JP2008226750A - Electromagnetic cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic cooker, in which an induction heating coil is arranged below a top plate for mounting a cooking container, capable of improving safety at the time of cooking of a pan-fried food. <P>SOLUTION: In the electromagnetic cooker having the induction heating coil arranged below the top plate for mounting the cooking container, a temperature sensor for sensing temperature of the cooking container and/or temperature of the induction heating coil and arranged between the top plate and induction heating coil, a heating power setting means for setting heating power of the induction heating coil, and control means for controlling the heating power of the induction heating coil on the basis of output of the heating power setting means and temperature sensor, a cooked object determining means for determining a kind of the cooked object stored in the cooking container on the basis of temperature rise slope of the cooking container is arranged in the control means, and control means set up the heating power of the induction heating coil at predetermined heating power when the cooked object determining means determines that the cooked object is a pan-fried food. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the present invention, an induction heating coil is disposed below a top plate on which a cooking container is placed and heated, and the induction heating coil is controlled based on the output of a temperature sensor disposed between the top plate and the induction heating coil. The present invention relates to an electromagnetic cooker that controls thermal power.

  In an electromagnetic cooker that places a cooking container on a top plate and arranges an induction heating coil below the top plate and heats the cooking container with this induction heating coil, for example, as shown in Patent Document 1 In addition, a temperature sensor is arranged between the top plate and the induction heating coil, and the temperature of the cooking container is detected by this temperature sensor and the heating power of the induction heating coil is controlled to control the heating of the cooking container to the set temperature. ing.

Conventionally, the maximum heating power of the electromagnetic cooker is generally 2 KW, but recently, 3 KW is becoming mainstream due to shortening of the cooking time and improvement of the performance of the induction heating coil. And, induction heating is said to have a high safety with no open flame when compared with a gas stove, but tempura oil is known to spontaneously ignite at about 370 to 380 degrees C.
JP 2006-107814 A

  On the other hand, in an electromagnetic cooker, when a small amount (for example, about 10 g) of oil is put in a frying pan and heating is continued with a high heating power (heating power exceeding 2 KW), there is a problem that the oil spontaneously ignites. Moreover, in an electromagnetic cooker, as shown in the above-mentioned Patent Document 1, the temperature of the cooking container is detected by a temperature sensor, and the heating power of the induction heating coil is lowered step by step as the temperature of the cooking container increases. However, when the heating power is set to a high heating power and heating is started, there is a problem that the temperature detected by the temperature sensor is slow with respect to the temperature rise of the cooking vessel, and the tempura oil is spontaneously ignited with a delay in the heating power reduction.

  In the case of spontaneous ignition with the above-mentioned small amount of oil, although the oil burns out and extinguishes spontaneously in about 1 minute to 1 and a half minutes after ignition, spontaneous ignition itself is not preferable.

  Then, this invention aims at improving the safety | security at the time of the fried food cooking which uses tempura oil more.

  The structure of Claim 1 of this invention is the temperature of a cooking vessel arrange | positioned between the top plate which mounts a cooking container, the induction heating coil arrange | positioned under this top plate, and a top plate and an induction heating coil. Or / and a temperature sensor for detecting the temperature of the induction heating coil, a thermal power setting means for setting the thermal power of the induction heating coil, and a control for controlling the thermal power of the induction heating coil based on the output of the thermal power setting means and the temperature sensor, etc. In this embodiment, the control means detects the temperature rising gradient of the cooking container from the output of the temperature sensor, and determines the type of the cooking object stored in the cooking container from the temperature rising gradient. In addition to providing the control means, when the cooking object determination means determines that the food to be cooked is fried, the heating power of the induction heating coil is set in advance regardless of the heating power set by the heating power setting means. Setting It is those formed by the configuration so as to set the force.

  The configuration of claim 2 of the present invention is the upper limit preset for overheating prevention in the configuration of claim 1 when the control means determines that the food to be cooked is a fried food. In this configuration, the temperature is set lower than a preset predetermined temperature.

  In the configuration of claim 3 of the present invention, in the configuration of claim 1, when the control means determines that the food to be cooked is a fried food by the food preparation determination means, the food to be cooked is set stepwise in advance. When the temperature rises to the upper limit set temperature, the upper limit thermal power of the induction heating coil is set to the upper limit set thermal power set in advance corresponding to each upper limit set temperature, and these upper limit set thermal powers can be set by the thermal power setting means. It is configured by setting.

  According to a fourth aspect of the present invention, in the configuration according to any one of the first to third aspects, the control means is provided with voice notification means, and the control means is fried with the cooking object judgment means. When it is determined, the determination result is notified by voice notification means.

  According to the fifth aspect of the present invention, in the configuration according to the fourth aspect, the temperature of the food to be detected is detected by the temperature sensor when the control means determines that the food to be cooked is the fried food by the food determination means. When the temperature rises above a predetermined temperature set in advance, the voice notification means notifies the occurrence of airing.

  According to a sixth aspect of the present invention, in the configuration of the fifth aspect, the control means is provided with a human body sensor for detecting the approach of the human body to the vicinity of the main body of the cooker, and the control means is a cooking object judgment means. When it is determined that the food to be cooked is a fried food and the temperature of the food to be cooked detected by the temperature sensor rises above a preset temperature, the induction heating coil is used when the human body sensor does not detect the approach of the human body. It is configured to stop the energization to.

  According to the configuration of the first aspect of the present invention, when the object to be cooked is determined to be fried by the object determination unit, the heating power of the induction heating coil is set in advance regardless of the heating power set by the heating power setting unit. If you set this setting thermal power to a thermal power that does not cause spontaneous ignition even if a small amount of oil is heated, for example, even if the thermal power is accidentally set high when a small amount of oil is heated, spontaneous ignition will occur. It can prevent and improve safety.

  According to the configuration of claim 2 of the present invention, when the to-be-cooked determination unit determines that the food is fried, cooking the fried food by setting the upper limit temperature set in advance to prevent overheating by a predetermined temperature. It is possible to reliably prevent overheating of the top plate and the induction heating coil at the time, and to perform control with higher safety.

  According to the configuration of claim 3 of the present invention, when the cooking object determination means determines that the food is fried, the heating power of the induction heating coil is reduced stepwise as the temperature of the cooking object increases. By making the thermal power at the time of reduction a thermal power that can be set by the thermal power setting means, the safety at the time of cooking the stir-fried food is improved, and the configuration of the control means is simplified compared to the case where the thermal power dedicated to the fried food is set The thermal power display when the thermal power is forcibly reduced can be displayed using the normal thermal power display.

  By the structure of Claim 4 of this invention, when the to-be-cooked determination means determines with a stir-fry thing, it notifies that a user is cooking fried food by alerting | reporting a determination result by an audio | voice alerting | reporting means. It is possible to improve safety by prompting the firepower setting suitable for cooking and fried food.

  According to the configuration of the fifth aspect of the present invention, when the cooked object determining means determines that the food is fried, if the temperature of the cooked food rises above a predetermined temperature set in advance, the voice notification means By being configured to notify the occurrence, it is possible to further improve the safety at the time of cooking fried foods that are set to high heating power and frequently cooked.

  According to the configuration of the sixth aspect of the present invention, when the cooking object determination means determines that the food is fried, the temperature of the cooking object rises to a predetermined temperature or higher, and the human body sensor detects the approach of the human body. If not, by stopping energization to the induction heating coil, the safety at the time of cooking the stir-fried food with high possibility of ignition by tempura oil can be further improved.

  First, an embodiment according to the present invention will be described with reference to FIG. 1. Reference numeral 1 denotes a cooker body of an electromagnetic cooker that is used by being incorporated into a system kitchen or the like by a drop-in method. A pair of left and right induction heating coils 3 and 4 and a radiant heater 5 serving as heat sources for the left and right stoves are housed inside the top plate.

  On the other hand, an operation panel 6 is disposed on the right side of the front surface of the electromagnetic cooker body 1, and a grill door 8 for the grill 7 is disposed on the left side of the operation panel so that it can be pulled out. Includes a seesaw-type power switch 9, a plurality of operation keys 10, and a plurality of operation knobs 11 that perform a push-push rotation operation. The operation knobs 11... Are pulled out by a push operation to start energizing the induction heating coils 3, 4 and the radiant heater 5. When pushed, the operation is stopped. It is configured to set time, cooking temperature, etc., the left induction heating coil 3 is operated with the left operation knob 11, the radiant heater 5 is operated with the central operation knob 11, and the right operation knob 11 is operated with the right. The induction heating coil 4 is operated.

  Further, the outer peripheral edge of the top plate 2 is pressed and fixed by the top plate frame 12, and a non-contact type touch key for detecting an input operation from a change in capacitance is provided at the front end portion of the top plate frame. The constructed top surface operation unit 13 is disposed, and intake and exhaust holes 14 and 14 are opened on the left and right of the rear end of the top plate frame 12.

  On the other hand, as shown in FIG. 2, the top panel operation unit 13 has a fire key 16 on the front or back surface of the glass plate 15, hot water keys 17 and 17 for automatic water cooking, and a fried food key 18 for frying food. , 18, the grill key 19, the grill menu key 20, and the grill heating power key 21 touch areas are arranged by printing, and input operations to these touch keys are performed on an operation circuit board (not shown) disposed on the back surface of the glass plate 15. This operation circuit board is configured to detect an input operation based on a change in capacitance due to contact or proximity of a finger or the like to the touch area.

  FIG. 3 shows a part of a circuit block diagram of a control circuit 30 serving as a control means for controlling energization to the induction heating coils 3, 4 and the like. A power supply circuit is connected to a commercial 200 V power supply 31 via a relay contact 32. 33, and a main control circuit 34 constituted by a microcomputer is connected to the output of the power supply circuit, and a voltage detection circuit 35 is connected to the power supply 31 via the power switch 9. The output of the circuit is connected to the input port of the main control circuit 34, and the operation keys 10... Arranged on the operation panel 6 are connected to the input port via the key detection circuit 43.

  An inverter circuit 37 is connected to the relay contact 32 via an input current detection circuit 36, and the induction heating coils 3 and 4 and the current value supplied to the coil are detected at the output of the inverter circuit. A coil current detection circuit 38 is connected, and an output of the input current detection circuit 36 is connected to an input port of the main control circuit 34.

  Further, the output of the human body sensor 39 attached to the appropriate position of the operation panel 6 is connected to the input port of the main control circuit 34 via the human body detection circuit 40.

  The output port of the main control circuit 34 is connected to the radiant heater 5 and the upper and lower grill heaters 45, 45 disposed in the grill 7 via a heater drive circuit 44, and via a cooling fan drive circuit 46. A cooling fan 47 mounted in the cooker body 1 is connected, and a relay drive circuit 48 for operating the relay contact 32 is connected.

  Further, an LED lamp 50... For displaying an ON / OFF operation state of the operation keys 10... Arranged on the operation panel 6 is connected to the output port of the main control circuit 34 through the LED drive circuit 49. ing.

  An audio drive circuit 51 is connected to the output port of the main control circuit 34. A speaker 52 is connected to the output. Based on the output of the main control circuit 34, an audio message for operation, an operation error, and a caution when an abnormality occurs. A message is announced.

  Further, the input / output port of the main control circuit 34 is connected to a memory 53 and a communication circuit 54 constituted by a non-volatile memory for storing various data, and the communication circuit is connected to a sub-control constituted by a microcomputer. The circuit 60 is connected.

  As shown in FIG. 4, the input port of the sub-control circuit 60 includes pan bottom temperature sensors 62 and 62 disposed near the center of the induction heating coils 3 and 4 via the temperature detection circuit 61, and an induction heating coil. The coil temperature sensors 63 and 63 are connected to the induction heating coils so as to detect the temperature of the induction heating coils. The operation unit 13 is connected to the input / output port via the key detection microcomputer 66. Are connected to a hot water key 16, a water heater key 17, a deep-fried food key 18, and the like, and an input operation by these keys is detected by a change in capacitance due to the approach of a finger to these keys.

  Further, temperature data from the pan bottom temperature sensors 62 and 62 and the coil temperature sensors 63 and 63 are input to the main control circuit 34 via the sub control circuit 60, and the temperature is controlled based on the detected temperatures of these temperature sensors. A to-be-cooked judging means 64 for judging the type of the to-be-cooked food stored in the cooking container 22 placed above the induction heating coils 3 and 4 of the plate 2 is provided.

  Thus, the operation when cooking using the induction heating coils 3 and 4 will be described. After the cooking container 22 such as a pan is placed above the induction heating coils 3 and 4 of the top plate 2 (FIG. 4), the power switch 9 is turned on, and then the knob 11 of the operation panel 6 is pushed and pulled out to rotate, or the heating power is set with the heating key 16. This operation is detected by the main control circuit 34 and the sub-control circuit 60, energization of the induction heating coil 4 is started, and cooking is started.

  On the other hand, the main control circuit 34 and the sub control circuit 60 detect the temperature of the cooking container 22 from the outputs of the pan bottom temperature sensors 62 and 62 after the heating is started by the to-be-cooked object judging means 64, and this temperature is, for example, When the temperature rises once by 1 C per second, the type of the food to be cooked in the cooking container 22 is automatically determined to be “stir fry”, and as shown in FIG. In the case of 3 KW, the heating power of the induction heating coils 3 and 4 is reduced to, for example, 1500 W from the determined time T1.

  Thereby, for example, even if a small amount of oil is put into the cooking container 22 and the fried food is cooked, even if the heating power of the induction heating coils 3 and 4 is set to a high heating power of 2 KW or more and heating is started, the pan bottom temperature sensor 62 , 62 can prevent the ignition of a small amount of oil due to the response delay and improve the safety.

  In addition, when it is determined that “stir fry” at T1, the voice drive circuit 51 notifies a warning message such as “left stir fry” or “the left stove is hot”. This can alert the user and improve safety.

  On the other hand, the temperature of the cooking container 22 is further increased due to the fact that the amount of the food to be cooked is small or the user has not set the heat power suitable for the amount of the food to be cooked despite the reduction in the heat power. When the temperature of the cooking container 22 rises above the preset upper limit temperature at T2 in FIG. 5, the heating power of the induction heating coils 3 and 4 is stepped in advance corresponding to the upper limit set temperature. It is set to the upper limit setting firepower set to.

  FIG. 6 shows an example of the upper limit set temperature and the upper limit set thermal power. When the cooked food is automatically determined as “boiled food” by the main control circuit 34 and the sub control circuit 60, The upper limit temperature is set differently when it is automatically determined, thereby preventing spontaneous ignition during cooking of stir-fried food with a high use frequency of tempura oil.

  In the embodiment shown in FIG. 6, the set value of the input power that is the upper limit set thermal power is set to a thermal power that can be set from the knob 11... Or the thermal power key 16. Without being limited to this, it may be set to an intermediate value thereof, or the set value may be changed between boiled food cooking and fried food cooking.

  Further, the heating power of the induction heating coils 3 and 4 is reduced stepwise as the temperature of the food to be cooked increases. For example, the temperature of the food to be cooked rises even when set to a minimum heat power that can be set (for example, 300 W). In this case, the human body detection circuit 40 detects the presence or absence of a human body in the vicinity of the cooker body 1, and when there is no human body, the energization of the induction heating coils 3 and 4 is stopped and at the same time the voice drive circuit 51 In the case where there is a human body, a warning message such as “It is hot” is notified, and after heating according to the 300 W regulation is continued, induction heating occurs when the temperature of the object to be cooked further rises to, for example, 260 ° C. or higher. The energization to the coils 3 and 4 is stopped.

  The notification by the voice drive circuit 51 may be performed again when the human body detection circuit 40 detects the approach of the human body.

  With these configurations, when cooking fried foods that are highly likely to ignite, lowering the upper limit set temperature that reduces the thermal power compared to cooked foods, etc., further improves safety, and If the user is not around the cooker body 1 when the temperature is high, the danger of spontaneous ignition can be avoided more reliably by stopping the heating.

  The upper limit set temperature, the upper limit set thermal power, the human body detection time and the like in the above embodiment are not limited to these, and may be set as appropriate according to the sensitivity of the temperature sensor, the thickness or material of the top plate 2, and the like. In the said Example, although control is performed based on the detected temperature of the pan bottom temperature sensors 62 and 62, you may control based on the output of the coil temperature sensors 63 and 63, or both these outputs.

It is a perspective view which shows the Example of this invention. It is a top view of the principal part similarly. It is a block diagram of a control means similarly. It is a side longitudinal cross-sectional view which similarly shows the Example of the principal part. It is a graph which similarly shows the relationship between firepower and time. It is a target figure of upper limit set temperature and upper limit set thermal power similarly.

Explanation of symbols

2 Top plate 3 Induction heating coil 4 Induction heating coil 11 Operation knob (heating power setting means)
16 Thermal key (thermal power setting means)
22 Cooking container 30 Control means 39 Human body sensor 51 Voice drive circuit (voice notification means)
62 Pan bottom temperature sensor 63 Coil temperature sensor 64

Claims (6)

A top plate on which the cooking container is placed, an induction heating coil disposed below the top plate, and the temperature of the cooking container and / or the induction heating coil disposed between the top plate and the induction heating coil. A temperature sensor for detecting temperature, a thermal power setting means for setting the thermal power of the induction heating coil, and a control means for controlling the thermal power of the induction heating coil based on the output of the thermal power setting means and the temperature sensor, etc. In this case, the control means detects the temperature rising gradient of the cooking container from the output of the temperature sensor, and determines the type of the cooking object stored in the cooking container from the temperature rising gradient. And when the cooked object judging means judges that the cooked food is fried food, the induction heating is performed regardless of the set heating power set by the heating power setting means. Electromagnetic cooker, characterized in that constructed so as to set the set thermal power set the heating power of yl advance. The control means is configured to set an upper limit temperature set in advance for preventing overheating to be lower than a preset predetermined temperature when the cooked object determination means determines that the cooked food is fried. The electromagnetic cooker according to claim 1, characterized in that: When the cooking means is determined to be fried food by the cooking object determination means when the cooking means rises to a preset upper limit temperature set in advance, the upper limit heating power of the induction heating coil Is set to an upper limit set thermal power set in advance corresponding to each upper limit set temperature, and the upper limit set thermal power is set to a thermal power that can be set by the thermal power setting means. Item 2. An electromagnetic cooker according to item 1. The control means is provided with voice notification means, and the control means is configured to notify the determination result by the voice notification means when the cooked object determination means determines that the food to be cooked is fried. The electromagnetic cooking device according to any one of claims 1 to 3, wherein the cooking device is characterized by things. When the temperature of the cooking object detected by the temperature sensor rises above a predetermined temperature when the cooking means is determined to be fried food by the cooking object determination means, The electromagnetic cooker according to claim 4, wherein the notification means is configured to notify the occurrence of airing. The control means is provided with a human body sensor for detecting the approach of the human body to the vicinity of the main body of the cooking device, and the control means is used when the cooking object determination means determines that the food to be cooked is a fried food, and the temperature sensor. When the temperature of the cooking object to be detected rises above a predetermined temperature set in advance, if the human body sensor does not detect the approach of the human body, it is configured to stop energizing the induction heating coil. The electromagnetic cooker according to claim 5, characterized in that it is characterized in that