JP2011242024A - Water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water heater capable of continuously discharging hot water at a high temperature suitable for vending hot drinks and preventing abnormal heating.SOLUTION: The water heater 20 comprises a hot water tank 21 and a control unit 34, and includes: a main heater 27 with large power consumption that rapidly heats supplied drink water having a decreased temperature to obtain hot water at a high temperature, and a sub-heater 28 with smaller power consumption than the main heater 27; and temperature sensors 29, 30 detecting temperatures to be used for controlling currents in the main heater 27 or the sub-heater 28.

Description

  The present invention relates to a hot water supply apparatus provided in a cup-type vending machine or a tea dispenser that stores hot hot water obtained by heating drinking water, cooks a hot beverage with the hot water, and sells it.

  2. Description of the Related Art Conventionally, a hot water supply device provided in a cup-type vending machine or a tea machine is known. For example, in FIG. 2 of Patent Document 1, a coffee bean canister for storing roasted coffee beans, coffee beans supplied from the coffee bean canister are pulverized to a predetermined particle size with a pulverizing blade (powdered coffee beans ( (Hereinafter referred to as “coffee ground beans”), a mixture of ground coffee beans supplied from the mill and hot water supplied through the hot water pipe by opening the hot water tank's hot water valve is filtered through a paper filter. Coffee brewer that extracts coffee liquid containing coffee ingredients, powder raw material canister for storing sugar and cream, etc., coffee liquid extracted from coffee brewer is mixed with sugar and cream supplied from powder raw material canister, coffee drink A schematic configuration of a cup-type vending machine including a mixing bowl and the like is disclosed.

  For example, as shown in FIG. 8, a hot water tank 61 constituting a hot water supply device 60 for supplying hot water to a coffee brewer or a mixing bowl includes a tank body 62, a drinking water supply port 23, a hot water discharge port 24, a hot water valve. 25, a float 31 that moves up and down in conjunction with a change in the amount of hot water, a high water level switch 32, a low water level switch 33 that operate in conjunction with the raising and lowering of the float 31, and a main heater 63 (near the bottom 62a of the tank body 62) For example, two electric heaters having a power consumption of 1000 W) and a sub heater 64 (for example, a power consumption of 500 W), the hot water outlet 24 disposed near the water level, and a hot water temperature display portion provided on the front door of the cup-type vending machine A temperature sensor 65 for detecting the temperature of hot water to be displayed (not shown) and the temperature of hot water for beverage sold-out display control, and a main heater 63 disposed above the water supply port 23 It is composed of two temperature sensors and a temperature sensor 66 for detecting the temperature of the hot water heater energization control for energizing the sub-heater 64.

  When hot water is sold, hot water valve 25 is opened and hot water is discharged from hot water discharge port 24. Drinking water (cold water) corresponding to the discharged amount of hot water is supplied to hot water tank 61. The water is generally discharged to the bottom 62 a of the hot water tank 61. This is because the specific gravity of water is larger than that of hot water, and the drinking water discharged to the bottom 62a of the hot water tank 61 remains in the bottom 62a as it is, so that it is discharged from the hot water outlet 24 of the hot water tank 61 when selling hot beverages. This is to prevent the temperature of hot water stored around the hot water discharge port 24 from rapidly decreasing even when potable water corresponding to the amount of hot water is supplied to the hot water tank 61.

  In addition, in the cup type vending machine, in addition to the hot water tank 61 that stores hot water for hot beverage cooking by heating drinking water with the main heater 63 or the sub heater 64, ice used for cooking cold beverages is used. Back of the ice making machine that manufactures and stores the cooling device that supplies cooling refrigerant to the cooling water tank that cools the syrup (for example, power consumption 500 W) and the flavor card (sales merchandise display card) displayed on the front door Therefore, the power supply capacity that can always be used for heating and keeping hot water stored in the hot water tank 61 is only about 500 W.

  For this reason, in a cup type vending machine (for example, 100V, 15A) with a limited power supply capacity, two electric heaters, a main heater 63 and a sub heater 64, are provided, and a large amount is provided in the hot water tank 61 when hot beverages are continuously sold. In order to rapidly heat the hot water whose temperature has been lowered with the supplied drinking water, exclusive control for energizing the main heater 63 by stopping the operation of the cooling device that supplies the cooling refrigerant to the ice making machine and the cooling water tank is performed. It has been broken.

  Furthermore, in the cup type vending machine, the quality (taste and fragrance) of the beverage to be sold cannot be maintained when the temperature of the hot water used for cooking the hot beverage is lowered. The temperature is detected and a temperature signal is output to the control unit 67. The control unit 67 energizes the sub-heater 64 based on the temperature signal output from the temperature sensor 66 to set the temperature of the hot water to a predetermined temperature (for example, 95 ° C to 97 ° C). The hot water supplied from the hot water tank 61 to the coffee brewer or the mixing bowl is kept at a high temperature.

  When the hot beverage selection button of the cup type vending machine is pressed, the hot water valve 25 is opened, and hot water stored in the hot water tank 61 is discharged from the hot water discharge port 24, the float 31 descends. The low water level switch 33 that operates in conjunction with the output of the low water level signal to the control unit 67. When the control unit 67 receives a low water level signal from the low water level switch 33, the drinking water valve 14 is opened, and the drinking water is supplied from the water supply port 23 to the bottom 62 a of the tank body 62.

  When drinking water is supplied to the bottom 62a of the tank main body 62 of the hot water tank 61 and the temperature of the hot water is lowered, the controller 67 supplies the sub heater 64 with electricity supplied based on the temperature of the hot water detected by the temperature sensor 66. When hot water is heated and kept warm, hot drinks are continuously sold and a large amount of drinking water is supplied, and when the temperature of the hot water detected by the temperature sensor 66 further decreases, The operation of the cooling device that supplies the cooling refrigerant is stopped and the main heater 63 is energized to rapidly heat the hot water whose temperature has been lowered with the potable water supplied, and the temperature sensor 66 sets the upper limit temperature set value (for example, 97 ° C.). Until the temperature is detected.

  Thus, when the hot beverage selection button is pressed and the hot water valve 25 is opened by the hot beverage cooking signal, the hot water stored in the hot water tank 61 is discharged from the hot water discharge port 24 and the hot water pipe 26. The hot water, which is supplied to the coffee brewer or the mixing bowl through the hot water and used for cooking hot drinks and cooled down with the potable water supplied to the hot water tank 61, is heated by the sub heater 64 and stored.

  Further, when hot drinks are continuously sold and a large amount of potable water corresponding to the amount of hot water discharged from the hot water discharge port 24 of the hot water tank 61 is continuously discharged to the bottom 62a of the hot water tank 61 and supplied, The temperature of the hot water is further lowered by the large amount of drinking water, and the control unit 67 stops the operation of the cooling device that supplies the cooling refrigerant to the ice making machine and the cooling water tank based on the temperature signal detected by the temperature sensor 66. The exclusive control is performed to rapidly heat the hot water whose temperature is lowered by energizing the main heater 63.

  Further, as shown in FIG. 9, two electric heaters 73 and 74 having a power consumption of 500 W are vertically arranged, and a temperature sensor 75 for energization control of the electric heater 73 is disposed near the water outlet 24 water level. A hot water supply device 70 is also used, which includes a hot water tank 71 in which a temperature sensor 76 for energization control is disposed above the water supply port 23.

  When the hot beverage selection button of the cup type vending machine is pressed, the hot water valve 25 is opened, and hot water stored in the hot water tank 71 is discharged from the hot water discharge port 24, the float 31 descends. The low water level switch 33 that operates in conjunction with the output of the low water level signal to the control unit 77. When the control unit 77 receives a low water level signal from the low water level switch 33, the drinking water valve 14 is opened, and the drinking water is supplied in such a manner that the drinking water is discharged from the water supply port 23 to the bottom 72 a of the tank body 72.

  When drinking water is supplied to the bottom portion 72a, hot water whose temperature has been lowered with the drinking water supplied by energizing the electric heater 74 based on the temperature of the hot water detected by the temperature sensor 76 is kept warm. Is continuously sold and a large amount of drinking water is supplied, and when the temperature of the hot water detected by the temperature sensor 75 is lowered, the operation of the cooling device that supplies the cooling refrigerant to the ice making machine and the cooling water tank is stopped, and the electric heater 73 is stopped. , 74 is heated rapidly until hot water whose temperature has been lowered with drinking water supplied in large quantities by exclusive control to energize 74, and temperature sensors 75, 76 detect an upper limit temperature set value (eg, 97 ° C.). Let

JP-A-8-315244

  However, the top plate 62b of the tank body 62 of the hot water tank 61 is provided with energization terminals for the high water level switch 32, the low water level switch 33, the main heater 63, and the sub heater 64 that operate in conjunction with the raising and lowering of the float 31. A hot water outlet 24 to which the hot water valve 25 is attached is provided at the upper part of 62c. Therefore, it is difficult to insulate by attaching a heat insulating material to the top of the top plate 62b and the side plate 62c, and the middle and lower part of the side plate 62c that can easily cover and insulate the surrounding by attaching the heat insulating material, Even if the amount of heat radiation is larger than that of the bottom plate 62d and the temperature of the hot water around the temperature sensor 65 falls below a predetermined temperature (for example, 95 ° C. to 97 ° C.), the temperature of the hot water around the temperature sensor 66 is a predetermined temperature (for example, 95 ° C.). ˜97 ° C.). In such a case, the energization control for the main heater 63 and the sub heater 64 is performed based on the temperature of hot water detected by the temperature sensor 66, so that the main heater 63 or the sub heater 64 is not energized, and the hot beverage There is a possibility that the quality (taste and scent) of the beverage to be sold cannot be maintained due to a decrease in the temperature of hot water used for cooking. In addition, the number of cups that can be sold continuously is reduced.

  In the hot water tank 71, the energization control of the electric heater 73 is performed based on the hot water temperature detected by the temperature sensor 75, and the energization control of the electric heater 74 is controlled to the hot water temperature detected by the temperature sensor 76. Therefore, even if the temperature sensor 75 detects the boiling temperature of the hot water (for example, 100 ° C.), the temperature of the hot water detected by the temperature sensor 76 is a predetermined temperature (for example, 95 ° C. to 95 ° C.). When the temperature is lower than 97 ° C., there is an inconvenience that energization to the electric heater 74 is continued and the hot water is continuously heated.

  Furthermore, even when any of the electric heater 73, the temperature sensor 75, or the electric heater 74, the temperature sensor 76 has a malfunction or the like, energization is continued and the hot water continues to be heated, causing boiling or emptying. There is a fear.

  The present invention has been made to solve the above-described problems, and can continuously discharge hot water suitable for selling hot beverages, and can prevent abnormal heating. It aims at providing a hot-water supply apparatus.

In order to achieve the above object, a hot water supply apparatus according to claim 1 of the present invention includes a control unit that controls hot water stored in a hot water tank to a predetermined temperature by temperature detection by a temperature sensor and heating by an electric heater. A hot water supply apparatus for discharging hot water from a hot water discharge port provided at the top of the hot water tank and supplying drinking water in an amount corresponding to the discharged hot water from a water supply port provided at the bottom of the hot water tank;
The temperature sensor includes a first temperature sensor and a second temperature sensor provided at a position different from the first temperature sensor,
The control unit controls energization of the heater based on the temperature of hot water detected by the first temperature sensor and the second temperature sensor.

  Further, the hot water supply apparatus according to claim 2 of the present invention is the above-mentioned claim 1, further provided with a third temperature sensor, wherein the control unit includes the first temperature sensor, the second temperature sensor, and the third temperature. The heater is energized and controlled based on the temperature of hot water detected by the sensor.

According to a third aspect of the present invention, there is provided the hot water supply apparatus according to the first or second aspect, wherein the electric heater includes a main heater with high power consumption and a sub-heater with lower power consumption than the main heater. Become
When the power consumption of the main heater is high with respect to the power supply capacity of the device provided with the hot water supply device, the control unit can control the electric power of the device by exclusive control when energizing the main heater. The operation of a part of the parts is stopped.

  According to the first aspect of the present invention, there is provided a control unit that controls the hot water stored in the hot water tank to a predetermined temperature by temperature detection by the temperature sensor and heating by the electric heater, and the hot water spout provided at the upper part of the hot water tank. In the hot water supply apparatus which discharges hot water from an outlet and supplies drinking water in an amount corresponding to the discharged hot water from a water supply port provided at the bottom of the hot water tank, the temperature sensor includes a first temperature sensor and the first temperature sensor. And a second temperature sensor provided at a different position from the temperature sensor, wherein the control unit controls energization of the heater based on the temperature of the hot water detected by the first temperature sensor and the second temperature sensor. Thus, it is possible to provide a hot water supply apparatus that can continuously discharge hot water suitable for selling hot beverages and that can prevent abnormal heating.

  According to a second aspect of the present invention, a third temperature sensor is further provided, and the control unit controls the temperature of the hot water detected by the first temperature sensor, the second temperature sensor, and the third temperature sensor. Based on the energization control of the heater based on the above, temperature control with higher accuracy becomes possible, high-temperature hot water suitable for selling hot beverages can be continuously discharged, and abnormal heating can be prevented. It is possible to provide a hot water supply device that can be used.

  According to a third aspect of the present invention, the electric heater includes a main heater with high power consumption and a sub-heater with lower power consumption than the main heater. The power consumption of the main heater is determined by the hot water supply device. When the ratio to the power capacity of the equipment provided is high, the control unit, when energizing the main heater, by stopping the operation of some of the electrical components of the equipment by exclusive control, With equipment such as cup-type vending machines with limited power supply capacity, it is possible to energize the main heater, which consumes a large amount of power, in order to rapidly heat hot water whose temperature has dropped significantly with a large amount of drinking water supplied. Become.

It is a schematic diagram of a cup type vending machine provided with a hot water supply apparatus according to the present invention. It is a schematic diagram which shows the hot water supply apparatus which concerns on Embodiment 1 of this invention. It is a sub-heater energization control parameter figure of the hot-water supply apparatus shown in FIG. FIG. 3 is a main heater energization control parameter diagram of the hot water supply apparatus shown in FIG. 2. It is a schematic diagram which shows the hot water supply apparatus which concerns on Embodiment 2 of this invention. It is a sub heater energization control parameter figure of the hot-water supply apparatus shown in FIG. FIG. 6 is a main heater energization control parameter diagram of the hot water supply apparatus shown in FIG. 5. It is a schematic diagram which shows the conventional hot-water supply apparatus. It is a schematic diagram which shows the conventional hot-water supply apparatus.

Hereinafter, a preferred embodiment of a hot water supply apparatus according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, the same reference numerals are used for the same configuration as the conventional one.
(Embodiment 1)
FIG. 1 is a schematic view of a cup type vending machine provided with a hot water supply apparatus according to an embodiment of the present invention, and FIG. The cup-type vending machine 1 illustrated here cooks a hot beverage or a cold beverage according to a user's selection after inserting money, and pours it into a cup C placed on a bend stage 47. . In the machine, there are a water reservoir 12, a cooling water tank 15, a carbonator 18, an auger type ice making machine 19, a hot water supply device 20, a hot water tank 21, a coffee bean canister 41, a mill 42, a coffee brewer (regular coffee extraction device) 43, and a powder raw material. A canister 44, a mixing bowl 45, and the like are provided.

  The water reservoir 12 is for supplying drinking water (tap water) to the carbonator 18, the auger ice making machine 19, and the hot water tank 21. When the water supply valve 11 is opened, the drinking water is stored in the water reservoir 12, and the water pump When the drinking water valve 14 is opened by driving 13, drinking water is supplied to the hot water tank 21.

  An evaporator (not shown) is immersed in the cooling water of the cooling water tank 15, and when a cooling refrigerant is supplied from a cooling device (not shown), an ice bank is formed around the evaporator by the heat of evaporation of the refrigerant. (Ice lump) is generated, and the cooling water is maintained at approximately 0 ° C. by the heat of fusion of this ice bank.

  The carbonator 18 is immersed in the cooling water of the cooling water tank 15 and dissolves the carbon dioxide gas supplied from the carbon dioxide gas cylinder 16 in the drinking water supplied from the water reservoir 12 to obtain carbonated water. The syrup tank 17 stores syrup, and the syrup is pushed out by the pressure of carbon dioxide supplied from the carbon dioxide cylinder 16, cooled in the cooling water tank 15, and poured into the cup C from the nozzle 46.

  The auger type ice making machine 19 has an ice making unit and an ice storage, ice making the potable water supplied from the water reservoir 12 with the cooling refrigerant supplied from the cooling device to the ice making unit, and storing it in the ice storage. When the beverage is sold, the ice stored in the ice storage is supplied to the cup C.

  As shown in FIG. 2, the hot water supply device 20 includes a hot water tank 21 and a control unit 34. The hot water tank 21 is a water supply that supplies the drinking water supplied from the water reservoir 12 to the bottom 22a of the hot water tank 21 when the tank body 22 for storing hot water and the water pump 13 are operated and the drinking water valve 14 is opened. Hot water that is provided at the top of the opening 23 and the side plate 22c of the hot water tank 21 and that opens the hot water valve 25 discharges the hot water stored therein and supplies it to the coffee brewer 43 and the mixing bowl 45 via the hot water pipeline 26. A discharge port 24 is provided.

  In the position below the hot water discharge port 24 and closer to the hot water discharge port 24 than the water supply port 23, the power consumption is obtained by rapidly heating hot water whose temperature has been lowered by the supplied drinking water when energized. A large main heater 27 (for example, 1000 W of power consumption) is provided, and at a position below the main heater 27 and close to the water supply port 23, the entire hot water stored in the hot water tank 21 is heated when energized. A sub-heater 28 (for example, power consumption 500 W) that has lower power consumption than the main heater 27 is provided.

  Further, in the vicinity of the water level where the hot water discharge port 24 is provided, a hot water temperature displayed on a hot water temperature display (not shown) provided on the front door of the cup type vending machine 1 and a hot beverage selection button are displayed. There is provided a temperature sensor 29 (first temperature sensor) that detects the temperature of hot water for beverage display control (for example, 85 ° C. or less) and the temperature used for energization control of the main heater 27 or the sub heater 28. A temperature sensor 30 (second temperature sensor) for detecting a temperature used for energization control of the main heater 27 or the sub-heater 28 is also provided near the water supply port 23 provided on the bottom 22a of the hot water tank 21 below the temperature sensor 29. Yes.

  The position where the temperature sensor 30 is provided is a position at which suitable energization control can be performed on the main heater 27 or the sub heater 28 based on the temperature of hot water detected by the temperature sensor 30 (for example, from the start of continuous sales of hot beverages). It is preferable to provide at a position where the temperature at which energization of the sub-heater 28 starts can be detected with about two cups, and at a position obtained from each experimental result with the hot water tank shape. The top plate 22b of the tank body 22 is provided with a float 31 that moves up and down in conjunction with changes in the amount of hot water, a high water level switch 32 that operates in conjunction with the up and down movement of the float 31, and a low water level switch 33.

  Based on various signals such as a temperature signal output from the temperature sensors 29 and 30, a water level signal output from the low water level switch 33, and the like, the control unit 34 controls the water pump 13, the drinking water valve 14, and the hot water valve 25. The energization control of the main heater 27, the sub heater 28, a cooling device (not shown), and the like is performed.

  The coffee brewer 43 extracts the coffee liquid by pouring high-temperature hot water supplied from the hot water tank 21 into ground coffee beans obtained by grinding the coffee beans supplied from the coffee bean canister 41 with the mill 42.

  A mixing bowl 45 is connected to the coffee brewer 43, and the coffee liquid extracted from the coffee brewer 43 is mixed with sugar and cream supplied from the powder raw material canister 44, and a coffee drink is poured into the cup C from the nozzle 46.

  In the cup type vending machine 1 described above, when the user inserts money and presses a selection button for a hot beverage, for example, a selection button for a hot coffee beverage, the control unit 34 cooks the hot coffee beverage. Output a signal. In response to a signal output from the control unit 34, the coffee bean canister 41 first supplies the coffee beans to the mill 42, and the ground coffee beans ground by the mill 42 are supplied to the coffee brewer 43. When the hot water valve 25 of the hot water tank 21 is opened, the hot water heated to a high temperature and kept in the hot water tank 21 is discharged from the hot water discharge port 24 and ground in the coffee brewer 43 through the hot water pipe 26. Supplied to the beans. In the coffee brewer 43, a coffee mixture is obtained by dissolving coffee components from ground coffee beans in hot water. When the mixture is filtered with a paper filter, a coffee solution containing the coffee components is extracted. The coffee liquid extracted by the coffee brewer 43 is supplied to the mixing bowl 45, and is mixed with the sugar and cream supplied from the powder raw material canister 44 in the mixing bowl 45 to become a coffee drink, and the cup placed on the bend stage 47. C is poured into the nozzle C from the nozzle 46 and delivered to the user of the cup type vending machine 1.

  When the hot beverage selection button of the cup type vending machine 1 is pushed in this way, the hot water valve 25 is opened and the hot water stored in the hot water tank 21 is discharged from the hot water discharge port 24, the float 31 is lowered, and the low water level switch 33 that operates in conjunction with the descent of the float 31 outputs a low water level signal to the control unit 34. When the control unit 34 receives a low water level signal from the low water level switch 33, the control unit 34 operates the water pump 13 to open the drinking water valve 14 and supplies the drinking water stored in the water reservoir 12 to the hot water tank 21. The drinking water supplied from the water reservoir 12 is supplied in such a manner that it is discharged from a water supply port 23 provided at the bottom 22a of the hot water tank 21. In this way, the amount of drinking water corresponding to the amount of hot water discharged from the hot water discharge port 24 is supplied from the water supply port 23 to the bottom 22 a of the hot water tank 21.

  The temperature sensors 29 and 30 detect the temperature of hot water that has been lowered by supplying drinking water to the hot water tank 21, and the controller 34 controls the energization of the main heater 27 or the sub heater 28 based on this temperature signal to supply drinking water. 3 is a sub-heater 28 energization control parameter diagram of the hot water supply apparatus 20 shown in FIG. 3, and a hot water supply apparatus shown in FIG. 20 main heater 27 energization control parameter diagram will be described.

  First, as shown in the energization conditions of FIG. 3, the main heater 27 is energized, or one of the temperature sensor 29 (first temperature sensor) and the temperature sensor 30 (second temperature sensor) is 97 ° C. or higher. The sub-heater 28 is not energized when the temperature is detected, or when both the temperature sensor 29 and the temperature sensor 30 detect a temperature of 95 ° C. or higher. Further, as shown in the energization conditions of FIG. 4, when the temperature sensor 29 detects a temperature of 95 ° C. or higher, or when the temperature sensor 30 detects a temperature of 93 ° C. or higher, the main heater 27 Is not energized.

  Then, a hot beverage selection button is pressed, the hot water valve 25 is opened, and hot water stored in the hot water tank 21 is discharged from the hot water discharge port 24, corresponding to the hot water discharge amount discharged from the hot water discharge port 24. When a sufficient amount of drinking water (cold water) is supplied from the water supply port 23 to the bottom 22a of the hot water tank 21, drinking water having a specific gravity greater than that of hot water remains at the bottom 22a, and firstly the temperature of the hot water around the temperature sensor 30 decreases. Then, the temperature of the hot water around the temperature sensor 29 decreases.

  Then, as shown in the sub heater 28 energization control parameter diagram of FIG. 3, the temperature sensor 29 detects a temperature of 95 ° C. or less and the temperature sensor 30 detects a temperature of 93 ° C. or less while the main heater 27 is not energized. If the temperature sensor 29 detects a temperature of 93 ° C. or lower while the main heater 27 is not energized, and the temperature sensor 30 detects a temperature of 95 ° C. or lower, the control unit 34 controls the sub heater 28 to be energized. Do. A temperature sensor 29 provided near the water level of the hot water discharge port 24 detects a temperature of 93 ° C. or lower, and is provided near the water supply port 23 provided on the bottom 22a of the hot water tank 21 below the temperature sensor 29. When the temperature sensor 30 detects a temperature of 95 ° C. or lower, the control parameter for the control unit 34 to energize the sub-heater 28 is difficult to insulate by attaching a heat insulating material on the top plate 22b or the side plate 22c. The amount of heat dissipation is larger than that of the middle and lower portions of the side plate 22c and the bottom plate 22d, which is easy to cover and insulate by covering with the heat insulating material, and the temperature of the hot water around the temperature sensor 29 is This is because the temperature may be lower than the temperature.

  Thus, when drinking water is supplied from the water supply port 23 to the bottom 22a of the hot water tank 21, first, the temperature of the hot water stored in the bottom 22a of the hot water tank 21 is lowered, so that the temperature sensor 30 is 93 ° C. The following temperature can be detected at an early stage, and the hot water whose temperature has decreased can be heated at an early stage by energizing the sub-heater 28 provided at a position near the water supply port 23 provided at the bottom 22a of the hot water tank 21. Further, even if the temperature of the hot water around the temperature sensor 29 decreases due to heat radiation from the top plate 22b of the tank body 22 and the temperature sensor 29 detects a temperature of 93 ° C. or lower, the sub heater 28 is energized and the temperature decreases. Hot water can be heated early to keep warm.

  Furthermore, when the selection button of the hot beverage is continuously pressed, that is, when the so-called continuous sale of the hot beverage is performed, a large amount of hot water is discharged from the hot water discharge port 24 in a short time. A large amount of potable water corresponding to is supplied to the bottom 22a of the hot water tank 21 from the water supply port 23, and the temperature of hot water around the temperature sensor 30 and the temperature sensor 29 further decreases.

  Then, as shown in the main heater 27 energization control parameter diagram of FIG. 4, when the temperature sensor 29 detects a temperature of 93 ° C. or lower and the temperature sensor 30 detects a temperature of 90 ° C. or lower, the control unit 34 sets the power supply capacity. The exclusive cup cup vending machine 1 (for example, 100V, 15A) has an exclusive control to stop the operation of the cooling device that is a part of the electrical component, and the temperature is supplied with a large amount of drinking water supplied. In order to rapidly heat the hot water with a large drop in power, the main heater 27 with high power consumption (eg, 1000 W) is energized.

  In this way, hot drinks are continuously sold, a large amount of hot water is discharged from the hot water discharge port 24 in a short time, and a large amount of drinking water (cold water) corresponding to the discharged hot water amount is supplied to the water supply port 23. To the bottom 22a of the hot water tank 21, the temperature of hot water from the middle to the upper part of the hot water tank 21 is greatly reduced, the temperature sensor 29 detects a temperature of 93 ° C. or lower, and the temperature sensor 30 is a temperature of 90 ° C. or lower. Is detected, the main heater 27 provided at a position below the hot water discharge port 24 and closer to the hot water discharge port 24 than the water supply port 23 is energized, and the hot water tank 21 is limited to be stored above the main heater 27 and above. Since a large amount of hot water can be rapidly heated, high-temperature hot water suitable for selling hot beverages can be continuously discharged.

  As described above, the drinking water (cold water) is normally supplied from the water supply port 23 and stays at the bottom 22a of the hot water tank 21. First, the temperature of the hot water around the temperature sensor 30 is lowered, so that the temperature sensor 29 is 95. When the temperature sensor 30 detects a temperature of 93 ° C. or less while detecting the temperature of ℃ or less, the control unit 34 performs control to energize the sub-heater 28 and heats the hot water whose temperature has decreased to the hot water tank 21 at an early stage. The temperature of the hot water stored can be constantly maintained at a predetermined temperature (for example, 95 ° C. to 97 ° C.), and the hot water supplied to the coffee brewer 43 and the mixing bowl 45 can be kept at a high temperature.

  Moreover, although the temperature of the hot water stored in the upper part of the hot water tank 21 may fall below the temperature of the hot water stored in the lower part by the heat radiation from the top plate 22b, etc., the temperature sensor 29 is 93 degrees C or less temperature. When the temperature sensor 30 detects a temperature of 95 ° C. or less, the control unit 34 performs control to energize the sub-heater 28 and heats the hot water whose temperature has been lowered, so that it is stored in the hot water tank 21. By constantly maintaining the temperature of the hot water at a predetermined temperature (for example, 95 ° C. to 97 ° C.) and keeping the hot water supplied to the coffee brewer 43 and the mixing bowl 45 at a high temperature, continuous hot water suitable for selling hot beverages is provided. And can be discharged.

  Furthermore, if the sub-heater 28 is energized at a temperature close to the boiling temperature of the hot water (for example, 100 ° C.), the hot water may boil or empty, but both the temperature sensor 29 and the temperature sensor 30 are 95 ° C. or lower. Since the sub heater 28 is energized in a state where it is detected, it is possible to provide the hot water supply device 20 that can prevent abnormal heating of the hot water tank 21.

  In this way, the hot water heated by energizing the sub-heater 28 rises to the upper part of the hot water tank 21 before boiling around it, and both the temperature sensor 29 and the temperature sensor 30 detect a temperature of 95 ° C. or more. The energization to the sub heater 28 is stopped. In addition, when either the temperature sensor 29 or the temperature sensor 30 detects a temperature of 97 ° C. or higher, the energization to the sub-heater 28 is stopped. Therefore, even when a malfunction of the temperature sensor or the electric heater occurs, the hot water tank 21 A hot water supply device 20 that can prevent abnormal heating can be provided.

As described above, according to the first embodiment of the present invention, the temperature of the hot water stored in the hot water tank and the beverage temperature can be kept constant without being affected by the deterioration of the form of the hot water tank or the use environment. . Moreover, boiling and abnormal heating of hot water stored in the hot water tank can be prevented. Furthermore, even when a malfunction occurs in a part of the hot water supply apparatus, boiling of the hot water and abnormal heating can be prevented.
(Embodiment 2)
Next, a hot water supply apparatus according to Embodiment 2 of the present invention will be described with reference to FIGS. The same reference numerals are used for the same configurations as those in the first embodiment. In the hot water supply apparatus 20 of the first embodiment, a temperature sensor 29 (first temperature sensor) provided near the water level of the hot water discharge port 24 and a temperature sensor 30 provided near the water supply port 23 below the temperature sensor 29. Based on the temperature of the hot water detected by the (second temperature sensor), the control unit 34 controls the energization of the main heater 27 or the sub-heater 28 to heat the hot water whose temperature has been lowered by the supply of drinking water. For example, in the hot water supply apparatus 50 of the second embodiment, the temperature is between the temperature sensor 29 and the temperature sensor 30 as shown in the schematic diagram of the hot water supply apparatus in FIG. A sensor 51 (third temperature sensor) is provided, and the controller 52 controls the main heater 27 or the sub heater 28 based on the temperature sensor 29, the temperature sensor 30, and the temperature of the hot water detected by the temperature sensor 51. The high-temperature water (e.g., 95 ° C. to 97 ° C.) temperatures in electric control to supply drinking water and heating the hot water drops are to be kept as.

  The control unit 52 controls the energization of the main heater 27 or the sub heater 28 based on the temperature of the hot water detected by the temperature sensor 29, the temperature sensor 30, and the temperature sensor 51. The sub heater 28 energization control of the hot water supply apparatus 50 shown in FIG. This will be described with reference to the parameter diagrams and the main heater 27 energization control parameter diagram of the hot water supply apparatus 50 shown in FIG.

  First, as shown in the energization condition of FIG. 6, the main heater 27 is energized, or the temperature sensor 29 (first temperature sensor), the temperature sensor 51 (third temperature sensor), and the temperature sensor 30 (second sensor). If any of the temperature sensors) detects a temperature of 97 ° C. or higher, or if any of the temperature sensor 29, the temperature sensor 51, and the temperature sensor 30 detects a temperature of 95 ° C. or higher, the sub heater 28 is used. Is not energized. Further, as shown in the energization conditions of FIG. 7, either the temperature sensor 29 or the temperature sensor 51 detects a temperature of 95 ° C. or higher, or the temperature sensor 30 detects a temperature of 93 ° C. or higher. If it is, the main heater 27 is not energized.

  Then, a hot beverage selection button is pressed, the hot water valve 25 is opened, and hot water stored in the hot water tank 21 is discharged from the hot water discharge port 24, corresponding to the hot water discharge amount discharged from the hot water discharge port 24. When a sufficient amount of drinking water (cold water) is supplied from the water supply port 23 to the bottom 22a of the hot water tank 21, drinking water having a specific gravity greater than that of hot water remains at the bottom 22a, and firstly the temperature of the hot water around the temperature sensor 30 decreases. Then, the temperature of the hot water around the temperature sensor 51 is lowered, and the temperature of the hot water around the temperature sensor 29 is further lowered.

  Then, as shown in the sub heater 28 energization control parameter diagram of FIG. 6, the temperature sensor 29 and the temperature sensor 51 detect a temperature of 95 ° C. or lower while the main heater 27 is not energized, and the temperature sensor 30 is 93 ° C. or lower. The temperature sensor 29 and the temperature sensor 30 detect a temperature of 95 ° C. or lower and the temperature sensor 51 detects a temperature of 93 ° C. or lower while the main heater 27 is not energized, or When the temperature sensor 29 detects a temperature of 93 ° C. or less while the main heater 27 is not energized, and the temperature sensor 51 and the temperature sensor 30 detect a temperature of 95 ° C. or less, the control unit 52 performs control to energize the sub heater 28. Do.

  When the temperature detected by the temperature sensor 29 or the temperature sensor 51 detects a temperature lower than the temperature detected by the temperature sensor 30, the control parameters for the control unit 52 to energize the sub heater 28 are the top plate 22b and the side plate. It is difficult to insulate by affixing a heat insulating material on the upper part of 22c, and the amount of heat radiation becomes larger than the lower part of the side plate 22c and the bottom plate 22d, which is easy to cover and insulate by adhering the heat insulating material, This is because the temperature of hot water around the temperature sensor 29 and the temperature sensor 51 may fall below the temperature of hot water around the temperature sensor 30.

  Thus, in addition to the temperature sensor 29 provided near the water level of the hot water discharge port 24 and the temperature sensor 30 provided near the water supply port 23 below the temperature sensor 29, the temperature sensor 29 and the temperature sensor 39 A temperature sensor 51 is provided between them, and the control unit 52 controls the energization of the main heater 27 or the sub heater 28 based on the temperature of the hot water detected by the temperature sensor 29, the temperature sensor 30, and the temperature sensor 51 to supply drinking water. By heating the hot water whose temperature has dropped in this way and keeping it as high temperature hot water (for example, 95 ° C. to 97 ° C.), it becomes possible to control the temperature with higher accuracy, and high temperature hot water suitable for selling hot beverages can be obtained. It is possible to provide a hot water supply device 50 that can discharge continuously and can prevent abnormal heating.

  In addition, although demonstrated in embodiment which provided three temperature sensors, you may make it provide four or more temperature sensors.

DESCRIPTION OF SYMBOLS 1 Cup type vending machine 12 Water reservoir 14 Drinking water valve 20 Hot water supply device 21 Hot water tank 22 Tank main body 22a Bottom 23 Water supply port 24 Hot water discharge port 25 Hot water valve 26 Hot water pipe 27 Main heater 28 Sub heater 29 Temperature sensor (1st temperature) Sensor)
30 Temperature sensor (second temperature sensor)
34 control part 50 hot-water supply apparatus 51 temperature sensor (3rd temperature sensor)
52 Control unit

Claims (3)

A controller that controls the hot water stored in the hot water tank to a predetermined temperature by detecting the temperature with a temperature sensor and heating with an electric heater is used to discharge the hot water from a hot water outlet provided at the upper part of the hot water tank. In a hot water supply apparatus for supplying drinking water in an amount corresponding to the hot water from a water supply port provided at the bottom of the hot water tank,
The temperature sensor includes a first temperature sensor and a second temperature sensor provided at a position different from the first temperature sensor,
The controller is configured to control energization of the heater based on the temperature of hot water detected by the first temperature sensor and the second temperature sensor.   Further, a third temperature sensor is provided, and the controller controls the energization of the heater based on the temperature of the hot water detected by the first temperature sensor, the second temperature sensor, and the third temperature sensor. The hot water supply apparatus according to claim 1. The electric heater consists of a main heater with high power consumption and a sub-heater with low power consumption than the main heater,
When the power consumption of the main heater is high with respect to the power supply capacity of the device provided with the hot water supply device, the control unit can control the electric power of the device by exclusive control when energizing the main heater. The hot water supply apparatus according to claim 1 or 2, wherein operation of a part of the parts is stopped.

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