Flow guide grid, axial flow fan device, fan and air conditioner

Abstract

The utility model discloses a flow guide grille, an axial flow fan device, a fan and an air conditioner, and relates to the technical field of air flow guide. The air deflector comprises an air deflector body, a plurality of bionic wing-shaped ribs and a plurality of flow guide pieces, the bionic wing-shaped ribs extend in the radial direction of the air deflector body respectively to form a convex flow guide face, and therefore the flow resistance of air flowing through the flow guide face is reduced. The multiple flow guide pieces are arranged between every two adjacent bionic wing-shaped ribs at intervals, and multiple sawtooth parts are arranged on the outer sides, facing the flow guide faces, of the flow guide pieces so that airflow flowing through the flow guide pieces can be rectified. Therefore, the flowing resistance of airflow entering the fan is reduced through the bionic wing-shaped ribs, and the interference of incoming turbulent flow on the fan blades is reduced. Meanwhile, noise generated by vortex separation when the air passes through the grille can be rectified and reduced through the sawtooth part, so that aerodynamic noise generated when the air enters the fan is integrally reduced, and the use comfort of a user is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air guide, in particular to a guide grille, an axial flow fan device, a fan and an air conditioner. Background Art

[0002] An axial flow fan refers to a fan whose airflow direction is the same as the axial direction of the fan. For example, an axial flow fan is usually used as a fan in an electric fan or a fan in the external unit of an air conditioner. In addition, axial flow fans are also often used in scenarios that require long-term high-speed operation.

[0003] However, during the operation of the current axial flow fan, as the speed of the fan increases, the corresponding noise will also increase. The aerodynamic noise generated by the air being sucked into the fan under the high-speed rotation of the fan is the main factor in the increase of noise. Therefore, the axial flow fan with high aerodynamic noise greatly reduces the user's comfort. Utility Model Content

[0004] In view of the above problems, the present utility model is proposed to provide a guide grille, an axial flow fan device, a fan and an air conditioner that overcome the above problems or at least partially solve the above problems.

[0005] Based on the first aspect of the utility model, a guide grille is provided, the guide grille comprising:

[0006] A plurality of bionic airfoil ribs, wherein the plurality of bionic airfoil ribs are respectively extended along the radial direction of the air guide plate to form an outwardly convex guide surface to reduce the flow resistance of air flowing through the guide surface;

[0007] A plurality of guide members, wherein the plurality of guide members are spaced apart between two adjacent bionic airfoil ribs, wherein the guide members are provided with a plurality of serrations toward the outer side of the guide surface to rectify the airflow passing through the guide members.

[0008] In an optional utility model, the bionic wing-shaped rib includes a seagull wing-shaped portion and a long-eared owl wing-shaped portion connected to the seagull wing-shaped portion, wherein the seagull wing-shaped portion and the long-eared owl wing-shaped portion are smoothly connected.

[0009] In an optional utility model, the long-eared owl airfoil portion is arranged away from the wind guide plate and is located in the high-speed airflow area of ​​the guide surface.

[0010] In an optional utility model, the seagull wing portion is connected to the wind guide plate and is located in a low-speed airflow area of ​​the guide surface.

[0011] In an optional utility model content, the seagull-wing portion includes a first seagull-wing rib and a second seagull-wing rib, and the long-eared owl wing portion is located between the first seagull-wing rib and the second seagull-wing rib, wherein the first seagull-wing rib is smoothly connected to the long-eared owl wing portion, and the long-eared owl wing portion is smoothly connected to the second seagull-wing rib, and the end of the first seagull-wing rib away from the long-eared owl wing portion is fixed to the wind guide plate.

[0012] In an optional utility model, the interval between two adjacent bionic airfoil ribs on the wind guide plate is between 10 mm and 50 mm.

[0013] In an optional utility model, the guide member is extended around a plurality of the bionic airfoil ribs to form an annular structure, and a plurality of the serrations are densely arranged on the guide member.

[0014] In an optional utility model, the guide grille further includes a connecting piece, and the connecting piece is located on the end surface of the bionic airfoil rib away from the air guide plate.

[0015] In an optional utility model, the connecting member is provided with an assembly hole for installing the guide grille.

[0016] Based on the second aspect of the utility model, an axial flow fan device is also provided, and the axial flow fan device includes a guide grille as described in any one of the above utility models.

[0017] Based on the third aspect of the utility model, a fan is also provided, and the fan includes the axial flow fan device as described in the above utility model.

[0018] Based on the fourth aspect of the utility model, an air conditioner is also provided, and the air conditioner includes the axial flow fan device as described in the above utility model.

[0019] Compared with the prior art, the utility model includes an air guide plate, a plurality of bionic airfoil ribs and a plurality of flow guides, wherein the plurality of bionic airfoil ribs are respectively extended radially along the air guide plate to form an outwardly convex flow guide surface to reduce the flow resistance of air flowing through the flow guide surface. The plurality of flow guides are arranged at intervals between two adjacent bionic airfoil ribs, wherein the flow guide is provided with a plurality of serrations toward the outside of the flow guide surface to rectify the airflow flowing through the flow guide. Thus, the bionic airfoil ribs can be used to reduce the flow resistance of the airflow entering the fan, and reduce the interference of the incoming turbulence on the fan blades. At the same time, the serrations can be used to rectify the airflow, reduce the noise generated by the vortex separation when the air passes through the grille, and thereby reduce the aerodynamic noise of the air entering the fan as a whole. The product applicability of the axial flow fan device is improved, and the user's comfort is greatly improved.

[0020] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limitations of the present invention. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings.

[0022] In the attached picture:

[0023] Figure 1 It is a structural schematic diagram of a guide grille provided by an embodiment of the utility model;

[0024] Figure 2 This is a schematic diagram of the structure of a bionic airfoil rib provided by an embodiment of the utility model;

[0025] Figure 3 It is a structural schematic diagram of a flow guide provided by an embodiment of the utility model;

[0026] Figure 4 yes Figure 1 A schematic diagram of the structure at position E in FIG.

[0027] Figure 5 It is a three-dimensional structural schematic diagram of a sawtooth portion provided by an embodiment of the utility model;

[0028] Figure 6 It is a structural side view of a sawtooth portion provided by an embodiment of the utility model;

[0029] Figure 7 It is a structural front view of a sawtooth portion provided by an embodiment of the utility model;

[0030] Figure 8 It is a schematic diagram of a cross-sectional curve of a seagull wing portion obtained by fitting provided in an embodiment of the utility model;

[0031] Fig. 9 This is a schematic diagram of a cross-sectional curve of a long-eared owl wing profile obtained by fitting according to the present invention;

[0032] Fig.10 It is a curve schematic diagram of a flow guide contact surface obtained by fitting provided by an embodiment of the utility model;

[0033] Fig.11 It is a three-dimensional structural schematic diagram of an axial flow fan device provided by an embodiment of the utility model.

[0034] Figure numerals: 1. wind guide plate; 2. bionic airfoil rib; 21. seagull wing portion; 211. first seagull wing rib; 212. second seagull wing rib; 22. long-eared owl wing portion; 3. flow guide; 31. serrated portion; 311. connecting surface; 312. flow guide contact surface; 4. connecting member; 41. assembly hole; 5. mounting plate. DETAILED DESCRIPTION

[0035] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0036] An axial flow fan refers to a fan whose airflow direction is the same as the axial direction of the fan blades, such as the fan used in electric fans and the fan in the outdoor unit of air conditioners. It is usually used in scenarios where long-term high-speed operation is required.

[0037] However, during the operation of the current axial flow fan, as the speed of the fan increases, the corresponding noise will also increase. Among them, the aerodynamic noise generated by the air being sucked into the fan under the high-speed rotation of the fan is the main factor in the increase of noise. Therefore, the axial flow fan with high aerodynamic noise greatly reduces the user's comfort.

[0038] Based on the above technical problems, an embodiment of the utility model is proposed. The embodiment of the utility model may include an air deflector 1, a plurality of bionic airfoil ribs 2 and a plurality of flow guides 3. The plurality of bionic airfoil ribs 2 are respectively extended along the radial direction of the air deflector 1 to form an outwardly convex flow guide surface to reduce the flow resistance of air flowing through the flow guide surface. The plurality of flow guides 3 are arranged between two adjacent bionic airfoil ribs 2 at intervals, wherein the flow guide 3 is provided with a plurality of serrations 31 toward the outside of the flow guide surface to rectify the airflow flowing through the flow guide 3. Thus, the flow resistance of the airflow entering the fan can be reduced by the bionic airfoil ribs 2, and the interference of the incoming turbulence on the fan blades can be reduced. At the same time, the serrations 31 can be used for rectification to reduce the noise generated by the vortex separation when the air passes through the grille, thereby reducing the aerodynamic noise of the air entering the fan as a whole. The product applicability of the axial flow fan device is improved, and the user's comfort is greatly improved.

[0039] Reference Figure 1-9The embodiment of the utility model provides a guide grille, which may include an air guide plate 1, a plurality of bionic airfoil ribs 2 and a plurality of guide members 3. The plurality of bionic airfoil ribs 2 are respectively extended along the radial direction of the air guide plate 1 to form an outwardly convex guide surface to reduce the flow resistance of air flowing through the guide surface. The plurality of guide members 3 are arranged between two adjacent bionic airfoil ribs 2 at intervals, wherein the guide member 3 is provided with a plurality of serrations 31 toward the outside of the guide surface to rectify the airflow flowing through the guide member 3.

[0040] In an embodiment of the utility model, the guide grille may include an air guide plate 1, a plurality of bionic airfoil ribs 2, and a plurality of guide members 3. The air guide plate 1 is used to provide the installation of the bionic airfoil ribs 2, and its cross-sectional shape may be circular. The plurality of bionic airfoil ribs 2 are arranged at equal angles around the center of the air guide plate 1. In some embodiments, the bionic airfoil ribs 2 and the air guide plate 1 may be fixed by welding. The structural stability between the bionic airfoil ribs 2 and the air guide plate 1 may be improved, thereby reducing the structural vibration noise of the guide grille.

[0041] The bionic airfoil ribs 2 can be understood as ribs that imitate the shape of a bird's wings when it spreads its wings. A plurality of the bionic airfoil ribs 2 are arranged to extend radially along the air guide plate 1 to form an outwardly convex guide surface. In other words, the guide direction of the guide surface is consistent with the air supply direction of the axial flow fan device. Thus, the air entering the axial flow fan device from the guide surface can be guided, and the air flow resistance caused by the guide grille to the air can be reduced. It can also reduce the interference of the incoming turbulent flow on the blades of the axial flow fan device, thereby reducing the aerodynamic noise of the axial flow fan device.

[0042] The guide member 3 is used to connect two adjacent bionic airfoil ribs 2, so as to improve the overall structural strength of the guide grille. Among them, a plurality of the guide members 3 are arranged at intervals between two adjacent bionic airfoil ribs 2. For example, a plurality of guide members 3 can be gradually densely arranged in the length direction from the bionic airfoil rib 2 close to the air guide plate 1 to away from the air guide plate 1. Among them, the gradually dense arrangement refers to the interval between two adjacent guide members 3, which gradually decreases along this length direction. Those skilled in the art can determine the interval between every two adjacent guide members 3 according to actual design requirements, and no excessive restrictions are made here. Among them, a plurality of the guide members 3 and a plurality of bionic airfoil ribs 2 are arranged in an interlaced manner to form guide mesh holes for air to pass through on the guide surface.

[0043] The guide member 3 is provided with a plurality of sawtooth portions 31 on the outside of the guide surface to rectify the airflow passing through the guide member 3, wherein rectification can be understood as being able to reduce the airflow disturbance generated when the air enters the guide mesh and inhibit the airflow separation, thereby avoiding the noise generated by the vortex separation when the air passes through the grille, thereby further reducing the aerodynamic noise when the air passes through the guide grille.

[0044] In an optional utility model embodiment, referring to Figure 1 As shown, the guide grille may include an air guide plate 1, a plurality of bionic airfoil ribs 2 and a plurality of guide members 3. The plurality of bionic airfoil ribs 2 are respectively extended along the radial direction of the air guide plate 1 to form an outwardly convex guide surface to reduce the flow resistance of air flowing through the guide surface. The bionic airfoil ribs 2 may include a seagull wing portion 21 and a long-eared owl wing portion 22 connected to the seagull wing portion 21, wherein the seagull wing portion 21 and the long-eared owl wing portion 22 are smoothly connected. The plurality of guide members 3 are spaced between two adjacent bionic airfoil ribs 2, wherein the guide member 3 is provided with a plurality of serrated portions 31 toward the outside of the guide surface to rectify the airflow flowing through the guide member 3.

[0045] In an embodiment of the utility model, the guide grille may include an air guide plate 1, a plurality of bionic airfoil ribs 2, and a plurality of guide members 3. The air guide plate 1 is used to provide the installation of the bionic airfoil ribs 2, and its cross-sectional shape may be circular. The plurality of bionic airfoil ribs 2 are arranged at equal angles around the center of the air guide plate 1. In some embodiments, the bionic airfoil ribs 2 and the air guide plate 1 may be fixed by welding. The structural stability between the bionic airfoil ribs 2 and the air guide plate 1 may be improved, thereby reducing the structural vibration noise of the guide grille.

[0046] The bionic airfoil ribs 2 can be understood as ribs that imitate the shape of a bird's wings when it spreads its wings. A plurality of the bionic airfoil ribs 2 are arranged to extend radially along the air guide plate 1 to form an outwardly convex guide surface. In other words, the guide direction of the guide surface is consistent with the air supply direction of the axial flow fan device. Thus, the air entering the axial flow fan device from the guide surface can be guided, and the air flow resistance caused by the guide grille to the air can be reduced. It can also reduce the interference of the incoming turbulent flow on the blades of the axial flow fan device, thereby reducing the aerodynamic noise of the axial flow fan device.

[0047] In some optional embodiments, referring to Figure 1As shown, the bionic airfoil rib 2 may include a seagull airfoil portion 21 and a long-eared owl airfoil portion 22 connected to the seagull airfoil portion 21, wherein the seagull airfoil portion 21 and the long-eared owl airfoil portion 22 are smoothly connected. Smooth connection may refer to that the connection between the seagull airfoil portion 21 and the long-eared owl airfoil portion 22 is a smooth curve. The seagull airfoil portion 21 and the long-eared owl airfoil portion 22 may move the airflow to the low pressure area by changing the pressure difference between the upper and lower sections of the bionic airfoil rib 2, thereby generating a flow guiding effect.

[0048] In some embodiments, the cross-sectional curve corresponding to the seagull airfoil portion 21 and the cross-sectional curve corresponding to the long-eared owl airfoil portion 22 can be determined by an inverse reconstruction method. For example, the airfoil curve at a position of 40% of the wing length along the wing extension direction of the seagull's wing can be fitted. The airfoil thickness at this position varies greatly and the contour is obvious. It is mainly used to support the seagull's own weight, and is greatly impacted by the airflow, and is a key part that affects the seagull's aerodynamic performance. As a result, the fitted seagull airfoil portion 21 has good flow-conducting performance.

[0049] In other embodiments, the airfoil curve at the position of 40% of the wing length of the long-eared owl along the wing extension direction can be fitted to obtain the cross-sectional curve corresponding to the long-eared owl airfoil portion 22. The airfoil thickness at this position varies greatly and has a distinct contour. It is mainly used to support the long-eared owl's own weight and is greatly impacted by the airflow, which is a key part affecting the aerodynamic performance of the long-eared owl. As a result, the fitted long-eared owl airfoil portion 22 has good flow-guiding performance.

[0050] The deflector 3 is used to connect two adjacent bionic airfoil ribs 2, so as to improve the overall structural strength of the deflector grille. A plurality of deflectors 3 are arranged between two adjacent bionic airfoil ribs 2 at intervals. For example, a plurality of deflectors 3 can be arranged gradually and densely in the length direction from the bionic airfoil rib 2 close to the air deflector 1 to the air deflector 1 away from the air deflector 1. The gradually dense arrangement means that the interval between two adjacent deflectors 3 gradually decreases along the length direction.

[0051] The guide member 3 is provided with a plurality of sawtooth portions 31 on the outside of the guide surface to rectify the airflow passing through the guide member 3, wherein rectification can be understood as being able to reduce the airflow disturbance generated when the air enters the guide mesh and inhibit the airflow separation, thereby avoiding the noise generated by the vortex separation when the air passes through the grille, thereby further reducing the aerodynamic noise when the air passes through the guide grille.

[0052] In some embodiments, the guide surface can also be divided into a high-speed airflow area and a low-speed airflow area according to the air flow rate, wherein the high-speed airflow area refers to the area where the guide surface is close to the top of the fan blade of the axial flow fan device (it can also be understood as the area away from the air guide plate 1); the low-speed airflow area refers to the area where the guide surface is close to the central axis of the axial flow fan device (it can also be understood as the area close to the air guide plate 1). Therefore, the gradually dense arrangement can also be understood as the arrangement of multiple guide members 3 gradually becoming denser from the low-speed airflow area to the high-speed airflow area. Therefore, the aerodynamic noise can be further reduced in the area with large airflow through the gradually densely arranged serrated portions 31.

[0053] Those skilled in the art can determine the interval between each two adjacent guide members 3 according to actual design requirements, and no further limitation is given here. The plurality of guide members 3 and the plurality of bionic airfoil ribs 2 are arranged in an interlaced manner to form guide mesh holes on the guide surface for air to pass through.

[0054] In an optional embodiment of the utility model, the long-eared owl airfoil portion 22 is arranged away from the wind guide plate 1 and is located in the high-speed airflow area of ​​the guide surface.

[0055] In the embodiment of the utility model, the long-eared owl airfoil portion 22 can be arranged away from the wind deflector 1, which is equivalent to being located in the high-speed airflow area of ​​the guide surface. Since the airfoil of the long-eared owl has good noise reduction performance, it can hunt silently at night. Therefore, considering that the aerodynamic noise of the airflow passing through the guide surface in the high-speed airflow area is obvious. The dense arrangement of the long-eared owl airfoil portion 22 and the serrated portion 31 can effectively reduce the aerodynamic noise in the high-speed airflow area.

[0056] In an optional embodiment of the utility model, the seagull wing portion 21 is connected to the wind guide plate 1 and is located in a low-speed airflow area of ​​the guide surface.

[0057] In the embodiment of the utility model, the seagull wing portion 21 can be arranged close to the wind deflector 1, and can be fixed to the wind deflector 1 by welding. It is located in the low-speed airflow area of ​​the guide surface. Since the seagull has good aerodynamic performance, the drag reduction and flow guiding effect in airflows with different Reynolds numbers is obvious. It enables it to glide smoothly in the wind and waves. Therefore, the seagull wing portion 21 and the serrated portion 31 can be used to guide the low-speed airflow area, greatly reducing the air flow resistance of the airflow passing through the guide surface.

[0058] In an optional embodiment of the utility model, the guide grille may include an air guide plate 1, a plurality of bionic airfoil ribs 2 and a plurality of guide members 3. The plurality of bionic airfoil ribs 2 are respectively extended along the radial direction of the air guide plate 1 to form an outwardly convex guide surface to reduce the flow resistance of air flowing through the guide surface. The bionic airfoil ribs 2 may include a seagull wing portion 21 and a long-eared owl wing portion 22 connected to the seagull wing portion 21, wherein the seagull wing portion 21 and the long-eared owl wing portion 22 are smoothly connected. The plurality of guide members 3 are spaced between two adjacent bionic airfoil ribs 2, and the guide member 3 is provided with a plurality of serrated portions 31 toward the outside of the guide surface to rectify the airflow flowing through the guide member 3. The seagull-wing portion 21 includes a first seagull-wing rib 211 and a second seagull-wing rib 212, and the long-eared owl-wing portion 22 is located between the first seagull-wing rib 211 and the second seagull-wing rib 212, wherein the first seagull-wing rib 211 is smoothly connected to the long-eared owl-wing portion 22, and the long-eared owl-wing portion 22 is smoothly connected to the second seagull-wing rib 212, and one end of the first seagull-wing rib 211 away from the long-eared owl-wing portion 22 is fixed to the wind guide plate 1.

[0059] In an embodiment of the utility model, the guide grille may include an air guide plate 1, a plurality of bionic airfoil ribs 2, and a plurality of guide members 3. The air guide plate 1 is used to provide the installation of the bionic airfoil ribs 2, and its cross-sectional shape may be circular. The plurality of bionic airfoil ribs 2 are arranged at equal angles around the center of the air guide plate 1. In some embodiments, the bionic airfoil ribs 2 and the air guide plate 1 may be fixed by welding. The structural stability between the bionic airfoil ribs 2 and the air guide plate 1 may be improved, thereby reducing the structural vibration noise of the guide grille.

[0060] The bionic airfoil ribs 2 can be understood as ribs that imitate the shape of a bird's wings when it spreads its wings. A plurality of the bionic airfoil ribs 2 are arranged to extend radially along the air guide plate 1 to form an outwardly convex guide surface. In other words, the guide direction of the guide surface is consistent with the air supply direction of the axial flow fan device. Thus, the air entering the axial flow fan device from the guide surface can be guided, and the air flow resistance caused by the guide grille to the air can be reduced. It can also reduce the interference of the incoming turbulent flow on the blades of the axial flow fan device, thereby reducing the aerodynamic noise of the axial flow fan device.

[0061] In some optional embodiments, the bionic airfoil rib 2 may include a seagull airfoil portion 21 and a long-eared owl airfoil portion 22 connected to the seagull airfoil portion 21, wherein the seagull airfoil portion 21 and the long-eared owl airfoil portion 22 are smoothly connected. Smooth connection may refer to that the connection between the seagull airfoil portion 21 and the long-eared owl airfoil portion 22 is a smooth curve. The seagull airfoil portion 21 and the long-eared owl airfoil portion 22 may move the airflow to the low pressure area by changing the pressure difference between the upper and lower sections of the bionic airfoil rib 2, thereby generating a diversion effect.

[0062] In some embodiments, the cross-sectional curve corresponding to the seagull airfoil portion 21 and the cross-sectional curve corresponding to the long-eared owl airfoil portion 22 can be determined by an inverse reconstruction method. For example, the airfoil curve at a position of 40% of the wing length along the wing extension direction of the seagull's wing can be fitted. The airfoil thickness at this position varies greatly and the contour is obvious. It is mainly used to support the seagull's own weight, and is greatly impacted by the airflow, and is a key part that affects the seagull's aerodynamic performance. As a result, the fitted seagull airfoil portion 21 has good flow-conducting performance.

[0063] In other embodiments, the airfoil curve at the position of 40% of the wing length of the long-eared owl along the wing extension direction can be fitted to obtain the cross-sectional curve corresponding to the long-eared owl airfoil portion 22. The airfoil thickness at this position varies greatly and has a distinct contour. It is mainly used to support the long-eared owl's own weight and is greatly impacted by the airflow, which is a key part affecting the aerodynamic performance of the long-eared owl. As a result, the fitted long-eared owl airfoil portion 22 has good flow-guiding performance.

[0064] The deflector 3 is used to connect two adjacent bionic airfoil ribs 2, so as to improve the overall structural strength of the deflector grille. A plurality of deflectors 3 are arranged between two adjacent bionic airfoil ribs 2 at intervals. For example, a plurality of deflectors 3 can be arranged gradually and densely in the length direction from the bionic airfoil rib 2 close to the air deflector 1 to the air deflector 1 away from the air deflector 1. The gradually dense arrangement means that the interval between two adjacent deflectors 3 gradually decreases along the length direction.

[0065] Reference Figure 3 As shown, the guide member 3 is provided with a plurality of sawtooth portions 31 on the outside of the guide surface to rectify the airflow passing through the guide member 3, wherein rectification can be understood as being able to reduce the airflow disturbance generated when the air enters the guide mesh and inhibit the airflow separation, thereby avoiding the noise generated by the vortex separation when the air passes through the grille, thereby further reducing the aerodynamic noise when the air passes through the guide grille.

[0066] In some embodiments, the guide surface can also be divided into a high-speed airflow area and a low-speed airflow area according to the air flow rate, wherein the high-speed airflow area refers to the area where the guide surface is close to the top of the fan blade of the axial flow fan device (it can also be understood as the area away from the air guide plate 1); the low-speed airflow area refers to the area where the guide surface is close to the central axis of the axial flow fan device (it can also be understood as the area close to the air guide plate 1). Therefore, the gradually dense arrangement can also be understood as the arrangement of multiple guide members 3 gradually becoming denser from the low-speed airflow area to the high-speed airflow area. Therefore, the aerodynamic noise can be further reduced in the area with large airflow through the gradually densely arranged serrated portions 31.

[0067] Those skilled in the art can determine the interval between each two adjacent guide members 3 according to actual design requirements, and no further limitation is given here. The plurality of guide members 3 and the plurality of bionic airfoil ribs 2 are arranged in an interlaced manner to form guide mesh holes on the guide surface for air to pass through.

[0068] In some embodiments, polynomial fitting may be used to determine the cross-sectional curve corresponding to the seagull wing portion 21 and the cross-sectional curve corresponding to the long-eared owl wing portion 22. In some embodiments, a fifth-order polynomial (y=a1x 5 +a2x 4 +a3x 3 +a4x 2 + a5x + A) to fit the curve corresponding to the pressure side of the gull wing 21, using a cubic polynomial (y = b1x 3 +b2x 2 +b3x+B) is used to fit the curve corresponding to the suction side of the seagull airfoil 21.

[0069] In some other implementations, a fifth-order polynomial (y=c1x 5 +c2x 4 +c3x 3 +c4x 2 +c5x+C) to fit the curve corresponding to the pressure side of the gull wing 21, using a cubic polynomial (y=d1x 3 +d2x 2 +d3x+D) ​​is used to fit the curve corresponding to the suction side of the seagull airfoil 21.

[0070] For the cross-sectional curve of the seagull airfoil 21, the coordinate point of the airfoil curve at the position of 40% of the wing length of the seagull's wing along the wing extension direction can be extracted in advance, and then fitted using a fifth-order polynomial. The cross-sectional curve of the seagull airfoil 21 can be obtained as follows: Figure 8As shown. Among them, the coefficients of the fifth-order polynomial corresponding to the fitted pressure side curve are as follows:

[0071] a1=-0.0001±1.258E-5, a2=0.0037±1.1124*10 -4 , a3 = -0.0419 ± 0.0035;

[0072] a4=0.2188±0.0051, a5=-0.3899±0.00011, A=0.6635±0.000243.

[0073] The coefficients of the cubic polynomial corresponding to the fitted suction side curve are as follows:

[0074] b1=0.0022±5.47*10 -5 , b2=-0.0386±0.000129, b3=0.1618±0.000136;

[0075] B=0.1686±0.00089.

[0076] For the cross-sectional curve of the long-eared owl-shaped part, the coordinate point of the airfoil curve at the position of 40% of the wing length of the long-eared owl wing along the wing extension direction can be extracted in advance, and then fitted using a fifth-order polynomial. The cross-sectional curve of the long-eared owl airfoil part 22 can be obtained as follows: Fig. 9 As shown, the coefficients of the fifth-order polynomial corresponding to the fitted pressure side curve are as follows:

[0077] c1=-0.0002±6.528*10 -5 , c2=0.0043±4.653*10 -4 , c3 = -0.0397 ± 0.00178;

[0078] c4=0.1878±0.00254, c5=-0.3057, C=2.6913±0.0005;

[0079] The coefficients of the cubic polynomial corresponding to the fitted suction side curve are as follows:

[0080] d1=0.0019±6.978*10 -4 , d2=-0.0369±5.5897*10 -4 , d3=0.1963±0.0023,

[0081] D=2.2762±0.0015.

[0082] Considering that the fitted seagull wing portion 21 and the long-eared owl wing portion 22 need to be smoothly connected, the seagull wing portion 21 may also include a first seagull wing rib 211 and a second seagull wing rib 212, and the long-eared owl wing portion 22 is located between the first seagull wing rib 211 and the second seagull wing rib 212, wherein the end of the first seagull wing rib 211 away from the long-eared owl wing portion 22 is fixed to the wind deflector 1. Thus, a smooth connection of two cross-sectional curves can be obtained based on fitting. One end of the first seagull wing rib 211 is fixed to the wind deflector 1, and the other end of the first seagull wing rib 211 is fixed to one end of the long-eared owl wing portion 22. The other end of the long-eared owl wing portion 22 is fixed to one end of the second seagull wing rib 212, and the other end of the second seagull wing rib 212 is fixed to the following connector 4. In some embodiments, the first gull-wing rib 211 , the long-eared owl wing portion 22 , and the second gull-wing rib 212 are an integrated structure.

[0083] Reference Figure 5 and Figure 6 As shown, the sawtooth portion 31 may further include a connecting surface 311 and a flow guiding contact surface 312, wherein the connecting surface 311 is used to connect two adjacent sawtooth portions 31. The flow guiding contact surface 312 is used to rectify the airflow passing through the flow guiding surface. The shape of the flow guiding contact surface 312 may be obtained by fitting a fourth-order polynomial (y=f1x4+f2x3+f3x2+f4x+F). For example, referring to Fig.10 As shown, the coefficients of the fourth-order polynomial corresponding to the flow-guiding contact surface 312 obtained by fitting are as follows:

[0084] f1=0.0123±7.11*10 -5 , f2=-0.2467±6.529*10 -4 , f3=1.7201±0.00021;

[0085] f4=-4.5991±0.000251, F=5.1194±0.0001.

[0086] The plurality of sawtooth portions 31 may be densely arranged, and the guide contact surfaces 312 of the plurality of sawtooth portions 31 are formed into a wave shape, and are obtained by reconstructing and fitting based on the coordinate points extracted from the tail of the wing of the long-eared owl. Figure 7 As shown, the angle θ of the sawtooth portion 31 and the top width e of the sawtooth portion 31 can vary according to the wind speed at the location of the sawtooth portion 31. In other words, the sawtooth portions 31 at different locations may have different corresponding shape structures. The angle θ of the sawtooth portion 31 and the top width e of the sawtooth portion 31 can be determined according to experimental test results, and are not limited here.

[0087] In an optional utility model embodiment, referring to Figure 4 As shown, the interval between two adjacent bionic airfoil ribs 2 on the air guide plate 1 is between 10 mm and 50 mm.

[0088] In the embodiment of the utility model. In order to ensure the flow-guiding and noise-reducing performance of the bionic airfoil rib 2, the interval d between two adjacent bionic airfoil ribs 2 on the air guide plate 1 is not less than 10 mm and not more than 50 mm. For example, if the interval d is too small, the production cost of the bionic airfoil rib 2 is increased and the air volume flowing through the guide surface is blocked. If the interval d is too large, the flow-guiding and noise-reducing performance of the bionic airfoil rib 2 is reduced. Therefore, the interval between two adjacent bionic airfoil ribs 2 on the air guide plate 1 can be 10 mm, 15 mm, 20 mm, 50 mm, etc. Those skilled in the art can determine the interval according to the size specifications of the actual axial flow fan device, and no excessive restrictions are made here.

[0089] In an optional utility model embodiment, referring to Figure 1 and Figure 3 As shown, the guide member 3 is extended around a plurality of the bionic airfoil ribs 2 to form an annular structure.

[0090] In the embodiment of the utility model, the guide member 3 can also be an annular structure, which can be fixed to the bionic airfoil rib 2 by welding. The guide member 3 with an annular structure can facilitate the reduction of assembly procedures and reduce the production cost of the guide grille. The overall structural stability of the guide grille can be further improved. Thereby, the vibration noise generated by the axial flow fan device due to structural problems can be reduced. For example, the number of the guide members 3 can be set to 9 layers, 10 layers, 11 layers, etc. Those skilled in the art can determine the number of the guide members 3 according to the specifications of the actual axial flow fan device, and no excessive restrictions are made here.

[0091] In an optional embodiment of the utility model, the guide grille may include an air guide plate 1, a plurality of bionic airfoil ribs 2, a plurality of guide members 3 and a connector 4. The plurality of bionic airfoil ribs 2 are respectively extended along the radial direction of the air guide plate 1 to form an outwardly convex guide surface to reduce the flow resistance of air flowing through the guide surface. The bionic airfoil ribs 2 may include a seagull wing portion 21 and a long-eared owl wing portion 22 connected to the seagull wing portion 21, wherein the seagull wing portion 21 and the long-eared owl wing portion 22 are smoothly connected. The plurality of guide members 3 are spaced between two adjacent bionic airfoil ribs 2, and the guide member 3 is provided with a plurality of serrated portions 31 toward the outside of the guide surface to rectify the airflow passing through the guide member 3.

[0092] The seagull wing portion 21 includes a first seagull wing rib 211 and a second seagull wing rib 212, and the long-eared owl wing portion 22 is located between the first seagull wing rib 211 and the second seagull wing rib 212, wherein one end of the first seagull wing rib 211 away from the long-eared owl wing portion 22 is fixed to the air deflector 1. The connecting member 4 is located on the end surface of the bionic wing rib 2 away from the air deflector 1, for example, the connecting member 4 and the second seagull wing rib 212 are on one end away from the long-eared owl wing portion 22.

[0093] In an embodiment of the utility model, the guide grille may include an air guide plate 1, a plurality of bionic airfoil ribs 2, and a plurality of guide members 3. The air guide plate 1 is used to provide the installation of the bionic airfoil ribs 2, and its cross-sectional shape may be circular. The plurality of bionic airfoil ribs 2 are arranged at equal angles around the center of the air guide plate 1. In some embodiments, the bionic airfoil ribs 2 and the air guide plate 1 may be fixed by welding. The structural stability between the bionic airfoil ribs 2 and the air guide plate 1 may be improved, thereby reducing the structural vibration noise of the guide grille.

[0094] The bionic airfoil ribs 2 can be understood as ribs that imitate the shape of a bird's wings when it spreads its wings. A plurality of the bionic airfoil ribs 2 are arranged to extend radially along the air guide plate 1 to form an outwardly convex guide surface. In other words, the guide direction of the guide surface is consistent with the air supply direction of the axial flow fan device. Thus, the air entering the axial flow fan device from the guide surface can be guided, and the air flow resistance caused by the guide grille to the air can be reduced. It can also reduce the interference of the incoming turbulent flow on the blades of the axial flow fan device, thereby reducing the aerodynamic noise of the axial flow fan device.

[0095] In some optional embodiments, the bionic airfoil rib 2 may include a seagull airfoil portion 21 and a long-eared owl airfoil portion 22 connected to the seagull airfoil portion 21, wherein the seagull airfoil portion 21 and the long-eared owl airfoil portion 22 are smoothly connected. Smooth connection may refer to that the connection between the seagull airfoil portion 21 and the long-eared owl airfoil portion 22 is a smooth curve. The seagull airfoil portion 21 and the long-eared owl airfoil portion 22 may move the airflow to the low pressure area by changing the pressure difference between the upper and lower sections of the bionic airfoil rib 2, thereby generating a diversion effect.

[0096] In some embodiments, the cross-sectional curve corresponding to the seagull airfoil portion 21 and the cross-sectional curve corresponding to the long-eared owl airfoil portion 22 can be determined by an inverse reconstruction method. For example, the airfoil curve at a position of 40% of the wing length along the wing extension direction of the seagull's wing can be fitted. The airfoil thickness at this position varies greatly and the contour is obvious. It is mainly used to support the seagull's own weight, and is greatly impacted by the airflow, and is a key part that affects the seagull's aerodynamic performance. As a result, the fitted seagull airfoil portion 21 has good flow-conducting performance.

[0097] In other embodiments, the airfoil curve at the position of 40% of the wing length of the long-eared owl along the wing extension direction can be fitted to obtain the cross-sectional curve corresponding to the long-eared owl airfoil portion 22. The airfoil thickness at this position varies greatly and has a distinct contour. It is mainly used to support the long-eared owl's own weight and is greatly impacted by the airflow, which is a key part affecting the aerodynamic performance of the long-eared owl. As a result, the fitted long-eared owl airfoil portion 22 has good flow-guiding performance.

[0098] The deflector 3 is used to connect two adjacent bionic airfoil ribs 2, so as to improve the overall structural strength of the deflector grille. A plurality of deflectors 3 are arranged between two adjacent bionic airfoil ribs 2 at intervals. For example, a plurality of deflectors 3 can be arranged gradually and densely in the length direction from the bionic airfoil rib 2 close to the air deflector 1 to the air deflector 1 away from the air deflector 1. The gradually dense arrangement means that the interval between two adjacent deflectors 3 gradually decreases along the length direction.

[0099] The guide member 3 is provided with a plurality of sawtooth portions 31 on the outside of the guide surface to rectify the airflow passing through the guide member 3, wherein rectification can be understood as being able to reduce the airflow disturbance generated when the air enters the guide mesh and inhibit the airflow separation, thereby avoiding the noise generated by the vortex separation when the air passes through the grille, thereby further reducing the aerodynamic noise when the air passes through the guide grille.

[0100] In some embodiments, the guide surface can also be divided into a high-speed airflow area and a low-speed airflow area according to the air flow rate, wherein the high-speed airflow area refers to the area where the guide surface is close to the top of the fan blade of the axial flow fan device (it can also be understood as the area away from the air guide plate 1); the low-speed airflow area refers to the area where the guide surface is close to the central axis of the axial flow fan device (it can also be understood as the area close to the air guide plate 1). Therefore, the gradually dense arrangement can also be understood as the arrangement of multiple guide members 3 gradually becoming denser from the low-speed airflow area to the high-speed airflow area. Therefore, the aerodynamic noise can be further reduced in the area with large airflow through the gradually densely arranged serrated portions 31.

[0101] Those skilled in the art can determine the interval between each two adjacent guide members 3 according to actual design requirements, and no further limitation is given here. The plurality of guide members 3 and the plurality of bionic airfoil ribs 2 are arranged in an interlaced manner to form guide mesh holes on the guide surface for air to pass through.

[0102] The connector 4 is located on the end surface of the bionic airfoil rib 2 away from the air guide plate 1, wherein the connector 4 and the second seagull wing rib 212 are on one end away from the long-eared owl airfoil portion 22. In other words, the connector 4 cooperates with the air guide plate 1 to fix the two ends of the plurality of bionic airfoil ribs 2 respectively. In addition, the connector 4 can expand the contact area between the guide grille and the mounting plate 5 of the axial flow fan device, thereby improving the connection stability of the guide grille and reducing structural vibration noise.

[0103] In an optional embodiment of the utility model, an assembly hole 41 is provided on the connecting member 4 for installation of the guide grille.

[0104] In the embodiment of the utility model, in order to facilitate the disassembly and assembly of the guide grille, the connecting member 4 is further provided with an assembly hole 41, so that a fastener can pass through the assembly hole 41 to detachably connect the guide grille to the mounting plate 5 of the axial flow fan device. For example, the fastener can be a bolt, a screw or other components.

[0105] Based on the second aspect of the utility model, an axial flow fan device is also provided, and the axial flow fan device includes a guide grille as described in any one of the above utility models.

[0106] In summary, the utility model embodiment discloses a guide grille, which may include a guide plate 1, a plurality of bionic airfoil ribs 2 and a plurality of guide members 3, wherein the plurality of bionic airfoil ribs 2 are respectively extended radially along the guide plate 1 to form an outwardly convex guide surface to reduce the flow resistance of air flowing through the guide surface. The plurality of guide members 3 are arranged between two adjacent bionic airfoil ribs 2 at intervals, wherein the guide member 3 is provided with a plurality of serrations 31 toward the outside of the guide surface to rectify the airflow flowing through the guide member 3. Thus, the bionic airfoil ribs 2 can be used to reduce the flow resistance of the airflow entering the fan, and reduce the interference of the incoming turbulence on the fan blades. At the same time, the serrations 31 can be used to rectify the airflow, reduce the noise generated by the vortex separation when the air passes through the grille, and thus reduce the aerodynamic noise of the air entering the fan as a whole. The product applicability of the axial flow fan device is improved, and the user's comfort is greatly improved.

[0107] Reference Fig.11As shown, an embodiment of the utility model further provides an axial flow fan device, and the axial flow fan device may include a guide grille as described in any one of the above utility model embodiments.

[0108] In the embodiment of the utility model, the guide grille is installed at the air inlet of the axial flow fan device. It is fixed on the mounting plate 5 of the axial flow fan device. The guide grille can also be installed at the air outlet of the axial flow fan device at the same time. Thereby, the aerodynamic noise generated by the axial flow fan device during operation can be further reduced.

[0109] In summary, the utility model embodiment discloses an axial flow fan device, which may include an air guide plate 1, a plurality of bionic airfoil ribs 2 and a plurality of guide members 3, wherein the plurality of bionic airfoil ribs 2 are respectively extended radially along the air guide plate 1 to form an outwardly convex guide surface to reduce the flow resistance of air flowing through the guide surface. The plurality of guide members 3 are arranged at intervals between two adjacent bionic airfoil ribs 2, wherein the guide member 3 is provided with a plurality of serrations 31 toward the outside of the guide surface to rectify the airflow flowing through the guide member 3. Thus, the bionic airfoil ribs 2 can be used to reduce the flow resistance of the airflow entering the fan, and reduce the interference of the incoming turbulence on the fan blades. At the same time, the serrations 31 can be used to rectify the airflow, reduce the noise generated by the vortex separation when the air passes through the grille, and thus reduce the aerodynamic noise of the air entering the fan as a whole. The product applicability of the axial flow fan device is improved, and the user's comfort is greatly improved.

[0110] By installing the guide grille, the noise of the whole machine can be reduced by about 0.8dB without affecting the air volume and power of the axial flow fan device, which greatly optimizes the product performance of the axial flow fan device and is conducive to improving the user experience.

[0111] The embodiment of the utility model further provides a fan, which may include the axial flow fan device as described in the embodiment of the utility model.

[0112] In summary, the utility model embodiment discloses a fan, which may include an air guide plate 1, a plurality of bionic airfoil ribs 2 and a plurality of guide members 3, wherein the plurality of bionic airfoil ribs 2 are respectively extended radially along the air guide plate 1 to form an outwardly convex guide surface to reduce the flow resistance of air flowing through the guide surface. The plurality of guide members 3 are arranged at intervals between two adjacent bionic airfoil ribs 2, wherein the guide member 3 is provided with a plurality of serrations 31 toward the outside of the guide surface to rectify the airflow flowing through the guide member 3. Thus, the bionic airfoil ribs 2 can be used to reduce the flow resistance of the airflow entering the fan, and reduce the interference of the incoming turbulence on the fan blades. At the same time, the serrations 31 can be used to rectify the airflow, reduce the noise generated by the vortex separation when the air passes through the grille, and thus reduce the aerodynamic noise of the air entering the fan as a whole. The product applicability of the axial flow fan device is improved, and the user's comfort is greatly improved.

[0113] The embodiment of the utility model further provides an air conditioner, which may include the axial flow fan device as described in the embodiment of the utility model.

[0114] In an embodiment of the utility model, the air conditioner may include an air guide plate 1, a plurality of bionic airfoil ribs 2 and a plurality of flow guides 3, wherein the plurality of bionic airfoil ribs 2 are respectively extended radially along the air guide plate 1 to form an outwardly convex flow guide surface to reduce the flow resistance of air flowing through the flow guide surface. The plurality of flow guides 3 are arranged at intervals between two adjacent bionic airfoil ribs 2, wherein the flow guide 3 is provided with a plurality of serrations 31 toward the outside of the flow guide surface to rectify the airflow flowing through the flow guide 3. Thus, the flow resistance of the airflow entering the fan can be reduced by the bionic airfoil ribs 2, and the interference of the incoming turbulence on the fan blades can be reduced. At the same time, the serrations 31 can be used for rectification to reduce the noise generated by the vortex separation when the air passes through the grille, thereby reducing the aerodynamic noise of the air entering the fan as a whole. The product applicability of the axial flow fan device is improved, and the user's comfort is greatly improved.

[0115] In summary, the utility model embodiment discloses a guide grille, an axial flow fan device, a fan and an air conditioner. The utility model embodiment may include a guide plate 1, a plurality of bionic airfoil ribs 2 and a plurality of guide members 3. The plurality of bionic airfoil ribs 2 are respectively extended along the radial direction of the guide plate 1 to form an outwardly convex guide surface to reduce the flow resistance of air flowing through the guide surface. The plurality of guide members 3 are arranged between two adjacent bionic airfoil ribs 2 at intervals, wherein the guide member 3 is provided with a plurality of serrations 31 toward the outside of the guide surface to rectify the airflow flowing through the guide member 3. Thus, the bionic airfoil ribs 2 can be used to reduce the flow resistance of the airflow entering the fan, and reduce the interference of the incoming turbulence on the fan blades. At the same time, the serrations 31 can be used to rectify the airflow, reduce the noise generated by the vortex separation when the air passes through the grille, and thus reduce the aerodynamic noise of the air entering the fan as a whole. The product applicability of the axial flow fan device is improved, and the user's comfort is greatly improved.

[0116] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0117] It is easy for a person skilled in the art to think that any combination of the above embodiments is feasible, so any combination of the above embodiments is an implementation scheme of the present utility model. However, due to space limitations, this specification will not describe them in detail here.

[0118] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0119] Similarly, it should be understood that in order to simplify the present invention and help understand one or more of the various aspects of the present invention, in the above description of exemplary embodiments of the present invention, the various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof.

[0120] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

Claims

1. A guide grille, characterized in that: The guide grille comprises: Air guide plate (1); A plurality of bionic airfoil ribs (2), wherein the plurality of bionic airfoil ribs (2) are respectively extended along the radial direction of the air guide plate (1) to form an outwardly convex flow guide surface to reduce the flow resistance of air flowing through the flow guide surface; A plurality of flow guides (3), wherein the plurality of flow guides (3) are arranged at intervals between two adjacent bionic airfoil ribs (2), wherein the flow guides (3) are provided with a plurality of sawtooth portions (31) facing the outside of the flow guide surface to rectify the airflow flowing through the flow guides (3).

2. The guide grid according to claim 1, characterized in that: The bionic wing-shaped rib (2) comprises a seagull wing-shaped portion (21) and a long-eared owl wing-shaped portion (22) connected to the seagull wing-shaped portion (21), wherein the seagull wing-shaped portion (21) and the long-eared owl wing-shaped portion (22) are smoothly connected.

3. The guide grid according to claim 2, characterized in that: The long-eared owl airfoil portion (22) is arranged away from the wind guide plate (1) and is located in the high-speed airflow area of ​​the guide surface.

4. The guide grid according to claim 3, characterized in that: The seagull wing portion (21) is connected to the wind guide plate (1) and is located in the low-speed airflow area of ​​the guide surface.

5. The guide grid according to claim 4, characterized in that: The seagull wing portion (21) comprises a first seagull wing rib (211) and a second seagull wing rib (212), and the long-eared owl wing portion (22) is located between the first seagull wing rib (211) and the second seagull wing rib (212), wherein the first seagull wing rib (211) is smoothly connected to the long-eared owl wing portion (22), and the long-eared owl wing portion (22) is smoothly connected to the second seagull wing rib (212), and one end of the first seagull wing rib (211) away from the long-eared owl wing portion (22) is fixed to the wind deflector (1).

6. The guide grid according to claim 1, characterized in that: The interval between two adjacent bionic airfoil ribs (2) on the wind guide plate (1) is between 10 mm and 50 mm.

7. The guide grid according to claim 1, characterized in that: The flow guide (3) is extended around the plurality of bionic airfoil ribs (2) to form an annular structure, and the plurality of sawtooth portions (31) are densely arranged on the flow guide (3).

8. The guide grid according to claim 1, characterized in that: The guide grille further comprises a connecting piece (4), wherein the connecting piece (4) is located on the end surface of the bionic airfoil rib (2) away from the air guide plate (1).

9. The guide grid according to claim 8, characterized in that: The connecting member (4) is provided with an assembly hole (41) for installing the guide grille.

10. An axial flow fan device, characterized in that: The device comprises a guide grid as described in any one of claims 1 to 9 above.

11. A fan, characterized in that: The fan comprises the axial flow fan device as claimed in claim 10.

12. An air conditioner, characterized in that: The air conditioner comprises the axial flow fan device as claimed in claim 10.

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