Furnace body device and firewood furnace adopting same
By designing flow paths in the inner and outer cavity structures of the wood-burning stove, secondary or tertiary combustion can be achieved, solving the problems of low combustion efficiency and harmful smoke emissions in wood-burning stoves, and achieving more complete combustion and lower pollution emissions.
Patent Information
- Application Number
- CN202520042745.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-09
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2035-01-09
AI Technical Summary
Existing wood-burning stoves have low combustion efficiency and produce a large amount of harmful smoke, leading to environmental pollution.
Design a furnace body device, including an inner cavity structure and an outer cavity structure, forming a heat-insulating cavity and a flow guide path. External air is introduced into the combustion chamber through the flow guide path for secondary or tertiary combustion to ensure complete combustion of fuel.
Improve fuel combustion efficiency, reduce harmful smoke emissions, and achieve more complete combustion.
Smart Images
Figure CN223691088U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of stove, especially a stove body device and adopt the device's firewood stove. BACKGROUND
[0002] The firewood stove is mainly the fire making appliance of wood, charcoal and other materials as fuel, and some firewood stoves on the market can only realize one combustion, and the combustion efficiency of fuel is very low due to the insufficient oxygen supply or incomplete combustion of fuel and other reasons in the one combustion process, and a large amount of fuel debris and combustible such as carbon monoxide will be directly discharged with flue gas, causing environmental pollution and affecting people's health. SUMMARY
[0003] The utility model discloses a stove body device, including inner chamber structure and outer chamber structure and combustion chamber, the combustion chamber is formed by the inner chamber structure to the inside definition, the outer chamber structure and inner chamber structure between form have the heat insulation cavity and along the heat insulation cavity arrangement be used for the air inlet of outside combustion chamber and carry out the flow path group of combustion supporting, wherein: the inner chamber structure includes lower inner chamber part, middle inner chamber part and upper inner chamber part, the circumference size of upper inner chamber part is greater than the circumference size of lower inner chamber part, the lower end of middle inner chamber part is combined with lower inner chamber part, and the upper end is combined with upper inner chamber part, and the wedge structure of little upper big is formed after, a plurality of air outlet holes two are equipped on middle inner chamber part, the bottom wall or lateral wall of heat insulation cavity is equipped with the ventilation structure for the air inlet in heat insulation cavity, the flow path group includes the fourth section path from the ventilation structure upwards and along the region formed between the inner wall of outer chamber structure and the outer wall of lower inner chamber part, and the fifth section path is arranged upwards and along the region formed between the inner wall of outer chamber structure and the outer wall of middle inner chamber part, the width of fifth section path gradually reduces the flow from lower to upper direction, and part of air flowing along fifth section path can enter the combustion chamber through air outlet hole two.
[0004] Preferably, the middle inner chamber part is provided as a conical ring plate structure, and the outer diameter of the middle inner chamber part gradually increases from lower to upper direction, and the inner diameter of the middle inner chamber part gradually increases from lower to upper direction, and the air outlet holes two are arranged in an inclined upward direction.
[0005] Preferably, a plurality of air outlet holes three are provided on the upper inner chamber part, and the flow path group further includes a sixth section path arranged upwards and along the region formed between the inner wall of the outer chamber structure and the outer wall of the upper inner chamber part, and part of air flowing along the sixth section path can enter the combustion chamber through the air outlet holes three.
[0006] Preferably, the inner cavity structure further comprises a lower support platform formed by outwardly turning up the bottom of the lower inner cavity part, and an upper support platform formed by outwardly turning up the top of the upper inner cavity part, the outer end of the lower support platform is combined with the inner wall of the outer cavity structure, the outer end of the upper support platform is combined with the outer cavity structure, a plurality of ventilation holes are formed in the lower support platform, and the ventilation holes form the ventilation structure.
[0007] Preferably, the lower end of the outer cavity structure is formed with a mounting end face for being mounted on the external bottom support structure, the setting height of the lower support platform is higher than the height of the mounting end face, so as to surround a space area for external air to enter the ventilation holes two between the lower side of the lower support platform and the inner wall of the outer cavity structure.
[0008] Preferably, the air outlet hole three is arranged on the upper inner cavity part close to the upper support platform, and the upper support platform surrounds an air return area with the upper inner cavity part and the outer cavity structure.
[0009] Preferably, the upper support platform comprises a second support rim formed by outwardly turning up the top of the upper inner cavity part, and a second limiting rim formed by upwardly turning up the outer end of the second support rim, the second limiting rim is combined with the outer cavity structure, and the fire gathering ring is movably arranged on the upper side of the second support rim and is limited by the second limiting rim to move radially relative to the inner cavity structure.
[0010] Preferably, the outer cavity structure comprises an outer cavity body and a positioning member connected to the lower end of the outer cavity body, the positioning member is used for being mounted and positioned on the external bottom support structure, the inner cavity structure is connected with the outer cavity body, the outer cavity body is arranged in a tapered structure, and the radius of the upper end of the outer cavity body is smaller than the radius of the lower end.
[0011] The utility model also provides a firewood stove, including bottom support structure, and the above-mentioned stove body device of setting on the bottom support structure.
[0012] Preferably, the bottom support structure comprises a wind guide structure, a support structure for supporting the wind guide structure away from a support interface, an ash tray connected to the upper part of the wind guide structure, and a grate movably arranged on the upper part of the ash tray, the stove body device is arranged in a sleeve structure penetrating up and down and is movably arranged on the upper side of the wind guide structure, after being arranged, the upper part of the ash tray and the grate are located in the combustion chamber, and the outer circumferential side of the ash tray is formed with a removal channel for the stove body device to be lifted upwards from the wind guide structure to remove the bottom support structure.
[0013] The utility model discloses the beneficial effect reached for: through the air outlet two of a plurality of being equipped with being penetrated in middle inner chamber structure, when the negative pressure is formed in the combustion chamber after fuel combustion, can along the ventilation structure of the bottom wall or side wall of heat insulation cavity and penetrate into the heat insulation cavity of outside air, and in turn along the fourth section path, fifth section path, and air outlet two inhale the middle height position near in the combustion chamber, with the combustible material such as a large amount of fuel debris and carbon monoxide that ascend to the middle height position near under the impetus of combustion gas flow, carry out secondary combustion, thereby realize secondary combustion support, make fuel can burn more fully, more completely, thereby can improve the combustion power and combustion efficiency of fuel, and greatly reduce the emission of harmful flue gas, the lower end of middle inner chamber portion combines with lower inner chamber portion, and the upper end combines with upper inner chamber portion, and form the wedge structure of lower small upper big, make air more easily enter the air outlet two on middle inner chamber portion after ascending along lower inner chamber portion, prevent air from directly crossing air outlet two, thereby ensure secondary combustion support efficacy, and the width of fifth section path gradually reduces from lower to upper direction and guides flow, and the air flowing upwards along fifth section path gradually increases from lower to upper, thereby can form the relatively larger pressure difference with the combustion chamber, beneficial to guide air to be injected into the combustion chamber through air outlet two, and the combustion support effect is better.
[0014] Additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS
[0015] The drawings explained here are used to provide further understanding of the utility model, constitute a part of this application, the illustrative embodiment of the utility model and its explanation are used to explain the utility model, and do not constitute improper limitation to the utility model. In the drawings:
[0016] Figure 1 It is the structure diagram of the furnace body device of an embodiment of the utility model Figure 1 .
[0017] Figure 2 It is the structure diagram of the furnace body device of an embodiment of the utility model Figure 2 .
[0018] Figure 3 It is the sectional structure diagram of the furnace body device of an embodiment of the utility model.
[0019] Figure 4 It is the sectional structure diagram of the firewood stove of an embodiment of the utility model. DETAILED DESCRIPTION
[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the described embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without any creative effort fall within the scope of the present application.
[0021] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.
[0022] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0023] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include the first and second features in direct contact, or can include the first and second features not in direct contact, but in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes the first feature directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.
[0024] Unless otherwise defined, the technical terms or scientific terms used herein should be understood as the usual meaning understood by those skilled in the art to which the present application belongs. The use of "first", "second" and similar words in the present application patent application description and claims does not indicate any order, quantity or importance, but is only used to distinguish different components. Similarly, "one" or "a" and similar words do not indicate a quantity limit, but indicate the existence of at least one.
[0025] As Figures 1-3 shown, as an embodiment of the utility model provides a furnace body device, including inner chamber structure 11 and outer chamber structure 12 and combustion chamber, combustion chamber is formed by inner chamber structure 11 inwardly defined, outer chamber structure 12 and inner chamber structure 11 between form have heat insulation cavity, and along the heat insulation cavity arrangement is used for the air inlet of outside combustion chamber for combustion guide path group. Inner chamber structure 11 includes lower inner chamber portion 111, middle inner chamber portion 112 and upper inner chamber portion 113, the circumference size of upper inner chamber portion 113 is greater than the circumference size of lower inner chamber portion 111, the lower end of middle inner chamber portion 112 is combined with lower inner chamber portion 111, and the upper end is combined with upper inner chamber portion 113 to form the wedge structure of lower small upper big, a plurality of air outlet holes two 1121 are provided on middle inner chamber portion 112. The bottom wall or side wall of heat insulation cavity is provided with ventilation structure for air into heat insulation cavity, guide path group includes fourth segment path d formed from ventilation structure upwards and along the region enclosed between the inner wall of outer chamber structure 12 and the outer wall of lower inner chamber portion 111, and fifth segment path e arranged upwards and formed along the region enclosed between the inner wall of outer chamber structure 12 and the outer wall of middle inner chamber portion 112, the width of fifth segment path e gradually decreases from lower to upwards direction, and part of air flowing along fifth segment path e can enter combustion chamber through air outlet hole two 1121. In the embodiment, by a plurality of air outlet holes two 1121 being provided on middle inner chamber structure 112, when negative pressure is formed in combustion chamber after fuel combustion, external air can be sucked into heat insulation cavity along the ventilation structure penetrating the bottom wall or side wall of heat insulation cavity, and sequentially sucked into the middle height position near combustion chamber along fourth segment path d, fifth segment path e and air outlet hole two 1121, mixed with some combustible materials such as a large amount of fuel debris and carbon monoxide generated in the first combustion process, which rise to the middle height position under the push of combustion gas flow, to carry out secondary combustion, thereby realizing secondary combustion support, so that fuel can be burned more fully and more completely, thereby improving the combustion power and combustion efficiency of fuel, and greatly reducing the emission of harmful flue gas. The lower end of middle inner chamber portion 112 is combined with lower inner chamber portion 111, and the upper end is combined with upper inner chamber portion 113 to form the wedge structure of lower small upper big, so that air is more easily entered into air outlet hole two 1121 on middle inner chamber portion 112 after rising along lower inner chamber portion 111, preventing air from directly passing over air outlet hole two 1121, thereby ensuring the effectiveness of secondary combustion support, and the width of fifth segment path e gradually decreases from lower to upwards direction, so that air flowing upwards along fifth segment path e gradually increases from lower to upwards, thereby being able to form a relatively large pressure difference with combustion chamber, which is conducive to guiding air to be injected into combustion chamber through air outlet hole two 1121, and the combustion support effect is better.
[0026] As Figure 3As shown, in some specific embodiments, the middle inner cavity portion 112 is arranged in a conical ring plate structure, and the outer diameter of the middle inner cavity portion 112 gradually increases from bottom to top, the inner diameter of the middle inner cavity portion 112 gradually increases from bottom to top, and the air outlet holes two 1121 are arranged in an upwardly inclined direction, so that air can be sprayed into the combustion chamber in an upwardly inclined direction, so that the air entering the combustion chamber through the air outlet holes two 1121 flows upward in a spiral direction, which can further promote the mixing of fuel, fuel debris, carbon monoxide and other combustible materials with air, so that the fuel burns more fully and completely.
[0027] In some specific embodiments, the upper inner cavity portion 113 is provided with a plurality of air outlet holes three 1131, and the flow path group further includes a sixth segment path f formed in the region surrounded by the outer wall of the outer cavity structure 12 and the outer wall of the upper inner cavity portion 113 and communicated with the air outlet holes three 1131, and part of the air flowing along the sixth segment path f can enter the combustion chamber through the air outlet holes three 1131. When a negative pressure is formed in the combustion chamber after the fuel burns, external air can also be sequentially sucked into the combustion chamber near the high altitude position through the fourth segment path d, the fifth segment path e, the sixth segment path f and the air outlet holes three 1131, mixed with some combustible materials such as fuel debris and carbon monoxide that are missed in the secondary combustion process and rise to the high altitude position under the push of the combustion gas flow, and undergo tertiary combustion, thereby achieving tertiary combustion support, so that the fuel can burn more fully and completely, thereby further improving the combustion firepower and combustion efficiency of the fuel and reducing the emission of harmful flue gas. The air flowing in the sixth segment path f absorbs more heat in the heat insulation cavity than the air flowing in the fifth segment path e, so the air flowing in the sixth segment path f has better combustion support effect, and since the circumferential size of the upper inner cavity portion 113 is greater than that of the lower inner cavity portion 111, and the air outlet holes two 1121 are arranged on the middle inner cavity portion 112 and the air outlet holes three 1131 are arranged on the upper inner cavity portion 113, the wind force entering the combustion chamber through the sixth segment path f and the air outlet holes three 1131 is greater than the wind force entering the combustion chamber through the fifth segment path e and the air outlet holes two 1121, which is more conducive to sending the air with better combustion support effect in the sixth segment path f into the central combustion area of the fuel for combustion support.
[0028] As Figure 2 , 3As shown, in some embodiments, the inner cavity structure 11 further comprises a lower support platform 114 formed by outwardly turning over the bottom of the lower inner cavity portion 111, and an upper support platform 115 formed by outwardly turning over the top of the upper inner cavity portion 113, the outer end of the lower support platform 114 is combined with the inner wall of the outer cavity structure 12, and the outer end of the upper support platform 115 is combined with the outer cavity structure 12, thereby forming a heat insulation cavity around between the inner cavity structure 11 and the outer cavity structure 12, avoiding the heat of the combustion chamber from being transmitted to the outer cavity structure 12 to scald the operator. The combination can be welding or one-piece forming, so that the inner cavity structure 11 and the outer cavity structure 12 form an integral structure, which is convenient to move. A plurality of ventilation holes two 1141 are provided through the lower support platform 114, and the ventilation holes two 1141 form the ventilation structure for the air to enter the heat insulation cavity from the bottom wall of the heat insulation cavity, which is more matched with the upward flowing direction of the air, and facilitates the air to pass through the ventilation holes two 1141 into the heat insulation cavity, and the lower support platform 114 is supported and connected between the lower inner cavity portion 111 and the outer cavity structure 12, thereby improving the stability of the connection between the inner cavity structure 11 and the outer cavity structure 12. Of course, in other embodiments, the lower support platform 114 can not be provided, and the ventilation structure is formed directly by the spacing space between the lower inner cavity portion 111 and the outer cavity structure 12, or the ventilation structure is provided on the lower inner cavity portion 111 or the outer cavity structure 12, which can also guide the external air into the heat insulation cavity through the ventilation structure.
[0029] As shown, Figure 2 in some embodiments, the lower end of the outer cavity structure 12 forms a mounting end face 1211 for mounting on the external bottom support structure, and the setting height of the lower support platform 114 is higher than the height of the mounting end face 1121, so as to form a space region for the external air to enter the ventilation holes two 1141 around between the lower side of the lower support platform 114 and the inner wall of the outer cavity structure 12, so that the upward flowing air is more easily passed through the ventilation holes two 1141 under the blocking of the outer cavity structure 12.
[0030] In some embodiments, the air outlet hole three 1131 is provided on the upper inner cavity portion 113 close to the upper support platform 115, and the upper support platform 115 is combined with the upper inner cavity portion 113 and the outer cavity structure 12 to form an air return region, and part of the air can flow downward under the rebound of the second support edge 1151 after pressing the second support edge 1151 after rising along the outer wall of the upper inner cavity portion 113, so as to guide the rising air to flow back to the air outlet hole three 1131.
[0031] In some embodiments, a fire gathering ring 7 is further included for gathering air introduced into the combustion chamber through the third air outlet 1131 at the fire gathering ring 7 to help the fire burning around the opening position of the combustion chamber to burn more fiercely. The upper support table 115 includes a second support rim 1151 formed by turning up the top of the upper inner cavity portion 113 outward, and a second limiting rim 1152 formed by turning up the outer end of the second support rim 1151 upward, the second limiting rim 1152 is combined with the outer cavity structure 12, the fire gathering ring 7 is movably placed on the upper side of the second support rim 1151 and is limited by the second limiting rim 1152 from moving radially relative to the inner cavity structure 11, and the operator can directly move the fire gathering ring 7 upward out of the inner cavity structure 12 to selectively use or not use the fire gathering ring 7.
[0032] As shown in Figure 2 some embodiments, the outer cavity structure 12 includes an outer cavity body 120 and a positioning member connected to the lower end of the outer cavity body 120 for being mounted and positioned on the outer bottom support structure, the inner cavity structure 11 is connected with the outer cavity body 120, the outer cavity body 120 is provided in a tapered structure with a smaller radius at the upper end than at the lower end to gradually increase the pressure of air flowing upward from bottom to top, so that the wind force entering the combustion chamber through the third air outlet 1131 is greater than the wind force entering the combustion chamber through the second air outlet 1121, thereby being able to provide more air for the third combustion through the third air outlet 1131 than for the second combustion through the second air outlet 1121, and since the temperature of the air is also increasing during the upward flow due to the influence of the temperature in the combustion chamber, the combustion supporting effect of the air introduced into the combustion chamber through the third air outlet 1131 is better than that of the air introduced into the combustion chamber through the second air outlet 1121.
[0033] As shown in Figure 4 another embodiment of the present application, a firewood stove is further provided, which comprises a bottom support structure and the above-mentioned stove body device arranged on the bottom support structure. The firewood stove of the present embodiment can realize secondary combustion supporting due to the adoption of the stove body device of the present application, so that the fuel can be burned more fully and completely, thereby improving the combustion power and efficiency of the fuel and greatly reducing the emission of harmful smoke.
[0034] In some embodiments, the base structure comprises the air guide structure 3, the support structure 2 for supporting the air guide structure 3 away from the support interface such as the ground, the gravel surface, the grass surface, the floor surface, etc., the ash tray 4 connected to the upper part of the air guide structure 3, and the movable grate 5 placed on the upper part of the ash tray 4, and the ash tray 5 is also provided with an ash hole 52 for guiding the ash after the fuel is burned into the ash tray 4. The furnace body device is arranged as a sleeve structure penetrating from top to bottom and is movably placed on the upper side of the air guide structure 3. After being placed, the upper part of the ash tray 4 and the grate 5 are located in the combustion chamber, and the outer peripheral side of the ash tray 4 is formed with a removal passage for lifting the furnace body device upward from the air guide structure 3 to remove the base structure. The furnace body device can be lifted upward and removed from the base structure, so that the ash tray 4 in the combustion chamber is directly exposed to the outside, and because the ash tray 4 is connected to the upper part of the air guide structure 3, the ash tray 4, the air guide structure 3 and the support structure 2 can be removed as a whole relative to the furnace body device. The operator can pour the ash by holding the air guide structure 3, the support structure 2 and other structures other than the ash tray 4, which is simple to operate and convenient to use. Moreover, the operator can avoid direct contact with the side wall of the combustion chamber or the ash tray 4 during use, thereby preventing being scalded or having hands or clothes stained with ash. After the furnace body device is removed, it is more convenient to clean the ash on the air guide structure 3 below the ash tray 4. The utility model has very strong practicality.
[0035] In some embodiments, the air guide structure 3 is arranged directly below the combustion chamber in the transverse direction, and the air guide structure 3 is provided with a plurality of air guide passages 30 in the circumferential direction for guiding the air directly below the air guide structure 3 into the furnace body device. The support structure 2 has a plurality of support legs 21 arranged around the outer periphery of the air guide structure 3. The air guide path group further comprises a first segment path a formed from the air inlet channel 20 into the air guide passage 30, and a second segment path b formed from the top of the air guide structure 3 upward along the region surrounded by the inner wall of the outer cavity structure 12 and the outer wall of the ash tray 4. The first segment path a is used to guide the external air from the air inlet channel 20 into the air guide structure 3 directly below, and into the furnace body device through the air guide passage 30. The second segment path b is used to guide the air entering the furnace body device to flow upward along the inner wall of the outer cavity structure 12 and the outer wall of the ash tray 4. The width of the second segment path b gradually decreases from bottom to top, which guides the airflow to gradually increase from bottom to top, so that a relatively large pressure difference can be formed with the combustion chamber, which is beneficial to guide the air to be injected into the combustion chamber, and the combustion supporting effect is better. Compared with the prior art in which the air inlet is directly arranged on the side wall of the furnace body, the air guide passage 30 of the utility model is arranged directly below the furnace body device, which is less affected by external environmental factors such as wind direction, so that the air sucked into the combustion chamber is more sufficient and uniform, and the combustion supporting effect is better.
[0036] In some specific embodiments, the positioning member comprises a positioning ring plate 122 extending downward from the lower end of the outer cavity body 120, and a support ring 121 formed by inwardly flanging the lower end of the positioning ring plate 122, the support structure 2 has a limiting member 23 arranged in the circumferential direction, and the air guide structure 3 and the limiting member 23 surround to form a mounting area for placing the furnace body device, the bottom surface of the support ring 121 forms the mounting end surface 1211, after being placed, the positioning ring plate 122 and the limiting member 23 are sleeved with each other to limit the transverse movement of the furnace body device as a whole, and the mounting end surface 1211 is placed and supported on the upper surface of the air guide structure 3, so that the furnace body device is stably placed on the bottom support structure through the cooperation of the positioning member, the limiting member 23 and the air guide structure 3.
[0037] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.
[0038] In summary, the above only describes the preferred embodiments of the present application, and any changes and modifications made within the scope of the patent application of the present application shall be included in the scope of the patent of the present application.
Claims
1. A furnace arrangement, characterized in that The application relates to a combustion chamber, which comprises an inner cavity structure, an outer cavity structure and a combustion chamber formed by the inner cavity structure, a heat insulation cavity formed between the inner cavity structure and the outer cavity structure, and a guide path group for external air entering the combustion chamber for combustion arranged along the heat insulation cavity. The inner cavity structure comprises a lower inner cavity part, a middle inner cavity part and an upper inner cavity part, the circumferential size of the upper inner cavity part is larger than that of the lower inner cavity part, the lower end of the middle inner cavity part is combined with the lower inner cavity part, the upper end is combined with the upper inner cavity part, and a wedge structure with a small lower part and a large upper part is formed, and a plurality of air outlet holes two are arranged on the middle inner cavity part. A ventilation structure for air entering the heat insulation cavity is arranged on the bottom wall or the side wall of the heat insulation cavity, the guide path group comprises a fourth path formed along the region between the inner wall of the outer cavity structure and the outer wall of the lower inner cavity part upwards from the ventilation structure, and a fifth path formed along the region between the inner wall of the outer cavity structure and the outer wall of the middle inner cavity part upwards, the width of the fifth path gradually decreases from the lower part to the upper part, and part of the air flowing along the fifth path can enter the combustion chamber through the air outlet holes two.
2. The furnace arrangement of claim 1, characterized in that: The middle inner cavity part is arranged in a conical ring plate structure, the outer diameter of the middle inner cavity part gradually increases from the lower part to the upper part, the inner diameter of the middle inner cavity part gradually increases from the lower part to the upper part, and the air outlet holes two are arranged in an inclined upward direction.
3. The furnace arrangement of claim 2, wherein: A plurality of air outlet holes three are arranged on the upper inner cavity part, the guide path group further comprises a sixth path arranged upwards along the region between the inner wall of the outer cavity structure and the outer wall of the upper inner cavity part, and part of the air flowing along the sixth path can enter the combustion chamber through the air outlet holes three.
4. The furnace arrangement of claim 3, wherein: The inner cavity structure further comprises a lower support table formed by outwardly turning up the bottom of the lower inner cavity part, and an upper support table formed by outwardly turning up the top of the upper inner cavity part, the outer end of the lower support table is combined with the inner wall of the outer cavity structure, the outer end of the upper support table is combined with the outer cavity structure, a plurality of ventilation holes two are arranged on the lower support table, and the ventilation holes two form the ventilation structure.
5. The furnace arrangement of claim 4, wherein: The lower end of the outer cavity structure is provided with a mounting end face for being mounted on an external bottom support structure, the setting height of the lower support table is higher than the height of the mounting end face, so that a space region for external air entering the ventilation holes two is formed between the lower side of the lower support table and the inner wall of the outer cavity structure.
6. The furnace arrangement of claim 4, wherein: The air outlet holes three are arranged on the upper inner cavity part close to the position of the upper support table, and the upper support table and the upper inner cavity part and the outer cavity structure form an air backflow region.
7. The furnace arrangement of claim 6, characterized in that: The application further comprises a fire gathering ring, the upper support table comprises a second support edge formed by outwardly turning up the top of the upper inner cavity part, and a second limiting edge formed by upwardly turning up the outer end of the second support edge, the second limiting edge is combined with the outer cavity structure, the fire gathering ring is movably arranged on the upper side of the second support edge and is limited by the second limiting edge to move radially relative to the inner cavity structure.
8. The furnace arrangement according to any of claims 1 - 7, characterized in that The outer cavity structure comprises 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 on an external base structure, the inner cavity structure is connected to the outer cavity body, the outer cavity body is provided in a tapered structure, and the radius of the upper end of the outer cavity body is smaller than the radius of the lower end.
9. A fire pit, characterized by: The base structure comprises a base structure, and the stove device as claimed in any one of claims 1-8 is arranged on the base structure.
10. The fire-pit of claim 9, wherein: The base structure comprises a wind guide structure, a support structure for supporting the wind guide structure away from a support interface, an ash tray connected to the upper part of the wind guide structure, and a movable grate placed on the upper part of the ash tray, the stove device is arranged in a sleeve structure penetrating from top to bottom, and is movably placed on the upper side of the wind guide structure, after being placed, the upper part of the ash tray and the grate are located in the combustion chamber, and the outer circumferential side of the ash tray is formed with a removal channel for lifting the stove device upward from the wind guide structure to remove the stove device from the base structure.