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Evobell 3500
L
B
C
D
K
E
F
G
H
I
J
B_01136
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OPERATING MANUAL
EDITION 05/2010
PART NO. DOC387841
4.4.2
FUNCTIONS OF THE HIGH ROTATION ATOMIZER
The high rotation atomizer consists of the premounted basic device (E) which consists of
the drive unit (D) and the bearing rods.
The bearing tube (L) is used to mount the device by the customer.
The optical-fi ber (C) is used to detect signals for speed control.
Material is fed to the device via the valve block (F) and the material tube (G) lying in the
axis center. This is then distributed evenly on the surface of the bell (I) via the distributor (J).
The deposited material is atomized fi nely in radial direction at the outer bell edge through
the acting centrifugal forces. The electrostatic infl uence supports this process.
Both the atomizing cone diameter as well as the kinetic energy of the atomized material
in the axial direction are infl uenced by the shaping air fl owing through the air conduction.
Specifi c cleaning of the bell is possible by means of the bell fl ushing valve without having
to fl ush the entire material channel.
The resistance block (B), as the connection of the high-voltage supply and atomizer (when
solvent paint is used), is required to reduce a possible spark gap when the bell approaches
the potential to ground. The resistor block decouples the capacities and causes damping
of the discharge. The discharge is reduced. The resistor block acts as a voltage divider. As
the current increases (e.g. as the bell approaches an object), the voltage at the edge of the
bell reduces. A sparkover will subsequently result.
When working with water-based paint, the system is connected to the rest of the system
by the paint column (ionic conductor), so that the effect of the resistor block is reduced.
The casing (A) serves as a shield for the applied high voltage, but also acts as a protective
cover for the complete atomizer.
