Motor, pump and pump vibration causes and eliminating measures
Motor, pump and pump vibration causes and eliminating measures. In rotating equipment and mobile media, low-intensity mechanical vibration is inevitable. Therefore, in units of the manufacture and installation process, in units of the design, operation and management should be avoided as much as possible vibration caused by interference, to reduce the harm to the minimum vibration. When the pump or the unit vibration, should according to the specific situation, analyses may be the reason for vibration, find out the crux of the problem, take effective measures to eliminate the technology. Some measures are relatively simple, some measures were quite complex. If you need a large amount of money, some programs available to deal with the technical and economic comparison, the combined unit technology. The following gives a motor, pump and pump vibration causes and eliminating measures.
One, the pump motor vibration reasons and eliminating measures
1) rotor friction: air-gap or uneven bearing wear.
The elimination of measures: to adjust the gap, adjust or replace the bearings.
2) the rotor can be stopped at any position or power imbalance.
Elimination: re-school rotor static balance and dynamic balance.
3) bearing grinding: unit not concentric or bearing wear.
Elimination: re-school unit concentricity, adjust or replace the bearings.
4): axial loosening screws loose or defective mounting.
Elimination : tightening screws, check installation quality.
5) based on Vibration: foundation stiffness or bad angle of screw loosening.
Elimination: reinforcing the basis or tighten bottom screws.
6) three-phase current instability: reduced torque, rotor cage end ring or malfunction.
Elimination: Inspection and repair or rotor cage end ring.
In two, the water pump vibration causes and eliminating measures
1) pump shaft swing through the large: bearing and shaft neck wear or clearance is too large.
Elimination measures of shaft neck: repair, adjust or replace the bearings.
2) manual jigger difficulties: the curved shaft, bearing wear, unit is not concentric, impeller pump bumping shell.
Eliminating measures: straightening shaft, adjust or replace the bearings, re-school unit concentricity, reset gap.
3) hydraulic imbalance: unbalanced centrifugal pump impeller, individual leaf slot is blocked or damaged.
Elimination: re-school impeller static balance and dynamic balance, clogging, repair or replacement of the impeller.
4) axial flow pump shaft power is too large: the pool water level is too low, the impeller submerged depth, debris around the impeller, pump cavitation damage in varying degrees, impeller defect.
Eliminating measures: raising the pool water level, reduce pump installation elevation eliminate sundries, and set the column effluent gate, repair or replacement of the impeller.
5) based on Vibration: foundation stiffness or bad angle screw loosening or resonance.
Elimination: reinforcing the basis, tighten the anchor screw.
6) a dramatic decline in the efficiency of centrifugal pump or axial flow pump unit efficiency slightly decreased, accompanied by cavitation noise.
Eliminating measures : changing the pump speed, to avoid the resonance area, identify the occurrence of cavitation causes, take measures to eliminate cavitation.
Three, other causes of pump unit and measures to eliminate vibration
1) trashrack plugged, the pool water level lowering.
Elimination: the column effluent grid dirt cleaning, add column sewage grid dirt cleaning device.
2) the formation of long siphon, for a longer period of time in the off-design operation.
Elimination: with vacuum devices, rational design and improvement of siphon type outlet passage.
3) in the outlet conduit of rapid pressure change and effect of water hammer.
Eliminating measures: relief valve and surge tank closure and other measures to prevent water hammer.
4) inlet pipe fixation or cause resonance.
Eliminating measures: strengthening pipe support, an additional pipeline and buttress the town pier, changing the operating parameters, change operating parameters to avoid the resonance zone.
5) door repeatedly impact portal or close the impact force is too large.
Elimination: channel (or channels) export is provided in front of the vent, the rational design of door control measures, reduce the impact force when the door is closed.
6) before the pool and into the pool design unreasonable, and the pump inlet passage is set so that the deterioration of water conditions.
Elimination: the column effluent grid dirt cleaning, add column sewage grid dirt cleaning device for rational design and into the pool, into the pool and inlet passage design.
7) startup and shutdown sequence is not reasonable, resulting in deterioration of water pump inlet condition.
Eliminating measures: optimize the boot and shutdown sequence.