8-73 What is liquid compression? How to prevent liquid compression in the dryer?

Answer: Liquid compression means that when the working fluid in the compressor reaches the critical temperature under the current pressure, part of it will become liquid. These droplets will enter the compressor with the working fluid and hit the blades, causing damage to the blades. The reason for liquid compression is that there is too much refrigerant liquid entering the evaporator or the evaporation pressure is too low, and the refrigerant liquid is sucked into the compressor.

In order to prevent liquid compression in the compressor, the following measures can be taken:

• When filling the refrigerant, strictly control the filling amount;
• Install a hot gas bypass valve between the condenser and the evaporator or between the condenser and the compressor suction port to ensure that there is no liquid refrigerant accumulation in the evaporator or suction pipeline;

③ Set a liquid receiver or regenerator upstream of the compressor suction pipe to ensure that only gaseous refrigerant is allowed to enter the compressor.