Centrifugal fan impeller and centrifugal fan
By imitating the structural design of eagle owl wings on the centrifugal fan impeller, using a serrated leading edge, cylindrical protrusions and gradient hole structure, the high-frequency noise problem of the centrifugal fan is solved, and broadband noise suppression and improved aerodynamic efficiency are achieved.
Patent Information
- Application Number
- CN202511051305.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-29
- Publication Date
- 2025-09-09
AI Technical Summary
Existing centrifugal fan impellers generate high-frequency discrete noise during operation, which is difficult to effectively reduce.
The bionic eagle owl wing design is adopted. By setting a serrated structure on the leading edge of the fan blade and a cylindrical protrusion on the inner side of the curve, combined with the gradient porous structure and stiffness gradient blade of the trailing edge, vortex discretization and turbulent premixing are achieved, thereby reducing operating noise.
It effectively reduces the operating noise of centrifugal fans, especially in the wide frequency range of 500-4000Hz, improves aerodynamic efficiency and avoids resonance noise.
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Figure CN120608886A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of centrifugal fans, and in particular to a centrifugal fan impeller and a centrifugal fan. Background Art
[0002] Existing centrifugal fan impellers all use blades of uniform thickness, and their leading and trailing edges are both smoothed. This structural setting causes the existing centrifugal fan to generate high-frequency discrete noise during operation. Summary of the Invention
[0003] The purpose of the present invention includes providing a centrifugal fan impeller and a centrifugal fan, which can discretize vortices and trigger turbulent premixing through the serrated structure of the leading edge of the fan blade and multiple columnar protrusions on the curved inner side of the fan blade, thereby reducing its operating noise.
[0004] The embodiments of the present invention can be implemented as follows: In a first aspect, the present invention provides a centrifugal fan impeller, comprising a main body and a plurality of fan blades, wherein the plurality of fan blades are connected to the main body and are sequentially spaced around an axis of the main body; Each fan blade is curved, and the leading edge of each fan blade is provided with a serrated structure along the extension direction of its contour, and a plurality of columnar protrusions are arranged in an array on the inner side of the curve of the fan blade, and the plurality of columnar protrusions are adjacent to the leading edge of the fan blade.
[0005] In an optional embodiment, the sawtooth structure includes a plurality of tooth-shaped portions, the plurality of tooth-shaped portions are arranged along the extension direction of the profile of the leading edge, the tooth pitch between two adjacent tooth-shaped portions is 4 mm ± 0.5 mm, the tooth height of the tooth-shaped portions is 0.8 mm-1.5 mm, and the root of the tooth-shaped portion is provided with a circular chamfer with a radius of 0.2 mm-0.5 mm; Among them, multiple tooth-shaped portions are all asymmetric tooth shapes; or, some of the multiple tooth-shaped portions are asymmetric tooth shapes, and the remaining tooth-shaped portions are all symmetric tooth shapes, and the multiple tooth-shaped portions with asymmetric tooth shapes are located on the same side of the fan blade, and the multiple tooth-shaped portions with symmetric tooth shapes are located on the same side of the fan blade.
[0006] In an optional embodiment, the diameter of the columnar protrusion is 0.1 mm-0.5 mm, the height of the columnar protrusion is 0.2 mm-0.7 mm, and the distance between two adjacent columnar protrusions is 0.3 mm-1 mm.
[0007] In an optional embodiment, a first hole array, a second hole array, and a third hole array are arranged on the inner side of the curve of the fan blade and near the trailing edge thereof; Along the direction from the leading edge to the trailing edge, the first hole array, the second hole array and the third hole array are arranged in sequence; Among them, the holes combined into the first hole array are honeycomb holes; the holes combined into the second hole array are round holes; and the holes combined into the third hole array are strip holes.
[0008] In an optional embodiment, the honeycomb holes and the strip holes all pass through the through holes of the fan blades, and the round holes are blind holes.
[0009] In an optional embodiment, the honeycomb hole has a side-to-side distance of 0.3 mm; the circular hole has a diameter of 0.8 mm and a depth of 0.6 mm; the strip hole has a length of 3 mm and a width of 1.2 mm, and is inclined at 15°±0.5°.
[0010] In an optional embodiment, the fan blade includes a proximal region, a middle region, and a terminal region along the direction from the leading edge to the trailing edge; the first hole array is located in the proximal region, the second hole array is located in the middle region, and the third hole array is located in the terminal region; Among them, the porosity of the proximal zone is 30%-50%, and the wall thickness of the honeycomb hole is 0.05mm; the porosity of the middle zone is 50%-70%; and the porosity of the terminal zone is 70%-85%.
[0011] In an optional embodiment, the fan blade has a thickness that gradually decreases from its blade root to its blade tip; The difference between the thickness of the root section of the fan blade and the thickness of the tip section thereof is 0.5 mm to 1.2 mm.
[0012] In an optional embodiment, the thickness of the root section of the fan blade is 1.4 mm to 1.9 mm, and the thickness of the tip section thereof is 0.5 mm to 1 mm.
[0013] In a second aspect, the present invention provides a centrifugal fan, which includes a centrifugal fan impeller as described in the aforementioned embodiment.
[0014] The centrifugal fan impeller and the centrifugal fan provided by the embodiments of the present invention have the following beneficial effects: This centrifugal fan impeller includes a main body and multiple fan blades, each of which is connected to the main body and spaced apart around the main body's axis. Each fan blade is curved, and the leading edge of each fan blade is provided with a serration structure along the extension direction of its profile. Multiple columnar protrusions are arranged in an array on the inner side of the curved blades, and the multiple columnar protrusions are adjacent to the leading edge of the fan blades. This centrifugal fan impeller is used in centrifugal fans. Through the serration structure on the leading edge of the fan blades and the multiple columnar protrusions on the inner side of the curved blades, it can discretize vortices and trigger turbulent premixing, thereby reducing operating noise. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.
[0016] Figure 1 A schematic structural diagram of a centrifugal fan impeller provided in this embodiment; Figure 2 A schematic diagram of the structure of the fan blade provided in this embodiment from a first perspective; Figure 3 This is a schematic structural diagram of the fan blade provided in this embodiment from a second viewing angle.
[0017] Icons: 100- centrifugal fan impeller; 200- main body; 300- fan blade; 301- leading edge; 302- trailing edge; 310- serrated structure; 320- columnar protrusion; 311- tooth-shaped portion; 330- first hole array; 340- second hole array; 350- third hole array; 331- honeycomb hole; 341- circular hole; 351- strip hole; 361- proximal region; 362- middle region; 363- terminal region. DETAILED DESCRIPTION
[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.
[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.
[0020] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.
[0021] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.
[0022] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.
[0023] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.
[0024] Existing centrifugal fan impellers all use blades of uniform thickness, and their leading and trailing edges are both smoothed. This structural setting causes the existing centrifugal fan to generate high-frequency discrete noise during operation.
[0025] The inventors have discovered through research that the flying feathers of the eagle owl (Bubo bubo) have a special structure with serrated edges, which can effectively reduce flight noise, achieve "silent flight", and facilitate night hunting. Based on this, this embodiment proposes a centrifugal fan impeller that mimics the wings of the eagle owl. The impeller achieves broadband noise suppression and improved aerodynamic efficiency through the coordinated design of the serrated-down feather composite structure at the leading edge, the gradient porous structure at the trailing edge, and the stiffness gradient blades.
[0026] For details, please refer to Figure 1-Figure 3 This embodiment provides a centrifugal fan impeller 100, which includes a main body 200 and a plurality of fan blades 300. The plurality of fan blades 300 are connected to the main body 200, and the plurality of fan blades 300 are sequentially spaced around the axis of the main body 200. Each fan blade 300 is curved, and the leading edge 301 of each fan blade 300 is provided with a serrated structure 310 along the extension direction of its contour, and a plurality of columnar protrusions 320 are arranged in an array on the inner side of the curve of the fan blade 300, and the plurality of columnar protrusions 320 are adjacent to the leading edge 301 of the fan blade 300.
[0027] Please refer to Figure 1-Figure 3 The working principle of the centrifugal fan impeller 100 is: The centrifugal fan impeller 100 includes a main body 200 and a plurality of fan blades 300 . The plurality of fan blades 300 are connected to the main body 200 , and the plurality of fan blades 300 are sequentially spaced around the axis of the main body 200 . Each fan blade 300 is curved, and a sawtooth structure 310 is provided on the leading edge 301 of each fan blade 300 along the extension direction of its outline. A plurality of columnar protrusions 320 are arranged in an array on the inner side of the curve of the fan blade 300, and the plurality of columnar protrusions 320 are adjacent to the leading edge 301 of the fan blade 300. Therefore, through the above-mentioned structural setting, the centrifugal fan impeller 100 forms a serrated down composite structure on the leading edge 301 by imitating the asymmetric serrations (taking its wavelength as an example of 4 mm) on the leading edge 301 of the primary flight feathers of the eagle owl and the secondary down microfiber clusters (taking its diameter as an example of 0.3 mm), that is, including a serrated structure 310 arranged on the leading edge 301 of the fan blade 300 and a plurality of columnar protrusions 320 on the curved inner side of the fan blade 300. Therefore, when it is applied to a centrifugal fan, the serrated structure 310 on the leading edge 301 and the plurality of columnar protrusions 320 can discretize vortices and trigger turbulent premixing through the serrated structure 310 on the leading edge 301, thereby reducing its operating noise.
[0028] Furthermore, the sawtooth structure 310 includes a plurality of tooth-shaped portions 311 arranged along the contour extension direction of the leading edge 301, with a pitch of 4 mm ± 0.5 mm between adjacent tooth-shaped portions 311. This is intended to mimic the asymmetric sawtooth formations on the leading edge 301 of an eagle owl's primary flight feathers, taking a wavelength of 4 mm as an example. The tooth height of the tooth-shaped portions 311 ranges from 0.8 mm to 1.5 mm, and the root of the tooth-shaped portion 311 is provided with a rounded chamfer with a radius of 0.2 mm to 0.5 mm. This is intended to mimic the microfiber clusters of an eagle owl's secondary down feathers, taking a diameter of 0.3 mm as an example. That is, when configuring multiple tooth-shaped portions 311, they imitate the asymmetric serrations of the leading edge 301 of the primary flight feather of the eagle owl. Therefore, the tooth pitch between two adjacent tooth-shaped portions 311 can be 4 mm ± 0.5 mm. Specifically, the tooth pitch between two tooth-shaped portions 311 can be 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm or 4.5 mm; and the tooth height of the tooth-shaped portion 311 is set to 0.8 mm. -1.5mm, specifically, the tooth height of the tooth-shaped portion 311 can be 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.5mm; and a circular chamfer with a radius of 0.2mm-0.5mm is provided at the root of the tooth-shaped portion 311, specifically, the radius of the circular chamfer can be 0.2mm, 0.3mm, 0.4mm or 0.5mm; In this embodiment, the tooth pitch between the two tooth-shaped portions 311 is set to 4mm±0.1mm, the tooth height is set to 1.2mm, and the radius of the circular chamfer can be 0.3mm; relative to the asymmetric serrations imitating the leading edge 301 of the primary flight feathers of the eagle owl, it can also be understood that the sawtooth wavelength of the sawtooth structure 310 is 4mm±0.1mm, its radial amplitude is 1.2mm, and the chamfer radius of the sawtooth root is 0.3mm.
[0029] And based on the above structure, please refer to Figure 1-Figure 3 When configuring the tooth-shaped portion, it can be set to a symmetrical tooth shape or an asymmetrical tooth shape according to needs; and since in this embodiment, the leading edge 301 of the fan blade 300 includes two side surfaces on the inner side of the fan blade 300, when the multiple tooth-shaped portions 311 are all set to an asymmetrical tooth shape, they are correspondingly located on the two side surfaces of the leading edge 301 of the fan blade 300; When some of the multiple tooth-shaped portions 311 are asymmetrical and the remaining tooth-shaped portions 311 are symmetrical, the multiple tooth-shaped portions 311 with asymmetrical tooth shapes can be located on the same side of the fan blade 300, and the multiple tooth-shaped portions 311 with symmetrical tooth shapes can be located on the same side of the fan blade 300, that is, one of the two side surfaces of the leading edge 301 of the fan blade 300 is distributed with the multiple tooth-shaped portions 311 with asymmetrical tooth shapes, and the other side surface is distributed with the multiple tooth-shaped portions 311 with symmetrical tooth shapes.
[0030] When configuring multiple columnar protrusions 320, they imitate the secondary down feather microfiber clusters of the leading edge 301 of the primary flight feathers of the eagle owl. This embodiment adopts the method of setting them as cylinders. Specifically, the diameter of the columnar protrusion 320 is 0.1mm-0.5mm, the height of the columnar protrusion 320 is 0.2mm-0.7mm, and the distance between two adjacent columnar protrusions 320 is 0.3mm-1mm.
[0031] From the above content, it can be seen that when configuring the columnar protrusion 320, its diameter can be set to 0.1mm, 0.2mm, 0.3mm, 0.4mm or 0.5mm; and its protrusion distance from the fan blade 300, that is, its height can be set to 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm or 0.7mm; and multiple columnar protrusions 320 are arranged in an array, so when arranging multiple columnar protrusions 320, the distance between two columnar protrusions 320 can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8 mm, 0.9 mm or 1mm.
[0032] Please refer to Figure 1-Figure 3In this embodiment, since the columnar protrusion 320 is configured to imitate the secondary down microfiber cluster of the leading edge 301 of the primary flight feather of the eagle owl, the radial bionic down feathers are distributed in the gaps relative to the above-mentioned serration structure 310, and the single down feather of the bionic down feather has a diameter of 0.3 mm, a height of 0.5 mm, a circumferential spacing of 0.8 mm, and an inclination angle of 45° with the serrations, therefore, in this embodiment, the diameter of the columnar protrusion 320 is set to 0.3 mm, the height is set to 0.2 mm, the spacing between the two columnar protrusions 320 is 0.8 mm, and it forms an angle of 45° with respect to the above-mentioned serrations.
[0033] On the basis of the above structure, since the centrifugal fan in the prior art will generate broadband eddy current noise during operation, the inventors have found through research that the reason is that the vortex shedding at the trailing edge causes broadband noise, and the conventional porous structure is difficult to take into account both low-frequency absorption and high-frequency scattering; based on this, the inventors have proposed a gradient porous structure and a stiffness gradient blade that imitates the trailing edge of the eagle owl's wings, and then through the coordinated design of the serrated-down composite structure of the leading edge 301, the gradient porous structure of the trailing edge 302 and the stiffness gradient blade, broadband noise suppression and aerodynamic efficiency improvement are achieved.
[0034] Based on this, please refer to Figure 1-Figure 3 Based on the aforementioned serration structure 310 on the leading edge 301 of the fan blade 300 and the multiple cylindrical protrusions 320 on the curved inner side of the fan blade 300, this embodiment arranges a first hole array 330, a second hole array 340, and a third hole array 350 on the curved inner side of the fan blade 300, near its trailing edge 302. The first hole array 330, the second hole array 340, and the third hole array 350 are arranged in sequence from the leading edge 301 to the trailing edge 302. The holes forming the first hole array 330 are honeycomb holes 331; the holes forming the second hole array 340 are circular holes 341; and the holes forming the third hole array 350 are strip-shaped holes 351. This arrangement of the three hole arrays achieves broadband noise absorption between 500 and 4000 Hz.
[0035] Moreover, when configuring the above-mentioned three hole arrays, the holes in the first hole array 330 are set as honeycomb holes 331, the holes in the second hole array 340 are set as round holes 341, and the holes in the third hole array 350 are set as strip holes 351. In order to improve the noise absorption effect, the honeycomb holes 331 and the strip holes 351 can both pass through the through holes of the fan blades 300, and the round holes 341 are blind holes.
[0036] In addition to the above structure, when configuring the honeycomb hole 331, it is a hexagonal honeycomb hole 331, and its opposite side distance is 0.3mm; the aperture of the circular hole 341 is 0.8mm, and the hole depth is 0.6mm; the length of the strip hole 351 is 3mm, the width is 1.2mm, and it is set at an inclination of 15°±0.5°.
[0037] In addition, please refer to Figure 1-Figure 3 Based on the three aforementioned hole arrays, this embodiment employs a structure where the fan blade 300, along its leading edge 301 to its trailing edge 302, comprises a proximal region 361, a middle region 362, and a distal region 363. The first hole array 330 is located in the proximal region 361, the second hole array 340 is located in the middle region 362, and the third hole array 350 is located in the distal region 363. The porosity of the proximal region 361 is 30%-50%, and the honeycomb cells 331 have a wall thickness of 0.05 mm. The porosity of the middle region 362 is 50%-70%, and the porosity of the distal region 363 is 70%-85%. This structural arrangement enhances noise absorption.
[0038] The inventors have also discovered that existing blades suffer from the disadvantage of amplifying resonant noise during operation. Specifically, the uniform distribution of blade stiffness easily induces resonance, exacerbating noise in specific frequency bands (e.g., the 1800 Hz modal frequency). Based on this, in this embodiment, the thickness of the fan blade 300 gradually decreases from its root to its tip. The difference between the thickness of the root section and the thickness of the tip section of the fan blade 300 is 0.5 mm to 1.2 mm.
[0039] In this way, the stiffness of the fan blade 300 changes gradually, so that the elastic modulus of the fan blade 300 from the root to the tip can be gradually reduced. Based on the thickness change of this embodiment, the elastic modulus of the fan blade 300 from the root to the tip can be gradually changed from 3.5 GPa to 1.2 GPa, so that the resonance frequency is offset to 1800 Hz, thereby avoiding working excitation.
[0040] Please refer to Figure 1-Figure 3In this embodiment, the thickness of the root section of the fan blade 300 is set to 1.4 mm to 1.9 mm, and the thickness of the tip section is set to 0.5 mm to 1 mm. Specifically, the thickness of the root section can be 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, or 1.9 mm, and the thickness of the tip section can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1 mm. In this embodiment, the thickness of the root section is set to 1.5 mm, and the thickness of the tip section is set to 0.8 mm. That is, the difference between the thickness of the root section and the thickness of the tip section of the fan blade 300 is 0.7 mm.
[0041] Based on the above, please refer to Figure 1-Figure 3 , the operating parameters of the centrifugal fan impeller 100 are compared with the operating parameters of the existing impeller, and the following data comparison table 1 is obtained:
[0042] Table 1 In summary, combined with the above content and the data in Table 1, it can be seen that this embodiment provides a centrifugal fan impeller 100, which, by imitating the wings of a bionic eagle owl, further proposes the above-mentioned serrated structure 310 of the leading edge 301 of the fan blade 300, multiple columnar protrusions 320 on the curved inner side of the fan blade 300, multiple hole arrays on the trailing edge 302 of the fan blade 300, and the thickness variation of the fan blade 300 from its blade root to its blade tip. Based on the above-mentioned structural settings, it can achieve broadband noise suppression and aerodynamic efficiency improvement through the coordinated design of the serrated-down composite structure of the leading edge 301, the gradient porous structure of the trailing edge 302, and the stiffness gradient blade. Specifically including: Bionic hierarchical noise reduction: The serrated structure 310 on the leading edge 301 disperses vortices to mimic the primary flight feathers of an eagle owl; while the gradient pore array on the trailing edge 302 dissipates energy to mimic the pore distribution of secondary flight feathers; Aeroacoustic coupling design: Multiple cylindrical protrusions 320 on the leading edge 301 simulate down feathers to trigger micro-vortex premixing, reducing suction surface separation noise; while the honeycomb foam strip holes on the trailing edge 302 achieve broadband noise reduction. The stiffness gradient shifts the resonant frequency away from the operating excitation.
[0043] Based on the above, please refer to Figure 1-Figure 3 This embodiment further provides a centrifugal fan, which includes the centrifugal fan impeller 100 of the aforementioned embodiment. By adopting the aforementioned centrifugal fan impeller 100, the centrifugal fan has all the advantages of the aforementioned centrifugal fan impeller 100, which will not be described in detail here.
[0044] The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or replacements that can be easily conceived by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.
Claims
1. A centrifugal fan impeller, characterized in that: The centrifugal fan impeller includes a main body and a plurality of fan blades, wherein the plurality of fan blades are connected to the main body and are sequentially spaced around the axis of the main body; Each of the fan blades is curved, and the leading edge of each fan blade is provided with a serrated structure along the extension direction of its contour, and a plurality of columnar protrusions are arranged in an array on the inner side of the curve of the fan blade, and the plurality of columnar protrusions are adjacent to the leading edge of the fan blade.
2. The centrifugal fan impeller according to claim 1, characterized in that: The sawtooth structure includes a plurality of tooth-shaped portions, which are arranged along the extension direction of the contour of the leading edge, and the tooth pitch between two adjacent tooth-shaped portions is 4 mm ± 0.5 mm, the tooth height of the tooth-shaped portion is 0.8 mm-1.5 mm, and the root of the tooth-shaped portion is provided with a circular chamfer with a radius of 0.2 mm-0.5 mm; Among them, multiple tooth-shaped portions are all asymmetric tooth shapes; or, some of the multiple tooth-shaped portions are asymmetric tooth shapes, and the remaining tooth-shaped portions are all symmetric tooth shapes, and the multiple tooth-shaped portions with asymmetric tooth shapes are located on the same side of the fan blade, and the multiple tooth-shaped portions with symmetric tooth shapes are located on the same side of the fan blade.
3. The centrifugal fan impeller according to claim 2, characterized in that: The diameter of the columnar protrusion is 0.1 mm to 0.5 mm, the height of the columnar protrusion is 0.2 mm to 0.7 mm, and the distance between two adjacent columnar protrusions is 0.3 mm to 1 mm.
4. The centrifugal fan impeller according to claim 1, characterized in that: A first hole array, a second hole array, and a third hole array are arranged on the inner side of the curve of the fan blade and near the trailing edge thereof; Along the direction from the leading edge to the trailing edge thereof, the first hole array, the second hole array, and the third hole array are arranged in sequence; Among them, the holes combined into the first hole array are honeycomb holes; the holes combined into the second hole array are round holes; and the holes combined into the third hole array are strip holes.
5. The centrifugal fan impeller according to claim 4, characterized in that: The honeycomb holes and the strip holes both pass through the through holes of the fan blades, and the circular holes are blind holes.
6. The centrifugal fan impeller according to claim 5, characterized in that: The honeycomb holes have a side-to-side distance of 0.3 mm; the circular holes have a diameter of 0.8 mm and a depth of 0.6 mm; the strip holes have a length of 3 mm and a width of 1.2 mm, and are inclined at 15°±0.5°.
7. The centrifugal fan impeller according to claim 6, characterized in that: Along the direction from the leading edge to the trailing edge, the fan blade includes a proximal region, a middle region, and a terminal region; the first hole array is located in the proximal region, the second hole array is located in the middle region, and the third hole array is located in the terminal region; The porosity of the proximal region is 30%-50%, and the wall thickness of the honeycomb hole is 0.05 mm; the porosity of the middle region is 50%-70%; and the porosity of the terminal region is 70%-85%.
8. The centrifugal fan impeller according to any one of claims 1 to 7, characterized in that: The fan blade has a thickness that gradually decreases from its blade root to its blade tip; The difference between the thickness of the root section of the fan blade and the thickness of the tip section thereof is 0.5 mm to 1.2 mm.
9. The centrifugal fan impeller according to claim 8, characterized in that: The thickness of the root section of the fan blade is 1.4mm-1.9mm, and the thickness of the tip section is 0.5mm-1mm.
10. A centrifugal fan, characterized in that: The centrifugal fan includes the centrifugal fan impeller as claimed in claim 9.