Emerson Climate Technologies: Refrigeration: Scroll Reliability
Reliability
is a major concern in most refrigeration applications. Equipment has to be
ready to run 24/7, 365 days a year. The
Copeland Scroll™ compressor is your most reliable compressor solution.
With over 26 million scrolls installed, and thousands in refrigeration
applications, Copeland understands your need for reliability.
Let us
tell you why Copeland Scroll™ compressors are the most reliable solutions
for refrigeration systems.
A Copeland Scroll™ compressor simply has fewer parts.
Fewer parts eliminates many failure modes.
Reciprocating designs (hermetic or semi-hermetic) contain many components.
Generally, there are 9 parts for every cylinder: Suction Reed,
Discharge Reed, Piston, Piston Rings, Wrist Pin, Connecting Rod, Valve Plate,
Body and Gasket.
Scroll compression simplifies the compression process to 2 parts: a fixed
and an orbiting scroll. There are no suction reeds to break. The
parts that are most susceptible to high temperature (wrist pins, connecting
rods) are removed.
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9 Parts Per Cylinder |
2 Parts Per Compressor |
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Most scroll designs have a groove machined into the scroll "tips" where
a "tip seal" is inserted. The tip seal's sole purpose is to
prevent leaks when the fixed and orbiting scrolls are mated together and
running.
No matter what the material, seals wear out over time - so we have
engineered a better solution. Copeland's scroll elements are
precision machined to microns of an inch in length, providing a
metal-to-metal sealing surface that polishes itself in over
time. It actually improves the surface microfinish as it runs.
This patented design was created specifically to provide the
longest life possible.
A Copeland Scroll™ compressor polishes as it operates,
wearing in rather than out.
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One of the most punishing consequences of refrigeration applications is the
tendency for liquid "slugs" of refrigerant that come back to the
compressor. Liquids are of course incompressible, and they will fail a
compressor faster than any other system problem.
The key to managing liquid refrigerant slugs is "compliance".
Compliance is the ability of scrolls to separate under abnormal conditions.
Copeland's patented scroll design uses both axial and radial compliance to deal
effectively with liquid.
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Axial Compliance
Radial Compliance |
A Copeland
Scroll™ compressor handles liquid
better
than any other compressor, making it the most reliable
choice for grueling refrigeration applications.
