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BOC Edwards Turbomolecular Pump, US $469 – Picture 0
BOC Edwards Turbomolecular Pump, US $469 – Picture 0

Boc Edwards Turbomolecular Pump

US $469

  • Spring Valley, California, United States
  • Jun 9th
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BOC Edwards EXT 255 HVi Turbomolecular Pump - 60 Day Warranty. Original Packaging. Manufacturer Refurbished. Never used after refurbish. Code: NXB2-04-000 S/N: 006478679 Year: 2000 Wt: 6.0Kg The Edwards EXT turbomolecular and compound molecular pumps provide a reliable, hydrocarbon-free high and ultra high vacuum. Utilizing multi-stage axial flow turbines combined with magnetic and ceramic bearings, the EXT design provides oil and vibration free operation with minimal maintenance on high critical foreline pressure processes. The EXT255H, EXT255Hi and EXT255HV ipumps are compound vacuum pumps that combine a turbomolecular pump and a drag pump on a single shaft. The turbomolecular pump is made from a multi-stage axial-flow turbine which is optimised for operation in molecular flow conditions. The drag pump is made from pumping channels formed by helical grooves. The drag pump is designed for operation at higher pressures than conventional turbomolecular pumps. The light alloy rotor is machined from one piece to form the angled blades of the turbomolecular pump. The rotor blades rotate between angled stator blades which are supported by spacer rings. The rotor and stator blades have an open structure at the pump inlet, and a more closed structure at the outlet. This configuration gives an optimum combination of pumping speed and compression when pumping gases of both high and low molecular weight. For the blades to be effective, their speed must be close to the thermal velocity of the gas. The rotor therefore rotates at up to 60000 r min-1. Gas from the inlet is compressed through each of the bladed stages of the turbomolecular pump and transferred to the drag pump. In the drag pump stages, the gas is further compressed as it is pumped around the channels formed by the helical grooves. The rotating assembly is supported at the inlet end by a frictionless magnetic bearing and by a precision ceramic ball bearing at the outlet end. The ball bearing is lubricated from an oil reservoir and wick mechanism.

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