Vibrating air pump noise solution

The swirling air pump should pay attention to the following matters in noise reduction and noise reduction:

1. The serrated structure of the swirling air pump on the side of the inlet and outlet of the impeller allows the laminar airflow layer on the blade to be converted into turbulent flow earlier, thus avoiding the unstable wave in the laminar boundary layer leading to vortex separation. Eddy current separation, noise reduction.

2. The acoustic resonator is installed at the scroll tongue of the vortex type air pump. When the acoustic wave is transmitted to the resonator, the small hole diameter and the gas in the cavity act as the acoustic wave to move back and forth, causing part of the sound energy to be lost due to heat loss. Reduced.

3. The inclined tongue of the volute tongue can reduce the periodic pulsation velocity of the cascade gas flow of the vortex air pump impeller and the interaction of the volute tongue to generate rotational noise. Because the area of ​​the pulsating aerodynamic force with the same phase is smaller, the radiation noise is also reduced.

4. In the case of wind pressure with the same air volume, a strong forward vane is used for the vortex type air pump, and the multi-blade impeller is beneficial for increasing the aerodynamic load of the cascade. The circumferential speed of the impeller vane circle can significantly reduce the fan noise.

5. After the cascade, the velocity and pressure of the air flow are not evenly distributed. When the airflow and the blades move relative to each other, the tongue of the scroll at the air outlet of the moving leaf will interact with the volute tongue to generate noise, so it is appropriate to take the front of the wind tongue. The radius thus reduces the rotational noise and eddy current noise of the vortex air pump.