JP2020063875A - Water heater - Google Patents

Abstract

To provide a water heater enabling water discharge intended by a user while preventing waste hot water when a bathtub plug is intentionally opened.SOLUTION: A water heater includes: a bathtub plug state detection section for detecting an opening/closing state of a bathtub plug for opening/closing a drain port of a bathtub; and a control section for controlling setting and cancelling of an automatic water level adjustment function to automatically perform an adjustment operation for adjusting a water level of the bathtub to a set water level. When detecting an opening state of the bathtub plug while the automatic water level adjustment function is set, the control section performs function cancellation processing for forcedly cancelling the setting of the automatic water level adjustment function. The function cancellation processing is performed after elapsed time after detection of the opening state of the bathtub plug exceeds a prescribed time. When the closing state of the bathtub plug is detected before the elapsed time exceeds the prescribed time, the function cancellation processing is not performed and function continuation processing for continuing the setting of the automatic water level adjustment function is performed.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a hot water supply device.

  BACKGROUND ART Conventionally, for example, Patent Document 1 discloses a technique related to a bath device including a drive unit that opens and closes a bath drain plug manually and automatically. According to this technique, when it is detected that the drain plug is opened while the bath is filled with water or kept warm, the drain valve is automatically closed. As a result, it is possible to prevent a large amount of hot water from flowing out, thus preventing waste of energy.

  An automatic water level adjusting function is known as a function of the hot water supply device. When the automatic water level adjustment function is set, the water level is automatically adjusted even if the water level in the bathtub drops after filling with water.

JP, 2000-121152, A

  In the technique of Patent Document 1 described above, the drain valve is automatically closed when the user intentionally opens the drain plug by forgetting to release the function of filling the bath or keeping warm. Therefore, the technique of Patent Document 1 described above may not be able to realize drainage as intended by the user.

  Also, in a hot water supply device with an automatic water level adjustment function, if you forget to cancel the setting of the automatic water level adjustment function and open the bathtub stopper, there is a possibility that hot water will be wasted due to the supplementary hot water due to the automatic water level adjustment function. . As described above, the conventional technique has a problem in the operation when the drain plug is intentionally opened by forgetting to cancel the function of adjusting the state of the hot water in the bathtub.

  The present invention has been made to solve the above-described problems, and when the bathtub stopper is intentionally opened, it is possible to prevent wasteful use of hot water and realize drainage as intended by the user. An object of the present invention is to provide a hot water supply device capable of

  The hot water supply device according to the present invention, a bathtub plug state detection unit that detects the open / closed state of the bathtub plug that opens and closes the drainage port of the bathtub, and an automatic water level adjustment function that automatically performs the adjustment operation to adjust the water level of the bathtub to the set water level A control unit that controls setting and cancellation, and the control unit forcibly cancels the setting of the automatic water level adjustment function when the open state of the bathtub plug is detected during the setting of the automatic water level adjustment function. Is configured to do.

  According to the hot water supply device of the present invention, when the bathtub stopper is intentionally opened, it is possible to prevent wasteful use of hot water and realize drainage as intended by the user.

FIG. 1 is a configuration diagram of a hot water storage type hot water supply device as a hot water supply device in the first embodiment. FIG. 3 is a diagram for explaining the configuration of the remote controller according to the first embodiment. FIG. 3 is a circuit configuration diagram during a boiling operation of the hot water storage type water heater according to the first embodiment. FIG. 3 is a circuit configuration diagram of the hot water storage type hot water supply device according to the first embodiment at the time of operation of supplementary hot water. FIG. 3 is a circuit configuration diagram of the hot water storage type hot water supply device of the first embodiment during a heat retention operation. 3 is a flowchart of a control routine executed in the hot water storage type hot water supply device according to the first embodiment.

  Hereinafter, embodiments will be described with reference to the drawings. It should be noted that common elements in the respective drawings are denoted by the same reference numerals, and redundant description will be omitted.

Embodiment 1.
FIG. 1 is a configuration diagram of a hot water storage type hot water supply device as a hot water supply device according to the first embodiment. A hot water storage type water heater 100 shown in FIG. 1 includes a hot water storage tank unit 1 and a heat pump unit 60 configured to use a heat pump cycle. The two units 1 and 60 are connected by a heat pump inlet pipe 41 and a heat pump outlet pipe 42. Further, the hot water storage tank unit 1 has a control unit 70 built therein. The operation of various valves, pumps, and the like included in the hot water storage tank unit 1 and the heat pump unit 60 is controlled by a control unit 70 connected to these through wiring. Hereinafter, each component of the hot water storage type water heater 100 will be described.

  The heat pump unit 60 functions as a heating means for heating the low temperature water led from the hot water storage tank unit 1. The heat pump unit 60 forms a heat pump cycle by connecting a compressor 61, a boiling heat exchanger 62, an expansion valve 63, and an air heat exchanger 64 in an annular shape with a refrigerant circulation pipe 65. The boiling heat exchanger 62 is for exchanging heat between the refrigerant flowing through the refrigerant circulation pipe 65 that constitutes the heat pump cycle and the low temperature water guided from the hot water storage tank unit 1. Further, the HP outlet side thermistor 66 is a temperature sensor for detecting the temperature of the high temperature water heated by the boiling heat exchanger 62, and is provided in the heat pump outlet pipe 42. In order to obtain high-temperature water with the heat pump unit 60, it is preferable that the heat pump cycle uses carbon dioxide as a refrigerant and operates at a pressure exceeding the critical pressure.

  On the other hand, the hot water storage tank unit 1 incorporates the following various parts and pipes. The hot water storage tank 10 is for storing hot water. A water supply pipe 2 for supplying city water is connected to a lower portion of the hot water storage tank 10. A first tank upper pipe 43 and a second tank upper pipe 44 are connected to the upper portion of the hot water storage tank 10. A hot water supply pipe 3 for supplying the stored hot water to the outside of the water heater is connected in the middle of the second tank upper pipe 44. The hot water heated by the heat pump unit 60 flows into the hot water storage tank 10 from the upper part of the tank, and the low temperature water flows from the lower part of the tank through the water supply pipe 2, so that the upper and lower parts of the tank Hot and cold water is stored so that a temperature difference occurs at. Further, residual hot water thermistors 11 and 12 for detecting the temperature distribution of the hot water in the hot water storage tank 10 are attached to the upper and lower portions of the surface of the hot water storage tank 10, respectively. Based on the temperature distributions obtained by the residual hot water thermistors 11 and 12, the amount of residual hot water in the hot water storage tank 10 is grasped, and the start and stop of the boiling operation of the hot water in the hot water storage tank 10 by the heat pump unit 60 are controlled. To be done.

  A heat source pump 21 and a use side heat exchanger 22 are built in the hot water storage tank unit 1. The heat source pump 21 is a pump for circulating hot water in various pipes described later in the hot water storage tank unit 1. The use side heat exchanger 22 is a heat exchanger for heating the water to be heated on the secondary side by using the high temperature water supplied from the hot water storage tank 10 or the heat pump unit 60. In the present embodiment, a bath circulation circuit 51 that circulates the water in the bath 50 is provided as a configuration on the secondary side of the usage-side heat exchanger 22. The bath circulation circuit 51 is composed of a bath return pipe 56 and a bathing passage pipe 57. The bath return pipe 56 connects the bathtub adapter 80 of the bathtub 50 and the inlet side of the use side heat exchanger 22. Further, the furrow pipe 57 connects the outlet side of the use side heat exchanger 22 and the bathtub adapter 80. A bath circulation pump 52 for circulating bath water and a bath outlet side thermistor 53 for detecting the water temperature of the bath water discharged from the bath 50 are provided in the middle of the bath return pipe 56. Further, in the middle of the bath return pipe 56, a flow switch 58 as a water flow detection means for detecting the presence or absence of a water flow in the bath circulation circuit 51, and a water level sensor 59 as a water level detection means for detecting the water level of the bath 50 are provided. Each is installed.

  The hot water storage type hot water supply device 100 includes an open / close switch 81, a bathtub tap 82, and a bathtub tap drive unit 83. The bathtub plug 82 is a plug for opening and closing the drainage port of the bathtub 50. The bathtub stopper 82 is mechanically connected to the bathtub drive unit 83. The bathtub tap drive unit 83 includes an actuator for opening and closing the bathtub tap 82. The bathtub tap drive unit 83 is electrically connected to the automatic bathtub tap control unit 90. The bathtub tap drive unit 83 opens and closes the bathtub tap 82 according to an operation instruction from the automatic bathtub tap control unit 90. The open / close switch 81 is a switch that is interlocked with the operation of the bathtub stopper drive unit 83. By operating the opening / closing switch 81, the bathtub plug 82 can be manually opened / closed.

  The automatic bathtub controller 90 is electrically connected to the controller 70. The control unit 70 includes a bathtub plug state detection unit 91 and a bathtub plug operation instructing unit 92. The bathtub plug state detection unit 91 detects the open / closed state of the bathtub plug 82 via the automatic bathtub plug control unit 90. The bathtub tap operation instructing section 92 gives an operation instruction to the bathtub tap driving section 83 via the automatic bathtub tap control section 90.

  The hot water storage tank unit 1 also includes a bath hot water supply pipe 34 and a solenoid valve 35. The bath hot water supply pipe 34 connects the connection portion between the second tank upper pipe 44 and the hot water supply pipe 3 to the bath return pipe 56 of the bath circulation circuit 51. The solenoid valve 35 is arranged in the middle of the bath hot water supply pipe 34.

  In the middle of the bath hot water supply pipe 34, a water injection fine bubble generator 55 is installed. The water-injection fine bubble generator 55 is a device that functions as a cleaning unit that introduces fine bubbles during water injection into the bathtub 50 to wash the inside of the pipe. Further, a circulating fine air bubble generator 54 is installed in the bath return pipe 56 of the bath circulation circuit 51. The circulation fine bubble generator 54 is a device that functions as a cleaning unit that introduces fine bubbles during circulation of bath water to clean the inside of the pipe. The water injection fine bubble generator 55 and the circulation fine bubble generator 54 may have a known structure for generating fine bubbles.

  Next, the valves and pipes provided in the hot water storage tank unit 1 will be described. The hot water storage tank unit 1 has a first three-way valve 31, a second three-way valve 32, and a four-way valve 33. The first three-way valve 31 and the second three-way valve 32 are flow path switching means having two inlets a and b which are hot water inflows and a single port c which is one hot water outflow. The first three-way valve 31 and the second three-way valve 32 are configured to be able to switch the hot water path so that the hot water flows from either the a port or the b port. The four-way valve 33 is a flow path switching unit having two inlets b and c which are hot water inlets and two outlets a and d which are hot water outlets. The four-way valve 33 is configured to be able to switch the flow path form among three paths, that is, the c-a path, the cd path, and the b-a path.

  The hot water storage tank unit 1 includes a tank lower pipe 40, the heat pump inlet pipe 41, the heat pump outlet pipe 42, the first tank upper pipe 43, the second tank upper pipe 44, a tank return pipe 45, and a heat exchange on the use side. It has a vessel primary side inlet pipe 46, a utilization side heat exchanger primary side outlet pipe 47, a bypass pipe 48, and a tank upper part return pipe 49.

  More specifically, the lower tank pipe 40 is a flow path that connects the lower portion of the hot water storage tank 10 and the a port of the second three-way valve 32. The heat pump inlet pipe 41 is a flow path that connects the c port of the second three-way valve 32 and the inlet side of the heat pump unit 60. The heat pump outlet pipe 42 is a flow path that connects the outlet side of the heat pump unit 60 and the c port of the four-way valve 33. The tank upper return pipe 49 is a flow path connecting the d port of the four-way valve 33 and the b port of the first three-way valve 31. The first tank upper pipe 43 is a flow path that connects the upper portion of the hot water storage tank 10 and the a port of the first three-way valve 31. The second tank upper pipe 44 is a flow path that connects the upper portion of the hot water storage tank 10 and the middle of the tank upper return pipe 49. The tank return pipe 45 is a flow path that connects the port a of the four-way valve 33 and the return port provided between the central portion and the lower portion of the hot water storage tank 10. The usage-side heat exchanger primary-side inlet pipe 46 is a flow path that connects the c port of the first three-way valve 31 and the primary-side inlet of the usage-side heat exchanger 22. The usage-side heat exchanger primary-side outlet pipe 47 is a flow path that connects the primary-side outlet of the usage-side heat exchanger 22 and the b port of the second three-way valve 32. Further, the bypass pipe 48 is a flow path that connects the portion of the heat pump inlet pipe 41 on the outlet side of the heat source pump 21 and the b port of the four-way valve 33. The heat source pump 21 is installed between the connection portion of the heat pump inlet pipe 41 with the bypass pipe 48 and the second three-way valve 32.

  The hot water storage type water heater 100 according to the first embodiment includes a remote controller 71. The remote controller 71 is installed in, for example, a bathroom or a kitchen, and is connected to the control unit 70 via a communication line. FIG. 2 is a diagram for explaining the configuration of the remote controller according to the first embodiment. As shown in this figure, the remote controller 71 is provided with a display unit 72, an operation unit 73, and a voice output unit 74. The display unit 72 is for displaying various states of the hot water storage type water heater 100, and is constituted by, for example, a liquid crystal display. The operation unit 73 is for operating various controls of the hot water storage type water heater 100, and is composed of a plurality of buttons. The voice output unit 74 is for notifying various states of the hot water storage water heater 100 by voice, and is composed of a speaker. By operating the operation unit 73, the user can perform a boiling operation, a hot water operation, a heat retention operation, and the like, which will be described later.

  In the hot water storage type water heater 100 of the first embodiment, the hot water storage tank unit 1 is controlled by controlling the first three-way valve 31, the second three-way valve 32 and the four-way valve 33 according to the operating states shown in FIGS. 3 to 5 below. The hot and cold water passages inside are switched for use. FIG. 3 is a circuit configuration diagram during the boiling operation of the hot water storage type water heater according to the first embodiment. The control unit 70 has a function of executing the boiling operation. The boiling operation referred to here is an operation of boiling the water in the hot water storage tank 10 using the heat pump unit 60. During the boiling operation, the second three-way valve 32 is controlled so that the a port and the c port communicate with each other and the b port is closed. As a result, the tank lower pipe 40 and the heat pump inlet pipe 41 communicate with each other, and the use side heat exchanger primary side outlet pipe 47 side is closed to cut off the flow path from the use side heat exchanger 22. Further, during the boiling operation, the four-way valve 33 is controlled so that the c port and the d port communicate with each other and the a port and the b port are closed. As a result, the heat pump outlet pipe 42 and the tank upper return pipe 49 communicate with each other, and the tank return pipe 45 side is closed to cut off the flow path to the lower portion of the hot water storage tank 10. Further, during the boiling operation, the first three-way valve 31 is controlled so that the a port and the c port communicate with each other and the b port is closed. As a result, the first tank upper pipe 43 and the use side heat exchanger primary side inlet pipe 46 communicate with each other, and the tank upper return pipe 49 side is closed to cut off the flow path to the use side heat exchanger 22. .

  The boiling operation is executed by starting the operation of the heat source pump 21 and the heat pump unit 60 with the first three-way valve 31, the second three-way valve 32, and the four-way valve 33 controlled as described above. As a result, the low-temperature water flowing out from the lower portion of the hot water storage tank 10 is guided to the heat pump unit 60 via the tank lower pipe 40, the second three-way valve 32, the heat source pump 21, and the heat pump inlet pipe 41. Then, the low temperature water flowing into the heat pump unit 60 is heated in the boiling heat exchanger 62 to become high temperature water. The heated high-temperature water flows from the upper part of the hot water storage tank 10 into the hot water storage tank 10 through the heat pump outlet pipe 42, the four-way valve 33, the tank upper return pipe 49 and the second tank upper pipe 44, and is accumulated therein. It By performing such a boiling operation, high temperature water is stored from the upper layer inside the hot water storage tank 10, and the high temperature water layer gradually thickens. The high-temperature hot water stored in the hot-water storage tank 10 is used for filling the bathtub 50, for example.

  The hot water storage type water heater 100 of Embodiment 1 has an automatic water level adjusting function as its characteristic function. The automatic water level adjusting function here is a function of automatically performing an adjusting operation for adjusting the water level and the water temperature of the hot water in the bathtub 50 after the bath is filled with the hot water. The automatic water level adjustment function is automatically set after the completion of the filling of water, and is automatically released after the set time has elapsed. Further, the automatic water level adjusting function can be set and released at any timing by operating the operation unit 73 of the remote controller 71. When the automatic water level adjusting function is set, the control unit 70 monitors the water level and the water temperature in the bathtub 50, and executes the supplemental hot water operation and the warming operation.

  The hot water operation is an operation of automatically adding hot water to a set water level when the hot water in the bathtub 50 is low. FIG. 4 is a circuit configuration diagram of the hot water storage type hot water supply device according to the first embodiment at the time of addition hot water operation. This supplemental hot water operation is started by opening the solenoid valve 35 when the water level of the bathtub 50 detected by the water level sensor 59 falls below the set water level by a prescribed height (for example, 5 cm). During the addition hot water operation, the hot water in the hot water storage tank 10 is poured from the second tank upper pipe 44 and the bath hot water supply pipe 34 into the bathtub 50 via the bath circulation circuit 51. As a result, the hot water in the hot water storage tank 10 is supplied to the bath 50 through the bath hot water supply pipe 34 and the bath circulation circuit 51. Then, when the water level of the bathtub 50 detected by the water level sensor 59 reaches the set water level, the electromagnetic valve 35 is closed.

  The warming operation is an operation of automatically raising the temperature of the hot water in the bathtub 50 to a set temperature when the water temperature of the hot water in the bathtub 50 becomes low. FIG. 5: is a circuit block diagram at the time of heat retention operation of the hot water storage type water heater of Embodiment 1. The heat retention operation is started when the water temperature of the hot water in the bathtub 50 detected by the bathtub outlet side thermistor 53 falls below the set water temperature by a prescribed water temperature or more. In the heat retention operation, the first three-way valve 31 is controlled so that the a port and the c port communicate with each other and the b port is closed. The second three-way valve 32 is controlled so that the b port and the c port communicate with each other and the a port is closed. The four-way valve 33 is controlled so that the a port and the b port communicate with each other and the c port and the d port are closed. The heat retention operation is executed by starting the operation of the heat source pump 21 and the bath circulation pump 52 while the first three-way valve 31, the second three-way valve 32, and the four-way valve 33 are controlled as described above. As a result, in the use side heat exchanger 22, heat exchange is performed between the high temperature water flowing out from the upper part of the hot water storage tank 10 and the low temperature water flowing out from the bath 50. By performing such a warming operation, the water temperature of the hot water in the bathtub 50 gradually rises. When the water temperature of the hot water in the bathtub 50 detected by the bathtub outlet side thermistor 53 reaches the set water temperature, the operation of the heat source pump 21 and the bath circulation pump 52 is stopped.

  Next, the characteristic operation of the hot water storage type water heater 100 of Embodiment 1 will be described. Generally, the user sets the automatic water level adjustment function while taking a bath. However, in many cases, the set user and the last bather who drains the water from the bathtub are not the same person, so when the user drains the water from the bathtub after bathing, the set automatic water level adjustment It is conceivable that the bathtub stopper 82 may be opened by forgetting to cancel the function. In this case, the addition hot water operation is automatically started due to the decrease in the water level of the bathtub 50, and the hot water is wasted.

  Therefore, in the hot water storage water heater 100 of the present embodiment, the automatic water level adjusting function is canceled or continued in accordance with the following flow chart to drain water as intended by the user and prevent wasteful use of hot water. Is possible. Hereinafter, a specific process of control executed by the control unit 70 will be described with reference to the flowchart.

  FIG. 6 is a flowchart of a control routine executed in the hot water storage type water heater of the first embodiment. The control routine shown in FIG. 6 is executed when the automatic water level adjustment function is automatically set after the hot water storage water heater 100 has been filled with water, or when the user manually sets the automatic water level adjustment function. .

  In step S1 of the control routine shown in FIG. 6, the initial value of the bathtub plug state last time is stored as “closed”. In the next step S2, it is determined whether or not an instruction to cancel the automatic water level adjustment function has been issued. The instruction to release the automatic water level adjustment function here includes not only a manual release instruction from the operation unit 73 of the remote controller 71 but also an automatic release instruction with the lapse of time. In the process of step S2, if the determination is accepted, the process proceeds to step S3, and if the determination is not accepted, the process proceeds to step S4.

  In step S3, the automatic water level adjustment function is forcibly released as intended by the user. In the following description, the process performed in step S3 is referred to as "function release process". When the process of step S3 is completed, this routine ends.

  In step S4, it is determined whether the bathtub tap state detected by the bathtub tap state detection unit 91 is the "open" state. As a result, when the determination is established, it is determined that the bathtub plug 82 is open during the continuation of the automatic water level adjusting function, and the process proceeds to the next step S5.

  In step S5, since the current bathtub tap state is "open", the bathtub tap state is updated to "open" last time. In the next step S6, when the hot water operation or the heat retention operation as the adjusting operation is in operation, these operations are temporarily stopped. In the following description, the process performed in step S6 is referred to as "temporary stop process". In the next step S7, it is determined whether or not the elapsed time since the bathtub plug state is set to "open" has exceeded a preset specified time. The stipulated time here is stipulated as 5 seconds, for example, as a time at which it can be reliably determined that the bathtub plug 82 has been intentionally opened.

  If the result of the process in step S7 is that the determination is not successful, it is determined that the automatic water level adjustment function may be canceled or the bathtub plug state may be "closed" before the elapsed time exceeds the specified time. It In this case, the process returns to step S2, and it is determined again whether or not an instruction to cancel the automatic water level adjustment function has been issued. On the other hand, if the result of the process of step S7 is that the determination is successful, it can be determined that the user has begun draining while forgetting to cancel the automatic water level adjustment function. In this case, the process proceeds to step S3, and the function cancellation process is performed.

  On the other hand, if the result of the process in step S4 is that the determination is not established, it is determined that the bathtub plug 82 is closed during the continuation of the automatic water level adjusting function, and the process proceeds to step S8. In step S8, it is determined whether or not the bathtub plug state was "open" last time. As a result, when it is confirmed that the determination is successful, it can be determined that the opening of the bathtub stopper 82 was a temporary opening due to noise or mischief of a child. In this case, the process proceeds to the next step S9. On the other hand, in the process of step S8, if the determination is not established, it can be determined that there is no problem even if the automatic water level adjusting function is continued because the bathtub plug 82 is closed. In this case, the process proceeds to step S13 described below.

  In step S9, since the current bathtub tap state is "closed", the bathtub tap state is updated to "closed" last time. In the next step S10, the water level sensor 59 detects the water level in the bathtub 50. In the next step S11, it is determined whether or not the detected water level is lower than a specified height (for example, 5 cm). As a result, if the determination is approved, the process proceeds to step S12, and if the determination is not approved, step S12 is skipped and the process proceeds to step S13.

  In step S12, the hot water operation is executed. In the following description, the process performed in step S12 is referred to as "additional bath process". As a result, the water level in the bathtub 50 rises to the set water level. In the next step S13, the setting of the automatic water level adjustment function is continued. In the following description, the process performed in step S13 is referred to as "function continuation process". When the function continuation process is performed in step S13, the process proceeds to step S2.

  As described above, according to the hot water storage type water heater 100 of the first embodiment, when the bathtub plug 82 is opened while the automatic water level adjusting function is set, the automatic water level adjusting function is automatically released. As a result, when the bathtub plug 82 is intentionally opened, it is possible to realize drainage as intended by the user while preventing the waste water from being used due to the addition hot water operation.

  Further, according to the hot water storage type water heater 100 of the first embodiment, when the opening of the bathtub plug 82 is detected during the setting of the automatic water level adjustment function, the supplemental hot water operation and the warming operation during operation are temporarily performed. Be stopped. This makes it possible to quickly suppress wasteful use of hot water and energy in the drainage.

  Further, according to the hot water storage type water heater 100 of the first embodiment, the automatic water level adjusting function is not released until the elapsed time from the opening of the bathtub plug 82 during the setting of the automatic water level adjusting function exceeds the specified time. This can prevent the automatic water level adjustment function from being released in the case of a temporary incorrect opening due to mischief or the like.

  Further, according to the hot water storage type water heater 100 of Embodiment 1, when the bathtub plug 82 is closed before the elapsed time exceeds the specified time, the automatic water level function is continued. As a result, it is possible to prevent the automatic water level function from being canceled when the bathtub plug 82 is closed by noticing the drainage caused by the unintentional opening. Further, after closing the bathtub plug 82, the addition hot water treatment is performed according to the water level of the bathtub 50, so that the water level lowered by unintended drainage can be returned to the set water level.

  By the way, the hot water storage type water heater 100 of Embodiment 1 described above may be configured to include the following modified modes.

  In the hot water storage water heater 100 of the first embodiment described above, the user can be informed of the state of the hot water storage water heater 100 by the text guidance on the display unit 72 of the remote controller 71 or the voice guidance from the voice output unit 74 of the remote controller 71. It may have a notifying function for notifying.

  For example, when the open state of the bathtub plug 82 is detected by the processing of step S4, the notification function provides, as information related to the function cancellation processing, “cancel the automatic water level adjustment function with opening”. May be configured to be notified to the user. This makes it possible to effectively prompt the user to close the bathtub plug 82 when the bathtub plug 82 is in the open state against the user's intention.

  In addition, when the process of step S6 is executed, the notification function indicates, as information related to the temporary stop process, "these operations have been stopped because the opening of the bathtub plug 82 was detected". It may be configured to notify the user of the guidance. This makes it possible to effectively inform the user of the reason why the automatic water level adjustment function has stopped.

  In addition, the notification function, as the information related to the function continuation process when the process of step S8 is executed, is a guidance of "continue the automatic water level adjusting function by detecting the closure of the bathtub plug 82". May be configured to be notified to the user. This makes it possible to effectively inform the user that the automatic water level adjustment function will be continued.

  The control unit 70 may be configured to include a function as a first setting unit that allows the user to arbitrarily set the specified time from the operation unit 73 of the remote controller 71.

  The control unit 70 may be configured to include a function as a second setting unit that allows the user to arbitrarily set the permission and prohibition of the function cancellation process from the operation unit 73 of the remote controller 71.

  Further, the user may arbitrarily set the specified time from when the bathtub plug 82 is opened to when the automatic water level adjusting function is canceled, using the operation unit 73 of the remote controller.

  Further, the automatic water level adjustment function is not limited to the supplemental water operation and the heat retention operation. That is, the automatic water level adjusting function is a water pouring function of pouring water into the bathtub 50 to lower the water temperature, a high-temperature hot water adding function of adding high-temperature hot water to the bathtub 50, and circulating the remaining hot water of the bathtub 50 to the bath return pipe 56 and the bath. Various functions relating to the circulation of bath water or the hot water supply to the bath 50 may be included, such as a circulation cleaning function for cleaning the outgoing pipe 57 and a bath heat recovery function for recovering heat by circulating the remaining hot water.

  Further, in hot water storage water heater 100 of the first embodiment described above, when the bathtub plug 82 is opened while the automatic water level adjustment function is set, the function cancellation process may be performed without waiting for the elapse of a specified time. . In this case, in the control routine shown in FIG. 6, the control unit 70 may move to step S3 and perform the function release processing when the determination of the processing of step S4 is established.

1 hot water storage tank unit, 2 hot water supply pipe, 3 hot water supply pipe, 10 hot water storage tank, 11 residual hot water thermistor, 21 heat source pump, 22 use side heat exchanger, 31 first three-way valve, 32 second three-way valve, 33 four-way valve, 34 Bath hot water supply pipe, 35 solenoid valve, 40 tank lower pipe, 41 heat pump inlet pipe, 42 heat pump outlet pipe, 43 first tank upper pipe, 44 second tank upper pipe, 45 tank return pipe, 46 use side heat exchanger primary Side inlet piping, 47 Utilizing side heat exchanger primary side outlet piping, 48 Bypass piping, 49 Tank top return piping, 50 Bathtub, 51 Bath circulation circuit, 52 Bath circulation pump, 53 Bath outlet thermistor, 54 Micro bubbles for circulation Generator, 55 Fine bubble generator for water injection, 56 Bath return pipe, 57 bathing pipe, 58 flow switch, 59 water level sensor, 60 heat pump unit, 61 compressor, 62 boiling heat exchanger, 63 expansion valve, 64 air heat exchanger, 65 refrigerant circulation pipe, 66 outlet side thermistor, 70 Control unit, 71 remote control, 72 display unit, 73 operation unit, 74 voice output unit, 81 open / close switch, 82 bathtub stopper, 83 bathtub drive unit, 90 automatic bathtub control unit, 91 bathtub state detection unit, 92 bathtub stopper Operation instruction unit, 100 hot water storage type water heater

Claims (10)

A bathtub plug state detection unit that detects the open / closed state of the bathtub plug that opens and closes the drainage port of the bathtub;
A control unit for controlling setting and cancellation of an automatic water level adjusting function for automatically performing an adjusting operation of adjusting the water level of the bathtub to a set water level,
The control unit is configured to perform a function cancellation process for forcibly canceling the setting of the automatic water level adjusting function when detecting the open state of the bathtub stopper during the setting of the automatic water level adjusting function. A characteristic hot water supply device. The control unit is
When performing the function release processing, the function release processing is configured to be performed after the elapsed time from the detection of the open state of the bathtub stopper exceeds a predetermined specified time. The hot water supply device according to claim 1.   The hot water supply device according to claim 2, wherein the control unit is configured to notify information related to the function cancellation process when the open state of the bathtub stopper is detected.   When the closed state of the bathtub stopper is detected before the elapsed time exceeds the specified time, the control unit performs a function continuation process for continuing the setting of the automatic water level adjustment function without performing the function cancellation process. The hot water supply device according to claim 2 or 3, wherein the hot water supply device is configured as described above.   The water heater according to claim 4, wherein the control unit is configured to notify information related to execution of the function continuing process when the function continuing process is executed.   When the control unit detects the closed state of the bathtub stopper before the elapsed time exceeds the specified time, the control unit detects the water level of the bathtub before the function continuation process, and the bathtub according to the water level. The hot water supply device according to claim 4 or 5, wherein the hot water supply device is configured to add hot water to the hot water.   The control unit is configured to perform a pause process for temporarily stopping the adjusting operation when the adjusting operation by the automatic water level adjusting function is performed when the open state of the bathtub stopper is detected. The hot water supply apparatus according to any one of claims 2 to 6, wherein:   The water heater according to claim 7, wherein the control unit is configured to notify information related to the temporary stop process when the temporary stop process is executed.   The water heater according to any one of claims 2 to 8, wherein the control unit further includes a first setting unit for arbitrarily setting the specified time.   The water heater according to any one of claims 1 to 9, wherein the control unit further includes a second setting unit for arbitrarily setting permission and prohibition of the function cancellation process.

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