Refrigerated vending machine exploiting expanded temperature variance during power-conservation mode

• US 6,389,822 B1
• Filed: 05/25/2000
• Issued: 05/21/2002
• Est. Priority Date: 10/28/1998
• Status: Expired due to Term

• Current Assignee: USA Technologies, Inc.
• Original Assignee: Bayview Technology Group Inc. (USA Technologies Incorporated)
• Inventors: Schanin, David J.
• Primary Examiner(s): WAYNER, WILLIAM E
• Application Number:
  US09/579,411
• Time in Patent Office: 726 Days
• Field of Search: 236/47, 700/240, 700/242, 221/150.R, 621/80, 622/50, 623/78, 62/89, 622/31
• US Class Current: 62/89
• CPC Class Codes: F25B 2600/23 Time delays
• CPC Class Codes: F25D 17/062 in household refrigerators
• CPC Class Codes: F25D 2700/02 Sensors detecting door opening
• CPC Class Codes: F25D 2700/04 Sensors detecting the presence of a person
• CPC Class Codes: F25D 2700/123 more than one sensor measuring the inside temperature in a compartment
• CPC Class Codes: F25D 29/00 Arrangement or mounting of control or safety devices
• CPC Class Codes: G05D 23/1902 characterised by the use of a variable reference value
• CPC Class Codes: G07F 9/02 Devices for alarm or indication, e.g. when empty; Advertising arrangements in coin-freed apparatus alarms or warning devices indicating the interruption of flow to be metered G07F15/10
• CPC Class Codes: G07F 9/105 Heating or cooling means, for temperature and humidity control, for the conditioning of articles and their storage dispensers for food articles requiring a processing by temperature treatment or conditioning before they are ready for dispensing G07F17/0064
• CPC Class Codes: H02M 3/156 with automatic control of output voltage or current, e.g. switching regulators

Abstract

A refrigerated soda vending machine includes sensors for monitoring various parameters such as temperature within its refrigerated chamber and for monitoring occupancy in the vicinity of the chamber. The sensor data is used to determine when to switch between a normal mode of operation and a power-conservation mode of operation. In either mode of operation, a cooling system is regulated so that a compressor goes on when an upper internal temperature threshold is reached and off when a lower internal temperature threshold is reached. In the normal mode of operating, fans circulate air within the chamber to maintain a relatively uniform temperature throughout the chamber. During power-conservation mode, the fans are off most of the time the compressor is off. In the absence of circulation, the temperature within the refrigerated chamber stratifies so that a lower cool zone and an upper warm zone can be differentiated. Soda cans are held in vertical stacks so that the lowest cans are located in the cool zone. Cans are dispensed from the bottom of the stacks and thus only from the cool zone. With this arrangement, a patron can obtain an optimally chilled soda even though the average temperature in the chamber is above the optimal temperature range. Thus, energy can be conserved and operating costs reduced while meeting patron'"'"'s expectations for cold sodas at all times.

Claims

1. A refrigerated vending system for vending items, said system comprising:

a chamber for storing said items, said chamber defining a chamber interior and a chamber exterior, said chamber interior including said items and a heat-transfer medium;

dispensing means for dispensing said items from said chamber interior to said chamber exterior;

cooling means for removing heat from said chamber, said cooling means having cooling and non-cooling conditions, said cooling means consuming more power and removing more heat in said cooling condition, said cooling means consuming less power and removing less heat in said non-cooling condition;

circulation means for controlling the temperature variance within said chamber interior by circulating said heat-transfer medium, said forced circulation means having circulating and non-circulating conditions;

thermo-sensor means for providing temperature indications of temperature within said chamber interior; and

controller means for controlling said dispensing means, said cooling means, and said circulation means, said controlling means selecting between a normal mode of operation for said vending system and a power-conservation mode of operation for said vending system, said controller means

during said normal mode, selecting between said cooling and said non-cooling conditions of said cooling means as a function of said temperature indications provided by said thermo-sensor means, and maintaining said circulation means in said circulating condition most of the time when said circulating means is in said non-cooling condition; and

during said power-conservation mode, selecting between said cooling and said non-cooling conditions, and maintaining said circulation means in said non-circulating condition most of the time when said circulating means is in said non-cooling condition.

2. A refrigerated vending system as recited in claim 1 wherein said chamber interior includes a cool zone and a warm zone, said cool zone having a lower space-and-time-averaged temperature than does said warm zone, said dispensing means storing said items in said cool zone and said warm zone, said dispensing means dispensing items only from said cool zone.

3. A refrigerated vending system as recited in claim 2 wherein said cool zone is below said warm zone.

4. A refrigerated vending system as recited in claim 1 wherein said circulation means includes a fan that is on during said circulating condition and off during said non-circulating condition.

5. A refrigerated vending system as recited in claim 1 further comprising activity sensing means to provide activity indications, said controller selecting between said normal mode and said power-conservation mode at least in part as a function of said activity indications.

6. A refrigerated vending system as recited in claim 1 wherein said activity sensing means includes an occupancy sensor.

7. A refrigerated vending system as recited in claim 6 further comprising an absolute-time indicator for providing absolute time indications, said controller selecting between said normal mode and said power-conservation mode in part as a function of said absolute-time indications.

8. A refrigerated vending system as recited in claim 7 further comprising a second thermo-sensor means for providing exterior temperature indications of temperatures exterior to said chamber, said controller selecting between said normal mode and said power-conservation mode in part as a function of said external temperature indications.

9. A method of operating a refrigerated vending system comprising the steps of:

when in a normal mode of operation, monitoring a chamber-interior temperature, controlling a cooling system as a function of said interior chamber temperature, and promoting a relatively small temperature variance with the chamber;

interior by using at least one fan to circulate a gas-phase heat-transfer medium within said chamber interior; and

when in a power-conservation mode of operation, controlling a cooling system and promoting a relatively large temperature variation within said chamber interior by turning said at least one fan off.

10. A method of operating a refrigerated vending system comprising the steps of:

when in a normal mode of operation, monitoring a chamber-interior temperature, controlling a cooling system as a function of said interior chamber temperature, and promoting a relatively small temperature variance with the chamber interior;

when in a power-conservation mode of operation, controlling a cooling system and promoting a relatively large temperature variation within said chamber interior; and

in response to a command to dispense an item, dispensing a first item from a cool zone, said cool zone having a spatially and temporally averaged temperature below the spatially and temporally averaged temperature of said chamber interior during said power-conservation mode.

11. A method as recited in claim 10 wherein said dispensing step further involves moving a second item into said cool zone from a warm zone, said warm zone having a spatially and temporally averaged temperature greater than that of said cool zone during said power-conservation mode.

12. A method as recited in claim 11 wherein said cool zone is below said warm zone.

13. A method of operating a refrigerated vending system comprising the steps of:

monitoring activity;

selecting between said normal mode of operation and said power-conservation mode of operation at least in part as a function of activity indications;

when in said normal mode of operation, monitoring a chamber-interior temperature, controlling a cooling system as a function of said interior chamber temperature, and promoting a relatively small temperature variances with the chamber interior; and

when in said power-conservation mode of operation, controlling a cooling system and promoting a relatively large temperature variation within said chamber interior.

14. A method as recited in claim 13 wherein said monitoring involves monitoring occupancy in the vicinity of said refrigerated vending system.

15. A method as recited in claim 13 wherein said monitoring involves detecting whether or not money is inserted into said vending machine system.

16. A method as recited in claim 13 wherein said selecting step further involves selection in part as a function of absolute time.

17. A method as recited in claim 13 wherein said selecting step further involves selection in part as a function of a temperature exterior of said vending machine.