TWI426181B - Fan cooling system and electronic device using the system - Google Patents

Description

Fan cooling system and electronic device using the same

The present invention relates to a fan heat dissipation system and an electronic device using the same.

In order to prevent noise hazards, the industry has established strict sound quality specifications to regulate the sound quality of various products. In the specification, Loudness, Tonality, Modulations Strength, etc. are important indicators.

In electronic devices, such as computers, fans are usually installed to meet the need for heat dissipation. The fan will cause air to flow to achieve heat dissipation, but it will also generate aerodynamic noise that can adversely affect the human body. Among them, the variable noise intensity is the main indicator affecting the aerodynamic noise.

In view of the above, it is necessary to provide a fan cooling system that can attenuate aerodynamic noise.

An electronic device includes a base, a fan mounted in the base, an airflow guide cover, and a top plate covering the base, the base includes a bottom plate opposite to the top plate, and the bottom plate The opposite ends extend to a front panel and a rear panel of the top panel, the front panel defines a system air inlet, and the rear panel defines a system air outlet, the wind The fan includes a fan air inlet opening toward the air inlet of the system and a fan air outlet facing the air outlet of the system, the top plate is adjacent to the fan air outlet to open a sound reduction air outlet, the air flow guide is located at the fan air outlet and the system Between the air outlets, and one end of the airflow guide is adjacent to the air outlet of the fan, the airflow guide includes a top plate, and a recess of the top of the airflow guide that abuts the air outlet of the fan defines a recess.

The setting of the sound reduction air outlet can reduce the pressure gradient change at the fan air outlet, thereby achieving the purpose of reducing the aerodynamic noise.

10, 10A, 10B‧‧‧ electronic devices

20‧‧‧ Shell

70, 70B‧‧‧ fan

30‧‧‧Base

50, 50A, 50B, 91B‧‧‧ top board

31, 31A, 31B‧‧‧ bottom plate

33‧‧‧ side panels

35‧‧‧ front board

37‧‧‧ Back panel

370‧‧‧System inlet

350, 350B‧‧‧ system air outlet

310, 500, 500A, 500B‧‧‧ reduction sound outlet

311, 501‧‧‧through holes

71‧‧‧fan inlet

73‧‧‧fan outlet

90B‧‧‧air guide

910B‧‧‧ Groove

1 is a perspective view of a first embodiment of an electronic device of the present invention.

2 is an exploded perspective view of the electronic device of FIG. 1.

3 is an exploded perspective view of a second embodiment of the electronic device of the present invention.

4 is an exploded perspective view of a third embodiment of the electronic device of the present invention.

Referring to FIG. 1 and FIG. 2, in the first embodiment of the present invention, the electronic device 10 includes a casing 20 and three fans 70 mounted in the casing 20.

The outer casing 20 includes a base 30 and a top plate 50 that covers the base 30. The base 30 includes a bottom plate 31, two side plates 33 extending vertically upward from opposite sides of the bottom plate 31, and a front plate 35 and a rear plate 37 extending vertically upward from opposite ends of the bottom plate 31, respectively. A plurality of vent holes are formed in the rear plate 37 to form a system air inlet 370. A plurality of vent holes are formed in the front plate 35 to form a system air outlet 350. Three sound-reducing air outlets 310 are provided on the bottom plate 31. Each of the sound-reducing air outlets 310 includes five circular through holes 311 opened in the bottom plate 31. The through holes 311 are arranged in a "one" shape, and the arrangement direction is parallel to the front plate 35. And the rear plate 37. The top plate 50 is disposed opposite to the bottom plate 31. Three sound reduction air outlets 500 are provided on the top plate 50. Each of the sound-reducing air outlets 500 includes five circular through holes 501 arranged in a "one" shape. When the top plate 50 is closed to the base 30, the orthographic projections of the sound-reducing air outlets 500 on the bottom plate 31 respectively coincide with the sound-reducing air outlets 310.

The fans 70 are mounted side by side in the base 30. Each fan 70 includes a fan air inlet 71 and a fan air outlet 73 disposed opposite each other. When the fan 70 is installed, the fan 70 is located between the sound-reducing air outlet 310 and the system air inlet 370, the fan air inlet 71 faces the system air inlet 370, the fan air outlet 73 faces the system air outlet 350, and the fan air outlet 73 of the fan 70 respectively The sound vents 310 are adjacent to each other.

After the electronic device 10 is assembled, the fan 70 is operated during use. The fan 70 allows airflow from the system air inlet 370 into the electronic device 10. The airflow flows parallel to the bottom plate 31 and flows through the fan air inlet 71 and the fan air outlet 73 in sequence, and then flows out of the electronic device 10 from the system air outlet 350. During this process, a small portion of the airflow exits the electronic device 10 in a direction perpendicular to the bottom plate 31 by the sound-reducing air outlets 310, 500.

Since the fan 70 is operated, a pressure gradient is generated in the electronic device 10, and the pressure gradient is gradually changed from the system air inlet 370 to the system air outlet 350. Air flows in a decreasing direction of the gas pressure gradient to produce the gas stream. Among them, the pressure gradient at the fan air outlet 73 changes the most, which is the main cause of aerodynamic noise. Therefore, after the electronic device 10 is provided with the sound-reducing air outlets 310 and 500, the airflow portion at the fan air outlet 73 can be released to the outside of the electronic device 10 to reduce the pressure gradient change at the fan air outlet 73, thereby attenuating the aerodynamic noise. .

It should be noted that, in other embodiments, the number of fans 70 may be according to actual needs. To make adjustments. In addition, the form, number, and arrangement of the through holes 311 and 501 of the sound-reducing air outlets 310 and 500 can also be adjusted according to actual needs.

As shown in FIG. 3, the electronic device 10A according to the second embodiment of the present invention. The electronic device 10A differs from the electronic device 10 in that the electronic device 10A is not provided with a sound-reducing air outlet on its bottom plate 31A, and only the sound-reducing air outlet 500A is provided on the top plate 50A thereof. It is easily conceivable that in other embodiments, a sound-reducing air outlet may be provided on the bottom plate 31A without providing a sound-reducing air outlet on the top plate 50A.

As shown in FIG. 4, the electronic device 10B according to the third embodiment of the present invention. The electronic device 10B differs from the electronic device 10A in that the electronic device 10B is provided with an air flow guide 90B attached to the bottom plate 31B to divert air flow, thereby further enhancing the heat dissipation effect. When the airflow guide 90B is installed, the airflow guide 90B is located between the air outlet of the fan 70B and the system air outlet 350B, and one end of the airflow guide 90B abuts the air outlet of the fan 70B to guide the airflow from the air outlet of the fan 70B to the system. Air outlet 350B. In order to make the sound-reducing air outlet 500B on the top plate 50B function, the air flow guide 90B correspondingly defines a groove 910B at an end of the top plate 91B adjacent to the fan 70B, so that the airflow can partially flow out of the sound-reducing air outlet 500B via the groove 910B. .

It has been verified that the setting of the sound-reducing air outlets 310, 500, 500A, and 500B can reduce the variable noise intensity (the variation noise intensity is the ratio of the variable noise to the stable noise in units of %) by about 9% on average. This weakens the influence of the aerodynamic noise, and the sound quality of the electronic devices 10, 10A, 10B is greatly improved.

In addition, the settings of the sound-reducing air outlets 310, 500, 500A, and 500B can also reduce the loudness by about 2.2 decibels (dB), and reduce the pitch by about 0.03 pitch units ( Tonality unit, Tu). This results in a further improvement in the sound quality of the electronic devices 10, 10A, 10B.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims.

10‧‧‧Electronic devices

30‧‧‧Base

50‧‧‧ top board

370‧‧‧System inlet

350‧‧‧ system air outlet

500‧‧‧Attenuation outlet

Claims (4)

An electronic device includes a base, a fan mounted in the base, an airflow guide cover, and a top plate covering the base, the base includes a bottom plate opposite to the top plate, and the bottom plate The opposite ends extend to a front panel and a rear panel of the top panel. The front panel defines a system air inlet, the rear panel defines a system air outlet, and the fan includes a fan air inlet opening toward the air inlet of the system. a fan air outlet facing the air outlet of the system, the top plate adjacent to the fan air outlet opening a sound reduction air outlet, the air flow guide is located between the fan air outlet and the system air outlet, and the air flow guide is adjacent to the air outlet The fan air outlet includes a top plate, and a recess of the top surface of the air flow guide adjacent to the air outlet of the fan defines a recess. The electronic device of claim 1, wherein the sound reduction air outlet comprises a plurality of through holes arranged in a "one" shape on the top plate, the through holes are arranged in a direction parallel to the front plate and the rear board. The electronic device of claim 2, wherein the fan is located between the air inlet of the system and the sound reduction air outlet. The electronic device of claim 3, wherein the bottom plate also defines a sound-reducing air outlet, and the sound-reducing air outlet of the bottom plate is opposite to the sound-reducing air outlet of the top plate.