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A fluid delivery system for dispensing precisely metered quantities of a fluid, and more particularly, a fluid delivery system incorporating a diaphragm pump for effectuation of the precise control over the dispensing of a metered quantity of the fluid through the formation of a fluid flow-occluding

A fluid delivery system for dispensing precisely metered quantities of a fluid, and more particularly, a fluid delivery system incorporating a diaphragm pump for effectuation of the precise control over the dispensing of a metered quantity of the fluid through the formation of a fluid flow-occluding air bubble at the point of discharge inhibiting the formation of droplets tending to adversely influence the accuracy of the system. Also disclosed is a method for delivering and dispensing precisely metered quantities of a fluid through the utilization of the system.

대표청구항 ▼

A method for the dispensing of precisely metered quantities of a fluid of a predetermined viscosity, comprising pumping quantities of a fluid from a fluid supply through a conduit towards a discharge nozzle; effecting said pumping by selectively applying a vacuum and a superatmospheric pressure to a

A method for the dispensing of precisely metered quantities of a fluid of a predetermined viscosity, comprising pumping quantities of a fluid from a fluid supply through a conduit towards a discharge nozzle; effecting said pumping by selectively applying a vacuum and a superatmospheric pressure to a fluid pump an controlling the flow of said fluid by operatively interconnecting a first and second valve and said selective pressure application for aspirating predetermined quantities of fluid from said fluid supply to a pumping arrangement, said fluid pumping arrangement including a diaphragm pump having a flexible diaphragm, said diaphragm separating said pump into a fluid delivery chamber communicating with said conduit intermediate said first and second valves, and into a working chamber responsive to the application of said selective pressure, said diaphragm pump aspirating said fluid from said fluid supply and conducting a quantity of said fluid to said nozzle commensurate with the combined volume of said delivery and working chambers; and thereafter conveying said fluid quantities from said pumping arrangement to said nozzle and wherein a correlation in the physical relationship between the properties of the fluid and the internal flow diameter and material of said nozzle consisting of the parameter of (1) the tip geometry of said nozzle; (2) the material of said nozzle; (3) the volume of fluid pumped; (4) the viscosity of the fluid being pumped; (5) the flow velocity of said fluid; and (6) the surface tension between the fluid and said conduit causes the formation of a fluid flow-occluding air bubble in said nozzle upon termination of discharge of fluid from said nozzle to inhibit discharge of residual droplets of said fluid.