JP2011028928A - Induction heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To raise signal-related reliability of touch keys arranged on a plate, and to remove adverse effect of heat on an integrated circuit caused by temperature transmission from a pan as a cooked object. <P>SOLUTION: In an induction heating cooker having an inverter circuit for supplying power to a heating coil 13, a blower fan 20 for ventilating cooling wind to a back surface of the plate 3, the heating coil 13, and the inverter circuit, and the touch keys setting heating conditions and arranged on the plate 3, an operation board 12 is arranged at a lower face of the plate 3 so as to face the touch keys, an electrode 36 is arranged on an upper face of the operation board 12, and the integrated circuit 37 for detecting change of electrostatic capacity detected on the electrode 36 is arranged on a lower face of the operation board 12 by separating from the electrode 36. A board surface of the operation board 12 having the electrode 36 is fixed so as to be in close contact with the plate 3, and a gap A is maintained between the board surface of the operation board 12 having the integrated circuit 37 via a spacer 16 and the plate 3 in order to make the cooling wind from the blower fan 20 pass through the gap A. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an attachment structure for an operation board disposed on a lower surface of a plate so as to face the touch key in an induction cooking device having a touch key for setting a heating condition on a plate on the upper surface of a main body.

  An induction heating cooker is a device in which a pan, which is an object to be heated, is placed on a plate disposed on the upper surface of the main body, and the pan is heated by a heating coil provided in the main body below the plate. An operation unit for setting the heating power and heating time of the heating coil is arranged at the upper part.

  In order to improve usability and cleanability, the operation unit preferably has a structure with as little as possible unevenness. For this reason, the operation keys constituting the operation unit have no unevenness and are non-contact to detect an input operation from a change in capacitance. The touch key method of the type has come to be preferred (Patent Document 1).

JP-A-2005-251503

  In the cooking device shown in Patent Document 1, a touch key 18 that is an operation unit is arranged on the front surface or the back surface of the top plate 2 (plate), and the operation circuit board is disposed below the top plate 2 so as to face the touch key 18. 19 is arranged on the operation circuit board 19, and short-shaped detection electrodes 20 formed of a conductive material so as to face each key of the touch key 18 are arranged by printed wiring, and these are arranged on the back surface. An IC chip 21 or the like for detecting the input to the touch key 18 by the detection electrode 20 is disposed.

  However, since the above-described operation circuit board 19 is attached in close contact with the top plate 2, the temperature of the pan or the like placed on the top surface of the top plate 2 is easily transmitted to the operation circuit board 19. When cooking the oil, the oil temperature may be 180 ° C. or higher, and depending on how the pan is placed, the temperature of the IC chip 21 of the operation circuit board 19 exceeds the heat resistance temperature of the IC chip 21, There are problems that cause malfunctions such as malfunctions.

The present invention has been made in order to solve the above-mentioned drawbacks. In claim 1, the main body of the induction heating cooker, the plate placed on the upper surface of the main body and placing the pan as the object to be heated, A heating coil provided in the main body below the plate for heating the pan, an inverter circuit for supplying high-frequency power to the heating coil, and cooling air is blown to the back surface of the plate, the heating coil, and the inverter circuit In an induction heating cooker provided with a blower fan and a touch key that is provided on the plate and sets heating conditions for the pan,
An operation board is disposed on the lower surface of the plate so as to face the touch key, an electrode is provided on the upper surface of the operation board, and an integrated circuit that detects a change in capacitance detected by the electrode is provided on the lower surface of the electrode. The operation board provided with the electrode is fixed so that the substrate surface of the operation board is in close contact with the plate, and a spacer is interposed between the substrate surface of the operation board provided with the integrated circuit and the plate. Thus, a gap is maintained, and cooling air from the blower fan is allowed to flow through the gap.

  According to the present invention, the spacer is interposed between the substrate surface of the operation board provided with the integrated circuit and the plate so that the gap is held, and the cooling air from the blower fan is allowed to flow through the gap. Even when tempura cooking or the like is performed on the circuit, the adverse effect of heat on the integrated circuit due to temperature transmission from the pan is eliminated, and the cause of failure such as malfunction can be eliminated.

  Moreover, the reliability of the touch key provided in the plate can be improved thereby, and a good quality induction heating cooker can be provided.

It is a perspective view of the state where the induction heating cooking appliance of the present invention was stored in the system kitchen. It is explanatory drawing which shows the state which removed the plate of the induction heating cooking appliance. It is the principal sectional view seen from the side of the induction heating cooking appliance. It is explanatory drawing of the upper surface operation part of the same induction heating cooking appliance. It is explanatory drawing which attached the operation board to the plate of the same induction heating cooking appliance. It is sectional drawing of the operation board | substrate of the same induction heating cooking appliance. It is explanatory drawing which shows the positional relationship of the position of the pan of the same induction heating cooking appliance, and an operation board.

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

  In addition, the present Example may be a stationary heating cooker that is placed in the kitchen in addition to the built-in type that is fitted in the kitchen.

  The main body 2 of the heating cooker is incorporated by being dropped from the upper surface of the system kitchen 1 and installed.

  A pan (not shown) of an object to be cooked for cooking can be cooked by being placed on the placing portion 6 on the plate 3 made of heat-resistant glass or the like disposed on the upper surface of the main body 2.

  The placement unit 6 has a placement unit right 6a and a placement unit left 6b arranged in front of the upper surface of the plate 3 on the upper surface of the main body 2, and is placed in the back (center rear) between the placement units 6a and 6b. The center 6c is arranged. And the heating coil unit 25 mentioned later for heating a pan below each mounting part 6 on both sides of the plate 3 is each installed. The arrangement is such that the heating coil unit right 25a is below the placement portion right 6, the heating coil unit left 25b is below the placement portion left 6b, and the heating coil unit center 25c is below the placement portion center 6c. Is provided.

  A frame 14 is provided on the peripheral end surface of the plate 3 to protect the plate 3. The frame 14 includes a frame front 14a attached to the upper upper edge of the front of the plate 3, a frame rear 14b attached to the rear upper edge of the plate 3, a 14c attached to the right upper edge, and a frame attached to the left upper edge. 14d on the left.

  Inside the main body 2, there are provided a heating coil unit 25, which will be described later, which is a heat generating member, and an electronic component constituting a control circuit. The heating coil unit 25 and the control circuit are provided behind the heating coil unit 25 for cooling them. A blower fan 20, an intake port 7 for sucking air from the outside of the main body 2, and an exhaust port 8 for discharging exhausted air after cooling are provided.

  The air sucked through the air inlet 7 is discharged from the air outlet 8 to the outside of the main body 2 after cooling a later-described heating coil unit 25 and electronic components that generate heat inside the main body 2.

  Further, on the left side of the main body 2, a roaster 4 for baking fish, pizza and the like is provided.

  Next, the heating coil will be described. A heating coil unit 25 for heating a pan (not shown) is composed of a heating coil 13, a coil base 24, and ferrite (not shown). A certain gap is provided between the plate 3 and the heating coil unit 25, and a part of the cooling air from the blower fan 20 is allowed to flow through the gap to cool the back surface of the plate 3 and the heating coil unit 25. is doing.

  The winding of the heating coil 13 employs litz wire to suppress the skin effect. A voltage of several tens of kHz and several hundreds of volts is applied to the heating coil 13 from an inverter 72 described later in order to heat a cooking pan (not shown).

  The coil base 24 fixes the heating coil 13 from below, and ferrite (not shown) is embedded substantially radially.

  In addition, a temperature detection element 21 that detects the temperature of the pan, such as during automatic cooking, is attached to a space in a substantially central portion of the heating coil 13.

  Next, cooling of the heating coil 13 and the inverter board will be described.

  The inverter board is composed of a left and right inverter board 18 on which inverter circuits for driving the left and right heating coils 13a and 13b are mounted, and a central inverter board 17 for driving the heating coil center 13c.

  The left and right inverter boards 18 and the central inverter board 17 are arranged in a board case 26, and the heat radiating fins 22 and 23 are configured to efficiently exchange heat generated by electronic components with cooling air from the blower fan 20 to lower the temperature. Is provided.

  Cooling outside air sucked from the air inlet 7 by the blower fan 20 flows through the board case 15 and takes heat from the left and right inverter boards 18, the central inverter board 17, and the electronic components of the control board 19 on which the control circuit is mounted. After that, the air is blown out of the substrate case 26, and each heating coil 13, other components in the main body 2 and the back surface of the plate 3 are cooled, and then discharged from the exhaust port 8 to the outside.

  The substrate case 26 is installed below the heating coil unit right 25a opposite to the heating coil unit left 25b where the roaster 4 is installed. In this embodiment, it is installed below the heating coil unit right 25a, and by disposing the left and right inverter boards 18 and the central inverter board 17 therein, the radiant heat from the heating coils 13 and the roaster 4 is blocked during cooking, An air passage through which the cooling air passes is formed so that the cooling air can be efficiently distributed.

  Next, the operation unit and the display unit will be described.

  The upper surface operation unit 9 is configured by touch keys and is provided on the front side of the plate 3. The details of the operation unit 9 are as shown in FIG. 4. From the right corresponding to the placement unit right 6a, the placement unit center 6c, and the placement unit left 6b, the upper operation unit right 9a, the upper operation unit center 9c, and the upper surface An operation unit left 9b is disposed, and an upper surface display unit 10 including an upper surface display unit right 10a, an upper display unit center 10c, and an upper display unit left 10b is provided above each upper operation unit 9.

  The upper surface display unit 10 is pressed against the plate 3 by a display holder 32, and a display substrate 33 including a drive circuit for displaying characters and the like on the display unit is fixed at the center.

  Next, the upper surface operation part 9 (typically the upper surface operation part right 9a) which sets the heating conditions to a pan is demonstrated. Reference numeral 48 denotes a cut / start key for starting and stopping cooking, and the LED lamp 53 is lit during cooking.

  The heating power for cooking is selected by the heating power key 49. The thermal power key 49 is divided into four-stage keys of hot fire, low fire, medium fire, and high fire, and the necessary fire power can be set by a single operation. Of the four stages of the thermal power key 49, the hot key 49a can be set to "1", the low fire key 49b can be set to "4", the middle fire key 49c can be set to "7", and the high fire key 49d can be set to "10". The LED lamp 54 in the part lights up.

  Reference numeral 51 denotes a timer key that is selected mainly when performing timer cooking such as boiling or heat retention. Reference numeral 52 denotes a menu key for selecting cooked rice, fried food, kettle, etc. for automatic cooking. When the menu key 52 is pressed, a menu is displayed on the upper surface display unit 10 and is displayed each time the menu key 52 is pressed. The menu changes, and this selects the menu to be used.

  Moreover, the setting key 50 can be used to adjust the heating power, set the time during timer cooking, set the amount of rice during cooking, set the automatic cooking finish, and set the oil temperature when frying. . This setting key 50 is composed of an UP key 50a for increasing the quantity at the time of setting and a DOWN key 50b for decreasing, and indicates that the setting key 50 is valid when the LED lamp 55 in the setting key 50 section is lit. When turned off, it is invalid.

  Since the upper surface operation unit left 9b has the same operation and arrangement as the upper surface operation unit right 9a, description thereof will be omitted.

  Next, the upper surface operation unit center 9c will be described. The main cooking of the mounting portion center 6c is heat insulation and stew. Therefore, the heating power of the heating coil center 13c is designed to be smaller than the heating power of other heating coils. For this reason, it is sufficient for the heat power notation to be low heat, low heat, medium heat, and even if the setting key 62 is cyclic type, it will return to its original state when it is pressed three times at maximum, so that each heat power like the two heating coils 25a, 25b in the foreground. There is no thermal power setting key corresponding to.

  Each key of the above-described upper surface operation unit 9 is printed on the plate 3, and the operation board 12 is disposed on the lower surface of the plate 3.

  The operation board 12 is divided into an operation board 12a and an operation board 12b. The operation board 12a corresponds to the upper surface operation part right 9a and the upper surface operation part center 9c, and the operation board 12b corresponds to the upper surface operation part left 9b.

  The upper surface of the operation board 12 is provided with an electrode 36 for detecting a change in capacitance caused by touching each key of the upper surface operation unit 9 with a finger, and the lower surface is provided with a change in capacitance detected by the electrode 36. An integrated circuit 37 for a detection circuit that detects the signal and converts it into a digital signal that can be determined by a control circuit (not shown) is provided apart from the electrode 36.

  Specifically, the operation substrate 12a is widened so as to surround the upper surface display unit center 10c between the upper surface display unit right 10a and the upper surface display unit center 10c, and an integrated circuit 37 is provided on the lower surface of the expanded substrate. Yes. Similarly, the operation substrate 12b is spread so as to surround the upper surface display portion center 9c from between the upper surface display portion left 9b and the upper surface display portion center 9c, and is mounted on the lower surface of the expanded substrate.

  The operation substrate 12 is arranged so that the substrate surface provided with the electrode 36 is pressed against the plate 3 by the sash plate 15 and the substrate holder 32 so that no gap is generated between the electrode 36 and the plate 3. And fix. The sash plate 15 is fixed so as to be sandwiched between the front frame 14 a so as to press the operation substrate 12 against the back surface of the plate 3.

  Further, the operation substrate 12 is extended between the upper surface display portions 10, and a gap 16 is held between the substrate surface on which the integrated circuit 37 is provided on the lower surface and the plate 3 with the gap A interposed therebetween. Cooling air from the blower fan 20 is allowed to flow through A.

  The spacer 16 is made of silicon rubber so as to maintain heat resistance and electrical insulation even when a heated pan is placed on the plate 3, and the space between the substrate surface on which the integrated circuit 37 is provided and the plate 3 is maintained. The gap A is opened by about 2 mm.

  Reference numeral 34 denotes a cable for connecting the substrates.

  The control circuit incorporated in the control board 19 is based on the contents set in the operation unit 9 and a program such as automatic cooking incorporated in advance. It is sent to the inverter board 18 and the central inverter board 17 to control the heating coil 13 and the like.

  At the same time, the blower fan 20 is controlled, and the blower fan is operated during cooking.

  The present embodiment has the above configuration, and the operation thereof will be described next.

  For example, when frying tempura, croquettes, fries, etc., the menu is set to fried food by touching the menu key 52 of the upper surface operation unit right 9a with a finger while viewing the upper surface display unit right 10a. Next, the set temperature is set to 200 ° C. with the UP key 50a and the DOWN key 50b.

  When the setting is completed, oil is poured into the tempura pan and the tempura pan is placed within the display on the placement portion right 6a (a in FIG. 7).

  When all the preparations are complete, touching the cut / start key 48 starts energization of the heating coil 13a, and heating of the tempura pan is started.

  As heating is started and the temperature of the tempura pan rises, the temperature of the oil in the tempura pan also rises, and at the same time, the heat of the tempura pan heats various parts arranged under the tempura pan through the plate 3. .

  At the same time as heating is started, the blower fan 20 is energized, and cooling to the control circuit 19, the left and right inverter boards 18, the heating coil 13, and the back surface of the plate 3 is started.

  The temperature of the tempura pan is controlled by detecting the temperature of the tempura pan through the plate 3 by the temperature detecting element 21 provided in the heating coil 13 and using the control circuit provided on the control board 19 based on the detected value. The energization to 13 is controlled, and the temperature of the tempura pan is controlled to keep the set temperature of 200 ° C.

  In the main body 2, during the heating, the blower fan 20 always operates and sucks outside air from the intake hole 7, and the central inverter board 17, the left and right inverter boards 18, the control board 19, the heating coil 13, and the plate in the main body 2. 3 The back surface and the like are cooled, and the waste heat thereafter is discharged from the exhaust port 8. For this reason, the temperature of the electronic components and the heating coil 13 mounted on each substrate can be maintained at a temperature that is sufficiently within the operating temperature range of each component, and is discharged from the exhaust port 8 at this time. The temperature of waste heat is about 60 ° C.

  Moreover, since the temperature of the integrated circuit 37 of the operation board 12 attached to the plate 3 is also sufficiently away from the tempura pan mounted on the mounting portion 6, there is no influence of the temperature of the tempura pan. .

  Next, when the position of the tempura pan is shifted from the placement unit 6, for example, when the pan is moved toward the center of the upper surface display unit 10 c (b in FIG. 7), the tempura pan is the operation board 12 a. Is located directly above the integrated circuit 37.

  In this case, the temperature of the tempura pan is transmitted to the inside of the main body 2 through the plate 3. However, in the operation board 12a, the place where the integrated circuit 37 is mounted by the spacer 16 is about 2 mm away from the plate 3, so that there is no direct heat conduction from the plate 3, and further the cooling air from the blower fan 20 has a gap. The heat flowing into A and transmitted from the tempura pan is greatly reduced, and adverse effects due to heat on the integrated circuit 37 are prevented.

  As described above, according to the present embodiment, a gap is held by interposing a spacer between the substrate surface of the operation board provided with the integrated circuit and the plate, and cooling air from the blower fan is supplied to the gap. Since the integrated circuit is made to flow, even when tempura cooking or the like is performed, the adverse effect of heat on the integrated circuit due to temperature transmission from the pan is eliminated, and the cause of failure such as malfunction can be eliminated.

  Moreover, the reliability of the touch key provided in the plate can be improved thereby, and a good quality induction heating cooker can be provided.

DESCRIPTION OF SYMBOLS 1 System kitchen 2 Main body 3 Plate 6 Mounting part 9 Upper surface operation part 10 Upper surface display part 12 Operation board 13 Heating coil 16 Spacer 20 Blower fan 36 Electrode 37 Integrated circuit

Claims (1)

The main body of the induction heating cooker;
A plate for placing a pan, which is an object to be heated, disposed on the upper surface of the main body;
A heating coil provided in the body below the plate for heating the pan;
An inverter circuit for supplying high-frequency power to the heating coil;
A blower fan for blowing cooling air to the back surface of the plate, the heating coil, and the inverter circuit;
Touch keys provided on the front side of the plate to set heating conditions for the pan,
In an induction heating cooker equipped with
An operation board is arranged on the lower surface of the plate so as to face the touch key,
An electrode is provided on the upper surface of the operation substrate, and an integrated circuit for detecting a change in capacitance detected by the electrode is provided on the lower surface away from the electrode.
Fixing the substrate surface of the operation substrate provided with the electrodes so as to be in close contact with the plate;
An induction heating cooker characterized by holding a gap between a plate surface of an operation board provided with the integrated circuit and the plate with a spacer and flowing cooling air from the blower fan through the gap. .

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