JP2005016828A - Hot water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water supply system for preventing the introduction of high temperature hot water into a bathtub during remaining water identifying operation. <P>SOLUTION: The hot water supply system 1 uses hot water stored in a hot water storage tank 12 of a storage type water heater 10 for reheating the hot water stored in the bathtub B. It comprises a reheating outgoing pipe 22a and a reheating return pipe 22b for circulating the hot water in the bathtub B, a reheating circulation pump 24 installed in the reheating outgoing pipe 22a, a reheating coil 21 installed in the hot water storage tank 12 and connected to the reheating outgoing pipe 22a and the reheating return pipe 22b, a bypass pipe 23 connected to the reheating outgoing pipe 22a and the reheating return pipe 22b for bypassing the reheating coil 21, and a change-over three-way valve 25 changeable over between all straight circulation mode and all bypass circulation mode. The hot water in the bathtub B is circulated in the all bypass circulation mode during remaining water identifying operation and in the all straight circulation mode during reheating operation. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hot water supply system using a hot water storage type water heater, and more particularly to a hot water supply system capable of tracking hot water stored in a bathtub.
[0002]
[Prior art]
In this type of hot water supply system, a heat exchange unit that is connected to a remedy pipe that forms a circulation path of hot water in the bathtub, where a circulation pump is installed, is introduced into the hot water storage tank of the hot water storage type water heater. The bypass piping is connected to the additional piping so as to bypass the heat exchanging portion, and either one of the bypass piping in the additional piping is connected to the heat exchanging portion side of the additional piping. There is a switching three-way valve that opens the bypass pipe side flow path when the flow path is closed and closes the bypass pipe side flow path when the heat exchange section flow path in the memorial pipe is opened. .
[0003]
Therefore, when replenishing hot water in the bathtub, when the circulation pump is started after switching the three-way switching valve so that the flow path on the heat exchanging part side in the remnant piping is opened, it is sent out from the bathtub The hot water is led into the hot water storage tank through the memorial pipe, and is exchanged with the hot water in the hot water storage tank in the heat exchanging section, so that the hot water is returned to the bathtub in a heated state.
[0004]
[Patent Document 1]
Japanese Patent Publication No. 7-9313 [0005]
[Problems to be solved by the invention]
By the way, when the water level in the bathtub is lower than the circulation adapter installed in the bathtub, the hot water in the bathtub cannot be circulated and reheated, so even if the retreat switch is turned on, Immediately, instead of performing a chasing operation, first, a remaining water check operation for temporarily starting the circulation pump is performed to determine whether hot water that can be chased is stored in the bathtub. It has become so.
[0006]
However, in the hot water supply system as described above, when the remedy switch is turned on, first, after the switching three-way valve opens the flow path on the heat exchanging portion side in the remedy pipe, the circulation pump starts. Therefore, when the remaining water check operation is started, hot hot water sent from the heat exchange section is introduced into the bathtub, and when there is little remaining water in the bathtub, hot hot water is discharged into the bathtub. There was a risk.
[0007]
Therefore, an object of the present invention is to provide a hot water supply system in which high-temperature hot water is not introduced into a bathtub during a residual water check operation.
[0008]
[Means for solving the problems and effects thereof]
In order to solve the above-mentioned problem, the invention according to claim 1 is a hot water supply system capable of tracking hot water stored in a bathtub, a hot water storage water heater storing hot water in a hot water storage tank, and hot water in the bathtub A circulation flow path for circulating the heat, a circulation pump installed in the circulation flow path, a heat exchange section for exchanging heat between the hot water stored in the hot water storage tank and the hot water in the circulation flow path, and the heat Circulation mode switching that can be switched to a bypass channel connected to the circulation channel and a full bypass circulation mode that returns all hot water sent from the bathtub to the bathtub through the bypass channel so as to bypass the exchange unit And a hot water supply system that circulates hot water in the bathtub in the full bypass circulation mode at the time of the residual water check operation in the bathtub that is performed preliminarily before the start of the memorial operation. I will provide a Than it is.
[0009]
As described above, in this hot water supply system, the hot water in the bathtub is circulated in the all bypass circulation mode at the time of the residual water check operation in the bathtub that is executed preliminarily before the start of the memorial operation. High-temperature hot water delivered from the heat exchanger is not introduced into the bathtub during the residual water check operation, and even when there is little residual water in the bathtub, hot hot water can be discharged into the bathtub. Absent.
[0010]
Further, when the chasing operation is performed after the remaining water confirmation operation, a large amount of hot water is stored in the bathtub, so that even if hot water is introduced into the bathtub, it is alleviated. Therefore, as in the hot water supply system of the invention according to claim 2, the circulation mode switching means can be switched to the all straight circulation mode in which all of the hot water sent from the bathtub is returned to the bathtub through the heat exchange section. In addition, during the memorial operation, the hot water in the bathtub may be circulated in the all straight circulation mode.
[0011]
However, when the bather is chasing in the state of being bathed in the bathtub, if hot water is introduced into the bathtub, the bather may experience discomfort, so the hot water supply system of the invention according to claim 3 As described above, the circulation mode switching means can be switched to the fixed mixing circulation mode in which the hot water passing through the heat exchanging part and the hot water passing through the bypass channel are mixed at a fixed mixing ratio and returned to the bathtub. It is desirable to make it possible to circulate hot water in the bathtub in the fixed mixing circulation mode during the memorial operation.
[0012]
However, when the temperature of the hot water stored in the hot water storage tank is lowered, the hot water in the bathtub is circulated in the fixed mixing circulation mode during the remedy operation, so that the remedy time becomes long. As in the hot water supply system according to the present invention, the circulation mode switching means can be switched to the full straight circulation mode in which all the hot water sent from the bathtub is returned to the bathtub through the heat exchanging section, When the temperature of the hot water stored in the tank falls below a preset reference temperature, it is desirable to perform the chasing operation in the all straight circulation mode.
[0013]
Further, as in the hot water supply system of the invention according to claim 5, the circulation mode switching means passes hot water passing through the heat exchange section and the bypass flow path so that hot water of a predetermined temperature is returned into the bathtub. It is possible to switch to the variable mixing circulation mode that adjusts the mixing ratio with the hot and cold water, and during the memorial operation, the hot water in the bathtub is circulated in the variable mixing circulation mode. Has the advantage that the temperature of the hot water returned to the bathtub during the memorial operation is not easily affected by the temperature of the hot water stored in the hot water storage tank.
[0014]
In addition, as in the hot water supply system according to the sixth aspect of the present invention, it is necessary to circulate hot water in the bathtub in the full bypass circulation mode during the stirring operation that is performed after the completion of the chasing operation.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments will be described with reference to the drawings. As shown in FIG. 1, the hot water supply system 1 includes a hot water storage type hot water heater 10 of a direct heating type that generates hot water for hot water supply to a currant, a shower, and the like and automatic hot water injection to the bathtub B. By performing indirect heating using the heat of the hot water generated by the hot water storage type water heater 10, the hot water stored in the bathtub B can be reclaimed.
[0016]
The hot water storage type water heater 10 stores heat water generated by the heat pump unit 11 by absorbing heat from a low-temperature heat collection source by an evaporator and generating hot water using heat radiation from a high-temperature condenser. The hot water storage tank 12 is connected to each other via a hot water circulation pipe 13 having a hot water circulation pump 14, and hot water stored in the lower side of the hot water storage tank 12 is sent out by the hot water circulation pump 14. Then, after the temperature is raised to a hot water storage set temperature (for example, 90 ° C.) by the heat pump unit 11, the heat pump unit 11 is introduced into the upper side of the hot water storage tank 12.
[0017]
The hot water storage tank 12 is connected to a water supply pipe 15 for supplying low-temperature water such as tap water to the lower end thereof, and has a hot water supply pipe 16 for sending stored hot water to the upper end thereof. When hot water stored in the upper part of the hot water storage tank 12 is sent out from the hot water delivery pipe 16, an amount of low temperature water corresponding to the delivery quantity of the hot water passes through the water supply pipe 15. It is to be introduced on the lower side of the.
[0018]
The hot water storage type water heater 10 has a hot water set temperature and a tank capacity of the hot water storage tank 12 set so that hot water having an amount of heat corresponding to the hot water used in a day can be stored in the hot water storage tank 12. By operating the heat pump unit 11 and the hot water circulation pump 14 at night, the hot water in the hot water storage tank 12 can be raised to the hot water set temperature by the next morning.
[0019]
In addition, a hot water supply pipe 16 for sending hot water at a hot water storage set temperature from the hot water storage tank 12 is connected to a hot water supply pipe 15a via a mixing control valve 17, so By appropriately mixing low temperature water, hot water having a hot water supply set temperature or a bath set temperature can be generated and sent out.
[0020]
In addition, a chasing coil 21 is disposed in the hot water storage tank 12 on the upper side thereof, and the chasing coil 21 and the bathtub B are connected via a chasing forward pipe 22a and a chasing return pipe 22b. By being connected, a circulation channel for circulating hot water stored in the bathtub B is formed, and the bypass piping 23 is connected to the tracking forward piping 22a and the tracking return piping 22b forming the circulation channel. Thus, a bypass flow path that bypasses the memory coil 21 is formed.
[0021]
A memorial circulation pump 24 is installed in the memorial delivery pipe 22 a, and the memorial delivery pipe 22 a and the bypass pipe 23 pass all the hot water sent from the bathtub B through the memorial coil 21. It is connected via a switching three-way valve 25 that can be switched to either one of the all straight circulation mode to return to tub or all the hot water sent from the bathtub B to the all bypass circulation mode to return to the tub B through the bypass pipe 23. Yes.
[0022]
Accordingly, when the hot water stored in the bathtub B is circulated in the all straight circulation mode, the hot water stored in the hot water storage tank 12 is stored when the hot water sent from the bathtub B passes through the coil 21 for memory. After the temperature is raised by exchanging heat with hot water at a temperature, the water is returned to the bathtub B, so that the hot water stored in the bathtub B is chased away. The switching three-way valve 25 is switched to the full bypass circulation mode except during the memorial operation.
[0023]
Further, a hot water delivery pipe 16a branched on the downstream side of the mixing control valve 17 in the warm water delivery pipe 16 is connected to the downstream side of the connecting part of the bypass pipe 23 in the additional return pipe 22b, and this warm water delivery pipe 16a. Is provided with an electromagnetic valve 18 for opening and closing the flow path. Therefore, by opening the solenoid valve 18, hot water having a bath set temperature sent from the mixing control valve 17 can be automatically poured into the bathtub B through the hot water delivery pipe 16a and the additional return pipe 22b. It becomes. Although not shown, a check valve (not shown) is provided on the downstream side of the solenoid valve 18 in the hot water delivery pipe 16a so that hot water stored in the bathtub B does not flow backward to the hot water delivery pipe 16 side. ) Is installed.
[0024]
In the hot water supply system 1 configured as described above, when reheating hot water stored in the bathtub B, a retrace switch of an operation remote controller (not shown) is turned on, but the retreat switch is turned on. However, the switching from the all bypass circulation mode to the all straight circulation mode is not immediately performed. First, the memory circulation pump 24 is activated in the all bypass circulation mode, and the remaining water check operation is started. Here, when a water flow switch (not shown) installed in the circulation flow path is turned ON, it is confirmed that there is residual water at a predetermined level or more in the bathtub B, so that the entire bypass circulation mode is changed to the all straight circulation mode. It switches and the memorial operation is started. In the remaining water check operation, if the water flow switch is not turned on, it is assumed that there is no remaining water in the bathtub B at a predetermined water level or higher, and therefore the chasing operation is not executed.
[0025]
When the hot water stored in the bathtub B is heated up to a predetermined temperature by performing the chasing in this way, the chasing operation is ended by switching from the all straight circulation mode to the all bypass circulation mode. The operation of the memorial circulation pump 24 is not immediately stopped. Finally, the hot water in the bathtub B is circulated for a predetermined time (for example, 30 seconds) in the all bypass circulation mode. After the agitation operation is performed to make the temperature uniform, the operation of the memory circulation pump 24 is stopped.
[0026]
As described above, in this hot water supply system 1, the hot water in the bathtub B is circulated in the all-bypass circulation mode during the remaining water check operation that is performed preliminarily before the start of the chasing operation. Hot hot water delivered from the coffin coil 21 is not introduced into the bathtub B during the residual water check operation, and even when there is little residual water in the bathtub B, hot hot water is discharged into the bathtub. There is nothing to do.
[0027]
In the above-described embodiment, the switching three-way valve 25 switches between the all-straight circulation mode and the all-bypass circulation mode. However, the present invention is not limited to this, and the bypass pipe 23 in the follow-up delivery pipe 22a. Solenoid valves and the like that can open and close the respective flow paths are installed on the downstream side of the connecting portion or on the upstream side of the connecting portion of the bypass piping 23 in the additional return pipe 22b and on the bypass piping 23. It is also possible to switch between the all-straight circulation mode and the all-bypass circulation mode by operating them in reverse.
[0028]
Further, in the above-described embodiment, the hot water in the bathtub B is circulated in the all straight circulation mode at the time of the chasing operation. However, when the bather performs the chasing in the state of being immersed in the bathtub, If hot water is introduced into the bath, the bather may feel uncomfortable, so the hot water passing through the memorial coil 21 and the hot water passing through the bypass pipe 23 are mixed at a fixed ratio (for example, 1: Adopt a switching three-way valve that can be switched to the fixed mixing circulation mode to return to the bathtub B in the mixed state in 1), and keep the hot water in the bathtub B circulated in the fixed mixing circulation mode during the memorial operation. Is also possible.
[0029]
However, when the hot water storage temperature in the hot water storage tank 12 is lowered, the hot water in the bathtub is circulated in the fixed mixing circulation mode as described above during the reheating operation. When the hot water storage temperature detected by the hot water storage temperature sensor 26 (see FIG. 1) installed in the upper part is lower than a preset reference temperature, the mode is switched to the all straight circulation mode and the memorial operation is executed. It is desirable to keep it.
[0030]
Further, as described above, when the chasing operation is executed in the fixed mixed circulation mode, since it is easily affected by the hot water storage temperature, the hot water and the bypass pipe 23 that pass through the chasing coil 21 are used instead of the switching three-way valve. A memorial temperature sensor 27 is employed which employs a mixing control valve capable of mixing and sending out the hot water and water passed through at an arbitrary mixing ratio, and is located downstream of the connecting part of the bypass pipe 23 in the memorial return pipe 22b. It is possible to switch to the variable mixing circulation mode in which the mixing ratio by the mixing control valve is adjusted so that the hot water temperature detected by (see FIG. 1) becomes a predetermined temperature. It is desirable to circulate hot water in the bathtub B in the mode.
[0031]
Moreover, although embodiment mentioned above demonstrated the hot water supply system using the hot water storage type water heater 10 which produces | generates warm water with the heat pump unit 11, it is not limited to this, The gas engine and gas in a boiler and a cogeneration system It is also possible to use various hot water storage water heaters that generate hot water by exhaust heat from the turbine.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an embodiment of a hot water supply system according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hot water supply system 10 Hot water storage type water heater 11 Heat pump unit 12 Hot water storage tank 13 Hot water circulation pipe 14 Hot water circulation pumps 15 and 15a Hot water supply pipes 16 and 16a Hot water delivery pipe 17 Mixing control valve 18 Electromagnetic valve 21
22a Pursuit piping (circulation flow path)
22b Additional return piping (circulation flow path)
23 Bypass piping (bypass flow path)
24 Memorial circulation pump (circulation pump)
25 switching three-way valve (circulation mode switching means)
26 Hot water storage temperature sensor 27 Remembrance temperature sensor B Bathtub

Claims (6)

A hot water supply system capable of tracking hot water stored in a bathtub,
A hot water storage water heater that stores hot water in a hot water storage tank;
A circulation channel for circulating hot water in the bathtub,
A circulation pump installed in the circulation flow path;
A heat exchange section for exchanging heat between the hot water stored in the hot water storage tank and the hot water in the circulation channel;
A bypass flow path connected to the circulation flow path so as to bypass the heat exchange section;
A circulation mode switching means capable of switching to all bypass circulation mode for returning all hot water sent from the bathtub to the bathtub through the bypass flow path;
A hot water supply system configured to circulate hot water in a bathtub in a full bypass circulation mode during a remaining water check operation in the bathtub, which is performed preliminarily before the start of the memorial operation. The circulation mode switching means is configured to be able to switch to all straight circulation modes in which all of the hot water sent from the bathtub is returned to the bathtub through the heat exchange unit,
The hot water supply system according to claim 1, wherein hot water in the bathtub is circulated in a full straight circulation mode during the memorial operation. The circulation mode switching means can be switched to a fixed mixing circulation mode in which hot water passing through the heat exchange section and hot water passing through the bypass channel are mixed at a fixed mixing ratio and returned to the bathtub. And
The hot water supply system according to claim 1, wherein hot water in the bathtub is circulated in the fixed mixing circulation mode during the memorial operation. The circulation mode switching means is configured to be able to switch to all straight circulation modes in which all of the hot water sent from the bathtub is returned to the bathtub through the heat exchange unit,
The hot water supply system according to claim 3, wherein when the temperature of the hot water stored in the hot water storage tank is lower than a preset reference temperature, the memorial operation is executed in the all straight circulation mode. . The circulation mode switching means switches to a variable mixing circulation mode that adjusts a mixing ratio of hot water that has passed through the heat exchange section and hot water that has passed through the bypass channel so that hot water at a predetermined temperature is returned to the bathtub. Is able to
The hot water supply system according to claim 1, wherein hot water in the bathtub is circulated in the variable mixing circulation mode during the memorial operation. The hot water supply system according to claim 1, 2, 3, 4, or 5, wherein hot water in the bathtub is circulated in the all bypass circulation mode at the time of the stirring operation performed after the completion of the memorial operation.

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