Unpowered fan whose support frame is an airfoil blade

Abstract

The invention discloses a non-powered fan whose support frame is an airfoil blade. The existing unpowered fan will form a strong eddy current behind the plate support frame, which intensifies the degree of turbulence in the flow field. The lower end support frame of the present invention is a plurality of lower end airfoil blades, one end of the lower end airfoil blade is fixed on the bottom of the central shaft, and the other end is fixed on the inner wall of the variable angle pipe diameter; the upper end support frame is a plurality of upper end airfoil blades, and the upper end airfoil One end of the blade is fixed on the positioning sleeve, and the other end is fixed on the inner wall of the cylindrical pipe diameter; the positioning sleeve is supported on the central shaft through bearings; the chord length of the upper airfoil blade is greater than the chord length of the lower airfoil blade; The bottom is welded to the top end surface of the cylindrical pipe diameter, and the top is welded to the top plate of the turbine; the top of the central shaft is supported in the support hole opened by the top plate of the turbine through bearings. The invention improves the flow disturbance of the internal flow field of the fan, weakens the vibration caused by the complicated turbulent flow condition to the fan, and prolongs the service life of the fan.

Description

technical field [0001] The invention belongs to the field of ventilation equipment and relates to a non-powered fan, in particular to a non-powered fan whose support frame is an airfoil blade and has notches. Background technique [0002] Fan is a general-purpose machine with a wide range of applications, ranging from mine ventilation, boiler draft and chemical process, to industrial furnace blast, air conditioning, and building ventilation. Well-designed, manufactured and rationally used ventilators are of great significance to energy saving and noise pollution reduction. [0003] The non-powered ventilator is a commonly used type in the roof ventilator series, which is mainly used in the top floor of the community, hospitals, restaurants, gymnasiums, large factories and other occasions that require roof ventilation. The unpowered fan uses the natural wind speed to drive the turbine of the fan to rotate, and uses the principle of indoor and outdoor air convection to captur...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to solve the current situation that the effective aerodynamic area of ​​the existing non-powered fan is small, the internal support frame of the fan is unreasonable, etc., the resulting internal flow disturbance of the fan is large, the turbulent flow intensity is large, etc., which eventually lead to the problem of low static pressure efficiency, and To solve the problem of noise caused by the vortex area, provide a non-powered fan with optimized flow field parameters, high efficiency, low noise, and airfoil blades as the support frame

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