Centrifugal fans and electronic equipment

Abstract

This disclosure discloses a centrifugal fan and an electronic device. The centrifugal fan includes: a fan blade having a hub and multiple blades, the blades being arranged in a ring around the hub; a reinforcing ring disposed on the blades; and a housing having an upper shell plate disposed on one side of the fan blade's axial direction. The upper shell plate has a support protrusion, the support protrusion protruding outward from the side opposite to the fan blade, and forming a recess on the side facing the fan blade, the recess being completely covered by the reinforcing ring along the fan blade's axial direction. This embodiment of the disclosure, by providing a support protrusion on the centrifugal fan's housing and aligning the recess on the inner side of the support protrusion with the reinforcing ring on the fan blade, can improve the centrifugal fan's pressure resistance while reducing the negative impact of the support protrusion structure on fan performance.

Description

Technical Field

[0001] This disclosure generally relates to the field of fan technology. More specifically, this disclosure relates to a centrifugal fan and electronic equipment. Background Technology

[0002] In the field of portable electronic device cooling, centrifugal fans are commonly used in conventional laptops and other electronic devices. To improve the pressure resistance of the centrifugal fan casing, some products currently employ a design with localized protrusions on the outer frame. However, while this structure can resist deformation of the casing during user operation, the recesses inside these protrusions disrupt the aerodynamic continuity of the flow channel surface, inducing turbulence and leading to increased aerodynamic noise. Simultaneously, the eddies and backflow disturbances formed within the cavity increase flow resistance, resulting in a double decrease in airflow and static pressure performance. These issues reduce the device's cooling performance, increase noise, and may even require higher speeds to compensate for performance losses, significantly reducing the overall performance of the device.

[0003] In view of this, there is an urgent need to provide a centrifugal fan and electronic equipment that can improve the centrifugal fan's pressure resistance while reducing the negative impact of the support protrusion structure on the fan's performance. Utility Model Content

[0004] In order to at least address one or more of the technical problems mentioned above, this disclosure proposes a centrifugal fan and electronic equipment in several aspects.

[0005] In a first aspect, this disclosure provides a centrifugal fan, comprising: a fan blade having a hub and a plurality of blades, the blades being disposed around the hub; a reinforcing ring disposed on the blades; and a housing having an upper housing plate disposed on one side of the fan blade along its axial direction, the upper housing plate having a support protrusion that protrudes outward from the side opposite to the fan blade and is recessed on the side facing the fan blade, the recess being completely covered by the reinforcing ring along the axial direction of the fan blade.

[0006] In some embodiments, the upper shell plate is provided with a plurality of support protrusions, which are spaced apart from each other in the projection area of ​​the reinforcing ring along its axial direction on the upper shell plate.

[0007] In some embodiments, a plurality of support protrusions are circumferentially and uniformly arranged around the center of the reinforcing ring and along the axial direction of the fan blade on the upper shell plate.

[0008] In some embodiments, the support protrusion is formed to have a circular cross-section.

[0009] In some embodiments, the support protrusion is formed as an arcuate protrusion concentric with the reinforcing ring.

[0010] In some embodiments, the upper shell plate is provided with a variety of support protrusions with different cross-sectional shapes.

[0011] In some embodiments, the support protrusion is formed as an annulus protruding from the upper shell plate away from the fan blade, and the annulus is concentrically arranged with the reinforcing ring.

[0012] In some embodiments, the housing further includes a lower housing, which is fixedly connected to the upper housing plate and together encloses the fan blades.

[0013] In a second aspect, this disclosure provides an electronic device including a centrifugal fan according to the first aspect and several embodiments.

[0014] By providing the centrifugal fan and electronic device as described above, the embodiments disclosed herein, by providing a support protrusion on the casing of the centrifugal fan and aligning the recess on the inner side of the protrusion with the reinforcing ring on the fan blade along the axial direction of the fan blade, can improve the pressure resistance of the centrifugal fan while reducing the negative impact of the support protrusion structure on the fan performance. Attached Figure Description

[0015] The above and other objects, features, and advantages of exemplary embodiments of this disclosure will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this disclosure are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0016] Figure 1 This diagram illustrates the structure of some centrifugal fans in the prior art;

[0017] Figure 2 A schematic diagram of another centrifugal fan in the prior art is shown;

[0018] Figure 3 This diagram illustrates the structure of yet another centrifugal fan in the prior art;

[0019] Figure 4a An exemplary perspective view of a centrifugal fan according to some embodiments of this disclosure is shown;

[0020] Figure 4b An exemplary exploded view of a centrifugal fan according to some embodiments of this disclosure is shown;

[0021] Figure 4c An exemplary exploded view of a centrifugal fan according to some embodiments of this disclosure is shown;

[0022] Figure 5 An exemplary top view of a centrifugal fan according to some embodiments of this disclosure is shown.

[0023] Figure 6 An exemplary top view of a centrifugal fan according to some embodiments of this disclosure is shown;

[0024] Figure 7 An exemplary top view of a centrifugal fan according to some embodiments of this disclosure is shown;

[0025] Figure 8 A table comparing the operating parameters of centrifugal fans according to some embodiments of this disclosure with two existing fans under the same operating conditions is shown.

[0026] Figure 9 An exemplary perspective view of an electronic device according to some embodiments of this disclosure is shown.

[0027] Explanation of reference numerals in the attached figures:

[0028] 10-Outer casing; 100-Centrifugal fan; 11-Upper casing plate; 110-Upper air outlet; 111-Support protrusion; 111a-Long arc edge; 111b-Short arc edge; 116-Recess; 12-Lower casing; 120-Lower air outlet; 20-Fan blade; 200-Electronic equipment; 21-Reinforcing ring; 221-Blade; 222-Hub; 80-Main body; 91-Casing; 910-Upper air outlet; 911-Support protrusion; 912-Support ring; 92-Fan blade. Detailed Implementation

[0029] The technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, not all of them. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0030] It should be understood that the terms “comprising” and “including” used in this disclosure and claims indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0031] It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this disclosure. As used in this disclosure and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this disclosure and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0032] As used in this specification and claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0033] Figure 1 A schematic diagram of the structure of some centrifugal fans in the prior art is shown. The centrifugal fan includes a housing 91 and fan blades 92 disposed inside the housing 91. An upper air vent 910 is provided at the top of the housing 91 to allow airflow from the fan blades 92. In devices using this centrifugal fan, such as laptops, due to internal space limitations, the upper side of the centrifugal fan will inevitably be close to or adjacent to user operation areas such as the keyboard. These operation areas are easily subjected to pressure from user actions such as typing, causing downward deformation and thus pressing against the upper surface of the fan housing 91. This results in the upper surface pressing downward against the fan blades 92, affecting the normal operation of the fan.

[0034] To address the aforementioned issues, existing technologies often incorporate support protrusions on the upper surface of the housing 91 to enhance the fan housing's pressure resistance. Specifically, see... Figure 2 , Figure 2 A schematic diagram of another centrifugal fan in the prior art is shown. Multiple support protrusions 911 are provided on the upper side of the fan housing 91. These support protrusions 911 are formed by stamping or molding and are distributed on the upper surface of the housing 91. By changing the original planar structure to a support protrusion structure, the mechanical properties of this area change, converting some of the vertical pressure into tensile stress along the side of the protrusion structure, thereby enhancing the compressive strength of the housing 91 and reducing the probability of fan rotation being affected by deformation due to external pressure. See also... Figure 3 , Figure 3 A schematic diagram of another centrifugal fan in the prior art is shown. A support ring 912 protruding upwards is formed along the edge of the upper air inlet 910 of the centrifugal fan. The function of this support ring 912 is similar to that of the aforementioned support protrusion, which is to enhance the compressive strength of the casing.

[0035] Due to structural strength requirements, the side of the aforementioned support protrusion facing the fan blades is usually set as a recess that opens towards the fan side. This will affect the airflow inside the fan when it is working. When the airflow passes near the recess, it will become turbulent due to the sudden change in the shape of the flow path, resulting in the generation of turbulence. This will cause problems such as increased sound pressure level and obstruction of cavity backflow, thus reducing the fan's airflow and air pressure performance.

[0036] In view of this, the present disclosure provides a centrifugal fan that, by providing a support protrusion on the casing of the centrifugal fan and setting the recess on the inner side of the protrusion to be covered by a reinforcing ring on the fan blades in the axial direction of the fan, can improve the pressure resistance of the centrifugal fan while reducing the negative impact of the support protrusion structure on the fan performance.

[0037] The specific embodiments disclosed herein will now be described in detail with reference to the accompanying drawings.

[0038] See Figures 4a to 5 , Figure 4a An exemplary perspective view of a centrifugal fan according to some embodiments of this disclosure is shown. Figure 4b An exemplary exploded view of a centrifugal fan according to some embodiments of this disclosure is shown. Figure 4c An exemplary exploded view of a centrifugal fan according to some embodiments of this disclosure is shown. Figure 5 An exemplary top view of a centrifugal fan according to some embodiments of this disclosure is shown, wherein the projection area of ​​the reinforcing ring 21 along its axial direction on the upper shell plate 11 is shown in dashed lines, and the projection of the recess 116 in the top view is marked by diagonal lines.

[0039] In this embodiment, the centrifugal fan 100 includes a housing 10, fan blades 20 disposed inside the housing 10, and a reinforcing ring 21 disposed on the fan blades 20. The fan blades 20 include a hub 222 and a plurality of blades 221, with the blades 221 arranged around the hub 222 and the reinforcing ring 21 disposed on the blades 221. The housing 10 has an upper shell plate 11 disposed on one side of the fan blades 20 along their axial direction. The upper shell plate 11 has a supporting protrusion 111, which protrudes outward from the side opposite to the fan blades 20 and forms a recess 116 on the side facing the fan blades 20. The recess 116 is completely covered by the reinforcing ring 21 along the axial direction of the fan blades 20.

[0040] Specifically, the fan blade 20 is shaped like a disc, and both the fan blade 20 and the reinforcing ring 21 are mainly made of engineering plastics or other materials through molding or other methods. The fan blade 20 includes a central hub 222 and multiple blades 221 extending radially outward from the hub 222. The reinforcing ring 21 is located on the radially outer side of the fan blade 20 and is a regular circular ring. The reinforcing ring 21 is fixedly connected to the radially outer end of each blade 221 through integral molding or other methods to increase the overall strength of the fan blade 20. The side of the reinforcing ring 21 facing the upper shell plate 11 is set as a plane parallel to the upper shell plate 11. The hub 222 is used to connect to a drive mechanism such as a motor to drive the fan blade 20 to rotate as a whole under the drive of the corresponding drive mechanism. The outer shell 10 is made of materials such as plastic or metal and can be formed as a single unit or assembled from multiple separate parts. In this embodiment, the outer casing 10 has an upper casing plate 11 disposed along the axial direction of the fan blade 20 on one side of the fan blade 20, and the upper casing plate 11 is also provided with an upper air outlet 110 aligned with the blade 221 portion of the fan blade 20. The upper air outlet 110 is used to guide the airflow blown out by the rotating fan blade 20.

[0041] In addition, the upper shell plate 11 is provided with a support protrusion 111 protruding away from the fan blade 20 along the axial direction of the fan blade 20. This support protrusion 111 is used to enhance the pressure resistance of the shell. In order to form the support protrusion 111 on the upper shell plate 11 to convert part of the vertical pressure into tensile stress along the side direction of the protrusion structure, the interior of the support protrusion 111 is formed as a recess 116 opening towards the fan blade 20. This recess 116 is covered by the reinforcing ring 21 of the fan blade 20 along the axial direction of the fan blade 20. When the fan blade 20 rotates, multiple blades 221 can fan the air, and the reinforcing ring 21, because it is formed as a regular ring, will have a significantly weaker influence on the airflow when rotating than the blades 221. Therefore, due to the obstruction of the reinforcing ring 21, a weaker wind speed flow field will be formed in the area between the reinforcing ring 21 and the upper shell plate 11 along its axial direction.

[0042] By changing the size and shape of the recess 116 on the back of the support protrusion 111, the width of the recess 116 can be made smaller than the width of the reinforcing ring 21, and the recess 116 can be completely covered by the axial projection of the reinforcing ring 21 on the fan blade 20 in the axial direction. By setting the recess 116 to be covered by the area corresponding to the reinforcing ring 21, when the fan is operating, the recess 116 can be entirely contained within the weaker airflow field formed between the reinforcing ring 21 and the upper shell plate 11, thereby reducing the negative impact of the recess 116 on the airflow inside the fan. Thus, while enhancing the compressive strength of the outer shell 10 through the support protrusion 111, the negative impact of the structure of the support protrusion 111 on fan performance is also significantly reduced.

[0043] See Figure 6 , Figure 6 An exemplary top view of a centrifugal fan according to some embodiments of this disclosure is shown. In this embodiment, a plurality of support protrusions 111 are provided on the upper shell plate 11, and the plurality of support protrusions 111 are spaced apart from each other in the projection area of ​​the reinforcing ring 21 along its axial direction on the upper shell plate 11. By providing a plurality of support protrusions 111 on the upper shell plate 11, the plurality of support protrusions 111 can jointly form a support area, and the pressure falling between or near the plurality of support protrusions 111 can be shared by the plurality of support protrusions 111 and the pressure is transmitted to a plurality of corresponding positions on the surface of the upper shell plate 11. Thus, on the one hand, the probability of a single support protrusion 111 deforming due to excessive load is reduced, and on the other hand, the pressure distribution on the upper shell plate 11 after the load is transmitted to the upper shell plate 11 is more dispersed and even, reducing the deformation amplitude of the upper shell plate 11 under pressure, thereby improving the overall maximum compressive strength of the upper shell plate 11.

[0044] Further, or optionally, the multiple support protrusions 111 are arranged at uniform intervals around the projection point of the center of the reinforcing ring 21 onto the upper shell plate 11 at the same angle. That is, the multiple support protrusions 111 are circumferentially and uniformly arranged around the projection point of the fan blade 20 onto the upper shell plate 11 along the axial direction of the fan blade 20. Specifically, the projection point of the center of the reinforcing ring 21 onto the upper shell plate 11 corresponds to the center point of the projection of the fan blade 20 onto the upper shell plate 11. By arranging the multiple support protrusions 111 at uniform intervals around this center point at the same angle α, a support area completely covering the area corresponding to the fan blade 20 can be formed among the multiple support protrusions 111, significantly reducing the possibility that the pressure point acting on the upper shell plate 11 falls outside the coverage area of ​​the support area and compresses the fan blade 20. At the same time, the multiple support protrusions 111 arranged at equal intervals can ensure that the portion of the upper shell plate 11 corresponding to the above-mentioned support area has substantially the same compressive strength, reducing the probability of local deformation due to uneven distribution of local compressive strength.

[0045] Furthermore, in this embodiment, the support protrusion 111 is formed with a circular cross-section. The side of the support protrusion 111 facing away from the fan blade 20 is formed as a cylindrical protrusion, creating multiple circular support surfaces at its protruding distal end. This shape of the support protrusion 111 results in a smaller deformation volume, allowing for the placement of as many support protrusions 111 as possible within limited space, forming multiple corresponding support positions. Correspondingly, the recess 116 formed on its back side will also have a smaller volume, reducing its negative impact on airflow within the fan. Moreover, forming the support protrusion 111 as a cylinder simplifies its manufacturing process, thus reducing the overall production cost of the fan. Those skilled in the art will understand that in some embodiments not shown, the side of the support protrusion 111 facing away from the fan blade 20 may also be set to a hemispherical shape, achieving a similar overall effect to the cylindrical support protrusion 111, but with a smaller volume change, a more compact structure, and greater advantages for miniaturization of electronic devices.

[0046] See you again Figure 5 In this embodiment, the support protrusion 111 is formed as an arc-shaped protrusion concentric with the reinforcing ring 21. Specifically, the cross-section of the support protrusion 111 includes two long arc-shaped edges 111a concentric with the reinforcing ring 21, and short arc-shaped edges 111b located at both ends of the two long arc-shaped edges 111a and connecting them sequentially. By setting this arc-shaped protrusion concentric with the reinforcing ring 21, the support protrusion 111 has stronger bending strength along the length of its long arc-shaped edges 111a. Furthermore, since the corresponding recess 116 has an arc-shaped extension along the circumference of the fan blade 20, when the fan is working, the airflow encounters relatively fewer changes in the flow channel shape when flowing in the recess 116, thereby reducing the total amount of turbulence generated and thus reducing the negative impact of the recess 116 of the support protrusion 111 on wind pressure and airflow.

[0047] Those skilled in the art will understand that although various embodiments of the support protrusion 111 being configured as a circular protrusion or an arc-shaped protrusion have been described above, this disclosure does not limit the specific form of the support protrusion 111, as long as the corresponding recess 116 of the support protrusion 111 is aligned with the reinforcing ring 21 in the axial direction along the fan blade 20. For example, in some embodiments not shown, the support protrusion 111 may also be formed with a rectangular or other shaped cross-section, or the upper shell plate 11 may be provided with a variety of support protrusions 111 with different cross-sectional shapes. Thus, the shape and position of the support protrusion 111 can be flexibly arranged according to the shape of the components around the fan and the requirements for heat dissipation and support, balancing the needs of support strength and spatial arrangement.

[0048] Further or alternatively, see Figure 7 , Figure 7An exemplary top view of a centrifugal fan according to some embodiments of this disclosure is shown. In this embodiment, the support protrusion 111 is formed as an annulus protruding from the upper shell plate 11 away from the fan blade 20, and the annulus is concentrically arranged with the reinforcing ring 21. Thus, the upper shell plate 11 forms a circular support area that completely covers the corresponding area of ​​the fan blade 20 by means of the annular support protrusion 111, and the annular support protrusion 111 also acts as a reinforcing rib to increase the overall structural strength of the upper shell plate 11. At the same time, since the recess 116 corresponding to the annular support protrusion 111 is also formed as annulus, the change in flow channel shape encountered by the airflow in the recess 116 when flowing in the fan is further reduced, thereby reducing the total amount of turbulence generated and reducing the negative impact of the recess 116 of the support protrusion 111 on wind pressure and airflow.

[0049] See you again Figures 4a to 4c In this embodiment, the outer casing 10 further includes a lower casing 12, which is fixedly connected to the upper casing 11 and together encloses the fan blade 20. The lower casing 12 is also provided with a lower air outlet 120, which at least partially overlaps with the fan blade 20 along its axial direction. It cooperates with the upper air outlet 110 to form an inlet and outlet for airflow, respectively. The lower casing 12 and the upper casing 11 are fixedly connected by means of snap-fit ​​or similar methods. The lower casing 12 and the upper casing 11 provide protection and structural support for the internal fan blade 20, and also define the shape of the airflow channel, preventing the airflow from encountering irregular flow channel shapes and thus avoiding increases in sound pressure and decreases in airflow and air pressure performance when the airflow from the fan blade 20 encounters these irregular flow channel shapes. It is understood that in some embodiments not shown, the lower casing 12 may also be provided with support protrusions 111 symmetrical to those on the upper casing 11. Similar to the support protrusion 111 on the upper shell plate 11, the support protrusion 111 on the lower shell 12 protrudes outward from the side away from the fan blade 20, and forms a recess 116 on the side facing the fan blade 20. The recess 116 is completely covered by the reinforcing ring 21 along the axial direction of the fan blade 20 to further enhance the fan's resistance to pressing.

[0050] See Figure 8 , Figure 8 A comparison table of operating parameters of centrifugal fans according to some embodiments of this disclosure with two existing fans under equivalent operating conditions is shown. The fan of type one is as follows: Figure 1 The fan shown in the image does not have any supporting protrusions; the fan of type two is as follows. Figure 2 The arrangement shown includes multiple supporting protrusions located at the edge of the upper air vent 910, while the type three fan is as disclosed herein. Figure 4aThe fan in the embodiment is shown below. Based on experimental data, it can be concluded that, under the same rotational speed of 5100 rpm, the ultimate compressive strength of the Type 1 fan is 4.5 kg, the sound pressure level (SPL) is 40 dBA, the maximum flow rate (Qmax) is 5.3 cubic feet per minute (cfm), and the maximum static pressure (Pmax) is 13.5 mmAq; the ultimate compressive strength of the Type 2 fan is 6.5 kg, the sound pressure level (SPL) is 41.5 dBA, the maximum flow rate (Qmax) is 5 cubic feet per minute (cfm), and the maximum static pressure (Pmax) is 11.2 mmAq; the ultimate compressive strength of the Type 3 fan is 6.5 kg, the sound pressure level (SPL) is 40 dBA, the maximum flow rate (Qmax) is 5.3 cubic feet per minute (cfm), and the maximum static pressure (Pmax) is 13.5 mmAq. Therefore, compared with the operating parameters of the existing products mentioned above, the centrifugal fan according to the embodiments disclosed herein combines the advantages of both the unsupported protrusion design and the conventional support protrusion design, thereby increasing the pressing strength while ensuring performance.

[0051] According to some embodiments of this disclosure, the centrifugal fan has a support protrusion on its housing, and the recess on the inner side of the protrusion is completely covered by the reinforcing ring on the fan blade. Compared with a design without a support protrusion, this design can improve the centrifugal fan's pressure resistance. At the same time, compared with some existing designs with support protrusions, this design can reduce the total amount of turbulence generated, reduce the negative impact of the recess of the support protrusion on wind pressure and air volume, and has a significant noise reduction effect.

[0052] See Figure 9 , Figure 9 An exemplary perspective view of an electronic device according to some embodiments of this disclosure is shown. In this embodiment, the electronic device 200 includes a centrifugal fan 100 according to the various embodiments described above. The electronic device 200 is, for example, a laptop computer, and the centrifugal fan 100 is installed inside the main body 80 of the electronic device 200. The upper shell of the centrifugal fan 100 may be disposed below the operating area such as the keyboard of the main body 80, so that the user's operating pressure can act on the support protrusions on the upper shell, thereby reducing the deformation of the fan shell and reducing the probability of the fan blades being pressed by operating pressure.

[0053] While numerous embodiments of this disclosure have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and intent of this disclosure. It should be understood that various alternatives to the embodiments of this disclosure described herein may be employed in the practice of this disclosure. The appended claims are intended to define the scope of this disclosure and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A centrifugal fan characterized by comprising: include: The fan blade (20) has a hub (222) and a plurality of blades (221) arranged around the hub (222); A reinforcing ring (21) is provided on the blade (221); The outer casing (10) has an upper shell plate (11) disposed on one side of the fan blade (20) along the axial direction. The upper shell plate (11) is provided with a support protrusion (111). The support protrusion (111) protrudes outward from the side away from the fan blade (20) and is formed as a recess (116) on the side facing the fan blade (20). The recess (116) is completely covered by the reinforcing ring (21) along the axial direction of the fan blade (20).

2. The centrifugal fan according to claim 1, characterized in that The upper shell plate (11) is provided with a plurality of support protrusions (111), and the plurality of support protrusions (111) are arranged at intervals on the projection area of ​​the reinforcing ring (21) on the upper shell plate (11) along the axial direction of the fan blade (20).

3. The centrifugal fan according to claim 2, characterized in that Multiple support protrusions (111) are circumferentially and uniformly arranged around the center of the reinforcing ring (21) along the axial direction of the fan blade (20) on the projection point of the upper shell plate (11).

4. The centrifugal fan according to any one of claims 1 to 3, characterized in that, The support protrusion (111) is formed to have a circular cross-section.

5. The centrifugal fan according to any one of claims 1 to 3, characterized in that, The support protrusion (111) is formed as an arc-shaped protrusion concentric with the reinforcing ring (21).

6. The centrifugal fan according to any one of claims 1 to 3, characterized in that, The upper shell plate (11) is provided with a variety of support protrusions (111) with different cross-sectional shapes.

7. The centrifugal fan according to claim 1, wherein The support protrusion (111) is formed as an annulus protruding from the upper shell plate (11) away from the fan blade (20), and the annulus is concentrically arranged with the reinforcing ring (21).

8. The centrifugal fan according to claim 1, wherein The outer shell (10) also includes a lower shell (12), which is fixedly connected to the upper shell plate (11) and together surrounds the fan blade (20).

9. The centrifugal fan according to claim 8, characterized in that The lower housing (12) is provided with a support protrusion (111), the support protrusion (111) protrudes outward from the side away from the fan blade (20), and the side facing the fan blade (20) is formed as a recess (116), and the recess (116) is completely covered by the reinforcing ring (21) along the axial direction of the fan blade (20).

10. An electronic device, comprising: Including the centrifugal fan according to any one of claims 1 to 9.

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