Axial flow type fan and fan wheel thereof

Abstract

The invention discloses an axial flow type fan comprising a fan wheel, a fan frame, a permanent magnet and a stator. The fan wheel comprises a hub and a plurality of blades. The hub is provided with a first end part and a second end part. Each of the blades is provided with a first circumferential edge and a second circumferential edge, the first circumferential edge of each blade is connected tothe outer circumferential wall of the hub, and each blade is respectively provided with a first air driving surface and a second air driving surface. The first air driving surface forms at least one first concave part, and the second air driving surface forms at least one second concave part. The fan frame is a hollow frame in which the fan wheel can be arranged. The permanent magnet is connectedto the inner side of the hub of the fan wheel. The stator is connected to the inner side of the fan frame. Therefore, the fan wheel can produce sufficient air quantity no matter the fan wheel rotatesclockwise or anticlockwise, so that the fan wheel can be used in work places requiring double-direction air driving.

Description

technical field [0001] The present invention relates to a heat dissipation fan and its fan wheel, especially a fan wheel with a special structure designed to be suitable for an axial flow fan providing bidirectional wind driving function. Background technique [0002] The existing axial flow fans that are common on the market generally have an outer frame, and components such as a stator and a fan wheel are combined in the outer frame, so that the stator can be used to drive the fan wheel to rotate, and then a predetermined drive can be achieved. Air volume. [0003] The fan wheel of the aforementioned existing axial flow fan is roughly as the new patent of Taiwan Announcement No. 254381 "Fan Wheel Blade Structure of Small Heat Dissipating Fan". Please refer to figure 1 As shown, the existing fan wheel 8 has a circular base plate 81, a hollow ring 82 is formed on the periphery of the circular base plate 81, and several blades 83 are formed on the outer peripheral wall of t...

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Problems solved by technology

Other image 3 As shown, when the control assembly 94 controls the fan wheel 92 to rotate in the forward direction, although the fan wheel 92 can still drive the air flow inside the casing 91 to flow backwards, and further discharge the gas to the casing through the air inlet portion 911 body 91 outside, so that the air flow through the process of the air inlet 911, can simultaneously remove the dust accumulated in the air inlet 911; There is no concave part as the wind-dispelling surface, so the fan wheel 92 cannot generate enough air volume when the fan wheel 92 guides the airflow to pass through the air inlet part 911 in reverse

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