Failure analysis and solutions of various configuration components of refrigeration unit

Failure analysis and solutions of various configuration components of refrigeration unit

Reasonably match the refrigeration capacity and refrigeration load of the refrigerator. Adjust the number of operating refrigeration compressors appropriately according to the size of the refrigeration load. The capacity adjustment device can also be used to adjust the cooling capacity of the refrigeration compressor. When the evaporation temperature is too low, the number of working cylinders of the refrigeration compressor can be appropriately reduced.

　　 Frequently check whether the throttle valve is open properly and whether there is blockage, adjust and clean if necessary. The filter of the float valve and the ammonia pump filter of the ammonia pump liquid supply system should be cleaned regularly, and the filter drier of the Freon system should also be cleaned regularly.

　　 Ensure proper liquid supply to the evaporator. The liquid supply of the required cooling room evaporator should be appropriately adjusted according to the changes in the cooling load. If there is too little refrigerant in the refrigeration system, it should be filled with refrigerant.

　　According to the frosting situation of the evaporator, choose an appropriate method to defrost at the right time, because too thick frost layer affects the heat transfer effect of the evaporator.

　　 The low-pressure evaporator of the refrigeration system should regularly drain oil and air. The ammonia refrigeration system can use hot ammonia defrosting method to remove the oil in the evaporator. Low-pressure circulation barrels and drain barrels should also be drained regularly.

　　 During the operation and management of the refrigeration system, the evaporating temperature, condensing temperature and refrigeration load should be kept suitable. In the actual operation of the refrigerator, the external environment temperature is constantly changing, and the heat load is constantly changing. Therefore, the condensing temperature and evaporating temperature are also constantly changing, and the cooling capacity of the refrigerator is also constantly changing. The refrigeration coefficient is the ratio of the cooling capacity to the power consumption, and it is the main economic indicator to measure the economic rationality of the refrigerator operation. The larger the refrigeration coefficient, the better the economical operation of the refrigerator and the better the energy saving effect. The coefficient of refrigeration is a function of the evaporation temperature and the condensation temperature. Therefore, in order to improve the refrigeration coefficient, the refrigeration system parameters must be adjusted reasonably.

　　 Reasonably adjust the intermediate pressure and intermediate temperature. The intermediate pressure and the intermediate temperature are related to the condensation temperature, the evaporation temperature and the volume ratio of the high and low pressure machines. It is worth noting that in actual operation, the normal liquid level of the intercooler must be maintained. This is not only beneficial to reduce the exhaust temperature of the high-pressure machine and prevent the formation of carbon deposits, but also helps to reduce the temperature of the refrigerant liquid in front of the throttle, increase the unit refrigeration capacity, and increase the refrigeration coefficient.

　　 The condensation pressure should be compatible with the condensation temperature. If the condensing pressure is too high, check whether the relevant valves of the high-pressure system are open, perform air and oil discharge, increase the cooling water and cooling air volume, reduce the cooling water temperature, reduce the heat load, and configure the condenser reasonably.

　　 The evaporation pressure should be compatible with the evaporation temperature. Air-conditioning systems and medium-temperature and medium-pressure refrigeration systems generally have an evaporation pressure higher than atmospheric pressure, which helps prevent air from entering the refrigeration system. For places requiring low temperatures, multi-stage compression refrigerators, cryogenic refrigerators or low temperature refrigeration devices can be selected according to the actual situation.

　　 In the refrigeration system, the refrigeration compressor is usually equipped with a motor according to the maximum power condition. This is correct for safe operation. However, in actual operation, the cooling conditions are constantly changing. The motor of the low-pressure unit of the matched two-stage compressor often has a low load, resulting in a low power factor of the motor. Safety factor. Optional electric motor to improve the power factor of the low-voltage machine motor. For other motors that have been operating at low load for a long time and have a lower power factor, a motor saver can be selected to increase the power factor. The motor saver adopts microprocessor digital control technology to control transient voltage and harmonic current, and dynamically adjust the voltage and current during motor operation without changing the motor speed, reducing motor iron loss and copper loss, and reasonable matching Output torque and load, reduce temperature rise and noise, and have soft start function.