Axial-flow fan

Abstract

The invention discloses an axial-flow fan which comprises a plurality of blades which are circumferentially arranged apart and a rotary shaft part which is configured in the rotary center of the blades and provided with a shaft hole used for mounting a motor shaft, wherein connecting piece body structures which are used for connecting the root parts of the blades to the rotary shaft part and are connected with one another are arranged at the root parts of the blades; each connecting piece body structure is in a V shape distorted from the air suction side to the air blowing side of the fan, the V-shaped opening part faces to the air blowing side, and the extension line of the V ridge part of the V shape passes through the shaft center of the rotary shaft part and the root part of the front edge of each blade; the blades, the connecting piece body structures and the rotary shaft part are integrated. Therefore, the strength of the connecting piece body structures and the whole fan connecting part is enhanced and the air discharge effect of the central region of the fan is improved.

Description

technical field [0001] The present invention relates to an axial flow fan, more specifically, a hubless axial flow fan. Background technique [0002] See figure 1 and figure 2 , figure 1 and figure 2 It depicts a traditional axial flow fan structure, which is basically composed of two parts, fan blade 1 and fan hub 2, fan blade 1 is installed on the side of hub 2 at a certain angle and in a certain way, and the center of hub 2 is the motor Install shaft hole 3. The hub 2 is generally cylindrical, with a large volume and a high amount of material used. The ratio of its diameter to the outer diameter of the fan is called the hub ratio, which generally ranges from 0.3 to 0.4. Restricted by structural design limitations of traditional axial flow fans and fan strength requirements, the hub 2 has always been an indispensable part in the design of axial flow fans (especially injection molded axial flow fans). Because the diameter of the fan hub 2 is too small, the blade can...

AI Technical Summary

Problems solved by technology

[0005] First: The connecting part between each blade is designed to be formed from the blade and used for blowing air along with the rotation. The connecting part is a thin-walled airfoil structure with a smooth transition from the blade airfoil. It is easy to vibrate, which affects the stability of the fan operation, and the air resistance on the blades will be greater, and the connection part may be easily broken due to force.

[0006] In addition, in order to consider the ease of making molds and the ease of stacking and transporting fans, a plane transition is added to the middle of the connecting part, which further exacerbates the risk of breaking the connecting part

[0007] Second: Since the blade and the connecting part are integrally formed with a thin-walled shape, the connecting part is a relatively flat transition, and the projected area of ​​the connecting part in the center on a plane perpendicular to the fan axis is not much reduced, resulting in The negative effect is the impact on the central wind force, that is, the air outlet efficiency of the connection part is not much improved compared with the traditional axial fan

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