Cooling fan

Abstract

A cooling fan is used for solving the problem that an existing cooling fan is insufficient in air inlet amount. Comprising a fan frame, the fan frame is provided with a base, a side wall connected with the base and a cover plate connected with the side wall, the cover plate is opposite to the base, the cover plate 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; the at least one pressurizing body is adjacent to the air duct, and the at least one pressurizing body is provided with a flow guide surface; the air flow channel is located in the fan frame, the air flow channel axially faces the at least one pressurizing body, the air flow channel radially extends to the flow guide face to be communicated with the air channel, and the air flow channel radially extends towards the side wall to be connected with the side wall. Therefore, the heat dissipation efficiency of the heat dissipation fan can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a wind device, in particular, a cooling fan for assisting electronic devices to dissipate heat. BACKGROUND

[0002] Please refer to Figure 1 , which is a conventional cooling fan 9 having a housing 91 with an axial inlet 92 and a radial outlet 93. A fan wheel 94 is rotatably located in the housing 91. When the fan wheel 94 rotates, it can drive the airflow to flow into the housing 91 axially from the axial inlet 92 and flow out from the radial outlet 93. The airflow passage of the cooling fan 9 has a plenum 95, in which the fan wheel 94 and the inner wall of the housing 91 form a relatively narrow gap, so that the airflow entering from the axial inlet 92 can be compressed with the rotation of the fan wheel 94.

[0003] Generally, a protrusion 96 is provided at the beginning of the plenum 95, which protrudes from the inner wall of the housing 91 towards the fan wheel 94. In this way, the protrusion 96 can form a narrow gap with the fan wheel 94, so that the airflow can be compressed by the protrusion 96. However, the narrow gap between the protrusion 96 and the fan wheel 94 causes the air intake to decrease at the position of the protrusion 96 of the axial inlet 92, resulting in insufficient air intake.

[0004] Therefore, the conventional cooling fan still needs to be improved. SUMMARY

[0005] To solve the above problems, the purpose of the present application is to provide a cooling fan that can improve the axial air intake.

[0006] The directional or approximate terms used throughout the present application, such as "front", "back", "left", "right", "up (top)", "down (bottom)", "inside", "outside", "side", etc., mainly refer to the direction of the attached drawings. Each directional or approximate term is only used to assist in the description and understanding of the embodiments of the present application, and is not intended to limit the present application.

[0007] The use of the quantifier "one" or "a" for the elements and components described throughout the present application is only for the convenience of use and to provide the general meaning of the scope of the present application; in the present application, it should be interpreted as including one or at least one, and the single concept also includes multiple cases, unless it is obviously intended to mean otherwise.

[0008] The terms "combine", "combine" or "assemble" and the like in the present invention mainly include the state that the components can be separated without damaging the components after being connected, or the state that the components cannot be separated after being connected, and the skilled in the art can select according to the material of the components to be connected or the assembly requirements.

[0009] The heat dissipation fan of the present invention comprises: a fan frame having a base, a side wall connected to the base, a cover plate connected to the side wall, the cover plate opposite to the base, the cover plate having an air inlet, the base, the side wall and the cover plate collectively forming an air outlet; a fan wheel rotatably located in the fan frame, the fan frame having an air duct; at least one booster body adjacent to the air duct, the at least one booster body having a flow guide surface, the flow guide surface facing the fan wheel; and an airflow groove located in the fan frame, the airflow groove axially aligned with the at least one booster body, the airflow groove radially extending to the flow guide surface to communicate with the air duct, and the airflow groove radially extending towards the side wall to connect the side wall.

[0010] Therefore, the heat dissipation fan of the present invention, by axially aligning the airflow groove with the at least one booster body, the airflow groove radially extending to the flow guide surface to communicate with the air duct, so that the airflow introduced from the air inlet not only enters the air duct, but also further accommodates more incoming airflow through the airflow groove, thereby allowing more airflow to enter from the air inlet, thereby improving the air intake of the air inlet and improving the heat dissipation efficiency of the heat dissipation fan.

[0011] The fan frame has a reference surface passing through a geometric center of the air inlet, the reference surface being radially orthogonal to the air outlet, the reference surface sequentially dividing the air duct into a high-pressure zone and a strong wind zone according to the rotation direction, and the booster body being located in the high-pressure zone. In this way, the air duct can form a high pressure to a low pressure from the high-pressure zone to the strong wind zone, so that the airflow can be continuously introduced from the air inlet and discharged from the air outlet.

[0012] The at least one booster body is adjacent to the air outlet. In this way, the air duct is formed at the starting point of the booster body, thereby forming a longer air duct and improving the air volume.

[0013] The base and the cover plate have a first axial distance, the axial total thickness of the at least one booster body is greater than or equal to 50% of the first axial distance, and the axial total thickness of the at least one booster body is less than the first axial distance. In this way, the at least one booster body can have a better boosting effect.

[0014] The base and the cover plate have a first axial distance, the airflow groove has a second axial distance, the second axial distance is less than or equal to 50% of the first axial distance and is not 0. In this way, the airflow groove can be avoided to be too large, which affects the boosting effect of the at least one booster body.

[0015] The second axial distance is a fixed value. In this way, the airflow channel can accommodate more incoming airflow, thereby allowing more airflow to enter through the air inlet.

[0016] The fan wheel has several blades, each blade having a second axial thickness. The second axial distance of the airflow channel is greater than or equal to 80% of the second axial thickness and less than the first axial distance. Thus, the airflow channel facilitates airflow entry.

[0017] The system comprises two pressurizing elements, one located on the base and the other on the cover, with the airflow channel situated between them. This design allows the pressurizing elements to achieve a superior pressurization effect while simultaneously increasing the airflow volume at the air inlet.

[0018] The two booster bodies have the same first axial thickness. Therefore, the two booster bodies can achieve a better boosting effect.

[0019] The two pressurizing elements are aligned axially. In this way, the two pressurizing elements can work together to form the airflow channel.

[0020] The airflow channel gradually widens radially from the guide surface toward the sidewall. This airflow channel further reduces the generation of vortices, thus further reducing noise caused by vortices.

[0021] The airflow channel tapers radially from the guide surface toward the sidewall. This airflow channel further reduces vortex generation, thus further reducing noise caused by vortices.

[0022] The at least one pressurizing element is located on the base, and the airflow channel is located between the at least one pressurizing element and the cover plate. In this way, the pressurizing element can achieve a better pressurization effect and further increase the air intake volume of the air inlet.

[0023] The airflow channel tapers or expands radially from the guide surface toward the sidewall. This can further increase the air intake volume of the air inlet and reduce noise caused by eddies.

[0024] The at least one pressurizing element is located on the cover plate, and the airflow channel is located between the at least one pressurizing element and the base. In this way, the pressurizing element can achieve a better pressurization effect and further increase the air intake volume of the air inlet.

[0025] The airflow channel tapers or expands radially from the guide surface toward the sidewall. This can further increase the air intake volume of the air inlet and reduce noise caused by eddies. Attached Figure Description

[0026] Figure 1 : A diagram of an existing cooling fan; Figure 2 : An exploded perspective view of the first embodiment of the present invention; Figure 3 Side view of the first embodiment of the present invention; Figure 4 : A combined front view of the first embodiment of the present invention; Figure 5 :along Figure 4 AA-line cross-section; Figure 6 The pressure booster of the second embodiment of the present invention is located on the base. Figure 7 The pressurizing body of the second embodiment of the present invention is located in the cover plate diagram; Figure 8 : A diagram showing the airflow channel gradually expanding towards the side wall according to the third embodiment of the present invention; Figure 9 : A diagram showing the gradual reduction of the airflow channel towards the side wall in the third embodiment of the present invention; Figure 10 The pressure booster of the fourth embodiment of the present invention is located on the base. Figure 11 The pressurizing body of the fourth embodiment of the present invention is located in the cover plate diagram.

[0027] Explanation of reference numerals in the attached figures: [This invention] 1: Sector frame 11: Base 12: Side wall 13: Cover plate 14: Air Inlet 15: Air vent 16: Shaft tube 17: Stator 2: Fan wheel 21: Wheel hub 22: Leaf 23: Shaft 3: Pressurization unit 31: Guide surface 31a: First end 31b: Second end 4: Airflow channel D: Rotation direction F: Cooling fan R: Air duct R1: High-voltage zone R2: Strong wind zone S: Reference plane O: Geometric center H: Radial spacing H1: First axial distance H2: Second axial distance M1: First axial thickness M2: Second axial thickness ﹝existing﹞ 9: Cooling fan 91: Shell 92: Axial air inlet 93: Radial air outlet 94: Fan wheel 95: Boost Zone 96: Protrusion. Detailed Implementation

[0028] To make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments of the present invention are described below in detail with reference to the accompanying drawings; in addition, those symbols that are used in different drawings are considered to be the same and their descriptions will be omitted.

[0029] Please refer to Figure 2 , Figure 3 As shown, it is a first embodiment of the cooling fan F of the present invention, including a fan frame 1, a fan wheel 2, at least one pressure booster 3 and an airflow channel 4. The fan wheel 2 is rotatably disposed in the fan frame 1, and the at least one pressure booster 3 and the airflow channel 4 are located in the fan frame 1.

[0030] 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 an air inlet 14 located on the cover plate 13, and the base 11, the side wall 12, and the cover plate 13 together form an air outlet 15. The base 11 has a shaft tube 16, and a stencil 17 is located on the outer periphery of the shaft tube 16.

[0031] Please refer to Figure 2 , Figure 4As 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, one end of which is connected and positioned to the hub 21, and the other end of which is located in the shaft tube 16. An air duct R may be provided inside the fan frame 1 along a rotation direction D of the fan wheel 2, the air duct R connecting the air inlet 14 and the air outlet 15. Thus, the fan wheel 2 can rotate to guide airflow from the air inlet 14 into the air duct R of the fan frame 1, and then guide the airflow out from the air outlet 15.

[0032] Please continue reading. Figure 3 , Figure 4 As shown, the fan frame 1 has a virtual reference plane S, which passes through a geometric center O of the air inlet 14, and is radially orthogonal to the air outlet 15. According to the rotation direction D of the fan wheel 2 (with... Figure 4 (Taking a counter-clockwise direction as an example), the reference plane S can sequentially divide the air duct R into a high-pressure zone R1 and a strong-wind zone R2. Furthermore, the air duct R can radially expand from the high-pressure zone R1 towards the strong-wind zone R2, and a high-pressure to low-pressure transition can occur from the high-pressure zone R1 to the strong-wind zone R2. Thus, a pressure difference can be generated through the radially expanding air duct R, allowing airflow to be continuously introduced through the air inlet 14 and discharged through the air outlet 15.

[0033] At least one pressurizing element 3 is located within the fan frame 1 and is connected to the side wall 12. The at least one pressurizing element 3 and the side wall 12 together form a radial distance H with the fan wheel 2 to form the air duct R. The at least one pressurizing element 3 can be located in the high-pressure zone R1 to generate high air pressure. Thus, the at least one pressurizing element 3 can form the starting point of the air duct R. Preferably, the at least one pressurizing element 3 can be adjacent to the air outlet 15 of the high-pressure zone R1. Thus, the starting point of the air duct R is formed by the at least one pressurizing element 3, thereby forming a longer air duct R, which has the effect of increasing air volume.

[0034] The at least one pressurizing body 3 may have a guide surface 31 facing the fan wheel 2, that is, the guide surface 31 is radially oriented towards the plurality of blades 22, and the radial distance H is formed between the guide surface 31 and the fan wheel 2, so that the airflow entering through the air inlet 14 can begin to be pressurized by passing through the at least one pressurizing body 3. Further, the guide surface 31 extends radially approximately along the rotation direction D of the fan wheel 2. Preferably, the guide surface 31 has a first end 31a and a second end 31b sequentially along the rotation direction D of the fan wheel 2, and the radial distance H between the guide surface 31 and the fan wheel 2 can gradually increase from the first end 31a to the second end 31b. That is, the first end 31a has the minimum radial distance H between it and the fan wheel 2, and the second end 31b is connected to the sidewall 12. Therefore, the at least one pressurizing body 3 and the side wall 12 can together form a gradually expanding air duct R with the fan wheel 2, which has the function of generating a pressure difference.

[0035] Please continue reading. Figure 5 As shown, the number of at least one pressurizing body 3 can be adjusted as needed. For example, the number of at least one pressurizing body 3 can be one, two, or even more, and the present invention is not limited thereto. In this embodiment, there are two pressurizing bodies 3, which are respectively located on the base 11 and the cover plate 13. The two pressurizing bodies 3 can be aligned axially. The two pressurizing bodies 3 can each have a first axial thickness M1. The first axial thickness M1 of the two pressurizing bodies 3 can be the same, or the first axial thickness M1 of the two pressurizing bodies 3 can be different. In addition, there can be a first axial distance H1 between the base 11 and the cover plate 13. The total axial thickness of the at least one pressurizing body 3 is greater than or equal to 50% of the first axial distance H1, and the total axial thickness of the at least one pressurizing body 3 is less than the first axial distance H1. For example, in this embodiment, the total thickness 2×M1 of the two pressurizing bodies 3 is greater than or equal to 50% of the first axial distance H1. In this way, the two pressurizing bodies 3 can have a better pressurization effect. Preferably, the first axial thickness M1 can be 1 to 1.1 mm, and the first axial distance H1 can be 3.8 to 4.2 mm.

[0036] The airflow channel 4 is located between the base 11 and the cover plate 13. The airflow channel 4 is axially aligned with the at least one pressurizing body 3 and extends radially to the guide surface 31 of the at least one pressurizing body 3 to connect with the air duct R. The airflow channel 4 can also extend radially towards the side wall 12 to connect with the side wall 12. Thus, when the airflow from the air inlet 14 enters the air duct R adjacent to the at least one pressurizing body 3, the airflow can re-enter the airflow channel 4. That is, after the airflow is introduced through the air inlet 14, it can not only enter the air duct R, but also further accommodate more incoming airflow through the airflow channel 4, thereby increasing the air intake volume of the air inlet 14. Furthermore, the airflow channel 4 can disrupt the vortices at the tips of the blades 22, reducing noise caused by the vortices.

[0037] In this embodiment, the airflow channel 4 can be located between the two booster bodies 3. The airflow channel 4 has a second axial distance H2, which can be a fixed value to ensure that the second axial distance H2 is equidistant, i.e., the distance between the two booster bodies 3 is equidistant. It is worth noting that the second axial distance H2 is less than or equal to 50% of the first axial distance H1 and is not 0, which can prevent the airflow channel 4 from being too large and affecting the boosting effect of the at least one booster body 3. In addition, the plurality of blades 22 have a second axial thickness M2, and the second axial distance H2 of the airflow channel 4 is greater than or equal to 80% of the second axial thickness M2 of the plurality of blades 22, and the second axial distance H2 is less than the first axial distance H1. Furthermore, in this embodiment, the second axial thickness M2 can be the distance from the upper edge to the lower edge of each blade 22, including the connecting ring. In this way, the airflow channel 4 can facilitate the entry of airflow. Therefore, the present invention, through the at least one pressurizing body 3, not only achieves a better pressurization effect, but also, through the airflow channel 4, can further increase the air intake volume of the air inlet 14. Preferably, the second axial distance H2 can be 2 to 2.1 mm, and the second axial thickness M2 can be 2.4 mm.

[0038] Please refer to Figure 6 , Figure 7 As shown, this is a second embodiment of the cooling fan F of the present invention. In this embodiment, the booster 3 is a single unit, and the booster 3 can be located on the base 11 (e.g., Figure 6 This allows the airflow channel 4 to be located between the pressurizing body 3 and the cover plate 13. Alternatively, the pressurizing body 3 can be located on the cover plate 13 (e.g., Figure 7The airflow channel 4 is positioned between the pressurizing body 3 and the base 11. In this way, the pressurizing body 3 can achieve a better pressurization effect while the airflow channel 4 can further increase the air intake volume of the air inlet 14. Furthermore, the airflow channel 4 can be equidistant in the axial direction; that is, the pressurizing body 3 and the cover plate 13 are equidistant, or the pressurizing body 3 and the base 11 are equidistant.

[0039] Please refer to Figure 8 , Figure 9 As shown, this is the third embodiment of the cooling fan F of the present invention. This embodiment is largely the same as the first embodiment described above. In this embodiment, the two booster bodies 3 are respectively located on the base 11 and the cover plate 13. The airflow channel 4 can be located between the two booster bodies 3. The airflow channel 4 can gradually expand radially from the guide surface 31 toward the side wall 12 (e.g., Figure 8 Alternatively, the airflow channel 4 may taper radially from the guide surface 31 toward the sidewall 12 (e.g., Figure 9 Thus, the airflow channel 4 can further reduce the generation of vortices, thereby further reducing the noise caused by vortices.

[0040] Please refer to Figure 10 , Figure 11 As shown, this is the fourth embodiment of the cooling fan F of the present invention. This embodiment is largely the same as the second embodiment described above. In this embodiment, there is one booster 3, which can be located on the base 11, so that the airflow channel 4 is located between the booster 3 and the cover plate 13. The airflow channel 4 can be radially tapered from the guide surface 31 toward the side wall 12 (e.g., Figure 10 Alternatively, the pressurizing body 3 can be located on the cover plate 13, and the airflow channel 4 can be located between the pressurizing body 3 and the base 11. The airflow channel 4 can be radially tapered from the guide surface 31 toward the side wall 12 (e.g., Figure 11 (or gradually expand.) In this way, it can further increase the air intake volume of the air inlet 14 and reduce the noise caused by vortices.

[0041] In summary, the cooling fan of the present invention axially aligns at least one pressurizing body through the airflow channel, and the airflow channel extends radially to the guide surface to connect with the air duct. In this way, after the airflow is introduced through the air inlet, it can not only enter the air duct, but also further accommodate more incoming airflow through the airflow channel, thereby allowing more airflow to enter through the air inlet, thereby increasing the air intake volume of the air inlet and achieving the effect of improving the cooling efficiency of the cooling fan.

[0042] Although the present invention has been disclosed using the above preferred embodiments, it is not intended to limit the 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 invention still fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention includes all changes within the meaning and equivalent scope of the appended claims. Furthermore, when the above embodiments can be combined, the present invention includes any combination of embodiments.

Claims

1. A heat dissipating fan characterized by, The fan frame has a reference plane passing through a geometric center of the air inlet, the reference plane being orthogonal to the air outlet in the radial direction, the reference plane sequentially dividing the air passage into a high pressure zone and a high wind zone in the rotation direction, the booster body being located in the high pressure zone. The fan frame has a first axial distance between the base and the cover plate, an axial total thickness of the at least one booster body being greater than or equal to 50% of the first axial distance, and the axial total thickness of the at least one booster body being less than the first axial distance. The fan frame has a first axial distance between the base and the cover plate, the airflow channel having a second axial distance, the second axial distance being less than or equal to 50% of the first axial distance and not being 0. The second axial distance is a constant value. The fan wheel has a plurality of blades, the plurality of blades having a second axial thickness, the second axial distance of the airflow channel being greater than or equal to 80% of the second axial thickness.

2. The heat dissipating fan as set forth in claim 1, wherein The at least one booster body is two, the two booster bodies being located at the base and the cover plate respectively, the airflow channel being located between the two booster bodies.

3. The heat dissipating fan as set forth in claim 2, wherein The two booster bodies have the same first axial thickness.

4. The heat dissipating fan as set forth in claim 1, wherein The two booster bodies are aligned in the axial direction.

5. The heat dissipating fan as set forth in claim 1, wherein The airflow channel is diverging in the radial direction from the guide surface to the side wall.

6. The heat dissipating fan as set forth in claim 5, wherein The airflow channel is converging in the radial direction from the guide surface to the side wall.

7. The heat dissipating fan as set forth in claim 1, wherein The at least one booster body is located at the base, the airflow channel being located between the at least one booster body and the cover plate.

8. The heat dissipating fan as set forth in claim 1, wherein The airflow channel is converging or diverging in the radial direction from the guide surface to the side wall.

9. The heat dissipating fan as set forth in claim 8, wherein The at least one booster body is located at the cover plate, the airflow channel being located between the at least one booster body and the base.

10. The heat dissipating fan as set forth in claim 8, wherein The airflow channel is converging or diverging in the radial direction from the guide surface to the side wall.

11. The heat dissipating fan as set forth in claim 8, wherein ​ 12. The heat dissipating fan as set forth in claim 8, wherein ​ 13. The heat dissipating fan of claim 1, wherein, ​ 14. The heat dissipating fan of claim 13, wherein, ​ 15. The heat dissipating fan of claim 1, wherein, ​ 16. The heat dissipating fan of claim 15, wherein, ​

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