Roots vacuum pump in continuous operation, there is no abnormal phenomenon, once stopped in a short period of time, it is difficult to start again, or even can not start. What is the reason for this phenomenon?

The scale on the inner wall and outer surface of Roots vacuum pump is too thick, and the gap is blocked. In the installation or replacement of the intake pipe, the pipe was not cleaned, resulting in welding slag or other hard debris into the pump. When the rotor is in series, the friction between the rotor end and the end cover increases the resistance. The rotor shaft is bent and the rotor or synchronous gear is locked.

In view of the above reasons, the corresponding solutions are as follows:

There are two ways to solve the scale. One is mechanical method, which is to remove the scale with a shovel or scraper; the other is to use chemical method, with hydrochloric acid concentration of 5% - 10%.

After the chemical method is used to remove the scale, steam and water must be used to wash the equipment to avoid corrosion. In order to avoid serious scaling, the cooling water should be clean cold water with the temperature below 20 ℃. Before installing the pipe, the inner wall of the pipe must be cleaned. If possible, the inner wall of the pipe should be cleaned first, and then the pipe should be blown with compressed air. Take out the rotor and reassemble it. Find out the cause and deal with it according to the specific situation. Take out the rotor from roots vacuum pump shell and place it on two parallel and equal height knife edges or similar supports. Check whether the rotor shaft has bending and the size and direction of bending degree with dial indicator. If the bending degree is small, straighten it with a press. If the bending degree is large, it needs to be replaced. Roots vacuum pump in the use of attention to the above four points, to avoid damage to the pump, but also regular maintenance, timely removal of scale, foreign matter, etc., to ensure the normal operation of the pump.