If the sealing degree drops, the fluid in Roots vacuum pump will leak, which greatly affects the use. What are the reasons for its appearance?

1. The isolated fluid pressure is less than the pressure of the sealed medium. In order to ensure the sealing function of the double faces of Roots vacuum pump, it is theoretically required that the pressure of the isolated fluid must be 0.1-0.15mpa higher than the pressure of the sealed medium to prevent the leakage of the medium containing certain toxicity.

2. Prone to evacuation. As the pump is in frequent startup and shutdown state, when the liquid level in the storage tank drops to a certain extent, it is easy to make the pump empty, resulting in severe vibration and noise. The occurrence of this phenomenon will inevitably lead to unstable working state of the seal and greatly increase the possibility of seal failure.

3. The conveying medium contains a large number of solid particles. The roots vacuum pump regularly transports various process fluids (including a large amount of cooling water) discharged from the process unit into the storage tank to the sewage treatment station for purification treatment, which contains a certain proportion of impurity solid particles, which are very easy to enter between the seals and cause severe abrasive wear, making the seals invalid at an early stage.

4. In the state of frequent startup and shutdown. When the liquid in the sewage storage tank is pumped, the pump will automatically stop running. When the liquid volume in the storage tank reaches the specified liquid level, the pump will automatically switch to the running state. It is precisely because the pump is in the frequent startup and shutdown state that the mechanical seal has a periodic unstable dry friction state, which is also one of the main reasons for frequent seal failure.

There are many reasons for seal failure of Roots vacuum pump, so comprehensive consideration should be taken when solving such problems.