Product Description
Use
The vacuum pump is intended for
–
the suction
of
–
non-explosive gases and vapours
The vacuum pump may only be used as contractually agreed with
Busch. The conveyed medium, the operating liquid and the tempera-
ture ranges thereof may not be changed without written consent of
Busch.
Maximum allowed temperatures:
gas dry:
120 °C
gas saturated:
100 °C
operating liquid:
80 °C
The vacuum pump is intended for the placement in a non-potentially
explosive environment.
The vacuum pump is thermally suitable for continuous operation
(100 percent duty).
The vacuum pump is not ultimate pressure proof. Operation with a
closed (“blanked”) suction line will damage the vacuum pump.
Principle of Operation
The vacuum pump works on the fluid ring principle.
At standstill, the pump housing (g) shall be filled with an operating liq-
uid (usually water) to approx. the shaft centreline. On starting the
vacuum pump, the impeller throws the liquid to the periphery of the
housing, where it forms a liquid ring that rotates in the pump housing.
This liquid ring seals the space between the impeller (h) and the hous-
ing (g). In the 12 o’clock position the liquid ring touches the hub of the
impeller (h). As the impeller rotates counterclockwise (view from
non-drive end), the liquid ring moves away from the hub, making
space for gas to be drawn in through the intake port (e) (approx. from
the 11 o’clock to the 8 o’clock position). The chamber surrounded by
the hub, the liquid ring and two adjacent impeller blades achieves its
maximum volume in the 6 o’clock position. As the impeller continues
to rotate, the liquid ring moves closer to the impeller hub, the volume
of the chamber decreases and the enclosed gas is expelled through the
discharge port (f) (approx. from the 3 o’clock position to the 12 o’clock
position). This sequence is repeated for every chamber between two
impeller blades with each revolution.
The operating liquid also absorbs the heat of compression and conden-
sation (when conveying saturated media).
The control of the level and the temperature of the operating liquid are
essential for the satisfactory operation of the vacuum pump. The chap-
ter Installation Prerequisites (
Ú
page 5) gives advice and explains typi-
cal installation options.
2 stages, both working on the principle described above, are installed
in line in order to achieve a better ultimate/differential pressure.
Cooling
The vacuum pump is cooled by
–
the air flow from the fan wheel of the drive motor
Product Description
LA
0053-1111
A, LB
0063-1011
A
0870150638
page 3
a
Suction connection
b
Level plug
c
Gas discharge
d
Drain
e
Suction port
f
Discharge port
g
Housing
h
Impeller
i
Liquid ring
j
Service liquid inlet
Summary of Contents for DOLPHIN LA 0053-0143 A
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