CN115573931B - Low-noise axial flow fan - Google Patents
Low-noise axial flow fan Download PDFInfo
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- CN115573931B CN115573931B CN202211292843.4A CN202211292843A CN115573931B CN 115573931 B CN115573931 B CN 115573931B CN 202211292843 A CN202211292843 A CN 202211292843A CN 115573931 B CN115573931 B CN 115573931B
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- 230000001681 protective effect Effects 0.000 claims abstract description 19
- 244000126211 Hericium coralloides Species 0.000 claims description 14
- 125000004122 cyclic group Chemical group 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 239000006185 dispersion Substances 0.000 abstract description 4
- 230000001629 suppression Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 4
- 238000009960 carding Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 241000883990 Flabellum Species 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/38—Blades
- F04D29/384—Blades characterised by form
- F04D29/386—Skewed blades
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/38—Blades
- F04D29/388—Blades characterised by construction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to a low-noise axial flow fan which comprises a motor, a rotating blade assembly, a protective net assembly and an outer connecting seat. According to the invention, on one hand, according to different gear opening distances, the additional resistance of the fan is reduced, the efficiency of the fan is improved, and the noise is reduced; the large vortex can be effectively cut into countless small vortices, viscous airflow of the blade can be effectively separated, ideal airflow is formed, and strong turbulence is avoided; on the other hand, the wind resistance is reduced, the air flow dispersion is improved, and the larger air output is provided while the turbulence suppression effect is met.
Description
The application is a divisional application of an axial flow fan with low noise and high efficiency, wherein the application date is 2021, 4, 26, and the application number is 202110456621.0.
Technical Field
The invention belongs to the field of fans, and particularly relates to a low-noise axial flow fan.
Background
The axial flow fan is widely applied to an air treatment device and various ventilation and heat dissipation environments due to large air quantity, low noise and low pressure, the design quality of the axial flow fan has great influence on the efficiency and noise of the fan, and the requirements on the efficiency of the fan for heat dissipation are higher along with the improvement of the national energy efficiency of an air conditioner, and the noise of a wind wheel is low and the efficiency is high.
However, in ventilators provided with wall rings, the main source of noise is located at the outer edge of the blades, in particular because of the small gap provided between the blade ends and the wall ring, in which region noise is generated due to high turbulence; meanwhile, the rear edge of the blade cannot effectively cut and comb large vortex generated at the air outlet into countless small vortices, and viscous airflow of the blade cannot be effectively separated, so that the guiding effect is not achieved, ideal airflow cannot be formed, and therefore the efficiency is low and the noise is high.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an improved low-noise axial flow fan.
In order to solve the technical problems, the invention adopts the following technical scheme:
a low noise axial flow fan, comprising:
a motor;
a rotary blade assembly comprising a hub, a plurality of blades evenly distributed about the circumference of the hub, wherein each of the blades comprises a blade body having a front face and a rear face, the blade body having a rear connection end for connection with the hub, an outer edge remote from the rear connection end, and front and rear edges disposed on opposite sides of the outer edge;
a protective screen assembly comprising a collar, a plurality of loops of annular weft, a plurality of warp threads for connecting in sequence said collar and a plurality of loops of said annular weft, in particular,
the blade further comprises a diversion folded edge which is bent from the outer edge to the back surface of the blade body, wherein the folded width formed by the diversion folded edge is gradually reduced from the front edge to the rear edge, the folded width formed by the diversion folded edge is y, the radius of the outer edge is R, wherein the ratio of R/200 is less than or equal to y to R/100, and the diversion folded edge, the outer edge and the front edge form a blade tip;
the blade body is gradually bent from the hub to the blade tip in the flowing direction, the rear edge of the comb teeth faces the protective net assembly, the front edge of the comb teeth faces the flowing direction, and the distance from the blade tip to the annular weft to form an air outlet net is larger than the minimum distance between the rear edge and the air outlet net; the rear edge extends from the rear connecting end part to the outer edge and gradually moves away from the air outlet net, the rear edge comprises a first part close to the air outlet net and a second part gradually moves away from the air outlet net, and the space between the annular wefts corresponding to the first part is smaller than the space between the annular wefts corresponding to the second part;
the axial flow fan is further provided with an outer connecting seat, wherein the protective net component is positioned on one side of the outer connecting seat, and the annular weft is further provided with an enclosing area with gradually enlarged inner diameter from the shaft collar to the outer connecting seat.
When the rotating part (i.e. the blades) is closer to the protective net, the distance between the protective net and the opening gear (i.e. the distance between the adjacent annular wefts) is required to be small, and when the rotating part (i.e. the blades) is farther from the protective net, the distance between the opening gear (i.e. the distance between the adjacent annular wefts) can be increased, so that the additional resistance of the fan is reduced according to different opening gear distances, the efficiency of the fan is improved, and the noise is reduced.
Preferably, the distance from the blade tip to the air outlet net is L1, and the minimum distance Lmin between the trailing edge and the air outlet net is L1 is more than or equal to 2Lmin. The blade tip part with large acting force is large in distance from the protective net, the air output is increased, and the noise is low.
According to a specific implementation and preferred aspect of the invention, the blade body is arched from the middle of the back surface to the outside of the blade body along the length direction of the blade body, a plurality of tooth grooves which are distributed at intervals are formed from the rear edge to the inside of the blade body in a concave manner, a comb tooth is formed between every two adjacent tooth grooves, and a plurality of comb teeth are sequentially distributed on the rear edge.
Preferably, the rear edge is curved outward of the blade body from both end portions and is curved, and the plurality of comb teeth are unevenly arranged on the orthographic projection plane of the blade body in the thickness direction. In this way, the layered air flow can be combed, the efficiency of the blade is further improved, and the noise is further reduced.
Preferably, the outer edge has a front end and a rear end, and is arranged in an arc-shaped arch from the front end and the rear end to be far away from the rear connecting end, the rear connecting end is correspondingly formed with a front end and a rear end, the front edge is inwards bent and arc-shaped from the front end of the outer edge and the front end of the rear connecting end, and the front edge is far away from the end of the rear connecting end, the end of the outer edge far away from the rear edge and the end of the guide folded edge far away from the rear edge form the blade tip. The blade tip is arranged, so that on one hand, noise is reduced, and efficiency is improved; on the other hand, the wind resistance is reduced, and meanwhile, part of air flow is decomposed, so that turbulence is avoided.
According to a further specific and preferred aspect of the invention, the guide flap has an outwardly folded surface and an inwardly folded surface, a rounded transition being made between the outwardly folded surface and the front surface of the blade body, wherein the angle formed between the inwardly folded surface and the rear surface of the blade body is an obtuse angle, and the angle formed between the inwardly folded surface and the rear surface of the blade body is arranged to taper from the front edge to the rear edge. Under the large-angle guide flow, particularly strong turbulence in a gap area is greatly reduced, the formed guide effect is optimal, and noise is reduced.
Preferably, the angle formed between the inner folded surface and the back surface of the blade body is less than or equal to 120 degrees and less than or equal to 160 degrees. The wind resistance is reduced, the airflow dispersion is improved, and then, the larger air volume output is provided while the turbulence suppression effect is satisfied.
According to yet another specific and preferred aspect of the present invention, each of said tooth slots is of unequal size in area, wherein each of said tooth slots is "V" -shaped with its tip portion disposed inwardly of said trailing edge; and/or each comb tooth is correspondingly V-shaped, and the tip end part of each comb tooth faces to the outside of the blade body. In this way, on one hand, the large vortex generated at the air outlet is cut and carded into countless small vortices, and on the other hand, the viscous airflow of the blade is effectively separated, so that not only can the noise be reduced, but also the efficiency of the blade can be improved, and the cost is reduced.
Preferably, the radius of the outer edge is R, the tooth distance between every two adjacent comb teeth is gamma, the tooth height of each comb tooth is H, a plurality of arc-shaped sections passing through the tooth tip of each comb tooth are formed concentrically with the outer edge and arc-drawn from the front edge to the rear edge, the radius corresponding to the arc-shaped sections is R, the chord length corresponding to the arc-shaped sections is x, wherein R/R epsilon [ 0.50-1.00 ], gamma/H epsilon [ 1.00-1.60 ], and H/x epsilon [ 0.05-0.15 ]. Based on the ratio information, the shape of the teeth and the position of the tips can be determined.
In addition, the end part of the warp far away from the collar is used for relatively and fixedly connecting a plurality of annular wefts in the surrounding area through a connecting strip; the motor is located between the hub and the protective net assembly, and an output shaft of the motor passes through the hub.
Due to the implementation of the technical scheme, compared with the prior art, the invention has the following advantages:
according to the invention, on one hand, according to different gear opening distances, the additional resistance of the fan is reduced, the efficiency of the fan is improved, and the noise is reduced; the large vortex can be effectively cut into countless small vortices, viscous airflow of the blade can be effectively separated, ideal airflow is formed, and strong turbulence is avoided; on the other hand, the wind resistance is reduced, the air flow dispersion is improved, and the larger air output is provided while the turbulence suppression effect is met.
Drawings
FIG. 1 is a schematic perspective view of a low noise axial flow fan according to the present invention;
FIG. 2 is a schematic front view of FIG. 1;
FIG. 3 is a schematic cross-sectional view of A-A of FIG. 2;
FIG. 4 is a partially omitted schematic illustration of the structure of FIG. 1;
FIG. 5 is a schematic view of the front structure of the blade of FIG. 1;
FIG. 6 is a schematic view of the rear face structure of the bucket of FIG. 1;
FIG. 7 is a schematic illustration of the comb distribution of the blade of FIG. 1;
FIG. 8 is a graph showing the comparison of air volume and efficiency before and after implementation of a low noise axial flow fan;
FIG. 9 is a graph showing the comparison of air volume and noise before and after implementation of a low noise axial flow fan;
wherein: A. a motor;
B. a rotating blade assembly; b1, a hub; b2, blades; 1. a blade body; a. a front face; b. a back surface; 1a, rear connecting end; 1b, outer edge; 1c, leading edge; 1d, trailing edge; 1e, comb teeth; 1f, tooth grooves; 2. diversion flanging;
C. a protective net assembly; c1, a collar; c2, annular wefts; c3, warp threads; c4, connecting strips;
D. an outer connecting seat;
y, blade tip.
Detailed Description
In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.
As shown in fig. 1, the low noise axial flow fan of the present embodiment includes a motor a, a rotary blade assembly B, and a protection net assembly C.
Specifically, the rotary blade assembly B includes a hub B1, a plurality of blades B2 uniformly distributed around the circumference of the hub B1.
In this example, the blades B2 have five blades and are uniformly distributed around the circumference of the hub B1, and the motor a is located between the hub B1 and the protection net assembly C, wherein an output shaft of the motor a passes through the hub B1.
Specifically, the blade B2 comprises a blade body 1 and a guide folded edge 2, wherein the blade body 1 and the guide folded edge 2 are integrally formed.
The blade body 1 has a front face a and a back face b, and the blade body 1 also has a rear connecting end portion 1a, an outer edge 1b far away from the rear connecting end portion 1a, and a front edge 1C and a rear edge 1d correspondingly disposed on opposite sides of the outer edge 1b, and when mounted, the blade body 1 faces the protection net assembly C from the front face a.
Meanwhile, in this example, a plurality of comb teeth 1e capable of effectively cutting and carding a large vortex into countless small vortices are formed on the trailing edge 1d, wherein the plurality of comb teeth 1e are sequentially distributed on the arc-shaped edge from front to back.
As shown in fig. 2 and 3, the protection net assembly C includes a collar C1, a plurality of ring-shaped wefts C2 coaxially extending and sequentially spaced apart around the collar C1, and a plurality of warps C3 extending along the direction of the collar C1 and sequentially connecting the collar C1 and the plurality of ring-shaped wefts C2.
Specifically, the protection net assembly C can be seen in ZL202021538744.6, and will not be repeated here.
In this example, the low noise axial fan still has outer connecting seat D, and wherein protection network subassembly C is located outer connecting seat D's one side, and cyclic annular weft C2 still has and is the area of enclosing that the internal diameter becomes gradually big from the outside connecting seat D of axle ring C1, and the end that warp C3 kept away from axle ring C1 will enclose a plurality of cyclic annular weft C2 relative fixed connection of area through connecting strip C4.
Referring to fig. 4, the front surface faces the protection net component 2, and the blade body 1 is gradually bent from the hub B1 to the blade tip Y in the flowing direction, the rear edge 1d where the comb teeth 1e are located faces the protection net component C, and the front edge 1C faces the flowing direction, wherein the distance from the rear part of the rear edge 1d to the protection net component C is smaller than the distance from the blade tip Y where the front part of the rear edge 1d is located to the protection net component C, and the distance between annular wefts C2 corresponding to the rear part of the rear edge 1d is smaller than the distance between annular wefts C2 corresponding to the blade tip Y.
For better understanding of the structure of the blade B2, as shown in fig. 5 and 6, the blade body 1 is arched from the back side B along the length direction thereof, the rear edge 1d is bent outward from the front and rear end portions toward the blade body 1 and is arched, the front edge 1c is bent inward from the front and rear end portions toward the blade body 1 and is arched, and the outer edge 1B is arched from the opposite sides toward the front. In this way, the shaping of the blade is determined.
Specifically, the outer edge 1b has a front end and a rear end, and the rear connecting end 1a is correspondingly formed with the front end and the rear end, wherein the line between the rear end of the outer edge 1b and the rear end of the rear connecting end 1a is a chord length corresponding to an arc, and the chord length is set according to the size of the outer edge radius, so that the arc angle and the arc length are more favorable to be determined.
Meanwhile, in this example, a plurality of comb teeth 1e capable of effectively cutting and carding a large vortex into countless small vortices are formed on the trailing edge 1d, wherein the plurality of comb teeth 1e are sequentially distributed on the arc-shaped edge from front to back.
Specifically, a plurality of tooth grooves 1f are formed from the trailing edge 1d to the inside of the blade body 1 in a recessed manner, a comb tooth 1e is formed between every two adjacent tooth grooves 1f, and the area of each tooth groove 1f is different in size. In this way, on one hand, the large vortex generated at the air outlet is cut and carded into countless small vortices, and on the other hand, the viscous airflow of the blade is effectively separated, so that not only can the noise be reduced, but also the efficiency of the blade can be improved, and the cost is reduced.
In this example, each tooth slot 1f is V-shaped, and the tip end of the tooth slot is arranged towards the inside of the trailing edge 1 d; each comb tooth 1e is correspondingly V-shaped, and the tip end part of each comb tooth faces the outside of the blade body 1. Thus facilitating the processing and forming of comb teeth
In this example, the blade body 1 is arranged to arch outward of the blade body 1 from the middle of the rear surface b along the longitudinal direction thereof, and the plurality of comb teeth 1e are arranged unevenly on the orthographic projection surface of the blade body 1 in the thickness direction. In this way, the layered air flow can be combed, the efficiency of the blade is further improved, and the noise is further reduced.
The front edge 1c is curved inward and curved from the front end of the outer edge 1b and the front end of the rear connecting end 1a, wherein the tip Y is formed by the end of the front edge 1c remote from the rear connecting end 1a, the end of the outer edge 1b remote from the rear edge 1d, and the end of the guide flange 2 remote from the rear edge 1 d. The blade tip is arranged, so that on one hand, noise is reduced, and efficiency is improved; on the other hand, the wind resistance is reduced, and meanwhile, part of air flow is decomposed, so that turbulence is avoided.
Specifically, the guide flange 2 has an outer flange surface 2a and an inner flange surface 2b, wherein a rounded transition is formed between the outer flange surface 2a and the front surface a of the vane body 1, and an angle formed between the inner flange surface 2b and the back surface b of the vane body 1 is an obtuse angle. Under such a large angle of guiding, particularly strong turbulence in the gap region is greatly reduced.
The angle formed between the inner fold surface 2b and the back surface b of the blade body 1 gradually decreases from the front edge 1c to the rear edge 1 d. The flow guiding effect is optimal and the noise is reduced.
In this example, the tip Y forms an angle 1=156° between the folded-in surface 2b and the back surface b of the blade body 1, and the tip end far from the tip Y forms an angle 2=132° between the folded-in surface 2b and the back surface b of the blade body 1. Not only can reduce the windage, but also disperse the air current, noise reduction.
Specifically, the distance between the blade tip Y and the annular weft c2 to form the air outlet net is greater than the minimum distance between the trailing edge 1d and the air outlet net.
The distance from the blade tip Y to the air outlet net is L1, and the minimum distance Lmin between the trailing edge and the air outlet net is not less than 2Lmin. The blade tip part with large acting force is large in distance from the protective net, the air output is increased, and the noise is low. Further, the rear edge extends from the rear connecting end part to the outer edge and gradually gets away from the air outlet net, wherein the rear edge comprises a first part close to the air outlet net and a second part gradually gets away from the air outlet net, and the distance between annular wefts corresponding to the first part is smaller than the distance between annular wefts corresponding to the second part. Thus, when the rotating component (i.e. the blades) is closer to the protective net, the distance between the protective net and the opening gear (i.e. the distance between the adjacent annular wefts) is required to be small, and when the rotating component (i.e. the blades) is farther from the protective net, the distance between the opening gear (i.e. the distance between the adjacent annular wefts) can be increased, so that the additional resistance of the fan is reduced according to different opening gear distances, the efficiency of the fan is improved, and the noise is reduced.
In addition, the width of the folded edge formed by the diversion folded edge is gradually reduced from the front edge to the rear edge. The wind resistance is reduced, the airflow dispersion is improved, and then, the larger air volume output is provided while the turbulence suppression effect is satisfied.
Specifically, the width of the folded edge formed by the diversion folded edge 2 is Y, wherein the width of the diversion folded edge 2 at the position of the blade tip Y is R/100, and the width of the diversion folded edge 2 at the position far away from the blade tip Y is R/200.
As shown in fig. 7, there are 8 tooth grooves 1f in this example, and each two adjacent tooth grooves 1f form a comb tooth 1e, and the radius of the outer edge is R, and r=475 is shown in the following table.
In summary, the present embodiment has the following advantages:
1) The blade body and the integrally formed guide folded edges formed by the special arc and each arc edge can prevent strong turbulence from being generated at the gap between the end part of the blade and the wall ring, so that noise is reduced; on the other hand, the large vortex can be effectively cut and carded into countless small vortices, and the viscous airflow of the blade can be effectively separated to form ideal airflow, so that the efficiency is high and the noise is low;
2) The plurality of comb teeth are arranged unevenly in the thickness direction of the blade body, so that layered air flow can be combed, the efficiency of the blade is improved, and the noise is further reduced;
3) Through the angle and the width setting of water conservancy diversion hem, not only can reduce the windage, promote the work efficiency of flabellum moreover, noise abatement simultaneously.
4) The distance between the annular wefts changes along with the change of the blade and the protective net component, particularly when the blade tip is far away from the protective net, the extra resistance of the fan is reduced (or the air quantity is understood to be increased) when the gear opening gap is large through the increase of the distance between the annular wefts (or the increase of the gear opening distance), and meanwhile, the noise is also reduced.
In addition, with reference to fig. 8 and 9, it can be intuitively seen that after the blade is used, the working efficiency is obviously improved and the noise is obviously reduced under the same air quantity.
Meanwhile, in the embodiment, the angle formed by the guide folded edge and the back surface of the blade body is changed gradually, and the formed width of the guide folded edge is combined with the gradual change, so that the blade forms an integral scheme, and the advantages of low noise, high efficiency and the like can be optimally realized due to the technical effect.
The present invention has been described in detail with the purpose of enabling those skilled in the art to understand the contents of the present invention and to implement the same, but not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (3)
1. A low noise axial flow fan, comprising:
a motor;
a rotary blade assembly comprising a hub, a plurality of blades evenly distributed about the circumference of the hub, wherein each of the blades comprises a blade body having a front face and a rear face, the blade body having a rear connection end for connection with the hub, an outer edge remote from the rear connection end, and front and rear edges disposed on opposite sides of the outer edge;
the protection network subassembly, it includes collar, many rings of cyclic annular wefts, many are used for connecting gradually the collar with many rings of the warp of cyclic annular weft, its characterized in that:
the blade further comprises a diversion folded edge which is bent from the outer edge to the back surface of the blade body, wherein the folded width formed by the diversion folded edge is gradually reduced from the front edge to the rear edge, the folded width formed by the diversion folded edge is y, the radius of the outer edge is R, wherein the ratio of R/200 is less than or equal to y to R/100, and the diversion folded edge, the outer edge and the front edge form a blade tip; the radius of the outer edge is R, the tooth distance between every two adjacent comb teeth is gamma, the tooth height of each comb tooth is H, a plurality of arc segments passing through the tooth tips of each comb tooth are formed from the front edge to the rear edge concentrically with the outer edge, the radius corresponding to the arc segments is R, the chord length corresponding to the arc segments is x, wherein R/R epsilon [ 0.50-1.00 ], gamma/H epsilon [ 1.00-1.60 ], and H/x epsilon [ 0.05-0.15 ]; the guide folded edge is provided with an outward folded surface and an inward folded surface, the outward folded surface and the front surface of the blade body are in round corner transition, wherein an angle formed between the inward folded surface and the back surface of the blade body is less than or equal to 120 degrees and less than or equal to 160 degrees; the angle formed between the inward folded surface and the back surface of the blade body gradually decreases from the front edge to the rear edge; the blade body is gradually bent from the hub to the blade tip in the flowing direction, the rear edge of the comb teeth faces the protective net assembly, the front edge of the comb teeth faces the flowing direction, and the distance from the blade tip to the annular weft to form an air outlet net is larger than the minimum distance between the rear edge and the air outlet net; the rear edge extends from the rear connecting end part to the outer edge and gradually gets away from the air outlet net, the rear edge comprises a first part close to the air outlet net and a second part gradually gets away from the air outlet net, the space between the annular wefts corresponding to the first part is smaller than the space between the annular wefts corresponding to the second part, the distance from the blade tip to the air outlet net is L1, and the minimum distance Lmin between the rear edge and the air outlet net is not less than 2Lmin; the blade body is arched from the middle of the back surface to the outside of the blade body along the length direction of the blade body, a plurality of tooth grooves which are distributed at intervals are formed from the rear edge to the inside of the blade body in a sunken mode, a comb tooth is formed between every two adjacent tooth grooves, and a plurality of comb teeth are sequentially distributed on the rear edge; the rear edges are bent from the two end parts to the outside of the blade body and are arc-shaped, and a plurality of comb teeth are unevenly arranged on the orthographic projection surface of the blade body in the thickness direction; the area of each tooth slot is different in size, wherein each tooth slot is in a V shape, and the tip end of each tooth slot is arranged towards the inside of the rear edge; each comb tooth is correspondingly V-shaped, and the tip end of each comb tooth faces to the outside of the blade body; the axial flow fan is further provided with an outer connecting seat, wherein the protective net component is positioned on one side of the outer connecting seat, and the annular weft is further provided with an enclosing area with gradually enlarged inner diameter from the shaft collar to the outer connecting seat.
2. The low noise axial flow fan according to claim 1, wherein: the outer fringe has front and back tip, and from front and back tip to keeping away from back connection tip arc arch setting, back connection tip corresponds and is formed front and back tip, the leading edge is followed the front end of outer fringe with the front end of back connection tip is inwards crooked and is the arc, the leading edge is kept away from back connection tip's tip, the outer fringe is kept away from the tip of trailing edge and the water conservancy diversion hem is kept away from the tip of trailing edge.
3. The low noise axial flow fan according to claim 1, wherein: the end part of the warp, which is far away from the collar, is used for relatively and fixedly connecting a plurality of annular wefts in the surrounding area through a connecting strip; the motor is located between the hub and the protective net assembly, and an output shaft of the motor passes through the hub.
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| CN202211292843.4A CN115573931B (en) | 2021-04-26 | 2021-04-26 | Low-noise axial flow fan |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110456621.0A CN113250983B (en) | 2021-04-26 | 2021-04-26 | Low-noise and high-efficiency axial flow fan |
| CN202211292843.4A CN115573931B (en) | 2021-04-26 | 2021-04-26 | Low-noise axial flow fan |
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| CN202110456621.0A Active CN113250983B (en) | 2021-04-26 | 2021-04-26 | Low-noise and high-efficiency axial flow fan |
| CN202211293421.9A Active CN115450937B (en) | 2021-04-26 | 2021-04-26 | Low-noise, high-efficiency and small-vortex axial flow fan |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN115450937B (en) | 2023-12-29 |
| CN115450937A (en) | 2022-12-09 |
| CN113250983B (en) | 2022-11-04 |
| CN113250983A (en) | 2021-08-13 |
| CN115573931A (en) | 2023-01-06 |
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