Pump failure and access.

Pumps play an important role in water supply systems as water delivery and boosters.
In view of the current situation of water supply and drainage system, this paper mainly analyzes the common operation failure and causes of centrifugal pump in the process of use, and puts forward the general method of fault treatment, which will have a certain guiding and reference effect on the safety, reliability and equipment efficiency of the operation of the lift pump equipment and ensure the effective use of water supply equipment.
In order to ensure that the unit is in good technical condition, to better provide services for people's living water, all mechanical and electrical equipment in the pumping station must be normal inspection, maintenance and repair, update those fragile parts that are difficult to repair, repair those parts that can be repaired.
maintenance and repair can find problems in a timely manner, eliminate hidden dangers, prevent accidents, ensure the reliability and stability of the operation of the unit, improve the equipment's good rate and utilization rate, extend its service life.
maintenance and maintenance of the unit, we can also find the design and manufacturing problems, accumulate experience, for the pump station design, improve the level of pump station management, pump station renewal and transformation to provide a basis.
common failures of water pumps are divided into mechanical failure and hydraulic failure.
failures in the course of use and their possible causes are as follows: (1) the water pump does not produce water.
the main causes of this failure are: the pump is not filled with liquid, the water absorption height is too high, the suction pipe has air or leakage, the temperature of the delivered liquid is too high, the suction valve is blocked, steering error.
(2) pump vibrates.
The main causes of this failure are: the center of the water pump and the primary motive is not within the standard range, the angle screws of the pump body are loose, or the foundation is not secure, the bearing cover is not tight enough to make the shaft tile beat in the body, the rotor mass is unbalanced, the inherent frequency of the rotor is proportional to the vibration frequency, and the small flow and flow instability, or the intermediate recirculation door is damaged.
(3) traffic is insufficient.
The main causes of this failure are: the suction valve or impulsion is blocked, the inhalation height is too large, the entry tube elbow is too much, the resistance is too large, the pump body or suction tube leak, the filler is leaking air, the seal ring is too worn, implore corrosion, wear.
(4) output pressure is insufficient: the main causes of this failure are: gas in the medium;
(5) consumption power is too large: the main causes of this failure are: filler pressure cover is too tight, filler letter heat, coupling skin ring is too tight, rotating part of the shaft curtain is too large, center line offset, parts stuck.
(6) bearings overheat.
main causes of this failure are: centerline offset, lack of oil or oil is not clean, oil ring rotation is inflexible, bearing damage.
(7) leak in the seal is too large.
The main causes of this failure are: the material of the filler or sealing element is not selected correctly, the shaft or shaft sleeve is worn, the shaft is curved, the center line is shifted, the rotor is unbalanced, the vibration is too large, the motion, the static ring is corroded and deformed, the seal surface is scratched, the spring is invalid or under pressure, the cooling water is insufficient or blocked.
clear performance - analysis of the reasons - to eliminate.
the pump access, the pump must be a comprehensive and careful inspection in order to determine the maintenance items, bolt maintenance plan, the main inspection content is as follows: (1) measuring the vibration of the various parts, bearing temperature.
check the bearings for noise and determine the cause.
(2) the pump shell of each binding surface and whether Glen is leaking.
the operating log to understand the current, pressure, operating conditions and defects at full load, and to keep a record.
(3) check the bearing ball and inner and outer rings, if found cracks, corrosion spots, peeling, numb spots and other defects should be replaced.
(4) check that the outer surface of the heath is ground to 1/3 of the original thickness or that there are obvious grooves to replace.
(5) the fit gap between the heath and the shaft is 0.018-0.08mm.
(6) check the bending degree of the measuring shaft, should not exceed 0.1mm, the ellipticity and conicality of each shaft neck should not be greater than 0.03mm, and the surface without burrs, nuggets, grooves, threads on the shaft should be perfect, no slip buckle phenomenon.
(7) inspection, measurement shaft and bearing with over-profit, should be less than 0.01mm.
(8) check the coupling, shaft and key mate, coupling and key should be no gap on both sides, the top should be left 0.35mm-0.6mm gap, coupling and shaft mate for K8/h7 level.
(9) bearing outer ring is in conjunction with the housing K8/h7.
(10) check the inner surface of the root box for wear, grooves (especially axial grooves), the root of each interface position should be staggered 90-180 degrees, loose and appropriate, and there is a residual tightness.
(11) check that the outer radial wiggle of the imperm does not exceed 0.3mm.
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