TWI326406B - - Google Patents

Description

1^26406. Nine, the invention description: [Technical field to which the invention pertains] The invention S relates to a blade device, and particularly refers to a blade device for a heat dissipation wind fan. [Prior Art] The application range of the cooling fan is wide. For electronic instruments, industrial products, and even the hot CPUs in recent years, we can see the extended application of the cooling air _ ^. Generally speaking, the cooling fan can be roughly divided into an axial flow type and a centrifugal type by the direction of the air flow, wherein the air flow direction of the axial flow fan flows along the fan axis direction of the fan, that is, the vertical direction. The wind exits in the direction of the turning direction of the blade, and the airflow direction of the centrifugal fan is the radial wind along the rotating surface of the blade. As shown in FIG. 1, a conventional centrifugal fan includes a wheel 1 (), a base wall u, and a plurality of upright blades 12 disposed on the base wall. Each of the vanes 12 has a flow guiding surface (2), and the operating principle is to guide the axial airflow, and the airflow is directed to the radial direction of the hub 1 through the flow guiding surface 121 of the vane 12. When the cooling fan is in operation, the air is sucked to form oxygen "IL from the axial direction, and the airflow rebounds after hitting the base wall 1 and then the airflow is guided by the blade 12 to radially discharge the airflow. When the base wall 11 rebounds, the wind pressure and the air volume are greatly attenuated, and since the flow guiding surface 121 of the blade 12 is restricted by the windward area, the air flow rate of the guide vane 12 cannot be increased, resulting in the overall wind pressure. The air volume cannot be effectively improved. 1326406

As described above, the conventional centrifugal fan is attenuated by the collision of the airflow in the axial direction of the guide surface 121 of the blade 12, and the windward area is limited, so that the wind pressure and the air volume cannot be increased, resulting in heat dissipation. The effect is greatly reduced. In general, the heat dissipation performance can be increased by increasing the rotational speed to increase the wind pressure and the air volume. However, due to the rapid rotation of the blade 12, the blade 12 is also vibrated and the air turbulence is increased. Produces a large wind cut.

Therefore, how to increase the wind pressure and air volume on the one hand to improve the heat dissipation effect, on the other hand, it can avoid the turbulence and noise caused by the increase of the rotational speed, which is the goal that the fan manufacturing industry needs to study and develop. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a fan blade device for a heat dissipating fan, by which the fan blade device can be designed to effectively increase the wind pressure of the fan and not to invent the fan blade device of the cooling fan. a base wall including a hub, a peripheral wall of the valley, and a peripheral wall extending outwardly at an equidistant interval: a first fan f disposed on a top surface of the base wall, and a plurality of spaced apart ° is again placed in the second leaf between each two adjacent first leaves. The wheel includes a top wall, and the __ wall is only empty and a scoop extending downward from the periphery of the top wall, and the first fan blade is spaced apart from the peripheral wall of the hub, and each of the first blades is from the outer periphery of the base wall. The first main wing portion extending toward the peripheral wall of the hub, and the first main wing portion extending toward the peripheral wall of the hub: a dream. The first aileron is substantially in the form of a sheet near the peripheral wall of the hub, and the first 5 is an AR θ-Λ-wing. The cymbal has a first bend 1326406 segment that is offset from the top surface of the first main wing portion, the first curved segment extending in a direction away from the base wall. The plurality of second blades are spaced from the peripheral wall of the hub, and each of the second blades includes a second main wing extending from the outer periphery of the base wall toward the peripheral wall of the valley.

The first aileron portion of the first blade of the present invention is substantially in the form of a sheet, and when the air is drawn into the axial direction, the sheet-like design is guided by a larger vertical windward area than the conventional one. The airflow causes the wind pressure and the air volume to increase due to the increase of the windward area. In addition, the curvature of the first aileron is slaved to the top surface of the first main wing and extends away from the base wall. It can effectively increase the wind resistance and thus increase the wind pressure. The above and other technical contents, features and effects of the present invention will be apparent from the following detailed description of the preferred embodiments of the drawings.

Before the present invention is described in detail, it is noted that in the following description, like elements are denoted by the same reference numerals. 2, the rim 2, a base wall 3 of the fan device of the cooling fan of the present invention are disposed at a plurality of equally spaced intervals: 4 first blades 4, most of which are spaced apart The second blade 5 between the second fan blades 4, and the surrounding member 6. The volute 2 extends from the peripheral wall 22 of the red s g* downwardly from the periphery of the top wall 21. The base wall 3 is extended from the circumference of the circumference (four) 2 of the trough 2

The first blade 4 is spaced from the peripheral wall 22 of the hub 2 1326406

A blade 4 includes a first main wing portion 41 extending from the outer periphery of the base wall 3, and a first wall 22 extending from the peripheral wall 22 of the first main retaining wall 2 Aileron. The peripheral wall 22 of the raft 41 approaching the rim 2 is substantially sheet-shaped, 42. The first aileron portion 42 42 has a higher than the first main wing portion 41, and the first aileron portion ...the curved section 421 is away from the base wall 3_曲延:the curved section 421', the second blade 5 and the peripheral wall of the hub 2

The second blade 5 includes an outer space from the base wall 3 and each of the ^ fi at ± w ^ , 'to the peripheral wall 22 51 ' of the hub 2 is provided with two adjacent first blades for each n blade 5 Between the first main wing portions 41 of the four, the number of the second blades 5 disposed between the adjacent two first main wing portions 41 is one or a plurality of pieces, and therefore should not be limited to this embodiment. The surround 6 is looped adjacent to the first main wing of each of the first fan blades 4

41 and the top end edge of the second main wing portion 51 of each of the second blades 5, the surrounding member 6 is designed such that the first main wing portion 41 and the second main wing portion are simultaneously The surrounding member 6 is fixed to reduce the vibration generated by the excessive resistance pressure, and effectively reduce noise and wind cutting sound. When the axial airflow is introduced into the first preferred embodiment of the present invention, it rebounds after colliding with the base wall 3, and the airflow is introduced into the adjacent two first blades via the first-fourth aileron portion 42 of the first money. 4, the airflow is radially exhausted through the first main wing portion 41 and the second blade 5, and the first blade 4 is added to the first aileron portion 42 by a conventional blade. That is, the windward area of each of the first blades 4 is increased, so that the wind pressure and the air volume are increased, and the curved shape of the first curved section 421 of each of the first ailerons 42 forms a wind 8 resistance and makes the wind The pressure rise also makes the flow of the airflow more directional than the turbulent flow, which reduces many noises and wind cuts. The preferred embodiment of the present invention, which has the advantages of large air volume, high wind pressure, and good heat dissipation effect, can be more clearly shown by the first embodiment of the present invention and the conventional data of the centrifugal heat dissipating fan. As shown in Fig. 3, the horizontal purity (m3/min) and the longitudinal coordinate (Congqi 2〇) represent the air volume of the mother minute and the pressure value of the millimeter water column (that is, the wind pressure). Root, the experimental results show that when the size ratio is the same, for example, when the air volume is also about 4 G.1621 m ^ 3 / min, the wind pressure of the technology is about 18.5 mm water column, and the wind pressure of the present invention It is about 2〇·3mm water column; when the wind pressure is also about 6.8mm water column, the air volume of the prior art is about 2462 m3/min, and the air volume of the present invention is about 2632 m3/per. ^刀钟. From this, it can be seen that the present invention has a relatively large air volume and a high wind pressure as compared with the prior art, so that the heat dissipation effect can be increased. As shown in FIG. 4, the second preferred embodiment of the fan blade device of the heat dissipating fan of the present invention is substantially the same as the first preferred embodiment, and the main difference is that the second preferred embodiment is a front side. And the back side simultaneously axially enters the air, the base wall 3 includes a plurality of through air flow holes 31, the air flow holes 31 are spaced around the peripheral wall 22 of the hub 2, and the air flow holes 31 and the first blade 4 The first ailerons 42 are disposed correspondingly to each other, and the base wall 3 is partially hollowed out to form the design of the airflow hole 31 to allow the airflow to enter axially from the front and the back of the blade device simultaneously to increase the flow of the airflow, indirectly. Increase the wind pressure and air volume of the fan blade device. As shown in FIG. 5, the third preferred embodiment of the fan blade device of the present invention is the same as the first preferred embodiment, and the main difference is that each of the second blade 5 is further Including a second aileron portion 52 extending from the second main wing portion 51 toward the peripheral wall 22 of the hub 2, the second aileron portion 52 is substantially sheet-like and adjacent to the peripheral wall 22 of the wheel 2 The aileron 52 has a second curved section 521 that is higher than the top surface of the second main wing 52, and the second curved section 521 extends in a direction f away from the base wall 3. By increasing the second aileron portion 52 of the second blade 5, the windward area of the second blade 5 is increased, so that the wind pressure is increased, and the second of each second aileron portion 52 is In the curved shape of the segment 521, the wind resistance is formed to increase the wind pressure, and the airflow is more directional, and it is not easy to escape and turbulence everywhere, thereby reducing many noises and wind cuts. In summary, the first aileron 42 of the first blade 4 of the present invention is a sheet-like device when the air is drawn into the axial direction. The ten-phase has a larger vertical windward area than the arc-shaped blade, so that the wind pressure and the air volume also increase due to the increase of the windward area, and the first curved section of the first-aileron 42 The 421 is higher than the top surface of the first main wing portion 4 and extends toward the base wall 3, thereby effectively increasing the wind resistance, increasing the wind pressure, and reducing the noise and wind cutting sound during operation. The object of the invention can be achieved. However, the above is only the three preferred embodiments of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent of the scope of the main patent and the description of the invention according to the present invention. Changes and revisions are still covered by the patents of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a state of a conventional centrifugal fan. FIG. 2 is a perspective view showing a first preferred embodiment of a fan device for a heat dissipating fan of the present invention; - experimental graph, illustrating experimental data of the air volume/wind pressure of the first preferred embodiment and the conventional centrifugal cooling fan; illustrating the blade device of the cooling fan of the present invention; FIG. 4 is a second preferred embodiment of a top view; And Figure 5 is a perspective view, a third preferred embodiment. 1326406 of the fan blade device of the heat dissipation fan of the present invention. [Main component symbol description] 2... •... Hub 42... First aileron portion 21 • Top wall 421 ····... First curved segment 22 • ...周壁5... •...Second leaf blade 3.........·Base wall 51 ...·Second main wing section Ο 1..... C 〇..... •...Wall-Si! WD 1 Milk> Knife 匕ZJ 弟一 W 部部4... -----Face 521 ··· •...Second curved section 41 ···.. •...·First main wing part 6............·Rolling piece

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Claims (1)

X. Patent application scope: h—a fan blade device of a cooling fan, comprising a peripheral wall of a top wall; comprising: and — extending downward from a peripheral wall of the top wall, and extending outward from a lower periphery of the peripheral wall of the hub ; number - the blade, equidistantly spaced on the top surface of the base wall and * = the circumference of the circumference of the wheel is spaced 'every H leaf includes - from the base wall: the edge extends toward the peripheral wall of the rim a main wing portion, and a first aileron portion extending from the first main wing portion toward a peripheral wall of the hub, the first aileron portion being substantially flaky, and the first aileron portion being closer to the wheel than the peripheral wall Having a first curved section higher than a top surface of the first main wing, the first curved section is curved away from the base wall; and 多数 a plurality of second blades are respectively spaced apart by a specific number Between each two adjacent first vanes and spaced apart from the peripheral wall of the hub, each second vane includes a second main wing extending from the edge of the base wall toward the peripheral wall of the material. 2. The fan blade device of the heat dissipation fan according to claim i, wherein the base wall includes a plurality of through air flow holes, the air flow holes are spaced around a peripheral wall of the hub, and the air flow holes are The first aileron portions of the first blade are disposed corresponding to each other. 3. The fan blade device of the heat dissipating fan according to claim 2, further comprising a surround member disposed adjacent a top end edge of each of the first main wing portions and each of the second main wing portions. 4. The fan blade device of the cooling fan according to item 3 of the patent application scope, 13 (5 1326406 Each of the second blades further includes a second aileron extending from the second main wing toward the peripheral wall of the hub, and the second aileron is substantially flaky near the peripheral wall of the hub, and the The second aileron has a second curved section that is higher than a top surface of the second main wing, and the second curved section extends in a curved direction away from the base wall. 14