A Centrifugal Wind Wheel with Drag Reduction and Noise Reduction

Abstract

The invention discloses a centrifugal wind wheel for drag reduction and noise reduction, which comprises a wheel cover, a plurality of blades, and a wheel disc. The wheel cover and the wheel disc are coaxial and arranged at intervals, and the plurality of blades are arranged between the wheel cover and the wheel disc. A plurality of blades are arranged at intervals in the circumferential direction, the wheel cover includes the inner wall surface connected to the blades, the inner wall surface is provided with a plurality of wheel cover drag reducing grooves or / and wheel cover drag reducing protrusions, and the blade is provided with a plurality of blade drag reducing grooves Or / and blade drag-reducing projections, the wheel cover or / and the outer edge of the wheel disc are provided with a plurality of noise-reducing serrations, and the plurality of noise-reduction serrations are arranged at intervals along the circumferential direction. The beneficial effects obtained by the present invention: the drag-reducing groove or / and the drag-reducing protrusion disrupt the flow state of the airflow in the boundary layer, change the pressure distribution, reduce the flow velocity of the airflow, and obtain the velocity field of the viscous bottom layer in the boundary layer Change, reduce resistance loss along the way, improve efficiency; noise reduction sawtooth cuts eddy current, accelerates eddy current attenuation, reduces turbulent flow intensity and pressure pulsation amplitude, thereby effectively reducing noise.

Description

technical field [0001] The invention relates to the technical field of ventilation, in particular to a centrifugal wind wheel with drag reduction and noise reduction. Background technique [0002] With the development of society and economy, more and more attention is paid to the energy efficiency and noise performance of centrifugal wind turbines used in household appliances. It is very important to reduce the energy loss of centrifugal wind turbines. The resistance loss along the path is an important part of the loss in the fan. After the airflow enters the centrifugal wind wheel, the vortex in the flow field near the wheel cover is relatively strong, and the noise generated is relatively high. [0003] CN109578328B discloses a centrifugal wind wheel and a low-noise backward centrifugal fan including the wind wheel, including a front disc of the wind wheel, a rear disc of the wind wheel and a wind wheel blade arranged between the front disc of the wind wheel and the rear d...

AI Technical Summary

Problems solved by technology

[0003] CN109578328B discloses a centrifugal wind rotor and a low-noise backward centrifugal fan including the wind rotor, including a front disk of the wind rotor, a rear disk of the wind rotor, and wind rotor blades arranged between the front disk of the wind rotor and the rear disk of the wind rotor , the blade pressure surface and blade suction surface of the adjacent wind rotor blades together with the wind rotor front disk and the wind rotor rear disk together form a flow channel area, and the inner ring of the chassis of the wind rotor front disk moves axially away from the The direction of the rear panel of the wind rotor is bent and extended to form the side wall of the front panel, and the side wall of the front panel forms the air inlet of the front panel. A group of continuous protruding structures, each group of continuous protruding structures includes several protruding structures with uniform intervals, although the protruding structures can convect the vortex generated by flow separation near the outlet of the area and the large-scale vortex in the backflow component The structure is destroyed to generate a series of small-scale vortices, which greatly reduces the amplitude of the eddy current noise in the fan noise. The raised structure is completely provided, and the continuous width of the raised structure accounts for about two-thirds of the width of the flow channel. As a result, the flow channel without the raised structure cannot weaken the eddy current to a certain extent, and the noise reduction effect is limited

[0004] CN209687789U discloses a centrifugal wind wheel and a centrifugal fan using it. The centrifugal wind wheel includes a wheel cover made of sheet metal, a wheel disc made of sheet metal, and a number of composite materials installed between the wheel cover and the wheel disc. Wind blades, the several wind blades made of composite materials include a metal skeleton and a plastic shell installed on the blade skeleton, the upper and lower ends of the metal skeleton are respectively connected to the wheel cover and the wheel disc, and the thickness of the plastic shell is H It is changed to improve the air flow. The plastic shell and the metal frame are injection molded into one body. The plastic shell wraps at least a part of the metal frame to ensure the structural strength of the connection and to use the plastic shell to meet the aerodynamic performance requirements of the market. It also has high reliability. Although there are several through holes on the metal skeleton, the function of the several through holes in the metal skeleton is to improve the bonding force between the blade skeleton and the plastic shell, and after the plastic shell wraps the metal skeleton, the surface of the wind blade is a complete surface without through holes , did not achieve the effect of drag reduction and noise reduction

[0005] CN208442048U discloses a diagonal flow fan, an air conditioner indoor unit and an air conditioner. The diagonal flow fan includes a bottom hub, an air guide ring, an end cover and a plurality of blades. The bottom hub includes a connector, and a hub plate is arranged below the connector. The hub plate is Conical frustum shape, the angle between the busbar and the bottom surface of the circular frustum is 10°-20°; the lower end of the blade is fixed on the hub plate, the outer edge of the blade is zigzag, the guide ring is welded on the upper ends of multiple blades, and the end cover is connected to the On the connecting piece; although the serrations on the outer side of the blade can suppress the generation of eddy currents, thereby reducing the noise generated by the operation of the diagonal flow fan, the eddy currents are mainly generated near the outlet of the guide ring, and the serrations on the outer side of the blades cannot Effectively suppress the eddy current near the outlet of the guide ring, and the noise reduction effect is limited

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