Spin pump with spun-epicyclic geometry having piston bores capped with caps including ducts or valves within the rotor
View Patent ↗The subject matter described herein relates to a spin pump that includes a combination of a compressor and a vacuum pump on respective pistons extending from a common crankshaft in a rotating housing. Related methods, apparatuses, systems, techniques and articles are also described.
1. A pump system with a compressor pump and a vacuum pump on a common shaft, comprising: a rotor that rotates about a first axis, the rotor having a first and a second radial piston bore each sized to contain at least one piston, wherein the first radial piston bore can serve as a vacuum pump and the second radial piston bore can serve as a compressor pump, said first and second radial piston bores being capped with caps including ducts or valves that are adjacent to the first and second radial piston bores within the rotor; a crankshaft defining a second axis parallel to and offset from the first axis, wherein the crankshaft rotates about the second axis and drives rotation of the rotor; wherein a first piece and a second piece mate to collectively form the rotor, wherein the first piece includes a first tongue and a second tongue that define a first space and a second space between the first tongue and the second tongue, and wherein the second piece includes a third tongue and a fourth tongue, and wherein the third tongue and the fourth tongue are positioned within the first space and the second space when the first piece and second piece are mated together; wherein the first radial piston bore extends at least partially through the first tongue and the second tongue, and the second radial piston bore extends at least partially through the third tongue and the fourth tongue.
2. A pump system as in claim 1 , wherein each of the first and second pieces of the rotor forms a cylindrical portion of one of the first or second radial piston bores.
3. A pump system as in claim 1 , wherein the first and second pieces are congruent.
4. A pump system as in claim 1 , wherein the first piece of the rotor includes an entirety of the first piston bore that contains a piston and the second piece of the rotor includes an entirety of the second piston bore that contains a second piston.
5. A pump system as in claim 1 , wherein there is a radial gap between the rotor and the housing of 0.0005-0.003 inch.
6. A pump system as in claim 1 , wherein the first and second pistons comprise solid lubricant at interfaces between the piston and the rotor.
7. A pump system as in claim 1 , wherein the pump includes two or more operative part surfaces, and wherein all operative part surfaces of the pump at least one of flat and cylindrical.
8. A pump system as in claim 7 , wherein the operative part surfaces are parallel or orthogonal to one another.
9. A pump system as in claim 1 , further comprising a housing containing the rotor, wherein the housing includes one or more ports that communicate with the piston bores.
10. A pump system as in claim 9 , wherein the ports eliminate a need for valves.
11. A pump system as in claim 9 , wherein the ports are axially offset from one another to avoid cross-connection between fluid flow of the compressor pump and the vacuum pump.
12. An oxygen concentrator comprising the pump system as defined by claim 1 .
13. An oxygen concentrator as in claim 12 , wherein the oxygen concentrator is portable.
14. An oxygen concentrator as in claim 12 , wherein the pump is kinematically balanced.
15. A pump system as in claim 1 , further comprising at least one valve coupled to one of the piston bores.
16. A pump system as in claim 15 , wherein the valve is mounted on a piston head of the at least one piston.
17. A pump system as in claim 1 , wherein the first radial piston bore of the rotor contains a first single-piece, double-ended piston and the second radial piston bore of the rotor contains a second single-piece, double-ended piston.