JPH0132410B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a cooking device that performs fermentation cooking using hot air.

(b) Prior Art A cooking appliance comprising a heater and a fan, a hot air generator that generates hot air inside a heating chamber by blowing air to the heater with the fan, and a temperature sensor that detects the temperature inside the heating chamber. In order to perform fermentation cooking, both the heater and the fan of the hot air generator are controlled on/off depending on whether the temperature in the heating chamber detected by the temperature sensor has reached a predetermined fermentation temperature. The temperature may be maintained at the above fermentation temperature and this state may be continued for a desired period of time.

However, in this case, the fan is not driven while the temperature in the heating chamber reaches the fermentation temperature, and therefore, if the time it takes to reach this temperature is long, the movement of the atmosphere in the heating chamber will take a long time. This does not occur over a long period of time, causing temperature unevenness in the atmosphere within the heating chamber, making it impossible to perform fermentation cooking uniformly.

In addition, if the heating chamber temperature is maintained at a temperature considerably higher than the fermentation temperature and normal oven cooking is performed immediately before fermentation cooking, the temperature in the heating chamber may drop even when fermentation cooking is carried out. It is kept at a fairly high temperature. This high temperature is abnormally high for fermentation cooking. Therefore, fermentation cooking is initially performed while being exposed to abnormally high temperatures, which may lead to the death of bacteria for fermentation.

Therefore, in Japanese Patent Application No. 57-43245, the applicant has disclosed that although the heater is controlled on and off depending on whether the temperature in the heating chamber reaches a predetermined fermentation temperature as detected by a temperature sensor, the fan is controlled periodically. He invented driving. As a result, the atmosphere inside the heating chamber moves periodically, and the atmosphere does not remain static for a long time as described above. Therefore, it is possible to prevent temperature unevenness in the atmosphere inside the heating chamber, and to ensure uniform fermentation cooking. can be done.

However, there is still no countermeasure taken against the case where the fermented food is exposed to abnormally high temperatures due to normal oven cooking immediately before the fermented food.

(c) Problems to be Solved by the Invention The present invention suppresses the occurrence of temperature unevenness in the heating chamber in order to perform fermentation cooking uniformly, and prevents undesired fermentation cooking from occurring when the temperature in the heating chamber is abnormally high. The aim is to provide a cooking device that will never be damaged.

(d) Means for Solving the Problems The present invention provides a hot air generator comprising a heating chamber for storing food, a heater, and a fan, and generating hot air in the heating chamber by blowing air to the heater with the fan; A cooking appliance comprising: a temperature sensor that detects the temperature inside the heating chamber; and a control section that drives and controls the heater and fan of the hot air generator based on the temperature inside the heating chamber detected by the temperature sensor,
The control unit includes a determination means for determining whether the temperature in the heating chamber detected by the temperature sensor at the start of fermentation cooking has reached an abnormally high temperature inappropriate for fermentation cooking; a prohibition/notification means for prohibiting and notifying fermentation cooking at times; a fan drive means for periodically driving the fan when the determination means makes a negative determination; and a heater driving means for energizing the heater when the fan starts to be driven when the temperature in the heating chamber is lower than a predetermined fermentation temperature, and for stopping energizing the heater at least when the fan stops driving. .

(E) Effect Although the heater is driven and controlled based on the comparison between the temperature in the heating chamber and the predetermined fermentation temperature, the fan is driven periodically and the atmosphere in the heating chamber moves periodically, causing temperature unevenness in the atmosphere. do not have.

Further, if the temperature in the heating chamber is abnormally high, fermentation cooking is prohibited and this is notified.

(f) Examples Examples of the present invention will be described below in detail with respect to a microwave oven.

In FIGS. 1 and 2, 1 is a front operation unit having a temperature knob 2, a timer knob 3, a microwave key 4, an oven key 5, a fermentation key 6, and a start key 7, 9 is a heating chamber, and 10 is a heating chamber. A magnetron oscillates microwaves to heat indoor food 11; 12 is a blower motor for cooling the magnetron; 13 is a driving force of the motor 12 transmitted via a reducer 14, a belt 15, etc. A turntable 16 on which the food 11 is placed and rotated is a hot air generator disposed on the upper wall 17 of the heating chamber.

In this device, 18 is a heater case, 19 is a heater disposed within the case, and 20 is disposed on the intake side of the heater case 18, and includes a heating chamber upper wall 17.
An intake duct connected to the intake holes 21, 21, ...
22 is a thermistor arranged in the intake duct to detect the temperature in the heating chamber 9; 23 is arranged on the discharge side of the heater case 18 and connected to the heating chamber upper wall 17;
A discharge duct connected to the discharge holes 24, 24, ...,
Reference numeral 25 denotes a circulation fan disposed within the intake duct 20, which is rotated by the driving force of the blower motor 12 transmitted via pulleys 26, 27 and a belt 28. And the heater 19
When the fan 25 rotates while energized,
The air in the heating chamber 9 reaches the inside of the heater case 18 via the intake holes 21, 21, . . .
The heated air reaches the heating chamber 9 from the discharge holes 24, 24, .

FIG. 3 shows the circuit of the microwave oven, where 29 is a commercial power supply, 30 is a first relay switch connected in series to the blower motor 12, 31 is a high voltage supply circuit that supplies high voltage to the magnetron 10, and 32
is normally connected to the heater 19 side and switches to the high pressure supply circuit 31 or the heater 19 side; 33 is a second relay switch that is connected to the high pressure supply circuit 31 or the heater 19 side;
a third relay switch 34 that controls energization to 9;
35, 36, and 37 are first, second, and third drive circuits driven by signals from the microcomputer, and 38, 39, and 40 are respectively When the first, second and third drive circuits are driven, the first, second and third relay switches 30, 32,
The first, second, and third relay coils 33 are used to turn on or switch on the relay coils, and 41 is an A/D converter that converts the signal from the thermistor 22 into a digital signal.

Next, the operation of the above microwave oven will be explained.

When performing microwave cooking, a desired microwave time is set by rotating a timer knob 3 on the front operation unit 1, a microwave key 4 is operated, and a start key 7 is operated. Then, the microcomputer 34 causes the first, second, and third drive circuits 35, 36, and 37 to start driving. When the second drive circuit 36 is driven, the second relay switch 32 is activated by the high voltage supply circuit 31.
When the switch is switched to the side and the third drive circuit 37 is driven,
The third relay switch 33 is turned on, thereby energizing the magnetron 10 and starting microwave cooking. Further, when the first drive circuit 35 is driven, the first relay switch 30 is turned on and the blower motor 1 is turned on.
2 rotates, thereby cooling the magnetron 10 and rotating the turntable 13. Then, when the desired microwave time has elapsed, the microcomputer 34 controls the first, second, and third drive circuits 35 and 3.
6 and 37 are all stopped, and therefore the microwave cooking is completed.

Next, when performing oven cooking, on the front operation unit 1, turn the timer knob 3 to set the desired oven time, and turn the temperature knob 2 to set the desired oven temperature, for example 200 ° C. After operating the oven key 5, the start key 7 is operated. Then, the microcomputer 34 causes the first and third drive circuits 35 and 37 to start driving. When the third drive circuit 37 is driven, the third relay switch 33 is turned on (in this case, the second drive circuit 36 is not driven, so the second relay switch 32 is switched to the heater 19 side), and the heater 19 is energized. . Further, when the first drive circuit 35 is driven, the blower motor 12 rotates and the circulation fan 25 rotates, thereby circulating hot air and starting oven cooking. The temperature inside the heating chamber 9 is detected by the thermistor 22, and in order to maintain the temperature inside the heating chamber 9 at the oven temperature of 200°C, drive control of the first and third drive circuits 35 and 37 is performed.
That is, hot air generation control is performed. Then, when the desired oven time has elapsed, the microcomputer 34 completely stops driving the first and third drive circuits 35 and 37, thus ending the oven cooking.

Now, fermentation cooking will be explained with reference to the flowchart of the program of the microcomputer 34 shown in FIG.

At the front operation unit 1, a timer knob 3 is rotated to set a desired long fermentation time, a fermentation key 6 is operated, and a start key 7 is operated. The program then reaches the _S1 step. In this step, the first
The drive circuit 35 is driven, the blower motor 12 rotates, and the rotation of the circulation fan 25 and the turntable 13 are started. In the following _S2 step, the temperature inside the heating chamber 9 detected by the thermistor 22 is an abnormally high temperature T ₃ due to the oven cooking that was performed just before, for example, 90°C (this temperature is the temperature that the bacteria are It is determined whether or not the temperature has reached a level (preset in the microcomputer 34) that is abnormally high enough to cause death. Such _S2 step corresponds to the determination means of the present invention. In this case, assuming that no oven cooking is being performed and the abnormally high temperature _T3 has not been reached, the program proceeds to step _S3 . At this time, if the abnormal high temperature _T3 has been reached, the program advances to step _S3 ', where the drive of the first drive circuit 35 is stopped and the blower motor 12 is stopped.
rotation is stopped, and a buzzer (not shown) sounds for several seconds to notify of an abnormality. Therefore, it is prohibited that the fermentation cooking described below is carried out in a state where the bacteria are killed, thereby preventing the fermentation cooking from being carried out undesirably. That way
The _S3 ' step corresponds to the prohibition/notification means of the present invention. After that, it enters a standby state for the next cooking.

Then, in step _S3 , the fermentation time is set in the timer counter TIME in the microcomputer 34, and counting down of the time is started. In the following _S4 step, it is determined whether the temperature inside the heating chamber 9 is higher than a second temperature T ₂ , for example, 55°C (this temperature is used for fermentation and is set in advance in the microcomputer 34). be done. In this case, if the second temperature is not higher than _T2 , the program proceeds to step S5. In this step, the third drive circuit 37 is driven to energize the heater 19, and since the blower motor 12 has already been rotated, hot air begins to circulate. After that, the program returns to step S4 until the temperature inside the heating chamber 9 reaches the second temperature T2 _or higher.
Cycle through _S4 and S5 steps. Heating chamber 9 at this time
The temperature inside gradually rises to the second temperature _T2 as shown in the range of FIG. 5A. FIGS. 5B and 5C show the state in which the heater 19 and the blower motor 12 are energized, respectively.

When the temperature inside the heating chamber 9 reaches the second temperature T2 _or higher, the program exits the cycle of steps S4 and S5 at step S4 and proceeds to steps S6 to S8.
In step S6, the driving of the first drive circuit 35 is stopped and the rotation of the blower motor 12 is stopped, and in step S7
In step S8, the drive of the third drive circuit 37 is stopped and the power supply to the heater 19 is stopped, and in step S8, the blower off timer counter in the microcomputer 34 is stopped.
An off time, for example 55 seconds, is set at _t1 , and a down count is started from this time. In the following step S9, it is determined whether the contents of the timer counter TIME have become 0 or not. In this case, if it has not become 0, the program proceeds to step S10, and it is determined whether the contents of the blower off timer counter _t1 have become 0. If the content is also non-zero, the program returns to step S9 and then cycles through steps S9 and S10. At this time, the temperature inside the heating chamber 9 gradually decreases as shown in the range A in FIG.

Then, when the contents of the blower off timer counter _t1 become 0 after 55 seconds of off time elapse, the program starts.
Proceed to step S11 and set the blower off timer counter.
The down count at t ₁ is stopped. In the following step S12, it is determined whether the temperature inside the heating chamber 9 is higher than a first temperature T ₁ , for example, 50°C (this temperature is used for fermentation and is set in advance in the microcomputer 34). Ru. In this case, if the temperature is higher than the first temperature _T1 , the program proceeds to step S13, which is similar to step S1, and the blower motor 12 rotates. Note that since the heater 19 is not energized,
Only air is blown into the heating chamber 9. In the following S14 step, the on-timer counter t ₂
An on time, for example 5 seconds, is set, and a down count is started from this time.

And the program is S15 which is similar to S9 step.
After passing through the steps, proceed to step S16. This step is similar to step S4, in which case the temperature in the heating chamber 9 is usually lower than the second temperature _T2 , so the program continues to step S17. If the temperature in the heating chamber 9 is higher than the second temperature _T2 , the program proceeds to step S17 after passing through step S16', which is similar to step S7. In this step, it is determined whether the contents of the blower-on timer counter _t2 have become zero. If it is not 0 in this case, the program returns to step S15 and cycles through steps S15 to S17. The temperature inside the heating chamber 9 at this time is shown in Figure 5A.
As shown in the range below, the range gradually decreases. When the on-time period of 5 seconds has elapsed and the contents of the blower-on timer counter _t2 become 0, the program proceeds to step S18, and the down-counting of the blower-on timer counter _t2 is stopped.

After that, the program returns to step S6 and returns to step S6~
After passing through step S8, the process cycles through steps S9 and S10 (at this time, the temperature inside the heating chamber 9 continues to gradually decrease as shown in the range A in FIG. 5), and then from step S11 to step S12. reach. In such a case, assuming that the temperature in the heating chamber 9 is lower than the first temperature _T1 , the program includes step S19, which is similar to steps S1 and S13, and step S20, which is similar to step S5.
The process advances to step 9, and hot air begins to circulate within the heating chamber 9. And after the program goes through S14 step
Cycle through steps S15 to S17 (at this time, heat chamber 9
(The temperature inside rises as shown in the range A in FIG. 5), and then returns to step S6 via step S18.

After that, the timer counter will be displayed after the fermentation time has elapsed.
The program continues until the contents of TIME become 0.
It cycles between steps S6 and S18, and the blower motor 12 is periodically rotated for 5 seconds every 55 seconds (corresponding to the fan drive means of the present invention), and the heater 19 rotates for 5 seconds at 55 second intervals. When the temperature inside the heating chamber 9 at the time of starting the rotation is lower than the first temperature _T1 , the blower motor 12 is energized when the rotation starts, and the energization is stopped at least when the blower motor 12 stops rotating (the heater driving means of the present invention equivalent). In this case, when the blower motor 12 rotates and the heater 19 is energized, a hot air circulation state occurs.

Here, the blower motor 12 is always periodically rotated (blows air) in the heating chamber 9 regardless of the temperature inside the heating chamber 9, and the air in the heating chamber 9 is agitated accordingly. The occurrence of temperature unevenness can be significantly suppressed.

Then, when the fermentation time has passed, the timer counter
When the content of TIME becomes 0, the program repeats the above cycle from step S9 or S15 to step S21.
In this step, the counter etc. of the microcomputer 34 and the output of the microcomputer 34 are all reset, and therefore the fermentation cooking is completed. The program then enters a standby state for the next cooking.

(g) Effects of the Invention According to the present invention, there is provided a hot air generator comprising a heating chamber for storing food, a heater, and a fan, which generates hot air in the heating chamber by blowing air to the heater with the fan, and a hot air generator in the heating chamber. In the cooking appliance, the cooking device includes a temperature sensor that detects the temperature of determining means for determining whether the temperature in the heating chamber detected by the temperature sensor at the time of start has reached an abnormally high temperature inappropriate for fermented cooking; and when the determining means makes an affirmative determination, prohibiting fermented cooking; a prohibition/notification means for notifying; a fan drive means for periodically driving the fan when the determination means makes a negative determination; Since the heater drive means includes a heater driving means for energizing the heater when the fan starts driving when the temperature is lower than the temperature, and for stopping energizing the heater at least when the fan stops driving, it is possible to noticeably prevent temperature unevenness in the heating chamber. The fermentation can be suppressed and fermented uniformly, and fermentation cooking can be prevented from undesirably being carried out in a state where the temperature in the heating chamber is abnormally high enough to kill the fermenting bacteria.

[Brief explanation of drawings]

The drawings show a microwave oven according to an embodiment of the present invention; FIG. 1 is a sectional view, FIG. 2 is a front view of the front operation section, FIG. 3 is a circuit diagram, FIG. 4 is a flowchart of a microcomputer program, and FIG. FIG. 5A is a temperature characteristic diagram in the heating chamber, and FIGS. 5B and 5C are a heater energization state diagram and a blower motor energization state diagram, respectively. 9... Heating chamber, 16... Hot air generator, 19...
... Heater, 22 ... Thermistor, 25 ... Circulation fan, 34 ... Microcomputer.

Claims (1)

[Claims] 1. A hot air generator that includes a heating chamber for storing food, a heater, and a fan, and generates hot air in the heating chamber by blowing air to the heater with the fan; a temperature detector that detects the temperature inside the heating chamber;
In the cooking device, the cooking device includes a control unit that drives and controls the heater and the fan of the hot air generator based on the temperature in the heating room detected by the temperature sensor, and the control unit controls the temperature detected by the temperature sensor at the start of fermentation cooking. a determination means for determining whether the heated indoor temperature has reached an abnormally high temperature inappropriate for fermentation cooking; a prohibition/notification means for prohibiting and notifying fermentation cooking when the determination means makes an affirmative determination; a fan drive means for periodically driving the fan when the determination means makes a negative determination; and a fan drive means for driving the fan when the heating chamber temperature detected by the temperature sensor at the time of starting driving of the fan is lower than a predetermined fermentation temperature. A cooking appliance characterized by comprising: heater drive means for supplying power to the heater when the fan is started, and for stopping supply of power to the heater at least when the fan stops driving.