Fairing, fan assembly and air duct system

Abstract

The utility model provides a fairing, a fan assembly and an air duct system, the fairing comprises a fairing body, and the fairing body comprises a plurality of outer cover grilles distributed at intervals in a surrounding mode; the outer cover grating forms a plurality of arc-shaped bent cover sections which are sequentially connected in the extending direction of the fairing, and the bending directions of any two adjacent arc-shaped bent cover sections in the at least two arc-shaped bent cover sections which are sequentially connected are opposite. According to the technical scheme provided by the utility model, the bending directions of any two adjacent arc-shaped bending sections are opposite, so that the fairing can be suitable for noise reduction scenes of different incoming air flows and can be used for rectifying and transitioning the air flows in different directions, the applicability of the fairing is improved, and meanwhile, the fairing can be used for reducing noise. By means of the arrangement, the situation that in the prior art, the bending directions of multiple layers of air deflectors are the same, vortexes are easily generated when air flow passes through, and secondary turbulent flow noise is formed is avoided, and the noise reduction effect on the air flow is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a heat dissipation fan technical field, specifically, relates to a fairing, fan assembly and air duct system. BACKGROUND

[0002] Fan as a kind of fluid machinery widely used in energy engineering and multiple fields, high speed or multiple fan simultaneous working mode is often used, this working mode can bring more serious noise pollution, affect people's comfort. Among them, aerodynamic noise as the main noise source of fan, mainly divided into discrete noise and wideband noise, fan discrete noise is due to blade in high-speed rotation process, beat surrounding gas medium, causes surrounding gas pressure pulsation and generates. Fan wideband noise is mainly due to blade turbulent boundary layer and its shedding causes airflow pressure pulsation vortex noise generated. In order to reduce fan aerodynamic noise, the prior art proposes a fairing arranged on the fan shell, to realize noise reduction on the basis of guaranteeing the flow guiding effect of wind, such as the air outlet cover of outdoor unit of air conditioner and outdoor unit of air conditioner disclosed in patent No. CN201320231775, it is provided with multilayer air outlet cover with curved air deflector, when installing air outlet cover to outdoor unit, can guide fan air outlet using air deflector, and can reduce the pressure loss when air blows, improve air volume, reduce noise, improve outdoor unit performance.

[0003] However, the noise reduction effect of the existing fairing is general. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of fairing, fan assembly and air duct system to improve the noise reduction effect of fairing in prior art.

[0005] In order to realize the above-mentioned purpose, the utility model provides a kind of fairing, the fairing includes cover body, the cover body includes: multiple outer cover grating distributed in interval around;Outer cover grating forms multiple arc-shaped curved cover segments connected in sequence along the extension direction of the fairing, the bending direction of any adjacent two arc-shaped curved cover segments in at least two arc-shaped curved cover segments connected in sequence is opposite.

[0006] According to another aspect of the utility model, a kind of fan assembly is provided, and fan assembly includes unit and above-mentioned fairing, unit includes fan frame and fan arranged in fan frame, fan frame has opening along its axial direction both ends, fairing is set on one of openings, to flow through two openings and the wind flow of fan is fairing guiding.

[0007] According to the wind channel system, the fan assembly is arranged in the air guide channel, so that the fluid flowing through the air guide channel is rectified.

[0008] The technical scheme of the utility model provides a fairing, the fairing has an extension direction, the fairing includes a cover body, the cover body has a plurality of fairing ports distributed on the surface of the cover body and a plurality of arc-shaped curved cover segments connected in sequence along the extension direction of the fairing, the fairing ports are used to guide the airflow flowing through the cover body, and the bending directions of any two adjacent arc-shaped curved cover segments are opposite.

[0009] By adopting the scheme, the bending directions of any two adjacent arc-shaped curved segments are opposite, so that the fairing can be applicable to different noise reduction scenes of airflow and can rectify and transition the airflow in different directions, the applicability of the fairing is improved, meanwhile, the scheme avoids the situation that the bending directions of the multiple layers of air guide plates are all the same in the related art, the airflow is easy to generate vortex and form secondary turbulence noise when passing through, and the noise reduction effect on the airflow is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0010] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the description of the exemplary embodiments of the present application, serve to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0011] Figure 1 A structure schematic view of the fan assembly provided by the embodiment one of the utility model is shown;

[0012] Figure 2 An explosion view of the fan assembly of Figure 1 is shown;

[0013] Figure 3 A structure schematic view of the outer cover grid and the adapter seat of the fairing in Figure 1 is shown;

[0014] Figure 3a A structure schematic view of one of the arc-shaped curved cover segments in Figure 3 is shown;

[0015] Figure 3b Different line type structure schematic views of one of the arc-shaped curved segments in Figure 3 are shown;

[0016] Figure 3c Another structure schematic view of the fairing in Figure 3 is shown;

[0017] Figure 4 It shows Figure 3 A schematic diagram of the structure of one of the curved sections;

[0018] Figure 5 It shows Figure 1 Assembly diagram of the annular grid of the central fairing and the outer shroud grid;

[0019] Figure 6 It shows Figure 1 A schematic diagram illustrating the application of wind turbine components;

[0020] Figure 7 A schematic diagram of the structure of the fan assembly provided in Embodiment 2 of this utility model is shown;

[0021] Figure 8 It shows Figure 7 A schematic diagram of the structure of the outer grille and adapter of the central fairing;

[0022] Figure 9 A schematic diagram of the structure of the fan assembly provided in Embodiment 3 of this utility model is shown.

[0023] Figure 10 A schematic diagram of the structure of the fan assembly provided in Embodiment 4 of this utility model is shown;

[0024] Figure 11 It shows Figure 9 Side view of the center fairing;

[0025] Figure 12 A schematic diagram of the structure of the fan assembly provided in Embodiment 5 of this utility model is shown;

[0026] Figure 13 It shows Figure 12 Top view of the fairing;

[0027] Figure 14 An exploded view of a fan assembly provided in another embodiment of the present invention is shown;

[0028] Figure 15 It shows Figure 1 A comparison of the sound pressure levels of the fairing of the fan assembly under different D conditions;

[0029] Figure 16 This illustrates a reference fairing that already exists in the prior art;

[0030] Figure 17 Show Figure 16 A sectional view;

[0031] Figure 18 It shows Figure 16 Reference fairing and Figure 1total sound pressure level of the fairing in the graph.

[0032] wherein the above figures include the following reference signs:

[0033] 10, fairing; 11, adapter; 111, seat body; 112, pipe body; 12, cover body; 1201, top opening; 1202, fairing opening; 1203, bottom opening; 1204, layered surface; 121, cover grid; 1211, arc-shaped curved section; 12111, first end; 12112, second end; 1212, adapter section; 122, top grid; 123, ring-shaped grid;

[0034] 20, unit; 21, fan frame; 22, fan;

[0035] 30, air guide duct. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0037] As shown in the drawings, Figures 1 to 13 The embodiments of the present application provide a fairing 10, the fairing 10 has an extension direction, the fairing 10 includes a cover body 12, the cover body 12 has a plurality of fairing openings 1202 distributed on the surface of the cover body 12 and a plurality of arc-shaped curved cover sections 100 connected in sequence along the extension direction of the fairing 10, the fairing opening 1202 is used for guiding the airflow passing through the cover body 12, and the bending directions of any two adjacent arc-shaped curved cover sections 100 are opposite. It can be understood that the arc-shaped curved cover section 100 can be a surface concave conical ring structure surrounded circumferentially by a plurality of Figure 3 The arc-shaped curved cover section 1211 (the curved section located between the two dashed lines) connected with the right end of the adapter section 1212 in the drawings can be a surface concave conical ring structure surrounded circumferentially, and the arc-shaped curved cover section 1211 (the curved section located below the dashed line) connected with the left end of the adapter section 1212 in the drawings can be a surface convex conical ring structure surrounded circumferentially. Figure 3 The arc-shaped curved cover section 1211 (the curved section located between the two dashed lines) connected with the right end of the adapter section 1212 in the drawings can be a surface concave conical ring structure surrounded circumferentially, and the arc-shaped curved cover section 1211 (the curved section located below the dashed line) connected with the left end of the adapter section 1212 in the drawings can be a surface convex conical ring structure surrounded circumferentially.

[0038] For example, the fairing 10 is formed by a plurality of arc-shaped curved fairing segments 100 connected in sequence along the air inlet direction. Each arc-shaped curved fairing segment 100 is hollow and substantially cylindrical in shape, and the side surface thereof can be convex outwardly or inwardly. The convex directions of any two adjacent arc-shaped curved fairing segments 100 are opposite to each other. The overall shape is similar to that of a spring air chamber of a foot-pumped air cylinder. Further, in order to flexibly adjust the frequency spectrum or the amplitude of noise, the diameter of the fairing 10 can gradually decrease from one end to the other end, or the diameter can first decrease, then increase, and then decrease again, or the diameter can first increase, then decrease, and then increase again. The specific diameter change can be improved according to actual needs.

[0039] Further, as shown in Figures 1 to 13 , the cover body 12 is formed by a plurality of outer cover gratings 121 which are uniformly or non-uniformly spaced. The gaps between the outer cover gratings 121 form a plurality of fairing openings 1202. The cover body 12 in this embodiment is composed of a plurality of outer cover gratings 121 which are distributed in the circumferential direction and have a plurality of arc-shaped curved segments 1211, thereby prolonging the overall length of the cover body 12, increasing the fairing area, and facilitating the enhancement of the noise reduction effect. In actual applications, the shape of the fairing opening 1202 can be a regular polygon such as a triangle, a rectangle, a trapezoid, or a pentagon, or an ellipse, or a special shape. It can be understood that, for the sake of convenience, Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 8 are schematic cross-sectional views of the fairing in the axial cross section.

[0040] As can be seen from the opposite bending directions of any two adjacent arc-shaped curved fairing segments 100, the bending directions of any two adjacent arc-shaped curved segments 1211 in the same outer cover grating 121 are opposite to each other. The arc-shaped curved segment 1211 can be a smooth curved segment, which is beneficial to improving the fairing transition effect on the airflow and the applicability of the fairing 10. Alternatively, the arc-shaped curved segment 1211 can be a non-smooth curved segment. The two adjacent arc-shaped curved segments 1211 can be smoothly transitioned, for example, they can have a common tangent line. Further, the cover body 12 is composed of a plurality of arc-shaped curved segments 1211 which are circumferentially distributed and surrounded, thereby facilitating the up-and-down combination of a plurality of arc-shaped fairing segments and the circumferential combination of a plurality of arc-shaped curved segments 1211 of the same arc-shaped fairing segment, and improving the maintainability of the cover body 12.

[0041] In this embodiment, as shown in Figure 3aAs shown, the outer grille 121 includes multiple arc-shaped curved segments 1211 connected sequentially along the extension direction of the fairing 10. These multiple arc-shaped curved segments 1211 are used to form multiple arc-shaped curved cover segments 100, and the arc-shaped curved segments 1211 are smooth curved segments. For example, an array of the first arc-shaped curved segments 1211 (the curved segments below the two dashed lines) of several outer grilles 121 surrounds to form the first arc-shaped curved cover segment 101 in the lower dashed frame; an array of the second arc-shaped curved segments 1211 (the curved segments between the two dashed lines) of several outer grilles 121 surrounds to form the second arc-shaped curved cover segment 102 in the upper dashed frame, and so on. The first arc-shaped curved cover segment 100, the second arc-shaped curved cover segment 100, and the Nth arc-shaped curved cover segment 100 are sequentially stacked and connected along the air intake direction to form the cover body 12. Furthermore, the connection relationship between adjacent arc-shaped curved cover segments 100 can be a combined connection. It is understood that the curved cover section 100 includes: a first curved cover section 101 and a second curved cover section 102.

[0042] In this embodiment, the bending directions of any two adjacent arc-shaped curved sections 1211 are opposite, which makes the fairing 10 applicable to noise reduction scenarios with different incoming airflows and rectifys and transitions airflows in different directions, improving the applicability of the fairing 10. At the same time, this setting avoids the situation in the prior art where the bending directions of the multi-layer air guide plates are all the same, and the airflow is prone to generate eddies and form secondary turbulence noise when passing through, further improving the noise reduction effect on the airflow.

[0043] It is understandable that "more" in this implementation refers to two or more, and can be either odd or even.

[0044] On the other hand, such as Figure 3b In one embodiment shown, the smoothly curved arc segment 1211 is 1211a. The extension line of the arc segment 1211 on the plane along the extension direction of the fairing has two possible shapes: First, it can be a smooth curved segment 1211b composed of multiple segments of different slopes connected sequentially, forming an overall shape resembling a curved segment. In practical applications, these segments can be connected according to a sawtooth-like relative positional relationship. Second, the extension line can be a wavy line forming an overall shape resembling a curved segment, forming a smooth curved segment 1211c. This design is beneficial for ensuring the airflow rectification effect of the arc segment 1211 while also providing greater tolerance for process errors, reducing the processing difficulty of the arc segment 1211, and improving the fairing 12's ability to rectify airflow from different directions.

[0045] like Figure 3cAs shown, in another embodiment of the present application, the cover body 12 comprises two types of grilles: one is the outer cover grille 121 as described in the previous embodiment, and a directional grille 121a.

[0046] The directional grille 121a comprises one or more arc-shaped curved segments 1211a, 1211b extending along the extension direction of the fairing, which are sequentially connected end to end, and the length and curvature radius of the arc-shaped curved segments 1211a, 1211b can be the same as those of the arc-shaped curved segment 1211. The only difference is that the bending directions of the arc-shaped curved segments 1211a, 1211b used to form the directional grille 121a are the same, or at least two of them are the same. In actual application, the arc-shaped curved segment 1211a can also be composed of a plurality of straight line segments. Figure 3b

[0047] Further, the arc-shaped curved segments 1211a, 1211b can also be straight line segments, and the inclination directions of the arc-shaped curved segments 1211a, 1211b are the same, such as both being positive or both being negative. Or the inclination directions of at least two of the arc-shaped curved segments 1211a, 1211b used to form the directional grille 121a are the same, such as both being positive or both being negative.

[0048] In addition, the directional grille 121a is arranged in a spaced manner with the outer cover grille 121. Specifically, one or more outer cover grilles 121 can be arranged between two adjacent directional grilles 121a, or one or more outer cover grilles 121 can be arranged every several directional grilles 121a. The plurality of outer cover grilles 121 and one or more directional grilles 121a are arranged in a spaced manner to form the cover body 12.

[0049] By using the above-mentioned scheme of the present application, since the flow regulation, noise reduction and noise elimination effects of the directional grille 121a are inferior to those of the outer cover grille 121, but the processing difficulty of the directional grille 121a is less than that of the outer cover grille 121, and has certain cost advantage, therefore, by adjusting the arrangement position of the outer cover grille 121, the flow regulation, noise reduction and noise elimination effects of the fairing in some directions can be strengthened, for the directions with low flow regulation, noise reduction and noise elimination requirements, the directional grille 121a can be used, thereby realizing the reduction of the overall cost under the premise of ensuring the flow regulation, noise reduction and noise elimination effects of the fairing; directional noise enhancement or weakening can also be realized, thereby expanding the application scenarios of the fairing.

[0050] ​It should be noted that the combination of the plurality of arc-shaped curved segments 1211 for forming the same arc-shaped fairing segment and the combination of the plurality of arc-shaped curved segments 1211 of the same cover grid 121 for forming the plurality of arc-shaped curved segments 100 can be adjusted according to actual conditions. For example, in one embodiment not shown in the figure, the plurality of arc-shaped curved segments 1211 for forming the same arc-shaped fairing segment can be divided into two groups, one group of the plurality of arc-shaped curved segments 1211 is a smooth curved segment, and the other group of the plurality of arc-shaped curved segments 1211 is a quasi-smooth curved segment 1211b, and the plurality of smooth curved segments and the plurality of quasi-smooth curved segments 1211b are arranged alternately along the circumferential direction of the fairing 10. On the other hand, in another embodiment not shown in the figure, the plurality of arc-shaped curved segments 1211 of the same cover grid 121 for forming the plurality of arc-shaped curved segments 100 can be divided into two groups, one group of the plurality of arc-shaped curved segments 1211 is a smooth curved segment, and the other group of the plurality of arc-shaped curved segments 1211 is a quasi-smooth curved segment 1211b, and the plurality of smooth curved segments and the plurality of quasi-smooth curved segments 1211b are arranged alternately along the extension direction of the fairing 10 (for example, as shown in the figure). Figure 1

[0051] As shown in the figure, the cross-sectional shape of the cover grid 121 (the arc-shaped curved segment 1211) in the plane perpendicular to the length direction thereof includes one or a combination of a circle, a rectangle, a trapezoid, an ellipse, a D type, an H type, a C type, an L type, a ring, a star, etc., so as to improve the fairing effect of the cover body 12 on the wind flow.

[0052] As shown in the figures, Figure 3 , Figure 4 and Figure 8 , the plurality of arc-shaped curved segments 1211 are all smooth curved segments, and any one of the arc-shaped curved segments 1211 has a first end 12111 and a second end 12112, the radial straight line of the first end 12111 and the radial straight line of the second end 12112 intersect and form an included angle A, 0°<A≤90°; the difference between the bending angles of any two adjacent arc-shaped curved segments 1211 is D, 0°≤D<90°, wherein A includes A1 and A2, the bending angle of the first arc-shaped curved segment is A1, and the bending angle of the second arc-shaped curved segment is A2.

[0053] As shown in the figure, the arc-shaped curved segment 1211 in the embodiment is a circular arc segment with an arc-shaped bending center, and the line connecting the bending center and the first end 12111 is one of the radial directions of the arc-shaped curved segment 1211. Figure 4 As shown in the figure, the radial direction of the second end 12112 is the same.

[0054] ​In the embodiment, the angle A is limited to ensure the reliability of the extension of the outer cover grid 121 in the direction of the unit 20 towards the adapter 11, while facilitating the improvement of the rectification effect and noise reduction effect of the fairing 10, and the D is limited to further improve the noise reduction effect of the fairing 10.

[0055] Specifically, the number of the arc-shaped curved cover segments 100 in the embodiment is n, and the arc-shaped curved segments 1211 included in the outer cover grid 121 is also n segments, that is, the number of the arc-shaped curved segments 1211 included in the same outer cover grid 121 is equal to the number of the arc-shaped curved cover segments 100. The arc-shaped curved segments 1211 in the embodiment all adopt smooth curved segments. When n = 2, one of the structures of the fairing 10 is as shown in the embodiment one of Figures 1 to 5 In the embodiment one, the outer cover grid 121 includes a first arc-shaped curved segment and a second arc-shaped curved segment, wherein the curved convex of the first arc-shaped curved segment is directed away from the center line of the cover body 12, and the curved convex of the second arc-shaped curved segment is directed towards the center line of the cover body 12. When n = 3, one of the structures of the fairing 10 is as shown in the embodiment two of Figure 7 and Figure 8 In the embodiment two, the outer cover grid can further include a third arc-shaped curved segment, a fourth arc-shaped curved segment and a fifth arc-shaped curved segment, wherein the curved convex of the fourth arc-shaped curved segment is directed away from the center line of the cover body 12, and the curved convexes of the third arc-shaped curved segment and the fifth arc-shaped curved segment are the same and are directed towards the center line of the cover body 12.

[0056] In the embodiment one of Figures 1 to 5 A includes A1 and A2, the bending angle of the first arc-shaped curved segment is A1, the bending angle of the second arc-shaped curved segment is A2, and the difference D between the bending angles is |A1-A2|. In order to verify the noise reduction effect of the fairing 10 under different D, the fairing 10 with different D is analyzed, including: D = 0°, D = 30°, D = 60°, D = 90°, D = 120°, D = 150°. The fairing 10 is arranged at the air inlet of the unit, and then the total sound pressure level at the air inlet 1m of the fan is calculated by acoustic simulation, and the total sound pressure level values under different bending angle differences D are shown in the following table:

[0057]

[0058] From the above table and Figure 15It can be seen that the D of the fairing 10 in Embodiment One satisfies 0°≤△A<90°, and the fairing has strong rectification and noise reduction effects. Therefore, the D is limited in the above range. Similarly, in Embodiment Two, A includes A3, A4 and A5, the bending angle of the third arc-shaped bending segment is A3, the bending angle of the fourth arc-shaped bending segment is A4, the bending angle of the fifth arc-shaped bending segment is A5, the bending angle difference includes D1 and D2, D1=|A3-A4|, D2=|A4-A5|, and D1 and D2 are both between 0° and 90°, so as to ensure the rectification and noise reduction effects of any two adjacent arc-shaped bending segments.

[0059] It should be noted that the number of n, the bending direction of the arc-shaped bending segment 1211, and the selection of different D can be adjusted according to actual conditions, and examples are not given here.

[0060] As shown in Figure 10 and Figure 11 , the cover body 12 can be a hollow cylindrical structure in general, and the outer cover grid 121 formed by the arc-shaped bending segments 1211 connected in sequence can form a wind-permeable cylinder wall. In actual application, as shown in Figure 1 , the cover body 12 can also be a generally inverted funnel structure with a top smaller than a bottom. For ease of description, it is assumed that the extension direction of the fairing is parallel or coincides with the extension direction of the center line of the cylindrical cover, as shown in Figure 11 , the outer cover grid 121 gradually converges towards the center from the adapter 11, that is, each arc-shaped bending segment 1211 on the outer cover grid 121 extends in the direction along the center line of the cylindrical cover and also tilts towards the center line of the fairing. Further, in order to improve the noise reduction effect, the arc-shaped bending segment 1211 can also tilt spirally along the circumference of the fairing, and the acute angle formed by the tilting angle is B, 0°<B<90°, or the extension direction of the arc-shaped bending segment 1211 is parallel to the extension direction of the fairing. By applying this scheme, the cross-sectional shape of the airflow passing through the fairing port 1202 can be changed, the airflow resistance can be changed, the airflow velocity can be changed, the energy dissipation on the fairing during the gas flow process can be changed, and the noise reduction effect can be changed.

[0061] By setting in this way, the wind cover can be set and the flow guiding effect on the airflow can be adjusted according to actual conditions, and the rectification and noise reduction effects of the fairing 10 can be improved. In Figures 1 to 5 Embodiment One shown in Figure 7 Embodiment Two shown in Figure 8 and Figure 9 Embodiment Three shown in, the extension direction of the arc-shaped bending segment 1211 parallel to the extension direction of the fairing 10 can also be understood as B=90°, at this time, the tilt of the outer cover grid 121 only has an inward tilt, that is, a centripetal tilt. For example, in Figures 10 to 11In the shown embodiment four, 0° < B < 90°, the outer cover grids 121 are inclined both inwards and helically along the circumference of the fairing 10.

[0062] It should be noted that the extension direction of the center line of the cylindrical cover in this embodiment is also the extension direction of the axis of the cylindrical cover, and the extension direction of the fairing in this embodiment coincides with the extension direction of the center line of the cylindrical cover.

[0063] As shown in the figure, the cover body 12 has opposite top and bottom openings 1201 and 1203 along the extension direction of the fairing 10, wherein one end of the plurality of outer cover grids 121 surrounds the bottom opening 1203, and the end of the plurality of outer cover grids 121 away from the bottom opening 1203 surrounds the top opening 1201. In this way, the introduction and export of the airflow are facilitated, and the circulation at both ends of the cover body 12 is achieved through the arrangement of the top and bottom openings 1201 and 1203, which is beneficial to reduce the wind resistance noise. Figures 1 to 13

[0064] It can be understood that in another embodiment not shown in the figure, the fairing can only have one of the top opening 1201 or the bottom opening 1203, and the preferred embodiment is to have both the top opening 1201 and the bottom opening 1203, which can reduce wind resistance and improve noise reduction effect.

[0065] For example, in the embodiment of the utility model, the top of the fairing 10 can have a top opening 1201, for example, a planar panel, a planar grid, a curved grid or a curved panel is arranged at the top opening 1201, at this time, the edge of the planar panel, the planar grid, the curved grid or the curved panel is connected with the edge of the top opening 1201. At this time, the airflow enters the cover body 12 from the bottom of the fairing and is guided out through the flow port 1202, or the airflow enters the cover body 12 through the top opening 1201 and the flow port 1202 and is guided out from the bottom.

[0066] For example, the top opening 1201 can also not be arranged according to actual needs, and a planar panel, a planar grid, a curved grid or a curved panel is arranged at the top opening 1201, at this time, the edge of the planar panel, the planar grid, the curved grid or the curved panel is connected with the edge of the top opening 1201. That is, the fairing only has the bottom opening 1203, and the curvature of the curved grid used to cover or shield the top opening 1201 can be the same as the curvature of the fairing 10, such as using a curved grid with the same curvature as a curved section 1211 of the fairing 10, or the curvature of the curved grid used can be different from the curvature of the fairing 10, such as using a spherical grid. At this time, the airflow enters the cover body 12 from the bottom opening 1203 of the fairing and is guided out through the flow port 1202, or the airflow enters the cover body 12 through the flow port 1202 and is guided out from the bottom opening 1203. ​

[0067] For this embodiment, the extension direction of the fairing 10 is the center line direction of the cover 12 from the bottom opening 1203 to the top opening 1201. Since the cover 12 in this embodiment is a regular cylindrical structure, it can also be understood as the axial direction of the cover 12 from the bottom opening 1203 to the top opening 1201. It should be emphasized that the top opening 1201 and the bottom opening 1203 are optional, and the fairing 10 can not be provided with the top opening 1201 and the bottom opening 1203.

[0068] Specifically, at least one pair of adjacent two arc-shaped curved cover segments 100 form a layered surface 1204, and the surface where the top opening 1201 is located and the surface where the bottom opening 1203 is located are parallel to each other or have an included angle; or the layered surface 1204 is parallel to or has an included angle with any one of the surface where the top opening 1201 is located and the surface where the bottom opening 1203 is located.

[0069] Among them, the layered surface 1204 is a plane where the connection positions or connection points of the multiple groups of mutually connected arc-shaped curved segments 1211 between the adjacent two arc-shaped curved cover segments 100 are located. Further, as shown in Figure 3 and Figure 8 As shown, the outer cover grid further includes an adapter segment 1212 for adapting the adjacent two arc-shaped curved segments 1211, and at this time the layered surface 1204 is a plane where multiple connection positions or connection points of the two arc-shaped curved cover segments 100 respectively connected with the adapter segment 1212 are located, and the plane where the adapter segment 1212 is located is the layered surface 1204.

[0070] In this embodiment, in the extending direction of the fairing 10, the outer cover grille 121 is divided into multiple sequentially connected arc-shaped curved segments 1211 by the layering 1204. The bending directions of any two adjacent arc-shaped curved segments 1211 of the same outer cover grille 121 are opposite. In this embodiment, the surface where the top opening 1201 is located, the surface where the bottom opening 1203 is located, and the multiple layering 1204s are parallel to each other. The extending direction of the fairing 10 coincides with the axial direction of the fairing 10, facilitating the setting and processing of the fairing 12. It is understood that the number of layering 1204s can be adjusted according to actual conditions and is related to the number of arc-shaped fairing segments into which the fairing 12 is divided. The setting relationship between any layering 1204, the surface where the top opening 1201 is located, and the surface where the bottom opening 1203 is located can be adjusted according to actual conditions to achieve a conventional or torsional setting of the fairing 12. In one embodiment (not shown), the surface containing the top opening 1201 and the surface containing the bottom opening 1203 are parallel to each other. Any layer 1204 or a portion of a layer 1204 may have an angle with either the surface containing the top opening 1201 or the surface containing the bottom opening 1203, or a portion of a layer 1204 may have an angle with either the surface containing the top opening 1201 or the surface containing the bottom opening 1203, while another portion of a layer 1204 may be parallel to either the surface containing the top opening 1201 or the surface containing the bottom opening 1203. Alternatively, in another embodiment (not shown), the surface containing the top opening 1201 and the surface containing the bottom opening 1203 may have an angle, any layer 1204 may be parallel to one of the surfaces and have an angle with the other surface, or any layer 1204, the surface containing the top opening 1201, and the surface containing the bottom opening 1203 may all have an angle.

[0071] It should be noted that, as Figure 11 As shown, taking the plane where the adapter 11 is located as a horizontal plane as an example, in this embodiment, the points on the edge of the top opening 1201 are all on the same horizontal plane, and the points on the edge of the bottom opening 1203 are all on the same horizontal plane. Alternatively, the points on the edges of the top opening 1201 and the bottom opening 1203 have a height difference in the extension direction of the fan shroud, which can be an irregular shape such as a wave. The surface where the top opening 1201 is located is a plane formed by at least three points on the edge of the top opening 1201, and the same applies to the bottom opening 1203.

[0072] Similarly, as Figure 12As shown, the plane where the connecting points between two adjacent arc-shaped curved cover segments 100 are located is the layered plane 1204; similarly, there is a height difference between the connecting points between two adjacent arc-shaped curved cover segments 100 in the extension direction of the fan inlet. It can be understood that the shapes of the top opening 1201, the bottom opening 1203, and the connecting edges between two adjacent arc-shaped curved cover segments 100 can be adjusted according to actual conditions, and are not limited to the above-mentioned embodiments, which are not listed one by one here.

[0073] As shown in FIG. 1, Figures 1 to 13 As shown, the contour shape of the top opening 1201 is circular, elliptical, polygonal, and / or the contour shape of the projection of the cover body 12 on the plane perpendicular to the extension direction of the inlet 10 is circular, elliptical, polygonal. In this way, different shapes of the inlet 10 can be designed according to different application environments to ensure the flow regulation and noise reduction effects of the inlet 10. In the embodiment shown in FIG. 1, Figures 1 to 6 the inlet 10 in the first embodiment shown in FIG. 1, Figures 7 to 8 the inlet 10 in the second embodiment shown in FIG. 2, Figure 9 the inlet 10 in the third embodiment shown in FIG. 3, Figures 10 to 11 the inlet 10 in the fourth embodiment shown in FIG. 4, the shapes of the cover body 12 and the top opening 1201 are both circular, Figure 12 and Figure 13 the inlet 10 in the fifth embodiment shown in FIG. 5, the cover body 12 and the top opening 1201 are both elliptical. It can be understood that the contour shapes of the top opening 1201 and the cover body 12 can be adjusted according to actual conditions, and preferably, the contour shapes of the cross sections of the top opening 1201 and the cover body 12 are the same, wherein the aforementioned cross section is perpendicular to Figure 1 the extension direction of the inlet.

[0074] It should be noted that the polygon includes but is not limited to rectangle, trapezoid, triangle, etc., and the contour shapes of the cover body 12 and the top opening 1201 are not limited to circular, elliptical, polygonal in the embodiment, and other irregular shapes of the contour can be adjusted according to actual use to be suitable for different shapes of air ducts, which are not listed one by one here. The number of the top opening 1201 and the bottom opening 1203 can be one or more than one.

[0075] As shown in FIG. 1, Figures 1 to 13 As shown, the cover body 12 further comprises one or more annular gratings 123, and the annular grating 123 at the end of the extension direction of the cover body 12 can also be referred to as the top grating 122. For example, the top grating 122 is arranged at one end of the cover body 12 away from the fan 22, a plurality of annular gratings 123 are arranged at intervals along the extension direction of the inlet 10, and the annular grating 123 and the plurality of outer cover gratings 121 interleave to form a plurality of flow regulation openings 1202.

[0076] In this way, the plurality of annular gratings 123 are beneficial to the shaping of the plurality of straightening ports 1202, and improve the structural strength of the cover body 12. Since the plurality of straightening ports 1202 in the embodiment are all formed by interweaving the plurality of cover gratings 121 and the plurality of annular gratings 123, the directions and angles of the plurality of straightening ports 1202 are different, so that the straightening ports 1202 can straighten and transition the airflow from multiple angles and different directions, and improve the straightening effect and versatility of the fairing 10.

[0077] In the embodiment, the top grating 122 is located on one side of the plurality of annular gratings 123 along the extension direction of the fairing 10, and is arranged at one end of the plurality of cover gratings 121 and forms the top opening 1201. The annular gratings 123 are connected with the plurality of cover gratings 121, or some of the annular gratings 123 are connected with the plurality of cover gratings 121, so as to ensure the interweaving effect of the annular gratings 123 and the plurality of cover gratings 121. Further, the annular gratings 123 can be a whole annular grating or a multi-segment splicing structure composed of a plurality of arc gratings, as long as the annular gratings 123 can interweave with the plurality of cover gratings 121 to form the plurality of straightening ports 1202. The shape of the cover body 12 formed by the plurality of cover gratings 121 spaced around includes but is not limited to one or a combination of a circle, a rectangle, a trapezoid, an ellipse, a D type, an H type, a C type, an L type, a ring, and a star, and preferably, the shape of the cover body 12 surrounded by the annular gratings 123 and the plurality of cover gratings 121 is the same.

[0078] Preferably, the radial dimension of the cover body 12 gradually decreases in the extension direction of the fairing 10, and the radial dimension of the plurality of annular gratings 123 gradually decreases in the extension direction of the fairing 10.

[0079] In the embodiment, the top grating 122 is arranged at the top of the plurality of annular gratings 123 along the extension direction of the fairing 10 and forms the top opening 1201, and the radial dimension of the top grating 122 is smaller than that of the annular grating 123 adjacent to the top grating 122. In this way, the different angles and directions of the plurality of straightening ports 1202 of the fairing 10 can be ensured, so as to improve the straightening effect of the fairing 10 on the airflow from multiple directions. In another embodiment not shown in the figure, the radial dimension of the top grating 122 is the same as that of the annular grating 123 adjacent to the top grating 122; or the radial dimensions of the top grating 122 and the plurality of annular gratings 123 are the same; or the radial dimensions of two or more annular gratings 123 are the same.

[0080] It should be noted that in the extension direction of the fairing 10, the radial dimension of the plurality of annular gratings 123 changes in sequence in the same manner as the radial dimension of the cover body 10, and in this embodiment, the radial dimension of the plurality of annular gratings 123 gradually decreases with the gradual decrease of the radial dimension of the cover body 10. The radial dimension of the plurality of annular gratings 123 gradually decreases in the extension direction of the fairing 10, that is, the size of the plurality of annular gratings 123 is generally decreasing, and it can also be understood that the radial dimension of the plurality of annular gratings 123 gradually transitions from the radial dimension of the bottom opening 1203 to the radial dimension of the top opening 1201, and there is no annular grating 123 with the same size or annular grating 123 with increasing radial dimension.

[0081] Wherein the distance between any two outer cover gratings 121 can be adjusted according to actual conditions, the distance between any two annular gratings 123 can be adjusted according to actual conditions, and the distance between the top grating 122 and the annular grating 123 adjacent thereto can be adjusted according to actual conditions. Preferably, the distance between any two outer cover gratings 121 is the same, the distance between any two annular gratings 123 is the same, and the distance between the top grating 122 and the annular grating 123 adjacent thereto is equal to the distance between any two annular gratings 123.

[0082] As shown in Figure 5 The cover body 12 has a bottom opening 1203 at one end in the extension direction of the fairing 10, and the outer contour of the annular grating 123 is generally conical, and the angle of the conical surface of the annular grating 123 relative to the plane of the bottom opening 1203, or the angle of the conical surface of the annular grating 123 relative to the horizontal plane is C, 0°≤C≤90°.

[0083] In this way, the annular grating 123 can be used to adjust the flow direction, and the angle between the conical surface of the annular grating 123 and the inlet direction of the fairing 1202 can be used to adjust the strength of the vortex generated by the annular grating 123, thereby facilitating the machining and setting of the annular grating 123 according to actual conditions to further improve the flow straightening effect of the fairing 1202. As shown in Figures 1 to 6In the first embodiment shown, the conical surface of the annular grille 123 has an angle C relative to the plane containing the bottom opening 1203, where 0° < C < 90°. It is understood that in another embodiment (not shown), the conical surface of the annular grille 123 has an angle C = 90° or C = 0° relative to the plane containing the bottom opening 1203, or the conical surface of the annular grille 123 has an angle C relative to the horizontal plane where the fairing 10 is located, where 0° ≤ C ≤ 90°. It is understood that the annular grid 123 can be a circular ring structure or a conical ring structure with an inclined inner and / or outer side. The conical ring structure of the annular grid 123 can be an inner conical ring structure with a conical ring surface on the inner side (inner wall) and a cylindrical surface on the outer side (outer wall); or an outer conical ring structure with a conical ring surface on the outer side (outer wall) and a cylindrical surface on the inner side (inner wall); or an inner and outer conical ring structure with both the inner side (inner wall) and the outer side (outer wall) being conical ring surfaces. In this structure, the inner side (inner wall) and the outer side (outer wall) can be parallel to each other or have an included angle, and the outer side (outer wall) forms the outer circumferential surface of the conical ring cylinder. The overall shape of the outer contour of the ring grille 123 is not limited to the conical ring shape described in this embodiment. The cross-sectional shape of the ring grille 123 on the plane where the center line of the fairing 10 is located can also be one or a combination of circles, rectangles, trapezoids, ellipses, D-shaped, H-shaped, C-shaped, L-shaped, rings, stars, etc. The assembly (upright or inverted) of the conical ring structure can also be adjusted according to the actual situation.

[0084] like Figures 1 to 10 As shown, the fairing 10 also includes an adapter 11, with the fairing body 12 mounted on the adapter 11. The adapter 11 has through holes for airflow through the fairing body 12. It is understood that the adapter 11 can be connected and fixed to a top grille 122 forming a top opening 1201 at the top of the fairing body 12, or it can be connected and fixed to an annular grille 123 forming a bottom opening 1203 at the bottom of the fairing body 12. That is, the adapter 11 can be located at either the end of the fairing body 12 with a larger opening or the end with a smaller opening. The adapter 11 can also be connected and fixed to a part located in the middle of the fairing body 12, such as a layer 1204 on the fairing body 12, or a part located below the middle of the fairing body 12. Figure 11The annular grid 123 of the top grid 122 is connected and fixed. In the embodiment, the radial dimension of the top opening 1201 is smaller than the radial dimension of the bottom opening 1203, the adapter 11 is arranged on the bottom opening 1203 with a larger opening, the adapter 11 is arranged to facilitate the adapter of the fairing 10 and other structures, and the adapter 11 is provided with a through hole to facilitate the introduction or export of the air flow. Preferably, the curved protrusion of the first arc-shaped curved fairing segment 100 arranged on the adapter 11 protrudes to the side away from the axis of the fairing 12 to facilitate the installation of the fairing 12 and ensure the fairing effect. In another embodiment not shown in the figure, the curved protrusion of the first arc-shaped curved fairing segment 100 arranged on the adapter 11 can also protrude to the side close to the axis of the fairing 12.

[0085] As shown in Figure 9 the adapter 11 comprises a seat body 111 and a pipe body 112 connected with each other, and the seat body 111 is covered on one end of the pipe body 112. In this way, the adapter of the seat body 111 and the fairing 12 is realized through the pipe body 112, and the transition and buffering effect of the connection of the two is realized, so that the damage to the structure of the fairing 12 and the seat body 111 caused by the hard connection of the two is avoided. Specifically, the cross-sectional area of the pipe body 112 at different heights can be the same or different to improve the applicability of the pipe body 112 to the support of the fairing 12. It can be understood that the pipe body 112 can be arranged according to actual conditions. In the embodiment, the through hole of the adapter 11 penetrates the seat body 111 and the pipe body 112, and the seat body 111 is covered at the opening of the side of the pipe body 112 facing the seat body 111 to reduce the noise of the air flow passing through the adapter 11.

[0086] Preferably, the cross-sectional shape of the pipe body 112 is matched with the shape of the fairing 12.

[0087] As shown in Figure 3 the outer cover grid further comprises an adapter segment 1212 arranged between the two opposite parallel end faces of any two arc-shaped curved segments 1211. Specifically, in Figures 1 to 6 the first embodiment shown in the figure, the adapter segment 1212 is arranged between the two arc-shaped curved segments 1211, and the adapter segment 1212 increases the fairing area of the fairing 12 to improve the fairing effect of the fairing 12. It can be understood that the adapter segment 1212 can be arranged according to actual conditions.

[0088] Another embodiment of the utility model provides a fan assembly, the fan assembly comprises a unit 20 and the above-mentioned fairing 10, the unit 20 comprises a fan frame 21 and a fan 22 arranged in the fan frame 21, the fan frame 21 has an opening at both ends along its axial direction, and the fairing 10 is arranged on one of the openings to guide the air flow passing through the two openings and the fan 22.

[0089] In the embodiment, asFigure 2 As shown, the fairing 10 can be arranged on the fan frame 21 at one end where the bottom opening 1203 is located, and in this embodiment, the adapter 11 has a plurality of positioning holes, and the unit 20 is detachably connected with the adapter 11 through a plurality of screws which pass through the positioning holes one by one. Among them, the fan assembly can be arranged on the air inlet or air outlet of the air duct to regulate the fluid flowing through the air duct. On the other hand, as shown, Figure 14 As shown, the fairing 10 can also be arranged on the fan frame 21 at one end where the top opening 1201 is located.

[0090] Further, the fairing 10 in this embodiment can be multiple, and the multiple fairings 10 can be connected in series and / or parallel to form a combined fairing, and the overlapping degree of the projection of any two fairings 10 in the same plane can be adjusted according to the actual situation to achieve multi-stage regulation and improve the regulation effect. In addition, the fairing 10 can be convex to the fan 22, or can be convex away from the fan 22.

[0091] Another embodiment of the utility model provides a kind of air duct system, air duct system includes guide air duct 30, wind using equipment and above-mentioned fan assembly, guide air duct 30 and wind using equipment are communicated, to supply air to wind using equipment, or, the air flow in wind using equipment is guided out, fan assembly is arranged in guide air duct 30, to regulate the fluid that flows through guide air duct 30 inside. Specifically, as shown, Figure 6 As shown, the guide air duct can be provided with a plurality of air inlets, and one fairing 10 is arranged at one of the air inlets or air outlets. The cover body 12 of the fairing 10 can be convex to the guide air duct 30 as a whole, or can be located inside the guide air duct 30 as a whole.

[0092] As shown, Figures 16 to 18 In order to verify that the utility model fairing is not simply obtained by combining the existing embodiments, the fairing 10 of the fan assembly shown in Embodiment 1 is compared with the reference fairing provided by Figure 16 and Figure 17 The cover body of the reference fairing is composed of an inner grid group and an outer grid group. The outer grid group is curved away from the axis of the adapter, and the inner grid is curved towards the axis of the adapter. The inner grid group is arranged in the outer grid group. As shown, Figure 18 As shown, through acoustic simulation, a one-third octave band diagram is obtained, wherein, Figure 18 The ordinate of the total sound pressure level (dBA) represents the distance (mm) of the fairing 10 from the air inlet or air outlet, and Figure 18It can be known that the total sound pressure level at 1m of the reference fairing air inlet or air outlet is 87.92dBA, the total sound pressure level at 1m of the fairing 10 provided by the embodiment one of the utility model is 85.62dBA, and it can be known that the noise reduction effect of the fairing 10 provided by the utility model is better than that of the reference fairing shown in the formula (1) and the formula (2) in combination with the total sound pressure level at other distances. Figure 16 and Figure 17 the reference fairing shown in the formula (1) and the formula (2).

[0093] Another embodiment of the utility model provides a kind of equipment, equipment is applied to the air duct system described above, equipment includes: electrical equipment, power conversion equipment, such as inverter, PCS, charging pile, server, transformer, switchgear, air conditioner, mechanical equipment, such as machine tool, engine and other equipment etc.

[0094] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit exemplary embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising", when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.

[0095] The relative arrangement of components and steps, numerical expressions, and values set forth in these embodiments do not limit the scope of the utility model unless otherwise specifically stated. At the same time, it should be understood that the sizes of various parts shown in the drawings are not drawn in proportion to the actual proportions. The technology, methods and equipment known to those skilled in the relevant art can not be discussed in detail, but under appropriate circumstances, the technology, methods and equipment should be considered as part of the authorized description. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0096] In the description of the utility model, it should be understood that the orientation or position relationship indicated by orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like is usually based on the orientation or position relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the protection scope of the utility model; The orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0097] For ease of description, spatially relative terms, such as "beneath", "below", "lower", "above", "upper", and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device in the figures is inverted, elements described as "below" or "beneath" other elements or features would then be oriented "above" and "over" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of below and above. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. Well-known structures have been used consistently throughout this disclosure to

[0098] In addition, it should be noted that the use of "first", "second", and the like words of resemblance to limit parts, only for the convenience of the corresponding parts are distinguished, such as no other declaration, the above words have no special meaning, therefore can not be understood as the limitation of the scope of protection of the utility model.

[0099] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A fairing, characterized by, The fairing comprises a cover body (12), the cover body (12) comprises: a plurality of cover grids (121) distributed in a spaced manner; the cover grids (121) form a plurality of arc-shaped curved cover segments connected in sequence along the extension direction of the fairing, and the bending directions of any two adjacent arc-shaped curved cover segments among the at least two arc-shaped curved cover segments connected in sequence are opposite.

2. The fairing of claim 1, wherein, The cover grids (121) comprise a plurality of arc-shaped curved segments (1211) connected in sequence along the extension direction of the fairing, and the plurality of arc-shaped curved segments (1211) are respectively used for forming the plurality of arc-shaped curved cover segments; the arc-shaped curved segments (1211) are smooth curved segments, or the arc-shaped curved segments (1211) are quasi-smooth curved segments composed of a plurality of line segments with different slopes.

3. The fairing of claim 2, wherein, The plurality of arc-shaped curved segments (1211) are all smooth curved segments, any one of the arc-shaped curved segments (1211) has a first end (12111) and a second end (12112), a radial straight line of the first end (12111) and a radial straight line of the second end (12112) intersect and form an included angle A, 0° < A ≤ 90°; and a bending angle difference between any two adjacent arc-shaped curved segments (1211) is D, 0° ≤ D < 90°.

4. The fairing of claim 2, wherein, The cover grids (121) are inclined along the circumferential direction of the fairing at an inclination angle B, 0° < B < 90°, and / or the extension direction of the cover grids (121) is parallel to the extension direction of the fairing.

5. The fairing of claim 1, wherein, The cover body (12) comprises: a directional grid (121a) comprising one or more arc-shaped curved segments extending along the extension direction of the fairing or one or more straight line segments extending along the extension direction of the fairing; and the directional grid (121a) is arranged in a spaced manner with the cover grids (121).

6. The fairing of claim 1, wherein, The cover body (12) has opposite top openings (1201) and bottom openings (1203) in the extension direction of the fairing, wherein one end of the plurality of cover grids (121) surrounds the bottom openings (1203), and one end of the plurality of cover grids (121) away from the bottom openings (1203) surrounds the top openings (1201).

7. The fairing of claim 6, wherein, A layered surface (1204) is formed between at least one pair of adjacent arc-shaped curved cover segments, and the layered surface (1204) is parallel to or has an included angle with any one of a surface on which the top openings (1201) are located and a surface on which the bottom openings (1203) are located.

8. The fairing of claim 6, wherein, The surface on which the top openings (1201) are located and the surface on which the bottom openings (1203) are located are parallel to or have an included angle with each other.

9. The fairing of claim 1, wherein, The cover body (12) further comprises a plurality of annular grids (123), the plurality of annular grids (123) are arranged in a spaced manner along the extension direction of the fairing, and the annular grids (123) and the plurality of cover grids (121) are interwoven to form a plurality of fairing openings (1202).

10. The fairing of claim 9, wherein, The radial dimension of the cover body (12) gradually decreases in the extension direction of the fairing.

11. The fairing of claim 9, wherein, The bottom opening (1203) is located at one end of the cover body (12) along the extension direction of the fairing, the outer contour of the ring-shaped grille (123) is in the shape of a conical ring, and the included angle between the conical surface of the ring-shaped grille (123) and the plane where the bottom opening (1203) is located is C, or the included angle between the conical surface of the ring-shaped grille (123) and the horizontal plane is C, and 0°≤C≤90°.

12. The fairing of claim 2, wherein, The outer cover grille (121) further comprises an adapter section (1212) arranged between the two opposite parallel end faces of any two arc-shaped curved sections (1211).

13. The fairing of any one of claims 1 to 11, wherein, The fairing further comprises an adapter seat (11), the cover body (12) is arranged on the adapter seat (11), and the adapter seat (11) is provided with a through hole for the flow of air flowing through the cover body (12).

14. The fairing of claim 13, wherein, The adapter seat (11) comprises a seat body (111) and a pipe body (112) connected to each other, the seat body (111) is arranged on one end of the pipe body (112), and the cover body (12) is arranged on the seat body (111).

15. A fan assembly comprising: The fan assembly comprises a unit (20) and the fairing according to any one of claims 1 to 14, the unit (20) comprises a fan frame (21) and a fan (22) arranged in the fan frame (21), the fan frame (21) is provided with an opening at each end along the axial direction thereof, and the fairing is arranged on one of the openings to guide the air flow through the two openings and the fan (22).

16. An air duct system characterized by, The air duct system comprises a guide air duct (30), a wind-using device and the fan assembly according to claim 15, the guide air duct (30) and the wind-using device are communicated, and the fan assembly is arranged in the guide air duct (30) to guide the flow in the guide air duct (30).

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