Solid fuel combustor

Abstract

The present invention provides a solid fuel combustor that suppresses soot buildup on the reflector and maintains the reflector's effectiveness for a longer period, even when the reflector is positioned adjacent to the combustion chamber. [Solution] The combustion chamber 1 has a fuel mounting section 2 on which solid fuel is placed and a combustion chamber 3 on which the solid fuel is burned. The combustion chamber 1 has a removable reflector 7 installed on the upper rear of the combustion chamber 1, which reflects the radiant heat of the flame and radiates it forward. The reflector 7 is located behind the back plate 1C of the combustion chamber 1, forming a predetermined gap 8 between the reflector 7 and the combustion chamber 1, and the accumulation of soot on the reflector 7 is suppressed by air passing through the gap 8, thereby maintaining the heating effect for a longer period of time.

Description

Technical Field

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

Background Art

[0002] There is a solid fuel burner called a brazier used in camping etc. The brazier described in Patent Document 1 includes a hearth on which firewood serving as fuel is placed, a reflector disposed adjacent to the hearth, and a pedestal that supports the hearth and the reflector. The hearth and the reflector are rectangular, and the length of the long side of the reflector is the same as the length of the long side of the hearth. The reflector is erected on the edge of the hearth such that the long side of the reflector and the long side of the hearth are aligned with each other. Heat generated by the combustion of the fuel placed on the hearth is reflected by the reflector and directed forward (see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a configuration where a reflector is disposed adjacent to the hearth as in Patent Document 1, when the fuel disposed on the hearth burns, part of the flame generated on the hearth hits the reflector, and soot adheres to the reflector. A brazier used outdoors is affected by wind etc. and combustion is difficult to stabilize. When burning with insufficient air, the flame extends and is likely to hit the reflector, and the adhesion of soot to the reflector progresses, and there is a problem that the effect of the reflector decreases in a short time.

[0005] An object of the present invention is to provide a solid fuel burner that can suppress the adhesion of soot to the reflector and maintain the effect of the reflector for a long time even in a configuration where a reflector is disposed adjacent to the combustion part. Another object is to provide a solid fuel burner in which the reflector can be easily attached and detached, has versatility, and is easy to use. [Means for solving the problem]

[0006] This invention solves the above problems and is a solid fuel combustor having a base plate 1A, a front plate 1B, a back plate 1C, and a side plate 1D rising from the edge of the base plate 1A and having an open top, a fuel mounting section 2 provided inside the combustor body 1 on which solid fuel is placed, and a combustion chamber 3 formed in the space above the fuel mounting section 2 on which the solid fuel is burned, wherein the combustor body 1 has a removable reflector plate 7 installed on the upper rear part of the combustor body 1, the reflector plate 7 is located behind the back plate 1C of the combustor body 1 and is installed so as to have a predetermined gap 8 between the reflector plate 7 and the combustor body 1.

[0007] The reflector 7 has a central portion 7A positioned behind the back plate 1C of the combustor body 1 and approximately parallel to the back plate 1C, with both side portions 7B bent forward and positioned to intersect with the back plate 1C, and has a fitting portion 9 between the upper end of the back plate 1C and the lower end of the reflector 7 at the position where the back plate 1C and the reflector 7 intersect, so that the reflector 7 can be easily attached to the combustor body 1.

[0008] The reflector plate 7 is stably fixed to the combustor body by the side end portion 7b of the reflector plate 7 contacting the inner surface of the side plate 1D of the combustor body 1.

[0009] The combustion chamber body 1 may be provided with detachable brackets 11 on the back plate 1C and the side plate 1D, and the reflector 7 may be attached to the combustion chamber body via the brackets 11.

[0010] The reflector 7 has a central portion 7A positioned behind the back plate 1C of the combustor body 1 and approximately parallel to the back plate 1C, with both side portions 7B bent forward and positioned to intersect with the bracket 11. A fitting portion 9 is provided between the lower end of the reflector 7 and the upper end of the bracket 11 at the position where the reflector 7 and the bracket 11 intersect, and the side ends 7b of the reflector 7 abut against the wall surface of the bracket 11, allowing the reflector 7 to be easily attached and detached and stably fixed. [Effects of the Invention]

[0011] According to the configuration of the present invention, air passes through the gap 8 provided between the combustion chamber body 1 and the reflector plate 7, and an airflow is formed between the flame extending from the upper opening of the combustion chamber body 1 and the reflector plate 7. As a result, the flame is less likely to come into contact with the reflector plate 7, suppressing soot buildup and allowing the heating effect of the reflector plate 7 to be maintained for a longer period.

[0012] Furthermore, the reflector plate 7 can be easily attached to and detached from the combustor body 1, and the reflector plate 7 can be stably fixed in place. In addition, the reflector plate 7 can be attached even if the shape of the combustor body 1 is different, resulting in a versatile and user-friendly solid fuel combustor. [Brief explanation of the drawing]

[0013] [Figure 1] This is a perspective view of a solid fuel combustor according to an embodiment of the present invention. [Figure 2] This is a plan view of a solid fuel combustor according to an embodiment of the present invention. [Figure 3] Figure 2 shows a cross-sectional view along the VV line. [Figure 4] This is a perspective view of a reflector plate provided in a solid fuel combustor according to an embodiment of the present invention. [Figure 5] This is a perspective view of a solid fuel combustor according to another embodiment of the present invention. [Figure 6] This is a plan view of a solid fuel combustor according to another embodiment of the present invention. [Figure 7] This is a cross-sectional view taken along the line VI-VI, as shown in Figure 6. [Figure 8] It is an exploded perspective view of a reflector according to another embodiment of the present invention.

Embodiments for Carrying Out the Invention

[0014] Hereinafter, embodiments of the solid fuel combustor of the present invention will be described with reference to the drawings.

[0015] 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 sectional view taken along line V-V of FIG. 2, and FIG. 4 is a perspective view of a reflector. The solid fuel combustor of the present embodiment includes a combustor main body 1, a fuel placement part 2, a combustion chamber 3, and a reflector 7.

[0016] The combustor main body 1 has a bottom plate 1A, a front plate 1B, a back plate 1C, and side plates 1D that rise from the edge of the bottom plate 1A, and is configured as a box-shaped body with an open upper part.

[0017] As shown in FIG. 3, the fuel placement part 2 is composed of flat plates arranged at intervals on the bottom plate 1A inside the combustor main body 1. The combustion chamber 3 is configured as a space surrounded by the front plate 1B, the back plate 1C, and the side plates 1D inside the combustor main body 1 above the fuel placement part 2.

[0018] Below the fuel placement part 2, an air chamber 4 configured by a space surrounded by the bottom plate 1A of the combustor main body 1 and the front plate 1B, the back plate 1C, and the side plates 1D is provided. The side plate 1D of the combustor main body 1 has an air hole 1d that communicates the outside air and the air chamber 4. As shown in FIG. 3, the air hole 1d is composed of a horizontally long elongated hole arranged at a position lower than the fuel placement part 2.

[0019] The fuel placement part 2 has an air supply port 20 that communicates the air chamber 4 and the combustion chamber 3. As shown in FIG. 2, the air supply port 20 is composed of a plurality of through holes arranged in the fuel placement part 2.

[0020] The combustion chamber body 1 is equipped with legs 10 on the underside of its base plate 1A. The combustion chamber body 1 is placed on the ground by the legs 10, so that the base plate 1A does not directly touch the ground. The legs 10 can be folded and stored under the base plate 1A of the combustion chamber body 1, making it compact for transport and storage.

[0021] The reflector 7 is detachably attached to the back plate 1C side of the combustor body 1. As shown in Figure 2, the central part 7A of the reflector 7 is positioned behind the back plate 1C and approximately parallel to the back plate 1C, and both sides 7B are bent so as to face diagonally forward. Both sides 7B intersect with the back plate 1C of the combustor body 1, and the side ends 7b of both sides 7B abut against the inner surface of the side plate 1D of the combustor body 1. In this embodiment, the central part 7A of the reflector 7 is located approximately 15 mm behind the back plate 1C, and a gap 8 is formed between the central part 7A of the reflector 7 and the back plate 1C.

[0022] The upper end of the back plate 1C of the combustor body 1 has a slit groove 1c at the upper end where it intersects with both sides 7B of the reflector 7. On the other hand, both sides 7B of the reflector 7 have slit grooves 7c at the lower end where they intersect with the back plate 1C, and the slit grooves 1c and 7c constitute the fitting portion 9 between the back plate 1C and the reflector 7.

[0023] When attaching the reflector 7 to the combustor body 1, the slit grooves 7c on both sides 7B of the reflector 7 are aligned with the slit grooves 1c on the back plate 1C of the combustor body 1, and the reflector 7 is attached so that the slit grooves 7c and slit grooves 1c overlap. With the slit grooves 1c and slit grooves 7c engaged, the side ends 7b of both sides 7B abut against the inner surface of the side plate 1D of the combustor body 1, thereby suppressing movement and tilting of the reflector 7. Therefore, the reflector 7 is fixed to the combustor body 1 in a stable state without the need for fixing means such as screws.

[0024] When using a solid fuel combustor, firewood is placed into the combustor body 1 through the top opening and set on the fuel storage section 2. The fuel is then ignited using an ignition device such as a lighter or matches. Once the firewood is ignited and combustion begins, an updraft is generated near the fuel storage section 2, causing air from the air chamber 4 to pass through the air supply port 20 and flow into the combustion chamber 3, supplying air around the firewood. As air from the air chamber 4 flows into the combustion chamber 3, air from around the combustor body 1 passes through the air holes 1d in the side plate 1D and flows into the air chamber 4. Air is continuously supplied to the combustion chamber 3 during combustion.

[0025] The air supplied from the fuel supply port 20 promotes combustion, causing the flames to spread and grow throughout the firewood set in the fuel storage section 2, eventually reaching the upper opening of the combustion chamber body 1. In the upper part of the combustion chamber 3, the air mixes with the air near the upper opening of the combustor body 1, burning any unburned gases that could not be burned in the combustion chamber.

[0026] When the flame grows large enough to reach the upper opening of the combustion chamber body 1, the radiant heat from the flame can warm the area around the combustion chamber body 1. The reflector 7, installed on the back plate 1C, reflects the radiant heat directed towards the back plate 1C and radiates it forward. As a result, a high heating effect can be obtained on the front side of the combustion chamber body 1 from both the direct radiant heat from the flame and the radiant heat reflected by the reflector 7.

[0027] When a reflector plate 7 is installed on the back plate 1C of the combustion chamber body 1, the flame extending from the upper opening of the combustion chamber body 1 hits the reflector plate 7, causing soot to accumulate on it. When soot accumulates on the reflector plate 7, the efficiency of radiant heat reflection decreases, leading to a reduction in heating effectiveness. In particular, when combustion occurs in a state of insufficient air, the flame extends for a long time and produces a lot of soot, so a large amount of soot accumulates on the reflector plate 7 in a short time, and measures are needed to prevent soot from accumulating on the reflector plate 7.

[0028] In this configuration, there is a gap 8 between the back plate 1C and the reflector plate 7. During combustion, air below the reflector plate 7 passes through the gap 8 and rises, forming an airflow that moves upward along the reflector plate 7. The air that has passed through the gap 8 mixes with the combustion gas near the upper opening of the combustor body 1, suppressing flame extension due to insufficient air. As a result, the flame is less likely to hit the reflector plate 7, suppressing soot buildup and allowing the reflector plate 7 to maintain its effectiveness for a longer period.

[0029] In this embodiment, the gap 8 is set to 15 mm, but it is not limited to this value. The optimal dimensions will vary depending on the size and heating power of the solid fuel combustor, so the dimensions of the gap 8 should be set in such a way that it maintains good reflection efficiency while minimizing soot buildup.

[0030] Figure 5 is a perspective view of a solid fuel combustor according to another embodiment of the present invention, Figure 6 is a plan view of the solid fuel combustor, Figure 7 is a cross-sectional view taken along line VI-VI in Figure 6, and Figure 8 is an exploded perspective view of the reflector. The solid fuel combustor includes a secondary air chamber 5 adjacent to the combustion chamber 3. The secondary air chamber 5 is composed of a space enclosed by a front plate 1B and a back plate 1C, an outer wall portion 5A located outside the front plate 1B and back plate 1C, and a peripheral wall portion 5B. The peripheral wall portion 5B at the bottom of the secondary air chamber 5 is provided with secondary air holes 5b that connect the outside air to the secondary air chamber 5. The secondary air holes 5b are composed of a plurality of elongated holes located in the peripheral wall portion 5B.

[0031] The front plate 1B and the back plate 1C are provided with a secondary air supply port 30 that connects the combustion chamber 3 and the secondary air chamber 5. The secondary air supply port 30 consists of a plurality of through-holes arranged along the longitudinal direction of the front plate 1B and the back plate 1C at the top of the combustion chamber 3.

[0032] When using a solid fuel combustor, firewood is placed in the fuel storage section 2, but the amount of firewood stacked in the combustion chamber 3 should not exceed the height of the secondary air supply port 30. When the firewood is ignited using an ignition device such as a lighter or matches and combustion begins, an updraft is generated near the fuel storage section 2, and air from the air chamber 4 flows through the air supply port 20 into the combustion chamber 3 and is supplied to the firewood. When air from the air chamber 4 flows into the combustion chamber 3, air from around the combustor body 1 flows through the air holes 1d in the side plate 1D into the air chamber 4. Air is continuously supplied to the combustion chamber 3 during combustion.

[0033] The air supplied from the fuel supply port 20 promotes combustion, and as the flames spread and grow throughout the firewood set in the fuel storage section 2, reaching the upper opening of the combustor body 1, the temperature of the combustion chamber 3 rises. Additionally, the radiant heat from the flames raises the temperatures of the front plate 1B and back plate 1C, warming the air in the secondary air chamber 5 and generating an updraft. The air at the top of the secondary air chamber 5 passes through the secondary air supply port 30 and flows into the upper part of the combustion chamber 3, while the air surrounding the combustor body 1 passes through the secondary air holes 5b and flows into the lower part of the secondary air chamber 5. The air flowing in from the lower part of the secondary air chamber 5 is carried upwards by the updraft towards the upper part of the secondary air chamber 5.

[0034] The air flowing into the upper part of the combustion chamber 3 from the secondary air supply port 30 is sent above the firewood set in the combustion chamber 3, burning any unburned gases that could not be burned by the air supplied from the fuel supply port 20. Secondary combustion takes place in the upper part of the combustion chamber 3, bringing it closer to complete combustion, and a stable flame with minimal smoke and soot is formed at the upper opening of the combustor body 1.

[0035] In the above configuration, the combustor body 1 has an outer wall portion 5A and a peripheral wall portion 5B on the outside of the back plate 1C, and the reflector plate 7 cannot be directly attached to the back plate 1C. In this embodiment, as shown in Figures 5 to 8, the reflector plate 7 is attached to the combustor body 1 using a bracket 11.

[0036] As shown in Figures 6 and 8, the bracket 11 is a U-shaped member, with its side surface 11C resting on the peripheral wall portion 5B, and its front surface 11A and back surface 11B fitting together so as to sandwich the back plate 1C, peripheral wall portion 5B, and outer wall portion 5A. The end of the front surface 11A protrudes to the outside of the side plate 1D, and the lower end of the front surface 11A has a slit groove 11a that fits into the upper end of the side plate 1D. This restricts the movement of the bracket 11 in the front, back, left, and right directions, and positions and fixes it to the combustor body 1. The upper end of the side surface 11C has a slit groove 11c that fits into the slit groove 7c of the reflector plate 7, and the slit groove 7c of the reflector plate 7 and the slit groove 11c of the bracket 11 constitute a fitting portion 9.

[0037] When installing the reflector plate 7, first attach the bracket 11 to the combustor body 1, align the slit groove 7c of the reflector plate 7 with the slit groove 11c of the bracket 11, and install it so that the slit grooves 7c and 11c overlap. When the slit grooves 7c and 11c are fitted together, as shown in Figure 6, the side ends 7b of both sides 7B of the reflector plate 7 come into contact with the front wall 11A of the bracket 11, suppressing movement and tilting of the reflector plate 7. As a result, the reflector plate 7 is fixed to the combustor body 1 via the bracket 11, and a gap 8 is formed between the reflector plate 7 and the outer wall 5A.

[0038] In this embodiment, the gap 8 is set to 10 mm. Because the solid fuel combustor equipped with a secondary combustion structure suppresses flame extension and reduces soot generation, soot adhesion to the reflector 7 can be suppressed even if the gap 8 is narrowed. By narrowing the gap 8, the distance between the reflector 7 and the flame becomes shorter, thereby increasing the reflection efficiency. [Explanation of Symbols]

[0039] 1. Combustion unit 1A bottom plate 1B Front Panel 1C back plate 1D side plate 2. Fuel storage section 3 Combustion chamber 7 Reflector 7A central part 7B Both ends 7b Side edge 8 intervals 9. Fitting part 11 brackets

Claims

1. A combustion chamber body consisting of a base plate, and a front plate, back plate, and side plate rising from the edge of the base plate, with an opening at the top, A solid fuel combustor having a fuel mounting section provided within the combustor body on which solid fuel is placed, and a combustion chamber formed in the space above the fuel mounting section on which the solid fuel is burned, The combustion chamber body has a removable reflector plate installed on the upper rear part, A solid fuel combustor characterized in that the reflector is located behind the back plate of the combustor body and is installed so as to have a predetermined gap between the reflector and the combustor body.

2. The reflector is positioned such that its central portion is behind the back plate of the combustor body and is substantially parallel to the back plate, and both sides are bent forward and intersect with the back plate. The solid fuel combustor according to claim 1, characterized in that it has a fitting portion between the upper end of the back plate and the lower end of the reflector at the position where the back plate and the reflector intersect.

3. The solid fuel combustor according to claim 2, characterized in that the reflector's side end abuts against the inner surface of the side plate of the combustor body.

4. The solid fuel combustor according to claim 1, characterized in that the combustor body is provided with detachable brackets on the back plate and the side plate, and the reflector is attached to the combustor body via the brackets.

5. The reflector is positioned such that its central portion is behind the back plate of the combustor body and is substantially parallel to the back plate, and both sides are bent forward and intersect with the bracket. The solid fuel combustor according to claim 4, wherein there is a fitting portion between the lower end of the reflector and the upper end of the bracket at the position where the reflector and the bracket intersect, and the side end of the reflector abuts against the wall surface of the bracket.

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