JP7006482B2 - Hot water storage type hot water supply device - Google Patents

Description

The present invention relates to a hot water storage type hot water supply device.

A hot water storage type hot water supply device having a function of supplying hot water stored in a hot water storage tank to a bathtub or the like is widely used. Medium-warm water that collects in the middle of the hot water storage tank is a factor that reduces boiling efficiency. In order to suppress a decrease in boiling efficiency, there is a hot water storage type hot water supply device equipped with a medium temperature take-out switching valve for taking out medium hot water from the middle part of the hot water storage tank and using it for hot water supply.

Japanese Unexamined Patent Publication No. 2017-133789

When the medium temperature take-out switching valve is switched, the temperature of the hot water supplied to the mixing valve changes, so the hot water supply temperature may fluctuate. At that time, it is not desirable to supply hot water having a temperature higher than the target temperature.

The present invention has been made to solve the above-mentioned problems, and can surely prevent hot water having a temperature higher than the target temperature from being supplied when switching the medium temperature take-out switching valve. The purpose is to provide a type hot water supply device.

The hot water storage type hot water supply device according to the present invention has a heating means for heating water, a hot water storage tank for storing hot water heated by the heating means, a high temperature pipe communicating with the hot water storage tank, and a hot water storage tank at a position lower than the high temperature pipe. A medium-temperature pipe that communicates with the medium-temperature pipe, a medium-temperature inlet into which medium-temperature water, which is hot water supplied from the hot water storage tank, flows in, a low-temperature inlet in which low-temperature water having a lower temperature than the medium-temperature water flows in, and a water outlet. It is supplied from a hot water storage tank through a high temperature pipe and a medium temperature take-out switching valve that can switch the flow path between a medium temperature position that communicates the medium temperature inlet to the water outlet and a low temperature position that communicates the low temperature inlet to the water outlet. The hot water side inlet where hot water, which is hot water, flows in, the water side inlet where water from the water outlet of the medium temperature take-out switching valve flows in, and the high temperature water flowing in from the hot water side inlet and the water flowing in from the water side inlet are mixed. A mixing valve having a hot water outlet for mixing hot water, a medium hot water temperature sensor that detects the medium hot water temperature, and a high temperature water temperature that detects the high temperature water temperature. The control means is provided with a sensor and a control means for controlling the medium temperature take-out switching valve and the mixing valve. Adjust the opening degree to the mixing opening degree, which is the opening degree determined based on the high temperature water temperature and the medium temperature water temperature, and when switching of the medium temperature take-out switching valve is required, the water in the hot water storage tank is used by the heating means. When the boiling operation is being executed, the control means is a hot water storage type hot water supply device that prohibits the switching of the medium temperature take-out switching valve, and from the low temperature position of the medium temperature take-out switching valve during the boiling operation. When switching to the medium temperature position is prohibited and the boiling operation is completed after that, the control means adjusts the opening degree of the mixing valve to the mixing opening degree, and then moves the medium temperature take-out switching valve from the low temperature position to the medium temperature position. It switches to.
Further, the hot water storage type hot water supply device according to the present invention has a heating means for heating water, a hot water storage tank for storing hot water heated by the heating means, a high temperature pipe communicating with the hot water storage tank, and a position lower than the high temperature pipe. A medium-temperature pipe that communicates with the hot water storage tank, a medium-temperature inlet that allows medium-temperature water to flow in, which is hot water supplied from the hot-water storage tank through the medium-temperature pipe, a low-temperature inlet that allows low-temperature water that has a lower temperature than the medium-temperature water to flow in, and a water outlet. A medium-temperature take-out switching valve that can switch the flow path between a medium-temperature position that connects the medium-temperature inlet to the water outlet and a low-temperature position that connects the low-temperature inlet to the water outlet, and a hot water storage tank that supplies the water through a high-temperature pipe. The hot water side inlet into which the hot water that is hot water flows in, the water side inlet in which the water from the water outlet of the medium temperature take-out switching valve flows in, the high temperature water inflowing from the hot water side inlet, and the water flowing in from the water side inlet. A mixing valve with a hot water outlet from which mixed hot water is mixed, a low temperature water temperature sensor that detects the low temperature water temperature that is the temperature of the low temperature water, and a high temperature that detects the high temperature water temperature that is the temperature of the high temperature water. It is equipped with a water temperature sensor and a control means for controlling the medium temperature take-out switching valve and the mixing valve. The opening degree of the mixing valve is adjusted to the mixing opening degree which is the opening degree determined based on the high temperature water temperature and the low temperature water temperature, and when switching of the medium temperature take-out switching valve is required, the hot water storage tank is used by the heating means. When the boiling operation for heating the water in the water is being executed, the control means prohibits the switching of the medium temperature take-out switching valve.
Further, the hot water storage type hot water supply device according to the present invention has a heating means for heating water, a hot water storage tank for storing hot water heated by the heating means, a high temperature pipe communicating with the hot water storage tank, and a position lower than the high temperature pipe. A medium-temperature pipe that communicates with the hot water storage tank, a medium-temperature inlet that allows medium-temperature water to flow in, which is hot water supplied from the hot-water storage tank through the medium-temperature pipe, a low-temperature inlet that allows low-temperature water that has a lower temperature than the medium-temperature water to flow in, and a water outlet. A medium-temperature take-out switching valve that can switch the flow path between a medium-temperature position that connects the medium-temperature inlet to the water outlet and a low-temperature position that connects the low-temperature inlet to the water outlet, and a hot water storage tank that supplies the water through a high-temperature pipe. The hot water side inlet into which the hot water that is hot water flows in, the water side inlet in which the water from the water outlet of the medium temperature take-out switching valve flows in, the high temperature water inflowing from the hot water side inlet, and the water flowing in from the water side inlet. A mixing valve having a hot water outlet for mixed hot water, a medium hot water temperature sensor for detecting the medium hot water temperature, which is the temperature of the medium hot water, and a high temperature for detecting the high temperature water temperature, which is the temperature of the high temperature water. It is equipped with a water temperature sensor and a control means for controlling the medium temperature take-out switching valve and the mixing valve. The opening degree of the mixing valve is adjusted to the mixing opening degree which is the opening degree determined based on the high temperature water temperature and the medium temperature water temperature, and when switching of the medium temperature take-out switching valve is required, the hot water storage tank is used by the heating means. When the boiling operation for heating the water in the water is being executed, the control means is a hot water storage type hot water supply device that prohibits switching of the medium temperature take-out switching valve, and the opening degree of the mixing valve is being adjusted to the mixing opening degree. When the boiling operation is started, the control means returns the opening degree of the mixing valve to the original opening degree.
Further, the hot water storage type hot water supply device according to the present invention has a heating means for heating water, a hot water storage tank for storing hot water heated by the heating means, a high temperature pipe communicating with the hot water storage tank, and a position lower than the high temperature pipe. A medium-temperature pipe that communicates with the hot water storage tank, a medium-temperature inlet that allows medium-temperature water to flow in, which is hot water supplied from the hot-water storage tank through the medium-temperature pipe, a low-temperature inlet that allows low-temperature water that has a lower temperature than the medium-temperature water to flow in, and a water outlet. A medium-temperature take-out switching valve that can switch the flow path between a medium-temperature position that connects the medium-temperature inlet to the water outlet and a low-temperature position that connects the low-temperature inlet to the water outlet, and a hot water storage tank that supplies the water through a high-temperature pipe. The hot water side inlet into which the hot water that is hot water flows in, the water side inlet in which the water from the water outlet of the medium temperature take-out switching valve flows in, the high temperature water inflowing from the hot water side inlet, and the water flowing in from the water side inlet. A mixing valve having a hot water outlet for mixed hot water, a medium hot water temperature sensor for detecting the medium hot water temperature, which is the temperature of the medium hot water, and a high temperature for detecting the high temperature water temperature, which is the temperature of the high temperature water. It is equipped with a water temperature sensor and a control means for controlling the medium temperature take-out switching valve and the mixing valve. The opening degree of the mixing valve is adjusted to the mixing opening degree which is the opening degree determined based on the high temperature water temperature and the medium temperature water temperature, and when switching of the medium temperature take-out switching valve is required, the hot water storage tank is used by the heating means. When the boiling operation for heating the water in the water is being executed, the control means is a hot water storage type hot water supply device that prohibits switching of the medium temperature take-out switching valve, and is a mixing that detects the mixed hot water temperature which is the temperature of the mixed hot water. A hot water temperature sensor is further provided, and the control means stores the opening degree of the mixing valve when the mixed hot water temperature becomes equal to the target temperature as a stable opening degree, and when the switching operation of the medium temperature take-out switching valve and the mixing valve is completed. In addition, the control means discards the information on the stable opening degree.
Further, the hot water storage type hot water supply device according to the present invention has a heating means for heating water, a hot water storage tank for storing hot water heated by the heating means, a high temperature pipe communicating with the hot water storage tank, and a position lower than the high temperature pipe. A medium-temperature pipe that communicates with the hot water storage tank, a medium-temperature inlet that allows medium-temperature water to flow in, which is hot water supplied from the hot-water storage tank through the medium-temperature pipe, a low-temperature inlet that allows low-temperature water that has a lower temperature than the medium-temperature water to flow in, and a water outlet. A medium-temperature take-out switching valve that can switch the flow path between a medium-temperature position that connects the medium-temperature inlet to the water outlet and a low-temperature position that connects the low-temperature inlet to the water outlet, and a hot water storage tank that supplies the water through a high-temperature pipe. The hot water side inlet into which the hot water that is hot water flows in, the water side inlet in which the water from the water outlet of the medium temperature take-out switching valve flows in, the high temperature water inflowing from the hot water side inlet, and the water flowing in from the water side inlet. A mixing valve having a hot water outlet for mixed hot water, a medium hot water temperature sensor for detecting the medium hot water temperature, which is the temperature of the medium hot water, and a high temperature for detecting the high temperature water temperature, which is the temperature of the high temperature water. It is equipped with a water temperature sensor and a control means for controlling the medium temperature take-out switching valve and the mixing valve. The opening degree of the mixing valve is adjusted to the mixing opening degree which is the opening degree determined based on the high temperature water temperature and the medium temperature water temperature, and when switching of the medium temperature take-out switching valve is required, the hot water storage tank is used by the heating means. When the boiling operation for heating the water in the water is being executed, the control means is a hot water storage type hot water supply device that prohibits switching of the medium temperature take-out switching valve, and is controlled during the hot water supply operation from the mixing valve. The means controls if the switching of the medium temperature take-out switching valve is not started even if there is a request to switch the medium temperature take-out switching valve, and the hot water supply operation is started after the opening of the mixing valve is adjusted to the mixing opening. The means is to continuously complete the switching from the low temperature position to the medium temperature position of the medium temperature take-out switching valve.
Further, the hot water storage type hot water supply device according to the present invention has a heating means for heating water, a hot water storage tank for storing hot water heated by the heating means, a high temperature pipe communicating with the hot water storage tank, and a position lower than the high temperature pipe. A medium-temperature pipe that communicates with the hot water storage tank, a medium-temperature inlet that allows medium-temperature water to flow in, which is hot water supplied from the hot-water storage tank through the medium-temperature pipe, a low-temperature inlet that allows low-temperature water that has a lower temperature than the medium-temperature water to flow in, and a water outlet. A medium-temperature take-out switching valve that can switch the flow path between a medium-temperature position that connects the medium-temperature inlet to the water outlet and a low-temperature position that connects the low-temperature inlet to the water outlet, and a hot water storage tank that supplies the water through a high-temperature pipe. The hot water side inlet into which the hot water that is hot water flows in, the water side inlet in which the water from the water outlet of the medium temperature take-out switching valve flows in, the high temperature water inflowing from the hot water side inlet, and the water flowing in from the water side inlet. A mixing valve having a hot water outlet for mixing hot water, a medium hot water temperature sensor for detecting the medium hot water temperature, which is the temperature of the medium hot water, and a high temperature for detecting the high temperature water temperature, which is the temperature of the high temperature water. It is equipped with a water temperature sensor and a control means for controlling the medium temperature take-out switching valve and the mixing valve. The opening degree of the mixing valve is adjusted to the mixing opening degree which is the opening degree determined based on the high temperature water temperature and the medium temperature water temperature, and when switching of the medium temperature take-out switching valve is required, the hot water storage tank is used by the heating means. When the boiling operation for heating the water in the water is being executed, the control means is a hot water storage type hot water supply device that prohibits switching of the medium temperature take-out switching valve, and after switching the medium temperature take-out switching valve, the mixing valve is used. It is further provided with a notification means for notifying information that the hot water supply temperature may fluctuate when the hot water supply operation from the water is first detected.

According to the present invention, it is possible to reliably prevent the supply of hot water having a temperature higher than the target temperature when switching the medium temperature take-out switching valve.

It is a figure which shows the hot water storage type hot water supply apparatus by Embodiment 1. FIG. It is a flowchart which shows the process which a control part performs at the time of switching a medium temperature take-out switching valve from a low temperature position to a medium temperature position. It is a timing chart for demonstrating the control of the comparative example. It is a timing chart for demonstrating the control by Embodiment 1. FIG. It is a flowchart which shows the process which a control part performs at the time of switching a medium temperature take-out switching valve from a medium temperature position to a low temperature position. It is a timing chart for demonstrating the control of the comparative example. It is a timing chart for demonstrating the control by Embodiment 1. FIG. It is a figure which shows the display example of the display part of the remote control for notifying the information that the hot water supply temperature may fluctuate.

Hereinafter, embodiments will be described with reference to the drawings. Common or corresponding elements in the drawings are designated by the same reference numerals to simplify or omit duplicate descriptions.

Embodiment 1.
FIG. 1 is a diagram showing a hot water storage type hot water supply device according to the first embodiment. As shown in FIG. 1, the hot water storage type hot water supply device 35 of the present embodiment includes an HP unit 7 that uses a heat pump cycle that is a refrigeration cycle, a tank unit 33 that has a hot water storage tank 8, and a remote controller 44. The HP unit 7 corresponds to a heating means for heating water. In the illustrated configuration, a control unit 36 corresponding to a control means for controlling the operation of the hot water storage type hot water supply device 35 is built in the tank unit 33.

The remote controller 44 is connected to the control unit 36 of the hot water storage type hot water supply device 35 so that data communication is possible in both directions. The remote controller 44 is an example of a user interface. The communication between the control unit 36 and the remote controller 44 may be wired communication or wireless communication. The remote controller 44 may be installed in the bathroom. The remote control 44 may be installed in the kitchen. A plurality of remote controllers 44 may be installed at different locations. In addition to the remote controller 44, a portable information terminal such as a smartphone may be used as a user interface of the hot water storage type hot water supply device 35.

The remote controller 44 includes a display unit 44a, an operation unit 44b, and a sound generation unit 44c. The display unit 44a may be, for example, a liquid crystal display or an organic EL display. The display unit 44a can display, for example, information on the state of the hot water storage type hot water supply device 35, information on the setting contents of the hot water storage type hot water supply device 35, and the like. The operation unit 44b may include buttons, dials, keys and the like for the user to operate. The display unit 44a may be a touch screen having the function of an operation unit. The sound generation unit 44c is provided with a speaker, and can generate sound (including voice) for notifying information. The display unit 44a and the sound generation unit 44c correspond to the notification means. The user can change the setting of the hot water supply temperature by operating the operation unit 44b. The set hot water supply temperature value is displayed on the display unit 44a. In the following description, the hot water supply temperature set by the user is referred to as "target temperature".

The HP unit 7 and the tank unit 33 are connected to each other via an HP going pipe 14, an HP return pipe 15, and an electrical wiring (not shown). The operation of various actuators such as valves and pumps included in the tank unit 33 and the HP unit 7 is controlled by a control unit 36 electrically connected to these actuators.

The HP unit 7 includes a refrigerating cycle using a refrigerant circuit in which a compressor 2, a water refrigerant heat exchanger 3, an expansion valve 4, and an air heat exchanger 6 are annularly connected by a refrigerant pipe 5. The water-refrigerant heat exchanger 3 is a heat exchanger that exchanges heat between the high-temperature and high-pressure refrigerant compressed by the compressor 2 and the water guided from the tank unit 33. The hot water storage type hot water supply device 35 can carry out a boiling operation. The boiling operation is an operation in which the water in the hot water storage tank 8 is heated by the HP unit 7. The air heat exchanger 6 is a heat exchanger that absorbs the heat of the atmosphere into a low-pressure refrigerant. The HP unit 7 may include a blower (not shown) that blows outside air to the air heat exchanger 6.

The tank unit 33 contains the following various parts, pipes, and the like. The hot water storage tank 8 is for storing hot water. Due to the difference in water density depending on the temperature, a temperature stratification with a high temperature on the upper side and a low temperature on the lower side can be formed in the hot water storage tank 8. A third water supply pipe 9c is connected to the water introduction port 8a provided at the bottom of the hot water storage tank 8. The water supplied from a water source such as tap water is adjusted to a predetermined pressure by the pressure reducing valve 31 and then flows into the hot water storage tank 8 through the third water supply pipe 9c. A hot water supply pipe 13 and a high temperature pipe 21 are connected to the hot water introduction outlet 8d provided in the upper part of the hot water storage tank 8. The hot water supply pipe 13 and the high temperature pipe 21 communicate with the hot water storage tank 8 at the hot water introduction outlet 8d. The hot water storage tank 8 is not limited to a single tank as shown in the figure, but may include a plurality of tanks connected in series via a pipe. In the following description, the height direction, that is, the vertical direction position in the hot water storage tank 8 will be referred to, but when the hot water storage tank 8 includes a plurality of tanks connected in series, the highest tank to the lowest tank 8 are provided. The vertical position shall be specified in the entire hierarchy up to the tank.

In the boiling operation, the hot water heated by the HP unit 7 flows into the hot water storage tank 8 from the hot water introduction outlet 8d, and the hot water is gradually accumulated in the hot water storage tank 8 from top to bottom. go. A plurality of hot water storage temperature sensors 42, 43, 52 are attached to the surface of the hot water storage tank 8 at different heights. The control unit 36 can detect the amount of hot water stored and the amount of heat stored in the hot water storage tank 8 by detecting the temperature distribution of the hot water in the hot water storage tank 8 with the hot water storage temperature sensors 42, 43, 52. The control unit 36 may control the start and stop of the boiling operation according to the detected amount of hot water stored or the amount of heat stored in the hot water storage tank 8. In the illustrated example, three hot water storage temperature sensors 42, 43, 52 are provided, but more hot water storage temperature sensors may be provided.

A circulation pump 12 and a bath heat exchanger 20 are built in the tank unit 33. The circulation pump 12 is a pump for circulating hot water in various pipes, and is provided on the HP going pipe 14. The bath heat exchanger 20 is a heat exchanger for heating the water to be heated (bathtub water, heating water, etc.) on the secondary side by using the high temperature hot water supplied from the hot water storage tank 8 or the HP unit 7. Is. In the present embodiment, as a configuration on the secondary side of the bath heat exchanger 20, a bath going pipe 27 and a bath returning pipe 28 for circulating hot water in the bathtub 30 will be illustrated and described. The bath heat exchanger 20 is installed in the middle of the bath going pipe 27 and the bath returning pipe 28. Further, in the middle of the bath going pipe 27 and the bath returning pipe 28, a bath circulation pump 29 for circulating bathtub water, a bath returning temperature sensor 38 for detecting the temperature of the bathtub water coming out of the bathtub 30, and a bath returning temperature sensor 38. A bath going temperature sensor 37 for detecting the temperature of the hot water after the heat exchange from the bath heat exchanger 20 is installed.

The three-way valve 11 is a flow path switching means having an a port and a b port into which hot water flows in and a c port in which hot water flows out. The four-way valve 18 is a flow path switching means having a b port and a c port into which hot water flows in and an a port and a d port in which hot water flows out, and has four routes, ab, ac, and bd. , Cd is configured so that the flow path can be switched. Further, the tank unit 33 has a water outlet pipe 10, a hot water introduction pipe 20a, a first bypass pipe 16, a hot water outlet pipe 20b, and a second bypass pipe 17. The water outlet pipe 10 connects the water outlet 8b provided at the lower part of the hot water storage tank 8 to the a port of the three-way valve 11. The HP going pipe 14 connects the c port of the three-way valve 11 to the inlet side of the HP unit 7. The HP return pipe 15 connects the outlet side of the HP unit 7 and the c port of the four-way valve 18. The hot water supply pipe 13 connects the d port of the four-way valve 18 and the hot water introduction outlet 8d on the upper part of the hot water storage tank 8. The first bypass pipe 16 connects the a port of the four-way valve 18 and the hot water introduction port 8c provided between the central portion and the lower portion of the hot water storage tank 8. The hot water introduction pipe 20a branches from the middle of the hot water supply pipe 13 and is connected to the primary side inlet of the bath heat exchanger 20. The hot water outlet pipe 20b connects the primary side outlet of the bath heat exchanger 20 and the b port of the three-way valve 11. The second bypass pipe 17 branches from between the circulation pump 12 in the HP outbound pipe 14 and the inlet side of the HP unit 7, and is connected to the b port of the four-way valve 18.

Further, the tank unit 33 includes a first water supply pipe 9a, a second water supply pipe 9b, a third water supply pipe 9c, a medium temperature pipe 51, a medium temperature take-out switching valve 53, a hot water supply mixing valve 22, a bath mixing valve 23, and a first hot water supply. It has a pipe 24 and a second hot water supply pipe 25. The medium temperature take-out switching valve 53 is a flow path switching means having a medium temperature inlet 53a, a low temperature inlet 53b, and a water outlet 53c. The medium temperature pipe 51 connects the medium temperature water outlet 8e provided in the middle portion in the height direction of the hot water storage tank 8 and the medium temperature inlet 53a. The medium temperature pipe 51 communicates with the hot water storage tank 8 at a position lower than the high temperature pipe 21, that is, at a position of the medium temperature water outlet 8e. In the following description, hot water supplied from the hot water storage tank 8 through the medium temperature pipe 51 is referred to as “medium hot water”. The name "medium hot water" is for convenience only and does not limit the temperature range.

The hot water supply mixing valve 22 and the bath mixing valve 23 have a hot water side inlet, a water side inlet, and an outlet, respectively. The high temperature pipe 21 branches from the middle and is connected to the hot water side inlet of the hot water supply mixing valve 22 and the bath mixing valve 23, respectively.

One end of the first water supply pipe 9a is connected to a water source such as water supply. The other end of the first water supply pipe 9a is connected to the low temperature inlet 53b via the pressure reducing valve 31. One end of the second water supply pipe 9b is connected to the water outlet 53c. The other end of the second water supply pipe 9b branches from the middle and is connected to the water side inlets of the hot water supply mixing valve 22 and the bath mixing valve 23, respectively. The third water supply pipe 9c branched from between the pressure reducing valve 31 and the low temperature inlet 53b is connected to a water introduction port 8a provided at the lower part of the hot water storage tank 8.

In the middle of the second hot water supply pipe 25, a bath solenoid valve 26 for opening and closing the second hot water supply pipe 25 and a bath flow rate sensor 45 for detecting the flow rate of hot water passing through the second hot water supply pipe 25 are provided. The water supply temperature sensor 49 provided in the first water supply pipe 9a detects the temperature of the low temperature water supplied from the water source. In the following description, the temperature detected by the water supply temperature sensor 49 is referred to as "low temperature water temperature". The water supply temperature sensor 49 corresponds to a low temperature water temperature sensor.

The medium temperature take-out switching valve 53 can switch the flow path between a medium temperature position in which the medium temperature inlet 53a communicates with the water outlet 53c and a low temperature position in which the low temperature inlet 53b communicates with the water outlet 53c. When the medium temperature take-out switching valve 53 is in the medium temperature position, the medium temperature water supplied from the hot water storage tank 8 through the medium temperature pipe 51 flows into the water side inlets of the hot water supply mixing valve 22 and the bath mixing valve 23. When the medium temperature take-out switching valve 53 is in the low temperature position, the low temperature water from the water source flows into the water side inlet of the hot water supply mixing valve 22 and the bath mixing valve 23.

The hot water supply mixing valve 22 and the bath mixing valve 23 mix the high temperature water supplied from the high temperature pipe 21 with the medium or low temperature water supplied from the second water supply pipe 9b, and mix the mixed hot water. It flows into the first hot water supply pipe 24 and the second hot water supply pipe 25, respectively. The hot water whose temperature has been adjusted by the hot water supply mixing valve 22 is supplied from the first hot water supply pipe 24 to the first hot water supply destination (not shown) via the hot water supply tap 34. The first hot water supply destination may be, for example, a faucet such as a shower or a curan. The hot water supply flow rate sensor 46 and the hot water supply temperature sensor 47 are installed in the first hot water supply pipe 24. The hot water whose temperature has been adjusted by the bath mixing valve 23 is supplied from the second hot water supply pipe 25 to the bathtub 30, which is the second hot water supply destination, via the bath going pipe 27 and the bath returning pipe 28.

The hot water supply temperature sensor 47 corresponds to a mixed hot water temperature sensor that detects the mixed hot water temperature, which is the temperature of the mixed hot water mixed by the hot water supply mixing valve 22. In the following description, the temperature detected by the hot water supply temperature sensor 47 is referred to as “hot water supply temperature”. When hot water is supplied from the hot water supply mixing valve 22, the control unit 36 changes the opening degree of the hot water supply mixing valve 22 so that the hot water supply temperature detected by the hot water supply temperature sensor 47 becomes equal to the target temperature, so that the hot water can be mixed. , Adjust the flow ratio to medium temperature water or low temperature water. Further, when supplying hot water to the bathtub 30, the control unit 36 changes the opening degree of the bath mixing valve 23 so that the temperature detected by the bath going temperature sensor 37 or the bath returning temperature sensor 38 becomes equal to the target temperature. By doing so, the flow ratio between the high temperature water and the medium temperature water or the low temperature water is adjusted.

The three-way valve 11 has two flow path forms, one in which the water outlet pipe 10 and the HP outbound pipe 14 communicate with each other, and the other in which the hot water outlet pipe 20b and the HP outbound pipe 14 communicate with each other. Use by switching the flow path of hot water. The four-way valve 18 has a form in which the HP return pipe 15 and the hot water supply pipe 13 communicate with each other, a form in which the HP return pipe 15 and the first bypass pipe 16 communicate with each other, and the first bypass pipe 16 and the second bypass pipe 17 communicate with each other. The hot water flow path in the tank unit 33 is switched and used in four flow path forms, that is, a form in which the hot water supply pipe 13 and the second bypass pipe 17 communicate with each other.

At the time of boiling operation, it becomes as follows. The HP unit 7 and the circulation pump 12 are operated. The water in the lower part of the hot water storage tank 8 flows into the water refrigerant heat exchanger 3 through the water outlet port 8b, the water outlet pipe 10, the three-way valve 11, the circulation pump 12, and the HP outbound pipe 14. The high-temperature and high-pressure refrigerant compressed by the compressor 2 flows into the water-refrigerant heat exchanger 3. The hot water heated in the water refrigerant heat exchanger 3 flows into the hot water storage tank 8 from the hot water introduction outlet 8d through the HP return pipe 15, the four-way valve 18, and the hot water supply pipe 13. The high-pressure refrigerant that has passed through the water-refrigerant heat exchanger 3 is expanded and depressurized by the expansion valve 4 to become a gas-liquid two-phase low-pressure refrigerant. This low-pressure refrigerant evaporates and vaporizes by absorbing the heat of the atmosphere in the air heat exchanger 6. This vaporized low-pressure refrigerant is sucked into the compressor 2.

The hot water storage temperature sensor 52 is located at substantially the same height as the medium-temperature water outlet 8e. Therefore, it is considered that the temperature of the medium-temperature water supplied from the medium-temperature pipe 51 is equal to the temperature detected by the hot water storage temperature sensor 52. In the following description, the temperature detected by the hot water storage temperature sensor 52 is referred to as "medium hot water temperature". The hot water storage temperature sensor 52 in the present embodiment corresponds to a medium hot water temperature sensor.

The hot water storage temperature sensor 42 is located on the upper part of the hot water storage tank 8. Therefore, it is considered that the temperature of the high temperature water supplied from the high temperature pipe 21 is equal to the temperature detected by the hot water storage temperature sensor 42. In the following description, the temperature detected by the hot water storage temperature sensor 42 is referred to as "high temperature water temperature". The hot water storage temperature sensor 42 in the present embodiment corresponds to a high temperature water temperature sensor.

FIG. 2 is a flowchart showing a process performed by the control unit 36 when switching the medium temperature take-out switching valve 53 from the low temperature position to the medium temperature position. Step S1 of FIG. 2 shows that the medium temperature take-out switching valve 53 is in the low temperature position in the initial state of this flowchart. In this state, when the user opens the shower, faucet, etc., the low-temperature water from the first water supply pipe 9a flows into the second water supply pipe 9b, and the high-temperature water from the high-temperature pipe 21 is connected to the hot water supply mixing valve 22. It is in a state of being mixed. The control unit 36 adjusts the flow rate ratio, that is, the mixing ratio in the hot water supply mixing valve 22, so that the hot water supply temperature becomes equal to the target temperature. The control unit 36 stores the opening degree of the hot water supply mixing valve 22 when the hot water supply temperature becomes equal to the target temperature as a stable opening degree. By memorizing the stable opening, the hot water of the target temperature can be quickly supplied the next time the hot water is supplied.

From step S1 to step S2, the control unit 36 determines whether or not the medium temperature water temperature detected by the hot water storage temperature sensor 52 is lower than the target temperature. If the medium temperature take-out switching valve 53 is set to the medium temperature position when the medium temperature water temperature is higher than the target temperature, the hot water supply temperature will be higher than the target temperature even if the opening degree of the hot water supply mixing valve 22 is fully opened on the water side. In order to avoid such a situation, when the medium temperature water temperature is higher than the target temperature, the current process of this flowchart is terminated without switching the medium temperature take-out switching valve 53.

If the medium temperature water temperature is lower than the target temperature, the process proceeds to step S3. In step S3, it is determined whether or not the hot water supply operation from the hot water supply mixing valve 22 is being executed and whether or not the boiling operation is being executed. If the medium temperature take-out switching valve 53 is switched during the hot water supply operation, the hot water supply temperature fluctuates. In order to avoid such a situation, when the hot water supply operation is being executed, the current process of this flowchart is terminated without switching the medium temperature take-out switching valve 53. Further, during the boiling operation, the amount of high-temperature water in the hot water storage tank 8 increases, so that the medium-temperature water temperature detected by the hot water storage temperature sensor 52 rises at a certain timing. If the medium temperature water temperature rises while the medium temperature take-out switching valve 53 is being switched, the hot water supply temperature may rise suddenly. In order to avoid such a situation, when the boiling operation is being executed, the control unit 36 prohibits the switching of the medium temperature take-out switching valve 53, and ends the current process of this flowchart without switching. ..

If neither the hot water supply operation nor the boiling operation is being executed in step S3, the process proceeds to step S4. In step S4, the control unit 36 determines whether a predetermined time (for example, 30 minutes) or more has elapsed since the medium temperature take-out switching valve 53 was switched to the low temperature position. When the medium temperature take-out switching valve 53 is switched, the hot water supply temperature may fluctuate. Therefore, if the timing of switching the medium temperature take-out switching valve 53 frequently overlaps with the timing of the user using hot water, the user may feel uncomfortable. In order to avoid such a situation, if a predetermined time has not passed since the medium temperature take-out switching valve 53 was switched to the low temperature position, the current process of this flowchart is performed without switching the medium temperature take-out switching valve 53. finish. It is desirable that the predetermined time is set according to the average usage time of one time when the user uses hot water. By doing so, it is possible to prevent the frequency of switching of the medium temperature take-out switching valve 53 from increasing, so that it is possible to more reliably prevent the user from feeling uncomfortable.

If a predetermined time or more has elapsed since the medium temperature take-out switching valve 53 was switched to the low temperature position, the process proceeds to step S5. In step S5, the control unit 36 changes the opening degree of the hot water supply mixing valve 22 before switching the medium temperature take-out switching valve 53. When the medium temperature take-out switching valve 53 is in the low temperature position, the high temperature water supplied from the high temperature pipe 21 (hereinafter referred to as 80 ° C.) and the low temperature water supplied from the second water supply pipe 9b (hereinafter referred to as 10 ° C. as an example). Is mixed by the hot water supply mixing valve 22. Assuming that the target temperature is 45 ° C., if the mixing ratio of the high temperature water and the low temperature water is 1: 1, the hot water supply temperature becomes 45 ° C., which is the target temperature. In this case, the control unit 36 sets the opening degree of the hot water supply mixing valve 22 so that the mixing ratio of the high temperature water and the low temperature water becomes 1: 1 and makes the hot water supply mixing valve 22 stand by. As a result, hot water can be supplied at a temperature close to the target temperature immediately after the start of hot water supply.

When the medium temperature take-out switching valve 53 is switched from the low temperature position to the medium temperature position, the high temperature water of 80 ° C. and the medium temperature water supplied from the medium temperature pipe 51 (hereinafter, 30 ° C. as an example) are mixed by the hot water supply mixing valve 22. To. In the present embodiment, when switching the medium temperature take-out switching valve 53 from the low temperature position to the medium temperature position, the control unit 36 sets the opening degree of the hot water supply mixing valve 22 to high temperature water before switching the medium temperature take-out switching valve 53. Adjust to the mixing opening, which is the opening determined based on the temperature, medium hot water temperature, and target temperature. Explaining with the above numerical example, when the mixing ratio of the high temperature water of 80 ° C. and the medium temperature water of 30 ° C. is 3: 7, the hot water supply temperature becomes 45 ° C., which is the target temperature. In this case, the control unit 36 adjusts the opening degree of the hot water supply mixing valve 22 to a mixing opening degree such that the mixing ratio of the high temperature water and the medium hot water is 3: 7, and waits for the hot water supply mixing valve 22. Let me. As a result, hot water can be supplied at a temperature close to the target temperature immediately after the start of hot water supply.

FIG. 3 is a timing chart for explaining the control of the comparative example. In this comparative example, the medium temperature take-out switching valve 53 is switched from the low temperature position to the medium temperature position from time t1 to time t2 before adjusting the opening degree of the hot water supply mixing valve 22. It is assumed that the hot water supply operation is started at time t2. In FIG. 3, the "water opening" corresponds to the opening of the hot water mixing valve 22 at which the hot water supply temperature becomes equal to the target temperature when the medium temperature take-out switching valve 53 is in the low temperature position, and is the "medium temperature opening". Corresponds to the opening degree of the hot water supply mixing valve 22 in which the hot water supply temperature becomes equal to the target temperature when the medium temperature take-out switching valve 53 is in the medium temperature position. At time t2, the opening degree of the hot water supply mixing valve 22 is the opening degree for water, so that the hot water at 80 ° C. and the medium temperature water at 30 ° C. are mixed in the hot water supply mixing valve 22 at a ratio of, for example, 1: 1. Hot water that is mixed and has a temperature higher than the target temperature (55 ° C. in the above numerical example) is supplied from the hot water supply mixing valve 22. When the opening degree of the hot water supply mixing valve 22 is adjusted from the water opening degree to the medium temperature opening degree from time t2 to time t3, the hot water supply temperature drops and becomes equal to the target temperature. As described above, in the case of the comparative example, hot water having a temperature higher than the target temperature may be supplied from the hot water supply mixing valve 22. Such a situation is not preferable.

FIG. 4 is a timing chart for explaining the control according to the first embodiment. In the present embodiment, before switching the medium temperature take-out switching valve 53 from the low temperature position to the medium temperature position, the opening degree of the hot water supply mixing valve 22 is changed from the water opening degree to the medium temperature opening degree, that is, from time t1 to time t2. Adjust to the opening. As a result, the opening degree of the hot water supply mixing valve 22 becomes an opening degree in which the flow rate ratio between the hot water side inlet and the water side inlet is, for example, 3: 7. It is assumed that the hot water supply operation is started at time t2. At time t2, the medium temperature take-out switching valve 53 is still in the low temperature position, so the high temperature water at 80 ° C. and the low temperature water at 10 ° C. are mixed by the hot water supply mixing valve 22 at a ratio of 3: 7, and the target temperature is reached. Hot water having a lower temperature (31 ° C. in the above numerical example) is supplied from the hot water supply mixing valve 22. When the opening degree of the hot water supply mixing valve 22 is adjusted from the medium temperature opening degree to the water opening degree from time t2 to time t3, the hot water supply temperature rises and becomes equal to the target temperature. As described above, in the present embodiment, even if the hot water supply operation is started in the middle of the process of switching the medium temperature take-out switching valve 53, hot water having a temperature higher than the target temperature is supplied from the hot water supply mixing valve 22. You can surely prevent it from happening.

The explanation will be continued by returning to the flowchart of FIG. After starting the driving of the hot water supply mixing valve 22 in step S5, the process proceeds to step S6, and the control unit 36 determines whether or not the opening degree change of the hot water supply mixing valve 22 is completed. When the change in the opening degree of the hot water supply mixing valve 22 is completed, the process proceeds to step S9, and when the hot water supply mixing valve 22 is still being driven, the process proceeds to step S7.

In step S7, the control unit 36 determines whether the boiling operation or the hot water supply operation has been started. As described above, since the medium temperature water temperature may rise during the boiling operation, the hot water supply temperature may be higher than the target temperature at the opening degree of the hot water supply mixing valve 22 calculated in advance. .. Further, if the hot water supply operation is performed, the hot water supply temperature may fluctuate. In order to avoid such a situation, when the boiling operation or the hot water supply operation is started, the process proceeds to step S8, and the switching process of the series of hot water supply mixing valve 22 and the medium temperature take-out switching valve 53 is stopped. That is, in step S8, the control unit 36 returns the opening degree of the hot water supply mixing valve 22 to the original opening degree for water. Further, in step S8, when the control unit 36 stores in step S1 the stable opening degree of the hot water supply mixing valve 22 when the medium temperature take-out switching valve 53 is in the low temperature position, the control unit 36 stabilizes the hot water supply mixing valve 22. You may return to the opening.

As described above, in the present embodiment, when the boiling operation is started while adjusting the opening degree of the hot water supply mixing valve 22 to the mixing opening degree, the control unit 36 controls the opening degree of the hot water supply mixing valve 22. To return to the original opening. This makes it possible to more reliably prevent the occurrence of high-temperature hot water supply. Further, when the control unit 36 stores the stable opening degree and the boiling operation is started while adjusting the opening degree of the hot water supply mixing valve 22 to the mixing opening degree, the control unit 36 controls the hot water supply unit 36. The water heater 22 is returned to a stable opening. As a result, the hot water supply temperature can be quickly matched to the target temperature at the next hot water supply.

In step S9, the control unit 36 starts switching from the low temperature position to the medium temperature position of the medium temperature take-out switching valve 53, and proceeds to step S10. In step S10, the control unit 36 determines whether or not the switching from the low temperature position to the medium temperature position of the medium temperature take-out switching valve 53 is completed, and if the switching is completed, the current process of this flowchart ends. When the stable opening degree of the hot water supply mixing valve 22 is stored in step S1 and the switching of the medium temperature take-out switching valve 53 is completed, the control unit 36 has the stored stable opening degree. Discard the information from memory. This is because when the switching of the medium temperature take-out switching valve 53 is completed, the stable opening degree of the hot water supply mixing valve 22 becomes a different opening degree.

If the switching of the medium temperature take-out switching valve 53 has not been completed in step S10, the process proceeds to step S11, and the control unit 36 determines whether the boiling operation or the hot water supply operation has been started. As described above, since the temperature of the medium-temperature water may rise during the boiling operation, the hot water supply temperature may be higher than the target temperature when the medium-temperature water is used. Further, if the hot water supply operation is performed, the hot water supply temperature may fluctuate. In order to avoid such a situation, when the boiling operation or the hot water supply operation is started, the switching process of the series of hot water supply mixing valve 22 and the medium temperature take-out switching valve 53 is stopped. That is, the process proceeds from step S11 to step S12, and the control unit 36 returns the medium temperature take-out switching valve 53 from the medium temperature position to the low temperature position. Further, the process proceeds to step S8, and the control unit 36 returns the opening degree of the hot water supply mixing valve 22 to the original opening degree for water. Further, in step S8, when the control unit 36 stores in step S1 the stable opening degree of the hot water supply mixing valve 22 when the medium temperature take-out switching valve 53 is in the low temperature position, the control unit 36 stabilizes the hot water supply mixing valve 22. You may return to the opening.

When switching from the low temperature position to the medium temperature position of the medium temperature take-out switching valve 53 is prohibited during the boiling operation, and then the boiling operation is completed, the control unit 36 opens the hot water supply mixing valve 22. After adjusting the degree to the mixing opening degree, the medium temperature take-out switching valve 53 may be switched from the low temperature position to the medium temperature position. As a result, the switching of the medium temperature take-out switching valve 53 can be completed immediately after the end of the boiling operation.

In the present embodiment, during the hot water supply operation from the hot water supply mixing valve 22, the control unit 36 does not start switching the medium temperature take-out switching valve 53 even if there is a request for switching the medium temperature take-out switching valve 53. As a result, fluctuations in the hot water supply temperature can be reliably avoided. Further, in the above-mentioned flowchart, when the hot water supply operation is started after the opening degree of the hot water supply mixing valve 22 is adjusted to the mixing opening degree, the control unit 36 causes the medium temperature take-out switching valve 53 to return to the low temperature position. ing. As a modification to this, when the hot water supply operation is started after the opening degree of the hot water supply mixing valve 22 is adjusted to the mixing opening degree, the control unit 36 moves from the low temperature position to the medium temperature position of the medium temperature take-out switching valve 53. You may want to continue to complete the switch. This is because if the opening degree of the hot water supply mixing valve 22 is adjusted to the mixing opening degree, it is unlikely that high temperature hot water supply will occur even if the medium temperature take-out switching valve 53 is not returned to the low temperature position.

FIG. 5 is a flowchart showing a process performed by the control unit 36 when switching the medium temperature take-out switching valve 53 from the medium temperature position to the low temperature position. Step S101 of FIG. 5 shows that the medium temperature take-out switching valve 53 is in the medium temperature position in the initial state of this flowchart. In this state, when the user opens the shower, faucet, etc., the medium-temperature water supplied from the hot water storage tank 8 through the medium-temperature pipe 51 flows into the second water supply pipe 9b, and the high-temperature pipe is used in the hot water supply mixing valve 22. It is in a state of being mixed with the high temperature water from 21.

From step S101 to step S102, the control unit 36 determines whether or not the medium temperature water temperature detected by the hot water storage temperature sensor 52 is higher than the target temperature. If the medium temperature take-out switching valve 53 is in the medium temperature position when the medium temperature water temperature is higher than the target temperature, the hot water supply temperature will be higher than the target temperature even if the opening degree of the hot water supply mixing valve 22 is fully opened on the water side. Therefore, when the medium temperature water temperature is higher than the target temperature, it is necessary to switch the medium temperature take-out switching valve 53 from the medium temperature position to the low temperature position, so the process proceeds to step S103. If this is not the case, it is not necessary to switch the medium temperature take-out switching valve 53, so that the current process of this flowchart ends without switching the medium temperature take-out switching valve 53.

In step S103, the control unit 36 determines whether or not the hot water supply operation from the hot water supply mixing valve 22 is being executed and whether or not the boiling operation is being executed. If the medium temperature take-out switching valve 53 is switched during the hot water supply operation, the hot water supply temperature may fluctuate. In order to avoid such a situation, when the hot water supply operation is being executed, the current process of this flowchart is terminated without switching the medium temperature take-out switching valve 53. Further, even when the boiling operation is being executed, the current process of this flowchart is terminated without switching the medium temperature take-out switching valve 53.

If neither the hot water supply operation nor the boiling operation is being executed in step S103, the process proceeds to step S104. In the present embodiment, the control unit 36 switches the medium temperature take-out switching valve 53 before adjusting the opening degree of the hot water supply mixing valve 22. In step S104, the control unit 36 starts switching from the medium temperature position to the low temperature position of the medium temperature take-out switching valve 53, and proceeds to step S105. In step S105, the control unit 36 determines whether or not the switching from the medium temperature position to the low temperature position of the medium temperature take-out switching valve 53 is completed. If the switching is not completed, the process of step S105 is repeated, and if the switching is completed, the process proceeds to step S106.

In step S106, the control unit 36 starts adjusting the opening degree of the hot water supply mixing valve 22 and proceeds to step S107. The control unit 36 adjusts the opening degree of the hot water supply mixing valve 22 to a mixing opening degree which is an opening degree determined based on the high temperature water temperature, the low temperature water temperature, and the target temperature. In step S107, the control unit 36 determines whether or not the process of changing the opening degree of the hot water supply mixing valve 22 to this mixing opening degree is completed. If the opening change process is not completed, the process of step S107 is repeated, and if the opening change process is completed, the current process of this flowchart is terminated.

When the medium temperature take-out switching valve 53 is in the medium temperature position, the control unit 36 adjusts the opening degree of the hot water supply mixing valve 22 to an opening degree determined based on the high temperature water temperature, the medium temperature water temperature, and the target temperature. The hot water supply mixing valve 22 is made to stand by. For example, in the case of the above-mentioned numerical example, the hot water supply mixing valve 22 is made to stand by at an opening degree such that the mixing ratio of the high temperature water at 80 ° C. and the medium temperature water at 30 ° C. is 3: 7. As a result, hot water can be supplied at a hot water supply temperature close to the target temperature (for example, 45 ° C.) immediately after the start of hot water supply.

FIG. 6 is a timing chart for explaining the control of the comparative example. In this comparative example, before switching the medium temperature take-out switching valve 53 from the medium temperature position to the low temperature position, the opening degree of the hot water supply mixing valve 22 is changed from the medium temperature opening degree to the water opening degree from time t1 to time t2. As an example, it is assumed that the opening degree for water is an opening degree having a mixing ratio of 1: 1. It is assumed that the hot water supply operation is started at time t2. At time t2, the medium temperature take-out switching valve 53 is still in the medium temperature position, so high temperature water at 80 ° C. and medium temperature water at 30 ° C. are mixed at a ratio of 1: 1 by the hot water supply mixing valve 22, and the target temperature is reached. Hot water having a higher temperature (55 ° C. in the above numerical example) is supplied from the hot water supply mixing valve 22. When the medium temperature take-out switching valve 53 switches from the medium temperature position to the low temperature position from time t2 to time t3, the hot water supply temperature drops and becomes equal to the target temperature. As described above, in the case of the comparative example, hot water having a temperature higher than the target temperature may be supplied from the hot water supply mixing valve 22. Such a situation is not preferable.

FIG. 7 is a timing chart for explaining the control according to the first embodiment. In the present embodiment, the control unit 36 first switches the medium temperature take-out switching valve 53 from the medium temperature position to the low temperature position from the time t1 to the time t2. After that, the control unit 36 adjusts the opening degree of the hot water supply mixing valve 22 from the medium temperature opening degree to the water opening degree, that is, the mixing opening degree from time t2 to time t3. It is assumed that the hot water supply operation is started at time t2. At time t2, the hot water supply mixing valve 22 has a medium temperature opening having a mixing ratio of, for example, 3: 7, and the medium temperature take-out switching valve 53 is in the low temperature position. Water is mixed with the hot water supply mixing valve 22 at a ratio of 3: 7, and hot water having a temperature lower than the target temperature (31 ° C. in the above numerical example) is supplied from the hot water supply mixing valve 22. When the opening degree of the hot water supply mixing valve 22 is adjusted from the medium temperature opening degree to the water opening degree from time t2 to time t3, the hot water supply temperature rises and becomes equal to the target temperature. As described above, in the present embodiment, even if the hot water supply operation is started in the middle of the process of switching the medium temperature take-out switching valve 53, hot water having a temperature higher than the target temperature is supplied from the hot water supply mixing valve 22. You can surely prevent it from happening.

In the hot water storage type hot water supply device 35 of the present embodiment, after switching the medium temperature take-out switching valve 53, the hot water supply temperature may fluctuate when the hot water supply operation from the hot water supply mixing valve 22 is first detected. It is provided with a notification means for notifying the information. FIG. 8 is a diagram showing a display example of the display unit 44a of the remote controller 44 for notifying information that the hot water supply temperature may fluctuate. In the example shown in FIG. 8, the phrase "the hot water supply temperature may fluctuate" is displayed on the display unit 44a. The phrase may be guided by voice from the sound generation unit 44c. By performing the above notification, the user can know that the rare fluctuation of the hot water supply temperature is not due to the failure of the device, and the device can be used with peace of mind.

Although the embodiments have been described above, the present invention is not limited to the embodiments as described above. For example, in the first embodiment, it is determined in steps S3, S7, and S11 whether or not the hot water supply operation and the boiling operation are performed, but in addition to this, the hot water filling operation to the bathtub 30 or the hot water filling operation is performed. It may be determined whether or not there is an operation related to bath hot water supply such as reheating operation of the bathtub 30. As a result, it is possible to avoid high-temperature hot water supply to the bathtub 30 as well as the shower or the faucet.

2 Compressor, 3 Water refrigerant heat exchanger, 4 Expansion valve, 5 Refrigerator pipe, 6 Air heat exchanger, 7 HP unit, 8 Hot water storage tank, 8a Water inlet, 8b Water outlet, 8c Hot water inlet, 8d Hot water Introductory outlet, 8e medium temperature water outlet, 9a 1st water supply pipe, 9b 2nd water supply pipe, 9c 3rd water supply pipe, 10 water outlet pipe, 11 three-way valve, 12 circulation pump, 13 hot water supply pipe, 14 HP outbound pipe , 15 HP return pipe, 16 1st bypass pipe, 17 2nd bypass pipe, 18 4-way valve, 20 bath heat exchanger, 20a hot water introduction pipe, 20b hot water outlet pipe, 21 high temperature pipe, 22 hot water supply mixing valve, 23 Mixing valve for bath, 24 1st hot water supply pipe, 25 2nd hot water supply pipe, 26 Electromagnetic valve for bath, 27 Bath going pipe, 28 Bath return pipe, 29 Bath circulation pump, 30 Bath, 31 Pressure reducing valve, 33 Tank unit, 34 Hot water tap, 35 hot water storage type hot water supply device, 36 control unit, 37 bath going temperature sensor, 38 bath return temperature sensor, 42, 43 hot water storage temperature sensor, 44 remote control, 44a display unit, 44b operation unit, 44c sound generator, 45 bath Flow sensor, 46 Hot water flow sensor, 47 Hot water temperature sensor, 49 Water supply temperature sensor, 51 Medium temperature piping, 52 Hot water storage temperature sensor, 53 Medium temperature take-out switching valve, 53a Medium temperature inlet, 53b Low temperature inlet, 53c Water outlet

Claims (8)

A heating means to heat water,
A hot water storage tank for storing hot water heated by the heating means, and
The high-temperature piping that communicates with the hot water storage tank and
A medium-temperature pipe that communicates with the hot water storage tank at a position lower than the high-temperature pipe,
It has a medium-temperature inlet into which medium-temperature water, which is hot water supplied from the hot-water storage tank through the medium-temperature pipe, flows in, a low-temperature inlet in which low-temperature water having a temperature lower than that of the medium-temperature water flows in, and a water outlet. A medium temperature take-out switching valve that can switch the flow path between a medium temperature position that connects the medium temperature inlet to the water outlet and a low temperature position that connects the low temperature inlet to the water outlet.
A hot water side inlet into which high temperature water, which is hot water supplied from the hot water storage tank through the high temperature pipe, flows in, a water side inlet in which water from the water outlet of the medium temperature take-out switching valve flows in, and a hot water side inlet. A mixing valve having a hot water outlet from which mixed hot water, which is a mixture of the hot water flowing in from the water and the water flowing in from the water side inlet, is discharged.
A medium-temperature water temperature sensor that detects the medium-temperature water temperature, which is the temperature of the medium-temperature water, and a medium-temperature water temperature sensor.
A high-temperature water temperature sensor that detects the high-temperature water temperature, which is the temperature of the high-temperature water,
The medium temperature take-out switching valve and the control means for controlling the mixing valve are provided.
When switching the medium temperature take-out switching valve from the low temperature position to the medium temperature position, the control means sets the opening degree of the mixing valve between the high temperature water temperature and the medium temperature water before switching the medium temperature take-out switching valve. Adjust to the mixing opening, which is the opening determined based on the temperature,
When the switching of the medium temperature take-out switching valve is required, if the boiling operation for heating the water in the hot water storage tank by the heating means is being executed, the control means switches the medium temperature take-out switching valve. It is a hot water storage type hot water supply device that is prohibited,
When the switching from the low temperature position to the medium temperature position of the medium temperature take-out switching valve is prohibited during the execution of the boiling operation, and then the boiling operation is completed, the control means is the mixing valve. A hot water storage type hot water supply device that switches the medium temperature take-out switching valve from the low temperature position to the medium temperature position after adjusting the opening degree to the mixing opening degree. A heating means to heat water,
A hot water storage tank for storing hot water heated by the heating means, and
The high-temperature piping that communicates with the hot water storage tank and
A medium-temperature pipe that communicates with the hot water storage tank at a position lower than the high-temperature pipe,
It has a medium-temperature inlet into which medium-temperature water, which is hot water supplied from the hot-water storage tank through the medium-temperature pipe, flows in, a low-temperature inlet in which low-temperature water having a temperature lower than that of the medium-temperature water flows in, and a water outlet. A medium temperature take-out switching valve that can switch the flow path between a medium temperature position that connects the medium temperature inlet to the water outlet and a low temperature position that connects the low temperature inlet to the water outlet.
A hot water side inlet into which high temperature water, which is hot water supplied from the hot water storage tank through the high temperature pipe, flows in, a water side inlet in which water from the water outlet of the medium temperature take-out switching valve flows in, and a hot water side inlet. A mixing valve having a hot water outlet from which mixed hot water, which is a mixture of the hot water flowing in from the water and the water flowing in from the water side inlet, is discharged.
A low-temperature water temperature sensor that detects the low-temperature water temperature, which is the temperature of the low-temperature water,
A high-temperature water temperature sensor that detects the high-temperature water temperature, which is the temperature of the high-temperature water,
The medium temperature take-out switching valve and the control means for controlling the mixing valve are provided.
When the control means switches the medium temperature take-out switching valve from the medium temperature position to the low temperature position, after switching the medium temperature take-out switching valve, the opening degree of the mixing valve is changed to the high temperature water temperature and the low temperature water. Adjust to the mixing opening, which is the opening determined based on the temperature,
When the switching of the medium temperature take-out switching valve is required, if the boiling operation for heating the water in the hot water storage tank by the heating means is being executed, the control means switches the medium temperature take-out switching valve. A hot water storage type hot water supply device that is prohibited. Claim 1 or claim that the control means prohibits switching from the low temperature position to the medium temperature position until a predetermined time elapses after switching the medium temperature take-out switching valve from the medium temperature position to the low temperature position. The hot water storage type hot water supply device according to 2 . A heating means to heat water,
A hot water storage tank for storing hot water heated by the heating means, and
The high-temperature piping that communicates with the hot water storage tank and
A medium-temperature pipe that communicates with the hot water storage tank at a position lower than the high-temperature pipe,
It has a medium-temperature inlet into which medium-temperature water, which is hot water supplied from the hot-water storage tank through the medium-temperature pipe, flows in, a low-temperature inlet in which low-temperature water having a temperature lower than that of the medium-temperature water flows in, and a water outlet. A medium temperature take-out switching valve that can switch the flow path between a medium temperature position that connects the medium temperature inlet to the water outlet and a low temperature position that connects the low temperature inlet to the water outlet.
A hot water side inlet into which high temperature water, which is hot water supplied from the hot water storage tank through the high temperature pipe, flows in, a water side inlet in which water from the water outlet of the medium temperature take-out switching valve flows in, and a hot water side inlet. A mixing valve having a hot water outlet from which mixed hot water, which is a mixture of the hot water flowing in from the water and the water flowing in from the water side inlet, is discharged.
A medium-temperature water temperature sensor that detects the medium-temperature water temperature, which is the temperature of the medium-temperature water, and a medium-temperature water temperature sensor.
A high-temperature water temperature sensor that detects the high-temperature water temperature, which is the temperature of the high-temperature water,
The medium temperature take-out switching valve and the control means for controlling the mixing valve are provided.
When switching the medium temperature take-out switching valve from the low temperature position to the medium temperature position, the control means sets the opening degree of the mixing valve between the high temperature water temperature and the medium temperature water before switching the medium temperature take-out switching valve. Adjust to the mixing opening, which is the opening determined based on the temperature,
When the switching of the medium temperature take-out switching valve is required, if the boiling operation for heating the water in the hot water storage tank by the heating means is being executed, the control means switches the medium temperature take-out switching valve. It is a hot water storage type hot water supply device that is prohibited,
When the boiling operation is started while the opening degree of the mixing valve is adjusted to the mixing opening degree, the control means is a hot water storage type hot water supply device that returns the opening degree of the mixing valve to the original opening degree. A heating means to heat water,
A hot water storage tank for storing hot water heated by the heating means, and
The high-temperature piping that communicates with the hot water storage tank and
A medium-temperature pipe that communicates with the hot water storage tank at a position lower than the high-temperature pipe,
It has a medium-temperature inlet into which medium-temperature water, which is hot water supplied from the hot-water storage tank through the medium-temperature pipe, flows in, a low-temperature inlet in which low-temperature water having a temperature lower than that of the medium-temperature water flows in, and a water outlet. A medium temperature take-out switching valve that can switch the flow path between a medium temperature position that connects the medium temperature inlet to the water outlet and a low temperature position that connects the low temperature inlet to the water outlet.
A hot water side inlet into which high temperature water, which is hot water supplied from the hot water storage tank through the high temperature pipe, flows in, a water side inlet in which water from the water outlet of the medium temperature take-out switching valve flows in, and a hot water side inlet. A mixing valve having a hot water outlet from which mixed hot water, which is a mixture of the hot water flowing in from the water and the water flowing in from the water side inlet, is discharged.
A medium-temperature water temperature sensor that detects the medium-temperature water temperature, which is the temperature of the medium-temperature water, and a medium-temperature water temperature sensor.
A high-temperature water temperature sensor that detects the high-temperature water temperature, which is the temperature of the high-temperature water,
The medium temperature take-out switching valve and the control means for controlling the mixing valve are provided.
When switching the medium temperature take-out switching valve from the low temperature position to the medium temperature position, the control means sets the opening degree of the mixing valve between the high temperature water temperature and the medium temperature water before switching the medium temperature take-out switching valve. Adjust to the mixing opening, which is the opening determined based on the temperature,
When the switching of the medium temperature take-out switching valve is required, if the boiling operation for heating the water in the hot water storage tank by the heating means is being executed, the control means switches the medium temperature take-out switching valve. It is a hot water storage type hot water supply device that is prohibited,
Further, a mixed hot water temperature sensor for detecting the mixed hot water temperature, which is the temperature of the mixed hot water, is provided.
The control means stores the opening degree of the mixing valve when the mixing hot water temperature becomes equal to the target temperature as a stable opening degree, and stores the opening degree.
When the switching operation of the medium temperature take-out switching valve and the mixing valve is completed, the control means is a hot water storage type hot water supply device that discards the information of the stable opening degree. When the control means stores the stable opening degree and the boiling operation is started while adjusting the opening degree of the mixing valve to the mixing opening degree, the control means means the mixing. The hot water storage type hot water supply device according to claim 5 , wherein the opening degree of the valve is returned to the stable opening degree. A heating means to heat water,
A hot water storage tank for storing hot water heated by the heating means, and
The high-temperature piping that communicates with the hot water storage tank and
A medium-temperature pipe that communicates with the hot water storage tank at a position lower than the high-temperature pipe,
It has a medium-temperature inlet into which medium-temperature water, which is hot water supplied from the hot-water storage tank through the medium-temperature pipe, flows in, a low-temperature inlet in which low-temperature water having a temperature lower than that of the medium-temperature water flows in, and a water outlet. A medium temperature take-out switching valve that can switch the flow path between a medium temperature position that connects the medium temperature inlet to the water outlet and a low temperature position that connects the low temperature inlet to the water outlet.
A hot water side inlet into which high temperature water, which is hot water supplied from the hot water storage tank through the high temperature pipe, flows in, a water side inlet in which water from the water outlet of the medium temperature take-out switching valve flows in, and a hot water side inlet. A mixing valve having a hot water outlet from which mixed hot water, which is a mixture of the hot water flowing in from the water and the water flowing in from the water side inlet, is discharged.
A medium-temperature water temperature sensor that detects the medium-temperature water temperature, which is the temperature of the medium-temperature water, and a medium-temperature water temperature sensor.
A high-temperature water temperature sensor that detects the high-temperature water temperature, which is the temperature of the high-temperature water,
The medium temperature take-out switching valve and the control means for controlling the mixing valve are provided.
When switching the medium temperature take-out switching valve from the low temperature position to the medium temperature position, the control means sets the opening degree of the mixing valve between the high temperature water temperature and the medium temperature water before switching the medium temperature take-out switching valve. Adjust to the mixing opening, which is the opening determined based on the temperature,
When the switching of the medium temperature take-out switching valve is required, if the boiling operation for heating the water in the hot water storage tank by the heating means is being executed, the control means switches the medium temperature take-out switching valve. It is a hot water storage type hot water supply device that is prohibited,
During the hot water supply operation from the mixing valve, the control means does not start switching of the medium temperature take-out switching valve even if there is a request for switching of the medium temperature take-out switching valve.
When the hot water supply operation is started after the opening degree of the mixing valve is adjusted to the mixing opening degree, the control means continuously switches from the low temperature position of the medium temperature take-out switching valve to the medium temperature position. Hot water storage type hot water supply device to complete. A heating means to heat water,
A hot water storage tank for storing hot water heated by the heating means, and
The high-temperature piping that communicates with the hot water storage tank and
A medium-temperature pipe that communicates with the hot water storage tank at a position lower than the high-temperature pipe,
It has a medium-temperature inlet into which medium-temperature water, which is hot water supplied from the hot-water storage tank through the medium-temperature pipe, flows in, a low-temperature inlet in which low-temperature water having a temperature lower than that of the medium-temperature water flows in, and a water outlet. A medium temperature take-out switching valve that can switch the flow path between a medium temperature position that connects the medium temperature inlet to the water outlet and a low temperature position that connects the low temperature inlet to the water outlet.
A hot water side inlet into which high temperature water, which is hot water supplied from the hot water storage tank through the high temperature pipe, flows in, a water side inlet in which water from the water outlet of the medium temperature take-out switching valve flows in, and a hot water side inlet. A mixing valve having a hot water outlet from which mixed hot water, which is a mixture of the hot water flowing in from the water and the water flowing in from the water side inlet, is discharged.
A medium-temperature water temperature sensor that detects the medium-temperature water temperature, which is the temperature of the medium-temperature water, and a medium-temperature water temperature sensor.
A high-temperature water temperature sensor that detects the high-temperature water temperature, which is the temperature of the high-temperature water,
The medium temperature take-out switching valve and the control means for controlling the mixing valve are provided.
When switching the medium temperature take-out switching valve from the low temperature position to the medium temperature position, the control means sets the opening degree of the mixing valve between the high temperature water temperature and the medium temperature water before switching the medium temperature take-out switching valve. Adjust to the mixing opening, which is the opening determined based on the temperature,
When the switching of the medium temperature take-out switching valve is required, if the boiling operation for heating the water in the hot water storage tank by the heating means is being executed, the control means switches the medium temperature take-out switching valve. It is a hot water storage type hot water supply device that is prohibited,
After switching the medium temperature take-out switching valve, when the hot water supply operation from the mixing valve is first detected, the hot water storage type hot water supply is further provided with a notification means for notifying information that the hot water supply temperature may fluctuate. Device.

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