Fairing, fan structure and air duct structure

Abstract

A fairing, a fan structure, and an air duct structure. The fairing comprises a plurality of bent portions, wherein at least two bent portions are nested with each other in sequence, and each of the bent portions is provided with a flow-straightening opening; and in a first direction, the projections of at least two of the plurality of bent portions overlap. When an airflow flows in the first direction, the airflow may sequentially pass through at least two bent portions. Each time the airflow passes through one bent portion, the airflow is straightened by the bent portion, so as to reduce eddies generated during the flow of the airflow and reduce noise generated by the airflow. The plurality of bent portions may straighten the airflow flowing in the first direction multiple times, thereby successively reducing the noise of the airflow during the flow and achieving obvious flow-straightening and noise-reducing effects.

Description

fairing, fan structure and duct structure

[0001] This disclosure claims priority to Chinese Patent Application No. 202520279341.0, filed on February 20, 2025, entitled "Fairing, Fan Structure and Duct Structure", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to a fairing, a fan structure, and a duct structure. Background Technology

[0003] Wind turbines, as a traditional type of fluid machinery, are widely used in various fields of economic development, such as energy engineering, and are used in products like photovoltaic inverters and energy storage devices. A shroud structure is typically installed on wind turbines to rectify the airflow and reduce noise; however, the shroud's effect on rectification and noise reduction is not always significant. Summary of the Invention

[0004] The following is an overview of the detailed description of this disclosure. This overview is not intended to limit the scope of the claims.

[0005] According to a first aspect of this disclosure, the fairing provided by this disclosure includes:

[0006] Multiple bends, with at least two bends nested together, and each bend is provided with a rectifier port;

[0007] In the first direction, the projections of at least two of the multiple bends overlap.

[0008] In some embodiments of this disclosure, in a first direction, the projections of the rectifier ports on at least two bends completely overlap.

[0009] In some embodiments of this disclosure, in a first direction, the projected portions of the rectifier ports on at least two bends overlap;

[0010] In some embodiments of this disclosure, in a first direction, the projections of the rectifier ports on at least two bends are completely offset.

[0011] In some embodiments of this disclosure, the fairing includes a central portion disposed between two adjacent bends, at least a portion of the central portion being a protruding structure, or at least a portion of the central portion being a recessed structure, or at least a portion of the central portion extending along a first direction.

[0012] In some embodiments of this disclosure, the middle portion extends along a first direction in any one of an arc shape, a wavy shape, and a straight line.

[0013] In some embodiments of this disclosure, the fairing is formed by alternating multiple first grilles and multiple second grilles. The multiple first grilles are arranged radially at intervals around a central axis, and the second grilles are all arranged circumferentially around the central axis and connected to the multiple first grilles. The multiple first grilles and multiple second grilles interweave to form multiple rectifier ports.

[0014] In some embodiments of this disclosure, the surface of the first grille and / or the second grille is provided with a noise reduction structure, which is any one of a serrated structure, a raised structure, or a groove structure.

[0015] In some embodiments of this disclosure, the angle between the first side of each first grille facing the adjacent first grille and the horizontal plane is α, satisfying: 0° < α < 90°.

[0016] In some embodiments of this disclosure, the height of the vertices on the first grid gradually decreases or gradually increases along a direction perpendicular to the central axis X.

[0017] In some embodiments of this disclosure, the second grille has two second side surfaces arranged opposite to each other along a direction parallel to the central axis, and the angle between the second side surface and the horizontal plane is b, satisfying: 0° < b < 90°.

[0018] In some embodiments of this disclosure, the fairing has an opening, the fairing includes a protective portion disposed at the opening, and the protective portion has a through hole communicating with the opening.

[0019] According to a second aspect of this disclosure, a wind turbine structure is provided, comprising:

[0020] Fan body;

[0021] The base is located on one side of the fan body;

[0022] As in any of the first aspects, the fairing is located on the side of the base away from the fan body.

[0023] In some embodiments of this disclosure, the starting end of the fairing extends away from the direction of the fan body, and the ending end of the fairing extends toward the direction of the fan body.

[0024] In some embodiments of this disclosure, the starting end of the fairing extends toward the fan body, and the ending end of the fairing extends away from the fan body.

[0025] According to a third aspect of this disclosure, this disclosure provides a duct structure, including a duct housing and a fan structure as described in any of the second aspects;

[0026] The air duct casing has a fan mounting port; the fan structure is installed on the fan mounting port.

[0027] In some embodiments of this disclosure, the fan mounting port is located in the middle of the duct housing;

[0028] An air inlet or outlet is provided at the end of the duct housing away from the fan installation port.

[0029] Other features and advantages of this disclosure will be described in detail in the following detailed description section.

[0030] Brief description of the attached figures

[0031] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 is a perspective view of the fairing provided in an embodiment of this disclosure;

[0033] Figure 2 is a top view of the fairing structure provided in the embodiment of this disclosure, wherein the fairing is a circular structure;

[0034] Figure 3 is a top view of the fairing structure provided in the embodiment of this disclosure, wherein the fairing has a square structure;

[0035] Figure 4 is a top view of the fairing structure provided in the embodiment of this disclosure, wherein the fairing is a C-shaped structure;

[0036] Figure 5 is a schematic diagram of the structure of the fairing provided in the embodiment of this disclosure, in which the bent portion is not directly connected;

[0037] Figure 6 is a schematic diagram of the structure of the fairing provided in the embodiment of this disclosure, which has a generally sawtooth cross-section;

[0038] Figure 7 is a perspective view of the fairing provided in an embodiment of the present disclosure, wherein the middle part of the fairing is at least partially convex.

[0039] Figure 8 is a perspective view of the fairing provided in an embodiment of the present disclosure, wherein the middle part of the fairing is at least partially recessed.

[0040] Figure 9 is a perspective view of the fairing provided in an embodiment of the present disclosure, wherein the first grille and the second grille are staggered to form the fairing, and the first grille has a transition section;

[0041] Figure 10 is a schematic diagram showing that the transition section on the first grille provided in the embodiment of this disclosure is a straight structure;

[0042] Figure 11 is a schematic diagram of a raised arc-shaped transition section on the first grille provided in an embodiment of this disclosure;

[0043] Figure 12 is a schematic diagram of the first grille provided in this embodiment of the present disclosure, which has a concave arc-shaped transition section;

[0044] Figure 13 is a schematic diagram showing that the transition section on the first grille provided in the embodiment of this disclosure has a wavy structure;

[0045] Figure 14 is a schematic diagram of a noise reduction structure provided on a fairing according to an embodiment of the present disclosure;

[0046] Figure 15 is a perspective view of the first grille provided in an embodiment of the present disclosure, wherein a noise reduction structure is provided on the first grille;

[0047] Figure 16 is a perspective view of the fairing provided in an embodiment of the present disclosure, wherein the first grille on the fairing is inclined;

[0048] Figure 17 is a partial structural schematic diagram of the fairing provided in an embodiment of this disclosure;

[0049] Figure 18 is a perspective view of the fairing provided in an embodiment of the present disclosure, wherein the second grille on the fairing is inclined;

[0050] Figure 19 is a schematic diagram of the distance from the vertex of the first grille to the reference surface provided in an embodiment of this disclosure;

[0051] Figure 20 is a structural schematic diagram of the second grille and the horizontal plane provided in an embodiment of this disclosure;

[0052] Figure 21 is a perspective view of the fairing provided in an embodiment of the present disclosure, wherein a protective part is provided on the fairing;

[0053] Figure 22 is a perspective view of the fan structure provided in the embodiment of this disclosure;

[0054] Figure 23 is a structural schematic diagram of the starting end and the ending end of the fairing provided in the embodiment of this disclosure, wherein the starting end extends away from the fan body and the ending end extends toward the fan body.

[0055] Figure 24 is a structural schematic diagram of the starting end and the ending end of the fairing provided in the embodiment of this disclosure, wherein the starting end extends toward the fan body and the ending end extends away from the fan body.

[0056] Figure 25 is a schematic diagram of the air duct structure provided in the embodiment of this disclosure, wherein the two ends of the air duct shell are air inlets;

[0057] Figure 26 is a schematic diagram of the air duct structure provided in the embodiment of this disclosure, wherein the two ends of the air duct shell are air outlets.

[0058] Explanation of reference numerals in the attached figures:

[0059] 10-Base; 20-Fairing; 21-Fairing port; 22-Middle section; 23-Bending section; 24-First grille; 241-First section; 242-Transition section; 243-Second section; 244-First side; 25-Second grille; 251-Second side; 26-Noise reduction structure; 27-Opening; 28-Protective section; 281-Through hole; 29-Connecting structure; 30-Fan body; 40-Duct housing; 41-Fan mounting port; 50-Starting end; 60-Ending end; X-Central axis; Y-First direction. Embodiments of the present invention

[0060] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0061] In the description of this disclosure, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this disclosure, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise expressly specified.

[0062] As an introduction to the embodiments of this disclosure, a shroud installed on a fan is introduced. Fans, as a traditional type of fluid machinery, are widely used in various sectors of the national economy, such as energy engineering, and in products like photovoltaic inverters and energy storage devices. To meet heat dissipation requirements, high-speed operation and simultaneous operation of multiple fans are often employed, inevitably leading to significant noise pollution and even affecting people's physical and mental health. With the continuous optimization of motor and mechanical noise, aerodynamic noise has become the main noise source for axial flow fans. According to the aerodynamic generation mechanism, fan aerodynamic noise is mainly divided into discrete noise and broadband noise. Discrete noise is generated by the blades striking the surrounding gas medium during high-speed rotation, causing pressure pulsations in the surrounding gas. Broadband noise is mainly due to eddy current noise generated by pressure pulsations in the airflow caused by the turbulent boundary layer of the blades and its shedding. Through research on the aerodynamic noise characteristics of fans in new energy equipment such as photovoltaic inverters, energy storage devices, and charging piles, discrete noise accounts for a high proportion of fan aerodynamic noise, mainly caused by the fundamental frequency and harmonics noise of the fan.

[0063] To reduce fan noise, a shroud can be installed on the fan. Traditional shrouds are generally horn-shaped air guides, which can rectify the airflow near the wall of the air guide, thus reducing noise. However, the noise reduction of the shroud is limited and the rectification effect is not good. Some shrouds have a grid-like structure with rectification ports, which can rectify more airflow. However, the airflow can only be rectified and reduced in noise through one rectification port, so the rectification and noise reduction effect is not obvious.

[0064] Referring to Figure 1, this embodiment of the present disclosure provides a fairing 20, which includes multiple bends 23, with at least two bends 23 sequentially nested together. Each bend 23 has a flow-guiding port 21. In the first direction Y, the projections of at least two of the multiple bends 23 overlap. Each bend 23 can be an annular structure, with each annular bend 23 having the same central axis X; that is, the multiple bends 23 can be arranged in a concentric circle structure (as shown in Figure 2). Each bend 23 can also be square (as shown in Figure 3), polygonal, or C-shaped (as shown in Figure 4), and the multiple bends 23 are sequentially distributed along the first direction Y. Adjacent bends 23 can be directly connected to each other; alternatively, they can be spaced apart and connected by a connecting structure 29 (as shown in Figure 5).

[0065] In the first direction Y, at least two of the multiple bends 23 are sequentially nested, meaning that, as shown in Figure 1, one bend 23 is located inside another bend 23. The structure of the bend 23 can be annular, square, polygonal, C-shaped, etc. The height of the two or more nested bends 23 is not limited; the height of each bend 23 is not limited. Adjacent or spaced bends 23 can have the same height or different heights (height refers to the distance from the top of the bend 23 to a reference plane perpendicular to the central axis X in the direction of the central axis X).

[0066] Each bend 23 is provided with a rectifier port 21. The number of rectifier ports 21 on each bend 23 can be one or more. Through the rectifier ports 21, the gas flowing through the rectifier shroud 20 can be guided. When the fan is working, the flowing gas can pass through the rectifier ports 21 on the bend 23 (the shape of the rectifier ports 21 is not limited, and can be polygonal, circular, elliptical, or irregular in shape, such as triangular, quadrilateral, or pentagonal). After the action of the rectifier ports 21, the large vortices originally formed by the gas can be transformed into smaller vortices, dispersing the energy of the airflow, reducing the generation of turbulence, and thus achieving the effect of noise reduction.

[0067] In the first direction Y, the projections of at least two of the multiple bends 23 overlap. When the airflow flows along the first direction Y, it can pass through at least two bends 23 in sequence. The surface of the bend 23 is generally an arc-shaped surface, which can rectify the airflow. Each time the airflow passes through a bend 23, it will be rectified by that bend 23 to reduce the eddies generated during the gas flow and reduce the noise generated by the airflow. During the flow, the airflow will pass through two or more bends 23. Multiple bends 23 can rectify the airflow flowing along the first direction Y multiple times, thereby successively reducing the noise of the airflow during the flow. The rectification and noise reduction effects are obvious.

[0068] The surface of the bending part 23 is generally set as an arc-shaped structure (as shown in Figure 1), or it can be set as a planar structure. When it is set as a planar structure, multiple bending parts 23 are nested in sequence, and the vertical cross-sectional structure of the fairing formed is a sawtooth structure (as shown in Figure 6).

[0069] Referring to Figure 1, as one embodiment of this disclosure, in the first direction Y, the projections of the rectifier ports 21 on at least two bends 23 completely overlap. Alternatively, in the first direction Y, the projections of the rectifier ports 21 on at least two bends 23 partially overlap. Alternatively, in the first direction Y, the projections of the rectifier ports 21 on at least two bends 23 are completely offset.

[0070] In the first direction Y, each bend 23 has a rectifier port 21 with a projection (located on a plane perpendicular to the first direction Y). Among the multiple bends 23, at least two bends 23 have overlapping projections of rectifier ports 21. This overlap can be partial or complete (partial overlap can mean that the projections of one rectifier port 21 on one bend 23 and another on another bend 23 partially overlap, or that the projections of M rectifier ports 21 on one bend 23 and N rectifier ports 21 on another bend 23 partially overlap). The overlapping portions of the rectifier ports 21 in the first direction Y allow airflow to pass directly through at least two bends 23 with overlapping portions during its flow along the first direction Y. By passing through the rectifier ports 21 on at least two bends 23, the multiple rectifier ports 21 rectify the airflow, allowing for multiple rectifications of the flowing air, thereby gradually reducing noise during the flow process. At the same time, there is no need to change the direction of airflow, so that the airflow can maintain a certain flow rate and the airflow passes through the fairing 20 with high efficiency.

[0071] For multiple bends 23, the projections of the rectifier ports 21 in two or more bends 23 can be completely staggered. This allows the airflow to collide with the solid position of another bend 23 on the flow path after passing through the rectifier port 21 on one of the bends 23 when it flows along the first direction Y. This weakens the airflow velocity, reduces the eddies generated during gas flow, and lowers the energy of the airflow, thereby achieving noise reduction.

[0072] Please refer to Figures 1, 7 and 8. As an embodiment of this disclosure, the fairing 20 includes a middle portion 22 disposed between two adjacent bends 23. At least a portion of the middle portion 22 is a protruding structure, or at least a portion of the middle portion 22 is a recessed structure, or at least a portion of the middle portion 22 extends along a first direction Y.

[0073] A central section 22 is also provided on the fairing 20. The central section 22 connects two adjacent bends 23 distributed along the first direction Y, thereby connecting the two bends 23. A rectifier port 21 can also be provided on the central section 22, allowing some airflow to be rectified and noise reduced through the rectifier port 21 on the central section 22. As shown in Figure 7, at least a portion of the central section 22 is convex along the direction of the central axis X, or, as shown in Figure 8, at least a portion of the central section 22 is concave along the direction of the central axis X (the convexity refers to a more protruding portion of the central section 22 relative to the two bends 23 on both sides, while the concave portion refers to a more concave portion of the central section 22 relative to the two bends 23 on both sides). The central section 22, which is convex or concave along the direction of the central axis X, can increase the flow area of ​​the fairing 20, allowing it to contact more airflow, increasing the rectification range of the airflow, and achieving a better rectification and noise reduction effect. The rectifier ports 21 can be located on the two protruding sides or the two recessed sides of the middle part 22, so that the airflow flowing in the first direction Y can pass through at least two rectifier ports 21 on the middle part 22, thereby achieving the effect of rectifying and reducing noise in this part of the airflow.

[0074] At least a portion of the intermediate section 22 can also extend along the first direction Y, meaning the intermediate section 22 is configured as a planar structure to connect the two bent sections 23 (as shown in Figure 1). At least one rectifier port 21 is provided on the intermediate section 22. The orientation of the rectifier port 21 can intersect the first direction Y, and the orientation of the rectifier port 21 can be along the direction of the central axis X, or it can be inclined to the direction of the central axis X. This facilitates the passage of airflow in other directions (other directions different from the first direction Y), and achieves a rectification and noise reduction effect on the airflow in other directions.

[0075] Please refer to Figures 1, 7 and 8. As one embodiment of this disclosure, the middle portion 22 extends along the first direction Y in any one of the following shapes: arc, wave, and straight.

[0076] In the first direction Y, the middle portion 22 can extend in an arc shape, meaning that the middle portion 22 is either protruding or recessed along the direction of the central axis X, thus forming an arc shape. The middle portion 22 can also extend in a wave-like structure, meaning that the middle portion 22 has both protruding and recessed portions along the direction of the central axis X, with the protruding and recessed portions connected sequentially along the first direction Y, thus forming a wave-like structure. The middle portion 22 can also extend in a straight line, that is, extend along a certain plane. All these extension structures of the middle portion 22 can increase the area of ​​the fairing 20, allowing more airflow to pass through the fairing 20 for rectification, thereby improving the efficiency of rectification and noise reduction.

[0077] Please refer to Figure 9. As an embodiment of this disclosure, the fairing 20 is formed by a plurality of first grilles 24 and a plurality of second grilles 25 in an alternating manner. The plurality of first grilles 24 are arranged radially at intervals around the central axis X, and the plurality of second grilles 25 are all arranged circumferentially around the central axis X and connected to the plurality of first grilles 24. The plurality of first grilles 24 and the plurality of second grilles 25 are interwoven to form a plurality of rectifier ports 21.

[0078] The first grille 24 includes a first section 241, a transition section 242, and a second section 243 connected in sequence. A plurality of second grilles 25 are connected to a plurality of first sections 241 and a plurality of second sections 243 to form a plurality of bends 23. A plurality of second grilles 25 are connected to a plurality of transition sections 242 to form an intermediate section 22.

[0079] The first grille 24 may also include only the first segment 241 and the second segment 243 connected in sequence, and multiple second grilles 25 are connected to multiple first segments 241 and multiple second segments 243 to form multiple bends 23.

[0080] The fairing 20 is mainly a mesh structure formed by multiple first grilles 24 and multiple second grilles 25 interlaced. The first grilles 24 are strip-shaped structures, arranged radially around the central axis X, and spaced apart from each other. Each second grille 25 is an annular structure and connected to multiple first grilles 24, with each second grille 25 extending circumferentially around the central axis X. The inner diameter of each second grille 25 is different. Multiple second grilles 25 radiate outward from the central axis X, allowing the multiple second grilles 25 and multiple first grilles 24 to interweave and connect, forming multiple evenly distributed rectification ports 21, which can uniformly rectify the gas.

[0081] The first grille 24 can be composed of a first segment 241, a transition segment 242, and a second segment 243 connected sequentially. Multiple first segments 241 connected to multiple second grilles 25, and multiple second segments 243 connected to multiple second grilles 25, can form the aforementioned bend 23. Multiple second grilles 25 connected to multiple transition segments 242 can form the aforementioned intermediate portion 22. The second segment 243 has a specific bending direction, such that the second segment 243 overlaps with the first segment 241 in the first direction Y. When gas flows along the first direction Y, it can pass through the rectifier port 21 formed by the first segment 241 and the second grille 25, or through the rectifier port 21 formed by the second segment 243 and the second grille 25. Passing through multiple rectifier ports 21 achieves multiple rectifications, improving the noise reduction effect. A transition section 242 connects the first section 241 and the second section 243. The transition section 242 is generally a straight structure (as shown in Figure 10). The transition section 242 increases the surface area of ​​the fairing 20, allowing more gas to contact the surface of the fairing 20. At the contact point, the gas velocity decreases, achieving a rectification effect. The transition section 242 increases the rectification area of ​​the fairing 20, resulting in better noise reduction.

[0082] The transition section 242 can be configured as an arc-shaped structure (as shown in Figures 11 and 12, the transition section 242 can be convex upwards or concave downwards). With its length remaining constant along the first direction Y, the arc-shaped structure has a larger surface area, which can further increase the contact area between the transition section 242 and the gas. This allows the transition section 242 and the multiple second grilles 25 connected to it to rectify more gas, resulting in better noise reduction. The transition section 242 can also be configured as a wave shape (as shown in Figure 13) and extend towards the central axis X. In other words, while keeping the length along the first direction Y constant, the wavy structure has a larger surface area, increasing the contact area between the transition section 242 and the airflow. This allows the transition section 242 and the multiple second grilles 25 connected to it to rectify more gas. Furthermore, because the wavy transition section 242 extends towards the central axis X, it has overlapping areas along the first direction Y. These overlapping areas connect with the multiple second grilles 25, forming multiple rectification ports 21. When the gas flows in a direction perpendicular to the central axis X, it can sequentially pass through the multiple rectification ports 21 formed by the transition section 242 and the second grilles 25, increasing the number of rectification ports 21 through which the gas passes. This further improves the multi-stage rectification and noise reduction effect of the fairing, significantly enhancing the control of aerodynamic noise.

[0083] The first grille 24 may also include only the first segment 241 and the second segment 243 connected in sequence. Multiple second grilles 25 are connected to multiple first segments 241 and multiple second segments 243 to form multiple bends 23. The structure of the first grille 24 can be set according to requirements.

[0084] Please refer to Figures 14 and 15. As an embodiment of this disclosure, the surfaces of the first grille 24 and the second grille 25 may be provided with a noise reduction structure 26, which may be any one of a serrated structure, a raised structure, or a grooved structure.

[0085] Multiple noise reduction structures 26 can be provided on the first grille 24 or the second grille 25, or multiple noise reduction structures 26 can be provided on both the first grille 24 and the second grille 25 simultaneously. The noise reduction structures 26 can be located on any one or more sides of the first grille 24 and the second grille 25. The noise reduction structures 26 can further reduce the noise generated by the gas and the shroud 20. The noise reduction structures 26 can be any one of the following: sawtooth structure, protrusion structure, and groove structure. By setting these structures, the large vortices generated on the surface of the first grille 24 and the second grille 25 can be transformed into smaller vortices, thereby reducing the vortex noise generated by the high-speed rotation of the fan and achieving the effect of noise reduction.

[0086] Please refer to Figures 16 and 17. As an embodiment of this disclosure, the angle between the first side 244 of each first grille 24 facing the adjacent first grille 24 and the horizontal plane is α, which satisfies: 0° < α < 90°.

[0087] The first grille 24 can be set in an inclined state, that is, the angle α between the first side 244 of the first grille 24 and the horizontal plane is in the range of 0° < α < 90°; or, the first grille 24 is set in a circumferential spiral inclined position along the shroud 20, with an inclination angle of α, 0° < α < 90°. The inclined setting of the first grille 24 can further adapt to the direction of fan rotation. The inclined first grille 24 can change the path and speed of airflow, thereby reducing friction and vibration between the airflow and the shroud 20, reducing noise generation, and contributing to a quieter working environment. At the same time, the inclined setting of the first grille 24 changes the direction and speed of airflow, helping to optimize the airflow of the fan, making the fan's intake and exhaust smoother, improving the fan's efficiency and performance, while reducing energy loss.

[0088] Please refer to Figures 18 and 19. As one embodiment of this disclosure, the height of the vertices on the first grid 24 gradually decreases or gradually increases along a direction perpendicular to the central axis X.

[0089] As the first grille 24 extends, it reaches its highest point, i.e., a vertex. The plane containing the bottom of the fairing 20 is defined as the reference plane S, and the distance from the highest point of the first grille 24 to the reference plane is the height h of the vertex (as shown in Figure 19). Along a direction perpendicular to the central axis X, the height h of the vertices of the multiple first grilles 24 on the fairing 20 gradually decreases or increases. This facilitates setting the top surface of the fairing 20 as an inclined surface, allowing the fairing 20 to rectify the flow in the inclined direction according to the requirements of the operating conditions, thus better meeting user needs. The angle of inclination can also be set as needed by adjusting the height difference between the multiple first grilles 24.

[0090] Please refer to Figures 18 and 20. As an embodiment of this disclosure, the second grille 25 has two opposite second side surfaces 251 arranged in a direction parallel to the central axis X. The angle between the second side surface 251 and the horizontal plane is b, which satisfies: 0° < b < 90°.

[0091] The second grille 25 has two opposing second sides 251 along a direction parallel to the central axis X. These two opposing second sides 251 can be considered parallel to each other. The angle between the second side 251 and the horizontal plane is b, satisfying: 0° < b < 90°. In other words, the second grille 25 is also tilted, facilitating the overall tilting of the fairing 20. Depending on the operating conditions, the fairing 20 can be oriented in a specific direction to rectify the airflow in that direction, achieving noise reduction and better meeting usage requirements. The tilt angle can also be set as needed by adjusting the tilt angle of the second grille 25.

[0092] Please refer to Figure 21. As an embodiment of this disclosure, the fairing 20 has an opening 27 and includes a protective portion 28 disposed at the opening 27. The protective portion 28 has a through hole 281 communicating with the opening 27.

[0093] The opening 27 is for facilitating gas flow. The opening 27 can be circular, elliptical, rectangular, polygonal, or other irregular shapes. A protective section 28 can be installed inside the opening 27 to prevent debris from entering the fan and to prevent accidental hand contact that could cause injury. The protective section 28 can be a mesh or grid structure, with through holes 281 communicating with the opening 27. Multiple through holes 281 can be provided, and their shapes can be circular, elliptical, rectangular, polygonal, or other irregular shapes to facilitate gas flow and reduce obstruction by the protective section 28.

[0094] Please refer to Figure 22. A fan structure in one embodiment of this disclosure includes a fan body 30, a base 10, and the aforementioned shroud 20. The base 10 is disposed on one side of the fan body 30, and the shroud 20 is disposed on the side of the base 10 opposite to the fan body 30.

[0095] The fairing 20 can be mounted on the base 10 by bolts or welding. The base 10 is then mounted on the fan body 30 using bolts, clips, or other connecting structures. The fan body 30 and the fairing 20 are located on opposite sides of the base 10, facilitating the connection between the fairing 20 and the fan body 30 via the base 10. A fan is installed inside the fan body 30. The fan's rotation allows external air to enter the fan body 30 through the fairing 20, or allows air inside the fan body 30 to be discharged to the outside through the fairing 20. The fairing 20 can be circular, square, polygonal, elliptical, or other shapes, and the base 10 can also be circular, square, polygonal, elliptical, or other shapes to accommodate the fairing 20.

[0096] Please refer to Figures 22, 23, and 24. In one embodiment of this disclosure, the starting end 50 of the fairing 20 extends away from the fan body 30, and the ending end 60 of the fairing 20 extends towards the fan body 30 (as shown in Figure 23). Alternatively, the starting end 50 of the fairing 20 extends towards the fan body 30, and the ending end 60 of the fairing 20 extends away from the fan body 30 (as shown in Figure 24).

[0097] The outermost edge of the shroud 20 is the starting end 50, which can be connected to the base 10. The innermost edge is the ending end 60. The starting end 50 can extend away from the fan body 30 and towards the central axis X, so that the starting end 50 has a convex structure at its position. The angle between the extension direction of the starting end 50 and the horizontal direction is not limited. The ending end 60 of the shroud 20 extends towards the fan body 30, so that the shroud 20 has a concave structure at its position. This facilitates the partial overlap of the projections of at least two parts on the shroud 20 in the first direction Y, allowing airflow along the first direction Y to pass through these at least two parts. This allows for at least two rectifications of the airflow, increasing the number of rectifications and improving the rectification and noise reduction effect. Similarly, extending the starting end 50 of the shunting cover 20 toward the fan body 30, making the starting end 50 have a concave structure, and extending the ending end 60 of the shunting cover 20 away from the fan body 30, making the ending end 60 have a convex structure, also helps to partially overlap the projections of at least two parts on the shunting cover 20 in the first direction Y, so that the airflow along the first direction Y can pass through the at least two parts, and the airflow can be rectified at least twice, increasing the number of rectifications and improving the rectification and noise reduction effect.

[0098] Please refer to Figures 25 and 26. An embodiment of this disclosure provides a duct structure, including a duct housing 40 and the aforementioned fan structure.

[0099] A fan mounting port 41 is provided on the air duct housing 40; the fan structure is set on the fan mounting port 41.

[0100] Airflow can circulate within the duct housing 40 of the duct structure. A fan mounting port 41 is provided on the duct housing 40, allowing the fan structure to be installed at the location of the fan mounting port 41. The shunting shield 20 on the fan structure at least partially penetrates the fan mounting port 41 and is embedded inside the duct housing 40. When airflow from inside the duct housing 40 enters the interior of the fan structure, or when airflow from the fan structure enters the interior of the duct housing 40, it passes through the shunting shield 20 on the fan structure, thereby achieving the effect of airflow rectification and noise reduction.

[0101] Please refer to Figures 25 and 26. As one embodiment of this disclosure, the fan mounting port 41 is located in the middle of the duct housing 40. An air inlet or an air outlet is provided at the end of the duct housing 40 away from the fan mounting port 41.

[0102] The fan mounting port 41 can be located in the middle of the duct housing 40, and the fan structure can also be located in the middle of the duct housing 40. One end of the duct housing 40 can be designated as an air inlet or outlet, or both ends can be designated as air inlets or outlets. If the airflow, as shown in Figure 24, enters from the air inlets at both ends of the duct housing 40, passes through the rectifier 20, and exits from the bottom of the fan body 30, the airflow velocity is relatively low due to the fan structure being located in the middle of the duct housing 40, resulting in less noise. If the airflow, as shown in Figure 25, enters from the bottom of the fan body 30 and exits from both ends of the duct housing 40, the airflow takes longer to reach the outlets at both ends of the duct housing 40 due to the fan structure being located in the middle, and the velocity is lower, resulting in less noise during airflow exit, thus also achieving a noise reduction effect.

[0103] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0104] The fairing, fan structure, and duct structure provided in the embodiments of this disclosure have been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this disclosure. The descriptions of the above embodiments are only for the purpose of helping to understand the technical solutions and core ideas of this disclosure. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A fairing, the fairing comprising: Multiple bends, at least two of which are nested together in sequence, and each bend is provided with a flow rectifier port; In the first direction, the projections of at least two of the plurality of bends overlap.

2. The fairing according to claim 1, wherein, In the first direction, the projections of the rectifier ports on at least two of the bends completely overlap.

3. The fairing according to claim 1, wherein, In the first direction, the projected portions of the rectifier ports on at least two of the bends overlap.

4. The fairing according to claim 1, wherein, In the first direction, the projections of the rectifier ports on at least two of the bends are completely offset.

5. The fairing according to claim 1, wherein, The fairing includes a central portion disposed between two adjacent bends. At least a portion of the central portion is a protruding structure, or at least a portion of the central portion is a recessed structure, or at least a portion of the central portion extends along the first direction Y.

6. The fairing according to claim 5, wherein, Along the first direction Y, the middle portion extends in any one of the following shapes: arc, wave, and straight line.

7. The fairing according to claim 5, wherein, The fairing is formed by multiple first grilles and multiple second grilles in an alternating manner. The multiple first grilles are arranged radially at intervals around the central axis X. The second grilles are all arranged circumferentially around the central axis X and connected to the multiple first grilles. The multiple first grilles and multiple second grilles interweave to form multiple fairing ports.

8. The fairing according to claim 7, wherein, The surface of the first grille and / or the second grille is provided with a noise reduction structure, which is any one of a sawtooth structure, a raised structure, or a groove structure.

9. The fairing according to claim 7, wherein, The angle between the first side of each of the first grilles facing the adjacent first grille and the horizontal plane is α, which satisfies: 0° < α < 90°.

10. The fairing according to claim 7, wherein, Along a direction perpendicular to the central axis X, the height of the vertices on the first grid gradually decreases or gradually increases.

11. The fairing according to claim 7, wherein, The second grille has two opposite sides arranged in a direction parallel to the central axis X, and the angle between the second side and the horizontal plane is b, satisfying: 0° < b < 90°.

12. The fairing according to claim 1, wherein, The fairing has an opening, and the fairing includes a protective part disposed at the opening, the protective part having a through hole communicating with the opening.

13. A fan structure, the fan structure comprising: Fan body; A base is located on one side of the fan body; The fairing as described in any one of claims 1 to 12, wherein the fairing is disposed on the side of the base opposite to the fan body.

14. The fan structure according to claim 13, wherein, The starting end of the fairing extends away from the direction of the fan body, and the ending end of the fairing extends towards the direction of the fan body.

15. The fan structure according to claim 13, wherein, The starting end of the fairing extends toward the wind turbine body, and the ending end of the fairing extends away from the wind turbine body.

16. A duct structure, the duct structure comprising a duct shell and a fan structure as described in any one of claims 13 to 15; The air duct housing has a fan mounting port; the fan structure is installed on the fan mounting port.

17. The air duct structure according to claim 16, wherein, The fan mounting port is located in the middle of the air duct housing; The end of the duct housing away from the fan mounting port is provided with an air inlet or an air outlet.

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