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Edwards EXT Series turbo molecular pump
Published:2015-02-09 14:42:15    Text Size:【BIG】【MEDIUM】【SMALL
Summary:The EXT series pumps are compound vacuum pumps that combine a turbomolecular pump and a drag pump on a single shaft.

The EXT series pumps 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 plane rotating disks. 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 and the disks of the drag 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 of the EXT70H/Hi therefore rotates at up to 90000 r min-1, and the rotor of the EXT250H/Hi 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 separation of the disks. The inlet and outlet of each channel is separated by a close-running seal which diverts the gas through a port to the next channel, or to the pump outlet.


GX is the professional sales and repair the Edwards EXT series pumps,welcome to inquire.