TW200539791A - Dissipation module with noise reduction function - Google Patents

Abstract

A dissipation device includes a dissipation fin set and a centrifugal fan. The centrifugal fan outputs airflow toward the dissipation fin set to remove the heat from it. The centrifugal fan includes a centrifugal impeller mounted on a motor. An outer housing houses the motor and the centrifugal impeller therein. An inner wall of the housing's outlet has feathered structure to reduce noises. The dissipation fin set includes a fin structure adjacent to a heat source, as well as an airflow channel housing. The airflow channel includes featured structures for reducing noises.

Description

200539791 V. Description of the invention (1) '^^^ ~ [Technical field to which the invention belongs] The present invention relates to a heat dissipation module', and in particular to a heat dissipation module with a noise reduction function for a computer. [Previous Technology] As the computer responds to the thinning market demand, sufficient natural convection space cannot be reserved inside the notebook computer case for the structure required for heat dissipation design. Especially in high-frequency components (such as central processing units and graphics chips), they have faced bottlenecks in the implementation of considerable thermal design. Therefore, using a centrifugal fan

The generation of forced convection cooling methods is already the main structure of the cooling mechanism of notebook computers. = The heart-shaped fan 100 is designed with a gradually expanding flow channel on the curved surface of the pot-shaped shell (shown in Figure 1). The centrifugal fan blade 103 converts the kinetic energy of the gas into pressure energy to pay for a better static pressure. Overcome high flow resistance in notebook computer systems. The surface of the air driven by the centrifugal fan blade 103 through the snail-shaped flow channel (Wake flow), and the vortex caused by the friction between the air and the French components, will produce machine sounds such as the shell. When this noise wave is generated with the narrow frequency of the high frequency generated by the centrifugal fan, it will also be caused by the 麾 of the fluid and the pipe wall of the flow channel, and the ’'through the cooling mode. Thick wipe ’to produce higher frequency noise

Once it is necessary to improve the cooling efficiency, it is necessary to steal the increase of the flow field, which will cause the fan to generate ^ S (wind speed). However, the intractable disturbances on the issue of noise and heat dissipation are even more severe, which has caused the environment to become a problem for notebook computer manufacturers: how to solve this dilemma?

200539791 V. Description of the invention (2) [Summary of the invention] Therefore, the object of the present invention is to provide a heat dissipation module with a noise reduction function to reduce noise caused by excessive airflow. Wu According to the above-mentioned object of the present invention, a group having a muffler function is proposed. This cooling module includes a cooling Korean chip module and a centrifugal wind: two output air ★ ’are sent to the cooling wrong chip module for transferring the heat. Centrifugal fan, eclipse I belongs to a centrifugal fan blade, which is fixed on a rotor. The fan housing is fixed & Ganh Motor's air outlet Qiu Zhipi is inside and the ancient main motor centrifugal fan blade is inside. The outer / hairy structure of the outer shell is used to eliminate the fins and ΐ 'generated by the centrifugal wind genus and including-the heat radiating fins adjacent to the heat sink. The flow path UlL5i shell, ® sets the heat sink fins and heat sinks to a hair-like structure with a 4-, 4-tone function. -诘 f Uses the heat dissipation module with noise reduction function of the present invention, in addition to reducing the amplitude of the noise by the moon dagger, the j degree is reduced. In other words, eclipse can also make the wake distribution uneven after the impact—stabilize the flow field and get a wider frequency distribution. IHay-stack's peak standing system 9 allows users to feel better sound quality. [Embodiment] In order to solve the scattered wall of the noise function, the first function is designed. There are two thermal modules for sound and cooling. The problem of the hairy knot described in this kind of fine hair is difficult. The invention invented the structure to make it possible to apply a class-like muffler inside the air outlet.

The invention proposes that the centrifugal wind belongs to the wind D generated in other scattered

Page 8 200539791 5. In the description of the invention (3), for example, the heat dissipation module of the heat dissipation fins can reduce the noise. Please refer to FIG. 2 ', which illustrates a schematic view of a centrifugal fan with a noise reduction function according to a preferred embodiment of the present invention. The centrifugal fan 2000 has a centrifugal fan blade 203. The motor (not edged out) in the centrifugal fan 200 drives the centrifugal fan blade 203, so that air is drawn in through the air inlet 2 02, passes through the worm-shaped flow channel 2 0 1 in the fan, and finally by the air outlet 2 0 4 out of gas. Due to the friction between the fluid in the volute channel 20 and the tube wall 20 5, the air flow 20 6 contains many narrow-frequency noises of a specific high frequency. In order to eliminate the above-mentioned narrow-frequency noise at a high frequency, in the preferred embodiment, a hair-like structure 2 2 2 a is designed on the inner wall 2 0 7 of the flow passage 204 of the air outlet. This hair-like starting structure produces a muffler-like geometric structure throughout the flow channel, which not only makes the flow velocity of the fluid near the inner wall of the flow channel 2 0 7 smoother, but also reduces the structural radiation generated by the fluid hitting the inner wall 2 7 of the flow channel. . Moreover, the hair-like structure 2 2 2 a can absorb or interfere with sound waves equivalently. This hair-like structure needs to maintain a small size, and it is a principle to avoid increasing excessive flow resistance. The hair-like structure can be fixed on the inner wall of the flow channel in a mixed manner. Referring to FIG. 3, a schematic diagram of a heat dissipation module with a noise reduction function according to another preferred embodiment of the present invention is shown. And referring to FIG. 3A, it shows a cross-sectional view of a heat dissipation channel according to FIG. 3 of the present invention. The above-mentioned hairy structure & can be designed not only in the outlet end of the centrifugal fan 204, but also in the cooling module flow channel 211. This embodiment includes a centrifugal wind # 2 ^ ~ cooling fin module 21. Referring to FIG. 3A, the heat dissipation fin module stage ^ ^: fixed next to a heating element 220 (a heat sink object), so that the heat conduction generated by the hairpin $ 220 heat dissipation fin. The radiating fin module 2 10 is formed by " 2 1 2 and the radiating channel housing 2 1 6. Cooling runner housing 2 1 6 two

200539791 V. Description of the invention (4) ^ There are fixing fins 217 on the side, and the fins include fixing holes 219, which can be fixed by screws. The cooling fin module 21 0 has an air inlet 208 for receiving an air current 206 from a centrifugal fan 200. The air current 2 0 6 flows through the heat dissipation fins 2 1 2 and takes away the heat on the heat dissipation fins 2 1 2 and blows them out through the air outlet 2 1 8. The preferred embodiment is designed in the air outlet 2 0 4 of the centrifugal fan 2000, the inner wall 2 0 7 and the flow channel 2 11 of the heat dissipation fin module 2 1 0, and a hair-like structure 2 2 2 a / 2 is designed. 2 2 b. This hair-like structure makes the entire flow channel a geometric structure similar to a muffler, which not only makes the flow velocity of the fluid close to the inner wall of the flow channel smoother, but also reduces the structural radiation generated by the fluid hitting the inner wall of the flow channel. In addition, the hairy structure can effectively absorb or interfere with noise waves. This wool-like structure needs to maintain a small size design to avoid increasing excessive flow resistance as a principle. The hair-like structure can be fixed to the inner wall of the flow channel in a dry manner. This hairy structure has a large reduction effect for high frequencies. Its maximum attenuation is related to the cross-sectional area of the flow channel.] When the flow channel is designed, the cross-sectional diameter D / d of the flow channel ranges from 0.5 to -1. 〇 times. In addition, hairy structures do not require regular hairy structure arrangements or equally spaced hairy structures. The hair length, density, and softness of the hairy structure all have an effect on the effectiveness of sound attenuation. It can be known from the above-mentioned preferred embodiments of the present invention that, in addition to reducing the amplitude of noise, the heat-dissipating module having a sound-absorbing function of the present invention can also reduce the degree of uneven distribution of the wake after impact. In other words, the flow field is stabilized, and a wider-band noise (Hay-stack) is obtained, so that the user feels better sound quality. Although the present invention has been disclosed as above with a preferred embodiment, it is not intended to be limited thereto.

Page 10 200539791 V. Description of the invention (5) Anyone skilled in the art can make various modifications and retouching without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention shall be attached as follows The scope of the patent application shall prevail.

Page 11 200539791 Brief description of the drawings [Simplified illustration of the drawings] In order to make the present invention more obvious, +, and other purposes, features, and advantages can be more clearly understood as follows: Niuyi Preferred Embodiment In conjunction with the attached drawings, the detailed description is shown in Figure 1. Figure 1 shows a borrowed feather _ m Figure 2. Pant Ling-a separate arc fan schematic diagram; jealous cone, ^ 々 不 ΓΤ, photocopy A schematic diagram of a centrifugal fan with a noise reduction function according to a preferred embodiment of the invention; FIG. 3 is a schematic diagram of a heat dissipation module with a noise reduction function according to another preferred embodiment of the present invention; A cross-sectional view of a heat-dissipating flow channel with a sound-absorbing function according to another preferred embodiment of the present invention. [Single description] [Representative symbols for components 1 0 0 · • Centrifugal fan 103 · Centrifugal fan blade 1 0 6: Airflow 20 2: Air inlet 2 0 4: Air outlet 2 0 8: Air inlet 2 1 2: Heat fin Sheet 117: Fixed fin 2 1 9: Fixing hole 2 2 0: Heating element D / d: Cross section diameter of flow channel 1 0 2: Air inlet 1 04: Air outlet 2 0 0: Centrifugal fan 2 0 3: Centrifugal display Fan blade 2 0 6: Airflow 2 1 0: Radiating fin module 2 1 6: Radiating runner housing 2 1 8: Air outlet 222a / 222b: Hairy structure

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Claims (1)

200539791 VI. Scope of patent application 1. A centrifugal fan with noise reduction function, at least comprising: a centrifugal fan blade; and a casing covering the centrifugal fan blade, the casing at least includes: an air inlet, It is located in the axial direction of the centrifugal fan blade; an air outlet is located in the radial direction of the centrifugal fan blade; and a hair-like structure is located on the inner wall of the air outlet portion of the casing to eliminate the noise generated by the centrifugal fan. 2. The centrifugal fan according to item 1 of the scope of patent application, wherein the cross-sectional diameter range of the flow channel of the air outlet is 0.5 to 1.0 times the noise wavelength. 3. The centrifugal fan according to item 1 of the patent application scope, wherein the wool-like structure is made of nylon or rayon. 4. The centrifugal fan according to item 1 of the scope of patent application, wherein the hair-like structure is fixed to the inner wall of the air outlet portion of the casing by an adhesive method. 5. The centrifugal fan according to item 1 of the scope of the patent application, wherein the hair length, density, or softness of the hair-like structure is a factor that affects noise reduction. 6. —A heat dissipation module with a noise reduction function, including at least: a heat dissipation fin fixedly adjacent to a heat dissipation target; a heat dissipation runner shell holding the heat dissipation fin and the heat dissipation target therein, wherein the heat dissipation The flow channel housing includes a first air inlet, a first air outlet, and a hair-like structure with a sound-absorbing function on the inner wall of the flow channel; and Page 13 200539791 6. The scope of patent application A fan casing surrounds a centrifugal fan blade and is located at the first air inlet. The casing includes at least: a second air inlet located at the centrifugal fan blade. Axially; 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 hair-like structure located at the The inner wall of the air outlet of the shell is used to eliminate the noise generated by the centrifugal fan. 7. The heat dissipation module according to item 6 of the scope of patent application, wherein the cross-sectional diameter range of the flow path of the second air outlet is 0.5-1. 0 times the wavelength of σ 喿 sound. 8. The heat dissipation module according to item 6 of the scope of patent application, wherein the cross-sectional diameter range of the heat dissipation channel is 0.5-1. 0 times the noise wavelength. 9. The heat dissipation module according to item 6 of the scope of patent application, wherein the wool-like structure is made of nylon or rayon. 10. The heat dissipation module according to item 6 of the scope of patent application, wherein the hair-like structure is fixed to an inner wall of an air outlet portion of the casing by an adhesive method. 11. The heat dissipation module according to item 6 of the scope of patent application, wherein the hair length, density, or softness of the hair-like structure is a factor that affects the noise reduction. Page 14