Hybrid nutating pump

• US 7,451,687 B2
• Filed: 12/29/2005
• Issued: 11/18/2008
• Est. Priority Date: 12/07/2005
• Status: Expired due to Fees

• Current Assignee: Gardner Denver Thomas Incorporated (Gardner Denver Incorporated)
• Original Assignee: Thomas Industries, Inc.
• Inventors: Lynn, William Harry, Razek, Roy
• Primary Examiner(s): Lazo; Thomas E
• Application Number:
  US11/275,402
• Publication Number:
  US 20070128051A1
• Time in Patent Office: 1,055 Days
• Field of Search: 914/99, 92/122, 92/71, 92181 R-181 P, 417/269, 417/550, 74/60, 748/39
• US Class Current: 92/12.2
• CPC Class Codes: F04B 1/146 Swash plates; Actuating elements
• CPC Class Codes: F04B 1/2078 Swash plates
• CPC Class Codes: F04B 27/086 swash plate
• CPC Class Codes: F04B 27/1054 Actuating elements
• CPC Class Codes: F04B 27/1072 Pivot mechanisms
• CPC Class Codes: Y10T 74/18336 Wabbler type

Abstract

A nutating pump for creating pressure or a vacuum. The nutating pump includes a housing with a center support positioned within said housing. The center support includes a semi-spherical recess. The pump also includes a drive shaft adapted to be connected to an electric motor and an eccentric adapted to be connected to the drive shaft. The pump further includes a ball adapted to form a ball joint and is adapted to be positioned within the semi-spherical recess of said center support. In addition the pump includes a nutating yoke positioned within the housing. The yoke includes a semi-spherical recess adapted to accept said pivot ball. The nutating yoke is adapted to be connected to the eccentric, such that rotation of the eccentric causes the yoke to move about the ball. The pump also includes a connecting rod connected to the yoke, a piston connected to the connecting rod and a cylinder adapted to accept the piston, wherein the movement of the yoke about the ball causes the piston to reciprocate within the cylinder.

Claims

1. A nutating pump for creating pressure or a vacuum, said nutating pump comprising:

a housing;

a center support positioned within said housing, said center support including a semi-spherical recess;

a drive shaft adapted to be connected to an electric motor;

an eccentric adapted to be connected to said drive shaft;

a ball adapted to form a ball joint and to be positioned within said semi-spherical recess of said center support;

said center support includes a plurality of prongs to assist in retaining the position of said ball;

a nutating yoke positioned within said housing, said yoke having a semi-spherical recess adapted to accept said pivot ball;

said nutating yoke adapted to be connected to said eccentric, such that rotation of said eccentric causes said yoke to move about said ball;

a connecting rod connected to said yoke;

a piston connected to said connecting rod;

a cylinder adapted to accept said piston; and

wherein movement of said yoke about said ball causes said piston to reciprocate within said cylinder.

2. The nutating pump of claim 1, wherein said pump includes a guide rod.

3. The nutating pump of claim 2, wherein said yoke includes a retention slot that is adapted to slidably engage said guide rod to prevent rotation of said yoke about said ball joint.

4. The nutating pump of claim 1, wherein said piston includes a valve adapted to permit gas to enter said cylinder through said piston.

5. The nutating pump of claim 1, wherein said cylinder includes apertures adapted to permit gas to exit said cylinder.

6. The nutating pump of claim 1, wherein said nutating pump includes a valve head.

7. The nutating pump of claim 6, wherein said valve head includes a one piece gasket having a plurality of sealing surface to for independent sealed chambers.

8. The nutating pump of claim 7, wherein said gasket includes a plurality of elastomeric valves.

9. The nutating pump of claim 8, wherein said elastomeric valves are adapted to permit gas to exit said cylinders.

10. The nutating pump of claim 8, wherein said piston includes a plurality of apertures adapted to permit gas to flow through said piston.

11. The nutating pump of claim 10, wherein said piston includes an annular groove that is in fluid communication with said plurality of apertures.

12. The nutating pump of claim 1 further comprising a ball between said connecting rod and an arm of said nutating yolk;

and an elastomeric member coupling said arm to said connecting rod.

13. A nutating pump for creating pressure or a vacuum, said nutating pump comprising:

a housing;

a center support positioned within said housing, said center support including a semi-spherical recess;

a drive shaft adapted to be connected to an electric motor;

an eccentric adapted to be connected to said drive shaft;

a ball adapted to form a ball joint and to be positioned within said semi-spherical recess of said center support;

a nutating yoke positioned within said housing, said yoke having a semi-spherical recess adapted to accept said pivot ball;

said yoke is pivotally connected to said eccentric by an eccentric pin having a tapered side;

said nutating yoke adapted to be connected to said eccentric, such that rotation of said eccentric causes said yoke to move about said ball;

a connecting rod connected to said yoke;

a piston connected to said connecting rod;

a cylinder adapted to accept said piston; and

wherein movement of said yoke about said ball causes said piston to reciprocate within said cylinder.

14. A piston for use in a compressor comprising:

a head portion having a first side, a second side and a perimeter;

a base portion connected to said head portion;

a seal connected to and extending beyond the perimeter of said head portion;

said seal is a cup seal and said cup seal is retained on said piston by way of a retainer clip;

a plurality of apertures extending through said head portion, said apertures adapted to permit gas to pass from said first side to said second side of said head portion;

an annular groove in fluid communication with said apertures; and

a valve connected to said piston, said valve adapted to selectively permit gas to pass through said apertures.

15. The piston of claim 14 wherein said retainer clip includes a plurality of fingers that are biased to engage said piston.

16. The piston of claim 14 wherein said piston includes a centralized aperture.

17. A piston for use in a compressor comprising:

a centralized aperture;

a head portion having a first side a second side and a perimeter;

a base portion connected to said head portion;

a seal connected to and extending beyond the perimeter of said head portion;

a plurality of apertures extending through said head portion,

said apertures adapted to permit gas to pass from said first side to said second side of said head portion;

an annular groove in fluid communication with said apertures;

a valve connected to said piston, said valve adapted to selectively permit gas to pass through said apertures; and

said valve includes a flexible shaft adapted to be positioned within said centralized aperture.

18. The piston of claim 17 wherein said flexible shaft includes a retaining member to secure said valve to said piston.

19. The piston of claim 18 wherein said retaining member is in the form of an enlarged portion of said flexible shaft.

20. A piston for use in a compressor comprising:

a head portion having a first side a second side and a perimeter;

a base portion connected to said head portion;

a seal connected to and extending beyond the perimeter of said head portion;

at least one passageway extending through said head portion, said at least one passageway adapted to permit gas to pass from said first side to said second side of said head portion;

an aperture extending through said head portion of said piston;

a valve connected to said piston, said valve having a flexible shaft adapted to be positioned within said aperture;

a retainer in the form of an enlarged portion of said flexible shaft, said retainer adapted to retain said valve to said piston.