Patent Application
20070251677
The present invention relates generally to a heat dissipation apparatus, and more particularly to a heat dissipation apparatus for dissipating heat generated by electronic components, wherein the apparatus has guiding plates for guiding an airflow to flow more smoothly and evenly through a fin assembly.
Following the increase in computer processing power that has been seen in recent years, greater emphasis is now being laid on increasing the efficiency and effectiveness of heat dissipation devices. Referring to
In operation of the heat dissipation apparatus 20, the casing 222 guides the airflow to move toward an upper side 246 of the air outlet 221 of the heat-dissipating fan 22. A portion of the airflow leaves the heat-dissipating fan 22 at the upper side 246 of the air outlet 221 with another portion flowing toward a bottom side 244 of the fin assembly 24 from the upper side 246 thereof. A flow direction of the airflow flowing toward the upper side 246 of the fin assembly 24 is substantially parallel to the fins 242 thereof, while the airflow flowing toward the bottom side 244 of the fin assembly 24 forms an acute angle with each fin 242 of the bottom side 244 of the fin assembly 24. The airflow flowing toward the bottom side 244 of the fin assembly 24 may be deflected by the fins 242 thereof due to the acute angles formed therebetween. This deflection of the airflow may cause a loss in kinetic energy of the airflow. Thus speed of the airflow flowing toward the bottom side 244 of the fin assembly 24 may be reduced. The heat dissipation efficiency of the heat dissipation apparatus 20 will thereby be further reduced. Accordingly, it can be seen that the heat dissipation efficiency of the heat dissipation apparatus 20 has room for improvement.
The present invention relates to a heat dissipation apparatus for dissipating heat from a heat-generating electronic component. According to a preferred embodiment of the present invention, the heat dissipation apparatus includes a fin assembly thermally connecting with the heat-generating electronic component to absorb heat therefrom, and a heat-dissipating fan for providing an airflow flowing through the fin assembly to take heat away therefrom. The heat-dissipating fan includes a bottom housing, a top cover mounted on the bottom housing to form a space therebetween, and a motor with a plurality of blades accommodated in the space. The top cover extends a plurality of guiding plates therefrom for guiding the airflow from the blades toward the fin assembly.
Other advantages and novel features of the present invention will become more apparent from the following detailed description of preferred embodiment when taken in conjunction with the accompanying drawings, in which:
Referring to FIGS. 1 to 3, a heat dissipation apparatus 10 according to a preferred embodiment of the present invention is shown. The heat dissipation apparatus 10 includes a heat-dissipating fan 12 and an arc-shaped fin assembly 14.
The fin assembly 14 thermally connects with a heat-generating electronic component (not shown) to absorb heat therefrom. The fin assembly 14 includes a plurality of stacked fins 142. A plurality of air passages 144 is formed between two adjacent fins 142.
The heat-dissipating fan 12 is a centrifugal blower for providing an airflow with a high air pressure. The heat-dissipating fan 12 includes a casing 121, a stator (not shown) mounted in the casing 121, and a rotor including a plurality of blades 122 rotatably disposed around the stator. Referring to
The casing 121 includes a bottom housing 124 and a top cover 125 mounted on the bottom housing 124. The top cover 125 is a plate made of metallic materials such as aluminum, steel, and copper or any appropriate alloys thereof. The bottom housing 124 is made of a plastic material, and formed by injection molding.
The top cover 125 defines a through hole therein function as an air inlet 126 of the heat-dissipating fan 12. A plurality of guiding plates 127 are formed by stamping/pressing perpendicularly to and downwardly from the top cover 125 toward the bottom housing 124, thereby forming a plurality of gaps 128 on the top cover 125. A plurality of covering plates 129 are disposed on the gaps 128 of the top cover 125, so as to prevent the air flow in the casing 121 of the heat-dissipating fan 12 from escaping the heat-dissipating fan 12 via the gaps 128.
The bottom housing 124 extends a supporting portion 131 from a middle portion thereof so as to support the stator. A sidewall of the bottom housing 124 defines an arc-shaped opening therein which functions as an air outlet 132 for the heat-dissipating fan 12. The arc-shaped fin assembly 14 is mated with the air outlet 132 of the heat-dissipating fan 12. The guiding plates 127 are located between the blades 122 and the fin assembly 14, and distributed around a rotational axis A of the rotor. Referring particularly to
In the present invention, the guiding plates 127 distribute the airflow from the blades 122 evenly over the fins 142, and change the flow direction of each part of the airflow to the direction so as to be substantially parallel to the extending directions of the fins 142 adjacent to the guiding plate 127. The flow direction of the airflow reaching different parts of the fin assembly 14 is substantially parallel to the extending directions of the adjacent fins 142. So the airflow arriving at the fin assembly 14 can not be deflected by the fins 142 of the fin assembly 14. The kinetic energy loss from the airflow is thus prevented and the heat dissipation efficiency of the heat dissipation apparatus 10 is thereby increased.
In the present invention, the guiding plates 127 are stamped/pressed from the top cover 125 toward the bottom housing 124. If the guiding plates 127 were formed at the bottom housing 124, they should have been integrally formed on the bottom housing 124 by injection molding. The present invention omits the manufacture a mold for the formation of the guiding plates 127. This simplifies both the design of the mold of the bottom housing 124 and also the manufacture of the heat-dissipating fan 12. Thus, the cost of the heat-dissipating fan 12 is reduced. Moreover, through such manufacturing the guiding plates 127 may reduce the noise produced during the operation of the heat-dissipating fan 12. This noise reduction is produced because using stamping/pressing to form the guiding plates 127 allows a thinner shape than that produced by injection molding. The thinner shaped guiding plates 127 have lower airflow resistance, thereby making the airflow flow evenly through the spaces formed between adjacent guiding plates 127. Therefore, the noise produced during operation of the heat-dissipating fan 12 is reduced.
In the present invention, the air outlet 132 of the heat-dissipating fan 12 and the fin assembly 14 each have an arc-shaped configuration. Alternatively, the heat-dissipating fan may have a rectangular or circular shaped air outlet, and the fin assembly may accordingly have a correspondingly rectangular or circular shaped configuration.
It is to be understood, however, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
