During decarburization procedures the vacuum system must operate long time in a tough pressure range. An efficient 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 product quality in aerospace, electric power, iron and steel processing, pharmaceutical and chemical industries, these industries need to obtain a specific vacuum environment. At the same time, the vacuum system utilized by these industries is definitely continuously increasing, and the vacuum level is continuously increasing. Moreover, the state’s environmental Gas-Cooling Roots Pump protection, energy conservation and three wastes discharge to the above-described industries, etc. Certain requirements are more stringent. At present, the existing dry vacuum pumps out there, such as for example screw vacuum pumps and claw vacuum pumps, are unable to meet up with the requirements of oil-totally free large pumping quickness clean vacuum environment proposed by these industries because of the restrictions of pumping velocity 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 huge oil-free pumping speed.