7
1.4.2. Working principle of
a centralized filling ramp
The concept is to fill a cell with
water up to a specified level (
N
)
allowing gas which is in the cell
to escape. When the maximum level
is reached, the electrolyte closes
the gas exhaust tube and the
consequent excess pressure stops
the water flow into the cell.
The water will then flow to the next
cell and so on, to the last cell of the
hydraulic circuit.
The centralized filling ramp is a
soldered assembly of the monoblock
cover (1) and a ramp (2) equipped
on the upper part with a tubular
water inlet (3) and a tubular water
outlet (4), and an exhaust tube (5)
on the lower part (see fig.1 below).
The water flows across the ramp
through a plunging siphon (6) and
into the cell through the exhaust
hole (7), while the air escapes
through the exhaust tube (5).
The lower edge of the gas exhaust
tube (5) settles the expected
electrolyte level of the cell.
When the electrolyte reaches
this level, the remaining air in the
cell can no longer escape through
the gas exhaust tube (5) and
the water reserve generated by
the plunging siphon (6) ensures
a safe obstruction of the gas
inside the cell. When the filling
of the cell is finished, the water
flows to the next cell or the next
monoblock.
The centralized filling ramp has no
moving parts and offers full
operational security. Further, this
system prevents the cell electrolyte
from any contact with the next cell,
thus avoiding any risk of current
leakage between several cells in
a battery.
&
Filling through gravity
The flow rate of the water
must be between 0.7 and
1 liter/minute and the relative
pressure under 0.15 bar.
&
Low pressure filling
The flow rate of the water must
be lower than 0.7 liter/minute
and the relative pressure below
0.3 bar.
Figure n° 1
Summary of Contents for STM 5-100
Page 1: ...Technical manual installation operation and maintenance for Ni Cd STM MR MRE monoblocks type ...
Page 23: ...Appendix 1 20 Monoblock STM 5 100 MR G RD equipped Positive left Filling right ...
Page 24: ...21 Appendix 2 Monoblock STM 5 100 MRE G RD equipped Positive left Filling right ...
Page 25: ...Appendix 3 22 Monoblock STM 5 140 MR G RD equipped Positive left Filling right ...
Page 26: ...Appendix 4 23 Monoblock STM 5 140 MR D RG equipped Positive right Filling left ...