Multiplexed system for dispensing multiple chemicals to multiple destinations

• US 5,826,749 A
• Filed: 02/22/1996
• Issued: 10/27/1998
• Est. Priority Date: 02/22/1996
• Status: Expired due to Term

• Current Assignee: Delaware Capital Formation Incorporated (Dover Corporation)
• Original Assignee: Nova Controls
• Inventors: Hosking, Stephen G., Howland, David R., Cassady, Henry W.
• Primary Examiner(s): Huson, Gregory L.
• Application Number:
  US08/605,561
• Time in Patent Office: 978 Days
• Field of Search: 222/57, 222/1, 222/23, 222/145.6, 222/145.7, 222/144.5, 137/88, 137/92, 137/93, 251/7
• US Class Current: 222/1
• CPC Class Codes: B01J 4/008 Feed or outlet control devices
• CPC Class Codes: B67D 7/741 mechanically operated
• CPC Class Codes: D06F 39/022 in a liquid state D06F39/024 takes precedence
• CPC Class Codes: Y10T 137/2509 By optical or chemical property

Abstract

The present invention relates to dispensing chemicals from a multiplexed group of chemicals and delivering the chemicals to a multiplexed set of industrial washers. An input multiplexer operatively couples a selected system input tube to a chemical pump, thereby permitting a selected liquid chemical to be pumped from a chemical container through the chemical delivery system to a selected washer.

Claims

1. A method for dispensing liquids in a system having a first transport means including a pump, a reservoir of chemicals, a collapsible input tube one end of which is in fluid communication with said reservoir, with said remaining end having an aperture in fluid communication with said pump, a chemical flow tube coupled to a water flow tube, with said water flow tube being in fluid communication with a supply of water, said method comprising the steps of:

selectively placing said reservoir in fluid communication with said pump;

transporting a chemical flow from said input tube through said chemical transport means under force of said pump;

transporting a flow of water from said supply of water through said water flow tube;

combining said chemical flow and said flow of water to form a diluted chemical solution; and

transporting said diluted chemical solution through a solution flow tube to a system output tube.

2. The method of dispensing liquid chemicals according to claim 1 further comprising the steps of:

determining an amount of chemical transported through said chemical transport means; and

terminating said transporting of said chemical once a predetermined amount of said chemical has been transported through said chemical transport means.

3. The method of dispensing liquid chemicals according to claim 2 further comprising the step of continuing to transport said water through said system output tube after terminating said transporting of said chemical until substantially all of said predetermined amount of chemical is transported out of said system output tube.

4. The method of dispensing liquid chemicals according to claim 2 further comprising the step of transporting water from said water supply toward said selected system input tube, after said terminating step, until substantially all of said chemical is removed from said chemical transport and said chemical flow tube.

5. The method of dispensing liquid chemicals according to claim 1 further comprising the steps of:

measuring a conductivity of said solution;

measuring a conductivity of said water; and

comparing said solution conductivity and said water conductivity, whereby a difference in said solution conductivity and said water conductivity indicates whether a conductive chemical is present in said solution.

6. The method of dispensing liquid chemicals according to claim 1 further comprising the step of measuring a temperature of said solution.

7. The method of dispensing liquid chemicals according to claim 1 further comprising the step of measuring a flow rate of said water before said step of combining said water with said chemical.

8. The method of dispensing liquid chemicals according to claim 1 further comprising the step of measuring a flow rate of said diluted solution.

9. The method of dispensing liquid chemicals according to claim 1 wherein said step of coupling a chemical transport means to a plurality of input tubes comprises the steps of:

multiplexing said plurality of system input tubes to said chemical transport means;

selecting one of said plurality of system input tubes; and

opening a normally-closed portion of said selected input tube.

10. The method of dispensing liquid chemicals according to claim 9 wherein the step of opening a normally-closed portion of said selected input tube comprises reducing a force pinching said tube.

11. The method of dispensing liquid chemicals according to claim 9 wherein the step of opening a normally-closed tube comprises altering a condition of a valve in said tube.

12. The method of dispensing liquid chemicals according to claim 1 further comprising the steps of:

multiplexing a plurality of system output tubes to a solution transport means;

selecting one of said plurality of system output tubes; and

opening a normally-closed portion of said selected system output tube.

13. The method of dispensing liquids according to claim 1 wherein said selectively placing step includes varying a cross-sectional area of said aperture.

14. A liquid chemical dispensing system for use with a plurality of liquid chemical containers, said system comprising:

a first fluid transport means;

a plurality of system input tubes;

an input multiplexer coupling said plurality of system input tubes to said first transport means, said input multiplexer operatively coupling a selected system input tube to said first transport means, said input multiplexer including a plurality of first multiplexer tubes, at least a portion of each of said first multiplexer tubes capable of being pinched in order to restrict a flow of a chemical in said tube, a plurality of pinchers, each of said pinchers coupled to a corresponding first multiplexer tube, and pinchers pinching said corresponding first multiplexer tube if said corresponding first multiplexer tube is not selected; and

a flow enabler coupled to a pincher corresponding to a selected first multiplexer tube, with each of said pinchers including a spring mechanism, said spring mechanism for establishing a force on said corresponding first multiplexer tube thereby pinching said first multiplexer tube;

a water supply; and

a second fluid transport means coupled to said water supply and to said first fluid transport means, wherein an output of said second fluid transport means comprises a solution of said selected liquid chemical and said water.

15. The liquid chemical dispensing system according to claim 14 further comprising a solution conductivity cell for measuring a conductivity of said solution.

16. The liquid chemical dispensing system according to claim 14 further comprising a water conductivity cell for measuring a conductivity of said water.

17. The liquid chemical dispensing system according to claim 14 further comprising a temperature cell for measuring a temperature of said solution.

18. The liquid chemical dispensing system according to claim 14 wherein said input multiplexer comprises:

a plurality of system input tubes coupled in parallel;

a plurality of three-way input valves, each three-way input valve disposed along a corresponding system input tube;

at least one three-way input-valve connecting tube coupling two three-way input valves.

19. The liquid chemical dispensing system according to claim 14 further comprising a plurality of transport pumps, each of said plurality of transport pumps coupled to said first transport means and to said water supply, wherein an output of each of said transport pumps may be a solution of said selected chemical and said water.

20. The liquid chemical dispensing system according to claim 14 wherein said plurality of chemicals comprises chemicals having a high viscosity.

21. The liquid chemical dispensing system according to claim 15 wherein said first transport means comprises a metering pump.

22. The liquid chemical dispensing system according to claim 14 wherein said second transport means comprises a metering pump.

23. The liquid chemical dispensing system according to claim 14 further comprising an output multiplexer coupling said second fluid transport means to a plurality of system output tubes.

24. The liquid chemical dispensing system according to claim 23 wherein said output multiplexer comprises:

a plurality of two-way output valves, each two-way output valve disposed along a corresponding system output tube; and

a plurality of two-way output-valve input tubes, each two-way output-valve input tube coupled to a corresponding two-way output valve and an output-multiplexer input tube.

25. The liquid chemical dispensing system according to claim 23 wherein said output multiplexer comprises:

a plurality of three-way output valves, each three-way output valve disposed along a corresponding system output tube; and

at least one three-way output-valve connecting tube coupling two three-way output valves.

26. The liquid chemical dispensing system according to claim 25 wherein said plurality of three-way output valves comprises a first three-way output valve coupled to said second transport means.

27. The liquid chemical dispensing system according to claim 25 wherein said plurality of three-way output valves comprises a second three-way output valve coupled to a drain.

28. The liquid chemical dispensing system according to claim 14 wherein said input multiplexer comprises:

a plurality of first multiplexer tubes, at least a portion of each of said first multiplexer tubes capable of being pinched in order to restrict a flow of a chemical in said tube;

a plurality of pinchers, each of said pinchers coupled to a corresponding first multiplexer tube, each of said pinchers pinching said corresponding first multiplexer tube if said corresponding first multiplexer tube is not selected; and

a flow enabler coupled to a pincher corresponding to a selected first multiplexer tube.

29. The liquid chemical dispensing system according to claim 28 wherein each of said pinchers comprises a spring mechanism, said spring mechanism for establishing a force on said corresponding first multiplexer tube thereby pinching said first multiplexer tube.

30. The liquid chemical dispensing system according to claim 28 wherein said input multiplexer comprises a housing.

31. The liquid chemical dispensing system according to claim 30 wherein each of said pinchers comprises:

a pressure plate coupled on a first side to said corresponding first multiplexer tube while said first multiplexer tube is not selected and coupled on a second side to a spring mechanism, said spring mechanism coupled to said housing; and

a rocker arm coupled to said pressure plate and to said housing.

32. The liquid chemical dispensing system according to claim 30 wherein said pinchers are circumferentially disposed about said flow enabler, said flow enabler comprising:

a base capable of rotation;

a pawl arm coupled to said base, said pawl arm comprising a first pawl and a second pawl disposed at opposite ends of said pawl arm respectively.

33. The liquid chemical dispensing system according to claim 30 wherein each of said pinchers comprises:

a pressure plate coupled to said corresponding first multiplexer tube; and

a spring arm coupled to said housing, said spring mechanism pinching said corresponding first multiplexer tube against said pressure plate.

34. The liquid chemical dispensing system according to claim 30 wherein said pinchers are linearly disposed along said flow enabler, said flow enabler comprising:

a lead screw;

a plurality of valve actuators, each coupled to a corresponding spring arm;

a cam coupled to said lead screw, said cam being movable to engage one of said plurality of valve actuators and open said corresponding first multiplexer tube.

35. The liquid chemical dispensing system according to claim 14 wherein said input multiplexer comprises:

a plurality of two-way input valves, each two-way input valve coupled to a corresponding system input tube; and

a plurality of two-way input-valve output tubes, each two-way input-valve output tube coupled to a corresponding two-way input valve and an input-multiplexer output tube.

36. The liquid chemical dispensing system according to claim 35 wherein said input-multiplexer output tube is coupled to said first transport means.

37. The liquid chemical dispensing system according to claim 36 wherein said plurality of three-way input valves comprises a first three-way input valve coupled to said first transport means.

38. The liquid chemical dispensing system according to claim 36 wherein said plurality of three-way input valves comprises a second three-way input valve coupled to a drain.

39. A liquid dispensing system having a reservoir of chemicals and a supply of water, said system comprising:

a first fluid transport means adapted to create a flow of said chemicals;

a system input tube;

an input valve in fluid communication with both said first fluid transport means and said system input tube, with a portion of said input tube adapted to be collapsible and said input valve having a valve element including a pincher positioned proximate to said collapsible end portion, said pincher being resiliently biased to apply a spring force against said collapsible end to selectively pinch-off fluid flow therethrough, with a flow enabler operably coupled to said pincher to selectively reduce said spring force and allow fluid flow through said collapsible end; and

a mixing apparatus coupled to both said water supply and said first fluid transport means, said mixing apparatus being adapted to create a flow of said water and mix said flow of water with said flow of chemicals, defining a dilute chemical flow.

40. The liquid dispensing system according to claim 39 further including a solution conductivity cell for measuring a conductivity of said dilute chemical flow.

41. The liquid chemical dispensing system according to claim 39 further including a water conductivity cell for measuring a conductivity of said flow of water.

42. The liquid chemical dispensing system according to claim 39 further comprising a temperature cell for measuring a temperature of said dilute chemical flow.

43. The liquid chemical dispensing system according to claim 39 wherein said input valve includes a housing and said pincher includes a pressure plate coupled on a first side to said corresponding collapsible end to selectively block fluid flow therethrough, with said pressure plate being coupled on a second side to a spring mechanism, said spring mechanism being coupled to said housing and a rocker arm coupled to said pressure plate and to said housing.

44. The liquid chemical dispensing system according to claim 39 further including a plurality of system input tubes each of which has a collapsible end and a pincher associated therewith, wherein the pinchers associated with said plurality of system input tubes are linearly disposed along said flow enabler, with said flow enabler including a lead screw;

a plurality of valve actuators, each coupled to a corresponding spring arm, and a cam coupled to said lead screw, said cam being movable to engage one of said plurality of valve actuators to selectively compress and decompress one of said plurality of input tubes.

45. The liquid chemical dispensing system according to claim 39 further comprising an output multiplexer and a plurality of system output tubes, with said output multiplexer placing said system output tubes and said mixing apparatus in fluid communication.

46. The liquid chemical dispensing system according to claim 39 wherein said input valve includes a plurality of two-way input valves, each of which is coupled to a corresponding system input tube, and a plurality of two-way input-valve output tubes, each which is coupled to a corresponding two-way input valve and an input-multiplexer output tube.

47. The liquid chemical dispensing system according to claim 39 further including a plurality of system input tubes each of which has a collapsible end and a pincher associated therewith, wherein the pinchers associated with said plurality of system input tubes are circumferentially disposed about said flow enabler.

48. The liquid chemical dispensing system according to claim 47 wherein each of said pinchers includes a pressure plate coupled to said corresponding first multiplexer tube;

and a spring arm coupled to said housing, said spring mechanism pinching said corresponding first multiplexer tube against said pressure plate.