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. And the blades are arranged on the hub, each blade is provided with a blade top away from the hub, a front edge and a tail edge, the front edge and the tail edge are arranged at the two ends of the blade top respectively, and a notch is formed in the side, close to the tail edge, of the blade top. According to the technical scheme, the acting area is increased, vortexes can be reduced, airflow separation can be reduced, and noise during operation can be lowered.

Description

Technical Field

[0001] The utility model relates to the technical field of wind wheels, in particular to an axial flow wind wheel, an axial flow fan and air supply equipment. Background Art

[0002] Currently, axial-flow fan technology is widely used in household appliances. Fan noise is a key design consideration in household air conditioners. High-speed rotation of the impeller can cause flow separation, impacting both fan efficiency and noise. Traditional axial-flow fans experience flow separation at high speeds, impacting fan efficiency and generating significant fan noise. With air conditioning systems increasingly demanding higher efficiency and noise levels, traditional axial-flow impellers are no longer able to meet the latest energy efficiency and noise requirements. A high-efficiency, low-noise axial-flow impeller is urgently needed to adapt to these new systems. Utility Model Content

[0003] The main purpose of the utility model is to provide an axial flow fan, an axial flow fan and an air supply device, which are intended to increase the working area, reduce eddy currents, reduce the occurrence of air flow separation and reduce noise during operation.

[0004] To achieve the above objectives, the present invention provides an axial flow wind wheel, comprising:

[0005] wheel hubs; and

[0006] The blade is arranged on the hub, and the blade has a blade top arranged away from the hub, and a leading edge and a trailing edge respectively arranged at both ends of the blade top, and a notch is provided on a side of the blade top close to the trailing edge.

[0007] In one embodiment, the blade tip has a first section and a second section connected to each other along its extension direction, an end of the first section away from the second section is connected to the trailing edge, an end of the second section away from the first section is connected to the leading edge, and the first section is offset relative to the second section toward a side close to the hub so that the gap is formed in the area between the first section and the second section.

[0008] In one embodiment, the axial flow wind wheel is used to cooperate with an air guide ring, and the air guide ring is coaxially sleeved outside the axial flow wind wheel. On a projection plane perpendicular to the hub axis, the inner edge radius of the air guide ring is defined as r1, the point of the first section closest to the hub in the radial direction of the hub is defined as the lowest point C of the blade tip, and the point of the second section farthest from the hub in the radial direction of the hub is defined as the highest point D of the blade tip. The straight-line distance between the highest point D of the blade tip and the center point O of the hub is defined as r2, and the straight-line distance between the lowest point C of the blade tip and the center point O of the hub is defined as r;

[0009] Among them, r1 is greater than r, and r1 is less than r2.

[0010] In one embodiment, a minimum distance between the axial flow impeller and the air guide ring is defined as L on a projection plane parallel to the hub axis;

[0011] Where L = r2-r.

[0012] In one embodiment, L is not less than 3 mm and not more than 12 mm.

[0013] In one embodiment, the difference between r and r2 and r1 is not less than 1 mm and not more than 3 mm.

[0014] In one embodiment, the air guide ring is provided with a flange, and in a projection plane perpendicular to the hub axis, the center of curvature of the flange is defined as O1, the center of curvature of the first section is defined as O2, and the center of curvature of the second section is defined as O3, wherein O1, O2 and O3 are located on the same axis.

[0015] The present invention further provides an axial flow fan, comprising a motor and the axial flow wind wheel as described above, wherein 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 invention also provides an air supply device, comprising the axial flow wind wheel or axial flow fan as described above.

[0017] In one embodiment, the air supply device is an air conditioner, and the axial flow fan is provided on an outdoor unit and / or an indoor unit of the air conditioner.

[0018] The technical solution of the present utility model discloses an axial flow impeller. The key point of the solution lies in the provision of a notch. The notch changes the way airflow reaches the trailing edge, forcing it to bypass the notch instead of flowing directly along the trailing edge as with conventional blades. This change helps distribute the airflow more evenly across the blade surface, thereby increasing the effective contact area between the airflow and the blade. When airflow separation is reduced, more airflow can more stably adhere to the blade surface, effectively increasing the effective contact area between the airflow and the blade. Vortices are swirling vortices that form near the trailing edge after airflow separation. They occupy a certain amount of space and hinder contact between the airflow and the blade. The notch helps reduce the formation of vortices, allowing the space previously occupied by vortices to be used for contact between the airflow and the blade, thereby indirectly increasing the effective contact area. By changing the flow characteristics of the airflow, the notch improves the distribution of the airflow across the blade, reducing airflow separation and vortex formation, thereby indirectly increasing the effective contact area between the airflow and the blade. Therefore, designing a notch on the side of the blade tip near the trailing edge not only increases the working area of ​​the axial flow impeller but also reduces vortices, helping airflow flow more smoothly across the blade surface, thereby reducing the occurrence of airflow separation and lowering noise during operation. As can be seen, the notch changes the structure of the blade's trailing edge, reduces the impact of vortices, adjusts airflow distribution, reduces noise, and improves the aerodynamic performance of the entire axial-flow wind turbine. Furthermore, the notch reduces material usage, thereby reducing blade weight and helping to increase the overall speed and response speed of the entire axial-flow wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] Figure 1 This is a structural diagram of an embodiment of an axial flow wind wheel provided by the present utility model;

[0021] Figure 2 for Figure 1 An enlarged view of a partial view A;

[0022] Figure 3 This is a structural schematic diagram of another embodiment of the axial flow wind wheel provided by the present utility model;

[0023] Figure 4 A structural schematic diagram of another embodiment of the axial flow wind wheel provided by the present utility model;

[0024] Figure 5 for Figure 4an enlarged view of a partial view B;

[0025] Figure 6 This is a structural schematic diagram of an embodiment of an air conditioner outdoor unit provided by the utility model.

[0026] Description of Figure Numbers:

[0027] 100, axial flow fan; 200, motor; 300, heat exchanger; 400, air outlet panel; 500, mesh cover;

[0028] 10. Hub; 20. Blade; 21. Blade tip; 211. First section; 212. Second section; 22. Leading edge; 23. Trailing edge; 24. Notch; 30. Air guide ring; 31. Flanged edge; C. Lowest point of blade tip; D. Highest point of blade tip; O. Center point of hub.

[0029] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0031] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "C and / or D" as an example, it includes solution C, solution D, or solutions that satisfy both C and D. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] The utility model provides an axial flow wind wheel, an axial flow fan and air supply equipment.

[0034] Axial fans are widely used in household appliances. For example, most outdoor units of home air conditioners utilize axial fans. However, the high-speed rotation of the impeller in traditional axial fans can cause flow separation, affecting fan efficiency and generating significant fan noise. With increasingly stringent requirements for impeller efficiency and noise in air conditioning systems, traditional axial impellers are no longer able to meet the latest energy efficiency and noise requirements. Consequently, a high-efficiency, low-noise axial impeller is urgently needed to adapt to these new air conditioning systems.

[0035] The present invention provides an axial flow wind wheel 100, which optimizes the structure of the axial flow wind wheel 100 to increase the working area, reduce eddy currents, and help the air flow to flow more smoothly through the surface of the blade 20, thereby reducing the occurrence of air flow separation and reducing noise during operation.

[0036] The axial flow rotor 100 or an axial flow fan having the axial flow rotor 100 can also be used in air supply equipment, wherein 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 flow rotor 100 can be installed in the outdoor unit and / or indoor unit of the air conditioner.

[0037] Take the axial flow fan 100 applied to the outdoor unit of the air conditioner as an example. Figure 6 As shown, in one embodiment, an air conditioner outdoor unit includes a housing, an axial-flow fan 100, a motor 200, and a heat exchanger 300 disposed within the housing. The housing has an air inlet and an air outlet. The heat exchanger 300 is disposed opposite the air inlet. The axial-flow fan 100 is disposed between the heat exchanger 300 and the air outlet, and the axial-flow fan 100 is drivably connected to the motor 200. When the air conditioner outdoor unit is in operation, the motor 200 drives the axial-flow fan 100 to rotate, drawing outside air into the housing through the air inlet, exchanging heat with the heat exchanger 300, and then discharging it through the air outlet. Optionally, the housing includes an air outlet panel 400 located on the front side, which is provided with an air outlet. 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 100 of the present invention, the noise and power of the air conditioner outdoor unit can be reduced while achieving the same air volume, enabling it to meet the latest energy efficiency and noise requirements for air conditioners. The following mainly describes the implementation of the axial flow wind wheel 100 by way of example.

[0038] Reference Figures 1 to 5 In the embodiment of the present utility model, the present application proposes an axial flow wind wheel, comprising:

[0039] a wheel hub 10; and

[0040] The blade 20 is provided on the hub 10 , and has a blade top 21 disposed away from the hub 10 , and a leading edge 22 and a trailing edge 23 respectively disposed at both ends of the blade top 21 . The blade top 21 has a notch 24 on one side close to the trailing edge 23 .

[0041] As can be understood, the axial flow wind wheel 100 includes a hub 10 and blades 20 arranged on the periphery of the hub 10. 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. For example, three blades 20 are evenly spaced and arranged circumferentially on the hub 10, and the shape and thickness of each blade 20 are substantially the same to ensure the stability of the axial flow wind wheel 100 during rotation. Taking a single blade 20 as an example, the blade root, blade tip 21, leading edge 22 and trailing edge 23 of the blade 20 are connected end to end in sequence to form the outer peripheral contour of the blade 20. The blade root is used to connect to the hub 10, and the blade tip 21 is located on the side of the blade root away from the hub 10 to form the free end of the blade 20. In the incoming flow direction, the leading edge 22 is located on the incoming flow side of the blade 20, and the trailing edge 23 is located on the outgoing flow side of the blade 20. The axial-flow fan wheel 100 is driven by a motor 200 to rotate. Airflow flows in from the leading edge 22 of the blades 20, and after the blades 20 generate pressure rise due to work, it flows out from the trailing edge 23 of the blades 20, thereby achieving the air supply function. The projection plane parallel to the axis of the hub 10 refers to the projection plane formed by projecting the axial-flow fan wheel 100 onto a plane parallel to the axis of the hub 10; the projection plane perpendicular to the axis of the hub 10 refers to the projection plane formed by projecting the axial-flow fan wheel 100 onto a plane perpendicular to the axis of the hub 10.

[0042] This solution is an axial flow rotor 100. The hub 10 is the central part of the axial flow rotor 100 and is used to secure and support the blades 20. The blades 20 are mounted on the hub 10 to generate thrust. A notch 24 is located on the side of the blade tip 21 near the trailing edge 23. The notch 24 changes the way the airflow reaches the trailing edge 23, so that the airflow no longer flows directly along the trailing edge 23 as in conventional blades 20, but instead flows around the notch. This change helps to more evenly distribute the airflow over the surface of the blade 20, thereby increasing the effective contact area between the airflow and the blade 20. When airflow separation is reduced, more airflow can more stably adhere to the surface of the blade 20, which is equivalent to increasing the effective contact area between the airflow and the blade 20. Vortexes are swirling vortices formed near the trailing edge 23 after airflow separation. They occupy a certain amount of space and hinder the contact between the airflow and the blade 20. The notch 24 helps to reduce the formation of vortexes, allowing the space originally occupied by vortexes to be used for contact between the airflow and the blade 20, thereby indirectly increasing the effective contact area. By altering the flow characteristics of the airflow, the notch 24 improves the distribution of airflow over the blade 20, reducing airflow separation and vortex formation, and thereby indirectly increasing the effective contact area between the airflow and the blade 20. Therefore, designing the notch 24 on the side of the blade tip 21 near the trailing edge 23 not only increases the working area of ​​the axial flow rotor 100 but also reduces vortexes, helping the airflow flow more smoothly over the surface of the blade 20, thereby reducing airflow separation and lowering noise during operation. Thus, the provision of the notch 24 alters the structure of the blade trailing edge 23, reduces the impact of vortexes, adjusts airflow distribution, reduces noise, and improves the aerodynamic performance of the entire axial flow rotor 100. Furthermore, the notch 24 reduces material usage, thereby reducing the weight of the blade 20 and helping to increase the overall speed and response speed of the entire axial flow rotor 100. It is understood that the notch 24 can be, but is not limited to, a straight edge. Alternatively, the corners of the notch 24 may be rounded to reduce stress concentration. Alternatively, the edges of the notch 24 may be curved to improve airflow distribution.

[0043] Reference Figures 1 to 5 In the embodiment of the present invention, the blade tip 21 has a first section 211 and a second section 212 connected to each other along its extension direction, the end of the first section 211 away from the second section 212 is connected to the trailing edge 23, and the end of the second section 212 away from the first section 211 is connected to the leading edge 22, and the first section 211 is offset relative to the second section 212 toward the side close to the hub 10, so that the area between the first section 211 and the second section 212 forms the notch 24.

[0044] The blade tip 21 consists of two sections: a first section 211 and a second section 212, which are connected along the blade tip 21's extension direction. One end of the first section 211 is connected to the trailing edge 23, while one end of the second section 212 is connected to the leading edge 22. The first section 211 is offset relative to the second section 212, closer to the hub 10. It is understood that the first section 211 is closer to the hub 10 than the second section 212. Due to the offset between the first section 211 and the second section 212, a gap 24 is formed between them. The presence of the gap 24 increases the contact area between the airflow and the blade 20, meaning that more airflow can participate in the process of driving the blade 20 to rotate. This improves the wind turbine's power efficiency and helps reduce vortices formed at the blade's trailing edge 23. Reducing vortices helps reduce noise during operation. By changing the airflow path on the blade 20 surface, the gap 24 helps improve the airflow's adhesion and reduces airflow separation. Reducing airflow separation and vortex formation improves the overall efficiency of the axial flow wind turbine 100. It is understood that the shapes of the first section 211 and the second section 212 may vary depending on design requirements, but generally, they are both gradually changing in shape along the extension direction of the blade 20. The first section 211 may have a gradient shape, gradually shifting from the trailing edge 23 toward the side closer to the hub 10 until it connects with the second section 212. Its cross-sectional shape may be curved or optimized based on aerodynamic performance requirements. The second section 212 gradually extends from the first section 211 toward the side away from the hub 10 until it connects with the leading edge 22. Its cross-sectional shape may be curved or relatively straight, and may vary depending on design requirements.

[0045] Reference Figures 1 to 5 In an embodiment of the present invention, the axial-flow wind wheel 100 is used to cooperate with the air guide ring 30. The air guide ring 30 is coaxially sleeved on the outside of the axial-flow wind wheel 100. On a projection plane perpendicular to the axis of the hub 10, the inner edge radius of the air guide ring 30 is defined as r1. The point of the first section 211 closest to the hub 10 in the radial direction of the hub 10 is defined as the lowest point C of the blade tip 21. The point of the second section 211 farthest from the hub 10 in the radial direction of the hub 10 is defined as the highest point D of the blade tip 21. The straight-line distance between the highest point D of the blade tip 21 and the center point O of the hub 10 is defined as r2, and the straight-line distance between the lowest point C of the blade tip 21 and the center point O of the hub 10 is defined as r.

[0046] Among them, r1 is greater than r, and r1 is less than r2.

[0047] The lowest point C of the first section 211 is closer to the hub 10, meaning that the first section 211 is offset towards the hub 10, helping the airflow adhere better to the surface of the blade 20 and reducing airflow separation. The highest point D of the second section 212 is further away from the hub 10, which helps form the gap 24 and changes the flow characteristics of the airflow near the trailing edge 23, reducing the formation of vortices. r1 is greater than r, meaning that the inner radius r1 of the air guide ring 30 is greater than the straight-line distance r between the lowest point C of the blade tip 21 and the center point O of the hub 10. This ensures that the air guide ring 30 does not directly contact the blades 20 of the axial flow rotor 100, leaving sufficient clearance to avoid potential collisions during operation. r1 is less than r2, meaning that the inner radius r1 of the air guide ring 30 is less than the straight-line distance r2 between the highest point D of the blade tip 21 and the center point O of the hub 10. This is also to ensure sufficient clearance and ensure that airflow can pass smoothly through the space between the air guide ring 30 and the axial flow rotor 100. Since r<r1<r2, this means that the notch 24 is located within the range of the blade tip 21, but does not contact the air guide ring 30. This ensures that the presence of the notch 24 does not affect the airflow through the space between the air guide ring and the blade. This design ensures a reasonable fit between the axial flow wind wheel 100 and the air guide ring 30 by defining the distance between different points of the blade tip 21 and the center point O of the hub 10 and the inner edge radius r1 of the air guide ring 30. The definition and relationship of these dimensions ensure that the notch 24 can effectively improve the flow characteristics of the airflow, improve the efficiency of the axial flow wind wheel 100 and reduce noise without affecting the airflow between the axial flow wind wheel 100 and the air guide ring 30.

[0048] Reference Figures 1 to 5 In the embodiment of the present invention, the minimum distance between the axial flow impeller 100 and the air guide ring 30 is defined as L on a projection plane parallel to the axis of the hub 10;

[0049] Where L = r2-r.

[0050] In this embodiment, r2 defines the straight-line distance between the highest point D of the blade tip 21 and the center point O of the hub, which is the maximum radial dimension of the blade 20. r defines the straight-line distance between the lowest point C of the blade tip 21 and the center point O of the hub, which is the minimum radial dimension of the blade 20. L defines the minimum distance between the axial flow wind wheel 100 and the air guide ring 30, which is to ensure that there is sufficient clearance between the blade 20 and the air guide ring 30. The difference r2-r represents the radial variation of the blade tip 21 from the lowest point C to the highest point D, that is, the radial dimension variation range of the blade tip 21. L=r2-r means that the minimum distance L between the axial flow wind wheel 100 and the air guide ring 30 is equal to the radial dimension variation range of the blade tip 21. In other words, L is to ensure that even at the highest point D of the blade tip 21, the blade 20 will not contact the air guide ring 30, leaving sufficient clearance. The notch 24 helps to reduce the formation of vortices by changing the flow characteristics of the airflow near the trailing edge 23 of the blade. Since the smaller the gap 24 is, the closer the distance between the inner edge of the air guide ring 30 and the trailing edge 23 of the blade tip is, r2 is part of the position where the gap 24 is located. Therefore, even if the gap 24 is smaller, it is necessary to ensure that r2-r, that is, the minimum gap L between the axial flow wind wheel 100 and the air guide ring 30, is large enough to ensure safe operation, so that the highest point D of the blade tip 21 will not contact the air guide ring 30.

[0051] Reference Figures 1 to 5 In the embodiment of the present invention, L is not less than 3 mm and not more than 12 mm.

[0052] In this application, the numerical range of L is not less than 3 mm and not more than 12 mm in order to find a balance between ensuring safety and improving aerodynamic performance. A gap that is too small may cause contact between the blades 20 and the air guide ring 30, while a gap that is too large may affect aerodynamic performance. Therefore, the numerical range of L is not less than 3 mm and not more than 12 mm in order to ensure that there is sufficient safety gap between the axial flow impeller 100 and the air guide ring 30, while maintaining good aerodynamic performance and low noise. This range is selected based on a comprehensive consideration of factors such as safety, aerodynamic performance, and noise.

[0053] It can be understood that L = 3 mm is the minimum distance between the axial flow wind wheel 100 and the air guide ring 30. When L = 3 mm, this means that the minimum gap between the axial flow wind wheel 100 and the air guide ring 30 is exactly 3 mm. At this time, the cooperation between the axial flow wind wheel 100 and the air guide ring 30 has reached an optimal state, and the working efficiency of the axial flow wind wheel 100 is the highest, which means that the axial flow wind wheel 100 can reach its maximum power output. Therefore, when L = 3 mm, the gap between the wind wheel blades 20 and the air guide ring 30 is as small as possible, while maintaining a sufficient safety distance. In this state, the axial flow wind wheel 100 can make full use of its working area, improve efficiency, and at the same time maintain good aerodynamic performance and low noise.

[0054] Reference Figures 1 to 5 In the embodiment of the present invention, the difference between r2 and r1 is not less than 1 mm and not more than 3 mm.

[0055] The difference between r2 and r1 is not less than 1 mm, in order to ensure that there is sufficient safety clearance between the blade 20 and the air guide ring 30 under various working conditions to avoid any possible contact. 1 mm is a relatively small value, but it is sufficient to ensure basic safety. The difference between r2 and r1 is not greater than 3 mm, in order to ensure that while improving aerodynamic performance, excessive eddy currents or increased noise will not be introduced due to excessive clearance. Therefore, the difference between r2 and r1 is not less than 1 mm and not greater than 3 mm in order to ensure that there is sufficient safety clearance between the axial flow wind wheel 100 and the air guide ring 30, while maintaining good aerodynamic performance and low noise.

[0056] It can be understood that r2-r1=3 mm means that the difference between the highest point D of the blade tip 21 and the inner edge radius r1 of the air guide ring 30 is optimized to the optimal state, so that the gap between the wind wheel blade 20 and the air guide ring 30 is as small as possible, while maintaining a sufficient safety distance. At this time, the cooperation between the axial flow wind wheel 100 and the air guide ring 30 has reached an optimal state, and the working efficiency of the axial flow wind wheel 100 is the highest, which means that the axial flow wind wheel 100 can reach its maximum power output. Therefore, when r2-r1=3 mm, the minimum distance between the axial flow wind wheel 100 and the air guide ring 30 is optimized to the optimal state, which makes the gap between the wind wheel blade 20 and the air guide ring 30 as small as possible, while maintaining a sufficient safety distance. In this state, the axial flow wind wheel 100 can make full use of its working area, improve efficiency, and at the same time maintain good aerodynamic performance and low noise.

[0057] Reference Figures 1 to 5In an embodiment of the present invention, the air guide ring 30 is provided with a flange 31. In the projection plane perpendicular to the axis of the hub 10, the center of curvature of the flange 31 is defined as O1, the center of curvature of the first section 211 is defined as O2, and the center of curvature of the second section 212 is defined as O3, wherein O1, O2 and O3 are located on the same axis.

[0058] The air guide ring 30 is provided with a flange 31, which is a protruding part used to guide the airflow and improve the flow characteristics of the airflow. The center of curvature O1 of the flange 31, the center of curvature O2 of the first section 211, and the center of curvature O3 of the second section 212 are all located on the same axis. This axis is perpendicular to the axis of the hub 10. By positioning the centers of curvature of the flange 31, the first section 211, and the second section 212 on the same axis, it can be ensured that the cutting shape of the trailing edge of the blade tip is as consistent as possible with the shape swept by the air guide ring 30 during rotation, which helps the airflow to flow more smoothly when passing through the gap between the axial flow wind wheel 100 and the air guide ring 30, reducing airflow separation and the formation of vortices.

[0059] Reference Figures 1 to 6 The present invention further provides an axial flow fan, comprising the axial flow fan wheel 100 and a motor 200. The motor 200 is drivingly connected to the axial flow fan wheel 100 and configured to rotate the axial flow fan wheel 100. The specific structure of the axial flow fan wheel 100 is similar to that of the above-mentioned embodiments. Since the present axial flow fan utilizes all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which will not be described in detail here.

[0060] In this embodiment, the output shaft of the motor 200 is drivingly connected to the hub 10 of the axial-flow fan wheel 100. The motor 200 drives the axial-flow fan wheel 100 to rotate, causing air to flow in from the leading edges 23 of the blades 20. After the blades 20 generate work and generate a pressure rise, air flows out from the trailing edges 24 of the blades 20, thereby achieving a ventilation function. Furthermore, the design of the axial-flow fan wheel 100 improves fan efficiency, reducing power and noise while achieving the same air volume.

[0061] The present invention also provides an air supply device including an axial flow impeller 100 or an axial flow fan including the axial flow impeller 100. The specific structure of the axial flow impeller 100 is similar to the above-described embodiments. Since the present air supply device utilizes all the technical solutions of all the above-described embodiments, it at least has all the beneficial effects brought about by the technical solutions of the above-described embodiments, and therefore will not be further detailed here. The air supply device includes, but is not limited to, air conditioners, fans, air purifiers, dehumidifiers, humidifiers, and the like.

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

[0063] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An axial flow wind wheel, characterized in that: include: wheel hub; as well as The blade is arranged on the hub, and the blade has a blade top arranged away from the hub, and a leading edge and a trailing edge respectively arranged at both ends of the blade top, and a notch is provided on a side of the blade top close to the trailing edge.

2. The axial flow wind wheel according to claim 1, characterized in that: The blade tip has a first section and a second section connected to each other along its extension direction, the end of the first section away from the second section is connected to the trailing edge, the end of the second section away from the first section is connected to the leading edge, and the first section is offset relative to the second section toward the side close to the hub so that the gap is formed in the area between the first section and the second section.

3. The axial flow wind wheel according to claim 2, characterized in that: The axial flow wind wheel is used to cooperate with the air guide ring, and the air guide ring is coaxially sleeved outside the axial flow wind wheel. On the projection plane perpendicular to the axis of the hub, the inner edge radius of the air guide ring is defined as r1, the point of the first section closest to the hub in the radial direction of the hub is defined as the lowest point C of the blade tip, and the point of the second section farthest from the hub in the radial direction of the hub is defined as the highest point D of the blade tip. The straight-line distance between the highest point D of the blade tip and the center point O of the hub is defined as r2, and the straight-line distance between the lowest point C of the blade tip and the center point O of the hub is defined as r; Among them, r1 is greater than r, and r is less than r2.

4. The axial flow wind wheel according to claim 3, characterized in that: The minimum distance between the axial flow impeller and the air guide ring on a projection plane parallel to the hub axis is defined as L; Where L = r2-r.

5. The axial flow wind wheel according to claim 4, characterized in that: L is not less than 3 mm and not more than 12 mm.

6. The axial flow wind wheel according to claim 3, characterized in that: The difference between r2 and r1 is not less than 1 mm and not more than 3 mm.

7. The axial flow wind wheel according to any one of claims 3 to 6, characterized in that: The air guide ring is provided with a flange. In the projection plane perpendicular to the hub axis, the center of curvature of the flange is defined as O1, the center of curvature of the first section is defined as O2, and the center of curvature of the second section is defined as O3, wherein O1, O2 and O3 are located on the same axis.

8. An axial flow fan, characterized in that: The invention comprises a motor and an axial flow wind wheel according to any one of claims 1 to 7, wherein 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.

9. An air supply device, characterized in that: The invention comprises the axial flow wind wheel according to any one of claims 1 to 7, or comprises the axial flow fan according to claim 8.

10. The air supply device according to claim 9, wherein: The air supply device is an air conditioner, and the axial flow fan is provided on an outdoor unit and / or an indoor unit of the air conditioner.

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