Chemical solution dispenser apparatus and method of using

• US 4,964,185 A
• Filed: 11/18/1988
• Issued: 10/23/1990
• Est. Priority Date: 01/09/1986
• Status: Expired due to Term

• Current Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Original Assignee: Ecolab, Inc.
• Inventors: Lehn, Chris F.
• Primary Examiner(s): Stinson, Frankie L.
• Application Number:
  US07/273,797
• Time in Patent Office: 704 Days
• Field of Search: 134/93, 222/190, 239/310, 137/268, 8/158, 8/150
• US Class Current: 8/158
• CPC Class Codes: A47L 15/0055 Metering or indication of used products, e.g. type or quantity of detergent, rinse aid or salt; for measuring or controlling the product concentration
• CPC Class Codes: A47L 15/4436 in the form of a detergent solution made by gradually dissolving a powder detergent cake or a solid detergent block
• CPC Class Codes: B01F 21/22 using additional holders in conduits, containers or pools for keeping the solid material in place, e.g. supports or receptacles
• CPC Class Codes: B01F 35/82 by adding a material to be mixed to a mixture in response to a detected feature, e.g. density, radioactivity, consumed power or colour
• CPC Class Codes: Y10T 137/4891 With holder for solid, flaky or pulverized material to be dissolved or entrained

Abstract

An automatic dispenser for dispensing solid chemicals used in cleaning processes which includes (i) means for initiating dispensing of a concentrated chemical solution, (ii) means for forming a concentrated chemical solution, (iii) means for directing the concentrated chemical solution to its utilization point, (iv) means for measuring the conductivity and temperature of the concentrated chemical solution dispensed, (v) means for calculating the amount of chemical dispensed based upon the conductivity and temperature of the concentrated chemical solution dispensed, and (vi) means for terminating formation of the concentrated chemical solution when a predetermined amount of chemical has been dispensed.

Claims

1. A method for dispensing a predetermined quantity of a chemical in a solution of unknown or variable concentration into a utilization vehicle, the solution having a level of conductivity, comprising the steps of:

(a) dispensing the chemical solution into the utilization vehicle at a known constant rate of flow;

(b) measuring the conductivity of the solution as the solution flows into the utilization vehicle;

(c) calculating the amount of chemical dispensed into the utilization vehicle by;

(i) calculating a periodic amount of chemical dispensed into the utilization vehicle after a predetermined time interval based upon the constant solution flow rate, the length of the time interval and the conductivity of the solution; and

(ii) summing the periodic amounts to obtain a total amount of chemical dispensed and comparing the total amount to a predetermined amount of chemical to be dispensed;

(d) periodically repeating steps (b) and (c); and

(e) terminating flow of the solution into the utilization vehicle when said predetermined amount of chemical has been dispensed into the utilization vehicle.

2. The method of claim 1 wherein the chemical is a detergent composition.

3. The method of claim 1 wherein the utilization vehicle is a washing machine.

4. The method of claim 1 further comprising the step of measuring the temperature of the solution as the solution flows into the utilization vehicle and calculating the periodic amount based upon the temperature of the solution.

5. The method of claim 4 wherein the dispensing of the chemical solution into the utilization vehicle is initiated by a control signal from the utilization vehicle.

6. The method of claim 5 wherein a plurality of separate chemicals is dispensed, dispensing of each chemical into the utilization vehicle being initiated by a separate control signals.

7. The method of claim 4 wherein the chemical is a solid placed into solution by impinging a water spray upon the chemical.

8. The method of claim 7 wherein sensing means for measuring the conductivity and temperature continually contact the chemical solution as it flows into the utilization vehicle.

9. The method of claim 4 wherein an electronic control mechanism calculates the amount of chemical dispensed into the utilization vehicle.

10. The method of claim 9 wherein the periodic amount of chemical dispensed into the washing machine is calculated every 1/50 to 1/2 of a second.