CN218207193U - Blade for multi-wing centrifugal fan - Google Patents
Blade for multi-wing centrifugal fan Download PDFInfo
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- CN218207193U CN218207193U CN202222225982.7U CN202222225982U CN218207193U CN 218207193 U CN218207193 U CN 218207193U CN 202222225982 U CN202222225982 U CN 202222225982U CN 218207193 U CN218207193 U CN 218207193U
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Abstract
The utility model discloses a multi-wing blade for centrifugal fan, including blade top, blade bottom, blade leading edge and blade trailing edge, be equipped with leading edge sawtooth structure on the blade leading edge, leading edge sawtooth structure extends and the length of leading edge sawtooth structure is 40% of blade height from the top of blade along the direction of height of blade; the suction surface and the pressure surface of the blade are both provided with a plurality of regularly arranged bionic grooves. The utility model discloses a blade can further break the vortex when the operation, controls boundary layer separation phenomenon more effectively, reaches and reduces the aerodynamic noise of multi-wing centrifugal fan, improves the purpose of operating stability.
Description
Technical Field
The utility model belongs to the technical field of fluid machinery and engineering equipment, concretely relates to blade for multi-wing centrifugal fan.
Background
The multi-wing centrifugal fan is widely applied to household appliances such as smoke exhaust ventilator and purifier and various ventilation devices because of its advantages such as high flow coefficient, large pressure coefficient and small size. Along with the improvement of living standard of people in recent years, higher requirements are put forward on living quality and comfortableness, and more rigorous requirements are put forward on the pneumatic performance and the noise of the multi-wing centrifugal fan. How to design a multi-wing centrifugal fan with lower noise becomes a great problem for practitioners in the industry.
The noise sources of the multi-wing centrifugal fan in the operation process comprise aerodynamic noise, mechanical noise and electromagnetic noise, and the aerodynamic noise is far larger than other noise sources. The aerodynamic noise of a fan can be divided into rotational noise and vortex noise according to the generation mechanism. Rotational noise is caused by periodic pressure and velocity pulsations created by the periodic beating of air by the rotating blades; while the vortex noise is caused by the pressure pulsation of the air flow caused by the turbulent boundary layer and its shedding.
The impeller, as a core component of the multi-wing centrifugal fan, has a vital influence on the aerodynamic performance and noise characteristics of the fan. The multi-wing impeller has the advantages that the flow channel is short, the inflow attack angle of the blades is large, boundary layer separation is easily generated on the suction surface close to the front edge of the wing profile in the blade channel, and a large-scale vortex is formed, so that the blade channel is blocked, the aerodynamic noise of a fan is increased, and the operation stability of equipment is reduced. Therefore, the fan blade is optimally designed, so that the fan noise can be obviously reduced, and the fan performance is optimized.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a multi-wing is blade for centrifugal fan, this blade can further break the vortex when the operation, controls boundary layer separation phenomenon more effectively, reaches and reduces the aerodynamic noise of multi-wing centrifugal fan, improves the purpose of operating stability.
The utility model adopts the technical proposal that:
the blade for the multi-wing centrifugal fan comprises a blade top, a blade bottom, a blade front edge and a blade tail edge, wherein a front edge sawtooth structure is arranged on the blade front edge, and a plurality of bionic grooves are formed in the suction surface and the pressure surface of the blade.
The utility model discloses a characteristics still lie in:
the leading edge serration extends from the tip of the blade in the height direction of the blade and the length of the leading edge serration is 40% of the blade height.
The front edge sawtooth structure comprises a plurality of groups of sawtooth noise reduction units, and the sawtooth noise reduction units are formed by sequentially arranging three sine-curve-shaped waveform teeth with different sizes.
The sizes of three waveform teeth in the sawtooth noise reduction unit are respectively as follows: first wave-shaped tooth height S 1 0.8-1.5 mm, tooth width A 1 2-2.6 mm; second wave shape tooth height S 2 3.5-5 mm, tooth width A 2 4-6.5 mm; third waveform tooth height S 3 2-3 mm, tooth width A 3 Is 3-4 mm.
The bionic grooves are regularly arranged on the surface of the blade, and the bionic grooves in two adjacent rows are arranged in a staggered mode.
The bionic groove is in a crescent shape formed by overlapping two arcs with different radiuses, wherein the radius R of a large arc is 3.5-6 mm, the radius R of a small arc is 2.8-4.5 mm, the length L of the bionic groove is 5-8 mm, the depth of the groove is 2-3 mm, and the row spacing C of array arrangement is 5-7 mm.
The utility model has the advantages that:
the front edge sawtooth structure on the blade can break larger vortex close to the front edge of the front disc into small vortex, reduce the vortex at the rear edge and relieve the boundary layer separation phenomenon; and simultaneously, because the utility model discloses the leading edge sawtooth structure of well blade is irregular, and produced pressure pulsation phase angle is inconsistent, so produced stronger exhibition to interfering the effect, has weakened the stack effect of noise source, has reduced the pressure pulsation amplitude of blade leading edge and trailing edge department to fan noise has been reduced. In addition, the bionic groove structure of the suction surface and the pressure surface of the blade can generate a certain effect of delaying flow separation, reduce the resistance borne by the blade, cause turbulent burst at the bottom layer of the groove, influence the development of vortex, reduce the wake vorticity and further reduce the aerodynamic noise of the fan.
Drawings
Fig. 1 is a schematic structural view of a multi-wing centrifugal fan impeller with blades designed by the present invention;
FIG. 2 is a schematic view of the blade of the present invention;
FIG. 3 is a partial cross-sectional view of the blade leading edge serration of the present invention;
fig. 4 is a schematic view of the local arrangement of the bionic grooves of the blades of the present invention.
In the figure, 1, 2, 3, 4, front edge, 5, tail edge, 6, front edge sawtooth structure and 7, bionic grooves are formed.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 shows a multi-blade centrifugal fan impeller assembled by using the blades of the present embodiment, and a blade top 2 and a blade bottom 3 are mounted on the impeller.
The utility model discloses a multi-wing centrifugal fan blade, the structure is as shown in figure 2, including blade top 2, blade bottom 3, blade leading edge 4 and blade trailing edge 5. The blade leading edge 4 is provided with a leading edge sawtooth structure 6, the leading edge sawtooth structure 6 extends from the top end of the blade 1 along the height direction of the blade 1, the length of the leading edge sawtooth structure 6 is 40% of the height of the blade 1, and the other part of the blade leading edge 4 is still a traditional straight leading edge.
As shown in fig. 3, the leading edge sawtooth structure 6 includes a plurality of groups of sawtooth noise reduction units, and the sawtooth noise reduction units are formed by sequentially arranging three sinusoidal waveform teeth with different sizes. The sizes of three waveform teeth in the sawtooth noise reduction unit are respectively as follows: first wave-shaped tooth height S 1 0.8-1.5 mm, tooth width A 1 2-2.6 mm; second wave-shaped tooth height S 2 3.5-5 mm, tooth width A 2 4-6.5 mm; third waveform tooth height S 3 2-3 mm, tooth width A 3 Is 3-4 mm. In this embodiment, the tooth height S of the first waveform is selected 1 Is 1.5mm, the tooth width A 1 Is 2.2mm; second wave shape tooth height S 2 Is 4mm, the tooth width A 2 Is 5.5mm; third waveformTooth height S 3 Is 2mm, the tooth width A 3 Is 3mm.
The suction surface and the pressure surface of the blade 1 are both provided with a plurality of bionic grooves 7. The bionic grooves 7 are regularly arranged on the surface of the blade 1, and the bionic grooves 7 in two adjacent rows are arranged in a staggered mode. As shown in fig. 4, the bionic grooves 7 in this embodiment are arranged in an array, and the single shape and the arranged overall shape of the bionic grooves 7 are similar to the shape of the feather on the wing surface of the carrier pigeon and the distribution shape of the overall feather. Because the shape is irregular, for convenient production, the crescent that is formed by the stack of two different radius circular arcs is simplified, wherein the radius R of orthodrome is 3.5 ~ 6mm, the radius R of orthodrome is 2.8 ~ 4.5mm, the length L of bionical recess 7 is 5 ~ 8mm, the recess depth is 2 ~ 3mm, the row interval C that the array was arranged is 5 ~ 7mm. The specific numerical values in this example are: the radius R of the large circular arc is 5mm, the radius R of the small circular arc is 4mm, the length L of the bionic groove 7 is 7mm, the depth of the groove is 2.5mm, and the row interval C of the array arrangement is 7mm.
The utility model discloses a many wings are blade for centrifugal fan utilizes bionical recess 7 that arranges on leading edge sawtooth structure 6 and 1 suction surface of blade and the pressure surface to reduce the aerodynamic noise of fan operation in-process. In the operation process of the multi-wing centrifugal fan, airflow enters from the air inlet along the axial direction and then is converted into radial flow, and because the axial width of the blades of the multi-wing centrifugal fan is large and the radial flow channels are generally short, the flow separation phenomenon in the blade channels is very obvious and accompanied with a secondary separation phenomenon, the serious flow separation zone accounts for about one third of the axial width of the impeller, so that the noise of the fan is increased, and the operation efficiency is reduced. The utility model discloses according to the actual flow condition of air current in the impeller, arranged leading edge sawtooth structure 6 from the blade top to apart from the 40% leaf height department in blade top on blade leading edge 4, can not too much influence the aerodynamic performance of fan when playing the effect of making an uproar of falling. The front edge sawtooth structure 6 breaks larger eddy generated at the position close to the front edge of the front disc in the running process of the fan into small eddy, so that the eddy at the position of the tail edge 5 of the blade can be effectively reduced, the boundary layer separation phenomenon is relieved, and the high-frequency aerodynamic noise of the fan is reduced; meanwhile, the front edge sawtooth structure 6 is formed by a sawtooth noise reduction unit array formed by sequentially arranging three sine wave-shaped teeth, the shape is irregular, and the phase angles of the generated pressure pulsation are not consistent, so that a strong spanwise interference effect is generated, the superposition effect of a noise source is weakened, the pressure pulsation amplitude at the front edge and the tail edge of the blade is reduced, and the noise of the fan is further reduced. The front edge sawtooth structure 6 and the bionic groove 7 objectively reduce the weight of the impeller, and can reduce the energy consumption of the device. In addition, the bionic grooves 7 on the suction surface and the pressure surface of the blade 1 can generate certain effect of delaying flow separation, and the resistance borne by the blade is reduced; turbulent flow at the bottom of the groove is prior to the surface burst of the blade 1, so that the development of vortex in a blade channel is influenced, the wake vortex quantity is reduced, and the aerodynamic noise of the fan is further reduced.
Claims (6)
1. Blade for multi-wing centrifugal fan, including blade top (2), blade bottom (3), blade leading edge (4) and blade trailing edge (5), its characterized in that is equipped with leading edge sawtooth structure (6) on blade leading edge (4), all be provided with on the suction surface and the pressure surface of blade (1) a plurality of bionical recess (7).
2. The blade for a multi-winged centrifugal wind turbine according to claim 1, wherein the leading edge serration (6) extends from the tip of the blade (1) in the height direction of the blade (1) and the length of the leading edge serration (6) is 40% of the height of the blade (1).
3. The blade for a centrifugal fan with multiple blades according to claim 2, wherein the sawtooth structure (6) on the front edge comprises a plurality of groups of sawtooth noise reduction units, and the sawtooth noise reduction units are formed by sequentially arranging three sinusoidal waveform teeth with different sizes.
4. The blade for a multi-winged centrifugal fan according to claim 3, wherein the sizes of the three kinds of waveform teeth in the sawtooth noise reduction unit are respectively: first wave-shaped tooth height S 1 0.8-1.5 mm, tooth width A 1 2-2.6 mm; second wave-shaped tooth height S 2 3.5-5 mm, tooth width A 2 4-6.5 mm;third waveform tooth height S 3 2-3 mm, tooth width A 3 Is 3-4 mm.
5. The blade for the multi-wing centrifugal fan as claimed in claim 1, wherein the bionic grooves (7) are regularly arranged on the surface of the blade (1), and the bionic grooves (7) in two adjacent rows are arranged in a staggered manner.
6. The blade for the multi-wing centrifugal fan according to claim 5, wherein the bionic groove (7) is in a crescent shape formed by overlapping two arcs with different radiuses, wherein the radius R of a large arc is 3.5-6 mm, the radius R of a small arc is 2.8-4.5 mm, the length L of the bionic groove (7) is 5-8 mm, the depth of the groove is 2-3 mm, and the column pitch C of the array arrangement is 5-7 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222225982.7U CN218207193U (en) | 2022-08-23 | 2022-08-23 | Blade for multi-wing centrifugal fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222225982.7U CN218207193U (en) | 2022-08-23 | 2022-08-23 | Blade for multi-wing centrifugal fan |
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| Publication Number | Publication Date |
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| CN218207193U true CN218207193U (en) | 2023-01-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222225982.7U Active CN218207193U (en) | 2022-08-23 | 2022-08-23 | Blade for multi-wing centrifugal fan |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115949619A (en) * | 2023-03-13 | 2023-04-11 | 广东顺威精密塑料股份有限公司 | Design method of trailing edge sawtooth type fan blade with ridge-shaped surface structure and impeller |
-
2022
- 2022-08-23 CN CN202222225982.7U patent/CN218207193U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115949619A (en) * | 2023-03-13 | 2023-04-11 | 广东顺威精密塑料股份有限公司 | Design method of trailing edge sawtooth type fan blade with ridge-shaped surface structure and impeller |
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