During decarburization processes the vacuum system must operate very long time in a tough pressure range. A competent gas-cooling is essential as the extracted incredibly hot 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 processing, pharmaceutical and chemical industries, these industries need to obtain a certain vacuum environment. At the same time, the vacuum system utilized by these industries is usually continuously raising, and the vacuum degree is continuously increasing. Furthermore, the state’s Gas-Cooling Roots Pump china environmental security, energy conservation and three wastes discharge to the above-stated industries, etc. Certain requirements are more stringent. At the moment, the prevailing dry vacuum pumps in the marketplace, such as screw vacuum pumps and claw vacuum pumps, are unable to meet the requirements of oil-free large pumping rate clean vacuum environment proposed by these industries because of the restrictions of pumping swiftness characteristics and structural mechanism.
In view 
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 large oil-free pumping speed.