JP2018040524A - Hot water storage type hot water supply apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water storage type hot water supply apparatus which suppresses a user from being made discomfort and can evacuate air in a hot water storage tank.SOLUTION: A hot water storage type hot water supply apparatus supplies water in a hot water storage tank to a water faucet. Even at a timing of an air vent operation for evacuating air in the hot water storage tank, the hot water supply apparatus restricts the air vent operation according to that water was discharged from the water faucet.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a hot water storage type water heater.

  2. Description of the Related Art Conventionally, a hot water heater that stores hot water in a sealed hot water storage tank and discharges hot water from the hot water storage tank is known. In this hot water storage type water heater, when the hot water in the hot water storage tank is boiled, the solubility of the hot water gas decreases as the temperature of the hot water rises. Therefore, the gas dissolved in the hot water (hereinafter referred to as “air”) can no longer be dissolved and accumulates in the upper part of the hot water storage tank. If you open the faucet provided at the end of the hot water supply pipe while air is accumulated in the upper part of the hot water storage tank, air and hot water are supplied to the faucet together, and the water discharged from the faucet is disturbed. There's a problem.

  In order to solve this problem, a discharge pipe is installed in the upper part of the hot water storage tank, and the water accumulated in the hot water storage tank is discharged to the outside by periodically draining through the discharge pipe (hereinafter referred to as “air bleeding operation”). A hot water heater has been proposed (for example, see Patent Document 1).

Japanese Patent No. 4688054

  However, in the conventional hot water storage type hot water heater, since it is necessary to periodically perform the air bleeding operation, the air bleeding operation is performed even when the user uses the faucet. Therefore, when the water supply pressure is low, pulsation occurs in the water discharged from the faucet, which may cause discomfort to the user.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a hot water storage water heater capable of suppressing discomfort to the user and discharging the air in the hot water storage tank. It is to be.

  One aspect of the present invention is a hot water storage type water heater that supplies water in a hot water storage tank to a water faucet, and even from the timing of the air venting operation for discharging the air in the hot water storage tank, The hot water storage type hot water heater is characterized in that the air bleeding operation is regulated in response to water discharge.

  One aspect of the present invention is the above-described hot water storage type water heater, further comprising a drain pipe connected to the hot water storage tank, and in the air bleeding operation, the same water tank as the water tank that the faucet discharges water, The water in the hot water storage tank is drained through the drain pipe.

  One aspect of the present invention is the above-described hot water storage type water heater, further comprising a flow rate detection unit that detects a flow rate of water flowing into the hot water storage tank, based on the flow rate detected by the flow rate detection unit, It is determined whether water is discharged from the faucet, and the air bleeding operation is restricted when it is determined that the water is discharged.

  As described above, according to the present invention, it is possible to suppress discomfort to the user and to discharge the air in the hot water storage tank.

It is a perspective view of hot water storage type water heater 11 concerning this embodiment. It is a figure which shows an example of a structure of the hot water storage type water heater 11 which concerns on this embodiment. It is a figure which shows an example of schematic structure of the control apparatus 10 in this embodiment. It is a figure which shows the flow of a process of the control apparatus 10 in this embodiment.

  Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. In addition, not all the combinations of features described in the embodiments are essential for the solving means of the invention. In the drawings, the same or similar parts may be denoted by the same reference numerals and redundant description may be omitted.

  Hereinafter, the hot water storage type water heater of an embodiment is explained using a drawing.

  FIG. 1 is a perspective view of a hot water storage water heater 11 according to this embodiment. The hot water storage water heater 11 according to the present embodiment is used by being fixed to a wall surface above the sink 100. The hot water storage type water heater 11 is connected to a mixing faucet 33 and a drain outlet 200 provided on the sink 100 via a pipe in the wall. The mixing faucet 33 and the drainage port 200 are installed side by side on the upper wall surface of the sink 100, and are configured such that water is discharged into the same sink 100, which is one water tank. FIG. 2 is a diagram illustrating an example of the configuration of the hot water storage water heater 11 according to the present embodiment.

  The hot water storage water heater 11 includes a hot water storage tank 61 with a heater, which will be described later, in a casing 12. The hot water storage water heater 11 includes an operation panel 16. The operation panel 16 includes a display unit 17 and a plurality of operation units 18. The operation unit 18 includes a power switch.

  For example, the hot water heater 11 is connected to a power outlet (not shown) provided on a wall, and the power switch provided on the front surface of the casing 12 is operated to be opened to operate the power supply. A power supply voltage is supplied via the power cable 52. And the hot water storage type water heater 11 uses this power supply voltage as a drive voltage.

This power switch supplies a power supply voltage to each part of the hot water storage water heater 11 when operated by the user in an open state. On the other hand, the power switch shuts off the supply of the power supply voltage to each part of the hot water heater 11 when operated by the user in the closed state.
The operation unit 18 is operated by the user when various parameters are set for the hot water heater 11 or when hot water stored in the hot water heater 11 is replaced. It is. The display unit 17 may be configured to have the function of the operation unit 18. That is, the display unit 17 may display various information related to the hot water storage hot water heater 11 and may detect a user operation on the displayed information, for example, a touch panel.

The display unit 17 is provided in the vicinity of the power switch.
The display unit 17 is a liquid crystal display, an organic EL (Electro Luminescence) display, or the like. The display unit 17 displays various information related to the hot water storage water heater 11.
For example, the display unit 17 and the power switch are arranged in the same operation panel 16. The display unit 17 is disposed at a position where the user can visually recognize the power switch when the user operates the power switch.

Next, the structure of the hot water storage type water heater 11 according to the present embodiment will be described.
As shown in FIG. 2, the hot water heater 11 includes a hot water storage tank 61, check valves 65 and 67, a filter 64, a pressure reducing valve 66, a solenoid valve 70, a relief valve 72, a thermistor 73, in the casings 12 and 13. 75, 77, a flow sensor 76 (flow rate detector), and a control device 10 are provided.

  The water supplied from the water supply pipe 39 is removed from the water by the filter 64 and flows through the check valve 65. The water flowing through the check valve 65 is depressurized by the pressure reducing valve 66, then flows through the water supply pipe 39 and is supplied into the hot water storage tank 61. At this time, the thermistor 75 detects the temperature of the water supply. The flow sensor 76 detects the flow rate of the water supply.

The hot water storage tank 61 includes a heater 71 inside. The heater 71 boils the water in the hot water storage tank 61 into, for example, hot water of 60 to 90 ° C. based on the control of the control device 10. The hot water storage tank 61 includes a thermistor 77 inside. The temperature of the hot water in the hot water storage tank 61 is detected by the thermistor 77. Then, a detection signal indicating the detection result is output to the control device 10.
The hot water boiled in the hot water storage tank 61 is supplied to the hot water faucet 32 through the hot water pipe 36 and flows out of the hot water faucet 32 so as to be used as drinking hot water.

Further, a part of the hot water boiled in the hot water storage tank 61 is diverted from the hot water pipe 36 to the hot water branch pipe 81 and supplied to the mixed water tap 33.
On the other hand, a part of the water supply from the water supply pipe 39 is diverted to the water supply branch pipe 82 branched from the water supply pipe 39. Then, the water supplied to the water supply branch pipe 82 is supplied to the mixed water tap 33. As a result, the hot water generated by mixing the hot water supplied through the hot water branch pipe 81 and the water supplied through the water supply branch pipe 82 flows out of the mixing faucet 33, so that the tableware It is used as a hot water supply for miscellaneous purposes for performing cleaning and the like. In the following description, the hot water faucet 32 and the mixing faucet 33 may be referred to as a faucet unless particularly distinguished from each other.
For example, the mixing tap 33 is provided above the sink 100.

  In addition, when boiling water in the hot water storage tank 61, expanded water is generated due to an increase in pressure in the hot water storage tank 61. When the internal pressure exceeds a predetermined pressure, the relief valve 72 is opened, and the generated expansion water is discharged from the drain outlet 200 through the expansion water discharge pipe 83. The expanded water discharge pipe 83 extends to the drain port 200 below the hot water storage tank 61. Below the hot water storage tank 61 is a position lower than the bottom surface of the hot water storage tank 61. In addition to the region directly below the hot water storage tank 61, as shown in FIG. 1, the tank 3 in the casings 12 and 13 of the hot water storage hot water heater Lower positions are also included.

In addition, when hot water is boiled in the hot water storage tank 61, the solubility of the hot water gas decreases as the temperature of the hot water rises. Therefore, the gas dissolved in the hot water (hereinafter referred to as “air”) can no longer be dissolved and accumulates in the upper part of the hot water storage tank 61.
Therefore, the air is discharged from the drain pipe 41 simultaneously with the hot water in the hot water storage tank 61 by controlling the electromagnetic valve 70 to be open in order to exhaust the air in the hot water storage tank 61. That is, when the solenoid valve 70 is controlled to be in the open state, the air accumulated in the upper part of the hot water storage tank 61 is discharged from the drain pipe 41 simultaneously with the hot water.

  A water supply branch pipe 92 is branched from the water supply pipe 39, and a part of the water supply is diverted to the water supply branch pipe 92 from the water supply pipe 39. The drain pipe 41 and the water supply branch pipe 92 merge at the mixing unit 69.

  The mixing unit 69 is a flow path junction between the drain pipe 41 and the feed water branch pipe 92. Therefore, in the mixing part 69, the air and hot water which have distribute | circulated the drain pipe 41, and the water which has distribute | circulated the feed water branch pipe 92 mix. This mixed water is discharged to the drain outlet 200 through the electromagnetic valve 70 provided on the outflow side of the mixing unit 69. Thereby, the air in the hot water storage tank 61 is also discharged to the outside through the drain pipe 41 and the drain port 200. Hereinafter, the operation of discharging the air in the hot water storage tank 61 to the outside is referred to as an air bleeding operation.

  A check valve 67 is provided on the hot water inflow side (drain pipe 41 side) of the mixing unit 69 in order to prevent the mixed water from flowing back.

  The thermistor 73 is provided on the downstream side of the electromagnetic valve 70. The thermistor 73 is for detecting an abnormal temperature, and detects an abnormally high temperature of the drainage that occurs when the check valve 67 is fixed. When an abnormally high temperature is detected by the thermistor 73, the solenoid valve 70 is closed to ensure safety.

Controller 10, the temperature of the hot water in the hot water storage tank 61 in which the thermistor 77 is detected, if it becomes less than the first temperature T _ON, by outputting a control signal to the heater 71, in the hot water storage tank 61 Water is boiled in hot water at a second temperature T _OFF (> T _ON ).

The control device 10 performs an air bleeding operation for discharging the air in the hot water storage tank by controlling the electromagnetic valve 70 to an open state at a predetermined timing (hereinafter referred to as “air bleeding operation timing”). The air venting operation timing is, for example, when the temperature of the hot water in the hot water storage tank 61 becomes _lower than the first temperature TON or when the temperature of the hot water in the hot water storage tank 61 exceeds the second temperature T _OFF . In this case, the preset temperature of the hot water in the hot water storage tank 61 is the third temperature T _AIR (T _ON <T _AIR <T _OFF ). The third temperature T _AIR may be set to one temperature or a plurality of temperatures. However, the control device 10 regulates the air bleeding operation according to the fact that water is discharged from the faucet even at the timing of the air bleeding operation. For example, the control device 10 holds the electromagnetic valve 70 in the closed state and does not perform the air bleeding operation when the water is discharged from the faucet even at the air bleeding operation timing. And when the water discharge from a water tap is not performed, the control apparatus 10 will open the solenoid valve 70 and will perform air bleeding operation if it is air bleeding operation timing. Thereby, it is possible to prevent the user from feeling uncomfortable without causing pulsation in the water discharged from the faucet. Below, the structure of the control apparatus 10 is demonstrated concretely.

FIG. 3 is a diagram illustrating an example of a schematic configuration of the control device 10 according to the present embodiment.
As shown in FIG. 3, the control device 10 includes a temperature determination unit 20, a control unit 24, an electromagnetic valve driving unit 25, and a heater driving unit 26.

The temperature determination unit 20 includes a boiling start temperature determination unit 21, a boiling stop temperature determination unit 22, and an air bleeding temperature determination unit 23.
The boiling start temperature determination unit 21 determines whether or not to boil the hot water in the hot water storage tank 61 based on the hot water temperature T in the hot water storage tank 61. For example, the start temperature determination unit 21 boiling, the temperature T of the hot water in the hot water storage tank 61 detected by the thermistor 77, determines whether or not less than the first temperature T _ON. Start temperature determination unit 21 boiling, the temperature T of the hot water in the hot water storage tank 61 detected by the thermistor 77, if it is less than the first temperature T _ON, it is determined that carrying out the boiling hot water, the A boiling start signal indicating the determination result is output to the control unit 24.

The boiling stop temperature determination unit 22 determines whether or not to stop the boiling of the hot water in the hot water storage tank 61 based on the temperature T of the hot water in the hot water storage tank 61. For example, the boiling stop temperature determination unit 22 determines whether or not the temperature T of hot water in the hot water storage tank 61 detected by the thermistor 77 has exceeded the second temperature T _OFF . When the temperature T of hot water in the hot water storage tank 61 detected by the thermistor 77 exceeds the second temperature T _OFF , the boiling stop temperature determination unit 22 stops boiling of the hot water in the hot water storage tank 61. Then, it determines, and the boiling stop signal which shows the determination result is output to the control part 24.

The air bleeding temperature determination unit 23 determines whether or not to perform the air bleeding operation based on the temperature T of the hot water in the hot water storage tank 61. For example, air vent temperature determination unit 23 determines whether or not the temperature T of the hot water in the hot water storage tank 61 detected by the thermistor 77 has exceeded the third temperature T _AIR. When the temperature T of the hot water in the hot water storage tank 61 detected by the thermistor 77 exceeds the third temperature T _AIR , the air bleeding temperature determination unit 23 determines that the air bleeding operation is performed, and the determination result Is output to the control unit 24.
The above-described boiling stop signal, boiling start signal, and air bleeding operation signal are all signals indicating that an air bleeding operation is necessary. That is, the boiling stop signal, the boiling start signal, and the air bleeding operation signal are signals indicating the air bleeding operation timing.

  When any one of the boiling stop signal, the boiling start signal, and the air bleeding operation signal is output from the temperature determination unit 20, the control unit 24 sends a first drive signal to the electromagnetic valve drive unit 25 for a predetermined time. Is output during this period, the electromagnetic valve 70 is opened. Thereby, the control part 24 implements the air bleeding operation in the hot water storage tank 61 during a predetermined time. This predetermined time is, for example, 1 second.

  However, in the case where any one of the boiling stop signal, the boiling start signal, and the air bleeding operation signal is output from the temperature determination unit 20, the control unit 24 is configured to discharge water from the faucet. Does not output the first drive signal to the solenoid valve drive unit 25 and does not perform the air bleeding operation. Here, when the hot water in the hot water storage tank 61 is used by the user, an amount of new water corresponding to the used hot water flows into the hot water storage tank 61. That is, when hot water in the hot water storage tank 61 is discharged from the faucet, an amount of water corresponding to the discharged hot water flows into the hot water storage tank 61. Therefore, when the detection signal is output from the flow sensor 76, the control unit 24 determines that water is discharged from the faucet.

  When the boiling start signal is output from the temperature determination unit 20, the control unit 24 outputs the second control signal to the heater driving unit 26, thereby driving the heater 71, and the hot water in the hot water storage tank 61. Start boiling. When the heater 71 is driven and the temperature determination unit 20 outputs a boiling stop signal, the control unit 24 stops outputting the second control signal to the heater driving unit 26. Thereby, the drive of the heater 71 is stopped and the boiling of the hot water in the hot water storage tank 61 is stopped. However, when performing the air bleeding operation, the control unit 24 controls the driving of the heater 71 after the air bleeding operation. That is, the control unit 24 starts boiling water in the hot water storage tank 61 after the air bleeding operation when a boiling start signal is output from the temperature determination unit 20 and water is not discharged from the faucet. Let Moreover, the control part 24 stops the boiling of the hot water in the hot water storage tank 61 after air bleeding operation, when the boiling stop signal is output from the temperature determination part 20 and the water discharge from the faucet is not performed. Let

  When the first drive signal is output from the control unit 24, the electromagnetic valve drive unit 25 controls the electromagnetic valve 70 to be in an open state. When the first drive signal is not output from the control unit 24, the solenoid valve drive unit 25 controls the solenoid valve 70 to be closed.

  When the second drive signal is output from the control unit 24, the heater driving unit 26 drives the heater 71 to boil hot water in the hot water storage tank 61. On the other hand, the heater drive unit 26 does not drive the heater 71 when the second drive signal is not output from the control unit 24.

Below, the flow of the process of the control apparatus 10 in this embodiment is demonstrated using FIG. FIG. 4 is a diagram illustrating a processing flow of the control device 10 according to the present embodiment.
Start temperature determination unit 21 boiling, the temperature T of the hot water in the hot water storage tank 61 detected by the thermistor 77, determines whether or not less than the first temperature T _ON (step S101). Start temperature determination unit 21 boiling, the temperature T of the hot water in the hot water storage tank 61 detected by the thermistor 77, if it is less than the first temperature T _ON, it is determined that carrying out the boiling hot water, boiling The upper start signal is output to the control unit 24. On the other hand, the start temperature determination unit 21 boiling, the temperature T of the hot water in the hot water storage tank 61 detected by the thermistor 77, the case where the first temperature T _ON or higher, not to implement the boiling hot water determination The boiling start signal is not output to the control unit 24.

  When the boiling start temperature determination unit 21 outputs a boiling start signal, the control unit 24 determines whether a detection signal is output from the flow sensor 76 (step S102). When the detection signal is output from the flow sensor 76, the control unit 24 controls the electromagnetic valve 70 in the closed state, and outputs a second drive signal to the heater drive unit 26 (step S103). On the other hand, when the detection signal is not output from the flow sensor 76, the control unit 24 outputs the first drive signal to the electromagnetic valve driving unit 25, thereby controlling the electromagnetic valve 70 in the open state for 1 second, for example. (Step S104). Thereby, the control unit 24 performs an air bleeding operation in the hot water storage tank 61. Then, the control unit 24 outputs a second drive signal to the heater drive unit 26 after the air bleeding operation in the hot water storage tank 61.

When the second drive signal is output from the control unit 24, the heater drive unit 26 drives the heater 71 to start boiling water in the hot water storage tank 61 (step S105).
The boiling stop temperature determination unit 22 determines whether or not the temperature T of the hot water in the hot water storage tank 61 detected by the thermistor 77 has exceeded the second temperature T _OFF (step S106). The boiling stop temperature determination unit 22 outputs a boiling stop signal to the control unit 24 when the temperature T of the hot water in the hot water storage tank 61 detected by the thermistor 77 exceeds the second temperature T _OFF. . On the other hand, when the hot water temperature T in the hot water storage tank 61 detected by the thermistor 77 is equal to or lower than the second temperature T _OFF , the boiling stop temperature determination unit 22 sends a boiling stop signal to the control unit 24. Do not output. Then, when the temperature T of the hot water in the hot water storage tank 61 is equal to or lower than the second temperature T _OFF , the air vent temperature determination unit 23 determines whether the temperature T of the hot water has exceeded the third temperature T _AIR . Is determined (step S107).

The air bleeding temperature determination unit 23 outputs an air bleeding operation signal to the control unit 24 when the temperature T of the hot water in the hot water storage tank 61 exceeds the third temperature T _AIR . On the other hand, when the temperature T of the hot water in the hot water storage tank 61 is lower than the third temperature T _AIR , the air bleeding temperature determination unit 23 does not output the air bleeding operation signal to the control unit 24, and in step S106 Transition to processing.

  When the air bleeding operation signal is output from the air bleeding temperature determination unit 23, the control unit 24 determines whether or not a detection signal is output from the flow sensor 76 (step S108). When the detection signal is output from the flow sensor 76, the control unit 24 controls the electromagnetic valve 70 in the closed state (step S109). On the other hand, when the detection signal is not output from the flow sensor 76, the control unit 24 outputs the first drive signal to the electromagnetic valve driving unit 25, thereby controlling the electromagnetic valve 70 in the open state for 1 second, for example. (Step S110).

The boiling stop temperature determination unit 22 determines whether or not the temperature T of the hot water in the hot water storage tank 61 detected by the thermistor 77 has exceeded the second temperature T _OFF (step S111). The boiling stop temperature determination unit 22 outputs a boiling stop signal to the control unit 24 when the temperature T of the hot water in the hot water storage tank 61 detected by the thermistor 77 exceeds the second temperature T _OFF. . On the other hand, when the hot water temperature T in the hot water storage tank 61 detected by the thermistor 77 is equal to or lower than the second temperature T _OFF , the boiling stop temperature determination unit 22 sends a boiling stop signal to the control unit 24. Without outputting, the process of step S111 is performed again.

  When the boiling stop signal is output from the boiling stop temperature determination unit 22, the control unit 24 determines whether or not a detection signal is output from the flow sensor 76 (step S112). When the detection signal is output from the flow sensor 76, the control unit 24 controls the electromagnetic valve 70 to be closed, and stops the output of the second drive signal to the heater driving unit 26 (step S113). . On the other hand, when the detection signal is not output from the flow sensor 76, the control unit 24 outputs the first drive signal to the electromagnetic valve driving unit 25, thereby controlling the electromagnetic valve 70 in the open state for 1 second, for example. (Step S114). Thereby, the control unit 24 performs an air bleeding operation in the hot water storage tank 61. Then, the control unit 24 stops outputting the second drive signal to the heater drive unit 26 after the air bleeding operation in the hot water storage tank 61.

  When the output of the second drive signal from the control unit 24 is stopped, the heater driving unit 26 stops the driving of the heater 71 and stops the boiling of hot water in the hot water storage tank 61 (step S115).

  As described above, the hot water heater 11 in the present embodiment is a hot water heater that supplies the water in the hot water storage tank 61 to the faucet, and from the faucet even at the timing of the air venting operation. The air venting operation is regulated in response to the water discharge. Thereby, the hot water storage type hot water heater 11 can suppress the occurrence of pulsation in the water discharged from the faucet, and can discharge the air in the hot water storage tank 61 without giving the user an unpleasant feeling.

  In addition, the hot water heater 11 in the present embodiment drains the water in the hot water storage tank 61 to the same water tank (sink 100) as the water tank (sink 100) discharged by the faucet when the air venting operation is performed. When draining through the pipe 41, drainage unintended by the user does not occur. Therefore, the air in the hot water storage tank 61 can be discharged without causing discomfort to the user by suddenly starting to drain while using the faucet.

  In the above-described embodiment, the control for not performing the air bleeding operation is described when water is discharged from the faucet even at the timing of the air bleeding operation. However, the present invention is not limited to this. For example, even when the hot water heater 11 is at the timing of the air venting operation, when water is discharged from the faucet, the water is discharged to such an extent that pulsation does not occur in the water discharged from the faucet. The operation may be restricted. That is, the hot water heater 11 has a drain pipe so that pulsation does not occur in the water discharged from the faucet when water is discharged from the faucet even at the timing of the air venting operation. 41 to limit the amount of hot water drained. It should be noted that the regulation of the air bleeding operation includes a case where the air bleeding operation is not performed.

  Further, in the above-described embodiment, the control for restricting the air bleeding operation when water is discharged from the faucet has been described. However, the control for restricting the air bleeding operation is performed by discharging water from the faucet. Need not always be implemented For example, the hot water heater 11 may perform an air bleeding operation when the amount of water discharged is small, such as when the user is operating the faucet in the closing direction to stop water discharge. It is assumed that the amount of water discharged is small when the user has finished using the faucet. In this case, even if pulsation occurs in the small amount of water discharged from the faucet This is because there is a very low possibility of giving a person discomfort. For example, the hot water storage type water heater 11 determines that water has been discharged from the faucet when the flow rate of water flowing into the hot water storage tank detected by the flow sensor 76 exceeds a first threshold value. When the venting operation is restricted and the flow rate of water flowing into the hot water storage tank falls below the second threshold, the regulation of the air venting operation is released. The first threshold value and the second threshold value may be the same or different.

  Further, in the case where the hot water storage water heater 11 described above does not perform the air bleed operation because the period during which water is discharged from the faucet overlaps with the timing of the air bleed operation, the water discharge is stopped within a predetermined time. If the air bleeding operation timing does not arrive, the air bleeding operation may be performed. As a result, the hot water storage water heater 11 can discharge the air in the hot water storage tank 61 without causing discomfort to the user while maintaining the effect of preventing air from being mixed into the water discharged from the faucet. it can. Here, the air is mixed into the water discharged from the faucet when the hot water in the hot water storage tank 61 is not used for a long period of time and the air has accumulated in the upper part of the hot water storage tank 61. The hot water storage water heater 11 sets the predetermined time to be shorter than the time from when air begins to accumulate in the upper part of the hot water storage tank 61 until the air enters the hot water discharged from the hot water storage tank 61 through the hot water pipe 36. Has been. Therefore, as described above, the hot water storage water heater 11 can prevent air from being mixed into the water discharged by the faucet.

  Each unit of the control device 10 may be realized by hardware, may be realized by software, or may be realized by a combination of hardware and software.

  The control device 10 in the above-described embodiment may be realized by a computer. In that case, a program for realizing this function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory inside a computer system serving as a server or a client in that case may be included and a program held for a certain period of time. Further, the program may be a program for realizing a part of the above-described functions, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system. You may implement | achieve using programmable logic devices, such as FPGA (Field Programmable Gate Array).

DESCRIPTION OF SYMBOLS 10 Control apparatus 11 Hot water storage type water heater 20 Temperature determination part 21 Boiling start temperature determination part 22 Boiling stop temperature determination part 23 Air bleeding temperature determination part 24 Control part 25 Electromagnetic valve drive part 26 Heater drive part

Claims (3)

A hot water heater that supplies water from a hot water storage tank to a faucet,
The hot water storage water heater is characterized in that, even at the timing of the air venting operation for discharging the air in the hot water storage tank, the air venting operation is regulated in accordance with the discharge of water from the faucet. . A drain pipe connected to the hot water storage tank;
2. The hot water storage water heater according to claim 1, wherein in the air venting operation, water in the hot water storage tank is drained through the drain pipe to the same water tank as the water tank discharged by the faucet. A flow rate detection unit for detecting a flow rate of water flowing into the hot water storage tank;
Based on the flow rate detected by the flow rate detection unit, it is determined whether or not water is discharged from the faucet, and the air bleeding operation is restricted when it is determined that the water is discharged. The hot water storage type water heater according to claim 1 or 2, characterized in that.

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