JP2008117727A - Heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately adjust temperature that varies depending on unevenness of pan curvature or unevenness of a top plate curvature for placing a heated material. <P>SOLUTION: Since detection is carried out by an infrared rays sensor 19 that receives radiation rays from a pan bottom of an attached pan 21 coated in black and having a high rate of heat absorption, the heat adjustment can be carried out irrespective of the unevenness of the pan curvature or unevenness of the curvature of the top plate 3 for placing the heated material. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cooking device using an infrared sensor that is used in a cabinet such as a kitchen.

Conventionally, as shown in FIG. 7, this type of heating cooker includes a top plate 31 for placing an object to be heated on the top surface of a main body 30, a heating coil 32 for inductively heating the object to be heated, and a heating coil. An inverter circuit 33 that supplies a high frequency current to 32, and a temperature detection thermistor 34 in the center of the heating coil 32, and heat conduction from the bottom surface of the pan 35 placed on the top plate 31, and the heat conduction The output of the inverter circuit 33 was controlled from the temperature calculation means for calculating the bottom surface temperature of the pan 35 according to the received output from the thermistor 34 (see, for example, Patent Document 1).
JP 2001-307863 A

  However, in the above-described conventional configuration, temperature detection is performed by a thermistor in fried food cooking, so fine adjustment of temperature and oil due to variations in the warping of the pan bottom or the warping of the top plate for placing the object to be heated. Since it is difficult to detect the amount with high accuracy and the heating output cannot be increased to prevent ignition, the oil temperature rise time is long, and control is performed by adding multiple thermistors. It had the problem of going up.

  The present invention solves the above-described conventional problems, and in order to accurately detect infrared radiation incident from a heated object in deep-fried food cooking, variations in pan warping or warping of the top plate for placing the heated object. The temperature adjustment that changes due to the variation of the temperature is highly accurate, and even when the object to be heated is shifted, it can be detected with high accuracy, and it can be detected only with an infrared sensor, including control to prevent overheating of oil that has the possibility of ignition. An object of the present invention is to provide a heating cooker that can be performed at low cost without adding a plurality of thermistors.

  In order to solve the conventional problems, a heating cooker according to the present invention includes a top plate for placing an object to be heated on a top surface of a main body, a heating coil for heating the object to be heated, and a high-frequency current in the heating coil. An inverter circuit for supplying an electric current, an infrared sensor provided below the heating coil for detecting infrared rays emitted from the object to be heated, and a high-frequency current of the heating coil based on an output of the infrared sensor to control the object to be heated In the configuration provided with a heating control means for controlling the amount of heating power, the heated object is an attached pan in which at least a part of the bottom surface is painted black, in a fried food mode in which the temperature is adjusted manually and cooking is performed. By performing temperature adjustment control of the object to be heated by the infrared sensor, it is possible to accurately detect incident radiation regardless of variations in pan warpage.

  The heating cooker of this invention can detect the radiation which injects into an infrared sensor accurately because the heat absorption rate of a pan becomes high.

  A first invention includes a top plate for placing a heated object on a top surface of a main body, a heating coil for induction heating the heated object, an inverter circuit for supplying a high-frequency current to the heating coil, and a lower part of the heating coil An infrared sensor for detecting infrared rays radiated from the object to be heated, and heating control for controlling a heating power amount of the object to be heated by controlling a high-frequency current of the heating coil based on an output of the infrared sensor Means for controlling the temperature of the object to be heated by the infrared sensor in a fried food mode in which cooking is performed by adjusting the temperature by manual operation. Is to do.

  As a result, temperature detection during cooking of fried food can be detected with infrared rays emitted from the pan, so detection is not affected by variations in the warpage of the pan or the warpage of the top plate for placing the object to be heated. In addition, since the incident radiation is incident on the infrared sensor in a state where the emissivity of the pan is increased, more accurate temperature detection and highly accurate temperature control based on the detected temperature can be performed. it can.

  In the second aspect of the invention, particularly in the first aspect of the invention, the pan bottom grounding surface for the top plate is painted black.

  Thereby, even if the pan position is shifted, the radiation from the pan can be easily detected, so that the pan shift can be detected with high accuracy, and cooking performance and safety can be improved.

  In the third invention, in particular, in the first or second invention, the entire outer surface of the attached pan is made black.

  As a result, even if the infrared sensor part is exposed from the grounding surface of the pan bottom by shifting the pan position, if the flange part of the pan end is on the infrared sensor, it is radiated from the outer surface of the pan near the black body. The infrared detection level can be detected at a high level, and appropriate temperature control or pan deviation detection can be set.

  In a fourth aspect of the invention, in particular, in any one of the first to third aspects of the invention, an overheat prevention control is performed by an infrared sensor.

  Thereby, since the temperature of the part vicinity where the temperature rises most at the time of heating can be measured with high accuracy by the infrared sensor, the safety of the user can be improved.

  According to a fifth aspect of the invention, in particular, in any one of the first to fourth aspects of the invention, a thermistor is provided for heating control, and the temperature of the overheat prevention control of the infrared sensor for the thermistor is set high.

  This makes it possible to perform overheating prevention control of fried food cooking that has the possibility of ignition due to the use of oil only with an infrared sensor using infrared temperature characteristics, so it is possible to detect overheating with high accuracy, In addition, a thermistor as a function to prevent overheating can be eliminated.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIGS. 1-6 shows the top view of the heating cooker in the 1st Embodiment of this invention, the partial enlarged view, and the temperature characteristic of an infrared sensor.

  In FIG. 1, the cooker main body 1 is dropped into the work top 2 of the kitchen cabinet and incorporated. The upper surface of the main body 1 is covered with a plate frame 4 surrounding the top plate 3 made of crystallized glass. Further, as shown in the figure, the top plate 3 is provided with induction heating portions 5a and 5b and electric resistance heating type heating means 6 (hereinafter, referred to as a "radiant heater portion 6"), and within the members constituting the top plate 3 In the front part, induction heating operation parts 7 and 8 and a radial operation part 9 corresponding to the induction heating parts 5a and 5b and the radial heater part 6 are arranged. The operation units 7, 8, and 9 are capacitance detection type touch keys that react to changes in the electric capacity by touching the electrode part printed on the top plate 3, and the top surface has no irregularities, so that it can be maintained. The flat contact type is easy to handle. Note that the operation unit of the present embodiment is not limited to the capacitance detection type, and the same effect can be obtained with a push button type operation unit such as a tact type. The central heating means is not limited to the radiant heater section 6 and may be induction heating type heating means. Also, on the side surface of the main body 1, there are disposed a grill portion 10 disposed inside the left side of the main body 1 and a grill operation portion 11 capable of storing a tact switch for operating the grill portion 10. In addition, the operation part of the radial heater part 6 distribute | arranged to a top | upper surface center part shall not be limited to the operation part 9, but may be put together in the grill operation part 11.

  Inside the main body corresponding to the induction heating parts 5a and 5b and the radial heater part 6, a heating coil constituting the induction heating means and a radial heater which is an electric resistance heating type heating means are arranged behind the heating coil. . An energization control circuit (not shown), which is a power supply circuit for the heating coil, is arranged below the heating coil, and a cooling fan (not shown) is provided at a position below the operation circuit unit in front of the circuit unit (not shown). ) And an intake port (not shown) is provided in the depth of the main body 1 below.

  In addition, as shown in FIG. 2, the operation unit corresponding to the induction heating units 5a and 5b includes, for example, a heating on / off key 7a for energizing the left heating unit, a fried food key 7e for fried food cooking, A heating power up key 7b and a heating power down key 7c for adjusting the heating power of the heating unit, a timer time setting key for setting cooking time, an auto cooking key, and the like are arranged. The display unit 7d displays an input state, a timer time, a set heating power, a set temperature, and the like by an LCD or LED. Similarly, the operation keys are arranged in the right induction heating and radial heater section and the grill operation section. The notification means comprises a speaker, an amplifier and sound information that can notify a user of a buzzer or sound for notifying the user of the state of the cooking device. Moreover, the control means of the heating cooker in this Embodiment is implement | achieved using a microcomputer.

  As shown in FIG. 3, the temperature detection means includes an infrared sensor 19 in the vicinity of the center of the heating coil 16, and the infrared sensor 19 detects radiation incident from the attached pan 18 that is an object to be heated. Moreover, the accessory pan 18 achieves a black body level with a high heat absorption rate by painting a part of the outer surface portion (particularly just above the infrared sensor 19).

  Further, the infrared sensor 19 is disposed in the vicinity of the center of the heating coil 16 so as to be less affected by the magnetic flux from the heating coil 16. In addition, the light guide unit 20 is disposed from the vicinity of the light receiving surface of the infrared sensor 19 to the upper surface of the heating coil 16 so as not to be affected by infrared radiation from the peripheral components of the infrared sensor 19 such as the heating coil 16.

  FIG. 4 shows an example of the characteristics of the infrared sensor. The horizontal axis is the temperature of the object to be heated, and the vertical axis is the voltage output of the infrared sensor. The infrared sensor 19 according to the present embodiment is configured to use a sensor that detects a control temperature for normal cooking of fried food and outputs a detection signal. For example, when the fried food temperature adjustment range is adjusted from 140 ° C. to 200 ° C. in increments of 10 ° C., the infrared sensor output 140 ° C. to 200 ° C. output in the characteristics shown in the figure is calculated and detected.

  The operation and action of the induction heating cooker configured as described above will be described below with reference to FIGS.

  First, heating of the attached pan 18 of the heating cooker is started by the fried food key 7e of the operation unit 11. When heating is started, the inverter circuit 23 supplies a high frequency current to the heating coil 16, and the attached pan 18 self-heats from the magnetic flux from the heating coil 16. Radiation from the attached pan 18 that has generated heat is detected by the infrared sensor 19, and the detected output is converted into temperature by a temperature calculating means (not shown). When the temperature exceeds the set temperature, the control means outputs the output of the inverter circuit 23. The temperature is adjusted by raising the output of the inverter circuit 23 again when the temperature falls below the set temperature.

  As described above, in the present embodiment, as shown in FIG. 5, the infrared sensor 19 directly receives radiation from the pan bottom having a high heat absorption rate of the attached pan 21 in which the pan bottom grounding surface with respect to the top plate 3 is painted black. Even when there is a variation in the amount of warping of the bottom surface of the attached pan 21, or even when there is a variation in the warping of the top plate 3, an appropriate temperature can be detected, and an appropriate temperature can be determined based on the temperature detection described above. Control can be performed.

  Moreover, even when the attached pan 21 with the pan-bottom grounding surface with respect to the top plate 3 painted black is deviated from the predetermined arrangement position, the infrared sensor 19 receives radiation from the pan bottom having a high heat absorption rate, and an appropriate temperature. Because detection can be performed, it is possible to notify the user that the temperature rise of the pan due to pan deviation is small and prompt correction, or to prevent overheating or to detect empty pan from the temperature information from the radiation for pan deviation It can be.

  Moreover, even if 19 parts of infrared sensors are exposed from the grounding surface of the pan bottom by shifting the pan position by painting black over the entire outer surface of the attached pan 22 as shown in FIG. If the portion is on the infrared sensor 19, the infrared ray radiated from the outer surface of the pan close to the black body can be detected at a high level, and the pan shift and the empty pan can be detected.

  Further, in combination with the deep-fried food temperature adjustment function, the overheat prevention function is detected only by the infrared sensor 19 using infrared temperature characteristics. The infrared sensor of FIG. 4 detects the ignition of oil by stopping the heating at a higher set temperature, for example, the above-described temperature adjustment range of the frying oil temperature of 140 ° C. to 200 ° C. at 250 ° C. Since it can be performed at a single element, it can be controlled without increasing the thermistor for preventing overheating unnecessarily, temperature adjustment and overtemperature prevention can be realized at low cost, and high safety is ensured with high accuracy. Can do.

  Also, when a thermistor is used for heating control and the thermistor and the infrared sensor 19 are used for temperature adjustment, the infrared sensor 19 is used as a function to prevent overheating, and the detected temperature is set to a higher set temperature than the thermistor. By doing so, the ignition detection of oil can be similarly performed with high accuracy by the infrared sensor 19, so that high safety can be ensured.

  As described above, the heating cooker according to the present invention can detect infrared rays radiated from an object to be heated close to a black body with an infrared sensor with high accuracy, and can control temperature control and overheating in a fried food mode that has the possibility of ignition. Ascending prevention control and pan shift detection can be performed with high accuracy regardless of variations in pan warp, and can be realized at low cost without using multiple thermistors. It can also be applied to a type of cooking device.

The top view of the heating cooker in Embodiment 1 of this invention The elements on larger scale of the heating cooker in Embodiment 1 of this invention Configuration schematic diagram of heating cooker in Embodiment 1 of the present invention Infrared sensor temperature characteristic diagram of heating cooker in Embodiment 1 of the present invention Configuration schematic diagram of heating cooker in Embodiment 1 of the present invention Configuration schematic diagram of heating cooker in Embodiment 1 of the present invention Configuration diagram of heating cooker in the conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,15 Main body 3 Top plate 16 Heating coil 18, 21, 22 Attached pan 19 Infrared sensor 23 Inverter circuit

Claims (5)

A top plate for placing the object to be heated on the top surface of the main body, a heating coil for inductively heating the object to be heated, an inverter circuit for supplying a high-frequency current to the heating coil, and the heating coil provided below the heating coil An infrared sensor for detecting an infrared ray emitted from an object, and a heating control means for controlling a heating power amount of the object to be heated by controlling a high-frequency current of the heating coil based on an output of the infrared sensor, A cooking device for controlling the temperature of the heated object with the infrared sensor in the fried food mode in which the object to be heated is an attached pan with at least a part of the bottom surface painted in black, and the temperature is adjusted manually for cooking. The cooking device according to claim 1, wherein the pan bottom grounding surface with respect to the top plate is painted black. The cooking device according to claim 1 or 2, wherein the outer surface of the attached pan is all black. The cooking device according to any one of claims 1 to 3, wherein overheat prevention control is performed with an infrared sensor. The heating cooker of any one of Claims 1-4 which provided the thermistor in heating control and set the temperature of the overheat prevention control of an infrared sensor high with respect to the thermistor.

Images