JP2009030972A - Hot water storage type hot-water supply bath - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water storage type hot-water supply bath capable of securely raising temperature of bathtub water to a target temperature for reheating the water or keeping the water warm in a short time as well as suppressing the running cost for reheating or heat-retention. <P>SOLUTION: At the time of reheating the bathtub water by raising its temperature to the target temperature, as assistance for raising the temperature, an indirect heat exchanger 17 side is closed by a three-way valve 23 and a bypass tube 22 is communicated with a bath circulating circuit 16 while hot water in a hot water storage tank 1 is poured from a hot water pouring pipe 24 through the bath circulating circuit 16 into the bathtub 3. Thus, raising temperature in a little temperature difference at the last step, taking much time in heat exchange, is performed by pouring high-temperature hot water, whereby raising temperature to the target hot water temperature can be surely performed in a short time. Further, it is unnecessary to operate H/P to boil water for supply of hot water and add the same for compensating for a heating value given from the indirect heat exchanger 17, which can suppress the running cost. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hot water storage hot water bath apparatus that performs reheating or keeping warm of hot water in a bathtub by indirect heat exchange with hot water stored in a hot water storage tank.

As a conventional technique in this type of hot water storage hot water bath apparatus, for example, in Patent Document 1, an indirect heat exchanger provided in a hot water storage tank is connected to a bath circulation circuit, and an electric heater is used using hot water in the hot water storage tank. The thing which made it possible to chase and keep warm of bathtub water without using etc. is disclosed.
Japanese Patent Laid-Open No. 11-83156

  However, in the above-described conventional technology, regardless of the amount of heat stored in the hot water storage tank, the heating operation is performed up to the reheating target hot water temperature, so the amount of hot water stored in the hot water storage tank is small or the hot water storage temperature is low. If the amount of heat stored is small, or the bath water temperature before reheating is extremely low or the amount of water is large, and the amount of heat necessary to raise the bath water to the target hot water temperature is large, Run short.

  Therefore, it is necessary to operate the heat pump unit (hereinafter referred to as H / P) to boil water for hot water supply even during daytime hours, and there is a problem that running cost is high. In addition, after the start of chasing, the bath water temperature rises and the hot water temperature in the hot water storage tank falls. And a heating capability will fall as the difference of bathtub hot water temperature and hot water storage hot water temperature becomes small. In this case, since it takes time to reach the heat exchanging position even if the boiling is increased, there is a problem that it takes more time to raise the temperature difference slightly after the end.

  The present invention has been made in view of the above-described problems of the prior art, and the purpose thereof is to reliably raise the temperature up to the target hot water temperature in the case of pursuing or keeping warm the bath water in a short time. Another object of the present invention is to provide a hot-water storage hot-water bath apparatus that can suppress running costs associated with chasing or keeping warm.

  In order to achieve the above object, the present invention employs technical means described in claims 1 to 6. That is, in the invention described in claim 1, when the bath water is heated up to the target temperature, the indirect heat exchanger (17) side is switched by the flow path switching means (23) as an auxiliary to the temperature increase. The bypass pipe (22) and the bath circulation circuit (16) are closed to communicate with each other, and hot water in the hot water storage tank (1) is passed from the hot water filling pipe (24) through the bath circulation circuit (16) into the bathtub (3). It is characterized by pouring hot water.

  According to the first aspect of the present invention, the hot water storage tank (1) is chased to the limit of the heat storage amount, or is chased to a state where the hot water can be reached to the target hot water temperature, and then the temperature is increased. By injecting hot water in the hot water storage tank (1) into the bathtub (3) as a temperature assist, the temperature can be raised to the target temperature in a short time and with certainty.

  Moreover, even if it is a case where it is obtained from heat exchange in the indirect heat exchanger (17) by the amount of heat necessary for temperature rise, the heat exchange increases the temperature with a slight temperature difference after the last time. By using high-temperature pouring hot water, the temperature can be raised to the target hot water temperature in a short time and reliably. Further, it is not necessary to operate the H / P to make up the hot water supply water to supplement the amount of heat given to the indirect heat exchanger (17), and the running cost can be suppressed.

  In the invention according to claim 2, at the time of reheating, the bath water is first circulated in the indirect heat exchanger (17) and exchanged with the hot water in the hot water storage tank (1) to raise the bath water. It is characterized by heating, and finally pouring hot water to raise the bath water to the target temperature. According to the second aspect of the present invention, in the heat exchange, the temperature rise at a slight temperature difference after the last time, which is time-consuming, is used as a high-temperature pouring hot water, so that the target hot water temperature can be reliably reached in a short time. The temperature can be raised.

  Further, the invention according to claim 3 is characterized in that the user can set the amount of hot water poured when re chasing. According to the third aspect of the present invention, since the temperature is raised to the target hot water temperature using the set amount of hot pouring water, the user can quickly reach the target temperature even after pouring hot water. It is possible to select whether to set the target temperature without pouring hot water without changing the current hot water volume, and the usability is improved.

  Further, in the invention described in claim 4, as hot water, the hot water in the hot water storage tank (1) is kept at the same temperature without mixing the water from the water supply pipe (7) with the temperature control valve (9). The hot water is poured into the bathtub (3). This is because hot water is poured into the bathtub (3) using hot water in the hot layer at the top of the hot water storage tank (1) that is not used for heating the bath water, or hot water immediately after boiling by H / P. Is to do. According to the fourth aspect of the present invention, the amount of hot water to be poured can be reduced, and a small amount of high-temperature water is poured in a short time, so that the temperature can be raised to the target hot water in a shorter time. Can do.

Further, in the invention according to claim 5, when performing reheating in a hot water storage tank (1) having a multi-can type and a plurality of hot water storage tanks (1A, 1B) connected in series, an indirect heat exchanger ( 17), and the amount of heat (Q ₁ ) stored in the first hot water storage tank (1A) on the upstream side of the hot water storage flow is the amount of heat (Q ₀ ) necessary for raising the bath water to the target temperature, When the amount of heat (Q ₂ ) stored in the second hot water storage tank (1B) on the downstream side of the hot water storage flow is less, the temperature is first increased by hot pouring hot water and then reheating is performed. Yes.

According to the invention described in claim 5, the temperature can be rapidly raised by preferentially performing hot pouring, and the temperature can be raised to the target hot water in a short time. Further, the amount of heat (Q that is stored in the first hot water storage tank (1A) by the high temperature water stored in the upper part of the second hot water storage tank (1B) by storing the hot water by pouring hot water (Q) ₁ ) increases, so that the state in which the amount of heat (Q ₁ ) in the first hot water storage tank (1A) is insufficient during the subsequent temperature increase can be reduced.

  In the invention described in claim 6, the inflow channel switching means (33) is provided in the middle of the communication passage (30) that connects the lower part of the first hot water storage tank (1A) and the upper part of the second hot water storage tank (1B). It is possible to switch between high temperature water flowing out from the second hot water storage tank (1B) and flowing into the lower part of the first hot water storage tank (1A) or directly under the indirect heat exchanger (17). It is characterized by.

According to the sixth aspect of the present invention, the hot water flowing from the second hot water storage tank (1B) to the first hot water storage tank (1A) when the high temperature pouring hot water is carried out is used as an indirect heat exchanger (17). , It is possible to reduce the heat loss caused by mixing the high temperature water with the medium temperature water below the first hot water storage tank (1A), and to immediately replenish the amount of heat required for the temperature increase. The temperature can be raised to the target hot water temperature over time. In addition, when the amount of heat (Q ₁ ) of the first hot water storage tank (1A) is insufficient not only in raising the temperature of the bath water but also when supplying hot water, the second hot water storage tank is located near the upper portion of the first hot water storage tank (1A). By injecting the high-temperature water (1B), the amount of medium-temperature water produced can be suppressed and the high-temperature water can be replenished efficiently. In addition, the code | symbol in the bracket | parenthesis of each said means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

(First embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing a configuration of a hot water storage hot water bath apparatus in the first embodiment of the present invention. 1 is a hot water storage tank for storing hot water, 2 is a heat pump unit as a heating means for heating the hot water, and 3 is a bathtub. Reference numeral 4 denotes a heating circulation circuit that connects the hot water storage tank 1 and the heat pump unit 2 so as to be circulated. The heating circulation circuit 5 has a heat circulation pump 5 and is connected to the heat pump forward pipe 4 a connected to the lower part of the hot water storage tank 1 and the upper part of the hot water storage tank 1. The heat pump return pipe 4b is configured to heat the cold water in the lower part of the hot water storage tank 1 by the heat pump unit 2 through the heat pump forward pipe 4a, and return the heated high temperature water to the upper part of the hot water storage tank 1 through the heat pump return pipe 4b. The hot water stored in the hot water storage tank 1 is stored.

  The hot water storage tank 1 has a plurality of hot water storage temperature sensors 6a to 6d vertically, and the hot water storage temperature sensors 6a to 6d detect a hot water storage amount by detecting a predetermined temperature or more. is there. 7 is a water supply pipe for supplying water to the hot water storage tank 1, 8 is a hot water discharge pipe for discharging hot water in the hot water storage tank 1, and 9 is a set temperature of cold water from the water supply pipe 7 and hot water from the hot water discharge pipe 8. A temperature control valve 10 for mixing and adjusting the temperature as described above, 10 is a hot water supply pipe for supplying hot water having a mixed set temperature, and 11 is a faucet provided at the end of the hot water supply pipe 10 in a bath or kitchen.

  12 is a hot water supply temperature sensor provided downstream of the temperature control valve 9, and 13 is a hot water supply flow rate sensor for counting the amount of hot water. Reference numeral 14 is a pressure reducing valve for reducing the water pressure to a predetermined pressure, and 15 is a pressure relief valve for releasing overpressure caused by heating. Reference numeral 16 denotes a bath circulation circuit, which connects the indirect heat exchanger 17 made of a serpentine pipe provided in the hot water storage tank 1 and the bathtub 3 so as to be circulated by a bath outlet pipe 16a and a bath return pipe 16b.

  18 is a bath circulation pump provided in the bath circulation circuit 16, 19 is a running water sensor that detects the presence or absence of running water, 20 is a bath temperature sensor that detects the temperature of bath water flowing through the bath circulation circuit 16, and 21 is the water pressure of bath water. It is a water level sensor which detects the water level in bathtub 3 from. Reference numeral 22 denotes a bypass pipe that bypasses the indirect heat exchanger 17 and connects the bath outlet pipe 16a and the bath return pipe 16b. A three-way valve 23 as a flow path switching means is connected to the bypass pipe 22 and the bath return pipe 16b. It is provided and selectively switches whether or not the hot water flowing through the bath circulation circuit 16 flows to the indirect heat exchanger 17.

  A hot water filling pipe 24 is branched from the middle of the hot water supply pipe 10 and connected to the bath circulation circuit 16 to fill the bathtub 3, and 25 is provided on the hot water filling pipe 24 and starts filling the bathtub 3. A hot water filling valve 26 for stopping, and a bath flow sensor 26 for counting the amount of hot water filling to the bathtub 3.

  Reference numeral 27 denotes a two-way valve provided between the hot water filling pipe 24 and the water level sensor 21. When the hot water is filled, the valve 27 is once opened to purge air from the hot water filling pipe 24 of the bath return pipe 16b to the bathtub 3. Then, the valve is closed so that the water level can be filled while the water level sensor 21 monitors the accurate water level. Reference numeral 28 denotes a heating control unit that controls the heating of the heat pump unit 2, and reference numeral 29 denotes a hot water bath control unit that controls hot water and bath.

  Next, the characteristic operation of this embodiment will be described with reference to FIG. FIG. 2 is a flowchart showing a general flow of the reheating control in the hot water bath control unit 29 in the first embodiment of the present invention (however, the operation of each device is not included). First, when a reheating bath is instructed by a remote controller (not shown) connected to the hot water bath control unit 29, whether or not hot water storage for heating the indirect heat exchanger 17 is in the hot water storage tank 1 in step S1. Determine whether. In this embodiment, the required hot water storage amount is 50 liters or more for hot water at 50 ° C. (hereinafter, liters are described as L).

  When the determination result is NO and the required hot water storage amount of 50 ° C. × 50 L is cut off, the process proceeds to step S 2, where the H / P is operated to raise the hot water supply water. Then, in step S3, it is determined whether or not boiling over the required amount of stored hot water has been completed. In this embodiment, the determined hot water storage amount is set to 100 L or more for hot water at 50 ° C., and boiling is continued while the determination result is NO. Then, when the determination result is YES and it is detected that the amount of stored hot water is 100L or more, the operation of H / P is stopped and the process proceeds to step S4. Further, if the determination result in step S1 is YES and there is hot water storage in the hot water storage tank 1 that is 50 ° C. × 50 L or more of the required hot water storage amount, the process proceeds to step S4.

  In step S4, the three-way valve 23 is switched to the indirect heat exchanger 17 side, the two-way valve 27 is opened, the bath circulation pump 18 is driven, and hot water in the bathtub 3 is provided in hot hot water in the hot water storage tank 1. The indirect heat exchanger 17 is circulated, and heating of the bath water is started using the hot water stored in the hot water storage tank 1. Further, in step S5, the bath temperature sensor is set to the time when the hot water temperature in the bath circulation circuit 16 becomes uniform and air is discharged after a certain time (2 minutes in the present embodiment) after the circulation for heating is started. At 20, the current temperature of the bath water and the target cooking temperature set by the remote controller are captured.

In step S6, the amount of hot water stored in the hot water storage tank 1 x hot water storage temperature with respect to the amount of heat Q ₀ required to raise the temperature of the current bathtub water detected by the water level sensor 21 to the target temperature. towards the heat storage amount to Q ₁ from determines whether it is large. The judgment result is the flow proceeds to step S7 when the heat storage amount Q ₁ in NO is small, whether it is possible heating up to the target temperature by a predetermined amount of pouring (the hot water of this embodiment is 60 ° C. 30L) judge.

  While the determination result is NO and while the predetermined amount of pouring cannot be raised to the target temperature, the bath water is circulated to the indirect heat exchanger 17 as the process of step S8, and the hot water in the hot water storage tank 1 is heated. Continue cooking and heating the bath water used. Then, when the bath water temperature rises and the remaining temperature difference can be raised to the target temperature with a predetermined amount of pouring, the process proceeds to step S9 when the determination in step S7 becomes YES, and the three-way valve 23 is switched to the bypass pipe 22 side and the hot water filling valve 25 is opened to start pouring hot water in the hot water storage tank 1.

  After the start of pouring hot water, it is determined in step S10 whether the bathtub water level has stopped at the upper limit of the bathtub, or whether there is a so-called overflow (overflow). If the determination result is NO and it is determined that the tank overflows (overflow from the bathtub), the process proceeds to step S11, and as the treatment, the hot water valve 25 is closed and poured, the hot water is stopped and the three-way valve 23 is indirectly heated. Switch to the exchanger 17 side and proceed to step S13. If the determination result in step S10 is YES and it is determined that there is no overflow (overflow), whether or not a predetermined amount (30 L in this embodiment) of pouring is completed in the bath flow sensor 26 in step S12. Determine.

While the determination result is NO, pouring is continued. If YES, the hot water filling valve 25 is closed to terminate pouring, the three-way valve 23 is switched to the indirect heat exchanger 17 side, and the process proceeds to step S13. Further, in YES determination at step S6 described above, even if the direction of the heat storage amount to Q ₁ in the hot water storage tank 1 for heat Q ₀ required for raising the temperature of the bathtub water is larger the process proceeds to step S13.

  In step S13, it is determined whether or not the bath water temperature has reached the target temperature. When the determination result is NO, the bath water is circulated to the indirect heat exchanger 17, and the hot water in the hot water storage tank 1 is heated. If the bath water temperature reaches the target temperature and the answer is YES, the bath circulation pump 18 is stopped to finish the additional cooking.

  FIG. 3 is a graph showing the relationship between the time of reheating and the bath temperature, and shows the result of simulation of the reheating time until the inventors reach the target temperature under the virtual conditions shown below the graph. First, as additional cooking A, conventional bathtub water is circulated to the indirect heat exchanger 17 and the hot water stored in the hot water storage tank 1 is used to heat the hot water of the hot water (no pouring without additional pouring). It shows that it takes 40 minutes to raise the temperature of the bathtub water at 40 ° C. to 40 ° C.

  Next, as additional cooking B, when additional cooking is performed under the same conditions, and finally 10 L of 60 ° C. hot water is poured into the target temperature for 35 minutes, additional cooking C is performed under the same conditions. It shows that the target temperature is reached in 23 minutes when additional cooking is carried out and 30 L of 60 ° C. hot water is finally poured and brought to the target temperature.

  In this way, after chasing to some extent, it is determined whether or not the temperature can be raised to the target hot water temperature by hot pouring hot water. If the temperature can be raised, the hot water is poured to raise the temperature. By the control of the present invention, even when the hot water for heating the indirect heat exchanger 17 in the hot water storage tank 1 is reduced, by pouring hot water from the upper high temperature layer, without waiting for the increase in H / P, It becomes possible to track the target temperature in a short time.

  Next, features in the present embodiment will be described. First, when reheating the bath water to the target temperature, as an auxiliary to the temperature increase, the indirect heat exchanger 17 side is closed by the three-way valve 23 so that the bypass pipe 22 and the bath circulation circuit 16 communicate with each other. At the same time, hot water in the hot water storage tank 1 is poured into the bathtub 3 from the hot water filling tube 24 through the bath circulation circuit 16.

This reheating to the limit in the heat storage amount to Q ₁ in the hot water storage tank 1, or, and fired additionally to the state reachable to the target hot water temperature in the high temperature dispensed water, hot then the hot water storage tank 1 as a heating aid By injecting water into the bathtub 3, the temperature is raised to the target temperature in a short time and reliably.

Further, even if this is obtained from heat exchange in the indirect heat exchanger 17 by the amount of heat Q ₀ required for temperature rise, the heat exchange increases the temperature with a slight temperature difference after the last time. By using high-temperature pouring hot water, the temperature can be raised to the target hot water temperature in a short time and reliably. In addition, it is not necessary to operate the H / P to supplement the amount of heat given to the indirect heat exchanger 17 and increase the hot water supply water, and the running cost can be suppressed.

  In addition, when bathing, the bath water is first circulated in the indirect heat exchanger 17 to exchange heat with the hot water in the hot water storage tank 1, and the bath water is heated, and finally the hot water is poured into the bathtub. The water is raised to the target temperature. Thereby, in the heat exchange, the temperature rise with a slight temperature difference after the last time, which is time-consuming, is used as the high-temperature pouring hot water, so that the temperature can be reliably raised to the target hot water temperature in a short time.

  In addition, the user can set the amount of hot water to be poured when performing the chasing. As a result, only the set amount of high-temperature pouring hot water is used to raise the temperature to the target hot water temperature, so the user does not want to pour hot water even if he wants to reach the target temperature quickly. It is possible to select whether or not the target temperature remains as the current hot water volume, and the usability is improved.

  Further, as hot water, the hot water in the hot water storage tank 1 can be poured into the bathtub 3 at the same temperature without mixing the water from the water supply pipe 7 with the temperature control valve 9. The hot water is poured into the bathtub 3 using hot water in the hot layer at the upper part of the hot water storage tank 1 which is not used for heating the bath water or hot water immediately after boiling by H / P. is there. As a result, the amount of hot water to be poured can be reduced, and a small amount of hot water can be poured in a short time, so that the temperature can be raised to the target hot water in a shorter time.

(Second Embodiment)
FIG. 4 is a schematic diagram showing a schematic configuration of a hot water storage hot water bath apparatus in the second embodiment of the present invention. The difference from the first embodiment described above is that the hot water storage tank 1 is a multi-can type and a plurality of hot water storage tanks 1A and 1B are connected in series. The hot water storage tank having the indirect heat exchanger 17 on the upstream side of the hot water storage flow is referred to as a first hot water storage tank 1A, and the hot water storage tank on the downstream side of the hot water storage flow is referred to as a second hot water storage tank 1B. The lower inflow / outflow portion Aa provided and the upper inflow / outflow portion Ba provided at the upper portion of the second hot water storage tank (auxiliary hot water storage tank) 1B are communicated with each other through the communication passage 30.

  As shown in FIG. 4, the heating circulation pump 5 normally supplies cold water to the heat pump unit 2 from a cold water inflow / outflow portion Ab provided at the lower part in the first hot water storage tank 1A, and the upper part of the first hot water storage tank 1A. A water flow is generated so as to recirculate from the hot water inflow portion Ac provided in the water. The communication passage 30 is provided with a first on-off valve 31 as an opening / closing means for interrupting the circulation, and the circulation with the heating circulation circuit 4 is interrupted below the cold water inflow / outflow portion Ab below the first hot water storage tank 1A. A second opening / closing valve 32 is provided as an opening / closing means for performing the above operation.

  These on-off valves 13 and 14 are controlled by a heating control unit 28 (not shown), and when the amount of hot water is reduced by hot water supply and the amount of high-temperature water reaches the first hot water storage tank 1A (the lower portion of the first hot water storage tank 1A is cold water). When the first on-off valve 31 is closed and the second on-off valve 32 is opened, the second hot water storage tank 1B is disconnected from the heating circulation circuit 4, and only the first hot water storage tank 1A is provided with cold water provided below. The cold water flows out from the inflow / outflow part Ab and enters a state of circulation.

Next, the characteristic operation of this embodiment will be described with reference to FIG. FIG. 5 is a flowchart showing a general flow of reheating control in the hot water bath control unit 29 in the second embodiment of the present invention (however, the operation of each device is not included). First, when fired add the bath is instructed by a remote controller (not shown) connected to the hot water bath controller 29, in step S21, the amount of heat Q ₁ that is heat accumulation in the first hot water tank 1A is, the target temperature bath water It is determined whether or not there is a heat quantity Q0 or more necessary for raising the temperature to the _{value of} . When the determination result is the heat storage amount Q ₁ is heat requirements Q ₀ or more YES is to implement a normal reheating mode flying to Step S29.

However, the determination result of step S21 is NO, the heat storage amount when Q ₁ is less than the required quantity of heat Q _0, the process proceeds to step S22, in turn heat storage amount of heat Q ₂ is ahead that heat accumulation in the second storage tank 1B Q _It is determined whether or not there is _one or more. If the determination result is NO and the second hot water storage tank 1B does not have a sufficient amount of heat storage, the routine proceeds to step S23, where the hot water supply is started to increase at H / P, and then the routine jumps to step S29. The follow-up mode is implemented. However, in YES determination result in the step S22, if the second storage tank 1B there is at least Q ₁ or more heat storage amount, the process proceeds to step S24, a predetermined amount of pouring (water in this embodiment 60 ° C. 30L), it is determined whether or not the temperature can be raised to the target temperature.

  If this determination result is NO and the temperature cannot be raised to the target temperature with a predetermined amount of pouring, the process proceeds to step S23, and after starting hot water supply with H / P, the process jumps to step S29 and is normal. The tracking mode is implemented. However, if the determination in step S24 is YES and the temperature can be raised to the target temperature, the process proceeds to step S25, the three-way valve 23 is switched to the bypass pipe 22 side, the hot water filling valve 25 is opened, and hot water in the hot water storage tank 1 is poured. It is what starts shiyu.

  After the start of pouring hot water, it is determined in step S26 whether the bathtub water level has not stopped at the upper limit of the bathtub, or whether there is a so-called overflow (overflow). When it is determined that the determination result is NO and overflowing (overflowing from the bathtub), the process proceeds to step S27, and as the treatment, the hot water valve 25 is closed, pouring is stopped, and the three-way valve 23 is indirectly heated. Switch to the exchanger 17 side and proceed to step S29.

  If the determination result in step S26 is YES and it is determined that there is no overflow (overflow), whether or not a predetermined amount (30 L in this embodiment) of pouring is completed in the bath flow sensor 26 in step S28. Determine. While the determination result is NO, pouring is continued. If YES, the hot water filling valve 25 is closed to end pouring, the three-way valve 23 is switched to the indirect heat exchanger 17 side, and the process proceeds to step S29.

  In step S29, a normal reheating mode is performed, and in step S30, it is determined whether or not the bath water temperature has reached the target temperature. While the judgment result is NO, the bath water is circulated to the indirect heat exchanger 17, and the reheating of the bath water using the hot water in the hot water storage tank 1 is continued and the bath water temperature reaches the target temperature. If YES, the bath circulation pump 18 is stopped and the chasing is finished.

Next, features in the present embodiment will be described. When reheating in a hot water storage tank having a plurality of hot water storage tanks 1A and 1B connected in series, an indirect heat exchanger 17 is provided to store heat in the first hot water storage tank 1A upstream of the hot water storage flow. If to that quantity of heat Q ₁ is less than the quantity of heat Q ₂ to which is heat accumulation in the second storage tank 1B of heat Q _0, and the hot water storage flow downstream required to raise the temperature of the bath water to the target temperature, First, the hot water is poured and the temperature is increased by hot water, and then the reheating is performed.

According to this, the temperature can be rapidly raised by preferentially performing hot pouring and hot water can be raised to the target hot water temperature in a short time. Further, since the quantity of heat Q ₁ of heat accumulation in the first hot water tank 1A is hot water which has accumulated in the second storage tank 1B top by said hot dispensed water moves to the first hot water storage tank 1A increases, since it is possible to reduce the state of insufficient amount of heat Q ₁ is in the first hot water tank 1A at Atsushi Nobori.

(Third embodiment)
FIG. 6 is a schematic diagram illustrating a schematic configuration of a hot water storage hot water bath apparatus according to a third embodiment of the present invention. The difference from the second embodiment described above is that a three-way valve 33 is provided as an inflow path switching means in the middle of the communication path 30 that communicates the lower part of the first hot water storage tank 1A and the upper part of the second hot water storage tank 1B. The high temperature water flowing out from the hot water storage tank 1B can be switched between flowing into the lower part of the first hot water storage tank 1A or flowing directly under the indirect heat exchanger 17 (Ae in FIG. 6). The three-way valve 33 is also energized and controlled by the hot water bath controller 29.

According to this, the hot water flowing into the first hot water storage tank 1A from the second hot water storage tank 1B when the high temperature pouring hot water described above is caused to flow directly under the indirect heat exchanger 17, whereby the high temperature water is The heat loss due to mixing with the medium temperature water at the bottom of 1 hot water storage tank 1A can be reduced and the amount of heat required for temperature increase can be replenished immediately, and the temperature can be raised to the target hot water temperature in a shorter time. . Further, even when the hot water not only raising the temperature of the bath water, injecting hot water of the second water tank 1B to the first storage tank 1A upper vicinity when heat to Q ₁ first hot water storage tank 1A is insufficient By doing so, the production amount of intermediate temperature water is also suppressed and high temperature water can be replenished efficiently.

(Other embodiments)
The present invention is not limited to the above-described embodiment, and for example, a known electric water heater having an electric heater for boiling hot water in the hot water storage tank 1 in the hot water storage tank 1 may be used. Moreover, the temperature control valve 9 may have a known configuration in which two temperature control valves 9 are provided exclusively for hot water supply and bath bathing. The flow path switching means 23 is not limited to a three-way valve, and for example, an open / close valve is provided at the inlet or outlet of the bypass pipe 22 and the indirect heat exchanger 17, respectively, and either one is selectively opened. Also good. The same applies to the three-way valve of the inflow path switching means. Moreover, you may carry out in the middle of memorialization.

It is a schematic diagram which shows schematic structure of the hot water storage type hot water bath apparatus in 1st Embodiment of this invention. It is a flowchart which shows the general | schematic flow of the chasing control in the hot water bath control part 29 in 1st Embodiment of this invention. It is a graph showing the relationship between the time at the time of chasing, and bathtub temperature. It is a schematic diagram which shows schematic structure of the hot water storage type hot-water bath apparatus in 2nd Embodiment of this invention. It is a flowchart which shows the general | schematic flow of the chasing control in the hot water bath control part 29 in 2nd Embodiment of this invention. It is a schematic diagram which shows schematic structure of the hot water storage type hot water bath apparatus in 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Hot water storage tank 1A ... 1st hot water storage tank 1B ... 2nd hot water storage tank 3 ... Bathtub 7 ... Water supply pipe 8 ... Hot water supply pipe 9 ... Temperature control valve 16 ... Bath circulation circuit 17 ... Indirect heat exchanger 18 ... Bath circulation pump 22 ... Bypass pipe 23 ... Three-way valve (flow path switching means)
24 ... Hot water filled pipe 30 ... Communication path 33 ... Three-way valve (inflow path switching means)
Q ₀ ... Amount of heat necessary to raise the bath water to the target temperature. Q ₁ ... Amount of heat stored in the first hot water storage tank 1A. Q ₂ ... Amount of heat stored in the second hot water storage tank 1B.

Claims (6)

A hot water storage tank (1) for storing hot water,
An indirect heat exchanger (17) disposed in the hot water storage tank (1);
A bath circulation circuit (16) for circulatingly connecting the indirect heat exchanger (17) and the bathtub (3);
A bath circulation pump (18) provided in the bath circulation circuit (16) for circulating bath water;
A temperature control valve (9) for mixing hot water from the hot water discharge pipe (8) connected to the hot water storage tank (1) and water from the water supply pipe (7);
A hot water pipe (24) connecting the downstream side of the temperature control valve (9) and the bath circulation circuit (16);
A bypass pipe (22) bypassing the indirect heat exchanger (17) to the bath circulation circuit (16);
The indirect heat exchanger (17) side is closed and the bypass pipe (22) communicates with the bath circulation circuit (16), or the bypass pipe (22) side is closed and the indirect heat exchanger ( 17) and a flow path switching means (23) for switching whether the bath circulation circuit (16) communicates,
In a hot water storage hot water bath apparatus for exchanging heat between hot water in the hot water storage tank (1) and bathtub water circulating in the indirect heat exchanger (17) for temperature rise or heat retention of bath water,
When reheating the bath water to the target temperature, as an auxiliary to the temperature rise, the flow path switching means (23) closes the indirect heat exchanger (17) side and the bypass pipe (22). And hot water in the hot water storage tank (1) are poured into the bathtub (3) from the hot water filling pipe (24) through the bath circulation circuit (16). A hot water storage hot water bath apparatus characterized by:   At the time of reheating, the bath water is first circulated in the indirect heat exchanger (17) and heat exchange with the hot water in the hot water storage tank (1) is performed, and finally the hot water is poured. 2. The storage-type hot water bath apparatus according to claim 1, wherein the temperature of the bath water is raised to a target temperature by performing   The storage-type hot water bath apparatus according to claim 1 or 2, wherein a user can set an amount of hot water to be poured when chasing.   As hot water, the hot water in the hot water storage tank (1) is poured into the bathtub (3) at the same temperature without mixing the water from the water supply pipe (7) with the temperature control valve (9). The hot water storage hot water bath apparatus according to any one of claims 1 to 3, wherein the hot water is heated. When the hot water storage tank (1) is a multi-can type and a plurality of hot water storage tanks (1A, 1B) are connected in series to perform reheating, the indirect heat exchanger (17) is provided and the hot water storage flow upstream The amount of heat (Q ₁ ) stored in the first hot water storage tank (1A) on the side is the amount of heat (Q ₀ ) required to raise the bath water to the target temperature, and the second hot water storage downstream of the hot water flow The hot water storage hot water supply according to claim 1, wherein when the amount of heat (Q ₂ ) stored in the tank (1B) is smaller, the temperature is increased by pouring hot water first and then reheating is performed. Bath equipment.   An inflow path switching means (33) is provided in the middle of the communication path (30) communicating the lower part of the first hot water storage tank (1A) and the upper part of the second hot water storage tank (1B), and the second hot water storage tank (1B The high-temperature water flowing out from the first hot water storage tank (1A) or the direct flow under the indirect heat exchanger (17) can be switched. 5. The hot water storage hot water bath apparatus according to 5.

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