VOLUMETRIC PUMP COMPRISING A DRIVING MECHANISM

• US 20090196775A1
• Filed: 05/14/2007
• Published: 08/06/2009
• Est. Priority Date: 06/02/2006
• Status: Active Grant

• Current Assignee: Swissinnov Product SARL
• Original Assignee: Nomet Management Services B.V.
• Inventors: Navarro, Thierry
• Granted Patent: US 8,353,688 B2
• Time in Patent Office: Days
• US Class Current: 417/460
• CPC Class Codes: F04B 19/022 reciprocating cylinders
• CPC Class Codes: F04B 7/0007 and having a rotating movement
• CPC Class Codes: F04B 9/047 the means being pin-and-slot mechanisms

Abstract

A volumetric pump comprises at least one piston inside a cylindrical housing and means to cause a relative to-and-fro linear movement between the cylindrical housing and the piston in order to produce a stroke of the volumetric pump. This pump further comprises a bi-directional angular rotatable disc acting as a valve which connects alternately at least one inlet port and at least one outlet port to a least one pump chamber located inside the housing, and a driving mechanism arranged to dissociate at least partially the bi-directional angular movement of the rotatable disc with the to-and-fro linear movement of the housing. This driving mechanism is arranged such that the rotatable disc reaches an angular position at which it opens and/or closes the inlet and/or outlet ports when there is no relative to-and-fro linear movement between the cylindrical housing and the piston.

Claims

1-14. -14. (canceled)

15. A volumetric pump comprising on the one hand at least one piston inside a cylindrical housing and means to cause a relative to-and-fro linear movement between the cylindrical housing and the piston in order to produce a stroke of the volumetric pump and on the other hand a preferably bi-directional angular rotatable element acting as a valve which connects alternately at least one inlet port and at least one outlet port to at least one pump chamber located inside the housing, and a driving mechanism that is arranged to dissociate at least partially the bi-directional angular movement of the element with the relative to-and-fro linear movement between the housing and the piston, the driving mechanism being arranged such that the rotatable element opens and/or closes the inlet and/or outlet ports when it reaches an angular position at which there is no or substantially no relative to-and-fro linear movement between the cylindrical housing and the piston, wherein the driving mechanism comprises a rotatable member having an eccentric shaft, one of whose ends is adapted to transmit the bi-directional angular movement to the rotatable element of the volumetric pump so as to open and close appropriately the inlet and outlet ports of said volumetric pump, the driving mechanism further comprising at least one connecting-piece connected at or near to the other end of the shaft, such that said piece is adapted to convert indirectly the rotary motion of the rotatable member into a bi-directional linear movement of the housing of the volumetric pump along the axis of the pistons.

16. A volumetric pump according to claim 15, wherein the bi-directional linear movement of the housing transmitted by the connecting-piece of the driving mechanism is transmitted through a pump cage to a support, the latter being slidably mounted inside the pump cage, said support being adapted to receive the volumetric pump.

17. A volumetric pump according to claim 16, wherein the pump cage and the support of the driving mechanism are arranged so that there is a lateral play between said cage and said support in order to delay the sliding movement of the housing to ensure no pumping movement of the volumetric pump during the opening and/or the closing of the inlet and outlet ports.

18. A volumetric pump according to claim 15, comprising a first fixed piston inside a first hollow cylindrical part and a second fixed piston 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 the housing, the rotatable element being mounted midway inside the housing, said rotatable element being movable with a bi-directional angular movement such that it acts as a valve connecting on the one hand the inlet port alternately to a first and second chamber into which a fluid can be sucked through a first channel during a pump instroke and connecting on the other hand an outlet port alternately to said first and second chamber where the fluid can be expelled through a second channel during a pump outstroke, said pump instroke and outstroke being produced by the linear sliding movement of the housing along the pistons.

19. A volumetric pump according to claim 15, wherein the driving mechanism comprises a single rotor transmitting through a transmission belt an angular movement to a pulley which is connected around the rotatable member.

20. A volumetric pump according to claim 19, wherein the pulley of the driving mechanism has a circular shape.

21. A volumetric pump according to claim 19, wherein the pulley of the driving mechanism has an elliptical shape.

22. A driving mechanism for a volumetric pump according to claim 15, comprising a rotatable member having an eccentric shaft one of whose ends is adapted to transmit the bi-directional angular movement to the rotatable element and a connecting-piece connected at or near the other end of the shaft, said piece converting indirectly the rotary motion of the rotatable member into a bi-directional linear movement of the housing of the volumetric pump along the axis of the pistons.