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    1. Airflow noise
    This is the main source of noise of micro air pumps. When a large amount of gas flows at high speed in a narrow pump, turbulence and eddy currents are generated, and the unsteady flow of these air currents can produce noise. Especially at the intake and exhaust ports, the noise will be more pronounced due to the rapid change in air flow.

    Second, mechanical vibration noise
    When the micro air pump is working, its internal components such as film, bearings, crankshaft and connecting rod will vibrate, and these vibrations will produce mechanical noise. In addition, if the design of the pump body is not reasonable or the manufacturing accuracy is not high, it may also lead to additional vibration and noise.

    Third, electromagnetic noise
    For micro air pumps with motors, electromagnetic noise is also a source that cannot be ignored. This is mainly due to the radial electromagnetic force or the unbalanced magnetic pull in the motor that causes the core to magnetostriction and vibration. When the exciting force resonates with the natural frequency, even if the electromagnetic force is very small, it will produce a lot of noise.

    4. Other factors
    In addition to the above three main sources, the noise of micro air pumps can also be affected by the following factors:

    Pump chamber pressure fluctuations: Periodic fluctuations in the pressure in the pump chamber can cause the pressure of the water flow to the film, the pump chamber and the valve to change rapidly, resulting in noise.
    Cavitation phenomenon: When the water temperature is high and the vacuum degree of the pump is low, the water will vaporize and produce a large number of bubbles. During the compression stroke of the pump, the bubbles burst rapidly, resulting in a high frequency, high impact water crash, resulting in vibration and noise.
    Pipeline system: When the fluid flows rapidly in the pipeline, the periodic pressure pulsation, the noise generated by the friction between the fluid and the pipe wall will penetrate the pipe wall and spread to the outside world. In addition, the vibration of the pump body is transmitted directly to the pipeline, further increasing the noise.