A negative pressure vacuum pump works by mechanically or physically extracting gas molecules from a sealed space, creating a negative pressure environment below atmospheric pressure within the pump chamber. Its core principle is the high-speed rotation or reciprocating motion of moving parts such as rotors, blades, or vortices, which draws gas in through the inlet, compresses it, and then discharges it through the outlet, achieving a vacuum environment. The specific process can be divided into the following three steps:
Intake Stage: Gas enters the pump chamber through the intake port (e.g., 40mm diameter). At this time, the rotor or blades move, increasing the chamber volume and reducing the internal pressure.
Compression Stage: As the moving parts continue to rotate (e.g., 1470 RPM), the gas is compressed to the discharge pressure (e.g., 32 mbar water vapor pressure).
Discharge Stage: The compressed gas is discharged through the discharge valve. Simultaneously, the oil lubrication system (e.g., UL19 oil type) ensures sealing and heat dissipation (operating temperature 12-40℃).