JP2017015365A - Heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method capable of rotating a fan in both normal and reverse directions to thereby improve uneven heating to an object to be heated, and capable of eliminating protrusion of a motor to thereby save space.SOLUTION: A heating cooker includes: a cooking chamber 2 storing an object S to be cooked; and a hot air unit 4 that includes a hot air heater 6 configured to heat air, and a hot air fan 7 configured to feed hot air heated by the hot air heater 6 to the cooking chamber 2. The heating cooker also includes: a direct current motor 8 provided at the rear side of a main body 1 so as to separate from the hot air fan 7, and configured to drive the hot air fan 7 rotatably in both normal and reverse directions; and driving transmission means 9 of connecting the hot air fan 7 and the direct current motor 8.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a heating cooker that feeds air heated by a hot air unit into a cooking chamber and heats an object to be cooked in the cooking chamber.

  In general, this type of cooking device supplies the air heated by heating means in a hot air unit to a cooking chamber by a fan, and convects hot air into the cooking chamber to cook the food to be cooked. However, there is a problem that the AC motor that drives the fan rotates only in one direction, and structurally there is a difference in the flow of hot air in each part of the cooking chamber, causing uneven heating on the left and right sides of the cooking object. It was.

  Therefore, conventionally, in the case where the fan rotates only in one direction, a partition is provided between the cooking chamber and the hot air unit, and a ventilation hole is formed in the partition so as to communicate with the hot air unit. There has been a proposal to reduce heating unevenness by adjusting (Patent Document 1).

JP 2011-27269 A

  As described above, in the cooking device in which the fan rotates only in one direction, since the air flow is constant, there is a limit only by adjusting the air holes, and there is a point where it is difficult to heat the object to be cooked. Further, in the case where the fan is mounted coaxially with the rotating shaft of the motor as in Patent Document 1, since the fan and the motor are arranged in the front-rear direction of the cooking device, there is a problem that the motor is protruded greatly rearward. It was.

  Therefore, in view of the above problems, the present invention provides a heating cooker that can rotate a fan in both forward and reverse directions to improve uneven heating of the object to be cooked, and eliminate the protrusion of the motor to save space. The purpose is to provide.

  The heating cooker according to claim 1 includes a cooking chamber for storing an object to be cooked, a heating unit for heating air, and a hot air unit including a fan for sending hot air heated by the heating unit to the cooking chamber. The heating cooker includes a direct current motor that is provided at a position separated from the fan and that drives the fan to rotate forward and backward, and drive transmission means that connects the fan and the direct current motor. is there.

  According to a second aspect of the present invention, the drive transmission means includes a pulley and a belt.

  According to a third aspect of the present invention, the DC cooker is arranged in the lower part of the cooking chamber.

  According to a fourth aspect of the present invention, the DC cooker is disposed in a duct, and a blower for cooling the DC motor is provided in the duct.

  In the cooking device of claim 5, a power circuit or a control board is further provided in the duct.

  In the cooking device according to claim 6, the DC motor is provided with a rotation speed control function.

  The cooking device of claim 7 can replace the DC motor with an AC motor.

  In the cooking device according to the first aspect, by using the DC motor as the drive source of the fan, it is possible to rotate the fan in both forward and reverse directions to improve uneven heating of the cooking object. In addition, since the DC motor is separated from the fan, it is possible to prevent the thermal effect of the DC motor and to save space by preventing the motor from protruding.

  In the cooking device of claim 2, the hot air fan can be driven at a position relatively away from the DC motor by interlocking the DC motor and the fan with the drive transmission means by the pulley and the belt.

  In the heating cooker according to the third aspect, a DC motor having a lower heat resistant temperature than the AC motor can be used by disposing the DC motor in the lower portion of the cooking chamber having a relatively low temperature in the heating cooker.

  In the heating cooker according to the fourth aspect, the DC motor can be protected from the surrounding heat and actively cooled by flowing the cooling air from the blower into the duct.

  In the heating cooker according to claim 5, by disposing the power circuit or the control board and the DC motor in the duct provided with the blower, the cooling means of the power circuit or the control board can be shared with the cooling means of the DC motor, Space saving and cost reduction are possible.

  In the heating cooker according to claim 6, it becomes easy to rotate the DC motor in the forward direction or the reverse direction at a desired rotational speed and a desired timing, thereby enabling heating control with hot air in the cooking chamber and finely controlling it. Optimal cooking control can be realized.

  In the heating cooker according to the seventh aspect, instead of an expensive DC motor, another inexpensive model employing the same configuration and an inexpensive AC motor can be provided.

It is a front view of the heating cooker in 1st Embodiment of this invention. It is a longitudinal cross-sectional view which shows the cooking chamber and hot-air unit behind a heating cooker, and its periphery same as the above. It is an external appearance perspective view which shows a DC motor, a hot air fan, and its periphery same as the above. It is an external appearance top view which shows the duct of the heating cooker lower part, a cooling fan, and its periphery same as the above. It is a perspective view of the motor part which shows a modification same as the above. It is a schematic explanatory drawing of the heating cooker which shows 2nd Embodiment of this invention. It is sectional drawing of the principal part which shows the heating cooker of a prior art example.

  Hereinafter, preferred embodiments of the cooking device of the present invention will be described in detail with reference to the accompanying drawings.

  First, referring to FIGS. 1 to 4, the overall configuration of the heating cooker will be described. Reference numeral 1 denotes a substantially rectangular box-shaped main body that forms the outline of the heating cooker. A cooking chamber 2 having an open front surface is disposed to store the cooking object S such as. The peripheral wall forming the cooking chamber 2 includes a ceiling wall 2a, a bottom wall 2b, a left side wall 2c, a right side wall 2d, and a back wall 2e, and each of these walls 2a to 2e has a rectangular flat shape. The inside of the cooking chamber is formed. An openable / closable door 3 that covers the front surface of the cooking chamber 2 is disposed on the front surface of the main body 1.

  Reference numeral 4 denotes a hot air unit as hot air generating means provided behind the cooking chamber 2. The hot air unit 4 includes a casing 5 that forms an outer shell sharing the back wall 2e, a hot air heater 6 as a heating means for heating air, and a fan that feeds and circulates heated air into the cooking chamber 2. The hot air fan 7, a direct current motor 8 that rotates the hot air fan 7 in the forward direction or the reverse direction, and a drive transmission unit 9 that transmits the rotational force of the direct current motor 8 to the hot air fan 7 are generally configured. A hot air heater 6 and a hot air fan 7 are respectively disposed in a heating chamber 11 formed in the casing 5, while a horizontally long duct 12 shown in FIG. 4 is provided below the casing 5. A DC motor 8 is disposed in the duct 12. And the cover 13 is arrange | positioned in the rear part of the main body 1 so that the hot air unit 4 whole may be covered from the outer side.

  The hot air fan 7 of the present embodiment is provided as a so-called centrifugal fan that discharges air taken in the axial direction in a radial direction perpendicular to the axial direction by a centrifugal force during rotation, and the tubular hot air heater 6 is a hot air fan. 7 is disposed around the radial direction. For example, a sheathed heater, a mica heater, a quartz tube heater, or a halogen heater is used as the hot air heater 6 that is also a heat generating portion.

  The back wall 2e of the cooking chamber 2 that forms the wall of the cooking chamber is provided with an air suction port 14 at the center as a ventilation portion that communicates between the inside of the cooking chamber 2 and the heating chamber 11 in the casing 5. In addition, hot air outlets 15 are formed at the top and bottom.

  The hot air fan 7 is configured by radially arranging a plurality of blades 18 around the shaft 17 around a shaft 17 serving as a rotation axis thereof. The base end of the shaft 17 protrudes outward of the heating chamber 11 toward the rear of the main body 1, and a driven pulley 19B is attached and fixed thereto. In the DC motor 8, a pulley 19 </ b> A on the main drive side is attached and fixed to a rotatable motor shaft 20 that protrudes toward the rear of the main body 1. An endless belt 21 is suspended between the pulleys 19A and 19B, and a drive transmission means 9 comprising the pulleys 19A and 19B and the belt 21 connects the hot air fan 7 and the DC motor 8. .

  As shown in FIG. 3, the hot air fan 7 is located in the upper portion of the mounting plate 24 and provided in the heating chamber 11, and the DC motor 8 is located in the lower portion of the mounting plate 24 and provided in the duct 12. The hot air fan 7 and the DC motor 8 are arranged side by side on the rear side of the main body 1. More specifically, the shaft 17 of the hot air fan 7 is rotatably supported on the upper portion of the mounting plate 24, and the motor shaft 20 of the DC motor 8 is rotatably supported on the lower side. The hot air fan 7 and the DC motor 8 are provided in front of the mounting plate 24, while the pulleys 19 </ b> A and 19 </ b> B and the belt 21 are provided behind the mounting plate 24.

  As shown in FIG. 2, a dish 26 on which an object to be cooked S is placed is detachably installed in a horizontal direction via a convex dish support 27 inside the cooking chamber 2. In addition, the shape of the dish 26, the number of installation, etc. are not specifically limited.

  Next, the cooling structure of the lower part of the main body 1 will be described with reference to FIG. In the figure, the duct 12 is provided with a first room 31, a second room 32, a third room 33, and a fourth room 34 that are in communication with each other. The room 32 is provided with a blower device 35 as a cooling fan device for rotating the fan by a motor to blow air, the third chamber 33 is provided with the DC motor 7, and the fourth room 34 is provided with a fan. A power supply circuit or control board 36 is provided. The power supply circuit here is for supplying an operating voltage to each part of the heating cooker, and the control circuit mounted on the control board is not only the hot air heater 6, the DC motor 8 and the blower 35 described above, It controls operations of a blower 41, a magnetron 42, an antenna motor 43, and the like which will be described later. Although FIG. 4 shows a power supply circuit including a semiconductor element and a transformer, a control board on which a control circuit including a CPU and a memory is mounted instead may be used. Such a power circuit or control board 36 includes at least heat-generating components that require cooling.

  In the present embodiment, as indicated by the arrow F1 in the duct 12, the air is sucked into the first chamber 31 from the lower front of the main body 1 by the driving of the blower 35, and then moves to the second chamber 32 from there. The separated air is branched and sent to the third room 33 and the fourth room 34, and in the third room 33, the heat from the DC motor 7 is taken away, and in the fourth room 34, the power supply circuit or the control board 26 is taken. The first air passage 38 that takes heat from the air and is discharged to the lower rear side of the main body 1 is formed, so that not only the DC motor 7 but also the power supply circuit or the control board 26 is simultaneously cooled.

  Further, in the lower part of the main body 1, outside the duct 12, in addition to the blower device 41 by the DC fan device, in order to heat the cooking object S in the cooking chamber 2 with microwaves, as microwave generation means And the antenna motor 43 as a microwave radiation means for radiating the microwave from the magnetron 42 into the cooking chamber 2 are disposed. The antenna motor 43 is a motor that is a drive source, and an antenna is rotatably attached thereto. Microwaves from the magnetron 42 are guided to the antenna motor 43 through a waveguide (not shown).

  And in this embodiment, as shown by the arrow F2 outside the duct 12, air is sent to the magnetron 42 through the blower 41 from the lower front of the main body 1 by the drive of the blower 41, and from here the magnetron 42 A second air passage 44 is formed that takes heat away and is discharged to the lower rear of the main body 1, so that the magnetron 42 can also be cooled outside the duct 12.

  Next, the effect | action is demonstrated about the heating cooker of the said structure. After inputting the cooking start instruction after closing the door 3 with the cooking object S in the cooking chamber 2 in advance and selecting and operating a cooking menu for cooking with hot air using a key of an operation unit (not shown), In accordance with the program selected by the control circuit, a motor control signal is generated by the control circuit so that the hot air fan 7 switches the rotation direction in the forward direction or the reverse direction at a predetermined number of rotations at a predetermined time, and based on this motor control signal. Thus, the input (electric power) to the DC motor 8 is controlled. In addition, the control circuit controls the amount of heat generated by the hot air heater 6 at, for example, the timing of power interruption so that the cooking chamber 2 is heated to a desired temperature. Thus, according to the cooking menu, the rotational speed control and forward / reverse rotation control of the DC motor 8 are performed, and the heat generation amount control of the hot air heater 6 is performed.

  When the hot air fan 7 rotates forward or backward, the air sucked into the heating chamber 11 in the casing 5 from the inside of the cooking chamber 2 through the central air inlet 14 is rotated by the blade 18 by the centrifugal force of the hot air fan 7. Although the air blows in the radial direction while being pushed by the surface of the direction, since the hot air heater 6 surrounds substantially the entire circumference of the hot air fan 7, the wind from the hot air fan 7 uniformly hits the hot air heater 6 that has generated heat. Hot air is generated in the heating chamber 11 isolated from the cooking chamber 2. This hot air is sent from the heating chamber 11 into the cooking chamber 2 through a hot air outlet 15 opened in the back wall 2e as shown in FIG. Thereby, hot air circulates inside and outside the cooking chamber 2, and the cooking object S in the cooking chamber 2 is heated.

  The hot air outlet 15 is not limited to the arrangement, shape, and size as shown in FIG. 1, and can be variously arranged, shaped, and sizes as long as the hot air is supplied uniformly to the cooking chamber 2. It is. Similarly, the air inlet 14 for sucking air from the cooking chamber 2 can be variously arranged, shaped, and sized.

  In the series of operations described above, when the hot air fan 7 is rotated forward and when the hot air fan 7 is rotated reversely, the surface of the blade 18 against which air (hot air) is pressed on the outer periphery of the hot air fan 7 is opposite to the opposite direction. Become. Therefore, when the hot air fan 7 is rotated forward and backward repeatedly by the DC motor 8, the direction of the hot air from the hot air outlet 15 to the cooking chamber 2 moves up and down or left and right, and moves from the ceiling wall 2a to the left side wall 2c. Since the convection is performed so as to wrap the entire cooking chamber 2 along the right side wall 2d, the temperature distribution in the cooking chamber 2 can be made more uniform and the heating unevenness of the cooking object S can be improved. Can be improved.

  Further, since the motor shaft 20 that is the shaft of the DC motor 8 is shifted from the shaft 17 that is the shaft of the hot air fan 7 and is mutually connected by the drive transmission means 9, as shown in the conventional example of FIG. When the hot air fan 100 is directly connected to the rotating shaft 102 of the AC motor 101, the motor overhanging portion 103 is eliminated, and space saving is achieved.

  Further, since the drive transmission means 9 is configured by combining the pulleys 19A and 19B and the belt 21, the hot air fan 7 can be driven at a position relatively away from the DC motor 8, and the operation guarantee temperature is relatively low. The low DC motor 8 can be sufficiently separated from the heating chamber 11 to prevent thermal effects. In the drive transmission means 9 of the present embodiment, the shaft 17 of the hot air fan 7 and the motor shaft 20 of the DC motor 8 located at a relatively long distance can be driven in conjunction with each other. Alternatively, the drive transmission means 9 may be used.

  Regarding the cooling of the DC motor 8, in the present embodiment, the DC motor 8 is disposed in the duct 12 below the cooking chamber 2, and the blower device 35 for cooling the DC motor 8 is provided in the duct 12. Since especially the lower part of the cooking chamber 2 is a site | part with comparatively low temperature in a heating cooker, the direct current motor 8 whose heat-resistant temperature is low compared with an alternating current motor can be used reasonably. Further, by flowing the cooling air from the blower 35 into the duct 12, the DC motor 8 can be protected from the surrounding heat, and the DC motor 8 can be actively cooled in the duct 12, so that the operation is stable. Is possible. Further, since the power circuit or control board 36 is provided in the duct 12 in addition to the DC motor 8, the cooling means for the power circuit or control board 26 can be shared with the cooling means for the DC motor 8, saving space. In addition, the cost can be reduced.

  Regarding the control of the DC motor 8, in the present embodiment, not only forward / reverse control of the DC motor 8 is performed in response to a motor control signal from the control circuit, but also the rotational speed control of the DC motor 8 is performed. That is, since the DC motor 8 here has a forward / reverse control function and a rotational speed control function by the control circuit, the DC motor 8 is rotated in the forward direction or the reverse direction at a desired rotational speed and at a desired timing. Thus, heating control with hot air can be performed in the cooking chamber 2, and fine and optimal cooking control can be realized.

  FIG. 5 shows another modified example related to the present embodiment. Here, the above-described DC motor 8 can be replaced with the AC motor 47, and even in this case, the AC motor 47 does not protrude and space saving is achieved. The DC motor 8 is easy to control the rotation speed and forward / reverse rotation, but is expensive. Therefore, the use of the inexpensive AC motor 47 for another inexpensive model enables the development of another model as a heating cooker.

  As described above, in the present embodiment, the cooking chamber 2 that accommodates the cooking object S, the hot air heater 6 as a heating means for heating the air, and the fan that sends hot air heated by the hot air heater 6 into the cooking chamber 2. And a hot-air unit 4 provided with a hot-air unit 4, a direct-current motor 8 that is provided at a position separated from the hot-air fan 7 and that drives the hot-air fan 7 to rotate forward and backward, and a hot-air fan 7 and a drive transmission means 9 that connects the DC motor 8 to each other.

  In this case, by using the DC motor 8 as a drive source of the hot air fan 7, the hot air fan 7 can be rotated in both forward and reverse directions to improve heating unevenness of the cooking object S placed in the cooking chamber 2. It becomes possible. Further, since the direct current motor 8 is separated from the hot air fan 7 and the shafts are shifted from each other, the thermal effect of the direct current motor 8 is prevented, and the direct current motor 8 does not protrude rearward, thereby saving space.

  Further, the drive transmission means 9 of this embodiment is a combination of pulleys 19A and 19B and a belt 21. As a result, the direct current motor 8 and the hot air fan 7 are interlocked by the drive transmission means 9 by the pulleys 19 </ b> A and 19 </ b> B and the belt 21, and the hot air fan 9 can be driven at a position relatively away from the direct current motor 8. .

  In the present embodiment, the DC motor 8 is arranged at the lower part of the cooking chamber 2. That is, by arranging the DC motor 8 in the lower part of the cooking chamber 2 having a relatively low temperature in the heating cooker, the DC motor 8 having a lower heat resistant temperature than the AC motor 47 can be used without difficulty.

  In the present embodiment, the DC motor 8 is disposed in the duct 12, and the blower 35 that cools the DC motor 8 is provided in the duct 12. In this case, the direct current motor 8 can be protected from the surrounding heat and actively cooled by flowing the cooling air from the blower 35 into the duct 12.

  Further, a power circuit or control board 36 is further provided in the duct 12 of the present embodiment. In this case, by disposing the power circuit or control board 36 and the DC motor 8 in the duct 12 provided with the blower 35, the cooling means of the power circuit or control board 36 can be shared with the cooling means of the DC motor 8, Space saving and cost reduction are possible.

  Further, the DC motor 8 of the present embodiment has a rotation speed control function by a control circuit. In this case, it becomes easy to rotate the DC motor 8 in the forward direction or the reverse direction at a desired rotational speed and at a desired timing, thereby enabling heating control with hot air in the cooking chamber 2 to make fine and optimal cooking. Control can be realized.

  In the present embodiment, as shown in FIG. 5, the cooking device is configured so that the DC motor 8 can be replaced with the AC motor 47. Therefore, instead of the expensive DC motor 8, another inexpensive model that adopts and mounts an inexpensive AC motor 47 with the same configuration can be provided to the market.

  FIG. 7 is an oven toaster as a heating cooker showing the second embodiment of the present invention. Here, reflection plates 52 and 53 are respectively provided on the upper surface and the lower surface of the cooking chamber 51, and infrared heaters 54 and 55 serving as heating means on the inner upper and lower portions, and the thermistor and the like. Inside temperature sensors 56 and 57 as temperature detecting means are provided. On the other hand, non-contact type infrared temperature sensors 58 and 59 are respectively provided on the upper and lower portions outside the cooking chamber 51 which are outside the refrigerator. Both of the infrared temperature sensors 58 and 59 are arranged without exposing their detection parts in the cabinet.

  S ′ is a bread serving as an object to be cooked placed on a mesh plate (not shown). Here, the upper reflector 52, the upper infrared heater 54, and the temperature inside the warehouse are opposed to the upper surface of the bread S ′. 56, an upper infrared temperature sensor 58 is disposed, and a lower reflector 53, a lower infrared heater 55, a lower chamber temperature sensor 57, and a lower infrared temperature sensor 59 are disposed to face the lower surface of the bread bread S '. The In particular, the upper infrared temperature sensor 58 is arranged so that the upper surface of the bread bun S 'becomes the measurement area, and the lower infrared temperature sensor 59 is arranged so that the lower surface of the bread bun S' becomes the measurement area.

  The inside temperature sensors 56 and 57 and the infrared temperature sensors 58 and 59 correspond to temperature detecting means for detecting the temperature of the bread bread S ′ in a non-contact manner, and here, the cooking room with the bread bread S ′ as a boundary. The temperature of the upper space in 51 is detected by the temperature sensor 56 in the upper chamber, the temperature of the lower space in the cooking chamber 51 is detected by the temperature sensor 57 in the lower chamber, and the temperature of the upper surface of the bread S 'is detected by the upper infrared temperature sensor. 58, and the temperature of the lower surface of the loaf bread S ′ is detected by the lower infrared temperature sensor 59.

  Further, in the present embodiment, the average power amount of the upper infrared heater 54 serving as the upper heating means is adjusted or cut off according to the detected temperature from the upper warehouse temperature sensor 56 and / or the upper infrared temperature sensor 58, and Independently, the average power amount of the lower infrared heater 55 as the lower heating means is adjusted or cut off in accordance with the detected temperature from the lower chamber temperature sensor 57 and / or the lower infrared temperature sensor 59. .

  In the present embodiment, along with energization of the infrared heaters 54 and 55 as heating means, radiant heat is applied from the infrared heaters 54 and 55 to the upper and lower surfaces of the bread pan S ′ in the cooking chamber 51 to cook the bread pan S ′. (Baking) is performed. At the same time, the infrared heaters 54 and 55 disposed facing the upper surface side and the lower surface side of the bread bread S ′ are separately provided according to the detected temperatures from the internal temperature sensors 56 and 57 and the infrared temperature sensors 58 and 59. Adjust the amount of power or disconnect the power.

  Specifically, the temperature of the bread bread S ′ is directly detected via the infrared temperature sensors 58 and 59, and the electric power of the infrared heaters 54 and 55 and the heating amount are variably adjusted according to the degree of baking of the bread bread S ′. Then, the infrared heaters 54 and 55 are turned off when the desired baking is completed. Therefore, even when the heating condition of the bread bread S ′ is changed due to dirt or the like in the cabinet, a desired baking can be stably obtained every time.

  Conventionally, cooking bread bread S 'is cooked by adjusting the heating amount of the heating means with the temperature detected from the temperature sensor provided in the warehouse, or adjusting the energizing time of the heating means with a timer. . However, this is because the amount of heat radiation to the bread S ′ and thus the heating condition changes due to dirt in the warehouse, the temperature in the warehouse changes at the initial stage when baking the bread S ′ continuously, the heating amount of the heating means However, in the present embodiment, it is possible to eliminate such a drawback. In addition, the conventional temperature sensor has the detection unit exposed in the chamber, and the detection accuracy decreases when the surface of the detection unit becomes dirty, whereas the infrared temperature sensors 58 and 59 of the present embodiment are disposed in the chamber. In addition, since the surface temperature of the bread S ′ can be detected in a non-contact manner by infrared rays, the surface of the detection unit is not contaminated, and stable and good detection accuracy can be maintained.

  The infrared heaters 54 and 55 may be controlled based on the temperature detected by the internal temperature sensors 56 and 57, the infrared temperature sensors 58 and 59, or the internal temperature sensors 56 and 57 and the infrared temperature sensors 58 and 59. Good. Further, the infrared heaters 54 and 55 may be controlled based on the detected temperatures of the internal temperature sensors 56 and 57 on the upper side and the lower side, and the infrared heaters 54 and 55 may be controlled based on the infrared temperature sensors 58 and 59 on the other side. .

  In addition, this invention is not limited to the said Example, A various change is possible in the range which does not deviate from the meaning of this invention. For example, the shape and size of the duct 12 and the arrangement of the DC motor 8 and the blower 35 in the duct 12 can be changed as appropriate.

2 Cooking room 4 Hot air unit 6 Hot air heater (heating means)
7 Hot air fan (fan)
8 DC motor 9 Drive transmission means 12 Duct 19A, 19B Pulley 21 Belt 35 Blower 36 Power supply circuit or control board 47 AC motor

Claims (7)

A cooking chamber for storing the food,
In a heating cooker comprising: a heating unit that heats air; and a hot air unit that includes a fan that sends hot air heated by the heating unit to the cooking chamber.
A direct current motor which is provided at a position separated from the fan and which drives the fan to rotate forward and backward;
A heating cooker comprising drive transmission means for connecting the fan and the DC motor.   The cooking device according to claim 1, wherein the drive transmission device includes a pulley and a belt.   The cooking device according to claim 1 or 2, wherein the DC motor is disposed in a lower part of the cooking chamber.   The cooking device according to claim 1, wherein the direct current motor is disposed in a duct, and a blower for cooling the direct current motor is provided in the duct.   The heating cooker according to claim 4, wherein a power circuit or a control board is further provided in the duct.   The cooking device according to any one of claims 1 to 5, wherein the DC motor has a rotation speed control function. The cooking device according to any one of claims 1 to 6, wherein the DC motor can be replaced with an AC motor.

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