JP4830658B2 - Cooker - Google Patents

Description

  The present invention relates to a cooking device having an induction heating means using an infrared sensor that is used by being incorporated in a cabinet such as a kitchen.

In the conventional induction heating cooker, as shown in FIG. 7, an infrared sensor 35 is disposed at the center of the heating coil 33, and infrared rays and infrared rays emitted from the bottom surface of the pan 31 placed on the top plate 36 are received. The output of the inverter circuit 34 was controlled from the temperature calculation means for calculating the bottom surface temperature of the pan 31 according to the output from the infrared sensor 35. An infrared transmitting material 32 is disposed above the infrared sensor 35 so that only infrared rays emitted from the pan 31 are guided to the infrared sensor 35, and infrared rays from the bottom of the pan are irradiated on the light receiving surface to accurately measure the temperature of the pan. (For example, refer to Patent Document 1).
JP 2003-317920 A

  However, in the conventional configuration, the detection level is reduced when a pan having a low thermal emissivity is used for an infrared sensor that detects temperature by absorbing incident radiation. It had the subject of becoming difficult to rub.

  Moreover, since the heating output cannot be increased to prevent ignition in fried food cooking, the rise time of the oil temperature is long, and control is performed by adding a plurality of thermistors.

The present invention is intended to solve the problems of the prior art, overtemperature fried mode with the possibility of ignition by frying which to be able to detect accurately the radiation incident from the object to be heated, or use a One oil prevention control and to provide a cooking device that allows to carry out an infrared sensor.

In order to solve the conventional problems, the cooking device of the present invention includes an attached pan, a top plate for placing the attached pan on the top of the main body, a heating coil for induction heating the attached pan , and the heating coil. to an inverter circuit for supplying a high-frequency current, provided in the heating coil downwards, and an infrared sensor for detecting infrared rays emitted from the accessory pan, a thermistor for controlling the adjustment of the oil temperature in the fry mode, the infrared e Bei and heating control means based on an output of the sensor by controlling the high frequency current of the heating coil to control the heating power of said accessory pan, the infrared sensor when the accessory pan placed in at least a predetermined position There was a black part of the bottom surface to emit infrared radiation received, said heating control means in the fry mode, the detected temperature of the infrared sensor is an oil temperature control temperature By performing the overheat prevention control of the accessory pan exceeds a higher preset set temperature can be detected accurately radiation increases the emissivity of the pot.

Also, as overtemperature protection an infrared sensor to a thermistor for performing control such as full Ajii, it is possible to perform the detection by setting a high control temperature, to improve the use for users of safety be able to.

The first invention includes an attached pan, a top plate for placing the attached pan on the top of the main body, a heating coil for induction heating the attached pan , an inverter circuit for supplying a high frequency current to the heating coil, provided to the heating coil downwards, and an infrared sensor for detecting infrared rays emitted from the accessory pan, a thermistor for controlling the adjustment of the oil temperature in the fry mode, the high frequency of the heating coil based on an output of the infrared sensor e Bei and heating control means for controlling the current controlling the heating power of said accessory pan, the accessory pot the bottom portion of which emits infrared radiation the infrared sensor light when placed in at least a predetermined position and black, the heating control means Oite the fry mode, when the detected temperature of the infrared sensor exceeds a set high set point temperature than the control temperature of the oil temperature Serial and performs overheat prevention control that comes with the pot.

  Thereby, since the emissivity of the pan can be increased, the detection level of the infrared rays emitted from the pan can be set with high accuracy with respect to the infrared sensor, and high-precision detection can be performed. Since the temperature in the vicinity of the portion where the temperature rises most at the bottom of the pan can be measured with the infrared sensor, the safety of the user can be improved.

Further , even in the oil cooking fried food mode that may ignite, it is possible to perform the overtemperature prevention control with high accuracy by the infrared sensor, and the safety of the user can be improved.

In the second aspect of the invention, particularly in the first aspect of the invention, the attached pan is blackened on the entire surface on the side contacting the bottom top plate.

  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.

  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)
Embodiment 1 of the present invention will be described with reference to FIGS.

  1 to 6 show a plan view of a heating cooker according to the first embodiment of the present invention, a partially enlarged view, and temperature characteristics of an infrared sensor (in the drawings, the same components have the same numbers). ).

  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. Further, the accessory pan 18 achieves a black body level with high emissivity by painting a part of the outer surface portion (particularly directly 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 of the present embodiment has a configuration using a sensor that detects a temperature higher than the control temperature of normal cooking such as fried foods and fried foods and outputs a detection signal.

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

  First, the heating of the attached pan 18 of the cooking device is started by the fried food key of the operation unit 17. In the present embodiment, fried food cooking is used, but normal heating cooking has the same effect. It is assumed that the control of fuzzy and the like for controlling the temperature adjustment of the oil temperature is performed by a thermistor (not shown) during frying. 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. It is decreasing.

As described above, in the present embodiment, as shown in FIG. 5, even when the attached pan 21, which has all of the pan bottom grounding surface with respect to the top plate 3 painted black, deviates from a predetermined arrangement position, the painted radiation is black. Since the infrared sensor 19 can receive the radiation from the bottom of the pan with a high rate and can detect the temperature appropriately, it informs the user of a pan shift with little temperature rise of the pan and prompts the user to correct it, or by adjusting the pan shift Appropriate heating control such as prevention of overheating can be performed from temperature information from radiation.

  In addition, thermistors are used to control the temperature of fuzzy etc., but by using the infrared sensor 19 as a function to prevent overheating, the detected temperature is set to a higher set temperature, so that Can detect the ignition of oil by a single element of the infrared sensor 19 so that it can be controlled without increasing the temperature detection thermistor unnecessarily, and high safety due to low cost and high accuracy can be ensured.

  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 part is on the infrared sensor 19, infrared radiation emitted from the outer surface of the pan close to the black body can be detected at a high level, and appropriate temperature control or pan deviation and empty pan detection should be possible. Can do.

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 control overheating prevention in a fried food mode having a possibility of ignition. and pans deviation detection than Ru can to be done with high precision, can be applied to the cooker or the like embedded to temperature control by an induction heating load.

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

Claims (3)

And accessory pan, a top plate for placing the accessory pot body top surface, and a heating coil for induction heating said accessory pan, an inverter circuit for supplying a high-frequency current to the heating coil, provided in the heating coil downwards , An infrared sensor for detecting infrared radiation radiated from the attached pan, a thermistor for controlling oil temperature adjustment in the deep-fried food mode, and a high-frequency current of the heating coil based on an output of the infrared sensor and a heating control means for controlling the heating power of the accessory pan, the accessory pot the bottom portion of which emits infrared radiation the infrared sensor light when placed in at least a predetermined position and black, the heating control means in said fry mode, the detected temperature of the infrared sensor of the accessory pot exceeds set high set point temperature than the control temperature of the oil temperature rise Cooking device that performs cut-control. The cooking device according to claim 1, wherein the attached pan is black-coated on the entire surface in contact with the bottom top plate. The cooking device according to claim 1 or 2 , wherein the outer surface of the attached pan is all black.

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