TWI220914B - Heat dissipating fan - Google Patents

Abstract

A heat dissipating fan comprises a housing, a heat sink, a impeller, and a cover plat. The heat sink is extended from an outlet of the housing, and provided with a plurality of fins, a plurality of air channels, and a plurality of heat dissipating posts. A cross-sectional area of the air channels formed on an inlet of the heat sink is greater than that of the air channels formed on an outlet so as to constitute a pressure-boosting structure. Thus, the pressure-boosting structure of the air channels prevents a cooling air from direct leakage so that more heat of the fins are able to exchange with the cooling air pass therethrough.

Description

1220914 V. Description of the invention (l) • The technical field to which the invention belongs] The present invention relates to a cooling fan structure, and more particularly, to a fan housing provided with a cooling fin on the outside of an air outlet, and the cooling fin forms a plurality of air flow channels. The long airflow channel has a supercharged slow-flow structure to improve the overall heat dissipation efficiency of the cooling fan. [Previous technology] The conventional cooling fan structure is shown in FIG. 丨. A cooling fan system includes a fan housing 10, a heat sink 20, a fan wheel 30, and an upper cover 40. The fan housing 10 has a plurality of side walls 丨 丨 forming a container 丨 2 and at least ~ air outlets 13. The heat sink 20 is integrally formed on the outside of the air outlet 13 and a plurality of fins 2la are protruded to form a plurality of heat dissipation channels 2 ^. The fan wheels 30 are arranged in the container 12 and are provided with a plurality of blades 31. The upper cover 40 is disposed above the wind fin 20 and defines an air inlet 41. During the heat dissipation process, enter the fan housing 10, and then blow it radially toward the air outlet 3 side 20, so that the fins 21a and the heat dissipation channel 22a can send a heat sink piece [not shown] ] Perform heat exchange. Although the cooling fan has two thermoelectric + elementary fan housings 10 and fins 20 with a simple structure and is suitable for catching the child device, the airflow is too fast. 2 a is directly lost, so it is not possible to carry out the full airflow of seeing the Liuliu Temple ..., the father changed to Tian L-¾ to further improve the overall heat dissipation efficiency. In addition, for reading wind, and the inner wall of the chicken 11 is formed on the two sides of the air outlet i 3 on the two sides, respectively, the cooling air flow from the side of the Λ body 1 〇 can not smoothly flow into the heat sink 2 0, m 隅 1 4 ′ Its edge ^ heat dissipation efficiency. The θ shirt sounds 敎 The wheel 30 is driven by several blades 31 to drive the wind, so that the cooling air flow from the τ ′

C: \ Lo ^ o-5 \ Five Cont inents \ PK9192.ptd Page 5 1220914

V. Description of the invention (2) In view of this, the present invention improves the number of wavy or jagged shapes; | 耆 Snake airflow channels and several cooling columns The side cross-sectional area is relatively larger than the snake-shaped airflow supercharged slow-flow structure. In this way, the length of the present invention and the total heat exchange area of the fins are exchanged for time, so as to improve the shortcomings described in [Summary of the Invention] of the heat sink. The cross-sectional area of the outlet side of the serpentine airflow channel on the wind outlet side can greatly increase the total heat dissipation of the airflow channel and extend the overall heat dissipation efficiency of the airflow and fins. The main object of the present invention is to provide a heat sink on the air outlet side of the body, and the cross-sectional area on the air inlet side of the airflow channel is a cross-sectional area, so it can constitute a time for the heat-exchange between the supercharged slow flow structure and the miscellaneous piece. Effect. A secondary object of the present invention is to provide a number of wavy or jagged low-numbered channels and a plurality of heat-dissipating columns' to increase the air & total heat exchange area, and to extend the air flow and improve the heat dissipation efficiency of the present invention < The cooling fan structure of the present invention has a sheet, a fan wheel and an upper cover. On the side of the cooling air outlet, the heat sink is provided with a plurality of hot air columns, and the cross-sectional area of the air inlet side of the airflow channel is formed to form a cooling fan structure, in which the heat sink of the fan shell has several airflow channels. It is relatively larger than the airflow side of the airflow channel, and the airflow is further extended to make the present invention more efficient. The heat dissipation fan structure Γγρ- is formed on the heat sink fins to form the total heat dissipation length of several meandering airflow channels. Fin ram tamping. The time for heat exchange and efficiency of the seam. /. A fan casing and a heat sink are provided on one of the fan casings, a plurality of airflow channels and a plurality of diffused areas are relatively larger than the airflow through the supercharged slow-flow structure. So, heat dissipation

C: \ Loiio-5 \ Fi ve Cont inents \ PK9192.ptd

1220914 V. Description of the invention (3) The fan can use the supercharged slow flow structure of the air flow channel to slow down the rapid loss of air flow, so as to relatively extend the time for the air to exchange heat with the fins. [Embodiment] In order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following describes the preferred embodiments of the present invention in detail with reference to the accompanying drawings. FIG. 2 illustrates an exploded perspective view of a cooling fan structure according to the first embodiment of the present invention; FIG. 3 illustrates a schematic cross-sectional view of a flow direction of the air flow of the cooling fan structure according to the first embodiment of the present invention; An exploded perspective view of the structure of a cooling fan according to the example; FIG. 5 illustrates a schematic top view of the airflow direction of the 4th cooling fan structure of the second embodiment of the present invention; and FIG. Perspective view. The part of the heat dissipation fan structure of the present invention is the same as the conventional heat dissipation fan structure of FIG. 1, so the same parts will be marked with the same drawing number, and the structure and function will not be described in detail. Please refer to Figs. 2 and 3, the basic structure of the heat dissipation fan structure of the first embodiment of the present invention includes a fan housing 10, a heat sink 20, a fan wheel 30, and an upper cover 40. The fan casing 10 is provided with a plurality of side walls 11, a receiving chamber 12 and at least one air outlet 13; the heat sink 20 is provided outside the air outlet 13 of the fan casing 10; the fan wheel 3 0 is located in the container 12 and has several blades 3 1; ^ and the upper cover 40 is provided above the fan housing and the heat sink 20, and an air inlet 4 1 is provided. Please refer to the second and the second As shown in FIG. 3, the heat sink 20 of the heat dissipation fan structure of the first embodiment of the present invention includes a plurality of fins 21, a plurality of meandering air passages 22, and

C: \ Logo-5 \ Five Cent inents \ FK9192.ptd Page 7 1220914 V. Description of the invention (4) Heat dissipation columns 23, meanwhile, the heat sink 20 can form a pressurized slow-flow structure by changing the axial height [ Not marked]. The heat sink 20 (and the fan housing 10) is preferably made of a thermally conductive material such as copper or aluminum, and a bottom surface can be attached with a heat-generating electronic component [not shown]. The fins 21 are wavy or zigzag, which can increase the total heat exchange area of the fins 20; the meandering airflow channel 2 2 is extended between each two adjacent fins 21, and the system The total heat dissipation length of the airflow channel can be increased; the heat dissipation column 23 is arranged at a plurality of wider portions of the meandering airflow channel 22, which further increases the heat exchange area of the heat sink 20; and the pressurized slow-flow structure makes the meandering The axial height of the airflow channel 2 2 decreases from the air inlet side (that is, the air outlet 13 of the fan set 10) to the air outlet side, so that the snake is cut off by the airflow side of the airflow channel 2 2 The area is relatively small, and at the same time, the fin 21, the meandering air passage 22, and the heat dissipation column 23 have a decreasing height. As a result, it takes a long time for the airflow to pressurize through the meandering airflow channel 22, so the supercharged slow-flow structure can relatively extend the time for the airflow to perform heat exchange with the fins 21. Therefore, the present invention can indeed increase the heat exchange efficiency of the unit airflow relatively by the meandering airflow channel 2 of the heat sink 20, the heat dissipation column 23, and the supercharged slow-flow structure to increase the overall heat dissipation efficiency of the heat sink. Furthermore, as shown in FIG. 2, the first embodiment of the present invention is preferably to increase the height of the fan casing 10 relatively to form the supercharged slow-flow structure, so that the present invention can be used in the fan casing. A larger size fan fan 30 is set in the chamber 12 of the body 10, so that the larger size of the blade 31 drives more cooling airflow, so as to relatively increase the airflow flow per unit time of the cooling fan. In addition, as shown in FIG. 2, the first embodiment of the present invention may optionally shorten the length of a part of the side piece 2 3 on the side of the air outlet 1 3.

C: \ Logo-5 \ F1 vcti nen ts \ PK9192. Ptd Page 8 1220914 V. Description of the invention (5) Several air ducts 2 21 with a larger I degree, so that the airflow can be smoothed by the cooling fan 1 The air outlet 丨 3 of 0 enters the meandering air passage 22. The inner wall of the side wall 1 丨 of the fan casing 10 can be formed with a straight or round one guide surface 1 1 1 on the two sides of the air outlet 丨 3, so as to make the cooling air flow smoother. The chamber 12 flows into the air outlet 13 and the heat sink 20. Bing Yi Zailing is shown in Figures 4 and 5, which discloses the second embodiment of the present invention. Compared with the first embodiment, the heat sink 20 of the second embodiment is formed by changing the width to form a supercharged slow-flow structure [not labeled]. The vertical pressure slow flow structure makes the width of the meandering airflow channel 22 decrease from the wind inlet side (that is, the air outlet of the fan housing 10 to the wind outlet side 3) to the wind outlet side, so that the snake airflow channel 2 The cross-sectional area of the outlet side of 22 is relatively small, and at the same time, the width of the insect flow channel 22 is decreasing. Thereby, the supercharged and slow-flow structure of the second embodiment can also make the cross-sectional area of the airflow side of the meandering air passage 22 relatively small but decrease, and cause the airflow to take a long time to pressurize through the meandering air passage 22, Therefore, the heat exchange time of the airflow can also be relatively extended. a if 1 is. Furthermore, as shown in FIG. 4, the second embodiment of the present invention is preferably formed by increasing the width of the fan fan body 10 to form the supercharged slow-flow structure. The invention will be able to set a large-sized fan private 30 in the fan chamber 丨 2 of the fan housing, in order to drive more cooling airflow by the large-sized blade 31 to relatively increase the airflow flow per unit time of the cooling fan . As shown in Fig. 6 and Fig. 6, it discloses the structure of a heat sink in a third embodiment of the present invention. Compared with the first and second embodiments, the heat sink 20 of the third embodiment is optional. By changing the axial height and width at the same time to form a supercharged slow flow structure

1220914 V. Description of Invention (6) Manufacturing [Unlabeled]. The supercharged slow-flow structure makes the axial height and width of the meandering air passage 22 gradually decrease from the air inlet side (ie, the air outlet 13 of the fan casing 10 to the air outlet side) so that the The cross-sectional area on the wind-out side of the meandering air passage 22 is relatively small, and at the same time, the fins 21, the meandering air passage 22, and the cooling pillar 23 have decreasing height and width. Thereby, the supercharged and slow-flow structure of the third embodiment can relatively reduce the cross-sectional area on the wind-out side of the meandering airflow channel 22 and cause the airflow to take longer to pressurize through the meandering airflow channel 2 2. The time for heat exchange between the air flow and the fins 21 can be extended to the longest. Furthermore, as shown in FIG. 6, the third embodiment of the present invention preferably increases the height and width of the fan casing 10 relative to each other to form the supercharged and slow-flow structure. A large-sized fan wheel 30 is set in the air-conditioning housing 12 of the wind-generating casing 10, so that the large-sized blade 31 drives more cooling airflow, so as to relatively increase the airflow flow rate per unit time of the cooling fan. As described above, compared with the conventional cooling fins of FIG. 1, the fins of the conventional cooling fins flow but are too fast, and the direct flow of the airflow channel 2 2 a between the two fins is lost directly. Snake-shaped airflow channel 2 2, cooling column 23, and supercharged slow-flow structure can be used to greatly increase the total heat dissipation length, the total heat exchange area ', and extend the heat exchange time between the airflow and the slit 21 to increase the heat dissipation of the fan. Overall cooling efficiency. Although the present invention has been disclosed by the aforementioned preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. The scope of protection shall be determined by the scope of the attached patent application.

C: \ Lo〇-5 \ Fi vc Con11nents \ PK9192.ptd Page jq 1220914 Simple illustration of the drawing [Simplified illustration of the drawing] Figure 1: An exploded perspective view of the structure of a conventional cooling fan. Fig. 2 · An exploded perspective view of the structure of a heat sink in the first embodiment of the present invention. Fig. 3: A schematic cross-sectional view of the airflow direction of the cooling fan structure of the first embodiment of the present invention. Figure 4: An exploded perspective view of the structure of a cooling fan according to a second embodiment of the present invention. Fig. 5 is a schematic view of the airflow direction of the cooling fan structure according to the second embodiment of the present invention. Figure 6: An exploded perspective view of the structure of a heat sink according to a third embodiment of the present invention. Description of drawing number: 丨 10 Fan housing 11 Side wall 111 Diversion surface 12 Container 13 Air outlet 14 Corner 20 Heat sink 21 Fin 21a Binding piece 2 2 Snake air passage 2 2 a Air passage 221 Air guide 23 Heat sink 30 Fan wheel 31 Blade 40 Upper cover 41 Air inlet

C: \ Loyo-3 \ Fi ve Cxintinents \ PK9192.ptd Page 11

Claims (1)

1220914 A cooling fan structure includes: a fan casing provided with a plurality of side walls, a containing chamber, and at least one air outlet < political heat fin, which is provided on the air outlet side of the fan casing, and the heat radiating sigh There are several fins, and each two fins extend to form an air flow-迢;. Fan wheel, which is set in the container of the fan casing, and is equipped with several apples •, and Λ upper 盍, which is set Above the fan casing and the heat sink, an air inlet Π is provided; ^ The cross-sectional area of the air inlet side of the air flow passage is relatively larger than the cross-sectional area of the air outlet side of the air flow passage to form a supercharged slow flow Structure, so the cooling fan can reduce the direct loss of airflow by the supercharged slow-flow structure, so as to 'relatively extend the time for the airflow to perform heat exchange with the fins. ^ 丨 :: 2. The structure of the cooling fan according to item 丨 of the scope of the patent application, wherein the system is wavy and dentate. 3. The structure of the cooling fan according to item 2 of the scope of the patent application, wherein the airflow channel between the two slits is a meandering airflow channel. 4. The structure of the cooling fan according to item 丨 of the scope of the patent application, wherein the axial surface of the fin is gradually reduced from the air inlet side to the air outlet side, so that the cross-sectional area of the air outlet side of the airflow channel is relatively formed. Small, and constitutes the supercharged slow flow structure. 5. The cooling fan structure according to item 1 of the scope of the patent application, wherein the width of the heat sink is decreased from the air inlet side to the air outlet side so that the airflow channel 1220914 VI. Scope of patent application ′ The cross-sectional area on the air outlet side is relatively small, which constitutes the supercharged slow-flow structure. 6. The cooling fan structure according to item 1 of the scope of the patent application, wherein the height and width of the fins are reduced from the wind inlet side to the wind outlet side at the same time, so that the cross-sectional area of the air outlet side of the airflow channel is relatively formed. It is small and constitutes the supercharged slow-flow structure. 7. The structure of the cooling fan according to item 1 of the scope of the patent application, wherein when the air flow channel is provided with a plurality of cooling columns. 8. According to the structure of the cooling fan described in item 1 of the scope of the patent application, wherein a part of the fins of the heat sink is shortened by 4 lengths near the air outlet of the fan casing to form a plurality of air guides having a larger width, The airflow can enter the airflow channel from the air outlet of the cooling fan smoothly. 9. The structure of the cooling fan according to item 1 of the scope of the patent application, wherein the inner wall of the side wall of the fan casing is formed with a guide surface on each side of the air outlet position. C: \ Lo ^ o-5 \ Fi ve Cont inents \ PK9192.ptd Page 13