Axial flow wind wheel, axial flow fan and air supply equipment

Abstract

The utility model discloses an axial flow wind wheel, an axial flow fan and air supply equipment, and relates to the technical field of air supply equipment, and the axial flow wind wheel comprises a hub and blades; each blade is provided with a front edge, a tail edge, a blade root and a blade top, the front edge and the tail edge are oppositely arranged, the blade root and the blade top are oppositely arranged, the front edge, the blade top and the tail edge are sequentially connected to form the peripheral contour of the blade, and the blade root is connected with the hub; the front edge is provided with a first wave structure, and the tail edge is provided with a second wave structure; a projection plane perpendicular to the axis of the hub is defined as a first projection plane, a projection plane parallel to the axis of the hub is defined as a second projection plane, on the first projection plane, the projection of the front edge is arranged in a wave shape, the projection of the tail edge is arranged smoothly, and on the second projection plane, the projection of the front edge is arranged smoothly. According to the axial flow wind wheel, the operation efficiency of the axial flow wind wheel can be improved, and the working noise of the axial flow wind wheel can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of air supply equipment, and particularly relates to an axial flow impeller, an axial flow fan and an air supply equipment. Background Art

[0002] Axial flow fans are widely used in household electrical appliances. For example, most outdoor units of household air conditioners adopt axial flow fans. At present, in the air conditioning system, the requirements for the impeller efficiency and noise of the axial flow fan are getting higher and higher. The traditional axial flow impeller can no longer meet the latest air conditioning energy efficiency and noise requirements. There is an urgent need for an axial flow impeller with high efficiency and low noise to adapt to the new air conditioning system. Summary of the Utility Model

[0003] The main purpose of the utility model is to provide an axial flow impeller, an axial flow fan and an air supply equipment, aiming to improve the operation efficiency of the axial flow impeller and reduce the working noise of the axial flow impeller.

[0004] To achieve the above purpose, the axial flow impeller proposed by the utility model includes:

[0005] A hub; and

[0006] Blades, the blades have a leading edge and a trailing edge arranged oppositely, and a blade root and a blade tip arranged oppositely. The leading edge, the blade tip and the trailing edge are sequentially connected to form the outer peripheral contour of the blade. The blade root is connected to the hub. The leading edge has a first wave structure, and the trailing edge has a second wave structure;

[0007] Define the projection plane perpendicular to the axis of the hub as the first projection plane, and define the projection plane parallel to the axis of the hub as the second projection plane. In the first projection plane, the projection of the leading edge is arranged in a wave shape, and the projection of the trailing edge is arranged smoothly. In the second projection plane, the projection of the leading edge is arranged smoothly, and the projection of the trailing edge is arranged in a wave shape.

[0008] In an embodiment, the blade has a first blade part and a second blade part arranged sequentially along the radial direction of the axial flow impeller. The first blade part is located between the hub and the second blade part. The first wave structure and the second wave structure are arranged on the first blade part.

[0009] In an embodiment, in the first projection plane, with the center of the hub as the center point, define the radius of the blade tip as R, and define the radius of the first blade part as r1. The r1 is not greater than 0.7R.

[0010] In an embodiment, the first wave structure has at least two first grooves arranged in the extending direction of the leading edge. Each first groove is recessed towards the side close to the trailing edge to form a wave valley; and / or

[0011] The second wave structure has at least two second grooves arranged in the extending direction of the trailing edge, and each of the second grooves is recessed toward the side close to the leading edge to form a trough.

[0012] In one embodiment, each of the first grooves and the second grooves is arranged as an arc surface.

[0013] In one embodiment, on the first projection plane, the first blade part further has a first convex part connecting two adjacent first grooves, and the first convex part arches toward the side away from the trailing edge to form a peak; and / or

[0014] On the second projection plane, the first blade part further has a second convex part connecting two adjacent second grooves, and the second convex part arches toward the side away from the leading edge to form a peak.

[0015] In one embodiment, the number of the blades is not less than two and not more than five.

[0016] The present utility model further provides an axial flow fan, which includes a motor and the axial flow impeller as described above. The motor is drivingly connected to the axial flow impeller, and the motor is used to drive the axial flow impeller to rotate.

[0017] The present utility model further provides an air supply device, which includes the axial flow impeller as described above, or includes the axial flow fan as described above.

[0018] In one embodiment, the air supply device is an air conditioner, and the axial flow impeller is arranged in the outdoor unit and / or the indoor unit of the air conditioner.

[0019] The technical solution of the present utility model optimizes the design of the blades of the axial-flow wind wheel, so that the leading edge of the blade has a first wave structure and the trailing edge of the blade has a second wave structure, which can respectively rectify the incoming flow and the outgoing flow of the blade. On the one hand, when the blade rotates, the first wave structure and the second wave structure can increase the adhesion of the air flow on the blade surface, reduce the formation of the separation zone, maintain the adhesion of the air flow within a larger range of attack angles, reduce the occurrence of delayed stall phenomenon, and make the air flow more evenly distributed on the blade surface, which helps to reduce local high-pressure and low-pressure areas, reduce energy loss, thereby improving the aerodynamic efficiency. At the same time, it helps to form a stable boundary layer on the blade surface and delay the occurrence of air flow separation, thereby increasing the lift of the blade and realizing the improvement of the operating efficiency of the axial-flow wind wheel. On the other hand, the first wave structure and the second wave structure can reduce the turbulence and eddy currents caused by the air flow on the blade surface, the disturbance of the air flow is small, and the generated noise is relatively low. Therefore, it can reduce the working noise during the operation of the blade. Moreover, the wave structure can disperse the vibration energy, reduce the possibility of resonance, help to reduce blade vibration, and reduce the noise generated by blade vibration, thereby achieving the effect of reducing the operating noise of the axial-flow wind wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0021] Figure 1 It is a schematic exploded view of an embodiment of an outdoor unit of an air conditioner provided by the present utility model;

[0022] Figure 2 It is a schematic structural view of an embodiment of an axial-flow wind wheel provided by the present utility model;

[0023] Figure 3 It is Figure 1 a schematic projection view of the axial-flow wind wheel on the first projection plane;

[0024] Figure 4 It is Figure 1 a schematic projection view of the axial-flow wind wheel on the second projection plane;

[0025] Figure 5 It is Figure 1 a schematic view of the axial-flow wind wheel from another angle;

[0026] Figure 6 It is Figure 1 a schematic view of the axial-flow wind wheel from another angle;

[0027] Figure 7 It is a comparison chart of air volume - power between an existing wind wheel and an axial - flow wind wheel according to an embodiment of the present utility model;

[0028] Figure 8 It is a comparison chart of air volume - noise between an existing wind wheel and an axial - flow wind wheel according to an embodiment of the present utility model.

[0029] Explanation of the reference numerals in the drawings:

[0030] 100. Axial - flow wind wheel; 10. Hub; 20. Blade; 201. Leading edge; 2011. First groove; 2012. First convex part; 202. Trailing edge; 2021. Second groove; 2022. Second convex part; 203. Tip of the blade; 204. Root of the blade; O. Center point;

[0031] 200. Motor; 300. Heat exchanger; 400. Air - outlet panel; 500. Mesh cover.

[0032] The realization, functional features and advantages of the purpose of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0033] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0034] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0035] In addition, if the descriptions such as "first" and "second" are involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0036] Axial flow fans have a wide range of applications in household electrical appliances. For example, most outdoor units of household air conditioners use axial flow fans. At present, in the air conditioning system, the requirements for the impeller efficiency and noise of axial flow fans are getting higher and higher, and traditional axial flow impellers can no longer meet the latest air conditioning energy efficiency and noise requirements. There is an urgent need for a high-efficiency and low-noise axial flow impeller to adapt to the new air conditioning system.

[0037] The present utility model proposes an axial flow impeller 100. By optimizing the design of the structure of the axial flow impeller 100, the fan efficiency can be improved, and the power and noise can be reduced under the condition of achieving the same air volume.

[0038] The axial flow impeller 100 or the axial flow fan having the axial flow impeller 100 can also be applied to air supply devices, where the air supply devices include but are not limited to air conditioners, fans, air purifiers, dehumidifiers, humidifiers, etc. When the air supply device is an air conditioner, the axial flow impeller 100 can be arranged in the outdoor unit and / or the indoor unit of the air conditioner.

[0039] Taking the application of the axial flow impeller 100 in the outdoor unit of an air conditioner as an example, as Figure 1As shown, in one embodiment, the outdoor unit of an air conditioner includes a housing, and an axial flow impeller 100, a motor 200, and a heat exchanger 300 disposed within the housing. The housing has an air inlet and an air outlet. The heat exchanger 300 is disposed opposite to the air inlet. The axial flow impeller 100 is disposed between the heat exchanger 300 and the air outlet. The axial flow impeller 100 is drivingly connected to the motor 200. When the outdoor unit of the air conditioner operates, the motor 200 drives the axial flow impeller 100 to rotate, capable of sucking external air into the housing through the air inlet, exchanging heat with the heat exchanger 300, and then sending it out from the air outlet. Optionally, the housing has an air outlet panel 400 located at the front side. The air outlet panel 400 is provided with an air outlet, and a grille 500 is provided at the air outlet to prevent foreign objects from entering the interior of the outdoor unit of the air conditioner. By adopting the axial flow impeller 100 of the present utility model, it is possible to reduce the noise and power of the outdoor unit of the air conditioner while achieving the same air volume, so that it can meet the latest air conditioner energy efficiency and noise requirements. The following mainly gives examples of the implementation manners of the axial flow impeller 100.

[0040] Please refer to Figures 2 to 6 , in one embodiment of the present utility model, the axial flow impeller 100 includes a hub 10 and blades 20; the blades 20 have a leading edge 201 and a trailing edge 202 which are oppositely disposed, and a blade root 204 and a blade tip 203 which are oppositely disposed. The leading edge 201, the blade tip 203, and the trailing edge 202 are sequentially connected to form the outer peripheral contour of the blade 20. The blade root 204 is connected to the hub 10; the leading edge 201 has a first wave structure, and the trailing edge 202 has a second wave structure.

[0041] It can be understood that the axial flow impeller 100 includes a hub 10 and blades 20 disposed on the outer periphery of the hub 10. Among them, the number of blades 20 is generally two, for example, it can be set to two, three, four, five or more. Optionally, the number of blades 20 is not less than two and not more than five. Exemplarily, three blades 20 are circumferentially spaced and evenly disposed on the hub 10. The shapes and thicknesses of the respective blades 20 are substantially the same to ensure the stability when the axial flow impeller 100 rotates. Taking a single blade 20 as an example, the blade root 204, the leading edge 201, the blade tip 203, and the trailing edge 202 of the blade 20 are sequentially connected end to end to enclose and form the outer peripheral contour of the blade 20. Among them, the blade root 204 is used to connect to the hub 10, and the blade tip 203 is located on the side away from the hub 10 of the blade root 204 to form the free end of the blade 20. In the oncoming flow direction, the leading edge 201 is located on the upstream side of the blade 20, and the trailing edge 202 is located on the downstream side of the blade 20. The axial flow impeller 100 is driven to rotate by the motor 200. Air flows into the blade 20 from the leading edge 201, obtains a pressure rise by the work of the blade 20, and then flows out from the trailing edge 202 of the blade 20, thereby realizing the air supply function.

[0042] Among them, the first wavy structure located at the leading edge 201 refers to a shape with undulating and uneven structural features, which can be either a regular wavy shape with regular geometric forms (such as sine wave, cosine wave, sawtooth wave, etc.) or an irregular wavy shape. The second wavy structure located at the trailing edge 202 can also be set in the same form as the first wavy structure, which will not be elaborated here.

[0043] As Figure 3 , Figure 4 shown, in an embodiment, a projection plane perpendicular to the axis of the hub 10 is defined as the first projection plane, and a projection plane parallel to the axis of the hub 10 is defined as the second projection plane. In the first projection plane, the projection of the leading edge 201 is arranged in a wavy shape, and the projection of the trailing edge 202 is arranged smoothly. In the second projection plane, the projection of the leading edge 201 is arranged smoothly, and the projection of the trailing edge 202 is arranged in a wavy shape.

[0044] Among them, the projection plane perpendicular to the axis of the hub 10 is also the projection plane formed by the projection of the axial flow wind wheel 100 on a plane perpendicular to the axis of the hub 10. The projection plane parallel to the axis of the hub 10 is also the projection plane formed by the projection of the axial flow wind wheel 100 on a plane parallel to the axis of the hub 10.

[0045] In this embodiment, since the blade 20 has a certain degree of twist in its length direction, on the one hand, the angle between the position of the blade 20 close to the leading edge 201 and the first projection plane is smaller, and the angle between the position of the blade 20 close to the trailing edge 202 and the first projection plane is larger. When in the first projection plane, the projection of the leading edge 201 is arranged in a wavy shape and the projection of the trailing edge 202 is arranged smoothly, it can be seen that the second wavy structure located at the trailing edge 202 will not appear when projected on the first projection plane, so that the depth of the wave valley of the second wavy structure located at the trailing edge 202 will not be too deep, and the second wavy structure will not overly occupy the area of the blade 20. On the other hand, the angle between the position of the blade 20 close to the leading edge 201 and the second projection plane is larger, and the angle between the position of the blade 20 close to the trailing edge 202 and the second projection plane is smaller. In the second projection plane, the projection of the trailing edge 202 is arranged in a wavy shape and the projection of the leading edge 201 is arranged smoothly, it can be seen that the depth of the wave valley of the first wavy structure will not be too deep, and the first wavy structure will not overly occupy the area of the blade 20.

[0046] The technical solution of the present utility model optimizes the design of the blades 20 of the axial-flow impeller 100, so that the leading edge 201 of the blade 20 has a first wave structure, and the trailing edge 202 of the blade 20 has a second wave structure, which can respectively rectify the incoming flow and the outgoing flow of the blade 20. On the one hand, when the blade 20 rotates, the first wave structure and the second wave structure can increase the adhesion of the air flow on the surface of the blade 20, reduce the formation of the separation zone, maintain the adhesion of the air flow within a large range of attack angles, reduce the occurrence of delayed stall phenomenon, and make the air flow more evenly distributed on the surface of the blade 20, which helps to reduce local high-pressure and low-pressure areas, reduce energy loss, thereby improving the aerodynamic efficiency. At the same time, it helps to form a stable boundary layer on the surface of the blade 20, delay the occurrence of air flow separation, thereby increasing the lift of the blade, and realizing the function of improving the operating efficiency of the axial-flow impeller 100. On the other hand, the first wave structure and the second wave structure can reduce the turbulence and eddy current caused by the air flow on the surface of the blade 20, the disturbance of the air flow is small, and the generated noise is relatively low. Therefore, it can reduce the working noise when the blade 20 rotates. Moreover, the wave structure can disperse the vibration energy, reduce the possibility of resonance, help to reduce the vibration of the blade 20, and reduce the noise generated by the vibration of the blade 20, thereby reducing the operating noise of the axial-flow impeller 100. And the setting depths of the first wave structure and the second wave structure on the blade 20 are relatively shallow, which will not overly occupy the area of the blade 20, and the settings of the first wave structure and the second wave structure will not affect the work efficiency of the fan blade.

[0047] As Figure 3 , Figure 4 shown, in an embodiment, the blade 20 has a first blade part 21 and a second blade part 22 arranged in sequence along the radial direction of the axial-flow impeller 100. The first blade part 21 is located between the hub 10 and the second blade part 22, and the first wave structure and the second wave structure are arranged on the first blade part 21.

[0048] With such a setting, the first wave structure and the second wave structure are closer to the root 204 position of the blade 20, so that they can be closer to the main area where the blade 20 is subjected to aerodynamic loads (the root of the blade 20 is the main area where the blade 20 is subjected to aerodynamic loads), so that the first wave structure and the second wave structure can guide the air flow at the initial position where the air flow enters the blade 20, making the rectification effect on the air flow better. Secondly, the first wave structure and the second wave structure are only distributed on the first blade part 21, so that the settings of the first wave structure and the second wave structure will not cause the blade 20 to lose too much area, which is beneficial to the blade 20 to maintain sufficient structural strength and ensure that the blade 20 has sufficient work efficiency.

[0049] Refer to Figure 3 , Figure 4As shown, on the first projection plane, with the center point O of the hub 10 as the center, the radius of the blade tip 203 is defined as R, and the radius of the first blade part 21 is defined as r1, where r1 is not greater than 0.7R.

[0050] In this embodiment, the radius R of the axial flow wind wheel 100 refers to the straight-line distance from the center point O of the hub 10 to the outermost edge of the blade tip 203 in the radial direction of the hub 10. The radius of the first blade part 21 is r1, where r1 is not greater than 0.7R. With such a setting, the length of the first blade part 21 is moderate, neither too long nor too short, so that the leading edge 201 and the trailing edge 202 of the blade 20 can form a wavy concave area with a certain area, achieving an effective rectification effect and improving the efficiency of the fan; at the same time, it can ensure that the area of the blade tip 203 is not affected, so as to ensure the structural strength and work efficiency of the blade 20. It can be understood that the first blade part 21 is located between the hub 10 and the second blade part 22, so r1 should also be greater than the radius r of the hub 10. That is, r < r1 ≤ 0.7R. Exemplarily, r1 can be 0.1R, 0.2R, 0.3R, 0.4R, 0.5R, 0.6R, 0.7R, etc.

[0051] As Figure 3 , Figure 4 shown, in one embodiment, the first wave structure has at least two first grooves 2011 arranged in the extending direction of the leading edge 201, and each first groove 2011 is recessed toward the side close to the trailing edge 202 to form a wave trough; and / or

[0052] the second wave structure has at least two second grooves 2021 arranged in the extending direction of the trailing edge 202, and each second groove 2021 is recessed toward the side close to the leading edge 201 to form a wave trough.

[0053] In this way, the lengths of the first wave structure and the second wave structure are designed more reasonably. The first wave structure and the second wave structure have sufficient lengths to achieve the rectification of air inflow and air outflow. At the same time, the lengths of the first wave structure and the second wave structure are not too long, so as not to overly occupy the area of the blade 20, thereby reducing the influence of the first wave structure and the second wave structure on the structural strength and work efficiency of the blade 20.

[0054] Optionally, each of the first grooves 2011 and the second grooves 2021 is arranged as an arc surface. In this way, the first grooves 2011 and the second grooves 2021 are smoother, which is beneficial to reducing resistance, reducing the fluctuation and instability of the air flow, and achieving a better noise reduction effect.

[0055] In one embodiment, as Figure 3 , Figure 4As shown, on the first projection plane, the first blade part 21 further has a first convex part 2012 connecting two adjacent first grooves 2011, and the first convex part 2012 arches towards the side away from the trailing edge 202 to form a wave crest; and / or

[0056] On the second projection plane, the first blade part 21 further has a second convex part 2022 connecting two adjacent second grooves 2021, and the second convex part 2022 arches towards the side away from the leading edge 201 to form a wave crest.

[0057] The adjacent first grooves 2011 are connected by the first convex part 2012, so that the adjacent first grooves 2011 can be smoothly transitioned through the first convex part 2012; and / or, the adjacent second grooves 2021 are connected by the second convex part 2022, so that the adjacent second grooves 2021 can be smoothly transitioned through the second convex part 2022, thereby helping to reduce the resistance when air flows into and / or out of the blade 20, reducing the fluctuation and instability of the air flow, and achieving a better noise reduction effect.

[0058] An existing wind turbine (i.e., a wind turbine with a smooth leading edge) is experimentally compared with the axial flow wind turbine 100 provided in an embodiment of the present invention (hereinafter referred to as the wind turbine with leading edge waves and trailing edge waves in this solution), and the obtained Figure 7 wind volume-power comparison diagram is as shown, and the Figure 8 wind volume-noise comparison diagram is as shown. It can be seen from Figure 7 that under the same wind volume, the power of the wind turbine with leading edge waves and trailing edge waves provided in this solution is less than that of the existing wind turbine, and it can achieve a good power reduction effect. It can be seen from Figure 8 that under the same wind volume, the noise of the wind turbine with leading edge waves and trailing edge waves provided in this solution is less than that of the existing wind turbine, and it can achieve a good noise reduction effect.

[0059] The present invention also proposes an axial flow fan, which includes a motor 200 and an axial flow wind turbine 100. The specific structure of the axial flow wind turbine 100 refers to the above embodiment. Since this air conditioner outdoor unit adopts all the technical solutions of the above all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated one by one here.

[0060] In this embodiment, the output shaft of the motor 200 is drivingly connected to the hub 10. The axial flow wind turbine 100 is driven to rotate by the motor 200. Air flows into the blade 20 from the leading edge 201, and after obtaining a pressure rise by the work of the blade 20, it flows out from the trailing edge 202 of the blade 20, thereby realizing the air supply function. And through the design of the above axial flow wind turbine 100, the anti-static pressure ability of the axial flow wind turbine 100 is improved, and the air output of the axial flow fan can be increased under the same ambient static pressure.

[0061] The present utility model further provides an air supply device, which includes an axial flow impeller 100 or an axial flow fan having the axial flow impeller 100. The specific structure of the axial flow impeller 100 refers to the above-mentioned embodiments. Since this air supply device adopts all the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated here one by one. Among them, the air supply device includes, but is not limited to, air conditioners, fans, air purifiers, dehumidifiers, humidifiers, etc.

[0062] In one embodiment, the air supply device is an air conditioner, and the axial flow impeller 100 is arranged in the outdoor unit and / or the indoor unit of the air conditioner.

[0063] The above is only an exemplary embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. An axial flow wind wheel, characterized in that, Comprising: A hub; And Blades, the blades having a leading edge and a trailing edge disposed opposite to each other, and a blade root and a blade tip disposed opposite to each other, the leading edge, the blade tip and the trailing edge being sequentially connected to form the outer peripheral contour of the blade, the blade root being connected to the hub, the leading edge having a first wave structure, and the trailing edge having a second wave structure; Defining the projection plane perpendicular to the axis of the hub as the first projection plane, and defining the projection plane parallel to the axis of the hub as the second projection plane. In the first projection plane, the projection of the leading edge is arranged in a wave shape, and the projection of the trailing edge is arranged smoothly. In the second projection plane, the projection of the leading edge is arranged smoothly, and the projection of the trailing edge is arranged in a wave shape.

2. The axial flow wind wheel according to claim 1, characterized in that, The blade has a first blade part and a second blade part arranged sequentially in the radial direction of the axial flow wind turbine. The first blade part is located between the hub and the second blade part. The first wave structure and the second wave structure are provided on the first blade part.

3. The axial flow wind wheel according to claim 2, characterized in that, In the first projection plane, with the center of the hub as the center point, defining the radius of the blade tip as R, and defining the radius of the first blade part as r1, and the r1 is not greater than 0.7R.

4. The axial-flow wind wheel according to claim 2, characterized in that, The first wave structure has at least two first grooves arranged in the extending direction of the leading edge, and each of the first grooves is recessed toward the side close to the trailing edge to form a wave valley; and / or The second wave structure has at least two second grooves arranged in the extending direction of the trailing edge, and each of the second grooves is recessed toward the side close to the leading edge to form a wave valley.

5. The axial flow wind wheel according to claim 4, wherein Each of the first grooves and the second grooves is arranged in an arc surface.

6. The axial flow wind wheel according to claim 4, wherein In the first projection plane, the first blade part further has a first convex part connecting two adjacent first grooves, and the first convex part arches toward the side away from the trailing edge to form a wave peak; and / or In the second projection plane, the first blade part further has a second convex part connecting two adjacent second grooves, and the second convex part arches toward the side away from the leading edge to form a wave peak.

7. The axial flow wind wheel according to any one of claims 1 to 6, characterized in that, The number of the blades is not less than two and not more than five.

8. An axial flow fan, characterized in that, Comprising a motor and an axial flow wind turbine according to any one of claims 1 to 7, the motor being drivingly connected to the axial flow wind turbine, and the motor being used to drive the axial flow wind turbine to rotate.

9. An air supply device, characterized in that, Comprising an axial flow wind turbine according to any one of claims 1 to 7, or comprising an axial flow fan according to claim 8.

10. The air supply device according to claim 9, wherein, The air supply device is an air conditioner, and the axial flow wind turbine is arranged in the air conditioner outdoor unit and / or the air conditioner indoor unit of the air conditioner.

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