How to use the hottest screw air compressor

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How to use screw air compressor

overview of screw air compressor the screw air compressor in this section is an oil injected single-stage twin-screw compressor, which is driven by high-efficiency pulley (or shaft) to drive the main engine to rotate for air compression. The main engine compression chamber is cooled and lubricated by oil injection. The air and oil mixed gas discharged from the compression chamber are separated through coarse and fine separation to separate the oil in the compressed air, and finally get clean compressed air

twin screw air compressor has excellent reliable performance. Its greatest advantages are light weight, small vibration, low noise, convenient operation, few vulnerable parts and high operation efficiency

working principle of compressor host the core component of the screw air compressor in this section is the compressor host, which is one of the positive displacement compressors. The air compression is achieved by the change of the volume of the slots of the male and female rotors installed in the casing and meshed with each other in parallel. The rotor pair rotates in the precisely matched casing, so that the gas between the rotor slots continuously produces periodic volume changes, and along the rotor axis, it is pushed from the suction side to the discharge side, completing the three working processes of suction, compression and exhaust. Therefore, the profile technology of twin-screw rotor determines the product positioning grade of screw air compressor. (for the profile technology of shenxingjian, please refer to the column "core technology of twin screw air compressor" on the home page)

work flow of twin-screw air compressor after the dust or impurities in the air are filtered out through the air inlet filter based on the component analysis of the unique additives of engineering materials, the air enters the compressor host through the air inlet control valve, and is mixed with the injected cooling lubricating oil during the compression process. The compressed mixed gas is discharged into the oil-gas separation tank from the compression chamber. At this time, the compressed oil-bearing gas is discharged through collision, interception and gravity, Most of the oil medium is separated, and then enters the oil-gas fine separator for secondary separation to obtain compressed air with little oil content. When the air is compressed to the specified pressure value, the minimum pressure valve is opened, and the compressed air is discharged to the cooler for cooling, and finally sent to the service system

use and maintenance of screw air compressor

safety precautions

1 The operation, repair and maintenance of the compressor must be carried out by qualified personnel

2. The compressor cannot be reversed. After the initial startup or maintenance of the electric control system, it is necessary to first confirm whether the rotation direction of the motor is consistent with the specified rotation direction before starting the compressor

3. Disassembly of high-temperature components must be carried out after the temperature is cooled to the ambient temperature

4. Special oil for screw compressor is recommended. Lubricating oils of different brands are not allowed to be mixed

5. Without the permission of the manufacturer, do not make any changes to the compressor that affect the safety and reliability or add any devices

6. The original compressor spare parts are specially designed and manufactured. It is recommended to use authentic spare parts to ensure the reliability and safety of the compressor

7 It is absolutely not allowed to block the suction port of the compressor during operation

8. Compressed air shall not be used for breathing unless it has been indicated that it can be used for breathing

9. Do not operate the compressor above the specified pressure and temperature

10. In case of abnormal operation of the compressor, stop the compressor immediately and eliminate the abnormality in time

11. Maintain and repair the compressor with correct tools

12. After maintenance and before startup, confirm that all safety devices have been reinstalled and tools have been removed from the compressor


1 Check the oil level, exhaust temperature and exhaust pressure every day, and check whether there is any abnormal sound

2. Open the drain valve of separator to drain condensate before startup every week, check whether there is leakage everywhere, check the safety valve, and check the belt wear (visual inspection)

3. Regularly check the air inlet control valve, minimum pressure valve, electric cabinet connecting line terminal, safety valve and cooling fan

4. Regularly clean and clean the cooler and test the reliability of the safety valve

5. Regularly replace the oil filter element, oil separator filter element, air inlet filter element and lubricating oil

common troubleshooting

1 The machine does not start: check the main switch and power line, and check the motor

2. The machine does not load after startup: adjust the setting value of the pressure switch or replace the pressure switch, check or replace the solenoid valve

3. The compressor does not unload and the safety valve discharges: adjust the setting value of the pressure switch or replace the pressure switch, check or replace the solenoid valve

4. Excessive oil consumption: use oil as recommended, lower the oil level to the normal position, remove the oil return pipeline for cleaning, and replace the filter element of the oil-gas separator

5. The exhaust pressure is lower than the specified value: reduce the air consumption or increase the compressor, check the system leakage, clean or replace the air inlet filter core, replace the filter element of the oil-gas separator, check or replace the solenoid valve, repair the air inlet control valve, replace the belt, and adjust the setting value of the pressure switch

6. Compressor high temperature protection shutdown: improve environmental ventilation conditions, clean or clean the cooler, add oil to the specified position, and replace the oil filter

7. When the compressor operates under unloading, the exhaust pressure still rises slowly, and the safety valve discharges: check or replace the solenoid valve, overhaul the air inlet control valve, and overhaul the unloading pipeline

8. Relief of safety valve: overhaul or replace the safety valve, overhaul the minimum pressure valve, replace the filter element of oil-gas separator, overhaul or replace the pressure switch, and check the air inlet control valve or solenoid valve

maintenance of air inlet filter element

the air filter is a component that filters out air dust and dirt outside the center of the jaw. The filtered clean air enters the screw rotor compression chamber for compression. Because the internal clearance of the screw machine only allows particles within 15u to be filtered out. If the air filter element is blocked and damaged, a large number of particles larger than 15u will enter the screw machine for circulation, which will not only greatly shorten the service life of the oil filter element and oil fine separation core, but also cause a large number of particles to directly enter the bearing cavity, accelerate the bearing wear, increase the rotor clearance, reduce the compression efficiency, and even make the rotor dry and bite

replacement of engine oil filter

the engine oil core shall be replaced after the first 500 hours of operation of the new machine, and the oil filter element shall be removed with a special wrench. Before installing the new filter element, it is better to add screw oil. The filter element seal shall be screwed back to the oil filter base with both hands and tightened firmly. It is recommended to replace the filter element every hour. It is better to replace the oil filter element at the same time when changing the engine oil. The replacement cycle should be shortened when using in a bad environment. It is strictly forbidden to use the engine oil filter element beyond the time limit. Otherwise, because the filter element is seriously blocked and the pressure difference exceeds the bearing limit of the bypass valve, the bypass valve will automatically open, and a large amount of dirt and particles will directly enter the screw host with the engine oil, causing serious consequences. The diesel engine oil filter element and diesel filter element of diesel screw engine shall be replaced in accordance with the diesel engine maintenance requirements, and the replacement method is similar to the screw oil core

maintenance and replacement of fine oil separator

fine oil separator is a component that separates screw lubricating oil and compressed air. Under normal operation, the service life of fine oil separator is about 3000 hours, but the quality of lubricating oil and the filtering accuracy of air have a great impact on its service life. It can be seen that the maintenance and replacement cycle of the air filter element must be shortened under the harsh service environment, and even the installation of the front air filter should be considered. The oil fine separator must be replaced when it expires or the pressure difference between the front and back exceeds 0.12mpa. Otherwise, the motor will be overloaded, and the oil fine separator will be damaged and run out of oil. Replacement method: remove all control pipe joints installed on the oil and gas barrel cover. Take out the oil return pipe protruding into the oil and gas barrel on the oil and gas barrel cover, and remove the fastening bolts on the upper cover of the oil and gas barrel. Remove the upper cover of the oil and gas barrel and take out the oil fine. Remove the asbestos pad and dirt stuck on the upper cover plate. Install a new oil fine separator. Note that the upper and lower asbestos mats must be stapled. The asbestos mats must be placed neatly during compaction, otherwise it will cause scouring. Install the upper cover plate, oil return pipe and all control pipes as they are, and check for leakage

maintenance and replacement

the quality of screw oil has a decisive impact on the performance of oil injection screw machines. Good oil products have good antioxidant stability, rapid separation, good foaming property, high viscosity and good corrosion resistance. Therefore, users must use pure screw oil specially used by the company. The oil shall be replaced for the first time after the running in period of the new machine is 500 hours, and then it shall be replaced every 2000 hours of operation. It is better to change the oil filter at the same time when changing the oil. Use in harsh environment to shorten the replacement cycle. Replacement method: start the air compressor and run it for 5 minutes, so that the oil temperature rises to more than 50 ℃, and the oil viscosity decreases. Stop the operation. When there is 0.1MPa pressure in the oil and gas drum, open the oil drain valve at the bottom of the oil and gas drum and connect the oil storage tank. The oil drain valve shall be opened slowly to avoid personal dirt caused by splashing of lubricating oil with pressure and temperature. Close the oil drain valve after the lubricating oil drops. Unscrew the oil filter element, drain all the lubricating oil in each pipeline at the same time, and replace it with a new oil filter element. Open the oil filler plug, inject new oil so that the oil level is within the range of the oil scale mark, tighten the oil filler plug and check for leakage. The lubricating oil must be checked frequently during use. If it is found that the oil level line is too low, new oil should be added in time. Condensate must also be discharged frequently during use. According to statistics, it is generally discharged once a week and once a day in high temperature climate. Shut down the machine for more than 4 hours, open the oil valve when there is no pressure in the oil and gas drum, drain the condensate, and quickly close the valve when you see the oil flowing out. It is strictly forbidden to mix different brands of lubricating oil. It is forbidden to use lubricating oil beyond the time limit. Otherwise, the quality of lubricating oil will decline, the lubricity will be poor, and the flash point will be reduced, which will easily cause high-temperature shutdown and spontaneous combustion of oil products

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