Analysis and solution of abnormal vibration of air compressor shaft
At present, the detailed analysis of the normal operation of the air separation plant has affected the cause of the abnormal vibration value of the air compressor shaft, and the measures for the normal vibration value of the air compressor shaft are proposed. 1 Introduction to Air Compressor Henan Yuguang Gold & Lead Co., Ltd. has two sets of air separation plants, which are from 1.40,800 and 1 and 0,6000200180 respectively, and the supporting air compressors are 44,6.20. Models 98 and 16332 are centrifugal card retractors. Both air compressors adopt an integral gear type structure, 4-stage compression and 3-stage cooling, and the large-gear is driven by a synchronous motor through a gear coupling. The stage impeller is on the root gear shaft, and the stage impeller is respectively increased in speed with the human gear biting large wheel on the root shaft, and the motor speed is 150, 1.14406. 98 type air compressor stage rotor speed 12387 32 air compressor stage rotor speed 95l2Vmm, l stage rotor speed 47 each rotor has 2 radial tilting pad bearings, oil pump forced lubrication lugable bearing 5 The tiles are evenly distributed in the circumferential direction. The arrangement of the bushings is concentric with the main journal, the tiles are made of steel, the inner holes are cast with babbitt, and the blocks are mounted. In operation. The position of each tile from its fluid dynamics as it rotates with the journal. Therefore, to pay a tile, Jiayu wedge, the gap between the hills of the mountain factory, the oil film is not continuous. The instability associated with the rotation of the oil film is difficult to form. Each stage of the impeller shaft is equipped with two vibration measuring points, which are distributed 90 degrees above the rotating shaft. The eddy current sensor is used. After the extension cable is connected to the preamplifier, the input 1 is quasi-pressured. can. The instrument pull cabinet 1 frame type monitor processing. Output standard analog signal and 13 screw system display, participate in alarm interlock. Air compressor structure and measuring point distribution Received date 20330 Co., Ltd. Oxygen plant engaged in technical work, 2 failure analysis two medium-pressure machines have been running for many years. A number of shaft vibration abnormalities have occurred. The abnormal axis vibration of the same state is analyzed to find a solution to the abnormal axis vibration. In the phase of the rotor material of 21, there was an abnormal failure of the shaft vibration value twice and the sudden over-range interlocking parking failure occurred after the shaft vibration value gradually increased during the operation in 20.4. When the inspection was opened, it was found that the impeller was cracked or dropped, causing serious damage to the rotor dynamic balance. This kind of failure rarely occurs on air separation equipment, which is the quality of product manufacturing. 22 long-term operation of the impeller on the impeller with ash to July 2008, the occurrence of the grade axis vibration value 1 in the measurement point 3 people 384 people 48 slowly rise, and beyond the alarm value 64.75 to reach 7080 and the shaft vibration is basically stable. During the shutdown inspection, it was found that the impeller accumulated more ash, and because the condensate drainage of the interstage cooler was not smooth, there was scale on the back cover and the impeller, and the existence of the dirt caused the rotor dynamic balance to be destroyed. The inter-stage cooler was inspected and found to have serious corrosion on the inner wall and a lot of rust on the bottom. The two sets of rotors are subjected to flow path cleaning and inspection to check the dynamic balance check, and the shaft vibration value is normal. At the same time, the inner wall of the interstage cooler is completely derusted and anticorrosive, and the condensed water is blown off by the tube by IN25mmjfljDN5Omm to prevent operation. Condensed water accumulates at the bottom and is carried away by the air stream, which in turn flushes the impeller. The value rose again and rose within a month. 20, reaching 571; the vibration value of the shaft is relatively stable, not exceeding 27, 1. It is still solved by cleaning the impeller to correct the vibration. 1 2.3 watt damage. August 2008, deal with the volume of å“32 air compressor outlet After the pipe collar is leaking, the original shaft vibration value continues to rise. The vibration value of the shaft is increased by 30 plus before the maintenance, and the vibration value of the 531 shaft is increased by 13 to 37. 1. The level is found when the machine is stopped. The tile is damaged and the babbitt is peeled off. The history of 1 block processing is stable, and the standby shaft vibration 伉 does not exceed 2.4. The bearing clearance is too small. The contact surface of the tile is dirty. In recent years, the 4406.0.98 air compressor frequently has abnormal fluctuations in the sinusoidal waveform of the shaft vibration values. Sometimes the fluctuations are a few micrometers and sometimes a few dozen micrometers, sometimes sudden rise or sudden with a sudden change in bearing temperature 2, around. Open the bearing inspection and find that the tile is not damaged, but there is oil accumulation on the tile surface, resulting in a small contact gap and poor contact surface. However, the test result of the lubricating oil is qualified for the oil quality. Sometimes many oil slags can be found on the large gears. Although the test results of the lubricating oils are qualified, the possibility of enamel changes under certain operating conditions is not excluded. Each time the oil accumulation is removed, the vibration value of the rear axle is stabilized and the Shell brand is selected. After the turbine oil was used as the lubricating oil, no carbon deposits were found on the bearing surface during the inspection. When the air compressor was running, the shaft vibration position did not show abnormal fluctuations in the sinusoidal waveform. 2.5 instrument control point fault repair after start-up operation, the two axis vibration value of the level 1 point 2838 is not normal measurement point 38 axis vibration value straight up to ten measurement point 21; the axis vibration position fluctuation amplitude is large. I had to stop the inspection again and found that the fastening nut of the fixed sensor loosened off between the sensor tip and the rotor main shaft, and friction occurred with the rotation of the shaft, which affected the measured value = Yin is re-examine the vibration value measurement point of each axis, and tighten the sensor The fixing nut is normal after the air compressor is running. Sometimes the sensor and the extension cable connector are oily and the measured value is incorrect. The preamplifier has a long operating time and a linearity difference, which also causes the shaft vibration measurement to fluctuate. 26 Motor and compressor unpaired press construction should be in accordance with the instructions, the coaxiality should be qualified. In the month of 2005, the 6332 air compressor was stopped due to the increase of the shaft vibration value. During the inspection, the motor and the compressor were found to be unqualified. When lifting the motor adjustment, it is seen that the horn under the motor is not standardized to use the channel steel instead of the horn and some of the channel steel has been deformed; the grout layer is also not in compliance with the specification, and there is a phenomenon of strontium iron 1 The horn and the motor framing are tightly combined, which leads to the motor and the squeezing machine 3 in the running process. The manufacturer must guarantee the quality of the product. And the inch rotor is big; people. These core components of the wheel must be reliable. For example, the impeller used in the 06332 air compressor is made of 3028 high-strength stainless steel, which has never been cracked after the operation of the shirt. The installation of the unit must ensure the construction quality in strict accordance with the requirements. Coupling centering bushing clearance anchor bolts tighten the bearing cap and bearing clearance. Rotor. Sealed gap. The motor foundation and so on must meet the relevant technical requirements. Lubricating oil is periodically tested and replaced. Residual oil should be drained each time the oil is changed. Clean and tidy. Filter case cooler, etc. The oil products are selected from regular manufacturers of regular channels. Careful operation, to avoid the compressor operating point into the surge zone and cause damage. Before each start-up, the reliability of the interlocking oil pump interlock start and stop and anti-surge valve action must be tested. When adjusting the load, be careful not to overpressure. Strictly control the parameters according to the equipment operation rules, avoid the oil temperature is too low and too high, the oil pressure meets the requirements, the operation should be smooth and slow, and the people will not be fired. 6 clear the number of times to stop the shutdown. Every time the man-machine sister moves, a large vibration occurs, and the inch bearing bush is damaged. Therefore, it is necessary to reduce the number of starts and stops, to avoid sudden shutdown of the unit with load, and to force the inspection of the electric line to maintain the maintenance, and to pay for the machine every year. People repaired. Follow the instructions; require an interstage cooler. Compressor 纟. The lubrication system is thoroughly maintained, and the rotor is subjected to flow path cleaning inspection to check the dynamic balance test. The interstage cooler core inspection checks the inner wall corrosion and conducts corrosion prevention. Etc., each time the inspection is completed, the instrument personnel must adjust and fasten the sensor nut. The gap voltage should meet the technical requirements. The connection points are firm and reliable, and the measurement error is prevented. 9 guide installation air compressor online monitoring and fault diagnosis system. Introduce new vibration measurement and judgment technology, and monitor the major units online. So that you can find the call in time and deal with it as soon as possible. It can also improve the modernization level of equipment processing. Zhu Yuyuan. The cabinet is brave. Modern air separation sets the operating principle of each technology. Hangzhou Hangzhou Publishing House, 2005. The National Gas Separation and Liquefaction Equipment Standardization Technical Committee was established. On September 8, 2010, the National Standardization Management Committee issued a document on the National Standardization Committee No. 201065, which approved the establishment of the National Gas Separation and Liquefaction Equipment Standardization Technical Committee. The standardization committee number is 3 people 01504. The English National Technical Committee for Standardization of Gas Separation and Liquefaction Equipment is composed of 27 members. Zhu Yiyuan is the chairman, Jin Yucheng Cheng Zhizhi is the vice chairman, and Ma Guohong is the member and secretary general. The secretariat is responsible for the Hangzhou Oxygen Machine Research Institute. The National Gas Separation and Liquefaction Equipment Standardization Technical Committee is mainly responsible for the revision and revision of national standards in the field of gas separation and liquefaction equipment! Work. The China Machinery Industry Federation is responsible for the daily management and standard project approval and other business guidance. Journal
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