Metering pump for dispensing liquid

B - Operations – Transporting – 67 – D

Patent

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Details

B67D 1/10 (2006.01) B67D 7/30 (2010.01) B67D 7/58 (2010.01) F04B 13/00 (2006.01)

Patent

CA 2668931

A pump for metering a liquid is disclosed comprising a flexible tube connected to a container with a pressure relief valve located in the flexible tube. A housing defines an aperture for receiving the flexible tube with a compression surface located adjacent to the aperture. A reciprocating member has a sealing element and a pumping element. A drive moves the sealing element for pinching the flexible tube against the compression surface upstream from the pressure relief valve for trapping liquid between the sealing element and the pressure relief valve. The drive moves the pumping element for collapsing the flexible tube against the compression surface for pumping the trapped liquid to discharge a metered quantity of the liquid from the pressure relief valve.

La présente invention concerne une pompe permettant de doser un liquide et comprenant un tube souple raccordé à un récipient pourvu d'une soupape de décharge située dans le tube souple. Un carter définit une ouverture permettant de recevoir le tube souple, en ménageant une surface de compression située à côté de l'ouverture. Une navette comporte un élément obturateur et un élément de pompe. Un entraînement déplace l'obturateur de façon à pincer le tube souple contre la surface de compression en amont de la soupape de décharge, piégeant ainsi le liquide entre la partie obturante et la soupape de décharge. L'entraînement déplace l'élément de pompe de façon à écraser le tube souple contre la surface de compression, pompant ainsi le liquide piégé afin d'en décharger une quantité mesurée par la soupape de décharge.

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