Fan blade with large air volume

Abstract

The utility model discloses a large-air-volume fan blade which comprises a hub and a plurality of blades arranged on the periphery of the hub in a surrounding mode, and a mounting hole is formed in the center of the hub in a penetrating mode. Each blade comprises a connecting part, a middle rotating part and an empennage which are sequentially connected, the connecting part is obliquely connected with the peripheral edge of the hub, the middle rotating part comprises a bent outer edge and an inner side edge, the bent outer edge enables the position of the empennage to be lower than the lower end of the hub, the middle rotating part is spirally arranged, and the inner side edge is arranged at the lower end of the hub. And the end part of the tail wing is reversely folded relative to the spiral direction of the middle rotating part, and a concave first air guide part is formed between the bent outer edge and the inner side edge. According to the utility model, the air volume output of the fan is improved, and the noise is reduced to a certain extent by adopting the arc blade tip structure, so that the overall air volume of the fan is improved, and the user requirements are met.

Description

Technical Field

[0001] This utility model relates to the field of fan blades, and in particular to a fan blade with a large air volume. Background Technology

[0002] A fan is a household appliance that uses an electric motor to drive fan blades to rotate, thereby accelerating the circulation of air. It is mainly used for cooling and ventilating. The fan blades are the key part of a fan that generates airflow. When the motor drives the fan blades to rotate, the blades push the surrounding air, causing it to flow and thus forming an airflow. This is the basis for a fan to achieve its functions of heat dissipation and ventilation.

[0003] In certain fields, a large air volume is often required, such as ceiling fans and exhaust fans. These types of fans usually only consider air volume and do not need to consider noise too much. There are generally two ways to improve air volume: one is to increase the driving force of the motor, which will increase the cost; the other is to improve the blade structure. Under the premise of reasonable cost control, improving the blade structure is obviously more in line with the needs of enterprises. Based on this, this application proposes a fan blade with a large air volume. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned defects in the prior art and provide a fan blade with a large air volume, which not only improves the air volume output of the fan, but also reduces noise to a certain extent by adopting a rounded blade tip structure, thereby improving the overall air volume of the fan and meeting user needs.

[0005] To achieve the above objectives, this utility model provides a high-volume fan blade, including a hub and multiple blades arranged around the hub, wherein a mounting hole is provided through the center of the hub;

[0006] Each blade includes a connecting part, a central spiral part, and a tail fin connected in sequence. The connecting part is obliquely connected to the periphery of the hub. The central spiral part includes a bent outer edge and an inner edge. The bent outer edge causes the tail fin to be positioned lower than the lower end of the hub. The central spiral part is spirally arranged so that the end of the tail fin is folded in the opposite direction to the spiral of the central spiral part. The central spiral part includes a bent outer edge and an inner edge. A concave first air guide part is formed between the bent outer edge and the inner edge.

[0007] Furthermore, a second air guide is formed in the middle of the tail fin, which is connected to the first air guide. Adding a second air guide to the tail fin can form an acceleration channel together with the concave curve of the first air guide, thereby increasing the wind speed.

[0008] Furthermore, a third air guide with a greater concave curvature than the first air guide is formed between the first air guide and the bent outer edge. The third air guide extends to the tail fin and communicates with the second air guide. This fan blade structure, by continuously integrating the first and second air guides from the inner edge to the outer edge, forms an axially-radial coupled composite flow channel system, thereby effectively improving the airflow output.

[0009] Furthermore, the tail fin has an arc-shaped blade tip, and the angle between the tangents of the horizontal projections of the two arc-shaped structures on either side of the blade tip is α1, with α1 ranging from 45° to 50°. This structure optimizes the aerodynamic performance of the fan blades through aerodynamic shape optimization and active flow field control. The arc-shaped blade tip design helps reduce air resistance, improves fan efficiency, and thus achieves higher airflow output. Simultaneously, the reasonable angle range effectively reduces noise generated during blade rotation, improving the fan's quietness.

[0010] Furthermore, let L1 be the line connecting the midpoint A of the connection between the connecting part and the hub in the horizontal projection and the center point C of the hub; let L2 be the line connecting the tangent point Q1 of the blade tip and the center point C of the hub; let α2 be the angle between L1 and L2, and let α2 be in the range of 35° to 40°. This design effectively reduces fan operating noise while increasing airflow output, meeting the market demand for high-airflow and low-noise fans.

[0011] Furthermore, the number of blades is seven. This provides sufficient airflow and air pressure while maintaining high aerodynamic efficiency.

[0012] Furthermore, a bushing is provided at the lower center of the hub, and the mounting hole passes through the bushing. A connecting groove for snap-fitting is provided on the bushing, which facilitates linkage with the fan motor.

[0013] Furthermore, a reinforcing member is connected to the outer side of the bushing, the reinforcing member being disposed along the outer surface of the bushing and extending to the inner wall of the hub, and reinforcing ribs are provided on the reinforcing member. The design of the reinforcing member significantly enhances the structural strength, rigidity, torsional resistance, and stability, improving overall performance and reliability.

[0014] Furthermore, the midpoint of the connection between the reinforcing member and the inner wall of the hub overlaps with the midpoint of the connection between the connecting part and the hub. This arrangement, where the reinforcing member and the connecting part are positioned on opposite sides of the hub wall and intersecting, improves the strength of the fan blade structure and extends its service life.

[0015] Furthermore, the angle between the extended line of the connecting part and the extended line of the hub's central axis is 25° to 30°. This optimizes airflow, increases air volume and pressure, reduces noise, enhances structural strength, improves energy transfer efficiency, increases stability, simplifies manufacturing processes, enhances aesthetics, and adapts to various application scenarios, thereby significantly improving the overall performance and user experience of the fan.

[0016] Compared with existing technologies, this invention has the following advantages: The inclined design of the connecting part and the hub forms an asymmetrical air inlet angle, which can generate a low-pressure vortex zone at the blade root and accelerate the airflow separation speed. Combined with the gradual curvature change formed by the bending of the outer edge of the central spiral section, a controllable transition from laminar to turbulent flow can be achieved, reducing boundary layer separation losses by approximately 15%-20%. By lowering the tail fin tip below the lower end of the hub and keeping it horizontal, a quasi-axial-centrifugal composite flow channel is formed. This structure increases the velocity vector of the outlet airflow and effectively suppresses secondary backflow. The concave structure of the first guide section can more precisely control the airflow direction, reduce vortices and turbulence, and make the airflow more concentrated and stable. The arrangement of the first and second guide sections allows the fan blades to form an axial-radial coupled composite flow channel system, which can effectively improve the airflow output, thereby increasing the overall airflow and air pressure. The Coriolis effect generated by the spiral layout enhances the axial momentum of the airflow, increasing the airflow by more than 35% compared to traditional planar blades. This structure is particularly suitable for high-flow-rate applications such as data center cooling systems and industrial ventilation equipment, meeting user needs. Attached Figure Description

[0017] To more clearly illustrate the technology 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a high-volume fan blade according to this utility model;

[0019] Figure 2 yes Figure 1 Another perspective illustration;

[0020] Figure 3 This is a side view of the present invention;

[0021] Figure 4 This is a schematic diagram illustrating the labeled parameters of the blade of this utility model;

[0022] Figure 5 This is a schematic diagram of the air duct of this utility model;

[0023] Figure 6 This is a schematic diagram of the airflow of this utility model.

[0024] The diagram includes:

[0025] 1. Hub; 11. Mounting hole; 12. Bushing; 121. Connecting slot; 13. Reinforcing member; 131. Reinforcing rib; 2. Blade; 21. Connecting part; 22. Central spiral part; 221. Bending outer edge; 222. Inner edge; 223. First air guide part; 224. Second air guide part; 225. Third air guide part; 23. Tail fin; 24. Blade tip. Detailed Implementation

[0026] The technology of this embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiment is one embodiment of the present invention, and not all embodiments thereof. Based on this embodiment of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0028] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second", such 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.

[0029] Please see Figures 1 to 6 This utility model provides a high-volume fan blade, including a hub 1 and multiple blades 2 arranged around the hub 1. A mounting hole 11 is provided through the center of the hub 1. In this embodiment, a bushing 12 is provided at the lower center of the hub 1, and the mounting hole 11 passes through the bushing 12. A connecting groove 121 for locking is provided on the bushing 12. During subsequent assembly, the motor output shaft of the fan is inserted into the mounting hole 11, and then the motor output shaft is locked by the locking pin engaging with the connecting groove 121.

[0030] In existing fans, the insufficient structure of the bushing 12 can lead to breakage, affecting the use of the fan. To avoid the above situation, in this embodiment, a reinforcing member 13 is connected to the outside of the bushing 12 and is arranged around it. The reinforcing member 13 is arranged along the outer surface of the bushing 12 and extends to the inner wall of the hub 1. A reinforcing rib 131 is provided on the reinforcing member 13. The design of the reinforcing member 13 significantly enhances the structural strength, rigidity, torsional performance and stability, and improves the overall performance and reliability.

[0031] To ensure sufficient airflow, seven blades 2 are arranged around the hub 1, which can provide sufficient airflow and air pressure while maintaining high aerodynamic efficiency. Of course, the number of blades 2 can be changed, such as 3 / 5 / 9 blades, depending on the actual needs.

[0032] Each blade 2 includes a connecting part 21, a central spiral part 22, and a tail fin 23 connected in sequence. The connecting part 21 is obliquely connected to the periphery of the hub 1, such as... Figure 3 As shown, the angle between the extended line of the connecting part 21 and the extended line of the central axis of the hub 1 is 25° to 30°. Preferably, the angle is 30° in this example, but it can also be set to 25°, 26°, 27°, 28°, and 29°, etc., as long as it is controlled within this angle range. This angle limitation allows for control of the tilt setting of the connecting part 21. In particular, in this embodiment, the middle spiral part 22 forms a bent outer edge 221, which allows the position of the tail wing 23 to be lower than the lower end of the hub 1. Furthermore, the middle spiral part 22 is spirally arranged so that the end of the tail wing 23 is folded in the opposite direction to the spiral direction of the middle spiral part 22. Figure 1 and Figure 2 As shown, the tail fin 23 is spirally arranged by the central helical section 22, and the end of the tail fin 23 forms a relatively straight blade tip 24. The line connecting the lower ends of the blade tips 24 of the seven blades 2 in the horizontal projection is parallel to the extension line of the upper end of the hub 1, thus forming a shape as shown. Figure 6 The air ducts in zones E and F shown, especially the addition of zone F compared to existing fan blades, can greatly increase the intake air volume, thereby improving the overall air volume.

[0033] Preferably, in this embodiment, the midpoint of the connection between the reinforcing member 13 and the inner wall of the hub 1 overlaps with the midpoint of the connection between the connecting part 21 and the hub 1. This arrangement, where the reinforcing member 13 and the connecting part 21 are positioned on opposite sides of the hub 1 wall and intersected, improves the strength of the fan blade structure and extends its service life.

[0034] The central vortex 22 includes a bent outer edge 221 and an inner edge 222. A concave first air guide 223 is formed between the bent outer edge 221 and the inner edge 222. A second air guide 224, communicating with the first air guide 223, is formed in the middle of the tail fin 23. Adding the second air guide 224 to the tail fin 23 allows it to form an acceleration channel together with the concave curved surface of the first air guide 223, thereby increasing wind speed. Furthermore, a third air guide 225 with a greater concave curvature than the first air guide 223 is formed between the first air guide 223 and the bent outer edge 221. The third air guide 225 extends to the tail fin 23 and communicates with the second air guide 224. Figure 3 As shown, the airflow undergoes a first axial acceleration through the first guide section 223 and the second guide section 224 before entering the third guide section 225. The concave curvature of the third guide section 225 is greater than that of the first guide section 223 and the second guide section 224, resulting in a second radial airflow adjustment, making the airflow more concentrated. Thus, the fan blade structure, by continuously integrating the first guide section 223 and the second guide section 224 from the inner edge 222 to the outer edge, forms an axial-radial coupled composite flow channel system, which can effectively improve the airflow output.

[0035] In this embodiment, the end of the tail fin 23 is an arc-shaped blade tip 24, such as Figure 4 As shown, the angle α1 formed by the intersection of the tangents of the horizontal projections of the two arcuate structures on both sides of the blade tip 24 is α1. The angle α1 ranges from 45° to 50°, for example, it can be 45°, 46°, 47°, 49°, or 50°, with 48° being a preferred setting. This structure optimizes the aerodynamic performance of the fan blades through aerodynamic shape optimization and active flow field control. The arcuate blade tip 24 design helps reduce air resistance, improves fan efficiency, and thus achieves higher airflow output. At the same time, a reasonable angle range can effectively reduce the noise generated when the fan blades rotate, improving the fan's quietness.

[0036] like Figure 4 As shown, the line connecting the midpoint A of the connection between the connecting part 21 and the hub 1 in the horizontal projection and the center point C of the hub 1 is L1, and the line connecting the tangent point Q1 of the blade tip 24 and the center point C of the hub 1 is L2. The angle between L1 and L2 is α2, and the angle range of α2 is 35° to 40°. For example, the angle of α2 can be 35°, 37°, 38°, 39°, 38.5° or 40°, etc. The preferred angle in this embodiment is 36°. This ensures that the spiral of the first air guide 223, the second air guide 224 and the third air guide 225 causes the tail fin 23 to fold back to a certain position, which enhances the airflow and effectively reduces the operating noise of the fan while increasing the air volume output, thus meeting the market demand for high air volume and low noise fans.

[0037] Through the above design, such as Figure 6 As shown, the airflow enters from the inner side of the arc blade tip 24 and the central swirl section 22 along 222. The first air guide section 223 and the second air guide section 224 have concave arc surface structures, which generate a primary Venturi effect. Therefore, the airflow will form the first axial acceleration after entering. Then, the arc of the third air guide section 225 is greater than that of the first air guide section 223 and the second air guide section 224, so that the airflow direction changes along the third air guide section 225 and flows out towards the front of the hub 1, thereby effectively improving the air volume output and meeting the customer's demand for large air volume.

[0038] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A high-volume fan blade, characterized in that, It includes a hub (1) and a plurality of blades (2) arranged around the hub (1), wherein a mounting hole (11) is provided through the center of the hub (1); Each blade (2) includes a connecting part (21), a central spiral part (22), and a tail fin (23) connected in sequence. The connecting part (21) is obliquely connected to the periphery of the hub (1). The central spiral part (22) includes a bent outer edge (221) and an inner edge (222). The bent outer edge (221) makes the position of the tail fin (23) lower than the lower end of the hub (1). The central spiral part (22) is spirally arranged so that the end of the tail fin (23) is reversed relative to the spiral direction of the central spiral part (22). A concave first air guide part (223) is formed between the bent outer edge (221) and the inner edge (222).

2. The high-volume fan blade according to claim 1, characterized in that, The tail fin (23) forms a second air guide (224) in the middle, which is connected to the first air guide (223).

3. A high-volume fan blade according to claim 2, characterized in that, A third air guide (225) with a concave arc greater than that of the first air guide (223) is formed between the first air guide (223) and the bent outer edge (221). The third air guide (225) extends to the tail fin (23) and communicates with the second air guide (224).

4. A high-volume fan blade according to claim 1, characterized in that, The end of the tail fin (23) is an arc-shaped blade tip (24), and the angle between the tangents of the horizontal projections of the arc structures on both sides of the blade tip (24) is α1, and the angle range of α1 is 45° to 50°.

5. A high-volume fan blade according to claim 4, characterized in that, The line connecting the midpoint A of the connection between the connecting part (21) and the hub (1) in the horizontal projection and the center point C of the hub (1) is L1, the line connecting the tangent point Q1 of the blade tip (24) and the center point C of the hub (1) is L2, the included angle between L1 and L2 is α2, and the angle range of α2 is 35° to 40°.

6. A high-volume fan blade according to claim 1, characterized in that, The number of blades (2) is 7.

7. A high-volume fan blade according to claim 1, characterized in that, The lower center of the hub (1) is provided with a bushing (12), the mounting hole (11) passes through the bushing (12), and a connecting groove (121) for snap-fit ​​is provided on the bushing (12).

8. A high-volume fan blade according to claim 7, characterized in that, The bushing (12) is connected to a reinforcing member (13) arranged around it. The reinforcing member (13) is arranged along the outer surface of the bushing (12) and extends to the inner wall of the hub (1). A reinforcing rib (131) is provided on the reinforcing member (13).

9. A high-volume fan blade according to claim 8, characterized in that, The midpoint of the connection between the reinforcing member (13) and the inner wall of the hub (1) coincides with the midpoint of the connection between the connecting part (21) and the hub (1).

10. A high-volume fan blade according to claim 1, characterized in that, The angle between the extension line of the connecting part (21) and the extension line of the central axis of the hub (1) is 25° to 30°.

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