Air-conditioner

Receiver dryer

Receiver dryer is called receiver for short. Its purpose is to prevent excessive storage of liquid refrigerant

In the condenser, the heat transfer area of the condenser is reduced and the heat dissipation efficiency is reduced. It can also filter out the impurities in the refrigerant, absorb the moisture in the refrigerant, prevent the dirty blockage and ice plug of the refrigeration system pipeline, and protect the equipment components from erosion, so as to ensure the normal operation of the refrigeration system.

It is used in the system with the expansion valve as the throttling device. It is installed between the condenser and the expansion valve. When the liquid refrigerant containing steam enters the liquid reservoir, the liquid and gaseous refrigerant are separated. The liquid refrigerant enters the evaporation tank (heat absorption tank) through the expansion valve, and the excess refrigerant can be temporarily stored in the liquid storage tank. When the refrigeration load changes, the liquid refrigeration dose supplied to the thermal expansion valve shall be supplemented and adjusted in time to ensure the continuity and stability of refrigerant flow. At the same time, because the combination of water and refrigerant will generate acid or ice, the desiccant in the reservoir can be used to absorb the water in the refrigerant to prevent the corrosion of parts or ice blocking the expansion valve. The filter screen is used to filter the impurities in the refrigerant and prevent the expansion valve from being blocked.

It is mainly composed of shell, sight glass, safety fuse plug and pipe joint. The flow of refrigerant in the reservoir is shown by the arrow in the figure. A glass liquid sight glass is installed at the outlet end of the upper part of the liquid reservoir to observe the flow state of the refrigerant during operation, so as to judge whether the refrigeration dose is appropriate. For vertical liquid reservoir, it must be installed vertically, and the inclination shall not exceed 15 °. Before installing a new receiver dryer, do not open the package of its inlet and outlet pipe too early, so as to prevent wet air from invading the interior of the receiver and system and losing its dehumidification function. Before installation, be sure to find out the inlet and outlet ends of the reservoir. The inlet and outlet ends of the reservoir are generally marked. For example, the inlet end is represented by the English letter in and the outlet end is represented by out, or an arrow is directly marked to represent the inlet and outlet ends.

A safety fusible plug, also known as fusible plug, is installed next to the outlet end of the reservoir,

It is a safety protection device of refrigeration system. There is an axial through hole in the center, which is filled with fusible materials such as solder. The melting point of these fusible materials is generally 85 ℃ – 95 ℃. When the condenser is not cooled enough due to poor ventilation or excessive cold air load, the refrigerant temperature and pressure in the condenser and reservoir will rise abnormally. When the pressure reaches about 3Mpa, the temperature exceeds the melting point of the fusible material. At this time, the fusible material in the central hole of the safety plug will melt, so that the refrigerant will escape through the central hole of the safety plug and be emitted into the atmosphere, so as to avoid the expansion of other parts of the system due to high pressure.

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