JP5675535B2 - Induction heating cooker - Google Patents

Description

  The present invention relates to an induction heating cooker.

  In a conventional induction heating cooker, it is common to continue energization as it blows down. When heating is continued with the water blown down, the boiled juice that has flowed to the top plate along the outer circumference of the pan will scorch due to the heat of the pan, or the water in the pan will continue to decrease and the food in the pan will be burnt. There was a case.

  Therefore, as shown in Patent Document 1, recently, a sensor for detecting a change in capacitance is provided under the top plate, and a blow-off is detected by a change in the capacitance of the sensor to stop heating, An induction heating cooker that has a function of lowering the temperature has come out.

JP 2010-170855 A

  In the induction heating cooker described in Patent Document 1, it is possible to detect blown down, but a configuration for preventing blown down is not disclosed.

  An object of this invention is to provide the induction heating cooking appliance which suppresses blowing down.

The present invention has been made to solve the above problems, a plate provided on the upper surface of the main body for placing a pan, a heating coil provided below the plate and heating the pan over the plate, A temperature detection element provided below the plate for detecting the temperature of the pan through the plate, an inverter circuit for supplying electric power to the heating coil, and controlling the inverter circuit based on the detected temperature of the temperature detection element A control means, and an operation / display unit that is provided on the front side of the plate and that sends an input signal to the control means and that sends a display signal from the control means. to monitor the level of the boiling determination temperature the temperature change corresponding to the temperature of the detected is detected by said temperature detecting element of the pan to the operation and display unit, also during cooking, the operation When receiving an input of a particular of the level from the display unit, in which the detection temperature of said temperature sensing element for controlling the inverter circuit so as to maintain the temperature corresponding to the level.

  In cooking with boiling water or rice cake, where boiling is likely to occur during cooking, it is possible to individually set the boiling judgment temperature according to the pan used for cooking and the amount of water, thereby realizing prevention of blowing down.

It is a perspective view of the state which accommodated the induction heating cooking appliance of one Example in the system kitchen. It is explanatory drawing which shows the upper surface of the induction heating cooking appliance of one Example. It is explanatory drawing which shows the state which removes the plate of the upper surface of the induction heating cooking appliance of one Example, and can see a heating coil. It is sectional drawing which shows the internal structure seen from the side surface of the induction heating cooking appliance of one Example. It is explanatory drawing which shows the upper surface operation part of the induction heating cooking appliance of one Example. It is a block diagram explaining the heating part of the induction heating cooking appliance of one Example, and its control. It is explanatory drawing which shows the upper surface display part of the induction heating cooking appliance of one Example.

  Hereinafter, the Example of this invention is described using the induction heating cooking appliance of FIGS.

  The cooking device shown in FIG. 1 is a built-in induction heating cooking device in which three pan mounting portions 6a, 6b, and 6c are provided on a plate 3. In the present embodiment, a built-in type that fits into a kitchen will be described as an example, but a stationary heating cooker placed on the kitchen may be used.

  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 later-described roaster (grill) 4 and operation unit panel 5 of the main body 2 of the cooking device can be operated from the front surface of the system kitchen 1.

  A pan (not shown) 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. As shown in FIG. 2, the placement unit 6 has a placement unit right 6 a and a placement unit left 6 b arranged on the front side of the upper surface of the plate 3 on the upper surface of the main body 2, and between these placement units 6 a and 6 b. The placing portion center 6c is disposed on the back side (center rear portion). And the heating coil unit 25 mentioned later for heating a cooking pot below 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 mounting unit right 6a and the mounting unit left 6b in the foreground, if the hand is extended to the mounting unit center 6c, the mounting unit right 6a and the mounting 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 center 13c installed in the mounting portion center 6c is transferred to the mounting portion right 6a and the mounting portion left 6b. The heating coil right 13a and the heating coil left 13b that are installed correspondingly are set to be weaker and consume less power.

  A frame 14 that protects the plate 3 is provided on an end surface of the plate 3. It consists of a frame front 14a attached to the upper upper edge of the front side 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 left 14d attached to the left upper edge. ing. In this example, the frame is divided into 4 pieces, but it can be integrated, 2 pieces or any number of pieces, and it is not necessary to attach it to the 4 sides of the plate 3. Only two sides or only two sides on the left and right sides may be used.

  Inside the main body 2, a heating coil unit 25, which will be described later, which is a heat generating member, and electronic components are provided, and an air inlet 7 for sucking air from the outside of the main body 2 is provided to cool them. The intake port 7 is located on the right side toward an exhaust port 8 to be described later on the rear frame 14 b on the upper surface of the main body 2.

  The air sucked through the air inlet 7 is discharged from the air outlet 8 to the outside of the body 2 after cooling a heating coil unit 25 (described later) and electronic components that generate heat inside the body 2. Further, waste heat of the roaster 4 described later is also discharged from the exhaust port 8 at the same time, and the exhaust port 8 is provided on the side of the roaster 4 on the rear frame 14b on the upper surface of the main body 2.

  Since the roaster 4 is used to bake fish, pizza, etc., it 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 will be described with reference to FIG.

  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). 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. This gap is for allowing cooling air to be described later to flow. A heating coil unit right 25a is provided below the placement portion right 6a, a heating coil unit left 25b is provided below the placement portion left 6b, and a heating coil unit center 25c is provided below the placement portion center 6c. Yes.

  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 means 72 (FIG. 6) 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 in the coil base 24.

  Temperature detection of the pan such as during automatic cooking is performed by a temperature detection element 21 embedded in the heating coil 13. The temperature at the bottom of the pot is indirectly detected via the plate 3. In addition, although the temperature detection element 21 is installed in the heating coil unit right 25a and the heating coil unit 25b in the figure, it is possible to manage the temperature of the heating coil and the boiling by the heating coil unit 25c. It becomes like this.

  Next, an inverter for exciting the heating coil and its cooling will be described with reference to FIG. FIG. 4 is a longitudinal sectional view of the main body 2 of the heating cooker, and a substrate on which an inverter circuit is mounted and heat dissipating fins 22 and 23 for cooling the heat generating elements are described in the lower center portion. A left and right inverter board 18 on which an inverter circuit for driving the left and right heating coils 13a and 13b is mounted is arranged at the bottom, and a central inverter board 17 for driving the heating coil center 13c is arranged on the upper stage. In general, the upper stage is likely to receive the heat of the lower stage, but the heating coil center 13c has a lower maximum heat input than other coils, so the amount of heat generation is small. For this reason, the central inverter board | substrate 17 which drives the heating coil center 13c was distribute | arranged to the upper stage. Further, as shown in FIG. 6, the left and right inverter boards 18 are equipped with electronic components for driving the heating coil right 13a and the heating coil left 13b. The inverter right 72a, the inverter left 72b, and the inverter control means right described later are mounted. 73a and inverter control means left 73b are mounted.

  Returning to FIG. 4, each board is provided with heat radiation fins 22, 23 for efficiently exchanging heat generated by the electronic component with cooling air to lower the temperature of the electronic component. Is smaller than the radiation fin 22.

  As described above, the maximum heating power of each heating coil is set to be smaller in the heating coil center 13c than the heating coil right 13a and the heating coil left 13b. For this reason, the central inverter board 17 (the inverter center 72c described later and the inverter control means center) is set. The power consumption at 73c) is smaller than that of the left and right inverter boards 18 (inverter right 72a and inverter left 72b, inverter control means right 73a and inverter control means left 73b described later). For this reason, the amount of heat generated by the electronic components is also smaller than that of the left and right inverter boards 18, and the radiating fins used for cooling can be reduced. For this reason, the small radiating fins 23 are used for the central inverter board 17 and the large radiating fins 22 are used for the left and right inverter boards 18.

  Each component that generates heat is cooled by the air sent by the blower fan 20. The outside air for cooling sucked from the air inlet 7 flows through the board case 15 for housing the left and right inverter boards 18, the central inverter board 17, and the control board 19, and takes the heat of the radiation fins 22 and 23. The heating coil 13 is cooled and discharged from the exhaust port 8 to the outside.

  The substrate case 15 shown in FIG. 3 is installed below the heating coil unit right 25a in this embodiment, and the substrate is stored in the substrate case 15 to protect the substrate from radiation heat from the heating coil 13 and the roaster 4 during cooking. Further, the substrate case 15 is formed with an air passage (not shown) through which the cooling air passes through the stacked substrates, the heating coil unit 25, and the upper surface display unit 10 so that the cooling air can be efficiently distributed.

  Next, the operation of the heating coil 13 will be described with reference to FIG. The operation of the heating coil 13 is performed by the upper surface operation unit 9 provided on the front frame 14a. The upper surface operation unit right 9a, the upper surface operation unit center 9c, and the upper surface operation unit left 9b are arranged from the right corresponding to the placement unit right 6a, the placement unit center 6c, and the placement unit left 6b. This arrangement is such that the operator can intuitively understand the relationship between the pan and the operation unit. As is apparent from the figure, the upper surface operation unit right 9a and the upper surface operation unit left 9b have the same key arrangement.

  Hereinafter, the operation of the heating coil right 13a will be described on the upper surface operation unit right 9a side as a representative. Reference numeral 48 denotes a cut / start key for starting and stopping cooking.

  The heating power for cooking is selected by the heating power key 49. The keys are divided into four stages: low heat, low heat, medium heat, and high heat, and each key is provided so that the necessary firepower can be set with a single operation. As for the standard of each thermal power, for example, when the thermal power can be adjusted in 12 steps at the maximum, the relationship between each thermal power and power consumption is equivalent to 100 W in the “1” stage, equivalent to 200 W in the “2” stage, and 300 W in the “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, “ The “10” stage is 2 kW, the “11” stage is 2.5 kW, and the “12” stage is 3 kW. The numbers at each stage are numbers that are displayed on the upper surface display unit 10 to be described later as an indication of the thermal power. In addition, the relationship between the thermal power notation and the actual stage display is as follows: “1” for flash fire, “2”, “3”, “4”, “5” for low fire, “6”, “7”, “8” for medium fire. "," 9 "and" 10 "are assigned to the high fire, and" 11 "and" 12 "are assigned to the high power. The fire key 49 can be directly set to a representative fire power of four stages of fire power, the hot key 49a is "1", the low fire key 49b is "4", the medium fire key 49c is "7", and the high fire key 49d is "10". Can be set to no firepower.

  Reference numeral 51 denotes a memory key. This is for setting the level of the boiling judgment temperature described later.

  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 to be described later, and is displayed each time the menu key 52 is pressed. The selected menu is switched, and the menu to be used is selected.

  Also, 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 finishing adjustment for automatic cooking, and set the oil temperature when frying. . The setting key 50 includes an UP key 50a for increasing the quantity at the time of setting and a DOWN key 50b for decreasing the quantity.

  For example, a case where the heating power is adjusted with the setting key 50 will be described. First, the medium fire key 49c is pressed to set the heating power to “7”. Thereafter, when the UP key 50a of the setting key 50 is pressed twice, the number indicating the thermal power displayed on the upper surface display unit 10 to be described later is changed from “7” to “8”, and from “8” to “9”. High fire “9” is set. Since the upper surface operation unit left 9b has the same operation and arrangement as the upper surface operation unit right 9a, the description thereof is 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. The reason for this is as described above. 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 by pressing it up to three times, so each heat power like the two heating coils 25a, 25b in the foreground. There is no thermal power setting key corresponding to. Thereby, the installation space for the key can be secured. In addition, the content of the automatic cooking menu is limited to stew and heat insulation, etc., because the design is limited to the thermal power.

  Next, a display that reflects the result of the above-described operation will be described. The contents corresponding to the key operation of the upper surface operation unit 9 are displayed on the upper surface display unit 10. The contents to be displayed are a heat power display set by the upper surface operation unit 9, a time display for timer cooking, a display of a set oil temperature for fried food, and the like. The upper surface display unit 10 is disposed on the near side of the plate 3 placed on the upper surface of the main body 2 and on the back side of the plate 3. Accordingly, when viewing the display, the display portion is provided through the plate 3, so that the display portion of the upper surface display portion 10 is processed so that the display content can be seen through the plate 3. In addition, the backlight color of the display unit is set so that the set thermal power can be easily understood from the image. In the present embodiment, the flash fire and the low fire are displayed in green, the medium fire is displayed in orange, and the high fire and high power are displayed in red.

  In the present embodiment, the upper surface display unit right 10a, the upper surface display unit center 10c, and the upper surface display unit left 10b are separately provided corresponding to the upper surface operation units 9.

  Next, the upper surface display unit 10 will be described using the upper surface display unit right 10a as an example with reference to FIG. In the display, fried 1015, boiling water 1016, stew 1017, and boil 1018 are menu names selected by pressing the menu key 52 described above. Reference numeral 1014 denotes a setting confirmation display unit, which is a display unit that displays numbers representing thermal power, the time during timer cooking, and the temperature of oil in the deep-fried food. Reference numeral 1012 denotes a high-temperature caution display, which is a display that prompts the user to be aware of burns when the temperature of the mounting unit 6 becomes high due to the temperature of the pan rising due to cooking. Reference numeral 1013 denotes a no pan display, which is a display that is displayed when a pan is not placed due to pan detection when heating is performed without placing the pan on the placing portion 6.

  Next, the control will be briefly described with reference to FIG. The operation / display unit 75 includes the upper surface operation unit 9 and the upper surface display unit 10 described so far. Menus, heating power information, cooking start / off information, etc., input by the operation unit of the operation / display unit 75 are sent as an input signal 80 to the control unit 74 described later, information recognized by the control unit 74, cooking progress, etc. Is sent to the operation / display unit 75 as a display signal 79 and displayed on the upper surface display unit 10.

  The control means 74 controls the heating unit based on the contents set by the operation / display unit 75 and a program such as automatic cooking incorporated in advance. Based on the set contents, cooking start / stop and heating power setting information is sent to an inverter control means 73 or heater control means 82 to be described later via a control signal 78. And temperature information is received by receiving the control signal 78 which carried temperature information from the temperature detection element 21 which detects the temperature provided in the heating part. Although not shown in the block diagram, the blower fan 20 is also controlled, and the blower fan is operated during cooking.

  The inverter control unit 73 monitors and corrects the power setting to the heating coil 13, the start and stop of energization, and the power consumption of the heating coil 13 based on an instruction from the control unit 74. The inverter means 72 is controlled (described later) by sending an inverter control signal 76 to the inverter means 72. As for monitoring and correcting the power consumption of the heating coil 13, the power consumption is calculated from the input current and the input voltage of each heating coil 13 sent by the detection signal 77 from the inverter means 72, which will be described later, and the heating power is a set value. Inverter means 72, which will be described later, is controlled by an inverter control signal 76. The inverter control means 73 and the inverter means 72 are combined to form an inverter circuit.

  The inverter means 72 is means for supplying electric power to the heating coil 13 and supplies power to the heating coil 13 based on an instruction from the inverter control means 73. The inverter means 72 is provided in each heating coil 13 like the inverter control means 73, and is provided with an inverter right 72a, an inverter left 72b, and an inverter means 72c. Then, the input voltage and the input current of each heating coil 13 are detected and sent to the inverter control means 73 on each detection signal 77. The heater control means 82 controls ON / OFF of the heater 81 while monitoring the temperature in the cooking chamber of the roaster 4 based on a signal from the control means 74.

  In the induction heating cooker configured as described above, a test mode, which will be described later, for confirming a pattern to be cooked by the user is incorporated in the control means 74.

  The test mode is to check the boiling temperature that varies depending on the type of pan used and the type and amount of ingredients in the pan, so that a guideline for cooking under the same conditions next time can be obtained. And once you set it in the test mode, when cooking under the same conditions (used pot, ingredients to put in, etc.), you can rest assured to cook “boiled”, “boiled”, “boiled”, etc. Is. In the embodiment, an example is provided in which eight levels are provided so that cooking under a plurality of conditions such as the type of pot and the amount of water can be stored. In order to set the test mode, a dedicated key may be provided, or it may be provided in a plurality of menus and set with the menu keys 52, 60, and 64.

  Next, the setting of the test mode when performing boiling water will be described with reference to FIG. First, when the test mode is set and the water heater 1016 is set from the menu, the water heater 1016 in the menu is turned on and “0” is displayed on the setting confirmation display portion 1014.

  Next, approximately the same amount of water that is usually put in a pan used for boiling water is put on the placement unit right 6a and heating is started.

  When water is heated and the temperature rises, the temperature detected by the temperature sensing element 21 that detects the temperature of the pan gradually rises. And the numerical value of the level which is a specific numerical value displayed on the setting confirmation display part 1014 also rises according to the raise of the detection temperature of the temperature detection element 21. An example of the relationship between the numerical value of the level and the detected temperature of the temperature detecting element 21 will be shown. For example, when the detected temperature of the temperature detecting element 21 is 86 ° C., the numerical value displayed when the detected temperature is 86 ° C. is “1”, when the detected temperature is 88 ° C. the displayed numerical value is “2”, and when the detected temperature is 90 ° C. The numerical value displayed for the level is “3”, the numerical value displayed for the level when the detected temperature is 92 ° C. is “4”, the numerical value displayed for the level when the detected temperature is 94 ° C. is “5”, and the detected temperature is The numerical value displayed when the temperature is 96 ° C. is “6”, the numerical value displayed when the detected temperature is 98 ° C. is “7”, and the numerical value displayed when the detected temperature is 100 ° C. is “8”. It is said.

  Then, when the water in the pot has boiled, the memory key 51 is pressed to input, so that a numerical value of a level that is a specific numerical value when input is input. This value is the boiling judgment temperature.

  And the control means 74 controls the inverter circuit to control the electric power supplied to the heating coil 13a so as to maintain the detected temperature of the temperature detecting element 21 according to the numerical value of the input level, and the temperature of the pot water Shift to heat insulation control that keeps constant.

  If the level when the water in the pan is boiled is “5”, the next time you want to boil the same amount of water in the same pan, enter the boiling judgment temperature (level) as “5” and boil the water. Then, there is no fear that the temperature detection element 21 detects the temperature of 94 ° C. and shifts to the heat retention control, and the water is boiled and blown down.

  The heat retention control controls the electric power applied to the heating coil 13 so that the temperature detected by the temperature detecting element 21 is approximately a temperature corresponding to level 5 (94 ° C.). In addition, when cooking was performed at the level “5” last time, the default setting is stored in a storage device such as an EEPROM so as to be “5”. The trouble of setting the level every time can be saved.

  In case of “boiled”, cooking with boiled noodles with a lot of spilling can be done with confidence by checking the appropriate level even if the level varies depending on the spaghetti and udon menu. Further, the boiling determination temperature may be input directly instead of the level.

  According to the above-described embodiment, the boiling determination temperature corresponding to the pan used in cooking and the amount of water can be individually set, thereby preventing the blow-out.

2 Main body 3 Plate 6 Placement unit 9 Upper surface operation unit 10 Upper surface display unit 13 Heating coil 17 Central inverter substrate 18 Left and right inverter substrate 20 Blower fan 72 Inverter unit 73 Inverter control unit 74 Control unit 75 Operation / display unit

Claims (1)

A plate provided on the upper surface of the main body for placing the pan, a heating coil provided below the plate for heating the pan, and a temperature provided below the plate for detecting the temperature of the pan over the plate A detection element; an inverter circuit for supplying electric power to the heating coil; a control means for controlling the inverter circuit based on a detection temperature of the temperature detection element; and an input signal provided to the control means provided on the front side of the plate, And an operation / display unit to which a display signal is sent from the control means,
In the test mode, the control means heats the pan, detects a temperature change of the pan by the temperature detection element, and displays the level of the boiling determination temperature corresponding to the detected temperature on the operation / display unit. ,
Further, during cooking, upon receiving an input of a specific level from the operation / display unit, the inverter circuit is controlled so that the temperature detected by the temperature detection element maintains the temperature corresponding to the level. Induction heating cooker.