The principle of electric suction suction utilizes the

Is the questioner asking what the principle of suctioning with electric suction utilizes? The principle of negative pressure. The principle of electric suction utilizes the principle of negative pressure. Electric sputum suction device mainly relies on the pressure difference of air, when the power supply is turned on, the motor of the sputum suction device will drive the eccentric wheel to rotate, and the air inside the reservoir bottle and the safety bottle will be sucked in from the suction holes and discharged by the exhaust holes, and then rotate again and again, and the air pressure inside the two bottles will become negative, so as to suction out the sputum. The electric suction device is a portable electric medical suction device which is convenient to use in hospital, field or transportation.