Wind wheel, outdoor unit and air conditioner

Abstract

The wind wheel comprises a hub and a plurality of blades, the blades are connected to the circumferential wall of the hub and arranged at intervals in the circumferential direction of the hub, each blade comprises a body part and a front edge part, and the front edge parts are located at the front ends of the body parts in the rotation direction of the wind wheel. The body part is provided with a suction surface facing the air inlet side of the wind wheel, and the front edge part protrudes relative to the suction surface; the maximum outer diameter of the wind wheel is D, the maximum axial size of the wind wheel in the direction of the rotating axis is L, and the L / D is larger than or equal to 0.3 and smaller than or equal to 0.41. According to the wind wheel, the air volume can be increased, and meanwhile noise is lowered.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to a wind wheel, an outdoor unit and an air conditioner. Background Art

[0002] In order to enhance the heat dissipation capacity, the outdoor unit of the existing air conditioner has a larger wind wheel to increase the air volume. However, the blade area of ​​the wind wheel will also increase. During the rotation of the wind wheel, the blade will produce a large periodic vibration and generate noise, resulting in increased aerodynamic noise. Therefore, how to balance the wind volume and aerodynamic noise of the wind wheel is a problem that still needs to be solved. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a wind wheel that can increase the air volume and reduce noise at the same time.

[0004] The utility model also provides an outdoor unit and an air conditioner with the wind wheel.

[0005] According to the first aspect of the present invention, the wind wheel has a rotation axis, including a hub; a plurality of blades are connected to the peripheral wall of the hub and arranged at intervals along the circumference of the hub, the blades include a main body and a leading edge, the leading edge is located at the front end of the main body along the rotation direction of the wind wheel, the main body has a suction surface facing the wind inlet side of the wind wheel, and the leading edge is protruding relative to the suction surface; wherein the maximum outer diameter of the wind wheel is D, and along the direction of the rotation axis, the maximum axial dimension of the wind wheel is L, satisfying: 0.3≤L / D≤0.41.

[0006] The wind wheel according to the first embodiment of the utility model has at least the following beneficial effects: by making the maximum outer diameter D of the wind wheel and the maximum axial dimension L of the wind wheel satisfy 0.3≤L / D≤0.41, under the premise that the outer diameter of the wind wheel is determined, the value of L / D is within a larger range, so that the maximum axial dimension of the wind wheel is larger, so as to increase the area of ​​the blade, thereby achieving an increase in the wind volume of the wind wheel. At the same time, the suction surface of the leading edge relative to the main body is convexly arranged, on the one hand, so that the wall surface of the blade facing the wind outlet side remains flat to stabilize the wind outlet, and on the other hand, the thickness of the leading edge can be increased, thereby increasing the structural strength of the leading edge and the blade as a whole, and having strong pressure resistance. During the rotation of the wind wheel, the periodic vibration caused by the leading edge cutting the air can be reduced, thereby effectively reducing the aerodynamic noise.

[0007] According to some embodiments of the present invention, the leading edge portion is bent relative to the main body portion toward the wind outlet side of the wind wheel.

[0008] According to some embodiments of the present invention, the included angle between the front edge portion and the main body portion is θ, which satisfies: 30°≤θ≤45°.

[0009] According to some embodiments of the utility model, the leading edge portion is provided with a plurality of first recesses, which are located on a side of the leading edge portion facing the wind inlet side of the wind wheel and are arranged at intervals along the length direction of the leading edge portion.

[0010] According to some embodiments of the present invention, the blade further includes an outer edge portion, the outer edge portion is located at an end of the main body portion away from the hub, and the outer edge portion is protruded relative to the suction surface.

[0011] According to some embodiments of the utility model, the outer edge portion is provided with a plurality of second recesses, and the plurality of second recesses are located on a side of the outer edge portion facing the wind inlet side of the wind wheel and are arranged at intervals along the length direction of the outer edge portion.

[0012] According to some embodiments of the present invention, the main body portion includes a plurality of reinforcing ribs, and the plurality of reinforcing ribs are located on one side of the suction surface and are arranged at intervals along the radial direction of the hub.

[0013] According to some embodiments of the present utility model, the blade further includes a trailing edge portion, the trailing edge portion is located at the rear end of the main body portion along the rotation direction of the wind wheel, and the trailing edge portion is protruded relative to the suction surface.

[0014] According to some embodiments of the present invention, the trailing edge portion is provided with a plurality of serrations, and the plurality of serrations are located at one end of the trailing edge portion close to the hub.

[0015] According to some embodiments of the present invention, the blade further includes a root portion, the root portion is located at one end where the main body portion is connected to the hub, and a structure of the blade close to the root portion is arranged to protrude relative to the suction surface.

[0016] The outdoor unit according to the embodiment of the second aspect of the utility model comprises the wind wheel of the embodiment of the first aspect of the utility model.

[0017] According to the outdoor unit of the second embodiment of the utility model, there are at least the following beneficial effects: due to the use of the above-mentioned wind wheel, the outdoor unit makes the maximum outer diameter D of the wind wheel and the maximum axial dimension L of the wind wheel meet 0.3≤L / D≤0.41. Under the premise that the outer diameter of the wind wheel is determined, the value of L / D is within a larger range, so that the maximum axial dimension of the wind wheel is larger, so as to increase the area of ​​the blade, thereby achieving the purpose of increasing the wind volume of the wind wheel. At the same time, the suction surface of the leading edge relative to the main body is convexly arranged, on the one hand, so that the wall surface of the blade facing the wind outlet side remains flat to stabilize the wind outlet, and on the other hand, the thickness of the leading edge can be increased, thereby increasing the structural strength of the leading edge and the blade as a whole, and the compressive resistance is strong. During the rotation of the wind wheel, the periodic vibration caused by the leading edge cutting the air can be reduced, thereby effectively reducing the aerodynamic noise.

[0018] An air conditioner according to an embodiment of the third aspect of the utility model includes an outdoor unit according to an embodiment of the second aspect of the utility model.

[0019] The air conditioner according to the third embodiment of the utility model has at least the following beneficial effects: the air conditioner adopts the above-mentioned outdoor unit, by making the maximum outer diameter D of the wind wheel and the maximum axial dimension L of the wind wheel satisfy 0.3≤L / D≤0.41, under the premise of determining the outer diameter of the wind wheel, the value of L / D is within a larger range, so that the maximum axial dimension of the wind wheel is larger, so as to increase the area of ​​the blade, thereby achieving the purpose of increasing the wind volume of the wind wheel. At the same time, the suction surface of the leading edge relative to the main body is convexly arranged, on the one hand, so that the wall surface of the blade facing the wind outlet side remains flat to stabilize the wind outlet, and on the other hand, the thickness of the leading edge can be increased, thereby increasing the structural strength of the leading edge and the blade as a whole, and the compressive resistance is strong. During the rotation of the wind wheel, the periodic vibration caused by the leading edge cutting the air can be reduced, thereby effectively reducing the aerodynamic noise.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0022] Figure 1 This is a front view of the wind wheel of the embodiment of the utility model;

[0023] Figure 2 yes Figure 1 Sectional view at AA in the middle;

[0024] Figure 3 is a side view of a wind wheel according to an embodiment of the utility model;

[0025] Figure 4It is a rear view of the wind wheel of the embodiment of the utility model;

[0026] Figure 5 It is a comparison diagram of the noise and wind volume relationship curve of the wind wheel of the embodiment of the utility model and the prior art.

[0027] Reference numerals:

[0028] Wheel hub 100;

[0029] Blade 200; body 210; suction surface 211; pressure surface 212; reinforcing rib 213; leading edge 220; first recess 221; trailing edge 230; serration 231; outer edge 240; second recess 241; root 250;

[0030] Axis of rotation Z. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0034] In the description of the present utility model, unless otherwise clearly defined, terms such as setting, installing, connecting, assembling, and matching should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present utility model based on the specific content of the technical solution.

[0035] Reference Figures 1 to 5As shown, a first embodiment of the utility model provides a wind wheel, which is applied to an outdoor unit of an air conditioner and is installed on a motor to form a fan, so as to enhance the heat dissipation of a heat exchanger of the outdoor unit.

[0036] Reference Figure 1 As shown, it can be understood that the wind wheel includes a hub 100 and a plurality of blades 200. The hub 100 is generally cylindrical and can be fixedly mounted on the rotating shaft of the motor. The plurality of blades 200 are connected to the peripheral wall of the hub 100 and extend radially outward from the hub 100. Generally speaking, the angle between the blades 200 and the rotation axis Z of the wind wheel is an acute angle, and the rotation axis Z of the wind wheel is the central axis of the hub 100. The plurality of blades 200 are arranged at equal intervals along the circumference of the hub 100, and the angle between each blade 200 and the rotation axis Z of the wind wheel is equal. In this embodiment, the number of blades 200 is three, and the three blades 200 are arranged at equal intervals along the circumference of the hub 100.

[0037] Of course, it is easily understood that in other embodiments, the number of blades 200 may be four, five or more.

[0038] Reference Figure 1 and Figure 4 As shown, it can be understood that the blade 200 is defined to have a width along the radial direction of the hub 100, and the width of the front end of the blade 200 along the rotation direction of the wind rotor is smaller than the width of the rear end of the blade 200 along the rotation direction of the wind rotor. Specifically, the blade 200 includes a main body 210, a leading edge 220, a trailing edge 230, an outer edge 240 and a root 250, wherein the leading edge 220 is located at the front end of the main body 210 along the rotation direction of the wind wheel, the trailing edge 230 is located at the rear end of the main body 210 along the rotation direction of the wind wheel, the outer edge 240 is located at the end of the main body 210 away from the hub 100, and the two ends of the outer edge 240 are respectively connected to the end of the leading edge 220 away from the hub 100 and the end of the trailing edge 230 away from the hub 100, and the root 250 is the position where the main body 210 is connected to the hub 100, that is, the root 250 is located at the end of the main body 210 close to the hub 100, and the two ends of the root 250 are respectively connected to the end of the leading edge 220 close to the hub 100 and the end of the trailing edge 230 close to the hub 100.

[0039] Reference Figure 3As shown, it can be understood that the wind wheel is an axial flow type, that is, when the wind wheel rotates, the air flow can flow along the direction of the rotation axis Z of the wind wheel. Along the direction of the rotation axis Z of the wind wheel, the wind wheel has an air outlet side and an air inlet side, that is, the air outlet side is the side where the wind flows out of the wind wheel, and the air inlet side is the side where the wind flows into the wind wheel. Along the direction of the rotation axis Z of the wind wheel, the two wall surfaces facing away from the main body 210 are the suction surface 211 and the pressure surface 212, wherein the wall surface facing the air inlet side is the suction surface 211, and the wall surface facing the air outlet side is the pressure surface 212.

[0040] Reference Figure 1 and Figure 3 As shown, it can be understood that the maximum outer diameter of the wind rotor is defined as D, that is, D is twice the maximum distance between the outer edge portion 240 and the rotation axis Z of the wind rotor. Along the direction of the rotation axis Z of the wind rotor, the maximum axial dimension of the wind rotor is defined as L, that is, L is the maximum distance between the leading edge portion 220 and the trailing edge portion 230 in the direction of the rotation axis Z of the wind rotor. The maximum outer diameter D of the wind rotor and the maximum axial dimension L of the wind rotor satisfy: 0.3≤L / D≤0.41, that is, the ratio of the maximum axial dimension to the maximum outer diameter of the wind rotor is between 0.3 and 0.41.

[0041] Reference Figure 1 and Figure 3 As shown, it can be understood that, generally speaking, the radial installation space of the wind wheel is determined by the housing of the outdoor unit, and the radial installation space of the wind wheel is relatively determined, that is, under the premise that the maximum outer diameter D of the wind wheel is determined, making L / D ≥ 0.3 can make the maximum axial dimension of the wind wheel larger, thereby increasing the area of ​​the blade 200 and achieving the air volume of the increased air volume, that is, at the same speed, the air volume of the wind wheel is effectively increased; making L / D ≤ ​​0.41 can avoid the disadvantage of the structural strength being significantly reduced due to the excessive area of ​​the blade 200, and effectively ensure the air volume of the wind wheel. Therefore, making 0.3 ≤ L / D ≤ ​​0.41, for example, the value of L / D is 0.3, 0.32, 0.34, 0.36, 0.38 or 0.41, etc., can not only make the overall structural strength of the wind wheel meet the requirements, but also effectively increase the air volume. In this embodiment, under the premise of satisfying 0.3≤L / D≤0.41, the maximum axial dimension L of the wind wheel is increased from the original 145mm to 175mm. Under the premise of ensuring that the structural strength meets the requirements, the air volume can be significantly increased. At the same rotation speed, the air volume can be increased by 10.5%.

[0042] It is understandable that, during the rotation of the wind rotor, the leading edge 220 first cuts the air, and the leading edge 220 in the blade 200 has the largest pressure and turbulent kinetic energy, which will cause the leading edge 220 to deform greatly, and the leading edge 220 will periodically reciprocate along the direction of the rotation axis Z of the wind rotor, especially at the intersection of the leading edge 220 and the outer edge 240 (i.e., at the blade tip), thereby generating greater aerodynamic noise and affecting the stability of the blade 200. At the same time, due to the increase in the area of ​​the blade 200, the vibration of the leading edge 220 is more obvious, and the aerodynamic noise is greater.

[0043] For this purpose, refer to Figure 1 and Figure 4 As shown, it can be understood that the leading edge 220 is convexly arranged relative to the suction surface 211 of the main body 210, and the wall surface of the leading edge 220 on the side facing the wind outlet side is flush with the pressure surface 212 of the main body 210, so that the thickness of the leading edge 220 along the direction of the rotation axis Z of the wind wheel can be increased. It is easy to understand that in order to make the leading edge 220 easy to cut the air, the thickness of the leading edge 220 decreases along the rotation direction of the wind wheel, so that the front end of the leading edge 220 (that is, the front end along the rotation direction of the wind wheel) is close to the tip. In this way, the structural strength of the leading edge 220 and the blade 200 as a whole can be increased, and the pressure resistance is strong. During the rotation of the wind wheel, the periodic vibration caused by the leading edge 220 cutting the air can be reduced, and the aerodynamic noise can be effectively reduced. At the same time, since the wall surface of the leading edge portion 220 facing the air outlet side is flush with the pressure surface 212 of the main body 210, the wall surface of the blade 200 facing the air outlet side remains flat to achieve stable air outlet.

[0044] Reference Figure 5 As shown, it can be understood that the figure shows the comparison between the relationship curve between the noise and air volume of the present solution and the relationship curve between the noise and air volume of the prior art solution. As can be seen from the figure, the noise increases with the increase of air volume, and the air volume value is 3500m 3 / h to 7500m 3 / h, when the wind volume generated by the wind wheel is the same, the noise of this solution is significantly lower than that of the prior art solution, and the noise value is reduced by about 3dB. Therefore, the wind wheel of this solution can effectively reduce noise.

[0045] Reference Figure 2 As shown, it can be understood that the leading edge portion 220 is bent relative to the main body portion 210 toward the wind outlet side of the wind wheel, that is, the leading edge portion 220 as a whole is flipped relative to the main body portion 210 toward the wind outlet side at a certain angle, and the angle is an acute angle. In this way, during the rotation of the wind wheel, the leading edge portion 220 can better guide the wind to the pressure surface 212, thereby improving the wind field, facilitating the balance of wind pressure on the two side walls of the blade 200 along the direction of the rotation axis Z of the wind wheel, reducing the vibration of the blade 200, and effectively reducing noise.

[0046] Reference Figure 2 As shown, it can be understood that the angle between the leading edge portion 220 and the main body portion 210 is defined as θ, which satisfies: 30°≤θ≤45°. When θ≥30°, the turning angle of the leading edge portion 220 can be guaranteed to effectively guide the wind to improve the wind field; when θ≤45°, the leading edge portion 220 can be prevented from being bent too much and hindering the wind flow, that is, the leading edge portion 220 can be prevented from increasing the wind resistance. Therefore, when 30°≤θ≤45°, for example, θ=30°, θ=35°, θ=40° or θ=45°, the wind resistance is small, and the wind field can be effectively improved and the noise can be reduced.

[0047] Reference Figure 4 As shown, it can be understood that the wind wheel is generally a plastic part. Since the thickness of the leading edge portion 220 is relatively thicker than the main body 210, the overall thickness of the blade 200 is uneven, which is easy to cause quality problems such as deformation and shrinkage during the injection molding production process, and the defect rate is high. For this reason, the leading edge portion 220 is provided with a plurality of first recesses 221, which are located on the side of the leading edge portion 220 facing the air inlet side and are blind hole structures to avoid affecting the flatness of the wall surface of the blade 200 facing the air outlet side. The shape of the first recess 221 can be circular, elliptical, etc., and the plurality of first recesses 221 are arranged at equal intervals along the length direction of the leading edge portion 220. Of course, the intervals can also be unequal. The length direction of the leading edge portion 220 is the direction from the root 250 along the leading edge portion 220 to the outer edge portion 240 and the reverse direction. Therefore, the problem of uneven thickness of the blade 200 as a whole can be improved, and at the same time, the weight of the wind wheel can be reduced, the self-load can be reduced, and the wind wheel can be ensured to operate smoothly at high speed, and the material consumption can be reduced, and the cost can be reduced. In addition, the first concave portion 221 can also improve the wind field to achieve the purpose of reducing noise.

[0048] Reference Figure 4 As shown, it can be understood that, since the outer edge 240 is far away from the hub 100 and the outer edge 240 has a long length along the circumference of the hub 100, the outer edge 240 is more likely to deform and vibrate during the rotation of the wind wheel. For this reason, the outer edge 240 is arranged to protrude relative to the suction surface 211, that is, the thickness of the outer edge 240 is increased, thereby increasing the structural strength of the outer edge 240 and the structural strength of the blade 200 as a whole, reducing the vibration of the outer edge 240, and thus effectively reducing noise.

[0049] Reference Figure 1As shown, it can be understood that the outer edge 240 is also protruding relative to the pressure surface 212, and the outer edge 240 and the pressure surface 212 have a smooth transition, so the thickness of the outer edge 240 can be further increased to reduce vibration and noise. At the same time, the wall surface of the blade 200 facing the wind outlet side can be relatively flat to achieve stable wind outlet. Of course, the wall surface of the outer edge 240 facing the wind outlet side can also be flush with the pressure surface 212.

[0050] Reference Figure 4 As shown, it can be understood that, similarly, the outer edge 240 is provided with a plurality of second recesses 241, which are located on the side of the outer edge 240 facing the air inlet side and are blind hole structures to avoid affecting the flatness of the wall surface of the blade 200 facing the air outlet side. The shape of the second recess 241 can be circular, elliptical or waist-shaped, etc., and the plurality of second recesses 241 are arranged at equal intervals along the length direction of the outer edge 240. Of course, the intervals can also be unequal, and the length direction of the outer edge 240 is the circumference of the hub 100. Therefore, the problem of uneven thickness of the blade 200 as a whole can be improved, and at the same time, the weight of the wind wheel can be reduced, the self-load can be reduced, and the wind wheel can be ensured to run smoothly at high speed, and the material consumption can be reduced, thereby reducing costs. In addition, the second recess 241 can also improve the wind field to achieve the purpose of reducing noise.

[0051] Reference Figure 4 As shown, it can be understood that the second recess 241 is a waist-shaped structure, and the length direction of the waist-shaped second recess 241 is the same as the length direction of the outer edge portion 240, so that a smaller number of second recesses 241 can improve the problem of uneven thickness of the entire blade 200 and reduce the difficulty of processing and demolding.

[0052] Reference Figure 4 As shown, it can be understood that the main body 210 includes a plurality of reinforcing ribs 213, and the reinforcing ribs 213 are arranged on the suction surface 211 and extend circumferentially of the hub 100. The plurality of reinforcing ribs 213 are arranged at equal intervals along the radial direction of the hub 100, thereby further increasing the structural strength of the blade 200, reducing vibration and noise, and avoiding affecting the flatness of the wall surface of the blade 200 facing the air outlet side.

[0053] Reference Figure 1 and Figure 4 As shown, it can be understood that the trailing edge portion 230 is convexly arranged relative to the suction surface 211, and the wall surface of the trailing edge portion 230 facing the air outlet side is flush with the pressure surface 212 of the main body 210, so that the wall surface of the blade 200 facing the air outlet side is kept as flat as possible to achieve stable air outlet. Therefore, the thickness of the trailing edge portion 230 can be increased, thereby increasing the structural strength of the trailing edge portion 230 and the overall structural strength of the blade 200, reducing the vibration of the trailing edge portion 230, and thus effectively reducing noise.

[0054] Reference Figure 1 and Figure 4 As shown, it can be understood that the position of the blade 200 near the root 250 is convex relative to the suction surface 211, and the wall surface of the position facing the wind outlet side is flush with the pressure surface 212 of the main body 210, so that the wall surface of the blade 200 facing the wind outlet side is kept as flat as possible to achieve stable wind outlet. Therefore, the connection strength between the blade 200 and the hub 100 can be enhanced, and the stability of the blade 200 during the rotation of the wind wheel can be improved, which is conducive to stable wind outlet to ensure wind volume and reduce noise.

[0055] Reference Figure 4 As shown, it can be understood that only one of the trailing edge portion 230 and the position of the blade 200 near the root 250 can be thickened, or both can be thickened. When the trailing edge portion 230 and the position of the blade 200 near the root 250 are both thickened, the periphery of the blade 200 is thickened relative to the main body 210, thereby effectively increasing the structural strength of the blade 200 and the wind rotor as a whole, and improving the stability of the blade 200 during the rotation of the wind rotor, which is conducive to stabilizing the wind output to ensure the wind volume and reduce noise.

[0056] Reference Figure 1 and Figure 4 As shown, it can be understood that during the rotation of the wind wheel, the airflow flows from the leading edge 220 to the trailing edge 230 along the wall of the blade 200, and flow separation will occur near the trailing edge 230, especially the flow separation phenomenon is more obvious at the position where the trailing edge 230 is close to the hub 100. The flow separation means that the airflow leaves the wall of the blade 200 and flows backward or horizontally. The airflow at this position is turbulent and turbulence is generated, resulting in noise. For this reason, the trailing edge 230 is provided with a plurality of sawtooth portions 231, and the plurality of sawtooth portions 231 are located at one end of the trailing edge 230 close to the hub 100 and are arranged in sequence along the length direction of the trailing edge 230. Therefore, by providing the sawtooth portion 231, turbulence can be broken, and the turbulence near the trailing edge 230 can be reduced, thereby effectively reducing the noise generated by turbulence.

[0057] The outdoor unit of the second embodiment of the utility model comprises a motor and a wind wheel of the first embodiment of the utility model, wherein the wind wheel is mounted on the rotating shaft of the motor and forms a fan to enhance the heat dissipation of the heat exchanger of the outdoor unit. The outdoor unit can be used for a wall-mounted air conditioner, a cabinet air conditioner or a central air conditioner, etc.

[0058] Since the outdoor unit adopts all the technical solutions of the wind wheel of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment.

[0059] The air conditioner of the third embodiment of the utility model includes the outdoor unit of the second embodiment of the utility model.

[0060] Since the air conditioner adopts all the technical solutions of the outdoor unit of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment.

[0061] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A wind wheel having a rotation axis, characterized in that: include: Wheel hub; A plurality of blades connected to the peripheral wall of the hub and arranged at intervals along the circumference of the hub, the blades comprising a main body and a leading edge, the leading edge being located at the front end of the main body along the rotation direction of the wind wheel, the main body having a suction surface facing the wind inlet side of the wind wheel, and the leading edge being arranged protruding relative to the suction surface; The maximum outer diameter of the wind wheel is D, and the maximum axial dimension of the wind wheel along the direction of the rotation axis is L, which satisfies: 0.3≤L / D≤0.

41.

2. The wind wheel according to claim 1, characterized in that: The front edge portion is bent relative to the main body portion toward the wind outlet side of the wind wheel.

3. The wind wheel according to claim 2, characterized in that: The included angle between the front edge portion and the main body portion is θ, which satisfies: 30°≤θ≤45°.

4. The wind wheel according to any one of claims 1 to 3, characterized in that: The front edge portion is provided with a plurality of first recesses, which are located on a side of the front edge portion facing the air inlet side and are arranged at intervals along the length direction of the front edge portion.

5. The wind wheel according to claim 1, characterized in that: The blade further includes an outer edge portion, which is located at an end of the main body away from the hub, and the outer edge portion is convexly arranged relative to the suction surface.

6. The wind wheel according to claim 5, characterized in that: The outer edge portion is provided with a plurality of second recesses, and the plurality of second recesses are located on a side of the outer edge portion facing the air inlet side and are arranged at intervals along the length direction of the outer edge portion.

7. The wind wheel according to claim 1, characterized in that: The main body portion includes a plurality of reinforcing ribs, and the plurality of reinforcing ribs are located on one side of the suction surface and are arranged at intervals along the radial direction of the hub.

8. The wind wheel according to claim 1, characterized in that: The blade further includes a trailing edge portion, which is located at the rear end of the main body along the rotation direction of the wind wheel, and the trailing edge portion is convexly arranged relative to the suction surface.

9. The wind wheel according to claim 8, characterized in that: The trailing edge portion is provided with a plurality of sawtooth portions, and the plurality of sawtooth portions are located at one end of the trailing edge portion close to the wheel hub.

10. The wind wheel according to claim 1 or 8, characterized in that: The blade further includes a root portion, which is located at one end where the main body portion is connected to the hub, and a structure of the blade close to the root portion is arranged to protrude relative to the suction surface.

11. An outdoor unit, characterized in that: The invention comprises a wind wheel as claimed in any one of claims 1 to 10.

12. An air conditioner, characterized in that Comprising the outdoor unit as claimed in claim 11.

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