Axial flow fan blade, axial flow fan and circulating fan

Abstract

The utility model relates to an axial flow fan blade, an axial flow fan and a circulating fan. The axial flow fan blade comprises a first hub and a second hub, the at least two first blades are arranged on the periphery of the first hub, and a first air guide channel is formed between every two first blades; the first air guide channel is provided with a first air inlet and a first air outlet which are oppositely arranged in the first direction, and the first direction is the axial direction of the first hub. In the second direction intersecting with the first direction, the width delta a1 of the first air inlet is larger than the width delta a2 of the first air outlet. According to the axial flow fan with the axial flow fan blades and the circulating fan, the first air guide channel is formed between the first blades, the width of the first air inlet of the first air guide channel is larger than that of the first air outlet, so that the first air guide channel is a gradually-shrinking channel which is in transition from wide to narrow, and air flow can be accelerated when flowing through the first air guide channel; the air speed and the air feeling of outlet airflow of the axial flow fan blade are improved, and pneumatic noise is effectively reduced.

Description

Technical Field

[0001] This application relates to the field of fan technology, and in particular to an axial flow fan blade, an axial flow fan and a circulating fan. Background Technology

[0002] Currently, axial flow fans are widely used in various air handling equipment, such as circulating fans. The working efficiency and various performance characteristics of axial flow fans have a significant impact on the energy efficiency and user comfort of circulating fans.

[0003] To improve the airflow speed and feel of a circulating fan, the rotation speed of the axial fan blades or the height of the blades is usually increased. This increases aerodynamic noise or the axial thickness of the entire unit. Therefore, how to improve the airflow speed and feel of a circulating fan without increasing noise or size is an urgent problem to be solved. Utility Model Content

[0004] Therefore, it is necessary to provide an axial fan blade, an axial fan, and a circulating fan to address the issues of increased noise and size when improving the wind speed and airflow of the circulating fan.

[0005] An axial flow fan blade includes: a first hub; at least two first blades disposed on the outer periphery of the first hub, with a first air guide channel formed between each of the first blades; wherein the first air guide channel has a first air inlet and a first air outlet disposed opposite to each other along a first direction, the first direction being the axial direction of the first hub; in a second direction intersecting the first direction, the width δa1 of the first air inlet is greater than the width δa2 of the first air outlet. In the aforementioned axial flow fan blade, the first air guide channel is formed between each of the first blades, and the width of the first air inlet of the first air guide channel is greater than the width of the first air outlet, making the first air guide channel a gradually narrowing channel that transitions from wide to narrow. Airflow is accelerated when passing through the first air guide channel, increasing the wind speed and feel of the outlet airflow of the axial flow fan blade, and effectively reducing aerodynamic noise.

[0006] In some embodiments, the first hub has a first air inlet end with an outer diameter of d1, the outer diameter of the axial flow fan blade is D, and the width of the first air inlet is δa1 = 0.5(D-d1).

[0007] In some embodiments, the first hub also has a first air outlet, which is disposed opposite to the first air inlet along the first direction. The outer diameter of the first air outlet is D1, and the width of the first air outlet is δa2 = 0.5(D-D1).

[0008] In some embodiments, the ratio of the outer diameter D1 of the first air outlet to the outer diameter D of the axial flow fan blade is 0.5 to 0.7.

[0009] In some embodiments, the axial flow fan blades further include a second hub and at least two second blades, the second hub being located inside the first hub and spaced apart from the first hub, each second blade being disposed between the first hub and the second hub, and a second air guide channel being formed between each second blade.

[0010] In some embodiments, the second air guide channel has a second air outlet and a second air inlet disposed opposite to each other along the first direction; in the second direction, the width δb1 of the second air inlet is greater than the width δb2 of the second air outlet.

[0011] In some embodiments, the second hub has a second air inlet end with an outer diameter of d2 and a width of δb1 = 0.5(d1-d2).

[0012] In some embodiments, the second hub also has a second air outlet, which is disposed opposite to the second air inlet along the first direction. The outer diameter of the second air outlet is D2, and the width of the second air outlet is δb2=0.5(D1-D2).

[0013] In some embodiments, the ratio of the outer diameter D2 of the second air outlet to the outer diameter D of the axial flow fan blade is 0.2 to 0.5.

[0014] In some embodiments, the outer diameter D2 of the second air outlet is smaller than the outer diameter D1 of the first air outlet.

[0015] In some embodiments, in the first direction, the height of the first hub is △1, the height of the second hub is △2, and △2≤△1.

[0016] In some embodiments, the maximum hub height of the axial flow fan blade is Δh, Δ1≤Δh, Δh=(0.1~0.4)D.

[0017] In some embodiments, each of the first blades is evenly distributed along the outer periphery of the first hub, and the number of the first blades is n, where 5 ≤ n ≤ 9.

[0018] In some embodiments, each of the second blades is uniformly distributed along the outer periphery of the second hub, and the number of the second blades is n1, where n < n1 ≤ 2n, and the included angle β1 between two adjacent second blades is 360 / n1.

[0019] In some embodiments, each of the second blades is inclined relative to the normal of the circumferential side surface of the second hub.

[0020] In some embodiments, the angle between each of the second blades and the tangent of the second hub in the circumferential direction is β2, where 90°≤β2<180°.

[0021] In some embodiments, the circumferential side of the second hub is set at an angle to the first direction, and the angle between the circumferential side of the second hub and the first direction is α2, where 0°<α2≤90°.

[0022] In some embodiments, the circumferential side of the first hub is set at an angle to the first direction, and the angle between the circumferential side of the first hub and the first direction is α1, where 0° < α1 ≤ 90°.

[0023] An axial flow fan includes the aforementioned axial flow blades. In the aforementioned axial flow fan, a first air guide channel is formed between each first blade. The width of the first air inlet of the first air guide channel is greater than the width of the first air outlet, making the first air guide channel a gradually narrowing channel that transitions from wide to narrow. The airflow is accelerated when flowing through the first air guide channel, which increases the wind speed and wind feel of the outlet airflow of the axial flow blades and effectively reduces aerodynamic noise.

[0024] A circulating fan includes the aforementioned axial flow fan. In the circulating fan, a first air guide channel is formed between each first blade. The width of the first air inlet of the first air guide channel is greater than the width of the first air outlet, making the first air guide channel a gradually narrowing channel that transitions from wide to narrow. The airflow is accelerated when flowing through the first air guide channel, which increases the wind speed and wind feel of the outlet airflow of the axial flow fan blades and effectively reduces aerodynamic noise. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of axial flow fan blades in some embodiments of this application.

[0026] Figure 2 for Figure 1 The side view of the axial flow fan blades shown.

[0027] Figure 3 for Figure 2 The side view of the axial flow fan blades and the schematic diagram of the meridional flow channel dimensions are shown.

[0028] Figure 4 for Figure 1 The image shows a side view of an axial fan blade, with the outer diameter dimension indicated.

[0029] Figure 5 for Figure 1 The diagram shows an axial flow fan blade, with the outer diameter dimension indicated.

[0030] Figure 6 for Figure 1The image shows a side view of an axial fan blade, with its height and angle dimensions indicated.

[0031] Figure 7 This is a side view of an axial fan blade in some other embodiments of this application.

[0032] Figure 8 This is a side view of an axial flow fan blade in some embodiments of this application.

[0033] Figure 9 for Figure 1 The diagram shows an axial flow fan blade, with the angular dimensions indicated.

[0034] Figure label:

[0035] 100, First hub; 101, circumferential side of the first hub; 110, First air inlet; 120, First air outlet; 200, First blade; 210, First air guide channel; 211, First air inlet; 212, First air outlet; 300, Second hub; 301, circumferential side of the second hub; 310, Second air inlet; 320, Second air outlet; 400, Second blade; 410, Second air guide channel; 411, Second air outlet; 412, Second air inlet. Detailed Implementation

[0036] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0037] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] In this application, unless otherwise expressly specified and limited, the terms "initial," "connected," "linked," and "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0042] Currently, axial flow fans are widely used in various air handling equipment, such as circulating fans. The working efficiency and various performance characteristics of axial flow fans have a significant impact on the energy efficiency and user comfort of circulating fans.

[0043] To improve the airflow speed and feel of a circulating fan, the rotation speed of the axial fan blades or the height of the blades is usually increased. This increases aerodynamic noise or the axial thickness of the entire unit. Therefore, how to improve the airflow speed and feel of a circulating fan without increasing noise or size is an urgent problem to be solved.

[0044] Based on the above considerations, this application designs an axial flow fan blade, an axial flow fan, and a circulating fan. In the axial flow fan blade, a first air guide channel is formed between each first blade. The width of the first air inlet of the first air guide channel is greater than the width of the first air outlet, so that the first air guide channel is a gradually narrowing channel that transitions from wide to narrow. The airflow can be accelerated when it flows through the first air guide channel, which improves the wind speed and wind feel of the outlet airflow of the axial flow fan blade, and effectively reduces aerodynamic noise.

[0045] Please refer to Figures 1 to 3 In one embodiment, the axial flow fan blade includes a first hub 100 and at least two first blades 200. Each first blade 200 is disposed on the outer periphery of the first hub 100, and a first air guide channel 210 is formed between the first blades 200. The first air guide channel 210 has a first air inlet 211 and a first air outlet 212 disposed opposite to each other along a first direction, the first direction being the axial direction of the first hub 100; in a second direction intersecting the first direction, the width δa1 of the first air inlet 211 is greater than the width δa2 of the first air outlet 212.

[0046] It should be noted that the first direction is Figure 2 The X direction shown is the axial direction of the first hub 100; the second direction is... Figure 2 The Y direction shown is the radial direction of the first hub 100.

[0047] Here, the entire axial flow fan blade is assembled on the power output shaft of the motor. When the motor is running, the airflow is drawn into the first air guide channel 210 from the first air inlet 211. Then, under the action of the first blade 200, the airflow in the first air guide channel 210 is output from the first air outlet 212. Since the first blade 200 does work on the airflow, the axial flow fan blade converts mechanical energy into kinetic energy.

[0048] The aforementioned axial flow fan blades form a first air guide channel 210 between each first blade 200. The width of the first air inlet 211 of the first air guide channel 210 is greater than the width of the first air outlet 212, making the first air guide channel 210 a gradually narrowing channel that transitions from wide to narrow. The airflow can be accelerated when it flows through the first air guide channel 210, which increases the wind speed and wind feel of the outlet airflow of the axial flow fan blades and effectively reduces aerodynamic noise.

[0049] In the embodiments of this application, the first hub 100 is a hollow annular structure, which can be a circular ring, an elliptical ring, or other shapes.

[0050] In the embodiments of this application, each first blade 200 and the first hub 100 are integral structures, which have good integrity and are easy to assemble and disassemble quickly. For example, the first blade 200 and the first hub 100 are integrally formed by injection molding, casting or other methods. The shape and size of each first blade 200 are the same to facilitate the uniformity of air intake and exhaust.

[0051] In the embodiments of this application, a first air guide channel 210 is formed between every two adjacent first blades 200. Each first air guide channel 210 has the same size to facilitate the uniform distribution of airflow within each first air guide channel 210.

[0052] For details, please refer to Figure 3 and Figure 4 The first hub 100 has a first air inlet end 110, the outer diameter of the first air inlet end 110 is d1, the outer diameter of the axial flow fan blade is D, and the width of the first air inlet 211 is δa1=0.5(D-d1).

[0053] It should be noted that the outer diameter of the axial flow fan blade is D, which is the overall diameter of the axial flow fan blade; the outer diameter of the first air inlet 110 is d1, which is the diameter of the first air inlet 110; the width δa1 of the first air inlet 211 is the dimension of the first air inlet 211 in the second direction, which is the radial dimension of the first air inlet 211.

[0054] Here, since the first air inlet end 110 and the first air inlet 211 are located at the same end in the first direction, the width δa1 of the first air inlet 211 is equal to the difference between the radius of the axial flow fan blade (i.e. 0.5D) and the radius of the first air inlet end 110 (i.e. 0.5d1).

[0055] For more specific details, please refer to Figures 3 to 5 The first hub 100 also has a first air outlet 120, which is arranged opposite to the first air inlet 110 along a first direction. The outer diameter of the first air outlet 120 is D1, and the width of the first air outlet 212 is δa2=0.5(D-D1).

[0056] It should be noted that the outer diameter of the first air outlet 120 is D1, that is, the diameter of the first air outlet 120 is D1; ​​the width δa2 of the first air outlet 212 is the dimension of the first air outlet 212 in the second direction, that is, the radial dimension of the first air outlet 212.

[0057] Here, since the first air outlet 120 and the first air outlet 212 are located at the same end in the first direction, the width δa2 of the first air outlet 212 is equal to the difference between the radius of the axial flow fan blade (i.e. 0.5D) and the radius of the first air outlet 120 (i.e. 0.5D1).

[0058] For a specific embodiment, please refer to Figure 1 The ratio of the outer diameter D1 of the first air outlet 120 to the outer diameter D of the axial flow fan blade is 0.5~0.7.

[0059] Understandably, the ratio of the outer diameter of the first air outlet 120 to the outer diameter of the axial fan blade reflects the volume occupied by the first air outlet 120 of the first hub 100 relative to the axial fan blade. The larger the ratio, the larger the size of the first air outlet 120. By limiting the ratio of the outer diameter of the first air outlet 120 to the outer diameter of the axial fan blade, the first air outlet 120 of the first hub 100 does not occupy too much space, while ensuring that each first blade 200 can be smoothly fixed to the first hub 100.

[0060] Please refer to Figure 5 The axial flow fan blade also includes a second hub 300 and at least two second blades 400. The second hub 300 is located inside the first hub 100 and is spaced apart from the first hub 100. Each second blade 400 is located between the first hub 100 and the second hub 300, and a second air guide channel 410 is formed between each second blade 400.

[0061] It should be noted that when the motor is running, the airflow is drawn into the first air guide channel 210 from the first air inlet 211 and into the second air guide channel 410 from the second air inlet 412. Then, under the action of the first blade 200 and the second blade 400, the airflow in the first air guide channel 210 is output from the first air outlet 212 and the second air outlet 411. Since the second blade 400 is located in the inner ring and the first blade 200 is located in the outer ring, the first blade 200 mainly plays the role of doing work on the airflow, while the second blade 400 plays the role of pushing and accelerating the airflow in the outer ring to increase the wind speed of the outlet airflow.

[0062] In the embodiments of this application, the second hub 300 is a hollow annular structure, which can be a circular ring, an elliptical ring, or other shapes.

[0063] In the embodiments of this application, each second blade 400 and the second hub 300 are integral structures, which have good integrity and are easy to assemble and disassemble quickly. For example, the second blade 400 and the second hub 300 are integrally formed by injection molding, casting or other methods. The shape and size of each second blade 400 are the same to facilitate the uniformity of air intake and exhaust.

[0064] In the embodiments of this application, a second air guide channel 410 is formed between every two adjacent second blades 400. Each second air guide channel 410 has the same size to facilitate the uniform distribution of airflow within each second air guide channel 410.

[0065] Further, please refer to Figures 3 to 5 The second air guide channel 410 has a second air outlet 411 and a second air inlet 412 arranged opposite to each other in the first direction; in the second direction, the width δb1 of the second air inlet 412 is greater than the width δb2 of the second air outlet 411.

[0066] Understandably, the width of the second air inlet 412 of the second air guide channel 410 is greater than the width of the second air outlet 411, making the second air guide channel 410 a gradually narrowing channel that transitions from wide to narrow. The airflow can be accelerated when it flows through the second air guide channel 410, thereby increasing the wind speed and feel of the airflow at the outlet of the axial fan blade.

[0067] For details, please refer to Figures 3 to 5 The second hub 300 has a second air inlet end 310, the outer diameter of the second air inlet end 310 is d2, and the width of the second air inlet 412 is δb1=0.5(d1-d2).

[0068] It should be noted that the outer diameter of the second air inlet 310 is d2, that is, the diameter of the second air inlet 310 is d2; the width δb1 of the second air inlet 412 is the dimension of the second air inlet 412 in the second direction, that is, the radial dimension of the second air inlet 412.

[0069] Here, since the first air inlet 110, the second air inlet 310 and the second air inlet 412 are located at the same end in the first direction, the width δb1 of the second air inlet 412 is equal to the difference between the radius of the first air inlet 110 (i.e. 0.5d1) and the radius of the second air inlet 310 (i.e. 0.5d2).

[0070] For more specific details, please refer to Figures 3 to 5 The second hub 300 also has a second air outlet 320, which is arranged opposite to the second air inlet 310 along the first direction. The outer diameter of the second air outlet 320 is D2, and the width of the second air outlet 411 is δb2=0.5(D1-D2).

[0071] It should be noted that the outer diameter of the second air outlet 320 is D2, that is, the diameter of the second air outlet 320 is D2; the width δb2 of the second air outlet 411 is the dimension of the second air outlet 411 in the second direction, that is, the radial dimension of the second air outlet 411.

[0072] Here, since the first air outlet 120, the second air outlet 320 and the second air outlet 411 are located at the same end in the first direction, the width δb2 of the second air outlet 411 is equal to the difference between the radius of the first air outlet 120 (i.e., 0.5D1) and the radius of the second air outlet 320 (i.e., 0.5D2).

[0073] For a specific embodiment, please refer to Figures 3 to 5 The ratio of the outer diameter D2 of the second air outlet 320 to the outer diameter D of the axial flow fan blade is 0.2~0.5.

[0074] Understandably, the ratio of the outer diameter of the second air outlet 320 to the outer diameter of the axial fan blade reflects the volume occupied by the second air outlet 320 of the second hub 300 relative to the axial fan blade. A larger ratio indicates a larger size for the second air outlet 320. By limiting the ratio of the outer diameter of the second air outlet 320 to the outer diameter of the axial fan blade, the second air outlet 320 of the second hub 300 does not occupy excessive space, while simultaneously ensuring that each second blade 400 can be smoothly fixed to the second hub 300.

[0075] For a specific embodiment, please refer to Figures 3 to 5 The outer diameter D2 of the second air outlet 320 is smaller than the outer diameter D1 of the first air outlet 120.

[0076] Here, the ratio of the outer diameter of the second air outlet 320 to the outer diameter of the first air outlet 120 reflects the volume of the air outlets of the second hub 300 and the first hub 100. The larger the ratio of the outer diameter of the second air outlet 320 to the outer diameter of the first air outlet 120, the larger the size of the air outlet of the second hub 300. Through the above setting, the ratio of the outer diameter of the second air outlet 320 to the outer diameter of the first air outlet 120 ensures that the air outlets of the second hub 300 and the first hub 100 do not occupy too much space, while ensuring that the width of the second air outlet 411 and the first air outlet 212 meets the requirements.

[0077] Please refer to Figure 6 In the first direction, the height of the first hub 100 is △1, the height of the second hub 300 is △2, and △2≤△1.

[0078] It should be noted that the height of the hub affects the length of the airflow path within the flow channel. The greater the hub height, the longer the airflow path within the flow channel; the smaller the hub height, the shorter the airflow path within the flow channel. With the above settings, the height of the second hub 300 is less than or equal to the height of the first hub 100, which facilitates the flow of air through the first air guide channel 210 and the second air guide channel 410.

[0079] For details, please refer to Figure 6 and Figure 5 The maximum hub height of the axial flow fan blade is △h, △1≤△h, △h=(0.1~0.4)D.

[0080] It is understandable that the height △1 of the first hub 100 is less than or equal to the maximum hub height of the axial flow fan blade, and the maximum hub height of the axial flow fan blade is 0.1 to 0.4 times the outer diameter D of the axial flow fan blade.

[0081] Please refer to Figure 6Each first blade 200 is evenly distributed along the outer periphery of the first hub 100, and the number of first blades 200 is n, where 5≤n≤9.

[0082] It is understandable that a first air guide channel 210 is formed between every two adjacent first blades 200, and the number of first blades 200 affects the width of the first air guide channel 210. With the above arrangement, the number of first blades 200 is 5 to 9, which can effectively do work on the airflow without affecting the width of the first air guide channel 210.

[0083] In the embodiments of this application, each first blade 200 has the same shape and size to facilitate the uniformity of airflow.

[0084] In the embodiments of this application, reference is made to Figure 8 The first blade 200 can be a conventional blade or an airfoil, with the airfoil having the best aerodynamic effect. The airfoil has an installation angle of γ at the corresponding section, where 0° < γ < 60°.

[0085] Please refer to Figure 9 Each second blade 400 is evenly distributed along the outer periphery of the second hub 300. The number of second blades 400 is n1, where n < n1 ≤ 2n, and the included angle β1 between two adjacent second blades 400 is 360 / n1.

[0086] It is understandable that a second airflow channel 410 is formed between every two adjacent second blades 400, and the number of second blades 400 affects the width of the second airflow channel 410. With the above configuration, the number of second blades 400 is n~2n, which is more than the number of first blades 200. The second blades 400 can accelerate the airflow without affecting the width of the second airflow channel 410.

[0087] In the embodiments of this application, each second blade 400 has the same shape and size to facilitate the uniformity of airflow.

[0088] For details, please refer to Figure 9 Each second blade 400 is inclined relative to the normal of the circumferential side surface 301 of the second hub 300.

[0089] It should be noted that the normal line of the circumferential side 301 of the second wheel hub 300 is L1.

[0090] In the embodiments of this application, each second blade 400 is inclined relative to the normal of the circumferential side surface 301 of the second hub 300. The second blade 400 is a blade with an inclined angle, and the direction of rotation of the axial flow fan blade is taken as the positive direction. Figure 9 (As shown by the arrow), this allows the second blade 400 to accelerate the airflow.

[0091] For more specific details, please refer to Figure 9 The angle between the tangents of each second blade 400 and the second hub 300 in the circumferential direction is β2, where 90°≤β2<180°.

[0092] It should be noted that the tangent of the second hub 300 in the circumferential direction is L2.

[0093] In the embodiments of this application, the angle between the tangents of each second blade 400 and the second hub 300 in the circumferential direction is an obtuse angle, which facilitates the acceleration of airflow by the second blade 400. In other embodiments, the angle between the tangents of each second blade 400 and the second hub 300 in the circumferential direction may also be an acute angle.

[0094] Please refer to Figure 6 The circumferential side 301 of the second hub 300 is set at an angle to the first direction, and the angle between the circumferential side 301 of the second hub 300 and the first direction is α2, where 0°<α2≤90°.

[0095] Here, the circumferential side 301 of the second hub 300 is set at an angle to the first direction, which can be understood as: the circumferential side 301 of the second hub 300 is inclined relative to the axial direction of the second hub 300, that is, the second hub 300 is gradually expanding in the direction from the second air inlet end 310 to the second air outlet end 320.

[0096] In the embodiments of this application, reference is made to Figure 6 and Figure 7 Since the second hub 300 plays the role of supporting the entire axial flow fan blade, the circumferential side 301 of the second hub 300 can be an inclined planar structure or an arc surface structure with a certain curvature.

[0097] Further, please refer to Figure 6 The circumferential side 101 of the first hub 100 is set at an angle to the first direction, and the angle between the circumferential side 101 of the first hub 100 and the first direction is α1, where 0°<α1≤90°.

[0098] Here, the circumferential side 101 of the first hub 100 is set at an angle to the first direction, which can be understood as: the circumferential side 101 of the first hub 100 is set at an angle relative to the axial direction of the first hub 100, that is, the first hub 100 is gradually expanding in the direction from the first air inlet end 110 to the first air outlet end 120.

[0099] In the embodiments of this application, the circumferential side 101 of the first hub 100 is an inclined planar structure, which facilitates the fixing of each first blade 200 to the circumferential side 101 of the first hub 100.

[0100] Please refer to Figure 1 In one embodiment, the axial flow fan includes the aforementioned axial flow fan blades.

[0101] It should be noted that the aforementioned axial flow fan also includes components such as a drive unit and a guide ring. The drive unit is connected to the axial flow fan blades and is used to drive the axial flow fan blades to rotate. The axial flow fan blades are located inside the guide ring.

[0102] In the aforementioned axial flow fan, a first air guide channel 210 is formed between each first blade 200. The width of the first air inlet 211 of the first air guide channel 210 is greater than the width of the first air outlet 212, making the first air guide channel 210 a gradually narrowing channel that transitions from wide to narrow. The airflow can be accelerated when it flows through the first air guide channel 210, which increases the wind speed and wind feel of the outlet airflow of the axial flow fan blades and effectively reduces aerodynamic noise.

[0103] Please refer to Figure 1 In one embodiment, the circulating fan includes the axial flow fan described above.

[0104] It should be noted that the aforementioned circulating fan also includes components such as the casing and base, with the aforementioned axial flow fan installed on the casing.

[0105] In the aforementioned circulating fan, a first air guide channel 210 is formed between each first blade 200. The width of the first air inlet 211 of the first air guide channel 210 is greater than the width of the first air outlet 212, making the first air guide channel 210 a gradually narrowing channel that transitions from wide to narrow. The airflow can be accelerated when it flows through the first air guide channel 210, which increases the wind speed and wind feel of the outlet airflow of the axial fan blades and effectively reduces aerodynamic noise.

[0106] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0107] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An axial flow fan blade, characterized in that, include: First wheel hub (100); At least two first blades (200) are disposed on the outer periphery of the first hub (100), and a first air guide channel (210) is formed between each of the first blades (200). The first air guide channel (210) has a first air inlet (211) and a first air outlet (212) arranged opposite to each other along a first direction, the first direction being the axial direction of the first hub (100); in a second direction intersecting the first direction, the width δa1 of the first air inlet (211) is greater than the width δa2 of the first air outlet (212).

2. The axial flow fan blade according to claim 1, characterized in that, The first hub (100) has a first air inlet end (110), the outer diameter of the first air inlet end (110) is d1, the outer diameter of the axial flow fan blade is D, and the width of the first air inlet (211) is δa1=0.5(D-d1).

3. The axial flow fan blade according to claim 2, characterized in that, The first hub (100) also has a first air outlet (120), the first air outlet (120) and the first air inlet (110) are arranged opposite to each other along the first direction, the outer diameter of the first air outlet (120) is D1, and the width of the first air outlet (212) is δa2=0.5(D-D1).

4. The axial flow fan blade according to claim 3, characterized in that, The ratio of the outer diameter D1 of the first air outlet (120) to the outer diameter D of the axial flow fan blade is 0.5~0.

7.

5. The axial flow fan blade according to claim 3, characterized in that, The axial flow fan blades also include a second hub (300) and at least two second blades (400). The second hub (300) is located inside the first hub (100) and is spaced apart from the first hub (100). Each second blade (400) is disposed between the first hub (100) and the second hub (300), and a second air guide channel (410) is formed between each second blade (400).

6. The axial flow fan blade according to claim 5, characterized in that, The second air guide channel (410) has a second air outlet (411) and a second air inlet (412) arranged opposite to each other along the first direction; in the second direction, the width δb1 of the second air inlet (412) is greater than the width δb2 of the second air outlet (411).

7. The axial flow fan blade according to claim 6, characterized in that, The second hub (300) has a second air inlet (310), the outer diameter of the second air inlet (310) is d2, and the width of the second air inlet (412) is δb1=0.5(d1-d2).

8. The axial flow fan blade according to claim 7, characterized in that, The second hub (300) also has a second air outlet (320), which is arranged opposite to the second air inlet (310) along the first direction. The outer diameter of the second air outlet (320) is D2, and the width of the second air outlet (411) is δb2=0.5(D1-D2).

9. The axial flow fan blade according to claim 8, characterized in that, The ratio of the outer diameter D2 of the second air outlet (320) to the outer diameter D of the axial flow fan blade is 0.2~0.

5.

10. The axial flow fan blade according to claim 8, characterized in that, The outer diameter D2 of the second air outlet (320) is smaller than the outer diameter D1 of the first air outlet (120).

11. The axial flow fan blade according to claim 5, characterized in that, In the first direction, the height of the first hub (100) is △1, and the height of the second hub (300) is △2, where △2≤△1.

12. The axial flow fan blade according to claim 11, characterized in that, The maximum hub height of the axial flow fan blade is △h, △1≤△h, △h=(0.1~0.4)D.

13. The axial flow fan blade according to claim 5, characterized in that, Each of the first blades (200) is evenly distributed along the outer periphery of the first hub (100), and the number of the first blades (200) is n, where 5≤n≤9.

14. The axial flow fan blade according to claim 13, characterized in that, Each of the second blades (400) is evenly distributed along the outer periphery of the second hub (300), and the number of the second blades (400) is n1, n < n1 ≤ 2n, wherein the included angle β1 between two adjacent second blades (400) is 360 / n1.

15. The axial flow fan blade according to claim 14, characterized in that, Each of the second blades (400) is inclined relative to the normal of the circumferential side surface (301) of the second hub.

16. The axial flow fan blade according to claim 14, characterized in that, The angle between the tangents of each of the second blades (400) and the second hub (300) in the circumferential direction is β2, where 90°≤β2<180°.

17. The axial flow fan blade according to claim 5, characterized in that, The circumferential side (301) of the second wheel hub is set at an angle to the first direction, and the angle between the circumferential side (301) of the second wheel hub and the first direction is α2, 0°<α2≤90°.

18. The axial flow fan blade according to claim 1, characterized in that, The circumferential side surface (101) of the first wheel hub is set at an angle to the first direction, and the angle between the circumferential side surface (101) of the first wheel hub and the first direction is α1, 0°<α1≤90°.

19. An axial flow fan, characterized in that, Including axial flow fan blades as described in any one of claims 1-18.

20. A circulating fan, characterized in that, Including the axial flow fan as described in claim 19.

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