1.1 The main features of the screw air compressor. The characteristics of the screw air compressor are the same as the principle of the piston compressor from the principle of gas pressure, and the movement principle of the component is similar to that of the centrifugal compressor, so the screw air compressor has two compressors at the same time. Features. From the perspective of service life, since the screw-type air compressor has fewer parts and has no more susceptible parts, its running performance and overhaul interval are relatively long, and the working performance is relatively reliable. In the process of use, the operator can realize unmanned operation without special learning and training, and the maintenance is relatively simple. In the process of high-speed operation of the screw air compressor, no basic operation can be realized. The environmental requirements of the compressor equipment are relatively low, mainly because the dynamic balance of the compressor itself is good, and it is not limited by the environment and conditions, and its own The adaptability is also outstanding. The screw air compressor has the characteristics of forced gas transmission. The gas discharge is not restricted by atmospheric pressure and can be discharged freely. It has a large application space in production. The rotor tooth surface of the screw air compressor actually has a gap, so it can withstand liquid impact, and can be used to pump liquid-containing gas, dust-containing gas, and easily polymerized gas. 1.2 Principle of screw air compressor. The principle of the screw air compressor is mainly to suck the air into the compression main machine through the filter, and the air is pressed by the rotating teeth by the spiral rotor under the driving of the motor. The mixed gas is discharged from the main compressor into the separation system. The tangential exhaust port enters the cylinder, and the exhaust gas exiting the exhaust gas is rotated through the inner wall of the cylinder to collect more oil and drip into the cylinder pool. The internal baffles are used to keep the remaining oil droplets flowing with the air on the inner wall. In addition to inertia, more and more oil droplets go out of the air and return to the oil pool. When the airflow enters the separation core to form droplets, the oil droplets accumulated on the outer first stage fall into the oil pool, and the oil droplets collected on the inner second stage gather in the vicinity of the separation core outlet, and are installed on the oil return line. The filter and orifice joints are pumped back into the compression mains inlet. At this time, the airflow has substantially no cooling oil. After exiting the separator, it enters the water gas cooler for cooling, and then the system is sent out to the mixing station for mixing. The oil separated by the separator is cooled by the oil water cooler and returned to the compression host. The compressed compressor of the loop is cooled. 2 common faults and elimination of screw air compressors. 2.1 Trouble shooting compressor over temperature is too high. The fault of the screw air compressor with too high exhaust gas temperature should be carefully analyzed and processed in time. In the search for the cause, first determine whether the temperature of the equipment room is abnormal, whether the state of the oil level deviates from the normal state, determine whether the components of the machine are faulty, and use the temperature detector to judge when the fault is eliminated. It is necessary to check the temperature difference between the inlet and outlet of the oil cooler. If the temperature is greater than the standard range, it is proved that the oil flow is insufficient, the oil circuit is blocked, or the temperature control valve is not opened, so the oil filter needs to be inspected. The imbalance of oil flow in some models is also the main cause of excessive temperature. When checking the temperature control valve, the valve core can be removed, one end of the temperature control valve is closed, and the oil is forced to pass through the cooler. If the above method is not solved, it is necessary to consider whether the oil path is blocked by foreign matter. In some cases, the exhaust temperature is too high due to poor heat dissipation. The inspection direction should be checked from the water cooler. Check if the water volume of the water cooler is sufficient, if the inlet water temperature is too high, and if there is scale in the cooler. Grease is generated, and the above problems can be solved to ensure the normal operation of the cooler, thereby ensuring the normal heat dissipation of the compressor. When inspecting air-cooled equipment, pay attention to check whether the radiator is dirty, whether the fan is running abnormally, whether the air volume is sufficient, whether the air duct is blocked or the air duct is too long, which is the main cause of overheating of the compressor exhaust. If the above treatment method can not solve the problem of high temperature of the exhaust of the machine, it indicates that the heat generated by the machine head is beyond the normal range. It should be checked whether it is overpressured, whether the oil is wrong, whether the oil is aging, whether it is a bearing problem or even the end face friction. In addition, if there is a fuel cut-off valve, it is necessary to check whether there is a fault. The fault of the oil-disconnect valve will generally jump when the power is turned on, and the temperature will rise linearly. 2.2 Safety valve take-off troubleshooting. The safety valve jump failure of the screw air compressor is difficult to detect during the operation of the equipment. During the operation of the air compressor, the safety valve of the oil and gas barrel is irregularly jumped, and the monitoring process shows normal operation. When troubleshooting, first make sure that the safety valve is working properly, and then check if there is any blockage at the outlet. If there is a blockage, the pressure will be too high, causing the safety valve to automatically take off. During the detection process, the pressure at the outlet of the pipeline should be monitored for a long time. When the pressure is too high, the air pressure will be automatically unloaded. If the safety valve is not caused by pressure, check the pressure valve at the outlet of the oil and gas tank to see if it is working properly. During the inspection, it was found that the minimum pressure valve spool contacted the humid air for a long time, and the action was slow and insensitive, causing the compressed air to instantaneously high pressure and take off the safety valve, and then operate normally after the action. Therefore, after cleaning and repairing the minimum pressure valve, the air compressor is operating normally. 2.3 Motor failure of the intake valve. The electrical fault of the screw air compressor is also one of the common faults. The intake valve leaks through the cooler, the cooler cooling water enters the main engine, and then continues to overflow into the intake valve. After the cooler is leaked and repaired, the test machine will not rise in pressure and check the intake valve with zero opening. In the no-load simulation action, the intake valve opening is still zero, and the self-test indicates that the intake valve is faulty. After measurement, the intake valve stepper motor coil burned out, the re-coiled coil was removed, the analog intake valve was operated normally, the self-checking intake valve was normal, the loading and running air pressure still could not rise, and then checked, and the stepper motor torque was found. Not enough, the intake valve can not be opened during loading, re-winding to meet the manufacturer's requirements, the air compressor intake valve works normally, and the operation is normal. Be patient when encountering such problems, find out the cause of the failure and eliminate it in time. 2.4 The compressor can not be decompressed and troubleshooting. During the operation of the compressor, if the working state of the compressor is normal and the wind can be started, but the wind cannot be pumped to increase the wind pressure, the power of the wind pump motor and the air compressor itself should be found in time. In the inspection process, first check the power supply on the compressor and the locomotive. If the voltage of the motor is too low, the motor will rotate but the wind pressure will not increase. In such a situation, you must wait until the network voltage and voltage are stable before hitting the wind. If the power supply voltage meets the requirements, further check the pressure maintenance valve for leaks, whether the intake valve is stuck or the valve plate is stuck. If it is caused by the above reasons, repairs are required and the pressure maintenance valve or intake valve is replaced if necessary. If the above two conditions are normal, it is necessary to judge whether the internal parts of the compressor are faulty. For example, the yin and yang rotors wear too long, causing the yin and yang rotor gap to be too large, and the pump can not afford the wind. The most obvious feature of this fault phenomenon is the compressor. The oil level does not change and is always the same as when it is static. When this fault occurs, the compressor needs to be lifted for disposal. Screw-type air compressors occupy an extremely important part in the production operation of enterprises. Frequent troubleshooting will have a great impact on the stability, high efficiency and quality of production. Therefore, the mastery of the principle of screw air compressors and daily life Maintenance is very important. In the usual maintenance, it is necessary to ensure the normal operation of the screw air compressor and provide reliable guarantee for the production of the enterprise. Dioctyl Terephthalate,Pvc Chemical Plasticizer,Dotp Plasticizer,Auxiliary Agent Oil Shandong Langhui Petrochemicals CO.,LTD , https://www.langhuiplasticizer.com
Analysis of the principle and problem solving of new compressor
1The characteristics and principle of screw air compressor.