JP5030886B2 - Induction cooking device - Google Patents

Description

  The present invention relates to a cooking device that performs cooking using an electromagnetic induction heating source. The induction heating type cooking device targeted by the present invention is used as a stationary type installed on kitchen furniture such as a kitchen sink and incorporated in an installation space formed in the kitchen furniture. Of one or both of what are referred to as built-in or built-in.

  As a conventional induction heating cooking apparatus, there is a heating cooking apparatus that heats the upper surface portion of a top plate with one or a plurality of electromagnetic induction heating sources (see, for example, Patent Document 1).

Japanese Patent No. 3997895

  However, in a conventional cooking device, a large multi-blade centrifugal fan that constitutes a blower is installed in one space inside the main body, outside air is introduced by this fan, and an inverter circuit component installed in the space In other words, the IH heating coil part and the power supply board part were sent in the order of cooling. Therefore, the cooling air guided to the highest temperature IH coil part is heated by the heat of the inverter circuit component in the previous stage, and there is a problem that the IH coil part which is the original heating target cannot be sufficiently cooled. . In order to solve this problem, it is possible to use a blower with a large blowing capacity or to increase the driving power to increase the blowing capacity. However, this increases costs, increases operating noise, and increases power consumption. Another problem such as this occurred and was not practical. Therefore, there has been a problem that it is desired to cool the IH coil portion effectively without impairing the cooling efficiency of the electric parts of the inverter circuit as much as possible. In addition, there is a problem of improving the cooling effect of the power supply board.

  The present invention has been made in order to solve the above-described problems, and can effectively cool the IH coil portion that reaches a high temperature and can also improve the cooling effect of the inverter circuit board and the power supply board. An object is to provide a cooking device.

The cooking device according to the present invention is
A main body case in which an induction heating source and a blower are housed and a grill heating chamber is formed;
A top plate covering the upper surface of the main body case;
The induction heating type heat source disposed below the top plate;
A front part case that is disposed below the top plate at the front of the main body case and stores at least a display device that displays the heating power during induction cooking or a substrate on which the display device is mounted;
A circuit board on which an inverter circuit for supplying high-frequency power to the induction heating source is mounted;
The blower for supplying cooling air to the internal space of the body case;
The grill heating chamber formed below the induction heating source;
An exhaust chamber partitioned into a rear portion in the main body case and having a terminal portion communicating with an external space;
An upper part chamber that is located behind the front part case and above the grill heating chamber, the induction heating type heat source and the power supply board are arranged, and communicated with the exhaust chamber ;
The main body case has cooling chambers extending in the front-rear direction on the right and left sides of the grill heating chamber and isolated from the grill heating chamber, respectively.
Each cooling chamber includes a fan case having the blower therein and an outside air suction port and a blowout port, and a component case in which cooling air discharged from the fan case is introduced and the circuit board is accommodated. And install
A cooling duct that communicates the component case with the lower space of the induction heating source;
Wherein the cooling duct, the cooling air supplied from the component case, a first ejecting hole for supplying to said power supply board, and the second ejecting holes supplied to the induction heating type heat source, said front part With a vent to be supplied to the case ,
The component case is provided with a first exhaust port and a second exhaust port on the downstream side of the first exhaust port in the flow of cooling air,
Wherein the first ejecting hole, the supply cooling air from the first exhaust port in the component case, wherein the second ejection hole and the vent hole, the second exhaust in said component case Supply cooling air from the mouth,
Air that has cooled the display device and exited from the front part case passes through the upper part chamber, exited from the first ejection hole, cooled the power supply board, and exited from the second ejection hole. Then, together with the air that has cooled the induction heating type heat source, it is discharged from the exhaust chamber to the outside of the main body case.

  The present invention is configured as described above, so that it is possible to effectively cool the induction heating source and the power supply board simultaneously with fresh air while cooling the inverter circuit components and the like.

Embodiment 1 FIG.
Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. FIGS. 1-8 is a figure regarding the heating cooking apparatus which concerns on Embodiment 1 of this invention, and shows the induction heating cooking apparatus called a built-in type or a built-in type here. 1 is a perspective view of a state where a part of the cooking device is disassembled, FIG. 2 is a perspective view of the entire main body with the top plate removed, and FIG. 3 is a plan view of the entire main body. 4 is an exploded perspective view in a state where main components such as upper and lower partition plates are removed, FIG. 5 is a vertical cross-sectional view taken along line VV in FIG. 1, FIG. 6 is a vertical cross-sectional view taken along line VI-VI in FIG. FIG. 8 is a schematic configuration diagram of a cooking device driving circuit, and FIG. 8 is a longitudinal sectional view showing an upper part on the front side of the main body. In the drawings, the same or corresponding parts are denoted by the same reference numerals.

(Overall configuration of cooking device)
The heating cooking apparatus according to Embodiment 1 is configured around a substantially rectangular main body A. The top surface of the main body A has a top plate B (reference numerals 20 and 21 in the figure), and the periphery other than the upper surface of the main body A is surrounded by a casing C (reference numeral 2 in the figure). . The main part A is a heating means for heating a pan, food, etc. with electric energy or the like (reference numerals 6LC, 6RC, 7 etc. in the figure), an operating means operated by a user (reference numerals 60, 61 in the figure) , A control means (reference numeral 200 in the figure) for controlling the heating means in response to a signal from the operation means, and a display device G (reference numeral 100 in the figure) for displaying the operating conditions of the heating means. In this example, as a part of the heating means, an electric heating means (reference numerals 22 and 23 in the figure) called a grill heating chamber or a roaster is provided.

  The operating conditions of the heating means refer to electrical and physical conditions for heating, and collectively refers to energization time, energization amount, heating temperature, energization pattern (continuous energization, intermittent energization, etc.) and the like.

  Display means that the user is informed of operating conditions and related information that is useful for cooking (changes in characters, symbols, illustrations, colors, presence / absence of light emission, light emission brightness, etc.) Including the target, hereinafter simply referred to as “cooking related information”).

  The display device includes a liquid crystal (LCD) and various light emitting elements (LED, LD (Laser Diode), organic electroluminescence (EL) element, etc.).

  The notification is an operation for notifying the user of the operation conditions of the control means and cooking-related information by display or electrical sound (refers to electrically generated or synthesized sound).

  Unless otherwise specified, the notification means includes notification means using audible sounds such as a buzzer and a speaker, and notification means using characters, symbols, illustrations, or visible light.

  The main body portion A is formed in a substantially square or rectangular shape with a predetermined size according to a space and a size that covers the installation opening K1 formed in the kitchen furniture KT such as a sink.

  As shown in FIG. 2, “2” is a main body case constituting the casing C, and a body 2 </ b> A formed by bending a single flat metal plate with a press molding machine a plurality of times, and the body 2 </ b> A. The front flange plate 2B made of a metal plate joined together by fixing means such as welding, rivets or screws is provided at the end of the part, and the front flange plate 2B and the body portion 2A are fixed by the fixing means. In the combined state, it becomes a box shape with an open top surface.

  The body case 2 has flanges formed by integrally bending outwardly into an L-shape at the rear end portion, right end portion, and left end portion of the upper surface opening, 3B is a rear flange, and 3L is a left side. The flange 3R is a right flange, and these three flanges and the front flange plate 2B are placed on the upper surface of the installation part (see FIG. 6) of the kitchen furniture KT to support the load of the cooking device.

  When the cooking device is completely accommodated in the installation opening K1 of the kitchen furniture KT, the front portion of the cooking device is exposed from the opening KTK formed in front of the kitchen furniture KT, and the front side of the kitchen furniture KT is exposed. The front (left and right) operation unit 60 of the cooking device can be operated.

  “2S” is an inclined surface connecting the back surface and the bottom surface of the body portion 2A. When the cooking apparatus is installed in the kitchen furniture KT, it collides with or interferes with the rear edge of the installation opening K1 of the kitchen furniture KT. Cut so as not to. That is, when this type of cooking apparatus is installed in the kitchen furniture KT, the cooking apparatus is tilted so that the front side of the main body A of the cooking apparatus is downward, and in this state, the installation opening K1 of the kitchen furniture KT from the front side to the front side. Drop into. After that, the rear side is dropped into the installation port K1 so as to draw an arc. Such an installation method is described in detail, for example, in JP-A-11-121155. For such an installation method, the front flange plate 2B has a sufficient space SP between the front edge of the installation opening K1 of the kitchen furniture KT when the cooking device is installed in the kitchen furniture KT. (See FIG. 8).

  Inside the main body case 2, IH coils 6LC and 6RC, which are induction heating sources for inductively heating an object to be heated N such as a metal pan placed on a top plate 21, which will be described later, and heating by electric radiation heat An electric heater, for example, a central heating source 7 called a radiant heater, a control device for controlling the cooking conditions of these heating sources, an operating means for inputting the cooking conditions to the control device, and the heating input by the operating means And a display device 100 for displaying the operating conditions of the means. Hereinafter, each will be described in detail.

  The inside of the main body case 2 is divided into a right cooling chamber 8R and a left cooling chamber 8L, a box-shaped grille (or roaster) heating chamber 9, an upper part chamber 10, and a rear exhaust chamber 12 which are broadly extended in the front-rear direction. Is formed. The rooms are not completely isolated from each other, and, for example, the right cooling chamber 8R, the left cooling chamber 8L, the upper part chamber 10 and the exhaust chamber 12 communicate with each other.

  The grill heating chamber 9 is a substantially independent sealed space when the door 13 to be described later is closed, but communicates with the external space of the main body case 2 via the exhaust duct 14, that is, the indoor space such as a kitchen. Yes.

  The top plate portion B is composed of two large parts, an upper frame (also referred to as a frame) 20 and a top plate (also referred to as an upper plate, top glass, and top plate) 21. The entire upper frame 20 is formed in a frame shape from a metal plate such as a nonmagnetic stainless steel plate or an aluminum plate, and has a size that closes the upper surface opening of the main body case 2. The upper frame 20 is fixed to the main body case 2 with a fixing tool such as a screw.

The top plate 21 is placed so as to cover a large opening provided in the center of the upper frame 20. The top plate 21 is entirely made of a translucent material that transmits infrared rays, such as heat-resistant tempered glass or crystallized glass, and is formed in a rectangle or a square according to the shape of the opening 20A of the upper frame 20.
Further, the top plate 21 is fixed in a watertight state with a rubber packing or a sealing material PK interposed between the opening of the upper frame 20 or the upper surface as shown in FIG. Therefore, water droplets or the like are prevented from entering the inside of the main body A from the upper surface of the top plate 21 through the gap between the upper frame 20 and the top plate 21.

  In FIG. 1, “20 </ b> B” is a right vent hole that is simultaneously punched and formed by a press machine when the upper frame 20 is formed, and serves as an intake passage of a blower 30 described later. “20C” is a central vent hole that is also punched when the upper frame 20 is formed, and “20D” is a left vent hole that is also punched when the upper frame 20 is formed.

  “20E” is a through hole formed in the upper frame 20, as shown in FIG. 8, and this is a right heating power setting operation unit 70, a central operation unit 72, and a left heating power setting operation of the upper surface operation unit 61 described later. This is for passing a plurality of push buttons for operating various switch operation keys of the section 71 (for example, operation switches for starting energization of the heaters 22 and 23 of the grill heating chamber 9). In FIG. 8, only one through hole 20E is drawn for the sake of drawing.

  In an actual cooking stage, the top plate 21 may be heated to 300 ° C. or more by receiving heat from a heated object N such as a pan that has been heated by the right IH coil 6RC and the left IH coil 6LC. Further, when the central heating source 7 which is a radiation type electric heater is provided below the top plate 21, the top plate 21 is directly heated to a high temperature by the heat from the central heating source 7, and the temperature is It may reach 350 degrees or more.

  “123A” is a through hole formed in the front frame 123, which is used for operating various switches of the right heating power setting operation unit 70, the central operation unit 72, and the left heating power setting operation unit 71 of the upper surface operation unit 61 described later. This is for passing a plurality of push buttons 254A for operating a key (for example, an operation switch for starting energization of the heaters 22 and 23 of the grill heating chamber 9) (see FIG. 8). The through hole 123A is formed at a position corresponding to the through hole 20E of the upper frame 20. In FIG. 8, only one through hole 123A is drawn for the sake of drawing.

  On the upper surface of the top plate 20, circular guide marks 6RM, 6LM, and 7M indicating the approximate positions of the right IH coil 6RC, the left IH coil 6LC, and the central heating source 7 as described later as shown in FIGS. Each is displayed by a method such as printing.

(Heating means)
In this embodiment, an electromagnetic induction heating means and a radiant electric heating source are provided as heating means. That is, the upper right side and the left side of the main body part A are provided with a right IH coil 6RC and a left IH coil 6LC which are electromagnetic induction heating means, and a radiant electric heating source near the rear part on the left and right center line of the main body part A. The central heating source 7 is provided with sheathed heaters 22 and 23 which are radiant electric heating sources above and below the grill heating chamber 9. These heating sources are configured such that energization is controlled independently from each other by the control means, and details will be described later with reference to FIG.

(Right IH coil)
The right IH coil 6RC is installed inside the upper part chamber 10 that is partitioned and formed inside the main body case 2. That is, the right IH coil 6RC is disposed on the lower surface side of the right position of the top plate 21. The upper end of the coil is close to the lower surface of the top plate 21 with a minute gap, and serves as an electromagnetic induction heating source. In this embodiment, for example, a device having a maximum power consumption (maximum thermal power) of 3 KW is used. The right IH coil 6RC is spirally bundled with about 30 thin wires of about 0.1 mm, and this bundle (hereinafter referred to as a collecting wire) is wound while one or more strands are twisted so that the outer shape becomes circular. Finally, it is formed into a disk shape. The diameter (maximum outer diameter dimension) of the right IH coil 6RC is about 180 mm.

  The left and right IH heating coils 6LC, 6RC are provided with a high permeability material, for example, a plate or rod made of ferrite, as a magnetic flux leakage prevention material from the coils. In the form, the illustration is omitted. The magnetic flux leakage prevention material does not need to cover the entire lower surfaces of the left and right IH heating coils 6LC and 6RC, and the magnetic flux leakage prevention material formed in a rod shape with a cross section of, for example, a square or a rectangle is set at a predetermined interval so as to intersect the coils. It is sufficient to provide a plurality. Further, a plurality of radials may be provided from the center of each coil.

  The position of the guide mark RM, which is a circle (solid line in FIGS. 1 and 3) displayed on the top plate 21, does not completely coincide with the outermost peripheral position of the right IH coil 6RC. The guide mark indicates a proper induction heating area. A broken circle in FIG. 3 indicates the outermost peripheral position of the right IH coil 6RC.

  The right IH coil 6RC may be divided into a plurality of parts so as to be energized independently. For example, an IH coil is wound in a spiral shape on the inside, and an IH coil wound in another large-diameter spiral shape is placed on the outer peripheral side of the IH coil on a concentric circle and substantially on the same plane. The object to be heated may be heated by three energization patterns of energizing the outer IH coil and energizing both the inner and outer IH coils. By heating at least one of the output level, duty ratio, and output time interval of high-frequency power flowing through the two IH coils in this way, or by combining these, efficient heating from small to large (large diameter) pans is possible. You may make it do. Japanese Patent No. 2978069 is known as a representative technique using a plurality of coils that can be independently energized.

  “31R” is an infrared temperature detection element installed in the center space of the right IH coil 6RC (see FIG. 7). The infrared temperature detection element 31R (hereinafter referred to as a temperature sensor 31R) is configured by a photodiode or the like that can measure the temperature by detecting the amount of infrared rays emitted from a heated object N such as a pan. The temperature detection element may be a heat transfer type detection element, for example, a thermistor type temperature sensor.

  For example, Japanese Patent Application Laid-Open No. 2004-95144 (Japanese Patent No. 3975865) and Japanese Patent Application Laid-Open No. 2006-2006 disclose that infrared rays emitted from an object to be heated according to the temperature thereof are rapidly detected from below the top plate by an infrared sensor. No. 310115 and Japanese Patent Application Laid-Open No. 2007-18787.

  When the temperature sensor 31R is an infrared sensor, it is superior to the thermistor type because it collects the infrared rays emitted from the object to be heated and can detect the temperature from the amount of infrared rays received almost in real time. The infrared sensor can be heated regardless of whether the temperature of the top plate 21 made of heat-resistant glass or ceramics in front of the object to be heated and the temperature of the object to be heated are the same. Temperature can be detected. This is because the infrared rays radiated from the object to be heated are devised so that the top plate 21 does not absorb or block the infrared rays. For example, a material that transmits infrared rays in a wavelength range of 4.0 μm or 2.5 μm or less is selected for the top plate, and a temperature sensor 31R is selected that detects infrared rays in a wavelength range of 4.0 μm or 2.5 μm or less. ing.

  On the other hand, when the temperature sensor 31R is of a heat transfer type such as a thermistor, it is inferior in capturing a rapid temperature change in real time as compared with an infrared sensor, but receives radiant heat from the top plate 21 or the object to be heated, It is possible to reliably detect the temperature of the bottom of the object to be heated and the top plate 21 immediately below the bottom. Even when there is no object to be heated, the temperature of the top plate 21 can be detected. In the case where the temperature sensor 31R is a heat transfer type such as a thermistor, the temperature sensing portion is directly in contact with the lower surface of the top plate 21, or a member such as a heat transfer resin is interposed to place the temperature sensor 31R on the top plate 21 itself. The temperature may be grasped as accurately as possible. This is because if there is an air gap between the temperature sensing unit and the lower surface of the top plate 21, a temperature transmission is delayed.

(Left IH coil)
The left IH coil 6LC is installed at a position contrasting with the right IH coil 6RC across the left and right center line of the main body A, and has the same configuration as the right IH coil 6RC. In this embodiment, for example, a device having a maximum power consumption (maximum thermal power) of 3 KW or 2.5 KW is used. The left IH coil 6LC has a diameter (maximum outer diameter dimension) of about 180 mm when the maximum heating power is 3 KW, and about 170 mm when the maximum heating power is 2.5 KW.

The position of the guide mark 6LM which is a circle (solid line in FIGS. 1 and 3) displayed on the top plate 21 is completely coincident with the outermost peripheral position of the left IH coil 6LC which is the left IH coil 6LC. is not. The guide mark indicates a proper induction heating area. A broken circle in FIG. 3 indicates the outermost peripheral position of the left IH coil 6LC.
Similarly to the right IH coil 6RC, an infrared temperature detection element 31L (hereinafter referred to as a temperature sensor 31L) is installed in the center space (see FIG. 7).

(Radiation type central electric heating source)
The central heating source 7 is arranged on the left and right center line of the top plate 21 inside the main body A and at a position near the rear part of the top plate 21. The central heating source 7 uses an electric heater (for example, a nichrome wire, a halogen heater, or a radiant heater) that is heated by radiation, and heats an object to be heated such as a pan through the top plate 21 from below. And, for example, one having a maximum power consumption (maximum heating power) of 1.2 kW is used.

The central heating source 7 has a circular container shape with the entire upper surface open, and the container-like cover 50 made of heat insulating material constituting the outermost peripheral portion has a maximum outer diameter of about 180 mm and a thickness of 5 mm. It has become.
The position of the guide mark 7M, which is a circle (solid line in FIGS. 1 and 3) displayed on the top plate 21, does not completely coincide with the outermost peripheral position of the central heating source 7. The guide mark indicates a proper induction heating area. A broken circle in FIG. 3 indicates the outermost peripheral position of the central heating source 7.

(Radiation type electric heating source for grill heating room)
“24R” is a vertical partition plate on the right side that is installed vertically, and serves as a partition wall that separates the right cooling chamber 8R and the grill heating chamber 9 from each other inside the main body case 2. “24L” is also the left upper and lower partition plates, and serves as a partition wall that separates the left cooling chamber 8L and the grill heating chamber 9 from each other. Note that the upper and lower partition plates 24R and 24L are installed at an interval of about several millimeters from the outer wall surface of the grill heating chamber 9.

  “25” is a horizontal partition plate, and has a size that divides the entire space between the left and right upper and lower partition plates 24L and 24R into two upper and lower spaces. is there. The horizontal partition plate 25 is installed with a predetermined gap 26 of about several millimeters to 1 cm from the ceiling surface of the grill heating chamber 9.

  “24A” is a notch formed in each of the left and right upper and lower partition plates 24L and 24R, and is provided so as not to collide with a cooling duct 42 to be described later when it is horizontally installed.

  The grill heating chamber 9 formed in the shape of a rectangular box has wall surfaces on the left, right, top, bottom, and back sides made of a metal plate such as stainless steel or steel plate, and the top and bottom 1 near the top ceiling and bottom as a radiant electric heating source. The pair of sheathed heaters 22 and 23 (see FIG. 6) are installed so as to spread substantially horizontally.

These two heaters can be energized simultaneously or individually to perform roast cooking (for example, grilled fish) or grill cooking (for example, pizza or gratin), and oven cooking (for example, by setting the ambient temperature in the grill heating chamber 9) Cakes and baked vegetables). The sheathed heater 22 near the top ceiling is, for example, a maximum power consumption (maximum thermal power) 1200 W, and the sheathed heater 23 near the bottom is, for example, a maximum power consumption 800 W.
“26” is the gap described above and is formed between the horizontal partition plate 25 and the ceiling wall surface of the grill heating chamber 9, and this gap 26 is finally communicated with the exhaust chamber 12. The air is drawn out of the main body A through the exhaust chamber 12 and discharged.

  “28” is a rear partition plate that partitions the upper part chamber 10 and the exhaust chamber 12, and has a lower end portion that reaches the horizontal partition plate 25 and an upper end portion that reaches the upper frame 20. “28A” is an exhaust hole formed in two places on the rear partition plate 28 for exhausting the cooling air that has entered the upper part chamber 10.

  As shown in FIG. 2, the horizontal partition plate 25 is installed so as to cover the entire space between the left and right partition plates 24 </ b> R and 24 </ b> L, but the upper space of the horizontal partition plate 25 is the upper part chamber 10. . As shown in FIG. 5, “58” is a power supply board located at the right back corner of the upper part chamber 10 and partially protruding above the right cooling chamber 8R. A commercial power supply of 100 V or 200 V is drawn from the lower part of the rear surface of No. 2. On this power supply board, for example, various electrical component groups for the bridge circuit 221 that rectifies the commercial power supply are mounted.

  In addition, a power supply board (indicated by “59” in FIG. 9) that partially protrudes above the left cooling chamber 8L is also installed in the left rear corner of the upper component storage chamber 10. The power supply board supplies power to the central heating source 7 and the heaters 22 and 23 of the grill heating chamber 9. Power is supplied from the power supply board 58 and various electric components for heating capacity (thermal power) control are mounted. Has been. These two power supply boards 58 and 59 are attached to the horizontal partition plate 25 with fixing means such as screws so as to maintain a certain gap 119 from the upper surface of the horizontal partition plate 25. The gap 119 is for facilitating passage of cooling air from a cooling unit CU described later.

(Cooling fan)
The blower 30 uses a centrifugal multi-blade blower (for example, a sirocco fan), and uses a blade 30 </ b> F fixed to the tip of the rotating shaft 32 of the drive motor 300. The blower 30 is installed in each of the right cooling chamber 8R and the left cooling chamber 8L, and cools the circuit boards for the left and right IH coils 6LC and 6RC and the coils themselves.

  When a centrifugal blower is used, the discharge capacity (discharge capacity) is not uniform over the entire discharge port, and there is the highest part of the discharge capacity, but this part is specified for the circuit boards for the left and right IH coils 6LC and 6RC. When placed in a part, that particular part is cooled by the strongest wind. However, if the air from the indoor space of the kitchen or the like contains oily smoke or dust, it should be noted that it is more likely to adhere to and accumulate on the surface of the component on a specific part of the circuit board. It is. This is because, over many years of use, oil deposits accumulate on the circuit board, which leads to a decrease in electrical insulation of the circuit board by absorbing moisture.

The blower 30 is a so-called horizontal shaft type in which the rotation shaft 32 of the drive motor is horizontal, and is accommodated in a fan case 37 installed in the right cooling chamber 8R.
A circular air space is formed inside the fan case 37 so as to surround a large number of rotary blades 30F of the air blower 30, and an air blowing chamber 39 is formed. 37A is a suction cylinder of the fan case 37, and a suction port 37B is formed at the uppermost position. Reference numeral 37 </ b> C denotes a blowout port formed at one end of the fan case 37.

  The fan case 37 is formed as an integral structure by, for example, combining two plastic cases 37D and 37E and connecting them with a fixture such as a screw. In this coupled state, it is inserted into the cooling spaces 8R and 8L from above and fixed so as not to move by an appropriate fixing means.

  “34” is a component case connected in close contact with the fan case 37 so that the cooling air discharged from the outlet 37C of the fan case 37 is introduced, and has a horizontally long rectangular shape as a whole. Then, the entire other part except the introduction part (not shown) communicating with the outlet 37C, the first exhaust port 34A and the second exhaust port 34B, which will be described later, is hermetically sealed. . The component case 34 accommodates a circuit board 41 constituting an inverter circuit for driving an IH coil.

The circuit board 41 is a printed wiring board (hereinafter referred to as a circuit board) on which an inverter circuit that supplies predetermined high-frequency power to the right IH coil 6RC and the left IH coil 6LC is mounted. It has comparable external dimensions, and is installed on the side far from the grill heating chamber 9 in the part case 34, that is, on the side approaching to the vicinity of only a few millimeters or less in the main body case 2 constituting the outline of the main body A. Yes. A power supply / drive circuit 33 for driving the drive motor 300 of the blower 30 is mounted on the circuit board 41 apart from the inverter circuit portion.
The inverter circuits 210R and 210L referred to in the circuit board 41 are the DC side outputs except for the rectifier bridge circuit 221 whose input side is connected to the bus of the commercial power source shown in FIG. A DC circuit composed of a coil 222 and a smoothing capacitor 223 connected to the terminals, a coil 222, a resonance capacitor 224, an IGBT 225 which is a power control semiconductor serving as a switching means, a drive circuit 228, a smoothing capacitor 223, The flywheel diode 226 is not included in the IH coils 6RC and 6LC.

  On the upper surface of the component case 34, two first exhaust ports 34 </ b> A and two second exhaust ports 34 </ b> B are formed along the direction in which the cooling air from the blower 30 flows. The second exhaust port 34B is located at the most downstream position of the cooling air flow in the component case 34, and has a larger opening area (opening area several times larger) than the first exhaust port 34A. Yes. 5, Y1 to Y5 indicate the flow of air sucked by the blower 30 and the flow of discharged air, and the cooling air flows in sequence with Y1, Y2,... Y5.

  The component case 34 and the fan case 37 constitute a so-called cooling unit CU, and the cooling unit CU is inserted and fixed in the cooling chambers 8R and 8L from above.

  “42” is a cooling duct formed of plastic, for example, and an upper case 42A, which is an integrally molded product of plastic, and a lower case 42B, which is also an integrally molded product of plastic, are stacked and fixed with screws. Three ventilation spaces 42F, 42G, and 42H, which will be described later, are formed in the interior. One side edge of the cooling duct 42 on the part case 34 side is a square, and the remaining outer periphery is a circle.

  “42CA” is plural (for example, seven) on the rear portion of the upper surface of the upper case 42A, and plural (for example, three) on the back side of the upper case 42A constituting the peripheral wall surface of the ventilation space 42F; this is visible in FIG. Each of the first blowout holes formed is in a non-existing position. The first ejection holes 42CA are formed to supply the cooling air from the blower 30 mainly directly behind and obliquely behind the cooling duct 42, that is, in the direction of the power supply boards 58 and 59 and the central heating source 7. The diameter of each ejection hole 42CA is the same, for example, a perfect circle with a diameter of 8 mm.

  “42CB” is a plurality of second ejection holes formed so as to penetrate the wall surface over the entire upper surface of the upper case 42A. The second ejection hole 42CB is formed to supply cooling air from the blower 30 mainly upward, that is, in the direction of the IH coils 6RC and 6LC. Note that the diameters of the respective ejection holes 42CB are the same, for example, a perfect circle having a diameter of 10 mm.

  “42D” is a rib (projection) -shaped partition wall integrally formed in the upper case 42A so as to form a straight line or a curved line. As a result, a ventilation space 42F having one end communicating with the exhaust port 34A of the component case 34 is formed. A compartment is formed.

  Similarly, “42E” is a partition wall having a U-shaped ridge shape, which is integrally formed in the upper case 42A, thereby defining a ventilation space 42H having one end communicating with the exhaust port 34B of the component case 34. It is formed. The ventilation space 42H communicates with the widest ventilation space 42G through a communication port 42J formed on one side of the partition wall (see FIG. 5).

  Further, the cooling duct 42 is installed so that one side of the ventilation space 42H (the side close to the component case 34 in FIG. 4) is directly above the second exhaust port 34B of the component case 34. Thus, the cooling air discharged from the component case 34 enters the ventilation space 42H of the cooling duct 42, expands from here to the ventilation space 42G, and is ejected from the second ejection hole 42CB. Incidentally, “42K” is a rectangular ventilation opening formed corresponding to the ventilation space 42H of the upper case 42A, and this emits air for cooling liquid crystal display screens 45R and 45L described later.

  A part (for example, two) of the three first ejection holes 42CA formed on the back side of the upper case 42A is opposed to the power supply board 58 or the power supply board 59, and the remaining part (for example, one) is It is formed so as to face the right or left side position of the central heating source 7, and fresh cooling air sent from the first exhaust port 34A of the cooling unit CU to the ventilation space 42F is directed to the power supply board 58 and the power supply board 59. And for spraying toward the side of the central heating source 7.

  “43A” and “43B” are power control semiconductor switching elements such as IGBT 225 in the circuit board 41 on which the inverter circuits 210R and 210L for the right IH coil 6RC and the left IH coil 6LC are mounted. It is an aluminum radiating fin with parts attached. The radiating fins 43A and 43B are formed by regularly arranging a large number of thin fins. As shown in FIG. 5, the radiating fins 43A and 43B are installed on the side close to the ceiling portion in the component case 34, and a sufficient space is secured below the component case 34 so that the cooling air is passed through the space. Y4 flows. That is, due to the characteristics of the blower 30, the discharge capacity is not uniform over the entire area of the outlet 37 </ b> C, and the highest part of the discharge capacity is below the vertical center point of the outlet 37 </ b> C, but does not become a position on the extension line of this position. Thus, the positions of the radiation fins 43A and 43B are set upward. This prevents the cooling air from being blown directly toward various small electronic components and printed wiring pattern portions mounted on the surface of the circuit board 41.

  The grill heating chamber 9 is formed and built below the IH coils 6RC and 6LC in the main body case 2, and a predetermined space SX (see FIGS. 4 and 6) between the inner rear wall surface of the main body case 2. ) Is provided. That is, a space SX of 10 cm or more is formed between the grill heating chamber 9 and the trunk rear wall 2U of the main body case 2 in order to install an exhaust duct 14 to be described later and to form the exhaust chamber 12.

  In a state where two independent cooling units CU are inserted and fixed in the cooling chambers 8R and 8L from above, a part of the fan case 37 having a large lateral width partially protrudes into the space SX and accommodates the circuit board 41 The case 34 is formed with a predetermined gap from the left and right side wall surfaces of the grill heating chamber 9. In addition, the space | gap here means the space | gap between the left and right outer wall surfaces of the grill heating chamber 9, and means the opposing gap between the left and right partition plates 24 and 24L and the outer surface of the component case 34. It is not a thing.

  Thus, the fan case 37 portion of the cooling unit CU is disposed in the space SX portion even if the grill heating chamber 9 is present, and when viewed from the front, the fan case 37 portion of the cooling unit CU is By partially overlapping the grill heating chamber 9, it is possible to prevent an increase in the width dimension of the main body A.

(Operating means)
The operation means of the cooking device according to this embodiment includes a front operation unit 60 and an upper operation unit 61.
(Front operation unit)
Plastic front operation frames 62R and 62L are attached to the left and right front surfaces of the main body case 2, and the front surface of the operation frame is a front operation unit 60. The front operation unit 60 includes a main power switch 63 (see FIG. 2) for turning on / off all the power of the left IH coil 6LC, the right IH coil 6RC, the central heating source 7, and the sheathed heaters 22 and 23 all at once. The operation button 63A, the right operation dial 64R for opening and closing the electrical contact of the right power switch for controlling the energization of the right IH coil 6RC and the energization amount (thermal power), and the energization of the left IH coil 6LC and the energization amount (thermal power). And a left operation dial 64L of a left control switch for controlling the control.

  The front operation unit 60 is energized to the left IH coil 6RC by the left operation dial 64L and the left indicator lamp 66L that is lit only when the left IH coil 6LC is energized by the left operation dial 64L. A right indicator lamp 66R that is lit only in the state is provided.

  When the left operation dial 64L and the right operation dial 64R are not used, they are pushed inward so as not to protrude from the front surface of the front operation unit 60 as shown in FIG. When the user presses the finger once and then releases it, it protrudes by the force of a spring (not shown) built in the front operation frame 62 (see FIG. 2), so that the user can grab and turn around. Yes. Then, if the stage is turned to the right or left by one step, energization (with a minimum setting heating power of 120 W) is started for the left IH coil 6LC or the right IH coil 6RC for the first time.

  Furthermore, if either the protruding left operation dial 64L or right operation dial 64R is turned in the same direction, a predetermined electrical pulse generated from a built-in rotary encoder (not shown) is generated according to the amount of rotation. The control means reads, the energization amount of the heating source is determined, and the heating power can be set. Note that the left operation dial 64L and the right operation dial 64R are both in an initial state or are turned to the left and right in the middle, and the user presses once with a finger from the front surface of the front operation unit 10. When pushed into a predetermined position that does not protrude, both the left IH coil 6LC and the right IH coil 6RC can be de-energized. That is, even during cooking, if the right operation dial 64R is pushed in, the right IH coil 6R is immediately turned off.

  If the operation button 63A of the main power switch 63 (see FIG. 1) is turned off, then the operations of the right operation dial 64R and the left operation dial 64L are invalidated simultaneously. Similarly, the energization of the central heating source 7 and the built-in heaters 22 and 23 of the grill heating chamber 9 are all cut off.

  Although not shown, three independent timer dials (not shown) are provided at the front lower portion of the front operation frame 62. These timer dials energize the left IH coil 6LC, the right IH coil 6RC, and the central heating source 7 for a desired time (timer set time) from the start of energization, and automatically turn off the power after the set time has elapsed. This is for operating a timer switch (also called a timer counter).

(Top operation section)
The upper surface operation unit 61 includes a right heating power setting operation unit 70, a left heating power setting operation unit 71, and a central operation unit 72.
An upper surface operation unit 61 is disposed on the upper surface of the top plate 21, specifically, on the front portion of the upper frame 20. A right heating power setting operation unit 70 of the right IH coil 6RC is installed on the right side of the center line A (CL in FIG. 3), and the central heating source 7 and the grill heating chamber 9 are installed in the center. In addition, the central operation unit 72 of the electric heaters 22 and 23 is disposed on the left side, and the left heating power setting operation unit 71 of the left IH coil 6LC is disposed on the left side.

(Right or left heating power setting operation unit)
In FIG. 3, the right heating power setting operation unit 70 is provided with a one-touch setting key unit for each heating power that can easily set the heating power of the right heating source 6RC only by pressing once by the user. . For example, it has three one-touch keys, a low thermal power key, a medium thermal power key, and a strong thermal power key. The low thermal power key sets the thermal power of the right heating source 6RC to 300 W, the medium thermal power key 26 sets to 750 W, The strong firepower key is set to 2.5 kW. Furthermore, a strong heating power key is provided at the right end portion of the right one-touch key portion, and when it is desired to set the heating power of the right heating source 6RC to 3 KW, this is pressed.

  Similarly, the left heating power setting operation unit 71 for setting the heating power of the left IH coil 6LC is also provided with a one-touch key group similar to the right heating power setting operation unit 70.

(Central control unit)
As shown in FIG. 3, an operation button (not shown) of an operation switch (not shown) for starting energization of the heaters 22 and 23 of the grill heating chamber 9 used for grill (roast) cooking and oven cooking is provided on the central operation unit 72. And operation buttons of operation switches (not shown) for stopping the energization are provided side by side.
Further, the central operation unit 72 has an operation of a temperature adjustment switch for setting the control temperature in the grill cooking by the heaters 22 and 23 and the electromagnetic cooking by the left IH coil 6LC and the right IH coil 6RC one by one in an additive or subtractive manner. Buttons are provided in a horizontal row. A power switch for turning on / off the central heating source 7 is also provided here. These switches are not shown.

  Further, the central operation unit 72 is provided with a convenient menu key (not shown). When it is operated, deep-fried food cooking (using left IH coil 6LC and right IH coil 6RC), fried food preheating status display (using left IH coil 6LC and right IH coil 6RC, heating oil to a predetermined preheating temperature), timer cooking When setting the left IH coil 6LC, the right IH coil 6RC, the central heating source 7, and the heaters 22 and 23 provided in the grill heating chamber 9 by energizing them for the time set by the timer switch. If pressed, a desired input screen or status display screen can be easily read out to the integrated display device 100 described later.

  When a start switch for operating / starting the above-described timer counter (not shown) is operated, the elapsed time from the start time is measured and displayed on the liquid crystal display screens 45R and 45L. The display light of the liquid crystal display screens 45R and 45L is transmitted through the top plate 21, and the elapsed time is clearly displayed to the user in units of “minutes” and “seconds”.

(Thermal power indicator lamp)
On the right front side of the top plate 21, a right heating power display lamp 101R that displays the magnitude of the heating power of the right IH coil 6RC is provided at a position between the right IH coil 6RC and the right heating power setting operation unit 70. The right thermal power display lamp 101R is provided in the vicinity of the lower surface of the top plate 21 so as to transmit the top plate 21 and emit display light from the lower surface to the upper surface side.
Similarly, a left heating power display lamp 101L that displays the magnitude of the heating power of the left IH coil 6LC is provided at a position between the left IH coil 6LC and the left heating power setting operation unit 22 on the left front side of the top plate 21. The top plate 21 is provided in the vicinity of the lower surface of the top plate 21 so as to transmit light and emit display light from the lower surface to the upper surface side.

(Display device)
An integrated display device 100 is provided at the center in the left-right direction of the top plate 21 and on the front side in the front-rear direction. This integrated display device 100 is mainly composed of a liquid crystal panel, and is provided in the vicinity of the lower surface of the top plate 21 so as to transmit the top plate 21 and emit display light from its lower surface to the upper surface side.

The integrated display device 100 inputs or confirms the energization state (thermal power, time, etc.) of the left IH coil 6LC, the right IH coil 6RC, the central heating source 7 and the heaters 22 and 23 of the grill heating chamber 9 and the like. Can do. That is,
(1) Functions of left and right IH coils 6L and 6R (whether cooking operation is being performed, etc.)
(2) Function of central heating source 7 (whether cooking is in progress, etc.)
(3) In the case of cooking in the grill heating chamber 9, operating procedures and functions for performing the cooking (for example, whether roaster, grill, or oven cooking is currently being performed)
Corresponding to each of the above, heating conditions such as operating conditions and thermal power are clearly displayed by characters, illustrations, graphs and the like.

  The liquid crystal screen used in the integrated display device 100 is a known dot matrix type liquid crystal screen. In addition, a high-definition screen (QVGA with a resolution of 320 × 240 pixels or 640 × 480 dots, equivalent to VGA capable of displaying 16 colors) can be realized, and a large number of characters can be displayed even when characters are displayed. Can do. The liquid crystal screen is not limited to a single layer, but may be one that displays in two or more layers in order to increase display information. The size of the display area of the liquid crystal screen is a rectangle having a length (front-rear direction) of about 4 cm and a width of about 10 cm.

The screen area for displaying information may be divided into a plurality of heating sources. For example, the screen may be assigned to a total of 10 areas and defined as follows.
(1) Corresponding area of left IH coil 6LC (one each for thermal power and time)
(2) Corresponding area of central heating source 7 (one each for thermal power and time)
(3) Corresponding area for right IH coil 6RC (one each for thermal power and time)
(4) For cooking in the grill heating chamber 9 (one each for heating power and time)
(5) One guide area for displaying reference information for various types of cooking as needed or by user operation
(6) A display area (1) for notifying the user when abnormal driving is detected or improper operation is used.

  The total of 10 areas (display areas) described above are realized on the liquid crystal screen of the integrated display device 100, but are not physically individually formed or partitioned on the screen itself. . That is, since it is established by screen display software (microcomputer program), the area, shape, and position can be changed each time by the software. In consideration of the user's convenience, the left IH coil 6LC, the central heating source 7, the right IH coil 6RC and the like are always arranged in the same order in accordance with the left and right order. That is, on the screen, information about the left IH coil 6LC on the left side, the center heating source 7 in the middle, and information on the right IH coil 6RC on the right side are displayed.

  In addition, when the correspondence area of the left and right IH coils 6LC and 6RC is two, the first display area for displaying the normal state of the “first condition” setting such as the thermal power (heating amount), the cooking time, the set temperature, etc. (There are more types than the first condition) and the second display area for displaying the setting state of the “second condition” and the “physical quantity such as temperature, current, voltage, etc.” abnormal state specific to the heating source It may be divided into two areas.

(Grill heating chamber 9)
The front opening 9A of the grill heating chamber 9 is covered by a door 13 so as to be opened and closed, and the door 13 is held in the heating chamber 9 by a support mechanism so as to be movable in the front-rear direction. Further, a window plate made of heat-resistant glass is installed in the central opening 13A of the door 13 so that the inside of the grill heating chamber 9 can be visually recognized from the outside. The door 13 can be opened and closed by a handle 13B protruding forward. As described above, the grill heating chamber 9 is formed with a predetermined space SX between the inner rear wall surface of the main body, an exhaust duct 14 to be described later is installed using this space, and an exhaust chamber 12 is formed. Has been.

  A front end portion of a metal tray 108 is connected to the door 13, and when the door 13 is pulled forward, the tray 108 is also pulled out to the front of the grill heating chamber 9 along with the pulling operation. A metal grill 109 may be placed on the tray 108 for use. Since the receiving tray 108 is detachably supported on both left and right metal rails DL connected to the door 13, the receiving tray 108 can be detached from the rail DL independently. ing.

  Further, the shape of the grill 109 and the position and shape of the tray 108 are devised so that they cannot be pulled out by hitting the lower heater 23 when the tray 108 is pulled forward. In this manner, in the grill heating chamber 9, if meat, fish, or other food is placed on the grill 109 and the heaters 22 and 23 are energized (simultaneously or in time division or the like), the food is heated from both the upper and lower surfaces. It has a “double-sided baking function”. The grill heating chamber 9 is provided with a temperature sensor (not shown) for detecting the room temperature, and cooking can be performed while maintaining the interior temperature at a desired temperature.

  As shown in FIG. 6, the grill heating chamber 9 has a cylindrical metal inner frame 9 </ b> C having an opening 9 </ b> B on the rear (back) side and an opening 9 </ b> A on the front side, and the entire outside of the inner frame 9 </ b> C. The outer frame 9D covers a predetermined (lower) gap 113, an (upper) gap 114, and left and right side gaps (not shown). In addition, “307” is a gap formed between the outer frame 9D of the grill heating chamber 9 and the bottom wall surface of the main body case 2.

  The outer frame 9D has five surfaces, that is, left and right side wall surfaces, an upper surface, a bottom surface, and a back surface, and is entirely formed of a steel plate or the like. The inner surfaces of the inner frame 9C and the outer frame 9D are formed with a coating with good cleanability such as enamel, a heat-resistant coating film, or an infrared radiation film. If an infrared radiation film is formed, the amount of infrared radiation with respect to an object to be heated such as food is increased, heating efficiency is increased, and uneven burning is also improved.

“9E” is an exhaust port formed in the upper part of the back wall surface of the outer frame 9D. “14” is a metal exhaust duct installed so as to be continuous with the outside of the exhaust port 9E. As shown in FIG. 6, the exhaust duct 14 has a square or rectangular channel cross section, and is inclined obliquely upward as it goes from the middle to the downstream side, then bends in the vertical direction, and finally the upper end opening 14A has an upper frame. 20 is communicated to the vicinity of the central ventilation opening 20C formed in 20.
"120" is a deodorizing catalyst installed in the exhaust duct 14 at a position downstream of the exhaust port 9E. The catalyst 120 is activated by being heated by the catalyst heater 121 and the like, and the inside of the grill heating chamber 9 passing through the exhaust duct 14 It works to remove odorous components from the hot air.

(Exhaust structure / intake structure)
As shown in FIG. 1, a horizontally elongated right vent (becomes an intake port) 20B, a central vent (becomes an exhaust port) 20C, and a left vent (becomes an intake port) 20D are formed at the rear of the upper frame 20, respectively. Has been. On these three rear vents, a metal plate-like cover 130 in which countless small communication holes are formed so as to cover the entire upper part is detachably mounted. The cover 130 may be a metal mesh or a fine lattice shape in addition to a metal plate formed with small holes for communication holes by press working (also referred to as punching metal). In any case, it is only necessary that the user's finger or a foreign object does not enter the ventilation openings 20B, 20C, 20D from above.

  The suction port 37B at the top of the suction cylinder 37A of the fan case 37 faces directly below the left and right ends of the cover 130, and external room air such as a kitchen is passed through the communication hole of the cover 130 in the left and right sides of the main body A. The cooling chambers 8R and 8L can be introduced.

In the exhaust chamber 12 formed in the rear part, as shown in FIG. 2, the upper end part of the exhaust duct 14 is located. In other words, the exhaust chamber 12 communicating with the gap 116 formed around the grill heating chamber 9 is secured on the left and right sides of the exhaust duct 14. The grill heating chamber 9 is installed with a predetermined gap 116 between it and the horizontal partition plate 25, and this gap 116 finally communicates with the exhaust chamber 12.
As described above, since the interior of the upper part chamber 10 communicates with the exhaust chamber 12 through the pair of exhaust ports 28A formed in the rear partition plate 28, the cooling air flowing in the upper part chamber 10 (see FIG. 5). The arrow Y5) is discharged to the outside of the main part A as indicated by the arrow Y6 in FIG. At this time, it is attracted by this, and the air inside the gap 116 is also discharged together.

As shown in FIG. 7, a circuit board 41 on which an inverter circuit or the like is formed includes a rectifier bridge circuit 221 connected to a commercial power supply of 100 V or 200 V, and a coil 222 connected to a DC side output terminal of the rectifier bridge circuit 221. , A smoothing capacitor 223, a resonance capacitor 224 connected to these coils and capacitors, a power control element 225 serving as a semiconductor switching means (IGBT or the like) connected to these components, and other electric / electrical power necessary for induction heating drive. Electronic circuit components are mounted.
Further, the power control element 225 generates heat because a large amount of electric power flows in accordance with the induction heating drive operation. Therefore, in order to cool this, the power control element 225 is attached to the heat radiation fin 43A by heat transfer and cooled by the cooling air from the blower 30. I am doing so. In the case of an inverter circuit having a plurality of power control elements 225, the inverter circuit is also attached to the other radiating fin 43B by heat transfer.

(Auxiliary cooling structure)
In FIG. 4, “46” denotes a front part in which various electric / electronic parts of the upper surface operation unit 61 and a light emitting element 57 or the like for displaying the heating power during induction cooking by light are fixedly accommodated on the substrate 56. The case is composed of a transparent plastic lower duct 46A having an open upper surface and a transparent plastic upper duct 46B that serves as a lid for closing the upper surface opening of the lower duct.

  Ventilation holes 46R and 46L are opened at the right end and the left end of the lower duct 46A, respectively, and a notch 46C that allows ventilation is formed at the rear of the center. “46H” is a leg portion formed integrally with the lower surface of the lower duct 46A, and has a function of supporting the lower duct 46A on the upper surface of the horizontal partition plate 25. The leg portion 46H may be formed long and continuously on the lower surface of the lower duct 46A, and may also be used as a cooling air guide plate. In this embodiment, however, the leg portion 46H is interposed between the lower duct 46A and the horizontal partition plate 25. Since the cooling air does not actively flow, there are only a few points of the leg portions 46H.

On the ceiling surface of the upper duct 46B, the integrated display device 100 is installed in the center, and the liquid crystal display units 45R and 45L are installed on the left and right, respectively. Cooling air from the blower 30 enters the ventilation space 42H of the cooling duct 42 from the second exhaust port 34B of the component case 34, and from there through the ventilation ports 42K formed corresponding to the ventilation space 42H, the liquid crystal display units 45R and 45L. It enters the front part case 46 from below and is discharged from the notch 46C to the upper part chamber 10. Thus, the liquid crystal display units 45R and 45L and the integrated display device 100 are always cooled by the cooling air from the blower 30. In particular, since the cooling air from the second exhaust port 34B of the component case 34 is not the air that has cooled the left and right IH coils 6LC and 6RC that become high during the induction heating operation, the temperature is low, and the liquid crystal display units 45R and 45L and the integrated air are integrated. With the display device 100, the temperature rise is effectively suppressed while the amount of cooling air is small.
In this embodiment, since the rear position of the left and right IH coils 6LC and 6RC on the downstream side is difficult to cool due to the flow of cooling air indicated by the arrow Y5 in FIG. 5, in this embodiment, the first exhaust port 34A is provided in the ventilation space 42F. A low temperature wind is directly supplied to cool the part.

(Auxiliary exhaust structure)
As shown in FIG. 6, the exhaust duct 14 is formed with a cylindrical bottom portion 14 </ b> B having a shape recessed downward by one step on the downstream side of the deodorizing catalyst 120. “14C” is a vent formed in the bottom 14B. “106” is an axial exhaust fan for auxiliary exhaust facing this vent hole 14C, “106A” is the rotor blade, “106B” is a driving motor for rotating the rotor blade, and the exhaust duct 14 It is supported by.
During cooking in the grill heating chamber 9, the heating chamber 9 becomes hot, so the internal atmospheric pressure naturally rises, and accordingly, the high-temperature atmosphere is discharged and the exhaust duct 14 is raised, but the blower 106 is operated. Then, by taking the air inside the main body A into the exhaust duct 14 as shown by the arrow Y7, the hot air in the grill heating chamber 9 is attracted to the fresh air, and the upper end of the exhaust duct 14 is lowered while the temperature is lowered. The air is exhausted from the opening 14A as indicated by an arrow Y8.

The auxiliary exhaust axial flow fan 106 is not always operated during operation of the cooking apparatus, but is operated when cooking is performed in the grill heating chamber 9. This is because hot air is discharged from the grill heating chamber 9 to the exhaust duct 14 in this case.
Note that the airflows Y7 and Y8 in FIG. 6 and the airflows Y1 to Y5 in FIG. 5 are not related at all and are not continuous.

(Drive circuit)
FIG. 7 is a block diagram showing the entire drive circuit of the cooking device, which is formed around an energization control circuit 200 incorporating one or more microcomputers. The energization control circuit 200 includes four parts: an input unit 201, an output unit 202, a storage unit 203, and a CPU (arithmetic control unit) 204, and a DC power source is connected via a constant voltage circuit (not shown). Supplied and serves as the central control means to control all heating sources and display devices.
In FIG. 7, an inverter circuit 210R for the right IH coil 6RC is connected to a commercial power supply having a voltage of 100V or 200V via a rectifier circuit (also referred to as a rectifier bridge circuit) 221. In addition, an inverter circuit 210L for the left IH coil 6LC is connected to a commercial power supply via a rectifier bridge 221 in parallel with the inverter circuit 210R of the right addition IH coil.

  “211” is a heater driving circuit for the central heating source 7, “212” is a heater driving circuit for driving the internal heating heater 22 of the grill heating chamber 9, and “213” is an internal heating heater for the grill heating chamber 9. 23 is a heater drive circuit that drives the heater 23, “214” is a heater drive circuit that drives the catalyst heater 121 provided in the middle of the exhaust duct 14, and “215” is a drive circuit that drives the liquid crystal screen of the integrated display device 100.

  The inverter circuit 210R of the right IH coil 6RC includes a right IH coil 6RC shown in FIG. 7, a rectifier bridge circuit 221 whose input side is connected to the bus of the commercial power supply, a coil 222 connected to the DC side output terminal, and a smoothing circuit. DC circuit composed of a capacitor 223, a resonance circuit composed of a parallel circuit of an IH coil 6RC and a resonance capacitor 224, one end of which is connected to a connection point between the coil 222 and the capacitor 223, and a collector connected to the other end of the resonance circuit An IGBT 225 serving as a switching means.

  The emitter of the IGBT 225 is connected to a common connection point between the smoothing capacitor 223 and the rectifying bridge circuit 221. The flywheel diode 226 is connected between the emitter and collector of the IGBT 225 so that the anode is on the emitter side.

“227” is a current detection sensor 227 that detects a current flowing through a resonance circuit including a parallel circuit of the right IH coil 6RC and the resonance capacitor 224R. The detection output of the current detection sensor 227 is supplied to the input part of the energization control circuit 200, and when a pot or the like inappropriate for induction heating is used, or when a certain current is exceeded by comparison with the normal current value due to some accident, etc. When a difference undercurrent or overcurrent is detected, the energization control circuit 200 controls the IGBT 225 via the drive circuit 228, and the energization of the right IH coil 6RC is instantaneously stopped.
Note that the inverter circuit 210L of the left IH coil 6L has a circuit configuration equivalent to that of the inverter circuit 210R, and a description thereof will be omitted.

  The current detection sensor 227 is similarly provided in the inverter circuit 210L of the left IH coil 6LC. The current detection sensor 227 includes a shunt that measures current using a resistor and a method that uses a current transformer.

In a cooking apparatus that heats an object N to be heated by such an induction heating method, a power circuit for flowing high-frequency power through the IH coils 6RC and 6LC is called a so-called resonance inverter.
A switching circuit element (IGBT 225 in FIG. 7) is about 20 to 40 KHz to a circuit in which the inductance of the IH coils 6RC and 6LC including the heated object N (metal object) and the resonance capacitor (224 in FIG. 7) are connected. In this configuration, on / off control is performed at the drive frequency.
The resonance type inverter includes a current resonance type which is said to be suitable for a 200 V power supply and a voltage resonance type which is said to be suitable for a 100 V power supply. The configuration of such a resonant inverter circuit is divided into a so-called half-bridge circuit and a full-bridge circuit depending on how the connection destination of the IH coils 6RC and 6LC and the resonant capacitor 224 is switched by a relay circuit. . The inverter circuits 210R and 210L of the present embodiment may be configured with either a half bridge circuit or a full bridge circuit.

As described above, when the object to be heated N (metal object) is induction-heated by energization of the IH coils 6RC and 6LC, in the case of the object to be heated N of a magnetic material such as iron, switching to a circuit connected to a resonance capacitor is performed. The circuit element may be turned on / off at a driving frequency of about 20 to 40 KHz, and a current of about 20 to 40 KHz may be supplied.
On the other hand, when the object to be heated N is made of a material having a high electric conductivity such as aluminum or copper, a large current is passed through the IH coils 6RC and 6LC to obtain a desired heating output. It is necessary to induce a large current in For this reason, in the case of an object to be heated N made of a material having a high electrical conductivity, on / off control is performed at a driving frequency of 60 to 70 KHz.

  “33” is a power source / drive circuit for the motor 31 of the blower 30 for keeping the internal space of the main body A in a certain temperature range, and “231” is a drive of the motor 106B of the auxiliary exhaust fan 106 installed in the exhaust duct 14. Circuit.

(Temperature detection circuit)
In FIG. 7, “240” is a temperature detection circuit, to which temperature detection information from the following temperature detection elements is input.
(1) Temperature detection element 31R provided at the center of the right IH heating coil 6RC
(2) Temperature detection element 31L provided at the center of the left IH heating coil 6LC
(3) Temperature detection element 241 provided in the vicinity of the electric heater of the central heating source 7
(4) Temperature detecting element 242 for detecting the internal temperature of the grill heating chamber 9
(5) Temperature detection element (not shown) installed in the vicinity of the integrated display device 100
(6) Temperature detecting elements 244 and 245 which are attached in close contact with the two radiating fins 43A and 43B inside the component case 34 and detect the temperatures of the two radiating fins individually.

  Two or more temperature detection elements may be provided for one temperature detection object. For example, the temperature sensor 31R of the right heating source 6R may be provided in the central portion and the outer peripheral portion of the IH heating coil 6RC to achieve more accurate temperature control. Further, the temperature detection element may be configured by using a different principle. For example, the temperature detecting element at the center of the IH heating coil 6RC may be an infrared type, and the one provided at the outer peripheral part may be a thermistor type.

  The drive circuit 33 of the motor 300 of the cooling blower 30 always operates the blower 30 to perform cooling in accordance with the temperature measurement status from the temperature detection circuit 240 so that each temperature measurement portion does not become higher than a predetermined temperature.

(Top operation structure)
As shown in FIG. 8, the upper surface operation portion 61 is located above the flange 2T of the front flange plate 2B made of a metal plate that is fixed to the front end portion of the upper surface opening 2A of the main body case 2. The upper surface operation unit 61 includes a resin substrate case 250, a substrate 253 on which a large number of pressing operation switches 251 and electronic component elements 252 attached to the upper surface of the substrate case 250 are mounted, and a switch A push button case 254 having a push button 254A, and a membrane sheet 255 having an outer peripheral edge adhered to the front frame 123 so as to cover the upper portion of the push button case; have.

  The push button case 254 is attached to the frame of the substrate case 250 so as to cover the substrate 253. The membrane sheet 255 is a highly elastic push button support piece, whereby the push button case 254 supports the push button 254A. That is, when the push button 254A is pushed down by the user, the push button 254A is moved downward by a predetermined dimension of about 1 to several millimeters to close the push operation type switch 251, and the push button 254A is pushed from that state. When the button is stopped, the push button support piece returns to its original upper position due to its elasticity, and the push-type switch 251 is opened.

A pair of left and right support pieces 256R and 256L projecting rearward are integrally formed on the vertical wall portion of the front flange plate 2B.
The substrate case 250 is formed long in the horizontal width direction of the top plate 21, and a flat plate-like hanging portion 259 is integrally formed along the rear edge of the substrate case. The hanging portion is inserted between the support pieces 256R and 256L and supported so as to be movable up and down.

  “257” is a bar-shaped elastic body having a square cross section interposed between the lower surface of the substrate case 250 and the upper surface of the flange 2T of the front flange plate 2B, and is formed of, for example, a silicon rubber material. The elastic body 257 may be provided in such a length as to cover the entire width of the lower surface of the substrate case 250, or may be provided only at the left and right ends of the lower surface of the substrate case 250, or may be scattered at predetermined intervals. It is good also as a structure provided more than the location.

  As shown in FIG. 8, the elastic body 257 does not push the push button 254A abnormally beyond a predetermined allowable dimension with respect to the pressing force from below when the front side of the cooking device hits the kitchen furniture KT. Has a repulsive force. That is, when the front side of the cooking device hits the kitchen furniture KT and the flange 2T of the front flange plate 2B is bent upward, the bending is absorbed by the elastic body 257 and further absorbed by the substrate case 250 supported so as to be movable up and down. Is done.

(Operation of cooking device)
Next, the outline | summary of operation | movement of the heat cooking apparatus which consists of said structure is demonstrated. The storage unit 203 in the energization control circuit 200 stores a basic operation program from turning on the power to starting cooking preparation. In order to start the operation, first, the power plug is connected to a commercial power source of 200 V, and the operation button 63A (see FIG. 2) of the main power switch 63 is pressed to turn on the power.

  Then, a predetermined low power supply voltage is supplied to the energization control circuit 200 via a constant voltage circuit (not shown), and the energization control circuit 200 is activated. A self-diagnosis is performed by the control program of the energization control circuit 200 itself, and if there is no abnormality, the motor drive circuit 33 for driving the drive motor 300 of the cooling fan 30 is preliminarily driven.

  Further, the left IH coil 6LC, the right additional IH coil 6RC, and the drive circuit 215 of the liquid crystal display unit of the integrated display device 100 are also preliminarily activated.

The temperature detection circuit 240 reads temperature data from each of the temperature sensors 31R, 31L, 241, 242, 244, 245 and sends the data to the energization control circuit 200.
As described above, the current control circuit 200 collects data such as circuit currents, voltages, temperatures, and the like of main components, and therefore abnormal heating determination is performed as abnormal monitoring control before cooking. For example, when the temperature around the liquid crystal substrate of the integrated display device 100 is higher than the heat-resistant temperature of the liquid crystal display substrate (for example, 70 ° C.), it is determined that the temperature is abnormally high.

  The current detection sensor 227 detects a current flowing through the resonance circuit 225 including a parallel circuit of the right IH coil 6RC and the resonance capacitor 224, and this detection output is supplied to the input unit 201 of the energization control circuit 200, and the storage unit 203 If an undercurrent or an overcurrent is detected as compared with the normal current value of the determination reference data stored in the, the energization control circuit 200 determines that there is some kind of accident or continuity failure, and determines that it is abnormal.

  When there is no abnormality determination by the above self-diagnosis steps, “cooking start preparation is completed”. However, when an abnormality determination is made, predetermined abnormality processing is performed, and cooking cannot be started.

(Cooking mode)
Next, the case where the right IH coil 6RC is used will be described as an example of the case where the cooking mode is shifted to after the pre-cooking abnormality monitoring process is completed.
First, the right operation dial 64R of the front operation unit 60 is turned right or left (the heating power is set according to the amount of rotation).

An operation signal from the front operation unit 60 is input to the energization control circuit 200, and operation signals of various input keys from the upper surface operation unit 61 are input to the energization control circuit 200, and cooking conditions such as a heating power level and a heating time are set. Is done.
Next, the energization control circuit 200 drives the drive circuit 228 to drive the right IH coil circuit 210R. Since the integrated display device 100 is driven by the drive circuit 215, cooking conditions such as heating power and cooking time are displayed in the display area.
Since the drive circuit 228 applies a drive voltage to the gate of the IGBT 225, a high frequency current flows through the IH coil 6RC. As a result, the pan of the object to be heated N becomes hot due to the high frequency magnetic flux from the IH coil 6RC, and the electromagnetic induction heating cooking operation (cooking mode) is started.

  The direct current obtained by the rectifier circuit 221 and the smoothing capacitor 223 is input to the collector of the IGBT 225 that is a switching element. When the drive signal from the drive circuit 228 is input to the base of the IGBT 225, the on / off control of the IGBT 225 is performed. A combination of the on / off control of the IGBT 225 and the resonant capacitor 224 generates a high-frequency current in the right IH coil 6RC, and a pan placed on the top plate above the IH coil 6RC by electromagnetic induction caused by this high-frequency current An eddy current is generated in the object N to be heated. Thus, the eddy current generated in the object to be heated N becomes Joule heat, the object to be heated generates heat, and can be used for cooking.

  The drive circuit 228 has an oscillation circuit, and a drive signal generated by the oscillation circuit is supplied to the base of the IGBT 225 to control the IGBT 225 on / off. By adjusting the oscillation frequency and oscillation timing of the oscillation circuit of the drive circuit 228, the conduction ratio, conduction timing, current frequency, etc. of the IH coil 6RC are adjusted, and the heating power of the IH coil 6RC can be adjusted.

In addition, when the energization stop command of the right IH coil 6RC is issued, the energization to the right IH coil 6RC is stopped, but the cooling fan 30 continues to operate for 2 minutes to 5 minutes even after the energization is stopped. Thereby, hot air remains in the vicinity of the right IH coil 6RC, and the overshoot problem that the temperature rises rapidly can be prevented. Further, it is possible to prevent the adverse effect that the temperature of the integrated display device 100 becomes high.
The operation continuation time is determined from a formula or numerical table that is determined in advance by the energization control circuit 200 in accordance with conditions such as the temperature rise until the energization is stopped, the room temperature, and the operating heat power level of the heating source.

  However, when it is found that the cooling fan itself is out of order, such as when an abnormal current from the cooling blower 30 is detected (for example, when only the temperature of the cooling fins 43A and 43B is rising) Energization to the cooling fan 30 is also stopped at the same time.

  The liquid crystal display substrate of the integrated display device 100 is heated by reflected heat from the bottom of the heated object N heated during cooking by the IH coils 6RC and 6LC and radiant heat from the top plate 21. In addition, when the used hot tempura pan is placed on the center of the top plate 21 as it is, it receives heat from the hot pan (near 200 ° C.). Therefore, in the first embodiment, air cooling is performed from both the left and right sides by the cooling fan 30 in order to suppress the temperature increase of the integrated display device 100.

  Thus, when the cooling fan 30 is driven under a normal operating environment, external air is sucked into the fan case 37 from the suction port 37B of the suction cylinder 37A of the fan case 37. The sucked air is discharged from the outlet 37C forward in the horizontal direction by the rotary blade 30F rotating at high speed inside the fan case 37.

  There is a component case 34 connected in close contact with the fan case 37 at a position in front of the blowout port 37C, and the air introduction port communicates with the blowout port 37C of the fan case 37 in close contact. Inside, air is sent from the blower 30 so as to increase its internal pressure (static pressure). A part of the sent cooling air is discharged from the first exhaust port 34A provided on the upper surface of the component case 34 on the side close to the blowing port 37C.

  The temperature of the air discharged from the first exhaust port 34A is almost the same as the temperature immediately after exiting from the outlet 37C because it does not cool a high-temperature heating element or a heat-generating electrical component on the way, and is fresh. The air remains fresh. The cooling air sent from the first exhaust port 34A to the ventilation space 42F of the cooling duct 42 is ejected upward from the first ejection hole 42CA as shown by an arrow Y3 in FIG. It collides with the lower surface of the coil 6RC and effectively cools the coil. When the shape of the right IH coil 6RC has a gap that allows air cooling air to partially penetrate, the cooling air from the first exhaust port 34A enters the gap and penetrates the gap. To cool upward.

  In addition, fresh (at a low temperature equivalent to room temperature) cooling air is simultaneously supplied from seven first jet holes 42CA formed on the rear upper surface of the upper case 42A constituting the ventilation space 42F and three on the rear side. Since it blows out back and flows toward the side of the power supply board 58 and the central heating source 7, those ambient temperatures can be lowered. Since there is a gap 119 between the power supply board 58 and the horizontal partition plate 25, the temperature rise of the power supply board 58 is suppressed from both the upper surface and the lower surface. Further, the flow toward the side of the central heating source 7 facilitates the flow of the cooling air ejected from the first ejection holes 42CA to the rear, and the central heating source 7 is energized. When it is hot, it becomes very hot, so that hot air does not stay around it.

  On the other hand, the cooling air sent from the blower 30 into the component case 34 is not directed to the surface of the circuit board 41 and does not flow near the surface of the circuit board 41. That is, the cooling air is configured to pass between a large number of heat exchange fin elements centering on the portions of the radiation fins 43A and 43B that are structures projecting on the surface (one side surface) of the circuit board 41. The fins 43A and 43B are mainly cooled.

  Further, among the cooling air pushed into the parts case 34 from the outlet 37C, the fastest main stream flows straight from the outlet 37C forward as indicated by an arrow Y4 in FIG. In 34, it is ejected from the 2nd exhaust port 34B in the most downstream position of the flow of cooling air. Since the second exhaust port 34B has an opening area several times larger than that of the first exhaust port 34A, most of the cooling air pushed into the component case 34 from the outlet 37C is the second exhaust port. It ejects from 34B.

  The blown cooling air is guided into the spaces 42G and 42H of the cooling duct 42, and most of the cooling air is blown out from the blow holes 42CA and 42CB formed on the upper surface of the upper case 42A. It collides with the lower surface of a certain right IH coil 6RC to effectively cool the coil.

  A part of the cooling air guided into the space 42H of the cooling duct 42 is a part of the front part case 46 in which various electric / electronic parts and a light emitting element 57 for displaying the heating power at the time of induction heating cooking are stored. Led inside. Specifically, the cooling air of the blower 30 enters the ventilation space 42H of the cooling duct 42 from the second exhaust port 34B of the component case 34, and from here the ventilation port of the cooling duct 42 formed corresponding to the ventilation space 42H. It passes through 42K and enters the ventilation ports 46R and 46L of the lower duct 46A which is positioned so as to be in close contact with the ventilation port 42K.

  As a result, the liquid crystal display screens (liquid crystal display portions) 45R and 45L are first cooled from below by the cooling air that has entered the front part case 46, and then flow through the front part case 46 and finally from the notch 46C. The built-in components are sequentially cooled in the process of being discharged into the upper component chamber 10. Thereby, the liquid crystal display units 45R and 45L, the integrated display device 100, various electric / electronic components, the light emitting element 57 that displays the heating power during induction heating cooking with light, and the like are sequentially cooled with cooling air. In particular, since the cooling air guided into the front part case 46 is not the air that has cooled the left and right IH coils 6LC and 6RC that become high during induction heating operation, the temperature is low, and the liquid crystal display units 45R and 45L and the integrated air are not integrated. The display device 100 and the like continue to be cooled so that the temperature rise is effectively suppressed while the amount of cooling air is small.

As shown in FIGS. 2, 3, and 5, the cooling air jetted from the first jet holes 42 </ b> CA provided about 10 and the second jet holes 42 </ b> CB provided more than that are provided. It flows in the upper part chamber 10 backward as indicated by arrows Y5 and Y6. The cooling air discharged from the notch 46C to the upper part chamber 10 is joined to the flow of the cooling air and flows to the rear exhaust chamber 12 communicating with the outside of the main body A, so that the exhaust chamber is finally obtained. 12 is discharged.
Next, the case where the heaters 22 and 23 in the grill heating chamber 9 are energized during heating by the right heating source 6R will be described.
Various types of cooking can be performed inside the grill heating chamber 9 by energizing the heaters 22 and 23 simultaneously or individually, and hot air is generated inside the grill heating chamber 9 along with this cooking. For this reason, the internal pressure of the grill heating chamber 9 naturally increases, and naturally rises in the exhaust duct 14 from the rear exhaust port 9E. In the process, the odorous component in the exhaust gas is decomposed by the deodorizing catalyst 120 which is energized to the heater 121 by the driving heater driving circuit 214 and has a high temperature.
On the other hand, since an axial flow fan 106 for auxiliary exhaust is provided in the middle of the exhaust duct 14, the fan 106 is operated against the hot air rising through the exhaust duct 14, and the main body is shown by an arrow Y7. As the air inside the part A is taken into the exhaust duct 14, the hot air in the grill heating chamber 9 is attracted to the fresh air, and as indicated by the arrow Y8 from the upper end opening 14A of the exhaust duct 14 while the temperature decreases. Exhausted.
In this way, by the exhaust flow from the upper end opening 14A of the exhaust duct 14, the air in the rear exhaust chamber 12 adjacent to the opening 14A is also attracted and discharged to the outside. That is, the air in the gap 26 between the grill heating chamber 9 inside the main body and the horizontal partition plate 25 and the air inside the upper part chamber 10 are also discharged through the rear exhaust chamber 12.

Embodiment 2. FIG.
9 to 15 show a cooking device according to Embodiment 2 of the present invention, FIG. 9 is a plan view of the whole, FIG. 10 is a longitudinal sectional view of the blower and a part case part, and FIG. 12 is a cross-sectional view taken along the line XI-XI of FIG. 10, FIG. 13 is a perspective view showing parts of the component case and the cooling duct in an exploded state, and FIG. 14 is a view of the component case and the fan case. FIG. 15 is a side view in the coupled state, and FIG. 15 is an overall plan view showing the installed state of the cooling unit, with the top plate portion removed. In each drawing, the same reference numerals are given to the same or corresponding parts as those in the first embodiment.

  Similarly to the first embodiment, the second embodiment is also provided with a grill heating chamber 9 inside the main body A. In the main body A, the right and left spaces of the grill heating chamber 9 extend in the front-rear direction, and the grill heating chamber 9 The cooling chambers 8R and 8L are separated from each other, and in each of these cooling chambers, a component case 34 containing a circuit board 41 constituting an inverter circuit and a component case 34 coupled to the component case 34 are provided. A cooling unit CU provided with a fan case 37 that forms a blower chamber of the blower 30 is arranged. Then, the rotary blade portion of the blower 30 is built in the air blowing chamber between the fan case 37 and the component case 34, and the cooling air generated in the rotary blade portion is introduced into the component case 34. The cooling air is branched at the component case 34 and is ejected toward the IH coils 6RC and 6LC which are induction heating type heat sources.

  In FIG. 9, a box-shaped grill heating chamber 9 is provided in the center of the body case 2, and an outer wall surface of the grill heating chamber 9 and a gap 118 of about several millimeters are placed on the left and right sides of the grill heating chamber. Upper and lower partition plates 24R and 24L made of metal or a heat insulating material are installed so as to face each other. A space between the right side of the upper and lower partition plates 24R and the inner wall surface (right wall surface) of the main body case 2 is the right cooling chamber 8R, and between the left and right sides of the upper and lower partition plates 24R and the inner wall surface (left wall surface) of the main body case 2 Is the left cooling chamber 8L. That is, the left and right cooling chambers 8L, 8R are separated from the grill heating chamber 9 by the upper and lower partition plates 24R, 24L.

  In the left and right cooling chambers 8L and 8R, left and right cooling units CU are inserted and installed from above. In the installed state, a gap 116 having a spacing of several millimeters is secured between the side surface of the cooling unit CU and the outer wall surface of the grill heating chamber 9, and the opposite side surface of the cooling unit CU and the main body case 2 are secured. A gap 117 having a spacing of several millimeters or narrower than that is also secured between the inner side wall surface and the inner side wall surface. In other words, the cooling unit CU has a width dimension close to the full width of the left and right cooling chambers 8L and 8R, and is installed in a close-contact state so as to cover the effective space of the cooling chambers 8L and 8R. The above-described gaps 118 and 116 are designed so that the thermal influence is reduced with respect to the left and right cooling chambers 8L and 8R assuming that the heat of the grill heating chamber 9 that becomes high temperature is radiated from the wall surface. One of the structures.

In the cooling unit CU, a component case 34 that houses a circuit board 41 that constitutes an inverter circuit, and a fan case 37 that is coupled to the component case 34 and forms a blower chamber of the blower 30 therebetween are integrally coupled. It is a single structure and can be transported as a unit or installed in the main body case 2.
In FIG. 9, “X2” indicates the center point of the right IH coil 6RC, and “X3” also indicates the center point of the left IH coil 6LC. As is apparent from FIG. 9, the right IH coil 6RC and the left IH coil 6LC have a mutual distance as large as possible so that even a large-diameter pan can be heated. The positional relationship is such that part of the outer peripheral edge protrudes also in the upper space. Correspondingly, the cooling duct 42 is also in a positional relationship such that a part of the outer peripheral edge overhangs the space above the left and right cooling chambers 8L, 8R.

Although not shown in FIG. 9, a horizontal partition plate 25 is installed so as to cover the entire space between the left and right partition plates 24 </ b> R and 24 </ b> L, and the upper space of the horizontal partition plate 25 becomes the upper part chamber 10. Yes.
“58” is a power supply board located at the right rear corner of the upper part chamber 10 and partially protruding above the right cooling chamber 8R. From the commercial power supply of 100V or 200V. On the power supply board 58, for example, various electrical component groups for the bridge circuit 221 for rectifying the commercial power supply are mounted.

  “59” is a power supply board located at the left rear corner of the upper part storage chamber 10 and partially protruding above the left cooling chamber 8L. The power supply board 59 is composed of the central heating source 7 and the grill. Power is supplied to the heaters 22 and 23 of the heating chamber 9, electric power is supplied from the power supply board 58, and various electric components for heating capacity (thermal power) control are mounted.

  “42CA” is a first blow-out hole formed by three on the rear part of the upper surface of the upper case 42A of the cooling duct 42 and two on the back side of the upper case 42A constituting the peripheral wall surface of the ventilation space 42F. The cooling air from the cooling duct 42 is supplied directly behind and obliquely behind the cooling duct 42. It should be noted that the diameters of the respective ejection holes 42CA on the upper surface of the upper case 42A are the same, for example, a perfect circle having a diameter of 10 mm.

  Of the two first ejection holes 42CA formed on the back side of the upper case 42A, one faces the power supply board 58 or the power supply board 59, and the other one is on the right or left side of the central heating source 7. It is formed so as to face the position, and fresh cooling air sent from the first exhaust port 34A of the cooling unit CU to the ventilation space 42F is applied to the side of the power supply board 58, the power supply board 59, or the central heating source 7. It is formed so that it supplies toward.

  As shown in FIGS. 10 to 12, the cooling unit CU includes a transparent plastic fan case 37 in which a rib 38 is integrally formed in a circular shape with a constant height on one side surface on the rear side, and on the other side surface of the fan case. The blower chamber 39 is formed between a plastic box-shaped part case 34 that is opened on one side and joined together by being overlapped and a space that is joined to one side of the fan case 37 and surrounded by the ribs 38 in the joined state. Has three parts of a fan case 40 that is partitioned.

  The fan case 40 is formed with a suction port 37B having a sufficient opening area at its upper end, and rotates a suction cylinder 37A extending vertically downward therefrom, and a flow of wind sucked continuously at the end of the suction cylinder 37A. However, it has the guide cylinder part 40A sent to the wing | blade part 30F. Four arm portions 40B project from the surrounding wall surface toward the center portion at the center portion of the guide tube portion 40A, and the motor 300 is fixed to the tip portion of the arm portion 40B.

  “38A” is a bent throat formed by the rib 38 of the fan case 37, and the fan case 40 also includes a wall that is in close contact with the rib 38 including the throat 38A. . The actual opening size (effective inner size) of the suction port 37B is 17 mm in the front-rear direction (depth dimension M2 in FIG. 9) and 80 mm in width (M1 in FIG. 11). It is 6 square centimeters.

The two left and right component cases 34 and 34 have recesses 34C for receiving circuit boards 41 and 41 on which components constituting the inverter circuits 210R and 210L are mounted, respectively. As shown in FIG. 11, a part of the recess 34C extends to the back side of the air blowing chamber 39, and the size when viewed from the side has dimensions of vertical H1 and horizontal width W1 as shown in FIG. Yes. The circuit board 41 has a size almost comparable to the recess 34C, and a large number of components constituting the inverter circuits 210R and 210L for supplying high-frequency power using this large area are mounted.
The periphery of the opening of the component case 34 is in close contact with the periphery of the fan case 37, and the periphery of the fan case 37 is overlapped. The tongue 37F and the side 37G formed on the fan case 37 are tightened with the screw SC1 to be integrated with the component case 34. It has become.
The fan case 40 is also formed with a tongue portion 40F and an attachment portion 40G, which are fastened to the fan case 37 with screws SC2, respectively, to couple the two fan cases 37 and 40 together.

  Between the integrated component case 34 and the fan case 37, a horizontally long rectangular-shaped sealed space communicating with the air blowing chamber 39 through the blowout port 37 </ b> C is formed. However, the first exhaust port 34A and the second exhaust port 34B exceptionally function as communication portions with the outside, and cooling air is forced from these exhaust ports 34A and 34B (at a pressure higher than the atmospheric pressure). Discharged.

  The size of the first exhaust port 34A in the second embodiment is the size of the second exhaust port 34B in FIG. 10 where the height HA is 11 mm and the width WA is 20 mm when viewed from the side. In FIG. 10, the height HB is 11 mm and the width WB is 110 mm. In other words, when viewed from the side, the total of the two exhaust ports 34A and 34B is 14.3 square centimeters, which is slightly larger than the opening area of the suction port 37B of 13.6 square centimeters.

  If the pressure of the wind exhausted from the first exhaust port 34A and the second exhaust port 34B is not increased compared to the atmospheric pressure, the first exhaust port 34A, Although the opening area of the suction port 37B may be made equal to the total opening area of the two exhaust ports 34B, in order to secure a sufficient pressure air, the first exhaust port 34A and the second exhaust port 34B If the opening area of the suction port 37B is sufficiently large compared to the total opening area of the exhaust port 34B, the internal pressure (static pressure) of the cooling unit CU can be further increased.

  “40C” is an inclined guide portion formed in the fan case 40 corresponding to the outlet 37C of the fan case 37, and guides the wind generated in the air blowing chamber 39 to the inside of the component case 34. The suction port 37B of the fan case 37 needs to secure an opening area in order to secure a constant air volume, and therefore the thickness (width dimension) of the portion of the air blowing chamber 39 is increased as shown in FIG. Further, since it is necessary to secure the diameter and thickness of the wing portion 30F and also to secure the installation space of the motor 300, the width and depth dimensions must be increased when viewed in the fan case 37 and the fan case 40 as a whole. However, since the thickness of the component case 34 can be made smaller than the thickness of the air blowing chamber 39 and the like, the inclined guide portion 40C guides the air flow smoothly at the inlet portion where the wind enters the component case 34 from the outlet 37C. . That is, as shown in FIG. 12, at the beginning of the outlet 37C, the width of the passage must be H5, but the inclined guide portion 40C is provided so that the dimension H5 decreases as it goes downstream.

  As shown in FIG. 10, in the fan case 37, the cooling air blowing direction is inclined upward by a certain angle θ1 (for example, 10 degrees) with respect to the horizontal line. Moreover, since the radiation fins 43A and 43B are installed at positions separated from the inner bottom surface of the component case 34 by the predetermined dimensions H2 and H3, the central portion of the flow of cooling air from the blower 30 is the lower end of the radiation fins 43A and 43B. Become a part. If the radiating fins 43A and 43B are installed completely in front of the cooling air blowing direction, the cooling effect of the radiating fins 43A and 43B is enhanced, but cooling is caused by pressure loss when passing through the fine fin elements of the radiating fins 43A and 43B. Such a special configuration is adopted so that the air blowing pressure is lowered and it is not possible to send the air to the second exhaust port 34B, which is essential, with sufficient air volume and pressure. Incidentally, both H2 and H3 are 35 mm.

In addition, the leeward side corner of the fan case 37 has a large curved surface 37K so that the central portion of the flow of cooling air from the blower 30 is easily directed toward the second exhaust port 34B.
“223” is a smoothing capacitor 223 as shown in the circuit diagram of FIG. 7, and “224” is a resonance capacitor 224. Such a tall electric component is supplied from the circuit board 41 as shown in FIG. In the component case 34 in which the height dimension S3 is made as thin as possible, the gap S2 with the inner wall surface may be reduced. Therefore, these components are all angled θ2 in the direction of guiding the wind as shown in FIG. The air is smoothly aligned to the second exhaust port 34B so as to flow smoothly. Incidentally, in this embodiment, S3 is 45 mm and S2 is 25 mm.

  Further, although no circuit component is mounted on the back surface of the circuit board 41, it is installed so that a gap 119 of several mm or less is ensured between the inner surface of the component case 34. In FIG. 10, “260” is an electrical component such as a capacitor.

  In FIG. 10, “262” is a recess formed on the upper wall surface of the component case 34, and the high frequency power generated by the inverter circuits 210 </ b> R and 210 </ b> L is connected to the internal bottom surface 266 via a cord (not shown). A metal terminal 263 is fixed. After the cooling unit CU is installed in the cooling chambers 8R and 8L, if a predetermined cord 264 is connected to the terminal 263, the power connection to the left and right IH coils 6RC and 6LC is established. Can be simple. It should be noted that the cords that draw high-frequency power from the inverter circuits 210R and 210L are not exposed to the outside of the component case 34 until reaching the terminal 263. If the connector 265 is provided at the other end of the cord 264, the connection with the left and right IH coils 6RC and 6LC can be made easier.

  The grill heating chamber 9 is built under the induction heating type heat sources 6RC and 6LC, and a predetermined space SX (FIGS. 9 and 15) is formed between the body case 2 and the trunk back wall constituting the outer shell of the main body. The exhaust duct 14 is installed in the space SX, and the exhaust chamber 12 is formed. The space SX has a depth dimension of about 10 cm to 15 cm. In particular, in the built-in type installed in the kitchen furniture KT such as a sink, the depth dimension of the main body A is limited to a certain range from the installation space of the kitchen furniture, and the exhaust duct that guides the exhaust from the grill heating chamber 9 therein. Therefore, the space SX cannot practically be made zero by this type of cooking apparatus incorporating the grill heating chamber 9.

  In the state where the two independent cooling units CU are inserted and fixed in the cooling chambers 8R and 8L from above, the fan case 37 and the fan case 40 having a large width W3 (see FIGS. 11 and 15) are formed in the space SX. The component case 34 that partially protrudes from the left and right sides and that accommodates the circuit board 41 has left and right side walls of the grill heating chamber 9 and predetermined gaps 116 and 118 formed therein. In addition, the space | gap here means the space | gap between the left and right outer wall surfaces of the grill heating chamber 9, and the right and left partition plates 24 and 24L and the outer surface of the component case 34 referred to in this embodiment. It does not mean only the facing gap 116 therebetween.

As described above, when the fan cases 37 and 40 of the cooling unit CU are partly arranged in the space SX even when the grill heating chamber 9 is present and viewed from the front, as shown in FIG. Since the portion of the fan case 37, 40 of the cooling unit CU partially overlaps the grill heating chamber 9 in the range of the grill heating chamber 9 having the width W4, the width W6 of the main body A increases. Can be prevented.
Since this type of grill heating chamber 9 is desired to be able to cook large objects to be heated such as red sword fish, the grill heating chamber has a restriction that the width of the internal space of the main body A is W5 (see FIG. 15). The width (W4) of 9 needs to be as large as possible. Further, it is necessary to secure a predetermined space SX behind.

  Further, the air blowing chamber 39 connected to the suction port 37B of the cooling unit CU ensures a constant air volume, the diameter and thickness of the blade portion 30F of the multi-blade fan 30 that is rotationally driven, and the suction port 37B. Since it is necessary to secure an air passage that smoothly bends to the blower chamber 39 and also to secure an installation space for the motor 300, the width W3 and the depth dimension L2 when viewed from the fan case 37 and the fan case 40 as a whole. (Refer to FIG. 11) must be large. However, even in such a cooling unit CU, as described above, the fan cases 37 and 40 of the cooling unit CU overlap with the grill heating chamber 9 in a part of the range (symbol WX shown in FIG. 15). Thus, the lateral width W5 of the main body A can be reduced by the overlapping dimension. That is, in this embodiment, considering the feature of the cooling unit CU that the rear suction port 37B is large, the positional relationship with the grill heating chamber 9 is devised, and the cooling unit CU is efficiently and compactly mounted on the main body A. Can be stored.

  In FIG. 13, WF1 to WF5 indicate the flow of cooling air. “42J” is a recess formed in the lower case 42B of the cooling duct 42J, and a blow hole is formed at the tip thereof, and the cooling air WF5 is guided to the lower space of the upper surface operation portion 61. The temperature rise of the operation unit 61 is suppressed.

(Operation of cooling fan 30)
The case where the cooling fan 30 is driven in the above configuration will be described. In this case, it is assumed that the left IH coil 6LC is in induction heating.
When the blower 30 is driven, external air is sucked into the fan case 37 as a blower chamber from the suction port 37B of the suction tube 37A of the fan case 37 (in the left cooling chamber 8L) through the guide tube portion 40A. The sucked air is sent out vigorously from the outlet 37C toward the predetermined angle θ from the horizontal direction by the rotary blade 30F rotating at high speed inside the fan case 37. There is a component case 34 connected in close contact with the fan case 37 at the front position as viewed from the blowout port 37C, and the air introduction port communicates with the blowout port 37C, so that the blower 30 is fed from the blowout port 37C. Due to the air, the internal pressure (static pressure) of the component case 34 increases.

  Since the heat radiating fins 43A and 43B are installed at positions separated from the inner bottom surface of the component case 34 by the predetermined dimensions H2 and H3, the central portion of the flow of the cooling air sent from the blower 30 is indicated by the arrow Y4A in FIG. Thus, it becomes the lower end of the radiation fins 43A and 43B. In other words, the cooling air is not directly blown onto the surface of the circuit board 41, many small electronic components or printed wiring patterns mounted on the circuit board 41, and the like.

  In the second embodiment, as described above, the central portion of the discharge flow of the cooling air is not on the surface of the circuit board 41 and the vicinity thereof, and the central portion of the discharge flow of the cooling air is the radiating fins 43A and 43B. It comes to the non-attachment part side end part (refer to Drawing 11). As a result, oil smoke and dust contained in the air from the indoor space such as the kitchen adhere to the surface of the circuit board 41 with the cooling air, the mounted small electronic components, etc., and the terminal portion due to long-term use. The possibility of accumulation can be kept low, and deposits such as oily smoke and dust accumulate on the circuit board 41 due to long-term use, preventing moisture from absorbing moisture and reducing the electrical insulation of the circuit board 41. it can.

  A part of the cooling air sent into the component case 34 is shown by an arrow Y3 as shown in FIG. 10 from the first exhaust port 34A on the side close to the outlet 37C on the upper surface of the component case 34. Released. The temperature of the released air is almost the same as the temperature immediately after exiting the blowout port 37C because it does not cool the high-temperature heating element or the heat-generating electrical component on the way, and remains fresh air. . At this stage, the air flow is not positive but positive.

  Then, the cooling air sent from the first exhaust port 34A to the cooling duct 42 is ejected upward from the first ejection hole 42CA as shown by an arrow WF2 in FIG. 13, and the right IH coil 6RC located right above is ejected. It collides with the lower surface and effectively cools the coil. In addition, when the shape of the right IH coil 6RC has a gap (through hole) through which air cooling air partially penetrates, the cooling air from the first exhaust port 34A also penetrates the gap. To cool down.

As shown in FIG. 13, three "42CA" are formed on the rear portion of the upper surface of the upper case 42A of the cooling duct 42 and two on the back side of the upper case 42A constituting the peripheral wall surface of the ventilation space 42F. 1 is an ejection hole. The first ejection holes 42CA are formed so as to supply the cooling air from the blower 30 to the rear side and the oblique rear side of the cooling duct 42, and the diameters of the respective ejection holes 42CA are the same, for example, a true diameter of 10 mm. Yen.
On the other hand, the cooling air sent with pressure from the blower 30 to the inside of the component case 34 has a structure projecting on the surface (one side surface) of the circuit board 41 in the process of flowing through the circuit board 41. Since it passes between many heat exchange fin elements of the radiation fins 43A and 43B, the radiation fins 43A and 43B are cooled.

  Furthermore, the main stream, which is the fastest part of the cooling air pushed from the outlet 37C, flows straight forward from the outlet 37C as indicated by the arrow Y4A in FIG. It is ejected from the second exhaust port 34B located at the most downstream position of the wind flow. Since the second exhaust port 34B has an opening area several times larger than that of the first exhaust port 34A, most of the cooling air pushed into the component case 34 from the outlet 37C is the second exhaust gas. It ejects from the mouth 34B.

The cooling air jetted from the second exhaust port 34B is guided into the spaces 42G and 42H of the cooling duct, and most of the cooling wind is jetted from the second jet holes 42CB formed in the upper surface of the upper case 42A. It collides with the lower surface of the left H coil 6LC just above it and cools the coil effectively.
Note that a part of the cooling air guided into the space 42H of the cooling duct is a front part case 46 in which various electric / electronic parts and a light emitting element 57 for displaying the heating power at the time of induction heating cooking are accommodated. Be led into.

  Specifically, the cooling air of the blower 30 enters the ventilation space 42H of the cooling duct 42 from the second exhaust port 34B of the component case 34, and from here the ventilation port of the cooling duct 42 formed corresponding to the ventilation space 42H. It passes through 42K and enters the ventilation ports 46R and 46L of the lower duct 46A which is positioned so as to be in close contact with the ventilation port 42K. Then, the liquid crystal display screens (liquid crystal display portions) 45R and 45L are first cooled from below by the cooling air that has entered the front part case 46, and then flow through the front part case 46 and finally the upper part from the notch 46C. The built-in components and the like are sequentially cooled in the process of being discharged into the component chamber 10. Thereby, the liquid crystal display units 45R and 45L, the integrated display device 100, various electric / electronic components, the light emitting element 57 that displays the heating power during induction heating cooking with light, and the like are sequentially cooled with cooling air.

  In particular, the cooling air guided into the front part case 46 is not the air that has cooled the left IH coil 6LC that has been heated by induction heating, so the temperature is low, and the liquid crystal display units 45R and 45L and the integrated The display device 100 and the like continue to be cooled so that the temperature rise is effectively suppressed while the amount of cooling air is small.

Since the cooling air discharged from the cooling unit CU remains at a positive pressure until reaching the cooling duct 42, the heat of the grill heating chamber 9 is hardly drawn, and a predetermined low-temperature air is passed through the left IH coil 6LC. The lower surface can be supplied through the second ejection hole 42CB.
The cooling air blown from the plurality of first blowout holes 42CA provided in the cooling duct 42 and the many second blowout holes 42CB moves the upper part chamber 10 rearward as shown by an arrow Y5 as shown in FIG. It flows toward. The cooling air discharged from the notch 46C to the upper part chamber 10 is joined to the flow of the cooling air, and finally flows into the rear exhaust chamber 12 communicating (opened) to the outside of the main body A. The exhaust chamber 12 is discharged. In addition, the cooling air ejected from the hole 42J also merges with them.

Embodiment 3 FIG.
16 to 20 show a cooking device according to Embodiment 3 of the present invention. FIG. 16 is a plan view of the whole with the top plate removed, and FIG. 17 is a longitudinal sectional view of an essential part of the upper part chamber. 18 is a perspective view of the whole with the top plate removed, FIG. 19 is a longitudinal sectional view of the grill heating chamber 9, fan case 37 and cooling duct 42, and FIG. 20 is a simplified longitudinal sectional view of the entire apparatus. It is. 16 to 20, the same reference numerals are given to the same or corresponding parts as those in the first embodiment.

  In the third embodiment, the rear partition plate 28 is elongated so as to cover the entire width of the internal space of the main body A, and the suction port 37B of the cooling unit CU is located in the rear space of the left and right ends. Furthermore, the point which formed the big ventilation port 25A (refer FIG. 18) in the plate-shaped member which partitions the upper part of the grill heating chamber 9 up and down, ie, the horizontal partition plate 25, differs from Embodiment 1. FIG. In this ventilation opening 25A, a notch 25B is formed in a portion directly below the power supply board 58 on the right side and the power supply board 59 on the left side. The lower surfaces of the two power supply boards 58 and 59 are separated from the upper surface of the horizontal partition plate 25 by a certain distance HC (see FIG. 17). Of course, the two power supply boards 58 and 59 are installed at a certain distance from the upper surface of the cooling unit CU. ing.

  The horizontal partition plate 25 is installed at a position that secures a predetermined gap 26 between the grill heating chamber 9 and the ceiling surface. As shown in FIG. It flows from the through hole 306 to the gap 26. “305” is a through hole formed in the lower case 42B corresponding to the space 42H of the cooling duct 42, corresponds to the position of the through hole 306, and has the same diameter. “309” is a plurality of legs that support and fix the power supply board 58 to the horizontal partition plate 25, “310” is a large electric component fixed on the power supply board 58, and “311” is also a small electronic component. The power supply board 59 on the left side is similarly provided with the components similar to the legs 309, the electrical components 310, and the small electronic components 311.

“42CA” is a hole on the side wall surface of the cooling duct 42 as described in the second embodiment, one on each side facing the two power supply boards 58 and 59 and one side facing the side surface of the cover 50 of the central heating source 7. They are formed one by one, and a part of fresh air from the cooling unit CU is branched and used as cooling air for the two power supply boards 58 and 59.
“42L” (see FIG. 17) is a step portion in which the outer case 42 of the cooling duct 42 has an outer shape formed in a semicircular portion (arc portion) 42M, and is formed in a semicircular shape with a predetermined width WL. This step portion creates a wide space between the left and right IH coils 6LC and 6RC, thereby reducing the flow of cooling air from the first ejection hole 42CA and the second ejection hole 42CB that hit the IH coils 6RC and 6LC. Has the effect of smoothing.

  The edges of all the first ejection holes 42CA and the second ejection holes 42CB formed on the upper surface (not including the side surface) of the cooling duct 42 are arranged along the direction in which the cooling air flows, that is, An inclined surface that reduces the diameter as it goes from the bottom to the top is formed on the entire circumference, and a guide wall (wind direction guide) 48 that protrudes backward in a bowl shape is formed integrally with a part of the hole edge. Is formed. The diameter 42N of the first ejection hole 42CA based on the tip of the wind direction guide is about 8 mm. That is, since the aperture is originally 12 mm, the wind direction guide 48 protrudes by 4 mm.

  The guide wall 48 is integrally formed so as to face the direction of the power supply boards 58 and 59, that is, directly behind the center points X3 and X2 of the left and right IH coils 6LC and 6RC.

(Operation of cooling fan 30)
A case where the cooling blower 30 is driven in such a configuration will be described. In this case, it is assumed that the right IH coil 6RC is in induction heating.
When the blower 30 is driven, external air is sucked into the cooling unit CU from the suction port 37B. The sucked air is pushed into the part case 34. A part of the sent cooling air is blown into the inside of the cooling duct 42 from the first exhaust port 34A on the upper surface portion of the component case 34 on the side close to the blowout port 37C.

  The temperature of the air ejected from the first exhaust port 34A is almost the same as the external temperature because it does not cool a high-temperature heating element or a heat-generating electrical component on the way, and remains fresh air. . At this stage, since the air flow is not positive but positive, the cooling air sent into the cooling duct 42 is ejected upward from the first ejection hole 42CA as indicated by the arrow WF2 in FIG. , It collides with the lower surface of the right IH coil 6RC just above and cools the coil effectively. At this time, since the direction of the guide wall 48 is unified so as to face directly behind, the direction of the cooling air blown out is unified and flows smoothly backward.

  Further, the cooling air is blown out in the rearward direction from the two first blowing holes 42CA formed in the back wall surface of the upper case 42A constituting the peripheral wall surface of the ventilation space 42F of the cooling duct 42. Wind flow toward

  On the other hand, in the cooling unit CU, the cooling air blown from the second exhaust port 34B located at the most downstream position of the cooling air flow is guided into the spaces 42G and 42H of the cooling duct 42, and most of the cooling air is discharged. Cooling air is ejected from a large number of second ejection holes 42CB formed on the upper surface of the upper case 42A, and collides with the lower surface of the left H coil 6LC just above it to cool the coil effectively. Also at this time, the directions of the guide walls 48 at the rim of the second ejection hole 42CB are all unified so as to face directly behind, so the direction of the cooling air to be ejected is unified and flows smoothly backward.

  On the other hand, a part of the cooling air guided into the space 42H of the cooling duct passes through the through hole 306 of the horizontal partition plate 25 from the through hole 305, and between the horizontal partition plate 25 and the grill heating chamber 9 ceiling surface. It flows into the formed gap 26. As shown in FIG. 17, the air thus flowed flows backward in the gap 26, the cooling air flowing upward from the front of the horizontal partition plate 25, that is, the interior of the upper part chamber 10, and the horizontal partition. After passing through the vent 25A or the notch 25B of the plate 25, they merge.

  That is, as shown in FIG. 20, the cooling air sent from the second exhaust port 34B of the component case 34 of the cooling unit CU cools the right IH coil 6RC, and then passes through the ventilation port 25A and the notch 25B. The air finally flows to the exhaust chamber 12 behind the rear partition plate 28, and the cooling air blown out from the first discharge hole 42CA of the cooling duct 42 also joins this flow, and the power supply board 58 As shown in FIG. 20, the air flows into the exhaust chamber 12 via the vent hole 25A and the cutout portion 25B, and is discharged from the apparatus to the outside. The

Embodiment 4 FIG.
21 and 22 show a fourth embodiment of the present invention, FIG. 21 is a side view of the component case and the fanse in a coupled state, and FIG. 22 is a longitudinal sectional view of the main part of the component case. In the fourth embodiment, a case is assumed in which a user accidentally falls a water container while cooking or cleaning above the top plate 21, and in that case, the intake cylinder 37B is provided inside the cooling unit CU. It is designed to cope with the situation where liquid has entered from the part.

  That is, in this embodiment, the water drainage structure that has entered in two places is provided. The first-stage drainage structure is on the bottom surface of the suction air passage reaching the blower chamber 39 of the fan case 37, and the second-stage drainage structure is on the part case 34 or the bottom of the fan case 37.

The drainage structure provided on the bottom surface of the suction air passage in the first stage changes its direction so that the outside air sucked and lowered from the suction cylinder 37A changes its direction by 180 degrees and enters the air blowing chamber 39 with the wing portion 30F in a spiral shape. It is comprised by the hollow part 51 dented on the bottom wall surface corresponding to a point further, and the through-hole 52 formed in this hollow part.
The diameter of the through hole 52 is desirably several mm or less. If it is too large, the drainage performance is improved, but the amount of intake air from the internal space of the cooking apparatus main body A increases, which may adversely affect cooling by introducing fresh and cold outside air. Even if the diameter of the through hole 52 is several mm, if the length of the through hole is large, air flow resistance is large, so that air is not sucked from the through hole 52 unexpectedly when the blower 30 is operated. Absent.

Next, the second stage drainage structure will be described.
“53” is a drainage through hole formed in a predetermined size on the corresponding bottom wall surface of one or both of the component case 34 and the fan case 37. The specific gravity is less than 1 at a position directly above the through hole. A float / valve 54 is formed which is made of a material such as rubber or plastic in a lightweight or hollow structure, and the drainage through hole 53 is covered from above by its own weight. The surface of the float 54 is water repellent to improve water drainage.

“80” is a guide bar penetrating the vertical hole 54A in the center of the float 54, and guides the vertical movement of the float 54. 81 is a support plate for fixing the guide rod to the outer surface of the bottom wall of the component case 34 or the fan case 37, 83 is a stopper for preventing the float 54 formed at the upper end of the guide rod 80, and 84 is a through hole from the through hole 52 to the through hole. A water tray having an area that covers even below 53, has a volume capable of storing, for example, about 1000 cc of liquid, and is installed in a lower space of the cooling unit CU. In addition, this water saucer is installed upwards so that the fixed gap | interval 85 may be maintained rather than the main-body-part A bottom plate of a heating cooking apparatus. Reference numeral 43A denotes an aluminum radiating fin, and a certain gap H2 is secured upward from the inner bottom surface of the component case 34.
“86” is a plurality of rollers attached to the bottom of the water tray 84 and serves as a wheel when the water tray 84 is pulled forward and taken out.

Because of such a configuration, in the unlikely event that liquid such as water accidentally enters from the upper end opening of the intake cylinder portion 37A, which is an intake port for cooling air, first, a penetration structure that is a drainage structure provided on the bottom surface of the suction air passage The water is drained through the holes 52.
Further, the water remaining without being drained through the through hole 52 does not touch the wing portion 30F which is separated from the bottom of the air passage by a certain distance, and flows through the bottom wall surface of the blower chamber 39 to the direction of the component case 34. As shown by the broken line in FIG. 21, it tries to accumulate up to the water level WW.
Then, the float 54 naturally floats by the intrusion of the water, and the through hole 53 is thereby opened, so that the infiltrated water flows out into the water tray 84 at the bottom. The lower end of the radiating fin 43A is spaced from the bottom surface of the lowest part of the component case 34 by a gap H2 (35 mm in this example), and the conductive portion of the circuit board 41 is a certain distance from the bottom surface of the lowest part of the component case 34, for example, the lowest Since it is separated by 30 mm upwards, even if about 500 cc of water flows in, the infiltrated water does not come into contact with the conductive parts such as the circuit board 41 and the heat radiating fins and the terminal parts of the electrical parts, and the infiltrated water There is no danger that the insulating part of the circuit board 41 is short-circuited. Even if water of the level of water droplets remains, it will naturally dry and disappear while the blower 30 is being operated.

  Normally, the float 54 is lowered by its own weight and closes the through hole 53. However, even if the float 54 does not completely close the through hole portion and the airtightness is not perfect. The minute gap in such a state does not substantially affect the flow of the cooling air and does not impair the cooling performance of the heating coil 6RC and the like. In the actual product, the bottom surface of the component case 34 or the fan case 37 does not need to be completely flat, so that a particularly low portion is intentionally formed on the bottom wall surface and the through hole 53 is formed in the lowest portion. Furthermore, the drainage effect can be enhanced. Further, the number and diameter of the through holes 53 may be set as appropriate.

  As described above, according to this embodiment, the water in the container is inadvertently spilled on the top plate 21 or the pot is laid down to cause the water to flow. Even if it enters from the upper end opening of the intake cylinder portion 37A that is the mouth, it is possible to prevent an accident that the circuit board 41 in the cooling unit CU is short-circuited by such water. And since the water which permeated can be discharged | emitted naturally from the cooling unit CU, the cooking apparatus which can be used safely over a long period of time can be provided. In addition, the water here means not only pure water, but also includes, for example, hot water and juice that have overflowed or spilled from the pan during cooking.

  In addition, the intrusion of water is electrically detected (for example, the movement of the float 54 described above is detected and converted into an electric signal), and the operation of the blower 30 is temporarily stopped or decelerated based on the detection signal, Alternatively, the idea of pulling out the water tray 84 and notifying the user of message information that prompts a specialized repair / inspector to request inspection through the integrated display device 100 is also useful in implementing this embodiment.

  In each of the above-described embodiments, it has been described on the assumption that when the left IH coil 6LC is in induction heating, only the blower 30 in the left cooling chamber is operated and the blower 30 in the right cooling chamber 8R is not operated. The state of use of the cooking device (for example, the case where the left and right IH coils 6RC, 6LC are simultaneously driven to perform another cooking until just before or the central heating source 7 or the grill heating chamber 9 is used) Depending on the environment such as the temperature of the upper part chamber 10, the blowers 30 in the left and right cooling chambers 8L and 8R may be operated at the same time, and the operation speeds (fan performances) of the left and right blowers 30 are not always the same. One or both may be changed as appropriate according to the state of use of the cooking device.

  The outer dimensions of the left and right cooling units CU do not necessarily have to be the same, and the dimensions of each part of the blower 30, the rotating wing 30 </ b> F, the motor 300, the fan cases 37 and 40, and the component case 34 are also cooled ( It can be appropriately changed according to the heat generation amount, size, etc. of the induction heating coil. However, if the maximum heating power of the left and right induction heating sources 6RC and 6LC is the same, the dimensions and specifications of the components of the two cooling units CU can be made as common as possible to reduce production costs and improve assembly. desirable.

Furthermore, the upper and lower partition plates 24R and 24L and the horizontal partition plate 25 are not necessarily required for carrying out the present invention. For example, when the outer wall surface of the grill heating chamber 9 is covered with a heat insulating material, a sufficient gap can be secured with the outer wall surface of the grill heating chamber 9, or the temperature of the gap can be kept low (for example, air It may be omitted for natural convection or forced convection.
Further, a heat shield panel may be attached or a heat insulating film may be formed on the side facing the outer wall surface of the grill heating chamber 9 in the outer wall surface of the cooling unit CU itself. In this way, the facing distance from the outer wall surface of the grill heating chamber 9 can be finalized, and if the width W5 of the main body A is the same, the width dimension W4 of the grill heating chamber 9 can be increased accordingly.
Further, in each of the above embodiments, the example in which the grill heating chamber 9 is provided in the induction heating cooking apparatus has been described. However, the portion may be a space for other uses, and accordingly, the term “ The grill heating chamber 9 "includes a heating chamber other than grill heating or a simple space portion.

  The induction heating cooking apparatus of the present invention can effectively cool the induction heating source while simultaneously cooling the inverter circuit components and the like, so that the cooker dedicated to the stationary type or built-in type induction heating type heating source can be used. It can be widely used for a combined cooking device with a radiant heating source.

The perspective view of the state which decomposed | disassembled some heat cooking apparatuses which concern on Embodiment 1 of this invention. The perspective view which shows the whole main-body part in the state which removed the top-plate part of the apparatus of FIG. The top view of the whole main-body part of the apparatus of FIG. The perspective view of the state which removed the main component and disassembled one part. The longitudinal cross-sectional view in the VV line | wire of FIG. The longitudinal cross-sectional view in the VI-VI line of FIG. The schematic block diagram of the drive circuit of the apparatus of FIG. The longitudinal cross-sectional view which shows the front side upper part of a main-body part. The top view of the whole heat cooking apparatus in Embodiment 2 of this invention. The longitudinal cross-sectional view of the air blower and component case part of the apparatus of FIG. The cross-sectional view of a blower and a component case part. Sectional drawing in the XI-XI line | wire of FIG. The perspective view of the state which the components case and the cooling duct part disassembled. The side view in the combined state of a component case and a fan case. The top view which shows the installation state of a cooling unit. The top view in the state which removed the top plate part of the heat cooking apparatus which concerns on Embodiment 3 of this invention. The principal part longitudinal cross-sectional view of the upper part chamber of the apparatus of FIG. The perspective view of the whole in the state which removed the top plate part of the apparatus of FIG. FIG. 17 is a longitudinal sectional view of a grill heating chamber, a fan case, and a cooling duct portion of the apparatus of FIG. 16. FIG. 17 is an overall simplified longitudinal sectional view of the apparatus of FIG. 16. FIG. 10 is a side view of a component case and a fan case according to a fourth embodiment of the present invention in a combined state. The principal part longitudinal cross-sectional view of the component case of FIG.

Explanation of symbols

  2 Body case, 6RC, 6LC Induction heating type heating source (IH coil or IH heating coil), 7 Central heating source, 8R, 8L Cooling chamber, 9 Grill heating chamber, 12 Exhaust chamber, 21 Top plate, 22, 23 Seed heater 24L, 24R Left and right partition plates, 25 Upper and lower partition plates, 30 Blower, 32 Rotating shaft of blower, 34 Parts case, 34A First exhaust port, 34B Second exhaust port, 37 Fan case, 37B Fan case suction port , 37C Fan case outlet, 40 Fan case, 41 Circuit board, 42 Cooling duct, 42CA First outlet hole, 42CB Second outlet hole, 42L Step, 43A Radiation fin, 48 Guide wall, 58, 59 Power supply substrate.

Claims (14)

A main body case in which an induction heating source and a blower are housed and a grill heating chamber is formed;
A top plate covering the upper surface of the main body case;
The induction heating type heat source disposed below the top plate;
A front part case that is disposed below the top plate at the front of the main body case and stores at least a display device that displays the heating power during induction cooking or a substrate on which the display device is mounted;
A circuit board on which an inverter circuit for supplying high-frequency power to the induction heating source is mounted;
The blower for supplying cooling air to the internal space of the body case;
The grill heating chamber formed below the induction heating source;
An exhaust chamber partitioned into a rear portion in the main body case and having a terminal portion communicating with an external space;
An upper part chamber that is located behind the front part case and above the grill heating chamber, the induction heating type heat source and the power supply board are arranged, and communicated with the exhaust chamber ;
The main body case has cooling chambers extending in the front-rear direction on the right and left sides of the grill heating chamber and isolated from the grill heating chamber, respectively.
Each cooling chamber includes a fan case having the blower therein and an outside air suction port and a blowout port, and a component case in which cooling air discharged from the fan case is introduced and the circuit board is accommodated. And install
A cooling duct that communicates the component case with the lower space of the induction heating source;
Wherein the cooling duct, the cooling air supplied from the component case, a first ejecting hole for supplying to said power supply board, and the second ejecting holes supplied to the induction heating type heat source, said front part With a vent to be supplied to the case ,
The component case is provided with a first exhaust port and a second exhaust port on the downstream side of the first exhaust port in the flow of cooling air,
Wherein the first ejecting hole, the supply cooling air from the first exhaust port in the component case, wherein the second ejection hole and the vent hole, the second exhaust in said component case Supply cooling air from the mouth,
Air that has cooled the display device and exited from the front part case passes through the upper part chamber, exited from the first ejection hole, cooled the power supply board, and exited from the second ejection hole. The induction heating cooking apparatus, wherein the induction heating type heat source is discharged from the exhaust chamber to the outside of the main body case together with air cooled .   The induction heating cooking apparatus according to claim 1, wherein the second exhaust port is opened to a size that is at least twice as large as the first exhaust port.   The induction heating cooking apparatus according to claim 1 or 2, wherein the blower is a centrifugal multi-blade blower having a horizontal rotating shaft.   The induction heating cooking apparatus according to any one of claims 1 to 3, wherein the suction port of the fan case extends to the vicinity of a rear upper surface of the main body case.   The induction heating cooking apparatus according to any one of claims 1 to 4, wherein the cooling duct is internally partitioned into a plurality of passages, and the ejection holes are formed for each of the sections.   The induction heating cooking apparatus according to any one of claims 1 to 5, wherein the grill heating chamber and the cooling chamber are separated by a left and right partition plate made of metal or a heat insulating material.   The induction heating cooking apparatus according to any one of claims 1 to 6, wherein the grill heating chamber and the cooling duct are separated by an upper and lower partition plate made of metal or a heat insulating material.   The circuit board housed in the component case includes a switching element to which a high-voltage current for the inverter circuit is supplied, and a radiating fin to which the switching element is attached, and the blower around the radiating fin. The cooling air from the blower is configured to flow, and the cooling air sent from the blower is discharged from the first exhaust port before reaching the radiating fin. The induction heating cooking apparatus according to any one of claims 1 to 7.   The induction heating cooking apparatus according to any one of claims 1 to 8, wherein the component case is formed in a box shape, and a blowout port of the fan case is connected to a lower portion of a side surface of the component case.   The circuit board is installed vertically near the outer casing of the main body case inside the component case, and the radiation fins are installed so as to protrude from the circuit board to the grill heating chamber side, below the radiation fins. The induction heating cooking apparatus according to claim 8 or 9, wherein the space is a central portion of a flow of cooling air supplied from the blower.   The said fan case has a guide cylinder part which guides the air inhaled from the said suction inlet to the ventilation chamber with the said air blower, rotating the flow. The induction heating cooking apparatus as described.   The inclined guide part which makes the air path width different so that the ventilation from the said ventilation chamber may flow through the said component case smoothly may be provided in the blower outlet side of the said fan case. Induction heating cooking equipment.   The cooling duct is installed in a face-down state below the induction heating type heat source, and a step portion is formed on the outer peripheral edge of the cooling duct to increase the facing distance from the induction heating type heat source. The induction heating cooking apparatus according to any one of claims 1 to 12.   The guide wall for restricting the direction of the cooling air to be ejected to a predetermined direction is provided in at least one of the first ejection hole and the second ejection hole of the cooling duct. The induction heating cooking apparatus in any one of 13.

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