Sealing method and arrangement for turbine compressor and laser

Details Sealing method and arrangement for turbine compressor and laser Sealing method and arrangement for turbine compressor and laser

1993-06-04

1994-12-27

Bovernick, Rodney B.

Coherent light generators

Particular active media

Gas

277 343, 277 29, 415113, H01S 3036, F16J 1546, F04B 3904

Patent

active

053772164

ABSTRACT:
A turbine-type compressor useful in a gas laser apparatus for flowing gas along a flow path of the laser includes a sealing arrangement about a drive shaft of the compressor for preventing undesirable substances from moving to the compressor impeller along the drive shaft of the compressor and contaminating the laser gas compressed thereby. The sealing arrangement includes a first seal, preferably a vacuum pressure seal, for sealing about the shaft at least during rotation of the shaft, and a second seal comprising a resilient bladder which is selectively expanded and contracted to move into and out of sealing contact with the drive shaft, respectively, for, on one hand, sealing against the shaft when the drive shaft is stationary during pumping down of the laser and, on the other hand, withdrawing the bladder from the shaft when the shaft is rotating. The sealing arrangement is reliable and relatively low cost and uses less gas than a prior art sealing arrangement.

REFERENCES:
patent: 2752175 (1956-06-01), Fletcher
patent: 3338583 (1967-08-01), Isdale
patent: 4068852 (1978-01-01), Anglade
patent: 4135698 (1979-01-01), Thate et al.
patent: 4198064 (1980-04-01), Huhn
patent: 4729724 (1988-03-01), Henning et al.
patent: 4817111 (1989-03-01), Nilsen et al.
patent: 5192083 (1993-03-01), Jones, Jr. et al.

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