The working principle of the freeze dryer: freeze dryer (abbreviation: cold dryer) The cold dryer mainly adopts the working principle of cooling and condensation, one of the drying equipment for air compression drying; the cold dryer is mainly composed of a heat exchange system and a refrigeration system It is composed of three systems of electrical control system; the compressed air coming out of the air compressor is hot, humid and contains water, and the air to the air heat exchanger is initially cooled; then the pre-cooled air is cooled by the air to the refrigerant heat exchanger The refrigerant circulation circuit of the cold dryer is further cooled and exchanges heat with the cold air that has come out of the evaporator and is cooled to the pressure dew point, which further reduces the temperature of the compressed air. Then the compressed air enters the evaporator and exchanges heat with the refrigerant. The temperature of the compressed air drops to O ℃ ～ 8 ~ C, the water in the air is precipitated at this temperature, and the moisture oil condensed in the compressed air is passed through the condenser Separated from impurities and discharged out of the machine through an automatic drain. The dry low-temperature air enters the air to exchange heat with the air exchanger, and the output is increased after the temperature rises. It can effectively prevent the occurrence of dew condensation in the pipeline. The bypass valve can automatically adjust the cold coal according to the requirements of load changes. Throughput. Common faults of freeze dryer: After starting up, after a period of time, the colored segment on the pressure dew point indicator can be displayed in the green segment or in the red segment. Failure analysis of freeze dryer: Red segment-Overhaul 1 The colored segment on the pressure dew point indicator is displayed in the red segment. This indicates that the pressure dew point is too high. Under normal circumstances, it should be in the green section, the pressure dew point is too high. Causes of failure: ①The thermal protection switch is malfunctioning or damaged; ② The compressor starter is broken or the coil is broken; ③ Leakage or blockage of refrigerant in the refrigeration system; ④ The condenser fan does not rotate, and the temperature is too high to cause the compressor to start protection; Eliminate the cause of the failure one by one: ①Remove the thermal protection switch to measure. It is found that the switch has popped up. After pressing it, there is no abnormality in the measurement. Put it in the oven and heat it. Take out the measurement control contact and it can be disconnected. ② Turn on the compressor starter and measure the resistance of the starter and the coil with a multimeter Rxl ohm file. The resistance of the starter is zero, and the coil resistance is tens of ohms, and there is no abnormality; ③ Restore the thermal protection switch and compressor starter, and start the compressor to work. Observe that the temperature of the condenser is heated and the frost on the evaporator indicates that the refrigerant in the refrigeration system has not leaked or blocked: ④ Remove the condenser fan, connect to 220V power supply, it can be turned, but sometimes it does not turn, the measurement found that the fan power supply is normal, and the coil of the motor is not broken, then it may be because the last time the dryer was flooded, there was no Replace the bearing, so replace the bearing, restore the machine, and turn it on. After a period of time, the colored segment on the pressure dew point indicator is displayed in the green segment, and the whole machine returns to normal. Another kind of failure: It is normal after starting up, but it will not be normal after a while. It is the same after several attempts. Analyze the compressor, condenser fan, protection switch and refrigeration system. Sub-refrigerant leakage, it is relatively simple to deal with the failure of refrigerant leakage, so I won't say much here. If you choose a freeze dryer, go to Shanghai Bilang Instrument Manufacturing Co., Ltd. Zipper Purse,Mini Purse,Functional Mini Purse,Coin Wallet,Shopping bag Dongguan Jinying Handbags Co.,Ltd , http://www.jinyingbeautybag.com