What are the reasons for the high temperature failure of the screw air compressor?

Update:24-05-2022

Summary:1. The Air compressors system is short of oil. Check the oil level of the oil and gas drum through the oil mirror. After the shutdown and pressure rel...

1. The Air compressors system is short of oil. Check the oil level of the oil and gas drum through the oil mirror. After the shutdown and pressure relief, when the lubricating oil is static, the oil level should be slightly higher than the high oil level mark. During the operation of the equipment, the oil level cannot be lower than the low oil level mark. If you find that the amount of oil is insufficient, stop immediately to refuel.

2. The oil filter is faulty. If the oil filter is blocked, the bypass valve cannot be opened, which will cause the air compressor oil to fail to reach the machine head, and the main engine will heat up rapidly due to lack of oil. The blockage of the oil filter causes the flow to become smaller, and the air compressor is not completely taken away because of the heat, so the temperature slowly rises to form a high temperature; after the air compressor is unloaded, the air compressor is high temperature, because the internal oil pressure of the air compressor is high when it is loaded, The air compressor oil can pass through, but after the air compressor is unloaded, the air compressor oil pressure is low, and it is difficult for the air compressor oil to pass through the air compressor oil filter, and the flow rate is too small, resulting in high temperature of the air compressor.

3. Blockage of the oil and gas separator. The blockage of the oil and gas separator will cause the internal pressure to rise. If the pressure is too high, it will cause many problems. High is one of them.

Fourth, the air filter is blocked. The blockage of the air filter will cause the air compressor to be overloaded, and it will be in a loaded state for a long time, causing high temperature. Generally, the first problem caused by the blockage of the air filter is the reduction of air production, followed by the high temperature performance.

Fifth, the oil problem, the selected lubricating oil is of poor quality and is not used in accordance with the specifications. If the lubricating oil exceeds the service time, the oil will deteriorate; the fluidity of the lubricating oil will deteriorate, and the heat exchange performance will decrease, resulting in that the heat of the air compressor head cannot be completely taken away, resulting in the high temperature of the air compressor.

6. If the oil cooler is faulty, check whether the difference between the inlet and outlet oil temperature is about 10 °C. If it is less than this value, check whether the surface of the radiator is blocked. If it is dirty, clean the surface dust with clean compressed air. If the internal pipe is blocked, it can be cleaned with special liquid.

7. The oil shut-off valve fails. The oil shut-off valve of the air compressor is generally a two-position solenoid valve that is normally closed. It is opened when the machine is started and closed when it is stopped, so as to prevent the oil in the oil and gas barrel from continuing to be sprayed into the machine head when the machine is shut down, and from the inlet. Air blows out. If the element is not turned on when loaded, the main engine will heat up rapidly due to lack of oil, and in severe cases, the screw assembly will be burned.

8. The temperature control valve fails. The temperature control valve is installed in front of the oil cooler, and its function is to maintain the exhaust temperature of the machine head above the pressure dew point. If the temperature control valve fails, the lubricating oil may directly enter the machine head without passing through the cooler, so that the oil temperature cannot be lowered, resulting in over-temperature.

Nine, the head problem, the bearing of the screw air compressor head is generally required to be replaced at 20000h, because the clearance and balance of the air compressor are all positioned by the bearing, if the wear of the bearing increases, it will cause the air compressor The heat production of the machine head increases, resulting in high temperature of the air compressor.

10. Whether the pressure is too high, the pressure of the air compressor system is generally adjusted before leaving the factory. If adjustment is required, the rated pressure marked on the nameplate shall prevail. If the adjustment is too high, the over-temperature phenomenon will be caused due to the increase in the load of the unit.

11. The cooling fan is faulty, there is a problem with the cooling fan of the air compressor, the fan does not rotate, the fan is in reverse phase, only one of the two fans is turned on, etc.
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