CN204371777U - Fan blade and there is its fan - Google Patents

Abstract

The utility model discloses a wind blade and a fan with the same. The wind blade comprises: an outer hub, an inner hub, a plurality of inner blades and a plurality of outer blades with the same structure, the inner hub is arranged in the outer hub, and the plurality of inner blades are connected Between the outer peripheral wall of the inner hub and the inner peripheral wall of the outer hub and spaced apart in the circumferential direction of the inner hub, a plurality of outer blades are connected to the outer peripheral wall of the outer hub and spaced apart in the circumferential direction of the outer hub, wherein each outer The cross-section of the blade is formed as an airfoil. According to the wind blade of the utility model, by arranging a plurality of inner blades and a plurality of outer blades, the concentration of wind force can be ensured, and the problem of premature divergence of the wind sent by the inner blades to prevent long-distance air supply can be avoided, thereby lengthening the air supply distance , and because multiple outer blades are airfoil blades with the same structure, the aerodynamic performance of a single outer blade and the overall aerodynamic performance of multiple outer blades can be improved, thereby improving the aerodynamic performance of the fan blade and reducing the power of the fan blade Consumption, saving energy.

Description

Wind blade and fan with same

technical field

The utility model relates to the field of fan equipment, in particular to a fan blade and a fan with the same.

Background technique

In the single-layer fan blade structure in the related art, the wind blown out is more serious, and a higher power is required to blow the wind far away, so the energy consumption is large. In the related art, a double-layer fan blade structure has appeared, which can ensure the concentration of wind force and achieve a relatively long air supply distance. However, because the inner blades of the double-layer fan blades in the related art are relatively small, and the overall speed of the fan blades is relatively low, it has little effect on the overall air flow, and because the structure of the blades is too random, it may bring adverse effects on the flow. As a result, the overall aerodynamic performance of the fan blade is not good, and the advantages are not obvious.

Utility model content

The utility model aims at at least solving one of the technical problems existing in the prior art. For this reason, the utility model is to propose a fan blade, and the fan blade has good aerodynamic performance.

The utility model also proposes a fan with the above-mentioned fan blades.

The fan blade according to the first aspect of the present utility model includes: an outer hub; an inner hub, the inner hub is arranged in the outer hub; a plurality of inner blades, the plurality of inner blades are connected to the outer periphery of the inner hub between the wall and the inner peripheral wall of the outer hub and at intervals in the circumferential direction of the inner hub; and a plurality of outer blades with the same structure, the plurality of outer blades are connected to the outer peripheral wall of the outer hub and The outer blades are arranged at intervals in the circumferential direction of the outer hub, wherein the cross-section of each of the outer blades is formed as an airfoil.

According to the wind blade of the utility model, by arranging a plurality of inner blades and a plurality of outer blades, the concentration of wind force can be ensured, and the problem of premature divergence of the wind sent by the inner blades to prevent long-distance air supply can be avoided, thereby lengthening the air supply distance , and because multiple outer blades are airfoil blades with the same structure, the aerodynamic performance of a single outer blade and the overall aerodynamic performance of multiple outer blades can be improved, thereby improving the aerodynamic performance of the fan blade and reducing the power of the fan blade Consumption, saving energy.

Specifically, the structures of the plurality of inner blades are the same, and the cross-sectional shape of each inner blade is formed as an airfoil.

Specifically, the cross-sectional shape of each inner blade and/or the cross-sectional shape of each outer blade is formed as a Goe118 airfoil, a Goe115 airfoil, a Goe123 airfoil, a NACA0006 airfoil or a NACA6409 airfoil.

Further, each of the inner blades and each of the outer blades is formed as a curved and twisted blade, and the outer edge inlet angle β1 and the inner edge inlet angle β2 of each of the inner blades satisfy the relationship: β1<β2, The outer edge inlet angle α1 and the inner edge inlet angle α2 of each of the outer blades satisfy the relationship: α1<α2.

Specifically, the α1 satisfies: 10°≤a1≤15°, and the α1 and the α2 further satisfy: α1+5°≤α2≤α1+10°.

Preferably, along the radial direction of the inner hub from the inside to the outside, the intake angle of each of the inner blades gradually decreases, and along the radial direction of the inner hub from the inside to the outside, each of the outer The inlet angles of the blades gradually decrease, and the minimum inlet angles of the inner blades are greater than the maximum inlet angles of the outer blades.

Specifically, the axial width of the outer blade is equal to the axial width of the inner blade.

Specifically, the projection of the line connecting the leading edge point of the outer edge and the leading edge point of the inner edge of each of the inner blades in a reference plane perpendicular to the rotation axis of the blade is a straight line, and each of the inner blades The projection of the line connecting the outer edge trailing edge point and the inner edge trailing edge point in the reference plane is a straight line, and the connection line between the outer edge leading edge point and the inner edge leading edge point of each outer blade is in the reference plane. The projection in the plane is a curve, and the projection of the line connecting the trailing edge point of the outer edge and the trailing edge point of the inner edge of each of the outer blades in the reference plane is a curve.

Specifically, the outer diameter D2 of the outer hub and the diameter D1 of the fan blade satisfy the relationship: D2≤0.5D1.

The fan according to the second aspect of the utility model includes the fan blade according to the first aspect of the utility model.

According to the fan of the present utility model, the overall performance of the fan is improved by arranging the fan blade of the first aspect.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

Fig. 1 is a perspective view of a fan blade according to an embodiment of the present invention;

Fig. 2 is a front view of the wind blade shown in Fig. 1;

Fig. 3 is a rear view of the wind blade shown in Fig. 1;

Fig. 4 is a side view of the wind blade shown in Fig. 1;

Fig. 5 is a partially developed schematic view of the inner edge section and the outer edge section of the outer blade shown in Fig. 1 .

Reference signs:

100: wind blade;

1: Outer hub; 2: Inner hub; 21: Mounting hole;

3: inner blade; 3a: inner edge of inner blade; 3b: outer edge of inner blade;

       3c: the leading edge of the inner blade; 3d: the trailing edge of the inner blade;

4: outer leaf; 4a: inner edge of outer leaf; 4b: outer edge of outer leaf;

4c: leading edge of outer blade; 4d: trailing edge of outer blade.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

The following disclosure provides many different embodiments or examples for realizing different structures of the present invention. To simplify the disclosure of the present invention, components and arrangements of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the utility model. Furthermore, the present invention may repeat reference numerals and/or letters in different instances. This repetition is for the purpose of simplicity and clarity and does not in itself indicate a relationship between the various embodiments and/or arrangements discussed. In addition, various specific process and material examples are provided herein, but one of ordinary skill in the art will recognize the applicability of other processes and/or the use of other materials.

The fan blade 100 according to the embodiment of the first aspect of the present utility model will be described below with reference to FIGS. 1-5 .

As shown in FIG. 1 , the fan blade 100 according to the embodiment of the first aspect of the present invention includes: an outer hub 1 , an inner hub 2 , a plurality of inner blades 3 and a plurality of outer blades 4 .

Specifically, referring to Fig. 1, the inner hub 2 is arranged in the outer hub 1, a plurality of inner blades 3 are connected between the outer peripheral wall of the inner hub 2 and the inner peripheral wall of the outer hub 1, and a plurality of outer blades 4 are connected to the outer periphery of the outer hub 1 On the wall, here, it should be noted that "inner" can be understood as a direction toward the central axis of the inner hub 2, and the opposite direction is defined as "outer", that is, a direction away from the central axis of the inner hub 2.

Referring to Figures 1-3, the inner hub 2 can be generally formed into a cylindrical shape, the outer hub 1 can be generally formed into a circular cylinder, and the outer hub 1 is coaxially sleeved outside the inner hub 2, that is to say, the inner hub 2 Coaxially arranged in the outer hub 1, each inner blade 3 extends outward from the outer peripheral wall of the inner hub 2 to the inner peripheral wall of the outer hub 1, and the inner edge 3a of each inner blade 3 is aligned with the outer circumference of the inner hub 2 The wall is fixedly connected, the outer edge 3b of each inner blade 3 is fixedly connected with the inner peripheral wall of the outer hub 1, each outer blade 4 extends outward from the outer peripheral wall of the outer hub 1, and the inner edge of each outer blade 4 4a are all fixedly connected with the outer peripheral wall of the outer hub 1 .

As shown in FIG. 3 , a plurality of inner blades 3 are arranged at intervals in the circumferential direction of the inner hub 2 , and a plurality of outer blades 4 are arranged at intervals in the circumferential direction of the outer hub 1 . That is to say, any adjacent two inner blades 3 are spaced apart from each other in the circumferential direction of the inner hub 2 , and any adjacent two outer blades 4 are spaced apart from each other in the circumferential direction of the outer hub 1 . Preferably, the plurality of inner blades 3 are evenly spaced in the circumferential direction of the inner hub 2 , and the plurality of outer blades 4 are evenly spaced in the circumferential direction of the outer hub 1 . That is to say, any adjacent two inner blades 3 are equally spaced apart in the circumferential direction of the inner hub 2 , and any adjacent two outer blades 4 are equally spaced apart in the circumferential direction of the outer hub 1 .

Preferably, the inner hub 2, the outer hub 1, a plurality of inner blades 3, and a plurality of outer blades 4 are integrally formed, for example, an injection molding process can be used for integral injection molding, thereby improving the strength of the fan blade 100, thereby ensuring that the fan blade 100 There are no moving parts, which ensures the reliable performance of the fan blade 100 as a whole and facilitates processing. In this way, since the fan blade 100 includes the inner blade 3 and the outer blade 4 arranged inside and outside, it can ensure the concentration of wind force, avoid the problem that the wind sent by the inner blade 3 diverges prematurely and cannot send air over a long distance, and then lengthens the air delivery distance.

Specifically, the structures of the plurality of outer blades 4 are the same, that is, the overall structure of each outer blade 4 is the same, so that a plurality of outer blades 4 can be obtained by duplicating one outer blade 4, wherein each outer blade 4 The cross-sectional shape of the outer blade 4 is formed as an airfoil, that is to say, each outer blade 4 is an airfoil blade, that is, in the radial direction of the outer hub 1 (that is, the inner hub 2), the cross-sectional shape of each outer blade 4 is formed as an airfoil. type. Here, it should be noted that, in the radial direction of the outer hub 1, the airfoil formed by the cross-sectional shape of each outer blade 4 may be different, for example, the airfoil formed by the cross-section of the outer edge 4b of each outer blade 4 may be different from the airfoil formed by the cross-section of the inner edge 4a. The airfoils formed are different, of course, the airfoils formed by the cross-sectional shape of each outer blade 4 in the radial direction of the outer hub 1 can also be the same everywhere. Here, it can be understood that the concept of "airfoil" is well known to those skilled in the art, and will not be described in detail here.

Therefore, since the airfoil blades have good aerodynamic performance, each outer blade 4 has good aerodynamic performance, thereby improving the overall aerodynamic performance of the fan blade 100, reducing power consumption, and saving energy (such as electric energy). And because the plurality of outer blades 4 are airfoil blades with the same structure, the overall aerodynamic performance of the plurality of outer blades 4 can be further improved, power consumption is further reduced, and energy (such as electric energy) is saved.

According to the fan blade 100 of the embodiment of the present utility model, by arranging a plurality of inner blades 3 and a plurality of outer blades 4, the concentration of wind force can be ensured, and the problem that the wind sent by the inner blades 3 can be diverged prematurely and unable to send air over a long distance can be avoided. Then the air supply distance is lengthened, and since the plurality of outer blades 4 are airfoil blades with the same structure, the aerodynamic performance of a single outer blade 4 and the overall aerodynamic performance of a plurality of outer blades 4 can be improved, thereby improving the performance of the fan blade 100. The aerodynamic performance reduces the power consumption of the fan blade 100 and saves energy. In addition, since the structures of the plurality of outer blades 4 are the same, processing is facilitated.

In one embodiment of the present utility model, with reference to Fig. 1, the structures of a plurality of inner blades 3 are all the same, that is to say, the overall structure of each inner blade 3 is all the same, so that a plurality of inner blades 3 can pass through one inner blade 3, wherein the cross-sectional shape of each inner blade 3 is formed as an airfoil, that is, each inner blade 3 is an airfoil blade, that is, in the radial direction of the inner hub 2, the cross-section of each inner blade 3 The shapes are all formed as airfoils. Thus, the aerodynamic performance of a single inner blade 3 and the overall aerodynamic performance of multiple inner blades 3 can be improved, thereby improving the aerodynamic performance of the fan blade 100 , reducing the power consumption of the fan blade 100 , and saving energy. In addition, since the multiple inner blades 3 have the same structure, processing is facilitated.

Here, it should be noted that, in the radial direction of the inner hub 2, the airfoil formed by the cross-sectional shape of each inner blade 3 may be different. The airfoils formed by the cross sections are different, of course, the airfoils formed by the cross-sectional shape of each inner blade 3 in the radial direction of the inner hub 2 can also be the same everywhere.

Optionally, the cross-sectional shape of each inner blade 3 can be formed as a Goe118 airfoil, Goe115 airfoil, Goe123 airfoil, NACA0006 airfoil or NACA6409 airfoil, and the cross-sectional shape of each outer blade 4 can also be formed as a Goe118 airfoil , Goe115 airfoil, Goe123 airfoil, NACA0006 airfoil or NACA6409 airfoil. Thus, the aerodynamic performance of the inner blade 3 and the outer blade 4 is improved.

That is to say, on the radial direction of inner hub 2, when the airfoil formed by the cross-sectional shape of each outer blade 4 is the same everywhere, the airfoil formed by the cross-sectional shape of each outer blade 4 can be Goe118 airfoil, Goe115 airfoil , Goe123 airfoil, NACA0006 airfoil and NACA6409 airfoil, and in the radial direction of the inner hub 2, when the airfoil formed by the cross-sectional shape of each outer blade 4 is different, the cross-sectional shape of each outer blade 4 The formed airfoil may also include one or more of Goe118 airfoil, Goe115 airfoil, Goe123 airfoil, NACA0006 airfoil and NACA6409 airfoil.

That is to say, in the radial direction of the inner hub 2, when the airfoil formed by the cross-sectional shape of each inner blade 3 is the same everywhere, the airfoil formed by the cross-sectional shape of each inner blade 3 can be Goe118 airfoil, Goe115 airfoil , Goe123 airfoil, NACA0006 airfoil and NACA6409 airfoil, and in the radial direction of the inner hub 2, when the airfoil formed by the cross-sectional shape of each inner blade 3 is different, the cross-sectional shape of each inner blade 3 The formed airfoil may also include one or more of Goe118 airfoil, Goe115 airfoil, Goe123 airfoil, NACA0006 airfoil and NACA6409 airfoil.

Of course, the present invention is not limited thereto, and the cross-sectional shape of each inner blade 3 and each outer blade 4 can be designed according to actual requirements, for example, can be formed into other airfoils to better meet actual requirements.

Here, it should be noted that, in the radial direction of the inner hub 2, the airfoil formed by the cross-sectional shape of each inner blade 3 is the same everywhere, and the airfoil formed by the cross-sectional shape of each outer blade 4 is also the same everywhere, the outer The cross-sectional shape of the blade 4 and the cross-sectional shape of the inner blade 3 may be the same or different.

In one embodiment of the present utility model, as shown in Figure 3, each inner blade 3 and each outer blade 4 are all formed as curved twisted blades, and the inlet angle β2 of the outer edge 3b of each inner blade 3 is equal to Smaller than the inlet angle β1 of the inner edge 3a, that is, the inlet angle β1 of the inner edge 3a and the inlet angle β2 of the outer edge 3b of each inner blade 3 satisfy the relationship: The airflow friction loss caused by the excessive difference of airflow parameters from the edge 3a to the outer edge 3b improves the gas flow efficiency.

As shown in Figure 3 and Figure 5, the inlet angle α2 of the outer edge 4b of each outer blade 4 is smaller than the inlet angle α1 of the inner edge 4a, that is, the inlet angle α1 of the outer edge 4b of each outer blade 4 and the inner The intake angle α2 of the edge 4a satisfies the relationship: α1<α2. As a result, the frictional loss of the airflow caused by the large difference in airflow parameters from the inner edge 4a to the outer edge 4b of the outer blade 4 can be reduced, thereby further improving the gas flow efficiency.

Here, it should be noted that, as shown in FIG. 5, when the fan blade 100 rotates in the direction indicated by the arrow R shown in FIG. The α1 angle) refers to the angle between the velocity v direction of the airflow inlet E1 and the tangent line of the arc Lm of the blade section, where the "airflow inlet E1" is the initial position of the airflow entering the blade, and correspondingly, the "airflow outlet E2" ( For example, the γ angle shown in Figure 5) is the end position of the airflow leaving the blade, and the "middle arc Lm" is the line connecting the geometric midpoints on both sides of the blade section, which characterizes the characteristics of the blade section airfoil.

Referring to Fig. 5, the solid line in the figure is the outer edge 4b section airfoil of the outer blade 4 according to the embodiment of the present utility model, and the dotted line is the inner edge 4a section airfoil of the outer blade 4 according to the utility model embodiment, from the figure It can be seen that the inlet angle α2 of the airfoil of the inner edge 4a section is greater than the inlet angle α1 of the airfoil of the outer edge 4b section, thus, it can be clearly concluded that the outer blade 4 is a twisted blade. Preferably, for an outer blade 4, the inlet angle α1 of the outer edge 4b and the inlet angle α2 of the inner edge 4a satisfy the relationship, α1+5°≤α2≤α1+10°, wherein the outer edge 4b of the outer blade 4 The intake angle α1 satisfies: 10°≤α1≤15°.

Preferably, along the radial direction of the inner hub 2 from the inside to the outside, the air intake angle of each outer blade 4 gradually decreases, and along the radial direction of the inner hub 2 from the inside to the outside, the air intake angle of each outer blade 4 The angle gradually decreases, and the minimum inlet angle of the inner blade 3 is greater than the maximum inlet angle of the outer blade 4, namely: α1<α2<β1<β2. Therefore, since the inner blade 3 adopts a larger air intake angle than the outer blade 4 , the intensity of the central airflow can be further improved, and the overall aerodynamic performance of the fan blade 100 can be further ensured. In short, the fan blade 100 adopts a curved and twisted blade whose outer edge inlet angle is smaller than the inner edge inlet angle, which can improve the aerodynamic performance of the blade, reduce flow loss, and reduce energy consumption.

In one embodiment of the present utility model, referring to Fig. 4, the axial width of the outer blade 4 is equal to the axial width of the inner blade 3, and is equal to the axial width of the inner hub 2 and the axial width of the inner hub 2 respectively , so as to facilitate processing and assembly, and can ensure the air supply effect.

In one embodiment of the present utility model, with reference to Fig. 2 and Fig. 3, the projection of the line L1 of the intersection of the inner edge 3a and the leading edge 3c of each inner blade 3 and the intersection of the outer edge 3b and the leading edge 3c in the reference plane Be a straight line, the projection of the line L2 of the intersection of the inner edge 3a of each inner blade 3, the intersection of the trailing edge 3d and the intersection of the outer edge 3b and the intersection of the trailing edge 3d in the reference plane is a straight line, the outer edge 4b of each outer blade 4, the front The projection of the line L3 of the intersection of the edge 4c and the intersection of the inner edge 4a and the leading edge 4c in the reference plane is a curve. The projection of the line L4 in the reference plane is a curve. Wherein, the reference plane is a plane perpendicular to the rotation axis of the fan blade 100 , that is, a plane perpendicular to the central axis of the inner hub 2 . Thus, the overall energy efficiency of the fan blade 100 can be further improved.

Preferably, the installation angle of each inner blade 3 is the same, and the installation angle of each outer blade 4 is also the same, so that a plurality of inner blades 3 with the same structure can be obtained by an annular array of inner blades 3, and a plurality of outer blades with the same structure 4 can be obtained by an annular array of outer vanes 4 . Here, when necessary, it should be noted that the "installation angle" is well known to those skilled in the art, and will not be described in detail here.

In one embodiment of the present utility model, the outer diameter D2 of the outer hub 1 and the diameter D1 of the fan blade 100 satisfy the relationship: D2≤0.5D1, that is to say, the outer diameter D2 of the outer hub 1 and the outer edge of the outer blade 4 The diameter D1 of 4b satisfies the relationship: D2≤0.5D1, preferably, 180mm≤D1≤400mm. Thus, the size of the inner blade 3 can be ensured to be larger, and the blade 100 can be more concentrated and more stable to realize long-distance air supply. Here, it should be noted that, according to the specific application requirements of the fan blade 100, the outer diameter D2 of the outer hub 1 and the diameter D1 of the outer edge 4b of the outer blade 4 can be simultaneously enlarged or reduced according to a certain ratio, so as to ensure the performance of the fan blade 100. Under the premise of meeting the practical application requirements.

A fan blade 100 according to an embodiment of the present invention will be described below with reference to FIGS. 1-5 .

Specifically, there are five inner blades 3, and the five inner blades 3 are evenly spaced on the outer peripheral wall of the inner hub 2, and there are seven outer blades 4, and the seven outer blades 4 are evenly spaced on the outer peripheral wall of the outer hub 1 distribution, the five inner blades 3 have the same structure and the same installation angle, the seven outer blades 4 have the same structure and the same installation angle, the axial width l of each inner blade 3 is 40mm, and each outer blade 4 The axial width L is 40mm.

The diameter _d2 of the inner edge 3a of each inner blade 3 is 50mm, that is, the outer diameter of the inner hub 2 is 50mm, and the diameter _d1 of the outer edge 3b of each inner blade 3 is 122mm, that is, the inner diameter of the outer hub 1 is 122mm , the thickness h of the outer hub 1 is 3 mm, that is, the outer peripheral diameter of the outer hub 1 is 125 mm, so that the diameter D of the inner edge 4 a of each outer blade 4 is 128 mm, and the diameter D of the outer edge ₄ b of each outer blade ₄ is 230 mm . Optionally, a motor output shaft mounting hole 21 may be formed on the inner hub 2, and the diameter of the mounting hole 21 may be 8 mm.

In this way, during the working process of the fan blade 100, for example, in the example of FIG. 2, the fan blade 100 rotates clockwise as shown by the arrow in the figure, which can push the air to move in the direction of the outlet, so that the outer blade 4 is outputted forward. The wind of the inner blade 3 is relatively large, and the wind output by the inner blade 3 is relatively small. In this way, an airflow is formed on the inner and outer sides of the outer hub 1 respectively. In this way, the inner and outer airflows rub against each other at the intersection, and the centrifugal diffusion effect is eliminated. It is greatly reduced, so that the wind blown by the fan blade 100 is relatively concentrated and does not diverge, so that the wind can be sent to a far location. In the fan blade 100 with only one layer of blades in the related art, due to the effect of centrifugal force, the wind sent out is quickly thrown around, and the central airflow is weak, so that the wind cannot be felt at a slightly longer distance, that is to say , the air supply distance is short. In addition, the existence of the inner airflow also eliminates the vortex problem of the outlet airflow, thereby improving the flow efficiency, so that the fan blade 100 can steadily push the airflow to a long distance ahead.

Furthermore, since the fan blade 100 adopts an airfoil blade, compared with common blades of equal thickness, such as flat blades, the performance is excellent, the flow loss is reduced, and the flow efficiency is improved. Moreover, since the outer blades 4 and the inner blades 3 all adopt the curved and twisted blade structure with the inlet angle of the inner edge greater than the inlet angle of the outer edge, it conforms to the flow law of the airflow and reduces the flow loss of the airflow on the blades. In addition, because the inner blades 3 Adopting a larger air intake angle than the outer blade 4 can further increase the intensity of the central airflow, especially at high speeds, the fan blade 100 has better aerodynamic performance and saves a lot of electric energy.

By limiting the number of inner blades 3 and outer blades 4, it is possible to ensure that the fan blade 100 has a higher rotating speed, so that the advantages of the fan blade 100 with airfoil blades are more obvious, thereby significantly reducing the flow loss of the airflow and reducing energy consumption. consumption.

The fan (not shown) according to the embodiment of the second aspect of the utility model includes the fan blade 100 according to the embodiment of the first aspect of the utility model. Optionally, the fan may be a desk fan, a vortex fan, or a platform fan.

Other configurations of the fan according to the embodiment of the present invention, such as the housing assembly and the control assembly, as well as operations are known to those skilled in the art, and will not be described in detail here.

According to the fan of the embodiment of the utility model, the overall performance of the fan is improved by providing the fan blade 100 of the embodiment of the first aspect.

In describing the present invention, it should be understood that the terms "central", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, use a specific The azimuth structure and operation, therefore can not be construed as the limitation of the present utility model.

In this utility model, unless otherwise specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrated; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two elements or the interaction relationship between two elements. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structures, materials or features are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and modifications, the scope of the present invention is defined by the claims and their equivalents.

Claims (10)

1. A wind blade, characterized in that, comprising: outer hub; an inner hub disposed within the outer hub; a plurality of inner blades connected between the outer peripheral wall of the inner hub and the inner peripheral wall of the outer hub and spaced apart in the circumferential direction of the inner hub; and A plurality of outer blades with the same structure, the plurality of outer blades are connected to the outer peripheral wall of the outer hub and arranged at intervals in the circumferential direction of the outer hub, wherein the cross section of each outer blade is formed as an airfoil . 2 . The fan blade according to claim 1 , wherein the structures of the plurality of inner blades are the same, and the cross-sectional shape of each of the inner blades is formed as an airfoil. 3 . 3. The wind blade according to claim 2, characterized in that, the cross-sectional shape of each said inner blade and/or the cross-sectional shape of each said outer blade is formed as a Goe118 airfoil, a Goe115 airfoil, a Goe123 airfoil , NACA0006 airfoil or NACA6409 airfoil. 4. The fan blade according to claim 1, characterized in that, each of the inner blades and each of the outer blades is formed as a curved blade, and each of the inner blades has an outer edge inlet angle β1 and The inner edge inlet angle β2 satisfies the relationship: β1<β2, and the outer edge inlet angle α1 and the inner edge inlet angle α2 of each outer blade satisfy the relationship: α1<α2. 5. The fan blade according to claim 4, wherein the α1 satisfies: 10°≤a1≤15°, and the α1 and the α2 further satisfy: α1+5°≤α2≤α1+10° . 6. The wind blade according to claim 4, characterized in that, along the radial direction of the inner hub from the inside to the outside, the intake angle of each of the inner blades gradually decreases, and along the inner hub From the inside to the outside of the radial direction, the inlet angle of each of the outer blades gradually decreases, and the minimum inlet angle of the inner blades is greater than the maximum inlet angle of the outer blades. 7. The fan blade according to claim 1, wherein the axial width of the outer blade is equal to the axial width of the inner blade. 8. The fan blade according to claim 1, characterized in that, the line connecting the leading edge point of the outer edge and the leading edge point of the inner edge of each inner blade is on a reference plane perpendicular to the rotation axis of the fan blade The projection inside is a straight line, and the projection of the line connecting the trailing edge point of the outer edge and the trailing edge point of the inner edge of each of the inner blades in the reference plane is a straight line, The projection of the line connecting the leading edge point of the outer edge and the leading edge point of the inner edge of each of the outer blades in the reference plane is a curve, and the trailing edge point of the outer edge of each of the outer blades and the trailing edge point of the inner edge The projection of the connecting line in the reference plane is a curve. 9 . The fan blade according to claim 1 , wherein the outer diameter D2 of the outer hub and the diameter D1 of the fan blade satisfy a relationship: D2 ≤ 0.5D1. 10. A fan, characterized by comprising the fan blade according to any one of claims 1-9.