Refrigeration equipment such as water chillers, chromatography refrigerators, ice machines, ultra-low temperature refrigerators, etc., their driving force is the refrigeration compressor. The entire refrigerant cycle depends on the refrigeration compressor, so the role of the refrigeration compressor is immeasurable! The most important thing in the selection of refrigeration equipment is the purchase of refrigeration compressors, which directly determine the amount of refrigeration. This article introduces the role, classification and application scope of refrigeration compressors! The refrigeration compressor, that is, the refrigerant compressor, is the key part that determines the capacity of the vapor compression refrigeration system, and has a direct impact on the operating performance, noise, vibration, maintenance and service life of the system.
The role of the refrigeration compressor in the system is to suck the refrigerant vapor from the evaporator, increase its temperature and pressure, and discharge it to the condenser. In the condenser, the high-pressure superheated refrigerant vapor condenses exothermically at the condensation temperature. Then through the throttling element, the pressure-reduced gas-liquid mixture flows to the evaporator, where the refrigerant liquid absorbs heat and boils at the evaporation temperature, converts to vapor and enters the compressor, thereby realizing the continuous circulation of refrigerant in the refrigeration system . It can be seen that the refrigeration compressor is relative to the "heart" of the system.
There are many types of refrigeration compressors. According to the working principle, they can be divided into volume type and speed type. Volume type can be divided into two types according to the movement characteristics of the compression part: reciprocating piston type (referred to as piston type) and rotary type. According to the structural characteristics of the compressor, the rotary type can be divided into rolling piston type (also called rolling rotor type), sliding vane type, screw type (including twin screw type, single screw type), scroll type, etc. The speed type is carried out continuously according to the compressor compression process, and the main application is the centrifugal refrigeration compressor.
According to the classification of the evaporation temperature, it can be generally divided into three compressors: high temperature, medium temperature and low temperature. High temperature refrigeration compressor: -10°C~10°C; medium temperature refrigeration compressor: -20°C~-10°C; low temperature refrigeration compressor: -45°C~-20°C. According to the classification of the sealing structure, it can generally be divided into open-type compressors and closed-type compressors. The hermetic compressor can be divided into semi-hermetic and fully hermetic.