1. Hardness of circulating cooling water

The operation process of circulating water in vacuum pump is very similar to that of boiler water in low-pressure hot water boiler. Therefore, managing the water quality of vacuum pump according to the water quality detection standard of hot water boiler can not only avoid the scaling of vacuum pump, but also avoid the corrosion of vacuum pump.

Most of the vacuum pump circulating water systems are open circulating systems, and the return water rate is relatively high. When special equipment for ion exchange is not selected for water treatment due to capital and other factors, a softening tank and a high-level tank are usually used to supply water to the vacuum pump.

2. Temperature control of circulating cooling water

From the above introduction, it can be seen that the difference between the water ring temperature in the vacuum pump and the softening water tank temperature is the main factor causing scaling. Therefore, increasing the circulating water supply and improving the cooling effect is the main guarantee to minimize the scaling rate.

Therefore, in the operation process of circulating cooling water, it is also necessary to monitor the return water temperature and return water volume of each pump to ensure that the normal water supply and return water temperature of each pump do not exceed 40 ℃. The water supply can be controlled by valves. If the return water temperature exceeds the regulations, supplement low-temperature cold water or use other cooling methods to reduce the temperature of softened water in the softened water tank.

3 wash the pump body regularly

The pump body drainage gate valve of the water ring vacuum pump can not only discharge the accumulated water in the pump normally, but also flush the dirt and water slag in the pump regularly by using the water pressure of the pump body in the operation process, which can not only avoid the accumulation of dirt, but also avoid the conversion of water slag into scale.

The scaling problem of vacuum pump has its relatively complex formation mechanism. The correct introduction of water quality indexes and operation parameters is the key to find out the correct preventive measures. Apart from temperature control and regular flushing of the pump body, water treatment is the most important link to avoid scaling of the pump body.