Refrigeration principle of general refrigerator The function of the compressor is to compress the steam with lower pressure into steam with higher pressure, so that the volume of steam is reduced and the pressure is increased. The compressor draws in the lower pressure working fluid vapor from the evaporator, causes the pressure to rise, and then sends it to the condenser, which is condensed into a higher pressure liquid in the condenser, and becomes a pressure after being throttled by the throttle valve. After the low liquid is sent to the evaporator, it absorbs heat in the evaporator and evaporates to become a lower pressure steam, thereby completing the refrigeration cycle.
The horizontal shell-and-tube type ammonia condenser is composed of a horizontal cylinder body, a front cover and a rear cover. The horizontal shell-and-tube type ammonia condenser cylinder is welded with a tube sheet at both ends, and the seamless steel tube is also fixed by the expansion method or the welding method on the tube sheet. The front and back covers of the horizontal shell-and-tube type ammonia condenser are cast iron pieces with partitions (divided ribs).
A rubber gasket is placed between the cover plate and the cylinder body, and is fixed by bolts. In addition to the cooling water entering and leaving the front cover, some of the front cover is also provided with a water discharge cock; the upper and lower parts of the rear cover are respectively provided with a venting cock and a water discharge cock. When the condenser starts to operate, the bleeder cock can be opened to remove air from the cooling water pipe, filling the pipe with cooling water. When the condenser is stopped or serviced, the drain cock can be opened to drain all of the cooling water.
When the condenser is operated, ammonia vapor enters the gap between the condenser tubes from the top of the cylinder, and the condensed ammonia liquid is discharged from the lower portion of the cylinder. The cooling water flows into the condenser from the inlet pipe at the lower part of the front cover plate, and sequentially flows in the pipe from bottom to top according to the flow path formed by the water dividing plate, and finally flows out from the outlet pipe at the upper portion of the front cover plate.