Cooling fan

Abstract

A cooling fan is used for solving the problem that noise is too large when an existing cooling fan operates. Comprising a fan frame, the fan frame is provided with a base, a side wall and a cover plate, the side wall is connected with the base, the cover plate is connected with the side wall, the cover plate is opposite to the base, the fan frame is provided with an air inlet, and the base, the side wall and the cover plate jointly form an air outlet; the fan wheel is rotatably positioned in the fan frame, and the fan frame is provided with an air duct; and the at least one convex body is positioned in the air duct between the fan wheel and the side wall, the at least one convex body has a first axial height, the fan wheel has a second axial height, the first axial height is greater than or equal to 1 / 10 of the second axial height, and the first axial height is less than or equal to 1 / 4 of the second axial height. Therefore, the effect of reducing the noise generated by the airflow during the operation of the fan can be achieved.

Description

Technical Field

[0001] This utility model relates to a wind-driving device, and more particularly to a cooling fan used to assist in the heat dissipation of electronic devices. Background Technology

[0002] Existing cooling fans can be connected to a hub via a rotating shaft, with each of the fan's blades connected at one end to the outer wall of the hub. Thus, a cooling fan with this existing fan wheel can be assembled and positioned in systems such as laptops, air conditioners, or ventilation equipment to generate airflow through the fan blades. While these existing cooling fans can drive airflow, the large airflow generated by the rotating fan blades easily creates turbulence, leading to effects such as wind noise, resulting in excessive noise during operation.

[0003] Therefore, existing cooling fans do indeed need to be improved. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this invention is to provide a cooling fan that can reduce noise during operation.

[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 "combination," "integration," or "assembly" used throughout this utility model mainly include forms such as those where the components can be separated without damaging them after connection, or those where the components cannot be separated 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.

[0008] The present invention discloses a cooling fan comprising: a fan frame having a base, a side wall connected to the base, a cover plate connected to the side wall, the cover plate being opposite to the base, the fan frame having at least one air inlet, and the base, the side wall, and the cover plate forming an air outlet; a fan wheel rotatably located within the fan frame, the fan frame having an air duct; and at least one protrusion located between the fan wheel and the side wall in the air duct, the at least one protrusion having a first axial height, the fan wheel having a second axial height, the first axial height being greater than or equal to 1 / 10 of the second axial height, and the first axial height being less than or equal to 1 / 4 of the second axial height.

[0009] Therefore, the cooling fan of this utility model, with at least one protrusion located in the air duct, when the airflow enters the fourth zone (strong wind zone) near the air outlet as the fan wheel rotates, the airflow can pass through the at least one protrusion, and the at least one protrusion can divide the airflow, thereby breaking the concentration of the airflow in the air duct, so as to make the airflow uniform and smooth, thereby reducing the noise generated by the airflow when the fan is operating.

[0010] The fan frame has a first reference plane and a second reference plane. The first reference plane passes through the axis of the fan wheel and is radially parallel to the end edge of the air outlet. The second reference plane is orthogonal to the first reference plane. Based on the rotation direction of the fan wheel, the first and second reference planes sequentially define the air duct as a first zone, a second zone, a third zone, and a fourth zone. The minimum radial distance between the fan wheel and the sidewall is located in the first zone, and the at least one protrusion is located in the fourth zone. Thus, the at least one protrusion can disrupt the concentration of airflow in the strong wind zone of the fourth zone.

[0011] The at least one protrusion is located in the range of 1.2 to 1.8 times the diameter of the fan. In this way, the at least one protrusion can be reliably located in the path of the airflow, which has the effect of disrupting the concentration of the airflow.

[0012] The at least one protrusion is located on the base or on the cover plate. Thus, the at least one protrusion located in the air duct can disrupt the concentration of airflow in the air duct.

[0013] The base and the cover plate have an axial distance, and the first axial height of the at least one protrusion does not exceed 20% of the axial distance. In this way, the at least one protrusion can have an appropriate first axial height, which can prevent the at least one protrusion from excessively obstructing the air duct in the axial direction and affecting the air outlet's air output efficiency.

[0014] One end of the at least one protrusion has a guide arc edge. In this way, the guide arc edge can make the airflow flow smoothly, thereby reducing noise.

[0015] The maximum radial dimension of the at least one protrusion is 1 / 15 to 1 / 10 of the diameter of the fan wheel. This avoids the at least one protrusion from excessively obstructing the air duct in the radial direction, thus affecting the efficiency of the air outlet.

[0016] The number of the at least one protrusion is several, and these protrusions are located on the base or on the cover plate. In this way, the several protrusions can be located in the air duct to disrupt the concentration of airflow in the air duct.

[0017] In this configuration, the geometric centers of at least two protrusions are at different distances from the axis of the fan wheel. This allows the at least two protrusions to be radially misaligned, thereby disrupting the concentration of airflow within the duct.

[0018] In this configuration, the geometric centers of at least two protrusions are equidistant from the axis of the fan wheel. This arrangement allows the protrusions to be positioned in a concentric circle, thereby disrupting the concentration of airflow within the duct.

[0019] The geometric center of each protrusion and the axis of the fan wheel pass through a reference line, and the angle θ between the reference lines of any two adjacent protrusions is 5 to 30°. In this way, the protrusions are spaced appropriately to allow airflow and to avoid the protrusions excessively obstructing the effectiveness of the air duct.

[0020] In this configuration, the included angle between the baselines of any two adjacent protrusions is the same. This ensures that there is an appropriate spacing between the protrusions to allow airflow and prevents the protrusions from excessively obstructing the airflow channel. Attached Figure Description

[0021] Figure 1 : An exploded perspective view of the first embodiment of this utility model;

[0022] Figure 2 Side view of the first embodiment of this utility model;

[0023] Figure 3 :along Figure 2 AA-line cross-section;

[0024] Figure 4 : An exploded perspective view of the second embodiment of this utility model;

[0025] Figure 5 The two protrusions in the second embodiment of this utility model are located in the cover plate diagram;

[0026] Figure 6 : A diagram showing the radial misalignment of the two convex bodies according to the second embodiment of this utility model;

[0027] Figure 7The two convex bodies of the second embodiment of this utility model are arranged in a concentric circle.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1: Sector frame

[0030] 11: Base

[0031] 12: Side wall

[0032] 13: Cover plate

[0033] 14: Air Inlet

[0034] 15: Air vent

[0035] 2: Fan wheel

[0036] 21: Wheel hub

[0037] 22: Leaf

[0038] 23: Shaft

[0039] 3: convex body

[0040] 3a: End

[0041] 31: Guide arc edge

[0042] F: Cooling fan

[0043] D: Rotation direction

[0044] R: Air duct

[0045] R1: Zone 1

[0046] R2: Second District

[0047] R3: Third District

[0048] R4: Fourth District

[0049] S1: First reference plane

[0050] S2: Second reference plane

[0051] O: Axis

[0052] T1: First circumference

[0053] T2: Second circumference

[0054] H1: First axial height

[0055] H2: Second axial height

[0056] H3: Axial distance

[0057] W: Maximum radial dimension

[0058] L: Baseline

[0059] θ: included angle. Detailed Implementation

[0060] 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 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.

[0061] Please refer to Figure 1 , Figure 2 As shown, it is the first embodiment of the cooling fan F of this utility model, including a fan frame 1, a fan wheel 2, and at least one protrusion 3. The fan wheel 2 is rotatably disposed in the fan frame 1, and the at least one protrusion 3 is located in the fan frame 1.

[0062] The fan frame 1 has a base 11 and a side wall 12, the side wall 12 being connected to the base 11. For example, the side wall 12 can be integrally formed with the base 11. The fan frame 1 also has a cover plate 13, the cover plate 13 being connected to the side wall 12. The cover plate 13 can be integrally formed with the side wall 12 and can be opposite to the base 11. The fan frame 1 has at least one air inlet 14, which can be for axial air intake. For example, the at least one air inlet 14 can be located on the cover plate 13, and / or the at least one air inlet 14 can be located on the base 11. This invention is not limited to this. The base 11, the side wall 12, and the cover plate 13 together form an air outlet 15.

[0063] Please refer to Figure 2 , Figure 3 As shown, the fan wheel 2 may have a hub 21 and several blades 22, which are arranged around the hub 21. The fan wheel 2 may have a rotating shaft 23, which is coupled and positioned to the hub 21. An air duct R may be provided within the fan frame 1 along a rotation direction D of the fan wheel 2. More specifically, the air duct R may be located between the fan wheel 2 and the side wall 12, and the air duct R connects the at least one air inlet 14 and the air outlet 15. Thus, the fan wheel 2 can rotate to guide airflow from the at least one air inlet 14 into the air duct R of the fan frame 1, and then guide the airflow out from the air outlet 15. Furthermore, when the at least one air inlet 14 is located on the base 11, there may be, for example, several air inlets 14, arranged around the connection between the rotating shaft 23 and the base 11, as will be understood by those skilled in the art, and will not be elaborated upon here.

[0064] Please continue reading. Figure 3As shown, the fan frame 1 has a virtual first reference plane S1, which passes through an axis O of the fan wheel 2 and is radially parallel to the air outlet 15. The fan frame 1 also has a virtual second reference plane S2, which is orthogonal to the first reference plane S1 and is perpendicular to the rotation direction D of the fan wheel 2. Figure 3 Taking a counter-clockwise direction as an example, the first reference plane S1 and the second reference plane S2 can sequentially define the air duct R, specifically the air duct R located between the fan wheel 2 and the side wall 12, as a first zone R1, a second zone R2, a third zone R3, and a fourth zone R4. The minimum radial distance between the fan wheel 2 and the side wall 12 can be located in the first zone R1. Therefore, the first zone R1 can form a pressurization zone, in which a relatively narrow gap is formed between the fan wheel 2 and the inner wall of the side wall 12, so that the airflow entering through the at least one air inlet 14 can be compressed as the fan wheel 2 rotates. Furthermore, the air duct R can radially expand from the first zone R1 toward the fourth zone R4 in the rotation direction D, and a high pressure to low pressure can be formed from the first zone R1 to the fourth zone R4. Thus, a pressure difference can be generated through the radially expanding air duct R, allowing airflow to be continuously introduced through the at least one air inlet 14 and discharged from the air outlet 15.

[0065] The at least one protrusion 3 can be located in the air duct R, that is, the at least one protrusion 3 can be located between the fan wheel 2 and the side wall 12. The at least one protrusion 3 can disrupt the concentration of airflow in the air duct R, so as to make the airflow uniform and smooth, thereby reducing noise. Preferably, the at least one protrusion 3 can be located in the fourth zone R4 of the air duct R. The fourth zone R4 is a strong wind zone adjacent to the air outlet 15. Therefore, the at least one protrusion 3 can disrupt the concentration of airflow at the air outlet 15. Furthermore, the at least one protrusion 3 can be located in the range of 1.2 to 1.8 times the diameter of the fan 2. That is, 1.2 times the diameter of the fan 2 can have a virtual first circumference T1, and 1.8 times the diameter of the fan 2 can have a virtual second circumference T2. The periphery of the at least one protrusion 3 does not exceed the area between the first circumference T1 and the second circumference T2, so that the at least one protrusion 3 can be reliably located in the path through which the airflow passes, thereby disrupting the concentration of airflow. For example, the at least one protrusion 3 may be located on the base 11, or the at least one protrusion 3 may be located on the cover plate 13, so that the at least one protrusion 3 may be located on the air duct R. Alternatively, the at least one protrusion 3 may be attached to the base 11 or the cover plate 13. Alternatively, the at least one protrusion 3 may protrude from the outer surface of the base 11 toward the air duct R. Alternatively, the at least one protrusion 3 may protrude from the outer surface of the cover plate 13 toward the air duct R. This utility model does not limit the scope of the invention.

[0066] Please continue reading. Figure 2As shown in detail, the at least one protrusion 3 has a first axial height H1, and the fan wheel 2 has a second axial height H2. The first axial height H1 of the at least one protrusion 3 can be greater than or equal to 1 / 10 of the second axial height H2, and the first axial height H1 of the at least one protrusion 3 can be less than or equal to 1 / 4 of the second axial height H2. Furthermore, there is an axial distance H3 between the base 11 and the cover plate 13, and the first axial height H1 of the at least one protrusion 3 can not exceed 20% of the axial distance H3. Thus, the at least one protrusion 3 can have an appropriate first axial height H1, so that there is an appropriate gap between the at least one protrusion 3 and the cover plate 13, or between the at least one protrusion 3 and the base 11, which can prevent the at least one protrusion 3 from excessively obstructing the air duct R axially, thereby affecting the air outlet 15.

[0067] More specifically, the at least one protrusion 3 can be a cylindrical or rectangular prism, or other similar geometric shapes. Preferably, one end 3a of the at least one protrusion 3 can have a curved edge 31, which allows the airflow to flow smoothly, thus reducing noise. The maximum radial dimension W of the at least one protrusion 3 can be 1 / 15 to 1 / 10 of the diameter of the fan wheel 2. This avoids the at least one protrusion 3 excessively obstructing the air duct R radially, thereby affecting the airflow from the outlet 15. Therefore, this invention uses the at least one protrusion 3 to disrupt the concentration of airflow at the outlet 15, thereby achieving the effect of reducing noise.

[0068] Please refer to Figure 4 , Figure 5 As shown, this is the second embodiment of the cooling fan F of this utility model. This embodiment is largely the same as the first embodiment described above. In this embodiment, the number of at least one protrusion 3 is several, so as to further disrupt the concentration of airflow through the several protrusions 3. The several protrusions 3 are located in the fourth zone R4 of the air duct R. The several protrusions 3 can all be located on the base 11 or all on the cover plate 13, or the several protrusions 3 can be partially located on the base 11 and partially located on the cover plate 13. The several protrusions 3 can be cylinders or rectangular cylinders, etc., and the shapes of the several protrusions 3 can be the same or different, which is not limited by this utility model.

[0069] Please refer to Figure 6 , Figure 7 As shown, taking at least two protrusions 3 as an example, the distances between the geometric centers of the at least two protrusions 3 and the axis O of the fan wheel 2 can be different, so that the at least two protrusions 3 can be arranged in a staggered manner in the radial direction (e.g. Figure 6 (As shown), or, the distance between the geometric center of each protrusion 3 and the axis O of the fan wheel 2 can be the same, so that each protrusion 3 is arranged in a concentric circle (as shown). Figure 7(As shown). Furthermore, the geometric center of each protrusion 3 and the axis O of the fan wheel 2 can be connected by a virtual reference line L. An angle θ can be formed between the reference lines L of any two adjacent protrusions 3, and this angle θ can be 5–30°. Preferably, the angle θ between the reference lines L of any two adjacent protrusions 3 can be the same. This allows for an appropriate spacing between the protrusions 3 to allow airflow, preventing the protrusions 3 from excessively obstructing the air duct R.

[0070] In summary, the cooling fan of this utility model, with at least one protrusion located in the air duct, allows airflow to pass through the at least one protrusion when the airflow enters the fourth zone (strong wind zone) near the air inlet and outlet as the fan wheel rotates. The at least one protrusion divides the airflow, thereby disrupting the concentration of airflow in the air duct and making the airflow uniform and smooth. This reduces the noise generated by the airflow when the fan is operating.

[0071] 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 cooling fan, characterized in that, include: A fan frame has a base, a side wall connected to the base, and a cover plate connected to the side wall, the cover plate being opposite to the base. The fan frame has at least one air inlet, and the base, the side wall, and the cover plate together form an air outlet. A fan wheel, rotatably located within the fan frame, the fan frame having an air duct; and At least one protrusion is located in the air duct between the fan wheel and the side wall. The at least one protrusion has a first axial height, and the fan wheel has a second axial height. The first axial height is greater than or equal to 1 / 10 of the second axial height, and the first axial height is less than or equal to 1 / 4 of the second axial height.

2. The cooling fan as described in claim 1, characterized in that, The fan frame has a first reference surface and a second reference surface. The first reference surface passes through an axis of the fan wheel and is radially parallel to the end edge of the air outlet. The second reference surface is orthogonal to the first reference surface. According to the rotation direction of the fan wheel, the first reference surface and the second reference surface sequentially define the air duct between the fan wheel and the side wall as a first zone, a second zone, a third zone, and a fourth zone. The minimum radial distance between the fan wheel and the side wall is located in the first zone, and the at least one protrusion is located in the fourth zone.

3. The cooling fan as described in claim 1, characterized in that, The at least one protrusion is located in the range of 1.2 to 1.8 times the diameter of the fan.

4. The cooling fan as described in claim 1, characterized in that, The at least one protrusion is located on the base, or the at least one protrusion is located on the cover plate.

5. The cooling fan as described in claim 1, characterized in that, There is an axial distance between the base and the cover plate, and the first axial height of the at least one protrusion does not exceed 20% of the axial distance.

6. The cooling fan as described in claim 1, characterized in that, At least one of the protrusions has a guide arc edge at one end.

7. The cooling fan as described in claim 1, characterized in that, The maximum radial dimension of the at least one protrusion is 1 / 15 to 1 / 10 of the diameter of the fan wheel.

8. The cooling fan as described in claim 1, characterized in that, The number of the at least one protrusion is several, and several of the protrusions are located on the base or on the cover plate.

9. The cooling fan as described in claim 8, characterized in that, The geometric centers of at least two convex bodies are at different distances from the axis of the fan wheel.

10. The cooling fan as described in claim 8, characterized in that, The geometric centers of at least two convex bodies are equidistant from the axis of the fan wheel.

11. The cooling fan as described in claim 8, characterized in that, The geometric center of each convex body and the axis of the fan wheel pass through a reference line, and the angle between the reference lines of any two adjacent convex bodies is 5 to 30°.

12. The cooling fan as described in claim 11, characterized in that, The included angle between the reference lines of any two adjacent convex bodies in the plurality of such convex bodies is the same.

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