# Patent

## Title
Beverages dispenser and a method for dispensing beverages

## Abstract

A beverages dispenser, particularly for carbonated beverages, comprises a cooled tank where beverage is stored, an inlet pipe to the tank, an inlet valve on the inlet pipe, a pump downstream the inlet valve for feeding a beverage to the tank in order to maintain a predetermined level wherein, an outlet pipe from the tank to a beverage dispensing nozzle, and an outlet valve on the outlet conduit. An auxiliary pipe is disposed between the inlet pipe downstream the inlet valve and the outlet pipe downstream the outlet valve and a control unit is adapted to close the inlet valve and to run the pump in order to empty the outlet pipe into the tank after the beverage is dispensed in order to prevent dripping.

## Background
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation of U.S. patent application Ser. No. 14/168,589, filed Jan. 30, 2014, which is a divisional of U.S. patent application Ser. No. 13/523,122, filed Jun. 14, 2012, now U.S. Pat. No. 8,657,161, issued Feb. 25, 2014, all of which are hereby incorporated by reference in their entirety.


BACKGROUND OF THE INVENTION
The present invention relates to a beverage dispenser, particularly for carbonated beverages, comprising at least a cooled tank where a beverage is stored, an inlet conduit to the tank, an inlet valve on the inlet conduit, a pump downstream the inlet valve for feeding beverage to the tank in order to maintain a predetermined level therein, an outlet conduit from the tank to a beverage dispensing nozzle and an outlet valve on the outlet conduit.
SUMMARY OF THE INVENTION
With the term “beverage dispenser” we mean every system for dispensing beverages either included in a refrigerator appliance or installed within a piece of furniture in a kitchen (for instance a sink). Moreover, with the term “beverage” we mean any liquid which can be dispensed by the beverages dispenser, including still or sparkling water, soft drinks carbonated or not carbonated, fruit juices etc.
Today the standalone beverages dispensers as well as beverages dispensers on refrigerators dispense carbonated and not carbonated beverages at the touch of a button. The user, by pressing a dispensing button on a user interface of the dispenser, activates solenoid valve devices which are located inside the unit. These valve devices are usually quite far from the dispenser nozzle, usually under the sink or in the back side of the refrigerator.
With such known solutions a solenoid valve inside the unit closes the outlet line to the dispenser nozzle anytime the dispensing button is released. The drawback is that the system closed the outlet conduit or pipe by means of a valve, but in the pipe itself there's still some beverage or water which can escape to the outlet dispensing nozzle. This drawback is even worse if the dispensed beverage is a carbonated type beverage, for instance carbonated water. In this case the dripping occurs because carbon dioxide dissolved into the beverage tries to escape in the atmosphere, so pushing liquid to the dispenser nozzle. The amount of liquid dripping is a function of the level of carbonation, the higher the carbonation level the longer the dripping.
It is therefore an object of the present invention to provide a beverage dispenser of the type mentioned at the beginning of the description which does not present the drawbacks of the known solutions, and which is simple, reliable and has a low cost.
According to the invention, this object is reached thanks to the features listed in the appended claims. One of the main advantages of the invention is related to the pump, which is already installed into the unit to fill the tank, is also used to avoid the dripping without any major modification to the dispenser outlet which is usually located far from the unit, either on the sink or on the counter in the kitchen or refrigerator door location. By adding an auxiliary conduit placed between the inlet conduit downstream the inlet valve and the outlet conduit downstream the outlet valve, by closing the inlet valve, is the pump may be switched on and used to empty the outlet conduit by delivering the beverage still contained in such conduit (after beverage dispensing) into the cooled tank.



BRIEF DESCRIPTION OF THE DRAWINGS
Further advantages and features of a beverage dispenser according to the present invention will be clear from the following detailed description, provided as non limiting example, with reference to the attached drawings in which:
FIG. 1 is a schematic view of a carbonated water dispenser according to a first embodiment of the invention;
FIG. 2 is a diagram showing the behavior of the solenoid valves and pump of the beverage dispenser shown in FIG. 1; and
FIG. 3 is a schematic view of a beverage dispenser according to a second embodiment of the invention.



DETAILED DESCRIPTION
With reference to FIG. 1, a beverage dispenser 10 comprises a cooled tank 12, an inlet conduit 14 connected through a solenoid inlet valve 15 to an hydraulic circuit (water) or to an external storage tank (beverages) and a pump 16 on the inlet conduit 14. On the beverage dispensing side the dispenser 10 comprises an outlet conduit 18 on which a solenoid valve 20 is placed. The pump 16, the inlet valve 15 and the outlet valve, together with a level sensor L inside the tank 12 are connected to a control unit 22 of the dispenser to which an user interface (not shown) is also connected.
According to the invention, between the inlet conduit 14, downstream the inlet valve 15, and the outlet conduit 18, downstream the outlet valve 20, an auxiliary conduit 24 is placed, on which a check valve 26 is installed in order to prevent liquid flow from the inlet conduit 14 to the outlet conduit 18.
In FIG. 2 it is shown the behavior vs. time of the two solenoid valves 15 and 20 and of the pump 16. In the bottom part of FIG. 2, at time t1, when the user demands the delivery of cooled water from the tank 12, the outlet valve 20 opens. At time t2, when the level sensor sends a low level signal to the control unit 22, the pump 16 is switched on together with the inlet valve 15 from the hydraulic system or from a beverage external reservoir. At time t3 the user, through the user interface, closes the outlet valve 20. After time t3, the pump 16 may continue running (as shown in FIG. 2) in order to fill the tank 12 at the set value, while the inlet valve 15 is maintained in an open configuration. At time t4 the level in the tank 12 has reached the set value and therefore the inlet valve 15 is closed. At time t4 the pump 16 is not switched off and is kept running for few seconds (up to time t5) in order to completely empty the outlet conduit 18 by sucking the liquid through the auxiliary conduit 24 to the tank 12. The effect is that with a empty outlet conduit 18, there is no risk of dripping from the nozzle of the dispensing system.
With reference to FIG. 3 (in which the same reference numerals of FIG. 1 have been used for indicating identical or similar elements), it is shown a dispensing system 10 which provides different type of beverages to a dispensing point DP by means of two pipes, one for cold and one for hot beverages.
When carbonated beverage dispensing is requested by the user, the outlet valve 20 opens and the liquid flows to the dispensing point or nozzle DP. When the valve 20, which is activated by the user through a button on the user interface, closes, some amount of liquid remains into the outlet conduit 18 from the outlet valve 20 to the dispensing point DP, so the inlet valve closes and the pump 16 starts sucking the liquid contained in the outlet conduit 18 dispenser pipe and injecting it into the tank 12 to prepare the carbonated beverage. Due to the small amount of liquid inside the outlet conduit 18 this operation lasts only few seconds; after the outlet conduit 18 has been emptied, the inlet valve 15 opens to allow the refill of the tank trough the main filtered water line from the tap.
The refill is based on the water level sensor L of the standard unit. Check valve 26 avoids water flow from the main water line to the dispenser while the tank 12 is refilling.
In the embodiment of FIG. 3 the refrigerated tank 12 contains a serpentine pipe 28 which is used for delivery still cooled water through a first auxiliary solenoid outlet valve 30. In a similar way, the dispensing system according to FIG. 3 shows also a tap water conduit 32 which delivers tap water trough a second auxiliary solenoid outlet valve 34. The methodology for emptying the outlet conduit 18 is used for still cold water and for tap water as well, even if the problem of dripping is mainly for carbonated beverages.

## Claims

1. A refrigerator appliance comprising a refrigeration compartment, a freezer compartment and a beverage dispenser comprising:
at least a cooled tank where a beverage is stored,
an inlet conduit to the tank,
an inlet valve on the inlet conduit,
a pump downstream the inlet valve for feeding the beverage to the tank,
an outlet conduit from the tank to a beverage dispensing nozzle,
an outlet valve on the outlet conduit,
an auxiliary conduit disposed between the inlet conduit downstream the inlet valve and the outlet conduit downstream the outlet valve; and
a control unit adapted to close the inlet valve and to run the pump in order to empty the outlet conduit into the tank after the beverage is dispensed.

2. The refrigerator appliance according to claim 1, wherein the auxiliary conduit comprises a check valve preventing the flow of beverage from the inlet conduit to the outlet conduit.

3. The refrigerator appliance according to claim 1, wherein the tank is adapted to contain carbonated water and is provided with a conduit contained therein for feeding cooled water to the dispensing nozzle by means of a second outlet valve on an auxiliary outlet conduit connected to said outlet conduit.

4. The refrigerator appliance according to claim 3, wherein between the inlet conduit and the outlet conduit a by-pass conduit is installed for delivering still water from the tap to the dispensing nozzle.

5. The refrigerator appliance according to claim 1, wherein the beverage dispenser comprises a second outlet conduit connected to an auxiliary tank for hot water.

6. A method for dispensing beverages from a refrigerator beverage dispenser having at least a cooled tank where a beverage is stored, the method comprising:
providing the beverage dispenser of claim 1;
feeding the beverage to the tank through an inlet conduit and controlling such feeding by means of an inlet valve on the inlet conduit and a pump downstream the inlet valve in order to maintain a predetermined level in the tank;
providing carbon dioxide to the tank to carbonate the beverage; and
dispensing the beverage from the tank to a beverage dispensing nozzle through an outlet conduit provided with an outlet valve, wherein the inlet valve is closed and the pump is switched on after the beverage is dispensed and the outlet valve has been closed in order to suck the beverage from the outlet conduit downstream the outlet valve towards an auxiliary conduit disposed between the inlet conduit downstream the inlet valve and the outlet conduit downstream the outlet valve in order to empty the outlet conduit into the tank.

7. The method according to claim 6, wherein the auxiliary conduit comprises a check valve preventing the flow of beverage from the inlet conduit to the outlet conduit.

8. The method according to claim 6 wherein the tank is adapted to contain carbonated water.

9. A refrigerator appliance comprising a refrigeration compartment and a beverage dispenser configured to dispense carbonated beverages, comprising:
at least a cooled tank where a beverage is stored,
an inlet conduit to the tank,
an inlet valve on the inlet conduit,
a pump downstream the inlet valve for feeding the beverage to the tank,
a carbon dioxide inlet conduit providing carbon dioxide to the tank to carbonate the beverage,
an outlet conduit from the tank to a beverage dispensing nozzle,
an outlet valve on the outlet conduit,
an auxiliary conduit disposed between the inlet conduit downstream the inlet valve and the outlet conduit downstream the outlet valve; and
a control unit adapted to close the inlet valve and to run the pump in order to empty the outlet conduit into the tank after the beverage is dispensed.

10. The refrigerator appliance of claim 9 wherein a cooling source for the cooled tank is cold air.

11. The refrigerator appliance of claim 9 wherein the control unit includes a button that a user may activate.

12. The refrigerator appliance of claim 9 wherein the control unit is further adapted to detect a low level of beverage in the tank, and in response to a low level detection, the control unit ensures that the pump is operating and opens the inlet valve.

13. The refrigerator appliance of claim 9 wherein the control unit is further adapted to detect a targeted level of beverage in the tank, and in response to the targeted level detection, the control unit closes the inlet valve.

14. The refrigerator appliance of claim 9 wherein the auxiliary conduit comprises a check valve preventing the flow of beverage from the inlet conduit to the outlet conduit.

15. The refrigerator appliance of claim 9 wherein the auxiliary conduit flows fluid into the tank to prevent the flow of beverage from the outlet conduit following dispensing of the beverage.

16. The refrigerator appliance of claim 9 where the beverage is water.

17. The refrigerator appliance of claim 9 further comprising a tap water conduit to deliver tap water to the beverage dispensing nozzle.

18. The refrigerator appliance of claim 9 further comprising a chilled water conduit to deliver chilled water to the beverage dispensing nozzle.

19. The refrigerator appliance of claim 9 further comprising a heated water conduit to deliver heated water to the beverage dispensing nozzle.

20. The refrigerator appliance of claim 9 with at least one additional dispensing nozzle connected to a conduit to deliver at least one of tap water, chilled water, and heated water.