Compressor operation in the heart of the refrigeration system in 2020 A compressor is a fluid machine that raises low-pressure gas to high-pressure gas. It sucks low-temperature and low-pressure refrigerant gas from the suction pipe, drives the piston to compress it through the operation of the motor, and discharges high-temperature and high-pressure refrigerant gas to the exhaust pipe to provide power for the refrigeration cycle, thereby achieving compression-condensation (heat release) )-Expansion-evaporation (heat absorption) refrigeration cycle. Therefore, it is regarded as the heart of the refrigeration system. Refrigeration compressors can be divided into two types: volume type and speed type according to their working principles. Volumetric compressors are divided into two types: piston type and rotary type.
Piston compressor relies on the reciprocating motion of the piston to compress the gas in the cylinder, usually through the crank connecting rod mechanism to transform the rotary motion of the prime mover into the reciprocating motion of the piston. Rotary compressors are gas compressions that rely on volume changes that occur when the rotor in the cylinder rotates. Rotary compressors can also be divided into many different structural types such as rotary, scroll, screw and sliding vane types. Velocity compressors use mechanical methods to obtain high flow velocity of the flowing gas, and then reduce the flow velocity of the gas in the expanding channel, so that the kinetic energy of the gas is converted into pressure energy to achieve the purpose of increasing the gas pressure. In refrigeration or heat pump systems, speed compressors are almost all centrifugal compressors. According to the current development level of refrigeration technology, various compressors can have their own general application range according to their cooling capacity. Piston refrigeration compressors are mainly used in household refrigerators, freezers, automotive air conditioners, etc.; rotary compressors have almost monopolized all shares in the field of household air conditioners, and are gradually being transformed into household central air conditioners and commercial The field of central air-conditioning has been expanded. In addition, it is also widely used in other fields such as dehumidifiers, heat pump dryers, heat pump water heaters, etc.; scroll compressors are used in high-power household central air conditioning, commercial refrigeration, and heat pumps; screw compressors are mainly It is used in the fields of commercial refrigeration and large-scale air conditioners. Among them, twin-screw air compressors are also widely used in machinery, metallurgy, electronic power, medicine, packaging, chemical industry, food, mining, textile, transportation and many other industrial fields.
