Pumps – One fluid pumped by contact or entrainment with another – Contact or entrainment within rotary impeller
Patent
1985-11-15
1987-04-14
Croyle, Carlton R.
Pumps
One fluid pumped by contact or entrainment with another
Contact or entrainment within rotary impeller
417313, 417372, 55320, 55350, 55473, 55482, F04C 1900, F04B 3906, B01D 5000
Patent
active
046574875
ABSTRACT:
A device for generating a vacuum comprises a liquid-ring vacuum pump driven by an electric motor and operating with a working fluid. A mixture of compressed air and working fluid from the pump flows to a preseparator which separates a major portion of the working fluid from the gaseous mixture. The separated working fluid is fed from a reservoir in the preseparator via a liquid cooling coil back to the liquid-ring vacuum pump, while the gas still loaded with a residue of the working fluid is fed to a fine separator by means of a gas cooler, working fluid separated in the fine separator being returned to the pump via a return line. The preseparator and the fine separator are physically spaced from one another. The gas cooler and the liquid cooling coil are also physically spaced from one another and are located in the path of the cooling air stream for the electric motor. The coolers are designed so that the gas from the preseparator is cooled to a substantially lower temperature than the temperature to which the working fluid is cooled in the liquid cooling coil.
REFERENCES:
patent: 1991548 (1935-02-01), De Motte
patent: 3156409 (1964-11-01), Paugh
patent: 3291385 (1966-12-01), Williams et al.
patent: 3820923 (1974-06-01), Zweifel
patent: 4083659 (1978-04-01), Schmidt
patent: 4087208 (1978-05-01), Uda et al.
patent: 4257749 (1981-03-01), Ramm
Dipl.-Ing. Helmut Jansen, Oleingespritzte Kompressoren fur technisch olfreie Luft, Oct. 1982, pp. 54-59.
Schmid Norbert
Schonwald Siegfried
Trojahn Hans-Georg
Croyle Carlton R.
Neils Paul F.
Siemens Aktiengesellschaft
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