Some Typical Phenomena in the Process of Air Compressor Maintenance

First, can not correctly judge and analyze the fault, blind disassembly is common.
Because some maintenance personnel do not understand the mechanical structure and principle, do not carefully analyze the cause of the failure, cannot accurately determine the location of the failure, and blindly disassemble the equipment with similar and similar ideas. As a result, not only the original failure has not been eliminated, but also new problems have emerged because of poor maintenance skills and technology. For example, a station 120KW diesel generator power is insufficient, machinery can not work. The maintenance personnel disassembled the PT fuel injection pump and injector, but failed to find the cause of the failure. After replacing one fuel injection pump, the fault still exists. The malfunction was caused by excessive impurities and moisture in the diesel fuel used. However, this disassembly resulted in a significant decline in the performance of the PT fuel injection pump and insufficient power of the diesel generator.
Therefore, when the air compressor fails, it should be tested by test equipment. If there is no detection equipment, the possible fault location can be determined by asking, looking, checking, testing and other traditional fault judgment methods and means, combined with the structure and working principle of the equipment.
When judging equipment failure, the exclusion method and comparison method are commonly used in the order from simple to complex, from surface to inside, from assembly to component. Blind dismantling of equipment is strictly prohibited.
Second, there are quite a few phenomena of not paying attention to detecting the fit clearance of parts.
For example, when repairing commonly used diesel generator sets, cylinder liner clearance, piston ring clearance, piston top clearance, valve clearance, plunger clearance, brake shoe clearance, meshing clearance between driving gear and driving gear, axial and radial bearing clearance, clearance between valve and valve guide, etc., All models have strict requirements, which must be measured during maintenance, and parts that do not meet the requirements must be adjusted or replaced. However, in actual maintenance work, there are many phenomena of blindly assembling parts without measuring the fit clearance, resulting in early bearing wear or ablation, diesel generator oil burning, difficulty in starting or deflagration, piston ring fracture, mechanical parts impact, and oil leakage, Air leakage and other failures. Sometimes, due to improper parts fit clearance, serious mechanical damage accidents may occur.
Third, the phenomenon of blind replacement of parts and blind replacement of parts maintenance exists to varying degrees.
It is relatively difficult to judge and troubleshoot the equipment. Some maintenance personnel always use the method of replacement test. Whether it is a large part or a small part, just replace the parts that are considered to be the cause of the failure one by one. As a result, the fault was not eliminated, and the parts that should not be replaced were replaced at will, which increased the maintenance cost.
Some faulty parts can be repaired to restore their technical performance, such as generators, air compressors, blowers, burners, gear oil pumps, etc., It can be repaired without complicated repair process. During maintenance, it is necessary to carefully analyze and judge the cause and location of the failure based on the failure phenomenon, repair the repairable parts, restore the technical performance, and prevent blind replacement of parts.