1 EL- 1P08 type motor car drawbacks (1) When the air compressor is finished at one end, there is a certain amount of compressed air in the pipeline from the air compressor to the check valve. The pressure is above 017 019 MPa. When the air compressor starts again, it increases. The starting resistance of the air compressor, the air compressor piston will withstand high back pressure, so that the crankshaft of the air compressor will bear a great impact in each start. Due to the frequent operation of the air compressor, the crankshaft of the air compressor is prematurely fatigued and aged, and the starting torque of the air compressor motor is also increased, so that the starting current of the air compressor motor exceeds the allowable range, and the commutation spark is intensified. , easy to burn the commutator, and even burn the motor. (2) When the locomotive is used in winter, the water vapor in the air will be liquefied into water during the operation of the air compressor. When flowing through the heat pipe, the shape of the heat pipe is curved, and water droplets will accumulate here. Icing due to low ambient temperature. The air compressor works frequently, and the ice accelerating speed in the heat pipe is very fast. The heat pipe is frozen in a few days. At this time, when the air compressor is working, the pressure of the compressed air quickly exceeds the pressure range because the pipe is blocked. Moreover, since the pipeline of the pressure regulator is connected to the total air cylinder, the safety valve is installed at the front end of the oil water separator, at which time the air compressor does not stop working, the overpressure air cannot be eliminated, and under the excessive resistance, the air pressure is caused. The crankshaft of the machine is broken or burned. EL- 1P08 compressed air system 11 compressor 21 heat pipe 31 safety valve 41 oil water separator 51 check valve 61 total air cylinder (3) The direct piping setting of the regulator and the total air cylinder is not reasonable enough. First, there are too many bends, and it is easy to accumulate impurities such as oil and water mixture. Second, the pipe diameter is too thin, and freezing is likely to occur in winter. After the blockage, the compressed air cannot reach the pneumatic part of the regulator. Even if the pressure in the total air cylinder has reached 019 MPa, the regulator cannot operate. The pneumatic signal cannot be converted into an electrical signal and supplied to the control circuit. The control circuit cannot break the high voltage circuit, and the air compressor continues to rotate. In this way, the air pressure between the air compressor and the total air cylinder will rise rapidly, forcing the safety valve to discharge the overpressure air. Since the air compressor does not stop rotating, the safety valve will repeatedly operate. In severe cases, the crankshaft of the air compressor will be broken, the motor will burn out, and even the pipeline bursts. Pipeline between regulator and total air cylinder Figure 11 Total air cylinder 21 Condenser 31 Regulator 2 Comprehensive improvement scheme 2. 1 Major improvement measures (1) Set a no-load electropneumatic valve, a valve, and a pneumatic relay with a setting value of 0195 MPa at the output of each air compressor. (2) Add a set of protection circuits to the original circuit. (3) Change the connecting pipe of the pressure regulator and the total air cylinder to the inch pipe, and straighten the pipe line. Improved air line Figure 11 Air compressor 21 No load valve 31 Air pressure relay 41 Radiator 51 Safety valve 61 Oil water separator 71 Total air cylinder 81 Check valve 2. 2 Improved working principle (1) No-load electric air valve circuit: When the battery switch is closed, the power supply is sent to the no-load electric air valve through the normally closed contact of the fuse and the intermediate relay. The current path is: Power y RDy ZJ1 Normally closed contact y F1(F2) y Ground. The unloaded electropneumatic valve is energized, opens the atmospheric passage, discharges the compressed air stored in the pipeline between the air compressor and the check valve into the atmosphere, and reduces the pressure to normal pressure; when the air compressor needs to be started, it closes K1 or K2, when the pressure in the total air cylinder is lower than 0. 7Mpa, QYJ1 will act, its micro switch contact will close, forming the following circuit: RDy K1 or K2 y QYJ1 y ZJ1 y Ground. The intermediate relay ZJ1 is energized and its normally open contact is closed to form the following circuit: RDy K1 or K2 y K5 y ZJ1 Normally open contact y ZJ2 Normally closed contact y C1 y Ground. Improved circuit diagram of the air system control circuit The low-voltage coils of the electromagnetic contactors C1 and C2 are connected to the high-voltage circuit, and the air compressor starts to work. The normally closed contact of ZJ1 is disconnected, so that F1 and F2 are discharged and the passage to the atmosphere is closed. The compressed air generated by the air compressor enters the total air cylinder through the pipeline. When the air pressure of the total air cylinder reaches 019 MPa, QJ1 Action, its micro switch is disconnected, ZJ1 is powered off, C1 and C2 are de-energized, the high voltage circuit is disconnected, and the air compressor stops working. ZJ1 is released and its normally closed contact is closed. F1, F2 receive electricity to discharge the compressed air stored in the pipeline of the air compressor to the check valve into the atmosphere, ready for the next start of the air compressor. (2) Pipeline freezing plugging circuit: When the pipeline is frozen, the pressure in the pipeline from the air compressor to the freezing plug is rapidly increased. When the pressure reaches 0195 MPa, (take the No. 1 air compressor as an example) The pneumatic relay QJ2 will be activated and its microswitch contact will be closed to form the following circuit: RD y K1 y QYJ2 y ZJ2 y Ground. The intermediate relay ZJ2 is energized, its normally closed contact is opened, and the control circuit of the electromagnetic contactor C1 is cut off. After C1 is disconnected, the high voltage circuit is cut off and the air compressor rotates. After the intermediate relay ZJ2 is actuated, its normally open contact ZJ2- 1 is closed, and F1 is energized to quickly discharge the overpressure air in the pipeline into the atmosphere. ZJ2 normally open contact ZJ2- 2 closed circuit: RDy K1 y ZJ2 y 2 y ZJ2 |) y ZD y Ground. This circuit allows the ZJ2 to be self-sustaining and will not be released due to a drop in air pressure in the pipeline. At the same time, the indicator light is illuminated, prompting the driver that the air compressor pipeline has been frozen. Even if the driver does not find it in time, the air compressor is automatically cut off due to the action of the ZJ2, and the fault will not be expanded. After the pipeline freeze block is removed, simply disconnect the K1 and K2 switches to release the ZJ2 state, release it, and return the control circuit to its normal state. (3) Expanded protection function: When the check valve freezes, the compressed air in the total air cylinder will flow back to the air compressor because the spool cannot be recombined. When the air compressor stops rotating and the unloaded electropneumatic valve discharges the compressed air under the action of the electric shock, the exhaust valve will not be exhausted due to the failure of the check valve. In this case, the driver can know that the check valve is frozen and can be closed at this time. The valve at the front end of the load electropneumatic valve is processed in time to eliminate hidden troubles. 3 Conclusion The improvement work requires less capital, and the cost of retrofitting each air compressor is less than 2,000 yuan, and the benefits are enormous. Because of the improved reliability of the entire system, the air compressor and its motor are reduced. Accidental damage, saving a lot of money, reducing the cost of locomotive operation, more importantly, ensuring that the locomotive brake system works normally, avoiding malignant driving accidents and ensuring railway safety. Composite Sleeper,Composite Metal Railroad Ties,Railroad Tracks Steel Sleeper,Long Life Composite Sleeper Anyang Railway Equipment CO.,Ltd , https://www.ayrailwayat.com
Analysis on the innovation of the new electric vehicle compression equipment system
The compressed air system of EL- 1P08 electric locomotive consists of air compressor, heat pipe, total air cylinder, oil-water separator and check valve. The function is to compress the air and increase its pressure to 017 019 MPa. In the air cylinder, it is used for the brake system of the locomotive and the electric air equipment. Therefore, whether the compressed air system can work stably affects the driving safety and the performance of the locomotive.