Agilent Technologies X3500-64000 Mode D'emploi page 246

17 Technical Information
Description of the TwisTorr 304 FS
Figure 12
Pump Description
The TwisTorr 304 pump consists of a high frequency motor driving a
turbine fitted with 8 bladed stages and 3 TwisTorr drag stages. The
turbine rotates in an anticlockwise direction when viewed from the
high vacuum flange end.
The turbine is made of high-strength aluminium alloy, machined from
a single block. The TwisTorr stages are in the form of three disks.
The turbine rotor is supported by permanently lubricated 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 accurately positioned by spacer rings.
The TwisTorr stators are in the form of selfpositioning machined
disks. On each disk there are parallel spiral pumping channels
designed to pump in centrifugal direction on one side and in
centripetal direction on the other side. These are made of aluminium
alloy.
246/304
Model X3500-64010
TwisTorr 304 FS User Manual / 87-901-027-01(B)