Operating Manual
© Dürr Systems AG
EcoBell2 SL EC - Rotating Atomizer with External Charging
Operating principle
Document No.: MRA00001EN
Version:: 07
•
As of:: 01/2020
39 / 156
The shaping air flows out of the nozzles of the shaping air ring along
the bell disk and hits the paint droplets at the edge of the bell disk.
The shaping air forms the spray cone. The shape of the spray cone
has an impact on the quality of the coating and the efficiency.
Fig. 213: The shaping air at the bell disk (example)
Pos: 29 /INP/ Bell2/04_03_06 Außenauf ladung_AA @ 44\mod_1423645795708_20.do cx @ 534399 @ 3455 @ 1
4.4.6
External charging
For the function of external charging, the atomizer is equipped with an
electrode ring. The electrode ring is made of a special plastic.
Fig. 14: Electrode ring
On the back of the electrode ring the high voltage cable is connected.
Inside the ring, the high voltage is conducted from the connection to
the electrodes. There are resistances in each electrode which feed the
high voltage to the needles in the ends of the electrodes.
4.4.6.1
Function
After leaving the bell disk the paint drops charge in the electrostatic
field of the electrode. The surface of the work piece to be painted is
grounded. Therefore, the droplets are attracted to the surface.
