Since the balanced wear-resisting multistage pump common failures and solutions

One, fault phenomenon: the balanced multistage pump not bibulous, violent vibration, pressure gauge, vacuum gauge pointer or vacuum gauge is a high degree of vacuum. Cause analysis: 1, pump water filling is not enough; 2, suction pipe or table leak; 3, bottom valve does not open; 4, and blockage of the suction pipe; 5, suction height is too large; 1, water injection gas elimination method; 2, to tighten the screw; 3, repair or replace the bottom valve; 4, cleaning suction pipe; 5, to reduce the suction height.

2, fault phenomenon: self balancing wear-resisting multistage pump pressure gauge, but not out of the water or flow is too small. Cause analysis: 1, the port congestion, or bottom valve partially blocked; 2, the pump speed is lower than the specified value; 3, system total head higher than the pump design head; 4, pump into the gas; 5, pump steering is wrong; Six, wear parts, internal leakage is too large; Method 1, cleaning port or remove bottom valve foreign body; 2, increasing the pump rotation speed increase pump series or reducing line loss; 3, blocked parts inlet; 4, electrical wiring; 5, the replacement of wear parts.

3, fault phenomenon: the balanced wear-resisting multistage pump motor current is too large. Cause analysis: 1, the system total head is much lower than the design of the water pump head; 2, pipeline rupture running water; 3, not closed when starting export gate valve; 4, water pump shaft and motor shaft is different; 5, rotating and fixed friction; Six, bearing wear; 7, rotor imbalance, produce vibration; 8, the voltage is too low; Adjusted elimination method 1, close the valve, or reduce pump series; 2, stop the pump, processing line; 3, close the gate, restart; 4, to find, to avoid system works for pump; 5, tear open pump to adjust; 6, replace bearing; 7, remove the rotor do static balance and dynamic balance testing; 8, increase the voltage.

4, failure phenomenon: gland leakage, packing hot smoke, packing is shorter. Cause analysis: 1, the pump shaft and motor shaft is different; 2, shaft bent; 3, filler sleeve damage, or improper packing installation, or packing type is wrong; 4, have impurities between packing and shaft sleeve; Method 1, to find, 2, remove, correct shaft; 3, grinding or replace collar, or reinstall packing, uniform compression, or replacement of packing; 4, replace the packing.

5, fault phenomenon: the balanced wear-resisting multistage pump vibration or noise. Cause analysis: 1, the pump cavitation occurred; 2, port congestion, or bottom valve partially blocked; 3, pipeline rupture running water; 4, outlet valve to open the start; 5 different heart, pump and motor shaft, or shaft bending; 6, inadequate rigidity; 7, rotating and fixed friction; 8, impeller defect; 9, bearing grease too little or too much; 10, bearing wear or with dirt; Method: 1, to reduce the geometric installation height of pump, reduce the suction resistance; 2, clear passage or clean up the bottom valve; 3, stop the pump processing line; 4, close the gate, restart; 5, to find, or maintenance, changing shaft; 6, reinforce the foundation; 7, disassembly, readjust the pump; 8, replacing the impeller; 9, add grease in moderation; 10, replacing or cleaning bearing, and pay attention to the sealed bearing.

6, fault phenomenon: bearing heating. Cause analysis: 1, the pump shaft and motor shaft is different heart, or shaft bending; 2, rotating and fixed friction; 3, bearing damage, or bearing with dirt or water; 4, bearing grease too much or how much; Method: 1, to find, or maintenance, changing shaft; 2, remove, readjust the pump; 3, add grease in moderation; 4, replace or clean the bearing, and pay attention to the sealed bearing.

7, fault phenomenon: the place such as the middle joint leakage. Cause analysis: 1, the poles bolt fastening force is not enough or uneven force; 2, the manufacturing precision of parts ( Roughness, beating or vertical degree) Do not meet the design requirements, or residual stress deformation of parts; 3, combining with the surface impurity or damage; Excluded methods: 1st, to tighten the poles. 2, open pump inspection; 3, overhaul joint surface.

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