During decarburization processes the vacuum system needs to operate very long time in a rough pressure range. An efficient gas-cooling is necessary as the extracted popular gases would or else overheat the filter and vacuum system.
With the development of technology and the improvement of product quality in aerospace, energy, iron and steel processing, pharmaceutical and chemical industries, these industries have to obtain a certain vacuum environment. At the same time, the vacuum system utilized by these industries is certainly continuously raising, and the vacuum degree is continuously increasing. Moreover, the state’s environmental protection, energy conservation and three wastes discharge to the Gas-Cooling Roots Pump above-mentioned industries, etc. The requirements are more stringent. At the moment, the existing dry vacuum pumps on the market, such as for example screw vacuum pumps and claw vacuum pumps, cannot meet up with the requirements of oil-totally free large pumping swiftness clean vacuum environment proposed by these industries because of the restrictions of pumping rate characteristics and structural mechanism.
In view of the shortcomings of the existing technology, the technical problem to be solved by the utility model is to provide an all-gas-cooled vacuum system to fulfill the utilization in a clean vacuum environment with huge 
oil-free pumping speed.
