Solid fuel combustor

Abstract

To provide a solid fuel combustor enabling combustion in a stable combustion state from start of the combustion.SOLUTION: The solid fuel combustor has a fuel placement part 2, a primary air chamber 4 and a combustion chamber 3 in a combustor body 1, and includes a secondary air chamber 5 located adjacent to the combustion chamber 3 provided on an outer side of a side plate 1B of the combustor body 1. The fuel placement part 2 has a primary air supply port 20, and air in the primary air chamber 4 is supplied to the combustion chamber 3 to burn solid fuel. A side plate 1C has air intake ports 40, and when air in the primary air chamber 4 is supplied to the combustion chamber 3, air in an external space passes through the air intake ports 40 and flows into the primary air chamber 4. The side plate 1B has secondary air supply ports 30 and second secondary air supply ports 31 for communicating the combustion chamber 3 and the secondary air chamber 5, and air in the secondary air chamber 5 passes through the secondary air supply ports 30 and the second secondary air supply ports 31 and is supplied to the combustion chamber 3 so as to enable combustion of unburned gas that cannot be burned by using the air supplied from the primary air supply port 20.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a solid fuel combustion device that burns solid fuel such as firewood or charcoal. [Background technology]

[0002] There is a type of burner called a fire pit that is used when camping. This burner is composed of a box-shaped burner body, a fuel placement part placed on the bottom plate of the burner body, and a combustion chamber formed above the fuel placement part. Firewood is fed into the upper opening of the combustion chamber. An air supply port is provided in the fuel placement part, and when the fuel is ignited, combustion air is supplied from below the fuel to burn it.

[0003] There are also models that have a secondary air supply port at the top of the combustion chamber. By supplying secondary combustion air from the secondary air supply port above the fuel, the unburned gas generated from the fuel can be burned, thereby suppressing the generation of incomplete combustion gas and smoke (see Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Utility Model Registration No. 3237480 Summary of the Invention [Problem to be solved by the invention]

[0005] In the case of the combustor described in Patent Document 1, secondary combustion air is not supplied sufficiently to the upper part of the combustion chamber from the start of combustion until the temperature of the combustor body rises, so that the unburned gas generated from the fuel cannot be burned, and incomplete combustion gas and smoke are likely to be generated.

[0006] In addition, if the air supply port becomes blocked by the fuel poured into the fuel placement section, the supply of combustion air to the combustion chamber will be insufficient, and even if the fuel is ignited, the fire may go out or the flame may not grow large.

[0007] An object of the present invention is to provide a solid fuel combustor capable of burning solid fuel by stably supplying combustion air from the start of combustion. [Means for solving the problem]

[0008] The present invention has been made to solve the above-mentioned problems, and provides a combustor body 1 having a bottom plate 1A and side plates 1B and 1C rising from the edges of the bottom plate 1A, a fuel placement section 2 arranged on the bottom plate 1A at a distance within the combustor body 1, a primary air chamber 4 formed between the bottom plate 1A and the fuel placement section 2, a combustion chamber 3 formed above the fuel placement section 2 and in which solid fuel is burned, a secondary air chamber 5 consisting of the side plate 1B and an outer wall section 5A arranged on the outside of the side plate 1B at a distance and adjacent to the combustion chamber 3, an air intake 40 formed in the lower part of the side plate 1C for taking in air from an external space into the primary air chamber 4, and a front This solid fuel combustor is equipped with a primary air supply port 20 formed in the fuel mounting portion 2 for supplying air from the primary air chamber 4 to the combustion chamber 3, a second air intake port 50 formed in the lower part of the outer wall portion 5A for taking in air from the external space to the secondary air chamber 5, and a secondary air supply port 30 formed in the upper part of the side plate 1B for supplying air from the secondary air chamber 5 to the combustion chamber 3, and is characterized in that the side plate 1B has a second secondary air supply port 31 located at a height between the secondary air supply port 30 and the fuel mounting portion 2 and supplying air from the secondary air chamber 5 to the combustion chamber 3.

[0009] The side plate 1B has a vent 41 located at a height between the fuel placement portion 2 and the bottom plate 1A, which communicates the primary air chamber 4 and the secondary air chamber 5. When fuel in the combustion chamber 3 is burned, the air in the primary air chamber 4 passes through the primary air supply port 20 and is supplied to the combustion chamber 3, and the air in the external space of the combustor body 1 passes through the air intake 40 and is supplied to the primary air chamber 4, while the air in the secondary air chamber 5 passes through the vent 41 and is supplied to the primary air chamber 4. If the primary air supply port 20 is partially blocked by fuel or the like, the amount of air supplied from the primary air chamber 4 to the combustion chamber 3 decreases. In this case, the air in the secondary air chamber 5 does not flow toward the primary air chamber 4, and the amount of air supplied from the second secondary air supply port 31 to the combustion chamber 3 increases, which acts to eliminate the air shortage in the combustion chamber 3.

[0010] Further, the total opening area of ​​the secondary air supply port 30 is set to be larger than the total opening area of ​​the second secondary air supply port 31. Until the temperature of the secondary air chamber 5 rises, air is supplied from the second secondary air supply port 31 to the combustion chamber 3 to burn the unburned gas, and after the temperature of the secondary air chamber 5 rises, the amount of air supplied to the combustion chamber 3 through the secondary air supply port 30 increases, so that the unburned gas can be burned in the upper part of the combustion chamber 3.

[0011] Also, the total opening area of ​​the secondary air supply port may be set to be larger than the total opening area of ​​the second secondary air supply port, and the total opening area of ​​the vent may be set to be equal to or smaller than the total opening area of ​​the secondary air supply port and larger than the total opening area of ​​the second secondary air supply port. In a state in which air is supplied to the combustion chamber 3 from the primary air supply port 20 during combustion, the air is dispersed between the air sent from the vent 41 to the primary air chamber 4 and the air sent from the secondary air supply port 30 and the second secondary air supply port 31 to the combustion chamber 3, so that the combustion can be stabilized. When the primary air supply port 20 is partially blocked by fuel or the like and the amount of air supplied from the primary air chamber 4 to the combustion chamber 3 is reduced, the amount of air supplied to the combustion chamber 3 through the second secondary air supply port 31 can be increased to eliminate the air shortage.

[0012] In addition, the total opening area of ​​the air intake 40 and the vent 41 may be set to be less than or equal to the total opening area of ​​the primary air supply port 20, and the air supplied from the primary air chamber 4 through the primary air supply port 20 to the combustion chamber 3 may be adjusted by the opening area of ​​the air intake 40 and the vent 41. Effect of the Invention

[0013] According to the configuration of the present invention, secondary combustion air is supplied at an early stage after the start of combustion, making it possible to burn unburned gas and enabling stable combustion from ignition until the temperature of the combustor body 1 rises, thereby realizing a solid fuel combustor that produces little incomplete combustion gas and smoke.

[0014] Furthermore, even if the primary air supply port 20 of the fuel placement section 2 becomes blocked by fuel or the like, the supply of primary combustion air to the combustion chamber 3 can be ensured, so that the flame will not go out after the fuel is ignited, and the fuel can be burned to the end. [Brief description of the drawings]

[0015] [Figure 1] 1 is a perspective view of a solid fuel combustor according to an embodiment of the present invention; [Diagram 2] 1 is a plan view of a solid fuel combustor according to an embodiment of the present invention. FIG. [Diagram 3] 1 is a side view of a solid fuel combustor according to an embodiment of the present invention. [Figure 4] 3 is a cross-sectional view taken along line VV shown in FIG. 2. [Diagram 5] 3 is a cross-sectional view taken along the line VI-VI shown in FIG. 2. [Figure 6] FIG. 2 is an explanatory diagram showing a state during combustion. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a solid fuel combustor of the present invention will be described with reference to the drawings.

[0017] Fig. 1 is a perspective view of a solid fuel combustor according to an embodiment of the present invention, Fig. 2 is a plan view of the solid fuel combustor, Fig. 3 is a side view of the solid fuel combustor, Fig. 4 is a cross-sectional view taken along line VV in Fig. 2, and Fig. 5 is a cross-sectional view taken along line VI-VI in Fig. 2. The solid fuel combustor according to this embodiment comprises a combustor body 1, a fuel placement section 2, a combustion chamber 3, a primary air chamber 4, and a secondary air chamber 5.

[0018] The combustor body 1 has a bottom plate 1A and side plates 1B and 1C rising from the edges of the bottom plate 1A, and is configured as a box-shaped body with an open top.

[0019] As shown in Figures 4 and 5, the fuel placement section 2 is composed of flat plates arranged at intervals on the bottom plate 1A inside the combustor body 1. The combustion chamber 3 is composed of the space surrounded by the side plates 1B and 1C inside the combustor body 1 above the fuel placement section 2. The primary air chamber 4 is composed of the space surrounded by the bottom plate 1A and the side plates 1B and 1C of the combustor body 1 below the fuel placement section 2.

[0020] The secondary air chamber 5 is formed adjacent to the combustion chamber 3 of the combustor body 1. As shown in Fig. 4, the secondary air chamber 5 is formed of a space surrounded by a side plate 1B, an outer wall portion 5A arranged on the outside of the side plate 1B, and an upper wall portion 5B, a lower wall portion 5C, and a side wall portion 5D that are provided between the side plate 1B and the outer wall portion 5A.

[0021] The lower surface of the bottom plate 1A of the combustor body 1 is provided with legs 1D. The combustor body 1 is placed on the ground by the legs 1D to prevent the bottom plate 1A from directly touching the ground. The legs 1D have a rotating shaft portion 1d and are foldable, so that the legs 1D can be folded and stored under the bottom plate 1A, making it possible to carry and store the combustor body in a compact manner.

[0022] The side plate 1C of the combustor body 1 is provided with an air intake 40 that communicates with the external space and the primary air chamber 4. As shown in Fig. 4, the air intake 40 is composed of multiple long holes 40a arranged horizontally at a position lower than the fuel placement part 2, and air outside the combustor body 1 flows into the primary air chamber 4 through the air intake 40.

[0023] The fuel placement portion 2 is provided with a primary air supply port 20 that communicates between the primary air chamber 4 and the combustion chamber 3. As shown in Fig. 2, the primary air supply port 20 is composed of a plurality of through holes 20a arranged in the fuel placement portion 2, and air in the primary air chamber 4 is supplied to the combustion chamber 3 through the primary air supply port 20.

[0024] In addition, at both ends of the fuel placement portion 2 on the side plate 1C side, there are through holes 20b having a larger diameter than the other through holes 20a, and the through holes 20b are configured to allow a greater amount of air to pass through than the other through holes 20a.

[0025] The lower wall portion 5C is provided with a second air intake 50 that communicates between the external space and the secondary air chamber 5. As shown in Fig. 3, the second air intake 50 is composed of a plurality of elongated holes 50a arranged in two rows along the longitudinal direction of the lower wall portion 5C at a position lower than the fuel placement portion 2, and air in the external space of the combustor body 1 flows into the secondary air chamber 5 through the second air intake 50.

[0026] The side plate 1B is provided with a vent hole 41 that connects the secondary air chamber 5 and the primary air chamber 4, and a secondary air supply port 30 and a second secondary air supply port 31 that connect the secondary air chamber 5 and the combustion chamber 3.

[0027] As shown in FIG. 5, the ventilation opening 41 is composed of a plurality of long holes 41a arranged along the longitudinal direction at a position lower than the fuel placement portion 2 and higher than the second air intake 50, and a portion of the air that passes through the second air intake 50 and flows into the secondary air chamber 5 passes through the ventilation opening 41 and flows into the primary air chamber 4.

[0028] As shown in FIG. 5, the secondary air supply port 30 is composed of a plurality of through holes 30a arranged along the longitudinal direction near the upper end of the side panel 1B, and the second secondary air supply port 31 is composed of a plurality of through holes 31a arranged along the longitudinal direction at a position higher than the fuel loading portion 2, and air that rises in the secondary air chamber 5 without passing through the vent 41 is supplied to the combustion chamber 3 through the secondary air supply port 30 and the second secondary air supply port 31.

[0029] The total opening area of ​​the secondary air supply port 30 is set to be larger than the total opening area of ​​the second secondary air supply port 31, and the total opening area of ​​the vent port 41 is set to be equal to or smaller than the total opening area of ​​the secondary air supply port 30 and larger than the total opening area of ​​the second secondary air supply port 31. The opening areas of the vent port 41, secondary air supply port 30, and second secondary air supply port 31 are adjusted so that the amount of air sent to the primary air chamber 4 through the vent port 41 and the amount of air supplied to the combustion chamber 3 through the secondary air supply port 30 and the second secondary air supply port 31 are balanced to stabilize combustion.

[0030] In addition, the total opening area of ​​the air intakes 40 and the vents 41 is set to be smaller than the total opening area of ​​the primary air supply ports 20 formed in the fuel placement portion 2. By controlling the amount of air flowing into the primary air chamber 4 by the opening areas of the air intakes 40 and the vents 41, the amount of air supplied from the primary air chamber 4 through the primary air supply ports 20 to the combustion chamber 3 is adjusted to be an optimal amount for burning the fuel F.

[0031] The height at which fuel F can be introduced into the combustion chamber 3 is determined, and the secondary air supply port 31 is provided so as to be positioned higher than the top of the fuel F when the fuel F is introduced to the predetermined height in the combustion chamber 3, and air that has passed through the secondary air supply port 31 is supplied above the fuel F. On the other hand, the second secondary air supply port 31 is provided so as to be positioned lower than the top of the fuel F when the fuel F is introduced to the predetermined height in the combustion chamber 3, and air that has passed through the second secondary air supply port 31 is supplied toward the side of the fuel F.

[0032] Figure 6 explains the state when fuel is burned in a solid fuel combustor. (a) shows the state immediately after ignition, (b) shows the state in the early stage of combustion, and (C) shows the state when combustion has spread throughout.

[0033] When using a solid fuel combustor, fuel F such as firewood is put into the upper opening of the combustor body 1 and set on the fuel placement part 2, and the fuel F is ignited using an ignition device such as a lighter or a match. When the fuel F is ignited and combustion starts, as shown in FIG. 6(a), the air in the primary air chamber 4 passes through the primary air supply port 20 and is sent to the combustion chamber 3, and primary combustion air is supplied to the fuel F. When the air in the primary air chamber 4 is supplied to the combustion chamber 3, air in the external space of the combustor body 1 flows into the primary air chamber 4 from the air intake 40. In addition, air in the secondary air chamber 5 passes through the vent 41 and flows into the primary air chamber 4, and air in the external space of the combustor body 1 flows into the secondary air chamber 5 from the second air intake 50.

[0034] The air flowing in from the air intake 40 and the vent 41 diffuses throughout the primary air chamber 4, and air is supplied to the combustion chamber 3 in a dispersed state from the entire primary air supply port 20.

[0035] When the temperature of the combustion chamber 3 rises due to the combustion of the fuel F, and the temperature of the side plate 1B rises due to the radiant heat of the flame, the air in the secondary air chamber 5 is heated and an updraft is generated. As shown in Fig. 6(b), air flows into the secondary air chamber 5 from the external space of the combustor body 1 through the second air intake 50, and some of the air in the secondary air chamber 5 flows into the primary air chamber 4 through the vent 41, while the rest of the air rises inside the secondary air chamber 5 and is supplied to the combustion chamber 3 through the second secondary air supply port 31.

[0036] The air supplied to the combustion chamber 3 from the second secondary air supply port 31 is sent to the side of the flame formed in the combustion chamber 3, and burns unburned gas that could not be burned by the air supplied from the primary air supply port 20. Therefore, even in the initial stage of combustion immediately after the start of combustion and before the flame grows large, the air supplied to the combustion chamber 3 from the second secondary air supply port 31 stabilizes the combustion and suppresses the generation of smoke and unburned gas.

[0037] Thereafter, the flame spreads over the entire fuel F set in the fuel placement section 2, and when the combustion flame grows to a size that reaches the top opening of the combustion chamber 3, the temperature in the secondary air chamber 5 rises and the rising air current becomes stronger. As shown in Figure 6(c), the air rising in the secondary air chamber 5 reaches the upper wall section 5B and flows into the combustion chamber 3 through the secondary air supply port 30.

[0038] The air supplied to the combustion chamber 3 from the secondary air supply port 30 is sent above the fuel F charged into the combustion chamber 3, and burns the unburned gas that could not be combusted by the air supplied from the primary air supply port 20 and the second secondary air supply port 31.

[0039] After the flame grows larger, the air supplied to the combustion chamber 3 from both the second secondary air supply port 31 and the secondary air supply port 30 brings the combustion closer to complete, thereby suppressing the generation of smoke and incompletely combusted gas from the combustor body 1.

[0040] In addition, in the structure of this embodiment, since the side plate 1C is not provided with a secondary air supply port, the amount of air near both ends of the side plate 1C side in the combustion chamber 3 is small. However, in this embodiment, since the fuel loading portion 2 has large-diameter through holes 20b at both ends on the side plate 1C side, the amount of primary air supplied flowing from the primary air chamber 4 to the combustion chamber 3 is increased in this portion, thereby preventing insufficient air combustion near both ends on the side wall 1C side of the combustion chamber 3.

[0041] The bottom plate 1A also functions as an ash receiver, and ash generated when the fuel F on the fuel placement portion 2 is burned drops from the primary air supply port 20 and accumulates on the bottom plate 1A.

[0042] One side of the side plate 1C is detachably attached to the combustor body 1. As shown in Fig. 5, the side plate 1C is provided with an engagement piece 6 formed on the inside of the side end of the side plate 1B and a slit groove 7 formed in the bent portion at both ends of the side plate 1C. The slit groove 7 engages with the engagement piece 6, whereby the side plate 1C is attached to the side end of the side plate 1B.

[0043] The fuel placement part 2 is also detachably attached inside the combustor body 1. As shown in Fig. 5, the fuel placement part 2 is attached to the combustor body 1 by placing both ends of the fuel placement part 2 on L-shaped locking pieces 8 provided on the inner side of the side plate 1B.

[0044] When discarding ash that has accumulated on the fuel placement section 2 or the bottom plate 1A, the side plate 1C can be removed from the combustor body 1, the side end can be opened, and the combustor body 1 can be tilted to discard the ash that has accumulated on the bottom plate 1A and the fuel placement section 2 and the unburned fuel F from the open side end.

[0045] In addition, the bottom plate 1A can be easily cleaned by removing the fuel placement part 2 from the combustor body 1. The large diameter through hole 20b provided in the fuel placement part 2 serves as a handle when removing the fuel placement part 2. When removing the fuel placement part 2, it can be pulled out sideways by putting a finger in the large diameter through hole 20b, improving workability.

[0046] In a solid fuel combustor such as that of the present invention, the primary air supply port 20 formed in the fuel loading section 2 may become partially blocked by the fuel F placed on the fuel loading section 2 or ash generated by combustion, which may reduce the amount of air supplied from the primary air chamber 4 through the primary air supply port 20 to the combustion chamber 3.

[0047] When the primary air supply port 20 is blocked, the air flow in the primary air chamber 4 is impeded, and the amount of air flowing from the secondary air chamber 5 through the vent port 41 into the primary air chamber 4 decreases. In that case, the amount of air flowing upward in the secondary air chamber 5 increases, which acts to increase the amount of air flowing into the combustion chamber 3 through the secondary air supply port 30 and the second secondary air supply port 31.

[0048] Then, the air acts as primary combustion air by increasing the amount of air supplied to the side of the fuel F placed on the fuel placement section 2 through the second air supply port 31. Therefore, even if the primary air supply port 20 is blocked, it is possible to prevent combustion with insufficient air, and it is possible to suppress the fuel F from being quickly extinguished due to insufficient air after ignition, or the generation of smoke or incomplete combustion gas. [Explanation of symbols]

[0049] 1. Combustor body 1A bottom plate 1B Side plate 1C side plate 2 Fuel storage area 3. Combustion chamber 4 Primary air chamber 5 Secondary air chamber 20 Primary air supply port 30 Secondary air supply port 31 Secondary air supply port 40 Air Intake 41 Vent 50 Second Air Intake

Claims

1. a combustor body having a bottom plate and a side plate rising from an edge of the bottom plate; a fuel placement portion disposed on the bottom plate within the combustor body and spaced apart from one another; a primary air chamber formed between the bottom plate and the fuel placement portion; a combustion chamber formed above the fuel placement portion and in which solid fuel is burned; a secondary air chamber adjacent to the combustion chamber, the secondary air chamber being configured with the side plate and an outer wall portion spaced apart from the outside of the side plate; an air intake formed in a lower portion of the side plate for taking in air from an external space into the primary air chamber; a primary air supply port formed in the fuel placement portion for supplying air from the primary air chamber to the combustion chamber; a second air intake formed in a lower portion of the outer wall portion and adapted to take in air from an external space into the secondary air chamber; A solid fuel combustor comprising: a secondary air supply port formed in an upper portion of the side plate for supplying air from the secondary air chamber to the combustion chamber, A solid fuel combustor characterized in that the side plate has a second secondary air supply port located at a height between the secondary air supply port and the fuel placement portion, which supplies air from the secondary air chamber to the combustion chamber.

2. 2. The solid fuel combustor according to claim 1, wherein the side plate has an air vent located at a height between the fuel placement portion and the bottom plate, the air vent communicating the primary air chamber with the secondary air chamber.

3. 2. The solid fuel combustor according to claim 1, wherein a total opening area of ​​said secondary air supply ports is set to be larger than a total opening area of ​​said second secondary air supply ports.

4. 3. The solid fuel combustor according to claim 2, characterized in that a total opening area of ​​the secondary air supply port is set larger than a total opening area of ​​the second secondary air supply port, and a total opening area of ​​the ventilation opening is set to be equal to or smaller than a total opening area of ​​the secondary air supply port and larger than a total opening area of ​​the second secondary air supply port.

5. 3. The solid fuel combustor according to claim 2, wherein a total opening area of ​​said air intake and said vent is set to be equal to or less than a total opening area of ​​said primary air supply port.

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