Design Method of Centrifugal Wind Wheel without Volute

Abstract

The invention discloses a design method of a centrifugal wind wheel without a volute, which includes the design of the outer diameter of the wind wheel and the blade shape design of the blades of the wind wheel. Because the centrifugal wind wheel of the present invention reduces the absolute speed v of the blade by reducing the outer diameter of the blade in the concentration area of ​​the high-speed airflow 绝 =ω·R fan · cosα 2 , so as to eliminate the self-loss area of ​​high-speed airflow and achieve the purpose of noise reduction. The present invention determines the high-speed airflow self-loss area of ​​the wind-wheel-free air duct system through aerodynamic simulation, and proposes a two-stage outer-diameter wind wheel design in a targeted manner. The invention introduces the design of two-stage outer diameter with coefficient ξ, which eliminates the self-loss of high-speed air flow near the air suction port, and can reduce noise without reducing the air volume. The present invention calculates the wind outlet angle α of the best aerodynamic performance through the mathematical derivation of the aerodynamic formula theory 2 and the inlet angle α 1 The combination can achieve the maximum air volume output within the minimum total pressure loss range.

Description

technical field [0001] The invention relates to an air purifier, in particular to a design method of a volute-less centrifugal wind wheel. Background technique [0002] Such as figure 1 As shown, the power mechanism of most household air purifiers generally adopts the volute-less centrifugal wind wheel air duct system, which includes the air duct shell 1' and the wind wheel 2'. The characteristic of the wind wheel air duct system is that it can achieve relative Uniform air outlet and linear air inlet and outlet directions, this structure meets the design requirements of most household air purifiers. Most of the current wind wheel designs are developed based on experience, lacking the guiding design of scientific theories. The outer diameter design of almost all conventional centrifugal wind rotors adopts a single-stage outer diameter design. Through aerodynamic simulation analysis, it can be found that for a wind rotor duct system without a volute, the high-speed airflow o...

AI Technical Summary

Problems solved by technology

The outer diameter design of almost all conventional centrifugal wind rotors adopts a single-stage outer diameter design. Through aerodynamic simulation analysis, it can be found that for a wind rotor duct system without a volute, the high-speed airflow of the wind rotor is on the air outlet section. The distribution of airflow is uneven, and the airflow will appear self-loss high-speed airflow near the suction port, forming the main source of noise

Images