KR102460202B1 - Water dispenser - Google Patents

Abstract

An object of the present invention is to provide a water server capable of detecting leaks at an early stage.
A cold water tank 2 disposed inside the case 1 , a raw water supply path 6 for introducing beverage into the cold water tank 2 , and a cooling device 20 for cooling the beverage stored in the cold water tank 2 . And, the cold water pouring path 22 which pours the low-temperature beverage in the cold water tank 2 to the outside of the case 1, and the air which introduces air into the cold water tank 2 according to the fall of the water level in the cold water tank 2 A water server having an introduction passage 30 and a water leak sensor 33 having an electrode 44 disposed inside the air introduction passage 30 so as to contact the beverage when the beverage enters the air introduction passage 30 . .

Description

WATER SERVER{WATER DISPENSER}

The present invention relates to a water server for supplying beverages.

Conventionally, water servers have been mainly used in offices, hospitals, and the like. However, in recent years, interest in water safety and health has increased, and water servers are also spreading to general households. A water server generally includes a case, a cold water tank disposed inside the case, a raw water supply path for introducing a beverage into the cold water tank, a cooling device for cooling the beverage stored in the cold water tank, and a low temperature temperature in the cold water tank. It has a cold water pouring path which pours a beverage to the outside of a case, and an air introduction path which introduces air into the cold water tank according to the fall of the water level in a cold water tank.

This water server is used by pouring low-temperature drinking water in a cold water tank from a cold water pouring path, a cup, etc. Here, when pouring out the low-temperature beverage in the cold water tank to the outside, air is introduced into the cold water tank from the air introduction path, and the inside of the cold water tank is prevented from becoming a negative pressure. Moreover, when the water level in a cold water tank becomes low, drinking water is introduce|transduced into a cold water tank from a raw water supply path according to the fall of the water level (for example, patent document 1).

Patent Document 1: Japanese Patent Laid-Open No. 2014-58332

By the way, a water server is provided in floor surfaces, such as a flooring, in many cases. And when the water leaks from a water server, if the floor surface gets wet with the water, it becomes a cause that a floor surface is corroded or discolored. In particular, if the detection of the leak is delayed, the amount of outflow water also increases, so there is a risk that the leak may lead to the lower floor.

Therefore, the inventor examines a method for automatically detecting water leakage of a water server, and as such a method, an electrode for detecting water leakage is installed at the bottom of the case of the water server, and water leaking from the inside of the case is removed from the bottom of the case. It was thought that the method of detecting a water leak by detecting the water with an electrode was effective.

However, even if the electrode installed in the bottom of the case can detect water leakage from the water server, it is thought that a considerable amount of water has already leaked from the inside of the case at the stage where the water is stagnant at the bottom of the case, so install the water server. It is difficult to reliably prevent leakage to one floor surface.

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to provide a water server capable of detecting leaks at an early stage.

The inventors have found that when drinking water is excessively introduced into the cold water tank from the raw water supply path due to a certain problem, and the drinking water overflows from the cold water tank, the drinking water is first introduced into the cold water tank with air for introducing air. We paid attention to the point that it penetrated into the furnace and flowed out through this air introduction passage. Then, the idea was obtained that, when an electrode was provided in the air introduction path and water leakage was detected with the electrode, it became possible to detect water leakage very early.

In order to solve the above problems, the present invention provides a water server having the following configuration.

case and

a cold water tank disposed inside the case;

a raw water supply path for introducing beverages into the cold water tank;

a cooling device for cooling the beverage stored in the cold water tank;

a cold water dispensing path for pouring low-temperature beverages in the cold water tank to the outside of the case;

an air introduction path for introducing air into the cold water tank according to a decrease in the water level in the cold water tank;

A water leak sensor having an electrode disposed inside the air introduction passage so as to contact the beverage when the beverage enters the air introduction passage

A water server with

In this way, when drinking water enters the air introduction path from the cold water tank, it is possible to detect the drinking water by the water leak sensor. Therefore, when drinking water is excessively introduced into the cold water tank from the raw water supply path due to some problem, at a very early stage before the drinking water that has entered the air introduction path from the cold water tank flows out through the air introduction path, It becomes possible to detect a leak.

Preferably, the electrode is disposed in a non-condensing region in the air introduction passage where condensation due to low temperature of the cold water tank does not occur.

In this way, even if dew condensation occurs inside the air introduction passage due to the low temperature of the cold water tank, it is possible to prevent malfunction of the water leak sensor due to the dew condensation, and it is possible to ensure the reliability of water leak detection.

An air filter for trapping foreign substances in the air may be installed in the middle of the air introduction path. In this case, as the non-condensing region in which the electrode is disposed, a portion on the side opposite to the side of the cold water tank with respect to the air filter among the entire paths of the air introduction path may be adopted.

That is, since the part on the side opposite to the cold water tank side with respect to the air filter in the whole path|route of the air introduction path is partitioned from the cold water tank side through an air filter, it is difficult for the cold air of a cold water tank to flow in. Therefore, in the portion of the entire path of the air introduction path on the side opposite to the cold water tank side with respect to the air filter, the inner surface of the air introduction path does not become low temperature, and dew condensation does not occur. By disposing the electrode in such a non-condensing region, it is possible to effectively prevent a malfunction of the water leak sensor due to dew condensation, and it is possible to secure the reliability of water leakage detection.

As the air introduction path, an inner surface in contact with the air introduced into the cold water tank may be formed of resin or rubber. In this case, as the non-condensing region for arranging the electrode, a portion spaced apart from the cold water tank by 3 cm or more among the entire path of the air introduction path may be employed.

That is, in the portion of the entire path of the air introduction path made of resin or rubber that is at a distance of 3 cm or more from the cold water tank, since the low temperature of the cold water tank is difficult to be transmitted, dew condensation does not form on the inner surface. By disposing the electrode in such a non-condensing region, it is possible to effectively prevent a malfunction of the water leak sensor due to dew condensation, and it is possible to secure the reliability of water leakage detection.

When further comprising: a water pump installed in the middle of the raw water supply path; and a control unit for controlling the driving of the water pump, the control unit is configured to: When the water leak sensor detects that drinking water has entered the air introduction path, the water supply pump It is preferable to configure to stop the operation of the.

In this way, it becomes possible to prevent the water leak of a water server very effectively.

In the water server of the present invention, when a beverage enters an air introduction passage from a cold water tank, the beverage can be detected by a water leak sensor. Therefore, when drinking water is excessively introduced into the cold water tank from the raw water supply path due to some problem, water leaks at a very early stage before the drinking water that has entered the air introduction path from the cold water tank flows out through the air introduction path. It becomes possible to detect

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the normal operation state of the water server of embodiment of this invention.
Fig. 2 is a cross-sectional view taken along line II-II of Fig. 1;
Fig. 3 is an enlarged cross-sectional view in the vicinity of the water leak sensor of Fig. 2;
Fig. 4 is a cross-sectional view taken along line IV-IV of Fig. 3;
Fig. 5 is an exploded perspective view of the water leak sensor shown in Fig. 2;
Fig. 6 is a cross-sectional view showing a sterilization operation state of the water server of Fig. 1;

In Fig. 1, a water server according to an embodiment of the present invention is shown. This water server includes a case (1), a cold water tank (2) and a hot water tank (3) disposed inside the case (1), and a container holder (5) on which an exchangeable raw water container (4) is placed; It has a raw water supply path 6 for introducing the drinking water from the raw water container 4 into the cold water tank 2 , and a tank connection path 7 for connecting the cold water tank 2 and the hot water tank 3 . The cold water tank 2 and the hot water tank 3 are arranged vertically side by side so that the hot water tank 3 is located below the cold water tank 2 . Moreover, the raw water container 4 and the container holder 5 are arrange|positioned below the cold water tank 2 and the hot water tank 3 .

The case 1 has a bottom plate 8 , a peripheral wall 9 erected from the periphery of the bottom plate 8 , and a top plate 10 provided on the upper end of the peripheral wall 9 . An opening 11 for putting in and taking out the raw water container 4 and a front door 12 for opening and closing the opening 11 are provided in the lower front surface of the peripheral wall 9 .

One end of the raw water supply path 6 is connected to the joint part 13 detachable from the export port of the raw water container 4 , and the other end of the raw water supply path 6 is connected to the cold water tank 2 . A water supply pump 14 is provided in the middle of the raw water supply path 6 . The driving of the feed water pump 14 is controlled by the control unit 15 .

A first selector valve 16 is provided in a portion between the joint portion 13 of the raw water supply path 6 and the water supply pump 14 . The downstream end of the path|route 17 for hot water circulation is connected to the 1st switching valve 16. The hot water circulation path 17 is a path used to circulate the hot beverage of the hot water tank 3 into the inside of the water server during a sterilization operation to be described later.

The first switching valve 16 is a raw water supply position that communicates between the feed water pump 14 and the raw water container 4 and blocks between the feed water pump 14 and the hot water circulation path 17 (refer to FIG. 1 ). and a hot water circulation position (see FIG. 6 ) that cuts off between the feed water pump 14 and the raw water container 4 and communicates between the feed water pump 14 and the hot water circulation path 17 (see FIG. 6 ). is configured to

A second selector valve 18 is provided in the portion between the water supply pump 14 and the cold water tank 2 of the raw water supply path 6 . The upstream end of the path|route 17 for hot water circulation is connected to the 2nd switching valve 18. As shown in FIG. The second selector valve 18 is a raw water supply position that communicates between the feed water pump 14 and the cold water tank 2 and cuts off between the feed water pump 14 and the hot water circulation path 17 (refer to FIG. 1 ). and the hot water circulation position (see FIG. 6 ) that cuts off between the feed water pump 14 and the cold water tank 2 and also communicates between the feed water pump 14 and the hot water circulation path 17 (see FIG. 6 ). is configured to

The cold water tank 2 accommodates air and drinking water in two upper and lower layers. A cooling device 20 for cooling the beverage stored in the cold water tank 2 is attached to the cold water tank 2 . The cooling apparatus 20 is arrange|positioned on the outer periphery of the cold water tank 2, and it maintains the drinking water in the cold water tank 2 at low temperature (about 5 degreeC).

The cold water tank 2 is equipped with a water level sensor 21 that detects the water level of the beverage stored in the cold water tank 2 . When the water level detected by the water level sensor 21 decreases, the water supply pump 14 operates according to the decrease of the water level, and the raw water container 4 passes through the raw water supply path 6 to the cold water tank 2 . beverages are provided.

A cold water pouring path 22 is connected to the bottom surface of the cold water tank 2 through which the low-temperature beverage stored in the lower portion of the cold water tank 2 is poured out of the case 1 . The cold water pouring path 22 is provided with a cold water cock 23 that can be operated from the outside of the case 1, and by opening the cold water cock 23, cold water can be poured from the cold water tank 2 into a cup or the like. has been

The hot water tank 3 is in a state filled with drinking water. A heating device 24 for heating the beverage in the hot water tank 3 is attached to the hot water tank 3 , and the hot water in the hot water tank 3 is maintained at a high temperature (about 90° C.).

On the upper surface of the hot water tank 3 , a hot water pouring path 25 is connected to the outside of the case 1 for pouring hot beverage stored in the upper part of the hot water tank 3 . The hot water pouring path 25 is provided with a hot water cock 26 that can be operated from the outside of the case 1, and by opening the hot water cock 26, hot water can be poured from the hot water tank 3 into a cup or the like. has been When drinking water is poured from the hot water tank 3, the same amount of drink as the drink flows through the tank connection path 7 and flows from the cold water tank 2 into the hot water tank 3, so the hot water tank 3 is It is always kept full.

An air introduction path 30 for introducing air into the cold water tank 2 in accordance with a decrease in the water level in the cold water tank 2 is connected to the upper surface of the cold water tank 2 . The air introduction path 30 includes an air sterilization chamber 31 , a tube 32 communicating between the cold water tank 2 and the air sterilization chamber 31 , and a water leak sensor attached to the air sterilization chamber 31 . 33). The tube 32 is made of resin or rubber.

As shown in Fig. 2, the air sterilization chamber 31 includes a case 36 having an air inlet 34 and an air outlet 35, an ozone generating chamber 37 formed in the case 36, and an air inlet. An air inlet passage 38 communicating between 34 and the ozone generating chamber 37, an air outlet 35 communicating between the air outlet 35 and the ozone generating chamber 37, an air inlet passage ( It has an inlet side air filter 40 provided in the middle of 38), and an outlet air filter 41 provided in the middle of an air outflow path (39). The case 36 is made of resin.

In the ozone generating chamber 37, an ozone generating body 42 for converting oxygen in the ozone generating chamber 37 into ozone is provided. As the ozone generator 42, for example, a low-pressure mercury lamp that converts oxygen into ozone by irradiating ultraviolet rays to oxygen in the air can be used.

The inlet air filter 40 and the outlet air filter 41 are mesh air filters that capture foreign substances in the air when air is introduced from the atmosphere into the air layer in the cold water tank 2 . In addition, in order to prevent ozone in the ozone generating chamber 37 from flowing out from the air inlet 34, the inlet air filter 40 is an activated carbon filter containing activated carbon. Similarly, in order to prevent ozone in the ozone generating chamber 37 from flowing out from the air outlet 35, the outlet air filter 41 is also an activated carbon filter containing activated carbon.

3 and 4 , the water leak sensor 33 is attached to the air inlet 34 portion of the case 36 of the air sterilization chamber 31 . The water leak sensor 33 has a sensor box 43 and two electrodes 44 attached to the sensor box 43 . The water leak sensor 33 is detachable from the case 36 with claw portions 45 at two upper and lower places provided in the case 36, and when the water server is maintained, the water leak sensor 33 Only parts are independently removable. The two electrodes 44 are horizontally spaced apart inside the sensor box 43, and are arrange|positioned (refer FIG. 5). Each electrode 44 is fixed to the sensor box 43 by engaging a cut-up member 46 formed on the electrode 44 into a recess 47 formed on the inner surface of the sensor box 43 .

Here, the two electrodes 44 are connected to the entire path of the air introduction path 30 (here, the tube 32, the air inflow path 38 inside the case 36, the ozone generating chamber 37, and the air outlet path). (39) and the inner space of the sensor box 43], the outlet air filter 41 is disposed on the opposite side to the cold water tank 2 side. Moreover, it is arrange|positioned in the part which has a distance of 3 cm or more (preferably 5 cm or more, More preferably, 10 cm or more) from the cold water tank 2 among the whole path|route of the air introduction path 30.

The raw water container 4 is formed by giving flexibility so that it may contract|contract with the decrease of the amount of residual water. Such raw water container 4 may be formed, for example, by blow molding of polyethylene terephthalate (PET) resin or polyethylene (PE) resin.

A second water leak sensor 48 is provided on the bottom plate 8 of the case 1 . The bottom plate (8) is provided with an inclined surface (49) for guiding the water leaking from the inside of the case (1) to the bottom plate (8) when the water accumulates in the bottom of the case (1). The second water leak sensor 48 is a sensor that detects the presence or absence of water using an electrode, similarly to the water leak sensor 33 .

The control unit 15 is electrically connected to the water leak sensor 33 and the second water leak sensor 48 , and when the drinking water is detected by the water leak sensor 33 or the second water leak sensor 48 , the water supply pump 14 . ) to stop the operation. Further, the control unit 15 is also electrically connected to the cooling device 20 and the heating device 24 , and when the water leak sensor 33 or the second water leak sensor 48 detects a beverage, the cooling device 20 ) and the heating device 24 are stopped. In addition, this water server is provided with a notification device (warning buzzer, warning lamp, etc.) not shown that notifies the user of an abnormality when the water leak sensor 33 or the second water leak sensor 48 detects an abnormality. have.

An example of use of the above-described water server will be described.

In the normal operation state shown in FIG. 1, the water level in the cold water tank 2 becomes low when the user of the water server operates the cold water cock 23 and pours the low-temperature drinking water in the cold water tank 2 into a cup or the like. Further, even when the hot water cock 26 is operated and the hot beverage in the hot water tank 3 is poured into a cup or the like, the same amount of beverage as the beverage passes through the tank connection path 7 and is warmed from the cold water tank 2 . Since it is introduced into the tank 3, the water level in the cold water tank 2 is lowered. Then, when the water level sensor 21 detects that the water level in the cold water tank 2 is lower than the preset lower limit water level, the water supply pump 14 operates, so that drinking water is poured from the raw water container 4 into the cold water tank 2 . is supplied After that, when the water level sensor 21 detects that the water level in the cold water tank 2 has become equal to or higher than the preset upper limit water level, the water supply pump 14 is stopped. Thus, by operating the water supply pump 14 according to the water level detected by the water level sensor 21, the water level in the cold water tank 2 is maintained in a certain range.

Moreover, the said water server sterilizes the inside of the raw water supply path 6 by regularly performing a sterilization operation, and it is possible to ensure hygiene over a long period of time. This sterilization operation is demonstrated.

First, as shown in FIG. 6, the 1st switching valve 16 and the 2nd switching valve 18 are switched from the raw water supply position to the hot water circulation position. Then, the water pump 14 is operated. As a result, the hot beverage in the hot water tank 3 passes through the hot water circulation path 17 , the first selector valve 16 , the raw water supply path 6 , and the second selector valve 18 in order, and circulates. do. At this time, by energizing the heating device 24 of the hot water tank 3, the temperature of the circulating beverage is maintained at a high temperature suitable for sterilization.

After the sterilization operation is completed, the feed water pump 14 is stopped, and, as shown in FIG. 1 , the first selector valve 16 and the second selector valve 18 are switched from the hot water circulation position to the raw water supply position, usually return to the driving state.

However, when using the water server, there is a possibility that, due to some problem, the drinking water is introduced into the cold water tank 2 from the raw water supply path 6 excessively, and the drinking water overflows from the cold water tank 2 . . For example, in the normal operation state, when the water level in the cold water tank 2 falls below the lower limit water level, the operation of the water pump 14 starts, and thereafter, even though the water level in the cold water tank 2 reaches the upper limit water level However, for some reason, the water level sensor 21 cannot detect that the water level in the cold water tank 2 has reached the upper limit water level, and as a result, the water supply pump 14 does not stop and continues to operate, A case in which drinking water is excessively introduced into the cold water tank 2 from the supply path 6 is conceivable. Also, for example, when switching from the normal operation state to the sterilization operation state, for some reason, only the first switching valve 16 does not switch from the raw water supply position to the hot water circulation position, and the water supply pump 14 operates in that state. , a case in which drinking water is excessively introduced into the cold water tank 2 from the raw water supply path 6 is conceivable. In this way, when a certain problem causes and drinking water is introduced into the cold water tank 2 from the raw water supply path 6 excessively, there is a possibility that the drinking water overflows from the cold water tank 2 . At this time, water leakage can be detected by the second water leak sensor 48 installed on the bottom plate 8 of the case 1 , but at the stage where the water is stagnant in the bottom plate 8 , a significant amount of water has already accumulated in the case 1 . Since it is thought that it has leaked inside, it is difficult to prevent reliably the water leak to the floor surface F where the water server was installed.

Here, when the beverage overflows from the cold water tank 2 , the beverage first enters the air introduction passage 30 for introducing air into the cold water tank 2 , and passes through the air introduction passage 30 . is leaked out Paying attention to this point, in the water server of this embodiment, the electrode 44 is provided in the air introduction path 30, and it makes it possible to detect water leakage very early with the electrode 44.

That is, this water server is provided with a water leak sensor 33 having an electrode 44 disposed inside the air introduction passage 30 so as to contact the beverage when the beverage enters the air introduction passage 30 . , when a beverage enters the air introduction path 30 from the cold water tank 2 , it is possible to detect the beverage by the water leak sensor 33 . Therefore, when drinking water is excessively introduced into the cold water tank 2 from the raw water supply path 6 due to some problem, the drinking water entering the air introduction path 30 from the cold water tank 2 enters the air introduction path. It is possible to detect a leak at a very early stage, before it leaks through (30).

In addition, in this water server, at the end of the air introduction passage 30 on the side of the cold water tank 2 , a float valve (for example, The one disclosed in Japanese Patent Application Laid-Open No. 2016-199300) is not installed, and thus, drinking water is allowed to flow into the air introduction passage 30 from the cold water tank 2 . For example, if there is a float valve at the end of the air introduction path 30 on the side of the cold water tank 2 that prevents the drinking water from flowing into the air introduction passage 30 from the cold water tank 2, what kind of problem may be caused. When drinking water is excessively introduced into the cold water tank 2 from the raw water supply path 6, there is no place for the drinking water inside the cold water tank 2 to escape, so the feed pump 14 of the raw water supply path 6 ) and the cold water tank 2, there is a risk of water leakage in the piping portion.

On the other hand, in the above water server, since drinking water is allowed to flow into the air introduction passage 30 from the cold water tank 2, a certain problem is caused, and the cold water tank 2 from the raw water supply passage 6 is When drinking water is introduced excessively into the water supply path 6, a situation in which water leakage occurs in the piping portion between the water supply pump 14 and the cold water tank 2 of the raw water supply path 6 is prevented, and the drinking water overflowing from the cold water tank 2 is prevented. can be detected very early by the water leak sensor 33 of the air introduction passage 30 .

Moreover, in this water server, the electrode 44 of the water leak sensor 33 is arrange|positioned in the inside of the air introduction path 30 in the non-condensing area|region where condensation by the low temperature of the cold water tank 2 does not generate|occur|produce. That is, the portion on the side opposite to the cold water tank 2 side with respect to the outlet air filter 41 in the entire path of the air introduction path 30 is connected to the cold water tank 2 side through the outlet air filter 41 . Since it is partitioned, it is difficult for the cold air of the cold water tank 2 to flow in. Therefore, in the portion of the entire path of the air introduction path 30 on the side opposite to the cold water tank 2 side with respect to the outlet air filter 41, the inner surface of the air introduction path 30 is less likely to be low temperature and condensation is prevented. doesn't happen And, since the electrode 44 of the water leak sensor 33 is disposed in this non-condensing area, even if dew condensation occurs inside the air introduction path 30 due to the low temperature of the cold water tank 2, water leakage due to the dew condensation The malfunction of the sensor 33 is prevented, and it is possible to ensure the reliability of leak detection. In addition, in the part of the entire path of the air introduction path 30 formed of resin or rubber that is at a distance of 3 cm or more from the cold water tank 2, since the low temperature of the cold water tank 2 is difficult to be transmitted, dew condensation is formed on the inner surface. doesn't happen And since the electrode 44 of the water leak sensor 33 is arrange|positioned in this non-condensing area|region, the malfunction of the water leak sensor 33 by condensation is prevented, and it becomes possible to ensure the reliability of water leak detection.

In addition, in this water server, when the water leak sensor 33 detects that drinking water has entered the air introduction passage 30, the control unit 15 is configured to stop the operation of the water supply pump 14, It has become possible to prevent the water leak of a water server very effectively.

In the above embodiment, the electrode 44 of the water leak sensor 33 is attached to the air inlet 34 of the air sterilization chamber 31 , but the electrode 44 of the water leak sensor 33 is the air sterilization chamber 31 . It may be attached to the inside of the tube (for example, the lower part of the ozone generating chamber 37 or the air inflow path 38), or the sensor box 43 is interposed in the middle of the tube 32 to be attached to the sensor box 43. good to do

It is also possible to omit the air sterilization chamber 31 , connect the sensor box 43 to the tube 32 , and attach the electrode 44 of the water leak sensor 33 to the sensor box 43 . In this case, in order to avoid the influence of dew condensation due to the low temperature of the cold water tank 2, a tube 32 formed of resin or rubber is adopted, and the length of the tube 32 is 3 cm or more (preferably 5 cm or more, More preferably, it is preferable to set it as 10 cm or more). In addition, when an air filter that captures foreign substances in the air is attached to the sensor box 43, the electrode 44 of the water leak sensor 33 is located on the side opposite to the cold water tank 2 side with respect to the air filter. It is preferable to attach

In the above embodiment, a water server of the type in which drinking water is introduced into the cold water tank 2 from the exchangeable raw water container 4 was described as an example. It can also be applied to a type of water server that introduces beverages.

1: Case
2: cold water tank
6: Raw water supply path
14: water pump
15: control unit
20: cooling device
22: cold water pouring path
30: air introduction path
33: water leak sensor
41: outlet side air filter
44: electrode

Claims (5)

case (1) and
A cold water tank (2) disposed inside the case (1),
a raw water supply passage (6) for introducing drinking water into the cold water tank (2);
a cooling device 20 for cooling the beverage stored in the cold water tank 2;
a cold water dispensing path 22 for pouring low-temperature beverages in the cold water tank 2 to the outside of the case 1;
an air introduction path (30) for introducing air into the cold water tank (2) according to a decrease in the water level in the cold water tank (2);
A water leak sensor 33 having an electrode 44 disposed inside the air introduction passage 30 so as to contact the beverage when the beverage enters the air introduction passage 30 .
including,
The electrode (44) is disposed in a non-condensing area inside the air introduction passage (30) in which condensation due to the low temperature of the cold water tank (2) does not occur. The method according to claim 1, wherein an air filter (41) for trapping foreign substances in the air is provided in the middle of the air introduction path (30),
The non-condensing area is a portion of the entire path of the air introduction path (30) on the side opposite to the side of the cold water tank (2) with respect to the air filter (41). The method according to claim 1 or 2, wherein the air introduction passage (30) has an inner surface in contact with the air introduced into the cold water tank (2) made of resin or rubber,
The non-condensing area is a portion of the entire path of the air introduction path 30 that is separated from the cold water tank 2 by 3 cm or more. 3. The method of claim 1 or 2,
a water pump 14 installed in the middle of the raw water supply path 6;
A control unit (15) for controlling the driving of the water pump (14)
provide more,
The control unit (15) stops the operation of the water supply pump (14) when the water leak sensor (33) detects that drinking water has entered the air introduction path (30). delete

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