KR102290931B1 - Beverage dispenser and method of controlling of beverage dispenser - Google Patents

Abstract

The dispenser 7 includes a cold water tank 11 having a beverage container 2 filled with beverages and a cooling device 13, a casing 10 accommodating the cold water tank, and cold water extending from the cold water tank. A discharging unit 18A and a sterilizing unit for sterilizing by supplying hot water to the cold water tank are provided, and the cold water tank includes a box 12B and a lid 12A for closing the box, and the lid has an opening. is formed, and the cold water tank is provided with a hollow needle 4 that communicates with the opening of the lid and has a tip connected to the beverage container, and at least the hollow needle and the lid are made of metal.

Description

Beverage dispenser and method of controlling beverage dispenser

The present invention relates to a dispenser for supplying beverages and a control method for controlling such dispenser.

Conventionally, a dispenser for cooling the beverage accommodated in the tank in the cold water tank and heating it in the hot water tank and pouring out cold water and/or hot water as needed has been used.

In general, the cold water tank and the hot water tank are sealed, and various germs in the air are prevented from entering the cold water tank and the hot water tank. Japanese Patent Application Laid-Open No. 7-187295 discloses a cold water tank sealed by an airtight lid.

Here, in the dispenser of the prior art, if the dispenser is used for a long period of time, there is a possibility that various germs may be propagated in the cold water tank. For this reason, the dispenser is temporarily stopped periodically, and hot water is supplied to the cold water tank, and the cold water tank is heated to a high temperature for sterilization. However, in order to provide safer and safer drinking water, parts other than the cold water tank, for example, the lid of the cold water tank, and the piping or jig connecting the tank holding the drink and the cold water tank are also required to be sterilized or cleaned. it became sloppy However, the effect of sterilization by hot water is limited to the cold water tank, and in order to sterilize other parts, it is necessary to disassemble the dispenser to sterilize and clean each part.

In addition, in the prior art, there is a possibility that the smell of the surrounding environment of the dispenser penetrates into the cold water tank and the flavor of the beverage is slightly changed.

The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a beverage dispenser capable of suppressing the growth of various bacteria and maintaining the original flavor of the beverage while maintaining cleanliness even when it is operated for a long period of time, and a method for controlling such a dispenser do it with

In order to achieve the above object, according to a first aspect, there is provided a cold water tank having a beverage container filled with beverage and a cooling device, and a hot water tank connected to the cold water tank and provided with a heating device, the cold water tank and the hot water tank. A casing for accommodating the housing, a cold water discharge unit formed in the casing and extending from the cold water tank, a hot water discharge unit formed in the casing and extending from the hot water tank, and a sterilization treatment unit for supplying hot water to the cold water tank to sterilize and the cold water tank includes a box body and a lid for closing the box, and an opening is formed in the lid, and the cold water tank communicates with the opening of the lid, and the tip ends with the beverage. There is provided a beverage dispenser provided with a hollow needle connected to a water spout of a container, wherein at least the hollow needle and the lid are formed of metal.

According to a second aspect, further comprising: a mounting member formed on the lid portion in the first aspect and to which the hollow needle is mounted; and a supply pipe extending from a circumferential surface of the hollow needle to the opening portion of the lid portion, the mounting member and The supply pipe is made of metal.

According to a third aspect, in the first or second aspect, there is further provided an air bleed pipe mounted on the cold water tank and provided with a solenoid valve.

According to a fourth aspect, in any one of the first to third aspects, the cold water tank further includes a level gauge for measuring a predetermined low level of the beverage in the cold water tank.

According to a fifth aspect, in any one of the first to fourth aspects, the box body of the cold water tank is formed of metal.

According to the sixth aspect, a cold water tank having a beverage container in which beverage is sealed and a cooling device, a casing for accommodating the cold water tank, and a cold water discharge unit extending from the cold water tank and extending from the cold water tank are It includes a lid part for closing itself and the box, the lid part has an opening, and the cold water tank is in communication with the opening part of the lid part and a hollow tip connected to the water spout of the beverage container. In the control method of a beverage dispenser provided with a needle and equipped with an air bleed pipe provided with a solenoid valve in the cold water tank, the liquid level of the beverage in the cold water tank is measured to determine the liquid level over a predetermined period of time. is maintained, it is determined that there is no drinking water in the cold water tank, the solenoid valve of the air bleed pipe is opened for a predetermined time, and the solenoid valve of the air bleed pipe is opened for a predetermined time, and then the cold water Provided is a method for controlling a beverage dispenser that measures the liquid level of the beverage in the tank and issues an alarm by judging that there is no beverage in the beverage container when the liquid level is maintained at a predetermined low level over a predetermined time. .

According to a seventh aspect, in the sixth aspect, when the liquid level is maintained at a predetermined low level over a predetermined time, the solenoid valve of the cold water drain unit is closed.

In the first aspect, since an opening is formed in the lid portion and the hollow needle and the lid portion are made of metal, the hollow needle and the lid portion become high temperature in a short time due to the heat of the hot water during sterilization of a cold water tank using hot water. Therefore, these hollow needles and lids are also sterilized, and the cleanliness of the dispenser is maintained for a long period of time without disassembling and cleaning. In addition, since an opening is formed in the lid and a hollow needle is provided in communication with the opening, there is no pressure loss due to the shape of the pipe, and the beverage in the beverage container is easily supplied to the cold water tank. As a result, the water level in the cold water tank can be raised while the sealed structure inside the cold water tank is maintained, so that contact between the drink and the air can be prevented, and bacteria and odors from the atmosphere around the dispenser can be prevented from adhering to the drink in the cold water tank. can be suppressed In addition, since the lid part is formed of metal, thermal deformation due to sterilization of the cold water tank using hot water is suppressed. For this reason, the sealed structure in the cold water tank can be maintained, and it can suppress the penetration|invasion of various microbes from the outside and the odor of the surrounding atmosphere. And since resin-made parts decrease, adhesion of the smell of resin to a drink is suppressed, and the quality of a drink improves. The metal is SUS (stainless steel) or copper or the like.

In the second aspect, since the hollow needle, the lid portion, the mounting member and the supply pipe are made of metal, these parts can be sterilized during sterilization of the cold water tank using hot water. In addition, since the number of resin parts is further reduced, the adhesion of the smell of resin or the odor of the atmosphere around the dispenser to the beverage is further suppressed, and the quality of the beverage is improved.

In the third aspect, since air does not flow in from the outside of the dispenser, mixing of various germs and odors surrounding the dispenser into the dispenser is suppressed. In addition, by evacuating the air in the cold water tank using an air bleed pipe, the beverage in the flexible bag can easily flow into the cold water tank.

In the fourth aspect, when the amount of drinking water in the cold water tank runs out, the state is immediately determined. Therefore, even if the opening of the lid and the hollow needle communicate with each other, the drinking water in the cold water tank is kept almost full. Therefore, it is possible to prevent the beverage from coming into contact with the air, and it is possible to suppress adhesion of various germs and odors around the dispenser to the beverage. As a result, the quality of the beverage is improved.

In the fifth aspect, since the hollow needle, the lid and the box are made of metal, these parts can be sterilized during sterilization of the cold water tank using hot water. In addition, since the number of resin parts is further reduced, adhesion of the resin odor to the beverage is further suppressed, and the quality of the beverage is improved.

In the sixth aspect, when the liquid level of the cold water in the cold water tank maintains a predetermined low level over a predetermined time after the solenoid valve of the air bleed pipe is opened for a predetermined time, the cold water in the cold water tank and the It determines that there is no drink and issues an alarm. Therefore, while maintaining the airtightness in the cold water tank, it is possible to inform the operator that there is no drinking water. This alarm may be an alarm prompting replacement of the flexible bag.

In the seventh aspect, the inflow of various germs and odors of the surrounding environment from the outside into the dispenser through the cold water drain is suppressed.

These and other objects, features and advantages of the present invention will become more apparent from the detailed description of the exemplary embodiments of the present invention shown in the accompanying drawings.

1 is a schematic configuration diagram of a beverage dispenser according to a first embodiment of the present invention.
Fig. 2 is a flowchart for explaining the control method of the beverage dispenser according to the first embodiment.
3 is a schematic configuration diagram of a beverage dispenser according to a second embodiment of the present invention.
4A is a perspective view of the needle cap;
4B is a longitudinal cross-sectional view of the needle cap.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described with reference to an accompanying drawing. In the following drawings, the same reference numerals are assigned to the same members. For ease of understanding, these drawings are appropriately scaled.

1 is a schematic diagram of a beverage dispenser 7 according to a first embodiment of the present invention. The beverage dispenser 7 mainly includes a cold water tank 11 provided with a cooling device 13 and a accommodating portion 1 for accommodating a flexible bag 2 as a beverage container. Here, the flexible bag 2 is formed of a synthetic resin or the like, and seals and accommodates beverages. And the cold water tank 11 is comprised from the box 12B and the lid part 12A which hermetically closes the box 12B. Moreover, the cooling device 13 of the cold water tank 11 plays a role of maintaining the drinking water in the cold water tank 11 at a predetermined low temperature, for example, 10 degrees C or less.

As shown in FIG. 1 , a water spout 3 is formed on the bottom surface of the accommodating part 1 . In addition, a hollow needle 4 communicating with an opening (not shown) of the lid portion 12A is formed in the lid portion 12A of the cold water tank 11 . When the hollow needle 4 punches a hole in the flexible bag 2 through the spout 3, and the hollow needle 4 and the spout 3 are connected, the beverage in the flexible bag 2 is transferred to the hollow needle ( 4) through the cold water tank 11 is supplied. Since the hollow needle 4 communicating with the opening of the lid portion 12A is formed in the lid portion 12A of the cold water tank 11, the beverage in the flexible bag 2 is supplied to the cold water tank 11. It is easy to store the drinking water in the cold water tank 11 in a state of being almost full in a certain amount or more.

Also, as can be seen from FIG. 1 , the cold water tank 11 is included in the casing 10 . And 18A of cold water supply piping provided with the solenoid valve 18B for cold water is extended from the lower surface of the cold water tank 11. As shown in FIG. When the operator operates the solenoid valve 18B for cold water, the cooled beverage in the cold water tank 11 is poured out from the cold water supply port 18C of the cold water supply pipe 18A.

As shown in FIG. 1 , the cold water tank 11 is provided with a level gauge 14 . The level gauge 14 includes a level gauge 141 that can measure a predetermined low level of the beverage in the cold water tank 11 . This level gauge 141 always monitors that beverages above a certain level are stored in the cold water tank, and gives an early warning when the amount of beverages in the cold water tank 11 decreases. Moreover, when the pressure in the cold water tank 11 rises and the supply of the drinking water from the flexible bag 2 becomes slow, the level gauge 141 can take the countermeasure of lowering|hanging internal pressure. As a result, since the beverage is stored in the cold water tank 11 in a state of being substantially full in a certain amount or more, the space in which the air stays in the cold water tank 11 becomes small, and the beverage in the cold water tank 11 does not come into contact with the air. lose Therefore, it is possible to suppress adhesion of various germs and odors to the beverage from the outside of the dispenser. In addition, in the cold water tank 11, another ball-top type level gauge 14h is formed. The level gauge 14h is a so-called ball float type, and when the beverage in the cold water tank 11 reaches a certain full water level, the supply of the beverage from the flexible bag 2 is stopped, and in the sterilization mode to be described later, the cold water tank ( 11) Prevent the beverage inside from flowing back into the flexible bag (2).

And as can be seen from FIG. 1 , an air evacuation pipe 15 provided with a solenoid valve 16 is formed in the lid portion 12A of the cold water tank 11 . When the atmospheric pressure between the lid portion 12A of the cold water tank 11 and the liquid level increases, the solenoid valve 16 is opened according to a command from a control device (not shown). Thereby, when the atmospheric pressure of the cold water tank 11 is high, drinking water is prevented from not being supplied from the flexible bag 2 to the cold water tank 11. As shown in FIG. In addition, a filter 17 capable of preventing backflow of air is formed at the tip of the air bleed pipe 15 to prevent various germs and odors from entering the cold water tank 11 from the outside of the dispenser.

Here, in the present invention, the hollow needle 4, the lid portion 12A, and the level gauge 14h are made of a material having a higher heat transfer property than resin, for example, a metal. Such metals are SUS (stainless steel) or copper or the like. In short, in the present invention, since the number of resin products is reduced as much as possible, adhesion of the resin odor to the beverage in the cold water tank 11 is suppressed, and the odor of the surrounding atmosphere of the beverage dispenser 7 adheres to and adheres to the resin. Adhering to beverages is also suppressed. It will be appreciated that as a result, deterioration of the beverage can be prevented. In particular, when the beverage of the flexible bag 2 is natural water, it is advantageous because the flavor of the natural water can be maintained as it is.

Moreover, as shown in FIG. 1, the hot water tank 30 is connected to the cold water tank 11 via the connection line 20. As shown in FIG. A connection valve 21 is formed in this connection line 20 . The hot water tank 30 is provided with a heating device 31 to maintain the beverage in the hot water tank 30 at a predetermined high temperature, for example, 80°C.

This hot water tank 30 is also included in the casing 10 . And the hot water supply pipe 32A provided with the solenoid valve 32B for hot water is extended from the hot water tank 30. When the operator operates the solenoid valve 32B for hot water, the heated beverage in the hot water tank 30 is poured out from the hot water supply port 32C of the hot water supply pipe 32A.

And as shown in FIG. 1, the hot water circulation line 40 provided with the hot water circulation pump 41 extends from the hot water tank 30 to the opening part (not shown) of the lid part 12A of the cold water tank 11. . These hot water circulation line 40 and hot water circulation pump 41 are not used in normal use of the beverage dispenser 7 .

When the beverage dispenser 7 is operated for a predetermined long period of time, the cooling device 13 of the cold water tank 11 is stopped. And the sterilization mode which sterilizes the cold water tank 11 etc. in the following way is performed.

In the sterilization mode, the connection valve 21 is opened. Then, the hot water circulation pump 41 is driven to pass the hot water in the hot water tank 30 through the hot water circulation line 40 to supply the cold water to the cold water tank 11 . As a result, the beverage in the cold water tank 11 returns to the hot water tank 30 through the connection line 20 .

In this way, the hot water in the hot water tank 30 is circulated through the hot water circulation line 40 , the cold water tank 11 , and the connection line 20 . Therefore, the temperature of the drinking water in the cold water tank 11 becomes 50 degreeC or more.

As described above, in the present invention, the lid portion 12A and the hollow needle 4 are formed of metal. Therefore, when the temperature of the drinking water in the cold water tank 11 is 50° C. or higher, these lid portions 12A and hollow needle 4 also become 50° C. or higher, and various germs adhering to the lid portion 12A and the hollow needle 4 are removed. can be sterilized. In addition, since the beverage in the cold water tank 11 is stored in a state that is more than a certain amount and is approximately full, the heat of the beverage can be transferred to the lid part 12A and the hollow needle 4 more quickly, so that efficient sterilization is possible. . Thereby, the cleanliness of the lid part 12A and the hollow needle 4 is maintained over a long period of time. As a result, there is no need to disassemble the cold water tank 11 to clean and sterilize it. In addition, since the lid portion 12A and the hollow needle 4 are made of a metal resistant to thermal deformation, the lid portion 12A is not deformed even when sterilization is performed with warm water. Therefore, since the sealed structure of the cold water tank 11 can be maintained, it is possible to prevent various germs and odors from entering the beverage from the outside of the dispenser.

However, if the hollow needle 4 and the water spout 3 remain connected in the sterilization mode, there is a case where the temperature of the hollow needle 4 does not exceed 50 ° C due to the drinking water in the flexible bag 2 have. In this case, when replacing the accommodating part 1 which accommodates the flexible bag 2 which is a beverage container, for example, when the accommodating part 1 is removed, a sterilization mode is performed suitably. In this case, in order to prevent heat dissipation from the hollow needle 4, a cylindrical needle cap 50 as shown in FIG. 4A is covered on the hollow needle 4 . The needle cap 50 is composed of a top surface 51 and a circumferential side wall 52, and the top surface 51 and the circumferential side wall 52 have an inner surface 53 and an inner surface 53 made of metal, respectively. It consists of the heat insulating part 54 which prevents heat dissipation in the outer side, and the outer surface part 55 which covers the heat insulating part 54 in the outer side of the heat insulating part 54. As shown in FIG. The heat insulating part 54 is made of a material and structure to insulate, such as a commercially available heat insulator.

That is, the hot water tank 30 , the hot water circulation line 40 , and the hot water circulation pump 41 serve as a sterilizing unit for sterilizing the cold water tank 11 and its related members. Alternatively, a small heating device (not shown) that is connected to the cold water tank 11 and heats only the drinking water in the cold water tank 11 may be provided as a sterilizing unit.

Moreover, in this invention, the box body 12B of the cold water tank 11 may be formed with the same metal as 12A of lid parts. In this case, it will be understood that when the cold water tank 11 is sterilized, the box 12B that is mostly in contact with the beverage can also be sterilized.

And as shown in FIG. 1, in the cold water tank 11, the separator 12C is arrange|positioned. This separator 12C is a T-shaped guide member in cross section. The separator 12C partially separates the beverage in the cold water tank 11 into an upper portion and a lower portion, and the beverage in the upper portion communicates with the connection line 20 through the central pipe portion of the separator 12C. . Due to the presence of the separator 12C, the temperature of the beverage in the upper portion tends to be higher than the temperature of the beverage in the lower portion.

And in FIG. 1 , the connection line 20 extends from the lower surface of the cold water tank 11 . Because of this configuration, a portion of the beverage supplied from the flexible bag 2 to the cold water tank 11 can be supplied to the hot water tank 30 through the connection line 20 without being cooled too much. For this reason, it will be understood that even a case where the cooling performance of the cooling device 13 of the cold water tank 11 is relatively low is sufficient.

In the present invention, the separator 12C of the cold water tank 11 is also formed of the same metal as the lid portion 12A or the like. In this case, it will be understood that when the cold water tank 11 is sterilized, the separator 12C in contact with the beverage may also be sterilized.

When the drinking water in the cold water tank 11 is passed over a predetermined time at 50° C. or higher, the sterilization mode is terminated. After that, the hot water circulation pump 41 is stopped and the cooling device 13 is restarted. And when the temperature of the drinking water in the cold water tank 11 falls to 10 degrees C or less, the supply of the cold water from the cold water tank 11 and the hot water from the hot water tank 30 is restarted.

By the way, as shown in FIG. 1, the control part 33 which controls the dispenser 7 is arrange|positioned in the casing 10. As shown in FIG. And this control part 33 is connected to the speaker 34 provided outside the casing 10. Hereinafter, a control method of the beverage dispenser will be described with reference to FIG. 2 which is a flowchart in the first embodiment. In addition, it is assumed that the process shown in FIG. 2 is performed every predetermined control period.

First, in step S10 of FIG. 2 , the level gauge 14 measures the liquid level of the beverage in the cold water tank 11 . Then, in step S11, the control unit 33 determines whether the liquid level of the beverage is equal to or lower than the low level 141, and whether the low level 141 has been maintained over a predetermined period of time.

If it is determined as NO in step S11, the drinking water in the cold water tank 11 is at a level higher than the low level 141. In this case, it is judged that there is enough drinking water in the cold water tank 11, and the process is terminated.

On the other hand, if it is determined in step S11 as YES, the flow proceeds to step S12 and it is determined that there is no beverage in the cold water tank 11 or that the amount of beverage is less than the desired amount. In this case, in step S13, the solenoid valve 16 of the air bleed pipe 15 is opened for a predetermined period of time to discharge the air in the cold water tank 11 to the outside.

Thereby, the atmospheric pressure between the lid part 12A of the cold water tank 11 and the liquid level falls. As a result, the beverage in the flexible bag 2 is easily introduced into the cold water tank 11 through the hollow needle 4 . Thus, the beverage in the cold water tank 11 is returned to the desired liquid level, for example to a high level 14h.

Moreover, when it is determined that the liquid level of drinking water is below the low level 141, you may close the solenoid valve 18B for cold water of 18 A of cold water supply piping. In this way, it is suppressed from the outside from flowing into the dispenser through the cold water supply port 18C and the cold water supply pipe 18A.

Next, in step S14, in order to confirm this, the level gauge 14 measures the liquid level of the drinking water in the cold water tank 11 again. Then, in step S15, the control unit 33 determines whether the liquid level of the beverage is equal to or lower than the low level 141, and whether the low level 141 has been maintained over a predetermined period of time.

If it is determined in step S15 as NO, it can be determined that there is sufficient drinking water in the cold water tank 11 as described above, and the processing is ended. On the other hand, if it is determined as YES in step S15, the process proceeds to step S16.

In step S16, since no beverage is supplied from the flexible bag 2 to the cold water tank 11, it is determined that there is no beverage in the flexible bag 2 in addition to that there is no beverage in the cold water tank 11. In this case, the control unit 33 issues an alarm from the speaker 34 and prompts the operator that the flexible bag 2 needs to be replaced. The alarm issued from the speaker 34 may be a simple warning sound or a voice indicating that the flexible bag 2 needs to be replaced. Alternatively, a visual alarm may be used to alert the operator, for example by flashing a light.

3 is a schematic configuration diagram of a beverage dispenser according to a second embodiment of the present invention. The second embodiment is implemented when the flexible bag 2 and the cold water tank 11 are separated from each other, and the plate-shaped mounting member 6 is disposed on the lid portion 12A of the cold water tank 11 and the hollow needle 4 is installed on the mounting member 6 . Further, the bellows 5 extends from the peripheral surface of the hollow needle 4, and the tip thereof is inserted into an opening (not shown) of the lid portion 12A.

In the second embodiment, these bellows 5 and the mounting member 6 are also formed of the same metal as the lid portion 12A or the like. It will be understood that in this case, since the temperature of the bellows 5 and the mounting member 6 increases during sterilization of the cold water tank 11, they can be sterilized together. In addition, since there are fewer resin parts, it is further suppressed that the odor of resin adheres to the beverage or the odor of the surrounding atmosphere of the dispenser 7 is further suppressed from adhering to the resin, thereby improving the quality of the beverage.

Further, in the second embodiment, a ball-top type level gauge 24 is provided instead of the level gauge 14 . The level gauge 24 is a so-called ball float type, and when the beverage in the cold water tank 11 reaches a certain full water level, the supply of the beverage from the flexible bag 2 is stopped. This level gauge 24 is also made of the same metal as the lid portion 12A. Therefore, it will be understood that the same effect as described above is obtained.

Although the present invention has been described using typical embodiments, it will be understood by those skilled in the art that the foregoing and various other changes, omissions, and additions may be made without departing from the scope of the invention.

Claims (7)

A beverage container filled with beverage;
a cold water tank having a cooling device;
a hot water tank connected to the cold water tank and provided with a heating device;
a casing accommodating the cold water tank and the hot water tank;
a cold water outlet formed in the casing and extending from the cold water tank;
a hot water discharge part formed in the casing and extending from the hot water tank;
A beverage dispenser having a sterilization unit for sterilizing by supplying hot water to the cold water tank,
The cold water tank includes a box body and a lid for closing the box, and an opening is formed in the lid portion,
The cold water tank is provided with a hollow needle that communicates with the opening of the lid part and the tip thereof is connected to the water spout of the beverage container,
At least the hollow needle and the lid part are formed of metal,
The beverage dispenser,
a mounting member formed on the lid and to which the hollow needle is mounted;
Further comprising a supply pipe extending from the peripheral surface of the hollow needle to the opening of the lid portion,
Beverage dispenser, characterized in that the mounting member and the supply pipe are formed of metal. The method according to claim 1,
A beverage dispenser mounted on the cold water tank and further comprising an air bleed pipe having an electromagnetic valve. The method according to claim 1,
The beverage dispenser further comprising a level gauge for measuring a predetermined low level of the beverage in the cold water tank. The method according to claim 1,
A beverage dispenser in which the box body of the cold water tank is formed of metal. A beverage container filled with beverage;
a cold water tank having a cooling device;
a casing accommodating the cold water tank;
a cold water outlet formed in the casing and extending from the cold water tank;
The cold water tank includes a box body and a lid for closing the box, and an opening is formed in the lid portion,
The cold water tank is provided with a hollow needle that communicates with the opening of the lid part and the tip thereof is connected to the water spout of the beverage container,
In the control method of the beverage dispenser, the cold water tank is equipped with an air bleed pipe having an electromagnetic valve,
Measuring the liquid level of the beverage in the cold water tank,
When the liquid level is maintained at a predetermined low level over a predetermined time, it is determined that there is no drinking water in the cold water tank, and the solenoid valve of the air bleed pipe is opened for a predetermined time,
measuring the liquid level of the beverage in the cold water tank after opening the solenoid valve of the air bleed pipe for a certain period of time,
When the liquid level is maintained at a predetermined low level over a predetermined time, it is determined that there is no beverage in the beverage container, and an alarm is issued. 6. The method of claim 5,
A control method of a beverage dispenser in which the solenoid valve of the cold water drain unit is closed when the liquid level is maintained at a predetermined low level over a predetermined time. delete

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