During decarburization procedures 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 otherwise 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 specific vacuum environment. At the same time, the vacuum system used by these industries is certainly continuously increasing, and the vacuum level is continuously increasing. Furthermore, the state’s environmental security, energy conservation and three wastes discharge to the above-pointed out industries, etc. Certain requirements are more stringent. At present, the Gas-Cooling Roots Pump china existing dry vacuum pumps available, such as 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 acceleration 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 provide an all-gas-cooled vacuum system to satisfy the use in a clean vacuum environment with large oil-free pumping speed.
