Cryogenic pumps

摘要

A cryogenic pump has an associated heater for vaporizing cryogenic fluid. The heater has a chamber (bounded by an inner sleeve and an outer sleeve) disposed around at least a portion of the pump housing. The heater has a helical heating coil with a plurality of turns disposed within the chamber and a helical baffle having a plurality of turns interspaced with the turns of the heating coil for guiding heat exchange fluid over the turns of the heat exchange coil. The heater has an inlet for cryogenic fluid to communicate with the heat exchange coil and an outlet for the resulting vaporized fluid. Heat exchange fluid flows through an inlet of the heater chamber to an outlet of the heater chamber and then through a space defined between the inner sleeve and a portion of the pump housing.

主权项

1. A cryogenic pump for pumping a cryogenic fluid has associated therewith a heater for vaporizing the cryogenic fluid, the heater comprising:
(a) a heater chamber bounded by an inner sleeve and an outer sleeve and disposed around at least a portion of a pump housing enclosing a piston shaft; (b) a helical heat exchange coil having a plurality of turns disposed within said heater chamber; (c) an inlet with cryogenic fluid communicating with said heat exchange coil; (d) an outlet for resulting vaporized fluid communicating with said heat exchange coil; (e) an inlet to said heater chamber for a heat exchange fluid; and (f) an outlet from said heater chamber for said heat exchange fluid to flow out from said heater chamber to a space defined between said inner sleeve and said portion of said pump housing;wherein said heater chamber has a helical baffle having a plurality of turns for guiding said heat exchange fluid over said turns of said heat exchange coil, said turns of said baffle being interspaced with said turns of said heat exchange coil.