VOLUMETRIC PUMP WITH RECIPROCATED AND ROTATED PISTON

• US 20090053086A1
• Filed: 08/12/2005
• Published: 02/26/2009
• Est. Priority Date: 11/29/2004
• Status: Active Grant

• Current Assignee: Swissinnov Product SARL
• Original Assignee: Swissinnov Product SARL
• Inventors: Navarro, Thierry
• Granted Patent: US 7,887,308 B2
• Time in Patent Office: Days
• US Class Current: 417/493
• CPC Class Codes: F04B 19/022 reciprocating cylinders
• CPC Class Codes: F04B 7/06 the pistons and cylinders being relatively reciprocated and rotated
• CPC Class Codes: F04B 9/02 the means being mechanical
• CPC Class Codes: F04B 9/04 the means being cams, eccentrics or pin-and-slot mechanisms

Abstract

A volumetric pump (1) comprising a piston (2) and a cylindrical chamber (3), contains an inlet port (10) and an outlet port (11). Said piston (2) is actuated by a rotor (5) bearing an eccentric shaft (6). The shaft (6), being connected to the piston (2), causes said piston to slide back and forth inside the cylinder chamber (3) while having a bidirectional angular movement. The instroke of the piston (2) sucks a fluid (15) from the inlet port (10) through a first channel (12) into the pump chamber (3), said fluid being propelled through a second channel (13) to the outlet port (11) during the outstroke of the piston (2). The inlet (10) and outlet port (11) are opened and closed alternatively by the bidirectional angular movement of said piston (2) which acts as a valve for the said inlet and outlet ports (10, 11).

Claims

1. A volumetric pump comprising at least one first piston inside a first hollow cylindrical part, said pump having at least one inlet port through which a liquid can be sucked into at least one pump chamber during an instroke of said piston, and at least one outlet port through which the liquid can be expelled during the outstroke of the piston, characterized in that at least one second piston is positioned opposite to the first piston inside a second hollow cylindrical part, both cylindrical parts being assembled end-to-end facing each other to form a housing, an element preferably a disc being mounted midway inside said housing, said element, which comprises the inlet and outlet ports, being arranged to be animated by a preferably combined bidirectional linear and angular movement to cause relative to-and-fro sliding between the cylindrical housing and the pistons along the axis of said pistons while closing the inlet and outlets ports synchronically to ensure a continuous flow delivery.

2. A volumetric pump according to claim 1, characterized in that the first and second pistons are fixedly positioned inside the housing, said housing being slidable following the axis of the two pistons.

3. A volumetric pump according to claim 1, characterized in that the housing is fixed, while the first and second pistons are slidable inside said housing.

4. A volumetric pump according to claim 2, characterized in that the element is arranged to be animated by a bidirectional linear movement.

5. A volumetric pump according to claim 2, comprising means to dissociate the linear movement of the housing or the pistons from the angular movement of the element.

6. A volumetric pump according to claim 5 comprising a first rotor for imparting relative linear movement to the housing or the pistons and a second rotor for independently imparting an angular movement to the element.

7. A volumetric pump according to claim 1, wherein said pistons, disc and housing are disposables.

15. A compressor comprising a tank that is sealed tight to the outlet port of a volumetric pump according to claim 1.

17. A volumetric pump according to claim 3, characterized in that the element is arranged to be animated by a bidirectional linear movement.

18. A volumetric pump according to claim 3, comprising means to dissociate the linear movement of the housing or the pistons from the angular movement of the element.

8. A volumetric pump comprising a piston in a cylindrical chamber, said chamber having an open upper end, an inlet port and an outlet port, said piston being actuated by at least one rotor, characterized in that a shaft is operatively connected either directly to the piston, said shaft comprising a spherical extremity clipable into a receptable adjacent to the top part of said piston, or indirectly through a piston head adaptable to an end part of the piston, to cause said piston to slide back and forth inside the cylinder chamber while having a bidirectional angular movement, providing an instroke of the piston for sucking a fluid from the inlet port through a first channel into the pump chamber, followed by an outstroke of said piston for propelling the fluid through a second channel to the outlet port, the inlet and outlet port being opened and closed alternately by the bidirectional angular movement of said piston which acts as a valve for said inlet and outlet ports.

9. A volumetric pump according to claim 8, wherein the alternate opening and closing of said inlet and outlet ports are either in synchronization with the suction and expulsion phases of the volumetric pump or at anytime during the stroke of said piston.

10. A volumetric pump according to claim 9, wherein said channels are curved to ensure a flow of the liquid alternately from the inlet port to the chamber during the instroke of the piston and from said chamber to the outlet during the outstroke of the outstroke of the piston.

11. A volumetric pump according to claim 8, wherein said piston and cylindrical chamber are disposables.

12. A volumetric pump according to claim 8, wherein several specific gaskets or standard O'"'"'rings are positioned around said inlet port and outlet port.

13. A volumetric pump according to claim 8, wherein said piston and cylindrical chamber are injection molded parts.

14. A volumetric pump according to claim 8, wherein said shaft is mounted on a spring.

16. A compressor comprising a tank that is sealed tight to the outlet port of a volumetric pump according to claim 8.

19. A volumetric pump according to claim 9, wherein said piston and cylindrical chamber are disposables.

20. A volumetric pump according to claim 10, wherein said piston and cylindrical chamber are disposables.