Product dispensing system

• US 8,087,303 B2
• Filed: 08/28/2009
• Issued: 01/03/2012
• Est. Priority Date: 09/06/2007
• Status: Active Grant

• Current Assignee: Deka Products Limited Partnership
• Original Assignee: Deka Products Limited Partnership
• Inventors: Beavis, Russell H.
• Primary Examiner(s): THOMPSON, JEWEL VERGIE
• Application Number:
  US12/549,778
• Publication Number:
  US 20100005903A1
• Time in Patent Office: 858 Days
• Field of Search: 737/72, 737/35, 737/28, 7386147-86152, 137/486, 417/415
• US Class Current: 73/861.47
• CPC Class Codes: B67D 1/0036 based on the timed opening of valves
• CPC Class Codes: B67D 1/0855 concerning the used flowmeter flowmeter per se G01F1/00, G01F3/00
• CPC Class Codes: B67D 1/0888 Means comprising electronic circuitry (e.g. control panels, switching or controlling means)
• CPC Class Codes: B67D 2210/00034 Modules
• CPC Class Codes: B67D 2210/0006 Manifolds
• CPC Class Codes: G01F 1/34 by measuring pressure or differential pressure
• CPC Class Codes: G01F 1/56 by using electric or magnetic effects G01F1/66 takes precedence
• CPC Class Codes: G01F 1/662 Constructional details
• CPC Class Codes: G01F 23/804 containing circuits handling parameters other than liquid level
• CPC Class Codes: G01F 3/10 Geared or lobed impeller meters
• CPC Class Codes: G01F 3/20 having flexible movable walls, e.g. diaphragms, bellows
• CPC Class Codes: G05D 7/0617 specially adapted for fluid materials
• CPC Class Codes: Y10T 137/7722 Line condition change responsive valves
• CPC Class Codes: Y10T 137/7759 Responsive to change in rate of fluid flow
• CPC Class Codes: Y10T 137/85978 With pump

Abstract

A flow sensor includes a fluid chamber configured to receive a fluid. A diaphragm assembly is configured to be displaced whenever the fluid within the fluid chamber is displaced. A transducer assembly is configured to monitor the displacement of the diaphragm assembly and generate a signal based, at least in part, upon the quantity of fluid displaced within the fluid chamber.

Claims

1. A flow sensor comprising:

a fluid chamber configured to receive a fluid micro-ingredient from a product container;

a diaphragm assembly configured to be displaced whenever the fluid within the fluid chamber is displaced;

a transducer assembly configured to monitor the displacement of the diaphragm assembly and generate a signal; and

a control logic subsystem in communication with a transducer assembly, the control logic subsystem configured to receive the signal from the transducer assembly and ascertain the quantity of fluid passing through the chamber,

wherein the control logic subsystem determines, based on the signal, whether the product container contains a volume of fluid micro-ingredient or whether the product container is empty.

2. The flow sensor of claim 1 wherein the transducer assembly comprising a linear variable differential transformer coupled to the diaphragm assembly by a linkage assembly.

3. The flow sensor of claim 1 wherein the transducer assembly comprising a needle/magnet cartridge assembly.

4. The flow sensor of claim 1 wherein the transducer assembly comprising a magnetic coil assembly.

5. The flow sensor of claim 1 wherein the transducer assembly comprising a Hall Effect sensor assembly.

6. The flow sensor of claim 1 wherein the transducer assembly comprising a piezoelectric buzzer element.

7. The flow sensor of claim 1 wherein the transducer assembly comprising a piezoelectric sheet element.

8. The flow sensor of claim 1 wherein the transducer assembly comprising an audio speaker assembly.

9. The flow sensor of claim 1 wherein the transducer assembly comprising an accelerometer assembly.

10. The flow sensor of claim 1 wherein the transducer assembly comprising a microphone assembly.

11. The flow sensor of claim 1 wherein the transducer assembly comprising an optical displacement assembly.

12. A method for determining a product container is empty comprising:

energizing a pump assembly;

pumping a micro-ingredient from a product container;

displacing a capacitive plate a displacement distance;

measuring the capacitance of a capacitor;

calculating the displacement distance from the measured capacitance; and

determining whether the product container is empty.

13. A method for determining a product container is empty comprising:

energizing a pump assembly;

displacing a diaphragm assembly a displacement distance by pumping a micro ingredient from a product container;

measuring the displacement distance using a transducer assembly;

using the transducer assembly generating a signal based, at least in part, upon the quantity of micro-ingredient pumped from the product container; and

determining, using the signal, whether the product container is empty.