During decarburization processes the vacuum system needs to operate very long time in a tough pressure range. An efficient gas-cooling is necessary as the extracted warm gases would otherwise overheat the filter and vacuum program.

With the development of technology and the improvement of item quality in aerospace, electric power, iron and steel processing, pharmaceutical and Gas-Cooling Roots Pump chemical industries, these industries need to obtain a certain vacuum environment. Simultaneously, the vacuum system utilized by these industries is definitely continuously increasing, and the vacuum degree is continuously increasing. Moreover, the state’s environmental protection, energy saving and three wastes discharge to the above-talked about industries, etc. Certain requirements are more stringent. At present, the existing dry vacuum pumps available, such as for example screw vacuum pumps and claw vacuum pumps, are unable to meet the requirements of oil-free large pumping quickness clean vacuum environment proposed by these industries due to the restrictions of pumping quickness characteristics and structural system.

Because of the shortcomings of the existing technology, the specialized problem to be solved by the utility model is to provide an all-gas-cooled vacuum system to satisfy the utilization in a clean vacuum environment with large oil-free pumping speed.