Fluid dispenser with positive displacement pump
AssigneeNordson Corporation
InventorMario Romanin
Life of this patent
Estimating the term…
Abstract
Fluid dispensing apparatus uses positive displacement of the fluid for accurate metering of the quantity of liquid applied to a surface. Positive displacement includes a metering volume that is filled and emptied so that each cycle corresponds to an accurate volume of material dispensed independent of viscosity. In one embodiment, a positive displacement pump is used with a variable speed air motor. The air motor drives the pump. A variable output air regulator supplies air pressure to run the air motor based on a position signal. A profile may be used to relate position with motor speed and to control quantity to be dispensed.
Claims23
Fluid dispensing apparatus, comprising:
- a positive displacement pump having an inlet connectable to a supply of fluid to be dispensed and an outlet, said positive displacement pump comprising a piston pump with a metering volume defined by a piston chamber of said pump;
- a dispensing head having a flow path in fluid communication with said pump outlet,
- a porous web of material through which the fluid is applied to a surface;
- said dispensing head supporting said porous web of material;
- said flow path being unobstructed from said pump outlet to said porous web without a valve in said flow path, wherein said dispensing head pivots about a first axis and comprises means to restrict pivoting about another axis.
Fluid dispensing apparatus, comprising:
- a positive displacement pump having an inlet connectable to a supply of fluid to be dispensed and an outlet, said positive displacement pump comprising a piston pump with a metering volume defined by a piston chamber of said pump;
- an air motor operatively coupled to said pump;
- said air motor comprises a variable speed motor and wherein quantity of fluid dispensed is a function of said air motor speed;
- a dispensing head having a flow path in fluid communication with said pump outlet,
- a porous web of material through which the fluid is applied to a surface;
- said dispensing head supporting said porous web of material;
- said flow path being unobstructed from said pump outlet to said porous web without a valve in said flow path.
Dependencies are inferred from the claim text.