Centrifugal fan and electronic equipment
By setting grooves and raised structures on the long end surface of the centrifugal fan blade, the problem of high noise in the centrifugal fan is solved, and the noise reduction and heat dissipation performance is balanced, which is suitable for the lightweight design of electronic equipment.
Patent Information
- Application Number
- CN202410097382.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-23
- Publication Date
- 2025-08-01
AI Technical Summary
The existing centrifugal fans are noisy when running, which affects the user experience of electronic devices.
The grooves and raised structures are provided on the long end surface of the fan blade of the centrifugal fan, which reduces noise by dispersing the vortex, while optimizing the depth and height of the grooves and raised to maintain sufficient heat dissipation air.
It effectively reduces the noise of centrifugal fans, while ensuring sufficient heat dissipation performance, and adapts to the lightweight and thinning needs of electronic equipment.
Smart Images
Figure CN120402418A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of heat dissipation of electronic products, and particularly to a centrifugal fan and an electronic device. Background Art
[0002] At present, electronic components such as processors inside electronic devices generate heat during operation. If the heat dissipated by the electronic components during operation cannot be dissipated in time, the electronic components will stop working, and in severe cases, the processor may be burned. To solve the above problems, current manufacturers set centrifugal fans inside electronic devices to dissipate the heat of components such as processors. However, the current centrifugal fans generate relatively large noise during operation. Summary of the Invention
[0003] This application provides a centrifugal fan and an electronic device, and the centrifugal fan generates less noise during operation.
[0004] In the first aspect of this application, a centrifugal fan is provided, which includes a hub and a plurality of fan blades; the plurality of fan blades are fixedly spaced along the circumferential direction of the hub. The fan blade includes a first surface, a second surface, two long end faces, a first short end face, and a second short end face. The first surface and the second surface face away from each other along the thickness direction of the fan blade. The two long end faces, the first short end face, and the second short end face are all connected between the first surface and the second surface. One of the long end faces, the first short end face, the other long end face, and the second short end face are connected end to end in sequence. The two long end faces face away from each other along the width direction of the fan blade, and the first short end face and the second short end face face away from each other along the length direction of the fan blade; the first short end face of the fan blade is fixedly connected to the outer peripheral edge of the hub; along the circumferential direction of the hub, the first surface of any fan blade is spaced opposite to the second surface of the adjacent fan blade. The fan blade is provided with a plurality of grooves, the grooves are recessed in at least one long end face and penetrate through the first surface and the second surface, and a protrusion is formed between any two adjacent grooves; the plurality of grooves are arranged in sequence along the extending direction of the long end face.
[0005] When the centrifugal fan operates, eddy current noise will be generated. Eddy current noise is also called turbulent noise. It is mainly caused by the splitting of the airflow flowing through the interface of the fan blade, forming a boundary layer and vortex splitting and detachment, which causes pressure pulsation on the fan blade and radiates an unstable flow noise. When the centrifugal fan operates, the airflow enters the centrifugal fan along the thickness direction of the fan blade, then flows along the first surface, the second surface, and the two long end faces, and finally flows out of the centrifugal fan in a direction perpendicular to the thickness of the fan blade. When no grooves and protrusions are provided, the eddy current generated by the airflow flowing in the centrifugal fan is relatively large. In this embodiment, by providing grooves and protrusions on the long end face, the relatively large eddy current generated by the airflow flowing in the centrifugal fan is broken up. That is, when the eddy current flows through the grooves and protrusions, it is divided by the protrusions into discrete flows located in a plurality of grooves, thereby achieving the purpose of noise reduction.
[0006] In some embodiments, along the direction from the first short end face to the second short end face, the depths of the plurality of grooves gradually decrease, and the heights of the plurality of protrusions gradually decrease; the depth direction of the grooves is the same as the width direction of the fan blade, and the height direction of the protrusions is the same as the width direction of the fan blade. Thus, the grooves and protrusions near the hub can break up the large eddy currents closer to the hub, so as to significantly reduce the noise. The grooves and protrusions far from the hub can not only break up the small eddy currents farther from the hub to reduce the noise, but also reduce the influence of the grooves on the engineering degree of the fan blade, so that the centrifugal fan has sufficient heat dissipation air volume.
[0007] In some embodiments, along the direction from the first short end face to the second short end face, the widths of the plurality of protrusions gradually decrease, and the width direction of the protrusions is the same as the length direction of the fan blade. Thus, the grooves and protrusions near the hub can break up the large eddy currents closer to the hub, so as to significantly reduce the noise. The protrusions far from the hub can not only break up the small eddy currents farther from the hub to reduce the noise, but also reduce the influence of the grooves on the engineering degree of the fan blade, so that the centrifugal fan has sufficient heat dissipation air volume.
[0008] In some embodiments, the width dimension of the protrusion remains unchanged or gradually increases from the top to the bottom, the direction of the top of the protrusion is the same as the direction of the opening of the groove, and the direction of the top of the protrusion is the same as the direction of the bottom surface of the groove. If the width of the top of the protrusion is greater than the width of the bottom, when processing the fan blade with a mold, the bottom of the protrusion will be stuck and the mold cannot be removed. In the embodiments of the present application, setting the width of the protrusion to remain unchanged or gradually increase can prevent the protrusion from being stuck during mold removal, and thus facilitate mold removal.
[0009] In some embodiments, the shape of the protrusion is any one of a triangle, a square, a rectangle, a trapezoid or a semi-circle.
[0010] In some embodiments, the centrifugal fan further includes a volute. The volute is provided with a receiving cavity, an air inlet and an air outlet. Both the air inlet and the air outlet are communicated with the receiving cavity, and the planes where the air inlet and the air outlet are located are perpendicular to each other; the fan blade and the hub are both arranged in the receiving cavity; the rotation center axis of the hub is perpendicular to the plane where the air outlet is located; the fan blade includes a first part and a second part fixed along its length direction. Along the thickness direction of the centrifugal fan, the first part and the hub both face the air outlet, and the second part is in a hidden state; the long end face includes a first sub-end face and a second sub-end face; along the extension direction of the long end face, the first sub-end face and the second sub-end face are connected, the first sub-end face is opposite to the air outlet, and the second sub-end face is in a hidden state relative to the air outlet; a plurality of protrusions are arranged on the first sub-end face and / or the second sub-end face.
[0011] Specifically, the fan blade includes a first part and a second part fixed along its length direction. Along the thickness direction of the centrifugal fan, both the first part and the hub face the air outlet, and the second part is in a hidden state; the long end face includes a first sub-end face and a second sub-end face; the first short end face and the first sub-end face are located on the first part, and the second short end face and the second sub-end face are located on the second part; a plurality of protrusions are provided on the first sub-end face and / or the second sub-end face. The plurality of protrusions provided on the first sub-end face can reduce the noise of the first part, and the plurality of protrusions provided on the second sub-end face can reduce the noise of the second part.
[0012] In some embodiments, the width of the first part is greater than the width of the second part. The first part serves as an auxiliary work part, and the second part serves as a core work part. Setting the first part to be narrower in width can reduce the size of the fan blade, which is beneficial for the lightweight design of the centrifugal fan. And setting the second part to be wider in width can increase the work done by the fan blade to increase the air volume of the centrifugal fan and enhance the heat dissipation effect.
[0013] In some embodiments, the width of the fan blade is K1, and the height of the protrusion is H1, and K1 and H1 satisfy the following condition: H1 ≤ 0.5K1; the height direction of the protrusion is the same as the width direction of the fan blade. Thus, it can not only enable the protrusions and grooves to break up the eddy current but also prevent excessive loss of the work done by the fan blade.
[0014] In some embodiments, the fan blade is a straight blade, a forward-curved blade, or a backward-curved blade.
[0015] In some embodiments, the plurality of protrusions have the same shape, height, and width. This can facilitate processing.
[0016] In some embodiments, the volute includes a top wall, a bottom wall, and a side wall. The top wall and the bottom wall are respectively connected to opposite sides of the peripheral wall, and the top wall, the bottom wall, and the peripheral wall enclose an accommodation cavity. The air inlet is provided on the top wall, and the air outlet is provided on the peripheral wall. Thus, the structure of the volute is relatively simple, which can facilitate processing.
[0017] The second aspect of the present application provides an electronic device, including: a housing and a heat dissipation device. The housing is provided with an installation cavity, a ventilation port communicating with the installation cavity, and a heat dissipation port. The heat dissipation device is disposed in the installation cavity. The heat dissipation device includes the centrifugal fan according to any one of the first aspect of the present application. The air inlet of the centrifugal fan faces the ventilation port, and the air outlet of the centrifugal fan faces the heat dissipation port. Since the electronic device includes the centrifugal fan of the first aspect of the present application, the technical effects generated by the centrifugal fan are equally applicable to the electronic device. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background art, the following will describe the drawings required to be used in the embodiments of the present application or the background art.
[0019] Figure 1It is a schematic structural diagram of an electronic device provided by an embodiment of the present application.
[0020] Figure 2 It is Figure 1 a partial structural schematic diagram of the electronic device shown in
[0021] Figure 3 It is Figure 2 a schematic structural diagram of the centrifugal fan of the electronic device shown in
[0022] Figure 4 It is Figure 3 a schematic structural diagram of the centrifugal fan in another direction shown in
[0023] Figure 5 It is Figure 3 a schematic structural diagram of the fan blade of the centrifugal fan shown in
[0024] Figure 6 It is Figure 3 a partial structural schematic diagram of the centrifugal fan described above.
[0025] Figure 7 It is Figure 3 a schematic structural diagram of the first specific embodiment of the groove and protrusion setting mode of the fan blade of the centrifugal fan shown in
[0026] Figure 8 It is Figure 3 a schematic structural diagram of the second specific embodiment of the groove and protrusion setting mode of the fan blade of the centrifugal fan shown in
[0027] Figure 9 It is Figure 3 a schematic structural diagram of the third specific embodiment of the groove and protrusion setting mode of the fan blade of the centrifugal fan shown in
[0028] Figure 10 It is the eddy current distribution diagram when no grooves and protrusions are provided on the fan blade.
[0029] Figure 11 It is the eddy current distribution diagram when grooves and protrusions are provided on the fan blade.
[0030] Figure 12 It is a schematic structural diagram of another fan blade provided by an embodiment of the present application.
[0031] Figure 13 It is Figure 12 an enlarged schematic diagram of part A of
[0032] Figure 14 It is a schematic diagram of the shape of the protrusion of the fan blade provided by an embodiment of the present application.
[0033] Figure 15 It is Figure 7Schematic diagram of the first specific implementation manner of the first specific embodiment of the fan blade shown in [reference].
[0034] Figure 16 is Figure 3 is Figure 2 Schematic diagram of the structure of the centrifugal fan of the electronic device shown in [reference].
[0035] Figure 17 is Figure 7 Schematic diagram of the structure of the second specific implementation manner of the first specific embodiment of the fan blade shown in [reference].
[0036] Figure 18 Schematic diagram of the shape parameters and position parameters of the protrusion of the fan blade provided in the embodiments of the present application.
[0037] Figure 19 Columnar comparison chart of the noise simulation of the fan blade. Specific implementation manner
[0038] The embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.
[0039] Please refer to Figure 1 and Figure 2 , Figure 1 is a schematic diagram of the structure of the electronic device 1000 provided in the embodiments of the present application. Figure 2 is Figure 1 Partial schematic diagram of the electronic device 1000 shown in [reference]. The embodiments of the present application provide an electronic device 1000, which includes mobile terminals such as mobile phones, tablet computers, laptop computers, wearable devices, smart bracelets, navigation devices, personal digital assistants, etc., and fixed terminals such as large-screen TVs, desktop computers, vehicle-mounted devices, etc. In this embodiment, the electronic device 1000 is described as a laptop computer.
[0040] In this embodiment, the electronic device 1000 includes a display screen 200, a rotating shaft member 300, and a main body 400. The display screen 200 is connected to the main body 400 through the rotating shaft member 300, so that the display screen 200 can rotate relative to the main body 400, realizing that the display screen 200 can be opened or closed relative to the main body 400. When the display screen 200 is opened relative to the main body 400, the display screen 200 forms a certain angle with the main body 400, such as 90 degrees, 100 degrees, or 120 degrees, etc., and the electronic device 1000 can be used by the user. When the display screen 200 is closed relative to the main body 400, the electronic device 1000 is in a standby or shutdown state, so as to facilitate the storage of the electronic device 1000.
[0041] In this embodiment, the display screen 200 includes a display surface 201 and an appearance surface 202 facing away from each other. When the display screen 200 is closed relative to the main body 400, the display surface 201 is attached to the main body 400, and the appearance surface 202 is exposed and in a visible state. When the display screen 200 is opened relative to the main body 400, the display surface 201 is in a visible state, facilitating user observation and operation. The rotating shaft member 300 is a hinge or a hinge, and is connected between the display screen 200 and the main body 400. The rotating shaft member 300 is a rotating structure between the display screen 200 and the main body 400 to realize the rotation of the display screen 200 relative to the main body 400.
[0042] The main body 400 includes a housing 410, a keyboard 420, electronic components (not marked in the figure), and a heat dissipation device 430. The keyboard 420 is installed on the housing 410, and the keyboard 420 is exposed relative to the housing 410 so that the user can operate the keyboard 420. The electronic components and the heat dissipation device 430 are installed inside the housing 410. The electronic components include a circuit board 440, a processor 450, a memory module, and a graphics card, etc. The processor 450, the memory module, and the graphics card are integrated on the circuit board 440. Specifically, the keyboard 420 is electrically connected to the processor 450. The user can operate the keyboard 420 to generate an operation signal, and the processor 450 can process the operation signal. The heat dissipation device 430 is connected to the electronic components. The heat dissipation device 430 dissipates the heat generated when the electronic components operate. In particular, the processor 450 and the graphics card generate obvious heat when operating. After the heat dissipation device 430 dissipates the heat, it can prevent the electronic components from overheating and malfunctioning.
[0043] The housing 410 is in the shape of a cuboid and includes an installation wall 411, a support wall 412, and a peripheral wall 413. The installation wall 411 and the support wall 412 are arranged opposite to each other and are respectively connected to opposite sides of the peripheral wall 413. The installation wall 411, the support wall 412, and the peripheral wall 413 form an installation cavity 414 for accommodating devices such as electronic components and the heat dissipation device 430. The side of the installation wall 411 facing away from the installation cavity 414 is used to install the keyboard 420. When the display screen 200 is closed relative to the main body 400, the installation wall 411 is attached to the display screen 200 to shield and protect the keyboard 420. When the display screen 200 is opened relative to the main body 400, the installation wall 411 is exposed so that the keyboard 420 is exposed, thus facilitating user operation. The support wall 412 can contact an object such as a desktop on which the electronic device 1000 can be placed to facilitate the support of the electronic device 1000.
[0044] The peripheral wall 413 is provided with a heat dissipation port 415 for communicating the outside and the installation cavity 414 so that the heat emitted by the electronic components can flow to the outside through the heat dissipation port 415. The support wall 412 is provided with a ventilation port (not shown in the figure) for communicating the outside and the installation cavity 414 so that the outside air can enter the installation cavity 414 for the centrifugal fan 500 of the heat dissipation device 430 to operate.
[0045] The heat dissipation device 430 is installed in the installation cavity 414 of the housing 410. The heat dissipation device 430 includes a heat conduction tube 431, a soldering iron for heat dissipation (not shown in the figure), and a centrifugal fan 500. The heat conduction tube 431 is a copper tube. The soldering iron for heat dissipation is stacked on the electronic components. One end of the heat conduction tube 431 is stacked on the soldering iron for heat dissipation, and the other end is provided with heat dissipation fins. The heat dissipation fins are located at the air outlet 512 of the centrifugal fan 500. The air outlet 512 of the centrifugal fan 500 faces the heat dissipation opening 415 of the housing 410. When the electronic device 1000 is in a working state, the heat conduction tube 431 conducts the heat on the electronic components to the heat dissipation fins, and the centrifugal fan 500 blows air to the heat dissipation fins so that the heat on the heat dissipation fins is dissipated, thereby transferring the heat dissipated by the electronic components to the outside through the heat dissipation opening 415.
[0046] Please refer to Figure 3 and Figure 4 , Figure 3 is Figure 2 a schematic structural diagram of the centrifugal fan 500 of the electronic device 1000 shown in Figure 4 is Figure 3 a schematic structural diagram of the centrifugal fan in another direction shown in . The centrifugal fan 500 includes a volute 510, a hub 520, a plurality of fan blades 100, and a driving member (not shown in the figure). Here, the plurality means two or more. In a specific embodiment, the number of the fan blades 100 can be 60. In other specific embodiments, the number of the fan blades 100 can also be 50, 70, 80, or 100, etc. The present application is not limited.
[0047] The volute 510 includes a top wall 511, a bottom wall 514, and a side wall 515. The top wall 511 and the bottom wall 514 are respectively connected to opposite sides of the side wall 515. The volute 510 is provided with an accommodation cavity, an air inlet 513, and an air outlet 512. The air inlet 513 and the air outlet 512 are both communicated with the accommodation cavity, and the planes where the air inlet 513 and the air outlet 512 are located are perpendicular to each other. Specifically, the top wall 511, the bottom wall 514, and the peripheral wall 413 enclose the accommodation cavity. The air inlet 513 is provided on the top wall 511, and the air outlet 512 is provided on the peripheral wall 413. The top wall 511 and the peripheral wall 413 are perpendicular to each other.
[0048] The hub 520, the fan blades 100, and the driving member are all arranged inside the accommodation cavity. Among them, the driving member is a motor. The body of the motor is fixed to the cavity surface of the accommodation cavity. The hub 520 is fixed to the driving shaft of the motor, and the rotation center axis of the hub 520 is perpendicular to the top wall 511. The plurality of fan blades 100 are all fixed to the outer peripheral edge of the hub 520, and the plurality of fan blades 100 are evenly and spaced apart in the circumferential direction around the hub 520.
[0049] When the centrifugal fan 500 is working, the drive shaft of the motor drives the hub 520 and the fan blades 100 to rotate. Air flows from the air inlet 513 to the fan blades 100 and then out of the accommodation cavity from the air outlet 512, so as to dissipate the heat on the heat dissipation fins. As can be seen from Figure 4 the air flow direction of the air flow L1 entering the accommodation cavity through the air inlet 513 is perpendicular to the air flow L2 flowing out of the accommodation cavity through the air outlet 512.
[0050] The fan blades 100 can be straight blades, forward-curved blades or backward-curved blades. The straight blades have a simple structure and are easy to process. The forward-curved blades mean that the part of the fan blade 100 far from the hub 520 bends in the direction of the rotation of the hub 520. The forward-curved blades have high wind energy conversion efficiency, strong wind speed adaptability and low noise. The backward-curved blades mean that the part of the fan blade 100 far from the hub 520 bends in the direction away from the rotation of the hub 520. The backward-curved blades have less manufacturing difficulty, better stress performance and low maintenance cost.
[0051] Please refer to Figure 5 , Figure 5 which Figure 3 is a schematic structural diagram of the fan blade 100 of the centrifugal fan 500 shown in Figure 5 . The length direction of the fan blade 100 shown in Figure 5 is the X-axis direction, the width direction of the fan blade 100 is the Y-axis direction, and the thickness direction of the fan blade 100 is the Z-axis direction. The X-axis direction, the Y-axis direction and the Z-axis direction are perpendicular to each other in pairs.
[0052] The fan blade 100 includes a first surface 10, a second surface 11, two long end faces 12, a first short end face 13 and a second short end face 14. The first surface 10 and the second surface 11 face away from each other along the thickness direction of the fan blade 100. The two long end faces 12 face away from each other along the width direction of the fan blade 100. The first short end face 13 and the second short end face 14 face away from each other along the length direction of the fan blade 100. The first short end face 13, one of the long end faces 12, the second short end face 14 and the other long end face 12 are connected end to end in sequence. And the two long end faces 12, the first short end face 13 and the second short end face 14 are all connected between the first surface 10 and the second surface 11.
[0053] Refer to Figure 6 together, Figure 6 which Figure 3Schematic diagram of the partial structure of the centrifugal fan described in [reference]. The first short end faces 13 of multiple fan blades 100 are fixedly connected to the outer periphery of the hub 520, and the second short end faces 14 of the multiple fan blades 100 are free ends. Along the circumferential direction of the hub 520, the first surface 10 of any fan blade 100 and the second surface 11 of an adjacent fan blade 100 are spaced relatively. The space between the first surface 10 of any fan blade 100 and the second surface 11 of an adjacent fan blade 100 is a flow channel, and the space between the free ends of two adjacent fan blades 100 is the air outlet of the flow channel, which is used for the airflow in the flow channel to flow out.
[0054] In some embodiments, a plurality of grooves 20 are recessed in at least one long end face 12 of the fan blade 100. The grooves 20 also penetrate through the first surface 10 and the second surface 11, and a protrusion 30 is formed between any two adjacent grooves 20. Here, the term "a plurality" means three or more. The plurality of grooves 20 are arranged in sequence along the extending direction of the long end face 12. Specifically, the two long end faces 12 are the first long end face 15 and the second long end face 16 respectively. Please refer to Figure 7 , Figure 7 is Figure 3 Schematic diagram of the first specific embodiment of the arrangement of the grooves 20 and protrusions 30 of the fan blade 100 of the centrifugal fan 500 shown in [reference]. In the first specific embodiment, the grooves 20 and protrusions 30 can be provided only on the first long end face 15. Please refer to Figure 8 , Figure 8 is Figure 3 Schematic diagram of the second specific embodiment of the arrangement of the grooves 20 and protrusions 30 of the fan blade 100 of the centrifugal fan 500 shown in [reference]. In the second specific embodiment, the grooves 20 and protrusions 30 can be provided only on the second long end face 16. Please refer to Figure 9 , Figure 9 is Figure 3 Schematic diagram of the third specific embodiment of the arrangement of the grooves 20 and protrusions 30 of the fan blade 100 of the centrifugal fan 500 shown in [reference]. In the third specific embodiment, the grooves 20 and protrusions 30 are provided on both the first long end face 15 and the second long end face 16.
[0055] When the centrifugal fan 500 operates, eddy current noise will be generated. Eddy current noise is also called turbulent noise. It is mainly when the airflow splits at the interface of the fan blade 100, forming a boundary layer and vortex splitting and detachment, which causes the pressure pulsation on the fan blade 100 and radiates an unstable flow noise. And generally, the larger the eddy current, the greater the noise, and the smaller the eddy current, the smaller the noise.
[0056] Please refer to Figure 10 , Figure 10It is the eddy current distribution diagram when the fan blade 100 is not provided with the groove 20 and the protrusion 30. It can be seen that when the fan blade 100 is not provided with the groove 20 and the protrusion 30, when the centrifugal fan runs, the air flow enters the centrifugal fan along the thickness direction of the fan blade 100, then flows in the flow channel and can flow along the first surface, the second surface and the two long end faces, and finally flows out of the centrifugal fan in the direction perpendicular to the thickness of the fan blade. When the groove and the protrusion are not provided, the eddy current generated by the air flow flowing in the centrifugal fan is relatively large. Specifically, there is a large eddy current a at the long end face 12 of the fan blade 100, which leads to obvious noise. Please refer to Figure 11 , Figure 11 It is the eddy current distribution diagram when the fan blade 100 is provided with the groove 20 and the protrusion 30. In this embodiment, by providing the groove 20 and the protrusion 30 at the long end face 12, the relatively large eddy current generated by the air flow flowing in the centrifugal fan is broken up. That is, when the eddy current flows through the groove 20 and the protrusion 30, it is divided by the protrusion 30 into discrete flows b located in a plurality of grooves 20. The discrete flow b is significantly smaller than the large eddy current a. Therefore, when the centrifugal fan 500 runs, the noise brought by the eddy current is significantly reduced, thereby achieving the purpose of noise reduction.
[0057] With the development trend of the thin and light of notebook computers, the space of the installation cavity 414 of the notebook computer is very limited. Therefore, higher requirements are put forward for the thin and light of the centrifugal fan 500, and accordingly the volume of the fan blade 100 is also very small. Generally, the length of the fan blade 100 is less than or equal to 150 mm, for example, it can be 150 mm, 130 mm, 110 mm, 100 mm, 90 mm, 80 mm, 70 mm, 60 mm, 50 mm, 40 mm or 30 mm, etc. The width of the fan blade 100 is less than or equal to 15 mm, for example, it can be 15 mm, 13 mm, 11 mm, 9 mm, 7 mm, 5 mm or 3 mm, etc. When the small-volume centrifugal fan 500 works, the eddy current is larger at the part of the fan blade 100 closer to the hub 520 and smaller at the part farther from the hub 520. And the larger the eddy current, the greater the generated noise, and the smaller the eddy current, the smaller the generated noise. The part of the fan blade 100 closer to the hub 520 does less work, and the part farther from the hub 520 does less work. And the greater the work done, the greater the air volume blown out by the centrifugal fan 500, and the smaller the work done, the smaller the air volume blown out by the centrifugal fan 500.
[0058] For the above reasons, please refer to Figure 12 and Figure 13 , Figure 12 It is the structural schematic diagram of another fan blade 100 provided by the embodiment of the present application. Figure 13 is Figure 12An enlarged schematic diagram at point A of . In some embodiments, along the direction from the first short end face 13 to the second short end face 14, the depth of the plurality of grooves 20 gradually decreases, and the height H1 of the plurality of protrusions 30 gradually decreases. The depth of the groove 20 is the dimension of the groove 20 along the width direction of the fan blade 100, and the height of the protrusion 30 is the dimension of the protrusion 30 along the width direction of the fan blade 100. More specifically, the protrusion 30 includes a top 31 and a bottom 32, the top 31 being the side of the protrusion 30 flush with the long end face 12, and the bottom 32 being the side of the protrusion 30 away from the long end face 12. The height of the protrusion 30 refers to the dimension of the vertical line from the top 31 of the protrusion 30 to the bottom 32 of the protrusion 30. That is, the closer the groove 20 is to the hub 520, the deeper its depth is, and correspondingly, the closer the protrusion 30 is to the hub 520, the higher its height is. As a result, the grooves 20 and protrusions 30 near the hub 520 can break up large eddies close to the hub 520, significantly reducing noise. The grooves 20 and protrusions 30 far from the hub 520 can both break up small eddies farther from the hub 520, reducing noise, and reduce the effect of the grooves 20 on the workmanship of the fan blades 100, ensuring sufficient cooling airflow for the centrifugal fan 500.
[0059] In some embodiments, the width K of the plurality of protrusions 30 gradually decreases along the direction from the first short end face 13 to the second short end face 14, and the width of the protrusion 30 is the size of the protrusion 30 along the length direction of the fan blade 100. More specifically, the width of the protrusion 30 refers to the size of the bottom 32. That is, the closer the protrusion 30 is to the hub 520, the wider its width is, and the farther the protrusion 30 is from the hub 520, the narrower its width is. As a result, the grooves 20 and protrusions 30 close to the hub 520 can break up the large vortices close to the hub 520 to significantly reduce noise. The protrusions 30 away from the hub 520 can not only break up the small vortices far from the hub 520 to reduce noise, but also reduce the impact of the grooves 20 on the workmanship of the fan blade 100, so that the centrifugal fan 500 has sufficient heat dissipation air volume.
[0060] In a specific embodiment, the width and height of the plurality of protrusions 30 gradually decrease along the direction from the first short end surface 13 to the second short end surface 14 .
[0061] Of course, in other embodiments, multiple protrusions 30 may be provided with the same shape, height and width to facilitate processing.
[0062] In some embodiments, the width of the protrusion 30 from the top 31 to the bottom 32 remains constant or gradually increases. The top 31 of the protrusion 30, i.e., the protrusion 30 and the long end surface 12 face the same side, and the bottom 32 of the protrusion 30, i.e., the side of the protrusion 30 away from the long end surface 12. For example, please refer to Figure 14 , Figure 14It is a schematic diagram of the shape of the protrusion 30 of the fan blade 100 provided by an embodiment of the present application. The shape of the protrusion 30 is any one of a triangle, a square, a rectangle, a trapezoid, or a semi-circle.
[0063] Referring to Table 1 below, the noise benefits of the fan blade 100 when the protrusion 30 is a triangle and a trapezoid are shown in Table 1.
[0064]
[0065] As can be seen from Table 1, when the centrifugal fan is operating and the air flow rate is 2.14 CFM, if the fan blade 100 is not provided with a protrusion, the noise is 35 db; if the fan blade 100 is provided with a triangular protrusion, the noise is 34.8 db, and the noise benefit at this time is 0.2 db; if the fan blade 100 is provided with a trapezoidal protrusion, the noise is 34.35 db, and the noise benefit at this time is 0.65 db. When the centrifugal fan is operating and the air flow rate is 2.3 CFM, if the fan blade 100 is not provided with a protrusion, the noise is 37 db; if the fan blade 100 is provided with a triangular protrusion, the noise is 36.7 db, and the noise benefit at this time is 0.3 db; if the fan blade 100 is provided with a trapezoidal protrusion, the noise is 36.2 db, and the noise benefit at this time is 0.8 db. It can be seen that as the air flow rate increases, the noise benefit of the fan blade 100 provided with a protrusion will also increase accordingly, thereby reducing the noise of the centrifugal fan.
[0066] If the width of the top 31 of the protrusion 30 is greater than the width of the bottom 32, when processing the fan blade 100 using a mold, the bottom 32 of the protrusion 30 will get stuck and prevent demolding. In the embodiment of the present application, setting the width of the protrusion 30 to remain unchanged or gradually increase can prevent the protrusion 30 from getting stuck during demolding, thereby facilitating demolding.
[0067] In some embodiments, along the length direction of the fan blade 100, both the protrusion 30 and the groove 20 have a gap with the first short end face 13. Thereby, the first short end face 13 can have sufficient structural strength, enabling the fan blade 100 to be reliably connected to the hub 520.
[0068] In some embodiments, please refer to Figure 15 , Figure 15 is Figure 7 a schematic structural diagram of the first specific implementation manner of the first specific embodiment of the fan blade 100 shown in
[0069] Please refer to Figure 16 , Figure 16 is Figure 3 is Figure 2Schematic structural diagram of the centrifugal fan of the electronic device shown. Along the thickness direction of the centrifugal fan 500, the first part 10A and the hub 520 both face the air outlet 512, and the second part 10B is in a hidden state. Here, the hidden state is referenced by the front view of the centrifugal fan 500 ( Figure 5 ), and the second part 10B is blocked by the top wall 511 and is in an invisible state. The long end face 12 includes a first sub-end face 17 and a second sub-end face 18. The first short end face 13 and the first sub-end face 17 are located on the first part 10A, and the second short end face 14 and the second sub-end face 18 are located on the second part 10B.
[0070] A plurality of protrusions 30 are provided on the first sub-end face 17 and / or the second sub-end face 18. Please refer to Figure 15 , in the first specific embodiment, a plurality of protrusions 30 are all provided on the first sub-end face 17A of the first long end face 15. Please refer to Figure 17 , Figure 17 is Figure 7 Schematic structural diagram of the second specific embodiment of the first specific embodiment of the fan blade shown in. In the second specific embodiment, a plurality of protrusions 30 are all provided on the second sub-end face 18A of the first long end face 15. In the third specific embodiment, a plurality of protrusions 30 are provided on the first sub-end face 17B of the second long end face 16. In the fourth specific embodiment, a plurality of protrusions 30 are provided on the second sub-end face 18B of the second long end face 16. In the fifth specific embodiment, a plurality of protrusions 30 are provided on the first sub-end face 17A of the first long end face 15 and the first sub-end face 17B of the second long end face 16. In the sixth specific embodiment, a plurality of protrusions 30 are provided on the second sub-end face 18A of the first long end face 15 and the second sub-end face 18B of the second long end face 16. In the seventh specific embodiment, a plurality of protrusions 30 are provided on the first sub-end face 17A of the first long end face 15 and the second sub-end face 18B of the second long end face 16. In the eighth specific embodiment, a plurality of protrusions 30 are provided on the second sub-end face 18A of the first long end face 15 and the first sub-end face 17B of the second long end face 16. In the ninth specific embodiment, a plurality of protrusions 30 are provided on the first sub-end face 17A of the first long end face 15 and the second sub-end face 18A of the first long end face 15.
[0071] It can be understood that the centrifugal fan includes a plurality of fan blades 100. Among the plurality of fan blades 100, the positions where the grooves 20 and the protrusions 30 of each fan blade 100 are provided can be the same. In other embodiments, the grooves 20 and the protrusions 30 of some of the fan blades 100 can also be located on the first long end face 15, and can be specifically distributed on the first sub-end face 17A and / or the second sub-end face 18A. For the other part of the fan blades 100, the grooves 20 and the protrusions 30 are located on the second long end face 16, and can be specifically distributed on the first sub-end face 17B and / or the second sub-end face 18B.
[0072] As mentioned above, the part of the fan blade 100 closer to the hub 520 does less work, and the part farther from the hub 520 also does less work. Moreover, the greater the work done, the greater the air volume blown out by the centrifugal fan 500, and the smaller the work done, the smaller the air volume blown out by the centrifugal fan 500. Among them, the part of the fan blade 100 close to the hub 520 is the first part 10A, and the part of the fan blade 100 far from the hub 520 is the second part 10B. That is to say, the work done by the first part 10A is less than that of the second part 10B. Therefore, the first part 10A is the auxiliary work part, and the second part 10B is the core work part. In view of this, the height of the protrusion 30 provided on the first sub-end face 17 is greater than the height of the protrusion 30 provided on the second sub-end face 18, and / or the width of the protrusion 30 provided on the first sub-end face 17 is greater than the width of the protrusion 30 provided on the second sub-end face 18. Thus, the noise of the first part 10A can be greatly reduced, and on the premise that the work done by the second part 10B is guaranteed, the noise of the second part 10B can also be reduced.
[0073] In some embodiments, along the direction from the first short end face 13 to the second short end face 14, the depths of the plurality of grooves 20 provided on the first sub-end face 17 gradually decrease, and the heights of the plurality of protrusions 30 provided on the first sub-end face 17 gradually decrease. And / or, the widths of the plurality of grooves 20 provided on the first sub-end face 17 gradually decrease, and the widths of the plurality of protrusions 30 provided on the first sub-end face 17 gradually decrease. Thereby, it can not only break up the large eddy currents in the first part 10A to reduce noise, but also prevent the work done by the first part 10A from being lost too much.
[0074] In some other embodiments, the depths of the plurality of grooves 20 provided on the first sub-end face 17 are the same, and the heights of the plurality of protrusions 30 provided on the first sub-end face 17 are the same. And / or, the widths of the plurality of grooves 20 provided on the first sub-end face 17 are the same, and the widths of the plurality of protrusions 30 provided on the first sub-end face 17 are the same.
[0075] In some embodiments, along the direction from the first short end face 13 to the second short end face 14, the depths of the plurality of grooves 20 provided on the second sub-end face 18 gradually decrease, and the heights of the plurality of protrusions 30 provided on the second sub-end face 18 gradually decrease. And / or, the widths of the plurality of grooves 20 provided on the second sub-end face 18 gradually decrease, and the widths of the plurality of protrusions 30 provided on the second sub-end face 18 gradually decrease. Thereby, it can not only break up the eddy currents in the second part 10B to reduce noise, but also prevent the work done by the second part 10B from being lost too much.
[0076] In some other embodiments, the depths of the plurality of grooves 20 provided on the second sub-end face 18 are the same, and the heights of the plurality of protrusions 30 provided on the second sub-end face 18 are the same. And / or, the widths of the plurality of grooves 20 provided on the second sub-end face 18 are the same, and the widths of the plurality of protrusions 30 provided on the second sub-end face 18 are the same.
[0077] In some embodiments, the width of the first part 10A is greater than the width of the second part 10B. In other embodiments, the width of the first part 10A may also be set to be less than or equal to the width of the second part 10B.
[0078] In some embodiments, please refer to Figure 18 , Figure 18 FIG. is a schematic diagram of the shape parameters and position parameters of the protrusions of the fan blade provided by the embodiments of the present application. The control parameters of the protrusion 30 include position parameters and shape parameters. That is, after determining the shape of the protrusion 30, multiple protrusions 30 can be accurately machined on the fan blade 100 by combining the position parameters and shape parameters. As mentioned above, the shape of the protrusion 30 can be any one of a triangle, a square, a rectangle, a trapezoid, or a semi-circle. Taking the shape of the protrusion 30 as a triangle as an example, the position parameters of the protrusion 30 mainly include the periodic pitch and the lower side pitch. Among them, the periodic pitch λ = the lower side pitch b + the maximum width of the shape (that is, the width of the bottom of the protrusion 30). The minimum size of the lower side pitch b is limited by the processing accuracy. The periodic pitch is determined according to the length of the area occupied by the protrusion 30 and the groove 20 on the long end face 12 and the number of protrusions 30 planned to be arranged. The periodic pitch can also be understood as the opening width dimension of the groove 20. The lower side pitch can also be understood as the width dimension of the arc bottom 32 of the groove 20.
[0079] Please refer to Figure 19 , Figure 19 FIG. is a columnar comparison chart of the noise simulation of the fan blade 100. Figure 19 FIG. shows a columnar comparison chart among the noise of the fan blade 100 without the protrusions 30 and the grooves 20, the noise of the fan blade 100 when the height and width of the multiple protrusions 30 remain unchanged, and the noise of the fan blade 100 when the height and width of the multiple protrusions 30 gradually decrease when λ / b = 11.49. Among them, the column chart S1 represents the noise of the fan blade 100 without the protrusions 30 and the grooves 20, the column chart S2 represents the noise of the fan blade 100 when the height and width of the multiple protrusions 30 remain unchanged, and the column chart S3 represents the noise of the fan blade 100 when the height and width of the multiple protrusions 30 gradually decrease. As can be seen from Figure 19 FIG., the noise of the fan blade 100 without the protrusions 30 and the grooves 20 is greater than 23 dB. When the widths and heights of the multiple protrusions 30 are the same, the noise of the fan blade 100 is between 22 dB and 23 dB. When the height and width of the multiple protrusions 30 gradually decrease, the noise of the fan blade 100 is between 21 dB and 22 dB. As can be seen from Figure 19 FIG., compared with the fan blade 100 without the protrusions 30 and the grooves 20, setting the grooves 20 and the protrusions 30 on the fan blade 100 can significantly reduce the noise of the fan blade 100.
[0080] Among the shape parameters of the protrusion 30, the more important one is the height H1 of the protrusion 30. In some embodiments, the width of the fan blade 100 is K1, and the height of the protrusion 30 is H1. K1 and H1 satisfy the following condition: H1 ≤ 0.5K1. For example, H1 = 0.5K1, H1 = 0.4K1, H1 = 0.3K1, H1 = 0.2K1, H1 = 0.15K1, H1 = 0.1K1. Specifically, H1 can be 0.085 mm. The height of the protrusion 30 is the dimension of the protrusion 30 along the width direction of the fan blade 100. Thus, it can not only make the protrusion 30 and the groove 20 break up the eddy current, but also prevent excessive loss of the work done by the fan blade 100.
[0081] The above are only some embodiments and implementation manners of the present application. The protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application, and all should be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims
1. A centrifugal fan, characterized in that, It includes a hub and a plurality of fan blades; the plurality of fan blades are fixedly spaced along the circumferential direction of the hub and fixed to the hub; The fan blade includes a first surface, a second surface, two long end faces, a first short end face and a second short end face. The first surface and the second surface face away from each other in the thickness direction of the fan blade. The two long end faces, the first short end face and the second short end face are all connected between the first surface and the second surface. One of the long end faces, the first short end face, the other long end face and the second short end face are connected end to end in sequence. The two long end faces face away from each other in the width direction of the fan blade, and the first short end face and the second short end face face away from each other in the length direction of the fan blade; the first short end face of the fan blade is fixedly connected to the outer peripheral edge of the hub; along the circumferential direction of the hub, the first surface of any fan blade is spaced opposite to the second surface of the adjacent fan blade; The fan blade is provided with a plurality of grooves, the grooves are recessed in at least one of the long end faces and penetrate through the first surface and the second surface, and a protrusion is formed between any two adjacent grooves; the plurality of grooves are arranged in sequence along the extending direction of the long end face.
2. The centrifugal fan according to claim 1, wherein Along the direction from the first short end face to the second short end face, the depths of the plurality of grooves gradually decrease, and the heights of the plurality of protrusions gradually decrease; the depth direction of the groove is the same as the width direction of the fan blade, and the height direction of the protrusion is the same as the width direction of the fan blade.
3. The centrifugal fan according to claim 2, wherein, Along the direction from the first short end face to the second short end face, the widths of the plurality of protrusions gradually decrease, and the width direction of the protrusion is the same as the length direction of the fan blade.
4. The centrifugal fan according to claim 1, characterized in that, The width dimension of the protrusion remains unchanged or gradually increases from the top to the bottom. The top of the protrusion has the same direction as the opening of the groove, and the top of the protrusion has the same direction as the bottom surface of the groove.
5. The centrifugal fan according to claim 4, wherein, The shape of the protrusion is any one of a triangle, a square, a rectangle, a trapezoid or a semi-circle.
6. The centrifugal fan according to any one of claims 1 to 5, characterized in that The centrifugal fan further includes a volute. The volute is provided with a receiving cavity, an air inlet and an air outlet. The air inlet and the air outlet are both communicated with the receiving cavity, and the planes where the air inlet and the air outlet are located are perpendicular to each other; The fan blade and the hub are both arranged in the receiving cavity; the rotation central axis of the hub is perpendicular to the plane where the air outlet is located; the fan blade includes a first part and a second part fixed along its length direction. Along the thickness direction of the centrifugal fan, the first part and the hub both face the air outlet, and the second part is in a hidden state; The long end face includes a first sub-end face and a second sub-end face; along the extending direction of the long end face, the first sub-end face and the second sub-end face are connected. The first sub-end face faces the air outlet, and the second sub-end face is in a hidden state relative to the air outlet; The plurality of protrusions are arranged on the first sub-end face and / or the second sub-end face.
7. The centrifugal fan according to any one of claims 1 to 5, characterized in that, The width of the fan blade is K1, and the height of the protrusion is H1. K1 and H1 satisfy the following conditions: H1≤0.5K1; the height direction of the protrusion is the same as the width direction of the fan blade.
8. The centrifugal fan according to any one of claims 1 to 5, characterized in that, The fan blade is a straight blade, a forward-curved blade or a backward-curved blade.
9. The centrifugal fan according to claim 1, wherein The shapes, heights and widths of the plurality of the protrusions are the same.
10. An electronic device, characterized in that, Comprising: A housing and a heat dissipation device, wherein the housing is provided with an installation cavity, a ventilation opening and a heat dissipation opening communicating with the installation cavity, the heat dissipation device is arranged in the installation cavity, the heat dissipation device comprises the fan according to any one of claims 1 to 9, an air inlet of the fan faces the ventilation opening, and an air outlet of the fan faces the heat dissipation opening.