1. Open Type Compressor

• Structural Features: The compressor body and drive motor are separate, connected by a coupling or belt. The crankshaft extends out of the body, requiring a shaft seal to prevent refrigerant leakage.

• Advantages: Motor can be replaced independently; good heat dissipation; suitable for high-power or special environments (e.g., explosion-proof requirements).

• Disadvantages: Shaft seal is a wear part, posing refrigerant leakage risk; large size and high noise.

• Typical Applications: Early large-scale industrial refrigeration (e.g., ammonia systems), special applications requiring explosion-proof motors.

2. Semi-Hermetic Compressor

• Structural Features: Motor and compressor share a common housing that is bolted together and can be opened. The motor windings are directly exposed to refrigerant and lubricating oil.

• Advantages: No shaft seal, very low leakage risk; lower noise and vibration; field serviceable (motor windings, valves, bearings can be replaced).

• Disadvantages: Motor cooling relies on suction gas, which may cause overheating under harsh operating conditions; higher cost than hermetic type.

• Typical Applications: Medium-to-large cold storages, central air conditioning, industrial refrigeration (e.g., Bitzer, Hanbell, Fusheng).

3. Hermetic (Fully-Sealed) Compressor

• Structural Features: Compressor and motor are welded inside a completely sealed steel shell, not openable.

• Advantages: Best sealing (virtually zero leakage); lowest noise; compact, lightweight, and low cost.

• Disadvantages: Not serviceable – internal failure (e.g., motor burnout, valve breakage) requires complete unit replacement; typically limited to small-to-medium capacity.

• Typical Applications: Household air conditioners, refrigerators, freezers, dehumidifiers, light commercial refrigeration equipment.

Quick Comparison Table

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