TWM529763U - Flow rate enhanced composite blade structure of axial fan - Google Patents

Description

Composite fan blade air volume enhancement structure of axial flow fan

The present invention relates to the field of mechanical fan heat equipment, and more particularly to a composite fan blade air volume enhancement structure of an axial fan.

With the rapid development of the computer industry, the central processing unit (CPU) and other chips are constantly pursuing high functionality, high speed and miniaturization, which makes the thermal energy accumulation problem more and more serious. How to remove the thermal energy of the heating element such as the electronic chip gradually The ground is valued. The most commonly used heat dissipating components in the industry are heat conductors, heat pipes, heat sinks and cooling fans. The most immediate effect is the cooling fan, which is generated by the low-temperature airflow generated by the cooling fan. The heat exchange effect, while the heat is discharged outside the casing, the cooling fan has a very important position in all the heat dissipating components.

Referring to FIG. 1, a common cooling fan mainly includes: a frame (not shown) and a blade group 1 accommodated in the frame, wherein the blade group 1 is composed of a hub 10 and is divided into A plurality of blades 11 around the hub 10 are formed. When the blade group 1 rotates in the frame, the blade 11 drives the air to generate an axial airflow. The higher the rotational speed of the blade group 1 is, the faster the airflow rate is. The greater the air volume, the better the heat exchange effect. How to pursue high air volume and high wind pressure in a limited speed range is a common technical bottleneck in the industry. In the above, each of the blades 11 is provided with a corresponding upper curved surface 111 and a lower curved surface 112, and the curved surface of the lower curved surface 112 is gentler than the upper curved surface 111, so when the blade group 1 rotates disturbing gas During the flow, the air flow generates different pressures and flow rates on the upper curved surface 111 and the lower curved surface 112 respectively. According to the Bernoulli flow, the flow velocity on the upper curved surface 111 is higher, and the pressure is lower. The flow velocity on the lower arc surface 112 is lower and the pressure is higher. Therefore, most of the airflow flows into the upper arc surface of the low pressure, so that the airflow flowing into the upper arc surface 111 and the lower arc surface 112 is applied to each fan blade. At the end of the 11th, two streams of different flow directions and flow rates are generated. Generally speaking, the airflow of the lower arc surface 112 flows toward the axial direction, so it is called the axial airflow, and the airflow direction of the upper arc surface 111 is in the tangential direction, so it is called the tangent. Airflow, however, the tangential airflow has a large gas flow rate, so it will offset the axial velocity airflow and cause eddy current loss, which may cause the fan air volume and wind pressure to be effectively increased.

To this end, how to improve the tangential airflow with a large airflow at the end of the blade and bend it into a workable axial airflow, thereby increasing the air volume of the blade is a subject of practical creation.

The technical problem to be solved in this creation is to provide a composite fan blade air volume enhancement structure of the axial flow fan according to the defects existing in the existing design technology, the fan noise is small, the rotation is stable, and the fan air volume is enhanced.

In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: a composite fan blade air volume enhancement structure of an axial flow fan, the blade includes: a hub and a plurality of first blades, wherein the inner ends of the plurality of first blades are separately provided a plurality of second blades are added to the outer ends of the plurality of first blades, and each of the second blades is connected to the first blades at the front and rear positions of the second blades by two supporting ribs; The second blade area is smaller than the first blade area, and the first blade and the second blade are staggered so that the airflow above the first blade is bent into the axial flow below the first blade by the second blade in.

As a further explanation of the above technical solutions:

In the above technical solution, the two supporting ribs include a first supporting rib and a second supporting rib, and the outer ends of each of the second blades are connected to the two at the front and rear positions of the second blade by the first supporting rib. An outer end of one of the first vanes, and an outer end of the second vane is flush with an outer end of the first vane to which the second vane is connected, and an inner end of the second vane is connected by a second support rib Go to the other first blade.

In the above technical solution, the second blade and the first blade connected to the outer end thereof maintain a spacing which matches the length of the first support rib.

In the above technical solution, the second blade and the first blade connected to the inner end thereof maintain a space, the interval width of the interval matches the length of the second support rib, and the first blade, the first blade The two blades and the second support rib form an enhanced interval for enhancing the axial air volume over the interval.

In the above technical solution, the first blade is provided with a first upper curved surface and a first lower curved surface on the upper and lower corresponding surfaces, and the second blade is disposed on the upper and lower sides. The second upper curved surface and the second lower curved surface of the surface, and the upper and lower curved surfaces of the first blade and the second blade are matched and matched.

The utility model has the beneficial effects that the utility model uses the second blade to bend the airflow flowing through the first upper arc surface of the first blade into the second lower arc surface, so that the axial airflow generated by the lower arc surface can be effectively Increase the fan's air volume. The fan noise is small and the rotation is stable.

1‧‧·wheels

2‧‧‧First blade

3‧‧‧second blade

4‧‧‧Support ribs

21‧‧‧First upper curved surface

22‧‧‧First lower curved surface

31‧‧‧Second upper curved surface

32‧‧‧Second lower arc

41‧‧‧second support rib

42‧‧‧First support rib

1 is a schematic perspective view of a conventional fan.

2 is a schematic perspective view of the fan of the present invention, and the wind direction arrow indicates the direction of the wind.

FIG. 3 is a second schematic structural view of the fan of the present invention.

The present invention will be further described in detail below with reference to the accompanying drawings.

Figures 2-3 illustrate an embodiment of the present creation. Referring to Figures 2-3, a composite fan air volume enhancement structure of an axial flow fan includes: a wheel, 1 and a plurality of first blades 2, wherein the first blade 2 includes upper and lower corresponding faces The first upper curved surface 21 and the first lower curved surface 22 (the first upper curved surface 21 is a convex curved surface, and the first lower curved surface 22 is a concave curved surface); the inner ends of the first first vanes 2 are separately provided A plurality of second blades 3 are added to the outer ends of the plurality of first blades 2, wherein the second blades 3 include a second upper curved surface 31 and a second lower arc at the upper and lower opposite surfaces. Face 32 (of course, the second upper curved surface 31 is a convex curved surface, and the second lower curved surface 32 is a concave curved surface), and the upper and lower curved surfaces of the first blade 2 and the second blade 3 are kept parallel (that is, The first upper curved surface 21 and the second upper curved surface 31 are kept parallel, and the parallel means that the arc and the curvature of the curved surface are consistent, and the distance between the two points at the corresponding positions on the curved surface is always equal, and the same The curved faces are also parallel; each of the second blades 3 is connected to the first blades 2 at the front and rear positions of the second blades 3 through the two supporting ribs 4 In the present invention, the two first blades 2 in the front and rear positions refer to the front and rear of the hub 1 in a counterclockwise manner. In addition, the area of the second blade 3 is smaller than the area of the first blade 2, and the first blade 2 and the second blade 3 are staggered, so that the airflow above the first blade 2 is bent and flows through the second blade 2. In the axial airflow below the first blade 2; when the blade rotates, the plurality of first blades 2 around the hub 1 drive the air to generate an axial airflow, and the higher the rotational speed of the blade, the faster the flow rate of the airflow In contrast, the amount of wind generated is greater. Referring to FIG. 2, the two supporting ribs 4 include a first supporting rib 42 and a second supporting rib 41, and the outer ends of each of the second blades 3 are connected by the first supporting ribs 42 at the front and rear positions of the second blade 3. One of the two first blades 2 The outer end of the second blade 2 is flush with the outer end of the first blade 2 connected thereto, and the inner end of the second blade 2 is connected to the other through the second support rib 41 On the first blade 2 described above (it is to be noted that, in the present description, the two first blades 2 in the front and rear positions are connected by two supporting ribs 4 and the second blade 3, and the first supporting ribs 42 are connected to the second blade 3 The outer end, the inner end is connected to the middle of the other first blade 2 through the second support rib 41, in addition to strengthening the stability of the first blade 2, it can also be used for the support of the added second blade 3. Wherein, two spaced spaces are formed between the second blade 3 and the first blade 2, one of which is a space formed by the second blade 3 and the latter first blade 2, that is, the second blade 3 and the outer side thereof The first blades 2 connected at the ends are maintained at a pitch which matches the length of the first support ribs 42; the other interval is a space formed by the second blades 3 with respect to the preceding first blades 2, That is, the second vane 3 and the first vane 2 connected to the inner end thereof are spaced apart, the interval width of the interval is matched with the length of the second supporting rib 41, and the other interval is the same. One blade 1, the second blade 2, and the second support rib 41 constitute and form an enhanced section for enhancing the axial air volume. In this embodiment, when the blade rotates, the airflow on the first upper curved surface 21 of the first blade 2 is bent by the second blade 3 and flows into the first lower arc of the first blade 2 by the enhanced section of the axial air volume. The axial flow formed by the face 22 (shown in Figure 2), in addition to increasing the amount of axial airflow, while effectively reducing the eddy current losses generated between the tangential flow and the axial flow.

The above description is not intended to limit the technical scope of the present invention, and any modifications, equivalent changes and modifications made to the above embodiments in accordance with the spirit of the present invention are still within the scope of the present invention.

1‧‧·wheels

2‧‧‧First blade

3‧‧‧second blade

4‧‧‧Support ribs

21‧‧‧First upper curved surface

31‧‧‧Second upper curved surface

41‧‧‧second support rib

42‧‧‧First support rib

Claims (5)

A composite fan air volume enhancement structure of an axial flow fan, the blade includes: a hub and a plurality of first blades, wherein the inner ends of the plurality of first blades are disposed around the hub, and are characterized by: a plurality of second blades are added to the outer end of the blade, and each of the second blades is connected to the first blades at the front and rear positions of the second blade by two supporting ribs; the second blade area is smaller than the first a blade area, and the first blade and the second blade are staggered such that the airflow above the first blade is bent through the second blade into an axial airflow below the first blade. The composite fan air volume enhancement structure of the axial flow fan of claim 1, wherein the two support ribs comprise a first support rib and a second support rib, and an outer end of each of the second blades passes through a support rib connecting an outer end of one of the two first blades at a front and rear position of the second blade, and an outer end of the second blade being flush with an outer end of the first blade connected thereto The inner end of the second vane is coupled to the other of the first vanes by a second support rib. The composite fan air volume enhancement structure of the axial flow fan of claim 1, wherein the second blade and the first blade connected to the outer end thereof maintain a spacing, the pitch width and the first The length of the support ribs matches. The composite fan air volume enhancement structure of the axial flow fan of claim 1, wherein the second blade and the first blade connected to the inner end thereof maintain a space, the interval width of the interval is The second support ribs are matched in length, and the first blade, the second blade, and the second support rib form an enhanced interval of increasing axial airflow over the interval. The composite fan air volume enhancement structure of an axial flow fan according to any one of claims 1 to 4, wherein the first blade is provided with a first surface on the upper and lower opposite surfaces. a curved surface and a first lower curved surface, wherein the second blade is provided with a second upper curved surface and a second lower curved surface on the upper and lower opposite surfaces, and the first and second blades are upper and lower The arc faces remain matched.