Troubleshooting method for water ingress of lubricating oil in permanent magnet air compressor
3 types of air compressor lubricating oil water ingress faults
1. The accumulation of condensed water causes the oil level reading to be wrong
According to the operation requirements of the permanent magnet variable frequency air compressor, the air compressor should have a minimum running time to prevent the formation of condensed water, because the condensed water will cause the cylinder valve plate, frame parts, etc. to rust. Condensation buildup in the crankcase can cause false oil level readings. Water and oil do not mix, and their presence together causes the oil to spoil quickly. The minimum running time is generally not less than 10 minutes, which should be enough to heat the air compressor to vaporize and condense the moisture. At present, the running time of the air compressor is 7 minutes, which obviously fails to meet the requirements.
2. The water content of the exhaust of the permanent magnet frequency conversion air compressor seriously exceeds the standard
Due to the long shutdown time of the permanent magnet variable frequency air compressor, the moisture generated by the exhaust gas gathers around the pipeline and the check valve, causing the moisture to flow back into the chassis, and the water content of the lubricating oil gradually increases, eventually causing the permanent magnet variable frequency air compressor oil bit alarm and shutdown. When the outlet pipe of the air compressor was shut down and removed, it was found that there was a milky white liquid flowing out of the pipe, which indicated that the water content of the exhaust of the permanent magnet variable frequency air compressor was seriously exceeded.
3. The gas-water separator cannot separate the moisture generated during the compression process well
The outlet pipeline of the permanent magnet variable frequency air compressor is equipped with a check valve. The high temperature and high pressure humid air is discharged through the exhaust valve of the air compressor. The second and third interstage coolers and the final cooler of the compressor are all equipped with gas-water separators to separate the water generated during the compression process, but the actual operation effect is not ideal.
Lubricating oil water treatment method
1. Automatic sewage solenoid valve:
An automatic sewage discharge solenoid valve is installed at the bottom drain of the oil-water separator, and the automatic sewage discharge interval is set to 2min, and the sewage discharge time is set to 5s. Without affecting the normal operation of the permanent magnet variable frequency air compressor, by increasing the blowdown time of the separator, the running time of the permanent magnet variable frequency air compressor is effectively extended to meet the minimum running time requirements of the air compressor. After trial operation, the permanent magnet variable frequency air compressor starts to pressurize automatically. Stop at 4.15~4.40MPa, and the running time is more than 11min.
2. Replace the pipeline check valve and install an oil-water separator:
Aiming at the lubricating oil water inflow problem of the air compressor, technicians replaced the pipeline check valve with excellent sealing, and installed an oil-water separator with high water removal efficiency behind the outlet pipeline of the air compressor. The interior of the oil-water separator is filtered by a precision filter element. After the high-temperature compressed air enters the oil-water separator from inlet a, it undergoes cyclone separation, inertial collision separation and ultra-fine fiber filtration to directly intercept the water and oil in the compressed air. The sewage outlet c is discharged, and the compressed air after water removal is discharged through the outlet b to meet the needs of high-pressure gas
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