During decarburization processes the vacuum Gas-Cooling Roots Pump china system needs to operate very long time in a rough pressure range. An efficient gas-cooling is necessary as the extracted popular gases would otherwise overheat the filter and vacuum system.
With the development of technology and the improvement of product quality in aerospace, energy, iron and steel processing, 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 security, energy conservation and three wastes discharge to the above-stated industries, etc. The requirements are more stringent. At the moment, the prevailing dry vacuum pumps available, such as for example screw vacuum pumps and claw vacuum pumps, cannot meet up with the requirements of oil-free large pumping 
acceleration clean vacuum environment proposed by these industries due to the restrictions of pumping speed 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.
