CN215672865U

CN215672865U - Axial flow fan blade and axial flow fan

Info

Publication number: CN215672865U
Application number: CN202121742908.1U
Authority: CN
Inventors: 周爱进; 沈坤华; 王勇; 杨洋
Original assignee: Jiangsu Fulihua General Equipment Co ltd; York Guangzhou Air Conditioning and Refrigeration Co Ltd; Johnson Controls Tyco IP Holdings LLP
Current assignee: Jiangsu Fulihua General Equipment Co ltd; York Guangzhou Air Conditioning and Refrigeration Co Ltd; Johnson Controls Tyco IP Holdings LLP
Priority date: 2021-07-29
Filing date: 2021-07-29
Publication date: 2022-01-28
Anticipated expiration: 2031-07-29

Abstract

The utility model relates to an axial flow fan blade and an axial flow fan, wherein the blade comprises a blade body, the blade body is provided with a connecting end part, an outer edge far away from the connecting end part, a front edge and a rear edge which are correspondingly arranged at two opposite sides of the outer edge, when the blade is installed, the blade body faces an air outlet area from the front side, and a plurality of comb teeth capable of effectively cutting and combing large eddy currents into countless small eddy currents are formed on the rear edge; the axial flow fan blade also comprises a flow guide folding edge which is bent from the outer edge to the back of the blade body. On one hand, the utility model can avoid strong turbulence generated at the gap between the end part of the blade and the wall ring, thereby reducing the noise; on the other hand, the vortex cutting and carding machine can effectively cut and card large vortex into countless small vortices and can effectively separate viscous airflow of the blades to form ideal airflow, so that the efficiency is high and the noise is low.

Description

Axial flow fan blade and axial flow fan

Technical Field

The utility model belongs to the field of fans, and particularly relates to an axial flow fan blade and an axial flow fan with the same.

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 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 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 radially 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 guide 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 overcome the defects of the prior art and provide an improved axial flow fan blade.

Meanwhile, the utility model also provides an axial flow fan.

In order to solve the technical problems, the technical scheme adopted by the utility model is as follows:

the utility model provides an axial fan blade, it includes the blade body, the blade body has the tip of being used for being connected with wheel hub, keep away from the tip of being connected, and correspond front edge and the trailing edge of setting in the relative both sides of outer fringe, the blade body has the front towards the air-out direction and the back corresponding with the front, wherein from the trailing edge to sunken a plurality of interval distribution's of formation tooth's socket in the blade body, form a broach between per two adjacent tooth's socket, the broach on the trailing edge can be combed into the little vortex with big vortex effectively cutting, axial fan blade still includes the water conservancy diversion hem of buckling to the back of blade body from the outer fringe.

Preferably, the outer rim has a first end and a second end relatively close to and remote from the hub center, and the connecting end corresponds to the outer rim and is formed with a third end and a fourth end, wherein the first end and the third end form a trailing edge therebetween and the second end and the fourth end form a leading edge therebetween.

The outer edge, the front edge and the rear edge are all arc-shaped, the corresponding radiuses are R, R1 and R2 respectively, the outer edge protrudes from the first end portion and the second end portion to the direction far away from the connecting end portion, the front edge protrudes from the second end portion and the fourth end portion to the side where the rear edge is located, the rear edge protrudes from the first end portion and the third end portion to the direction far away from the front edge, and R1 is equal to or larger than R2 is equal to or smaller than R.

Preferably, the connecting end part protrudes from the third end part and the fourth end part to the front edge side and is in a circular arc shape with the radius of R3, wherein R3 is more than or equal to R1 is more than or equal to R2 is more than or equal to R, and the connecting part of the third end part and the fourth end part is respectively connected with the front edge end part and the rear edge end part in a rounded transition mode. Here, the circular arc setting of connection tip, the installation of being convenient for, simultaneously in the fillet transition, reduce the resistance, noise reduction moreover.

According to a further embodiment and preferred aspect of the present invention, the blade body is arched from the front to the back from the side where the leading edge and the trailing edge are located, and the guide folds are arched from both end portions to the back. Thus, the plurality of comb teeth are arranged irregularly on the orthographic projection surface of the blade body in the thickness direction, so that the layered airflow can be combed, the efficiency of the blade is further improved, and the noise is further reduced.

The arched part is positioned in the middle of the blade body and the guide folding edge and is in an arc shape with the radius of R4, wherein R4 is not less than R2.6R, R4 is 2.2R in the embodiment, and at the moment, the air volume from the blade is large and the noise is low.

Preferably, the area of each gullet is of unequal size. In this way, 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, and the effect of cutting and combing the blade can be improved.

Each tooth socket is V-shaped, and the tip end of each tooth socket faces the inside of the rear edge; each comb tooth is correspondingly in a V shape. Thus, the comb teeth can be conveniently machined and formed.

According to another specific implementation and preferable aspect of the utility model, the tooth pitch between every two adjacent comb teeth is gamma, the tooth height of each comb tooth is H, an arc is drawn from the front edge to the rear edge concentrically with the outer edge to form a plurality of arc sections passing through the tooth tip of each comb tooth, the corresponding radius of the arc sections is R, and the corresponding chord length of the arc sections is x, wherein R/R is in the range of 0.50 to 1.00, gamma/H is in the range of 1.00 to 1.60, and H/x is in the range of 0.05 to 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 relationship between the R/R value and the γ/H value satisfies the following formula: Y-12.295X 2+19.976X-6.7155, wherein X corresponds to R/R values and Y corresponds to γ/H values. In this connection, the comb teeth are formed to achieve the desired effect.

According to a further embodiment and preferred aspect of the utility model, the guide flange has an inward-folded surface facing the connecting end and an outward-folded surface opposite to the inward-folded surface, wherein the outward-folded surface is in rounded transition with the front surface of the blade body, and the inward-folded surface forms an included angle a with the back surface of the blade body, and the included angle a is an 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 gradually smaller from the front end portion of the outer edge toward the rear end portion of the outer edge. The formed flow guide effect is optimal, and the noise is reduced.

Furthermore, the angle A is more 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 gradually becomes smaller from the front end part of the outer edge to the rear end part of the outer 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.

Preferably, the width of the hem formed by the diversion hem is w, wherein R/200 is more than or equal to w and less than or equal to R/100.

Specifically, the diversion folded edge is provided with a fifth end part and a sixth end part, the diversion folded edge is in an arc shape from the fifth end part and the sixth end part to the side far away from the connecting end part, and the radius of the diversion folded edge is equal to that of the outer edge.

Preferably, the fifth end is connected with the second end, the sixth end is connected with the first end, wherein the fifth end is located on the side where the connecting line of the second end and the fourth end is relatively far away from the front edge, and the fifth end of the guide folding edge, the second end of the outer edge and the end of the front edge far away from the connecting end form a blade tip. 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.

The other technical scheme of the utility model is as follows: the utility model provides an axial fan, includes wheel hub, blade and wind-guiding circle, and the blade is foretell axial fan blade, and axial fan blade has two at least, and wherein two or the multichip is round wheel hub's circumference evenly distributed, and connect the tip on wheel hub from the connection, axial fan blade's front towards the air-out end of wind-guiding circle.

Due to the implementation of the technical scheme, compared with the prior art, the utility model has the following advantages:

on one hand, the utility model can avoid strong turbulence generated at the gap between the end part of the blade and the wall ring, thereby reducing the noise; on the other hand, the vortex cutting and carding machine can effectively cut and card large vortex into countless small vortices and can effectively separate viscous airflow of the blades to form ideal airflow, so that the efficiency is high and the noise is low.

Drawings

Fig. 1 is a schematic structural view of an axial flow fan of the utility model;

FIG. 2 is a schematic front view of an axial flow fan blade according to the present invention;

FIG. 3 is a schematic view of the back side structure of an axial flow fan blade of the present invention;

FIG. 4 is a schematic view of the distribution of the comb teeth of the axial flow fan blade of the present invention;

FIG. 5 is a schematic sectional view taken along line A-A in FIG. 4;

FIG. 6 is a graph showing the comparative curves of air volume and efficiency before and after the implementation of the vane;

FIG. 7 is a graph showing the comparative curves of the air volume and the noise before and after the implementation of the vane;

wherein: A. a hub;

B. an axial flow fan blade; 1. a blade body; a. a front side; b. a back side; 1a, connecting end parts; 1b, outer edge; 1c, leading edge; 1d, trailing edge; 1e, comb teeth; 1e, tooth grooves; 2. flow guiding and edge folding;

C. a wind guide ring;

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 axial flow fan of the present embodiment includes a hub a, blades B of the axial flow fan, and an air guide ring C, wherein the blades B have five blades and are uniformly distributed around the circumference of the hub a.

Specifically, axial fan blade B 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.

As shown in fig. 2 and fig. 3, the blade body 1 has a front surface a and a back surface b, and the blade body 1 further has a connection end 1a, an outer edge 1b far away from the connection end 1a, and a front edge 1C and a rear edge 1d correspondingly disposed on two opposite sides of the outer edge 1b, when the blade body 1 is installed, the front surface a faces the air guiding ring C, that is, the front surface a faces the air outlet direction, and the back surface b is a surface corresponding to the front surface a.

Specifically, the outer rim 1b has a first end and a second end relatively close to and far from the center of the hub a, and the connecting end 1a corresponds to the outer rim 1b and is formed with a third end and a fourth end, wherein a trailing edge 1d is formed between the first end and the third end, and a leading edge 1c is formed between the second end and the fourth end.

Referring to fig. 4, in this embodiment, the connecting end 1a, the outer edge 1b, the front edge 1c, and the rear edge 1d are all arc-shaped, and the corresponding radii are R, R1, R2, and R3, respectively, where R3 is not less than R1 is not less than R2 is not less than R.

Specifically, the connection end portion 1a protrudes from the third end portion and the fourth end portion toward the outer edge 1 b; the outer edge 1b projects from the first end and the second end in a direction away from the connecting end 1a, the front edge 1c projects from the second end and the fourth end in a direction toward the rear edge 1d, and the rear edge 1d projects from the first end and the third end in a direction away from the front edge 1 c.

In this example, the blade body 1 is arched from the front surface a to the back surface b from the side where the front edge 1c and the back edge 1d are located, the guide folding edge 2 is bent from the outer edge 1b to the back surface b and forms a fifth end portion and a sixth end portion, wherein the fifth end portion is connected with the second end portion, the sixth end portion is connected with the first end portion, and the arrangement of the arc-shaped connecting end portion 1a, the outer edge 1b, the front edge 1c and the back edge 1d determines the shape of the blade.

Specifically, the diversion folded edge 2 is arc-shaped from the fifth end part and the sixth end part to the side far away from the connecting end part 1a, wherein the radius of the diversion folded edge 2 is equal to that of the outer edge 1 b.

Meanwhile, the fifth end part is positioned at the side where the connecting line of the second end part and the fourth end part is relatively far away from the front edge 1c,

in this way, the fifth end of the guide flange 2, the second end of the outer edge 1b and the end of the front edge 1c remote from the connecting end 1a form a blade tip Y, wherein the fifth end is in rounded transition. 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.

In this example, the arc of the front edge 1c is arranged to reduce wind resistance and further reduce noise; the arc arrangement of the rear edge 1 ensures that the comb teeth are not distributed in an aligned manner, so that the effect of cutting and carding large eddy can be improved, and the eddy is avoided; the arc arrangement of the outer edge 1b is more favorable for the formation of the blade tip, and meanwhile, the part which is firstly contacted with the airflow is the blade tip, so that the blade tip is not easy to block; the third end part and the fourth end part are respectively in fillet transition with the end parts of the front edge 1c and the rear edge 1 d. Here, the circular arc setting of connection tip, the installation of being convenient for, simultaneously in the fillet transition, reduce the resistance, noise reduction moreover.

In this example, a plurality of comb teeth 1f 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 1f are distributed in order between the first end portion and the third end portion.

Specifically, a plurality of tooth grooves 1e are formed by sinking from the side edge of the arc where the rear edge 1d is located to the front edge 1c, a comb tooth 1f and a comb tooth 1f are formed between every two adjacent tooth grooves 1e, and the area of each tooth groove 1e is different in size. In this way, 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, and the effect of cutting and combing the small vortices of the blade can be improved.

In this example, each tooth space 1e is formed in a "V" shape, and the tip thereof is disposed toward the trailing edge 1 d; each comb tooth 1f is correspondingly in a V shape.

Meanwhile, the plurality of comb teeth 1f are arranged irregularly on the orthographic 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.

Specifically, the guide folding edge 2 has an outer folding surface 2a and an inner folding surface 2b, wherein the outer folding surface 2a and the front surface a of the blade body 1 are in arc transition, 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 second end portion toward the first end portion. The formed flow guide effect is optimal, and the noise reduction effect is more obvious.

In this example, a angle α of 156 ° is formed between the folded-in surface 2b at the second end and the back surface b of the blade body 1, and an angle β of 132 ° is formed between the folded-in surface 2b at the first end and the back surface b of the blade body 1. Not only can reduce the windage, but also disperse the air current, reduce the noise.

In addition, the width of the guide flange 2 is gradually reduced from the second end to the first end. 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 guide folding edge 2 at the second end is R/100, and the width of the guide folding edge 2 at the first end is R/200.

In this example, there are 8 tooth spaces 1e, and every two adjacent tooth spaces 1e form a comb tooth 1f, wherein the tooth pitch between every two adjacent comb teeth is γ, the tooth height of each comb tooth is H, and an arc is drawn from the front edge to the rear edge concentrically with the outer edge to form a plurality of arc segments passing through the tooth tip of each comb tooth, the radius corresponding to the arc segments is r, and the chord length corresponding to the arc segments is x.

Specifically, the relationship among γ, H, R, and x is shown in the following table, taking the radius R of the outer edge 1b as 475 as an example.

Meanwhile, let X be R/R, Y be γ/H, and the following formula is satisfied between X and the corresponding value of Y: Y-12.295X²+19.976X-6.7155, that is, only the designed comb teeth satisfying the above relationship can achieve the technical effect expected by the present application.

As shown in fig. 5, the camber is located in the middle of the blade body 1 and has an arc shape with a radius R4, where R4 is 2.2R, which is the best effect.

In summary, the present embodiment has the following advantages:

1) the blade body and the integrally formed flow guide folding edge which are 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, 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.

In addition, as shown in fig. 6 and fig. 7, it can be seen visually that 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 utility model and to practice it, and it is not intended to limit the scope of the utility model, and all equivalent changes and modifications made according to the spirit of the present invention should be covered by the present invention.

Claims

1. The utility model provides an axial fan blade, its includes the blade body, the blade body have be used for with wheel hub be connected the tip, keep away from the tip of connection, and correspond the setting and be in the leading edge and the trailing edge of the relative both sides of outer fringe, the blade body have the front towards the air-out direction and with the corresponding back in front, its characterized in that: the axial flow fan blade further comprises a flow guide folding edge bent from the outer edge to the back of the blade body.

2. The axial fan blade according to claim 1, wherein: the outer rim has a first end and a second end relatively close to and far from the center of the hub, and the connecting end corresponds to the outer rim and is formed with a third end and a fourth end, wherein the trailing edge is formed between the first end and the third end, and the leading edge is formed between the second end and the fourth end.

3. The axial fan blade according to claim 2, wherein: the outer edge and the front edge are both arc-shaped, the corresponding radiuses are R and R1 respectively, the outer edge protrudes from the first end portion and the second end portion towards the direction far away from the connecting end portion, the front edge protrudes from the second end portion and the fourth end portion towards the side where the rear edge is located, and R1 is not more than R.

4. The axial fan blade according to claim 3, wherein: the rear edge protrudes from the first end part and the third end part to the direction far away from the front edge to form an arc shape, wherein the radius of the arc shape is R2, and R1 is not less than R2 is not less than R.

5. The axial fan blade according to claim 2 or 3, wherein: the connecting end part protrudes from the third end part and the fourth end part to the outer edge side and is in a circular arc shape with the radius of R3, wherein R3 is more than or equal to R1 is more than or equal to R2 is more than or equal to R, and the connecting part of the third end part and the fourth end part with the front edge end part and the rear edge end part respectively is in fillet transition.

6. The axial fan blade according to claim 1, wherein: the blade body is arranged from the front side to the back side of the side where the front edge and the rear edge are located in an arched manner, and the flow guide folding edges are arranged from two end parts to the back side in an arched manner.

7. The axial fan blade according to claim 6, wherein: the arch is positioned in the middle of the blade body and the flow guide folding edge and is in an arc shape with the radius of R4, wherein R4 is not less than R4 and not more than 2.6R.

8. The axial fan blade according to claim 3, wherein: each tooth socket is V-shaped, the tooth pitch between every two adjacent comb teeth is gamma, the tooth height of each comb tooth is H, the tooth socket is concentric with the outer edge and forms a plurality of arc sections passing through the tooth tip of each comb tooth from the front edge to the rear edge in an arc shape, the radius corresponding to each arc section is R, the chord length corresponding to each arc section is x, wherein R/R belongs to [ 0.50-1.00 ], gamma/H belongs to [ 1.00-1.60 ], and H/x belongs to [ 0.05-0.15 ].

9. The axial fan blade according to claim 8, wherein: x is R/R, Y is gamma/H, and the value of X and the corresponding Y satisfies the formula: Y-12.295X 2+ 19.976X-6.7155.

10. The axial fan blade according to claim 3, wherein: the flow guide folding edge is provided with an inward folding surface facing the connecting end part and an outward folding surface opposite to the inward folding surface, the outward folding surface and the front surface of the blade body are in round angle transition, and an included angle A is formed between the inward folding surface and the back surface of the blade body, wherein the included angle A is an obtuse angle.

11. The axial fan blade according to claim 10, wherein: the angle formed between the inward folding surface and the back surface of the blade body is gradually reduced from the second end part to the first end part.

12. The axial fan blade according to claim 10 or 11, wherein: the angle A is more than or equal to 120 degrees and less than or equal to 160 degrees.

13. The axial fan blade according to claim 10, wherein: the folding width of the flow guide folding edge is gradually reduced from the second end part of the outer edge to the first end part of the outer edge.

14. The axial fan blade according to claim 13, wherein: the width of the folded edge formed by the diversion folded edge is w, wherein the w is more than or equal to R/200 and less than or equal to R/100.

15. The axial fan blade according to claim 13, wherein: the flow guide folding edge is provided with a fifth end part and a sixth end part, the flow guide folding edge is arc-shaped from the fifth end part and the sixth end part to the side far away from the connecting end part, and the radius of the flow guide folding edge is equal to that of the outer edge.

16. The axial fan blade according to claim 15, wherein: the fifth end part is connected with the second end part, the sixth end part is connected with the first end part, the fifth end part is positioned on the side where the connecting line of the second end part and the fourth end part is relatively far away from the front edge, and the fifth end part of the flow guide folding edge, the second end part of the outer edge and the end part of the front edge far away from the connecting end part form a blade tip.

17. The utility model provides an axial fan, includes wheel hub, blade and wind-guiding circle, its characterized in that: the blade is the axial flow fan blade of any one of claims 1 to 16, and the axial flow fan blade has at least two blades, wherein two or more blades are uniformly distributed around the circumference of the hub, and are connected to the hub from the connecting end, and the front surface of the axial flow fan blade faces the air outlet end of the air guide ring.