During decarburization procedures the vacuum system needs to operate very long time in a rough pressure range. An efficient gas-cooling is essential as the extracted incredibly hot gases would otherwise overheat the filter and vacuum system.

With the development of technology and the improvement of product quality in aerospace, electric power, iron and steel digesting, pharmaceutical and chemical industries, these industries have to obtain a particular vacuum environment. At the same time, the vacuum system used by these industries is usually continuously increasing, and the vacuum degree is continuously increasing. Furthermore, the state’s environmental security, energy saving and three wastes discharge to the above-stated industries, etc. Certain requirements are more stringent. At the moment, the existing dry vacuum pumps in the marketplace, such as screw vacuum pumps and claw vacuum pumps, are unable to meet up with the requirements of oil-totally free large pumping swiftness clean vacuum environment proposed by these industries because of the restrictions of pumping velocity characteristics and structural mechanism.

Because of the shortcomings of the existing technology, the technical problem to be solved by the utility model is to supply an all-gas-cooled vacuum system to Gas-Cooling Roots Pump china satisfy the use in a clean vacuum environment with large oil-free pumping speed.