TWM529077U - Primary fan blade capacity enhancement structure of axial flow fan - Google Patents

Description

Fan blade air volume enhancement structure on the main fan blade of an axial fan

The present invention relates to the field of mechanical fan heat equipment, and more particularly to a blade air volume enhancement structure on a main fan blade 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 disposed on the hub. 10 is composed of a plurality of blades 11 around the fan blade group 1 when the fan blade group 1 rotates in the fan frame, and the fan blade 11 drives the air to generate an axial airflow. The higher the rotation speed of the blade group 1 is, the faster the airflow velocity 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 the disturbing airflow The airflow generates different pressures and flow rates on the upper curved surface 111 and the lower curved surface 112 respectively. According to the Bernoulli airflow, the airflow velocity on the upper curved surface 111 is higher and the pressure is lower. The flow velocity on the lower curved surface 112 is lower and the pressure is higher. Therefore, most of the airflow flows into the upper curved surface of the low pressure, so that the airflow flowing into the upper curved surface 111 and the lower curved surface 112 is applied to each of the blades 11 The tail end generates two streams of different flow directions and flow rates. Generally, the air flow of the lower arc surface 112 flows toward the axial direction, so it is called the axial air flow, and the air flow direction of the upper arc surface 111 is tangentially oriented, so it is called the tangent airflow. However, the tangential gas flow rate is large, so that the eddy current loss is generated by offsetting the axial velocity airflow, and the fan air volume and the wind pressure cannot be effectively improved.

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 the subject of the creation.

The technical problem to be solved in this creation is to provide a blade air volume enhancement structure on the main fan blade of the axial flow fan according to the defects existing in the existing design technology. The fan structure has small noise, stable rotation, 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 blade air volume enhancement structure on a main fan blade of an axial flow fan, comprising a hub and a plurality of first blades, wherein the first blade is located on the upper blade a first upper curved surface and a first lower curved surface of the lower two corresponding surfaces, wherein the inner ends of the plurality of first blades are fixed to the hub; and each of the plurality of first blades is provided with an increase a groove portion, a second blade connected to the first blade and spaced apart from the first blade, and a second blade on the second blade a second upper curved surface and a second lower curved surface, and the second blade area is smaller than the first blade, so that the airflow above the first blade is bent through the incremental groove and the second blade Axial airflow below the first blade in.

As a further explanation of the above technical solution, in the above technical solution, the second lower curved surface of the second blade and the extension line of the first upper curved surface of the first blade maintain a line spacing.

In the above technical solution, the second lower curved surface of the second blade starts from the first upper curved surface of the first blade.

In the above technical solution, the second blade matches the shape and size of the incremental groove portion.

In the above technical solution, each of the second blades is disposed at a position of the first plurality of blades that are identical or different.

In the above technical solution, a plurality of the second blades disposed at different positions of the plurality of first blades are arranged in an array, and a plurality of second blade groups are formed along the circumference of the hub. .

In the above technical solution, each of the second blade sets includes at least three of the second blades, and the second blade of each of the second blade sets is on the first blade It is arranged in a stepped manner.

The utility model has the beneficial effects that the utility model utilizes 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 air volume of the fan. The fan noise is small and the rotation is stable.

1‧‧·wheels

2‧‧‧First leaf

3‧‧‧second leaf

4‧‧‧Incremental groove

S‧‧‧ tangent

D‧‧‧ spacing

1 is a schematic perspective view of a conventional fan.

Fig. 2 is a perspective view showing the structure of the first embodiment of the present invention, and the wind direction arrow indicates the direction of the wind.

Figure 3 is an enlarged schematic view of a portion A of Figure 2.

4 is a schematic perspective view of a second embodiment of the present invention.

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

Please refer to FIG. 2-3 for the first embodiment of the present invention. The blade air volume enhancement structure on the main fan blade of the axial flow fan includes a hub 1 and a plurality of first blades 2, and the first fan The leaf 2 is provided with a first upper curved surface (not shown) on the upper and lower corresponding surfaces and a first lower curved surface (not shown), and the inner ends of the first first blades 2 Fixed to the hub 1; an incremental groove portion 4 is defined in each of the plurality of first blades 2, and the incremental groove portion 4 is matched and disposed to be connected to the first blade 2 and held a second blade 3 of a spacing D, wherein the second blade 3 is provided with a second upper curved surface (not shown) on the upper and lower corresponding surfaces and a second lower curved surface (not shown) And indicating that the area of the second blade 3 is smaller than the first blade 2, and the airflow above the first blade 2 is bent and flows into the first blade through the incremental groove 4 and the second blade 3. 2 in the axial airflow below.

Wherein, the second lower curved surface of the second blade 3 and the extension line of the first upper curved surface of the first blade 2 maintain a line spacing S; the second lower arc of the second blade 3 The face begins with a first upper curved surface of the first blade 2; the second blade 3 matches the shape and size of the incremental groove 4.

Each of the second blades 3 is disposed at a position different from the position of the plurality of first blades 2, and the positions of the plurality of first blades 2 are different from each other. The fan blades 3 are arranged in an array, and a plurality of sets of second blades 3 are formed along the circumference of the hub 1; each of the second blades 3 includes at least 3 of the second blades 3, and Each of the second fan blades 3 The second blades 3 are arranged in a stepped manner on the first blade 2 .

Referring to FIG. 4, a second embodiment of the present invention is shown, wherein each of the second blades 3 is disposed at a position corresponding to the plurality of first blades 2, that is, all the second blades 3 are in each The positions on a first blade 2 are identical and form a concentric circle with the hub 1.

The present invention uses the second blade 3 to bend the airflow flowing through the first upper arc surface of the first blade 2 into the second lower arc surface, so that the axial airflow generated by the lower arc surface can effectively increase the air volume of the fan. . The fan noise is small and the rotation is stable.

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 leaf

3‧‧‧second leaf

4‧‧‧Incremental groove

Claims (7)

A blade air volume enhancement structure on a main fan blade of an axial flow fan, comprising a hub and a plurality of first blades, wherein the first fan blade is provided with a first upper arc surface on the upper and lower opposite surfaces and a first a curved surface, wherein the inner ends of the first plurality of first blades are fixed to the hub, wherein each of the plurality of first blades is provided with an incremental groove portion matching the incremental groove a second blade connected to the first blade and maintaining a spacing, wherein the second blade is provided with a second upper surface and a second lower surface corresponding to the upper and lower surfaces a curved surface and the second blade area is smaller than the first blade, so that the airflow above the first blade is bent into the axial airflow below the first blade through the incremental groove portion and the second blade in. The blade air volume enhancement structure on the main fan blade of the axial flow fan according to claim 1, wherein the second lower arc surface of the second blade and the first upper arc of the first blade The extension of the face maintains all line spacing. The blade air volume enhancement structure on the main fan blade of the axial flow fan according to claim 1, wherein the second lower arc surface of the second blade starts from the first of the first blade Curved surface. The blade air volume enhancement structure on the main fan blade of the axial flow fan according to claim 1, wherein the second blade matches the shape and size of the incremental groove portion. The blade air volume enhancement structure on the main fan blade of the axial flow fan according to claim 1, wherein each of the second blades is disposed at the position of the plurality of first blades to be identical or Not the same. The blade air volume enhancement structure on the main fan blade of the axial flow fan according to claim 5, wherein the positions of the plurality of first blades are different for each of the second blades Arranged in an array, and a plurality of sets of second blade sets are formed along the circumference of the hub. A blade air volume enhancement structure on a main fan blade of an axial flow fan according to claim 6, wherein each of the second blade group includes at least three of the second blades, and each The second blade of the second blade group is arranged in a stepwise manner on the first blade.