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Airfoil fan blades and fans

A fan blade and airfoil technology, which is applied in the field of airfoil fan blades and fans, can solve the problems of small fan air volume, high noise, and narrowing of the available range of effective lift, and achieve the effect of large air volume and low noise

Active Publication Date: 2017-11-10
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the above-mentioned disadvantages, the use of reversible wing-shaped fan blades must greatly increase the angle of attack so that the total lift can reach a certain level. In this way, when the total lift is not too large, it is very easy to achieve stall thrust angle, reducing the available range of effective lift
Due to the inherent contradictions or fundamental problems in the use of reversible airfoils, the fans using this airfoil have small air volume and high noise

Method used

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  • Airfoil fan blades and fans
  • Airfoil fan blades and fans
  • Airfoil fan blades and fans

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Embodiment Construction

[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

[0021] Figure 3 to Figure 5 is a schematic structural diagram of the device of the embodiment of the present invention. combine Figure 3 to Figure 5 , the airfoil fan blade, including the hub 1 and several blades 2 evenly arranged along the hub 1, along the axis of the hub 1 as the center to make a circular cross-section, the circular cross-sectional shape of the blade 2 is a symmetrical airfoil shape, the circular cross-section The chord length corresponding to the center line of symmetry is L.

[0022] The thickness of the circumferential section varies along its circumferential direction, and the ratio of the distance from the maximum thickness of the circumferential section to the windward edge of the blade 2 to the chord length L is 0.4-0.6.

[0023] Preferably, the thickness...

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Abstract

The invention discloses a wing type fan blade and a fan. The wing type fan blade comprises a wheel hub and a plurality of blades which are arranged along the periphery of the wheel hub; a circumferential section is formed with an axis of the wheel hub serving as a center of a circle; the circumferential section of the blades is in a symmetrical wing shape; the wing chord length which is corresponding to a symmetrical central line of the circumferential section is L. According to the wind type fan blade, the section shape of the blades is in the symmetrical wing shape, equal air outlet volume in the forward direction and the backward direction is achieved, the air outlet volume is large, and the noise is small.

Description

technical field [0001] The invention relates to a fan, in particular to an airfoil fan blade and the fan. Background technique [0002] Most of the fans in the market currently use conventional fan blades, which can only achieve one-way air blowing. Existing fan blades that can achieve two-way airflow in the front and back are generally designed to have similar shapes on the front and back sides in order to ensure that the two-way air output of the fan blades is equal. Some symmetrical equal-thickness leaf type 1' (such as figure 1 shown) and symmetrical elliptical leaf shape 2' (such as figure 2 Shown) is a common symmetrical airfoil, also known as reversible airfoil. The disadvantage of this design is that due to the upturning of the rear of the fan blade, the pressure distribution on the blade surface produces a negative lift at the rear of the fan blade, and the negative pressure offsets part of the positive lift generated at the front of the fan blade, making the to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D29/38F04D29/32
CPCF04D29/325F04D29/384
Inventor 柳洲贾铌林建文刘伟龙
Owner GREE ELECTRIC APPLIANCES INC