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In summer, did you cool down your air compressor?
Classification: Technical Support
Classification: News dynamics
Time：2018-05-25 10:37
1. Excessive ambient temperature affects the screw air compressor in the following two aspects: A: The higher the temperature, the thinner the air (just like the air compressor has low efficiency in plateau areas), resulting in a decrease in the working efficiency of the air compressor, making the air compressor stay in a loading state for more time and bring more load, resulting in more heat generated by the air compressor, and the air compressor must have a higher temperature. B: Generally, there is a design operating environment temperature (30-40 degrees) when designing an air compressor. Generally, the highest temperature of the air compressor running under the design operating environment temperature is close to the protection temperature of the air compressor. If the ambient temperature of the air compressor is higher than the design operating environment
1, the ambient temperature is too high on the screw air compressor caused by the following two aspects
A: The higher the temperature, the thinner the air (just like the low efficiency of the air compressor in the plateau area), resulting in a decrease in the working efficiency of the air compressor, making the air compressor more time in the loading state, with more load, resulting in more heat generated by the air compressor, and the air compressor must have a higher temperature.
B: Generally, there is a design operating environment temperature (30-40 degrees) when designing an air compressor. Generally, the highest temperature of the air compressor running under the design operating environment temperature is close to the protection temperature of the air compressor. If the ambient temperature of the air compressor is higher than the design operating environment temperature, the temperature of the air compressor will be increased so that the air compressor can even exceed the shutdown temperature of the air compressor, thus causing the air compressor to have a high temperature.
2. The air compressor system is short of oil
Check the oil level of the oil and gas barrel. 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 H (or MAX). During the operation of the equipment, the oil level cannot be lower than the low oil level mark L (or MIX). If the oil is found to be insufficient or the oil level is not observed, stop the machine immediately for refueling.
3. The oil stop valve (oil cut-off valve) does not work properly
The oil stop valve is generally a two-position two-normally closed solenoid valve, which is opened when starting and closed when stopping, so as to avoid the oil in the oil and gas barrel from continuing to spray into the machine head and from the air inlet. If the component is not opened when loading, the main engine will heat up rapidly due to lack of oil, which will cause the screw assembly to burn down in serious cases.
4. Oil filter problem
A: If the oil filter is blocked and the bypass valve is not opened, the air compressor oil cannot reach the head, and the main engine will heat up rapidly due to lack of oil.
B: The clogging flow rate of the oil filter becomes smaller. One situation is that the air compressor slowly rises to a high temperature because the heat is not completely taken away. The other situation is that the air compressor has a high temperature after the air compressor is unloaded, because the internal oil pressure of the air compressor is high when the air compressor is loaded, and the air compressor oil pressure is low after the air compressor is unloaded. It is difficult for the air compressor oil to pass through the air compressor oil filter, and the flow rate is too small.
5, thermal control valve (temperature control valve) work failure
The thermal control valve is installed in front of the oil cooler, and its function is to maintain the exhaust temperature of the nose above the pressure dew point. The working principle is that when the oil temperature is low, the branch of the thermal control valve is opened, the main circuit is closed, and the lubricating oil is directly sprayed into the machine head without passing through the cooler; when the temperature rises above 40 ℃, the thermal control valve is gradually closed, and the oil flows through the cooler and the branch at the same time; when the temperature rises above 80 ℃, the valve is completely closed, and the lubricating oil enters the machine head through the cooler to cool to the maximum.
If the thermal control valve fails, the lubricating oil may enter the machine head directly without the cooler, so that the oil temperature cannot drop, resulting in overtemperature. The main reasons for its failure, one is the size of the valve core two thermal spring fatigue after the elastic coefficient changes, can not change with the temperature and normal action; two is the valve body wear, valve core stuck or action is not in place and can not be closed normally. Can be repaired or replaced according to the situation.
6, check the oil regulator is normal, if necessary, can be appropriate to increase the amount of fuel injection
The amount of fuel injection has been adjusted when the equipment leaves the factory and should not be changed under normal circumstances.
7. The oil exceeds the use time and the oil deteriorates
The fluidity of the oil becomes poor, and the heat exchange performance decreases. The heat of the air compressor head cannot be completely taken away, resulting in high temperature of the air compressor.
8. Check whether the oil cooler works normally
For water-cooled models, the temperature difference between the inlet and outlet water pipes can be checked. Under normal circumstances, it should be 5-8 ℃, and there may be scaling or blockage below 5 ℃, which will affect the heat exchange efficiency of the cooler and cause Poor heat dissipation, at this time, the heat exchanger can be removed for cleaning.
9. Check whether the inlet temperature of cooling water is too high, whether the water pressure and flow rate are normal, and whether the ambient temperature is too high for air-cooled models.
The inlet temperature of cooling water should generally not exceed 35 ℃, the water pressure should be between 0.3 and 0.5MPA, and the flow rate should not be less than 90% of the specified flow rate. The ambient temperature should not be higher than 40 ℃. If the above requirements are not met, it can be solved by installing cooling towers, improving indoor ventilation, and increasing room space. You can also check that the cooling fan is working properly. If there is any fault, it should be repaired or replaced.
10. The air-cooled unit mainly checks whether the difference between the inlet and outlet oil temperatures is about 10 degrees. If it is less than this value, check whether the fins on the radiator surface are dirty and blocked. If the dirty and blocked, clean air can be used to blow clean the dust on the radiator surface and check whether the radiator fins are corroded. If the corrosion is severe, it is necessary to consider replacing the radiator assembly and whether the internal pipelines are dirty and blocked, be sure to pay attention to the concentration of the liquid medicine and the cycle time to avoid the radiator from penetrating the cavity due to the corrosion of the liquid medicine.
11. The problem with the fan of the air cooler is that the fan does not rotate, the fan is reversed, and only one of the two fans is turned on, etc.
12. Problems with exhaust pipes installed by customers of air-cooled models
There are exhaust ducts with too small air surface, too long exhaust ducts, too many corners in the middle of the exhaust ducts, too long exhaust ducts, and many corners in the middle of the exhaust ducts. There are no exhaust fans installed, and the flow rate of the exhaust fans is less than that of the original cooling fan of the air compressor.
13. The temperature sensor reading is not allowed
14. The computer reading is not allowed

15. Head problem
Generally, the air compressor head bearing requires replacement in 20000-24000 hours, because the clearance and balance of the air compressor are guaranteed by the bearing. If the wear of the bearing increases, the heat production of the air compressor head will increase, resulting in high temperature of the air compressor.
16. Incorrect lubricating oil specifications or poor quality
The lubricating oil of the screw machine has strict requirements and cannot be substituted at will. It should be based on the requirements in the equipment instruction manual.
17. Check whether the air filter is blocked
Air filter clogging will cause the air compressor load is too large, long-term loading state, will cause high temperature. It can be checked or replaced according to the alarm signal of the differential pressure switch. General air filter blockage caused by the first problem is the reduction of gas production, air compressor high temperature is a secondary performance.
18. Check whether the pressure is too high
The system pressure is generally set at the factory, if it is necessary to adjust, the rated gas production pressure calibrated on the equipment nameplate shall prevail. If the adjustment is too high, the overtemperature phenomenon will be caused by the increase of the load of the machine. This is also the same as the previous reason. The high temperature of the air compressor is a secondary manifestation, mainly manifested by the increase of the current of the air compressor motor and the shutdown of the air compressor protection.
19. Oil and gas separator is blocked
The blockage of the oil and gas separator will cause the internal pressure to be too high, and the high pressure will cause many problems, and high temperature is one of them. This is also the same as the first two reasons, the oil and gas separator blockage is mainly manifested as high internal pressure.