JP3837049B2 - Cooking equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cooking device having a microwave function capable of heating an object to be cooked in a heating cabinet by electromagnetic waves.
[0002]
[Prior art]
The heating cooking apparatus is provided with a humidity sensor as humidity detecting means for detecting the humidity in the heating chamber in order to determine the finish in the cooking with the microwave oven, and automatic cooking using the humidity sensor Is possible. That is, the increase in the humidity in the heating chamber is monitored by a voltage increase value ΔV from the initial voltage of the humidity sensor, and when this ΔV reaches a predetermined value set in advance, the heating is ended as cooking is completed. .
[0003]
[Problems to be solved by the invention]
However, when automatic cooking is performed using only the humidity in the heating chamber as a guideline in this way, in a case where cooking is performed continuously, if the humidity in the heating chamber is high before cooking, ΔV There is a possibility that cooking does not end without reaching the predetermined value.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide a cooking device that can reliably stop cooking during automatic cooking to prevent abnormal heating.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the invention described in claim 1 is provided with temperature detecting means for detecting the temperature in the heating chamber, and the temperature detected by the temperature detecting means is predetermined when automatic cooking is performed. When the temperature is higher than the above temperature and the temperature rises at a predetermined rate, the automatic heating cooking is stopped.
In addition to the object of claim 1, the invention described in claim 2 is provided with a gas oven function capable of heating an object to be cooked by a burner, and reasonably obtains temperature detecting means without cost. Therefore, the temperature detection means is also used for temperature detection during burner combustion.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional explanatory view of a combination range 1 as a cooking device, FIG. 2 is a lateral sectional explanatory view thereof, and the combination range 1 stores a turntable 4 on which a range dish 3 is placed in a lower stage, and a burner 5 The housed combustion chamber 6 has a substantially cubic heating chamber 2 adjacent to the left and right, and is provided with an open / close door 7 that can open and close the front surface of the heating chamber 2. An exhaust duct 8 for discharging the mixed hot air in the heating chamber 2 to the outside of the container body is connected to the upper center of the rear wall of the heating chamber 2, and a thermistor 9 and a humidity sensor 10 are connected to the exhaust duct 8 at the tip. It is provided so as to protrude into the exhaust duct 8. 11 is a magnetron that oscillates an electromagnetic wave to the center of the upper surface of the heating chamber 2 by a waveguide, 12 is a controller, and the controller 12 is a humidity detector that forms a bridge circuit with the humidity sensor 10 in addition to a control unit composed of a microcomputer. A sensor signal processing unit that has a ladder resistor and an operational amplifier and outputs a sensor signal from the humidity detection unit to the control unit is provided, and the thermistor 9 and humidity are in accordance with instructions from the operation unit 13 provided on the front surface of the heating chamber 2. While monitoring the output signal from the sensor 10, the combustion control of the burner 5 and the operation control of the magnetron 11 and the turntable 4 are performed.
[0007]
On the other hand, at the upper part of each combustion chamber 6, a suction passage 15 communicating with the heating chamber 2 by suction ports 14, 14.. A blow-out passage 17 communicating with the heating chamber 2 is provided by 16, 16,..., And a circulation fan 18 for circulating the internal air and the combustion gas from the burner 5 is provided in the blow-out passage 17. Reference numeral 19 denotes a fan motor that drives the circulation fan 18, and 20 denotes a lamp that illuminates the inside of the heating chamber 2.
[0008]
When the combination range 1 configured as described above is used as a gas oven, when the operation button for cooking the oven provided in the operation unit 13 is pressed, the lamp 20 is turned on to illuminate the inside of the cabinet, and the circulation fan 18 is used. Is activated to supply primary air and secondary air for combustion to the burner 5 from the outside of the container, and the burner 5 supplied with fuel gas is ignited by an ignition electrode (not shown) and starts combustion. The generated combustion gas is mixed with the air in the heating chamber 2 sucked into the suction passage 15 by the circulation fan 18, becomes mixed hot air, passes through the blowout passage 17, and passes through the outlets 16, 16. To cook and cook the food. The mixed hot air circulates between the heating chamber 2 and the circulation fan 18 and is then discharged from the exhaust duct 8 to the outside of the body. The controller 12 performs ON / OFF control of the combustion of the burners 5 and 5 so that the temperature in the heating chamber 2 becomes a predetermined temperature.
[0009]
Next, the case where it uses as a microwave oven is demonstrated using a flowchart.
When the start button provided on the operation unit 13 is turned on in S1, it is determined in S2 whether the internal temperature of the heating chamber 2 is 100 ° C. or less. If the internal temperature exceeds 100 ° C., it is determined in the next S3 whether the internal temperature is 200 ° C. or less. If the temperature exceeds 200 ° C., the humidity sensor 10 does not have heat resistance, so the cooking is stopped in S 4 and an error code is displayed on the operation unit 13. On the other hand, if it is 200 ° C. or less in S3, the fan motor 19 is driven to rotate the circulation fan 18 and the timer 1 is started in S5. Due to the rotation of the circulation fan 18, the hot air in the heating chamber 2 circulates in the heating chamber 2 after being circulated in the heating chamber 2, and is then discharged to the outside of the body through the exhaust duct 8 serving as an exhaust passage. Is made.
[0010]
After the rotation of the circulation fan 18 is started, if it is determined in S6 and S7 that the internal temperature does not decrease to 100 ° C. or less even after the timer 1 has elapsed for 60 seconds, the ventilation function by the circulation fan 18 has failed. Similarly, in S4, the cooking is stopped and an error code is displayed.
If the internal temperature is 100 ° C. or less in the discrimination between S2 and S6, the timer 2 is started in S8, the magnetron 11 is turned on and the turntable 4 is rotated, and the ladder is adjusted in S9. The initial voltage Vo is stored, and humidity detection is started together with cooking in S10. This ladder adjustment is a well-known control in which the microcomputer in the controller 12 turns on the internal switch and sequentially supplies the output voltage to the ladder resistor in the sensor signal processing unit to adjust the balance of the bridge circuit in the humidity detection unit. is there.
[0011]
After the start of cooking, in S11, it is determined whether or not the internal temperature Tt after t seconds is equal to or higher than a constant Th (for example, 50 ° C.). If it is below the constant Th, it is determined in S12 whether or not the voltage V from the humidity sensor 10 has increased by ΔV or more from the initial voltage Vo. Here, when ΔV is reached, the cooking is ended in S13 as a finish detection.
On the other hand, if the internal temperature Tt is equal to or greater than the constant Th in S11, it is further determined in S14 whether the temperature increase rate dTt / dt after t seconds exceeds a constant α (for example, 0.2 ° C./second). To do. If the rate of temperature increase is equal to or less than a constant α, the humidity sensor 10 is heated until ΔV reaches ΔV in S12. If the rate α exceeds the constant α, the temperature increases in S13 regardless of the voltage increase of the humidity sensor 10. Finish cooking.
Here, instead of monitoring only the temperature of the internal temperature, the temperature increase rate is monitored only under the condition that the internal temperature is high. This is to prevent such erroneous detection by looking at the temperature rise rate.
[0012]
Thus, according to the combination range 1 of the said form, the thermistor 9 as a temperature detection means which detects the temperature in the heating chamber 2 is provided, and in the case of automatic cooking, the chamber temperature obtained by the thermistor 9 is When it is equal to or greater than the constant Th and the rate of increase dTt / dt is increased by a constant α, the automatic heating cooking is stopped to perform automatic heating cooking in a state where the humidity in the heating chamber 2 is high. Makes it possible to end cooking and prevent abnormal heating.
Further, the temperature detection means of the present invention can be reasonably obtained without cost by using the thermistor 9 as the temperature detection means also for temperature detection when burning the burner 5 used in the gas oven function. it can.
[0013]
In the above embodiment, the internal temperature and the rate of temperature increase are monitored only after t seconds, but may be performed a plurality of times every predetermined time.
Moreover, although the said form demonstrated in the example applied to the combination range which provided the microwave oven function and the gas oven function side by side, even if it is a heating cooking apparatus provided only with the microwave oven function, it is applicable similarly. .
[0014]
【The invention's effect】
According to invention of Claim 1, the temperature detection means which detects the temperature in a heating chamber is provided, and in the case of automatic cooking, the detection temperature obtained by a temperature detection means is more than predetermined temperature, And when it rises at a predetermined rate of increase, by stopping automatic heating cooking, when automatic heating cooking is performed in a state where the humidity in the heating chamber is high, heating cooking is terminated and abnormal heating is performed. It becomes possible to prevent.
According to the second aspect of the present invention, in addition to the effect of the first aspect, in the case of the one having a gas oven function capable of heating the object to be cooked by the burner, the temperature detecting means is used for the combustion of the burner. The temperature detecting means can be reasonably obtained without cost by combining the temperature detecting means.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a longitudinal section of a combination range.
FIG. 2 is an explanatory diagram of a cross section of the combination range.
FIG. 3 is a flowchart of automatic heating cooking control.
[Explanation of symbols]
1 ・ ・ Combination range 2 ・ ・ Heating chamber 5 ・ ・ Burner 10 ・ ・ Humidity sensor 11 ・ ・ Magnetron 12 ・ ・ Controller 15 ・ ・ Suction passage 17 ・ ・ Blowout passage 18 ・ ・ Circulating fan .

Claims (2)

A microwave function capable of heating the object to be cooked in the heating chamber by electromagnetic waves, and humidity detecting means for detecting the humidity in the heating chamber; A heating cooking device that enables automatic heating cooking to heat a food,
Temperature detection means for detecting the temperature in the heating chamber is provided, and the detected temperature obtained by the temperature detection means during the automatic cooking is higher than a predetermined temperature and increased at a predetermined rate of increase. In the case where it does, the said heating cooking apparatus stops the said automatic heating cooking. In the thing provided with the gas oven function which can heat the to-be-cooked object in a heating chamber with a burner, the temperature detection means is used for the temperature detection in the case of combustion of the burner. Cooking equipment.

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