Axial flow fan blade, axial flow fan and circulating fan

Abstract

The invention 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] The present application relates to the technical field of fans, and in particular to an axial flow fan blade, an axial flow fan and a circulating fan. Background Art

[0002] At present, axial flow fan blades are widely used in various air handling equipment, such as circulation fans. The working efficiency and various performances of axial flow fan blades have an important impact on the energy efficiency and comfort of circulation fans.

[0003] In order to improve the wind speed and wind feeling of the circulation fan, most of the time the rotation speed of the axial flow fan blades will be increased or the height of the fan blades will be increased, which will increase the aerodynamic noise or the axial thickness of the whole machine. Therefore, how to improve the wind speed and wind feeling of the circulation fan without increasing the noise and size is an urgent problem to be solved. Summary of the invention

[0004] Based on this, it is necessary to provide an axial flow fan blade, an axial flow fan and a circulation fan to address the problem of increasing noise and size when improving the wind speed and wind feeling of the circulation fan.

[0005] An axial flow fan blade comprises: a first hub; at least two first blades, which are arranged on the outer periphery of the first hub, and a first air guide channel is formed between each of the first blades; wherein the first air guide channel has a first air inlet and a first air outlet which are arranged opposite to each other along a first direction, and the first direction is the axial direction of the first hub; in a second direction intersecting with the first direction, the width δa1 of the first air inlet is greater than the width δa2 of the first air outlet. In the above-mentioned axial flow fan blade, a 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, so that the first air guide channel is a tapered channel that transitions from wide to narrow, and the airflow can be accelerated when flowing through the first air guide channel, thereby improving the wind speed and wind feeling 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, the outer diameter of the first air inlet end is 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 further has a first air outlet end, the first air outlet end is arranged opposite to the first air inlet end along the first direction, the outer diameter of the first air outlet end is D1, and the width of the first air outlet δa2=0.5(D-D1).

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

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

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

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

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

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

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

[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 △h, △1≤△h, △h=(0.1~0.4)D.

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

[0018] In some embodiments, the second blades are evenly distributed along the outer circumference of the second hub, the number of the second blades is n1, n<n1≤2n, and the angle β1 between two adjacent second blades is 360 / n1.

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

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

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

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

[0023] An axial flow fan includes the above-mentioned axial flow fan blade. In the above-mentioned axial flow fan, a first air guide channel is formed between each first blade, and 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 contracting channel that transitions from wide to narrow, and the airflow can be accelerated when flowing through the first air guide channel, thereby improving the wind speed and wind feeling of the outlet airflow of the axial flow fan blade, and effectively reducing aerodynamic noise.

[0024] A circulation fan includes the above-mentioned axial flow fan. In the above-mentioned circulation fan, a first air guide channel is formed between each first blade, and 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 contracting channel that transitions from wide to narrow, and the airflow can be accelerated when flowing through the first air guide channel, thereby improving the wind speed and wind feeling of the outlet airflow of the axial flow fan blade, and effectively reducing aerodynamic noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of axial flow blades in some embodiments of the present application.

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

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

[0028] Figure 4 for Figure 1 A side view of an axial flow fan blade is shown with the outer diameter dimension indicated.

[0029] Figure 5 for Figure 1 A schematic diagram of an axial flow fan blade is shown, with the outer diameter dimension indicated.

[0030] Figure 6 for Figure 1A side view of an axial flow fan blade is shown with height and angular dimensions indicated.

[0031] Figure 7 It is a side view of an axial flow fan blade in some other embodiments of the present application.

[0032] Figure 8 It is a side view of an axial flow fan blade in some other embodiments of the present application.

[0033] Fig. 9 for Figure 1 A schematic diagram of an axial flow fan blade is shown, with angular dimensions indicated.

[0034] Reference numerals:

[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 DESCRIPTION

[0036] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0039] In this application, unless otherwise clearly specified and limited, the terms "initial", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0041] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0042] At present, axial flow fan blades are widely used in various air handling equipment, such as circulation fans. The working efficiency and various performances of axial flow fan blades have an important impact on the energy efficiency and comfort of circulation fans.

[0043] In order to improve the wind speed and wind feeling of the circulation fan, most of the time the rotation speed of the axial flow fan blades will be increased or the height of the fan blades will be increased, which will increase the aerodynamic noise or the axial thickness of the whole machine. Therefore, how to improve the wind speed and wind feeling of the circulation fan without increasing the noise and size is an urgent problem to be solved.

[0044] Based on the above considerations, the present 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 tapered channel transitioning from wide to narrow. The airflow can be accelerated when flowing through the first air guide channel, thereby improving the wind speed and wind feeling of the outlet airflow of the axial flow fan blade and effectively reducing the 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 of which is arranged 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 which are arranged opposite to each other along a first direction, and the first direction is the axial direction of the first hub 100; in a second direction intersecting with 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 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 sucked into the first air guide channel 210 from the first air inlet 211, and 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] In the above-mentioned axial flow fan blade, a first air guide channel 210 is formed between each first blade 200, and 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, so that the first air guide channel 210 is a tapered channel transitioning from wide to narrow. The airflow can be accelerated when flowing through the first air guide channel 210, thereby improving the wind speed and wind feeling of the outlet airflow of the axial flow fan blade and effectively reducing the aerodynamic noise.

[0049] In the embodiment of the present application, the first hub 100 is a hollow annular structure, and the annular structure may be a circular ring, an elliptical ring or other shapes.

[0050] In the embodiment of the present application, each first blade 200 and the first hub 100 are an integrated structure, which has good integrity and is easy to quickly disassemble and assemble. For example, the first blade 200 and the first hub 100 are integrally formed by injection molding, casting, etc. Among them, the shape and size of each first blade 200 are the same, so as to facilitate the uniformity of air inlet and outlet.

[0051] In the embodiment of the present application, a first air guiding channel 210 is formed between every two adjacent first blades 200 , and the first air guiding channels 210 have the same size to facilitate uniform distribution of airflow in the first air guiding channels 210 .

[0052] Specifically, 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 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, that is, the overall diameter of the axial flow fan blade is D; the outer diameter of the first air inlet end 110 is d1, that is, the diameter of the first air inlet end 110 is d1; the width δa1 of the first air inlet 211 is also the size of the first air inlet 211 in the second direction, that is, the radial size 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 blade (ie 0.5D) and the radius of the first air inlet end 110 (ie 0.5d1).

[0055] More specifically, please refer to Figures 3 to 5 The first hub 100 also has a first air outlet end 120, which is arranged opposite to the first air inlet end 110 along a first direction. The outer diameter of the first air outlet end 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 also the size of the first air outlet 212 in the second direction, that is, the radial size 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 blade (ie 0.5D) and the radius of the first air outlet 120 (ie 0.5D1).

[0058] For details about this embodiment, please refer to Figure 1 The ratio of the outer diameter D1 of the first air outlet end 120 to the outer diameter D of the axial flow fan blade is 0.5-0.7.

[0059] It can be understood that the ratio of the outer diameter of the first air outlet end 120 to the outer diameter of the axial flow fan blade reflects the volume of the first air outlet end 120 of the first hub 100 occupied by the axial flow fan blade. The larger the ratio of the outer diameter of the first air outlet end 120 to the outer diameter of the axial flow fan blade, the larger the size of the first air outlet end 120. By limiting the ratio of the outer diameter of the first air outlet end 120 to the outer diameter of the axial flow fan blade, the first air outlet end 120 of the first hub 100 will not occupy too much space as a whole, and 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 in 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.

[0061] It should be noted that when the motor is running, the airflow is sucked 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 circle and the first blade 200 is located in the outer circle, the first blade 200 mainly plays a role in doing work on the airflow, and the second blade 400 plays a role in promoting and accelerating the airflow in the outer circle to increase the wind speed of the outlet airflow.

[0062] In the embodiment of the present application, the second hub 300 is a hollow annular structure, and the annular structure may be a circular ring, an elliptical ring or other shapes.

[0063] In the embodiment of the present application, each second blade 400 and the second hub 300 are an integrated structure, which has good integrity and is easy to quickly disassemble and assemble. For example, the second blade 400 and the second hub 300 are integrally formed by injection molding, casting, etc. Among them, the shape and size of each second blade 400 are the same, which is conducive to the uniformity of air inlet and outlet.

[0064] In the embodiment of the present application, a second air guiding channel 410 is formed between every two adjacent second blades 400 , and the second air guiding channels 410 have the same size to facilitate uniform distribution of airflow in the second air guiding channels 410 .

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

[0066] It can be understood that 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, so that the second air guide channel 410 is a tapered channel that transitions from wide to narrow. The airflow can be accelerated when flowing through the second air guide channel 410, thereby improving the wind speed and wind feeling of the outlet airflow of the axial flow fan blade.

[0067] Specifically, 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 end 310 is d2, that is, the diameter of the second air inlet end 310 is d2; the width δb1 of the second air inlet 412 is the size of the second air inlet 412 in the second direction, that is, the radial size of the second air inlet 412.

[0069] Here, since the first air inlet end 110, the second air inlet end 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 end 110 (i.e. 0.5d1) and the radius of the second air inlet end 310 (i.e. 0.5d2).

[0070] More specifically, please refer to Figures 3 to 5 The second hub 300 also has a second air outlet end 320, which is arranged opposite to the second air inlet end 310 along the first direction. The outer diameter of the second air outlet end 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 size of the second air outlet 411 in the second direction, that is, the radial size of the second air outlet 411.

[0072] Here, since the first air outlet end 120, the second air outlet end 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 end 120 (ie 0.5D1) and the radius of the second air outlet end 320 (ie 0.5D2).

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

[0074] It can be understood that the ratio of the outer diameter of the second air outlet end 320 to the outer diameter of the axial flow fan blade reflects the volume of the second air outlet end 320 of the second hub 300 occupied by the axial flow fan blade. The larger the ratio of the outer diameter of the second air outlet end 320 to the outer diameter of the axial flow fan blade, the larger the size of the second air outlet end 320. Through the above configuration, the ratio of the outer diameter of the second air outlet end 320 to the outer diameter of the axial flow fan blade is limited, so that the second air outlet end 320 of the second hub 300 will not occupy too much space as a whole, and at the same time, each second blade 400 can be smoothly fixed to the second hub 300.

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

[0076] Here, the ratio of the outer diameter of the second air outlet end 320 to the outer diameter of the first air outlet end 120 reflects the volume of the air outlet ends of the second hub 300 and the first hub 100. The larger the ratio of the outer diameter of the second air outlet end 320 to the outer diameter of the first air outlet end 120, the larger the size of the air outlet end of the second hub 300. Through the above configuration, the ratio of the outer diameter of the second air outlet end 320 to the outer diameter of the first air outlet end 120 can ensure that the air outlet ends of the second hub 300 and the first hub 100 do not occupy too much space as a whole, and at the same time, the width of the second air outlet 411 and the first air outlet 212 meet 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 will affect the length of the path of the airflow in the flow channel. The greater the height of the hub, the longer the path of the airflow in the flow channel; the smaller the height of the hub, the shorter the path of the airflow in the flow channel. Through the above arrangement, the height of the second hub 300 is less than or equal to the height of the first hub 100, which is conducive to the flow of airflow in the first air guide channel 210 and the second air guide channel 410.

[0079] Specifically, 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 can be understood 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 0.1-0.4 times the outer diameter D of the axial flow fan blade.

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

[0082] It is understandable that a first air guiding 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 guiding channel 210. Through the above configuration, the number of first blades 200 is 5 to 9, which can effectively work on the airflow without affecting the width of the first air guiding channel 210.

[0083] In the embodiment of the present application, the shapes and sizes of the first blades 200 are the same, so as to facilitate the uniformity of the incoming and outgoing winds.

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

[0085] Please refer to Fig. 9 The second blades 400 are evenly distributed along the outer circumference of the second hub 300 , the number of the second blades 400 is n1, n<n1≤2n, wherein the angle β1 between two adjacent second blades 400 is 360 / n1.

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

[0087] In the embodiment of the present application, the second blades 400 have the same shape and size to facilitate the uniformity of air inlet and outlet.

[0088] Specifically, please refer to Fig. 9 Each second blade 400 is arranged to be inclined relative to the normal line of the circumferential side surface 301 of the second hub 300 .

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

[0090] In the embodiment of the present application, each second blade 400 is arranged to be inclined relative to the normal of the circumferential side surface 301 of the second hub 300, and the second blade 400 is a blade with an inclined angle, and the positive direction is the rotation direction of the axial flow blade ( Fig. 9 In this way, the second blade 400 can accelerate the airflow.

[0091] More specifically, please refer to Fig. 9 The included angle between each second blade 400 and the tangent line of the second hub 300 in the circumferential direction is β2, 90°≤β2<180°.

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

[0093] In the embodiment of the present application, the angle between each second blade 400 and the tangent line of the second hub 300 in the circumferential direction is an obtuse angle, which can help the second blade 400 to accelerate the airflow. In other embodiments, the angle between each second blade 400 and the tangent line of the second hub 300 in the circumferential direction can also be an acute angle.

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

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

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

[0097] For further information, please refer to Figure 6 The circumferential side surface 101 of the first hub 100 is arranged at an angle with the first direction, and the angle between the circumferential side surface 101 of the first hub 100 and the first direction is α1, 0°<α1≤90°.

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

[0099] In the embodiment of the present application, the circumferential side surface 101 of the first hub 100 is an inclined plane structure, so that each first blade 200 is conveniently fixed to the circumferential side surface 101 of the first hub 100 .

[0100] Please refer to Figure 1 , an axial flow fan in one embodiment includes the above-mentioned axial flow fan blades.

[0101] It should be noted that the above-mentioned axial flow fan also includes components such as a driving member and an air guide ring. The driving member 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 arranged in the air guide ring.

[0102] In the above-mentioned 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, so that the first air guide channel 210 is a tapered channel that transitions from wide to narrow. The airflow can be accelerated when flowing through the first air guide channel 210, thereby improving the wind speed and wind feeling of the outlet airflow of the axial flow fan blade and effectively reducing the aerodynamic noise.

[0103] Please refer to Figure 1 , the circulation fan in one embodiment includes the above-mentioned axial flow fan.

[0104] It should be noted that the above-mentioned circulation fan also includes components such as a fuselage and a base, and the above-mentioned axial flow fan is installed on the fuselage.

[0105] In the above-mentioned circulation 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, so that the first air guide channel 210 is a tapered channel that transitions from wide to narrow. The airflow can be accelerated when flowing through the first air guide channel 210, which improves the wind speed and wind feeling of the outlet airflow of the axial flow fan blade and effectively reduces the aerodynamic noise.

[0106] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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 above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. An axial flow fan blade, characterized in that: include: first hub (100); At least two first blades (200) are arranged 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) comprises a first air inlet (211) and a first air outlet (212) which are 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 with the first direction, a width δa1 of the first air inlet (211) is greater than a 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 wheel hub (100) further comprises a first air outlet end (120), the first air outlet end (120) being arranged opposite to the first air inlet end (110) along the first direction, the outer diameter of the first air outlet end (120) being D1, and the width of the first air outlet (212) being 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 end (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 blade further comprises 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 of the second blades (400) is arranged between the first hub (100) and the second hub (300); and a second air guide channel (410) is formed between each of the second blades (400).

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

8. The axial flow fan blade according to claim 7, characterized in that: The second wheel hub (300) further comprises a second air outlet end (320), the second air outlet end (320) being arranged opposite to the second air inlet end (310) along the first direction, the outer diameter of the second air outlet end (320) being D2, and the width of the second air outlet (411) being 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 end (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 end (320) is smaller than the outer diameter D1 of the first air outlet end (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 Δ1, the height of the second hub (300) is Δ2, and Δ2≤Δ1.

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: The first blades (200) are evenly distributed along the outer circumference 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: The second blades (400) are evenly distributed along the outer circumference of the second hub (300), the number of the second blades (400) is n1, n<n1≤2n, and the 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 arranged to be inclined relative to a normal line of a 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 tangent lines of each of the second blades (400) and the second hub (300) in the circumferential direction is β2, and 90°≤β2<180°.

17. The axial flow fan blade according to claim 5, characterized in that: The circumferential side surface (301) of the second hub is arranged at an angle with the first direction, and the angle between the circumferential side surface (301) of the second 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 hub is arranged at an angle with the first direction, and the angle between the circumferential side surface (101) of the first hub and the first direction is α1, 0°<α1≤90°.

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

20. A circulating fan, characterized in that: Comprising the axial flow fan as claimed in claim 19.

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