JP7230497B2 - water heater - Google Patents

Description

The present invention relates to a water heater.

Patent Document 1 (Japanese Patent No. 3559350) discloses a bath water circulation device. The bath water circulation device described in Patent Document 1 has a circulation path, a circulation path, a dechlorination filter, and a first valve and a second valve.

The circulation path sucks the bathtub water stored in the bathtub and returns the bathtub water to the bathtub again. The circulation channel is connected to the circulation channel at one end and the other end. A dechlorination filter is arranged on the circulation flow path. The first valve is arranged on the circulation flow path upstream of the dechlorination filter. The second valve is arranged on the circulation path between the one end of the circulation path and the connection portion of the circulation path and the other end of the circulation path and the connection portion of the circulation path.

When removing chlorine from the bath water, the first valve is opened and the second valve is closed. As a result, the bathtub water flows through the circulation flow path, and chlorine in the bathtub water is removed by the dechlorination filter.

Japanese Patent No. 3559350

As described above, in the bath water circulation device described in Patent Document 1, chlorine in the bath water can be removed during the reheating operation. However, Patent Literature 1 does not disclose the removal of additives (such as chlorine) contained in clean water during the hot water filling operation. In addition, when the additives contained in the tap water are always removed, trouble may occur when cleaning each pipe using the tap water.

The present invention has been made in view of the problems of the prior art as described above. More specifically, the present invention provides a water heating apparatus capable of removing additives contained in tap water during filling operation and not removing additives contained in tap water during washing operation. do.

A hot water device according to an aspect of the present invention includes a circulation pipeline connected to a bathtub, a hot water supply pipeline for supplying clean water containing an additive, and a water supply pipeline connecting the circulation pipeline and the hot water supply pipeline. A hot water pipe line and a control unit are provided. The pouring pipeline has a channel switching valve, a first pipeline, a second pipeline, and a third pipeline. The first pipeline has one end connected to the hot water supply pipeline and the other end connected to the flow path switching valve. The second pipeline has one end connected to the flow path switching valve and the other end connected to the circulation pipeline. The third pipeline has one end connected to the flow path switching valve and the other end connected to either the first pipeline or the second pipeline. The third line contains a filter section for removing additives from the drinking water. The flow path switching valve has a first state in which the clean water flowing through the first pipeline flows through the third pipeline to the second pipeline, and a first state in which the clean water flowing through the first pipeline does not pass through the third pipeline. It is configured to be switchable between a second state of flowing to the second conduit. The control unit controls the flow path switching valve to the first state when performing a hot water filling operation for supplying tap water to the bathtub through the pouring pipe and the circulation pipe, and controls the flow path switching valve to the first state. It is configured to control the flow path switching valve to the second state when cleansing the circulation pipeline by supplying tap water.

According to the above water heater, since the control unit controls the flow path switching valve to the first state during the hot water filling operation, the additive contained in the tap water is removed during the hot water filling operation, and the additive is removed from the bathtub. water is supplied. On the other hand, according to the above water heater, the control unit controls the flow path switching valve to the second state during the cleaning operation, so that the additive contained in the tap water is not removed during the cleaning operation, and the cleaning operation is performed without removing the additive. water that has not been removed.

In the above hot water washing apparatus, the additive of tap water may be chlorine. In this case, the bathtub can be filled with clean water from which chlorine has been removed, and the cleaning effect can be enhanced by the cleaning operation with clean water from which chlorine has not been removed.

In the above water heater, the other end of the third pipeline may be connected to the second pipeline.
In the above water heater, the third pipeline may include a check valve arranged downstream of the filter section.

In the above water heater, the other end of the third pipeline may be connected to the first pipeline.
In the above water heater, the pouring pipeline may further have a flow rate sensor for measuring the flow rate of clean water flowing through the first pipeline. The control unit is configured to control the flow path switching valve to the second state when the subsequent hot water filling operation is performed when the accumulated value of the flow rate during the hot water filling operation reaches or exceeds the first threshold value. may

In this case, it is possible to switch to the hot water filling operation not via the third conduit before the clogging of the filter section becomes large and the hot water filling operation via the third conduit becomes difficult.

In the above-described water heater, if the first time elapsed after the initial hot water filling operation is performed is equal to or greater than the second threshold, the control unit controls the flow path when performing the subsequent hot water filling operation. It may be configured to control the switching valve to the second state.

In this case, it is possible to switch to the hot water filling operation not via the third conduit before the clogging of the filter section becomes large and the hot water filling operation via the third conduit becomes difficult.

In the above water heater, the pouring pipeline may further have a flow rate sensor for measuring the flow rate of clean water flowing through the first pipeline. When the value obtained by dividing the flow rate during the most recent hot water filling operation by the flow rate during the most recent cleaning operation is equal to or less than the third threshold value, the control unit switches the flow path switching valve to the second position when performing subsequent hot water filling operations. It may be configured to control in two states.

In this case, it is possible to switch to the hot water filling operation not via the third conduit before the clogging of the filter section becomes large and the hot water filling operation via the third conduit becomes difficult.

In the above water heater, the pouring pipeline may further have a flow rate sensor for measuring the flow rate of clean water flowing through the first pipeline. When the value obtained by dividing the flow rate during the most recent filling operation by the flow rate during the first filling operation becomes equal to or less than the fourth threshold value, the control unit operates the flow path switching valve when performing subsequent filling operations. It may be configured to control to the second state.

In this case, it is possible to switch to the hot water filling operation not via the third conduit before the clogging of the filter section becomes large and the hot water filling operation via the third conduit becomes difficult.

The above water heater may further include an operation unit configured to receive an instruction from the user not to remove the additive from the tap water during the hot water filling operation. When the operation unit receives the instruction, the control unit may be configured to control the flow path switching valve to the second state when the subsequent hot water filling operation is performed.

In this case, it is possible to decide whether to supply clean water from which additives have been removed to the bathtub based on the user's preference.

In the above water heater, the filter section may be a filter containing activated carbon as an adsorbent.

In the above water heater, the pouring pipe may further have a silver ion generator for generating silver ions. The silver ion generator may be arranged upstream of the filter section.

In this case, the silver ions from the silver ion generator can suppress the propagation of germs around the filter section.

In the above water heater, the controller may be configured to operate the silver ion generator each time the hot water filling operation is performed a predetermined number of times.

Increasing the operation frequency of the silver ion generator makes it easier to suppress the growth of bacteria around the filter, but the performance of the filter tends to decrease due to silver ions, and the life of the filter may be relatively shortened. . Therefore, in this case, by operating the silver ion generator every time the hot water filling operation is performed a predetermined number of times, it is possible to suppress the deterioration of the service life of the filter while suppressing the propagation of various bacteria around the filter. can.

In the above water heater, the controller may be configured to restart the silver ion generator after the second time has passed since the most recent operation of the silver ion generator.

If the frequency of operation of the silver ion generator is increased, it is easy to suppress the propagation of bacteria in the vicinity of the filter, but silver ions tend to clog the filter, which may shorten the life of the filter. Therefore, in this case, by restarting the silver ion generator after the lapse of the second time since the most recent operation of the silver ion generator, the propagation of various bacteria around the filter is suppressed, and the service life of the filter is extended. deterioration can be suppressed.

According to the water heater according to one aspect of the present invention, it is possible to remove the additive contained in the tap water during the hot water filling operation and not remove the additive contained in the tap water during the washing operation.

1 is a schematic diagram of a water heater according to a first embodiment; FIG. It is a mimetic diagram of a water heater concerning a modification of a 1st embodiment. It is a schematic diagram of the water heater which concerns on 2nd Embodiment.

Details of embodiments will be described with reference to the drawings. In the drawings below, the same or corresponding parts are denoted by the same reference numerals, and redundant description will not be repeated.

(First embodiment)
A hot water device according to the first embodiment will be described.

<Structure of Water Heater According to First Embodiment>
The configuration of the water heater according to the first embodiment will be described below.

As shown in FIG. 1, the water heater according to the first embodiment has a circulation pipeline 10, a hot water supply pipeline 20, a hot water supply pipeline 30, a control section 40, and an operation section 50. .

[Configuration of circulating pipeline]
The circulation line 10 has a pipe 11 a , a pipe 11 b , a heat exchanger 12 and a burner 13 . Pipe 11a is connected to pipe 61a at one end. The pipe 61 a is connected to a circulation adapter 62 installed in the bathtub 6 . Pipe 11a is connected to heat exchanger 12 at the other end. Pipe 11b is connected to heat exchanger 12 at one end. Pipe 11b is connected to pipe 61b at the other end. The pipe 61 b is connected to the circulation adapter 62 . That is, the circulation pipeline 10 is connected to the bathtub 6 .

The heat exchanger 12 exchanges heat with the combustion gas generated by the burner 13 . The heat exchanger 12 is, for example, a fin-and-tube heat exchanger. Burner 13 is, for example, a Bunsen burner. The pump 14 circulates hot water along the arrow direction in FIG. The pump 14 is arranged, for example, on the path of the pipe 11a.

[Configuration of hot water supply pipe]
The hot water supply pipeline 20 has a pipeline 21a, a pipeline 21b, a heat exchanger 22, and a burner 23. As shown in FIG. One end of the pipe 21a is connected to the water supply. Pipe 21a is connected to heat exchanger 22 at the other end. Pipe 21b is connected to heat exchanger 22 at one end. The other end of the pipe 21b is connected to a callan or the like.

The heat exchanger 22 exchanges heat with the combustion gas generated by the burner 23 . The heat exchanger 22 is, for example, a fin-and-tube heat exchanger. Burner 23 is, for example, a Bunsen burner.

[Configuration of pouring pipe]
The pouring pipeline 30 has a first pipeline 31 , a second pipeline 32 , a third pipeline 33 , and a flow path switching valve 34 . The pouring pipeline 30 connects the circulation pipeline 10 and the hot water supply pipeline 20 .

The first pipeline 31 has a pipeline 31a, a pipeline 31b, a pouring valve 31c, and a flow rate sensor 31d. The pipe 31a has one end connected to the pipe 21a and the other end connected to the pouring valve 31c. One end of the pipe 31b is connected to the pouring valve 31c, and the other end is connected to the channel switching valve . That is, first pipeline 31 is connected to hot water supply pipeline 20 at one end and to flow path switching valve 34 at the other end.

The pouring valve 31c is composed of, for example, an electromagnetic valve. The flow rate sensor 31 d measures the flow rate of clean water flowing through the first pipeline 31 . The flow rate sensor 31d is built in, for example, the pouring valve 31c. The pouring valve 31c and the flow rate sensor 31d are connected to the controller 40 . Since the flow rate of clean water flowing through the first pipeline 31 during the hot water filling operation is affected by the degree of clogging of the filter portion 33b, the more the hot water filling operation is repeated, the more the hot water filling operation is performed. The flow rate of clean water flowing through the first pipeline 31 tends to decrease. On the other hand, the flow rate of clean water flowing through the first conduit 31 during the cleaning operation is not affected by the degree of clogging of the filter portion 33b, and therefore changes little over time.

The second pipeline 32 is composed of a pipeline 32a. The second pipeline 32 (pipe 32a) has one end connected to the flow path switching valve 34 and the other end connected to the circulation pipeline 10 (pipe 11a).

The third pipeline 33 has a pipeline 33a, a filter section 33b, and a check valve 33c. The pipe 33a has one end connected to the flow path switching valve 34 and the other end connected to the second pipe 32 (pipe 32a). That is, the third pipeline 33 has one end connected to the flow path switching valve 34 and the other end connected to the second pipeline 32 .

The filter part 33b is arranged on the path of the pipe 33a. The filter part 33b is, for example, a filter containing activated carbon as an adsorbent. The filter part 33b can remove additives contained in tap water. This additive is, for example, chlorine. Since clean water contains dust and the like, if the hot water filling operation is repeated, clogging of the filter portion 33b with dust and the like progresses gradually. The check valve 33c is arranged on the path of the pipe 33a on the downstream side (closer to the other end) than the filter portion 33b. The check valve 33c allows hot water to flow in the direction from the upstream side to the downstream side, but blocks the flow of hot water from the downstream side to the upstream side.

The channel switching valve 34 is connected to the controller 40 . The channel switching valve 34 is configured to be switchable between a first state and a second state. When the channel switching valve 34 is in the first state, clean water flowing through the first pipeline 31 flows through the third pipeline 33 to the second pipeline 32 and reaches the circulation pipeline 10 . On the other hand, when the channel switching valve 34 is in the second state, the clean water flowing through the first pipeline 31 flows into the second pipeline 32 without passing through the third pipeline 33, and the circulation pipeline reach 10.

From another point of view, when the channel switching valve 34 is in the first state, clean water from which impurities have been removed reaches the circulation pipeline 10, and when the channel switching valve 34 is in the second state. , clean water from which impurities have not been removed reaches the circulation line 10 .

The channel switching valve 34 is, for example, a ball valve type three-way valve. A ball valve type three-way valve is switched between a first state and a second state by being driven by a stepping motor or the like connected to the control unit 40 .

[Configuration of control unit]
The control unit 40 is composed of, for example, a microcontroller. The control unit 40 has a storage unit 41 and a timer unit 42 . The storage unit 41 is, for example, a flash memory or the like built in the microcontroller. The timer unit 42 is, for example, a timer circuit built in a microcontroller.

The storage unit 41 holds data relating to the flow rate of clean water flowing through the first pipeline 31 measured by the flow rate sensor 31d. This data is divided into data for the hot water filling operation and data for the cleaning operation and held. The timer unit 42 measures the elapsed time after the first hot water filling operation is performed.

[Construction of Operation Unit]
The operation unit 50 receives various instructions from the user regarding the operation of the water heater. In order to accept an instruction from the user, an item corresponding to the content of the instruction that the user intends to make is selected and determined on the screen provided in the operation unit 50 using the buttons provided in the operation unit 50. It is done by Instructions that may be received from the user include at least an instruction not to remove additives from the tap water during the filling operation. The operation unit 50 outputs to the control unit 40 a signal corresponding to the content of the instruction received from the user.

<Operation of the water heater according to the first embodiment>
The operation of the water heater according to the first embodiment will be described below.

[Hot water supply operation]
When the hot water supply operation is performed in the water heater according to the first embodiment, tap water is supplied to the heat exchanger 22 through the pipe 21a. The clean water supplied to the heat exchanger 22 heat-exchanges with the combustion gas generated in the burner 23, thereby increasing its temperature. The clean water that has passed through the heat exchanger 22 is discharged from the other end of the pipe 21b.

[Reheating operation]
When the reheating operation is performed in the water heater according to the first embodiment, bathtub water stored in the bathtub 6 is sucked from the suction port of the circulation adapter 62 . This bath water is supplied to the heat exchanger 12 through the pipes 61a and 11a. The temperature of the bath water supplied to the heat exchanger 12 rises by exchanging heat with the combustion gas generated in the burner 13 . Bathtub water that has passed through heat exchanger 12 returns to bathtub 6 via piping 11 b , piping 61 b and the outlet of circulation adapter 62 .

[Hot water filling operation]
When the hot water supply device according to the first embodiment performs the hot water filling operation, the controller 40 opens the hot water supply valve 31c and sets the flow path switching valve 34 to the first state. Therefore, clean water flowing through the pipe 21b is supplied to the pipe 33a (the third pipe 33) through the pipe 31a, the hot water supply valve 31c, the pipe 31b, and the flow path switching valve 34 (the first pipe 31). . The tap water supplied to the third pipeline 33 has additives such as chlorine removed in the filter portion 33b, and then flows to the second pipeline 32 (pipe 32a), to the pipeline 11a (circulation pipeline 10). supplied. The clean water supplied to the pipe 11a is supplied to the bathtub 6 via the pipe 61a and the discharge port of the circulation adapter 62, and is also supplied to the heat exchanger 12, the pipe 11b, the pipe 61b and the discharge port of the circulation adapter 62. It is supplied to the bathtub 6.

The control unit 40 refers to the storage unit 41, and when the cumulative value of the flow rate of the clean water flowing through the first pipe line 31 during the hot water filling operation from the first time to the most recent time is equal to or greater than a predetermined threshold, During the hot water filling operation, the channel switching valve 34 may be controlled to be in the second state. The control unit 40 refers to the timer unit 42, and if the time that has elapsed after the initial hot water filling operation is equal to or greater than a predetermined threshold value, the flow path switching valve 34 may be controlled to be in the second state.

The control unit 40 refers to the storage unit 41, and determines the flow rate of clean water that flowed through the first pipeline 31 during the most recent hot-water filling operation as the flow rate of clean water that flowed through the first pipeline 31 during the first hot-water filling operation. When the divided value becomes equal to or less than a predetermined threshold value, the flow path switching valve 34 may be controlled to be in the second state during subsequent hot water filling operations.

The control unit 40 refers to the storage unit 41 and adjusts the flow rate of the clean water that flowed through the first pipeline 31 during the most recent hot water filling operation to the flow rate of the clean water that flowed through the first pipeline 31 during the most recent washing operation. When the divided value becomes equal to or less than a predetermined threshold value, the flow path switching valve 34 may be controlled to be in the second state during subsequent hot water filling operations.

[Washing operation]
In the water heater according to the first embodiment, when the bathtub water stored in the bathtub 6 is discharged from the bathtub 6, the washing operation is performed. When the water heater according to the first embodiment performs the cleaning operation, the control unit 40 opens the hot water supply valve 31c and sets the flow path switching valve 34 to the second state. Therefore, clean water flowing through the pipe 21b is supplied to the pipe 11a via the first pipe 31 and the third pipe 33. As shown in FIG. That is, additives such as chlorine are not removed from the clean water supplied to the pipe 11a. The clean water supplied to the pipe 11a flows to the bathtub 6 through the pipe 61a and the discharge port of the circulation adapter 62, and the clean water supplied to the pipe 11a flows through the heat exchanger 12, the pipe 11b, the pipe 61b, and the circulation adapter. The circulation line 10 is washed by flowing it into the bath 6 through the discharge port 62 .

<Configuration of Water Heater According to Modification of First Embodiment>
The configuration of the water heater according to the modification of the first embodiment will be described below. Here, points different from the configuration of the water heater according to the first embodiment will be mainly described, and redundant description will not be repeated.

As shown in FIG. 2, in the configuration of the water heater according to the modification of the first embodiment, the pouring pipe 30 has first to third pipes 31 to 33 and a flow path switching valve 34. one end of the first pipeline 31 is connected to the hot water supply pipeline 20 and the other end is connected to the flow channel switching valve 34; With respect to the point that the third pipeline 33 is connected to the path switching valve 34 and the circulation pipeline 10 at the other end, and the third pipeline 33 is connected to the flow path switching valve 34 at the one end, the first embodiment It is the same as the configuration of the water heater according to the form.

The configuration of the water heater according to the modification of the first embodiment is that the other end of the third pipeline 33 is connected to the first pipeline 31 and the third pipeline 33 has a check valve 33c. It is different from the configuration of the water heater according to the first embodiment in that it is not installed. Also in the water heater according to the modification of the first embodiment, as in the water heater according to the first embodiment, by switching the flow path switching valve 34 (three-way valve), Water can flow to the second pipe line 32 via the third pipe line 33 during the hot water filling operation, and can flow to the second pipe line 32 without passing through the third pipe line 33 during the washing operation. can.

<Effect of the water heater according to the first embodiment>
In the hot water apparatus according to the first embodiment, the control unit 40 controls the flow path switching valve 34 to the first state during the hot water filling operation, so that the additive contained in the tap water is removed during the hot water filling operation, and the bathtub 6 is supplied with tap water from which additives have been removed. On the other hand, since the control unit 40 controls the flow path switching valve 34 to the second state during the cleaning operation, the additive contained in the tap water is not removed during the cleaning operation, and the additive is not removed during the cleaning operation. It is carried out by water supply.

When the additive of tap water is chlorine, since the bathtub 6 can be filled with tap water from which chlorine has been removed, irritation to the skin of the bather can be reduced. Further, in this case, since the cleaning operation can be performed with tap water from which chlorine has not been removed, the cleaning effect can be enhanced.

If the control unit 40 controls the flow path switching valve 34 to the second state when performing the subsequent hot water filling operation when the cumulative value of the flow rate during the hot water filling operation reaches or exceeds a predetermined threshold value, the filter unit 33b It is possible to switch to the hot water filling operation not via the third pipe 33 before the clogging increases and the hot water filling operation via the third pipe 33 becomes difficult.

When the time elapsed after the first hot water filling operation is performed reaches or exceeds a predetermined threshold, if the control unit 40 controls the flow path switching valve 34 to the second state when performing subsequent hot water filling operations, Before the clogging of the filter portion 33b increases and the hot water filling operation via the third pipe 33 becomes difficult, it is possible to switch to the hot water filling operation without the third pipe 33.

When the value obtained by dividing the flow rate during the most recent hot water filling operation by the flow rate during the most recent cleaning operation becomes equal to or less than a predetermined threshold value, the flow path switching valve 34 is switched when the controller 40 performs the subsequent hot water filling operation. If the two states are controlled, before the clogging of the filter portion 33b increases and the hot water filling operation via the third pipe 33 becomes difficult, it is possible to switch to the hot water filling operation without the third pipe 33. becomes. The source pressure of the tap water supplied from the tap water fluctuates somewhat depending on the season. Since the degree of clogging of the filter portion 33b is estimated, it is less likely to be affected by the original pressure of the tap water supplied from the tap water supply.

When the value obtained by dividing the flow rate in the most recent hot water filling operation by the flow rate in the first hot water filling operation is equal to or less than a predetermined threshold value, the control unit 40 switches the flow path switching valve 34 when performing the subsequent hot water filling operation. By controlling to the second state, it is possible to switch to the hot water filling operation not via the third pipe line 33 before the clogging of the filter portion 33b increases and the hot water filling operation via the third pipe line 33 becomes difficult. It becomes possible.

(Hot water device according to the second embodiment)
A hot water device according to the second embodiment will be described.

<Configuration of Water Heater According to Second Embodiment>
The configuration of the water heater according to the second embodiment will be described below. Here, points different from the configuration of the water heater according to the first embodiment will be mainly described, and redundant description will not be repeated.

As shown in FIG. 3 , in the water heater according to the second embodiment, the pouring pipe line 30 further has a silver ion generator 35 . In this regard, the configuration of the water heater according to the second embodiment is different from that of the water heater according to the first embodiment, and the remaining points are the same as the configuration of the water heater according to the first embodiment. ing.

The silver ion generator 35 is arranged upstream of the filter portion 33b. More specifically, the silver ion generator 35 is arranged on the path of the pipe 31b. The silver ion generator 35 is constructed by inserting a pair of electrodes made of a material containing silver into the pipe 31b. This pair of electrodes is connected to the controller 40 . Silver ions are supplied to clean water flowing through the pipe 31b by being controlled by the control unit 40 so as to apply a voltage between the pair of electrodes.

In addition, in the water heater according to the second embodiment, in addition to the time that has passed after the initial hot water filling operation, the time that has passed since the most recent operation of the silver ion generator 35 was performed. is also measured.

<Operation of the water heater according to the second embodiment>
The operation of the water heater according to the second embodiment will be described below. Here, differences from the operation of the water heater according to the first embodiment will be mainly described, and redundant description will not be repeated.

The silver ion generator 35 is controlled by the controller 40 so as to operate during the hot water filling operation. The silver ion generator 35 preferably operates when the channel switching valve 34 is in the first state. As a result, the generated silver ions reach the filter portion 33b. The silver ion generator 35 preferably operates each time the hot water filling operation is performed multiple times. It is preferable that the silver ion generator 35 refers to the timer unit 42 and is restarted after a predetermined time has passed since the silver ion generator 35 was operated most recently. The silver ion generator 35 may operate when the channel switching valve 34 is in the second state.

<Effect of the water heater according to the second embodiment>
Below, the effect of the water heater according to the second embodiment will be described. Here, differences from the effects of the water heater according to the first embodiment will be mainly described, and redundant description will not be repeated.

In the water heater according to the second embodiment, since the silver ions generated in the silver ion generator 35 are supplied to the filter portion 33b, it is possible to suppress the propagation of germs around the filter portion 33b.

When the operation frequency of the silver ion generator 35 is increased, it is easy to suppress the propagation of bacteria around the filter section 33b, but the performance of the filter section 33b is likely to deteriorate due to the silver ions, and the service life of the filter section 33b is relatively shortened. may be shortened. Therefore, by operating the silver ion generator 35 each time the hot water filling operation is performed a predetermined number of times, it is possible to suppress the propagation of various germs in the vicinity of the filter section 33b and suppress the deterioration of the life of the filter section. Further, by restarting the silver ion generator 35 after a predetermined time has passed since the most recent operation of the silver ion generator 35, the deterioration of the life of the filter part while suppressing the propagation of various germs around the filter part 33b. can be suppressed.

The embodiments disclosed this time are illustrative in all respects and should be considered not restrictive. The scope of the present invention is indicated by the scope of the claims rather than the above-described embodiments, and is intended to include all modifications within the scope and meaning of equivalents to the scope of the claims.

The above embodiment is particularly advantageously applied to a water heater having a function of removing additives from tap water.

10 circulation pipeline, 11a piping, 11b piping, 12 heat exchanger, 13 burner, 14 pump, 20 hot water supply pipeline, 21a piping, 21b piping, 22 heat exchanger, 23 burner, 30 pouring pipeline, 31 first first Pipeline 31a Pipe 31b Pipe 31c Pouring valve 31d Flow sensor 32 Second pipe 32a Pipe 33 Third pipe 33a Pipe 33b Filter section 33c Check valve 34 Flow switching valve , 35 silver ion generator, 40 control section, 41 storage section, 42 timer section, 50 operation section, 6 bathtub, 61a piping, 61b piping, 62 circulation adapter.

Claims (11)

a circulation conduit connected to the bathtub;
A hot water supply pipe for supplying clean water containing additives;
a pouring pipeline connecting the circulation pipeline and the hot water supply pipeline;
and a control unit,
The hot water pouring pipeline includes a flow path switching valve, a first pipeline having one end connected to the hot water supply pipeline and the other end connected to the flow path switching valve, A second pipeline connected to the flow switching valve and having the other end connected to the circulation pipeline; and a second pipeline having one end connected to the flow switching valve and having the other end connected to the first and a third pipeline connected to one of the pipeline and the second pipeline,
The third pipeline includes a filter section that removes the additive from the tap water,
The flow path switching valve is configured such that the clean water flowing through the first pipeline flows into the second pipeline via the third pipeline, and the clean water flowing through the first pipeline is in the first state. It is configured to be switchable between a second state in which it flows to the second pipeline without passing through the third pipeline,
The control unit controls the flow path switching valve to the first state when performing a hot water filling operation for supplying the clean water to the bathtub through the pouring pipeline and the circulation pipeline, and The flow channel switching valve is controlled to the second state when the clean water is supplied through the pouring pipe to perform the cleaning operation of the circulation pipe,
The pouring pipeline further has a flow rate sensor that measures the flow rate of the clean water flowing through the first pipeline,
When the cumulative value of the flow rate during the hot water filling operation becomes equal to or greater than a first threshold value, the control unit controls the flow path switching valve to the second state when performing the hot water filling operation thereafter. A water heater configured to . a circulation conduit connected to the bathtub;
A hot water supply pipe for supplying tap water containing additives;
a pouring pipeline connecting the circulation pipeline and the hot water supply pipeline;
and a control unit,
The hot water pouring pipeline includes a flow path switching valve, a first pipeline having one end connected to the hot water supply pipeline and the other end connected to the flow path switching valve, A second pipeline connected to the flow switching valve and having the other end connected to the circulation pipeline; and a second pipeline having one end connected to the flow switching valve and having the other end connected to the first and a third pipeline connected to one of the pipeline and the second pipeline,
The third pipeline includes a filter section that removes the additive from the tap water,
The flow path switching valve is configured such that the clean water flowing through the first pipeline flows into the second pipeline via the third pipeline, and the clean water flowing through the first pipeline is in the first state. It is configured to be switchable between a second state in which it flows to the second pipeline without passing through the third pipeline,
The control unit controls the flow path switching valve to the first state when performing a hot water filling operation for supplying the clean water to the bathtub through the hot water pouring pipeline and the circulation pipeline, The flow channel switching valve is controlled to the second state when the clean water is supplied through the pouring pipe to perform the cleaning operation of the circulation pipe,
When the first time elapsed after the initial hot water filling operation is performed is equal to or greater than a second threshold value, the control unit switches the flow path switching valve to the first time when performing the subsequent hot water filling operation. A water heater configured to control in two states. a circulation conduit connected to the bathtub;
A hot water supply pipe for supplying tap water containing additives;
a pouring pipeline connecting the circulation pipeline and the hot water supply pipeline;
and a control unit,
The hot water pouring pipeline includes a flow path switching valve, a first pipeline having one end connected to the hot water supply pipeline and the other end connected to the flow path switching valve, A second pipeline connected to the flow switching valve and having the other end connected to the circulation pipeline; and a second pipeline having one end connected to the flow switching valve and having the other end connected to the first and a third pipeline connected to one of the pipeline and the second pipeline,
The third pipeline includes a filter section that removes the additive from the tap water,
The flow path switching valve is configured such that the clean water flowing through the first pipeline flows into the second pipeline via the third pipeline, and the clean water flowing through the first pipeline is in the first state. It is configured to be switchable between a second state in which it flows to the second pipeline without passing through the third pipeline,
The control unit controls the flow path switching valve to the first state when performing a hot water filling operation for supplying the clean water to the bathtub through the hot water pouring pipeline and the circulation pipeline, The flow channel switching valve is controlled to the second state when the clean water is supplied through the pouring pipe to perform the cleaning operation of the circulation pipe,
The pouring pipeline further has a flow rate sensor that measures the flow rate of the clean water flowing through the first pipeline,
When the value obtained by dividing the flow rate in the most recently performed hot water filling operation by the flow rate in the most recently performed cleaning operation is equal to or less than a third threshold value, the controller controls the subsequent hot water filling operation. A water heater configured to control the flow path switching valve to the second state when operating. a circulation conduit connected to the bathtub;
A hot water supply pipe for supplying tap water containing additives;
a pouring pipeline connecting the circulation pipeline and the hot water supply pipeline;
and a control unit,
The hot water pouring pipeline includes a flow path switching valve, a first pipeline having one end connected to the hot water supply pipeline and the other end connected to the flow path switching valve, A second pipeline connected to the flow switching valve and having the other end connected to the circulation pipeline; and a second pipeline having one end connected to the flow switching valve and having the other end connected to the first and a third pipeline connected to one of the pipeline and the second pipeline,
The third pipeline includes a filter section that removes the additive from the tap water,
The flow path switching valve is configured such that the clean water flowing through the first pipeline flows into the second pipeline via the third pipeline, and the clean water flowing through the first pipeline is in the first state. It is configured to be switchable between a second state in which it flows to the second pipeline without passing through the third pipeline,
The control unit controls the flow path switching valve to the first state when performing a hot water filling operation for supplying the clean water to the bathtub through the hot water pouring pipeline and the circulation pipeline, The flow channel switching valve is controlled to the second state when the clean water is supplied through the pouring pipe to perform the cleaning operation of the circulation pipe,
The pouring pipeline further has a flow rate sensor that measures the flow rate of the clean water flowing through the first pipeline,
When the value obtained by dividing the flow rate in the most recent hot water filling operation by the flow rate in the first hot water filling operation is equal to or less than a fourth threshold value, the control unit determines when the subsequent hot water filling operation is performed. , a water heater configured to control the flow path switching valve to the second state. The water heater according to any one of claims 1 to 4 , wherein the additive is chlorine. The other end of the third pipeline is connected to the second pipeline,
The water heater according to any one of claims 1 to 5, wherein the third pipeline includes a check valve arranged downstream of the filter section . further comprising an operation unit configured to accept an instruction from a user not to remove the additive from the tap water during the hot water filling operation,
Claims 1 to 3, wherein when the operation unit receives the instruction, the control unit controls the flow path switching valve to the second state when performing the subsequent hot water filling operation. The water heater according to any one of claims 6 . The water heater according to any one of claims 1 to 7 , wherein the filter part is a filter containing activated carbon as an adsorbent. The pouring pipeline further has a silver ion generator that generates silver ions,
The water heater according to any one of claims 1 to 8 , wherein the silver ion generator is arranged upstream of the filter section. 10. The water heater according to claim 9 , wherein said controller is configured to operate said silver ion generator each time said hot water filling operation is performed a predetermined number of times. 10. The water heater according to claim 9 , wherein the controller is configured to reactivate the silver ion generator after a second period of time has passed since the most recent operation of the silver ion generator.

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