During decarburization processes the vacuum system must operate very long time in a rough pressure range. An efficient gas-cooling is essential as the extracted sizzling gases would otherwise overheat the filter and vacuum program.

With the development of technology and the improvement of product quality in aerospace, electric power, iron and steel processing, pharmaceutical and chemical industries, these industries need to obtain a specific vacuum environment. Simultaneously, the vacuum system used by these industries is definitely Gas-Cooling Roots Pump continuously raising, and the vacuum degree is continuously increasing. Furthermore, the state’s environmental protection, energy conservation and three wastes discharge to the above-talked about industries, etc. The 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 acceleration clean vacuum environment proposed by these industries because of the restrictions of pumping acceleration characteristics and structural system.

Because of the shortcomings of the existing technology, the specialized 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.