Use of screw air compressor?

Screw air compressor is a single-stage twin-screw compressor with oil injection. The high-efficiency pulley (or shaft device) drives the main engine to rotate for air compression. The compression chamber of the main engine is cooled and lubricated by oil injection. The mixed gas of air and oil discharged from the compression chamber is separated by coarse separation and fine separation, and the oil in compressed air is separated, and finally clean compressed air is obtained. Twin-screw air compressor has excellent reliability, and its biggest advantages are light weight, small vibration, low noise, convenient operation, few wearing parts and high operation efficiency.

Working principle of compressor main engine

The core component of screw air compressor is the main compressor, which is a kind of positive displacement compressor. Air compression is realized by the volume change of the tooth grooves of the male and female rotors installed in the casing and engaged in parallel with each other. The rotor pair rotates in the casing which is closely matched with it, so that the gas between the rotor cogging constantly produces periodic volume changes and is pushed from the suction side to the exhaust side along the rotor axis, completing the three working processes of suction, compression and exhaust. Therefore, the profile technology of twin-screw rotor determines the product positioning level of screw air compressor. For Shen Xingjian's profile technology, please refer to the column of "Core Technology of Twin-screw Air Compressor" on the homepage.

Working flow of twin-screw air compressor

After the air is filtered by the air inlet filter to remove dust or impurities in the atmosphere, it enters the compressor main engine through the air inlet control valve and is mixed with the injected cooling lubricating oil during compression. The compressed mixed gas is discharged from the compression chamber into the oil-gas separation tank. At this time, most of the oil-bearing gas discharged by compression is separated by collision, interception and gravity, and then enters the oil-gas fine separator for secondary separation, and compressed air with little oil content is obtained. When air is compressed to a certain pressure value,

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 overhaul of the electronic control system, it is necessary to confirm whether the rotation direction of the motor is consistent with the specified rotation direction before starting the compressor. 3. Only after the temperature has cooled to the ambient temperature can the high-temperature components be removed. 4. It is recommended to use special oil for screw compressor. Different brands of lubricants are not allowed to be mixed. 5. Without the permission of the manufacturer, do not make any changes to the compressor or add any devices that affect the safety and reliability. 6. The original spare parts of the compressor are specially designed and manufactured. It is recommended to use genuine spare parts to ensure the reliability and safety of the compressor. 7. It is absolutely not allowed to block the compressor suction port during operation. 8. Compressed air is absolutely not allowed to be used for breathing unless it has been indicated that it can be used for breathing. 9. Don't run the compressor under the condition of exceeding the specified pressure and temperature. 10. Once the compressor is found abnormal, stop it immediately and eliminate the abnormality in time. 1 1. Use the correct tools to maintain and repair the compressor. 12. Ensure that all safety devices have been reinstalled and tools have been removed from the compressor after maintenance and before startup.

Maintain 1. Check the oil level, exhaust temperature and exhaust pressure every day, and check whether there is any abnormal sound; 2. Before starting the machine every week, open the drain valve of the separator to discharge condensed water, check whether there is any leakage everywhere, check the safety valve and check the belt wear (visual inspection); 3. Regularly check the intake control valve, minimum pressure valve, electrical cabinet terminal, safety valve and cooling fan; 4. Regularly clean and clean the cooler to test the reliability of the safety valve; 5. Replace the oil filter, oil separator filter, air inlet filter and lubricating oil regularly.

Common troubleshooting 1. Machine does not start: check the main switch and power cord, and check the motor; 2. No load after startup: adjust the set value of the pressure switch or replace the pressure switch, and check or replace the solenoid valve; 3. The compressor is not unloaded, and the safety valve is released: adjust the set value of the pressure switch or replace the pressure switch, and check or replace the solenoid valve; 4. Excessive oil consumption: use the recommended oil, 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. Exhaust pressure is lower than the specified value: reduce gas consumption or increase compressor, check system leakage, clean or replace intake filter element, replace oil-gas separator filter element, check or replace solenoid valve, overhaul intake control valve, replace belt, and adjust pressure switch setting value; 6. Compressor shutdown under high temperature protection: improve the ambient ventilation conditions, clean or clean the cooler, refuel at the specified position, and replace the oil filter; 7. When the compressor is unloaded, the exhaust pressure is still rising slowly, and the safety valve is released: check or replace the solenoid valve, overhaul the intake control valve, and overhaul the unloading pipeline; 8. Safety valve: overhaul or replace the safety valve, overhaul the minimum pressure valve, replace the filter element of the oil-gas separator, overhaul or replace the pressure switch, and check the intake control valve or solenoid valve.

Maintenance of air inlet filter element The air filter is a component that filters out air dust and dirt, and the filtered clean air enters the compression cavity of the screw rotor for compression. Because the internal clearance of the screw machine only allows particles within 15u to be filtered out. If the empty filter element is blocked and damaged, a large number of particles larger than 15u will circulate in the screw machine, which will not only greatly shorten the service life of the oil filter element and the oil fine separation core, but also cause a large number of particles to directly enter the bearing cavity, accelerate bearing wear, increase rotor clearance, reduce compression efficiency and even make the rotor die. Replacement of oil filter After the new machine runs for 500 hours for the first time, the oil filter should be replaced, and the oil filter should be removed by reverse rotation with a special wrench. Before installing a new filter element, it is best to add screw oil, screw the oil return filter seat with both hands, seal the filter element and tighten it hard. It is recommended to replace the new filter every 1500-2000 hours. It is best to replace the oil filter element at the same time when changing the oil, and the replacement cycle should be shortened when it is used in harsh environment. It is forbidden to use the oil filter beyond the time limit. Otherwise, due to the serious blockage of the filter and the pressure difference exceeding the allowable limit of the bypass valve, the bypass valve will automatically open, and a large number of stolen goods and particles will directly and randomly enter the screw main engine, causing serious consequences. The replacement of diesel filter and diesel oil filter of diesel engine driven by diesel engine should follow the maintenance requirements of diesel engine, and the replacement method is similar to that of spiral oil filter. Maintenance and replacement of fine oil separator The fine oil separator is a component for separating screw lubricating oil from compressed air. Under normal circumstances, the service life of fine oil separator is about 3000 hours, but the quality of lubricating oil and the filtration accuracy of air have great influence on its service life. It can be seen that in the harsh use environment, the maintenance and replacement cycle of the air filter element must be shortened, and even the front air filter should be considered. When the fine oil separator is out of date or the pressure difference before and after it exceeds 0. 12Mpa, it must be replaced. Otherwise, the motor will be overloaded, the fine oil separator will be damaged and oil will leak. Replacement method: Remove each control pipe joint installed on the oil and gas barrel cover. Take out the oil return pipe that extends into the oil and gas barrel from the oil and gas barrel cover, and remove the fastening bolt of the oil and gas barrel cover. Remove the upper cover of the oil and gas barrel and take out the oil powder. Remove asbestos pad and dirt stuck on the upper cover plate. When installing a new oil separator, pay attention to nail the upper and lower asbestos pads firmly, and put them neatly when pressing, otherwise the pads will be washed. Replace the upper cover plate, oil return pipe and control pipe as they are, and check for leakage. The maintenance and replacement quality of screw oil has a decisive influence on the performance of oil injection screw machine. Good oil products have good anti-oxygen stability, rapid separation, good defoaming performance, high viscosity and good corrosion resistance. Therefore, users must use our company's pure special screw oil. Change the oil for the first time after the running-in period of the new machine is 500 hours, and then change the oil every 2000 hours. It is best 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 to run for 5 minutes, so that the oil temperature rises above 50℃ and the oil viscosity decreases. Stop running. When the pressure in the oil and gas barrel reaches 0. 1Mpa, open the oil drain valve at the bottom of the oil and gas barrel and connect the oil storage tank. The oil drain valve should be opened slowly to prevent the lubricating oil with pressure and temperature from splashing out. After lubricating oil drips, close the oil drain valve. Unscrew the oil filter element, drain 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, make the oil level within the oil scale line, tighten the oil filler plug, and check whether there is any leakage. Lubricating oil must be checked frequently during use. When the oil level is too low, new oil should be replenished in time. In the process of using lubricating oil, condensed water must also be discharged frequently, usually once a week and every 2-3 days in high temperature climate. Stop the machine for more than 4 hours, open the oil valve when there is no pressure in the oil and gas barrel, drain the condensed water completely, and close the valve quickly when there is engine oil flowing out. It is forbidden to mix different brands of lubricating oil, and it is forbidden to use lubricating oil for an extended period. Otherwise, the quality of lubricating oil will be reduced, the lubricity will be poor, and the flash point will be reduced, which will easily lead to high-temperature shutdown and spontaneous combustion of oil products. There are two main points to pay attention to: First, check the diesel engine and air compressor, especially some oil levels and water levels, and check the operating parts (try it manually to ensure smooth operation). Check the wiring of batteries, etc. Start the motor after completion (some machines have preheating devices, which can be preheated first when the temperature is low). After the diesel engine runs normally for a few minutes, start the booster (usually a ball valve or something like that). Look at the pressure gauge. At the same time, the exhaust valve is controlled manually, so that the air compressor can run continuously in the state of empty car and heavy car.

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