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When the pressure in the high pressure chamber of the compressor reaches 180, the casing begins to undergo expansion deformation. When the compressor is compressed, such high pressure cannot be achieved due to motor torque limitation. Therefore, there may be abnormal physical and chemical changes in the compressor machine resulting in high pressure. The compressor continues to compress the refrigerant, and the exhaust temperature rises rapidly; at the same time, the exhaust pressure rises rapidly, the compression ratio increases, the motor power increases, and the heat generated by the motor increases; as the cylinder pressure difference increases, the motor load increases to a certain value. After that, the motor stalls, the compression stops, and the protector does not jump due to the delayed action relationship, the power supply is not disconnected, the motor coil is heated, and the heat generated by the motor is further increased. Due to the high temperature and high pressure in the cavity, R22 is in thermal contact with the metal material and the insulating material of the refrigerating machine oil to generate a flammable gas, which is mixed with air. At this time, the insulation performance of the motor has been significantly reduced. If the power failure is not dealt with in time, the large current in the stall state is prone to sparks and an explosion occurs immediately.
Although the power is turned off in time, the capillary is subsequently removed. Since the V is reversed, the refrigerant must be slowly discharged (to prevent the compressor from being discharged), and the refrigerant can only be partially discharged. There are still many refrigerants, oils and even some flammable explosive gases in the cavity. In addition, air compression, temperature rise, current increase, in the case of motor insulation has been reduced, it is easy to generate electric sparks and air-conditioning rotary compressor expansion deformation investigation and analysis lead to explosion. The compressor motor self-protection adopts a direct disconnect type built-in protector, which is a temperature-current type protector, which is placed between the main and auxiliary windings of the motor to sense the temperature of the motor; at the same time, it is connected to the common end of the power supply and flows through the motor. All current. It quickly detects overload current and overheat current, then disconnects the circuit and protects the motor.
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