Reasons for high exhaust temperature of air compressor

during the use of air compressors, high exhaust temperature is one of the most common problems. Many people often ignore this problem and eventually cause major accidents. Therefore, I will share the causes of air compressor fever with you to help you quickly troubleshoot and produce safely and efficiently.

The reasons for the high exhaust temperature of the air compressor are as follows:

the oil level is low and the amount of oil is insufficient; the lubricating oil deteriorates; the cooling fan fails to work; the temperature control valve fails or is stuck; the oil filter element is blocked and the oil supply is reduced; the oil cut-off valve fails and is closed, and the main engine is short of oil; The heat dissipation effect is not good, the ambient temperature is> 40, and the heat dissipation is poor. Case 1: The customer's air-cooled air compressor has been put into use for one year. One day, the exhaust temperature is very high. When the temperature is high, the oil and gas temperature reaches the alarm value of 98 ℃, and when it is serious, it reaches the mediation value of 102 ℃. The analysis shows that the space of the mine air compressor room is limited and the heat dissipation is less. Therefore, the door of the machine room is opened to increase the air circulation. The situation is slightly improved, but the alarm still occurs.

At this time, we analyzed the oil and gas separator filter element has been used for about a year, increasing the resistance to oil and gas separation. Therefore, we replaced the filter element and oil filter of the oil and gas separator. The oil and gas temperature during startup is lower than the alarm value, and the fault is removed.

Case 2: The customer's water-cooled air compressor also displayed an oil and gas high temperature alarm during operation. After the inspection, the temperature of the water entering and leaving the cooler has not changed much, so it is suspected that there is a problem with the temperature control valve. When the temperature is high, the temperature control valve will not open, so the oil cannot be cooled well.

Analysis: The water-cooled compressor is equipped with a temperature control valve at the oil inlet of the cooler. Its function is to control the flow of lubricating oil through the cooler to ensure that the oil and gas temperature of the air engine is higher than the pressure dew point temperature when the air engine is running under load, because the lower fuel injection temperature will make the main engine oil temperature too low, and the condensate will precipitate To the oil separator, it is not easy to be taken away by gas. When the oil and gas temperature is lower than 71 ℃, the temperature control valve will not open, and the lubricating oil will directly enter the oil cut-off valve, thereby bypassing the cooler to supply oil to the host. When the oil and gas temperature rises to 75 ℃, the passage to the oil cooler gradually opens. Some oil enters the oil cut-off valve through the cooler, the bypass port is closed, and all the lubricating oil flows to the oil cooler for oil cooling circulation. At this time, we removed the temperature control valve and found that the valve plate of the temperature control valve was not opened, and then poured boiling water at about 75°C on the valve plate. After seeing that the valve plate is opened, stop pouring water and the valve plate closes slowly, indicating that there is no problem with the temperature control valve. After careful inspection, it was found that the oil level was at the highest oil level when the machine was stopped, but when running, the oil level dropped below the lowest oil level. Therefore, add oil to the air compressor, the oil level is between the two red lines, the exhaust temperature at startup is 85 ℃, which is far lower than the alarm temperature of 98 ℃, and the fault is relieved. When the air compressor high temperature alarm, as long as we follow the above 7 common reasons, one by one investigation, the fault will soon be eliminated.