After the multi-stage multi-stage pump overhaul the reason for the total blown fuse

This situation occurs mostly because of the multi-stage pump in the overhaul generated when balancing plate adjustment and process errors caused. Because of the friction between the rotating part and the stationary part, the motor is overloaded and the fuse blows. For example, in the wrong adjustment, the entire rotor position is wrong, that is, the balance disc did not wait on the balance ring, the impeller has been in contact with the pump housing. At this moment, the rotation will inevitably cause the friction between impeller and pump casing. And because then balance plate does not work, can not produce a balance force, the entire axial thrust are on the impeller, causing serious wear and tear with the pump shell, the motor overload blow fuse. In the maintenance process error, although the rotor position is correct, but due to the balance plate there is too large scoop (or balance ring scoop), and make it out of balance. Because the scoop is too large, the pressure can not be balanced in front of the balance disc to generate the backward balance force; thus, the larger axial thrust (a few tons to tens of tons) generated by the impeller pulls the entire rotor toward the water inlet Side of the channeling, causing the balance plate and balance ring scoop partial maximum phase friction, the motor overload fuse blown. The first error is less common, the second error is more. For example, there was a water pump in the past. After overhauling, the load was started and the fuse was blown. Disassembled after examination and found that a large amount of balance plate scoop, mouth up to 0.60 mm, the contact friction blue. Later to eliminate the mouth to 0.15 mm, the current is normal after starting. There are also not caused by the above two reasons. In the case of a segmented multistage pump, a ø3 / 4 inch valve from the balance disc to the balance pipe in the pump inlet section, although the door was in the open position, was in fact a flap flap that blocked the balance tube Of the channel, causing the balance pipe pressure rise, balance disc wear, motor overload fuse blown. In fact, there are many reasons for overloading, but the most serious is the overloading caused by unbalanced mechanism. In the case of a blown fuse, it is almost always caused by a malfunction of the balance mechanism.

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