During decarburization processes the vacuum system must operate very long time in a rough pressure range. An efficient gas-cooling is essential as the extracted sizzling gases would 
or else overheat the filter and vacuum program.
With the development of technology and the improvement of item quality in aerospace, energy, 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 certainly continuously increasing, and the vacuum degree is continuously increasing. Furthermore, the state’s environmental protection, energy conservation and three wastes discharge to the above-pointed out industries, etc. Certain requirements are more stringent. At the moment, the prevailing dry vacuum pumps out there, such as for example screw vacuum pumps and claw vacuum pumps, cannot meet up with the requirements of oil-free large pumping quickness clean vacuum environment proposed by these industries due to the restrictions of pumping velocity characteristics and structural mechanism.
In view of the shortcomings of the prevailing technology, the specialized problem to be solved by the utility model is to provide an all-gas-cooled vacuum system to Gas-Cooling Roots Pump china satisfy the use in a clean vacuum environment with huge oil-free pumping speed.