JPH04135519A - Gas cooker - Google Patents

Abstract

PURPOSE:To improve the cooking performance by providing a secondary air blast device on the lower part burner, and also, providing an air flow adjusting plate in which a numerical aperture of the upper part than the burner center axis becomes larger than a numerical aperture of the lower part than the center, in a cooker for city gas, etc., having the upper and the lower burners. CONSTITUTION:The periphery of the lower burner 10 consisting of a Bunsen burner is surrounded by an air chamber 11, and a secondary air flow is fed from an air blast device 12. Also, an air flow adjusting plate 13 is place in the air chamber 11 between the lower burner 10 and the air blast device 12, and the secondary air flow is rectified. This plate 13 sets a total area of a hole 15 of an opening part of the upper part than the center axis 14 of the lower burner 10 larger than the same total area of the lower part than the center axis 14. In such a way, the secondary air quantity increases from the upper part of the burner 10, a high temperature gas flow from the burner 10 is deflected downward, can be allowed to reach the vicinity of an opening/ closing door 2, and the broil performance can be stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a double-sided cooking gas cooker that uses gaseous fuel such as city gas or liquefied petroleum gas and is equipped with burners on the upper and lower sides.

2. Description of the Related Art Conventionally, this type of gas cooker, like the gas grill shown in FIG. 3, has two upper burners 22 on the ceiling of a heating chamber 21, each having a flame opening 34 made of a ceramic perforated plate, wire mesh, or punched metal. The grill 2 is installed approximately in the center of the heating chamber 21.
3 was installed, and the food to be cooked 24 was placed thereon. Further, lower burners 25 for forming a Bunsen flame are installed at the lower portions of the left and right sides of the heating chamber 21. A double-sided grilling method using both the upper burner 22 and lower burner 25 is common. On the other hand, as in the forced circulation type oven shown in FIG. 4, a highly airtight opening/closing door 30 is provided in front of a heating chamber 29 in which a cooking grate 27 and a tray 28 are housed. Further, there is a type in which a circulation fan 31 is provided at the rear of the heating chamber 29, a heating Bunsen burner 32 is provided at the lower outer side of the heating chamber 29, and an exhaust port 33 is provided at the rear upper part of the heating chamber 29.

Problems to be Solved by the Invention However, with the configuration of such a conventional gas cooker, it was not always possible to obtain good cooking results. For example, in the double-sided grill shown in FIG. 3, the upper and lower surfaces of the object 24 are simultaneously heated by the upper burner 22 and lower burner 25, respectively. The lower burner 25 performs natural combustion, and the ejection velocity of its flame and combustion residue is extremely low (combustion heat from the left and right lower burners 25 is difficult to reach the center of the heating chamber 21. It was also difficult to balance the flame jets.

In particular, the convergence of the heating chamber 21 becomes thicker (the tendency becomes more severe as the heating chamber 21 becomes thicker, and the lower surface of the food to be cooked 24 is grilled on the left and right sides,
Otherwise, extreme variations occurred between the sides and the center, making it difficult to obtain good cooking results. Furthermore, the lower burner 25 protrudes outward from the side surface of the heating chamber 2,
A part of the side wall of the heating chamber 21 protrudes into the heating chamber 21. Therefore, the wall structure inside the heating chamber 21 becomes complicated,
Not only was it difficult to clean the inside of the heating chamber, but it was also dangerous as there was a risk of injuring one's hands due to the etching of the iron plate.

In addition, in the forced circulation oven shown in FIG. 4, the combustion heat of the heating Bunsen burner 32 is forcibly circulated inside the heating chamber 29 by a circulation fan 31 to heat and cook the food 26. . In a forced circulation oven, in order to maintain uniform heat distribution in the vicinity of the food to be cooked 26, it is necessary to increase the air volume of the circulation fan 31 and the combustion amount of the heating Bunsen burner 32. The amount of combustion per heating chamber volume is 1.5 to 2 times that of a normal gas grill.
Not only is the amount of air required twice, but also the air circulation volume increases, which requires the door 30 to be airtight, and from the standpoint of safety, the door 30 needs to be made of double glass. Furthermore, from the perspective of grilling performance, the increase in the amount of circulating air makes it easier for the moisture content of the food to be cooked 26, such as rice cakes, to evaporate, leaving the baked dough of the food in a dry and dry state. It also burnt and fell off easily, so it could not always be said that it was cooked well.

The present invention is intended to solve these problems, and aims to provide a gas cooker with good cooking performance and a simple configuration.

Means for Solving the Problems In order to achieve this object, the present invention includes a heating chamber having an opening/closing door in front, an upper burner provided above the heating chamber, and a burner provided approximately in the center of the heating chamber. A lower burner with multiple flame holes facing into the heating chamber from the rear wall of the heating chamber under the grate and grill, and a blower device that forcibly sends secondary air for combustion to the air chamber around the lower burner. and an outlet having a constricted shape and located downstream of the flame forming part of the lower burner, and a rectifying plate having a plurality of holes is provided between the air blower and the lower burner, and the rectifying plate has a plurality of holes. The aperture ratio above the central axis of the lower burner is larger than the aperture ratio below the central axis.

Function: With this configuration, the combustion heat from the flame formed by the lower burner can be enveloped by the forced secondary air flow supplied from around the burner due to the effect of the baffle plate, thereby making it possible to stabilize the flame. In addition, the mixture of combustion gas and air is promoted, and as a high-temperature gas flow, the lower surface of the object to be cooked can be uniformly heated over a wide range from the lower burner to the door more efficiently than the lower part of the grill. Furthermore, since the food to be cooked can be heated from both the upper and lower sides simultaneously by heating from the upper burner, extremely good cooking performance can be achieved without requiring extra air or combustion.

EXAMPLE A gas cooker according to an example of the present invention will be described below with reference to FIG.

As shown in the figure, the heating chamber 1 is equipped with an opening/closing door 2 made of a single piece of glass at the front, an exhaust port 3 at the upper rear part, and an upper burner with a ceramic perforated plate as a flame forming part at the top. 4
There is. Also, at the bottom, there is a grill 6 on which the food to be cooked 5 is placed.
is provided, and a saucer 7 is disposed below it. A Suita mouth 8 configured in a constricted shape is provided on the rear wall surface of the heating chamber 1 at a position intermediate in height between the gridiron 6 and the saucer 7. From the outside of the heating chamber 1 through this air outlet 8, the heating chamber 1 is
A lower burner 10 is provided which is a Bunsen burner having a plurality of flame holes 9 arranged substantially linearly toward the lower burner 10 . Further, this lower burner 10 is surrounded by the air chamber 1] and is located in a secondary air flow path that is forcibly supplied from the air blowing bag ff112. Furthermore, in the air chamber 11 between the lower burner 10 and the air bag #12, there is a rectifying plate 13 for adjusting the supply amount and air flow distribution of the secondary air flow or for rectifying the secondary air flow. It is provided. As shown in FIG.
The total area of the openings 16 is larger than the total area of the openings 16 below the central axis 14. The holes 15 at the upper opening of the current plate 13 have a larger diameter or a larger number than the holes 16 at the lower opening.

Next, the operation of the heating cooker configured in this way will be explained. The food to be cooked 5 placed on the grill 6 is placed in the heating chamber]
Inside, the upper burner 4 and lower burner 10 heat and cook. At this time, since the upper burner 4 covers almost the entire surface of the object 5, the upper surface of the object 5 is heated and cooked uniformly. Further, the lower burner 10 forms a flame in the flame hole 9, which is mixed with secondary air forcibly supplied by the blower 12 in the air chamber 11.
The high-temperature gas flows parallel to the food to be cooked 5 and the gridiron 6 on the lower surface thereof. At this time, the flame is mixed with secondary air in the air chamber 11, and the heat flow is stabilized, and the mixture of flame and secondary air is rapidly turned into high-temperature gas and its volume increases dramatically. The blowing velocity of the high temperature gas flow at 8 becomes extremely high, and the reachable distance of the high temperature gas flow is also significantly expanded. As a result, high-temperature waste can be flowed from the rear of the heating chamber 1 to the vicinity of the opening/closing door 2 with a relatively small amount of air. Furthermore, the flame from the lower burner 10 is ejected into the heating chamber 1 and can be seen from the outside through the glass window of the opening/closing door 2, increasing the visual effect. In addition, the amount of radiation to the rear part of the L#J5 to be cooked increases, and the heating condition of the rear part of the heating chamber 14, where conventionally the residence time of the high-temperature waste flow was short and the amount of heat transfer was relatively low, was also improved.
It also contributes to improving grilling performance.

In addition, the flow of high-temperature gas flowing out from the outlet 8 is kept to a minimum flow rate in order to maintain good grilling performance. It is difficult to maintain parallel flow up to the vicinity of the opening/closing door 2 because it is affected by the upward flow due to natural draft from the bottom of the chamber 1. Therefore, as shown in this embodiment, the secondary air flow from the air blower 12 is controlled by the rectifying plate 13 by making the opening area of the hole 15 at the upper opening larger than the opening area of the hole 16 at the lower opening. The amount of secondary air from above the burner 10 is made larger than the amount of secondary air from below the lower burner 10, and the blowing vector of the high-humidity waste flow from the lower burner 10 is configured to be slightly downward from the horizontal direction. do. With this configuration, even if affected by natural draft, the high-temperature waste flow can reach the vicinity of the opening/closing door 2 while maintaining parallel flow as a whole, and stable baking performance can always be obtained. Furthermore, since the high-temperature gas flow is conveyed in one direction from the rear to the front of the heating chamber 1, there is no interference between the high-temperature gas flow and the burner, and variations in heat distribution within the heating chamber 1 are extremely reduced. The uneven burning in step 5 will no longer occur. Moreover, this high temperature gas flow is applied to the food to be cooked 5.
It is only necessary to heat the lower surface of the oven, and compared to conventional forced circulation ovens, the air volume and combustion amount are low, and as a result, the opening/closing door 2 is not heated to a high temperature. Therefore, the user's safety can be ensured without requiring the opening/closing door 2 to be made of double glass as in the past, and the appearance is also simple.

In addition, although the hole of the opening of the rectifying plate is circular in this embodiment, the present invention is not limited to this, and the opening may have any shape.

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

(1) The flow direction of the high-temperature gas flow blown out from the lower burner is always parallel and stable to the food to be cooked.
To provide a double-sided grilling gas cooker with good grilling performance in which the food to be cooked is cooked uniformly and freshly without losing moisture.

(2) Since the temperature inside the heating chamber is kept uniform at the minimum necessary level, the configuration of the side part of the heating chamber is better than that of conventional gas cookers.
A heat-insulating structure with an easy-to-open/close door is sufficient, and a cooking device that looks good, is easy to clean, and is safe can be realized.

(3) Since the temperature distribution in the lateral direction of the heating chamber can be kept uniform, it is possible to provide a wide gas cooker with a wide width.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a stool 1 of a waste cooking device according to an embodiment of the present invention;
FIG. 2 is a perspective view of a rectifying plate of the same gas cooker, FIG. 3 is a sectional view of a main part of a conventional gas cooker, and FIG. 4 is a side sectional view of another conventional gas cooker. 1... Heating chamber, 4... Upper burner, 5
...To be cooked, 6...Grill, 8...
...Air outlet, 9...Flame hole, 10...
・Lower/%-S, 11... Air chamber, 12...
... Air blower, 13... Rectifier plate, 15...
. . . Upper opening hole, 16 . . . Lower opening hole. Agent's name: Patent attorney Haruaki Ogata and 2 others (-〃gafuna4---fiminabahybuki UbukiBFRbaryshifudenwowax) v5! , Zhang He 3 fig.

Claims (1)

[Claims] A heating chamber having an opening/closing door in front, an upper burner provided above the heating chamber, a grill provided approximately in the center of the heating chamber, and a rear wall surface of the heating chamber below the grill, A lower burner having a plurality of flame holes facing into the heating chamber, a blower device for forcibly sending secondary air for combustion to an air chamber around the lower burner, and a flame forming part downstream of the lower burner. and an air outlet having a diaphragm shape,
A gas cooker in which a rectifying plate having an opening is provided between the air blower and the lower burner, and the aperture ratio of the rectifier plate above the central axis of the lower burner is larger than the opening ratio below the central axis.