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, the axial flow wind wheel comprises a hub and blades, each blade comprises a first blade part and a second blade part which are arranged in the radial direction of the axial flow wind wheel, the first blade part is located between the hub and the second blade part, and the second blade part is located between the hub and the second blade part. The first blade part is provided with a plurality of first rectification grooves distributed in the radial direction of the axial flow wind wheel, and the multiple first rectification grooves are sequentially connected to form a wave structure which is arranged in the thickness direction of the blade in a fluctuating mode. According to the axial flow wind wheel, separation points of airflow on the blades can be delayed, the attachment length of the airflow on the blades is increased, and therefore the lifting force of the blades can be improved, the effect of improving the operation efficiency of the axial flow wind wheel is achieved, separation of the airflow on the surfaces of the blades is reduced, vortex and turbulent flow are reduced, and noise and vibration generated by the blades are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of air supply equipment, in particular 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. 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 noise during the operation of the axial flow impeller.

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

[0005] A hub; and

[0006] Blades, the blades include a first blade part and a second blade part arranged radially along the axial flow impeller, the first blade part is located between the hub and the second blade part, and the first blade part is provided with a plurality of first rectifying grooves arranged radially along the axial flow impeller, and the plurality of first rectifying grooves are sequentially connected to form a wave structure that undulates in the thickness direction of the blade.

[0007] In an embodiment, the number of the first rectifying grooves is not less than 3 and not more than 10.

[0008] In an embodiment, the width of each first rectifying groove in the radial direction of the axial flow impeller is equal.

[0009] In an embodiment, the blade has a pressure surface and a suction surface arranged oppositely, each first rectifying groove is recessed from the suction surface towards the pressure surface to form a wave valley, and the first blade part further has a connecting part connecting two adjacent first rectifying grooves, and the connecting part protrudes from the pressure surface towards the suction surface to form a wave peak;

[0010] The width of the first rectifying groove in the radial direction of the axial flow impeller is the distance between two adjacent wave peaks.

[0011] In an embodiment, it is defined that the width of the first rectifying groove in the radial direction of the axial flow impeller is r1, and the depth of the first rectifying groove is defined as d, and the d is not greater than 0.1r1.

[0012] In an embodiment, the second blade portion is provided with a second rectifying groove, and the second rectifying groove protrudes from the suction surface toward the pressure surface.

[0013] In an embodiment, the number of the second rectifying grooves is one.

[0014] In an embodiment, on a projection plane perpendicular to the hub axis, the center of the hub is defined as the center point, with the center point as the center of a circle, the projection radius of the blade is defined as R, and the projection radius of the first blade portion is defined as r2, and the r2 is not greater than 0.7R.

[0015] 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.

[0016] The present utility model further provides an air supply device, including the axial flow impeller as described above, or including the axial flow fan as described above.

[0017] In an 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.

[0018] The technical solution of the present utility model optimizes the structure of the blades of the axial flow impeller. A plurality of first rectifying grooves arranged radially along the axial flow impeller are provided in the first blade portion between the second blade portion and the hub, and the plurality of first rectifying grooves can be connected in sequence to form a wavy structure that undulates in the thickness direction of the blade. On the one hand, the undulating wavy structure can help the air flow to adhere to the surface of the blade more smoothly, thereby improving the aerodynamic efficiency and increasing the thrust of the fan, and delaying the separation point of the air flow on the blade, increasing the attachment length of the air flow on the blade, thereby helping to improve the lift of the blade, and ultimately achieving the effect of improving the operating efficiency of the axial flow impeller. On the other hand, the wavy structure that undulates in the thickness direction of the blade can reduce the separation of the air flow on the blade surface, reduce the generation of eddy currents and turbulence, thereby reducing the noise and vibration generated by the blade. 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 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.

[0020] Figure 1 It is a schematic structural diagram of an embodiment of an outdoor unit of an air conditioner provided by the present utility model;

[0021] Figure 2 Structural schematic diagram of an embodiment of the axial-flow wind wheel provided by the present utility model

[0022] Figure 3 is Figure 1 structural schematic diagram of the axial-flow wind wheel at an angle;

[0023] Figure 4 is Figure 1 partial cross-sectional view of the axial-flow wind wheel;

[0024] Figure 5 Air volume-power comparison diagram of the axial-flow wind wheel provided by the present utility model and the existing wind wheel;

[0025] Figure 6 Air volume-noise comparison diagram of the axial-flow fan provided by the present utility model and the existing wind wheel.

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

[0027] 100, axial-flow wind wheel; 10, hub; 20, blade; 21, first blade part; 211, first rectifying groove; 22, second blade part; 221, second rectifying groove; 201, leading edge; 202, trailing edge; 203, blade tip; 204, blade root; 205, pressure surface; 206, suction surface; O, center point;

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

[0029] The realization, functional features and advantages of the object 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 components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0032] In addition, if the embodiments of the present utility model involve descriptions such as "first", "second", etc., 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 indicating 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 ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or inability to implement, 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 fans are widely used in household electrical appliances. For example, most outdoor units of household air conditioners use axial fans. Currently, in air conditioning systems, there are increasingly high requirements for the impeller efficiency and noise of axial fans. The traditional axial impeller 100 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 100 to adapt to the new air conditioning system.

[0034] The present utility model proposes an axial impeller 100. By optimizing the design of the structure of the axial impeller 100, the fan efficiency can be improved, and under the condition of achieving the same air volume, the power and noise can be reduced.

[0035] The axial impeller 100 or the axial fan having the axial impeller 100 can also be applied to air supply equipment, where the air supply equipment includes but is not limited to air conditioners, fans, air purifiers, dehumidifiers, humidifiers, etc. When the air supply equipment is an air conditioner, the axial impeller 100 can be arranged in the outdoor unit and / or indoor unit of the air conditioner.

[0036] Taking the application of the axial impeller 100 to the outdoor unit of an air conditioner as an example, as Figure 1As shown, in one embodiment, the air conditioner outdoor unit includes a casing, an axial flow fan wheel 100, a motor 200 and a heat exchanger 300 arranged in the casing, the casing has an air inlet and an air outlet, the heat exchanger 300 is arranged opposite to the air inlet, the axial flow fan wheel 100 is arranged between the heat exchanger 300 and the air outlet, and the axial flow fan wheel 100 is connected to the motor 200. When the air conditioner outdoor unit is working, the motor 200 drives the axial flow fan wheel 100 to rotate, and the external air can be sucked into the casing through the air inlet and heat exchanged with the heat exchanger 300 before being sent out from the air outlet. Optionally, the casing has an air outlet panel 400 located at 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 matter from entering the interior of the air conditioner outdoor unit. By adopting the axial flow fan wheel 100 of the utility model, the noise and power of the air conditioner outdoor unit can be reduced under the condition of achieving the same air volume, so that it can meet the latest air conditioning energy efficiency and noise requirements. The following mainly describes the implementation of the axial flow wind wheel 100 by way of example.

[0037] See also Figures 2 to 4 In one embodiment of the utility model, the axial flow wind wheel 100 includes a hub 10 and blades 20, the blades 20 include a first blade portion 21 and a second blade portion 22 arranged along the radial direction of the axial flow wind wheel 100, the first blade portion 21 is located between the hub 10 and the second blade portion 22, the first blade portion 21 is provided with a plurality of first rectifying grooves 211 arranged along the radial direction of the axial flow wind wheel 100, and the plurality of first rectifying grooves 211 are connected in sequence to form a wave structure arranged undulating along the thickness direction of the blade 20.

[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, generally two blades 20 are provided, for example, they 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 arranged on the hub 10, and 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, leading edge 201, blade tip 203 and trailing edge 202 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 204 is used to connect the hub 10, and the blade tip 203 is located on the side of the blade root 204 away from the hub 10 to form the free end of the blade 20. In the oncoming flow direction, the leading edge 201 is located on the oncoming flow side of the blade 20, and the trailing edge 202 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 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. Among them, the blade 20 has a pressure surface 205 and a suction surface 206. The pressure surface 205 is located on the air outlet side of the axial flow impeller 100, and the suction surface 206 is located on the other side of the blade 20. When the blade 20 rotates, the pressure surface 205 is impacted by the oncoming air flow head-on, and the pressure is relatively high, while the suction surface 206 moves relatively fast relative to the air flow when the blade 20 rotates, and the pressure is relatively low, forming a low-pressure area.

[0039] Among them, the first blade part 21 refers to the position of the blade 20 close to the blade root 204, and the second blade part 22 refers to the position of the blade 20 close to the blade tip 203. The wavy structure arranged in a fluctuating manner in the thickness direction of the blade 20 refers to a structural feature shape with fluctuations and unevenness, which can be either a regular wave with a regular geometric shape (such as a sine wave, a cosine wave, a sawtooth wave, etc.) or an irregular wavy shape.

[0040] The technical solution of the present utility model optimizes the structure of the blades 20 of the axial flow impeller 100. A plurality of first rectifying grooves 211 arranged radially along the axial flow impeller 100 are provided in the first blade part 21 between the second blade part 22 and the hub 10 of the blade 20, and the plurality of first rectifying grooves 211 can be connected in sequence to form a wavy structure arranged in a undulating manner along the thickness direction of the blade 20. On the one hand, the undulating wavy structure can help the air flow to adhere to the surface of the blade 20 more smoothly, thereby improving the aerodynamic efficiency and increasing the thrust of the fan, and delaying the separation point of the air flow on the blade 20, increasing the adhesion length of the air flow on the blade 20, thereby helping to improve the lift of the blade 20 and finally achieving the effect of improving the operating efficiency of the axial flow impeller 100; on the other hand, the wavy structure arranged in a undulating manner along the thickness direction of the blade 20 can reduce the separation of the air flow on the surface of the blade 20, reduce the generation of eddy currents and turbulence, thereby reducing the noise and vibration generated by the blade 20; on the other hand, the undulating wavy structure can improve the pressure distribution on the blade 20, reduce the local high-pressure area on the blade 20, thereby reducing the load and stress of the blade 20, and since the wavy structure is relatively closer to the hub 10, that is, in the area where the blade 20 bears a greater aerodynamic load, the load in this area can be evenly distributed, better reducing the local stress concentration of the blade 20, and the wavy structure can enhance the structural strength of the blade 20, thereby achieving the effect of increasing the service life of the axial flow impeller 100.

[0041] Optionally, in an embodiment, the number of the first rectifying grooves 211 is not less than 3 and not more than 10. With such a setting, the number of the first rectifying grooves 211 is moderate, neither too many nor too few. It can avoid the situation that the number of the first rectifying grooves 211 is set too few to play an effective rectifying role, resulting in an insignificant effect of improving the operating efficiency of the axial flow impeller 100 and reducing the operating noise of the axial flow impeller 100; at the same time, it can also avoid the situation that the number of the first rectifying grooves 211 is set too many, resulting in complex interference of the air flow on the surface of the blade 20, causing additional turbulence and eddy currents, and the number of the first rectifying grooves 211 is set too many, resulting in an increase in the weight of the blade 20 and an increase in cost caused by the complex design shape of the blade 20. Exemplarily, the number of the first rectifying grooves 211 can be 3, 4, 5, 6, 7, 10, etc.

[0042] Such as Figure 3 、 Figure 4As shown, in one embodiment, the width of each of the first rectifying grooves 211 in the radial direction of the axial flow impeller 100 is equal. With such a setting, the undulation periods of the wave structures formed by sequentially connecting multiple first rectifying grooves 211 are the same. In this way, a more uniform airflow interference can be provided. Since the disturbance received by the airflow is regular, the turbulence generated by the airflow on the surface of the blade 20 can be better reduced, which helps the airflow to adhere to the surface of the blade 20 more smoothly, thereby reducing energy loss, improving the aerodynamic efficiency, and better reducing the generation of noise. In addition, since the undulation periods of the wave structures are the same, it is easier to maintain consistency during the manufacturing process of the blade 20 and simplify the production process of the blade 20.

[0043] As Figure 2 , Figure 4 As shown, in one embodiment, the blade 20 has a pressure surface 205 and a suction surface 206 arranged oppositely. Each of the first rectifying grooves 211 is recessed from the suction surface 206 towards the pressure surface 205 to form a trough, and the first blade part 21 further has a connecting part connecting two adjacent first rectifying grooves 211, and the connecting part protrudes from the pressure surface 205 towards the suction surface 206 to form a crest.

[0044] The width of the first rectifying groove 211 in the radial direction of the axial flow impeller 100 is the distance between two adjacent crests.

[0045] Among them, when the first rectifying groove 211 is set to be recessed towards the pressure surface 205 to form a trough, the surface of the pressure surface 205 can be made to protrude, thereby increasing the contact area between the pressure surface 205 of the blade 20 and the airflow, thus increasing the lift of the blade 20, and being able to reduce the pressure gradient of the pressure surface 205 of the blade 20 and reduce the boundary layer separation phenomenon caused by the pressure reduction difference. In addition, when the connecting part connecting two adjacent first rectifying grooves 211 protrudes from the pressure surface 205 towards the suction surface 206 to form a crest, on the suction surface 206, the position between two adjacent troughs can be made to protrude on the surface of the suction surface 206. When the kinetic energy is higher on the suction surface 206 and the airflow is more likely to escape from the surface of the blade 20, it helps to attract the airflow to adhere more closely to the suction surface 206, can reduce the airflow separation on the suction surface 206 of the blade 20, can improve the adhesion of the boundary layer, and at the same time can also reduce the turbulence and eddy linearity on the suction surface 206 to reduce the aerodynamic noise generated when the blade 20 rotates.

[0046] As Figure 4 As shown, optionally, define the width of the first rectifying groove 211 in the radial direction of the axial flow impeller 100 as r1, and define the depth of the first rectifying groove 211 as d, and the d is not greater than 0.1r1.

[0047] Such a setting makes the depth of the first rectifying groove 211 shallower than the width of the first rectifying groove 211 in the radial direction of the axial flow impeller 100. That is to say, the depth of the undulating wavy structure located in the first blade part 21 is shallower. In this way, it is possible to avoid the problem that the effective cross-sectional area of the blade 20 decreases due to the relatively deep undulating depth of the wavy structure, resulting in a decrease in the structural strength and stiffness of the blade 20. Moreover, the shallower undulating depth of the wavy structure can avoid the problem that too strong air flow interference is generated on the surface of the blade 20, resulting in an increase in air flow separation and turbulence, and thus a decrease in the aerodynamic efficiency of the blade 20. Exemplarily, d can be 0.1r1, 0.09r1, 0.08r1, 0.07r1, 0.06r1, etc.

[0048] As Figure 2 , Figure 4 , in an embodiment, the second blade part 22 is provided with a second rectifying groove 221, and the second rectifying groove 221 protrudes from the suction surface 206 towards the pressure surface 205.

[0049] During the actual operation of the axial flow impeller 100, leakage is more likely to occur in the area of the blade 20 near the blade tip 203. That is, between the blade 20 and the housing of the fan, due to a certain gap, the air flow velocity on the suction surface 206 is faster and the pressure is lower, while the pressure on the pressure surface 205 is higher. The air flow on the high-pressure side is more likely to be pulled towards the low-pressure side through this gap, forming leakage.

[0050] Therefore, the second rectifying groove 221 is provided in the second blade part 22. Since the second blade part 22 is closer to the blade tip 203 area, the second rectifying groove 221 can guide the air flow to flow more smoothly from the blade tip 203 of the blade 20 to the blade root 204 of the blade 20, reducing the formation of eddy currents and reducing the leakage phenomenon caused by air flow separation in the blade tip 203 area. In addition, the second rectifying groove 221 can also reduce the noise generated in the blade tip 203 area by reducing the formation of eddy currents in the blade tip 203 area, thereby further reducing the noise generated during the operation of the axial flow impeller 100.

[0051] In the present utility model, when a relatively large number of second rectifying grooves 221 are provided in the area of the blade 20 near the blade tip 203, it will cause a decrease in the overall structural strength of the area of the blade 20 near the blade tip 203, affecting the durability of the blade 20 during rotation, and setting a relatively large number of second rectifying grooves 221 will cause stress concentration problems in the blade tip 203 area. When the blade 20 is subjected to aerodynamic loads or other acting forces, it is more likely to be damaged. Therefore, in an embodiment of the present utility model, optionally, the number of the second rectifying grooves 221 is 1. Of course, in other embodiments of the present utility model, the number of the second rectifying grooves 221 can also be set to 2, 3, etc.

[0052] As Figure 3 、 Figure 4 shown, on the projection plane perpendicular to the axis of the hub 10, the center of the hub 10 is defined as the center point O. With the center point O as the center of the circle, the projection radius of the blade 20 is defined as R, and the projection radius of the first blade part 21 is defined as r2, and the r2 is not greater than 0.7R.

[0053] 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 r2, where r2 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 wave structure formed by sequentially connecting a plurality of first rectifying grooves 211 will not be too close to the blade tip 203 area, and will only be rectified in the middle area of the blade 20 and the area of the blade 20 close to the blade root 204; thus, it can ensure that the area of the blade tip 203 part will not be affected. When only a small number of second rectifying grooves 221 are provided in the second blade part 22, the structural strength and work efficiency of the blade 20 can be ensured. It can be understood that the first blade part 21 is located between the hub 10 and the second blade part 22, so r2 should also be greater than the radius r of the hub 10. That is, r < r2 ≤ 0.7R. Exemplarily, r1 can be 0.1R, 0.2R, 0.3R, 0.4R, 0.5R, 0.6R, 0.7R, etc.

[0054] The existing wind wheel (that is, a wind wheel with a smooth surface) is experimentally compared with the axial flow wind wheel 100 provided by an embodiment of the present invention (hereinafter referred to as the wind wheel with the first rectifying groove and the second rectifying groove in this solution), and the air volume-power comparison diagram as shown in Figure 5 is obtained, and the air volume-noise comparison diagram as shown in Figure 6 is obtained. As can be seen from Figure 5 , in the case of the same air volume, the power of the wind wheel with the first rectifying groove and the second rectifying groove provided by this solution is less than the power of the existing wind wheel, and it can achieve a good effect of reducing power. As can be seen from Figure 6 , in the case of the same air volume, the noise of the wind wheel with the first rectifying groove and the second rectifying groove provided by this solution is less than the noise of the existing wind wheel, and it can achieve a good effect of reducing noise.

[0055] The present invention also proposes an axial flow fan, which includes a motor 200 and an axial flow wind wheel 100. The specific structure of the axial flow wind wheel 100 refers to the above embodiment. Since this air conditioner outdoor unit adopts all the technical solutions of the above all embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated one by one here.

[0056] In this embodiment, the output shaft of the motor 200 is drivingly connected to the hub 10. The axial flow impeller 100 is rotated by driving the motor 200. Air flows into the leading edge 201 of the blade 20, and after obtaining a pressure rise by the work done by 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 axial flow impeller 100 as described above, the noise and power of the axial flow fan can be reduced under the condition of realizing the same air volume.

[0057] The present utility model also proposes an air supply device, including 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 at least has all the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated one by one here. Among them, the air supply device includes but is not limited to air conditioners, fans, air purifiers, dehumidifiers, humidifiers, etc.

[0058] 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.

[0059] The above description is only an exemplary embodiment of the present utility model, and does not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made by using the content of the specification and drawings of the present utility model under the technical concept 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, the blades comprising a first blade part and a second blade part arranged radially along the axial flow wind wheel, the first blade part being located between the hub and the second blade part, the first blade part being provided with a plurality of first rectifying grooves arranged radially along the axial flow wind wheel, and the plurality of first rectifying grooves being sequentially connected to form a wave structure that undulates in the thickness direction of the blade.

2. The axial flow wind wheel according to claim 1, characterized in that, The number of the first rectifying grooves is not less than 3 and not more than 10.

3. The axial flow wind wheel according to claim 1, characterized in that, The width of each of the first rectifying grooves in the radial direction of the axial flow wind wheel is equal.

4. The axial flow wind wheel according to claim 3, wherein, The blade has a pressure surface and a suction surface arranged opposite to each other. Each of the first rectifying grooves is recessed from the suction surface towards the pressure surface to form a trough, and the first blade part further has a connecting part connecting two adjacent first rectifying grooves, and the connecting part protrudes from the pressure surface towards the suction surface to form a crest; The width of the first rectifying groove in the radial direction of the axial flow wind wheel is the distance between two adjacent crests.

5. The axial flow wind wheel according to claim 4, wherein Define the width of the first rectifying groove in the radial direction of the axial flow wind wheel as r1, define the depth of the first rectifying groove as d, and the d is not greater than 0.1r1.

6. The axial flow wind wheel according to claim 4, characterized in that, The second blade part is provided with a second rectifying groove, and the second rectifying groove protrudes from the suction surface towards the pressure surface.

7. The axial flow wind wheel according to claim 6, characterized in that, The number of the second rectifying grooves is 1.

8. The axial flow wind wheel according to any one of claims 1 to 7, characterized in that, On a projection plane perpendicular to the axis of the hub, define the center of the hub as the center point, with the center point as the center of a circle, define the projection radius of the blade as R, and define the projection radius of the first blade part as r2, and the r2 is not greater than 0.7R.

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

10. An air supply device, characterized in that, Comprising an axial flow wind wheel according to any one of claims 1 to 8, or comprising an 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 wheel is arranged in the air conditioner outdoor unit and / or the air conditioner indoor unit of the air conditioner.

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