Centrifugal fan and electronic device

Abstract

This application provides a centrifugal fan and electronic device, relating to the field of fan technology. The centrifugal fan provided by this application includes: a volute housing, including an air inlet surface along its own axial direction; fan blades disposed within the volute housing; a first air outlet located on a first sidewall in the radial direction of the volute housing; and an air inlet located on the air inlet surface and directly opposite the fan blades. The edge of the air inlet is constructed as an annular inclined surface formed by splicing multiple arc-shaped inclined surfaces. At least two of the multiple arc-shaped inclined surfaces have different inclination angles. The multiple arc-shaped inclined surfaces include a first arc-shaped inclined surface, which corresponds to the first air outlet along the radial direction of the fan blades. The inclination angle of the first arc-shaped inclined surface is greater than or equal to 120° and less than or equal to 130°, and the inclination angle is the angle between the arc-shaped inclined surface and the air inlet surface. This application provides a centrifugal fan and electronic device that can improve air intake efficiency and reduce noise.

Description

Technical Field

[0001] This application relates to the field of fan technology, and more particularly to a centrifugal fan and electronic device. Background Technology

[0002] Centrifugal fans, as core components of ventilation and heat dissipation equipment, are widely used in home appliances, industrial equipment, and electronic device heat dissipation. Their airflow guidance performance, noise level, and ventilation efficiency directly affect the overall performance and heat dissipation of the equipment. When a centrifugal fan is working, the air velocity varies at different locations in the air inlet. Existing air inlet structures cannot accommodate this velocity difference, causing airflow separation or vortices to easily form as it passes through the edge of the air inlet, reducing air intake efficiency and increasing noise. Summary of the Invention

[0003] To address at least one of the problems mentioned in the background art, this application provides a centrifugal fan and electronic device that can improve air intake efficiency and reduce noise.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] This application provides a centrifugal fan, comprising:

[0006] The volute includes the air intake surface along its own axial direction;

[0007] The fan blades are housed within the volute.

[0008] The first air outlet is located on the first radial side wall of the volute.

[0009] An air inlet is located on the air intake surface and faces the fan blade. The edge of the air inlet is constructed as an annular slope formed by splicing multiple arc-shaped slopes. At least two of the multiple arc-shaped slopes have different inclination angles. The multiple arc-shaped slopes include a first arc-shaped slope, which corresponds to the first air outlet along the radial direction of the fan blade. The first arc-shaped slope has a first end and a second end along the thickness direction of the volute. The first end is inclined toward the center of the fan blade relative to the second end.

[0010] As an optional implementation, it also includes a second air outlet, which is located on the second sidewall of the volute in the radial direction. The plurality of arc-shaped inclined surfaces also include a second arc-shaped inclined surface, which is located in the radial direction of the fan blade and corresponds to the second air outlet. The inclination angle of the first arc-shaped inclined surface is greater than or equal to 120° and less than or equal to 130°, and the inclination angle of the second arc-shaped inclined surface is greater than or equal to 120° and less than or equal to 130°. The inclination angle is the angle between the arc-shaped inclined surface and the air inlet surface.

[0011] As an optional implementation, the volute also has a flow divider on its radial side, which is located between the first air outlet and the second air outlet. The multiple arc-shaped inclined surfaces also include a third arc-shaped inclined surface, which corresponds to the flow divider along the radial direction of the fan blade. The inclination angle of the third arc-shaped inclined surface is greater than or equal to 135° and less than or equal to 140°.

[0012] As an optional implementation, the plurality of arc-shaped inclined surfaces also includes a fourth arc-shaped inclined surface, which is adjacent to the first arc-shaped inclined surface. The inclination angle of the fourth arc-shaped inclined surface is greater than or equal to 135° and less than or equal to 140°, and the central angle of the fan blade corresponding to the fourth arc-shaped inclined surface is greater than or equal to 65° and less than or equal to 75°.

[0013] As an optional implementation, the plurality of arc-shaped inclined surfaces also includes a fifth arc-shaped inclined surface, which is adjacent to the fourth arc-shaped inclined surface. The inclination angle of the fifth arc-shaped inclined surface is greater than or equal to 150° and less than or equal to 160°, and the central angle of the fifth arc-shaped inclined surface corresponding to the fan blade is greater than or equal to 85° and less than or equal to 95°.

[0014] As an optional implementation, the plurality of arc-shaped inclined surfaces also includes a sixth arc-shaped inclined surface, which is adjacent to the fifth and second arc-shaped inclined surfaces. The inclination angle of the sixth arc-shaped inclined surface is greater than or equal to 130° and less than or equal to 140°. The central angle of the fan blade corresponding to the sixth arc-shaped inclined surface is greater than or equal to 70° and less than or equal to 80°. The first, third, second, sixth, fifth, and fourth arc-shaped inclined surfaces are sequentially spliced ​​together to form an annular inclined surface.

[0015] As an optional implementation, the central angle of the first arc-shaped inclined surface corresponding to the fan blade is greater than or equal to 55° and less than or equal to 65°, the central angle of the second arc-shaped inclined surface corresponding to the fan blade is greater than or equal to 40° and less than or equal to 50°, and the central angle of the third arc-shaped inclined surface corresponding to the fan blade is greater than or equal to 15° and less than or equal to 25°.

[0016] As an optional implementation, the width of the curved slope is greater than 0.3 mm.

[0017] As an optional implementation, the edge of the first air outlet has a chamfer or a rounded corner, and / or the edge of the second air outlet has a chamfer or a rounded corner, wherein the degree of the chamfer is greater than or equal to 120° and less than or equal to 170°, and the radius of curvature of the rounded corner is greater than or equal to 0.3mm.

[0018] Secondly, this application also provides an electronic device, including the centrifugal fan described in the second aspect.

[0019] The centrifugal fan provided in this application constructs the edge of the air inlet into an annular slope formed by splicing multiple arc-shaped slopes with different inclination angles. This adapts to the air velocity differences at different positions of the air inlet. Since the first air outlet is a position with higher wind speed, the wind speed is correspondingly higher at the position of the first arc-shaped slope corresponding to the first air outlet. This inclination angle can ensure that as much high-speed airflow as possible enters from the first arc-shaped slope, reducing flow resistance, increasing the air intake volume of the fan, and avoiding separation or vortex when the airflow passes through the edge of the air inlet, thereby improving air intake efficiency and reducing noise. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a first structure of a centrifugal fan provided in an embodiment of this application;

[0022] Figure 2 This is a schematic diagram of a second structure of a centrifugal fan provided in an embodiment of this application.

[0023] Explanation of reference numerals in the attached figures:

[0024] 100 Centrifugal fan; 110 Volute; 120 Fan blade; 130 First air outlet; 140 Air inlet; 150 First curved slope; 160 Second air outlet; 170 Flow divider; 180 Second curved slope; 190 Third curved slope; 200 Fourth curved slope; 210 Fifth curved slope; 220 Sixth curved slope; 230 Chamfer. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] In this application, the terms “upper,” “lower,” “left,” “right,” “front,” “back,” “top,” “bottom,” “inner,” “outer,” “vertical,” “horizontal,” “lateral,” and “longitudinal” indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0027] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0028] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0029] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0030] Centrifugal fans, as core components of ventilation and heat dissipation equipment, are widely used in home appliances, industrial equipment, and electronic device heat dissipation. Their airflow guidance performance, noise level, and ventilation efficiency directly affect the overall performance and heat dissipation of the equipment. When a centrifugal fan is working, the air velocity varies at different locations in the air inlet. Existing air inlet structures cannot accommodate this velocity difference, causing airflow separation or vortices to easily form as it passes through the edge of the air inlet, reducing air intake efficiency and increasing noise.

[0031] In view of this, this application provides a centrifugal fan, which constructs the edge of the air inlet as an annular slope formed by splicing multiple arc-shaped slopes with different inclination angles to adapt to the air velocity differences at different positions of the air inlet. At the same time, the inclination angle of the first arc-shaped slope corresponding to the first air outlet along the radial direction of the fan blade is set to be greater than or equal to 120° and less than or equal to 130° (the inclination angle is the angle between the arc-shaped slope and the air inlet surface). Since the first air outlet is a position with higher wind speed, the wind speed is correspondingly higher at the position of the first arc-shaped slope corresponding to the first air outlet in the radial direction of the fan blade. This inclination angle can ensure that as much high-speed airflow as possible enters from the first arc-shaped slope, reducing flow resistance, increasing the air intake volume of the fan, and avoiding separation or vortex when the airflow passes through the edge of the air inlet, thereby improving air intake efficiency and reducing noise.

[0032] Figure 1 This is a schematic diagram of a first structure of a centrifugal fan provided in an embodiment of this application; Figure 2 This is a schematic diagram of a second structure of a centrifugal fan provided in an embodiment of this application.

[0033] You can refer to this. Figure 1 and Figure 2 This application provides a centrifugal fan 100, comprising:

[0034] The volute 110 includes an air intake surface along its own axial direction;

[0035] Fan blade 120 is disposed inside volute 110;

[0036] The first air outlet 130 is located on the first radial side wall of the volute 110;

[0037] The air inlet 140 is located on the air intake surface and is directly opposite the fan blade 120. The edge of the air inlet 140 is constructed as an annular slope formed by splicing multiple arc-shaped slopes. At least two of the multiple arc-shaped slopes have different inclination angles. The multiple arc-shaped slopes include a first arc-shaped slope 150, which corresponds to the first air outlet 130 along the radial direction of the fan blade 120. The first arc-shaped slope 150 has a first end and a second end along the thickness direction of the volute 110 shell. The first end is inclined toward the center direction of the fan blade 120 relative to the second end.

[0038] The centrifugal fan 100 provided in this application embodiment constructs the edge of the air inlet 140 as an annular slope formed by splicing multiple arc-shaped slopes with different inclination angles, adapting to the airflow velocity differences at different positions of the air inlet 140. Since the first air outlet 130 is a position with higher wind speed, the radial position of the fan blade 120 corresponding to the first arc-shaped slope 150 of the first air outlet 130 has a correspondingly higher wind speed. This inclination angle can ensure that as much high-speed airflow as possible enters from the first arc-shaped slope 150, reducing flow resistance, increasing the air intake volume of the fan, and avoiding separation or vortex when the airflow passes through the edge of the air inlet 140, thereby improving air intake efficiency and reducing noise.

[0039] In the above embodiments, a second air outlet 160 may also be included. The second air outlet 160 is located on the second sidewall of the volute 110 in the radial direction. The plurality of arc-shaped inclined surfaces also include a second arc-shaped inclined surface 180. The second arc-shaped inclined surface 180 is located in the radial direction of the fan blade 120 and corresponds to the second air outlet 160. The inclination angle of the first arc-shaped inclined surface 150 is greater than or equal to 120° and less than or equal to 130°, and the inclination angle of the second arc-shaped inclined surface 180 is greater than or equal to 120° and less than or equal to 130°. The inclination angle is the angle between the arc-shaped inclined surface and the air inlet surface. By setting the tilt angle of the second arc-shaped inclined surface 180, which corresponds to the second air outlet 160 in the radial direction of the fan blade 120, to be greater than or equal to 120° and less than or equal to 130°, the second air outlet 160 is a position with a high airflow velocity on the radial second side wall of the volute 110. The airflow velocity at the corresponding position of the second arc-shaped inclined surface 180 is also high. This tilt angle can adapt to the high-speed airflow characteristics of this area and guide more high-speed airflow to enter smoothly. If the tilt angle of the second arc-shaped inclined surface 180 is too small, it will result in insufficient guidance for airflow entry, which will not be able to effectively guide high-speed airflow into the air, resulting in a reduction in airflow volume and airflow efficiency. At the same time, it is easy to cause airflow separation and generate additional aerodynamic noise. If the tilt angle is too large, it will disrupt the smooth flow of airflow, leading to an aggravation of vortex phenomenon, which will not only increase energy loss, but also significantly increase the noise level and reduce the overall ventilation efficiency.

[0040] In the above embodiments, the volute 110 may also have a diverter plate 170 on its radial side, the diverter plate 170 being located between the first air outlet 130 and the second air outlet 160. The plurality of arc-shaped inclined surfaces also include a third arc-shaped inclined surface 190, the third arc-shaped inclined surface 190 being radially opposite to the diverter plate 170 along the fan blade 120, and the inclination angle of the third arc-shaped inclined surface 190 being greater than or equal to 135° and less than or equal to 140°. By setting the inclination angle of the third arc-shaped inclined surface 190 corresponding to the splitter plate 170 in the radial direction of the fan blade 120 to be greater than or equal to 135° and less than or equal to 140°, the splitter plate 170 is located between the first air outlet 130 and the second air outlet 160 in the radial direction of the volute 110. The airflow velocity in this area is lower than that in the air outlet area. The inclination angle of the third arc-shaped inclined surface 190 is adapted to the airflow characteristics of the corresponding area of ​​the splitter plate 170, guiding the airflow to enter smoothly. If the inclination angle of the third arc-shaped inclined surface 190 is too small, it will result in insufficient airflow guidance and will not be able to match the splitter plate 170. The airflow velocity characteristics of the area can easily cause airflow separation, increasing aerodynamic noise and reducing effective air intake, thus lowering air intake efficiency. If the tilt angle is too large, it will disrupt the smooth flow of airflow, forming obvious vortices in the area corresponding to the splitter plate 170, exacerbating the degree of airflow turbulence, increasing the energy loss of airflow movement, not only increasing the level of aerodynamic noise, but also further reducing the ventilation efficiency and heat dissipation performance of the fan. At the same time, the unbalanced airflow guidance will disrupt the overall airflow balance distribution inside the volute 110, affecting the stability of fan operation and exacerbating the airflow impact between components.

[0041] In the above embodiments, the plurality of arc-shaped inclined surfaces may further include a fourth arc-shaped inclined surface 200, the fourth arc-shaped inclined surface 200 and the first arc-shaped inclined surface 150 being adjacent to each other, the inclination angle of the fourth arc-shaped inclined surface 200 being greater than or equal to 135° and less than or equal to 140°, and the central angle (angle A) of the fan blade 120 corresponding to the fourth arc-shaped inclined surface 200 being greater than or equal to 65° and less than or equal to 75°. It can be understood that the first arc-shaped inclined surface 150 corresponds to the high-speed airflow region of the first air outlet 130 radially from the volute 110, and the fourth arc-shaped inclined surface 200 is adjacent to this high-speed airflow region, with the gas flow velocity exhibiting a transition from high speed to medium speed. By setting the tilt angle of the fourth arc-shaped inclined surface 200 to be greater than or equal to 135° and less than or equal to 140°, and the corresponding central angle of the fan blade 120 to be greater than or equal to 65° and less than or equal to 75°, the flow velocity and airflow characteristics of this region are adapted, guiding the airflow to enter smoothly, avoiding airflow turbulence and reducing aerodynamic noise, while ensuring a smooth connection with the first arc-shaped inclined surface 150, improving the continuity of the air intake path, and reducing energy loss; if the tilt angle of the fourth arc-shaped inclined surface 200 is too small, Ineffective guidance of airflow in the transition area will exacerbate airflow separation, increase aerodynamic noise, and reduce intake efficiency. If the tilt angle is too large, it will disrupt the airflow state, induce eddies, increase airflow energy loss, significantly increase noise levels, and reduce ventilation efficiency. If the central angle of the fourth arc-shaped inclined surface 200 corresponding to the fan blade 120 is less than 65°, the effective range of the arc-shaped inclined surface will be insufficient to cover the airflow in the transition area, and sudden airflow changes are likely to occur at the junction, causing local turbulence. If the central angle is greater than 75°, the inclined surface will cover too much, compressing the airflow guidance space in adjacent areas, disrupting the overall airflow distribution balance, increasing airflow interference, and reducing the stability and ventilation efficiency of the fan operation.

[0042] In the above embodiments, the plurality of arc-shaped inclined surfaces may further include a fifth arc-shaped inclined surface 210, the fifth arc-shaped inclined surface 210 and the fourth arc-shaped inclined surface 200 being adjacent to each other, the inclination angle of the fifth arc-shaped inclined surface 210 being greater than or equal to 150° and less than or equal to 160°, and the central angle (angle B) of the fan blade 120 corresponding to the fifth arc-shaped inclined surface 210 being greater than or equal to 85° and less than or equal to 95°. The fifth arc-shaped inclined surface 210 is adjacent to the fourth arc-shaped inclined surface 200. Following the fourth arc-shaped inclined surface 200, which is close to the high-speed airflow zone of the first air outlet 130, the gas velocity in this area further decreases, exhibiting low-velocity characteristics. By setting the tilt angle of the fifth arc-shaped inclined surface 210 to be greater than or equal to 150° and less than or equal to 160°, and the corresponding central angle of the fan blade 120 to be greater than or equal to 85° and less than or equal to 95°, it adapts to the decreasing velocity and airflow movement state in this area, guiding the airflow to enter smoothly, avoiding turbulent phenomena such as airflow separation and eddies, reducing aerodynamic noise, and ensuring a smooth connection with the fourth arc-shaped inclined surface 200, guaranteeing the continuity of the air intake path and reducing energy loss; if the tilt angle of the fifth arc-shaped inclined surface 210 is... If the angle is less than 150°, it cannot effectively adapt to the airflow characteristics of the area, resulting in insufficient airflow guidance, exacerbating airflow turbulence, increasing aerodynamic noise, and reducing air intake efficiency. If the tilt angle is greater than 160°, it will disrupt the smooth flow of airflow, intensify eddies, significantly increase air energy loss, increase noise levels, and reduce ventilation efficiency. If the central angle of the fifth arc-shaped inclined surface 210 corresponding to the fan blade 120 is less than 85°, it will result in insufficient effective range, and sudden airflow changes are likely to occur at the junction, causing local turbulence. If the central angle is greater than 95°, it will cause the inclined surface to cover too large an area, compressing the airflow guidance space of adjacent areas, disrupting the overall airflow distribution balance, increasing airflow interference, and reducing the stability of fan operation and ventilation efficiency.

[0043] In the above embodiments, the plurality of arc-shaped inclined surfaces may further include a sixth arc-shaped inclined surface 220, which is adjacent to the fifth arc-shaped inclined surface 210 and the second arc-shaped inclined surface 180. The inclination angle of the sixth arc-shaped inclined surface 220 is greater than or equal to 130° and less than or equal to 140°. The central angle (angle C) of the fan blade 120 corresponding to the sixth arc-shaped inclined surface 220 is greater than or equal to 70° and less than or equal to 80°. The first arc-shaped inclined surface 150, the third arc-shaped inclined surface 190, the second arc-shaped inclined surface 180, the sixth arc-shaped inclined surface 220, the fifth arc-shaped inclined surface 210 and the fourth arc-shaped inclined surface 200 are sequentially spliced ​​to form an annular inclined surface.

[0044] The sixth arc-shaped inclined surface 220 is adjacent to the fifth arc-shaped inclined surface 210 and the second arc-shaped inclined surface 180. The second arc-shaped inclined surface 180 corresponds to the high-speed airflow zone of the second air outlet 160, while the fifth arc-shaped inclined surface 210 is in a low-speed zone. Therefore, the gas flow velocity of the sixth arc-shaped inclined surface 220 is in the high-low speed transition zone. By setting the tilt angle of the sixth arc-shaped inclined surface 220 to be greater than or equal to 130° and less than or equal to 140°, and the corresponding central angle of the fan blade 120 to be greater than or equal to 70° and less than or equal to 80°, it adapts to the medium-speed airflow characteristics of this zone, guides the airflow to enter smoothly, avoids turbulent phenomena such as airflow separation and eddies, reduces aerodynamic noise, and ensures a smooth connection with the fifth arc-shaped inclined surface 210 and the second arc-shaped inclined surface 180, ensuring the continuity of the overall airflow transition of the annular inclined surface and reducing energy consumption. Energy loss; if the tilt angle of the sixth arc-shaped inclined surface 220 is less than 130°, it cannot effectively adapt to the airflow characteristics of the area, which will lead to insufficient airflow guidance, aggravate airflow turbulence, increase aerodynamic noise and reduce air intake efficiency. If the tilt angle is greater than 140°, it will disrupt the smooth flow of airflow, cause vortex aggravation, significantly increase air energy loss, increase noise level and reduce ventilation efficiency. If the central angle of the sixth arc-shaped inclined surface 220 corresponding to the fan blade 120 is less than 70°, it will result in insufficient effective range, and sudden airflow changes are likely to occur at the junction, causing local turbulence. If the central angle is greater than 80°, it will cause the inclined surface to cover too large an area, squeeze the airflow guidance space of adjacent areas, disrupt the overall airflow distribution balance, increase airflow interference, and reduce the stability of fan operation and ventilation efficiency.

[0045] The annular slope formed by the sequential splicing of the first arc-shaped slope 150, the third arc-shaped slope 190, the second arc-shaped slope 180, the sixth arc-shaped slope 220, the fifth arc-shaped slope 210, and the fourth arc-shaped slope 200 achieves precise adaptation of airflow across the entire edge of the air inlet 140 by differentiating the tilt angles and central angles of each arc-shaped slope, thus optimizing the overall airflow guidance effect.

[0046] In the above embodiments, the central angle (angle D) of the first arc-shaped inclined surface 150 corresponding to the fan blade 120 can be greater than or equal to 55° and less than or equal to 65°, the central angle (angle E) of the second arc-shaped inclined surface 180 corresponding to the fan blade 120 can be greater than or equal to 40° and less than or equal to 50°, and the central angle (angle F) of the third arc-shaped inclined surface 190 corresponding to the fan blade 120 can be greater than or equal to 15° and less than or equal to 25°. It is understandable that if the central angle of the first curved slope 150 corresponding to the fan blade 120 is too large, it means that the range of the first air outlet 130 is too large, and the airflow is not sufficiently guided and constrained at the first air outlet 130. This can easily lead to uncontrolled airflow diffusion and energy dispersion, which not only reduces the accuracy of airflow guidance but also causes ineffective airflow loss outside the air outlet. If the central angle of the first curved slope 150 corresponding to the fan blade 120 is too small, it means that the range of the first air outlet 130 is excessively compressed, and the airflow space within the air outlet is insufficient. This can easily cause airflow congestion and increased disturbance, which not only increases aerodynamic noise but also reduces airflow efficiency and guidance integrity.

[0047] Similarly, if the central angle of the second curved slope 180° is too large, the range of the second air outlet 160° will be excessively enlarged, weakening the concentrated guiding effect of the airflow at the second air outlet 160°. This can easily lead to airflow dispersion and reduced energy utilization, which not only undermines the targeted guidance of the airflow but also causes the airflow to diffuse ineffectively outside the air outlet. If the central angle of the second curved slope 180° is too small, it means that the range of the second air outlet 160° is excessively compressed, obstructing the airflow path within the air outlet. This can easily cause airflow congestion and frequent disturbances, increasing aerodynamic noise and reducing the smoothness and guiding efficiency of airflow.

[0048] If the central angle of the third curved slope 190 is too large, it will result in insufficient coverage of the splitter plate 170, insufficient airflow splitting, and problems such as airflow turbulence and increased noise are likely to occur. If the central angle of the third curved slope 190 is too large, it will over-compress the airflow channel, causing airflow congestion. This will not only reduce the splitting efficiency, but also increase the airflow resistance and affect the stability of the overall airflow guidance.

[0049] If the central angle of the third curved slope is too small, the slope's coverage area will be insufficient, failing to cover the corresponding airflow area. Airflow breaks are likely to occur at the junction, causing discontinuous airflow guidance, leading to local airflow turbulence and increased noise. At the same time, the airflow guidance function is limited, reducing the integrity and effectiveness of airflow guidance.

[0050] In the above embodiments, the width of the curved surface can be greater than 0.3 mm. A width greater than 0.3 mm ensures an effective contact area for airflow guidance, avoiding problems such as airflow separation and increased turbulence caused by an insufficient contact area. It also reduces frictional losses between the splitter plate 170 and the airflow, thus reducing aerodynamic noise. If the width is less than or equal to 0.3 mm, the insufficient contact area will significantly reduce the flow guidance effect, increase the risk of airflow turbulence, and decrease operational stability and efficiency.

[0051] In the above embodiments, the edge of the first air outlet 130 may have a chamfer 230 or a rounded corner, and / or the edge of the second air outlet 160 may have a chamfer 230 or a rounded corner. The degree of the chamfer 230 is greater than or equal to 120° and less than or equal to 170°, and the radius of curvature of the rounded corner is greater than or equal to 0.3mm. By setting the chamfer 230, the airflow of the first and second air outlets 160 can be guided to transition smoothly, reducing airflow turbulence and aerodynamic noise at the edge of the air outlet. At the same time, it optimizes the structural stress distribution in the air outlet area and reduces equipment operating noise and energy consumption. If the chamfer 230 angle is too small, the airflow guidance of the first and second air outlets 160 will be poor, resulting in local airflow turbulence and increased turbulence. This will not only reduce the airflow guidance efficiency in the air outlet area but also increase equipment operating noise and energy loss. If the chamfer 230 angle is too large, it will excessively compress the airflow channels of the first and second air outlets, causing airflow congestion and increased flow resistance. This will not only increase equipment power consumption but also disrupt the airflow distribution balance in the air outlet area, leading to airflow separation and energy loss. In addition, by setting a chamfer 230, the air outlet efficiency can be appropriately increased without changing the overall structure of the first air outlet 130 and the second air outlet 160.

[0052] In particular, if the radius of curvature of the rounded corner is too small, it will prevent the formation of a smooth airflow transition surface at the edge of the air outlet. Airflow separation, eddies and turbulence are likely to occur at the edge, increasing the resistance and energy loss of airflow movement. This will not only reduce the effective air volume of the air outlet, but also aggravate the generation of aerodynamic noise. In addition, rounded corners with too small a radius of curvature will also have sharp parts at the edge of the structure. This will not only reduce the mechanical performance of the structure, but also easily cause stress concentration, increase the risk of structural deformation or damage. In the long term, the impact of airflow will aggravate edge wear, reducing the overall reliability and service life of the equipment.

[0053] In addition, this application also provides an electronic device, including the centrifugal fan 100 in the above embodiment. The centrifugal fan 100 adapts to the air velocity differences at different positions of the air inlet 140 by constructing the edge of the air inlet 140 as an annular slope formed by splicing multiple arc-shaped slopes with different inclination angles. Since the first air outlet 130 is a position with higher wind speed, the radial position of the fan blade 120 corresponding to the first arc-shaped slope 150 of the first air outlet 130 has a correspondingly higher wind speed. This inclination angle can ensure that as much high-speed airflow as possible enters from the first arc-shaped slope 150, reducing flow resistance, increasing the air intake volume of the fan, and avoiding separation or vortex when the airflow passes through the edge of the air inlet 140, thereby improving air intake efficiency, reducing noise, and improving the heat dissipation efficiency of the electronic device.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various implementations of this application.

Claims

1. A centrifugal fan, characterized in that, include: The volute (110) includes an air intake surface along its own axial direction; Fan blades (120) are disposed inside the volute (110); The first air outlet (130) is located on the first sidewall of the volute (110) in the radial direction; An air inlet (140) is located on the air inlet surface and is directly opposite the fan blade (120). The edge of the air inlet (140) is constructed as an annular slope formed by splicing multiple arc-shaped slopes. At least two of the multiple arc-shaped slopes have different inclination angles. The multiple arc-shaped slopes include a first arc-shaped slope (150). The first arc-shaped slope (150) corresponds to the first air outlet (130) along the radial direction of the fan blade (120). The first arc-shaped slope (150) has a first end and a second end along the thickness direction of the volute (110). The first end is inclined toward the center direction of the fan blade (120) relative to the second end.

2. The centrifugal fan according to claim 1, characterized in that, It also includes a second air outlet (160), which is located on the second sidewall of the volute (110) in the radial direction. The plurality of arc-shaped inclined surfaces also include a second arc-shaped inclined surface (180), which is located in the radial direction of the fan blade (120) and corresponds to the second air outlet (160). The first arc-shaped inclined surface (150) has an inclination angle greater than or equal to 120° and less than or equal to 130°, and the second arc-shaped inclined surface (180) has an inclination angle greater than or equal to 120° and less than or equal to 130°. The inclination angle is the angle between the arc-shaped inclined surface and the air inlet surface.

3. The centrifugal fan according to claim 2, characterized in that, The volute (110) also has a diverter plate (170) on its radial side, the diverter plate (170) being located between the first air outlet (130) and the second air outlet (160). The plurality of arc-shaped inclined surfaces also include a third arc-shaped inclined surface (190), the third arc-shaped inclined surface (190) being radially opposite to the diverter plate (170) of the fan blade (120), and the inclination angle of the third arc-shaped inclined surface (190) being greater than or equal to 135° and less than or equal to 140°.

4. The centrifugal fan according to claim 3, characterized in that, The plurality of the arc-shaped inclined surfaces also include a fourth arc-shaped inclined surface (200), which is adjacent to the first arc-shaped inclined surface (150). The inclination angle of the fourth arc-shaped inclined surface (200) is greater than or equal to 135° and less than or equal to 140°. The central angle of the fourth arc-shaped inclined surface (200) corresponding to the fan blade (120) is greater than or equal to 65° and less than or equal to 75°.

5. The centrifugal fan according to claim 4, characterized in that, The plurality of the arc-shaped inclined surfaces also include a fifth arc-shaped inclined surface (210), which is adjacent to the fourth arc-shaped inclined surface (200). The inclination angle of the fifth arc-shaped inclined surface (210) is greater than or equal to 150° and less than or equal to 160°. The central angle of the fifth arc-shaped inclined surface (210) corresponding to the fan blade (120) is greater than or equal to 85° and less than or equal to 95°.

6. The centrifugal fan according to claim 5, characterized in that, The plurality of arc-shaped inclined surfaces also include a sixth arc-shaped inclined surface (220), which is adjacent to the fifth arc-shaped inclined surface (210) and the second arc-shaped inclined surface (180). The inclination angle of the sixth arc-shaped inclined surface (220) is greater than or equal to 130° and less than or equal to 140°. The central angle of the sixth arc-shaped inclined surface (220) corresponding to the fan blade (120) is greater than or equal to 70° and less than or equal to 80°. The first arc-shaped inclined surface (150), the third arc-shaped inclined surface (190), the second arc-shaped inclined surface (180), the sixth arc-shaped inclined surface (220), the fifth arc-shaped inclined surface (210), and the fourth arc-shaped inclined surface (200) are sequentially spliced ​​together to form the annular inclined surface.

7. The centrifugal fan according to claim 6, characterized in that, The central angle of the first arc-shaped inclined surface (150) corresponding to the fan blade (120) is greater than or equal to 55° and less than or equal to 65°, the central angle of the second arc-shaped inclined surface (180) corresponding to the fan blade (120) is greater than or equal to 40° and less than or equal to 50°, and the central angle of the third arc-shaped inclined surface (190) corresponding to the fan blade (120) is greater than or equal to 15° and less than or equal to 25°.

8. The centrifugal fan according to any one of claims 1-7, characterized in that, The width of the curved slope is greater than 0.3 mm.

9. The centrifugal fan according to any one of claims 2-7, characterized in that, The first air outlet (130) has a chamfer or rounded edge, and / or the second air outlet (160) has a chamfer or rounded edge, wherein the degree of the chamfer is greater than or equal to 120° and less than or equal to 170°, and the radius of curvature of the rounded edge is greater than or equal to 0.3mm.

10. An electronic device, characterized in that, Includes the centrifugal fan as described in any one of claims 1 to 9.

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