Agilent Technologies Turbo-V 81-M Bedienungshandbuch Seite 196

17 Technical Information
Description of the Turbo-V 81-M
Proceeding from the high vacuum to the forevacuum region, the
turbine stages sequence is:
1st stage with a blade angle of 40°,
2nd stage with a blade angle of 30°,
3rd stage with a blade angle of 24°,
4th and 5th stages with a blade angle of 18°,
6th stage with a blade angle of 14°;
7th, 8th and 9th stages with a blade angle of 12°.
The Macrotorr stages are in the form of three discs.
The turbine rotor is supported by permanently lu-bricated high
precision ceramic ball bearings in-stalled on the forevacuum side of
the pump.
The static blades of the stator are made of stain-less steel. These are
supported and accurately positioned by spacer rings.
The Macrotorr stators are in the form of self-positioning machined
discs with pumping channels and an opening restricted by the
corresponding rotor discs. These are made of aluminium alloy.
During normal operation, the motor is fed with a voltage of 54 Vac
three-phase at 1350 Hz (max). To reduce losses during start-up to a
minimum, the frequency increases according to a ramp with a higher
initial voltage/frequency ratio.
The pump can be water cooled or air cooled: in the first case the
customer can use a dedicated external plate made of nickel-plated
brass, in the second case an external optional fan is available.
A thermistor sensor is mounted near the upper bearing to prevent
the pump from overheating.
The pump is balanced after assembly with a resid-ual vibration
amplitude less than 0.01 μm.
The pump can operate in any position and can be supported on the
high vacuum flange. The connection of the forevacuum on the side of
the pump is a KF 16 NW flange.
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All manuals and user guides at all-guides.com
Turbo-V 81-M User Manual / 87-900-983-01 (E)