JP2009026570A - Induction-heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an induction-heating cooker capable of reducing the difference between a detected pan temperature and an actual pan temperature and inform the appropriate temperature at appropriate timing even when detecting a pan temperature by a thermistor. <P>SOLUTION: The induction-heating cooker includes a plate to place a pan on it, a heating coil unit made of a heating coil to heat a pan and a coil base to secure the heating coil from beneath to heat a pan, a temperature detector disposed on the heating coil unit to detect the temperature of a pan on the plate, an inverter circuit to supply electric power to the heating coil, a menu selection means to select a menu item from a plurality of preset automatic menu items, and a control means for controlling the inverter circuit to heat at a low heating rate for a preset time period and then heat at a high heating rate until the temperature detected by the temperature detector reaches an appropriate temperature when preheating to the appropriate temperature according to the menu item selected by the menu selection means. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an induction heating cooker.

  There exists a thing of patent document 1 as an induction heating cooking appliance which alert | reports the remaining time until the oil temperature of a pan reaches preset temperature. This induction heating cooker has a top plate disposed on the upper surface of the main body, a heating coil and a temperature detection device are provided inside the main body, an operation portion for the heating coil is provided on the front surface of the main body, and the top plate In the induction heating cooker having a frying temperature control function for controlling the oil temperature in the pan placed on the top plate by the temperature detection device, provided with a display unit for displaying the setting state or operation state of the heating coil, After the oil temperature in the pan has reached the preset temperature 1 set in advance by the temperature detector, the preset temperature (T) is maintained within the preset temperature 1 and the preset temperature 2 above the preset temperature (T). ) After the temperature has elapsed, and the remaining time of the designated time (T) is displayed on the display unit when the set temperature 1 is reached.

JP 2005-100790 A

  The induction heating cooker of patent document 1 has shown the example which used the thermistor as a temperature detection apparatus provided in the center of a heating coil. Although this configuration can detect the appropriate temperature when cooking with the preferred shape of the pan in the proper position, the pan of the unfavorable shape (e.g., a pan with a bent pan bottom or a depressed pan bottom) When the pan is used, or when the small-diameter pan is placed at an unfavorable position (for example, a position greatly deviated from the normal position), the actual tracking performance cannot be secured sufficiently. Only a temperature lower than the pan temperature may be detected. The relationship between the pan temperature, the detected temperature, and the heating power when heating an unfavorable pan-shaped pan will be described with reference to FIG. In Fig.8 (a), a continuous line shows actual pan temperature and a broken line shows the detection temperature detected by a temperature detection apparatus. Moreover, FIG.8 (b) shows the thermal power given to a pan by a heating coil. As shown here, when the detected temperature falls within the appropriate temperature range in FIG. 8, the heating power is lowered. However, since the detected temperature and the pan temperature are different, when the detected temperature reaches the appropriate temperature, the pan temperature is already at the appropriate temperature. Has been exceeded.

  The present invention aims to provide an induction heating cooker that can reduce the difference between the detected temperature and the actual pan temperature even when the temperature of the pan is detected using a thermistor and can notify the appropriate temperature at an appropriate timing. .

  An induction heating cooker according to claim 1 is a heating coil unit comprising a plate for placing a pan, a heating coil for heating the pan, and a coil base for fixing the heating coil from below, and the heating coil unit. A temperature detecting element that is arranged and detects the temperature of the pan on the plate, an inverter circuit that supplies power to the heating coil, and a menu for selecting a menu to be used from a plurality of automatic menus that are built in advance When preheating is performed until the temperature is selected according to the selection means and the menu selected by the menu selection means, the temperature detected by the temperature detection element becomes an appropriate temperature after low heating power heating for a predetermined period. And control means for controlling the inverter circuit so as to perform high heating power heating.

  An induction heating cooker according to claim 2 is a heating coil unit comprising a plate for placing a pan, a heating coil for heating the pan, and a coil base for fixing the heating coil from below, and the heating coil unit. A temperature detecting element that is arranged and detects the temperature of the pan on the plate, an inverter circuit that supplies power to the heating coil, and a menu for selecting a menu to be used from a plurality of automatic menus that are built in advance When performing preheating until a suitable temperature corresponding to the menu selected by the selection means and the menu selection means is obtained, after heating for a predetermined time with the first low heating power, the second heating power lower than the first low heating power 2. Control for controlling the inverter circuit to perform heating for a predetermined time with a low heating power of 2 and to perform high heating power until the temperature detected by the temperature detecting element reaches an appropriate temperature. It shall be equipped with a stage, a.

  An induction heating cooker according to claim 3 is a heating coil unit comprising a plate for placing a pan, a heating coil for heating the pan, and a coil base for fixing the heating coil from below, and the heating coil unit. A temperature detecting element that is arranged and detects the temperature of the pan on the plate, an inverter circuit that supplies power to the heating coil, and a menu for selecting a menu to be used from a plurality of automatic menus that are built in advance When preheating is performed until the temperature becomes appropriate according to the selection means and the menu selected by the menu selection means, heating is performed at 0.2 to 0.3 kW for 180 to 210 seconds, and then detected by the temperature detection element. And a control means for controlling the inverter circuit so as to perform heating at 1.4 kW until the temperature of 210 to 230 ° C. is reached.

  According to the induction heating cooker of the present invention, even when the temperature of a pan is detected using a thermistor, the difference between the detected temperature and the actual pan temperature can be reduced, and an appropriate temperature can be notified at an appropriate timing.

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

  FIG. 1 is a block diagram showing an embodiment of the induction heating cooker of the present invention.

  Reference numeral 26 denotes a metallic pan of the object to be heated. Reference numeral 13 denotes a heating coil for heating the pan, and the winding of the heating coil 13 employs a litz wire to suppress the skin effect. 18 is an inverter circuit 18 that supplies power to the heating coil 13 in order to heat the pan 26, and specifically, a voltage of several tens of kHz and several hundreds of volts is applied. The heating coil 13 and the inverter circuit 18 are collectively referred to as a heating means 23. Here, an induction heating method will be described as an example of the heating means 23, but the present invention is not limited to the induction heating method.

  Reference numeral 20 denotes a temperature detection element for detecting the temperature of the pan 26, and a thermistor whose resistance value varies depending on the detected temperature is used. A menu 34 is used to select a menu to be used from a plurality of automatic menus incorporated in advance by the menu setting means. Reference numeral 31 denotes a thermal power setting means which allows the user to adjust the thermal power according to his / her preference. Reference numeral 17 denotes a display means for displaying a menu selected by the menu setting means 34, a display of the progress of automatic cooking, and the setting contents of the heating power setting means 31. Reference numeral 19 denotes a control means for controlling the heating power, the heating time, and the temperature of the pan 26 based on a procedure or rule in which the menu input by the menu setting means 34 is incorporated in advance. Based on the detected temperature, the heating means 23 is controlled to heat the pan 26, the heating means 23 is controlled to heat the pan 26 with the thermal power input from the thermal power setting means 31, or the menu setting means 34 is input. The displayed menu, the progress of cooking, and the contents input by the heating power setting means 31 are displayed on the display means 17.

  2 to 4 show an induction heating cooker employing an embodiment of the present invention.

  FIG. 2 is a perspective view of the built-in induction heating cooker stored in the system kitchen. Drawing 3 is an explanatory view showing the upper surface of an induction heating cooking appliance. FIG. 4 is an explanatory view with the plate of the induction heating cooker removed.

  In addition, the present Example is not limited to the built-in type that fits in the kitchen, but may be a stationary heating cooker that is placed 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. After installation, a roaster (grill) 4 and an operation panel 5 described later can be operated from the front surface of the system kitchen 1.

  The pot for cooking is placed on a plate 3 made of heat-resistant glass or the like disposed on the upper surface of the main body 2.

  The pan can be cooked by being placed on the placement portion 6 drawn on the plate 3. 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 13 for heating a pan under each mounting part 6 on both sides of the plate 3 is each installed.

  The placement center 6c is a place where it is difficult to reach the position of the cook. For this reason, when the cooking pan is placed on the placement unit right 6a and the placement unit left 6b in the foreground, if the hand is extended to the placement unit center 6c, the placement unit right 6a and the placement unit left 6b It is difficult to perform cooking by moving the hand at the placing portion center 6c due to steam generated during cooking from the cooking pan placed. Accordingly, the type of cooking performed at the placement portion center 6c is suitable for cooking that does not require the chef to move much, mainly cooking such as stew or heat retention. In addition, since the heating power is low and the maximum power consumption is limited, the heating power of the heating coil 13c installed in the mounting portion center 6c is transferred to the mounting portion right 6a and the mounting portion left 6b. It is set to be weaker than the heating coil right 13a and the heating coil left 13b that are installed correspondingly and to reduce power consumption.

  A heating coil 13 and an inverter board, which will be described later, are provided inside the main body 2, and an intake port 7 for sucking air from the outside of the main body 2 is provided to cool these.

  The air sucked through the air inlet 7 cools the heating coil 13 and the inverter board that generate heat inside the main body 2, and then is discharged out of the main body 2 from the exhaust port 8 as shown by the flow 16 of the cooling air. Further, waste heat of the roaster 4 described later is also discharged from the exhaust port 8 at the same time.

  The roaster 4 is for baking fish, pizza, etc., and is arranged on the left or right side of the front surface of the main body 2. In the present embodiment, it is arranged on the left side toward the front surface of the main body 2. Further, since it is not dedicated to grilled fish, the roaster 4 may be called a grill or an oven.

  Next, the heating coil unit 25 will be described. The heating coil unit 25 includes a heating coil 13, a coil base 24, and ferrite (not shown). The heating coil unit 25 is disposed below the plate 3 of each placement unit 6 so that a certain gap is opened between the plate 3 and the heating coil 13. Cooling air is passed through this gap to protect the heating coil 13 and the like from the heating coil 13 that generates heat and the heat from the heated pan.

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

  Each heating coil unit 25 is disposed below each placement unit 6, the heating coil unit right 25 a is below the placement unit right 6 a, and the heating coil unit left 25 b is below the placement unit left 6 b, A heating coil unit center 25c is provided below the placement unit center 6c.

  Temperature detection of the pan such as automatic cooking is performed by a temperature detection element A21 and a temperature detection element B22 which are temperature detection elements 20 installed in the heating coil unit 25. The temperature detecting element 20 is pressed against the plate 3 to detect the temperature of the pan bottom, and indirectly detects the temperature of the pan bottom via the plate 3. The temperature detection element A21 is installed between the coils of the respective heating coils 13 on the heating coil unit right 25a and the heating coil unit left 25b, and the temperature detection element B22 is arranged on the heating coil unit right 25a, the heating coil unit left 25b, and the heating coil unit center 25c. Are installed in the center of each of the heating coils 13. Some pans have a floating bottom center, and therefore, two temperature detecting elements 20 are provided on the heating coil unit right 25a and the heating coil unit left 25b having a large heating power.

  Circuits such as an inverter circuit 18 for exciting the heating coil 13 and a control means 19 for controlling the output to the heating means 23 in accordance with the temperature detected by the temperature detection element 20 are accommodated in the substrate case 15.

  The upper surface operation unit 9 inputs the heating power of the heating coil right 13a on the placement unit right 6a side and the upper operation unit left 9b for inputting the heating power of the heating coil left 13b on the mounting unit left 6b side. And an upper surface operation portion center 9c for inputting the heating power of the heating coil 13c on the placement portion center 6c side.

  The upper surface display unit 10 is arranged as an upper surface display unit right 10a, an upper surface display unit left 10b, and an upper surface display unit center 10c corresponding to each operation unit of the upper surface operation unit 9, and displays the contents input by each operation unit.

  Next, FIG. 5 is an explanatory diagram showing the upper surface operation unit right 9a and the upper surface display unit right 10a. The display means 17, the thermal power setting means 31, and the menu setting means 34 will be described in detail using the upper surface operation unit right 9a and the upper surface display unit right 10a.

  Since the contents related to the present invention are the same for the upper surface operation unit right 9a and the upper surface display unit right 10a, the upper surface operation unit left 9b and the upper surface display unit left 10b, the upper surface operation unit center 9c and the upper surface display unit center 10c, the upper surface operation unit left 9b and the upper surface The description of the display unit left 10b, the upper surface operation unit center 9c, and the upper surface display unit center 10c side is omitted.

  The upper surface display portion right 10a is divided into a display 41a and a display 41b. The display 41a displays the thermal power input by the thermal power setting means 31, the menu input by the menu setting means 34, and the like. The display 41b is “pre-heating” so that when the temperature of the pan or frying pan reaches an appropriate temperature by using the menu input by the menu setting means 34, the temperature of the pan or frying pan reaches an appropriate temperature. Display “appropriate temperature”.

  The lamps 35 to 40 are composed of LEDs or the like, and the lamp 35 is lit when a turn-off / start key 30 described later is pressed and a heating start is input. The lamps 36 to 39 are lit by the thermal power set by the thermal power setting means 31 described later. Further, the lamps 36 to 39 are simultaneously flashed and notified to prompt the user to set the heating power by automatic cooking which will be described later. The lamp 40 blinks and notifies when the thermal power adjusting means is effective.

  Here, the display 41a, the display 41b, and the lamps 35 to 40 are used as the display means 17.

  The thermal power that can be set by the thermal power setting means 31 is divided into four stages: a “hot fire” key 31a, a “low fire” key 31b, a “medium fire” key 31c, and a “high fire” key 31d, and the necessary thermal power can be input in one operation. In this way, keys are provided individually according to the thermal power. The standard of each thermal power is, for example, when a maximum of 12 stages of thermal power is provided, the relationship between each thermal power and power consumption is equivalent to 100W for "1" stage, equivalent to 200W for "2" stage, 300W for "3" stage, “4” stage is 400 W, “5” stage is 500 W, “6” stage is 800 W, “7” stage is 1.1 kW, “8” stage is 1.4 kW, “9” stage is 1.6 kW, “10” "Is 2 kW," 11 "is 2.5 kW, and" 12 "is 3 kW. The numbers at each stage are the numbers displayed on the display 41a as a guide for the thermal power. In addition, the relationship between the four-stage thermal power display and the 12-stage display is “1” for “slow fire”, “2”, “3”, “4”, “5” for “low fire”, and “6” for “medium fire”. ”,“ 7 ”,“ 8 ”,“ strong fire ”are“ 9 ”,“ 10 ”, which are not provided in the keys of the thermal power setting means 31, but“ 11 ”,“ 12 ”are assigned as“ high power ”. . The thermal power setting means 31 can input directly to the representative thermal power of the four stages of thermal power, the “slow fire” key 31a is “1”, the “low heat” key 31b is “4”, and the “medium fire” key 31c is “7”. ”,“ High fire ”key 31 d can input“ 10 ”firepower.

  When the thermal power adjusting means 32 inputs thermal power that cannot be input by the thermal power setting means 31, for example, thermal power "9", first, the thermal power is input to "7" by the "medium fire" key 31c, and then the thermal power adjustment UP key 32b. When the key is pressed twice, the number indicating the heating power displayed on the display 41a is changed from “7” to “8” and from “8” to “9”, indicating that the heating power is changed to “9”. .

  Incidentally, the thermal power can be lowered from “9” to “8” by pressing the thermal power adjustment DOWN key 32a next time.

  Reference numeral 33 denotes a timer key for selecting a heating time mainly when performing timer cooking such as stew or heat retention.

  The menu setting means 34 is for selecting cooked rice, fried food, boiling water, fried food, etc. for automatic cooking. When the menu setting means 34 is pressed, the menu is displayed on the display 41a. The menu is switched and displayed. This selects the menu to be used.

  Reference numeral 48 denotes a cut / start key for starting and stopping cooking.

  The present embodiment has the above-described configuration. Next, the operation will be described with reference to FIGS. 6 to 8 are display examples of the upper surface operation unit and the upper surface display unit during automatic cooking.

  For example, when a user cooks a fried vegetable, the user places a frying pan on the mounting portion used for heating, and pushes back the menu setting means 34 while viewing the display 41a, and selects “stir fry” from the menu. To do. When the menu is selected, the lamp 35 blinks to notify that the OFF / START key 30 has been activated. When the OFF / START key 30 is pressed, cooking is started, and the lamp 35 is turned on from flashing to indicate that cooking is in progress (preheating). Then, a display indicating that the frying pan is currently being preheated lights up “in preheating” on the display means 41b. The state of the display 41 and the lamps 35 to 40 at this time is shown in FIG.

  When the frying pan is heated and the detected temperature at the bottom of the frying pan approaches the appropriate temperature range, the thermal power is weakened to reduce the overshoot of the frying pan temperature, and the appropriate temperature is notified when the detected temperature of the frying pan reaches the appropriate temperature range. . Specifically, the display of “pre-heating” on the display 41b is redisplayed as “appropriate temperature”, and the fact that the temperature has reached the appropriate temperature is also notified by a buzzer or voice.

  Then, the ingredients to be fried are put in a frying pan, and the four lamps of the lamp 36 to the lamp 39 of the display means 17 are blinked simultaneously so that the heating power is inputted by the heating power setting means 31 and a prompting action is performed. The lamp 35 is turned off. The state of the display 41 and the lamps 35 to 40 at this time is shown in FIG.

  Here, using FIG. 9 and FIG. 10, the relationship between the thermal power control during preheating until the proper temperature of the “stir fried food”, the actual pan temperature, and the detected temperature by the temperature detecting element will be described. In FIG. 9A, the solid line indicates the actual pan temperature, and the broken line indicates the detected temperature detected by the temperature detecting element 20. Moreover, FIG.9 (b) shows the thermal power given to a pan by a heating coil. As shown in FIG. 9 (b), first, heating is performed with a low heating power, and heating is performed with a high heating power after a predetermined time has elapsed, so that the difference between the detected temperature and the pan temperature is reduced as shown in FIG. 9 (a). Since the temperature can be reduced, the optimum temperature can be notified at the timing when the detected temperature reaches the appropriate temperature, and the optimum temperature can be notified when the pan temperature is the appropriate temperature. In FIG. 9B, heating is performed at 0.3 kW (first low heating power) for 30 seconds, heating is performed at 0.2 kW (second low heating power) for 180 seconds, and the detected temperature is an appropriate temperature (210 ° C. It was heated at 1.4 kW (high heating power) until it approached ~ 230 ° C, and was heated at 1.0 kW until the detected temperature reached an appropriate temperature in order to suppress overshooting of the pan temperature, and the detected temperature became an appropriate temperature. The following shows an example of maintaining the temperature at 0.3 kW. However, if the difference between the detected temperature and the pan temperature can be reduced, as shown in FIG. 10 (b), the temperature is 0.2 to 0.3 kW. Heating may be performed for 180 to 210 seconds, heating at 1.4 kW until the detected temperature reaches an appropriate temperature, and maintaining the temperature at 0.3 kW after the detected temperature reaches an appropriate temperature.

  In addition, after supplying electric power to the heating coil, when the temperature rise cannot be detected by the temperature detection element 20 for a predetermined time, the pan bottom is deformed so that the pan is not placed or the temperature cannot be detected even if the pan is placed. Therefore, the power supply to the heating coil may be stopped to ensure safety.

  Next, when “high fire” is input by the heating power setting means 31, the lamp 39 is turned on and the lamp 35 blinks to instruct to input the off / start key. At this time, the “appropriate temperature” display displayed on the display 41b is extinguished, and the thermal power stage “10” input on the display 41a is displayed. When turning off / start is input, the lamp 35 is turned on, and the heating of the frying pan is started at a heating power of 2 kW of the stage “10”. Thereafter, the ingredients are put in a frying pan and cooking is started. In the description, the food material is input after the thermal power is input by the thermal power setting unit 31, but the thermal power may be input by the thermal power setting unit 31 after the food material is input first. However, since the heating power at that time is a state in which heating is controlled with the minimum heating power for maintaining the temperature of the frying pan, the temperature of the frying pan is drastically lowered when ingredients are put therein. Ideally, the ingredients can be fried better if the input of the thermal power is completed and the thermal power of the frying pan is set to a desired setting and then the ingredients are added.

  In addition, when the preheating is over and the ingredients are not prepared by the proper temperature, or when the ingredients are put into the frying pan after the optimum temperature and the cooking power is absorbed and you forget to input the thermal power from the thermal power setting means 31, Heating is controlled with a minimum of heat so as to maintain the temperature at an appropriate temperature, and heating of the frying pan is finished after a certain time.

  If the above-described heating control is used, a pan having an unfavorable shape (for example, a pan with a warped central portion or a pan with a concave bottom portion) or an unfavorable position (for example, a normal position) Even when a small-diameter pan is placed at a position that deviates significantly from the temperature), the difference between the pre-heating pan temperature and the detected temperature can be reduced, so even if the thermistor is used to detect the pan temperature The proper temperature can be notified at an appropriate timing.

It is a block diagram which shows operation | movement of an induction heating cooking appliance. It is a perspective view of the state which stored the built-in type induction heating cooking appliance in the system kitchen. It is explanatory drawing which shows the upper surface of an induction heating cooking appliance. It is explanatory drawing which removed the plate of the induction heating cooking appliance. It is explanatory drawing which shows the upper surface operation part right and the upper surface display part right. It is explanatory drawing which shows the state of the upper surface operation part right and the upper surface display part right during preheating with a stir-fried thing. It is explanatory drawing which shows the state of the upper surface operation part right of a fried food, and the upper surface display part right. It is a figure which shows the relationship between a pan temperature, detection temperature, and a thermal power when heating the pan | bottom-shaped pan | pouring which is not preferable by the conventional thermal power control. It is a figure which shows the relationship between a pan temperature, detection temperature, and a thermal power when heating the pan | pouring of an unpreferable pan bottom shape by the thermal power control of the Example of this invention. It is a figure which shows the relationship between a pan temperature, detection temperature, and a thermal power when heating the pot of an unpreferable pan bottom shape by the thermal power control of the other Example of this invention.

Explanation of symbols

3 Plate 9 Upper surface operation unit 10 Upper surface display unit 13 Heating coil 19 Control unit 20 Temperature detection element 31 Thermal power setting unit 34 Menu setting unit

Claims (3)

A plate on which the pan is placed;
A heating coil unit comprising a heating coil for heating the pan and a coil base for fixing the heating coil from below;
A temperature detecting element disposed in the heating coil unit for detecting the temperature of the pan on the plate;
An inverter circuit for supplying power to the heating coil;
A menu selection means for selecting a menu to be used from a plurality of automatic menus incorporated in advance;
When preheating is performed until an appropriate temperature according to the menu selected by the menu selection means is performed, after performing a low thermal power heating for a predetermined period, a high thermal power heating is performed until the temperature detected by the temperature detecting element reaches an appropriate temperature. Control means for controlling the inverter circuit to perform
An induction heating cooker comprising: A plate on which the pan is placed;
A heating coil unit comprising a heating coil for heating the pan and a coil base for fixing the heating coil from below;
A temperature detecting element disposed in the heating coil unit for detecting the temperature of the pan on the plate;
An inverter circuit for supplying power to the heating coil;
A menu selection means for selecting a menu to be used from a plurality of automatic menus incorporated in advance;
When preheating until reaching an appropriate temperature according to the menu selected by the menu selection means, after heating for a predetermined time with the first low thermal power, a second low thermal power lower than the first low thermal power And a control means for controlling the inverter circuit so as to perform high heating heating until the temperature detected by the temperature detection element reaches an appropriate temperature.
An induction heating cooker comprising: A plate on which the pan is placed;
A heating coil unit comprising a heating coil for heating the pan and a coil base for fixing the heating coil from below;
A temperature detecting element disposed in the heating coil unit for detecting the temperature of the pan on the plate;
An inverter circuit for supplying power to the heating coil;
A menu selection means for selecting a menu to be used from a plurality of automatic menus incorporated in advance;
When preheating is performed until an appropriate temperature is obtained according to the menu selected by the menu selection means, the temperature detected by the temperature detection element is increased after heating at 0.2 to 0.3 kW for 180 to 210 seconds. Control means for controlling the inverter circuit to heat at 1.4 kW until 210-230 ° C;
An induction heating cooker comprising:

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