fan

Abstract

The application provides a fan, which comprises a hub and a plurality of fan blades. The plurality of fan blades are arranged at a non-equidistant interval on the circumferential side of the hub. Each fan blade comprises a first surface and a second surface. The first surface comprises a first edge, a second edge, a third edge and a fourth edge. The first surface has a convex point and the second surface has a concave point. Each fan blade comprises a cutting surface with a division line. The intersection points of the division line with the first edge and the second edge are respectively a first intersection point and a second intersection point. The first intersection point, the second intersection point, the convex point and the concave point form respectively a first projection point, a second projection point, a third projection point and a fourth projection point on a first projection plane. A line connecting the first projection point and the third projection point forms a first line. A line connecting the second projection point and the fourth projection point forms a second line. The included angle between the first line and the second line is defined as a first included angle. The first included angles of adjacent fan blades are different. The application can maintain the working efficiency of the fan and reduce the noise generated during the operation of the fan.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic equipment heat dissipation device, and particularly relates to a fan. BACKGROUND

[0002] At present, general electronic equipment needs to be equipped with a heat dissipation device, such as a fan. During the operation of the fan, since the fan blades are equidistantly distributed, the amplitude of each fan blade striking air is superimposed, and high noise is generated. However, the non-equidistant distribution of the fan blades can make the amplitude of each fan blade different, thereby reducing the noise generated during the operation of the fan. However, the non-equidistant distribution of the above fan blades reduces the noise while also affecting the working efficiency of the fan. SUMMARY

[0003] In view of the above, it is necessary to provide a fan to solve the technical problem that the existing fan reduces noise while also affecting its own working efficiency.

[0004] The present application provides a fan, comprising: a hub; a plurality of fan blades, the plurality of fan blades are non-equidistantly arranged on the circumferential side of the hub, the fan blade comprises a first surface and a second surface opposite to the first surface, the first surface comprises a first edge, a second edge, a third edge and a fourth edge, the first edge is opposite to the second edge, the third edge is adjacent to the hub relative to the fourth edge and is connected to one side of the hub, the two ends of the third edge and the fourth edge are respectively connected to the first edge and the second edge, the first surface has a convex point and the second surface has a concave point, each fan blade comprises a cutting surface having a division line, the division line is parallel to the contour line of the outer circumferential side of the hub, the division line is located on the first surface, the intersection points of the division line and the first edge and the second edge are respectively a first intersection point and a second intersection point, the connecting line between the first intersection point and the second intersection point is a first intersection line, the relative position of the midpoint of the first intersection line and the second surface has a corresponding point, the connecting line between the corresponding point and the first intersection point is a second intersection line, the first intersection line and the second intersection line form a first projection surface, the first projection point, the second projection point, the third projection point and the fourth projection point are respectively formed on the first projection surface by the first intersection point, the second intersection point, the convex point and the concave point, the connecting line between the first projection point and the third projection point forms a first connecting line, the second projection point and the fourth projection point form a second connecting line, and the included angle between the first connecting line and the second connecting line is defined as a first included angle, the angles of the first included angles of adjacent fan blades are different.

[0005] In some embodiments, the hub comprises a bottom surface having a center point, a projection point of the center point on a second projection plane is defined as a fifth projection point, an intersection point of the second edge and the third edge of each of the blades is defined as a third intersection point, a projection point of the third intersection point of one of the blades on the second projection plane is defined as a sixth projection point, a line connecting the sixth projection point and the fifth projection point is defined as a first connecting line, a third intersection point of another adjacent blade on the second projection plane is defined as a seventh projection point, a line connecting the seventh projection point and the fifth projection point is defined as a second connecting line, an included angle between the first connecting line and the second connecting line is defined as a second included angle, the second included angles of adjacent blades are different, and the second projection plane is parallel to the bottom surface.

[0006] In some embodiments, the difference between the first included angles of adjacent blades ranges from 1° to 4°.

[0007] In some embodiments, the difference between the second included angles of adjacent blades ranges from 2° to 15°.

[0008] In some embodiments, an included angle between the second connecting line and the bottom surface is defined as a third included angle, and the difference between the third included angles of adjacent blades ranges from 0° to 3°.

[0009] In some embodiments, the height of the first intersection point of each of the blades relative to the bottom surface is defined as a height value, and the difference between the height values of adjacent blades ranges from 0 mm to 3 mm.

[0010] In some embodiments, an intersection point of the first edge and the third edge is defined as a fourth intersection point, a projection point of the fourth intersection point on the second projection plane is defined as an eighth projection point, a line connecting the eighth projection point and the fifth projection point is defined as a third connecting line, the first edge forms a projection line on the second projection plane, an included angle between the third connecting line and the projection line is defined as a fourth included angle, and the difference between the fourth included angles of adjacent blades ranges from 0.5° to 5°.

[0011] In some embodiments, the first edge and the fourth edge, and the second edge and the fourth edge are connected by circular arcs.

[0012] In some embodiments, the number of blades ranges from 3 to 8.

[0013] In some embodiments, the hub and the plurality of blades are integrally formed.

[0014] The fan described above is connected with an external driving device through a hub, the external driving device drives the hub and the plurality of fan blades to rotate, the non-equidistant distribution of the plurality of fan blades changes the vibration amplitude of air, reduces the noise of the fan, and the first included angle of adjacent fan blades is different, so that the air inlet angle and the air outlet angle of the fan blades are changed, thereby improving the flow rate and heat dissipation performance of the fan. The plurality of fan blades of the embodiment of the application change the vibration amplitude of air, reduce the noise of the fan, and the first included angle of adjacent fan blades is different, so that the air inlet angle and the air outlet angle of the fan blades are changed, thereby improving the flow rate and heat dissipation performance of the fan. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 A perspective structural schematic diagram of the fan provided by the embodiment of the application is shown.

[0016] Figure 2 A top view schematic diagram of the fan shown in Figure 1

[0017] Figure 3 Another angle perspective structural schematic diagram of the fan shown in Figure 2

[0018] Figure 4 A distribution schematic diagram of key nodes in the first projection of the fan shown in Figure 1

[0019] A distribution schematic diagram of key nodes in the second projection of the fan shown in Figure 5 Figure 1 A distribution schematic diagram of key nodes in the third projection of the fan shown in

[0020] Figure 6 Figure 1 A distribution schematic diagram of key nodes in the fourth projection of the fan shown in

[0021] Figure 7 Figure 1 A distribution schematic diagram of key nodes in the fourth projection of the fan shown in

[0022] MAIN ELEMENT SYMBOL EXPLANATION

[0023] Fan 100

[0024] Hub 10

[0025] Bottom surface 11

[0026] Fan blade 20

[0027] First surface 21

[0028] First edge 211

[0029] Second edge 212 ​​​​​

[0030] third edge 213

[0031] fourth edge 214

[0032] second face 22

[0033] first intersection point Al

[0034] second intersection point A2

[0035] midpoint A3

[0036] corresponding point A4

[0037] first projection point A5

[0038] second projection point A6

[0039] third projection point A7

[0040] fourth projection point A8

[0041] fifth projection point A9

[0042] third intersection point A 10

[0043] sixth projection point A 11

[0044] seventh projection point A 12

[0045] fourth intersection point A 13

[0046] eighth projection point A 14

[0047] fixed point A 15

[0048] ninth projection point A 16

[0049] tenth projection point A 17

[0050] central axis L0

[0051] splitting line LI

[0052] first intersection line L2

[0053] second intersection line L3

[0054] first connecting line L4

[0055] second connecting line L5

[0056] first connection line L6

[0057] Second connecting line L7

[0058] Third connecting line L8

[0059] Projection line L9

[0060] Fourth connecting line L 10

[0061] Fifth connecting line L 11

[0062] Cutting surface F1

[0063] First projection surface F2

[0064] Second projection surface F3

[0065] First included angle θ1

[0066] Second included angle θ2

[0067] Third included angle θ3

[0068] Fourth included angle θ4

[0069] Fifth included angle θ5

[0070] Height value H DETAILED DESCRIPTION

[0071] In order to more clearly understand the purpose, features and advantages of the present application, the present application will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict. In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present application, and the described embodiments are only some of the embodiments of the present application, but not all the embodiments.

[0072] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0073] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments of the present application, and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0074] It is apparent to those skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments, and that the application can be implemented in other specific forms without departing from the spirit or essential characteristics of the application. The embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

[0075] The application provides a fan, comprising: a hub; a plurality of blades, the plurality of blades are arranged at a non-equidistant distance on the circumferential side of the hub, each blade comprises a first surface and a second surface opposite to the first surface, the first surface comprises a first edge, a second edge, a third edge and a fourth edge, the first edge is opposite to the second edge, the third edge is adjacent to the hub relative to the fourth edge and is connected to one side of the hub, the two ends of the third edge and the fourth edge are connected to the first edge and the second edge respectively, the first surface has a convex point and the second surface has a concave point, each blade comprises a cutting surface having a division line, the division line is parallel to the contour line of the outer circumferential side of the hub, the division line is located on the first surface, the intersection of the division line and the first edge and the second edge is a first intersection point and a second intersection point respectively, the line between the first intersection point and the second intersection point is a first intersection line, the opposite position of the midpoint of the first intersection line and the second surface is a third intersection point, the third intersection point is located on the cutting surface, the line between the first intersection point and the third intersection point is a second intersection line, the first intersection line and the second intersection line form a first projection surface, the first projection point, the second projection point, the third projection point and the fourth projection point are formed on the first projection surface by the first intersection point, the second intersection point, the convex point and the concave point respectively, the line between the first projection point and the third projection point is a first line, the second projection point and the fourth projection point form a second line, the included angle between the first line and the second line is defined as a first included angle, the first included angles of adjacent blades are different.

[0076] The non-equidistant distribution of the plurality of blades changes the vibration amplitude of air, reduces the noise of the fan, and changes the air inlet angle and the air outlet angle of the blades due to the different first included angles of adjacent blades, so that the flow rate and heat dissipation performance of the fan can be improved.

[0077] Some embodiments of the application will be described in detail below with reference to the accompanying drawings.

[0078] Please refer to Figure 1The embodiment of the present application provides a fan 100, which comprises a hub 10 and a plurality of fan blades 20. In the embodiment, the plurality of fan blades 20 are arranged at unequal intervals on the circumferential side of the hub 10, the hub 10 and the plurality of fan blades 20 are integrally formed, and the non-equal interval distribution of the plurality of fan blades 20 can make the amplitude of each fan blade 20 different, thereby reducing the noise generated when the fan 100 operates, and improving the use comfort of users.

[0079] The hub 10 is used for connecting an external driving device, so that the external driving device drives the hub 10 to rotate. It can be understood that, in other embodiments, the hub 10 can be a cup-shaped structure or a frustum-shaped structure. The hub 10 has a bottom surface 11 located at the bottom of the hub 10. In the embodiment, the external driving device is a motor.

[0080] In some embodiments, a plurality of heat dissipation holes (not shown in the figure) are formed on the surface of the hub 10, and the hub 10 has a central axis L0, the plurality of heat dissipation holes are uniformly distributed around the central axis L0, the heat dissipation area of the fan 100 is increased, and the heat dissipation effect of the fan 100 is further enhanced.

[0081] In some embodiments, the inner side wall of the hub 10 can be further provided with a reinforcing rib (not shown in the figure) perpendicular to the bottom of the hub 10, so that the fan blade 20 does not produce violent vibration to affect the stability of the fan 100 when rotating at a high speed, and the heat dissipation performance of the fan 100 is improved.

[0082] In the embodiment, the number of fan blades 20 is 3-8. Preferably, the number of fan blades 20 is odd, so as to improve the stability and noise reduction effect of the fan 100.

[0083] The fan blade 20 comprises a first surface 21 and a second surface 22 opposite to the first surface 21, the first surface 21 comprises a first edge 211, a second edge 212, a third edge 213 and a fourth edge 214, the first edge 211 is opposite to the second edge 212, the third edge 213 is opposite to the fourth edge 214, the third edge 213 is adjacent to the hub 10 relative to the fourth edge 214, and a part of the third edge 213 is connected to one side of the hub 10, and the two ends of the third edge 213 and the fourth edge 214 are connected to the first edge 211 and the second edge 212 respectively.

[0084] The first edge 211 and the fourth edge 214, and the second edge 212 and the fourth edge 214 are connected by arc transition. When the fan 100 rotates, the arc transition of the first edge 211 and the fourth edge 214, and the arc transition of the second edge 212 and the fourth edge 214 can directly reduce the air resistance when the fan 100 rotates, thereby increasing the flow rate of the airflow, reducing the friction between the surface of the fan blade 20 and the air, and improving the heat dissipation performance of the fan 100, and facilitating the processing and molding of the fan blade 20.

[0085] Please refer to Figure 2 and Figure 3 Each fan blade 20 includes a cutting surface F1 having a split line L1, the split line L1 is parallel to the contour line of the outer circumferential side of the hub 10, the split line L1 is located on the first surface 21, the split line L1 intersects the first edge 211 and the second edge 212, the intersection point of the split line L1 and the first edge 211 is the first intersection point A1, the intersection point of the split line L1 and the second edge 212 is the second intersection point A2, and the line connecting the first intersection point A1 and the second intersection point A2 is the first intersection line L2. Please refer to Figure 4 The relative position of the second surface 22 and the midpoint A3 of the first intersection line L2 has a corresponding point A4, the line connecting the corresponding point A4 and the first intersection point A1 is the second intersection line L3, and the first intersection line L2 and the second intersection line L3 form a first projection surface F2.

[0086] The first surface 21 is a convex curved surface structure, and the second surface 22 is a concave curved surface structure. The first surface has a convex point (not shown in the figure), which is located at the curved convex position of the first surface 21. The second surface 22 has a concave point (not shown in the figure), which is located at the curved concave position of the second surface 22.

[0087] Please refer to Figure 5 The first intersection point A1, the second intersection point A2, the convex point, and the concave point form the first projection point A5, the second projection point A6, the third projection point A7, and the fourth projection point A8 on the first projection surface F2, respectively. The line connecting the first projection point A5 and the third projection point A7 forms a first line L4, the second projection point A6 and the fourth projection point A8 form a second line L5, the included angle between the first line L4 and the second line L5 is defined as a first included angle θ1, and the angles of the first included angles θ1 of adjacent fan blades 20 are different. In this embodiment, the angles of the first included angles θ1 of adjacent fan blades 20 are different, which can change the inlet angle and outlet angle of the fan blade 20, improve the flow rate of the fan blade 20 during rotation, and thereby improve the heat dissipation performance of the fan 100, and at the same time avoid reducing the heat dissipation performance of the fan 100 due to the non-equidistant distribution of the fan blades 20. Preferably, the angle difference of the first included angles θ1 of two adjacent fan blades 20 is in the range of 1°-4°.

[0088] Please refer toFigure 1 and Figure 6 The bottom surface 11 of the hub 10 has a center point (not shown in the figure), and the projection of the center point on the second projection plane F3 is defined as a fifth projection point A9. The intersection point of the second edge 212 and the third edge 213 of each fan blade 20 is defined as a third intersection point A 10 The third intersection point A 10 of a fan blade 20 has a projection point on the second projection plane F3, which is defined as a sixth projection point A 11 The sixth projection point A 11 and the fifth projection point A9 are connected to define a first connecting line L6. The third intersection point A 10 of the adjacent fan blade 20 has a seventh projection point A 12 on the second projection plane F3. The seventh projection point A 12 and the fifth projection point A9 are connected to define a second connecting line L7. The included angle between the first connecting line L6 and the second connecting line L7 is defined as a second included angle θ2. The angles of the second included angles θ2 of the adjacent fan blades 20 are different. In the embodiment, the angle difference of the second included angles θ2 of the adjacent fan blades 20 ranges from 2° to 15°. When the angle difference of the second included angles θ2 of the adjacent fan blades 20 is less than 2°, the noise of the non-equidistant distribution of the plurality of fan blades 20 and the equidistant distribution of the plurality of fan blades 20 is approximately equal, and the noise reduction effect is not significant. When the angle difference of the second included angles θ2 of the adjacent fan blades 20 is greater than 15°, the fan 100 is prone to deflection when rotating, and the noise reduction effect is not significantly improved. The second projection plane F3 is parallel to the bottom surface 11.

[0089] In some embodiments, referring to Figure 2 and Figure 6 The second edge 212 of each fan blade 20 is provided with a plurality of fixed points A 15 A fixed point A 15 of a fan blade 20 and the third intersection point A 10 have a first length (not shown in the figure). The projection of the fixed point A 15 on the second projection plane F3 is defined as a ninth projection point A 16 The fixed point A 15 of the adjacent fan blade 20 and the third intersection point A 10 have a second length (not shown in the figure). The projection of the fixed point A 15 of the adjacent fan blade 20 on the second projection plane F3 is defined as a tenth projection point A 17 The first length and the second length are equal. The ninth projection point A 16 and the fifth projection point A9 are connected to define a fourth connecting line L 10 The tenth projection point A 17 and the fifth projection point A9 are connected to define a fifth connecting line L11 , the fourth connecting line L 10 and the fifth connecting line L 11 forms a fifth included angle θ5, the fifth included angle θ5 and the second included angle θ2 are different, so as to reduce the noise generated by the non-equidistant distribution of the fan blades 20.

[0090] Please refer again to Figure 5 , the included angle between the second connecting line L5 and the bottom surface 11 is defined as a third included angle θ3, the third included angle θ3 of the adjacent fan blades 20 is different, so that the air flow channel between the adjacent fan blades 20 is also different, thereby avoiding reducing the flow field stability when the fan blades 20 are non-equidistantly distributed, so that the fan 100 maintains the heat dissipation performance of the fan 100 while reducing noise. In this embodiment, the difference between the third included angle θ3 of the adjacent fan blades 20 is 0°-3°.

[0091] The height of the first intersection point A1 of each fan blade 20 relative to the bottom surface 11 is defined as a height value H, the height value H of the adjacent fan blades 20 is different, and the difference between the height value H of the adjacent fan blades 20 is 0mm-3mm. By setting the height value H of the plurality of fan blades 20, the air flow channel between the adjacent fan blades 20 can be changed, thereby improving the flow field stability of the fan 100, while maintaining the heat dissipation performance of the fan 100, the noise generated by the operation of the fan 100 can also be reduced.

[0092] Please refer to Figure 1 and Figure 7 , the intersection point of the first edge 211 and the third edge 213 is defined as a fourth intersection point A 13 , the fourth intersection point A 13 the projection point on the second projection surface F3 is defined as an eighth projection point A 14 , the eighth projection point A 14 the connecting line between the fifth projection point A9 and the eighth projection point A is defined as a third connecting line L8, the first edge 211 forms a projection line L9 on the second projection surface F3, and the included angle between the third connecting line L8 and the projection line L9 is defined as a fourth included angle θ4. Since the fan blade 20 is arc-shaped, the fourth included angle θ4 of the adjacent fan blades 20 is different, so as to change the bending degree of the adjacent fan blades 20, thereby changing the inlet angle and outlet angle of the fan blade 20, and thereby improving the flow rate when the fan 100 rotates, so that the fan 100 maintains the heat dissipation performance while greatly reducing noise. Preferably, the difference between the fourth included angle θ4 of the adjacent fan blades 20 is 0.5°-5°.

[0093] In some embodiments, the first edge 211 is an arc edge, and the first edge 211 forms a projection line L9 on the second projection surface F3, the projection line L9 has a tangent line (not shown) at the eighth projection point A 14 which forms a fourth included angle θ4 with the third connecting line L8.

[0094] The implementation process of the embodiment of the application is: starting the external driving device, the external driving device rotates through the hub 10 and the plurality of fan blades 20, the fan blades 20 generate air flow by beating air, the second included angle θ2 of adjacent fan blades 20 is different, so that the plurality of fan blades 20 are distributed in a non-equidistant manner, thereby changing the vibration amplitude of air, reducing the noise of the fan 100, at the same time, the first included angle θ1 and the fourth included angle θ4 of adjacent fan blades 20 are different, so as to change the air inlet angle and the air outlet angle of the fan blade 20, thereby improving the flow rate of the fan 100, the angle and height value H of the third included angle θ3 of adjacent fan blades 20 are different, so as to change the air flow channel between adjacent fan blades 20, thereby improving the flow field stability of the fan 100, and further avoiding the reduction of the heat dissipation performance of the fan 100 when the fan blades 20 are distributed in a non-equidistant manner.

[0095] The fan 100 described above is connected to the external driving device through the hub 10, the external driving device drives the hub 10 and the plurality of fan blades 20 to rotate, the non-equidistant distribution of the plurality of fan blades 20 changes the vibration amplitude of air, reduces the noise of the fan 100, at the same time, the first included angle θ1 of adjacent fan blades 20 is different, thereby changing the air inlet angle and the air outlet angle of the fan blade 20, thereby improving the flow rate of the fan 100, and further improving the heat dissipation performance of the fan 100. The embodiment of the application changes the vibration amplitude of air by the non-equidistant distribution of the plurality of fan blades 20, reduces the noise of the fan 100, at the same time, the first included angle θ1 of adjacent fan blades 20 is different, so as to change the air inlet angle and the air outlet angle of the fan blade 20, thereby improving the flow rate and the heat dissipation performance of the fan 100.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the application and are not limiting. Although the application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the application.

Claims

1. A fan, characterized by, Comprising: a hub; a plurality of blades, the plurality of blades being non-equidistantly arranged on a circumferential side of the hub, each of the plurality of blades comprising a first surface and a second surface opposite to the first surface, the first surface comprising a first edge, a second edge, a third edge and a fourth edge, the first edge being opposite to the second edge, the third edge being adjacent to the fourth edge relative to the hub and connected to one side of the hub, both ends of the third edge and the fourth edge being connected to the first edge and the second edge respectively, the first surface having a convex point and the second surface having a concave point, each of the plurality of blades comprising a cutting surface having a cutting line, the cutting line being parallel to a contour line of the circumferential side of the hub, the cutting line being located on the first surface, an intersection of the cutting line with the first edge and the second edge being a first intersection and a second intersection respectively, a line connecting the first intersection and the second intersection being a first intersection line, a corresponding point of the second surface relative to a midpoint of the first intersection line being a second intersection line, the first intersection line and the second intersection line forming a first projection surface, the first intersection, the second intersection, the convex point and the concave point forming a first projection point, a second projection point, a third projection point and a fourth projection point on the first projection surface respectively, a line connecting the first projection point and the third projection point being a first line, the second projection point and the fourth projection point forming a second line, an included angle between the first line and the second line being defined as a first included angle, the first included angle of adjacent blades being different.

2. The fan of claim 1, wherein: the hub comprises a bottom surface having a center point, a projection point of the center point on a second projection surface being defined as a fifth projection point, an intersection of the second edge and the third edge of each blade being defined as a third intersection, a projection point of the third intersection of one blade on the second projection surface being defined as a sixth projection point, a line connecting the sixth projection point and the fifth projection point being defined as a first connecting line, a projection point of the third intersection of another adjacent blade on the second projection surface being defined as a seventh projection point, a line connecting the seventh projection point and the fifth projection point being defined as a second connecting line, an included angle between the first connecting line and the second connecting line being defined as a second included angle, the second included angle of adjacent blades being different, the second projection surface being parallel to the bottom surface.

3. The fan of claim 1, wherein: a difference of the first included angle of adjacent blades ranges from 1° to 4°.

4. The fan of claim 2, wherein: a difference of the second included angle of adjacent blades ranges from 2° to 15°.

5. The fan of claim 2, wherein: an included angle between the second line and the bottom surface being defined as a third included angle, a difference of the third included angle of adjacent blades ranges from 0° to 3°.

6. The fan of claim 2, wherein: The height of the first intersection point of each of the fan blades relative to the bottom surface is defined as a height value, and the difference between the height values of adjacent fan blades ranges from 0 mm to 3 mm.

7. The fan of claim 2, wherein: The intersection point of the first edge and the third edge is defined as a fourth intersection point, the projection point of the fourth intersection point on the second projection plane is defined as an eighth projection point, the line connecting the eighth projection point and the fifth projection point is defined as a third connecting line, the first edge forms a projection line on the second projection plane, and the included angle between the third connecting line and the projection line is defined as a fourth included angle, and the difference between the fourth included angles of adjacent fan blades ranges from 0.5° to 5°.

8. The fan of claim 1, wherein: The first edge and the fourth edge and the second edge and the fourth edge are connected by circular arcs.

9. The fan of claim 1, wherein: The number of fan blades is 3-8.

10. The fan of claim 1, wherein: The hub and the plurality of fan blades are integrally formed.

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