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US 5,348,451 AGranted
Pump apparatus
AssigneeFramo Developments (UK) Limited
InventorFrank Mohn
Life of this patent
Estimating the term…
Abstract
A pumping apparatus has a linear electric motor (10; 40) reciprocally driving motor pistons (16; 45) hydraulically coupled with pump pistons (25) or with coupling pistons (51) mechanically connected with pump pistons (61) which move the fluid to be pumped. For undersea use, the coupling arrangements allow convenient separation and retrieval of subassemblies requiring relatively frequent servicing.
Claims21
A pump apparatus comprising:
- a pump piston reciprocably movable within a pump cylinder to increase and decrease a first drive space within the pump cylinder and to decrease and increase a pump space within the pump cylinder,
- check valve means controlling the inflow into the pump space and discharge therefrom of a fluid to be pumped,
- a drive piston reciprocably movable within a drive cylinder to increase and decrease the volume of a second drive space within the drive cylinder,
- motor means reciprocably driving the drive piston, a duct communication the first and second drive spaces,
- an hydraulic fluid filling said first and second drive spaces and said duct, and
- means in said duct permitting selective hydraulic separation of said drive and pump cylinders.
3 more elements
A pump apparatus comprising:
- a pump piston reciprocably movable in a pump cylinder for introduction into said pump cylinder and discharge therefrom of a fluid to be pumped,
- a motor piston reciprocably movable in a motor cylinder for introduction into said motor cylinder and discharge therefrom of an hydraulic coupling fluid,
- drive means operable to effect said reciprocable movement of said motor piston,
- coupling means drivingly coupling said motor piston with said pump piston, said coupling means including a duct and hydraulic fluid movable in said duct, and
- means in said duct for selective interruption of said hydraulic fluid movement.
2 more elements
A pump apparatus comprising:
- a linear electric motor having a reciprocable drive member,
- first and second drive pistons mounted at opposed ends of said drive member for reciprocation therewith within respective first and second drive cylinders,
- first and second pump pistons reciprocably movable within first and second pump cylinders respectively,
- coupling means containing hydraulic fluid drivingly connecting said first and second drive pistons with said first and second pump pistons respectively, said coupling means including piping communicating between said first drive and pump cylinders and between said second drive and pump cylinders, and means in said piping permitting interruption of said communication between at least one of said first drive and pump cylinders and said second drive and pump cylinders.
1 more element
A pump apparatus comprising:
- a linear electric motor having a reciprocable drive member,
- first and second drive pistons mounted at opposed ends of said drive member for reciprocation therewith within respective first and second drive cylinders,
- first and second pump pistons reciprocably movable within first and second pump cylinders respectively,
- coupling means containing hydraulic fluid drivingly connecting said first and second drive pistons with said first and second pump pistons respectively, said coupling means comprises first and second intermediate pistons reciprocably movable within respective first and second intermediate cylinders, means mechanically connecting said first and second intermediate pistons with said first and second pump pistons respectively, hydraulic coupling means coupling said first and second intermediate pistons with said first and second drive pistons respectively, and means permitting selective interruption of said hydraulic coupling means.
1 more element
A pump apparatus comprising:
- a linear electric motor having a reciprocable drive member,
- first and second drive pistons mounted at opposed ends of said drive member for reciprocation therewith within respective first and second drive cylinders,
- first and second pump pistons reciprocably movable within first and second pump cylinders respectively, and
- coupling means containing hydraulic fluid drivingly connecting said first and second drive pistons with said first and second pump pistons respectively, and means permitting selective interruption of said hydraulic coupling means, said drive cylinders having different diameters from said pump cylinders, whereby said drive pistons reciprocate through distance different from the distance through which said pump pistons reciprocate.
1 more element
Dependencies are inferred from the claim text.