How to add lubricating oil without stopping roots vacuum pump?

The greatest advantage of Roots vacuum pump is that it has high pumping rate under low inlet pressure and can reach a relatively high vacuum pump limit. Therefore, roots vacuum pump has stable operation performance, long service life and low maintenance cost. However, it was also found that roots vacuum pump must stop adding lubricating oil in production activities every time, which affected production. So how can we improve this problem? Today, Xiaobian teaches you a skill. My friends remember it!

It can be seen from the structure of Roots vacuum pump that the pump chamber of synchronous guide gearbox and roots pump is sealed by internal oil seal. After the roots vacuum pump runs, a certain degree of vacuum is formed in the pump chamber. There will be a pressure difference between the gearbox and the pump chamber. Under the action of differential pressure, the lubricating oil will follow the pump chamber of the oil seal. Only when the pressure in the gearbox and pump chamber is balanced will the lubricating oil stop entering.

Since the roots vacuum pump operates for a long time, the lubricating oil in the gearbox will be gradually sucked into the pump chamber, indicating that the oil level is lower than the standard oil level. At this time, the machine must be stopped and lubricating oil must be injected from the lubricating oil addition hole. Otherwise, the lubricating oil in the gearbox will be quickly sucked into the pump chamber due to the pressure difference between the atmosphere and the pump chamber.

In view of this situation, consider balancing the pressure difference by connecting the gearbox and the roots vacuum pump inlet, so as to maintain the same vacuum between the pump chamber and the gearbox. Install a special large oil cup at the lubricating oil adding hole. The oil cup is made of polytetrafluoroethylene. In order to avoid the problem of vacuum reduction caused by oil cup hole leakage, an isolation ball valve is installed at the lower part of the oil cup. When the roots pump is running, the ball valve on the lower side of the oil cup opens. Once the liquid level of roots pump drops, it is necessary to add lubricating oil, close the ball valve and open the threaded sealing cover on the top of the oil cup for filling.

After the above operations, there is no need to shut down when adding lubricating oil to roots vacuum pump, which can not only ensure the operation of the equipment, but also solve the problem that shutdown affects production. Please find professional vacuum pump personnel for equipment maintenance.