Full analysis of high-temperature burn-down failure of scroll compressor Scroll compressor overheating at high temperature for a long time will not only reduce the insulation performance and reliability of the motor, shorten the life of the motor, but also reduce the lubricating ability of the lubricating oil, and even cause carbonization and acid hydrolysis of the lubricating oil. Lubricating oil after acid hydrolysis will cause copper plating phenomenon, Hitachi cold storage compressor 10p, fine metal scraps caused by wear after copper plating are mixed in lubricating oil, on the one hand weaken the lubricating effect of lubricating oil, on the other hand, small metal The debris gathers in the motor windings due to magnetism, forming a conductive loop, causing partial discharge or coil short circuit.
Scroll compressor high temperature burnout failure performance: exhaust or top temperature protection, press chamber temperature is too high, high pressure protection (when the system is blocked), current protection or open tripping, etc. Cause Analysis: 1. Too little refrigerant addition or refrigerant leakage causes the exhaust gas temperature to be too high. 2. Dirty or ice blockage of the system (ice blockage mainly refers to the return air pipe), which leads to excessive exhaust or top temperature. 3. The vacuum of the system is not enough, the compressor compresses the air, the pressure ratio is too large, and the temperature is too high. 4. The operating environment of the system is bad, the air duct is blocked, the return air is poor, the heat exchanger is dirty, etc., resulting in high condensing pressure and the exhaust temperature continues to rise. 5. If the connecting pipe is too long or the pipe diameter is too small, the system resistance will increase, resulting in an increase in exhaust temperature and pressure. The above is the analysis of the cause of the failure of the scroll compressor at high temperature and the explanation of the burning process Advantages of electronic expansion valve closing when the Hitachi air-conditioning compressor is shut down When the electronic expansion valve is shut down, the valve is fully closed to prevent refrigerant from flowing from the condenser to the evaporator; when the Hitachi air-conditioning compressor is started, first Control the electronic expansion to turn on, so that the suction and exhaust pressures quickly reach a balance, and then control the compressor to start, which not only reduces heat loss, but also makes Hitachi air-conditioning compressor easy to start.
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How to directly judge the failure of the air-conditioning compressor? How to directly judge the failure of the air-conditioning compressor? Many refrigeration personnel want to know. The editor of Jiaxing Yulong has compiled some phenomena about the failure of the air-conditioning compressor on the Internet. Through these phenomena, the failure of the compressor and the cause of the failure can be directly judged, and the problem can be solved in time. First, the failure phenomenon is: the compressor does not run after power-on, and the protector operates. It is usually caused by the compressor losing oil or impurities entering the shaft or stuck cylinder failure. Second, the failure phenomenon is: the suction and exhaust valves of the compressor are damaged, the compressor, the system is not cooled or the cooling effect is very poor. Normally, the air conditioning compressor suction and exhaust valves are not closed properly. Third, the failure phenomena are: the collision between the pipeline and the casing, the loosening of the fixing bolts of the compressor, and the shedding of the damping block. Such problems often occur during maintenance work and generally do not have much impact on refrigeration performance. Fourth, the fault phenomenon is: open circuit or operating temperature point becomes smaller. This problem is often confused with a slight short circuit between winding turns. The difference is that the working current is normal when the thermal protector is damaged, and the current is too large when the winding is shorted. Usually it is the failure of the thermal protector of the air conditioner compressor. Fifth, the fault phenomenon is: the power supply is normal when the circuit is broken, and the compressor does not work; the protector acts or the fuse is burned after being energized when the short circuit and the shell are touched. Usually it is the air conditioner compressor short circuit, open circuit and the winding touches the chassis ground fault, so it is not easy to judge, and it should be judged according to the measured current. By describing the fault phenomenon of the air conditioner compressor, the fault of the air conditioner compressor can be directly judged, and the complicated troubleshooting work can be avoided, which not only saves time, but also solves the problem quickly, so as to achieve a multiplier effect. Little friends who don't know yet, learn it now!
