WO2021233483A1 - Impeller, fan, and air conditioner outdoor unit - Google Patents

Abstract

An impeller, a fan, and an air conditioner outdoor unit. The impeller comprises a hub (1) and at least one blade (2). The blade (2) is formed with a concave curve-shaped front edge (21) and a convex curve-shaped tail edge (22) connected to a root portion of the blade (2) and a peripheral edge (23) connecting the front edge (21) and the tail edge (22). A plurality of elliptical recesses (24) arranged along the peripheral edge (23) of the blade (2) is formed on a suction surface of the blade (2). The plurality of elliptical recesses (24) has long axes pointing toward the peripheral edge (23) and sequentially inclining toward the front edge (21) along a direction from the tail edge (22) to the front edge (21), and has gradually reduced areas. A polygonal recess (25) is further formed on the suction surface. By forming a polygonal recess and a plurality of elliptical recesses adaptive to the shape and size of a blade of the impeller, the weight of the blade is reduced and the connection strength of the blade is ensured.

Description

Wind wheel, fan and outdoor unit of air conditioner Technical field

The invention belongs to the technical field of air conditioners, and specifically relates to a wind wheel, a fan and an outdoor unit of an air conditioner.

Background technique

Air conditioners have become an indispensable electrical product in people's lives, and the performance of air conditioners directly affects people's experience. Air conditioners generally include an outdoor unit and an indoor unit. The fan in the outdoor unit of the air conditioner is configured to dissipate the cold and heat generated by the outdoor heat exchanger.

The fan used in the outdoor unit of the air conditioner is generally an axial fan. The air volume, noise and wind pressure of the axial fan are important indicators for evaluating its performance. The current axial fan mainly reduces the thickness or thinning of the blades of the rotor. The thickness of the hub is used to reduce the weight of the wind wheel, so as to reduce the load of the motor driving the wind wheel and the noise of the axial fan.

However, the existing axial flow fan has the problem that when the thickness of the blades and the hub of the wind wheel is reduced, the strength of the wind wheel itself is also reduced, so that the impeller is easily damaged or even broken.

Correspondingly, a new wind wheel, fan, and outdoor unit of air conditioner are needed in the art to solve the above-mentioned problems.

Summary of the invention

In order to solve the above-mentioned problems in the prior art, that is, to solve the above-mentioned existing axial flow fans, when the thickness of the blades and the hub of the wind wheel is reduced, the strength of the wind wheel itself is also reduced, so that the impeller is easily damaged or even broken. The present invention provides a wind wheel, a fan, and an outdoor unit of an air conditioner.

First of all, the present invention provides a wind wheel that includes a hub and at least one blade; the root of the blade is connected to the outer side wall of the hub, and the blade is formed with a concave curve connected to the root. The leading edge, the trailing edge with a convex curve, and the outer peripheral edge connecting the leading edge and the trailing edge; the suction surface of the blade is formed with a plurality of elliptical grooves distributed along its outer peripheral edge, and the plurality of The major axes of the elliptical grooves all point to the outer peripheral edge and are inclined to the front edge in the direction from the trailing edge to the leading edge, and in the direction from the trailing edge to the leading edge The area of the plurality of elliptical grooves is also gradually reduced; a polygonal groove is also formed on the suction surface of the blade, and the polygonal groove is arranged along the root and the leading edge of the blade in sequence. , The side of the plurality of elliptical grooves away from the outer periphery and the trailing edge form the periphery thereof.

As a preferred technical solution of the above-mentioned wind wheel provided by the present invention, the length of the major axis and the minor axis of each of the elliptical grooves are determined according to the following formula: a _n =a ₁ +(n-1) ×c; b _n = b ₁ +(n-1)×d; where a _n is the length of the long axis of the nth elliptical groove of the blade in the direction from its trailing edge to its leading edge , A ₁ is the length of the major axis of the first elliptical groove of the blade in the direction from its trailing edge to its leading edge, and c is the difference of the major axis between two adjacent elliptical grooves And is a negative value; b _n is the length of the minor axis of the nth elliptical groove of the blade in the direction from its trailing edge to its leading edge, and b ₁ is the length of the blade from its trailing edge to its leading edge. The length of the minor axis of the first elliptical groove in the direction of the leading edge, d is the difference between the minor axis of two adjacent elliptical grooves and is a negative value.

As a preferred technical solution of the above-mentioned wind wheel provided by the present invention, when the outer diameter of the wind wheel is R, a ₁ =1/3R, c=-0.072a, b ₁ =1/10R, d= -0.125b; the distance between the center of the plurality of elliptical grooves and the center of the wind wheel is 0.8R.

As a preferred technical solution of the above-mentioned wind wheel provided by the present invention, the line connecting the center of the oval groove near the trailing edge of the blade and the center of the wind wheel is connected to the outermost end of the trailing edge The angle α between the line with the center of the wind wheel satisfies: 2°<α<5°; and/or, the center of each of the two adjacent elliptic grooves is The angle β formed between the lines between the centers satisfies: 10°<β<15°; and/or, the line between the outermost end of the trailing edge of the blade and the center of the wind wheel and its leading edge The angle δ between the line connecting the outermost end of and the center of the wind wheel satisfies: 81°<δ<85°.

As a preferred technical solution of the above-mentioned wind wheel provided by the present invention, the trailing edge of the blade is provided with a blunt triangle recessed structure, and the connection between the lowest point of the recessed structure and the center of the wind wheel is The angle θ between the line and the line connecting the outermost end of the trailing edge of the blade and the center of the wind wheel satisfies: 5°<θ<7°.

As a preferred technical solution of the above-mentioned wind wheel provided by the present invention, the number of the blades is multiple, and the multiple blades are uniformly arranged on the outer side wall of the hub along the circumferential direction of the hub, and each The projections of the leading edge of each blade and the trailing edge of the adjacent blade on the outer side wall of the hub do not overlap.

As a preferred technical solution of the above-mentioned wind wheel provided by the present invention, the hub includes an outer ring wheel connected with the at least one blade on an outer side wall and an inner ring wheel coaxially arranged inside the outer ring wheel, The inner ring wheel is formed with a shaft hole for connecting with the output shaft of the motor; a plurality of spokes parallel to the axis of the wind wheel and spaced apart are connected between the inner ring wheel and the outer ring wheel; A horizontal plate perpendicular to the axis of the wind wheel is connected between the two adjacent spoke plates, the outer ring wheel and the inner ring wheel, and a through hole is provided in the middle of each of the horizontal plates .

As a preferred technical solution of the above-mentioned wind wheel provided by the present invention, a plurality of limiting grooves are arranged on the inner circumferential surface of the shaft hole at intervals along the axial direction, and the shaft hole is installed with the limiting grooves. An aluminum alloy shaft sleeve with matching grooves, and the aluminum alloy shaft sleeve is used to connect with the output shaft of the motor.

Then, the present invention also provides a fan. The fan includes a motor and the wind wheel in any of the above technical solutions; the output shaft of the motor is connected to the hub of the wind wheel.

Finally, the present invention also provides an outdoor unit of an air conditioner, in which the above-mentioned fan is configured.

In a wind wheel, a fan, and an outdoor unit of an air conditioner provided by the present invention, a plurality of elliptical grooves distributed along the outer periphery are formed on the suction surface of the blade of the wind wheel, and the length of the plurality of elliptical grooves is The shafts all point to the outer periphery and are inclined to the front edge in the direction from the trailing edge to the leading edge, and the area of the multiple elliptical grooves gradually decreases in the direction from the trailing edge to the leading edge; and the suction of the blade The polygonal grooves on the surface are arranged to form the periphery of the blade along the root, the leading edge, the side of the plurality of elliptical grooves away from the outer periphery, and the trailing edge in sequence. Therefore, by providing polygonal grooves and multiple elliptical grooves adapted to the shape and size of the blade, the weight of the blade is reduced, and the overall connection strength of the blade can be ensured, and the thinning of the blade itself is avoided. The strength does not meet the requirements of use.

In addition, in a wind wheel, a fan, and an outdoor unit of an air conditioner provided by the present invention, a plurality of spokes parallel to the axis of the wind wheel and spaced apart are connected between the inner ring wheel and the outer ring wheel of the hub; A horizontal plate perpendicular to the axis of the wind wheel is connected between the two spoke plates, the outer ring wheel and the inner ring wheel, and a through hole is provided in the middle of each horizontal plate. Therefore, the structure of the hub further reduces the overall weight of the wind wheel on the basis of ensuring the connection strength of the hub itself, so as to better reduce the load of the motor in the fan and reduce the noise of the fan.

Description of the drawings

The wind wheel, fan and outdoor unit of the air conditioner of the present invention will be described below with reference to the drawings. In the attached picture:

Figure 1 is a schematic diagram of the structure of the wind wheel of this embodiment;

Figure 2 is a schematic diagram of the structure of the hub in the wind wheel of this embodiment;

3 is a schematic diagram of the structure of the aluminum alloy shaft sleeve and the shaft hole in the wind wheel of this embodiment;

FIG. 4 is a graph of noise comparison test results between the fan of the embodiment and the original fan at different speeds.

List of reference signs

1-wheel hub; 11-outer ring wheel; 12-inner ring wheel; 121-shaft hole; 13-spoke plate; 14-transverse plate; 141-through hole; 15-aluminum alloy shaft sleeve;

2-blade; 21-front edge; 22-tail edge; 23-outer periphery; 24-elliptical groove; 25-polygonal groove; 26-recessed structure.

Detailed ways

The preferred embodiments of the present invention will be described below with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention, and are not intended to limit the protection scope of the present invention. For example, although the wind wheel in the drawings is illustrated with 4 blades as an example, the number of blades on the wind wheel is not static. Without departing from the principles of the present invention, those skilled in the art can make adjustments as needed. It is adjusted to suit the specific application. For example, the number of blades on the wind wheel in this embodiment can also be two or four.

It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The term of the indicated direction or positional relationship is based on the direction or positional relationship shown in the drawings, which is only for ease of description, and does not indicate or imply that the device or element must have a specific orientation, be configured and operated in a specific orientation Therefore, it cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

In addition, it should be noted that, in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, they can be fixed or fixed. It is a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components. For those skilled in the art, the specific meaning of the above-mentioned terms in the present invention can be understood according to specific circumstances.

In order to solve the above-mentioned problems in the prior art, that is, to solve the above-mentioned existing axial flow fans, when the thickness of the blades and the hub of the wind wheel is reduced, the strength of the wind wheel itself is also reduced, so that the impeller is easily damaged or even broken. For the problem, this embodiment provides a wind wheel, a fan, and an outdoor unit of an air conditioner.

First, as shown in Figures 1 to 3, this embodiment provides a wind wheel, which includes a hub 1 and at least one blade 2; the root of the blade 2 is connected to the outer side wall of the hub 1, and the blade 2 is formed with The leading edge 21 with a concave curve connected to the root, a trailing edge 22 with a convex curve, and an outer peripheral edge 23 connecting the leading edge 21 and the trailing edge 22; A plurality of elliptical grooves 24. The long axes of the plurality of elliptical grooves 24 all point to the outer peripheral edge 23 and are inclined to the front edge 21 in the direction from the trailing edge 22 to the leading edge 21, and in the direction from the trailing edge 22 to the leading edge 21. The area of the plurality of elliptical grooves 24 in the direction of the leading edge 21 also gradually decreases; the suction surface of the blade 2 is also formed with a polygonal groove 25, and the polygonal grooves 25 are arranged along the root and the leading edge of the blade 2 in sequence. 21. The side of the plurality of elliptical grooves 24 away from the outer peripheral edge 23 and the trailing edge 22 form the periphery thereof.

Illustratively, it can be understood that the suction surface of the blade 2 is the side on the inlet side of the blade 2. In this embodiment, a plurality of elliptical grooves 24 are provided on the suction surface of the blade 2, and the grooves themselves are used to reduce For the weight of the blade 2, the part of the blade 2 spaced between the adjacent elliptical grooves 24 serves as a reinforcing rib to ensure the overall strength of the blade 2.

At the same time, the shape of the polygonal groove 25 provided on the suction surface of the blade 2 is also compatible with the shape and size of the blade 2 itself, and the position and size of the multiple elliptical grooves 24 provided. The polygonal groove 25 is used for In order to reduce the weight of the blade 2 near the root position. The part between the periphery of the polygonal groove 25 and the root of the blade 2, the leading edge 21, the side of the plurality of elliptical grooves 24 away from the outer peripheral edge 23 and the trailing edge 22 has a reinforcing rib to ensure the overall strength of the blade 2. And further improve the operating efficiency of the fan.

In short, the polygonal groove 25 and the multiple elliptical grooves 24 on the blade 2 of the present embodiment are not randomly arranged. When they are installed, the position, size and shape of the blade 2 are all considered to reduce the weight and weight of the blade 2. A factor that guarantees the strength of the blade 2.

In a wind wheel provided by this embodiment, a plurality of elliptical grooves 24 distributed along the outer peripheral edge 23 are formed on the suction surface of the blade 2 of the wind wheel, and the major axes of the plurality of elliptical grooves 24 are equal to each other. Point to the outer peripheral edge 23 and incline to the front edge 21 sequentially in the direction from the trailing edge 22 to the front edge 21, and the area of the plurality of elliptical grooves 24 gradually decreases in the direction from the trailing edge 22 to the front edge 21 And the polygonal groove 25 on the suction surface of the blade 2 is arranged to form its periphery along the root of the blade 2, the leading edge 21, the side of the plurality of elliptical grooves 24 away from the outer peripheral edge 23, and the trailing edge 22 in sequence. Therefore, by providing a polygonal groove 25 and a plurality of elliptical grooves 24 that are compatible with the shape and size of the blade 2, the weight of the blade 2 is reduced, and the overall connection strength of the blade 2 is ensured, and the blade 2 is avoided. The problem that its own strength does not meet the requirements of use after thinning.

As a preferred implementation of the above-mentioned wind wheel provided by this embodiment, the lengths of the major axis and minor axis of each elliptical groove 24 are determined according to the following formula: a _n =a ₁ +(n-1) ×c; b _n = b ₁ +(n-1)×d; where a _n is the major axis of the n-th elliptical groove 24 of the blade 2 in the direction from its trailing edge 22 to its leading edge 21 A ₁ is the length of the long axis of the first elliptical groove 24 of the blade 2 in the direction from its trailing edge 22 to its leading edge 21, and c is the length between two adjacent elliptical grooves 24 The difference of the major axis is negative; b _n is the length of the minor axis of the n-th elliptical groove 24 of the _{blade 2 in the direction from its trailing edge 22 to its leading edge 21, and b 1} is the length of the blade 2 in the direction from its trailing edge 22 to its leading edge 21. The length of the minor axis of the first elliptical groove 24 in the direction from its trailing edge 22 to its leading edge 21, d is the difference between the minor axis of two adjacent elliptical grooves 24 and is a negative value .

Exemplarily, in this embodiment, the major axis and minor axis of the multiple elliptical grooves 24 are all reduced in the form of an arithmetic sequence, so that the weight of the different positions of the blade 2 is gradually reduced, thereby The weight of each part of the blade 2 is basically equal, which helps to ensure the operating efficiency of the fan.

At the same time, the change in the size of the elliptical groove 24 and the change in the major axis direction are both for adapting to the shape and size of the blade 2 itself, so as to sufficiently and reasonably reduce the weight of the blade 2 without causing its own The strength is greatly reduced.

As a preferred implementation of the above-mentioned wind wheel provided by this embodiment, when the outer diameter of the wind wheel is R, a ₁ =1/3R, c=-0.072a, b ₁ =1/10R, d=- 0.125b; the distance between the center of the plurality of elliptical grooves 24 and the center of the wind wheel is 0.8R.

At the same time, it is understandable that the above-mentioned size design of the elliptical groove 24 is a preferred embodiment of this embodiment, and the new technical solution formed by those skilled in the art according to the adjustment of the logarithmic value still belongs to the present invention. The scope of the example description.

As a preferred implementation of the above-mentioned wind wheel provided by this embodiment, the line connecting the center of the oval groove 24 of the blade 2 near the trailing edge 22 and the center of the wind wheel is connected to the outermost end of the trailing edge 22 and the wind wheel. The angle α between the lines of the center of the circle satisfies: 2°<α<5°, and the preferred α is 3°; and/or, the center of each of the two adjacent elliptical grooves 24 and the center of the wind wheel The angle β formed between the connecting lines satisfies: 10°<β<15°, and the preferred β is 13°; and/or, the line connecting the outermost end of the trailing edge 22 of the blade 2 and the center of the wind wheel The angle δ between the outermost end of its leading edge 21 and the center of the wind wheel satisfies: 81°<δ<85°, preferably δ=83°, so as to determine the chord length of the blade 2 and the two blades 2 At this angle, the size and layout of the blade 2 are more reasonable.

As a preferred embodiment of the above-mentioned wind wheel provided by this embodiment, the trailing edge 22 of the blade 2 is provided with a blunt triangle recessed structure 26, and the line between the lowest point of the recessed structure 26 and the center of the wind wheel is connected to The angle θ between the outermost end of the trailing edge 22 of the blade 2 and the center of the wind wheel satisfies: 5°<θ<7°.

Illustratively, the hub 1 is connected to a motor, and the rotation of the motor shaft drives the hub 1 to rotate, thereby driving the blades 2 to rotate around the axial direction, so that the airflow flows. When the blade 2 rotates in the axial direction, the airflow forms a vortex at the trailing edge 22 of the blade 2. The nearly "Δ"-shaped recessed structure 26 of the trailing edge 22 of the blade 2 reduces the wake vortex, thereby reducing the vortex noise, and ultimately reducing the rotation of the wind turbine. The noise generated at the time.

As a preferred implementation of the above-mentioned wind wheel provided by this embodiment, the number of blades 2 is multiple, and the plurality of blades 2 are evenly arranged on the outer side wall of the hub 1 along the circumferential direction of the hub 1, and each blade 2 The projections of the leading edge 21 of the leading edge 21 and the trailing edge 22 of the adjacent blade 2 on the outer side wall of the hub 1 do not overlap.

Exemplarily, a plurality of blades 2 are evenly distributed on the side wall of the hub 1, so that the fan rotates more smoothly and cuts the air flow more uniformly, thereby further reducing the noise during the rotation of the wind wheel. Moreover, the projections of the leading edge 21 of each blade 2 and the trailing edge 22 of the adjacent blade 2 on the end surface of the hub 1 do not overlap, that is, the adjacent blades 2 are separated by a certain distance, and the airflow is between the two adjacent blades 2. There is no whirlpool, which can further improve the air supply efficiency of the wind wheel.

As shown in Figures 2 and 3, as a preferred embodiment of the above-mentioned wind wheel provided in this embodiment, the hub 1 includes an outer ring wheel 11 with at least one blade 2 connected to the outer side wall and coaxially arranged on the outer ring. The inner ring wheel 12 inside the wheel 11, the inner ring wheel 12 is formed with a shaft hole 121 for connecting with the output shaft of the motor; A plurality of spokes 13; the adjacent two spokes 13 and the outer ring wheel 11 and the inner ring wheel 12 are connected with a transverse plate 14 perpendicular to the axis of the wind wheel, and the middle of each transverse plate 14 is provided with a through孔141.

Therefore, the structure of the hub 1 further reduces the overall weight of the wind wheel on the basis of ensuring the connection strength of the hub 1 itself, so as to better reduce the load of the motor in the fan and reduce the noise of the fan.

As shown in Figures 2 and 3, as a preferred implementation of the above-mentioned wind wheel provided in this embodiment, in order to further ensure the cooperation between the output shaft of the motor and the hub 1, the inner peripheral surface of the shaft hole 121 A plurality of limiting grooves are arranged on the upper part at intervals along its axial direction, and an aluminum alloy shaft sleeve 15 matching the limiting groove direction is installed in the shaft hole 121, and the aluminum alloy shaft sleeve 15 is used for connecting with the output shaft of the motor.

Exemplarily, the wind wheel in the outdoor unit of the air conditioner is generally relatively large, and its torque is relatively large during operation. If the plastic hub 1 is used, the plastic hub 1 needs to be taken into consideration for its demolding, resulting in a certain inclination angle, and the shaft hole The diameter of 121 is different from top to bottom. When it is matched with the output shaft of the motor, the gap may be inconsistent. Long-term operation may cause wear and tear to the hub 1, which poses a certain safety hazard.

In this embodiment, an aluminum alloy shaft sleeve 15 is installed in the shaft hole 121 of the wheel hub 1 to match its limiting groove. The aluminum alloy material itself has the advantage of lighter weight, and the aluminum alloy is more wear-resistant than plastic. The alloy shaft sleeve 15 can effectively solve the above-mentioned potential safety hazards.

Then, this embodiment also provides a fan. The fan includes a motor and the wind wheel in any of the above embodiments; the output shaft of the motor is connected to the hub 1 of the wind wheel.

Exemplarily, combined with the noise comparison test results of the fan and the original fan at different speeds of the fan proposed in this embodiment in FIG. 4, it can be seen that the fan of this embodiment basically has a noise reduction close to 1dB under the same speed condition, and the improvement effect is compared. obvious.

Finally, this embodiment also provides an outdoor unit of an air conditioner, and the above-mentioned fan is configured in the outdoor unit of the air conditioner.

Of course, the above-mentioned alternative implementations, as well as alternative implementations and preferred implementations, can also be used in cross-coordination, so as to combine new implementations to be suitable for more specific application scenarios.

In addition, those skilled in the art can understand that although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments means that they are protected by the present invention. Within the scope and form different embodiments. For example, in the claims of the present invention, any one of the claimed embodiments can be used in any combination.

So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims (10)

1. A wind wheel, characterized in that the wind wheel comprises a hub and at least one blade; the root of the blade is connected to the outer side wall of the hub, and the blade is formed with a concave curved leading edge connected to the root , A convex curved trailing edge and an outer peripheral edge connecting the leading edge and trailing edge;

   A plurality of elliptical grooves distributed along the outer periphery of the blade are formed on the suction surface of the blade. The direction of the edge is inclined to the front edge in sequence, and the area of the plurality of elliptical grooves gradually decreases in the direction from the trailing edge to the front edge;

   A polygonal groove is also formed on the suction surface of the blade, and the polygonal groove is arranged to sequentially follow the root of the blade, the leading edge, and a portion of the plurality of elliptical grooves away from the outer periphery. The side and the trailing edge form its periphery.
2. The wind wheel according to claim 1, wherein the lengths of the major axis and the minor axis of each of the elliptical grooves are determined according to the following formula:

   a _n =a ₁ +(n-1)×c; b _n =b ₁ +(n-1)×d;

   Wherein, a _n is the length of the long axis of the nth elliptical groove of the blade in the direction from its trailing edge to its leading edge, and a ₁ is the length of the blade from its trailing edge to its leading edge. The length of the major axis of the first elliptical groove in the direction, c is the difference between the major axis of two adjacent elliptical grooves and is a negative value; b _n is the blade from its trailing edge to The length of the minor axis of the nth elliptical groove in the direction of its leading edge, b ₁ is the minor axis of the first elliptical groove of the blade in the direction from its trailing edge to its leading edge Length, d is the difference between the minor axis of two adjacent elliptical grooves and is a negative value.
3. The wind wheel according to claim 2, wherein when the outer diameter of the wind wheel is R, a ₁ =1/3R, c=-0.072a, b ₁ =1/10R, d=-0.125 b;

   The distance between the center of the plurality of elliptical grooves and the center of the wind wheel is 0.8R.
4. The wind wheel according to claim 1, characterized in that:

   The angle α between the line between the center of the elliptical groove near the trailing edge of the blade and the center of the wind wheel and the line between the outermost end of the trailing edge and the center of the wind wheel Satisfies: 2°＜α ＜5°; and/or,

   The included angle β formed between the center of each of the two adjacent elliptical grooves and the center of the wind wheel satisfies: 10°<β<15°; and/or,

   The angle δ between the line between the outermost end of the trailing edge of the blade and the center of the wind wheel and the line between the outermost end of the front edge and the center of the wind wheel satisfies: 81°<δ< 85°.
5. The wind wheel according to claim 1, wherein the trailing edge of the blade is provided with a blunt triangle recessed structure, and the line between the lowest point of the recessed structure and the center of the wind wheel is The included angle θ between the line connecting the outermost end of the trailing edge of the blade and the center of the wind wheel satisfies: 5°<θ<7°.
6. The wind turbine according to claim 1, wherein the number of the blades is multiple, and the multiple blades are uniformly arranged on the outer side wall of the hub along the circumferential direction of the hub, and each of the blades The projections of the leading edge of the blade and the trailing edge of the adjacent blade on the outer side wall of the hub do not overlap.
7. The wind wheel according to claim 1, wherein the hub includes an outer ring wheel connected with the at least one blade on an outer side wall and an inner ring wheel coaxially arranged inside the outer ring wheel, and The inner ring wheel is formed with a shaft hole for connecting with the output shaft of the motor;

   A plurality of spokes parallel to the axis of the wind wheel and spaced apart are connected between the inner ring wheel and the outer ring wheel; two adjacent spokes are connected to the outer ring wheel and the A horizontal plate perpendicular to the axis of the wind wheel is connected between the inner ring wheels, and a through hole is provided in the middle of each of the horizontal plates.
8. The wind wheel according to claim 7, characterized in that: the inner circumferential surface of the shaft hole is provided with a plurality of limiting grooves spaced along the axial direction thereof, and the shaft hole is installed with the limiting groove in the direction of the limiting groove. A matching aluminum alloy shaft sleeve, which is used to connect with the output shaft of the motor.
9. A fan, characterized in that: the fan comprises a motor and the wind wheel according to any one of claims 1 to 8;

   The output shaft of the motor is connected with the hub of the wind wheel.
10. An outdoor unit of an air conditioner, wherein the fan according to claim 9 is arranged in the outdoor unit of the air conditioner.

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