Because of their rotating components, all compressors require lubrication. Early designs of reciprocating compressors utilized a “splash system” in which the “throw” on the crankshaft would dip into an oil pool in the crankcase and splash it over the moving parts as the shaft rotated. Today, reciprocating compressors used in industrial refrigeration utilize “internal force feed” lubrication […]
Another way compressors are categorized is by the way the motor and compressor are mounted and contained. With “open drive” compressors, the motor and the compressor are mounted separately. The shaft that connects the motor to the compressor must be sealed to prevent refrigerant leakage from the compressor. Open-drive compressors are widely used in industrial applications. An […]
“Rotary vane compressors” are a third type of positive displacement compressor. The design of these machines makes them well suited for “high volume”, low-pressure differential applications. As such, rotary vane compressors are essentially limited in application as “booster compressors” in two-stage systems. The maximum compression ratio of a rotary vane compressor is 4:1. Like screw compressors, […]
The most common type of screw compressor is the ‘rotary screw compressor’. This type of compressor utilizes two rotors which are often called helical screws. One screw is designated the “male” screw and the other is a “female” screw. Vapor is drawn into the screw and captured in the space between the screws. The screws are precisely […]
Reciprocating compressors are the most common type of refrigeration compressor. The design of reciprocating compressors since their adoption in the mid-1800s is similar to that of a car engine. In a “recip”, compression is accomplished in the same manner as a bike pump. When the piston is pulled to one end, the cylinder volume increases and […]
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