CN110612397A

CN110612397A - Centrifugal fan and electronic equipment

Info

Publication number: CN110612397A
Application number: CN201880012686.2A
Authority: CN
Inventors: 李强; 罗堃宇; 余强; 崔杰
Original assignee: Shenzhen Dajiang Innovations Technology Co Ltd
Current assignee: Shenzhen Dajiang Innovations Technology Co Ltd; SZ DJI Innovations Technology Co Ltd
Priority date: 2018-07-27
Filing date: 2018-07-27
Publication date: 2019-12-24
Also published as: WO2020019294A1

Abstract

An electronic apparatus (200) and a centrifugal fan (100) thereof. The centrifugal fan (100) comprises a volute (10) and an impeller (20) installed on the volute (10), wherein the impeller (20) comprises an impeller shaft (21) and a plurality of blades (22), the impeller shaft (21) drives the plurality of blades (22) to rotate so that any point on the blade (22) makes circular motion around the impeller shaft (21), the plurality of blades (22) are arranged on an outer peripheral wall (211) of the impeller shaft (21) at intervals, the blades (22) extend from the outer peripheral wall (211) towards a direction far away from the impeller shaft (21), an included angle (alpha) formed by a first tangent line (L1) of any point of the blade (22) towards the extending direction of the blade and a second tangent line (L2) of the point on the circumference towards the rotating direction of the blade forms an obtuse angle, and the included angle (alpha) formed by each point on the blade (22) is gradually reduced along the direction far away from the impeller shaft (21); the blade (22) comprises a connecting end (221) and a free end (222) which are opposite to each other, the blade (22) comprises a windward side (223), the included angle (alpha 1) of the windward side (223) at the intersection of the connecting end (221) and the outer peripheral wall (211) is 164.5 degrees +/-5 degrees, and the included angle (alpha 2) of the windward side (223) at the end point of the free end (222) is 102.7 degrees +/-5 degrees. The centrifugal fan (100) generates large air volume and high heat dissipation efficiency.

Description

Centrifugal fan and electronic equipment

Technical Field

The present disclosure relates to fans, and particularly to a centrifugal fan and an electronic device.

Background

In the existing electronic devices (for example, an unmanned aerial vehicle, a remote controller, an unmanned vehicle, a notebook computer, etc.), heat is generally dissipated from the mobile device by a small centrifugal fan, but the small centrifugal fan in the prior art has large power consumption, small air volume and low heat dissipation efficiency, and is not beneficial to dissipating heat from the electronic device by the centrifugal fan.

Disclosure of Invention

The embodiment of the invention provides a centrifugal fan and electronic equipment.

The centrifugal fan comprises a volute and an impeller arranged in the volute, wherein the impeller comprises an impeller shaft and a plurality of blades, the impeller shaft drives the plurality of blades to rotate so that any point on the blade does circular motion around the impeller shaft, the impeller shaft comprises an outer peripheral wall, the plurality of blades are arranged on the outer peripheral wall at intervals, the blades extend from the outer peripheral wall towards a direction far away from the impeller shaft, an obtuse included angle is formed between a first tangent line of any point of the blade towards the extending direction of the blade and a second tangent line of the point on the periphery towards the rotating direction of the blade, and the included angle formed at each point on the blade is gradually reduced along the direction far away from the impeller shaft; the blade is including link and the free end that backs on the other hand, the link is connected on the periphery wall, the blade includes the windward side, the windward side is the cambered surface, the windward side is in the link with the crossing department of periphery wall the contained angle is 164.5 ° ± 5 °, the windward side is in the contained angle of the endpoint of free end is 102.7 ° ± 5 °.

The electronic device of the embodiment of the invention comprises a body and the centrifugal fan of the embodiment, wherein the centrifugal fan is arranged on the body and is used for cooling the body.

In the electronic device and the centrifugal fan according to the embodiments of the present invention, an obtuse angle is formed between a first tangent line of any point of the blade in the extending direction of the blade and a second tangent line of the point in the circumferential direction of the blade, and the included angle formed at each point of the blade is gradually reduced in the direction away from the impeller shaft, so that the centrifugal fan according to the present invention generates a larger air volume and a higher heat dissipation efficiency at the same power compared to the conventional centrifugal fan.

Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a perspective view of a centrifugal fan according to some embodiments of the present invention.

FIG. 2 is a schematic plan view of a centrifugal fan according to certain embodiments of the present invention.

Fig. 3 and 4 are schematic plan views of volutes in centrifugal fans according to certain embodiments of the present invention.

Figure 5 is a cross-sectional view of the volute of figure 4 taken along line V-V.

Fig. 6 is a schematic plan view of an impeller in a centrifugal fan according to some embodiments of the present invention.

Fig. 7 and 8 are sectional views of the impeller of fig. 6 taken along line VII-VII.

Fig. 9 is a schematic plan view of an impeller in a centrifugal fan according to some embodiments of the present invention.

Fig. 10 is a cross-sectional view of the impeller of fig. 9 taken along line X-X.

FIG. 11 is a schematic plan view of an electronic device in accordance with certain embodiments of the invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

Referring to fig. 1 and 7, a centrifugal fan 100 according to an embodiment of the present invention includes a volute 10 and an impeller 20 disposed in the volute 10. The impeller 20 comprises an impeller shaft 21 and a plurality of blades 22, the impeller shaft 21 drives the plurality of blades 22 to rotate so that any point on the blade 22 makes a circular motion around the impeller shaft 21, the impeller shaft 21 comprises an outer peripheral wall 211, the plurality of blades 22 are arranged on the outer peripheral wall 211 at intervals, the blades 22 extend from the outer peripheral wall 211 towards a direction far away from the impeller shaft 21, an included angle α which is an obtuse angle is formed between a first tangent line L1 of any point of the blade 22 towards the extending direction of the blade 22 and a second tangent line L2 of the point on the circumference towards the rotating direction of the blade 22, and the included angle formed at each point on the blade 22 gradually decreases along the direction far away from the impeller shaft 21. The blade 22 comprises a connecting end 221 and a free end 222 which are opposite to each other, the connecting end 221 is connected to the outer circumferential wall 211, the blade 22 comprises a windward side 223, the windward side 223 is an arc surface, an included angle alpha 1 of the windward side 223 at the intersection of the connecting end 221 and the outer circumferential wall 211 is 164.5 degrees +/-5 degrees, and an included angle alpha 2 of the windward side 223 at the final point of the free end 222 is 102.7 degrees +/-5 degrees.

Specifically, the plurality of blades 22 are provided at equal intervals on the outer peripheral wall 211. When the impeller shaft 21 rotates, the impeller shaft 21 drives the plurality of blades 22 to do circular motion around the impeller shaft 21; when the vane 22 makes a circular motion around the impeller shaft 21, any point on the vane 22 also makes a circular motion around the impeller shaft 21, and the motion locus (L) of each point on the vane 22 is circular. The included angle α between the connection end 221 and the free end 222 on the windward side 223 is larger than α 2 and smaller than α 1, and the closer to the connection end 221, the closer to α 2 the included angle α formed by the points of the windward side 223 is. The included angle alpha is greater than 102.7 DEG +/-5 DEG and less than 164.5 DEG +/-5 deg. The direction of the second tangent L2 at any point of the blade 22 is also the instantaneous velocity direction at that point. For example, the direction of the first tangent line L1 is as indicated by the arrow of L1 in fig. 7, and the direction of the second tangent line L2 is as indicated by the arrow of L2 in fig. 7.

In the centrifugal fan 100 according to the embodiment of the present invention, an included angle α of an obtuse angle is formed between a first tangent line L1 to an extending direction of the blade 22 at any point of the blade 22 and a second tangent line L2 to a rotating direction of the blade 22 on a circumference of the point, and the included angle formed at each point of the blade 22 is gradually reduced in a direction away from the impeller shaft 21, so that the centrifugal fan 100 according to the present invention generates a large amount of air and high heat dissipation efficiency at the same power as that of the conventional centrifugal fan.

Referring to fig. 1 and 2, a centrifugal fan 100 according to an embodiment of the present invention includes a volute 10 and an impeller 20 disposed in the volute 10.

Referring to fig. 3, the volute 10 includes an upper casing 11, a lower casing 12 and a sidewall 13.

The upper and lower shells 11, 12 are located at opposite ends of the volute 10, and the side wall 13 is disposed between the upper and lower shells 11, 12. Specifically, one end of the side wall 13 is connected to an edge position of the upper case 11, the other end of the side wall 13 is connected to an edge position of the lower case 12, and the upper case 11, the lower case 12 and the side wall 13 together enclose the mounting cavity 101. The upper shell 11 is provided with an air inlet 111 communicated with the mounting cavity 101, and the air inlet 111 is circular. One end of the side wall 13 is provided with an air outlet 132 communicated with the mounting cavity 101. In the present embodiment, the upper case 11 and the side wall 13 are formed integrally. The volute casing 10 is provided with a plurality of mounting holes 14 penetrating through the upper casing 11, the side wall 13 and the lower casing 12, and the plurality of mounting holes 14 are arranged at intervals and used for fixing the volute casing 10. In the present embodiment, the diameter of the air intake holes 111 is 19mm ± 5mm, for example, the diameter of the air intake holes 111 may be 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24 mm. The number of the mounting holes 14 is three, and the three mounting holes 14 are arranged around the mounting cavity 101. In other embodiments, the upper housing 11 and the side wall 13 are formed as separate bodies.

Referring to fig. 4 and 5, the side wall 13 is formed with a tongue 102 protruding toward the mounting cavity 101, and the center of the air inlet hole 111 is taken as the origin of coordinates O, the position from the origin of coordinates O to the midpoint of the tongue 102 is taken as 0 °, and the direction of rotation of the impeller 20 is taken as the forward direction.

At the 0 ° position (point a), the distance between the inner surface 131 of the side wall 13 and the origin of coordinates O is 11.97mm ± 5mm, that is, the length of the line segment OA is 11.97mm ± 5 mm. At an angle of 22.68 deg. from the 0 deg. position (point B), the distance between the inner surface 131 of the side wall 13 and the origin of coordinates O is 12.11mm ± 5mm, that is, the length of the line segment OB is 12.11mm ± 5 mm. At an angle of 97.66 deg. from the 0 deg. position (point C), the distance between the inner surface 131 of the side wall 13 and the origin of coordinates O is 13.31mm + -5 mm, that is, the length of the line segment OC is 13.31mm + -5 mm. At an angle of 149.18 deg. from the 0 deg. position (point D), the distance between the inner surface 131 of the side wall 13 and the origin of coordinates O is 14.17mm + -5 mm, that is, the length of the line segment OD is 14.17mm + -5 mm. At an angle of 206.75 deg. from the 0 deg. position (point E), the distance between the inner surface 131 of the side wall 13 and the origin of coordinates O is 15.11mm + -5 mm, i.e., the length of line segment OE is 15.11mm + -5 mm. At an angle OF 236.34 deg. from the 0 deg. position (point F), the distance between the inner surface 131 OF the side wall 13 and the origin OF coordinates O is 15.59mm + -5 mm, that is, the length OF the line segment OF is 15.59mm + -5 mm.

The length of the line segment OA can be 6.97mm, 7.97mm, 8.97mm, 9.97mm, 10.97mm, 11.97mm, 12.97mm, 13.97mm, 14.97mm, 15.97mm and 16.97 mm. The length of the line segment OB may be 7.11mm, 8.11mm, 9.11mm, 10.11mm, 11.11mm, 12.11mm, 13.11mm, 14.11mm, 15.11mm, 16.11mm, 17.11 mm. The length of line segment OC may be 8.31mm, 9.31mm, 10.31mm, 11.31mm, 12.31mm, 13.31mm, 14.31mm, 15.31mm, 16.31mm, 17.31mm, 18.31 mm. The length of the line segment OD may be 9.17mm, 10.17mm, 11.17mm, 12.17mm, 13.17mm, 14.17mm, 15.17mm, 16.17mm, 17.17mm, 18.17mm, 19.17 mm. The length of line segment OE may be 10.11mm, 11.11mm, 12.11mm, 13.11mm, 14.11mm, 15.11mm, 16.11mm, 17.11mm, 18.11mm, 19.11mm, 20.11 mm. The length OF the line segment OF may be 10.59mm, 11.59mm, 12.59mm, 13.59mm, 14.59mm, 15.59mm, 16.59mm, 17.59mm, 18.59mm, 19.59mm, 20.59 mm. The length size relationship OF the line segment OA, the line segment OB, the line segment OC, the line segment OD, the line segment OE and the line segment OF is satisfied: line segment OA is smaller than line segment OB, line segment OB is smaller than line segment OC, line segment OC is smaller than line segment OD, line segment OD is smaller than line segment OE, and line segment OE is smaller than line segment OF. For example, when the length OF the line segment OA is 6.97mm, the lengths OF the line segments OB, OC, OD, OE and OF may be 7.11mm, 8.31mm, 9.17mm, 10.11mm and 10.59mm, respectively; when the length OF the line segment OA is 11.97mm, the lengths OF the line segments OB, OC, OD, OE and OF may be 12.11mm, 13.31mm, 14.17mm, 15.11mm and 15.59mm, respectively.

The contour line of the inner surface 131 of the side wall 13 from the point a to the point F (C1 line) is obtained by connecting the point a, the point B, the point C, the point D, the point F, the point D. The curve of the rounded transition may be a fitted curve, that is, a contour line (line C1) of the inner surface 131 of the sidewall 13 from point a to point F may be obtained by curve-fitting points a, B, C, D, E, and F.

At an angle of-2.48 deg. from the 0 deg. position (point G), the distance between the inner surface 131 of the side wall 13 and the origin of coordinates O is 18.38mm + -5 mm, i.e. the length of the line segment OG is 18.38mm + -5 mm. The line drawn by the contour line of the inner surface 1331 of the side wall 13 between the 0 position and the position at an angle of-2.48 ° to the 0 position is a straight line (C2). The length of line segment OG may be 13.38mm, 14.38mm, 15.38mm, 16.38mm, 17.38mm, 18.38mm, 19.38mm, 20.38mm, 22.38mm, 23.38 mm. The length of the line segment OG is greater than the length of the line segment OA, for example, when the length of the line segment OA is 6.97mm, the length of the line segment OG may be 13.38 mm; when the length of the line segment OA is 11.97mm, the length of the line segment OG may be 18.38 mm. The G point is located on the outlet hole 132.

At an angle of 277.06 deg. from the 0 deg. position (point H), the distance between the inner surface 131 of the side wall 13 and the origin of coordinates O is 21.69mm + -5 mm, that is, the length of the line segment OH is 21.69mm + -5 mm. A line connecting a contour line of the inner surface 131 of the side wall 13 at 236.34 ° from the 0 ° position (point F) and 277.06 ° from the 0 ° position (point H) is a straight line (C3). Line C3 is tangent to contour line C1 at point F. The length of the line segment OH may be 16.69mm, 17.69mm, 18.69mm, 19.69mm, 20.69mm, 21.69mm, 22.69mm, 23.69mm, 24.69mm, 25.69mm, 26.69 mm. The length OF the line segment OH is greater than the length OF the line segment OF, for example, when the length OF the line segment OF is 10.59mm, the length OF the line segment OH may be 16.69 mm; when the length OF the line segment OF is 15.59mm, the length OF the line segment OH may be 21.69 mm. The point H is located on the air outlet 132, and the point H and the point G are located at opposite ends of the air outlet 132.

Referring to fig. 6 and 7, the impeller 20 is rotatably mounted in the mounting cavity 101. The impeller 20 includes an impeller shaft 21 and a plurality of blades 22.

Referring to fig. 9 and 10, the impeller shaft 21 is rotatably mounted on the lower casing 12, and the axis 212 of the impeller shaft 21 passes through the center 112 of the air inlet hole 111. The impeller shaft 21 includes a motor connecting portion 213 and a blade connecting portion 214. The motor connecting portion 213 is located in the middle of the impeller shaft 21 and is shaped like a disk, a mounting hole 215 is formed in the center of the motor connecting portion 213, the mounting hole 215 is used for mounting a motor rotating shaft (not shown) of the motor 23, and the axis 212 of the impeller shaft 21 is the axis 212 of the mounting hole 215. The vane connecting portion 214 is located at an edge of the impeller shaft 21 and surrounds the motor connecting portion 213, and the vane connecting portion 214 is formed to extend from the edge of the impeller shaft 21 toward an axial direction of the mounting hole 215. The vane connecting portion 214 is cylindrical, an outer surface of the vane connecting portion 214 away from the motor connecting portion 213 is an outer circumferential wall 211 of the impeller shaft 21, and a cross section of the outer circumferential wall 211 perpendicular to the axis 212 is circular. The blade connecting portion 214 and the motor connecting portion 213 jointly enclose an accommodating cavity 201, the accommodating cavity 201 is located between the motor connecting portion 213 and the lower shell 12, and the motor 23 is fixed on the lower shell 12 and installed in the accommodating cavity 201. In other embodiments, the blade connecting portion 214 further has a through hole 217 communicating with the receiving cavity 201, so that the air pressure in the receiving cavity 201 is substantially the same as the air pressure in the air inlet hole 111.

The plurality of blades 22 are distributed at equal intervals on the outer peripheral wall 211. When the impeller shaft 21 rotates, the impeller shaft 21 drives the plurality of blades 22 to do circular motion around the impeller shaft 21; when the vane 22 makes a circular motion around the impeller shaft 21, any point on the vane 22 also makes a circular motion around the impeller shaft 21, and the motion locus (L) of each point on the vane 22 is circular. The blade 22 is the sheet structure, and the blade 22 is including connecting portion 225 and the free portion 226 that connects, and connecting portion 225 is including the link of keeping away from free portion 226 one end, and free portion 226 is including the free end 222 of keeping away from connecting portion 225 one end, and link 221 and free end 222 are located the blade 22 and carry on the opposite directions both ends mutually, and link 221 connects on periphery wall 211. The width of the connecting portion 225 (the width direction is parallel to the axis 212) gradually increases in the direction from the connecting end 221 to the free end 222, and the width of the free portion 226 remains substantially constant.

The blade 22 comprises opposite windward sides 223 and leeward sides 224, the windward sides 223 connecting the connecting ends 221 and the free ends 222, the windward sides 223 being located on the side of the blade 22 close to the direction of rotation of the impeller 20. The windward side 223 has an arc shape in cross section in a direction perpendicular to the axis 212, and the arc shape may be a circular arc or an elliptical arc. The leeward surface 224 is arcuate in cross-section in a direction perpendicular to the axis 212, and the arcuate shape may be a circular arc or an elliptical arc. The blade 22 of the embodiment of the present invention has an arc sheet structure, specifically, the windward side 223 and the leeward side 224 are both arc surfaces, and the center of the arc surface of the windward side 223 coincides with the center of the arc surface of the leeward side 224. The radius of the circle on which the circular arc of the leeward side 224 is located is 8.2mm, the radius of the windward side 223 (the radius of the circle on which the circular arc of the windward side 223 is located) is smaller than the radius of the leeward side 224, and the difference between the radius of the leeward side 224 (the radius of the circle on which the circular arc of the leeward side 224 is located) and the radius of the windward side 223 is equal to the thickness T of the blade 22.

Each vane 22 extends from the outer peripheral wall 211 in a direction away from the impeller shaft 21, and a first tangent L1 to the extending direction of the vane 22 at any point of the vane 22 forms an obtuse angle α with a second tangent L2 to the point on the circumference in the rotating direction of the vane 22. The angle α formed at each point on the vane 22 decreases in a direction away from the impeller shaft 21 (i.e., in a direction from the attachment end 221 to the free end 222). The included angle α formed at each point on the windward side 223 is also obtuse and gradually decreases in the direction from the connecting end 221 to the free end 222.

Referring to fig. 8, specifically, the angle α 1 of the windward side 223 at the intersection of the connecting end 221 and the outer peripheral wall 211 is 164.5 ° ± 5 °, and the angle α 2 of the windward side 223 at the end point of the free end 222 is 102.7 ° ± 5 °. Wherein α 1 may be 159.5 °, 160.5 °, 161.5 °, 162.5 °, 163.5 °, 164.5 °, 165.5 °, 166.5 °, 167.5 °, 168.5 °, 169.5 °. α 2 may be 97.7 °, 98.7 °, 99.7 °, 100.7 °, 101.7 °, 102.7 °, 103.7 °, 104.7 °, 105.7 °, 106.7 °, 107.7 °. The included angle α between the connection end 221 and the free end 222 on the windward side 223 is larger than α 2 and smaller than α 1, and the closer to the connection end 221, the closer to α 2 the included angle α formed by the points of the windward side 223 is.

Referring to fig. 7, the impeller 20 includes an impeller inner diameter d1 and an impeller outer diameter d2, wherein the impeller inner diameter d1 is the diameter of the outer peripheral wall 211, and the impeller outer diameter d2 is the diameter of the contour line of the circular motion of the free end 222. The impeller inner diameter d1 is 14.5mm + -3 mm, the impeller inner diameter d1 may be 11.5mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, 14.5mmz, 15mm, 15.5mm, 16mm, 16.5mm, 17mm, 17.5 mm. The impeller outer diameter d2 is 22mm + -5 mm, and the impeller outer diameter d2 can be 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27 mm. The impeller inner diameter d1 is smaller than the diameter of the air inlet hole 111, and the impeller outer diameter d2 is larger than the diameter of the air inlet hole 111. For example, when the diameter of the intake hole 111 is 19mm, the impeller inner diameter d1 may be 14.5mm, and the impeller outer diameter d2 may be 22 mm; when the diameter of the intake hole 111 is 14mm, the impeller inner diameter d1 may be 11.5mm, and the impeller outer diameter d2 may be 17 mm.

The thickness T of the blade 22 is the distance between the windward side 223 and the leeward side 224, the thickness T of the blade 22 is 0.4mm +/-0.06 mm, and the thickness T of the blade 22 can be 0.34mm, 0.36mm, 0.38mm, 0.40mm, 0.42mm, 0.44mm and 0.46 mm. Since the radius of the circle on which the circular arc of the leeward side 224 is located is 8.2mm, the radius of the windward side 223 (the radius of the circle on which the circular arc of the windward side 223 is located) is 7.8mm ± 0.06mm, for example, when the thickness T of the blade 22 is 0.34mm, the radius of the windward side 223 is 7.86 mm; when the thickness T of the blade 22 is 0.4mm, the radius of the windward side 223 is 7.8 mm; when the thickness T of the blade 22 is 0.46mm, the radius of the windward side 223 is 7.74 mm. The number of the blades 22 is 23 pieces +/-2 pieces, and the number of the blades 22 can be 21 pieces, 22 pieces, 23 pieces, 24 pieces and 25 pieces.

In the centrifugal fan 100 according to the embodiment of the present invention, an included angle at an obtuse angle is formed between a first tangent line of any point of the blade 22 in the extending direction of the blade 22 and a second tangent line of the point in the rotating direction of the blade 22 on the circumference, and the included angle formed at each point of the blade 22 is gradually reduced in the direction away from the impeller shaft 21, so that the centrifugal fan 100 according to the present invention generates a larger air volume and a higher heat dissipation efficiency at the same power compared to the conventional centrifugal fan.

Further, the contour shape of the inner surface 131 of the side wall 13 of the present embodiment can increase the air volume generated by the centrifugal fan 100 and increase the heat radiation efficiency in combination with the shape of the blade 22 of the present embodiment. The vane shaft 21 is provided with a housing chamber 201, so that the motor 23 can be mounted in the housing chamber 201, and the weight of the vane shaft 21 can be reduced.

Referring to fig. 5, in some embodiments, the coordinate origin O is 0 ° to the midpoint of the tongue 102, which is forward in the direction of rotation of the impeller 20. At an angle of 57.92 deg. to the 0 deg. position (point I), the distance between the inner surface 131 of the side wall 13 and the origin of coordinates (point O) is 12.7mm + -5 mm, i.e. the length of the line segment OI is 12.7mm + -5 mm. At an angle of 123.99 deg. from the 0 deg. position (point J), the distance between the inner surface 131 of the side wall 13 and the origin of coordinates (point O) is 13.72mm + -5 mm, that is, the length of the line segment OJ is 13.72mm + -5 mm. At an angle of 178.64 ° from the 0 ° position (point K), the distance between the inner surface 131 of the side wall 13 and the origin of coordinates (point O) is 14.64mm ± 5mm, that is, the length of the line segment OK is 14.64mm ± 5 mm.

Wherein, the length of the line section OI can be 7.7mm, 8.7mm, 9.7mm, 10.7mm, 11.7mm, 12.7mm, 13.7mm, 14.7mm, 15.7mm, 16.7mm and 17.7 mm. The length of the line segment OJ may be 8.72mm, 9.72mm, 10.72mm, 11.72mm, 12.72mm, 13.72mm, 14.72mm, 15.72mm, 16.72mm, 17.72mm, 18.72 mm. The length of the line segment OK may be 9.64mm, 10.64mm, 11.64mm, 12.64mm, 13.64mm, 14.64mm, 15.64mm, 16.64mm, 17.64mm, 18.64mm, 19.64 mm. The length size relations OF the line segment OA, the line segment OB, the line segment OI, the line segment OC, the line segment OJ, the line segment OD, the line segment OK, the line segment OE and the line segment OF are as follows: line OA is smaller than line OB, line OB is smaller than line OI, line OI is smaller than line OC, line OC is smaller than line OI, line OI is smaller than line OD, line OD is smaller than line OK, line OK is line OE, and line OE is smaller than line OF. For example, when the length OF the line segment OA is 6.97mm, the lengths OF the line segments OB, OI, OC, OJ, OD, OK, OE and OF may be 7.11mm, 7.7mm, 8.31mm, 8.72mm, 9.17mm, 9.64mm, 10.11mm and 10.59mm, respectively; when the length OF the line segment OA is 11.97mm, the lengths OF the line segments OB, OI, OC, OJ, OD, OK, OE and OF may be 12.11mm, 12.7mm, 13.31mm, 13.72mm, 14.17mm, 14.64mm, 15.11mm and 15.59mm, respectively.

A 0 ° position (point a), a 0 ° position (point B), an 57.92 ° position (point I), a 97.66 ° position (point C), an 123.99 ° position (point J), a 149.18 ° position (point D), a 178.64 ° position (point K), an 206.75 ° position (point E) and a 236.34 ° position (point F) on the inner surface 131 of the side wall 13 are connected in this order by a curve that is smoothly transitioned, that is, a contour line (C1 line) from the point a to the point F of the inner surface 131 of the side wall 13 is obtained by connecting the point a, the point B, the point I, the point C, the point J, the point D, the point K, the point E and the point F in this order by a curve that is smoothly transitioned. The curve of the rounded transition may be a fitted curve, that is, a contour line (line C1) of the inner surface 131 of the sidewall 13 from point a to point F may be obtained by curve-fitting points a, B, I, C, J, D, K, E and F.

In some embodiments, the 0 ° position is from the origin of coordinates O to the midpoint of tongue 102, and the forward direction is toward the rotation of impeller 20. At an angle of 3.22 ° from the 0 ° position (point L), the distance between the inner surface 131 of the side wall 13 and the origin of coordinates (point O) is 11.63mm ± 5mm, that is, the length of the line segment OL is 11.63mm ± 5 mm. At an angle of-1.46 deg. (point M) to the 0 deg. position, the distance between the inner surface 131 of the side wall 13 and the origin of coordinates (point O) is 12.52mm ± 5mm, that is, the length of the line segment OM is 12.52mm ± 5 mm.

The length of the line segment OL may be 6.63mm, 7.63mm, 8.63mm, 9.63mm, 10.63mm, 11.63mm, 12.63mm, 13.63mm, 14.63mm, 15.63mm, 16.63 mm. The length of the line segment OM may be 7.52mm, 8.52mm, 9.52mm, 10.52mm, 11.52mm, 12.52mm, 13.52mm, 14.52mm, 15.52mm, 16.52mm, 17.52 mm. The length size relation of the line segment OA, the line segment OL, the line segment OB, the line segment OM and the line segment OG needs to satisfy: line segment OL is smaller than line segment OA, line segment OA is smaller than line segment OB, line segment OB is smaller than line segment OM, and line segment OM is smaller than line segment OG. For example, when the length of line segment OA is 6.97mm, the lengths of line segments OB, OL, OM and OG may be 7.11mm, 6.63mm, 7.52mm and 13.38mm, respectively; when the length of line segment OA is 11.97mm, the lengths of line segments OB, OL, OM, and OG may be 12.11mm, 11.63mm, 12.52mm, and 18.38mm, respectively.

Contour C1 of inner surface 131 of sidewall 13 includes contours C11 and C12. The contour line of the inner surface 131 of the sidewall 13 from the L point to the F point (C11 line) is obtained by connecting the L point, the B point, the C point, the D point, the E point, and the F point in order from the L point to the F point, wherein the contour line of the inner surface 131 of the sidewall 13 from the 0 ° position is 3.22 ° (L point), the 0 ° position is 22.68 ° (B point), the 0 ° position is 97.66 ° (C point), the 0 ° position is 149.18 ° (D point), the 0 ° position is 206.75 ° (E point), and the 0 ° position is 236.34 ° (F point). The curve of the rounded transition may be a fitted curve, that is, a contour line (line C1) of the inner surface 131 of the sidewall 13 from point L to point F may be obtained by curve-fitting points L, B, C, D, E, and F. A contour line (C12) between the position at 3.22 ° (point L) and the position at 0 ° (point a) on the contour line of the inner surface 131 of the side wall 13 is a circular arc curve. Contour C12 is tangent to contour C11 at point L.

Contour C2 of inner surface 131 of sidewall 13 includes contours C21 and C22. Wherein, the contour line (C21) between the 0 degree position (point A) and the position (point M) which forms an angle of-1.46 degrees with the 0 degree position on the contour line of the inner surface 131 of the side wall 13 is a circular arc curve. The contour line C21 and the contour line C12 are two connected circular curves on the same circumference, that is, the contour line of the inner surface 131 of the sidewall 13 is formed by sequentially connecting a position (point L) at an angle of 3.22 ° with the 0 ° position, a position (point a) at 0 ° and a position (point M) at an angle of-1.46 ° with the 0 ° position. The contour line of tongue 102 is formed by arc LAM, point a being the midpoint of arc LAM, i.e., the arc length of contour line C12 is equal to the arc length of contour line C21. The contour line (C22) on the contour line of the inner surface 131 of the side wall 13 between-1.46 ° from the 0 ° position and-2.48 ° from the 0 ° position is a straight line.

In some embodiments, the 0 ° position is from the origin of coordinates O to the midpoint of tongue 102, and the forward direction is toward the rotation of impeller 20. At an angle of 3.22 ° from the 0 ° position (point L), the distance between the inner surface 131 of the side wall 13 and the origin of coordinates (point O) is 11.63mm ± 5mm, that is, the length of the line segment OL is 11.63mm ± 5 mm. The point at an angle of 3.22 ° from the 0 ° position (point L) is the closest point from the origin of coordinates O to the inner surface 131 of the side wall 13. From the position at an angle of 3.22 ° to the 0 ° (point L), the distance between the origin of coordinates O and the inner surface 131 of the side wall 13 gradually increases toward the rotation direction of the impeller 20.

Specifically, the distance between the origin of coordinates O and the inner surface 131 of the side wall 13 gradually increases from the position (point L) at an angle of 3.22 ° with respect to the 0 ° position to the position 22.68 ° (point B), from the position (point C) at an angle of 97.66 ° with respect to the 0 ° position to the position (point C), from the position (point D) at an angle of 149.18 ° with respect to the 0 ° position, from the position (point D) at an angle of 206.75 ° with respect to the 0 ° position to the position (point E), and from the position (point F) at an angle of 236.34 ° with respect to the 0 ° position.

The length size relation OF the line segment OL, the line segment OB, the line segment OC, the line segment OD, the line segment OE and the line segment OF is required to satisfy: line segment OL is smaller than line segment OB, line segment OB is smaller than line segment OC, line segment OC is smaller than line segment OD, line segment OD is smaller than line segment OE, and line segment OE is smaller than line segment OF. For example, when the length OF the line segment OL is 6.63mm, the lengths OF the line segments OB, OC, OD, OE, and OF may be 7.11mm, 8.31mm, 9.17mm, 10.11mm, and 10.59mm, respectively; when the length OF the line segment OL is 11.63mm, the lengths OF the line segments OB, OC, OD, OE, and OF may be 12.11mm, 13.31mm, 14.17mm, 15.11mm, and 15.59mm, respectively.

In some embodiments, the 0 ° position is from the origin of coordinates O to the midpoint of tongue 102, and the forward direction is toward the rotation of impeller 20. At an angle of 3.22 ° from the 0 ° position (point L), the distance between the inner surface 131 of the side wall 13 and the origin of coordinates (point O) is 11.63mm ± 5mm, that is, the length of the line segment OL is 11.63mm ± 5 mm. The point at an angle of 3.22 ° from the 0 ° position (point L) is the closest point from the origin of coordinates O to the inner surface 131 of the side wall 13. From the position at an angle of 3.22 ° to the 0 ° (point L), the distance between the origin of coordinates O and the inner surface 131 of the side wall 13 gradually increases in the direction opposite to the rotation direction of the impeller 20.

Specifically, the distance between the origin of coordinates O and the inner surface 131 of the side wall 13 gradually increases from the position (point L) at an angle of 3.22 ° from the position 0 ° to the position 0 ° through the position 0 ° (point a) at an angle of-1.46 ° from the position 0 ° to the position 0 ° (point M) and the position 0 ° at an angle of-2.48 ° from the position 0 ° to the position 0 ° (point G).

The length size relation of the line segment OL, the line segment OA, the line segment OM and the line segment OG is to satisfy: line segment OL is smaller than line segment OA, line segment OA is smaller than line segment OM, and line segment OM is smaller than line segment OG. For example, when the length of line segment OL is 6.63mm, the lengths of line segments OA, OM and OG may be 6.97mm, 7.52mm and 13.38mm, respectively; when the length of line segment OL is 11.63mm, the lengths of line segments OA, OM and OG may be 11.97mm, 12.52mm and 18.38mm, respectively.

Referring to fig. 11, an electronic device 200 according to an embodiment of the present invention includes a main body 30 and the centrifugal fan 100 according to any one of the above embodiments. The centrifugal fan 100 is mounted on the body 30 and serves to dissipate heat from the body 30. The electronic device 200 includes any one of an unmanned aerial vehicle, an unmanned vehicle, a remote controller, and a notebook computer.

In the electronic device 200 according to the embodiment of the present invention, an included angle at an obtuse angle is formed between a first tangent line of any point of the blade 22 in the extending direction of the blade 22 and a second tangent line of the point in the rotating direction of the blade 22 on the circumference, and the included angle formed at each point on the blade 22 is gradually reduced in the direction away from the impeller shaft 21, so that the centrifugal fan 100 according to the present invention generates a larger air volume and a higher heat dissipation efficiency at the same power compared to the conventional centrifugal fan.

In the description of the specification, reference to the terms "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments within the scope of the present invention, which is defined by the claims and their equivalents.

Claims

1. A centrifugal fan, comprising:

a volute; and

the impeller is arranged in the volute and comprises an impeller shaft and a plurality of blades, the impeller shaft drives the plurality of blades to rotate so that any point on the blades can do circular motion around the impeller shaft, the impeller shaft comprises an outer peripheral wall, the plurality of blades are arranged on the outer peripheral wall at intervals, the blades extend from the outer peripheral wall towards the direction far away from the impeller shaft, an obtuse included angle is formed between a first tangent line of any point of the blade towards the extending direction of the blade and a second tangent line of the point on the periphery towards the rotating direction of the blade, and the included angle formed at each point on the blades is gradually reduced along the direction far away from the impeller shaft; the blade is including link and the free end that backs on the other hand, the link is connected on the periphery wall, the blade includes the windward side, the windward side is the cambered surface, the windward side is in the link with the crossing department of periphery wall the contained angle is 164.5 ° ± 5 °, the windward side is in the contained angle of the endpoint of free end is 102.7 ° ± 5 °.

2. The centrifugal fan as claimed in claim 1, wherein the blades include a leeward surface opposite the windward surface, the leeward surface being an arc surface, a center of the arc surface of the windward surface coinciding with a center of the arc surface of the leeward surface.

3. The centrifugal fan according to claim 2, wherein the windward surface and the leeward surface are both arc surfaces, and the radius of a circle in which the arc of the leeward surface is located is 8.2 mm.

4. The centrifugal fan according to claim 1, wherein the volute comprises an upper casing, a lower casing and a side wall, the upper casing, the lower casing and the side wall together define a mounting cavity, the upper casing and the lower casing are located at opposite ends of the volute, the side wall connects the upper casing and the lower casing and surrounds the mounting cavity, the upper casing is provided with an air inlet communicated with the mounting cavity, one end of the side wall is provided with an air outlet communicated with the mounting cavity, the impeller is mounted in the mounting cavity, and an axis of the impeller shaft passes through a center of the air inlet.

5. The centrifugal fan as claimed in claim 4, wherein the side wall is formed with a tongue portion protruding toward the mounting cavity, a position from a center of the air inlet hole to a midpoint of the tongue portion is set to 0 ° with a coordinate origin, and a rotation direction toward the impeller is set to a forward direction;

at the 0 ° position, the distance between the inner surface of the sidewall and the origin of coordinates is 11.97mm ± 5 mm;

at an included angle of 22.68 degrees with the position of 0 degrees, the distance between the inner surface of the side wall and the origin of coordinates is 12.11mm +/-5 mm;

at an included angle of 97.66 degrees with the 0-degree position, the distance between the inner surface of the side wall and the origin of coordinates is 13.31mm +/-5 mm;

at an included angle of 149.18 degrees with the 0-degree position, the distance between the inner surface of the side wall and the coordinate origin is 14.17mm +/-5 mm;

at an included angle of 206.75 degrees with the 0-degree position, the distance between the inner surface of the side wall and the coordinate origin is 15.11mm +/-5 mm;

at an angle of 236.34 ° to the 0 ° position, the distance between the inner surface of the side wall and the origin of coordinates is 15.59mm ± 5 mm.

6. The centrifugal fan as claimed in claim 5, wherein the 0 ° position, the 22.68 ° position, the 97.66 ° position, the 149.18 ° position, the 206.75 ° position and the 236.34 ° position on the contour line of the inner surface of the side wall are connected in sequence by a rounded transition curve.

7. The centrifugal fan of claim 6,

at an included angle of 57.92 degrees with the 0-degree position, the distance between the inner surface of the side wall and the coordinate origin is 12.7mm +/-5 mm;

at an included angle of 123.99 degrees with the 0-degree position, the distance between the inner surface of the side wall and the coordinate origin is 13.72mm +/-5 mm;

at an angle of 178.64 ° to the 0 ° position, the distance between the inner surface of the sidewall and the origin of coordinates is 14.64mm ± 5 mm.

8. The centrifugal fan as claimed in claim 7, wherein the 0 ° position, the 22.68 ° position, the 57.92 ° position, the 97.66 ° position, the 123.99 ° position, the 149.18 ° position, the 178.64 ° position, the 206.75 ° position and the 236.34 ° position on the contour line of the inner surface of the side wall are connected in this order by a smooth transition curve.

9. The centrifugal fan according to claim 6 or 8, wherein the distance between the inner surface of the side wall and the origin of coordinates is 18.38mm ± 5mm at an angle of-2.48 ° from the 0 ° position, and a line connecting the contour line of the inner surface of the side wall between the 0 ° position and the position of-2.48 ° from the 0 ° position is a straight line.

10. The centrifugal fan according to claim 6 or 8, wherein the distance between the inner surface of the side wall and the origin of coordinates is 21.69mm ± 5mm at an angle of 277.06 ° from the 0 ° position, and a line connecting the contour line of the inner surface of the side wall between the 0 ° position and a position at an angle of 277.06 ° from the 0 ° position is a straight line.

11. The centrifugal fan of claim 5,

at an included angle of 3.22 degrees with the position of 0 degrees, the distance between the inner surface of the side wall and the origin of coordinates is 11.63mm +/-5 mm;

at an angle of-1.46 ° to the 0 ° position, the distance between the inner surface of the sidewall and the origin of coordinates is 12.52mm ± 5 mm.

12. The centrifugal fan as claimed in claim 11, wherein the contour line of the inner surface of the side wall is formed by connecting smoothly curved lines in order at an angle of 3.22 ° from the 0 ° position, at an angle of 22.68 ° from the 0 ° position, at an angle of 97.66 ° from the 0 ° position, at an angle of 149.18 ° from the 0 ° position, at an angle of 206.75 ° from the 0 ° position, and at an angle of 236.34 ° from the 0 ° position; the included angles of the contour lines of the inner surfaces of the side walls and the 0-degree position are 3.22 degrees, the included angles of the contour lines of the inner surfaces of the side walls and the 0-degree position are-1.46 degrees, and the included angles are obtained by sequentially connecting circular arc curves; and the contour line between the position with the 0 degree and the position with the 0 degree at an included angle of-1.46 degrees and the position with the 0 degree at an included angle of-2.48 degrees on the contour line of the inner surface of the side wall is a straight line.

13. The centrifugal fan of claim 12 wherein the distance between the origin of coordinates and the inner surface of the sidewall increases progressively from an angle of 3.22 ° from the 0 ° position toward the direction of rotation of the impeller.

14. The centrifugal fan as claimed in claim 1, wherein the impeller includes an impeller inner diameter and an impeller outer diameter, the impeller inner diameter is 14.5mm ± 3mm, the impeller outer diameter is 22mm ± 5mm, the thickness of the blades is 0.4mm ± 0.06mm, and the number of the blades is 23 pieces ± 2 pieces.

15. The centrifugal fan as claimed in claim 1, wherein the blade includes a connection portion connected to the outer circumferential wall and a free portion, a width of the connection portion gradually increases in a direction from the connection portion to the free portion, and a width of the free portion remains constant.

16. An electronic device, comprising:

a body; and

the centrifugal fan of any one of claims 1-15, said centrifugal fan being disposed on said body and adapted to fan heat to said body.