During the filling process of beer, the bottle needs to be evacuated before the filling process, in particular, the production of pure draft beer requires a higher vacuum. Our factory pure raw line wine machine vacuum pump system consists of 6 sets of SIHI coaxial coaxial vacuum pump in parallel, each power 4Kw, in the production process, the start of 6 pumps using incremental (one by one start) , So the technical requirements of six pumps are required, the pump group to normal operation. Vacuum pump group since 2001 frequent failures, often lack of vacuum, vacuum pump motor trip and so on. As of August 2002, 9 pumps (over 40,000 yuan / set) and 8 sets of machinery parts (including pump leaves, distribution plates and mechanical seals, valued at more than 20,000 yuan / set) have been purchased, Shaft repair many times; the degree of vacuum is only -0.06Mpa, can not meet the -0.085Mpa production requirements, seriously affecting the beer quality and production efficiency.