Axial flow fan blade, fan and air conditioner

Abstract

The application relates to an axial flow fan blade, a fan and an air conditioner, and relates to the technical field of air conditioning equipment. The axial flow fan blade comprises a hub and a blade; the blade is arranged in the circumferential direction of the hub, the blade comprises a front edge and a rear edge which are oppositely arranged in the rotating direction of the blade, and airflow enters the front edge and flows to the rear edge; wherein, a bending structure is arranged on the rear edge to form a plurality of airflow flow paths and to split the airflow flowing to the rear edge. The technical scheme disclosed by the application can solve the problems of low working efficiency and large aerodynamic noise of the existing axial flow fan blade.

Description

Technical Field

[0001] This invention relates to the field of air conditioning equipment technology, and particularly to an axial flow fan blade, a fan, and an air conditioner. Background Technology

[0002] With the continuous development of economic construction, air conditioning technology has also made significant progress. Most outdoor units of air conditioners use axial flow fans for heat dissipation, relying on their high-speed rotation to cause the air to flow in a specific direction under the action of the blades, thereby generating a heat dissipation effect.

[0003] Axial flow fans are widely used in air conditioning products due to their large air volume and low noise. The efficiency of axial flow fans and air ducts in air conditioners has a significant impact on the air conditioning's energy efficiency and comfort. However, existing axial flow fans suffer from low operating efficiency and high aerodynamic noise. Summary of the Invention

[0004] This invention provides an axial flow fan blade, a fan, and an air conditioner, which can solve the problems of low working efficiency and high aerodynamic noise of existing axial flow fan blades.

[0005] In a first aspect, embodiments of the present invention provide an axial flow fan blade, comprising:

[0006] Wheel hubs; and

[0007] Blades are arranged circumferentially around the hub. Each blade includes a leading edge and a trailing edge that are opposite to each other along the direction of rotation of the blade. Airflow enters from the leading edge and flows to the trailing edge.

[0008] The trailing edge is provided with a bending structure to form multiple airflow paths and to divert the airflow flowing toward the trailing edge.

[0009] In one embodiment, the blade includes an inner edge and an outer edge disposed opposite to each other along the radial direction of the blade, the inner edge being connected to the leading edge and the trailing edge respectively, and the outer edge being connected to the leading edge and the trailing edge respectively, wherein the inner edge is connected to the hub.

[0010] In one embodiment, the bending structure includes a main bending portion, the main bending portion including at least two recessed sections and a convex section located between two adjacent recessed sections.

[0011] In one embodiment, the projection of the recessed section on a plane perpendicular to the axis of the hub has a sharp angle, which is greater than 5° and less than 90°.

[0012] In one embodiment, the bending structure includes a first bending portion, a second bending portion, a third bending portion, and a fourth bending portion, wherein the first bending portion, the second bending portion, the main bending portion, the third bending portion, and the fourth bending portion are connected in sequence.

[0013] Wherein, the first bending portion is connected to the second bending portion to form a second bending end, the second bending portion is connected to the main bending portion to form a third bending end, the main bending portion is connected to the third bending portion to form a fourth bending end, and the third bending portion is connected to the fourth bending portion to form a fifth bending end;

[0014] The first bending portion has a first bending end, which is connected to the inner edge, and the fourth bending portion has a sixth bending end, which is connected to the outer edge.

[0015] In one embodiment, on the plane passing through the axis of the hub, the projection of the first bend is a straight line segment, and the projection of the first bend has a first preset angle with the axis of the hub.

[0016] Wherein, the first preset included angle is greater than 0° and less than 90°.

[0017] In one embodiment, the projection of the second bend is a straight line segment on a plane perpendicular to the axis of the hub;

[0018] Wherein, the line connecting the projection of the second bent end and the center of the hub has a second preset angle with the projection of the second bent portion, the second preset angle being greater than 0° and less than 75°.

[0019] In one embodiment, the projection of the third bend is a straight line segment on a plane perpendicular to the axis of the hub.

[0020] Wherein, the line connecting the projection of the fifth bend end and the center of the hub has a third preset angle with the projection of the third bend, the third preset angle being greater than 0° and less than 90°.

[0021] In one embodiment, the projection of the fourth bend is a straight line segment on a plane perpendicular to the axis of the hub.

[0022] Wherein, the line connecting the projection of the fifth bend end and the center of the hub has a fourth preset angle with the projection of the fourth bend, the fourth preset angle being greater than 0° and less than 90°.

[0023] In one embodiment, on a plane perpendicular to the axis of the hub, the line connecting the projection of the third bend and the projection of the fourth bend passes through the projection of the vertex of the convex section, the projection of the bottom of the concave section is on the same straight line, and the line has a fifth preset angle with the line connecting the projection of the third bend and the projection of the fourth bend, the fifth preset angle being greater than 5° and less than 30°.

[0024] In one embodiment, on a plane perpendicular to the axis of the hub, the distance between the projection of the first bent end and the center of the hub is a first preset radius R1, the distance between the projection of the second bent end and the center of the hub is a second preset radius R2, the distance between the projection of the third bent end and the center of the hub is a third preset radius R3, the distance between the projection of the fourth bent end and the center of the hub is a fourth preset radius R4, the distance between the projection of the fifth bent end and the center of the hub is a fifth preset radius R5, and the distance between the projection of the sixth bent portion and the center of the hub is a sixth preset radius R6.

[0025] The radius of the wheel hub is equal to the first preset radius, the radius of the outer edge is equal to the sixth preset radius, and R1 < R2 < R3 < R4 < R5 < R6.

[0026] In one embodiment, the average of the radius of the hub and the radius of the outer edge is a reference radius Rm, and the fourth preset radius R4 and the reference radius Rm satisfy the following relationship: 0.75Rm < R4 < 1.25Rm.

[0027] In one embodiment, on a plane perpendicular to the axis of the hub, along the rotation direction, the projections of the first bend and the second bend are both located behind the line connecting the fifth bend and the center of the hub, while the main bend, the third bend, and the fourth bend are all located in front of the line connecting the fifth bend and the center of the hub.

[0028] In a second aspect, embodiments of the present invention provide a fan, including axial flow fan blades as described in the first aspect.

[0029] Thirdly, embodiments of the present invention provide an air conditioner including the fan described in the second aspect.

[0030] Compared with existing technologies, the advantages of this invention lie in that by setting a bending structure on the trailing edge, multiple airflow paths are provided for the airflow, which acts as a diversion mechanism to change the distribution of vortices and reduce their intensity. This reduces aerodynamic noise, drag, and noise, thereby improving the comfort of air conditioning use. Simultaneously, the multiple airflow paths formed by the bending structure have different lengths, and the time required for the airflow to travel on each path is also different. This results in inconsistent airflow separation times on each path, reducing the simultaneous occurrence of airflow separation, improving radial airflow disturbance, and increasing the efficiency of the axial fan blades. Under the same airflow volume, the input power of the fan blades decreases, thereby reducing the power consumption of the air conditioner and improving its energy efficiency. Attached Figure Description

[0031] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0032] Figure 1 This is a front view of an axial flow fan blade provided in an embodiment of the present invention;

[0033] Figure 2 yes Figure 1 Left view of the axial flow fan blade provided in the embodiment;

[0034] Figure 3 yes Figure 1 A schematic diagram of the fifth and sixth preset included angles of the axial flow fan blades provided in the Chinese embodiment;

[0035] Figure 4 yes Figure 1 Rear view of the axial flow fan blade provided in the embodiment.

[0036] Figure label:

[0037] 10. Wheel hub; 110. First side; 120. Second side;

[0038] 20. Leaf blade; 210. Leading edge; 220. Trailing edge; 230. Inner edge; 240. Outer edge;

[0039] 30. Bending structure; 310. First bending section; 320. Second bending section; 330. Main bending section; 3301. Concave section; 3302. Convex top section; 340. Third bending section; 350. Fourth bending section. Detailed Implementation

[0040] The invention will now be further described with reference to the accompanying drawings.

[0041] Axial flow fans are widely used in air conditioning products due to their large air volume and low noise. The efficiency of axial flow fans and air ducts in air conditioners has a significant impact on the air conditioning's energy efficiency and comfort. However, existing axial flow fans suffer from low operating efficiency and high aerodynamic noise.

[0042] To solve the above-mentioned technical problems, at least one embodiment of the present invention provides an axial flow fan blade, including a hub 10 and blades 20; the blades 20 are arranged circumferentially around the hub 10, and the blades 20 include a leading edge 210 and a trailing edge 220 arranged opposite to each other along the rotation direction of the blades 20, and the airflow enters from the leading edge 210 and flows to the trailing edge 220; wherein, a bending structure 30 is provided on the trailing edge 220 to form multiple airflow paths and to divert the airflow flowing to the trailing edge 220.

[0043] As can be seen from the above, by setting the bending structure 30 on the trailing edge 220, multiple airflow paths are provided for the airflow, which plays a role in diverting the flow, changing the distribution of vortices, reducing vortex intensity, thereby reducing aerodynamic noise, drag reduction, and noise reduction, and improving the comfort of air conditioning use. At the same time, the multiple airflow paths formed by the bending structure 30 have different lengths, and the time required for the airflow to travel on each airflow path is also different, so that the time of airflow separation on each airflow path is inconsistent, thereby reducing the simultaneous occurrence of airflow separation, improving radial disturbance of the airflow, improving the efficiency of the axial fan blades, and reducing the input power of the fan blades under the same air volume, thereby reducing the power of the air conditioner and improving the energy efficiency of the air conditioner.

[0044] like Figure 1 , Figure 2 As shown, the axial flow fan blade includes a hub 10 and blades 20. The blades 20 are arranged circumferentially around the hub 10. The blades 20 include a leading edge 210 and a trailing edge 220 that are arranged opposite to each other along the rotation direction of the blades 20. The airflow enters from the leading edge 210 and flows to the trailing edge 220. The trailing edge 220 is provided with a bending structure 30 to form multiple airflow paths and to divert the airflow flowing to the trailing edge 220.

[0045] It should be noted that the number of blades 20 is multiple, and the specific number is set according to needs. For example, as Figure 1 As shown, there are three blades 20, which are arranged circumferentially around the hub 10.

[0046] It should also be noted that when the axial fan blades rotate, the blades 20 rotate with the hub 10, doing work on the gas and causing the airflow to flow from the leading edge 210 to the trailing edge 220. When the airflow flows to the trailing edge 220, part of the airflow is affected by centrifugal force and flows radially towards the outer edge 240 of the blades 20. This part of the airflow will disturb the axial airflow and develop into vortices, generating aerodynamic noise on the surface of the blades 20, reducing the efficiency of the axial fan blades, decreasing the air volume, and increasing the power of the air conditioner when the same air volume is generated.

[0047] This invention, by setting a bending structure 30 on the trailing edge 220, provides multiple airflow paths for the airflow, thus acting as a diversion mechanism to change the distribution and intensity of vortices. This reduces aerodynamic noise, drag, and noise, improving the comfort of air conditioning use. Simultaneously, by setting the bending structure 30, multiple airflow paths of varying lengths are formed, ensuring that the time required for airflow along each path is different. This causes airflow separation to occur at inconsistent times, reducing simultaneous airflow separation, improving radial disturbance of the airflow, and increasing the efficiency of the axial fan blades. Under the same airflow volume, the input power of the fan blades decreases, thereby reducing the power consumption of the air conditioner and improving its energy efficiency.

[0048] For example, such as Figure 4 As shown, when the airflow path is L0, the airflow separates at the outer edge 240, forming a tip vortex.

[0049] The bent structure 30 can form airflow paths L1-1, L1-2, L2-1, L2-2, L3-1, and L3-2. The lengths of the airflow paths are different, and the required flow time is also different. Therefore, the time when airflow separation occurs on each airflow path is also different. Some paths occur earlier, and some paths occur later. This reduces the simultaneous occurrence of airflow separation, thereby reducing radial disturbance of the airflow, reducing vortex intensity, and solving the problems of low working efficiency and high aerodynamic noise of axial flow fan blades.

[0050] like Figure 1 As shown, in some embodiments, the blade 20 includes an inner edge 230 and an outer edge 240 disposed opposite to each other in the radial direction of the blade 20. The inner edge 230 is connected to the leading edge 210 and the trailing edge 220 respectively, and the outer edge 240 is connected to the leading edge 210 and the trailing edge 220 respectively. The inner edge 230 is connected to the hub 10.

[0051] It should be noted that on the plane perpendicular to the axis of the hub 10, the projections of the inner edge 230 and the outer edge 240 are both arcs.

[0052] like Figures 1-3As shown, in some embodiments, the bending structure 30 includes a first bending portion 310, a second bending portion 320, a main bending portion 330, a third bending portion 340, and a fourth bending portion 350 connected in sequence. The first bending portion 310 is connected to the second bending portion 320 to form a second bending end, the second bending portion 320 is connected to the main bending portion 330 to form a third bending end, the main bending portion 330 is connected to the third bending portion 340 to form a fourth bending end, and the third bending portion 340 is connected to the fourth bending portion 350 to form a fifth bending end. The first bending portion 310 has a first bending end that is connected to the inner edge 230, and the fourth bending portion 350 has a sixth bending end that is connected to the outer edge 240.

[0053] The first bend 310, the second bend 320, the main bend 330, the third bend 340 and the third bend 340 provide a structural basis for forming multiple airflow paths.

[0054] like Figures 1-3 As shown, the first bend 310 is AB, the second bend 320 is BC, the main bend 330 is CD, the third bend 340 is DE, and the fourth bend 350 is EF; the first bend end is end A, the second bend end is end B, the third bend end is end C, the fourth bend end is end D, the fifth bend end is end E, and the sixth bend end is end F.

[0055] like Figure 2 As shown, in some embodiments, on the plane passing through the axis of the hub 10, the projection of the first bend 310 is a straight line segment, and the projection of the first bend 310 has a first preset angle with the axis of the hub 10; wherein, the first preset angle is greater than 0° and less than 90°.

[0056] It should be noted that, as Figure 2 As shown, the axis of the hub 10 is G, and the first preset included angle is θ1.

[0057] It should also be noted that, such as Figure 2 As shown, the hub 10 includes a first side 110 and a second side 120 arranged opposite each other in the axial direction. On the plane passing through the axis of the hub 10, the distance between the end of the first bend 310 away from the hub 10 and the second side 120 is greater than the distance between the end of the first bend 310 close to the hub 10 and the second side 120.

[0058] like Figure 1 As shown, in some embodiments, the projection of the second bend 320 on a plane perpendicular to the axis of the hub 10 is a straight line segment; wherein, the line connecting the projection of the second bend end and the center of the hub 10 has a second preset angle with the projection of the second bend 320, the second preset angle being greater than 0° and less than 75°.

[0059] By limiting the second preset angle to be greater than 0° and less than 75°, and controlling the chord length corresponding to the airfoil at different radii of the second bend 320, the length of the path of airflow from the leading edge 210 to the second bend 320 is controlled, thereby controlling the flow time and providing a structural basis for reducing the simultaneous occurrence of airflow separation. The larger the second preset angle, the shorter the chord length, the shorter the path, and the shorter the flow time.

[0060] It should be noted that, as Figure 1 As shown, on a plane perpendicular to the axis of hub 10, the center of hub 10 is point O, and the line connecting the projection of the second bend end and the center of hub 10 is BO. The second preset angle is the angle between BO and BC, i.e., θ2.

[0061] like Figure 4 As shown, when the airflow path is L3, due to the first bend 310 and the second bend 320 on the trailing edge 220, a portion of the airflow flowing in from the leading edge 210 along the airflow path L3 flows to the first bend 310 to form airflow path L3-1, and the other portion flows to the second bend 320 to form airflow path L3-2, thereby achieving vortex splitting and reducing the disturbance effect of vortices. In addition, since the lengths of airflow path L3-1 and airflow path L3-2 are different, the time required for the airflow to flow from airflow path L3-1 and airflow path L3-2 to the intake surface is also different, reducing the simultaneous occurrence of airflow separation, improving the pressure gradient at the trailing edge 220 of the blade 20, making the pressure distribution more reasonable, thereby preventing the airflow from flowing radially, reducing radial interference of the airflow, reducing vortex intensity, and achieving the effect of drag reduction and noise reduction.

[0062] like Figure 1 As shown, in some embodiments, the projection of the third bend 340 on a plane perpendicular to the axis of the hub 10 is a straight line segment; wherein, the line connecting the projection of the fifth bend end and the center of the hub 10 has a third preset angle with the projection of the third bend 340, the third preset angle being greater than 0° and less than 90°.

[0063] By setting a third preset angle greater than 0° and less than 90°, the chord length corresponding to the airfoil at different radii of the third bend 340 is controlled, thereby controlling the length of the airflow path from the leading edge 210 to the third bend 340, controlling the flow time, and providing a structural basis for reducing the simultaneous occurrence of airflow separation.

[0064] It should be noted that, as Figure 1 As shown, on a plane perpendicular to the axis of the hub 10, the line connecting the projection of the fifth bend end and the center of the hub 10 is EO, and the third preset angle is the angle between EO and ED, i.e., θ3.

[0065] like Figure 1 As shown, in some embodiments, the projection of the fourth bend 350 on a plane perpendicular to the axis of the hub 10 is a straight line segment; wherein, the line connecting the projection of the fifth bend end and the center of the hub 10 has a fourth preset angle with the projection of the fourth bend 350, the fourth preset angle being greater than 0° and less than 90°.

[0066] By setting a fourth preset angle greater than 0° and less than 90°, the chord length corresponding to the airfoil at different radii of the fourth bend 350 is controlled, thereby controlling the length of the path of the airflow from the leading edge 210 to the fourth bend 350, controlling the flow time, and providing a structural basis for reducing the simultaneous occurrence of airflow separation.

[0067] It should be noted that, as Figure 1 As shown, on a plane perpendicular to the axis of the hub 10, the line connecting the projection of the fifth bend end and the center of the hub 10 is EO, and the fourth preset angle is the angle between EO and EF, i.e., θ4.

[0068] By limiting the angles of the first preset angle, the second preset angle, the third preset angle, and the fourth preset angle, the shape characteristics of the blade 20 are determined, thereby affecting the performance of the axial flow fan blade.

[0069] like Figure 4 As shown, when the airflow path is L1, due to the third bend 340 and the fourth bend 350 on the trailing edge 220, part of the airflow flowing in from the leading edge 210 along the airflow path L1 flows to the third bend 340 to form airflow path L1-1, and the other part flows to the fourth bend 350 to form airflow path L1-2, thereby achieving vortex splitting and reducing the disturbance effect of vortices. In addition, since the lengths of airflow path L1-1 and airflow path L1-2 are different, the time required for the airflow to flow from airflow path L1-1 and airflow path L1-2 to the intake surface is also different, reducing the simultaneous occurrence of airflow separation, improving the pressure gradient at the trailing edge 220 of the blade 20, making the pressure distribution more reasonable, thereby preventing the airflow from flowing radially, reducing radial interference of the airflow, reducing vortex intensity, and achieving the effect of drag reduction and noise reduction.

[0070] like Figure 1 , Figure 3 As shown, in some embodiments, the main bend 330 includes at least two recessed sections 3301 and a convex section 3302 located between two adjacent recessed sections 3301.

[0071] By setting the concave section 3301, the radial flow direction of the vortex is changed, causing the vortex to split and preventing it from flowing in one direction, thus inhibiting vortex intensification and reducing vortex intensity and size, achieving drag reduction and noise reduction effects. By setting at least two concave sections 3301, it is possible to accommodate vortices of various sizes, reduce vortices of different sizes, and disperse vortices of various sizes, thereby further improving the drag reduction and noise reduction effect.

[0072] It should be noted that as eddies decrease in size during flow, they dissipate continuously, resulting in eddies of various sizes, which are the main sources of drag and noise.

[0073] It should also be noted that the specific number of recessed sections 3301 is set according to actual needs. For example, such as Figure 1 As shown, there are three concave sections 3301.

[0074] like Figure 1 , Figure 3 As shown, in some embodiments, on a plane perpendicular to the axis of the hub 10, the line connecting the projection of the third bend end and the projection of the fourth bend end passes through the projection of the vertex of the convex section 3302, and the projection of the bottom of the concave section 3301 is on the same straight line. The line has a fifth preset angle with the line connecting the projection of the third bend end and the projection of the fourth bend end. The fifth preset angle is greater than 5° and less than 30°.

[0075] By limiting the projection of the third bend end and the projection of the fourth bend end to pass through the projection of the vertex of the convex section 3302, the concave section 3301 of the main bend 330 changes approximately linearly, thereby achieving perturbation of eddies at multiple scales.

[0076] It should be noted that, as Figure 3 As shown, the projection of the bottom of the concave section 3301 is located on the straight line H, with the fifth preset included angle being θ5 and the sharp angle being θ6.

[0077] like Figure 1 , Figure 3 As shown, in some embodiments, the projection of the recessed section 3301 on a plane perpendicular to the axis of the hub 10 has a sharp angle, which is greater than 5° and less than 90°. The size and linear variation of the recessed section 3301 are controlled by limiting the fifth preset angle and the size of the sharp angle.

[0078] like Figure 4As shown, when the airflow path is L2, since the main bend 330 has at least two recessed sections 3301, part of the airflow flowing in from the leading edge 210 along the airflow path L2 flows to one of the recessed sections 3301 to form airflow path L2-1, and the other part flows to the other recessed section 3301 to form airflow path L2-2, thereby achieving vortex splitting and reducing the disturbance effect of vortices. In addition, since the lengths of airflow path L2-1 and airflow path L2-2 are different, the time required for the airflow to flow from airflow path L2-1 and airflow path L2-2 to the intake surface is also different, reducing the simultaneous occurrence of airflow separation, improving the pressure gradient at the trailing edge 220 of the blade 20, making the pressure distribution more reasonable, thereby preventing the airflow from flowing radially, reducing radial interference of the airflow, reducing vortex intensity, and achieving the effect of drag reduction and noise reduction.

[0079] like Figure 1 As shown, in some embodiments, on a plane perpendicular to the axis of the hub 10, the distance between the projection of the first bent end and the center of the hub 10 is a first preset radius R1, the distance between the projection of the second bent end and the center of the hub 10 is a second preset radius R2, the distance between the projection of the third bent end and the center of the hub 10 is a third preset radius R3, the distance between the projection of the fourth bent end and the center of the hub 10 is a fourth preset radius R4, the distance between the projection of the fifth bent end and the center of the hub 10 is a fifth preset radius R5, and the distance between the projection of the sixth bent end and the center of the hub 10 is a sixth preset radius R6; wherein, the radius of the hub 10 is equal to the first preset radius, the radius of the outer edge 240 is equal to the sixth preset radius, and R1 < R2 < R3 < R4 < R5 < R6.

[0080] The radii of the projections of the first, second, third, fourth, fifth, and sixth bends are related to the centrifugal force. The larger the radius, the greater the centrifugal force, which may lead to more obvious airflow disturbance, stronger vortices, and greater noise. By limiting the relationship R1 < R2 < R3 < R4 < R5 < R6, together with each bend and the concave section 3301, the trailing edge 220 feature is formed, which is beneficial to the drag reduction and noise reduction of the axial flow fan blades.

[0081] like Figure 1 As shown, in some embodiments, the average of the radius of the hub 10 and the radius of the outer edge 240 is a reference radius Rm, where 0.75Rm < R4 < 1.25Rm.

[0082] The size of the fourth preset radius R4 is limited by setting a reference radius, thereby limiting the positional relationship between the fourth bend end and the hub 10 and the outer edge 240. When the fourth preset radius R4 is less than the reference radius Rm, the fourth bend end is closer to the hub 10. When the fourth preset radius R4 is greater than the reference radius Rm, the fourth bend end is closer to the outer edge 240. Meanwhile, the fourth preset radius R4 is set to be greater than 0.75Rm and less than 1.25Rm. This avoids the fourth preset radius R4 being too small, which would result in the airfoil chord length of each blade of the first bend 310 and the second bend 320 being too short, making the improvement effect of the first bend 310 and the second bend 320 on the vortex too obvious. It also avoids the fourth preset radius R4 being too large, which would cause the main bend 330, the third bend 340 and the fourth bend 350 to be located close to the outer edge, and the airflow near Rm would be subject to relatively large centrifugal force. The airflow would flow radially towards the outer edge 240 of the blade 20, resulting in an insignificant improvement effect on the vortex near Rm, increased fan power and enhanced aerodynamic noise.

[0083] like Figure 1 As shown, in some embodiments, on a plane perpendicular to the axis of the hub 10, along the rotation direction, the projections of the first bend 310 and the second bend 320 are both located behind the line connecting the fifth bend end and the center of the hub 10, while the main bend 330, the third bend 340, and the fourth bend 350 are all located in front of the line connecting the fifth bend end and the center of the hub 10.

[0084] It should be noted that, as Figure 1 As shown, the line connecting the fifth bend end and the center of the hub 10 is EO.

[0085] At least one embodiment of the present invention also provides a fan, including axial flow fan blades of any embodiment of the present invention, thereby having all the technical effects brought about by the technical solutions of the above embodiments.

[0086] At least one embodiment of the present invention also provides an air conditioner, including a fan according to any embodiment of the present invention, thereby having all the technical effects brought about by the technical solutions of the above embodiments.

[0087] In the description of this invention, 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," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention 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 the invention. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, "above" or "below" a second feature may include direct contact between the first and second features, or it may include contact between the first and second features not being in direct contact but through another feature between them.

[0088] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0089] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0090] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0091] Although the invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An axial flow fan blade, characterized in that, include: Wheel hub; as well as Blades are arranged circumferentially around the hub. Each blade includes a leading edge and a trailing edge that are opposite to each other along the direction of rotation of the blade. Airflow enters from the leading edge and flows to the trailing edge. The trailing edge is provided with a bending structure to form multiple airflow paths and to divert the airflow flowing toward the trailing edge; The blade includes an inner edge and an outer edge that are disposed opposite to each other along the radial direction of the blade. The inner edge is connected to the leading edge and the trailing edge, respectively, and the outer edge is connected to the leading edge and the trailing edge, respectively. The inner edge is connected to the hub. The bending structure includes a main bending portion, which includes at least two recessed sections and a convex section located between two adjacent recessed sections. The bending structure includes a first bending portion, a second bending portion, a third bending portion, and a fourth bending portion, wherein the first bending portion, the second bending portion, the main bending portion, the third bending portion, and the fourth bending portion are connected in sequence; Wherein, the first bending portion is connected to the second bending portion to form a second bending end, the second bending portion is connected to the main bending portion to form a third bending end, the main bending portion is connected to the third bending portion to form a fourth bending end, and the third bending portion is connected to the fourth bending portion to form a fifth bending end; The first bending portion has a first bending end, which is connected to the inner edge; the fourth bending portion has a sixth bending end, which is connected to the outer edge. On a plane perpendicular to the axis of the hub, the line connecting the projection of the third bend and the projection of the fourth bend passes through the projection of the vertex of the convex section, the projection of the bottom of the concave section is on the same straight line, and the line connecting the projection of the third bend and the projection of the fourth bend has a fifth preset angle, which is greater than 5° and less than 30°. On a plane perpendicular to the axis of the hub, along the rotation direction, the projections of the first bend and the second bend are both located behind the line connecting the fifth bend and the center of the hub, while the main bend, the third bend, and the fourth bend are all located in front of the line connecting the fifth bend and the center of the hub.

2. The axial flow fan blade according to claim 1, characterized in that, On a plane perpendicular to the axis of the hub, the projection of the recessed section has a sharp angle, which is greater than 5° and less than 90°.

3. The axial flow fan blade according to claim 1, characterized in that, On the plane passing through the axis of the hub, the projection of the first bend is a straight line segment, and there is a first preset angle between the projection of the first bend and the axis of the hub. Wherein, the first preset included angle is greater than 0° and less than 90°.

4. The axial flow fan blade according to claim 1, characterized in that, On a plane perpendicular to the axis of the hub, the projection of the second bend is a straight line segment; Wherein, the line connecting the projection of the second bent end and the center of the hub has a second preset angle with the projection of the second bent part, the second preset angle being greater than 0° and less than 75°.

5. The axial flow fan blade according to claim 1, characterized in that, On a plane perpendicular to the axis of the hub, the projection of the third bend is a straight line segment; Wherein, the line connecting the projection of the fifth bend end and the center of the hub has a third preset angle with the projection of the third bend, the third preset angle being greater than 0° and less than 90°.

6. The axial flow fan blade according to claim 1, characterized in that, On a plane perpendicular to the axis of the hub, the projection of the fourth bend is a straight line segment; Wherein, the line connecting the projection of the fifth bend end and the center of the hub has a fourth preset angle with the projection of the fourth bend, the fourth preset angle being greater than 0° and less than 90°.

7. The axial flow fan blade according to any one of claims 1, characterized in that, On a plane perpendicular to the axis of the wheel hub, the distance between the projection of the first bent end and the center of the wheel hub is a first preset radius R1, the distance between the projection of the second bent end and the center of the wheel hub is a second preset radius R2, the distance between the projection of the third bent end and the center of the wheel hub is a third preset radius R3, the distance between the projection of the fourth bent end and the center of the wheel hub is a fourth preset radius R4, the distance between the projection of the fifth bent end and the center of the wheel hub is a fifth preset radius R5, and the distance between the projection of the sixth bent end and the center of the wheel hub is a sixth preset radius R6. The radius of the wheel hub is equal to the first preset radius, the radius of the outer edge is equal to the sixth preset radius, and R1 < R2 < R3 < R4 < R5 < R6.

8. The axial flow fan blade according to claim 7, characterized in that, The average of the radius of the hub and the radius of the outer edge is the reference radius Rm. The fourth preset radius R4 and the reference radius Rm satisfy the following relationship: 0.75Rm < R4 < 1.25Rm.

9. A fan, characterized in that, Includes the axial flow fan blades as described in any one of claims 1-8.

10. An air conditioner, characterized in that, Including the wind turbine as described in claim 9.

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