Displacement Compressor

Definition of displacement compressor
Positive displacement compressors achieve gas compression by periodically changing the volume of the working chamber, with the core feature being the periodic isolation between the working chamber and the outside world.

Classification of displacement compressors
1. Reciprocating compressor: The piston undergoes linear reciprocating motion within the cylinder

2. Rotary compressor: The rotor rotates, including screw type, vortex type, etc

Working principle of displacement compressor

1.The working cycle of a reciprocating compressor consists of four stages:

Expansion process: The piston moves downwards from the top dead center, and high-pressure gas expands within the clearance volume
Inhalation process: When the cylinder pressure is lower than the intake pressure, the intake valve opens to suck in gas
Compression process: The piston moves upwards to compress the sealed gas, and the pressure continues to rise
Exhaust process: When the pressure exceeds the exhaust pipe pressure, the exhaust valve opens to discharge high-pressure gas

2. Working principle of rotary compressor
Screw type: The male and female rotors mesh to form a V-shaped compression chamber, and the volume gradually decreases with rotation
Vortex type: The dynamic and static vortex discs rotate relative to each other to form a crescent shaped compression chamber

Characteristics of displacement compressor
The volume change is independent of gas properties and can handle multiple media and achieve high-pressure output. However, intermittent exhaust causes airflow pulsation, so a buffer device needs to be installed, with a speed generally below 3000rpm.

Application of displacement compressor
1. Refrigeration field
Mainly used in air conditioning, cold air conditioning, automotive air conditioning, et
2. Industrial sector
Mainly used in oil extraction, ore mining, air separation and other fieldApplication of displacement compressor
1. Refrigeration field
Mainly used in air conditioning, cold air conditioning, automotive air conditioning, etc

2. Industrial sector
Mainly used in oil extraction, ore mining, air separation and other fields

3. Special fields
Medical equipment, inflatable diving bottles, etc