A duct assembly

Abstract

The application provides a wind tube assembly, comprising a first wind tube, a guide vane and a cover plate, the first wind tube has an air inlet end and an air outlet end, the flow area of the air outlet end is larger than that of the air inlet end, the guide vane is arranged on the inner wall of the first wind tube to guide the airflow entering the first wind tube, the cover plate is further arranged on the inner wall of the first wind tube, the cover plate can prevent airflow backflow, and the first wind tube, the guide vane and the cover plate are integrally formed. According to the application, the functions of guiding, preventing backflow and diffusing airflow can be integrated, seamless connection can be formed, airflow loss caused by joints can be avoided from the root, airflow disturbance and energy loss caused by joint gaps can be avoided, the structure is more stable, the airflow is smoother, the efficiency of the wind tube assembly is improved, the energy consumption is reduced, the operation cost is reduced, and the problem of airflow disturbance in the prior art wind tube structure is effectively solved.

Description

Technical Field

[0001] This invention relates to the field of ventilation duct technology, and more specifically to a ventilation duct assembly. Background Technology

[0002] In animal husbandry, fans are essential equipment for ventilation, cooling, dehumidification, and improving air quality inside livestock sheds. Traditional livestock fans typically consist of components such as a fan duct, motor, fan blades, guide vanes, and dampers. Each component functions relatively independently, and the structure is somewhat dispersed. Among them, guide vanes are mainly used to regulate airflow direction and improve fan efficiency, dampers are used to prevent over- and under-air flow, and diffusers are used to evenly distribute high-speed airflow throughout the shed space.

[0003] However, in existing technologies, guide vanes, dampers, and diffusers are often designed and installed independently, resulting in a complex overall structure, large space occupation, and inconvenient installation and maintenance. Furthermore, during actual operation, there may be airflow interference or efficiency loss between the components, affecting the overall performance and effectiveness of the fan.

[0004] Because existing duct structures suffer from airflow disturbance and airflow loss, this invention researches and designs a duct assembly. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect of airflow disturbance in the existing duct structure, thereby providing a duct assembly.

[0006] To address the above problems, the present invention provides a ventilation duct assembly, comprising: The first air duct, the guide vanes, and the cover plate are provided. The first air duct has an air inlet and an air outlet. The flow area of ​​the air outlet is larger than that of the air inlet. The guide vanes are disposed on the inner wall of the first air duct to guide the airflow entering the first air duct. The cover plate is also disposed on the inner wall of the first air duct to prevent airflow backflow. The first air duct, the guide vanes, and the cover plate are integrally formed.

[0007] In some implementations... Inside the first air duct and along the direction from the air inlet to the air outlet, the flow area inside the first air duct gradually increases, forming a diffuser; the first air duct, the guide vanes, and the cover plate are integrally injection molded.

[0008] In some implementations... The guide vane is positioned to connect with the air inlet, and the cover plate is positioned at or connected to the air outlet; the cover plate is a damper structure that only allows airflow to flow out of the air outlet from inside the first air duct.

[0009] In some implementations... The damper structure comprises at least two damper structures, each of which is connected to a rotating shaft and rotates around the rotating shaft. The damper structure can only open the air outlet to release air when it is impacted by the airflow inside the first air duct and rotates in a direction away from the first air duct. When the damper structure is impacted by the backflow of airflow outside the air outlet, the damper structure closes the air outlet and will not rotate further into the first air duct.

[0010] In some implementations... The inner diameter of the air inlet is D. Along the axial direction of the first air duct, in the axial section passing through the axial direction, the angle between the outer peripheral wall of the first air duct and the plane where the air inlet is located is α, and α is located in the range of 94°~100°.

[0011] In some implementations... The axial length between the air inlet and the air outlet is L, and 300mm≤L≤1000mm. The wall thickness of the first air duct is 10~15mm.

[0012] In some implementations... The radially outer end of the guide vane is integrally connected to the inner wall of the first air duct. There are multiple guide vanes, which are distributed at intervals along the circumferential direction of the first air duct, and the number of guide vanes is 5 to 9.

[0013] In some implementations... The guide vane includes a head and a tail, and has a central axis inside the guide vane, which connects the head and the tail. The guide vane also has a windward side and a leeward side, and the distance between the windward side and the leeward side in a direction perpendicular to the central axis is the thickness T of the guide vane, and T>3mm.

[0014] In some implementations... It also includes a second air duct, the air outlet of which is connected to the air inlet of the first air duct. The second air duct is also equipped with a fan blade assembly and a motor. The fan blade assembly is opposite to the guide vanes and can be driven to rotate by the motor. The second air duct is a straight cylinder with an inner diameter of D. The inner diameter of the air inlet of the first air duct is also D.

[0015] In some implementations... A radially inner end of the guide vane is connected with a first hub, the fan blade assembly includes a second hub, and a diameter of the first hub is smaller than a diameter of the second hub.

[0016] The air duct assembly provided by the present invention has the following beneficial effects: 1. In the present invention, by arranging the guide vanes and the cover plate structure in the first air duct at the same time, the flow area at the air outlet end of the first air duct is larger than that at the air inlet end, so that a diffusion flow structure can be formed. The guide vanes can enhance the guide diffusion flow in the first air duct, and the cover plate structure can effectively achieve the function and effect of preventing backflow at the air outlet end of the first air duct. Furthermore, the first air duct, the guide vanes and the cover plate of the present invention are of an integrally formed structure, which integrates the functions of flow guiding, backflow prevention and diffusion flow, and can form a seamless connection, fundamentally avoiding air flow loss caused by joints, avoiding air flow disturbance and energy loss caused by connecting gaps, resulting in a more stable structure, smoother air flow, improved efficiency of the air duct assembly, reduced energy consumption and lowered operating costs; it effectively solves the problem of air flow disturbance existing in the air duct structure in the prior art; it can also reduce the number of parts, simplify the system structure, and improve the efficiency of installation and maintenance.

[0017] 2. The present invention further sets the value of α within the range of 94° to 100°, which can reduce eddy currents formed due to air flow separation, reduce eddy current loss, and improve fan performance. The value of L is within the range of 300mm < L < 1000mm, which provides space for air flow adjustment, makes the air flow at the air outlet stable, and reduces air flow disturbance loss. The air volume and energy efficiency ratio of the present invention are much greater than those of the air duct assembly in the prior art. Description of Drawings

[0018] Figure 1 is a perspective structural view of the first air duct part of the air duct assembly of the present invention; Figure 2 is Figure 1 is a partial enlarged view of part I in; Figure 3 is Figure 1 is a front structural view of the first air duct part of; Figure 4 is Figure 1 is a rear structural view of the first air duct part of; Figure 5 is Figure 1 is a side internal structural view of the first air duct part of; Figure 6 is Figure 1 is an airfoil cross-sectional view of the guide vane of the first air duct part of; Figure 7 is an exploded structural view of the air duct assembly of the present invention including the first and second air duct parts.

[0019] The reference numerals in the attached figures are as follows: 1. Guide vane; 11. First hub; 2. First air duct; 21. Air inlet; 22. Air outlet; 3. Cover plate; 4. Fan blade assembly; 41. Second hub; 5. Second air duct; 6. Motor; 7. Motor bracket. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0022] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0023] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0024] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0025] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0026] like Figure 1-7 As shown, the present invention provides a duct assembly, which includes: The first air duct 2, the guide vane 1, and the cover plate 3 are provided. The first air duct 2 has an air inlet end 21 and an air outlet end 22. The flow area of ​​the air outlet end 22 is larger than that of the air inlet end 21. The guide vane 1 is disposed on the inner wall of the first air duct 2 to guide the airflow entering the first air duct 2. The cover plate 3 is also disposed on the inner wall of the first air duct 2 to prevent airflow backflow. The first air duct 2, the guide vane 1, and the cover plate 3 are integrally formed.

[0027] This invention, by simultaneously incorporating guide vanes and a cover plate structure within the first air duct, leverages the larger flow area at the air outlet compared to the air inlet of the first air duct to create a diffused flow structure. The guide vanes enhance the guiding and diffused flow within the first air duct, while the cover plate effectively prevents backflow at the air outlet. Furthermore, the first air duct, guide vanes, and cover plate are integrally formed, integrating guiding, backflow prevention, and diffused flow functions into a seamless connection. This eliminates airflow loss caused by seams and prevents airflow disturbance and energy loss due to gaps, resulting in a more stable structure, smoother airflow, improved air duct component efficiency, reduced energy consumption, and lower operating costs. It effectively solves the airflow disturbance problem in existing air duct structures, reduces the number of components, simplifies the system structure, and improves installation and maintenance efficiency.

[0028] This invention proposes a novel fan structure that integrates airflow guidance, diffusion, and backflow prevention functions. It aims to optimize airflow path, improve ventilation efficiency, simplify system structure, and enhance the maintainability and applicability of the equipment. This results in a compact, functionally integrated, and highly efficient fan design scheme, thereby improving the overall performance of livestock fans, reducing energy consumption, and enhancing the stability and adaptability of ventilation systems.

[0029] In some implementations... Inside the first air duct 2 and along the direction from the air inlet 21 to the air outlet 22, the flow area inside the first air duct 2 gradually increases, forming a diffuser tube; the first air duct 2, the guide vane 1 and the cover plate 3 are integrally injection molded.

[0030] This is a further preferred structural form of the first air duct of the present invention, namely, forming a frustum-shaped air duct structure with a gradually increasing flow area from the air inlet end to the air outlet end, effectively forming a diffuser structure. Part of the first air duct, guide vanes and cover plate of the present invention are preferably integrally injection molded into a single structure, which can further form a seamless connection, further reduce airflow disturbance and airflow loss, make the structure more stable, make the airflow smoother, improve the efficiency of the air duct assembly, reduce energy consumption and lower operating costs.

[0031] The diffuser of this invention is preferably a circular flared nozzle device with an inlet diameter of D, which is the same as the diameter of the fan duct. When the airflow discharged from the fan enters the diffuser, the airflow velocity gradually decreases as the cross-sectional area of ​​the diffuser gradually increases. According to the principle of energy conservation, the decrease in airflow velocity is converted into an increase in static pressure. This increases the effective static pressure of the fan, thereby improving ventilation efficiency.

[0032] In some implementations... The guide vane 1 is positioned to connect with the air inlet end 21, and the cover plate 3 is positioned at the air outlet end 22 or at a position connected with the air outlet end 22; the cover plate 3 is a damper structure that only allows airflow to flow out of the air outlet end 22 from inside the first air duct 2.

[0033] This is the preferred setting position of the guide vane and cover plate of the present invention. The guide vane is used to effectively guide the gas entering the diffuser and reduce airflow separation. The cover plate is set at the air outlet to prevent the airflow outside the air outlet from entering the interior of the diffuser, thus forming an effective anti-backflow function and effect.

[0034] In some implementations... The damper structure comprises at least two damper structures, each of which is connected to a rotating shaft and rotates around the shaft. The damper structure can only open the air outlet 22 to release air when it is impacted by the airflow inside the first air duct 2. When the damper structure is impacted by the backflow of airflow outside the air outlet 22, the damper structure closes the air outlet 22 and does not rotate towards the inside of the first air duct 2.

[0035] This is a further preferred structural form of the damper structure of the present invention, namely, the damper is opened by rotating the connecting shaft to allow air to flow outwards, while it is blocked from rotating into the diffuser tube, thus effectively preventing the external airflow from flowing back into the diffuser tube from the air outlet end, further improving the backflow prevention effect of the diffuser tube air outlet end.

[0036] In some implementations... The inner diameter of the air inlet 21 is D. Along the axial direction of the first air duct 2, in the axial section passing through the axis, the angle between the outer peripheral wall of the first air duct 2 and the plane where the air inlet 21 is located is α, and α is within the range of 94° to 100°. The present invention, through the above-mentioned preferred structure, wherein the angle between the diffuser wall and the vertical direction is α, and the value of α is between 94° and 100°, can avoid the airflow being unable to adhere tightly to the diffuser wall due to inertia when the angle of α is too large, resulting in airflow separation and the formation of eddies, which reduce the performance of the fan due to eddy current loss; thereby, it can reduce the eddies formed by airflow separation, reduce eddy current loss, and improve the performance of the fan.

[0037] In some implementations... The axial length between the air inlet end 21 and the air outlet end 22 is L, and 300mm≤L≤1000mm. The wall thickness of the first air duct 2 is 10~15mm.

[0038] Through the arrangement of the wall thickness dimension of the first air duct above, the present invention can ensure the rigidity of the overall structure and also have the lightness of the structure. The length of the duct wall can provide space for airflow adjustment, so that the airflow at the air outlet is stable, and the loss caused by airflow disturbance is further reduced.

[0039] In the present invention, by preferably setting α within the range of 94° to 100°, the vortex formed by airflow separation can be reduced, the vortex loss is decreased, and the performance of the fan is improved. When L is within the range of 300mm<L<1000mm, it provides space for airflow adjustment, so that the airflow at the air outlet is stable and the loss caused by airflow disturbance is reduced. The air volume and energy efficiency ratio of the present invention are much greater than those of the air duct assembly in the prior art. For details, see Table 1 below.

[0040] Table 1

[0041] The effect of the novel fan structure of the present invention on improving fan performance is shown in Table 1. The original solution is simulation data without the novel fan structure, and the last 4 columns are the implementation effects of various technical parameter combinations within the scope of the technical solution of the present invention. Four different novel fan structures are simulated and analyzed, wherein the length of the air duct is 0.3m to 1m, and the degree of α is 94° to 100°. The energy efficiency ratio is increased from 9.518 to 11.815, and the air volume is increased from 6378m^3 / h to 7978m^3 / h. The performance (air volume and energy efficiency ratio) of the air duct assembly with a brand-new structure of the present invention is higher than that of the air duct assembly in the prior art.

[0042] Therefore, it can be seen from the above table that in the present invention, by preferably setting α within the range of 94° to 100° and setting L within the range of 300mm<L<1000mm, compared with the original solution in the prior art, the air volume and the energy efficiency ratio are improved.

[0043] Beneficial effects of the present invention: 1. Integrated structure design: the functions of flow guiding, backflow prevention and diffusion flow are integrated into one, especially the integrally formed structure avoids airflow disturbance and energy loss caused by connecting gaps, the structure is more stable, the airflow is smoother, the efficiency of the air duct assembly is improved, energy consumption is reduced, the number of parts is reduced, the system structure is simplified, and the efficiency of installation and maintenance is improved.

[0044] 2. Optimized airflow path: through reasonable design of guide vane angle, air valve opening and diffuser shape, the direction and distribution of airflow are optimized, and the overall efficiency of the fan is improved.

[0045] 3. Energy conservation and environmental protection: the integrated design effectively reduces airflow resistance and energy loss, improves the operation efficiency of the fan, reduces energy consumption, and achieves the goal of green energy conservation.

[0046] In some embodiments, The radial outer end of the guide vane 1 is integrally connected to the inner wall of the first air duct 2. There are multiple guide vanes 1, which are distributed at intervals along the circumferential direction of the first air duct 2, and the number of guide vanes 1 is 5 to 9.

[0047] This is a further preferred structural form of the guide vane of the present invention, namely, its radial outer end (i.e., tail) is fixed to the inner wall of the first air duct to form an integral structure. The guide vane of the present invention is fixed and does not rotate. The present invention can further improve the guiding effect and efficiency of the airflow entering the diffuser by means of multiple guide vanes spaced apart in the circumferential direction.

[0048] In some implementations... The guide vane 1 includes a head and a tail, and has a central axis inside the guide vane 1, which connects the head and the tail. The guide vane 1 also has a windward side and a leeward side, and the distance between the windward side and the leeward side in a direction perpendicular to the central axis is the thickness T of the guide vane 1, and T>3mm.

[0049] The present invention preferably sets the blade thickness to T>3mm, which can increase the blade strength while further improving the airflow guiding effect.

[0050] In some implementations... It also includes a second air duct 5, the air outlet of the second air duct 5 is connected to the air inlet 21 of the first air duct 2, and the second air duct 5 is also provided with a fan blade assembly 4 and a motor 6. The fan blade assembly 4 is opposite to the guide vane 1, and the fan blade assembly 4 can be driven to rotate by the motor 6. The second air duct 5 is a straight cylinder structure with an inner diameter of D, and the inner diameter of the air inlet 21 of the first air duct 2 is also D.

[0051] The present invention, through the above-mentioned arrangement of the second air duct, can be connected to the air inlet end of the diffuser of the first air duct. The second air duct is formed as a straight cylindrical structure that drives the gas flow. The rotation of the internal fan blade assembly generates the airflow driving effect, so that the airflow energized by the fan blade assembly enters the first air duct for diffusion flow, thereby enhancing the stability of the airflow and increasing the static pressure.

[0052] This invention provides a novel fan structure with flow guiding, flow diffusion, and backflow prevention functions. It includes structural guide vanes 1 and a first air duct 2 (diffuser). The guide vanes and diffuser are injection molded as a single unit. A backflow prevention cover 3 is installed at the outlet of the diffuser, preferably injection molded as a single unit with the first air duct or fixed with screws. This novel first air duct structure is installed at the outlet of a second air duct 5. The second air duct includes a fan blade assembly 4 and a motor 6. The fan blade assembly 4 is fixed to the motor 6, and the motor is mounted on a motor bracket 7. Its advantages are: the novel fan structure simultaneously possesses flow guiding, backflow prevention, and flow diffusion functions; the overall fan structure is installed at the air duct outlet; the fan structure is compact, functionally integrated, operates efficiently, is easy to assemble and disassemble, and is convenient for transportation.

[0053] In some implementations... The radial inner end of the guide vane 1 is connected to a first hub 11, and the wind blade assembly 4 includes a second hub 41, wherein the diameter of the first hub 11 is smaller than the diameter of the second hub 41.

[0054] The present invention further ensures that the airflow transmitted by the wind turbine's wind turbine assembly passes fully through the guide vanes by setting the hub diameter of the guide vanes to be smaller than that of the wind turbine's hub diameter. The airflow is eliminated by the guide vanes, and the kinetic energy of the airflow rotation is converted into static pressure, so that the airflow becomes axial flow.

[0055] The overall fresh air unit structure (first air duct) of the present invention is installed on the second air duct. The air inlet end and the air outlet end of the first air duct (diffuser) have connecting plates. The diffuser and the air duct can be connected through several screw holes. The air inlet end of the diffuser and the air outlet end of the air duct are provided with several screw holes with a diameter of 8~12mm, which can meet the strength requirements when fixing.

[0056] This invention can solve the following technical problems: 1. Airflow interference and low efficiency: Airflow interference between components can easily occur due to assembly and design dimensions, affecting the overall aerodynamic performance of the fan and reducing ventilation efficiency.

[0057] 2. High energy consumption and high operating costs: Due to the unreasonable airflow path, energy loss is relatively large, resulting in high energy consumption of the fan, which is not conducive to the sustainable development of animal husbandry.

[0058] 3. Complex structure and inconvenient installation and maintenance: In traditional livestock industry fans, in order to optimize fan performance and reduce losses, various functional structures are superimposed on the basic fan duct structure. The superimposed guide vanes, air valves and diffusers are independent components, resulting in a complex overall structure, cumbersome installation and difficult maintenance.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A ventilation duct assembly, characterized in that: include: The first air duct (2), the guide vane (1), and the cover plate (3) are provided. The first air duct (2) has an air inlet (21) and an air outlet (22). The flow area of ​​the air outlet (22) is larger than that of the air inlet (21). The guide vane (1) is disposed on the inner wall of the first air duct (2) to guide the airflow entering the first air duct (2). The cover plate (3) is also disposed on the inner wall of the first air duct (2). The cover plate (3) can prevent the airflow from flowing back. The first air duct (2), the guide vane (1), and the cover plate (3) are integrally formed. Inside the first air duct (2) and along the direction from the air inlet (21) to the air outlet (22), the flow area inside the first air duct (2) gradually increases, forming a diffuser; the first air duct (2), the guide vane (1) and the cover plate (3) are integrally injection molded; The guide vane (1) is positioned to connect with the air inlet end (21), and the cover plate (3) is positioned at the air outlet end (22); the cover plate (3) is a damper structure that only allows airflow to flow out of the air outlet end (22) from inside the first air duct (2).

2. The duct assembly according to claim 1, characterized in that: The damper structure consists of at least two damper structures, each of which is connected to a rotating shaft and rotates around the shaft. The damper structure can only open the air outlet (22) to release air when it is impacted by the airflow inside the first air duct (2). When the damper structure is impacted by the backflow of airflow outside the air outlet (22), the damper structure closes the air outlet (22) and does not rotate towards the inside of the first air duct (2).

3. The duct assembly according to claim 1, characterized in that: The inner diameter of the air inlet (21) is D. Along the axial direction of the first air duct (2), in the axial section passing through the axial direction, the angle between the outer peripheral wall of the first air duct (2) and the plane where the air inlet (21) is located is α, and α is located in the range of 94°~100°.

4. The duct assembly according to claim 1, characterized in that: The axial length between the air inlet (21) and the air outlet (22) is L, and 300mm≤L≤1000mm. The wall thickness of the first air duct (2) is 10~15mm.

5. The duct assembly according to claim 1, characterized in that: The radial outer end of the guide vane (1) is integrally connected to the inner wall of the first air duct (2). There are multiple guide vanes (1), and the multiple guide vanes (1) are distributed at intervals along the circumferential direction of the first air duct (2), and the number of guide vanes (1) is 5 to 9.

6. The duct assembly according to claim 1, characterized in that: The guide vane (1) includes a head and a tail, and has a central axis inside the guide vane (1) that connects the head and the tail. The guide vane (1) also has a windward side and a leeward side, and the distance between the windward side and the leeward side in a direction perpendicular to the central axis is the thickness T of the guide vane (1), and T>3mm.

7. The duct assembly according to claim 1, characterized in that: It also includes a second air duct (5), the air outlet of the second air duct (5) is connected to the air inlet (21) of the first air duct (2), and the second air duct (5) is also provided with a fan blade assembly (4) and a motor (6). The fan blade assembly (4) is opposite to the guide vane (1), and the fan blade assembly (4) can be driven to rotate by the motor (6). The second air duct (5) is a straight cylinder structure with an inner diameter of D. The inner diameter of the air inlet (21) of the first air duct (2) is also D.

8. The duct assembly according to claim 7, characterized in that: The radial inner end of the guide vane (1) is connected to a first hub (11), and the wind turbine assembly (4) includes a second hub (41), and the diameter of the first hub (11) is smaller than the diameter of the second hub (41).

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