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  Misc. Information

 Scroll Fixed Displacement Compressor   - Back to Index Page

The fixed displacement compressors compress refrigerant in accordance with the engine rotation.

In the scroll fixed displacement compressor, a movable scroll rotates to change the volume of space between the movable scroll and the fixed scroll, compressing the refrigerant.


In 1997 the first scroll fixed displacement compressor that adopted a centrifugal oil separator to reduce the amount of oil contained in circulating refrigerant, improving the efficiency of the air conditioning system was launched by Denso.

Benefits and Features

Small size and light weight

housing was improved , giving it a thinner wall while maintaining its strength, making it smaller and lighter.

The fixed scroll functions as a compression chamber wall, resulting in an even smaller
and lighter compressor.

High compressor efficiency and high durability

The oil separator removes most of the oil from the refrigerant when it is discharged from the compressor. That oil is then supplied to the compressor's sliding parts, maintaining lubrication of the compressor and increasing efficiency as well as durability.

The optimized shape of the scrolls further improves the compressor efficiency.

The reduced number of parts in the sliding section, including a simple
rotation-preventive mechanism, reduces energy loss caused by sliding.

Low noise and vibration

The reduced number of parts in the sliding section reduces mechanical noise.

The optimized housing shape reduces the pulsation of refrigerant discharged from the



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