JP2015007516A - Heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating cooker which inhibits overheating of an upper plate of a combustion chamber and a bottom wall of a heating chamber in the heating cooker in which the heating chamber and the combustion chamber are located adjacent to each other in a vertical direction and hot air generated in the combustion chamber is sent to the heating chamber to be circulated.SOLUTION: A cooling air insertion passage 3 where cooling air is taken from the exterior by rotational driving of a circulation fan is formed between a bottom wall 13 of a heating chamber 10 and an upper plate 22 of a combustion chamber 20. A communication part allows the cooling air insertion passage 3 and the combustion chamber 20 to communicate with each other. The cooling air in the cooling air insertion passage 3 flows into the combustion chamber 20 through the communication part.

Description

  The present invention relates to a cooking device, and more particularly to a built-in cooking device having a heating chamber having a door that can be opened and closed on the lower front surface of a countertop.

  In general, a gas stove as a built-in type heating cooker is a grill cabinet in which a direct heating means such as a gas combustion type grill burner or an electric heater is disposed in a stove body located below the counter top in order to grill fish and the like. It has. According to the cooking device having a heating means directly in the grill cabinet, the food to be cooked can be cooked at a high temperature, so that the food to be cooked can be burnt firmly and excellent in appearance when finished. Depending on the type and size of the object to be cooked, uneven baking is likely to occur, and protrusions such as a burner are disposed in the heating chamber, which makes it difficult to care for cleaning.

  From the above viewpoint, there is a built-in heating cooker in which a combustion chamber provided with a gas burner that generates hot air is provided below the heating chamber, and the generated hot air is circulated by sending it to the heating chamber by a circulation fan. The present applicant has previously proposed (Patent Document 1). According to this heating cooker, compared to a case where a direct heating means such as a grill burner is provided in the heating chamber, uneven baking is less likely to occur in the cooking object, and it is possible to bake evenly into the cooking object. Further, by circulating hot air, heat can be quickly distributed throughout the heating chamber, so that cooking in a short time becomes possible. Furthermore, since no protrusion such as a grill burner is provided in the heating chamber, the heating chamber can be easily maintained.

JP 2013-68406 A

  However, in the cooking device using the circulation of hot air as described above, the combustion state of the gas burner may change due to changes in the amount of combustion air or variations in the dimensions of components such as the gas burner. Therefore, when the flame of the gas burner extends upward, the upper plate of the combustion chamber and the bottom wall of the heating chamber provided above the combustion chamber may be overheated and deformed. Further, if the combustion exhaust gas passage becomes narrow due to such deformation, the ventilation resistance increases, the amount of combustion air taken in decreases, or the combustion exhaust gas is taken into the combustion chamber again from the gap formed in the passage, and the combustion There is also a risk of failure.

  In order to eliminate the above inconvenience, it is conceivable to increase the height of the combustion chamber and to ensure a sufficient distance between the gas burner and the upper plate of the combustion chamber. However, in the built-in type heating cooker, space restrictions are severe, and in particular, there is little margin in the vertical dimension. Therefore, when the height of the combustion chamber is increased, the height of the heating chamber has to be decreased correspondingly, and there is a problem that the capacity of the heating chamber is decreased.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a heating chamber and a combustion chamber adjacent to each other vertically, and circulate by sending hot air generated in the combustion chamber to the heating chamber. An object of the present invention is to provide a cooking device that can suppress overheating of the upper plate of the combustion chamber and the bottom wall of the heating chamber.

The present invention taken to achieve the above object
A heating chamber in which an item to be cooked is stored;
A combustion chamber provided under the heating chamber and provided with a gas burner that generates hot air by burning combustion air and gas;
A circulation fan that takes in the combustion air from the outside and circulates the hot air generated in the combustion chamber by sending it into the heating chamber;
Between the bottom wall of the heating chamber and the upper plate of the combustion chamber, a cooling air insertion passage is formed in which cooling air is taken in from the outside by the rotational drive of the circulation fan,
The combustion chamber and the cooling air insertion passage are heating cookers in which cooling air taken into the cooling air insertion passage communicates with a communication portion that flows into the combustion chamber.

  According to the heating cooker, the cooling air insertion passage communicating with the outside is formed between the heating chamber and the combustion chamber disposed adjacent to each other in the vertical direction, and the combustion chamber, the cooling air insertion passage, Therefore, when the circulation fan is driven to rotate, external air is taken into the cooling air insertion passage as cooling air, and the taken cooling air flows into the combustion chamber through the communication portion. When the gas burner is burned to form a hot air flow path in the combustion chamber, the cooling air flowing from above the combustion chamber flows along the lower surface of the upper plate of the combustion chamber. Thereby, since a layer of cooling air is formed above the combustion chamber on the downstream side of the communication portion, overheating of the upper plate of the combustion chamber and the bottom wall of the heating chamber can be prevented. Further, in the above-mentioned cooking device, since the external low-temperature air is actively taken into the cooling air insertion passage by the rotational drive of the circulation fan, the cooling air is efficiently burned even in the narrow cooling air insertion passage. Can flow into the chamber.

The heating cooker is preferably
An auxiliary upper plate attached to the lower surface of the upper plate of the combustion chamber;
A first concavo-convex portion is formed by drawing on the downstream side of the hot air flow path from the gas burner of the upper plate,
The upper plate and the auxiliary upper plate are respectively formed with a first communication hole and a second communication hole that constitute the communication part,
The second communication hole is provided on the downstream side of the hot air flow path with respect to the gas burner.

  In the heating cooker, an auxiliary upper plate is attached to the lower surface of the upper plate of the combustion chamber, and the upper plate has a first uneven portion formed by drawing on the downstream side of the hot air flow path from the gas burner. Therefore, the strength is improved and thermal deformation due to the flame of the gas burner can be suppressed. Further, the upper plate and the auxiliary upper plate each have a first communication hole and a second communication hole, and the second communication hole located on the combustion chamber side is downstream of the hot air flow path from the gas burner. Therefore, the cooling air that has flowed into the combustion chamber via the first and second communication holes flows through the upper surface of the combustion chamber and the lower surface of the auxiliary upper plate that have a double structure. Thereby, thermal deformation can be reliably prevented. Furthermore, by forming the first uneven portion, the surface area of the cooling air insertion passage is increased, and the contact area of the cooling air passing through the cooling air insertion passage can be increased. And providing a 1st uneven | corrugated | grooved part can narrow a cooling air insertion path partially, and can speed up the passage speed of cooling air. Thereby, the cooling effect by cooling air improves and it can cool the upper board of a combustion chamber more efficiently.

In the heating cooker, preferably,
The auxiliary upper plate is attached to the lower surface of the first uneven portion forming area of the upper plate,
The first communication hole is provided in a convex portion of the first uneven portion,
The second communication hole is provided in the auxiliary upper plate facing the convex portion in which the first communication hole is formed.

  According to the heating cooker, since the auxiliary upper plate is attached to the lower surface of the first uneven portion forming area provided on the downstream side of the hot air flow path from the gas burner, among the upper plates of the combustion chamber, The most heated part can be reinforced. In addition, the first communication hole is formed in the convex portion of the first uneven portion formed in the upper plate, and the second communication hole is formed in the auxiliary upper plate facing the convex portion, whereby the upper plate and the auxiliary upper plate are formed. Since a certain space can be formed between them, the contact area between the cooling air and the upper plate and the auxiliary upper plate while the cooling air passes through the first communication hole and the second communication hole is increased. The upper plate and the auxiliary upper plate can be efficiently cooled without increasing the height of the passage.

In the heating cooker, preferably,
An auxiliary bottom wall attached to the lower surface of the bottom wall of the heating chamber;
A second uneven portion is formed on the auxiliary bottom wall by drawing.

  In the heating cooker, the auxiliary bottom wall is attached to the lower surface of the bottom wall of the heating chamber, and the second bottom uneven portion is formed on the auxiliary bottom wall by drawing, so that the strength is improved and the combustion chamber Even if the upper plate is overheated, thermal deformation of the bottom wall can be prevented. Further, by providing the second concavo-convex portion on the auxiliary bottom wall attached to the lower surface of the bottom wall, the cooling air insertion passage is partially narrowed, and the passage speed of the cooling air can be increased. Thereby, the cooling effect by cooling air improves and the bottom wall of a heating chamber can be cooled more efficiently.

In the heating cooker, preferably,
The cooling air insertion passage is closed on the downstream side of the flow path of the cooling air from the communication portion.

  By closing the cooling air insertion passage on the downstream side of the communication portion, most of the air taken into the cooling air insertion passage can flow into the combustion chamber from the communication portion. Thereby, a layer through which cooling air flows more reliably above the combustion chamber can be formed. Moreover, since there is no inflow of cooling air from other than the communicating portion, the combustion state of the gas burner can be stabilized.

  As described above, according to the present invention, the cooling air insertion passage is formed between the bottom wall of the heating chamber and the upper plate of the combustion chamber so that the cooling air is taken in from the outside by the rotational drive of the circulation fan, Since the combustion chamber and the cooling air insertion passage communicate with each other through a communication portion that allows cooling air to flow into the combustion chamber from the cooling air insertion passage, a cooling air layer can be formed along the lower surface of the upper plate of the combustion chamber. An excessive temperature rise of the upper plate of the combustion chamber and the bottom wall of the heating chamber can be prevented. Thereby, it is possible to prevent thermal deformation of the upper plate of the combustion chamber and the bottom wall of the heating chamber without setting a long distance from the gas burner to the upper plate of the combustion chamber in the vertical direction, thereby preventing the occurrence of defective combustion.

In addition, in the case where an auxiliary upper plate is attached to the lower surface of the upper plate of the combustion chamber, and the first uneven portion by drawing is provided on the upper plate on the downstream side of the hot air flow path, the portion most easily heated In addition to improving the strength of the cooling air passage, the surface area of the cooling air insertion passage increases and the passage speed of the cooling air increases at a portion where the cooling air insertion passage narrows, so that efficient cooling can be performed and thermal deformation can be achieved. Can be further suppressed.
Further, an auxiliary upper plate is attached to the lower surface of the first uneven portion forming area of the upper plate, the first communication hole is provided in the convex portion of the first uneven portion, and the second communication hole is provided in the auxiliary upper plate facing the convex portion. In the provided one, a constant space is formed between the upper plate and the auxiliary upper plate, and the cooling air passes through the space, so that more efficient cooling is possible.
And, by adding an auxiliary bottom wall to the bottom wall of the heating chamber and providing the second uneven portion by drawing on the auxiliary bottom wall, not only can the strength be improved, but the surface area of the cooling air insertion passage is increased, Furthermore, since the passage speed of the cooling air is increased in a portion where the cooling air insertion passage is narrowed, efficient cooling can be performed and thermal deformation can be further suppressed.

  Also, in the case where the cooling air insertion passage is closed downstream of the communication air flow path from the communication portion, most of the cooling air taken into the cooling air insertion passage from the outside is connected to the combustion chamber via the communication portion. Therefore, it is possible to reliably flow cooling air while ensuring good combustion of the gas burner.

It is a schematic cross-sectional perspective view which shows the heating cooker in embodiment of this invention. It is a principal part expansion cross-sectional perspective view which shows the back part of the heating cooker in embodiment of this invention. It is a principal part expanded sectional perspective view of the heating cooker in embodiment of this invention. It is a top view which shows the back part of the upper board of the combustion chamber of the heating cooker in embodiment of this invention. It is a principal part expanded sectional perspective view of the state which moved the heating chamber of the heating cooker in embodiment of this invention upwards from the combustion chamber.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a schematic cross-sectional perspective view of a built-in gas stove as a cooking device according to an embodiment for carrying out the present invention, and FIG. 2 is an enlarged cross-sectional perspective view of a main part showing a rear portion thereof.

In this case, the case body (1) is installed in the state of being dropped into the opening of the countertop of the system kitchen.In the case body (1), the door on the front of the gas stove (11 ) And a combustion chamber (10) having a gas burner (2) which is provided below and is supplied with gas from a gas supply pipe (not shown). 20).
In this specification, the door (11) side of the heating chamber (10) is referred to as the front, the back side is referred to as the rear, the width direction of the heating chamber (10) is referred to as the left-right direction, and the height direction is referred to as the up-down direction.

The heating chamber (10) is formed in a box shape from an upper wall (12), a bottom wall (13), left and right side walls (14) constituting the ceiling, and a rear wall (15) at the rear (back side). The front face is closed by a door (11) so that it can be opened forward.
When the door (11) is rotated forward (front side), the plate (52) can be pulled out, and a food such as fish is placed on the pulled plate (52). Then, if the heating chamber (10) is closed by rotating the door (11) rearward, the cooking object is accommodated in the heating chamber (10).

  Behind the upper wall (12) of the heating chamber (10), a number of exhaust holes (12a) communicating with the exhaust port (50) through a combustion exhaust passage (5) formed above the upper wall (12). ) Is formed. In addition, on the left and right sides of the rear wall (15) of the heating chamber (10), there are formed a number of blow holes (15a) (15a) for sending hot air into the heating chamber (10), and the center A plurality of suction holes (15b) for taking in hot air in the heating chamber (10) are formed. Further, a hot air passage (30) is formed behind the rear wall (15) of the heating chamber (10) for sending hot air of the combustion exhaust gas generated in the combustion chamber (20) to the heating chamber (10) for circulation. ing.

As shown in FIG. 3, an auxiliary bottom wall (16) is attached to the lower surface of the bottom wall (13) of the heating chamber (10). The auxiliary bottom wall (16) is attached to the entire lower surface of the bottom wall (13) in the left-right direction, and the gas burner (2) in the combustion chamber (20) is disposed in the front-rear direction. The rear end portion (16d) is placed on the upper surface of the upper plate (22) of the combustion chamber (20) described later.
Further, as shown in FIGS. 3 and 5, the auxiliary bottom wall (16) is formed with a plurality of protrusions extending in the left-right direction by drawing and projecting upward at predetermined intervals in the front-rear direction. . Thereby, the 2nd uneven part (16a) is formed in the auxiliary bottom wall (16). The auxiliary bottom wall (16) is joined to the bottom wall (13) at the front and rear end portions and the convex portion (16b).

The combustion chamber (20) is surrounded by an upper plate (22), a bottom plate (23), and left and right side plates (24) constituting the ceiling, and the rear is in communication with the hot air passage (30). In the combustion chamber (20), a gas burner (2) is disposed approximately at the center in the front-rear direction.
This gas burner (2) is formed by joining two pressed plates, and at the rear of the gas burner (2), there are a number of slit-shaped flame holes that open toward the rear side. Are arranged at predetermined intervals. Further, a combustion air intake port (21) communicating with the outside is provided on the front surface of the combustion chamber (20), and the combustion air is taken into the combustion chamber (20). The external combustion air and gas sucked from the combustion air intake port (21) are mixed by the gas burner (2) and burned, so that the hot exhaust gas flowing toward the rear of the combustion chamber (20) is heated. Occur.

  As shown in FIG. 3, an auxiliary upper plate (26) having an L-shaped cross section is attached to the lower surface of the upper plate (22) of the combustion chamber (20). The auxiliary upper plate (26) is attached to the entire lower surface of the upper plate (22) in the left-right direction, and extends rearward from the position where the gas burner (2) is disposed in the front-rear direction. doing.

  Further, as shown in FIGS. 3 and 5, a plurality of protrusions extending in the left-right direction and projecting downward are formed in the front-rear direction at the rear portion of the upper plate (22). Thus, the first uneven portion (22a) is formed on the upper plate (22), and the auxiliary upper plate (26) is joined to the upper plate (22) by the front and rear end portions and the concave portion (22c). Furthermore, the rear ends of the upper plate (22) and the auxiliary upper plate (26) are bent upward along the rear of the heating chamber (10).

  The top surface (25) of the convex portion (22b) of the upper plate (22) and the flat plate portion of the auxiliary upper plate (26) opposite thereto are respectively provided with a first communication hole (25a) and a second communication hole constituting the communication portion. A communication hole (26a) is formed. The second communication hole (26a) on the combustion chamber side is provided so as to be located behind the first communication hole (25a) on the cooling air insertion passage side, and is a hot air generation position of the gas burner (2). It is provided behind the flame hole, that is, downstream of the hot air flow path. The first communication hole (25a) may be provided on the upstream side of the hot air flow path from the gas burner (2).

  The auxiliary bottom wall (16) and the upper plate (22) are disposed so as to be separated from each other by a certain distance in the vertical direction. Also, by bending the rear end of the upper plate (22) upward along the rear of the heating chamber (10), the space between the auxiliary bottom wall (16) and the upper plate (22) Is open so that it can communicate with the outside on both the front and left and right sides. Therefore, when the circulation fan (31) is driven to rotate, the space between the auxiliary bottom wall (16) and the upper plate (22) serves as a cooling air insertion path (3) through which air is taken in from both the front and left and right sides. Function.

  As shown in FIG. 2, the hot air passage (30) is surrounded by a hot air passage case (40) at the upper, left and right sides, and is formed in the center of the rear wall (15) of the heating chamber (10). The heating chamber (10) communicates with the suction hole (15b).

A circulation fan case (41) is disposed behind the rear wall (15) of the heating chamber (10) so as to surround the hot air passage case (40) from both the left and right sides and the rear.
A circulation fan (31) is accommodated in the circulation fan case (41), and its rear surface is closed except for an insertion hole through which the rotation shaft of the motor (4) is inserted, and is circulated at the tip of the rotation shaft. The fan (31) is fixed. The upper surface, bottom surface, and front end portions of the left and right side surfaces of the circulation fan case (41) are joined and closed with the peripheral edge of the rear wall (15), and are formed on the rear surface of the hot air passage case (40). It communicates with the hot air passage (30) through the opening (40a).

  In addition, the rear of the hot air passage case (40) in the circulation fan case (41) is a circulation passage (32) .When the circulation fan (31) is driven to rotate, it is located at the center of the rear wall (15). The hot air in the heating chamber (10) sucked from the formed suction hole (15b) and the hot air generated in the lower combustion chamber (20) are circulated from the opening (40a) through the hot air passage (30). It is sucked into the passage (32) and sent out into the heating chamber (10) from the blow holes (15a) (15a) formed on the left and right sides of the rear wall (15). Thereby, hot air can be circulated in the heating chamber (10), and the cooking object such as fish and meat accommodated in the heating chamber (10) can be cooked in the oven.

A motor (4) is housed behind the circulation fan case (41), and a cooling fan (33) rotates between the circulation fan case (41) and the motor (4). It is fixed to the shaft.
The left and right sides and the rear of the cooling fan (33) are surrounded by a cool air passage case (43) and communicated with the motor housing chamber (44) of the motor (4). An intake port (42) communicating with the outside is formed at the rear.

Next, the case where heat cooking is performed using the gas stove of this Embodiment is demonstrated.
First, rotate the door (11) forward, place the food to be cooked such as fish or meat on the grill plate or oven plate in the heating chamber (10), then rotate the door (11) backward Thus, the front opening of the heating chamber (10) is closed. Then, although not shown, when the cooking start switch is turned on, the motor (4) is driven to start the rotational drive of the circulation fan (31), and the combustion air intake port (21 on the front surface of the combustion chamber (20)) ) Combustion air is taken from. Thus, by rotating the circulation fan (31) prior to ignition of the gas burner (2), the cooling air layer is formed before the hot air flow path is formed in the combustion chamber (20). ), The cooling effect can be obtained more reliably.

  Next, when the gas burner (2) is ignited and combustion starts, the hot air of the combustion exhaust gas generated in the combustion chamber (20) is sent to the hot air passage (30), and the opening (40a) of the hot air passage case (40) Then, it is fed into the heating chamber (10) from the blow holes (15a) (15a) formed on the left and right sides of the rear wall (15) through the circulation passage (32). Then, the hot air sent into the heating chamber (10) returns from the central suction hole (15b) of the rear wall (15) to the hot air passage (30), and again, the opening (40a of the hot air passage case (40) ), The circulation passage (32), and the blowout holes (15a) and (15a) to be returned to the heating chamber (10).

  In this way, the hot air circulates in the heating chamber (10), thereby rapidly increasing the temperature in the heating chamber (10), and the food to be cooked such as fish and meat stored in the heating chamber (10). Can be cooked. Then, part of the hot air in the heating chamber (10) passes from the exhaust hole (12a) formed in the upper wall (12), through the combustion exhaust passage (5), to the outside from the exhaust port (50). Exhausted.

  Simultaneously with the rotational drive of the circulation fan (31), the cooling fan (33) is rotationally driven, and the external air taken in from the air inlet (42) formed in the rear part of the case body (1) 44) After being sent into the interior and cooling the motor (4), it is discharged to the outside through the exhaust port (50).

  In this embodiment, simultaneously with the rotational drive of the circulation fan (31), cooling air outside the case body (1) is also taken into the cooling air insertion passage (3), and the taken cooling air is inserted into the cooling air insertion passage. It flows backward in the passage (3). At this time, as shown in FIG. 5, cooling air formed between the auxiliary bottom wall (16) of the bottom wall (13) of the heating chamber (10) and the upper plate (22) of the combustion chamber (20). The insertion passage (3) is opened not only in the front but also in the left and right sides, so that external air can be reliably taken in. Further, since the rear portion of the cooling air insertion passage (3) is blocked, most of the taken-in air is combusted through the first communication hole (25a) and the second communication hole (26a) constituting the communication portion. Can flow into the chamber (20). Moreover, since the cooling air insertion passage (3) is not in communication with the hot air flow path in the combustion chamber (20) except for the communication portion, it does not flow into the hot air passage (30), for example. Therefore, the flow of hot air is not hindered, and the gas burner (2) can be burned stably.

  Further, as shown in FIG. 5, the cooling air flows into the combustion chamber (20) through the first communication hole (25a) and the second communication hole (26a). One communication hole (25a) is formed in the convex portion (22b) of the upper plate (22), and the second communication hole (26a) on the combustion chamber side is an auxiliary upper plate (on the surface facing the convex portion (22b)). Since the cooling air passes through the first communication hole (25a) and the second communication hole (26a), the cooling air contacts the upper plate (22) and the auxiliary upper plate (26). The area can be increased. Furthermore, since the cooling air insertion passage (3) is narrowed by the first uneven portion (22a), the speed of the cooling air flowing into the first communication hole (25a) can be increased. Therefore, the upper plate (22) and the auxiliary upper plate (26) can be efficiently cooled without increasing the height of the cooling air insertion passage (3). Moreover, the auxiliary upper plate (26) is provided on the lower surface of the first uneven portion (22a) formation region of the upper plate (22), and the second communication hole (26a) exposed to the combustion chamber (20) is a gas burner ( Since it is located near the upper part of 2) and downstream of the hot air flow path than the gas burner (2), it is possible to improve the strength of the most easily heated part and to perform efficient cooling. .

  Further, since hot air from the gas burner (2) flows toward the rear hot air passage (30) in the combustion chamber (20), as shown in FIG. 5, the combustion chamber (20a) is connected to the combustion chamber (20a). The cooling air that has flowed into (20) is sent to the rear along the lower surface of the auxiliary upper plate (26) by the draft action, and rises in the hot air passage (30) while joining the hot air.

Due to the combustion of the gas burner (2), the inside of the combustion chamber (20) becomes hot, and accordingly, the upper plate (22) burned by the flame of the gas burner (2) also becomes hot, but above the upper plate (22), A cooling air insertion passage (3) through which cooling air flows is formed, and a layer of cooling air is formed in the lower rear area of the auxiliary upper plate (26) by the cooling air flowing in from the second communication hole (26a). Therefore, the heat from the gas burner (2) is hardly transmitted to the upper plate (22) of the combustion chamber (20).
As a result, it is possible to prevent the upper plate (22) from being overheated to a high temperature and to be thermally deformed, increasing exhaust resistance due to thermal deformation of the upper plate (22), and reducing intake of combustion air. It is possible to prevent inconveniences such as causing a combustion failure of the gas burner (2).

  In addition, since the auxiliary bottom wall (16) constituting the upper surface of the cooling air insertion passage (3) is also provided with a plurality of second irregularities (16a) by drawing, the strength against thermal deformation is increased. As the surface area of the cooling air insertion passage (3) increases, the bottom wall (13) of the heating chamber (10) can be efficiently cooled by the cooling air passing through the cooling air insertion passage (3). Further, the cooling air insertion passage (3) is narrowed at the position where the recess (16c) is formed, and the cooling speed can be further improved when the cooling air passes through this narrow portion, so that the passing speed is increased.

  In the embodiment described above, the first uneven portion (22a) is provided on the upper plate (22) of the combustion chamber (20), and the auxiliary upper plate (26) is provided on the lower surface of the formation region of the first uneven portion (22a). Although the auxiliary upper plate (26) is not provided, only the flat upper plate (22) having the first communication hole (25a) may be used without providing the auxiliary upper plate (26). In this case, it is preferable that the first communication hole (25a) constituting the communication portion is formed on the downstream side of the hot air flow path with respect to the gas burner (2). Moreover, in the said embodiment, although the auxiliary bottom wall (16) which formed the 2nd uneven | corrugated | grooved part (16a) is attached to the bottom wall (13) of a heating chamber (10), an auxiliary bottom wall (16) The cooling air insertion path (3) may be constituted by the bottom wall (13) without providing the above.

(10) ... Heating chamber
(11) ... Door
(13) ......... Bottom wall
(16) ... Auxiliary bottom wall
(2) ・ ・ ・ ・ ・ ・ ・ ・ ・ Gas burner
(20) ... combustion chamber
(22) ... upper plate
(25a) ... 1st communication hole
(26) ... Auxiliary upper plate
(26a) ... 2nd communication hole
(3) ・ ・ ・ ・ ・ ・ ・ ・ ・ Cooling air passage
(31) ・ ・ ・ ・ ・ ・ ・ ・ ・ Circulating fan

Claims (5)

A heating chamber in which an item to be cooked is stored;
A combustion chamber provided under the heating chamber and provided with a gas burner that generates hot air by burning combustion air and gas;
In the cooking device comprising a circulation fan that takes in the combustion air from the outside and sends the hot air generated in the combustion chamber to the heating chamber for circulation.
Between the bottom wall of the heating chamber and the upper plate of the combustion chamber, a cooling air insertion passage is formed in which cooling air is taken in from the outside by the rotational drive of the circulation fan,
The said cooking chamber and the said cooling air insertion channel | path are heating cookers with which the cooling air taken in into the said cooling air insertion channel | path is connected by the communication part into which the said combustion chamber flows. The heating cooker according to claim 1, further comprising:
An auxiliary upper plate attached to the lower surface of the upper plate of the combustion chamber;
A first concavo-convex portion is formed by drawing on the downstream side of the hot air flow path from the gas burner of the upper plate,
The upper plate and the auxiliary upper plate are respectively formed with a first communication hole and a second communication hole that constitute the communication part,
The second communication hole is a heating cooker provided on the downstream side of the hot air flow path with respect to the gas burner. The cooking device according to claim 2,
The auxiliary upper plate is attached to the lower surface of the first uneven portion forming area of the upper plate,
The first communication hole is provided in a convex portion of the first uneven portion,
The second communication hole is a heating cooker provided in the auxiliary upper plate facing the convex portion in which the first communication hole is formed. The cooking device according to any one of claims 1 to 3, further comprising:
An auxiliary bottom wall attached to the lower surface of the bottom wall of the heating chamber;
A cooking device in which a second uneven portion is formed on the auxiliary bottom wall by drawing. In the heating cooker according to any one of claims 1 to 4,
The cooking device in which the cooling air insertion passage is closed on the downstream side of the flow path of the cooling air with respect to the communication portion.

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