During decarburization procedures the vacuum system needs to operate long time in a tough pressure range. A competent gas-cooling is necessary as the extracted popular gases would or else overheat the filter and vacuum program.
With the development of technology and the improvement of item quality in aerospace, electric power, iron and steel digesting, pharmaceutical and chemical industries, these industries need to obtain a particular vacuum environment. At the same time, the vacuum system used by these industries is certainly continuously raising, and the vacuum degree is continuously increasing. Furthermore, the state’s environmental security, energy saving and three wastes discharge to the above-mentioned industries, etc. Certain requirements are more stringent. At 
present, the prevailing dry vacuum pumps out there, such as screw vacuum pumps and claw vacuum pumps, are unable to meet the requirements of oil-totally free large pumping rate clean vacuum environment Gas-Cooling Roots Pump proposed by these industries because of the restrictions of pumping rate characteristics and structural system.
In view of the shortcomings of the prevailing technology, the specialized problem to be solved by the utility model is to supply an all-gas-cooled vacuum system to satisfy the utilization in a clean vacuum environment with large oil-free pumping speed.
