Alcatel Vacuum Technology Adixen ATH 1300 M, Руководство пользователя

Страница: 36 / 122

B 30
Alcatel Vacuum Technology France - User’s Manual ATH 1300 M/MT - ATH 1600 M/MT
Pump connections to an installation
2/6
GB 00733 - Edition 10 - Februar
y 03
Worst Case Turbo Pump
Crash Scenario
Definitions
The kinetic energy of the rotor has to be absorbed by the
installation
if the pump seizes suddenly.
The maximum resulting loads have been measured on a
test bench by simulating a worst case Turbo pump crash
with
a rotor split into 2 parts at nominal speed . The
impact of the rotor parts creates the following transient
loads.
The rotor parts can be ejected out of the pump inlet
flange and can impact on the plate of the valve or any
other part of the system. If this is placed close to the turbo
pump and if it has high stiffness the impact can create a
high axial load on the system. Such axial force has not
been observed on a standard pendulum valve.
The impact of the rotor parts on the housing will create a
radial force on the housing. This radial force will create a
bending moment on the system as a function of the
distance to the pump.
The deceleration of the rotor parts creates a torque value
on the pump housing, which is transmitted to the system.
The maximum values of the axial force and the bending
moment occur at approximately the same time. A delay of
up to several ms has been observed for the maximum
torque value.
Axial loads (a)
Bending moment (b)
Torque (c)
Loads transmitted to the
system (item 1)
Pump
Rotor
Pump fixed to
system : valve
Pendulum plate
Front view
Pump
Top view
Torque (c)
Loads :
Bending
moment (b)
Axial load (a)