JP2021105486A - Bath device with reheating function - Google Patents

Abstract

To efficiently improve water quality of hot water in a bathtub by irradiating the hot water with ultraviolet rays in a bath device with a reheating function.SOLUTION: In the bath device with the reheating function, when a water quality improvement operation for irradiating hot water with ultraviolet rays from ultraviolet ray irradiation means 8 while passing the hot water through a reheating circulation pipe line 63 by driving a circulating pump 63c is executed, the circulating pump 63c is driven so that a flow rate for water quality improvement is lower than a flow rate of the hot water that passes through the reheating circulation pipe line 63 when a reheating operation is executed.SELECTED DRAWING: Figure 1

Description

The present invention relates to a bath device with a reheating function that reheats hot water in a bathtub. In particular, the present invention relates to a bath device with a reheating function that irradiates hot water with ultraviolet rays to perform a water quality improving operation in order to improve the water quality of the hot water.

In order to reduce the odor of chlorine, the bathtub and the ultraviolet irradiation means are connected by a circulation circuit, and the hot water in the bathtub circulating in the circulation circuit is irradiated with ultraviolet rays to cause hypochlorous acid and hypochlorite, which are the causes of the odor of chlorine. A bath water purification device that decomposes chlorite ions to improve water quality has been proposed (for example, Patent Document 1).

In addition, the reheating circulation pipe is conventionally connected to the bathtub, the hot water in the bathtub is taken out by the circulation pump provided in the reheating circulation pipe, and the hot water is set by the heating means while circulating the reheating circulation pipe. A bath device with a reheating function that executes a reheating operation for raising the temperature to a temperature is known (for example, Patent Document 2). Therefore, if an ultraviolet irradiation means is provided in the reheating circulation pipe with the bath device with a reheating function as described above and the hot water in the bathtub circulating in the reheating circulation pipe is irradiated with ultraviolet rays, the water quality of the hot water in the bathtub Can be improved.

Japanese Unexamined Patent Publication No. 2003-10858 Japanese Unexamined Patent Publication No. 2014-85059

By the way, since the distance and the height difference between the bathtub and the heating means differ depending on the installation environment, the length and diameter of the pipes constituting the reheating circulation pipeline differ. Therefore, the piping resistance of the reheating circulation pipeline differs depending on the installation environment, and even if the circulation pump is rotated at the same rotation speed, the flow rate of the circulating hot water changes. On the other hand, in the reheating operation, the hot water in the bathtub is circulated in the reheating circulation pipe and heated by the heating means. Therefore, if the flow rate of the hot water flowing through the reheating circulation pipe is too small, the hot water becomes hot by the heating means. There is a problem that hot water that is heated to a temperature higher than the set temperature is sent to the bathtub. Therefore, regardless of the installation environment, at least the amount of on-water can be obtained with the water flow switch provided in the reheating circulation pipeline so that hot water circulates in the reheating circulation pipeline at a certain flow rate or higher during the reheating operation. A circulation pump with liquid capacity is used.

However, in order to decompose hypochlorous acid and hypochlorite ions contained in hot water by ultraviolet rays, it is necessary to irradiate the hot water with ultraviolet rays for a certain period of time or longer. Therefore, when hot water is circulated in the reheating circulation pipeline at the flow rate of hot water in the reheating operation as described above, there is a problem that hypochlorous acid and hypochlorite ions are not sufficiently decomposed.

The present invention has been made to solve the above problems, and an object of the present invention is to irradiate hot water with ultraviolet rays in a bath device with a reheating function to efficiently improve the quality of hot water in the bathtub. To do.

According to one aspect of the invention
A reheating circulation pipe that circulates hot water in the bathtub and
A variable flow rate circulation pump installed in the reheating circulation line,
An ultraviolet irradiation means that is installed in the reheating circulation pipeline and irradiates the hot water flowing through the reheating circulation pipeline with ultraviolet rays in order to improve the water quality of the hot water.
Equipped with control means for performing reheating operation and water quality improvement operation,
When the control means executes a water quality improvement operation in which the hot water is irradiated with ultraviolet rays from the ultraviolet irradiation means while the hot water is circulated in the reheating circulation pipeline by driving the circulation pump, the reheating circulation is performed when the reheating operation is executed. Provided is a bath device with a reheating function that drives a circulation pump so that the flow rate for improving water quality is smaller than the flow rate of hot water flowing through the pipeline.

According to the above-mentioned bath device with a reheating function, since a circulation pump with a variable flow rate is provided in the reheating circulation pipeline, the flow rate of hot water flowing through the reheating circulation pipeline during the reheating operation and the water quality improvement operation. Can be changed. Then, according to the above-mentioned bath device with a reheating function, when the water quality improvement operation is executed, the flow rate for improving the water quality is smaller than the flow rate of the hot water flowing through the reheating circulation pipe when the reheating operation is executed. Since the circulation pump is driven, hypochlorous acid and hypochlorite ions contained in hot water can be efficiently decomposed.

Preferably, the above-mentioned bath device with a reheating function further
It is equipped with a water flow switch that is installed in the reheating circulation pipeline and detects the flow of hot water flowing through the reheating circulation pipeline.
The water flow switch is configured to detect a predetermined on-water volume and a predetermined off-water volume less than the on-water volume.
When executing the reheating operation, the control means drives the circulation pump so that the flow rate of the hot water flowing through the reheating circulation line becomes at least the flow rate of the hot water whose on-water amount is detected by the water flow switch.
When executing the water quality improvement operation, once the circulation pump is driven so that the flow rate of the hot water flowing through the reheating circulation pipeline becomes the flow rate of the hot water whose on-water amount is at least detected by the water flow switch, then the water flow switch is used. The circulation pump is driven so as to reduce at least the flow rate of hot water at which the amount of off water is detected, and when the amount of off water is detected by the water flow switch, the circulation pump is driven so as to maintain the rotation speed.

According to the above-mentioned bath device with a reheating function, when executing the water quality improvement operation, the circulation pump is such that the flow rate of the hot water flowing through the reheating circulation pipe is at least the flow rate of the hot water whose on-water amount is detected by the water flow switch. Once driven, the circulation pump is driven so that the flow rate of hot water is reduced to at least the amount of hot water detected by the water flow switch, and when the amount of off water is detected by the water flow switch, the circulation is maintained. Since the pump is driven, the water quality is improved while the hot water is circulated to the reheating circulation pipeline at an appropriate water quality improvement flow rate that is smaller than the reheating flow rate by a single water flow switch without installing multiple expensive water flow switches. Can perform driving.

Further, according to the above-mentioned bath device with a reheating function, when the reheating operation is executed, the flow rate of the hot water flowing through the reheating circulation pipeline is set to the flow rate of the hot water whose on-water amount is at least detected by the water flow switch. Since the circulation pump is driven, it is possible to prevent hot water from being sent to the bathtub.

Preferably, in the above-mentioned bath device with a reheating function,
The reheating circulation pipeline is equipped with a return pipe that draws hot water from the bathtub and an outgoing pipe that sends hot water to the bathtub.
The ultraviolet irradiation means is provided in the outbound pipe of the reheating circulation pipe.

When hot water is irradiated with ultraviolet rays to decompose hypochlorous acid and hypochlorite ions, ozone is generated, and the resin and rubber products provided at the connection parts of the pipes that make up the reheating circulation pipeline deteriorate. There is a risk of However, according to the above-mentioned bath device with a reheating function, since the ultraviolet irradiation means is provided in the outbound pipe of the reheating circulation pipeline that sends hot water to the bathtub, even if ozone is generated, it is inside the bath device. It is sent to the bathtub without staying for a long time. As a result, deterioration of the resin and rubber products in the bath device can be suppressed.

According to other aspects of the invention
A reheating circulation pipe that circulates hot water in the bathtub and
A circulation pump installed in the reheating circulation line and
A parallel pipeline connected to the reheating circulation pipeline so that the hot water flows in parallel with the hot water flowing through the reheating circulation pipeline,
An ultraviolet irradiation means that is installed in a parallel pipeline and irradiates the hot water flowing through the parallel pipeline with ultraviolet rays in order to improve the quality of the hot water.
A constant flow rate that is provided in the parallel pipeline and controls the flow rate of hot water flowing through the parallel pipeline to a constant flow rate for improving water quality that is less than the flow rate of hot water flowing through the reheating circulation pipeline when the reheating operation is executed. Control means and
A bath device with a reheating function is provided, which comprises a control means for executing a reheating operation and a water quality improvement operation.

According to the above-mentioned bath device with a reheating function, a parallel pipeline is connected to the reheating circulation pipeline so that the hot water flows in parallel with the hot water flowing through the reheating circulation pipeline. The ultraviolet irradiation means that irradiates the hot water flowing through the parallel pipeline with ultraviolet rays to improve the water quality of the hot water, and the flow rate of the hot water flowing through the parallel pipeline are reheated circulation pipelines during the reheating operation. Since a constant flow rate control means is provided to control the flow rate of hot water flowing through the reheating circulation pipeline to a constant flow rate for improving water quality, even if the flow rate of hot water flowing through the reheating circulation pipe is larger than the flow rate for improving water quality. , The flow rate of hot water flowing through the parallel pipeline irradiated with ultraviolet rays can be controlled to the flow rate for improving water quality. Therefore, according to the above-mentioned bath device with a reheating function, hypochlorous acid contained in hot water can be efficiently contained by using an inexpensive circulation pump driven at a fixed rotation speed without providing a circulation pump with a variable flow rate. It can decompose acids and hypochlorite ions.

Preferably, the above-mentioned bath device with a reheating function further
It is equipped with a water flow switch that is installed in the reheating circulation pipeline and detects the flow of hot water flowing through the reheating circulation pipeline.
The water flow switch is configured to detect a predetermined amount of on-water.
When executing the reheating operation, the control means drives the circulation pump so that the flow rate of the hot water flowing through the reheating circulation line becomes at least the flow rate of the hot water whose on-water amount is detected by the water flow switch.
During the reheating operation in which the on-water amount is detected by the water flow switch, the ultraviolet irradiation means is operated to execute the water quality improvement operation.

According to the above-mentioned bath device with a reheating function, even if the flow rate of the hot water flowing through the reheating circulation pipeline is large, the flow rate of the hot water flowing through the parallel pipeline can be controlled to the flow rate for improving the water quality. It is possible to execute the water quality improvement operation during the burning operation. As a result, the heated hot water is irradiated with ultraviolet rays, so that the decomposition reaction is promoted, and hypochlorous acid and hypochlorite ions contained in the hot water can be more efficiently decomposed.

Preferably, in the above-mentioned bath device with a reheating function,
The reheating circulation pipeline is equipped with a return pipe that draws hot water from the bathtub and an outgoing pipe that sends hot water to the bathtub.
The parallel pipeline is connected to the outgoing pipe of the reheating circulation pipeline.

According to the above-mentioned bath device with a reheating function, the parallel pipeline provided with the ultraviolet irradiation means is connected to the outgoing pipe of the reheating circulation pipeline that sends hot water to the bathtub, so even if ozone is generated. , It is sent to the bathtub without staying inside the bathtub for a long time. As a result, deterioration of the resin and rubber products in the bath device can be suppressed.

As described above, according to the present invention, hypochlorous acid and hypochlorite ions contained in hot water can be efficiently decomposed in the bathing apparatus with a reheating function.

FIG. 1 is a schematic configuration diagram showing an example of a bath device with a reheating function according to the first embodiment of the present invention. FIG. 2 is a graph showing the relationship between the flow rate of hot water and the concentration of free residual chlorine in the bath device with a reheating function according to the first embodiment of the present invention. FIG. 3 is a flowchart showing an example of a control operation of the bath device with a reheating function according to the first embodiment of the present invention. FIG. 4 is a schematic configuration diagram showing an example of a bath device with a reheating function according to the second embodiment of the present invention. FIG. 5 is a flowchart showing an example of a control operation of the bath device with a reheating function according to the second embodiment of the present invention.

(Embodiment 1)
Hereinafter, the bath device with a reheating function according to the present embodiment will be specifically described with reference to the attached drawings.
FIG. 1 is a schematic configuration diagram showing an example of a bath device with a reheating function of the present embodiment applied to a bath water heater having a hot water supply function, a hot water filling function, and a reheating function. As shown in FIG. 1, the bath device with a reheating function according to the present embodiment includes a can body 1. A hot water supply burner 21 and a reheating burner 22 are housed in the lower part of the can body 1, and a hot water supply heat exchanger 31 and reheating are heated in the upper part of the can body 1. A reheating heat exchanger 32 heated by the burner 22 is housed. The space in which the hot water supply burner 21 and the heat exchanger 31 are arranged and the space in which the reheating burner 22 and the heat exchanger 32 are arranged are partitioned by a partition wall 11. Further, a combustion fan 4 for supplying combustion air to the burners 21 and 22 is connected to the lower surface of the can body 1, and an exhaust port 12 is provided at the upper end of the can body 1.

A solenoid valve 5a and a proportional valve 5b are interposed in the gas supply path 5 for supplying fuel gas to the burners 21 and 22. Further, the plurality of unit burners constituting the hot water supply burner 21 are divided into three sets, and a solenoid valve for capacity switching is provided in the branch gas supply path 51 to each set of unit burners branching downstream of the proportional valve 5b. Each of 51a is interposed, and an electromagnetic valve 52a is interposed in a branch gas supply path 52 to a reheating burner 22 that branches downstream of the proportional valve 5b.

The hot water supply heat exchanger 31 includes a main heat exchanger 31a that recovers the sensible heat of the combustion gas from the burner 21, and an auxiliary heat exchanger 31b that recovers the latent heat of the combustion gas that has passed through the main heat exchanger 31a. Has been done. Similarly, the reheating heat exchanger 32 is composed of a main heat exchanger 32a and an auxiliary heat exchanger 32b. A water supply pipe 61 and a hot water outlet pipe 62 are connected to the hot water supply heat exchanger 31, and a reheating circulation pipe line 63 connected to the bathtub 7 is connected to the reheating heat exchanger 32. The downstream end of the hot water outlet pipe 62 is connected to a hot water supply terminal (not shown).

The water supply pipe 61 is provided with a water supply water amount sensor 61a and a water amount servo 61b. Further, a bypass pipe 64 that joins the hot water outlet pipe 62 without passing through the hot water supply heat exchanger 31 is branched and connected to the water supply pipe 61 on the downstream side of the water amount servo 61b. A bypass servo 64a is provided at the branching point of the bypass pipe 64, and a hot water thermistor 62a is provided on the hot water discharge pipe 62.

The reheating circulation pipe 63 includes an outgoing pipe 631 that sends hot water that has passed through the reheating heat exchanger 32 to the bathtub 7, and a return pipe 632 that returns the hot water in the bathtub 7 to the reheating heat exchanger 32. Has been done. One end of the forward pipe 631 and the return pipe 632 on the bathtub 7 side is connected to a circulation fitting provided near the bottom inside the bathtub 7, respectively.

In the outgoing pipe 631, an ultraviolet irradiation unit 8 which is an ultraviolet irradiation means and an outbound thermistor 63a are provided in order from the upstream heat exchanger 32 side for reheating. Further, the return pipe 632 is provided with a return thermistor 63b, a circulation pump 63c, a water level sensor 63d, and a water flow switch 63e in order from the upstream bathtub 7 side. Therefore, by driving the circulation pump 63c, the hot water in the tub 7 is circulated between the tub 7 and the reheating heat exchanger 32 which is a heating means via the reheating circulation pipe 63, and is used for reheating. By burning the burner 22 and heating the hot water circulating in the reheating circulation pipe 63 with the reheating heat exchanger 32, the hot water in the bathtub 7 is reheated.

A hot water filling pipe 65 branched from a hot water outlet pipe 62 on the downstream side of the confluence of the bypass pipe 64 is connected to the return pipe 632 between the bathtub 7 and the circulation pump 63c. The hot water filling pipe 65 is provided with a hot water filling solenoid valve 65a and a hot water filling water amount sensor 65b for detecting the flow rate of hot water flowing through the hot water filling pipe 65. Therefore, by opening the hot water filling electromagnetic valve 65a without driving the circulation pump 63c, the hot water heated by the hot water supply heat exchanger 31 passes through the hot water filling pipe 65, the return pipe 632, and the outgoing pipe 631. It is supplied to the bathtub 7 and filled with hot water in the bathtub 7.

The ultraviolet irradiation unit 8 provided in the outgoing pipe 631 has a housing 80 provided so that hot water can flow inside, and a UV lamp 81 housed in the housing 80. Therefore, the flow path in the housing 80 of the ultraviolet irradiation unit 8 constitutes a part of the reheating circulation line 63. The UV lamp 81 is covered with a cover body through which ultraviolet rays having a wavelength at which hypochlorous acid and hypochlorite ions exhibit high absorbance are transmitted. A plurality of ultraviolet irradiation units 8 may be provided in the reheating circulation pipeline 63.

Although not shown, the water flow switch 63e provided in the return pipe 632 is provided in the main body case and the main body case, and when hot water is circulated through the reheating circulation pipe 63, it is pushed by the water flow and swings upward. It is provided with a water flow response lever and a detection switch that detects an upward swing of the water flow response lever. The water flow response lever is equipped with a weight plate having an appropriate weight so as to detect a predetermined on-water amount and a predetermined off-water amount, which will be described later.

The circulation pump 63c provided in the return pipe 632 is composed of a flow rate variable pump driven by a DC motor, and by changing the rotation speed of the motor according to a control signal from the controller 10, a reheating circulation pipe is provided. The flow rate of hot water flowing through 63 is increased or decreased.

The combustion fan 4, solenoid valve 5a, proportional valve 5b, solenoid valve 51a, 51a, 51a, 52a, water volume servo 61b, circulation pump 63c, bypass servo 64a, hot water filling solenoid valve 65a, UV lamp 81 of the ultraviolet irradiation unit 8 , It is controlled by the controller 10 of the bath device. Detection signals from the water supply water amount sensor 61a, the hot water discharge thermistor 62a, the outward route thermistor 63a, the return route thermistor 63b, the water level sensor 63d, the water flow switch 63e, the hot water filling water amount sensor 65b, and the like are input to the controller 10. According to the operation control program, the controller 10 drives the circulation pump 63c to circulate the hot water in the bathtub 7 to the reheating circulation pipe 63, and heats the reheating operation to a predetermined set temperature by the reheating heat exchanger 32. In addition, the circulation pump 63c is driven to reheat the hot water in the bathtub 7 and circulate it in the circulation pipe 63, and the ultraviolet irradiation unit 8 is configured to execute the water quality improvement operation of irradiating the hot water with ultraviolet rays. There is. Therefore, in the present embodiment, the controller 10 that executes the reheating operation and the water quality improving operation constitutes the control means. Further, the controller 10 is provided with a remote controller (not shown) provided with a reheating operation switch that can be operated to instruct the reheating operation and a water quality improvement operation switch that can be operated to instruct the water quality improvement operation. Is connected so that it can communicate.

When the reheating operation is executed by the bath device with the reheating function of the present embodiment, when the user turns on the reheating operation switch of the remote controller, the controller 10 drives the circulation pump 63c at a predetermined high rotation speed. , The hot water in the bathtub 7 is circulated in the reheating circulation pipe 63. Then, when the on-water amount is detected by the water flow switch 63e, the solenoid valve 52a is opened to start the combustion of the reheating burner 22, and the temperature of the hot water detected by the outbound thermistor 63a is set by the remote controller. Heat the hot water so that it reaches the set temperature of. In the reheating operation, it is necessary to raise the temperature of the hot water in the bathtub 7 to the set temperature within a short time. Therefore, regardless of the installation environment, the flow rate of the hot water flowing through the reheating circulation pipe 63 is generally 3. The circulation pump 63c is driven at a high rotation speed so that the reheating flow rate is in the range of 0 to 10.0 L / min.

By the way, the concentration of hypochlorous acid and hypochlorite ion contained in hot water that causes chlorine odor and irritation to the skin can be evaluated by measuring the free residual chlorine concentration. FIG. 2 shows the relationship between the flow rate of hot water and the concentration of free residual chlorine when one pass of hot water is circulated through the reheating circulation pipe 63 while irradiating the hot water with ultraviolet rays.

As shown in FIG. 2, when hot water is circulated at a high flow rate such as a reheating flow rate, hypochlorous acid and hypochlorite ions are not sufficiently decomposed by ultraviolet rays, and the free residual chlorine concentration is slightly reduced. It turns out that. Further, at a flow rate of hot water of 7.0 L / min or more, the free residual chlorine concentration hardly decreases. Therefore, in the present embodiment, when the water quality improvement operation is executed, the circulation pump 63c is driven so that the water quality improvement flow rate is smaller than the reheating flow rate. In particular, when the flow rate of hot water is 2.0 L / min or less, hypochlorous acid and hypochlorite ions can be efficiently decomposed. On the other hand, if the flow rate of hot water is too small, a long time is required for the water quality improvement operation. Further, as shown in FIG. 2, when the flow rate of hot water drops below a certain flow rate, the decomposition effect by ultraviolet rays is saturated. Therefore, the flow rate of hot water is preferably 1.0 L / min or more.

Next, with reference to FIG. 3, an example of the control operation when the water quality improvement operation is executed by the bath device with the reheating function of the present embodiment will be described.
When the user turns on the water quality improvement operation switch of the remote controller, the controller 10 drives the circulation pump 63c at a predetermined initial rotation speed (step S1). This initial rotation speed is set to a rotation speed at which a flow rate of hot water of at least the on-water amount (for example, 3.0 L / min) or more can be obtained by the water flow switch 63e regardless of the installation environment. Once the on-water amount is detected by the water flow switch 63e (Yes in step S2), the controller 10 reduces the flow rate of hot water until the off-water amount (for example, 2.0 L / min) is detected by the water flow switch 63e. As described above, the rotation speed of the circulation pump 63c is gradually decreased (step S3). Then, when the off-water amount is detected by the water flow switch 63e (Yes in step S4), the controller 10 drives the circulation pump 63c so as to hold the rotation speed at which the off-water amount is detected, and the hot water in the bathtub 7 is maintained. Is circulated in the reheating circulation line 63 (step S5). The water quality improvement flow rate in the present embodiment is set to a flow rate smaller than the off water amount after the on water amount is once detected by the water flow switch 63e, so that even if the on water amount is detected by the water flow switch 63e. , It is configured so that the combustion of the reheating burner 22 is not started.

When the off-water amount is detected by the water flow switch 63e and the circulation pump 63c is driven while maintaining a predetermined rotation speed, the controller 10 starts irradiation of ultraviolet rays by the UV lamp 81, and a predetermined operation time elapses. The water quality improvement operation is executed until the water quality is improved (steps S6 to S7). As a result, hypochlorous acid and hypochlorite ions contained in the hot water in the bathtub 7 are decomposed. When the predetermined operation time elapses, the irradiation of ultraviolet rays by the UV lamp 81 and the drive of the circulation pump 63c are stopped to end the water quality improvement operation (step S8).

According to the above embodiment, since the circulation pump 63c having a variable flow rate is provided in the reheating circulation pipe 63, the flow rate of the hot water flowing through the reheating circulation pipe 63 in the reheating operation and the water quality improvement operation. Can be changed. Then, according to the present embodiment, when the water quality improvement operation is executed, the water quality is circulated so as to be smaller than the flow rate of the hot water flowing through the reheating circulation pipe 63 when the reheating operation is executed. Since the pump 63c is driven, hypochlorous acid and hypochlorite ions contained in hot water can be efficiently decomposed regardless of the installation environment.

When hot water is circulated in the reheating circulation pipeline 63 at a flow rate for improving water quality that is smaller than the flow rate for reheating, a water flow switch for reheating that detects a high flow rate and a water flow for improving water quality that detects a low flow rate are used. It is also conceivable to provide two water flow switches. However, according to the present embodiment, when the water quality improvement operation is executed, the flow rate of the hot water flowing through the reheating circulation pipe 63 is circulated so as to be at least the flow rate of the hot water whose on-water amount is detected by the water flow switch 63e. After driving the pump 63c once, the circulation pump 63c is driven so that the flow rate of hot water at least the amount of off-water is detected by the water flow switch 63e is reduced, and when the amount of off-water is detected, the rotation speed at that time is maintained. Since the circulation pump 63c is driven so as to be performed, the on-water flow rate of the water flow switch 63e is set to an appropriate flow rate for the reheating flow rate, and the off-water flow rate is set to an appropriate flow rate for the water quality improvement flow rate. It is possible to execute the water quality improvement operation while circulating hot water to the reheating circulation pipe 63 at a flow rate smaller than the reheating flow rate by the single water flow switch 63e without providing a plurality of switches.

Further, since the piping resistance of the reheating circulation pipe 63 differs depending on the installation environment, the rotation speed of the circulation pump 63c in which the off-water amount is detected differs even if the circulation pumps 63c having the same performance are used. Therefore, the rotation rate of the circulation pump 63c in which the off-water amount is detected may be set in advance in consideration of all the installation environments so that the flow rate of the hot water flowing through the reheating circulation line 63 becomes the flow rate for improving the water quality. However, according to the present embodiment, since the flow rate at which the off-water amount is detected by the water flow switch 63e is set to the water quality improvement flow rate, the water quality improvement operation can be performed at an appropriate water quality improvement flow rate regardless of the installation environment. Can be executed.

Further, according to the present embodiment, when the reheating operation is executed, the flow rate of the hot water flowing through the reheating circulation pipeline 63 is circulated so as to be at least the flow rate of the hot water whose on-water amount is detected by the water flow switch 63e. Since the pump 63c is driven, it is possible to prevent hot water from being sent to the bathtub 7.

Further, when hot water is irradiated with ultraviolet rays to decompose hypochlorous acid and hypochlorite ions, ozone is generated, and the connection portion between the piping constituting the reheating circulation pipeline 63 and the reheating heat exchanger 32. There is a risk that the resin and rubber products provided in the above will deteriorate. However, according to the present embodiment, since the ultraviolet irradiation unit 8 is provided in the outgoing pipe 631 of the reheating circulation pipe 63 that sends hot water to the bathtub 7, even if ozone is generated, the bathtub 7 is swiftly provided. Is sent to. As a result, deterioration of the resin and rubber products in the bath device can be suppressed.

(Embodiment 2)
The bath device with a reheating function of the present embodiment is provided with a parallel pipeline in which the hot water flows in parallel with the hot water flowing in the reheating circulation pipeline, and the parallel pipeline is provided with an ultraviolet irradiation means and a constant flow rate control. It has the same configuration as the bath device with a reheating function according to the first embodiment, except that the means is provided and a circulation pump having a fixed rotation speed is used. Therefore, the same configuration as that of the first embodiment will be given the same reference number and the description thereof will be omitted.

As shown in FIG. 4, the return pipe 632 is provided with a circulation pump 63 g driven at a constant rotation speed. As the circulation pump 63 g, a pump having a liquid feeding capacity capable of obtaining a predetermined reheating flow rate similar to that of the first embodiment when driven at a constant rotation speed is used regardless of the installation environment.

A parallel pipe line 68 is branched and connected to the outgoing pipe 631. Therefore, when the circulation pump 63 g is driven, a part of the hot water flowing through the reheating circulation pipe 63 is diverted from the upstream connection portion of the parallel pipe 68 to the parallel pipe 68 in the parallel pipe 68. Hot water flows from the downstream connection portion of the parallel pipe line 68 so as to return to the reheating circulation line 63.

In the parallel pipeline 68, a constant flow rate control means for controlling the flow rate of the hot water flowing through the parallel pipeline 68 in order from the upstream side so as to be a predetermined flow rate for improving water quality (for example, 2.0 L / min). The water governor 9 and the ultraviolet irradiation unit 8 are interposed. Therefore, the flow path in the housing 80 of the ultraviolet irradiation unit 8 constitutes a part of the parallel pipeline 68, and the circulation pump is such that the flow rate of the hot water flowing through the reheating circulation pipeline 63 becomes the flow rate for reheating. Even if 63 g is driven, hot water having a flow rate for improving water quality, which is smaller than the flow rate for reheating, flows through the ultraviolet irradiation unit 8. Therefore, the water quality improvement operation can be executed during the reheating operation.

FIG. 5 is a flowchart showing an example of a control operation in the bath device with a reheating function according to the present embodiment.
When the user turns on the reheating operation switch of the remote controller and then turns on the water quality improvement operation switch, the controller 100 drives the circulation pump 63g at a constant rotation speed, and the reheating circulation line 63 is connected to the reheating operation line 63 in the bathtub 7. The hot water is circulated (step S21). Then, when the on-water amount is detected by the water flow switch 63e (Yes in step S22), the solenoid valve 52a is opened to start the combustion of the reheating burner 22 (step S23), and the detection is detected by the outbound thermistor 63a. The hot water is heated so that the temperature of the hot water reaches a predetermined set temperature.

When the reheating operation is started as described above, the controller 100 starts irradiation of ultraviolet rays by the UV lamp 81, and the water quality improving operation is executed until the reheating operation is completed (step 24). When the temperature of the hot water detected by the outbound thermistor 63a reaches the predetermined set temperature set by the remote controller, the combustion of the reheating burner 22, the irradiation of ultraviolet rays by the UV lamp 81, and the drive of the circulation pump 63g are stopped to add. The burning operation and the water quality improvement operation are completed (steps S25 to S26).

According to the above embodiment, the parallel pipeline 68 is connected to the reheating circulation pipeline 63 so that the hot water flows in parallel with the hot water flowing through the reheating circulation pipeline 63, and the parallel pipeline 68 is connected to the parallel pipeline 68. , The flow rate of the ultraviolet irradiation unit 8 that irradiates the hot water flowing through the parallel pipe 68 with ultraviolet rays to improve the water quality of the hot water and the flow rate of the hot water flowing through the parallel pipe 68 are added when the reheating operation is performed. Since the water governor 9 is provided to control the flow rate for improving water quality to be smaller than the flow rate of hot water flowing through the reheating circulation pipe 63, the flow rate of hot water flowing through the reheating circulation pipe 63 is for improving water quality. Even if the flow rate is equal to or higher than the flow rate, the flow rate of hot water flowing through the parallel pipeline 68 irradiated with ultraviolet rays can be controlled to the flow rate for improving water quality. Therefore, according to the present embodiment, 63 g of an inexpensive fixed rotation speed circulation pump that is driven at a constant rotation speed without providing an expensive variable flow rate circulation pump is used for efficiency regardless of the installation environment. It is possible to decompose hypochlorous acid and hypochlorite ions contained in hot water.

Further, according to the present embodiment, even if the flow rate of the hot water flowing through the reheating circulation line 63 is large, the flow rate of the hot water flowing through the parallel line 68 can be controlled to the flow rate for improving the water quality. The water quality improvement operation can be executed during the reheating operation. As a result, the heated hot water is irradiated with ultraviolet rays, so that the decomposition reaction is promoted, and hypochlorous acid and hypochlorite ions contained in the hot water can be more efficiently decomposed.

Further, according to the present embodiment, since the parallel pipe line 68 provided with the ultraviolet irradiation unit 8 is connected to the outgoing pipe 631 of the reheating circulation pipe line 63 that sends hot water to the bathtub 7, ozone is emitted. Even if it occurs, it is promptly sent to the bathtub 7. As a result, deterioration of the resin and rubber products in the bath device can be suppressed.

(Other embodiments)
(1) In the above embodiment, a gas-liquid heat exchanger that is directly heated by a burner is used as the heating means. However, as the heating means, a liquid heat exchanger that heat-exchanges and heats the hot water in the bathtub that circulates in the reheating circulation pipe with the heat medium sent from the bath apparatus may be used.

(2) In the first embodiment, in order to obtain the flow rate for improving water quality, the flow rate of hot water is once increased until the on-water amount is detected, and then the circulation pump is stepwise until at least the off-water amount is detected. The number of revolutions of is reduced. However, the rotation speed of the circulation pump is gradually increased until the on-water amount is detected by the water flow switch, and when the on-water amount is detected, the rotation speed is a predetermined step before the on-water amount is detected by the water flow switch. The circulation pump may be driven so as to be.

(3) In the second embodiment, when the reheating operation is executed, hot water is circulated in the parallel pipeline. However, an on-off valve may be provided in the parallel pipeline, and when the water quality improvement operation is executed, the on-off valve may be opened so that hot water flows through the parallel pipeline. Further, the water flow switch may detect only the on-water amount.

(4) In the second embodiment, the parallel pipeline is branched and connected to the outgoing pipe. However, a parallel pipeline is formed by providing a bypass pipe that is branched and connected from the return pipe between the water level sensor and the water flow switch to the outgoing pipe, and by interposing a constant flow rate control means and an ultraviolet irradiation unit in the bypass pipe. You may.

8 Ultraviolet irradiation unit 10 Controller 63 Reheating circulation pipeline 63c, 63g Circulation pump 63e Water flow switch 68 Parallel pipeline

Claims (6)

A reheating circulation pipe that circulates hot water in the bathtub and
A variable flow rate circulation pump installed in the reheating circulation line,
An ultraviolet irradiation means that is installed in the reheating circulation pipeline and irradiates the hot water flowing through the reheating circulation pipeline with ultraviolet rays in order to improve the water quality of the hot water.
Equipped with control means for performing reheating operation and water quality improvement operation,
When the control means executes a water quality improvement operation in which the hot water is irradiated with ultraviolet rays from the ultraviolet irradiation means while the hot water is circulated in the reheating circulation pipeline by driving the circulation pump, the reheating circulation is performed when the reheating operation is executed. A bath device with a reheating function that drives a circulation pump so that the flow rate for improving water quality is less than the flow rate of hot water flowing through the pipeline. The bath device with a reheating function according to claim 1 further includes a bath device with a reheating function.
It is equipped with a water flow switch that is installed in the reheating circulation pipeline and detects the flow of hot water flowing through the reheating circulation pipeline.
The water flow switch is configured to detect a predetermined on-water volume and a predetermined off-water volume less than the on-water volume.
When executing the reheating operation, the control means drives the circulation pump so that the flow rate of the hot water flowing through the reheating circulation line becomes at least the flow rate of the hot water whose on-water amount is detected by the water flow switch.
When executing the water quality improvement operation, once the circulation pump is driven so that the flow rate of the hot water flowing through the reheating circulation pipeline becomes the flow rate of the hot water whose on-water amount is at least detected by the water flow switch, then the water flow switch is used. A bath device with a reheating function that drives the circulation pump so that the flow rate of hot water is reduced to at least the amount of hot water that is detected, and drives the circulation pump so that the number of rotations is maintained when the amount of off water is detected by the water flow switch. In the bath device with a reheating function according to claim 1 or 2.
The reheating circulation pipeline is equipped with a return pipe that draws hot water from the bathtub and an outgoing pipe that sends hot water to the bathtub.
The ultraviolet irradiation means is a bath device with a reheating function provided in the outbound pipe of the reheating circulation pipeline. A reheating circulation pipe that circulates hot water in the bathtub and
A circulation pump installed in the reheating circulation line and
A parallel pipeline connected to the reheating circulation pipeline so that the hot water flows in parallel with the hot water flowing through the reheating circulation pipeline,
An ultraviolet irradiation means that is installed in a parallel pipeline and irradiates the hot water flowing through the parallel pipeline with ultraviolet rays in order to improve the quality of the hot water.
A constant flow rate that is provided in the parallel pipeline and controls the flow rate of hot water flowing through the parallel pipeline to a constant flow rate for improving water quality that is less than the flow rate of hot water flowing through the reheating circulation pipeline when the reheating operation is executed. Control means and
A bath device with a reheating function, which comprises a control means for executing a reheating operation and a water quality improvement operation. The bath device with a reheating function according to claim 4 further includes a bath device with a reheating function.
It is equipped with a water flow switch that is installed in the reheating circulation pipeline and detects the flow of hot water flowing through the reheating circulation pipeline.
The water flow switch is configured to detect a predetermined amount of on-water.
When executing the reheating operation, the control means drives the circulation pump so that the flow rate of the hot water flowing through the reheating circulation line becomes at least the flow rate of the hot water whose on-water amount is detected by the water flow switch.
A bath device with a reheating function that activates the ultraviolet irradiation means to execute the water quality improvement operation during the reheating operation in which the amount of water on is detected by the water flow switch. In the bath device with a reheating function according to claim 4 or 5.
The reheating circulation pipeline is equipped with a return pipe that draws hot water from the bathtub and an outgoing pipe that sends hot water to the bathtub.
The parallel pipeline is a bath device with a reheating function that is connected to the outbound pipe of the reheating circulation pipeline.

Images