Centrifugal fan and electronic device

Abstract

Provided are a centrifugal fan and an electronic device. The centrifugal fan comprises a volute (1) and an impeller (2), wherein the volute (1) has an accommodating cavity and is provided with an air outlet (11) and at least one air inlet (12); the impeller (2) is located in the accommodating cavity and is rotatably connected to the volute (1); and among the at least one air inlet (12), a plurality of notches (121) are formed in at least part of the at least one air inlet (12). In the centrifugal fan and the electronic device, the centrifugal fan has lower aerodynamic noise while minimizing the impact on the performance of the centrifugal fan, so that noise from a terminal device using the centrifugal fan is reduced, thereby improving the user experience.

Description

Centrifugal fan and electronic equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on March 5, 2024, with application number 202410251606.6 and application name "A Centrifugal Fan and Electronic Equipment", the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of heat dissipation technology, and in particular to a centrifugal fan and electronic equipment. Background Art

[0004] In terminal devices such as mobile phones, laptops, two-in-one computers, tablets, routers, virtual reality (VR) devices, and augmented reality (AR) devices that use air-cooling and heat dissipation systems, centrifugal fans are one of the core components of the air-cooling and heat dissipation system. Specifically, the centrifugal fan operates in the terminal device, and through the rotation of the impeller, a pressure difference is generated in the air, which promotes the flow of cold air, thereby transferring the heat of the terminal device to the environment through heat exchange. However, when the air flows in the terminal device and the centrifugal fan, the interaction between the air and the air and the gas-solid interaction generated by the air flowing through the fixed structure or the moving structure will generate large aerodynamic noise. The aerodynamic noise of the centrifugal fan is one of the main noise sources of the terminal device. Therefore, it is very necessary to take measures to reduce the aerodynamic noise of the fan to improve the user experience.

[0005] In the prior art, noise issues are not considered when designing centrifugal fans, with only aerodynamic design being performed. After the initial centrifugal fan design is completed, the fan's noise level is adjusted to the target value by reducing the fan's speed. While this solves the noise issue, it also reduces the fan's performance (e.g., output air volume, air pressure, etc.), which in turn affects the heat dissipation of the terminal device. Summary of the Invention

[0006] The embodiments of the present application provide a centrifugal fan and an electronic device, which can reduce the aerodynamic noise of the centrifugal fan without affecting the performance of the centrifugal fan as much as possible, thereby reducing the noise of the terminal device using the centrifugal fan and improving the user experience.

[0007] In a first aspect, the present application provides a centrifugal fan comprising a volute and an impeller, wherein the volute has a receiving cavity, an air outlet, and at least one air inlet; the impeller is located in the receiving cavity and is rotatably connected to the volute; and at least a portion of the at least one air inlet is provided with multiple notches. In this solution, the multiple notches are provided in a partial area or the entire area of ​​the at least one air inlet of the volute. The provision of the multiple notches can reduce the turbulence of the air at the air inlet, thereby reducing aerodynamic noise at the air inlet; the provision of the multiple notches can also weaken the interaction between the incoming air turbulence and the impeller, thereby reducing noise within the centrifugal fan. The centrifugal fan provided in this application has an improved structural design that can reduce the aerodynamic noise of the centrifugal fan while minimizing the impact on the centrifugal fan's performance, thereby reducing the noise of terminal devices using the centrifugal fan and improving the user experience. Specifically, when air is drawn into the centrifugal fan through the air inlet, it generates high turbulence, thereby generating large vortices. These vortices are responsible for the aerodynamic noise. The vortices generated at the air inlet will also move to the blades of the impeller, interacting with the solid wall surface (i.e., the wall surface of the blades) in the impeller, thereby generating a large aerodynamic noise. By providing multiple notches at the air inlet, the large vortices generated when the air flows through the multiple notches can be broken up into small vortices, thereby reducing the turbulence of the air. As a result, the centrifugal fan provided by the present application can reduce the local noise at the air inlet, reduce the vortices entering the impeller, reduce the noise in the impeller area, and reduce the overall noise of the centrifugal fan and even the electronic equipment using the centrifugal fan through structural improvements.

[0008] In one possible embodiment, the volute includes a base and a top cover, the top cover being fixed to the base and together with the base enclosing the accommodating cavity; the impeller is rotatably connected to the base, the top cover is provided with an air inlet, and at least a portion of the air inlet on the top cover is provided with a plurality of notches. The provision of the plurality of notches reduces the turbulence of the air at the air inlet, thereby reducing aerodynamic noise at the air inlet; at the same time, when adopting this solution, the provision of the plurality of notches can also weaken the interaction between the turbulent flow of the incoming air and the impeller, thereby reducing the noise inside the centrifugal fan.

[0009] Furthermore, in a possible embodiment, the base is provided with at least one air inlet, and at least a partial area of ​​the at least one air inlet on the base is provided with a plurality of the notches.

[0010] In one possible embodiment, the impeller includes a hub and a plurality of blades, the hub being rotatably connected to the volute, the plurality of blades being spaced apart along the circumference of the hub; an air flow channel being formed between two adjacent blades, a section of the air flow channel close to the hub being an air inlet section, a section of the air flow channel away from the hub being an air outlet section, the air inlet section being close to the air inlet, and the air outlet section being able to be close to the air outlet; and the edge of each blade having at least a portion thereof provided with a plurality of notches. In this way, the interaction between the incoming flow turbulence and the blades can be weakened by providing the plurality of notches on the blade edges, thereby reducing the noise inside the centrifugal fan, so that the centrifugal fan provided in the embodiment of the present application can obtain the dual superposition benefits of air inlet noise reduction and blade noise reduction, and significantly reduce the aerodynamic noise of the centrifugal fan.

[0011] Furthermore, in one possible embodiment, the blade includes a first edge proximate to the top cover and a second edge proximate to the base, and the plurality of notches are provided in at least a portion of at least one of the first edge and the second edge. This configuration of the blades of a centrifugal fan can alter the air flow field within the impeller, reducing the turbulence intensity within the impeller, breaking up large vortices into smaller ones, reducing vortex energy, and lowering aerodynamic noise generated by the interaction between air and the blades, thereby achieving noise reduction for the centrifugal fan.

[0012] Furthermore, in a possible embodiment, the plurality of notches are provided in the entire area of ​​at least one of the first edge and the second edge.

[0013] In one possible embodiment, each of the notches is arc-shaped, and adjacent notches are smoothly connected. For example, the multiple notches together form a wavy structure. Furthermore, in one possible embodiment, the edges of the wavy structure are sinusoidal. Tests have shown that this configuration reduces aerodynamic noise in centrifugal fans.

[0014] In a possible embodiment, the edge of at least one of the plurality of notches includes an arc segment and a straight line segment connected to each other. Tests have shown that when this configuration is adopted, the aerodynamic noise of the centrifugal fan is also low.

[0015] In a possible embodiment, the plurality of notches are connected end to end to form a sawtooth structure. Tests have shown that when this arrangement is adopted, the aerodynamic noise of the centrifugal fan is low.

[0016] In a possible embodiment, the number of the notches at the air inlet on the top cover is greater than or equal to 5, and the number of the notches at the edges of the blades is greater than or equal to 2. Tests have shown that when this configuration is adopted, the aerodynamic noise of the centrifugal fan is lower.

[0017] In a second aspect, an embodiment of the present application provides an electronic device, which includes a heat source device and a centrifugal fan provided by the technical solution of the first aspect, wherein the centrifugal fan is used to dissipate heat for the heat source device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 is a schematic structural diagram of a centrifugal fan provided in an embodiment of the present application;

[0019] FIG2 is a schematic structural diagram of a volute in the centrifugal fan shown in FIG1 ;

[0020] FIG3 is a front view of the centrifugal fan shown in FIG1 ;

[0021] FIG4 is a front view of a volute in another centrifugal fan provided in an embodiment of the present application;

[0022] FIG5 is a schematic diagram of an air inlet of a volute in a centrifugal fan provided in an embodiment of the present application;

[0023] FIG6 is a cross-sectional view of a centrifugal fan provided in an embodiment of the present application;

[0024] FIG7 is a schematic structural diagram of an impeller in a centrifugal fan provided in an embodiment of the present application;

[0025] FIG8 is an enlarged view of point D in FIG7 ;

[0026] FIG9 is a schematic diagram of a centrifugal fan according to an embodiment of the present application;

[0027] FIG10 is a schematic diagram of another centrifugal fan provided in an embodiment of the present application;

[0028] FIG11 is a schematic diagram of another centrifugal fan provided in an embodiment of the present application;

[0029] FIG12 is a schematic diagram of another centrifugal fan provided in an embodiment of the present application;

[0030] FIG13 is a schematic diagram of another centrifugal fan provided in an embodiment of the present application;

[0031] FIG14 is a schematic diagram of another centrifugal fan provided in an embodiment of the present application;

[0032] FIG15 is a schematic diagram of a partial structure of an air inlet of a volute in a centrifugal fan provided in an embodiment of the present application;

[0033] FIG16 is a schematic diagram of a partial structure of an air inlet of a volute in a centrifugal fan provided in an embodiment of the present application;

[0034] FIG17 is a schematic diagram of a partial structure of an air inlet of a volute in a centrifugal fan provided in an embodiment of the present application;

[0035] FIG18 is a schematic diagram of the partial structure of the air inlet of the volute in another centrifugal fan provided in an embodiment of the present application.

[0036] Label: 1-volute; 101-base; 102-top cover; 11-air outlet; 12-air inlet; 121-gap; 2-impeller; 21-hub; 22-blade; 23-disc. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of this application clearer, this application will be further described in detail below with reference to the accompanying drawings.

[0038] It should be noted that the terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and claims of this application, the singular expressions "a," "an," "said," "above," "the," and "this" are intended to include expressions such as "one or more," unless the context clearly indicates otherwise.

[0039] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in yet other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0040] FIG1 is a schematic structural diagram of a centrifugal fan provided in an embodiment of the present application, and FIG2 is a schematic structural diagram of a volute 1 in the centrifugal fan shown in FIG1 . As shown in FIG1 and FIG2 , a centrifugal fan provided in an embodiment of the present application includes a volute 1 and an impeller 2. Specifically, the volute 1 has a receiving cavity, an air outlet 11, and at least one air inlet 12. The impeller 2 is located in the receiving cavity of the volute 1, and the impeller 2 is rotatably connected to the volute 1, so that the impeller 2 can rotate in the receiving cavity of the volute 1 under the action of an external force, causing a pressure difference in the air, thereby promoting the flow of cold air around the heat source device and achieving heat dissipation of the heat source device. Furthermore, among the at least one air inlet 12 of the volute 1, at least a portion of the area of ​​at least one air inlet 12 is provided with a plurality of notches 121. That is, among the at least one air inlet 12 of the volute 1, a partial area or the entire area of ​​at least one air inlet 12 is provided with a plurality of notches 121. In this solution, a plurality of notches 121 are provided in a local area or the entire area of ​​at least one air inlet 12 of the volute 1. The provision of the plurality of notches 121 can reduce the turbulence of the air at the air inlet 12, thereby reducing the aerodynamic noise at the air inlet 12; at the same time, the provision of the plurality of notches 121 can also weaken the interaction between the incoming flow turbulence and the impeller 2, thereby reducing the noise inside the centrifugal fan. The centrifugal fan provided in this application is structurally improved and designed to reduce the aerodynamic noise of the centrifugal fan without affecting the performance of the centrifugal fan as much as possible, thereby reducing the noise of the terminal equipment using the centrifugal fan and improving the user experience. Specifically, when air is sucked into the centrifugal fan from the air inlet 12, it will generate a large turbulence, thereby generating a large vortex. Aerodynamic noise is caused by these vortices. The vortex generated at the air inlet 12 will also move to the blades 22 of the impeller 2, interacting with the solid wall surface (that is, the wall surface of the blade 22) in the impeller 2, thereby generating a large aerodynamic noise. By providing multiple notches 121 at the air inlet 12, the large vortices generated when air flows through the notches 121 can be broken up into smaller vortices, thereby reducing the turbulence of the air. As a result, the centrifugal fan provided by this application can reduce local noise at the air inlet 12, reduce vortices entering the impeller 2, and reduce noise in the impeller 2 area. This structural improvement of the centrifugal fan reduces the overall noise of the centrifugal fan and, by extension, the electronic equipment that uses the centrifugal fan.

[0041] Continuing with reference to FIG1 , in some embodiments, the volute 1 includes a base 101 and a top cover 102 , the top cover 102 being fixed to the base 101 and forming a receiving cavity together with the base 101 , and the impeller 2 being rotatably connected to the base 101 . It is not difficult to understand that there are many ways to connect the base 101 and the top cover 102 , such as welding, bolting, or the base 101 and the top cover 102 being integrally formed. The specific connection method between the base 101 and the top cover 102 is not limited in this application. Furthermore, the top cover 102 is provided with an air inlet 12 , and at least a portion of the air inlet 12 on the top cover 102 is provided with a plurality of notches 121 , so that the turbulence of the air at the air inlet 12 is reduced by the provision of the plurality of notches 121 , thereby reducing the aerodynamic noise at the air inlet; at the same time, when adopting this solution, the interaction between the incoming turbulence and the impeller 2 can also be weakened by the provision of the plurality of notches 121 , thereby reducing the noise inside the centrifugal fan.

[0042] Figure 3 is a front view of the centrifugal fan shown in Figure 1, and Figure 4 is a front view of the volute 1 of another centrifugal fan provided in an embodiment of the present application. As shown in Figure 3, in one specific implementation, the top cover 102 is provided with an air inlet 12, and a plurality of notches 121 are provided in a local area of ​​the air inlet 12 on the top cover 102. As shown in Figure 4, in another specific implementation, the top cover 102 is provided with an air inlet 12, and a plurality of notches 121 are provided in the entire area of ​​the air inlet 12 on the top cover 102.

[0043] It should be understood that Figures 3 and 4 are merely schematic diagrams of the structure of the air inlet 12 on the top cover 102, and the approximate shape of the air inlet 12 on the top cover 102 is not limited to the circle shown in Figures 3 and 4. For example, in some embodiments, the approximate shape of the air inlet 12 on the top cover 102 can also be the shape of a circle with a portion cut off by a straight line, as shown in Figure 5.

[0044] Continuing with FIG4 , in some embodiments, the base 101 of the volute 1 is provided with at least one air inlet 12. For example, the base 101 is provided with one, two, three, or more air inlets 12. Furthermore, among the at least one air inlet 12 on the base 101, at least a portion of the area of ​​at least one air inlet 12 is provided with a plurality of notches 121. In other words, among the at least one air inlet 12 on the base 101, a partial area or the entire area of ​​at least one air inlet 12 is provided with a plurality of notches 121. For example, the base 101 is provided with three air inlets 12, and at least one of the three air inlets 12 is provided with a plurality of notches 121 in a partial area or the entire area.

[0045] It should be understood that there can be multiple combinations of the arrangement of the air inlets 12 on the base 101 and the top cover 102, and the arrangement of the notches 121 at each air inlet 12. For example, in one specific implementation, there is one air inlet 12 on the top cover 102, no air inlet 12 on the base 101, and a local area of ​​the air inlet 12 on the top cover 102 is provided with a plurality of notches 121; in another specific implementation, there is one air inlet 12 on the top cover 102, no air inlet 12 on the base 101, and the entire area of ​​the air inlet 12 on the top cover 102 is provided with a plurality of notches 121; in yet another specific implementation, there is one air inlet 12 on the top cover 102, three air inlets 12 on the base 101, and the top cover 102 has three notches 121. 02 is provided with a plurality of notches 121 in a local area of ​​the air inlet 12, and none of the air inlets 12 on the base 101 is provided with a plurality of notches 121; in another specific implementation, one air inlet 12 is provided on the top cover 102, three air inlets 12 are provided on the base 101, the entire area of ​​the air inlet 12 on the top cover 102 is provided with a plurality of notches 121, and a local area of ​​one air inlet 12 on the base 101 is provided with a plurality of notches 121; in another specific implementation, one air inlet 12 is provided on the top cover 102, three air inlets 12 are provided on the base 101, a local area of ​​the air inlet 12 on the top cover 102 is provided with a plurality of notches 121, and local areas of the three air inlets 12 on the base 101 are provided with a plurality of notches 121. It is not difficult to understand that the above-mentioned implementation methods are not exhaustive, and the settings of the air inlets 12 on the base 101 and the top cover 102 and the settings of the notches 121 at each air inlet 12 can also have other combinations, which are not listed here one by one.

[0046] Figure 6 is a cross-sectional view of a centrifugal fan according to an embodiment of the present application. Figure 7 is a schematic structural diagram of an impeller 2 in a centrifugal fan according to an embodiment of the present application. Figure 8 is an enlarged view of point D in Figure 7 . As shown in Figures 6-8 , in some embodiments, the impeller 2 includes a hub 21 and a plurality of blades 22. The hub 21 is rotatably connected to the volute 1. The plurality of blades 22 are spaced apart along the circumference of the hub 21, with an airflow channel C formed between adjacent blades 22. Furthermore, a section of the airflow channel C near the hub 21 is an inlet section C1, and a section of the airflow channel away from the hub 21 is an outlet section C2. The inlet section C1 is near the air inlet 12, and the outlet section C2 can be near the air outlet 11. Specifically, the air outlet 11 is located on the side of the volute 1. During rotation of the impeller 2, when the airflow channel C rotates to face the air outlet 11 of the volute 1, the outlet section C1 of the airflow channel C faces the air outlet 11 of the volute 1. Furthermore, the edge of each blade 22 may have multiple notches 121 in at least a portion of its area. In other words, the edge of each blade 22 may have multiple notches 121 in a partial area or in its entirety. In this way, the provision of multiple notches 121 on the edge of the blade 22 can reduce the interaction between the incoming turbulence and the blade 22, thereby reducing the noise inside the centrifugal fan. This allows the centrifugal fan provided in this embodiment of the application to achieve the dual benefits of air inlet noise reduction and blade noise reduction, significantly reducing the aerodynamic noise of the centrifugal fan.

[0047] Continuing with reference to FIG7 and FIG8 , in a specific implementation, the blade 22 includes a first edge L1 near the top cover 102 and a second edge L2 near the base 101, and at least a portion of at least one of the first edge L1 and the second edge L2 is provided with a plurality of notches 121. That is, the plurality of notches 121 may be provided in a local area of ​​the first edge L1 or the second edge L2, or in the entire area of ​​the first edge L1 or the second edge L2, or in a local area of ​​both the first edge L1 and the second edge L2, or in the entire area of ​​both the first edge L1 and the second edge L2. When the blade 22 of the centrifugal fan adopts this configuration, it is possible to change the air flow field inside the impeller 2, reduce the turbulence intensity inside the impeller 2, break up large vortices into small vortices, reduce vortex energy, and reduce the aerodynamic noise generated by the interaction between air and the blade 22, thereby achieving noise reduction for the centrifugal fan. Specifically, when the blades 22 of the centrifugal fan adopt this setting, the air turbulence intensity in the air inlet section C1 of the air flow channel C, between the first edge L1 of the blade 22 and the top cover 102, and at the air outlet section C2 of the air flow channel C can be reduced, thereby weakening the interaction between the turbulence and the solid wall and reducing fan noise.

[0048] During specific implementation, the direction of the blade 22 can be C-shaped or S-shaped. The blade 22 with a C-shaped direction is called a C-type blade. The C-type blade is usually connected to the wheel disc 23 and connected to the hub 21 through the wheel disc 23. The blade 22 with an S-shaped direction is called an S-type blade. The S-type blade is usually directly connected to the hub 21, as shown in Figure 8. Figures 9 to 14 are respectively schematic diagrams of a centrifugal fan provided in an embodiment of the present application, wherein the blade 22 shown in Figures 9, 11 and 13 represents a C-type blade, and the blade 22 shown in Figures 10, 12 and 14 represents an S-type blade. The setting of the edge notch 121 of the blade 22 is illustrated below with reference to Figures 9 to 14. As shown in Figure 9, in a specific implementation, the entire area of ​​the first edge L1 of the blade 22 is provided with a plurality of notches 121. As shown in Figure 10, in a specific implementation, a local area of ​​the first edge L1 of the blade 22 is provided with a plurality of notches 121. For example, the local area can be the area of ​​the first edge away from the air inlet. As shown in FIG11 , in a specific implementation, the entire area of ​​the second edge L2 of the blade 22 is provided with a plurality of notches 121. As shown in FIG12 , in a specific implementation, a local area of ​​the second edge L2 of the blade 22 is provided with a plurality of notches 121. As shown in FIG13 , in a specific implementation, the entire area of ​​the first edge L1 and the entire area of ​​the second edge L2 of the blade 22 are provided with a plurality of notches 121. As shown in FIG14 , in a specific implementation, a local area of ​​the first edge L1 and the local area of ​​the second edge L2 of the blade 22 are provided with a plurality of notches 121. Obviously, the second edge L2 of the blade 22 mentioned in this embodiment does not include the edge of the portion where the blade 22 is connected to the disk 23.

[0049] FIG15 is a schematic diagram of the partial structure of the air inlet 12 of the volute 1 in a centrifugal fan provided in an embodiment of the present application. The partial structure of the portion where the notch 121 is located at the edge of the blade 22 can also be referred to FIG15. As shown in FIG15, when the notch 121 is specifically provided at the corresponding air inlet 12 or the edge of the blade 22, in an optional implementation, each notch 121 is arc-shaped, and the connection between two adjacent notches 121 is smooth, that is, the connection between two adjacent notches 121 has no sharp parts. For example, multiple notches 121 together form a wavy structure, wherein the wavy structure refers to a structure with varying curvature at various locations.

[0050] Figure 16 is a schematic diagram of the partial structure of the air inlet 12 of the volute 1 in a centrifugal fan according to an embodiment of the present application. The partial structure of the portion where the notch 121 is located on the edge of the blade 22 can also be seen in Figure 16. As shown in Figure 16, when notches 121 are provided at the corresponding air inlet 12 or on the edge of the blade 22, in one optional implementation, the edge of at least one notch 121 includes interconnected arc segments and straight line segments.

[0051] Figure 17 is a schematic diagram of the partial structure of the air inlet 12 of the volute 1 in a centrifugal fan according to an embodiment of the present application, and Figure 18 is a schematic diagram of the partial structure of the air inlet 12 of the volute 1 in another centrifugal fan according to an embodiment of the present application. The partial structure of the notches 121 on the edges of the blades 22 can also be seen in Figures 17 and 18. As shown in Figures 17 and 18, multiple notches 121 are connected end to end to form a sawtooth structure.

[0052] When multiple notches 121 together form a wavy structure, the distance between two adjacent wave crests in the wavy structure is the wave width e1, and the maximum distance between each wave crest and wave trough and the baseline is the wave amplitude e2. The wave width e1 and wave amplitude e2 at each location in the wavy structure are determined according to the specifications and operating conditions of the centrifugal fan. The wave amplitude e1 and wave width e2 of each basic unit can be the same or different. That is, the wavy structure can be a wavy structure arranged in a periodic array, for example: the edge of the wavy structure is a sine curve. The wavy structure can also be a wavy structure with different wave widths e1 and wave amplitudes e2 at each location. Similarly, when multiple notches 121 together form a sawtooth structure, the distance between two adjacent wave crests in the sawtooth structure is the wave width e1, and the maximum distance between each wave crest and wave trough and the baseline is the wave amplitude e2. The wave width e1 and wave amplitude e2 at each location in the wavy structure are determined according to the specifications and operating conditions of the centrifugal fan. The wave amplitude e1 and wave width e2 of each basic unit can be the same or different. That is, the zigzag structure may be a zigzag structure arranged in a periodic array, or may be a zigzag structure with different wave widths e1 and wave amplitudes e2 at different locations.

[0053] In a specific implementation, the number of notches 121 at the air inlet 12 on the top cover 102 can be greater than or equal to 5, for example, the number of notches 121 at the air inlet 12 on the top cover 102 is 5, 6, 7, or more. The number of notches 121 at the edge of the blade 22 can be greater than or equal to 2, for example, the number of notches 121 at the edge of the blade 22 is 2, 3, 4, or more.

[0054] Comparing the noise test results of a centrifugal fan provided in an embodiment of the present application, which has multiple notches 121 only in a local area of ​​the air inlet 12 on the top cover, with a centrifugal fan of the same structure but without notches 121 on the air inlet 12 and blades 22, it can be seen that the maximum sound pressure level of the centrifugal fan provided in the embodiment of the present application, which has multiple notches 121 only in a local area of ​​the air inlet 12, is lower than the maximum sound pressure level of the centrifugal fan in the comparative example. In other words, the centrifugal fan provided in the embodiment of the present application, which has multiple notches 121 only in a local area of ​​the air inlet 12, is quieter than the centrifugal fan in the comparative example. At the same time, the test shows that the centrifugal fan provided in the embodiment of the present application, which has multiple notches 121 only in a local area of ​​the air inlet 12, achieves a noise reduction benefit of 1.94dBA compared to the centrifugal fan in the comparative example.

[0055] Comparing the noise test results of a centrifugal fan provided in an embodiment of the present application, which has multiple notches 121 only in a local area of ​​the first edge L1 of the blade 22, with a centrifugal fan of the same structure but without notches 121 on the air inlet 12 and the blade 22, it can be seen that the maximum sound pressure level of the centrifugal fan provided in the embodiment of the present application, which has multiple notches 121 only in a local area of ​​the first edge L1 of the blade 22, is lower than the maximum sound pressure level of the centrifugal fan in the comparative example. In other words, compared with the centrifugal fan in the comparative example, the centrifugal fan provided in the embodiment of the present application, which has multiple notches 121 only in a local area of ​​the first edge L1 of the blade 22, is quieter. At the same time, the test shows that the centrifugal fan provided in the embodiment of the present application, which has multiple notches 121 only in a local area of ​​the first edge L1 of the blade 22, achieves a noise reduction benefit of 1.36dBA compared to the centrifugal fan in the comparative example.

[0056] In addition, tests have shown that the centrifugal fan provided in the embodiment of the present application has multiple notches 121 in a local area of ​​the air inlet 12 on the top cover 102, and at the same time, has multiple notches 121 in a local area of ​​the first edge L1 of the blade 22. Compared with the centrifugal fan with the same structure but no notches 121 on the air inlet 12 and the blade 22, the noise reduction effect reaches 3.44dBA, the sound energy is reduced by more than 50%, and a significant noise reduction effect can be achieved.

[0057] An electronic device provided in an embodiment of the present application includes a heat source device and the above-mentioned centrifugal fan, and the centrifugal fan is used to dissipate heat for the heat source device. In this solution, a local area or the entire area of ​​at least one air inlet 12 of the volute 1 of the centrifugal fan is provided with a plurality of notches 121. The setting of the plurality of notches 121 can reduce the turbulence of the air at the air inlet 12, thereby reducing the aerodynamic noise at the air inlet 12; at the same time, the setting of the plurality of notches 121 can also weaken the interaction between the incoming flow turbulence and the impeller 2, thereby reducing the noise inside the centrifugal fan. The centrifugal fan provided in the present application has an improved structural design, which can make the aerodynamic noise of the centrifugal fan lower without affecting the performance of the centrifugal fan as much as possible, thereby reducing the noise of the terminal device using the centrifugal fan and improving the user experience. Specifically, when air is sucked into the centrifugal fan from the air inlet 12, it will generate a greater turbulence, thereby generating a larger vortex. The aerodynamic noise is caused by these vortices. The vortex generated at the air inlet 12 will also move to the blades 22 of the impeller 2, interacting with the solid wall surface (that is, the wall surface of the blades 22) in the impeller 2, thereby generating a large aerodynamic noise. By providing a plurality of notches 121 at the air inlet 12, the large vortex generated when the air flows through the plurality of notches 121 can be broken up into small vortices, thereby reducing the turbulence of the air. As a result, the centrifugal fan provided by the present application can reduce the local noise at the air inlet 12, and can also reduce the vortex entering the impeller 2, reducing the noise in the impeller 2 area, and reducing the overall noise of the centrifugal fan and even the electronic equipment using the centrifugal fan through structural improvements of the centrifugal fan.

[0058] The electronic devices mentioned in this embodiment include but are not limited to mobile phones, laptops, two-in-one computers, tablets, routers, virtual reality devices, augmented reality devices and other terminal devices. Taking a laptop as an example, the heat source device in the laptop includes a central processing unit (CPU). The heat of the CPU is transferred to a radiator, such as a heat sink, through components such as heat pipes. The centrifugal fan causes cold air to flow through the heat sink and take away the heat. It should be understood that cold air refers to the air heated by the heat source device, and its temperature is lower than the temperature of the air heated by the heat source device.

[0059] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A centrifugal fan, characterized in that: The invention comprises a volute and an impeller, wherein the volute has a receiving cavity, an air outlet and at least one air inlet; the impeller is located in the receiving cavity and is rotatably connected to the volute; In the at least one air inlet, at least a partial area of ​​the at least one air inlet is provided with a plurality of notches.

2. The centrifugal fan according to claim 1, wherein The volute includes a base and a top cover, the top cover is fixed to the base and together with the base encloses the accommodating cavity; the impeller is rotatably connected to the base, the top cover is provided with an air inlet, and at least a portion of the air inlet on the top cover is provided with a plurality of notches.

3. The centrifugal fan according to claim 2, wherein: The base is provided with at least one air inlet, and at least a partial area of ​​the at least one air inlet on the base is provided with a plurality of the notches.

4. The centrifugal fan according to claim 2 or 3, wherein: The impeller includes a hub and a plurality of blades, the hub is rotatably connected to the volute, and the plurality of blades are arranged at intervals along the circumference of the hub; an air flow channel is formed between two adjacent blades, a section of the air flow channel close to the hub is an air inlet section, and a section of the air flow channel away from the hub is an air outlet section, the air inlet section is close to the air inlet, and the air outlet section can be close to the air outlet; the edge of each blade has a plurality of notches in at least a partial area.

5. The centrifugal fan according to claim 4, wherein: The blade includes a first edge close to the top cover and a second edge close to the base, and at least a portion of at least one of the first edge and the second edge is provided with the plurality of notches.

6. The centrifugal fan according to claim 5, wherein: The plurality of notches are provided over an entire area of ​​at least one of the first edge and the second edge.

7. The centrifugal fan according to any one of claims 1 to 6, wherein: Each of the notches is arc-shaped, and two adjacent notches are smoothly connected.

8. The centrifugal fan according to claim 7, wherein: The plurality of notches together form a wave-shaped structure.

9. The centrifugal fan according to claim 8, wherein: The edge of the wavy structure is in a sine curve shape.

10. The centrifugal fan according to any one of claims 1 to 6, wherein: Among the plurality of notches, an edge of at least one of the notches includes arc segments and straight line segments connected to each other.

11. The centrifugal fan according to any one of claims 1 to 6, wherein: The plurality of notches are connected end to end to form a sawtooth structure.

12. The centrifugal fan according to any one of claims 4 to 6, wherein: The number of the notches at the air inlet on the top cover is greater than or equal to 5, and the number of the notches at the edge of the blade is greater than or equal to 2.

13. An electronic device, characterized in that: The invention comprises a heat source device and the centrifugal fan according to any one of claims 1 to 12, wherein the centrifugal fan is used for dissipating heat for the heat source device.

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