Fan wheel and cooling fan

Abstract

A fan impeller is disclosed to address the problem of turbulence generated by existing fan impellers. It includes: a hub having a top plate and a ring wall connected to the top plate, the ring wall surrounding a circumferential portion; a first blade group having a plurality of first blades connected to the circumferential portion; and a second blade group having a plurality of second blades connected to the ring wall, the second blades not connected to the circumferential portion, the second blade group located between the ring wall and the first blade group. This invention also relates to a cooling fan. This can improve airflow efficiency and reduce noise.

Description

Technical Field

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

[0002] Existing fan wheels have a hub with a base plate and a central protrusion. Several blades are attached to the periphery of the base plate and are arranged around the central protrusion. The rotation of the hub drives the blades to rotate synchronously, thereby generating airflow. However, in the aforementioned existing fan wheels, when the rotating blades disturb the airflow, the airflow between the blades and the central protrusion becomes chaotic, easily generating turbulence, which in turn causes airflow obstruction and noise generation.

[0003] In view of this, there is indeed a need to improve the existing fan wheels. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this invention is to provide a fan wheel that can improve the smoothness of airflow.

[0005] The directional terms or similar terms used throughout this utility model, such as "front", "back", "left", "right", "top", "bottom", "inner", "outer", "side", etc., are mainly for reference to the directions in the accompanying drawings. Each directional term or similar term is only used to assist in explaining and understanding the various embodiments of this utility model and is not intended to limit this utility model.

[0006] The use of the quantifiers “a” or “an” for the elements and components described throughout this utility model is merely for convenience and to provide the general meaning of the scope of this utility model; in this utility model, it should be interpreted as including one or at least one, and a single concept also includes multiple cases, unless it clearly means otherwise.

[0007] The terms “first,” “second,” … and “Nth” used throughout this utility model are mainly used to distinguish different elements or features (such as elements, directions, or steps), and do not indicate the maximum or minimum number of these elements or features possessed by a corresponding subject or method, nor do they limit the order of priority.

[0008] The terms "combination," "integration," or "assembly" used throughout this utility model mainly include those that allow for separation without damaging the components after connection, or those that make the components inseparable after connection. Those skilled in the art can choose the appropriate term based on the material of the components to be connected or the assembly requirements.

[0009] The fan wheel of this utility model includes: a hub having a top plate and a ring wall connected to the top plate, the ring wall surrounding a circumferential portion; a first blade group having a plurality of first fan blades connected to the circumferential portion; and a second blade group having a plurality of second fan blades connected to the ring wall, the plurality of second fan blades not connected to the circumferential portion, the second blade group being located between the ring wall and the first blade group.

[0010] Therefore, the fan wheel of this utility model, by having the first blade group and the second blade group, wherein the second blade group is located between the ring wall and the first blade group and the second blade group is not in contact with the ring circumference, can guide the airflow entering between the first blade group and the ring wall, thereby reducing the backflow between the first blade group and the ring wall, and allowing the airflow to flow smoothly out from the air outlet of the first blade group, thus achieving the effects of improving airflow efficiency and reducing noise.

[0011] The circumferential portion has a first surface and a second surface facing each other. The first blade group is located on the first surface, and several first blades of the first blade group are radially aligned with the annular wall. Thus, the space between the first blade group and the annular wall can accommodate the second blade group to guide airflow.

[0012] Each of the first blades has an axially opposite top edge and a bottom edge, the bottom edge not extending beyond the second surface of the circumferential portion. This ensures that each of the first blades does not create turbulence on the airflow over the second surface of the circumferential portion.

[0013] Each first blade has a radially opposite air inlet and an air outlet, with the air inlet facing the annular wall and a radial distance between the air inlet and the annular wall. This allows for an appropriate distance between the air inlet and the annular wall to accommodate the function of the second blade assembly.

[0014] The number of the second blades is less than the number of the first blades in the first blade group. Thus, the second blades can improve the smoothness of the airflow.

[0015] Each first fan blade has a radially opposite air inlet end and an air outlet end, and each second fan blade has a radially opposite first end and a second end. The direction in which the curved surface of the first end of each second fan blade extends toward the second end is opposite to the direction in which the curved surface of the air inlet end of each of the plurality of first fan blades extends toward the air outlet end. In this way, the second fan blade can improve the smoothness of the airflow field.

[0016] Each first blade has a radially opposite air inlet and an air outlet, and each second blade has a radially opposite first end and a second end. The first end of each second blade is attached to the annular wall. The air inlet of each first blade forms a virtual first circumference, and the second end of each second blade forms a virtual second circumference. There is a radial distance between the first circumference and the second circumference. In this way, an appropriate distance can be formed between the second blade group and the first blade group to smoothly guide the airflow.

[0017] Each second blade has a first end and a second end that are radially opposite each other. A first radius is formed from the center of the fan wheel to the first end of each second blade, a second radius is formed from the center of the fan wheel to the second end of each second blade, and a third radius is formed from the center of the fan wheel to its maximum outer diameter. The ratio of the difference between the second radius and the first radius to the difference between the third radius and the first radius is 0.075 to 0.525. Thus, the second blade assembly can reduce backflow between the first blade assembly and the annular wall, allowing airflow to smoothly exit from the outlet end of the first blade assembly, thereby improving airflow efficiency and reducing noise.

[0018] Each of the second fan blades has an upper edge and a lower edge that are axially opposite each other, with the upper edge being lower than the top surface of the top plate in the axial direction. In this way, the axial height of the fan wheel can be reduced, achieving the effect of thinning.

[0019] Each of the second blades has an axially opposite upper edge and a lower edge, with an axial distance of 0.5 to 5 mm between the lower edge and the circumferential portion. This creates a space between the lower edge of each second blade and the circumferential portion to guide airflow, thereby increasing airflow rate.

[0020] The circumferential portion has a first surface and a second surface facing each other, and a plurality of air holes extending through the first surface and the second surface. Each air hole is axially aligned with each of the second fan blades. In this way, airflow can be introduced from below the hub through the plurality of air holes to improve the efficiency of the airflow output by the fan wheel.

[0021] In this design, the outline of each air hole in the axial direction is larger than the outline of the second blade, and the distance between the edge of the air hole and the periphery of the second blade is at least 0.2 mm. This allows airflow to easily enter the hub through each air hole.

[0022] In this configuration, at least a portion of each second fan blade is located within each air hole, and each second fan blade does not protrude from the second surface of the circumferential portion. This enhances the efficiency of airflow introduced from below the hub.

[0023] The axial distance between the lower edge of each second blade and the air hole is 0.5–5 mm. This improves the efficiency of airflow introduced from below the hub.

[0024] Each air vent has a profile corresponding to the axial projection of each second blade. In this way, each air vent can form a gap with the periphery of the second blade, allowing airflow to easily enter the hub through each air vent.

[0025] The present invention discloses a cooling fan comprising: a fan frame; and the aforementioned fan wheel, which is rotatably located within the fan frame. Thus, the cooling fan can achieve better airflow efficiency and lower noise. Attached Figure Description

[0026] Figure 1 : A perspective view of the first embodiment of this utility model; Figure 2 : Front view of the first embodiment of this utility model; Figure 3 :along Figure 2 AA-line cross-section; Figure 4 : A perspective view of the second embodiment of this utility model; Figure 5 : Front view of the second embodiment of this utility model; Figure 6 :along Figure 5 BB line cross-section; Figure 7 Bottom view of the second embodiment of this utility model; Figure 8 :like Figure 7 The enlarged view of the local structure at point C is shown. Figure 9 : An exploded perspective view of the second embodiment of this utility model for a cooling fan.

[0027] Explanation of reference numerals in the attached figures: 1: Wheel hub 11: Shaft 12: Top Slab 12a: Top surface 13: Encircling wall 14: Shaft connection convex part 15: Circumferential part 15a: First surface 15b: Second surface 16: Stomata 2: First blade group 2a: First blade 21: Top edge 22: Bottom edge 23: Air Inlet 24: Air outlet 25: Connecting ring 3: Second blade group 3a: Second blade 31: First End 32: Second End 33: Upper edge 34: Lower edge 4: Sector frame 41: Base 42: Top Cover 43: Shaft tube P: Fan wheel F: Cooling fan O: Center S: Storage space D: Spacing T1: First circumference T2: Second circumference R1: First radius R2: Second radius R3: Third radius H: Axial spacing. Detailed Implementation

[0028] To make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments of this utility model are described below in detail with reference to 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.

[0029] Please refer to Figure 1 , Figure 2 As shown, it is the first embodiment of the fan wheel P of this utility model, including a hub 1, a first blade group 2 and a second blade group 3, wherein the first blade group 2 and the second blade group 3 are respectively located in the hub 1.

[0030] The hub 1 has a pivot 11 at its center O. The hub 1 can be injection-molded to encapsulate the pivot 11, or the hub 1 can be joined to the pivot 11 by means of tight fit or laser welding. In this embodiment, the hub 1 may have a top plate 12 and a ring wall 13. The ring wall 13 is connected to the periphery of the top plate 12 and extends axially, so that the top plate 12 and the ring wall 13 can together form an accommodating space S. Preferably, the top plate 12 may have a shaft-connecting protrusion 14, which protrudes from the inner surface of the top plate 12, so that the shaft-connecting protrusion 14 can be located in the accommodating space S. The shaft-connecting protrusion 14 can be used to connect to the pivot 11 to increase the contact area between the top plate 12 and the pivot 11, thereby giving the top plate 12 and the pivot 11 a better connection stability.

[0031] The hub 1 may have a circumferential portion 15, which may be attached to the ring wall 13 such that the circumferential portion 15 surrounds the outer periphery of the ring wall 13, thereby forming the base plate of the hub 1. The circumferential portion 15 may be a ring piece, which may be integrally formed with the ring wall 13, or the circumferential portion 15 may be attached to the ring wall 13 by, for example, welding. In this embodiment, the top plate 12 and the circumferential portion 15 are located at opposite ends of the ring wall 13 in the axial direction.

[0032] The first blade assembly 2 may have several first blades 2a, which may be attached to the circumferential portion 15 so that the several first blades 2a surround the hub 1. For example, the several first blades 2a may be made of plastic, and the circumferential portion 15 may be injection molded together with the several first blades 2a; or, the several first blades 2a may be made of metal, and the circumferential portion 15 may be injection molded to cover one end of each first blade 2a.

[0033] Please refer to Figure 2 , Figure 3 As shown, in this embodiment, the circumferential portion 15 has a first surface 15a and a second surface 15b facing each other. The first blade group 2 is located on the first surface 15a, such that the plurality of first blades 2a of the first blade group 2 can be radially aligned with the annular wall 13. Further, each first blade 2a may have a top edge 21 and a bottom edge 22, the top edge 21 and the bottom edge 22 being axially opposite each other. The bottom edge 22 may not extend beyond the second surface 15b of the circumferential portion 15, and the bottom edge 22 is preferably flush with the second surface 15b. Each first blade 2a may have an air inlet end 23 and an air outlet end 24, the air inlet end 23 and the air outlet end 24 being located at the radially opposite ends of each first blade 2a, the air inlet end 23 facing the annular wall 13, and there may be a radial distance between the air inlet end 23 and the annular wall 13.

[0034] The plurality of first blades 2a can be connected by a connecting ring 25, which can be located between the top edge 21 and the bottom edge 22, or the connecting ring 25 can be attached to the top edge 21. The connecting ring 25 can be adjacent to the air outlet end 24 of each first blade 2a. In this way, the connecting ring 25 can further improve the stability of the first blade assembly 2 to prevent the first blade assembly 2 from vibrating under high-speed operation.

[0035] Please continue reading. Figure 1 , Figure 2 As shown, the second blade group 3 is located between the annular wall 13 and the first blade group 2, and the second blade group 3 can guide the airflow between the annular wall 13 and the first blade group 2. The second blade group 3 may have a plurality of second blades 3a, which can be combined with the annular wall 13 so that the plurality of second blades 3a can be arranged around the hub 1. Specifically, each second blade 3a may have a first end 31 and a second end 32, which are respectively located at the radially opposite ends of each second blade 3a. The first end 31 is connected to the annular wall 13, so that each second blade 3a is not connected to the circumferential portion 15. The second end 32 faces the first blade group 2, and the number of second blades 3a is less than the number of first blades 2a in the first blade group 2.

[0036] Please continue reading. Figure 2 As shown, further, the air inlet end 23 of each first blade 2a can form a virtual first circumference T1, and the second end 32 of each second blade 3a can form a virtual second circumference T2. There is a radial distance between the first circumference T1 and the second circumference T2. In this way, an appropriate distance can be formed between the second blade group 3 and the first blade group 2. Preferably, each second blade 3a extends in a vortex-like direction relative to the center O, that is, the direction in which the curved surface of the first end 31 toward the second end 32 extends along the radial contour of the second blade 3a. This is opposite to the direction in which the curved surface of the air inlet end 23 toward the air outlet end 24 extends in a vortex-like direction relative to the center O, that is, the direction in which the curved surface of the air inlet end 23 extends along the radial contour of the first blade 2a. This has the effect of smoothly guiding the airflow.

[0037] Preferably, the distance from the center O of the fan wheel P to the first end 31 of each second fan blade 3a can have a first radius R1, the distance from the center of the fan wheel P to the second end 32 of each second fan blade 3a can have a second radius R2, and the distance from the center of the fan wheel P to the maximum outer diameter of the fan wheel P can have a third radius R3, wherein 0.075 ≤ (R2-R1) / (R3-R1) ≤ 0.525. Thus, the second blade assembly 3 can have a better radial length dimension, thereby increasing airflow and static pressure.

[0038] Please continue reading. Figure 1 , Figure 3 As shown, it is worth noting that each second blade 3a of the second blade group 3 may have an upper edge 33 and a lower edge 34, with the upper edge 33 and the lower edge 34 axially opposite each other. Axially, the upper edge 33 is lower than the top surface 12a of the top plate 12, and the lower edge 34 does not contact the circumferential portion 15. Furthermore, there may be an axial distance H between the lower edge 34 and the first surface 15a of the circumferential portion 15, which may be 0.5–5 mm. Thus, a space for guiding airflow can be further formed between the lower edge 34 of each second blade 3a and the circumferential portion 15, thereby increasing the airflow rate.

[0039] Please refer to Figure 4 , Figure 5 , Figure 6 As shown, this is a second embodiment of the fan wheel P of this utility model. Compared with the first embodiment, in this embodiment, the circumferential portion 15 has several air holes 16. These air holes 16 penetrate the first surface 15a and the second surface 15b of the circumferential portion 15. Each air hole 16 is axially aligned with each second fan blade 3a, and each air hole 16 may have a hole shape that approximately corresponds to each second fan blade 3a (i.e., the outline of the axial projection of the second fan blade 3a). In this way, airflow can be introduced from below the hub 1 through these air holes 16 to increase the airflow output of the fan wheel P.

[0040] Please refer to Figure 7 , Figure 8 As shown, further, the outline of each air hole 16 in the axial direction can be slightly larger than the outline of the second blade 3a. Preferably, the distance D between the edge of the air hole 16 and the periphery of the second blade 3a in the axial direction can be at least 0.2 mm. This allows airflow to easily enter the hub 1 through each air hole 16. Furthermore, the lower edge 34 of each second blade 3a can be located within each air hole 16, so that the lower edge 34 can extend into the air hole 16. Preferably, each lower edge 34 does not protrude from the second surface 15b of the circumferential portion 15, or the lower edge 34 can have the aforementioned axial distance H with the air hole 16. This can enhance the flow rate of air introduced from below the hub 1.

[0041] Please refer to Figure 9 As shown, in the above embodiment, the fan wheel P can be disposed in a fan frame 4 of a cooling fan F. The fan frame 4 can have a base 41 and a top cover 42 combined together. The base 41 has a shaft tube 43, which can be used to accommodate the bearing and the rotating shaft 11 of the fan wheel P, so that the fan wheel P is rotatably located in the fan frame 4. The base 41 can also have a motor stator, through which the fan wheel P is driven to rotate.

[0042] In summary, the fan wheel of this utility model, by having the first blade group and the second blade group, wherein the second blade group is located between the ring wall and the first blade group and the second blade group is not in contact with the ring circumference, can guide the airflow entering between the first blade group and the ring wall, thereby reducing the backflow between the first blade group and the ring wall, and allowing the airflow to flow smoothly out from the air outlet of the first blade group, thus achieving the effects of improving airflow efficiency and reducing noise.

[0043] Although the present invention has been disclosed using the above-described preferred embodiments, it is not intended to limit the present invention. Any modifications and alterations made by those skilled in the art to the above embodiments without departing from the spirit and scope of the present invention shall still fall within the technical scope protected by the present invention. Therefore, the protection scope of the present invention shall include all modifications within the meaning and equivalent scope of the appended claims. Furthermore, when the above-described embodiments can be combined, the present invention includes any combination of embodiments.

Claims

1. A fan wheel, characterized in that, include: A hub having a top plate and a ring wall connected to the top plate, the ring wall surrounding a circumferential portion; A first blade group having a plurality of first blades joined together in the circumferential portion; and A second blade group having a plurality of second blades attached to the annular wall, the plurality of second blades not connected to the annular portion, the second blade group being located between the annular wall and the first blade group.

2. The fan wheel as described in claim 1, characterized in that, The circumferential portion has a first surface and a second surface opposite to each other, the first blade group is located on the first surface, and several first blades of the first blade group are radially aligned with the annular wall.

3. The fan wheel as described in claim 2, characterized in that, Each first blade has an axially opposite top edge and a bottom edge, the bottom edge not extending beyond the second surface of the circumferential portion.

4. The fan wheel as described in claim 1, characterized in that, Each first fan blade has a radially opposite air inlet end and an air outlet end, the air inlet end facing the ring wall, and there is a radial distance between the air inlet end and the ring wall.

5. The fan wheel as described in claim 1, characterized in that, The number of the second blades is less than the number of the first blades in the first blade group.

6. The fan wheel as described in claim 1, characterized in that, Each first fan blade has a radially opposite air inlet end and an air outlet end, and each second fan blade has a radially opposite first end and a second end. The extension direction of the curved surface of the first end of each second fan blade toward the second end is opposite to the extension direction of the curved surface of the air inlet end of each plurality of first fan blades toward the air outlet end.

7. The fan wheel as described in claim 1, characterized in that, Each first fan blade has a radially opposite air inlet end and an air outlet end, and each second fan blade has a radially opposite first end and a second end. The second end of each second fan blade is attached to the ring wall. The air inlet end of each first fan blade forms a virtual first circumference, and the second end of each second fan blade forms a virtual second circumference. There is a radial distance between the first circumference and the second circumference.

8. The fan wheel as described in claim 1, characterized in that, Each second blade has a first end and a second end that are radially opposite each other. The center of the fan wheel has a first radius to the first end of each second blade, the center of the fan wheel has a second radius to the second end of each second blade, and the center of the fan wheel has a third radius to the maximum outer diameter of the fan wheel. The ratio of the difference between the second radius and the first radius to the difference between the third radius and the first radius is 0.075 to 0.

525.

9. The fan wheel as described in claim 1, characterized in that, Each second blade has an upper edge and a lower edge that are axially opposite each other, with the upper edge being lower than the top surface of the top plate in the axial direction.

10. The fan wheel as described in claim 1, characterized in that, Each second blade has an axially opposite upper edge and a lower edge, and there is an axial distance between the lower edge and the circumferential portion, which is 0.5 to 5 mm.

11. The fan wheel as described in claim 1, characterized in that, The circumferential portion has a first surface and a second surface opposite to each other. The circumferential portion has several air holes that penetrate the first surface and the second surface. Each air hole is axially aligned with each second fan blade.

12. The fan wheel as described in claim 11, characterized in that, The outline of each air hole in the axial direction is larger than the outline of the second blade, and the distance between the edge of the air hole and the periphery of the second blade is at least 0.2 mm.

13. The fan wheel as described in claim 11, characterized in that, At least a portion of each second blade is located within each air hole, and each second blade does not protrude from the second surface of the circumferential portion.

14. The fan wheel as described in claim 11, characterized in that, The axial distance between the lower edge of each second blade and the air hole is 0.5 to 5 mm.

15. The fan wheel as described in claim 11, characterized in that, Each vent has a profile corresponding to the axial projection of each second blade.

16. A cooling fan, characterized in that, include: A sector frame; and A fan wheel as claimed in any one of claims 1 to 15, the fan wheel being rotatably located in the fan frame.

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