MD155 - 30 * 10 mining wear-resisting multistage centrifugal pump with spare parts failure analysis

MD type mining wear-resisting multistage centrifugal pump in mine, petroleum, chemical and other industries are widely used and plays a very important role, a slight fault is likely to cause a major mechanical and electrical accidents. In this paper, the coal mine central pump house MD type mine multistage pump as the object, analyzed the water pump in installation and operation of failure and the treatment measures. The pump by the changsha pump industry co. , LTD. , production, model for MD155 - 30 * 10, displacement of 155 m3 / h, head of 300 meters.

impeller and the mouth rings:

mining wear-resisting of multistage centrifugal pump impeller blade mostly because cavitation or inhalation of solid content and metal impurity damage. Mouth ring ( Also called general because the installation process of sealing ring wear improper wear quantity may also be caused by loose impeller back cap mouth ring wear. If mouth ring badly worn, it should be replaced if impeller mouth ring wear lighter, repair can be performed.

balance device:

balance disc and balance ring wear too much, With more than 2 mm) Methods or not, at ordinary times to repair welding and grinding groove on the pump casing and the gimbal ring and the pump shell surface add 1 piece of ptfe gasket 3 mm thick. So after removing the repair welding manual grinding flat plate caused by uneven, gasket materials and soft hard moderate. Wear too much new balance ring and balance disc should be changed.

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, thus preventing 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 the pump rotor axial momentum large, secondary seal and shaft interference to increase ring cannot be flexible on the shaft to move. After the pump double rotating and static rings wear without compensation displacement. In the assembly of mechanical seal, shaft axial momentum 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:

MD type mining wear-resisting multistage centrifugal pump rotor pump shaft is mounted on the core parts of the impeller, shaft sleeve high-speed rotation in the water pump body. shaft bending, bearing and axiality deviation will cause the impeller of pump shaft, impeller, pump shell, seal ring and shaft sleeve wear make pump body vibration increase axial thrust also increases, the balance disc and balance friction. 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 of the bearing load excessive residual axial force caused by bad too. (2) the lubricating oil is unqualified oil shortage or contains impurities such as iron into the bearing oil cavity. (3) pump bearing Angle error is too large, makes the bearing load. (4) bearing clearance or inadequate bearing inner and outer ring cross positioning, causing dislocation inside and outside the circle, make the load increases.

rotor axial momentum,

after the pump assembly to the rotor of the whole quantity is measured. First not to install the balance disc is mounted on the 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:

in MD type mining wear-resisting multistage centrifugal pump operation process, along with the balance disc wear 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 between 2 - should be bigger than the specified value 3mm。

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