Fan blade and blowing device

Abstract

The utility model discloses a fan blade and an air blowing device, and the fan blade comprises a hub which is connected with a fan motor; the plurality of blades are arranged on the outer surface of the hub in a surrounding manner; the fan cover is arranged on the multiple blades in a covering mode, and the blade edges of the multiple blades are connected with the fan cover. A fan cover is arranged, the fan cover covers the fan blades, and the blade edges of the fan blades are connected with the fan cover. Due to the arrangement of the fan cover, an air duct structure with the closed side edge is formed between the hub and the fan cover, and by means of the structure, when fan blades push airflow to rotate, the side wall of the fan cover can block and counteract centrifugal force received by the airflow, the phenomenon that the airflow flowing through the fan blades overflows under the action of the centrifugal force is avoided, and the service life of the fan is prolonged. And the air outlet efficiency and the air outlet quantity of the fan blades are improved.

Description

Technical Field

[0001] The present application relates to the field of fans, and in particular to a fan blade and a blowing device. Background Art

[0002] In the hot summer, fans have become a must-have item for people to eliminate the heat. With the improvement of people's quality of life, the requirements for various performances of fan products, such as noise, air volume, etc., are getting higher and higher.

[0003] As the core component of the fan, the fan blade plays a vital role in the overall performance of the fan. The fan blades in the prior art usually include: a hub and blades arranged on the surface of the hub. The inventors of the present invention found in their research that during the rotation of the existing fan blades, the airflow is driven to rotate synchronously. Part of the rotating airflow will separate from the fan blades under the action of centrifugal force and collide with the side wall of the fan housing. The colliding airflow will generate an airflow vortex, which will interfere with the normal airflow flowing in the fan blades. The airflow that separates from the fan blades and the generated airflow vortex will reduce the air outlet efficiency of the fan blades. Utility Model Content

[0004] The purpose of the present application is to provide a fan blade and a blowing device that can prevent the airflow in the fan blade from overflowing under the action of centrifugal force.

[0005] The present application provides a fan blade, comprising:

[0006] a wheel hub, the wheel hub being connected to the fan motor;

[0007] A plurality of blades, the plurality of blades are disposed on an outer surface of the hub in a surrounding manner;

[0008] A fan cover is provided on the plurality of blades, and blade edges of the plurality of blades are connected to the fan cover.

[0009] Optionally, each of the plurality of blades is bent and extended along the hub surface from the top end of the hub to the edge of the side, and each of the blades is in a twisted shape; and / or,

[0010] The hub is configured to be conical or truncated cone-shaped; and / or,

[0011] The fan cover is respectively provided with a first opening and a second opening along the air inlet direction of the fan blades, and an opening area of ​​the second opening is larger than an opening area of ​​the first opening.

[0012] Optionally, the fan cover includes: an air inlet ring and an air guide cover, the air inlet ring is connected to the air guide cover, the first opening is opened on the air inlet ring, and the second opening is opened on the air guide cover.

[0013] Optionally, the thickness of the air inlet ring gradually increases in the opposite direction of the air inlet direction of the fan blades; or,

[0014] The thickness of the air inlet ring gradually increases along the opposite direction of the air inlet direction of the fan blades to a maximum and then gradually decreases.

[0015] Optionally, the outer surface of the air deflector is raised at a position adjacent to the second opening to form an annular retaining edge.

[0016] Optionally, each of the plurality of blades comprises: a blade tip, the direction in which the blade tip faces is the same as the rotation direction of the fan blade; and / or,

[0017] Each of the plurality of blades comprises a blade tip, and an angle between an extension line of a direction in which the blade tip points and a horizontal direction is an acute angle.

[0018] Optionally, a wind-cutting inclined plane is provided at the position of the blade tip, and the wind-cutting inclined plane extends in the opposite direction to the rotation direction of the fan blade; and / or,

[0019] The angle between the blade tip and the blade edge is an acute angle; and / or,

[0020] Each of the plurality of blades includes a blade tail, and the blade tail is bent and extends in a direction opposite to a rotation direction of the fan blade.

[0021] Optionally, the wind-cutting slope comprises: a curved portion and a linear portion, one end of the linear portion is connected to the hub surface, the other end of the linear portion is connected to the curved portion, and the other end of the curved portion is connected to the blade edge; and / or,

[0022] The length of the blade tip is greater than the length of the blade tail; and / or,

[0023] At least one arc-shaped notch is arranged at the blade tail.

[0024] Optionally, the connection position between the curved portion and the blade edge is configured to form an acute angle; and / or,

[0025] When two or more arc-shaped notches are provided at the blade tail, an arc-shaped protrusion is provided between two adjacent arc-shaped notches, and the arc-shaped protrusion is in the opposite direction to the arc-shaped notch; and / or,

[0026] When two or more arc-shaped notches are provided at the blade tail, the area of ​​the arc-shaped notches gradually decreases along the direction from the hub to the fan cover.

[0027] To achieve the purpose of the present application, an embodiment of the present application further provides a blowing device, which is assembled with fan blades as described in any one of the above items.

[0028] The beneficial effect of the embodiment of the present application is: a fan cover is provided, the fan cover is provided on the fan blade, and the blade edge of the fan blade is connected to the fan cover. The setting of the fan cover forms a side-closed air duct structure between the hub and the fan cover, and the structure enables the side wall of the fan cover to block and offset the centrifugal force received by the airflow when the fan blade pushes the airflow to rotate, avoiding the phenomenon of the airflow flowing through the fan blade overflowing under the action of the centrifugal force, thereby improving the air outlet efficiency and air volume of the fan blade. At the same time, since the overflow channel of the fan blade is limited by the fan cover, the rotating overflow airflow cannot form an airflow vortex that affects the rotation of the fan blade, thereby avoiding the aerodynamic noise formed by the airflow vortex, and can greatly reduce the aerodynamic noise of the fan blade. Further, due to the cover of the fan cover, the blade edge of the fan blade does not need to rub and collide with the airflow in the fan blade, thereby reducing the rotation resistance of the fan blade, making the rotation efficiency of the fan blade higher, and can also avoid the aerodynamic noise generated by the friction between the blade edge and the airflow, thereby further reducing the aerodynamic noise of the fan blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0030] Figure 1 This is a schematic diagram of the overall structure of a fan blade according to a specific embodiment of the present application;

[0031] Figure 2 This is a schematic structural diagram of a fan blade from a first perspective of a specific embodiment of the present application;

[0032] Figure 3 A schematic cross-sectional view of a fan blade according to a specific embodiment of the present application;

[0033] Figure 4 This is a schematic structural diagram of a hub and blades of a specific embodiment of the present application;

[0034] Figure 5 This is a structural schematic diagram of the hub, blades, directions and schematic angles of a specific embodiment of the present application.

[0035] Description of the drawings: 1. Hub; 11. Top end; 12. Edge position; 2. Blade; 21. Blade edge; 22. Blade tip; 23. Blade tail; 231. Arc-shaped notch; 232. Arc-shaped protrusion; 24. Wind-cutting slope; 241. Curved portion; 242. Linear portion; 3. Fan cover; 31. First opening; 32. Second opening; 33. Air inlet ring; 34. Air guide cover; 35. Annular baffle. DETAILED DESCRIPTION

[0036] In order to facilitate the understanding of the utility model, the utility model is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements between them. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements between them. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this specification are for illustrative purposes only.

[0037] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by technicians in the technical field of the present invention. The terms used in this specification are only for the purpose of describing specific embodiments and are not used to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0038] Example 1

[0039] See also Figure 1 and Figure 2 , Figure 1 is a schematic diagram of the three-dimensional structure of the fan blades of this embodiment; Figure 2 This is a schematic structural diagram of the fan blades of this embodiment from a first viewing angle.

[0040] like Figure 1 and Figure 2 As shown, a fan blade comprises: a hub 1, a plurality of blades 2 and a fan cover 3. The hub 1 is connected to a fan motor; the plurality of blades 2 are arranged around the outer surface of the hub 1; the fan cover 3 is covered on the plurality of blades 2, and the blade edges 21 of the plurality of blades 2 are connected to the fan cover 3.

[0041] In this embodiment, the overall shape of the wheel hub 1 is configured as a truncated cone. However, the overall shape of the wheel hub 1 is not limited thereto, and in some embodiments, the overall shape of the wheel hub 1 can be configured as a cone, a bullet, a hemispherical, a cylindrical, etc., depending on the specific application scenario.

[0042] The number of blades 2 in this embodiment is 9, but the number of blades 2 is not limited to this. Depending on the specific application scenario, in some embodiments, the number of blades 2 can be (not limited to): 2, 3, 4, 5, 6, 7, 8, 10, 11 or more.

[0043] In this embodiment, the inner surface of the fan cover 3 is connected to the blade edge 21 of the blade 2, and the connection method of the blade edge 21 and the inner surface of the fan cover 3 is: hot melt connection; a hot melt connection process that can be used is: ultrasonic hot melt connection. However, the connection method between the fan cover 3 and the blade edge 21 is not limited to this. According to different specific application scenarios, in some embodiments, the connection method between the blade edge 21 and the inner surface of the fan cover 3 is (not limited to): gluing, welding, clamping, slot connection, etc.

[0044] In the above embodiment, a fan cover 3 is provided, and the fan cover 3 is provided on the fan blade 2, and the blade edge 21 of the fan blade 2 is connected to the fan cover 3. The provision of the fan cover 3 forms a side-enclosed air duct structure between the hub 1 and the fan cover 3, and this structure enables the side wall of the fan cover 3 to block and offset the centrifugal force received by the airflow when the fan blades push the airflow to rotate, thereby avoiding the airflow flowing through the fan blades from overflowing under the action of the centrifugal force, thereby improving the air outlet efficiency and air volume of the fan blades. At the same time, since the overflow channel of the fan blades is limited by the fan cover 3, the rotating overflow airflow cannot form an airflow vortex that affects the rotation of the fan blades, thereby avoiding the aerodynamic noise formed by the airflow vortex, and can greatly reduce the aerodynamic noise of the fan blades. Furthermore, due to the covering design of the fan cover 3, the blade edge 21 of the fan blade does not need to rub and collide with the airflow in the fan blade, thereby reducing the rotation resistance of the fan blade, making the rotation efficiency of the fan blade higher, and avoiding the aerodynamic noise generated by the friction between the blade edge 21 and the airflow, thereby further reducing the aerodynamic noise of the fan blade.

[0045] In some embodiments, each of the multiple blades 2 is bent and extended from the top end 11 of the hub 1 to the side edge position 12 along the surface of the hub 1, and each blade 2 is in a twisted shape. The blade 2 of the fan blade pushes the airflow to rotate during rotation, so the airflow movement path in the fan blade is curved, and each blade 2 is bent and extended from the top end 11 of the hub 1 to the side edge position 12, so that the shape of the blade 2 can fit the curved path of the airflow movement, so that the air pushing efficiency and air guiding efficiency of the fan blade are significantly improved. When the fan blade rotates, the effect of each position of the blade 2 on the airflow is different. For example, at the tip 22 position, the main function of the blade 2 is to cut the wind, at the tip 22 and the tail 23 position, it is used to guide the wind, and at the tail 23 position, it is mainly used to discharge the wind. Since the function of each position of blade 2 is different, the shape of blade 2 is also different at each position. For example, at the tip 22 position, blade 2 is required to point to the direction of rotation of the fan blade to facilitate cutting the wind; at the position between the tip 22 and the tail 23, the vertical distance between blade 2 and hub 1 is required to be larger to facilitate receiving and intercepting more airflow; and at the tail 23, blade 2 is required to extend in the opposite direction of the fan blade rotation direction D1 to reduce the friction between blade 2 and the outflowing airflow, thereby reducing the aerodynamic wind noise and rotation resistance of the fan blade. The twisted shape of blade 2 can meet the actual use requirements of different positions, improve the air outlet efficiency of the fan blade, and reduce the aerodynamic wind noise of the fan blade.

[0046] The hub 1 is configured to be conical or truncated cone. The fan cover 3 is provided with a first opening 31 and a second opening 32 along the air inlet direction D2 of the fan blades, and the opening area of ​​the second opening 32 is larger than the opening area of ​​the first opening 31. The hub 1 is configured to be conical or truncated cone, and the shape of the hub 1 can make the cross section of one end of the hub 1 smaller than that of the other end. Since the surface of the hub 1 on the smaller side has a smaller cross section, there is more space for arranging the blades 2, so that the partial area of ​​the blades 2 used for cutting the wind is larger, and the wind cutting performance is better. The first opening 31 and the second opening 32 provided on the fan cover 3 correspond to the air inlet and the air outlet of the fan blades respectively; the opening area of ​​the first opening 31 is smaller than the opening area of ​​the second opening 32, so that the speed of the airflow entering the fan blades is limited and relatively small, the airflow is easier to control, and it is not easy to generate airflow vortex, which plays a rectifying role on the airflow entering the fan blades, so that the airflow circulates more efficiently in the fan blades. The opening area of ​​the second opening 32 is greater than the opening area of ​​the first opening 31 , which can enable the airflow to flow out more quickly, facilitate the pressure release of the airflow and reduce the aerodynamic noise of the fan blade outlet.

[0047] See also Figure 3 , Figure 3 Schematic diagram of the cross-section of the fan blades of this embodiment.

[0048] like Figure 3 As shown, in some embodiments, the fan cover 3 includes: an air inlet ring 33 and a guide cover 34 , the air inlet ring 33 is connected to the guide cover 34 , the first opening 31 is opened on the air inlet ring 33 , and the second opening 32 is opened on the guide cover 34 .

[0049] The air inlet ring 33 and the air deflector 34 are manufactured by an integrated manufacturing technology, so the connection between the air inlet ring 33 and the air deflector 34 in this embodiment includes a connection relationship formed by the integrated manufacturing technology. However, the connection method between the air inlet ring 33 and the air deflector 34 is not limited to this. According to different specific application scenarios, in some embodiments, the connection method between the air inlet ring 33 and the air deflector 34 also includes (but is not limited to): adhesive connection, hot melt connection, welding, plug-in or clamping connection and other connection methods.

[0050] In some embodiments, the thickness of the air inlet ring 33 gradually increases in the opposite direction of the air inlet direction D2 of the fan blades. During the rotation of the fan blades, the airflow flowing through them is driven to rotate and discharge air. However, the rotation of the fan blades will also cause a small part of the airflow entering therein to scatter and generate turbulence. When the direction of the turbulent flow is in the opposite direction of the air inlet direction D2 of the fan blades, the fan airflow will generate a reverse airflow, which will interfere with the normal air intake of the fan blades and reduce the air intake efficiency of the fan blades. The thickness of the air inlet ring 33 gradually increases in the opposite direction of the air inlet direction D2 of the fan blades, which can intercept the reverse airflow and improve the air intake efficiency of the fan blades.

[0051] In some embodiments, the thickness of the air inlet ring 33 gradually increases to a maximum and then gradually decreases along the opposite direction of the air inlet direction D2 of the fan blades. This structure can also intercept the reverse airflow of the fan blades. At the same time, along the opposite direction of the air inlet direction D2 of the fan blades, the thickness of the air inlet ring 33 gradually increases to a maximum and then gradually decreases, which can increase the opening area of ​​the outermost opening of the air inlet ring 33, increase the air intake of the fan blades, and further improve the air intake efficiency of the fan blades.

[0052] In some embodiments, the outer surface of the air guide cover 34 is raised at a position adjacent to the second opening 32 to form an annular baffle 35. When the fan blades rotate, a negative pressure wind zone will be formed at the position of the second opening 32 of the fan cover 3. After the negative pressure wind zone is formed, the airflow around the fan cover 3 will also flow from the first opening 31 to the second opening 32 along the surface of the fan cover 3, forming an external airflow flow. The airflow formed by the external airflow will intersect with the airflow of the fan blades at the second opening 32. After the two airflows with different flow rates intersect here, an airflow vortex will be generated, thereby reducing the air outlet efficiency of the fan blades. The setting of the annular baffle 35 can block the external airflow from flowing in the direction of the second opening 32, reduce the kinetic energy of the external airflow, and reduce the probability of the airflow intersecting to form a vortex, thereby improving the air outlet efficiency of the fan blades.

[0053] Furthermore, when the fan blades in this embodiment are assembled into the fan, the airflow flowing out of the fan blades needs to flow a certain distance inside the fan housing before it can flow out of the fan outlet. In this process, the airflow flowing along the outlet direction may be blocked by the inner wall of the fan housing or affected by the size of the fan outlet. The return airflow will flow along the surface of the fan cover 3 from the second opening 32 to the first opening 31. At this time, the two airflows on the surface of the fan cover 3 that flow in opposite directions will intersect, generating an airflow vortex, thereby affecting the air inlet and outlet efficiency of the fan blades. The annular baffle 35 can also block the flow of the return airflow, reduce the energy of the intersection of the return airflow and the external airflow, reduce the probability and energy of the two forming an airflow vortex, and improve the air inlet and outlet efficiency of the fan blades. Therefore, it can be seen that the annular baffle 35 can block the intersection of airflows in two opposite directions.

[0054] See also Figure 4 and Figure 5 , Figure 4 Schematic diagram of the structure of the hub and blades of this embodiment; Figure 5 It is a schematic structural diagram of the hub, blades, directions and schematic angles of this embodiment.

[0055] like Figure 4 As shown, in some embodiments, each blade 2 of the plurality of blades 2 includes a blade tip 22, and the direction facing the blade tip 22 is the same as the rotation direction D1 of the fan blade.

[0056] The direction of the blade tip 22 is the same as the rotation direction D1 of the fan blade. The direction of the blade tip 22 can make the blade tip 22 and the contacting airflow form a "shovel" posture. In this posture, the blade tip 22 can more conveniently cut the airflow, and at the same time, it is convenient for the cut airflow to enter the inside of the fan blade along the guidance of the blade tip 22. Therefore, the direction of the blade tip 22 can increase the air intake of the fan blade and reduce the wind resistance and aerodynamic wind noise when the fan blade rotates.

[0057] In some embodiments, each blade 2 of the plurality of blades 2 includes a blade tip 22 , and an angle θ1 between an extension line L1 of a direction in which the blade tip 22 points and a horizontal direction H1 is an acute angle.

[0058] In this embodiment, the orientation of the blade tip 22 refers to the orientation of the blade tip 22 relative to the horizontal direction H1 , and the direction of the blade tip 22 refers to the direction in which the end of the blade tip 22 points.

[0059] The angle θ1 between the extension line L1 of the direction in which the blade tip 22 points and the horizontal direction H1 is an acute angle, which can enable the blade tip 22 to form a "shovel" posture with the contacting airflow. In this posture, the angle between the blade tip 22 and the cut airflow is an acute angle θ1, which can more conveniently and labor-savingly cut the airflow, reduce the airflow resistance of the fan blades, and improve the rotation efficiency of the fan blades.

[0060] In some embodiments, a wind-cutting slope 24 is provided at the position of the blade tip 22, and the wind-cutting slope 24 extends in the opposite direction of the rotation direction D1 of the fan blade. The end of the wind-cutting slope 24 is sharper, and when the fan blade rotates, the fan blade can better cut the airflow, reduce the resistance of the fan blade during the rotation process, and make the rotation efficiency of the fan blade higher. At the same time, since the wind-cutting slope 24 extends in the opposite direction of the rotation direction D1 of the fan blade, the blade 2 can have a better guiding effect on the airflow flowing through the surface of the fan blade, so that the airflow is separated from the blade 2 of the fan blade at a larger angle, reducing the noise generated by the side and the airflow.

[0061] The position of the blade tip 22 is not limited to setting the wind cutting slope 24. According to different specific application scenarios, in some embodiments, the position of the blade tip 22 can be a rounded blunt structure or a prismatic shape.

[0062] In some embodiments, the wind cutting slope 24 includes: a curved portion 241 and a linear portion 242 , one end of the linear portion 242 is connected to the surface of the hub 1 , the other end of the linear portion 242 is connected to the curved portion 241 , and the other end of the curved portion 241 is connected to the blade edge 21 .

[0063] In some embodiments, the angle θ2 between the blade tip 22 and the blade edge 21 is an acute angle. The structure of the blade tip 22 and the blade edge 21 can make the outermost end of the blade tip 22 protrude to form a sharp portion. The acute angle structure can make the contact area of ​​the blade tip 22 gradually increase as the fan blade rotates when cutting the airflow, so that the fan blade can cut the air more easily, reduce the wind resistance of the fan blade rotation, and improve the rotation efficiency of the fan blade.

[0064] The angle between the blade tip 22 and the blade edge 21 is not limited thereto. Depending on the specific application scenario, in some embodiments, the angle between the blade tip 22 and the blade edge 21 can be a right angle or an obtuse angle.

[0065] In some embodiments, each blade 2 of the plurality of blades 2 includes a blade tail 23 , which is bent and extends in a direction opposite to the rotation direction D1 of the fan blade.

[0066] According to the interaction of forces, when the fan blades rotate along their rotation direction D1, the airflow flowing through the fan blades has a tendency to move in the opposite direction of the rotation direction of the fan blades. When the airflow flows along the shape of the blade 2, the blade tail 23 bends and extends in the opposite direction of the rotation direction D1 of the fan blades. This curved structure fits the flow trend of the airflow inside the fan blades, making the blade 2 more smooth in restraining the airflow and improving the air outlet efficiency of the fan. At the same time, since the bending direction of the blade tail 23 is consistent with the flow trend of the airflow, the friction between the blade tail 23 and the airflow can be reduced when the airflow flows out of the business, thereby reducing the aerodynamic noise generated by the airflow at the blade tail 23.

[0067] In some embodiments, the wind-cutting slope 24 includes: a curved portion 241 and a linear portion 242, one end of the linear portion 242 is connected to the surface of the hub 1, the other end of the linear portion 242 is connected to the curved portion 241, and the other end of the curved portion 241 is connected to the blade edge 21. The outer portion of the wind-cutting slope 24 is configured as a curved portion 241, because the contact surface between the curved portion 241 and the airflow is gradually increased during the rotation of the blade 2 with the hub 1, and the curved portion 241 located on the outer side has a greater linear velocity. Therefore, the curved portion 241 can better cut the wind and increase the wind-cutting ability of the blade tip 22. At the same time, since the curved portion 241 is in contact with the airflow at different positions step by step, the resistance to the airflow is reduced, and the aerodynamic noise generated when the fan blade rotates is reduced. The linear portion 242 connected to the curved portion 241 is distributed on the inner side of the blade tip 22, and the linear velocity of the linear portion 242 when rotating is smaller than that of the curved portion 241, so the wind resistance is smaller. The straight structure of the linear portion 242 enables the linear portion 242 to synchronously contact the airflow, thereby increasing the wind cutting area of ​​the wind cutting slope 24 , so that the wind cutting slope 24 can increase the wind cutting efficiency through the curved portion 241 and increase the wind cutting volume through the linear portion 242 .

[0068] In some embodiments, the length of the blade tip 22 is greater than the length of the blade tail 23. The blade tip 22 is used to cut the wind during the rotation of the fan blade. By widening the length of the blade tip 22, the cutting area of ​​the blade tip 22 can be increased, and the air intake efficiency of the blade tip 22 can be improved. The blade tail 23 is used for air discharge. The width of the blade tail 23 is small, which can reduce the restraining ability of the blade tail 23 on the outflowing airflow, so that the friction between the outflowing airflow and the blade tail 23 is smaller, the air discharge efficiency of the blade tail 23 is improved, and the aerodynamic noise of the blade tail 23 is reduced. At the same time, since the area of ​​the air inlet side of the fan blade is smaller than the area of ​​the air outlet side, that is, the opening area of ​​the first opening 31 is smaller than the opening area of ​​the second opening 32, the air outlet area is larger than the air inlet area, and the length of the blade tip 22 is greater than the length of the blade tail 23, which can increase the air intake, balance the wind pressure on both sides, avoid airflow loss caused by the large difference in wind pressure on both sides of the fan blade, and improve the working efficiency of the fan blade.

[0069] The length between the blade tip 22 and the blade tail 23 is not limited thereto. Depending on the specific application scenario, in some embodiments, the length of the blade tip 22 can be the same as the length of the blade tail 23 or the length of the blade tip 22 can be less than the length of the blade tail 23.

[0070] In some embodiments, at least one arc-shaped notch 231 is provided at the blade tail 23. When the fan blades rotate, the internal airflow will rotate synchronously with the fan blades to generate a rotating airflow. Between adjacent blades 2, after the wind is discharged at the blade tail 23 of the front blade 2, the rotating airflow will move obliquely according to inertia, and the inclined airflow will collide with the airflow flowing out of the rear blade 2, and the airflows with fixed directions will generate a vortex after the intersection, affecting the air outlet efficiency of the fan blades. The arc-shaped notch 231 is provided at the blade tail 23, so that the airflow flowing out of the blade tail 23 of each blade 2 can be diverted into multiple airflows, and the energy of each airflow is reduced, so as to avoid the energy and route of the airflow flowing out of the blade tail 23 being too concentrated, and colliding with the airflow flowing out of the blade tail 23 of the rear blade 2 or forming a vortex, thereby improving the air outlet efficiency of the fan blades and reducing the aerodynamic wind noise of the fan blades.

[0071] In this embodiment, there are two arc-shaped notches 231 at the blade tail 23. However, the number of the arc-shaped notches 231 is not limited thereto, and according to different specific application scenarios, in some embodiments, the number of the arc-shaped notches 231 can be (not limited to): 2, 3, 4, 5 or more.

[0072] The arc-shaped notch 231 has a rounded and smooth surface, and has a small resistance to the airflow flowing out of it. Therefore, the arc-shaped notch 231 can improve the air outlet efficiency of the blade tail 23. At the same time, the two sides of the arc-shaped notch 231 are symmetrical to each other in the same linear dimension, which can avoid the vibration of the blade 2 caused by the inconsistent airflow velocity after the pressure relief on the left and right sides, improve the stability of the fan blade rotation, and reduce the aerodynamic noise of the fan blade.

[0073] The notch at the blade tail 23 is not limited thereto. Depending on the specific application scenario, in some embodiments, the notch of the blade tail 23 has a shape (not limited to): a wedge shape, a quadrilateral, other polygons, or a heart shape.

[0074] In some embodiments, the connection position of the curved portion 241 and the blade edge 21 is configured to form an acute angle. The sharp portion formed by connecting the curved portion 241 and the blade edge 21 to form an acute angle can make the structure of the sharp portion more protruding, and the wind cutting effect is better. At the same time, the curved portion 241 can also guide the airflow, so that the airflow moves along the curved portion 241 toward the hub 1, thereby improving the fan blade's ability to gather the incoming airflow and making the airflow more concentrated.

[0075] In some embodiments, when two or more arc-shaped notches 231 are provided at the blade tail 23, an arc-shaped protrusion 232 is provided between two adjacent arc-shaped notches 231, and the arc-shaped protrusion 232 is in the opposite direction to the arc-shaped notch 231. When two or more arc-shaped notches 231 are provided at the blade tail 23, an arc-shaped protrusion 232 is provided between two adjacent arc-shaped notches 231. The provision of the arc-shaped protrusion 232 can further divert the airflow flowing out of the blade tail 23. Further, the air outlet efficiency of the fan blade is improved, and the aerodynamic wind noise of the fan blade is reduced.

[0076] In some embodiments, when two or more arc-shaped notches 231 are provided at the blade tail 23, the area of ​​the arc-shaped notches 231 gradually decreases along the direction from the hub 1 to the fan cover 3. Since, when the fan blade rotates, the wind force of the airflow in the fan blade gradually decreases along the direction from the hub 1 to the fan cover 3, the area of ​​the arc-shaped notches 231 gradually decreases along the direction from the hub 1 to the fan cover 3, so that the larger arc-shaped notches 231 release and relieve pressure on the strong airflow, and the smaller arc-shaped notches 231 release and relieve pressure on the weak airflow, thereby making the different positions of the blade tail 23 release pressure and release airflow equivalently according to the strength of the airflow at the corresponding position, so as to achieve the purpose of balanced airflow at the blade tail 23. Balanced airflow can also avoid local vibration caused by unbalanced discharge at different positions of the blade tail 23, and therefore, can also reduce the aerodynamic noise of the fan blade.

[0077] It should be noted that any implementation in this embodiment can be implemented independently or in combination with one or more other implementations. When implemented in combination, the combination method should not be limited to the combination methods listed in this embodiment.

[0078] Example 2

[0079] A blowing device includes the fan blades in embodiment 1, wherein the fan blades serve as core module components for assembling the blowing device. The fan blades are used to promote airflow in the blowing device.

[0080] It should be noted that the blowing device in this embodiment includes (but is not limited to): bladeless fans, desktop fans, floor fans, spherical fans, neck fans, handheld fans, industrial fans, air conditioners, hair dryers and other products that need to promote air circulation. The fan blades in Example 1 are assembled on the above products as air outlet components.

[0081] The blowing device in this embodiment is provided with a fan cover 3, and the fan cover 3 is covered on the fan blades 2, and the blade edge 21 of the fan blades 2 is connected to the fan cover 3. The setting of the fan cover 3 forms a side-closed air duct structure between the hub 1 and the fan cover 3, and this structure enables the side wall of the fan cover 3 to block and offset the centrifugal force received by the airflow when the fan blades push the airflow to rotate, thereby avoiding the airflow flowing through the fan blades from overflowing under the action of centrifugal force, thereby improving the air outlet efficiency and air volume of the fan blades. At the same time, since the overflow channel of the fan blades is limited by the fan cover 3, the rotating overflow airflow cannot form an airflow vortex that affects the rotation of the fan blades, thereby avoiding the aerodynamic noise formed by the airflow vortex, and can greatly reduce the aerodynamic noise of the fan blades. Furthermore, due to the covering design of the fan cover 3, the blade edge 21 of the fan blade does not need to rub and collide with the airflow in the fan blade, thereby reducing the rotation resistance of the fan blade, making the rotation efficiency of the fan blade higher, and avoiding the aerodynamic noise generated by the friction between the blade edge 21 and the airflow, thereby further reducing the aerodynamic noise of the fan blade.

[0082] It should be noted that the preferred embodiments of the present application are given in the specification and drawings of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described in the specification. These embodiments are not intended to be additional limitations on the content of the present application. The purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. In addition, the above-mentioned technical features continue to be combined with each other to form various embodiments not listed above, which are all considered to be within the scope of the present invention; further, for ordinary technicians in this field, they can be improved or transformed according to the above description, and all these improvements and transformations should belong to the scope of protection of the claims attached to the present application.

Claims

1. A fan blade, characterized in that: include: a wheel hub, the wheel hub being connected to the fan motor; A plurality of blades, the plurality of blades are disposed on an outer surface of the hub in a surrounding manner; A fan cover is provided on the plurality of blades, and blade edges of the plurality of blades are connected to the fan cover.

2. The fan blade according to claim 1, characterized in that: Each of the plurality of blades is bent and extended along the hub surface from the top end of the hub to the edge of the side, and each of the blades is in a twisted shape; and / or, The hub is configured to be conical or truncated cone-shaped; and / or, The fan cover is respectively provided with a first opening and a second opening along the air inlet direction of the fan blades, and an opening area of ​​the second opening is larger than an opening area of ​​the first opening.

3. The fan blade according to claim 2, characterized in that: The fan cover comprises: an air inlet ring and an air guide cover, the air inlet ring is connected to the air guide cover, the first opening is arranged on the air inlet ring, and the second opening is arranged on the air guide cover.

4. The fan blade according to claim 3, characterized in that: The thickness of the air inlet ring gradually increases in the opposite direction of the air inlet direction of the fan blades; or, The thickness of the air inlet ring gradually increases along the opposite direction of the air inlet direction of the fan blades to a maximum and then gradually decreases.

5. The fan blade according to claim 3, characterized in that: The outer surface of the air deflector is raised at a position adjacent to the second opening to form an annular retaining edge.

6. The fan blade according to claim 1, characterized in that: Each of the plurality of blades comprises: a blade tip, the direction in which the blade tip faces is the same as the rotation direction of the fan blade; and / or, Each of the plurality of blades comprises a blade tip, and an angle between an extension line of a direction in which the blade tip points and a horizontal direction is an acute angle.

7. The fan blade according to claim 6, characterized in that: A wind-cutting inclined plane is provided at the position of the blade tip, and the wind-cutting inclined plane extends in the opposite direction of the rotation direction of the fan blade; and / or, The angle between the blade tip and the blade edge is an acute angle; and / or, Each of the plurality of blades includes a blade tail, and the blade tail is bent and extends in a direction opposite to a rotation direction of the fan blade.

8. The fan blade according to claim 7, characterized in that: The wind-cutting slope comprises: a curved portion and a linear portion, one end of the linear portion is connected to the hub surface, the other end of the linear portion is connected to the curved portion, and the other end of the curved portion is connected to the blade edge; and / or, The length of the blade tip is greater than the length of the blade tail; and / or, At least one arc-shaped notch is arranged at the blade tail.

9. The fan blade according to claim 8, characterized in that: The connection position between the curved portion and the blade edge is configured to form an acute angle; and / or, When two or more arc-shaped notches are provided at the blade tail, an arc-shaped protrusion is provided between two adjacent arc-shaped notches, and the arc-shaped protrusion is in the opposite direction to the arc-shaped notch; and / or, When two or more arc-shaped notches are provided at the blade tail, the area of ​​the arc-shaped notches gradually decreases along the direction from the hub to the fan cover.

10. A blowing device, characterized in that: The blowing device is assembled with the fan blades as described in any one of claims 1-9.

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