Diagonal flow fan

Abstract

An oblique flow type fan comprises a base, an outer cover, a motor and a hub. The outer cover is arranged on the base; the motor is arranged on the base; the hub is located between the outer cover and the motor. The hub comprises a first outer surface and a second outer surface which is connected to the first outer surface and is inclined relative to the first outer surface; the slope of the first outer surface relative to the central axis is greater than that of the second outer surface relative to the central axis; the base comprises a base side surface adjacent to the second outer surface; the slope of the base side relative to the central axis is equal to that of the second outer surface relative to the central axis.

Description

[0001] This application is a divisional application with application date of January 18, 2019, application number 2019100476472, and name “Diagonal Flow Fan”. Technical Field

[0002] The present invention mainly relates to a fan, in particular to a diagonal flow fan. Background Art

[0003] The size of current automotive electronic components is shrinking day by day, and fans need to provide the highest heat dissipation performance within a limited installation space to meet market demand. Although existing axial fans have a large air volume, they are often not usable due to the thickness of the axial fans and the flow direction restrictions of the electronic components on the air inlet and outlet.

[0004] However, although the use of a centrifugal fan (Blower) can overcome the limitation that the air inlet and outlet are in a vertical direction, the air volume is relatively low, and it is difficult to achieve the required heat dissipation efficiency.

[0005] Therefore, although the current fan meets the purpose of its use, it does not meet the requirements of many other aspects. Therefore, it is necessary to provide an improved solution for the fan. Summary of the invention

[0006] The present invention provides a diagonal flow fan, the air volume of which is between that of an axial flow fan and a centrifugal fan, which not only has good heat dissipation performance but also meets the requirements of flow channel turning.

[0007] The present invention provides a diagonal flow fan, comprising: a base; an outer cover, which is arranged on the base; a motor, which is arranged on the base and located in the outer cover; a hub, which is located between the outer cover and the motor, and is used to rotate around a central axis, and comprises a first outer surface and a second outer surface connected to the first outer surface and inclined relative to the first outer surface, and the slope of the first outer surface relative to the central axis is greater than the slope of the second outer surface relative to the central axis; and a fan blade, which is connected to the first outer surface and the second outer surface; the fan blade also comprises a first edge, a second edge connected to the first edge and inclined relative to the first edge, and a bottom edge, the slope of the first edge relative to the central axis is greater than the slope of the second edge relative to the central axis, and the bottom edge is connected to the first outer surface and the second outer surface. two edges and the second outer surface; wherein the base includes a first base body, a second base body and a plurality of support ribs, the first base body includes a first base side, the second base body includes a second base side facing the first base side, the slope of the first base side is greater than the slope of the second base side, the first base side is adjacent to the second outer surface, and the slope of the first base side relative to the central axis is equal to the slope of the second outer surface relative to the central axis; the outer cover includes a first inner surface facing the first outer surface and a second inner surface facing the second outer surface, and the slope of the first inner surface relative to the central axis is greater than the slope of the second inner surface relative to the central axis, and the slope of the first inner surface relative to the central axis is equal to the slope of the first outer surface relative to the central axis.

[0008] In some embodiments, in the diagonal flow fan, the area of ​​the first outer surface is approximately in a range of 2 to 10 times the area of ​​the second outer surface.

[0009] In some embodiments, in the diagonal flow fan, the second edge is closer to the base than the first edge, and the length of the first edge is greater than twice the length of the second edge.

[0010] In some embodiments, in the diagonal flow fan, the base includes a bottom channel, and a main channel connected to the bottom channel is formed between the outer cover and the hub, wherein the main channel extends approximately along a first direction, the bottom channel extends approximately along a second direction, and a first acute angle between the first direction and the center axis is greater than a second acute angle between the second direction and the center axis.

[0011] In some embodiments, in the diagonal flow fan, the main channel includes a main air inlet and a main air outlet relative to the main air inlet, and the main air outlet is connected to the bottom channel; wherein the width of the main channel gradually narrows from the main air inlet to the main air outlet.

[0012] In some embodiments, in the diagonal flow fan, the main air inlet and the main air outlet are both annular.

[0013] In some embodiments, in the diagonal flow fan, the first acute angle is greater than 20 degrees, and the second acute angle is less than 15 degrees.

[0014] In some embodiments, in the diagonal flow fan, the first outer surface is a concave surface, and the first inner surface is a convex surface.

[0015] In some embodiments, in the diagonal flow fan, the motor is disposed on the first base body; the second base body surrounds the first base body and is spaced apart from the first base body; the support rib is connected to the first base body and the second base body, wherein the bottom channel is formed between the first base body and the second base body, and the support rib is located in the bottom channel.

[0016] In some embodiments, the diagonal flow fan further includes a circuit board electrically connected to the motor, wherein the first base body includes a receiving groove, and the circuit board is located in the receiving groove.

[0017] In some embodiments, in the diagonal flow fan, a thickness of the diagonal flow fan is less than 10 times a depth of the accommodating groove, and the depth and the thickness are measured in a longitudinal direction parallel to the central axis.

[0018] In some embodiments, in the diagonal flow fan, the diameter of the first base body is greater than 1.6 times the diameter of the motor, and the diameter of the first base body and the diameter of the motor are measured in a transverse direction perpendicular to the central axis.

[0019] In some embodiments, in the diagonal flow fan, the bottom channel is formed between the first base side and the second base side, wherein a first angle between the extension direction of the first base side and the central axis is less than or equal to a second angle between the extension direction of the second base side and the central axis.

[0020] In some embodiments, in the diagonal flow fan, the second base body is an annular structure and is perpendicular to the central axis.

[0021] In some embodiments, in the diagonal flow fan, the fan blade is an airfoil structure, and the fan blade has a variety of thicknesses.

[0022] The present invention also provides a diagonal flow fan, comprising: a base; an outer cover, arranged on the base; a motor, arranged on the base and located in the outer cover; a hub, located between the outer cover and the motor, wherein the hub is used to rotate around a central axis and includes an outer surface; and a fan blade connected to the outer surface; wherein the base includes a first base body, a second base body and a plurality of support ribs, the first base body includes a first base side surface, the second base body includes a second base side surface facing the first base side surface, and the slope of the first base side surface is greater than that of the second base side surface. The fan blade further comprises a first edge, a second edge connected to the first edge and inclined relative to the first edge, and a bottom edge, the slope of the first edge relative to the central axis is greater than the slope of the second edge relative to the central axis, and the bottom edge is connected to the second edge and the outer surface; the outer cover comprises an inner surface facing the outer surface, the slope of the inner surface relative to the central axis is equal to the slope of the outer surface relative to the central axis.

[0023] In some embodiments, in the diagonal flow fan, the second edge is closer to the base than the first edge, and the length of the first edge is greater than twice the length of the second edge.

[0024] In summary, the structural design of the main channel and the bottom channel of the diagonal flow fan of the present invention can make the diagonal flow fan of the present invention have a larger air volume than the existing centrifugal fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a perspective view of a diagonal flow fan according to a first embodiment of the present invention.

[0026] Figure 2 is an exploded view of a diagonal flow fan according to a first embodiment of the present invention.

[0027] Figure 3 is a cross-sectional view of a diagonal flow fan according to a first embodiment of the present invention.

[0028] Figure 4 It is a stereoscopic diagram of a hub and fan blades according to a second embodiment of the present invention.

[0029] Figure 5 is a cross-sectional view of a diagonal flow fan according to a second embodiment of the present invention.

[0030] Figure 6 is a cross-sectional view of a diagonal flow fan according to a third embodiment of the present invention.

[0031] Figure 7 is a cross-sectional view of a diagonal flow fan according to a fourth embodiment of the present invention.

[0032] Figure 8 is a cross-sectional view of a diagonal flow fan according to a fifth embodiment of the present invention.

[0033] Fig. 9 It is a wind tunnel test data diagram of the diagonal flow fan of the present invention and the existing centrifugal fan.

[0034] Description of Reference Numerals 1: Diagonal flow fan 10: Base 11: The first base body 111: Bearing surface 112: Storage tank 113: Bushing 114: Side of the first base 12: Second base body 121: Side of the second base 13: Support ribs 14: Bottom channel 20: Outer cover 21: Inner surface (first inner surface) 22: Second inner surface 30: Circuit Board 40: Motor 41: Bearings 42: Shaft 43: Stator 431: Electromagnet 44: Rotor 441: Permanent magnet 50: Wheel hub 51: Outer surface (first outer surface) 52: Outer surface (second outer surface) 60: Fan blade 61: First Edge 62: The Second Edge 63: Bottom edge 70: Main channel 71: Main air inlet 72: Main air outlet A1: First acute angle A2: Second acute angle A3, A4, A6: Angle AX1: Center axis D1: First direction D2: Second direction D3, D4, D5, D6, D9, D10, D11, D12, D13, D14, D15: Extension direction D7: Horizontal D8: Vertical d1, d3, d4, d5: diameter d2: maximum diameter H1: Depth T1: Thickness DETAILED DESCRIPTION The following description provides many different embodiments, or examples, for implementing different features of the present invention. The components and arrangements described in the following specific examples are only used to simplify the present invention and are only used as examples, not to limit the present invention. For example, a description of a structure in which a first feature is on or above a second feature includes direct contact between the first and second features, or another feature is disposed between the first and second features so that the first and second features are not in direct contact.

[0035] Spatially relative terms such as above or below are used herein only to simply describe the relationship of one element or feature relative to another element or feature in the drawings. In addition to the orientations described in the drawings, the device may be used or operated in different orientations. The shapes, sizes, thicknesses, and angles of inclination in the drawings may not be drawn to scale or may be simplified for the purpose of clarity and are provided for illustration only.

[0036] Figure 1 FIG. 1 is a perspective view of a diagonal flow fan 1 according to a first embodiment of the present invention. Figure 2 FIG. 1 is an exploded view of a diagonal flow fan 1 according to a first embodiment of the present invention. Figure 3 1 is a cross-sectional view of a diagonal flow fan 1 according to a first embodiment of the present invention. The diagonal flow fan 1 comprises a base 10 , an outer cover 20 , a circuit board 30 , a motor 40 , a hub 50 and a plurality of fan blades 60 .

[0037] The outer cover 20 is disposed on the base 10. The circuit board 30 is disposed on the base 10 and is located inside the outer cover 20. The motor 40 is disposed on the circuit board 30 and is electrically connected to the circuit board 30. The hub 50 is located between the outer cover 20 and the motor 40, and the fan blades 60 are connected to the hub 50. The hub 50 and the fan blades 60 are driven by the driving motor 40 to rotate, thereby generating an airflow.

[0038] The base 10 may be a substantially plate-shaped structure. In this embodiment, a central axis AX1 passes through the center of the base 10, and the base 10 extends substantially perpendicular to the central axis AX1. In some embodiments, the base 10 may be made of plastic. The base 10 may include a first base body 11, a second base body 12, and a plurality of support ribs 13.

[0039] The first base body 11 may be a plate-shaped structure and extend substantially perpendicular to the central axis AX1. In the present embodiment, the first base body 11 may be a disc-shaped structure. The first base body 11 may have a bearing surface 111, a receiving groove 112, and a sleeve 113. The bearing surface 111 may be a main surface of the first base body 11 and faces the wheel hub 50.

[0040] The receiving groove 112 is formed on the bearing surface 111. In the present embodiment, the receiving groove 112 may be annular, and the central axis AX1 passes through the center of the receiving groove 112. The shaft sleeve 113 is disposed at the bottom of the receiving groove 112 and may extend along the central axis AX1. In the present embodiment, the shaft sleeve 113 is a cylindrical hollow structure, and the central axis AX1 passes through the center of the shaft sleeve 113.

[0041] The second base body 12 may be an annular structure and extends substantially perpendicular to the central axis AX1. The central axis AX1 may pass through the center of the second base body 12. The second base body 12 surrounds the first base body 11 and is spaced apart from the first base body 11.

[0042] The support ribs 13 are connected to the first base body 11 and the second base body 12. In this embodiment, the number of the support ribs 13 is four, but not limited thereto. In some embodiments, the number of the support ribs 13 may be three, or five or more.

[0043] A bottom channel 14 is formed between the first base body 11 and the second base body 12. The bottom channel 14 may be annular and surround the first base body 11. The support ribs 13 are located in the bottom channel 14. In some embodiments, the volume of all the support ribs 13 is less than 0.3 times the volume of the bottom channel 14.

[0044] In this embodiment, the first base body 11 , the supporting ribs 13 and the second base body 12 may be made of plastic and may be an integrally formed structure.

[0045] The outer cover 20 may be an annular structure, disposed on the second base body 12. The central axis AX1 may pass through the center of the outer cover 20. The motor 40, the hub 50, the fan blades 60 and other components may be located in the outer cover 20. In some embodiments, the second base body 12 may be a part of the outer cover 20, and the second base body 12 may be fixed to the support rib 13.

[0046] like Figure 2 and Figure 3As shown, the circuit board 30 is electrically connected to the motor 40 and is located in the receiving groove 112 of the first base body 11. In this embodiment, the circuit board 30 can be an annular structure and can extend substantially perpendicular to the central axis AX1. The central axis AX1 can pass through the center of the circuit board 30.

[0047] like Figure 3 As shown, the diameter d1 of the first base body 11 can be substantially equal to the maximum diameter d2 of the hub 50, so that the first base body 11 will not block the airflow generated by the diagonal flow fan 1. In this embodiment, the diameter d1 of the first base body 11 is greater than 1.6 times, 1.7 times, or 1.8 times the diameter d3 of the motor 40. In some embodiments, the diameter d1 of the first base body 11 and the maximum diameter d2 of the hub 50 are approximately 41 mm, and the diameter d3 of the motor 40 is approximately 22.8 mm. The diameter d1 of the first base body 11, the maximum diameter d2 of the hub 50, and the diameter d3 of the motor 40 are measured in a horizontal direction D7 perpendicular to the central axis AX1.

[0048] In some embodiments, the diameter d5 of the base 10 is about 75 mm. The diameter d5 of the base 10 is greater than 2.8 times, 3.0 times, or 3.2 times the diameter d3 of the motor 40. The diameter d4 of the accommodating groove 112 is about 39 mm. The diameter d4 of the accommodating groove 112 is slightly smaller than the diameter d1 of the first base body 11. In other words, the diameter d4 of the accommodating groove 112 may be greater than 1.6 times, 1.7 times, or 1.8 times the diameter d3 of the motor 40.

[0049] In some embodiments, the depth H1 of the accommodating groove 112 is about 2.5 mm. The diameter d4 of the accommodating groove 112 is greater than 15 times, 16 times, or 17 times the depth H1 of the accommodating groove 112. The thickness T1 of the diagonal flow fan 1 is about 22 mm. The thickness T1 of the diagonal flow fan 1 is less than 8 times, 9 times, or 10 times the depth H1 of the accommodating groove 112, and the depth H1 and the thickness T1 are measured in a longitudinal direction D8 parallel to the central axis AX1.

[0050] Therefore, through the structure of the hub 50 and the base 10 , a larger receiving groove 112 can be formed in the first base body 11 . Therefore, more electronic components and circuit boards 30 can be accommodated in the receiving groove 112 .

[0051] like Figure 3 As shown, the motor 40 is located on the circuit board 30 and is electrically connected to the circuit board 30. The circuit board 30 is used to transmit a driving signal to the motor 40, and the motor 40 rotates the hub 50 according to the driving signal.

[0052] In this embodiment, the motor 40 is disposed on the first base body 11, and includes a bearing 41, a rotating shaft 42, a stator 43, and a rotor 44. The bearing 41 is fixed in the sleeve 113. The rotating shaft 42 is rotatably disposed in the bearing 41 and extends along the central axis AX1. The rotating shaft 42 can rotate around the central axis AX1, and one end of the rotating shaft 42 is fixed in the wheel hub 50.

[0053] The stator 43 is disposed on the circuit board 30 and can be electrically connected to the circuit board 30. In the present embodiment, the stator 43 can be fixed to the sleeve 113. The rotor 44 is fixed in the hub 50 and surrounds the stator 43. In the present embodiment, the rotor 44 is adjacent to the stator 43 and can rotate relative to the stator 43. In some embodiments, the stator 43 may include a plurality of electromagnets 431, and the rotor 44 may include a plurality of permanent magnets 441. Through the magnetic force between the stator 43 and the rotor 44, the stator 43 drives the rotor 44 to rotate around the central axis AX1, thereby driving the hub 50 and the fan blades 60 to rotate.

[0054] The wheel hub 50 can cover the outside and top of the motor 40 and can rotate around the central axis AX1. The wheel hub 50 is located in the outer cover 20, and a main channel 70 is formed between the wheel hub 50. The main channel 70 is connected to the bottom channel 14 of the base 10. In this embodiment, the main channel 70 is annular and surrounds the wheel hub 50. The main channel 70 includes a main air inlet 71 and a main air outlet 72 opposite to the main air inlet 71. The main air outlet 72 is connected to the bottom channel 14.

[0055] In this embodiment, the main air inlet 71 and the main air outlet 72 may be annular. The central axis AX1 may pass through the center of the main air inlet 71 and the main air outlet 72. The main air inlet 71 and the main air outlet 72 may extend perpendicular to the central axis AX1. In some embodiments, the area of ​​the main air inlet 71 may be equal to or substantially equal to the main air outlet 72. The width of the main channel 70 gradually narrows from the main air inlet 71 to the main air outlet 72.

[0056] When the fan blades 60 rotate, the fan blades 60 generate an airflow. The airflow enters the diagonal flow fan 1 and the main channel 70 through the main air inlet 71, and flows into the bottom channel 14 of the base 10 through the main air outlet 72. Through the structure of the main channel 70, the airflow can stably pass through the main channel 70.

[0057] In this embodiment, the main channel 70 extends approximately along a first direction D1, and the bottom channel 14 extends approximately along a second direction D2. A first acute angle A1 between the first direction D1 and the central axis AX1 is greater than a second acute angle A2 between the second direction D2 and the central axis AX1. The first direction D1 and the second direction D2 may pass through the central axis AX1, and the first direction D1, the second direction D2, and the central axis AX1 may be located in the same plane. The design of the main channel 70 and the bottom channel 14 may increase the air volume of the diagonal flow fan 1.

[0058] In some embodiments, the first acute angle A1 is greater than 20 degrees, and the second acute angle A2 is less than 15 degrees. In some embodiments, the first acute angle A1 is about 30 degrees, and the second acute angle A2 is about 10 degrees. In some embodiments, the second acute angle A2 may be 0 degrees. In other words, the second direction D2 is parallel to the central axis AX1.

[0059] In this embodiment, the hub 50 includes an outer surface 51. The outer cover 20 includes an inner surface 21 facing the outer surface 51. The outer surface 51 and the inner surface 21 are both annular. The main channel 70 is formed between the outer surface 51 and the inner surface 21. The outer surface 51 can be a concave surface, and the inner surface 21 can be a convex surface, thereby providing the air volume of the flow fan.

[0060] exist Figure 3 In the embodiment, the slope of the inner surface 21 is greater than the slope of the outer surface 51. An angle A3 between the extension direction D3 of the outer surface 51 and the central axis AX1 is greater than an angle A4 between the extension direction D4 of the inner surface 21 and the central axis AX1. In some embodiments, the angle A3 is greater than 40 degrees, and the angle A4 is less than 30 degrees. In addition, in some embodiments, the angle A3 is greater than the first acute angle A1, and the angle A4 is less than the first acute angle A1. The extension direction D3 and the extension direction D4 may pass through the central axis AX1, and the extension direction D3, the extension direction D4, and the central axis AX1 may be located in the same plane.

[0061] The first base body 11 includes a first base side surface 114. The second base body 12 includes a second base side surface 121 facing the first base side surface 114. The first base side surface 114 and the second base side surface 121 may be annular. The bottom channel 14 is formed between the first base side surface 114 and the second base side surface 121.

[0062] exist Figure 3In the embodiment, the slope of the first base side surface 114 is greater than the slope of the second base side surface 121. An angle between the extension direction D5 of the first base side surface 114 and the central axis AX1 is less than or equal to an angle A6 between the extension direction D6 of the second base side surface 121 and the central axis AX1. In some embodiments, the angle between the extension direction D5 and the central axis AX1 is less than 8 degrees, and the angle A6 is less than 20 degrees. In some embodiments, the angle between the extension direction D5 and the central axis AX1 is less than 5 degrees, and the angle A6 is less than 3 degrees. In other words, the second base side surface 121 is inclined relative to the first base side surface 114.

[0063] In some embodiments, the included angle between the extension direction D5 and the central axis AX1 and the included angle A6 are equal. In other words, the first base side surface 114 is parallel to the second base side surface 121. In some embodiments, the included angle between the extension direction D5 and the central axis AX1 and the included angle A6 are 0 degrees. In other words, the first base side surface 114 and the second base side surface 121 extend parallel to the central axis AX1.

[0064] In addition, in some embodiments, the angle A6 is greater than the second acute angle A2, and the angle between the extension direction D5 and the central axis AX1 is less than the second acute angle A2. In some embodiments, the angle A3 and the angle A4 are greater than the angle between the extension direction D5 and the central axis AX1 and the angle A6. The extension direction D5 and the extension direction D6 may pass through the central axis AX1, and the extension direction D5, the extension direction D6, and the central axis AX1 may be located in the same plane.

[0065] In this embodiment, the hub 50 further includes an outer surface 52. The outer surface 52 is connected to an end of the outer surface 51 adjacent to the first base body 11. The outer surface 52 may be annular and have the same diameter d1 as the first base body 11. The outer surface 52 extends along the same extension direction D5 as the first base side surface 114. The outer surface 52 allows the airflow to enter the bottom channel 14 from the main channel 70 more smoothly.

[0066] Figure 4 FIG. 5 is a perspective view of a hub 50 and a fan blade 60 according to a second embodiment of the present invention. Figure 5 2 is a cross-sectional view of a diagonal flow fan 1 according to a second embodiment of the present invention. In this embodiment, the hub 50 includes a first outer surface (outer surface) 51 and a second outer surface (outer surface) 52. The first outer surface 51 and the second outer surface 52 may be annular and face the outer cover 20. The first outer surface 51 is connected to the second outer surface 52 and is inclined relative to the second outer surface 52.

[0067] In this embodiment, the slope of the first outer surface 51 relative to the central axis AX1 is greater than the slope of the second outer surface 52 relative to the central axis AX1, that is, the angle between the extension direction D9 of the first outer surface 51 and the central axis AX1 is greater than the angle between the extension direction D10 of the second outer surface 52 and the central axis AX1, and the extension direction D9 of the first outer surface 51 is the extension direction D9 formed by two points, such as the highest point of the first outer surface 51 and the adjacent point of the first outer surface 51 and the second outer surface 52, and the extension direction D10 of the second outer surface 52 is the extension direction D10 formed by two points, such as the adjacent point of the first outer surface 51 and the second outer surface 52 and the lowest point of the second outer surface 52. The area of ​​the first outer surface 51 is approximately in the range of 2 times to 10 times the area of ​​the second outer surface 52. The area of ​​the first outer surface 51 is greater than 2 times the area of ​​the second outer surface 52. On a cross section passing through the central axis AX1, the first outer surface 51 can be a concave surface, and the second outer surface 52 can be a plane.

[0068] The fan blade 60 is connected to the first outer surface 51 and the second outer surface 52. The fan blade 60 also includes a first edge 61, a second edge 62, and a bottom edge 63. The first edge 61 is opposite to the first outer surface 51, and the second edge 62 is opposite to the second outer surface 52. The first edge 61 is connected to the second edge 62 and is inclined relative to the second edge 62. The second edge 62 is closer to the base 10 than the first edge 61. The bottom edge 63 is connected to the second edge 62 and the second outer surface 52. The bottom edge 63 can extend perpendicular to the central axis AX1.

[0069] In this embodiment, the slope of the first edge 61 relative to the central axis AX1 is greater than the slope of the second edge 62 relative to the central axis AX1, that is, the angle between the extension direction D11 of the first edge 61 and the central axis AX1 is greater than the angle between the extension direction D12 of the second edge 62 and the central axis AX1, and the extension direction D11 of the first edge 61 is the extension direction D11 formed by two points such as the highest point of the first edge 61 and the adjacent point of the first edge 61 and the second edge 62, and the extension direction D12 of the second edge 62 is the extension direction D12 formed by two points such as the adjacent point of the first edge 61 and the second edge 62 and the lowest point of the second edge 62. The length of the first edge 61 is greater than twice the length of the second edge 62. In some embodiments, the length of the first edge 61 is approximately in the range of 2 to 10 times the length of the second edge 62. The length of the first edge 61 is greater than twice the length of the second edge 62.

[0070] The outer cover 20 includes a first inner surface (inner surface) 21 and a second inner surface 22. The first inner surface 21 faces the first outer surface 51, and the second inner surface 22 faces the second outer surface 52. The first inner surface 21 and the second inner surface 22 may be annular. The first inner surface 21 is connected to the second inner surface 22 and is inclined relative to the second inner surface 22. In addition, the first edge 61 faces the first inner surface 21, and the second edge 62 faces the second inner surface 22.

[0071] In this embodiment, the slope of the first inner surface 21 relative to the central axis AX1 is greater than the slope of the second inner surface 22 relative to the central axis AX1, that is, the angle between the extension direction D13 of the first inner surface 21 and the central axis AX1 is greater than the angle between the extension direction D14 of the second inner surface 22 and the central axis AX1, and the extension direction D13 of the first inner surface 21 is the equal high point of the first inner surface 21 relative to the highest point of the first outer surface 51, and the extension direction D13 formed by two points such as the adjacent points of the first inner surface 21 and the second inner surface 22, and the extension direction D14 of the second inner surface 22 is the extension direction D14 formed by two points such as the adjacent points of the first inner surface 21 and the second inner surface 22 and the lowest point of the second inner surface 22. In addition, the slope of the first inner surface 21 relative to the central axis AX1 may be equal to or substantially equal to the slope of the first outer surface 51 relative to the central axis AX1, that is, the angle between the extension direction D13 of the first inner surface 21 and the central axis AX1 may be equal to or substantially equal to the angle between the extension direction D9 of the first outer surface 51 and the central axis AX1. The slope of the second inner surface 22 relative to the central axis AX1 may be equal to or substantially equal to the slope of the second outer surface 52 relative to the central axis AX1, that is, the angle between the extension direction D14 of the second inner surface 22 and the central axis AX1 may be equal to or substantially equal to the angle between the extension direction D10 of the second outer surface 52 and the central axis AX1.

[0072] In this embodiment, the area of ​​the first inner surface 21 is approximately 2 to 10 times the area of ​​the second inner surface 22. In a cross section passing through the central axis AX1, the first inner surface 21 may be a convex surface, and the second inner surface 22 may be a flat surface.

[0073] like Figure 5 As shown, the first base side surface 114 is adjacent to the second outer surface 52, and the slope of the first base side surface 114 relative to the central axis AX1 is equal to the slope of the second outer surface 52 relative to the central axis AX1, that is, the angle between the extension direction D15 of the first base side surface 114 and the central axis AX1 is equal to the angle between the extension direction D10 of the second outer surface 52 and the central axis AX1.

[0074] Figure 6FIG. 1 is a cross-sectional view of a diagonal flow fan 1 according to a third embodiment of the present invention. In the third embodiment, relative to the second embodiment, the fan blade 60 does not include the second edge 62. The bottom edge 63 is connected to the first edge 61 and the second outer surface 52. The second outer surface 52 faces the bottom edge 63.

[0075] Figure 7 is a cross-sectional view of a diagonal flow fan 1 according to a fourth embodiment of the present invention. In the fourth embodiment, relative to the second embodiment, the hub 50 does not include a second outer surface 52. The fan blades 60 are connected to the outer surface 51. The first base side surface 114 of the base 10 is adjacent to the outer surface 51. The slope of the outer surface 51 relative to the central axis AX1 is greater than the slope of the first base side surface 114 relative to the central axis AX1, that is, the angle between the extension direction D9 of the outer surface 51 and the central axis AX1 is greater than the angle between the extension direction D15 of the first base side surface 114 and the central axis AX1, and the extension direction D9 of the outer surface 51 is the extension direction D9 formed by two points such as the highest point and the lowest point of the outer surface 51.

[0076] Figure 8 FIG. 5 is a cross-sectional view of a diagonal flow fan 1 according to a fifth embodiment of the present invention. In the fifth embodiment, relative to the fourth embodiment, the fan blade 60 does not include the second edge 62. The bottom edge 63 is connected to the first edge 61 and the second outer surface 52. The second outer surface 52 faces the bottom edge 63.

[0077] Fig. 9 The wind tunnel test data of the diagonal flow fan 1 of the present invention and the existing centrifugal fan are shown in FIG. Figure 4 In the invention, a diagonal flow fan 1 and an existing centrifugal fan of similar size are used. Under the same system impedance, the air volume of the existing centrifugal fan can only reach 6 CFM, while the diagonal flow fan 1 disclosed in the present application can reach 10 CFM. Therefore, the air volume of the diagonal flow fan 1 can be increased by the design of the above-mentioned main channel 70 and the bottom channel 14. In addition, under the same rotation speed (for example, 5900 RPM), the noise of the diagonal flow fan 1 disclosed in the present application is about 38.7 dBA, while the noise of the existing centrifugal fan is about 43dBA. Therefore, the noise of the diagonal flow fan disclosed in the present application can be lower than that of the existing centrifugal fan.

[0078] In summary, the structural design of the main channel and the bottom channel of the diagonal flow fan of the present invention can make the diagonal flow fan of the present invention have a larger air volume than the existing centrifugal fan.

[0079] Although the present invention is disclosed in various embodiments as above, they are only exemplary references and are not intended to limit the scope of the present invention. Any person skilled in the art may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the above embodiments are not intended to limit the scope of the present invention, and the scope of protection of the present invention shall be subject to the scope defined in the claims.

Claims

1. A diagonal flow fan, characterized in that: include: A base; an outer cover disposed on the base; a motor, disposed on the base and located inside the housing; a hub, located between the housing and the motor, for rotating about a central axis, and comprising a first outer surface and a second outer surface connected to the first outer surface and inclined relative to the first outer surface, wherein the slope of the first outer surface relative to the central axis is greater than the slope of the second outer surface relative to the central axis; and A fan blade connected to the first outer surface and the second outer surface; The fan blade further includes a first edge, a second edge connected to the first edge and inclined relative to the first edge, and a bottom edge, wherein the slope of the first edge relative to the central axis is greater than the slope of the second edge relative to the central axis, and the bottom edge is connected to the second edge and the second outer surface; The base includes a first base body, a second base body and a plurality of support ribs, the first base body includes a first base side surface, the second base body includes a second base side surface facing the first base side surface, and the slope of the first base side surface is greater than the slope of the second base side surface. The first base side surface is adjacent to the second outer surface, and a slope of the first base side surface relative to the central axis is equal to a slope of the second outer surface relative to the central axis; The outer cover includes a first inner surface facing the first outer surface and a second inner surface facing the second outer surface, and the slope of the first inner surface relative to the central axis is greater than the slope of the second inner surface relative to the central axis, and the slope of the first inner surface relative to the central axis is equal to the slope of the first outer surface relative to the central axis.

2. The diagonal flow fan according to claim 1, characterized in that: The area of ​​the first outer surface is approximately in a range of 2 to 10 times the area of ​​the second outer surface.

3. The diagonal flow fan according to claim 1, wherein: The second edge is closer to the base than the first edge, and the length of the first edge is greater than twice the length of the second edge.

4. The diagonal flow fan according to claim 1, characterized in that: The base includes a bottom channel, and a main channel connected to the bottom channel is formed between the outer cover and the hub, wherein the main channel extends approximately along a first direction, the bottom channel extends approximately along a second direction, and a first acute angle between the first direction and the central axis is greater than a second acute angle between the second direction and the central axis.

5. The diagonal flow fan according to claim 4, characterized in that: The main channel includes a main air inlet and a main air outlet relative to the main air inlet, and the main air outlet is connected to the bottom channel; The width of the main channel gradually narrows from the main air inlet to the main air outlet.

6. The diagonal flow fan according to claim 4, characterized in that: The main air inlet and the main air outlet are both annular.

7. The diagonal flow fan according to claim 4, characterized in that: The first acute angle is greater than 20 degrees, and the second acute angle is less than 15 degrees.

8. The diagonal flow fan according to claim 1, wherein: The first outer surface is a concave surface, and the first inner surface is a convex surface.

9. The diagonal flow fan according to claim 4, characterized in that: The motor is disposed on the first base body; The second base body surrounds the first base body and is spaced apart from the first base body; The supporting rib is connected to the first base body and the second base body. The bottom channel is formed between the first base body and the second base body, and the supporting rib is located in the bottom channel.

10. The diagonal flow fan according to claim 9, characterized in that: It also includes a circuit board electrically connected to the motor, wherein the first base body includes a receiving groove, and the circuit board is located in the receiving groove.

11. The diagonal flow fan according to claim 10, wherein: The thickness of the diagonal flow fan is less than 10 times the depth of the accommodating groove, and the depth and the thickness are measured in a longitudinal direction parallel to the central axis.

12. The diagonal flow fan according to claim 9, wherein: The diameter of the first base body is greater than 1.6 times the diameter of the motor, and the diameter of the first base body and the diameter of the motor are measured in a transverse direction perpendicular to the central axis.

13. The diagonal flow fan according to claim 9, characterized in that: The bottom channel is formed between the first base side and the second base side, A first angle between the extension direction of the first base side surface and the central axis is less than or equal to a second angle between the extension direction of the second base side surface and the central axis.

14. The diagonal flow fan according to claim 13, wherein: The second base body is an annular structure and is perpendicular to the central axis.

15. The diagonal flow fan according to claim 1, wherein: The fan blade is an airfoil structure and has various thicknesses.

16. A diagonal flow fan, characterized in that: include: A base; an outer cover disposed on the base; a motor, disposed on the base and located inside the housing; a hub located between the housing and the motor, wherein the hub is used to rotate about a central axis and includes an outer surface; and a fan blade connected to the outer surface; The base includes a first base body, a second base body and a plurality of support ribs, the first base body includes a first base side surface, the second base body includes a second base side surface facing the first base side surface, the slope of the first base side surface is greater than the slope of the second base side surface, the first base side surface is adjacent to the outer surface, and the slope of the outer surface relative to the central axis is greater than the slope of the first base side surface relative to the central axis; The fan blade further comprises a first edge, a second edge connected to the first edge and inclined relative to the first edge, and a bottom edge, wherein the slope of the first edge relative to the central axis is greater than the slope of the second edge relative to the central axis, and the bottom edge is connected to the second edge and the outer surface; The outer cover includes an inner surface facing the outer surface, and a slope of the inner surface relative to the central axis is equal to a slope of the outer surface relative to the central axis.

17. The diagonal flow fan according to claim 16, wherein: The second edge is closer to the base than the first edge, and the length of the first edge is greater than twice the length of the second edge.

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