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In air conditioning and refrigeration, in order to enable the reliable and stable operation of the refrigeration system and improve the economics of operation, it is necessary to configure some auxiliary equipment, mainly refrigerant purification equipment, refrigerant gas-liquid separation and lubricant oil separation, and mobile phone equipment , Security protection devices, etc. Different refrigeration systems require different auxiliary equipment and different amounts.
The role, structure and working principle of some commonly used auxiliary equipment are introduced below.
Detailed explanation of refrigerant purification equipment and air-conditioning auxiliary equipment
(1) Filter
During the processing and welding of the refrigeration system, impurities such as dust, metal debris and oxide scale may remain in the system; after the refrigeration system is operated for a period of time, dirt may also be generated in the system due to wear and corrosion of the machine parts . Therefore, the refrigeration system needs to be equipped with a filter to filter out impurities mixed into the refrigeration system to prevent the formation of dirty clogging in the refrigeration system piping.
The filter is divided into a gas filter and a liquid filter. The gas filter is installed on the suction line of the compressor, the liquid filter is installed on the refrigerant liquid filter line in front of the throttle valve, and the individual filters are installed with a filter in a metal shell. Generally, the freon filter uses a copper wire mesh, the mesh of the mesh is 0.1mm, and the air hole of the filter is 0.2mm.
Some refrigeration systems do not have a separate filter, but a gas filter is installed in the suction chamber or suction hole of the compressor, and a liquid filter is installed at the inlet of the throttle valve to serve as gas and liquid. The role of the filter.
(2) Dryer
Before the refrigeration system is charged with refrigerant, although it is first processed by a vacuum pump, a small amount of moisture will remain; the refrigerant will also contain a small amount of moisture. When the temperature is low, the compatibility of Freon and water is reduced, and as the refrigerant circulates in the system, it is easy to form an ice plug at the thermal expansion port or the capillary outlet end. Therefore, in the Freon refrigeration system, a dryer is often installed on the liquid line in front of the expansion valve, which is used to absorb the residual moisture in the system.
The dryer is usually assembled with the filter, called the dry filter. It is in a steel pipe or copper pipe shell, equipped with two layers of copper wire filter and desiccant.
Dry filter installation methods include flat connection method and forward vertical connection method. When conditions permit (such as household refrigerators), it is advisable to adopt the vertical connection method, in which the refrigerant flows in from the upper part of the filter drier and flows out from the lower part. In this way, the flow direction of the refrigerant is consistent with its gravity direction, the flow resistance loss is small, the refrigerant and the molecular sieve mesh are in uniform contact, and the impurity precipitation interval is larger than that in the plain packaging, and more impurities can be filtered out.
When ice blockage or dirty blockage occurs in the refrigeration system, the filter drier should be replaced. In addition, due to the gradual failure of the molecular filter after a period of use, more and more impurities are gradually deposited in the filter, and the filtration capacity is reduced. Therefore, as long as the refrigeration system is opened during maintenance, the drying filter is usually replaced.
In addition, when adding refrigerant to the Freon refrigeration system, a dry filter should usually be connected in series.
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