Volumetric pump with bi-directional sphincter seal

Details Volumetric pump with bi-directional sphincter seal Volumetric pump with bi-directional sphincter seal

F - Mech Eng,Light,Heat,Weapons

04

B

F04B 53/16 (2006.01) A61M 5/142 (2006.01) F16J 15/32 (2006.01)

Patent

CA 2227859

A volumetric pump comprises a housing having an elongate cavity with open and closed ends. A resilient sheet of material having two branched portions forming an aperture is disposed over the housing. A pump shaft is slidably disposed through the aperture such that one branched portion toward the cavity and the other branched portion extends away from the housing such that a sphincter seal is formed about the shaft. An inlet conduit leading from a fluid source passes through the housing into the cavity near one end thereof, and an outlet conduit leading to a fluid sink passes through the housing from the cavity near the other end thereof. The shaft is driven back and forth in reciprocating motion, to alternatively produce a positive pressure forcing fluid out of the outlet conduit to the fluid sink, and a negative pressure forcing fluid from the fluid source through the inlet conduit.

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