Refrigeration compressors operating under such harsh conditions are bound to bring various disadvantages. In the freeze-drying production process, the main process is to dry the solid matter frozen into ice crystals and solute, and the drying process can be divided into two processes. The first drying is also called sublimation drying process. Because of its large load, the temperature inside the condenser is relatively high, generally at 45 to 5 °C, the freezing system works basically normal, and the failure is less. In the process of entering the secondary drying process, it is also called the analytical drying stage, so that the lyophilizer can be stably operated in the secondary desorption drying stage, which greatly reduces the operation failure of the refrigeration system and makes the service life of the compressor longer. Due to the small system load, almost zero, the condenser temperature will drop below 60 ° C, and it needs to run continuously for more than ten hours in this state. At this stage, the refrigeration system has a small amount of refrigerant evaporation, and the compressor suction pressure is low. There are many problems in the operation of the system.
Increasing the compression ratio by 1 will reduce the gas transmission coefficient of the compressor and reduce the gas volume, resulting in a decrease in cooling capacity. 2 The exhaust temperature of the compressor will rise, the temperature of the cylinder will rise, affecting the lubrication of the moving parts of the machine, which may cause the carbonization of the refrigerating machine oil, resulting in the performance of the vulnerable parts such as piston rings, cylinder liners and valves. Constantly decreasing, and carbon-bound oil can cause system blockage. 3 The loss caused by the throttling of the liquid refrigerant is increased, and the steam generated after the throttling increases, so that the unit cooling capacity is reduced and the cycle cooling coefficient is lowered. 4 The compressor clearance volume will be re-expanded, the efficiency will decrease, and the efficiency curve will be flat.
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