JP6415475B2 - Induction heating cooker - Google Patents

Description

  The present invention relates to a heating coil that induction-heats an object to be heated and an induction heating cooker that includes an inverter circuit board that supplies a high-frequency current to the heating coil.

  Conventionally, various induction heating cookers including a heating coil that induction-heats an object to be heated and an inverter circuit board that supplies a high-frequency current to the heating coil have been proposed. In such an induction heating cooker, for example, as described in Patent Document 1, smoke of other members due to an abnormality of an inverter circuit board that supplies a high-frequency current to a heating coil, and spread of ignition In order to suppress this, there is one in which the periphery of the inverter circuit board is covered with a metal barrier. As a result, even if the electronic components and the heating elements of the inverter circuit board become abnormal and ignite by any chance, they are prevented from spreading to the surrounding flammable molded parts.

JP 2011-143112 A

  For such a metal barrier for the purpose of preventing the spread of fire, an iron-based material such as a steel plate having a high melting point is often used so as not to melt and open a hole due to a flame. However, since the iron-based material is a magnetic material, it is easily induction-heated by the leakage magnetic flux from the heating coil, which causes a loss. Therefore, as disclosed in Patent Document 1, it has been necessary to install a metal barrier in a place that is not easily affected by the heating coil such as the side surface of the housing. As a result, the induction heating cooker becomes large, and there is a problem in that the installation area when the induction heating cooker is installed on a desk or the like is increased, or the degree of freedom in housing design is restricted.

  The present invention has been made to solve the above problems, and induction heating cooking that can reduce the installation area and increase the degree of freedom of the housing design even when a metal barrier is arranged directly under the heating coil. The purpose is to provide a vessel.

An induction heating cooker according to the present invention includes a casing, a heating coil disposed inside the casing, an inverter circuit board that is disposed below the heating coil and supplies a high-frequency current to the heating coil. And a metal barrier disposed on at least the upper surface of the inverter circuit board, a magnetic shielding means made of a nonmagnetic metal disposed between the metal barrier and the heating coil, and the inside of the casing. An inner pot storage part, a temperature detection means for detecting the temperature of an object to be heated stored in the inner pot storage part, provided in a space formed through the inner pot storage part, and below the temperature detection means The magnetic shield means is configured to cover the entire upper surface of the metal barrier, and the magnetic shield means functions as the water receiver member .

  According to the induction heating cooker according to the present invention, the metal barrier and the magnetic shielding means of nonmagnetic metal provided on the upper part of the metal barrier are provided. It is possible to simultaneously prevent the spread of fire due to the ignition of the circuit board and the temperature rise of the metal barrier due to the leakage magnetic flux.

It is a schematic sectional drawing which shows an example of schematic structure of the induction heating cooking appliance which concerns on Embodiment 1 of this invention. It is a schematic perspective view which shows three-dimensionally an example of the structure of the metal barrier provided in the induction heating cooking appliance which concerns on Embodiment 1 of this invention, and a magnetic-shielding means. It is a schematic sectional drawing which shows another example of schematic structure of the induction heating cooking appliance which concerns on Embodiment 1 of this invention. It is a schematic perspective view which shows another example of a structure of the metal barrier provided in the induction heating cooking appliance which concerns on Embodiment 1 of this invention, and a magnetic-shielding means in three dimensions. It is a schematic sectional drawing which shows an example of schematic structure of the induction heating cooking appliance which concerns on Embodiment 2 of this invention. It is a schematic sectional drawing which shows an example of schematic structure of the induction heating cooking appliance which concerns on Embodiment 3 of this invention. It is a schematic perspective view which shows three-dimensionally an example of the structure of the magnetic-shielding means holding member and magnetic-shielding means provided in the induction heating cooking appliance which concerns on Embodiment 3 of this invention. It is a schematic sectional drawing which shows another example of schematic structure of the induction heating cooking appliance which concerns on Embodiment 3 of this invention. It is a schematic sectional drawing which shows another example of schematic structure of the induction heating cooking appliance which concerns on Embodiment 3 of this invention. It is a schematic perspective view which shows another example of a structure of the magnetic-shielding means holding member provided in the induction heating cooking appliance which concerns on Embodiment 3 of this invention in three dimensions. It is a schematic perspective view which shows another example of a structure of the magnetic-shielding means holding member provided in the induction heating cooking appliance which concerns on Embodiment 3 of this invention in three dimensions. It is a schematic sectional drawing which shows another example of schematic structure of the induction heating cooking appliance which concerns on Embodiment 3 of this invention.

Hereinafter, the induction heating cooking appliance which concerns on this invention is demonstrated using drawing.
In addition, the structure, control content, etc. which are demonstrated below are examples, and the induction heating cooking appliance which concerns on this invention is not limited to such a structure, control content, etc.
Further, the illustration of the fine structure is simplified or omitted as appropriate.
In addition, overlapping or similar descriptions are appropriately simplified or omitted.

Embodiment 1 FIG.
FIG. 1 is a schematic cross-sectional view showing an example of a schematic configuration of an induction heating cooker (hereinafter referred to as cooker body 100) according to Embodiment 1 of the present invention. Based on FIG. 1, a rice cooker will be described as an example of the cooker body 100.

  A cooker main body 100 shown in FIG. 1 includes a housing 1, an inner pot 2, an inner pot storage unit 3, a heating coil 4, an inverter circuit board 5, a control unit 6, a metal barrier 7, and a magnetic shielding means. 8, a cooling fan 9, a guide plate 10 (guide plates 10 a and 10 b), a power plug 11, and a lid 20.

The casing 1 is configured in a bottomed cylindrical shape, and the inner pot 2 is accommodated in the casing 1.
The inner pot 2 has a bottomed cylindrical shape with an open top, and is detachably provided in the inner pot storage portion 3 of the housing 1. Moreover, the inner pot 2 is a to-be-heated object, and is comprised with the preform | base_material which consists of aluminum etc. with high heat conductivity. A ferromagnetic material is applied to the outer surface of the inner pot 2 by coating, bonding, or the like, and is electromagnetically heated by energization of a high-frequency current to the heating coil 4 described later.
The inner pot storage part 3 is formed inside the housing 1 so that the inner pot 2 is detachably stored.

The heating coil 4 is provided inside the housing 1 and induction-heats the bottom and outer periphery of the inner pot 2 accommodated in the inner pot accommodating portion 3.
The inverter circuit board 5 supplies a high-frequency current to the heating coil 4. The inverter circuit board 5 converts the power supplied from the power plug 11 into a high frequency and supplies it to the heating coil 4 as a high frequency current.

  The control unit 6 is provided, for example, on the lid 20 and includes a display / operation unit (not shown) that accepts a cooking instruction from the user or a change in cooking content, and the inverter circuit board 5 with the instructed control content. Is driven and controlled. The control unit 6 includes, for example, a microcomputer, a readable / writable memory (RAM), a read-only memory (ROM), a timer (timer), and the like, and performs an operation according to an input signal and a stored program, and an inverter The circuit board 5 is controlled to adjust the output of the heating coil 4.

The metal barrier 7 is installed so as to cover the upper part and the side surface of the inverter circuit board 5, and is for suppressing smoke generation of other members due to the abnormality of the inverter circuit board 5 and the spread of fire.
The magnetic-shielding means 8 is installed so as to further cover at least a part of the metal barrier 7 located on the upper part of the inverter circuit board 5, and suppresses induction heating of the metal barrier 7.
The cooling fan 9 is provided inside the housing 1 and serves to cool the heating coil 4 and the inverter circuit board 5.

The induction plate 10 has a function as a guide for guiding the cooling air generated from the cooling fan 9 to the heating coil 4 and the inverter circuit board 5. The guide plate 10 a is provided, for example, on the downstream side of the cooling fan 9, and guides cooling air to both the heating coil 4 and the inverter circuit board 5. The guide plate 10 b is provided on the bottom surface of the housing 1, for example, and guides cooling air to the inverter circuit board 5.
The power plug 11 is connected to a power source (for example, a commercial power source) provided outside the cooker body 100 and supplies power supplied from the power source to the inverter circuit board 5.
The lid 20 is attached to the upper part of the housing 1 so as to be freely opened and closed.

  In addition, although the heating coil 4 and the inverter circuit board 5 and the inverter circuit board 5 and the control part 6 are each connected by the cable etc., they are not illustrated in FIG.

  FIG. 2 is a schematic perspective view three-dimensionally showing an example of the configuration of the metal barrier 7 and the magnetic shielding means 8 provided in the cooker body 100. Based on FIG. 2, the metal barrier 7 and the magnetic-shielding means 8 are demonstrated in more detail. Further, the flow of cooling air inside the casing 1 of the cooker body 100 will be described in more detail.

In order to cover the upper part and the side surface of the inverter circuit board 5, the metal barrier 7 is preferably configured in a box shape having an upper part and a side part as shown in FIG.
Moreover, the magnetic-shielding means 8 is comprised by the plate shape comprised smaller than the upper surface of the metal barrier 7, for example, as shown in FIG.

  As shown in FIG. 1, the inverter circuit board 5 is disposed immediately below the heating coil 4. Although not shown, the inverter circuit board 5 is composed of a rectifier diode, a capacitor, and a coil that convert commercial AC power into direct current, and is composed of a filter circuit, a switching element, a resonance capacitor, and the like that remove electrical noise, and generates high frequency power An inverter circuit for conversion is provided. As a switching element, IGBT etc. are mentioned, for example. Further, the rectifier diode and the switching element are provided with a heat sink for dissipating the self-heating.

The metal barrier 7 is for preventing any part from being heated to a member constituting the cooker other than the inverter circuit board 5 in the event that any of the components becomes hot due to a failure of the inverter circuit board 5 and smoke or fires. It is. Therefore, the metal barrier 7 is preferably made of a steel plate, for example, as a material having a high melting point that is not likely to be melted by flame. As described above, the metal barrier 7 is composed only of the upper part and the side part, and the bottom part is opened in order to cool the electronic components mounted on the inverter circuit board 5.
The magnetic shielding means 8 is for interrupting the leakage magnetic flux from the heating coil 4. Therefore, the magnetic-shielding means 8 is good to comprise as a nonmagnetic metal, for example, aluminum or copper, in order to prevent the loss by induction heating.

  As the cooling fan 9, for example, an axial fan is used, and is provided in the lower part of the cooking device body 100. Cooling air sucked from an air inlet (not shown) provided in the housing 1 by the cooling fan 9 is distributed to the heating coil 4 side and the inverter circuit board 5 side by the induction plate 10a. On the inverter circuit board 5 side, the cooling air is further guided by the guide plate 10b so that the cooling air hits the heat sink and other heat generating components of the inverter circuit board 5. The cooling air that has taken away heat from the heating coil 4 and the inverter circuit board 5 is finally discharged from an exhaust port (not shown) provided in the housing 1.

  With this structure, in the cooker main body 100, both the heating coil 4 and the inverter circuit board 5 can be cooled by the single cooling fan 9, so there is no need to use dedicated cooling fans for the heating coil 4 and the inverter circuit board 5, respectively. The cooker body 100 can be downsized.

  Thus, in the cooking appliance main body 100, the metal barrier 7 is provided in the upper surface and side surface of the inverter circuit board 5, and the bottom face part is an open state. Thereby, the cooling air can be applied to the inverter circuit board 5 from the bottom surface. Even if an electronic component of the inverter circuit board 5 is ignited, since the flame has a property of moving upward, the metal barrier 7 is provided on at least the upper surface of the inverter circuit board 5 or the side surface in addition to the upper surface, and the flame is the inverter circuit. This prevents leakage from the upper part of the substrate 5. On the other hand, since the possibility of a flame coming out from the lower surface of the inverter circuit board 5 is small, the lower surface portion has a structure in which a metal barrier is not provided for cooling the inverter circuit board 5.

  Therefore, in the cooker main body 100, in order to increase the cooling effect by applying a large amount of cooling air to the inverter circuit board 5, the inverter circuit board 5 is installed so that the heating component mounting surface of the inverter circuit board 5 faces downward. . Although not shown, a metal plate may be laid on the bottom of the housing 1 so that a component ignited from the inverter circuit board 5 does not spread even if it falls from the inverter circuit board 5. When the inverter circuit board 5 generates little heat and the inverter circuit board 5 does not need to be cooled, the lower surface side of the inverter circuit board 5 may be covered with the metal barrier 7.

The configuration of the induction heating cooker according to Embodiment 1 has been described above.
Next, the operation of the induction heating cooker according to Embodiment 1 will be described.
When the user gives an instruction to start heating such as a cooking instruction to the control unit 6 having a display / operation unit, the control unit 6 starts driving and controlling the inverter circuit board 5. The inverter circuit board 5 starts operating upon receiving a signal from the control unit 6 and supplies a high-frequency current to the heating coil 4. When a high-frequency current flows through the heating coil 4, an alternating magnetic field is generated from the heating coil 4, whereby a magnetic flux is given to the inner pot 2 that is an object to be heated. Thereby, an eddy current is generated in the inner pot 2, Joule heat is generated by the eddy current and the electric resistance of the inner pot 2, and the inner pot 2 is heated.

  Thus, when a high frequency current is supplied to the heating coil 4, a magnetic flux will generate | occur | produce from the heating coil 4, and the inner pot 2 will be heated with this magnetic flux. Not all the magnetic flux generated from the heating coil 4 is used for induction heating to the inner pot 2, and a part of the generated magnetic flux does not contribute to the heating of the inner pot 2, but becomes a so-called leakage magnetic flux and is radiated around. The This leakage magnetic flux passes through the magnetic shielding means 8. At this time, an electromotive force is generated in the magnetic shielding means 8 in a direction to cancel the change of the magnetic flux generated by the alternating magnetic field, and an eddy current flows. Since the magnetic flux generated by the eddy current cancels out the leakage magnetic flux generated from the heating coil 4, the influence of the leakage magnetic flux becomes very small for the metal barrier 7 installed in the lower part of the magnetic shielding means 8.

Here, suppose that the magnetic-shielding means 8 is not installed on the upper surface of the metal barrier 7.
In this case, the leakage magnetic flux passes directly through the metal barrier 7. As described above, since the metal barrier 7, which is a steel plate, is a magnetic material, it has a property of easily passing magnetic flux and has a high resistivity, so that heat loss due to eddy current is large. This causes a reduction in heating efficiency. The heating efficiency refers to the ratio of the electric power that contributes only to the heating of the inner pot 2 out of the electric power consumed by the entire cooker body 100.

Next, let us consider a case where only the magnetic-shielding means 8 is installed without the metal barrier 7 being installed, or a case where the same material as the magnetic-shielding means 8 is used as the metal barrier 7, for example, aluminum.
In this case, for example, as described above, if the metal barrier 7 is made of a steel plate, the melting point of the steel plate is generally said to be about 1500 ° C., whereas the melting point of aluminum is said to be about 660 ° C. Since it becomes less than half in comparison, there is a possibility of melting due to the ignition of the electronic component, and it may not be used as the metal barrier 7.

  Therefore, the cooker main body 100 has a double structure of the metal barrier 7 that prevents the spread of fire and the magnetic shielding means 8 that reduces the power loss in the metal barrier 7 in this way. That is, the cooker main body 100 has a double structure of the metal barrier 7 made of a metal member having a higher melting point than the nonmagnetic metal constituting the magnetic shield means 8 and the magnetic shield means 8.

  By doing so, in the cooker main body 100, it is possible to install the inverter circuit board 5 directly below the heating coil 4, which has been difficult in the past. That is, in the cooking device main body 100, even if the inverter circuit board 5 is installed immediately below the heating coil 4, even if the electronic components of the inverter circuit board 5 become hot due to a failure or the like, and emit smoke or fire, the metal barrier 7 Thus, it is possible to prevent the spread of fire to the surroundings, and it is possible to suppress induction heating of the metal barrier 7 by the magnetic-shielding means 8 and to suppress a decrease in heating efficiency.

  Therefore, according to the cooker main body 100, since the inverter circuit board 5 can be installed in the lower part of the heating coil 4 by providing the metal barrier 7 and the magnetic-shielding means 8, the cooker main body 100 can be reduced in size and the desktop It is possible to reduce the installation area when installing in the area. Moreover, the freedom degree of the design of the housing | casing 1 can be raised.

  FIG. 3 is a schematic cross-sectional view showing another example of the schematic configuration of the cooker main body 100. FIG. 4 is a schematic perspective view showing another example of the configuration of the metal barrier 7 and the magnetic shielding means provided in the cooker body 100 in a three-dimensional manner. Based on FIG.3 and FIG.4, the other structural example of the magnetic-shielding means 8 is demonstrated. In order to distinguish from the magnetic-shielding means 8 shown in FIG. 1 and FIG. 2 for convenience, FIG. 3 shows magnetic-shielding means 8A, and FIG. 4 shows magnetic-shielding means 8B.

  In the cooker main body 100 shown in FIG. 3, the structure of the magnetic-shielding means 8A differs from the magnetic-shielding means 8 of the cooker main body 100 shown in FIG. As shown in FIG. 3, for example, the magnetic shield 8 may be fixed and attached to the metal barrier 7 itself. In FIG. 3, the magnetic shield 8 is attached to the outside so as to cover the metal barrier 7, and the magnetic shield 8 is directly fixed to the metal barrier 7. Thereby, when attaching the magnetic-shielding means 8 inside the housing | casing 1 of the cooker main body 100, the fixing member for fixing the magnetic-shielding means 8 and the housing | casing 1 becomes unnecessary, and size reduction of the housing | casing 1 is attained further. Become.

  1 and 3 show an example in which a gap is provided between the metal barrier 7 and the magnetic-shielding means 8, but they may be installed so that they are in close contact with each other. For example, an aluminum tape may be used as the magnetic shielding means 8 and may be attached to the outer surface of the metal barrier 7. Thereby, the housing 1 can be further downsized.

  4, the configuration of the magnetic-shielding means 8B is different from the magnetic-shielding means 8 of the cooker main body 100 shown in FIG. 1 and the magnetic-shielding means 8A shown in FIG. 1 and 3 show an example in which the magnetic-shielding means 8 and the magnetic-shielding means 8A are configured in a plate shape, but the configuration of the magnetic-shielding means is not limited to these. For example, as shown in FIG. 4, similarly to the magnetic shield 8 </ b> B, an aluminum wire or a copper wire having one or more turns is provided between the heating coil 4 and the metal barrier 7. Can be obtained. Thereby, the temperature rise of the metal barrier 7 can be suppressed.

Embodiment 2. FIG.
FIG. 5 is a schematic cross-sectional view showing an example of a schematic configuration of an induction heating cooker (hereinafter referred to as cooker main body 110) according to Embodiment 2 of the present invention. Based on FIG. 5, a rice cooker will be described as an example of the cooker body 110. In the second embodiment, differences from the first embodiment will be mainly described, and the same parts as those in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

  In Embodiment 1, the metal member which consists of a double structure which provided the magnetic-shielding means 8 in the upper part of the metal barrier 7 of the inverter circuit board 5 was shown, and the form which prevents a fire spread and the induction heating of the metal barrier 7 was shown. In the second embodiment, in addition to the configuration of the first embodiment, the metal barrier 7 and the magnetic shielding means 8 in the case where the temperature sensor unit 12 that contacts the bottom of the inner pot 2 and detects the temperature of the inner pot 2 is provided. A configuration example will be described. The temperature sensor unit 12 includes the “temperature detection means” of the present invention.

  Specifically, the cooker body 110 has a temperature sensor unit 12 that is installed at the center of the bottom surface of the inner pot storage unit 3 and that contacts the bottom of the inner pot 2 to detect the temperature of the inner pot 2. The point different from the first embodiment is that a water receiving member is arranged between the portion immediately below the sensor unit 12 and the metal barrier 7. Although not shown, the temperature sensor unit 12 includes, for example, a thermistor for detecting the temperature, an aluminum case for housing the thermistor, a spring for pressing the aluminum case containing the thermistor against the inner pan, and a temperature signal from the thermistor. 6 and the like to be transmitted.

  The temperature sensor unit 12 is provided to detect the temperature of the inner pot 2, and the detected temperature signal is used as a feedback control signal for controlling the inverter circuit board 5 to obtain a desired inner pot temperature. In FIG. 5, the magnetic shielding means 8 is used as the water receiving member, and the outer area of the magnetic shielding means 8 is made larger than the upper surface area of the metal barrier 7. In addition, the water receiving member may be constituted by a member different from the magnetic shielding means 8 and provided separately from the magnetic shielding means 8.

  The temperature sensor unit 12 is provided in a space formed so as to penetrate from the bottom surface of the inner pot storage unit 3 to the heating coil 4 side. Therefore, for example, when the inner pot storage unit 3 is set in a state where the outer surface of the inner pot 2 is wet, the inner pot storage unit 3 is cleaned, or the inner pot 2 is perforated, the temperature sensor unit 12 and There is a possibility that the liquid (for example, water) adhering to the lower heating coil 4 from the gap in the inner pot storage part 3 leaks and falls. At this time, if the inverter circuit board 5 installed in the lower part is splashed with liquid, the inverter circuit board 5 may be in the worst case.

  Although not shown, the metal barrier 7 of the inverter circuit board 5 has a hole for passing a cable for communication with the control unit 6 or a connection cable for supplying a high-frequency current to the heating coil 4, or ventilation Normally, it is not completely sealed due to the formation of a mouth or the presence of a seam between sheet metal and sheet metal. Therefore, there is a possibility that liquid leaked from these minute gaps (hereinafter referred to as water) enters the inverter circuit board 5 side.

  Therefore, in the cooker main body 110 according to the second embodiment, the outer shape of the magnetic-shielding means 8 provided on the upper part of the metal barrier 7 is made larger than the upper area of the metal barrier 7, and viewed from the upper part of the cooker main body 110, The metal barrier 7 was completely covered.

Thereby, even if a water leak occurs from the gap between the temperature sensor unit 12 and the inner pot storage part 3, it is first received by the magnetic shielding means 8 functioning as a water receiving member. The water received by the magnetic shield means 8 then travels through the magnetic shield means 8 and falls from the end face of the magnetic shield means 8 to the lower part of the casing 1 of the cooker main body 110. This water is discharged to the outside through a drain port (not shown) provided in the lower part of the housing 1. The cooker main body 110 has such a mechanism.
Thus, in the cooker main body 110, in addition to the effect which the cooker main body 100 which concerns on Embodiment 1 show | plays, the magnetic-shielding means 8 plays the role of an umbrella with respect to the inverter circuit board 5 and the metal barrier 7, Therefore Inverter Water on the circuit board 5 can be prevented.

Embodiment 3 FIG.
FIG. 6 is a schematic cross-sectional view showing an example of a schematic configuration of an induction heating cooker (hereinafter referred to as cooker main body 120) according to Embodiment 3 of the present invention. FIG. 7 is a schematic perspective view three-dimensionally showing an example of the configuration of the magnetic-shielding means holding member 13 and the magnetic-shielding means 8 provided in the cooker main body 120. Based on FIG.6 and FIG.7, a rice cooker is demonstrated as an example as the cooker main body 120 below. In the third embodiment, differences from the first and second embodiments will be mainly described, and the same parts as those in the first and second embodiments will be denoted by the same reference numerals and the description thereof will be omitted.

  In Embodiment 2, the form which has arrange | positioned the water receiving member (magnetic-shielding means 8) directly under the temperature sensor unit 12 and the metal barrier 7 was shown. In the third embodiment, another configuration example for protecting the inverter circuit board 5 when water leaks from the gap between the temperature sensor unit 12 and the inner pot storage unit 3 will be described. Specifically, the cooker main body 120 is different from the second embodiment in that the magnetic-shielding means holding member 13 formed of, for example, resin is used as the water receiving member. The magnetic shield means holding member 13 corresponds to the “holding member” of the present invention.

  The magnetic-shielding means holding member 13 includes two connecting members 14A attached to the lower surface of the inner pot storage portion 3, and a flat portion 14B attached to the lower end of the connecting member 14A and the magnetic-shielding means 8 attached to the upper surface. It is configured. The magnetic shield 8 is attached to the upper surface of the flat portion 14B of the magnetic shield holding member 13, and the flat portion 14B is fixed inside the housing 1 by the connecting member 14A. That is, in the cooker main body 120, the inner pot storage unit 3 and the magnetic-shielding means holding member 13 are connected and fixed by the connecting member 14 </ b> A of the magnetic-shielding means holding member 13.

  Since the inverter circuit board 5 is installed immediately below the heating coil 4, a volume that allows the inverter circuit board 5 to be installed in the space below the heating coil 4 is required. Therefore, in the cooker main body 120, the magnetic-shielding means holding member 13 and the inner pot storage part 3 on the upper side of the magnetic-shielding means holding member 13 are connected by providing the magnetic-shielding means holding member 13. Thereby, compared with the case where the bottom face of the housing | casing 1 and the magnetic-shielding means holding member 13 are connected and fixed, for example, it becomes possible to ensure the space below the heating coil 4 widely. Therefore, according to the cooker main body 120, the inverter circuit board 5 can be installed while suppressing an increase in the size of the housing 1.

  Further, as shown in FIG. 7, the outer area of the magnetic-shielding means holding member 13 is made larger than the upper surface area of the metal barrier 7 so that the metal barrier 7 is completely covered when viewed from the top of the cooker main body 120. It is configured. Thereby, the effect similar to FIG. 2 can be acquired, without enlarging the area of the magnetic-shielding means 8. FIG.

Note that it is not necessary to cover the entire metal barrier 7 only with the flat surface portion 14B of the magnetic shield means holding member 13, and it is sufficient that either the flat surface portion 14B of the magnetic shield means holding member 13 or the magnetic shield means 8 covers the metal barrier. . Further, the metal barrier 7 may be entirely covered with a surface obtained by combining both the magnetic shield 8 and the flat portion 14B of the magnetic shield holding member 13. Therefore, for example, the magnetic-shielding means holding member 13 may be provided around the magnetic-shielding means 8, and the central portion may include only the magnetic-shielding means 8. That is, the magnetic shielding means 8 also functions as a part of the water receiving member.
Further, the inverter circuit board 5 and the metal barrier 7 installed on the lower side of the magnetic shield means holding member 13 may also be connected to the magnetic shield means holding member 13 and fixed.

  FIG. 8 is a schematic cross-sectional view showing another example of the schematic configuration of the cooker main body 120. Based on FIG. 8, another configuration example of the magnetic-shielding means holding member 13 will be described. In addition, in order to distinguish from the magnetic-shielding means holding member 13 shown in FIG.6 and FIG.7 for convenience, in FIG.8, it shows as magnetic-shielding means holding member 13A.

  As shown in FIG. 8, you may make it attach the magnetic-shielding means 8 to the lower surface of the plane part 14B of the magnetic-shielding means holding member 13A. In this way, when water leaks from the gap between the temperature sensor unit 12 and the inner pot storage portion 3, water is received by the flat portion 14B of the magnetic-shielding means holding member 13A formed of resin, It becomes a structure in which water is not applied directly to the constructed magnetic shield 8. Thereby, the rust and corrosion of the magnetic-shielding means 8 can be prevented.

  FIG. 9 is a schematic cross-sectional view showing still another example of the schematic configuration of the cooker main body 120. FIG. 10 is a schematic perspective view showing another example of the configuration of the magnetic-shielding means holding member 13 provided in the cooker main body 120 in a three-dimensional manner. Based on FIG.9 and FIG.10, the further another structural example of the magnetic-shielding means holding member 13 is demonstrated. In addition, in order to distinguish with the magnetic-shielding means holding member 13 shown in FIG.6 and FIG.7 for convenience, in FIG.9 and FIG.10, it shows as the magnetic-shielding means holding member 13B.

  As shown in FIG. 9, the cooker main body 120 has a magnetic-shielding means holding member 13B formed of, for example, resin as a water receiving member. The magnetic-shield means holding member 13B has a wall surface portion 13a for using the flat surface portion 14B as a saucer, and a drain port 15. The wall surface portion 13a is a wall with the outer peripheral portion of the flat surface portion 14B standing upward. The drain port 15 is an inner side of the wall surface portion 13a and is formed by penetrating a part of the flat surface portion 14B. And the magnetic-shield means 8 is laid inside the wall surface part 13a.

  When water leaks from the gap between the temperature sensor unit 12 and the inner pot storage unit 3, the water is first received by the flat surface part 14 </ b> B of the magnetic shield means holding member 13. Since the magnetic shield means holding member 13 has the wall surface portion 13a, water is blocked by the wall surface portion 13a and does not flow down from the magnetic shield means holding member 13. The water blocked by the wall surface portion 13a travels through the drain port 15 provided inside the wall surface portion 13a, falls to the lower portion of the casing 1 of the cooker main body 120, and the drain port provided at the lower portion of the casing 1 ( (It is not shown in the figure).

  Therefore, it is not necessary to make the outer shape of the planar portion 14B of the magnetic shield means holding member 13 and the magnetic shield means 8 larger than the upper surface of the metal barrier 7, and the metal barrier 7 is completely covered when viewed from the top of the cooker body 120. do not have to. Thereby, the planar part 14B of the magnetic-shield means 8 and the magnetic-shield means holding member 13 can be reduced in size. Moreover, since the flow of water can be controlled as compared with FIG. 8, it is easy to take measures against water on components (for example, a cooling fan) other than the inverter circuit board 5.

  FIG. 11 is a schematic perspective view three-dimensionally showing still another example of the configuration of the magnetic-shielding means holding member 13 provided in the cooker main body 120. Based on FIG. 11, still another configuration example of the magnetic shield means holding member 13 will be described. In addition, in order to distinguish with the magnetic-shielding means holding member 13 shown in FIG.9 and FIG.10 for convenience, in FIG. 11, it has shown as magnetic-shielding means holding member 13C.

  9 and 10 show an example in which the drain port 15 is formed in a part of the flat surface portion 14B. In FIG. 11, an open portion 16 having no wall surface is provided in at least one of the wall surface portions 13a. The case where the open part 16 is used as a drain outlet is shown.

  When water leaks from the gap between the temperature sensor unit 12 and the inner pot storage part 3, the water is first received by the flat surface part 14B of the magnetic-shielding means holding member 13C. Since the magnetic-shielding means holding member 13C has the wall surface portion 13a in which the open portion 16 is formed, water is blocked by the wall surface portion 13a and falls from the open portion 16 to the lower portion of the casing 1 of the cooker main body 120. It is a mechanism for discharging to the outside from a drainage port (not shown) provided at the lower part of the body 1.

  Thereby, the effect similar to the magnetic-shielding means holding member 13B shown in FIG.9 and FIG.10 can be acquired. In addition, the open part 16 is not limited to one place of the wall surface part 13a, and may be provided in a plurality of places, and not only a part of one side but the whole part may be the open part 16. Further, the shape of the open portion 16 is not limited to a quadrangle as shown in FIG. 11, and may be, for example, a circle.

  FIG. 12 is a schematic cross-sectional view showing still another example of the schematic configuration of the cooker main body 120. Based on FIG. 12, still another configuration example of the magnetic-shielding means holding member 13 will be described. In addition, in order to distinguish with magnetic-shielding means holding member 13C shown in FIG. 11 for convenience, in FIG. 12, it shows as magnetic-shielding means holding member 13D.

  As shown in FIG. 12, the magnetic-shielding means 8 may be laid on the lower surface of the flat portion 14B of the magnetic-shielding means holding member 13D. When water leaks from the gap between the temperature sensor unit 12 and the inner pot storage portion 3, water is received by the flat portion 14B of the magnetic-shielding means holding member 13D formed only of resin, so that the magnetic-shielding means is formed of a metal body. There is no direct water on 8. Thereby, the rust and corrosion of the magnetic-shielding means 8 can be prevented. In addition, about the shape of the drain port 15, the shape like the open part 16 shown, for example in FIG. 11 may be sufficient.

  As described above, in the induction cooking device having the temperature sensor unit 12 that is installed in the inner pot storage unit 3 and detects the temperature of the inner pot 2 by contacting the bottom of the inner pot 2, the lower part of the temperature sensor unit 12 Since the water receiving member is configured between the magnetic barrier 7 and the metal barrier 7, and the water receiving member is configured by the magnetic shielding means 8 or the magnetic shielding means holding member 13 as the water receiving member, the water splashing on the inverter circuit board 5 is prevented. be able to.

  As mentioned above, although the induction heating cooking appliance concerning this invention was divided and demonstrated to three embodiment, it is not limited to these, It can change or change variously, without deviating from the category and the mind of this invention. Moreover, you may comprise the induction heating cooking appliance combining the content demonstrated by each embodiment suitably. Here, although the rice cooker was demonstrated as an example, it is not limited to a rice cooker, For example, induction heating cookers, such as a stew cooker and a pressure cooker, may be sufficient.

  The induction heating cooker according to the embodiment of the present invention is disposed on the casing 1, the heating coil 4 disposed inside the casing 1, and the lower side of the heating coil 4. An inverter circuit board 5 for supplying the metal, a metal barrier 7 disposed on at least the upper surface of the inverter circuit board 5, and a magnetic-shielding means 8 made of a nonmagnetic metal disposed between the metal barrier 7 and the heating coil 4. Prepare.

  Therefore, according to the induction heating cooker according to the embodiment of the present invention, even if the inverter circuit board 5 and the metal barrier 7 are arranged directly below the heating coil 4 that is susceptible to leakage magnetic flux, at least the inverter circuit board. 5 is provided with a metal barrier 7 for preventing the spread of the substrate and a magnetic prevention means 8 of nonmagnetic metal, so that the spread of the inverter circuit substrate 5 due to the ignition is prevented, and the induction of the metal barrier 7 with the leakage magnetic flux is induced. The temperature rise due to can be suppressed at the same time. Therefore, the placement of the inverter circuit board immediately below the heating coil, which has been difficult to install, can be realized, and the housing 1 can be miniaturized, so that the installation area can be reduced when installing on a desk or the like. be able to. Moreover, the freedom degree of the design of the housing | casing 1 can be raised.

In the induction heating cooker according to the embodiment of the present invention, the metal barrier 7 is composed of a metal member having a higher melting point than the nonmagnetic metal that constitutes the magnetic shielding means 8.
Therefore, according to the induction heating cooker according to the embodiment of the present invention, the possibility of melting the metal barrier 7 by the flame can be significantly reduced.

In the induction heating cooker according to the embodiment of the present invention, the magnetic-shielding means 8 is configured in a plate shape or an annular shape.
Therefore, according to the induction heating cooker according to the embodiment of the present invention, without limiting to the plate-shaped magnetic shielding means 8, even if the aluminum wire or the copper wire is annularly wound one or more times, A similar magnetic shielding effect can be obtained.

The induction heating cooker according to the embodiment of the present invention is provided in an inner pot storage portion 3 formed inside the housing 1 and a space formed through the inner pot storage portion 3. 3 is provided with temperature detection means (temperature sensor unit 12) for detecting the temperature of the object to be heated (inner pot 2) housed in 3, and a water receiving member disposed below the temperature detection means. The magnetic barrier 7 is configured to cover the entire top surface of the metal barrier 7, and the magnetic shielding means 8 functions as a water receiving member.
Therefore, according to the induction heating cooker which concerns on embodiment of this invention, while being able to install the inverter circuit board 5 in the lower part of the heating coil 4, the water splash to the inverter circuit board 5 can be prevented. .

In the induction heating cooker according to the embodiment of the present invention, the magnetic shielding means 8 is fixedly attached to the metal barrier 7.
Therefore, according to the induction heating cooker which concerns on embodiment of this invention, the fixing member for fixing the magnetic-shielding means 8 and the housing | casing 1 becomes unnecessary, and size reduction of the housing | casing 1 becomes possible further.

The induction heating cooker according to the embodiment of the present invention is provided in an inner pot storage portion 3 formed inside the housing 1 and a space formed through the inner pot storage portion 3. 3 is provided with temperature detection means (temperature sensor unit 12) for detecting the temperature of the object to be heated (inner pot 2) housed in 3, and a water receiving member disposed below the temperature detection means, These are fixed by a holding member (magnetic-shielding means holding member 13) made of a resin material, and the holding member functions as a water receiving member.
Therefore, according to the induction heating cooker according to the embodiment of the present invention, by providing the magnetic-shielding means holding member 13, it is possible to secure a wide space below the heating coil 4 and increase the size of the housing 1. The inverter circuit board 5 can be installed while suppressing the above.

In the induction heating cooker according to the embodiment of the present invention, the holding member is attached to the lower surface of the connecting member 14A and the connecting member 14A attached to the lower surface of the inner pot storage portion 3, and the magnetic-shielding means 8B is connected to the upper surface or And a flat surface portion 14B attached to the lower surface.
Therefore, according to the induction heating cooker according to the embodiment of the present invention, the magnetic shield means holding member 13 and the inner pot storage portion 3 on the upper side of the magnetic shield means holding member 13 are connected. Compared to the case where the bottom surface of 1 and the magnetic-shielding means holding member 13 are connected and fixed, a wide space below the heating coil 4 can be secured.

The induction heating cooker according to the embodiment of the present invention covers the entire upper surface of the metal barrier 7 at least one of the magnetic shielding means 8B or the planar portion 14B when the magnetic shielding means 8B is attached to the upper surface of the planar portion 14B. .
Therefore, according to the induction heating cooker which concerns on embodiment of this invention, the water splash to the inverter circuit board 5 can be prevented.

In the induction heating cooker according to the embodiment of the present invention, the holding member (magnetic shield means holding member 13D) has a wall surface portion 13a formed with the outer peripheral portion of the flat portion 14B standing upward, and the flat portion 14B. Is formed with a drain port 15 for draining water blocked by the wall surface portion 13a.
Therefore, according to the induction heating cooker which concerns on embodiment of this invention, it is not necessary to make the external shape of the plane part 14B and the magnetic-shielding means 8 larger than the upper surface of the metal barrier 7, and it sees from the upper part of the cooker main body 120. The metal barrier 7 need not be completely covered. Thereby, the planar part 14B of the magnetic-shielding means 8 and the magnetic-shielding means holding member 13 can be reduced in size, and the countermeasure against water splashing to components other than the inverter circuit board 5 becomes easy.

In the induction heating cooker according to the embodiment of the present invention, the metal barrier 7 is configured in a box shape with an open bottom.
Therefore, according to the induction heating cooker according to the embodiment of the present invention, the cooling air can be applied to the inverter circuit board 5 from the bottom surface portion, and even when the electronic component of the inverter circuit board 5 is ignited, the flame is the inverter. It is possible to prevent leakage from the upper part of the circuit board 5 and to cool from the lower surface of the inverter circuit board 5.

  DESCRIPTION OF SYMBOLS 1 Case, 2 Inner pan, 3 Inner pan accommodating part, 4 Heating coil, 5 Inverter circuit board, 6 Control part, 7 Metal barrier, 8 Magnetic-shielding means, 8A Magnetic-shielding means, 8B Magnetic-shielding means, 9 Cooling fan, 10 Induction plate 10a induction plate, 10b induction plate, 11 power plug, 12 temperature sensor unit, 13 anti-magnetic means holding member, 13A anti-magnetic means holding member, 13B anti-magnetic means holding member, 13C anti-magnetic means holding member, 13D anti-magnetic means holding member, 13a wall surface Part, 14A connecting member, 14B plane part, 15 drainage port, 16 open part, 20 lid, 100 cooker body, 110 cooker body, 120 cooker body.

Claims (7)

A housing,
A heating coil disposed inside the housing;
An inverter circuit board disposed under the heating coil and supplying a high-frequency current to the heating coil;
A metal barrier disposed on at least an upper surface of the inverter circuit board;
A magnetic-shielding means made of a non-magnetic metal disposed between the metal barrier and the heating coil;
An inner pot storage portion formed inside the housing;
A temperature detecting means for detecting a temperature of an object to be heated, which is provided in a space formed through the inner pot storing portion and stored in the inner pot storing portion;
A water receiving member disposed below the temperature detecting means,
The magnetic shielding means includes
It is configured to cover the entire upper surface of the metal barrier,
The induction heating cooker in which the magnetic shielding means functions as the water receiving member. The magnetic shielding means includes
The induction heating cooker according to claim 1 , wherein the induction heating cooker is fixedly attached to the metal barrier. A housing,
A heating coil disposed inside the housing;
An inverter circuit board disposed under the heating coil and supplying a high-frequency current to the heating coil;
A metal barrier disposed on at least an upper surface of the inverter circuit board;
A magnetic-shielding means made of a non-magnetic metal disposed between the metal barrier and the heating coil;
An inner pot storage portion formed inside the housing;
A temperature detecting means for detecting a temperature of an object to be heated, which is provided in a space formed through the inner pot storing portion and stored in the inner pot storing portion;
A water receiving member disposed below the temperature detecting means,
The magnetic shielding means includes
It is fixed by a holding member made of resin material,
The induction heating cooker in which the holding member functions as the water receiving member. The holding member is
A connecting member attached to the lower surface of the inner pot storage unit;
The induction heating cooker according to claim 3 , wherein the induction heating cooker is attached to a lower end of the connecting member, and the magnetic shield means is a flat portion attached to an upper surface or a lower surface. In what the magnetic shield means is attached to the upper surface of the flat portion,
The induction heating cooker according to claim 4 , wherein all of the upper surface of the metal barrier is covered with at least one of the magnetic shielding means or the flat portion. The holding member is
It has a wall surface portion that is formed with the outer peripheral portion of the flat surface portion standing upward,
The induction heating cooker according to claim 4 or 5 , wherein a drainage port for draining water blocked by the wall surface portion is formed in the planar portion. The metal barrier is
The induction heating cooker according to any one of claims 1 to 6 , wherein the induction heating cooker is configured in a box shape having an open bottom portion.

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