A non-volute centrifugal fan with drag-reducing groove

Abstract

The invention discloses a novel volute-less centrifugal ventilator with resistance reduction grooves. The novel volute-less centrifugal ventilator with the resistance reduction grooves comprises a wheel disc, a wheel cover, blades and the resistance reduction grooves; the blades are welded between the wheel cover and wheel disc, the blades are uniformly distributed around the axial line of the wheel cover, the resistance reduction grooves are milled after processing the blades, the wheel disc is disc-shaped, and a flange structure is arranged at the middle for mounting a motor shaft; the sections of the blades are the same curves, the parts in contact with the wheel cover conform to the molded line of the wheel cover, the resistance reduction grooves are rectangular, from 50% part of the molded line of each blade, the resistance reduction grooves are uniformly distributed on the pressure surfaces of the blades from the blade inlet to the outlet, there are 12 resistance reduction grooves, the gap between the resistance reduction grooves is 0.21 delta, each resistance reduction groove is 0.125 delta in depth and 0.25 delta in width, delta is the blade thickness, and the length direction of each resistance reduction groove runs through the whole blade. The novel volute-less centrifugal ventilator with the resistance reduction grooves reduces turbulent dissipation so as to reduce resistance, and the novel volute-less centrifugal ventilator with the resistance reduction grooves is capable of reducing the power consumption and improving the efficiency of the volute-less centrifugal ventilator.

Description

technical field [0001] The invention belongs to the technical field of general equipment, and in particular relates to a centrifugal fan without a volute with a drag reducing groove. [0002] technical background [0003] Centrifugal fans, as a general-purpose machine, are widely used in many fields such as industry, agriculture, mining, chemical industry, and building ventilation. Data show that the fans currently used in my country generally consume too much energy, and only industrial fans consume Electricity accounts for 12% of the total electricity in the country, so designing high-efficiency ventilators is of great significance to saving energy resources. [0004] As a new type of ventilator, the non-volute ventilator is widely used in foreign countries, and it is usually used in fan-wall combined air-conditioning units and roof ventilation in China. Since the volute fan has no volute, the kinetic energy at the outlet of the impeller is not converted into static pressur...

AI Technical Summary

Problems solved by technology

[0005] The root cause of the flow loss in the operation of the centrifugal fan is the viscosity of the fluid. When the air flow passes through the blade surface, due to the frictional resistance of the blade surface due to the viscosity, flow loss occurs, which in turn affects the performance of the fan.

At present, there is not much research on reducing the frictional resistance of the blade surface

Images