A vacuum pump, as a device that provides negative pressure energy, is of great significance in the production process of tobacco enterprises. Vacuum pumps are mainly applied in the vacuum humidification process in the tobacco industry. Vacuum reoccurrence is a very crucial step in the silk-making process. First, the reoccurrence box is evacuated to a certain pressure, and then water mist is sprayed for reoccurrence after reaching the specified value. Vacuum reoccurrence not only has the functions of loosening, humidifying, and killing pests, but also removes the off-flavors of tobacco leaves, improves the taste of the tobacco, and kills insect eggs. Vacuum reoccurrence is divided into five working stages: initial vacuuming, reoccurrence, pressure retention, re-vacuuming, and emptying.