JP6998783B2 - Immediate hot water discharge device - Google Patents

Description

The present invention relates to an immediate hot water discharge device.

Conventionally, as seen in Patent Document 1, for example, hot water supplied from a water heater is distributed to a hot water storage tank and a bypass pipe by a distributor, and further distributed to the heated hot water flowing out of the hot water storage tank and the bypass pipe. By mixing with hot water and supplying the mixed hot water to the hot water tap, it is possible to discharge hot water at a higher temperature from the hot water tap even if the temperature of the hot water supplied from the water heater is low. An immediate hot water discharge device (immediate hot water device) is known.

In what is seen in Patent Document 1, an expanded water discharge device is connected to a mixed water pipe for flowing hot water in which hot water supplied from a hot water storage tank and hot water supplied from a bypass pipe are mixed, and the hot water storage tank is used. A part of the expanded water generated by the hot water expanded by the heating of the above can be discharged by the expanded water discharge device.

Japanese Unexamined Patent Publication No. 2017-58057

By the way, when the hot water in the hot water storage tank is heated, the heated hot water tends to first collect on the upper side of the hot water storage tank. In the device seen in Patent Document 1, the mixed water pipe to which the expanded water discharge device is connected is connected to the hot water storage tank via the hot water outlet pipe connected to the upper part of the hot water storage tank.

Therefore, in Patent Document 1, when the hot water in the hot water storage tank is heated, the heated hot water collected on the upper side of the hot water storage tank is easily discharged as expanded water by the expanded water discharge device. Therefore, there is a disadvantage that the amount of heat stored in the hot water storage tank is likely to be lost due to the discharge of expanded water.

The present invention has been made in view of this background, and provides an immediate hot water discharge device capable of discharging expanded water so as to reduce the loss of heat in the hot water storage tank when the hot water in the hot water storage tank is heated. The purpose is to do.

In order to achieve the above object, the immediate hot water discharge device of the present invention has an inflow side pipe connected to the hot water supply pipe so that hot water heated by the heat source machine is supplied from the heat source machine via the hot water supply pipe. ,
A hot water storage tank connected to the inflow side pipe so that hot water can be supplied from the inflow side pipe,
The hot water is connected to the hot water storage tank and the hot water tap so that the hot water in the hot water storage tank can be supplied to the hot water tap, and the hot water is stored at a position above the opening end of the inflow side pipe that opens inside the hot water storage tank. Outflow side piping with an open end that opens inside the tank,
A bypass pipe connected between the inflow side pipe and the outflow side pipe so that hot water can flow from the inflow side pipe to the outflow side pipe without passing through the hot water storage tank.
A heating device that heats the hot water in the hot water storage tank,
The tank side flow rate, which is the flow rate of hot water flowing from the inflow side pipe to the outflow side pipe via the hot water storage tank in the open state of the hot water outlet, and the outflow side from the inflow side pipe through the bypass pipe. The bypass ratio installed in any of the inflow side pipe, the outflow side pipe, and the bypass pipe so that the bypass ratio, which is the ratio of the flow rate of hot water flowing through the pipe to the bypass side flow rate, can be changed. With the regulating valve,
In the hot water storage tank by the heating device, which is connected to any of the inflow side pipe, the outflow side pipe, and the bypass pipe and has a discharge path communicating with the inside of the pipe to be connected. An expanded water discharge device that discharges a part of the expanded water generated by the expanded hot water in the hot water storage tank through the discharge path when the hot water is heated.
It is equipped with a control device that controls the bypass ratio adjusting valve.
The bypass ratio adjusting valve is attached to any of the pipes so as to be located on a flow path from the hot water storage tank to the expanded water discharge device via the outflow side pipe, and the bypass ratio adjustment valve is adjusted. It is configured to shut off the flow path when the valve is controlled to a predetermined operating state.
The control device is characterized in that the bypass ratio adjusting valve is controlled to the predetermined operating state when the hot water in the hot water storage tank is heated by the heating device (first invention).

According to the first invention, the bypass ratio adjusting valve is located on the flow path from the hot water storage tank to the expanded water discharge device via the outflow side pipe, and when the hot water in the hot water storage tank is heated by the heating device, the bypass ratio adjusting valve is located. , It is controlled to the predetermined operating state. Therefore, when the hot water in the hot water storage tank is heated, the flow path from the hot water storage tank to the expanded water discharge device via the outflow side pipe is cut off. Further, the open end of the outflow side pipe is located above the open end of the inflow side pipe. Therefore, the volume of the hot water in the hot water storage tank expands due to heating, and even if the pressure inside the hot water storage tank and the flow path communicating with the hot water storage tank rises due to the expansion of the hot water, the inside of the hot water storage tank remains. It is prevented that the heated hot water (hot water having a higher temperature than the lower side of the hot water storage tank) collected on the upper side is discharged from the discharge path of the expanded water discharge device through the outflow side pipe.

On the other hand, when the hot water in the hot water storage tank is heated, the flow path from the hot water storage tank to the expanded water discharge device via the inflow side pipe is open, and the open end of the inflow side pipe is the outflow side pipe. It is located below the end of the opening. Therefore, when the hot water in the hot water storage tank expands due to heating, the hot water remaining in the inflow side pipe and the hot water near the lower part in the hot water storage tank mainly pass through the inflow side pipe as expansion water. It is discharged from the discharge channel of the expanded water discharge device. As a result, the pressure in the hot water storage tank is reduced.

In this case, the hot water in the inflow side pipe is hot water that has not been heated by the heating device, and the hot water on the lower side in the hot water storage tank is more likely to have a lower temperature than the hot water on the upper side. Then, since these hot waters are mainly discharged as expanded water, the loss of heat in the hot water storage tank is suppressed.

Therefore, according to the first invention, when the hot water in the hot water storage tank is heated, the expanded water can be discharged so as to reduce the loss of the amount of heat in the hot water storage tank.

More specifically, the first invention may adopt the configuration described below. For example, the bypass ratio adjusting valve is located downstream of the connection portion of the bypass pipe of the inflow side pipe so that the flow rate of hot water flowing into the hot water storage tank from the inflow side pipe can be adjusted. The flow rate adjusting valve is assembled in the above, and the predetermined operating state of the flow rate adjusting valve is the closed state of the flow rate adjusting valve, and the expanded water discharge device is on the downstream side of the flow rate adjusting valve. The aspect of being connected to the inflow side pipe may be adopted (second invention).

In the second invention, in the predetermined operating state (valve closed state) of the flow rate adjusting valve, the flow path from the hot water storage tank to the expanded water discharge device via the outflow side pipe, the bypass pipe and the inflow side pipe is provided. It is shut off by the flow control valve in the inflow side piping. Then, the hot water remaining in the inflow side pipe on the downstream side of the flow rate adjusting valve and the hot water on the lower side of the hot water storage tank are mainly discharged as expanded water from the discharge path of the expanded water discharge device.

Alternatively, the bypass ratio adjusting valve is located upstream of the connection portion of the bypass pipe of the outflow side pipe so that the flow rate of hot water flowing out from the hot water storage tank to the outflow side pipe can be adjusted. The flow rate adjusting valve is assembled to the above, and the predetermined operating state of the flow rate adjusting valve is the closed state of the flow rate adjusting valve, and the expanded water discharge device is the inflow side pipe or the bypass pipe. , Or the aspect of being connected to the outflow side pipe on the downstream side of the flow rate adjusting valve can be adopted (third invention).

In the third invention, in the predetermined operating state (valve closed state) of the flow control valve, the flow path from the hot water storage tank to the expanded water discharge device via the outflow side pipe, the bypass pipe and the inflow side pipe, or , The flow path from the hot water storage tank to the expanded water discharge device via the outflow side pipe and the bypass pipe, or the flow path from the hot water storage tank to the expanded water discharge device through the outflow side pipe, is adjusted by the outflow side pipe. It is shut off by a valve. When the hot water in the hot water storage tank expands due to heating, the hot water remaining in the outflow side pipe on the downstream side of the flow control valve, the bypass pipe and the inflow side pipe communicating with the flow control valve, and the hot water near the bottom of the hot water storage tank are mainly used. The hot water on the side is discharged as expanded water from the discharge path of the expanded water discharge device.

Further, the bypass ratio adjusting valve is provided at the connection portion of the bypass pipe of the inflow side pipe, and hot water flowing in from the upstream side of the inflow side pipe is sent to the hot water storage tank on the downstream side of the inflow side pipe. It is a distribution valve that can be distributed to the hot water to be supplied and the hot water to be supplied to the bypass pipe, and the distribution ratio thereof can be variably controlled. It is an operating state of blocking the flow of hot water from the inflow side pipe to the inflow side pipe on the downstream side of the distribution valve, and the expanded water discharge device is connected to the inflow side pipe on the downstream side of the distribution valve. It is also possible to adopt the aspect of being (4th invention).

In the fourth invention, in the predetermined operating state of the distribution valve, the flow path from the hot water storage tank to the expanded water discharge device via the outflow side pipe, the bypass pipe and the inflow side pipe is the bypass pipe and the inflow side pipe. It is shut off by the distribution valve that connects the. When the hot water in the hot water storage tank expands due to heating, the hot water remaining in the inflow side piping on the downstream side of the distribution valve and the hot water on the lower side of the hot water storage tank are mainly used as the expansion water in the expansion water discharge device. It is discharged from the discharge channel.

Further, the bypass ratio adjusting valve is provided at the connection portion of the bypass pipe of the outflow side pipe, and has hot water flowing from the hot water storage tank on the upstream side of the outflow side pipe and hot water flowing from the bypass pipe. Is a mixing valve that can be mixed and supplied to the hot water tap and the mixing ratio can be variably controlled, and the predetermined operating state of the mixing valve is from the outflow side pipe on the upstream side of the mixing valve. It is also possible to adopt an mode in which the flow of hot water to the downstream side of the mixing valve is blocked, and the expanded water discharge device is connected to the inflow side pipe or the bypass pipe (first). 5 inventions).

In the fifth invention, in the predetermined operating state of the mixing valve, the flow path from the hot water storage tank to the expanded water discharge device via the outflow side pipe, the bypass pipe and the inflow side pipe, or the outflow side from the hot water storage tank. The flow path to the expanded water discharge device via the pipe and the bypass pipe is cut off by the mixing valve connecting the bypass pipe and the outflow side pipe. When the hot water in the hot water storage tank expands due to heating, the hot water remaining in the inflow side pipe and the bypass pipe and the hot water near the lower part of the hot water storage tank mainly serve as expanded water from the discharge path of the expanded water discharge device. It is discharged.

The figure which shows the whole structure of the system including the immediate hot water discharge device in 1st Embodiment of this invention. The block diagram which shows the structure which concerns on the control of the immediate hot water discharge device of embodiment. The figure which shows the whole structure of the system including the immediate hot water discharge device in the 2nd Embodiment of this invention. The figure which shows the whole structure of the system including the immediate hot water discharge device in the 3rd Embodiment of this invention. The figure which shows the whole structure of the system including the immediate hot water discharge device in 4th Embodiment of this invention. The figure which shows the whole structure of the system including the immediate hot water discharge device in 5th Embodiment of this invention.

[First Embodiment]
The first embodiment of the present invention will be described below with reference to FIGS. 1 and 2. With reference to FIG. 1, the immediate hot water discharge device 20A of the present embodiment immediately discharges hot water from any one hot water tap 1 to be hot water supplied in any dwelling unit provided with a water heater 3 capable of executing hot water supply operation. It is a device installed to obtain.

The hot water tap 1 is a hot water tap arranged in, for example, a kitchen, a washroom, a bathroom, or the like. In FIG. 1, the hot water tap 1 is described as a faucet (faucet), but the hot water tap 1 is not limited to the faucet, and may be, for example, a shower or a complex of a shower and a faucet. ..

The water heater 3 includes a heat source machine 4 as its main body. The heat source machine 4 is, for example, a combustion type heat source machine having a burner and a heat exchanger built-in (not shown), and has a water supply pipe 5 for introducing hot water supply water such as tap water into the heat source machine 4 and a heat source machine 4. It is connected to a hot water supply pipe 6 that supplies hot water for hot water supply (hot water) heated by the combustion heat of the burner to each hot water supply target portion including the hot water tap 1. The fuel of the burner may be either a gas fuel or a liquid fuel such as kerosene.

The hot water supply pipe 6 is derived from the heat source machine 4, and its downstream portion (downstream portion leading to the hot water tap 1) is connected to the hot water tap 1 via the immediate hot water tap device 20A. A hot water tap other than the hot water tap 1 may be connected to the hot water supply pipe 6.

The water heater 3 further includes a controller 8 for controlling the operation of the heat source machine 4 and a remote controller 9 for operating the water heater 3. The remote controller 9 is arranged in a kitchen, a bathroom, or the like, and can perform wired communication (or wireless communication) with the controller 8. By operating this remote controller 9, the controller 8 is instructed to start or stop the water heater 3, and the target of the temperature (hot water supply temperature) of the hot water supplied from the heat source machine 4 to each hot water supply target portion including the hot water tap 1. It is possible to set the value and so on.

Although only a single remote controller 9 is shown in FIG. 1, the water heater 3 may further include one or more remote controllers other than the remote controller 9.

The controller 8 (hereinafter referred to as a hot water supply controller 8) is composed of one or more electronic circuit units including, for example, a microcomputer, a memory, an interface circuit, and the like, and is mounted on the heat source machine 4. Then, the hot water supply controller 8 controls the operation of the heat source machine 4 related to the hot water supply operation by the mounted hardware configuration and program (software configuration).

Specifically, when water flow through the water supply pipe 5 is started by opening any of the water taps such as the hot water tap 1, the hot water supply controller 8 notifies the start of the water flow by a water flow switch or a water flow switch (not shown). It is detected via a sensor such as a flow rate sensor, and the combustion operation of the burner of the heat source machine 4 is started according to the detection. As a result, the hot water supply water introduced from the water supply pipe 5 to the heat source machine 4 is heated by the combustion heat of the burner via the heat exchanger, and the heated hot water supply water (hot water) becomes the opened hot water tap. It is supplied from the heat source machine 4 via the hot water supply pipe 6.

Then, the hot water supply controller 8 sets the burning amount of the burner so that the actual hot water supply temperature to the opened hot water tap matches or almost matches the target value (hereinafter referred to as the hot water supply target temperature) set by the remote controller 9. Control.

Supplementally, the heat source machine 4 of the water heater 3 is not limited to the combustion type heat source machine, but is a heat source machine equipped with an electric heat generating part (including a heat pump type) instead of the burner or in addition to the burner. There may be. Further, the water heater 3 is configured to be capable of not only a hot water supply operation but also a bath operation such as a hot water beam to a bathtub, or an operation of supplying hot water to a hot water type heating device such as a bathroom heating device. May be good.

The immediate hot water outlet device 20A is installed on the hot water flow path from the heat source machine 4 to the hot water tap 1 at a position sufficiently closer to the hot water tap 1 than the heat source machine 4 (position closer to the hot water tap 1). The immediate hot water discharge device 20A includes a hot water storage tank 21, an inflow side pipe 30 connected to the downstream end of the hot water supply pipe 6, and an outflow side pipe 31 connected to the hot water tap 1.

The downstream end of the inflow side pipe 30 is a portion near the lower part of the hot water storage tank 21 so that hot water flowing into the inflow side pipe 30 from the hot water supply pipe 6 (hot water entering the immediate hot water outlet device 20A) can be supplied to the hot water storage tank 21. , For example, connected to the lower end. In this case, the opening end portion 30c formed at the downstream end of the inflow side pipe 30 is open to the inside of the hot water storage tank 21. The downstream end (opening end 30c) of the inflow side pipe 30 is the lower side (preferably the lower side of the heater 22 described later) of the open end 31c of the outflow side pipe 31, which will be described later, and the side surface of the hot water storage tank 21. It may be connected to the unit.

Further, the upstream portion of the outflow side pipe 31 is introduced into the hot water storage tank 21 so that the hot water in the hot water storage tank 21 can be supplied to the hot water tap 1. In this case, the open end 31c formed at the upstream end of the outflow side pipe 31 is located near the upper part of the hot water storage tank 21 (and thus above the open end 30c of the inflow side pipe 30). It is open in 21. The upstream end (opening end 31c) of the outflow side pipe 31 may be connected to a portion closer to the upper part of the hot water storage tank 21.

Inside the hot water storage tank 21, an electric heater 22 as a heating device for heating the hot water in the hot water storage tank 21 and a rectifying plate 23 for rectifying the hot water flowing into the hot water storage tank 21 from the inflow side pipe 30. And are incorporated. In the present embodiment, the heater 22 is arranged, for example, above the open end 30c of the inflow side pipe 30 and below the open end 31c of the outflow side pipe 31. The heater 22 may be mounted on the side surface of the hot water storage tank 21, for example. Further, the heater 22 may be provided, for example, so as to extend vertically inside or on the side surface of the hot water storage tank 22.

Further, on the outer peripheral portion of the hot water storage tank 21, a temperature sensor 24 for detecting the temperature of the hot water in the hot water storage tank 21 (hereinafter referred to as hot water storage temperature Ttk) and when the hot water storage tank 21 becomes overheated at an excessively high temperature. A thermostat 25 for preventing overheating that forcibly cuts off the power supply to the heater 22 and a heat insulating material 26 that covers the upper part of the hot water storage tank 21 in order to improve the heat retention of the hot water storage tank 21 are attached.

A bypass that forms a flow path for flowing hot water from the inflow side pipe 30 to the outflow side pipe 31 without passing through the hot water storage tank 21 between the middle part 30a of the inflow side pipe 30 and the middle part 31a of the outflow side pipe 31. The pipe 32 is connected in parallel with the hot water storage tank 21.

Then, in the portion of the inflow side pipe 30 on the downstream side of the intermediate portion 30a (the connection portion of the bypass pipe 32), the flow rate of hot water flowing into the hot water storage tank 21 from the intermediate portion 30a (hereinafter, the flow rate on the tank side). A flow rate adjusting valve 33 that functions as a bypass ratio adjusting device that changes the bypass ratio, which is the ratio between the flow rate of hot water flowing into the bypass pipe 32 from the intermediate portion 30a (hereinafter referred to as the bypass side flow rate), is interposed. ing.

The flow rate adjusting valve 33 is composed of an electromagnetic proportional valve whose opening degree can be changed between a fully closed state and a fully open state, an electric servo valve, or the like, and changes the opening degree of the flow rate adjusting valve 33. By making it possible, it is possible to change the bypass ratio.

A temperature sensor 34 for detecting the temperature of hot water supplied from the hot water supply pipe 6 (hereinafter referred to as water inlet temperature Tin) and a hot water supply pipe 6 are supplied to the portion upstream of the intermediate portion 30a of the inflow side pipe 30. A flow rate sensor 35 that detects the flow rate of hot water (hereinafter referred to as the incoming water flow rate Win) and a valve mechanism 36 composed of a pressure reducing valve and a check valve (not shown) are assembled.

An expanded water discharge device 37 for discharging a part of the expanded water generated by the hot water expanded by heating in the hot water storage tank 21 is connected to the portion downstream of the flow rate adjusting valve 33 of the inflow side pipe 30. .. The expanded water discharge device 37 communicates with the inside of the inflow side pipe 30 (and by extension, communicates with the inside of the hot water storage tank 21 via the inflow side pipe 30), and the pressure of the hot water in the hot water storage tank 21. Has an overpressure relief valve 37b that opens when the pressure rises above a predetermined value, and the overpressure relief valve 37b is interposed in the discharge passage 37a.

The temperature of the hot water flowing out from the hot water storage tank 21 to the outflow side pipe 31 (hereinafter referred to as the tank outflow temperature Ttout) is detected in the part upstream of the middle part 31a (the connection part of the bypass pipe 32) of the outflow side pipe 31. The temperature sensor 39 is assembled. Further, in the portion downstream of the intermediate portion 31a of the outflow side pipe 31, the temperature of the hot water supplied from the intermediate portion 31a to the hot water tap 1 and discharged from the hot water tap 1 (hereinafter referred to as the hot water temperature Tout) is applied. A temperature sensor 40 for detection is assembled. The middle portion 31a of the outflow side pipe 31 is a portion where the hot water that has passed through the bypass pipe 32 and the hot water that has flowed out from the hot water storage tank 21 to the outflow side pipe 31 are mixed, and is hereinafter referred to as a mixing portion 31a.

In the middle part of the outflow side pipe 31 (in the illustrated example, the mixing part 31a), water for draining hot water or the like in the hot water storage tank 21 during maintenance of the immediate hot water discharge device 20A or when not in use. The pulling pipe 41 is connected. A drain plug 42 that can be opened and closed manually is attached to the downstream end of the drain pipe 41.

The immediate hot water discharge device 20A further comprises turning on / off the power of the controller 45 (hereinafter referred to as the immediate hot water discharge controller 45) that controls the operation of the heater 22 of the hot water storage tank 21 and the flow rate adjusting valve 33, and the immediate hot water discharge device 20A. It is provided with an operation unit 50 for setting an operation condition of the immediate hot water discharge device 20A and the like.

The operation unit 50 is provided with an operation switch, a display unit, and the like (not shown). The immediate hot water discharge controller 45 corresponds to the control device in the present invention, is composed of one or more electronic circuit units including a microcomputer, a memory, an interface circuit, etc., and operates the operation unit 50 as shown in FIG. At the same time as the signal is input, the detection signals of the temperature sensors 24, 34, 39, 40 and the flow rate sensor 35 are input.

Further, in the present embodiment, the immediate hot water supply controller 45 can perform wired communication (or wireless communication) with the hot water supply controller 8, and information indicating the hot water supply target temperature set by the remote controller 9 or the like by this communication or the like. It is possible to get.

Then, the immediate hot water discharge controller 45 controls the operation of the flow rate adjusting valve 33 and the heater 22 by the functions realized by the mounted hardware configuration and the program.

The distribution valve 51 in FIG. 2 is a bypass ratio adjusting valve in the fourth embodiment described later, and the mixing valve 52 is a bypass ratio adjusting valve in the fifth embodiment described later.

Next, the operation of the immediate hot water discharge device 20A of the present embodiment will be described. When the detection value of the hot water storage temperature Ttk indicated by the detection signal of the temperature sensor 24 is lower than the predetermined temperature, the immediate hot water discharge controller 45 raises the hot water storage temperature Ttk to the target hot water storage temperature Ttk_cmd, which is the target value. The hot water in the hot water storage tank 21 is boiled, and the heater 22 is operated so as to maintain (keep warm) the hot water storage temperature Ttk at or almost the same as the target hot water storage temperature Ttk_cmd.

More specifically, the immediate hot water controller 45 has, for example, hot water having a temperature that matches or almost matches the immediate hot water target temperature Tout_cmd as a predetermined target value of the hot water temperature Tout in a predetermined period immediately after opening the hot water tap 1. The target hot water storage temperature Ttk_cmd is calculated by a predetermined calculation formula or the like so that the amount of heat that can be continuously supplied to the hot water tap 1 is stored in the hot water in the hot water storage tank 21.

In this case, the immediate hot water output target temperature Tout_cmd is, for example, a hot water supply target temperature set by the water heater 3, a value preset by the operation of the operation unit 50, or a hot water supply that can be set by the water heater 3. The minimum value of the possible range of the target temperature can be adopted.

Further, the predetermined period is a period after the hot water tap 1 is opened (after the start of water entering the immediate hot water tap 20A) until the temperature detected by the temperature sensor 34 rises to a temperature equal to or higher than the predetermined temperature. Or, after opening the hot water tap 1 (after the start of water entry into the immediate hot water outlet device 20A) until a predetermined time elapses, or after opening the hot water tap 1 (after the start of water entry into the immediate hot water discharge device 20A). After the start), a period until the total amount of hot water entering the immediate hot water discharge device 20A reaches a predetermined value can be adopted.

Then, the immediate hot water discharge controller 45 controls the heater 22 so that the actual hot water storage temperature Ttk in the hot water storage tank 21 matches or substantially matches the target hot water storage temperature Ttk_cmd determined as described above.

More specifically, in the immediate hot water discharge controller 45, water is not passed through the hot water tap 1 (water enters the immediate hot water discharge device 20A), and the detection value of the hot water storage temperature Ttk by the temperature sensor 24 is the target hot water storage. When the temperature is lower than the predetermined value Ttk_cmd, the hot water storage temperature Ttk is raised to the target hot water storage temperature Ttk_cmd by starting the heat generation operation of the heater 22 (the hot water in the hot water storage tank 21 is boiled).

After that, the immediate hot water discharge controller 45 keeps the hot water storage temperature Ttk at a temperature that matches or almost matches the target hot water storage temperature Ttk_cmd until the water input to the immediate hot water discharge device 20A corresponding to the opening of the hot water tap 1 is started. , The heat generation operation and the operation stop of the heater 22 are alternately repeated.

Further, the immediate hot water discharge controller 45 controls the flow rate adjusting valve 33 to be in a closed state when the heater 22 is operated (during heat generation operation) in a state where water is not flowing to the hot water tap 1.

Here, when the hot water in the hot water storage tank 21 is heated by the heat generation operation of the heater 22, the hot water in the hot water storage tank 21 expands due to the temperature rise, so that the hot water storage tank 21 and the flow path communicating with the hot water storage tank 21 (specifically,). , The pressure inside the inflow side pipe 30, the outflow side pipe 31, the bypass pipe 32, and the discharge path 37a) on the upstream side of the overpressure relief valve 37b of the expanded water discharge device 37 increases. Then, when the pressure exceeds a predetermined value, the overpressure relief valve 37b opens.

In this case, in the present embodiment, the heater 22 is heated and operated with the flow rate adjusting valve 33 as the bypass ratio adjusting device closed. Therefore, when the overpressure relief valve 37b is opened, the overpressure relief valve is operated. The hot water remaining in the discharge passage 37a on the upstream side of 37b, the inflow side pipe 30 on the downstream side of the flow control valve 33, and the hot water in the portion near the lower part of the hot water storage tank 21 are overpressure relief valves corresponding to the pressure drop. Until the valve of 37b is closed, the one close to the overpressure relief valve 37b is discharged from the discharge path 37a as expanded water.

More specifically, in the present embodiment, the expanded water discharge device 37 is assembled to the inflow side pipe 30 on the downstream side of the flow rate adjusting valve 33. Further, the open end portion 31c of the outflow side pipe 31 is open in the hot water storage tank 21 at a portion near the upper part of the hot water storage tank 21 (and by extension, above the open end portion 30c of the inflow side pipe 30). In addition, in the present embodiment, the heater 22 is arranged below the open end portion 31c of the outflow side pipe 31 and above the open end portion 30c of the inflow side pipe 30.

Therefore, in a situation where water is not flowing to the hot water tap 1, if the hot water in the hot water storage tank 21 is heated by the heater 22 with the flow rate adjusting valve 33 opened, the hot water storage tank 21 Since the flow path from the portion near the upper part to the expanded water discharge device 37 via the outflow side pipe 31 and the bypass pipe 32 is open, among the hot water in the hot water storage tank 21, the hot water storage tank 21 The heated hot water that tends to collect on the upper side of the pipe and the heated hot water in the vicinity of the opening end 31c in the outflow side pipe 31 flow into the discharge path 37a as expansion water via the outflow side pipe 31. The phenomenon of being discharged is likely to occur.

However, in the present embodiment, since the flow rate adjusting valve 33 is closed during the heat generation operation of the heater 22, the flow rate adjusting valve 33 reaches the discharge path 37a of the expanded water discharge device 37 from the hot water storage tank 21 through the outflow side pipe 31. The flow path is cut off by the flow rate adjusting valve 33.

Therefore, the hot water remaining in the discharge path 37a on the upstream side of the overpressure relief valve 37b and the inflow side pipe 30 on the downstream side of the flow rate adjusting valve 33 (hot water not heated by the heater 22) and in the hot water storage tank 21. As described above, the hot water on the lower side, which tends to have a temperature relatively lower than that on the upper side, is discharged from the discharge path 37a as expansion water from the one close to the overpressure relief valve 37b.

Next, the operation of the immediate hot water discharge device 20A during the hot water discharge operation (during the operation of discharging hot water from the hot water tap 1) will be described. When water enters the immediate hot water outlet device 20A (water entry of a predetermined flow rate or more) in response to the opening of the hot water outlet plug 1, the immediate hot water discharge controller 45 detects the water entry based on the detection signal of the flow rate sensor 35.

At this time, the immediate hot water discharge controller 45 receives the detection values of the incoming water temperature Tin, the tank outflow temperature Ttout and the hot water temperature Tout by the temperature sensors 34, 39 and 40, and the detected values of the incoming water flow Win by the flow sensor 35. Using the immediate hot water target temperature Tout_cmd, the target bypass ratio, which is the target value of the bypass ratio, is sequentially determined by a predetermined calculation formula so that the hot water temperature Tout can match or almost match the immediate hot water target temperature Tout_cmd.

In this case, the immediate hot water target temperature Tout_cmd may be basically the same as the value used when calculating the target hot water storage temperature Ttk_cmd, but before the completion of boiling the hot water in the hot water storage tank 21, the hot water tap 1 is used. When the hot water discharge is started, a temperature lower than the value used when calculating the target hot water storage temperature Ttk_cmd may be used as the immediate hot water discharge target temperature Tout_cmd.

Then, the immediate hot water discharge controller 45 controls the opening degree of the flow rate adjusting valve 33 according to the determined target bypass ratio. As a result, immediately after opening the hot water tap 1, hot water having a temperature that matches or almost matches the immediate hot water target temperature Tout_cmd is discharged from the hot water tap 1. After that, when the hot water heated by the heat source machine 4 enters the immediate hot water discharge device 20A, the hot water in the heated state is discharged from the hot water tap 1. In the present embodiment, the hot water discharge operation of the immediate hot water discharge device 20A is performed as described above.

In this embodiment, when the hot water in the hot water storage tank 21 is heated, as described above, the flow rate from the hot water storage tank 21 to the expansion water discharge device 37 through the outflow side pipe 31 is from the flow rate adjusting valve 33 in a closed state. Hot water (hot water not heated by the heater 22) and hot water storage tank remaining in the discharge path 37a on the upstream side of the overpressure relief valve 37b and the inflow side pipe 30 on the downstream side of the flow rate adjusting valve 33 in the shut off state. The hot water on the lower side, which tends to have a lower temperature than the upper side in 21, is discharged from the discharge path 37a as expanded water. Therefore, when the hot water in the hot water storage tank 21 is heated, the heated hot water in the upper portion of the hot water storage tank 21 is prevented from being discharged as expanded water. Therefore, the loss of heat in the hot water storage tank 21 can be suppressed as much as possible. As a result, the hot water in the hot water storage tank 21 can be efficiently heated.

Further, in the present embodiment, it is also prevented that the heated hot water remaining in the outflow side pipe 31 is discharged as expanded water. Therefore, it is possible to improve the utilization efficiency of the amount of heat stored in the hot water heated by the heater 22.

Further, in the present embodiment, since the flow rate adjusting valve 33 as the bypass ratio adjusting device is assembled to the inflow side pipe 30, the inflow side pipe 30 is always communicated with the outflow side pipe 31 via the bypass pipe 32. ing. Therefore, even if a problem occurs in which the flow rate adjusting valve 33 is held in the fully open state due to a failure of the flow rate adjusting valve 33 or the like, the hot water flowing out from the hot water storage tank 21 to the outflow side pipe 31 and the inflow. The hot water flowing from the side pipe 30 via the bypass pipe 32 is mixed by the mixing unit 31a, and the mixed hot water is supplied to the hot water tap 1.

Therefore, even if the boiling temperature of the hot water in the hot water storage tank 21 is raised, the temperature of the hot water discharged from the hot water tap 1 can be made lower than the temperature of the hot water in the hot water storage tank 21.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG. Since this embodiment differs from the first embodiment only in a part of the configuration, the same matters as those of the first embodiment will be omitted.

With reference to FIG. 3, in the immediate hot water discharge device 20B of the present embodiment, the flow rate adjusting valve 33 as the bypass ratio adjusting valve is assembled to the outflow side pipe 31 on the upstream side of the mixing portion 31a instead of the inflow side pipe 30. Has been done. That is, in the present embodiment, the flow rate adjusting valve 33 is assembled to the outflow side pipe 31 in the flow path from the hot water storage tank 21 to the expanded water discharge device 37 via the outflow side pipe 31 and the bypass pipe 32.

Other than this, the configuration of the immediate hot water discharge device 20B of the present embodiment is the same as that of the immediate hot water discharge device 20A of the first embodiment. Further, in the present embodiment, the operation control of the flow rate adjusting valve 33 and the heater 22 is also performed in the same manner as in the first embodiment.

In this embodiment, since the flow rate adjusting valve 33 is controlled to be closed when the hot water in the hot water storage tank 21 is heated, the discharge passage 37a on the upstream side and the inflow side pipe 30 are mainly used for the overpressure relief valve 37b. The hot water remaining in the bypass pipe 32 and the hot water on the lower side, which tends to have a temperature relatively lower than that on the upper side in the hot water storage tank 21, are discharged from the discharge path 37a as expansion water. Therefore, as in the first embodiment, when the hot water in the hot water storage tank 21 is heated, the heated hot water in the upper portion of the hot water storage tank 21 is prevented from being discharged as expanded water, so that the hot water storage tank 21 is prevented from being discharged. The loss of the amount of heat in 21 can be suppressed as much as possible. As a result, the hot water in the hot water storage tank 21 can be efficiently heated.

Further, even if a problem occurs in which the flow rate adjusting valve 33 is held in the fully open state due to a failure of the flow rate adjusting valve 33 or the like, the hot water flowing out from the hot water storage tank 21 to the outflow side pipe 31 and the inflow side The hot water flowing from the pipe 30 via the bypass pipe 32 is mixed in the mixing section 31a, and the mixed hot water is supplied to the hot water tap 1, so that the boiling temperature of the hot water in the hot water storage tank 21 is adjusted. Even if the temperature is raised, the temperature of the hot water discharged from the hot water tap 1 can be set to be lower than the temperature of the hot water in the hot water storage tank 21.

In the present embodiment, the expanded water discharge device 37 is, for example, an intermediate portion 30a (bypass pipe 32) of the inflow side pipe 30 as illustrated by a two-dot chain line having a reference numeral 37 (1) in FIG. It may be connected to a portion on the upstream side of the connection portion). Alternatively, the expanded water discharge device 37 may be connected to the bypass pipe 32, for example, as illustrated by the alternate long and short dash line with the reference numeral 37 (2) in FIG. Alternatively, the expanded water discharge device 37 is connected to the outflow side pipe 31 on the downstream side of the flow rate adjusting valve 33, for example, as illustrated by the two-dot chain line designated with the reference numeral 37 (3) in FIG. May be good.

However, when the hot water in the hot water storage tank 21 is heated by the heater 22, the hot water remaining in the outflow side pipe 31 on the downstream side of the flow rate adjusting valve 33 (hot water after heating) is prevented from being discharged as expanded water as much as possible. Then, it is preferable to provide the expanded water discharge device 37 as shown by reference numerals 37, 37 (1) and 37 (2) in FIG. 3 rather than as shown by reference numeral 37 (3) in FIG.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG. Since this embodiment differs from the first embodiment only in a part of the configuration, the same matters as those of the first embodiment will be omitted.

With reference to FIG. 4, in the immediate hot water discharge device 20C of the present embodiment, the flow rate adjusting valve 33 as the bypass ratio adjusting valve is assembled to the bypass pipe 32 instead of the inflow side pipe 30. That is, in the present embodiment, the flow rate adjusting valve 33 is assembled to the bypass pipe 32 of the flow rate from the hot water storage tank 21 to the expanded water discharge device 37 via the outflow side pipe 31 and the bypass pipe 32.

Other than this, the configuration of the immediate hot water discharge device 20C of the present embodiment is the same as that of the immediate hot water discharge device 20A of the first embodiment. Further, in the present embodiment, the operation control of the flow rate adjusting valve 33 and the heater 22 is also performed in the same manner as in the first embodiment.

In this embodiment, since the flow rate adjusting valve 33 is controlled to be closed when the hot water in the hot water storage tank 21 is heated, the discharge path 37a on the upstream side of the overpressure relief valve 37b and the upstream side of the flow rate adjusting valve 33. The hot water remaining in the bypass pipe 32 and the inflow side pipe 30 and the hot water on the lower side, which tends to have a relatively lower temperature than the upper side in the hot water storage tank 21, are close to the overpressure relief valve 37b. Is discharged from the discharge path 37a as expanded water. Therefore, as in the first embodiment, when the inside of the hot water storage tank 21 is heated, the heated hot water in the upper portion of the hot water storage tank 21 is prevented from being discharged as expanded water, so that the inside of the hot water storage tank 21 is prevented from being discharged. The loss of heat can be suppressed as much as possible. Further, since the hot water after heating remaining in the outflow side pipe 31 is prevented from being discharged as expanded water, it is possible to improve the utilization efficiency of the amount of heat stored in the hot water heated by the heater 22.

In the present embodiment, the expanded water discharge device 37 is, for example, an intermediate portion 30a (bypass pipe 32) of the inflow side pipe 30 as illustrated by a two-dot chain line having a reference numeral 37 (1) in FIG. It may be connected to a portion on the upstream side of the connection portion). Alternatively, the expanded water discharge device 37 may be connected to an intermediate portion 30a of the inflow side pipe 30. Alternatively, the expanded water discharge device 37 may be connected to the bypass pipe 32 on the upstream side of the flow rate adjusting valve 33, for example, as illustrated by the alternate long and short dash line with the reference numeral 37 (2) in FIG. good.

[Fourth Embodiment]
Next, the fourth embodiment of the present invention will be described with reference to FIG. Since this embodiment differs from the first embodiment only in a part of the configuration, the same matters as those of the first embodiment will be omitted.

With reference to FIG. 5, in the immediate hot water discharge device 20D of the present embodiment, the distribution valve 51 is assembled to the inflow side pipe 30 instead of the flow rate adjusting valve 33, and the bypass pipe 32 flows in through the distribution valve 51. It is connected to the side pipe 30.

More specifically, the distribution valve 51 is composed of an electric three-way valve or the like, and has one inlet port 51a connected to an upstream portion of the inflow side pipe 30 and a downstream portion of the inflow side pipe 30. And two outlet ports 51b, 51c, respectively, connected to the bypass pipe 32.

Then, the distribution valve 51 supplies hot water supplied from the hot water supply pipe 6 to the inflow side pipe 30 (hot water flowing into the inlet port 51a) from the two outlet ports 51b and 51c to the inflow side pipe 30 on the hot water storage tank 21 side. And the bypass pipe 32 can be distributed and discharged, and the distribution ratio can be variably controlled. In this case, either one of the outlet ports 51b and 51c is closed (and thus, the flow rate of hot water from the distribution valve 51 to the inflow side pipe 30 on the downstream side, or the hot water from the distribution valve 51 to the bypass pipe 32. It is also possible to make the flow rate of

Here, the distribution ratio is specifically distributed to the flow rate of the hot water distributed to the hot water storage tank 21 (that is, the flow rate on the tank side) and the bypass pipe 32 among the total flow rate of the hot water flowing into the distribution valve 51. It is a ratio with the flow rate of the hot water to be made (that is, the flow rate on the bypass side). Therefore, the distribution ratio corresponds to the bypass ratio, in other words.

The configuration of the immediate hot water discharge device 20D of the present embodiment is the same as that of the immediate hot water discharge device 20A of the first embodiment except for the matters described above. Then, in the present embodiment, the immediate hot water discharge controller 45 is in an operating state (in other words, distribution) in which the distribution valve 51 is closed and the outlet port 51c on the bypass pipe 32 side is closed when the hot water in the hot water storage tank 21 is heated. Control is performed to block the flow of hot water from the inflow side pipe 30 on the upstream side of the valve 51 to the bypass pipe 32).

Further, during the hot water discharge operation of the immediate hot water discharge device 20D, the immediate hot water discharge controller 45 determines the target bypass ratio as in the first embodiment, and controls the distribution ratio of the distribution valve 51 according to the target bypass ratio.

The operation control of the immediate hot water discharge device 20D other than the operation control of the distribution valve 51 is the same as that of the immediate hot water discharge device 20A of the first embodiment.

In the immediate hot water discharge device 20D of the present embodiment described above, when the hot water in the hot water storage tank 21 is heated, the distribution valve 51 is controlled to the operating state in which the outlet port 51c on the bypass pipe 32 side is closed. Therefore, the flow path from the hot water storage tank 21 to the expanded water discharge device 37 through the outflow side pipe 31 is cut off by the distribution valve 51. Then, in this state, the hot water inside the discharge passage 37a on the upstream side of the overpressure relief valve 37b and the hot water inside the inflow side pipe 30 (hot water not heated by the heater 22) and the upper side in the hot water storage tank 21. The hot water on the lower side, which tends to have a relatively lower temperature than the above, is discharged from the discharge path 37a as expansion water from the one close to the overpressure relief valve 37b.

Therefore, as in the first embodiment, when the hot water in the hot water storage tank 21 is heated, the heated hot water in the upper portion of the hot water storage tank 21 is prevented from being discharged as expanded water, so that the hot water storage tank 21 is prevented from being discharged. The loss of the amount of heat in 21 can be suppressed as much as possible. As a result, the hot water in the hot water storage tank 21 can be efficiently heated. Further, since the hot water after heating remaining in the outflow side pipe 31 is prevented from being discharged as expanded water, it is possible to improve the utilization efficiency of the amount of heat stored in the hot water heated by the heater 22.

In the present embodiment, the expanded water discharge device 37 is attached to the inflow side pipe 30 on the upstream side of the distribution valve 51, for example, as illustrated by the alternate long and short dash line with the reference numeral 37 (1) in FIG. It may be connected.

Further, in the present embodiment, the distribution valve 51 is controlled to be in an operating state in which the outlet port 51c on the bypass pipe 32 side is closed when the hot water in the hot water storage tank 21 is heated. However, when the expansion water discharge device 37 is connected to the inflow side pipe 30 on the downstream side of the distribution valve 51, the distribution valve 51 is connected to the outlet port on the hot water storage tank 21 side when the hot water in the hot water storage tank 21 is heated. Controlled to an operating state in which the valve 51b is closed (in other words, an operating state in which the flow of hot water from the inflow side pipe 30 on the upstream side of the distribution valve 51 to the inflow side pipe 30 on the downstream side of the distribution valve 51 is cut off). You may.

Supplementally, the expansion water discharge device 37 is connected to the inflow side pipe 30 on the downstream side of the distribution valve 51, and the outlet port 51b on the hot water storage tank 21 side of the distribution valve 51 is closed when the hot water of the hot water storage tank 21 is heated. In the embodiment for controlling the operating state to be in the valve state, the distribution valve 51 may be configured so that the minimum opening degree of the outlet port 51c on the bypass pipe 32 side is maintained at an opening degree larger than zero. .. In this case, even if a problem occurs in which the outlet port 51c on the bypass pipe 32 side of the distribution valve 51 is held at the minimum opening, the hot water storage tank 21 as in the first embodiment. The hot water flowing out from the outflow side pipe 31 and the hot water flowing from the inflow side pipe 30 via the bypass pipe 32 are mixed by the mixing unit 31a, and the mixed hot water is supplied to the hot water tap 1. Therefore, even if the boiling temperature of the hot water in the hot water storage tank 21 is raised, the temperature of the hot water discharged from the hot water tap 1 can be made lower than the temperature of the hot water in the hot water storage tank 21.

[Fifth Embodiment]
Next, the fifth embodiment of the present invention will be described with reference to FIG. Since this embodiment differs from the first embodiment only in a part of the configuration, the same matters as those of the first embodiment will be omitted.

With reference to FIG. 6, in the immediate hot water discharge device 20E of the present embodiment, the mixing valve 52 is assembled to the outflow side pipe 31 instead of the flow rate adjusting valve 33, and the bypass pipe 32 flows out through the mixing valve 52. It is connected to the side pipe 31.

More specifically, the mixing valve 52 is composed of an electric three-way valve or the like, and has two inlet ports 52a and 52b connected to the upstream portion of the outflow side pipe 31 and the bypass pipe 32, respectively. It has one outlet port 52c connected to the downstream portion of the outflow side pipe 31.

Then, the mixing valve 52 mixes hot water supplied from the hot water storage tank 21 (hot water flowing into the inlet port 52a) and hot water supplied from the bypass pipe 32 (hot water flowing into the inlet port 52b). It is possible to supply the pipe from the outlet port 52c to the outflow side pipe 31 on the downstream side (and thus to the hot water tap 1), and it is possible to variably control the mixing ratio thereof. In this case, either one of the inlet ports 52a and 52b is closed (and the flow rate of hot water flowing from the hot water storage tank 21 to the mixing valve 52 or the flow rate of hot water flowing from the bypass pipe 32 to the mixing valve 52 is zero. It is also possible.

Here, the mixing ratio is specifically defined as the flow rate of hot water flowing into the mixing valve 52 from the hot water storage tank 21 (that is, the above-mentioned) among the total flow rate of hot water mixed by the mixing valve 52 and supplied to the hot water tap 1. The flow rate on the tank side) and the flow rate of hot water flowing into the mixing valve 52 from the bypass pipe 32 (that is, the flow rate on the bypass side). Therefore, the mixing ratio corresponds to the bypass ratio, in other words.

The configuration of the immediate hot water discharge device 20E of the present embodiment is the same as that of the immediate hot water discharge device 20A of the first embodiment except for the matters described above. Then, in the present embodiment, the immediate hot water discharge controller 45 is in an operating state (in other words, hot water storage) in which the mixing valve 52 is closed and the inlet port 52a on the hot water storage tank 21 side is closed when the hot water in the hot water storage tank 21 is heated. An operating state in which the flow of hot water from the tank 21 to the outflow side pipe 31 on the downstream side of the mixing valve 52 is blocked) and an operating state in which the inlet port 52b on the bypass pipe 32 side is closed (in other words, the bypass pipe). It is controlled to the operating state of either one of (operating state of blocking the flow of hot water from 32 to the outflow side pipe 31 on the downstream side of the mixing valve 52).

Further, during the hot water discharge operation of the immediate hot water discharge device 20E, the immediate hot water discharge controller 45 determines the target bypass ratio as in the first embodiment, and controls the mixing ratio of the mixing valve 52 according to the target bypass ratio.

The operation control of the immediate hot water discharge device 20E other than the operation control of the mixing valve 52 is the same as that of the immediate hot water discharge device 20A of the first embodiment.

In the immediate hot water discharge device 20E of the present embodiment described above, when the hot water in the hot water storage tank 21 is heated, the mixing valve 52 is provided with the inlet port 52a on the hot water storage tank 21 side and the inlet port 52b on the bypass pipe 32 side as described above. Since one of the inlet ports 52a or 52b is controlled to be in a closed state, the flow path from the hot water storage tank 21 to the expanded water discharge device 37 through the outflow side pipe 31 is blocked by the mixing valve 52. It will be in a state of being. Then, in this state, mainly the hot water (hot water not heated by the heater 22) remaining in the discharge passage 37a on the upstream side of the overpressure relief valve 37b, the inflow side pipe 30, and the bypass pipe 32, and the hot water storage tank 21 The hot water on the lower side, which tends to have a lower temperature than the upper side, is discharged from the discharge path 37a as expansion water from the one close to the overpressure relief valve 37b.

Therefore, similarly to the first embodiment, when the hot water in the hot water storage tank 21 is heated, the loss of heat in the hot water storage tank 21 due to the discharge of the expanded water can be suppressed as much as possible. As a result, the hot water in the hot water storage tank 21 can be efficiently heated.

Further, when the inlet port 52b on the bypass pipe 32 side of the mixing valve 52 is closed when the hot water in the hot water storage tank 21 is heated, the hot water remaining in the outflow side pipe 31 (heated hot water) expands. Since it is also prevented from being discharged as water, it is possible to improve the utilization efficiency of the amount of heat stored in the hot water heated by the heater 22.

In the present embodiment, the expanded water discharge device 37 is, for example, as illustrated by the alternate long and short dash line with the reference numeral 37 (1) in FIG. 6, in the middle portion 30a (bypass pipe 32) of the inflow side pipe 30. It may be connected to a portion on the upstream side of the connection portion with). Alternatively, the expanded water discharge device 37 may be connected to the intermediate portion 30a of the inflow side pipe 30. Alternatively, the expanded water discharge device 37 may be connected to the bypass pipe 32, for example, as illustrated by the alternate long and short dash line with the reference numeral 37 (2) in FIG.

Further, in the embodiment in which the expansion water discharge device 37 is controlled to an operating state in which the inlet port 52a on the hot water storage tank 21 side of the mixing valve 52 is closed when the hot water in the hot water storage tank 21 is heated, the mixing valve 52 is The minimum opening degree of the inlet port 52b on the bypass pipe 32 side may be maintained at an opening degree larger than zero. In this case, even if a problem occurs in which the inlet port 52b on the bypass pipe 32 side of the mixing valve 52 is held at the minimum opening, the hot water storage tank 21 flows out to the outflow side pipe 31. The hot water and the hot water flowing from the inflow side pipe 30 via the bypass pipe 32 are mixed by the mixing valve 52, and the mixed hot water is supplied to the hot water tap 1, as in the first embodiment. Even if the boiling temperature of the hot water in the hot water storage tank 21 is raised, the temperature of the hot water discharged from the hot water tap 1 can be made lower than the temperature of the hot water in the hot water storage tank 21.

Supplementally, in each of the above-described embodiments, the hot water in the hot water storage tank 21 is heated by the heater 22 without passing water to the hot water tap 1. However, the hot water in the hot water storage tank 21 may be heated by the heater 22 not only in the state where the hot water is not flowing to the hot water tap 1 but also in the state where the hot water is being discharged from the hot water tap 1.

In this case, in a state where hot water having a temperature that matches or almost matches the hot water supply target temperature can be supplied from the water heater 3 to the hot water tap 1, the flow rate adjusting 33 in the first embodiment or the second embodiment is closed. Control or control the outlet port 51b on the hot water storage tank 21 side of the distribution valve 51 in the fourth embodiment to be closed, or control the inlet port on the hot water storage tank 21 side of the mixing valve 52 in the fifth embodiment. It is desirable to heat the hot water in the hot water storage tank 21 in a state where the valve closed state of 52a is controlled (in other words, a state in which the inflow of hot water into the hot water storage tank 21 is blocked).

1 ... Hot water tap, 4 ... Heat source machine, 6 ... Hot water supply pipe, 20A, 20B, 20C, 20D, 20E ... Immediate hot water discharge device, 21 ... Hot water storage tank, 22 ... Heater (heating device), 30 ... Inflow side pipe, 30c ... Open end of inflow side pipe, 31 ... Outflow side pipe, 31c ... Open end of outflow side pipe, 32 ... Bypass pipe, 33 ... Flow rate adjustment valve (bypass ratio adjustment valve), 37 ... Expanded water discharge device, 37a ... Discharge passage, 51 ... Distribution valve (bypass ratio adjusting valve), 52 ... Mixing valve (bypass ratio adjusting valve), 45 ... Controller (control device).

Claims (5)

The inflow side pipe connected to the hot water supply pipe so that the hot water heated by the heat source machine is supplied from the heat source machine via the hot water supply pipe, and
A hot water storage tank connected to the inflow side pipe so that hot water can be supplied from the inflow side pipe,
The hot water is connected to the hot water storage tank and the hot water tap so that the hot water in the hot water storage tank can be supplied to the hot water tap, and the hot water is stored at a position above the opening end of the inflow side pipe that opens inside the hot water storage tank. Outflow side piping with an open end that opens inside the tank,
A bypass pipe connected between the inflow side pipe and the outflow side pipe so that hot water can flow from the inflow side pipe to the outflow side pipe without passing through the hot water storage tank.
A heating device that heats the hot water in the hot water storage tank,
The tank side flow rate, which is the flow rate of hot water flowing from the inflow side pipe to the outflow side pipe via the hot water storage tank in the open state of the hot water outlet, and the outflow side from the inflow side pipe through the bypass pipe. The bypass ratio installed in any of the inflow side pipe, the outflow side pipe, and the bypass pipe so that the bypass ratio, which is the ratio of the flow rate of hot water flowing through the pipe to the bypass side flow rate, can be changed. With the regulating valve,
In the hot water storage tank by the heating device, which is connected to any of the inflow side pipe, the outflow side pipe, and the bypass pipe and has a discharge path communicating with the inside of the pipe to be connected. An expanded water discharge device that discharges a part of the expanded water generated by the expanded hot water in the hot water storage tank through the discharge path when the hot water is heated.
It is equipped with a control device that controls the bypass ratio adjusting valve.
The bypass ratio adjusting valve is attached to any of the pipes so as to be located on a flow path from the hot water storage tank to the expanded water discharge device via the outflow side pipe, and the bypass ratio adjustment valve is adjusted. It is configured to shut off the flow path when the valve is controlled to a predetermined operating state.
The control device is an immediate hot water discharge device characterized in that it is configured to control the bypass ratio adjusting valve to the predetermined operating state when the hot water in the hot water storage tank is heated by the heating device. In the immediate hot water discharge device according to claim 1,
The bypass ratio adjusting valve is assembled to the inflow side pipe on the downstream side of the connection portion of the bypass pipe of the inflow side pipe so that the flow rate of hot water flowing into the hot water storage tank from the inflow side pipe can be adjusted. The flow rate adjusting valve is attached, the predetermined operating state of the flow rate adjusting valve is the closed state of the flow rate adjusting valve, and the expanded water discharge device is the inflow on the downstream side of the flow rate adjusting valve. An immediate hot water discharge device characterized by being connected to a side pipe. In the immediate hot water discharge device according to claim 1,
The bypass ratio adjusting valve is assembled to the outflow side pipe on the upstream side of the connection portion of the bypass pipe of the outflow side pipe so that the flow rate of hot water flowing out from the hot water storage tank to the outflow side pipe can be adjusted. The flow rate adjusting valve is attached, the predetermined operating state of the flow rate adjusting valve is the closed state of the flow rate adjusting valve, and the expanded water discharge device is the inflow side pipe, the bypass pipe, or the bypass pipe. An immediate hot water discharge device characterized by being connected to the outflow side pipe on the downstream side of the flow rate adjusting valve. In the immediate hot water discharge device according to claim 1,
The bypass ratio adjusting valve is provided at the connection portion of the bypass pipe of the inflow side pipe, and supplies hot water flowing in from the upstream side of the inflow side pipe to the hot water storage tank on the downstream side of the inflow side pipe. A distribution valve that can be distributed to hot water and hot water supplied to the bypass pipe and whose distribution ratio can be variably controlled, and the predetermined operating state of the distribution valve is an inflow on the upstream side of the distribution valve. It is in an operating state of blocking the flow of hot water from the side pipe to the inflow side pipe on the downstream side of the distribution valve, and the expanded water discharge device is connected to the inflow side pipe on the downstream side of the distribution valve. Immediate hot water discharge device featuring. In the immediate hot water discharge device according to claim 1,
The bypass ratio adjusting valve is provided at the connection portion of the bypass pipe of the outflow side pipe, and mixes hot water flowing in from the hot water storage tank on the upstream side of the outflow side pipe and hot water flowing in from the bypass pipe. It is a mixing valve that can be supplied to the hot water tap and the mixing ratio can be variably controlled, and the predetermined operating state of the mixing valve is the mixing from the outflow side pipe on the upstream side of the mixing valve. An immediate hot water discharge device characterized in that the expansion water discharge device is connected to the inflow side pipe or the bypass pipe, which is an operating state for blocking the flow of hot water to the downstream side of the valve.

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