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, 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 trailing edge point of the blade root serves as a datum line, the trailing edge is provided with a protruding section protruding towards the side away from the front edge relative to the datum line, and a protruding part is defined by the protruding section and the datum line. According to the technical scheme, the efficiency of the fan can be improved, and power and noise can be reduced under the condition that the same air volume is achieved.

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 fan efficiency and generates 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 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 propose an axial flow impeller, an axial flow fan and an air supply equipment, aiming to improve the fan efficiency and reduce the power and noise under the condition of achieving the same air volume.

[0004] To achieve the above purpose, 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, 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 trailing edge point of the blade root is used as the reference line, and the trailing edge has a protruding section protruding toward the side away from the leading edge relative to the reference line, and the protruding section and the reference line enclose a convex part.

[0008] In an embodiment, on the projection plane perpendicular to the axis of the hub, the radius of the axial flow impeller is defined as R, the radius of the hub is r, and the straight-line distance between the center point of the hub and the most protruding point of the convex part is r1;

[0009] Satisfying that r1 is greater than r and r1 is less than [r + ((R - r) / 2)].

[0010] In an embodiment, the protruding section is arranged in an arc shape.

[0011] In an embodiment, at least two such protruding sections are formed along the extending direction of the trailing edge.

[0012] In an embodiment, the end of the protruding section close to the hub coincides with the trailing edge point of the blade root.

[0013] In one embodiment, the blade further has a blade tip disposed opposite to the blade root. On the projection plane perpendicular to the axis of the hub, a straight line connecting the center point of the hub and the trailing edge point of the blade tip is defined as the first straight line, and a straight line connecting the center point of the hub and the most protruding point of the convex portion is defined as the second straight line. The first straight line and the second straight line are respectively disposed on both sides of the reference line.

[0014] In one embodiment, a first included angle is formed between the first straight line and the reference line, and the first included angle is greater than 0 degree and not more than 30 degrees; and / or,

[0015] A second included angle is formed between the second straight line and the reference line, and the second included angle is greater than 0 degree and not more than 30 degrees.

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

[0017] The present utility model further provides an air supply device, including the axial flow impeller or 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 disposed in the outdoor unit and / or the indoor unit of the air conditioner.

[0019] Through the optimized design of the blade structure of the axial flow impeller according to the technical solution of the present utility model, on the projection plane perpendicular to the axis of the hub, a straight line connecting the center point of the hub and the trailing edge point of the blade root is used as the reference line, so that the trailing edge of the blade has a protruding section protruding toward the side away from the leading edge relative to the reference line, and the protruding section and the reference line enclose a convex portion. Thus, at least a part of the trailing edge has a protruding portion relative to the reference line. By the protrusion of the trailing edge, the work area of the impeller can be increased. Meanwhile, the flow separation is most obvious at the blade root. By increasing the chord length (the chord length is the length of a single blade in the circumferential direction) at the blade root through the protrusion of the trailing edge, the flow separation can be inhibited, the efficiency of the fan can be improved, and the shedding of vortices can be reduced by inhibiting the flow separation, thereby reducing the noise. The axial flow impeller designed by this solution can improve the efficiency of the fan, and can reduce the power and noise under the condition of achieving the same air volume. 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, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

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

[0022] Figure 2 Schematic structural view of an embodiment of the axial flow impeller provided by the present utility model;

[0023] Figure 3 is Figure 1 Schematic structural view of the axial flow impeller from another perspective in

[0024] Figure 4 Air volume - power comparison chart of the original impeller and the axial flow impeller of an embodiment of the present utility model;

[0025] Figure 5 Air volume - noise comparison chart of the original impeller and the axial flow impeller of an embodiment of the present utility model.

[0026] Explanation of the reference numerals in the drawings:

[0027] 100, axial flow impeller; 10, hub; 20, blade; 21, blade root; 22, blade tip; 23, leading edge; 24, trailing edge; 241, protruding section; A, center point of the hub; B, most protruding point of the convex part; C, trailing edge point of the blade tip; D, trailing edge point of the blade root; L0, reference line; L1, first straight line; L2, second straight line;

[0028] 200, motor; 300, heat exchanger; 400, air outlet panel; 500, grille.

[0029] 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. Detailed implementation manners

[0030] 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 shall fall within the protection scope of the present utility model.

[0031] 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 the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0032] In addition, if there are descriptions such as "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", "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 fact that those of ordinary skill in the art can implement it. 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.

[0033] Axial flow fans have a wide range of applications in household electrical appliances. For example, most of the outdoor units of household air conditioners use axial flow fans. When the traditional axial flow impeller of an axial flow fan rotates at high speed, flow separation will occur, affecting the fan efficiency and generating relatively large fan noise. And in the air conditioning system, the requirements for the impeller efficiency and noise 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.

[0034] The present utility model provides 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.

[0035] The axial flow impeller 100 or the axial flow fan having the axial flow impeller 100 can also be applied to a air supply device. Among them, the air supply device includes but is 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.

[0036] Taking the application of the axial flow impeller 100 to 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 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 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, 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 mesh cover 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, 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 impeller 100.

[0037] Please refer to Figure 2 and Figure 3 , 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 blade root 21 and a blade tip 22 which are oppositely arranged, and a leading edge 23 and a trailing edge 24 which are oppositely arranged. 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, and the blade root 21 is connected to the hub 10. On the projection plane perpendicular to the axis of the hub 10, a straight line connecting the center point A of the hub 10 and the trailing edge point D of the blade root 21 is used as a reference line L0. The trailing edge 24 has a protruding section 241 that protrudes from the reference line L0 toward the side away from the leading edge 23, and the protruding section 241 and the reference line L0 enclose a convex portion.

[0038] 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 to 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 a 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 a plane perpendicular to the axis of the hub 10.

[0039] In this embodiment, on the projection plane perpendicular to the axis of the hub 10, the straight line connecting the center point A of the hub 10 and the trailing edge point D of the blade root 21 is used as the reference line L0. Among them, the center point A of the hub 10 is also the rotation center of the axial flow impeller 100, and the trailing edge point D of the blade root 21 is also the intersection point of the blade root 21 and the trailing edge 24. The reference line L0 is also the straight line obtained by extending the line segment connecting the center point A of the hub 10 and the trailing edge point D of the blade root 21. The trailing edge 24 has a protruding section 241 that protrudes toward the side away from the leading edge 23 relative to the reference line L0, and the protruding section 241 and the reference line L0 enclose a convex portion. That is, the protruding section 241 is located on the side of the reference line L0 away from the leading edge 23, so that the trailing edge 24 has at least a partially protruding portion relative to the reference line L0. Through the protruding portion of the trailing edge 24, the work area of the impeller can be increased. At the same time, the flow separation is most obvious at the blade root 21. By increasing the chord length (the chord length is the length of a single blade 20 in the circumferential direction) at the trailing edge 24, the flow separation can be suppressed, the fan efficiency can be improved, and the shedding of vortices can be reduced by suppressing the flow separation, thereby reducing the noise.

[0040] The original impeller (that is, the impeller without a protruding portion at the trailing edge) is compared with the axial flow impeller 100 provided in an embodiment of the present invention (hereinafter referred to as the trailing edge protruding impeller) through experiments, and the experimental data comparison diagrams as shown in Figure 4 and Figure 5 are obtained. Among them, Figure 4 is the air volume-power comparison diagram of the original impeller and the trailing edge protruding impeller of the present solution, Figure 5It is a comparison chart of air volume - noise between the original wind wheel and the trailing - edge protruding wind wheel of this solution.

[0041] From Figure 4 and Figure 5 it can be seen that under the condition of the same air volume, the power of the trailing - edge protruding wind wheel provided by this solution is less than that of the original wind wheel, and the noise of the trailing - edge protruding wind wheel provided by this solution is less than that of the original wind wheel. Through analysis, in the technical solution of this application, by providing a protruding part at the trailing edge 24 of the blade 20, compared with the original wind wheel (that is, the wind wheel without a protruding part at the trailing edge), under the condition of the same air volume, the noise can be reduced by 1.0 dB to 1.5 dB, and the power can be reduced by about 3 W, which can achieve a good effect of reducing power and noise.

[0042] In the axial - flow wind wheel 100 of the technical solution of the present utility model, by optimizing the design of the blade 20 structure, on the projection plane perpendicular to the axis of the hub 10, the straight line connecting the center point A of the hub 10 and the trailing - edge point D of the blade root 21 is used as the reference line L0, so that the trailing edge 24 of the blade 20 has a protruding section 241 protruding towards the side away from the leading edge 23 relative to the reference line L0, and the protruding section 241 and the reference line L0 enclose a convex part. Thus, the trailing edge 24 has at least a partial protruding part relative to the reference line L0. By the protrusion of the trailing edge 24, the work - done area of the wind wheel can be increased. At the same time, the flow separation is most obvious at the blade root 21. By the protrusion of the trailing edge 24, the chord length at the blade root 21 is increased, which can inhibit the flow separation, improve the fan efficiency, and inhibiting the flow separation can also reduce the shedding of vortices, thereby reducing the noise. The axial - flow wind wheel 100 designed by this solution can improve the fan efficiency and can reduce the power and noise under the condition of achieving the same air volume.

[0043] As Figure 3 shown, in one of the embodiments, on the projection plane perpendicular to the axis of the hub 10, the radius of the axial - flow wind wheel 100 is defined as R, the radius of the hub 10 is defined as r, and the straight - line distance between the center point A of the hub 10 and the most protruding point B of the convex part is defined as r1; it satisfies that r1 is greater than r and r1 is less than [r + ((R - r) / 2)].

[0044] In this embodiment, the radius R of the axial flow wind wheel 100 refers to the straight-line distance from the center point A of the hub 10 to the outermost edge of the blade tip 22 in the radial direction of the hub 10; the radius r of the hub 10 refers to the straight-line distance from the center point A of the hub 10 to the outermost edge of the hub 10 in the radial direction of the hub 10; the most protruding point B of the convex part refers to the point on the protruding section 241 of the trailing edge 24 that has the farthest straight-line distance from the reference line L0. By designing the position of the convex part to satisfy r < r1 < [r + ((R - r) / 2)], in this way, the convex part of the trailing edge 24 can be arranged closer to the root 21 of the blade, so as to further increase the work done at the root 21 of the blade, reduce the power, and effectively prevent the flow separation at the root 21 of the blade, achieving a better noise reduction effect.

[0045] Optionally, the protruding section 241 is arranged in an arc shape. In this way, the overall line type of the protruding section 241 is smoother, which is beneficial to achieving a better noise reduction effect.

[0046] Optionally, the trailing edge 24 is arranged in an arc shape. In this way, the overall line type of the trailing edge 24 is smoother, which is beneficial to achieving a better noise reduction effect.

[0047] In one embodiment, at least two of the protruding sections 241 are formed along the extending direction of the trailing edge 24. That is, there are at least two protruding sections 241 between the root 21 and the tip 22 of the trailing edge 24, making the trailing edge 24 present a wavy structure. Each protruding section 241 protrudes towards the side away from the leading edge 23 compared to the reference line L0, and each protruding section 241 and the reference line L0 enclose a convex part, so that at least two convex parts are formed at the part of the blade 20 close to the trailing edge 24. By arranging multiple convex parts, the work area of the wind wheel can be further increased, and the flow separation at the root 21 of the blade can be inhibited, thereby further improving the efficiency of the fan, reducing the power and noise.

[0048] Such as Figure 3As shown, in one embodiment, the end of the protruding section 241 close to the hub 10 coincides with the trailing edge point D of the blade root 21. In this embodiment, the two ends of the protruding section 241 of the trailing edge 24 respectively intersect with the reference line L0 to form a first intersection point and a second intersection point, and the second intersection point is located on the side of the first intersection point away from the blade root 21. In this way, the protruding section 241 of the trailing edge 24 of the blade 20 gradually bulges a distance relative to the reference line L0 from the end close to the blade root 21 toward the side away from the leading edge 23 and then approaches and intersects the reference line L0, so that the protruding section 241 and the reference line L0 enclose a convex part with a high middle and low sides. The coincidence of the first intersection point of the protruding section 241 with the trailing edge point D of the blade root 21 makes the convex part closer to the blade root 21, so that the work done at the blade root 21 can be increased more effectively, the power can be reduced, and the flow separation at the blade root 21 can be effectively prevented, achieving a better noise reduction effect. Optionally, the distance between the first intersection point and the second intersection point is greater than the radius r of the hub 10 and less than the radius R of the axial flow rotor 100.

[0049] Based on the above embodiment, as Figure 3 shown, in one embodiment, on the projection plane perpendicular to the axis of the hub 10, the straight line connecting the center point A of the hub 10 and the trailing edge point C of the blade tip 22 is defined as the first straight line L1, and the straight line connecting the center point A of the hub 10 and the most protruding point B of the convex part is defined as the second straight line L2, and the first straight line L1 and the second straight line L2 are respectively located on both sides of the reference line L0.

[0050] In this embodiment, the trailing edge point C of the blade tip 22 refers to the intersection point of the blade tip 22 and the trailing edge 24. Among them, the trailing edge point D of the blade root 21 is located on the side of the reference line L0 close to the leading edge 23, and the most protruding point B of the convex part is located on the side of the reference line L0 close to the trailing edge 24, so that the first straight line L1 and the second straight line L2 are respectively located on both sides of the reference line L0. If the reference line L0 is used as the axis, the clockwise rotation angle is defined as positive and the counterclockwise rotation angle is defined as negative, then the first straight line L1 rotates clockwise by a preset positive angle relative to the reference line L0, and the second straight line L2 rotates counterclockwise by a preset negative angle relative to the reference line L0.

[0051] As Figure 3 shown, in one embodiment, a first included angle is formed between the first straight line L1 and the reference line L0, and the first included angle is greater than 0 degrees and does not exceed 30 degrees. Denote the first included angle as α, then 0° < α ≤ 30°. In this way, the distance between the trailing edge point C of the blade tip 22 and the reference line L0 is not too large, so as to ensure that the trailing edge 24 of the blade 20 can do work more effectively and suppress flow separation, thus achieving a better effect of reducing power and reducing noise. Among them, the first included angle α includes but is not limited to 5 degrees, 10 degrees, 15 degrees, 20 degrees, 25 degrees, 30 degrees, etc.

[0052] As Figure 3 shown, in one embodiment, a second included angle is formed between the second straight line L2 and the reference line L0, and the second included angle is greater than 0 degree and not more than 30 degrees. Denote the second included angle as β, then 0° < β ≤ 30°. In this way, the distance from the most protruding point B of the convex part to the reference line L0 is not too large, so as to ensure that the trailing edge 24 of the blade 20 can do work more effectively and suppress flow separation, thereby achieving a better effect of reducing power and noise. Among them, the second included angle β includes, but is not limited to, 5 degrees, 10 degrees, 15 degrees, 20 degrees, 25 degrees, 30 degrees, etc.

[0053] In order to do work more effectively and suppress flow separation, and achieve a better effect of reducing power and noise, optionally, 0° < α ≤ 30° and 0° < β ≤ 30°.

[0054] The present utility model further 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.

[0055] In this embodiment, the output shaft of the motor 200 is drivingly connected to the hub 10. By driving the motor 200 to rotate the axial flow impeller 100, air flows into the leading edge 23 of the blade 20 and flows out from the trailing edge 24 of the blade 20 after obtaining a pressure rise by the work done by the blade 20, thereby realizing the air supply function. And through the design of the above axial flow impeller 100, the efficiency of the fan can be improved, and the power and noise can be reduced under the condition of realizing the same air volume.

[0056] The present utility model further 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.

[0057] 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.

[0058] The above are only exemplary embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. 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 within 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, 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 trailing edge point of the blade root is used as a reference line. The trailing edge has a protruding section protruding towards the side away from the leading edge relative to the reference line, and the protruding section and the reference line enclose a convex part.

2. The axial flow wind wheel according to claim 1, characterized in that, On a projection plane perpendicular to the axis of the hub, define the radius of the axial flow wind turbine as R, the radius of the hub as r, and the straight-line distance between the center point of the hub and the most protruding point of the convex part as r1; Satisfying that r1 is greater than r and r1 is less than [r + ((R - r) / 2)].

3. The axial flow wind wheel according to claim 1, characterized in that, The protruding section is arranged in an arc shape.

4. The axial flow wind wheel according to claim 1, characterized in that, At least two such protruding sections are formed along the extending direction of the trailing edge.

5. The axial flow wind wheel according to claim 1, characterized in that, One end of the protruding section close to the hub coincides with the trailing edge point of the blade root.

6. The axial flow wind wheel according to any one of claims 1 to 5, characterized in that, The blade further has a blade tip opposite to 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 trailing edge point of the blade tip is defined as a first straight line, and a straight line connecting the center point of the hub and the most protruding point of the convex part is defined as a second straight line. The first straight line and the second straight line are respectively arranged on both sides of the reference line.

7. The axial flow wind wheel according to claim 6, characterized in that, A first included angle is formed between the first straight line and the reference line, and the first included angle is greater than 0 degrees and does not exceed 30 degrees; and / or A second included angle is formed between the second straight line and the reference line, and the second included angle is greater than 0 degrees and does not exceed 30 degrees.

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 is drivingly connected to the axial flow wind turbine, and the motor is 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, 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 the indoor unit of the air conditioner.

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