Pump Description - Agilent Technologies TV 902 Navigator Notice De Mode D'emploi

Pump Description

The pump consists of a high frequency motor driving a turbine fitted
with 7 bladed stages and 2 Macrotorr stages. The turbine rotates in
an anticlockwise direction when viewed from the high vacuum flange
end. The turbine is made of high-strength aluminium al-loy, machined
from a single block. Proceeding from the high vacuum to the for vacu-
um region, the turbine stages sequence is:






The Macrotorr stages are in the form of two 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 po-sitioned 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 646 Hz. To re-duce losses during start-up to a
minimum, the fre-quency increases according to a ramp with a higher
initial voltage/frequency ratio.
The pump has to be air cooled and an external fan is available.
TV 902 Navigator User Manual / 87-900-999-01
1st stage with a blade angle of 45°,
2nd stage with a blade angle of 35°,
3rd stage with a blade angle of 25°,
4th stage with a blade angle of 20°,
5th stage with a blade angle of 18°,
6th and 7th stages with a blade angle of 16°.
Technical Information
Description of the TV 902 Navigator
(B)
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