WO2021243969A1

WO2021243969A1 - Fan blade, fan, air conditioner outdoor unit and air conditioner system

Info

Publication number: WO2021243969A1
Application number: PCT/CN2020/129502
Authority: WO
Inventors: 胡小文; 胡斯特; 詹东文; 张龙新; 李跃飞
Original assignee: 广东美的白色家电技术创新中心有限公司; 广东美的暖通设备有限公司; 美的集团股份有限公司
Priority date: 2020-06-01
Filing date: 2020-11-17
Publication date: 2021-12-09
Also published as: CN113757168A

Abstract

Disclosed are a fan blade, a fan, an air conditioner outdoor unit and an air conditioner system. The fan blade (100) comprises a hub (102); and blade bodies (104), wherein the blade bodies (104) are arranged on the hub (102), and each of the blade bodies (104) comprises a blade front edge (106) and a blade tail edge (108). In the radial direction of the hub (102), the contour line of the blade tail edge (108) comprises a first bent part (110) and a second bent part (112), the first bent part (110) protrudes towards the side that is away from the blade front edge (106), and the second bent part (112) protrudes towards the side of the blade front edge (106). According to the fan blade (100), the contour line of the blade tail edge (108) of each of the blade bodies (104) is designed to be of shape comprising the bent parts having opposite protruding directions, such that noise generated by leakage vortexes of the fan blade (100) itself is reduced, and noise generated by an interference effect generated by the leakage vortexes and other blade bodies (104) is also reduced, the fan efficiency is improved and the leakage flow is reduced, and furthermore, by means of such structure, damage being caused to the fan blade (100) due to a high load is prevented, the use stability of the fan blade (100) is improved, and the service life of the fan blade is prolonged.

Description

Fan blades, fans, air-conditioning outdoor units and air-conditioning systems

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on June 1, 2020 with the application number "202010483228.6" and the invention title "fan blades, fans, air-conditioning outdoor units and air-conditioning systems." The reference is incorporated in this application.

Technical field

This application relates to the technical field of household appliances, and specifically to a fan blade, a fan, an outdoor unit of an air conditioner, and an air conditioning system.

Background technique

At present, the counter-rotating blade design has been widely used in various fields. Its advantages are that it is compact in structure, has no guide vanes, and can generate two-stage static pressure. In this design, the downstream blades of the counter-rotating fan have relatively high relative speed and noise. Larger, and in most use cases where higher pressure needs to be increased, such as when cooling the condenser, higher pressure is often required. There is often an air guide ring structure in the counter-rotating fan. At this time, the noise of the counter-rotating fan is The largest source becomes the interference between the leakage vortex generated by the first-stage blade shape leakage and the upper part of the second-stage blade. There is a large pressure pulsation near the top of the second-stage leading edge, and at the same time it radiates Higher noise.

Summary of the invention

This application aims to solve at least one of the technical problems existing in the prior art or related technologies.

For this reason, the first aspect of this application proposes a fan blade.

The second aspect of the application proposes a fan blade.

The third aspect of this application proposes a fan.

The fourth aspect of the application proposes an outdoor unit of an air conditioner.

The fifth aspect of this application proposes an air conditioning system.

In view of this, the first aspect of the present application proposes a fan blade, including: a hub; blades, the blades are arranged on the hub, and along the rotation direction of the hub, the blades include a leading edge and a trailing edge of the blade on both sides of the blade. Wherein, along the radial direction of the hub, the contour line of the blade trailing edge includes a first bend and a second bend, the first bend is convex to the side away from the leading edge of the blade, and the second bend is toward the leading edge of the blade Bulge on one side.

The fan blade provided by the present application includes a hub and a blade. The blade is arranged on the peripheral side of the hub. The blade includes a leading edge of the blade on one side of the blade and a trailing edge of the blade on the other side of the blade. The contour line of the trailing edge of the blade includes two bends with opposite convex directions. Among them, the first bend is convex to the side away from the front edge of the blade, and the second bend is convex to the side of the front edge of the blade, which can significantly reduce The tip load reduces the flow of the undercurrent from the pressure surface to the suction surface, and inhibits the strength of the tip leakage vortex.

The fan blade provided by this application reduces the tip load and the flow rate of the undercurrent from the pressure surface to the suction surface by designing the contour line of the blade trailing edge of the blade to include two bends with opposite convex directions. The strength of the tip leakage vortex is realized, and the noise generated by the fan blade itself due to the leakage vortex is also reduced, and the noise caused by the interference between the leakage vortex and other blades is reduced, and the high noise caused by higher pressure pulsation is avoided. At the same time, the reduction of leakage flow improves fan efficiency. Furthermore, this structure also avoids damage to the structure of the fan blade due to the high load caused by the leakage vortex, and improves the stability and service life of the fan blade.

In addition, the fan blade in the above technical solution provided by this application may also have the following additional technical features:

In any of the above technical solutions, further, the blade further includes: a free end; a connecting end, the connecting end is connected with the hub; the middle section of the blade, the middle section of the blade is located between the connecting end and the free end; wherein the chord length of the free end is greater than The chord length of the middle section of the leaf and the connecting end.

In this technical solution, the free end chord length of the blade is set to be larger than the chord length of the middle section of the blade and the connecting end, which can further increase the wind power provided by the fan, so that the fan can be applied more widely, and the versatility of the fan is improved. At the same time, it reduces the tip load and the flow of the underflow from the pressure surface to the suction surface, suppresses the strength of the tip leakage vortex, reduces the fan noise, and improves the stability and service life of the fan blade.

In any of the above technical solutions, further, in the direction from the connecting end to the free end, the contour line of the leading edge of the blade gradually extends toward the front of the rotation direction of the hub.

In this technical solution, in the direction from the connecting end to the free end, the contour line of the leading edge of the blade is set to gradually extend toward the rotation direction of the hub, that is, a forward-curved structure is formed, so that the fan blade can adapt to the complex front of the blade. Edge airflow and reduce interference with other blades, further reducing fan noise.

In any of the above technical solutions, further, along the direction from the connecting end to the free end, the contour line of the trailing edge of the blade further includes a third bend, the third bend is connected to the second bend, and the third bend is further away One side of the leading edge of the blade is convex.

In this technical solution, by designing the contour line of the blade trailing edge of the blade to include three bends, and any two connected bends have different convex directions, the blade tip load is reduced and the pressure surface is reduced. The flow rate of the undercurrent on the suction surface suppresses the strength of the tip leakage vortex, reduces the noise generated by the leakage vortex, and also reduces the noise generated by the interference between the leakage vortex and other blades, avoiding higher pressure The problem of high noise caused by pulsation, and the reduction of leakage flow improves fan efficiency. Furthermore, this structure also avoids damage to the structure of the fan blade due to the high load caused by the leakage vortex, and improves the stability of the fan blade. Performance and service life.

According to the second aspect of the present application, a fan blade is also proposed, including: a hub; a blade, the blade is arranged on the hub, and along the rotation direction of the hub, the blade includes a blade leading edge and a blade trailing edge respectively located on both sides of the blade; Among them, along the first line between the intersection of the trailing edge of the blade and the hub and the axis of the hub, with the axis of the hub as the center, the radius of the circle between the intersection of the trailing edge of the blade and the axis of the hub The second line, as the radius R increases, the angle formed by the first line and the second line first increases and then decreases; the value of the radius R is larger than the radius of the hub and smaller than the free end of the blade to the shaft The distance from the heart.

For the fan blade provided in this application, the first line is specified by specifying the line between the intersection of the trailing edge of the blade and the hub and the axis of the hub as the first line; the circle with the hub’s axis as the center and the radius of R and the trailing edge of the blade is specified The line between the intersection point of and the axis of the hub is the second line. As the radius R increases, the angle formed by the first line and the second line first increases and then decreases, further optimizing the blade tail The structure design of the edge, the contour line of the trailing edge of the blade is a spoon-shaped structure, which reduces the tip load and the flow of the underflow from the pressure surface to the suction surface, suppresses the strength of the tip leakage vortex, and reduces its own leakage vortex generation. The noise also reduces the noise generated by the interference between the leakage vortex and other blades, avoids the problem of high noise caused by higher pressure pulsation, and at the same time reduces the leakage flow to improve the efficiency of the fan, and further avoids The high load caused by the leakage vortex causes damage to the structure of the fan blade itself, which improves the stability and service life of the fan blade.

In the above technical solution, further, the blade includes a connecting end and a free end, the connecting end is connected to the hub; the inflection point where the angle first increases and then decreases is located in the range of 60% to 90% of the blade height of the blade; wherein, The blade height is the distance from the connecting end to the free end along the radial direction of the hub.

In this technical solution, the inflection point where the included angle first increases and then decreases is set in the range of 60% to 90% of the blade height of the blade, so that the 60% to 90% load in the upper half is higher, forming a spoon The shape of the trailing edge structure can reduce the running speed of the fan when the fan reaches the same air volume and pressure level, so the speed of the fan rim is reduced, and the direct effect brought by the fan is to reduce the noise of the fan.

In any of the above technical solutions, further, from the connecting end to the free end, as the radius R decreases, the chord length of the blade corresponding to the radius R first decreases and then increases.

In this technical solution, from the connecting end to the free end, the chord length of the blade is set to a structure that first decreases and then increases as the radius R decreases, which further reduces the tip load and from the pressure surface to the suction surface The flow rate of the undercurrent suppresses the strength of the tip leakage vortex, reduces fan noise, improves fan efficiency, and improves the stability and service life of the fan blade. In addition, the design with a shorter middle chord length makes each blade more lightweight, thereby reducing the weight of the entire fan.

In any of the above technical solutions, further, the blade further includes: a middle blade section, which is located between the connecting end and the free end; wherein the chord length corresponding to the free end is greater than the chord length corresponding to the middle blade section and the connecting end.

In any of the above technical solutions, further, as the radius R increases, the angle formed by the first connection line and the second connection line first increases, then decreases, and then increases.

In this technical solution, as the radius R increases, the angle formed by the first connection line and the second connection line first increases, then decreases, and then increases. That is to say, the contour line of the trailing edge of the blade is set into multiple curved structures, and the angle between the connecting end and the free end of the blade has at least two inflection points, and the setting of such a curve realizes the reduction of the tip load and the reduction of the blade tip load. The flow rate of the undercurrent from the pressure surface to the suction surface suppresses the strength of the tip leakage vortex and reduces noise. At the same time, the reduction of the leakage flow rate improves the fan efficiency.

According to the third aspect of the present application, a fan is also proposed, including: a first-stage fan blade, the first-stage fan blade includes a fan blade as in any one of the above technical solutions; a second-stage fan blade; a drive assembly, a drive assembly Connected with the first-stage fan blade and the second-stage fan blade, where the first-stage fan blade and the second-stage fan blade rotate in opposite directions, the first-stage fan blade is the upstream fan blade, and the second-stage fan blade is the downstream fan blade Fan blade; along the direction of rotation of the first-stage fan blade, the leading edge of the blade of the first-stage fan blade is located in front of the trailing edge of the blade.

In the fan provided by the application, the drive assembly is connected with the first-stage fan blade and the second-stage fan blade, and the rotation direction of the first-stage fan blade and the second-stage fan blade are opposite, thereby realizing the counter-rotation of the second-stage fan , Can provide higher wind pressure. Further, along the inflow direction of the airflow, the first-stage fan blade located in the front is the upstream fan blade, and the second-stage fan blade located in the rear is the downstream fan blade. Among them, because the first-stage fan blade includes the fan blade of any of the above technical solutions, along the rotation direction of the first-stage fan blade, the leading edge of the blade of the first-stage fan blade is located in front of the trailing edge of the blade, thereby reducing The tip load and the flow of the undercurrent from the pressure surface to the suction surface suppress the strength of the tip leakage vortex, reduce the noise generated by the leakage vortex, and also reduce the interference between the leakage vortex and the second-stage fan blade. The noise generated avoids the problem of high noise caused by higher pressure pulsation. At the same time, the reduction of leakage flow also reduces the mechanical energy loss of the two-stage fan blade, which improves the efficiency of the fan. Furthermore, the fan also avoids The high load caused by the leakage vortex causes damage to the structure of the fan blade itself, which improves the stability and service life of the fan.

In the above technical solution, further, the second-stage fan blade includes the fan blade in any of the above-mentioned technical solutions; wherein, along the rotation direction of the second-stage fan blade, the leading edge of the blade of the second-stage fan blade is located on the blade The front of the film's trailing edge.

In this technical solution, since the second-stage fan blade includes the fan blade of any of the above-mentioned technical solutions, it has all the beneficial effects of the fan blade, and will not be repeated here.

In any of the above technical solutions, further, the drive assembly includes: a motor; a first output shaft, the first output shaft is connected to the motor, the output end of the first output shaft is connected to the first stage fan blade, and the first output The shaft has an axial through hole; the second output shaft, the second output shaft passes through the through hole, one end of the second output shaft is connected to the motor, and the other end of the second output shaft is connected to the second-stage fan blade; , The rotation direction of the first output shaft and the second output shaft are opposite.

In this technical solution, the drive assembly includes a motor, a first output shaft, and a second output shaft. Specifically, one end of the first output shaft is connected to the motor, and the output end is connected to the first-stage fan blades, so that the power of the motor is transmitted to the second output shaft. For the first-stage fan blade, the second output shaft passes through the axial through hole of the first output shaft by nesting connection. One end of the second output shaft is connected with the motor, and the output end is connected with the second-stage fan blade, so that the motor The power is transmitted to the second-stage fan blades, and makes it rotate in the opposite direction to the first-stage fan blade rotation direction, so that the second-stage fan blades form a counter-rotation and provide higher wind pressure.

In any of the above technical solutions, further, the drive assembly includes: a first motor; a first output shaft, the first output shaft is connected to the first motor, and the output end of the first output shaft is connected to the first-stage fan blade The second motor; the second output shaft, the second output shaft is connected with the second motor, the output end of the second output shaft is connected with the second stage fan blade; wherein, the rotation of the first output shaft and the second output shaft The direction is opposite.

In this technical solution, the drive assembly includes a first motor, a first output shaft, a second motor, and a second output shaft. Specifically, one end of the first output shaft is connected to the first motor, and the output end is connected to the first-stage fan blade. Connected so that the power of the first motor is transmitted to the first-stage fan blade to make it rotate. One end of the second output shaft is connected to the second motor, and the output end is connected with the second-stage fan blade, so that it faces the first-stage fan. The blades rotate in the opposite direction, so that the secondary fan blades form a counter-rotation, providing higher wind pressure, and the way of controlling each fan blade by two motors is modular and easier to implement.

Further, the outdoor unit of the air conditioner further includes a first motor support, and the first motor of the fan is arranged on the first motor support; and a second motor support, and the second motor of the fan is arranged on the second motor support. By arranging the first motor of the fan on the first motor support and the second motor of the fan on the second motor support, it is realized that the two motors of the fan are fixedly installed on the outdoor unit of the air conditioner without relative movement. The assembly of the fan and the outdoor unit of the air conditioner.

In any of the above technical solutions, further, the fan is projected along the direction of the axis of rotation of the first-stage fan blade, and the contour line of the trailing edge of the blade corresponding to the first-stage fan blade and the second-stage fan blade in the projection plane The intersection angle of the contour line of the leading edge of the blade corresponding to the blade is greater than 20°.

In this technical solution, in the projection plane where the fan is projected along the direction of the axis of rotation of the first-stage fan blade, the contour line of the trailing edge of the blade corresponding to the first-stage fan blade corresponds to the blade of the second-stage fan blade. The intersection angle of the leading edge contour line of the blade is greater than 20°, which can reduce the flow phase interference between the trailing edge of the first-stage fan blade and the leading edge of the second-stage fan blade to reduce interference noise.

According to the fourth aspect of the present application, an outdoor unit of an air conditioner is also proposed, including: a casing provided with an air outlet; an air guide ring arranged at the air outlet; and a fan as in any of the above technical solutions. It is arranged on the shell and located in the air guide ring.

Since the outdoor unit of the air conditioner provided in the present application includes the fan of any of the above technical solutions, it has all the beneficial effects of the fan, and will not be repeated here.

In the above technical solution, further, the outdoor unit of the air conditioner further includes a third-stage fan blade, and the third-stage fan blade is arranged on the wind guide ring and distributed along the inner circumference of the wind guide ring.

In this technical solution, by installing a third-stage fan blade in the outdoor unit of the air conditioner, the pressure of the fan can be further increased, the applicable range of the outdoor unit is wider, and the versatility of the outdoor unit of the air conditioner is improved.

In any of the above technical solutions, further, the third-stage fan blade is located between the first-stage fan blade and the second-stage fan blade; and/or the third-stage fan blade is located at the inlet of the first-stage fan blade and the air outlet Between ends

The third-stage fan blade is located between the second-stage fan blade and the outlet end of the air outlet.

In this technical solution, the third-stage fan blades can be arranged in various positions in the fan, which can further increase the pressure of the fan, and the first-stage fan blades and the second-stage fan blades include the fan blades of any of the above technical solutions, so it has All the beneficial effects of the fan blade will not be repeated here.

Further, the third-stage fan blade may be a static blade, or a dynamic blade having a fan blade of any of the above technical solutions.

According to the fifth aspect of the present application, an air conditioning system is also proposed, which includes: a fan as in any of the above technical solutions; or an air conditioner outdoor unit as in any of the above technical solutions.

The air conditioning system provided by the present application includes the fan of any of the above technical solutions or the air conditioner outdoor unit of any of the above technical solutions, and therefore has all the beneficial effects of the fan or the air conditioner outdoor unit, and will not be repeated here.

Description of the drawings

The above and/or additional aspects and advantages of the present application will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

Figure 1 shows a view of a fan blade according to an embodiment of the present application;

Figure 2 shows a left side view of the fan blade in the embodiment shown in Figure 1;

Figure 3 shows the relationship between the angle formed by the first line and the second line and the radius R of the fan blade in the embodiment shown in Figure 1;

Fig. 4 shows a schematic diagram of the leakage vortex structure of the fan blade in the embodiment shown in Fig. 1;

Figure 5 shows a view of a fan blade according to another embodiment of the present application;

Fig. 6 shows the relationship between the angle formed by the first line and the second line and the radius R of the fan blade in the embodiment shown in Fig. 5;

Fig. 7 shows a schematic structural diagram of a fan according to an embodiment of the present application;

Fig. 8 shows an axial view of the second stage fan blade in the embodiment shown in Fig. 7;

Fig. 9 shows a side view of the second stage fan blade in the embodiment shown in Fig. 7;

Figure 10 shows an axial view of the fan in the embodiment shown in Figure 7;

Fig. 11 shows a schematic structural diagram of an outdoor unit of an air conditioner according to an embodiment of the present application;

FIG. 12 shows a comparison diagram of the experimental data of the noise generated by the fan provided by the present application and the noise generated by the fan in the prior art.

Among them, the corresponding relationship between the reference signs and component names in Figures 1 to 11 is:

100 blades, 102 hub, 104 blades, 106 blade leading edge, 108 blade trailing edge, 110 first bend, 112 second bend, 114 connecting end, 116 free end, 118 blade middle section, 120 tip leakage vortex, 122 suction surface, 124 pressure surface, 126 third bend, 200 fan, 202 first stage fan blade, 204 second stage fan blade, 206 motor, 208 first output shaft, 210 second output shaft, 300 air conditioner outdoor unit , 302 shell, 304 air outlet, 306 wind guide ring.

detailed description

In order to be able to understand the above objectives, features and advantages of the application more clearly, the application will be further described in detail below with reference to the accompanying drawings and specific implementations. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other if there is no conflict.

In the following description, many specific details are set forth in order to fully understand this application. However, this application can also be implemented in other ways different from those described here. Therefore, the scope of protection of this application is not subject to the specific details disclosed below. Limitations of the embodiment.

Hereinafter, the fan blade 100, the fan 200 and the outdoor unit 300 of the air conditioner according to some embodiments provided in the present application will be described with reference to FIGS. 1 to 12.

Example one

As shown in FIGS. 1, 2 and 4, the first aspect of the present application proposes a fan blade 100, which includes a hub 102 and a blade 104, and the blade 104 is arranged on the hub 102.

The blade 104 includes a blade leading edge 106 and a blade trailing edge 108 located on both sides of the blade. Along the direction of rotation of the hub 102, the blade leading edge 106 is located in front of the blade trailing edge 108; wherein, along the radial direction of the hub 102, the blade tail The contour line of the edge 108 includes a first bend 110 and a second bend 112. The first bend 110 is convex toward the side away from the front edge 106 of the blade, and the second bend 112 is convex toward the side of the front edge 106 of the blade. .

The fan blade 100 provided by the present application includes a hub 102 and a plurality of blades 104. The plurality of blades 104 are arranged on the hub along the peripheral side of the hub 102. The blade 104 includes a blade leading edge 106 located in the forward direction of rotation and a rear edge. The trailing edge 108 of the blade. The contour line of the trailing edge 108 of the blade 104 includes two bends with opposite convex directions. The first bend 110 is convex toward the side away from the leading edge 106 of the blade, and the second bend 112 The bulge toward the front edge 106 of the blade can significantly reduce the tip load, reduce the flow of the undercurrent from the pressure surface 124 to the suction surface 122, and inhibit the tip leakage vortex 120.

The fan blade 100 provided in this application reduces the tip load and the pressure surface 124 to the suction surface 122 by designing the contour line of the blade trailing edge 108 of the blade 104 to include two bends with opposite convex directions. The flow rate of the submerged flow suppresses the flow intensity of the tip leakage vortex 120, and reduces the noise generated by the blade itself due to the tip leakage vortex 120, and also reduces the noise caused by the interference generated by the leakage vortex and other blades. The problem of high noise caused by higher pressure pulsation, and the reduction of leakage flow improves the fan efficiency. Further, this structure also avoids damage to the fan blade itself due to the high load caused by the leakage vortex, and improves the fan The stability and service life of the leaf.

Example two

As shown in Figure 1, Figure 2, Figure 3 and Figure 4, the present application provides a fan blade 100, including: a hub 102, a blade 104; wherein the blade 104 is disposed on the hub 102, and the blade 104 includes one side of the blade. The leading edge 106 of the blade and the trailing edge 108 on the other side of the blade; wherein, along the radial direction of the hub 102, the contour line of the trailing edge 108 of the blade includes a first bend 110 and a second bend 112, the first bend The portion 110 protrudes to a side away from the front edge 106 of the blade, and the second bent portion 112 protrudes toward a side of the front edge 106 of the blade.

Further, as shown in FIG. 1, the blade includes a connecting end 114 and a free end 116, the connecting end 114 is connected to the hub 102; the middle blade section 118, which is located between the connecting end 114 and the free end 116; wherein, the free end 116 The corresponding chord length is greater than the chord length corresponding to the middle section 118 and the connecting end 114 of the blade.

In this embodiment, by arranging the blade 104 to have a structure in which the chord length of the free end 116 is greater than the chord length of the middle section 118 and the connecting end 114 of the blade, the wind power that the fan can provide can be further increased, and the applicable range of the fan can be more extensive. The versatility of the fan, while reducing the tip load and the flow of the underflow from the pressure surface 124 to the suction surface 122, suppressing the flow intensity of the tip leakage vortex 120, reducing fan noise, and improving the stability and use of the fan blade life.

In any of the above embodiments, as shown in FIG. 1, further, from the connecting end 114 to the free end 116, the contour line of the leading edge 106 of the blade gradually extends toward the front of the rotation direction of the hub 102.

In this embodiment, in the direction from the connecting end 114 to the free end 116, the contour line of the leading edge 106 of the blade is set to gradually extend toward the rotation direction of the hub 102, that is, a forward-curved structure is formed. It adapts to the complicated airflow at the leading edge of the blade and reduces interference with other blades, further reducing fan noise.

Further, as shown in FIG. 5, in an implementation of the present application, along the direction from the connecting end 114 to the free end 116, the contour line of the blade trailing edge 108 further includes a third bend 126, a third bend 126, and a second bend. The bent portions 112 are connected, and the third bent portion 126 protrudes toward a side away from the front edge 106 of the blade.

In this technical solution, the contour line of the blade trailing edge 108 of the blade 104 is designed to include three bends, and any two connected bends have different convex directions, and a plurality of concave and convex bends are provided. , The air flow from the free end to the connecting end of the blade can be adjusted, thereby reducing the tip load and the flow rate of the submerged flow from the pressure surface 124 to the suction surface 122, thereby reducing the flow intensity of the leakage vortex.

Example three

The second aspect of the present application proposes a fan blade 100, which includes a hub 102 and a blade 104. The blade 104 is arranged on the hub 102. The blade 104 includes a blade leading edge 106 and a blade trailing edge 108 located on both sides of the blade. The leading edge 106 of the blade is located in front of the trailing edge 108 of the blade.

Among them, as shown in Figures 1 to 4, along the first line a between the intersection of the blade trailing edge 108 and the hub 102 and the axis of the hub 102, a circle with the axis of the hub 102 as the center and a radius of R The second line b between the intersection with the trailing edge 108 of the blade and the axis of the hub 102, as the radius R increases, the angle β formed by the first line and the second line first increases and then decreases The value of the radius R is larger than the radius of the hub 102 and smaller than the distance from the free end 116 to the axis. Through the above setting, the structural design of the blade trailing edge 108 is further optimized. The contour line of the blade trailing edge 108 is a spoon-shaped structure, The tip load and the flow of the underflow from the pressure surface 124 to the suction surface 122 are reduced, the strength of the tip leakage vortex 120 is suppressed, and the noise generated by the tip leakage vortex 120 is reduced, and the leakage vortex and others are also reduced. The noise generated by the interference generated by the blades avoids the problem of high noise caused by higher pressure pulsation. At the same time, the reduction of leakage flow improves the efficiency of the fan, and further avoids the high load caused by the leakage vortex. The structure of the blade itself causes damage, which improves the stability and service life of the fan blade.

Further, as shown in Figure 1, the blade includes a connecting end 114 and a free end 116, the connecting end 114 is connected to the hub 102; the inflection point where the angle β first increases and then decreases is located at 60% to 90% of the blade height of the blade In the interval; wherein, the blade height is the distance between the connecting end 114 and the free end 116 along the radial direction of the hub 102.

In this embodiment, the inflection point at which the angle β first increases and then decreases is set in the range of 60% to 90% of the blade height of the blade 104, so that the 60% to 90% load in the upper half is higher, Forming a spoon-shaped trailing edge structure can reduce the running speed of the fan when the fan reaches the same air volume and pressure level. Therefore, the speed of the fan rim is reduced, and the direct effect brought by the fan is to reduce the noise of the fan.

Further, as shown in FIG. 1, from the free end 116 to the connecting end 114, as the radius R decreases, the chord length of the blade 104 corresponding to the radius R first decreases and then increases.

In this embodiment, from the free end 116 to the connecting end 114, the chord length of the blade 104 is set to a structure that first decreases and then increases as the radius R decreases, which further reduces the tip load and the pressure surface 124 The flow of the undercurrent to the suction surface 122 suppresses the strength of the tip leakage vortex 120, reduces fan noise, improves fan efficiency, and improves the stability and service life of the fan blade. In addition, the design with a shorter middle chord length can make each blade 104 lighter, thereby reducing the weight of the entire fan.

Further, the blade 104 further includes: a mid-leaf section 118 located between the connecting end 114 and the free end 116; wherein the chord length corresponding to the free end 116 is greater than the chord length corresponding to the mid-leaf section 118 and the connecting end 114.

In this embodiment, by arranging the blade 104 to have a structure in which the chord length of the free end 116 is greater than the chord length of the middle section 118 and the connecting end 114 of the blade, the wind power that the fan can provide can be further increased, and the applicable range of the fan can be more extensive. The versatility of the fan, while reducing the tip load and the flow of the underflow from the pressure surface 124 to the suction surface 122, suppressing the strength of the tip leakage vortex 120, reducing fan noise, and improving the stability and service life of the fan blade .

Further, as shown in FIG. 6, as the radius R increases, the angle formed by the first line a and the second line b first increases, then decreases, and then increases. That is, the contour line of the trailing edge 108 of the blade is set into a plurality of curved structures, and the angle between the connecting end 114 and the free end 116 of the blade 104 has at least two inflection points, and the lowering of the blade is achieved through such a curve setting. The top load and the flow of the underflow from the pressure surface to the suction surface suppress the strength of the tip leakage vortex and reduce the noise. At the same time, the reduction of the leakage flow improves the fan efficiency.

Embodiment four

According to the third aspect of the present application, as shown in FIG. 7, FIG. 8, FIG. 9, and FIG. 10, a fan 200 is also proposed, including: a first stage fan blade 202, the first stage fan blade 202 includes any of the above The fan blade 100 and the second-stage fan blade 204 of an embodiment; a drive assembly, which is connected to the first-stage fan blade 202 and the second-stage fan blade 204, wherein the first-stage fan blade 202 and the second-stage fan The direction of rotation of the blades 204 is opposite, the first-stage fan blade 202 is the upstream fan blade, and the second-stage fan blade 204 is the downstream fan blade; along the rotation direction of the first-stage fan blade, the leading edge of the blade of the first-stage fan blade Located in front of the trailing edge of the blade.

In this embodiment, the drive assembly is connected with the first-stage fan blade 202 and the second-stage fan blade 204, and the rotation direction of the first-stage fan blade 202 and the second-stage fan blade 204 are opposite, thereby realizing the second-stage fan blade. The counter-rotation of the fan can provide a higher wind pressure. Specifically, the arrows in FIG. 1 and FIG. 8 respectively show the direction of rotation of the first-stage fan blade 202 and the second-stage fan blade 204. Further, along the direction of the airflow, the first-stage fan blade 202 located in the front is an upstream fan blade, and the second-stage fan blade 204 located in the rear is a downstream fan blade. Among them, since the first stage fan blade 202 includes the fan blade 100 of any of the above embodiments, along the rotation direction of the first stage fan blade, the leading edge of the blade of the first stage fan blade is located in front of the trailing edge of the blade, thereby realizing It reduces the tip load and the flow of the underflow from the pressure surface to the suction surface, suppresses the strength of the tip leakage vortex, reduces the noise generated by the tip leakage vortex, and also reduces the tip leakage vortex and the second stage fan The noise generated by the interference produced by the blade 204 avoids the problem of high noise caused by higher pressure pulsation. At the same time, the reduction of leakage flow also reduces the mechanical energy loss of the two-stage fan blade, which improves the efficiency of the fan. Ground, the fan also avoids damage to the structure of the fan blade due to the high load caused by the leakage vortex, and improves the stability and service life of the fan.

Further, as shown in FIGS. 8 and 9, the second-stage fan blade 204 includes the fan blade 100 in any of the above technical solutions; wherein, along the rotation direction of the second-stage fan blade, the fan of the second-stage fan blade The leading edge of the leaf is located in front of the trailing edge of the leaf.

In this embodiment, since the second-stage fan blade 204 includes the fan blade 100 of any one of the above embodiments, it has all the beneficial effects of the fan blade, and will not be repeated here.

Further, as shown in FIG. 7, the drive assembly in one embodiment includes: a motor 206; a first output shaft 208, the first output shaft 208 is connected to the motor 206, and the output end of the first output shaft 208 is connected to the first stage fan The blades 202 are connected, the first output shaft 208 has an axial through hole; the second output shaft 210, the second output shaft 210 passes through the through hole, one end of the second output shaft 210 is connected to the motor 206, and the second output shaft The other end of 210 is connected with the second-stage fan blade 204; wherein, the rotation directions of the first output shaft 208 and the second output shaft 210 are opposite.

In this implementation, the drive assembly includes a motor 206, a first output shaft 208, and a second output shaft 210. Specifically, one end of the first output shaft 208 is connected to the motor 206, and the output end is connected to the first-stage fan blade 202, so that the motor The power of 206 is transmitted to the first-stage fan blade 202, the second output shaft 210 is inserted into the axial through hole of the first output shaft 208 through a nested connection, and one end of the second output shaft 210 is connected to the motor 206 to output The end is connected to the second-stage fan blade 204, so that the power of the motor 206 is transmitted to the second-stage fan blade 204, and it is rotated in the direction opposite to the rotation direction of the first-stage fan blade 202, so that the second-stage fan blades form a pair of Spin to provide higher wind pressure.

Further, in another embodiment, the drive assembly includes: a first motor; a first output shaft, the first output shaft is connected to the first motor, and the output end of the first output shaft is connected to the first stage fan blade; Two motors; the second output shaft, the second output shaft is connected with the second motor, and the output end of the second output shaft is connected with the second stage fan blade; wherein the rotation directions of the first output shaft and the second output shaft are opposite . Specifically, one end of the first output shaft is connected to the first motor, and the output end is connected to the first-stage fan blade, so that the power of the first motor is transmitted to the first-stage fan blade to rotate it, and one end of the second output shaft is connected to the first stage fan blade. The two motors are connected, and the output end is connected with the second-stage fan blade, and it is rotated in the direction opposite to the first-stage fan blade rotation direction, so that the second-stage fan blade forms a counter-rotation to provide higher wind pressure and pass The way that two motors control each fan separately is modular and easier to implement.

Further, in this embodiment, the outdoor unit of the air conditioner further includes a first motor support, the first motor of the fan is arranged on the first motor support; and the second motor support, the second motor of the fan is arranged on the second motor support. By arranging the first motor of the fan on the first motor support and the second motor of the fan on the second motor support, it is realized that the two motors of the fan are fixedly installed on the outdoor unit of the air conditioner without relative movement. The assembly of the fan and the outdoor unit of the air conditioner.

Further, as shown in FIG. 10, the fan is projected along the direction of the axis of rotation of the first-stage fan blade, and the trailing edge contour line 108 of the blade of the first-stage fan blade 202 and the second-stage fan blade 204 are in the projection plane. The intersection angle of the contour lines of the blade leading edge 106 of the blade is greater than 20°.

In this embodiment, the fan is projected along the direction of the axis of rotation of the first-stage fan blade. The intersection angle of the outline of the leading edge 106 of the blade corresponding to the blade of 204 is greater than 20°, which can reduce the flow phase interference between the trailing edge 108 of the first-stage fan blade 202 and the leading edge 106 of the second-stage fan blade 204. To reduce interference noise. Specifically, the intersection angle refers to the angle formed between the contour line 108 of the trailing edge of the blade corresponding to the first stage fan blade 202 and the tangent to the contour line of the leading edge 106 of the second stage fan blade 204 corresponding to the cross state. .

Embodiment five

According to the fourth aspect of the present application, as shown in FIG. 11, an outdoor unit 300 of an air conditioner is also proposed, including: a housing 302 provided with an air outlet 304; an air guide ring 306 arranged at the air outlet 304; As well as the fan 200 of any of the above technical solutions, the fan 200 is disposed on the housing 302 and located in the air guide ring 306.

In this embodiment, since the fan 200 of any of the above technical solutions is included, it has all the beneficial effects of the fan 200, which will not be repeated here.

Furthermore, the outdoor unit of the air conditioner further includes a third-stage fan blade (not shown in the figure), and the third-stage fan blade is arranged on the wind guide ring 306 and distributed along the inner circumference of the wind guide ring 306.

In this embodiment, by providing the third-stage fan blades in the outdoor unit 300 of the air conditioner, the pressure of the fan can be further increased, the applicable range of the outdoor unit is wider, and the versatility of the outdoor unit of the air conditioner is improved.

Further, the third-stage fan blade (not shown in the figure) is located between the first-stage fan blade 202 and the second-stage fan blade 204; and/or the third-stage fan blade is located between the first-stage fan blade 202 and the air outlet Between the inlet end of 304; the third-stage fan blade is located between the second-stage fan blade 204 and the outlet end of the air outlet 304.

In this embodiment, the third-stage fan blades can be arranged in various positions in the fan 200 to further increase the fan pressure, and the first-stage fan blades 202 and the second-stage fan blades 204 include the fan blades of any of the above embodiments. 100. Therefore, it has all the beneficial effects of the fan blade, which will not be repeated here.

Further, the third-stage fan blades may be static blades or dynamic blades having the fan blades of any of the above embodiments.

Specific embodiment

In this embodiment, a fan structure is provided. As shown in FIGS. 7 to 10, the fan structure is specifically a counter-rotating fan structure, including: a motor 206, a first-stage fan blade 202, a second-stage fan blade 204, and a motor 206 extends two inner and outer main shafts, namely the first output shaft 208 and the second output shaft 210. The rotation directions of the two shafts that drive the fan are opposite. The two-stage fan blades are matched with the inner holes of the fan blades The torque is transmitted, and the axial position is locked by the lock nut in the axial direction.

Fig. 1 shows a structural diagram of the first-stage fan blade 202 of the fan 200, which mainly includes a plurality of circumferentially arranged blades 104 and a hub 102 around a central axis. The blade 104 is divided into the leading edge of the blade (ie, the leading edge of the blade 106) and the trailing edge of the blade (ie the trailing edge of the blade 108) according to the airflow direction, and the root region (ie the connecting end 114) is divided into the root region (ie the connecting end 114) according to the trailing edge of the blade along the direction of the increase in the height of the blade. , The middle section of the blade 118 and the tip area (i.e. the free end 116), and define the trailing edge wrap angle β of the blade as the first line between the intersection of the trailing edge of the blade and the hub 102 and the axis and the axis of the hub 102 as the center of the circle, The angle β formed by the intersection of a circle with a radius R and the contour line of the trailing edge and the axis of the hub 102.

As shown in FIGS. 1 to 4, the blade 104 has the following structural features. First, as shown in FIG. Extend forward to form a forward-curved structure to adapt to the complicated front-edge airflow.

Secondly, the trailing edge wrap angle β formed by the blade trailing edge profile structure has the characteristics shown in FIG. As shown in the figure, the trailing edge wrap angle β angle is small at a small radius. As the radius R increases, the β angle gradually increases, and an inflection point appears near the upper half of the leaf height interval of about 60% to 90%. When the diameter further increases The trailing edge line wrap angle β angle appears to decrease. This design structure forms a spoon-shaped structure as shown in Figure 1 on the trailing edge contour line.

Finally, the chord length of the blade corresponding to the arcs intercepted by concentric circles of different radii of the blade 104 starts from the free end 116, and the chord length decreases rapidly as the radius R decreases. Then, as the radius R decreases, the chord length of the blade 104 increases again. The blade chord length refers to the axial section of the fan blade by a circle with the hub axis as the center and the radius R, and the blade chord length corresponding to the arc at the circular section.

This design technology is mainly considered from the following aspects. When the airflow passes through the first-stage fan blade 202, the pressure surface 124 and the suction surface 122 have the characteristics of high pressure and low pressure, respectively. An underflow from the pressure surface 124 to the suction surface 122 is formed at the top of the blade. And the tip leakage vortex 120 is formed from the leading edge of the blade, as shown in FIG. 4. With the air guide ring, the tip leakage vortex 120 is separated from the blade due to the scraping effect of the air guide ring. The tip leakage vortex 120 of the first stage fan blade 202 develops downstream, and the front of the second stage fan blade 204 The edge interferes and produces strong aerodynamic noise. In order to reduce the strong aerodynamic noise caused by the tip leakage vortex 120, the longer chord length design of the leading edge of the blade structure shown in Fig. 1 is larger than the other radius chord length design of the upper middle part and the trailing edge wrap angle β as shown in the figure. The special design shown in 3 can significantly reduce the tip load, reduce the flow of the underflow from the pressure surface 124 to the suction surface 122, and inhibit the strength of the tip leakage vortex 120. In addition to the reduction of the leakage vortex intensity of the first-stage fan blade 202, the effect brought about by this is also suppressed by the interference effect of the blade leading edge 106 of the second-stage fan blade 204, thereby bringing about the low-noise characteristics of the counter-rotating fan. At the same time, the decrease in leakage flow will also increase the efficiency of the fan.

Figures 8 and 9 show the structure of the second-stage fan blade 204. Like the first-stage fan blade 202, the front edge of the second-stage fan blade 204 extends forward along the direction of rotation when viewed from the axial direction. The design mainly considers the matching with the first-stage fan blade 202. The rotation directions of the first-stage fan blade 202 and the second-stage fan blade 204 are opposite, and the trailing edge of the first-stage fan blade 202 generally extends forward along the rotation direction. Therefore, the crossing angle of the trailing edge of the first-stage fan blade 202 and the leading edge of the second-stage fan blade 204 is designed to be as large as possible as shown in FIG. 10, which is usually greater than 20°. This design can also reduce the flow phase interference between the trailing edge of the first-stage fan blade 202 and the leading edge of the second-stage fan blade 204, and reduce interference noise. The trailing edge of the second-stage fan blade 204 is the same as the trailing edge of the first-stage fan blade 202, and has the same characteristics of the trailing edge wrap angle as shown in FIG. 3. At a small radius, the trailing edge wrap angle β is small, and gradually increases as the radius increases. An inflection point appears near the upper half of about 60% to 90% of the leaf height. When the diameter further increases, the trailing edge wrap angle β angle decreases. This design structure forms a spoon-shaped structure as shown in Fig. 8 on the trailing edge of the downstream fan blade. And the chord length of the second-stage fan blade 204 starts from the free end 116, the chord length decreases rapidly as the radius decreases, and the chord length increases again as the radius decreases. This structural design can also reduce the strength of the tip leakage vortex 120 of the second-stage fan blade 204, reduce the aerodynamic noise generated by the two-stage flow interference of the fan 200, and improve the efficiency.

Further, the counter-rotating fan is not limited to the two-stage counter-rotation, and can also be provided with three-stage or more counter-rotation, and each stage of the fan blade may include the fan blade 100 of the above-mentioned embodiment.

The low-noise blade structure design of a counter-rotating fan proposed in this application can bring about the following main beneficial effects:

First of all, the technical solution of the present application adopts the characteristic design of the trailing edge wrap angle β as shown in Fig. 3, and an inflection point appears near the upper half of the leaf height range of about 60% to 90%, and the trailing edge line forms a spoon-shaped structure. The biggest advantage of this design is that the load of the blade is concentrated in the upper half of about 60% to 90% of the blade height, and the blade height profile line uses a lower load above 90%, and the length of the chord length in the tip area Longer. A longer chord length in the tip area can reduce the load on both sides of the blade in the tip area, and reduce the strength of the tip leakage subsurface flow caused by the pressure difference from the pressure surface to the suction surface. Not only is it beneficial to reduce the noise generated by the single-stage tip leakage vortex 120, but it can also reduce the interference between the flow developed by the leakage vortex and the flow of the second-stage fan blade 204, resulting in a reduction in the two-stage interference aerodynamic noise. At the same time, the reduction of the tip leakage vortex 120 also reduces the loss of the two-stage rotor, improves the fan efficiency and reduces the power consumption.

Specifically, as shown in FIG. 12, the experimental data comparison diagram of the noise generated by the fan provided by the present application and the noise generated by the fan in the prior art obtained through experiments, wherein the abscissa is the actual flow rate and the measured actual flow rate corresponding to different rotation speeds. Set the flow value ratio, and the ordinate is the corresponding measured noise value. It can be clearly seen that the noise generated by this application is significantly lower than the noise of the fan in the prior art under the condition of the same rotation speed.

Secondly, the structure formed by the technical solution of the present application has a higher load of about 60% to 90% in the upper half, forming a spoon-shaped trailing edge structure, which can reduce the operating speed of the fan when the fan reaches the same air volume and pressure level, so the fan wheel The direct effect of the reduced edge speed is that the noise of the fan is reduced.

The leading edge of the last two stages of blade design extends forward along the direction of rotation from the axial view, forming a forward curved structure to adapt to the complicated leading edge airflow, reducing the interference caused by the trailing edge of the first stage fan blade 202, which is beneficial In order to improve the two-stage matching, the fan 200 with lower noise is obtained.

Further, the counter-rotating fan provided in the present application can not only be applied to the outdoor unit of a central air conditioner, but also applicable to other scenarios such as an outdoor unit of a household air conditioner, an inner unit of a household air conditioner, etc., which generate air delivery.

In the description of the present application, the term "plurality" refers to two or more than two, unless clearly defined otherwise, the orientation or positional relationship indicated by the terms "upper", "lower", etc. are those based on the attached drawings. The relationship is only for the convenience of describing the application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the application; the term "connected" "," "installation", "fixed", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. . For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

In the description of this application, the descriptions of the terms "one embodiment", "some embodiments", "specific embodiments", etc. mean that specific features, structures, materials, or characteristics described in conjunction with the embodiment or examples are included in this application In at least one embodiment or example. In this application, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

The above are only preferred embodiments of the application, and are not used to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

A fan blade, which includes:

Wheel hub

A blade, the blade is arranged on the hub, and along the rotation direction of the hub, the blade includes a blade leading edge and a blade trailing edge respectively located on both sides of the blade;

Wherein, along the radial direction of the hub, the contour line of the trailing edge of the blade includes a first bend and a second bend, and the first bend is convex toward a side away from the leading edge of the blade, so The second bent portion protrudes toward one side of the front edge of the blade.
The fan blade according to claim 1, wherein the blade comprises:

Free end

A connecting end, the connecting end is connected to the hub;

The middle section of the leaf, the middle section of the leaf is located between the connecting end and the free end;

Wherein, the chord length of the free end position of the blade is greater than the chord length of the middle section of the blade and the connection end position.
The fan blade according to claim 2, wherein:

From the connecting end to the free end, the contour line of the leading edge of the blade extends toward the front of the rotation direction of the hub.
The fan blade according to claim 2 or 3, wherein:

Along the direction from the connecting end to the free end, the contour line of the trailing edge of the blade further includes a third bend, the third bend is connected to the second bend, and the third bend is directed toward The side away from the leading edge of the blade is convex.
A fan blade in which,

Wheel hub

A blade, the blade is arranged on the hub, and along the rotation direction of the hub, the blade includes a blade leading edge and a blade trailing edge respectively located on both sides of the blade;

Wherein, along the first line between the intersection of the trailing edge of the blade and the hub and the axis of the hub, a circle with a radius of R and the axis of the hub is the center of the circle and the trailing edge of the blade The second line between the intersection point of and the axis of the hub, as the radius R increases, the angle formed by the first line and the second line first increases and then decreases ；

The value of the radius R is larger than the radius of the hub and smaller than the distance from the free end of the blade to the shaft center.
The fan blade according to claim 5, wherein:

The blade includes a connecting end and the free end, and the connecting end is connected with the hub;

The inflection point at which the included angle first increases and then decreases is located in an interval of 60% to 90% of the blade height of the blade;

Wherein, the blade height is the distance between the connecting end and the free end along the radial direction of the hub.
The fan blade according to claim 6, wherein:

From the free end to the connecting end, as the radius R decreases, the chord length of the blade at the position of the radius R first decreases and then increases.
The fan blade according to claim 6, wherein the blade further comprises:

The middle section of the leaf, the middle section of the leaf is located between the connecting end and the free end;

Wherein, the chord length of the free end position of the blade is greater than the chord length of the middle section of the blade and the connection end position.
The fan blade according to any one of claims 6 to 8, wherein:

From the connecting end to the free end, the contour line of the leading edge of the blade extends toward the front of the rotation direction of the hub.
The fan blade according to any one of claims 5 to 8, wherein:

As the radius R increases, the angle formed by the first line and the second line first increases, then decreases, and then increases.
A fan, which includes:

The first-stage fan blade, the first-stage fan blade includes the fan blade according to any one of claims 1 to 4 or the fan blade according to any one of claims 5 to 10;

Second stage fan blades;

A drive assembly, the drive assembly is connected with the first-stage fan blade and the second-stage fan blade;

Wherein, the rotation directions of the first-stage fan blade and the second-stage fan blade are opposite, the first-stage fan blade is an upstream fan blade, and the second-stage fan blade is a downstream fan blade;

In the direction of rotation of the first-stage fan blade, the leading edge of the blade of the first-stage fan blade is located in front of the trailing edge of the blade.
The fan according to claim 11, wherein:

The second-stage fan blade includes the fan blade according to any one of claims 1 to 4 or the fan blade according to any one of claims 5 to 10;

Wherein, along the rotation direction of the second-stage fan blade, the leading edge of the blade of the second-stage fan blade is located in front of the trailing edge of the blade.
The fan according to claim 12, wherein:

The fan is projected along the direction of the rotation axis of the first-stage fan blade, and the contour line of the trailing edge of the blade corresponding to the first-stage fan blade in the projection plane corresponds to the blade of the second-stage fan blade The intersection angle of the contour lines of the leading edge of the blade is greater than 20°.
An outdoor unit of an air conditioner, which includes:

A housing, the housing is provided with an air outlet;

The air guide ring is arranged at the air outlet; and

The fan according to any one of claims 11 to 13, wherein the fan is arranged on the casing and located in the wind guide ring.
The air conditioner outdoor unit according to claim 14, further comprising:

The third-stage fan blades are arranged on the air guide ring and distributed along the circumference of the inner ring of the air guide ring.
The air conditioner outdoor unit according to claim 15, wherein:

The third-stage fan blade is located between the first-stage fan blade and the second-stage fan blade; and/or

The third-stage fan blade is located between the first-stage fan blade and the inlet end of the air outlet; and/or

The third-stage fan blade is located between the second-stage fan blade and the outlet end of the air outlet.
An air conditioning system, which includes:

The fan according to any one of claims 11 to 13; or

The air conditioner outdoor unit according to any one of claims 14 to 16.