Causes of permanent magnet variable frequency air compressor faults and treatment methods

As a mature production technology and equipment, 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. Do you know the fault and treatment caused by the water in the 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 small operating time to prevent the formation of condensate, because the condensate will cause the cylinder valve plate and frame parts to rust. The accumulation of condensate in the crankcase may cause an error in the oil level reading.

Water and oil cannot be mixed, and their coexistence will cause the oil to deteriorate quickly. The operating time is usually not less than 10 minutes, which should be enough to heat the air compressor to vaporize and condense moisture. At present, the operating time of the air compressor is 7 minutes, which obviously does not meet the requirements.

2. Severely exceed the water content of the exhaust gas of the permanent magnet variable frequency air compressor

Due to the long standby time of the permanent magnet variable frequency air compressor, the moisture generated by the exhaust gas gathers around the pipe and the check valve, causing the moisture to flow back into the casing, and the moisture content also increases. The lubricating oil gradually increased, resulting in permanent magnet variable frequency air compressor oil.

Bit alarms and downtime. When the outlet pipe of the air compressor was taken out during the shutdown period, the milky white liquid in the pipe was found to flow out, which indicates that the moisture content of the exhaust gas of the permanent magnet variable frequency air compressor is seriously exceeding the standard.

Third, the gas-water separator cannot well separate the water generated during the compression process

The outlet pipe of the permanent magnet variable frequency air compressor is provided with a check valve. The high temperature and high pressure humid air is discharged through the air compressor exhaust valve, after the cooler still contains a certain amount of oil and water, although the permanent magnet frequency conversion is empty.

The two-stage and three-stage inter-stage cooler and the final stage cooler of the compressor are equipped with a gas-water separator to separate the moisture generated during the compression process, but the actual operation effect is not satisfactory.

Four, automatic sewage solenoid valve

There is an automatic drain solenoid valve at the bottom of the oil-water separator, the automatic drain interval is set to 2 min, and the drain time is set to 5 s. Without affecting the normal operation of the permanent magnet variable frequency air compressor, the sewage discharge time of the separator is increased.

It can effectively extend the operating time of the permanent magnet variable frequency air compressor and meet the operating time requirements of the air compressor. After the test run, the permanent magnet variable frequency air compressor will be pressed from the automatic start. 4.15~4.40MPa stop, running time is above 11min.

5. Replace the pipeline check valve and install the oil-water separator

In order to deal with the problem of water entering the air compressor, technicians replaced the well-sealed pipeline check valve and installed a water-water separator with high water removal efficiency after the air compressor outlet pipeline. The inside of the oil-water separator is filtered through a precision filter.

After the high-temperature compressed air enters the oil-water separator from the inlet a, it is directly intercepted by cyclone separation, inertial collision separation and fine fiber filtration, directly intercepting the water and oil in the compressed air. The sewage is discharged from the outlet c, and the compressed air after the water is discharged is discharged through the outlet b to meet the needs of high-pressure gas.