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US 8,136,707 B2Granted
Compensating pressure controller for fluid dispenser and method
AssigneeNordson Corporation
InventorMichael A. Vidal
Life of this patent
Estimating the term…
Abstract
A fluid dispensing system having a fluid dispenser supporting a barrel containing liquid to be dispensed. The barrel has a slidable piston therein with the liquid on a forward piston side and a chamber on a rear piston side. Positive and negative pressure fluid circuits have components operable to apply respective positive and negative fluid pressures to the rear side of the piston. A pressure transducer is operable to sense a fluid pressure in the chamber; and a dispenser control is operative to store a pressure-time relationship during a first dispensing cycle and thereafter, operate a component in the positive pressure fluid circuit to maintain the pressure-time relationship during a subsequent dispensing cycle.
Claims16
A fluid dispensing system for dispensing a liquid, comprising:
- a fluid dispenser supporting a barrel including a piston therein, the barrel including a chamber on a rear side of the piston and a liquid on a forward side of the piston;
- a positive pressure fluid circuit comprising components operable to apply a positive fluid pressure to the rear side of the piston;
- a negative pressure fluid circuit comprising components operable to apply a negative fluid pressure to the rear side of the piston;
- a first pressure transducer operable to sense a fluid pressure in the chamber;
- and
- a dispenser control having an input electrically connected to the first pressure transducer and outputs electrically connected to a component in the positive pressure fluid circuit and to a component in the negative pressure fluid circuit, the dispenser control storing a pressure-time relationship during a first dispensing cycle of the barrel and thereafter, operating the component in the positive pressure fluid circuit to maintain the pressure-time relationship during each subsequent dispensing cycle of the barrel such that the dispensing cycle time is the same for each dispensing cycle.
3 more elements
A fluid dispensing system for dispensing a liquid, comprising:
- a fluid dispenser supporting a barrel including a piston therein, the barrel including a chamber on a rear side of the piston and a liquid on a forward side of the piston;
- a positive pressure fluid circuit comprising components operable to apply a positive fluid pressure to the rear side of the piston;
- a negative pressure fluid circuit comprising components operable to apply a negative fluid pressure to the rear side of the piston;
- a first pressure transducer operable to sense a fluid pressure in the chamber;
- and
- a dispenser control having an input electrically connected to the first pressure transducer and outputs electrically connected to a component in the positive pressure fluid circuit and to a component in the negative pressure fluid circuit, the dispenser control being operative to store a pressure-time relationship during a first dispensing cycle of the barrel and thereafter, operate the component in the positive pressure fluid circuit to maintain the pressure-time relationship during each subsequent dispensing cycle of the barrel;
- wherein the component of the positive pressure fluid circuit coupled to the outlet of the dispenser control comprises a positive pressure regulator.
4 more elements
A fluid dispensing system for dispensing a liquid, comprising:
- a fluid dispenser supporting a barrel including a piston therein, the barrel including a chamber on a rear side of the piston and a liquid on a forward side of the piston;
- a positive pressure fluid circuit comprising components operable to apply a positive fluid pressure to the rear side of the piston;
- a first pressure transducer operable to sense a fluid pressure in the chamber;
- and
- a dispenser control having an input electrically connected to the first pressure transducer and an output electrically connected to a component in the positive pressure fluid circuit, the dispenser control storing a pressure-time relationship during a first dispensing cycle of the barrel and thereafter, operating the component in the positive pressure fluid circuit to maintain the pressure-time relationship during each subsequent dispensing cycle of the barrel such that the dispensing cycle time is the same for each dispensing cycle.
2 more elements
A fluid dispensing system for dispensing a liquid, comprising:
- a fluid dispenser supporting a barrel including a piston therein, the barrel including a chamber on a rear side of the piston and a liquid on a forward side of the piston;
- a positive pressure fluid circuit comprising components operable to apply a positive fluid pressure to the rear side of the piston;
- a first pressure transducer operable to sense a fluid pressure in the chamber;
- and
- a dispenser control having an input electrically connected to the first pressure transducer and an output electrically connected to a component in the positive pressure fluid circuit, the dispenser control being operative to store a pressure-time relationship during a first dispensing cycle of the barrel and thereafter, operate the component in the positive pressure fluid circuit to maintain the pressure-time relationship during each subsequent dispensing cycle of the barrel;
- wherein the component of the positive pressure fluid circuit coupled to the outlet of the dispenser control comprises a positive pressure regulator.
3 more elements
Dependencies are inferred from the claim text.