Air duct structure and combustion equipment

Abstract

The invention relates to an air duct structure and combustion equipment, and the air duct structure comprises an air bin provided with an air uniformizing cavity, an input port and a mounting port, the input port and the mounting port are both communicated with the air uniformizing cavity, the input port is used for inputting air, and an air inlet part of a combustion device can stretch into the air uniformizing cavity through the mounting port; and the gas uniformizing piece is arranged in the gas uniformizing cavity and located between the input port and the mounting port, a plurality of communicating parts are formed in the gas uniformizing piece, and the total overflowing area of each communicating part is gradually increased in the direction away from the input port. The flow of the mixed gas entering the gas inlet space through the communicating part close to the input port and the flow of the mixed gas entering the gas inlet space through the communicating part far away from the input port can be controlled to be close to the level, so that the mixed gas can be uniformly dispersed in the gas inlet space through each communicating part; the uniformity of the mixed gas entering the gas inlet part of the combustion device from the gas inlet space is improved, finally the combustion uniformity of the mixed gas in the combustion device is improved, and the combustion efficiency of the whole combustion equipment is improved.

Description

Technical Field

[0001] The present application relates to the technical field of water heaters, and particularly to an air duct structure and a combustion device. Background Art

[0002] A gas water heater uses gas as an energy source, heats water by the heat generated from gas combustion, and enables the water temperature to meet the requirements of life, heating, production processes, etc. After gas is mixed with air in a certain proportion to form a mixed gas, the mixed gas is input into the air chamber of the gas water heater through an air duct. The mixed gas diffuses into the combustion device of the gas water heater in the air chamber, and finally combustion is completed in the combustion device.

[0003] Among them, after the mixed gas is input into the air chamber from the air duct, the flow space of the mixed gas in the air chamber suddenly increases, resulting in a higher gas concentration near the air duct in the air chamber and a lower gas concentration far from the air duct. As a result, the distribution of the mixed gas in the combustion device is uneven, and finally the combustion of the combustion device is uneven. Summary of the Invention

[0004] Based on this, in view of the problem of uneven distribution of the mixed gas in the combustion device, it is necessary to provide an air duct structure and a combustion device.

[0005] An air duct structure includes:

[0006] An air chamber is provided with a gas equalizing cavity, an input port and an installation port both connected to the gas equalizing cavity. The input port is used for inputting gas, and the air intake part of the combustion device can extend into the gas equalizing cavity through the installation port;

[0007] A gas equalizing member is arranged in the gas equalizing cavity and located between the input port and the installation port (13). The gas equalizing member is provided with a plurality of communication parts, and the total flow-through area of each communication part gradually increases in a direction away from the input port.

[0008] In one embodiment, each communication part includes a through-hole, and the diameter of the through-hole of each communication part gradually increases in a direction away from the input port.

[0009] And / or, the number of through-holes of each communication part gradually increases in a direction away from the input port.

[0010] In one embodiment, each communication part includes a plurality of through-holes arranged in a row, and the through-holes of each communication part are arranged in an array on the gas equalizing member.

[0011] In one embodiment, the air duct structure further includes a mixing air duct and a flow disturbing component. The mixing air duct is connected to the input port, and the flow disturbing component is disposed in the mixing air duct for disturbing the gas.

[0012] In one embodiment, the flow disturbing component includes a swirler which includes a plurality of first blades. The plurality of first blades are radially arranged around a first axis, and the first axis is parallel to the longitudinal direction of the mixing air duct.

[0013] In one embodiment, the windward surface of at least one of the first blades is perpendicular to the longitudinal direction of the mixing air duct.

[0014] In one embodiment, the windward surfaces of all the first blades intersect with the cross-section of the mixing air duct, and the cross-section of the mixing air duct is perpendicular to the longitudinal direction of the mixing air duct.

[0015] In one embodiment, the flow disturbing component further includes a flow disturbing member. The flow disturbing member is located on the side of the swirler away from the gas inlet. The flow disturbing member includes a plurality of second blades. The plurality of second blades are radially arranged around a second axis, and the second axis is parallel to the longitudinal direction of the mixing air duct.

[0016] In one embodiment, there are a plurality of the flow disturbing members which are arranged at intervals along the longitudinal direction of the mixing air duct. The second blades of each flow disturbing member are staggeredly arranged with the second blades of the adjacent flow disturbing member.

[0017] In one embodiment, the windward surfaces of all the second blades are perpendicular to the longitudinal direction of the mixing air duct.

[0018] In one embodiment, the air distributing member is installed in the air chamber. The air duct structure further includes a connecting shaft. One end of the connecting shaft is connected to the air distributing member, and the other end extends into the mixing air duct. The flow disturbing component is installed on the connecting shaft.

[0019] A combustion device includes a combustion apparatus and the air duct structure as described in any one of the above.

[0020] For the above air duct structure, the flow rates of the mixed gas entering the intake space through the communication parts near the input port and the flow rates of the mixed gas entering the intake space through the communication parts far from the input port can be controlled at a nearly equal level, so that the mixed gas can be evenly dispersed in the intake space through each communication part, thereby improving the uniformity of the mixed gas entering the intake part of the combustion apparatus from the intake space, and finally improving the combustion uniformity of the mixed gas in the combustion apparatus and the combustion efficiency of the whole combustion device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of the air duct structure in some embodiments of the present application.

[0022] Figure 2 is Figure 1 a schematic internal structure diagram of the air duct structure in the embodiment.

[0023] Figure 3 is Figure 1 a schematic structural diagram of the flow equalizing member and the flow disturbing assembly in the embodiment.

[0024] Explanation of the reference numerals in the drawings:

[0025] Air storage bin 10, air equalizing cavity 11; input port 12; installation port 13;

[0026] Air equalizing member 20; communicating portion 21; communicating hole 22; connecting shaft 23;

[0027] Mixing air duct 30; air inlet 31; gas inlet 32;

[0028] Flow disturbing assembly 40; swirler 41; first blade 42; flow disturbing member 43; second blade 44;

[0029] Combustion device 50; air intake portion 51. Detailed implementation manners

[0030] To make the above objects, features, and advantages of the present application more apparent and understandable, the following will describe in detail the specific implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0031] In the description of the present application, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0032] In addition, if the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0033] In this application, unless otherwise clearly stipulated and defined, if terms such as "installed", "connected", "joined", "fixed", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] In this application, unless otherwise clearly stipulated and defined, if there is a description such as a first feature being "on" or "under" a second feature, its meaning can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over", and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath", and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature has a lower horizontal height than the second feature.

[0035] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right", and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0036] Refer to Figure 1 、 Figure 2 and Figure 3, a combustion device provided by an embodiment of the present application includes a combustion device 50 and a duct structure for delivering combustible gas to the combustion device 50. The duct structure includes a mixing duct 30, an air chamber 10, and an air homogenizing member 20. The duct structure also has an air inlet 31 and a gas inlet 32 that are connected to the mixing duct 30. Air and gas are respectively input into the mixing duct 30 from the air inlet 31 and the gas inlet 32, and are mixed in the mixing duct 30 to form a mixed gas. The mixed gas is input into the air chamber 10 after passing through the mixing duct 30, and diffuses in the air chamber 10. The diffused mixed gas enters the combustion device 50, and finally combustion is completed in the combustion device 50.

[0037] The air chamber 10 is provided with a homogenizing cavity 11 and an input port 12 that are both connected to the homogenizing cavity 11. The input port 12 is connected to the mixing duct 30. Air and gas form a combustible mixed gas in the mixing duct 30 and enter the homogenizing cavity 11 through the input port 12. Among them, the air chamber 10 is also provided with an installation port 13 that is connected to the homogenizing cavity 11. The air intake part 51 of the combustion device 50 extends into the homogenizing cavity 11 through the installation port 13, so that the combustible mixed gas in the homogenizing cavity 11 can enter the combustion device 50.

[0038] Among them, the air homogenizing member 20 is arranged in the homogenizing cavity 11 and is located between the input port 12 and the installation port 13. That is, the homogenizing cavity 11 is divided by the air homogenizing member 20 to form a diffusion space near the input port 12 and an air intake space near the installation port 13. When the mixed gas enters the mixing cavity from the input port 12, the mixed gas will be blocked by the air homogenizing member 20, and the mixed gas cannot directly enter the air intake part 51 of the combustion device 50, but will diffuse in the diffusion space.

[0039] Furthermore, the air homogenizing member 20 is provided with a plurality of communication parts 21. The communication parts 21 are used to connect the diffusion space and the air intake space. The flow area of each communication part 21 gradually increases in the direction away from the input port 12. Thus, when the mixed gas diffuses in the diffusion space, it will enter the air intake space through the communication parts 21. And because the flow rate of the mixed gas is fast near the input port 12 in the diffusion space, but the flow area of the communication part 21 near the input port 12 is small, and at the same time the flow rate of the mixed gas is fast in the place far from the input port 12 in the diffusion space, but the flow area of the communication part 21 far from the input port 12 is large, finally the flow rate of the mixed gas in each communication part 21 is kept at a similar level.

[0040] Thus, for the above air duct structure, the flow rates of the mixed gas entering the intake space through the connecting part 21 close to the input port 12 and the flow rate of the mixed gas entering the intake space through the connecting part 21 far from the input port 12 can be controlled to be at a similar level, so that the mixed gas can be evenly dispersed in the intake space through each connecting part 21. Furthermore, the uniformity of the mixed gas entering the intake part 51 of the combustion device 50 from the intake space is improved, and finally the combustion uniformity of the mixed gas in the combustion device 50 is improved, thereby improving the combustion efficiency of the entire combustion equipment.

[0041] In some embodiments of the present application, in order to connect the diffusion space and the intake space, each connecting part 21 includes a through-hole 22 arranged therethrough, and the mixed gas in the diffusion space can enter the intake space through the through-hole 22 arranged therethrough. Thus, the total flow-through area of the connecting part 21 refers to the total area of the through-holes 22 in the connecting part 21.

[0042] If it is necessary to change the total flow-through area of the connecting part 21, and if the number of through-holes 22 in each connecting part 21 is the same, the diameter of the through-holes 22 in each connecting part 21 can be changed to make the areas of the through-holes 22 in each connecting part 21 different. Specifically, in some embodiments of the present application, the diameter of the through-hole 22 of each connecting part 21 gradually increases in the direction away from the input port 12. When the number of through-holes 22 in each connecting part 21 is the same, the larger the diameter of the through-hole 22 of the connecting part 21 far from the input port 12, the larger the total flow-through area of the connecting part 21 far from the input port 12, and the smaller the diameter of the through-hole 22 of the connecting part 21 close to the input port 12, the smaller the total flow-through area of the connecting part 21 close to the input port 12.

[0043] If the diameter of the through-holes 22 in each connecting part 21 remains the same, the total flow-through area of the connecting part 21 can also be changed by changing the number of through-holes 22 in each connecting port. Specifically, in some embodiments of the present application, the number of through-holes 22 of each connecting part 21 gradually increases in the direction away from the input port 12. When the diameter of the through-holes 22 in each connecting part 21 remains the same, the more the number of through-holes 22 of the connecting part 21 far from the input port 12, the larger the total flow-through area of the connecting part 21 far from the input port 12, and the fewer the number of through-holes 22 of the connecting part 21 close to the input port 12, the smaller the total flow-through area of the connecting part 21 far from the input port 12.

[0044] It can be understood that in some other embodiments, the diameters and numbers of the through-holes 22 in each connecting part 21 are not the same. For example, the diameter and number of the through-holes 22 of each connecting part 21 gradually increase in the direction away from the input port 12 to increase the total flow-through area of the connecting part 21 by increasing the diameter and number of the through-holes 22 at the same time.

[0045] In some embodiments of the present application, each connecting part 21 includes a plurality of through - arranged connecting holes 22. The connecting holes 22 of each connecting part 21 are arranged in an array on the air - equalizing member 20. That is to say, the plurality of connecting holes 22 in each connecting part 21 are evenly arranged on the air - equalizing member, so that the mixed gas in the diffusion space can pass through the evenly arranged plurality of connecting holes 22 and be evenly diffused in the air inlet hole member, thereby further increasing the uniformity of the mixed gas in the air inlet space, and finally improving the combustion uniformity of the mixed gas in the combustion device 50 and the combustion efficiency of the whole combustion equipment.

[0046] In the actual use process, in addition to the distribution uniformity of the mixed gas in the air inlet space affecting the combustion efficiency of the whole combustion equipment, the mixing uniformity of the fuel gas and air in the mixed gas entering the combustion device 50 also affects the combustion efficiency of the whole combustion equipment. The fuel gas and air are mainly mixed by diffusion in the mixing air duct 30. However, due to the relatively fast flow rate of the fuel gas entering the mixing air duct 30 from the fuel gas inlet 32, the fuel gas may enter the air chamber 10 without being fully mixed with the air. Finally, the fuel gas that is not fully mixed with the air enters the combustion device 50, which will cause incomplete combustion, resulting in noise and vibration of the combustion equipment.

[0047] Therefore, in some embodiments of the present application, the air duct structure further includes a flow - disturbing component 40. The flow - disturbing member 43 is arranged in the mixing air duct 30 to disturb the gas in the mixing air duct 30. That is, during the process of the fuel gas and air being transported in the mixing channel, they will be disturbed by the flow - disturbing component 40, thereby changing the movement directions of the fuel gas and air, so that the fuel gas can be fully mixed with the air.

[0048] In some embodiments, the flow - disturbing component 40 includes a swirler 41. The swirler 41 includes a plurality of first vanes 42. The plurality of first vanes 42 are arranged radially around a first axis, and the first axis is parallel to the longitudinal direction of the mixing air duct 30. In this way, when the mixed gas formed by the air and the fuel gas moves in the mixing air duct 30, it will pass through the swirler 41 and be blocked by the plurality of first vanes 42, thereby slowing down the movement speeds of the air and the fuel gas, so that the two can move in the mixing air duct 30 for a longer time, thereby increasing their mixing effect. At the same time, the plurality of first vanes 42 on the swirler 41 can cut the air and the fuel gas, thereby dispersing the two, and further increasing their mixing effect.

[0049] It can be understood that by adjusting the angle of the windward surface of the first vane 42 relative to the flow direction of the mixed air flow, the swirler 41 can have different effects. For example, in some embodiments, the windward surfaces of all the first vanes 42 of the swirler 41 intersect with the longitudinal direction of the mixing air duct 30, and the longitudinal direction of the mixing air duct 30 is the flow direction of the mixed air flow. The contact area between the windward surface of the first vane 42 and the mixed air flow is large, so that the swirler 41 has the effects of blocking and cutting the mixed air flow at the same time, making the mixing of the mixed gas more uniform.

[0050] Specifically Figure 2 In the embodiment of, the windward surfaces of all the first vanes 42 intersect with the cross-section of the mixing air duct 30. The cross-section of the mixing air duct 30 refers to the plane perpendicular to the longitudinal direction of the mixing air duct 30, that is, the windward surface of the first vane 42 is at an angle that intersects but is not perpendicular to the flow direction of the air flow. For example, the first vane 42 can be curled, so that the swirler 41 can have a certain blocking effect on the mixed air flow, but at the same time, a certain degree of passability is also retained, so that the mixed gas can normally pass through the swirler 41, and the cutting effect of the first vane 42 that is inclined and not perpendicular to the flow direction of the mixed gas is better, thereby improving the mixing uniformity of the gas and air.

[0051] In some other embodiments, the windward surface of the first vane 42 is also parallel to the longitudinal direction of the mixing air duct 30. In this way, the cutting effect of the swirler 41 is more obvious, and the mixing uniformity of the mixed gas can also be improved.

[0052] In some embodiments, the turbulence component 40 further includes a turbulator 43. The turbulator 43 is located on the side of the swirler 41 away from the air inlet 31 and the gas inlet 32, that is, the air and gas input from the air inlet 31 and the gas inlet 32 will first pass through the swirler 41 and then through the turbulator 43. Each turbulator 43 further includes a plurality of second vanes 44, and the plurality of second vanes 44 are radially arranged around a second axis, and the second axis is parallel to the longitudinal direction of the mixing air duct 30. In this way, the air and gas in the mixing air duct 30 will first pass through the dispersion and mixing of the swirler 41, and then pass through the turbulator 43 for further dispersion and mixing, increasing the mixing times of the air and the gas, making the mixing time of the air and the gas longer, and the mixing uniformity better.

[0053] Specifically, in some embodiments, there are multiple spoiler members 43, and the multiple spoiler members 43 are arranged at intervals along the longitudinal direction of the mixing air duct 30, so as to further increase the mixing times of air and fuel gas through the multiple spoiler members 43. In order to ensure that each spoiler member 43 can produce a disturbing effect on the flow of the mixed gas, the second blades 44 of each spoiler member 43 are staggeredly arranged with the second blades 44 of the adjacent spoiler member 43, so that the mixed gas can sequentially contact the second blades 44 of each spoiler member 43. The flow path of the mixed gas flowing through the swirler 41 and each spoiler member 43 is "S-shaped", which extends the flow path of the mixed gas in the mixing air duct 30, increases the mixing time of air and fuel gas, and improves the mixing uniformity.

[0054] It can be understood that, similar to the principle of the swirler 41, by adjusting the angle of the windward surface of the second blade 44 relative to the flow direction of the mixed air flow, different disturbing effects can be achieved for the spoiler member 43. Therefore, only the case where the windward surfaces of all the second blades 44 are perpendicular to the longitudinal direction of the mixing air duct 30 in some embodiments is described. For the effects when the windward surface of the second blade 44 forms other angles with the longitudinal direction of the mixing air duct 30, reference can be made to the description of the above swirler 41, and details will not be elaborated here.

[0055] When the windward surfaces of all the second blades 44 are perpendicular to the longitudinal direction of the mixing air duct, the blocking effect of each second blade 44 on the mixed air flow is the best, thereby further extending the flow path of the mixed gas in the mixing air duct 30, increasing the mixing time of air and fuel gas, and improving the mixing uniformity.

[0056] In some embodiments, in order to fix the swirler 41 and the multiple spoiler members 43 in the mixing air duct 30, the air distributor is installed in the air storage chamber 10. The air duct structure further includes a connecting shaft. One end of the connecting shaft is connected to the air distributor 20, and the other end extends into the mixing air duct 30. The spoiler assembly 40 composed of the swirler 41 and the multiple spoiler members 43 is installed on the connecting shaft to fix the swirler 41 and the multiple spoiler members 43 through the connecting shaft.

[0057] The above air duct structure has at least the following effects:

[0058] The flow rate of the mixed gas entering the intake space through the communication part 21 near the input port 12 can be controlled to be close to the flow rate of the mixed gas entering the intake space through the communication part 21 far from the input port 12, so that the mixed gas can be evenly dispersed in the intake space through each communication part 21, thereby improving the uniformity of the mixed gas entering the intake part 51 of the combustion device 50 from the intake space, and finally improving the combustion uniformity of the mixed gas in the combustion device 50 and the combustion efficiency of the whole combustion equipment.

[0059] Optionally, the above combustion device is a gas water heater. In other embodiments, the above combustion device can also be a gas wall-mounted boiler, a gas stove, or other devices that require the use of gas for combustion, which are not limited herein.

[0060] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0061] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. An air duct structure, characterized in that, The air duct structure includes: An air storage bin (10) is provided with an air equalizing cavity (11), an input port (12) and a mounting port (13) both communicating with the air equalizing cavity (11). The input port (12) is used for inputting gas, and the air inlet part (51) of the combustion device (50) can extend into the air equalizing cavity (11) through the mounting port (13). An air equalizing member (20) is arranged in the air equalizing cavity (11) and located between the input port (12) and the mounting port (13). A plurality of communicating parts (21) are formed on the air equalizing member (20), and the total flow-through area of each communicating part (21) gradually increases in a direction away from the input port (12).

2. The air duct structure according to claim 1, characterized in that Each communicating part (21) includes a through-hole (22). The diameter of the through-hole (22) of each communicating part (21) gradually increases in a direction away from the input port (12), and / or the number of the through-holes (22) of each communicating part (21) gradually increases in a direction away from the input port (12).

3. The air duct structure according to claim 1, characterized in that Each communicating part (21) includes a plurality of through-holes (22) arranged in an array on the air equalizing member (20).

4. The air duct structure according to claim 1, wherein, The air duct structure further includes a mixing air duct (30) and a flow disturbing component (40). The mixing air duct (30) is connected to the input port (12), and the flow disturbing component (40) is arranged in the mixing air duct (30) for disturbing the gas.

5. The air duct structure according to claim 4, wherein The flow disturbing component (40) includes a swirler (41). The swirler (41) includes a plurality of first blades (42), and the plurality of first blades (42) are radially arranged around a first axis, and the first axis is parallel to the longitudinal direction of the mixing air duct (30).

6. The air duct structure according to claim 5, characterized in that, The windward surface of at least one of the first blades (42) is perpendicular to the longitudinal direction of the mixing air duct (30).

7. The air duct structure according to claim 6, wherein, The windward surfaces of all the first blades (42) intersect with the cross-section of the mixing air duct (30), and the cross-section of the mixing air duct (30) is perpendicular to the longitudinal direction of the mixing air duct (30).

8. The air duct structure according to claim 5, characterized in that, The flow disturbing component (40) further includes a flow disturbing member (43). The flow disturbing member (43) is located on a side of the swirler (41) away from the gas inlet. The flow disturbing member (43) includes a plurality of second blades (44), and the plurality of second blades (44) are radially arranged around a second axis, and the second axis is parallel to the longitudinal direction of the mixing air duct (30).

9. The air duct structure according to claim 8, characterized in that There are a plurality of the flow disturbing members (43), and the plurality of flow disturbing members (43) are arranged at intervals along the longitudinal direction of the mixing air duct (30). The second blades (44) of each flow disturbing member (43) are staggeredly arranged with the second blades (44) of the adjacent flow disturbing member (43).

10. The air duct structure according to claim 8, wherein, The windward surfaces of all the second blades (44) are perpendicular to the longitudinal direction of the mixing air duct (30).

11. The air duct structure according to claim 4, characterized in that, The air distribution member (20) is installed in the air storage chamber (10). The air duct structure further includes a connecting shaft. One end of the connecting shaft is connected to the air distribution member (20), and the other end extends into the mixing air duct (30). The flow disturbance assembly (40) is installed on the connecting shaft.

12. A combustion device, characterized in that, It includes a combustion device (50) and the air duct structure according to any one of claims 1-11.

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