WO2020019294A1 - 离心风扇及电子设备 - Google Patents

离心风扇及电子设备 Download PDF

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Publication number
WO2020019294A1
WO2020019294A1 PCT/CN2018/097419 CN2018097419W WO2020019294A1 WO 2020019294 A1 WO2020019294 A1 WO 2020019294A1 CN 2018097419 W CN2018097419 W CN 2018097419W WO 2020019294 A1 WO2020019294 A1 WO 2020019294A1
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WO
WIPO (PCT)
Prior art keywords
angle
side wall
impeller
centrifugal fan
blade
Prior art date
Application number
PCT/CN2018/097419
Other languages
English (en)
French (fr)
Inventor
李强
罗堃宇
余强
崔杰
Original Assignee
深圳市大疆创新科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳市大疆创新科技有限公司 filed Critical 深圳市大疆创新科技有限公司
Priority to PCT/CN2018/097419 priority Critical patent/WO2020019294A1/zh
Priority to CN201880012686.2A priority patent/CN110612397A/zh
Publication of WO2020019294A1 publication Critical patent/WO2020019294A1/zh

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/16—Centrifugal pumps for displacing without appreciable compression
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/30—Vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings

Definitions

  • the invention relates to the field of fans, in particular to a centrifugal fan and electronic equipment.
  • the mobile devices are generally cooled by small centrifugal fans.
  • the small centrifugal fans in the prior art have large power consumption and large air volume. Small, low heat dissipation efficiency, is not conducive to centrifugal fans to cool electronic equipment.
  • Embodiments of the present invention provide a centrifugal fan and an electronic device.
  • a centrifugal fan includes a volute and an impeller disposed in the volute.
  • the impeller includes an impeller shaft and a plurality of blades, and the impeller shaft drives a plurality of the blades to rotate the blades. The point moves in a circle around the impeller shaft.
  • the impeller shaft includes an outer peripheral wall. A plurality of the blades are disposed on the outer peripheral wall at a distance from each other. The blades move away from the impeller shaft from the outer peripheral wall.
  • an obtuse angle is formed between a first tangent of an arbitrary point of the blade in the extending direction of the blade and a second tangent of the point on the circumference in the rotating direction of the blade, In a direction away from the impeller axis, the included angle formed at each point on the blade gradually decreases; the blade includes opposite ends and a free end, and the connecting ends are connected to the outer peripheral wall
  • the blade includes a windward surface, the windward surface is an arc surface, and the included angle of the windward surface at the intersection of the connecting end and the peripheral wall is 164.5 ° ⁇ 5 °, and the windward surface is at The included angle at the end of the free end 102.7 ° ⁇ 5 °.
  • An electronic device includes a main body and the centrifugal fan according to the foregoing embodiment.
  • the centrifugal fan is disposed on the main body and is used to heat the main body fan.
  • an obtuse-angled clip is formed between a first tangent line of an arbitrary point of the blade toward the blade extension direction and a second tangent line of the point on the circumference in the blade rotation direction. Angle, and in the direction away from the impeller axis, the included angles formed at various points on the blade gradually decrease, so that compared with the existing centrifugal fan, at the same power, the centrifugal fan of the present invention generates a larger amount of air, High heat dissipation efficiency.
  • FIG. 1 is a schematic 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 some embodiments of the present invention.
  • 3 and 4 are schematic plan views of a volute in a centrifugal fan according to some embodiments of the present invention.
  • Fig. 5 is a sectional view of the volute of Fig. 4 taken along the 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 cross-sectional views of the impeller in FIG. 6 along the 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 sectional view of the impeller of Fig. 9 taken along the line X-X.
  • FIG. 11 is a schematic plan view of an electronic device according to some embodiments of the present invention.
  • first and second are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as “first” and “second” may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality” is two or more, unless specifically defined otherwise.
  • the terms “installation”, “connected”, and “connected” should be understood in a broad sense unless otherwise specified and limited. For example, they may be fixed connections or removable. Connected or integrated; it can be mechanical, electrical, or can communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction of two elements relationship.
  • installation should be understood in a broad sense unless otherwise specified and limited. For example, they may be fixed connections or removable. Connected or integrated; it can be mechanical, electrical, or can communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction of two elements relationship.
  • the specific meanings of the above terms in the present invention can be understood according to specific situations.
  • the "first" or “down” of the second feature may include the first and second features in direct contact, and may also include the first and second features. Not directly, but through another characteristic contact between them.
  • the first feature is “above”, “above”, and “above” the second feature, and includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature is higher in level than the second feature.
  • the first feature is “below”, “below”, and “below” of the second feature, including the fact that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature is less horizontal than the second feature.
  • a centrifugal fan 100 includes a volute 10 and an impeller 20 disposed in the volute 10.
  • the impeller 20 includes 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 includes an outer peripheral wall 211, and the plurality of blades 22 are spaced apart from each other.
  • the blade 22 extends from the peripheral wall 211 in a direction away from the impeller shaft 21, and a first tangent line L1 of an arbitrary point of the blade 22 in the extending direction of the blade 22 and the point on the circumference toward the blade An obtuse angle ⁇ is formed between the second tangent lines L2 in the rotating direction of 22, and the included angles formed at various points on the blade 22 gradually decrease in a direction away from the impeller shaft 21.
  • the blade 22 includes opposite end 221 and free end 222.
  • the connection end 221 is connected to the outer peripheral wall 211.
  • the blade 22 includes a windward surface 223, the windward surface 223 is an arc surface, and the windward surface 223 intersects the outer peripheral wall 211 at the connection end 221.
  • the included angle ⁇ 1 is 164.5 ° ⁇ 5 °
  • the included angle ⁇ 2 of the windward surface 223 at the end of the free end 222 is 102.7 ° ⁇ 5 °.
  • a plurality of blades 22 are disposed on the outer peripheral wall 211 at equal intervals.
  • the impeller shaft 21 drives a plurality of blades 22 to make a circular motion around the impeller shaft 21; when the blade 22 makes a circular motion about the impeller shaft 21, any point on the blade 22 also makes a circular motion around the impeller shaft 21,
  • the locus (L) of each point on the blade 22 is circular.
  • the angle ⁇ between the connecting end 221 and the free end 222 on the windward surface 223 is larger than ⁇ 2 and smaller than ⁇ 1, and the closer to the connecting end 221, the closer the angle ⁇ formed by the points of the windward surface 223 is to ⁇ 2.
  • the included angle ⁇ is greater than 102.7 ° ⁇ 5 ° and less than 164.5 ° ⁇ 5 °.
  • the direction of the second tangent line L2 at an arbitrary point of the blade 22 is also the instantaneous velocity direction at that point.
  • the direction of the first tangent line L1 is the direction of the arrow of L1 in FIG. 7
  • the direction of the second tangent line L2 is the direction of the arrow of L2 in FIG. 7.
  • a first tangent line L1 at an arbitrary point of the blade 22 toward the extension direction of the blade 22 and a second tangent line L2 at the point on the circumference in the rotation direction of the blade 22 are formed.
  • the 100 produces a large amount of air and high heat dissipation efficiency.
  • 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 volute 10 includes an upper case 11, a lower case 12 and a side wall 13.
  • the upper casing 11 and the lower casing 12 are located at opposite ends of the volute casing 10, and the side wall 13 is disposed between the upper casing 11 and the lower casing 12. Specifically, one end of the side wall 13 is connected to an edge position of the upper case 11, and the other end of the side wall 13 is connected to an edge position of the lower case 12.
  • the upper case 11, the lower case 12, and the side wall 13 collectively surround the installation cavity 101.
  • the upper casing 11 is provided with an air inlet hole 111 communicating with the mounting cavity 101, and the air inlet hole 111 is circular.
  • One end of the side wall 13 is provided with an air outlet 132 communicating with the mounting cavity 101.
  • the upper case 11 and the side wall 13 are integrally formed.
  • the volute case 10 is provided with a plurality of mounting holes 14 penetrating the upper case 11, the side wall 13 and the lower case 12.
  • the plurality of mounting holes 14 are spaced from each other and are used to fix the volute case 10.
  • the diameter of the air inlet hole 111 is 19mm ⁇ 5mm.
  • the diameter of the air inlet hole 111 may be 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm.
  • the number of the mounting holes 14 is three, and the three mounting holes 14 are arranged around the mounting cavity 101.
  • the upper shell 11 and the side wall 13 are formed as separate structures.
  • a tongue portion 102 is formed protruding from the side wall 13 toward the mounting cavity 101 side.
  • the center of the air intake hole 111 is the coordinate origin O, and the coordinate origin O to the middle point of the tongue 102 is 0.
  • the direction of rotation of the impeller 20 is positive.
  • the distance between the inner surface 131 of the side wall 13 and the coordinate origin O is 11.97 mm ⁇ 5 mm, that is, the length of the line segment OA is 11.97 mm ⁇ 5 mm.
  • the distance between the inner surface 131 of the side wall 13 and the coordinate origin O is 12.11 mm ⁇ 5 mm, that is, the length of the line segment OB is 12.11 mm ⁇ 5mm.
  • the distance between the inner surface 131 of the side wall 13 and the coordinate origin O is 13.31 mm ⁇ 5 mm, that is, the length of the line segment OC is 13.31 mm ⁇ 5mm.
  • the distance between the inner surface 131 of the side wall 13 and the coordinate origin O is 14.17mm ⁇ 5mm, that is, the length of the line segment OD is 14.17mm ⁇ 5mm.
  • the distance between the inner surface 131 of the side wall 13 and the coordinate origin O is 15.11 mm ⁇ 5 mm, that is, the length of the line segment OE is 15.11 mm ⁇ 5mm.
  • the distance between the inner surface 131 of the side wall 13 and the coordinate origin O is 15.59 mm ⁇ 5 mm, that is, the length of the line segment OF is 15.59 mm ⁇ 5mm.
  • 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, 16.97mm.
  • the length of the line segment OB can be 7.11mm, 8.11mm, 9.11mm, 10.11mm, 11.11mm, 12.11mm, 13.11mm, 14.11mm, 15.11mm, 16.11mm, 17.11mm.
  • the length of the line segment OC can be 8.31mm, 9.31mm, 10.31mm, 11.31mm, 12.31mm, 13.31mm, 14.31mm, 15.31mm, 16.31mm, 17.31mm, 18.31mm.
  • the length of the line segment OD can be 9.17mm, 10.17mm, 11.17mm, 12.17mm, 13.17mm, 14.17mm, 15.17mm, 16.17mm, 17.17mm, 18.17mm, 19.17mm.
  • the length of the line segment OE can be 10.11mm, 11.11mm, 12.11mm, 13.11mm, 14.11mm, 15.11mm, 16.11mm, 17.11mm, 18.11mm, 19.11mm, 20.11mm.
  • the length of the line segment OF can be 10.59mm, 11.59mm, 12.59mm, 13.59mm, 14.59mm, 15.59mm, 16.59mm, 17.59mm, 18.59mm, 19.59mm, 20.59mm.
  • 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
  • line segment OE is smaller than the line OF.
  • the length of the line segments OB, OC, OD, OE, and OF can be 7.11mm, 8.31mm, 9.17mm, 10.11mm, and 10.59mm, respectively; when the length of the line segment OA is 11.97mm At this time, the lengths of the line segments OB, OC, OD, OE, and OF can be 12.11mm, 13.31mm, 14.17mm, 15.11mm, and 15.59mm, respectively.
  • the 0 ° position (point A) on the contour line of the inner surface 131 of the side wall 13 the angle between the 0 ° position and the 0 ° position is 22.68 ° (point B), and the angle between the 0 ° position and the 0 ° position is 97.66 ° (C Point), the angle with the 0 ° position is 149.18 ° (point D), the angle with the 0 ° position is 206.75 ° (point E), and the angle with the 0 ° position is 236.34 ° (point F) It is obtained by sequentially connecting the smooth transition curves, that is, the contour line (C1 line) from the point A to the point F of the inner surface 131 of the side wall 13 connects the points A, B, C, and Obtained at points D, E, and F.
  • the curve of the smooth transition may be a fitting curve, that is, the contour line (C1 line) from the point A to the point F of the inner surface 131 of the side wall 13 may be composed of points A, B, C, D, and E. Point and F are obtained by curve fitting.
  • the distance between the inner surface 131 of the side wall 13 and the coordinate origin O is 18.38mm ⁇ 5mm, that is, the length of the line segment OG is 18.38mm ⁇ 5mm.
  • the line connecting the contour line of the inner surface 1331 of the side wall 13 between the 0 ° position and the 0 ° position with an angle of -2.48 ° is a straight line (C2).
  • the length of the line segment OG can be 13.38mm, 14.38mm, 15.38mm, 16.38mm, 17.38mm, 18.38mm, 19.38mm, 20.38mm, 22.38mm, 23.38mm.
  • the length of the line segment OG is greater than the length of the line segment OA.
  • the length of the line segment OA when the length of the line segment OA is 6.97 mm, the length of the line segment OG can be 13.38 mm; when the length of the line segment OA is 11.97 mm, the length of the line segment OG can be 18.38 mm.
  • Point G is located on the air vent 132.
  • the distance between the inner surface 131 of the side wall 13 and the coordinate origin O is 21.69 mm ⁇ 5 mm, that is, the length of the line segment OH is 21.69 mm ⁇ 5mm.
  • the line between the contour of the inner surface 131 of the side wall 13 at the angle of 0 ° at 236.34 ° (point F) and the angle of 0 ° at 277.06 ° (point H) is a straight line ( C3).
  • the straight line C3 is tangent to the contour line C1 at point F.
  • the length of the line segment OH can be 16.69mm, 17.69mm, 18.69mm, 19.69mm, 20.69mm, 21.69mm, 22.69mm, 23.69mm, 24.69mm, 25.69mm, 26.69mm.
  • the length of the line segment OH is greater than the length of the line segment OF.
  • the length of the line segment OF is 10.59 mm
  • the length of the line segment OH may be 16.69 mm
  • the length of the line segment OH may be 21.69 mm.
  • the H point is located on the air outlet hole 132, and the H point and the G point are located at opposite ends of the air outlet hole 132.
  • the impeller 20 is rotatably installed in the mounting cavity 101.
  • the impeller 20 includes an impeller shaft 21 and a plurality of blades 22.
  • 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 connection portion 213 and a blade connection portion 214.
  • the motor connecting portion 213 is located at the middle position of the impeller shaft 21 and has a disk shape.
  • the center of the motor connecting portion 213 is provided with a mounting hole 215.
  • the mounting hole 215 is used to install a motor shaft (not shown) of the motor 23.
  • the axis 212 is the axis 212 of the mounting hole 215.
  • the blade connection portion 214 is located at an edge position of the impeller shaft 21 and surrounds the motor connection portion 213.
  • the blade connection portion 214 extends from the edge of the impeller shaft 21 toward the axial direction of the mounting hole 215.
  • the blade connection portion 214 has a cylindrical shape.
  • the outer surface of the blade connection portion 214 away from the motor connection portion 213 is the outer peripheral wall 211 of the impeller shaft 21.
  • the cross section of the outer peripheral wall 211 perpendicular to the axis 212 is circular.
  • the blade connecting portion 214 and the motor connecting portion 213 together form a receiving cavity 201.
  • the receiving cavity 201 is located between the motor connecting portion 213 and the lower case 12.
  • the motor 23 is fixed on the lower case 12 and installed in the receiving cavity 201.
  • the blade connecting portion 214 is further provided with a through hole 217 communicating with the receiving cavity 201, so that the air pressure of the receiving cavity 201 is substantially the same as the air pressure at the air inlet hole 111.
  • a plurality of blades 22 are distributed on the outer peripheral wall 211 at equal intervals.
  • the impeller shaft 21 drives a plurality of blades 22 to make a circular motion around the impeller shaft 21; when the blade 22 makes a circular motion about the impeller shaft 21, any point on the blade 22 also makes a circular motion around the impeller shaft 21,
  • the locus (L) of each point on the blade 22 is circular.
  • the blade 22 has a sheet-like structure.
  • the blade 22 includes a connection portion 225 and a free portion 226 connected to each other.
  • the connection portion 225 includes a connection end remote from the free portion 226.
  • the free portion 226 includes a free end 222 remote from the connection portion 225.
  • the connecting end 221 and the free end 222 are located at opposite ends of the blade 22, and the connection end 221 is connected to the outer peripheral wall 211.
  • the width of the connecting portion 225 gradually increases, and the width of the free portion 226 remains substantially unchanged.
  • the blade 22 includes a windward surface 223 and a leeward surface 224 opposite to each other.
  • the windward surface 223 connects the connecting end 221 and the free end 222.
  • the windward surface 223 is located on a side of the blade 22 near the rotation direction of the impeller 20.
  • a cross section of the windward surface 223 in a direction perpendicular to the axis 212 has an arc shape, and the arc shape may be a circular arc or an elliptical arc.
  • the cross-section of the leeward surface 224 in a direction perpendicular to the axis 212 has an arc shape, and the arc shape may be a circular arc or an elliptical arc.
  • the blade 22 of the embodiment of the present invention has an arc-shaped sheet structure.
  • the windward surface 223 and the leeward surface 224 are both circular arc surfaces, and the center of the circular arc surface of the windward surface 223 coincides with the center of the arc surface of the leeward surface 224. .
  • the radius of the circle where the arc of the leeward surface 224 is 8.2 mm
  • the radius of the windward surface 223 (the radius of the circle where the arc of the windward surface 223 is) is smaller than the radius of the leeward surface 224
  • the radius of the leeward surface 224 (leeward surface 224)
  • the difference between the radius of the circle where the arc is located and the radius of the windward surface 223 is equal to the thickness T of the blade 22.
  • Each blade 22 extends from the outer peripheral wall 211 in a direction away from the impeller shaft 21.
  • An obtuse angle ⁇ is formed between the two tangent lines L2.
  • the included angles ⁇ formed at various points on the blade 22 gradually decrease.
  • the included angles ⁇ formed at various points on the windward side 223 also become obtuse and gradually decrease.
  • the angle ⁇ 1 of the windward surface 223 at the intersection of the connecting end 221 and the outer peripheral wall 211 is 164.5 ° ⁇ 5 °
  • the angle ⁇ 2 of the windward surface 223 at the end of the free end 222 is 102.7 ° ⁇ 5 °.
  • ⁇ 1 can be 159.5 °, 160.5 °, 161.5 °, 162.5 °, 163.5 °, 164.5 °, 165.5 °, 166.5 °, 167.5 °, 168.5 °, 169.5 °.
  • ⁇ 2 can be 97.7 °, 98.7 °, 99.7 °, 100.7 °, 101.7 °, 102.7 °, 103.7 °, 104.7 °, 105.7 °, 106.7 °, 107.7 °.
  • the angle ⁇ between the connecting end 221 and the free end 222 on the windward surface 223 is larger than ⁇ 2 and smaller than ⁇ 1, and the closer to the connecting end 221, the closer the angle ⁇ formed by the points of the windward surface 223 is to ⁇ 2.
  • the impeller 20 includes an impeller inner diameter d1 and an impeller outer diameter d2, wherein the impeller inner diameter d1 is a diameter of the outer peripheral wall 211 and the impeller outer diameter d2 is a diameter of a contour line of the free end 222 circular motion.
  • the inner diameter d1 of the impeller is 14.5mm ⁇ 3mm, and the inner diameter d1 of the impeller may be 11.5mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, 14.5mmz, 15mm, 15.5mm, 16mm, 16.5mm, 17mm, 17.5mm.
  • the impeller outer diameter d2 is 22mm ⁇ 5mm, and the impeller outer diameter d2 may be 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm.
  • the inner diameter d1 of the impeller is smaller than the diameter of the air inlet hole 111, and the outer diameter d2 of the impeller is larger than the diameter of the air inlet hole 111.
  • the inner diameter d1 of the impeller can be 14.5mm, and the outer diameter d2 of the impeller can be 22mm; when the diameter of the air inlet 111 is 14mm, the inner diameter d1 of the impeller can be 11.5mm, The diameter d2 may be 17 mm.
  • the thickness T of the blade 22 is the distance between the windward surface 223 and the leeward surface 224.
  • the thickness T of the blade 22 is 0.4mm ⁇ 0.06mm.
  • the thickness T of the blade 22 can be 0.34mm, 0.36mm, 0.38mm, 0.40mm, 0.42. mm, 0.44mm, 0.46mm. Since the radius of the circle where the arc of the leeward surface 224 is located is 8.2 mm, the radius of the windward surface 223 (the radius of the circle where the arc of the windward surface 223 is located) is 7.8 mm ⁇ 0.06 mm.
  • the radius of the windward surface 223 is 7.86mm; when the thickness T of the blade 22 is 0.4mm, the radius of the windward surface 223 is 7.8mm; when the thickness T of the blade 22 is 0.46mm, the windward surface 223 The radius is 7.74mm.
  • the number of blades 22 is 23 ⁇ 2, and the number of blades 22 can be 21, 22, 23, 24, and 25.
  • an obtuse angle is formed between a first tangent line of an arbitrary point of the blade 22 in the extending direction of the blade 22 and a second tangent line of the point on the circumference in the rotating direction of the blade 22.
  • the included angle, and in the direction away from the impeller shaft 21, the included angle formed at each point on the blade 22 gradually decreases, so that the centrifugal fan 100 of the present invention produces the same Large air volume and high heat dissipation efficiency.
  • contour shape of the inner surface 131 of the side wall 13 of this embodiment combined with the shape of the blade 22 of this embodiment can make the amount of air generated by the centrifugal fan 100 large and the heat radiation efficiency high.
  • a receiving cavity 201 is provided on the blade shaft 21.
  • the motor 23 can be installed in the receiving cavity 201, and on the other hand, the weight of the impeller shaft 21 can be reduced.
  • the rotation direction of the impeller 20 is positive.
  • the distance between the inner surface 131 of the side wall 13 and the coordinate origin (point O) is 12.7 mm ⁇ 5 mm, that is, the length of the line segment OI is 12.7mm ⁇ 5mm.
  • the distance between the inner surface 131 of the side wall 13 and the coordinate origin (point O) is 13.72mm ⁇ 5mm, that is, the length of the line segment OJ is 13.72mm ⁇ 5mm.
  • the distance between the inner surface 131 of the side wall 13 and the coordinate origin (point O) is 14.64mm ⁇ 5mm, that is, the length of the line segment OK is 14.64mm ⁇ 5mm.
  • the length of the line segment OI can be 7.7mm, 8.7mm, 9.7mm, 10.7mm, 11.7mm, 12.7mm, 13.7mm, 14.7mm, 15.7mm, 16.7mm, 17.7mm.
  • the length of the line segment OJ can be 8.72mm, 9.72mm, 10.72mm, 11.72mm, 12.72mm, 13.72mm, 14.72mm, 15.72mm, 16.72mm, 17.72mm, 18.72mm.
  • the length of the line segment OK can be 9.64mm, 10.64mm, 11.64mm, 12.64mm, 13.64mm, 14.64mm, 15.64mm, 16.64mm, 17.64mm, 18.64mm, 19.64mm.
  • the relationship between the lengths of the line segments OA, line OB, line OI, line OC, line OJ, line OD, line OK, line OE, and line OF shall satisfy the following relationship: the length of line OA is smaller than line OB, the line OB is smaller than line OI, and the line OI is smaller than line OC , Line segment OC is less than line segment OI, line segment OI is less than line segment OD, line segment OD is less than line segment OK, line segment OK line segment OE, line segment OE is less than line segment OF.
  • the length of the line segment OA when the length of the line segment OA is 6.97mm, the length of the line segments OB, OI, OC, OJ, OD, OK, OE, and OF can be 7.11mm, 7.7mm, 8.31mm, 8.72mm, 9.17mm, 9.64mm, respectively. , 10.11mm and 10.59mm; when the length of the line segment OA is 11.97mm, the length of the line segments OB, OI, OC, OJ, OD, OK, OE and OF can be 12.11mm, 12.7mm, 13.31mm, 13.72mm, 14.17mm, 14.64mm, 15.11mm, and 15.59mm.
  • the 0 ° position (point A) on the contour of the inner surface 131 of the side wall 13 is 22.68 ° (point B) and the 0 ° position is 57.92 ° (I Point), the angle with the 0 ° position is 97.66 ° (point C), the angle with the 0 ° position is 123.99 ° (point J), and the angle with the 0 ° position is 149.18 ° (point D)
  • the angle between 0 ° and 178.64 ° (point K), the angle between 0 ° and 206.75 ° (point E) and the angle between 0 ° and 236.34 ° (point F) are rounded
  • the transition curves are sequentially connected, that is, the contour line (C1 line) from the point A to the point F of the inner surface 131 of the side wall 13 is connected to points A, B, I, and C in a smooth transition.
  • the curve of the smooth transition may be a fitting curve, that is, the contour line (C1 line) from the point A to the point F of the inner surface 131 of the side wall 13 may be composed of points A, B, I, C, J Points, D, K, E, and F are obtained by curve fitting.
  • the direction of rotation toward the impeller 20 is positive.
  • the distance between the inner surface 131 of the side wall 13 and the coordinate origin (point O) is 11.63 mm ⁇ 5 mm, that is, the length of the line segment OL is 11.63mm ⁇ 5mm.
  • the distance between the inner surface 131 of the side wall 13 and the coordinate origin (point O) is 12.52mm ⁇ 5mm, that is, the length of the line segment OM It is 12.52mm ⁇ 5mm.
  • the length of the line segment OL can be 6.63mm, 7.63mm, 8.63mm, 9.63mm, 10.63mm, 11.63mm, 12.63mm, 13.63mm, 14.63mm, 15.63mm, 16.63mm.
  • the length of the line segment OM can be 7.52mm, 8.52mm, 9.52mm, 10.52mm, 11.52mm, 12.52mm, 13.52mm, 14.52mm, 15.52mm, 16.52mm, 17.52mm.
  • the length relationship between the line segment OA, the line segment OL, the line segment OB, the line segment OM, and the line segment OG must satisfy: the line segment OL is smaller than the line segment OA, the line segment OA is smaller than the line segment OB, the line segment OB is smaller than the line segment OM, and the line segment OM is smaller than the line segment OG.
  • the length of the line segment OA when the length of the line segment OA is 6.97mm, the length of the line segments OB, OL, OM, and OG can be 7.11mm, 6.63mm, 7.52mm, and 13.38mm, respectively; when the length of the line segment OA is 11.97mm, the line segment OB, The length of OL, OM, and OG can be 12.11mm, 11.63mm, 12.52mm, and 18.38mm, respectively.
  • the contour line C1 of the inner surface 131 of the side wall 13 includes contour lines C11 and C12.
  • the included angle on the contour of the inner surface 131 of the side wall 13 with the 0 ° position is 3.22 ° (point L)
  • the included angle with the 0 ° position is 22.68 ° (point B)
  • the 0 ° position The angle between the angle is 97.66 ° (point C)
  • the angle with the 0 ° position is 149.18 ° (point D)
  • the angle with the 0 ° position is 206.75 ° (point E)
  • the angle at 236.34 ° (point F) is sequentially connected by the smooth transition curve, that is, the contour line (C11 line) from the point L to the point F of the inner surface 131 of the side wall 13 is sequentially connected by the smooth transition curve L points, B points, C points, D points, E points, and F points.
  • the curve of the smooth transition may be a fitting curve, that is, the contour line (C1 line) from the point L to the point F of the inner surface 131 of the side wall 13 may consist of points L, B, C, D, and E. Point and F are obtained by curve fitting.
  • the contour line (C12) between the contour line of the inner surface 131 of the side wall 13 and the 0 ° position is 3.22 ° (point L) and the 0 ° position (point A) is an arc curve.
  • the contour line C12 and the contour line C11 are tangent to the L point.
  • a contour line C2 of the inner surface 131 of the side wall 13 includes contour lines C21 and C22. Among them, the contour line (C21) between the 0 ° position (point A) on the contour line of the inner surface 131 of the side wall 13 and the 0 ° position at -1.46 ° (point M) is an arc curve.
  • the contour line C21 and the contour line C12 are arc curves connecting two segments on the same circumference, that is, the angle between the contour line and the 0 ° position on the contour line of the inner surface 131 of the side wall 13 is 3.22 ° (L Point), the position at 0 ° (point A), and the angle between the position at 0 ° and -1.46 ° (point M) are obtained by successively connecting the arc-shaped curves.
  • the contour line of the tongue 102 is formed by the arc LAM, and the point A is the midpoint of the arc LAM, that is, the arc length of the contour line C12 is equal to the arc length of the contour line C21.
  • the contour line (C22) of the contour line of the inner surface 131 of the side wall 13 between the angle of 0 ° with the position of -1.46 ° and the angle of the 0 ° with the position of -2.48 ° is a straight line.
  • the direction of rotation toward the impeller 20 is positive.
  • the distance between the inner surface 131 of the side wall 13 and the coordinate origin (point O) is 11.63 mm ⁇ 5 mm, that is, the length of the line segment OL is 11.63mm ⁇ 5mm.
  • the angle between the 0 ° position and 3.22 ° (point L) is the closest point from the coordinate origin O to the inner surface 131 of the side wall 13.
  • the distance between the coordinate origin O and the inner surface 131 of the side wall 13 gradually increases in the rotation direction of the impeller 20.
  • the angle from the 0 ° position is 3.22 ° (point L), and the angle from the 0 ° position to 22.68 ° (point B) and the angle from the 0 ° position to 97.66 ° ( Point C), the angle with the 0 ° position is 149.18 ° (point D), the angle with the 0 ° position is 206.75 ° (point E), and the angle with the 0 ° position is 236.34 ° (point F ),
  • the distance between the coordinate origin O and the inner surface 131 of the side wall 13 gradually increases.
  • the relationship between the length of line segment OL, line segment OB, line segment OC, line segment OD, line segment OE, and line segment OF should satisfy: the line segment OL is smaller than the line segment OB, the line segment OB is smaller than the line segment OC, the line segment OC is smaller than the line segment OD, and the line segment OD is smaller than the line segment OE, and the line segment OE is smaller than the line OF.
  • the length of the line segments OB, OC, OD, OE, and OF can be 7.11mm, 8.31mm, 9.17mm, 10.11mm, and 10.59mm; when the length of the line segment OL is 11.63mm At this time, the lengths of the line segments OB, OC, OD, OE, and OF can be 12.11mm, 13.31mm, 14.17mm, 15.11mm, and 15.59mm, respectively.
  • the direction of rotation toward the impeller 20 is positive.
  • the distance between the inner surface 131 of the side wall 13 and the coordinate origin (point O) is 11.63 mm ⁇ 5 mm, that is, the length of the line segment OL is 11.63mm ⁇ 5mm.
  • the angle between the 0 ° position and 3.22 ° (point L) is the closest point from the coordinate origin O to the inner surface 131 of the side wall 13. From an angle of 3.22 ° with respect to the 0 ° position (point L), the distance between the coordinate origin O and the inner surface 131 of the side wall 13 gradually increases in a direction opposite to the rotation direction of the impeller 20.
  • the angle from the 0 ° position to 3.22 ° (point L) passes through the 0 ° position (point A) and the angle to the 0 ° position is -1.46 ° (point M) and 0.
  • the angle between the ° positions is -2.48 ° (point G), and the distance between the coordinate origin O and the inner surface 131 of the side wall 13 gradually increases.
  • the line segment OL is less than the line segment OA
  • the line segment OA is less than the line segment OM
  • the line segment OM is less than the line segment OG.
  • the length of the line segment OL is 6.63mm
  • the length of the line segments OA, OM, and OG can be 6.97mm, 7.52mm, and 13.38mm, respectively
  • the length of the line segment OL is 11.63mm
  • the length of the line segment OA, OM, and OG It can be 11.97mm, 12.52mm, and 18.38mm, respectively.
  • an electronic device 200 includes a main body 30 and a centrifugal fan 100 according to any one of the above embodiments.
  • the centrifugal fan 100 is mounted on the body 30 and is used 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.
  • an obtuse angle is formed between a first tangent line of an arbitrary point of the blade 22 toward the extension direction of the blade 22 and a second tangent line of the point on the circumference toward the rotation direction of the blade 22.
  • the included angle, and in the direction away from the impeller shaft 21, the included angle formed at each point on the blade 22 gradually decreases, so that the centrifugal fan 100 of the present invention produces the same power as the existing centrifugal fan at the same power. Large air volume and high heat dissipation efficiency.
  • first and second are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as “first” and “second” may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "a plurality" is at least two, for example, two, three, etc., unless it is specifically and specifically defined otherwise.

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Abstract

一种电子设备（200）及其离心风扇（100），离心风扇（100）包括蜗壳（10）、安装在蜗壳（10）上的叶轮（20）。叶轮（20）包括叶轮轴（21）及多个叶片（22），叶轮轴（21）带动多个叶片（22）转动以使叶片（22）上任意点围绕叶轮轴（21）做圆周运动，多个叶片（22）相互间隔地设置在叶轮轴（21）的外周壁（211）上，叶片（22）自外周壁（211）朝远离叶轮轴（21）的方向延伸，叶片（22）的任意点的朝叶片（22）的延伸方向的第一切线（L1）与该点在圆周上的朝叶片的转动方向的第二切线（L2）之间形成呈钝角的夹角（α），沿远离叶轮轴（21）的方向上，叶片（22）上各点处形成的夹角（α）逐渐减小；叶片（22）包括相背的连接端（221）及自由端（222），叶片（22）包括迎风面（223），迎风面（223）在连接端（221）与外周壁（211）相交处的夹角（α1）为164.5°±5°，迎风面（223）在自由端（222）的终点处的夹角（α2）为102.7°±5°。该离心风扇（100）产生的风量较大、散热效率较高。

Description

离心风扇及电子设备 技术领域
本发明涉及风扇领域，特别涉及一种离心风扇及电子设备。
背景技术
现有的电子设备(例如，无人飞行器、遥控器、无人车、笔记本电脑等)中，一般通过小型离心风扇给移动设备散热，然而现有技术中的小型离心风扇的功耗大、风量小、散热效率低，不利于离心风扇给电子设备散热。
发明内容
本发明的实施例提供一种离心风扇及电子设备。
本发明实施方式的离心风扇包括蜗壳和设置在所述蜗壳内的叶轮，所述叶轮包括叶轮轴及多个叶片，所述叶轮轴带动多个所述叶片转动以使所述叶片上任意点围绕所述叶轮轴做圆周运动，所述叶轮轴包括外周壁，多个所述叶片相互间隔地设置在所述外周壁上，所述叶片自所述外周壁朝远离所述叶轮轴的方向延伸，所述叶片的任意点的朝所述叶片的延伸方向的第一切线与该点在所述圆周上的朝所述叶片的转动方向的第二切线之间形成呈钝角的夹角，沿远离所述叶轮轴的方向上，所述叶片上各点处形成的所述夹角逐渐减小；所述叶片包括相背的连接端及自由端，所述连接端连接在所述外周壁上，所述叶片包括迎风面，所述迎风面为弧面，所述迎风面在所述连接端与所述外周壁相交处的所述夹角为164.5°±5°，所述迎风面在所述自由端的终点处的所述夹角为102.7°±5°。
本发明实施方式的电子设备包括本体及上述实施方式所述的离心风扇，所述离心风扇设置在所述本体上并用于给所述本体扇热。
本发明实施方式的电子设备及离心风扇中，叶片的任意点的朝叶片的延伸方向的第一切线与该点在圆周上的朝叶片的转动方向的第二切线之间形成呈钝角的夹角，并且沿远离叶轮轴的方向上，叶片上各点处形成的夹角逐渐减小，从而相对于现有的离心风扇，在相同的功率下，本发明的离心风扇产生的风量较大、散热效率较高。
本发明的实施方式的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本发明的实施方式的实践了解到。
附图说明
本发明的上述和/或附加的方面和优点从结合下面附图对实施方式的描述中将变得明 显和容易理解，其中：
图1是本发明某些实施方式的离心风扇的立体结构示意图。
图2是本发明某些实施方式的离心风扇的平面示意图。
图3及图4是本发明某些实施方式的离心风扇中蜗壳的平面示意图。
图5是图4的蜗壳沿V-V线的剖视图。
图6是本发明某些实施方式的离心风扇中叶轮的平面示意图。
图7及图8是图6中的叶轮沿VII-VII线的剖视图。
图9是本发明某些实施方式的离心风扇中叶轮的平面示意图。
图10是图9的叶轮沿X-X线的剖视图。
图11是本发明某些实施方式的电子设备的平面示意图。
具体实施方式
下面详细描述本发明的实施方式，所述实施方式的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施方式是示例性的，仅用于解释本发明，而不能理解为对本发明的限制。
在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”、“顺时针”、“逆时针”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个所述特征。在本发明的描述中，“多个”的含义是两个或两个以上，除非另有明确具体的限定。
在本发明的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接或可以相互通讯；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
在本发明中，除非另有明确的规定和限定，第一特征在第二特征之“上”或之“下”可以包括第一和第二特征直接接触，也可以包括第一和第二特征不是直接接触而是通过它们之间的另外的特征接触。而且，第一特征在第二特征“之上”、“上方”和“上面”包括 第一特征在第二特征正上方和斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”包括第一特征在第二特征正下方和斜下方，或仅仅表示第一特征水平高度小于第二特征。
下文的公开提供了许多不同的实施方式或例子用来实现本发明的不同结构。为了简化本发明的公开，下文中对特定例子的部件和设置进行描述。当然，它们仅仅为示例，并且目的不在于限制本发明。此外，本发明可以在不同例子中重复参考数字和/或参考字母，这种重复是为了简化和清楚的目的，其本身不指示所讨论各种实施方式和/或设置之间的关系。此外，本发明提供了的各种特定的工艺和材料的例子，但是本领域普通技术人员可以意识到其他工艺的应用和/或其他材料的使用。
请参阅图1及图7，本发明实施方式的离心风扇100包括蜗壳10及设置在蜗壳10内的叶轮20。叶轮20包括叶轮轴21及多个叶片22，叶轮轴21带动多个叶片22转动以使叶片22上任意点围绕叶轮轴21做圆周运动，叶轮轴21包括外周壁211，多个叶片22相互间隔地设置在外周壁211上，叶片22自外周壁211朝远离叶轮轴21的方向延伸，叶片22的任意点的朝叶片22的延伸方向的第一切线L1与该点在圆周上的朝叶片22的转动方向的第二切线L2之间形成呈钝角的夹角α，沿远离叶轮轴21的方向上，叶片22上各点处形成的夹角逐渐减小。叶片22包括相背的连接端221及自由端222，连接端221连接在外周壁211上，叶片22包括迎风面223，迎风面223为弧面，迎风面223在连接端221与外周壁211相交处的夹角α1为164.5°±5°，迎风面223在自由端222的终点处的夹角α2为102.7°±5°。
具体地，多个叶片22等间隔设置在外周壁211上。当叶轮轴21转动时，叶轮轴21带动多个叶片22绕叶轮轴21做圆周运动；当叶片22绕叶轮轴21做圆周运动时，叶片22上的任意一点也围绕叶轮轴21做圆周运动，叶片22上的每个点的运动轨迹(L)都为圆形。迎风面223上位于连接端221与自由端222之间的夹角α大于α2并小于α1，且越靠近连接端221，迎风面223的点形成夹角α越接近α2。夹角α大于102.7°±5°并且小于164.5°±5°。叶片22的任意点的第二切线L2的方向也为该点的瞬时速度方向。例如，第一切线L1的方向如图7中的L1的箭头的方向，第二切线L2的方向如图7中的L2的箭头的方向。
本发明实施方式的离心风扇100中，叶片22的任意点的朝叶片22的延伸方向的第一切线L1与该点在圆周上的朝叶片22的转动方向的第二切线L2之间形成呈钝角的夹角α，并且沿远离叶轮轴21的方向上，叶片22上各点处形成的夹角逐渐减小，从而相对于现有的离心风扇，在相同的功率下，本发明的离心风扇100产生的风量较大、散热效率较高。
请参阅图1及图2，本发明实施方式的离心风扇100包括蜗壳10及设置在蜗壳10内的叶轮20。
请结合图3，蜗壳10包括上壳11、下壳12及侧壁13。
上壳11和下壳12位于蜗壳10的相背两端，侧壁13设置在上壳11和下壳12之间。具体地，侧壁13的一端连接在上壳11的边缘位置上，侧壁13的另一端连接在下壳12的边缘位置上，上壳11、下壳12和侧壁13共同围成安装腔101。上壳11开设有与安装腔101连通的进气孔111，进气孔111呈圆形。侧壁13的一端开设与安装腔101连通的出气孔132。本实施方式中，上壳11与侧壁13为一体成型结构。蜗壳10上开设有贯穿上壳11、侧壁13和下壳12的多个安装孔14，多个安装孔14间隔设置并用于固定蜗壳10。本实施方式中，进气孔111的直径为19mm±5mm，例如，进气孔111的直径可以为14mm、15mm、16mm、17mm、18mm、19mm、20mm、21mm、22mm、23mm、24mm。安装孔14的数量为三个，三个安装孔14环绕安装腔101设置。在其他实施方式中，上壳11与侧壁13为分体成型结构。
请结合图4及图5，侧壁13向安装腔101一侧凸出形成有舌部102，以进气孔111的中心为坐标原点O，以坐标原点O到舌部102的中点为0°位置，朝叶轮20的转动方向为正向。
在0°位置处(A点)，侧壁13的内表面131与坐标原点O之间的距离为11.97mm±5mm，也即是，线段OA的长度为11.97mm±5mm。在与0°位置的夹角为22.68°处(B点)，侧壁13的内表面131与坐标原点O之间的距离为12.11mm±5mm，也即是，线段OB的长度为12.11mm±5mm。在与0°位置的夹角为97.66°处(C点)，侧壁13的内表面131与坐标原点O之间的距离为13.31mm±5mm，也即是，线段OC的长度为13.31mm±5mm。在与0°位置的夹角为149.18°处(D点)，侧壁13的内表面131与坐标原点O之间的距离为14.17mm±5mm，也即是，线段OD的长度为14.17mm±5mm。在与0°位置的夹角为206.75°处(E点)，侧壁13的内表面131与坐标原点O之间的距离为15.11mm±5mm，也即是，线段OE的长度为15.11mm±5mm。在与0°位置的夹角为236.34°处(F点)，侧壁13的内表面131与坐标原点O之间的距离为15.59mm±5mm，也即是，线段OF的长度为15.59mm±5mm。
其中，线段OA的长度可以为6.97mm、7.97mm、8.97mm、9.97mm、10.97mm、11.97mm、12.97mm、13.97mm、14.97mm、15.97mm、16.97mm。线段OB的长度可以为7.11mm、8.11mm、9.11mm、10.11mm、11.11mm、12.11mm、13.11mm、14.11mm、15.11mm、16.11mm、17.11mm。线段OC的长度可以为8.31mm、9.31mm、10.31mm、11.31mm、12.31mm、13.31mm、14.31mm、15.31mm、16.31mm、17.31mm、18.31mm。线段OD的长度可以为9.17mm、10.17mm、11.17mm、12.17mm、13.17mm、14.17mm、15.17mm、16.17mm、17.17mm、18.17mm、19.17mm。线段OE的长度可以为10.11mm、11.11mm、12.11mm、13.11mm、14.11mm、15.11mm、 16.11mm、17.11mm、18.11mm、19.11mm、20.11mm。线段OF的长度可以为10.59mm、11.59mm、12.59mm、13.59mm、14.59mm、15.59mm、16.59mm、17.59mm、18.59mm、19.59mm、20.59mm。线段OA、线段OB、线段OC、线段OD、线段OE及线段OF的长度大小关系要满足：线段OA小于线段OB，线段OB小于线段OC，线段OC小于线段OD，线段OD小于线段OE，并且线段OE小于线段OF。例如，当线段OA的长度为6.97mm时，线段OB、OC、OD、OE和OF的长度可以分别为7.11mm、8.31mm、9.17mm、10.11mm和10.59mm；当线段OA的长度为11.97mm时，线段OB、OC、OD、OE和OF的长度可以分别为12.11mm、13.31mm、14.17mm、15.11mm和15.59mm。
侧壁13的内表面131的轮廓线上的0°位置处(A点)、与0°位置的夹角为22.68°处(B点)、与0°位置的夹角为97.66°处(C点)、与0°位置的夹角为149.18°处(D点)、与0°位置的夹角为206.75°处(E点)和与0°位置的夹角为236.34°处(F点)由圆滑过渡的曲线依次连接得到，也即是，侧壁13的内表面131的从A点至F点的轮廓线(C1线)由圆滑过渡的曲线依次连接A点、B点、C点、D点、E点及F点得到。圆滑过渡的曲线可以为拟合曲线，也就是说，侧壁13的内表面131的从A点至F点的轮廓线(C1线)可以由A点、B点、C点、D点、E点及F点经过曲线拟合得到。
在与0°位置的夹角为-2.48°处(G点)，侧壁13的内表面131与坐标原点O之间的距离为18.38mm±5mm，也即是，线段OG的长度为18.38mm±5mm。侧壁13的内表面1331的轮廓线在0°位置和与0°位置的夹角为-2.48°位置之间的连线为直线(C2)。线段OG的长度可以为13.38mm、14.38mm、15.38mm、16.38mm、17.38mm、18.38mm、19.38mm、20.38mm、22.38mm、23.38mm。线段OG的长度大于线段OA的长度，例如，当线段OA的长度为6.97mm时，线段OG的长度可以为13.38mm；当线段OA的长度为11.97mm时，线段OG的长度可以为18.38mm。G点位于出气孔132上。
在与0°位置的夹角为277.06°处(H点)，侧壁13的内表面131与坐标原点O之间的距离为21.69mm±5mm，也即是，线段OH的长度为21.69mm±5mm。侧壁13的内表面131的轮廓线在与0°位置的夹角为236.34°处(F点)和与0°位置的夹角为277.06°处(H点)之间的连线为直线(C3)。直线C3与轮廓线C1在F点处相切。线段OH的长度可以为16.69mm、17.69mm、18.69mm、19.69mm、20.69mm、21.69mm、22.69mm、23.69mm、24.69mm、25.69mm、26.69mm。线段OH的长度大于线段OF的长度，例如，当线段OF的长度为10.59mm时，线段OH的长度可以为16.69mm；当线段OF的长度为15.59mm时，线段OH的长度可以为21.69mm。H点位于出气孔132上，H点与G点位于出气孔132的相背两端。
请结合图6及图7，叶轮20能够转动地安装在安装腔101内。叶轮20包括叶轮轴21 及多个叶片22。
请结合图9及图10，叶轮轴21能够转动地安装在下壳12上，叶轮轴21的轴线212经过进气孔111的圆心112。叶轮轴21包括电机连接部213和叶片连接部214。电机连接部213位于叶轮轴21的中间位置并呈圆盘状，电机连接部213的中心开设有安装孔215，安装孔215用于安装电机23的电机转轴(图未示)，叶轮轴21的轴线212即为安装孔215的轴线212。叶片连接部214位于叶轮轴21的边缘位置并环绕电机连接部213，叶片连接部214自叶轮轴21的边缘朝安装孔215的轴线方向延伸形成。叶片连接部214呈圆筒状，叶片连接部214的远离电机连接部213的外表面为叶轮轴21的外周壁211，外周壁211的垂直于轴线212的横截面呈圆形。叶片连接部214与电机连接部213共同围成有收容腔201，收容腔201位于电机连接部213与下壳12之间，电机23固定在下壳12上并安装在收容腔201内。在其他实施方式中，叶片连接部214上还开设有与收容腔201连通的通孔217，从而使收容腔201的气压与进气孔111处的气压基本相同。
多个叶片22等间隔分布在外周壁211上。当叶轮轴21转动时，叶轮轴21带动多个叶片22绕叶轮轴21做圆周运动；当叶片22绕叶轮轴21做圆周运动时，叶片22上的任意一点也围绕叶轮轴21做圆周运动，叶片22上的每个点的运动轨迹(L)都为圆形。叶片22呈片状结构，叶片22包括相连接的连接部225和自由部226，连接部225包括远离自由部226一端的连接端，自由部226包括远离连接部225一端的自由端222，连接端221及自由端222位于叶片22相背两端，连接端221连接在外周壁211上。沿连接端221至自由端222的方向上，连接部225的宽度(宽度的方向与轴线212平行)逐渐增大，自由部226的宽度基本保持不变。
叶片22包括相背的迎风面223和背风面224，迎风面223连接连接端221和自由端222，迎风面223位于叶片22的靠近叶轮20的转动方向的一侧。迎风面223在垂直于轴线212的方向的截面呈弧形，该弧形可以为圆弧或椭圆弧。背风面224在垂直于轴线212的方向的截面呈弧形，该弧形可以为圆弧或椭圆弧。本发明实施方式的叶片22呈圆弧片状结构，具体地，迎风面223和背风面224均为圆弧面，迎风面223的圆弧面的圆心与背风面224的圆弧面的圆心重合。背风面224的圆弧所在的圆的半径为8.2mm，迎风面223的半径(迎风面223的圆弧所在的圆的半径)小于背风面224的半径，并且背风面224的半径(背风面224的圆弧所在的圆的半径)与迎风面223的半径之差等于叶片22的厚度T。
每个叶片22自外周壁211朝远离叶轮轴21的方向延伸，叶片22的任意点的朝叶片22的延伸方向的第一切线L1与该点在圆周上的朝叶片22的转动方向的第二切线L2之间形成呈钝角的夹角α。沿远离叶轮轴21的方向上(即沿连接端221至自由端222的方向上)，叶片22上各点处形成的夹角α逐渐减小。沿连接端221至自由端222的方向上，迎风面 223上各个点处形成的夹角α也呈钝角并逐渐减小。
请结合图8，具体地，迎风面223在连接端221与外周壁211相交处的夹角α1为164.5°±5°，迎风面223在自由端222的终点处的夹角α2为102.7°±5°。其中，α1可以为159.5°、160.5°、161.5°、162.5°、163.5°、164.5°、165.5°、166.5°、167.5°、168.5°、169.5°。α2可以为97.7°、98.7°、99.7°、100.7°、101.7°、102.7°、103.7°、104.7°、105.7°、106.7°、107.7°。迎风面223上位于连接端221与自由端222之间的夹角α大于α2并小于α1，且越靠近连接端221，迎风面223的点形成夹角α越接近α2。
请结合图7，叶轮20包括叶轮内径d1和叶轮外径d2，其中，叶轮内径d1为外周壁211的直径，叶轮外径d2为自由端222圆周运动的轮廓线的直径。叶轮内径d1为14.5mm±3mm，叶轮内径d1可以为11.5mm、12mm、12.5mm、13mm、13.5mm、14mm、14.5mmz、15mm、15.5mm、16mm、16.5mm、17mm、17.5mm。叶轮外径d2为22mm±5mm，叶轮外径d2可以为17mm、18mm、19mm、20mm、21mm、22mm、23mm、24mm、25mm、26mm、27mm。叶轮内径d1小于进气孔111的直径，叶轮外径d2大于进气孔111的直径。例如，当进气孔111的直径为19mm时，叶轮内径d1可以为14.5mm，叶轮外径d2可以为22mm；当进气孔111的直径为14mm时，叶轮内径d1可以为11.5mm，叶轮外径d2可以为17mm。
叶片22的厚度T为迎风面223与背风面224之间的距离，叶片22的厚度T为0.4mm±0.06mm，叶片22的厚度T可以为0.34mm、0.36mm、0.38mm、0.40mm、0.42mm、0.44mm、0.46mm。由于背风面224的圆弧所在的圆的半径为8.2mm，因此，迎风面223的半径(迎风面223的圆弧所在的圆的半径)为7.8mm±0.06mm，例如，当叶片22的厚度T为0.34mm时，迎风面223的半径为7.86mm；当叶片22的厚度T为0.4mm时，迎风面223的半径为为7.8mm；当叶片22的厚度T为0.46mm时，迎风面223的半径为7.74mm。叶片22的数量为23片±2片，叶片22的数量可以为21片、22片、23片、24片、25片。
本发明实施方式的离心风扇100中，叶片22的任意点的朝叶片22的延伸方向的第一切线与该点在圆周上的朝叶片22的转动方向的第二切线之间形成呈钝角的夹角，并且沿远离叶轮轴21的方向上，叶片22上各点处形成的夹角逐渐减小，从而相对于现有的离心风扇，在相同的功率下，本发明的离心风扇100产生的风量较大、散热效率较高。
进一步地，本实施方式的侧壁13的内表面131的轮廓形状结合本实施方式的叶片22的形状，能够使离心风扇100产生的风量较大、散热效率较高。叶片轴21上开设收容腔201，一方面能够将电机23安装在收容腔201内，另一方面能够减小叶轮轴21的重量。
请参阅图5，在某些实施方式中，以坐标原点O到舌部102的中点为0°位置，朝叶轮20的转动方向为正向。在与0°位置的夹角为57.92°处(I点)，侧壁13的内表面131与 坐标原点(O点)之间的距离为12.7mm±5mm，也即是，线段OI的长度为12.7mm±5mm。在与0°位置的夹角为123.99°处(J点)，侧壁13的内表面131与坐标原点(O点)之间的距离为13.72mm±5mm，也即是，线段OJ的长度为13.72mm±5mm。在与0°位置的夹角为178.64°处(K点)，侧壁13的内表面131与坐标原点(O点)之间的距离为14.64mm±5mm，也即是，线段OK的长度为14.64mm±5mm。
其中，线段OI的长度可以为7.7mm、8.7mm、9.7mm、10.7mm、11.7mm、12.7mm、13.7mm、14.7mm、15.7mm、16.7mm、17.7mm。线段OJ的长度可以为8.72mm、9.72mm、10.72mm、11.72mm、12.72mm、13.72mm、14.72mm、15.72mm、16.72mm、17.72mm、18.72mm。线段OK的长度可以为9.64mm、10.64mm、11.64mm、12.64mm、13.64mm、14.64mm、15.64mm、16.64mm、17.64mm、18.64mm、19.64mm。线段OA、线段OB、线段OI、线段OC、线段OJ、线段OD、线段OK、线段OE及线段OF的长度大小关系要满足：线段OA小于线段OB，线段OB小于线段OI，线段OI小于线段OC，线段OC小于线段OI，线段OI小于线段OD，线段OD小于线段OK，线段OK线段OE，线段OE小于线段OF。例如，当线段OA的长度为6.97mm时，线段OB、OI、OC、OJ、OD、OK、OE和OF的长度可以分别为7.11mm、7.7mm、8.31mm、8.72mm、9.17mm、9.64mm、10.11mm和10.59mm；当线段OA的长度为11.97mm时，线段OB、OI、OC、OJ、OD、OK、OE和OF的长度可以分别为12.11mm、12.7mm、13.31mm、13.72mm、14.17mm、14.64mm、15.11mm和15.59mm。
侧壁13的内表面131的轮廓线上的0°位置处(A点)、与0°位置的夹角为22.68°处(B点)、与0°位置的夹角为57.92°处(I点)、与0°位置的夹角为97.66°处(C点)、与0°位置的夹角为123.99°处(J点)、与0°位置的夹角为149.18°处(D点)、与0°位置的夹角为178.64°处(K点)、与0°位置的夹角为206.75°处(E点)和与0°位置的夹角为236.34°处(F点)由圆滑过渡的曲线依次连接得到，也即是，侧壁13的内表面131的从A点至F点的轮廓线(C1线)由圆滑过渡的曲线依次连接A点、B点、I点、C点、J点、D点、K点、E点及F点得到。圆滑过渡的曲线可以为拟合曲线，也就是说，侧壁13的内表面131的从A点至F点的轮廓线(C1线)可以由A点、B点、I点、C点、J点、D点、K点、E点及F点经过曲线拟合得到。
在某些实施方式中，以坐标原点O到舌部102的中点为0°位置，朝叶轮20的转动方向为正向。在与0°位置的夹角为3.22°处(L点)，侧壁13的内表面131与坐标原点(O点)之间的距离为11.63mm±5mm，也即是，线段OL的长度为11.63mm±5mm。在与0°位置的夹角为-1.46°处(M点)，侧壁13的内表面131与坐标原点(O点)之间的距离为12.52mm±5mm，也即是，线段OM的长度为12.52mm±5mm。
其中，线段OL的长度可以为6.63mm、7.63mm、8.63mm、9.63mm、10.63mm、11.63mm、 12.63mm、13.63mm、14.63mm、15.63mm、16.63mm。线段OM的长度可以为7.52mm、8.52mm、9.52mm、10.52mm、11.52mm、12.52mm、13.52mm、14.52mm、15.52mm、16.52mm、17.52mm。其中，线段OA、线段OL、线段OB、线段OM及线段OG的长度大小关系要满足：线段OL小于线段OA，线段OA小于线段OB，线段OB小于线段OM，线段OM小于线段OG。例如，当线段OA的长度为6.97mm时，线段OB、OL、OM和OG的长度可以分别为7.11mm、6.63mm、7.52mm和13.38mm；当线段OA的长度为11.97mm时，线段OB、OL、OM和OG的长度可以分别为12.11mm、11.63mm、12.52mm和18.38mm。
侧壁13的内表面131的轮廓线C1包括轮廓线C11和C12。其中，侧壁13的内表面131的轮廓线上的与0°位置的夹角为3.22°处(L点)、与0°位置的夹角为22.68°处(B点)、与0°位置的夹角为97.66°处(C点)、与0°位置的夹角为149.18°处(D点)、与0°位置的夹角为206.75°处(E点)和与0°位置的夹角为236.34°处(F点)由圆滑过渡的曲线依次连接得到，也即是，侧壁13的内表面131的从L点至F点的轮廓线(C11线)由圆滑过渡的曲线依次连接L点、B点、C点、D点、E点及F点得到。圆滑过渡的曲线可以为拟合曲线，也就是说，侧壁13的内表面131的从L点至F点的轮廓线(C1线)可以由L点、B点、C点、D点、E点及F点经过曲线拟合得到。侧壁13的内表面131的轮廓线上的与0°位置的夹角为3.22°处(L点)和0°位置处(A点)之间的轮廓线(C12)为圆弧曲线。轮廓线C12与轮廓线C11相切于L点。
侧壁13的内表面131的轮廓线C2包括轮廓线C21和C22。其中，侧壁13的内表面131的轮廓线上的0°位置处(A点)和与0°位置的夹角为-1.46°处(M点)之间的轮廓线(C21)为圆弧曲线。轮廓线C21与轮廓线C12为同一圆周上的两段相连接的圆弧曲线，也即是，侧壁13的内表面131的轮廓线上的与0°位置的夹角为3.22°处(L点)、0°位置处(A点)和与0°位置的夹角为-1.46°处(M点)由圆弧形曲线依次连接得到。舌部102的轮廓线由圆弧LAM形成，A点为圆弧LAM的中点，也即是说，轮廓线C12的弧长与轮廓线C21的弧长相等。侧壁13的内表面131的轮廓线上在与0°位置的夹角为-1.46°处和与0°位置的夹角为-2.48°处之间的轮廓线(C22)为直线。
在某些实施方式中，以坐标原点O到舌部102的中点为0°位置，朝叶轮20的转动方向为正向。在与0°位置的夹角为3.22°处(L点)，侧壁13的内表面131与坐标原点(O点)之间的距离为11.63mm±5mm，也即是，线段OL的长度为11.63mm±5mm。与0°位置的夹角为3.22°处(L点)为坐标原点O到侧壁13的内表面131距离最近的点。自与0°位置的夹角为3.22°处(L点)，朝叶轮20的转动方向上，坐标原点O与侧壁13的内表面131之间的距离逐渐增大。
具体地，自与0°位置的夹角为3.22°处(L点)，依次经过与0°位置的夹角为22.68° 处(B点)、与0°位置的夹角为97.66°处(C点)、与0°位置的夹角为149.18°处(D点)、与0°位置的夹角为206.75°处(E点)和与0°位置的夹角为236.34°处(F点)，坐标原点O与侧壁13的内表面131之间的距离逐渐增大。
线段OL、线段OB、线段OC、线段OD、线段OE及线段OF的长度大小关系要满足：线段OL小于线段OB，线段OB小于线段OC，线段OC小于线段OD，线段OD小于线段OE，并且线段OE小于线段OF。例如，当线段OL的长度为6.63mm时，线段OB、OC、OD、OE和OF的长度可以分别为7.11mm、8.31mm、9.17mm、10.11mm和10.59mm；当线段OL的长度为11.63mm时，线段OB、OC、OD、OE和OF的长度可以分别为12.11mm、13.31mm、14.17mm、15.11mm和15.59mm。
在某些实施方式中，以坐标原点O到舌部102的中点为0°位置，朝叶轮20的转动方向为正向。在与0°位置的夹角为3.22°处(L点)，侧壁13的内表面131与坐标原点(O点)之间的距离为11.63mm±5mm，也即是，线段OL的长度为11.63mm±5mm。与0°位置的夹角为3.22°处(L点)为坐标原点O到侧壁13的内表面131距离最近的点。自与0°位置的夹角为3.22°处(L点)，朝与叶轮20的转动方向相反的方向上，坐标原点O与侧壁13的内表面131之间的距离逐渐增大。
具体地，自与0°位置的夹角为3.22°处(L点)，依次经过0°位置处(A点)和与0°位置的夹角为-1.46°处(M点)和与0°位置的夹角为-2.48°处(G点)，坐标原点O与侧壁13的内表面131之间的距离逐渐增大。
线段OL、线段OA、线段OM及线段OG的长度大小关系要满足：线段OL小于线段OA，线段OA小于线段OM，线段OM小于线段OG。例如，当线段OL的长度为6.63mm时，线段OA、OM和OG的长度可以分别为6.97mm、7.52mm和13.38mm；当线段OL的长度为11.63mm时，线段OA、OM和OG的长度可以分别为11.97mm、12.52mm和18.38mm。
请参阅图11，本发明实施方式的电子设备200包括本体30及上述任意一实施方式的离心风扇100。离心风扇100安装在本体30上并用于给本体30散热。电子设备200包括无人飞行器、无人车、遥控器、笔记本电脑中的任意一种。
本发明实施方式的电子设备200中，叶片22的任意点的朝叶片22的延伸方向的第一切线与该点在圆周上的朝叶片22的转动方向的第二切线之间形成呈钝角的夹角，并且沿远离叶轮轴21的方向上，叶片22上各点处形成的夹角逐渐减小，从而相对于现有的离心风扇，在相同的功率下，本发明的离心风扇100产生的风量较大、散热效率较高。
在本说明书的描述中，参考术语“某些实施方式”、“一个实施方式”、“一些实施方式”、“示意性实施方式”、“示例”、“具体示例”、或“一些示例”等的描述意指结合所述实施方式或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施方式或示例 中。在本说明书中，对上述术语的示意性表述不一定指的是相同的实施方式或示例。而且，描述的具体特征、结构、材料或者特点可以在任何的一个或多个实施方式或示例中以合适的方式结合。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个所述特征。在本发明的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。
尽管上面已经示出和描述了本发明的实施方式，可以理解的是，上述实施方式是示例性的，不能理解为对本发明的限制，本领域的普通技术人员在本发明的范围内可以对上述实施方式进行变化、修改、替换和变型，本发明的范围由权利要求及其等同物限定。

Claims (16)

  1. 一种离心风扇，其特征在于，包括：
    蜗壳；和
    设置在所述蜗壳内的叶轮，所述叶轮包括叶轮轴及多个叶片，所述叶轮轴带动多个所述叶片转动以使所述叶片上任意点围绕所述叶轮轴做圆周运动，所述叶轮轴包括外周壁，多个所述叶片相互间隔地设置在所述外周壁上，所述叶片自所述外周壁朝远离所述叶轮轴的方向延伸，所述叶片的任意点的朝所述叶片的延伸方向的第一切线与该点在所述圆周上的朝所述叶片的转动方向的第二切线之间形成呈钝角的夹角，沿远离所述叶轮轴的方向上，所述叶片上各点处形成的所述夹角逐渐减小；所述叶片包括相背的连接端及自由端，所述连接端连接在所述外周壁上，所述叶片包括迎风面，所述迎风面为弧面，所述迎风面在所述连接端与所述外周壁相交处的所述夹角为164.5°±5°，所述迎风面在所述自由端的终点处的所述夹角为102.7°±5°。
  2. 根据权利要求1所述的离心风扇，其特征在于，所述叶片包括与所述迎风面相背的背风面，所述背风面为弧面，所述迎风面的弧面的圆心与所述背风面的弧面的圆心重合。
  3. 根据权利要求2所述的离心风扇，其特征在于，所述迎风面与所述背风面均为圆弧面，所述背风面的圆弧所在的圆的半径为8.2mm。
  4. 根据权利要求1所述的离心风扇，其特征在于，所述蜗壳包括上壳、下壳及侧壁，所述上壳、所述下壳和所述侧壁共同围成安装腔，所述上壳和所述下壳位于所述蜗壳的相背两端，所述侧壁连接所述上壳和所述下壳并环绕所述安装腔，所述上壳开设有与所述安装腔连通的进气孔，所述侧壁的一端开设与所述安装腔连通的出气孔，所述叶轮安装在所述安装腔内，所述叶轮轴的轴线经过所述进气孔的圆心。
  5. 根据权利要求4所述的离心风扇，其特征在于，所述侧壁向所述安装腔一侧凸出形成有舌部，以所述进气孔的中心为坐标原点，以所述坐标原点到所述舌部的中点为0°位置，朝所述叶轮的转动方向为正向；
    在0°位置处，所述侧壁的内表面与所述坐标原点之间的距离为11.97mm±5mm；
    在与0°位置的夹角为22.68°处，所述侧壁的内表面与所述坐标原点之间的距离为12.11mm±5mm；
    在与0°位置的夹角为97.66°处，所述侧壁的内表面与所述坐标原点之间的距离为 13.31mm±5mm；
    在与0°位置的夹角为149.18°处，所述侧壁的内表面与所述坐标原点之间的距离为14.17mm±5mm；
    在与0°位置的夹角为206.75°处，所述侧壁的内表面与所述坐标原点之间的距离为15.11mm±5mm；
    在与0°位置的夹角为236.34°处，所述侧壁的内表面与所述坐标原点之间的距离为15.59mm±5mm。
  6. 根据权利要求5所述的离心风扇，其特征在于，所述侧壁的内表面的轮廓线上的0°位置处、与0°位置的夹角为22.68°处、与0°位置的夹角为97.66°处、与0°位置的夹角为149.18°处、与0°位置的夹角为206.75°处和与0°位置的夹角为236.34°处由圆滑过渡的曲线依次连接得到。
  7. 根据权利要求6所述的离心风扇，其特征在于，
    在与0°位置的夹角为57.92°处，所述侧壁的内表面与所述坐标原点之间的距离为12.7mm±5mm；
    在与0°位置的夹角为123.99°处，所述侧壁的内表面与所述坐标原点之间的距离为13.72mm±5mm；
    在与0°位置的夹角为178.64°处，所述侧壁的内表面与所述坐标原点之间的距离为14.64mm±5mm。
  8. 根据权利要求7所述的离心风扇，其特征在于，所述侧壁的内表面的轮廓线上的0°位置处、与0°位置的夹角为22.68°处、与0°位置的夹角为57.92°处、与0°位置的夹角为97.66°处、与0°位置的夹角为123.99°处、与0°位置的夹角为149.18°处、与0°位置的夹角为178.64°处、与0°位置的夹角为206.75°处和与0°位置的夹角为236.34°处由圆滑过渡的曲线依次连接得到。
  9. 根据权利要求6或8所述的离心风扇，其特征在于，在与0°位置的夹角为-2.48°处，所述侧壁的内表面与所述坐标原点之间的距离为18.38mm±5mm，所述侧壁的内表面的轮廓线在0°位置和与0°位置的夹角为-2.48°位置之间的连线为直线。
  10. 根据权利要求6或8所述的离心风扇，其特征在于，在与0°位置的夹角为277.06° 处，所述侧壁的内表面与所述坐标原点之间的距离为21.69mm±5mm，所述侧壁的内表面的轮廓线在0°位置和与0°位置的夹角为277.06°位置之间的连线为直线。
  11. 根据权利要求5所述的离心风扇，其特征在于，
    在与0°位置的夹角为3.22°处，所述侧壁的内表面与所述坐标原点之间的距离为11.63mm±5mm；
    在与0°位置的夹角为-1.46°处，所述侧壁的内表面与所述坐标原点之间的距离为12.52mm±5mm。
  12. 根据权利要求11所述的离心风扇，其特征在于，所述侧壁的内表面的轮廓线上的与0°位置的夹角为3.22°处、与0°位置的夹角为22.68°处、与0°位置的夹角为97.66°处、与0°位置的夹角为149.18°处、与0°位置的夹角为206.75°处和与0°位置的夹角为236.34°处由圆滑过渡的曲线依次连接得到；所述侧壁的内表面的轮廓线上的与0°位置的夹角为3.22°处、0°位置处和与0°位置的夹角为-1.46°处由圆弧形曲线依次连接得到；所述侧壁的内表面的轮廓线上在与0°位置的夹角为-1.46°处和与0°位置的夹角为-2.48°处之间的轮廓线为直线。
  13. 根据权利要求12所述的离心风扇，其特征在于，自与0°位置的夹角为3.22°处，朝所述叶轮的转动方向上，所述坐标原点与所述侧壁的内表面之间的距离逐渐增大。
  14. 根据权利要求1所述的离心风扇，其特征在于，所述叶轮包括叶轮内径和叶轮外径，所述叶轮内径为14.5mm±3mm，所述叶轮外径为22mm±5mm，所述叶片的厚度为0.4mm±0.06mm，所述叶片的数量为23片±2片。
  15. 根据权利要求1所述的离心风扇，其特征在于，所述叶片包括相连接的连接部和自由部，所述连接部与所述外周壁连接，沿所述连接部至所述自由部的方向上，所述连接部的宽度逐渐增大，所述自由部的宽度保持不变。
  16. 一种电子设备，其特征在于，包括：
    本体；及
    权利要求1-15任意一项所述的离心风扇，所述离心风扇设置在所述本体上并用于给所述本体扇热。
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