Patent ID: 9599101
Date: 2017-03-21
CPC Classifications: F04B

Claim:
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.