JP2017009258A - Hot water temperature control device and hot water temperature control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water temperature control device and a control method for supplying headspring from an upper part of a bathtub for a long time without mixing water.SOLUTION: A hot water temperature control device includes a first valve portion 11 and a second valve portion 12 for making flowing hot water join and flow out to a hot water supply port 4, the first valve portion 11 includes a first flow rate adjustment portion N1 for manually setting a flow rate of a flow channel, and a first opening/closing portion V1 for opening/closing the flow channel by a signal from a control portion 14, the second valve portion 12 includes a second flow rate adjustment portion N2 for manually setting a flow rate of the flow channel, and a second opening/closing portion V2 for opening/closing the flow channel by a signal from the control portion 14, a first lower limit temperature L2 and a first upper limit temperature H2 of hot water of a bathtub 3 are set to the control portion 14, and the control portion 14 keeps the opening of the flow channel of the first opening/closing portion V1 at least by a time when the temperature is over the first upper limit temperature H2, and switches the opening/closing of the flow channel of the second opening/closing portion V2 between the first lower limit temperature L2 and the first upper limit temperature H2.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a hot water temperature control device and a hot water temperature control method, and more particularly to a hot water temperature control device and a hot water temperature control method for supplying replenishing hot water from a hot water supply port provided above a bathtub.

  The method of always pouring replenished hot water from the top of the bathtub gives a feeling of being immersed in a flowing hot spring. For this reason, many hot springs use this method. The hot water in the bathtub is higher than the outside temperature, and the hot spring bathtub does not have a lid and dissipates heat when opened, so that the hot water naturally cools as it is. Therefore, the hot water temperature in the bathtub must be managed.

  The ideal way to prevent a drop in the hot water temperature is to supply an appropriate amount of hot water as it cools, but it is very difficult to do it with a flowing hot spring because of the influence of outside air temperature. In addition, when using a source spring, it is also affected by the pressure change of the source to be replenished, so it is very difficult to manage the hot water temperature using a flowing hot spring. Each hot spring inn measures the hot water temperature every two hours, for example. The flow rate is adjusted by adjustment, which is very labor intensive.

  Therefore, as shown in FIG. 1 of Patent Document 1 (Japanese Patent Laid-Open No. 2008-100018), there is a method in which the hot water temperature of the bathtub is detected by a temperature sensor and the inflow valve of hot water and cold water is automatically controlled to open and close. Conceivable.

JP 2008-100018 A

  However, Patent Document 1 mixes water in the hot water supplied to the bathtub. For this reason, there is a problem that the active ingredient as the hot spring of the source spring is diluted and a large amount of water is required. As a method for lowering the temperature of the source without diluting, a method using a heat exchanger and water can be considered, but this method is not preferable because it has disadvantages such as a large amount of water used, enlarging the equipment, and increasing the cost. .

  Moreover, the hot water temperature of the bathtub may deviate greatly from the desired temperature due to disturbance. Examples of disturbances include changes in the pressure of hot water and cold water accompanying changes in the amount of hot water such as shower use, changes in room temperature and temperature, changes in wind power, and changes in the number of bathers. When the hot water temperature of the bathtub greatly deviates from the desired temperature due to disturbance, there is a problem that it takes time until the hot water temperature of the bathtub reaches the set temperature.

  In addition, some guest rooms have recently set up a bathtub dedicated to the guest room where the target temperature can be set by the bather, but when the set temperature is changed, the hot water temperature in the bathtub will greatly deviate from the set temperature, There has been a demand for an inexpensive hot water temperature control device that can respond to changes in the set temperature in as short a time as possible. Furthermore, since the appropriate temperature that a person feels changes according to the season, the temperature is changed according to the season even for the same person.

  Then, an object of this invention is to provide the hot water temperature control apparatus and control method which can manage hot water temperature, without mixing water. It is another object of the present invention to provide a hot water temperature control device and a control method in which a hot water in a bathtub becomes a desired temperature in a short time even when there is a disturbance or a bather changes the temperature setting.

  In order to achieve the above object, the hot water temperature control device of the present invention provides hot water that supplies hot water, which is hotter than hot water in the bathtub, to a bathtub that dissipates heat from the hot water from a hot water supply port provided above the bathtub. A temperature control device, comprising a temperature sensor for detecting the temperature of the bathtub, a control unit, and a first valve unit and a second valve unit through which the respective hot water flows and flows out to the hot water supply port, The first valve unit includes a first flow rate adjustment unit that sets a flow rate of the flow channel, and a first opening / closing unit that opens / closes the flow channel according to a signal from the control unit, and the second valve unit includes a flow rate of the flow channel And a second opening / closing unit that opens / closes the flow path according to a signal from the control unit, and the control unit includes a first lower limit temperature L2 and a first upper limit temperature H2 of bathtub water. Is set, and the control unit at least opens the flow path of the first opening / closing unit. To above the upper limit temperature H2 is allowed to maintain, characterized in that to perform the switching of the opening / closing of the flow path of the second closing part between the said first lower limit temperature L2 first upper limit temperature H2.

  In the hot water temperature control apparatus according to the present invention, the first valve unit includes the first flow rate adjusting unit that sets the flow rate of the flow path. Therefore, in the replenishment state in which the first valve unit is opened and the second valve unit is closed. The amount of hot water can be set so that the drop in the hot water temperature in the bathtub due to heat radiation is small. In addition, since the second valve unit includes a second flow rate adjustment unit that sets the flow rate of the flow path, the hot water temperature of the bathtub rises in a replenishment state in which the first valve unit and the second valve unit are opened. In addition, the amount of hot water can be set.

  And since the hot water temperature control device sets the flow rate in this way, when the hot water temperature reaches the first upper limit temperature H2, only the hot water supplied from the first valve portion is provided. The temperature gradually decreases from the first upper limit temperature H2, but when the temperature decreases, the refilling hot water from the second valve portion is added, so the hot water temperature does not fall below the first lower limit temperature L2, and the first lower limit temperature L2 The hot water temperature can be maintained between the first upper limit temperature H2. Moreover, since only the refilling hot water from the 1st valve | bulb part in which the flow volume was set does not raise the hot water temperature of a bathtub, it can replenish continuously, and the satisfaction feeling immersed in the flowing hot spring becomes strong. In addition, since the heat dissipation amount of the hot water in the bathtub varies depending on the environment such as the place where the bathtub is installed and the season, the manager of the hot water temperature control device can control the flow rates of the first valve unit and the second valve unit according to the environment of the bathtub. Can be set each time. Further, since the valve control of the control unit is merely switching between open / close and does not require automatic flow control or PID control, a hot water temperature control device can be provided at a low cost.

  Moreover, in the hot water temperature control apparatus of this invention, it is preferable that the said control part closes the flow path of a said 1st opening / closing part by 2nd upper limit temperature H1 higher than said 1st upper limit temperature H2.

  The set temperature can be changed even by the bather, and when the bather is set very low by the bather, the hot water from the first valve portion is automatically stopped and the bath temperature can be lowered quickly.

  Further, the hot water temperature control apparatus of the present invention includes a third valve portion that joins the flowing hot water to the flowing water of the first valve portion and the second valve portion, and flows out to the hot water supply port. Comprises a third flow rate adjusting unit for setting the flow rate of the flow channel, and a third opening / closing unit for opening / closing the flow channel according to a signal from the control unit, and the control unit controls the flow path of the third open / close unit. It is preferable to close at a second lower limit temperature H3 lower than the first lower limit temperature L2.

As described above, since the third valve unit includes the third flow rate adjusting unit for setting the flow rate of the flow path, the source spring is provided so that the temperature rises quickly in the replenished state in which the first to third valve units are opened. The replenishment amount can be set. Thereby, when the temperature of the hot water of a bathtub falls below the 1st minimum temperature L2 by disturbance, the temperature rise of the hot water of a bathtub can be accelerated by the 3rd valve part. Further, since replenishment from the third valve portion is stopped at a temperature slightly lower than the first lower limit temperature L2 (for example, a temperature lower by 0.1 ° C.), overrun due to a response delay of the temperature sensor can be prevented.
Moreover, in the hot water temperature control apparatus of this invention, it is preferable to provide the pump part which guides the hot water of the bottom part in the said bathtub to the said hot water supply port.

  In the present invention, when the bather changes the setting very low, the changed set temperature becomes much lower than the hot water temperature of the bathtub, so that the replenishing hot water from the first to third valve portions does not come out of the hot water outlet. For this reason, satisfaction will fall. Not only that, there is no flow in the bathtub, the surface side is air-cooled to a low temperature, and a temperature difference from the bottom side occurs. For this reason, not only the temperature in a bathtub becomes non-uniform | heterogenous, but it will take time for cooling of a bathtub. If the temperature in the bathtub becomes uneven, correct temperature detection cannot be performed and inaccurate temperature control is performed. Therefore, in the present invention, the hot water at the bottom in the bathtub that is separated from the hot water outlet is caused to flow out of the hot water outlet, dissipate heat by being exposed to the outside air, and the hot water in the bathtub is stirred by the flow. Thereby, the hot water in a bathtub can be cooled quickly, temperature can be made uniform, and a bather can be given a hot spring feeling.

It is a block diagram which shows the structure of embodiment. It is a temperature chart which shows operation | movement of embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the embodiments and drawings. However, the embodiments shown below are not intended to limit the present invention to those described herein, and The invention can be equally applied to various modifications without departing from the technical idea shown in the claims. In addition, in each drawing used for the description in this specification, in order to make each member a size that can be recognized on the drawing, each member is displayed with a different scale, and is not necessarily actual. It is not displayed in proportion to the dimensions.

  The configuration of the hot water temperature control apparatus according to the embodiment of the present invention will be described with reference to FIG. The hot water temperature control device 1 according to the present embodiment is a device that supplies makeup hot water to a bathtub 3 installed in a private bathroom 2 in a guest room. A hot water supply port 4 for replenishing hot water is disposed above the bathtub 3. The hot water temperature control device 1 of this embodiment includes at least a first valve unit 11, a second valve unit 12, a third valve unit 13, a filter (strainer) S, a pump P, a control unit 14, an input unit 15, and a temperature sensor 16. It has.

  Sources merge through the first valve portion 11, the second valve portion 12, and the third valve portion 13 that are arranged in parallel, and flow out to the hot water supply port 4. Moreover, from the outflow port 31 provided in the bottom part of the hot water supply port 4 of the bathtub 3, the hot water of the bathtub 3 passes the filter S and the pump P, and the outflow source of the 1st-3rd valve parts 11-13 and its upstream. It merges and flows out to the hot water inlet 4. Hot water from the pump P flows from the upstream of the outflow source of the first to third valve portions 11 to 13. As a result, air can be vented when the first to third valve portions 11 to 13 are started. Moreover, the pressure of the pump P does not disturb the flow pressure in the direction of the hot water supply port 4 of the source.

  The first to third valve units 11 to 13 are first to third needle valves (first to third flow rate adjusting units) N1 to N3 that manually adjust the flow rates of the respective flow paths, and the flow paths are opened (ON). ) / First to third electric valves (first to third opening / closing parts) V1 to V3 for closing (OFF). The valve portion including the needle valve and the electric valve may be an electric valve with a needle in which these are integrated, but here, they are described separately in order to distinguish and explain the operation. The input unit 15 is means for manually inputting the desired temperature of the hot water in the bathtub 3, and the input information is transmitted to the control unit 14. The temperature sensor 16 is disposed below the hot water supply port 4 in the bathtub 3 to detect the temperature of the hot water, and the detected information is transmitted to the control unit 14. Since the heating from the hot water supply port 4 is little by little, the heating reaches the earlier direction, but the lower part of the hot water supply port 4 is a place where the temperature is unexpectedly stabilized and does not disturb the bather. The control unit 14 sets a threshold value such as an upper limit or a lower limit of the temperature control from the desired temperature input by the input unit 15, and controls opening / closing (ON / OFF) of the first to third valve units 11 to 13. Moreover, ON / OFF of the pump P is also controlled. The valve control of the control unit 14 is only switching between open / close and does not require automatic flow control or PID control, so that the hot water temperature control device 1 can be provided at low cost.

  Next, operation | movement of the hot water temperature control apparatus 1 of this embodiment is demonstrated using FIG. Since the bathtub 3 does not have a lid, the hot water temperature is lowered by heat radiation. For example, it is assumed that the temperature of the hot water in the bathtub 3 is an environment where the temperature drops by 0.35 ° C. in 10 minutes when there is no replenishing hot water near the appropriate temperature of the hot water. The flow rate of the first needle valve N1 is such that the hot water temperature in the bathtub 3 drops by 0.1 ° C. in 10 minutes with the pump P turned on, the second electric valve V2 turned off, and the third electric valve V3 turned off. It is manually set in advance. That is, although the hot water temperature of the bathtub 3 is cooled by the replenishment of the source only from the first valve unit 11, the temperature is not increased.

  The flow rate of the second needle valve N2 is such that the hot water temperature in the bathtub 3 rises by 0.1 ° C. in 10 minutes with the pump P turned on, the first electric valve V2 turned on, and the third electric valve V3 turned off. It is manually set in advance. That is, when the source from the second valve unit 12 is added to the source from the first valve unit 11, the hot water temperature of the bathtub 3 rises.

  The flow rate of the third needle valve N3 is such that the temperature of the hot water supplied from the hot water supply port 4 to the bathtub 3 is not burned with the pump P turned on, the first electric valve V2 turned on, and the second electric valve V3 turned on. It is manually set in advance so as to reach a hot water temperature of about (45 degrees or more if it is hot water in a bathtub that is not soaked for 1 hour).

  These manual flow rate settings are initially set according to the difference in the heat dissipation environment of the hot water in the bathtub 3, and are changed according to changes in the heat dissipation environment. Thus, since the water for lowering the temperature of the hot spring is not used to control the hot water temperature, the hot water of the bathtub 3 does not dilute the active ingredient of the hot spring. In this embodiment, the hot water of the bathtub 3 is added using the pump P to lower the temperature of the source spring. However, if the temperature of the source spring drawn into the hot spring is not so high, the hot water of the bathtub 3 may not be added. . In addition, the flow rate of the third needle valve N3 is set so that the hot water temperature is not burned by the hot water replenished from the hot water supply port 4 to the bathtub 3, but the flow rate of the third needle valve N3 is increased and replenished. The hot water supplied from the mouth 4 to the bathtub 3 may be a hot water temperature closer to the source. However, since there are people who directly touch the hot water supplied from the supply port 4, the flow rate of the third needle valve N3 is such that the hot water is not burned by the hot water supplied from the hot water supply port 4 to the bathtub 3. Setting is preferred.

  When the bather inputs a desired temperature to the input unit 15, the control unit 14 sets the first upper limit temperature H2 (for example, 42.0 ° C.) and the first target temperature range of the hot water temperature of the bathtub 3 based on this input. 1 Lower limit temperature L2 (for example, 41.8 degreeC) is set. At this time, let the hot water temperature of the bathtub 3 be the operation of the hot water temperature control device 1 from a state lower than L3 (for example, 41.6 ° C.) in FIG.

  The control unit 14 turns on the first to third electric valves V1 to V3 and the pump P of the first to third valve units 11 to 13, respectively. As a result, the temperature of the source spring that has passed through the first to third valve portions 11 to 13 is lowered to the extent that the hot water of the bathtub 3 drawn in by the pump P does not cause burns, and the hot water supply port 4 above the bathtub 3 is transferred to the bathtub 3. Hot water is supplied. In this way, all of the first to third valve portions 11 to 13 are opened, and the temperature of the hot water in the bathtub 3 is rapidly increased to the target temperature range.

  When the information from the temperature sensor 16 disposed in the bathtub 3 reaches a second lower limit temperature H3 (for example, 41.7 ° C.) that is slightly lower than the first lower limit temperature L2, the control unit 14 controls the third valve unit 13. The third electric valve V3 is turned off. At this time, the hot spring in the bathtub 3 that has passed through the first spring section 11 and the second valve 12 and the pump P is supplied to the bathtub 3. Thereby, the hot water temperature of the bathtub 3 rises by 0.1 ° C. in 10 minutes. In this way, the third valve portion 13 is used for accelerating the hot water temperature when the hot water temperature of the bathtub 3 is lower than the first lower limit temperature L2. The reason why the third valve portion 13 is closed at the second lower limit temperature H3 that is slightly lower than the first lower limit temperature L2 is that the temperature of the hot water in the bathtub 3 due to a delay in the response of the temperature sensor 16 or a large amount of hot water is replenished. This is to prevent the temperature rise of the hot water from exceeding the first lower limit temperature L2 due to unevenness (overrun).

  When the information from the temperature sensor 16 reaches the first upper limit temperature H2, the control unit 14 turns off the second electric valve V2 of the second valve unit 12. At this time, hot water in the bathtub 3 that has passed only the first valve portion 11 and the pump P is supplied to the bathtub 3. Thereby, the hot water temperature of the bathtub 3 falls 0.1 degreeC in 10 minutes. Since the replenishing hot water from the first valve portion 11 is continuously discharged, the replenishing amount from the hot water supply port 4 is increased, and the satisfaction of being immersed in the hot spring flowing through the source spring is strong. Moreover, since replenishment is continuing from the 1st valve | bulb part 11, the temperature fall of the hot water of the bathtub at this time becomes slight.

  When the information from the temperature sensor 16 reaches the first lower limit temperature L2, the control unit 14 turns on the second electric valve V2 of the second valve unit 12 again. At this time, the hot spring in the bathtub 3 that has passed through the first spring section 11 and the second valve 12 and the pump P is supplied to the bathtub 3. Thereby, the hot water temperature of the bathtub 3 rises 0.1 degreeC again in 10 minutes. In this way, the hot water temperature in the bathtub 3 is automatically maintained in a temperature range between the first lower limit temperature L2 and the first upper limit temperature H2.

  On the other hand, in a hot spring, since a rapid change may occur regarding the hot water temperature of the bathtub 3, the hot water temperature control apparatus 1 needs to cope with this rapid change. Specifically, for example, when another bather changes the setting to a very high temperature, or due to a disturbance such as a large number of bathers, the temperature of the hot water in the bathtub 3 becomes the third lower limit temperature L3 (for example, 41.6 When the temperature falls below [° C.], the control unit 14 turns on the third electric valve V3 of the third valve unit 13. Thereby, the hot water temperature control apparatus 1 opens all the 1st-3rd valve parts 11-13, and raises the hot water temperature of the bathtub 3 to a target temperature range rapidly. If the third valve portion 13 is not used at this time, the temperature rises by 0.1 ° C. in 10 minutes. For example, if the bather raises the temperature by 2 ° C., it will take 200 minutes. At this time, the source that has passed through the first to third valve portions 11 to 13 becomes a temperature at which the hot water of the bathtub 3 drawn in by the pump P is not burned, and from the hot water supply port 4 above the bathtub 3 to the bathtub 3. Hot water is supplied.

  Conversely, when another bather changes the setting to a very low temperature, or due to disturbance such as an increase in the source pressure, the hot water temperature of the bathtub 3 exceeds the first upper limit temperature H2 and the second upper limit temperature H1 (for example, 42.1 ° C.) or higher, the control unit 14 turns off the first electric valve V1 of the first valve unit 11. If the second valve portion 12 or the third valve portion 13 is turned on due to a sudden change in hot water temperature or the like at this time, both are turned off. In this way, the hot water supply of all the springs is closed and the hot water temperature of the bathtub 3 is rapidly lowered. At this time, only the hot water in the bathtub 3 that has passed through the pump P is supplied to the bathtub 3. If there is no hot water from the pump P, there will be no hot water flowing out from the hot water outlet 4, so the satisfaction of being immersed in the hot spring will worsen, but this satisfaction will not be impaired because there is hot water from the pump P. . Moreover, if there is no hot water supply from the pump P, there will be no flow in the bathtub 3, the surface side will be air-cooled and the temperature will be low, and a temperature difference from the bottom side will occur. For this reason, not only the temperature in the bathtub 5 becomes non-uniform | heterogenous but cooling of the bathtub 3 will take time. If the temperature in the bathtub 5 becomes uneven, correct temperature detection cannot be performed, and inaccurate temperature control is performed. Therefore, in the present embodiment, the hot water at the bottom in the bathtub 3 is caused to flow out of the hot water supply port, and the hot water in the bathtub 3 is stirred by the flow. Thereby, the temperature of the hot water in the bathtub 3 can be made uniform, and a bather can be satisfied. When the temperature of the hot water in the bathtub 3 drops and reaches a first lower limit temperature L1 (for example, 41.9 ° C.) within the set range, the control unit 14 controls the first and second electric motors of the first and second valve units 11 and 12. Turn on the valves V1 and V2. At this time, the hot spring in the bathtub 3 that has passed through the first spring section 11 and the second valve 12 and the pump P is supplied to the bathtub 3. Thereby, the hot water temperature of the bathtub 3 rises by 0.1 ° C. in 10 minutes. Thereafter, the hot water temperature of the bathtub 3 is automatically maintained from the first lower limit temperature L2 to the first upper limit temperature H2 under the control of the control unit 14 described above.

  As described above, the hot water temperature control device 1 of the present invention does not mix cold water (such as tap water or well water) into the replenishing hot water in order to lower the hot water temperature of the bathtub 3. For this reason, the active ingredient as the hot spring of the bathtub 3 is not diluted. In addition, the supply of the hot spring of the hot water temperature control device 1 of the present invention includes the basic first valve part 11 for flowing out the replenishing hot water, and the temperature for maintaining the hot water temperature of the bathtub 3 at the set temperature. A second valve portion 12 for adjustment and a third valve 13 for acceleration when it is desired to quickly raise the temperature due to a change in temperature setting or disturbance by the bather are provided. Thus, since it is easy to understand the three roles, it is easy to initialize the flow rate when the hot water temperature control device 1 is attached to various bathtubs 3 and to change the setting of the flow rate when the environment of the bathtub 3 changes. Since the flow rate of the first valve portion 11 is an amount until the hot water temperature of the bathtub 3 slightly drops, the flow rate is set to a large flow rate for continuous replenishment. This gives the bather continuous satisfaction. Further, the hot water temperature control device 1 of the present invention closes all the valve portions 11 to 13 to stop the heating by the source spring when the temperature setting of the bather is changed or the temperature is lowered quickly due to a disturbance, and the pump P remains on. To maintain. Thereby, stirring of the hot water of the bathtub 3 is maintained, and the hot water temperature of the bathtub 3 falls early.

  In addition, in this embodiment, although the hot water temperature control apparatus 1 is used for the bathtub 3 installed in the private bathroom 2 in a guest room, you may use it for the bathtub of the large communal bath where many people take a bath at once. . On the other hand, the number of inns that offer a sense of quality by providing a bathroom in the guest room is also increasing recently. In such a room, hot water temperature management is very important so as not to dissatisfy the user, but the bathroom provided in the guest room has a small bathtub, and it is like an open-air bath even in the bathroom. There are many. Therefore, although there are many difficulties in hot water temperature control such as a large change in hot water temperature due to the outside air temperature, the hot water temperature control device 1 of the present invention is very suitable for such hot water temperature control in a bathtub in a guest room.

  In the present embodiment, the hot water temperature control device 1 uses a source, but may be a heated source.

1: Hot water temperature control device 11: 1st valve part 12: 2nd valve part 13: 3rd valve part 14: Control part 15: Input part 16: Temperature sensor N1: 1st needle valve N2: 2nd needle valve N3: 3rd needle valve V1: 1st electric valve V2: 2nd electric valve V3: 3rd electric valve P: Pump 3: Bathtub 4: Hot water inlet

Claims (6)

A hot water temperature control device that supplies hot water that is hotter than hot water in the bathtub to a bathtub that radiates heat from the hot water from a hot water outlet provided above the bathtub,
A temperature sensor that detects the temperature of the bathtub, a control unit, and a first valve unit and a second valve unit that flow out of the hot water outlets by joining the flowing hot water,
The first valve unit includes a first flow rate adjusting unit that sets a flow rate of the flow channel, and a first opening / closing unit that opens / closes the flow channel according to a signal from the control unit,
The second valve unit includes a second flow rate adjusting unit that sets a flow rate of the flow channel, and a second opening / closing unit that opens / closes the flow channel according to a signal from the control unit,
A first lower limit temperature L2 and a first upper limit temperature H2 of bathtub water are set in the control unit,
The control section maintains the opening of the flow path of the first opening / closing section until at least the first upper limit temperature H2 is exceeded, and switches the opening / closing of the flow path of the second opening / closing section to the first lower limit temperature. A hot water temperature control apparatus characterized by being performed between L2 and the first upper limit temperature H2.   2. The hot water temperature control apparatus according to claim 1, wherein the control unit closes the flow path of the first opening / closing unit at a second upper limit temperature H <b> 1 higher than the first upper limit temperature H <b> 2. A third valve portion is provided to which the hot water merges with the flowing water of the first valve portion and the second valve portion and flows out to the hot water outlet.
The third valve unit includes a third flow rate adjusting unit that sets a flow rate of the flow channel, and a third opening / closing unit that opens / closes the flow channel according to a signal from the control unit,
2. The hot water temperature control apparatus according to claim 1, wherein the control unit closes the flow path of the third opening / closing unit at a second lower limit temperature H <b> 3 lower than the first lower limit temperature L <b> 2.   The hot water temperature control device according to claim 1, further comprising a pump portion that guides hot water at a bottom portion in the bathtub to the hot water supply port. By supplying hot water that is hotter than the hot water in the bathtub to the bathtub that dissipates heat from the hot water from the hot water supply port provided above the bathtub, the hot water temperature of the bathtub is maintained within a temperature range between the lower limit and the upper limit. A hot water temperature control method for controlling
A first valve portion and a second valve portion that flow out into the hot water supply port by joining the respective flowing hot water;
In the replenishment state in which the second valve part is closed, the outflow amount of the first valve part is adjusted so that the temperature of the hot water in the bathtub becomes a temperature drop,
In the replenishment state in which the first bubble part and the second valve part are opened, the outflow amount of the second valve part is adjusted so that the temperature of the hot water in the bathtub rises,
The first valve part is ON / OFF controlled to flow out at least until the hot water temperature of the bathtub exceeds the upper limit of the temperature range,
The hot water temperature control method, wherein the second valve portion is ON / OFF controlled so that the hot water temperature in the bathtub is in the temperature range only when the hot water temperature is in the temperature range.   When the hot water temperature in the bathtub exceeds the predetermined temperature range, the first valve unit is ON / OFF controlled so as to stop outflow until the hot water temperature in the bathtub reaches a predetermined temperature. The hot water temperature control method according to claim 5.

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