Small air pump, also called small air pump, small air pump, small air pump and micro vacuum pump, is an inflatable tool that works through motor operation. When the motor is running and pumping air, the valve of the communication device is pushed open by atmospheric pressure, and the gas enters the pump cavity. When a certain volume of air is pumped in, the valve is closed by the air pressure in the pump, and the gas enters the volume. The air pump also uses the principle of atmospheric pressure to inflate. Application fields of air pump: gas sampling, gas circulation, vacuum adsorption, accelerated filtration, automobile vacuum power, etc. , has been widely used in medical, health, scientific research, environmental protection and other fields.