Analysis and Treatment of Lubricant Water Ingress Fault of Permanent Magnet Variable

Analysis and Treatment of Lubricant Water Ingress Fault of Permanent Magnet Variable

Frequency Air Compressor

Analysis of Lubricant Water Inflow Fault of Permanent Magnet Variable Frequency Air Compressor

1. The accumulation of condensed water causes an error in the oil level reading

According to the operating requirements of the permanent magnet variable frequency air compressor, the air compressor should have a minimum operating time to prevent the formation of condensate, because the condensed water will cause the rust of the cylinder valve plate and frame components. The accumulation of condensate in the crankcase may cause false oil level readings. Water and oil cannot be mixed, and their coexistence causes the oil to deteriorate rapidly. The minimum operating time is generally not less than 10 minutes, which should be sufficient to heat the air compressor to vaporize and condense moisture. At present, the running time of the air compressor is 7 minutes, which obviously does not meet the requirements.

2. The exhaust water content of the permanent magnet variable frequency air compressor seriously exceeds the standard

Due to the long standby time of the permanent magnet variable frequency air compressor, the moisture generated by the exhaust gas gathers around the pipeline and the check valve, which causes the moisture to flow back into the chassis, and the water content of the lubricating oil gradually increases, which eventually leads to the permanent magnet variable frequency air compressor oil Bit alarm and fault shutdown. When the outlet pipe of the air compressor was shut down, it was found that there was a large amount of milky white liquid flowing out of the pipe, which indicated that the exhaust water content of the permanent magnet variable frequency air compressor was seriously exceeding the standard.

3. The gas-water separator cannot well separate the water generated during the compression process

The outlet pipeline of the permanent magnet variable frequency air compressor is equipped with a check valve. The humid air of high temperature and high pressure is discharged through the air compressor exhaust valve. After passing through the post cooler, certain oil and water components are still entrained. The second and third stage inter-stage coolers and the final stage cooler of the compressor are equipped with gas-water separators to separate the moisture generated during the compression process, but the actual operation effect is not ideal.

Treatment method for lubricating oil inflow of permanent magnet variable frequency air compressor

1. Automatic sewage solenoid valve:

2. There is an automatic drain solenoid valve at the bottom of the oil-water separator, and the automatic drain interval time is set to 2min, and the drain time is set to 5s. Without affecting the normal operation of the permanent magnet variable frequency air compressor, by increasing the drain time of the separator, the operating time of the permanent magnet variable frequency air compressor is effectively extended to meet the minimum operating time requirements of the air compressor. After trial operation, the permanent magnet variable frequency air compressor automatically starts to suppress. 4.15~4.40 MPa shutdown, the running time is more than 11 min.

3. 2. Replace the pipeline check valve and install an oil-water separator:

4. Aiming at the problem of lubricating oil in the air compressor, the technicians replaced the well-sealed pipeline check valve, and installed an oil-water separator with high water removal efficiency after the outlet pipeline of the air compressor. The inside of the oil-water separator uses precision

5. Filter element filtration. After high temperature compressed air enters the oil-water separator from inlet a, it is separated by cyclone, inertial collision separation and fine fiber filtration to directly intercept the water and oil in the compressed air, and discharge it through the sewage outlet c to remove water. The latter compressed air is discharged through outlet b to meet the needs of high-pressure air.

6. As an advanced and mature clean production technology and equipment, permanent magnet variable frequency air compressors are widely used in many fields such as steel, petroleum, electrical appliances, feed, pharmaceutical manufacturing, chemicals, power plants, printing, and food. Compared with the first-generation piston air compressor and the second-generation screw air compressor, the permanent magnet variable frequency air compressor has zero transmission loss, 100% efficiency, and is more energy-saving and power-saving!