Leybold Heraeus Turbovac 1000 Turbomolecular Vacuum Pump 89589 Made in Germany

Description

Leybold Heraeus Turbovac 1000 Turbomolecular Vacuum Pump Made in Germany
Turbomolecular vacuum pumps (TURBOVAC) are used in applications which require a clean high or ultrahigh vacuum like, for example, in research, development or in industrial fields like the semiconductor industry, analytical instrumentation or coating technology.
Principle of Operation
In principle, the turbomolecular pump is a turbine rapidly revolving in a housing where the rotor stages of the turbine are equipped with a number of rotor blades. Located between the rotating rotor blades are stationary stator disks with blades arranged in the opposite direction. By means of a momentum transfer from the rotating rotor blades to the gas molecules their initially nondirectional thermal motion is changed in to a directional motion from the inlet flange of the pump in the axial direction towards the forevacuum flange. In the molecular flow range (i.e. at pressures below 10-3 mbar (0.75 x 10-3 Torr)) the mean free path of the gas molecules is larger then the spacing between the rotor and the stator blades (typically a few tenths of a millimetre). Correspondingly the molecules chiefly collide with the optically dense rotor blades, resulting in a highly efficient pumping action. In the laminar flow range (i.e. at pressures over 10-1 mbar (0.75 x 10-1 Torr)) the effect of the rotor is impaired by frequent collisions between molecules themselves. For this reason, a turbomolecular pump is not capable of pumping gases at atmospheric pressure.
Rotor Bearing
Leybold offers differ ent rotor bearing systems. A purely classic mechanical type of rotor bear ing (TURBOVAC) or a magnetic rotor bearing (TURBOVAC MAG) and also a hybrid bearing (TURBOVAC i / iX) where the bearing on the forevacuum side is a ceramic ball bearing lubricated for life and where the bearing on the high vacuum side is implemented by way of a non-wearing magnetic bear ing. Typical for all these types of bearing is that they do not require any lubricating oil which under circumstances like standstill of the pump might diffuse back into the vacuum chamber due to the lack of any pumping action.
Drive Electronics/Control Unit
Driving and monitoring the turbomolecular pump requires an electronic frequency converter (inverter). The frequency converter delivers the driving voltage and the output frequency for the motor and also automatically monitors the system. Optimum running up of the pump rotor is attained by a steadily increasing voltage and frequency feed. After attaining the nominal speed, the start-up current is reduced in a controlled manner to the level ne - cessary for normal operation. The frequency converter and the motor of the TURBOVAC have been designed for a minimal drop of speed even at high intake pressures. This ensures the highest possible gas throughput also in the transition range from molecular to viscous flow Depending on the given system and in - stallation conditions, the control unit may be supplemented by a comprehensive range of optional accessories facilitating easy integration within ex - isting installations.
Forevacuum Pump
Since turbomolecular pumps are not capable of compressing directly against atmospheric pressure their operation will always require a sufficiently rated forevacuum pump. For the classic rotor arrangement with rotor blades, generally two-stage rotary vane pumps (TRIVAC) will be suitable. In some cases also single-stage rotary vane vacuum pumps (SOGEVAC BI) or scroll vacuum pumps (SCROLLVAC).In the case of the wide range variant where the rotor is equipped with an additional compression stage (compound stage) also diaphragm vacuum pumps (DIVAC) may be used.
Condition:
AS IS government surplus item.
Picked up from a discontinuing facility in unknown condition.
Photos represent the exact item that will be shipped. Please refer the photos.
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