During decarburization processes the vacuum system needs to operate very long time in a rough pressure range. An efficient gas-cooling is necessary as the extracted sizzling gases would or else overheat the filter and vacuum program.

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 need to obtain a particular vacuum environment. Simultaneously, the vacuum system used by these industries is certainly continuously increasing, and the vacuum degree is continuously increasing. Moreover, the state’s environmental protection, energy conservation 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 screw vacuum pumps and claw vacuum pumps, are unable to meet the requirements of oil-free large pumping acceleration clean vacuum environment proposed by these industries because of the restrictions of pumping swiftness characteristics and structural mechanism.

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