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 wind wheels. The blade root is connected with the hub, the blade top is arranged opposite to the blade root, and the front edge and the tail edge are arranged at the two ends of the blade root respectively. On a projection plane perpendicular to the axis of the hub, a straight line connecting the center point of the hub and the front edge point of the blade root serves as a datum line, the datum line is provided with a first intersection point intersecting with the front edge, the first intersection point is located between the front edge point of the blade root and the front edge point of the blade top, and the front edge is provided with a first front edge section connecting the front edge point of the blade root and the first intersection point. The first front edge section is sunken towards the side close to the tail edge relative to the datum line so as to define a sunken area with the datum line, and at least part of the first front edge section is arranged in a wave shape. According to the technical scheme provided by the utility model, the noise and the power of the axial flow wind wheel can be reduced under the condition of realizing the same air volume.

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 of the outdoor units of household air conditioners adopt axial flow fans. When the axial flow impeller of a traditional axial flow fan rotates at a high speed, flow separation will occur, which affects the efficiency of the fan and generates relatively large fan noise. Moreover, in the air conditioning system, the requirements for the efficiency and noise of the impeller 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 a high-efficiency and low-noise axial flow impeller to adapt to the new air conditioning system. Summary of the Utility Model

[0003] The main object of the utility model is to provide an axial flow impeller, an axial flow fan and an air supply equipment, aiming to improve the efficiency of the fan and reduce the power and noise under the condition of achieving the same air volume.

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

[0005] A hub; and

[0006] Blades, the blades having a blade root connected to the hub, a blade tip opposite to the blade root, and a leading edge and a trailing edge respectively provided at both ends of the blade root;

[0007] On the projection plane perpendicular to the axis of the hub, the straight line connecting the center point of the hub and the leading edge point of the blade root is used as a reference line. The reference line has a first intersection point intersecting with the leading edge. The first intersection point is located between the leading edge point of the blade root and the leading edge point of the blade tip. The leading edge has a first leading edge section connecting the leading edge point of the blade root and the first intersection point. The first leading edge section is recessed towards the side close to the trailing edge relative to the reference line to enclose a recessed area with the reference line. The first leading edge section is at least partially arranged in a wavy shape.

[0008] In an embodiment, the first leading edge section has at least two concave surfaces arranged along its extending direction, and each of the concave surfaces is recessed towards the side close to the trailing edge to form a wave trough.

[0009] In an embodiment, each of the concave surfaces is arranged as an arc surface.

[0010] In an embodiment, the at least two concave surfaces include a first concave surface and a second concave surface. The straight line connecting the lowest point of the first concave surface and the lowest point of the second concave surface is defined as a first straight line, and the first straight line intersects with the center point of the hub.

[0011] In one embodiment, a first included angle is formed between the first straight line and the reference line, and the first included angle is not less than 5 degrees and not more than 20 degrees.

[0012] In one embodiment, the first leading edge segment further has a convex surface connected between the first concave surface and the second concave surface, and the convex surface arches to form a wave crest on the side away from the trailing edge.

[0013] In one embodiment, the straight line connecting the highest point of the convex surface and the center point of the hub is defined as the second straight line, and a second included angle is formed between the second straight line and the reference line, and the second included angle is not less than 0 degrees and not more than 20 degrees.

[0014] In one embodiment, in the projection plane perpendicular to the axis of the hub, the radius of the axial flow wind wheel is defined as R, and the linear distance between the first intersection point and the center point of the hub is r1, where r1 is not greater than 0.7R.

[0015] The present utility model also provides an axial flow fan, which includes a motor and the axial flow wind wheel as described above. The motor is drivingly connected to the axial flow wind wheel, and the motor is used to drive the axial flow wind wheel to rotate.

[0016] The present utility model also provides an air supply device, which includes the axial flow wind wheel or the axial flow fan as described above.

[0017] In one embodiment, the air supply device is an air conditioner, and the axial flow wind wheel is disposed in the outdoor unit and / or the indoor unit of the air conditioner.

[0018] The technical solution of the present utility model optimizes the design of the blade structure of the axial-flow wind wheel, so that a concave area is formed at the leading edge of the blade, and at least part of the first leading edge section corresponding to the concave area is arranged in a wavy shape, so that the leading edge of the blade has a wavy structural feature. Through the structural design of the wavy leading edge, on the one hand, the wavy leading edge can generate a series of small eddies on the blade surface. These eddies help to enhance the attachment of the air flow, reduce the formation of the separation zone, and can maintain the attachment of the air flow within a large range of attack angles, delaying the occurrence of stall; on the other hand, the eddy structure of the wavy leading edge can also effectively reduce the pressure gradient on the blade surface, reduce turbulence and separation phenomena, and thus reduce resistance; on the third hand, by optimizing the leading edge shape, the structural design of the wavy leading edge can generate higher lift within a large range of attack angles, increase the lift coefficient of the blade, and help improve the overall efficiency of the wind wheel; on the fourth hand, the structural design of the wavy leading edge can generate a stable eddy structure on the blade surface, reduce the fluctuation and instability of the air flow, thereby improving the aerodynamic stability of the wind wheel and reducing the vibration and noise of the blade under different wind speeds and wind directions; in addition, the structural design of the wavy leading edge can also optimize the flow distribution on the blade surface, make the air flow more evenly distributed on the blade surface, and the uniform flow distribution helps to reduce local high-pressure and low-pressure areas, reduce energy loss, and thus improve the aerodynamic efficiency of the wind wheel. That is to say, through the wavy structural design of the blade leading edge of this solution, it can play multiple roles such as delaying stall, reducing resistance, increasing lift, improving aerodynamic stability, and optimizing flow distribution. The axial-flow wind wheel designed by this solution can improve the efficiency of the fan and reduce power and noise under the condition of achieving the same air volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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 use in 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 also be obtained based on the structures shown in these drawings.

[0020] 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;

[0021] Figure 2 It is a schematic structural view of an embodiment of an axial-flow wind wheel provided by the present utility model;

[0022] Figure 3 is Figure 1 a schematic structural view of the axial-flow wind wheel from another perspective;

[0023] Figure 4 is Figure 1Structural schematic diagram of the axial flow impeller from another perspective;

[0024] Figure 5 It is a comparison chart of air volume - power between an existing impeller and the axial flow impeller of an embodiment of the present utility model.

[0025] Explanation of the reference numerals in the attached drawings:

[0026] 100. Axial flow impeller; 10. Hub; 20. Blade; 21. Blade root; 22. Blade tip; 23. Leading edge; 231. First leading edge segment; 232. Second leading edge segment; 231a. First concave surface; 231b. Second concave surface; 231c. Convex surface; 24. Trailing edge; A. Leading edge point of the blade root; B. Lowest point of the first concave surface; C. Highest point of the convex surface; D. Lowest point of the second concave surface; E. First intersection point; L0. Reference line; L1. First straight line; L2. Second straight line;

[0027] 200. Motor; 300. Heat exchanger; 400. Air outlet panel; 500. Mesh cover.

[0028] The realization of the purpose, functional features and advantages of the present utility model will be further described with reference to the embodiments and the attached drawings. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the attached 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 shall fall within the protection scope of the present utility model.

[0030] 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 position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0031] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying 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 the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. 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.

[0032] Axial fans have extensive applications in household electrical appliances. For example, most of the outdoor units of household air conditioners use axial fans. When the traditional axial fan's axial impeller rotates at high speed, flow separation will occur, affecting the fan efficiency and generating relatively large fan noise. Moreover, in the air conditioning system, the requirements for the impeller efficiency and noise are getting higher and higher. The traditional axial impeller 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 impeller to adapt to the new air conditioning system.

[0033] The present utility model provides an axial impeller 100. By optimizing the design of the structure of the axial 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.

[0034] The axial impeller 100 or the axial fan having the axial impeller 100 can also be applied to air supply devices. Among them, 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 impeller 100 can be arranged in the outdoor unit and / or the indoor unit of the air conditioner.

[0035] Taking the application of the axial impeller 100 in the outdoor unit of an air conditioner as an example, as Figure 1As shown, in one embodiment, an outdoor unit of an air conditioner includes a housing, and an axial flow fan 100, a motor 200, and a heat exchanger 300 disposed inside the housing. The housing has an air inlet and an air outlet. The heat exchanger 300 is disposed opposite to the air inlet, and the axial flow fan 100 is disposed between the heat exchanger 300 and the air outlet. The axial flow fan 100 is drivingly connected to the motor 200. When the outdoor unit of the air conditioner operates, the motor 200 drives the axial flow fan 100 to rotate, so that external air can be sucked into the housing through the air inlet, exchanged heat with the heat exchanger 300, and then sent out through the air outlet. Optionally, the housing has an air outlet panel 400 located on 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 fan 100 of the present utility model, the noise and power of the outdoor unit of the air conditioner can be reduced 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 fan 100.

[0036] Please refer to Figure 2 and Figure 3 , in one embodiment of the present utility model, the axial flow fan 100 includes a hub 10 and blades 20. The blade 20 has a blade root 21 and a blade tip 22 disposed opposite to each other, and a leading edge 23 and a trailing edge 24 disposed opposite to each other. The leading edge 23 and the trailing edge 24 are respectively disposed at both ends of the blade root 21 and the blade tip 22. The blade root 21, the leading edge 23, the blade tip 22, and the trailing edge 24 are sequentially connected end to end to form the outer peripheral contour of the blade 20. The blade root 21 is connected to the hub 10. On a projection plane perpendicular to the axis of the hub 10, a straight line connecting the center point O of the hub 10 and the leading edge point A of the blade root 21 is used as a reference line L0. The reference line L0 has a first intersection point E that intersects with the leading edge 23. The first intersection point E is located between the leading edge point A of the blade root and the leading edge point of the blade tip 22. The leading edge 23 has a first leading edge segment 231 connecting the leading edge point A of the blade root 21 and the first intersection point E. The first leading edge segment 231 is recessed toward the side close to the trailing edge 24 relative to the reference line L0 to enclose a recessed area with the reference line L0. The first leading edge segment 231 is at least partially arranged in a wavy shape.

[0037] It can be understood that the axial flow impeller 100 includes a hub 10 and blades 20 provided on the outer periphery of the hub 10. Among them, the number of blades 20 is generally at least two, for example, it can be 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 arranged on the hub 10, and the shapes and thicknesses of the respective blades 20 are substantially the same to ensure the stability of the axial flow impeller 100 during rotation. Taking a single blade 20 as an example, the blade root 21, leading edge 23, blade tip 22 and trailing edge 24 of the blade 20 are sequentially connected end to end to enclose the outer peripheral contour of the blade 20. Among them, the blade root 21 is used to connect the hub 10, and the blade tip 22 is located on the side of the blade root 21 away from the hub 10 to form the free end of the blade 20. In the oncoming flow direction, the leading edge 23 is located on the oncoming flow side of the blade 20, and the trailing edge 24 is located on the outflow side of the blade 20. The axial flow impeller 100 is driven to rotate by the motor 200, and air flows into the blade 20 from the leading edge 23, and after obtaining a pressure rise by the work of the blade 20, it flows out from the trailing edge 24 of the blade 20, thereby realizing the air supply function. The projection plane perpendicular to the axis of the hub 10, that is, the projection plane formed by the projection of the axial flow impeller 100 on the plane perpendicular to the axis of the hub 10.

[0038] In this embodiment, on the projection plane perpendicular to the axis of the hub 10, the straight line obtained by extending the line segment connecting the center point O of the hub 10 and the leading edge point A of the blade root 21 is the reference line L0. Among them, the center point O of the hub 10 is also the rotation center of the axial flow impeller 100, the leading edge point A of the blade root 21 is also the intersection point of the blade root 21 and the leading edge 23, and the leading edge point of the blade tip 22 is also the intersection point of the blade tip 22 and the leading edge 23. The intersection point of the reference line L0 and the leading edge 23 is the first intersection point E, and the first intersection point E is located between the leading edge point A of the blade root 21 and the leading edge point of the blade tip 22. The leading edge 23 can be divided into a first leading edge segment 231 and a second leading edge segment 232 through the first intersection point E. Among them, the first leading edge segment 231 connects the leading edge point A of the blade root 21 and the first intersection point E, and the second leading edge segment 232 connects the first intersection point E and the leading edge point of the blade tip 22. The first leading edge segment 231 is located on the side of the reference line L0 close to the trailing edge 24 of the blade 20. The first leading edge segment 231 is recessed toward the side close to the trailing edge 24 relative to the reference line L0, so that a recessed area is enclosed between the first leading edge segment 231 and the reference line L0, and at least part of the first leading edge segment 231 is arranged in a wavy shape. It should be noted that the wavy shape here refers to a shape with undulating and uneven structural characteristics, 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.

[0039] The technical solution of the present utility model optimizes the design of the blade 20 structure of the axial flow impeller 100, so that a concave area is formed at the leading edge 23 of the blade 20, and at least a part of the first leading edge section 231 corresponding to the concave area is arranged in a wavy shape, so that the leading edge 23 of the blade 20 has a wavy structural feature. Through the structural design of the wavy leading edge 23, on the one hand, the wavy leading edge 23 can generate a series of small eddies on the surface of the blade 20. These eddies help to enhance the attachment of the air flow, reduce the formation of the separation zone, can maintain the attachment of the air flow within a large range of attack angles, and delay the occurrence of stall; on the other hand, the eddy structure of the wavy leading edge 23 can also effectively reduce the pressure gradient on the surface of the blade 20, reduce turbulence and separation phenomena, and thus reduce resistance; on the other hand, by optimizing the shape of the leading edge 23, the structural design of the wavy leading edge 23 can generate higher lift within a large range of attack angles, can increase the lift coefficient of the blade 20, and helps to improve the overall efficiency of the impeller; on the other hand, the structural design of the wavy leading edge 23 can generate a stable eddy structure on the surface of the blade 20, reduce the fluctuation and instability of the air flow, thereby improving the aerodynamic stability of the impeller and reducing the vibration and noise of the blade 20 under different wind speed and wind direction conditions; in addition, the structural design of the wavy leading edge 23 can also optimize the flow distribution on the surface of the blade 20, make the air flow more evenly distributed on the surface of the blade 20, and the uniform flow distribution helps to reduce local high-pressure and low-pressure areas, reduce energy loss, and thus improve the aerodynamic efficiency of the impeller. That is to say, through the wavy structural design of the leading edge 23 of the blade 20 in this solution, it can play multiple roles such as delaying stall, reducing resistance, increasing lift, improving aerodynamic stability, and optimizing flow distribution. The axial flow impeller 100 designed by this solution can improve the efficiency of the fan, and can reduce power and noise under the condition of achieving the same air volume.

[0040] In an embodiment, the first leading edge section 231 has at least two concave surfaces arranged along its extending direction, and each of the concave surfaces is recessed towards the trailing edge 24 to form a trough. Among them, the number of concave surfaces can be two, three, four or more, and no specific limitation is made here. By setting multiple concave surfaces, a series of small eddies can be generated on the surface of the blade 20. These eddies help to enhance the attachment of the air flow, reduce the formation of the separation zone, can further improve the rectification effect, improve the fan efficiency, and reduce power and noise.

[0041] Compare the existing impeller (that is, the impeller with a smooth leading edge) with the axial flow impeller 100 provided in an embodiment of the present utility model (hereinafter referred to as the impeller with a wavy leading edge in this solution), and obtain the Figure 5 as shown in the air volume-power comparison diagram. From Figure 5It can be seen that under the condition of the same air volume, the power of the wind wheel with a wavy leading edge provided by this solution is less than that of the existing wind wheel, which can achieve a good effect of reducing power.

[0042] Optionally, each of the concave surfaces is arranged as an arc surface. In this way, the concave surface is smoother, which is beneficial to reducing resistance, reducing the fluctuation and instability of the air flow, and achieving a better noise reduction effect.

[0043] As Figure 3 and Figure 4 shown, in an embodiment, the at least two concave surfaces include a first concave surface 231a and a second concave surface 231b. A straight line connecting the lowest point B of the first concave surface 231a and the lowest point D of the second concave surface 231b is defined as a first straight line L1, and the first straight line L1 intersects the center point O of the hub 10.

[0044] In this embodiment, the lowest point B of the first concave surface 231a refers to the point on the projection line formed by the first concave surface 231a on the projection plane perpendicular to the axis of the hub 10 that is farthest from the reference line L0. The lowest point D of the second concave surface 231b refers to the point on the projection line formed by the second concave surface 231b on the projection plane perpendicular to the axis of the hub 10 that is farthest from the reference line L0. The center point O of the hub 10, the lowest point B of the first concave surface 231a, and the lowest point D of the second concave surface 231b are on the same straight line. In this way, the relative position design between the first concave surface 231a and the second concave surface 231b is more reasonable, so that a more effective rectifying effect can be achieved, further improving the fan efficiency, reducing power and noise.

[0045] As Figure 4 shown, in an embodiment, a first included angle is formed between the first straight line L1 and the reference line L0, and the first included angle is not less than 5 degrees and not greater than 20 degrees.

[0046] In this embodiment, the first included angle is ∠AOB. If the angle of the first included angle is too small, the depression degree of the concave surface is small, and the rectifying effect is limited; if the angle of the first included angle is too large, the depression degree of the concave surface is large, resulting in too large an area of the depressed area at the leading edge 23, which will excessively reduce the area of the blade 20, thus affecting the structural strength and work efficiency of the blade 20. By reasonably designing the angle of the first included angle and limiting it between 5 degrees and 20 degrees, that is, 5°≤∠AOB≤20°, the area of the depressed area at the leading edge 23 of the blade 20 is moderate, achieving an effective rectifying effect while not excessively losing the area of the blade 20 to ensure the structural strength and work efficiency of the blade 20. In this way, it is more beneficial to improve the fan efficiency, reduce power and noise. Exemplarily, the first included angle can be 5 degrees, 10 degrees, 15 degrees, 20 degrees, etc.

[0047] As Figure 3 and Figure 4 shown, in one embodiment, the first leading edge segment 231 further has a convex surface 231c connected between the first concave surface 231a and the second concave surface 231b, and the convex surface 231c arches to form a crest towards the side away from the trailing edge 24. The convex surface 231c connects the first concave surface 231a and the second concave surface 231b, enabling the first concave surface 231a and the second concave surface 231b to smoothly transition through the convex surface 231c, which is beneficial to reducing resistance, reducing the fluctuation and instability of the air flow, and achieving a better noise reduction effect.

[0048] As Figure 4 shown, in one embodiment, the straight line connecting the highest point of the convex surface 231c and the center point O of the hub 10 is defined as the second straight line L2, and a second included angle is formed between the second straight line L2 and the reference line L0. The second included angle is not less than 0 degree and not greater than 20 degrees.

[0049] In this embodiment, the highest point of the convex surface 231 refers to the point on the projection plane perpendicular to the axis of the hub 10 where the projection line formed by the convex surface 231 is closest to the reference line. The second included angle is also ∠AOC. It can be understood that the highest point of the convex surface 231c is set closer to the reference line L0 compared to the lowest point of the concave surface. If the angle of the second included angle is too large, it will inevitably cause the lowest point of the concave surface to be farther from the reference line L0, resulting in an excessive area of the recessed area of the leading edge 23, which will overly reduce the area of the blade 20, thereby affecting the structural strength of the blade 20 and the work efficiency of the blade 20. By reasonably designing the angle of the second included angle and limiting it between 0 degree and 20 degrees, that is, 0°≤∠AOC≤20°, the area of the recessed area of the leading edge 23 of the blade 20 is made appropriate, achieving an effective rectifying effect while not overly losing the area of the blade 20 to ensure the structural strength and work efficiency of the blade 20. In this way, it is more beneficial to improve the efficiency of the fan, reduce power and noise. Exemplarily, the second included angle can be 0 degree, 5 degrees, 10 degrees, 15 degrees, 20 degrees, etc.

[0050] Based on the above embodiment, as Figure 4 shown, in one embodiment, in the projection plane perpendicular to the axis of the hub 10, the radius of the axial flow rotor 100 is defined as R, and the straight-line distance between the first intersection point E and the center point O of the hub 10 is r1, where r1 is not greater than 0.7R.

[0051] In this embodiment, the radius R of the axial flow impeller 100 refers to the straight-line distance from the center point O of the hub 10 to the outermost edge of the blade tip 22 in the radial direction of the hub 10. The straight-line distance between the first intersection point E and the center point O of the hub 10 is r1, where r1 is not greater than 0.7R. In this way, the length of the first leading edge segment 231 is appropriate, so that it can ensure that the leading edge 23 of the blade 20 can form a wavy concave area with a certain area, so as to achieve an effective rectification effect and improve the fan efficiency; at the same time, it can ensure that the area of the blade tip 22 is not affected, so as to ensure the structural strength and work efficiency of the blade 20. It can be understood that the first intersection point E is located on the side of the leading edge point A of the blade root 21 away from the hub 10, 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.

[0052] The present utility model also provides an axial flow fan, which includes an axial flow impeller 100 and a motor 200. The motor 200 is drivingly connected to the axial flow impeller 100, and the motor 200 is used to drive the axial flow impeller 100 to rotate. The specific structure of the axial flow impeller 100 refers to the above embodiment. Since this axial flow fan 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 here one by one.

[0053] In this embodiment, the output shaft of the motor 200 is drivingly connected to the hub 10. The axial flow impeller 100 is driven to rotate by the motor 200. Air flows in from the leading edge 23 of the blade 20, and after obtaining a pressure rise by the work of the blade 20, it flows out from the trailing edge 24 of the blade 20, thereby realizing the air supply function. And through the design of the above-mentioned axial flow impeller 100, the noise and power of the axial flow fan can be reduced under the condition of realizing the same air volume.

[0054] The present utility model also provides an air supply device, which includes an axial flow impeller 100 or an axial flow fan having an axial flow impeller 100. The specific structure of the axial flow impeller 100 refers to the above embodiment. Since this air supply device 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 here one by one. Among them, the air supply device includes but is not limited to air conditioners, fans, air purifiers, dehumidifiers, humidifiers, etc.

[0055] In one embodiment, the air supply device is an air conditioner, and the axial flow impeller 100 is arranged in the air conditioner outdoor unit and / or the air conditioner indoor unit of the air conditioner.

[0056] The above is only an exemplary embodiment of the present utility model, and does not thus 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 any 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, each blade having a blade root connected to the hub, a blade tip opposite to the blade root, and a leading edge and a trailing edge respectively provided at both ends of the blade root; On a projection plane perpendicular to the axis of the hub, a straight line connecting the center point of the hub and the leading edge point of the blade root is used as a reference line. The reference line has a first intersection point intersecting with the leading edge. The first intersection point is located between the leading edge point of the blade root and the leading edge point of the blade tip. The leading edge has a first leading edge section connecting the leading edge point of the blade root and the first intersection point. The first leading edge section is recessed towards the side close to the trailing edge relative to the reference line to enclose a recessed area with the reference line. The first leading edge section is at least partially arranged in a wavy shape.

2. The axial flow wind wheel according to claim 1, wherein The first leading edge section has at least two concave surfaces arranged along its extending direction. Each of the concave surfaces is recessed towards the side close to the trailing edge to form a trough.

3. The axial flow wind wheel according to claim 2, characterized in that, Each of the concave surfaces is arranged as an arc surface.

4. The axial flow wind wheel according to claim 2, wherein The at least two concave surfaces include a first concave surface and a second concave surface. A straight line connecting the lowest point of the first concave surface and the lowest point of the second concave surface is defined as a first straight line. The first straight line intersects with the center point of the hub.

5. The axial flow wind wheel according to claim 4, characterized in that, A first included angle is formed between the first straight line and the reference line. The first included angle is not less than 5 degrees and not greater than 20 degrees.

6. The axial flow wind wheel according to claim 4, wherein, The first leading edge section further has a convex surface connected between the first concave surface and the second concave surface. The convex surface arches towards the side away from the trailing edge to form a peak.

7. The axial flow wind wheel according to claim 6, wherein A straight line connecting the highest point of the convex surface and the center point of the hub is defined as a second straight line. A second included angle is formed between the second straight line and the reference line. The second included angle is not less than 0 degrees and not greater than 20 degrees.

8. The axial flow wind wheel according to any one of claims 1 to 7, characterized in that, In a projection plane perpendicular to the axis of the hub, the radius of the axial flow wind turbine is defined as R, and the straight-line distance between the first intersection point and the center point of the hub is r1. Wherein, r1 is not greater than 0.7R.

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

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

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

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