A series of faults caused by inadequate repair of synchronous gears 1. Case background The customer had an abnormal vibration and sound during the start-up operation of a Roots fan, which was forced to shut down and had an impact on production. The equipment preliminary inspection showed that the vibration value of the drive side seriously exceeded the standard. The customer then sent the equipment to our company for in-depth disassembly and repair. 2. Fault phenomenon and preliminary judgment After the equipment arrived at the factory, our maintenance engineer conducted preliminary operation tests (under the premise of ensuring safety), and indeed the driving end vibrates greatly, far exceeding the standard value; based on experience, our engineer judged that the root cause of the failure may be due to rotor dynamic balance failure, bearing damage or rotor meshing and other problems, and decided to dismantle and inspect immediately. 3. Deep disassembly and fault analysis cause of failure: After disassembly, it was found that the root cause of the failure of this equipment is that the customer's previous repair process for the synchronization gear is not in place or that this repair solution is technically undesirable. Evidence of failure: dismantling
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Precautions for oil leakage at the oil pipe joint
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1. Compressor maintenance case analysis Recently, a customer in the factory sent a screw compressor for repair. The customer reported that the machine had a low oil pressure and the equipment was stopped, and then the equipment was stuck. After disassembly inspection by the maintenance department, it was found that the radial and axial bearings of the exhaust end of the male rotor were damaged due to oil deficiency, and the oil holes of the oil injection plate were also blocked. It was analyzed that the direct cause of bearing damage was that the customer did not replace the old oil filter in time during use, causing the residual impurities inside the oil filter to enter the oil circuit system as the equipment operates. Since the injection plate is located at the end of the oil circuit system and the diameter of the injection hole is small, these impurities can easily clog the injection hole, causing a series of failures.
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Compressor repair case background
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