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Kelly|Technology temperature analysis of common problems in refrigeration...
1. What are the causes and treatments for excessive exhaust gas temperature or oil temperature?
Answer: (1) The compression ratio is too large; the suction and exhaust pressures are detected, and the pressure ratio is lowered.
(2) cooling effect of water-cooled oil coolers; cleaning oil coolers, reducing water temperature or increasing water volume.
(3) Insufficient liquid supply of liquid ammonia oil cooler; analyze the cause and increase the liquid supply.
(4) Inhale severely overheated steam; increase the liquid supply, strengthen the suction line insulation, and check whether the bypass valve leaks.
(5) Insufficient fuel injection; check and analyze the cause and increase the fuel injection amount.
(6) The system infiltrates the air; it should be discharged, and the cause of the air infiltration should be checked for maintenance.
2, (screw machine) exhaust gas temperature or oil temperature drop causes and treatment?
Answer: (1) Inhaling wet steam or liquid refrigerant; reducing the amount of liquid supplied to the evaporation system.
(2) continuous no-load operation; check the slide valve.
(3) The exhaust pressure is abnormally low; the water supply is reduced or the number of condensers is reduced.
3. (Roller) The reason why the slide valve is not flexible or does not work and how to deal with it?
Answer: (1) The four-way reversing valve or solenoid valve is not flexible; check the four-way reversing valve or solenoid valve coil and wiring.
(2) The oil pipeline system is blocked; overhaul.
(3) The oil piston is stuck or leaking; repair the oil piston or replace the seal.
(4) The oil pressure is too low; overhaul and adjust the oil pressure.
(5) The slide valve or guide key is stuck; overhaul.
4. Why is the temperature of the screw compressor body too high and the treatment method?
Answer: (1) The moving parts have abnormal wear; repair the compressor and replace the damaged parts.
(2) Inspiratory severe overheating; reduce inhalation superheat.
(3) Leakage in the bypass line; check whether the drive or stop bypass valve leaks.
(4) The compression ratio is too large; the suction and exhaust pressures are detected, and the pressure ratio is lowered.
5. Causes and treatment of leakage of compressor and oil pump shaft seals?
Answer: (1) Damage to the seal ring caused by insufficient oil supply to the shaft seal; overhaul, check the oil circuit and adjust the oil pressure.
(2) "O" ring deformation or damage; replacement.
(3) Poor assembly; dismantling and repairing.
(4) The static and dynamic ring contact is not tight; remove and re-grind.
(5) The oil has impurities to wear the sealing surface and the refrigerant liquid in the oil is too much; check the essential oil filter to ensure the oil supply temperature.
6. Why are the oil pressure too low and how to deal with it?
Answer: (1) The oil pressure regulating valve is improperly adjusted; re-adjust the oil pressure regulating valve.
(2) The internal discharge of the compressor is large; check and repair.
(3) The oil temperature is too high; check the oil cooler to eliminate the factors that affect the heat transfer capacity.
(4) Inferior oil quality, insufficient oil; oil change, fueling.
(5) Oil pump wear or failure; overhaul.
(6) The oil is thick and the fine filter is dirty; the filter element is cleaned.
(7) The oil contains more refrigerant; stop and heat the oil.
7. What are the reasons for the increase in fuel consumption of the compressor and how to deal with it?
Answer: (1) The oil separator's oil separation efficiency is reduced; the oil separator is repaired.
(2) There is too much oil in the oil separator, the oil level is too high; the oil is drained and the oil level is controlled.
(3) Exhaust gas temperature is too high, the efficiency of the oil separator is reduced; oil cooling is enhanced to reduce the exhaust gas temperature.
(4) The oil pressure is too high, the fuel injection amount is too much, and the compressor is returned to the liquid; the oil pressure is adjusted or the compressor is repaired, and the compressor is returned to the liquid.
(5) The oil return line is blocked; overhaul.
8. What are the reasons for the oil level rise of the oil separator and how to deal with it?
Answer: (1) The oil in the system returns to the compressor; release too much oil.
(2) Excess refrigerant enters the refrigeration oil; raises the oil temperature and accelerates the evaporation of the refrigerant dissolved in the oil.
(3) The oil separator oil return line is blocked; overhaul.
(4) The vertical oil separator liquid level gauge has a condensed refrigerant liquid; at this time, the liquid level height may be untrue, and the actual oil level height should be estimated.
9. Reasons for the reversal of the compressor when the screw compressor is stopped and how to deal with it?
Answer: (1) The suction and exhaust check valves are not closed tightly; overhaul and eliminate the valve plate jam.
(2) Prevent the reversed bypass line valve from opening in time; check and repair.
10. Why are the inhalation temperature too low and how to deal with it?
Answer: (1) Excessive refrigerant in the evaporator, gas-liquid separator or low-pressure circulation tank; adjust the liquid supply valve to stop or reduce the liquid supply, and even discharge excess refrigerant to the drain tank.
(2) The heat exchange efficiency of the evaporator is lowered; the evaporator is cleaned or the oil is drained.
11. How is the refrigeration equipment safety protection value specified?
Answer: The refrigeration equipment safety protection value is as specified in the product instruction manual. The safety protection values of LG series screw refrigeration compressors are as follows (reference):
(1) high injection temperature protection: 65 ° C (down);
(2) Low suction pressure protection: -0.03Mpa (stop), this value can be modified;
(3) High exhaust pressure protection: 1.57Mpa (stop);
(4) High pressure difference of essential oil filter: 0.1Mpa (stop);
(5) Main motor overload protection (protection value according to the motor requirements);
(6) Low pressure difference between oil pressure and exhaust pressure: 0.1Mpa (stop);
(7) Oil pump overload protection (protection value according to the motor requirements);
(8) The chiller, brine unit and ethylene glycol unit have low water temperature protection, and the evaporator and condenser are protected from water.
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Pump common faults and solutions