Emerson ZB Copeland Scroll Service Manual download pdf (Page 5)

ZB Series

A simple scroll concept was first invented in 1905. As shown in the above drawing, a Copeland Scroll

has two concentric scrolls, one inserted

within the other. One scroll remains stationary as the other orbits around it. This movement draws gas into the compression chamber and moves

it through successively smaller "pockets" formed by the scroll's rotation, until it reaches maximum pressure at the center of the chamber from

where it is released through a discharge port in the fixed scroll.

During each orbit, several pockets are compressed simultaneously- so the operation is virtually continuous.

The scroll compression process :

Compression is accomplished by reducing

the size of the outside pockets as the scroll

relative motion moves them inwards towards

the discharge port

Suction is sealed off

as gas is drawn into the spiral.

Orbiting motion moves the gas toward

the center of the scroll pair and pressure

rises as pocket volumes are reduced

The gas reaches the central discharge

port at discharge pressure

Six distinct compression paths operate

simultaneously in a scroll set. The discharge and

suction processes are nearly continuous

Application guide

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Emerson ZB Copeland Scroll Service Manual Page 5