JP3100254U - Blade structure of centrifugal swing-back radiator fan - Google Patents

Abstract

An object of the present invention is to improve a blade structure of a heat radiating fan for reducing noise and defective products.
The radiating fan has a bearing boss, and a plurality of blades are arranged at predetermined intervals on an outer peripheral surface of the bearing boss so as to surround the bearing boss. The front surface 321 includes an air resistance-receiving surface 321 and a back surface 322 serving as a negative pressure side. The front surface has a slightly curved arc shape along the longitudinal direction. A streamlined structure that extends toward the back surface 322 and protrudes and terminates at the center of the back surface continuity with the curved portion formed at the boundary 323 of FIG.
[Selection diagram] FIG.

Description

The present invention relates to a blade structure of a centrifugal swing-back type radiating fan. When the improved wing structure of the present invention is used for a related radiating system, it is possible to reduce a noise problem generated by the blade of the radiating fan and at the same condition. The present invention relates to a blade structure of a heat dissipating fan which is capable of greatly improving the rotational speed of the heat dissipating fan according to the present invention even when the current and voltage are supplied below, when compared with the rotational speed of the conventional heat dissipating fan.

In the modern era of advanced science and technology, computers and their related products manufactured by each manufacturer are electronic products that can process information at high speed with all their abilities to focus the attention of consumers. Pursuing and developing.

However, to be able to process information at a high speed requires a lot of thermal energy to be consumed, and under the same conditions (for example, space, volume, material, etc.), the increase in thermal energy also increases or decreases depending on those conditions. However, it is necessary to dissipate the heat energy generated from the electronic device using an appropriate device. In general, heat radiation is performed using a fan as the appropriate device.

メ ー In order to increase the heat dissipation effect of the heat dissipation fan, each manufacturer is pursuing a favorable heat dissipation effect by devoting their development power to improving the heat dissipation fan. However, in order to pursue a more favorable heat dissipation effect, most manufacturers try to increase the rotation speed of the heat dissipation fan, but the problem of "noise" generated by the heat dissipation fan itself is a bottleneck. . In addition, such "noise" problems are becoming increasingly important to consumers.

The following three factors can be cited as the causes of noise generation due to the overall configuration of the heat dissipation fan. That is,
1) The design of the blade structure of the heat dissipation fan is inappropriate. That is, when the motor rotates the blades of the radiating fan, for example, when gas molecules are air, when the air advances along the flow of the blade-shaped edge curve, the air becomes a resistance surface of the blades. A turbulence such as a vortex phenomenon occurs at the trailing end of the blade on the negative pressure side, and the vortex generated by the turbulence region causes noise.

2) The weights of the plurality of blades are slightly different and non-uniform at the time of manufacture, and the difference in the weight of each blade causes instability to the components of the entire fan, which has a considerable adverse effect. I have. When the radiating fan is rotated at a high speed while the manufacturing error of the weight of each blade exceeds the allowable range, vibrations are generated in the axial direction and the radial direction, respectively, and humming due to the vibration from each component of the fan. This is a cause of noise.

3) After driving the heat radiating fan, air hits the blades, hits the fan frame, or hits the module or heat radiating device after the air (gas molecules) flows out of the fan. Is a noise generated by colliding with the member.

The above three factors are the main causes of noise generated by the radiating fan. Of these, 3) is almost inevitable because air (gas molecules) is generated by collision with an object. Since it is present and the volume of noise generated by the noise is low, it can be excluded from consideration.

Regarding 2), if the weights of the respective blades are similar, no high-volume noise is generated within the permissible range of the blade manufacturing error. However, if the permissible range is exceeded, the manufacturer does not operate. It can be resolved by deeming it a good product and disposing of it.

Therefore, as a noise prevention measure, the above factor 1) is particularly important, and the present invention is about to be improved.

FIG. 1 is a perspective view showing a conventional heat radiating fan. The heat radiating fan 1 has a bearing boss 11, and a plurality of flat plate-like blades 12 are provided on an outer peripheral surface of the bearing boss 11. Are arranged at equal intervals. The heat radiating fan 1 is connected to a rotating shaft of a motor (not shown) to be rotated.

Therefore, air (gas molecules) also flows with the rotation of the radiating fan 1, and the path where the flow of air is generated is generally called a flow channel.

FIG. 2 is a side view of the blades of the conventional heat dissipation fan and an explanatory diagram showing the flow of air around the blades.

When the radiating fan 1 rotates, first, air (gas molecules) is agitated and sucked by the blades 12, hits the surfaces (wind receiving surfaces) 121 of the blades, and is guided to the upper and lower edges 1211 of the surface 121, and further the blades 12, a vortex occurs in the turbulence region 2 near the rear end of the back surface 122 on the negative pressure side of the blade 12.

Such phenomena are already known, and in order to avoid this, at airports and the like, for example, when a large airplane (for example, 747) takes off or lands on a runway, the air route of the airplane may vary for several minutes. Prohibits the use of airplanes.

It is known that especially small airplanes can easily become involved in the swirl created when a large airplane takes off or land, causing a serious accident.

In addition, when the shape of the surface 121 of the blade 12 and the upper and lower edges 1211 of the surface 121 is non-streamlined and has a sharp angle, according to the principle of aerodynamics, The linear aspect can lead to resistance during rotation and expansion of the turbulence region 2, and the vortex phenomenon becomes more apparent, and this vortex phenomenon is the main cause of noise generation.

Therefore, an object of the present invention is to provide a blade structure of a centrifugal swing-back radiating fan that reduces the noise amount by reducing the turbulence region 2 and reducing the vortex phenomenon.

In the blade structure of the centrifugal swing-back radiating fan according to the present invention, the radiating fan has a bearing boss portion, and a plurality of blades are arranged at predetermined intervals on the outer peripheral surface of the bearing boss portion so as to surround the bearing boss portion. The blade shape includes a surface 321 receiving air resistance due to rotation and a back surface 322 serving as a negative pressure side, and the front surface has an arc shape slightly curved along a longitudinal direction. It is a streamlined structure that extends from the front surface 321 to the curved portion formed at the boundary 323 of each of the upper and lower intersections, extends toward the rear surface 322, protrudes at the center of the rear surface, and ends. .

と す る By forming the blade in the shape described above, the generation range of the turbulent flow area on the wind negative pressure surface can be significantly reduced, the swirling phenomenon is less likely to occur, and the object of reducing the amount of noise can be achieved.

遠 心 The blade structure of the centrifugal swing-back radiator fan according to the present invention has the following effects.

1. The blades of the present invention exhibit a streamlined shape, which provides a blade with low resistance that does not allow swirls or stagnation suitable for the principle of aerodynamics, and easily reduces the turbulent flow region generated on the back side of the blades As a result, the swirling phenomenon is reduced, and the amount of noise generated by the heat radiating fan can be significantly reduced.

{2. Even when the same voltage and current are supplied under the same conditions, the heat radiating fan of the present invention and the conventional heat radiating fan can easily rotate the rotating speed of the present invention by 1000 to 2,000 rotations / minute (from the conventional rotating speed). (Hereinafter referred to as rpm.)

Further, since the static pressure value (PS, static @ pressure) is directly proportional to the square value of the rpm, when the rpm value is increased, the static pressure value is greatly increased. The area effect can be expanded.

{3. The blade of the present invention is significantly larger than the conventional blade 12 and has a larger weight. Therefore, when manufacturing the blades, the allowable weight error of each blade can be improved, and the allowable error of the manufacturing error is less likely to be exceeded.

Therefore, the stability of the structural body can be improved, the vibrations generated in the axial and radial directions during high-speed rotation can be reduced, and even in the design of the mold for molding the blade, high precision is required as in the past. There is no need to perform this, and the cost required for the mold design can be greatly reduced, and manufacturing can be performed at low cost.

As described above, the blade structure of the centrifugal swing-back type radiating fan of the present invention can greatly reduce the noise generated when the radiating fan rotates, can easily increase the rotation speed of the radiating fan, and greatly increase the static pressure value. And the effect of the heat radiation area can be expanded.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

FIG. 3 is a perspective view showing the heat radiating fan of the present invention. The heat radiating fan 3 has a bearing boss 31, and a plurality of streamlined blades 32 are provided on the outer peripheral surface of the bearing boss 31. Are arranged. The heat radiating fan 3 is connected to a drive shaft of a motor (not shown) to rotate, and air (gas molecules) flows by the rotation of the heat radiating fan 3.

As is apparent from FIG. 3, the heat dissipation fan has a bearing boss 31, and a plurality of blades 32 are arranged on the outer peripheral surface of the bearing boss 31 at predetermined intervals so as to surround the bearing boss 31. The blade shape includes a front surface 321 receiving air resistance due to rotation and a back surface 322 serving as a negative pressure side. The front surface has an arc shape slightly curved along a longitudinal direction. 321 is continuous with the curved portion formed at the boundary 323 of the upper and lower intersections, and extends toward the back surface 322, protrudes at the center of the back surface, and ends in a streamlined manner.

FIG. 4 is an explanatory view showing streamlines of air (gas molecules) flowing on the side surfaces of the blades 32 of the heat radiation fan 3 according to the present invention. The blades 32 have a front surface (wind receiving surface) 321 and a rear surface (wind carrying surface) 322. And the front surface 321 and the back surface 322 are formed vertically symmetrically, and the boundary 323 of the upper and lower intersections of the front surface 321 and the back surface 322 is formed by bending, and the back surface 322 continuous with the curved portion is formed. , And is formed in a streamline shape that terminates at the center of the back surface 322.

Further, the entire configuration of the blade 32 is formed of a solid member having a substantially elliptical cylindrical shape with a vertical cross section, the surface on the side receiving the air resistance is formed in a curved arc shape, and the back surface 322 on the negative pressure side is the front surface 322. It is formed in a streamlined shape that continues from the curved portion that continues from 321 and ends at the center of the back surface 322.

Therefore, when the blade 32 rotates, the air easily adheres to the surface of the blade 32 and flows, and is hardly diffused outward, and the range of the turbulent flow region 4 can be reduced, thereby reducing the swirling phenomenon. . Therefore, the volume of the noise generated by the blades is obviously reduced.

Furthermore, since the surface 321 has an arc-like shape protruding outward, the resistance of the blade 32 to the surface 321 can be reduced.

構成 Such a configuration is similar to the purpose of providing a streamlined bumper on the front of a vehicle such as a truck, for example. That is, it is to prevent the air from directly impacting the vehicle body to generate excessive resistance and waste energy, and the range of the turbulence region 4 is also reduced. Further, a forward push force can be provided to the blades 32. For example, all the vehicles in the racetrack are provided with airflow interference plates, and the purpose is to concentrate the air resistance flowing through the vehicles. This can be explained from the fact that when the air (gas molecules) separates from the vehicle body, the stability of the vehicle body can be improved and a forward push force can be applied to the vehicle body.

Therefore, the present invention can reduce the aerodynamic drag force and increase the forward thrust. Further, in a situation where the same voltage and current are supplied to the radiating fan 3 of the present invention and the conventional radiating fan 1, the rotation speed of the radiating fan 3 of the present invention is faster than that of the general conventional radiating fan 1. The amount of air generated by the present invention is larger than that of a general heat dissipation fan 1 and an excellent heat dissipation effect can be achieved.

FIG. 5 is an exploded view of the embodiment using the blade structure of the heat radiation fan of the present invention.

The heat radiating fan 3 is disposed on a fan frame. The fan frame includes an upper plate 5 and a lower frame 6 having an upper opening. The upper plate 5 has a plurality of air inlets 51 at the center. The lower frame 6 has a fan storage space 61, and a central bottom plate has an opening through which a drive shaft 62 from a motor communicates. The lower frame 6 is provided with a pair of opening holes facing each other at a side wall position which does not become an adjacent portion, and serves as an air outlet 63 in the fan frame.

In the assembly, the heat radiation fan 3 is housed in the storage space 61, the bearing formed on the bearing boss 31 of the heat radiation fan 3 is connected to the motor drive shaft 62, and the upper plate 5 is mounted on the upper opening.

FIG. 6 is an assembly view of FIG. 5. As can be seen from this drawing, the fan frame includes an air inlet 51 of the upper plate 5 and an air outlet 63 of the lower frame 6, When the radiator fan 3 is driven by the drive shaft 62 (see FIG. 5) of the motor, the air sucked from the air inlet is guided by the blades 32 of the radiator fan 3 and discharged from the pair of air outlets 63. You. It can be said that the discharged air is sucked in again from the air introduction port 51 to balance the pressure in the area near the heat radiating fan 3, balances the air, and forms a kind of circulation.

The specific structure described above is merely an example for implementing the present invention, and does not narrowly define the scope of the utility model registration claim of the present invention. It goes without saying that all changes, modifications, partial conversions, etc. within the scope of the present invention are included in the scope of the present invention.

It is a perspective view showing the blade structure of the conventional heat dissipation fan. It is the side view of the blade structure of the conventional radiation fan, and the streamline explanatory drawing which shows the flow of the air around a blade. FIG. 3 is a perspective view showing a blade structure of the heat radiating fan according to the embodiment of the present invention. FIG. 3 is a side view of the blades of the heat dissipation fan of the present invention, and a streamline explanatory diagram showing the flow of air around the blades. FIG. 4 is an exploded perspective view showing an embodiment of the heat dissipation fan of the present invention. FIG. 4 is an assembly view showing an embodiment of the heat dissipation fan of the present invention.

Explanation of reference numerals

REFERENCE SIGNS LIST 1 radiator fan 2 turbulent region 3 radiator fan 4 turbulent region 5 upper plate 6 lower frame 11 bearing boss 12 blade 31 bearing boss 32 blade 51 air inlet 61 storage space 62 motor drive shaft 63 air guide Exit 121 surface (wind receiving surface)
122 back side (wind-bearing side)
321 surface (wind surface)
322 back side (wind-bearing side)
323 boundary 1211 boundary

Claims (10)

The heat radiating fan has a bearing boss portion, and a plurality of blades are arranged on the outer peripheral surface of the bearing boss portion at predetermined intervals so as to surround the bearing boss portion, and the blade shape receives air resistance due to rotation. The front surface 321 is composed of a front surface 321 and a back surface 322 serving as a negative pressure side. The front surface has an arc shape slightly curved along the longitudinal direction. A blade structure of a centrifugal swing-back radiating fan, wherein the blade structure is a streamlined structure that extends toward the back surface 322 side and protrudes and terminates at the center of the back surface, continuing from the formed curved portion. The blade structure of the centrifugal swing-back radiating fan according to claim 1, wherein the front and rear surfaces are formed to be vertically symmetrical. The blade structure of the centrifugal swing-back radiating fan according to claim 1, wherein a plastic material is used as a constituent material of the radiating fan. The blade structure of the centrifugal swingback type heat radiation fan according to claim 1, wherein the blades of the heat radiation fan are solid cylindrical. The vane structure of a centrifugal swingback heat radiating fan according to claim 1, wherein the heat radiating fan is disposed on the fan frame via a bearing boss. The blade structure of a centrifugal swing-back radiating fan according to claim 5, wherein the fan frame has an upper plate and a lower frame. 7. The blade structure of a centrifugal swing-back radiating fan according to claim 6, wherein the upper plate has a plurality of air inlets. 7. The blade structure of the centrifugal swing-back radiating fan according to claim 6, wherein the lower frame has a storage space. The blade structure of a centrifugal swing-back radiating fan according to claim 6, wherein a motor is attached to the lower frame. 7. The blade structure of a centrifugal swing-back radiating fan according to claim 6, wherein the lower frame has at least one air outlet.

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