초록 ▼

A cryogenic pump is disclosed for pumping liquified gas from one container to another container or a point of use. The pump comprises a series of chambers and coupling valves for progressively pumping a liquified gas from an inlet end located within and adjacent to the bottom of the container to an

A cryogenic pump is disclosed for pumping liquified gas from one container to another container or a point of use. The pump comprises a series of chambers and coupling valves for progressively pumping a liquified gas from an inlet end located within and adjacent to the bottom of the container to an outlet conduit. The pump arrangement allows the container to be substantially emptied thereby avoiding waste of the contained liquified gas.

대표청구항 ▼

A submersible cryogenic pump for transferring liquified gas from a container comprising: an inner housing having a longitudinal axis, an inner wall, an inlet end and a discharge end; an outer housing surrounding the inner housing; a reciprocating piston slideably positioned within the inner housing

A submersible cryogenic pump for transferring liquified gas from a container comprising: an inner housing having a longitudinal axis, an inner wall, an inlet end and a discharge end; an outer housing surrounding the inner housing; a reciprocating piston slideably positioned within the inner housing along the longitudinal axis for dividing the inner housing into a supercharger chamber and a sump chamber, the moveable piston having a skirt in sliding engagement with the inner wall of the housing, the volume of the supercharger and sump chambers changing inversely as the reciprocating piston is moved toward and away from the discharge end; a fixed piston extending within the sump chamber in sliding engagement with the reciprocating piston skirt to form a high pressure chamber between the reciprocating and fixed pistons; a liquified gas inlet; a precharge chamber within the outer housing in fluid communication with the inlet end of the inner housing; a one-way sump chamber valve connecting the liquified gas inlet at the pump discharge end to the sump chamber to allow liquified gas to enter the sump chamber when the reciprocating piston is moved away for the discharge end; a one-way precharge chamber valve connecting the sump chamber to the precharge chamber to allow liquid to enter the precharge chamber when the reciprocating piston is moved toward the discharge end; a one-way supercharger chamber valve connecting the precharge chamber to the supercharger chamber to allow liquified gas to enter the supercharger chamber when the reciprocating piston is moved toward the discharge end; a one-way high pressure chamber valve connecting the supercharger chamber to the high pressure chamber when the moveable piston is moved away from the discharge end; an outlet for the pressurized liquified gas, and a one-way discharge valve connecting the high pressure chamber to the outlet when the reciprocating piston is moved toward the discharge end.