CN203067351U - Fan blade device for cooling fan with noise reduction effect - Google Patents

Abstract

The fan blade device of heat radiating fan with noise reducing effect has one air inlet side for air to flow into and one air outlet side opposite to the air inlet side for air to flow out. Each blade is provided with a windward surface facing the windward side, a leeward surface facing the air outlet side, a raised part formed at one end of the windward side far away from the hub, a plurality of depressed parts formed on the windward surface at intervals and positioned between the hub and the raised part, and a plurality of protruding parts formed on the leeward surface at intervals and respectively corresponding to the positions of the depressed parts. By means of the design of the raised part and the depressed part on each blade, the turbulent flow phenomenon of the air flow can be effectively reduced, and the noise generated when the cooling fan operates is further reduced.

Description

Fan blade device for cooling fan with noise reduction effect

technical field

The utility model relates to a fan blade device, in particular to a fan blade device of a cooling fan with the effect of reducing noise. the

Background technique

Cooling fans are used in a wide range of fields, such as industrial products and electronic instruments, you can see the extended application of cooling fans. the

Referring to FIG. 1 , the conventional cooling fan 1 includes a hollow housing 11 , a hub 12 , and a blade set 13 . The hub 12 is pivotally mounted in the casing 11 and can rotate around its own axis. The fan blade set 13 has a plurality of blades 131 disposed on the outer peripheral surface of the hub 12 at intervals. the

When the existing cooling fan 1 was in operation, the outer edge of the blade 131 of the high-speed operation and the housing 11 would easily generate a larger noise (wind cutting sound) due to air turbulence. If people are in an environment with background noise for a long time Under the environment, it is easy to make people feel irritable and lack of quality of life, especially in the environment full of noise for a long time, it is more likely to have adverse effects on psychology and physiology. the

Referring to Fig. 2, in order to solve the above-mentioned problems, just as the technology disclosed in the Taiwan Patent No. M395067 "Improved Structure of Radiating Fan Rotor Base" is by changing the structure of the thin support bar 21 on the main body 2 of the base And shape, to reduce the noise generated by the impact of airflow. However, the noise generated when the cooling fan is running is mainly caused by the airflow directly hitting the surface of the fan blade. Therefore, only by changing the structure and shape of the thin-diameter support bar 21, the improvement of the noise is still limited. the

Contents of the invention

The purpose of the utility model is to provide a fan blade device of a cooling fan which can reduce the noise and has the effect of reducing the noise. the

The utility model has a fan blade device of a heat dissipation fan with a noise reduction effect, and defines an air inlet side for air flow in, and an air outlet side opposite to the air inlet side for air flow out, and the fan blade device includes a hub , and several blades arranged around the hub at intervals. Each blade has a windward side facing the windward side, a leeward side facing the windward side, a bulge formed on the end of the windward side away from the hub, several intervals formed on the windward side and A concave portion located between the hub and the protruding portion, and several protruding portions formed on the leeward surface at intervals and respectively corresponding to the positions of the concave portions. the

The purpose of the utility model and the solution to its technical problems can also be further realized by adopting the following technical measures. the

Preferably, in the fan blade device of the cooling fan with the effect of reducing noise, each blade also has a first side facing the wind inlet side and a second side facing the wind outlet side, said The recesses are arranged at intervals along the first side and extend toward the second side. the

The beneficial effect of the utility model is that: the design of the protruding part and the concave part on each blade can effectively reduce the turbulence phenomenon of the air flow, and further reduce the noise generated when the cooling fan is running. the

Description of drawings

Fig. 1 is a top view, illustrates existing cooling fan;

Figure 2 is a three-dimensional exploded view, which is the "improved structure of the cooling fan rotor base" disclosed in Taiwan Patent No. M395067;

Fig. 3 is a perspective view illustrating a preferred embodiment of the fan blade device of the cooling fan with noise reduction effect of the present invention;

Figure 4 is a side view, assisting in explaining Figure 3;

Fig. 5 is a bottom view, auxiliary explanation Fig. 3; And

FIG. 6 is a partial perspective view to assist in explaining FIG. 3 . the

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described in detail. the

Referring to Figures 3 to 5, it is a preferred embodiment of the fan blade device 3 of the cooling fan with the noise reduction effect of the present invention. The wind side A is the wind outlet side B for the airflow to flow out of. The fan blade device 3 includes a hub 31 and a plurality of blades 32 arranged around the hub 31 at intervals. the

Each blade 32 has a windward surface 321 facing the wind inlet side A, a leeward surface 322 facing the wind outlet side B, a first side 323 facing the wind inlet side A, and a first side 323 facing the wind outlet side B. the second side 324 of the windward surface 321, a raised portion 325 formed on the end of the windward surface 321 away from the hub 31, and several depressions formed on the windward surface 321 at intervals between the hub 31 and the raised portion 325 326, and several projections 327 formed on the leeward surface 322 at intervals and respectively corresponding to the positions of the recesses 326, and the recesses 326 are arranged at intervals along the first side 323 and toward the first side 323. The direction of the two sides 324 extends. the

Boundary layer separation is a fluid phenomenon, which means that the boundary layer that originally flows close to the surface of the object separates from the surface of the object. In aerodynamics, the separation of the boundary layer will increase the resistance. Therefore, many studies on fluid dynamics are exploring how to design the surface and shape of the object to slow down the separation of the boundary layer and keep the boundary layer on the surface of the object as much as possible. . the

Referring to Figures 3 and 6, the utility model mainly allows the fan blade device 3 to imitate the design of the tail fin of a whale, and a recess 326 is formed on the windward surface 321 of each blade 32, and the design of the recess 326 can make The rebound height of the airflow after hitting the concave portion 326 is less than the height of the rebound after the airflow hits the windward surface 321 of the blade 32, which slows down the phenomenon of boundary layer separation, and can reduce the vortex generated by the airflow near each blade 32, thereby reducing the The noise (wind cutting sound) generated by the operation of the cooling fan can achieve a quiet effect, and at the same time, it can also prevent the eddy current from causing the blades 32 to stall and affect the performance of the cooling fan. In addition, the design of the protruding portion 325 of each blade 32 is helpful to prevent the leakage of the airflow, and can also reduce the wind cutting sound generated when the fan blade device 3 rotates, further improving the effect of silence. the

As shown in Table 1, it is the experimental result of actually measuring the noise level. The experimental group is the heat dissipation fan using the fan blade device 3 of the present utility model, and the heat dissipation fan of the control group is that the blade 32 is not formed with the concave portion 326 and the raised portion. 325. From the experimental results in Table 1, it can be seen that the average noise value of the control group is 27.4 decibels (dB), while the average noise value of the experimental group is 25.5 decibels. It can be seen that the recessed portion 326 and the protruding portion 325 formed on the blade 32 can indeed reduce the noise generated when the fan blade device 3 rotates. the

To sum up, the fan blade device 3 of the utility model has the effect of reducing noise, and the design of the raised portion 325 and the concave portion 326 on each blade 32 can effectively reduce the turbulence phenomenon of the air flow, thereby reducing The noise produced by the cooling fan when it is running. the

Table I

。

.

Claims (2)

1. flabellum device with the radiation fan that reduces noise result, the inlet air side that definition has an air feed stream to flow into, reach one in contrast to this inlet air side and the air side that air feed stream flows out, this flabellum device comprises a wheel hub, and several pieces spacer ring windings place the blade on this wheel hub, each sheet blade has one towards the windward side of this inlet air side, lee face towards this air side, it is characterized in that: each sheet blade also has one and is formed at this windward side away from the ridge on the end of this wheel hub, several be formed on this windward side at interval and be positioned at this wheel hub and this ridge between depressed part, and several are formed on this lee face and the bump of the position of corresponding described depressed part respectively at interval.

2. according to the described flabellum device with the radiation fan that reduces noise result of claim 1, it is characterized in that: each sheet blade also has one towards the first side of this inlet air side, and the second side towards this air side, described depressed part is to arrange at interval along this first side also to extend toward the direction of this second side.

Images