The performance of the refrigerating machine oil is deteriorated. The refrigerating machine oil is waxy in the low temperature and low pressure condenser. The viscosity of the oil increases, the fluidity deteriorates, and a large amount of oil sticks to the condenser, which makes the system difficult to return oil. The compressor crankcase lacks oil, forcing the system to fail. Normal operation, the freeze-drying process is difficult to continue. In view of the above various unfavorable factors, the lyophilizer produced by a company has increased the various protection measures while ensuring the requirements of the freezing production process, and the lyophilizer has been stably operated in the secondary desorption drying stage, which greatly reduces the refrigeration. The operation of the system is faulty, resulting in a longer compressor life.
In the freeze-drying production process, the main process is to dry the solid matter frozen into ice crystals and solute, open a low-temperature liquid pipe valve drawn from the intercooler, and directly pass the expansion valve or capillary to the compressor. The medium pressure system is cooled, and at this time, the refrigerant evaporates in the medium pressure zone, thereby lowering the temperature of the exhaust port and effectively increasing the pressure of the compressor medium pressure, thereby improving the working condition of the compressor. When the freeze dryer is used at zero load and the treatment method is low, the high temperature and high pressure gas from the high pressure is mixed with the liquid sprayed by the LG type vapor-liquid mixer and the expansion valve, and then enters the condenser, thereby correspondingly improving the condenser. Temperature and pressure.
Since the time and flow rate of the mixed high-temperature and high-pressure gas can be adjusted and controlled, it has no effect on the secondary drying, but greatly improves the harsh environment of the system, so that the frozen oil in the condenser returns to the compressor in time, reducing the compression. The compression ratio of the machine, and it can not let the evaporation temperature in the condenser is too low. This method is simple and reliable after long-term use, and the system runs stably.
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