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 vacuum. It transports gas from an environment below atmospheric pressure to the atmosphere or an environment with the same atmospheric pressure. The function of the vacuum pump is to remove gas molecules from the vacuum chamber, so that the pressure inside the equipment is lower than the atmospheric pressure of the machine, reduce the gas pressure in the vacuum chamber, and make it reach the required vacuum degree.
In chemical production, vacuum pumps are often used to create a certain degree of vacuum to realize the process operation process. For example, under the suction of the 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. The electronics industry and the defense industry often require higher vacuum.
Working principle of Roots vacuum pump
The working principle of Roots pump is similar to that of Roots blower. Due to the continuous rotation of the rotor, the pumped gas is sucked from the air inlet into the space v0 between the rotor and the pump housing, and then discharged through the exhaust port. Since the space v0 is fully closed after the air is sucked in, there is no compression or expansion of the gas in the pump chamber. However, when the top of the rotor passes the edge of the exhaust port and the space v0 is connected to the exhaust side, due to the higher gas pressure on the exhaust side, part of the gas will rush back into the space v0, causing the gas pressure to suddenly increase. When the rotor continues to rotate, the gas is discharged out of the pump.
