JPH08121780A - Microwave oven - Google Patents

Abstract

PURPOSE: To prevent uneven cleaning operation by driving an air fan means after completion of heating cooking to exhaust air in a heating cooking chamber for execution of the cleaning operation, and setting operation time during the heating cooking and after the completion of the heating cooking based upon an output from a gas sensor. CONSTITUTION: A microwave oven is adapted such that microwaves from a magnetron 5 are fed into a heating cooking chamber 2 to range-heat an article to be cooked, and further that a cooking fan device 6 is provided in a machine chamber 4 in which the magnetron 5, etc., are accommodated, for cooling the magnetron 5 and other electrical parts. An exhaust outlet 11 is formed in a side wall of the heating cooking chamber 2, to which there is connected an exhaust duct 12 on which there are provided a gas sensor 13 and an alcohol sensor 14. After completion of heating cooking the cooling fan 6 is driven for cleaning operation to exhaust air in the heating cooking chamber 2. Cleaning operation time is set during the heating cooling and after the completion of the heating based upon an output from the gas sensor 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave oven having a function of executing a cleaning operation for exhausting air in a cooking chamber after completion of cooking.

[0002]

2. Description of the Related Art Some microwave ovens are provided with a gas sensor for detecting a gas such as water vapor generated from a cooking product, and are configured to automatically control cooking based on the detection output of the gas sensor. . In such a configuration, an air blower for exhausting the air in the heating cooking chamber is provided, and after the heating and cooking is finished, the air blower is driven to perform the cleaning operation for exhausting the air in the heating cooking chamber. . In this case, the cleaning operation causes air that has become dirty due to the execution of cooking to be exhausted from the heating and cooking chamber. As a result, when the next cooking is performed, the air in the cooking chamber is clean, so that the automatic cooking based on the gas sensor can be accurately controlled.

[0003]

However, in the above-mentioned conventional configuration, when the amount of food to be cooked is small, the cleaning operation can be completed in a short time because the air in the heating cooking chamber is less contaminated. Was set to a predetermined fixed time (for example, 2 minutes), so that wasteful operation was performed. On the other hand, if there is a large amount of food to be cooked, the air in the cooking chamber will become dirty much, but the cleaning operation will end within a certain period of time, so the dirty air will not be exhausted sufficiently from the cooking chamber. The gas sensor may remain and the gas sensor may erroneously detect it in the next cooking.

Therefore, an object of the present invention is to prevent the cleaning operation from becoming excessive or deficient by allowing the cleaning operation after the completion of cooking to be executed for an appropriate time regardless of the amount of food to be cooked or the length of cooking time. Providing a microwave oven to get.

[0005]

The microwave oven of the present invention comprises:
A magnetron for heating the cooked food in the cooking chamber in a microwave oven is provided, a gas sensor for detecting gas such as water vapor generated from the cooked food is provided, and an air blowing unit for exhausting the air in the cooking chamber is provided. The cleaning operation is provided based on the detection output output from the gas sensor during the heating cooking and after the heating cooking is completed, the operation control means is provided for driving the air blowing means to perform the cleaning operation for exhausting the air in the heating cooking chamber. It is characterized in that it is provided with setting means for setting the operating time.

Further, in place of the constitution in which the operating time of the cleaning operation is set based on the detection output outputted from the gas sensor, there is provided a clocking means for measuring the heating and cooking time from the start to the end of the cooking and the heating and cooking time is set. It is also preferable to set the operation time of the cleaning operation based on the above. Furthermore, a weight sensor for detecting the weight of the food item may be provided, and the operation time of the cleaning operation may be set based on the weight of the food item.

Furthermore, it is more preferable to set the operation time of the cleaning operation based on the detection output from the gas sensor immediately after the end of heating and after the elapse of the set time. Alternatively, a configuration may be conceived in which the cleaning operation is executed after the heating and cooking are completed until the detection output from the gas sensor reaches a predetermined ratio of the initial detection output.

[0008]

According to the above-mentioned means, the operating time of the cleaning operation is set based on the detection output from the gas sensor during and after the cooking is completed. The time is suitable for the quantity. Therefore, the cleaning operation can be performed without excess or deficiency regardless of the amount of the cooked food.

Further, even when the operation time of the cleaning operation is set based on the heating and cooking time instead of the detection output output from the gas sensor, the operation time of the cleaning operation becomes a time suitable for the heating and cooking time. Therefore,
Similar to the above configuration, the cleaning operation can be performed without excess or deficiency regardless of the length of the cooking time. Furthermore,
Even if the weight sensor for detecting the weight of the food is provided and the operation time of the cleaning operation is set based on the detected weight of the food, the operation time of the cleaning operation becomes a time suitable for the amount of the food, and The cleaning operation can be performed just enough.

Further, even when the operation time of the cleaning operation is set based on the detection output from the gas sensor immediately after the end of heating and after the elapse of the set time, the operation time of the cleaning operation depends on the amount of food and The time is suitable for cooking time. Also, even when the cleaning operation is configured to be executed after the heating and cooking are completed until the detection output output from the gas sensor reaches a predetermined ratio of the initial detection output, the operation time of the cleaning operation is The time is suitable for the amount and cooking time.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. First, in FIG. 2 and FIG. 3 showing a schematic overall configuration of a microwave oven, a cooking chamber 2 for accommodating and cooking food is provided inside the microwave oven main body 1. The front opening of the heating and cooking chamber 2 serves as an inlet / outlet for food and drinks, and also has a door 3
It is configured to be opened and closed by. Further, a machine room 4 is provided on the right side of the heating and cooking room 2 in the range main body 1. Inside the machine room 4, for example, a magnetron 5 which is a heating means is arranged.

The magnetron 5 supplies microwaves into the heating / cooking chamber 2 to range-heat (microwave-heat) the food contained in the heating / cooking chamber 2. Further, in the machine room 4, a cooling fan device 6 for cooling the magnetron 5 and other electric parts is arranged. The cooling fan device 6 includes a fan 7 and a fan motor 8 that rotationally drives the fan 7. A part of the cooling wind generated by the cooling fan device 6 is configured to be supplied into the cooking chamber 2 through the duct 9 and the vent 10 after cooling the magnetron 5. In this case, the cooling fan device 6 constitutes a blower.

An exhaust port 11 consisting of a large number of small holes is provided in the upper part of the left side wall of the heating and cooking chamber 2. An exhaust duct 12 communicating with the outside of the range main body 1 is arranged outside the exhaust port 11. In the case of this configuration, the cooling fan device 6 is driven and the cooling air is supplied into the heating cooking chamber 2 through the ventilation port 10, whereby the air in the heating cooking chamber 2 is exhausted through the exhaust port 11 and the exhaust duct 12. It is configured to be discharged to the outside through the. Further, inside the exhaust duct 12, a gas sensor 13 that detects a gas such as water vapor generated from the cooking product and an alcohol sensor 14 that detects an alcohol gas generated from the cooking product are provided. Each of the sensors 13 and 14 is configured to output a voltage signal of a voltage level corresponding to the concentration of each gas as a detection signal. In this case, the alcohol sensor 1
4 is a kind of gas sensor.

On the other hand, on the inner bottom portion of the heating and cooking chamber 2, there is rotatably arranged a rotary plate 15 for placing a food item. As shown in FIG. 3, the rotary plate 15 is configured to be rotationally driven via a rotary shaft 18 by a drive mechanism section 17 having an RT motor 16 (see FIG. 4) built therein. A weight sensor 19 (see FIG. 4) that detects the weight of the food item placed on the rotary plate 15 is provided in the drive mechanism unit 17. The weight sensor 19 is, for example, a capacitance type sensor, and is configured to output a frequency signal having a frequency corresponding to the load (weight of the food) acting on the rotating shaft 18 as a weight detection signal.

A hot air supply device 20 is disposed at the rear of the heating and cooking chamber 2, and hot air is circulated and supplied from the hot air supply device 20 into the heating and cooking chamber 2 so that the heating and cooking chamber 2 can be heated. The food items therein are configured to be oven-cooked. The hot air supply device 20 includes a fan 21, a hot air fan motor 22 and a heater 23.

At the right end of the front surface of the range main body 1, as shown in FIG.
As shown in, an operation panel section 24 is provided. Various operation switches 25 (see FIG. 4) and various indicators 26 (see FIG. 4) are arranged on the operation panel section 24. The various operation switches 25 are, for example, a switch for selectively setting various cooking menus, a start switch for starting a cooking operation, and a switch for designating the strength of heating during the cooking operation. Further, the various display devices 26 are a display device for displaying the selected cooking menu, a display device for displaying the heating output, a display device for displaying the time and the cooking time, and the like.

In FIG. 4, which shows the electrical configuration of the microwave oven in functional blocks, the control circuit 27, which is, for example, a microcomputer, has a cooking control function for controlling the heating and cooking operation of the microwave oven. , A control program therefor is stored in the internal memory. The control circuit 27 has various functions as operation control means and setting means. The control circuit 27 is configured to receive switch signals from various operation switches 25, a detection signal from the alcohol sensor 14, a detection signal from the gas sensor 13, and a weight detection signal from the weight sensor 19. There is.

Further, the control circuit 27 drives and controls the magnetron 5 via the drive circuit 28, and the R of the drive mechanism section 17 is controlled.
The T motor 16, the fan motor 8 of the cooling fan device 6, the hot air fan motor 22, and the heater 23 are controlled to be turned on and off via the drive circuit 29, and various display devices 26 of the operation panel unit 24 are drive-controlled. Further, the buzzer 30 for notifying the end of cooking and the abnormality is driven and controlled.

Next, the operation of the above configuration will be described with reference to FIG. The flowchart shown in FIG. 1 shows the schematic control contents of the control program stored in the control circuit 27. In this case, as the automatic cooking by the gas sensor 13, a cooking operation for performing warm cooking of milk or the like will be described. First, in step S1 of FIG. 1, when the user operates the warming operation switch in the operation switch 25 to selectively set warming cooking and then operates the start switch, the process proceeds to step S2. Then, the magnetron 5 is oscillated by the control circuit 27, and the range heating (warming) is started. At this time, the fan motor 8 of the cooling fan device 6 is also started to be energized at the same time. Furthermore, the above magnetron 5
Simultaneously with the oscillation of, the timer built in the control circuit 27 starts counting (step S3).

Then, the voltage V of the gas detection signal supplied from the gas sensor 13 is read (step S4). Then, it is determined whether the read voltage V is the maximum value up to that point (step S5). In this case, the read voltage V is the maximum value since it is the first read voltage. Therefore, the process proceeds to "YES" in step S5, and the voltage V is stored as the peak value Vmax (step S6).

Then, the read voltage V and the peak value Vma
Based on x, the rate of change Δ from the peak value when the voltage level of the gas detection signal output from the gas sensor 13 starts to decrease after reaching the peak value is calculated (step S7). Specifically, the read voltage V and peak value V
It is calculated from max according to the following formula.

Δ = (Vmax-V) / Vmax In this case, since the voltage V and the peak value Vmax are the same, the change rate Δ becomes zero. That is, the rate of change Δ remains zero until the voltage level of the gas detection signal reaches the peak value and then begins to decrease. Subsequently, the calculated change rate Δ and the constant α are compared (step S8). In this case, the rate of change Δ is zero, which is smaller than the constant α.
The process proceeds to “NO” at 8, and returns to the process of step S4 (process of reading the voltage V of the gas detection signal).

In step S4, the control circuit 27
The processing for reading the voltage V of the gas detection signal from the gas sensor 13 is configured to be performed, for example, every 1 second (to sample every 1 second). After the reading, until the voltage level of the gas detection signal reaches the peak value, in other words, while the voltage level reaches the peak value and remains at the peak value, “YES” in step S5.
To proceed to. If the read voltage V starts to decrease from the peak value Vmax, step S5
In step S8, the process proceeds to “NO”, and until the change rate Δ becomes larger than the constant α, the process proceeds to “NO” and proceeds to the process of step S4 (the process of reading the voltage V of the gas detection signal). I'm supposed to come back.

Therefore, the read voltage V is the peak value Vma.
Even if it starts to decrease from x, if the read voltage V rises again when the rate of change Δ is smaller than the constant α and the peak value Vmax up to that point is updated, “YES” in step S5. Is configured to proceed to.

After that, when the cooking progresses and the voltage V read from the gas sensor 13 decreases from the peak value Vmax and the rate of change Δ becomes larger than the constant α, step S
Proceed to “YES” at 8. Then, the time measured by the timer from the start of heating until the change rate Δ becomes larger than the constant α is stored as Tα (step S9). continue,
The remaining operating time T is calculated based on the above-mentioned measured time Tα (step S10). Specifically, it is calculated according to the following formula.

T = β × Tα where β is a constant.

After that, the heating operation is executed only during the remaining operation time T calculated above. Specifically, after setting the remaining operation time T in the subtraction timer built in the control circuit 27, the countdown of the subtraction timer is started (step S11), and the heating operation is executed until the subtraction timer becomes zero. (Step S12).

Now, when the subtraction timer has become zero, the process proceeds to "YES" at step S12, and the heating ending process is performed. That is, at the end of this heating, the gas sensor 13
The voltage V of the detection signal output from is read, and this voltage V is stored as the voltage Ve of the detection signal after completion of heating (step S13). At the same time, the magnetron 5 is stopped and the heating operation (warming) is completed (step S14). At this heating end time (heating end judgment time), the fan motor 8 of the cooling fan device 6 is not turned off in order to execute the exhaust operation (ie, the cooling operation).

Subsequently, a process for determining the operating time of the exhaust operation (that is, the cooling operation) for exhausting the air in the cooking chamber 2 is executed, and the exhaust operation is performed for the determined operating time. Specifically, first, it is determined whether or not the exhaust operation is necessary (step S15). Here, based on the peak value Vmax of the voltage V of the detection signal that is the detection output that is output from the gas sensor 13 during cooking, and the voltage Ve of the detection signal that is the detection output that is output from the gas sensor 13 at the end of heating. , If Ve / Vmax is 0.5 or less, the exhaust operation is executed because the air in the cooking chamber 2 is dirty, and if not, the exhaust operation is executed because the air in the cooking chamber 2 is not dirty. Do not finish driving.

Therefore, the case where Ve / Vmax is 0.5 or less, that is, the case of proceeding to "YES" in step S15 will be described. In this case, the control circuit 27 calculates the operating time (exhaust time) Tc of the exhaust operation according to the following formula, based on the peak value Vmax of the voltage during cooking and the voltage Ve at the end of heating. It is set (step S16).

Tc = (Vmax / Ve) × 30 (1) However, the unit of the operating time Tc is seconds.

Here, since each value of Vmax and Ve is a value that reflects the amount of food, and the above equation (1) is an empirical equation obtained by conducting many experiments, the above equation is obtained. The operating time Tc calculated according to (1) is an operating time suitable for the amount of cooked food, whether it is sufficient or not.

Subsequently, the exhaust operation is executed only during the calculated operation time Tc. Specifically, after setting the operating time Tc in the subtraction timer built in the control circuit 27,
The countdown of the subtraction timer is started to start the exhaust operation (step S17). Then, the exhaust operation is executed until the subtraction time of the subtraction timer becomes zero (step S18).

After this, the subtraction timer (operating time Tc)
When is zero, the process proceeds to "YES" in step S18, and the exhaust operation ending process is performed (step S19). Specifically, the fan motor 8 of the cooling fan device 6 is stopped by disconnection. As a result, exhaust operation (cleaning operation)
Is completed and the next cooking is ready to be performed. That is, returning to the main routine, the user is allowed to select and set a desired cooking menu (mode). Then, at this time, by performing the exhaust operation, the cooking chamber 2
The air inside is clean.

On the other hand, in step S15, Ve
/ Vmax is not less than 0.5, that is, Ve / Vmax
When is greater than 0.5, the process proceeds to "NO" in step S15. Then, the process proceeds to step S19, and the fan motor 8 of the cooling fan device 6 is stopped by disconnection. In this case, the cooking is finished (the magnetron 5 is stopped)
At about the same time, the fan motor 8 is stopped and the exhaust operation is not performed.

According to this embodiment having such a configuration, the detection output outputted from the gas sensor 13 during heating and after heating is finished, specifically, the peak value Vmax of the voltage V of the detection signal and the end of the cooking Based on the voltage Ve, the above formula (1)
According to the operation time Tc of the cleaning operation (exhaust operation)
Is calculated (set), the operating time Tc of the cleaning operation is a time suitable for the amount (somewhat) of the food to be cooked. Therefore, unlike the conventional configuration, the cleaning operation can be performed regardless of the amount of food to be cooked. In the above embodiment, the value of the constant (30) in the equation (1) is not limited to this, and may be set appropriately according to the microwave oven to be applied.

FIG. 5 shows a second embodiment of the present invention, and the difference from the first embodiment will be described. The second
The mechanical configuration and the electrical configuration of this embodiment are the same as those of the first embodiment. The second embodiment differs from the first embodiment in that, when the operating time Tc of the cleaning operation is set (calculated), it is based on the cooking time instead of the detection output output from the gas sensor 13. The point is that the operating time Tc is set. Hereinafter, for example, the configuration applied when the cooking for drinking is performed will be specifically described.

In this case, the cooking time Tm from the start to the end of cooking is set by the timer built in the control circuit 27.
After the time is counted, the control circuit 27 is configured to calculate and set the operating time Tc of the cleaning operation according to the following formula based on the above-described clocked cooking time Tm.
Here, the built-in timer of the control circuit 27 constitutes a time measuring means.

Tc = 0.43 × Tm + 6.3 (2) However, each unit of time Tc and Tm is second.

FIG. 5 shows the relationship between the operating time Tc and the cooking time Tm expressed by the above equation (2). In FIG. 5, a case of drinking 1 go of sake and a case of drinking 5 go of sake are plotted and shown. In this way, when the operating time Tc of the cleaning operation is set, the operating time T
c is a time suitable for the length of the cooking time Tm. still,
The reason why such a setting method is suitable is that, when the cooking time Tm is long, the degree of contamination of the air in the cooking chamber 2 increases, and therefore the operating time Tc of the cooling operation needs to be lengthened. On the other hand, when the cooking time Tm is short, the degree of contamination of the air in the cooking chamber 2 is small, so that the operating time Tc of the cooling operation can be shortened. .

Therefore, when the cleaning operation is executed for the operation time Tc set (calculated) by the control circuit 27 after the heating and cooking are completed, unlike the conventional configuration, the cleaning operation is overrun regardless of the length of the cooking time Tm. You will be able to run without any shortage. In the second embodiment, the setting control of the operating time Tc described above is realized by software control by the control circuit 27. In other words, the control for executing the setting control of the operating time Tc described above. The program is stored in the control circuit 27. In addition, in the second embodiment, each value of the constants (0.43, 6.3) in the equation (2) is not limited to this, and may be set as appropriate according to the microwave oven to be applied. good.

FIG. 6 shows a third embodiment of the present invention, and the difference from the second embodiment will be described. The third
The mechanical and electrical configurations of this embodiment are the same as those of the first or second embodiment. The third embodiment differs from the second embodiment in that when the operating time Tc of the cleaning operation is set (calculated), the operating time Tc is based on the weight of the cooked product instead of the cooking time Tm. It is a point that is configured to set. Hereinafter, for example, the configuration applied when the cooking for drinking is performed will be specifically described.

In the case of this configuration, the control circuit 27 receives the detection signal output from the weight sensor 19 for detecting the weight of the food, determines the weight W of the food, and then based on the weight W of the food. The operating time Tc of the cleaning operation is calculated and set according to the following equation.

Tc = 0.064 × W + 23 (3) However, the unit of the weight W is gram, and the unit of the operating time Tc is second.

FIG. 6 shows the relationship between the operating time Tc expressed by the above equation (3) and the weight W of the food. In FIG. 6,
Plots of the case of drinking 1 go of sake and the case of drinking 3 go of sake are shown. When the operating time Tc of the cleaning operation is set in this manner, the operating time Tc becomes a time suitable for the size of the weight W of the food. The reason why such a setting method is suitable is that when the weight W of the cooked food is heavy, the cooking time becomes long and the degree of contamination of the air in the cooking chamber 2 becomes large. However, when the weight W of the food is light, the cooking time Tm is shortened and the air in the cooking chamber 2 is less contaminated. It is based on the fact that the operating time Tc of the ring operation can be shortened.

Therefore, when the cleaning operation is executed for the operation time Tc set (calculated) by the control circuit 27 after the completion of heating and cooking, unlike the conventional configuration, the cleaning operation can be performed properly regardless of the amount of the food. You will be able to execute. In the third embodiment, similar to the second embodiment, the control of the operating time Tc is realized by software control by the control circuit 27. In the third embodiment, each value of the constants (0.064, 23) in the equation (3) is
The present invention is not limited to this, and may be set appropriately according to the microwave oven to be applied.

FIGS. 7 and 8 show a fourth embodiment of the present invention, and the difference from the third embodiment will be described.
The mechanical and electrical configurations of the fourth embodiment are the same as those of the first embodiment.
To the same configuration as that of the third embodiment. The fourth embodiment differs from the third embodiment in that
When setting (calculating) the operation time Tc of the cleaning operation, the operation is performed based on the detection output that is output from the alcohol sensor 14, which is a gas sensor, immediately after the end of heating cooking instead of the weight W of the cooking product and after the set time has elapsed. The point is that the time Tc is set. Hereinafter, for example, the configuration applied when the cooking for drinking is performed will be specifically described.

In the case of this configuration, the control circuit 27 reads and stores the voltage a of the detection signal output from the alcohol sensor 14 immediately after the end of heating and cooking, and then executes the cleaning operation for a set time, for example, 15 seconds. Then, at this time, the voltage b of the detection signal output from the alcohol sensor 14 is read and stored. Subsequently, the control circuit 27 is configured to calculate and set the operating time Tc of the cleaning operation according to the following equation based on the voltage a and the voltage b.

Tc = (52.5-a) / (b−a) +15 (4) However, the unit of a and b is V, and the unit of operating time Tc is second.

Here, FIG. 7 shows the change in the voltage level of the detection signal output from the alcohol sensor 14 when one cup of sake is drunk according to the fourth embodiment. In this case, as shown in FIG.
Is 0.905 V, the voltage b after 15 seconds has elapsed from the end of heating and cooking is 2.476 V, and the operating time Tc calculated by the equation (4) is about 47.8 seconds. Therefore, when 15 seconds have passed from the end of heating and cooking, the cooling operation is continued for another 32.8 seconds.

Further, FIG. 8 shows changes in the voltage level of the detection signal output from the alcohol sensor 14 when drinking 5 kinds of sake according to the fourth embodiment. In this case, as shown in FIG. 8, the voltage a immediately after the heating and cooking is 0.614 V, and the voltage b after the lapse of 15 seconds after the heating and cooking is 1.185 V, and the operation calculated by the formula (4) is performed. The time Tc is about 105.9 seconds. Therefore, when 15 seconds have passed from the end of heating and cooking, the cooling operation is continued for another 90.9 seconds.

In the fourth embodiment, the voltage b from the alcohol sensor 14 at this point and the voltage a from the alcohol sensor 14 immediately after the heating and cooking are finished when the cleaning operation is executed for 15 seconds after the heating and cooking are finished. Based on the above, the operating time required to clean the air in the cooking chamber 2 is predicted, and this predicted time is calculated by the above equation (4). In this case, the above formula (4) is a formula obtained by conducting many experiments. Therefore, the operating time Tc of the cleaning operation calculated by the above equation (4) is suitable for the amount of food to be cooked and the length of cooking time. As a result, also in the fourth embodiment, the same effect as in the first to third embodiments can be obtained.

In the fourth embodiment, similar to the third embodiment, the control of the operating time Tc is realized by software control by the control circuit 27. Further, in the above fourth embodiment,
15 seconds as the set time and the constant (5
Each value of 2.5, 15) is not limited to this, and may be set as appropriate according to the microwave oven to be applied.

FIGS. 9 and 10 show a fifth embodiment of the present invention, and the difference from the first embodiment will be described.
The mechanical and electrical configurations of the fifth embodiment are the same as those of the first embodiment.
The configuration is the same as that of the above embodiment. The fifth embodiment is different from the first embodiment in that instead of setting (calculating) the operation time Tc of the cleaning operation based on the detection output output from the gas sensor 13, the cleaning operation is performed by heating and cooking. The point is that operation control is performed so that the detection output output from the alcohol sensor 14, which is a gas sensor, after the end is performed until the detection output reaches a predetermined ratio of the initial detection output. Hereinafter, for example, the configuration applied when the cooking for drinking is performed will be specifically described.

In the case of this configuration, the control circuit 27 reads the voltage c of the detection signal output from the alcohol sensor 14 at the start of cooking and stores it as the initial detection output. After that, the control circuit 27 starts the cleaning operation (exhaust operation) at the time when the heating and cooking are finished. And
The control circuit 27 reads the voltage of the detection signal output from the alcohol sensor 14 with the progress of the cleaning operation, for example, every one second, and the read voltage value is the voltage c.
(That is, the initial detection output) is executed until it reaches a predetermined ratio, for example, 0.8.

Here, FIG. 9 shows the change in the voltage level of the detection signal output from the alcohol sensor 14 when one sake is drunk according to the fifth embodiment. In this case, as shown in FIG. 9, the voltage c at the start of cooking is 3.290 V, and the voltage of the detection signal output from the alcohol sensor 14 is ( Voltage c × 0.8) = 2.632V
Is configured to continue until.

Further, FIG. 10 shows changes in the voltage level of the detection signal output from the alcohol sensor 14 when 5 kinds of sake are drunk according to the fifth embodiment. In this case, as shown in FIG. 10, voltage c at the start of heating and cooking
Is 2.867 V, and the voltage of the detection signal output from the alcohol sensor 14 is (voltage c × 0.8) = 2.293 after the cleaning operation is performed after the end of cooking.
It will continue until it reaches V.

In the fifth embodiment, the cleaning operation is executed after the cooking is finished, and the voltage of the detection signal output from the alcohol sensor 14 is read every one second, so that the air in the cooking chamber 2 is cooled. Monitor how clean it is.
The cleaning operation is executed until the temperature reaches 0.8), that is, until the air in the cooking chamber 2 becomes sufficiently clean. As a result, the operation time of the cleaning operation becomes a time suitable for the amount of food to be cooked and the length of cooking time. Therefore, even in the fifth embodiment, the first
It is possible to obtain substantially the same effect as that of the fourth embodiment.

In the fifth embodiment as well, similar to the above-mentioned respective embodiments, the execution control of the cleaning operation described above is realized by software control by the control circuit 27. Further, although the specific value of the predetermined ratio is set to 0.8 in the fifth embodiment, the present invention is not limited to this, and an optimum value may be set appropriately according to the microwave oven to be applied.

In each of the above embodiments, the magnetron 5 and the cooling fan device 6 for cooling the electric parts are also used as the air blowing means for exhausting the air in the cooking chamber 2. However, instead of this, A configuration may be used in which a dedicated fan device for exhausting the air in the cooking chamber 2 is provided.

[0061]

As is apparent from the above description, the present invention has a configuration in which the operating time of the cleaning operation is set based on the detection output output from the gas sensor during and after cooking. The operation time of the operation becomes a time suitable for the amount of the food, and the excellent effect that the cleaning operation can be executed without excess or deficiency regardless of the amount of the food is obtained.

Further, even if the cleaning operation time is set based on the cooking time instead of the detection output from the gas sensor, the cleaning operation time is suitable for the heating time. Also in the above, the cleaning operation can be performed without excess or deficiency regardless of the length of the cooking time. Further, even if the weight sensor for detecting the weight of the food is provided and the operation time of the cleaning operation is set on the basis of the weight of the food, the operation time of the cleaning operation becomes a time suitable for the amount of the food. The cleaning operation can be performed just enough.

Furthermore, even if the cleaning operation operation time is set based on the detection output from the gas sensor immediately after the end of heating and after the elapse of a set time, the operation time of the cleaning operation is also the amount of the food. The time is suitable for the cooking time and the cooking time, and the same effect can be obtained. On the other hand, even when the cleaning operation is controlled to be executed until the detection output from the gas sensor reaches a predetermined ratio of the initial detection output after the heating and cooking are finished, the operation time of the cleaning operation is The time is suitable for the cooking time, and the same effect can be obtained.

[Brief description of drawings]

FIG. 1 is a flowchart showing a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of a microwave oven.

FIG. 3 is a schematic vertical sectional side view of a microwave oven.

FIG. 4 is a block diagram.

FIG. 5 shows a second embodiment of the present invention, and is a diagram showing the relationship between the cooking time and the cleaning operation time.

FIG. 6 is a diagram showing a third embodiment of the present invention and is a diagram showing the relationship between the amount of food and the cleaning operation time.

FIG. 7 shows a fourth embodiment of the present invention, and is a diagram showing changes in the output voltage of the alcohol sensor when drinking one drink.

FIG. 8 is a diagram corresponding to FIG. 7 when drinking 5 go of sake.

FIG. 9 is a view showing a fifth embodiment of the present invention, and is a diagram showing changes in the output voltage of the alcohol sensor when drinking one drink.

FIG. 10 is a diagram corresponding to FIG. 9 when drinking 5 go of sake.

[Explanation of symbols]

1 is a range main body, 2 is a cooking chamber, 5 is a magnetron,
6 is a cooling fan device (blowing means), 9 is a duct, 10 is a vent, 11 is an exhaust port, 12 is an exhaust duct, 13 is a gas sensor, 14 is an alcohol sensor (gas sensor), 19
Is a weight sensor, and 27 is a control circuit (operation control means, setting means, clocking means).

Claims (5)

[Claims] 1. A magnetron for heating a cooked food in a cooking chamber in a microwave oven, a gas sensor for detecting a gas generated from the cooked food, an air blowing unit for exhausting air in the heating cooking chamber, and the air blowing after the cooking is completed. An operation control means for driving the means to execute a cleaning operation for exhausting the air in the heating and cooking chamber, and an operating time of the cleaning operation based on a detection output outputted from the gas sensor during and after the heating and cooking. A microwave oven comprising setting means for setting. 2. A magnetron for heating a cooked food in a cooking chamber in a microwave oven, a gas sensor for detecting a gas generated from the cooked food, a clocking means for timing a cooking time from the start to the end of the cooking, and the heating. An air blower for exhausting air in the cooking chamber; an operation controller for driving the air blower after completion of heating to perform a cleaning operation for exhausting air in the heating chamber; and the cleaning based on the heating time. A microwave oven comprising: a setting means for setting a driving time of driving. 3. A magnetron for heating the cooked food in the cooking chamber in a microwave oven, a gas sensor for detecting a gas generated from the cooked food, a weight sensor for detecting the weight of the cooked food, and an air in the cooking chamber. Exhaust blower means, operation control means for driving the blower means after heating and exhausting the air in the cooking chamber to perform a cleaning operation, and operating time of the cleaning operation based on the weight of the food And a setting means for setting the microwave oven. 4. A magnetron for range-heating a cooked food in the heating cooking chamber, a gas sensor for detecting gas generated from the cooked food, an air blowing unit for exhausting air in the heating cooking chamber, and the air blowing after the cooking is completed. An operation control means for driving the means to execute a cleaning operation for exhausting the air in the heating and cooking chamber, and a cleaning operation of the cleaning operation based on the detection output from the gas sensor immediately after the end of the heating and the set time after that. A microwave oven comprising a setting means for setting an operating time. 5. A magnetron for range-heating a cooked food in a cooking chamber, a gas sensor for detecting gas generated from the cooked food, and a storage unit for storing an initial detection output from the gas sensor at the start of heating and cooking. An air-blowing means for exhausting the air in the heating cooking chamber, a cleaning operation for driving the air-blowing means to exhaust the air in the heating cooking chamber, and a detection output output from the gas sensor after completion of the heating and cooking is initially detected. A microwave oven comprising: an operation control means for executing the operation until a predetermined output ratio is reached.