(19)
(11) EP 0 322 908 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
09.05.1990 Bulletin 1990/19

(43) Date of publication A2:
05.07.1989 Bulletin 1989/27

(21) Application number: 88121836.6

(22) Date of filing: 28.12.1988
(51) International Patent Classification (IPC)4: F17C 5/02
(84) Designated Contracting States:
DE FR GB IT SE

(30) Priority: 30.12.1987 US 139390

(71) Applicant: Lawless, James C.
Summit New Jersey 07901 (US)

(72) Inventor:
  • Lawless, James C.
    Summit New Jersey 07901 (US)

(74) Representative: Patentanwälte Hauck, Graalfs, Wehnert, Döring, Siemons 
Neuer Wall 41
20354 Hamburg
20354 Hamburg (DE)


(56) References cited: : 
   
       


    (54) Fluorocarbon pumping system


    (57) A system and method for pumping liquid fluorocarbons and the like from a pressurized supply container (24) to another container (26). The system compensates for the inherent vapor pressure drop occuring within any pressurized container of fluorocarbons as the fluorocarbons are pumped out. A phase conversion apparatus is provided to recirculate a portion (32) of the liquid being pumped from the downstream side of the pump (22), through a phase conversion chamber (12) into the supply tank (24) in a vapor phase. This prevents a vapor pressure drop in the supply tank and avoids the flashing of the liquid into a gas at the discharge connection of the supply container. The invention also comprises an improved fluorocarbon gear pump (22) and pressure regulation means (82). The gear pump utilizes offset gear axes and porous gears to form a liquid film over the gears to prevent deleterious contact in the pump and extend useful pump life.







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