Fan wheel and cooling fan with the same

Abstract

The application provides a fan wheel and a cooling fan with the fan wheel, which are used to solve the problem that the existing fan wheel is easy to form vortex when rotating, and the air volume is difficult to improve. It comprises a rotating shaft, a hub and a plurality of fan blades, the plurality of fan blades respectively have a proximal end and a distal end, the proximal end is connected to the hub, the fan blade has a bifurcated structure adjacent to the distal end, the bifurcated structure has a main wing and a small wing, the small wing has an air inlet side and a flow guide side, the small wing has an air inlet first end point on the air inlet side, the small wing has a flow guide first end point on the flow guide side, the air inlet first end point and the flow guide first end point are connected to the main wing, the air inlet first end point and the axis have a first radial distance, the flow guide first end point and the axis have a second radial distance, and the second radial distance is the same as the first radial distance.

Description

Technical Field

[0001] This invention relates to a wind-driving device, and more particularly to a fan wheel and a cooling fan having the fan wheel. Background Technology

[0002] The existing fan wheel has a shaft and a hub, which is connected to the shaft. The fan wheel also has multiple blades arranged around the hub. The rotation of the hub drives the multiple blades to rotate synchronously, thereby driving the multiple blades to generate airflow.

[0003] However, in the existing fan impeller, when the multiple blades rotate and disturb the airflow, the airflow generates different pressures and velocities above and below the multiple blades. The airflow above the multiple blades has a higher velocity and lower pressure, while the airflow below the multiple blades has a lower velocity and higher pressure. This causes the high-pressure airflow below the multiple blades to flow to the low-pressure area above the multiple blades and form vortices at the trailing edges of the multiple blades. This increases the rotational resistance of the multiple blades, making it difficult for the existing fan impeller to effectively increase the airflow.

[0004] In view of this, there is indeed a need to improve the existing fan wheels. Summary of the Invention

[0005] To address the aforementioned problems, the present invention aims to provide a fan wheel that can reduce the generation of eddy currents, thereby increasing airflow and saving energy.

[0006] A secondary objective of this invention is to provide a fan wheel that can improve wind-driving efficiency.

[0007] The directions or similar terms used throughout this invention, such as "front," "back," "left," "right," "top," "bottom," "inner," "outer," and "side," are mainly based on the directions in the accompanying drawings. These directions or similar terms are only used to assist in explaining and understanding the various embodiments of this invention and are not intended to limit this invention.

[0008] The use of the quantifiers “a” or “an” for components and parts described throughout this invention is for convenience and to provide the general meaning of the scope of the invention; in this invention, it should be interpreted as including one or at least one, and a single concept also includes plural cases, unless it clearly means otherwise.

[0009] The terms "combination," "integration," or "assembly" used throughout this invention mainly refer to the types of connections that allow for separation without damaging the components, or connections that make the components inseparable. These are options that those skilled in the art can choose based on the material of the components to be connected or the assembly requirements.

[0010] The fan wheel of the present invention includes: a rotating shaft having a central axis; a hub connected to the rotating shaft; and a plurality of fan blades arranged around the hub. Each fan blade has a proximal end and a distal end. The proximal end is connected to the hub. Each fan blade has a bifurcated structure adjacent to the distal end. The bifurcated structure has a main wing and a small wing. The small wing has an air inlet side and a flow guide side. The small wing has an air inlet first endpoint on the air inlet side and a flow guide first endpoint on the flow guide side. Both the air inlet first endpoint and the flow guide first endpoint are connected to the main wing. There is a first radial distance between the air inlet first endpoint and the central axis, and a second radial distance between the flow guide first endpoint and the central axis. The second radial distance is the same as the first radial distance.

[0011] The cooling fan of the present invention includes: a fan frame having a shaft tube; a stator located on the outer periphery of the shaft tube; and a fan wheel as described above, the fan wheel being rotatably disposed within the fan frame, the hub having a magnetic element opposite to the stator.

[0012] Therefore, the fan wheel and cooling fan having the fan wheel of the present invention, by utilizing the bifurcated structure, can suppress the backflow of airflow, thereby reducing the generation of eddies and ensuring that the airflow spun out by the multiple fan blades is less obstructed. Even when the motor is at a low speed, the multiple fan blades can generate effective airflow to maintain the predetermined air volume, thus having the effect of increasing air volume and saving energy.

[0013] The fan wheel can have a maximum radius, and the ratio of the first radial distance to the maximum radius can be 0.85 to 0.98. This allows the winglet to have a better size ratio and enables the multiple fan blades to maintain a predetermined airflow.

[0014] The winglet can have a second air inlet end point on the air inlet side, which is away from the main wing. The first air inlet end point and the second air inlet end point can be connected to form a straight line segment. This straight line segment can have an angle with the axis of rotation, which can be greater than or equal to 0 degrees and less than or equal to 89 degrees. In this way, the fan wheel can maintain better wind pressure and air volume when rotating, thus improving wind drive efficiency.

[0015] The included angle can be greater than or equal to 30 degrees and less than or equal to 89 degrees. In this way, the fan wheel can maintain better wind pressure and air volume when rotating, which has the effect of improving wind drive efficiency.

[0016] The included angle can be 60 degrees. In this way, the fan wheel can maintain optimal wind pressure and air volume when rotating, which has the effect of improving wind drive efficiency.

[0017] The winglet may have a second air inlet endpoint on the air inlet side and a second air guide endpoint on the airflow guiding side. Both the air inlet and air guide endpoints are located away from the main wing. A first distance may exist between the air inlet endpoint and the air guide endpoint, and a second distance may exist between the air inlet endpoint and the air guide endpoint. The first distance may be greater than or equal to the second distance. This design improves airflow smoothness.

[0018] The fan wheel can have a maximum radius, and the winglet and the axis can have a maximum radial distance, which can be less than or equal to the maximum radius. This reduces the overall radial width of the fan wheel. Attached Figure Description

[0019] Figure 1 : An exploded perspective view of a preferred embodiment of the cooling fan of the present invention;

[0020] Figure 2 A partial bottom view of a preferred embodiment of the fan wheel of the present invention;

[0021] Figure 3 : A perspective view of a preferred embodiment of the fan wheel of the present invention;

[0022] Figure 4 :like Figure 3 An enlarged cross-sectional view of A;

[0023] Figure 5 :like Figure 4 A magnified view of part A.

[0024] Explanation of reference numerals in the attached figures

[0025] [This Invention]

[0026] 1: Shaft

[0027] 2: Wheel hub

[0028] 21:Plate body

[0029] 22: Surrounding Wall

[0030] 23: Magnetic components

[0031] 3: Fan blades

[0032] 4: Sector frame

[0033] 41: Shaft tube

[0034] 5: Stator

[0035] 31: Main wing

[0036] 32: Little Wing

[0037] 32a: First air inlet point

[0038] 32b: First endpoint of the flow guide

[0039] 32c: Second air inlet point

[0040] 32d: Second endpoint of the flow guide

[0041] C: Axis

[0042] D1: First radial distance

[0043] D2: Second radial distance

[0044] D3: Maximum radial distance

[0045] G1: First spacing

[0046] G2: Second spacing

[0047] L: Line segment

[0048] P: Fan wheel

[0049] P1: Paraxial end

[0050] P2: Far axis end

[0051] R: Maximum radius

[0052] S: bifurcation structure

[0053] W1: Wind inlet side

[0054] W2: Flow guide side

[0055] θ: included angle. Detailed Implementation

[0056] To make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments of the present invention are described below in conjunction with the accompanying drawings; in addition, those symbols that are marked with the same symbols in different drawings are considered to be the same and their descriptions will be omitted.

[0057] Please refer to Figure 1 , Figure 3 As shown, this is a preferred embodiment of the fan wheel P of the present invention, including a rotating shaft 1, a hub 2, and a plurality of fan blades 3. The hub 2 is connected to the rotating shaft 1, and the plurality of fan blades 3 are arranged around the hub 2. It is worth mentioning that the present invention can be applied to fans of the type of blower fan or axial fan. Although this embodiment is described using an axial fan as an example, it is not limited thereto.

[0058] Please refer to Figure 3As shown, the rotating shaft 1 has a central axis C. The rotating shaft 1 is designed to drive the entire fan wheel P to rotate smoothly. The present invention does not limit the structural composition and appearance of the rotating shaft 1.

[0059] The central portion of the hub 2 can be joined to the shaft 1. This invention does not limit the material of the hub 2 or the structure and method of connecting the hub 2 to the shaft 1. For example, the hub 2 can be injection molded to encapsulate the shaft 1, or it can be joined to the shaft 1 by a tight fit or laser welding. In this embodiment, the hub 2 can be made of metal and laser welded to the shaft 1, ensuring a stable connection between the hub 2 and the shaft 1. The hub 2 can have a plate 21 and a ring wall 22. The shaft 1 is connected to the plate 21, and the ring wall 22 is connected to the periphery of the plate 21. The ring wall 22 can be integrally formed or assembled to the plate 21.

[0060] Please refer to Figure 2 , Figure 3 As shown, the plurality of fan blades 3 are connected to the annular wall 22 of the hub 2. The plurality of fan blades 3 and the hub 2 can be connected by snap-fitting, bonding, fitting, or integral molding, etc., and the present invention is not limited thereto. In this embodiment, the plurality of fan blades 3 and the hub 2 can be integrally connected by injection molding to improve structural strength and production efficiency. The plurality of fan blades 3 each have a proximal end P1 and a distal end P2. The fan blade 3 is connected to the hub 2 by the proximal end P1. The fan blade 3 has a bifurcated structure S, which is adjacent to the distal end P2.

[0061] In detail, the bifurcated structure S has a main wing 31 and a small wing 32. The main wing 31 can be located above the small wing 32, and the small wing 32 can be integrally connected to the main wing 31. The small wing 32 has an air inlet side W1 and a flow guide side W2. The small wing 32 has an air inlet first endpoint 32a on the air inlet side W1 and a flow guide first endpoint 32b on the flow guide side W2. Both the air inlet first endpoint 32a and the flow guide first endpoint 32b are connected to the main wing 31. There is a first radial distance D1 between the air inlet first endpoint 32a and the axis C, and a second radial distance D2 between the flow guide first endpoint 32b and the axis C. The second radial distance D2 is the same as the first radial distance D1.

[0062] Please refer to Figure 2As shown, the fan wheel P can have a maximum radius R, and the ratio of the first radial distance D1 to the maximum radius R (D1 / R) can be 0.85 to 0.98, so that the winglet 32 ​​can have a better size ratio, and the multiple fan blades 3 can maintain a predetermined airflow. In this embodiment, the ratio of the first radial distance D1 to the maximum radius R (D1 / R) can be selected as 0.95. Furthermore, the winglet 32 ​​and the axis C can have a maximum radial distance D3, which is preferably less than or equal to the maximum radius R, thereby reducing the overall radial width of the fan wheel P.

[0063] Please refer to Figure 3 , Figure 4 , Figure 5 As shown, the winglet 32 ​​may have a second air inlet endpoint 32c on the air inlet side W1 and a second air guide endpoint 32d on the air guide side W2. The first air inlet endpoint 32a is radially closer to the pivot 1 than the second air inlet endpoint 32c, and the first air guide endpoint 32b is radially closer to the pivot 1 than the second air guide endpoint 32d. That is, the second air inlet endpoint 32c and the second air guide endpoint 32d are far from the main wing 31, and neither the second air inlet endpoint 32c nor the second air guide endpoint 32d is connected to the main wing 31. There may be a first gap G1 between the first air inlet endpoint 32a and the first air guide endpoint 32b, and a second gap G2 between the second air inlet endpoint 32c and the second air guide endpoint 32d. The first gap G1 may be greater than or equal to the second gap G2, which can improve the smoothness of airflow.

[0064] Furthermore, the first air inlet end point 32a and the second air inlet end point 32c can be connected to form a straight line segment L. The straight line segment L can have an angle θ with the axis C of the rotating shaft 1. The angle θ can be greater than or equal to 0 degrees and less than or equal to 89 degrees. Preferably, the angle θ can be greater than or equal to 30 degrees and less than or equal to 89 degrees. More preferably, the angle θ can be 60 degrees. This ensures that the fan wheel P maintains the best wind pressure and air volume when rotating, which has the effect of improving the overall wind drive efficiency.

[0065] Please refer to Figure 1 , Figure 3As shown, in a cooling fan with the fan wheel P of the above embodiment, the cooling fan has a fan frame 4, the fan frame 4 has a shaft tube 41, the fan wheel P can be assembled into the shaft tube 41 by the rotating shaft 1, a stator 5 is located on the outer periphery of the shaft tube 41, the hub 2 has a magnetic element 23, the magnetic element 23 can be located inside the ring wall 22, and the magnetic element 23 is opposite to the stator 5. Since the fan blade 3 has the bifurcated structure S, the bifurcated structure S is adjacent to the far-axis end P2, and the second radial distance D2 is the same as the first radial distance D1; when the fan wheel P rotates, it can suppress the airflow from below the multiple fan blades 3 to above the multiple fan blades 3, thereby reducing the generation of eddy currents, increasing the air volume, and ensuring that the airflow spun out by the multiple fan blades 3 is less obstructed. Therefore, even when the motor is at a low speed, the multiple fan blades 3 can generate effective airflow to maintain the predetermined air volume, which can also save energy.

[0066] In summary, the fan wheel and cooling fan with the fan wheel of the present invention, by utilizing the bifurcated structure, can suppress the backflow of airflow, thereby reducing the generation of eddies and ensuring that the airflow generated by the multiple fan blades is less obstructed. Even when the motor is at a low speed, the multiple fan blades can generate effective airflow to maintain the predetermined air volume, thus improving air volume and saving energy.

Claims

1. A fan wheel for an axial fan, characterized in that, include: A pivot has a central axis; A hub, connected to the axle; and Multiple fan blades are arranged around the hub. Each fan blade has a near-axial end and a far-axial end. The near-axial end is connected to the hub. Each fan blade has a forked structure adjacent to the far-axial end. The forked structure has a main wing and a small wing. The small wing has an air inlet side and a guide side. The small wing has an air inlet first endpoint on the air inlet side and a guide first endpoint on the guide side. Both the air inlet first endpoint and the guide first endpoint are connected to the main wing. There is a first radial distance between the air inlet first endpoint and the axis, and a second radial distance between the guide first endpoint and the axis. The second radial distance is the same as the first radial distance. The winglet has a second air inlet end point on the air inlet side and a second air guide end point on the air guide side. The second air inlet end point and the second air guide end point are far away from the main wing. The first air inlet end point and the second air inlet end point are connected to form a straight line segment. The straight line segment has an angle with the axis of rotation. The angle is greater than or equal to 0 degrees and less than or equal to 89 degrees. The first air inlet end point and the first air guide end point have a first gap. The second air inlet end point and the second air guide end point have a second gap. The first gap is greater than or equal to the second gap.

2. The fan wheel as described in claim 1, characterized in that, The fan wheel has a maximum radius, and the ratio of the first radial distance to the maximum radius is 0.85 to 0.

98.

3. The fan wheel as described in claim 1, characterized in that, The included angle is greater than or equal to 30 degrees and less than or equal to 89 degrees.

4. The fan wheel as described in claim 1, characterized in that, The included angle is 60 degrees.

5. The fan wheel as described in claim 1, characterized in that, The fan wheel has a maximum radius, and the winglet has a maximum radial distance from the axis, which is less than or equal to the maximum radius.

6. A cooling fan, characterized in that, include: A sector frame with a shaft tube; A stator is located on the outer periphery of the shaft tube; and A fan wheel as described in any one of claims 1 to 5, the fan wheel being rotatably disposed within the fan frame, the hub having a magnetic element opposite to the stator.

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