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    Analysis of common problems in the process of suction and discharge of refrigeration compressors

    Analysis of common problems in the process of suction and discharge of refrigeration compressors Refrigeration compressor is the core and heart part of the refrigeration system, and is widely used in the industrial refrigeration field such as medicine and food. At present, with the continuous expansion of the refrigeration market, the future development space of refrigeration compressors is also huge. In the process of using refrigeration compressors, some problems are often encountered Inhalation problems 　　 The suction problem of refrigeration compressors mainly includes the situation where the suction temperature is too high or too low. 　　 Among them, the main reason for the high suction temperature is generally caused by the insufficient refrigerant charge in the system, the expansion valve opening is too small, the expansion valve port filter clogged and other reasons. 　　 The suction temperature is too low, it is mainly due to the large amount of liquid supplied by the evaporator, resulting in low suction superheat. Excessive refrigerant charge and excessive expansion valve opening can cause the suction temperature to be too low. In addition, due to external reasons, the refrigerant will cause severe frosting when the evaporator is insufficiently evaporated or not evaporated, and even causes wet compression, and the temperature of the exhaust gas may also be very low. 　　Exhaust problem 　　 The discharge problems of refrigeration compressors mainly include high discharge temperature, high or low discharge pressure, etc. 　　 The main reasons for the high exhaust temperature include the high intake temperature and the high exhaust temperature. In addition, the increase in the condensation temperature and the crushing of the exhaust valve will also cause the exhaust temperature to increase. According to the industry, the actual factors that affect the increase in exhaust temperature include: low intercooling efficiency or excessive scale in the intercooler affects heat exchange, resulting in a higher intake temperature and an increase in exhaust temperature; Leakage of the piston ring not only affects the temperature of the exhaust gas, but also changes the pressure between the stages; the lack of water or insufficient water in the water-cooled machine will also increase the temperature of the exhaust gas. 　　High exhaust pressure is mainly affected by the condensation temperature. According to the industry, the exhaust pressure generally corresponds to the level of the condensation temperature. Under normal circumstances, the discharge pressure of the compressor is very close to the condensing pressure. High exhaust pressure will increase the compression work and reduce the gas transmission coefficient, thereby reducing the cooling efficiency. 　　When the condensing pressure increases, the compressor discharge temperature also increases. As the compression ratio of the compressor increases, the air transmission coefficient decreases, thereby reducing the compressor's cooling capacity. Increased power consumption. If the exhaust temperature is too high, it will increase the consumption of compressor lubricating oil and make the oil thinner, affecting lubrication; when the exhaust temperature is close to the flash point of the compressor oil, it will also carbonize part of the lubricating oil and accumulate in the suction, The exhaust valve port affects the tightness of the valve. 　　The industry said that lowering the temperature of the cooling medium can cause the condensing temperature to drop, and the condensing pressure will also fall, but this is subject to environmental conditions and is difficult to choose. Increasing the cooling medium flow can reduce the condensation temperature a little. 　　 In addition, the reason why the exhaust pressure is too low is mostly caused by the low pressure side. The reason may be ice or dirty clogging of the expansion valve, and clogging of the filter, etc., so that the suction and discharge pressures are reduced. When users use refrigeration compressors, factors such as the purchase of early equipment, whether the design of the equipment is reasonable, whether the operation is standardized, and whether the environment is scientific and whether maintenance is in place will affect the normal operation of the equipment. Therefore, the user also needs to choose the equipment Pay more attention to all aspects of purchase, use and maintenance.

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