Patent ID: 7007866
Filing Date: 2006-03-07
Classification: A01M,A61L,F04B

Abstract:
1. A metering device for conveying small quantities of a liquid substance into an application space, comprising: a reservoir for holding the liquid substance to be conveyed, said reservoir having a liquid substance filling level above which a gas space is maintained; a diaphragm micropump communicating with said reservoir; a pump chamber disposed between said reservoir and the application space, said pump chamber having a volume varied by activity of said diaphragm micropump; said pump chamber and said reservoir being connected by a first orifice; a second orifice connecting said pump chamber to the application space, said second orifice acting as a nozzle in a direction from said pump chamber towards the application space; and a gaseous component of the liquid substance located in said reservoir is released in small quantities to said air space above said filling level in said reservoir said first orifice acting as a nozzle in a direction from said reservoir to said pump chamber and being disposed above said filling level of the substance in said reservoir for conveying said gaseous component of the liquid substance from said air space in said reservoir.