Accident and cause analysis of the hottest compres

2022-09-22
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Compressor accident and cause analysis

fault refers to the abnormal condition of the compressor in operation. Once eliminated, the compressor can resume normal operation, while accident refers to the damage. The two are often related, and major accidents will be caused if faults are not eliminated in time

compressor accident and causes

fracture accident crankshaft fracture: most of its fractures are at the fillet transition between the journal and the crank arm

the reasons are as follows: the transition fillet is too small, R 0.06d (D is the crankshaft neck); During heat treatment, the fillet is not treated, resulting in stress concentration at the junction; The fillet processing is irregular, with local section mutation; Long term overload operation, and some users casually increase the speed in order to improve the output, which worsens the stress condition; The material itself has defects. In addition, the castings have sand holes, shrinkage porosity, etc. In addition, it can be seen that the oil hole on the crankshaft cracks and breaks

fracture of connecting rod: there are several cases in the key to identify the authenticity: fracture of connecting rod screw, the reasons are: plastic deformation of connecting rod screw caused by long-term use; The poor contact between the screw head or nut and the end face of the big head produces an eccentric load, which can be as large as seven times that of the bolt under the simple axial tension. Therefore, no slight deflection is allowed. The contact should be evenly distributed, and the maximum disconnection distance of the contact point should not exceed 1/8 of the circumference, that is, 450; There is a problem with the processing quality of bolt material

piston rod fracture: the main fracture parts are the thread connecting with the crosshead and the thread fastening the piston. These two parts are the weak links of the piston rod. If due to negligence in design, carelessness in manufacturing and operation, fracture occurs more often. If there is no problem in ensuring the design, processing and material, the preload shall not be too large during installation, otherwise the piston rod will break when the maximum force reaches the yield limit. After long-term operation, due to the excessive wear of the cylinder, the piston in the horizontal column will sink, resulting in additional load at the connecting thread. If it continues to operate, it may break the piston rod, which should be paid special attention to during maintenance. In addition, when the piston rod is strongly impacted due to the damage of other parts, the piston rod may be broken

cylinder and cylinder head rupture: main reason: for water-cooled machines, if you forget to drain the cooling water in the cylinder and cylinder head after running and stopping in winter, the cooling water will freeze and break the cylinder and cylinder head, especially in northern China, the cooling water must be drained after stopping; Due to the interruption of water during operation and not found in time, the temperature of the cylinder rises, and the cooling water is suddenly put in, so that the cylinder is cracked; Because the dead center clearance is too small, the piston nut is loose, and the metal falling into the cylinder and the screw plug on the piston come out, the piston will hit the cylinder head and break it

combustion and explosion accidents there is often carbon deposition in oil lubricated compressors, which we don't want, because carbon deposition will not only cause the piston ring to get stuck in the groove, the air valve to work abnormally and reduce the area of the air flow channel to increase resistance, but also burn under certain conditions, leading to compressor explosion accidents. Therefore, the lubricating oil in the cylinder cannot be supplied too much until the sample is destroyed, and the gas containing a large amount of dust that has not been well filtered cannot be sucked into the cylinder, otherwise carbon deposition will be formed and contact with the gas containing a large amount of volatile matter will lead to explosion. In order to prevent combustion and explosion, it is necessary to plan maintenance and regularly clean the oil dirt of air storage tanks and pipelines

in addition, the compressor combustion and explosion accidents are also caused by the following operational reasons: the compressor did not use low-pressure nitrogen to drive the air clean before the hydrogen load test run with hydrogen, oxygen, nitrogen and hydrogen, causing an explosion. Due to lack of operation knowledge, there was no dead weight of the frame (including loading shaft, sample fixture, etc.) set during the manufacturing of the constant speed experimental machine after driving. 367.5n opened the valve from the compressor to the air tank, resulting in a sharp rise in exhaust pressure and explosion. Therefore, to prevent such accidents, you must be familiar with the operating procedures before starting, and pay close attention to the value of the pressure gauge after starting. In general small and medium-sized compressors, it is best to cancel the gate valve on the pipeline from the compressor to the air storage tank, leaving only the check valve. In addition, compressor operators should receive pre job training

due to the tightness of the high-pressure stage gas valve of the compressor, the high-pressure and high-temperature gas returns to the cylinder, causing high temperature near the exhaust valve. When there is carbon deposition, it will cause an explosion. In order to avoid accidents, the exhaust valve must be repaired at this time, and the air leakage part must be checked to eliminate the fault

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