Systems and methods for detecting and eliminating leaks in water delivery systems for use with appliances

• US 20060027267A1
• Filed: 07/26/2005
• Published: 02/09/2006
• Est. Priority Date: 07/26/2004
• Status: Abandoned Application

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Fritze, Karl
• Application Number:
  US11/189,547
• Publication Number:
  US 20060027267A1
• Time in Patent Office: Days
• US Class Current: 137/487.500
• CPC Class Codes: F17D 5/02 Preventing, monitoring, or locating loss
• CPC Class Codes: F25C 2400/14 Water supply
• CPC Class Codes: F25D 23/126 Water cooler
• CPC Class Codes: G01M 3/2807 for pipes G01M3/2892, G01M3/30 take precedence
• CPC Class Codes: G05D 7/0635 by action on throttling means G05D7/0688, G05D7/0694 take precedence
• CPC Class Codes: Y10T 137/7761 Electrically actuated valve

Abstract

Apparatus and methods for detecting and eliminating water flow leakage conditions within appliances having integral water filtration systems. Leak free water delivery systems for use with an appliance can include an isolation valve and flow sensor for providing a response mechanism for possible water leakages within the integral water filtrations system. The appliance makes use of a flow sensor to sense water flow rates within a preselected flow range. When water flow rates outside the preselected flow range are sensed, the isolation valve is closed to prevent non-transient water flow through the water system. The isolation valve can be remotely located on an inlet line or can be as a part of the integral water filtration system. The integral water filtration system can include a manual or automatic reset mechanism such that a user can restore water flow after a low flow or high flow situation has been rectified.

Claims

1. An appliance comprising an integral water system and a leak detecting and eliminating device, the device comprising:

a flow sensor operatively positioned to measure an inlet flow rate to the integral water system and generate a signal related to a measured inlet flow rate;

an isolation valve operatively positioned to selectively allow or stop inlet water flow to the integral water system; and

a control unit operatively interconnected to the flow sensor and the isolation valve, the control unit comprising a control processor that compares the measured inlet flow rate from the signal generated by the flow sensor to a preselected flow range defined by a lower limit flow rate and an upper limit flow rate, and that directs the isolation valve to a closed configuration when the measured inlet flow rate is outside the preselected flow rate range.

2. The appliance of claim 1, wherein the control unit and the flow sensor comprise a single, integral flow component.

3. The appliance of claim 1, wherein the control unit is selected from the group comprising:

a microprocessor, a PLC and a relay-logic circuit.

4. The appliance of claim 1, wherein the control unit further comprises:

a reset mechanism for resetting the integral water system, the reset mechanism operatively directing the control element to position the isolation valve in an open configuration so as to restore inlet flow to the integral water system.

5. The appliance of claim 4, wherein the reset mechanism comprises a manually initiated switch, the manually initiated switch being operatively connected to the control unit.

6. The appliance of claim 1, wherein the integral water system comprises a distribution manifold and a removable water filter, the distribution manifold and removable water filter defining a filtration circuit between a manifold inlet and a manifold outlet.

7. The appliance of claim 6, wherein the flow sensor is operatively, fluidly positioned within the filtration circuit.

8. The appliance of claim 6, wherein the control element is operatively, mounted to the distribution manifold.

9. The appliance of claim 1, wherein the flow sensor comprises a paddle wheel flow sensor and the isolation valve comprises a solenoid valve.

10. The appliance of claim 1, wherein the control unit comprises a sound emitter that emits an audible signal when the flow comparison between the inlet flow rate and the preselected flow range indicates the presence of a leak.

11. The appliance of claim 1, wherein the control unit comprises a display that provides a visual signal when the flow comparison between the inlet flow rate and the preselected flow range indicates the presence of a leak.

12. The appliance of claim 1, further comprising:

a diverter valve assembly for selectively directing water flow to one of a plurality of points-of-use.

13. The appliance of claim 1, further comprising:

a second flow sensor positioned downstream of the flow sensor, the second flow sensor operatively positioned to measure a downstream flow rate from the integral water system and generate a signal related to a measured downstream flow rate, the second flow sensor operatively interconnected to the control unit wherein the control unit compares the measured inlet flow rate from the signal generated by the flow sensor to the measured downstream flow rate from the signal generated by the second flow sensor wherein the control unit directs the isolation valve to a closed configuration when a system leak is identified by having the measured inlet flow rate and measured downstream flow rate being generally unequal for a non-transient period of time.

14. The appliance of claim 1, wherein the appliance is selected from the group consisting of a refrigerator, a coffee maker, a dishwasher, a washing machine, a humidifier, a water softener and a beverage dispenser.

15. The appliance of claim 1, wherein the control unit receives an external input indicative of whether a water flow is requested through the integral water system and wherein the control unit compares the external input to the measured inlet flow rate to selectively allow or stop inlet water flow to the integral water system.

16. A method for eliminating water system leakages within an appliance comprising:

measuring an inlet flow rate to a water system with a flow sensor; and

comparing with a flow processor, the inlet flow rate to a preselected operational flow range defined by an operational flow rate lower limit and an operational flow rate upper limit wherein an isolation valve is closed when the inlet flow rate falls outside the preselected operational flow range.

17. The method of claim 16, further comprising:

resetting the water filtration system after a system leakage event has been resolved, wherein the isolation valve is opened such that water is allowed water to enter the water filtration system.

18. The method of claim 16, wherein the flow sensor comprises a paddlewheel flow sensor and the isolation valve comprises a solenoid valve.

19. The method of claim 16, wherein the water system comprises a replaceable filter.

20. A refrigerator comprising:

a refrigeration compartment;

a water system having a replaceable filter element, wherein at least a portion of a flow path of the water system passes through the refrigeration compartment;

a flow sensor operatively positioned to measure inlet flow to the filter element and generate a signal indicative of the inlet flow;

an isolation valve operatively positioned to measure an inlet flow rate to the filter element; and

a control unit operatively connected to the flow sensor and isolation valve, the control unit comprising a control processor that compares the measured inlet flow from the signal from the flow sensor to a preselected flow range defined by an allowable flow rate lower limit and an allowable flow rate upper limit, and that directs the isolation valve to a closed configuration when a system leak is identified by having the measured inlet flow fall outside the preselected flow range.