During decarburization processes the vacuum system must operate long time in a tough pressure range. A competent gas-cooling is essential as the extracted popular gases would otherwise 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 certain vacuum environment. At the same time, the vacuum system used by these industries can be continuously raising, and the vacuum degree is continuously increasing. Moreover, the state’s environmental protection, energy conservation and three Gas-Cooling Roots Pump china wastes discharge to the above-described industries, etc. Certain requirements are more stringent. At present, the prevailing dry vacuum pumps on the market, such as screw vacuum pumps and claw vacuum pumps, cannot meet the requirements of oil-totally free large pumping quickness clean vacuum environment proposed by these industries because of the restrictions of pumping quickness characteristics and structural system.
Because of 
the shortcomings of the prevailing technology, the specialized problem to be solved by the utility model is to provide an all-gas-cooled vacuum system to fulfill the use in a clean vacuum environment with huge oil-free pumping speed.
