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 hot gases would otherwise overheat the filter and vacuum program.

With the development of Gas-Cooling Roots Pump technology and the improvement of item quality in aerospace, energy, iron and steel processing, pharmaceutical and chemical industries, these industries have to obtain a particular vacuum environment. Simultaneously, the vacuum system used by these industries is definitely continuously increasing, and the vacuum degree is continuously increasing. Moreover, the state’s environmental safety, energy saving and three wastes discharge to the above-talked about industries, etc. Certain requirements are more stringent. At the moment, the prevailing dry vacuum pumps available, such as for example screw vacuum pumps and claw vacuum pumps, are unable to meet the requirements of oil-totally free large pumping swiftness clean vacuum environment proposed by these industries because of the restrictions of pumping rate characteristics and structural mechanism.

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