JP4421392B2 - Cooker - Google Patents

Description

  The present invention relates to a heating cooker that heats a cooked appliance placed on a heating portion of a top plate by a heating means.

For example, Patent Document 1 discloses the following cooking device. When the cooking mode selected by the user is the tempura mode, when heating is started, the temperature of the pan is detected and controlled so as to reach the temperature set by the user (that is, the heating temperature of the oil). If the user's set temperature is, for example, 160 degrees, 180 degrees, 200 degrees, etc., the LEDs for displaying the respective temperatures are turned on.
Japanese Patent Laid-Open No. 11-2412

  By the way, there exist some which are equipped with the automatic cooking mode which controls heating cooking automatically according to the cooking type selected by the user in a cooking device. However, when the heating cooker is executing the automatic cooking mode, there is a problem that the user cannot clearly grasp the progress of the cooking. Therefore, it is desirable to give the cooking device a function of clearly displaying the progress status.

This invention is made | formed in view of the said situation, The objective is to provide the heating cooker which can display the progress of the heating cooking which the user has selected and performed.

In order to achieve the above object, the cooking device of the present invention constitutes the top surface of the cooking device body, and a top plate on which the cooked utensil is placed on the heating unit;
Heating means for heating the cooking utensil placed on the heating unit;
Operation means for performing setting operation for cooking,
Heating control means for controlling the heating means based on the setting operation;
Display means for displaying the cooking setting state and the set cooking progress status in the operation means by a display pattern;
Display control means for controlling the display in the display means ,
The heating means is constituted by a heating coil for induction heating,
The display means comprises a fluorescent display tube disposed below the top plate,
The magnetic metal member constituting the fluorescent display tube is disposed so as to be positioned below a high permeability body disposed below the heating coil .

According to the present invention, the user will be able to grasp the progress of the cooking running. Therefore, for example, even when the user performs other work in parallel with cooking by the heating cooker, cooking can be reliably performed without failure.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 10 is an external perspective view showing a state where the cooking device 2 is incorporated in the kitchen cabinet 1. FIG. 11 is a plan view of the main part shown with the top plate removed. A main body 3 of the heating cooker 2 is stored in a storage unit 4 provided in the cabinet 1. A roaster portion 5 is provided on the left portion of the main body 3, and an operation portion 6 is provided on the right portion. The operation section (operation means) 6 is provided with a plurality of switches 7.

  An upper heating unit 10 as shown in FIG. 11 is provided on the upper portion of the main body 3. The upper heating unit 10 has a left heating coil 12 and a right heating coil 13 for induction heating arranged in the left and right sides in a rectangular box-shaped upper case 11 whose upper surface is open, and is positioned on the rear side of the central portion. For example, a central heater 14 made of a radiant heater is arranged, and a top plate 15 made of heat-resistant glass is provided on the upper surface opening so as to cover the coils 12 and 13 and the heater 14 from above.

  On the top plate 15, circular heating units 16, 17 and 18 are respectively displayed above the left and right heating coils 12 and 13 and the central heater 14. The left and right heating coils 12 and 13 are induction-heated based on being energized and controlled while the cooking container P is placed on the heating units 16 and 17, and the central heater 14 is The cooking container P is heated based on being energized and controlled while the cooking container P is placed on the heating unit 18.

  In the front part of the upper case 11, thermal power display units 20 and 21 each having a large number of LEDs (light emitting diodes) 19 are provided in front of the left and right heating coils 12 and 13, respectively, Located between the coils 12 and 13, a high-temperature caution display unit 22 having an LED 19 and a fluorescent display tube (display unit) 23 which is one of the display units are provided. Therefore, the thermal power display units 20 and 21, the high temperature display unit 22, and the fluorescent display tube 23 are disposed below the top plate 15. Each thermal power display part 20 and 21 is arrange | positioned so that the outer periphery of the corresponding heating part 16 and 17 may be followed substantially. In this case, the top plate 15 has a translucent structure by sputtering a thin film of metal such as titanium on the back surface (lower surface) of a substantially transparent crystallized glass, and has a spectral transmission characteristic in the visible light region. is doing.

  FIG. 1 shows a specific display example of the fluorescent display tube 23. FIG. 1 shows a state where all the display parts are lit. The display contents of the fluorescent display tube 23 include a use state display unit 24 (L, R, M) indicating the use state of the left and right heating coils 12 and 13 and the central heater 14, a hot water display unit 25, a fried food display unit 26, The tempura display unit 27, the rice cooking display unit 28, the roaster display unit 29, and the thermal power display unit 30 (shared with the roaster and the central heater) are provided. In this case, red and blue are used as display colors of the display units 24 to 30.

  In addition, when displaying using the fluorescent display tube 23 in the heating cooker 2, there are the following merits. That is, since the anode of the fluorescent display tube 23 emits light, the viewing angle is wider and the brightness is higher than that of the liquid crystal display. Therefore, even while cooking or looking at the operation unit 6 (from the viewpoint of the user) Display visibility is good). Further, since the top plate 15 is made translucent, only the display portion where the fluorescent display tube 23 is lit can be visually recognized by the user. Therefore, it is excellent in design and display contents are easy to understand.

Further, the fluorescent display tube 23 can emit a color (purple: 400 nm to red: 700 nm) corresponding to substantially the entire visible light band according to the phosphor material constituting the anode. Therefore, by giving the top plate 15 a spectral transmission characteristic that is translucent in the visible light region, it is possible to perform display in multiple colors. In addition, the fluorescent display tube 23 has several times better blue and green luminance than the red one due to the luminous efficiency of the phosphor. Therefore, if the top plate 15 is set so that the spectral transmittance of about 700 nm corresponding to red is larger than the spectral transmittance of about 500 nm corresponding to blue and green , the luminance of each color can be made substantially uniform. it can.

Further, a control circuit 78 (see FIG. 14) having a microcomputer is provided in the operation unit 6. The control circuit 78 is based on the operation signal of the switch 7 of the operation unit 6, the detection signal of the temperature sensor, and the control program prepared in advance, and the left and right heating coils 12, 13, the central heater 14, and the roaster 5. While controlling a heater (not shown) etc., it has the function to control the said thermal-power display parts 20 and 21, the high temperature caution display part 22, and the fluorescent display tube 23. FIG.
In the above configuration, the thermal power display units 20 and 21 display the degree of thermal power of the corresponding heating coils 12 and 13 according to the number of the LEDs 19 that are turned on. The high temperature caution display unit 22 is turned on when the temperature detected by the temperature sensor is higher than the set temperature.

  FIG. 12 is a longitudinal front view in the vicinity of the top plate 15. On the lower surface side of the heating units 16 and 17, temperature detection units 40 </ b> L and 40 </ b> R are arranged at the center of the heating coils 12 and 13. Further, the heating coils 12 and 13 are arranged in a state of being placed on the support bases 33 and 34, and a ferrite (high magnetic permeability) formed in a rod shape is provided below the support bases 33 and 34. A plurality of bodies) 35 and 36 are arranged radially.

  The fluorescent display tube 23 positioned between the left and right heating coils 12 and 13 is supported so as to be sandwiched from the left and right by left and right support members 38 and 39 that are erected and fixed to the printed circuit board 37. ing. The lead pins 23a, the grid 23c, the sealing lid (not shown), etc. that constitute the fluorescent display tube 23 are made of a magnetic metal material such as iron, nickel, and chrome alloy. In the vertical direction, the upper end position of the magnetic metal material is arranged below the upper surfaces of the ferrites 35 and 36. Reference numeral 23 d denotes a display surface glass of the fluorescent display tube 23.

The induction heating coils 12 and 13 are composed of two large and small unit coils 12 (B, S) and 13 (B, S) arranged concentrically. The large-diameter unit coils (hereinafter referred to as large coils) 12B and 13B are spaced apart from the small-diameter unit coils (hereinafter referred to as small coils) 12S and 13S.
In addition, three temperature detectors 40 to 42 are arranged on the lower surface of the top plate 15 above the induction heating coils 12 and 13, respectively. One temperature detection unit 38 among the temperature detection units 40 to 42 is located at the center of the small coils 12S and 13S, and the remaining two temperature detection units 39 and 40 are the center of the small coils 12S and 13S. And is located between the large coils 12B and 13B and the small coils 12S and 13S.

FIG. 13 is a longitudinal sectional side view in the vicinity of the top plate 15 in the depth direction. Three temperature detectors 40 to 42 are disposed on the lower surface of the top plate 15 above the induction heating coils 12 and 13, respectively. One temperature detection unit 40 among the temperature detection units 40 to 42 is located at the center of the small coils 12S and 13S, and the remaining two temperature detection units 41 and 42 are connected to the center of the small coils 12S and 13S. It is on a straight line extending in the front-rear direction and is located between the large coils 12B and 13B and the small coils 12S and 13S.
Each of the temperature detection units 40 to 42 is configured by accommodating a temperature detection element (for example, a thermistor) in a ceramic case mainly composed of aluminum nitride, and the surface of the case is the top plate 15. It arrange | positions so that it may contact | adhere to the back surface.

  FIG. 14 shows the overall electrical configuration. In FIG. 14, a DC power supply circuit 45 includes a rectifying stack 47 for full-wave rectifying the output of the AC power supply 46 and a smoothing capacitor 48 for smoothing the rectified output. The half-bridge type inverter circuit 49 fed from the DC power supply circuit 45 constitutes the heating means referred to in the present invention together with the heating coil 12 (or 13).

  The inverter circuit 49 is connected in parallel with the smoothing capacitor 48 to connect a series circuit of the IGBTs 50 and 51 and a series circuit of the resonance capacitors 52 and 53, and to a common connection point of the IGBTs 50 and 51 and the capacitors 52 and 53. The heating coil 12 is connected so as to form a series resonance circuit with the connection point. In addition, a flywheel diode (no symbol) is connected between each collector and emitter of the IGBTs 50 and 51, respectively.

  The inverter voltage phase detection circuit 54 detects the inverter voltage Viv output from the output terminal of the inverter circuit 49 (common connection point of the IGBTs 50 and 51), and outputs the detected inverter voltage Viv to the phase comparison circuit 55. The capacitor voltage phase detection circuit 56 detects the voltage at the common connection point of the capacitors 52 and 53, that is, the capacitor voltage Vc that correlates in phase with the inverter current flowing through the capacitors 52 and 53, and uses the detected voltage Vc. Output to the phase comparison circuit 55.

  The phase comparison circuit 55 outputs a phase difference signal Vp1 indicating the phase difference of each input signal by comparing the phases of the inverter voltage Viv and the capacitor voltage Vc. The phase difference signal Vp1 is sent to the difference comparison circuit 57. Given. The phase difference setting circuit 58 is configured to output a variably set phase difference setting voltage Vset as an input power adjustment signal for determining input power, and the phase difference setting voltage Vset is supplied to the difference comparison circuit 57. Given.

  The difference comparison circuit 57 compares the phase difference signal Vp1 output from the phase comparison circuit 55 with the phase difference setting voltage Vset variably set in the phase difference setting circuit 58, and the comparison result is a binary signal. Vp2 is output to a voltage controlled oscillator (hereinafter referred to as VCO) 59. That is, the difference comparison circuit 57 increases Vp2 if Vp1> Vset, and decreases Vp2 if Vp1 ≦ Vset.

The VCO 59 is frequency control means for controlling the oscillation frequency of the inverter circuit 49 so that the phase difference between the inverter voltage Viv and the capacitor voltage Vc becomes a phase difference variably set by the phase difference setting circuit 58. The oscillation frequency is changed according to the output signal from the circuit 57.
Note that the VCO as a general analog circuit has an oscillation frequency that changes according to the input voltage. The VCO 59 here is a circuit that digitally simulates the circuit operation. The oscillation frequency is changed according to the comparison result given.

  The drive circuit 60 alternately turns on and off the IGBTs 50 and 51 based on the signal from the VCO 59. When the IGBTs 50 and 51 are alternately turned on and off in this manner, the heating coil 2 and one of the capacitors 52 and 53 alternately exhibit a series resonance state, whereby the heating coil 12 generates high-frequency power and the top plate The cooking container P placed on 15 is induction-heated.

  The initial circuit 61 is a means for initially setting the phase difference between the inverter voltage Viv phase-correlated with the output voltage of the inverter circuit 49 and the capacitor voltage Vc phase-correlated with the output current of the inverter circuit 49, When the power is turned on, an initial signal is given to the phase difference setting circuit 58. In this case, when the initial signal is given, the phase difference setting circuit 58 outputs a phase difference setting voltage Vset such that the phase difference between the inverter voltage Viv and the capacitor voltage Vc becomes a reference phase difference. It has become. Thereby, the input power is set to be a predetermined initial setting power (for example, about 100 W when the cooking container P placed on the top plate 15 is an iron pan).

  The current transformer CT (1) is provided in a state in which a current path between the AC power supply 46 and the DC power supply circuit 45 is a primary conductor in order to detect an input current Iin from the AC power supply 46. The input current detection circuit 62 outputs a current detection signal having a voltage level corresponding to the input current Iin based on the secondary side output of the current transformer CT (1). The current detection signal is used as a load state detection circuit. 63 and also supplied to the electric energy detector 67 via the A / D converter 66a.

  The load state detection circuit 63 detects whether or not the object to be heated (the cooking container P) placed on the top plate 15 is an appropriate load based on the current detection signal from the input current detection circuit 62. That is, the load state detection circuit 63 sets threshold values Is1 and Is2 (Is1 <Is2) having a predetermined width for determining the load state, and these threshold values Is1 and Is2 and the input current are set. The value of the input current Iin detected by the detection circuit 22 is compared.

  Specifically, when the value of the input current Iin is lower than the threshold value Is1, the load state detection circuit 63 is prepared by cooking the object to be heated placed on the top plate 15 from iron or nonmagnetic stainless steel. It is determined that it is a container P. Further, when the value of the input current Iin is between the threshold value Is1 and the threshold value Is2, it is determined that the object to be heated placed on the top plate 15 is the cooking container P made of aluminum. Further, when the value of the input current Iin is larger than the threshold value Is2, it is determined that there is no load, and a detection signal is output.

The timer circuit 64 is set to a predetermined timer time, for example, 3 seconds. When the detection signal from the load state detection circuit 63 is input, the timer circuit 64 executes the load detection operation again by operating the initial circuit 61 after 3 seconds. .
On the other hand, a current transformer CT (2) is provided between the common connection point of the IGBTs 50 and 51 (the output terminal of the inverter circuit 49) and the heating coil 2 with the current path between them as a primary conductor. The inverter current detection circuit 65 outputs a current detection signal having a voltage level corresponding to the inverter current based on the secondary side output of the current transformer CT (2). The current detection signal is converted into an A / D converter 66b. The maximum value of the inverter current is limited by applying the phase difference setting circuit 58 after converting the signal into a digital value signal. The power supply voltage detection circuit 68 detects the voltage of the AC power supply 46, converts the power supply voltage detection signal into a digital value signal by the A / D conversion unit 66b, and then a power amount detection unit (power amount detection means) 67. To give.

  The power amount detection unit 67 integrates the input power by temporally integrating the input current, and gives the integrated power value to the heated object detection unit 69. The power amount detection unit 67 is configured to calculate input power on the assumption that the power supply voltage is constant. When the power supply voltage fluctuates, a power supply voltage signal given from the power supply voltage detection circuit 68 is used. In consideration of the above, the input power is calculated.

  The voltage signal generation circuit 70 converts a resistance value change of the temperature detection element included in the temperature detection units 40 to 42 (only the temperature detection unit 40 is shown in FIG. 12) into a voltage signal having a level corresponding to the detected temperature and outputs the voltage signal. The voltage signal is converted into a digital value signal by the A / D conversion unit 71 and given to the heated object temperature determination unit 72. Actually, the voltage signal generation circuit 70 multiplexes and receives the detection signals output from the three temperature detection units 40 to 42, respectively. The heated object temperature determination unit 72 generates a temperature signal indicating the actual detected temperature (temperature of the heated object) by the temperature detection element based on the voltage signal from the A / D conversion unit 71, and the temperature A signal is given to the to-be-heated object detection part 69 and the thermal power setting part 73 mentioned later.

In the heated object determination reference storage unit 74, the correlation between the integrated power value by the electric energy detection unit 67 and the detected temperature by the temperature detection units 40 to 42 (the output of the heated object temperature determination unit 72) is related to the heated object. Is stored as determination reference value information to be described later, and the determination reference value information is given to the heated object detection unit 69.
The heated object detection unit 69 uses the determination reference value information stored in the heated object determination reference storage unit 74, the integrated power value from the power amount detection unit 67, and the temperature signal from the heated object temperature determination unit 72. Based on the comparison result, information about the object to be heated (type of cooking operation (eg, cooking in a pot whose heating object is water, cooking of a fried food whose heating object is oil), the type and weight of the cooking container P, cooking For obtaining and outputting the warp of the bottom of the container P, the amount of cooked food, etc.).

  The operation unit 6 is provided to perform operations such as setting cooking conditions such as heating output (input power) and cooking time, setting a cooking mode that can be selected from a plurality of types, and starting and stopping cooking. In addition to such operation functions, the set heating output, cooking time, display of the cooking mode, a function for displaying whether or not the cooking operation is being performed, and a heating output control means 76 to be described later. Thus, the function of displaying this when the actual heating output is changed is set.

  In this case, as the heating cooking mode, in addition to the normal heating mode in which cooking is started with a constant heating output, for example, a fried food cooking mode, a tempura (fried food) cooking mode, a rice cooking mode, and a water heating mode are set. The operation unit 6 has key switches (for example, “stir fry key”, “tempura key”, “rice key”, “water heater” for selecting each mode of fried food cooking, tempura cooking, rice cooking, and water boiling. A key “)” is provided on the operation unit 6, and a start key and a stop key for starting and stopping heating cooking, an operation dial for setting heating output and cooking time, and the like are also provided. Further, in the “rice cooking mode”, the amount of rice cooked, that is, the total number of rice to be cooked is input and set as the amount of cooking. Note that the normal heating mode is automatically selected when the start key is operated.

  The heating output control means 76 includes the heating power setting unit 73 and a heating power comparison circuit 77 that receives the output of the heating power setting unit 73. Among these, the thermal power setting unit 73 receives the output from the heated object detection unit 69 and the set output by the operation unit 6 as output control information, and outputs the output control information and the temperature signal from the heated object temperature determination unit 72. Based on this, the heating output control by the heating coils 12 and 13 and the display control of the display units 20 to 23 are performed.

  Specifically, the thermal power setting unit 73 feeds back the setting output from the operation unit 6 (heating output according to the set cooking conditions and heating cooking mode) with the temperature signal from the heated object temperature determination unit 72 being fed back. The setting heating output has a function of changing the set heating output based on information about the heated object acquired by the heated object detection unit 69, and further displays the changed set heating output on the display unit 20. The function to display in -22 is provided.

  In this case, the thermal power setting unit 73 stores a plurality of types of heating output control patterns corresponding to the temperature detected by the temperature detection element 42, and the plurality of types of heating according to the set output from the heated object detection unit 69. One of the output control patterns is selected. In addition, the thermal power comparison circuit 77 includes the heating output control pattern selected by the thermal power setting unit 73, the current detection signal and the power supplied from the input current detection circuit 62 and the power supply voltage detection circuit 68 through the A / D conversion units 66a and 66b. The actual input power indicated by the voltage signal is compared, and the comparison output is given to the phase difference setting circuit 58. The phase difference setting circuit 58 that has received such a comparison output controls the input power to be the selected heating output control pattern by outputting the phase difference setting voltage Vset corresponding to the comparison output.

  In this embodiment, the phase comparison circuit 55, the difference comparison circuit 57, the phase difference setting circuit 58, the VCO 59, the initial circuit 61, the load state detection circuit 63, the timer circuit 24, and the A / D conversion units 66a, 66b and 71 Inverter output control circuit (heating control means, display control means) by the electric energy detection part 67, the heated object detection part 69, the heated object temperature determination part 72, the heated object determination reference storage part 74, and the heating output control means 76 78, the inverter output control circuit 78 is composed of a microcomputer (RISC microcomputer) having a RISC architecture CPU core. 14 is the same as that shown in Japanese Patent Application No. 2003-11416.

  Next, the operation of the present embodiment will be described with reference to FIGS. FIG. 4 is a flowchart showing the contents of control of a portion according to the gist of the present invention by an inverter output control circuit (hereinafter simply referred to as a control circuit) 78. First, when the user selects which of the three heating units 16 to 18 to use (step A01), the control circuit 78 lights the corresponding usage state display unit 24 (step A02). For example, when the heating unit 16 is selected, the display unit 24L is turned on.

  Next, when the cooking mode is selected by the user (step A1), the control circuit 78 determines whether or not the automatic cooking mode is selected (step A2). When the automatic cooking mode is selected (“YES”), a display corresponding to the progress of the selected automatic cooking is performed (step A3), and heating control is performed according to the selected automatic cooking (step A3). A4). Then, the process returns to step A2 until cooking is completed (step A5, “NO”).

  On the other hand, in step A2, if the user's selection is not the automatic cooking mode ("NO"), it is determined whether or not the cooking mode is "stir fry" (step A7). When using a cooked utensil such as a frying pan for a stir-fry, the cooking utensil itself is often heated in advance to some extent and then "preheating" is performed so as to start cooking at a high temperature. Therefore, it is determined whether the “preheating” is performed by the user.

  That is, when the cooking mode is “stir fry” (step A2, “YES”), it is determined whether or not the heating power setting is “medium heat” (step A8). “NO”) It is determined that there is no intention to perform “preheating”, and the display portions 26a and 26b indicating that the fried food display portion 26 is ready to cook the fried food are turned on (step A9, FIG. 2). reference). Then, the process proceeds to step A4.

Further, when the heating power setting is “medium fire” in step A8 (“YES”), it is determined to be “preheating”. Therefore, the “preheating” display portion 26c is turned on and the frying pan portion is displayed in the stir-fried food display portion 26. Only the display part 26a is turned on (step A10). Then, the temperature is detected by the temperature detectors 40 to 42, and when the preheat set temperature is reached (step A11, “YES”), the “preheat” display portion 26c is turned off (step A12) and the process proceeds to step A9. . FIG. 2 shows the temperature rise state when the cooking mode is “stir fried food” and the temperature reaches an appropriate temperature for performing the fried food through preheating, and the display changes according to the temperature change.
Further, if “NO” is determined in step A7, it is determined that the cooking mode selected by the user is the heating mode. Therefore, in this case, display according to the set thermal power is performed, and the process proceeds to step A4.

FIG. 5 is a flowchart showing the processing contents of the cooking progress display in step A3, and an example is shown in which “tempura mode” is selected as the automatic cooking mode. FIG. 3 shows the temperature change of the pan when the “tempura mode” is executed, and the corresponding display change state. The tempura display unit 27 includes a symbol display unit 27a indicating the “tempura mode”, and preheating display units 27 b to 27 d (in FIG. 5, for displaying a preheating period in which the oil is heated to an appropriate temperature). and shown as a pattern P1 to P3), it is composed of a suitable temperature display unit 27 e to indicate that it has reached an appropriate temperature. And these display parts 27a-27e are arrange | positioned integrally in parallel.

First, the control circuit 78 turns on the symbol display portion 27a corresponding to the “tempura mode”. Then, the temperatures detected by the three temperature detectors 40 to 42 are referred to and their maximum values are obtained (step B1). Next, the electric energy detection part 67 detects the electric power consumption accompanying heat cooking (step B2).
In subsequent step B3, it is determined whether or not the maximum value of the temperature detected in step B1 is equal to or higher than T1, and if the temperature is lower than T1 (“NO”), whether the electric energy detected in step B2 is equal to or higher than W1. It is determined whether or not (step B4). Then, unless the amount of power W1 or more ( "NO"), the control circuit 78 blinks the preheating display section 27 b (step B5).

On the other hand, when the temperature is equal to or higher than T1 in Step B3 (“YES”) and when the electric energy is equal to or higher than W1 (“YES”) in Step B4, the control circuit 78 displays the preheating display unit 27b . It is continuously lit (ON), and flashes the preheating display section 27 c preheated to display that it has advanced one step (step B6). After execution of steps B5 and B6, the process proceeds to step B7.
That is, the temperature rise degree of the object to be heated is inversely proportional to the heat capacity, and is proportional to the input heat amount (calories) for heating the object to be heated. Therefore, displaying the progress of cooking based on the input power amount enables accurate display.

In subsequent steps B7 and B8, as in steps B3 and B4, the control circuit 78 determines whether or not the temperature is equal to or higher than T2 (> T1) and the electric energy is equal to or higher than W2 (> W1). If it is determined as "YES" at either step, the control circuit 78, the preheating display section 27b, 27c cause the continuously lit, thereby and blinks the preheating display section 27 d (step B9). If it is determined “NO” in any step, the following steps B10 to B12 are executed.

Steps B10 and B11 determine whether the temperature is equal to or higher than T3 (> T2) and whether the electric energy is equal to or higher than W3 (> W2), similarly to Steps B7 and B8. If it is determined as "YES" at either step, the control circuit 78, the preheating display section 27b, 27c, and 27 d with to continuous lighting, lights the display portion 27 e for displaying "suitable temperature" (step B12). Also, if “NO” is determined in any step, the process returns.

  As a result of executing the control as described above, the display state transitions in the manner shown in FIG. In the “rice cooking mode” shown in FIG. 6 and the “water heater mode” shown in FIG. 7, the basic display control is the same as the flow shown in FIG. 5, and the temperature threshold value set for each automatic cooking mode. In other words, the display mode is changed stepwise according to the cooking progress.

For example, in the “rice cooking mode” of FIG. 6, the display patterns P1 to P3 are changed in the same manner as the “tempura mode” in accordance with the progress of the process “Hitashi”, “cooking”, and “steaming”. In the “steaming” process, “Murashi” is lit and displayed. When the process ends, “Murashi” is turned off and “cooking” is lit and displayed. In the “water heating mode” of FIG. 7, during “heating” until the hot water temperature reaches 100 degrees, a symbol indicating bubbles is displayed inside the symbol of the medicine can, and when the hot water temperature reaches 100 degrees, ”Is performed, but at that stage, the symbol indicating the bubble is turned off and“ Heat retention ”is turned on.

  As described above, if the cooking progress status is displayed for each automatic cooking mode, the user can grasp the progress status at a glance by referring to the display of the fluorescent display tube 23. Therefore, for example, it is possible to use it as a guideline for the time when the seasoning or the like is added, or when preparing or preparing the next cooking, which is convenient for performing the cooking work.

  FIG. 8 shows the relationship between the input power change and the display control temperature threshold value and the electric energy threshold value in the case of the “tempura mode”, the “stir fry mode” or the “hot water mode”. Is. However, the threshold value is set in three stages according to the “tempura mode”, but differs depending on the mode. The temperature threshold values T1 to T3 for switching the display correspond to the electric energy threshold values W1 to W3. Further, P1, P2, and P3 on the horizontal axis indicate display units that are to be blinked in accordance with changes in the progress status in FIG. Further, FIG. 9 is a view corresponding to FIG. 8 in the “rice cooking mode”.

  As described above, according to the present embodiment, the control circuit 78 includes the fluorescent display tube 23 that displays the cooking setting state in the operation unit 6 and the set cooking progress, and the control circuit 78 outputs the output signals of the temperature detection units 40 to 42. The automatic cooking function that automatically controls the heating output of the heating coils 12 and 13 is provided, a plurality of cooking modes including the automatic cooking function can be set by the operation unit 6, and the fluorescent display tube 23 is connected to the top plate 15. In addition, the cooking mode and the cooking progress of the cooking mode can be integrally displayed.

Therefore, since it becomes easy for the user to intuitively recognize the progress of the cooking that is being performed, for example, even when other operations are performed in parallel with cooking by the heating cooker, cooking fails. It is possible to perform without fail.
For example, in the technique disclosed in Patent Document 1, it is determined whether the set temperature has been reached by detecting the temperature of the pan, but the progress of cooking is displayed based on the detected temperature. It is possible. For example, the temperature increasing process is displayed by blinking an LED indicating the set temperature and changing the blinking cycle. Specifically, when the temperature of the pan is lower than the set temperature, the flashing cycle is lengthened, the flashing cycle is shortened as the temperature approaches the set temperature, and the LED is continuously turned on when the set temperature is reached. .
However, such control based on temperature detection has the following problems. For example, when the bottom of the pan is along a concave portion when viewed from the outer bottom side, the pan bottom is not in close contact with the top plate of the cooking device, so temperature detection cannot be performed with high accuracy. As a result, the display accuracy of the progress status is not always accurate.
Moreover, in cooking using a frying pan etc., since the heat capacity of a to-be-cooked object is comparatively small, temperature rises rapidly. On the other hand, since the heat capacity on the top plate side is large, the followability of the temperature sensor is very poor. Accordingly, there is a problem that the temperature detection cannot be performed with high accuracy in cooking with a small heat capacity, and the display accuracy of the progress status is deteriorated as described above.
On the other hand, according to the present embodiment , the control circuit 78 performs display control of the progress based on the amount of power input in accordance with the progress of cooking by heating detected by the power amount detection unit 67. Display can be performed with high accuracy. In particular, display accuracy can be improved for cooking with a small heat capacity. Therefore, the user can grasp the progress of the cooking being performed with high accuracy. For example, even when the cooking by the heating cooker 2 and other work are performed in parallel, the cooking can be performed without fail. It becomes possible to carry out.

  In addition, the control circuit 78 refers to the temperatures detected by the temperature detectors 40 to 42 and performs display control of the progress status. That is, when cooking is performed in a state where the pan bottom is flat and the heat capacity is relatively large with a pan that is in close contact with the top plate 15, the influence of the heat capacity of the top plate 15 is reduced. Even if display control is performed based on the detected temperature, it is possible to perform display with high accuracy. Therefore, the display accuracy can be further improved by performing the display control by detecting the temperature together with the electric energy. Also, three temperature detectors 22 are arranged for each heating unit 16 or 17 and the maximum temperature detected by them is obtained, so that it is not affected by the shape and size of the pan bottom, The cooking progress status can be displayed with high accuracy.

  Moreover, according to the present Example, in the operation part 6, the rice cooking amount in "rice cooking mode" can be input-set. Therefore, since the heat capacity of the object to be cooked in the “rice cooking mode” can be grasped based on the input rice cooking amount, the cooking progress display system can be further improved by taking the heat capacity into consideration. When the “stir fry mode” is selected, it is possible to estimate the heat capacity such that the heat capacity of the cooked food is usually small and the heat capacity of a frying pan is large. Therefore, based on such estimation, the cooking progress display system can be improved.

  Then, the fluorescent display tube 23 performs a transition from “preheating” to “appropriate temperature” in the “stir fry mode”. In other words, when frying with a frying pan or the like, generally, after preheating the frying pan, add oil, stir-fry with vegetables and so on, but since the heat capacity is small in the preheating state, the frying pan is preheated too much There is a case. If the pan is preheated too much, the temperature will rise when oil is added. Therefore, it is possible to clearly notify the user that the preheating has been completed by displaying the “appropriate temperature”, and to prompt the start of fried food cooking at an appropriate timing.

  Furthermore, in the “stir fry mode”, the “preheating” display is performed when the heating power setting is “medium heat”. That is, when the thermal power setting is “high fire (ie, high thermal power)”, the temperature rise degree of the frying pan or the like becomes high. Therefore, if the user tries to add oil after confirming the “appropriate temperature” display, The temperature will rise. Therefore, in the case of such a thermal power setting, the “preheat” display is not performed, but the “appropriate temperature” display is performed from the beginning, so that an excessive temperature rise such as a frying pan can be suppressed.

The present invention is not limited to the embodiments described above and illustrated in the drawings, and the following modifications are possible.
In the flowchart shown in FIG. 5, it is not always necessary to detect the temperature in the progress display control.
One, two, or four or more temperature detection sensors may be arranged per one heating unit. Further, when there are a plurality of temperature detection sensors, for example, an average of their detection temperatures may be taken. Furthermore, in that case, only some of the detected temperatures may be averaged.

The display units 24L, 24R, and 24M corresponding to the heating units 12 to 14 may be provided as necessary.
In addition, when there are a plurality of heating units and there is a margin in the display area, a display unit for displaying the cooking mode and its progress status is provided for each of the plurality of heating units. May be.

The display unit is not limited to the one using the fluorescent display tube 23, and a liquid crystal display or an EL (Electro Luminescence) display may be used, or a display using an LED as a light source may be used.
The cooking device does not need to include a device that performs induction heating, and may be any device that performs cooking by some heating means.
If it is assumed that the voltage is constant, the power amount detection means may detect power equivalently by detecting only the current amount and integrating the current amount.

In addition, as the cooking amount, for example, the amount of water in the “water heating mode” may be input and set.
The preheating display function in the “stir fry” mode may be performed based only on the detected temperature regardless of the thermal power setting.
What is necessary is just to implement suitably selecting what is required according to each design about the display of each cooking mode and its cooking progress.

The figure which is one Example of this invention, and shows the specific example of a display of the fluorescent display tube arrange | positioned at a heating cooker The figure which shows the temperature change of the pan at the time of executing the "stir fry mode" and the change state of the corresponding display Fig. 2 equivalent when "tempura mode" is executed The flowchart which shows the control content of the part concerning the summary of this invention by an inverter output control circuit The flowchart which shows the processing content of the cooking progress display in step A3 of FIG. Figure 2 equivalent when "rice cooking mode" is executed Figure corresponding to Fig. 2 when "water heating mode" is executed The figure which shows the relationship between the input electric power change in the case of "tempura / stir-fried food / kettle mode", and the temperature threshold value and electric energy threshold value for display control Figure 8 equivalent figure about "cooking rice mode" External perspective view showing a state where a cooking device is incorporated in a kitchen cabinet The top view of the principal part shown in the state which removed the top plate of the heating cooker Longitudinal front view near the top plate Depth longitudinal side view near the top plate Diagram showing overall electrical configuration

Explanation of symbols

In the drawings, 2 is a heating cooker, 6 is an operation section (operation means), 12 and 13 are heating coils, 15 is a top plate, 16 to 18 are heating sections, 23 is a fluorescent display tube (display means), and 24 to 30 Is a display unit, 40 to 42 are temperature detection units, 67 is a power detection unit (power detection unit), and 78 is an inverter control circuit (heating control unit, display control unit).

Claims (7)

A top plate that constitutes the upper surface of the cooker body and on which the cooked utensil is placed in the heating unit;
Heating means for heating the cooking utensil placed on the heating unit;
Operation means for performing setting operation for cooking,
Heating control means for controlling the heating means based on the setting operation;
Display means for displaying the cooking setting state and the set cooking progress status in the operation means by a display pattern;
Display control means for controlling the display in the display means ,
The heating means is constituted by a heating coil for induction heating,
The display means comprises a fluorescent display tube disposed below the top plate,
A heating cooker characterized in that the magnetic metal member constituting the fluorescent display tube is disposed below a high permeability body disposed below the heating coil . The operation means can set a plurality of cooking modes,
The cooking device according to claim 1, wherein the display unit is configured to be able to integrally display the selected cooking mode and the cooking progress of the cooking mode in parallel. Comprising an electric energy detection means for detecting an input electric energy to the heating means,
The display control means controls to display the cooking progress so as to advance in accordance with an increase in the input power amount detected by the power amount detection means. Or the heating cooker of 2. A temperature detection sensor disposed on the lower surface side of the heating unit;
The cooking device according to claim 3, wherein the display control means displays the progress of the cooking so as to advance in accordance with an increase in the temperature detected by the temperature detection sensor. A plurality of the heating unit and heating means are provided,
The display means includes a plurality of display units corresponding to the plurality of heating units, and is configured to display a display unit corresponding to the heating unit selected for cooking by heating. The heating cooker according to any one of claims 1 to 4, wherein A plurality of the heating unit and heating means are provided,
The display means includes a plurality of display units corresponding to the plurality of heating units, and displays the one corresponding to the heating unit selected to perform cooking by heating among the plurality of display units, and the cooking mode. The cooking device according to any one of claims 1 to 4, characterized in that a display unit for displaying the progress status pattern is shared.   The cooking device according to any one of claims 1 to 6, wherein the display means is configured to display a preheating state of the cooked utensil.

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