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3.2 Construction (fig. 3 and 4)
VWZ pumps are constructed in five main sections, i.e. gear box (Y
3
), compression
stages (S
1
, S
2
), oil supply (L
1
to L
12
), cooling system (R, Y
40
, R
1
) and separator
systems (Z, J
1
, J
2
, J
3
) on the suction side and exhaust side (optional). The pumps
are water cooled. The built in pressure relief valve (Q) permits start-up and
operation of the pumps over the entire vacuum range.
A
Vacuum connection
B
Exhaust connection
G
1
Drive
H
4
Cooling liquid filling cap
and pressure relief valve
I
4
Cooling liquid check
J
1
Filter candles in oil mist separator
J
2
Manometer for oil mist separator
J
3
Drain cock for oil mist separator
L
Oil pump
L
1
Oil pump feed line
L
2
Oil pump leakage line
L
3
Lubrication (LP) stage drive end
L
4
Lubrication (LP) stage non-drive end
L
5
Lubrication (HP) stage drive end
L
6
Lubrication (HP) stage non-drive end
L
7
Bearing lubrication (LP) stage
L
8
Bearing lubrication (HP) stage
L
9
, L
10
Lubrication pump chamber and
slot (LP) stage
L
11
, L
12
Lubrication pump chamber and
slot (HP) stage
Q
Pressure relief valve
R
Heat exchanger
R
1
Fan
S
1
Low pressure stage (LP)
S
2
High pressure stage (HP)
U
High temperature and operating
temperature thermostat
U
2
Cooling liquid de-aeration
V
7
Level control condensate / oil
Y
Fresh oil tank
Y
1
Bearing oil tank (LP) stage
Y
2
Bearing oil tank (HP) stage
Y
3
Gear box unit
Y
30
Gear box oil
Y
40
Cooling liquid
Z
Oil mist separator
3
