Vacuum pump

Working Principle Rotary vane vacuum pumps rely on an eccentric rotor to drive vanes that rotate closely along the inner wall of the pump chamber. The vanes divide the chamber into sealed compartments with periodically changing volumes. When the compartment volume increases, gas is drawn in from the container being evacuated; when the volume decreases, the gas is compressed and discharged through the exhaust port. Continuous operation allows the pump to steadily remove gas from the sealed space, creating a vacuum. Water ring vacuum pumps use a rotating impeller to agitate the working water, forming a ring-shaped water seal. The volume between the impeller blades and the water ring cyclically increases and decreases to complete suction and exhaust. The water seal isolates the atmosphere, enabling the pump to handle water vapor and condensable gases without easily damaging the pump body. Roots vacuum pumps rely on a pair of counter-rotating, non-contact rotors to transport gas, commonly used in high-vacuum booster systems for enhanced gas extraction. Multi-stage configurations can achieve ultra-high negative pressure environments. Application Fields 1. Packaging industry: Food sealing, vacuum bag packaging, and electronic product vacuum packaging utilize negative pressure to achieve material sealing, preservation, and moisture-proof packaging. 2. Chemical and pharmaceutical industries: Negative pressure distillation in reactors, vacuum drying of materials, and degassing and purification of pharmaceutical liquids lower the boiling point of materials, enabling low-temperature processing to prevent raw material degradation. 3. Metallurgical heat treatment: Vacuum extraction in metal smelting furnaces and heat treatment chambers isolates air to prevent high-temperature oxidation of workpieces. 4. Laboratory instruments: Small vacuum pumps are used in chromatographs, freeze dryers, and vacuum drying ovens to provide the required negative pressure environment for experiments. 5. Industrial adsorption and conveying: Vacuum loaders use negative pressure for material suction, stone and glass suction cups for lifting, and printing machines for fixing paper via adsorption.