Low-noise and high-efficiency fan

Abstract

The utility model relates to a low-noise high-efficiency fan which comprises a fixed impeller, a plurality of guide vanes are arranged in the fixed impeller and are distributed in an annular array mode in the circumferential direction of the fixed impeller, a machine shell air channel is arranged between every two adjacent guide vanes, and the guide vanes are in an arc shape and are obliquely arranged towards the center of the fixed impeller. The adjacent guide vanes are arranged at intervals in the circumferential direction of the fixed impeller, a first gap is formed between the adjacent guide vanes, the first gap penetrates through an inlet of the machine shell air channel in the axial direction of the fixed impeller, and the width of the projection of the first gap in the axial direction is gradually reduced from the edge of the fixed impeller to the center of the fixed impeller. By optimizing the layout of the guide vanes, air compression is accelerated, the flow speed of air flow in the guide vanes is increased, and the heat dissipation efficiency of the air flow to the stator assembly is remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to a low-noise and high-efficiency fan. Background Technology

[0002] Thermal management and noise control of fans directly affect their operational quality, and the casing structure design has a decisive impact on the fan's heat dissipation performance and noise control. Fans on the market usually adopt a ring array casing blade structure, with adjacent blades arranged in a circumferential overlapping manner along the rotor axis. This objectively reduces the cross-sectional area of ​​the blade flow channel. When the high-speed rotating rotor assembly drives the airflow through the narrow flow channel, the internal flow velocity of the guide vanes is significantly reduced. Especially in the core area where the stator assembly is located, the airflow velocity often cannot meet the design cooling requirements. Under the overlapping blade structure, the heat generated by the stator assembly during continuous operation cannot be dissipated in time, resulting in a rapid temperature rise. How to optimize the blade layout to improve the airflow velocity in the core area has become the key to the thermal management efficiency of fans. Summary of the Invention

[0003] Therefore, the technical problem to be solved by this utility model is to overcome the problem that the airflow velocity inside the blades is reduced due to the overlapping arrangement of blades in the rotor axis in the prior art, resulting in poor heat dissipation of the stator assembly. In this way, a low-noise and high-efficiency fan is provided. By optimizing the layout of the guide vanes, accelerating air compression and increasing the airflow velocity inside the guide vanes, the heat dissipation efficiency of the airflow on the stator assembly is significantly improved.

[0004] To solve the above-mentioned technical problems, this utility model provides a low-noise, high-efficiency fan, comprising:

[0005] A fixed impeller has multiple guide vanes inside, which are arranged in a circumferential ring array along the fixed impeller. A casing air duct is provided between adjacent guide vanes. The guide vanes are arc-shaped and inclined towards the center of the fixed impeller. Adjacent guide vanes are spaced apart along the circumference of the fixed impeller, forming a first gap between them. The first gap extends through the inlet of the casing air duct along the axial direction of the fixed impeller, and the width of the projection of the first gap along the axial direction gradually decreases from the edge of the fixed impeller to the center of the fixed impeller.

[0006] In one embodiment of the present invention, a rotor assembly and a stator assembly sleeved outside the rotor assembly are further included. An air gap is provided between the magnet of the rotor assembly and the stator core of the stator assembly. The width of the air gap along the radial direction of the stator impeller is 0.4~0.6mm.

[0007] In one embodiment of the present invention, a plurality of support members are further included. The plurality of support members are distributed along the axial direction at both ends of the stator assembly, and a second gap is provided between the support members and the stator assembly. The width of the second gap along the axial direction is 0.5~0.8mm.

[0008] In one embodiment of the present invention, the fixed impeller is further provided with a plurality of air guide plates arranged in a circular array along its circumference. The air guide plates are configured to be arc-shaped, connected to the guide vanes, and extend to the center of the fixed impeller.

[0009] In one embodiment of this utility model, the support member is an annular protrusion, the annular protrusion is coaxially arranged with the fixed impeller, the air guide plate extends to the annular protrusion, and the end of the air guide plate that contacts the annular protrusion is set lower than the annular protrusion.

[0010] In one embodiment of this utility model, it further includes a moving impeller and a wind shield sleeved outside the moving impeller. The wind shield is concave inward along the radial direction to form an annular step. The moving impeller is provided with a lower plate. A third gap is provided between the annular step and the edge of the lower plate. The width of the third gap along the radial direction is 0.4 to 0.8 mm.

[0011] In one embodiment of the present invention, the moving impeller further includes an upper plate, and a fourth gap is provided between the upper plate and the fixed impeller, the width of the fourth gap along the axial direction being 0.8 to 1.3 mm.

[0012] In one embodiment of this utility model, a fifth gap is provided between the edge of the upper piece and the inner wall of the hood, and the fifth gap is positioned directly opposite the air outlet.

[0013] In one embodiment of the present invention, the fixed impeller is further provided with a housing, a plurality of the guide vanes are located inside the housing, and the inner wall of the housing is welded to the guide vanes.

[0014] In one embodiment of the present invention, the fixed impeller further includes a circular base plate, which is disposed inside the housing, and the guide vanes are welded to the circular base plate.

[0015] In one embodiment of this utility model, the edge of the housing, the edge of the adjacent guide vane, and the edge of the circular substrate form the inlet of the housing air duct, and the area of ​​the fifth gap is larger than the area of ​​the inlet.

[0016] In one embodiment of this utility model, the first gap is in the same spiral direction as the guide vane.

[0017] In one embodiment of the present invention, the first gap is arranged radially inclined relative to the fixed impeller.

[0018] In one embodiment of this utility model, the first edge of the guide vane near the air outlet is radially inclined relative to the fixed impeller, and the second edge of the guide vane away from the air outlet is radially inclined relative to the fixed impeller. The angle between the first edge and the radial direction is smaller than the angle between the second edge and the radial direction. The first edge and the second edge form two edges of the gap along the circumferential direction.

[0019] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial effects:

[0020] The low-noise, high-efficiency fan of this invention features arc-shaped and inclined guide vanes that conform to the airflow trajectory, reducing flow separation and eddy current generation, and lowering resistance losses. As the airflow passes through the gradually narrowing gap, the flow velocity increases as the gap cross-sectional area decreases, improving the fan's working efficiency and reducing power consumption. The gradually narrowing gap width forms a "trumpet-shaped" acceleration path, allowing the airflow to reach the stator assembly at maximum velocity near the center of the impeller, significantly reducing the temperature of the stator assembly during operation. Attached Figure Description

[0021] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the structure of a low-noise, high-efficiency fan in a preferred embodiment of the present invention;

[0023] Figure 2 for Figure 1 The diagram shows a structural schematic of a low-noise, high-efficiency fan along a cross-section AA.

[0024] Figure 3 for Figure 2 The diagram shows the axial structure of the fixed impeller.

[0025] Figure 4 for Figure 3 The diagram shows the structure of the fixed impeller.

[0026] Figure 5 for Figure 4 Another schematic diagram of the fixed impeller is shown.

[0027] Explanation of reference numerals in the accompanying drawings: 1. Stator impeller; 11. Guide vane; 11a. First guide vane; 111a. First edge; 11b. Second guide vane; 111b. Second edge; 13. Air duct in the casing; 14. First gap; 15. First support member; 16. Base plate; 161. Bearing hole; 17. Inlet; 18. Air outlet; 19. Air guide plate; 2. Housing; 3. Magnet; 31. Rotating shaft; 4. Second support member; 5. Air shroud; 51. Annular step; 6. Blade; 61. Upper blade; 62. Lower blade; 63. Fifth gap; 64. Air inlet; 65. Third gap; 66. Fourth gap; 7. Stator assembly; 71. Second gap; 72. Stator core; 73. Air gap. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0029] Reference Figure 1 and Figure 3 As shown, in one embodiment of this utility model, a low-noise, high-efficiency fan is disclosed, comprising:

[0030] A fixed impeller 1 has multiple guide vanes 11 inside, which are arranged in a circumferential ring array along the fixed impeller 1. A casing air duct 13 is provided between adjacent guide vanes 11. The guide vanes 11 are arc-shaped and inclined towards the center of the fixed impeller 1. Adjacent guide vanes 11 are spaced apart along the circumference of the fixed impeller 1, forming a first gap 14 between them. The first gap 14 passes through the inlet 17 of the casing air duct 13 along the axial direction of the fixed impeller 1, and the width of the projection of the first gap 14 along the axial direction gradually decreases from the edge of the fixed impeller 1 towards the center of the fixed impeller 1.

[0031] In this embodiment, the low-noise, high-efficiency fan has a first gap 14 whose width gradually narrows from the edge of the impeller 1 towards its center, forming a casing duct 13 with an inlet larger than the outlet. After the fan starts, air enters the casing duct 13 from the air inlet 64. The air is rapidly compressed by the adjacent guide vanes 11 within the casing duct 13, and is accelerated for the first time. As the air passes through the gradually narrowing first gap 14, the pressure is converted into the kinetic energy of the air, and the air velocity increases as the cross-sectional area of ​​the first gap 14 decreases. The air is accelerated for the second time and is ejected from the air outlet 18 of the impeller, thereby improving the working efficiency of the fan and reducing power consumption. As the width of the first gap 14 gradually narrows, the air blows towards the stator assembly 7 at the maximum flow rate near the center of the impeller 1, significantly reducing the operating temperature of the stator assembly 7.

[0032] Reference Figure 2 As shown, in one embodiment of this utility model, it further includes a rotor assembly and a stator assembly 7 sleeved outside the rotor assembly. The rotor assembly includes a rotating shaft 31 and a magnet 3 connected to the rotating shaft 31. When current flows through the windings in the stator assembly 7, a rotating magnetic field is generated. The rotating magnetic field interacts with the rotor assembly, driving the rotor assembly to rotate. An air gap 73 is provided between the magnet 3 of the rotor assembly and the stator core 72 of the stator assembly 7. After the fan is started, the rotor assembly drives the impeller (described below) to rotate. A negative pressure is created at the air inlet 64, and air is drawn into the air inlet 64 and enters the stator impeller 1 through the inlet 17. Part of the air is ejected from the air outlet 18, and part of the air enters the stator assembly 7, for example, into the air gap 73 to dissipate heat from the stator assembly 7. The width of the air gap 73 along the radial direction of the stator impeller 1 is 0.4~0.6mm. When the width of the air gap 73 is within this range, the magnetic field density can be effectively increased, thereby improving the working efficiency of the fan. In this embodiment, the width of the air gap 73 is preferably 0.5mm.

[0033] In one embodiment of this utility model, the magnet 3 is preferably a permanent magnet.

[0034] Reference Figure 2 As shown, in one embodiment of this utility model, a support member is further included. Specifically, the support member includes a first support member 15 and a second support member 4. The first support member 15 and the second support member 4 are distributed along the axial direction at both ends of the stator assembly 7. The first support member 15 and the second support member 4 are used to support the stator assembly 7 and reduce frictional losses caused by rotor assembly eccentricity. A second gap 71 is provided between the first support member 15 and the stator assembly 7, and between the second support member 4 and the stator assembly 7. The width of the second gap 71 along the axial direction is 0.5~0.8mm. When the width of the second gap 71 is within this range, the noise caused by resonance between the first support member 15, the second support member 4 and the stator assembly 7 can be effectively reduced. In this embodiment, the width of the air gap 73 is preferably 0.6mm.

[0035] Reference Figure 4 As shown, in one embodiment of this utility model, the stator impeller 1 is further provided with a plurality of air guide plates 19 arranged in a circular array along its circumference. The air guide plates 19 are set in an arc shape to guide a portion of the air in the casing air duct 13. The air guide plates 19 and the guide vanes 11 are arranged in a one-to-one correspondence. One air guide plate 19 is welded to one guide vane 11. An air channel is provided between adjacent air guide plates 19. The inlet 17, the casing air duct 13 and the air channel together form an air circulation channel. The air guide plates 19 extend to the center of the stator impeller 1, which can accurately guide a portion of the air in the casing air duct 13 into the center of the stator impeller 1 to dissipate heat from the stator assembly 7.

[0036] Reference Figure 4 As shown, in one embodiment of this utility model, the support member is an annular protrusion, which is coaxially arranged with the fixed impeller 1. The air guide plate 19 extends to the annular protrusion, and the end of the air guide plate 19 that contacts the annular protrusion is set lower than the annular protrusion. The low position of the end of the air guide plate 19 reduces the collision between the air and the annular protrusion and reduces eddy noise.

[0037] Reference Figure 2 As shown, in one embodiment of this utility model, it further includes a moving impeller and a shroud 5 sleeved on the moving impeller. The shroud 5 has an air inlet 64. The shroud 5 is concave inward along the radial direction to form several annular steps 51. The moving impeller has a lower plate 62. A third gap 65 is provided between the edge of the annular steps 51 and the lower plate 62. The rotating shaft 31 is connected to the moving impeller. When the rotating shaft 31 drives the moving impeller to rotate, a negative pressure is formed at the air inlet 64, and air is drawn into the shroud 5. The air enters the inlet 17 after passing through the fifth gap 63 mentioned below. The width of the third gap 65 along the radial direction is 0.4 to 0.8 mm. When the width of the third gap 65 is within this range, it can ensure that the air drawn into the shroud 5 can flow into the inlet 17 and the air duct 13 of the casing as much as possible, reducing the air loss caused by air backflow. In this embodiment, the width of the third gap 65 is preferably set to 0.6 mm.

[0038] Reference Figure 2 As shown, in one embodiment of this utility model, the moving impeller further includes blades 6 and an upper plate 61. The upper plate 61 and the lower plate 62 are arranged in parallel and are both coaxial with the fixed impeller 1. The blades 6 are connected between the upper plate 61 and the lower plate 62. A fourth gap 66 is provided between the upper plate 61 and the fixed impeller 1. The width of the fourth gap 66 along the axial direction is 0.8 to 1.3 mm. When the width of the fourth gap 66 is within this range, the fixed impeller 1 and the moving impeller do not interfere with each other, and the noise of the fan can also be reduced. In this embodiment, the width of the fourth gap 66 is preferably set to 1 mm.

[0039] Reference Figure 2 As shown, in one embodiment of the present invention, a fifth gap 63 is provided between the edge of the upper piece 61 and the inner wall of the wind hood 5. The fifth gap 63 is positioned directly opposite the inlet 17, and the air inside the wind hood 5 enters the inlet 17 through the fifth gap 63.

[0040] Reference Figure 2 As shown, in one embodiment of the present invention, the fixed impeller 1 is further provided with a housing 2, the housing 2 is cylindrical and coaxially connected with the wind shield 5, a plurality of the guide vanes 11 are located on the inner side of the housing 2, and the inner wall of the housing 2 is welded to the guide vanes 11.

[0041] Reference Figure 5 As shown, in one embodiment of the present invention, the fixed impeller 1 further includes a circular base plate 16, which is disposed in the housing 2. The guide vane 11 is welded to the circular base plate 16, and the air guide plate 19 is welded on the circular base plate 16. The center of the base plate 16 is provided with a bearing hole 161 for mounting a bearing, and the rotating shaft 31 passes through the bearing hole 161.

[0042] Reference Figure 2 As shown, in one embodiment of this utility model, the edge of the housing 2, the edge of the adjacent first guide vane 11a and the edge of the second guide vane 11b, and the edge of the circular substrate 16 form the inlet 17 of the housing air duct. The area of ​​the fifth gap 63 is larger than the area of ​​the inlet 17. The large cross-sectional area of ​​the third gap 65 can guide more air into the inlet 17 and the housing air duct 13, thereby increasing the airflow rate.

[0043] Reference Figure 2 As shown, in one embodiment of the present invention, both the stator assembly 7 and the rotor assembly are located in the housing 2, and the gap between the inner wall of the housing 2 and the stator assembly 7 forms an air outlet 18.

[0044] Reference Figure 3 As shown, in one embodiment of this utility model, multiple guide vanes 11 and multiple first gaps 14 are spirally distributed, and the first gaps 14 are in the same spiral direction as the guide vanes 11, which can reduce airflow resistance and energy loss.

[0045] Reference Figure 3 As shown, in one embodiment of the present invention, the first gap 14 is radially inclined relative to the fixed impeller 1. Compared with the first gap 14 whose length direction is consistent with the radial direction, the length of the first gap 14 is extended, thereby extending the airflow acceleration distance and improving the kinetic energy conversion efficiency.

[0046] Reference Figure 3 As shown, in one embodiment of this utility model, on the projection of the fixed impeller 1 along the axial direction, the first edge 111a of the guide vane 11 near the inlet 17 is radially inclined relative to the fixed impeller 1, and the second edge 111b of the guide vane 11 away from the inlet 17 is radially inclined relative to the fixed impeller 1. For example, the first edge 111a of the first guide vane 11a and the second edge 111b of the second guide vane 11b are the two edges of the first gap 14 along the circumferential direction. The angle between the first edge 111a and the radial direction is smaller than the angle between the second edge 111b and the radial direction. Therefore, the width of the first gap 14 gradually narrows from the edge of the fixed impeller 1 towards the center.

[0047] In one embodiment of this utility model, the stator impeller 1 is made of plastic. Since the temperature of the stator assembly 7 rises slowly, the plastic stator impeller 1 can reduce the cost and weight of the fan.

[0048] The working principle of the low-noise, high-efficiency fan described in this utility model is as follows:

[0049] When the stator assembly 7 is powered on, it generates a rotating magnetic field, which drives the rotor assembly to rotate. The rotating shaft 31 of the rotor assembly drives the impeller to rotate. The air inlet 64 generates negative pressure to draw air into the shroud 5. After passing through the fifth gap 63, the air enters the inlet 17 and the casing air duct 13 and is compressed and accelerated by the guide vanes 11. Part of the air is ejected from the air outlet 18, and the other part of the air is blown towards the stator assembly 7 through the casing air duct 13 and the first gap 14 to dissipate heat from the stator assembly 7.

[0050] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A low-noise, high-efficiency fan, characterized in that, include, A fixed impeller has multiple guide vanes inside, which are arranged in a circumferential ring array along the fixed impeller. A casing air duct is provided between adjacent guide vanes. The guide vanes are arc-shaped and inclined towards the center of the fixed impeller. Adjacent guide vanes are spaced apart along the circumference of the fixed impeller, forming a first gap between them. The first gap extends through the inlet of the casing air duct along the axial direction of the fixed impeller, and the width of the projection of the first gap along the axial direction gradually decreases from the edge of the fixed impeller to the center of the fixed impeller.

2. The low-noise, high-efficiency fan according to claim 1, characterized in that, It also includes a rotor assembly and a stator assembly sleeved outside the rotor assembly. An air gap is provided between the magnet of the rotor assembly and the stator core of the stator assembly. The width of the air gap along the radial direction of the stator impeller is 0.4~0.6mm.

3. The low-noise, high-efficiency fan according to claim 2, characterized in that, It also includes multiple support members, which are distributed along the axial direction at both ends of the stator assembly, and a second gap is provided between the support members and the stator assembly, the width of the second gap along the axial direction being 0.5~0.8mm.

4. A low-noise, high-efficiency fan according to claim 3, characterized in that, The fixed impeller is also provided with a plurality of air guide plates arranged in a circular array along its circumference. The air guide plates are configured to be arc-shaped, connected to the guide vanes, and extend to the center of the fixed impeller.

5. A low-noise, high-efficiency fan according to claim 4, characterized in that, The support member is an annular protrusion, which is coaxially arranged with the fixed impeller. The air guide plate extends to the annular protrusion, and the end of the air guide plate that contacts the annular protrusion is set lower than the annular protrusion.

6. A low-noise, high-efficiency fan according to claim 1, characterized in that, It also includes a moving impeller and a shroud fitted over the moving impeller. The shroud is concave inward along the radial direction of the fixed impeller to form an annular step. The moving impeller is provided with a lower plate. A third gap is provided between the annular step and the edge of the lower plate. The width of the third gap along the radial direction is 0.4 to 0.8 mm.

7. A low-noise, high-efficiency fan according to claim 6, characterized in that, The moving impeller also includes an upper plate, and a fourth gap is provided between the upper plate and the fixed impeller. The width of the fourth gap along the axial direction is 0.8 to 1.3 mm.

8. A low-noise, high-efficiency fan according to claim 7, characterized in that, A fifth gap is provided between the edge of the upper plate and the inner wall of the shroud, and the area of ​​the fifth gap is larger than the area of ​​the inlet of the air duct of the housing.

9. A low-noise, high-efficiency fan according to claim 1, characterized in that, The first gap is in the same direction as the spiral of the guide vane.

10. A low-noise, high-efficiency fan according to claim 1, characterized in that, The first gap is arranged at a radial angle relative to the fixed impeller.

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