use. Analysis and treatment of the emulsification failure of the type 5 air compressor oil. Li Jinzhong became the technical center of the locomotive and rolling stock factory. The Chengdu 6100515 air compressor has been widely used in railway locomotives. This type of air compressor is intercooled with cylinder upright air compressed air and equipped with an air intercooler. The common faults of this type of air compressor are mainly low exhaust gas, high exhaust gas temperature, high temperature, high temperature, no oil pressure, low oil pressure, low cylinder pressure and piston strain, etc., and oil emulsification failure Less technical information is introduced. It is not easy to bury, and the handling of faults is also large, which affects the safety and application of locomotives.
1 Fault Overview Air compressor oil emulsification failure occurs in the operation of our factory and the locomotive section. For example, the air compressor of Type 4 0403 locomotive has oil emulsification failure in the factory. Although the oil has been replaced twice, the fault has not been eliminated. Finally, I had to replace the entire air compressor; Xinyang Locomotive Division, type 0503 locomotive overhauled after leaving the factory for one month, went through 6000 air compressor oil emulsification failure, after repeated oil replacement check valve and air filter And the piston ring is invalid, and finally the air cooler is replaced to eliminate the fault.
The main problem of oil emulsification is that after the use of the time, the color of the oil in the oil of the jade machine turns into milky yellow. Most of the faults occur in the summer. After the oil is emulsified, the condition of the air compressor will be deteriorated, and the air compressor will be burned. 1. The cylinder will be bitten.
2 failure cause analysis of oil emulsification; 1 air compressor body water inlet air compressor in the operation of water and oil mixed and dissolved, the air compressor body tank water inlet has the following aspects from the original 2.1 condensate into the water In the fuel tank of the body, the normal pressure of the compressed air discharged from the low-pressure cylinder exhaust valve of the embossed air compressor into the air intercooler is about 0.30, and when it exceeds 0.451, the safety valve on the intercooler acts and relieves the pressure. After the compressed air discharged from the high-pressure cylinder exhaust valve enters the total air cylinder, the air compressor inlet pressure is the air compressor exhaust pressure; 〃 is a constant greater than 1.
It can be obtained that the temperature of the compressed air increases with the pressure of 1 liter of the pressure of the air compressor, and the compressed air must be cooled by the low pressure cylinder before entering the high cylinder, which will affect the high pressure cylinder. Working, the temperature of the air discharged from the high-pressure cylinder can reach 100, which should not exceed 19 according to the overhaul regulations. Since the water in the natural environment will vaporize, the air always contains some water vapor, which is called air, air temperature. Next, when the amount of water vapor contained in the humid air is increased to a certain amount, it reaches a saturated state, which is called saturated steam. At this point, condensate is separated from the humid air. If the water vapor content in the humid air does not change and the temperature of the humid air drops to a certain level, the water vapor in the wet air will also reach saturation, which is called the dew point of the water vapor. If the temperature of the humid air drops again, condensed water will precipitate in the humid air.
The above-mentioned water vapor state change principle can be transported (1) to the oil emulsification failure analysis. In the summer, the air contains more water vapor, and the relative humidity of the air in some areas can reach 80 or so, that is, the water vapor content in the humid air reaches the saturated water vapor. 80. The empty gas that is sucked during the work of the empty machine is containing water vapor. The water vapor is heated in the cylinder with the humid air, and is compressed by the low pressure cylinder and then cooled into the intercooler. The amount of water vapor does not change during cooling. According to the condensation principle of 7-foot steam, when the compressed air is cooled to the temperature of the water vapor saturation state and below, condensed water will be deposited on the wall of the intercooler cooling pipe and in the pipe, and accumulated in the air cooler under the air compressor. In the Gehry, a small amount of condensate also enters the high pressure cylinder with compressed air. Daily use of the hollow press every 10,1 should open the drainage block drainage. If the drainage hole is blocked or the drainage is not regularly opened, the water accumulated in the lower cover of the air compressor intercooler will enter the high pressure cylinder with the compressed air. Or the brakes are used to become the source of oil emulsified water.
Due to improper assembly or fittings, water will enter the body tank from the pressure cylinder and cause oil emulsification. The specific leakage causes are as follows.
(1) When the air compressor is overhauled, the joint gap of the piston ring is large.
The hall is controlled in the 10.50.8 range, and if the water exceeds the standard, the water entering the high-pressure cylinder will easily leak into the tank.
The adhesion between the piston ring of the high-pressure cylinder and the cylinder wall is as small as required. When the overhaul is assembled, the radial non-adhesive range of the high-pressure cylinder piston ring and the cylinder wall is controlled within 30 arc angle arc length, and the gap is not more than 0.02. If the adhesion is poor or the running-in is poor, it is easy to become a leak point.
The lateral clearance between the piston ring and the ring tip is not required. People, and when installing, the piston ring and ring groove lateral clearance is controlled within 0.01150.1 Fan, 7, which exceeds the standard is also easy to become the leakage point 2.2 check valve bad air compressor exhaust to the total air cylinder There is a check valve between them to prevent backflow of compressed air in the total air cylinder. The high-temperature compressed air discharged from the air compressor will also have condensed water deposited after cooling in the pipeline, and some of it will accumulate in the pipeline. When the check valve does not work. When the air compressor is working, The water will flow back to the high-pressure tank of the air compressor with the pressure air. In turn, it causes the emulsification of the machine. The body of the air compressor with the water air compressor is disintegrated and boiled. The water stored inside is not cleaned. After the air compressor is repaired and assembled, the machine body is filled with water or boiled liquid. The oil emulsification failure caused by this reason will be eliminated as long as the oil is replaced. 3 Troubleshooting steps and methods When oil emulsification occurs, you can press 1 step. Hall inspection and replacement of accessories 1 Open the intercooler under the cover drain hole to plug the water, and check whether the drain hole is normal and smooth. Make sure that the drain hole can be 7 feet in a row. By checking here, it can be determined whether the fault is caused by the drain hole clogging or too much water accumulation. Check whether the check valve starts and stops. If the total air cylinder pressure air compressor does not hold the pressure after the air is blown, the holding time is short. When there are no other air leaks, the check valve should be treated or replaced.
Check the piston ring of the high-pressure cylinder piston ring gap and the gas seal. The gap between the dip ring and the ring groove is used to replace the poor piston ring. If necessary, replace the defective piston and the Coats. Add filter material such as brown wire to the air filter to filter out the moisture in the air.
4 Conclusion Since 2004, the air compressor of our factory for inspection and loading has been used in and out of the factory. The incidence of engine oil emulsification has dropped significantly. Due to proper disposal, the fault can be eliminated in time, which reduces the impact on the normal operation of the locomotive. This leads to the occurrence of emulsification failure of the air compressor oil, such as the long service life of the oil. Here is the discussion.
1 Shen Weiwei. Wait. 1 course thermodynamics 1. Beixin Renmin 7 out. , Meishe.
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