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During decarburization processes the vacuum Gas-Cooling Roots Pump system needs to operate long time in a tough pressure range. A competent gas-cooling is necessary as the extracted sizzling gases would otherwise overheat the filter and vacuum system.

With the development of technology and the improvement of item quality in aerospace, energy, iron and steel processing, pharmaceutical and chemical industries, these industries need to obtain a certain vacuum environment. At the same time, the vacuum system used by these industries is usually continuously raising, and the vacuum level is continuously increasing. Moreover, the state’s environmental safety, 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 on the market, such as for example screw vacuum pumps and claw vacuum pumps, cannot meet up with the requirements of oil-free large pumping speed clean vacuum environment proposed by these industries due to the restrictions of pumping acceleration 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 satisfy the utilization in a clean vacuum environment with huge oil-free pumping speed.