Correct treatment method after refrigeration compressor burned out

Correct treatment method after refrigeration compressor burned out I. Introduction: 　　If the compressor burns down or mechanical failure or wear has caused the inevitable pollution of the refrigerant system, the situation is as follows: 　　 1. Residual refrigerating oil has been carbonized, contains acid, and dirt exists in the tube. 2. After the compressor is dismantled, the original system tube must be corroded with air, causing condensation effect, increasing the residual of moisture, and corroding with the copper tube and pipeline parts, causing fouling film, affecting the operation after the new compressor Features. 　　 3. Part of the worn copper, steel and alloy dirt powder must have flowed into the pipeline to block part of the thin tube pores. 　　 4. The original dryer has quickly absorbed a lot of water. 　　 In the above cases, the system is smelly and can be known immediately. 　　 Second, without processing the system, the result after directly replacing the new compressor is as follows: 　　 1. Vacuuming cannot be done completely, and the vacuum pump is also easily damaged. 　　 2. After adding the new refrigerant, the refrigerant only has the function of cleaning the system parts, and the pollution of the whole system still exists. 　　 3. The new compressor and the refrigeration oil, the refrigerant are all contaminated within 0.5-1 hour, the second pollution will start immediately as follows: 　　3-1 After the freezing oil is not pure, it starts to destroy the original lubricating properties. 　　 3-2 Metal dirt powder entering the compressor may penetrate the motor insulation film and short circuit, and then burned. 　　 3-3 The metal dirt powder sinks into the oil, causing the friction between the shaft and the shaft sleeve or other running parts to increase, and the machine bites. 　　3-4 After mixing refrigerant, oil and original pollutants, acidic substances, it will cause more acidic substances and increased water content. 　　3-5 The phenomenon of copper plating rises, the mechanical gap is reduced, the friction is increased and stuck. 　　 4. If the original dryer is not replaced, the original water absorption and acidic substances will be released. 　　 5. The acid substance will slowly erode the insulation film of the motor enameled wire. 　　 6. The cooling effect of the refrigerant itself is reduced. 　　 Under the above conditions, the new compressor will be completely burned out within about 1 month. 　　 3. How to deal with a host refrigerant system whose compressor has burned out or failed is a more serious and technically demanding problem than the production of a new host. However, it often happens to be completely ignored by most technicians, even thinking that it is broken anyway, just put on a wrong concept! Caused some disputes that the compressor quality was poor, or that others used it improperly. 　　 1. The compressor is damaged, so of course it needs to be replaced, and it is very urgent, but before taking action to prepare materials and tools, you must do the following: 　　1-1 Whether the quality of the contactor, overloader, computer, or temperature control in the control box has gone wrong, must be checked one by one to confirm that there is no problem. 　　1-2 Whether the various setting values have changed, and analyze whether the compressor is burnt due to the change of the setting value or the wrong adjustment. 　　1-3 Check the abnormal condition on the refrigerant pipe and correct it. 　　1-4 Determine the compressor burned or stuck, or half burned: 　　 1-4-1 measures the insulation with a shaker and the coil resistance with a three-meter. 　　1-4-2 Talk with the customer related personnel to understand the overview of the causes and consequences, as a reference for judgment. 　　1-5 Try to drain the refrigerant from the liquid pipe part, observe the residue discharged from the refrigerant, smell its taste, and watch its color. (After burning, it is smelly and sour, sometimes pungent and spicy) 　　1-6 After removing the compressor, you must pour out a little freezing oil and observe the color to judge the situation. Before leaving the host, wrap the high and low pressure two pipes with tape or close the valve. 　　 2. According to the above inspection work, there may be three compressor failure conditions: 　　2-1 The compressor motor is not burned, the current is normal, and only the noise is large. (Mechanical issues) 　　 2-2 Compressor motor is not burned, it can run, the machine is good, but the current is large and overloaded, easy to trip. 　　2-3 The compressor motor has been burned out and cannot be operated. The machinery is not good or bad. 　　According to three circumstances, the procedure for updating the compressor is as follows: 　　2-1 The compressor motor is not burned, the current is normal, and only the noise is large. (Mechanical issues) 　　 2-1-1 In this case, the oil is not odorous, only contaminated as a powder gray, and sinks inside the compression, the pollution in the system tube is not obvious. 2-1-2 Remove the original dryer and use nitrogen as much as possible, (pressure at least 7KG/CM2) to blow out the high-pressure end pipeline from the high-pressure end, as well as the segmented blow-out liquid pipe and low-pressure end parts It is now observed whether the blown matter is oil, dirt, water, or other foreign matter or foreign matter. 　　 2-1-3 After replacing the new compressor, install a new dryer, and add a nitrogen pressure to 10KG/CM2 for leak detection. When it is not leaking, the remaining nitrogen is discharged into the atmosphere from the high pressure side filling and filling valve. 　　 2-1-4 At the same time evacuate at least 1000Microns from the high and low pressure ends. 　　2-1-5 The liquid refrigerant is added from the liquid pipe part, and the test can be started after the amount of refrigerant reaches 80%~90%. (The compressor must be heated for 2 hours) 　　 2-2 Compressor motor is not burned, it can run, the machine is good, but the current is large and overloaded, easy to trip. 　　 2-2-1 In this case, the oil is slightly scorched and discolored, and the system piping is still clean, but in the system where the metal surface has been acidified, the inner wall of the copper tube becomes red. 　　 2-2-2 After installing a new compressor, install a new dryer, and add nitrogen pressure to 10KG/CM2 for leak detection. When it is not leaking, the remaining nitrogen is discharged into the atmosphere from the high-pressure end angle valve. 　　 2-2-3 At the same time evacuate at least 1000Microns from the high and low pressure ends. 　　 2-2-4 The liquid refrigerant is added from the liquid pipe part, and it can be turned on for testing after reaching 80%~90% refrigerant amount. (The compressor must be heated for 2 hours) 　　 Must pay attention to this situation: the stability of the customer's original power supply and possible load are too large, or the result of too frequent stop control. If these are not resolved, the danger will always exist and cannot be completely resolved. 　　2-3 The compressor motor has been burned out and cannot be operated. The machinery is not good or bad. (There are two ways to solve it, fix it) 　　A, Method one 　　A-1 The most serious cases of this kind are oil and refrigerant stinking, burning smell, spicy smell, oil blackening such as black ink, the tube is full of dirty black film, and will have moisture 　　 a-2 Remove the dryer, short-circuit this part as a copper pipe joint or temporary detachable takeover. 　　A-3 A chemical pump is used to pump the cleaning agent (trichloroethane, dichloromethane) from the high-pressure pipe into the pipeline system for cleaning and circulating flow. Note: 　　 1. Pay attention to the safety of the operator when cleaning. 　　 2. During the cleaning, it will be found that the cleaning agent is dirty by Yu Jiyu, who knows the serious pollution situation after the compressor burns out. If necessary, the cleaning agent must be replaced and cleaned multiple times. 　　A-4 Replace with nitrogen pressure of about 7KG/CM 2~10KG/CM2 and blow the whole system dry and cold until there is no residual cleaning agent. (evaporation) 　　A-5 Replace the new compressor, install a new dryer, and add nitrogen pressure to 10KG/CM2 for leak detection. When it is not leaking, the remaining nitrogen is discharged to the atmosphere from the high-pressure end valve. 　　 a-6 from the high and low pressure ends simultaneously evacuated to at least 1000Microns. 　　A-7 Check all electrical appliances and power supply. 　　A-8 The liquid refrigerant is added from the liquid pipe part, and it can be turned on for testing after reaching 80%~90% refrigerant amount. (The compressor must be heated for 2 hours) 　　B、Method two 　　B-1 Remove the desiccator and blow through the entire pipeline with high-pressure nitrogen at a pressure of about 10KG/CM2. 　　 b-2 Replace with a new dryer (The decontamination capacity of the water absorption capacity of the liquid tube dryer is only twice the capacity used by the original system.) 　　B-3 Check all parts, the quality of external control parts must be good. 　　B-4 Leakage detection of the whole system, and the remaining nitrogen is discharged into the atmosphere through the high pressure end angle valve. 　　B-5 From the high and low pressure ends, evacuate at least 1000Microns at the same time. 　　B-6 The liquid refrigerant is added from the liquid pipe part, and the test can only be started after the amount of refrigerant reaches 80%~90%. (The compressor must be heated for 2 hours) 　　B-7 After the operation, special attention must be paid to the occurrence of abnormalities, and emergency treatment. 　　B-8 Run about half an hour after starting, immediately replace the dryer, and check its contamination 　　B-9 The second new dryer must be operated for another 3 hours. Observe the results and replace them if necessary until the system is completely clean. 　　B-10 Finally, change the compressor refrigeration oil, and observe the original new oil for the first time. Note: 　　A. When replacing the dryer above, the air should not enter the system again. 　　 b. In serious cases, the compressor must be disassembled again to change the oil, and all the refrigerants should be released and replaced. 　　 Note: 　　 1. Make a visual inspection of the whole machine before starting up. 　　 2. Pay special attention to the power supply and voltage insulation. 　　 3. Do not start the compressor while adding the refrigerant after vacuuming, as this will cause the compressor to lose oil and give up its previous efforts. 　　 4. Do not directly add liquid refrigerant from the low pressure end, it will cause liquid blow and mechanical failure. 　　 5. When the above procedures are done completely, before starting the machine, you must also correct some of the poor quality of the electrical appliances that were found during the original inspection of the machine.

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