Which compressor type requires the use of a shaft seal?

The open type compressor is designed in such a way that the compressors and the driving motor are separate components. This configuration inherently requires a means to seal the shaft that connects the motor to the compressor to prevent the escape of refrigerant gas or other fluids being compressed. The shaft seal is crucial in preventing leaks, which can be harmful to the environment and detrimental to the efficiency of the system.

In contrast, closed type compressors, rotary type compressors, and scroll type compressors are constructed as sealed units, which means they do not necessitate an external shaft seal because their design inherently contains the refrigerant within the casing. This design feature contributes to their efficiency and reliability, as there are reduced chances for leaks compared to open type compressors.