JPH0960890A - Heating and cooking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a circulating supply of hot air in a heating chamber and to enable a food to be sufficiently dried by a method wherein a heating mode in which a heater and a hot air blowing fan device are driven and stopped in a synchronous manner and a heating mode in which the hot air blowing fan device is continued to be driven even during a period of stopping heater can be carried out. SOLUTION: A first heating mode is constituted such that a heater 6 and a hot air blowing fan device 7 are synchronously driven and stopped. That is, when a sensing temperature in a heating chamber 2 detected by a temperature sensor 12 reaches a heater-off temperature slightly higher than a set temperature, the heater 6 and the hot air blowing fan device 7 are turned off, and when the detected temperature in the heating chamber 2 is decreased to a heater-on temperature slightly lower than the set temperature, the heater 6 and the hot air blowing fan device 7 are turned on. Under the second heating mode, the heater 6 and the hot air blowing fan device 7 are driven and stopped in a non-synchronous manner, and the hot air blowing fan device 7 is continued to be driven even during a period of stopping the heater 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cooker configured to circulate hot air into a heating chamber by a heater and a hot air fan device to heat and cook food in the heating chamber.

[0002]

For example, in an electric oven, a structure in which hot air is circulated and fed into a heating chamber by a heater and a hot air fan device to raise the temperature in the heating chamber and heat food to cook the oven. Has become. In this case, when the temperature in the heating chamber reaches a heater off temperature slightly higher than the set temperature, the heater and the hot air fan device are turned off, and thereafter, when the temperature in the heating chamber drops to a heater on temperature slightly lower than the set temperature, The heater and the hot air fan device are driven. As described above, the heater and the hot air fan device are intermittently operated in synchronization with each other, so that the temperature in the heating chamber is substantially maintained at the set temperature. Then, by performing the synchronous operation of the heater and the hot air fan device, various foods desired to be cooked in the oven can be cooked generally well.

However, in the electric oven, for example, when cookies are cooked in the oven, there is a problem in that the cookies cannot be baked enough to be crispy, that is, the cookies cannot be dried sufficiently.

Therefore, an object of the present invention is to provide a heating cooker capable of sufficiently drying food when the food is cooked by circulating hot air into the heating chamber by the heater and the hot air fan device. is there.

[0005]

The cooking device according to the present invention comprises:
A heating chamber for containing food, a heater for generating hot air, a hot air fan device that circulates the hot air heated by the heater into the heating chamber, and a heating control for individually driving and controlling the heater and the hot air fan device. A first heating mode for synchronously driving and stopping the heater and the hot air fan device, and a second heating device for continuously driving the hot air fan device during a period in which the heater is stopped. It is characterized in that it is configured to be able to execute the heating mode and.

The present inventor has conducted various experiments in consideration of whether or not food can be sufficiently dried in a structure in which hot air is circulated and heated by a heater and a hot air fan device to heat and cook food. Then, in order to keep the temperature in the heating chamber at the set temperature, when the heater and the hot air fan device were intermittently operated, the food was cooked by continuing to drive the hot air fan device even while the heater was stopped. However, it was confirmed that the food after cooking was in a sufficiently dried state (a crispy state). The present invention has been made paying attention to this point.

That is, according to the heating cooker of the present invention, the first heating mode in which the heater and the hot air fan device are synchronously driven and stopped, and the second mode in which the hot air fan device is continuously driven even during the period in which the heater is stopped Since the above heating mode is executable, if the food is desired to be baked enough to be crispy, it can be dried sufficiently by heating the food in the second heating mode. Then, when the food is not desired to be dried so much, the food may be cooked in the first heating mode.

Further, in the case of the above construction, it is preferable that the heating control means selects the first heating mode or the second heating mode based on the set temperature of the heating chamber. In particular, it is a good configuration to execute the second heating mode when the set temperature of the heating chamber is equal to or higher than the predetermined temperature. Further, it is also preferable that the heating control means selects the first heating mode or the second heating mode based on the cooking item.

Furthermore, it is also a good configuration to include a selection key for selecting the first heating mode or the second heating mode. It is also a preferable configuration to select the first heating mode or the second heating mode based on the detection result of the sensor.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which the present invention is applied to a microwave oven will be described below with reference to the drawings. First, in FIG. 2 schematically showing the overall configuration of the microwave oven, a heating chamber 2 is provided in a main body 1 of the microwave oven.
Are arranged. The heating chamber 2 is provided on the front surface of the main body 1.
Is provided with a door 3 for opening and closing the front opening. Also,
In the heating chamber 2, two top plates (oven dishes) 4 for oven cooking are housed so that they can be taken in and out vertically in two stages.
Food is placed on these top plates 4.

A hot air generating unit 5 is arranged on the rear surface of the heating chamber 2. This hot air generating unit 5
Is composed of a heater 6, a hot air fan device 7, and a casing 8. The hot air fan device 7 includes a fan 9 and a fan motor 10. The heater 6 and the fan 9 are covered with the casing 8.
Here, in the rear wall portion 11 of the heating chamber 2, an intake port 11a having a large number of small holes is formed in the central portion, and discharge ports 11b, 11b having a large number of small holes are formed in the upper and lower portions. In this case, when the hot air fan device 7 is driven, the air in the heating chamber 2 is sucked from the intake port 11a, and the sucked air is heated by the heater 6 to form hot air, which is then discharged. The air is blown into the heating chamber 2 through the outlets 11b and 11b, and thus hot air is circulated and supplied into the heating chamber 2.

By circulating and supplying the hot air into the heating chamber 2 in this manner, the food placed on the top plate 4 is oven-heated. A temperature sensor 12 (see FIG. 3) that detects the temperature inside the heating chamber 2 (internal temperature) is provided in the heating chamber 2.

On the other hand, a machine room (not shown) is provided on the right side of the heating room 2 in the main body 1, and a magnetron 13 (see FIG. 3) is arranged in the machine room.
This magnetron 13 supplies microwaves into the heating chamber 2 through a waveguide (not shown),
The food is cooked in a microwave oven. A turntable (not shown) for range cooking is rotatably and detachably provided at the inner bottom of the heating chamber 2, and the food is placed on the turntable. The turntable is configured to be rotationally driven by an RT motor 14 (see FIG. 3) provided on the outer bottom of the heating chamber 2.

An operation panel (not shown) is provided at the right end of the front surface of the main body 1 (front part of the machine room). On this operation panel, various switches 15 (see FIG. 3) and various indicators 16 (see FIG. 3) for setting cooking items (cooking menu), cooking course, cooking time, set temperature in the heating chamber 2 and the like. (See) is provided.

Now, FIG. 3 schematically shows the electrical construction of the microwave oven having the above construction. In FIG. 3, two power lines 18 and 19 are led out from a power plug 17 connected to a power outlet of an AC power source. Between the power supply lines 18 and 19, a series circuit including the relay switch 20a of the heater 6 and the heater relay 20 and a series circuit including the relay switch 21a of the fan motor 10 and the fan motor relay 21 are connected in parallel. . A door switch 22 is provided at a portion of the power line 18 closer to the power plug 17 than the connection point of the fan motor 10.
Is provided. The door switch 22 is a switch that is turned on when the door 3 is closed and turned off when the door 3 is opened. A relay switch 23a of the main relay 23 is provided at a portion of the power line 19 closer to the power plug 17 than a connection point of the relay switch 21a of the fan motor relay 21.

Further, the above-mentioned three relays 20, 21, 23
Is configured to be driven and controlled by a heating control means such as a control circuit 24. Specifically, the control circuit 24 performs the on / off control of the exciting coils 20b, 21b, 23b of the three relays 20, 21, 23, so that the relay switches 20 of the relays 20, 21, 23 are turned on and off.
The configuration is such that a, 21a, and 23a are on / off controlled. Accordingly, the control circuit 24 can drive and control the heater 6 and the fan motor 10 (hot air fan device 7) separately. The control circuit 24 is configured to include, for example, a microcomputer, has a function of controlling the entire heating and cooking operation of the microwave oven, and stores a program therefor.

The control circuit 24 controls the drive of the magnetron 13 via the drive circuit 25, the drive control of the RT motor 14 via the drive circuit 26, and the drive circuit 27 to display various indicators on the operation panel. 16 is configured to be driven and controlled. Further, the control circuit 24 uses the switch signals from the various switches 15 on the operation panel, the temperature detection signal from the temperature sensor 12, and the weight from the weight sensor 28 that detects the weight of the food on the turntable or the point plate 4. A detection signal, a gas detection signal from a gas sensor 29 that detects gas such as water vapor generated from food, an alcohol detection signal from an alcohol sensor 30 that detects alcohol gas generated from food, and, for example, light that detects the shape of food. It is configured to receive a shape detection signal from a shape sensor 31 including a sensor.

Next, referring to FIGS. 1, 4 and 5, the operation of the above-described structure, in particular, the operation of oven cooking in which the hot air is circulated and heated by the heater 6 and the hot air fan device 7 into the heating chamber 2 for cooking And explain. When performing the above-mentioned oven cooking, the control circuit 24 of the present embodiment is configured to be able to perform heating cooking in two types of heating modes. First, the first heating mode will be described. This first heating mode is the same as the heating operation mode of conventionally known oven cooking, and as shown in FIG. 1A, the heater 6 and the hot air fan device 7 (fan motor 10) are driven synchronously. And configured to stop.

Specifically, in the first heating mode, when the temperature detected by the temperature sensor 12 in the heating chamber 2 reaches a heater off temperature slightly higher than the set temperature, the heater 6 and the hot air fan device 7 are turned off (stopped). ), After this, heating chamber 2
The heater 6 and the hot air fan unit 7 are turned on (driven) when the detected temperature inside falls to a heater on temperature slightly lower than the set temperature. In this way, the heater 6 and the hot air fan device 7 are synchronously operated intermittently to maintain the temperature in the heating chamber 2 at the set temperature. The above set temperature is the temperature manually set by the user by operating the temperature setting switch,
Alternatively, the temperature is automatically set to best suit the set cooking menu.

FIG. 4 shows a temperature change in the heating chamber 2 when the oven cooking is performed in the first heating mode.
In FIG. 4, a solid line P is a temperature change in a lower surface rear portion A portion (a portion near the hot air outlet 11b) of the lower ceiling plate 4 shown in FIG. 2, and a solid line Q is a lower surface front portion of the lower ceiling plate 4. This is the temperature change of the B part (the part far from the hot air exhaust port).

Next, the second heating mode will be described. In the second heating mode, as shown in FIG. 1B, the heater 6 and the hot air fan device 7 are driven and stopped asynchronously, and specifically, the hot air fan device is also operated during the period in which the heater 6 is stopped. 7 is configured to continue to be driven. That is, in the second heating mode, when the temperature detected by the temperature sensor 12 inside the heating chamber 2 reaches a heater off temperature slightly higher than the set temperature, the heater 6 is turned off (stopped), and then the inside of the heating chamber 2 is stopped. When the detected temperature falls to a heater ON temperature slightly lower than the set temperature, the heater 6 is turned on (driven), and the hot air fan device 7 is continuously turned on (driven) even when the heater 6 is turned off. There is.

As described above, the heater 6 is intermittently operated so that the temperature in the heating chamber 2 is maintained at the set temperature. FIG. 5 shows a temperature change in the heating chamber 2 when the oven cooking is executed in the second heating mode. In FIG. 5, the solid line P represents the temperature change of the lower surface rear portion A of the lower top plate 4 shown in FIG. 2, and the solid line Q represents the temperature change of the lower surface front portion B of the lower top plate 4. Comparing FIG. 5 and FIG. 4 described above, it can be seen that the temperature unevenness in the heating chamber 2 in the second heating mode is smaller than that in the first heating mode. In this case, the uneven baking becomes smaller. It was experimentally confirmed that when the oven cooking is performed in the second heating mode, the food can be cooked to a crisp state (fully dried state).

In the present embodiment, the two heating modes are selected and executed as described below. First, the control circuit 24 is configured to select the first heating mode or the second heating mode based on the set temperature of the heating chamber 2. Specifically, the second heating mode is automatically selected and executed when the set temperature of the heating chamber 2 is a predetermined temperature, for example, 225 ° C. or higher. In this case, the oven cooking in which the set temperature is set high is cooking of frying (fried food) or food such as cookies, and it is preferable that the food is cooked to a crispy state (fully dried state). Therefore, since the second heating mode is automatically selected and executed when the set temperature is high (for example, 225 ° C. or higher), foods such as fries and cookies should be cooked until they become crispy. It is possible to improve the baking of food.

In the oven cooking in which the set temperature is not too high, it is preferable to finish the heating cooking in a state where the food is not dried so much. In this case, the first heating mode is automatically selected and executed when the set temperature is not too high (for example, when the temperature is lower than 225 ° C), so that the food is heated in a dry state (without dryness). Cooking can be completed, and baking of the food is preferable.

Further, in the above embodiment, the control circuit 24 is configured to automatically select the first heating mode or the second heating mode based on the cooking item set by the user. Specifically, it is configured to select and execute the second heating mode when a cooking menu for baking fries, cookies, etc. is set as a cooking item (cooking menu). Also in the case of this configuration, it is possible to reliably heat and cook foods such as fries and cookies until they become crispy.

Further, in the above embodiment, the operation panel is provided with a selection key for selecting the first heating mode or the second heating mode. In this case, when the user wants to cook the food until the food becomes crispy, the selection key is operated to select the second heating mode, while when the user wants to finish the heating cooking without drying the food, the selection key May be operated to select the first heating mode. By doing so, the baked state of the food can be brought to a desired state desired by the user.

Furthermore, the control circuit 24 of the present embodiment automatically detects the cooking item (cooking menu) based on the detection results of the various sensors 12, 28, 29, 30, 31 and detects the detected cooking. It has a function (full-automatic cooking function) to execute the optimum cooking for the item. When the cooking function is executed, the control circuit 24
Automatically selects the first heating mode or the second heating mode based on the detection results of the various sensors 12, 28, 29, 30, 31, that is, depending on the detected cooking item. It is configured. Specifically, it is configured to select the second heating mode when the detected cooking item is a baking item such as a fried food or a cookie, and to select the first heating mode otherwise. There is. Therefore, even when the automatic cooking function is selectively executed, the baked state of the food can be made more preferable.

[0028]

As is apparent from the above description, the present invention drives the hot air fan device during the first heating mode in which the heater and the hot air fan device are synchronously driven and stopped, and during the period in which the heater is stopped. Since the second heating mode to be continued is configured to be executable, when the food is desired to be baked enough to be crispy, it is possible to sufficiently dry the food by heating the food in the second heating mode. It has an excellent effect.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, in which (a) is a time chart of a first heating mode and (b) is a time chart of a second heating mode.

[Fig. 2] Vertical side view of the microwave oven

FIG. 3 is an electric circuit diagram of a microwave oven.

FIG. 4 is a graph showing a temperature change in the heating chamber during cooking in the first heating mode.

FIG. 5 is a graph showing a temperature change in the heating chamber during cooking in the second heating mode.

[Explanation of symbols]

1 is a main body, 2 is a heating chamber, 4 is a top plate, 5 is a hot air generating unit, 6 is a heater, 7 is a hot air fan device, 8 is a casing, 9 is a fan, 10 is a fan motor, 11 is a rear wall portion,
11a is an intake port, 11b is a discharge port, 12 is a temperature sensor,
24 is a control circuit (heating control means), 28 is a weight sensor,
29 is a gas sensor, 30 is an alcohol sensor, and 31 is a shape sensor.

Claims (6)

[Claims] 1. A heating chamber for containing food, a heater for generating hot air, a hot air fan device for circulating hot air heated by the heater into the heating chamber, and the heater and the hot air fan device separately. A heating control means for driving and controlling the heating control means, wherein the heating control means drives and stops the heater and the hot air fan device in synchronization with each other;
A heating cooker characterized by being configured to be capable of executing a second heating mode in which the hot air fan device is continuously driven even during a period in which the heater is stopped. 2. The heating cooker according to claim 1, wherein the heating control means selects the first heating mode or the second heating mode based on the set temperature of the heating chamber. 3. The heating cooker according to claim 2, wherein the heating control means executes the second heating mode when the set temperature of the heating chamber is equal to or higher than a predetermined temperature. 4. The heating cooker according to claim 1, wherein the heating control means selects the first heating mode or the second heating mode based on the cooking item. 5. The heating cooker according to claim 1, further comprising a selection key for selecting a first heating mode or a second heating mode. 6. The heating cooker according to claim 1, wherein the heating control means selects the first heating mode or the second heating mode based on the detection result of the sensor.