JP2570028B2 - Hot water storage system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply type hot water supply apparatus having one tank for both heating and water use and two tanks dedicated to a sump.

[0002]

2. Description of the Related Art Conventionally, as this kind of hot water storage type hot water supply device,
For example, the one shown in FIG.
-18454). This hot water supply device has an electric heater 1
The first hot-water storage tank 11 containing the 4 and the second
The third hot water storage tanks 12 and 13 are erected, and the hot water supply pipe 15 is provided at the top of the first and second hot water storage tanks 11 and 12 and the water is supplied to the bottom of the first and third hot water storage tanks 11 and 13 via the three-way valve 17. Piping 1
6 are connected to each other, and the bottom of the second hot water storage tank 12 and the top of the third hot water storage tank 13 are connected by a pipe 18. One end 1 of a circulation pipe 19 provided with a pump 20 and a condenser 21 interposed therebetween.
9a is connected to the bottom of the first hot water storage tank 11, while the other end 19 of the circulation pipe 19 branched into two via a three-way valve 22.
b and 19c are connected to the bottoms of the first and third hot water storage tanks 11 and 13, respectively. Further, the electric heater is controlled by a controller 25 which receives a detection signal and the like from a temperature sensor 23 for detecting a top water temperature in the first hot water storage tank 11 and a temperature sensor 24 for detecting a bottom water temperature in the third hot water storage tank 13. 14. The operation of the condenser 21, the pump 20, and the three-way valves 17, 22 is controlled.

[0003] The controller 25 operates the electric heater 14 with inexpensive nighttime electric power to heat all the water in the first hot water storage tank 11 to the boiling temperature (for example, 80 ° C). Next, the three ports of the three-way valve 17 are fully closed, and the three-way valve 22 is switched so as to communicate with the third hot water storage tank 13 side.
9 is started to transfer the hot water from the top of the first hot water storage tank 11 to the second hot water storage tank 12 and to transfer the water in the third hot water storage tank 13 from the bottom thereof to the first hot water storage tank 11. And the temperature sensor 23 of this tank is
When the temperature of the water surface rising due to the transfer is detected, the pump 20 is stopped to end the transfer. Thereafter, the water filled in the first hot water storage tank 11 is again boiled by the electric heater 14 and transferred to the second hot water storage tank 12 in the same manner. By repeating this operation, the boiled water is stored in the third hot water storage tank 13.
When the temperature reaches the bottom of the tank, the temperature sensor 24 of the tank detects the temperature of the hot water, whereby the controller 25 determines that the boiling water has accumulated in all three tanks and stops the electric heater 14. , Finish the kettle.

At the time of tapping in the daytime, the controller 25 switches the three-way valve 17 to the first hot water storage tank 11 side,
Then, all ports 2 are closed to supply tap water from the water supply pipe 16, and a hot water tap (not shown) of the hot water supply pipe 15 is opened. Then, the boiling water in the first hot water storage tank 11 is
The water is pushed up by the water supply from the bottom and is discharged from the hot water supply pipe. When the water temperature in the tank decreases due to hot water supply and water supply, all ports of the three-way valve 17 are closed, the three-way valve 22 is switched to the first hot water storage tank 11 side, the pump 20 is started, and the The compressor of the refrigeration circuit (not shown) is started. Then, the water in the tank 11 is
And heated to about 30 ° C. When hot water is to be discharged from the second hot water storage tank 12, all ports of the three-way valve 22 are closed, the three-way valve 17 is switched to the third hot water storage tank 13 side, and tap water is supplied from the water supply pipe 16. Then
The hot water in the third hot water storage tank 13 is pushed up by the supply of water from the bottom and is transferred to the bottom of the second hot water storage tank 12 via the pipe 18, and the hot water in the second hot water storage tank 12 is further pushed up and discharged from the hot water supply pipe 15. Is done. In addition, at the time of tapping in the daytime, tap water is transferred from the bottom of the third hot water storage tank 13 to the first hot water storage tank 11 along the same route as at night, in order to transfer the water heated by the additional heating by the condenser 21. It is performed appropriately.

[0005]

However, in the above conventional hot water storage type hot water supply apparatus, even in the transfer of water to the first hot water storage tank 11 in the daytime, the temperature sensor 23 at the tank top detects the temperature of tap water. Since the transfer is continued, the following problems occur. That is, for example, when water is transferred in a case where the temperature distribution in each tank is as shown in FIG. 3, all the water at 0 ° C. in the third tank 13 is transferred to the first tank 11, and
All the water at 30 ° C. in the tank 11 is transferred to the second tank 12,
Transfer continues until part of the 75 ° C. hot water in the second tank 12 is transferred to the third tank 13. Therefore, the second tank 1 after the transfer
The average hot water temperature T ₂ ′ of ₂ is T ₂ ′ = (30 ° C. × 100 l + 75 ° C.)
× 50 l) / 150 l = 45 ° C. However, if the hot water is discharged from the second hot water storage tank in this state, the hot water supplied will have a temperature of 45 ° C. and cannot be used for bathing in a bath that requires high-temperature hot water. Therefore, an object of the present invention is to perform the transfer of water only when the temperature of the hot water in the hot water tank after the transfer of the water is high, or when the hot water runs out, so as to prevent the hot water from running out of the hot water. An object of the present invention is to provide a hot water storage type hot water supply device that can prevent the hot water storage.

[0006]

In order to achieve the above object, a hot water supply type hot water supply apparatus of the present invention comprises a first hot water storage tank in which water is boiled by heating means 14 and 21, as shown in FIG. 11 and second and third hot water storage tanks 12 and 13 dedicated to the hot water pool are erected, and the first and second hot water storage tanks 11 and
A hot water supply pipe 15 is provided at the top of the hot water supply pipe 12 and a water supply pipe 16 is provided at the bottom of the first and third hot water storage tanks 11 and 13 via a switching valve 17.
And the bottom of the second hot water storage tank 12 and the top of the third hot water storage tank 13 are connected by a pipe 18, and one end 19 a of a circulation pipe 19 provided with a pump 20 is connected to the bottom of the first hot water storage tank 11. While the other end 19b of the circulation pipe 19, which branches into two via a three-way valve 22,
19c connected to the bottoms of the first and third hot water storage tanks 11 and 13, respectively, and provided with a controller 4 for controlling operations of the heating means 14, 21, the pump 20, the switching valve 17 and the three-way valve 22. In the above, the first and second hot water storage tanks 11 and 1
The first and second temperature sensors 1 and 2 for detecting the water temperatures T ₁ and T ₂ in the tank 2, respectively, and the third hot water storage tank 13 are provided at predetermined intervals in the vertical direction to detect the water temperature Ti in the tank. A plurality of third temperature sensors 3a to 3g,
a water amount detecting means 4 for obtaining the water amount X of the unheated water in the third hot water storage tank 13 based on whether or not the water temperature represented by the detection signals Ti of a to 3g is equal to or lower than a predetermined value; 2
Based on the water temperatures T ₁ and T ₂ indicated by the detection signals of the temperature sensors 1 and _2, when all of the water of the water amount X is transferred from the third hot water storage tank 13 to the first hot water storage tank 11 by the pump 20, the first hot water storage 'and tapping temperature calculation means 4 for calculating a, the hot water temperature calculating means temperature T ₂ calculated by the 4' second temperature T ₂ of the hot water storage tank 12 after transfer changed by water flowing from the tank 11 reaches a predetermined First determining means 4 for determining whether or not the temperature of the hot water is equal to or higher than T _0; and when the first determining means 4 determines no, the water amount X obtained by the water amount detecting means 14 is equal to a predetermined value X The two-way valve 22 is connected to the third hot water storage tank 13 when the second determination means 4 for determining whether the value is ₀ or more, and when either of the first and second determination means 4 determines positive. And the pump 20 is started to activate the first hot water storage tank 11 Characterized by comprising a transfer initiation means 4 for starting the transfer of water towards.

[0007]

Prior to the transfer of water from the third hot-water storage tank to the first hot-water storage tank, the water amount detecting means includes a third temperature sensor provided in the third hot-water storage tank at a predetermined interval in the vertical direction. The amount X of unheated water in the third hot water storage tank 13 is determined based on whether the water temperature Ti represented by the detection signals 3a to 3g is equal to or lower than a predetermined value. Next, the tap water temperature calculating means 4 calculates the water amount X based on the water temperatures T ₁ and T ₂ indicated by the detection signals of the first and second temperature sensors 1 and 2 provided in the first and second hot water storage tanks 11 and 12, respectively. When all the water is transferred from the third hot water storage tank 13 to the first hot water storage tank 11 by the pump 20,
The water temperature T ₂ ′ in the second hot water storage tank 12 after the transfer, which varies depending on the water flowing from the first hot water storage tank 11, is calculated. The first determining means 4 determines whether the calculated water temperature T ₂ ′ is equal to or lower than a predetermined hot water temperature T ₀ . Also, the first
When discriminating means 4 is determined to not, second determining means 4, the amount of water X obtained by the water amount detecting means 4 determines whether or not a predetermined value X ₀ or more. Then, the transfer start means 4 determines whether any of the first and second determination means 4, 4 has determined that
In the former the insert hot water temperature T ₀ or more high-temperature hot water is tapped, the hot breakage occurs with a small amount of hot water after the latter,
The three-way valve 22 is switched so as to communicate with the third hot water storage tank 13, the pump 20 is started, and the transfer of water toward the first hot water storage tank 11 is started. Therefore, the occurrence of low-temperature hot water and running out of hot water are prevented, and the usability of the apparatus is improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. FIG. 1 is a schematic diagram showing an example of a hot water supply type hot water supply apparatus. This hot water supply apparatus has the same members as FIG. 3 except that the installation of a temperature sensor and the function of a controller are different from those of the conventional example described in FIG. Have the same numbers. On the side wall of the third hot water storage tank 13, a water temperature Ti (i = 3 to 9) in the tank is provided as a third temperature sensor at a constant vertical interval from the top to the bottom.
Are provided with seven temperature sensors 3a to 3g. Also,
At the center of the side walls of the first and second hot water storage tanks 11 and 12, temperature sensors ₁ and ₂ for detecting water temperatures T ₁ and T ₂ in the respective tanks are provided as first and second temperature sensors. (See S1 in FIG. 2).

The controller 4 is a conventional controller 25 (FIG. 3).
), And also serves as a water amount detection unit, a tapping temperature calculation unit, first and second determination units, and a transfer start unit, which will be described later. That is, the controller 4 serves as the water amount detecting means, and the water temperature T represented by the detection signals of the temperature sensors 3a to 3g.
The amount X of unheated water in the third hot water storage tank 13 is determined based on whether or not i is equal to or lower than the maximum temperature of tap water supplied from the water supply pipe 16 (for example, 20 ° C.). In other words, since the water supply always accumulates on the bottom side of the tank, the detected water temperature Ti is 20
Calculate the amount of water X at the installation height of the temperature sensor as the unheated water below the temperature sensor below the temperature sensor (two-dot chain line of the tank)
(See S2 in FIG. 2). Further, the controller 4 serves as a hot water temperature calculating means, based on the water temperatures T ₁ , T ₂ indicated by the detection signals of the temperature sensors ₁ , _2, and all the water of the water amount X is pumped from the third hot water storage tank 13 by the pump 20. When the water is transferred to the first hot water storage tank 11, the water temperature T ₂ ′ in the second hot water storage tank 12 after the transfer, which varies depending on the water flowing from the first hot water storage tank 11, is calculated. That is, assuming that the volumes of the first and second tanks 11 and 12 are V ₁ and V ₂ , and the amount of transferred water is X, T ₂ ′ V ₂ = T ₁ X + T ₂ (V _2- X)
Holds, T ₂ ′ = {T ₁ X + T ₂ (V ₂ −X)} / V ₂
T ₂ ′ is calculated by the formula (see S3).

Further, the controller 4 determines whether the calculated water temperature T ₂ ′ is equal to or higher than a predetermined hot water temperature T ₀ (for example, 60 ° C.) as first determining means (FIG. 2). S4 reference) of, when it is determined that whether, as a second determination means, the amount of water X is a predetermined value, wherein it is determined whether or not the maximum amount of water X ₀ or more words causing no water shortage (see the S5) .
Then, when a positive judgment is made in either of the above judgments,
As the transfer start means, the three-way valve 22 is connected to the third hot water storage tank 13.
To the first side and start pump 20 to
The transfer of water toward the hot water storage tank 11 is started (S6
reference). It should be noted that the reason for starting the transfer with the former affirmative determination is that the water amount T ₂ ′ of the second hot water storage tank 12 after the transfer is the hot water temperature T
_The reason why the hot water is not disturbed at ₀ or more, and the reason why the transfer is opened with the latter positive judgment is because the remaining hot water amount is small and the hot water runs out unless the water is transferred and boiled in the first hot water storage tank 11. .

The operation of the hot water supply type hot water supply apparatus having the above configuration will be described with reference to FIG.
The following is described with reference to FIG. Hot water boiled by the electric heater 14 at night is stored in all the hot water storage tanks 11, 12, and 13 and supplied to the bottom of the first or third hot water storage tank through the water supply pipe 16 and the three-way valve 17 in the daytime. First by water
Or hot water supply pipe 1 from the top of second hot water storage tanks 11 and 12
The hot water is passed through 5. Third hot water storage tank 13 with hot water
When the tap water in the tank increases, the tap water is transferred to the first hot water storage tank 11 in order to heat the tap water to about 30 ° C. in the condenser 21. Prior to the transfer, the controller 4 receives the detection signals of the temperature sensors 3a to 3g provided in the third hot water storage tank 13 in the vertical direction in step S2, and the water temperature Ti represented by the signals is 20 ° C.
The amount X of the unheated water in the third hot water storage tank 13 is determined based on whether or not the following is true. Next, in step S3, after the transfer based on the water temperatures T ₁ and T ₂ indicated by the detection signals (see step S1) of the first and second temperature sensors 1 and 2 provided in the first and second hot water storage tanks 11 and 12, respectively. The water temperature T ₂ ′ in the second hot water storage tank 12 is calculated by the following equation. T ₂ ′ = {T ₁ X + T ₂ (V ₂ −X)} / V ₂

The controller 4 determines that the calculated water temperature T ₂ ′ is
It is determined in step S4 whether or not the temperature is equal to or higher than a predetermined hot water temperature T ₀ (60 ° C.). Then, when determining that affirmation, the process proceeds to step S6, as also transfer the water to the first hot water storage tank 11, the second hot-water tank hot water temperature T ₀ or more high-temperature hot water pointing from 12 possible tapping, the three-way valve 17 Are closed, the three-way valve 22 is switched to the first hot water storage tank 13 side, the pump 20 is started, and the transfer of water from the third hot water storage tank 13 to the first hot water storage tank 11 is started. This transfer is performed when the temperature sensor 23 at the top of the first hot water storage tank 11 detects a boundary surface level (water temperature) between water and hot water that rises during the transfer, or when the temperature sensor 3 at the bottom of the third hot water storage tank is used.
g is the level of the boundary between water and hot water that falls during transfer (hot water temperature)
The process ends when is detected. Thereafter, all ports of the three-way valve 22 are closed, the three-way valve 17 is switched to the third hot-water storage tank 13 side, and water is supplied from the water supply pipe 16 to the third hot-water storage tank 13 so that hot water in the second hot-water storage tank 12 is supplied. Temperature T
Hot water of ₀ or more is discharged from the top through the hot water supply pipe 15.

Meanwhile, when determining that N in Step S4, the process proceeds to step S5, the amount of water X obtained in step S3, it is determined whether or not a predetermined value X ₀ or more. If the determination is affirmative in step S5, the process proceeds to step S6, where it is determined that the water needs to be boiled because there is a risk of running out of water with a small amount of hot water.
Transfer of water toward the first hot-water storage tank 11 is started. This transfer is also completed in the same manner as described above, and the three-way valve 22 is closed with the first hot-water storage tank 11 with all ports of the three-way valve 17 closed.
Side, the pump 20 and the condenser 21 are started, and the water transferred to the first hot water storage tank 11 is heated to about 30 ° C. If the determination is negative in step S5, it is determined that there is sufficient hot water in the third hot water storage tank 13 and the hot water will not run out, and no water is transferred.

In this way, the frequency with which low-temperature hot water having a temperature lower than the hot water temperature (60 ° C.) is discharged from the hot water supply pipe 15 is greatly reduced, and the occurrence of running out of hot water is prevented, so that the usability as a hot water supply device is improved. However, it becomes very convenient for the user. In the above embodiment, the electric heater 14,
The controller 4, which controls the condenser 21, the pump 20, and the three-way valves 17, 22, also serves as the tapping temperature calculating means, the first and second discriminating means, and the transfer starting means. There is an advantage that it can be configured at low cost. In the above embodiment, the electric heater 14 and the condenser 21 are provided as the heating means, but any one of them may be used.

[0015]

As is apparent from the above description, the hot water supply type hot water supply apparatus of the present invention includes a first hot water storage tank having a first temperature sensor and a heating means, and a second temperature sensor dedicated to a hot water pool. A second hot water storage tank and a third hot water storage tank are erected, and a hot water supply pipe and a water supply pipe provided with a switching valve are respectively connected to the top and bottom of these tanks. In the control of the operation of the means by a controller, a plurality of third temperature sensors are provided in the third hot water storage tank, and the amount of unheated water in the tank is obtained by water amount detection means receiving detection signals of these sensors. When all the water is transferred to the first hot water storage tank by the pump, the water temperature in the second hot water storage tank after transfer, which is changed by the inflow water from the first hot water storage tank, is determined based on the water temperatures obtained by the first and second temperature sensors. Calculated by tapping temperature calculation means On the other hand, the first determination means determines whether or not the calculated water temperature is equal to or higher than the hot water temperature. When it is determined that the water temperature is not higher, the second determination means determines whether or not the water amount is equal to or higher than a predetermined value. When one of the determination means determines affirmative, the transfer start means switches the three-way valve to the third hot water storage tank side and starts the pump to start the transfer of water to the first hot water storage tank. In addition, the frequency at which hot water having a temperature lower than the hot water temperature is supplied is greatly reduced, and the occurrence of running out of hot water is prevented, and the usability as a hot water supply device is improved.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of a hot water supply type hot water supply apparatus of the present invention.

FIG. 2 is a flowchart showing an operation flow of the hot water storage type hot water supply apparatus.

FIG. 3 is a schematic diagram showing a conventional hot water storage type hot water supply apparatus.

[Explanation of symbols]

1. 1st temperature sensor, 2 ... 2nd temperature sensor, 3a-3g ...
Third temperature sensor, 4 ... controller, 11 ... first hot water storage tank,
12 ... second hot water storage tank, 13 ... third hot water storage tank, 14 ...
Electric heater, 15: Hot water supply pipe, 16: Water supply pipe, 17 ...
Three-way valve, 18… Piping, 19… Circulation pipe, 19a… One end,
19b: the other end, 20: pump, 21: condenser, 22: three-way valve.

Claims (1)

(57) [Claims] 1. A first hot water storage tank (11) in which water inside is heated by heating means (14, 21) and second and third hot water storage tanks (12, 13) dedicated to a hot water pool are erected. Hot water supply pipes (15) at the tops of the first and second hot water storage tanks (11, 12),
Switching valve at the bottom of the first and third hot water storage tanks (11, 13)
The water supply pipes (16) are connected via (17), respectively, and
The bottom of the hot water storage tank (12) and the top of the third hot water storage tank (13) are connected by a pipe (18), and one end (19a) of a circulation pipe (19) provided with a pump (20) is connected to the first hot water storage tank. The other end (19b, 1) of the circulation pipe (19) connected to the bottom of the tank (11) and branched into two via a three-way valve (22).
9c) are connected to the bottoms of the first and third hot water storage tanks (11, 13), respectively, and the operations of the heating means (14, 21), the pump (20), the switching valve (17) and the three-way valve (22) are performed. Controller to control
In the hot water supply type hot water supply apparatus provided with (4), the water temperature (T ₁ , T ₁ ) in the first and second hot water storage tanks (11, 12)
T ₂ ) and first and second temperature sensors (1 and 2) for detecting the water temperature (Ti) in the third hot water storage tank (13) at predetermined intervals in the vertical direction. Multiple third
The temperature in the third hot water storage tank (13) is determined based on whether the temperature sensors (3a to 3g) and the water temperature (Ti) indicated by the detection signals of the third temperature sensors (3a to 3g) are equal to or lower than a predetermined value. Water amount detecting means (4) for obtaining the water amount (X) of the water, and the water temperature (T ₁ , T ₂ ) represented by the water amount (X) and the detection signals of the first and second temperature sensors ( ₁ , ₂ ). The water having the above-mentioned water amount (X) is entirely pumped from the third hot water storage tank (13) by the pump (20).
First hot water storage tank when transferred to hot water storage tank (11)
(11) a tapping temperature calculating means (4) for calculating a water temperature (T ₂ ′) in the second hot water storage tank (12) after transfer, which varies depending on water flowing in from the tapping water; and a tapping temperature calculating means (4). A first method for determining whether or not the detected water temperature (T ₂ ′) is equal to or higher than a predetermined hot water temperature (T ₀ )
Determining means (4), when the first determining means (4) determines no, whether the water amount (X) obtained by the water amount detecting means (4) is equal to or more than a predetermined value (X ₀ ) When either of the first and second determining means (4) determines positive, the three-way valve (22) is connected to the third hot water storage tank (13). And a transfer start means (4) for starting the pump (20) to start transfer of water toward the first hot water storage tank (11).