1. What is the role of the vacuum pump? What types of vacuum pumps are generally used in refineries? The vacuum pump is made to create a vacuum in the gear or container that operates below ambient atmospheric pressure or high vacuum. Vacuum pumps typically used in refineries include steam jet vacuum pumps, water ring vacuum pumps and Speed reducer reciprocating vacuum pumps.
2. What is the working theory of the steam aircraft vacuum pump? It contains a nozzle, a mixing chamber, an expansion chamber, and a pressure store. In operation, drinking water vapor is sprayed from the nozzle in to the combining chamber at a higher speed (1200-1500 m/s). At this time, a certain negative pressure is produced at the nozzle, to ensure that the pumped gas can be flushed into the mixing chamber from 
the gas inlet and mixed with water vapor. And get some energy from the water vapor. When the blended gas stream enters the diffuser chamber, the velocity gradually decreases along the axis, and the pressure gradually raises along the axis stream until it really is discharged above the atmospheric pressure. Due to the continuous work, the gas in the equipment is consistently extracted, thus causing a vacuum (negative pressure) state inside the equipment.
3. What are the features of the steam aircraft vacuum pump? The steam jet vacuum pump entrains the pumped gas at a high speed of drinking water vapor, so it has the characteristics of large pumping capacity, high vacuum, simple manufacture, convenient installation and maintenance, etc. Currently, the vacuum distillation unit of the refinery The majority of the vacuum pumps utilized are steam aircraft vacuum pumps.
4. What is the building of the water band vacuum pump? What is the working basic principle of the water ring vacuum pump? The water ring vacuum pump comprises a pump casing, an impeller, a water ring, a suction chamber, a discharge chamber, and a vent hole.