JPH0752524Y2 - Hot water storage system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a hot water storage type hot water supply device.

(Prior Art) As a conventional example of a hot water storage type hot water supply device, for example, the actual open sho 63-1200
The device described in Japanese Patent No. 42 can be mentioned. In the device that uses a heat pump system as a heating source for hot and cold water,
A cylindrical closed hot water storage tank with a water supply pipe at the bottom and a hot water supply pipe at the top is provided, and when the calan at the tip of the hot water supply pipe is opened, the hot water is stored by pressing the tap water acting through the water supply pipe. The hot water in the tank is discharged from the upper side through the hot water supply pipe in a push-up manner, and at the same time, the same amount of water is supplied to the bottom side of the hot water storage tank through the water supply pipe.

In the hot water storage tank having the above configuration, the high temperature hot water is on the upper side,
Since low-temperature hot water is stored in a state of being separated on the bottom side, for example, multiple hot water temperature sensors are installed at appropriate intervals in the vertical direction of the hot water storage tank, and multiple display lamps are provided corresponding to each hot water temperature sensor. By turning on the display lamp corresponding to the hot water temperature sensor that detects a temperature exceeding the temperature, the amount of remaining hot water in the hot water storage tank can be displayed.

(Problems to be Solved by the Invention) The hot water storage tank as described above is configured as, for example, a large container capable of storing the amount of hot water used for one day, which causes a problem that the occupied space becomes large. Therefore, it is conceivable to thin the structure by arranging a plurality of hot water storage tanks having a small diameter in a line. However, in the case where a plurality of hot water storage tanks are provided in this way, in the case of an indicator consisting of display lamps corresponding to a plurality of hot water temperature sensors as described above, it is necessary to provide a plurality of indicators for each hot water storage tank. However, the total amount of remaining hot water cannot be displayed directly, and as a result, the comfort of use is impaired.

The present invention has been made in view of the above, and an object thereof is to display the total amount of remaining hot water with a simpler configuration, particularly in a configuration in which a plurality of hot water storage tanks are provided. It is to provide a hot water storage type hot water supply device.

(Means for Solving the Problems) Therefore, as shown in FIG. 1, the hot water storage type hot water supply apparatus according to the first aspect of the present invention comprises a first hot water storage tank 1 and a second hot water storage tank 2, and In the 1 hot water storage tank 1, the first sensor 1U is located in the middle part and the second sensor 1L is located below the first sensor 1U.
In addition, the second hot water storage tank 2 has a third sensor 2U and a fourth sensor 2L on the bottom side of the second hot water storage tank 2, and the high and low temperature signals with respect to the reference temperature are detected at the respective detection points. The hot water temperature detecting means 54 for outputting each of the detection points, and the output pattern of the high and low temperature signals corresponding to various remaining hot water states of the hot water exceeding the reference temperature are used as the total residual hot water amount in each of the hot water storage tanks 1 and 2. Correspondingly stored in advance storage means 53, and the residual hot water amount signal output means 52 for outputting the residual hot water amount signal by comparing the output pattern of the high and low temperature signals output from the hot water temperature detecting means 54 with the stored output pattern.
Further, in the storage means 53, when the detected hot water temperatures of the second sensor and the fourth sensor 1L, 2L both exceed the reference temperature, the residual hot water amount is large, and When the hot water temperatures detected by the third sensors 1U and 2U are both below the reference temperature, the residual hot water amount is zero or small, and the hot water temperature detected by the second sensor 1L exceeds the reference temperature and the fourth sensor
When the detected hot water temperature at 2L is below the reference temperature, the 4th sensor
When the detected hot water temperature in 2L exceeds the reference temperature and the detected hot water temperature in the second sensor 1L is equal to or lower than the reference temperature, and the above first and third
When the hot water temperature detected by the sensors 1U and 2U exceeds the reference temperature and the hot water temperatures detected by the second and fourth sensors 1L and 2L are below the reference temperature, the residual hot water amount is assumed to be an intermediate amount between the two residual hot water amounts. Therefore, it is characterized in that the relationship between the output pattern of each of the sensors 1U, 1L, 2U, 2L and the amount of remaining hot water is stored.

(Operation) In the hot water storage type hot water supply apparatus according to the first aspect, the output patterns of the high and low temperature signals from a plurality of detection points of the hot water storage tank are made to correspond to various remaining hot water states in the hot water storage tank, that is, the amount of remaining hot water. It is obtained in advance and stored in the storage means 53. Therefore, the remaining hot water amount can be directly obtained by determining which of the stored output patterns the output pattern of the high / low temperature signal output from the hot water temperature detecting means 54 matches. As a result, a plurality of hot water storage tanks 1 and 2
The total amount of remaining hot water in the unit can be grasped without requiring complicated procedures such as arithmetic processing, and the total amount of remaining hot water can be directly displayed on one display unit, which simplifies the configuration. It is possible to improve use comfort.

(Example) Next, a specific example of the hot water storage type hot water supply device of the present invention will be described in detail with reference to the drawings.

FIG. 2 shows the configuration of a hot water storage tank unit Y of a hot water storage type hot water supply apparatus according to an embodiment of the present invention. Inside the hot water storage tank unit Y, as shown in the figure, three cylindrical closed type Hot water storage tanks 1, 2, and 3 are arranged in parallel. A forward water pipe 5, a hot water supply heat exchanger 6, and a water return pipe 7 in which a circulation pump 4 is interposed are sequentially connected to a bottom portion of a first hot water storage tank (hereinafter referred to as a first tank) 1. A circulation path for hot water on the bottom side in the first tank 1 is configured.

The hot water supply heat exchanger 6 is composed of a double pipe with a leak detection that forms a refrigerant channel on the outside and a water channel on the inside, and gas side and liquid side refrigerant pipes are provided at both ends of the outside refrigerant channel. 8 and 9 are respectively connected. Although not shown, these refrigerant pipes 8 and 9 are further connected to a heat source side unit of a heat pump system having a compressor and a heat source side heat exchanger. The operation is performed by operating the compressor and circulating the refrigerant from the hot water supply heat exchanger 6 to the heat source side heat exchanger. At this time, the heat of refrigerant condensation in the hot water supply heat exchanger 6 is applied to the hot water flowing through the inner water flow path of the heat exchanger 6.

On the other hand, in the figure, 11 is a water supply pipe, and this water supply pipe 11 is connected to a first three-way valve 12, and one of the switching ports of this first three-way valve 12 is connected to the above-mentioned water supply pipe by a first water supply branch pipe 13. It is connected to a pipe portion between the circulation pump 4 and the first tank 1 in the forward pipe 5. And the first tank 11
When the hot water supply pipe 14 is connected to the upper part of the hot water supply pipe 14 and the mixing plug 15 at the end of the hot water supply pipe 14 is opened, the water supply pipe 11, the first three-way valve 12,
Due to the pressure of the tap water acting through the first water supply branch pipe 13 and the outward water pipe 5, the hot water on the upper side in the first tank 1 is pushed up through the hot water supply pipe 14 and at the same time the same amount as the hot water discharge amount. Is supplied to the bottom side of the first tank 1.

The other switching port of the first three-way valve 12 is connected to the bottom of a third hot water storage tank (hereinafter referred to as a third tank) 3 by a second water supply branch pipe 16. The upper part of the third tank 3 is connected to the second hot water storage tank (hereinafter referred to as the second hot water storage tank) by a connecting pipe 17.
It is connected to the bottom of a tank (referred to as a tank) 2, and the upper part of the second tank 2 is connected to the hot water supply pipe 14. Therefore, when the mixing stopper 15 is opened when the first three-way valve 12 is located at the switching position for communicating the water supply pipe 11 with the third tank 3, as shown by the one-dot chain line arrow in FIG. The pressure of tap water in the water supply pipe 11 is 3rd tank 3
Acts on the second tank 2 through the communication pipe 17, the hot water on the upper side of the second tank 2 is discharged, and the same amount of water as the remaining hot water is supplied to the bottom of the third tank 3 from the water supply pipe 11. To be done. As described above, the first three-way valve 12 has a switching function of selecting one of the first tank 1 side, the second tank 3 and the third tank 3 as the tapping tank.

Further, a replacement pipe 18 for transferring hot and cold water in the third tank 3 to the first tank 1 during the transfer operation described later is connected to the bottom of the third tank 3, and the tip of the replacement pipe 18 is It is connected to a second three-way valve 19 provided between the circulation pump 4 in the water outflow pipe 5 and the connection point of the first water supply branch pipe 13.

A hot water temperature sensor such as a thermistor is attached to the outer wall surface of each of the tanks 1, 2, and 3, and first, the first sensor 1U and the second sensor 1L are provided on the upper side and the lower side of the first tank 1, respectively.
However, a third sensor is provided on the top side and the bottom side of the second tank 2.
2U, the 4th sensor 2L, and the 5th sensor 3L are attached to the bottom side of the 3rd tank 3, respectively. These hot water temperature sensors are designed to detect the temperature of hot water at each water level corresponding to each mounting position, and based on these detected temperatures, control of the above-mentioned boiling water operation, hot water tank switching, and transfer operation However, the amount of remaining hot water, which will be described later, is displayed.

In FIG. 2, 21 is a drainage pipe connected to the bottom of each tank 1, 2 and 3, 22 and 22 are manual on-off valves provided in the drainage pipe 21, and 23 and 24 are water. A flow switch and a pressure switch provided in the upstream pipe 5, and 25 a pressure reducing valve provided in the water supply pipe 11, respectively. Further, reference numeral 26 is a midnight heater disposed in the first tank 1, and is configured to be capable of heating hot water using a combination of midnight electric power which is low in electric power cost.

Next, the control of the operation of the hot water storage type hot water supply apparatus having the above configuration will be described with reference to the operation control system diagram of FIG. The hot water tank unit Y is provided with a hot water supply control device 31, and the hot water supply control device 31 has the five hot water temperature sensors.
1U, 1L, 2U, 2L, 3L are connected, and also a remote control box 32 installed in a kitchen or the like is connected. As shown in FIG. 4, the remote control box 32 includes an operation switch 33, a hot water temperature setting switch 34, and the like. In the hot water supply operation control device 31, as shown in FIG.
A hot water / transfer operation control unit 35 and a hot water tank switching control unit 36 are provided. First, on the assumption that the operation switch 33 is ON, the hot water / transfer operation control unit 35 controls the hot water and The transfer operation will be described.

This boiling water operation is performed when the temperature detected by the second sensor 1L does not reach the hot water temperature set by the hot water temperature setting switch 34.
The second three-way valve 19 is provided on the suction side of the circulation pump 4 for the first tank 1
Is located at a switching position where the bottom part of the hot water supply unit communicates, the hot water supply heating operation command signal is output to the heat source side unit X, the refrigerant from the compressor is circulated through the hot water supply heat exchanger 6, and the circulation pump 4 is operated. By doing. As a result, the hot water on the bottom side in the first tank 1 circulates through the hot water supply heat exchanger 6, and at this time, as described above, is heated by the heat of condensation of the refrigerant. This heated hot water is sequentially replaced by convection with the low temperature hot water on the upper side in the first tank 1, and therefore, by continuing the boiling operation, the first tank 1 is gradually replaced with high temperature hot water from the upper side. Will be taken.

When the above boiling water operation is continued and the temperature detected by the second sensor 1L reaches the set hot water temperature, and thus the boiling of the hot water in the first tank 1 is finished, at this point, the fifth sensor 3L
The detected temperature in 1 is compared with the transfer start temperature set at a temperature lower than the set hot water temperature. If the temperature is higher than this temperature, it is considered that high-temperature hot water close to the set hot water temperature is stored in the entire second and third tanks 2 and 3, and the boiling operation is stopped. On the other hand, when the temperature detected by the fifth sensor 3L is lower than the transfer start temperature, the transfer operation is continuously switched.

From the above, this transfer operation is performed by switching the second three-way valve 19 to the switching position where the suction side of the circulation pump 4 communicates with the bottom of the third tank 3 through the replacement pipe 18. As a result, as shown by the solid line arrow in FIG. 2, the low temperature hot water on the bottom side of the third tank 3 is sucked by the circulation pump 4 and flows into the bottom of the first tank 1 through the hot water supply heat exchanger 6.
At the same time, the same amount of hot water as the inflow amount from the first tank 1 to the bottom is pushed out from the upper part, which is connected to the upper part of the second tank 2 and the hot water at the bottom of the second tank 2 is connected to the connecting pipe 17
Through the above, an extruding movement is sequentially performed to the upper portion of the third tank 3, whereby the hot water is transferred, and the replacement is performed as a whole.

This transfer operation is performed when the temperature detected by the fifth sensor 3L becomes a high temperature state that exceeds the transfer end temperature near the set hot water temperature, or when the temperature detected by the first sensor 1U becomes lower than the set hot water temperature. When the hot water that has been boiled first in the first tank 1 is transferred to the second and third tanks 2 and 3, the second three-way valve 19 is switched again and the first transfer is performed by the above transfer operation. The boiling operation for the low-temperature hot water that has flowed into the first tank 1 from the 3rd tank 3 side is subsequently performed.

After that, at the stage where the boiling water operation in the first tank 1 is completed, the boiling operation is completed until the high temperature hot water is already stored in the entire second and third tanks 2 and 3. The operation of transferring the boiling water to the second and third tanks 2 and 3 is performed every time, and the operation is stopped when the whole is in a state of storing hot water. After that, each time the temperature detected by the second sensor 1L newly becomes lower than the set temperature, the above boiling operation and further transfer operation are performed.

Next, the hot water tank switching control by the hot water tank switching control unit 36 will be described. This compares the temperature detected by the first sensor 1U with the hot water discharge reference temperature, and when it is higher than this hot water discharge reference temperature, controls the first three-way valve 12 so that the first tank 1 side serves as the hot water discharge tank. . On the other hand, when the temperature is lower than the hot water reference temperature, that is, when hot water having a sufficiently high temperature is not stored in the first tank 1, the temperature detected by the third sensor 2U is subsequently compared with the hot water reference temperature, After confirming that the hot water discharge reference temperature is exceeded, the hot water discharge tank is switched to the second and third tanks 2 and 3 by the first three-way valve 12. That is, the first tank 1 side is preferentially selected as the hot water discharge tank, and only when the hot water cannot be discharged from the first tank 1 side, control is performed to switch to the second and third tanks 2 and 3 side. . In this case, the second,
If there is no high-temperature hot water on the third tanks 2 and 3 side, the first tank 1 is selected as the hot water discharge tank, and hot water is discharged from the first tank 1 while performing the boiling water operation.

As described above, on the basis of the temperature detected by each hot water temperature sensor 1U, 1L, 2U, 2L, 3L, hot water boiling operation, transfer operation, switching of the hot water tank is performed by the hot water supply control device 31, but further the above each detection Based on the temperature, the display unit 37 provided in the remote control box 32 shown in FIG. 4 is also adapted to display the amount of remaining hot water. This control will be described below. In this case, it is assumed that each of the tanks 1, 2 and 3 has an internal capacity of 100 liters, and the first sensor 1U and the third sensor 2U have a volume of 50 liters from the upper side of each of the first tank 1 and the second tank 2. It is assumed that they are installed at positions that can detect the hot water temperature depending on the water level, and that the second sensor 1L, the fourth sensor 2L, and the fifth sensor 3L are used when their detected temperatures exceed the reference temperature. The description will be made assuming that the total amount (100 l) in each tank is attached to the bottom position where it can be regarded as hot water exceeding the reference temperature.

First, the structure of the display unit 37 will be described with reference to FIG.

The display unit 37 is an LCD (Liquid Crystal) such as a liquid crystal.
5) shows a clear-view pattern in a fully energized state of a change region (hereinafter referred to as a clear-view pattern) which is visually changed by energization. As shown in the figure, the display unit 37 has four display portions 41 to 44 each having a rectangular peripheral edge (however, the upper side of the uppermost display portion 41 has an arc shape).
When the four display parts 41-44 are all visible as shown in the figure, the total amount (300l) in the hot water storage tank is visible, and the three lower display parts 42-44 are visible. 200l in the case of the state, 100l in the case where the lower two display sections 43 and 44 are in the visible state, and 50 in the case of the lowermost display section 44 in the visible state.
It is designed to show that each l is hot water exceeding the reference temperature.

Note that each of the display units 41 to 44 is also configured to perform a two-stage display according to the hot water temperature.
˜44 is a first linearly distinct pattern 45, ... which is inclined from the upper side to the left and extends downwardly.
Between the display area 46 and each of the first distinct vision patterns 45, ...
A plurality of second distinct vision patterns 47 wider than the distinct vision patterns 45
.. and the second display area 48 having 47. As a result, the state of remaining hot water near the set hot water temperature exceeding the first reference temperature is displayed by the second clear vision pattern 47, and the state of residual hot water exceeding the second reference temperature of about 47 ° C. is displayed by the first clear vision pattern. By displaying at 45, for example, in the display shown in FIG. 6, there are two stages of hot water temperature, such as 100 liters of hot water above the first reference temperature and 200 liters of hot water above the second reference temperature. The amount of remaining hot water based on is displayed at the same time.

In order to generate a display signal for the display unit 37 as described above based on the respective detected temperatures of the hot water temperature sensors 1U, 1L, 2U, 2L, 3L, the hot water supply control device 31 is shown in FIG. As described above, a temperature signal comparison unit 51, a remaining hot water amount determination unit (remaining hot water amount signal output means) 52, and a storage unit (storage means) 53 are further provided. The temperature detected by each hot water temperature sensor is first compared with a reference temperature in the temperature signal comparison unit 51, and the high and low temperature signals for this reference temperature are determined from the temperature comparison unit 51 for each hot water temperature sensor. It is output to the unit 52. Therefore, in this embodiment, each hot water temperature sensor 1
U, 1L, 2U, 2L, 3L and the temperature comparison unit 51, hot water temperature detection means for outputting the temperature state of hot water at a plurality of locations in the hot water storage tank as a binary signal of the high and low temperature signals with respect to the reference temperature Although 54 is configured, it is also possible to adopt another configuration that directly outputs high and low temperature signals such as a thermostat.

On the other hand, the storage unit 53 stores in advance the output patterns of the high and low temperature signals corresponding to various remaining hot water states of hot water exceeding the reference temperature, the contents of which will be described below.

Table 1 on the next page shows the hot water temperature sensors 1U, 1L, 2U, 2L,
The various output patterns of the high and low temperature signals from 3L are shown.

As mentioned above, the first tank 1 and the second and third tanks 2,
When hot and cold water having a high and low temperature difference is stored in 3, the hot water and hot water are separated on the downstream side and the low temperature hot water on the upstream side, respectively.
When the high / low temperature signal from the fifth sensor 3L at the most upstream position in the hot water discharge path direction on the tanks 2 and 3 is the high temperature side "H", the third and fourth sensors 2U on the downstream side of this, When there is no residual hot water condition where the low temperature temperature signal "L" is output at 2L and the signal "L" is output, the 4th and 5th sensors 2L and 3L on the upstream side of this There is no residual hot water condition where the high temperature side signal “H” is output. Since the same applies to the first and second sensors 1U and 1L in the first tank 1, each of the hot water temperature sensors 1U, 1L, 2U, 2L and 3L outputs 12 types of high and low temperature signals shown in Table 1. Output pattern exists. Each output pattern corresponds to a different residual hot water state in each of the tanks 1, 2 and 3, and further, as described in the column of hot water amount in the table, the correspondence between the output pattern and the residual hot water amount. Relationship is required.

For example, in the residual hot water state, since the high and low temperature signals from the second sensor 1L and the fifth sensor 3L are both on the high temperature side "H", the total amount in the first tank 1 and the second and third tanks 2, 3 Indicates a state of residual hot water that is high-temperature hot water exceeding the reference temperature, and in this case, the amount of residual hot water is 300 l. Also, for example, the state of remaining hot water is "H" with the first sensor 1U and "L" with the second sensor 1L, so there is 50 l of hot water on the upper side of the first tank 1 and "H" with the fourth sensor 2L. "There is all the hot water in the second tank 2 and the fifth sensor 3L is" L ", which means that only a part of the third hot water storage tank 3 has residual hot water. . Therefore, in this case, at least 150 l of hot water is secured.

On the other hand, as described above, in the display unit 37, 0, 50, 10
Since 0, 200, and 300 liters are displayed in 5 levels, as described in the column for the amount of hot water to be displayed in the same table, 20
It is displayed as 0l, and when the amount of remaining hot water is 150l, it is displayed as 100l. And hot water temperature sensors 1U, 1L, 2
The output patterns of high and low temperature signals from U, 2L and 3L are shown in the above 5
Table 2 shows the determination conditions associated with the amount of remaining hot water at each stage, and the contents are stored in the storage unit 53 described above.

For example, the second sensor 1L and the fifth sensor 3L in discrimination No.i
It is determined that the output pattern in the case where the high and low temperature signals from are both “H” satisfy the determination condition is the residual hot water state in Table 1 regardless of the signal contents from other sensors. The amount of remaining hot water becomes 300l, and again, for example, the second
The output pattern when the determination conditions of the second sensor 1L in the discrimination No. ii of the table are “L” and the fifth sensor 3L is “H” are either the state of remaining hot water in Table 1 or Is determined, and in this case the amount of remaining hot water is 200 l.

Therefore, in the remaining hot water amount determination unit 52, the pattern of the high and low temperature signal for each hot water temperature sensor input at a predetermined sampling time from the temperature comparison unit 51, the determination No. i stored in the storage unit 53. It is determined which of the determination conditions from ~ viii is satisfied, and the remaining hot water amount signal corresponding to the satisfied condition is output to the display unit 37. In the temperature comparison unit 51, a temperature (Ds-β) slightly lower than the set hot water temperature Ds is set as a first reference temperature, and 47 ° C is set as a second reference temperature, for example. The first reference temperature and the second reference temperature are alternately compared and a high / low temperature signal is output. As a result, the remaining hot water amount determination unit 52 outputs the first reference temperature and the second reference temperature. The respective residual hot water amount signals exceeding the respective two reference temperatures are alternately output to the display unit 37.

As an example, when there is hot water in the first tank 1 at an intermediate temperature of about 50 ° C during operation, high temperature hot water near the set hot water temperature in the second tank 2, and water in the third tank 3 As an example, first, from the temperature comparison unit 51, as a result of the comparison with the first reference temperature, the third and fourth sensors 2U, 2L.
High and low temperature signals that are “H” at, and “L” at others are generated,
Since this output pattern satisfies the determination No. vi in Table 2, the residual hot water amount signal that sets the residual hot water amount near the set temperature to 100 l is output to the display unit 37. Subsequently, the temperature comparison unit 51 performs comparison with the second reference temperature, and as a result, the first and second sensors 1U and 1L and the third and fourth sensors are compared.
High and low temperature signals of "H" with 2U and 2L and "L" with the fifth sensor 3L are generated, and this output pattern satisfies the discrimination No. iii in Table 2, so the residual hot water amount of the intermediate hot water is The remaining hot water amount signal with 200 l is output to the display unit 37. As a result, the display unit 37 shows the display state shown in FIG.
After that, the above-mentioned processing is repeated every predetermined sampling time, and the display unit 37 displays a display according to the change in the amount of remaining hot water due to the continuation of the boiling water operation or the use of hot water.

As described above, in the above embodiment, since a signal that directly indicates the total amount of remaining hot water in the plurality of hot water storage tanks is output, the configuration for displaying the total amount of remaining hot water becomes simple and The user's comfort is improved. In the above description, a device using a heat pump system as a heating source is described as an example, but the present invention can also be applied to a hot water storage type hot water supply device having other heating sources such as an electric heater. Further, the present invention can be applied to a configuration of a plurality of hot water storage tanks other than the above embodiment.

(Effect of the Invention) As described above, in the hot water storage type hot water supply apparatus according to the first aspect of the present invention, since the residual hot water amount in the hot water storage tank is directly obtained, the total residual hot water amount in the plurality of hot water storage tanks is Since the total amount of remaining hot water can be directly displayed on one display without needing a complicated procedure such as arithmetic processing, the structure is simplified and the comfort of use is improved.

[Brief description of drawings]

FIG. 1 is a functional block diagram of the present invention, FIG. 2 is a schematic diagram of a hot water storage tank unit of a hot water storage type hot water supply device in one embodiment of the present invention, and FIG. 3 is an operation control system diagram of the hot water storage type hot water supply device, FIG. 4 is a schematic front view of a remote control box in the above apparatus, FIG. 5 is an enlarged view of a display unit in the remote control box, and FIG. 6 is a diagram showing an example of display on the display unit. 1 ... 1st hot water storage tank, 2 ... 2nd hot water storage tank, 3 ...
Third hot water storage tank, 52 ... Remaining hot water amount determination unit (remaining hot water amount signal output means), 53 ... Storage unit (storage means), 54 ... Hot water temperature detection means.

Claims (1)

[Scope of utility model registration request] 1. A first hot water storage tank (1) and a second hot water storage tank (2), wherein the first hot water storage tank (1) has a first sensor (1U) at a middle portion and a bottom side thereof. The second sensor (1L), the second hot water storage tank (2) has a third sensor (2U) in the middle portion and a fourth sensor (2L) on the bottom side of the second sensor (2L), and The hot water temperature detection means (54) that outputs a high and low temperature signal for the reference temperature at each of the detection points at each of the detection points, and the output pattern of the high and low temperature signals that correspond to various remaining hot water states of the hot water that exceed the reference temperature. , Each hot water storage tank (1) (2)
The storage means (5 that stores in advance corresponding to the total amount of remaining hot water in the
3) and a residual hot water amount signal output means (5) for comparing the output pattern of the high and low temperature signals output from the hot water temperature detecting means (54) with the stored output pattern and outputting a residual hot water amount signal.
2) is provided, and in the storage means (53), when the hot water temperatures detected by the second sensor and the fourth sensor (1L) (2L) both exceed the reference temperature, the amount of remaining hot water is large. If the hot water temperatures detected by the first and third sensors (1U) and (2U) are both below the reference temperature, the residual hot water amount is zero or small, and the hot water detected by the second sensor (1L) is When the temperature exceeds the reference temperature and the hot water temperature detected by the 4th sensor (2L) is below the reference temperature, the hot water temperature detected by the 4th sensor (2L) exceeds the reference temperature and the hot water temperature is detected by the 2nd sensor (1L) When the hot water temperature is below the reference temperature, and the first and third sensors (1U)
When the detected hot water temperature in (2U) exceeds the reference temperature and the detected hot water temperatures in the second and fourth sensors (1L) and (2L) are lower than the reference temperature, the remaining hot water amount is an intermediate amount between the two remaining hot water amounts. Therefore, the hot water storage type hot water supply device is characterized in that the relationship between the output pattern of each of the sensors (1U) (1L) (2U) (2L) and the amount of remaining hot water is stored.