Electric air compressor before bearing analysis of the causes of damage
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Abstract: The air bearing motor before the cause of the damage, identify the root causes to be eliminated, and to develop appropriate preventive measures.
Key words: Bearing; lubrication; overload; damage
Key words: TM307.1 Document code: B
 
     I air separation plant installations in the air is 2 four piston compressor, the compressor in a lack of parking extinction, a few days ago in view of the motor bearing lubricating oil pressure than ever before rising slightly to end .05 MPa (normal For 0.025 ~ 0.04MPa), to identify the causes of motor bearing on the inspection found that the former has a black tile axis Babbit-off, under the surface Wawa black paste lubricants have a taste, lubricants hole on the tile Babbit was blocked; after bearing intact.
The following are the reasons for the failure analysis and processing.
First, the electrical changes in the way of bearing lubrication
Bearing off with the original motor oil lubrication ring. However, due to motor speed is not high, oil off ring too, the use of existing in the oil ring rotation inflexible, and even stuck. To that end we had a way of lubricating the improvement in the tile on the seat of a through-hole drilling, a small increase in the pump, respectively before and after the compulsory bearing lubrication, the use of parallel manner.
Second, the reasons for failure analysis
Inspection, the black tile on Babbit off Jiediao layer, exposing the Babbit planing bright and clean, bright color, thickness measurement off about 3mm. Check under the tile, black tile surface, Babbit thickness of about 2.5mm, which I gather that the damage to the bush in the process; under the tile for some reason is the high temperature melting, the liquid alloy shaft was brought up after the tile lubrication Oil cooling in the tile on the surface of the heap, and the formation of the Babbit-off, and will block the hole.
It appears under the tile is a high temperature causes. Further analysis of the view that under the tile is overloading warming. Watts in the next overload, the film is damaged, with the axis-watt metal surface contact, Babbit in the dry friction under high-temperature melting.
Check with the electric compressor coupling of the situation found in the electric compressor than round the back wheel than crankshaft back more than 0.6mm. However, in looking at the last overhaul, slightly lower motor, compressor that sink. Two months ago, the maintenance of patrol officers found a compressor body tremors, fastening bolt, which can be tightly fixed the problem. The situation can be judged by the failure by the compressor crankcase trace caused by the sinking, motor crank shaft lower than that of the motor shaft to exert a downward, and as a result of overloading watt motor under the front axle.
Third, the failure to address the situation
1. Pre-watt motor replacement.
2. Bearing good adjustment after the coupling of the unit are looking for in the request and end-all control in the outer circle beat 0.05mm or less. 3. Bearing assembly, box bearing on the way lubricants and carried out a thorough cleaning to ensure that no residue.
Failure has been dealt with, electric start, normal operation.