JP2006284145A - Storage type hot water supply bath device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a storage type hot water supply bath device for comfortably filling and reheating hot water even when omitting a return pipe solenoid valve provided in a return pipe in a circuit which circulates bathtub water in a bath. <P>SOLUTION: The storage type hot water supply bath device comprises a heat exchange means 20 provided in a hot water storage tank 1 which stores hot water, a bypass pipe 31 for bypassing the heat exchange means 20, provided in the circuit 12 which connects the heat exchange means 20 to a bathtub via a circulation pump 19 for circulating bathtub water, and a flow path change-over means 35 having connection ports via which the bypass pipe 31 is connected to the heat exchange means 20 and the bathtub 14. The connection ports are individually closed and all connection ports are openable and closeable. The filling of hot water in the bathtub is smoothed by closing the circuit and detecting a water level in the bathtub as static pressure while reducing cost by omitting the return solenoid valve conventionally provided in the return pipe 16 in the circuit. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a hot water storage hot water bath apparatus that performs reheating or heat insulation of bathtub water in a bathtub by indirect heat exchange with hot water in the hot water storage can and hot water filling that directly supplies the hot water in the hot water storage can into the bathtub. It is.

  Conventionally, in this type of hot water storage hot water bath apparatus, as shown in FIG. 6, an indirect heat exchanger provided in the hot water storage can is connected to the bath circulation circuit, and the hot water in the hot water storage can is used as an electric heater or the like. 1 is a hot water storage tank of a hot water supply device, 2 is a boiling heater provided in the lower part of the hot water storage tank 1, and 3 is in the hot water storage tank 1. Is a rapid boiling heater that is used when the hot water in the hot water storage tank 1 runs out and is supplied. A first temperature sensor 4 is provided on the lower outer periphery of the hot water storage tank 1 to detect the boiling state of the water in the hot water storage tank 1, and a second temperature sensor 5 is provided on the upper outer periphery of the hot water storage tank 1 to detect the rapid boiling state. Temperature sensor.

  6 is an electric mixing valve for producing hot water of an appropriate temperature, 7 is one end connected to the upper part of the hot water storage tank 1 and the other end is connected to the hot water supply port of the electric mixing valve 6, and the hot water boiled in the hot water storage tank 1 A hot water supply pipe for supplying water from the hot water storage tank 1 to the electric mixing valve 6, 8 has one end connected to a water pipe and the other end connected to a water supply port of the electric mixing valve 6, and supplies tap water to the electric mixing valve 6 It is a water supply pipe to do. A branch water supply pipe 9 is branched from the water supply pipe 8 and connected to the lower part of the hot water storage tank 1 to supply water flowing through the water supply pipe 8 into the hot water storage tank 1.

  Reference numeral 10 denotes a mixed hot water pipe having one end connected to the mixed hot water outlet of the electric mixing valve 6, and the other end connected to the circulation path 12 at the branch portion 11. The circulation path 12 is connected to the bathtub 14 via the bathtub adapter 13, is constituted by both the forward pipe 15 and the return pipe 16, and supplies the mixed hot water supplied through the mixed hot water pipe 10 into the bathtub 14. In addition, the hot water in the bathtub 14 is circulated.

  17 is a solenoid valve with an air release valve provided in the mixed hot water pipe 10. By closing this valve 17, the bathtub water is prevented from flowing backward in the direction of the hot water storage tank 1 or the water supply pipe 8, and the bathtub water is fed into the circulation path 12. It can be circulated in. Reference numeral 18 denotes a return pipe electromagnetic valve provided in the return pipe 16 of the circulation path 12, and 19 denotes a circulation pump for circulating bath water provided in the return pipe 16 on the bathtub 14 side of the return pipe electromagnetic valve 18. Reference numeral 20 denotes heat exchange means provided in the circulation path 12. A part of the outgoing pipe 15 of the circulation path 12 is taken into the upper part of the hot water storage tank 1 and arranged so that the bathtub water flowing in the heat exchange means 20 is stored in the hot water storage tank. Heat exchange with hot water in 1 is possible. In this heat exchange means, a separate heat exchange pipe may be connected in series with the forward pipe 15 of the circulation path 12.

  21 is a water level sensor for performing hot water filling in the bathtub 14 so that the water level is arbitrarily set in advance. The water level sensor 21 is attached to the return pipe 16 on the bathtub 14 side of the circulation pump 19. Reference numeral 22 denotes a third temperature sensor for detecting the temperature of the bath water, and is attached on the forward pipe 15 before reaching the heat exchange means 20.

Reference numeral 23 denotes a power source for the boiling heater 2 and the rapid boiling heater 3 and a power source for driving the circulation pump 19. Reference numeral 24 denotes a switch for ON / OFF control of the power supply to the heating heaters 2 and 3, and 25 denotes a switch having a common contact c, a first contact a, and a second contact b. It can be switched to either the raising heater 2 or the rapid boiling heater 3. A switch 26 controls the supply of the power source 23 to the circulation pump 19.

  Reference numeral 27 denotes a control device with a built-in microcomputer, to which output signals from the first and second temperature sensors 4 and 5, the water level sensor 21 and the third temperature sensor 22 are input, and a switch 24, a switch 25, The electric mixing valve 6, the electromagnetic valve 17 with atmospheric release valve, the return pipe electromagnetic valve 18 and the switch 26 are controlled. Reference numeral 28 denotes a remote control for remote operation connected to the control device 27, and 29 denotes a switch for starting automatic operation provided on the remote control 28.

Next, hot water filling operation on the bathtub 14 side using hot water boiled in the hot water storage tank 1 will be described.
First, when the switch 29 of the remote controller 28 is pressed, the control device 27 takes in a signal from the remote controller 28 and opens the solenoid valve 17 with the atmospheric release valve and the return pipe solenoid valve 18. Moreover, the hot water supplied from the hot water supply pipe 7 and the water supplied from the water supply pipe 8 are mixed by the electric mixing valve 6 to obtain mixed hot water, and this mixed hot water is sent from here through the mixed hot water pipe 10 to the circulation path 12. Then, the water is fed into the bathtub 14 through the bathtub adapter 13 from both the forward pipe 15 and the return pipe 16 of the circulation path 12, and the hot water filling is started.

Then, the control device 27 detects whether or not the temperature of the hot water filling has reached a preset temperature by the third temperature sensor 22, and the electric mixing valve 6 prevents the temperature from deviating from the set temperature. The bath 14 is filled with hot water while controlling the mixing ratio of water and hot water. At this time, the water level in the bathtub 14 is measured by the water level sensor 21 at predetermined intervals. Note that the return pipe solenoid valve 18 is closed only when the water level is measured by the water level sensor 21 so that the water level in the bathtub 14 can be reliably measured.

  When the hot water in the bathtub 14 reaches a preset water level, the control device 27 closes the electromagnetic valve 17 with the air release valve. After that, the control device 27 closes the contact of the switch 26 at a predetermined interval to operate the circulation pump 19, and circulates the hot water in the bathtub 14 into the circulation path 12, so that the hot water temperature is changed from the predetermined temperature. The third temperature sensor 22 detects whether or not it has cooled.

Next, a bath water reheating operation will be described.
When the remote control 28 is operated and a follow-up operation is instructed, the return pipe solenoid valve 18 is opened, the contact of the switch 26 is closed until the bath water reaches the set temperature, and the circulation pump 19 is operated.
In this way, the bath water sucked into the return pipe 16 of the circulation path 12 from the bathtub adapter 13 by the circulation pump 19 enters the heat exchange means 20 communicating with the upper part in the hot water storage tank 1 along the outgoing pipe 15, Heat is exchanged with the hot water in the tank 1 and warmed. The hot water in the bathtub 14 is gradually warmed again by returning to the bathtub 14 from the bathtub adapter 13 through the forward pipe 15.
When the temperature detected by the third temperature sensor 22 reaches the set temperature, the control device 27 opens the contact of the switch 26 and stops the circulation pump 19. (For example, see Patent Document 1)

Japanese Patent Laid-Open No. 11-83156

  By the way, in this conventional thing, the hot water supplied from the hot water supply pipe 7 and the mixed hot water supplied from the water supply pipe 8 are circulated through the mixed hot water pipe 10 during the hot water filling operation on the bathtub 14 side. The mixed hot water fed into the bathtub 14 through the bathtub adapter 13 from both the forward pipe 15 and the return pipe 16 of the circulation path 12 is fed into the bathtub 14 through the forward pipe 15 in the upper part of the hot water storage tank 1. Since heat is exchanged with the hot water in the hot water storage tank 1 through the heat exchanging means 20 that is communicated and heated, the hot water supplied from the hot water supply pipe 7 and the hot water supply pipe 8 are sent from the forward pipe 15 into the bathtub 14. There was a fault that it was sent into the bathtub 14 at a temperature higher than the temperature at the time of mixing the supplied water.

  Therefore, as shown in FIG. 7, a bath three-way valve 30 is provided as a flow path switching means on the outlet side of the heat exchange means 20 of the forward pipe 15 of the circulation path 12, and the return pipe 16 of the circulation path 12 is connected to the inlet of the heat exchange means 20. A bypass passage 32 is formed by connecting a bypass pipe 31 to the bath three-way valve 30 from the front, and the hot water fed into the bathtub 14 through the forward pipe 15 by operating the bath three-way valve 30 is not passed through the heat exchanging means 20. The mixed hot water having the same temperature can be fed into the bathtub 14 from both the forward pipe 15 and the return pipe 16 by passing through the bypass path 32 and feeding it into the bathtub 14 from the forward pipe 15.

  When the bath water is replenished, the bath three-way valve 30 is operated to close the bypass passage 32, and the bath water passes through the heat exchanging means 20 and exchanges heat with hot water in the hot water storage tank 1 for heating. By doing so, the bath water is replenished.

  However, in this case, there is a disadvantage that a new part called the bath three-way valve 30 is required and the cost is increased, and that the control of the bath three-way valve 30 is also newly required and the control becomes complicated.

  Therefore, in order to solve the above problems, the present invention provides a hot water storage tank for storing hot water, heat exchange means disposed in the hot water storage tank, and the heat exchange means and the bathtub connected in a circulatory manner. In the hot water storage hot water bath apparatus provided with a circulation path that circulates the bathtub water, a bypass pipe that bypasses the heat exchange means is provided in the circulation path, the bypass pipe and the heat exchange means side, Provided with flow path switching means having connection ports for connecting each of the bathtub sides, the flow path switching means individually closes each connection port, and allows all connection ports to be opened simultaneously and all connection ports to be closed simultaneously. Is.

  Further, in the hot water storage hot water bath apparatus according to claim 2, particularly, the flow path switching means is constituted by a three-way valve, a return pipe is connected to the inflow side connection port, and two outflow side connection ports are connected. One is connected to the inlet side of the heat exchange means, the other is connected to one end of the bypass pipe, and the other end of the bypass pipe is connected to the outlet side of the heat exchange means.

  Further, in the hot water storage hot water bath apparatus according to claim 3, in particular, the configuration is such that a deformed T-shaped or deformed Y-shaped flow passage is formed in the valve body in the three-way valve of the flow path switching means. .

  According to the first aspect of the present invention, the bath water is circulated by the circulation pump to the circulation path connecting the heat exchange means arranged in the hot water storage tank for storing the hot water and the bathtub so as to be circulated. A bypass pipe that bypasses the heat exchange means is provided, and the connection ports connecting the bypass pipe, the heat exchange means side, and the bathtub side are individually closed, and all connection ports can be opened simultaneously and all connection ports can be closed simultaneously. Therefore, even if the return pipe solenoid valve provided in the return pipe of the conventional circulation path is omitted, the water level in the bathtub can be detected as a static pressure by closing the circulation path. It is possible to reduce the cost by omitting the return pipe solenoid valve while performing the tensioning smoothly.

  According to the hot water storage hot water bath apparatus of the second aspect of the present invention, the flow path switching means is constituted by a three-way valve, the return pipe is connected to the inflow side connection port, and the two outflow side connection ports are connected. One of them is connected to the inlet side of the heat exchange means, the other is connected to one end of the bypass pipe, and the other end of the bypass pipe is connected to the outlet side of the heat exchange means. Even if the provided return pipe solenoid valve is omitted, the circulation path can be closed and the water level in the bathtub can be detected as static pressure, so the return pipe solenoid valve can be omitted while smoothly filling the bathtub. When the hot water in the bathtub starts to be reheated, the three-way valve of the flow path switching means is in an all-mouth communication state, so that the hot water in the bathtub flowing from the return pipe is both in the heat exchange means and the bypass path. The hot water that has remained in the heat exchange means first flows into the bathtub. After a predetermined time from the start of reheating, set the three-way valve of the flow path switching means to the heat exchange means side connection port return pipe side connection port communication state, and the hot water in the bathtub flowing from the return pipe is removed. By passing through all the heat exchange means and circulating the bathtub water, the hot water in the bathtub can be replenished efficiently.

  According to the hot water storage hot water bath apparatus of the third aspect of the present invention, since the deformed T-shaped or deformed Y-shaped flow passage is formed in the valve body in the three-way valve of the flow path switching means, the bathtub The return pipe solenoid valve can be omitted while smoothing the hot water filling, and the cost can be reduced accordingly, and when the hot water in the bathtub starts to be reheated, the three-way valve of the flow path switching means is in an all-mouth communication state, The hot water in the bathtub that has flowed from the return pipe flows into both the heat exchange means and the bypass passage, preventing hot hot water that has stayed in the heat exchange means from first flowing into the bathtub, and reheating. After a predetermined time from the start of the operation, set the three-way valve of the flow path switching means to the heat exchange means side connection port return pipe side connection port communication state, and let all hot water in the bathtub flowing from the return pipe pass through the heat exchange means. By recirculating the bathtub water, it is possible to efficiently regenerate hot water in the bathtub. It is those that can be carried out.

Next, an embodiment of the present invention will be described with reference to the drawings.
In addition, description is abbreviate | omitted about the same structure as a prior art.
A flow meter 33 is attached to the return pipe 16 on the bathtub 14 side of the water level sensor 21, measures the circulation amount of the bathtub water, and outputs the result to the control device 27.
Reference numeral 34 denotes a fourth temperature sensor that detects the temperature of the bath water and sends an output signal to the control device 27, and is attached on the return pipe 16 between the circulation pump 19 and the heat exchange means 20.
In the present invention, as shown in FIG. 1, a multifunctional bath three-way valve 35 is provided as a flow path switching means between the circulation pump 19 and the inlet side of the heat exchanging means 20, and the heat exchanging means 20 for the forward pipe 15 is provided. By connecting the multi-function bath three-way valve 35 with the bypass pipe 31, the bypass path 32 is formed, and the return pipe solenoid valve 18 of the return pipe 16 is not required.

  As shown in FIG. 2, the multi-function bath three-way valve 35 is a three-way valve body, and includes a heat exchange means side connection port 37 connected to the inlet side of the heat exchange means 20 and a return pipe 16 connected to the return pipe 16. The pipe side connection port 38 and the forward pipe connection port 39 connected to the outlet side of the heat exchange means 20 of the forward pipe 15 through the bypass pipe 31 are provided.

  Reference numeral 40 denotes a spherical valve body provided in the three-way valve body 35, and a deformed T-shaped or Y-shaped flow passage 41 is formed in the valve body 40, and rotates around the rotation shaft 42. It moves.

  43 is a packing provided between the heat exchange means side connection port 37 side in the three-way valve main body 35 and the valve body 40, and between the return pipe side connection port 38 side in the three-way valve main body 35 and the valve body 40. In addition, the connection ports 37, 38, 39 are completely blocked, and are pressed against the valve body 40 with a predetermined pressure so as not to leak from the contact portion between the packing 43 and the valve body 40.

  In the conventional bath three-way valve 30, the flow passage in the valve body is formed in a T-shape. If the three-way connection ports are A port, B port, C port, A port C port communication, B port C The multi-function bath three-way valve 35 in this case can be operated only in three ways: mouth communication, all mouth closure or A mouth C mouth communication, B mouth C mouth communication, and all mouth communication. 4 operations can be performed, ie, all the ports closed in FIG. 3, the return pipe side connection port 38 in FIG. 4 communicates with the forward pipe connection port 39, and the heat exchange means side connection port 37 in FIG. Is.

Next, the operation of this hot water storage hot water bath apparatus will be described.
First, the boiling operation of the water in the hot water storage tank 1 filled with tap water will be described. The control device 27 connects the common contact c and the second contact b of the switch 25 and closes the switch 24. The power source 23 is fed to the rapid boiling heater 3 to boil water in the hot water storage tank 1 from above.

  When it is detected by the second temperature sensor 5 that the water in the upper part of the hot water storage tank 1 has been boiled up to a predetermined temperature, the control device 27 changes the contact of the switch 25 to the common contact c and the first contact a. The power source 23 is fed to the boiling heater 2 to boil the entire water in the hot water storage tank 1. The boiling of the entire hot water storage tank 1 is detected by the first temperature sensor 4 and when heated to a predetermined temperature, the control device 27 shuts off the contact of the switch 24 and stops the power supply of the power source 23.

Next, hot water filling of the bathtub 14 using hot water boiled in the hot water storage tank 1 will be described.
First, when the switch 29 of the remote controller 28 is pressed, the control device 27 takes in a signal from the remote controller 28 and opens the electromagnetic valve 17 with the air release valve.
Then, the circulation pump 19 is operated, and when the flow meter 33 is operated, it is determined that there is hot water in the bathtub 14, and when the flow meter 33 does not operate, it is determined that the bathtub 14 is empty.

  Then, the multi-function bath three-way valve 35 operates as shown in FIG. 4 to bring the return pipe side connection port 38 and the forward pipe connection port 39 into communication, and from the hot water supplied from the hot water supply pipe 7 and the water supply pipe 8. The supplied water is mixed by the electric mixing valve 6 to form mixed hot water, and this mixed hot water is sent from here through the mixed hot water pipe 10 to the circulation path 12 and bypassed from the forward pipe 15 of the circulation path 12 and the branching section 11. The hot water filling is started through the multi-function bath three-way valve 35 through the pipe 31 and from both the return pipes 16 through the bathtub adapter 13 into the bathtub 14.

  At this time, the mixed hot water fed from the return pipe 16 through the bathtub adapter 13 into the bathtub 14 flows through the return pipe 16 through the bypass path 32 without passing through the heat exchange means 20 from the branch portion 11. There is no temperature rise due to heat exchange with 20, and it is fed into the bathtub 14 at the same temperature as the mixed hot water fed from the forward pipe 15 through the bathtub adapter 13 into the bathtub 14.

Then, the control device 27 detects whether or not the temperature of the hot water filling has reached a preset temperature by the third temperature sensor 22, and the electric mixing valve 6 prevents the temperature from deviating from the set temperature. Hot water is filled in the bathtub 14 while controlling the mixing ratio of water and hot water.
At this time, the water level in the bathtub 14 is measured by the water level sensor 21 at a predetermined interval.
Only when the water level is measured by the water level sensor 21, the multi-function bath three-way valve 35 is operated as shown in FIG. 3 to close all the mouths so that the water level in the bathtub 14 can be reliably measured.

  When the hot water in the bathtub 14 reaches a preset water level, the control device 27 closes the electromagnetic valve 17 with the air release valve, and thereafter, the control device 27 closes the contact of the switch 26 at a predetermined interval and circulates. The pump 19 is operated, the hot water in the bathtub 14 is circulated in the circulation path 12, and the third temperature sensor 22 detects whether or not the hot water temperature has cooled from a predetermined temperature.

Next, the reheating of hot water in the bathtub 14 will be described.
First, when the switch 29 of the remote controller 28 is pressed, the multi-function bath three-way valve 35 operates as shown in FIG. Of hot water flows to both the heat exchange means 20 and the bypass passage 32, which joins and mixes at the connecting portion of the multifunctional bath three-way valve 35 and the forward pipe 15, and flows from the forward pipe 15 into the bathtub 14. .

  This is because the hot water staying in the heat exchanging means 20 at the start of reheating of the hot water in the bathtub 14 is at the same temperature as the hot water in the hot water storage tank 1 and flows from the return pipe 16. When all the hot water in the bathtub 14 is passed through the heat exchanging means 20 and flows into the bathtub 14 from the forward pipe 15, the hot water remaining in the heat exchanging means 20 remains hot in the bathtub 14. If the person bathes in the bathtub 14 and then flows in, the hot water in the bathtub 14 may directly hit the person, so the hot water in the bathtub 14 flowing from the return pipe 16 bypasses the heat exchange means 20. The hot water that has accumulated in the heat exchanging means 20 and the hot water in the low-temperature bathtub 14 are mixed by flowing through both the passages 32, and the hot water that flows into the bathtub 14 at the beginning of reheating is mixed. Things to avoid high temperature A.

  And after a predetermined time from the start of reheating of hot water in the bathtub 14, the hot water that has already stayed in the heat exchange means 20 does not flow into the bathtub 14 at a high temperature. 5 is operated as shown in FIG. 5 so that the heat exchange means side connection port 37 and the return pipe side connection port 38 communicate with each other, the circulation pump 19 is operated, and all the hot water in the bathtub 14 flowing from the return pipe 16 is exchanged. The means 20 is passed through and heated by heat exchange, flows into the bathtub 14 from the forward pipe 15 and circulates the bathtub water.

  When the temperature of the bathtub water detected by the fourth temperature sensor 34 reaches the set temperature, the multifunctional bath three-way valve 35 is operated as shown in FIG. 4 so that the return pipe side connection port 38 and the forward pipe connection port 39 are connected. In addition to the communication state, the circulation pump 19 is stopped.

  In this way, a part of the return pipe 16 of the circulation path 12 is taken into the upper part of the hot water storage tank 1 and arranged so that the bathtub water flowing in the heat exchange means 20 can exchange heat with the hot water in the hot water storage tank 1. In the hot water storage hot water bath apparatus that can replenish the bathtub water, a multi-function bath three-way valve 35 is provided between the circulation pump 19 and the inlet side of the heat exchange means 20, and the outlet side of the heat exchange means 20 of the forward pipe 15 is provided. And the multi-function bath three-way valve 35 are connected by a bypass pipe 31 to form a bypass path 32, and the spherical valve body 40 provided in the multi-function bath three-way valve 35 is transformed into a T-shape, or Even if the return pipe solenoid valve 18 provided in the return pipe 16 of the conventional circulation path 12 is omitted by forming the deformed Y-shaped flow path 41 and turning it around the rotation shaft 42, the circulation path 12 Can close and detect the water level in the tub 14 as static pressure Since, in which can be divided costs can be omitted return pipe solenoid valve 18.

Further, when the hot water in the bathtub 14 is reheated, the hot water in the bathtub 14 flowing from the return pipe 16 is heat-exchanged by setting the multi-function bath three-way valve 35 to the all-mouth communication state at the start of reheating. The hot water that has flowed through both the means 20 and the bypass path 32 and stayed in the heat exchanging means 20 and the hot water in the low-temperature bathtub 14 are mixed, and the hot water in the low-temperature bathtub 14 is first mixed in the bathtub 14 at the start of reheating. The hot water flowing in can be prevented from being hot, and after a predetermined time from the start of reheating, the multi-function bath three-way valve 35 is brought into a communication state with the heat exchange means side connection port 37 and the return pipe side connection port 38 from the return pipe 16. All the hot water in the bathtub 14 that has flowed through the heat exchange means 20 is heated by heat exchange, flows into the bathtub 14 from the forward pipe 15, and circulates the bathtub water, thereby efficiently in the bathtub 14. Reheating hot water It is those that can be.
In the present embodiment, the hot water storage hot water bath apparatus is described using an electric water heater with the heat exchange means 20 as an electric heater, but the present invention is not limited to this, and the heat pump unit uses a natural refrigerant such as carbon dioxide as the heat exchange means 20. Thus, a heat pump type hot water storage hot water bath apparatus that heats hot water in the hot water storage tank 1 may be used.

The schematic block diagram of one Embodiment of this invention. Sectional drawing which shows one operation state of the multifunctional bath three-way valve of this invention. Sectional drawing which shows the other operation state of the multifunctional bath three-way valve of this invention. Sectional drawing which shows the other operation state of the multifunctional bath three-way valve of this invention. Sectional drawing which shows the other operation state of the multifunctional bath three-way valve of this invention. Schematic of the conventional hot water storage type hot water bath apparatus. Schematic of the other conventional hot water storage hot water bath apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 12 Circulation path 14 Bathtub 19 Circulation pump 20 Heat exchange means 31 Bypass pipe 35 Multifunctional bath three-way valve

Claims (3)

A hot water storage comprising a hot water storage tank for storing hot water, a heat exchange means disposed in the hot water storage tank, a circulation path for circulating the heat exchange means and the bathtub, and a circulation pump for circulating the bathtub water In the hot water bath apparatus, a bypass pipe for bypassing the heat exchanging means is provided in the circulation path, and a flow path switching means having connection ports for connecting the bypass pipe, the heat exchanging means side, and the bathtub side is provided. The flow path switching means individually closes each connection port, and simultaneously opens all connection ports and simultaneously closes all connection ports. The flow path switching means is composed of a three-way valve, a return pipe is connected to the inflow side connection port, one of the two outflow side connection ports is connected to the inlet side of the heat exchange means, and the other is bypassed The hot water storage hot water bath apparatus according to claim 1, wherein one end of the pipe is connected and the other end of the bypass pipe is connected to the outlet side of the heat exchange means. 3. The hot water storage hot water bath apparatus according to claim 2, wherein a flow passage having a modified T-shape or a modified Y-shape is formed in the valve body in the three-way valve of the flow path switching means.

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