Analysis and improvement of emulsification of lubricating oil by using locomotive air compressor. Yu Yuling Shizhuang Guoxiang Precision Machinery Co., Ltd., Shijiazhuang, Hebei, 5,71 recommended.
The 15-person 330-person screw air compressor unit for diesel locomotives passed the 5-type test at the Diesel Engine Inspection Station of the Ministry of Railways Product Quality Supervision and Inspection Center in June 2002. After the small batch loading on the diesel locomotive. In the summer in the southern region, the unit was found to have emulsified oil during the operation. The result of severe emulsification of the screw air compressor unit is that the bearings used in the screw set are damaged due to oil loss. Therefore, the head sound or the nose is locked, and even worse, the motor will be burnt. As a result, the screw air compressor unit cannot supply the wind and endanger the driving safety.
1 Reason analysis After analyzing the lubricating oil emulsification, the following reasons are mainly due to the fact that the locomotive is running in the humid and rainy areas in the south, and the air humidity is high, especially in the rainy season, the humidity may reach 95 or more.
Therefore, the air collapse unit is inhaled, and contains the water equivalent of the plant. After compression, if the degree is low, there will be water precipitation. For example, the inhalation temperature is 30; the relative humidity is 90, the suction pressure is atmospheric pressure, and the exhaust pressure is 1000 absolute pressure. Check the dew point temperature of the compressed air to know that the pressure dew point is 74.5. If the exhaust temperature is higher than 74.5, the water will not be in the oil. Precipitate, otherwise water will precipitate. Now the temperature control valve for the 1330 unit is 71. The temperature of the oil and gas cylinder is controlled at 710 right. Therefore, in the above inhalation state, the compressed air will have water, and the water must enter the oil. Condensate + is discharged in time, and the lubricant will be emulsified for a long time.
The start of the friend machine is low, which will inevitably cause the exhaust gas temperature to be low. When the exhaust gas temperature is lower than the dew point temperature of the compressed air, it will cause the mechanical design and manufacturing of Hebei University of Science and Technology, a bachelor of engineering, and now mainly engaged in mechanical product lubricants. emulsification. The reason why the starting temperature of the unit is low is that the ambient temperature is low, resulting in a low starting temperature. The air compressor of the mountain 1 engine is installed under the cooling single room, and the high-power cooling fan for cooling the diesel generator is working continuously. This is a + cause for the air compressor unit because the air jade unit itself is intermittent motion. The temperature inside the oil and gas cylinder is working, and the temperature of the temperature control valve is tightened, but when the unit stops working, the temperature of the oil cylinder will drop, the cold air blown by the cooling fan will increase, and the temperature of the helium gas will drop. When the unit is restarted, the temperature control valve can not immediately kill the temperature of the oil and gas cylinder until the pressure dew point is reached, and the water will precipitate. Long-term lubrication will also be emulsified. In addition, the low operating rate of the air compressor is also the original culprits of low starting temperature. The operating book = 3O, 7, Kr5lM meets this condition, and the temperature control valve of the unit is equipped properly, the lubricating oil will not be emulsified. However, the operating rate of some locomotives is very low, which is far from the conditions mentioned, such as 20, 3 years, 9, 25 speculations, 1432, people; machine wealth, the screw hunter shrinking machine hunger number is 038002, the locomotive traction Nanchang Pingxiang 1857 trains run 280 trains 316, the air compressor unit's timer is operationally calculated and its operating rate is pulled by the 1557 trains in Nanchang Nanning. The air compressor unit number is 0380, and 12 air gauges are tested in Nanchang Fengcheng District. The working cycle, the starting time is 4975, the downtime is 38028. The operating rate, 8, the downtime is 35468, and the operating rate is 0=284284+3. As can be seen from the above three examples, the operating rate of the current air compressor is too low. The starting temperature of the machine hunger is low. This is also the emulsification of the lubricating oil. When the locomotive is running, if it happens to encounter the rainy weather, the internal pressure of the locomotive is negative during the walking process. The rainwater flows from the louver of the locomotive into the interior of the locomotive. It is highly likely to be inhaled by the suction port of the air compressor. Because when the air compressor inhales, small water droplets in the air will enter the compressor through the air filter. The reason is the water particle. The diameter is 0.060. The small water droplets of the air filter of the unit can pass through the filter paper freely. Some of the water beads condense into large water droplets when passing through the filter paper. Under the pressure, the filter paper may pass through to the compression. Emulsification of lubricating oil.
1 piece of screw gas compressor 纟 1. The machine forms condensed water will also make the oil simmer emulsification phenomenon, 1 after the shutdown, the ambient temperature and the change before the stop is not good. 1! The temperature of the suction air is set to be the same as the temperature and humidity in the oil and gas cylinder after the shutdown. The water content of the air after entering the intake valve will have the following conditions: The water content does not change, that is, the inhalation contains only gas phase water, and does not contain Liquid phase water, the injected lubricating oil does not contain water; when the minimum temperature of compressed air is not lower than its dew point temperature, the water vapor in the air will not condense. During the compression and expansion process, the water vapor in the air is constant. After shutdown, the compressed air returns to its original state without liquid phase water. When there is water mist in the air around the suction port of the compressor, the air filter cannot completely filter out the 100-size water droplets. At this time, the inhalation does not contain only the gas phase water and the liquid phase water. These liquid phase waters may become gas phase water during the compression process due to the increase of air temperature. After the shutdown, this part of the 7-foot vapor may partially condense and liquid phase water appears. Inhalation contains only gas phase water and no liquid phase water, but the water injected into the lubricating oil, that is, there is water in the oil and gas cylinder. During the compression process, due to the increase of air temperature, the water may partially become gas phase water after shutdown. This part of the water vapor may partially condense and liquid phase water appears. It is a change in ambient temperature after shutdown. The temperature is lower than before the shutdown. Since the temperature at this time is low, the amount of water vapor contained in the air can also decrease, and the water vapor more than the saturated humidity is inevitably condensed into liquid phase water. Condensed water may form in both cases. If the condensed water is not drained in time, an increase in the amount of water will emulsifie the lubricating oil.
2 Improvement measures The improvement measures are determined for the above various situations to increase the temperature control temperature. This will increase the temperature of the gas cylinder. In turn, the precipitation of condensed water of compressed air in the oil and gas cylinder is reduced. The heat insulating sleeve 5 is installed on the oil and gas cylinder so that after the unit is stopped, the temperature of the oil cylinder can be lowered, thereby increasing the temperature of the oil and gas cylinder when restarting. Improve the filtration accuracy of the air filter, thereby reducing the entry of external water droplets. 4 Increasing the operating rate of the unit and increasing the temperature of the oil and gas cylinder. The unit should discharge water regularly. Especially in summer 5, the lubricant should be checked every day for emulsification. If emulsification is found, the oil should be clarified and allowed to stand for 3510, free water is released, and the oil level is checked. If the locomotive round-trip time is not sufficient to clarify the oil, consideration should be given to clarifying the water release or replacing the new oil during the most recent extended parking time.
3Improved effect After the improvement measures were put forward, the screw air compressor unit for diesel locomotive was modified to improve the control temperature of the temperature control valve from the original 7 to 80. At the same time, the oil and gas cylinder of the unit was installed. Insulation sleeve, the temperature of the oil and gas cylinder has been significantly improved1; the air filter is selected from a German company's product, the filtration capacity of 3 is 99.9, and the 1 is 99.5. This makes the effect of the filter high, the unit Increased operating rate. Only Xu is in the machine factory, and the line 1 is changed. Force the single machine to supply air during the normal running of the locomotive, or rely on the driver to perform single-unit air supply during the operation, so that the operating rate of the unit can be improved. Up to now, no emulsification of lubricating oil has been found, which proves that the improved measures are effective at the same operating temperature and the same operating rate of the same humidity, with different temperature-turning valves and oil and gas cylinders installed with insulation sleeves. Oil and gas cylinder temperature control.
Air compressor state ambient temperature startup time downtime oil and gas cylinder temperature 7 temperature control valve, no installed insulation sleeve 7 temperature control valve installed insulation sleeve oil and gas cylinder temperature air compressor state ambient temperature startup time downtime oil cylinder temperature 7 temperature Control valve, add insulation sleeve 80 temperature control valve installed insulation sleeve oil and gas cylinder temperature air compressor state ambient temperature startup time shutdown time oil cylinder temperature 80, temperature control valve, install insulation sleeve through the comparison can be found to improve the temperature control valve The effect of temperature and oil cylinders on the insulation jacket is obvious.
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