1. Too high ambient temperature will affect the screw air compressor in 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, so that the air compressor will be in a loading state for more time, with more load, resulting in air The more heat the compressor produces, the higher the air compressor must be.

B: Generally, when the air compressor is designed, there is a designed operating environment temperature (30-40 degrees). When the air compressor is operated at the designed operating environment temperature, the general maximum temperature is close to the protection temperature of the air compressor. If the air compressor environment If the temperature is higher than the designed operating ambient temperature, the temperature of the air compressor will be increased, so that the air compressor will even exceed the shutdown temperature of the air compressor, resulting in high temperature of the air compressor.

2. The air compressor system is short of oil

You can check the oil level of the oil and gas drum. 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 it is found that the amount of oil is insufficient or the oil level cannot be observed, stop immediately to refuel.

3. The oil stop valve (oil shut-off valve) is not working 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 prevent the oil in the oil and gas barrel from continuing to be sprayed into the machine head and ejected from the air inlet when the machine is stopped. 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.

4. Oil filter problem

A: The oil filter blocks the bypass valve and does not open it, which will cause the air compressor oil to not reach the machine head, and the main engine will heat up rapidly due to lack of oil.

B: The oil filter is blocked and the flow rate becomes smaller. In one case, the air compressor is not completely taken away by the heat. The temperature of the air compressor gradually rises to form a high temperature. Another situation is that the air compressor is high temperature after the air compressor is unloaded. , Because the internal oil pressure of the air compressor is high during loading, 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. Press high temperature.

5. The thermal control valve (temperature control valve) fails to work

The thermal 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. Its working principle is that when the oil temperature is low, the thermal control valve branch is opened, the main circuit is closed, and the lubricating oil is directly injected into the machine head without the cooler; when the temperature rises above 40 °C, the thermal control valve is gradually closed, The oil flows through the cooler and the branch at the same time; when the temperature rises above 80°C, the valve is completely closed, and the lubricating oil enters the machine head through the cooler to cool the lubricating oil to the greatest extent.

If the thermal 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. The main reason for its failure is that the elastic coefficient of the two thermal springs on the spool changes after fatigue, and cannot operate normally with the temperature change; the second is that the valve body is worn, the spool is stuck or the action is not in place and cannot be closed normally. . It can be repaired or replaced according to the situation.

6. Check whether the fuel volume regulator is normal, and if necessary, increase the fuel injection volume appropriately

The amount of fuel injection has been adjusted when the equipment leaves the factory, and it should not be changed under normal circumstances.

7. If the oil exceeds the use time, the oil will deteriorate

The fluidity of the oil becomes poor, and the heat exchange heat 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, you can check the temperature difference between the inlet and outlet water pipes. Under normal circumstances, it should be between 5 and 8 °C. Below 5 °C, there may be scaling or clogging, which will affect the heat exchange efficiency of the cooler and cause heat dissipation. If it is not good, the heat exchanger can be removed and cleaned at this time.

9. Check whether the cooling water inlet temperature is too high, and whether the water pressure and flow rate are normal. For air-cooled models, check whether the ambient temperature is too high.

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 the space of the computer room. 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 surface of the radiator are dirty and blocked. If they are dirty, clean the dust on the surface of the radiator with clean air and check the radiator. Whether the fins are corroded, and if the corrosion is severe, it is necessary to consider replacing the radiator assembly, and whether the internal pipes are dirty and blocked. If this phenomenon occurs, the circulating pump can be used to circulate a certain acid solution for cleaning. Be sure to pay attention to the concentration of the solution and the cycle time. , to prevent the radiator from penetrating the cavity caused by the corrosion of the radiator

11. The fan problem 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 in the exhaust duct installed by customers of air-cooled models

The air passage surface of the exhaust duct is too small, the exhaust duct is too long, there are too many bends in the middle of the exhaust duct, and there are many bends in the middle of the exhaust duct. Is there an exhaust fan installed, and the flow rate of the exhaust fan is smaller than the original cooling fan of the air compressor .

13. The temperature sensor reading is not accurate

14. Inaccurate computer readings



15. Machine head problem

Generally, the head bearing of the air compressor needs to be replaced every 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 generation of the air compressor head will increase. cause high temperature in the air compressor.

16. Incorrect specifications or poor quality of lubricating oil

The lubricating oil of the screw machine has strict requirements and cannot be replaced at will.

17. Check if 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, which will cause high temperature. It can be checked or replaced according to the alarm signal of the differential pressure switch. Generally, the first problem caused by the blockage of the air filter is the reduction of gas production, and the high temperature of the air compressor is a secondary manifestation.

18. Check if 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 marked on the equipment nameplate shall prevail. If the adjustment is too high, the overheating phenomenon will occur due to the increase in 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. The main manifestation is that the current of the air compressor motor increases and the air compressor is shut down for protection.

19. The 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 blockage of the oil and gas separator is mainly manifested by high internal pressure.