With the development of science and technology, air compressor as an important power equipment, is widely used in machinery, metallurgy, building materials, electronic power, chemical industry, food, textile and many other industrial fields.

However, in the long-term operation of the compressor, it is bound to encounter many failures, and frequent loading and unloading is one of them. Frequent actions not only shorten the life of the unit solenoid valve, compressor inlet valve and unloading valve, but also seriously threaten the safe operation of the whole unit.

Cause of failure

What are the reasons for the frequent loading and unloading of the compressor?

1) Reasons for control

As we all know, the discharge pressure of the compressor is the main basis for controlling the loading and unloading of the compressor. If the difference between the two set values becomes smaller, it may cause frequent loading and unloading of the unit. When the loading pressure value of the unit increases, the unloading pressure value decreases at the same time. Or simply the increase of the loading pressure value and the decrease of the unloading pressure value will shorten the loading and unloading cycle of the unit, that is, under the condition of constant gas consumption, the closer the loading and unloading pressure values are, the more frequent the loading and unloading are, and the greater the hidden danger of safe operation of the equipment.

2) System reasons

If the set value of the loading and unloading pressure of the unit is normal, it can be considered whether there is pipeline blockage between the compressor outlet and the air storage tank. If the pipeline is blocked but not completely cut off, the compressed air circulation will be seriously blocked, and the gas pressure between the blockage point and the compressor is difficult to quickly unload during the loading of the compressor, resulting in a very short time to reach the unloading pressure value and unloading. However, due to the limited air volume between the blockage point and the compressor outlet, coupled with system losses (such as filter drainage with air, regeneration of cold dryer) and a small part of circulation to the air storage tank, the pressure quickly drops to the loading pressure value, and the compressor is reloaded again, so repeatedly.