Food freeze dryer maintenance and repair

　　We all know clearly that the maintenance and repair of food freeze dryers is composed of two parts: the refrigeration system and the vacuum system. The principle is that when the items to be added are placed in a low-temperature vacuum environment, the water contained therein is frozen into ice. The ice sublimates into water vapor under low pressure and is pumped out by the vacuum pump, thereby drying the items to be processed. Then we can come to the conclusion that the refrigeration system and vacuum system are the brains of food freeze dryer maintenance and repair. As long as there is a problem with one of them, it will not function and work properly. Therefore, the daily maintenance of the freeze dryer is very important. Therefore, we need to perform regular maintenance and repairs on the food freeze dryer, so this time we will further explain the maintenance work of these two systems.

　　1. Maintenance of refrigeration system

　　The refrigeration system of the freeze dryer is mainly composed of a compressor, expansion valve, water-cooled condenser, evaporator, oil separator, gas-liquid separator, solenoid valve, hand valve, pressure gauge, pressure controller, drying filter, etc.

　　The main contents of daily maintenance are as follows:

　　1. Daily routine inspection. The main inspection contents include:

　　2. Whether all valves that should be opened are open.

　　3. Check whether the compressor pressure is within the normal range.

　　4. Are the pressure and temperature of the cooling water normal?

　　5. Whether the compressor oil return and oil level are normal.

　　6. Whether the compressor operation sound is normal.

　　7. Whether there is abnormal vibration in the refrigeration pipeline.

　　8. Frosting of the compressor and expansion valve, etc.

　　9. If any abnormality is found during the inspection, the cause should be found out and handled in time to eliminate potential accidents.

　　10. When the equipment is not used for a long time, the refrigerant should be collected into the condenser to prevent refrigerant leakage. During the production process, the refrigeration system should be checked for leaks frequently to ensure that leaks are discovered and dealt with promptly. If the refrigerant is insufficient, it should be filled in time to avoid affecting the normal operation of the equipment.

　　2. Maintenance of vacuum system

　　The vacuum system is mainly composed of a vacuum pump, a front box, a back box, valves on the box, mushroom valves, small butterfly valves, vacuum silicon tubes, etc.

　　1. Replace the vacuum pump oil regularly to ensure the performance of the vacuum pump.

　　2. Before starting the vacuum pump, check whether the oil level is normal (it should be about 1/2 of the oil sight glass).

　　3. Before vacuuming the box, make sure the back box is dry to avoid drawing water vapor into the pump body, which will affect the pumping efficiency of the vacuum pump.

　　4. Nowadays, freeze dryers are used for drying in many fields. As a new drying method, there is no doubt that the drying effect of food freeze dryers is the best. Because of the retention of the ingredients of the material, as well as the effect of later preservation and rehydration, freeze drying can achieve almost perfect retention of the original material properties.

　　5. Food freeze dryer maintenance and repair mainly consists of electronic control system, refrigeration system, vacuum system and some spare parts. Below we will first talk about some maintenance of the vacuum system:

　　6. The vacuum system is one of the important components of the maintenance and repair of the food freeze dryer. It generally includes a rotary vane vacuum pump or a dry pump and a Roots pump to accelerate vacuuming.

　　7. Last time I talked about the inspection of the vacuum pump during operation. This time I will explain the inspection and maintenance of the vacuum system of the freeze dryer that has been out of operation for a long time.

　　三、真空泵的维护保养

　　1、如果泵在一段时间内不使用，应关闭电源和冷却水供应;

　　2、如果泵在冻干工艺结束后直接关闭，水汽可能残存在泵体内。如果泵长期处于关闭状态，这些液体可能会腐蚀泵的机械结构，可能会造成泵无法再启动。建议泵在调试结束后空转半小时左右。

　　3、泵头阀在真空泵开启时同时得电，真空泵停止时断电;

　　4、泵头阀有无得电可从阀尾端的进气口处判断。把消声器拆下，用手堵住进气口，有气往里吸证明阀没得电，反之得电;

　　5、关闭真空泵切断泵头阀电源，通过真空管上的硅管真空度变化来判断泵头阀是否关闭的严。

　　关于食品冻干机保养维修我们就简单的介绍到这里，如需更多的了解相关信息请联系我们的工作人员。

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