JPH0968316A - Thermally cooking apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable cooking of may materials to be cooked at a time by providing a fan in a cooking chamber to generate at least there groups of circulation air as the air in the cooking chamber is sucked to be discharged into the cooking chamber while a heater is provided to heat the air passing through air paths. SOLUTION: In an electronic oven range with an oven cooking function, rack parts for mounting square trays 17 by four stages in a cooking chamber 14 are arranged on side walls of an inner case 13 vertically by four stages while a fan 19 is provided on an inner wall of the cooking chamber 14. In other words, a large-diameter external easing 20 is mounted on the inner wall of the cooking chamber 14 and a centrifugal type large-diameter fan 22 is housed therein while a small-diameter internal easing 24 is housed in the external casing 20 and a centrifugal small-diameter fan 25 is housed thereinto to be rotated by a common rotation mechanism 273 Heaters 34b and 34a are arranged in the respective casings 20 and 24, air sucked at an air suction part 60 is heated and then, discharged into the cooking chamber 14 from exhaust parts 29a and 29b and 32a and 32b.

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 heat and cook a food item by circulating hot air in a cooking chamber.

[0002]

An example of this kind of cooking device is a microwave oven having an oven cooking function. As shown in FIG. 15, this microwave oven has a configuration in which a ventilation device 2 and a heater 3 are provided on the back of the cooking chamber 1, and when the centrifugal fan 2a of the ventilation device 2 rotates, the intake port 1a from inside the cooking chamber 1 is rotated. Air is sucked into the casing 4 through the air, and after this air is hot-aired by the heater 3,
The gas is discharged into the cooking chamber 1 through the exhaust ports 1b and 1c. As a result, as shown by the arrows, a hot air flow wrapping the upper cooking dish 5 and a hot air flow wrapping the lower cooking dish 5 are generated, and the food on each cooking dish 5 is cooked in the oven.

However, in the above conventional structure, only two hot air flows are generated, so that only two cooking dishes 5 can be accommodated at the maximum. Therefore, when a large number of cooked foods such as cookies are baked at one time, there is an inconvenience of performing heating cooking in two times.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a heating cooker capable of cooking a large number of foods at once.

[0005]

A cooking device according to claim 1 has two intake / exhaust parts consisting of an intake part and an exhaust part, and sucks air in the cooking chamber from the intake part of each intake / exhaust part. 3 in the cooking chamber due to discharge from the exhaust unit into the cooking chamber
A blower that generates one or more circulating winds, and each of the circulating winds is heated by heating the air flowing through each ventilation passage, which is provided in the ventilation passage that extends from the intake portion to the exhaust portion of each of the intake and exhaust portions. The present invention is characterized in that it includes a heating device that changes into heat and a cooking dish mounting unit that arranges each cooking dish in the circulating air when three or more cooking dishes are mounted in the cooking chamber.

According to the first aspect of the invention, when three or more cooking dishes are set in the cooking chamber and the blower and the heating device are operated, the air in the cooking chamber is blown from the intake part of each intake / exhaust part. After being sucked in and heated by the heating device, the air is discharged into the cooking chamber from the exhaust part of each intake / exhaust part. Thereby, three or more hot air circulates in the cooking chamber, and each cooking dish is wrapped with the hot air. Therefore, a large number of food items are heated and cooked at once as compared with the conventional case in which the cooking plates are mounted in two stages.

In the heating cooker according to a second aspect of the present invention, the blower device has an inner casing provided on the wall of the cooking chamber, and a centrifugal small-diameter fan housed in the inner casing.
An outer casing provided on the chamber wall of the cooking chamber so as to cover the inner casing, and a centrifugal large-diameter fan housed in the outer casing coaxially with the small-diameter fan. An air-intake part of one of the blowers, an exhaust part including an upper exhaust port and a lower exhaust port provided in a chamber wall of the cooking chamber corresponding to upper and lower parts of the outer casing, and a center of the outer casing. And a second intake port provided on the chamber wall of the cooking chamber so as to correspond to the first intake port and the first intake port. The other air intake / exhaust part of the blower device has an exhaust part including a central upper exhaust port and a central lower exhaust port provided in a chamber wall of the cooking chamber corresponding to upper and lower parts of the inner casing, and the inner casing. Corresponding to the center of the front The heating device includes an inner heat source arranged in an air passage in the inner casing and an air intake portion formed in an air inlet provided in a wall of the cooking chamber, and arranged in an air passage in the outer casing. It is characterized in that it is composed of an external heat source.

According to the second aspect of the invention, when the small diameter fan rotates, air is sucked into the inner casing from the intake port provided in the chamber wall of the cooking chamber, and this air is used as the inner heat source in the inner casing. After being heated by the above, it is blown into the cooking chamber through the central upper exhaust port and the central lower exhaust port provided on the wall of the cooking chamber. Thereby, two hot air circulates in the cooking chamber. When the large-diameter fan rotates, air is sucked into the outer casing from the second intake port provided in the chamber wall of the cooking chamber through the first intake port provided in the inner casing, and the air is sucked into the outer casing. After being heated by the outside heat source inside, it is blown into the cooking chamber through the upper exhaust port and the lower exhaust port provided on the wall of the cooking chamber. Thereby, two hot air circulates in the cooking chamber. Therefore, since four hot air circulates in the cooking chamber, many foods are cooked at once.

According to a third aspect of the present invention, there is provided a heating cooker which is attached to a wall of a cooking chamber so that one end thereof corresponds to the second intake port and the other end thereof corresponds to the first intake port. It is characterized in that it is provided with a tubular member for guiding the air in the cooking chamber from the second intake port to the first intake port as the fan rotates.

According to another aspect of the present invention, there is provided a heating cooker which is attached to a central portion of a small diameter fan such that one end thereof corresponds to the second intake port and the other end thereof corresponds to the first intake port. It is characterized in that it is provided with a tubular member for guiding the air in the cooking chamber from the second intake port to the first intake port as the large fan rotates.

According to the means described in claims 3 and 4, when the large-diameter fan rotates, the air in the cooking chamber is guided from the second intake port through the inside of the tubular member to the first intake port, and the first intake port is introduced. It is sucked into the outer casing through the intake port. Therefore, the ventilation passage for sucking air from the cooking chamber into the outer casing and the ventilation passage for sucking air from the cooking chamber into the inner casing are separated, so that the blowing operation by the large diameter fan and the small diameter fan is smoothed. It

A heating cooker according to a fifth aspect is characterized in that it has a rotating mechanism for independently rotating a small-diameter fan and a large-diameter fan. According to the means described in claim 5, since the small diameter fan and the large diameter fan rotate independently, the mode in which only the small diameter fan rotates, the mode in which only the large diameter fan rotates, and both fans rotate. You can set the mode and.

According to a sixth aspect of the present invention, there is provided a heating cooker including a heat source control means for driving and controlling a heat source provided in one ventilation passage of the air blower and a heat source provided in the other ventilation passage. The heat source is controlled so that the ON time of the one heat source is shorter than the ON time of the other heat source. According to the means of claim 6,
Since the on-time of one heat source is shorter than the on-time of the other heat source, the temperature in the cooking chamber is made uniform even though the predetermined circulating air is easily sandwiched between the remaining circulating air and becomes hot. .

According to a seventh aspect of the present invention, there is provided a heating cooker provided with a heat source control means for driving and controlling a heat source provided in one ventilation passage of the blower and a heat source provided in the other ventilation passage. The heat source is controlled so that the one heat source and the other heat source are not turned off at the same time. According to the measure described in claim 7, it is possible to prevent one heat source and the other heat source from being turned off at the same time. Therefore, since hot air is constantly supplied to the cooking chamber, the temperature inside the cooking chamber is prevented from lowering.

In the heating cooker according to the present invention, the hot air temperature detecting means for detecting the temperature of the hot air formed by the heat source provided in one air passage of the air blower and the other air passage of the air blower. Where the hot air temperature detection means for detecting the temperature of the hot air formed by the heat source provided, and the heat source control means for driving and controlling each of the heat sources based on the detection signals from the both hot air temperature detection means. It has characteristics.

According to the means of claim 8, each heat source is drive-controlled based on the temperature of the hot air formed by one heat source and the temperature of the hot air formed by the other heat source. Therefore, each heat source is drive-controlled to reduce the temperature difference between the two hot air streams, so that the temperature inside the cooking chamber is made uniform.

According to a ninth aspect of the present invention, there is provided a heating cooker in which hot air temperature detecting means for detecting a temperature of hot air formed by a heat source provided in one air passage of the air blower and another air passage of the air blower are provided. Hot air temperature detecting means for detecting the temperature of the hot air formed by the heat source provided, cold room temperature detecting means for detecting the cold room temperature of the cooking chamber, detection signals from the hot air temperature detecting means and the cold room A heat source control means for driving and controlling the heat sources based on a detection signal from the temperature detection means is provided.

According to the means of claim 9, each heat source is drive-controlled based on the temperature of the hot air formed by one heat source, the temperature of the hot air formed by the other heat source, and the inside temperature. As a result, the temperature inside the cooking chamber is made more uniform.

[0019]

1 to 6 show a first embodiment of the present invention.
It will be described based on. In addition, this Example applies this invention to the microwave oven with an oven cooking function. First, in FIG. 1, the microwave oven main body 11 is one in which an inner box 13 is arranged inside an outer box 12, and the inside of the inner box 13 functions as a cooking chamber 14. Further, a door 15 is pivotally supported on the outer box 12, and the cooking chamber 14
The front opening is opened and closed as the door 15 rotates.

As shown in FIG. 2, a magnetron 16 is arranged in the microwave oven main body 11. The magnetron 16 is connected to the cooking chamber 14 through the waveguide 16a, and when the magnetron 16 operates, microwaves are radiated into the cooking chamber 14 through the waveguide 16a,
Range cooking is performed. A turntable (not shown) is provided at the bottom of the cooking chamber 14, and when performing range cooking, the food is placed on the turntable and microwaves are generated while rotating the turntable. Irradiate.

On both side walls of the inner box 13, there are provided cooking dish mounting portions 18 for mounting the square dishes 17 (corresponding to cooking dishes) in four steps in the cooking chamber 14. This cooking dish mounting part 1
8 is upper shelves 18a and 18a, central upper shelves 18
b and 18b, the central lower shelves 18c and 18c, and the lower shelves 18d and 18d. When the food is cooked in the oven, the square plate 17 is used for each shelves 1
8a to 18d are selectively placed.

An air blower 19 is provided on the back wall of the cooking chamber 14 as shown in FIG. Below, blower 1
9 will be described in detail. An outer casing 20 having a large diameter is attached to the inner wall of the cooking chamber 14,
As shown in FIG. 3, the outer ring of the bearing 21 is fixed to 0. A centrifugal large-diameter fan 22 is housed in the outer casing 20. This large fan 2
2 has a hollow rotating shaft 22a, and this rotating shaft 22a is press-fitted into the inner ring of the bearing 21.

A large fan motor 23 is arranged inside the outer box 12 at the back of the outer casing 20, and a gear 23b is fixed to a rotary shaft 23a of the large fan motor 23. A gear 22b is fixed to the rotary shaft 22a of the large-diameter fan 22. And the large-diameter fan 22
Gear 22b of the large fan motor 23 meshes with the gear 23b of the large fan motor 23.
When b is rotated, the rotation of the gear 23b is transmitted to the rotary shaft 22a via the gear 22b. As a result, the inner ring of the bearing 21 slides with respect to the outer ring, and the large-diameter fan 22 rotates about the rotation shaft 22a.

An inner casing 24 having a small diameter is housed inside the outer casing 20. The inner casing 24 is attached to the inner wall of the cooking chamber 14, and a centrifugal small fan 25 is accommodated in the inner casing 24. In addition, inside the outer box 12, the outer casing 2
The small fan motor 26 is disposed at the back of the small fan motor 26, and the rotation shaft 26a of the small fan motor 26 has a large diameter fan 2
It is connected to the small diameter fan 25 through the two rotating shafts 22a (that is, the large diameter fan 22 and the small diameter fan 25 are arranged coaxially). Therefore, the small fan motor 26
Is activated, the small diameter fan 25 rotates.

The rotating mechanism 27 is the gear 2 of the large-diameter fan 22.
2b, a large fan motor 23, a gear 23b of the large fan motor 23, and a small fan motor 26. When the large fan motor 23 operates, the mode is switched to a mode in which only the large-diameter fan 22 is rotated. Fan motor 2
6 is switched to a mode in which only the small-diameter fan 25 is rotated, and both fan motors 23 and 26 are switched to a mode in which both fans 22 and 25 are rotated.

An intake / exhaust section 28 for a small-diameter fan 25 is provided on the back wall of the cooking chamber 14. This intake / exhaust part 28
Is an exhaust part 29 including a central upper exhaust port 29a and a central lower exhaust port 29b corresponding to the upper and lower parts of the inner casing 24.
And the intake port 30 corresponding to the central portion of the inner casing 24
2 and the air intake portion 30 made of a.
As shown in FIG. 2, the central upper exhaust port 29a is disposed between the upper shelf part 18a and the central upper shelf part 18b, and the central lower exhaust port 2a.
9b is arrange | positioned between the lower side shelf part 18d and the center lower side shelf part 18c, and the air inlet 30a is arrange | positioned between the center upper side shelf part 18b and the center lower side shelf part 18c (center part of the cooking chamber 14). Has been done.

Accordingly, in FIG. 1, when the small-diameter fan 25 rotates, the air in the cooking chamber 14 is sucked into the inner casing 24 from the intake port 30a, and the central upper exhaust port 29a and the central lower exhaust port 29b exhaust the cooking chamber. It is discharged into 14. As a result, as shown by the arrow, 2
Two circulating winds are generated, and the central upper plate 17 mounted on the central upper shelf 18b and the central lower plate 17 mounted on the central lower shelf 18c are wrapped by the circulating air.

As shown in FIG. 3, an intake / exhaust portion 31 for the large-diameter fan 22 is provided on the back wall of the cooking chamber 14. The intake / exhaust portion 31 is provided with an exhaust portion 32 including an upper exhaust port 32a and a lower exhaust port 32b corresponding to the upper and lower portions of the outer casing 20, and a first exhaust port 32 provided in the inner casing 24 corresponding to the central portion of the outer casing 20. Intake port 33a of 1
And an intake section 33 including an intake port 30a (corresponding to a second intake port) corresponding to the first intake port 33a. As shown in FIG. 2, the upper exhaust port 32a has an upper side. The lower exhaust port 32b is arranged on the upper side of the shelf 18a, and the lower exhaust port 32b is arranged on the lower side of the lower shelf 18d. The first intake port 33a also serves as an insertion hole through which the rotary shaft 26a of the small fan motor 26 is inserted.

Therefore, in FIG. 1, when the large-diameter fan 22 rotates, the air in the cooking chamber 14 is sucked from the intake port 30a into the outer casing 22 through the inner casing 24 and the first intake port 33a, and the upper exhaust port is opened. The gas is discharged into the cooking chamber 14 through the lower exhaust port 32a and the lower exhaust port 32b. As a result, as shown by the arrow, two circulating winds are generated in the cooking chamber 14, and the upper square plate 17 attached to the upper shelf 18a.
The lower square plate 17 attached to the lower shelf 18d is wrapped with the circulating air. The upper exhaust port 32a, the central upper exhaust port 29a, the intake port 30a, the central lower exhaust port 29b, and the lower exhaust port 32b are punching holes having many small holes. The blower device 19 is configured as described above.

In the ventilation passage 24a of the inner casing 24,
An inner heater 34a corresponding to an inner heat source is provided. The inner heater 34a has an annular shape as shown in FIG. 4, and heats the air discharged from the central upper exhaust port 29a and the central lower exhaust port 29b in FIG. As a result, the central upper plate 17 and the central lower plate 1
Circulating air that wraps 7 is heated.

In the ventilation passage 20a of the outer casing 20,
An outer heater 34b corresponding to an outer heat source is provided. The outer heater 34b has an annular shape as shown in FIG. 4, and heats the air discharged from the upper exhaust port 32a and the lower exhaust port 32b in FIG. As a result, the circulating air that wraps the upper square plate 17 and the lower square plate 17 is turned into hot air. Reference numeral 34 is a heating device including an inner heater 34a and an outer heater 34b.

The control device 35 in FIG. 5 corresponds to a heat source control means, and is mainly composed of a microcomputer. This control device 35 has a cooking mode selection key 3
6a, a start key 36b, and an oven heating mode selection key 36c are connected. These keys 36a to 36
c is provided on the operation panel 36 located on the front surface of the microwave oven main body 11, and the control device 35 controls the range cooking according to the operation content of the cooking mode selection key 36a.
Determine which of the oven cooking options was selected. In addition, depending on the operation content of the oven heating mode selection key 36c, either the mode in which only the large diameter fan 22 is rotated, the mode in which only the small diameter fan 25 is rotated, or the mode in which the large diameter fan 22 and the small diameter fan 25 are rotated. Is selected.

The control device 35 is connected to the magnetron 16, the large fan motor 23, the outer heater 34b, the small fan motor 26, and the inner heater 34a.
When detecting that the range cooking is selected, 5 supplies power to the magnetron 16 in accordance with the operation of the start key 36b and irradiates the inside of the cooking chamber 14 with microwaves.

Next, the operation of the above configuration will be described. When performing the oven cooking, first, the upper shelf 18
After placing the square plate 17 on a, the central upper shelf 18b, the central lower shelf 18c, and the lower shelf 18d, the cooked food is placed on the rectangular plate 17. Next, the oven cooking is selected by the cooking mode selection key 36a, and the oven heating mode selection key 36 is selected.
After the mode for rotating the large diameter fan 22 and the small diameter fan 25 is selected by c, the start key 36b is operated. Then, the control device 35 performs oven cooking while on / off controlling the large fan motor 23, the outer heater 34b, the small fan motor 26, and the inner heater 34a until the set time has elapsed.

FIG. 6 is a time chart showing the control contents of the inner heater 34a and the outer heater 34b. As shown in the figure, when the control device 35 starts the oven cooking, first, the inside heater 34a and the outside heater 34b.
To turn on the heaters 34a and 34b, the inner heater 34a is turned off at time T1a, and the time T1a is turned on.
The outer heater 34b is turned off at 1b.

When the inner heater 34a and the outer heater 34b are turned off, the control device 35 turns off both heaters 3 at time T2.
4a and 34b are turned on at the same time. And time T2a
The inner heater 34a is turned off at, and the outer heater 3 is turned on at time T2b.
After turning off 4b, the operation is repeated until the set time elapses.

The controller 35 turns on the small fan motor 26 in synchronism with the turning on of the inner heater 34a and turns on the large fan motor 23 in synchronism with the turning on of the outer heater 34b. Flow of hot air wrapping the square plate 17 placed on 18a, flow of hot air wrapping the square plate 17 placed on the central upper shelf 18b, central lower shelf 18c
Flow of hot air wrapping the square plate 17 placed on the lower shelf 1
A flow of hot air that encloses the square plate 17 placed on 8d is generated.

Further, when the control device 35 detects that the mode for rotating only the large diameter fan 22 is selected by the oven heating mode selection key 36c after detecting the selection of the oven cooking, the large fan motor 23 and the outside are detected. The heater 34b is drive-controlled to perform oven cooking with two circulating winds. When it is detected that the mode for rotating only the small diameter fan 25 is selected by the oven heating mode selection key 36c, the small fan motor 26 and the inner heater 34a are drive-controlled to perform oven cooking with two circulating air.

According to the above-described embodiment, four hot air flows are formed in the cooking chamber 14 by operating the blower 19 and the heating device 34, and the upper square plate 17 and the central upper square plate 17 are formed. The central lower plate 17 and the lower plate 17 are wrapped in hot air. Therefore, a large number of foods are cooked in the oven at one time, as compared with the conventional case where the cooking plates are set in two stages in the cooking chamber 14.

By the way, since the two circulating winds formed by the small-diameter fan 25 are sandwiched between the two circulating air formed by the large-diameter fan 22, heat is accumulated in the central portion of the cooking chamber 14, and the central upper stage. Also, there is a circumstance in which the lower central square plate 17 is easily heated. On the other hand, as the inner heater 34a is turned off before the outer heater 34b is turned off, the on / off ratio of the inner heater 34a is changed to the on / off ratio of the outer heater 34b.
It is smaller than the off ratio. Therefore, the ON time of the inner heater 34a is shorter than the ON time of the outer heater 34b, so that the amount of hot air discharged from the small diameter fan 25 is suppressed,
As a result, the temperature inside the cooking chamber 14 is made uniform. Therefore, since the cooked food on each square plate 17 is heated uniformly, the finished state of the cooked food is also made uniform.

Further, the rotating mechanism 27 allows the large-diameter fan 22.
And the small diameter fan 25 is rotated independently. Therefore, for example, when the square plates 17 are set only in the upper and lower stages or when the amount of food is small, the mode in which only the large diameter fan 22 is rotated is selected to perform oven cooking with a small amount of hot air, Alternatively, the square plate 17
Is set only in the central upper stage and the central lower stage, it is possible to rotate only the small diameter fan 25 to supply hot air only to the central upper stage square plate 17 and the central lower stage square plate 17, so that Efficient oven cooking is performed as compared with the case where the fan motors 23 and 26 are always energized,
As a result, power consumption is reduced.

Next, a second embodiment of the present invention will be described with reference to FIGS.
It will be described based on. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Hereinafter, only different members will be described. First, in FIG. 8, the back wall of the cooking chamber 14 is provided with a second intake port 33b located at the center. This second intake port 33b
Together with the first intake port 33a constitute an intake part 33A for the large-diameter fan 22, and the intake ports 30a for the small-diameter fan 22 are arranged on both sides of the second intake port 33b.

As shown in FIG. 7, a cylindrical tubular member 37 is attached to the back wall of the cooking chamber 17 at the back surface thereof. As shown in FIG. 8, the tubular member 37 is fixed to the back wall so that its left end corresponds to the second intake port 33b for the large-diameter fan 22, and the right end of the tubular member 37. Is the first for the large-diameter fan 22, as shown in FIG.
Corresponding to the intake port 33a. The second intake port 33
b consists of a plurality of punching holes.

According to the above embodiment, when the large-diameter fan 22 and the small-diameter fan 25 rotate, the air in the cooking chamber 14 passes from the second intake port 33b through the inside of the tubular member 37 and the first intake port 33a. It is sucked into the outer casing 20. At the same time, the air in the cooking chamber 14 is sucked into the intake port 30a,
It is sucked into the inner casing 26 from 30a. Therefore, the air passage for sucking air from the cooking chamber 14 into the outer casing 20 and the air passage for sucking air from the cooking chamber 14 into the inner casing 26 are separated.
The blowing operation by the large diameter fan 22 and the small diameter fan 25 is smoothed. Therefore, the amount of hot air circulating in the cooking chamber 14 increases, and as a result, cooking performance is improved.

Next, a third embodiment of the present invention will be described with reference to FIG. The same members as those in the second embodiment are denoted by the same reference numerals, and description thereof will be omitted. Hereinafter, only different members will be described. A tubular member 37 is attached to the center of the small diameter fan 25. The tubular member 37 is arranged coaxially with the small-diameter fan 25.
Has a left end corresponding to the second intake port 33b for the large-diameter fan 22, and a right end part of the first intake port 33a for the large-diameter fan 22.
It corresponds to.

According to the above embodiment, when the large-diameter fan 22 and the small-diameter fan 25 rotate, the air in the cooking chamber 14 passes from the second intake port 33b through the inside of the tubular member 37 and the first intake port 33a. It is sucked into the outer casing 20. Therefore, since the air passage for sucking air from the cooking chamber 14 into the outer casing 20 and the air passage for sucking air from the cooking chamber 14 into the inner casing 26 are separated, the hot air circulating in the cooking chamber 14 is separated. The amount is increased, resulting in improved cooking performance.

In the second embodiment, the cooking chamber 1
Although the tubular member 37 is attached to the inner wall of No. 4 and the tubular member 37 is attached to the small diameter fan 25 in the third embodiment, the present invention is not limited to this. A short tubular member is attached to the small-diameter fan 25, and the two tubular members allow the second intake port 33b to the first intake port 33a to be attached.
It may be configured to guide the wind to.

Next, a fourth embodiment of the present invention will be described with reference to FIG. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Hereinafter, only different members will be described. When the controller 35 starts the oven cooking in the mode in which the large diameter fan 22 and the small diameter fan 25 are rotated, first, both the heaters 34a and 34b are turned on in order to start up the inner heater 34a and the outer heater 34b, The inner heater 34a is turned off at time Ta. Next, at time Tb, the inner heater 34a is turned on and the outer heater 34b is turned off. Then, the inner heater 34a is turned off and the outer heater 34b is turned on (time T
c), ON of the inner heater 34a and outer heater 34b
Is turned off (time Td) is repeated.

The control device 35 turns on the small-diameter fan 25 and the large-diameter fan 22 by turning on the small fan motor 26 and the large fan motor 23 in synchronization with the turning-on of the inner heater 34a and the turning-on of the outer heater 34b. Rotate.

According to the above embodiment, the inner heater 34a is turned off, the outer heater 34b is turned on, and the inner heater 34a is turned on.
Since the heaters 34a and 34b are controlled so that the inner heater 34a and the outer heater 34b are not simultaneously turned off by repeatedly turning on and off the outer heater 34b and turning off the outer heater 34b, hot air can be constantly supplied into the cooking chamber 14. . Therefore, the temperature inside the cooking chamber 14 is prevented from lowering, and as a result, a good cooking state with less unevenness in baking can be obtained.

Next, a fifth embodiment of the present invention will be described with reference to FIGS. 11 and 12. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Hereinafter, only different members will be described. First, FIG.
In the inside casing 24, the central upper exhaust port 2
A temperature sensor 38a is provided at the position 9a. The temperature sensor 38a corresponds to a hot air temperature detecting means, and is connected to the control device 35 as shown in FIG. Then, the temperature sensor 38a detects the temperature ta of the hot air formed by the small diameter fan 25 and the inner heater 34a, and outputs it to the control device 35.

Inside the outer casing 20, as shown in FIG. 11, the temperature sensor 38 is located at the upper exhaust port 32a.
b is provided. The temperature sensor 38b corresponds to hot air temperature detecting means, and as shown in FIG.
It is connected to the control device 35. And the temperature sensor 3
8b detects the temperature tb of the hot air formed by the large-diameter fan 22 and the outer heater 34b, and outputs it to the control device 35.

According to the above embodiment, when the control device 35 starts the oven cooking in the mode in which the large diameter fan 22 and the small diameter fan 25 are rotated, the output signal ta from the temperature sensor 38a and the output from the temperature sensor 38b are output. Signal t
b is detected. Then, the inner heater 34a and the outer heater 34b are on / off controlled so that the difference between the output signals ta and tb becomes a preset low value (for example, 0).
Therefore, the hot air discharged from the large-diameter fan 22 via the outer heater 34b and the small-diameter fan 25 to the inner heater 34a.
Since the temperature difference from the hot air discharged through the above is small, the temperature of each part in the cooking chamber 14 is made uniform. As a result, the food on the plate 17 is heated uniformly without being affected by the mounting area of the plate 17.

Next, a sixth embodiment of the present invention will be described with reference to FIGS. 13 and 14. The same members as those in the fifth embodiment are denoted by the same reference numerals, and description thereof will be omitted. Hereinafter, only different members will be described. A temperature sensor 39 is arranged in the cooking chamber 14 at an upper portion thereof. The temperature sensor 39 corresponds to the internal temperature detecting means and is connected to the control device 35 as shown in FIG. Then, the control device 35 controls the temperature sensor 3
9 based on the output signal from the cooking chamber 14
Is detected.

According to the above embodiment, when the controller 35 starts the oven cooking in the mode in which the large diameter fan 22 and the small diameter fan 25 are rotated, the output signal ta from the temperature sensor 38a and the output from the temperature sensor 38b are output. The signal tb and the output signal to from the temperature sensor 39 are detected. Then, the inner heater 34a and the outer heater 34b are turned on / off so that the difference between the output signals ta, tb, and to becomes a preset low value (for example, 0). For this reason,
Since the temperature of each part in the cooking chamber 14 is surely equalized,
As a result, the mounting area of the square plate 17 is not affected, and the square plate 17 is not affected.
The cooking above is heated more uniformly.

Although the temperature sensor 39 is arranged above the cooking chamber 14 in the sixth embodiment, the present invention is not limited to this. For example, the central portion of the cooking chamber 14 may be used. It suffices that the hot air discharged from the exhaust ports 29a, 29b, 32a, 32b not be directly affected by the temperature and be placed in a portion where the temperature inside the refrigerator can be detected.

In the fifth and sixth embodiments, the temperature sensor 38a is arranged at the central upper exhaust port 29a in the inner casing 24. However, the present invention is not limited to this. 24 in the central lower exhaust port 29b, in the central upper exhaust port 29a in the cooking chamber 14, or in the central lower exhaust port 29b in the cooking chamber 14. Good, inside heater 34
It may be arranged in a portion where the hot air formed by a is blown.

Further, in the fifth and sixth embodiments, the temperature sensor 38b is arranged at the upper exhaust port 32a portion in the outer casing 20, but the present invention is not limited to this. For example, the outer casing 20. Inner lower exhaust port 32b
The outer heater 34b may be provided, for example, at the upper exhaust port 32a in the cooking chamber 14 or at the lower exhaust port 32b in the cooking chamber 14. It suffices to dispose it in a portion where hot air is blown.

Further, in the above-mentioned first to sixth embodiments,
According to the operation content of the oven heating mode selection key 36c, a mode in which the large diameter fan 22 and the small diameter fan 25 are rotated, and a mode in which only the large diameter fan 22 is rotated,
The mode for rotating only the small diameter fan 25 is selected. However, the present invention is not limited to this, and may have the following configuration (1), (2), or (3), for example.

(1) A sensor (for example, a photoelectric sensor) that detects the mounting state of the four square plates 17 is provided. Then, the oven heating mode is automatically selected according to the mounting state of the square plate 17 detected based on the output signal from the sensor. (2) A sensor that detects the amount of food placed on the square plate 17 is provided. Then, the oven heating mode is automatically selected in accordance with the amount of cooked food detected based on the output signal from the sensor.

Further, in the above-mentioned first to sixth embodiments,
Although the large-diameter fan 22 and the small-diameter fan 25 are independently rotated, the present invention is not limited to this. For example, both fans 22 and 25 may be integrally rotated by the same fan motor. .

Further, in the above-mentioned first to sixth embodiments,
Although the square plate 17 is housed in the cooking chamber 14 in four stages, it is not limited to this and may be housed in, for example, three stages. In the case of this configuration, the upper shelf 18
It is good to abolish any one of a, the center upper shelf part 18b, the center lower shelf part 18c, and the lower shelf part 18d.

Further, in the above-mentioned first to sixth embodiments,
Large-diameter fan 22 and small-diameter fan 2 arranged coaxially
However, the present invention is not limited to this. For example, two centrifugal fans arranged in the vertical direction may be used to form four circulating winds, or Alternatively, a configuration may be used in which four circulating winds are formed by using one centrifugal fan that has a fan portion on each of the inner peripheral portion and the outer peripheral portion.

Further, in the above-mentioned first to sixth embodiments,
The configuration is such that four circulating winds are formed by using the blower device 19 having the two intake / exhaust parts 28 and 31, but the invention is not limited to this. For example, a blower device having two intake / exhaust parts is used. It may be configured to form three circulating winds.

Further, in the above-mentioned first to sixth embodiments,
Although the present invention is applied to a microwave oven having an oven cooking function, the present invention is not limited to this, and may be applied to, for example, a dedicated oven cooking device.

[0066]

As is apparent from the above description, the heating cooker of the present invention has the following effects. According to the means described in claim 1, it is possible to wrap three or more cooking dishes with three or more hot air streams circulating in the cooking chamber. Therefore, a large number of food items are heated and cooked at once as compared with the conventional case in which the cooking plates are mounted in two stages. According to the second aspect, it is possible to form four hot air streams circulating in the cooking chamber and wrap three or more cooking dishes with hot air. Therefore, a large number of food items are heated and cooked at once as compared with the conventional case in which the cooking plates are mounted in two stages.

According to the means described in claims 3 and 4, the ventilation passage for sucking air from the cooking chamber into the outer casing and the ventilation passage for sucking air from the cooking chamber into the inner casing can be separated. The blowing operation by the large fan and small diameter fan is made smooth. Therefore, the amount of hot air circulating in the cooking chamber is increased, and as a result, the cooking performance is improved. According to the means described in claim 5, since the large-diameter fan and the small-diameter fan rotate independently, there are a mode for rotating only the large-diameter fan, a mode for rotating only the small-diameter fan, and a mode for rotating both fans. Can be set.

According to the sixth aspect of the present invention, the temperature in the cooking chamber can be made uniform even though the predetermined circulating air is sandwiched between the remaining circulating air and is easily heated. For this reason, since the cooked food on each cooking dish is heated uniformly, the finished state of the cooked food is made uniform. According to the means of claim 7,
Hot air can be constantly supplied to the cooking chamber. Therefore, the temperature inside the cooking chamber is prevented from lowering, and as a result, a good cooking state with less unevenness in baking can be obtained.

According to the means described in claim 8, each heat source can be driven and controlled so that the temperature difference between the hot air formed by one heat source and the hot air formed by the other heat source becomes small. For this reason, the temperature inside the cooking chamber is made uniform, so that the food on the cooking plate is heated uniformly without being affected by the mounting portion of the cooking plate. According to the means described in claim 9, it is possible to drive and control each heat source so that the temperature difference between the hot air formed by one heat source and the hot air formed by the other heat source and the internal cold storage temperature becomes small. For this reason, the temperature inside the cooking chamber is surely equalized, so that the food to be cooked on the cooking dish is heated more uniformly without being affected by the mounting portion of the cooking dish.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional front view.

FIG. 3 is a vertical cross-sectional side view showing a blower device in an enlarged manner.

FIG. 4 is an exploded perspective view of a blower device.

FIG. 5 is a block diagram showing an outline of an electrical configuration.

FIG. 6 is a time chart showing how the inner heater and the outer heater are turned on and off.

FIG. 7 is a view corresponding to FIG. 1, showing a second embodiment of the present invention;

FIG. 8 is a view corresponding to FIG.

FIG. 9 is a view corresponding to FIG. 1 showing a third embodiment of the present invention.

FIG. 10 is a view corresponding to FIG. 6, showing a fourth embodiment of the present invention;

FIG. 11 is a view corresponding to FIG. 1, showing a fifth embodiment of the present invention.

FIG. 12 is a view corresponding to FIG.

FIG. 13 is a view corresponding to FIG. 1, showing a sixth embodiment of the present invention.

FIG. 14 is a diagram corresponding to FIG. 5;

FIG. 15 is a diagram corresponding to FIG. 1 showing a conventional example.

[Explanation of Codes] Reference numeral 14 is a cooking chamber, 17 is a square plate (cooking plate), 18 is a cooking plate mounting portion (cooking plate mounting means), 19 is a blower device, 20 is an outer casing, 20a is an air passage, and 22 is a diameter. Big fan, 24
Is an inner casing, 24a is an air passage, 25 is a small diameter fan, 27 is a rotating mechanism, 28 is an intake / exhaust section, 29 is an exhaust section,
29a is a central upper exhaust port, 29b is a central lower exhaust port, 30 is an intake part, 30a is an intake port (second intake port), 31 is an intake / exhaust part, 32 is an exhaust part, 32a is an upper exhaust port, 32b is an Lower exhaust port, 33 and 33A is an intake part, 33a is a first intake port, 34 is a heating device, 34a is an inner heater (inner heat source), 34b is an outer heater (outer heat source), and 35 is a control device (heat source control means). ), 37 is a cylindrical member, 38a is a temperature sensor (hot air temperature detecting means), 38b is a temperature sensor (hot air temperature detecting means), and 39 is a temperature sensor (internal temperature detecting means).
Is shown.

Claims (9)

[Claims] 1. A cooking chamber is provided with two intake and exhaust parts including an intake part and an exhaust part, and the air in the cooking chamber is sucked from the intake part of each intake and exhaust part and discharged into the cooking chamber from the exhaust part. An air blower that generates three or more circulating winds, and a ventilation device that is provided in a ventilation passage from the intake portion to the exhaust portion of each of the intake and exhaust portions, and generates each circulation air by heating the air flowing through each ventilation passage. Heating comprising a heating device that heats the air, and a cooking dish mounting portion that arranges each cooking dish in the circulating air when three or more cooking dishes are mounted in the cooking chamber. Cooking device. 2. The blower device comprises an inner casing provided on a wall of the cooking chamber, a centrifugal small-diameter fan housed in the inner casing, and a chamber of the cooking chamber so as to cover the inner casing. An outer casing provided on a wall, and a centrifugal large-diameter fan housed in the outer casing so as to be positioned coaxially with the small-diameter fan, one of the intake and exhaust parts of the blower is An exhaust part including an upper exhaust port and a lower exhaust port provided on the chamber wall of the cooking chamber corresponding to the upper and lower parts of the outer casing, and provided on the inner casing corresponding to the central part of the outer casing. And a second intake port provided in the chamber wall of the cooking chamber corresponding to the first intake port and the first intake port, and the other intake and exhaust unit of the blower device, At the top and bottom of the inner casing Accordingly, an exhaust portion including a central upper exhaust port and a central lower exhaust port provided on the chamber wall of the cooking chamber, and an intake port provided on the chamber wall of the cooking chamber corresponding to the central portion of the inner casing. The heating device is composed of an inner heat source arranged in the air passage in the inner casing and an outer heat source arranged in the air passage in the outer casing. The cooking device according to claim 1, characterized in that. 3. The cooking chamber is attached such that one end thereof corresponds to the second intake port and the other end thereof corresponds to the first intake port, and the interior of the cooking chamber is rotated as the large-diameter fan rotates. Air second
The heating cooker according to claim 2, further comprising a tubular member that guides the air from the intake port to the first intake port. 4. The cooking chamber is attached to the central portion of the small diameter fan so that one end corresponds to the second intake port and the other end corresponds to the first intake port, and the rotation of the large diameter fan rotates. The cooking device according to claim 2, further comprising: a tubular member that guides the air of the second from the second intake port to the first intake port. 5. The cooking device according to claim 2, further comprising a rotating mechanism that rotates the small diameter fan and the large diameter fan independently. 6. A heat source control means for driving and controlling a heat source provided in one ventilation passage of the blower and a heat source provided in the other ventilation passage, wherein the heat source control means is an on-time of the one heat source. 2. The heating cooker according to claim 1, wherein each heat source is controlled so that is shorter than the ON time of the other heat source. 7. A heat source control means for driving and controlling a heat source provided in one ventilation passage of the blower and a heat source provided in the other ventilation passage, wherein the heat source control means comprises the one heat source and the other 2. The heating cooker according to claim 1, wherein each heat source is controlled so that the heat sources are not turned off at the same time. 8. A hot air temperature detecting means for detecting the temperature of hot air formed by a heat source provided in one ventilation passage of the blower, and a heat source provided in the other ventilation passage of the blower. 2. A hot air temperature detecting means for detecting the temperature of hot air, and a heat source control means for driving and controlling each of the heat sources based on detection signals from the both hot air temperature detecting means. Cooking device. 9. A hot air temperature detecting means for detecting the temperature of hot air formed by a heat source provided in one ventilation passage of the blower, and a heat source provided in the other ventilation passage of the blower. A hot air temperature detecting means for detecting the temperature of the hot air, an inside temperature detecting means for detecting the inside temperature of the cooking chamber, a detection signal from the both hot air temperature detecting means and a detection signal from the inside temperature detecting means. The heating cooker according to claim 1, further comprising: a heat source control unit that drives and controls each of the heat sources.