Importance

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Abstract

A peristaltic pump wherein an annular internal surface of the housing and a sleeve-like annular section of an elastically deformable diaphragm define an annular pumping chamber which communicates with the fluid-admitting inlet and with the fluid-discharging outlet of the housing. The diaphragm is provided with an extension which projects radially outwardly from the sleeve-like section and is partially anchored in a socket of the housing. A weakened portion of the extension between the anchored portion and the sleeve-like section is received in a compartment between the inlet and outlet of the housing and is provided with one or more empty or fluid-filled cavities, with one or more recesses, with one or more holes and/or other elasticity enhancing features to ensure that the resistance of the sleeve-like section to deformation will be uniform in each of its parts including that which is integral with the extension. This reduces the likelihood of vibration when the pump is in use, namely when a piston is caused to roll along the internal surface of the sleeve-like section to thereby draw fluid into the pumping chamber by way of the inlet and expel fluid from the chamber by way of the outlet. The sleeve-like section has an annular internal rib which extends with play into a circumferentially complete groove in the peripheral surface of the piston.

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First Claim