Unmanned vending machine|Introduction of fault-related knowledge

Unmanned vending machine: The unmanned vending machine in the supermarket is not cooling. First, we have to turn on the electricity to listen to the sound, make sure that the compressor is running, and open the door of the refrigerator room. The sound is crisp and gurgling, indicating that it is inside. There may be no refrigerant, it may be a high-pressure leak; what is the hissing sound, touch the capillary again to get the outlet, it is a little cold, it means there is still a little refrigerant, it may be a low-pressure leak. All of the above are still preliminary for the unmanned vending machine to be turned off. The specific determination must be based on the pressure and filter status. After listening to the sound, the machine will stop, and the process tube will be opened after 15 to 20 minutes. The ice is blocked until the ice melts. When the tube is opened, the cutting knife is cut in half. Take a leak-proof plastic bag to wrap the cutting knife and the process tube, and then fold it down by hand. At this time, you can know the pressure in the system: negative pressure? zero pressure? positive pressure A small amount of refrigerant is still a positive pressure large amount of refrigerant. If the unmanned vending machine has a hissing noise and a little bit of cold at first, it will still be cooled in a few days or even a month, but eventually it will not be cooled, there will be a compressor running sound, it is very muffled, and there is no other sound, you can be sure that it is If the ice is blocked, it can be refrigerated after stopping the machine to melt the ice. When the unmanned vending machine confirms that the frozen exposed pipe is not leaking, it is cold storage or temperature change. The unmanned vending machine has gurgling and beeping noises. You can check whether there is any trace of water flowing at the door of the unmanned vending machine. The middle door cabinet Is there any rust? If it is, it can be concluded that it is a high-pressure leak. At this time, the door tube can be found and the door tube can be thrown directly, and the external condenser can not be found. The door frame is rusty and most of the refrigerated outlet pipe freezes. If there is an open back, the drain pipe should be treated. Lift it up to the back plate position. The foam should be dug out and the leak is glued. Scrape the door frame and apply glue on it.　　 Negative pressure, combined with the beeping sound heard before, can confirm that it is a high pressure leak. The positive pressure must be combined with the filter status. Zero pressure is more troublesome, and high and low pressure leakage may occur. It can only be determined by combining the filter status. The positive pressure is too large to determine whether the compressor discharge is normal. Generally, you can’t hold it with your thumb, and you can judge that the compressor is okay.　　Whether the unmanned vending machine uses copper pipes, iron pipes, aluminum pipes or composite pipes, it will not leak in a dry environment without water. No matter how good the insulation material of the unmanned vending machine is, there will be some water in the position of the refrigerated pipeline for a few years. The water in the foam layer of the refrigerated room is between liquid and solid. The vending machine gets water in the foam of the freezing layer because it freezes. Iron pipes rust when exposed to water, and the same is true for copper pipes whose walls are thin. If there is more water, rust may wear out. The aluminum tube itself is not easy to be hydrolyzed, but now the aluminum tube is used in the unmanned vending machine or the capillary and the aluminum tube are connected in the cold room. The middle section of the capillary tube and the aluminum tube must be wrapped together for heat exchange. The capillary tube will have heat. Even if the heat exchange site is in the frozen layer, the water is still in a liquid state. The position where copper and aluminum are in contact will produce ionization reaction in the presence of liquid water, causing the aluminum tube to be corroded. Therefore, as long as there is a leak in the refrigeration or return air part of the pipeline, there is water involved. When the leakage to the purple point is negative when the machine is turned on, the water will definitely be sucked into the system and stay in the filter. The filter of the unmanned vending machine has to open the back or replace the tube if there is water, and there is no water in the filter when the pressure is zero. Generally, the door tube is very rusty and the perforation is large. You only need to remove the door tube or external condensation. The device is fine.
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