Have you mastered the general troubleshooting methods for ammonia refrigeration compressors?
In the refrigeration system of the cold storage, the refrigeration compressor is the core equipment, usually called the refrigeration host. At present, piston refrigeration compressors are mostly used in small and medium-sized cold storage refrigeration systems. Due to the different refrigerants, they are often divided into ammonia refrigeration compressors and fluorine refrigeration compressors. Today zui cold bacteria mainly introduces the common piston ammonia refrigeration offline Faults and ideas. 1. The refrigeration compressor cannot start normally Overhaul ideas 1. Check whether the power supply voltage is too low or the motor circuit is connected badly. If it is indeed that the grid voltage is too low, start again after the grid voltage returns to normal: if the line is in poor contact, the connection between the line and the motor should be detected and repaired. 2. Check whether the exhaust valve plate is leaking: If the exhaust valve plate is damaged or the seal is not tightly leaked, the pressure in the crankcase will be too high, causing it to fail to start normally. Just replace the exhaust valve plate and sealing line. 3. Check whether the energy regulating mechanism is malfunctioning. Mainly check whether the oil supply pipeline is blocked, the pressure is too low, the oil piston is stuck, etc. and repair it according to the cause of the failure. 4. Check whether the temperature controller is damaged or out of adjustment; if it is out of adjustment, the temperature controller should be adjusted; if it is damaged, it should be repaired or worse. 5. Check whether the pressure relay is malfunctioning. Check the pressure relay and reset the pressure parameters. Second, there is no oil pressure Overhaul ideas 1. Check whether there is oil leakage or blockage at the connection of the oil pump piping system. The joint should be tightened; if it is blocked, the oil pipeline should be cleared. 2. Is the oil pressure regulating valve opened too large or the valve core falls off? If the oil pressure regulating valve is improperly adjusted, the oil pressure regulating valve should be adjusted and the oil pressure should be adjusted to the required value; if the spool falls off, the spool should be reinstalled and tightened firmly. 3. If there is too little oil in the crankcase or there is ammonia liquid, the oil pump will not enter oil. If there is too little oil, it should be refueled in time; if it is the latter, it must be shut down in time to eliminate ammonia. 4. The oil pump is severely worn. The gap is too large, causing the oil pressure to fail. For this situation. The oil pump should be repaired and replaced directly when the fault is serious. 5. Check whether the connecting rod bearing, main bearing bush, connecting rod small end bushing and piston pin have been severely worn. At this time, relevant parts should be replaced in time. 6. The rear end cover gasket of the crankcase is misplaced, blocking the oil inlet passage of the oil pump. Disassembly and inspection should be done and the position of the gasket should be fixed again. Three, a large amount of foam is generated in the crankcase Maintenance ideas The lubricating oil in the crankcase foamed and the liquid hit was caused by the following two reasons: First, there is a large amount of ammonia liquid mixed in the lubricating oil. When the pressure drops, the ammonia liquid will evaporate and cause a lot of foam. In this regard, the ammonia in the crankcase should be evacuated. Second, there is too much lubricating oil added in the crankcase, and the large end of the connecting rod stirs the lubricating oil to cause a lot of foam. For this, the excessive lubricating oil in the crankcase should be released to make the oil level reach the specified oil surface line. can. Fourth, the oil temperature is too high Maintenance ideas 1. Inappropriate assembly of shaft and pad. The gap is too small. The size of the shaft and tile assembly gap should be adjusted so that the gap meets the standard requirements. 2, the lubricant contains impurities. Cause the bearing bush to be rough. In this regard, the brushed bush should be scraped flat. And replace with new oil: if the tiles are severely rough, replace with new tiles. 3. The shaft seal friction ring is installed too tightly or the friction ring is rough. The shaft seal friction ring should be readjusted. If the friction ring is rough, replace it with a new one. 4. If it is caused by the excessively high suction and discharge temperature of the compressor, the liquid supply valve of the system should be adjusted appropriately to restore the suction and discharge temperature to normal. 5. The pressure in the crankcase increases Overhaul ideas 1. The piston ring is not tightly sealed, which leads to high pressure to low pressure. The new piston sealing ring should be replaced. 2. The exhaust valve is not closed tightly, causing the pressure in the crankcase to rise. The air tightness of the exhaust valve seat should be checked. If the sealing is not tight, replace the new valve in time. 3. The tightness between the cylinder liner and the base becomes poor: the cylinder liner should be removed, the joint should be cleaned and sealed, and then reassembled. 4. Excessive ammonia liquid enters into the crankcase, and the pressure rises after evaporation: just evacuate too much ammonia liquid in the crankcase. VI. Failure of energy regulation mechanism Maintenance ideas 1. Check whether the oil pressure is too low or the oil pipe is blocked: if the oil pressure is too low. Adjust and increase the oil pressure; if the oil pipe is blocked, the oil pipe should be cleaned and unblocked. 2. Whether the oil piston is stuck: remove the oil piston to clean it and replace the dirty oil. Re-assemble correctly. 3. Whether the rod and the rotating ring are installed incorrectly, causing the rotating ring to be stuck; it is important to check the assembly of the rod and the rotating ring, and repair it until the rotating ring can rotate flexibly. 4. Check whether it is caused by improper assembly of the oil distribution valve. If it is to apply the ventilation method to check whether each working position is appropriate, and readjust the oil distribution valve. Seven, too much waste heat Maintenance ideas 1. Check whether the ammonia in the evaporator is too small or the opening of the liquid supply valve is too small. If the system is short of ammonia, it should be replenished normally in time; if the liquid supply valve is not adjusted properly, the liquid supply: valve should be opened to a suitable position. 2. Whether it is the poor insulation of the return air pipeline insulation layer or damaged by moisture. The insulation layer should be checked thoroughly and replaced with new insulation materials. 3. The suction valve is leaking or ruptured and damaged: If the leakage is slight, the valve can be ground to make it no longer leaking; if it is broken, the suction valve should be replaced directly. 8. The suction pressure of the compressor is lower than the normal evaporation pressure. Overhaul ideas 1. The opening of the liquid supply valve is too small, which can lead to insufficient liquid supply, so the evaporation pressure will drop. In this regard, it is sufficient to open the liquid supply valve to an appropriate level. 2. The valve in the suction line is not fully opened or the spool is off. If it is the former, the valve should be fully opened; if the spool falls off, the spool should be reinstalled. 3. There is a lack of liquid ammonia in the system, even if the pressure valve is opened, the evaporation pressure is still low. At this time, an appropriate amount of liquid ammonia should be added according to the actual situation. 4. The return air pipeline is thin, or there is a liquid sac in the return air pipeline. If the pipe diameter is too thin, a suitable return air pipe should be replaced; if it exists; a liquid sac; ; Liquid sac; segment removed, and re-welded pipeline. Nine, compressor wet stroke Maintenance ideas 1. When the compressor is started, if the suction valve is opened too fast, it will cause wet stroke: Therefore, the suction valve should be opened slowly when starting to avoid wet stroke and damage to the compressor. 2. If the opening of the liquid supply valve is too large, it will also cause a wet stroke. At this time, just close the liquid supply valve appropriately. 3. When the cold storage returns to normal temperature after defrosting, slowly open the suction valve and observe the operation of the refrigeration compressor at any time. If the return air temperature drops too fast, you should temporarily stop the opening, and when the operation returns to normal, continue to open slowly. Ten, there is a knocking sound in the crankcase Maintenance ideas 1. Check whether the gap between the connecting rod head bush and the shaft journal is too large. At this time, the gap should be adjusted, or a new tile should be replaced directly. 2. If the gap between the main bearing and the main journal is too large, collision and friction will occur, resulting in knocking sound. New tiles should be repaired or replaced. 3. Check whether the split pin is broken and the connecting rod nut is loose. If yes, replace with a new split pin and tighten the connecting rod nut 4. If the center of the coupling is not right or the keyway of the coupling is loose. Should adjust the coupling or repair the key slot or replace the new key. 5. The main bearing steel ball is worn and the bearing frame is broken. For this, just replace the new bearing. Eleven, the temperature of the cylinder wall is too hot Maintenance ideas 1. If the oil pump fails, which causes the oil pressure to be too low or the oil circuit is blocked: stop the machine for a full overhaul. 2. Check whether the gap between the piston and the cylinder wall is too small or the piston deviates: At this time, the piston should be adjusted. 3. The safety block or false cover is not tightly sealed, resulting in high and low pressure gas leakage. Measures should be taken to repair this to improve the sealing performance. 4. Check whether the suction temperature is too high. Adjustments should be made to lower the suction temperature. 5. If the quality of lubricating oil is not good, the viscosity is too small. Should be shut down and replaced with new lubricants. 6. Check whether the scale in the cooling water jacket is too thick or the amount of water is insufficient: if the scale is too thick, it should be removed in time; if the amount of bitter water is insufficient, the amount of cooling water should be increased 7. Check whether the suction and exhaust valves are damaged. If damaged, replace the suction and exhaust valves in time. 8. Check whether the piston ring is severely worn. If yes, replace the piston ring with a new one. Twelve. The shaft seal has serious oil leakage Overhaul ideas 1. Check whether the shaft seal is mismatched, causing serious oil leakage of the shaft seal. The shaft seal should be assembled correctly. 2. Check whether the friction surface of the moving ring and the fixed ring has been roughened. If the fuzz is severe, the sealing surface should be carefully ground and reassembled. 3. If the rubber sealing garden is aging or the tightness is not set properly, oil will leak: For this, a new rubber garden should be replaced and the appropriate tightness should be adjusted. 4. Check whether it is due to the weakening of the elasticity of the shaft seal spring that causes the shaft seal to leak oil: remove the original spring and replace it with a new one of the same size. 5. Check whether the sealing performance of the back of the fixing ring and the shaft seal gland has deteriorated. In this regard, remove the fixing ring, clean the back ring and reassemble it. 6. If the crankcase pressure is too high, it should be adjusted. But before stopping, lower the pressure of the crankcase and check whether the exhaust valve is leaking. 13, the shaft seal oil temperature is too high Maintenance ideas 1. Check whether the lubricating oil is insufficient, or the oil pipeline is blocked. If the oil is insufficient, add lubricating oil in an appropriate amount; if the pipeline is blocked, unblock the oil pipeline. 2. Check whether the lubricating oil is dirty or has deteriorated. In this regard, the filter should be cleaned and replaced with new oil. 3. Check whether the friction surfaces of the moving ring and the fixed ring are pressed too tightly. The elastic strength of the spring should be adjusted appropriately 4. The packing gland is too tight. The gland nuts should be adjusted evenly to avoid being too tight, causing the shaft seal oil temperature to be too high. 5. Check whether the main bearing assembly clearance is too small. In this regard, the gap should be adjusted appropriately.
