The water quality and operating temperature of the circulating water exceeding a certain index are the main reasons for the fouling of the vacuum pump. Among water quality indicators, the hardness of water has the greatest impact. For this reason, it is necessary to reduce the hardness of the water as much as possible and control the working temperature of the circulating water to solve the problem of vacuum pump scaling.

1. Hardness of circulating cooling water
Analyzing the running process of circulating water in a vacuum pump is very similar to the running process of boiler water in a low-pressure hot water boiler. Therefore, the water quality of the vacuum pump is managed in accordance with the water quality standards of the hot water boiler, which can prevent the vacuum pump from scaling and corrosion.

The vacuum pump circulating water system is mostly an open circulating system, and the water return rate is relatively high. In the case that ion exchange equipment is not used for water treatment due to funds and other reasons, a softening pool and a high-level pool are generally used to supply water to the vacuum pump.

2. Temperature control of circulating cooling water
It can be seen from the above analysis that the difference between the temperature of the water ring in the vacuum pump and the water temperature of the softening pool is an important factor leading to fouling. Therefore, increasing the circulating water supply to improve the cooling effect is an important guarantee for minimizing the rate of fouling.

Therefore, during the operation of circulating cooling water, it is necessary to monitor the return water temperature and return water volume of each pump to ensure that the normal water supply volume and return water temperature of each pump does not exceed 40°C. The water supply can be controlled by a valve. If the temperature of the return water exceeds the regulation, it is necessary to supplement the low-temperature cold water or use other heat dissipation and cooling methods to reduce the temperature of the softened water in the softened pool.

3. Rinse the pump body regularly
The pump body drain gate valve of the water ring vacuum pump is not only used to normally discharge the water in the pump, but also can use the water pressure of the pump body to periodically flush the dirt and slag in the pump during operation. On the one hand, it can prevent the accumulation of dirt. On the other hand, it can also prevent water slag from turning into scale.

The fouling problem of vacuum pumps has its more complicated generation mechanism. Correct analysis of water quality indicators and operating parameters is the key to finding correct preventive measures. In addition to water temperature control and regular flushing of the pump body, water treatment is the most important link to prevent the pump body from scaling.