Patent ID: 6581390
Filing Date: 2003-06-24
Classification: F17C

Abstract:
A cryogenic fluid delivery system comprising:a. a storage tank containing a supply of cryogenic liquid; b. a pump including: i) a pumping cylinder having an inlet in communication with said storage tank, an outlet and a pumping piston slidingly positioned therein so that cryogenic liquid from the storage tank is pumped through the pumping cylinder outlet by motion of the pumping piston; ii) an actuating cylinder having an inlet, an outlet and an actuating piston slidingly positioned therein; iii) a connecting rod joining said pumping and actuating pistons; c. a heat exchanger in circuit between the pumping cylinder outlet and the actuating cylinder inlet, said heat exchanger vaporizing a portion of the pumped cryogenic liquid so that said actuating piston is propelled by the resulting cryogenic vapor and said pumping piston is moved by the connecting rod; and d. a liquid delivery line also in communication with the pumping cylinder outlet so that a portion of the pumped cryogenic liquid may be delivered therethrough.