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Permanent magnet variable frequency screw air compressor

时间:2021-06-11| 作者:admin

Permanent magnet variable frequency screw air compressor


Air compressor oil often presents problems during the use of air compressors, and its oil often presents problems, so in order to do preventive work early, and outsmart the period-Aineng Air Compressor summarizes the following special needs for you Pay attention to: 1. There are many oil foams: usually the proportion of oil defoamer added is not suitable, sometimes it will lead to a lack of oil return and affect the service life of the machine bearing; 2. The air outlet has a higher oil content: oil The separation of oil and gas is poor, and there are more hydrides in the base oil, which makes it difficult to distinguish it from compressed air; 3. Gum: The base oil of the air compressor oil is not good, and there are many impurities in the gray matter. It is easy to oxidize. After high temperature and air oxidation reaction, it will form tar-like sludge. In severe cases, it will cause the air compressor head to lock up. The common precursor of gelling is that the compressed air becomes odorous and the air compressor operates with high current; 4 , The color of the old oil is abnormal: Under normal circumstances, the color of the oil will become dark red or black, but if the color such as purple is assumed to indicate improper use of oil additives, it is recommended to change the oil in time; 5. Oil emulsification: long-term low temperature for air compressors When the machine is running, the water in the machine cannot be evaporated in time, and the oil and water are mixed and emulsified to form a milk-like liquid; 6. Carbon formation: Under high temperature operation of the air compressor, especially after the temperature exceeds 95 degrees, the light and heavy components of the oil will be separated, and the image will become The lacquer is adsorbed on the surface of the parts, which will block the oil separator, wear out the oil seal of the machine head and leak oil, and shorten the service life of the bearing.


Once the frequency conversion screw air compressor was put into use, it was praised and recommended by many users, and then it was widely used in many fields such as industry. The usual variable frequency screw air compressors are gradually replacing the position of power frequency driven air compressors in various fields, occupying most of the air compressor market. So why can the variable frequency screw air compressor replace the power frequency drive air compressor? Next, we will look at the reason why the variable frequency screw air compressor replaces the power frequency drive air compressor. 1. The variable frequency screw air compressor starts without impact. The frequency converter in the variable frequency screw air compressor has a soft start function, so its starting current is only 0.2 times higher than the rated current, but the power frequency driven air compressor is starting When the current can reach 6 times the rated current, resulting in more. Therefore, the impact force of the variable frequency screw air compressor is very small, and the impact force on the entire power grid and the entire mechanical system is also very small and can be ignored. 2. Air pressure stability of variable frequency screw air compressor The variable frequency screw air compressor uses the stepless speed regulation characteristics of the frequency converter, so it can be started slowly through the controller or the PID regulator inside the frequency converter. However, in some places where the air consumption fluctuates greatly, the frequency conversion screw air compressor can quickly stop the conditioning response. Compared with the power frequency driven air compressor, the variable frequency screw air compressor has an exponentially higher air pressure stability. 3. The AC power supply of the variable frequency screw air compressor has better voltage compliance. The inverter of the variable frequency screw air compressor can adopt over-modulation technology, so that the AC power supply voltage can still output enough torque to drive the variable frequency screw under the condition of low The motor of the air compressor stops working. And it is assumed that the time when the current and voltage are slightly higher will not cause the output voltage to be too high. 4. The noise of the frequency conversion screw air compressor is low. Therefore, the air compressor energy saving evaluation should be based on the working conditions, and the assessment basis is not yet complete, at least in the variable working condition assessment concept is relatively shallow, few companies have formulated the "frequency (variable) air compressor technical conditions" standard to qualitative frequency conversion () The energy efficiency level of the air compressor. At present, there are two options for air compressors on the market, one is the more popular all-in-one type, and the other is the split direct connection type.


This will extend the service life of the air compressor! 1. Regular maintenance and maintenance of air compressor maintenance, regular maintenance is essential. One is to take precautions to kill defects before they occur, and the other is to maintain the stable operation of the air compressor. There are some vulnerable parts in the air compressor, which should be changed regularly within the operating period of the rules to avoid part defects and cause problems with the air compressor. An inspection is to be done after 300 hours of normal operation, and the inspection frequency is determined by itself according to the application situation. Check accessories and cables regularly, and replace them immediately if they are damaged. In addition, keeping the filter clean can avoid many equipment defects. A dirty filter will reduce the performance of the compressor and the service life of the compressor. Clean the filter in time and insist that the machine is clean and dry without oil stains, so that its performance can be fully utilized. 2. Select high-quality lubricating oil to strictly control the oil quality and quantity of the lubricating oil. Assuming that the quality is not good or the amount used is large, the lubricating oil will mix with dust and become a hardened substance, which will interact with the organic matter in the lubricating oil under certain temperature and pressure. The mixed coking becomes black oil residue and forms carbon deposits, which not only affects the normal operation of the valve, valve disc, spring, and piston ring, but also causes the air compressor to overheat and cause an explosion. 3. Daily maintenance To ensure the long-term use of the air compressor, daily maintenance is the key. As a large-scale general-purpose mechanical equipment, the air compressor has a complex structure and a powerful function. To maintain this powerful function, it is necessary to check its working status from time to time. Daily tasks usually include: draining oil and gas barrels, checking the oil level, preparing peripheral equipment, such as sending water and electricity, opening the outlet valve of the compressor, etc. 4. Operating environment The operating environment temperature of the air compressor should be maintained at 5-40 degrees Celsius. It cannot be placed in an unshielded place, and do not work in a humid place or a place where flammable and explosive liquid gas or volatile gas is stored. Keep the environment clean and tidy to avoid unnecessary accidents. When the air compressor is not in use, the air in the air storage tank should be discharged, the sewage in the air storage tank should be drained, and it should be stored in a monotonous environment. 5. Sewage cleaning The air compressor is operated in a place with a lot of dust particles for a long time, and it is easy to produce dirt. Therefore, the sewage in the air compressor tank must be discharged in time. It is recommended to discharge it at least once a week. This can be determined according to the working environment. Some important parts also need to be cleaned and maintained frequently, especially the filter elements such as oil and gas separators and air filters.


In the past two years, it has become synonymous with energy-saving pioneers in the air compressor industry, causing some air compressor manufacturers to use "air compressors that you can buy without money" as advertising slogans to attract users' attention. Of course, in terms of the relative significance of motor energy saving, using the same control method is definitely higher than traditional asynchronous motors. The main point of energy saving is that 80% of the air compressors are in a variable load state, and the frequency conversion speed control is used according to the amount of air consumption to automatically meet the needs of users and reduce the loss of useless work. The structural principle of the screw air compressor and the motor is to extend the shaft of the male rotor ③ of the screw head to form a coaxial connection with the rotor ② of the motor. Then the stator and casing of the motor are fixed on the casing of the screw head to form an integration of the motor and the head. The stator is cooled by the self-contained wind blades on the rotor and the ventilation slots of the motor winding and the casing. This structure is a trend of innovation and development in many electromechanical equipment places, such as air conditioning compressors, elevator traction machines, electric hoists, etc., so it has been praised and liked by many users. The air compressor screw integrated machine has become popular in the market due to its small size, simple structure, high system efficiency, and low price. However, this design has many drawbacks from the point of view of the motor profession, and the potential risks are relatively large.


What should be paid attention to when the air compressor is in operation? 1. Pay attention to check the oil level in the fuel tank to check whether it is within the safe range of the rules; 2. The start and stop of the compressor should be stopped after unloading, especially when driving, and it should be stopped under no load. Load loading after driving should be stopped slowly. 3. During maintenance, pay attention to check the wear of the piston guide ring, piston ring and packing seal, the condition of each mating surface and friction surface; 4. In winter, in order to prevent the equipment from being frozen due to freezing, it should be checked after the machine is stopped. Clean the cooling water in the system; 5. Pay attention to the sound of the unit when the machine is running. If there is noise or collision sound, take specific measures based on the theoretical situation; 6. In the air compressor If the machine is defective, and when the staff is required to stop the maintenance, the machine should be stopped after the operation; 7. Always check the values displayed on the meters, compare the rule values, and see if the machine is within the range of normal requirements; 8. The various equipment should be checked regularly. For example, safety valves and instruments are usually overhauled once a year, and should be corrected in time when problems are found; 9. Check the current, voltage and temperature rise of the motor in accordance with the instructions and rules of the motor factory.

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