WO2020019554A1 - 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
WO2020019554A1
WO2020019554A1 PCT/CN2018/112700 CN2018112700W WO2020019554A1 WO 2020019554 A1 WO2020019554 A1 WO 2020019554A1 CN 2018112700 W CN2018112700 W CN 2018112700W WO 2020019554 A1 WO2020019554 A1 WO 2020019554A1
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WO
WIPO (PCT)
Prior art keywords
angle
side wall
distance
impeller
impeller shaft
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2018/112700
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English (en)
French (fr)
Inventor
李强
罗堃宇
刘翊涵
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SZ DJI Technology Co Ltd
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SZ DJI Technology Co Ltd
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 SZ DJI Technology Co Ltd filed Critical SZ DJI Technology Co Ltd
Priority to CN201880042456.0A priority Critical patent/CN110972488A/zh
Publication of WO2020019554A1 publication Critical patent/WO2020019554A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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

  • Embodiments of the present invention relate to the field of fans, and in particular, to a centrifugal fan and an electronic device.
  • 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. Extending, an angle is formed between a first tangent of an arbitrary point of the blade in the direction of extension of the blade and a second tangent of the point on the circumference in the direction of rotation of the blade.
  • 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, so
  • the blade includes a leeward surface, the leeward surface is an arc surface, the included angle of the leeward surface at the intersection of the connecting end and the outer peripheral wall is 107.7 ° ⁇ 5 °, and the leeward surface is at the free
  • the included angle at the end of the end is 81.4 ° ⁇ 5 .
  • the blade includes a windward surface opposite to the leeward surface, the windward surface is an arc surface, and a circle center of the arc surface of the windward surface coincides with a circle center of the arc surface of the leeward surface.
  • the leeward surface has a radius of 18.5 mm.
  • the volute includes an upper case, a lower case, and a side wall, and the upper case, the lower case, and the side wall collectively surround a mounting cavity, and the upper case and the lower case Located at opposite ends of the volute case, the side wall connecting the upper case and the lower case and surrounding the mounting cavity;
  • the point formed by the projection of the axis of the impeller shaft on the lower shell is the coordinate origin, and the closest point from the coordinate origin to the inner surface of the side wall is the position of 0 °, and is rotated toward the impeller shaft.
  • Direction is positive;
  • the distance between the inner surface of the side wall and the coordinate origin is 26.35mm ⁇ 5mm;
  • the distance between the inner surface of the side wall and the origin of the coordinates is 19.02mm ⁇ 5mm;
  • the distance between the inner surface of the side wall and the origin of the coordinates is 17.65mm ⁇ 5mm;
  • the distance between the inner surface of the side wall and the origin of the coordinates is 17.62 mm ⁇ 5 mm;
  • the distance between the inner surface of the side wall and the origin of the coordinates is 17.11mm ⁇ 5mm
  • the distance between the inner surface of the side wall and the coordinate origin is 17.51 mm ⁇ 5 mm;
  • the distance between the inner surface of the side wall and the origin of the coordinates is 19.78mm ⁇ 5mm;
  • the distance between the inner surface of the side wall and the origin of the coordinates is 22.92 mm ⁇ 5 mm;
  • the distance between the inner surface of the side wall and the coordinate origin is 29.1 mm ⁇ 5 mm.
  • the angle on the contour of the inner surface of the side wall with the 0 ° position is -88.94 °
  • the angle with the 0 ° position is -87.24 °
  • the The angle between -56.08 °, the position with 0 °, the angle with 0 ° is 58.88 °
  • the angle with 0 ° is 113.94 °
  • the angle with 0 ° is 175.37 °
  • the angle with the 0 ° position is 194.11 °, which is obtained by successively connecting the curves of the smooth transition.
  • the distance between the inner surface of the side wall and the coordinate origin is 21.39 mm ⁇ 5 mm at an angle of -88.72 ° from the 0 ° position;
  • the distance between the inner surface of the side wall and the coordinate origin is 17.5 mm ⁇ 5 mm;
  • the distance between the inner surface of the side wall and the coordinate origin is 17.13 mm ⁇ 5 mm;
  • the distance between the inner surface of the side wall and the origin of the coordinates is 18.3 mm ⁇ 5 mm;
  • the distance between the inner surface of the side wall and the coordinate origin is 20.1 mm ⁇ 5 mm.
  • the angle between the 0 ° position and the 0 ° position on the contour of the inner surface of the sidewall is -88.72 ° and the 0 ° position.
  • the angle is -87.24 °
  • the angle to the 0 ° position is -56.08 °
  • the angle to the 0 ° position is -34.48 °
  • the angle to the 0 ° position is 31.44 °
  • the angle with the 0 ° position is 58.88 °
  • the angle with the 0 ° position is 81.4 °
  • the angle with the 0 ° position is 113.94 °
  • the angle with the 0 ° position is 146.99 °
  • the distance between the origin of the coordinates and the inner surface of the side wall gradually increases from the position of 0 ° toward the rotation direction of the impeller shaft; at the position of 0 ° In a direction opposite to the rotation direction of the impeller shaft, the distance between the coordinate origin and the inner surface of the side wall gradually increases.
  • one end of the side wall is provided with an air outlet hole communicating with the installation cavity
  • the upper shell is provided with an air inlet hole communicating with the installation cavity
  • the air inlet hole includes a communication hole
  • the main body portion and the extension portion are round, the axis of the impeller shaft passes through the center of the circle of the main body portion, and the extension portion is provided with an end of the main body portion away from the air outlet.
  • the impeller includes an impeller inner diameter and an impeller outer diameter, the impeller inner diameter is 17.5mm ⁇ 3mm, the impeller outer diameter is 32mm ⁇ 5mm, and the thickness of the blade is 0.3mm ⁇ 0.06mm, The number of the blades is 29 ⁇ 2.
  • the blade includes a connection portion and a free portion connected to each other, the connection portion is connected to the outer peripheral wall, and in a direction from the connection portion to the free portion, The width gradually increases, and the width of the free portion remains unchanged.
  • the impeller further includes a ring-shaped connecting piece, and the connecting piece is arranged around the impeller shaft and connects a plurality of the blades.
  • An electronic device includes a main body and a centrifugal fan according to any one of the foregoing embodiments.
  • 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 the angle formed at each point on the blade gradually decreases in a direction away from the impeller shaft, so that compared with the existing centrifugal fan, at the same power, the centrifugal fan according to the embodiment of the present invention generates less air volume. Large, 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 embodiments of the present invention, the meaning of “plurality” is two or more, unless it is specifically and 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 may be Detachable connection or integral connection; can be mechanical connection, electrical connection or can communicate with each other; can be directly connected, or indirectly connected through an intermediate medium, can be the internal connection of two components or the two components Interaction.
  • installation should be understood in a broad sense unless otherwise specified and limited. For example, they may be fixed connections or may be Detachable connection or integral connection; can be mechanical connection, electrical connection or can communicate with each other; can be directly connected, or indirectly connected through an intermediate medium, can be the internal connection of two components or the two components Interaction.
  • the "first" or “down” of the second feature may include direct contact between the first and second features, or may include the first and second features.
  • the two features are not in direct contact but are contacted through another feature between them.
  • the first feature is "above”, “above”, and “above” the second feature, including the fact 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 angle ⁇ is formed between the second tangent lines L2 in the rotation direction of 22, and the 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 leeward surface 224.
  • the leeward surface 224 is an arc surface.
  • the leeward surface 224 intersects the outer peripheral wall 211 at the connection end 221.
  • the included angle ⁇ 1 is 107.7 ° ⁇ 5 °
  • the included angle ⁇ 2 of the leeward surface 224 at the end of the free end 222 is 81.4 ° ⁇ 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 leeward surface 224 is larger than ⁇ 2 and smaller than ⁇ 1, and the closer to the connecting end 221, the closer the angle ⁇ formed by the points on the leeward surface 224 is to ⁇ 2.
  • the included angle ⁇ on the leeward surface 224 between the connection end 221 and the free end 222 is greater than 81.4 ° and less than 107.7 °.
  • 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 angle ⁇ of the obtuse angle, and the angle formed at each point on the blade 22 in the direction away from the impeller shaft 21 gradually decreases, so that compared with the existing centrifugal fan, at the same power, the embodiment of the present invention
  • the centrifugal fan 100 generates a large amount of air and has 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 shell 11 is provided with an air inlet hole 111 which is in communication with the mounting cavity 101.
  • the air inlet hole 111 includes a main body portion 113 and an expansion portion 114 which are communicated with each other.
  • the main body portion 113 is circular.
  • the extension portion 114 includes a plurality of extension portions 114 which are arranged at intervals and surround the center of the main body portion 113.
  • the diameter of the main body portion 113 is 28 mm ⁇ 5 mm.
  • the diameter of the main body portion 113 may be 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 31 mm, 32 mm, and 33 mm.
  • One end of the side wall 13 is provided with an air outlet 132 communicating with the mounting cavity 101.
  • the plurality of extension portions 114 are disposed on an end of the main body portion 113 remote from the air outlet hole 132.
  • the upper casing 11 and the side wall 13 are an integrally formed structure.
  • a plurality of mounting portions 14 are formed on the side of the side wall 13 away from the mounting cavity 101.
  • the plurality of mounting portions 14 are spaced apart and are used to fix the volute 10. .
  • the number of the mounting portions 14 in this embodiment is two, and the two mounting portions 14 are located on two opposite sides of the air outlet hole 132 and are symmetrically disposed with respect to a side wall where the air outlet hole 132 is located.
  • the upper shell 11 and the side wall 13 are formed as separate structures.
  • the closest point from the coordinate origin O to the inner surface 131 of the side wall 13, along the rotation direction of the impeller 20, the coordinate origin O and the side wall 13 The distance between the inner surfaces 131 gradually increases.
  • the closest point from the coordinate origin O to the inner surface 131 of the side wall 13 is gradually increased in the direction opposite to the rotation direction of the impeller 20, and the distance between the coordinate origin O and the inner surface 131 of the side wall 13 is gradually increased.
  • a point (point A) closest to the coordinate origin O to the inner surface 131 of the side wall 13 is a position of 0 °, and 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 O is 26.35mm ⁇ 5mm, that is, the length of the line segment OB is 26.35mm ⁇ 5mm.
  • the distance between the inner surface 131 of the side wall 13 and the coordinate origin O is 19.02 mm ⁇ 5 mm, that is, the length of the line segment OC is 19.02 mm ⁇ 5mm.
  • the distance between the inner surface 131 of the side wall 13 and the coordinate origin O is 17.65 mm ⁇ 5 mm, that is, the length of the line segment OD is 17.65 mm ⁇ 5mm.
  • the distance between the inner surface 22 surface 131 of the side wall 13 and the coordinate origin O is 17.62 mm ⁇ 5 mm, that is, the length of the line segment OE is 17.62mm ⁇ 5mm.
  • the distance between the inner surface 131 of the side wall 13 and the coordinate origin O is 17.11 mm ⁇ 5 mm, that is, the length of the line segment OA is 17.11 mm ⁇ 5 mm.
  • the distance between the inner surface 131 of the side wall 13 and the coordinate origin O is 17.51 mm ⁇ 5 mm, that is, the length of the line segment OF is 17.51 mm ⁇ 5mm.
  • the distance between the inner surface 131 of the side wall 13 and the coordinate origin O is 19.78mm ⁇ 5mm, that is, the length of the line segment OG is 19.78mm ⁇ 5mm.
  • the distance between the inner surface 131 of the side wall 13 and the coordinate origin O is 22.92 mm ⁇ 5 mm, that is, the length of the line segment OH is 22.92 mm ⁇ 5mm.
  • the distance between the inner surface 131 of the side wall 13 and the coordinate origin O is 29.1mm ⁇ 5mm, that is, the length of the line segment OI is 29.1mm ⁇ 5mm.
  • the length of the line segment OA can be 12.11mm, 13.11mm, 14.11mm, 15.11mm, 16.11mm, 17.11mm, 18.11mm, 19.11mm, 20.11mm, 21.11mm, 22.11mm.
  • the length of the line segment OB can be 21.35mm, 22.35mm, 23.35mm, 24.35mm, 25.35mm, 26.35mm, 27.35mm, 28.35mm, 29.35mm, 30.35mm, 31.35mm.
  • the length of the line segment OC can be 14.02mm, 15.02mm, 16.02mm, 17.02mm, 18.02mm, 19.02mm, 20.02mm, 21.02mm, 22.02mm, 23.02mm, 24.02mm.
  • the length of the line segment OD can be 12.65mm, 13.65mm, 14.65mm, 15.65mm, 16.65mm, 17.65mm, 18.65mm, 19.65mm, 20.65mm, 21.65mm, 22.65mm.
  • the length of the line segment OE can be 12.62mm, 13.62mm, 14.62mm, 15.62mm, 16.62mm, 17.62mm, 18.62mm, 19.62mm, 20.62mm, 21.62mm, 22.62mm.
  • the length of the line OF can be 12.51mm, 13.51mm, 14.51mm, 15.51mm, 16.51mm, 17.51mm, 18.51mm, 19.51mm, 20.51mm, 21.51mm, 22.51mm.
  • the length of the line segment OG can be 14.78mm, 15.78mm, 16.78mm, 17.78mm, 18.78mm, 19.78mm, 20.78mm, 21.78mm, 22.78mm, 23.78mm, 24.78mm.
  • the length of the line segment OH can be 17.92mm, 18.92mm, 19.92mm, 20.92mm, 21.92mm, 22.92mm, 23.92mm, 24.92mm, 25.92mm, 26.92mm, 27.92mm.
  • the length of the line segment OI can be 24.1mm, 25.1mm, 26.1mm, 27.1mm, 28.1mm, 29.1mm, 30.1mm, 31.1mm, 32.1mm, 33.1mm, 34.1mm.
  • the line segment OA is less than the line segment OF
  • the line segment OF is less than the line segment OG
  • the line segment OG is less than the line segment OH
  • the line segment OH is less than the line segment OI
  • the length of the line segment is 12.11mm
  • the length of the line segment OF, the line segment OG, the line segment OH, and the line segment OI can be 12.51mm, 14.78mm, 17.92mm, and 24.1mm respectively
  • the length of the line segment OA is 17.11mm
  • the lengths of the line segments OH and OI can be 17.51mm, 19.78mm, 22.92mm, and 29.1mm, respectively.
  • the relationship between the length of the line segment OA, the line segment OB, the line segment OC, the line segment OD and the line segment OE satisfies: the line segment OA is smaller than the line segment OE, the line segment OE is smaller than the line segment OD, the line segment OD is smaller than the line segment OC, and the line segment OC is smaller than the line segment OB;
  • the length of the line segments OE, OD, OC, and OB can be 12.62mm, 12.65mm, 14.02mm, and 21.35mm, respectively.
  • the length of the line segment OA is 17.11mm
  • the lengths of the line segments OC and OB can be 17.62mm, 17.65mm, 19.02mm, and 26.35mm, respectively.
  • the angle on the contour of the inner surface 131 of the side wall 13 with the 0 ° position is -88.94 ° (point B), the angle with the 0 ° position is -87.24 ° (point C), and the 0 ° position
  • the angle with the 0 ° position is 113.94 ° (point G)
  • the angle with the 0 ° position is 175.37 ° (point H)
  • the angle with the 0 ° position is 194.11 ° (I (Points) are obtained by successively connecting the curves of the smooth transition, that is, the contour line (C1 line) from the point B to the point I of the inner surface 131 of the side wall 13 sequentially connects points B, C, and D by the curves of the
  • the curve of the smooth transition may be a fitting curve, that is, the contour line (C1 line) from the point B to the point I of the inner surface 131 of the side wall 13 may consist of points B, C, D, E, and A. Points, F, G, H, and I are obtained by curve fitting.
  • the contour line of the inner surface 131 of the side wall 13 is at an angle of -88.94 ° (point B) with the 0 ° position, at an angle of -87.24 ° (point C) with the 0 ° position, and at 0 °
  • the included angle between the positions is -74.87 ° (point D).
  • the connection line between the mounting cavity 101 and the tongue 102 of the volute 10 is formed.
  • Points B and I are both located at the air outlet 132, and points B and I are located at opposite ends of the air outlet 132, respectively.
  • the impeller 20 is rotatably installed in the mounting cavity 101.
  • the impeller 20 includes an impeller shaft 21, a plurality of blades 22, and an annular connecting piece 23.
  • the impeller shaft 21 is rotatably mounted on the lower casing 12, and the axis 212 of the impeller shaft 21 passes the center of the main body 113, that is, the projection of the axis 212 of the impeller shaft 21 on the upper casing 11. It coincides with the center of the main body 113.
  • 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. 23
  • 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 24.
  • the impeller shaft 21 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 24 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 leeward surface 224 (the radius of the circle where the arc of the leeward surface 224 is located) is 18.5mm
  • the radius of the windward surface 223 (the radius of the circle where the arc of the windward surface 223 is located) is smaller than the radius of the leeward surface 224
  • the leeward surface The difference between the radius of 224 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 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 leeward surface 224 also become obtuse and gradually decrease.
  • the included angle ⁇ 1 of the leeward surface 224 at the intersection of the connecting end 221 and the outer peripheral wall 211 is 107.7 ° ⁇ 5 °
  • the included angle ⁇ 2 of the leeward surface 224 at the end of the free end 222 is 81.4 ° ⁇ 5 °.
  • ⁇ 1 can be 102.7 °, 103.7 °, 104.7 °, 105.7 °, 106.7 °, 107.7 °, 108.7 °, 109.7 °, 110.7 °, 111.7 °, and 112.7 °.
  • ⁇ 2 can be 76.4 °, 77.4 °, 78.4 °, 79.4 °, 80.4 °, 81.4 °, 82.4 °, 83.4 °, 84.4 °, 85.4 °, 86.4 °.
  • the angle ⁇ between the connecting end 221 and the free end 222 on the leeward surface 224 is larger than ⁇ 2 and smaller than ⁇ 1, and the closer to the connecting end 221, the closer the angle ⁇ formed by the points on the leeward surface 224 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 impeller inner diameter d1 is 17.5mm ⁇ 3mm, and the impeller inner diameter d1 may be 14.5mm, 15mm, 15.5mm, 16mm, 16.5mm, 17mm, 17.5mm, 18mm, 18.5mm, 19mm, 19.5mm, 20mm, 20.5mm.
  • the impeller outer diameter d2 is 32mm ⁇ 5mm, and the impeller outer diameter d2 may be 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 36mm, 37mm.
  • the inner diameter d1 of the impeller is smaller than the diameter of the main body portion 113, and a half of the outer diameter d2 of the impeller is larger than the maximum distance between the extended portion 114 and the center of the main body portion 113.
  • the inner diameter d1 of the impeller may be 14.5 mm
  • the outer diameter d2 of the impeller may be 27 mm
  • the maximum distance between the center of the extension portion 114 and the main body portion 113 is less than 13.5 mm.
  • the inner diameter d1 of the impeller can be 17.5 mm
  • the outer diameter d2 of the impeller can be 32 mm
  • the maximum distance between the center of the extension portion 114 and the main body portion 113 is less than 16 mm.
  • the thickness T of the blade 22 is the distance between the windward surface 223 and the leeward surface 224. In this embodiment, the thickness T of the blade 22 is the difference between the radius of the leeward surface 224 and the radius of the windward surface 223.
  • the thickness T of the blade 22 is 0.3mm ⁇ 0.06mm, and the thickness T of the blade 22 may be 0.24mm, 0.26mm, 0.28mm, 0.3mm, 0.32mm, 0.34mm, 0.36mm. Because the radius of the leeward surface 224 is 18.5mm, the radius of the windward surface 223 is 18.2mm ⁇ 0.06mm.
  • the radius of the windward surface 223 is 18.26mm;
  • the radius of the windward surface 223 is 18.2 mm;
  • the radius of the windward surface 223 is 18.14 mm.
  • the number of the blades 22 is 29 ⁇ 2, and the number of the blades 22 can be 27, 28, 29, 30, and 31.
  • the connecting piece 23 is disposed around the impeller shaft 21, and the connecting piece 23 is connected to a plurality of blades 22 on the impeller 20. Specifically, the connecting piece 23 is disposed on an end of the blade 22 near the upper shell 11, the connecting piece 23 is provided on the free portion 226, and the center of the connecting piece 23 is located on the axis 212 of the impeller shaft 21. In the extending direction of the blade 22, the length of the free portion 226 is greater than or equal to the width of the connecting piece 23.
  • the outer diameter of the connecting piece 23 is equal to the outer diameter d2 of the impeller.
  • the inner diameter of the connecting piece 23 is greater than or equal to the diameter of the main body portion 113. For example, when the diameter of the main body portion 113 is 28 mm, the inner diameter of the connecting piece 23 is greater than or equal to 28 mm.
  • 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 generated air volume is large and the heat dissipation efficiency is high.
  • 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 24 can be installed in the receiving cavity 201, and on the other hand, the weight of the impeller shaft 21 can be reduced.
  • the closest point (point A) from the coordinate origin O to the inner surface 131 of the side wall 13 is a 0 ° position, and 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 21.39 mm ⁇ 5 mm, that is, the length of the line segment OJ It is 21.39mm ⁇ 5mm.
  • the distance between the inner surface 131 of the side wall 13 and the coordinate origin (point O) is 17.5mm ⁇ 5mm, that is, the length of the line segment OK It is 17.5mm ⁇ 5mm.
  • the distance between the inner surface 131 of the side wall 13 and the coordinate origin (point O) is 17.13 mm ⁇ 5 mm, that is, the length of the line segment OL is 17.13mm ⁇ 5mm.
  • the distance between the inner surface 131 of the side wall 13 and the coordinate origin (point O) is 18.3mm ⁇ 5mm, that is, the length of the line segment OM is 18.3mm ⁇ 5mm.
  • the distance between the inner surface 131 of the side wall 13 and the coordinate origin (point O) is 20.1 mm ⁇ 5 mm, that is, the length of the line segment ON is 20.1mm ⁇ 5mm.
  • the length of the line segment OJ can be 16.39mm, 17.39mm, 18.39mm, 19.39mm, 20.39mm, 21.39mm, 22.39mm, 23.39mm, 24.39mm, 25.39mm, 26.39mm.
  • the length of the line segment OK can be 12.5mm, 13.5mm, 14.5mm, 15.5mm, 16.5mm, 17.5mm, 18.5mm, 19.5mm, 20.5mm, 21.5mm, 22.5mm.
  • the length of the line segment OL can be 12.13mm, 13.13mm, 14.13mm, 15.13mm, 16.13mm, 17.13mm, 18.13mm, 19.13mm, 20.13mm, 21.13mm, 22.13mm.
  • the length of the line segment OM can be 13.3mm, 14.3mm, 15.3mm, 16.3mm, 17.3mm, 18.3mm, 19.3mm, 20.3mm, 21.3mm, 22.3mm, 23.3mm.
  • the length of the line segment ON can be 15.1mm, 16.1mm, 17.1mm, 18.1mm, 19.1mm, 20.1mm, 21.1mm, 22.1mm, 23.1mm, 24.1mm, 25.1mm.
  • the relationship between the length of line segments OA, line OL, line OF, line segment OM, line segment OG, line segment ON, line segment OH, and line segment OI must satisfy: the length of line segment OA is smaller than line segment OL, the line segment OL is smaller than line segment OF, the line segment OF is smaller than line segment OM, and line segment OM Less than line segment OG, line segment OG is less than line segment ON, line segment ON is less than line segment OH, line segment OH is less than line segment OI; for example, when the length of line segment OA is 12.11mm, line segment OL, line segment OF, line segment OM, line segment OG, line segment ON, line segment
  • the length of OH and line segment OI can be 12.13mm, 12.51mm, 13.3mm, 14.78mm, 15.1mm, 1792mm, 24.1mm; when the length of line segment OA is 17.11mm, line segment OF, line segment OG, line segment OH, and line segment OI The length can be 17.13mm,
  • the line segment OA is less than the line segment OK
  • the line segment OK is less than the line segment OE
  • the line segment OE is less than the line segment OD
  • the line segment OD is less than the line segment OC.
  • the line segment OC is smaller than the line segment OJ, and the line segment OJ is less than the line segment OB; for example, when the length of the line segment OA is 12.11 mm, the length of the line segment OK, the line segment OE, the line segment OD, the line segment OC, the line segment OJ, and the line segment OB may be 12.5 mm, 12.62, respectively mm, 12.65mm, 14.02mm, 16.39mm, 21.35mm; when the length of line segment OA is 17.11mm, the length of line segment OE, line segment OD, line segment OC, and line segment OB can be 17.5mm, 17.62mm, 17.65mm, 19.02 mm, 21.39mm, 26.35mm.
  • the angle on the contour of the inner surface 131 of the side wall 13 from the 0 ° position is -88.94 ° (point B), the angle from the 0 ° position is -88.72 ° (point J), and the 0 ° position
  • the angle between the position is -34.48 ° (point K), the position at 0 ° (point A), the angle between the position 0 ° is 34.44 ° (point L), and the angle between the position 0 ° and 58.88 ° (Point F), the angle with the 0 ° position is 81.4 ° (point M), the angle with the 0 ° position is 113.94 ° (point G), and the angle with the 0 ° position is 146.99 ° (N Point), the angle with the
  • the curve of the smooth transition may be a fitting curve, that is, the contour line (C1 line) from the point B to the point I of the inner surface 131 of the side wall 13 may consist of points B, J, C, D, and E.
  • Points, K points, A points, L points, F points, M points, G points, N points, H points, and I points are obtained by curve fitting.
  • the contour line of the inner surface 131 of the side wall 13 is at an angle of -88.72 ° (point J) with the position of 0 °, at an angle of -87.24 ° (point C) with the position of 0 °, and at 0 °
  • the included angle between the positions is -74.87 ° (point D).
  • the connection line between the mounting cavity 101 and the tongue 102 of the volute 10 is formed.
  • 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 generated air volume is large and the heat dissipation efficiency is high.
  • 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

一种电子设备及离心风扇，包括蜗壳（10）和设置在蜗壳（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。离心风扇产生的风量较大、散热效率较高。

Description

离心风扇及电子设备 技术领域
本发明实施例涉及风扇领域，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，所述叶片包括背风面，所述背风面为弧面，所述背风面在所述连接端与所述外周壁相交处的所述夹角为107.7°±5°，所述背风面在所述自由端的终点处的所述夹角为81.4°±5°。
在某些实施方式中，所述叶片包括与所述背风面相背的迎风面，所述迎风面为弧面，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。
在某些实施方式中，所述背风面的半径为18.5mm。
在某些实施方式中，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；
以所述叶轮轴的轴线在所述下壳上的投影形成的点为坐标原点，以所述坐标原点到所述侧壁的内表面最近的点为0°位置，朝所述叶轮轴的转动方向为正向；
在与0°位置的夹角为-88.94°处，所述侧壁的内表面与所述坐标原点之间的距离为26.35mm±5mm；
在与0°位置的夹角为-87.24°处，所述侧壁的内表面与所述坐标原点之间的距离为19.02mm±5mm；
在与0°位置的夹角为-74.87°处，所述侧壁的内表面与所述坐标原点之间的距离为17.65mm±5mm；
在与0°位置的夹角为-56.08°处，所述侧壁的内表面与所述坐标原点之间的距离为17.62mm±5mm；
在与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17.11mm±5mm
在与0°位置的夹角为58.88°处，所述侧壁的内表面与所述坐标原点之间的距离为17.51mm±5mm；
在与0°位置的夹角为113.94°处，所述侧壁的内表面与所述坐标原点之间的距离为19.78mm±5mm；
在与0°位置的夹角为175.37°处，所述侧壁的内表面与所述坐标原点之间的距离为22.92mm±5mm；
在与0°位置的夹角为194.11°处，所述侧壁的内表面与所述坐标原点之间的距离为29.1mm±5mm。
在某些实施方式中，所述侧壁的内表面的轮廓线上的与0°位置的夹角为-88.94°处、与0°位置的夹角为-87.24°处、与0°位置的夹角为-56.08°处、与0°位置处、与0°位置的夹角为58.88°处、与0°位置的夹角为113.94°处、与0°位置的夹角为175.37°处和与0°位置的夹角为194.11°处由圆滑过渡的曲线依次连接得到。
在某些实施方式中，在与0°位置的夹角为-88.72°处，所述侧壁的内表面与所述坐标原点之间的距离为21.39mm±5mm；
在与0°位置的夹角为-34.48°处，所述侧壁的内表面与所述坐标原点之间的距离为17.5mm±5mm；
在与0°位置的夹角为31.44°处，所述侧壁的内表面与所述坐标原点之间的距离为17.13mm±5mm；
在与0°位置的夹角为81.4°处，所述侧壁的内表面与所述坐标原点之间的距离为18.3mm±5mm；
在与0°位置的夹角为146.99°处，所述侧壁的内表面与所述坐标原点之间的距离为20.1mm±5mm。
在某些实施方式中，所述侧壁的内表面的轮廓线上的与0°位置的夹角为-88.94°处、与0°位置的夹角为-88.72°处、与0°位置的夹角为-87.24°处、与0°位置的夹角为-56.08° 处、与0°位置的夹角为-34.48°处、与0°位置处、与0°位置的夹角为31.44°处、与0°位置的夹角为58.88°处、与0°位置的夹角为81.4°处、与0°位置的夹角为113.94°处、与0°位置的夹角为146.99°处、与0°位置的夹角为175.37°处和与0°位置的夹角为194.11°处由圆滑过渡的曲线依次连接得到。
在某些实施方式中，自与0°位置处，朝所述叶轮轴的转动方向上，所述坐标原点与所述侧壁的内表面之间的距离逐渐增大；自与0°位置处，朝与所述叶轮轴的转动方向相反的方向上，所述坐标原点与所述侧壁的内表面之间的距离逐渐增大。
在某些实施方式中，所述侧壁的一端开设有与所述安装腔连通的出气孔，所述上壳开设有与所述安装腔连通的进气孔，所述进气孔包括相连通的主体部及扩展部，所述主体部呈圆形，所述叶轮轴的轴线穿过所述主体部的圆心，所述扩展部设置所述主体部的远离所述出气孔的一端。
在某些实施方式中，所述叶轮包括叶轮内径和叶轮外径，所述叶轮内径为17.5mm±3mm，所述叶轮外径为32mm±5mm，所述叶片的厚度为0.3mm±0.06mm，所述叶片的数量为29片±2片。
在某些实施方式中，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。
在某些实施方式中，所述叶轮还包括环状连接片，所述连接片环绕所述叶轮轴设置并连接多个所述叶片。
本发明实施方式的电子设备包括本体及上述任意一项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，本发明实施方式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
本发明实施方式的上述和/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。
在本发明实施方式的描述中，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实施方式和简化描述，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。在本发明实施方式的描述中，“多个”的含义是两个或两个以上，除非另有明确具体的限定。
在本发明实施方式的描述中，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。
在本发明实施方式中，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包括背风面224，背风面224为弧面，背风面224在连接端221与外周壁211相交处的夹角α1为107.7°±5°，背风面224在自由端222的终点处的夹角α2为81.4°±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。背风面224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，背风面224的点形成夹角α越接近α2。在背风面224上并位于连接端221和自由端222之间的夹角α大于81.4°并且小于107.7°。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，本发明实施方式的离心风扇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包括相连通的主体部113及扩展部114，主体部113呈圆形。扩展部114包括多个，多个扩展部114间隔设置并环绕主体部113的中心。本实施方式中，主体部113的直径为28mm±5mm，例如，主体部113的直径可以为23mm、24mm、25mm、26mm、27mm、28mm、29mm、30mm、31mm、32mm、33mm。
侧壁13的一端开设与安装腔101连通的出气孔132。多个扩展部114设置在主体部113的远离出气孔132的一端。本实施方式中，上壳11与侧壁13为一体成型结构，侧壁13的远离安装腔101一侧向外形成有多个安装部14，多个安装部14间隔设置并用于固定蜗壳10。本实施方式的安装部14的数量为两个，两个安装部14位于出气孔132相背的两侧，并关于出气孔132所在侧壁对称设置。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，以主体部113的中心为坐标原点O，自坐标原点O到侧壁13的内表面131最近的点，沿叶轮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。自坐标原点O到侧壁13的内表面131最近的点，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，以坐标原点O到侧壁13的内表面131最近的点(A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-88.94°处(B点)，侧壁13的内表面131与坐标原点O之间的距离为26.35mm±5mm，也即是，线段OB的长度为26.35mm±5mm。在与0°位置的夹角为-87.24°处(C点)，侧壁13的内表面131与坐标原点O之间的距离为19.02mm±5mm，也即是，线段OC的长度为19.02mm±5mm。在与0°位置的夹角为-74.87°处(D点)，侧壁13的内表面131与坐标原点O之间的距离为17.65mm±5mm，也即是，线段OD的长度为17.65mm±5mm。在与0°位置的夹角为-56.08°处(E点)，侧壁13的内表22面131与坐标原点O之间的距离为17.62mm±5mm，也即是，线段OE的长度为17.62mm±5mm。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17.11mm±5mm，也即是，线段OA的长度为17.11mm±5mm。在与0°位置的夹角为58.88°处(F点)，侧壁13的内表面131与坐标原点O之间的距离为17.51mm±5mm，也即是，线段OF的长度为17.51mm±5mm。在与0°位置的夹角为113.94°处(G点)，侧壁13的内表 面131与坐标原点O之间的距离为19.78mm±5mm，也即是，线段OG的长度为19.78mm±5mm。在与0°位置的夹角为175.37°处(H点)，侧壁13的内表面131与坐标原点O之间的距离为22.92mm±5mm，也即是，线段OH的长度为22.92mm±5mm。在与0°位置的夹角为194.11°处(I点)，侧壁13的内表面131与坐标原点O之间的距离为29.1mm±5mm，也即是，线段OI的长度为29.1mm±5mm。
其中，线段OA的长度可以为12.11mm、13.11mm、14.11mm、15.11mm、16.11mm、17.11mm、18.11mm、19.11mm、20.11mm、21.11mm、22.11mm。线段OB的长度可以为21.35mm、22.35mm、23.35mm、24.35mm、25.35mm、26.35mm、27.35mm、28.35mm、29.35mm、30.35mm、31.35mm。线段OC的长度可以为14.02mm、15.02mm、16.02mm、17.02mm、18.02mm、19.02mm、20.02mm、21.02mm、22.02mm、23.02mm、24.02mm。线段OD的长度可以为12.65mm、13.65mm、14.65mm、15.65mm、16.65mm、17.65mm、18.65mm、19.65mm、20.65mm、21.65mm、22.65mm。线段OE的长度可以为12.62mm、13.62mm、14.62mm、15.62mm、16.62mm、17.62mm、18.62mm、19.62mm、20.62mm、21.62mm、22.62mm。线段OF的长度可以为12.51mm、13.51mm、14.51mm、15.51mm、16.51mm、17.51mm、18.51mm、19.51mm、20.51mm、21.51mm、22.51mm。线段OG的长度可以为14.78mm、15.78mm、16.78mm、17.78mm、18.78mm、19.78mm、20.78mm、21.78mm、22.78mm、23.78mm、24.78mm。线段OH的长度可以为17.92mm、18.92mm、19.92mm、20.92mm、21.92mm、22.92mm、23.92mm、24.92mm、25.92mm、26.92mm、27.92mm。线段OI的长度可以为24.1mm、25.1mm、26.1mm、27.1mm、28.1mm、29.1mm、30.1mm、31.1mm、32.1mm、33.1mm、34.1mm。
线段OA、线段OF、线段OG、线段OH及线段OI的长度大小关系要满足：线段OA小于线段OF，线段OF小于线段OG，线段OG小于线段OH，线段OH小于线段OI；例如，当线段OA的长度为12.11mm时，线段OF、线段OG、线段OH及线段OI的长度可以分别为12.51mm、14.78mm、17.92mm、24.1mm；当线段OA的长度为17.11mm时，线段OF、线段OG、线段OH及线段OI的长度可以分别为17.51mm、19.78mm、22.92mm、29.1mm。
线段OA、线段OB、线段OC、线段OD及线段OE的长度大小关系满足：线段OA小于线段OE，线段OE小于线段OD，线段OD小于线段OC，线段OC小于线段OB；例如，当线段OA的长度为12.11mm时，线段OE、线段OD、线段OC及线段OB的长度可以分别为12.62mm、12.65mm、14.02mm、21.35mm；当线段OA的长度为17.11mm时，线段OE、线段OD、线段OC及线段OB的长度可以分别为17.62mm、17.65mm、19.02mm、26.35mm。
侧壁13的内表面131的轮廓线上的与0°位置的夹角为-88.94°处(B点)、与0°位置的夹角为-87.24°处(C点)、与0°位置的夹角为-74.87°处(D点)、与0°位置的夹角为 -56.08°处(E点)、0°位置处(A点)、与0°位置的夹角为58.88°处(F点)、与0°位置的夹角为113.94°处(G点)、与0°位置的夹角为175.37°处(H点)和与0°位置的夹角为194.11°处(I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B点至I点的轮廓线(C1线)由圆滑过渡的曲线依次连接B点、C点、D点、E点、A点、F点、G点、H点和I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B点至I点的轮廓线(C1线)可以由B点、C点、D点、E点、A点、F点、G点、H点和I点经过曲线拟合得到。
其中，侧壁13的内表面131的轮廓线在与0°位置的夹角为-88.94°处(B点)、与0°位置的夹角为-87.24°处(C点)和与0°位置的夹角为-74.87°处(D点)之间的连线朝安装腔101一侧凸出并形成蜗壳10的舌部102。B点和I点均位于出气孔132处，并且B点和I点分别位于出气孔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、多个叶片22及环状连接片23。
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经过主体部113的圆心，也即是，叶轮轴21的轴线212在上壳11上的投影与主体部113的圆心重合。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，23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24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24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的半径(背风面224的圆弧所在的圆的半径)为18.5mm，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，背风面224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，背风面224在连接端221与外周壁211相交处的夹角α1为107.7°±5°，背风面224在自由端222的终点处的夹角α2为81.4°±5°。其中，α1可以为102.7°、103.7°、104.7°、105.7°、106.7°、107.7°、108.7°、109.7°、110.7°、111.7°、112.7°。α2可以为76.4°、77.4°、78.4°、79.4°、80.4°、81.4°、82.4°、83.4°、84.4°、85.4°、86.4°。背风面224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，背风面224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17.5mm±3mm，叶轮内径d1可以为14.5mm、15mm、15.5mm、16mm、16.5mm、17mm、17.5mm、18mm、18.5mm、19mm、19.5mm、20mm、20.5mm。叶轮外径d2为32mm±5mm，叶轮外径d2可以为27mm、28mm、29mm、30mm、31mm、32mm、33mm、34mm、35mm、36mm、37mm。叶轮内径d1小于主体部113的直径，叶轮外径d2的一半大于扩展部114与主体部113的中心之间的最大距离。例如，当主体部113的直径为23mm时，叶轮内径d1可以为14.5mm，叶轮外径d2可以为27mm，扩展部114与主体部113的中心之间的最大距离小于13.5mm；当主体部113的直径为28mm时，叶轮内径d1可以为17.5mm，叶轮外径d2可以为32mm，扩展部114与主体部113的中心之间的最大距离小于16mm。
叶片22的厚度T为迎风面223与背风面224之间的距离，本实施方式中，叶片22的厚度T为背风面224的半径与迎风面223的半径之差。叶片22的厚度T为0.3mm±0.06mm，叶片22的厚度T可以为0.24mm、0.26mm、0.28mm、0.3mm、0.32mm、0.34mm、0.36mm。由于背风面224的半径为18.5mm，因此，迎风面223的半径为18.2mm±0.06mm，例如，当叶片22的厚度T为0.24mm时，迎风面223的半径为18.26mm；当叶片22的厚度T为0.3mm时，迎风面223的半径为18.2mm；当叶片22的厚度T为0.36mm时，迎风面223的半径为18.14mm。叶片22的数量为29片±2片，叶片22的数量可以为27片、28片、29片、30片、31片。
连接片23环绕叶轮轴21设置，并且连接片23与叶轮20上的多个叶片22均连接。具体地，连接片23设置在叶片22的靠近上壳11的一端，连接片23设置在自由部226上，连接片23的圆心位于叶轮轴21的轴线212上。沿叶片22的延伸方向上，自由部226的长度大于或等于连接片23的宽度。连接片23的外径与叶轮外径d2相等。连接片23的内径大于或等于主体部113的直径，例如，当主体部113的直径为28mm时，连接片23的内径大于或等于28mm。
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，本发明实施方式的离心风扇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24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到侧壁13的内表面131最近的点(A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-88.72°处(J点)，侧壁13的内表面131与坐标原点(O点)之间的距离为21.39mm±5mm，也即是，线段OJ的长度为21.39mm±5mm。在与0°位置的夹角为-34.48°处(K点)，侧壁13的内表面131与坐标原点(O点)之间的距离为17.5mm±5mm，也即是，线段OK的长度为17.5mm±5mm。在与0°位置的夹角为31.44°处(L点)，侧壁13的内表面131与坐标原点(O点)之间的距离为17.13mm±5mm，也即是，线段OL的长度为17.13mm±5mm。在与0°位置的夹角为81.4°处(M点)，侧壁13的内表面131与坐标原点(O点)之间的距离为18.3mm±5mm，也即是，线段OM的长度为18.3mm±5mm。在与0°位置的夹角为146.99°处(N点)，侧壁13的内表面131与坐标原点(O点)之间的距离为20.1mm±5mm，也即是，线段ON的 长度为20.1mm±5mm。
其中，线段OJ的长度可以为16.39mm、17.39mm、18.39mm、19.39mm、20.39mm、21.39mm、22.39mm、23.39mm、24.39mm、25.39mm、26.39mm。线段OK的长度可以为12.5mm、13.5mm、14.5mm、15.5mm、16.5mm、17.5mm、18.5mm、19.5mm、20.5mm、21.5mm、22.5mm。线段OL的长度可以为12.13mm、13.13mm、14.13mm、15.13mm、16.13mm、17.13mm、18.13mm、19.13mm、20.13mm、21.13mm、22.13mm。线段OM的长度可以为13.3mm、14.3mm、15.3mm、16.3mm、17.3mm、18.3mm、19.3mm、20.3mm、21.3mm、22.3mm、23.3mm。线段ON的长度可以为15.1mm、16.1mm、17.1mm、18.1mm、19.1mm、20.1mm、21.1mm、22.1mm、23.1mm、24.1mm、25.1mm。
线段OA、线段OL、线段OF、线段OM、线段OG、线段ON、线段OH及线段OI的长度大小关系要满足：线段OA小于线段OL，线段OL小于线段OF，线段OF小于线段OM，线段OM小于线段OG，线段OG小于线段ON，线段ON小于线段OH，线段OH小于线段OI；例如，当线段OA的长度为12.11mm时，线段OL、线段OF、线段OM、线段OG、线段ON、线段OH及线段OI的长度可以分别为12.13mm、12.51mm、13.3mm、14.78mm、15.1mm、1792mm、24.1mm；当线段OA的长度为17.11mm时，线段OF、线段OG、线段OH及线段OI的长度可以分别为17.13mm、17.51mm、18.3mm、19.78mm、20.1mm、22.92mm、29.1mm。线段OA、线段OB、线段OC、线段OD、线段OE、线段OJ及线段OK的长度大小关系满足：线段OA小于线段OK，线段OK小于线段OE，线段OE小于线段OD，线段OD小于线段OC，线段OC小于线段OJ，线段OJ小于线段OB；例如，当线段OA的长度为12.11mm时，线段OK、线段OE、线段OD、线段OC、线段OJ及线段OB的长度可以分别为12.5mm、12.62mm、12.65mm、14.02mm、16.39mm、21.35mm；当线段OA的长度为17.11mm时，线段OE、线段OD、线段OC及线段OB的长度可以分别为17.5mm、17.62mm、17.65mm、19.02mm、21.39mm、26.35mm。
侧壁13的内表面131的轮廓线上的与0°位置的夹角为-88.94°处(B点)、与0°位置的夹角为-88.72°处(J点)、与0°位置的夹角为-87.24°处(C点)、与0°位置的夹角为-74.87°处(D点)、与0°位置的夹角为-56.08°处(E点)、与0°位置的夹角为-34.48°处(K点)、0°位置处(A点)、与0°位置的夹角为34.44°处(L点)、与0°位置的夹角为58.88°处(F点)、与0°位置的夹角为81.4°处(M点)、与0°位置的夹角为113.94°处(G点)、与0°位置的夹角为146.99°处(N点)、与0°位置的夹角为175.37°处(H点)和与0°位置的夹角为194.11°处(I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B点至I点的轮廓线(C1线)由圆滑过渡的曲线依次连接B点、J点、 C点、D点、E点、K点、A点、L点、F点、M点、G点、N点、H点和I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B点至I点的轮廓线(C1线)可以由B点、J点、C点、D点、E点、K点、A点、L点、F点、M点、G点、N点、H点和I点经过曲线拟合得到。
其中，侧壁13的内表面131的轮廓线在与0°位置的夹角为-88.72°处(J点)、与0°位置的夹角为-87.24°处(C点)和与0°位置的夹角为-74.87°处(D点)之间的连线朝安装腔101一侧凸出并形成蜗壳10的舌部102。
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，本发明实施方式的离心风扇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 (24)

  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，所述叶片包括背风面，所述背风面为弧面，所述背风面在所述连接端与所述外周壁相交处的所述夹角为107.7°±5°，所述背风面在所述自由端的终点处的所述夹角为81.4°±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背风面相背的迎风面，所述迎风面为弧面，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1所述的离心风扇，其特征在于，所述背风面的圆弧所在的圆的半径为18.5mm。
  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；
    以所述叶轮轴的轴线在所述下壳上的投影形成的点为坐标原点，以所述坐标原点到所述侧壁的内表面最近的点为0°位置，朝所述叶轮轴的转动方向为正向；
    在与0°位置的夹角为-88.94°处，所述侧壁的内表面与所述坐标原点之间的距离为26.35mm±5mm；
    在与0°位置的夹角为-87.24°处，所述侧壁的内表面与所述坐标原点之间的距离为19.02mm±5mm；
    在与0°位置的夹角为-74.87°处，所述侧壁的内表面与所述坐标原点之间的距离为17.65mm±5mm；
    在与0°位置的夹角为-56.08°处，所述侧壁的内表面与所述坐标原点之间的距离为17.62mm±5mm；
    在与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17.11mm±5mm；
    在与0°位置的夹角为58.88°处，所述侧壁的内表面与所述坐标原点之间的距离为17.51mm±5mm；
    在与0°位置的夹角为113.94°处，所述侧壁的内表面与所述坐标原点之间的距离为19.78mm±5mm；
    在与0°位置的夹角为175.37°处，所述侧壁的内表面与所述坐标原点之间的距离为22.92mm±5mm；
    在与0°位置的夹角为194.11°处，所述侧壁的内表面与所述坐标原点之间的距离为29.1mm±5mm。
  5. 根据权利要求4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-88.94°处、与0°位置的夹角为-87.24°处、与0°位置的夹角为-56.08°处、与0°位置处、与0°位置的夹角为58.88°处、与0°位置的夹角为113.94°处、与0°位置的夹角为175.37°处和与0°位置的夹角为194.11°处由圆滑过渡的曲线依次连接得到。
  6. 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-88.72°处，所述侧壁的内表面与所述坐标原点之间的距离为21.39mm±5mm；
    在与0°位置的夹角为-34.48°处，所述侧壁的内表面与所述坐标原点之间的距离为17.5mm±5mm；
    在与0°位置的夹角为31.44°处，所述侧壁的内表面与所述坐标原点之间的距离为17.13mm±5mm；
    在与0°位置的夹角为81.4°处，所述侧壁的内表面与所述坐标原点之间的距离为18.3mm±5mm；
    在与0°位置的夹角为146.99°处，所述侧壁的内表面与所述坐标原点之间的距离为20.1mm±5mm。
  7. 根据权利要求6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-88.94°处、与0°位置的夹角为-88.72°处、与0°位置的夹角为-87.24°处、与0°位置的夹角为-56.08°处、与0°位置的夹角为-34.48°处、与0°位置处、与0°位置的夹角为31.44°处、与0°位置的夹角为58.88°处、与0°位置的夹角为81.4°处、与0°位置的夹角为113.94°处、与0°位置的夹角为146.99°处、与0°位置的夹角为175.37°处和与0°位置的夹角为194.11°处由圆滑过渡的曲线依次连接得到。
  8. 根据权利要求4-7任意一项所述的离心风扇，其特征在于，自与0°位置处，朝所述叶轮轴的转动方向上，所述坐标原点与所述侧壁的内表面之间的距离逐渐增大；自与0°位置处，朝与所述叶轮轴的转动方向相反的方向上，所述坐标原点与所述侧壁的内表面之间的距离逐渐增大。
  9. 根据权利要求4所述的离心风扇，其特征在于，所述侧壁的一端开设有与所述安装腔连通的出气孔，所述上壳开设有与所述安装腔连通的进气孔，所述进气孔包括相连通的主体部及扩展部，所述主体部呈圆形，所述叶轮轴的轴线穿过所述主体部的圆心，所述扩展部设置所述主体部的远离所述出气孔的一端。
  10. 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17.5mm±3mm，所述叶轮外径为32mm±5mm，所述叶片的厚度为0.3mm±0.06mm，所述叶片的数量为29片±2片。
  11. 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。
  12. 根据权利要求11所述的离心风扇，其特征在于，所述叶轮还包括环状连接片，所述连接片环绕所述叶轮轴设置并连接多个所述叶片。
  13. 一种电子设备，其特征在于，包括：
    本体；及
    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；
    所述离心风扇包括：
    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，所述叶片包括背风面，所述背风面为弧面，所述背风面在所述连接端与所述外周壁相交处的所述夹角为107.7°±5°，所述背风面在所述自由端的终点处的所述夹角为81.4°±5°。
  14. 根据权利要求13所述的电子设备，其特征在于，所述叶片包括与所述背风面相背的迎风面，所述迎风面为弧面，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。
  15. 根据权利要求13所述的电子设备，其特征在于，所述背风面的圆弧所在的圆的半径为18.5mm。
  16. 根据权利要求13所述的电子设备，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；
    以所述叶轮轴的轴线在所述下壳上的投影形成的点为坐标原点，以所述坐标原点到所述侧壁的内表面最近的点为0°位置，朝所述叶轮轴的转动方向为正向；
    在与0°位置的夹角为-88.94°处，所述侧壁的内表面与所述坐标原点之间的距离为26.35mm±5mm；
    在与0°位置的夹角为-87.24°处，所述侧壁的内表面与所述坐标原点之间的距离为19.02mm±5mm；
    在与0°位置的夹角为-74.87°处，所述侧壁的内表面与所述坐标原点之间的距离为 17.65mm±5mm；
    在与0°位置的夹角为-56.08°处，所述侧壁的内表面与所述坐标原点之间的距离为17.62mm±5mm；
    在与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17.11mm±5mm；
    在与0°位置的夹角为58.88°处，所述侧壁的内表面与所述坐标原点之间的距离为17.51mm±5mm；
    在与0°位置的夹角为113.94°处，所述侧壁的内表面与所述坐标原点之间的距离为19.78mm±5mm；
    在与0°位置的夹角为175.37°处，所述侧壁的内表面与所述坐标原点之间的距离为22.92mm±5mm；
    在与0°位置的夹角为194.11°处，所述侧壁的内表面与所述坐标原点之间的距离为29.1mm±5mm。
  17. 根据权利要求16所述的电子设备，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-88.94°处、与0°位置的夹角为-87.24°处、与0°位置的夹角为-56.08°处、与0°位置处、与0°位置的夹角为58.88°处、与0°位置的夹角为113.94°处、与0°位置的夹角为175.37°处和与0°位置的夹角为194.11°处由圆滑过渡的曲线依次连接得到。
  18. 根据权利要求17所述的电子设备，其特征在于，
    在与0°位置的夹角为-88.72°处，所述侧壁的内表面与所述坐标原点之间的距离为21.39mm±5mm；
    在与0°位置的夹角为-34.48°处，所述侧壁的内表面与所述坐标原点之间的距离为17.5mm±5mm；
    在与0°位置的夹角为31.44°处，所述侧壁的内表面与所述坐标原点之间的距离为17.13mm±5mm；
    在与0°位置的夹角为81.4°处，所述侧壁的内表面与所述坐标原点之间的距离为18.3mm±5mm；
    在与0°位置的夹角为146.99°处，所述侧壁的内表面与所述坐标原点之间的距离为20.1mm±5mm。
  19. 根据权利要求18所述的电子设备，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-88.94°处、与0°位置的夹角为-88.72°处、与0°位置的夹角为-87.24°处、与0°位置的夹角为-56.08°处、与0°位置的夹角为-34.48°处、与0°位置处、与0°位置的夹角为31.44°处、与0°位置的夹角为58.88°处、与0°位置的夹角为81.4°处、与0°位置的夹角为113.94°处、与0°位置的夹角为146.99°处、与0°位置的夹角为175.37°处和与0°位置的夹角为194.11°处由圆滑过渡的曲线依次连接得到。
  20. 根据权利要求16-19任意一项所述的电子设备，其特征在于，自与0°位置处，朝所述叶轮轴的转动方向上，所述坐标原点与所述侧壁的内表面之间的距离逐渐增大；自与0°位置处，朝与所述叶轮轴的转动方向相反的方向上，所述坐标原点与所述侧壁的内表面之间的距离逐渐增大。
  21. 根据权利要求16所述的电子设备，其特征在于，所述侧壁的一端开设有与所述安装腔连通的出气孔，所述上壳开设有与所述安装腔连通的进气孔，所述进气孔包括相连通的主体部及扩展部，所述主体部呈圆形，所述叶轮轴的轴线穿过所述主体部的圆心，所述扩展部设置所述主体部的远离所述出气孔的一端。
  22. 根据权利要求13所述的电子设备，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17.5mm±3mm，所述叶轮外径为32mm±5mm，所述叶片的厚度为0.3mm±0.06mm，所述叶片的数量为29片±2片。
  23. 根据权利要求13所述的电子设备，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。
  24. 根据权利要求23所述的电子设备，其特征在于，所述叶轮还包括环状连接片，所述连接片环绕所述叶轮轴设置并连接多个所述叶片。
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