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Common failures of half-sealed piston compressors

Common failures of half-sealed piston compressors 1. The compressor cannot start normally 1. First check whether the power supply voltage is too low or the motor line is poorly connected. If the grid voltage is too low, start again after the grid voltage returns to normal; if it is a poor line contact, the line and the motor should be detected. And repair it. 2. Check whether the exhaust valve is leaking. If the exhaust valve is damaged or the seal is leaking tightly, it will cause the pressure in the crankcase to be too high, which can not start normally. Need to replace the exhaust valve and sealing line. 3. Check whether 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 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. Repair the pressure relay and reset the pressure parameters. 2. No oil pressure check 1. Check the oil pump pipeline system for leaks or blockages. 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. 2. Check whether the oil pump is seriously worn, and the gap is too large, which prevents the oil pressure from rising. In this case, the oil pump should be repaired, and it should be replaced directly when the fault is serious. 3. A large amount of foam is generated in the crankcase 1. A large amount of refrigerant is mixed in the lubricating oil. When the pressure decreases, the refrigerant will evaporate seriously and produce a lot 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 line. . Fourth, the oil temperature is too high 1. 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. 2. The shaft seal friction ring is installed too tight 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. 3. If it is caused by the high suction and discharge temperature of the compressor, the system's liquid supply valve should be adjusted appropriately to restore the suction and discharge 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. 3. Too much refrigerant enters the crankcase, which causes pressure to rise after evaporation. Just evacuate too much refrigerant in the crankcase. 6. 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 open. 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. 7. Wet stroke of compressor 1. A large amount of wet steam is sucked in when the compressor is started, which 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 the cold storage returns to normal temperature after defrosting, the suction valve should be opened slowly, and the operation of the refrigeration compressor should be observed 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. 8. Overheating of the cylinder wall temperature 1. The oil pump malfunctions, causing the oil pressure to be too low or the oil circuit to be blocked, so the machine should be shut down for full maintenance. 2. Check whether the suction temperature is too high. Adjustments should be made to lower the suction temperature. If the quality of the lubricant is not good, the viscosity is too small. Should be shut down and replaced with new lubricants. 3. Check whether the suction valve and exhaust valve are damaged. If damaged, the suction and exhaust valve should be replaced in time. Check whether the piston ring is severely worn. Refrigeration copper pipe piping maintenance and welding operation The harm of copper oxide scale and case analysis

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