POST-MIX BEVERAGE DISPENSER

Abstract: A manually-refillable water reservoir assembly (14) which may be retrofit to a post-mix beverage dispenser (10) to supply water from the reservoir instead of from a commercial water supply, includes a manually-refillable water container (16) which plugs into a base assembly (18). The base assembly includes a socket (18A) for receiving the container, a centrifugal pump (P2) and a water filter (F). The beverage dispenser contains a turbine-type pump for supplying water to a carbonator (CT) at a predetermined pressure and flow rate. The inherent slippage in the centrifugal pump permits the flow rate and pressure of water supplied to the dispenser to adjust to that of the turbine-type pump.

Description: The present invention relates to a post-mix beverage dispenser of a kind which is intended to be plumbed to a commercial water supply, and has its object to enable such a dispenser to be retrofitted with a manually-refillable water reservoir assembly. Post-mix beverage dispensers designed for use with commercial water supplies generally have pressure pumps for delivering water to the carbonator thereof from the water supply. These dispensers have predetermined water pressures and flow rates which are desirable for proper operation of the system and the provision of a pressure pump assures the supply of water to the dispenser at these proper flow rates and pressures. An example of such a post-mix beverage dispenser is described in our U.S. Patent 4,496,080 (Farber). In the Farber dispenser, the preferred water pressure flowing to the pump thereof to prevent cavitation is 1 bar gauge, and the preferred water flow rate to the carbonator achieved by the turbine-type pump therein is 1.3 liters per minute. In order to successfully retrofit a manually-refillable water reservoir assembly to the water inlet fitting of the Farber dispenser, or other forms of dispensers generally designed for use with a commercial water supply, it would be desirable to utilize the existing water supply systems and carbonators of those dispensers without any changes thereto. That is, it would be desirable to connect the output of a manually-refillable water reservoir assembly directly to the inlet of the dispenser which would normally be coupled to a commercial water supply. However, in order to do this, the water supply from the manually-refillable water reservoir assembly must be supplied at water pressures and flow rates which are compatible with the water pressures and flow rates required by the pump already provided within the dispenser. To achieve compatible flow rates and pressures, it is necessary to supply water from the manually-refillable water reservoir through an additional pump which is electrically connected in parallel and fluidly in series with the pump provided in the main dispenser housing. However, the connection of plural pumps fluidly in series can pose problems in operation of the respective pumps, unless each pump has compatible flow rates and performance. It would be desirable to achieve compatible operation with respect to flow rates and pressure in the respective pumps without the need for sophisticated control systems associated with the pumps. GB-A-2146620 discloses a post-mix beverage dispenser which operates from the commercial water supply, without its own water reservoir, and mentions that an augmenting pump may be provided if desired, but without specifying the nature of such a pump. According to the present invention there is provided a post-mix beverage dispenser comprising: a) carbonator means for generating a supply of carbonated water; b) first pump means having an inlet and an outlet for supplying water to said carbonator means, said first pump means requiring a predetermined pressure and flow rate at said inlet for normal operation; c) a manually-refillable water reservoir; and d) second pump means having an inlet coupled to said reservoir and an outlet through which water is pumped via conduit means to said first pump means, said second pump means having a sufficient amount of slippage that it will automatically supply water to said first pump means at a pressure and flow rate compatible with said predetermined pressure and flow rate, regardless of the speed at which the second pump means is operated; whereby water from said reservoir is pumped to said carbonator means by said first and second pump means. The respective pumps may be coupled to a safety pressure switch which senses a low level of water in the reservoir. This safety switch will shut off both pumps when a low water level is sensed. In one embodiment, an optional activated charcoal water filter is provided in the conduit means between the first pump and the second pump, to provide filtered water to the dispenser. The pressure drop caused by the pressure of the filter in the conduit is compensated for by the presence of the second pump between the filter and the water reservoir. An embodiment of the invention will now be described by way of example and with reference to the accompanying drawings, in which:- Figure 1 is a perspective view of a post-mix beverage dispenser illustrating a manually-refillable water reservoir assembly attached to the left side of the dispenser cabinet; Figure 2 is a left- and top-side perspective of the manually-refillable water reservoir assembly, exploded to show the respective assembly portions prior to their connection; Figure 3 is a right- and top-side perspective of the water reservoir assembly of Figure 2; and Figure 4 is a schematic diagram illustrating how the respective water supply systems of the water reservoir assembly of the present embodiment, and the post-mix beverage dispenser of a conventional plumbed type, are interconnected in accordance with the teachings of the present invention. Referring to Figure 1, there is generally indicated a post-mix beverage dispenser 10 of a conventional type which is normally supplied with water from a commercial water supply. The beverage dispenser 10 may be of the type disclosed in our said U.S. Patent 4,496,080. The disclosure of that U.S. Patent is incorporated herein by reference. Adjacent the left side of the beverage dispenser 10, there is provided a manually-refillable water reservoir assembly 14 including a top water container portion 16 and a base assembly 18, the details of which will be described hereinafter with respect to Figures 2 and 3. However, assembly 14 may be disposed remotely from the cabinet if desired. Attached to the right side of the dispenser 10 is an optional coin validator mechanism 12. The validator mechanism 12 may be used if the dispenser is located in a commercial establishment unattended by operators. The dispenser 10 is normally provided with a water inlet fitting on the back side of the cabinet behind a selection panel SP, and a water handling and carbonator system (not shown). Referring to Figures 2 and 3, the water reservoir assembly 14 includes the top container 16 having a base wall including a discharge spout 16A. Disposed within discharge spout 16A is a ball check valve 16B which is normally closed when container 16 is filled with water and positioned in the orientation illustrated. Container 16 is preferably transparent, so that one may visually observe the quantity of water in the container at any given time. It is also clear from reference to Figure 2 that the bottom wall in the interior of container 16 slopes slightly toward the discharge spout 16A to facilitate the gravity flow dispensing of water through the spout once the check valve 16B becomes open. The water reservoir assembly also includes the base section or assembly 18, including a centrifugal pump P2, a sockets 18A, and an activated carbon filter F. The pump p2 has an inlet 24 in fluid communication with the socket 18A, and an outlet 26 connected via a conduit C to the optional filter F. Within the socket 18A, there is provided an O-ring seal and an actuating stem 20 supported on a spider 22 for operative interaction with the ball check valve 16B in spout 16A. That is, when container 16 is plugged into socket 18A with spout 16A, the actuating stem 20 displaces ball check valve 16B upwardly, permitting water to flow by gravity from container 16 into socket 18A and the inlet 24 of pump P2. Pump P2 will then pump this water through filter F and conduit C, to the water fitting at the rear of the dispenser 10 and into the water system of the dispenser 10, in a manner to be described hereinafter with respect to Figure 4. Also illustrated in Figure 3 is an access opening 28 through one sidewall of the water container 16, a threaded rim 30 surrounding access opening 28, and a recessed annulus 32. Access opening 28 is preferably large enough to permit an operator's hand to reach into the interior of the container 16 for cleaning and sanitizing the same. A threaded cap 34 screws onto rim 30 to close the access opening. Opening 28 may be disposed even lower on the sidewall than illustrated to preclude refilling in place. A vent 16C is provided in the sidewall of container 16 above the access opening 28. This location of vent 16C is very significant in that the vent 16C will be located above the water line within container 16 in all operative positions of the container 16. For example, when the container 16 is plugged into the base assembly 18, the vent 16C is clearly above the water line within the container, and therefore functions properly to allow water to flow from the container. However, even in a position in which the container is being refilled wherein the container will be placed on its sidewall opposite to the opening 28, the vent 16C is still disposed above the water line. Therefore, the vent 16C is still in an advantageous position with respect to refilling of the container. That is, water will not run out of vent 16C. Figure 4 illustrates the manner in which the respective water systems of the water reservoir assembly 14 and the post-mix beverage dispenser 10 are connected together in order to achieve compatible flow rates and water pressures in the two respective systems. The post-mix beverage dispenser 10 includes a carbonator CT to which water is supplied from a pump P1. The carbonator CT is also supplied with CO² gas from conduit CG, as indicated, in a conventional manner, and carbonated water is output through a conduit CW. Pump P1 in the system illustrated is a turbine-type pump which is operated in order to achieve a flow rate of 1.3 liters per minute, and develop a water pressure sufficient to overcome the CO² pressure within carbonator CT. Both pumps may be coupled to a 3-port pressure sensor PS which monitors pressure in inlet 24. A low-pressure in inlet 24 indicates a low water level. When such a low-level signal is sensed, switch PS will shut down both pumps. An alternate construction would be to place the pressure sensor in conduit C. In order to accurately match the flow rates and pressures of the turbine-type pump P1, it would normally be necessary to provide sophisticated flow rate and pressure control systems for the pump P2 of the water reservoir assembly 14. However, in accordance with the present embodiment, the pump P2 is a centrifugal pump which has a sufficient amount of slippage so that it will adjust to the flow rate of the pump P1 regardless of the speed at which pump P2 is operated. Accordingly, when pump P2 is operated in unison with pump P1, the flow rates controlled by pump P1 and the water pressure become compatible throughout the system in spite of the presence of the filter F, and in spite of the speed at which pump P2 is operated. Therefore, a totally compatible water system is provided between the water reservoir assembly 14 and post-mix dispenser 10, making it easy to retrofit the water reservoir assembly to a conventional type of post-mix beverage dispenser, as illustrated. The centrifugal pump P2, for use in an assembly of the present invention, may be a Gorman-Rupp Industries, High-Speed Centrifugal Pump that produces .5 gpm at 15 psi with maximum flow of 1 gpm and maximum head of 17 psi. The activated charcoal filter F, utilized in the assembly of the present embodiment, may be a commercially-available type manufactured by Omnipure Filter Company. It will thus be seen that, at least in its preferred forms, the present invention provides a manually-refillable water reservoir assembly which may be retrofit to a post-mix beverage dispenser which is normally supplied with water from a commercial supply; and furthermore provides a manually-refillable water reservoir assembly including a pumping system which is compatible in operation with the pumping system contained in the conventional post-mix beverage dispenser; and furthermore provides means for optionally supplying filtered tap water to a post-mix beverage dispenser from a refillable reservoir; and furthermore provides a removable and refillable water container for the reservoir assembly sized to promote frequent filling, to thereby promote sanitation and eliminate the potential of repetitive refill in-place of the container; and furthermore provides a container for a water reservoir assembly which must be removed from a base assembly to refill with water, and may then be plugged into a socket in the base assembly in a rapid and efficient manner; and furthermore provides a refillable container for a water reservoir assembly which may be removed essentially horizontally from the front of a beverage dispenser, with the exception of a limited vertical movement to unplug the same from a base assembly, so that all ingredients for making a post-mix beverage, including water, syrup and CO₂ may be replenished from the front of the dispenser cabinet; and furthermore provides a water reservoir assembly fabricated from materials which are non-reactive with water and chlorine to prevent the creation of an off-taste in the beverage. Attention is directed to EP-A-0351031 whose subject matter has been divided from the present application.

Claims: A post-mix beverage dispenser comprising: a) carbonator means (CT) for generating a supply of carbonated water; b) first pump means (P1) having an inlet and an outlet for supplying water to said carbonator means, said first pump means requiring a predetermined pressure and flow rate at said inlet for normal operation; c) a manually-refillable water reservoir (16); and d) second pump means (P2) having an inlet (24) coupled to said reservoir and an outlet (26) through which water is pumped via conduit means (C) to said first pump means, said second pump means having a sufficient amount of slippage that it will automatically supply water to said first pump means at a pressure and flow rate compatible with said predetermined pressure and flow rate, regardless of the speed at which the second pump means is operated; whereby water from said reservoir is pumped to said carbonator means by said first and second pump means. A post-mix beverage dispenser according to claim 1, wherein items (a) and (b) are included in a main dispenser cabinet (10) and items (c) and (d) are included in a water reservoir assembly (14) operatively connected to said main dispenser cabinet. A post-mix beverage dispenser according to claim 1 or 2, wherein said second pump (P2) means is a centrifugal pump. A post-mix beverage dispenser according to claim 3, wherein said first pump means (P1) is a turbine type pump. A post-mix beverage dispenser according to any of the preceding claims, further comprising water filter means (F) in said conduit means (C). A post-mix beverage dispenser according to any of the preceding claims, further comprising: means (PS) for detecting the level of water in said reservoir (16); and means for shutting off both said first and second pump means (P1, P2) when the level of water falls below a predetermined level. A post-mix beverage dispenser according to claim 6, wherein said means for detecting is a pressure sensor (PS) in said conduit means (C).

Inventors: SEDAM, JASON K.
Applicants: BOSCH-SIEMENS HAUSGERAETE GMBH, THE COCA-COLA COMPANY
Application year: 1987
Main classification: B67D1
IPC codes: B67D1, G07F13, B01F1