A vacuum pump is a gas conveying machine that uses mechanical, physical, chemical, physical and chemical methods to evacuate the container to obtain and maintain a vacuum. It transports gas from an environment below atmospheric pressure to the atmosphere or an environment with the same atmospheric pressure. The function of a vacuum pump is to remove gas molecules from the vacuum chamber, so that the pressure inside the equipment is lower than atmospheric pressure, and to reduce the gas pressure in the vacuum chamber to achieve the required vacuum degree.
In chemical production, vacuum pumps are often used to create a certain degree of vacuum to achieve process operations. For example, under the suction of a vacuum pump, the filtration speed of the solution is accelerated; when separating liquid mixtures, the distillation temperature can be reduced to avoid the coking and decomposition that may occur in high-temperature distillation; the temperature of the drying solid material is reduced and the speed is accelerated; the heat pipe of the heat pipe heat exchanger is evacuated into a vacuum and distilled water is injected to greatly accelerate the heat transfer rate, etc.
Common vacuum pumps include: dry screw vacuum pumps, water ring pumps, reciprocating pumps, sliding valve pumps, rotary vane pumps, Roots pumps and diffusion pumps.
