During decarburization processes the vacuum system needs to operate long time in a tough 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 have to obtain a specific vacuum environment. Simultaneously, the vacuum system used by these industries can be continuously raising, and the vacuum degree is continuously Gas-Cooling Roots Pump increasing. Furthermore, the state’s environmental security, energy conservation and three wastes discharge to the above-described industries, etc. The requirements are more stringent. At present, the prevailing dry vacuum pumps available, such as screw vacuum pumps and claw vacuum pumps, cannot meet the requirements of oil-totally free large pumping velocity clean vacuum environment proposed by these industries because of the restrictions of pumping swiftness characteristics and structural system.

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 utilization in a clean vacuum environment with huge oil-free pumping speed.