Technical Information; Description Of The Tv 801 Navigator Bolted Flange; Pump Description - Varian TV 801 Mode D'emploi

DESCRIPTION OF THE TV 801 NAVIGATOR
BOLTED FLANGE
The TV 801 Navigator Bolted Flange is composed
by a pump (869-8933) with an envelope with fins
and a shroud with two fans and a dedicated navi-
gator controller (SQ 337).
The pump is equipped with a ISO 160 F high vac-
uum flange.
The following pictures show the pump and the
controller.
Controller model SQ 337
Pump model 869-8933

Pump Description

The pump consists of a high frequency motor driv-
ing a turbine fitted with 8 bladed stages and 4
Macrotorr stages. The turbine rotates in an anti-
clockwise direction when viewed from the high
vacuum flange end.
The turbine is made of high-strength aluminium
alloy, machined from a single block.
Proceeding from the high vacuum to the for vac-
uum region, the turbine stages sequence is:
•
1st stage with a blade angle of 40°,
•
2nd stage with a blade angle of 34°,
•
3rd stage with a blade angle of 28°,
•
4th and 5th stages with a blade angle of 24°,
•
6th stage with a blade angle of 20°,
•
7th and 8th stages with a blade angle of 16°.
The Macrotorr stages are in the form of four 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
stainless steel. These are supported and accu-
rately 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 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.
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 25 flange.
52

TECHNICAL INFORMATION

87-900-980-01(B)