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The mainstream refrigeration compressors currently available on the market are mainly divided into five types: vortex type, piston type, screw type, centrifugal type, and rotor type. Many newcomers and even experienced professionals in various industries often have difficulty distinguishing the core differences, advantages and disadvantages, as well as the applicable scenarios of these types.
1. Scroll compressor
It is the mainstream model in the mid-to-high-end household and commercial refrigeration and heating pump fields. It focuses on quiet operation, high efficiency, and frequency conversion compatibility. It is one of the optimal solutions for small to medium-sized refrigeration and cooling scenarios with frequency conversion. It balances stability and energy consumption performance.
The scroll compressor belongs to the rotary volumetric compressor. The core working components are a pair of mutually meshing static and dynamic vanes. During operation, the static vane remains completely fixed, while the dynamic vane rotates eccentrically around the center of the static vane under the drive of the eccentric shaft, rather than rotating on its own. As the dynamic vane continues to rotate, the crescent-shaped sealed cavity formed between the static and dynamic vanes will gradually contract from the outside to the center, and the cavity volume continuously decreases. The internal gas is gradually and slowly compressed step by step, and the pressure steadily increases. Finally, the compressed high-pressure gas is smoothly discharged from the exhaust hole at the center of the static vane. The entire compression process is continuous and smooth.
The core components mainly include the dynamic vane, static vane, eccentric drive shaft, cross coupling ring, fixed support, back pressure chamber, sealing components, etc. The entire machine does not have the reciprocating motion components such as pistons and connecting rods of traditional reciprocating compressors, and the structure operates more smoothly.
2. Screw-type compressor
This is the core model in the fields of large-scale refrigeration and central air conditioning. It strikes a balance between stability and high cooling capacity output, making it the preferred choice for industrial cooling and large-scale commercial applications. It has balanced performance and strong adaptability.
3. Centrifugal Compressor
A representative of speed-type compressors, designed specifically for large cooling capacity scenarios, it is the core equipment for large-scale buildings and industrial centralized cooling. It has a large gas volume and high efficiency, and is suitable for extremely large working conditions.
Centrifugal compressors and the first four types of volumetric compressors have completely different principles. They belong to speed-type compressors and work by generating strong centrifugal force through the high-speed rotation of the impeller to do work on the gas. Refrigerant vapor enters the suction chamber and is precisely directed into the center of the high-speed rotating impeller by the guide vanes. Under the action of centrifugal force, it is rapidly ejected radially and achieves extremely high flow velocity; then the high-speed gas enters the diffuser and volute, where the kinetic energy is gradually converted into pressure energy, achieving continuous compression and exhaust. Multi-stage centrifugal compressors also achieve multi-stage compression through bends and return devices, further enhancing the pressure.
The core of a single-stage centrifugal compressor consists of the suction chamber, high-speed impeller, diffuser, volute, seals, and bearings; multi-stage compressor models additionally include bends, return devices, and intermediate coolers, with an overall compact structure and no reciprocating wear parts.
4. Rotor-type compressor
A cost-effective model for small cooling capacity scenarios, with a simple structure and affordable cost, it is a standard core component for household refrigeration equipment and occupies the mainstream market of small household refrigeration devices.
The rotor compressor is also a type of rotary volume compressor. It relies on the motor to drive the eccentric main shaft to rotate at high speed, which in turn drives the rolling rotor mounted on the shaft to perform eccentric rotary motion inside the cylindrical gas cylinder. The outer wall of the rotor naturally forms a crescent-shaped variable working cavity with the inner wall of the cylinder. At the same time, the accompanying sliding vanes are under the elastic force of the internal spring, always closely adhering to the surface of the rolling rotor, precisely dividing the internal space of the cylinder into independent suction chambers and compression chambers. As the rotor rotates, the suction chamber continuously expands for air intake, and the compression chamber gradually shrinks to complete gas compression, ultimately achieving continuous exhaust.
The overall structure is extremely simple. The core components only include the cylinder, rolling rotor, eccentric drive shaft, elastic sliding vanes, front and rear bearings, end cover, and sealing gasket. The number of parts is small, and the assembly difficulty is low. It is one of the most compact models among the five types of compressors.
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