During decarburization processes the vacuum system needs to operate long time in a rough pressure range. A competent gas-cooling is essential as the extracted hot gases would or else overheat the Gas-Cooling Roots Pump 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 chemical industries, these industries need to obtain a certain vacuum environment. Simultaneously, the vacuum system utilized by these industries is certainly continuously raising, and the vacuum degree is continuously increasing. Moreover, the state’s environmental safety, energy saving and three wastes discharge to the above-pointed out industries, etc. Certain requirements are more stringent. At present, the existing dry vacuum pumps in the marketplace, such as for example screw vacuum pumps and claw vacuum pumps, cannot meet the requirements of oil-totally free large pumping swiftness clean vacuum environment proposed by these industries due to the restrictions of pumping swiftness characteristics and structural mechanism.

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 use in a clean vacuum environment with huge oil-free pumping speed.