3
Donaldson Company, Inc.
Operation
Dust or fume enters through the extraction arm(s), and is
collected on the outside surfaces of the filter elements.
The clean, filtered air passes through the center of the
filter elements, into the blower, through the silencer
sections of the cabinet, and exits through the clean-air
outlet.
Filter cleaning starts when the blower is turned on. A
solid-state control timer energizes a solenoid valve,
causing the corresponding diaphragm valve to send a
pulse of compressed air through the filter elements (from
the inside outward), removing the dust from the outside
of the filter elements. The dust then falls into the hopper.
At the end of the pulse, the diaphragm valve closes and
the elements are back in normal operation. After a preset
time interval elapses, the timer sequences to the next
valve in the system. This cycle will continue until the
blower fan is turned OFF.
Filter Elements
Contaminated
Air Inlet
Clean Air Outlet
Clean Air Plenum
Blower Wheel and Motor
Compressed Air Manifold
Compressed Air Supply
(Purge Air)
Diaphragm Cleaning Valve
Normal Operation
Filter Cleaning
Unit Operation
