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 utility model relates to a wind driving device, in particular to a cooling fan for assisting the heat dissipation of an electronic device. Background Art

[0002] Please refer to Figure 1 , which is an existing cooling fan 9. The existing cooling fan 9 has a housing 91 with an axial air inlet 92 and a radial air outlet 93. An impeller 94 is rotatably located in the housing 91. When the impeller 94 rotates, it can drive air to axially flow into the housing 91 from the axial air inlet 92 and flow out from the radial air outlet 93. There is a pressurizing area 95 in the air flow channel of the cooling fan 9. In the pressurizing area 95, a relatively narrow gap is formed between the impeller 94 and the inner wall of the housing 91, so that the air flowing in from the axial air inlet 92 can be compressed as the impeller 94 rotates.

[0003] Generally, a protruding portion 96 is provided at the starting point of the pressurizing area 95. The protruding portion 96 protrudes from the inner wall of the housing 91 towards the impeller 94. In this way, the protruding portion 96 can form a narrow gap with the impeller 94 to pressurize the air flow. However, the narrow gap between the protruding portion 96 and the impeller 94 causes a decrease in the air volume entering from the axial air inlet 92 at the position of the protruding portion 96, thereby resulting in insufficient air intake.

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

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

[0006] In the full text of the utility model, the directional terms or their approximate terms, such as "front", "rear", "left", "right", "upper (top)", "lower (bottom)", "inner", "outer", "side", etc., mainly refer to the directions of the attached drawings. Each directional term or its approximate term is only used to assist in explaining and understanding the embodiments of the utility model, and is not used to limit the utility model.

[0007] In the full text of the utility model, the quantifiers "a" or "an" are used for the elements and components described, only for convenience of use and to provide the general meaning of the scope of the utility model; in the utility model, it should be interpreted as including one or at least one, and the single concept also includes the case of multiple, unless it clearly means otherwise.

[0008] As used throughout this utility model, approximate terms such as "combination", "assembly" or "connection" mainly include forms where components can still be separated without being damaged after connection, or forms where components cannot be separated after connection. Those skilled in the art can select according to the material of the components to be connected or the assembly requirements.

[0009] The cooling fan of the present utility model includes: a fan frame having a base, a side wall connected to the base, and a cover plate connected to the side wall. The cover plate is opposite to the base. The cover plate has an air inlet, and the base, the side wall and the cover plate jointly form an air outlet; a fan wheel rotatably located within the fan frame. The fan frame has an air duct; at least one pressurizing body adjacent to the air duct. The at least one pressurizing body has a guiding surface facing the fan wheel; and an air flow channel located within the fan frame. The air flow channel is axially aligned with the at least one pressurizing body and radially extends to the guiding surface to communicate with the air duct, and the air flow channel further radially extends towards the side wall to connect to the side wall.

[0010] Therefore, in the cooling fan of the present utility model, the air flow channel is axially aligned with the at least one pressurizing body, and the air flow channel radially extends to the guiding surface to communicate with the air duct. In this way, after the air flow is introduced from the air inlet, not only can it enter the air duct, but it can also further accommodate more incoming air through the air flow channel. Furthermore, more air can enter from the air inlet, thereby increasing the air intake at the air inlet and achieving the effect of improving the heat dissipation efficiency of the cooling fan.

[0011] Among them, the fan frame has a reference plane passing through the geometric center of the air inlet. The reference plane is radially orthogonal to the air outlet. The reference plane divides the air duct into a high-pressure area and a strong-wind area in sequence according to the rotation direction, and the pressurizing body is located in the high-pressure area. In this way, the air duct can form a pressure gradient from high pressure to low pressure from the high-pressure area to the strong-wind area, enabling the air flow to be continuously introduced from the air inlet and discharged from the air outlet.

[0012] Among them, the at least one pressurizing body is adjacent to the air outlet. In this way, the starting point of the air duct is formed by the pressurizing body, thereby forming a longer air duct, which has the effect of increasing the air volume.

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

[0014] Among them, there is a first axial distance between the base and the cover plate, and the air flow channel has a second axial distance, and the second axial distance is less than or equal to 50% of the first axial distance and is not zero. In this way, it is possible to avoid the air flow channel being too large and affecting the boosting effect of the at least one boosting body.

[0015] Among them, the second axial distance is a fixed value. In this way, the air flow channel can further accommodate more incoming air flow, and thus can enable more air flow to enter from the air inlet.

[0016] Among them, the fan wheel has several blades, and the several blades have a second axial thickness, and the second axial distance of the air flow channel is greater than or equal to 80% of the second axial thickness and less than the first axial distance. In this way, the air flow channel can have the effect of being easy for air flow to enter.

[0017] Among them, the at least one boosting body is two, and the two boosting bodies are respectively located on the base and the cover plate, and the air flow channel is located between the two boosting bodies. In this way, while the boosting body can form a better boosting effect, it can further enhance the air intake volume of the air inlet.

[0018] Among them, the two boosting bodies have the same first axial thickness. In this way, the two boosting bodies can have the effect of better boosting effect.

[0019] Among them, the two boosting bodies are axially aligned. In this way, the two boosting bodies can jointly form the air flow channel.

[0020] Among them, the air flow channel gradually expands in the radial direction from the guiding surface to the side wall. In this way, the air flow channel can further reduce the generation of eddy currents and has the effect of further reducing the noise caused by the eddy currents.

[0021] Among them, the air flow channel gradually contracts in the radial direction from the guiding surface to the side wall. In this way, the air flow channel can further reduce the generation of eddy currents and has the effect of further reducing the noise caused by the eddy currents.

[0022] Among them, the at least one boosting body is located on the base, and the air flow channel is located between the at least one boosting body and the cover plate. In this way, the boosting body can form a better boosting effect and has the effect of further enhancing the air intake volume of the air inlet.

[0023] Among them, the air flow channel gradually contracts or expands in the radial direction from the guiding surface to the side wall. In this way, it can have the effect of further enhancing the air intake volume of the air inlet and reducing the noise caused by the eddy currents.

[0024] Among them, the at least one pressurizing body is located on the cover plate, and the air flow channel is located between the at least one pressurizing body and the base. In this way, the pressurizing body can achieve a better pressurizing effect and has the effect of further increasing the air intake volume at the air inlet.

[0025] Among them, the air flow channel tapers or expands radially from the guiding surface towards the side wall. In this way, it can have the effect of further increasing the air intake volume at the air inlet and reducing the noise caused by eddy currents. Description of the Drawings

[0026] Figure 1 : A diagram of an existing cooling fan;

[0027] Figure 2 : An exploded perspective view of the first embodiment of the present invention;

[0028] Figure 3 : A side view of the first embodiment of the present invention;

[0029] Figure 4 : A combined front view of the first embodiment of the present invention;

[0030] Figure 5 : Along Figure 4 Cross-sectional view taken along line A-A;

[0031] Figure 6 : Diagram of the pressurizing body located on the base in the second embodiment of the present invention;

[0032] Figure 7 : Diagram of the pressurizing body located on the cover plate in the second embodiment of the present invention;

[0033] Figure 8 : Diagram of the air flow channel expanding towards the side wall in the third embodiment of the present invention;

[0034] Figure 9 : Diagram of the air flow channel tapering towards the side wall in the third embodiment of the present invention;

[0035] Figure 10 : Diagram of the pressurizing body located on the base in the fourth embodiment of the present invention;

[0036] Figure 11 : Diagram of the pressurizing body located on the cover plate in the fourth embodiment of the present invention.

[0037] Description of the Reference Numerals:

[0038] ﹝The present invention﹞

[0039] 1: Fan frame

[0040] 11: Base

[0041] 12: Side wall

[0042] 13: Cover plate

[0043] 14: Air inlet

[0044] 15: Air outlet

[0045] 16: Shaft tube

[0046] 17: Stator

[0047] 2: Fan wheel

[0048] 21: Hub

[0049] 22: Blade

[0050] 23: Rotating shaft

[0051] 3: Booster

[0052] 31: Flow guiding surface

[0053] 31a: First end

[0054] 31b: Second end

[0055] 4: Air flow channel

[0056] D: Rotation direction

[0057] F: Cooling fan

[0058] R: Air duct

[0059] R1: High-pressure area

[0060] R2: Strong wind area

[0061] S: Reference plane

[0062] O: Geometric center

[0063] H: Radial spacing

[0064] H1: First axial distance

[0065] H2: Second axial distance

[0066] M1: First axial thickness

[0067] M2: Second axial thickness

[0068] ﹝Existing﹞

[0069] 9: Cooling fan

[0070] 91: Housing

[0071] 92: Axial air inlet

[0072] 93: Radial air outlet

[0073] 94: Fan wheel

[0074] 95: Boosting area

[0075] 96: Protrusion. Detailed implementation manners

[0076] To make the above and other objects, features, and advantages of the present utility model more obvious and understandable, the following specifically gives preferred embodiments of the present utility model and makes detailed descriptions in conjunction with the accompanying drawings; in addition, the same symbols marked in different drawings are regarded as the same, and their descriptions will be omitted.

[0077] Please refer to Figure 2 、 Figure 3 As shown, it is the first embodiment of the cooling fan F of the present utility model, including a fan frame 1, a fan wheel 2, at least one boosting body 3, and an air flow channel 4. The fan wheel 2 is rotatably arranged in the fan frame 1, and the at least one boosting body 3 and the air flow channel 4 are located in the fan frame 1.

[0078] The fan frame 1 has a base 11 and a side wall 12. The side wall 12 is connected to the base 11. For example, the side wall 12 and the base 11 can be integrally formed. The fan frame 1 further has a cover plate 13. The cover plate 13 is connected to the side wall 12. The cover plate 13 and the side wall 12 can be integrally formed, and the cover plate 13 is 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 jointly form an air outlet 15. The base 11 has a shaft tube 16, and a stator 17 is located on the outer periphery of the shaft tube 16.

[0079] Please refer to Figure 2 、 Figure 4 As shown, the fan wheel 2 can have a hub 21 and several blades 22. The several blades 22 can be arranged around the hub 21. The fan wheel 2 can have a rotating shaft 23. One end of the rotating shaft 23 can be integrally positioned on the hub 21, and the other end of the rotating shaft 23 is located in the shaft tube 16. An air duct R can be provided in the fan frame 1 along a rotation direction D of the fan wheel 2. The air duct R communicates the air inlet 14 and the air outlet 15. In this way, the fan wheel 2 can rotate to introduce air flow from the air inlet 14 into the air duct R of the fan frame 1, and then export the air flow from the air outlet 15.

[0080] Please continue to refer to Figure 3 、 Figure 4 As shown, the fan frame 1 has a virtual reference plane S. The reference plane S passes through the geometric center O of the air inlet 14, and the reference plane S is radially orthogonal to the air outlet 15. Along the rotation direction D of the fan wheel 2 (in Figure 4For example, in the counterclockwise direction, the reference plane S can sequentially divide the air duct R into a high-pressure area R1 and a strong-wind area R2. Further, the air duct R can be radially expanded from the high-pressure area R1 towards the strong-wind area R2, and a high pressure to a low pressure can be formed from the high-pressure area R1 to the strong-wind area R2. In this way, a pressure difference can be generated through the radially expanding air duct R, enabling the air flow to be continuously introduced from the air inlet 14 and discharged from the air outlet 15.

[0081] The at least one pressurizing body 3 is located within the fan frame 1. The at least one pressurizing body 3 is connected to the side wall 12. The at least one pressurizing body 3 and the side wall 12 can jointly form a radial spacing H with the fan wheel 2 to form the air duct R in this way. The at least one pressurizing body 3 can be located in the high-pressure area R1 to form a high wind pressure through the at least one pressurizing body 3. In this way, the at least one pressurizing body 3 can form the starting point of the air duct R. Preferably, the at least one pressurizing body 3 can be adjacent to the air outlet 15 of the high-pressure area R1. In this way, the at least one pressurizing body 3 forms the starting point of the air duct R, and a relatively long air duct R can be formed in this way, which has the effect of increasing the air volume.

[0082] The at least one pressurizing body 3 can have a guiding surface 31 facing the fan wheel 2. That is, the guiding surface 31 faces the several blades 22 in the radial direction. A radial spacing H is formed between the guiding surface 31 and the fan wheel 2, enabling the air flow entering from the air inlet 14 to start to be pressurized through the at least one pressurizing body 3. Further, the guiding surface 31 extends substantially along the rotation direction D of the fan wheel 2 in the radial direction. Preferably, the guiding surface 31 sequentially has a first end 31a and a second end 31b along the rotation direction D of the fan wheel 2. The radial spacing H between the guiding surface 31 and the fan wheel 2 can gradually increase from the first end 31a towards the second end 31b. That is, the smallest radial spacing H exists between the first end 31a and the fan wheel 2, and the second end 31b is connected to the side wall 12. Therefore, the at least one pressurizing body 3 and the side wall 12 can jointly form a gradually expanding air duct R with the fan wheel 2, which has the effect of generating a pressure difference.

[0083] Please continue to refer to Figure 5As shown, the number of the at least one pressurizing body 3 can be adjusted according to requirements. For example, the number of the at least one pressurizing body 3 can be one, two or even more, which is not limited in the present utility model. In this embodiment, the at least one pressurizing body 3 is two, and the two pressurizing bodies 3 are respectively located on the base 11 and the cover plate 13. The two pressurizing bodies 3 can be axially aligned. The two pressurizing bodies 3 can respectively 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 axial total thickness of the at least one pressurizing body 3 is greater than or equal to 50% of the first axial distance H1, and the axial total 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. Thus, the two pressurizing bodies 3 can have a better pressurizing 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.

[0084] The air flow channel 4 is located between the base 11 and the cover plate 13. The air flow channel 4 is axially aligned with the at least one pressurizing body 3. The air flow channel 4 extends radially to the guide surface 31 of the at least one pressurizing body 3 to communicate with the air duct R. The air flow channel 4 can also extend radially toward the side wall 12 to connect with the side wall 12. Thus, when the air flow at the air inlet 14 enters the air duct R adjacent to the at least one pressurizing body 3, the air flow can enter the air flow channel 4 again. That is, after the air flow is introduced from the air inlet 14, it can not only enter the air duct R, but also further accommodate more incoming air through the air flow channel 4, so that more air flow can enter from the air inlet 14, thereby improving the air intake volume of the air inlet 14. In addition, the air flow channel 4 can destroy the eddy current at the front end of the several blades 22, and has the effect of reducing the noise caused by the eddy current.

[0085] In this embodiment, the air flow channel 4 can be located between the two pressurizing bodies 3. The air flow channel 4 has a second axial distance H2, and the second axial distance H2 can be a fixed value to make the second axial distance H2 equidistant, that is, the distance between the two pressurizing bodies 3 is equidistant. It should be noted that the second axial distance H2 is less than or equal to 50% of the first axial distance H1 and is not zero, which can prevent the air flow channel 4 from being too large and affecting the pressurizing effect of at least one pressurizing body 3. In addition, the plurality of blades 22 have a second axial thickness M2, and the second axial distance H2 of the air flow 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. In addition, 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 air flow channel 4 can have the function of facilitating the entry of air flow. Therefore, while the at least one pressurizing body 3 forms a better pressurizing effect in the present invention, the air flow channel 4 can further enhance the air intake volume of the air inlet 14. Preferably, the second axial distance H2 can be 2 - 2.1 mm, and the second axial thickness M2 can be 2.4 mm.

[0086] Please refer to Figure 6 、 Figure 7 shown in the figure, which is the second embodiment of the heat dissipation fan F of the present invention. In this embodiment, there is one pressurizing body 3, and the pressurizing body 3 can be located on the base 11 (such as Figure 6 ), so that the air flow channel 4 is located between the pressurizing body 3 and the cover plate 13. Alternatively, the pressurizing body 3 can be located on the cover plate 13 (such as Figure 7 ), so that the air flow channel 4 is located between the pressurizing body 3 and the base 11. In this way, while the pressurizing body 3 forms a better pressurizing effect, the air flow channel 4 can further enhance the air intake volume of the air inlet 14. Also, the air flow channel 4 can be equidistant axially, that is, the distance between the pressurizing body 3 and the cover plate 13 is equidistant, or the distance between the pressurizing body 3 and the base 11 is equidistant.

[0087] Please refer to Figure 8 、 Figure 9 shown in the figure, which is the third embodiment of the heat dissipation fan F of the present invention. This embodiment is substantially the same as the above-mentioned first embodiment. In this embodiment, the two pressurizing bodies 3 are respectively located on the base 11 and the cover plate 13, and the air flow channel 4 can be located between the two pressurizing bodies 3. The air flow channel 4 can be gradually expanded from the guiding surface 31 towards the side wall 12 in the radial direction (such as Figure 8 ), or the air flow channel 4 can be gradually contracted from the guiding surface 31 towards the side wall 12 in the radial direction (such as Figure 9). In this way, the air flow channel 4 can further reduce the generation of eddy currents and has the effect of further reducing the noise caused by eddy currents.

[0088] Please refer to Figure 10 , Figure 11 as shown. It is the fourth embodiment of the heat dissipation fan F of the present utility model. This embodiment is substantially the same as the above-mentioned second embodiment. In this embodiment, there is one pressurizing body 3, and the pressurizing body 3 can be located on the base 11, so that the air flow channel 4 is located between the pressurizing body 3 and the cover plate 13. The air flow channel 4 can taper (such as Figure 10 ) or expand radially from the guide surface 31 towards the side wall 12. Alternatively, the pressurizing body 3 can be located on the cover plate 13, and the air flow channel 4 is located between the pressurizing body 3 and the base 11. The air flow channel 4 can taper (such as Figure 11 ) or expand radially from the guide surface 31 towards the side wall 12. In this way, it can have the effect of further increasing the air intake volume of the air inlet 14 and reducing the noise caused by eddy currents.

[0089] In summary, for the heat dissipation fan of the present utility model, the utility model axially aligns the air flow channel with the at least one pressurizing body, and the air flow channel extends radially to the guide surface to communicate with the air duct. In this way, after the air flow is introduced from the air inlet, it can not only enter the air duct, but also further accommodate more incoming air through the air flow channel. Furthermore, more air flow can enter from the air inlet, thereby increasing the air intake volume of the air inlet and achieving the effect of improving the heat dissipation efficiency of the heat dissipation fan.

[0090] Although the present utility model has been disclosed by using the above-mentioned preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art, without departing from the spirit and scope of the present utility model, making various changes and modifications to the above-mentioned embodiments still belongs to the technical scope protected by the present utility model. Therefore, the protection scope of the present utility model shall include the meaning described in the appended claims and all changes within the equivalent scope. Also, when the above-mentioned several embodiments can be combined, the present utility model includes any combined implementation patterns.

Claims

1. A cooling fan, characterized in that, Comprising: A fan frame having a base, a side wall connecting the base, a cover plate connecting the side wall, the cover plate being opposite to the base, the cover plate having an air inlet, and the base, the side wall and the cover plate jointly forming an air outlet; A fan wheel rotatably located within the fan frame, the fan frame having an air duct; At least one pressurizing body adjacent to the air duct, the at least one pressurizing body having a guiding surface facing the fan wheel; and An air flow channel located within the fan frame, the air flow channel axially aligned with the at least one pressurizing body, the air flow channel radially extending to the guiding surface to communicate with the air duct, and the air flow channel further radially extending towards the side wall to connect to the side wall.

2. The cooling fan according to claim 1, characterized in that, The fan frame has a reference plane passing through the geometric center of the air inlet, the reference plane being radially orthogonal to the air outlet, and the reference plane sequentially divides the air duct into a high-pressure zone and a strong-wind zone according to the rotation direction, and the pressurizing body is located in the high-pressure zone.

3. The cooling fan according to claim 2, wherein, The at least one pressurizing body is adjacent to the air outlet.

4. The cooling fan according to claim 1, wherein There is a first axial distance between the base and the cover plate, the total axial thickness of the at least one pressurizing body is greater than or equal to 50% of the first axial distance, and the total axial thickness of the at least one pressurizing body is less than the first axial distance.

5. The cooling fan according to claim 1, wherein, There is a first axial distance between the base and the cover plate, the air flow channel has a second axial distance, and the second axial distance is less than or equal to 50% of the first axial distance and is not zero.

6. The cooling fan according to claim 5, wherein, The second axial distance is a fixed value.

7. The cooling fan according to claim 1, characterized in that, The fan wheel has a plurality of blades, the plurality of blades having a second axial thickness, and the second axial distance of the air flow channel is greater than or equal to 80% of the second axial thickness.

8. The cooling fan according to claim 1, characterized in that, The at least one pressurizing body is two, and the two pressurizing bodies are respectively located on the base and the cover plate, and the air flow channel is located between the two pressurizing bodies.

9. The cooling fan according to claim 8, wherein, The two pressurizing bodies have the same first axial thickness.

10. The cooling fan according to claim 8, characterized in that, The two pressurizing bodies are axially aligned.

11. The cooling fan according to claim 8, wherein, The air flow channel gradually expands radially from the guiding surface towards the side wall.

12. The cooling fan according to claim 8, characterized in that, The air flow channel gradually contracts radially from the guiding surface towards the side wall.

13. The cooling fan according to claim 1, characterized in that, The at least one pressurizing body is located on the base, and the air flow channel is located between the at least one pressurizing body and the cover plate.

14. The cooling fan according to claim 13, characterized in that, The air flow channel gradually contracts or expands radially from the guiding surface towards the side wall.

15. The cooling fan according to claim 1, characterized in that The at least one pressurizing body is located on the cover plate, and the air flow channel is located between the at least one pressurizing body and the base.

16. The cooling fan according to claim 15, wherein, The air flow channel gradually contracts or expands radially from the guiding surface towards the side wall.

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