The cryogenic fluid generator includes at least one pump assembly having an actuator mounted to a container assembly. A pump assembly housing includes a longitudinal positioning opening and a pressurization cavity at a distal end terminating with a pump assembly outlet. An internal check valve assem
The cryogenic fluid generator includes at least one pump assembly having an actuator mounted to a container assembly. A pump assembly housing includes a longitudinal positioning opening and a pressurization cavity at a distal end terminating with a pump assembly outlet. An internal check valve assembly includes a shaft positioned within an opening of the pump assembly housing that extends into the pressurization cavity. The shaft is attached to the actuator and includes a longitudinal guidance slot; a fluid passageway; and, an internal sealing surface. A positioning bar assembly is positioned within the guidance slot. A connecting rod is securely connected at a first end to the positioning bar assembly, the connecting rod being positioned within the fluid passageway and terminating with a flow inhibiting element. A seal is positioned between the pump assembly housing and the check valve to provide a closure for the pressurization cavity.
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1. A high pressure cryogenic fluid generator, comprising: a) a container assembly for containing a cryogenic fluid;b) at least one pump assembly, comprising: i. an actuator mounted to said container assembly;ii. a pump assembly housing having a housing opening and being securely attached at a first
1. A high pressure cryogenic fluid generator, comprising: a) a container assembly for containing a cryogenic fluid;b) at least one pump assembly, comprising: i. an actuator mounted to said container assembly;ii. a pump assembly housing having a housing opening and being securely attached at a first end thereof to said container assembly, said pump assembly housing including at least one longitudinal positioning opening, said pump assembly housing having a pressurization cavity formed therein at a distal end terminating with a pump assembly outlet;iii. an internal check valve assembly operatively associated with said pump assembly housing, said internal check valve assembly, comprising: 1. a shaft positioned within said housing opening of said pump assembly housing and having a distal end thereof, said shaft extending into said pressurization cavity, said shaft being fixedly attached at a first end to said actuator, said shaft including a longitudinal guidance slot, said shaft having a fluid passageway formed therein that extends from said longitudinal guidance slot to said distal end, said distal end of said shaft having an internal sealing surface;2. a positioning bar assembly operatively positioned within said longitudinal guidance slot;3. a biasing element supported at a first end by said pump assembly housing and supported at a second end by said positioning bar assembly; and,4. a connecting rod assembly securely connected at a first end to said positioning bar, said connecting rod being positioned within said fluid passageway, said connecting rod assembly terminating with a flow inhibiting element; and,iv. a seal element positioned between said pump assembly housing and said internal check valve assembly to provide a closure for said pressurization cavity; and,c) at least one external check valve in fluid communication with said pump assembly housing outlet for maintaining the fluid pressure provided by said at least one pump assembly,wherein, i) at an initial fill position, said actuator positions said shaft at an upper position in which said positioning bar assembly is biased by said biasing element against a stop portion of said pump assembly housing, and a flow passage is formed allowing cryogenic fluid to flow from said container assembly, through said longitudinal positioning opening of said pump assembly housing, through said longitudinal guidance slot of said shaft, through said fluid passageway of said shaft, through a space formed between said flow inhibiting element and said internal sealing surface, and into said pressurization cavity;ii) at intermediate fill positions said shaft moves in a first direction longitudinally through said pressurization cavity toward said flow inhibiting element;iii) at a shutoff position, said internal sealing surface of said shaft contacts said flow inhibiting element creating a seal therebetween;iv) in a pressurization cycle, said shaft moves longitudinally further through said pressurization cavity compressing the fluid within said pressurization cavity and displacing said fluid through said fluid generator outlet;v) at the beginning of an upstroke, said internal check valve assembly moves in a second, reverse direction in said pressurization cavity until said positioning bar assembly contacts said stop portion of said pump assembly housing;vi) at intermediate parts of the upstroke, said shaft continues to move in said second direction while other portions of said internal check valve assembly remain stationary, thus creating an expanding gap between said flow inhibiting element and said internal sealing surface and allowing fluid to flow into said pressurization cavity; and,vii) at the end of an upstroke, said shaft moves to said initial fill position,wherein filling is provided without loss of sealing engagement of said shaft and said seal element. 2. The high pressure cryogenic fluid generator of claim 1, wherein said at least one pump assembly comprises a pair of pump assemblies. 3. The high pressure cryogenic fluid generator of claim 1, wherein said cryogenic fluid comprises liquid nitrogen. 4. The high pressure cryogenic fluid generator of claim 1, wherein said cryogenic fluid comprises near critical nitrogen. 5. The high pressure cryogenic fluid generator of claim 1, wherein said container assembly comprises a dewar assembly. 6. The high pressure cryogenic fluid generator of claim 1, wherein said actuator comprises a linear actuator. 7. The high pressure cryogenic fluid generator of claim 1, wherein said pump assembly, comprises: a) a structural support assembly having an opening, said structural support assembly being securely attached at a first end thereof to said container assembly;b) a positioning bar housing attached to a second end of said structural support assembly, said positioning bar housing including said at least one longitudinal positioning opening; and,c) an internal check valve assembly housing securely attached to said positioning bar housing, said internal check valve assembly housing having said pressurization cavity formed therein and said fluid generator outlet. 8. The high pressure cryogenic fluid generator of claim 1, wherein said internal sealing surface comprises an internal conical surface. 9. The high pressure cryogenic fluid generator of claim 1, wherein said connecting rod assembly comprises: a) a connecting rod securely connected at a first end to said positioning bar; and,b) a flow inhibiting ball securely connected to a second end of said connecting rod. 10. The high pressure cryogenic fluid generator of claim 1, wherein said seal element comprises a flanged plastic seal element. 11. A high pressure cryogenic fluid generator, comprising: a) a container assembly for containing a cryogenic liquid; and,b) at least one pump assembly, comprising: i. an actuator mounted to said container assembly;ii. a structural support assembly having a support assembly opening, said structural support assembly being securely attached at a first end thereof to said container assembly;iii. a positioning bar housing attached to a second end of said structural support assembly, said positioning bar housing including at least one longitudinal positioning opening;iv. an internal check valve assembly housing securely attached to said positioning bar housing, said internal check valve assembly housing having a pressurization cavity formed therein and a fluid generator outlet;v. an internal check valve assembly operatively associated with said internal check valve assembly housing, said internal check valve assembly, comprising: 1. a shaft positioned within said support assembly opening of said structural support assembly and having a distal end thereof, said shaft being positioned within said positioning bar housing, and concentrically positioned within said pressurization cavity, said shaft being fixedly attached at a first end to said actuator, said shaft including a longitudinal guidance slot, said shaft having a fluid passageway formed therein that extends from said longitudinal guidance slot to said distal end, said distal end of said shaft having an internal conical surface;2. a positioning bar assembly operatively positioned within said longitudinal guidance slot;3. a biasing element supported at a first end by said positioning bar housing and supported at a second end by said positioning bar assembly;4. a connecting rod securely connected at a first end to said positioning bar, said connecting rod assembly being positioned within said fluid passageway; and,5. a flow inhibiting ball securely connected to a second end of said connecting rod; and,vi. a seal element positioned longitudinally between said positioning bar housing and said internal check valve assembly housing, wherein said seal element, said internal check valve assembly, and said positioning bar housing cooperate to provide a closure for said pressurization cavity,wherein, i) at an initial fill position, said linear actuator positions said shaft at an upper position in which said positioning bar assembly is biased by said spring against a stop portion of said structural support assembly, and a flow passage is formed allowing cryogenic fluid to flow from said dewar assembly, through said longitudinal positioning slot of said positioning bar housing, through said longitudinal guidance slot of said shaft, through said fluid passageway of said shaft, through a space formed between said flow inhibiting ball and said conical surface, and into said pressurization cavity of said internal check valve assembly housing;ii) at intermediate fill positions said shaft moves in a first direction longitudinally through said pressurization cavity toward said flow inhibiting ball;iii) at a shutoff position, said conical surface of said shaft contacts said flow inhibiting ball creating a seal therebetween;iv) in a pressurization cycle, said shaft moves longitudinally further through said pressurization cavity compressing the fluid within said pressurization cavity and displacing said fluid through said fluid generator outlet;v) at the beginning of an upstroke, said internal check valve assembly moves in a second, reverse direction in said pressurization cavity until said positioning bar assembly contacts said stop portion of said positioning bar housing;vi) at intermediate parts of the upstroke, said shaft continues to move in said second direction while other portions of said internal check valve assembly remain stationary, thus creating an expanding gap between said flow inhibiting ball and said conical surface and allowing fluid to flow into said pressurization cavity; and,vii) at the end of an upstroke, said shaft moves to said initial fill position,wherein filling is provided without loss of sealing engagement of said shaft and said seal element. 12. The high pressure cryogenic fluid generator of claim 11, wherein said at least one pump assembly comprises a pair of pump assemblies. 13. The high pressure cryogenic fluid generator of claim 12, wherein said flanged seal element comprises a plastic seal element. 14. The high pressure cryogenic fluid generator of claim 12, wherein said cryogenic liquid comprises liquid nitrogen. 15. A high pressure cryogenic fluid generator, comprising: a) a dewar assembly for containing a cryogenic liquid; and,b) at least one pump assembly, comprising: i. a linear actuator mounted to said dewar assembly having a portion thereof extending externally from said dewar assembly and another portion extending internally within said dewar assembly;ii. a structural support assembly having a support assembly opening, said structural support assembly being securely attached at a first end thereof to said dewar assembly;iii. a positioning bar housing attached to a second end of said structural support assembly, said positioning bar housing including at least one longitudinal positioning opening;iv. an internal check valve assembly housing securely attached to said positioning bar housing, said internal check valve assembly housing having a pressurization cavity formed therein and a fluid generator outlet;v. an internal check valve assembly operatively associated with said internal check valve assembly housing, said internal check valve assembly, comprising: 1. a shaft positioned within said support assembly opening of said structural support assembly and having a distal end thereof, said shaft being positioned within said positioning bar housing, and concentrically positioned within said pressurization cavity, said shaft being fixedly attached at a first end to said linear actuator, said shaft including a longitudinal guidance slot, said shaft having a fluid passageway formed therein that extends from said longitudinal guidance slot to said distal end, said distal end of said shaft having an internal conical surface;2. a positioning bar assembly operatively positioned within said longitudinal guidance slot;3. a spring supported at a first end by said positioning bar housing and supported at a second end by said positioning bar assembly;4. a connecting rod securely connected at a first end to said positioning bar; and,5. a flow inhibiting ball securely connected to a second end of said connecting rod; and,vi. a flanged seal element positioned longitudinally between said positioning bar housing and said internal check valve assembly housing, wherein said seal element, said internal check valve assembly, and said positioning bar housing cooperate to provide a closure for said pressurization cavity,wherein, i) at an initial fill position, said linear actuator positions said shaft at an upper position in which said positioning bar assembly is biased by said spring against a stop portion of said structural support assembly, and a flow passage is formed allowing cryogenic fluid to flow from said dewar assembly, through said longitudinal positioning slot of said positioning bar housing, through said longitudinal guidance slot of said shaft, through said fluid passageway of said shaft, through a space formed between said flow inhibiting ball and said conical surface, and into said pressurization cavity of said internal check valve assembly housing;ii) at intermediate fill positions said shaft moves in a first direction longitudinally through said pressurization cavity toward said flow inhibiting ball;iii) at a shutoff position, said conical surface of said shaft contacts said flow inhibiting ball creating a seal therebetween;iv) in a pressurization cycle, said shaft moves longitudinally further through said pressurization cavity compressing the fluid within said pressurization cavity and displacing said fluid through said fluid generator outlet;v) at the beginning of an upstroke, said internal check valve assembly moves in a second, reverse direction in said pressurization cavity until said positioning bar assembly contacts said stop portion of said positioning bar housing;vi) at intermediate parts of the upstroke, said shaft continues to move in said second direction while other portions of said internal check valve assembly remain stationary, thus creating an expanding gap between said flow inhibiting ball and said conical surface and allowing fluid to flow into said pressurization cavity;vii) at the end of an upstroke, said shaft moves to said initial fill position,wherein filling is provided without loss of sealing engagement of said shaft and said seal element. 16. A pump assembly for a high pressure cryogenic fluid generator of a type including a container assembly for containing a cryogenic fluid and at least one external check valve in fluid communication with said pump assembly housing outlet for maintaining the fluid pressure provided by the at least one pump assembly, said pump assembly, comprising: a) an actuator mounted to said container assembly;b) a pump assembly housing having a housing opening and being securely attached at a first end thereof to said container assembly, said pump assembly housing including at least one longitudinal positioning opening, said pump assembly housing having a pressurization cavity formed therein at a distal end terminating with a pump assembly outlet;c) an internal check valve assembly operatively associated with said pump assembly housing, said internal check valve assembly, comprising: i. a shaft positioned within said housing opening of said pump assembly housing and having a distal end thereof, said shaft extending into said pressurization cavity, said shaft being fixedly attached at a first end to said actuator, said shaft including a longitudinal guidance slot, said shaft having a fluid passageway formed therein that extends from said longitudinal guidance slot to said distal end, said distal end of said shaft having an internal sealing surface;ii. a positioning bar assembly operatively positioned within said longitudinal guidance slot;iii. a biasing element supported at a first end by said pump assembly housing and supported at a second end by said positioning bar assembly; and,iv. a connecting rod assembly securely connected at a first end to said positioning bar, said connecting rod assembly being positioned within said fluid passageway, said connecting rod assembly terminating with a flow inhibiting element; and,and,d) a seal element positioned between said pump assembly housing and said internal check valve assembly to provide a closure for said pressurization cavity,wherein, i) at an initial fill position, said actuator positions said shaft at an upper position in which said positioning bar assembly is biased by said biasing element against a stop portion of said pump assembly housing, and a flow passage is formed allowing cryogenic fluid to flow from said container assembly, through said longitudinal positioning opening of said pump assembly housing, through said longitudinal guidance slot of said shaft, through said fluid passageway of said shaft, through a space formed between said flow inhibiting element and said internal sealing surface, and into said pressurization cavity;ii) at intermediate fill positions said shaft moves in a first direction longitudinally through said pressurization cavity toward said flow inhibiting element;iii) at a shutoff position, said internal sealing surface of said shaft contacts said flow inhibiting element creating a seal therebetween;iv) in a pressurization cycle, said shaft moves longitudinally further through said pressurization cavity compressing the fluid within said pressurization cavity and displacing said fluid through said fluid generator outlet;v) at the beginning of an upstroke, said internal check valve assembly moves in a second, reverse direction in said pressurization cavity until said positioning bar assembly contacts said stop portion of said pump assembly housing;vi) at intermediate parts of the upstroke, said shaft continues to move in said second direction while other portions of said internal check valve assembly remain stationary, thus creating an expanding gap between said flow inhibiting element and said internal sealing surface and allowing fluid to flow into said pressurization cavity; and,vii) at the end of an upstroke, said shaft moves to said initial fill position,wherein filling is provided without loss of sealing engagement of said shaft and said seal element.
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