Refrigerating core installation. Compressor
The operation of the compressor to suck the steam leaving the evaporator and make it to the condenser. The most common type is the piston compressor, but other types won acceptance, for example. centrifugal, screw and scroll compressors. Piston compressor covers a very wide power range, to the right of the small single cylinder modeIs for household refrigerators up to 8 up to 12 cylinders modeIs with a large working volume of industrial applications.
In small applications in hermetic compressor is where the compressor and engine built together as a complete hermetic block. For medium-sized plants, one of the most common compressors is the large size of hermetic compressors in any of the piston or select the version. Applications for both air conditioning, General commercial refrigeration equipment and conditioners.
For larger plants the most common is the semi-hermetic compressors. The advantage here is that the shaft glands can be avoided; it is very difficult to replace, when they begin to leak.
However, the design may not be used on aggregates of ammonia as the refrigerant attacks in the motor windings. Even more HFC compressors, and all the ammonia compressors, designed as open compressors, i.e. with the motor outside the housing. The transmission power can be direct, crankshaft or through a belt drive.
For special applications, there is oil-free compressor. But lubrication of the bearings and cylinder walls with oil as a rule, is always necessary. The large refrigeration compressors oil circulates through the oil pump.
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