JP2808828B2 - Gas firing equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas firing device using a gaseous fuel such as city gas or liquefied petroleum gas.

2. Description of the Related Art Conventionally, this type of gas sintering apparatus has an upper burner 2 having a ceramic porous plate or a wire mesh punched metal or the like as a flame hole on a ceiling portion of a heating chamber 1, as in a gas grill shown in FIG. A grill 3 is provided substantially at the center of the heating chamber 1 so that the food 4 can be placed thereon, and a lower burner 5 for forming a Bunsen flame is provided at the lower left and right side of the heating chamber 1. There is a double-sided baking method using.

On the other hand, as in the forced convection oven shown in FIG. 3, a highly airtight opening / closing door 10 is provided in front of a heating chamber 9 in which a grill 7 on which the objects 6 are placed and a saucer 8 are stored. In some cases, a circulation fan 11 is provided behind the chamber 9, a Bunsen burner 12 for heating is provided at the bottom and outside of the heating chamber 9, and an exhaust port 13 is provided behind and above the heating chamber 9.

Problems to be Solved by the Invention However, in such a gas sintering device, good cooking results could not always be obtained. For example, the second
In the grill of the double-sided baking method shown in the figure, the upper and lower surfaces of the object 4 are simultaneously heated and cooked by the upper burner 2 and the lower burner 5, respectively. However, the lower burner 5 has a natural circulation, The ejection speed of the combustion gas was extremely low, and the combustion heat from the left and right lower burners 5 did not easily reach the center of the heating chamber 1, and the ejection balance between the right and left was difficult. In particular, as the width L of the heating chamber 1 becomes larger, the tendency becomes remarkable, and the grilling state on the lower surface of the object to be cooked 4 varies extremely between left and right or between the side and the center, and a good cooking result is obtained. I couldn't do that.

In addition, two burners, an upper burner 2 and a lower burner 5, are required to simultaneously heat the upper and lower surfaces of the object to be cooked, and the manufacturing cost is high and the structure is complicated. In particular, the cost of the upper burner was high due to the structure that radiated the radiation. Further, since the lower burner 5 or the upper burner 2 protrudes from the wall surface of the heating chamber 1, the wall surface has irregularities, and there is a drawback that cleaning or the like is difficult.

In the forced convection oven shown in FIG. 3, the combustion heat of the Bunsen burner 12 for heating is forcibly circulated inside the heating chamber 9 by the circulation fan 11 so that the food 7 is heated.
In order to maintain a uniform heat distribution in the vicinity of the object 7 to be cooked, it is necessary to increase the air flow of the circulation fan 11 and the combustion amount of the Bunsen burner 12 for heating. In comparison, the amount of combustion per heating volume is 1.5
In addition to the requirement of about two times, the airtightness of the opening and closing door 10 is required to increase the amount of circulating air, and it is necessary to make the opening and closing door 10 double glass from the viewpoint of safety.

Further, from the viewpoint of baking performance, there is a disadvantage that the amount of water in the food 7 such as fish easily evaporates due to an increase in the air volume, and the finished product has a crisp feeling.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a gas firing device having good cooking performance and a simple configuration.

Means for Solving the Problems In order to solve the above problems, the present invention provides a heating chamber having an opening / closing door in front of the gas sintering apparatus of the present invention, a grill provided in a substantially central portion of the heating chamber, and a grill below the grill. A lower burner having a plurality of flame holes facing the heating chamber from a rear wall surface of the heating chamber, and a blower arranged to forcibly send secondary air for combustion from the periphery of the lower burner substantially parallel to the grill. And a device.

Action The present invention, by the above-described configuration, wraps the combustion heat from the flame formed by the lower burner with a forced secondary air flow that is supplied from around the burner, stabilizes the flame and promotes the mixing of combustion gas and air, As a high-temperature gas flow, the upper and lower surfaces of the object can be heated and cooked from the lower burner to the door more efficiently than the lower part of the grill. Therefore, since heating can be performed simultaneously from both the upper and lower surfaces of the object to be cooked, no extra air amount or combustion amount is required, and the cooking performance is extremely good.

Example Hereinafter, an example of the gas firing device of the present invention will be described with reference to the cross-sectional view of FIG.

As shown in the figure, the heating chamber 13 has an opening / closing door 14 made of a glass door at the front, an exhaust port 15 above the rear of the heating chamber 13, and a ceramic plate 16 attached to the upper wall surface.

At the bottom, there is a saucer 19 provided with a grill 18 on which the food 17 is placed. A plurality of apertures 20 having a squeezed shape are formed on the rear wall surface of the heating chamber 13 at a height between the grill 18 and the saucer 19.
A substantially linear Bunsen-type burner 22 having a plurality of flame holes 21 faces toward the heating chamber 13 from 20. The burner 22 is surrounded by an air chamber 23, and is located in a secondary air passage forcibly supplied from a fan 24 as an air blower.

 The operation of the gas firing device of the present invention will be described.

With the above configuration, the burner 22 forms a flame in the flame hole 21, which is mixed in the air chamber 23 with secondary air forcibly supplied from a fan 24 which is a blower, and a high-temperature combustion gas As a result, the combustion gas is blown out from the opening 20 almost in parallel with the grill 18, so that the combustion gas does not locally strike the lower surface of the object 17, and the lower surface of the object 17 can be uniformly grilled.

Further, when the combustion gas flows under the grill 18 and reaches the front of the heating chamber 13, the flow velocity decreases, and the flow direction changes upward due to the draft force. It flows near the upper part and flows toward the exhaust port 15.

Since the temperature of the combustion gas hardly drops even after the lower surface of the object 17 is heated, the upper surface can be burned even if there is no radiator on the upper wall surface.

On the other hand, if a ceramic plate, which is a radiator, is attached to the upper wall surface of the heating chamber 13, the attached ceramic plate 16 is heated by the combustion gas and radiates radiant heat. Since this radiant heat is radiated almost downward, that is, toward the object to be cooked 17, the upper surface of the object to be cooked 17 also becomes hot and burns.

Therefore, even if only one burner is used, it is possible to heat both sides of the object 17 to be cooked, so that it is not necessary to provide a high-cost radiant burner as the upper burner, and the manufacturing cost can be reduced.

In addition, since the heating chamber 13 has no unnecessary irregularities other than the rear portion, cleaning and the like can be performed easily.

In addition, the combustion gas ejected from the opening 20 is effective only at a low air volume of about 1/2 as compared to a forced convection oven or the like, since the flame simply flows sideways with its draft suppressed. The amount of combustion is small and a high-temperature combustion gas can be obtained, and the baking of the object to be cooked is not dry and a suitable amount of water remains.

When the combustion gas reaches the vicinity of the door 14, the flow direction of the combustion gas is upward, and there is almost no leakage from the vicinity of the door 14 to the outside of the heating chamber 13. There is no need to do so and the structure is simple.

Effects of the Invention As described above, the following effects can be obtained according to the gas firing device of the present invention.

(1) A burner is provided at the rear of the heating chamber and below the grill, and the high-temperature combustion gas is blown out of the opening along with the secondary air forcibly supplied by the blower almost in parallel to the grill. The combustion gas does not locally strike the lower surface of the food, and the lower surface of the food can be evenly grilled.

(2) The combustion gas generated in the lower part of the grille flows under the grille and reaches the front of the heating chamber, and its flow velocity is reduced. Flows near the top of the heating chamber and goes to the exhaust port,
Since the upper surface of the heating chamber is heated and emits radiant heat, the upper surface of the object to be cooked also becomes high temperature and burns. Therefore, even if only one burner is used, both sides of the object to be cooked can be heated. There is no need to provide a burner, and manufacturing costs can be reduced.

(3) Since there is no unnecessary concavo-convex configuration except for the rear part of the heating chamber, the firing unit is easy to clean.

(4) Since a high-temperature combustion gas can be obtained with a low air flow, the object to be cooked does not dry and the moisture remains moderately.

(5) By the time the combustion gas reaches the vicinity of the door, the flow direction of the combustion gas is upward due to the draft force of the combustion gas itself, and there is almost no leakage from the vicinity of the door to the outside of the heating chamber. Therefore, there is no particular need to double the door.

(6) Since the high-temperature combustion gas flows on the upper surface of the object to be cooked, the upper surface portion can also be burned.

[Brief description of the drawings]

FIG. 1 is a sectional view of a gas firing device according to one embodiment of the present invention, and FIG.
FIG. 3 is a sectional view of a conventional gas firing device. 13: heating room, 14: opening / closing door, 15: exhaust port, 16: ceramic plate, 17: cooking object, 18: grill, 22: burner, 23: air chamber, 24: fan.

Continuation of the front page (72) Inventor Yasunori Ueda 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-3-210216 (JP, A) (58) Fields investigated ( Int.Cl. ⁶ , DB name) A47J 37/06 F24C 3/02

Claims (1)

(57) [Claims] 1. A heating chamber having an opening / closing door at the front, a grille provided substantially at the center of the heating chamber, and a plurality of flame holes facing the heating chamber from a rear wall surface of the heating chamber below the grille. And a blower disposed to forcibly send secondary air for combustion from the periphery of the burner to the grill in a substantially parallel manner.