Biodiesel distillation roots pendular ring vacuum unit

The utility model relates to a vacuum unit, especially a biodiesel distillation roots pendular ring vacuum unit, it includes comdenstion water replenishment portion, pump package and air intake part, air intake part includes shell and tube heat exchanger, shell and tube heat exchanger's top left side is equipped with the gas outlet just has real empty can through the pipeline intercommunication in this gas outlet, real empty can passes through the pipe connection pump package, the pump package includes unit intake pipe, first pump, second pump, third pump and fourth pump, establishes ties in proper order through the pipeline, and the cooling tube of fourth pump communicates comdenstion water replenishment portion, comdenstion water replenishment portion is including cooling tower and booster pump, the by freezing tower is made low temperature cold water and is cooled off water ring formula pump, effectively improves the evacuation efficiency of water ring formula pump and whole vacuum unit to the effective re