After the vacuum pump is equipped with an ejector, the system vacuum is maintained, but the gas passing through the vacuum pump is the system intake and driving gas (atmosphere introduced from the separator). After the mixed gas enters the vacuum pump, the operating vacuum of the vacuum pump is reduced, thereby eliminating cavitation. , Vibration and noise. Through the on-site noise test, the noise was reduced from 97db before the renovation to 84db after the renovation, which met the requirements.

On the other hand, the vacuum pump runs before the ejector is installed and the vacuum of the system is close to 5kPa, which is higher than the vacuum in the pump after the ejector is about 13kPa. The shaft power of the vacuum pump at 13kPa is higher than that at 5kPa, which causes the current to increase. !

It can be seen from the above table that the vacuum of the unit is slightly increased after the renovation, which is increased by about 0.5KPa, but it can be ignored considering the leakage and repair of the vacuum system after the unit is overhauled. The current increased from 197A to 224A, an increase of about 13%, and the factory power consumption increased slightly. However, the reduction of cavitation has increased the overall life of the vacuum unit, and greatly reduced the replacement of spare parts (replacement of a rotor impeller requires more than 100,000 yuan). In addition, noise and vibration problems have been solved, especially the noise has been eliminated significantly, and the noise has been controlled. Qualified range. The vibration damage of thermal instruments is also reduced, and the reliability of the equipment is guaranteed.

After adding the atmospheric ejector, there is no obvious improvement effect on the vacuum of the vacuum unit, but the operating current is increased; the cavitation and noise problems of the vacuum pump are solved after the transformation, the life of the vacuum pump is improved, the vibration is reduced, the damage of the thermal instrument is reduced, and the maintenance manpower is reduced. Reduced, spare parts are reduced, and reliability is greatly improved.