CN115450937B - Low-noise, high-efficiency and small-vortex axial flow fan - Google Patents
Low-noise, high-efficiency and small-vortex axial flow fan Download PDFInfo
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- CN115450937B CN115450937B CN202211293421.9A CN202211293421A CN115450937B CN 115450937 B CN115450937 B CN 115450937B CN 202211293421 A CN202211293421 A CN 202211293421A CN 115450937 B CN115450937 B CN 115450937B
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- 230000001681 protective effect Effects 0.000 claims abstract description 20
- 244000126211 Hericium coralloides Species 0.000 claims description 14
- 125000004122 cyclic group Chemical group 0.000 claims description 5
- 230000007423 decrease Effects 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 4
- 238000009960 carding Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000006185 dispersion Substances 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
- 230000001629 suppression 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
-
- 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 an axial flow fan with low noise, high efficiency and small vortex, which comprises a motor, a rotary blade assembly and a protective net assembly, wherein the rotary blade assembly comprises a hub and blades, each blade comprises a blade body, a flow guiding folded edge, an outer edge and a front edge, the distance between the blade tip and an annular weft wire forming an air outlet net is larger than the minimum distance between the rear edge and the air outlet net, the rear edge extends from a rear connecting end part to the outer edge and gradually moves away from the air outlet net, the rear edge comprises a first part and a second part, and the interval between annular weft wires corresponding to the first part is smaller than the interval between annular weft wires corresponding to the second part; the plurality of comb teeth are distributed on the rear edge in sequence. According to different gear opening distances, the invention not only reduces the extra resistance of the fan, improves the efficiency of the fan, and reduces noise; and the large vortex can be effectively cut, the layered air flow is combed into countless small vortices, the viscous air flow of the blade can be effectively separated, the ideal air flow is formed, and the generation of strong turbulence is avoided.
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, high-efficiency and small-vortex 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 solve the technical problem of overcoming the defects of the prior art and providing an improved low-noise, high-efficiency and small-vortex axial flow fan.
In order to solve the technical problems, the invention adopts the following technical scheme: an axial flow fan with low noise, high efficiency and small vortex, 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 leading and trailing edges disposed on opposite sides of the outer edge, respectively;
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 body is arched from the middle of the back face 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 recessed mode, a comb tooth is formed between every two adjacent tooth grooves, the rear edge is bent from the two end portions to the outside of the blade body and is arc-shaped, a plurality of comb teeth are sequentially distributed on the rear edge, and the comb teeth are unevenly arranged on the orthographic projection surface of the thickness direction of the blade body;
the blade also comprises a diversion folded edge which is bent from the outer edge to the back surface of the blade body, and the diversion folded edge, the outer edge and the front edge form a blade tip; the blade body is from openly facing the protection network subassembly, and the blade body is crooked from wheel hub to apex gradually to the direction of flow, and the trailing edge at broach place is orientation the direction of flow is gone to the leading edge, and the distance of the air-out net that tip to cyclic annular weft formed is greater than trailing edge and the minimum distance between the air-out net, the trailing edge from back link tip to the outer fringe extend and gradually keep away from the air-out net, wherein the trailing edge is including pressing close to the first part of air-out net, and gradually keep away from the second part of air-out net, wherein the interval between cyclic annular weft that the first part corresponds is less than the interval between the cyclic annular weft that the second part corresponds.
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 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; and/or each comb tooth is correspondingly V-shaped, and the tip end 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.
Specifically, 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 sections passing through the tooth tips 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 sections is R, the chord length corresponding to the arc sections is x, wherein R/R epsilon [ 0.50-1.00 ], gamma/H epsilon [ 1.061297220-1.423966942 ], 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.
According to a specific implementation and preferred aspect of the invention, the distance from the blade tip to the air outlet network is L1, and the minimum distance Lmin between the trailing edge and the air outlet network 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.
Preferably, the leading edge is curved inwardly and arcuately from the leading end portion of the outer edge and the leading end portion of the aft connecting end portion, the end portion of the leading edge remote from the aft connecting end portion, the end portion of the outer edge remote from the trailing edge, and the end portion of the flow guiding flap remote from the trailing edge constitute 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, wherein the rounded transition between the outwardly folded surface and the front surface of the blade body and the angle formed between the inwardly folded surface and the rear surface of the blade body is an obtuse angle. Under such a large angle of guiding, particularly strong turbulence in the gap region is greatly reduced.
Preferably, the angle formed between the inner fold surface and the back surface of the blade body is set to gradually decrease from the leading edge to the trailing edge. The flow guiding effect is optimal and the noise is reduced.
Specifically, an 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.
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 is y, wherein, the y is more than or equal to R/200 and less than or equal to R/100.
Preferably, a plurality of rings of annular wefts are sequentially arranged at intervals and are arranged on the outer side of the collar, and each warp extends along the direction of the collar.
Further, the axial flow fan is further provided with an outer connecting seat, wherein the protective net component is positioned at one side of the outer connecting seat, the annular wefts are further provided with surrounding areas which are from the shaft collar to the outer connecting seat and gradually become larger in inner diameter, and the ends of the warps, which are far away from the shaft collar, are relatively fixedly connected with the annular wefts of the surrounding areas through connecting strips.
Preferably, the motor is located between the hub and the guard 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 different gear opening distances, the invention not only reduces the extra resistance of the fan, improves the efficiency of the fan, and reduces noise; and the large vortex can be effectively cut, the layered air flow is combed into countless small vortices, the viscous air flow of the blade can be effectively separated, the ideal air flow is formed, and the generation of strong turbulence is avoided.
Drawings
FIG. 1 is a schematic perspective view of a low noise, high efficiency, low vortex axial flow fan of 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 flow rate and efficiency of an axial flow fan with low noise, high efficiency and small vortex before and after implementation;
FIG. 9 is a graph showing the flow rate and noise of an axial flow fan with low noise, high efficiency and small vortex before and after implementation;
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, high-efficiency and small-vortex axial flow fan of the embodiment comprises a motor a, a rotary blade assembly B and a protective 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 rear face b, and the blade body 1 also has a rear connecting end portion 1a, an outer edge 1b away from the rear connecting end portion 1a, and a front edge 1C and a rear edge 1d correspondingly provided 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, high-efficiency and small-vortex axial flow fan is further provided with an outer connecting seat D, wherein the protective net component C is located at one side of the outer connecting seat D, the annular weft C2 is further provided with a surrounding area which is formed by connecting the outer connecting seat D from the collar C1 and gradually increases in inner diameter, and the end part of the warp C3, which is far away from the collar C1, is relatively and fixedly connected with a plurality of annular weft C2 of the surrounding area through a 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 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 1d constitute the blade tip Y. 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 moves 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 moves 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 (4)
1. A low noise, high efficiency, low vortex 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 leading and trailing edges disposed on opposite sides of the outer edge, respectively;
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 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 recessed mode, a comb tooth is formed between every two adjacent tooth grooves, and/or the area of each tooth groove is different in size, wherein each tooth groove is in a V shape, and the tip end of each tooth groove is arranged towards the rear 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; the rear edge is bent from the two end parts to the outside of the blade body and is arc-shaped, a plurality of comb teeth are sequentially distributed on the rear edge, and the comb teeth are unevenly arranged on the orthographic projection surface of the thickness direction of the blade body;
the blade also comprises a diversion folded edge which is bent from the outer edge to the back surface of the blade body, and the diversion folded edge, the outer edge and the front edge form a blade tip; the blade body is gradually bent from the front face to the protective net assembly, the rear edge where the comb teeth are located faces the protective net assembly, the front edge faces the incoming flow direction, the distance from the blade tip to the annular weft is larger than the minimum distance between the rear edge and the air outlet net, the rear edge extends from the rear connecting end portion 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 distance between the annular weft corresponding to the first part is smaller than the distance between the annular weft corresponding to the second part, and/or 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 larger than or equal to 2Lmin;
the outer edge is provided with a front end and a rear end, the front end and the rear end are arched and arranged from the front end to the rear connecting end, the rear connecting end is correspondingly provided 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, the front edge is far from the end of the rear connecting end, the outer edge is far from the end of the rear edge, and the end of the diversion hem far from the rear edge forms the blade tip; and/or, the width of the folded edge formed by the diversion folded edge gradually decreases from the front edge to the rear edge; and/or the flow guiding folded edge is provided with an outer folded surface and an inner folded surface, the outer folded surface and the front surface of the blade body are in round corner transition, wherein an angle formed between the inner folded surface and the back surface of the blade body is an obtuse angle, and the angle formed between the inner folded surface and the back surface of the blade body is gradually reduced from the front edge to the rear edge; and/or 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; and/or the width of the folded edge formed by the diversion folded edge is y, and the radius of the outer edge is R, wherein, the y is more than or equal to R/200 and less than or equal to R/100;
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 concentrically with the outer edge and drawn from the front edge to the rear 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 [ 1.061297220-1.423966942 ], and H/x epsilon [ 0.05-0.15 ].
2. The low noise, high efficiency, low vortex axial flow fan of claim 1, wherein: and a plurality of circles of annular wefts are sequentially arranged at intervals and are annularly arranged on the outer side of the shaft collar, and each warp extends along the direction of the shaft collar.
3. The low noise, high efficiency, low vortex axial flow fan of claim 1, wherein: 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, the annular wefts are further provided with surrounding areas which are from the shaft collar to the outer connecting seat and gradually become larger in inner diameter, and the ends of the warps, which are far away from the shaft collar, are fixedly connected with the annular wefts of the surrounding areas relatively through connecting strips.
4. The low noise, high efficiency, low vortex axial flow fan of claim 1, wherein: 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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| CN202110456621.0A CN113250983B (en) | 2021-04-26 | 2021-04-26 | Low-noise and high-efficiency axial flow fan |
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| CN113250983B (en) * | 2021-04-26 | 2022-11-04 | 江苏富丽华通用设备股份有限公司 | Low-noise and high-efficiency axial flow fan |
| CN113464489A (en) * | 2021-07-29 | 2021-10-01 | 江苏富丽华通用设备股份有限公司 | Axial flow fan blade and axial flow fan |
| CN117419071B (en) * | 2023-12-19 | 2024-06-28 | 珠海格力电器股份有限公司 | Fan blade assembly and axial flow fan with same |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN115450937A (en) | 2022-12-09 |
| CN115573931B (en) | 2024-01-05 |
| CN113250983B (en) | 2022-11-04 |
| CN113250983A (en) | 2021-08-13 |
| CN115573931A (en) | 2023-01-06 |
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