TWM470165U - Fan blades airflow enhancing structure on support frame of axial-flow fan - Google Patents

Description

Fan blade air volume enhancement structure on the support frame of the axial flow fan

The present invention relates to a blade air volume enhancement structure on a support frame of an axial flow fan, and particularly relates to an improved blade structure for effectively increasing the fan air volume.

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 a plurality of blades 11 disposed around the hub 10. When the blade group 1 rotates in the frame, the blade 11 drives the air to generate an axial airflow, and the blade group 1 has a higher rotational speed. The faster the airflow rate and the larger 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.

It is reported that 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. Gas on the lower arc surface 112 The flow velocity is low and the pressure is high. Therefore, most of the airflow will flow 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 will generate two different flow directions at the end of each fan blade 11. And the flow rate of the air flow, generally speaking: the air flow of the lower arc surface 112 is flowing in the axial direction, which is called the axial air flow, and the air flow direction of the upper curved surface 111 is in the tangential direction, so it is called the tangential air flow, but the tangential air flow The flow rate is large, so it will offset the axial airflow and cause eddy current loss, which will result in the fan air volume and wind pressure cannot be effectively improved.

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

The main purpose of the present invention is to provide a blade air volume enhancement structure on a support frame of an axial fan, which is provided with a pressure blade at the outer side of the blade for bending the airflow into an axial airflow. The blade includes: a hub, a plurality of first blades and a support frame; wherein the inner ends of the first blades are disposed around the hub, and the outer ends of the first blades are fixed to the support frame, and the main features of the present invention are: Adding a plurality of second blades to the support frame, the second blade has an area smaller than the first blade, and the second blade and the first blade are staggered along the support frame, so that the first blade is above The airflow is bent through the second vane into the axial airflow below the first vane to achieve an effect of enhancing the axial airflow.

According to the above main feature, the second blade system and the first blade are kept at an appropriate interval, so that the airflow above the first blade can be bent through the interval to flow into the axial airflow below the first blade.

According to the above main feature, the outer side of the first blade is further fixed to the inner edge of the support frame.

According to the above main feature, the second blade is further fixed to the inner edge of the support frame.

According to the above main features, the second blade and the first blade are further staggered along the inner edge of the support frame.

According to the main feature of the foregoing, the proximal end of the first blade (near the support frame) is provided with an incremental groove of a suitable width for corresponding to the second blade, the second blade and the second blade An appropriate spacing is maintained around the measuring groove portion, and the second lower curved surface (windward side) of the second blade is preferably equal or higher or closer to the extension line of the first upper curved surface (the leeward side) of the first blade. The upper airflow of the first upper curved surface of the first blade is bendable by the second blade and flows into the axial airflow below the first blade by a distance between the two blades (the second blade and the first blade).

According to the foregoing main features, the first upper curved surface of each of the first blades is a convex curved surface, and the first lower curved surface is a concave curved surface. When the first blade interferes with the air, according to the law of Bernoulli: airflow Different pressures and flow rates are generated on the first upper arc surface and the first lower arc surface. The flow velocity on the first upper arc surface is higher, the pressure is lower, and the air flow velocity on the first lower arc surface The lower part has a higher pressure. Therefore, the second blade is used to bend the air flow of the second lower curved surface into the first lower curved surface, so that the axial airflow generated by the first lower curved surface can be effectively increased. Its air volume.

1‧‧‧ fan leaves

10‧‧·wheels

11‧‧‧First blade

110‧‧‧Inside

111‧‧‧First upper curved surface

112‧‧‧First lower curved surface

12‧‧‧Support frame

13‧‧‧second blade

131‧‧‧Second upper curved surface

132‧‧‧Second lower curved surface

14‧‧‧Incremental groove

D, D1‧‧‧ spacing

L‧‧‧ Extension line

S‧‧‧ tangent

Figure 1 is a schematic perspective view of a conventional fan blade.

Fig. 2 is a perspective view showing the blade air volume enhancement structure on the support frame of the axial flow fan according to the first embodiment of the present invention.

FIG. 3 is a partially enlarged view showing a second embodiment of the fan blade air volume enhancement structure on the support frame of the axial flow fan according to the first embodiment of the present invention, showing that the second lower arc surface of the second blade is higher than the first blade. The extension of the upper arc.

Fig. 3a is an enlarged view of the extension line and the tangential spacing of the first upper curved surface of the first blade of the third drawing of the creation.

4 is a partially enlarged view showing another second drawing of the blade air volume increasing structure on the support frame of the axial fan according to the first embodiment of the present invention, showing that the airflow above the first blade is bent into the first blade through the second blade. Below.

Fig. 5 is a schematic view showing the use state of the blade air volume increasing structure on the support frame of the axial flow fan according to the first embodiment of the present invention.

Figure 6 is a diagram of the support frame of the axial flow fan of the second embodiment of the present invention. A three-dimensional diagram of the fan blade air volume enhancement structure.

Figure 7 is a partially enlarged view showing a sixth embodiment of the blade air volume enhancement structure on the support frame of the axial flow fan of the second embodiment of the present invention, showing the second lower curved surface of the second blade and the first upper surface of the first blade Keep the arc surface at an appropriate spacing.

Figure 8 is a schematic view showing the state of use of the blade air volume enhancement structure on the support frame of the axial flow fan of the second embodiment of the present invention.

In view of the above, the preferred embodiments and the drawings are used to illustrate the technical means and effects of the present invention.

Please refer to FIG. 2 to FIG. 5 , which is a perspective view of the blade air volume enhancement structure on the support frame of the axial flow fan according to the first embodiment of the present invention. FIG. 3 is a partially enlarged view showing a second embodiment of the fan blade air volume enhancement structure on the support frame of the axial flow fan according to the first embodiment of the present invention, showing that the second lower arc surface of the second blade is higher than the first blade. The extension of the upper arc. Fig. 3a is an enlarged view of the extension line and the tangential spacing of the first upper curved surface of the first blade of the third drawing of the creation. 4 is a partially enlarged view showing another second drawing of the blade air volume increasing structure on the support frame of the axial fan according to the first embodiment of the present invention, showing that the airflow above the first blade is bent into the first blade through the second blade. Below. Fig. 5 is a schematic view showing the use state of the blade air volume increasing structure on the support frame of the axial flow fan according to the first embodiment of the present invention.

The first embodiment of the present invention provides a blade air volume enhancement structure on a support frame of an axial flow fan, the blade 1 includes at least: a hub 10, a plurality of first blades 11 and a support frame 12; wherein the first blade 11 includes a first upper curved surface 111 and a first lower curved surface 112 on the upper and lower corresponding surfaces (the upper and lower sides of the embodiment are shown in the direction of the drawing, and the first upper curved surface is The convex arc surface, and the first lower arc surface is a concave arc surface). The inner end of the first blade 11 is disposed around the hub 10 (as shown in FIG. 2), and the outer end of the first blade 11 is fixed to the support frame 12 (in the embodiment, the support frame is fixed) The inner edge), when the fan blade 1 rotates, the first blade 11 around the hub 10 drives the air to generate an axial airflow, and the higher the rotational speed of the blade 1 is, the faster the airflow rate is, and relatively, the generated The greater the amount of wind.

The main feature of the present invention is that the support frame 12 is provided with a plurality of second blades 13 (in this embodiment, the inner edge of the support frame is fixed), and the second support 13 is fixed on the support frame 12, and The second blade 13 includes a second upper curved surface 131 and a second lower curved surface 132 on the upper and lower corresponding surfaces (the upper and lower sides of the embodiment are shown in the direction of the drawing, and the second The upper curved surface is a convex curved surface, and the second lower curved surface is a concave curved surface. Further, the second blade 13 has an area smaller than the first blade 11 , and the second blade 13 and the first blade 11 are The support frame 12 is staggered along the support frame 12 (in this embodiment, is fixed to the inner edge of the support frame), so that the airflow above the first blade 11 is bent through the second blade 13 and flows into the axial direction below the first blade 11. In the airflow, the effect of increasing the axial air volume is further achieved. In more detail, the proximal end of each of the first blades 11 (near the support frame) is provided with an incremental groove portion 14 of a suitable width (as shown in FIG. 3). Shown), and the second blade 13 is added to the support frame 12 corresponding to the incremental groove portion 14, and the second blade 13 is provided above and below The second upper curved surface 131 and the second lower curved surface 132 of the corresponding surface (the upper and lower sides of the embodiment are shown in the direction of the drawing surface, and the second upper curved surface is the convex curved surface, and the The second lower curved surface is a concave curved surface) (the second blade system in this embodiment is similar in shape to the incremental groove portion, and the area is approximately equal in size), and at the same time, the second blade 13 is located adjacent to the incremental groove. At the portion 14, and the second vane 13 and the incremental groove portion 14 are maintained at an appropriate distance D (as shown in FIG. 3). When the blade 1 rotates, the first vanes 11 located around the hub 10 When the air is caused to generate an axial airflow, the airflow on the first upper curved surface 111 of each of the first blades 11 is bent by the second blade 13 and flows into the first lower curved surface 112 of the first blade 11 from the spacing D. The resulting axial flow (as shown in Figures 4 through 5), in addition to increasing the amount of axial airflow, while effectively reducing the eddy current losses between the tangential flow and the axial flow.

Referring again to Figures 3, 3a to 4, the second lower curved surface 132 of the second blade 13 of the present invention is to maintain a proper tangent to the extension line L of the first upper curved surface 111 of the first blade 11. S (as shown in Fig. 3a, but the second lower curved surface of the second blade may be equal or higher or closer to the extension line of the first upper curved surface of the first blade), the first blade 11 The air flow of the first upper curved surface 111 can pass through the second blade The second lower curved surface 132 of the 13 is bent and flows into the axial airflow formed by the spacing D and the tangential distance S into the lower side of the first blade 11, that is, the creation uses the incremental groove portion 14 and the second The blade 13 guides the air volume of the first upper curved surface 111 of the first blade 11 to the first lower curved surface 112 and makes it an axial airflow, thereby achieving the effect of effectively enhancing the axial air volume (eg, 3, 3a). As shown in Figure 4).

The windward surface of the first blade 11 (the first lower curved surface of the first blade) is a concave curved surface, and the leeward surface (the first upper curved surface of the first blade) is a convex curved surface. When the blade 1 rotates, the first blades 11 perturb the surrounding air, according to the law of Bernoulli: P + 1/2 ρ V ² = const, the airflow will be on the first upper curved surface 111 and the first The lower curved surface 112 generates different pressures and flow rates. Generally, the flow velocity of the first upper curved surface 111 is necessarily higher, the relative pressure is lower, and the flow velocity of the first lower curved surface 112 is lower. The relative pressure is relatively high. Based on the above, most of the airflow flows through the first upper curved surface 111 of the first blade 11, but the axial airflow actually generated by the blade 1 mainly comes from the first blade. The lower curved surface 112 is based on the above principle: the creation mainly uses the second blade 13 to bend the majority of the first upper curved surface 111 of the first blade 11 into the second lower curved surface 132. The axial airflow generated by the first lower curved surface 111 includes the air flow of the first upper curved surface 111 to effectively increase the axial airflow. Flow rate (e.g., shown in FIG. 5).

Please refer to FIGS. 6 to 8. FIG. 6 is a perspective view showing the blade air volume increasing structure on the support frame of the axial flow fan according to the second embodiment of the present invention. Figure 7 is a partially enlarged view showing a sixth embodiment of the blade air volume enhancement structure on the support frame of the axial flow fan of the second embodiment of the present invention, showing the second lower curved surface of the second blade and the first upper surface of the first blade Keep the arc surface at an appropriate spacing.

Figure 8 is a schematic view showing the state of use of the blade air volume enhancement structure on the support frame of the axial flow fan of the second embodiment of the present invention.

The second embodiment of the present invention provides a blade air volume enhancement structure on a support frame of an axial flow fan, the blade 1 includes at least: a hub 10, a plurality of first blades 11 and a support frame 12; wherein the first blade 11 includes a first upper curved surface 111 and a first lower curved surface 112 on the upper and lower corresponding surfaces (on the present embodiment, The lower side is shown in the direction of the drawing, and the first upper curved surface is a convex curved surface, and the first lower curved surface is a concave curved surface). The inner end 110 of the first blade 11 is disposed around the hub 10 (as shown in FIG. 6), and the outer ends of the first blades 11 are fixed to the support frame 12 (in the embodiment, the support is fixed) The main feature of the present invention is that the support frame 12 is provided with a plurality of second blades 13 (as shown in FIG. 7) (in this embodiment, the inner edge of the support frame is fixed), and The second blade 13 includes a second upper curved surface 131 and a second lower curved surface 132 on the upper and lower corresponding surfaces (the upper and lower sides of the embodiment are shown in the direction of the drawing, and similarly, The second upper curved surface is a convex curved surface, and the second lower curved surface is a concave curved surface, and the second blade 13 has an area smaller than the first blade 11, and the second blade 13 and the first blade 11 are further The two are staggered along the support frame 12 (in this embodiment, the inner edge of the support frame is fixed), so that the airflow above the first blade 11 is bent through the second blade 13 and flows into the axis below the first blade 11. The effect of increasing the axial air volume in the airflow; the biggest difference between the second embodiment of the present creation and the first embodiment is that the second embodiment mainly uses The requirement is that the rotation speed is higher or the air volume is larger. Therefore, in the second embodiment, the interval D1 between the second blade 13 and the first blade 11 is much larger than that of the first embodiment (as shown in FIG. 7) due to the interval. If the D1 is large, it is not necessary to additionally add an incremental groove portion, thereby, when the blade 1 rotates the first blades 11 to drive the air to generate an axial airflow, a large amount of the first upper arc surface of each of the first blades 11 The ground airflow is bent by the second vane 13 and flows into the axial airflow formed by the first lower curved surface of the first vane 11 by the spacing D1 (as shown in Fig. 8) to effectively increase the airflow of the axial airflow.

The present invention has been described in more detail by the above-described preferred embodiments, but the present invention is not limited to the above-exemplified embodiments, and various changes and modifications to the structures are still within the scope of the technical idea disclosed in the present disclosure. It belongs to the scope of this creation.

1‧‧‧ fan leaves

10‧‧·wheels

11‧‧‧First blade

110‧‧‧Inside

111‧‧‧First upper curved surface

112‧‧‧First lower curved surface

12‧‧‧Support frame

13‧‧‧second blade

14‧‧‧Incremental groove

Claims (10)

A blade air volume enhancement structure on a support frame of an axial flow fan, the blade includes: a hub, a plurality of first blades, and a support frame; wherein an inner end of the first blades is disposed around the hub, and the The outer side of the first blade is fixed to the support frame, and the main feature is that a plurality of second blades are added to the support frame, the second blade has an area smaller than the first blade, and the second blade and the second blade A blade is staggered along the support frame, whereby the airflow above the first blade is bent into the axial airflow below the first blade by the second blade to achieve an effect of enhancing the axial air volume. The blade air volume enhancement structure on the support frame of the axial flow fan according to claim 1, wherein the second blade system and the first blade are to be properly spaced. The fan air volume enhancement structure on the support frame of the axial flow fan according to the first aspect of the invention, wherein the outer end of the outer side of the first blade is provided with an incremental groove portion of a proper width for The second vane should be maintained with a suitable spacing around the groove. The blade air volume enhancement structure on the support frame of the axial flow fan according to claim 3, wherein the second blade system is similar in shape to the incremental groove portion, and the area sizes are approximately equal. The blade air volume enhancement structure on the support frame of the axial flow fan according to the first aspect of the patent application, wherein the first blade includes a first upper curved surface on the upper and lower corresponding surfaces and a first lower surface Curved surface. The blade air volume enhancement structure on the support frame of the axial flow fan according to claim 5, wherein the second blade includes a second upper curved surface and a second lower surface on the upper and lower opposite surfaces. Curved surface. The blade air volume enhancement structure on the support frame of the axial flow fan according to claim 6, wherein the second lower arc surface of the second blade is equal to or higher than or close to the first surface of the first blade The extension of the curved surface. a blade air volume enhancement structure on a support frame of an axial flow fan according to claim 7, wherein the second lower surface of the second blade and the first blade are An extension line of the upper arc surface maintains an appropriate tangential distance. The blade air volume enhancement structure on the support frame of the axial flow fan according to the first aspect of the invention, wherein the outer side end of the first blade is fixed to an inner edge of the support frame. A blade air volume enhancement structure on a support frame of an axial flow fan according to claim 1, wherein the second blade is fixed to an inner edge of the support frame.