JP3601012B2 - Hot water storage tank water supply device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a water supply device for a hot water storage tank, and more particularly to a water supply device for a hot water storage tank in which the amount of water to be refilled in the tank is controlled by the temperature of the hot water stored in the hot water storage tank. .
[0002]
[Prior art]
In an automatic tea dispenser configured to supply hot water heated to a required temperature to a tea strainer containing tea leaves, for example, to pour tea, a hot water storage tank is provided therein, and the hot water storage tank is provided with an external water supply system. A predetermined amount of water is supplied through a water supply pipe communicating with the water supply pipe. Further, a heater is provided at a required portion inside the hot water storage tank, and the heater is continuously energized to heat water in the tank to a set temperature (for example, 90 ° C.). The temperature is set to be maintained by ON-OFF control.
[0003]
This type of device is installed not only in restaurants and restaurants, for example, but also in service areas on expressways, and can be used by an unspecified number of users as appropriate. For this reason, the hot water storage tank is configured to always store a sufficient amount of hot water.However, for example, during times when the frequency of use is high, such as during lunch, the storage amount in the hot water storage tank is significantly increased. Will decrease. Then, when the storage amount drops to a preset water supply water level, a water level sensor disposed in the hot water storage tank detects this and opens an electromagnetic valve provided in the water supply pipe to supply water from an external water supply system. It has become. When the amount of water stored in the hot water storage tank reaches the reference water level due to the replenishment of water, this is detected and the electromagnetic valve is closed to stop replenishing the water. Since the water temperature (hot water temperature) in the hot water storage tank is reduced by replenishing new water, the heater is continuously energized to reheat the hot water to the set temperature.
[0004]
In the automatic tea dispenser, when the stored amount of hot water in the hot water storage tank decreases to the supply water level, as described above, a large amount of water is supplied at one time until the reference water level is reached. For this reason, the water temperature in the hot water storage tank rapidly decreases, and it takes a long time to raise the temperature to the set temperature by reheating by the heater. Further, if the automatic tea 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.
[0005]
Therefore, in order to solve the above problem, when the stored amount of hot water in the hot water storage tank is reduced to the supply water level, the replenishment of the water and the reheating by the heater are performed a plurality of times up to the reference water level. There is a constant temperature water storage device. As shown in FIGS. 11 and 12, in this constant temperature water storage device, a float 78 for detecting a water level is attached to the lower end of a long 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 accordance with the vertical movement of the float 78 in response to a change in water level. It is configured as follows.
[0006]
A fan-shaped light shielding plate 84 constituting a sensor 75 for detecting a water level is integrally rotated at the other end of the arm 80 which is inserted into the bearing 82 and extends outward of the hot water storage tank 76. Installed. As shown in FIG. 15, a plurality of through holes 84a are formed in the light shielding plate 84 in a predetermined pattern along four rows of arc-shaped regions. A photo interrupter holder 86 is mounted on a side surface of the hot water storage tank 76 corresponding to the position where the light shielding plate 84 is mounted via a support plate 88. In this photo interrupter holder 86, as shown in FIGS. 13 and 14, a slit 86a allowing passage of the light shielding plate 84 is formed with a required width along a rotation locus of the light shielding plate 84. A total of four light-emitting elements 90 and light-receiving elements 92 are arranged in pairs on the opposing surface forming the slit 86a. Accordingly, the light-shielding plate 84 rotates with the vertical movement of the float 78, and when the through-hole 84 a of the light-shielding plate 84 is located between the light-emitting element 90 and the light-receiving element 92 forming a pair, the rotation of the light-shielding plate 84 Light from the light emitting element 90 according to the angle is incident on the light receiving element 92. Thus, it is possible to determine 16 levels of water level depending on which of the four light receiving elements 92 the light is incident on. The water level sensor 75 detects the water level at each level, so that the water supply valve for refilling the hot water storage tank 76 is opened and closed. 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 a heater for heating the hot water is performed by the sensor.
[0007]
That is, in the constant temperature water storage device, when the water level drops to the supply water level due to the use of the hot water stored in the hot water storage tank 76, 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 to the hot water storage tank 76 from the external water supply system. When the water level rises due to the replenishment of the water, and the light-shielding plate 84 rotates with the rise of the float 78, the water level sensor 75 detects the water level one level higher than the water level. Close the valve to interrupt water supply. In addition, since the water temperature decreases due to the replenishment of water, the temperature sensor detects this and reheats by the heater.When the water temperature reaches the set temperature, the reheating by the heater is stopped and the water supply valve is opened. Until the water level rises one step again. By repeating the above steps, when the hot water is stored in the hot water storage tank 76 to the reference water level, the water replenishing operation is stopped.
[0008]
As described above, according to the constant temperature water storage device, when the water level in the hot water storage tank 76 decreases, a large amount of water is not supplied at a time from the supply water level to the reference water level, but the water level is changed from the supply water level to the reference water level. It is divided into a plurality of levels, water is replenished to each level, water supply is temporarily interrupted, and in this state, hot water whose temperature has dropped due to replenishment is heated again to the set temperature, and then replenishment is resumed . This allows the warm water to be raised to the set temperature early after the replenishment is performed, so that the period in which lukewarm water is supplied to the user by refilling the hot water storage tank 76 can be significantly reduced. is there.
[0009]
[Problems to be solved by the invention]
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 light of the light-emitting element 90 installed in the photo-interrupter holder 86 passes through the through-holes 84a corresponding to each water level. Then, when the light enters the light receiving element 92, the water level is determined. Therefore, when installing the large-sized hot water storage tank 76, it is necessary to increase the division level for detecting the water level in the tank 76 by the amount of the hot water storage capacity. In this case, since the formation pattern of the through holes 84a must be complicated, it is difficult to divide the water level in more steps than in a small or medium-sized hot water storage tank. Another drawback is that the configuration becomes complicated and the cost increases.
[0010]
Furthermore, since the amount of water supplied to the hot water storage tank at a time is constant, there has been a problem that a change in the temperature of the replenishing water between summer and winter causes a variation in the water temperature during replenishment. In other words, when the temperature of the makeup water is high as in summer, even if fresh water is added to the hot water in the hot water storage tank maintained at the set temperature, the temperature does not drop sharply. 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 make-up 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 conceivable to adjust the amount of water to be supplied at one time by changing the division level between summer and winter, but it is pointed out that the adjustment becomes complicated.
[0011]
[Object of the invention]
The present invention has been proposed in view of the above-mentioned drawbacks inherent in the prior art, and has been proposed to solve the problem appropriately.The present invention controls water supply by controlling the temperature of hot water stored in a hot water storage tank. It is another object of the present invention to provide a water supply device for a hot water storage tank capable of increasing a storage amount while always keeping hot water in the tank within a set temperature range.
[0012]
[Means for Solving the Problems]
In order to overcome the above-described problems and appropriately achieve the intended purpose, a water supply device for a hot water storage tank according to the present invention is provided with a heater for heating hot water in the hot water storage tank, and is disposed inside the hot water storage tank. A temperature sensor for detecting the temperature of the hot water, provided in the water supply pipe, and opened when the temperature sensor detects a preset upper limit set temperature to supply water from the water supply pipe to the hot water storage tank, A water supply valve that is closed when the temperature of the water in the tank is reduced by the replenishment and the temperature sensor detects a preset lower limit set temperature to interrupt the replenishment of water from the water supply pipe; After closing, 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 to restart the supply of water.
[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 by taking a preferred embodiment. 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 be applied to an apparatus that supplies only a heated beverage such as tea or soup.
[0014]
【Example】
FIG. 1 is a longitudinal sectional front view of a beverage supply device in which a water supply device according to an embodiment is adopted, and FIG. 2 is a longitudinal sectional side view of the beverage supply device. In the beverage supply device 10 shown in the figure, a housing 17 is constituted by an upper main body 14 and a lower main body 16 formed of a plate material such as stainless steel in a box shape, and the upper main body 14 is mounted and fixed to the lower main body 16. Further, a storage 15 having a heat insulating structure is provided in an upper half thereof. A plurality of (three in this embodiment) concentrated raw material containers 38 storing concentrated raw materials are stored in parallel in the width direction of the main body 14 in a storage room 15 a defined inside the storage case 15. (See FIG. 1). The lower part of each concentrated raw material container 38 is connected to a discharging mechanism 32 provided with a discharging pump 40 and a discharging nozzle 42, and a required amount discharged from the concentrated raw material container 38 via the discharging mechanism 32. Is supplied to the discharge nozzle 42. A pump 70 that supplies cold water cooled by an ice bank mechanism 21 described later provided in the lower body 16 or hot water stored in a hot water storage tank 46 to the discharge nozzle 42 is provided below the storage 15. , Are arranged corresponding to the respective pouring mechanisms 32. A number (three in this embodiment) of pouring buttons 43 corresponding to the pouring mechanism 32 are provided on the heat-insulating door 19 that opens and closes the opening 15b formed on the front surface of the storage case 15 so as to be able to open and close. By pressing the button 43, the discharge pump 40 of the corresponding discharge mechanism 32 and the pump 70 for supplying cold or hot water are configured to operate.
[0015]
As shown in FIG. 1, a water storage tank 24 for storing a predetermined amount of cooling water and a part of an evaporating pipe 26 derived from the refrigerating mechanism 22 are provided in the cooling water in the water storage tank 24 on the right side inside the lower body 16. An immersed ice bank mechanism 21 is provided. The water storage tank 24 is a bottomed case body having a required depth that opens upward. The water storage tank 24 is surrounded by a heat insulating material so as to keep the temperature of the cooling water stored therein constant. It can be opened and closed freely. As shown in FIG. 2, a condenser 18 and a compressor 20 which constitute a refrigeration mechanism 22 for cooling the cooling water stored in the water storage tank 24 are disposed below the water storage tank 24. The evaporating tube 26 is spirally wound along the vicinity of the inner wall of the water storage tank 24, and is entirely immersed in cooling water. When the refrigerant circulating in the refrigeration mechanism 22 passes through the evaporating tube 26, heat exchange is performed with the cooling water, the temperature of the cooling water gradually decreases, and an ice layer is formed around the evaporating tube 26. It is configured to be. Further, when a cylindrical ice layer having a required thickness is formed on the outer periphery of the evaporating tube 26, the operation of the refrigeration mechanism 22 is controlled to be stopped. That is, the cooling water in the water storage tank 24 after the refrigerating mechanism 22 stops is cooled to a required temperature via the ice layer formed on the outer periphery of the evaporating tube 26.
[0016]
A cooling part 28a, which is spirally wound in the middle of a first water supply pipe 28 whose one end is connected to an external water source (not shown), faces a substantially central part of the water storage tank 26. The portion 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 tap water source passes through the cooling section 28a of the first water supply pipe 28, the tap water is cooled by the cooling water in the water storage tank 24 cooled by the ice layer. 30. The sub-tank 30 communicates with each of the pumps 70 via a cold water pipe 34 (see FIG. 4), and is configured so that when the pump 70 is driven, cold water is supplied to the discharge nozzle 42. . The sub-tank 30 is configured so that the bottom portion contacts the cooling water stored in the water storage tank 24 and the temperature of the dilution cold water supplied into the sub-tank 30 does not rise.
[0017]
In FIG. 1, a hot water storage tank 46 for storing a required amount of hot water is disposed on the inner left side of the lower body 16. The hot water storage tank 46 communicates with a second water supply pipe 60 connected to an external water source constituting a water supply device, and opens a solenoid-operated water supply valve 62 provided on the water supply pipe 60 to thereby open the inside of the tank 46. Is supplied with the required amount of water. As shown in FIG. 3, inside the hot water storage tank 46, a lower limit water level detection float switch (hereinafter referred to as “lower limit water level switch”) 52 is installed near the tank bottom, and near the upper end of the tank 46. An upper limit water level detection float switch (hereinafter, referred to as an “upper limit water level switch”) 54 is provided, and is configured to maintain the water level (reserved amount) of the hot water in the hot water storage tank between the two switches 52 and 54. Further, a heater 58 is disposed below the lower limit water level switch 52, and the heater 58 heats the hot water stored in the hot water storage tank 46 to a set temperature (upper limit set temperature) and keeps the temperature at the set temperature. (See FIG. 7). In addition, below the mouth of the second water supply pipe 60 inside the hot water storage tank 46, a plate-like member that receives water supplied from the second water supply pipe 60 into the tank and disperses the water over a wide range. Are disposed. Thereby, at the time of water supply, the hot water in the hot water storage tank 46 and the newly supplied water are efficiently mixed.
[0018]
In the hot water storage tank 46, lower ends of hot water pipes 66 connected to the respective pumps 70 are inserted, respectively, and are configured to supply hot water to the discharge nozzle 42 by driving the pumps 70. ing. 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 the cold water or the hot water is supplied to the discharge nozzle 42. Is selected and supplied.
[0019]
A temperature sensor 56 for detecting a preset upper limit temperature and a lower limit set temperature is provided inside the hot water storage tank 46, and the open / close control of the water supply valve 62 and the heater 58 are detected by the detected temperature of the sensor 56. Is set to perform ON-OFF control. In other words, when the upper limit water level switch 54 stores hot water in an amount that detects the upper limit water level in the hot water storage tank 46, the heater 58 is turned off when the temperature sensor 56 detects the upper limit set temperature. When the temperature sensor 56 no longer detects the upper limit set temperature, the heater 58 is turned on to maintain the water temperature at the upper limit set temperature. When the hot water in the hot water storage tank 46 is used and the water level is lower than the water level detected by the upper limit water level switch 54, the water supply valve 62 is opened to supply water. Then, when the temperature of the water drops due to the replenishment of the new water and the temperature sensor 56 detects the lower limit set temperature, the water supply valve 62 is closed to set the water supply to be interrupted. In a state where the upper limit water level switch 54 does not detect the water level, the heater 58 is controlled to be always in an ON state, and the hot water whose temperature is reduced by replenishing the water is reheated by the heater 58. .
[0020]
In this embodiment, the temperature sensor 56 does not detect the lower limit set temperature even if a certain period of time has elapsed since the water supply valve 62 was opened (timed by a timer or the like) in order to cope with a situation such as water cutoff or failure of the temperature sensor 56. In this case, it is set so that the water supply valve 62 is closed and the heater 58 is turned off (see FIG. 7). This can prevent the hot water from being heated more than necessary when an abnormal situation occurs. As the water supply valve 62, as shown in FIG. 6, a valve having a built-in flow control valve capable of always supplying a constant amount of water to the hot water storage tank 46 even when the supply water pressure fluctuates is preferably used. In addition, it is also possible to provide a flow control valve separately in the second water supply pipe 60.
[0021]
The pump 70, to which the cold water pipe 34 and the hot water pipe 66 communicate with each other via the three-way valve 36, is a positive displacement self-priming pump and drives a valve body (not shown) disposed inside. To generate a negative pressure to suck cold water or hot water. As shown in FIG. 4, a supply pipe 68 communicating with the discharge nozzle 42 is connected to the discharge side of the pump 70, and a flow control valve 72 and a check valve 74 are interposed in the supply pipe 68. . As shown in the figure, the motors 70 are provided in correspondence with the respective pouring mechanisms 32, so that a low-cost motor having a small pouring capability can be used, and one system has a failure. In such a case, it is possible to cope with the remaining systems. In addition, since the pump 70 is of a self-priming type, the dispensing amount is stable, and even if there is a leak or the like in the hot water supply system, there is almost no splash of hot water. Can be done. In addition, since the amount of cold water or hot water that is self-primed by the pump 70 is stable, large adjustment by the flow control valve 72 is not required, and the check valve 74 prevents backflow.
[0022]
Operation of the embodiment
Next, the operation of the hot water storage 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 a main switch (not shown) of the beverage supply device 10 is turned on, as shown in the flowchart of FIG. 7, the process starts at step 100 (hereinafter, “step” is referred to as “S”), 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 has detected (ON) the lower limit water level. If the determination is affirmative (YES), the process proceeds to S103, and a predetermined time has elapsed since the water supply valve 62 was opened. Check whether or not. Then, if S103 is affirmative (YES), the process proceeds to step 104, where the water supply valve 62 is closed to stop supplying water to the hot water storage tank 46. If the determination is negative (NO) in S102, the sequence returning to S101 is repeated, and if the determination is negative (NO) in S103, the confirmation in S103 is repeated again.
[0023]
Next, in S105, it is checked 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 has not detected the upper limit set temperature, the process proceeds to S105. Is negative (NO), and the heater 58 is turned ON in S106. When the water temperature in the hot water storage tank 46 rises due to the ON operation of the heater 58, and the temperature sensor 56 detects the upper limit set temperature, S105 is affirmed (YES) and the process proceeds to S107. In S107, it is checked whether or not the upper limit water level switch 54 has detected (ON) the upper limit water level. If the answer is negative (NO), the flow proceeds to S108 to check whether or not the lower water level switch 52 is ON. That is, when the level of the hot water stored in the hot water storage tank 46 is near the lower limit water level, and when hot water is supplied from the tank 46 to the discharge nozzle 42 and the heated beverage is discharged, the inside of the tank is Since the water level may be lower than the lower limit water level, S108 is denied (NO) at this time, and the process returns to S101 after the heater 58 is turned off in S114.
[0024]
If the result in S108 is affirmative (YES), the flow proceeds to S109, where the water supply valve 62 is opened again to supply water to the hot water storage tank 46. Since the water temperature in the hot water storage tank 46 decreases due to this water supply, it is checked whether or not the temperature sensor 56 has detected the lower limit set temperature in S110, and if the answer is NO (NO), the water supply valve 62 is opened in S111. Check if a certain time has passed. If the determination in S111 is negative (NO), the process returns to S110. When the determination in S110 is affirmative (YES), the process proceeds to S112, closes the water supply valve 62, and then returns to S105. If a certain period of time elapses before the temperature sensor 56 detects the lower limit set temperature and S111 is affirmed (YES), it is determined that an abnormality such as a failure of the temperature sensor 56 or a water outage has occurred. At S115, the water supply valve 62 is closed, and at S116, the heater 58 is turned off.
[0025]
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 in S105 is negative (NO), and the heater 58 is turned on in S106 (if it is normal). The heater 58 is in the ON state) and heats the hot water in the hot water storage tank 46. Then, if S105 is affirmed (YES), it is confirmed whether or not the upper limit water level switch 54 is ON in S107, and if not (NO), the process proceeds to S108 and the above-described sequence is repeated. That is, until hot water is stored in the hot water storage tank 46 up to the upper limit water level, as shown in FIG. 5, water is gradually supplied while the water temperature is maintained between the upper limit set temperature and the lower limit set temperature. Done. When the hot water is stored in the hot water storage tank 46 up to the upper limit water level, the result is affirmative (YES) in S107, the process proceeds to S113, the heater 58 is turned off, and then the process returns to S105. That is, when the hot water is at the upper limit water level, ON / OFF control of the heater 58 by the temperature sensor 56 is performed by repeating S105, S106, S107, and S113, whereby the water temperature in the hot water storage tank 46 reaches the upper limit set temperature. The holding operation is performed.
[0026]
Further, when the heated beverage is poured out by the beverage supply device 10, the hot water in the hot water storage tank 46 is used and decreases. When the water level falls below the upper limit water level, the upper limit water switch 52 does not detect the upper limit water level. At this time, the opening and closing control of the water supply valve 62 is performed by the temperature sensor 56 described above. When the water level in the hot water storage tank 46 reaches the upper limit water level again, the heater 58 is ON / OFF controlled by the temperature sensor 56.
[0027]
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, when the hot water of the upper limit set temperature is lowered to the lower limit set temperature by replenishment of new water, the water supply is stopped. Regardless of the temperature of the water, the water temperature in the tank is prevented from remarkably lowering from the lower limit set temperature, and the tank can be reheated to the upper limit set temperature in a short time. 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 falls to the lower limit set temperature due to the replenishment of new water. It can prevent that the water temperature in the inside falls remarkably from the lower limit set temperature. Also, when the temperature of the water supplied from the second water supply pipe 60 is high as in summer, a large amount of water can be supplied to the hot water storage tank 46 at one time, and the time required to store the water to the upper limit water level is reduced. 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 configuration is the same as that of the above-described embodiment, only different portions will be described. That is, in another embodiment, an intermediate water level switch 53 is disposed inside the hot water storage tank 46 at a required position between the lower water level switch 52 and the upper water level switch 54. The intermediate water level switch 53 functions to detect the water level (intermediate water level) when supplying water to the empty hot water storage tank 46, close the water supply valve 62, and temporarily stop the supply of water. This prevents a long time from heating the water to the upper limit set temperature by supplying a large amount of water first.
[0029]
[Operation of another embodiment]
Next, the operation of the hot water storage tank water supply device according to another embodiment will be described with reference to the flowchart of FIG. In the flowchart of FIG. 10, only different steps from those in the flowchart of FIG. 7 are denoted by different reference numerals. That is, the process starts at S100 in FIG. 10, and the water supply valve 62 is opened to supply water to the hot water storage tank 46 at S101. In S102, it is confirmed whether or not the lower limit water level switch 52 detects (ON) the lower limit water level. If the determination is affirmative (YES), the process proceeds to S200, where the intermediate water level switch 53 detects the intermediate water level (ON). Check whether you have done so. When S200 is affirmed (YES), the process proceeds to step 104, in which the water supply valve 62 is closed to stop supplying water to the hot water storage tank 46. When S200 is denied (NO), the confirmation in S200 is repeated again.
[0030]
Next, in S105, it is checked 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 has not detected the upper limit set temperature, the process proceeds to S105. Is negative (NO), and the heater 58 is turned ON in S106. When the water temperature in the hot water storage tank 46 rises due to the ON operation of the heater 58, and the temperature sensor 56 detects the upper limit set temperature, S105 is affirmed (YES) and the process proceeds to S107. At this time, since the water is stored only in the temperature storage tank 46 up to the position where the intermediate water level switch 53 is provided, the heating time by the heater 58 is short. Thereafter, the operation is performed in the same manner as in the above-described embodiment.
[0031]
【The invention's effect】
As described above, according to the hot water storage tank water supply device of the present invention, the water supplied to the hot water storage tank is controlled by the temperature of the hot water stored in the tank. The temperature of the stored hot water can be prevented from changing significantly. That is, even when the temperature of the water to be supplied is low as in winter, the temperature of the hot water in the hot water storage tank does not significantly decrease due to the supply of water, and the reheating to the upper limit set temperature can be performed in a short time. it can. This makes it possible to prevent lukewarm water from being supplied from the hot water storage tank. Further, when the temperature of the supplied water is high as in the summer, the amount of water supplied to the hot water storage tank at a time increases, so that 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. Further, the water supply control can always be performed at a constant level without complicating the structure depending on the size of the hot water storage tank. Furthermore, when the upper limit water level switch provided in the hot water storage tank detects the upper limit water level, the temperature of the hot water in the tank can be constantly maintained by ON / OFF control of the heater by the temperature sensor. Furthermore, if the temperature sensor does not detect the lower limit set temperature after a certain period of time has elapsed since the opening of the water supply valve, the water supply valve is closed and the heater is set to be turned off, so that more than necessary hot water is required. Heating can be prevented.
[Brief description of the drawings]
FIG. 1 is a longitudinal 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 the beverage supply device.
FIG. 3 is a vertical sectional side view showing the beverage supply device.
FIG. 4 is an explanatory diagram schematically showing a piping route of the beverage supply device.
FIG. 5 is a graph showing the relationship between water temperature and time when water is supplied to a hot water storage tank.
FIG. 6 is a graph showing a relationship between a water supply pressure of a water supply valve and a discharge amount in the water supply device.
FIG. 7 is a flowchart 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 flowchart at the time of water supply 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 the related art.
FIG. 12 is a side view showing a hot water storage tank of a constant temperature water storage device according to the related art.
FIG. 13 is a front view of a photo-interrupter holder provided in a constant temperature water storage device according to the related art.
FIG. 14 is a sectional view taken along line AA of FIG.
FIG. 15 is a front view of a light shielding plate provided in a constant temperature water storage device according to the related art.
[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)

A heater (58) for heating hot water in the hot water storage tank (46); a temperature sensor (56) disposed inside the hot water storage tank (46) for detecting the temperature of the hot water in the tank; and a water supply pipe (60) And is opened when the temperature sensor (56) detects a preset upper limit temperature to supply water from the water supply pipe (60) to the hot water storage tank (46), and to replenish the tank with the water. A water supply valve (62) that closes when the temperature of the water in the water falls and the temperature sensor (56) detects a preset lower limit temperature to interrupt the supply of water from the water supply pipe (60); After the water supply valve (62) is closed, the water temperature rises due to the heating of the heater (58) and the temperature sensor (56) detects the upper limit set temperature to open the water supply valve (62). To restart water supply Water supply apparatus of the hot water storage tank, characterized in that the. An upper limit water level switch (54) for detecting that the level of the hot water stored in the tank has reached the upper limit water level is provided inside the hot water storage tank (46). Is detected, the heater (58) is turned off when the sensor (56) detects the upper limit set temperature in a state where the opening and 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. If the temperature sensor (56) does not detect the lower limit 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 (58) is turned off. The water supply device for a hot water storage tank according to claim 1, wherein the water supply device is turned off.

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