Refrigeration – Low pressure cold trap process and apparatus
Patent
1996-04-29
1997-11-18
Capossela, Ronald C.
Refrigeration
Low pressure cold trap process and apparatus
62 32, 165 804, B01D 800
Patent
active
056875754
ABSTRACT:
A miniature thermo-electric cooled cryogenic pump for removing residual water molecules from an inlet sample prior to sample analysis in a mass spectroscopy system, such as ion cyclotron resonance (ICR) mass spectroscopy. The cryogenic pump is a battery operated, low power (<1.6 watts) pump with a .DELTA.T=100.degree. C. characteristic. The pump operates under vacuum pressures of 5.times.10.sup.-4 Torr to ultra high vacuum (UHV) conditions in the range of 1.times.10.sup.-7 to 3.times.10.sup.-9 Torr and will typically remove partial pressure, 2.times.10.sup.-7 Torr, residual water vapor. The cryogenic pump basically consists of an inlet flange piece, a copper heat sink with a square internal bore, four two tier Peltier (TEC) chips, a copper low temperature square cross sectional tubulation, an electronic receptacle, and an exit flange piece, with the low temperature tubulation being retained in the heat sink at a bias angle of 5.degree., and with the TECs being positioned in parallel to each other with a positive potential being applied to the top tier thereof.
REFERENCES:
patent: 3423947 (1969-01-01), Moriya
patent: 3719052 (1973-03-01), White
patent: 4290273 (1981-09-01), Meckler
Capossela Ronald C.
Carnahan L. E.
Regents of the University of California
Sartorio Henry P.
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