During decarburization processes the vacuum Gas-Cooling Roots Pump system must operate very long time in a rough pressure range. An efficient gas-cooling is necessary as the extracted scorching gases would or else overheat the filter and vacuum system.

With the development of technology and the improvement of product quality in aerospace, energy, iron and steel digesting, pharmaceutical and chemical industries, these industries need to obtain a particular vacuum environment. At the same time, the vacuum system utilized by these industries is certainly continuously raising, and the vacuum level is continuously increasing. Furthermore, the state’s environmental safety, energy conservation and three wastes discharge to the above-talked about industries, etc. The requirements are more stringent. At the moment, the prevailing 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 swiftness clean vacuum environment proposed by these industries due to the restrictions of pumping velocity 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 satisfy the use in a clean vacuum environment with huge oil-free pumping speed.