Roots vacuum pump unit is a kind of equipment with good vacuum effect. Its use of oil should be reasonable in order to achieve the vacuum effect. Of course, in the process of use, sometimes the oil is trapped, which will annoy us. Next, let’s talk about why the equipment is trapped in oil.
1. To continuously supply oil to roots vacuum pump unit, the overlap coefficient e of gear meshing is required to be greater than 1, that is, when a pair of gears are not disengaged from meshing, the other pair of gears have entered meshing. In this way, there will be the moment when two pairs of gears mesh at the same time, forming a closed volume between the tooth direction meshing lines of the two pairs of gears, Part of the oil is trapped in this closed volume. When the gear rotates continuously, the closed volume will gradually decrease. When the two meshing points are at the symmetrical position on both sides of the node, the closed volume will be small. When the gear continues to rotate, the closed volume will gradually increase until the volume becomes large again.
2. When the closed volume is reduced, the trapped oil is squeezed and the pressure rises sharply, resulting in a sudden great impact load on the bearing and severe vibration of the pump. At this time, the high-pressure oil is squeezed out from all possible leakage gaps, resulting in power loss and heating of the oil.
3. When the sealing volume increases, there is no oil supplement, so a local vacuum is formed to separate the air originally dissolved in the oil and form bubbles. After bubbles are generated in the oil, a series of adverse consequences such as noise and cavitation will be caused. The above situation is the oil trapping phenomenon of Roots vacuum pump unit. This oil trapping phenomenon seriously affects the working stability and service life of the equipment.
Through the above analysis, the oil of Roots vacuum pump unit is trapped. We should not worry. We should first find the problem of eliminating the trapped oil, and then start to analyze the problem and find a solution. If we can’t solve it, we need to find technicians for maintenance. At the same time, we should pay attention to the connection between the oil suction place and the oil pressure place at any time.
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