Fan wheel and cooling fan with same

Abstract

A fan wheel and a cooling fan with the fan wheel are used for solving the problem that an existing fan wheel is poor in airflow flowing smoothness. The fan wheel comprises: a hub; the fan blades are arranged around the hub, each fan blade is provided with a blade root end and a blade tail end which are opposite to each other, each blade root end is connected with the hub, and each fan blade is provided with a windward side and a leeward side; the fan blade comprises a plurality of fan blades, a blade root end and a blade tail end, and a plurality of convex blocks distributed on the fan blades, the convex blocks are positioned between the blade root end and the blade tail end, the convex blocks are far away from the blade root end and are close to the blade tail end, the windward side and the leeward side of each fan blade are respectively provided with at least one convex block, and the convex block positioned on the windward side and the convex block positioned on the leeward side are positioned at different axial heights. Therefore, the air volume can be increased and the fan operation noise can be reduced.

Description

Technical Field

[0001] The utility model relates to a wind driving device, in particular to a fan wheel and a heat dissipation fan with the fan wheel. Background Art

[0002] The existing fan wheel is connected to a hub by a rotating shaft, and the hub has a side wall. The several fan blades of the fan wheel are respectively connected to the outer wall of the side wall by one end; thus, the cooling fan with the existing fan wheel can be assembled and positioned in a system such as a laptop computer, air conditioner or ventilation equipment to drive wind through the several fan blades to generate airflow.

[0003] Although the above-mentioned existing impeller can be used to drive airflow; however, since the entire surface of the several blades from the root to the tail is flat, it is easy to form turbulence when the airflow is large, so the airflow flowing into the two adjacent blades will be more turbulent, resulting in poor smoothness of the airflow in and out of the fan, making it difficult to effectively increase the air volume of the existing impeller and reduce the operating noise.

[0004] In view of this, the existing impeller still needs to be improved. Utility Model Content

[0005] In order to solve the above problems, the purpose of the utility model is to provide a fan wheel and a heat dissipation fan having the fan wheel, which can reduce the operating noise of the fan.

[0006] Another object of the present invention is to provide a fan wheel and a heat dissipation fan having the fan wheel, which can increase the air volume.

[0007] Another object of the utility model is to provide a fan wheel and a heat dissipation fan having the fan wheel, which can make the air flow smoothly.

[0008] Another object of the present invention is to provide a fan wheel and a heat dissipation fan having the fan wheel, which can improve the rotation stability of the fan wheel.

[0009] The directions or their approximate terms described throughout the present invention, such as "front", "rear", "left", "right", "upper (top)", "lower (bottom)", "inside", "outside", "side", etc., mainly refer to the directions of the accompanying drawings, and each direction or its approximate terms are only used to assist in the explanation and understanding of the various embodiments of the present invention, and are not used to limit the present invention.

[0010] The quantifiers “a” or “an” used in the elements and components described throughout the present invention are only for convenience of use and to provide a general meaning of the scope of the present invention; in the present invention, they should be interpreted as including one or at least one, and a single concept also includes multiple situations, unless it is obvious that it means otherwise.

[0011] The similar terms such as "combination", "assembly" or "assembly" mentioned throughout the present invention mainly include the connection that can be separated without damaging the components, or the connection that makes the components inseparable. Those skilled in the art can choose according to the materials of the components to be connected or the assembly requirements.

[0012] The fan wheel of the utility model comprises: a hub; a plurality of fan blades, which are arranged around the hub, each fan blade has a blade root end and a blade tail end opposite to each other, each blade root end is connected to the hub, each fan blade has a windward surface and a leeward surface; and a plurality of protrusions, which are distributed on the plurality of fan blades, the plurality of protrusions are located between the blade root end and the blade tail end, the plurality of protrusions are farther away from the blade root end and closer to the blade tail end, the windward surface and the leeward surface of each fan blade respectively have at least one such protrusion, and the protrusion located on the windward surface and the protrusion located on the leeward surface are located at different axial heights.

[0013] The utility model discloses a heat dissipation fan, comprising: a fan frame, provided with a base, the base having a shaft tube; a stator, located at the outer periphery of the shaft tube; and the aforementioned fan wheel, the fan wheel being rotatably arranged on the shaft tube.

[0014] Therefore, the fan wheel of the utility model and the cooling fan having the fan wheel, since the windward side and the leeward side of each fan blade respectively have at least one protrusion, the airflow flowing into two adjacent fan blades can flow through each protrusion to form a diversion, which can reduce the formation of turbulence or wind shear, thereby increasing the air volume and ensuring that the airflow rotated out by the several fan blades is not obstructed, and can simultaneously have the effect of increasing the air volume and reducing the operating noise of the fan.

[0015] Each fan blade may have a top edge and a bottom edge opposite to each other, and the protrusion located on the windward side may be closer to the bottom edge of each fan blade than the protrusion located on the leeward side. In this way, the fan wheel can maintain a better wind pressure and wind volume when rotating, which has the effect of improving the wind driving efficiency. However, in the present invention, the protrusion located on the leeward side may be closer to the bottom edge of each fan blade than the protrusion located on the windward side.

[0016] A flow channel can be formed between two adjacent blades, and each flow channel can pass through to the tail end of the blade, so that the airflow can easily flow out from the tail end of the blade, which has the effect of making the airflow flow smoothly.

[0017] There may be a first minimum distance between the convex block on the windward side and the bottom edge of the blade, and a second minimum distance between the convex block on the leeward side and the top edge of the blade, and the second minimum distance may be equal to the first minimum distance. In this way, the fan wheel can maintain better wind pressure and wind volume when rotating, which has the effect of improving wind driving efficiency.

[0018] There may be a third minimum distance between the convex block on the windward side and the top edge of the blade, and a fourth minimum distance between the convex block on the leeward side and the bottom edge of the blade, and the fourth minimum distance may be equal to the third minimum distance. In this way, the fan wheel can maintain better wind pressure and wind volume when rotating, which has the effect of improving wind driving efficiency.

[0019] Each protrusion may have a height, a flow channel may be formed between two adjacent blades, and an axial distance may be provided between two protrusions in the same flow channel, and the axial distance may be less than or equal to the height and greater than or equal to 0.75 times the height. In this way, airflow may easily flow through each protrusion, thereby achieving the effect of smoothing the airflow.

[0020] The number of the fan blades may be 50 to 150. In this way, the thinned fan blades can generate sufficient air volume, thereby improving the wind-dispelling effect.

[0021] Each protrusion may have a length, and each protrusion may have a radial distance to the blade tail end of the fan blade, and the radial distance may be less than or equal to 0.5 times of the length and greater than or equal to 0. In this way, it can be ensured that the airflow first flows through the protrusions and then flows out from the blade tail end, which has the effect of avoiding the formation of turbulence or wind shear.

[0022] Each protrusion may have a width, a flow channel may be formed between two adjacent blades, and a gap may be provided between two protrusions in the same flow channel, and the gap may be greater than or equal to the width and less than or equal to 2.5 times the width. In this way, there may be enough gap for airflow to pass through, which has the effect of making the airflow flow smoothly.

[0023] The thickness of each fan blade can be less than or equal to 0.3 mm. In this way, the overall thinness of the fan can be maintained, while the weight of the overall fan wheel can be avoided to be too heavy, which has the effect of improving the operating efficiency.

[0024] There may be two or more protrusions on the windward side and two or more protrusions on the leeward side, and the projections of the protrusions on the windward side in the axial direction completely or partially overlap, and the projections of the protrusions on the leeward side in the axial direction completely or partially overlap. In this way, the airflow flowing into two adjacent blades can flow through each protrusion and form a split flow, thereby avoiding the formation of turbulence or wind shear, and having the effect of reducing airflow noise.

[0025] There can be two or more protrusions on the windward side and two or more protrusions on the leeward side, and the projections of the protrusions on the windward side in the axial direction do not overlap at all, and the projections of the protrusions on the leeward side in the axial direction do not overlap at all. This facilitates mold opening and manufacturing.

[0026] The fan wheel of the utility model can further include at least one connecting ring, and the connecting ring can connect the plurality of fan blades. In this way, the connecting ring can stabilize the positions of the plurality of fan blades, and can prevent the fan blades from shaking under high-speed operation, and has the effect of reducing the vibration or deformation of the fan blades caused by the influence of air resistance.

[0027] The connecting ring can be located between the root end of the blade and the tail end of the blade, so that the connecting ring can be ensured to have sufficient strength to stabilize each blade, thereby improving the rotation stability of the impeller.

[0028] In the axial direction, the projection of the connecting ring and the projection of each protrusion do not overlap at all, so that it is convenient for mold opening and manufacturing.

[0029] The fan frame further has an upper cover; at least one air inlet is arranged on the upper cover or the base; when the number of the air inlet is only one and is arranged on the upper cover or the base, the connecting ring is arranged at a position where each fan blade is away from the air inlet of the fan frame; or, when the upper cover and the base each have at least one air inlet, each air inlet has a corresponding air inlet cross-sectional area in the axial direction, the air inlet cross-sectional areas of all the air inlets arranged on the upper cover can be added to the total air inlet cross-sectional area corresponding to the upper cover, the air inlet cross-sectional areas of all the air inlets arranged on the base can be added to the total air inlet cross-sectional area corresponding to the base, and the connecting ring is arranged at a position where each fan blade is away from one of the upper cover and the base with a larger total air inlet cross-sectional area. In this way, the heat dissipation fan can easily guide the airflow from the main air inlet side into the fan frame, and can avoid interfering with the air inlet on the main air inlet side through the configuration of the connecting ring, which has the effect of making the airflow more circulated and increasing the air volume.

[0030] When there is only one air inlet and it is disposed on the upper cover, or when the upper cover has a larger total air inlet cross-sectional area than the base, the protrusions on the windward side are closer to the base than the protrusions on the leeward side. In this way, the impeller can maintain a better wind pressure and air volume when rotating, thereby improving the wind driving efficiency.

[0031] When there is only one air inlet and it is disposed on the base, or when the base has a larger total air inlet cross-sectional area than the upper cover, the protrusions on the windward side are closer to the upper cover than the protrusions on the leeward side. In this way, the impeller can maintain a better wind pressure and air volume when rotating, thereby improving the wind driving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 : An exploded perspective view of a preferred embodiment of the heat dissipation fan of the utility model;

[0033] Figure 2 :like Figure 1 A magnified view of the local structure shown in the middle A;

[0034] Figure 3 : A top view of the first embodiment of the fan wheel of the utility model;

[0035] Figure 4 : A partial top view of the first embodiment of the fan wheel of the utility model;

[0036] Figure 5 :along Figure 4 The perspective diagram of the BB line;

[0037] Figure 6 :according to Figure 5 , another aspect in which the protrusions are arranged at different positions;

[0038] Figure 7 : A top view of a connecting ring connecting a plurality of blades in the first embodiment of a fan wheel of the utility model;

[0039] Figure 8 : A partial stereoscopic view of the second embodiment of the fan wheel of the utility model;

[0040] Fig. 9 : A partial top view of the second embodiment of the fan wheel of the utility model;

[0041] Fig.10 :along Fig. 9 The CC line perspective diagram;

[0042] Fig.11 : A partial stereoscopic view of the third embodiment of the fan wheel of the utility model;

[0043] Fig.12 : A partial stereoscopic view of the fourth embodiment of the fan wheel of the utility model.

[0044] Description of reference numerals:

[0045] 1: Wheel hub

[0046] 11: Ring Wall

[0047] 111: Extension

[0048] 12:Plate body

[0049] 2: Fan blades

[0050] 2a: Leaf root end

[0051] 2b: Leaf end

[0052] 2c: Top edge

[0053] 2d: bottom edge

[0054] 3: Bump

[0055] 4: Connecting ring

[0056] 5: Fan frame

[0057] 51: Base

[0058] 511: Axle tube

[0059] 52: Upper cover

[0060] 6: Stator

[0061] D1: First minimum distance

[0062] D2: The second minimum distance

[0063] D3: The third smallest distance

[0064] D4: The fourth minimum distance

[0065] F: Runner

[0066] G: Gap

[0067] H: Height

[0068] L: Length

[0069] F1: Windward side

[0070] F2: Leeward side

[0071] K: Rotating shaft

[0072] P: Fan wheel

[0073] Q: Air inlet

[0074] R: Rotation direction

[0075] W: Width

[0076] X: Radial distance

[0077] Y: Axial distance. DETAILED DESCRIPTION

[0078] In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the preferred embodiments of the present invention are specifically cited below and described in detail with reference to the accompanying drawings; in addition, the same symbols in different drawings are regarded as the same and their descriptions are omitted.

[0079] Please refer to Figure 1 , Figure 2 As shown, it is the first embodiment of the fan wheel P of the utility model, including a hub 1, a plurality of fan blades 2 and a plurality of protrusions 3. The plurality of fan blades 2 are arranged around the hub 1, and the plurality of protrusions 3 are distributed on the plurality of fan blades 2.

[0080] Please refer to Figure 1 As shown, the central part of the hub 1 can be combined with a rotating shaft K. The present invention does not limit the material of the hub 1 and the structure and method of connecting the hub 1 to the rotating shaft K. For example, the hub 1 can be combined with the rotating shaft K by injection coating, or by tight fit or laser welding. In this embodiment, the hub 1 can be made of metal material and combined with the rotating shaft K by laser welding, so that the hub 1 and the rotating shaft K can be firmly combined. The hub 1 can have a ring wall 11 and a plate body 12. The rotating shaft K is connected to the plate body 12. The ring wall 11 is connected to the periphery of the plate body 12. The ring wall 11 can be used to combine the plurality of blades 2.

[0081] In this embodiment, the ring wall 11 may have an extension portion 111, and the extension portion 111 may be integrally formed and connected with the ring wall 11. The extension portion 111 is formed by the ring wall 11 extending radially outward (i.e., away from the rotation axis K). The extension portion 111 may be made of plastic or metal, and the present invention is not limited thereto. For example, the extension portion 111 may be made of plastic to cover the ring wall 11, so that the plurality of blades 2 can form a relatively large bonding area with the ring wall 11 of the hub 1 through the extension portion 111 under the premise of being thin, which has the effect of improving the bonding stability of the plurality of blades 2 and preventing them from breaking easily. In other embodiments, the plurality of blades 2 may also be directly connected to the ring wall 11 of the hub 1, and the present invention is not limited thereto.

[0082] The overall height of the several blades 2 preferably does not exceed the top surface of the hub 1 to reduce the overall axial height of the impeller P. The several blades 2 may respectively have a blade root end 2a and a blade tail end 2b opposite to each other, and each blade 2 is connected to the extension portion 111 of the ring wall 11 by the blade root end 2a. In addition, the several blades 2 may have a top edge 2c and a bottom edge 2d opposite to each other, and the bottom edge 2d may be farther away from the plate body 12 of the hub 1 than the top edge 2c. The spacing between the top edge 2c and the bottom edge 2d may be equidistant, or gradually expand from the blade root end 2a toward the blade tail end 2b, and the utility model is not limited thereto. In the present embodiment, the spacing between the top edge 2c and the bottom edge 2d gradually expands from the blade root end 2a toward the blade tail end 2b, so that the several blades 2 can generate a larger air volume.

[0083] Please refer to Figure 1 , Figure 2 As shown, each fan blade 2 has a windward surface F1 and a leeward surface F2, the windward surface F1 is defined as the side of the fan blades 2 facing a rotation direction R, and the leeward surface F2 is defined as the side of the fan blades 2 facing away from the rotation direction R, and a flow channel F can be formed between two adjacent fan blades 2, and each flow channel F passes through to the blade tail end 2b of the fan blade 2.

[0084] Please refer to Figure 2 , Figure 3 As shown, the plurality of protrusions 3 are located between the blade root end 2a and the blade tail end 2b, and the plurality of protrusions 3 are farther from the blade root end 2a and closer to the blade tail end 2b; in this embodiment, the plurality of protrusions 3 can be aligned with the blade tail ends 2b of the plurality of blades 2, so that the airflow can first flow through the plurality of protrusions 3 when flowing out from the blade tail ends 2b. In detail, the windward surface F1 and the leeward surface F2 of each blade 2 each have at least one protrusion 3, that is, the plurality of protrusions 3 can be located at the windward surface F1 and the leeward surface F2 at the same time. In this embodiment, the windward surface F1 and the leeward surface F2 are each provided with one protrusion 3 for illustration. The convex block 3 located on the windward surface F1 and the convex block 3 located on the leeward surface F2 are located at different axial heights; preferably, the convex block 3 located on the windward surface F1 is closer to the bottom edge 2d of each fan blade 2 than the convex block 3 located on the leeward surface F2, so that the fan wheel P can maintain a better wind pressure and wind volume when rotating, thereby improving the wind driving performance. However, in other embodiments (such as Figure 6 As shown in FIG. 1 ), the configuration of the protrusions 3 may also be that the protrusions 3 located on the leeward side F2 are closer to the bottom edge 2d of each blade 2 than the protrusions 3 located on the windward side F1. The shape of the protrusions 3 may be square, triangular or semicircular, etc. The protrusions 3 of this embodiment are illustrated as rectangular; and the thickness of the protrusions 3 may be greater than, equal to or less than the thickness of the blade 2, which is not limited by the present invention.

[0085] Please refer to Figure 4 , Figure 5 As shown, the projection 3 located on the windward surface F1 can have a first minimum distance D1 to the bottom edge 2d of the blade 2, and the projection 3 located on the leeward surface F2 can have a second minimum distance D2 to the top edge 2c of the blade 2, and the second minimum distance D2 can be equal to the first minimum distance D1, so that the fan wheel P can maintain better wind pressure and air volume when rotating. Preferably, each projection 3 can have a height H, and there can be an axial distance Y between two projections 3 located in the same flow channel F, and the axial distance Y can be less than or equal to the height H and greater than or equal to 0.75 times the height H; in this way, the airflow can easily flow through each projection 3, thereby allowing the airflow to flow smoothly. Furthermore, each protrusion 3 may have a width W, and a gap G may be provided between two protrusions 3 in the same flow channel F. The gap G may be greater than or equal to the width W and less than or equal to 2.5 times the width W, and there may be sufficient gap for air flow to pass through. In the present embodiment, the gap G is illustrated as being equal to the width W.

[0086] Similarly, in the configuration orientation of these bumps 3 Figure 5 In different situations, such as Figure 6In the state shown in which the protrusion 3 located on the leeward surface F2 is closer to the bottom edge 2d of each fan blade 2 than the protrusion 3 located on the windward surface F1, the protrusion 3 located on the windward surface F1 can have a third minimum distance D3 to the top edge 2c of the fan blade 2, and the protrusion 3 located on the leeward surface F2 can have a fourth minimum distance D4 to the bottom edge 2d of the fan blade 2. The fourth minimum distance D4 can be equal to the third minimum distance D3, so that the impeller P can maintain better wind pressure and air volume when rotating.

[0087] Please refer to Figure 7 As shown, it is particularly noted that the fan wheel P of the utility model can further include at least one connecting ring 4, the connecting ring 4 can connect the plurality of fan blades 2, the connecting ring 4 can be located between the blade root end 2a and the blade tail end 2b, and the connecting ring 4 can connect the top edge 2c or the bottom edge 2d of the plurality of fan blades 2 (such as Figure 2 As shown), or, you can also choose to connect any position between the top edge 2c and the bottom edge 2d. In this embodiment, the connecting ring 4 can be connected to the bottom edge 2d. The connecting ring 4 can stabilize the positions of the several fan blades 2 to avoid the shaking of each fan blade 2 under high-speed operation, and can reduce the vibration or deformation of each fan blade 2 caused by the air resistance during the rotation of the fan wheel P.

[0088] It is also noted that the utility model does not limit the material of the several blades 2. The several blades 2 and the ring wall 11 can be the same material or different materials, and the several blades 2 and the hub 1 can be connected by snapping, pasting, welding, interlocking or integral molding, etc., and the utility model is not limited. For example, when the extension 111 and the several blades 2 are made of the same material, they can be connected as a whole by injection molding to improve structural strength and production efficiency. In this embodiment, the extension 111, the several blades 2 and the connecting ring 4 can be combined with the hub 1 by injection molding such as a polymer material, and the above-mentioned polymer can preferably be a combination of liquid crystal polymer and carbon fiber, a combination of liquid crystal polymer and mineral fiber, or a combination of liquid crystal polymer, glass fiber and mineral fiber; or, it can also be made of metal powders such as iron, aluminum, copper or metal alloys mixed in a polymer binder and injected into an integral molding to improve its structural strength.

[0089] In addition, the thickness of each blade 2 can be less than or equal to 0.3 mm, preferably 0.2 mm, to maintain the overall thinness of the fan, while avoiding the weight of the entire impeller P being too heavy, thereby improving the operating efficiency. In addition, the number of blades 2 can be 50 to 150; wherein the number of blades 2 is preferably 80 to 100 or more preferably 90, so that the thinned blades 2 can generate sufficient air volume and the blades 2 can be accommodated on the periphery of the hub 1. It should be noted that the number of blades 2 can be adjusted in units of one blade within the above-mentioned range (50 to 150).

[0090] Please refer to Figure 8 , Fig. 9 , Fig.10 As shown, it is the second embodiment of the impeller P of the utility model. The second embodiment of the utility model is substantially the same as the first embodiment described above. In the second embodiment, the plurality of protrusions 3 are not aligned with the blade tail ends 2b of the plurality of blades 2. In detail, each protrusion 3 may have a length L, and each protrusion 3 may have a radial distance X from the blade tail end 2b of the blade 2. The radial distance X may be less than or equal to 0.5 times of the length L and greater than 0, which can ensure that the airflow first flows through the plurality of protrusions 3 and then flows out from the blade tail end 2b. In addition, the gap G between the two protrusions 3 located in the same flow channel F may be greater than or equal to the width W of the protrusion 3 and less than or equal to 2.5 times of the width W, so that there may be enough gap for the airflow to pass through; in the present embodiment, the gap G is illustrated as being equal to twice the width W of the protrusion 3. In addition, if there are more than two protrusions 3 on the windward surface F1 and more than two protrusions 3 on the leeward surface F2, the radial distance X is measured from the protrusion 3 closest to the blade tail end 2b to the blade tail end 2b.

[0091] Please refer to Fig.11 As shown, it is the third embodiment of the impeller P of the utility model. The third embodiment of the utility model is substantially the same as the first embodiment described above. In the third embodiment, the protrusion 3 located on the windward surface F1 and the protrusion 3 located on the leeward surface F2 can be two or more respectively. The protrusion 3 located on the windward surface F1 and the protrusion 3 located on the leeward surface F2 are asymmetrically arranged on both sides of the fan blade 2. The projection of the protrusion 3 located on the windward surface F1 in the axial direction can be completely or partially overlapped, and the projection of the protrusion 3 located on the leeward surface F2 in the axial direction can be completely or partially overlapped. When the impeller P rotates, the airflow flowing into the space between two adjacent fan blades 2 can flow through each protrusion 3 and form a diversion, thereby avoiding the formation of turbulence or wind shear, and reducing the noise caused by excessive airflow.

[0092] Please refer to Fig.12As shown, it is the fourth embodiment of the fan wheel P of the utility model. The fourth embodiment of the utility model is substantially the same as the first embodiment described above. In the fourth embodiment, the number of the protrusion 3 located on the windward surface F1 and the number of the protrusion 3 located on the leeward surface F2 can be two or more respectively. The protrusion 3 located on the windward surface F1 and the protrusion 3 located on the leeward surface F2 are asymmetrically arranged on both sides of the fan blade 2. The projections of the protrusions 3 located on the windward surface F1 in the axial direction do not overlap at all, and the projections of the protrusions 3 located on the leeward surface F2 in the axial direction do not overlap at all, so that the protrusions 3 located on the windward surface F1 and the protrusions 3 located on the leeward surface F2 are staggered in the axial direction (especially completely staggered). In this way, it can further facilitate mold opening and manufacturing.

[0093] Please refer to Figure 1 , Figure 2 As shown, in a cooling fan having a fan wheel P of any of the above-mentioned embodiments, the cooling fan has a fan frame 5, the fan frame 5 has a base 51 and an upper cover 52, the base 51 has a shaft tube 511; the fan wheel P can be arranged between the base 51 and the upper cover 52, and can be rotatably arranged on the shaft tube 511; the fan frame 5 also has a stator 6 arranged on the outer periphery of the shaft tube 511. Since the windward surface F1 and the leeward surface F2 of each fan blade 2 respectively have at least one of the protrusions 3, the airflow flowing into the two adjacent fan blades 2 can flow through each protrusion 3 to form a split flow, which can reduce the formation of turbulence or the generation of wind shear, thereby increasing the air volume and ensuring that the airflow swirled out by the several fan blades 2 is less obstructed, and the noise caused by excessive airflow can be reduced. In addition, even if the motor is at a low speed, the several fan blades 2 can generate effective airflow to maintain a predetermined air volume, which can also have the effect of saving energy.

[0094] Optionally, the fan frame 5 has at least one air inlet Q which can be arranged on the upper cover 52 and / or the base 51. In one embodiment, when there is only one air inlet Q, the connecting ring 4 can be arranged at a position of each fan blade 2 away from the air inlet Q of the fan frame 5. For example, when the only air inlet Q is located on the upper cover 52, the connecting ring 4 is located at the bottom edge 2d of the fan blade 2, or is axially arranged between a midpoint of each fan blade 2 and the bottom edge 2d (farther away from the air inlet Q); when the only air inlet Q is located on the base 51, the connecting ring 4 is located at the top edge 2c of each fan blade 2, or is axially arranged between a midpoint position of each fan blade 2 and the top edge 2c (farther away from the air inlet Q); wherein the midpoint is at a position equidistant from the top edge 2c and the bottom edge 2d in the axial direction. In another embodiment, when the upper cover 52 and the base 51 each have at least one air inlet Q, each air inlet Q has a corresponding air inlet cross-sectional area in the axial direction, the air inlet cross-sectional areas of all the air inlets Q on the upper cover 52 can be added up to the total air inlet cross-sectional area corresponding to the upper cover 52, and the air inlet cross-sectional areas of all the air inlets Q on the base 51 can be added up to the total air inlet cross-sectional area corresponding to the base 51, and the connecting ring 4 is arranged at a position where each fan blade 2 is away from the one of the upper cover 52 and the base 51 having a larger total air inlet cross-sectional area. In this way, the heat dissipation fan can easily guide the airflow into the fan frame 5 from the main air inlet side (the side having a single air inlet Q or a larger total air inlet cross-sectional area), and the configuration of the connecting ring 4 can avoid interfering with the air inlet on the main air inlet side, which can have the effect of making the airflow more circulated and increasing the air volume. In this embodiment, the upper cover 52 has a larger total air inlet cross-sectional area for illustration, and the connecting ring 4 is correspondingly arranged at the air inlet Q away from the upper cover 52, that is, the connecting ring 4 can be as follows Figure 7 The bottom edge 2d is shown connected.

[0095] In particular, based on the configuration of the above features, when the main wind inlet side is located at the upper cover 52, it is preferred that the protrusions 3 located at the windward side F1 are further away from the main wind inlet side than the protrusions 3 located at the leeward side F2; that is, the protrusions 3 located at the windward side F1 are closer to the base 51 (correspondingly closer to the bottom edge 2d, similar to the protrusions 3 located at the leeward side F2). Figure 5 Similarly, when the main wind inlet side is located at the base 51, it is also preferred that the protrusions 3 located at the windward side F1 are further away from the main wind inlet side than the protrusions 3 located at the leeward side F2, that is, the protrusions 3 located at the windward side F1 are closer to the upper cover 52 (correspondingly closer to the top edge 2c, similar to the protrusions 3 located at the leeward side F2). Figure 6 configuration), so that the fan wheel P can maintain better wind pressure and air volume when rotating.

[0096] In summary, the fan wheel of the utility model and the cooling fan having the fan wheel, since the windward side and the leeward side of each fan blade respectively have at least one protrusion, the airflow flowing into two adjacent fan blades can flow through each protrusion to form a diversion, which can reduce the formation of turbulence or wind shear, thereby increasing the air volume and ensuring that the airflow rotated out by the several fan blades is less obstructed, which can reduce the noise caused by excessive airflow, and can simultaneously have the effect of increasing the air volume and reducing the fan operation noise.

[0097] Although the utility model has been disclosed using the above preferred embodiments, it is not intended to limit the utility model. Any person skilled in the art can make various changes and modifications to the above embodiments without departing from the spirit and scope of the utility model, which still fall within the technical scope protected by the utility model. Therefore, the protection scope of the utility model shall include all changes within the meaning and equivalent scope of the claims attached above. In addition, when the above several embodiments can be combined, the utility model includes any combination of implementations.

Claims

1. A fan wheel, characterized in that: include: a wheel hub; A plurality of blades are arranged around the hub, each blade having a blade root end and a blade tail end opposite to each other, each blade root end is connected to the hub, and each blade has a windward side and a leeward side; and A plurality of protrusions are distributed on the plurality of fan blades, and the plurality of protrusions are located between the blade root end and the blade tail end. The plurality of protrusions are farther away from the blade root end and closer to the blade tail end. The windward side and the leeward side of each fan blade respectively have at least one such protrusion, and the protrusion located on the windward side and the protrusion located on the leeward side are located at different axial heights.

2. The impeller according to claim 1, characterized in that: Each fan blade has a top edge and a bottom edge opposite to each other, and the convex block located on the windward side is closer to the bottom edge of each fan blade than the convex block located on the leeward side.

3. The impeller according to claim 1, characterized in that: Each fan blade has a top edge and a bottom edge opposite to each other, and the convex block located on the leeward side is closer to the bottom edge of each fan blade than the convex block located on the windward side.

4. The impeller according to claim 1, characterized in that: A flow channel is formed between two adjacent fan blades, and each flow channel runs through to the tail end of the fan blade.

5. The impeller according to claim 2, characterized in that: There is a first minimum distance between the protrusion located on the windward side and the bottom edge of the fan blade, and there is a second minimum distance between the protrusion located on the leeward side and the top edge of the fan blade, and the second minimum distance is equal to the first minimum distance.

6. The impeller according to claim 3, characterized in that: There is a third minimum distance between the protrusion located on the windward side and the top edge of the fan blade, and there is a fourth minimum distance between the protrusion located on the leeward side and the bottom edge of the fan blade, and the fourth minimum distance is equal to the third minimum distance.

7. The impeller according to claim 1, characterized in that: Each protrusion has a height, a flow channel is formed between two adjacent blades, and an axial distance is provided between two protrusions in the same flow channel, and the axial distance is less than or equal to the height and greater than or equal to 0.75 times of the height.

8. The impeller according to claim 1, characterized in that: The number of the fan blades is 50 to 150.

9. The impeller according to claim 1, characterized in that: Each protrusion has a length, and each protrusion has a radial distance to the blade tail end of the fan blade, and the radial distance is less than or equal to 0.5 times of the length and greater than or equal to 0.

10. The impeller according to claim 1, characterized in that: Each protrusion has a width, a flow channel is formed between two adjacent blades, and a gap is provided between two protrusions in the same flow channel, the gap being greater than or equal to the width and less than or equal to 2.5 times of the width.

11. The impeller according to claim 1, characterized in that: The thickness of each fan blade is less than or equal to 0.3 mm.

12. The impeller according to claim 1, characterized in that: There are two protrusions on the windward side and two protrusions on the leeward side respectively. The projections of the protrusions on the windward side in the axial direction completely or partially overlap each other, and the projections of the protrusions on the leeward side in the axial direction completely or partially overlap each other.

13. The impeller according to claim 1, characterized in that: There are two protrusions on the windward side and two protrusions on the leeward side respectively. The projections of the protrusions on the windward side in the axial direction do not overlap at all, and the projections of the protrusions on the leeward side in the axial direction do not overlap at all.

14. The impeller according to any one of claims 1 to 13, characterized in that: In addition, it includes at least one connecting ring, which connects a plurality of the fan blades.

15. The impeller according to claim 14, characterized in that: The connecting ring is located between the blade root end and the blade tail end.

16. The impeller according to claim 14, characterized in that: In the axial direction, the projection of the connecting ring and the projection of each protrusion do not overlap at all.

17. A cooling fan, characterized in that: include: A sash frame has a base having an axle tube; a stator located at the outer periphery of the shaft tube; and The impeller as claimed in any one of claims 1 to 16, wherein the impeller is rotatably disposed on the shaft tube.

18. A cooling fan, characterized in that: include: A sash frame comprises a base and an upper cover, wherein the base comprises an axle tube; a stator located at the outer periphery of the shaft tube; At least one air inlet is disposed on the upper cover or the base; and The impeller according to any one of claims 14 to 16, wherein the impeller is rotatably mounted on the shaft tube; Wherein, when the number of the air inlet is only one and is disposed on the upper cover or the base, the connecting ring is disposed at a position of each fan blade away from the air inlet of the fan frame; Alternatively, when the upper cover and the base respectively have at least one air inlet, each air inlet has a corresponding air inlet cross-sectional area in the axial direction, the sum of the air inlet cross-sectional areas of all the air inlets arranged on the upper cover is the total air inlet cross-sectional area corresponding to the upper cover, the sum of the air inlet cross-sectional areas of all the air inlets arranged on the base is the total air inlet cross-sectional area corresponding to the base, and the connecting ring is arranged at a position where each fan blade is away from one of the upper cover and the base having a larger total air inlet cross-sectional area.

19. The heat dissipation fan according to claim 18, characterized in that: When there is only one air inlet and it is disposed on the upper cover, or the upper cover has a larger total air inlet cross-sectional area than the base, the protrusions on the windward side are closer to the base than the protrusions on the leeward side.

20. The heat dissipation fan according to claim 18, wherein: When there is only one air inlet and it is disposed on the base, or the base has a larger total air inlet cross-sectional area than the upper cover, the protrusions on the windward side are closer to the upper cover than the protrusions on the leeward side.

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