What are the common types of compressors?

Compressors can be classified based on operating principles, structural forms, or application scenarios. Common types are as follows:

I. Classification by Operating Principle (Core Classification Method)

1. Positive Displacement Compressors (Achieve pressurization by reducing refrigerant gas volume; most widely used)

Reciprocating Compressor (Piston Type)

Principle: Compresses gas volume through reciprocating piston movement within a cylinder.

Characteristics: Simple structure, low cost, suitable for low-to-medium displacement applications (e.g., home refrigerators, small air conditioners); however, produces significant vibration and noise, with efficiency decreasing as displacement increases.

Rotary compressors

Rotary vane compressors (rolling rotor type)

Principle: An eccentric rotor rotates within the cylinder, forming variable-volume chambers with the cylinder wall to compress gas.

Features: Compact size, light weight, smooth operation; widely used in household air conditioners and small heat pumps.

Screw Compressor

Principle: A pair of male and female screws mesh and rotate, compressing gas between their tooth grooves.

Features: High displacement, high efficiency, long service life. Suitable for large central air conditioning systems and industrial refrigeration systems.

Scroll Compressor

Principle: A stationary scroll and a moving scroll move relative to each other, gradually reducing the enclosed volume to compress gas.

Characteristics: Highly energy-efficient, extremely low noise, compact structure. The mainstream choice for high-end residential air conditioners and inverter air conditioners.

2. Dynamic Compressors (Utilize high-speed rotating impellers to perform work on gas, increasing pressure)

Centrifugal Compressor

Principle: High-speed rotating impellers generate centrifugal force, imparting kinetic energy to gas, which is then converted into pressure energy via a diffuser.

Features: Suitable for high-displacement, medium-to-low pressure applications (e.g., large chillers, industrial gas transport). Complex structure and higher cost.

II. Classification by Cooling Method

Air-cooled compressors: Utilize forced air cooling via fans, suitable for small equipment.

Water-cooled compressors: Dissipate heat through circulating cooling water, suitable for large, high-power units (e.g., screw-type, centrifugal).

III. Classification by Application Scenario

Residential/Small Compressors: Primarily rotary and scroll types (e.g., air conditioners, refrigerators).

Industrial/Large Compressors: Primarily screw and centrifugal types (e.g., chillers, cold storage facilities).

Different compressor types exhibit significant variations in efficiency, noise levels, cost, and suitability. Selection requires comprehensive evaluation based on cooling capacity, pressure requirements, and operating environment.