Fan blade

Abstract

Provided is a fan blade, which includes a hub, a bottom plate, and a plurality of blades. The hub is connected to the bottom plate, and the plurality of blades are spaced around a circumference outer side of the hub. The blade extends parallel to an axial direction of the hub, and a lower end of the blade is connected to the bottom plate. The blade includes a main body and an extension part. The extension part is provided on one side of the main body away from the hub, extends in a direction away from the hub and extends towards a lower surface of the bottom plate.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is a continuation in part of US 19 / 034713, filed on January 23, 2025. Which claims priority to Chinese patent application number 202323349361.0, filed on December 7, 2023. Both of which are hereby incorporated by reference in their entireties.TECHNICAL FIELD

[0002] The present disclosure relates to the field of fan technologies, and in particular, to a fan blade.BACKGROUND

[0003] A fan generally refers to a device used for heat dissipation, such as a hanging neck fan, handheld fan, etc. A fan usually includes an impeller and a motor. The impeller is composed of a hub, a bottom plate, and a plurality of blades. The hub is located on the bottom plate, and the blades are connected to the bottom plate and hub. The hub is driven to rotate by the motor, and the hub is caused to drive the blades to rotate. When the blades rotate, they suck air into the air guide groove and blow it outward to produce an airflow, which takes away heat and achieves the purpose of heat dissipation.

[0004] However, in traditional impellers, because the blades are all connected to the bottom plate and hub, only one side of the air inlet enters the air guide groove, resulting in low air intake and exhaust efficiency when the impeller rotates.SUMMARY

[0005] The present disclosure addresses the shortcomings of existing technology and provides a fan blade that adopts a multi side inlet and multi side outlet setting, allowing the air to enter from multiple directions and exit from multiple directions during the blade rotation. The inlet and outlet air volumes are larger, which can improve the efficiency of inlet and outlet air.

[0006] To achieve the above objectives, the present disclosure adopts the following technical solution.

[0007] A fan blade includes a hub, a bottom plate, and a plurality of blades; where the hub is connected to the bottom plate, and the plurality of blades are spaced around a circumference outer side of the hub; the blade extends parallel to an axial direction of the hub, and a lower end of the blades is connected to the bottom plate. The blade includes a main body and an extension part, and the extension part is provided on one side of the main body away from the hub; the extension part extends in a direction away from the hub and extends towards a lower surface of the bottom plate; a lower end surface of the extension parts is not lower than the lower surface of the bottom plate; the extension part protrudes from a circumference outer wall of the bottom plate and connect to the circumference outer wall of the bottom plate.

[0008] There is a distance between the main bodies and the hub to form a circular groove; a first air guide groove is provided between two adjacent main bodies and an upper surface of the bottom plate; a third air guide groove is provided between two adjacent extension parts and a circumference side wall of the bottom plate; a first air outlet is provided on one side of two adjacent extension parts away from the hub, and both the first air guide groove and the third air guide groove are communicated to the first air outlet, the third air guide groove opens downward to form a third air outlet.

[0009] The first air guide groove is opened on one side away from the bottom plate to form a first air inlet, and the first air guide groove is opened on one side facing the circular groove to form a second air inlet.

[0010] In an embodiment, the bottom plate includes a flat plate and an inclined plate, an upper end of the inclined plate is connected to the hub, and a lower end of the inclined plate is connected to the flat plate; a circumference outer wall surface of the inclined plate forms a first guide wind slope, and the first guide wind slope extends from top to bottom in a direction away from the hub to an upper surface of the flat plate, and the lower end surface of the extension part is flush with a lower surface of the flat plate.

[0011] In an embodiment, a second guide wind slope is provided on one side of a top of the main body adjacent to the hub, and the second guide wind slope extends from the top of the main body to the first guide wind slope on the bottom plate.

[0012] In an embodiment, an angle between the first guide wind slope and the upper surface of the flat plate is 125-150 degrees.

[0013] In an embodiment, the angle is between 135-145 degrees.

[0014] In an embodiment, the flat plate is an annular flat plate.

[0015] In an embodiment, a distance between two adjacent blades gradually increases in a direction of air flow from the first air guide groove to the first air outlet.

[0016] In an embodiment, a magnetic frame accommodation groove is provided on the hub, and the magnetic frame accommodation groove is opened along the axial direction of the hub to form an installation opening.

[0017] In an embodiment, an arc-shaped groove is provided on the circumference outer wall of the bottom plate, and the arc-shaped groove penetrates through upper and lower surfaces of the bottom plate; the arc-shaped groove is communicated with the third air guide groove, and an inner wall of the arc-shaped groove forms an arc-shaped surface; opposite two sides of the arc-shaped surface extend to side walls of two adjacent extension parts.

[0018] In an embodiment, the arc-shaped surface includes a first arc-shaped surface and a second arc-shaped surface that are arranged at intervals, where one side of the first arc-shaped surface away from the second arc-shaped surface extends to a side wall of an adjacent extension part, and one side of the second arc-shaped surface away from the first arc-shaped surface extends to a side wall of another adjacent extension part.

[0019] Compared with existing technologies, the present disclosure has significant advantages and beneficial effects. Specifically, by setting the main bodies of the blades to maintain a distance from the hub to form the circular groove, the first air guide groove is provided between two adjacent main bodies and the upper surface of the bottom plate, and the extension part is provided on the side of the main body away from the hub, the extension part is extended in the direction away from the hub and extended towards the lower surface of the bottom plate. The lower end surface of the extension part is not lower than the lower surface of the bottom plate. The extension parts are connected to the circumference outer wall of the bottom plate, and the third air guide groove is provided between two adjacent extension parts and the circumference side wall of the bottom plate. The first air outlet is provided on the side of the two adjacent extension parts away from the hub, and the first air guide groove and the third air guide groove are communicated to the first air outlet, and the third air guide groove opens downwards to form the third air outlet, the first air guide groove opens upwards to form the first air inlet, and the side of the first air guide groove facing the circular groove opens upwards to form the second air inlet. When the blade rotates, air flows into the first air guide groove from the first and second air inlets. Part of air in the first air guide groove is directly discharged from the first air outlet, and other parts of air enter the third air guide groove and are discharged from the first and third air outlets. The first air outlet serves as a main air outlet, and the third air outlet serves as an auxiliary air outlet. Therefore, multiple side air inlet and multiple side air outlet are adopted, so that when the blade rotates, air enters from multiple directions and exits from multiple directions. The air inlet and outlet volumes are larger, which can improve the efficiency of air inlet and outlet.

[0020] To provide a clearer explanation of the structural features, technical means, and specific objectives and functions achieved by the present disclosure, further detailed explanations will be provided below in combination with the accompanying drawings and specific embodiments.BRIEF DESCRIPTION OF DRAWINGS

[0021] FIG. 1 is a schematic structural diagram of a first embodiment of the present disclosure.

[0022] FIG. 2 is a top view of the first embodiment of the present disclosure.

[0023] FIG. 3 is a cross-sectional view of the first embodiment of the present disclosure.

[0024] FIG. 4 is a schematic structural diagram of a second embodiment of the present disclosure.

[0025] FIG. 5 is a top view of the second embodiment of the present disclosure.

[0026] FIG. 6 is a sectional view of the second embodiment of the present disclosure.

[0027] FIG. 7 is a schematic structural diagram of a third embodiment of the present disclosure.

[0028] FIG. 8 is a schematic structural diagram of a fourth embodiment of the present disclosure.

[0029] FIG. 9 is a cross-sectional view of the fourth embodiment of the present disclosure.

[0030] FIG. 10 is a schematic structural diagram of a fifth embodiment of the present disclosure.

[0031] FIG. 11 is a schematic structural diagram of a sixth embodiment of the present disclosure.

[0032] FIG. 12 is a top view of the sixth embodiment of the present disclosure.

[0033] FIG. 13 is a sectional view of the sixth embodiment of the present disclosure.

[0034] FIG. 14 is a schematic diagram of the sixth embodiment of the present disclosure from another perspective.

[0035] FIG. 15 is a schematic structural diagram of a seventh embodiment of the present disclosure.

[0036] FIG. 16 is a cross-sectional view of the seventh embodiment of the present disclosure.

[0037] FIG. 17 is a top view of the seventh embodiment of the present disclosure.

[0038] FIG. 18 is a cross-sectional view of the seventh embodiment of the present disclosure from another perspective.

[0039] FIG. 19 is a schematic structural diagram of an eighth embodiment of the present disclosure.

[0040] Numeral reference: 10- hub; 11- circular groove; 12- magnetic frame accommodation groove; 121- installation opening; 20- bottom plate; 21- flat plate; 22- inclined plate; 221- first guide wind slope; 30- first blade; 301- main body; 302- extension part; 31- first air guide groove; 32- first air inlet; 33- second air inlet; 34- first air outlet; 35- second guide wind slope; 37- third air guide groove; 371- third air outlet; 38- arc-shaped groove; 381- arc-shaped surface; 382- first arc-shaped surface; 383- second arc-shaped surface; 40- second blade; 41- second air guide groove; 42- third air inlet; 43- second air outlet; 50- connection ring.DESCRIPTION OF EMBODIMENTS

[0041] In the description of the present disclosure, it should be noted that terms “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside”, “outside” and other directional or positional relationships indicated are based on the directional or positional relationships shown in the accompanying drawings, only for the convenience of describing and simplifying the description, and do not indicate or imply that the referred position or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure.

[0042] In the present disclosure, it should be noted that unless otherwise specified and limited, terms “installation”, “connection to”, and “connection with” should be broadly understood, 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 directly connected, indirectly connected through an intermediate medium, or connected internally between two components. For those skilled in the art, the specific meanings of the above terms in the present disclosure can be understood depending on the specific situation.

[0043] As shown in FIGS. 1-3, the present disclosure relates to a fan blade. In a first embodiment, the fan blade includes a hub 10, a bottom plate 20, and a plurality of first blades 30. The hub 10 is connected to the bottom plate 20, and the bottom plate 20 is a flat plate shaped bottom plate 20. Lower ends of the first blades 30 are connected to an upper surface of the bottom plate 20, and the first blades 30 extend parallel to an axial direction of the hub 10. The plurality of first blades 30 are spaced around a circumference outer side of the hub 10, and there is a distance between the first blades 30 and the hub 10. The distance b between the first blades 30 and the hub 10 is 0.3 mm to 5.0 mm, in an implementation mode, it is 1.0 mm-4.0 mm. A circular groove 11 is formed between an outer circumferential wall of the hub 10, the upper surface of the bottom plate 20, and one end of the first blades 30 close to the hub 10. A first air guide groove 31 is provided between two adjacent first blades 30. One side of the first air guide groove 31 away from the bottom plate 20 is opened to form a first air inlet 32. One side of first air guide groove 31 close to the hub 10 is opened to form a second air inlet 33, and the second air inlet 33 is communicated to the circular groove 11. One side of the first air guide groove 31 away from the hub 10 is opened to form a first air outlet 34.

[0044] The hub 10 is provided with a magnetic frame accommodation groove 12, and a lower end of the hub 10 is provided with an installation opening 121 that is communicated to the magnetic frame accommodation groove 12. One end of the hub 10 close to the installation opening 121 is connected to the bottom plate 20, and the first blades 30 are extended from the upper surface of the bottom plate 20, parallel to an axis of the hub 10, and towards a direction away from the installation opening 121.

[0045] As shown in FIGS. 4-6, in a second embodiment, the fan blade further includes a plurality of second blades 40, and the plurality of second blades 40 are spaced in an annular interval on an upper end surface of the hub 10. A second air guide groove 41 is provided between two adjacent second blades 40, one side of the second air guide groove 41 away from the upper end surface of the hub 10 is opened to form a third air inlet 42. One side of the second air guide groove 41 close to the first blade 30 is opened to form a second air outlet 43. By setting the plurality of second blades 40 distributed in an annular interval on the upper end surface of the hub 10, the second air guide groove 41 is formed between two adjacent second blades 40. The third air inlet 42 and the second air outlet 43 are set on the second air guide groove 41, so that when the fan blades are rotated, the first blades 30 and the second blades 40 simultaneously gather air, resulting in a larger air intake volume and higher air intake efficiency of the fan blade.

[0046] The number of the first blades 30 is greater than or equal to the number of the second blades 40.

[0047] One end of the second blades 40 close to the first blades 30 does not protrude from the circumferential outer wall of the hub 10.

[0048] One end of the second blades 40 away from the first blades 30 is kept at a distance from a central axis of the hub 10.

[0049] An upper end surface of the first blades 30 protrudes from the upper end surface of the hub 10.

[0050] The first blades 30 and the second blades 40 are both arc-shaped blades, and bending directions of the first blades 30 and the second blades 40 are the same. In an implementation mode, the first blades 30 and the second blades 40 are both bent in a clockwise direction, or the first blades 30 and the second blades 40 are both bent in a counterclockwise direction.

[0051] A center of the annular structure surrounded by the first blades 30 is on the same axis as a center of the annular structure surrounded by the second blades 40.

[0052] A width of the second air guide groove 41 gradually increases from an inner side to an outer side.

[0053] The first blades 30 include a main body 301 and an extension part 302. The extension part 302 is provided on one side of the main body 301 away from the hub 10, extends in a direction away from the hub 10. The extension part 302 extends towards a lower surface of the bottom plate 20, and has a lower end surface which is not lower than the lower surface of the bottom plate 20. The extension part 302 protrudes from a circumference outer wall of the bottom plate 20 and connects to the circumference outer wall of the bottom plate 20. The main body 301 and the extension part 302 are bounded by an edge of the bottom plate 20. An orthographic projection of the main body 301 on a plane where the base plate 20 is located is within the edge of the base plate 20, and the extension part 302 is provided outside the edge of the bottom plate 20. For example, the lower end surface of the extension part 302 is flushed with the lower surface of the bottom plate 20.

[0054] The first air guide groove 31 is provided between two adjacent main bodies 301 and the upper surface of the bottom plate 20, the third air guide groove 37 is provided between two adjacent extension parts 302 and a circumference side wall of the bottom plate 20, and the third air guide groove 37 opens downward to form a third air outlet 371. The first air outlet 34 is provided on one side of two adjacent extension parts 302 away from the hub 10, and both the first air guide groove 31 and the third air guide groove 37 are communicated to the first air outlet 34.

[0055] The bottom plate 20 includes a flat plate 21 and an inclined plate 22 that are connected in one piece. An upper end of the inclined plate 22 is connected to the hub 10, and a lower end of the inclined plate 22 is connected to the flat plate 21. In an implementation mode, the inclined plate 22 extends from top to bottom in a direction away from the hub 10.

[0056] It should be noted that the bottom plate 20 described in the present disclosure can also be set as a single inclined plate or a curved plate. In an implementation mode, the inclined plate is extended from top to bottom in a direction away from the hub 10, and the curved plate is a structure that protrudes upward or is depressed downward. The lower end surfaces of the extension parts 302 are flushed with a lower surface of the flat plate 21.

[0057] A circumference outer wall of the inclined plate 22 forms a first guide wind slope 221, and the first guide wind slope 221 extends from top to bottom in a direction away from the hub 10 to the upper surface of the flat plate 21, and the extension part 302 is extended to the lower surface of the flat plate 21. By providing the first guide wind slope 221 and utilizing a guiding effect of the first guide wind slope 221, the air flows more smoothly from the circular groove 11 into the first air guide groove 31, resulting in a better air intake effect.

[0058] An angle β between the first guide wind slope 221 and the upper surface of the flat plate 21 is 125 degrees to 150 degrees. In an implementation mode, the angle β is 135 degrees to 145 degrees. By arranging the angle β between the first guide wind slope 221 and the upper surface of the flat plate 21 to 125-150 degrees, the air flow is smoother, and the air intake effect is better.

[0059] In an implementation mode, the angle β is 142 degrees.

[0060] One side of a top of the main body 301 of the first blade 30 is provided with a second guide wind slope 35 arranged by a missing angle on one side close to the hub 10, and the second guide wind slope 35 extends from top to bottom in a direction close to the hub 10.

[0061] As shown in FIG. 7, in a third embodiment, the fan blade further includes a connection ring 50, and the connection ring 50 is connected to one side of the top of the extension part 302 of the first blades 30 away from the hub 10. In an implementation mode, the connection ring 50 is a circular ring, and a central axis of the circular ring is coaxially arranged with a central axis of the hub 10.

[0062] As shown in FIGS. 8-9, in a fourth embodiment, the second guide wind slope 35 is extended from the top of the main body 301 of the first blade 30 to the first guide wind slope 221 on the bottom plate 20.

[0063] As shown in FIG. 10, in a fifth embodiment, the fan blade further includes a connection ring 50, and the connection ring 50 is connected to one side of the top of the extension part 302 of the first blade 30 away from the hub 10.

[0064] As shown in FIGS. 11-14, in a sixth embodiment, the upper end surface of the hub 10' is not provided with the second blades 40, and the second guide wind slope 35' is extended from the top of the main body 301' of the first blade 30' to the bottom plate 20'.

[0065] The main body 301' of the first blade 30' includes a first section 3011' and a second section 3012'. The first section 3011' is arranged to be close to the hub 10' and can be a straight section or a curved section. The second section 3012' is arranged to be away from the hub 10', where a curvature of the second section 3012' is greater than a curvature of the first section 3011'. A curvature of the extension part 302' is at least greater than the curvature of the first segment 3011'. The curvature of the extension part 302' may be equal to or less than the curvature of the second segment 3012'.

[0066] A length of the extension part 302' is half of a length of the main body 301'. In this way, an area of the third air outlet 371' can be increased, thereby improving the air outlet volume and efficiency.

[0067] The circumference outer wall of the bottom plate 20' is provided with an arc-shaped groove 38, and the arc-shaped groove 38 penetrates through upper and lower surfaces of the bottom plate 20'. The arc-shaped groove 38 is communicated to the third air guide groove 37', and an inner wall of the arc-shaped groove 38 is provided with an arc-shaped surface 381. Opposite two sides of the arc-shaped surface 381 extend to side walls of two adjacent extension parts 302'. In an implementation mode, the arc-shaped groove 38 penetrates through the upper and lower surfaces of the flat plate 21'. By setting the arc-shaped groove 38, and the arc-shaped groove 38 is communicated with the third air guide groove 37', the arc-shaped surface 381 is provided on the inner wall of the arc-shaped groove 38. The opposite two sides of the arc-shaped surface 381 extend to the side walls of the two adjacent extension parts 302'. When the blade rotates, the arc-shaped surface 381 makes the air flow in the arc-shaped groove 38 smooth and has better air outlet. Part of air flows go out from the third air outlet 371' through the arc-shaped groove 38, and the other part of air flows out from the first air outlet34', resulting in better volume and efficiency.

[0068] The arc-shaped surface 381 has a first arc-shaped surface 382 and a second arc-shaped surface 383 that are arranged at intervals. One side of the first arc-shaped surface 382 away from the second arc-shaped surface 383 is extended to a side wall of an adjacent extension part 302', and one side of the second arc-shaped surface 383 away from the first arc-shaped surface 382 is extended a side wall of another adjacent extension part 302'.

[0069] It can be understood that the first arc-shaped surface 382 and the second arc-shaped surface 383 can also be connected to form a single arc-shaped surface 381.

[0070] As shown in FIGS. 15-18, in a seventh embodiment, the end surface of the hub 10'' is not provided with the second blades 40, and one end of the hub 10'' away from the installation opening 121 is connected to the bottom plate 20''. The main body 301'' of the first blade 30'' extends from the upper surface of the bottom plate 20 parallel to the axial direction of the hub 10'' and towards an open direction close to the installation opening 121, and the second guide wind slope 35'' extends from a top end of the main body 301'' of the first blades 30'' to the bottom plate 20''.

[0071] The main body 301'' of the first blade 30'' includes a first section 3011'' and a second section 3012''. The first section 3011'' is arranged to be close to the hub 10'', and the second section 3012'' is arranged to be away from the hub 10''. A curvature of the second section 3012'' is greater than a curvature of the first section 3011''. A curvature of the extension part 302'' is at least greater than a curvature of the first section 3011''. The curvature of the extension part 302'' may be equal to or less than the curvature of the second section 3012''.

[0072] In a direction of air flow from the first air guide groove 31'' to the first air outlet 34'', a distance c between two adjacent first blades 30'' gradually increases, the flow rate per unit time in the first air guide groove 31'' and the third air guide groove 37'' is caused to gradually increase, thereby increasing the air output of the first air outlet 34'' and the third air outlet 371''.

[0073] As shown in FIG. 19, in an eighth embodiment, the fan blade further includes a connection ring 50, and the connection ring 50 is connected to the side of the lower end of the extension parts 302 of the first blades 30 away from the hub 10.

[0074] The above description is only preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Therefore, any modifications, equivalent substitutions, improvements, etc. made to the above embodiments based on the actual technology of the present disclosure still fall within the scope of the disclosed technical solution.

Claims

1. A fan blade, comprising: a hub, a bottom plate, and a plurality of blades;wherein the hub is connected to the bottom plate, and the plurality of blades are spaced around a circumference outer side of the hub; the blade extends parallel to an axial direction of the hub, and a lower end of the blade is connected to the bottom plate;wherein the blade comprises a main body and an extension part, and the extension part is provided on one side of the main body away from the hub; the extension part extends in a direction away from the hub and extends towards a lower surface of the bottom plate; a lower end surface of the extension part is not lower than the lower surface of the bottom plate; the extension part protrudes from a circumference outer wall of the bottom plate and connects to the circumference outer wall of the bottom plate;wherein a circular groove is formed between the main bodies and the hub;a first air guide groove is provided between two adjacent main bodies and an upper surface of the bottom plate;a third air guide groove is provided between two adjacent extension parts and a circumference side wall of the bottom plate;a first air outlet is provided on one side of two adjacent extension parts away from the hub, and both the first air guide groove and the third air guide groove are communicated to the first air outlet,the third air guide groove opens downward to form a third air outlet;wherein the first air guide groove is opened on one side away from the bottom plate to form a first air inlet, and the first air guide groove is opened on one side facing the circular groove to form a second air inlet.

2. The fan blade according to claim 1, wherein the bottom plate comprises a flat plate and an inclined plate, an upper end of the inclined plate is connected to the hub, and a lower end of the inclined plate is connected to the flat plate;a circumference outer wall surface of the inclined plate forms a first guide wind slope, and the first guide wind slope extends from top to bottom in a direction away from the hub to an upper surface of the flat plate, and the lower end surface of the extension part is flush with a lower surface of the flat plate.

3. The fan blade according to claim 2, wherein a second guide wind slope is provided on one side of a top of the main body adjacent to the hub, and the second guide wind slope extends from the top of the main body to the first guide wind slope on the bottom plate.

4. The fan blade according to claim 2, wherein an angle between the first guide wind slope and the upper surface of the flat plate is 125-150 degrees.

5. The fan blade according to claim 4, wherein the angle is between 135-145 degrees.

6. The fan blade according to claim 2, wherein the flat plate is an annular flat plate.

7. The fan blade according to claim 1, wherein a distance between two adjacent blades gradually increases in a direction of air flow from the first air guide groove to the first air outlet.

8. The fan blade according to claim 1, wherein a magnetic frame accommodation groove is provided on the hub, and the magnetic frame accommodation groove is opened along the axial direction of the hub to form an installation opening.

9. The fan blade according to claim 1, wherein an arc-shaped groove is provided on the circumference outer wall of the bottom plate, and the arc-shaped groove penetrates through upper and lower surfaces of the bottom plate;the arc-shaped groove is communicated with the third air guide groove, and an inner wall of the arc-shaped groove forms an arc-shaped surface;opposite two sides of the arc-shaped surface extend to side walls of two adjacent extension parts.

10. The fan blade according to claim 9, wherein the arc-shaped surface comprises a first arc-shaped surface and a second arc-shaped surface that are arranged at intervals,wherein one side of the first arc-shaped surface away from the second arc-shaped surface extends to a side wall of an adjacent extension part, and one side of the second arc-shaped surface away from the first arc-shaped surface extends to a side wall of an adjacent extension part.

11. The fan blade according to claim 1, wherein a length of the extension part is half of a length of the main body.

12. The fan blade according to claim 1, wherein the main body comprises a first section and a second section, the first section is arranged to be close to the hub, and the second section is arranged to be away from the hub, a curvature of the second section is greater than a curvature of the first section, a curvature of the extension part is at least greater than the curvature of the first section.

13. The fan blade according to claim 12, wherein the curvature of the extension part is equal to or less than the curvature of the second section.

14. A fan blade, comprising: a hub, a bottom plate, and a plurality of blades;wherein the hub defines an installation opening at one end of the hub, and an opposite end of the hub away from the installation opening is connected to the bottom plate, and the plurality of blades are spaced around a circumference outer side of the hub; the blade extends parallel to an axial direction of the hub;wherein the blade comprises a main body and an extension part, a lower end of the main body is connected to the bottom plate, and the extension part is provided on one side of the main body away from the hub; the extension part extends in a direction away from the hub and extends towards a lower surface of the bottom plate; a lower end surface of the extension part is flush with the lower surface of the bottom plate; the extension part protrudes from a circumference outer wall of the bottom plate and connects to the circumference outer wall of the bottom plate;wherein a circular groove is formed between the main bodies and the hub;a first air guide groove is provided between two adjacent main bodies and an upper surface of the bottom plate;a third air guide groove is provided between two adjacent extension parts and a circumference side wall of the bottom plate;a first air outlet is provided on one side of two adjacent extension parts away from the hub, and both the first air guide groove and the third air guide groove are communicated to the first air outlet,the third air guide groove opens downward to form a third air outlet;wherein the first air guide groove is opened on one side away from the bottom plate to form a first air inlet, and the first air guide groove is opened on one side facing the circular groove to form a second air inlet.

15. The fan blade according to claim 14, wherein a distance c between two adjacent blades gradually increases in a direction of air flow from the first air guide groove to the first air outlet.

16. The fan blade according to claim 14, wherein the main body comprises a first section and a second section, the first section is arranged to be close to the hub, and the second section is arranged to be away from the hub, a curvature of the second section is greater than a curvature of the first section, a curvature of the extension part is at least greater than the curvature of the first section.

17. The fan blade according to claim 14, wherein the bottom plate comprises a flat plate and an inclined plate, an upper end of the inclined plate is connected to the hub, and a lower end of the inclined plate is connected to the flat plate;a circumference outer wall surface of the inclined plate forms a first guide wind slope, and the first guide wind slope extends from top to bottom in a direction away from the hub to an upper surface of the flat plate, and the lower end surface of the extension part is flush with a lower surface of the flat plate.

18. The fan blade according to claim 17, wherein the flat plate is an annular flat plate.

19. The fan blade according to claim 17, wherein a second guide wind slope is provided on one side of a top of the main body adjacent to the hub, and the second guide wind slope extends from the top of the main body to the first guide wind slope on the bottom plate.

20. A fan blade, comprising: a hub, a bottom plate, and a plurality of blades;wherein the hub defines an installation opening at one end of the hub, and the end of the hub with the installation opening is connected to the bottom plate, and the plurality of blades are spaced around a circumference outer side of the hub; the blade extends parallel to an axial direction of the hub;wherein the blade comprises a main body and an extension part, a lower end of the main body is connected to the bottom plate, and the extension part is provided on one side of the main body away from the hub; the extension part extends in a direction away from the hub and extends towards a lower surface of the bottom plate; a lower end surface of the extension part is flush with the lower surface of the bottom plate; the extension part protrudes from a circumference outer wall of the bottom plate and connects to the circumference outer wall of the bottom plate;wherein a circular groove is formed between the main bodies and the hub;a first air guide groove is provided between two adjacent main bodies and an upper surface of the bottom plate;a third air guide groove is provided between two adjacent extension parts and a circumference side wall of the bottom plate;a first air outlet is provided on one side of two adjacent extension parts away from the hub, and both the first air guide groove and the third air guide groove are communicated to the first air outlet,the third air guide groove opens downward to form a third air outlet;wherein the first air guide groove is opened on one side away from the bottom plate to form a first air inlet, and the first air guide groove is opened on one side facing the circular groove to form a second air inlet.

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