1. What is the function of the vacuum pump? What types of vacuum pumps are generally found in refineries? The vacuum pump is made to create vacuum pressure in the gear or container that operates below ambient atmospheric pressure or high vacuum. Vacuum pumps frequently used in refineries consist of steam aircraft vacuum pumps, water ring vacuum pumps and reciprocating vacuum pumps.
2. What’s the working principle of the steam aircraft vacuum pump? It includes a nozzle, a mixing chamber, an growth chamber, and a pressure store. In operation, water vapor is normally sprayed from the nozzle in to the blending chamber at a higher speed (1200-1500 m/s). At the moment, a specific reducers for greenhouse negative pressure is generated at the nozzle, to ensure that the pumped gas is usually 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 gradually raises along the axis movement until it is discharged above the atmospheric pressure. Due to the continuous function, the gas in the equipment is constantly extracted, thus causing a vacuum (negative pressure) state inside the equipment.
3. What are the features of the steam plane vacuum pump? The steam jet vacuum pump entrains the pumped gas at a higher speed of drinking water vapor, so it has the characteristics of huge pumping capability, high vacuum, simple produce, convenient installation and maintenance, etc. Presently, the vacuum distillation device of the refinery The majority of the vacuum pumps utilized are steam jet vacuum pumps.
4. What is the structure of the water ring vacuum pump? What’s the working theory of the water ring vacuum pump? The water ring vacuum pump comprises a pump casing, an impeller, a water band, a suction chamber, a discharge chamber, and a vent hole.