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Refrigeration compressor 11 ask, can you answer a few

Refrigeration compressor 11 ask, can you answer a few 1. Why control the impurity content and moisture content of the compressor and air conditioning system? Impurities enter the friction surface of the moving parts of the compressor pump body, which can cause abnormal scratches and wear. Impurities entering the solenoid valve, expansion valve, control valve, capillary tube and shut-off valve in the freezer system can block the valve hole or make the valve closed tightly And failed. The moisture of the compressor mainly produces the following adverse effects: Capillary tube and expansion valve will cause ice blockage, and evaporator cooling tube will also freeze The metal material is corroded, forming deposits The valve core is corroded and the closure is not tight The phenomenon of "copper plating" on the surface of compressor body parts Accelerate the deterioration of materials such as insulating materials, refrigerants, and refrigeration oil 2. What effect will the low voltage have on the air conditioning system? If the voltage is too low, it is much lower than the specified operating voltage range of the compressor. Since the stall current value may not reach the operating current specification of the protector, it will cause the protector to fail to operate in time, causing the compressor motor to overheat or even burn. . 3. What is the function and principle of the compressor protector? The function of the compressor protector is mainly to protect the compressor from accidents such as motor burnout when the compressor is in an abnormal situation. The main principle is to rely on the internal heating wire of the protector and the internal resistance of the bimetallic sheet to cause the bimetallic sheet to act through the combined action of current heating and external conduction heat, thereby cutting off the circuit and protecting the compressor from damage. 4. How to make basic judgment and treatment after the compressor fails? No suction and discharge pressure: first check the basic items such as compressor wiring and pipeline connection, main and auxiliary coil impedance, compressor insulation withstand voltage and so on. If they are normal, it is recommended to remove the compressor for idling to check whether there is suction and exhaust. Suction and exhaust method: When the compressor is running, press your finger against the exhaust port for a few seconds, and then release it. Observe whether there is gas ejection. It is normal for a small amount of oil to be ejected. If there is suction and discharge, the discharge pressure is large, indicating that the compressor can work normally, otherwise the compressor is abnormal. 5. Why should liquid refrigerant be prohibited from flowing back into the suction chamber of the compressor? If the liquid refrigerant directly enters the suction chamber of the compressor, during the rotation of the crankshaft, the compressor volume becomes smaller and smaller, and the pressure rises sharply, causing abnormal force or even damage to the pump body parts and valve plates. Liquid shock can also cause abnormal vibration and noise of the compressor. 6. Why shouldn't the refrigerant recovery time of the air conditioner be too long? The operation time of the air conditioner for refrigerant recovery should not be too long. Because the refrigerant recovery time is too long, the temperature of the exhaust gas will be very high due to the extremely thin refrigerant gas sucked in, causing the temperature of the pump body parts of the compressor to rise rapidly. Excessively high temperature makes the expansion difference of each part too large, which causes the fitting gap of some parts to become smaller or even disappear, and eventually produces abnormal scratches or wear. 7. What is the effect of connecting the wrong line of the compressor? Why can't the protector protect it? The wrong connection of the compressor will make it unable to work normally. According to different wiring error methods, there will be stalling, reverse rotation, and stop after starting, and it may cause the compressor motor to burn directly. Because the compressor protector is selected based on the compressor's correct wiring and the operating characteristics of the protector under abnormal operating conditions, it is impossible to ensure that the compressor is protected when it is connected to the wrong line. In the case of miswiring, it is difficult to protect the motor through the protector. 8. For the same system, do I need to adjust the system for compressors of different manufacturers? Because the performance characteristics of compressors produced by different companies are different, for a specific compressor, only under specific refrigerant flow rate, suction and discharge pressure, temperature and other conditions will show the best performance. Therefore, in the same refrigerator system, it is best to adjust the system separately when using different compressors to ensure that the compressors used work properly at the appropriate refrigerant flow rate, suction and exhaust pressure, and temperature conditions, so that they can be effective Extend the service life of the compressor and achieve the best use effect. 9. Why is the compressor motor coil temperature required during operation? Insulation class of insulating materials used in compressor motors (Insulation class: A (105°C), E (120°C), B (130°C), F (155°C), H (175°C)) And heat resistance characteristics. For the motor enameled wire, excessive temperature will lead to a reduction in the amount of film cocoons, a decrease in friction resistance K, easy peeling, an insulation breakdown voltage and a decrease in insulation resistance, etc., which greatly reduces the service life. In addition, the motor temperature is too high can cause the polymer material in the insulating material to dissolve too much, these substances will precipitate and gather somewhere in the system or the compressor exhaust, etc., thereby affecting the performance of the compressor and the system. In addition, the coil temperature is too high will cause the compressor motor efficiency to decrease. 10. Why can the compressor be started again at least 3 minutes after the compressor is turned off? When the compressor starts, there will be more refrigerating machine oil entering the air conditioner system along with the refrigerant circulation. If there is not enough running time, the refrigerating machine oil will not be able to return to the compressor cavity in time, and frequent shutdown after a short start will cause the compressor interior Low oil level can easily cause poor lubrication of mechanical moving parts of the compressor. In addition, the shutdown time of more than 3 minutes is mainly to give the system enough pressure balance time, otherwise the compressor will not start normally due to the presence of high and low pressure. 11. Why can't the compressor run under "vacuum conditions"? The so-called "vacuum condition" is not an absolute vacuum state, but a very low pressure state, and gas molecules will ionize at very low pressure. According to the actual experimental results, the compressor terminal has the lowest breakdown voltage of about 3.5mmHg internal pressure of the compressor. When it is energized, it will easily cause breakdown and internal carbon deposits, which will damage the insulation of the sealed terminal. An accident occurred in which the sealing post burned out. Therefore, power should be avoided when the compressor is evacuated.

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