JP6448429B2 - Cooker - Google Patents

Description

  The present invention relates to a cooking device, and more particularly to a cooking device provided with a hot air circulation type oven.

In recent years, convection-type ovens utilizing hot air circulation have become widespread, and a cooking device in which such an oven is provided in a built-in gas stove has also been proposed (for example, Patent Document 1).
The oven chamber includes a combustion chamber that burns gas with an oven burner to generate combustion exhaust gas, and a heating chamber that communicates with the rear of the combustion chamber through a communication hole and accommodates an object to be cooked. Yes. In this type of cooking device, hot air of combustion exhaust gas generated in the combustion chamber is fed into the heating chamber through the communication hole by a circulation fan, and the cooked food is indirectly circulated by circulating the hot air into the heating chamber. Compared with the one that is cooked and has a direct heating means such as a burner in the heating chamber, uneven cooking is less likely to occur in the cooking object, and the inside of the cooking object can be baked uniformly.

An oven burner is provided in the combustion chamber of the oven cabinet in such a built-in heating cooker, and an air supply port as an air intake is provided in front of the oven burner to drive the circulation fan. Thus, external air is taken into the combustion chamber from the air supply port.
Further, as the oven burner, a flat plate burner in which a large number of flame holes are opened rearward in the left and right width direction of the combustion chamber is used, and an external portion taken in by a circulation fan from the air supply port is used. The air is supplied to the gas supply port of the oven burner as the primary air for combustion together with the fuel gas, and is also supplied as the secondary air for combustion to the flame hole group formed to open to the rear of the oven burner. The

  When external air is smoothly taken into the combustion chamber from the air supply port provided at the front end of the combustion chamber, an appropriate amount of fuel gas and primary combustion air are supplied to the gas supply port of the oven burner. While the normal combustion state is maintained and the combustion secondary air is supplied to the flame hole group through the upper and lower portions of the oven burner, the flame formed in the flame hole group is straightened toward the rear of the combustion chamber. To grow. As a result, the flame does not spread over the combustion chamber and heat the upper plate, so that the combustion chamber is not overheated.

JP2013-213649A

However, in the conventional oven burner, both the primary air for combustion and the secondary air for combustion necessary for combustion are taken into the combustion chamber from the same intake port provided at the front end of the combustion chamber. If the air supply port is blocked by dust or the like, both the combustion primary air and the combustion secondary air are reduced.
When the combustion primary air decreases due to such a blockage of the air supply port, the ratio of the fuel gas supplied from the gas supply port to the combustion primary air changes, resulting in a fuel gas rich mixed gas. Insufficient combustion is likely to occur. At the same time, when the secondary air for combustion is reduced, it is difficult to form a flame in the flame hole of the oven burner. Therefore, the combustion chamber is unlikely to become high temperature, and even if a temperature detection sensor for detecting an abnormal overheating state of the combustion chamber is provided, it is difficult for the combustion abnormality of the oven burner to be detected. As a result, the abnormality detection by the temperature detection sensor is delayed, and it takes time to stop the gas burner and stop the combustion operation of the oven burner even though the oven burner has caused incomplete combustion. There is a problem.

  The present invention has been made in view of the above problems, and when an external air is taken in from an air supply port provided in a combustion chamber by a circulation fan to burn an oven burner, the air supply port is blocked. However, it is an object of the present invention to provide a heating cooker that is unlikely to cause poor combustion of the oven burner.

The present invention taken to achieve the above object
An oven burner provided with a gas supply port through which fuel gas and primary air for combustion are taken in, and a combustion chamber provided with an air supply port for taking in external air ahead of the oven burner;
A heating chamber which is installed in communication with the combustion chamber and contains the food to be cooked;
A heating cooker having a circulation fan that takes in external air from the air supply port into the combustion chamber and sends hot air generated by the oven burner into the heating chamber for circulation.
The primary air for combustion is supplied together with the fuel gas from the gas supply port exposed outside the combustion chamber to the oven burner from the component plate of the combustion chamber,
Secondary air for combustion is supplied from the air supply port to the flame hole of the oven burner,
The gas supply port is a heating cooker that is exposed from the side plate of the combustion chamber to the outside of the combustion chamber and is opened to the inside of the case main body in which the combustion chamber is accommodated .

  In the heating cooker, the gas supply port through which the combustion primary air is taken is configured to be exposed from the component plate of the combustion chamber separately from the air supply port through which the combustion secondary air is taken in. It becomes a mode which is attracted | sucked from a different intake. As a result, even when the air supply port is closed and the amount of secondary air for combustion taken into the combustion chamber decreases, the change in the amount of primary air for combustion supplied to the gas supply port that is the intake port for the primary air for combustion There are few. Moreover, since the amount of secondary air for combustion taken in from the air supply port decreases due to the blockage of the air supply port, the ratio of the amount of primary air for combustion to the amount of secondary air for combustion increases compared to before the blockage. As a result, the amount of primary air for combustion supplied to the oven burner with respect to the entire amount of combustion air increases, so that it is possible to make it difficult for combustion failure to occur even if the air supply port is blocked. On the other hand, since the amount of secondary air for combustion sent to the flame holes of the oven burner decreases due to the blockage of the air supply port, the flame formed in the flame holes of the oven burner tends to spread upward in search of air, and the combustion chamber Is in an abnormally overheated state, so that an abnormality in the oven burner can be detected.

According to the heating cooker, the gas supply port for taking in the primary air for combustion exposed from the side plate of the combustion chamber opens into the case main body in which the combustion chamber is accommodated, and the outside of the case main body (inside the room). Therefore, the gas supply port is not easily blocked by oil smoke scattered during cooking, dust in the kitchen, or the like, and even when the air supply port is blocked, combustion failure of the oven burner is unlikely to occur. Further, for example, air taken into the case body from around the exhaust outlet or the like is supplied to the gas supply port as primary combustion air.
In the heating cooker, preferably, a separation plate for taking air in the case body into the gas supply port is provided near the gas supply port in the case body .
According to the heating cooker, the air in the case main body of the gas stove is not exchanged between the gas supply port and other places by the separation plate, and the air can be reliably guided to the gas supply port. Therefore, a certain amount of primary air for combustion can be supplied to the gas supply port of the oven burner, making it difficult for combustion failure of the oven burner to occur and preventing incomplete combustion.

In the heating cooker, preferably, the air supply port has a main air supply port provided at the front end of the combustion chamber and a sub air supply port provided on a side plate of the combustion chamber in front of the oven burner.
Providing the main air inlet at the front end of the combustion chamber makes it easy to take outside air into the combustion chamber, while the main air inlet is likely to be blocked by oily smoke or dust. In the heating cooker, since the side air supply port is provided in the side plate of the combustion chamber, even if the main air supply port is blocked, the secondary air for combustion required for combustion of the oven burner is discharged from the sub air supply port. Can be taken into the combustion chamber.

As described above, according to the present invention, the primary air for combustion and the secondary air for combustion necessary for the combustion of the oven burner are taken from different places, so that the air supply that is the intake port for the secondary air for combustion Even if the port is closed, a certain amount of primary air for combustion can be supplied to the gas supply port of the oven burner, which makes it difficult for defective combustion of the oven burner and prevents incomplete combustion.
In addition, in the case where the gas supply port is provided on the side plate of the combustion chamber, the gas supply port is not easily blocked by oily smoke or dust, so that even if the air supply port is blocked, the combustion failure of the oven burner can be avoided reliably. it can.
Furthermore, in the case where the air supply port has a main air supply port provided at the front end of the combustion chamber and a sub air supply port provided in the side plate of the combustion chamber, even if the main air supply port is blocked, Combustion secondary air can be supplied to the flame hole of the oven burner from the air supply port, so that the combustion of the oven burner can be maintained.

It is a schematic sectional perspective view which shows the heating cooker employ | adopted by embodiment of this invention. It is a disassembled perspective view which shows the combustion chamber of the heating cooker in embodiment of this invention. It is a perspective view which shows the assembly completion state of the combustion chamber of the heating cooker in embodiment of this invention. It is a schematic diagram which shows the heating cooker in other embodiment of this invention.

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 in which a case body (1) is installed in a state of being dropped into a countertop opening of a system kitchen as a heating cooker according to an embodiment of the present invention. 2 is an exploded perspective view showing a state in which the upper plate (22) of the combustion chamber is removed, and FIG. 3 is a perspective view of the combustion chamber showing a state in which the upper plate (22) is assembled.

The heating cooker is provided below the counter top with a heating chamber (10) in which food can be taken in and out by opening and closing the front door (11) of the case body (1). And a combustion chamber (20) containing an oven burner (2) to which gas is supplied from a gas supply pipe (not shown).
In the present specification, the door (11) side is referred to as the front, the back side is referred to as the rear, the width direction of the combustion chamber (20) 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 the upper wall (12), the lower wall (13), the left and right side walls (14) constituting the ceiling, and the rear wall (15) at the rear (back side). The front surface can be opened by rotating the door (11) forward, on the plate (52) in the heating chamber (10), for example, bread, cake, gratin, roast chicken, etc. Place the food to be cooked in the oven.

Behind the upper wall (12) of the heating chamber (10), a number of exhaust ports (12a) communicating with the exhaust outlet (50) through an 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, behind the rear wall (15) of the heating chamber (10), a hot air passage (30) is formed for sending hot air of the combustion exhaust gas generated in the combustion chamber (20) to the heating chamber (10) for circulation. ing.

The combustion chamber (20) is surrounded by an upper plate (22), a lower plate (23), and left and right side plates (24a) and (24b) that constitute the ceiling, and the rear is a hot air passage (30). The oven burner (2) is arranged at the approximate center in the front-rear direction in the combustion chamber (20).
At the front end of the combustion chamber (20), a main air inlet (21) consisting of a large number of openings for taking in external air as secondary air for combustion is formed, and left and right side plates (24a) of the combustion chamber (20) A sub air inlet (62) smaller than the main air inlet (21) is formed at a predetermined position in front of the oven burner (2) in (24b). A communication hole (27) communicating with the hot air passage (30) is formed behind the oven burner (2). A circulation fan (31) for storing external air into the combustion chamber (20) from the main air supply port (21) and the sub air supply port (62) is stored behind the hot air passage (30). A case (41) and a motor (4) for rotating the circulation fan (31) via the rotating shaft (42) are provided.

  As shown in FIG. 2, the oven burner (2) housed in the combustion chamber (20) has a large number of slits that open toward the rear by stacking two pressed metal plates. A flame burner group (26) consisting of a plurality of flame holes is arranged in a horizontal direction in a flat plate burner body (2a) and a side plate of the combustion chamber (20) provided on one side of the burner body (2a) ( 24a) and a venturi portion (2b). The open end of the venturi section (2b) is a gas supply port (25) into which a nozzle (not shown) for supplying fuel gas is inserted and primary combustion air is taken in.

  One side of the burner body (2a) where the venturi section (2b) is formed bulges up and down, and passes through the venturi section (2b) from the gas supply port (25) into the burner body (2a). When the mixed gas of the fuel gas and the primary air for combustion is supplied, the mixed gas can be smoothly distributed over the entire flame hole group (26) in the left-right direction.

  In this embodiment, as shown in FIG. 2 and FIG. 3, a notch is formed at a predetermined position corresponding to the gas supply port (25) of the oven burner (2) on one side plate (24a) of the combustion chamber (20). A portion (61) is formed, and the gas supply port (25) is exposed from the notch (61) to the outside of the combustion chamber (20). Since the combustion chamber (20) is housed in the case body (1), the gas supply port (25) is open to the inside of the case body (1), and the gas supply port (25) For example, air taken into the case main body (1) from around the exhaust outlet (50) provided behind the top plate (not shown) is supplied as primary combustion air.

In addition, a spark plug (34) is mounted behind the cutout portion (61) of the side plate (24a) so as to face the flame hole group (26) of the oven burner (2). Further behind 34), a temperature detection sensor (3) for detecting a combustion abnormality in the combustion chamber (20) is mounted.
Although not shown, the temperature detection sensor (3) determines that the combustion is abnormal when the temperature detected by the temperature detection sensor (3) exceeds a threshold, and stops supplying gas to the oven burner (2). At the same time, it is connected to a controller that stops the combustion operation of the oven burner (2).

In order to perform oven cooking using the heating cooker of the present embodiment, first, the door (11) is rotated forward, the plate (52) in the heating chamber (10) is pulled out, and bread dough or meat After the food to be cooked is installed, the door (11) is closed.
Then, although not shown, when the cooking start switch is turned on, the motor (4) is driven, and the rotational drive of the circulation fan (31) fixed to the tip of the rotating shaft (42) is started. External fresh air is taken into the combustion chamber (20) from (21) and the auxiliary air inlet (62). The taken-in air passes through the air flow paths formed above and below the oven burner (2), and is supplied as secondary air for combustion to the rear flame hole group (26).

  At the same time, in the venturi section (2b), the fuel gas supplied from the nozzle inserted into the gas supply port (25) exposed from the combustion chamber (20) and the gas passing through the inside of the case body (1). The combustion primary air taken in from the supply port (25) is mixed to generate a mixed gas, which is sent from the burner body (2a) to the flame hole group (26). When this mixed gas is ignited by the spark plug (34), a flame is formed in the flame hole group (26), and combustion of the oven burner (2) is started.

The hot air generated in the combustion chamber (20) by the combustion of the oven burner (2) is sent from the communication hole (27) to the hot air passage (30) by the circulation fan (31), and the circulation passage case (40) is opened. It passes through the part (40a) and 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). 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 of the circulation passage case (40) ( 40a) is returned to the heating chamber (10) through the blow holes (15a) and (15a).
Thus, by circulating hot air in the heating chamber (10), the object to be cooked stored in the heating chamber (10) is oven-cooked, and the hot air in the heating chamber (10) From the exhaust port (12a) formed in 12), it is exhausted to the outside through the exhaust passage (5) and from the exhaust outlet (50).

When the opening of the main air inlet (21) that opens to the indoor side is closed due to oil smoke generated during cooking or dust from the kitchen, it is taken in from the main air inlet (21) by the circulation fan (31) Reduced air volume. As a result, the amount of secondary air for combustion that is taken into the combustion chamber (20) and supplied to the flame hole group (26) of the oven burner (2) decreases.
On the other hand, the gas supply port (25) into which the primary air for combustion is taken in is exposed in the case body (1) and is not open to the indoor side. Even when the port (21) is closed, the change in the amount of primary air for combustion taken in from the gas supply port (25) is small. In addition, when the main air inlet (21) is blocked and the amount of secondary air for combustion taken into the combustion chamber (20) is reduced, the amount of primary air for combustion relative to the amount of secondary air for combustion is smaller than before the blockage. The rate increases. As a result, the amount of primary combustion air supplied to the oven burner (2) with respect to the total amount of combustion air increases, so the combustion performance of the oven burner (2) is improved and the main air inlet (21) is blocked. Even if it occurs, it becomes difficult to cause defective combustion, and incomplete combustion of the oven burner (2) can be prevented.

  Further, in the gas stove, as the intake of the secondary air for combustion, in addition to the main air supply port (21), the left and right side plates (24a) (24b) have a sub air supply port in front of the oven burner (2). (62) is provided, the amount of secondary air for combustion taken into the combustion chamber (20) decreases when the main air inlet (21) is closed, but the case main body (1) opens. Therefore, a certain amount of secondary air for combustion can be taken into the combustion chamber (20) from the auxiliary air supply port (62) which is not easily blocked. Thereby, even if the main air inlet (21) is closed, the combustion of the oven burner (2) can be continued.

As described above, even when the main air inlet (21) is closed, the combustion of the oven burner (2) is continued, but the amount of air taken in from the auxiliary air inlet (62) is the main air inlet ( Since the amount of air taken in from all the openings in 21) is smaller, the amount of secondary air for combustion is reduced than when the main air inlet (21) is not closed.
When the main air inlet (21) is closed, the amount of air flowing between the upper plate (22) of the combustion chamber (20) and the flame decreases, so that the flame hole group (26) of the oven burner (2) The formed flame spreads in search of air, and the upper plate (22) is directly beaten by the flame and becomes high temperature, and the temperature of the combustion chamber (20) also rises. Therefore, if the temperature detection sensor (3) detects that the temperature of the combustion chamber (20) exceeds the threshold value, the controller determines that the combustion is abnormal and before the oven burner (2) becomes incomplete combustion. In addition, the supply of gas to the oven burner (2) is stopped, and the combustion operation of the oven burner (2) is stopped.
Thus, if the combustion abnormality of the oven burner (2) occurs due to a shortage of external air taken in from the main air inlet (21) due to the main air inlet (21) being closed, incomplete combustion will occur. Since the combustion can be stopped before it becomes, safety is improved.

The auxiliary air inlet (62) is spaced apart from the main air inlet (21), but the front ends of the side plates (24a) and (24b) are notched and continuous from the main air inlet (21). The auxiliary air supply port (62) may be formed as described above.
When the auxiliary air supply port (62) is provided, the air in the case body (1) of the gas stove is taken into both the gas supply port (25) and the auxiliary air supply port (62). As shown in FIG. 4, between the gas supply port (25) and the sub air supply port (62), an L-shape is formed so that air is not exchanged between the port (25) and the sub air supply port (62). A configuration may be employed in which a plate-like separation plate (6) is provided.

(10) ... Heating chamber
(20) ... combustion chamber
(2) ・ ・ ・ ・ ・ ・ ・ ・ ・ Oven burner
(21) ... Main inlet
(25) ... Gas supply port
(26) ...
(27) ... Communication hole
(31) ・ ・ ・ ・ ・ ・ ・ ・ ・ Circulating fan
(62) ...... Sub-air inlet

Claims (3)

An oven burner provided with a gas supply port through which fuel gas and primary air for combustion are taken in, and a combustion chamber provided with an air supply port for taking in external air ahead of the oven burner;
A heating chamber which is installed in communication with the combustion chamber and contains the food to be cooked;
A heating cooker having a circulation fan that takes in external air from the air supply port into the combustion chamber and sends hot air generated by the oven burner into the heating chamber for circulation.
The primary air for combustion is supplied together with the fuel gas from the gas supply port exposed outside the combustion chamber to the oven burner from the component plate of the combustion chamber,
Secondary air for combustion is supplied from the air supply port to the flame hole of the oven burner,
The gas cooker is a cooking device that is exposed from the side plate of the combustion chamber to the outside of the combustion chamber and is opened to the inside of the case main body in which the combustion chamber is accommodated . The heating cooker according to claim 1, wherein
A cooking device having a structure in which a separation plate for taking air in the case body into the gas supply port is provided near the gas supply port in the case body . The heating cooker according to claim 1 or 2,
An air supply opening is a heating cooker which has the main air supply opening provided in the front end of the combustion chamber, and the sub-air supply opening provided in the side plate of the combustion chamber ahead of the oven burner.

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