There are four reasons for the blockage of the refrigeration system of the low-temperature freezer: debris blockage, ice blockage, bad solenoid valve, bad expansion valve, etc.
1. Blockage of debris: Because the chiller refrigeration system has strict requirements in all aspects of production and manufacturing, it is necessary to ensure that each link must be cleaned. However, at present, most chiller manufacturers purchase components and then assemble them, so it is inevitable that some systems will be impure, and in severe cases, system blockage will occur. Generally, blockage occurs at the entrance of the filter or expansion valve. Therefore, chiller (freezer) manufacturers have installed "filters" in the refrigeration system to filter out impurities in the system. When the impurities in the pipes of the refrigeration system accumulate to a certain extent, the filter will be blocked, which will affect the refrigerant throughput of the system, and in severe cases, low-pressure failure will occur.
If the filter is clogged by a dirty system, it will only cause the cooling capacity of the device to drop slightly, and you may not even feel the impact. When the "filter" is slightly blocked, there will be a temperature difference between the inlet and outlet of the "filter", which can be felt by holding the inlet and outlet by hand. In severe cases, condensation or frost will appear on the filter. If condensation or frost occurs on the filter (when the machine is running, condensation does not count when the machine is stopped), it can be judged that the filter is blocked. At this time, just replace the filter of the same type.
2. Ice blockage: In essence, there is moisture in the system pipeline. The moisture in the system runs with the refrigerant to the throttle valve (expansion valve) after throttling and expansion, and forms a low temperature and low pressure state at the outlet of the throttle valve. When the evaporation temperature When the (throttle valve outlet temperature) is below the freezing point, the moisture in the refrigerant will form ice cubes here, which will block the throttle valve (expansion valve) and cause a low pressure failure. Ice blockage occurs at the throttle valve (expansion valve) outlet.
It is not difficult to deal with this kind of problem. It is best to use a detachable filter first, which is equipped with "calcium chloride" to thoroughly filter the water in the system for many times, and then replace it with a disposable filter of the same type. device.
3. The solenoid valve is broken: the solenoid valve is an indispensable accessory in the refrigeration system and has the function of protecting the safety of the system (when the compressor stops working, the refrigerant is cut off, and the refrigerant does not continue to flow to the evaporator. There is a large amount of refrigerant in the memory, when the compressor starts again next time, it is easy to cause liquid shock of the compressor valve plate and damage the compressor). When the solenoid valve is damaged, the flow of refrigerant is blocked, resulting in a low pressure failure. At present, most refrigeration manufacturers have omitted solenoid valves in order to reduce costs, but this also leaves hidden dangers to the equipment.
4. The expansion valve is damaged: the expansion valve is one of the four major components of the refrigeration system and is an indispensable component. Expansion valves are divided into mechanical expansion valves and electronic expansion valves; mechanical expansion valves are affected by the environment during use. In some environments, corrosive gas will corrode the liquid, causing the expansion valve to corrode. Most of them are the gas in the temperature sensing package of the expansion valve. Leakage (corrosion of the connecting tube connecting the bulb to the valve body). Although the electronic expansion valve has the advantages of large temperature control range and high precision that the mechanical expansion valve cannot surpass, it has an independent control system, which also increases the failure rate. If the expansion valve is damaged, it should only be replaced.
If you need to know about low temperature chillers, screw chillers, freezers, ice water chillers, screw chillers, chillers and refrigerators and other refrigeration products, you can contact us at RICOM, and we will try our best to solve the problems of chiller use, cold water for customers. If the machine is not refrigerating and other problems, we wholeheartedly recommend customers to choose the chiller product, so that everyone can buy happily and use it with confidence. Welcome to consult us at any time. RICOM industrial chiller unit adopts original configuration, fully automatic computer controller, which can precisely control the temperature of the coating machine. According to customer requirements, formulate different usage methods to produce refrigeration equipment that meets customer requirements to ensure the high quality of coating parts.