CN214945135U - Low-noise and high-efficiency axial flow fan - Google Patents
Low-noise and high-efficiency axial flow fan Download PDFInfo
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- CN214945135U CN214945135U CN202120877325.3U CN202120877325U CN214945135U CN 214945135 U CN214945135 U CN 214945135U CN 202120877325 U CN202120877325 U CN 202120877325U CN 214945135 U CN214945135 U CN 214945135U
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Abstract
The utility model relates to a low noise, high-efficient axial fan, including motor, rotating vane subassembly, protection net subassembly, the blade body is from wheel hub to apex to the direction of flow bending gradually, and the trailing edge at broach place is towards the protection network subassembly, and the leading edge is towards the direction of flow, and the apex is greater than trailing edge and play minimum distance between the air net to the distance that cyclic annular weft formed out the air net. The utility model discloses an aspect is through the gradual bending of blade body in order to change the safe distance between apex and the protection network, and the broach on the trailing edge is unequal with the distance of protection network subassembly simultaneously, reduces the extra resistance of fan, improves the efficiency of fan, reduces the noise; on the other hand, under the action of the comb teeth and the guide folding edges, strong turbulence is avoided, large eddy can be effectively cut and combed into countless small eddy, and simultaneously, viscous airflow of the blades can be effectively separated to form ideal airflow.
Description
Technical Field
The utility model belongs to the fan field, concretely relates to low noise, high-efficient axial fan.
Background
The low-noise and high-efficiency axial flow fan is widely applied to air treatment devices and various ventilation and heat dissipation environments due to large air quantity, low noise and low pressure, the design of the low-noise and high-efficiency axial flow fan greatly affects the efficiency and the noise of the fan, along with the improvement of the energy efficiency of an air conditioner by the country, the requirement on the efficiency of the fan for heat dissipation is higher, the noise of a wind wheel is required to be low, and the efficiency is high.
However, in ventilators provided with a wall ring, the main source of noise is located at the outer edge of the blade, in particular because of the small gap provided between the blade end and the wall ring, in which region noise is generated due to high turbulence; meanwhile, the rear edge of the blade can not effectively cut and comb the large vortex generated at the air outlet into countless small vortices, and can not effectively separate the viscous airflow of the blade, so that the guiding effect can not be achieved, and ideal airflow can not be formed, so that the efficiency is low and the noise is high.
Disclosure of Invention
The utility model aims to solve the technical problem that overcome prior art not enough, provide an improved low noise, high-efficient axial fan.
In order to solve the technical problem, the utility model discloses the technical scheme who takes as follows:
a low noise, high efficiency axial flow fan comprising:
a motor;
a rotating blade assembly comprising a hub, a plurality of blades uniformly distributed around the circumference of the hub, wherein each of the blades comprises a blade body having a front surface and a back surface, the blade body having a connection end for connection with the hub, an outer edge remote from the connection end, and a leading edge and a trailing edge disposed on opposite sides of the outer edge;
the protective net component comprises a shaft collar, a plurality of circles of annular wefts which coaxially extend and are sequentially arranged at intervals and annularly arranged on the outer side of the shaft collar, and a plurality of warps which respectively extend along the direction of the shaft collar and are used for sequentially connecting the shaft collar and the plurality of circles of annular wefts,
particularly, comb teeth are formed on the rear edge, the blade further comprises a flow guide folding edge which is bent from the outer edge to the back of the blade body, and the flow guide folding edge, the outer edge and the front edge form blade tips; the blade body is from openly towards the protection network subassembly, and the blade body is from wheel hub to apex bending to the direction of current gradually, and the trailing edge at broach place is towards the protection network subassembly, and the leading edge is towards the direction of current, and the apex is greater than the minimum distance between trailing edge and the air-out net to the distance of the annular weft formation air-out net.
Preferably, the distance from the blade tip to the air outlet net is L1, and the minimum distance between the rear edge and the air outlet net is Lmin, wherein L1 is more than or equal to 2 Lmin. The distance between the tip part with large work and the protective net is large, the air output is increased, and the noise is low.
Furthermore, the rear edge extends from the connecting end part to the outer edge and is gradually far 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 far away from the air outlet net, and the distance between the annular weft yarns corresponding to the first part is smaller than the distance between the annular weft yarns corresponding to the second part. Thus, when rotating part (that is the blade) is nearer apart from the protection network, the protection network is opened shelves apart from (that is to say the interval between the adjacent annular weft) and is required for a short time, and when rotating part (that is to say the blade) is far away from the protection network, can increase and open shelves apart from (that is to say the interval between the adjacent annular weft), consequently, according to the distance of opening shelves of difference, reduces the extra resistance of fan, improves the efficiency of fan, reduces the noise.
Preferably, a plurality of tooth grooves distributed at intervals are formed by sinking from the rear edge into the blade body, a comb tooth is formed between every two adjacent tooth grooves, and the comb tooth on the rear edge can effectively cut and comb large eddy currents into countless small eddy currents.
Preferably, the rear edge is curved outward from both end portions toward the blade body and is arc-shaped, and the plurality of comb teeth are sequentially distributed on the rear edge.
According to a specific implementation and preferred aspect of the present invention, the outer edge has a front end portion and a rear end portion, and the connection end portion is correspondingly formed with a front end portion and a rear end portion, wherein a connection line between the rear end portion of the outer edge and the rear end portion of the connection end portion is a chord length corresponding to the arc, and the chord length is greater than or equal to the radius of the outer edge. Therefore, the distribution of the comb teeth can meet the effect of cutting and carding large eddy.
Specifically, the ratio of the chord length to the outer edge radius is z, wherein z is more than or equal to 1 and less than or equal to 1.2. In this way, the chord length is set according to the size of the outer edge radius, and thus, it is more advantageous to determine the arc angle and the arc length.
Furthermore, the area of each tooth socket is different in size. Therefore, on one hand, the large vortex generated at the air outlet is cut and combed into countless small vortices, and on the other hand, the viscous airflow of the blade is effectively separated, so that the noise can be reduced, the efficiency of the blade can be improved, and the cost is reduced.
According to a further embodiment and preferred aspect of the present invention, each gullet is "V" shaped with a tip disposed towards the trailing edge; each comb tooth is correspondingly V-shaped, and the tip end of each comb tooth faces the outside of the blade body. Thus, the comb teeth can be conveniently machined and formed.
Specifically, the radius of the outer edge is R, the tooth pitch between every two adjacent comb teeth is gamma, the tooth height of each comb tooth is H, the outer edge is concentric with the outer edge and forms a plurality of arc-shaped sections passing through the tooth tips of each comb tooth by drawing an arc from the front edge to the rear edge, the radius corresponding to each arc-shaped section is R, and the chord length corresponding to each arc-shaped section is x, wherein R/R belongs to [ 0.50-1.00 ], R/H belongs to [ 1.00-1.60 ], and H/x belongs to [ 0.05-0.15 ]. From the above ratio information, the shape of the comb teeth, and the position of the tooth tip can be determined.
Preferably, the blade body is arched outwards from the middle of the back along the length direction of the blade body, and the plurality of comb teeth are arranged on the orthographic projection surface of the blade body in the thickness direction in a staggered mode. Thus, the layered air flow can be combed, the efficiency of the blade is further improved, and the noise is further reduced.
Furthermore, the front edge is bent inwards from the front end part of the outer edge and the front end part of the connecting end part and is in an arc shape, and the end part of the front edge far away from the connecting end part, the end part of the outer edge far away from the rear edge and the end part of the guide folding edge far away from the rear edge form a blade tip. In this case, through the arrangement of the blade tips, on one hand, the noise is reduced, and the efficiency is improved; on the other hand, the wind resistance is reduced, and meanwhile, partial airflow is decomposed, so that the generation of turbulence is avoided.
According to the utility model discloses a still another concrete implementation and preferred aspect, the water conservancy diversion hem has outer folding surface and infolding face, and wherein fillet transition between outer folding surface and the front of blade body, and the angle that forms between the back of infolding face and blade body is the obtuse angle. At such a large angle of flow guidance, the particularly strong turbulence occurring in the gap region is greatly reduced.
Preferably, an angle formed between the folded-in surface and the back surface of the blade body is set gradually smaller from the front edge toward the rear edge. The formed flow guide effect is optimal, and the noise is reduced.
Specifically, the angle formed between the inward-folding surface and the back surface of the blade body is less than or equal to angle A, wherein the angle A 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 guide folded edge is gradually reduced from the front edge to the rear edge. The wind resistance is reduced, the air flow dispersion is improved, and then, a larger air volume output is provided while satisfying the turbulence suppression effect.
Specifically, the width of a folded edge formed by the diversion folded edge is y, wherein R/200 is more than or equal to y and is less than or equal to R/100.
Due to the implementation of the above technical scheme, compared with the prior art, the utility model have the following advantage:
the utility model discloses an aspect is through the gradual bending of blade body in order to change the safe distance between apex and the protection network, and the broach on the trailing edge is unequal with the distance of protection network subassembly simultaneously, reduces the extra resistance of fan, improves the efficiency of fan, reduces the noise; on the other hand, under the action of the comb teeth and the guide folding edges, strong turbulence is avoided, large eddy can be effectively cut and combed into countless small eddy, and simultaneously, viscous airflow of the blades can be effectively separated to form ideal airflow.
Drawings
Fig. 1 is a schematic perspective view of a low-noise and high-performance axial flow fan according to the present invention;
FIG. 2 is a schematic front view of FIG. 1;
FIG. 3 is a schematic sectional view taken along line A-A in FIG. 2;
FIG. 4 is a partial schematic illustration of the structure of FIG. 1;
FIG. 5 is a schematic front view of the blade of FIG. 1;
FIG. 6 is a schematic view of a back side configuration of the blade machine of FIG. 1;
FIG. 7 is a schematic view of the comb tooth distribution of the blade of FIG. 1;
FIG. 8 is a graph illustrating a comparison of air flow and efficiency before and after implementation of a low noise, high efficiency axial flow fan;
FIG. 9 is a graph showing a comparison of air flow and noise before and after implementation of a low-noise, high-performance axial flow fan;
wherein: A. a motor;
B. a rotating blade assembly; b1, a hub; b2, a blade; 1. a blade body; a. a front side; b. a back side; 1a, a rear connection end; 1b, outer edge; 1c, leading edge; 1d, trailing edge; 1e, comb teeth; 1f, tooth grooves; 2. flow guiding and edge folding;
C. a protective screen assembly; c1, collar; c2, a circular weft; c3, warp yarn; c4, connecting strips;
D. an outer connecting base;
y, leaf tip.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.
As shown in fig. 1, the low-noise high-performance axial flow fan of the present embodiment includes a motor a, a rotating blade assembly B, and a protective net assembly C.
Specifically, the rotating blade assembly B includes a hub B1, a plurality of blades B2 evenly distributed around the circumference of the hub B1.
In this example, the blades B2 have five blades and are evenly distributed circumferentially around the hub B1, and the motor a is located between the hub B1 and the protective net assembly C, wherein the output shaft of the motor a passes through the hub B1.
Specifically, the blade B2 includes a blade body 1 and a guide folding edge 2, wherein the blade body 1 and the guide folding edge 2 are integrally formed.
The blade body 1 is provided with a front face a and a back face b, the blade body 1 is also provided with a rear connecting end part 1a, an outer edge 1b far away from the rear connecting end part 1a, and a front edge 1C and a rear edge 1d correspondingly arranged on two opposite sides of the outer edge 1b, and when the blade body 1 is installed, the front face a faces the protection net component C.
Meanwhile, in this example, a plurality of comb teeth 1e capable of cutting and combing a large vortex into innumerable small vortices efficiently are formed on the trailing edge 1d, wherein the plurality of comb teeth 1e are distributed on the arc-shaped edge in order from front to rear.
As shown in fig. 2 and 3, the protective netting assembly C includes a collar C1, a plurality of circles of coaxially extending annular weft threads C2 arranged at intervals in sequence and annularly arranged outside the collar C1, and a plurality of warp threads C3 extending in the direction of the collar C1 and connecting the collar C1 and the plurality of circles of annular weft threads C2 in sequence.
Specifically, the protective net component C can be referred to as ZL202021538744.6, and is not repeated here.
In this example, the low-noise and high-performance axial flow fan further comprises an outer connecting base D, wherein the protective net component C is located on one side of the outer connecting base D, the annular weft C2 further comprises an enclosing area which is gradually enlarged from the collar C1 to the outer connecting base D, and the end of the warp C3 far away from the collar C1 is used for relatively fixedly connecting a plurality of annular wefts C2 of the enclosing area through the connecting strip C4.
As shown in fig. 4, the front face faces the protection net assembly 2, the blade body 1 gradually curves in the inflow direction from the hub B1 to the blade tip Y, the rear edge 1d where the comb teeth 1e are located faces the protection net assembly C, and the front edge 1C faces the inflow direction, wherein the distance from the rear part of the rear edge 1d to the protection net assembly C is smaller than the distance from the blade tip Y located at the front part of the rear edge 1d to the protection net assembly C, and the distance between the annular wefts C2 corresponding to the rear part of the rear edge 1d is smaller than the distance between the annular wefts C2 corresponding to the blade tip Y.
To more clearly understand the structure of the blade B2, as shown in fig. 5 and 6, the blade body 1 is curved from the back surface B along its longitudinal direction, the rear edge 1d is curved outward from the front and rear ends toward the blade body 1, the front edge 1c is curved inward from the front and rear ends toward the blade body 1, and the outer edge 1B is curved forward from the opposite sides. In this way, the shape of the blade is determined.
Specifically, the outer edge 1b has front and rear end portions, and the connecting end portion 1a is correspondingly formed with the front and rear end portions, wherein a connecting line between the rear end portion of the outer edge 1b and the rear end portion of the connecting end portion 1a is a chord length corresponding to an arc, and the chord length is greater than or equal to the radius of the outer edge 1 b.
In this example, the ratio z of the chord length to the outer edge radius is 1.1. In this way, the chord length is set according to the size of the outer edge radius, and thus, it is more advantageous to determine the arc angle and the arc length.
Meanwhile, in this example, a plurality of comb teeth 1e capable of cutting and combing a large vortex into innumerable small vortices efficiently are formed on the trailing edge 1d, wherein the plurality of comb teeth 1e are distributed on the arc-shaped edge in order from front to rear.
Specifically, a plurality of tooth sockets 1f distributed at intervals are formed by recessing the rear edge 1d into the blade body 1, a comb tooth 1e is formed between every two adjacent tooth sockets 1f, and the area of each tooth socket 1f is different in size. Therefore, on one hand, the large vortex generated at the air outlet is cut and combed into countless small vortices, and on the other hand, the viscous airflow of the blade is effectively separated, so that the noise can be reduced, the efficiency of the blade can be improved, and the cost is reduced.
In this example, each tooth slot 1f is in a "V" shape, and the tip thereof is disposed toward the trailing edge 1 d; each comb tooth 1e is correspondingly V-shaped, and the tip end of the comb tooth is arranged towards the outside of the blade body 1. Thus, the comb teeth can be conveniently processed and formed
In this example, the blade body 1 is curved outward from the middle of the back surface b in the longitudinal direction of the blade body 1, and the plurality of comb teeth 1e are arranged at intervals on the front projection surface of the blade body 1 in the thickness direction. Thus, 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 bent inward from the front end of the outer edge 1b and the front end of the connecting end 1a and is arc-shaped, wherein the end of the front edge 1c far away from the connecting end, the end of the outer edge 1b far away from the rear edge 1d, and the end of the guide folding edge 2 far away from the rear edge 1d form a blade tip Y. In this case, through the arrangement of the blade tips, on one hand, the noise is reduced, and the efficiency is improved; on the other hand, the wind resistance is reduced, and meanwhile, partial airflow is decomposed, so that the generation of turbulence is avoided.
Specifically, the guide folding edge 2 has an outer folding surface 2a and an inner folding surface 2b, wherein the outer folding surface 2a is in round angle transition with the front surface a of the blade body 1, and an angle formed between the inner folding surface 2b and the back surface b of the blade body 1 is an obtuse angle. At such a large angle of flow guidance, the particularly strong turbulence occurring in the gap region is greatly reduced.
The angle formed between the folded-in surface 2b and the back surface b of the blade body 1 is gradually reduced from the front edge 1c to the rear edge 1 d. The formed flow guide effect is optimal, and the noise is reduced.
In this example, a angle 1 between the folded-in surface 2b of the tip Y and the back surface b of the blade body 1 is 156 °, and a angle 2 between the folded-in surface 2b away from the tip Y end and the back surface b of the blade body 1 is 132 °. Not only can reduce the windage, but also disperse the air current, reduce the noise.
Specifically, the distance from the blade tip Y to the air outlet net formed by the annular weft c2 is greater than the minimum distance between the rear 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 between the rear edge and the air outlet net is Lmin, wherein L1 is more than or equal to 2 Lmin. The distance between the tip part with large work and the protective net is large, the air output is increased, and the noise is low. Furthermore, the rear edge extends from the connecting end part to the outer edge and is gradually far 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 far away from the air outlet net, and the distance between the annular weft yarns corresponding to the first part is smaller than the distance between the annular weft yarns corresponding to the second part. Thus, when rotating part (that is the blade) is nearer apart from the protection network, the protection network is opened shelves apart from (that is to say the interval between the adjacent annular weft) and is required for a short time, and when rotating part (that is to say the blade) is far away from the protection network, can increase and open shelves apart from (that is to say the interval between the adjacent annular weft), consequently, according to the distance of opening shelves of difference, reduces the extra resistance of fan, improves the efficiency of fan, reduces the noise.
In addition, the width of the folded edge formed by the guide folded edge is gradually reduced from the front edge to the rear edge. The wind resistance is reduced, the air flow dispersion is improved, and then, a larger air volume output is provided while satisfying the turbulence suppression effect.
Specifically, the width of the hem formed by the guide hem 2 is Y, wherein the width of the guide hem 2 at the position of the blade tip Y is R/100, and the width of the guide hem 2 far away from the position of the blade tip Y is R/200.
Referring to fig. 7, in this example, there are 8 tooth spaces 1f, and each two adjacent tooth spaces 1f form one comb tooth 1e, and the radius of the outer edge is R, and R is 475, as an example, as shown in the following table.
In summary, the present embodiment has the following advantages:
1) the blade body and the integrally formed flow guide folding edge formed by the special arc and the arc edges can prevent strong turbulence from being generated at the gap between the end part of the blade and the wall ring on one hand, and reduce noise statically; on the other hand, the large vortex can be effectively cut and carded into countless small vortices, and the viscous airflow of the blades 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 in a staggered manner in the thickness direction of the blade body, so that layered airflow can be combed, the efficiency of the blade is improved, and the noise is further reduced;
3) through angle and the width setting of water conservancy diversion hem, not only can reduce the windage, promote the work efficiency of flabellum moreover, the while noise reduction.
4) The distance between the annular wefts is changed along with the change of the blades and the protective net component, especially when the blade tips are far away from the protective net, through the increase of the distance between the annular wefts (or the increase of the opening distance), the extra resistance borne by the fan is reduced when the opening gap is large (or the air volume can be increased), and meanwhile, the noise is also reduced.
In addition, as can be seen from the combination of fig. 8 and fig. 9, after the blade of the present application is used, the working efficiency is significantly improved under the same air volume, and the noise caused during the working is significantly reduced.
Meanwhile, in the embodiment, the size of the angle formed by the guide folding edge and the back surface of the blade body and the gradual change of the angle are combined, the formed width of the guide folding edge is gradually changed, and the shape of the blade forms an integral scheme, so that the advantages of low noise, high efficiency and the like can be optimally realized.
The present invention has been described in detail, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the same, and the protection scope of the present invention should not be limited thereby, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (10)
1. A low noise, high efficiency axial flow fan comprising:
a motor;
a rotating blade assembly comprising a hub, a plurality of blades uniformly distributed around the circumference of the hub, wherein each of the blades comprises a blade body having a front surface and a back surface, the blade body having a connection end for connection with the hub, an outer edge remote from the connection end, and a leading edge and a trailing edge disposed on opposite sides of the outer edge;
the protective net component comprises a shaft collar, a plurality of circles of annular wefts which coaxially extend and are sequentially arranged at intervals and annularly arranged on the outer side of the shaft collar, and a plurality of warps which respectively extend along the direction of the shaft collar and are used for sequentially connecting the shaft collar and the plurality of circles of annular wefts,
the method is characterized in that:
comb teeth are formed on the rear edge, the blade further comprises a flow guide folding edge which is bent from the outer edge to the back of the blade body, and the flow guide folding edge, the outer edge and the front edge form a blade tip; the blade body faces the protective net component from the front side, the blade body is gradually bent towards the upstream direction from the hub to the blade tip, the rear edge where the comb teeth are located faces the protective net component, the front edge faces the upstream direction, and the distance from the blade tip to the air outlet net formed by the annular weft is larger than the minimum distance between the rear edge and the air outlet net.
2. The low-noise high-efficiency axial flow fan according to claim 1, wherein: the distance from the blade tip to the air outlet net is L1, the minimum distance between the rear edge and the air outlet net is Lmin, wherein L1 is more than or equal to 2 Lmin.
3. The low-noise high-efficiency axial flow fan according to claim 2, wherein: the back edge is from the connection end portion to the outer fringe extends and gradually keeps away from the air-out net, wherein the back 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 first part corresponds cyclic annular weft interval between the line is less than the second part corresponds cyclic annular weft interval between the line.
4. The low-noise high-efficiency axial flow fan according to claim 1, wherein: the rear edge is bent outwards from two end parts and is arc-shaped, and the comb teeth are distributed on the rear edge in sequence.
5. The low-noise high-efficiency axial flow fan according to claim 4, wherein: the outer edge is provided with a front end part and a rear end part, the front end part and the rear end part are arranged in an arc-shaped arch mode from the front end part to the rear end part far away from the connecting end part, the front end part and the rear end part are correspondingly formed on the connecting end part, the connecting line of the rear end part of the outer edge and the rear end part of the connecting end part is the chord length corresponding to the arc, the ratio of the chord length to the radius of the outer edge is z, and z is more than or equal to 1 and less than or equal to 1.2.
6. The low-noise high-efficiency axial flow fan according to claim 4, wherein: the area of each tooth socket is different in size, wherein each tooth socket is in a V shape, and the tip end of each tooth socket faces the inside of the rear edge; each comb tooth is correspondingly V-shaped, and the tip end of the comb tooth faces the outside of the blade body.
7. The low-noise high-efficiency axial flow fan according to claim 6, wherein: the radius of the outer edge is R, the tooth pitch 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 tips of each comb tooth are formed by drawing an arc from the front edge to the rear edge concentrically with the outer edge, the radius corresponding to each arc-shaped section is R, the chord length corresponding to each arc-shaped section is x, wherein R/R belongs to [ 0.50-1.00 ], R/H belongs to [ 1.00-1.60 ], and H/x belongs to [ 0.05-0.15 ].
8. The low-noise high-efficiency axial flow fan according to claim 1, wherein: the blade body is arranged from the middle of the back surface to the outside of the blade body in an arched mode along the length direction of the blade body, and the comb teeth are arranged on the orthographic projection surface of the blade body in the thickness direction in a staggered mode.
9. The low-noise high-efficiency axial flow fan according to claim 8, wherein: the front edge is bent inwards from the front end part of the outer edge and the front end part of the connecting end part and is arc-shaped, and the end part of the front edge far away from the connecting end part, the end part of the outer edge far away from the rear edge and the end part of the guide folding edge far away from the rear edge form the blade tip.
10. The low-noise high-efficiency axial flow fan according to claim 9, wherein: the guide folding edge is provided with an outer folding surface and an inner folding surface, the outer folding surface is in round angle transition with the front surface of the blade body, an angle formed between the inner folding surface and the back surface of the blade body is an obtuse angle, and the angle formed between the inner folding surface and the back surface of the blade body is gradually reduced from the front edge to the back edge;
the hem width formed by the diversion hem is gradually reduced from the front edge to the rear edge, wherein the hem width formed by the diversion hem is y, and R/200 is not less than y and not more than R/100.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120877325.3U CN214945135U (en) | 2021-04-26 | 2021-04-26 | Low-noise and high-efficiency axial flow fan |
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| CN202120877325.3U CN214945135U (en) | 2021-04-26 | 2021-04-26 | Low-noise and high-efficiency axial flow fan |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115450937A (en) * | 2021-04-26 | 2022-12-09 | 江苏富丽华通用设备股份有限公司 | Low-noise, high-efficiency and small-vortex axial flow fan |
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2021
- 2021-04-26 CN CN202120877325.3U patent/CN214945135U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115450937A (en) * | 2021-04-26 | 2022-12-09 | 江苏富丽华通用设备股份有限公司 | Low-noise, high-efficiency and small-vortex axial flow fan |
| CN115450937B (en) * | 2021-04-26 | 2023-12-29 | 江苏富丽华通用设备股份有限公司 | Low-noise, high-efficiency and small-vortex axial flow fan |
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