High heat energy utilization rate firewood stove

Abstract

The application discloses a high-heat-energy-utilization-rate firewood stove, which comprises an outer cover, a top frame arranged on the outer cover, an outer shell arranged in the outer cover, and an inner shell arranged in the outer shell. Compared with the prior art, the application has the advantages that the local open fire can extend along the inner wall, the heat energy is fully released in the annular open wall, the open fire is in full contact with the bottom of the kettle or pot, and the utilization rate of the heat energy is improved, the structure of the outer cover reduces the temperature transferred to the outer shell annular vertical wall three, and the scalding probability of the human body when contacting the outer cover annular vertical wall three is reduced, the top frame upper side opening and the horizontal outward turning side edge at the side opening are arranged, the placement and pushing of the burning object are more convenient, the burning object can naturally fall and continue to burn under the action of the outer shell annular transition edge and the inner shell annular abutting edge, and the subsequent clamping operation is not needed, and the use operation is more convenient.

Description

Technical Field

[0001] This invention relates to the field of wood-fired stove technology, and to wood-fired stoves with high thermal energy utilization. Background Technology

[0002] An outdoor wood stove is a tool used to start a fire for energy when camping or playing outdoors. It is popular among outdoor enthusiasts because of its small size, portability, low risk of fire, and low risk of causing a fire.

[0003] To meet the oxygen requirements of firewood combustion and accelerate the release of heat energy during combustion, some outdoor wood-burning stoves usually have a fan installed at the bottom. When the firewood is lit, the fan is powered by a power source such as a power bank. The fan delivers air into the inner chamber where the firewood is placed, providing sufficient oxygen for combustion, accelerating the combustion and heat release. The fire intensity is controlled by the fan's rotation efficiency.

[0004] For example, the patent with authorization announcement number CN206369232U provides an outdoor wood-burning stove, in which the outer shell, each wind baffle, and the inner cavity for placing and burning the combustible are set with straight cylindrical walls, and a conical inner cavity is set above the inner cavity. The arrangement of the inner cavity and the conical inner cavity allows the heat energy generated by the combustion of the combustible in the inner cavity to be collected and discharged from the central hole of the conical inner cavity. The heat energy is transferred to the main body top cover through the open flame. A kettle or pot or other utensils are placed on the stove rack of the main body top cover to contact and conduct the heat energy carried out by the open flame.

[0005] However, this patent has the following problems:

[0006] 1. Due to the structural limitations of the conical inner cavity and the main body top cover, the open flame released from the inner cavity and the conical inner cavity is concentrated and cannot extend along the inner wall of the main body top cover and the wind baffles around the main body top cover. Although the flame will extend along the bottom of the kettle or pot due to the wind force of the fan, the contact area between the open flame in the main body top cover and the wind baffles and the bottom of the kettle or pot is limited. The heating effect of the open flame on the center of the kettle or pot is still strong. The heat that can be conducted in the concentrated heating part of the kettle or pot is limited, resulting in some unconducted heat being lost in an instant, which reduces the heat energy utilization rate.

[0007] Second, the straight cylindrical wall structure of the outer shell results in a constant distance between the outer shell and the middle layer, which makes the heat energy transferred from the main body top cover and each wind baffle to the outer shell faster. The heat energy dissipates at a relatively stable rate as it is transferred downward along the outer shell. Because the area of ​​the outer shell in contact with the air is limited, the heat energy dissipates at a limited rate on the outer shell. The residual heat energy on the outer shell is at a high temperature, which can easily cause burns when the user touches the outer shell.

[0008] Third, a groove for adding firewood to the inner cavity is opened at the connection between the second and third wind deflectors. When adding firewood, it is necessary to place the firewood from the groove. However, the groove is not designed to allow the firewood to be flat and pushed horizontally into each wind deflector. The clamping and conveying of firewood is also quite laborious and inconvenient. In addition, the firewood needs to be pushed into the heat outlet of the conical inner cavity. When the firewood leaves the groove, it is very easy for it to remain on the top cover of the main body. This not only affects the combustion of the firewood, but also requires effort to send the firewood on the top cover of the main body into the conical inner cavity and the inner cavity. It is quite inconvenient to use. Summary of the Invention

[0009] This invention addresses the problems of low thermal energy utilization during combustion, high outer shell temperature, and inconvenience in feeding firewood into existing wood-burning stoves. The technical problem to be solved by this invention is to provide a wood-burning stove with high thermal energy utilization that can improve the thermal energy utilization during combustion, reduce the outer shell temperature, and facilitate the feeding of firewood into the stove.

[0010] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a wood-fired stove with high thermal energy utilization rate, including a top frame, an outer cover, an outer liner, an inner liner, and a fan;

[0011] The top frame is fitted over the outer cover, and the outer cover has several heat dissipation holes on its side wall, and at least three rotatable outward-folding support feet are installed on the inner wall of the lower end of the outer cover.

[0012] The outer liner is fixed to the inner wall of the outer cover, and the inner liner is fixed to the inner wall of the outer liner, forming a wind cavity between the inner wall of the outer liner and the outer wall of the inner liner;

[0013] The fan is located below the inner liner and is fixedly connected to the outer liner. The fan can supply air to the air cavity.

[0014] The top frame is provided with an annular vertical wall and an annular open wall at the upper end of the annular vertical wall. A side opening is provided on the annular open wall, and a horizontally outward-curved side is provided at the side opening. The upper end of the outer cover is flush with the upper end surface of the side.

[0015] The outer cover is provided with an annular vertical wall II, an annular inclined wall and an annular vertical wall III in sequence from top to bottom. A number of heat dissipation holes are opened on the annular vertical wall III. The inner and outer diameters of the annular vertical wall III are larger than the inner and outer diameters of the annular vertical wall II. The top frame is fitted outside the annular vertical wall II through the annular vertical wall. The annular inclined wall restricts the pre-installation position of the top frame on the outer cover.

[0016] The outer liner has an annular transition edge that is larger at the top and smaller at the bottom, and a surrounding wall located at the lower end of the annular transition edge. The upper end of the annular transition edge is flush with and fixed to the upper end of the outer cover. The fan is fixed inside the surrounding wall and is offset from the annular transition edge.

[0017] The inner liner is provided with an annular stop edge that is larger at the top and smaller at the bottom, and a barrel wall located at the lower end of the annular stop edge. The inner liner is pre-installed and fixed to the inner wall of the annular transition edge by the annular stop edge. The lower end of the barrel wall is closed, and the closed end inside the barrel wall is provided with a locally spherical arched piece that is higher in the center and lower at the periphery. Several air holes are provided on the side wall of the barrel wall and the arched piece.

[0018] A further preferred embodiment of the present invention is as follows: an installation plate is fixed inside the enclosure, the installation plate is located below the inner liner, an air inlet is provided at the center of the installation plate, and the fan is fixed below the center of the installation plate.

[0019] A further preferred embodiment of the present invention is as follows: an overhead plate is provided above the mounting plate, and at least three downwardly extending legs are provided below the overhead plate and fixed to the mounting plate, with the at least three legs distributed around the outer ring of the air inlet.

[0020] A further preferred embodiment of the present invention is: a fireproof and heat-insulating plate is fixed to the upper surface of the overhead plate, and the periphery of the overhead plate is provided with at least three upwardly extending and bendable flaps, the flaps limiting the installation of the fireproof and heat-insulating plate.

[0021] A further preferred embodiment of the present invention is that the size of the fireproof and heat-insulating board is smaller than the size of the inner wall of the outer liner, and the size of the fireproof and heat-insulating board is larger than the size of the air inlet.

[0022] A further preferred embodiment of the present invention is: the annular open wall has a funnel-shaped outward expansion structure, and a bracket is fixed on the inner wall of the annular open wall, and the support frame is hinged on the bracket, and the support frame can be flipped outward to the upper end of the annular open wall.

[0023] A further preferred embodiment of the present invention is as follows: the bracket is provided with a fitting part that fits against the inner wall of the annular open wall, and a mounting part that deviates from the inner wall of the annular open wall, the support is hinged to the mounting part, and the upper end of the annular open wall is provided with a 7-shaped outward flange, the fitting part and the outward flange restricting the rotation angle of the support.

[0024] A further preferred embodiment of the present invention is: the supporting leg is composed of a hinged frame leg and a fixing member, the fixing member is fixed on the inner wall of the annular vertical wall three, the frame leg can rotate outward, and at least three frame legs support the outer cover.

[0025] A further preferred embodiment of the present invention is as follows: the air holes are arranged in three groups on the barrel wall, wherein the two groups of air holes located at the bottom and middle positions are each a single hole distributed in a ring, and the group of air holes located at the top consists of at least three obliquely distributed air holes as a unit, and the unit is distributed in a ring array.

[0026] A further preferred embodiment of the present invention is that the diameter and number of individual holes in the bottommost group of air holes are greater than the diameter and number of individual holes in the group of air holes in the middle position.

[0027] Compared with the prior art, the advantages of the present invention are as follows:

[0028] 1. By progressively expanding the ring-shaped stop edge on the inner liner, the ring-shaped transition edge on the outer liner, and the ring-shaped open wall on the top frame, the local open flames generated during combustion can extend along the inner walls under the action of the wind force at the air holes in the inner liner. The heat energy carried by the open flames is fully released within the range of the ring-shaped open wall on the top frame. The open flames released inside the top frame make full contact with the bottom of the kettle or pot, thus improving the utilization rate of heat energy.

[0029] 2. The outer cover is designed with three annular vertical walls (two, three, and three) from top to bottom, and the inner and outer diameters of the three annular vertical walls are larger than those of the two annular vertical walls. This design allows the outer cover to transfer heat through the two annular vertical walls to the top frame. With the heat dissipation from the two annular vertical walls and the outward diffusion of heat from the inclined walls, the contact area between the outer cover and the air is increased within the limit of the total height of the outer cover. This improves the heat dissipation efficiency on the outer shell and effectively reduces the temperature transferred to the three annular vertical walls of the outer shell. This reduces the probability of burns when the human body comes into contact with the three annular vertical walls of the outer cover.

[0030] 3. The side openings on the annular open wall of the top frame and the horizontal outward-curving side edges at the side openings allow the combustible material to be placed on the side outside the top frame. This provides a support surface for placement and pushing the combustible material in before it is fully inside the top frame, reducing the pneumatic force required for clamping and conveying the material. This facilitates the placement and pushing of the material. When the material detaches from the side edge, it naturally falls into the combustion chamber and continues to burn under the action of the annular transition edge of the outer liner and the annular stop edge of the inner liner, eliminating the need for subsequent clamping operations and making it convenient to use. Attached Figure Description

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be regarded as a limitation on the scope of the present invention. In addition, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0032] Figure 1 This is a schematic diagram of the structure of a wood-burning stove according to a preferred embodiment of the present invention;

[0033] Figure 2 This is a cross-sectional view of a wood-burning stove according to a preferred embodiment of the present invention;

[0034] Figure 3 This is a preferred embodiment of the present invention. Figure 2 Enlarged schematic diagram of part A in the middle.

[0035] In the diagram: 1. Top frame, 1-1. Annular vertical wall one, 1-2. Annular open wall, 1-3. Side opening, 1-4. Side edge, 1-5. Outer flange; 2. Outer cover, 2-1. Annular vertical wall two, 2-2. Annular inclined wall, 2-3. Annular vertical wall three, 2-4. Heat dissipation hole; 3. Outer liner, 3-1. Annular transition edge, 3-2. Enclosure wall; 4. Inner liner, 4-1. Annular stop edge, 4-2. Barrel wall, 4-3. Upper air vent group, 4-4. Middle air vent group, 4-5. Lower air vent group; 5. Fan; 6. Arch plate; 7. Mounting plate, 7-1. Air inlet; 8. Elevated plate, 8-1. Support leg, 8-2. Folding plate; 9. Fireproof and heat-insulating board; 10. Frame foot; 11. Fastener; 12. Bracket, 12-1. Fitting part, 12-2. Mounting part; 13. Support frame. Detailed Implementation

[0036] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0037] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it may not be further defined and explained in subsequent figures.

[0038] This embodiment mainly describes a wood-burning stove with high thermal energy utilization rate that can improve the thermal energy utilization rate of the combustible material, reduce the temperature of the outer casing, and facilitate the feeding of the combustible material into the combustion chamber. The details are as follows:

[0039] like Figure 1-3 As shown, a wood-fired stove with high thermal energy utilization includes a top frame 1 for placing utensils such as kettles or pots, an outer cover 2 located below the top frame 1, an outer liner 3 located inside the outer cover 2, an inner liner 4 located in the outer liner 3, and a fan 5 located below the inner liner 4 and fixedly connected to the outer liner 3. An air cavity is formed between the inner wall of the outer liner 3 and the outer wall of the inner liner 4. The fan 5 can supply air to the air cavity. Preferably, the lower end of the outer liner 3 is open, and the lower end of the inner liner 4 is sealed.

[0040] The inner liner 4 has several air holes on its side wall. When the blower 5 supplies air to the air chamber, the air in the air chamber enters the inner liner 4 through the air holes. When there is a combustible material burning in the inner liner 4, the air sent into the inner liner 4 through the air holes provides oxygen for the combustion of the combustible material and accelerates the combustion of the combustible material.

[0041] In this embodiment, the air vents are divided into three groups, from top to bottom: upper air vent group 4-3, middle air vent group 4-4, and lower air vent group 4-5. The middle air vent group 4-4 and the lower air vent group 4-5 are both circularly distributed with a single vent. The size and number of vents in the lower air vent group 4-5 are larger than the size and number of vents in the middle air vent group 4-4. The upper air vent group 4-3 is arranged in a circular array with at least three vents per unit.

[0042] The lower air vent group 4-5 is located near the lower end of the inner liner 4, and the upper air vent group 4-3 is located near the upper end of the inner liner 4. When there is burning material in the inner liner 4, the lower air vent group 4-5 provides oxygen for the combustion of the material and accelerates the combustion. As the burning material will float to the top due to the movement of the open flame, the middle air vent group 4-4 provides sufficient oxygen to the floating material to ensure that it can burn completely. The lower air vent group 4-5 causes the open flame passing through it to rotate slightly under the action of the wind. Preferably, the bottom of the inner liner 4 is provided with an arch plate 6. The arch plate 6 has a locally spherical plate structure with a high center and low periphery. The arch plate 6 is also provided with several air vents. The arrangement of several air vents on the arch plate 6 can effectively prevent the burning material piled up in the arch plate 6 and the side wall of the inner liner 4 from being extinguished due to lack of oxygen.

[0043] In this embodiment, the inner liner 4 is provided with an annular stop edge 4-1 that is larger at the top and smaller at the bottom, and a barrel wall 4-2 located at the lower end of the annular stop edge 4-1. The upper air hole group 4-3, the middle air hole group 4-4, and the lower air hole group 4-5 are all provided on the barrel wall 4-2. The outer liner 3 is provided with an annular transition edge 3-1 that is larger at the top and smaller at the bottom, and a surrounding wall 3-2 located at the lower end of the annular transition edge 3-1. The inner liner 4 is pre-installed on the inner wall of the annular transition edge 3-1 by the annular stop edge 4-1 and can be welded and fixed. Preferably, both the annular stop edge 4-1 and the annular transition edge 3-1 are larger at the top and smaller at the bottom, which facilitates the application of an open flame extending from the barrel wall 4-2 and slightly rotating locally to the annular stop edge 4-1 and the annular transition edge 3-1.

[0044] The outer cover 2 is provided with annular vertical wall 2-1, annular inclined wall 2-2 and annular vertical wall 3-3 from top to bottom. The upper end of the annular transition edge 3-1 is slightly higher than or flush with the upper end of the annular vertical wall 2-1 of the outer cover 2 and is welded and fixed. The inner and outer diameters of the annular vertical wall 3-3 on the outer cover 2 are both larger than the inner and outer diameters of the annular vertical wall 2-1. The annular inclined wall 2-2 connects the annular vertical wall 2-1 and the annular vertical wall 3-3 obliquely outward and downward. Several heat dissipation holes 2-4 are provided on the side wall of the annular vertical wall 3-3.

[0045] In this embodiment, the top frame 1 is provided with an annular vertical wall 1-1 and an annular open wall 1-2 located at the upper end of the annular vertical wall. The annular open wall 1-2 has a trumpet-shaped outward expansion structure, and the top frame 1 is sleeved on the annular vertical wall 2-1 through the annular vertical wall 1-1. The annular inclined wall 2-2 restricts the pre-installation position of the top frame 1 on the outer cover 2. The top frame 1 and the outer cover 2 can be fixed by welding.

[0046] Preferably, the annular open wall 1-2 on the top frame 1 can receive the open flame along the upper edge of the inner wall of the outer liner 3, so that there will be an open flame within the range of the annular open wall 1-2 of the top frame 1, and the heat generated by the combustion of the burning material is relatively uniform within the range of the annular open wall 1-2 of the top frame 1, thus avoiding centralized heating.

[0047] To facilitate the addition of combustibles to the inner liner 4, a side opening 1-3 is provided on the side wall of the annular open wall 1-2 of the top frame 1. The side opening 1-3 is connected to the upper end of the annular open wall 1-2, and a horizontally outward-curving side 1-4 is provided at the lower end of the side opening 1-3. The upper end of the outer cover 2 is flush with the upper surface of the side 1-4. Preferably, the side 1-4 provides a platform for the combustibles when they are placed in the outer liner, making it easier to push the combustibles in for combustion.

[0048] Several heat dissipation holes 2-4 are provided on the annular vertical wall 3-3 of the outer cover 2. When the annular open wall 1-2 of the top frame 1 has an open flame generated by combustion, the heat energy transferred from the top frame 1 to the outer cover 2 through the annular vertical wall 1-1 is limited after being dissipated by the annular inclined wall 2-2 and the several heat dissipation holes 2-4. This can effectively reduce the probability of burns when the human body comes into contact with the annular vertical wall 3-3 of the outer cover 2.

[0049] In this embodiment, the outer liner 3 has an installation plate 7 fixed on its inner wall near the lower end of the enclosure 3-2 by welding or other means. The installation plate 7 is located below the inner liner 4. The fan 5 is fixed to the center of the installation plate 7 by screws or other structures. The installation plate 7 has an air inlet 7-1 that runs vertically through the fan 5 and is used to supply air into the air cavity.

[0050] To prevent the heat generated by the combustion of the combustible material in the inner liner 4 from causing high-temperature damage to the fan 5, an overhead plate 8 is provided above the mounting plate 7. The overhead plate 8 is fixed to the upper surface of the mounting plate 7 by at least three downward-extending support legs 8-1, and the at least three support legs 8-1 are distributed around the outer ring of the air inlet 7-1. A fireproof and heat-insulating plate 9 is provided on the overhead plate 8. At least three upward-extending and bendable flaps 8-2 are provided around the perimeter of the overhead plate 8. The flaps 8-2 limit the installation of the fireproof and heat-insulating plate 9, and the fireproof and heat-insulating plate 9 can also prevent sparks splashed from the air holes of the inner liner 4 from falling directly onto the fan 5, thus providing fireproof and heat-insulating protection for the fan 5. Preferably, the size of the fireproof and heat-insulating plate 9 is smaller than the inner wall size of the outer liner 3, and the size of the fireproof and heat-insulating plate 9 is larger than the size of the air inlet 7-1.

[0051] Preferably, a fireproof and heat-insulating board 9 may also be provided below the overhead board 8, and the periphery of the overhead board 8 is provided with at least three downward-extending and bendable flaps 8-2.

[0052] If the blower 5 is close to the ground where the wood-burning stove is placed during operation, the blower 5 will pick up dust and other substances from the ground, which will cause some damage to the blower 5. In order to reduce the occurrence of this situation, in this embodiment, the lower end of the annular vertical wall 3-3 of the outer cover 2 is lower than the lower end of the outer liner 3 wall 3-2, and at least three rotatable outward support legs are installed on the inner wall of the lower end of the outer cover 2. Each support leg consists of a hinged bracket 10 and a fixing member 11. The fixing member 11 is fixed to the inner wall of the annular vertical wall 3-3 by rivets or other structures. The bracket 10 can rotate outward, and at least three brackets 10 support the upright outer cover 2, so that the blower 5 is higher than the ground, reducing the picking up of dust and other debris from the ground. The bracket 10 can also rotate inward, and at least three brackets 10 can be stacked and stored inside the outer cover 2, reducing the storage space of the wood-burning stove.

[0053] In this embodiment, a bracket 12 is fixed on the inner wall of the annular open wall 1-2 of the top frame 1, and a support frame 13 is hinged on the bracket 12. The support frame 13 can be turned outward to the upper end of the annular open wall 1-2. An outward flange 1-5 is provided at the upper end of the annular open wall 1-2. The outward flange 1-5 can be horizontally outward or in a 7-shaped structure. The outward flange 1-5 restricts the outward turning angle of the support frame 13.

[0054] The bracket 12 is provided with a fitting part 12-1 and a mounting part 12-2. The support frame 13 is rotatably mounted on the mounting part 12-2. The fitting part 12-1 of the bracket 12 is fixed to the inner wall of the annular open wall 1-2 by a structure such as rivets. The mounting part 12-2 on the bracket 12 is offset from the inner wall of the annular open wall 1-2. The support frame 13, which is hinged to the mounting part 12-2, is limited inward turning angle by the fitting part 12-1 of the bracket 12. In order to prevent the kettle or pot or other utensils placed on the support frame 13 from slipping, the wall surface of the support frame 13 that contacts the kettle or pot or other utensils can be provided with a toothed or other anti-slip structure.

[0055] In the description of this invention, it should be noted that the terms "upper," "lower," "front," "rear," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed when in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0056] The above provides a detailed description of the high thermal energy utilization rate wood-fired stove provided by the present invention. Specific examples have been used to illustrate the principle and implementation of the present invention. The above description of the embodiments is only for the purpose of helping to understand the present invention and its core ideas. It should be noted that for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A wood-fired stove with high thermal energy utilization rate, including a top frame, outer cover, outer liner, inner liner and blower; The top frame is fitted over the outer cover, and the outer cover has several heat dissipation holes on its side wall, and at least three rotatable outward-folding support feet are installed on the inner wall of the lower end of the outer cover. The outer liner is fixed to the inner wall of the outer cover, and the inner liner is fixed to the inner wall of the outer liner, forming a wind cavity between the inner wall of the outer liner and the outer wall of the inner liner; The fan is located below the inner liner and is fixedly connected to the outer liner. The fan can supply air to the air cavity. Its features are, The top frame is provided with an annular vertical wall and an annular open wall at the upper end of the annular vertical wall. A side opening is provided on the annular open wall, and a horizontally outward-curved side is provided at the side opening. The upper end of the outer cover is flush with the upper end surface of the side. The outer cover is provided with an annular vertical wall II, an annular inclined wall and an annular vertical wall III in sequence from top to bottom. A number of heat dissipation holes are opened on the annular vertical wall III. The inner and outer diameters of the annular vertical wall III are larger than the inner and outer diameters of the annular vertical wall II. The top frame is fitted outside the annular vertical wall II through the annular vertical wall. The annular inclined wall restricts the pre-installation position of the top frame on the outer cover. The outer liner has an annular transition edge that is larger at the top and smaller at the bottom, and a surrounding wall located at the lower end of the annular transition edge. The upper end of the annular transition edge is flush with and fixed to the upper end of the outer cover. The fan is fixed inside the surrounding wall and is offset from the annular transition edge. The inner liner is provided with an annular stop edge that is larger at the top and smaller at the bottom, and a barrel wall located at the lower end of the annular stop edge. The inner liner is pre-installed and fixed to the inner wall of the annular transition edge by the annular stop edge. The lower end of the barrel wall is closed, and the closed end inside the barrel wall is provided with a locally spherical arch plate that is higher in the center and lower at the periphery. Several air holes are provided on the side wall of the barrel wall and the arch plate. An installation plate is fixed inside the enclosure, located below the inner liner. An air inlet is provided in the center of the installation plate, and the fan is fixed below the center of the installation plate. An overhead plate is provided above the mounting plate, and at least three downward-extending legs are provided below the overhead plate and fixed to the mounting plate. The at least three legs are distributed around the outer ring of the air inlet. A fireproof and heat-insulating board is fixed to the upper surface of the overhead board. The periphery of the overhead board is provided with at least three upward-extending and bendable flaps, which limit the installation of the fireproof and heat-insulating board. The size of the fireproof and heat-insulating board is smaller than the size of the inner wall of the outer liner, and the size of the fireproof and heat-insulating board is larger than the size of the air inlet; The aforementioned air holes are arranged in three groups on the barrel wall. The two groups of air holes located at the bottom and middle positions are each a single hole arranged in a ring, while the group of air holes located at the top consists of at least three obliquely distributed air holes as a unit, and the unit is arranged in a ring array. The diameter and number of individual holes in the bottom group of air vents are both greater than those in the middle group of air vents.

2. The wood-fired stove with high thermal energy utilization rate according to claim 1, characterized in that, The annular open wall has a trumpet-shaped outward expansion structure, and a bracket is fixed on the inner wall of the annular open wall. A support frame is hinged to the bracket, and the support frame can be flipped outward to the upper end of the annular open wall.

3. The wood-fired stove with high thermal energy utilization rate according to claim 2, characterized in that, The bracket has a fitting part that fits against the inner wall of the annular open wall, and a mounting part that deviates from the inner wall of the annular open wall. The support is hinged to the mounting part, and the upper end of the annular open wall has a 7-shaped outward flange. The fitting part and the outward flange limit the rotation angle of the support.

4. The wood-fired stove with high thermal energy utilization rate according to claim 1, characterized in that, The supporting leg consists of a hinged frame and a fixing member. The fixing member is fixed on the inner wall of the annular vertical wall three. The frame can rotate and flip outward. At least three frames support the outer cover.

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