In the refrigeration industry, two distinct families appear:
Positive displacement: Compression is achieved by reducing the internal volume of a compression chamber.
There are compressors:
A pistonA screwA spiralRotaryCentrifugal compressors: These are rotary machines in which the compression of gaseous FF mainly due to the centrifugal force
II. THE ROTARY AND SPIRO-ORBITAL
II.1 The rotary compressors
1. Operating principle
The rotary compressors consist of a "piston" (called turning or rolling) and one or more pallets. Compression is achieved by volume reduction between the "piston" and the palette.
There are rotary compressors:
A rolling pistonA palleta) The rotary rolling piston compressor
It consists of a stator within which is arranged eccentrically a rotor (piston). A palette is mounted on the stator. Compression is achieved by volume reduction.
b) The vane rotary compressor
It consists of a cylindrical stator within which is arranged eccentrically a rotor (piston). Pallets are mounted on the rotor.
2. Advantage over a piston compressor
It can be mounted in any position
He has a couple regular
Robust
II.2 The scroll compressors (scroll)
1. Operating principle
Compression is accomplished through two spirals nested one inside the other. A spiral is fixed and the other is driven in an orbital motion. This movement creates pockets of gas that are displaced and compressed to the discharge port.
2. Advantages over a rotary compressor
Number of moving parts reduces
Low vibration, quiet
Low starting torque
Absence of valves (only one non-return valve located in the discharge connection)
Supports slugging
Very high volumetric efficiency
Positive displacement: Compression is achieved by reducing the internal volume of a compression chamber.
There are compressors:
A pistonA screwA spiralRotaryCentrifugal compressors: These are rotary machines in which the compression of gaseous FF mainly due to the centrifugal force
II. THE ROTARY AND SPIRO-ORBITAL
II.1 The rotary compressors
1. Operating principle
The rotary compressors consist of a "piston" (called turning or rolling) and one or more pallets. Compression is achieved by volume reduction between the "piston" and the palette.
There are rotary compressors:
A rolling pistonA palleta) The rotary rolling piston compressor
It consists of a stator within which is arranged eccentrically a rotor (piston). A palette is mounted on the stator. Compression is achieved by volume reduction.
b) The vane rotary compressor
It consists of a cylindrical stator within which is arranged eccentrically a rotor (piston). Pallets are mounted on the rotor.
2. Advantage over a piston compressor
It can be mounted in any position
He has a couple regular
Robust
II.2 The scroll compressors (scroll)
1. Operating principle
Compression is accomplished through two spirals nested one inside the other. A spiral is fixed and the other is driven in an orbital motion. This movement creates pockets of gas that are displaced and compressed to the discharge port.
2. Advantages over a rotary compressor
Number of moving parts reduces
Low vibration, quiet
Low starting torque
Absence of valves (only one non-return valve located in the discharge connection)
Supports slugging
Very high volumetric efficiency
