DH-80 Turbine Air Compressor Abnormal Fouling Fault Treatment Huang Jian used to monitor the DCS of the lm3/h oxygen generator unit to generate an alarm, and retrieved the alarm signal to find the D-direction and third-stage A-direction vibration of the DH-80 air compressor. The values ​​are 63|xm and 50|xm (the vibration of each stage of the compressor is measured as a double probe, respectively X and F directions) and an alarm is generated if the value exceeds a predetermined value. The vibration parameters are set to one level 2 > 58 | xm alarm, > 70 | xm interlock parking, third and fourth level > 53 | xm alarm "651X111 interlock parking. According to the past experience, the personnel were immediately sprayed several times on the impellers of the air compressor, but the vibration value decreased not much, still reaching 60|xm and 53|xm. Read the trend line of DCS hollow press vibration monitoring data, showing a pole The slow vibration rise process and the increase in bearing temperature lags behind the vibration and the increase is not significant. According to the experience, the reasons for the damage of the sliding bearing and other parts are temporarily ruled out, and the vibration of the bow is raised. At the same time, in order to eliminate the instrument factor, the interlocking of the equipment and the second, third and fourth axis The vibration probe lead is monitored and the vibration position is also changed accordingly. Based on the above factors, the main cause is that the impeller dynamic balance is destroyed, but the reason is to be investigated.
Since the lOOOOmVh oxygen generator was unable to stop for maintenance at that time, and the air compressor changed the original elliptical split dynamic sliding bearing to five tiltable dynamic pressure sliding bearings in December 2004, the bearing capacity of the bearing was The double oil wedge is changed to a five oil wedge. In the case of no parking, the only way to improve the carrying capacity is to change the viscosity of the lubricating oil. Based on this, several emergency measures are taken to increase the bearing capacity of the bearing and reduce the influence of dynamic imbalance factors on the operation of the equipment. Add a quantity of 46 turbine turbine oil to the tank and mix it with the original 32 turbine turbine oil during operation. Increase the oil cooler cooling water volume and the lubricating oil temperature. Increase the number of water sprays from once a month to once a week to reduce the damage caused by uneven impeller scale. After the implementation of the measures; SS vibration values ​​and temperature have decreased. J alarm is basically eliminated or in the e-bound state.
In October 2005, the compressor was dismantled and repaired, and the bearing surface and clearance were not abnormal, but the impeller scale was found to be serious. When the scale is removed, it is found that the scale adheres to the impeller quite strongly and the previous scale is very different. At the same time, it was found that there was a lot of rust on the inner wall of the gas passage, and the paint used for rust prevention was seriously detached. It was judged that the rust block and the paint were washed by the high-speed high-pressure airflow and then hit the high-speed rotating impeller and adhered thereto, and could not be removed by flushing. JDD's fouling is uneven, which destroys the dynamic balance of the impeller. Paint 0 is not related to the quality of the paint, but also has a great relationship with the last maintenance period, the paint is not dry after the paint is painted. Therefore, in addition to the conventional steam cooking and descaling of the impeller, a paint stripper is used for descaling, and the descaling is re-calibrated. At the same time, the gas passage wall is descaled and rusted again to select high-quality suitable paint for anti-rust treatment, and the surface of the repainted surface is baked to make the paint dry. After taking measures, the reloading vibration value and bearing temperature are normal.
During operation, the inhalation of solid particles and dust in the air is reduced, and the solid particles are prevented from adhering to the impeller, thereby breaking the dynamic balance and shortening the replacement period of the air filter core, and the effect of the filter core backflushing ash removal. At the same time, extend the water spray time to clean the scale on the impeller as much as possible.
During each inspection, carefully check the condition of the gas passage wall. All kinds of substances that may be zero-fall should be removed to prevent the larger solid particles from impacting the impeller. The rust inhibitors used should be resistant to high temperature and high pressure, strong against air flow and impact resistance. Descaling of the impeller should be carried out with a complete balancing accuracy of G1. There can be no bumps or the like in the reloading.
Strictly in accordance with the maintenance work instructions, especially the sliding bearing clearance must be within the specified range, the gap is too small, so that the sliding bearing temperature is high or the burning gap is too large, the vibration high affects the stability of the air compressor operation. A simple method for discriminating the polarity of brushed DC servo motor at No. 8 Shilin Avenue, Area C, Jianqiao Industrial Park, W12.09-45. Zhang Hong brushed DC servo motor needs regular maintenance after repair due to carbon brush and commutator wear. The motor coil and the tachogenerator coil will be re-wired. Different people will make different marks at different times. Others may not understand or mark and cannot distinguish. A simple method for discriminating the polarity of a permanent magnet brushed DC motor is described below with reference to an example.
Shennan Circuit Co., Ltd. Internal Corrosion Process A, 1 and Z-axis servo motors of single-axis X-ray drills are permanent magnet DC brush motors with tachogenerators (integrated structure). After the servo motor has been used for a long time, the commutator has been worn out for many times, and the lead-out connector has long been lost. The wiring is easy to make mistakes when replacing the servo motor. The permanent magnet DC brush motor and the tachogenerator have two sets of coils and four lead wires. When replacing the servo motor, the wiring must be correct. Otherwise, the double closed loop automatic control system will run incorrectly.
Using the reversible principle of the DC motor, before replacing the servo motor, find the same end line of the two motor coils and press the corresponding end of the same name to ensure that the two sets of coils of the servo motor and the original servo motor have the same polarity. The specific method of finding the same name end is to separate the motor lead wire by hand to quickly rotate the servo motor rotor and measure the motor coil with a multimeter. The two-pole lead-out line has a self-induced electromotive force of ~3V and the positive and negative poles are marked on the lead-out line.
Similarly, the positive and negative poles of the tachogenerator coil are measured, and the two motors are the terminals of the positive pole. [Editing Lingrui] Equipment Management and Maintenance 2012No9
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