In a cold storage refrigeration system, a refrigeration compressor is a core device and is often referred to as a refrigeration host. Currently, small refrigerator in the refrigeration system uses a multi-piston type refrigerant compressors, depending refrigerant into the normally-fluoro ammonia refrigeration compressor and refrigeration compressor. Today, Xueyi Refrigeration mainly introduces common faults and treatment methods of piston ammonia refrigeration compressors. 1 Refrigeration compressor can not start normal maintenance ideas 1. Detect whether the power supply voltage is too low or the motor line is poorly connected. If it is true that the grid voltage is too low, then the grid voltage will return to normal and then restart: if the line is in poor contact, the connection between the line and the motor should be detected and repaired. 2. Check if the exhaust valve is leaking: If the exhaust valve is damaged or the seal is not leaking, the pressure in the crankcase will be too high, which will prevent it from starting normally. Replace the exhaust valve and seal line. 3. Check if the energy regulation 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 according to the cause of the failure. 4. Check if the temperature controller is damaged or misaligned; if it is an offset, adjust the temperature controller; if it is damaged, it should be repaired or worse. 5. Check if the pressure relay is malfunctioning. Repair the pressure relay and reset the pressure parameters. 2 No oil pressure Maintenance ideas 1. Check for oil leakage at the connection of the oil pump piping system or where the oil is blocked. The joint should be tightened; if it is blocked, the oil line should be cleared. 2. Whether the hydraulic pressure regulating valve is opened too much or the valve core is detached. If the oil pressure regulating valve is improperly adjusted, adjust the oil pressure regulating valve and adjust the oil pressure to the required value; if the valve core falls off, reinstall the valve core and tighten it firmly. 3. If there is too little oil in the crankcase or ammonia is present, the oil pump will not enter the oil. If the oil is too small, it should be refueled in time; if it is the latter, it should be shut down in time to remove the ammonia solution. 4. The oil pump is seriously worn. The gap is too large, causing the oil pressure to not come up. For this situation. If the oil pump is to be repaired, it should be replaced directly if the fault is serious. 5. Check if the connecting rod bearing bush, the main bearing bush, the connecting rod small head bushing and the piston pin have been seriously worn. In this case, replace the relevant parts in time. 6. The rear end cover gasket of the crankcase is misplaced, blocking the oil inlet passage of the oil pump. The disassembly inspection should be done and the position of the gasket should be re-fixed. 3 a lot of foam in the crankcase Maintenance ideas There is a liquid impact in the foaming of the lubricating oil in the crankcase, which is mainly caused by the following two reasons: First, a large amount of ammonia is mixed in the lubricating oil. When the pressure is lowered, the ammonia liquid evaporates and a large amount of foam is generated. In this regard, the ammonia in the crankcase should be evacuated. Second. Too much lubricating oil is added to the crankcase, and the large amount of foam in the crankshaft causes a large amount of foam. For this, excessive oil in the crankcase should be released to make the oil level reach the specified oil level. 4 Four oil temperature is too high Maintenance ideas 1. The shaft and tile assembly is not suitable. The gap is too small. The size of the shaft and tile assembly clearance should be adjusted so that the clearance meets the standard requirements. 2. The lubricating oil contains impurities. Causes the bearing to pull hair. In this regard, the hair shaft should be flattened. And replace the new oil: if the tile is severely damaged, replace the new tile. 3. The shaft seal friction ring is installed too tightly or the friction ring is pulled. The shaft seal friction ring should be re-adjusted. If the friction ring is severely pulled, replace the new friction ring. 4. If the suction and deflation temperatures are too high, the system's liquid supply valve should be properly adjusted to restore the suction and exhaust temperatures to normal. 5 Increased pressure in the crankcase School thinking 1. The piston ring is not tightly sealed, which leads to the replacement of the new piston seal ring with high pressure to low pressure. 2. The exhaust valve is not closed tightly, causing the pressure inside the crankcase to rise. The tightness of the exhaust valve seat should be checked. If the seal is not tight, the new valve should be replaced in time. 3. The sealing performance between the cylinder liner and the base is deteriorated: the cylinder liner should be removed, the joint should be cleaned and sealed, and reassembled. 4. Excessive ammonia solution enters the crankcase, causing the pressure to rise after evaporation: as long as the excess ammonia in the crankcase is evacuated. 6 Energy regulation mechanism fails Maintenance ideas 1. Check if the oil pressure is too low or the oil pipe is blocked: if the oil pressure is too low. Adjust the oil pressure to increase; if the oil pipe is blocked, the oil pipe should be cleaned. 2. Is it because the oil piston is stuck: the oil piston should be removed to clean and replace the dirty oil. Reassemble it correctly. 3. Is the tie rod and the rotating ring installed incorrectly, causing the rotating ring to be stuck? The assembly of the tie rod and the rotating ring should be checked and repaired until the rotating ring can be flexibly rotated. 4. Check if the oil distribution valve is improperly assembled. If the ventilation method is used to check whether the working position is appropriate, and the oil distribution valve is re-adjusted. 7 Return air heat is too large Maintenance ideas 1. Check if the ammonia in the evaporator is too small or the opening of the liquid supply valve is too small. If the system is deficient in ammonia, it should be replenished in time; if the liquid supply valve is not properly adjusted, the liquid supply should be opened: the valve is opened to the proper position. 2. Whether the insulation of the return air pipe is poorly insulated or damaged by moisture. The insulation should be thoroughly inspected and replaced with new insulation. 3. Inspiratory valve air leakage or rupture damage: If the air leakage is slight, the valve piece can be ground to prevent air leakage; if it is broken, replace the new suction valve piece directly. 8 Compressor suction pressure is lower than normal evaporation pressure Maintenance ideas 1. The liquid supply valve is too small to open, which may result in insufficient liquid supply, so the evaporation pressure will decrease. In this regard, it is only necessary to open the liquid supply valve to an appropriate level. 2. The valve in the suction line is not fully open or the valve core is off. If it is the former, the valve should be fully opened; if the spool is detached, the valve plug should be reinstalled. 3. The liquid ammonia in the system is lacking. Even if the pressure valve is opened, the evaporation pressure is still low. At this time, the appropriate amount of liquid ammonia should be added according to the actual situation. 4, the return air pipe is fine, or there is a "sac" phenomenon in the return air line. If the pipe diameter is too thin, the appropriate return air pipe should be replaced; if there is a "sac" phenomenon, it should be in the return air line. The “sac†section is removed and the pipe is re-welded. 9 Compressor wet stroke Maintenance ideas 1. When the compressor is started, if the suction valve is opened too fast, it will lead to the wet stroke: therefore, the suction valve should be slowly opened at the time of starting to avoid the wet stroke and damage the compressor . 2. If the opening degree of the liquid supply valve is too large, it will also cause a wet stroke. At this time, it is sufficient to close the liquid supply valve as appropriate. 3. When returning to normal temperature after defrosting in the cold storage , slowly open the inhalation valve and observe the operation of the refrigeration compressor at any time. If the return air temperature drops too fast, stop it temporarily, and wait for the operation to return to normal, then continue to open slowly. 10 Knocking sound in the crankcase Maintenance ideas 1. Check if the gap between the connecting rod big head tile and the shaft turning journal is too large. At this point, the gap should be adjusted, or the 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, and a knocking sound will occur. New tiles should be repaired or replaced. 3. Check if the split pin is broken and the connecting rod nut is loose. If yes, replace the new cotter pin and tighten the connecting rod nut. 4. If the center of the coupling is not correct or the coupling key groove is loose. The coupling or service keyway should be adjusted or replaced with a new one. 5. The main bearing steel ball is worn and the bearing frame is broken. In this case, you can replace the new bearing. 11 Cylinder wall temperature overheating Maintenance ideas 1. If the oil pump fails, the oil pressure is too low or the oil circuit is blocked: it should be stopped for comprehensive maintenance. 2. Check if the clearance between the piston and the cylinder wall is too small or the piston is deflected: at this time, the piston should be adjusted. 3. The safety block or the false cover is not tightly sealed, resulting in high and low pressure gas. Measures should be taken to repair this to improve sealing performance. 4. Check if the inhalation temperature is too high. Adjustments should be made to lower the inspiratory temperature. 5. If the quality of the lubricating oil is not good, the viscosity is too small. Replace the new lubricant with a stop. 6. Check if the scale in the cooling water jacket is too thick or the water is insufficient. If the scale is too thick, it should be removed in time; if the amount of bitter water is insufficient, the cooling water should be increased. 7. Check if the suction and exhaust valves are damaged. If it is damaged, replace the suction and exhaust valves in time. 8. Check if the piston ring is seriously worn. If so, replace the new piston ring. 12 The shaft seal leaks seriously Maintenance ideas 1. Check if the shaft package is poorly fitted, resulting in serious oil leakage of the shaft seal. The shaft seal should be assembled correctly. 2. Check if the friction surface of the moving ring and the fixing ring has been pulled. If the napping is severe, the sealing surface should be carefully ground and reassembled. 3. If the rubber seal is aging or the tightness is not properly set, it will leak oil: in this case, replace the new rubber crucible and adjust the appropriate tightness. 4. Check if the spring force of the shaft seal spring is weakened, causing the shaft seal to leak oil: the original spring should be removed and replaced with a new spring of the same size. 5. Check whether the back of the fixing ring and the shaft sealing gland are poorly sealed. In this regard, the retaining ring should be removed and the back ring cleaned and reassembled. 6. If the crankcase pressure is too high, adjust the operation. However, the crankcase pressure should be lowered before parking and the exhaust valve should be checked for leaks. 13 Shaft seal oil temperature is too high Maintenance ideas 1. Check if the lubricating oil is insufficient or the oil line is blocked. If the oil is insufficient, add oil in an appropriate amount; if the pipeline is blocked, the oil pipeline should be cleared. 2. Check if the lubricant is not clean or has deteriorated. In this case, the filter should be cleaned and replaced with new oil. 3. Check if the friction surfaces of the moving ring and the fixing ring are pressed too tightly. The spring strength of the spring should be adjusted appropriately. 4. The packing gland is too tight. The gland nut should be evenly adjusted to avoid too tight, resulting in too high a shaft seal oil temperature. 5. Check if the main bearing assembly clearance is too small. In this regard, the gap should be adjusted appropriately. Shanghai Xueyi Refrigeration Technology Development Co., Ltd .: We look forward to working with you to develop more. Please visit . Com Fungi, a large class of chlorophyll - free, can not carry out photosynthesis, heterotrophic lower class of plants. These include bacteria, slime molds and fungi. 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