CN115450937A

CN115450937A - Low-noise, high-efficiency and small-vortex axial flow fan

Info

Publication number: CN115450937A
Application number: CN202211293421.9A
Authority: CN
Inventors: 周爱进; 沈坤华; 叶信学
Original assignee: Jiangsu Fulihua General Equipment Co ltd
Current assignee: Jiangsu Fulihua General Equipment Co ltd
Priority date: 2021-04-26
Filing date: 2021-04-26
Publication date: 2022-12-09
Anticipated expiration: 2041-04-26
Also published as: CN113250983A; CN115573931B; CN113250983B; CN115450937B; CN115573931A

Abstract

The invention relates to a low-noise, high-efficiency and small-vortex axial flow fan, which comprises a motor, a rotating blade assembly and a protective net assembly, wherein the rotating blade assembly comprises a hub and blades, each blade comprises a blade body and a flow guide folding edge, the flow guide folding edge, an outer edge and a front edge form a blade tip, the distance from the blade tip to an air outlet net formed by annular weft threads is greater than the minimum distance between a rear edge and the air outlet net, the rear edge extends from a rear connecting end part to the outer edge and gradually keeps away from the air outlet net, the rear edge comprises a first part and a second part, and the distance between the annular weft threads corresponding to the first part is smaller than the distance between the annular weft threads corresponding to the second part; the comb teeth are distributed on the rear edge in sequence. According to different opening distances, the extra resistance of the fan is reduced, the efficiency of the fan is improved, and the noise is reduced; and the device can effectively cut large vortex, the layered airflow is combed into countless small vortices, and the viscous airflow of the blades can be effectively separated to form ideal airflow, so that strong turbulence is avoided.

Description

Low-noise, high-efficiency and small-vortex axial flow fan

The application is a divisional application with the application date of 2021, 26.4.63. 202110456621.0 and named as a low-noise and high-efficiency axial flow fan.

Technical Field

The invention belongs to the field of fans, and particularly relates to an axial flow fan with low noise, high efficiency and small vortex.

Background

The 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 quality of the axial flow fan greatly affects the efficiency and the noise of the fan, and along with the improvement of the energy efficiency of an air conditioner in China, 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 large eddy generated at the air outlet into countless small eddy, can not effectively separate viscous airflow of the blade, can not play a role in guiding, can not form ideal airflow, 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 axial flow fan with low noise, high efficiency and small vortex.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a low noise, high efficiency, low vortex axial flow fan comprising:

a motor;

a rotating blade assembly comprising a hub, a plurality of blades evenly distributed around the circumference of the hub, wherein each of the blades comprises a blade body having a front face and a back face, the blade body having a rear connection end for connection to the hub, an outer edge remote from the rear connection end, and a leading edge and a trailing edge disposed on opposite sides of the outer edge;

a protection net assembly comprising a collar, a plurality of turns of an annular weft, a plurality of warps for sequentially connecting the collar and the plurality of turns of the annular weft, particularly,

the blade body is arched from the middle part of the back surface to the outside of the blade body along the length direction of the blade body, a plurality of tooth grooves distributed at intervals are formed by sinking the rear edge into the blade body, a comb tooth is formed between every two adjacent tooth grooves, the rear edge is bent outwards from two end parts to the blade body and is arc-shaped, the plurality of comb teeth are sequentially distributed on the rear edge, and the plurality of comb teeth are arranged on the orthographic projection surface of the blade body in the thickness direction in a staggered manner;

the blade also 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, the distance from the blade tip to the air outlet net formed by the annular weft threads 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 leaves away from the air outlet net, the rear edge comprises a first portion close to the air outlet net and a second portion gradually far away from the air outlet net, and the distance between the annular weft threads corresponding to the first portion is smaller than the distance between the annular weft threads corresponding to the second portion.

When rotary part (also be the blade) is nearer apart from the protection network, the protection network is opened shelves distance (also be the interval between the adjacent annular weft) and is required for a short time, when rotary part (also be the blade) is far away apart from the protection network, can increase and open shelves distance (also be 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, 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 is arranged towards the rear edge; and/or each comb tooth is correspondingly in a V shape, and the tip end part of each comb tooth faces the outside of the blade body. 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.

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 draws an arc from the front edge to the rear edge to form a plurality of arc sections passing through the tooth tips of each comb tooth, the radius corresponding to the arc sections is R, and the chord length corresponding to the arc sections is x, wherein R/R belongs to 0.50-1.00, gamma/H belongs to 1.061297220-1.423966942, 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.

According to a specific embodiment and preferred aspect of the invention, the distance from the blade tip to the air-out net is L1, and the minimum distance between the rear edge and the air-out net is Lmin, wherein L1 is more than or equal to 2Lmin. 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.

Preferably, the front edge is bent inwards from the front end part of the outer edge and the front end part of the rear connecting end part and is in an arc shape, and the end part of the front edge far away from the rear 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. The arrangement of the blade tip reduces noise and improves efficiency; 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 a further embodiment and preferred aspect of the invention, the guide flange has an outer flange surface and an inner flange surface, wherein the outer flange surface is in rounded transition with the front surface of the blade body, and the inner flange surface forms an obtuse angle with the back surface of the blade body. 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.

Preferably, a plurality of circles of annular weft threads are arranged on the outer side of the shaft collar at intervals in sequence, and each warp thread extends along the direction of the shaft collar.

Further, axial fan still has outer connecting seat, and wherein the protection net subassembly is located one side of outer connecting seat, just cyclic annular weft still has certainly the axile is to outer connecting seat and the enclosing of internal diameter grow gradually establish the district, warp keeps away from the tip of axile passes through the connecting strip and will enclose the relative fixed connection of a plurality of cyclic annular weft who establishes the district.

Preferably, the motor is located between the hub and the protection net assembly, and the 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 opening distances, the extra resistance of the fan is reduced, the efficiency of the fan is improved, and the noise is reduced; and the device can effectively cut large vortex, the layered airflow is combed into countless small vortices, and the viscous airflow of the blades can be effectively separated to form ideal airflow, so that strong turbulence is avoided.

Drawings

FIG. 1 is a schematic perspective view of a low-noise, high-efficiency, small-vortex axial flow fan according to the present invention;

FIG. 2 is a schematic front view of FIG. 1;

FIG. 3 isbase:Sub>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 between the air volume and efficiency before and after the implementation of a low-noise, high-efficiency, small-vortex axial flow fan;

FIG. 9 is a schematic diagram showing a comparison curve of air volume and noise before and after the implementation of a low-noise, high-efficiency and small-vortex axial flow fan;

wherein: A. a motor;

B. a rotating blade assembly; b1, a hub; b2, blades; 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. guiding and folding edges;

C. a protective screen assembly; c1, a collar; c2, annular weft; c3, warp threads; 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 embodiment in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and therefore the application is not limited to the specific embodiments disclosed below.

As shown in fig. 1, the low-noise, high-efficiency, small-vortex 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, and 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 hub B1, and the motor a is located between the hub B1 and the protection net assembly C, wherein the output shaft of the motor a passes through the hub B1.

Specifically, blade B2 includes blade body 1 and water conservancy diversion hem 2, and wherein blade body 1 and water conservancy diversion hem 2 integrated into one piece set up.

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 efficiently into innumerable small vortices 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 net assembly C includes a collar C1, a plurality of circles of annular wefts C2 extending coaxially and arranged at intervals in sequence and annularly arranged outside the collar C1, and a plurality of warps C3 extending along the direction of the collar C1 and connecting the collar C1 and the plurality of circles of annular wefts C2 in sequence.

Specifically, the protective net component C can be referred to as ZL202021538744.6, and is not repeated here.

In this embodiment, the low-noise, high-efficiency, small-vortex axial flow fan further includes an outer connecting seat D, wherein the protective mesh component C is located on one side of the outer connecting seat D, the annular weft C2 further includes an enclosing region gradually increasing from the collar C1 to the outer connecting seat D, and the end of the warp C3 away from the collar C1 relatively and fixedly connects the plurality of annular weft C2 in the enclosing region through the connecting strip C4.

As shown in fig. 4, the front face faces the protective net assembly 2, the blade body 1 gradually curves in the upstream direction from the hub B1 to the blade tip Y, the rear edge 1d where the comb teeth 1e are located faces the protective net assembly C, the front edge 1C faces the upstream direction, a distance from the rear portion of the rear edge 1d to the protective net assembly C is smaller than a distance from the blade tip Y located at the front portion of the rear edge 1d to the protective net assembly C, and a distance between the annular wefts C2 corresponding to the rear portion of the rear edge 1d is smaller than a 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 the longitudinal direction thereof, the rear edge 1d is curved outward from the front and rear end portions toward the blade body 1, the front edge 1c is curved inward from the front and rear end portions 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, the front and rear end portions are correspondingly formed on the rear connecting end portion 1a, wherein a connecting line between the rear end portion of the outer edge 1b and the rear end portion of the rear connecting end portion 1a is a chord length corresponding to the arc, and the chord length is set according to the radius of the outer edge, so that the arc angle and the arc length can be determined more conveniently.

Meanwhile, in this example, a plurality of comb teeth 1e capable of cutting and combing a large vortex efficiently into innumerable small vortices are formed on the rear 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 rear connecting end 1a and is arc-shaped, wherein the end of the front edge 1c away from the rear connecting end 1a, the end of the outer edge 1b away from the rear edge 1d, and the end of the guide folding edge 2 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 is formed between the folded-in surface 2b where the tip Y is located and the back surface b of the blade body 1, and a angle 2 is formed between the folded-in surface 2b where the tip Y is located and the back surface b of the blade body 1 apart from the tip Y end =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, the minimum distance Lmin between the rear edge and the air outlet net is Lmin, wherein L1 is more than or equal to 2Lmin. 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 rear connecting end part to the outer edge and gradually leaves 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 leaving 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. So, when rotary part (also be the blade) is nearer apart from the protection network, the protection network is opened a grade distance (also be the interval between the adjacent cyclic annular weft) and is required for a short time, when rotary part (also be the blade) is far away apart from the protection network, can increase and open a grade distance (also be the interval between the adjacent cyclic annular weft), consequently, according to the distance of opening a grade of difference, reduces the extra resistance of fan, improves the efficiency of fan, reduces the noise.

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.

As shown in fig. 7, there are 8 tooth spaces 1f in this example, and each two adjacent tooth spaces 1f form a comb tooth 1e, taking the radius of the outer edge as R and R =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 a gap between the end part of the blade and the wall ring on one hand, so that the 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 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 increasing of the distance between the annular wefts (or increasing the opening distance), the extra resistance borne by the fan when the opening gap is large can be reduced (or the air volume can be increased), and meanwhile, the noise can also be 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 in order to enable those skilled in the art to understand the invention and to practice it, and it is not intended to limit the scope of the invention, and all equivalent changes and modifications made according to the spirit of the present invention should be covered by the present invention.

Claims

1. A low noise, high efficiency, low vortex axial flow fan comprising:

a motor;

a rotating blade assembly comprising a hub, a plurality of blades evenly distributed around the circumference of the hub, wherein each of the blades comprises a blade body having a front face and a back face, the blade body having a rear connection end for connection to the hub, an outer rim remote from the rear connection end, and a leading edge and a trailing edge disposed on opposite sides of the outer rim;

protection network subassembly, it includes the shaft collar, many rings of cyclic annular weft, many are used for connecting gradually the shaft collar and many rings the warp of cyclic annular weft, its characterized in that:

2. The low noise, high efficiency, low vortex axial flow fan of claim 1, 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; and/or each comb tooth is correspondingly V-shaped, and the tip end part of the comb tooth faces the outside of the blade body.

3. The low noise, high efficiency, low vortex axial flow fan of claim 2, 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 arcs 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 ], gamma/H belongs to [ 1.061297220-1.423966942 ], and H/x belongs to [ 0.05-0.15 ].

4. The low noise, high efficiency, low vortex axial flow fan of claim 1, wherein: the distance from the blade tip to the air outlet net is L1, the minimum distance Lmin between the rear edge and the air outlet net is Lmin, wherein L1 is more than or equal to 2Lmin.

5. The low noise, high efficiency, low vortex axial flow fan of claim 1, 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 connecting end part, the front end part and the rear end part are correspondingly formed on the rear connecting end part, the front edge is inwards bent from the front end part of the outer edge and the front end part of the rear connecting end part and is in an arc shape, the end part of the front edge far away from the rear connecting end part, the end part of the outer edge far away from the rear edge and the end part of the flow guide folding edge far away from the rear edge form the blade tip.

6. The low noise, high efficiency, low vortex axial flow fan of claim 5, wherein: the width of the folded edge formed by the flow guide folded edge is gradually reduced from the front edge to the rear edge; and/or the flow guide folding edge is provided with an outer folding surface and an inner folding surface, the outer folding surface and the front surface of the blade body are in round angle transition, 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 rear edge.

7. The low noise, high efficiency, low vortex axial flow fan of claim 6, wherein: an 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 more than or equal to 120 degrees and less than or equal to 160 degrees; and/or the width of a folded edge formed by the guide folded edge is y, the radius of the outer edge is R, wherein R/200 is more than or equal to y and less than or equal to R/100.

8. The low noise, high efficiency, low vortex axial flow fan of claim 1, wherein: the rings that many circles cyclic annular woofs were arranged in proper order at interval locate the axle collar outside, every warp extends along the direction of axle collar.

9. The low noise, high efficiency, low vortex axial flow fan of claim 1, wherein: axial fan still has outer connecting seat, and wherein protection net subassembly is located one side of outer connecting seat, just cyclic annular weft still has certainly the axle ring is to enclosing of outer connecting seat and internal diameter grow gradually establishes the district, warp keeps away from the tip of axle ring will enclose the relative fixed connection of a plurality of cyclic annular weft in establishing the district through the connecting strip.

10. The low noise, high efficiency, low vortex axial flow fan of claim 1, wherein: the motor is located between the wheel hub and the protective net assembly, and an output shaft of the motor penetrates through the wheel hub.