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Common failure causes of half-sealed piston compressor

Common failure causes of half-sealed piston compressor 1. The compressor cannot start normally 1. First check whether it is caused by too low power supply voltage or poor connection of the motor line: if the grid voltage is indeed too low, start again after the grid voltage returns to normal; if the line is not in good contact, the line should be detected And repair it. 2. Check whether the exhaust valve is leaking: If the exhaust valve is damaged or the leak is not tight, the pressure in the crankcase will be too high, which will prevent the normal start. Need to replace the exhaust valve and sealing line. 3. Check whether the energy adjustment 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 replaced. 5.Check whether the pressure relay is malfunctioning: overhaul the pressure relay and reset the pressure parameters. 2. No oil pressure 1. Check whether there is oil leakage or oil leakage at the connection of the oil pump pipeline system. If the connection is loose, the joint should be tightened; if it is blocked, the oil pipeline should be dredged. 2. Whether it is caused by the opening of the hydraulic pressure regulating valve or the spool falling off. If the hydraulic pressure regulating valve is improperly adjusted, the hydraulic pressure regulating valve should be adjusted, and the hydraulic pressure should be adjusted to the required value; if the valve core falls off, the valve core must be reinstalled and tightened firmly. 3. If there is too little oil in the crankcase or there is refrigerant, it will cause the oil pump not to enter the oil. If there is too little oil, it should be refueled in time; if it is the latter, it should be shut down in time to eliminate the refrigerant. 4. The oil pump is severely worn and the gap is too large, causing the oil pressure to not come up. In this case, the oil pump should be repaired, and it should be replaced directly when the fault is serious. 5. Check whether the connecting rod bearing, main bearing, connecting rod bush and piston pin have been severely worn. At this time, relevant parts should be replaced in time.6. The gasket of the rear cover 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. 3. A large amount of foam is generated in the crankcase 6. 7.The liquid foaming of the lubricating oil in the crankcase occurred due to the following two reasons: 1. A large amount of refrigerant is mixed in the lubricating oil. When the pressure decreases, the refrigerant will evaporate and produce a large amount of foam. For this, the refrigerant in the crankcase should be evacuated. 2. Too much lubricating oil is 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 level . 4. The oil temperature is too high 1. Improper assembly of shaft and tile, 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. 8. 2. The impurities in the lubricating oil cause the bearing bush to be rough. In this regard, the brushed bearing bush should be scraped flat and replaced with new oil; if the tile is heavily brushed, a new tile should be replaced. 3. The shaft seal friction ring is installed too tightly or the friction ring is rough. The friction ring of the shaft seal should be readjusted; if the friction ring is badly shaved, a new friction ring should be replaced. 4. If the suction and exhaust temperature of the compressor is too high, the system's liquid supply valve should be adjusted appropriately to restore the suction and exhaust temperature to normal. 5. The pressure in the crankcase rises 1. The piston ring is not tightly sealed, which causes high pressure to low pressure gas. A new piston seal ring should be replaced. 2. The exhaust valve is not closed tightly, causing the pressure in the crankcase to increase. The sealing of the exhaust valve disc seat should be checked. If the seal is not tight, a new valve disc should be replaced 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 reassembled. 4. Too much refrigerant enters the crankcase, which causes the pressure to increase after evaporation. Just evacuate too much refrigerant in the crankcase. 6. Failure of energy regulation mechanism 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. The oil piston should be removed for cleaning and the dirty oil should be replaced, and then re-assembled 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 pull 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 necessary, readjust the oil distribution valve. 7. Excessive waste heat 1. Check whether the ammonia in the evaporator is too low 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 improperly adjusted, the liquid supply valve should be opened to a suitable position. 2. Whether it is bad insulation of the return air pipeline insulation layer or damaged by moisture. The insulation layer should be thoroughly inspected and replaced with new insulation materials. 3. The air of the suction valve is leaking or damaged. If the leakage is slight, you can grind the valve disc to make it no longer leak; if it is broken, replace the new suction valve directly. 8. The compressor suction pressure is lower than the normal evaporation pressure 1. The opening of the liquid supply valve is too small, which may result in insufficient liquid supply. Therefore, the evaporation pressure will drop. In this regard, as long as the liquid supply valve is opened to an appropriate degree. 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. The refrigerant in the system is lacking, even if the large pressure valve is opened, the evaporation pressure is still low. At this time, an appropriate amount of refrigerant should be added according to the actual situation. 4. The return air pipeline is thin, or there is a "liquid sac" phenomenon in the return air pipeline. If the pipe diameter is too small, the appropriate return air pipe should be replaced; if there is a "liquid bladder" phenomenon, the "liquid bladder" section of the return air pipe should be removed and the pipe re-welded. Nine, compressor wet stroke 1. When the compressor starts, if the suction valve opens too fast, it will cause a 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, it is sufficient to close the liquid supply valve appropriately. 3. When returning to normal temperature after defrosting in the cold storage, you should slowly open the suction valve and observe the operation of the refrigeration compressor at any time. If the return air temperature drops too fast, it should be temporarily turned off, and when the operation returns to normal, then continue to slowly turn on. 10. There is a knocking sound in the crankcase 1. Check whether the gap between the connecting rod big head tile and the shaft turning journal is too large. At this time, 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 whether the cotter pin is broken and the connecting rod nut is loose. If yes, replace the cotter pin with a new one and tighten the connecting rod nut. 4. If the center of the coupling is not correct 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. 11. Serious oil leakage of shaft seal 1. Check whether the shaft seal is poorly matched, 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 roughness is serious, the sealing surface should be carefully ground and reassembled. 3. If the rubber sealing ring is aged or the tightness is not set properly, oil leakage will occur. In this regard, a new rubber seal should be replaced and the proper tightness adjusted. 4. Check whether the spring force of the shaft seal spring is weakened, which causes 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 tightness of the back of the fixing ring and the shaft seal gland has deteriorated. In this regard, the fixing ring should be removed, and the back ring should be cleaned and reassembled. 6. If the crankcase pressure is too high, it should be adjusted. But before stopping, the pressure of the crankcase should be reduced and the exhaust valve should be checked for leaks. 12. Overheated cylinder wall temperature 1. If the oil pump fails, the oil pressure is too low or the oil circuit is blocked, it should be shut down for full maintenance. 2. Check whether the gap between the piston and the cylinder wall is too small or the piston is misaligned. For this, the piston should be adjusted or replaced. 3. The safety block or false cover is not tightly sealed, causing high and low pressure gas. In this regard, measures should be taken to repair to improve the sealing performance. 4. Check if the suction temperature is too high. Adjustments should be made to lower the suction temperature. 5. If the quality of the lubricant 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 water is insufficient, the amount of cooling water should be increased. 7. Check whether the suction valve and exhaust valve are damaged. If damaged, the suction and exhaust valve should be replaced in time. 8. Check whether the piston ring has been seriously worn. If yes, replace with a new piston ring

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