CN217176973U - Quiet leaf, impeller subassembly and fan - Google Patents

Abstract

The utility model relates to a fan technical field provides a quiet leaf, impeller subassembly and fan, and this quiet leaf includes wheel hub and a plurality of blade, and is a plurality of the blade is followed wheel hub's even and interval of circumference sets up, the blade has relative first face and second face, the one end of blade with wheel hub's outer peripheral face fixed connection, the other end past keep away from wheel hub's direction is extended and is past earlier near the direction of first face is crooked again past being close to the direction of second face is crooked. The stationary blade can improve the efficiency of the fan and reduce the noise of the fan.

Description

Quiet leaf, impeller subassembly and fan

Technical Field

The application relates to the technical field of fans, in particular to a stationary blade, an impeller assembly and a fan.

Background

With the development of current science and technology, various fans are in endless, and fans are also applied to various fields, such as gas conveying, negative pressure suction, heat dissipation of electronic products and the like. In the use process of the fan, the noise reduction performance and the energy efficiency of the fan are always considered.

In the traditional fan classification, the pressure of the fan with the static blades is improved by 15% compared with the fan without the static blades, and particularly, the fan with the static blades is most widely applied in products with larger resistance, but the efficiency and the noise of the traditional fan with the static blades cannot be satisfied.

SUMMERY OF THE UTILITY MODEL

In view of this, the present application provides a stationary blade, an impeller assembly and a fan, so as to improve efficiency of the fan and reduce noise thereof.

An embodiment of the first aspect of the present application provides a stationary blade, including hub and a plurality of blade, it is a plurality of the blade is followed the even and interval setting in hub's circumference, the blade has relative first face and second face, the one end of blade with hub's outer peripheral face fixed connection, the other end toward keeping away from hub's direction extension and first toward being close to the direction bending of first face is then toward being close to the direction bending of second face:

the blade is provided with a first section, a second section, a third section, a fourth section and a fifth section in sequence from a blade root to a blade top, the first section, the second section, the third section, the fourth section and the fifth section are uniformly and alternately arranged along the radial direction of the hub, and the blade is continuously and uniformly deformed from the first section to the fifth section;

a plane perpendicular to the axis of the hub is taken as a first projection plane, the projection of the axis of the hub on the first projection plane is taken as a first reference point, the projection of the intersection line of the first surface and the outer peripheral surface of the hub on the first projection plane is taken as a second reference point, and the connecting line of the first reference point and the second reference point is taken as a first reference line;

the projection of the intersection line of the first cross section and the first surface on the first projection plane is a first intersection point, the connecting line of the first intersection point and the first reference point is a first intersection line, and the included angle between the first intersection line and the first reference line is a first sweeping angle;

the projection of the intersection line of the second cross section and the first surface on the first projection plane is a second intersection point, the connecting line of the second intersection point and the first reference point is a second intersection line, the included angle between the second intersection line and the first reference line is a second sweep angle, and the second sweep angle is larger than the first sweep angle;

a projection of an intersection line of the third cross section and the first surface on the first projection plane is a third intersection point, a connecting line of the third intersection point and the first reference point is a third intersection line, an included angle between the third intersection line and the first reference line is a third sweep angle, and the third sweep angle is larger than the second sweep angle;

a projection of an intersection line of the fourth cross section and the first surface on the first projection plane is a fourth intersection point, a connecting line of the fourth intersection point and the first reference point is a fourth intersection line, an included angle between the fourth intersection line and the first reference line is a fourth sweep angle, and the fourth sweep angle is larger than the third sweep angle;

a projection of an intersection line of the fifth cross section and the first surface on the first projection plane is a fifth intersection point, a connecting line of the fifth intersection point and the first reference point is a fifth intersection line, an included angle between the fifth intersection line and the first reference line is a fifth sweep angle, and the fifth sweep angle is smaller than the fourth sweep angle;

taking a plane perpendicular to the first projection plane as a second projection plane, taking a projection of the first projection plane on the second projection plane as a second reference line, and respectively having a first chord, a second chord, a third chord, a fourth chord and a fifth chord in the projections of the first cross section, the second cross section, the third cross section, the fourth cross section and the fifth cross section on the second projection plane;

an acute angle formed by the first string and the second reference line is a first installation angle, an acute angle formed by the second string and the second reference line is a second installation angle, an acute angle formed by the third string and the second reference line is a third installation angle, an acute angle formed by the fourth string and the second reference line is a fourth installation angle, an acute angle formed by the fifth string and the second reference line is a fifth installation angle, the first installation angle is larger than the second installation angle, the second installation angle is larger than the third installation angle, the third installation angle is equal to the fourth installation angle, and the fourth installation angle is smaller than the fifth installation angle.

In some embodiments, five circumferential surfaces coaxial with the hub are respectively a first tangential surface, a second tangential surface, a third tangential surface, a fourth tangential surface and a fifth tangential surface, the first tangential surface, the second tangential surface, the third tangential surface, the fourth tangential surface and the fifth tangential surface are uniformly and alternately arranged along the radial direction of the hub, the first tangential surface, the second tangential surface, the third tangential surface, the fourth tangential surface and the fifth tangential surface are all intersected with the blade, and the intersected surfaces of the second tangential surface, the third tangential surface, the fourth tangential surface and the fifth tangential surface and the blade are respectively the first tangential surface, the second tangential surface, the third tangential surface, the fourth tangential surface and the fifth tangential surface.

In some of these embodiments, the first sweep angle is in the range of 15 ° to 20 °, the second sweep angle is in the range of 25 ° to 30 °, the third sweep angle is in the range of 35 ° to 40 °, the fourth sweep angle is in the range of 40 ° to 45 °, and the fifth sweep angle is in the range of 35 ° to 40 °.

In some of these embodiments, the first sweep angle is 20 °, the second sweep angle is 25 °, the third sweep angle is 40 °, the fourth sweep angle is 40 °, and the fifth sweep angle is 35 °.

In some of these embodiments, the first setting angle ranges from 72 ° to 75 °, the second setting angle ranges from 69 ° to 72 °, the third setting angle ranges from 63 ° to 65 °, the fourth setting angle ranges from 63 ° to 65 °, and the fifth setting angle ranges from 66 ° to 69 °.

In some of these embodiments, the first mount angle is 72 °, the second mount angle is 69 °, the third mount angle is 65 °, the fourth mount angle is 65 °, and the fifth mount angle is 69 °.

In some of these embodiments, the maximum thickness of the blade at the first, second, third, fourth and fifth cross-sections is T1, T1, T2, T3, T4 and T5, respectively, T1> T2> T3-T4 < T5.

In some of these embodiments, the blades have a thickness in the range of 2.3mm to 2.8 mm.

Embodiments of the second aspect of the present application provide an impeller assembly comprising:

the mounting seat is provided with a mounting hole;

a vane according to the first aspect, the vane being fixedly disposed within the mounting hole; and

the movable blade is rotatably arranged in the mounting hole and is coaxially arranged with the static blade.

Embodiments of a third aspect of the present application provide a wind turbine comprising a power plant and an impeller assembly as described in the second aspect, the power plant being in rotational connection with the blades in the impeller assembly.

The stator blade provided by the embodiment of the application has the beneficial effects that: the second sweep angle is larger than the first sweep angle, the third sweep angle is larger than the second sweep angle, the fourth sweep angle is larger than the third sweep angle, the fifth sweep angle is smaller than the fourth sweep angle, the first mounting angle is larger than the second mounting angle, the second mounting angle is larger than the third mounting angle, the third mounting angle is equal to the fourth mounting angle, and the fourth mounting angle is smaller than the fifth mounting angle, so that the airflow impact loss near the rim of the stationary blade can be weakened, the flow field distribution of the stationary blade is improved, the performance of the impeller is improved, the efficiency is improved, and the noise is reduced.

The utility model provides an impeller subassembly, through setting up that the second sweep angle is greater than first sweep angle, the third sweep angle is greater than the second sweep angle, the fourth sweep angle is greater than the third sweep angle, the fifth sweep angle is less than the fourth sweep angle, and first erection angle is greater than the second erection angle, the second erection angle is greater than the third erection angle, the third erection angle equals the fourth erection angle, the fourth erection angle is less than the fifth erection angle, the near air current impact loss of the rim of quiet leaf has been weakened, the flow field distribution of quiet leaf has been improved, thereby the performance of impeller subassembly has been promoted, and the efficiency is improved, and the noise is reduced.

The fan that this application embodiment provided, efficiency is higher in the use, and the noise is less.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a schematic structural view of an impeller assembly according to one embodiment of the present application;

FIG. 2 is a schematic structural view from another perspective of the impeller assembly shown in FIG. 1;

FIG. 3 is a structural schematic view of the vane shown in FIG. 1;

FIG. 4 is a front view of the vane shown in FIG. 3;

FIG. 5 is a bottom view of the vane shown in FIG. 3;

FIG. 6 is a graph comparing noise energy efficiency of the fan shown in FIG. 1 with a conventional fan;

FIG. 7 is a pressure distribution simulation diagram of the vane shown in FIG. 1;

fig. 8 is a graph showing a comparison of noise energy efficiency when the installation angle of the blower shown in fig. 1 is in the upper and lower limits.

The designations in the figures mean:

10. an impeller assembly; 11. a mounting seat; 111. mounting holes; 12. a stationary blade; 121. a hub; 122. a blade; 1221. a first side; 1222. a second face; 123. a fifth chord; 13. moving blades; 20. a first section; 30. A second section; 40. a third section; 50. a fourth section; 60. a fifth section; 70. a first reference line; 80. a second reference line.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail below with reference to the accompanying drawings, which are examples. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In order to explain the technical solution of the present application, the following description is made with reference to the specific drawings and examples.

Referring to fig. 1 and 2, an embodiment of the present application provides a wind turbine, which includes a power device (not shown) and an impeller assembly 10, where the impeller assembly 10 includes a mounting seat 11, a stationary vane 12 and a movable vane 13, and the power device is rotatably connected to the movable vane 13 in the impeller assembly 10.

It will be appreciated that the power means may comprise a motor and necessary transmission components for rotating the blades 13 of the impeller assembly 10.

The mount 11 is provided with a mounting hole 111 for accommodating the vane 12 and the blade 13.

The stator blade 12 is fixedly provided in the mounting hole 111, the rotor blade 13 is rotatably provided in the mounting hole 111, and the rotor blade 13 is provided coaxially with the stator blade 12.

Referring to fig. 3 and 4, the vane 12 includes a hub 121 and a plurality of blades 122, the plurality of blades 122 are uniformly and intermittently disposed along a circumferential direction of the hub 121, the blades 122 have a first surface 1221 and a second surface 1222 opposite to each other, one end of each blade 122 is fixedly connected to an outer circumferential surface of the hub 121, and the other end of each blade 122 extends away from the hub 121 and is bent in a direction approaching the first surface 1221 and then the second surface 1222, so as to form a substantially "S" shaped profile.

The blade 122 is provided with a first section, a second section, a third section, a fourth section and a fifth section in sequence from the blade root to the blade tip, the first section, the second section, the third section, the fourth section and the fifth section are uniformly and alternately arranged along the radial direction of the hub 121, and the blade 122 is continuously and uniformly deformed from the first section to the fifth section to determine the shape of the blade 122.

In this embodiment, the positions and shapes of the first cross section, the second cross section, the third cross section, the fourth cross section, and the fifth cross section may be determined as follows: five circumferential surfaces coaxial with the hub 121 are respectively a first tangent surface 20, a second tangent surface 30, a third tangent surface 40, a fourth tangent surface 50 and a fifth tangent surface 60, the first tangent surface 20, the second tangent surface 30, the third tangent surface 40, the fourth tangent surface 50 and the fifth tangent surface 60 are uniformly and alternately arranged along the radial direction of the hub 121, the first tangent surface 20, the second tangent surface 30, the third tangent surface 40, the fourth tangent surface 50 and the fifth tangent surface 60 are intersected with the blade 122, and the intersected surfaces of the second tangent surface 30, the third tangent surface 40, the fourth tangent surface 50 and the fifth tangent surface 60 and the blade 122 are respectively a first section, a second section, a third section, a fourth section and a fifth section.

A plane perpendicular to the axis of the hub 121 is taken as a first projection plane, a projection of the axis of the hub 121 on the first projection plane is taken as a first reference point, a projection of an intersection line of the first surface 1221 and the outer peripheral surface of the hub 121 on the first projection plane is taken as a second reference point, and a connecting line of the first reference point and the second reference point is taken as a first reference line 70.

A projection of an intersection line of the first cross section and the first surface 1221 on the first projection plane is a first intersection point, a connection line of the first intersection point and the first reference point is a first intersection line, and an included angle between the first intersection line and the first reference line 70 is a first sweep angle C1.

The projection of the intersection line of the second cross section and the first surface 1221 on the first projection plane is a second intersection point, the connecting line of the second intersection point and the first reference point is a second intersection line, the included angle between the second intersection line and the first reference line 70 is a second sweep angle C2, and the second sweep angle C2 is greater than the first sweep angle C1.

The projection of the intersection line of the third cross section and the first surface 1221 on the first projection plane is a third intersection point, the connecting line of the third intersection point and the first reference point is a third intersection line, the included angle between the third intersection line and the first reference line 70 is a third sweep angle C3, and the third sweep angle C3 is greater than the second sweep angle C2.

The projection of the intersection line of the fourth cross section and the first surface 1221 on the first projection plane is a fourth intersection point, the connecting line of the fourth intersection point and the first reference point is a fourth intersection line, the included angle between the fourth intersection line and the first reference line 70 is a fourth sweep angle C4, and the fourth sweep angle C4 is greater than the third sweep angle C3.

The projection of the intersection line of the fifth cross section and the first surface 1221 on the first projection plane is a fifth intersection point, the connecting line of the fifth intersection point and the first reference point is a fifth intersection line, the included angle between the fifth intersection line and the first reference line 70 is a fifth sweep angle C5, and the fifth sweep angle C5 is smaller than the fourth sweep angle C4.

Referring to fig. 5, a plane perpendicular to the first projection plane is taken as a second projection plane, a projection of the first projection plane on the second projection plane is taken as a second reference line 80, and projections of the first cross section, the second cross section, the third cross section, the fourth cross section and the fifth cross section on the second projection plane respectively have a first chord, a second chord, a third chord, a fourth chord and a fifth chord 123.

It is understood that the first chord is the chord with the largest projection length of the first cross section on the second projection plane, the second chord is the chord with the largest projection length of the second cross section on the second projection plane, the third chord is the chord with the largest projection length of the third cross section on the second projection plane, the fourth chord is the chord with the largest projection length of the fourth cross section on the second projection plane, and the fifth chord 123 is the chord with the largest projection length of the fifth cross section on the second projection plane.

As shown in the drawing, the acute angle formed by the fifth chord 123 and the second reference line 80 is a fifth installation angle B5, the first installation angle is greater than the second installation angle, the second installation angle is greater than the third installation angle, the third installation angle is equal to the fourth installation angle, and the fourth installation angle is less than the fifth installation angle B5.

The traditional stator blade has a severe working environment and is interfered by a wake from a front movable blade, and if the design is not good, the performance is not improved, but larger noise is caused; because of the non-uniformity of tangential velocity (especially for a fan with a small hub ratio), the flow field state of the hub and the edge (rim) of the stator blade is greatly different, if the stator blade designed by ideal full pressure conservation is usually deviated from the actual working point, the performance of the stator blade is deteriorated, vortex and turbulent flow are continuously generated, and the overall performance of the fan is reduced.

According to the stator blade 12 provided by the embodiment of the application, the second sweep angle C2 is greater than the first sweep angle C1, the third sweep angle C3 is greater than the second sweep angle C2, the fourth sweep angle C4 is greater than the third sweep angle C3, the fifth sweep angle C5 is smaller than the fourth sweep angle C4, the first mounting angle is greater than the second mounting angle, the second mounting angle is greater than the third mounting angle, the third mounting angle is equal to the fourth mounting angle, and the fourth mounting angle is smaller than the fifth mounting angle B5, so that the airflow impact loss near the rim of the stator blade 12 can be weakened, the flow field distribution of the stator blade 12 is improved, the impact of the wake flow of the rotor blade 13 on the stator blade 12 is reduced, the flow field of the fan is smoother, the fan efficiency is improved by 3%, and the noise is reduced by 2 dBA.

Referring to fig. 6, it can be seen that, compared with the conventional fan, the fan provided in the embodiment of the present application has improved efficiency and reduced noise.

Referring to fig. 7, while the conventional vane has uneven distribution of pressure on the suction surface of the vane in the radial direction (from the hub 121 to the rim) due to the gap vortex near the rim, the vane 12 provided in the embodiment of the present application has improved uneven distribution of pressure on the suction surface in the radial direction (from the hub 121 to the rim) by adjusting the geometrical angle of the cross section, so as to weaken the transverse secondary flow, especially the secondary flow between the fourth cross section and the fifth cross section, and the vane 12 provided in the embodiment of the present application has a larger flow rate than the conventional vane at the same back pressure and higher efficiency of the fan provided in the embodiment of the present application under the same power consumption at the same rotation speed.

In some embodiments, the first sweep angle C1 ranges from 15 to 20, the second sweep angle C2 ranges from 25 to 30, the third sweep angle C3 ranges from 35 to 40, the fourth sweep angle C4 ranges from 40 to 45, and the fifth sweep angle C5 ranges from 35 to 40; the first mounting angle ranges from 72 ° to 75 °, the second mounting angle ranges from 69 ° to 72 °, the third mounting angle ranges from 63 ° to 65 °, the fourth mounting angle ranges from 63 ° to 65 °, and the fifth mounting angle B5 ranges from 66 ° to 69 °. So can make the fan obtain better efficiency, and the noise is lower.

In this embodiment, the first sweep angle C1 is 20 °, the second sweep angle C2 is 25 °, the third sweep angle C3 is 40 °, the fourth sweep angle C4 is 40 °, and the fifth sweep angle C5 is 35 °; the first mount angle is 72 °, the second mount angle is 69 °, the third mount angle is 65 °, the fourth mount angle is 65 °, and the fifth mount angle B5 is 69 °. This allows for optimum fan efficiency with minimal noise.

Since the thickness of the vane 12 is related to the chord of the maximum projection length of each section on the blade 122 on the second projection plane and the installation angle, the maximum thickness of the blade 122 on the first section, the second section, the third section, the fourth section and the fifth section is T1, T1, T2, T3, T4 and T5, respectively, T1> T2> T3-T4 < T5.

Referring to fig. 8, it can be seen from the figure that when the angle of each installation angle of the fan provided in the embodiment of the present application is limited, the flow rate of the fan is increased, the pressure is reduced, the noise is increased, the overall energy efficiency of the fan tends to be poor, and the angle collocation of other installation angles is changed between the two angles.

In the present embodiment, the thickness of the blade 122 ranges from 2.3mm to 2.8mm, such as 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, or 2.8mm, so that the stationary blade 12 has better performance.

The present application provides an impeller assembly 10 including a stator vane 12 according to any of the above embodiments, and the impeller assembly 10 of the present application reduces the airflow impact loss near the rim of the stator vane 12 and improves the flow field distribution of the stator vane 12 by setting the second sweep angle C2 to be greater than the first sweep angle C1, the third sweep angle C3 to be greater than the second sweep angle C2, the fourth sweep angle C4 to be greater than the third sweep angle C3, the fifth sweep angle C5 to be less than the fourth sweep angle C4, and the first mount angle to be greater than the second mount angle which is greater than the third mount angle which is equal to the fourth mount angle which is less than the fifth mount angle, thereby improving the performance of the impeller assembly 10, improving the efficiency, and reducing the noise.

The fan that this application embodiment provided, efficiency is higher in the use, and the noise is less.

The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims (10)

1. The utility model provides a stator blade, its characterized in that, includes wheel hub and a plurality of blade, and is a plurality of the blade is followed the even and interval setting of circumference of wheel hub, the blade has relative first face and second face, the one end of blade with the outer peripheral face fixed connection of wheel hub, the other end toward keeping away from wheel hub's direction extension and first toward being close to the direction bending of first face is toward being close to again the direction bending of second face:

the blade is provided with a first section, a second section, a third section, a fourth section and a fifth section in sequence from a blade root to a blade top, the first section, the second section, the third section, the fourth section and the fifth section are uniformly and alternately arranged along the radial direction of the hub, and the blade is continuously and uniformly deformed from the first section to the fifth section;

a plane perpendicular to the axis of the hub is taken as a first projection plane, the projection of the axis of the hub on the first projection plane is taken as a first reference point, the projection of the intersection line of the first surface and the outer peripheral surface of the hub on the first projection plane is taken as a second reference point, and the connecting line of the first reference point and the second reference point is taken as a first reference line;

the projection of the intersection line of the first cross section and the first surface on the first projection plane is a first intersection point, the connecting line of the first intersection point and the first reference point is a first intersection line, and the included angle between the first intersection line and the first reference line is a first sweeping angle;

the projection of the intersection line of the second cross section and the first surface on the first projection plane is a second intersection point, the connecting line of the second intersection point and the first reference point is a second intersection line, the included angle between the second intersection line and the first reference line is a second sweep angle, and the second sweep angle is larger than the first sweep angle;

a projection of an intersection line of the third cross section and the first surface on the first projection plane is a third intersection point, a connecting line of the third intersection point and the first reference point is a third intersection line, an included angle between the third intersection line and the first reference line is a third sweep angle, and the third sweep angle is larger than the second sweep angle;

a projection of an intersection line of the fourth cross section and the first surface on the first projection plane is a fourth intersection point, a connecting line of the fourth intersection point and the first reference point is a fourth intersection line, an included angle between the fourth intersection line and the first reference line is a fourth sweep angle, and the fourth sweep angle is larger than the third sweep angle;

a projection of an intersection line of the fifth cross section and the first surface on the first projection plane is a fifth intersection point, a connecting line of the fifth intersection point and the first reference point is a fifth intersection line, an included angle between the fifth intersection line and the first reference line is a fifth sweep angle, and the fifth sweep angle is smaller than the fourth sweep angle;

taking a plane perpendicular to the first projection plane as a second projection plane, taking a projection of the first projection plane on the second projection plane as a second reference line, and respectively having a first chord, a second chord, a third chord, a fourth chord and a fifth chord in the projections of the first cross section, the second cross section, the third cross section, the fourth cross section and the fifth cross section on the second projection plane;

an acute angle formed by the first string and the second reference line is a first mounting angle, an acute angle formed by the second string and the second reference line is a second mounting angle, an acute angle formed by the third string and the second reference line is a third mounting angle, an acute angle formed by the fourth string and the second reference line is a fourth mounting angle, an acute angle formed by the fifth string and the second reference line is a fifth mounting angle, the first mounting angle is larger than the second mounting angle, the second mounting angle is larger than the third mounting angle, the third mounting angle is equal to the fourth mounting angle, and the fourth mounting angle is smaller than the fifth mounting angle.

2. The vane of claim 1, wherein five circumferential surfaces coaxial with the hub are a first tangential surface, a second tangential surface, a third tangential surface, a fourth tangential surface and a fifth tangential surface, respectively, the first tangential surface, the second tangential surface, the third tangential surface, the fourth tangential surface and the fifth tangential surface are uniformly and alternately arranged along a radial direction of the hub, the first tangential surface, the second tangential surface, the third tangential surface, the fourth tangential surface and the fifth tangential surface intersect with the blade, and the intersecting surfaces of the second tangential surface, the third tangential surface, the fourth tangential surface and the fifth tangential surface with the blade are the first cross section, the second cross section, the third cross section, the fourth cross section and the fifth cross section, respectively.

3. The vane of claim 2 wherein the first sweep angle ranges from 15 ° -20 °, the second sweep angle ranges from 25 ° -30 °, the third sweep angle ranges from 35 ° -40 °, the fourth sweep angle ranges from 40 ° -45 °, and the fifth sweep angle ranges from 35 ° -40 °.

4. A vane according to claim 3, characterized in that the first sweep angle is 20 °, the second sweep angle is 25 °, the third sweep angle is 40 °, the fourth sweep angle is 40 °, and the fifth sweep angle is 35 °.

5. A vane according to any one of claims 1 to 4, characterized in that the first mounting angle ranges from 72 ° to 75 °, the second mounting angle ranges from 69 ° to 72 °, the third mounting angle ranges from 63 ° to 65 °, the fourth mounting angle ranges from 63 ° to 65 °, and the fifth mounting angle ranges from 66 ° to 69 °.

6. The vane of claim 5 wherein the first mounting angle is 72 °, the second mounting angle is 69 °, the third mounting angle is 65 °, the fourth mounting angle is 65 °, and the fifth mounting angle is 69 °.

7. A vane according to any one of claims 1 to 4, characterized in that the maximum thickness of the blade in the first, second, third, fourth and fifth sections is T1, T1, T2, T3, T4 and T5, respectively, T1> T2> T3 < T4< T5.

8. A vane according to claim 7, characterized in that the thickness of the blade is in the range 2.3mm-2.8 mm.

9. An impeller assembly, characterized in that the impeller assembly comprises:

the mounting seat is provided with a mounting hole;

a vane as claimed in any one of claims 1 to 8 fixedly disposed within the mounting bore; and

the movable blade is rotatably arranged in the mounting hole and is coaxially arranged with the static blade.

10. A wind turbine comprising a power plant and an impeller assembly as claimed in claim 9, the power plant being in rotational connection with the blades in the impeller assembly.

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