During decarburization processes the vacuum system must operate very long time in a rough pressure range. A competent gas-cooling is essential as the extracted incredibly hot gases would or else overheat the filter and vacuum system.
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 certain vacuum environment. At the same time, the vacuum system used by these industries is certainly continuously increasing, and the vacuum degree is continuously increasing. Moreover, the state’s environmental safety, energy conservation and three wastes discharge to the above-described industries, etc. Certain requirements are more stringent. At present, the existing dry vacuum pumps available, such as screw vacuum pumps and claw vacuum pumps, are unable to meet up with the requirements of oil-free large pumping rate clean vacuum environment proposed by these industries Gas-Cooling Roots Pump china because of the restrictions of pumping swiftness characteristics and structural mechanism.
Because of the shortcomings 
of the existing technology, the technical problem to be solved by the utility model is to supply an all-gas-cooled vacuum system to fulfill the use in a clean vacuum environment with huge oil-free pumping speed.