Design method for non-volute centrifugal wind wheel

Abstract

The invention discloses a design method for a non-volute centrifugal wind wheel. The design method includes outer diameter design of the wind wheel and blade profile design of a wind wheel blade. Dueto the fact that the absolute speed v which is equal to omega*Rfan*cosalpha2 of the blade is reduced by reducing the outer diameter of the blade in a high-speed airflow concentrated area in the centrifugal wind wheel, a self-loss area of high-speed airflow is eliminated, and the purpose of noise reduction is achieved. By means of the design method, the self-loss area of the high-speed airflow of an air way system of the non-volute wind wheel is determined through pneumatics simulation, and two-stage outer diameter type wind wheel design is put forwards in a targeted manner. The second-level outer diameter design of the coefficient epsilon is introduced, the self loss of the high-speed airflow near an air suction opening is eliminated, and the noise can be reduced on the premise that the air volume is not reduced. By means of the design method for the non-volute centrifugal wind wheel, due to mathematical derivation on a pneumatic formula theory, the combination of an air outlet angle alpha 2 and the air inlet angle alpha 1 of the best pneumatic performance is calculated, and the maximum air volume output is achieved in 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] like 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 of t...

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

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