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Supermarket refrigerated showcase refrigeration failures and maintenance methods (3)
author: supermarket refrigerated showcase category: commercial refrigeration Views: 772Time: 2016-08-22
supermarket refrigerated showcase refrigeration failures and maintenance methods (3)
poor refrigeration and oil stains at the root of the compressor nozzle. Failure phenomenon: poor cooling, black mush at the root of a compressor nozzle Oily. Fault analysis: 80% of the oil stains are leaking points, causing refrigerant leakage, and very few other refrigeration pipelines or compressors have poor exhaust performance. Troubleshooting: Unplug the supermarket refrigerated showcase power supply, turn on the compressor process tube to vent, and check the system for leaks. There may be the following four situations.
①The compressor process tube discharges a small amount of gas, the total pressure is 0.8MPa, and soap is applied to the oil stains, there are bubbles. This shows that there are indeed leaks in the oil stains. Repair the compressor oil stains, but take cooling measures when repairing. Remove the compressor, use a saw blade to polish the leaking spot and place it in a basin, but the water should not exceed the leaking spot. Repair and seal the leaking point. Keep in mind that the heating time should be as short as possible when repairing, and it is best to succeed in one welding, because multiple welding may weld the roots or cause oxidation of the non-stick solder, increasing the amount of repair or scrap rate.
②The compressor process tube discharges less gas, the total pressure is 0.8MPa, and soapy water is applied to the oil stain at the root of the compressor without bubbles. At this time, the compressor is individually pressured to 1.2MPa, and then soapy water is used to check the oil stains and the roots of the nozzles and the joints of the upper and lower shells for leakage. If there is no air bubbles, the pressure must be maintained for 24 hours to further determine the tightness of the compressor.
③The compressor process tube discharge gas volume is less than the total pressure, supermarket refrigerated showcase compressor check the compressor without leaks. In addition to repair welding on the compressor oil stains, the high and low pressure pipelines should be pressured and leaked in sections.
④The compressor process tube discharges a large amount of gas. Check the compressor exhaust performance first, that is, weld the compressor exhaust pipe (thin) nozzle, plug in the power to make the compressor run, press the exhaust pipe with your thumb, if it is easy to block, judge the compressor If the exhaust performance is poor, the compressor of the same size should be replaced. After finding the fault point of the system and repairing it, blow through the system with nitrogen, replace the dry filter, evacuate, fill with refrigerant, and seal. [Note] As long as the compressor is not replaced, repair welding should be performed on the oily part, regardless of whether the leaking point is found in the oily part of the compressor.
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