Fully Combustion-supporting Stove

TECHNICAL FIELD

[0001]The present invention relates to the field of stoves, and particularly relates to a fully combustion-supporting stove.

BACKGROUND TECHNOLOGY

[0002]Stoves are primarily fire-making appliances fueled by materials like firewood and charcoal. Existing stoves in the related art typically comprise a stove body, an inner liner connected inside the body, and an ash receiving pan spaced below the liner. A combustion chamber is formed within the liner, with ash leakage holes at the liner’s bottom, and an air inlet for external gas to enter the stove body is provided at the lower end of the body’s side wall. In use, negative pressure from fuel combustion in the chamber draws external air sequentially through the air inlet, the gap between the ash receiving pan and the liner, and the ash leakage holes into the combustion chamber, mixing with the fuel to support combustion. However, in this configuration, external air can only enter the chamber through the bottom ash leakage holes to assist combustion, resulting in only a single combustion stage for the fuel. Furthermore, during this single combustion, factors such as insufficient oxygen supply and incomplete fuel combustion lead to extremely low combustion efficiency. A large amount of combustible substances—including unburned fuel particles and carbon monoxide—are directly emitted with the flue gas, causing environmental pollution and endangering human health.

DISCLOSURE OF THE INVENTION

[0003]The present invention aims to address the shortcomings in the prior art by providing a fully combustion-supporting stove, which can achieve secondary and tertiary combustion support, enabling the fuel to burn more fully and thoroughly, thereby increasing the fuel's burning power and combustion efficiency, and greatly reducing the emission of harmful smoke.

[0004]The technical solution adopted by the present invention is: a fully combustion-supporting stove, including a combustion structure, a support structure, an air guiding structure capable of regulating air volume, an ash pan, and a grate located directly above the ash pan. The combustion structure has an inner cavity structure, an outer cavity structure, and a combustion chamber, wherein the said combustion chamber is inwardly defined by the inner cavity structure. The support structure is detachably connected to the lower part of the said combustion structure, and the said support structure includes support legs for placement on a supporting surface. A gap is provided along the wall of the support structure between adjacent support legs, with an air inlet channel formed by the gap. The said air guiding structure is set directly below the combustion chamber and connected to the support structure, and the said air guiding structure has several air guide channels arranged circumferentially.

[0005]The ash pan is connected to the upper part of the air guiding structure via a first connection structure, and the said ash pan has several Vent Holes One along its side wall. The said grate is removably placed on the ash pan, and the said grate has several Air Outlet Holes One. As well as a first air guide path group for supplying external air into the combustion chamber for combustion support, a second air guide path group whose air outlet is located above the air outlet of the first air guide path group, and a third air guide path group whose air outlet is located above the air outlet of the second air guide path group. The said Vent Holes One are arranged on the first air guide path group, and the said Air Outlet Holes One form the air outlet of the first air guide path group. The air outlet of the second air guide path group is arranged around the middle of the combustion chamber, and the air outlet of the third air guide path group is arranged around the upper part of the combustion chamber.

[0006]Preferably, the said first air guide path group includes a first path segment formed by entering from the air inlet channel of the said gap and passing through the air guide channels of the air guiding structure, and a second path segment formed by the area enclosed between the inner wall of the outer cavity structure and the outer wall of the ash pan, flowing upward from the top of the said air guiding structure. The width of the said second path segment gradually decreases from bottom to top for flow guidance.

[0007]Preferably, the said first air guide path group further includes a third path segment arranged upward from the Vent Holes One of the said ash pan and passing through the Air Outlet Holes One of the grate. The said Vent Holes One are arranged near the upper end of the ash pan side wall, and the said Air Outlet Holes One form the air outlet of the first air guide path group.

[0008]Preferably, the said ash pan includes a pan bottom plate, a pan side plate extending upward from the circumference of the pan bottom plate, and a pan rim structure formed by outwardly flanging the top of the pan side plate. The said pan rim structure is nested within the inner cavity structure, the said grate is removably placed on the pan rim structure, and the said Vent Holes One are located on the pan side plate near the pan rim structure.

[0009]Preferably, the said air guiding structure has a central region arranged directly below the pan bottom plate, and a peripheral region arranged surrounding the central region. A portion of the air guide channels is set in the central region of the air guiding structure, and the other portion of the air guide channels is set in the peripheral region of the air guiding structure. The said pan bottom plate is spaced above the air guiding structure. The said first connection structure includes several support feet arranged circumferentially between the pan bottom plate and the air guiding structure. An interval region connecting the air guide channels of the central region is formed between adjacent support feet.

[0010]Preferably, the said inner cavity structure includes a lower inner cavity part, a middle inner cavity part, an upper inner cavity part, a lower support platform formed by outwardly flanging the bottom of the lower inner cavity part, and an upper support platform formed by outwardly flanging the top of the upper inner cavity part. The said lower support platform is spaced above the air guiding structure, and the outer end of the lower support platform is combined with the inner wall of the outer cavity structure. The said lower support platform is penetrated by several vent holes two. The outer end of the said upper support platform is combined with the outer cavity structure. The circumferential size of the said upper inner cavity part is larger than the circumferential size of the lower inner cavity part. The lower end of the said middle inner cavity part is combined with the lower inner cavity part, and the upper end is combined with the upper inner cavity part to form a wedge structure that is smaller at the bottom and larger at the top. The said middle inner cavity part is penetrated by several Air Outlet Holes Two, and the said Air Outlet Holes Two form the air outlet of the second air guide path group. The said upper inner cavity part is penetrated by several Air Outlet Holes Three, and the said Air Outlet Holes Three form the air outlet of the third air guide path group.

[0011]Preferably, the said second air guide path group includes a first path segment formed by entering from the air inlet channel of the said gap and passing through the Vent Holes One of the air guiding structure, a second path segment formed by the area enclosed between the inner wall of the outer cavity structure and the outer wall of the ash pan, flowing upward from the top of the said air guiding structure, a fourth path segment formed by the area enclosed between the inner wall of the outer cavity structure and the outer wall of the lower inner cavity part, flowing upward from the vent holes two of the said lower support platform, and a fifth path segment arranged upward and formed by the area enclosed between the inner wall of the said outer cavity structure and the outer wall of the middle inner cavity part. Part of the air flowing along the fifth path segment can enter the combustion chamber through the Air Outlet Holes Two. The width of the said second path segment gradually decreases from bottom to top for flow guidance, the width of the said fourth path segment is smaller than the width of the second path segment, and the width of the said fifth path segment gradually decreases from bottom to top for flow guidance.

[0012]Preferably, the said middle inner cavity part is set as a conical annular plate structure, and the outer diameter of the middle inner cavity part gradually increases from bottom to top, the inner diameter of the middle inner cavity part gradually increases from bottom to top, and the said Air Outlet Holes Two are arranged along an inclined upward direction.

[0013]Preferably, the said third air guide path group includes a first path segment formed by entering from the air inlet channel of the said gap and passing through the Vent Holes One of the air guiding structure, a second path segment formed by the area enclosed between the inner wall of the outer cavity structure and the outer wall of the ash pan, flowing upward from the top of the said air guiding structure, a fourth path segment formed by the area enclosed between the inner wall of the outer cavity structure and the outer wall of the lower inner cavity part, flowing upward from the vent holes two of the said lower support platform, a fifth path segment arranged upward and formed by the area enclosed between the inner wall of the said outer cavity structure and the outer wall of the middle inner cavity part, and a sixth path segment arranged upward and formed by the area enclosed between the inner wall of the said outer cavity structure and the outer wall of the upper inner cavity part. Part of the air flowing along the fifth path segment can enter the combustion chamber through the Air Outlet Holes Two. Part of the air flowing along the sixth path segment can enter the combustion chamber through the Air Outlet Holes Three. The width of the said second path segment gradually decreases from bottom to top for flow guidance, the width of the said fourth path segment is smaller than the width of the second path segment, and the width of the said fifth path segment gradually decreases from bottom to top for flow guidance.

[0014]Preferably, the said air guiding structure is arranged above the air inlet channel. The air guiding structure includes a support plate and a regulating plate coaxially arranged beneath the support plate. The outer peripheral side of the said support plate is combined with the inner side of the wall of the support structure. After combination, an installation area is formed around the outer periphery of the top of the said support plate and the inner side of the wall of the support structure, which is used for removably placing the combustion structure. The said ash pan is connected to the support plate via a first connection structure. The said regulating plate is rotatably connected to the support plate via a rotation shaft arranged along the axis of the support plate. The said air guide channels include air inlet holes penetrating the support plate, and corresponding regulating holes penetrating the regulating plate. The said regulating plate can rotate relative to the support plate between a fully open position and a closed position. In the fully open position, the said regulating holes and air inlet holes are arranged opposite each other and communicate with each other. In the closed position, the said regulating holes and air inlet holes are staggered relative to each other, and the regulating holes are blocked by the support plate, while the air inlet holes are blocked by the regulating plate.

[0015]The beneficial effect achieved by the present invention is: the stove of the present invention, by setting the first air guide path group for supplying external air into the combustion chamber for combustion support, the second air guide path group whose air outlet is located above the air outlet of the first air guide path group, and the third air guide path group whose air outlet is located above the air outlet of the second air guide path group, enables the fuel to mix with the air introduced by the first air guide path group into the combustion chamber for primary combustion. Simultaneously, a large amount of combustible materials such as fuel debris and carbon monoxide produced during the primary combustion rise due to the thrust of the combustion airflow and mix with the air introduced by the second air guide path group into the combustion chamber for secondary combustion. At the same time, a small amount of fuel debris and carbon monoxide and other combustibles missed during the secondary combustion continue to rise due to the thrust of the combustion airflow and mix with the air introduced by the third air guide path group into the combustion chamber for tertiary combustion. This achieves secondary and tertiary combustion support, enabling the fuel to burn more fully and thoroughly, thereby increasing the fuel's burning power and combustion efficiency, and greatly reducing the emission of harmful smoke. Furthermore, the Vent Holes One are arranged on the first air guide path group, and the Air Outlet Holes One form the air outlet of the first air guide path group, with the grate located directly above the ash pan. That is to say, the first air guide path group introduces air into the combustion chamber for combustion support through the Vent Holes One on the side wall of the ash pan and the Air Outlet Holes One on the grate. Compared to the structure in the existing technology where air enters the combustion chamber through the horizontal gap between the ash receiving pan and the inner liner and the ash leakage holes, the air in this part of the guide path in the present invention always flows upward, resulting in smaller air flow resistance. This is more conducive to introducing sufficient air into the combustion chamber for combustion support, and since the air outlet of the first air guide path group is set on the grate, and the grate is located directly above the ash pan and removably placed on the ash pan, the grate can be taken out separately to clean the air outlet of the first air guide path group, which is convenient for cleaning. The air outlet of the second air guide path group is arranged around the middle of the combustion chamber, and the air outlet of the third air guide path group is arranged around the upper part of the combustion chamber. This allows the air drawn into the combustion chamber through the air outlet of the second air guide path group and the air outlet of the third air guide path group to generate a swirling effect, thereby improving the mixing effect of air with fuel, fuel debris, and carbon monoxide and other combustibles, enabling the fuel to burn more fully. The air guiding structure is set directly below the combustion chamber, and the air guiding structure has several air guide channels arranged circumferentially. External air can enter the combustion structure through the air inlet channel formed by the gap between adjacent support legs and the air guide channels on the air guiding structure directly below the combustion chamber. Compared to the existing technology where the air inlet is directly set on the side wall of the stove body, the present invention is less susceptible to external environmental factors such as wind direction, making the air drawn into the combustion structure more adequate and uniform, resulting in better combustion support. The air guiding structure can regulate the air volume, which can meet the needs for different fire powers, making the scope of application wider. The support structure is detachably connected to the lower part of the combustion structure, the air guiding structure is connected to the support structure, and the ash pan is connected to the upper part of the air guiding structure via the first connection structure. This allows the ash pan, the air guiding structure, and the support structure to be detached as a whole relative to the combustion structure, which is convenient for emptying the ash from the ash pan, making it very convenient to use.

[0016]Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or be learned by practice of the invention.

DESCRIPTION OF DRAWINGS

[0017]The accompanying drawings, which are incorporated in and constitute a part of this application, are intended to provide a further understanding of the invention and illustrate schematic embodiments of the invention and, together with the description, serve to explain the invention but do not constitute an undue limitation of the invention. In the drawings:

[0018]FIG. 1 is a schematic structural diagram one of the stove according to an embodiment of the present invention.

[0019]FIG. 2 is a schematic structural diagram two of the stove according to an embodiment of the present invention.

[0020]FIG. 3 is a schematic cross-sectional structural diagram of the stove according to an embodiment of the present invention.

[0021]FIG. 4 is a schematic partial structural diagram one of the stove according to an embodiment of the present invention.

[0022]FIG. 5 is a schematic partial structural diagram two of the stove according to an embodiment of the present invention.

[0023]FIG. 6 is a schematic exploded structural diagram of the stove according to an embodiment of the present invention.

[0024]FIG. 7 is a schematic partial exploded structural diagram of the stove according to an embodiment of the present invention.

[0025]FIG. 8 is a schematic structural diagram of the combustion structure according to an embodiment of the present invention.

[0026]FIG. 9 is a schematic structural diagram of the support structure, air guiding structure, and ash pan according to an embodiment of the present invention.

[0027]Reference signs in the drawings: Combustion structure 1; Inner cavity structure 11; Lower inner cavity part 111; Middle inner cavity part 112; Air Outlet Holes Two 1121; Upper inner cavity part 113; Air Outlet Holes Three 1131; Lower support platform 114; Vent Holes Two 1141; Upper support platform 115; Second support edge 1151; Second limiting edge 1152; Outer cavity structure 12; Support ring 121; Support structure 2; Air inlet channel 20; Support leg 21; Guide channel 22; Air guiding structure 3; Air guide channel 30; Support plate 31; Air Inlet Holes 311; First connecting holes 312; Regulating plate 32; Regulating holes 321; Second connecting holes 322; Operating part 323; Ash pan 4; Mating clearance 40; Pan bottom plate 41; Horizontal guide surface 411; Inclined guide surface 412; Pan side plate 42; Vent Holes One 421; Pan rim structure 43; First support edge 431; First limiting edge 432; Return edge 433; Return guide part 4331; Grate 5; Air Outlet Holes One 51; Ash leakage holes 52; First connection structure 6; Support foot 61; Fire gathering ring 7; Rotation shaft 8; First air guide path group 100; Second air guide path group 200; Third air guide path group 300; First path segment a; Second path segment b; Third path segment c; Fourth path segment d; Fifth path segment e; Sixth path segment f.

DETAILED EMBODIMENTS

[0028]In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0029]In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. These terms are used only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030]In the present invention, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected to", "fixed", and the like should be understood in a broad sense. For example, they may be fixed connections, or detachable connections, or integrated connections; they may be mechanical connections, or electrical connections; they may be directly connected, or indirectly connected through an intermediate medium, or they may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031]In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature can include the first and second features being in direct contact, or it can include the first and second features not being in direct contact but being in contact through other features between them. Furthermore, the first feature being "on", "above", and "over" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than the second feature. The first feature being "under", "below", and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than the second feature.

[0032]Unless otherwise defined, the technical or scientific terms used herein should have the usual meanings understood by those of ordinary skill in the art to which this invention belongs. The words "first", "second", and similar words used in the specification and claims of the present patent application do not denote any order, quantity, or importance, but are merely used to distinguish different component parts. Similarly, words such as "a" or "an" do not denote a quantity limitation, but rather indicate the presence of at least one.

[0033]As shown in FIGS. 1-9, as an embodiment of the present invention, a fully combustion-supporting stove is provided, including a combustion structure 1, a support structure 2, an air guiding structure 3 capable of regulating air volume, an ash pan 4, and a grate 5 located directly above the ash pan 4. The combustion structure 1 has an inner cavity structure 11 and an outer cavity structure 12, as well as a combustion chamber, and the combustion chamber is inwardly defined by the inner cavity structure 11, used for fuel such as firewood and charcoal to burn inside. The support structure 2 is detachably connected to the lower part of the combustion structure 1. The support structure 2 includes support legs 21 for placement on a supporting surface such as the ground or floor, and a gap is provided along the wall of the support structure 2 between adjacent support legs 21. An air inlet channel 20 is formed by the gap, and the air inlet channel 20 is used for external air to flow into the area directly below the air guiding structure 3. The air guiding structure 3 is set directly below the combustion chamber and connected to the support structure 2. The air guiding structure 3 has several air guide channels 30 arranged circumferentially, used for introducing the air directly below the air guiding structure 3 into the combustion structure 1. The ash pan 4 is connected to the upper part of the air guiding structure 3 via a first connection structure 6, and the ash pan 4 has several Vent Holes One 421 along its side wall. The grate 5 is removably placed on the ash pan 4, used to support the fuel. The grate 5 has several Air Outlet Holes One 51, used to introduce air into the combustion chamber, and the grate 5 is also provided with ash leakage holes 52, used to introduce the ash after fuel combustion into the ash pan 4. The Air Outlet Holes One 51 and the ash leakage holes 52 can be set as the same hole, or they can be set as different holes separately. It also includes a first air guide path group 100 for supplying external air into the combustion chamber for combustion support, a second air guide path group 200 whose air outlet is located above the air outlet of the first air guide path group 100, and a third air guide path group 300 whose air outlet is located above the air outlet of the second air guide path group 200. This enables the fuel to mix with the air introduced by the first air guide path group 100 into the combustion chamber for primary combustion. Simultaneously, a large amount of combustible materials such as fuel debris and carbon monoxide produced during the primary combustion rise due to the thrust of the combustion airflow and mix with the air introduced by the second air guide path group 200 into the combustion chamber for secondary combustion. At the same time, a small amount of fuel debris and carbon monoxide and other combustibles missed during the secondary combustion continue to rise due to the thrust of the combustion airflow and mix with the air introduced by the third air guide path group 300 into the combustion chamber for tertiary combustion. This achieves secondary and tertiary combustion support, enabling the fuel to burn more fully and thoroughly, thereby increasing the fuel's burning power and combustion efficiency, and greatly reducing the emission of harmful smoke. Furthermore, the Vent Holes One 421 are arranged on the first air guide path group 100, and the Air Outlet Holes One 51 form the air outlet of the first air guide path group 100, with the grate 5 located directly above the ash pan 4. That is to say, the first air guide path group 100 introduces air into the combustion chamber for combustion support through the Vent Holes One 421 on the side wall of the ash pan 4 and the Air Outlet Holes One 51 on the grate 5. Compared to the structure in the existing technology where air enters the combustion chamber through the horizontal gap between the ash receiving pan and the inner liner and the ash leakage holes, the air in this part of the guide path in the present invention always flows upward, resulting in smaller air flow resistance. This is more conducive to introducing sufficient air into the combustion chamber for combustion support, and since the grate 5 is removably placed on the ash pan 4, the grate 5 can be taken out separately to clean the air outlet of the first air guide path group 100, which is convenient for cleaning. The air outlet of the second air guide path group 200 is arranged around the middle of the combustion chamber, and the air outlet of the third air guide path group 300 is arranged around the upper part of the combustion chamber. This allows the air drawn into the combustion chamber through the air outlet of the second air guide path group 200 and the air outlet of the third air guide path group 300 to generate a swirling effect, thereby improving the mixing effect of air with fuel, fuel debris, and carbon monoxide and other combustibles, enabling the fuel to burn more fully. The air guiding structure 3 is set directly below the combustion chamber, and the air guiding structure 3 has several air guide channels 30 arranged circumferentially. External air can enter the combustion structure through the air inlet channel 20 formed by the gap between adjacent support legs 21 and the air guide channels 30 on the air guiding structure 3 directly below the combustion chamber. Compared to the existing technology where the air inlet is directly set on the side wall of the stove body, the present invention is less susceptible to external environmental factors such as wind direction, making the air drawn into the combustion structure more adequate and uniform, resulting in better combustion support. The air guiding structure 3 can regulate the air volume, which can meet the needs for different fire powers, making the scope of application wider. The support structure 2 is detachably connected to the lower part of the combustion structure 1, the air guiding structure 3 is connected to the support structure 2, and the ash pan 4 is connected to the upper part of the air guiding structure 3 via the first connection structure 6. This allows the ash pan 4, the air guiding structure 3, and the support structure 2 to be detached as a whole relative to the combustion structure 1, which is convenient for emptying the ash from the ash pan 4, making it very convenient to use.

[0034]As shown in FIG. 3, in some specific embodiments, the first air guide path group 100 includes a first path segment a formed by entering from the air inlet channel 20 of the gap and passing through the air guide channels 30 of the air guiding structure 3, and a second path segment b formed by the area enclosed between the inner wall of the outer cavity structure 12 and the outer wall of the ash pan 4, flowing upward from the top of the air guiding structure 3. The first path segment a is used to guide external air from the air inlet channel 20 into the area directly below the air guiding structure 3, and enter the combustion structure 1 through the air guide channels 30. The second path segment b is used to guide the air entering the combustion structure 1 to flow upward along the inner wall of the outer cavity structure 12 and the outer wall of the ash pan 4. The width of the second path segment b gradually decreases from bottom to top for flow guidance, which causes the air power to increase gradually from bottom to top. This creates a relatively large pressure difference with the combustion chamber, which is beneficial for guiding air to be injected into the combustion chamber, leading to better combustion support.

[0035]As shown in FIG. 3, in some specific embodiments, the first air guide path group 100 further includes a third path segment c arranged upward from the Vent Holes One 421 of the ash pan 4 and passing through the Air Outlet Holes One 51 of the grate 5. The Air Outlet Holes One 51 form the air outlet of the first air guide path group 100. The third path segment c is used to guide air to enter the ash pan 4 through the Vent Holes One 421, and enter the combustion chamber through the Air Outlet Holes One 51. The Vent Holes One 421 are arranged near the upper end of the side wall of the ash pan 4. On one hand, this allows the Vent Holes One 421 to introduce air into the ash pan 4 at a position with greater air power, ensuring better combustion support effect. On the other hand, the distance between the Vent Holes One 421 and the bottom of the ash pan 4 is relatively large, and the distance between the Vent Holes One 421 and the Air Outlet Holes One 51 is relatively small. This prevents the ash inside the ash pan 4 from being blown up, while also allowing air to quickly enter the combustion chamber for combustion support through the Air Outlet Holes One 51 after passing through the Vent Holes One 421.

[0036]As shown in FIGS. 3 and 6, in some specific embodiments, the ash pan 4 includes a pan bottom plate 41, a pan side plate 42 extending upward from the circumference of the pan bottom plate 41, and a pan rim structure 43 formed by outwardly flanging the top of the pan side plate 42. The pan rim structure 43 is nested within the inner cavity structure 11, and the grate 5 is removably placed on the pan rim structure 43. This ensures that the fuel placed on the grate 5 remains burning inside the combustion chamber and allows the insulating cavity between the inner cavity structure 11 and the outer cavity structure 12 to provide heat insulation, preventing the operator from being scalded when touching the outer cavity structure 12. The pan rim structure 43 does not contact the inner cavity structure 11, and the outer diameter of the pan rim structure 43 is smaller than the inner diameter of the inner cavity structure 11, so as to form a mating clearance 40 between the pan rim structure 43 and the inner cavity structure 11. The width of the mating clearance 40 is set to 0.5-2mm, which is used to prevent the ash pan 4 from being unable to be nested within the inner cavity structure 11 due to thermal expansion and contraction of the combustion structure 1 or the ash pan 4. The width of the mating clearance 40 is preferably 1.5mm, which can prevent a large amount of air from directly entering the combustion chamber through the mating clearance 40, thereby affecting the air guide efficacy of the first air guide path group 100, the second air guide path group 200, or the third air guide path group 300, while also preventing the ash pan 4 from being unable to be nested within the inner cavity structure 11 due to thermal expansion and contraction.

[0037]As shown in FIGS. 3 and 9, in some specific embodiments, the air guiding structure 3 has a central region arranged directly below the pan bottom plate 41, and a peripheral region arranged surrounding the central region. A portion of the air guide channels 30 is set in the central region of the air guiding structure 3. The pan bottom plate 41 is spaced above the air guiding structure 3. The first connection structure 6 includes several support feet 61 arranged circumferentially between the pan bottom plate 41 and the air guiding structure 3. An interval region connecting the air guide channels 30 of the central region is formed between adjacent support feet 61. The air guide channels 30 located in the central region can introduce the air directly below the central region of the air guiding structure 3 into the combustion structure 1 , and spread laterally outwards from the space between the upper side of the air guiding structure 3 and the outer wall of the pan bottom plate 41, and flow upward along the inner wall of the outer cavity structure 12, the inner wall of the inner cavity structure 11, and the outer wall of the pan side plate 42 to the Vent Holes One 421 or the vent holes two 1141, or return to the Vent Holes One 421 along the outer wall of the pan rim structure 43 and the inner wall of the inner cavity structure 11. The other portion of the air guide channels 30 is set in the peripheral region of the air guiding structure 3. The air guide channels 30 located in the peripheral region can introduce the air directly below the peripheral region of the air guiding structure 3 into the combustion structure 1 , and flow upward along the inner wall of the outer cavity structure 12, the inner wall of the inner cavity structure 11, and the outer wall of the pan side plate 42 to the Vent Holes One 421 or the vent holes two 1141, or return to the Vent Holes One 421 along the outer wall of the pan rim structure 43 and the inner wall of the inner cavity structure 11. In addition, the cold air entering from the outside can exchange heat with the air guiding structure 3, the pan bottom plate 41, the pan side plate 42, the pan rim structure 43, the inner cavity structure 11, and the outer cavity structure 12 as it flows along them. This allows the cold air to gradually convert into hot air which is more favorable for combustion support, and also dissipates heat from these structures, preventing the operator from being scalded.

[0038]As shown in FIG. 3, in some specific embodiments, the Vent Holes One 421 are located on the pan side plate 42 near the pan rim structure 43. The outer end face of the pan bottom plate 41 includes a horizontal guide surface 411 arranged along the horizontal direction, and an inclined guide surface 412 arranged around the periphery of the horizontal guide surface 411. The horizontal guide surface 411 can guide the air, after entering the combustion structure 1 through the air guide channels 30 of the central region, to spread laterally outwards along the horizontal direction. The inclined guide surface 412 is set as a conical structure, and the radius of the upper end of the inclined guide surface 412 is larger than the radius of the lower end. This can guide the air, after spreading laterally outwards in the horizontal direction, to flow obliquely upwards. Simultaneously, compared to the area of the circular region enclosed between the horizontal guide surface 411 and the inner wall of the outer cavity structure 12, the area of the annular region enclosed between the inclined guide surface 412 and the inner wall of the outer cavity structure 12 is reduced. This causes the pressure of the air during the flow process from bottom to top to gradually increase. The pan side plate 42 is set as a conical structure, and the radius of the upper end of the pan side plate 42 is larger than the radius of the lower end. This further guides the pressure of the air during the flow process from bottom to top to continue to gradually increase. The pan rim structure 43 includes a first support edge 431 formed by outwardly flanging the top of the pan side plate 42, a first limiting edge 432 formed by upwardly flanging the outer end of the first support edge 431, and a return edge 433 formed by outwardly flanging the first limiting edge 432. The grate 5 is placed on the upper side of the first support edge 431, and its radial movement relative to the ash pan 4 is limited by the first limiting edge 432. The operator can directly move the grate 5 upward out of the ash pan 4 before dumping the ash inside the ash pan 4. The return edge 433 has a downwardly extending return guide part 4331. An air return region is formed between the pan rim structure 43 and the inner cavity structure 11 and the pan side plate 42. Part of the air, after rising along the outer wall of the pan side plate 42, can press against the first support edge 431, flow laterally outwards along the first support edge 431, flow upward along the first limiting edge 432 and the inner cavity structure 11, and then flow downward along the return edge 433 and its return guide part 4331 into the air return region, to guide the rising air to return to the Vent Holes One 421.

[0039]In some specific embodiments, the inner cavity structure 11 includes a lower inner cavity part 111, a middle inner cavity part 112, an upper inner cavity part 113, a lower support platform 114 formed by outwardly flanging the bottom of the lower inner cavity part 111, and an upper support platform 115 formed by outwardly flanging the top of the upper inner cavity part 113. The lower support platform 114 is spaced above the air guiding structure 3, and the outer end of the lower support platform 114 is combined with the inner wall of the outer cavity structure 12. The outer end of the upper support platform 115 is combined with the outer cavity structure 12, thereby forming an insulating cavity around the inner cavity structure 11 and the outer cavity structure 12, which prevents the heat from the combustion chamber from being transferred to the outer cavity structure 12, thus preventing the operator from being scalded. The combination method can be welding or integral forming. The lower support platform 114 is penetrated by several vent holes two 1141, used to supply air into the insulating cavity. By spacing the lower support platform 114 above the air guiding structure 3, the second path segment b is formed around the bottom surface of the lower support platform 114, the inner wall of the part of the outer cavity structure 12 below the lower support platform 114, the inner wall of the part of the lower inner cavity part 111 below the return guide part 4331, the outer wall of the ash pan 4, and the top surface of the air guiding structure 3. The active area of the entire second path segment b is relatively large. Furthermore, the air guiding structure 3 is set directly below the combustion chamber, and by opening air guide channels 30 in various parts of the air guiding structure 3, more air can be guided from the air guiding structure 3 into the combustion structure 1.

[0040]As shown in FIGS. 1 and 3, in some specific embodiments, the combustion structure 1 is set as a cylindrical structure, which is beneficial for the air drawn into the combustion chamber through the air outlet of the second air guide path group 200 and the air outlet of the third air guide path group 300 to generate a swirling effect. The outer cavity structure 12 includes an outer cavity body and a positioning member connected to the lower end of the outer cavity body. The positioning member is used for mounting and positioning in the installation area, and the inner cavity structure is connected to the outer cavity body. The outer cavity body is set as a conical structure, and the radius of the upper end of the outer cavity structure 12 is smaller than the radius of the lower end. This can gradually increase the pressure of the upward flowing air from bottom to top, making the air power at the air outlet of the second air guide path group 200 greater than the air power at the air outlet of the first air guide path group 100, and the air power at the air outlet of the third air guide path group 300 greater than the air power at the air outlet of the second air guide path group 200. Consequently, the second air guide path group 200 can provide more air for secondary combustion than the first air guide path group 100, and the third air guide path group 300 can provide more air for tertiary combustion than the second air guide path group 200. Furthermore, as the air flows upward, its temperature increases due to the influence of the combustion chamber temperature. This makes the combustion support effect of air introduced into the combustion chamber through the second air guide path group 200 better than that through the first air guide path group 100, and the combustion support effect of air introduced into the combustion chamber through the third air guide path group 300 better than that through the second air guide path group 200.

[0041]In some specific embodiments, the circumferential size of the upper inner cavity part 113 is larger than the circumferential size of the lower inner cavity part 111. That is to say, the radius of the upper inner cavity part 113 is larger than the radius of the lower inner cavity part 111. The lower end of the middle inner cavity part 112 is combined with the lower inner cavity part 111, and the upper end is combined with the upper inner cavity part 113 to form a wedge structure that is smaller at the bottom and larger at the top. The middle inner cavity part 112 is penetrated by several Air Outlet Holes Two 1121, and the Air Outlet Holes Two 1121 form the air outlet of the second air guide path group 200. The upper inner cavity part 113 is penetrated by several Air Outlet Holes Three 1131, and the Air Outlet Holes Three 1131 form the air outlet of the third air guide path group 300. The combination method can be welding or integral forming. The wedge structure design, on one hand, allows the air power to gradually increase as the air flows upward between the inner cavity structure 11 and the outer cavity structure 12. This makes the combustion support effect of air introduced into the combustion chamber through the third air guide path group 300 better than that through the second air guide path group 200. On the other hand, it makes it easier for the air, after rising along the lower inner cavity part 111, to enter the Air Outlet Holes Two 1121 on the middle inner cavity part 112, preventing the air from directly bypassing the Air Outlet Holes Two 1121 and only entering the combustion chamber from the Air Outlet Holes Three 1131, thus ensuring the effective combustion support of the second air guide path group 200. In this embodiment, the middle inner cavity part 112 is set as a conical annular plate structure, and the outer diameter of the middle inner cavity part 112 gradually increases from bottom to top, and the inner diameter of the middle inner cavity part 112 gradually increases from bottom to top. The Air Outlet Holes Two 1121 are arranged along an inclined upward direction, allowing the air to be sprayed into the combustion chamber along an inclined upward direction. This causes the swirling air in the combustion chamber to flow spirally upward, which can further promote the thorough mixing of fuel, fuel debris, and carbon monoxide and other combustibles with the air, making the fuel burn more fully and thoroughly.

[0042]As shown in FIG. 3, in some specific embodiments, the second air guide path group 200 includes the first path segment a, the second path segment b, a fourth path segment d formed by the area enclosed between the inner wall of the outer cavity structure 12 and the outer wall of the lower inner cavity part 111, flowing upward from the vent holes two 1141 of the lower support platform 114, and a fifth path segment e arranged upward and formed by the area enclosed between the inner wall of the outer cavity structure 12 and the outer wall of the middle inner cavity part 112. The fourth path segment d is used to guide air to enter the intermediate cavity formed around the inner cavity structure 11 and the outer cavity structure 12 through the vent holes two 1141, and flow upward along the outer wall of the lower inner cavity part 111 and the inner wall of the outer cavity structure 12. The fifth path segment e is used to guide air to flow upward along the outer wall of the middle inner cavity part 112 and the inner wall of the outer cavity structure 12. Part of the air flowing along the fifth path segment e can enter the combustion chamber through the Air Outlet Holes Two 1121. The width of the fourth path segment d is smaller than the width of the second path segment b, making the air power in the fourth path segment d greater than the air power in the second path segment b. The width of the fifth path segment e gradually decreases from bottom to top for flow guidance, making the air power in the fifth path segment e gradually greater than the air power in the fourth path segment d from bottom to top.

[0043]In some specific embodiments, the third air guide path group 300 includes the first path segment a, the second path segment b, the fourth path segment d, the fifth path segment e, and a sixth path segment f arranged upward and formed by the area enclosed between the inner wall of the outer cavity structure 12 and the outer wall of the upper inner cavity part 113. The sixth path segment f is used to guide air to flow upward along the outer wall of the upper inner cavity part 113 and the inner wall of the outer cavity structure 12. Part of the air flowing along the sixth path segment f can enter the combustion chamber through the Air Outlet Holes Three 1131. The air power in the sixth path segment f is greater than the air power in the fifth path segment e.

[0044]As shown in FIG. 7, in some specific embodiments, a fire gathering ring 7 is also included. The fire gathering ring 7 is used to collect the air introduced into the combustion chamber through the air outlet of the third air guide path group 300 at the fire gathering ring 7, thereby boosting the fire power around the opening of the combustion chamber to burn more vigorously. The upper support platform 115 includes a second support edge 1151 formed by outwardly flanging the top of the upper inner cavity part 113, and a second limiting edge 1152 formed by upwardly flanging the outer end of the second support edge 1151. The fire gathering ring 7 is placed on the upper side of the second support edge 1151, and its radial movement relative to the combustion structure 1 is limited by the second limiting edge 1152. The operator can directly move the fire gathering ring 7 upward out of the combustion structure 1, so as to selectively use or not use the fire gathering ring 7. The Air Outlet Holes Three 1131 are located on the upper inner cavity part 113 near the upper support platform 115. An air return region is formed around the upper support platform 115, the upper inner cavity part 113, and the outer cavity structure 12. Part of the air, after rising along the outer wall of the upper inner cavity part 113, can press against the second support edge 1151 and flow downward under the rebound of the second support edge 1151, so as to guide the rising air to return to the Air Outlet Holes Three 1131.

[0045]As shown in FIG. 9, in some specific embodiments, the air guiding structure 3 is arranged above the air inlet channel 20, ensuring that external air can flow upward through the air inlet channel 20 to the air guide channels 30. The air guiding structure 3 includes a support plate 31 and a regulating plate 32 coaxially arranged beneath the support plate 31. The outer peripheral side of the support plate 31 is combined with the inner side of the wall of the support structure 2. After combination, an installation area is formed around the outer periphery of the top of the support plate 31 and the inner side of the wall of the support structure 2, which is used for removably placing the combustion structure 1. The combination method can be welding or integral forming. The installation area is arranged around the outer periphery of the peripheral region, ensuring that the air guide channels 30 in the peripheral region can enter the combustion structure 1. The combustion structure 1 is placed as a whole on the support plate 31, and its radial movement relative to the support structure 2 is limited by the inner side of the wall of the support structure 2. The operator can directly move the entire combustion structure 1 upward out of the support structure 2 before dumping the ash inside the ash pan 4. The wall or the support legs 21 of the support structure 2 can serve as a gripping structure for the operator to hold when dumping the ash inside the ash pan 4, avoiding direct holding of the ash pan 4 to dump the ash inside the ash pan 4, which could cause scalding. A support ring 121 is formed by inwardly flanging the lower end of the outer cavity structure 12. The combustion structure 1 is supported on the upper side of the support plate 31 by the support ring 121, which provides better stability for the installation of the combustion structure 1.

[0046]In some specific embodiments, the ash pan 4 is connected to the support plate 31 via the first connection structure 6, and the regulating plate 32 is rotatably connected to the support plate 31 via a rotation shaft 8 arranged along the axis of the support plate 31. In this embodiment, the support plate 31 has a first connecting hole 312 opened along its axis, and the regulating plate 32 has a second connecting hole 322 opened along its axis. The support plate 31 and the regulating plate 32 are rotatably connected by a bolt extending into the first connecting hole 312 and the second connecting hole 322 and a nut matingly connected to the bolt. The connecting shaft portion of the bolt forms the rotation shaft 8, which results in a simple structure and convenient assembly and disassembly.