CN1716154A - Cooling module with sound dampening function - Google Patents

Abstract

A heat radiation module with noise reduction function comprises a heat radiation fin module and a centrifugal fan. The air flow output by the centrifugal fan is sent to the heat dissipation fin module for removing the heat on the fins. The centrifugal fan comprises centrifugal fan blades fixed on a rotor of a motor. The fan housing fixes the motor and the centrifugal fan blades therein. The heat radiation fin module comprises a heat radiation fin close to the heat radiation target and a heat radiation flow channel shell, wherein the heat radiation fin and the heat radiation target are fixed in the heat radiation flow channel shell. The inner wall of the flow passage is provided with a concave-convex structure with a silencing function.

Description

Cooling module with sound dampening function

technical field

The invention relates to a heat dissipation module, in particular to a heat dissipation module with a sound attenuation function.

Background technique

As the computer responds to the market demand for thinner computers, it is no longer possible to reserve enough natural convection space inside the notebook computer casing for the space required by the heat dissipation design. Especially in high-frequency components (such as central processing unit and graphics chip), it has already faced a considerable bottleneck in the execution of heat dissipation design. Therefore, using a centrifugal fan to generate forced convection heat dissipation has become the main structure of the notebook computer heat dissipation mechanism.

Centrifugal fan 10 utilizes the flow path design (as shown in Figure 1 ) of the curved surface of the volute casing to gradually expand. The characteristics of high flow resistance in the internal system. However, the vortex (vortex) caused by the friction between the air 18 and the casing 12 and other mechanical components in the flow channel 14, and the wake (wake flow) caused by the air driven by the centrifugal fan blade 16 after passing through the volute flow channel 14, will Narrow-band noise that produces specific high frequencies. In addition, when the noise wave passes through the cooling fins 22 on the heating element 20 along with the airflow generated by the centrifugal fan 10 , a higher frequency noise spectrum will also be generated due to the friction between the fluid and the cooling fins 22 .

Once the heat dissipation performance needs to be improved, the air volume (wind speed) must be increased. However, the increase of the flow field will make the wake turbulence generated by the fan more intense, thus creating a bottleneck that is difficult to choose between noise and heat dissipation. How to solve this dilemma has become an upcoming challenge for notebook computer manufacturers.

Contents of the invention

Therefore, the object of the present invention is to provide a heat dissipation module with a noise reduction function to reduce the noise caused by excessive airflow.

According to the above purpose of the present invention, a heat dissipation module with noise reduction function is proposed. This includes a cooling fin module and a centrifugal fan. The airflow output by the centrifugal fan is sent to the cooling fin module to remove the heat on the fin. The centrifugal fan includes centrifugal fan blades fixed on the rotor of a motor. The fan housing fixes the motor and the centrifugal fan blades inside. The heat dissipation fin module includes a heat dissipation fin adjacent to the heat dissipation object, and a heat dissipation flow channel shell, in which the heat dissipation fin and the heat dissipation object are fixed. The inner wall of the flow channel has a concave-convex structure with a sound-absorbing function.

From the above, it can be known that the application of the heat dissipation module with noise reduction function of the present invention can not only reduce the amplitude of the noise, but also reduce the degree of uneven distribution of the wake after the impact. In other words, the flow field is stabilized to obtain a wider frequency distribution (Hay-stack) of noise, allowing users to feel better sound quality.

Description of drawings

FIG. 1 is a schematic diagram of an existing heat dissipation module;

Fig. 2 is a schematic diagram of a heat dissipation module with noise reduction function according to a preferred embodiment of the present invention;

Fig. 2 A is a sectional view of a heat dissipation channel with a noise reduction function according to a preferred embodiment of the present invention;

FIG. 2B is a schematic diagram of the inner wall of a heat dissipation channel housing with a sound-absorbing function in a preferred embodiment of the present invention; and

3A-3D are detailed structural diagrams of a heat dissipation channel with a sound-absorbing function according to a preferred embodiment of the present invention.

Detailed ways

In order to solve the dilemma of noise and heat dissipation, the present invention proposes a heat dissipation module with a noise reduction function. In the present invention, an uneven structure is designed in the flow channel of the heat dissipation module (for example, the heat dissipation module of heat dissipation fins) to reduce noise.

Please refer to FIG. 2 , which shows a schematic diagram of a heat dissipation module with noise reduction function according to a preferred embodiment of the present invention. This embodiment includes a centrifugal fan 100 and a cooling fin module 110 . The centrifugal fan 100 has a centrifugal blade 103 . The motor (not shown) in the centrifugal fan 100 drives the centrifugal fan blade 103 , so that air is taken in through the air inlet 102 , passes through the volute channel 105 in the fan, and finally exits through the air outlet 104 . Due to the friction between the fluid and the tube wall in the spiral channel 105, the airflow 106 contains many specific high-frequency narrow-band noises. The heat dissipation fin module 110 is usually fixed adjacent to a heat generating component 120 (heat dissipation target), so that the heat generated by the heat generating component 120 is conducted to the heat dissipation fin 112 . The heat dissipation fin module 110 is composed of fins 112 and a heat dissipation flow channel housing 116 . There are fixing fins 117 a / 117 b on both sides of the cooling channel housing 116 , and the fins include fixing holes 119 which can be locked by screws. The cooling fin module 110 has an air inlet 108 for receiving the airflow 106 from the centrifugal fan 100 . The airflow 106 flows through the cooling fins 112 , takes away the heat on the cooling fins 112 , and is blown out by the air outlet 118 .

Please refer to FIG. 2A , which shows a cross-sectional view of a heat dissipation channel with a noise reduction function according to another preferred embodiment of the present invention. This figure is a cross-sectional view of the cooling runner cut from the section line A-A in Figure 2. In this preferred embodiment, many concave-convex structures 122 are designed in the channel 113 of the cooling fin module 110 . This concave-convex structure can be set on the side inner wall of the flow channel 113 or the inner wall of the upper cover, so that the entire flow channel 113 has a geometric structure similar to a silencer, which can not only reduce the structural radiated sound produced by the fluid hitting the inner wall of the flow channel, but also reduce the impact on the inner wall of the flow channel. Noise waves produce effects such as absorption or interference. The above-mentioned concave-convex structure may be provided on the inner wall of the flow channel of the air outlet 104 . The concave-convex structure needs to be designed in a small size to avoid increasing the flow resistance too much. This concavo-convex structure has a great effect on reducing high-frequency noise, and its maximum attenuation is related to the cross-sectional area of the flow channel. When designing a general flow channel, the cross-sectional diameter D of the flow channel is about 0.5 to 1.0 times the wavelength of the attenuated noise (see Figure 2A).

Referring to FIG. 2B , it shows a schematic diagram of an inner wall of a heat dissipation channel housing with a sound-absorbing function according to a preferred embodiment of the present invention. The concavo-convex structure 122 in the heat dissipation channel makes the entire channel have a geometric structure similar to that of a muffler, which can not only reduce the structural radiated sound produced by the fluid hitting the inner wall of the channel, but also absorb or interfere with noise waves. The heat dissipation channel housing 116 is fixed on the heat dissipation fin module 110 by screw locking through the fixing holes 119 on the fixing fins 117a/117b.

Referring to FIGS. 3A-3D , which illustrate a detailed structural view of a heat dissipation channel with a sound-absorbing function according to a preferred embodiment of the present invention (enlarged part 124 in FIG. 2B ). In FIG. 3A , a circular protruding structure with sound-absorbing function is shown. In FIG. 3B , a circular concave structure with sound-absorbing function is shown. In FIG. 3C , a square protruding structure with sound-absorbing function is shown. In FIG. 3D , a square concave structure with sound-absorbing function is shown.

It can be seen from the above preferred embodiments of the present invention that the application of the heat dissipation module with noise reduction function of the present invention can not only reduce the amplitude of the noise, but also reduce the degree of uneven distribution of the wake after the impact. In other words, the present invention can stabilize the flow field, obtain a wider frequency distribution (Hay-stack) of noise, and allow users to feel better sound quality.

Although the present invention has been disclosed in conjunction with the above preferred embodiment, it is not intended to limit the present invention. Any skilled person may make various modifications and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be defined by the claims.

Claims (8)

1. A cooling module with noise reduction function, comprising at least: a heat dissipation fin fixed adjacent to a heat dissipation target; and A radiating flow channel casing covering the radiating fins, wherein the radiating flow path casing at least includes: an air inlet for receiving airflow from a centrifugal fan; an air outlet; and A plurality of flow channel inner walls, including one side inner wall and an upper cover inner wall; and A plurality of concave-convex structures are arranged on the side inner wall or the inner wall of the upper cover. 2. The heat dissipation module according to claim 1, wherein the concave-convex structure comprises a circular, square, triangular or polygonal structure. 3. The heat dissipation module according to claim 1, wherein the cross-sectional diameter of the heat dissipation channel is 0.5-1.0 times the noise wavelength. 4. The heat dissipation module according to claim 1, wherein a size of the concave-convex structure is much smaller than a cross-sectional diameter of the heat dissipation channel. 5. A cooling module with noise reduction function, comprising at least: a heat dissipation fin fixed adjacent to a heat dissipation target; A heat dissipation flow channel casing, covering the heat dissipation fins therein, wherein the heat dissipation flow path casing includes a first air inlet, a first air outlet, and an inner wall of the flow channel, and the inner wall of the flow channel has a concave-convex structure with a sound-absorbing function; a centrifugal fan blade corresponding to the first air inlet; and A casing encloses the centrifugal fan blade, the casing at least includes: a second air inlet, located in the axial direction of the centrifugal fan blade; a second air outlet, located in the radial direction of the centrifugal fan blade, wherein the air driven by the centrifugal fan blade flows to the first air inlet through the second air outlet; and A concavo-convex structure is located on the inner wall of the second air outlet part of the casing to eliminate the noise generated by the centrifugal fan. 6. The heat dissipation module according to claim 5, wherein the cross-sectional diameter of the second air outlet is 0.5-1.0 times the noise wavelength. 7. The heat dissipation module according to claim 5, wherein a size of the concave-convex structure is much smaller than a cross-sectional diameter of the heat dissipation channel. 8. The heat dissipation module according to claim 5, wherein the cross-sectional diameter of the heat dissipation channel is 0.5-1.0 times the noise wavelength.

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