passes through the air outlet 13b provided in the radial direction of the air blowing means 8, is blown to the lower surface of the base plate 18 and cooled, and then the air outlet 2
3 is discharged out of the main body 1.

  With the above configuration, the heat of the induction heating coil 14 is transferred to the ferrite 16 and transferred from the ferrite 16 to the base plate 18 by heat conduction, so that the temperature of the induction heating coil 14 can be lowered. Since the induction heating coil 14, the ferrite 16, and the base plate 18 are thermally connected by the coil sheet 15 and the base sheet 19 which are high thermal conductivity members, the thermal resistance of the contact surface can be lowered and heat can be efficiently generated. Can be communicated. The induction heating coil 14 is made of copper, and the ferrite 16 is mainly composed of iron oxide, and its thermal conductivity is higher by one digit or more than that of plastic or the like that is a material of the coil base 18. Since the base plate 18 is made of aluminum and the ferrite 16 is ceramic, the heat resistance is larger than that of the induction heating coil 14 and the base plate 18, but the number of the ferrites 16 is increased to increase the heat transfer area of the induction heating coil 14. Loss heat can be transferred to the base plate 18 more than necessary and sufficient. By ensuring the surface area of the base plate 18 to be equal to or larger than the required area calculated from the amount of heat generated by the induction heating coil 14, the temperature of the induction heating coil 14 can be suppressed to a reference temperature or lower. Therefore, the temperature of the induction heating coil 14 can be suppressed to a reference temperature or lower, and the induction heating cooker having high cooling efficiency and high reliability can be obtained.

  Further, by providing the base plate 18 with the fins 24 made of a metal material having a high thermal conductivity, the base plate 18 can be efficiently cooled, and the heat loss of the induction heating coil 14 can be efficiently radiated. The fins 24 are forcibly cooled and can be designed to be smaller than the surface area of the base plate 18 calculated from the amount of heat generated by the induction heating coil 14 in the case of natural air cooling, thereby improving the degree of freedom of component placement inside the main body 1. It becomes possible.

  In addition, the base plate 18 can be thermally conducted from the base plate 18 to the main body 1 by being thermally connected to the main body 1. Since the main body 1 is placed or built in a kitchen (not shown), the conduction heat transferred to the main body 1 is dissipated from the main body 1 by heat conduction or heat transfer to the air around the kitchen or the main body 1. Therefore, the temperature of the induction heating coil 14 can be further lowered, and the induction heating cooker having high cooling efficiency and high reliability can be obtained.

  As described above, the induction heating cooker according to the present invention is configured such that the induction heating coil, the ferrite, and the base plate are arranged by being thermally connected by the high thermal conductivity member, so that the cooling efficiency of the induction heating coil is high and reliable. Therefore, it can be applied to uses such as forced-air-cooling heating cooking appliances.

The perspective view of the induction heating cooking appliance in Embodiment 1 of this invention Sectional view aa of the induction heating cooking appliance in Embodiment 1 of this invention Cross-sectional perspective view of relevant parts of the induction heating cooker in Embodiment 1 of the present invention The principal part expanded sectional view of the induction heating cooking appliance in Embodiment 1 of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Induction heating cooker main body 2 Top plate 3a, 3b, 3c Heating part 4 Intake port 5a, 5b, 5c Heating means 6 Heating chamber 7a, 7b, 7c Heating means power supply circuit 8 Blower means 9 Fan 10 Motor 11 Casing 12 Inlet 13a, 13b Outlet 14 Induction heating coil 15 Coil sheet 16 Ferrite 17 Coil base 18 Base plate 19 Base sheet 20 Heating chamber door 21 Cover 22 Operation part 23 Exhaust port 24 Fin

Claims (8)

A main body, a top plate on the upper surface of the main body, a plurality of induction heating coils below the top plate, a ferrite, a coil base that supports the induction heating coil and the ferrite, and a base plate on which the coil base is placed. An induction heating cooker in which the induction heating coil, ferrite, and base plate are arranged to be thermally connected by a high thermal conductivity member. The induction heating cooker according to claim 1, wherein a heat radiating means is provided on the base plate. The induction heating cooker according to claim 2, wherein the heat dissipating means includes a fin made of a metal material having high thermal conductivity. The induction heating cooker according to claim 3, wherein the heat radiation means is blown. The induction heating cooker according to any one of claims 1 to 4, wherein the base plate is made of a metal material. The induction heating cooker according to any one of claims 1 to 5, wherein the induction heating coil, the ferrite, the coil base, and the base plate are configured to be electrically separated. The induction heating cooker according to any one of claims 1 to 6, wherein the high thermal conductivity member is made of a material having high resistance or insulation. The induction heating cooker according to any one of claims 1 to 7, wherein the base plate is arranged to be thermally connected to the main body.

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