An automatic control device and automatic control method for preventing low-temperature liquid shock of a refrigeration compressor

Abstract

The invention discloses an automatic control device and an automatic control method for preventing low-temperature liquid shock of a refrigeration compressor, wherein the automatic control device includes a gas-liquid separator, and the gas-liquid separator is arranged at the inlet end of an inlet pipe; There is a separator temperature sensor for the surface temperature of the collector; at the same time, an electric heating body is set on the outer wall of the intake pipe, and the electric heating body is electrically connected to the driving circuit, and the driving circuit is electrically connected to the control circuit; the control circuit also collects Suction temperature and suction pressure in the intake pipe; the control circuit compares the values ​​collected by the separator temperature sensor, suction temperature sensor and suction pressure sensor, and if any of the three values ​​is normal, There is no liquid shock phenomenon in the intake pipe, and the electric heating body does not heat to eliminate liquid shock; when the three values ​​are not normal, the control circuit controls the drive circuit to turn on, so that the electric heating body starts to heat to eliminate liquid shock. Therefore, the present invention realizes the automatic prevention of liquid shock and reduces the damage of the refrigeration compressor.

Description

technical field [0001] The invention relates to the technical field of refrigeration compressors, in particular to an automatic control device and an automatic control method for preventing low-temperature liquid shock of a refrigeration compressor. Background technique [0002] As the world's energy shortage situation is becoming more and more serious, the efficiency of energy-consuming products such as refrigeration compressors is increasingly required. The refrigeration compressor is the core equipment of refrigeration, air conditioning, chiller, heat pump and other systems, which significantly affects the energy consumption of the system. Therefore, the most direct and effective way to improve the efficiency of the system is to improve the efficiency of the refrigeration compressor. [0003] Factors affecting the efficiency of refrigeration compressors include low temperature liquid shock, which makes the actual efficiency of refrigeration compressors far lower than the ...

AI Technical Summary

Problems solved by technology

However, screw refrigeration compressors require high processing and assembly precision, and have high requirements on the lubrication system. Lubricating oil needs more auxiliary equipment such as oil pumps, oil coolers and oil recovery devices. Therefore, screw refrigeration compressors are used at a relatively low level It can keep safe under the liquid impact. Once the suction superheat is relatively small, liquid impact will definitely occur, or once the liquid impact is accumulated, it will be in an unattended failure situation. The condition deteriorates, causing the refrigeration compressor to vibrate strongly, which cannot be eliminated with the current gas-liquid separator, resulting in damage to the screw refrigeration compressor

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