Unpowered draught fan with support frames as wing-shaped blades

Abstract

The invention discloses an unpowered draught fan with support frames as wing-shaped blades. According to an existing unpowered draught fan, strong vortexes will be formed behind plate support frames, and the turbulence degree of a flow field is intensified. The lower-end support frame of the unpowered draught fan is formed by multiple lower-end wing-shaped blades, one end of each lower-end wing-shaped blade is fixed to the bottom of a center shaft, and the other end of each lower-end wing-shaped blade is fixed to the inner wall of an angle-changing pipe diameter; the upper-end support frame of the unpowered draught fan is formed by multiple upper-end wing-shaped blades, one end of each upper-end wing-shaped blade is fixed to a positioning sleeve, and the other end of each upper-end wing-shaped blade is fixed to the inner wall of a cylinder pipe diameter; the positioning sleeve is supported to the center shaft through a bearing; the chord length of the upper-end wing-shaped blades is larger than the chord length of the lower-end wing-shaped blades; the bottoms of the multiple air cutting blades are welded to the end face of the top of the cylinder pipe diameter, and the tops of the multiple air cutting blades and a turbine top plate are welded; and the top of the center shaft is supported into a bearing hole formed in the turbine top plate through a bearing. By means of the unpowered draught fan, flow disturbance of the flow field in the draught fan is improved, vibration of complex turbulence conditions on the draught fan is weakened, and the service life of the draught fan is prolonged.

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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