High pressure spherical piston
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorVernon D. Burklund
Life of this patent
Estimating the term…
Abstract
A spherical piston for high-pressure applications. By shifting the o-ring oove to the pressure side of the major diameter of a spherical piston such that one edge of the groove is the major diameter, a very close fitting spherical piston that will not have metal to metal interference is created. Contrary to traditional spherical pistons, the spherical diameter of the present invention is less than the diameter of a cylinder wall. Elimination of metal to metal interference between the piston and the cylinder wall permits the piston to be made of harder metal than the cylinder wall without concern for damage if the piston cants on its axis within the cylinder.
Claims14
A high pressure single-acting spherical piston assembly comprising:
- a block with a cylindrical opening of predetermined diameter for containing pressurized fluid;
- a reciprocating spherical piston with a major diameter and a single-acting side within said cylindrical opening for working with said fluid to perform a predetermined task with said contained pressurized fluid and where said spherical piston has a spherical diameter equal to said major diameter but less than the diameter of said cylindrical opening;
- and
- an o-ring placed in an o-ring groove on said spherical piston parallel to the major diameter of said spherical piston for closing a diametrical clearance equal to the difference between said cylinder diameter and said piston major diameter where said o-ring is on the single-acting side of said spherical piston such that one side of said o-ring groove forms a portion of the major diameter of said spherical piston such that said spherical piston can rock within said cylindrical opening without physical contact between said piston and said block.
A high pressure single-acting spherical piston assembly comprising:
- an aluminum block with a cylindrical walled opening of predetermined diameter for containing pressurized fluid;
- a reciprocating steel spherical piston with a major diameter and a single-acting side within said cylindrical walled opening for working with said fluid to perform a predetermined task with said contained pressurized fluid and where said spherical piston has a spherical diameter equal to said major diameter but less than the diameter of said cylindrical walled opening;
- and
- an o-ring placed in an o-ring groove on said spherical piston parallel to the major diameter of said spherical piston for closing a diametrical clearance equal to the difference between said cylinder diameter and said piston major diameter where said o-ring is on the single-acting side of said spherical piston such that one side of said o-ring groove forms a portion of the major diameter of said spherical piston such that said spherical piston can rock within said cylindrical opening without physical contact between said piston and said block.
Dependencies are inferred from the claim text.