Clean in place system

• US 4,848,381 A
• Filed: 02/05/1988
• Issued: 07/18/1989
• Est. Priority Date: 02/13/1987
• Status: Expired due to Term

• Current Assignee: Diverseylever Incorporated (Unilever PLC)
• Original Assignee: Diversey Limited (Sealed Air)
• Inventors: Warner, Thomas J., Moreland, Gary D., Cassady, Henry W. Jr., Livingston, James W., Hosking, Stephen G.
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Reinckens, Corinne M.
• Application Number:
  US07/152,877
• Time in Patent Office: 529 Days
• Field of Search: 134/57 R, 134/95, 134/98, 134/100, 134/102, 134/169 R, 366/152, 366/153, 62/303, 68/207, 137/240, 141/89, 141/90, 141/91, 141/95, 141/83, 222/148
• US Class Current: 134/57.00R
• CPC Class Codes: A23G 7/00 Other apparatus or process specially adapted for the chocolate or confectionery industry
• CPC Class Codes: A23G 9/30 Cleaning; Keeping clean; Sterilisation
• CPC Class Codes: B67D 1/07 Cleaning beverage-dispensing apparatus B67D1/0834, B67D1/0837 take precedence
• CPC Class Codes: Y10T 137/4259 With separate material addition

Abstract

A system for cleaning cone/shake makers in place. Cone/shake makers have at least one freezer for making ice cream cones or milk shakes. Each freezer has a product inlet, a product pump for pumping product from the inlet into the freezer, and at least one draw valve for dispensing the product in the freezer. The cleaning system has a mixing tank for mixing water with a cleansing chemical, the mixing tank having a capacity of less than one-fourth the volume of the water and cleansing chemical mixture to be used while cleaning a cone/shake maker. The system controllably provides the cleansing chemical to the mixing tank at a rate corresponding to the rate at which water flow into the mixing tank, thereby making a cleansing chemical solution of predefined concentration on the fly as the mixture is being used to clean the cone/shake maker. The system monitors the conductivity of the water/cleansing solution and generates an error message if the conductivity falls outside a specified range for at least a threshold period of time, thereby providing the user with a warning that the system is having a chemical dispensing problem. The cleaning system includes a draw valve actuator for each of cone/shake maker'"'"'s draw valves and a controller for opening and closing these draw valves in accordance with a specified schedule.

Claims

1. A cleaning system for a fluid product dispenser, said dispenser having means for supplying fluid product to a dispensing valve, said cleaning system comprising:

(i) a mixing tank for containing treatment solutions;

(ii) means for delivering pressurized treatment solutions from said mixing tank to the fluid product supply means;

(iii) means for actuating the dispensing valve to open and close the dispensing valve where said actuating means is responsive to valve open/close signals;

(iv) means for controlling said cleaning system, said control means generating said valve open/close signals to open and close the dispensing valve a multiplicity of times in accordance with a predefined sequence to release intermittently the pressurized treatment solutions from the fluid product supply means through the dispensing valve.

2. A cleaning system of claim 1 wherein the dispenser includes a dispensing draw valve which is coupled to a flavor supply line to supply a correspondingly flavored fluid product, said cleaning system includes status means for communicating information to the user of said cleaning system, means for pumping rinse/treatment solutions from said mixing tank into the flavor supply line, said pump means including a pressure switch generating a pressure signal indicating whether the solution pressure in the flavor supply line exceeds a predefined pressure limit, said control means includes means for generating an error message on said status means if (a) said pressure signal indicates that the flavor line pressure is below said limit for at least a threshold period of time while the draw valve is closed, or (b) said pressure signal indicates that the line pressure is above said limit for at least a threshold period of time while the draw valve is open, whereby said cleaning system can warn the user of said cleaning system that a flavor line requires repair.

3. A cleaning system of claim 1 wherein said cleaning system includes means for mixing treatment solutions in said mixing tank on the fly, said mixing means including

a water inlet which maintains a substantially constant liquid level in said mixing tank by letting water flow into said mixing means as treatment solutions are removed from said mixing means by said delivery means,

means for measuring the amount of water which flows into said mixing tank, and

means for supplying treatment chemicals to said mixing tank substantially contemporaneously with the flow of water into said mixing tank, the quantity of supplied treatment chemicals being proportional to the amount of water which flows into said mixing tank so as to maintain a predefined concentration level of treatment chemicals in said mixing tank.

4. A cleaning system of claim 3 further including a conductivity probe in said mixing tank for generating a conductivity signal corresponding to the conductivity of the fluid in said mixing tank, wherein said control program, during cleansing tasks, compares said conductivity signal with an allowed conductivity range, and generates an error signal if said conductivity signal is not within said allowed range for at least a threshold period of time.

5. A cleaning system for cleaning a cone/shake dispenser, said dispenser having means for supplying fluid product to a dispensing valve, including at least one freezer, each freezer having a product inlet, a product pump for pumping product into the freezer, the dispensing valve being a draw valve which when opened dispenses product from the freezer, said cleaning system comprising:

(i) a mixing tank for containing treatment solutions;

(ii) means for delivering treatment solutions from said mixing tank to the fluid product supply means;

(iii) means for actuating the dispensing valve to open and close the dispensing valve where said actuating means is responsive to valve open/close signals;

(iv) means for controlling said cleaning system, said control means generating said valve open/close signals to open and close the dispensing valve a multiplicity of times in accordance with a predefined sequence to release intermittently the treatment solutions from the fluid product supply means through the dispensing valve;

said delivery means delivering the treatment solutions to the product pump, said control means generating product pump on/off signals to which the product pump is responsive, said control means supplying pressurized treatment solutions in said at least one freezer by generating said product pump on signal.

6. A cleaning system of claim 5 wherein the cone/shake dispenser includes a plurality of shake dispensing draw valves, each coupled to a separate syrup supply line and a common shake freezer, said cleaning system includes separate draw valve actuating means for opening and closing each of said shake dispensing draw valves, said control means including means for generating during rinsing and cleansing tasks, separate said valve open/close signals for opening and closing each said shake dispensing draw valves in accordance with a specified schedule, whereby each draw valve can be opened separately in accordance with said predefined sequence so that the full pressure developed by the shake freezer'"'"'s product pump is separately applied to each draw valve.

7. A cleaning system of claim 5, wherein said system includes model identifying means for identifying the configuration of a cone/shake dispenser, including the number of freezers and the number of shake dispensing draw valves coupled to the shake freezer, if any, in the cone/shake dispenser;

wherein each shake dispensing draw valve is coupled to a separate syrup supply line and a common shake freezer;

the number of said draw valve actuating means exceeds the number of draw valves on at least one cone/shake dispenser configuration that can be cleaned by said system; and

a plurality of pumps for pumping fluid from said mixing tank into syrup supply lines;

at least one of said pumps including means for preventing fluid from being pumped therethrough if said pump is not attached to a syrup supply line;

each said pump including a pressure switch for generating a pressure signal indicating whether the pressure on the corresponding syrup line exceeds a predefined pressure limit;

said control means including assigning means for separately activating each said draw valve actuating means and then monitoring said pressure signals to determine if said draw valve actuating means is coupled to one of said draw valves, and to find the corresponding syrup line pump;

said control program thereby assigning one draw valve actuating means and one pump to each shake dispensing draw valve associated with the configuration of the cone/shake dispenser;

means for generating separate draw valve open and close signals for each assigned draw valve actuating means, for opening and closing each shake dispensing draw valve, in accordance with a specified schedule;

whereby said cleaning system can clean cone/shake dispensers having a plurality of different configurations.

8. A cleaning system for a cone/shake dispenser having at least one freezer, each freezer having a product inlet, a product pump for pumping product from the product inlet into the freezer, and at least one draw valve for dispensing the product in the freezer, comprising:

water and chemical supply means for routing water from a water supply to a cone/shake dispenser'"'"'s product pump, including means for routing plain water to the dispenser'"'"'s product pump during rinse cycles, and for adding cleansing chemicals to water drawn from a water supply and then routing the resulting cleansing solution to the dispenser during wash cycles;

a separate draw valve actuating means for automatically opening and closing each draw valve in the dispenser in response to draw valve open and close signals;

control means coupled to said water and chemical supply means, said draw valve actuating means, and the dispenser'"'"'s product pump, for controlling the automatic cleaning of the dispenser coupled to said cleaning system, including means for generating a product pump ON to cause the product pump in the dispenser to pump water and cleansing solution through the dispenser, means for automatically initiating rinse and wash cycles in a predefined sequence including means for causing said water and chemical supply means to supply plain water to the dispenser'"'"'s product pump during rinse cycles and to supply a cleansing solution to the dispenser during wash cycles, and means for generating draw valve open and close signals to open and close each of the dispenser'"'"'s draw valves a multiplicity of times in accordance with a predefined sequence so as to intermittently release water and cleansing solution from the dispenser and to create agitation in each draw valve in the dispenser for facilitating cleaning of the draw valve;

whereby said cleaning system automatically performs a specified sequence of tasks to clean a cone/shake dispenser.

9. A cleaning system as set forth in claim 8, wherein the cone/shake dispenser includes at least one syrup supply line coupled to a draw valve;

said cleaning system further including;

a separate positive displacement pump for each syrup supply line, for supplying water and cleansing solution from said water and chemical supply means to each syrup supply line, said displacement pump having an outlet and pressure switch means on the outlet of said displacement pump for generating a PUMP ON signal when the pressure on the outlet of said displacement pump falls below a predefined pressure level and for generating a PUMP OFF signal otherwise, said positive displacement pump further having on/off control means for turning on said pump only when said pressure switch means generates a PUMP ON signal;

and pump checking means coupled to each said pressure switch means for receiving the PUMP ON and PUMP OFF signals generated by said pressure switch means, including means for generating a SYRUP LINE CLOGGED signal when the draw valve coupled to a syrup line is open and the corresponding pressure switch means generates a PUMP OFF signal for at least a predefined period of time;

whereby said cleaning system automatically checks the integrity of each syrup line in the dispenser while cleaning the dispenser.

10. A cleaning system as set forth in claim 8, wherein said system includes:

model identifying means for identifying the configuration of a cone/shake dispenser, including the number of freezers and the number of shake dispensing draw valves coupled to the shake freezer, if any, in the cone/shake dispenser;

wherein each shake dispensing draw valve is coupled to a separate syrup supply line and a common shake freezer;

the number of said draw valve actuating means exceeds the number of draw valves on at least one cone/shake dispenser configuration that can be cleaned by said system; and

a plurality of pumps for pumping fluid from said mixing tank into syrup supply lines;

at least one of said pumps including means for preventing fluids from being pumped therethrough if said pump is not attached to a syrup supply line;

each said pump including a pressure switch for generating a pressure signal indicating whether the pressure on the corresponding syrup line exceeds a predefined pressure limit;

said control means including;

assigning means for separately activating each said draw valve actuating means and then monitoring said pressure signals to determine if said draw valve actuating means is coupled to one of said draw valves, and to find the corresponding syrup line pump;

said control program thereby assigning one draw valve actuating means and one pump to each shake dispensing draw valve associated with the configuration of the cone/shake dispenser;

means for generating, during rinse and wash cycles, separate draw valve open and close signals for each assigned draw valve actuating means, for opening and closing each shake dispensing draw valve, in accordance with a specified schedule;

whereby said cleaning system can clean cone/shake dispensers having a plurality of different configurations.

11. A cleaning system as set forth in claim 10, further including status means for communicating status information to the user of said cleaning system;

said control means including means for generating an error message on said status means if (a) any of said pressure signals indicate that the corresponding line pressure is below said limit for at least a threshold period of time while the corresponding draw valve is closed, or (b) any of said pressure signals indicate that the corresponding line pressure is above said limit for at least a threshold period of time while the corresponding draw valve is open.

12. A cleaning system as set forth in claim 10, wherein the cone/shake dispenser may including a cone freezer in fluid connection with a cone dispensing draw valve and a cone pressure line;

said system including a pump for pumping fluid from said mixing tank into said cone pressure line;

said pump for said cone pressure line including a pressure switch for generating a pressure signal indicating whether the pressure on the cone pressure line exceeds a predefined pressure limit;

said assigning means including means for monitoring said pressure signal for said cone pressure line to determine which draw valve actuating means is coupled to the dispenser'"'"'s cone dispensing draw valve if said identified cone/shake dispenser configuration includes a cone freezer;

said control means including means for generating a separate draw valve open/close signal for opening and closing said cone dispensing draw valve, in accordance with a specified schedule.

13. A cleaning system as set forth in claim 8, wherein the cone/shake dispenser includes at least one syrup supply line coupled to a draw valve having a spinner for mixing shakes dispensed using the draw valve;

each spinner including means for turning the spinner on and off in response to spinner on and off signals;

said control means in said cleaning system further including means for generating spinner on and off signals for turning on the dispenser'"'"'s spinners while opening the corresponding draw valve to facilitate the cleaning of the draw valve; and

said cleaning system including a separate pump for each syrup supply line, for supplying water and cleansing solution from said water and chemical supply means to each syrup supply line, said pump having an outlet and pressure switch means on the outlet of said pump for generating a PUMP ON signal when the pressure on the outlet of said pump falls below a predefined pressure level and for generating a PUMP OFF signal otherwise, said pump further having on/off control means for turning on said pump only when said pressure switch means generates a PUMP ON signal.

14. A cleaning sytsem as set forth in claim 8, wherein

said water and chemical supply means includes flow meter means for generating a water flow signal corresponding to amount of water flowing through said cleaning system;

and product pump check means, coupled to said flow meter means, for monitoring the pumping ability of each of the product pumps in the dispenser by monitoring said water flow signal generated by said flow meter means, including means for calculating a flow rate value from said water flow signal during a predefined time period and for generating a PRODUCT PUMP PROBLEM signal if said calculated flow rate is less than a predefined threshold value;

whereby said cleaning system automatically checks the operability of each product pump in the dispenser while cleaning the dispenser.

15. A cleaning system as set forth in claim 8, wherein said water and chemical supply means includes:

a mixing tank having a usable mixing capacity of no more than two gallons,

means for routing water and cleansing solution from said mixing tank to the dispenser,

water inlet means for routing water from a water supply into said mixing tank as water and cleansing solution are removed from said mixing means by said routing means, including overflow means for limiting the flow of water into said mixing tank so that the level of fluid in said mixing tank does not exceed a predefined level,

an overflow valve for routing water from a water supply into said mixing tank and for limiting the flow of water into said mixing tank so that the level of fluid in said mixing tank does not exceed a predefined level,

flow meter means for generating a water flow signal corresponding to amount of water flowing into said mixing tank,

chemical feeding means coupled to said flow meter means for supplying cleansing chemical to aid mixing tank substantially contemporaneously with the flow of water into said mixing tank, including means for receiving said water flow signal, and means for adding cleansing chemical to said mixing tank at a rate corresponding to the rate at which water flows into said mixing tank;

whereby a relatively small mixing tank can be used to mix cleansing solution as it is being used to clean the dispenser, avoiding the need to mix large batches of cleansing solution before cleaning the dispenser.

16. A cleaning system as set forth in claim 15, further including a movable housing mounted on wheels for housing said water and chemical supply means and said control means;

whereby said cleaning system can be moved or stored away from a dispenser when said cleaning system is not being used to clean the dispenser, and can be moved into close proximity with a dispenser when said cleaning system is being used to clean the dispenser.

17. A cleaning system as set forth in claim 8, wherein the cone/shake dispenser includes at least one syrup supply line coupled to a draw valve;

said cleaning system further including status means for communicating status information to the user of said cleaning system, and a separate pump for pumping fluid from said water and chemical supply means into each of the dispenser'"'"'s syrup supply lines, each said pump including a pressure switch for generating a pressure signal indicating whether the pressure on the corresponding syrup line exceeds a predefined pressure limit;

said control means includes means for generating an error message on said status means if (a) any of said pressure signals indicate that the corresponding line pressure is below said limit for at least a threshold period of time while the corresponding draw valve is closed, or (b) any of said pressure signals indicate that the corresponding line pressure is above said limit for at least a threshold period of time while the corresponding draw valve is open;

whereby said cleaning system can warn the user of said cleaning system that a syrup line requires repair.

18. A cleaning system as set forth in claim 8, wherein said water and chemical supply means includes:

a mixing tank having a capacity of less than one tenth the volume of the water and cleansing solution used while cleaning the dispenser,

means for delivering water and cleansing solution from said mixing tank to the dispenser,

water inlet means for routing water from a water supply into said mixing tank as water and cleansing solution are removed from said mixing means by said delivering means, including overflow means for limiting the flow of water into said mixing tank so that the level of fluid in said mixing tank does not exceed a predefined level,

flow meter means for generating a water flow signal corresponding to amount of water flowing into said mixing tank,

chemical feeding means coupled to said flow meter means for supplying cleansing chemical to said mixing tank substantially contemporaneously with the flow of water into said mixing tank, including means for receiving said water flow signal, and means for adding cleansing chemical to said mixing tank at a rate corresponding to the rate at which water flows into said mixing tank;

the quantity of said cleansing chemical added to said mixing tank being proportional to the amount of water which flows into said mixing tank so as to maintain a predefined concentration level of treatment chemicals in said mixing tank;

whereby a relatively small mixing tank can be used to mix cleansing solution as it is being used to clean the dispenser, avoiding the need to mix large batches of cleansing solution before cleaning the dispenser.

19. A cleaning system as set forth in claim 18, further including:

a conductivity probe inside said mixing tank for generating a conductivity signal corresponding to the conductivity of the fluid in said mixing tank;

and cleansing concentration checking means coupled to said conductivity probe for comparing said conductivity signal with a predefined allowed conductivity range during predefined portion of time during which said cleaning system is cleaning the dispenser, and generating an error signal if said conductivity signal is outside said allowed range for at least a threshold period of time.

20. A cleaning system for a frozen confection dispenser having at least one freezer, each freezer having a product inlet and a product pump for pumping product from the inlet into the freezer, and at least one draw valve for dispensing the product in the freezer, the product pump including means for turning the product pump on and off in accordance with a product on/off signal;

the dispenser including at least one flavor supply line coupled to a draw valve for supplying a flavored liquid to the frozen confection dispensed by the draw valve;

said cleaning system comprising;

startup means for generating a startup signal;

water and chemical supply means for routing water from a water supply to a frozen confection dispenser'"'"'s product pump, including means for routing plain water to the dispenser'"'"'s product pump during rinse cycles, and for adding cleansing chemicals to water drawn from a water supply and then routing the resulting cleansing solution to the dispenser during wash cycles;

separate draw valve actuating means for opening and closing each of the dispenser'"'"'s draw valves in response to distinct valve open/close signals;

a separate pump for each flavor supply line, for supplying water and cleansing solution from said water and chemical supply means to each flavor supply line, said pump having an outlet and pressure switch means on the outlet of said pump for generating a pressure signal indicating whether the pressure in the flavor supply line exceeds a predefined pressure limit;

said pump further having on/off control means for turning on said pump only when said pressure signal indicates that the pressure in the flavor supply line does not exceed said predefined pressure limit; and

control means coupled to said startup means, said water and chemical supply means, and each said draw valve actuating means;

said control means including preprogrammed computer means for;

responding to said startup signal by performing a specified sequence of rinsing and cleansing tasks, including generating a product pump on/off signal to turn on each said product pump, and generating valve open/close signals for opening and closing each of the dispenser'"'"'s draw valves a multiplicity of times in accordance with a specified schedule so as to create agitation in each draw valve in the dispenser, thereby facilitating cleaning of the draw valves;

whereby said cleaning system can automatically perform a specified sequence of tasks to clean a frozen confection dispenser.

21. A cleaning system as set forth in claim 20, further including status means for communicating status information to the user of said cleaning system;

flavor line problem detecting means for generating an error message on said status means if (a) any of said pressure signals indicate that the corresponding line pressure is below said limit for at least a threshold period of time while the corresponding draw valve is closed, or (b) any of said pressure signals indicate that the corresponding line pressure is above said limit for at least a threshold period of time while the corresponding draw valve is open;

whereby said cleaning system can warn the user of said cleaning system that a flavor supply line requires repair.

22. A cleaning system for a cone/shake dispenser having at least one freezer, each freezer having a product inlet, a product pump for pumping product from the product inlet into the freezer, and at least one draw valve coupled to the freezer for dispensing the product in the freezer, the product pump including means for turning the product pump on and off in response to product pump ON and OFF signals;

the dispenser further including a plurality of syrup lines coupled to a corresponding plurality of draw valves (shake dispensing draw valves) coupled to a freezer;

said cleaning system comprising;

water and chemical supply means for routing water from a water supply to a cone/shake dispenser'"'"'s product pump, including means for routing plain water to the dispenser'"'"'s product pump during rinse cycles, and for adding cleansing chemicals to water from a water supply and then routing the resulting cleansing solution to the dispenser during wash cycles;

separate draw valve actuating means for automatically opening and closing each draw valve in the dispenser in response to draw valve open and close signals;

a separate positive displacement pump for each syrup supply line, for supplying water and cleansing solution from said water and chemical supply means to each syrup supply line, said displacement pump having an outlet and pressure switch means on the outlet of said displacement pump for generating a pressure signal indicating whether the pressure on the corresponding syrup line exceeds a predefined pressure level, said positive displacement pump further having on/off control means for turning on said pump only when said pressure signal indicates that the corresponding line pressure is below said pressure limit; and

control means coupled to said water and chemical supply means, each said draw valve actuating means, and the dispenser'"'"'s product pump, for controlling the automatic cleaning of the dispenser coupled to said cleaning system, including means for generating a product pump ON to cause the product pump in the dispenser to pump water and cleansing solution through the dispenser, means for automatically initiating rinse and wash cycles in a predefined sequence by causing said water and chemical supply means to supply plain water to the dispenser'"'"'s product pump during rinse cycles and to supply a cleansing solution to the dispenser during wash cycles, and means for generating draw valve open and close signals for each separate draw valve in the dispenser to open and close each of the dispenser'"'"'s draw valves a multiplicity of times in accordance with a predefined sequence so as to create agitation in each draw valve for facilitating the cleaning of the draw valves;

whereby said cleaning system automatically performs a specified sequence of tasks to clean a cone/shake dispenser.

23. A cleaning system as set forth in claim 22, further including status means for communicating status information to the user of said cleaning system;

said control means including means for generating an error message on said status means if (a) any of said pressure signals indicate that the corresponding line pressure is below said limit for at least a threshold period of time while the corresponding draw valve is closed, or (b) any of said pressure signals indicate that the corresponding line pressure is above said limit for at least a threshold period of time while the corresponding draw valve is open;

whereby said cleaning system can warn the user of said cleaning system that a syrup line requires repair.