Water ring vacuum pump shaft bending, the cause of the crack and fracture -

in monoculture water ring vacuum water pump parts damage, the shaft damage accounted for a significant proportion. shaft damage including bending, cracking and breakage.

water ring vacuum pump shaft bending is mainly caused by insufficient sleeve stiffness and impeller unbalanced, this led to the deformation in the process of operation. Shaft bending direction and size measurement through the following ways: °

flat on the shaft bracket, the two bearing point ( Can be the location of the pump shaft center hole or shaft neck) Adjust to the same height, choose several isometric parts on axis, in a rotating shaft with dial gauge measuring radial runout of the four direction ( Once per 90 degrees) And recorded. Based on these data, be able to get four directions of bending value, with graphic method can work out the direction and size of maximum bending, which can be straightened.

water ring vacuum pump shaft cracks and fractures are often appear in the local stress concentration, such as the keyway edges and diameter of mutation. Is the usual cause of damage to the vibration caused by fatigue damage.

if the pump shaft fatigue crack ( The fracture of precursor) And should be replaced in a timely manner. If due to objective factors need to continue to use, temporarily unable to change, temporary remedy is to repair weld crack. Should be paid attention to when using the pump shaft after repair welding, the change of the repair welding area, so as to avoid an accident.

when using monoculture water ring vacuum pumps, often appear fault is the pump shaft fracture ( Especially for larger quantity of air pump) 。 Fracture generally perpendicular to the axis, very neat, like a knife, the whole cross section smooth, most have a metallic luster, a small number of coarse. Obviously, the destruction caused by fatigue fracture characteristics.

is the main reason of the fatigue damage during the running of pump shaft of pump cavity gas force on the pump shaft, also known as the radial force.

in addition to the water ring vacuum pump is the root cause of the radial force, unreasonable structure is the important reason for the water pump shaft fatigue damage can not be ignored. Mainly:

the water ring vacuum pump shaft and impeller clearance fit for level, keyway unused 0 type sealing ring seal. the liquid ( Especially in the chemical industry used in corrosive liquid liquid ring) Through fitting clearance and slotting shaft into the shaft hole corrosion and the impeller shaft hole, which greatly reduce the fatigue strength. After the corrosion and wear, fit clearance increase ( Some are grinding into oval shaft hole) , this not only affect performance, and aggravate vibration and promote the fatigue fracture.

general water ring vacuum pump shaft without overheating processing, low fatigue strength. In order to prevent fracture, pump shaft must be at least, quenching and tempering and nitriding under conditions allow.

the design, it is necessary to avoid sudden changes in cross section is too big. Should not be used during the transition in sharp corners, but should use rounded corners connection. Surface finish should not be low, especially in the shaft is easy to fracture. The circumference of the machining process, the different diameter of axle transition process shall ensure that quality, and strictly carried out in accordance with the drawings required size and finish. shaft and the transition to perform surface must not have tool marks, scratches, bumps and other defects.

the pump shaft fatigue damage does great harm to production, is one of the focuses of the user. Vacuum water pump manufacturer solution is: according to the size of the radial force check the pump shaft fatigue strength. When using the corrosive gas and liquid ring, the corresponding corrosion resistant material should be used. shaft must after quenching and tempering, the process of must ensure the quality, etc.

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