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

With the development of Gas-Cooling Roots Pump technology and the improvement of product quality in aerospace, energy, iron and steel processing, pharmaceutical and chemical industries, these industries need to obtain a certain vacuum environment. Simultaneously, the vacuum system used by these industries is continuously increasing, and the vacuum level is continuously increasing. Moreover, the state’s environmental protection, energy saving and three wastes discharge to the above-talked about industries, etc. The requirements are more stringent. At the moment, the existing dry vacuum pumps in the marketplace, such as for example 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 due to the restrictions of pumping velocity 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 fulfill the utilization in a clean vacuum environment with huge oil-free pumping speed.