Analysis of air conditioning compressor overload protection technology

Air-conditioning compressors are susceptible to voltage and refrigeration system conditions, and compressors are prone to burnout in poor service environments. As the most expensive component of air conditioners, the protection technology of compressors has become an important issue that must be paid attention to in the field of air conditioning technology.

The most commonly used in the protection technology of the existing compressor is the current transformer or the temperature sensor detection technology. The former uses the current transformer to sense the current of the main circuit of the compressor, and the current of the compressor is used to detect the current of the compressor. When the current exceeds When setting the value, the main circuit protection compressor is disconnected by the control of the software. The current transformer can be installed in the indoor unit or the outdoor unit; the temperature sensor detection technology is to install a temperature sensor on the surface of the compressor, and by detecting the compressor The temperature protects the compressor. Since the compressor coil is inside, the temperature rise of the surface is far from the outside, and the temperature measurement error is large. In the transient overcurrent, the protection effect is not ideal. The above two technologies require single-chip control, and one or two connecting lines are required between the indoor unit and the outdoor unit, and the manufacturing cost is high.

It has been found from relevant experiments that the compressor burnout often occurs in the absence of refrigerant and in the harsh operating environment, the compressor coil temperature is related to the intake pressure and the amount of refrigerant. This paper mainly discusses the use of pressure switch as pressure detecting device under the condition that the software and hardware of the commonly used air conditioner indoor unit are unchanged, adding a detected electronic control board in the idle space of the outdoor unit, and detecting the pressure of the compressor. Achieve overload protection of the compressor. With this solution, it is not necessary to change the original circuit of the air conditioner, and it is extremely versatile, and can be applied to different types of air conditioners, and the indoor unit does not need to be changed.

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