JPH08133395A - Water supply device of hot water storage tank - Google Patents

Abstract

PURPOSE: To increase the stored water volume while always retaining the hot water in a tank within a preset temperature range, by controlling the supplying water in accordance with the temperature of the stored hot water in the tank. CONSTITUTION: A storage tank 46 holding 8 required volume of hot water is arranged at the left side of the inside of a drink water supplyer 10. A lower limit water level switch 52, an upper limit water level switch 54, and a heater 58 are installed respectively in the hot water storage tank 46. And a thermosensor 56 detecting the preset temperature of the upper and lower limits of the water temperature is arranged in the tank 46. When the hot water in the tank 46 is used and the water level gets down lower than the detected level of the upper limit switch 54, water is replenished into the tank. By the replenished water, the water temperature goes don and when the preset lower limit temperature is detected by the thermosensor 56, the replenishing water is stopped and then the water is heated by the heater 58. In this way, the water temperature in the tank is kept within a preset range and the water level is increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply device for a hot water storage tank, and more particularly to a hot water storage tank in which the amount of water supplied to the tank is controlled by the temperature of hot water stored in the hot water storage tank. Related to the water supply device.

[0002]

2. Description of the Related Art An automatic tea dispenser in which hot water heated to a required temperature is supplied to, for example, a tea strainer containing tea leaves to brew tea is provided with a hot water storage tank therein. In addition, a predetermined amount of water is supplied through a water supply pipe communicating with an external water supply system. In addition, a heater is provided at a required position inside the hot water storage tank, and the water in the tank is set to a set temperature (for example, 90 ° C) by continuously energizing the heater.
In addition to heating up to (° C.), after reaching the set temperature, it is set to keep the temperature by ON-OFF control of the heater.

This type of device is installed not only in restaurants and restaurants, but also in service areas of expressways, etc., so that it can be appropriately used by an unspecified number of users. For this reason, the hot water storage tank is configured to always store a sufficient amount of hot water, but the storage amount in the hot water storage tank is significantly increased during times when the usage frequency is high, such as during lunch. Will decrease. Then, when the stored amount drops to a preset water supply level, this is detected by a water level sensor arranged in the hot water storage tank, and the solenoid valve provided in the water supply pipe is opened to replenish the water from the external water supply system. It is like this. When the amount of water stored in the hot water storage tank reaches the reference water level due to water supply, this is detected and the solenoid valve is closed to stop the water supply. The water temperature in the hot water storage tank (hot water temperature)
Therefore, the heater is continuously energized to reheat the hot water to the set temperature.

In the automatic tea dispenser, when the amount of hot water stored in the hot water storage tank drops to the water supply level, as described above, a large amount of water is replenished at one time until the reference water level is reached. For this reason, the water temperature in the hot water storage tank drops rapidly, and it takes a long time to raise the temperature to the set temperature by reheating with the heater. Further, if the automatic tea supply machine is used before the hot water reaches the set temperature, there is a problem that lukewarm water is supplied from the hot water storage tank.

Therefore, as a solution to the above problem,
There is a constant temperature water storage device configured to perform water replenishment and reheating by a heater in a plurality of times up to the reference water level when the amount of hot water stored in the hot water storage tank decreases to the water supply level. As shown in FIGS. 11 and 12, this constant temperature water storage device has a float 78 for detecting the water level attached to the lower end of an elongated arm 80 inside a hot water storage tank 76. The other end of the arm 80 is rotatably supported in the vicinity of the upper portion of the hot water storage tank 76 via a bearing 82, and the arm 80 rotates in response to the vertical movement of the float 78 according to the change in the water level. Is configured.

The hot water storage tank 76 is inserted through the bearing 82.
At the other end of the arm 80 extending outwardly, a fan-shaped light-shielding plate 84 that constitutes a sensor 75 for detecting the water level is attached so as to rotate integrally. This light shielding plate 84
15, a plurality of through holes 84a are formed in a predetermined pattern along the four rows of arc-shaped regions. Further, the hot water storage tank 7 corresponding to the position where the light shielding plate 84 is attached
A photo interrupter holder 86 is attached to the side surface of 6 via a support plate 88. In this photo interrupter holder 86, as shown in FIGS. 13 and 14, a slit 86a that allows passage of the light shielding plate 84 is formed along the rotation trajectory of the light shielding plate 84 with a required width, and A total of four sets of light-emitting element 90 and light-receiving element 92 are arranged in pairs on the facing surface portion forming the slit 86a. Therefore, when the float 78 moves up and down, the light shielding plate 84 rotates, and when the through hole 84a of the light shielding plate 84 is located between the pair of the light emitting element 90 and the light receiving element 92, the light shielding plate 84 rotates. The light from the light emitting element 90 according to the angle enters the light receiving element 92. Accordingly, depending on which of the four light receiving elements 92 the light enters, 16
The water level at the street level can be identified. Then, the water level sensor 75 detects the water level of each level, thereby controlling the opening and closing of the water supply valve for supplying water to the hot water storage tank 76. Further, the hot water storage tank 76 is provided with a temperature sensor for detecting the temperature of the hot water, and the sensor is set so that ON / OFF control of the heater for heating the hot water is performed.

That is, in the constant temperature water storage device,
When the hot water stored in the hot water storage tank 76 is used to lower the water level to the water supply level, the water level sensor 75 detects this. In response to a detection signal from the water level sensor 75, the water supply valve is opened and water is supplied from the external water supply system to the hot water storage tank 76. Then, the water level rises due to the replenishment of water, and the light shielding plate 84 rotates with the rise of the float 78, so that the water level sensor 75 detects the water level one level higher than the water level. Close the valve to interrupt the water supply. Also, since the water temperature drops due to water supply, the temperature sensor detects this and reheats it with the heater, and when the water temperature reaches the set temperature,
While reheating by the heater is stopped, the water supply valve is opened to replenish water until the water level rises by one level.
When the hot water is stored up to the reference water level in the hot water storage tank 76 by repeating the above steps, the water supply operation is stopped.

As described above, according to the constant temperature water storage device,
When the water level in the hot water storage tank 76 drops, instead of supplying a large amount of water from the water supply level to the reference water level at once, the water level from the water supply level to the reference water level is divided into a plurality of levels, and water is supplied to each level. Replenishment is performed and water supply is temporarily interrupted. In this state, hot water whose temperature has dropped due to replenishment is heated again to the set temperature, and then replenishment is resumed. As a result, the hot water can be quickly raised to the set temperature after replenishment.
By replenishing the water, it is possible to greatly reduce the period during which the lukewarm water is supplied to the user.

[0009]

In the constant temperature water storage device, a plurality of through holes 84a are provided in a fan-shaped light shielding plate 84 in a predetermined pattern, and the light emitted from the light emitting element 90 installed in the photo interrupter holder 86 has different water levels. Through hole 84 corresponding to
The water level is determined by passing through a and entering the light receiving element 92. Therefore, the large hot water storage tank 76
When installing, it is necessary to increase the division level for detecting the water level in the tank 76 as much as the hot water storage capacity increases. In this case, since the formation pattern of the through holes 84a must be complicated, it is difficult to divide the water level in multiple stages more than a small-sized or medium-sized hot water storage tank. It is also pointed out that the structure is complicated and the cost is high.

Further, since the amount of water supplied to the hot water storage tank at one time is constant, there is a problem in that the temperature of the supplied water varies depending on the temperature of the supplied water during the summer and winter. That is, when the temperature of the makeup water is high, such as in the summer, the temperature does not suddenly drop even if new water is added to the hot water in the hot water storage tank that is maintained at the set temperature. Can be returned to. However, if the same amount of water as in summer is supplied to the hot water storage tank when the temperature of the makeup water is low as in winter, the temperature of the water in the tank drops significantly and it takes time to return to the set temperature. Therefore, it is possible to adjust the amount of water to be supplied at one time by changing the dividing level in summer and winter, but it is pointed out that the adjustment becomes complicated.

[0011]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned drawbacks inherent in the prior art described above, and has been proposed in order to solve the above-mentioned drawbacks. Water supply is performed by the temperature of hot water stored in a hot water storage tank. It is an object of the present invention to provide a hot water storage tank water supply device capable of increasing the amount of storage while always maintaining the hot water in the tank within the set temperature range by controlling the above.

[0012]

In order to overcome the above-mentioned problems and preferably achieve the intended purpose, a water supply device for a hot water storage tank according to the present invention is arranged inside a hot water storage tank to heat hot water in the tank. And a temperature sensor arranged inside the hot water storage tank for detecting the temperature of hot water in the tank,
Provided in a water supply pipe communicating with an external water supply system, the temperature sensor is opened when the preset upper limit temperature is detected, and water is supplied from the water supply pipe to the hot water storage tank. A water supply valve that is closed when the temperature of the water drops and the temperature sensor detects a preset lower limit temperature, and interrupts the supply of water from the water supply pipe, and the water supply valve is closed. After that, the water temperature rises due to the heating of the heater, and the temperature sensor detects the upper limit set temperature, so that the water supply valve is opened and the water supply is restarted.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a water supply device for a hot water storage tank according to the present invention will be described below with reference to the accompanying drawings with reference to preferred embodiments. INDUSTRIAL APPLICABILITY The water supply device for a hot water storage tank according to the present invention is suitably used for a beverage supply device having a configuration capable of selectively supplying a cooled beverage such as juice and a heated beverage such as tea or soup as shown in the embodiments. The present invention can also be applied to a device that supplies only heated beverages such as tea and soup.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a vertical sectional front view of a beverage supply device adopting a water supply device according to an embodiment, and FIG. 2 is a vertical side view of the beverage supply device. In the beverage supply device 10 shown in the figure, a casing 17 is composed of an upper main body 14 and a lower main body 16 formed of a plate material such as stainless steel in a box shape.
Is mounted and fixed on the lower main body 16, and a storage 15 having a heat insulating structure is disposed on the upper half thereof. A plurality of (three in the embodiment) concentrated raw material containers 3 storing concentrated raw materials are provided in a storage chamber 15a defined inside the storage 15.
8 are stored in parallel along the width direction of the main body 14.
(See Figure 1). A pouring mechanism 32 having a pouring pump 40 and a pouring nozzle 42 are connected to the lower portion of each concentrated raw material container 38, and the required amount of pouring from the concentrated raw material container 38 via the pouring mechanism 32 is performed. The concentrated raw material is supplied to the pouring nozzle 42. A pump 7 that supplies cold water cooled by an ice bank mechanism 21 to be described later arranged in the lower body 16 or hot water stored in a hot water storage tank 46 to the pouring nozzle 42 at the lower part of the storage case 15.
0 is arranged corresponding to each pouring mechanism 32. The heat insulating door 19 that opens and closes the opening 15b formed in the front surface of the storage case 15 is provided with a number (three in the embodiment) of spout buttons 43 corresponding to the spout mechanism 32. ,
By pressing the button 43, the corresponding pouring mechanism 3
The second pouring pump 40 and the cold water or hot water supply pump 70 are configured to operate.

As shown in FIG. 1, on the right side inside the lower main body 16, a water storage tank 24 for storing a predetermined amount of cooling water and a part of an evaporation pipe 26 led out from the refrigeration mechanism 22 are stored in the water storage tank 24.
An ice bank mechanism 21 immersed in the cooling water therein is provided. The water tank 24 is a bottomed case body having a required depth that opens upward, is surrounded by a heat insulating material so as to keep the temperature of the cooling water stored therein constant, and its opening is covered by the lid 23. It is designed to be opened and closed freely. Below the water storage tank 24, as shown in FIG. 2, a refrigeration mechanism 22 for cooling the cooling water stored in the water storage tank 24.
A condenser 18, a compressor 20, and the like that configure the above are arranged. The evaporation pipe 26 is spirally wound along the vicinity of the inner wall of the water storage tank 24, and the whole is immersed in cooling water. Then, when the refrigerant circulating in the refrigeration mechanism 22 passes through the evaporation pipe 26, heat is exchanged with the cooling water, the temperature of the cooling water gradually decreases, and an ice layer is formed around the evaporation pipe 26. Is configured. Also, the evaporation pipe 26
When a cylindrical ice layer with a required thickness is formed on the outer periphery of,
It is controlled to stop the operation of the refrigeration mechanism 22. That is, the cooling water in the water storage tank 24 after the freezing mechanism 22 is stopped is cooled to the required temperature via the ice layer formed on the outer circumference of the evaporation pipe 26.

A cooling portion 28a, which is spirally wound in the middle of a first water supply pipe 28, one end of which is connected to an external water source (not shown), faces the substantially central portion of the water storage tank 26. The cooling section 28a communicates with a sub tank 30 provided on the lid 23 of the water storage tank 24. That is, when the tap water supplied from the external water source passes through the cooling part 28a of the first water supply pipe 28, it is cooled by the cooling water in the water tank 24 cooled by the ice layer, and this cold water is sub-tank. It is designed to flow into 30. In addition, the sub tank 30
The pumps 70 are connected to each other via a cold water pipe 34 (see FIG. 4), and the cold water is supplied to the pouring nozzle 42 by driving the pumps 70. The bottom of the sub-tank 30 is in contact with the cooling water stored in the water storage tank 24, and the temperature of the diluting cold water supplied into the sub-tank 30 does not rise.

In FIG. 1, a hot water storage tank 46 for storing a required amount of hot water is arranged on the left side inside the lower body 16. The hot water storage tank 46 is communicated with a second water supply pipe 60 connected to an external water source that constitutes a water supply device, and an electromagnetic opening-and-closing water supply valve 62 provided in the water supply pipe 60 is opened. The required amount of water is supplied to. As shown in FIG. 3, inside the hot water storage tank 46, a float switch for detecting a lower limit water level (hereinafter referred to as “lower limit water level switch”) 52 is installed near the bottom of the tank, and is provided near the upper end of the tank 46. Float switch for detecting upper water level (hereinafter referred to as "upper water level switch")
54 is installed and configured to maintain the water level (reserved amount) of the hot water in the hot water storage tank between the switches 52 and 54. Further, a heater 58 is disposed below the lower limit water level switch 52, and the heater 58 heats the warm water stored in the hot water storage tank 46 to a set temperature (upper set temperature) and keeps the temperature at that temperature. (See Figure 7). In addition, below the mouth of the second water supply pipe 60 inside the hot water storage tank 46, a plate shape that receives water supplied into the tank from the second water supply pipe 60 and disperses the water over a wide range. Dispersion plate 64 is provided. As a result, at the time of water supply, the hot water in the hot water storage tank 46 and the newly supplied water are efficiently mixed.

The lower end portions of hot water pipes 66 connected to the respective pumps 70 are inserted into the hot water storage tank 46, and the hot water is supplied to the pouring nozzle 42 by driving the pumps 70. Is configured. In addition,
The cold water pipe 34 and the hot water pipe 66 are connected to each pump 70 via a three-way valve 36. By switching the three-way valve 36, either cold water or hot water can be selected for the pouring nozzle 42. And then supply it.

A temperature sensor 56 for detecting a preset upper limit temperature and a lower limit preset temperature is arranged inside the hot water storage tank 46, and the opening / closing control of the water supply valve 62 is controlled by the temperature detected by the sensor 56. And turn on the heater 58
-Set to perform OFF control. That is,
When the amount of hot water for which the upper limit water level switch 54 detects the upper limit water level is stored in the hot water storage tank 46, the heater 58 is turned off when the temperature sensor 56 detects the upper limit set temperature, and the temperature sensor When 56 does not detect the upper limit set temperature, the heater 58 is turned on to keep the water temperature at the upper limit set temperature. Hot water storage tank 4
When the hot water in 6 is used and the water level becomes lower than the water level detected by the upper water level switch 54, the water supply valve 62 is opened to replenish the water. Then, when the temperature of the water decreases due to new supply of water and the temperature sensor 56 detects the lower limit set temperature, the water supply valve 62 is closed and the supply of water is set to be interrupted. When the upper limit water level switch 54 does not detect the water level, the heater 58 is controlled so as to always be in an ON state, and hot water whose temperature has dropped due to water supply is reheated by the heater 58. .

In the embodiment, in order to cope with a situation such as water cutoff or failure of the temperature sensor 56, the temperature sensor 56 sets the lower limit set temperature even if a certain time has elapsed (timed by a timer or the like) since the water supply valve 62 was opened. If no is detected, the water supply valve 62 is closed and the heater 58 is set to OFF (see FIG. 7). This can prevent the hot water from being heated more than necessary when an abnormal situation occurs. Further, as shown in FIG. 6, the water supply valve 62 preferably has a built-in flow rate adjusting valve capable of constantly supplying a fixed amount of water to the hot water storage tank 46 even if the water supply water pressure fluctuates. It is also possible to separately provide a flow rate adjusting valve in the second water supply pipe 60.

The pump 70, in which the cold water pipe 34 and the hot water pipe 66 communicate with each other through the three-way valve 36,
It is a positive displacement self-priming pump, and is configured to form a negative pressure by driving a valve body (not shown) arranged inside to suck cold water or hot water. As shown in FIG. 4, a supply pipe 68 communicating with the pouring nozzle 42 is connected to the discharge side of the pump 70, and the flow control valve 72 is connected to the supply pipe 68.
And a check valve 74 are inserted. The motor 70
As shown in the figure, since each is provided corresponding to each pouring mechanism 32, it is possible to use a low cost one with a small pouring capacity, and when one system fails, It is possible to deal with the remaining system. Further, since the pump 70 is a self-priming type, the amount of pouring is stable and
In particular, even if there is a leak in the hot water supply system passage, the hot water is scarcely scattered, so that the damage in the machine can be prevented. Further, since the amount of cold water or hot water that is self-sucked by the pump 70 is stable, a large adjustment by the flow rate control valve 72 is not required, and the check valve 74 prevents backflow.

[0022]

Next, the operation of the hot water tank water supply device according to the embodiment will be described with reference to the flowchart of FIG. 7 and the timing chart of FIG. That is, when the main switch (not shown) of the beverage supply device 10 is turned on, as shown in the flowchart of FIG. 7, it starts at step 100 (hereinafter “step” is referred to as “S”), and at S101, Open the water supply valve 62 to open the hot water storage tank 4
Supply water to 6. In S102, it is confirmed whether or not the lower limit water level switch 52 detects the lower limit water level (ON), and if affirmative (YES), the process proceeds to S103 and the water supply valve 6
Check to see if a certain time has passed since 2 was opened.
If S103 is affirmative (YES), step 10
4, the water supply valve 62 is closed to stop the water supply to the hot water storage tank 46. If S102 is negative (NO),
Repeat the sequence of returning to S101 and deny in S103
If (NO), the confirmation in S103 is repeated again.

Next, in S105, it is confirmed whether or not the temperature of the water or hot water stored in the hot water storage tank 46 reaches the upper limit set temperature, and if the temperature sensor 56 does not detect the upper limit set temperature, , S105 is negative (NO), and the heater 58 is turned on in S106. Heater 5
The water temperature in the hot water storage tank 46 rises due to the ON operation of 8,
When the temperature sensor 56 detects the upper limit set temperature, S105
Is affirmative (YES), the process proceeds to S107. S107
Then, the upper limit water level switch 54 detects the upper limit water level (O
N) is confirmed, and if negative (NO), S108
Proceed to and confirm whether the lower limit water level switch 52 is ON. That is, when the water level of the hot water stored in the hot water storage tank 46 is near the lower limit water level and the hot water is supplied from the tank 46 to the pouring nozzle 42 and the heated beverage is poured out, Since the water level may be lower than the lower limit water level, S108 is negative (NO) at this time.
The heater 58 is turned off in S114, and then S1
Return to 01.

If S108 is affirmative (YES), the program proceeds to S109, and the water supply valve 62 is opened again to replenish the hot water storage tank 46 with water. Hot water storage tank 4 by this water supply
Since the water temperature in 6 decreases, the temperature sensor 56
Confirms whether or not the lower limit set temperature has been detected, and the result is negative (NO).
If so, in S111, it is confirmed whether or not a certain time has elapsed since the water supply valve 62 was opened. And negative in S111
If NO, the process returns to S110, and the S110 is affirmative (Y
At the time point of (ES), the process proceeds to S112, closes the water supply valve 62, and then returns to S105. In addition, before the temperature sensor 56 detects the lower limit set temperature, a predetermined time elapses and S1
If 11 is affirmative (YES), it is determined that an abnormality such as a failure of the temperature sensor 56 or water interruption has occurred, the water supply valve 62 is closed in S115, and the heater 58 is turned off in S116.

At the time when the water supply valve 62 is closed in S112, the water temperature has reached the lower limit set temperature due to the replenishment of new water, so the result is negative (NO) in S105, and the heater 58 is turned on (normal) in S106. If so, the heater 58 is turned on) to heat the hot water in the hot water storage tank 46. When S105 is affirmative (YES), S10
In 7 it is confirmed whether or not the upper limit water level switch 54 is ON. If the result is NO (NO), the routine proceeds to S108 and the above-mentioned sequence is repeated. That is, until hot water is stored up to the upper limit water level in the hot water storage tank 46, as shown in FIG.
Water is gradually replenished while the water temperature is maintained between the upper limit setting temperature and the lower limit setting temperature. When hot water is stored up to the upper limit water level in the hot water storage tank 46, S10
If the result is affirmative (YES) in 7, the process proceeds to S113, the heater 58 is turned off, and then the process returns to S105. That is, when the warm water is at the upper limit water level, S105, S106, S107,
By repeating S113, ON-OFF control of the heater 58 is performed by the temperature sensor 56, and thereby operation for maintaining the water temperature in the hot water storage tank 46 at the upper limit set temperature is performed.

Further, when hot beverage is dispensed by the beverage supply device 10, hot water in the hot water storage tank 46 is used and reduced, and when the water level falls below the upper limit water level, the upper limit water switch 52 detects the upper limit water level. At this time, the temperature sensor 56 causes the water supply valve 62 to operate.
Open / close control is performed. When the water level in the hot water storage tank 46 reaches the upper limit water level again, the heater 58 causes the temperature sensor 5 to operate.
ON-OFF control is performed by 6.

As described above, while the hot water in the hot water storage tank 46 is stored from the lower limit water level to the upper limit water level, the water supply is stopped when the hot water of the upper limit set temperature is lowered to the lower limit set temperature by replenishing new water. Therefore, it is possible to prevent the water temperature in the tank from remarkably lowering from the lower limit set temperature and reheat to the upper limit set temperature in a short time regardless of whether the temperature of the makeup water is high or low. That is, even when the temperature of the water supplied from the second water supply pipe 60 is low, for example, in winter, the water supply is stopped when the water temperature is lowered to the lower limit set temperature by the replenishment of new water. It is possible to prevent the internal water temperature from significantly lowering from the lower limit set temperature. Further, when the temperature of the water supplied from the second water supply pipe 60 is high as in the summer, it is possible to replenish the hot water storage tank 46 with a large amount of water at a time, and the time required to store the water up to the upper limit water level is required. It can be shortened.

[0028]

[About another embodiment] FIG. 9 shows a water supply device for a hot water storage tank according to another embodiment of the present invention. Since the basic structure is the same as that of the above-mentioned embodiment, only different parts will be described. To do. That is, in another embodiment, the intermediate water level switch 53 is disposed inside the hot water storage tank 46 at a required position between the lower limit water level switch 52 and the upper limit water level switch 54. The intermediate water level switch 53 detects the water level (intermediate water level) when water is supplied to the empty hot water storage tank 46, and closes the water supply valve 62 to temporarily stop the water supply. As a result, a large amount of water is initially supplied to prevent it from taking time to heat the water to the upper limit set temperature.

[0029]

[Operation of Another Embodiment] Next, the operation of the hot water tank water supply device according to another embodiment will be described with reference to the flowchart of FIG. Note that in the flowchart of FIG. 10, only the steps different from those of the flowchart of FIG. That is, the process starts at S100 of FIG. 10, and at S101, the water supply valve 62 is opened to supply water to the hot water storage tank 46. In S102, it is confirmed whether or not the lower limit water level switch 52 detects the lower limit water level (ON), and if affirmative (YES), the process proceeds to S200, and the intermediate water level switch 53 detects the intermediate water level (ON). Check whether or not. When S200 is affirmative (YES), the routine proceeds to step 104, where the water supply valve 62 is closed and the water supply to the hot water storage tank 46 is stopped. In addition, S200 is negative
If the answer is NO, the confirmation in S200 is repeated.

Next, in S105, it is confirmed whether or not the temperature of the water or hot water stored in the hot water storage tank 46 has reached the upper limit set temperature. If the temperature sensor 56 does not detect the upper limit set temperature, , S105 is negative (NO), and the heater 58 is turned on in S106. Heater 5
The water temperature in the hot water storage tank 46 rises due to the ON operation of 8,
When the temperature sensor 56 detects the upper limit set temperature, S105
Is affirmative (YES), the process proceeds to S107. At this time, since the water is stored only in the storage tank 46 up to the position where the intermediate water level switch 53 is arranged, the heating time by the heater 58 can be short. After that, the same operation as in the above-described embodiment is performed.

[0031]

As described above, according to the hot water tank water supply device of the present invention, the water supplied to the hot water tank is
Since the temperature is controlled by the temperature of the hot water stored in the tank, it is possible to prevent the temperature of the stored hot water from significantly changing depending on the temperature of the supplied water. That is, even when the temperature of the supplied water is low as in the winter, the temperature of the hot water in the hot water storage tank does not significantly decrease due to the supply of water, and it is possible to reheat to the upper limit set temperature in a short time. it can. This makes it possible to prevent the lukewarm water from being supplied from the hot water storage tank. Also,
When the temperature of the water supplied is high, such as during the summer, the amount of water supplied to the hot water storage tank at once increases, so there is an advantage that the water can be stored up to the upper limit water level in a short time. Moreover, since the structure is extremely simple, the cost can be reduced. Also, the structure does not become complicated depending on the size of the hot water storage tank,
Constant water supply control can be performed at all times. Further, when the upper limit water level switch provided in the hot water storage tank detects the upper limit water level, the temperature sensor turns the heater ON-OF.
By performing F control, the temperature of the hot water in the tank can always be kept constant. Furthermore, if the temperature sensor does not detect the lower limit set temperature even after a lapse of a certain time after the water supply valve is opened, the water supply valve is closed and the heater is set to be turned off. It becomes possible to prevent heating.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing a beverage supply device provided with a water supply device according to an embodiment of the present invention.

FIG. 2 is a vertical sectional side view showing a beverage supply device.

FIG. 3 is a vertical sectional side view showing a beverage supply device.

FIG. 4 is an explanatory view schematically showing a piping path of the beverage supply device.

FIG. 5 is a graph showing a relationship between water temperature and time when water is supplied to the hot water storage tank.

FIG. 6 is a graph showing a relationship between a water supply pressure of a water supply valve and a pouring amount in a water supply device.

FIG. 7 is a flow chart when water is supplied by the water supply device.

FIG. 8 is a timing chart when water is supplied by the water supply device.

FIG. 9 is a longitudinal side view showing a beverage supply device provided with a water supply device according to another embodiment.

FIG. 10 is a flow chart diagram when water is supplied by a water supply device according to another embodiment.

FIG. 11 is a partially cutaway front view showing a hot water storage tank of a constant temperature water storage device according to a conventional technique.

FIG. 12 is a side view showing a hot water storage tank of a constant temperature water storage device according to a conventional technique.

FIG. 13 is a front view of a photo interrupter holder arranged in a constant temperature water storage device according to a conventional technique.

14 is a cross-sectional view taken along the line AA of FIG.

FIG. 15 is a front view of a light shielding plate arranged in a constant temperature water storage device according to a conventional technique.

[Explanation of symbols]

46 hot water storage tank, 54 upper limit water level switch, 56 temperature sensor 58 heater, 60 second water supply pipe, 62 water supply valve

Claims (3)

[Claims] 1. A heater (58) disposed inside a hot water storage tank (46) for heating hot water in the tank, and a heater (58) disposed inside the hot water storage tank (46) to detect the temperature of the hot water in the tank. The temperature sensor (56) and the water supply pipe (60) communicating with the external water supply system are provided, and when the temperature sensor (56) detects a preset upper limit set temperature, the water supply pipe (60) opens the Water is supplied to the hot water storage tank (46), and the water supply pipe is closed when the temperature of the water in the tank drops due to the water supply and the temperature sensor (56) detects a preset lower limit temperature. A water supply valve (62) for interrupting the replenishment of water from (60), the water temperature rises by heating the heater (58) after the water supply valve (62) is closed, the temperature sensor ( 56) is configured to open the water supply valve (62) and restart water supply by detecting the upper limit set temperature. Water tank water supply device. 2. An upper limit water level switch (54) for detecting that the water level of hot water stored in the hot water storage tank (46) has reached the upper limit water level, is provided inside the hot water storage tank (46), and the upper limit water level switch (54) When 54) is detecting the upper limit water level, the heater (56) when the sensor (56) detects the upper limit set temperature while the opening / closing control of the water supply valve (62) by the temperature sensor (56) is stopped. The water supply device for a hot water storage tank according to claim 1, wherein the heater (58) is turned on when the upper limit set temperature is no longer detected while the 58) is turned off. 3. If the temperature sensor (56) does not detect the lower limit set temperature even after a certain time has elapsed since the water supply valve (62) was opened, the water supply valve (62) is closed and the heater
The hot water tank water supply device according to claim 1, wherein the (58) is turned off.