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, the fan blade structure comprises a hub, fan blades, a water beating ring and an air guide 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. The air guide ring is arranged on the periphery of the fan blade and axially connected to the water beating ring, and the air guide ring is close to the air inlet side of the fan blade. 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 ring is placed around the fan blade and connected to the fan blade;

[0008] An air guide ring is disposed on the periphery of the fan blade and axially connected to the water spray ring, the air guide ring being close to the air inlet side of the fan blade.

[0009] In one embodiment of this application, the inner wall of the air guide ring is connected to the outer edge of the fan blade.

[0010] In one embodiment of this application, the air guide ring includes a first air guide ring, which is axially connected to the water spray ring, and the inner sidewall of the first air guide ring is connected to the outer edge of the fan blade.

[0011] Let the radius of the fan blade be R1 and the radius of the inner wall of the first air guide ring be R3, then the following condition is satisfied: 0≤R3-R1≤1mm.

[0012] In one embodiment of this application, the inner wall surface of the first air guide ring is cylindrical.

[0013] In one embodiment of this application, a second air guide ring extends from one side of the first air guide ring toward the air inlet side of the fan blade. The inner wall surface of the second air guide ring is conical, and the radius of the conical surface gradually increases along the direction from the first air guide ring toward the air inlet side of the fan blade.

[0014] In one embodiment of this application, the radius of the conical surface varies linearly or curvilinearly.

[0015] In one embodiment of this application, the axial length of the first air guide ring is defined as L1 and the axial length of the second air guide ring is defined as L2, which satisfies: 0.5(L1+L2)≤L2≤0.8(L1+L2).

[0016] In one embodiment of this application, the air guide ring and the water spray ring are connected by a connecting section, the inner surface of which is a ring surface or a partially hollowed-out discontinuous surface.

[0017] To achieve the above objectives, this utility model also proposes an axial flow fan, comprising:

[0018] Motor bracket;

[0019] The rear panel is located on the motor bracket;

[0020] A bracket air guide ring is located on the rear panel;

[0021] As described above, the fan blade structure is located inside the air guide ring of the support.

[0022] In one embodiment of this application, the wind guide ring of the fan blade structure includes a second wind guide ring. The radius of the inner wall surface of the end of the second wind guide ring away from the water spray ring is defined as R4, and the radius of the inner wall surface of the support wind guide ring is R2. Then, the following condition is satisfied: R4≥R2.

[0023] In one embodiment of this application, the wind guide ring of the fan blade structure includes a second wind guide ring. The axial distance between the end of the second wind guide ring near the support wind guide ring and the end face of the support wind guide ring near the second wind guide ring is defined as d1, which satisfies: d1≥5mm.

[0024] To achieve the above objectives, this utility model also proposes an air conditioner, including the axial flow fan described above.

[0025] The technical solution of this utility model is to design an air guide ring around the fan blade, so that the fan blade, water spray ring and air guide ring form a whole. When the airflow passes through the air inlet side of the fan blade, the air guide ring can guide the airflow at the trailing edge of the fan blade, so that the airflow is introduced into the fan blade more smoothly and accelerated by the work done by the fan blade, thereby increasing the air volume of the axial flow fan, improving the heat exchange capacity, and thus improving the working efficiency.

[0026] In addition, the obstruction of the air guide ring can improve the backflow of high-pressure airflow from downstream to low-pressure area upstream, thereby increasing the overall air volume and improving the working efficiency. Attached Figure Description

[0027] 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.

[0028] Figure 1 A schematic diagram of an embodiment of the wind turbine blade structure provided by this utility model;

[0029] Figure 2 A front view of an embodiment of the wind turbine blade structure provided by this utility model;

[0030] Figure 3 for Figure 2 Sectional view at point AA;

[0031] Figure 4 A schematic diagram of another perspective of an embodiment of the wind turbine structure provided by this utility model;

[0032] Figure 5 A schematic diagram of another embodiment of the wind turbine structure provided by this utility model from another perspective;

[0033] Figure 6 This is a front view of an embodiment of the axial flow fan provided by this utility model;

[0034] Figure 7 for Figure 6 Sectional view at point BB;

[0035] Figure 8 for Figure 7 A magnified view of a portion of point A' in the middle;

[0036] Figure 9 A schematic diagram of the structure of an embodiment of the air conditioner provided by this utility model;

[0037] Figure 10 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 143a torus 100 Axial flow fan 143b Hollowed-out positions 10 Wind turbine blade structure 20 Motor bracket 11 wheel hub 30 rear panel 12 Wind Leaf 40 Support air guide ring 13 Water ring 200 base plate 131 Water-spraying structure 300 Front panel 14 air guide ring 400 outer cover 141 First air guide ring 410 air inlet 141a cylindrical surface 500 compressor 142 Second air guide ring 600 heat exchanger 142a Conical surface 700 motor 143 Connecting segment

[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 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.

[0045] Based on the above problems, this utility model proposes a fan blade structure 10, aiming to increase the air volume of the axial flow fan 100, thereby improving its heat exchange capacity and thus its working efficiency. This fan blade structure 10 is applied to the axial flow fan 100, which can be used in air conditioning equipment such as window units, floor-standing air conditioners 1000, and wall-mounted air conditioners 1000. The axial flow fan 100 may also include a motor bracket 20, a rear panel 30, and a bracket air guide ring 40, and the motor bracket 20, rear panel 30, and bracket air guide ring 40 are integrated into a single unit. The fan blade structure 10 can be installed inside the bracket air guide ring 40.

[0046] Please see Figures 1 to 8 In one embodiment of the present invention, the fan blade structure 10 includes a hub 11, a fan blade 12, a water spray ring 13, and a guide ring 14; the fan blade 12 is disposed on the outer edge of the hub 11; the water spray ring 13 is disposed on the periphery of the fan blade 12 and connected to the fan blade 12; the guide ring 14 is disposed on the periphery of the fan blade 12 and axially connected to the water spray ring 13, and the guide ring 14 is close to the air inlet side of the fan blade 12.

[0047] Understandably, when the blade structure 10 is applied to the axial flow fan 100, the blade structure 10 is installed inside the bracket guide ring 40. The airflow first passes through the bracket guide ring 40, and under the guidance of the bracket guide ring 40, the airflow is smoothly directed to the blade structure 10. Then, the airflow at the trailing edge of the blade 12 is guided by the guide ring 14 on the blade structure 10, so that the airflow is more smoothly introduced into the blade 12 and accelerated by the work done by the blade 12, thereby increasing the air volume of the axial flow fan 100.

[0048] In this embodiment, as the condensate on the heat exchanger of the indoor unit of the window air conditioner flows outward through the chassis and accumulates in the water collection tray area of ​​the outdoor unit, when the axial fan 100 is working, the fan blade structure 10 rotates to spray the accumulated condensate onto the heat exchanger 600 of the outdoor unit through the water spraying structure 131 on the water spraying 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 water pumping structures 131 can be 1, 2, 3, 4, etc., as long as they can pump the accumulated condensate onto the heat exchanger 600 of the outdoor unit. No specific limit is made here.

[0050] In practical applications, the fan blade 12, the water jet ring 13, and the air guide ring 14 can be integrally formed to ensure the reliability of the connection between the various structures. Of course, in other embodiments, the water jet ring 13 can also be connected to the fan blade 12 by means of bonding, screw connection, snap-fit, etc. Similarly, the air guide ring 14 can also be connected to the water jet ring 13 by means of bonding, screw connection, snap-fit, etc.

[0051] In practical applications, the air guide ring 14 can be connected only to the water pumping ring 13, or it can be connected to both the water pumping ring 13 and the fan blade 12.

[0052] In summary, the technical solution of this utility model, by designing an air guide ring 14 around the fan blade 12, integrates the fan blade 12, the water-spraying ring 13, and the air guide ring 14 into a single unit. When the airflow passes through the air inlet side of the fan blade 12, the air guide ring 14 guides the airflow at the trailing edge of the fan blade 12, allowing the airflow to be introduced into the fan blade 12 more smoothly. The airflow is then accelerated by the work done by the fan blade 12, increasing the air volume of the axial flow fan 100, improving heat exchange capacity, and thus enhancing working efficiency. Therefore, by designing the fan blade 12, the water-spraying ring 13, and the air guide ring 14 as a single unit, this solution can effectively improve the air volume and working efficiency of the axial flow fan 100 without affecting water spraying.

[0053] In addition, the obstruction of the air guide ring 14 can also improve the backflow of the high-pressure airflow downstream to the low-pressure area upstream, thereby increasing the overall air volume and improving the working efficiency.

[0054] It should be noted that since window air conditioners generally use 2-3 layers of heat exchangers 600, the system resistance is relatively high. To ensure a safe distance and structural reliability, a blade tip gap of more than 5mm is generally left between the fan blade 12 and the bracket guide ring 40. Due to the presence of the blade tip gap and the large pressure difference between the air inlet and outlet sides of the axial fan 100, there is a strong backflow between the fan blade 12 and the bracket guide ring 40, which affects the air volume and working efficiency.

[0055] Based on this, please refer to Figure 1 , Figure 2 In one embodiment of this utility model, the inner wall of the air guide ring 14 can be connected to the outer edge of the fan blade 12.

[0056] With this configuration, the design of the air guide ring 14 can also eliminate the blade tip gap, suppress the backflow caused by the blade tip gap and the leakage flow between the pressure surface and the suction surface, thereby improving the working efficiency of the axial flow fan 100.

[0057] Please see Figure 2 , Figure 3 In one embodiment of this utility model, the air guide ring 14 includes a first air guide ring 141, which is axially connected to the water spray ring 13. The inner sidewall of the first air guide ring 141 is connected to the outer edge of the fan blade 12. The radius of the fan blade 12 is defined as R1, and the radius of the inner wall surface of the first air guide ring 141 is defined as R3. Then the condition is satisfied: 0≤R3-R1≤1mm.

[0058] With this configuration, when the difference between the inner wall radius of the first guide ring 141 and the radius of the fan blade 12 is too large, the blade tip gap cannot be effectively eliminated, resulting in a strong backflow between the fan blade 12 and the support guide ring 40, which affects the air volume and working efficiency. Therefore, by controlling the difference between the inner wall radius of the first guide ring 141 and the radius of the fan blade 12 to between 0 and 1 mm, the blade tip gap can be effectively eliminated.

[0059] As examples, the difference R3-R1 between the inner wall radius of the first guide ring 141 and the radius of the fan blade 12 can be 0, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc.

[0060] It should be noted that the radius of the wind turbine blade 12 refers to the outer edge radius of the wind turbine blade 12.

[0061] In practical applications, the inner wall surface of the first air guide ring 141 can be a cylindrical surface 141a, a prismatic surface, or a conical surface.

[0062] Please see Figure 8 In one embodiment of this utility model, the inner wall surface of the first air guide ring 141 can be a cylindrical surface 141a.

[0063] By designing the inner wall of the first air guide ring 141 as a cylindrical surface 141a, the connection area between the inner wall of the first air guide ring 141 and the outer edge of the fan blade 12 can be increased, thus making it easier to connect the inner wall of the first air guide ring 141 and the outer edge of the fan blade 12.

[0064] Please see Figure 3 , Figure 8 In one embodiment of the present invention, a second air guide ring 142 extends from one side of the first air guide ring 141 toward the air inlet side of the fan blade 12. The inner wall surface of the second air guide ring 142 is a conical surface 142a, and the radius of the conical surface 142a gradually increases along the direction from the first air guide ring 141 toward the air inlet side of the fan blade 12.

[0065] With this configuration, when the airflow passes through the air inlet side of the fan blade 12, it can be guided more smoothly to the inside of the first air guide ring 141 by the second air guide ring 142, whose inner wall surface is conical 142a. Then, the airflow is introduced into the fan blade 12 through the first air guide ring 141. Therefore, by designing the inner wall surface of the second air guide ring 142 to be conical 142a, the air collection effect can be improved, thereby further increasing the air volume of the axial flow fan 100.

[0066] In one embodiment, the first air guide ring 141 and the second air guide ring 142 can be integrally formed, which not only ensures the reliability of the connection between the first air guide ring 141 and the second air guide ring 142, but also simplifies the manufacturing process. Of course, in other embodiments, the first air guide ring 141 and the second air guide ring 142 can also be connected by means of bonding, screw connection, plug-in connection, etc.

[0067] In one embodiment, the cylindrical surface 141a of the first air guide ring 141 and the conical surface 142a of the second air guide ring 142 can be designed with a rounded transition. This allows the airflow to flow more smoothly to the cylindrical surface 141a under the guidance of the conical surface 142a, thereby reducing the loss of airflow.

[0068] Please see Figure 8 In one embodiment of this utility model, the radius of the conical surface 142a can vary linearly; or, the radius of the conical surface 142a can vary curvilinearly. Both configurations allow the radius of the conical surface 142a to gradually increase along the direction from the first guide ring 141 towards the air inlet side of the fan blade 12. When the radius of the conical surface 142a varies linearly, its cross-section is designed as an inclined plane; when the radius of the conical surface 142a varies curvilinearly, its cross-section is designed as an arc surface.

[0069] Please see Figure 8 In one embodiment of this utility model, the axial length of the first air guide ring 141 is defined as L1 and the axial length of the second air guide ring 142 is defined as L2, which satisfies: 0.5(L1+L2)≤L2≤0.8(L1+L2).

[0070] With this configuration, by controlling the axial length L2 of the second air guide ring 142 between 0.5(L1+L2) and 0.8(L1+L2), the first air guide ring 141 and the second air guide ring 142 can be guaranteed to have a good flow collection effect, which can further improve the air volume of the axial flow fan 100.

[0071] As examples, the relationship between the axial length of the first air guide ring 141 and the axial length of the second air guide ring 142 can be L2 = 0.5(L1+L2), 0.55(L1+L2), 0.6(L1+L2), 0.65(L1+L2), 0.7(L1+L2), 0.75(L1+L2), 0.8(L1+L2), etc.

[0072] Please see Figures 3 to 5 , Figure 8 In one embodiment of this utility model, the air guide ring 14 and the water spraying ring 13 are connected by a connecting section 143. The inner surface of the connecting section 143 is a circular annular surface 143a or a partially hollowed-out discontinuous surface.

[0073] With this configuration, the connection between the air guide ring 14 and the water spray ring 13 is achieved by using the connecting section 143, which makes the connection between the air guide ring 14 and the water spray ring 13 more reliable. At the same time, using the connecting section 143 makes it easier to design the position of the air guide ring 14, so that the air guide ring 14 can be closer to the trailing edge of the blade 12, thereby effectively eliminating the blade tip gap.

[0074] In one embodiment, please refer to Figure 4 The inner surface of the connecting section 143 can be designed as a ring surface 143a, that is, the connecting section 143 is designed as a ring. This design can ensure the reliability of the connection between the connecting section 143 and the air guide ring 14 and the water spraying ring 13.

[0075] In another embodiment, please refer to Figure 5 The inner side of the connecting section 143 can also be designed as a hollowed-out intermittent surface. That is, the connecting section 143 is designed as a multi-segmented arc-shaped section distributed along the circumference of the air guide ring 14, and a hollowed-out position 143b is formed between two adjacent arc-shaped sections. This design can reduce weight.

[0076] Please see Figures 6 to 8 This 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 bracket guide ring 40 is disposed on the rear panel 30; and the fan blade structure 10 is disposed on the inner side of the bracket guide ring 40.

[0077] Understandably, the rotation of the fan blade structure 10 generates negative pressure. The airflow first passes through the support guide ring 40. Under the guidance of the support guide ring 40, the airflow is smoothly directed to the fan blade structure 10. Then, the airflow at the trailing edge of the fan blade 12 is guided by the guide ring 14 on the fan blade structure 10, so that the airflow is more smoothly introduced into the fan blade 12 and accelerated by the work done by the fan blade 12, thereby increasing the air volume of the axial flow fan 100.

[0078] In practical applications, the motor bracket 20, the rear panel 30, and the bracket air guide ring 40 can be integrally formed, which ensures the reliability of the connection between the various structures. Of course, in other embodiments, the rear panel 30 can also be connected to the motor bracket 20 by means of bonding, screw connection, snap-fit, etc. Similarly, the bracket air guide ring 40 can also be connected to the rear panel 30 by means of bonding, screw connection, snap-fit, etc.

[0079] Please see Figure 6 , Figure 7 In one embodiment of this utility model, the wind guide ring 14 of the fan blade structure 10 includes a second wind guide ring 142. The radius of the inner wall surface of the end of the second wind guide ring 142 away from the water spray ring 13 is defined as R4, and the radius of the inner wall surface of the bracket wind guide ring 40 is R2. Then, the following condition is satisfied: R4≥R2.

[0080] With this configuration, when the inner wall radius R4 of the end of the second air guide ring 142 furthest from the water-spraying ring 13 is smaller than the inner wall radius R2 of the support air guide ring 40, a gap will exist in the radial direction between the end of the second air guide ring 142 furthest from the water-spraying ring 13 and the support air guide ring 40. When airflow flows from the support air guide ring 40 to the second air guide ring 142, some airflow will leak through this gap in the radial direction, affecting airflow and working efficiency. Therefore, by making the inner wall radius R4 of the end of the second air guide ring 142 furthest from the water-spraying ring 13 greater than or equal to the inner wall radius R2 of the support air guide ring 40, the gap in the radial direction between the end of the second air guide ring 142 furthest from the water-spraying ring 13 and the support air guide ring 40 can be eliminated, thereby preventing airflow leakage through this gap and ensuring airflow and working efficiency.

[0081] It should be noted that the radius R4 of the inner wall surface of the second air guide ring 142 at the end furthest from the water spray ring 13 is the maximum inner wall surface radius of the second air guide ring 142.

[0082] The inner wall radius R2 of the support air guide ring 40 is the inner wall radius of the support air guide ring 40 closest to the second air guide ring 142.

[0083] Please see Figure 8 In one embodiment of this utility model, the wind guide ring 14 of the fan blade structure 10 includes a second wind guide ring 142. The axial distance between the end of the second wind guide ring 142 near the support wind guide ring 40 and the end face of the support wind guide ring 40 near the second wind guide ring 142 is defined as d1, which satisfies: d1≥5mm.

[0084] With this configuration, since the fan blade structure 10 rotates relative to the support guide ring 40 during operation, by controlling the axial distance between the end of the second guide ring 142 near the support guide ring 40 and the end face of the support guide ring 40 near the second guide ring 142 to be greater than or equal to 5mm, it is possible to ensure that there is a sufficient safe distance between the second guide ring 142 and the support guide ring 40, which can effectively prevent collisions between the fan blade structure 10 and the support guide ring 40 and noise caused by dynamic and static interference.

[0085] As examples, the axial distance d1 between the end of the second air guide ring 142 near the support air guide ring 40 and the end face of the support air guide ring 40 near the second air guide ring 142 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 9 , Figure 10 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, a wall-mounted air conditioner 1000, etc.

[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 air guide ring 14 of the fan blade structure 10 under the guidance of the bracket air guide ring 40. Then, under the combined flow of the first air guide ring 141 and the second air guide ring 142 of the air guide ring 14, more air volume is introduced into the fan blade 12. The airflow is accelerated by the work done by the fan blade 12, which increases the air volume of the axial flow fan 100. Then the airflow flows through the heat exchanger 600 for heat exchange, which 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 ring is placed around the fan blade and connected to the fan blade; An air guide ring is disposed on the periphery of the fan blade and axially connected to the water spray ring, the air guide ring being close to the air inlet side of the fan blade.

2. The wind turbine blade structure as described in claim 1, characterized in that, The inner wall of the air guide ring is connected to the outer edge of the fan blade.

3. The wind turbine blade structure as described in claim 2, characterized in that, The air guide ring includes a first air guide ring, which is axially connected to the water spray ring, and the inner sidewall of the first air guide ring is connected to the outer edge of the fan blade. Let the radius of the fan blade be R1 and the radius of the inner wall of the first air guide ring be R3, then the following condition is satisfied: 0≤R3-R1≤1mm.

4. The wind turbine blade structure as described in claim 3, characterized in that, The inner wall of the first air guide ring is cylindrical.

5. The wind turbine blade structure as described in claim 3, characterized in that, A second air guide ring extends from one side of the first air guide ring toward the air inlet side of the fan blade. The inner wall of the second air guide ring is conical, and the radius of the conical surface gradually increases along the direction from the first air guide ring toward the air inlet side of the fan blade.

6. The wind turbine blade structure as described in claim 5, characterized in that, The radius of the conical surface varies linearly or curvilinearly.

7. The wind turbine blade structure as described in claim 5, characterized in that, Let the axial length of the first air guide ring be L1 and the axial length of the second air guide ring be L2, then the following condition must be met: 0.5≤L2≤0.

8.

8. The wind turbine structure as described in any one of claims 1 to 7, characterized in that, The air guide ring and the water spray ring are connected by a connecting section, the inner surface of which is either a circular ring or a partially hollowed-out discontinuous surface.

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

10. The axial flow fan as described in claim 9, characterized in that, The wind guide ring of the fan blade structure includes a second wind guide ring. The radius of the inner wall of the end of the second wind guide ring away from the water spray ring is defined as R4, and the radius of the inner wall of the support wind guide ring is R2. Then, the following condition is satisfied: R4≥R2.

11. The axial flow fan as described in claim 9, characterized in that, The wind guide ring of the wind blade structure includes a second wind guide ring. The axial distance between the end of the second wind guide ring near the support wind guide ring and the end face of the support wind guide ring near the second wind guide ring is defined as d1, which satisfies: d1≥5mm.

12. An air conditioner, characterized in that, Including the axial flow fan as described in any one of claims 9 to 11.

Images