Coal mine with wear-resisting MD type centrifugal pump parts fault analysis and processing

Coal mine with wear-resisting MD type centrifugal water pump in mine, petroleum, chemical and other industries widely used, plays a very important role, wear-resisting centrifugal pump parts failure could cause major mechanical and electrical accidents.

coal mine with wear-resisting MD type centrifugal pump structure and principle of

coal mine with wear-resisting MD type centrifugal pump pump body is mainly composed of suction, middle, spit out paragraphs, balancing device, sealing device cooling device and other parts. When the motor drives the pump high-speed rotating impeller fluid medium high speed to jilt to the sides of the blade, and through the guide vane pass high-speed fluid to the lower impeller, after progressive can obtain higher head, total and satisfy the requirement of drainage.

coal mine with wear-resisting MD type centrifugal pump parts fault analysis and processing and

impeller mouth ring:

most of the water pump impeller blade for cavitation or one solid absorption, metal impurities such as damaged. Mouth ring ( Also known as seal ring) Wear usually because of improper installation amount of wear in the process might also contribute to the impeller back cap loose mouth ring wear. If mouth ring badly worn, it should be replaced the impeller; If mouth ring wear lighter, it can be repaired.

balance device:

balance disc and balance ring wear too much, Generally more than 2 mm) Or convex concave is not usual to repair welding and grinding groove on the pump casing and the gimbal ring and the pump shell surface add 1 piece of 3 mm thick together tetrafluoroethylene gasket. So after removing the repair welding manual grinding flat plate caused by uneven, gasket materials and soft hard moderate. Wear new balance ring should be changed too much and balance disc mechanical seal:

mechanical seal has a pair of perpendicular to the axis of the rotating end face of the face in the fluid pressure and compensation under the action of mechanical stretch rely on auxiliary seal cooperate with the other end of the stick with relative sliding to prevent fluid leakage. The proportion of mechanical seal leakage accounted for more than 50% of the total maintenance pump leakage, the operation of the mechanical seal is good or not directly affects the normal operation of the pump. Mechanical seal leakage will cause a large pump rotor axial channeling the momentum of the auxiliary seal and shaft are to increase, ring cannot be flexible on the shaft to move. Turn on the water pump, without compensation displacement after dynamic and static ring wear. In the assembly of mechanical sealed Zhou, axial momentum window should be less than zero. 1 mm, auxiliary seal and shaft interference quantity should be moderate in the guarantee of radial seal at the same time also can ensure the ring is assembled on the shaft flexible mobile ( Press ring to spring free to bounce back) 。

pump shaft:

rotor pump shaft is mounted on the core parts of the impeller, shaft sleeve, the high speed rotating in the pump body. shaft bending bearing seat and axiality deviation will cause the impeller of pump shaft, impeller, pump shell, seal ring and shaft sleeve of wear, make the water pump body vibration increase, also increase the axial thrust, balance disc friction and balance. As long as the pump shaft does not produce cracks and serious surface wear or curvature can be used to repair. Shaft bending amount must not exceed 0. 6 mm, greater than this value should be alignment, it is better to screw press is not heating straightening.

bearing temperature:

bearing temperature rise caused by excessive and eventually destroyed bearing factors are: (1) the balancing drum axial force effect is bad, too much residual axial force bearing load is too large. (2) the lubricating oil is unqualified, insufficient oil or oil cavity contains impurities such as iron into the bearing. (3) pump bearing Angle error ambassador bearing load increase. (4) bearing clearance or inadequate bearing caused mismatch on inner and outer ring cross positioning inside and outside the increased load.

rotor axial momentum,

after the pump assembly to the rotor of the whole quantity is measured. First not installed balance disc, installation in one shaft sleeve is installed in place of balance disc and lock nut and its rotor lock together at all levels of a rigid rotor to the first suction direction makes the sealing ring near the impeller and the pump body, shoulder to the pump body is measured with depth ruler a plane at a distance of a. Then pull the rotor to the discharge side, make the back cover near the guide vane impeller measuring distance to b, at this time a minus B is the amount of the total pump. Measure the total amount of channeling will be presented with the pump specifications of quantity after comparing if measured value is greater than the given value of 1 mm, it should be replaced the wear of impeller. If allow large axial channeling momentum in the balance disc and balance between ring and a smooth surface, uniform thickness adjustment pad.

coupling gap:

at the coal mine with wear-resisting centrifugal pump with the balance disc wear in the process of running the suction side of the rotor will continue to move, so the maintenance should make appropriate adjustments for the coupling gap. Considering the influence of pump shaft heat expansion, according to the regulations of maintenance related standard coupling of gap should be 2 - larger than the specified value 3mm.

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