Fan blade structure, axial flow fan and air conditioner

Abstract

The utility model discloses a fan blade structure, an axial flow fan and an air conditioner, and relates to the technical field of electrical equipment, and the fan blade structure comprises a hub, fan blades and a water beating ring; the fan blades are arranged on the outer edge of the hub; the water beating ring is arranged on the periphery of the fan blades and connected with the fan blades. And guide vanes are arranged on the inner side wall or the outer side wall of the water beating ring. According to the technical scheme, the air volume of the axial flow fan can be increased, so that the heat exchange capacity is improved, and the working efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and in particular to a fan blade structure, an axial flow fan, and an air conditioner. Background Technology

[0002] Window air conditioners have a huge market due to their ease of installation and small footprint. Window air conditioners have a compact structure, integrating the indoor and outdoor units. The outdoor unit typically uses an axial flow fan, while the indoor unit often uses a cross-flow or centrifugal fan. However, due to size limitations, the axial flow fan blades on the outdoor unit are often small, resulting in lower airflow, insufficient heat exchange capacity, and low operating efficiency. Utility Model Content

[0003] The main purpose of this utility model is to propose a fan blade structure, an axial flow fan, and an air conditioner, which aims to increase the air volume of the axial flow fan to improve its heat exchange capacity and thus improve its working efficiency.

[0004] To achieve the above objectives, this utility model proposes a wind turbine blade structure, comprising:

[0005] Wheel hub;

[0006] The fan blades are located on the outer edge of the hub;

[0007] A water-spraying ring is located around the fan blade and connected to the fan blade; the inner and / or outer walls of the water-spraying ring are provided with guide vanes.

[0008] In one embodiment of this application, a reinforcing ring is provided around the water-spraying ring, and the guide vane is disposed between the water-spraying ring and the reinforcing ring.

[0009] In one embodiment of this application, the guide vane is an arc-shaped plate or a flat plate.

[0010] In one embodiment of this application, the angle between the tangent at the end of the guide vane near the air inlet side of the fan blade and the rotation direction of the guide vane is defined as θ1, which satisfies: θ1>90°.

[0011] In one embodiment of this application, the angle between the tangent at the end of the guide vane away from the air inlet side of the fan blade and the rotation direction of the guide vane is defined as θ2, which satisfies: θ2≥90°.

[0012] In one embodiment of this application, the inner and / or outer walls of the water jet ring are provided with a plurality of guide vanes spaced apart circumferentially.

[0013] In one embodiment of this application, the water jet ring is axially connected to the trailing edge of the fan blade.

[0014] To achieve the above objectives, this utility model also proposes an axial flow fan, comprising:

[0015] Motor bracket;

[0016] The rear panel is located on the motor bracket;

[0017] An air guide ring is located on the rear panel;

[0018] As described above, the fan blade structure is located inside the air guide ring.

[0019] To achieve the above objectives, this utility model defines the height of the guide vane in the radial direction of the water-spraying ring as H, the inner wall diameter of the guide ring as D1, and the outer diameter of the fan blade as D2, thus satisfying: H≥0.5(D1-D2).

[0020] To achieve the above objectives, the present invention defines the axial distance between the edge of the water-spraying ring and the edge of the air guide ring as L, which satisfies: L≥5mm.

[0021] To achieve the above objectives, this utility model also proposes an air conditioner, including the axial flow fan described above.

[0022] The technical solution of this utility model is to design guide vanes on the inner or outer wall of the water-spraying ring. The guide vanes themselves have the ability to do work, so the design of the guide vanes can increase the working area of ​​the entire fan structure, which can generate a larger air volume at the same speed, improve the air volume of the axial fan, improve the heat exchange capacity, and thus improve the working efficiency.

[0023] Furthermore, when the blade structure is applied to an axial flow fan, the guide vane is located downstream of the fan's guide ring. Under the suction effect of the airflow driven by the guide vane, the backflow formed by the pressure difference between the upstream blade and the guide ring is suppressed, thereby further increasing the overall air volume.

[0024] Furthermore, the guide vane design can replace the original water-pumping structure of the water-pumping ring. When the guide vane moves to the lowest point, it can scoop up the accumulated condensate and throw it downstream onto the heat exchanger, increasing the heat exchange efficiency of the heat exchanger. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1A front view of an embodiment of the wind turbine blade structure provided by this utility model;

[0027] Figure 2 A side view of an embodiment of the wind turbine blade structure provided by this utility model;

[0028] Figure 3 A schematic diagram of another embodiment of the wind turbine structure provided by this utility model;

[0029] Figure 4 A front view of another embodiment of the wind turbine blade structure provided by this utility model;

[0030] Figure 5 A schematic diagram of another embodiment of the wind turbine structure provided by this utility model;

[0031] Figure 6 A front view of yet another embodiment of the wind turbine blade structure provided by this utility model;

[0032] Figure 7 A schematic diagram of another embodiment of the fan blade structure provided by this utility model;

[0033] Figure 8 A side view of another embodiment of the wind turbine structure provided by this utility model;

[0034] Figure 9 This is a front view of an embodiment of the axial flow fan provided by this utility model;

[0035] Figure 10 for Figure 9 Sectional view at point AA;

[0036] Figure 11 A schematic diagram of the structure of an embodiment of the air conditioner provided by this utility model;

[0037] Figure 12 An exploded view of a partial structure of an embodiment of the air conditioner provided by this utility model.

[0038] Explanation of icon numbers:

[0039] label name label name 1000 air conditioner 20 Motor bracket 100 Axial flow fan 30 rear panel 10 Wind turbine blade structure 40 air guide ring 11 wheel hub 200 base plate 12 Wind Leaf 300 Front panel 13 Water ring 400 outer cover 14 Guide vanes 410 air inlet 14a curved plate 500 compressor 14b flat 600 heat exchanger 15 Reinforcing ring 700 motor

[0040] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0042] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0043] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0044] Window air conditioners have a large market share due to their ease of installation and small footprint. Window air conditioners have a compact structure, integrating the indoor and outdoor units. The outdoor unit typically uses an axial flow fan, while the indoor unit often uses a cross-flow or centrifugal fan. Because of size limitations, the axial flow fan blades on the outdoor unit are often small, resulting in lower airflow, insufficient heat exchange capacity, and low efficiency. This fan blade structure is applied to axial flow fans, which can be used in window air conditioners, floor-standing air conditioners, wall-mounted air conditioners, and other air conditioning equipment. Axial flow fans can also include a motor bracket, rear panel, and air guide ring, all integrated into a single unit, with the fan blades installed inside the air guide ring.

[0045] Based on the above problems, this utility model proposes a fan blade structure 10, which aims to increase the air volume of the axial flow fan 100, thereby improving the heat exchange capacity and thus improving the working efficiency.

[0046] Please see Figures 1 to 8In one embodiment of the present invention, the fan blade structure 10 includes a hub 11, a fan blade 12, and a water jet ring 13; the fan blade 12 is disposed on the outer edge of the hub 11; the water jet ring 13 is disposed on the periphery of the fan blade 12 and connected to the fan blade 12; the inner side wall and / or the outer side wall of the water jet ring 13 are provided with guide vanes 14.

[0047] Understandably, when the fan blade structure 10 is applied to the axial flow fan 100, the fan blade structure 10 is installed inside the air guide ring 40. The airflow first passes through the air guide ring 40, and under the guidance of the air guide ring 40, the airflow is smoothly directed to the fan blade structure 10. Since the inner or outer wall of the water-spraying ring 13 of the fan blade structure 10 is designed with guide vanes 14, the working area of ​​the entire fan blade structure 10 can be increased, thereby generating a larger air volume at the same speed.

[0048] In this embodiment, as the condensate on the heat exchanger of the indoor unit of the window air conditioner accumulates in the water collection tray area of ​​the outdoor unit through the chassis, when the axial fan 100 is working, the fan blade structure 10 rotates so as to push the accumulated condensate onto the heat exchanger 600 of the outdoor unit through the guide vanes 14 on the water spray ring 13, thereby enhancing the heat dissipation of the heat exchanger 600 and improving the heat exchange efficiency.

[0049] In practical applications, the number of guide vanes 14 can be designed to be one or more, as long as it can increase the working area of ​​the entire fan blade structure 10 and at the same time push the accumulated condensate onto the heat exchanger 600 of the outdoor unit.

[0050] In practical applications, the fan blade 12, the water jet ring 13, and the guide vane 14 can be integrally formed to ensure reliable connections between the various structures. Of course, in other embodiments, the water jet ring 13 can also be connected to the fan blade 12 by bonding, screwing, or snapping, and similarly, the guide vane 14 can be connected to the water jet ring 13 by bonding, screwing, or snapping.

[0051] In practical applications, the guide vane 14 can be in the form of an arc-shaped plate 14a, a flat plate 14b, or a bent plate, a corrugated plate, etc.

[0052] In one embodiment, please refer to Figure 1 , Figure 2 Several guide vanes 14 can be provided on the outer wall of the water-spraying ring 13.

[0053] In another embodiment, please refer to Figure 3 , Figure 4 Several guide vanes 14 can be provided on the inner side wall of the water-spraying ring 13.

[0054] In summary, the technical solution of this utility model designs guide vanes 14 on the inner or outer side wall of the water-spraying ring 13. The guide vanes 14 themselves have the ability to perform work. Therefore, the design of the guide vanes 14 can increase the working area of ​​the entire fan structure 10, and can generate a larger air volume at the same speed, thereby increasing the air volume of the axial fan 100, improving the heat exchange capacity, and thus improving the working efficiency.

[0055] Furthermore, when the fan blade structure 10 is applied to the axial flow fan 100, the guide vane 14 is located downstream of the guide ring 40 of the axial flow fan 100. Under the suction effect of the airflow driven by the guide vane 14, the backflow formed by the gap between the upstream fan blade 12 and the guide ring 40 due to the pressure difference between the front and rear is suppressed, thereby further increasing the overall air volume.

[0056] Furthermore, the design of the guide vane 14 can replace the original water-pumping structure of the water-pumping ring 13. When the guide vane 14 moves to the lowest point, it can scoop up the accumulated condensate and throw it downstream onto the heat exchanger 600, thereby increasing the heat exchange efficiency of the heat exchanger 600.

[0057] Please see Figure 5 , Figure 6 In one embodiment of this utility model, a reinforcing ring 15 is provided around the water-spraying ring 13, and a guide vane 14 is disposed between the water-spraying ring 13 and the reinforcing ring 15.

[0058] With this configuration, since the guide vane 14 is thin and small in size, it is prone to deformation. Therefore, by setting a reinforcing ring 15 around the water-spraying ring 13, the guide vane 14 is sandwiched between the water-spraying ring 13 and the reinforcing ring 15. The reinforcing ring 15 can reinforce the guide vane 14 and improve its resistance to deformation.

[0059] It should be noted that the reinforcing ring 15 also serves the same function as the water spraying ring 13, which is equivalent to having a double water spraying ring 13 around the fan blade 12.

[0060] In one embodiment of this utility model, the guide vane 14 can be designed as an arc-shaped plate 14a, or the guide vane 14 can be designed as a flat plate 14b. With this configuration, by designing the guide vane 14 as an arc-shaped plate 14a or a flat plate 14b, the working area of ​​the entire fan blade structure 10 can be effectively increased without affecting the water spraying effect, and a larger air volume can be generated at the same rotation speed.

[0061] In one embodiment, please refer to Figure 1 , Figure 2 The guide vane 14 is designed as an arc-shaped plate 14a, that is, the air guiding surface of the guide vane 14 is an arc-shaped surface.

[0062] In another embodiment, please refer to Figure 7 , Figure 8The guide vane 14 is designed as a flat plate 14b, that is, the air guiding surface of the guide vane 14 is flat.

[0063] Please see Figure 2 In one embodiment of this utility model, the angle between the tangent of the end of the guide vane 14 near the air inlet side of the fan blade 12 and the rotation direction of the guide vane 14 is defined as θ1, which satisfies: θ1>90°.

[0064] With this configuration, when the angle θ1 between the tangent at the end of the guide vane 14 near the air inlet side of the fan blade 12 and the rotation direction of the guide vane 14 is too small, it cannot be guaranteed that the airflow blown by the guide vane 14 is in the same direction as the airflow blown by the fan blade 12, resulting in a weaker work capacity of the guide vane 14 itself. Therefore, by controlling the angle θ1 between the tangent at the end of the guide vane 14 near the air inlet side of the fan blade 12 and the rotation direction of the guide vane 14 to be greater than 90°, when the fan blade structure 10 is working, the airflow blown by the guide vane 14 can be kept in the same direction as the airflow blown by the fan blade 12, so as to ensure that the guide vane 14 itself has a stronger work capacity, and the working area of ​​the entire fan blade structure 10 can be further increased, thereby generating a larger air volume at the same rotation speed.

[0065] As some examples, the angle θ1 between the tangent of the end of the guide vane 14 near the air inlet side of the fan blade 12 and the rotation direction of the guide vane 14 can be 91°, 95°, 100°, 105°, 107°, 110°, 120°, 135°, 150°, etc.

[0066] Please see Figure 2 In one embodiment of this utility model, the angle between the tangent of the end of the guide vane 14 away from the air inlet side of the fan blade 12 and the rotation direction of the guide vane 14 is defined as θ2, which satisfies: θ2≥90°.

[0067] With this configuration, if the angle θ2 between the tangent at the end of the guide vane 14 furthest from the air inlet side of the fan blade 12 and the rotation direction of the guide vane 14 is too small, it cannot be guaranteed that the airflow blown by the guide vane 14 is in the same direction as the airflow blown by the fan blade 12, resulting in a weaker work capacity of the guide vane 14 itself. Therefore, by controlling the angle θ2 between the tangent at the end of the guide vane 14 furthest from the air inlet side of the fan blade 12 and the rotation direction of the guide vane 14 to be greater than or equal to 90°, when the fan blade structure 10 is working, the airflow blown by the guide vane 14 can be kept in the same direction as the airflow blown by the fan blade 12, thus ensuring that the guide vane 14 itself has a stronger work capacity, further increasing the working area of ​​the entire fan blade structure 10, thereby generating a larger air volume at the same rotation speed.

[0068] As some examples, the angle θ2 between the tangent at the end of the guide vane 14 away from the air inlet side of the fan blade 12 and the rotation direction of the guide vane 14 can be 90°, 92°, 95°, 97°, 100°, 102°, 104°, 110°, 113°, 117°, 120°, etc.

[0069] Please see Figure 1 In one embodiment of the present invention, the inner and / or outer walls of the water jet ring 13 are provided with a plurality of guide vanes 14 spaced apart in the circumferential direction.

[0070] This configuration, through the design of multiple guide vanes 14, can further enhance the total working capacity of all guide vanes 14, thereby further increasing the working area of ​​the entire fan blade structure 10, and thus generating a larger air volume at the same rotational speed.

[0071] In practical applications, the number of guide vanes 14 can be designed to be 10, 11, 12, 13, 14, 15, etc., as long as it can increase the working area of ​​the entire fan blade structure 10 and at the same time pump the accumulated condensate onto the heat exchanger 600 of the outdoor unit.

[0072] Please see Figure 1 In one embodiment of this utility model, the number of guide vanes 14 is n≥12.

[0073] With this configuration, when the number of guide vanes 14 is too small, the increase in the working area of ​​the entire fan blade structure 10 is not significant. Therefore, by controlling the number of guide vanes 14 to be no less than 12, the guide vanes 14 can have a sufficiently large working capacity, so that the working area of ​​the entire fan blade structure 10 can be fully increased to meet the demand for larger air volume.

[0074] In practical applications, the spacing between two adjacent guide vanes 14 can be the same or different. Of course, to ensure the uniformity of airflow, the spacing between two adjacent guide vanes 14 can be kept consistent.

[0075] Please see Figure 2 In one embodiment of this utility model, the water-spraying ring 13 is axially connected to the tail edge of the fan blade 12.

[0076] With this configuration, by connecting the water-spraying ring 13 axially to the trailing edge of the fan blade 12, the air volume at the same rotation speed can be greatly increased without affecting the water-spraying effect of the water-spraying ring 13.

[0077] Please see Figure 9 , Figure 10This utility model also proposes an axial flow fan 100, which includes a motor bracket 20, a rear panel 30, a bracket guide ring 40, and a fan blade structure 10. The specific structure of the fan blade structure 10 is as described in the above embodiments. Since this axial flow fan 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The rear panel 30 is disposed on the motor bracket 20; the guide ring 40 is disposed on the rear panel 30; and the fan blade structure 10 is disposed on the inner side of the guide ring 40.

[0078] Understandably, the negative pressure generated by the rotation of the fan blade structure 10 causes the airflow to first pass through the guide ring 40. Under the guidance of the guide ring 40, the airflow is smoothly directed to the guide vanes 14 and 12 of the fan blade structure 10. By having the guide vanes 14 and 12 work simultaneously, a larger air volume can be generated at the same rotation speed, which increases the air volume of the axial fan 100, improves the heat exchange capacity, and thus improves the working efficiency.

[0079] In practical applications, the motor bracket 20, the rear panel 30, and the air guide ring 40 can be integrally formed to ensure reliable connections between the various structures. Of course, in other embodiments, the rear panel 30 can also be connected to the motor bracket 20 by adhesive bonding, screw connection, snap-fitting, or similar methods. Similarly, the air guide ring 40 can also be connected to the rear panel 30 by adhesive bonding, screw connection, snap-fitting, or similar methods.

[0080] Please see Figure 10 In one embodiment of this utility model, the height of the guide vane 14 in the radial direction of the water-spraying ring 13 is defined as H, the inner wall diameter of the wind guide ring 40 is defined as D1, and the outer diameter of the wind blade 12 is defined as D2, then H≥0.5(D1-D2).

[0081] With this configuration, if the height of the guide vane 14 in the radial direction of the water-spraying ring 13 is too small, a large gap will exist between the guide vane 14 and the air guide ring 40 in the radial direction, causing some airflow to backflow through this gap. Therefore, by controlling the relationship between the height of the guide vane 14 in the radial direction of the water-spraying ring 13 and the inner wall surface of the air guide ring 40 and the outer diameter of the fan blade 12 to H≥0.5(D1-D2), and with the guide vane 14 located downstream of the air guide ring 40, the backflow caused by the pressure difference between the upstream fan blade 12 and the air guide ring 40 can be better suppressed under the suction effect of the airflow driven by the guide vane 14, thereby further increasing the overall air volume.

[0082] As examples, the relationship between the height of the guide vane 14 in the radial direction of the water-spraying ring 13 and the inner wall surface of the wind guide ring 40 and the outer diameter of the fan blade 12 can be H = 0.5(D1-D2), 0.55(D1-D2), 0.6(D1-D2), 0.65(D1-D2), 0.7(D1-D2), 0.75(D1-D2), 0.8(D1-D2), etc.

[0083] Please see Figure 10 In one embodiment of this utility model, the axial distance between the edge of the water spray ring 13 and the edge of the air guide ring 40 is defined as L, which satisfies: L≥5mm.

[0084] With this configuration, since the fan blade structure 10 rotates relative to the air guide ring 40 during operation, by controlling the axial distance between the edge of the water spray ring 13 and the edge of the air guide ring 40 to be greater than or equal to 5mm, it is possible to ensure that there is a sufficient safe distance between the water spray ring 13 and the air guide ring 40, which can effectively prevent collisions between the fan blade structure 10 and the air guide ring 40 and noise caused by dynamic and static interference.

[0085] As examples, the axial distance L between the edge of the water-spraying ring 13 and the edge of the air guide ring 40 can be 5mm, 5.1mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm, 5.6mm, 5.7mm, 5.8mm, 5.9mm, 6mm, etc.

[0086] Please see Figure 11 , Figure 12 This utility model also proposes an air conditioner 1000, which includes an axial flow fan 100. The specific structure of the axial flow fan 100 is as described in the above embodiments. Since this air conditioner 1000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0087] In practical applications, the air conditioner 1000 can be a window unit, a floor-standing air conditioner 1000, or a wall-mounted air conditioner 1000.

[0088] In one embodiment, the air conditioner 1000 may further include a base plate 200, a front panel 300, an outer cover 400, a heat exchanger 600, a compressor 500, and a motor 700. The front panel 300 is located on the front side of the base plate 200; the outer cover 400 covers the base plate 200 and is located on the rear side of the front panel 300, and the outer cover 400 has an air inlet 410. The outer cover 400, the base plate 200, and the front panel 300 enclose a cavity; an axial flow fan 100 is installed in the cavity; the heat exchanger 600 is installed in the cavity and is located on the side of the axial flow fan 100 away from the front panel 300; the compressor 500 is installed in the cavity and is located between the axial flow fan 100 and the front panel 300; the motor 700 is installed in the cavity and is connected to the fan blade structure 10 of the axial flow fan 100 for driving the fan blade structure 10 to rotate.

[0089] When the motor 700 drives the fan blade structure 10 to rotate, it can generate negative pressure inside the axial flow fan 100. Under the action of negative pressure, outside air enters from the air inlet 410 of the outer cover 400. The airflow flows to the guide vane 14 and fan blade 12 of the fan blade structure 10 under the guidance of the guide ring 40. By having the guide vane 14 and fan blade 12 do work at the same speed, a larger air volume can be generated at the same speed, which increases the air volume of the axial flow fan 100, improves the heat exchange capacity, and thus improves the working efficiency.

[0090] In one embodiment, the top, left and right sides of the outer cover 400 may be provided with air inlets 410 so that outside air can enter from the top, left and right sides at the same time.

[0091] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A wind turbine blade structure, characterized in that, include: Wheel hub; The fan blades are located on the outer edge of the hub; A water-spraying ring is located around the fan blade and connected to the fan blade; the inner and / or outer walls of the water-spraying ring are provided with guide vanes.

2. The wind turbine blade structure as described in claim 1, characterized in that, The water-spraying ring is surrounded by a reinforcing ring, and the guide vane is located between the water-spraying ring and the reinforcing ring.

3. The wind turbine blade structure as described in claim 1, characterized in that, The guide vane is either an arc-shaped plate or a flat plate.

4. The wind turbine blade structure as described in any one of claims 1 to 3, characterized in that, Define θ1 as the angle between the tangent at the end of the guide vane near the air inlet side of the fan blade and the rotation direction of the guide vane. Then, θ1 > 90°.

5. The wind turbine structure as described in any one of claims 1 to 3, characterized in that, Define θ2 as the angle between the tangent at the end of the guide vane away from the air inlet side of the fan blade and the rotation direction of the guide vane. Then, θ2 ≥ 90°.

6. The wind turbine blade structure as described in any one of claims 1 to 3, characterized in that, The inner and / or outer walls of the water jet ring are provided with multiple guide vanes spaced circumferentially.

7. The wind turbine blade structure as described in any one of claims 1 to 3, characterized in that, The water-spraying ring is axially connected to the trailing edge of the fan blade.

8. An axial flow fan, characterized in that, include: Motor bracket; The rear panel is located on the motor bracket; An air guide ring is located on the rear panel; The fan blade structure as described in any one of claims 1 to 7, wherein the fan blade structure is disposed on the inner side of the air guide ring.

9. The axial flow fan as described in claim 8, characterized in that, Let H be the height of the guide vane in the radial direction of the water-spraying ring, D1 be the inner wall diameter of the guide ring, and D2 be the outer diameter of the fan blade. Then, the following condition must be met: H ≥ 0.5(D1 - D2).

10. The axial flow fan as described in claim 8, characterized in that, If the axial distance between the edge of the water-spraying ring and the edge of the air guide ring is defined as L, then L≥5mm is satisfied.

11. An air conditioner, characterized in that, Including the axial flow fan as described in any one of claims 8 to 10.

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