Pumps – Successive stages – Reciprocating rigid stages
Patent
1987-06-17
1988-12-20
Neils, Paul F.
Pumps
Successive stages
Reciprocating rigid stages
417511, 417901, 417DIG1, 92144, 92170, 92172, F04B 300, F04B 1508
Patent
active
047922893
ABSTRACT:
In a reciprocating pump for cryogenic fluids comprising a pump cylinder in which a piston is oscillatingly displaceable in a sealed state, an inlet valve and an outlet valve, and an annular channel surrounding the pump cylinder on the outer side and forming an outlet for the cryogenic fluid delivered by the pump, in order to attain optimum sealing at the operating temperatures, without the piston motion being impeded at higher temperatures, it is proposed that the cylinder be made of a material with good sliding and self-lubricating properties and a thermal expansion coefficient which is larger than that of the piston, that the dimensions of the cylinder and the piston be so selected that the piston sealingly contacts the inside wall of the cylinder at operating temperature, and that the outlet valve be arranged at the downstream end of the annular channel.
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Gottzman, C. F., High Pressure Liquid-Hydrogen and -Helium Pumps AICE, Adces in Cryogenic Engineering, vol. 5, 1960, pp. 289-298.
Schweizerische Bauzeitung, Jul. 4, 1963, pp. 496-497.
Deutsche Forschungs -und Versuchsanstalt fur Luft -und Raumfahrt
Neils Paul F.
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