JP2023078584A - Bonfire stand with secondary combustion mechanism - Google Patents

Abstract

To provide a bonfire stand capable of enlarging a flame even with a small amount of firewood and suppressing the generation of smoke.SOLUTION: A bonfire stand 1 with a secondary combustion mechanism comprises a combustion space B in which firewood W is burned, and an air heating chamber 11 adjacent to the combustion space B. In the air heating chamber 11, a lower opening 13 and an upper opening 15 are formed, where the upper opening 15 faces the combustion space B, and the lower opening 13 faces an external space G.SELECTED DRAWING: Figure 6

Description

TECHNICAL FIELD The present invention relates to a bonfire stand used in camping or the like.

BACKGROUND ART Conventionally, there are various types of bonfires used in camping and the like. For example, there is a type in which a box-shaped combustion chamber is filled with firewood, and a type in which firewood is arranged on a metal mesh. There are also wood-burning stoves that are similar to bonfire stands. A wood-burning stove includes a stove body forming a combustion chamber and a chimney for discharging combustion gas from the stove body.

However, in the case of box-shaped bonfires and metal mesh bonfires, the flame will not grow unless air is forced to be supplied at the beginning of ignition, and the surrounding air will only be supplied naturally after ignition. Therefore, even if the firewood is ignited once, the fire may go out. Also, if the air is insufficient, the combustible gas will be in an incomplete combustion state, and a lot of smoke will be generated. On the other hand, in the case of a wood stove, a lot of air is supplied to the combustion chamber due to the chimney effect. For this reason, the flame tends to be large, and the problem of smoke does not occur. However, the wood-burning stove requires a chimney and requires a large space (height) when used.

The present invention has been made in view of the above problems, and the first means of the present invention is a bonfire with a secondary combustion mechanism, comprising a combustion space in which firewood is burned and a combustion space adjacent to the combustion space. The air heating chamber has a lower opening and an upper opening, the upper opening facing the combustion space, and the lower opening facing the external space. ing. By adopting such a configuration, firewood is burned in the combustion space, and heat from the combustion is transferred to the air heating chamber. The air in the air heating chamber is heated. At this time, the heated air rises in the air heating chamber, so that the air in the external space enters the air heating chamber through the lower opening and the heated air in the air heating chamber is discharged from the upper opening. Since the top opening faces the combustion space, air is supplied to the flames in the combustion space for secondary combustion.

Further, in the second means, in addition to the first means, two air heating chambers are provided with the combustion space interposed therebetween.

Further, in the third means, in addition to the first means or the second means, the air heating chamber has a cross-sectional shape of an inverted triangle, and the portion corresponding to the oblique side faces the combustion space. are taking

Further, in the fourth means, in addition to any one of the first to third means, a plurality of upper openings and lower openings are formed along the horizontal direction.

Furthermore, in the fifth means, in addition to any one of the first to fourth means, both or one of the upper opening and the lower opening has a variable opening area.

According to the present invention, a large amount of air in the outer space is supplied to the combustion space, so secondary combustion is sufficiently performed in the combustion space. Therefore, even with a small amount of firewood, the flame becomes large, and the unburned gas can be reburned, so that the generation of smoke can be suppressed.

1 is a perspective view of a bonfire with a secondary combustion mechanism according to one embodiment of the present invention; FIG. FIG. 2 is a front view of the fire stand with a secondary combustion mechanism disclosed in FIG. 1; Fig. 2 is a side view of the bonfire stand with a secondary combustion mechanism disclosed in Fig. 1; FIG. 2 is a plan view of the bonfire stand with a secondary combustion mechanism disclosed in FIG. 1; FIG. 3 is a cross-sectional view taken along line AA of FIG. 2; FIG. 4 is an explanatory diagram showing the flow of air for secondary combustion;

An embodiment of a bonfire 1 with a secondary combustion mechanism of the present invention will be described below with reference to the drawings. In the description, common parts are given the same reference numerals, and overlapping descriptions are omitted as appropriate.

The bonfire 1 with a secondary combustion mechanism according to the present embodiment has a combustion space B in which firewood W (see FIG. 6) is burned, and an air heating chamber 11 adjacent to the combustion space B. The air heating chamber 11 is formed with a lower opening 13 and an upper opening 15, the lower opening 13 facing the external space G and the upper opening 15 facing the combustion space B. Details are given below.

[Combustion space]
The combustion space B is formed in the central portion of the fire table 1 in the depth direction so as to be sandwiched between the two air heating chambers 11 . The combustion space B is formed up to both ends in the width direction of the bonfire stand 1 . The members constituting the combustion space B are an inner plate 11a forming part of the air heating chamber 11, two end plates 17 arranged at both ends in the width direction of the bonfire 1, and the bottom of the combustion space B. It is a bottom plate (not shown) that is arranged in the . As shown in FIG. 5, the combustion space B has a substantially trapezoidal cross section. The combustion space B is filled with firewood W as shown in FIG.

[Air heating chamber]
The air heating chamber 11 is formed adjacent to the combustion space B. The air heating chamber 11 is composed of an inner plate 11 a facing the combustion space B, an outer plate 11 b facing the outer space G, and a top plate 11 c forming the top of the air heating chamber 11 . The inner plate 11a, the outer plate 11b, and the top plate 11c may be composed of separate members, or may be integrally composed of two or more members. That is, the inner plate 11a, the outer plate 11b, and the top plate 11c may be constructed by one member.

As shown in FIG. 5, the inner plate 11a is composed of an inclined portion that is inclined upward from the bottom and a vertical portion at the upper end, and has a bent cross-sectional shape. An upper opening 15 is formed in the vertical portion as shown in FIG. The upper opening 15 communicates with the internal space of the air heating chamber 11 . The upper opening 15 of this embodiment has a plurality of circular openings formed along the width direction of the open fire stand 1 . However, the present invention is not limited to this, and one circular opening or one or more elongated openings may be formed. In addition, an upper opening variable mechanism (not shown) that changes the opening area of the upper opening 15 may be provided.

The outer plate 11b faces the external space G and is oriented substantially vertically in use. Below the outer plate 11b, as shown in FIGS. 1 and 2, a lower opening 13 facing the external space G is formed. The lower opening 13 communicates with the internal space of the air heating chamber 11 . A plurality of circular openings are formed in the lower opening 13 of the present embodiment along the width direction of the open fire stand 1 . However, the present invention is not limited to this, and one circular opening or one or more elongated openings may be formed. Further, a lower opening variable mechanism (not shown) for varying the opening area of the lower opening 13 may be provided.

The top plate 11c is arranged between the upper end of the inner plate 11a and the upper end of the outer plate 11b, and is oriented substantially horizontally when the bonfire stand 1 is in use. In the bonfire stand 1 of the present embodiment, two top plates 11c are provided with the combustion space B interposed therebetween. Therefore, it is possible to cook foodstuffs by passing a grill (not shown) between the two top plates 11c. In addition, since heat is transferred to the top plate 11c by combustion in the combustion space B, when cooking utensils are placed thereon, they can be kept warm.

[End plate]
The end plates 17 are arranged at both ends of the fire table 1 in the width direction so as to block the combustion space B and the air heating chamber 11 from both ends. The end plate 17 has a substantially rectangular shape and has a plurality of slits formed in its upper end. At least one of the inner plate 11a, the outer plate 11b and the top plate 11c forming the air heating chamber 11 is fitted into each slit. As shown in FIG. 3, the end plate 17 of this embodiment has two slits in one air heating chamber 11 (four slits in total for the two air heating chambers 11). However, the present invention is not limited to this, and more slits may be formed. By doing so, the position of the air heating chamber 11 can be changed, and the volume of the combustion space B can be made variable.

[Action]
Next, the operation of the bonfire stand 1 according to this embodiment will be described. As shown in FIG. 6, when using the bonfire 1, the combustion space B is filled with firewood W. As shown in FIG. When the firewood W is ignited, the firewood W burns. When the firewood W is burned, the temperature of the combustion space B rises, and the temperature of the inner plate 11a of the air heating chamber 11 rises. In addition, radiant heat from the flames in the combustion space B is also transmitted to the inner plate 11a, further increasing the temperature of the inner plate 11a. Furthermore, since the inner plate 11a of this embodiment has a shape (overhang) in which the upper part protrudes with respect to the combustion space B, the flame in the combustion space B hits the inner plate directly, and the temperature of the inner plate 11a rises. encourage In addition to this, the combustion space B becomes more dynamic as the width in the depth direction narrows toward the top.

When the temperature of the inner plate 11a rises, the air in the air heating chamber 11 in contact with the inner plate 11a is also warmed. Since the heated air has a lighter specific gravity and rises, an upward air current is generated in the air heating chamber 11 . At this time, since the air heating chamber 11 is formed with the lower opening 13 and the upper opening 15 , new air is taken into the air heating chamber 11 from the external space G through the lower opening 13 . Then, the air heated in the air heating chamber 11 is discharged into the combustion space B through the upper opening 15 . That is, while the firewood W is burning, fresh air continuously flows in the order of the outer space G→lower opening 13→air heating chamber 11→upper opening 15→combustion space B.

Fresh air discharged from the upper opening 15 is supplied to the flame in the combustion space B. Therefore, a sufficient amount of oxygen is supplied to the combustible gas that has not burned out in the primary combustion, and the secondary combustion enlarges the flame. In addition, the secondary combustion brings the flame closer to complete combustion, thus suppressing the generation of smoke. Thus, by using the bonfire 1 with a secondary combustion mechanism of the present embodiment, a large flame can be generated even with a small amount of firewood W, and a flame with little smoke can be generated. A beautiful flame can be generated by secondary combustion.

1 fire stand with secondary combustion mechanism 11 air heating chamber 11a inner plate 11b outer plate 11c top plate 13 lower opening 15 upper opening 17 end plate B combustion space G outer space

Claims (5)

A bonfire with a secondary combustion mechanism,
Having a combustion space in which firewood is burned and an air heating chamber adjacent to this combustion space,
A bonfire with a secondary combustion mechanism, wherein the air heating chamber is formed with a lower opening and an upper opening, the upper opening facing the combustion space, and the lower opening facing the external space. The bonfire with a secondary combustion mechanism according to claim 1, wherein two air heating chambers are provided with the combustion space interposed therebetween. The bonfire with a secondary combustion mechanism according to claim 1 or 2, wherein the air heating chamber has an inverted triangular cross-sectional shape, and a portion corresponding to an oblique side faces the combustion space. The fire stand with a secondary combustion mechanism according to any one of claims 1 to 3, wherein a plurality of said upper openings and lower openings are formed along the horizontal direction. The open fire stand with a secondary combustion mechanism according to any one of claims 1 to 4, wherein both or one of the upper opening and the lower opening has a variable opening area.

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