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 or else overheat the filter and vacuum program.
With the development of technology and the improvement of item quality in aerospace, energy, iron and steel digesting, pharmaceutical and chemical industries, these industries have to obtain a particular vacuum environment. Simultaneously, the vacuum system used by these industries can be continuously raising, and the vacuum level is continuously increasing. Furthermore, the state’s environmental security, energy conservation and three wastes discharge to the above-mentioned 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 up with the requirements of oil-totally free large pumping Gas-Cooling Roots Pump quickness clean vacuum environment proposed by these industries due to the restrictions of pumping swiftness characteristics and structural system.
Because of the shortcomings of the prevailing technology, the technical problem 
to be solved by the utility model is to provide an all-gas-cooled vacuum system to satisfy the use in a clean vacuum environment with large oil-free pumping speed.