VOLUMETRIC PUMP COMPRISING A DRIVING MECHANISM
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Accused Products
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.
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Citations
22 Claims
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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.
Specification