1. What is the function of the vacuum pump? What kinds of vacuum pumps are generally used in refineries? The vacuum pump is made to create a vacuum in the gear or container that works below ambient atmospheric pressure or high vacuum. Vacuum pumps commonly used in refineries include steam aircraft vacuum pumps, water ring vacuum pumps and reciprocating vacuum pumps.
2. What’s the working basic principle of the steam jet vacuum pump? It consists of a nozzle, a mixing chamber, an expansion chamber, and a pressure wall plug. In operation, drinking water vapor is definitely sprayed from the nozzle into the mixing chamber at a high speed (1200-1500 m/s). At the moment, a specific negative pressure is produced at the nozzle, so that the pumped gas is flushed into the mixing chamber from the gas inlet and mixed with water vapor. And get some good energy from the drinking water vapor. When the mixed gas stream enters the diffuser chamber, the velocity gradually decreases along the axis, and the pressure steadily boosts along the axis flow until it is discharged above the atmospheric pressure. Due to the continuous function, the gas in the equipment is consistently extracted, thus causing vacuum pressure (negative pressure) state within the equipment.
3. What are the characteristics of the steam plane vacuum pump? The steam jet vacuum pump entrains the pumped gas at a high speed of water vapor, so it gets the characteristics of large pumping capacity, high vacuum, simple manufacture, convenient installation and maintenance, etc. Presently, the vacuum distillation device of the Gearbox refinery Most of the vacuum pumps utilized are steam plane vacuum pumps.
4. What is the construction of the water band vacuum pump? What is the working basic principle 
of the water ring vacuum pump? The water ring vacuum pump is composed of a pump casing, an impeller, a water ring, a suction chamber, a discharge chamber, and a vent hole.