JP2007075636A - Broiler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a flare from flaring outside from an exhaust opening in the case of an emergency of abnormal combustion inside a heating chamber. <P>SOLUTION: The flare from the heating chamber 10 comes in contact with inner walls of open pores 80a to lose its heat at passing through the pores 80a of a lower porous body 82 of a flame trap unit 80. Then, although the flare is not sufficiently cooled to be completely extinguished in the case of the lower body 82 with high temperature, further cooling the flare with an upper porous body 81 kept in a temperature lower than that of the lower body 82 is sufficient to securely extinguish the flare. Hydrocarbon gasses generated from combustion exhaust gasses and an object F to be cooked are apt to remain stuffy in the space between the upper body 81 and the lower body 82 and an extinction effect due to an oxygen shortage can also be obtained. Thereby improving the cooling effect and adding extinction effect due to the oxygen shortage as well, a sufficient extinction effect can be achieved even if areas of the pores 80a are formed into sizes large enough not to clog up. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a grill for heating an object to be cooked such as fish in a heating cabinet.

  2. Description of the Related Art Conventionally, a gas stove incorporating a grill for cooking food to be cooked such as fish in a heating chamber is known. As shown in FIG. 8, such a grill includes a grill 20 for placing the cooking object F in the heating chamber 10, and a saucer 30 for receiving baking oil and the like from the cooking object F, and above the heating chamber 10. The side surface is provided with an all-primary air burner 40 having a combustion gas flame hole formed in a vertical plane. Further, an exhaust passage 60 that guides exhaust gas generated by combustion to an exhaust port 50 that opens to the outside is provided at the back of the heating chamber 10, and the heating chamber 10 and the exhaust passage 60 communicate with each other at the upper rear surface of the heating chamber 10. A communication port 70 is formed. When cooking, a predetermined amount of water is put into the saucer 30 in advance, and then heating is started, and the fat or oil, that is, the grilled oil, from the cooking object F such as fish baked on the grill 20 is dropped onto the water surface. This prevents burning oil from igniting.

  However, if combustion is continued for a long time in a state where there is no water in the saucer 30, the baking oil accumulated in the saucer 30 may be abnormally overheated and ignite from the saucer 30 or the food F. Such a situation is unlikely in normal use, but if it should ignite, the flame in the heating chamber 10 may overflow from the exhaust port 50 to the outside as shown in FIG. Therefore, it is considered that a perforated plate portion for forming a plurality of ventilation holes for dividing the exhaust gas into a plurality of portions is provided in the exhaust passage to prevent the flame from overflowing even when ignited in the heating chamber. However, in order to obtain a flame extinguishing effect by such a perforated plate portion, it is necessary to reduce the area of each vent hole, and in order to extinguish a hydrocarbon gas flame by one perforated plate portion, a theoretically circular shape is required. It is required to reduce the diameter to about 7 mm at the vent hole. However, in practice, it is only in a very short time that a flame-extinguishing effect can be obtained with such a vent, and when the perforated plate is heated to a high temperature by the flame, the unburned gas that has passed through the vent is regenerated. It ignites and cannot be extinguished. If the heat capacity of the perforated plate is not enough, it is theoretically necessary to reduce the plate thickness to 0.6 mm with a diameter of about 0.3 mm, and even with a plate thickness of 10 mm to about 0.8 mm in diameter. Since clogging, practical use was difficult.

  The grill of the present invention has an object to solve the above-mentioned problems and to surely prevent the overflow of a flame even if the vent hole has a size that does not clog.

In order to achieve the above object, the grill according to the present invention comprises:
A heating means for cooking the food in the heating chamber;
An exhaust passage for raising the exhaust gas generated by cooking by the heating means and exhausting it through the gas exhaust port at the upper end,
A grill provided with a frame trap unit that prevents the flame from overflowing from the exhaust passage,
A plate-shaped perforated plate portion having a plurality of holes is arranged so that adjacent perforated plate portions face each other and are separated by a required interval to form the frame trap unit,
The frame trap unit is arranged in the exhaust passage (first invention).

  In the first invention, it is preferable that the flame trap unit is arranged such that all of the combustion exhaust gas passing through the exhaust passage passes through any one of the perforated plate portions (second invention).

  In the first invention or the second invention, the perforated plate portion is preferably made of a lath mesh (third invention).

  According to the grill of the first invention, a plate-shaped perforated plate portion having a plurality of holes is arranged so that adjacent multi-plate plates face each other to form a frame trap unit, and the frame The trap unit is disposed in an exhaust passage for discharging combustion exhaust gas generated in the heating chamber to the outside. Therefore, the exhaust gas generated in the heating chamber is discharged to the outside through the holes formed in the plurality of perforated plate portions. Therefore, in the unlikely event that a fire is ignited in the heating chamber, the flame spread toward the exhaust passage is cooled when passing through the vent hole of the perforated plate portion, and the flame is prevented from propagating and extinguished.

  Therefore, it is possible to prevent the flame from overflowing to the outside. In particular, by providing a space between the plurality of porous plate portions, the amount of heat transfer from the upstream porous plate portion to the downstream porous plate portion is reduced, and the downstream porous plate portion is kept at a relatively low temperature. Therefore, the cooling effect of the flame can be increased. Moreover, since the hydrocarbon gas generated from to-be-cooked products, such as combustion exhaust gas and fish, is easily trapped in the space between the perforated plate portions, a flame extinguishing effect due to lack of oxygen can also be obtained.

  Further, according to the grill according to the second aspect of the present invention, since all of the exhaust gas flowing through the exhaust passages is arranged in the exhaust passages so as to pass through the holes of the respective perforated plate portions, the overflow of the flame can be better improved. Can be prevented.

  In the grill according to the third aspect of the invention, the perforated plate portion that forms the frame trap unit is formed of a lath net that is inexpensive and has high productivity. Therefore, it is possible to prevent the overflow of the flame with an extremely inexpensive configuration.

  Next, specific embodiments of the grill according to the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram of a grill according to an embodiment of the present invention. 2 is a perspective view of the frame trap unit, and FIG. 3 is a sectional view of the frame trap.

  As shown in FIG. 1, the grill according to the present embodiment includes a grill 20 for placing the cooking object F in the heating chamber 10, and a tray 30 for receiving baking oil or the like from the cooking object F. A burner (heating means) 40 for burning fuel gas is provided on the upper side surface of the heating chamber 10. Further, an exhaust passage 60 for raising the exhaust gas generated by the combustion and guiding it to an exhaust port (gas exhaust port) 50 that opens to the outside is provided at the back of the heating chamber 10, and a heating chamber is provided at the lower rear surface of the heating chamber 10. 10 and the exhaust passage 60 are connected to each other. Further, the exhaust passage 60 is provided with a frame trap unit 80 for preventing the overflow of the flame from the exhaust port 50.

  The communication port 70 is formed at a position lower than the placement surface of the cooking object F in the grill 20. Therefore, the high-temperature exhaust gas generated from the burner 40 once accumulates in the upper portion of the heating chamber 10 and heats the food F to overflow into the communication port 70. In addition, a gap through which the outside air can enter is formed on the bottom surface on the front side of the heating chamber 10, and the outside air is sucked as the exhaust gas rises in the exhaust passage 60 due to the draft effect.

  The burner 40 is an all primary air type having a combustion surface in which a large number of small flame holes are penetrated through a porous ceramic flat plate, and the combustion surface is inclined at an angle with respect to the vertical surface upward. Installed.

  The grill of this embodiment reduces the radiant heating to the to-be-cooked object F and the baking oil which accumulated in the saucer 30 by making the burner 40 incline upward, and also the clearance gap formed in the near side bottom face of the heating chamber 10 The saucer 30 is cooled by the flow of outside air sucked from the air to the communication port 70, thereby suppressing the temperature rise of the baking oil accumulated in the saucer 30 and allowing cooking without putting water in the saucer 30. And the to-be-cooked object F set | placed on the mounting surface of the grille 20 is heated by every corner by the convection of the hot exhaust gas which fills the upper part of the heating chamber 10 without depending on the radiation of the burner 40, and is cooked well. .

  In the present embodiment, the frame trap unit 80 includes two metal plates made of stainless steel or the like in which square vent holes 80a each having a side of 3 mm are formed at intervals of 1 mm as shown in FIGS. In this case, the plate thickness is 0.6 mm, the metal plate disposed on the upper side of the exhaust passage is referred to as the upper porous plate portion 81, and the metal plate disposed on the lower side is referred to as the lower porous plate portion). A space having a predetermined interval (about 10 mm in this embodiment) is formed between the upper porous plate portion 81 and the lower porous plate portion 82, and the upper porous plate portion 81 and the lower porous plate portion 82 are separated from each other. Both ends are bent and overlapped with each other (see FIG. 2). Thereby, the frame trap unit 80 is formed in a cylindrical rectangular parallelepiped. The frame trap unit 80 is disposed so that the four sides except the upper and lower surfaces (the porous plate portion 81 and the lower porous plate portion 82) are in contact with the exhaust passage 60, and the upper and lower surfaces (the porous plate portion 81) of the frame trap unit 80. , The lower porous plate portion 82) functions as a member for allowing the exhaust gas to pass therethrough. Therefore, all the exhaust gas flowing through the exhaust passage 60 is discharged to the outside through the vent holes (holes) 80a formed in the lower porous plate portion 82 and the upper porous plate portion 81 of the frame trap unit 80, respectively. As described above, since a space having a predetermined interval is formed between the lower porous plate portion 82 and the upper porous plate portion 81, the amount of heat transfer from the lower porous plate portion 82 to the upper porous plate portion 81 is small. Thus, even if the lower porous plate portion 82 is at a high temperature, the upper porous plate portion 81 can be kept at a relatively low temperature. In addition, since it is formed in a cylindrical shape, it has a high aperture ratio (about 56%) and is robust despite its thin plate thickness, and has high durability.

  Here, the flame extinguishing effect by the frame trap unit 80 will be described. Since the propagation of the flame is caused by the transfer of heat from the combustion gas to the unburned gas, taking the heat prevents the flame from spreading and extinguishes the flame. That is, when the flame from the heating chamber 10 passes through the vent hole 80a of the lower porous plate portion 82 of the frame trap unit 80, it comes into contact with the inner wall of the vent hole 80a and heat is taken away. At this time, when the lower porous plate portion 82 is at a high temperature, the flame cannot be sufficiently cooled and cannot be completely extinguished, but the upper porous plate portion 81 kept at a lower temperature than the lower porous plate portion 82 Further cooling can surely extinguish the flame. Moreover, between the upper perforated plate portion 81 and the lower perforated plate portion 82, the combustion exhaust gas and the hydrocarbon gas generated from the cooking object F are likely to be trapped, and a flame extinguishing effect due to lack of oxygen can be obtained. In this way, the two perforated plate portions 81 and 82 are arranged so as to be spaced apart from each other and facing each other to form a frame trap unit 80, and the frame trap unit 80 is arranged in the exhaust passage. As a result, the cooling effect of the combustion exhaust gas can be improved and the flame extinguishing effect due to lack of oxygen can be improved, and a sufficient flame extinguishing effect can be obtained even if the area of the vent hole is increased so as not to be clogged. In addition, according to the structure of this embodiment, it is possible to enlarge to about 7 mm in diameter with a circular vent hole and to about 6 mm on a side with a square vent hole as a result of experiment. Therefore, the size of the vent hole is set to be 1 mm or more and less than 7 mm in diameter with a circular vent hole and about 1 mm or more to less than 6 mm on a side with a square vent hole so that it is difficult to be easily clogged and an anti-flame effect can be obtained. It is desirable.

  With the configuration as described above, when the burner 40 burns in the grill according to the present embodiment, high-temperature exhaust gas accumulates in the upper part of the heating chamber 10 and overflows to the communication port 70, and then rises through the exhaust passage 60 due to the draft effect. Through the air vent 80a and discharged to the outside. At the same time, due to this draft effect, outside air is sucked from the gap in front of the heating chamber 10 and discharged from the rear communication port 70. On the other hand, the to-be-cooked item F is cooked in every corner by convection of high-temperature exhaust gas that fills the upper portion of the heating chamber 10.

  If the baked oil accumulated in the tray 30 is abnormally overheated due to excessive combustion, the flame in the heating chamber 10 spreads to the exhaust passage 60 side as shown in FIG. However, the flame is extinguished by the frame trap unit 80 and the flame overflow from the exhaust port 50 is prevented.

  As described above, according to the grill of the present embodiment, the flame trap unit 80 incorporated in the exhaust passage 60 can prevent a flame from overflowing from the exhaust port 50 even if it is ignited in the heating chamber 10. It is safe because it can. In particular, the frame trap unit 80 is formed by providing a space between the upper porous plate portion 81 and the lower porous plate portion 82, thereby reducing the amount of heat transfer to the upper porous plate portion 81 and increasing the cooling efficiency of the flame. In addition, the space between the upper porous plate portion 81 and the lower porous plate portion 82 can be easily filled with combustion exhaust gas or hydrocarbon gas generated from the cooking object, and a flame extinguishing effect due to lack of oxygen can be obtained. The vent hole 80a does not need to be extremely small, and can be sized so as not to be clogged with oil or dust. Further, by forming the frame trap unit 80 from a metal plate, it is possible to reduce the material cost and the processing cost as compared with those made of ceramics and to make it difficult to break during transportation and use. Furthermore, the both perforations of the upper perforated plate portion 81 and the lower perforated plate portion 82 are bent to form a space with a predetermined interval between the perforated plate portions, so that there is no need to bother adjusting the spacing during the assembly operation. The work can be easily performed. In addition, since it is not necessary to add water to the saucer 30 before cooking, it is easy to use, and even if the combustion continues excessively and should ignite in the heating chamber 10, the overflow from the exhaust port 50 is ensured. It is extremely safe because of the construction that is prevented.

  Note that the surface of the frame trap unit 80 may be coated with an oxidation catalyst (for example, velovskite) that promotes decomposition of odors, smoke, and the like. By coating the catalyst in this way, the odor or smoke generated from the cooked food is decomposed by the catalytic effect when passing, so that the deodorized exhaust gas can be discharged to the outside. Further, the clogging of the air holes 80a can be prevented by such decomposition and removal action by the catalyst.

  Further, in the present embodiment, the frame trap unit 80 is formed by the two perforated plate portions 81 and 82 that are provided with a predetermined interval therebetween. However, the present invention is not limited to this and the frame trap unit 80 is provided with three or more perforated plate portions. It may be. In this embodiment, the frame trap unit 80 is formed in a cylindrical rectangular parallelepiped, but is not limited to this, and may be formed in a box, for example, or a plurality of separate porous plate portions may be spaced apart from each other. It may be attached. Further, the plurality of perforated plate portions are not necessarily provided in parallel, and may be provided at an angle. Further, the shape of the vent hole 80a is not limited to a quadrangle, and may be, for example, a circle, a triangle, a hexagon, a rhombus, or an indefinite shape. Further, the positions of the air holes 80a formed by the plurality of perforated plate portions may be formed at the same position or may be shifted. Further, the shape and size of the air holes 80a formed by the plurality of perforated plate portions may be different.

  Further, the perforated plate portion in the frame trap unit 80 is not limited to the one in which a plurality of vent holes 80a are formed in a metal plate as in the present embodiment. For example, a wire mesh may be used as shown in FIG. A lath net may be used as shown in FIG. Further, as shown in FIG. 7, a corrugated tape made of a single long metal foil is joined to one side of a base tape made of a single long metal foil in a spiral or spiral shape. It may be formed. Further, the perforated plate portion may be processed into a corrugated shape or a crank shape. Further, the perforated plate portion is not limited to metal, and may be made of ceramics.

  Although the embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and it is needless to say that the present invention can be implemented in various modes without departing from the gist of the present invention.

It is a schematic block diagram of the grill concerning one embodiment of the present invention. It is a perspective view of a frame trap. It is sectional drawing of a frame trap. It is explanatory drawing at the time of ignition. It is a perspective view of the perforated board part as another example. It is a perspective view of the perforated board part as another example. It is a perspective view of the perforated board part as another example. It is a schematic block diagram of the grill as a prior art example. It is explanatory drawing at the time of ignition.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Heater 20 ... Burning net 30 ... Sauce 40 ... Burner 50 ... Exhaust port 60 ... Exhaust passage 70 ... Communication port 80 ... Frame trap unit 81 ... Upper porous plate part 82 ... Lower porous plate part 80a ... Vent hole

Claims (3)

A heating means for cooking the food in the heating chamber;
An exhaust passage for raising the exhaust gas generated by cooking by the heating means and exhausting it through the gas exhaust port at the upper end,
A grill provided with a frame trap unit that prevents the flame from overflowing from the exhaust passage,
A plate-shaped perforated plate portion having a plurality of holes is arranged so that adjacent perforated plate portions face each other and are separated by a required interval to form the frame trap unit,
A grill characterized in that the frame trap unit is arranged in the exhaust passage.   2. The grill according to claim 1, wherein the flame trap unit is disposed so that all of the combustion exhaust gas passing through the exhaust passage passes through one of the holes of each porous plate portion. The grill according to claim 1 or 2, wherein the perforated plate portion is made of a lath net.

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