Causes Of Damage And Repair Of Water Ring Vacuum Pump Shaft

In the damage of the parts of the water ring vacuum pump, the damage of the shaft occupies a large proportion. Damage to pump shaft includes bending, crack and fracture.

The reason of the pump shaft bending is mostly due to the lack of stiffness of the sleeve, coupled with the large imbalance of the impeller, resulting in deformation during operation. The bending direction and size of the axis can be measured by the following methods:

Flat on the shaft bearing and two supporting points (can be a pump shaft center hole, it can also be a shaft neck) to contour, choose several isometric profile on shaft, the shaft rotating a circle with dial gauge measuring lift respectively four directions (i.e., turn 90 ° measuring once a week) on the radial runout, a record. According to this data, the bending values in four directions can be obtained, and the maximum bending direction and size can be found by the graphical method, so that the straightening can be carried out.causes-of-damage-and-repair-of-water-ring-vacuum-pump-shaft

The fracture and fracture parts of the pump shaft often occur in places where local stress is concentrated, such as the edge of the keyway and the abrupt change of diameter. The cause of damage is often fatigue damage due to vibration.

If the pump shaft appears fatigue crack (soon to break the warning), it should be replaced in time. The temporary remedy is to reweld the crack if it needs to be continued due to the temporary impossibility of replacement due to objective factors. When using the pump shaft after rewelding, always pay attention to the change of the rewelding zone to avoid accidents.

In the use of the single-purpose water ring vacuum pump, the common failure is the breaking of the pump shaft (especially the pump with large air volume). Generally, the fracture surface is perpendicular to the axis line, which is very neat like a knife cutting. The whole section is mostly smooth and metallic luster, while a small part is rough. Obviously, this is the fracture characteristics caused by fatigue failure.
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The main reason for the fatigue failure is that the pressure of gas in the pump chamber on the pump shaft is caused during the running of the pump shaft, which is also called radial force.