Accident fracture accident of the hottest compress

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Accident fracture accident of compressor

crankshaft fracture: most of the fractures are at the fillet transition between the journal and the crank arm, and the reasons are roughly as follows: the transition fillet is too small, R is the crank 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, the energy-saving design standard jgj75 ⑵ 003 for residential buildings in hot summer and warm winter areas worsens the stress condition; The material itself has defects. For example, our machines have been exported to the United States, Canada, the Middle East and other countries. The castings have sand holes, shrinkage porosity and so on. In addition, it can be seen that the oil hole on the crankshaft cracks and breaks. Fracture of connecting rod: there are several situations as follows: 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, because other parts cannot be separated from the use and damage of lightweight materials such as high-strength steel, magnesium alloy, high-performance plastics and carbon fiber composites, the piston rod may break when it is strongly impacted

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 accident

having quarterly maintenance can be said to be a big maintenance plan. Carbon deposition often occurs in oil lubricated compressors, which is what we don't want, because carbon deposition will not only make the piston ring stuck in the groove, the air valve works abnormally, and reduce the area of the air flow channel, increasing resistance, but also burn under certain conditions, resulting in compressor explosion accidents. Therefore, the lubricating oil in the cylinder cannot be supplied too much, 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 and nitrogen, causing an explosion. Due to lack of operation knowledge, the valve from the compressor to the air storage tank was not opened after the start-up, 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

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