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Title: Gas centrifuge purge method

Abstract

1. In a method of separating isotopes in a high speed gas centrifuge wherein a vertically oriented cylindrical rotor bowl is adapted to rotate about its axis within an evacuated chamber, and wherein an annular molecular pump having an intake end and a discharge end encircles the uppermost portion of said rotor bowl, said molecular pump being attached along its periphery in a leak-tight manner to said evacuated chamber, and wherein end cap closure means are affixed to the upper end of said rotor bowl, and a process gas withdrawal and insertion system enters said bowl through said end cap closure means, said evacuated chamber, molecular pump and end cap defining an upper zone at the discharge end of said molecular pump, said evacuated chamber, molecular pump and rotor bowl defining a lower annular zone at the intake end of said molecular pump, a method for removing gases from said upper and lower zones during centrifuge operation with a minimum loss of process gas from said rotor bowl, comprising, in combination: continuously measuring the pressure in said upper zone, pumping gas from said lower zone from the time the pressure in said upper zone equals a first preselected value untilmore » the pressure in said upper zone is equal to a second preselected value, said first preselected value being greater than said second preselected value, and continuously pumping gas from said upper zone from the time the pressure in said upper zone equals a third preselected value until the pressure in said upper zone is equal to a fourth preselected value, said third preselected value being greater than said first, second and fourth preselected values.« less

Inventors:
 [1]
  1. Oak Ridge, TN
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
OSTI Identifier:
862486
Patent Number(s):
US 3946942
Assignee:
United States of America as represented by United States Energy (Washington, DC)
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
gas; centrifuge; purge; method; separating; isotopes; speed; vertically; oriented; cylindrical; rotor; bowl; adapted; rotate; axis; evacuated; chamber; annular; molecular; pump; intake; discharge; encircles; uppermost; portion; attached; periphery; leak-tight; manner; cap; closure; means; affixed; upper; process; withdrawal; insertion; enters; defining; zone; removing; gases; zones; operation; minimum; loss; comprising; combination; continuously; measuring; pressure; pumping; time; equals; preselected; value; equal; third; fourth; values; pumping gas; upper zone; process gas; vertically oriented; evacuated chamber; preselected value; separating isotopes; removing gases; closure means; gas centrifuge; cylindrical rotor; continuously pumping; speed gas; selected value; removing gas; continuously measuring; leak-tight manner; /494/

Citation Formats

Theurich, Gordon R. Gas centrifuge purge method. United States: N. p., 1976. Web.
Theurich, Gordon R. Gas centrifuge purge method. United States.
Theurich, Gordon R. Thu . "Gas centrifuge purge method". United States. https://www.osti.gov/servlets/purl/862486.
@article{osti_862486,
title = {Gas centrifuge purge method},
author = {Theurich, Gordon R},
abstractNote = {1. In a method of separating isotopes in a high speed gas centrifuge wherein a vertically oriented cylindrical rotor bowl is adapted to rotate about its axis within an evacuated chamber, and wherein an annular molecular pump having an intake end and a discharge end encircles the uppermost portion of said rotor bowl, said molecular pump being attached along its periphery in a leak-tight manner to said evacuated chamber, and wherein end cap closure means are affixed to the upper end of said rotor bowl, and a process gas withdrawal and insertion system enters said bowl through said end cap closure means, said evacuated chamber, molecular pump and end cap defining an upper zone at the discharge end of said molecular pump, said evacuated chamber, molecular pump and rotor bowl defining a lower annular zone at the intake end of said molecular pump, a method for removing gases from said upper and lower zones during centrifuge operation with a minimum loss of process gas from said rotor bowl, comprising, in combination: continuously measuring the pressure in said upper zone, pumping gas from said lower zone from the time the pressure in said upper zone equals a first preselected value until the pressure in said upper zone is equal to a second preselected value, said first preselected value being greater than said second preselected value, and continuously pumping gas from said upper zone from the time the pressure in said upper zone equals a third preselected value until the pressure in said upper zone is equal to a fourth preselected value, said third preselected value being greater than said first, second and fourth preselected values.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1976},
month = {1}
}

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