Downflo Workstation, DWS 4-1 to 6-4
4
Operation
During normal operation, the power module containing
the blower draws dust-laden air from the work space
through the filter cartridges. Dust collects on the outside
surface of the filters. Clean, filtered air flows through to
the center of the cartridge, through the clean-air plenum
and into the blower silencer plenum. Filtered air exits
through the top of the cabinet.
Filter cleaning is completed using pulse-jet technology.
A solenoid valve controlled by a solid-state timer and
a diaphragm valve aligned to each filter provides the
pulse cleaning. The diaphragm valve sends a pulse of
compressed air through the filter cartridge from the
inside out and collected contaminants fall into the dust
drawers. At the end of each pulse, the diaphragm valve
closes and the filter cartridge resumes normal operation.
One filter cartridge is cleaned per pulse.
Unit Operation
clean air outlet
inlet
filter
cartridges
blower
silencer
plenum
Normal Operation
dust
drawers
filter clean
purge
Filter Cleaning Operation
