During decarburization processes the Gas-Cooling Roots Pump vacuum system needs to operate very long time in a tough pressure range. An efficient gas-cooling is necessary as the extracted incredibly hot gases would otherwise overheat the filter and vacuum system.

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 have to obtain a specific vacuum environment. Simultaneously, the vacuum system utilized by these industries can be continuously raising, and the vacuum level is continuously increasing. Moreover, the state’s environmental security, energy conservation and three wastes discharge to the above-mentioned industries, etc. Certain requirements are more stringent. At the moment, the prevailing dry vacuum pumps on the market, such as for example screw vacuum pumps and claw vacuum pumps, are unable to meet the requirements of oil-free large pumping swiftness clean vacuum environment proposed by these industries due to the restrictions of pumping quickness 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 fulfill the utilization in a clean vacuum environment with large oil-free pumping speed.