Centrifugal fan and electronic equipment

Abstract

The invention provides a centrifugal fan and electronic equipment, and relates to the technical field of fans. The centrifugal fan comprises a base, a volute, a first air outlet, a second air outlet, a first flow guide plate, fan blades and a shell. The volute is arranged along the edge of the base. The first air outlet and the second air outlet are both formed in the volute, and the first air outlet is located at the upstream position of the second air outlet in the flowing direction of airflow in the volute; the first flow guide plate is arranged on the base and located at the first air outlet, the thickness direction of the first flow guide plate is consistent with that of the base, the upper surface of the first flow guide plate is lower than the top of the volute, the shell covers the top of the volute, a cavity is formed between the shell and the base in a clamped mode, and the fan blades are arranged in the cavity. According to the centrifugal fan and the electronic equipment, the air outlet efficiency can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fans, and particularly to a centrifugal fan and an electronic device. Background Art

[0002] In the heat dissipation system of electronic devices, centrifugal fans, with their excellent static pressure characteristics, play a core role in maintaining the safe operating temperature of components. As consumer electronic products evolve towards extreme thinness and lightness, the reduction in the outlet opening area leads to a significant increase in system impedance. Under the condition of limited static pressure of the centrifugal fan, the actual effective air volume decays due to the need to overcome higher resistance. Currently, the industry generally increases the number of outlets to disperse the air flow path and reduce local impedance, thereby increasing the total air volume. However, the increase in the number of outlets will disperse the static pressure resources of the fan, resulting in a decrease in the effective static pressure of each outlet, and thus affecting the overall air outlet efficiency. Summary of the Invention

[0003] In order to solve at least one problem mentioned in the background art, the present invention provides a centrifugal fan and an electronic device, which can improve the air outlet efficiency.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] In a first aspect, the present invention provides a centrifugal fan, including a base, a volute, a first air outlet, a second air outlet, a first guide plate, a fan blade, and a housing. The volute is arranged along the edge of the base;

[0006] Both the first air outlet and the second air outlet are opened at the volute, and in the direction of the air flow inside the volute, the first air outlet is located upstream of the second air outlet;

[0007] The first guide plate is arranged on the base and located at the first air outlet. The thickness direction of the first guide plate is the same as the thickness direction of the base. The upper surface of the first guide plate is lower than the top of the volute. The housing covers the top of the volute, and a cavity is formed between the housing and the base. The fan blade is arranged in the cavity.

[0008] As an optional implementation manner, the thickness of the first guide plate is greater than or equal to 0.3 mm.

[0009] As an optional implementation manner, in the direction of the air flow inside the volute, the thickness of the first guide plate is equal, and the side of the first guide plate facing the fan blade is arc-shaped.

[0010] As an optional implementation manner, in the direction of the air flow inside the volute, the thickness of the first guide plate decreases in a stepped manner.

[0011] As an optional implementation manner, in the direction of the air flow inside the volute, the thickness of the first guide plate decreases continuously.

[0012] As an alternative embodiment, the first deflector plate is provided with diversion grooves arranged at intervals, and in the direction from the fan blade to the first air outlet, the diversion grooves extend to opposite ends of the first deflector plate.

[0013] As an alternative embodiment, the cross-section of the diversion groove is arc-shaped, and in the width direction of the diversion groove, a plurality of diversion grooves are arranged in a wavy pattern on the surface of the first deflector plate.

[0014] As an alternative embodiment, the first deflector plate is provided with a plurality of air holes, the first deflector plate has a cavity, and the air holes are communicated with the cavity.

[0015] As an alternative embodiment, it further includes a third air outlet and a second deflector plate, and in the direction of the airflow in the volute, the third air outlet is located downstream of the second air outlet, and the second deflector plate is arranged on the base and located at the second air outlet.

[0016] In a second aspect, the present invention further provides an electronic device, including the centrifugal fan in the first aspect.

[0017] The centrifugal fan provided by the present invention includes a base, a volute, a first air outlet, a second air outlet, a first deflector plate, a fan blade and a housing. The volute is arranged along the edge of the base; both the first air outlet and the second air outlet are opened at the volute, and in the direction of the airflow in the volute, the first air outlet is located upstream of the second air outlet; the first deflector plate is arranged on the base and located at the first air outlet, the thickness direction of the first deflector plate is consistent with the thickness direction of the base, the upper surface of the first deflector plate is lower than the top of the volute, the housing covers the top of the volute, a cavity is formed between the housing and the base, and the fan blade is arranged in the cavity.

[0018] The centrifugal fan provided by the present invention effectively solves the contradiction between the static pressure dispersion and the air volume attenuation of the multi-air outlet system in the thin and light electronic device through the design of the hierarchical air outlet and the diversion structure. Specifically, the present invention utilizes the characteristic that the static pressure of the airflow in the volute of the centrifugal fan decreases along the flow direction, arranges the first air outlet in the high-pressure upstream area, the second air outlet is located in the low-pressure downstream area, and a deflector plate is arranged at the first air outlet to form a flow channel layout of hierarchical pressure relief. By reasonably designing the shape of the deflector plate, the static pressure loss of the airflow at the first air outlet can be reduced through the deflector plate, and the air pressure at the second air outlet is increased. The centrifugal fan provided by the present invention avoids the problem of static pressure dispersion caused by the traditional multi-air outlet while increasing the number of air outlets, ensures the effective air pressure of each air outlet, realizes the effect of increasing the heat dissipation air volume without increasing the power consumption of the fan, thereby improving the air outlet efficiency. Description of the Drawings

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0020] Figure 1 Schematic diagram of the overall structure of the centrifugal fan provided by the embodiment of the present invention;

[0021] Figure 2 Schematic diagram of the first structure of the first guide vane in the centrifugal fan provided by the embodiment of the present invention;

[0022] Figure 3 Schematic diagram of the second structure of the first guide vane in the centrifugal fan provided by the embodiment of the present invention;

[0023] Figure 4 Schematic diagram of the third structure of the first guide vane in the centrifugal fan provided by the embodiment of the present invention;

[0024] Figure 5 For Figure 4 Enlarged view of part A;

[0025] Figure 6 Schematic diagram of the fourth structure of the first guide vane in the centrifugal fan provided by the embodiment of the present invention;

[0026] Figure 7 For Figure 6 Cross-sectional view of the first guide vane in

[0027] Explanation of reference numerals:

[0028] 100 - Centrifugal fan;

[0029] 110 - Base;

[0030] 120 - Fan blade;

[0031] 130 - Volute;

[0032] 140 - First air outlet;

[0033] 150 - Second air outlet;

[0034] 160 - First guide vane;

[0035] 161 - Flow guide groove;

[0036] 162 - Air hole;

[0037] 163 - Cavity;

[0038] 170 - Outer shell. Detailed implementation

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0040] In the application, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly used to better describe the present invention and its embodiments, rather than to limit that the indicated device, element or component must have a specific orientation or be constructed and operated in a specific orientation.

[0041] Moreover, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present invention can be understood according to the specific situation.

[0042] In addition, the terms "installed", "set", "provided with", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there is an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific situation.

[0043] In addition, terms such as "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), rather than to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, the meaning of "a plurality" is two or more.

[0044] Currently, in electronic equipment cooling systems, centrifugal fans, with their excellent static pressure characteristics, play a core role in maintaining safe component operating temperatures. As consumer electronics evolve towards extreme lightness and thinness, the reduction in air outlet opening area has led to a significant increase in system impedance. Given the limited static pressure of a centrifugal fan, the actual effective air volume is attenuated due to the need to overcome higher resistance. The industry generally increases the number of air outlets to disperse the airflow path and reduce local impedance, thereby increasing the total air volume. However, increasing the number of air outlets disperses the fan's static pressure resources, resulting in a decrease in the effective static pressure at each outlet, which in turn affects the overall air output efficiency.

[0045] In view of this, the present invention provides a centrifugal fan, comprising a base, a volute, a first air outlet, a second air outlet, a first guide plate, fan blades and an outer shell, wherein the volute is arranged along the edge of the base; the first air outlet and the second air outlet are both opened at the volute, and in the direction of air flow in the volute, the first air outlet is located upstream of the second air outlet; the first guide plate is arranged on the base and located at the first air outlet, the thickness direction of the first guide plate is consistent with the thickness direction of the base, the upper surface of the first guide plate is lower than the top of the volute, the outer shell cover is arranged at the top of the volute, a cavity is formed between the outer shell and the base, and the fan blades are arranged in the cavity. The present invention utilizes the characteristic that the static pressure of the airflow in the volute of a centrifugal fan decreases along the flow direction, arranges the first air outlet in the high-pressure upstream area, and the second air outlet in the low-pressure downstream area, and arranges a guide plate at the first air outlet to form a flow channel layout with graded pressure relief. By rationally designing the shape of the guide plate, the guide plate can reduce the static pressure loss of the airflow at the first air outlet, increase the wind pressure of the airflow at the second air outlet, and thus improve the air outlet efficiency.

[0046] Figure 1 A schematic diagram of the overall structure of a centrifugal fan provided by an embodiment of the present invention; Figure 2 A schematic diagram of a first structure of a first guide plate in a centrifugal fan provided by an embodiment of the present invention; Figure 3 A schematic diagram of a second structure of the first guide plate in the centrifugal fan provided by an embodiment of the present invention; Figure 4 A third structural schematic diagram of the first guide plate in the centrifugal fan provided by an embodiment of the present invention; Figure 5 for Figure 4 A magnified view of point A; Figure 6 A fourth structural schematic diagram of the first guide plate in the centrifugal fan provided by an embodiment of the present invention is provided. Figure 7 for Figure 6 Cross-sectional view of the first guide plate in FIG.

[0047] You can refer to Figures 1 to 7, an embodiment of the present invention provides a centrifugal fan 100, which includes a base 110, a volute 130, a first air outlet 140, a second air outlet 150, a first deflector 160, a fan blade 120, and a housing 170. The volute 130 is arranged along the edge of the base 110; both the first air outlet 140 and the second air outlet 150 are opened at the volute 130, and in the direction of the airflow in the volute 130, the first air outlet 140 is located upstream of the second air outlet 150; the first deflector 160 is arranged on the base 110 and is located at the first air outlet 140. The thickness direction of the first deflector 160 is the same as the thickness direction of the base 110. The upper surface of the first deflector 160 is lower than the top of the volute 130. The housing 170 covers the top of the volute 130. A cavity is formed between the housing 170 and the base 110, and the fan blade 120 is arranged in the cavity.

[0048] The centrifugal fan 100 provided by the embodiment of the present invention effectively solves the contradiction between static pressure dispersion and air volume attenuation in the multi-air outlet system of thin and light electronic devices through the design of hierarchical air outlets and diversion structures. Specifically, the embodiment of the present invention utilizes the characteristic that the static pressure of the airflow in the volute 130 of the centrifugal fan 100 decreases along the flow direction, sets the first air outlet 140 in the high-pressure upstream area, and the second air outlet 150 in the low-pressure downstream area, and arranges a deflector at the first air outlet 140 to form a flow channel layout of hierarchical pressure relief. By reasonably designing the shape of the deflector, the static pressure loss of the airflow at the first air outlet 140 can be reduced through the deflector, and the air pressure at the second air outlet 150 can be increased. The centrifugal fan 100 provided by the embodiment of the present invention avoids the problem of static pressure dispersion caused by traditional multi-air outlets while increasing the number of air outlets, ensures the effective air pressure of each air outlet, realizes the effect of increasing the heat dissipation air volume without increasing the power consumption of the fan, and thus improves the air outlet efficiency.

[0049] Wherein, one side of the first deflector 160 facing the fan blade 120 can be an arc surface. It can be understood that the fan blade 120 drives the airflow towards the air outlet, and the arc surface can gently receive the high-speed airflow. Compared with a straight surface, it can reduce the impact energy loss and allow the airflow to flow smoothly towards the first air outlet 140 along the arc.

[0050] In the above embodiment, the thickness of the first guide plate 160 can be greater than or equal to 0.3 mm. It is understood that when the thickness of the guide plate exceeds 0.3 mm, its structural strength is sufficient to resist the impact vibration of the high-speed airflow, avoid resonant deformation, and at the same time maintain a stable guide surface shape, ensuring that when the high-pressure airflow passes through the first air outlet 140, the guide plate can effectively reduce static pressure loss and guide the airflow to the target area. If the thickness is less than 0.3 mm, on the one hand, the overly thin guide plate is prone to flutter under the high-pressure airflow of the centrifugal fan, resulting in additional aerodynamic noise and energy loss; on the other hand, its insufficient structural rigidity will cause the guide surface to deform, destroying the preset flow field distribution and causing turbulence in the airflow at the first air outlet 140. Not only will the expected static pressure maintenance effect fail to be achieved, but the wind pressure attenuation at the downstream second air outlet 150 will also be aggravated. Especially in lightweight devices, this structural failure will directly lead to an imbalance in the air volume distribution of the multi-outlet system.

[0051] In the above embodiment, the thickness of the first guide plate 160 is uniform along the direction of airflow in the volute 130. The uniform thickness of the first guide plate 160 ensures balanced airflow, avoids sudden changes in local airflow pressure, and ensures smooth airflow transition.

[0052] like Figure 2 As shown, in the above embodiment, the thickness of the first guide plate 160 can be reduced in a step-like manner along the direction of the airflow in the volute 130. The first guide plate 160 is designed in this way. On the one hand, it can conform to the characteristic that the static pressure of the airflow in the volute 130 of the centrifugal fan 100 decreases along the flow direction. The step-like thickness change can accurately adapt and guide the airflow in different static pressure areas. Specifically, near the first air outlet 140 in the high-pressure upstream area, the thicker part of the guide plate can provide a stable and powerful initial guide for the airflow, reduce the energy loss and static pressure loss caused by the impact of the airflow, and ensure that the airflow enters the first air outlet 140 in an orderly manner. As the airflow advances to the low-pressure downstream area, the thickness of the guide plate decreases in a step-like manner, gradually reducing the resistance to the airflow, so that the airflow can transition more smoothly to the second air outlet 150, avoiding turbulence caused by sudden decompression. In this way, the high-pressure advantage at the first air outlet 140 is fully utilized, and the airflow connection with the second air outlet 150 is cleverly coordinated, effectively avoiding the disadvantages of static pressure dispersion and air volume attenuation in the traditional multi-air outlet design. Without increasing the fan power consumption, the heat dissipation air volume is improved, and the air outlet efficiency is optimized in all aspects.

[0053] like Figure 3As shown, in the above embodiment, the thickness of the first deflector 160 can be continuously reduced along the direction of airflow within the volute 130. It can be understood that because the static pressure of the airflow within the volute 130 of the centrifugal fan 100 decreases along the flow direction, the thicker deflector portion near the beginning of the high-pressure upstream zone effectively receives the high-speed, high-pressure airflow, accurately blocking and guiding the airflow, effectively reducing static pressure losses caused by factors such as airflow impact and deflection, and ensuring that the airflow is discharged from the first air outlet 140 in a stable and orderly manner. As the airflow advances toward the low-pressure downstream zone, the thickness of the deflector continues to smoothly narrow, closely following the decay of the airflow static pressure. This gradual process not only avoids airflow turbulence caused by sudden changes in resistance, but also ensures that the resistance changes encountered by the airflow during its journey to the second air outlet 150 are smoother, thereby making the secondary airflow transition from the first air outlet 140 to the second air outlet 150 smoother, further optimizing airflow efficiency.

[0054] like Figure 4 and Figure 5 As shown, in the above embodiment, the first guide plate 160 may have guide grooves 161 arranged at multiple intervals. In the direction from the fan blades 120 to the first air outlet 140, the guide grooves 161 extend to the opposite ends of the first guide plate 160 (the length direction of the guide grooves 161 may be perpendicular to the width direction of the first air outlet 140 or form a certain angle). When the fan blades 120 rotate at high speed to cause the airflow to surge toward the air outlet, the guide grooves 161, with their own special groove structure, can effectively interfere with the movement trajectory of the airflow. The originally chaotic airflow that interferes with and collides with each other can become regular and orderly under the combing of the guide grooves 161, and then rush toward the first air outlet 140 stably, making the most of the static pressure advantage of this area and improving the airflow delivery efficiency. Secondly, the guide groove 161 also has the function of absorbing and dissipating the acoustic noise energy of the gas. In the process of the airflow passing through the guide groove 161 at high speed, due to the continuous friction and collision between the airflow and the wall of the guide groove 161, the acoustic noise energy carried by the gas has a way to be released and converted. Part of the noise energy is absorbed and dissipated by the wall of the guide groove 161 in the form of heat energy, etc., which effectively reduces the noise level during the operation of the fan. Furthermore, the guide groove 161 can provide a solid foundation for the airflow connection at the second air outlet 150, making the subsequent airflow transition to the second air outlet 150 smoother and smoother. This cooperates with the overall graded pressure relief flow channel layout to further enhance the ability of the centrifugal fan 100 to solve the contradiction between static pressure dispersion and air volume attenuation in the heat dissipation scenario of thin and light electronic equipment, and achieve the purpose of efficient heat dissipation and low-noise operation.

[0055] like Figure 4 and Figure 5As shown, in the above embodiment, the cross-section of the guide groove 161 can be arc-shaped, and along the width direction of the guide groove 161, multiple guide grooves 161 are arranged in a wavy undulation on the surface of the first guide plate 160. When the airflow rushes out from the fan blade 120 at high speed and rushes towards the first guide plate 160, the wavy guide groove 161 disrupts the originally relatively regular flow path of the airflow. The airflow moves along these undulating grooves, constantly experiencing changes such as acceleration, deceleration, and turning. Between the crests and troughs of adjacent guide grooves 161, the airflow velocity and pressure produce a significant difference. This difference promotes mutual mixing and intensified disturbance within the airflow, thereby effectively increasing the degree of turbulence. Moreover, due to the undulations of the guide grooves 161, the airflow has a relatively slow flow rate and a relatively high pressure when flowing through the crests, while the flow rate accelerates and the pressure decreases when flowing through the troughs. In this way, multiple small pressure difference areas are formed within the same guide groove 161 and between adjacent guide grooves 161. These pressure differences promote continuous airflow, which not only optimizes the distribution of airflow in the area of the first guide plate 160, but also enables the airflow to be driven toward the first air outlet 140 more efficiently, fully exploiting the static pressure advantage of this area and improving the utilization efficiency of the airflow. In addition, when the gas carrying sonic noise flows through the wavy guide groove 161, the airflow frequently rubs and collides with the wall of the guide groove 161, causing part of the sonic noise energy to be absorbed and dissipated by the wall in the form of heat energy. Due to the existence of pressure differences and the tortuousness of the airflow path, the noise energy is constantly dispersed and weakened. For example, when the sound wave propagates along the guide groove 161, it encounters alternating changes in crests and troughs, and its propagation direction is constantly changed. The energy is also dispersed in different directions, making it difficult to form concentrated noise that propagates outward, thereby effectively reducing the noise level when the fan is running.

[0056] like Figure 6 and Figure 7As shown, in the above embodiment, the first guide plate 160 may have a plurality of air holes 162, and the first guide plate 160 has a cavity 163, and the air holes 162 are connected to the cavity 163. When the airflow rushes from the fan blade 120 to the first guide plate 160 at high speed, a part of the airflow will enter these air holes 162, so that the distribution of the airflow in the area of the first guide plate 160 is more uniform, avoiding excessive concentration or accumulation of the airflow in a local area. This uniform airflow distribution helps to make full use of the static pressure resources at the first air outlet 140 and improve the airflow efficiency. Secondly, when the airflow passes through the first guide plate 160, part of the airflow will enter the cavity 163 through the air holes 162 and reflect in the cavity 163, interfering with the original sound wave in the cavity 163, and part of the sound wave energy is offset. By adjusting the size of the air holes 162 and the cavity 163, the sound wave noise at different frequencies can be solved. It should be noted that the first guide plate 160 can be provided with both the air holes 162 and the guide grooves 161 structures, or only the air holes 162 structures. The choice can be made based on needs and is not specifically limited here. When the first guide plate 160 is provided with both the air holes 162 and the guide grooves 161 structures, a portion of the airflow will be orderly guided through the guide grooves 161, while another portion of the airflow will enter the air holes 162. The airflow entering the air holes 162 and the airflow passing through the guide grooves 161 are intertwined, further enhancing the turbulence of the airflow, allowing the airflow to better exchange heat with the surrounding environment when leaving the first air outlet 140, thereby improving the heat dissipation effect.

[0057] In the above embodiment, a third air outlet can also be included, and the third air outlet is located downstream of the second air outlet 150 along the direction of the air flow in the volute 130. It can be understood that the rotation of the fan blades 120 causes the air flow to flow in the volute 130, and first discharges part of the air flow through the first air outlet 140 in the high-pressure upstream area to relieve pressure, and relies on the first guide plate 160 to ensure efficient air outlet; the remaining air flow is diverted again to the second air outlet 150 in the low-pressure downstream area; the third air outlet at the most downstream receives the air flow that has changed after the first two pressure reliefs, provides an outlet for the air flow that has not been fully discharged, avoids the accumulation of air flow in the volute 130, and improves the utilization rate. In addition, the third air outlet can also expand the heat dissipation area, and the air flow can be adjusted as needed for components with uneven internal heat and severe local heating. For example, in the high-temperature area near the third air outlet, by adjusting the fan speed and the guide structure, more air flow can be guided to be discharged from here to cool down, thereby achieving refined heat dissipation and improving overall efficiency.

[0058] In the above embodiments, a second deflector may further be included. The second deflector is disposed on the base 110 and at the second air outlet 150. When the air flow flows from the first air outlet 140 to the second air outlet 150 after pressure relief, the state of the air flow such as pressure and flow velocity has changed. The second deflector can accurately guide this part of the air flow according to the air flow characteristics in the low-pressure downstream area where the second air outlet 150 is located. Through reasonable structural design, it enables the air flow to pass through the second air outlet 150 orderly, effectively avoiding the phenomenon of air flow disorder or backflow in this area, ensuring the air pressure at the third air outlet, and thus optimizing the air flow distribution of the entire fan, enabling full utilization of the static pressure resources in different areas of the volute 130.

[0059] In addition, an embodiment of the present invention further provides an electronic device, including the centrifugal fan 100 in the above embodiments. The centrifugal fan 100 includes a base 110, a volute 130, a first air outlet 140, a second air outlet 150, a first deflector 160, fan blades 120, and a housing 170. The volute 130 is disposed along the edge of the base 110; both the first air outlet 140 and the second air outlet 150 are opened at the volute 130, and in the direction of the air flow inside the volute 130, the first air outlet 140 is located upstream of the second air outlet 150; the first deflector 160 is disposed on the base 110 and at the first air outlet 140. The thickness direction of the first deflector 160 is the same as the thickness direction of the base 110, and the upper surface of the first deflector 160 is lower than the top of the volute 130. The housing 170 covers the top of the volute 130, and a cavity is formed between the housing 170 and the base 110, and the fan blades 120 are disposed in the cavity. An embodiment of the present invention utilizes the characteristic that the static pressure of the air flow in the volute 130 of the centrifugal fan 100 decreases along the flow direction, sets the first air outlet 140 in the high-pressure upstream area, the second air outlet 150 in the low-pressure downstream area, and disposes a deflector at the first air outlet 140 to form a flow channel layout with hierarchical pressure relief. By reasonably designing the shape of the deflector, the static pressure loss of the air flow at the first air outlet 140 can be reduced through the deflector, the air pressure at the second air outlet 150 can be increased, and the effect of improving the heat dissipation air volume without increasing the power consumption of the fan is achieved, thereby improving the heat dissipation performance of the electronic device.

[0060] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A centrifugal fan, characterized in that, It includes a base, a volute, a first air outlet, a second air outlet, a first deflector, a fan blade and a housing. The volute is arranged along the edge of the base. Both the first air outlet and the second air outlet are formed in the volute. In the direction of the air flow inside the volute, the first air outlet is located upstream of the second air outlet. The first deflector is arranged on the base and is located at the first air outlet. The thickness direction of the first deflector is the same as that of the base. The upper surface of the first deflector is lower than the top of the volute. The housing is covered on the top of the volute. A cavity is formed between the housing and the base, and the fan blade is arranged in the cavity.

2. The centrifugal fan according to claim 1, wherein, The thickness of the first deflector is greater than or equal to 0.3 mm.

3. The centrifugal fan according to claim 1, characterized in that In the direction of the air flow inside the volute, the thickness of the first deflector is equal, and the side of the first deflector facing the fan blade is an arc surface.

4. The centrifugal fan according to claim 1, wherein In the direction of the air flow inside the volute, the thickness of the first deflector decreases in a stepped manner.

5. The centrifugal fan according to claim 1, wherein, In the direction of the air flow inside the volute, the thickness of the first deflector decreases continuously.

6. The centrifugal fan according to any one of claims 1-5, characterized in that, The first deflector is provided with a plurality of spaced-apart flow guide grooves. In the direction from the fan blade to the first air outlet, the flow guide grooves extend to the opposite ends of the first deflector.

7. The centrifugal fan according to claim 6, wherein The cross-section of the flow guide groove is arc-shaped. In the width direction of the flow guide groove, a plurality of the flow guide grooves are arranged in a wavy pattern on the surface of the first deflector.

8. The centrifugal fan according to any one of claims 1-5, characterized in that, The first deflector is provided with a plurality of air holes. The first deflector has a cavity, and the air holes are communicated with the cavity.

9. The centrifugal fan according to any one of claims 1-5, characterized in that, It further includes a third air outlet and a second deflector. In the direction of the air flow inside the volute, the third air outlet is located downstream of the second air outlet. The second deflector is arranged on the base and is located at the second air outlet.

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

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