TWM624190U - Heat-dissipating fan - Google Patents

Abstract

A cooling fan is used to solve the problem of too much noise of the conventional cooling fan. The system includes: a fan frame with a side wall connected to a base plate, a cover plate connected to the side wall, an air inlet located on the cover plate, the base plate, the side wall and the cover plate together forming at least one air outlet; a fan a wheel; and at least one noise reduction structure adjacent to the air inlet and recessed on the inner surface of the cover plate; wherein a first reference plane and a second reference plane divide the fan frame into a counterclockwise order. A quadrant, a second quadrant, a third quadrant and a fourth quadrant, the minimum radial distance between the fan wheel and the side wall is located in the fourth quadrant, the first quadrant and the fourth quadrant form a high voltage area, the center of the air inlet deviates from the axis of the fan wheel in the direction of the high pressure area, and the noise reduction structure is located in the second quadrant.

Description

cooling fan

This creation relates to a cooling fan, especially a cooling fan for assisting the cooling of electronic devices.

Please refer to FIG. 1, which is a conventional cooling fan 9. The conventional cooling fan 9 has a casing 91. The casing 91 has a lower casing 911 and an upper casing 912 that can be combined with each other. A fan wheel 92 is rotatably disposed in the lower casing 911 , the upper casing 912 defines an air inlet 913 , and the lower casing 911 and the upper casing 912 together form an air outlet 914 . When the blades 921 of the fan wheel 92 rotate, the air flow can axially flow into the lower casing 911 through the air inlet 913 and flow out from the air outlet 914 laterally. An embodiment similar to the conventional cooling fan 9 has been disclosed in the ROC Patent No. I505768.

However, in the above-mentioned conventional cooling fan 9, when the plurality of fan blades 921 are rotated, the plurality of fan blades 921 will rub against the air to generate noise, and the airflow will partially impact on the plurality of fan blades 921 to cause the plurality of fan blades 921. Several fan blades 921 vibrate, thereby causing the casing 91 to generate a resonance effect, which makes it difficult to reduce the noise of the conventional cooling fan 9 during operation.

In view of this, it is still necessary to improve the conventional cooling fan.

In order to solve the above problems, the purpose of this creation is to provide a cooling fan, which can reduce the noise of the cooling fan.

The second purpose of this creation is to provide a cooling fan, which can improve the sound quality of the cooling fan.

Another object of the present creation is to provide a cooling fan, which can reduce the manufacturing cost.

Another object of the present invention is to provide a cooling fan, which can be matched with the overall system configurator.

The directional or similar terms described in the full text of this creation, such as "front", "back", "left", "right", "up (top)", "down (bottom)", "inside", "outside" , "sideways", etc., mainly refer to the directions of the attached drawings, and each directional or similar terms are only used to assist the description and understanding of the various embodiments of the present creation, and are not intended to limit the present creation.

The use of the quantifier "a" or "an" for the elements and components described in the full text of this creation is only for convenience and to provide the usual meaning of the scope of this creation; in this creation, it should be construed as including one or at least one, and a single The concept of also includes the plural case unless it is obvious that it means otherwise.

Similar terms such as "combination", "combination" or "assembly" mentioned in the whole text of this work mainly include the types of components that can be separated without destroying the components after connection, or the components cannot be separated after being connected, which are common knowledge in this field. It can be selected according to the material of the components to be connected or the assembly requirements.

The cooling fan of the present invention includes: a fan frame with a side wall connected to a base plate, a cover plate connected to the side wall and opposite to the base plate, an air inlet located on the cover plate, the base plate, the side wall and the cover The plates together form at least one air outlet; a fan wheel rotatably arranged in the fan frame; and at least one noise reduction structure adjacent to the air inlet and recessed on the inner surface of the cover plate; wherein, a first reference plane Parallel to the air outlet and passing through the axis of the fan wheel, a second reference plane is perpendicular to the air outlet and passes through the axis of the fan wheel, the first reference plane and the second reference plane divide the fan frame A first quadrant, a second quadrant, a third quadrant, and a fourth quadrant arranged counterclockwise in sequence, the fan wheel and the side wall have a minimum radial distance, and the minimum radial distance is located in the fourth quadrant Quadrant, the first quadrant and the fourth quadrant form a high pressure area, the second quadrant and the third quadrant form a strong wind area and are adjacent to the air outlet, and the center of the air inlet deviates from the fan wheel in the direction of the high pressure area. The axis, the noise reduction structure is located in the second quadrant.

Accordingly, in the cooling fan of the present invention, the noise reduction structure is adjacent to the air inlet and is recessed on the inner surface of the cover plate, so that in the process of introducing the external airflow from the air inlet, the sound waves of the resonance noise can be disturbed and generated. Attenuation has the effect of reducing noise.

Wherein, the noise reduction structure may have a groove communicating with the air inlet. In this way, the structure is simple and easy to manufacture, and has the effect of reducing the manufacturing cost.

Wherein, the noise reduction structure may protrude from the outer surface of the cover plate. In this way, it can be ensured that the airflow can be affected by the noise reduction structure when passing through the air inlet, which has the effect of noise reduction.

Wherein, the height of the noise reduction structure protruding from the outer surface of the cover plate may be 0.3-1 mm. In this way, the size of the noise reduction structure is moderate, which has a better effect of improving the performance of the fan.

Wherein, the center of the air inlet may not be located in the first quadrant or the second quadrant. In this way, the system has the effect of matching the overall system configuration.

Wherein, the center of the air inlet may be located on the first reference plane or in the fourth quadrant. In this way, the system has the effect of significantly increasing the wind pressure.

The number of the noise reduction structures may be several, and the total arc length of the several noise reduction structures adjacent to the air inlet may be 1/12-1/4 of the circumference of the air inlet. In this way, the sound quality of the cooling fan can be improved, which has the effect of noise reduction.

Wherein, the air inlet may have a radius of curvature, the outer edge of the noise reduction structure and the center of the air inlet may have a longest radial distance, the longest radial distance, and the ratio of the longest radial distance to the radius of curvature may be is 1.05 to 1.5. In this way, the sound quality of the cooling fan can be further improved, which has a better noise reduction effect.

The number of the noise reduction structures may be several, and the longest radial distances may be different. In this way, the sound quality of the cooling fan can also be improved, which has the effect of noise reduction.

Wherein, the number of the noise reduction structures can be several, and the longest radial distances of the several can be the same. In this way, the structure is simple and easy to manufacture, and has the effect of reducing the manufacturing cost.

The cooling fan of the present invention may further include at least one auxiliary noise reduction structure, the fan frame may have at least one auxiliary air inlet located on the base plate, and the auxiliary noise reduction structure may be adjacent to the auxiliary air inlet and recessed on the inner surface of the base plate. In this way, it can help to improve the effects of air volume, air pressure and noise reduction, and has the effect of improving the performance of the fan.

Wherein, the auxiliary noise reduction structure may not be positioned on the noise reduction structure. In this way, the auxiliary noise reduction structure is staggered from the noise reduction structure, which has the effect of preventing the sound waves of the resonance noise from being at the same frequency.

In order to make the above-mentioned and other purposes, features and advantages of this creation more obvious and easy to understand, the preferred embodiments of this creation are given below, and are described in detail with the accompanying drawings; in addition, the same symbols are marked in different drawings. are considered to be the same, and their descriptions will be omitted.

Please refer to FIG. 2 , which is the first embodiment of the cooling fan of the present invention, which includes a fan frame 1 , a fan wheel 2 and at least one noise reduction structure 3 , and the fan wheel 2 is rotatably arranged on the fan In the frame 1 , the noise reduction structure 3 is located in the fan frame 1 .

The fan frame 1 has a base plate 11 and a side wall 12, the side wall 12 is connected to the base plate 11, the fan frame 1 further has a cover plate 13, the cover plate 13 is connected to the side wall 12, and the cover plate 13 can be connected with the side wall 12. Opposite to the base plate 11 , the cover plate 13 may have an inner surface 131 and an outer surface 132 , and the inner surface 131 faces the base plate 11 . The fan frame 1 has an air inlet 14 located on the cover plate 13 . The air inlet 14 may have a curvature radius R1 (as shown in FIG. 3 ). The base plate 11 , the side wall 12 and the cover plate 13 together form a Air outlet 15.

In this embodiment, the base plate 11 can be made of metal material, the base plate 11 can be combined with the stator 16 (as shown in FIG. 6 ), the side wall 12 can be made of plastic material, and can optionally be coated by injection Combined with the base plate 11 ; in this way, the fan frame 1 can have appropriate structural strength, and the side walls 12 can be easily formed in various shapes designed according to different requirements. The cover plate 13 can be made of metal or plastic material according to requirements. In addition, the fan frame 1 may have a plurality of limiting pieces 17 connected to the top edge 12a of the side wall 12 , and the plurality of limiting pieces 17 may extend toward the fan wheel 2 . The cover When the plate 13 is combined with the side wall 12 , the cover plate 13 can be prevented from being pressed against the fan wheel 2 due to improper force, which has the effect of strengthening the overall structure of the fan frame 1 .

Referring to Figures 2 and 3, the fan wheel 2 may have a hub 21 and a plurality of blades 22 , and the plurality of blades 22 may be arranged around the hub 21 . The fan wheel 2 may have a rotating shaft 23 positioned on the hub 21, the axial direction of the rotating shaft 23 can define the axis X of the fan wheel 2, and the rotating shaft 23 is rotatably arranged on the stator 16 (as shown in FIG. 6 ). When the fan wheel 2 rotates, it can drive the airflow to flow into the interior of the fan frame 1 from the air inlet 14 , and then flow out from the air outlet 15 .

Referring to FIG. 3, a first reference plane S1 can be parallel to the end edge 15a of the air outlet 15 and pass through the axis X of the fan wheel 2, and a second reference plane S2 can be perpendicular to the air outlet 15 and pass through the axis X of the fan wheel 2. Through the axis X of the fan wheel 2, the first reference plane S1 and the second reference plane S2 can divide the fan frame 1 into a first quadrant Q1, a second quadrant Q2, a The third quadrant Q3 and a fourth quadrant Q4, the smallest radial distance between the fan wheel 2 and the side wall 12 can be located in the fourth quadrant Q4.

In detail, the first quadrant Q1 and the fourth quadrant Q4 can form a high pressure zone Z1, the second quadrant Q2 and the third quadrant Q3 can form a strong wind zone Z2 and are adjacent to the air outlet 15, the air inlet 14 The center C deviates from the axis X of the fan wheel 2 in the direction of the high pressure zone Z1, the center C of the air inlet 14 may not be located in the first quadrant Q1 or the second quadrant Q2, and the air inlet 14 The center C can be located on the first reference plane S1 or in the fourth quadrant Q4, which can significantly increase the wind pressure.

Please refer to Figures 2, 3 and 4, the noise reduction structure 3 is adjacent to the air inlet 14, and the noise reduction structure 3 can be arc, rectangle or polygon, which is not limited in this creation. In this embodiment, the The noise reduction structure 3 is illustrated with an arc shape. The noise reduction structure 3 may have a groove 31 , the groove 31 may communicate with the air inlet 14 , the noise reduction structure 3 is located in the second quadrant Q2 , and the noise reduction structure 3 is recessed on the inner surface 131 of the cover plate 13 , the noise reduction structure 3 can be a depression formed by metal stamping, preferably, the noise reduction structure 3 can protrude from the outer surface 132 of the cover plate 13, that is, the noise reduction structure 3 is formed from the inside to the outside. In this way, during the process of introducing the external air flow from the air inlet 14, the sound wave of the resonance noise can be disturbed and attenuated by the noise reduction structure 3, so as to have the effect of reducing the noise. The height H at which the noise reduction structure 3 protrudes from the outer surface 132 of the cover plate 13 may be 0.3-1 mm. In addition, there may be a longest radial distance R2 between the outer edge 3a of the noise reduction structure 3 and the center C of the air inlet 14, and the ratio of the longest radial distance R2 to the curvature radius R1 is preferably 1.05-1.5.

Please refer to FIG. 5, which is the second embodiment of the cooling fan of the present invention. The second embodiment is substantially the same as the first embodiment described above, and the main difference is: the noise reduction of the second embodiment The number of structures 3 is several, for example: the noise reduction structures 3 may be two, three or several, and the shapes of the several noise reduction structures 3 may be the same or different. In this embodiment, the noise reduction structures The number of 3 is illustrated by two, the two noise reduction structures 3 are located in the second quadrant Q2, the longest radial distance R2 of the two noise reduction structures 3 can be the same, or the longest diameter of the two noise reduction structures 3 The direction distance R2 can also be different, and the total arc length of the two noise reduction structures 3 adjacent to the air inlet 14 can be 1/12-1/4 of the circumference of the air inlet 14, so that the cooling fan can be improved. The sound quality of the system has the effect of reducing noise.

Please refer to FIG. 6 , which is the third embodiment of the cooling fan of the present invention. The third embodiment is substantially the same as the above-mentioned first embodiment, and the main difference is that the third embodiment may further include at least one Auxiliary noise reduction structure 4, the auxiliary noise reduction structure 4 can be located in the second quadrant Q2, and the auxiliary noise reduction structure 4 and the noise reduction structure 3 can form a relative position or a non-opposite position. In this embodiment, the auxiliary noise reduction structure 4 The noise reduction structure 4 is selected not to be positioned on the noise reduction structure 3, that is, the auxiliary noise reduction structure 4 and the noise reduction structure 3 are staggered, so that the sound waves of the resonance noise are not at the same frequency.

In addition, the fan frame 1 can have at least one auxiliary air inlet 18, the auxiliary air inlet 18 can be opened on the base plate 11, the auxiliary noise reduction structure 4 is adjacent to the auxiliary air inlet 18 and is recessed in the inner surface 111 of the base plate 11, The auxiliary noise reduction structure 4 may have a groove 41, and the groove 41 may communicate with the auxiliary air inlet 18, that is, the auxiliary noise reduction structure 4 is formed in a convex shape from the inside to the outside. In addition, the air outlet 15 in this embodiment The number of air outlets 15 can be two, and the directions of the two air outlets 15 can be different. In this way, when the cooling fan operates, the air flow can flow into the fan frame 1 from the air inlet 14 and the auxiliary air inlet 18, and then flow out from the two air outlets 15, and the noise reduction structure 3 and the auxiliary noise reduction The arrangement of the structure 4 makes the sound wave of the resonant noise be disturbed and attenuated, so as to have the effect of reducing the noise.

Please refer to Figures 3, 7, and 8. In order to prove the above-mentioned effects, noise tests were carried out using the cooling fan of the prior art and the cooling fan of the present invention. Figure 7 shows the conventional technology without the noise reduction structure 3. The noise data graph measured by the cooling fan, Fig. 8 is the noise data graph measured by the cooling fan of the present invention with the noise reduction structure 3, under the condition that the speed of the fan wheel is the same as 4100 RPM, the heat dissipation of the conventional technology The noise measured by the fan exceeds 4dB, and the noise measured by the cooling fan of this creation is lower than 1.9dB. Therefore, the cooling fans of the embodiments of the present invention all have the effect of reducing operating noise.

To sum up, in the cooling fan of the present invention, the noise reduction structure is adjacent to the air inlet and is recessed on the inner surface of the cover plate, so that the sound waves of the resonance noise can be disturbed during the process of introducing the external airflow from the air inlet. And produce attenuation, the system can have the effect of reducing noise.

Although the present creation has been disclosed by the above-mentioned preferred embodiments, it is not intended to limit the present creation. Any person skilled in the art can make various changes and modifications relative to the above-mentioned embodiments without departing from the spirit and scope of the present creation. Therefore, the protection scope of this creation shall include all changes within the meaning and equivalent scope recorded in the appended patent application scope. In addition, when several of the above-mentioned embodiments can be combined, the present invention includes any combination of implementation aspects.

﹝This creation﹞ 1: fan frame 11: Substrate 111: inner surface 12: Side Wall 12a: top edge 13: Cover 131: inner surface 132: outer surface 14: air inlet 15: Air outlet 15a: end edge 16: Stator 17: Limiter 18: Auxiliary air inlet 2: fan wheel 21: Wheels 22: Blades 23: Spindle 3: Noise reduction structure 3a: outer edge 31: Groove 4: Auxiliary noise reduction structure 41: Groove C: Center H: height Q1: Quadrant 1 Q2: The second quadrant Q3: The third quadrant Q4: Fourth quadrant R1: radius of curvature R2: longest radial distance S1: The first reference plane S2: Second reference plane X: axis Z1: high pressure zone Z2: Strong wind zone ﹝Accustomed ﹞ 9: Cooling fan 91: Shell 911: Lower shell 912: Upper shell 913: air inlet 914: air outlet 92: Fan wheel 921: Fan blade

[Fig. 1] An exploded perspective view of a conventional cooling fan. [Figure 2] An exploded perspective view of the first embodiment of the present invention. [Figure 3] A front view of the composition of the first embodiment of the present invention. [Fig. 4] A cross-sectional view of the cover along line A-A in Fig. 3. [Figure 5] The combined front view of the second embodiment of the present invention. [Figure 6] An exploded perspective view of the third embodiment of the present invention. [Picture 7] The data graph of the noise measured by the conventional cooling fan at 4100 RPM. [Picture 8] The data graph of the noise measured by the cooling fan of this creation at 4100 RPM.

1: fan frame

12: Side Wall

13: Cover

132: outer surface

14: air inlet

15: Air outlet

15a: end edge

2: fan wheel

21: Wheels

22: Blades

3: Noise reduction structure

3a: outer edge

31: Groove

C: Center

Q1: Quadrant 1

Q2: The second quadrant

Q3: The third quadrant

Q4: Fourth quadrant

R1: radius of curvature

R2: longest radial distance

S1: The first reference plane

S2: Second reference plane

X: axis

Z1: high pressure zone

Z2: Strong wind zone

Claims (12)

A cooling fan, comprising: a fan frame with a side wall connected to a base plate, a cover plate connected to the side wall and opposite to the base plate, an air inlet located on the cover plate, the base plate, the side wall and the cover plate together forming at least one air outlet; a fan wheel rotatably disposed in the fan frame; and at least one noise reduction structure adjacent to the air inlet and recessed on the inner surface of the cover plate; Wherein, a first reference plane is parallel to the air outlet and passes through the axis of the fan wheel, a second reference plane is orthogonal to the air outlet and passes through the axis of the fan wheel, the first reference plane and the second reference plane are The reference plane divides the fan frame into a first quadrant, a second quadrant, a third quadrant and a fourth quadrant arranged counterclockwise in sequence, and the minimum radial distance between the fan wheel and the side wall is located in the The fourth quadrant, the first quadrant and the fourth quadrant form a high pressure area, the second quadrant and the third quadrant form a strong wind area and are adjacent to the air outlet, the center of the air inlet deviates from the fan in the direction of the high pressure area The axle center of the wheel, the noise reduction structure is located in the second quadrant. The cooling fan of claim 1, wherein the noise reduction structure has a groove communicating with the air inlet. The cooling fan of claim 1, wherein the noise reduction structure protrudes from the outer surface of the cover plate. The cooling fan of claim 3, wherein the height of the noise reduction structure protruding from the outer surface of the cover plate is 0.3-1 mm. The cooling fan of claim 1, wherein the center of the air inlet is not located in the first quadrant or the second quadrant. The cooling fan of claim 5, wherein the center of the air inlet is located on the first reference plane or in the fourth quadrant. The cooling fan of claim 1, wherein the number of the noise reduction structures is several, and the total arc length of the several noise reduction structures adjacent to the air inlet is 1/12-1/4 of the circumference of the air inlet. The cooling fan of claim 1, wherein the air inlet has a radius of curvature, the outer edge of the noise reduction structure and the center of the air inlet have a longest radial distance, the longest radial distance and the radius of curvature The ratio is 1.05 to 1.5. The cooling fan of claim 8, wherein the number of the noise reduction structures is several, and the longest radial distances of the several are different. The cooling fan of claim 8, wherein the number of the noise reduction structures is several, and the longest radial distances of the several are the same. The cooling fan of claim 1 further comprises at least one auxiliary noise reduction structure, the fan frame has at least one auxiliary air inlet located on the base plate, the auxiliary noise reduction structure is adjacent to the auxiliary air inlet and is recessed on the inner surface of the base plate. The cooling fan of claim 11, wherein the auxiliary noise reduction structure is not aligned with the noise reduction structure.

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