JP6951990B2 - Bath water heater - Google Patents

Description

The present invention relates to a bath water heater, and more particularly to a bath water heater that grasps and notifies the situation of a person in the bathroom.

Conventionally, in order to prevent bathing accidents in the bathroom, there is known a technique of detecting a person's bathing and bathing in a bathtub by various sensors installed in a bath water heater (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2003-83606

Some bath water heaters have the function of automatically or manually pouring hot water into the bathtub. When pouring hot water, hot water is poured into the bathtub through a pipe connected to the bathtub.

Here, when a motion sensor that detects the movement of a person in the bathroom by detecting the amount of temperature change is used for the above detection, this motion sensor may be affected by the temperature of the hot water poured into the bathtub. There is. In this case, the motion sensor may erroneously detect the movement of the hot water accompanying the pouring as the movement of a person, which may reduce the usability of the user.

The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a bath water heater capable of suitably grasping the situation of a person in a bathroom.

In order to solve the above-mentioned problems, the bath hot water supply device according to the present invention includes a motion sensor that detects the presence or absence of a person based on the amount of temperature change in the bathroom, and hot water that pours hot water into the bathtub in the bathroom. It includes a pouring control unit for performing a beam and a sensitivity control unit for lowering the detection sensitivity of the motion sensor or disabling the detection for a predetermined period after the start of the hot water beam.

In the bath water heater according to the present invention, the situation of a person in the bathroom can be suitably grasped.

Schematic system configuration diagram of the hot water storage type bath water heater in this embodiment. Functional block diagram of the hot water storage type bath water heater. The figure for demonstrating the detailed structure of a pyroelectric sensor. The flowchart explaining the amplification factor switching process executed by the hot water supply apparatus in this embodiment.

An embodiment of the hot water supply device according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic system configuration diagram of the hot water storage type bath water heater 1 in the present embodiment.

FIG. 2 is a functional block diagram of the hot water storage type bath water heater 1.

The hot water storage type bath hot water supply device (hot water supply device) 1 mainly includes a hot water storage tank unit 3, a heat pump unit 4, a bath remote controller 5, and a kitchen remote controller 10. Further, the hot water supply device 1 is connected to the bathtub 7, the shower 8, and the faucet 9 in the bathroom 6.

The hot water storage tank unit 3 has a hot water storage tank 11 for storing hot water. The hot water storage tank 11 has a plurality of hot water storage temperature sensors 12 for detecting the hot water storage temperature in the hot water storage tank 11 in the vertical direction of the side surface. A water supply pipe 13 for supplying city water to the hot water storage tank 11 is connected to the bottom of the hot water storage tank 11. The water supply pipe 13 has a pressure reducing valve 14 that reduces the water supply pressure of city water to a constant pressure. Further, an overpressure relief valve 16 for releasing the overpressure in the hot water storage tank 11 is connected to the top of the hot water storage tank 11.

A hot water discharge pipe 18 for discharging hot water from the hot water storage tank 11 is connected to the top of the hot water storage tank 11. The hot water outlet pipe 18 is connected to the water supply bypass pipe 20 branched from the water supply pipe 13 via the hot water supply mixing valve 19. The water supply bypass pipe 20 has a water supply temperature sensor 25 that detects the water supply temperature.

The hot water supply mixing valve 19 mixes the hot water from the water supply bypass pipe 20 and the hot water from the hot water outlet pipe 18 so as to reach the hot water supply set temperature. The hot water supply mixing valve 19 is connected to the hot water supply pipe 24, and the hot water mixed by the hot water supply mixing valve 19 is guided to the shower 8 and the curan 9 by the hot water supply pipe 24. The hot water supply pipe 24 includes a hot water supply flow rate sensor 26, a hot water supply temperature sensor 27, and a flow rate adjusting valve 28. The hot water supply flow rate sensor 26 and the hot water supply temperature sensor 27 detect the flow rate and temperature of hot water flowing through the hot water supply pipe 24, respectively. The flow rate adjusting valve 28 adjusts (limits) the flow rate of hot water flowing through the hot water supply pipe 24 by adjusting the opening degree.

The hot water supply pipe 24 is connected to a hot water beam pipe 32 that supplies hot water to the bath circulation circuit 40. The hot water beam pipe 32 has a hot water beam flow rate sensor 33, a hot water beam temperature sensor 34, and a hot water beam on-off valve 35. The hot water flow rate sensor 33 and the hot water temperature sensor 34 detect the flow rate and temperature of hot water supplied from the hot water pipe 32, respectively. The hot water beam on-off valve 35 is a solenoid valve that opens and closes the hot water beam pipe 32 to control the flow of hot water.

The hot water storage tank unit 3 has a bath circulation circuit 40 that circulates the hot water (bath water) of the bathtub 7 between the circulation port 7a provided in the bathtub 7 and the bath heat exchanger 41. The bath circulation circuit 40 mainly includes a return pipe 42, a bath heat exchanger 41, and an outgoing pipe 43. The return pipe 42 and the forward pipe 43 are connected to the circulation port 7a of the bathtub 7 to circulate hot water from the bathtub 7. The return pipe 42 returns the bath water to the bath heat exchanger 41. The bath heat exchanger 41 is provided in the upper part of the hot water storage tank 11, and heats the bath water with the heat of the hot water in the hot water storage tank 11. The going pipe 43 supplies the hot water heated by the bath heat exchanger 41 to the bathtub 7 side.

The bath circulation circuit 40 has a heat exchange bypass pipe 46 that bypasses the return pipe 42 and the outgoing pipe 43 via the bath three-way valve 45. The bath three-way valve 45 switches between circulating hot water from the return pipe 42 to the bath heat exchanger 41 and bypassing it to the outgoing pipe 43.

Further, the return pipe 42 has a water level sensor 48, a bath temperature sensor 49, and a bath circulation pump 50. The water level sensor 48 detects the water level in the bathtub 7 by detecting the pressure from the bathtub 7. The bath temperature sensor 49 detects the temperature of the circulating hot water. The bath circulation pump 50 circulates hot water in the bath circulation circuit 40. The outgoing pipe 43 has a flowing water switch 51 that detects the presence or absence of circulation (distribution) of hot water in the bath circulation circuit 40.

The hot water storage tank unit 3 has a hot water storage control unit 55 that electrically controls each part of the hot water storage tank unit 3. The hot water storage control unit 55 has a logic circuit such as an MPU, and controls each part of the hot water storage tank unit 3 according to a program stored in advance while referring to the memory. That is, the hot water storage control unit 55 includes a hot water storage temperature sensor 12, a water supply temperature sensor 25, a hot water supply flow rate sensor 26, a hot water supply temperature sensor 27, a hot water flow rate sensor 33, a hot water supply temperature sensor 34, a water level sensor 48, a bath temperature sensor 49, and The detected value of the flowing water switch 51 is acquired, and the operation of various valves of the hot water storage tank unit 3 is controlled based on the detected value. In the present embodiment, the hot water storage control unit 55 functions as a hot water pouring control unit for pouring hot water into the bathtub 7 in the bathroom 6 (so that the water level reaches a preset set water level). In addition, the hot water storage control unit 55 functions as a sensitivity control unit that lowers the detection sensitivity of the motion sensor or invalidates the detection for a predetermined period after the start of hot water filling.

Further, the hot water storage control unit 55 receives a user's instruction via the bath remote controller 5 and the kitchen remote controller 10, controls each unit, and executes the instruction. That is, the hot water storage control unit 55 executes the hot water supply operation, the automatic bath operation, the bath repelling operation, and the like based on the hot water supply set temperature, the bath set temperature, the set hot water amount, and the like instructed by the bath remote controller 5 and the kitchen remote controller 10. The hot water storage control unit 55 has a timer that counts (counts up) the elapsed time.

The hot water storage tank unit 3 is connected to the heat pump unit 4 via a heating forward pipe 65 and a heating return pipe 66. The heat pump unit 4 boils the hot water in the hot water storage tank 11 mainly at midnight. The heat pump unit 4 includes a heating going pipe 65, a heating return pipe 66, a refrigerant circuit 61, a heating control unit 62, and an outside air temperature sensor 63.

The heating going pipe 65 has a heating circulation pump 64 and a water entry temperature sensor 69. The heating circulation pump 64 circulates hot water taken out from the bottom of the hot water storage tank 11 in the refrigerant circuit 61. The water entry temperature sensor 69 detects the temperature of the hot water flowing into the refrigerant water heat exchanger 68 from the heating going pipe 65. The heating return pipe 66 returns the hot water heated by the heat pump unit 4 to the upper part of the hot water storage tank 11. The heating return pipe 66 has a boiling temperature sensor 70 that detects the temperature of the hot water flowing out of the refrigerant water heat exchanger 68.

The refrigerant circuit 61 is a circuit in which a compressor 71, a refrigerant water heat exchanger 68, an expansion valve 72, and an evaporator 73 are cyclically connected by a refrigerant cycle pipe 74. The compressor 71 compresses the refrigerant into a high-temperature refrigerant. The refrigerant water heat exchanger 68 exchanges heat between the high temperature refrigerant and the hot water from the hot water storage tank 11. The expansion valve 72 decompresses the refrigerant radiated by the refrigerant water heat exchanger 68 to obtain a low-temperature low-pressure refrigerant. The evaporator 73 evaporates the low temperature and low pressure refrigerant. Further, outside air, which is a heat source, is blown to the evaporator 73 by the blower 75.

The outside air temperature sensor 63 detects the outdoor outside air temperature in which the heat pump unit 4 is installed. The heating control unit 62 has a logic circuit such as an MPU, and electrically controls each part of the heat pump unit 4 according to a program stored in advance while referring to a memory. That is, the heating control unit 62 acquires the detected values of the water entry temperature sensor 69, the boiling temperature sensor 70, and the outside air temperature sensor 63, and controls the operation of the refrigerant circuit 61 and the like.

The bathroom 6 is provided with a bathtub 7, a shower 8, a faucet 9, and a bath remote controller 5. The bath remote controller 5 includes a display unit 91, a speaker 92 (FIG. 2), switches 93, a communication unit 94 (FIG. 2), a pyroelectric sensor 98, and a bath remote controller control unit 97. ..

The display unit 91 displays various information regarding the hot water supply device 1 (hot water supply set temperature, bath set temperature, bath set hot water amount, residual hot water amount, operating state of the hot water supply device 1 and the like).

The switches 93 include a setting switch, an automatic bath operation switch, a repelling switch, a hot water switch, a menu switch, and the like.

The setting switch accepts instructions for setting the hot water supply set temperature, the bath set temperature, and the bath set hot water amount. The automatic bath operation switch receives an instruction to start or stop automatic bath operation. The eviction switch receives an instruction to start or stop the eviction operation. The tasting hot water switch receives an instruction to start or stop the tasting hot water operation. The menu switch calls a hierarchical menu setting screen for making detailed settings for the hot water supply device 1.

In the automatic bath operation, the hot water in the bathtub 7 is automatically poured (and chased) to reach the set water level and the set temperature based on the set temperature and the set amount of hot water (set water level). After the completion of hot water filling, it means an automatic heat retention operation that automatically keeps the heat until the heat retention time elapses so as to maintain the set water level and the set temperature. The repelling operation means that the hot water in the bathtub 7 is circulated with the bath heat exchanger 41 to heat it. The hot water operation means that a set amount of hot water or water is poured into the bathtub 7. Each operation is executed based on the control of the hot water storage control unit 55.

The communication unit 94 (intercom) communicates with the kitchen remote controller 10 to make a call between the person in the bathroom 6 and the person in the kitchen.

The pyroelectric sensor 98 detects the presence or absence of a person in the bathroom 6 by detecting the amount of temperature change of the heat source in the detection area. Specifically, the pyroelectric sensor 98 detects whether or not there is a person in the bathroom 6 (whether or not it is moving) by detecting a temperature change in the detection area when a person moves or by moving a limb or the like. To detect. In the present embodiment, the pyroelectric sensor 98 functions as a motion sensor that detects the presence or absence of a person based on the amount of temperature change in the bathroom 6.

Here, FIG. 3 is a diagram for explaining a detailed configuration of the pyroelectric sensor 98.

The pyroelectric sensor 98 outputs the detected value to the hot water storage control unit 55 via the first amplifier circuit 98a or the second amplifier circuit 98b. The first amplifier circuit 98a and the second amplifier circuit 98b amplify the detected value output from the pyroelectric sensor 98. The first amplifier circuit 98a has a smaller amplification factor than the second amplifier circuit 98b. Therefore, the detected value output via the first amplifier circuit 98a is smaller than the detected value output via the second amplifier circuit 98b, and the threshold value when output via the second amplifier circuit 98b. Even if the value exceeds, the threshold value may not be exceeded. As a result, the sensitivity of the pyroelectric sensor 98 is reduced. The hot water storage control unit 55 controls the amplification factor of the detected value by switching between the first amplifier circuit 98a and the second amplifier circuit 98b by the switch 98c. Specifically, the hot water storage control unit 55 switches the switch 98c to the second amplifier circuit 98b side at normal times, and switches to the first amplifier circuit 98a side when it is desired to lower the detection sensitivity.

The bath remote controller control unit 97 has a logic circuit such as an MPU, and electrically controls each unit of the bath remote controller 5 according to a program stored in advance while referring to the memory. For example, the bath remote controller control unit 97 receives an instruction signal of the switches 93 and a signal from the hot water storage control unit 55, and causes the display unit 91 to display necessary information predetermined.

The shower 8 and the faucet 9 are provided in the bathroom 6 or in the kitchen or washroom outside the bathroom 6. The hot water supply pipe 24 is branched on the downstream side of the flow rate adjusting valve 28, and supplies hot water to the shower 8 and the faucet 9 provided in the bathroom 6 and the shower 8 and the faucet 9 in various places outside the bathroom 6 in parallel.

The kitchen remote controller 10 is a remote controller installed in a place other than the bathroom, for example, in the kitchen. The kitchen remote controller 10 has a display unit 101, a speaker 102 (FIG. 2), switches 103, a telephone unit 104 (FIG. 2), a kitchen remote controller control unit 107, and the like, which have almost the same functions as the bath remote controller 5. have. The kitchen remote controller control unit 107 has a logic circuit such as an MPU, and electrically controls each part of the kitchen remote controller 10 according to a program stored in advance while referring to a memory. For example, the kitchen remote controller control unit 107 receives an instruction signal of the switches 103 and a signal from the hot water storage control unit 55, and causes the display unit 101 to display necessary information predetermined.

The hot water storage control unit 55, the heating control unit 62, the bath remote control control unit 97, and the kitchen remote control control unit 107 are connected to each other so that necessary information can be transmitted and received.

The hot water supply device 1 in the present embodiment has a notification function of grasping the situation of a person in the bathroom 6 and notifying a person in the bathroom 6 and a person outside the bathroom 6 such as a cohabitant to that effect. Specifically, the hot water supply device 1 monitors the time from bathing in the bathtub 7 to bathing, and if bathing is not detected even after the preset notification time has elapsed, the bather and the outside of the bathroom 6 Notify people. In order to realize such a notification function, the hot water supply device 1 detects the entry and exit of a person into the bathroom 6 by the pyroelectric sensor 98, and detects the bathing and exiting of the person's bathtub 7 by the water level sensor 48. ..

However, the pyroelectric sensor 98 detects the presence or absence of a person in the bathroom 6 by detecting the amount of temperature change of the heat source in the bathroom 6. That is, the pyroelectric sensor 98 detects the presence or absence of a person based on the temperature change based on the movement of the person who is the heat source. Therefore, when there is a moving heat source other than a person in the bathroom 6, the pyroelectric sensor 98 detects the temperature change of the heat source other than the person and erroneously detects that there is a person in the bathroom 6. Specifically, when the bathtub 7 is not filled with hot water or the bathtub 7 is filled with low-temperature hot water and the bathtub 7 is filled with hot water, the pyroelectric sensor 98 is used. There is a risk of false detection if there is a person. In this case, the above-mentioned notification function may not operate properly, and the necessary notification of the bather's situation may not be performed.

On the other hand, the hot water supply device 1 in the present embodiment controls the detection sensitivity of the pyroelectric sensor 98 according to the situation in the bathroom 6 so that the false detection of the pyroelectric sensor 98 does not occur. Specifically, from the start of automatic bath operation (hot water) to the completion of hot water (a predetermined period after the start of hot water), the poured hot water should not be falsely detected as a person. The detection sensitivity of the pyroelectric sensor 98 is lowered. Hereinafter, it will be described with reference to a flowchart.

FIG. 4 is a flowchart illustrating the amplification factor switching process executed by the hot water supply device 1 in the present embodiment. At the start of this process, the switch 98c will be described as being switched to the second amplifier circuit 98b side.

In step S1, the hot water storage control unit 55 determines whether or not the automatic bath operation has been started. The automatic bath operation is started when, for example, an instruction to start the automatic bath operation is received via the automatic bath operation switches (switches 93, 103) of the bath remote controller 5 or the kitchen remote controller 10. When the hot water storage control unit 55 determines that the automatic bath operation has not been started (No in step S1), the hot water storage control unit 55 waits until the automatic bath operation is started.

When the hot water storage control unit 55 determines that the automatic bath operation has started (Yes in step S1), the hot water storage control unit 55 switches the switch 98c to the first amplifier circuit 98a in step S2. As a result, the pyroelectric sensor 98 has a small amplification factor and a low detection sensitivity. Immediately after the start of automatic bath operation, it is unlikely that a person will enter the room and wash or take a bath in the bathroom 6. Therefore, the amplification factor (detection sensitivity) is set to a value that enables detection of a large movement of a person (for example, a movement of walking in the bathroom 6) such as a person entering (leaving) a room. On the other hand, the amplification factor is set to a value that does not detect small movements such as a person sitting on a chair and washing his body or a movement while taking a bath. Therefore, the hot water storage control unit 55 detects only large operations such as entering and leaving the room, and does not erroneously detect the hot water to be poured.

In step S3, the hot water storage control unit 55 primes the bath circulation pump 50. That is, the hot water storage control unit 55 opens the hot water beam on-off valve 35 and distributes hot water to the bath circulation circuit 40. In step S4, the hot water storage control unit 55 confirms the remaining hot water in the bathtub 7. That is, the hot water storage control unit 55 confirms the remaining hot water based on the presence or absence of circulation of hot water in the bath circulation circuit 40 based on the detection result of the flowing water switch 51.

In step S5, the hot water storage control unit 55 pours hot water (hot water) so that the hot water in the bathtub 7 reaches the set water level and the set temperature based on the bath set temperature and the set hot water amount. At this time, if the remaining hot water is confirmed in the remaining hot water confirmation step S4, the remaining hot water is poured in consideration of the remaining hot water amount. In step S6, the hot water storage control unit 55 ends the pouring of the amount of hot water determined in the hot water pouring start step S5.

In step S7, the hot water storage control unit 55 acquires the water level in the bathtub 7 detected by the water level sensor 48. In step S8, the hot water storage control unit 55 determines whether or not the hot water in the bathtub 7 has reached the set water level. When the hot water storage control unit 55 determines that the set water level has not been reached (No in step S8), the process returns to the hot water pouring start step S5, and the water level determination step S8 is repeated from the hot water pouring start step S5 until the set water level is reached. On the other hand, when the hot water storage control unit 55 determines that the set water level has been reached (Yes in step S8), the hot water filling is completed in step S9.

In step S10, the hot water storage control unit 55 switches the switch 98c to the second amplifier circuit 98b. As a result, the pyroelectric sensor 98 has a higher detection sensitivity (becomes a normal detection sensitivity) than the period during which the pyroelectric sensor 98 was switched to the first amplifier circuit 98a side. As a result, the hot water storage control unit 55 can detect a small operation expected from entering the room to leaving the room. In step S11, the hot water storage control unit 55 performs an automatic heat retention operation so as to maintain the set water level and temperature. The automatic heat insulation operation ends when a predetermined time elapses or an instruction to end the automatic bath operation is received. The process returns to step S1, and the subsequent processes are repeated.

As a result, it is assumed that the hot water supply device 1 performs the hot water being poured by the pyroelectric sensor 98 from the time when the person enters the bathroom 6 to the time when the person leaves the bathroom 6 in a situation where it is unlikely that a person is in the room. It is possible to reduce false detection as a small operation. In particular, the hot water supply device 1 is preferable by executing the amplification factor switching process at a timing when erroneous detection is likely to occur at the time of hot water filling in which hot water is poured into the cold bathtub 7 without being filled with hot water. False positives can be suppressed. Therefore, the hot water supply device 1 can suitably grasp the situation of a person in the bathroom 6, and can improve the usability of the user's notification function.

In FIG. 4, the hot water storage control unit 55 starts automatic bath operation (hot water) in a situation where a temperature change occurs due to a heat source other than a person (a predetermined period after the hot water is started). During this period, the switch 98c was switched to the first amplifier circuit 98a side until the hot water filling was completed. However, the hot water storage control unit 55 may switch the switch 98c to the first amplifier circuit 98a side during the period when the hot water beam on-off valve 35 that controls the flow of hot water has a particularly large temperature change. That is, the hot water storage control unit 55 executes the switching step S2 after the pouring start step S5 is started or immediately before the start to lower the detection sensitivity, and after the pouring end step S6 is completed, executes the switching step S10 for detection. You may increase the sensitivity.

When the bath circulation pump 50 operates from the bath automatic operation start step S1 to the hot water filling completion step S9, the bath circulation pump 50 that circulates hot water operates in addition to the period when the hot water beam on-off valve 35 is open. During this period, the hot water storage control unit 55 may switch the switch 98c to the first amplifier circuit 98a side. This is because it is considered that the temperature change is large as in the period when the hot water beam on-off valve 35 is open. When the bath circulation pump 50 operates, it is while the priming step S3 is being executed. Further, in the case of expelling the poured hot water (hot water in the bathtub 7) in order to bring the hot water in the bathtub 7 to the set temperature in the water level determination step S8, the expulsion is being executed.

Further, during the period from the bath automatic operation start step S1 to the hot water filling completion step S9, in addition to the period when the hot water beam on-off valve 35 is open, the flowing water switch 51 as a distribution detection unit detects that hot water is flowing. During the period, the hot water storage control unit 55 may switch the switch 98c to the first amplifier circuit 98a side. This is because it is considered that the temperature change is large as in the period when the hot water beam on-off valve 35 is open.

Further, when the hot water flow rate sensor 33 as a flow rate detecting unit for detecting the amount of hot water poured into the bathtub 7 detects that the circulation port 7a of the bathtub 7 has poured the amount of hot water that can be considered to be submerged, the second amplifier circuit It may be the timing of switching (returning) to the 98b side (step S10), that is, the timing of the end of a predetermined period. At this time, as the start timing of the predetermined period, the bath automatic operation start step S1 or the pouring start step S5 can be used.

Further, the hot water storage control unit 55 is executing a hot water pouring operation other than the automatic bath operation (such as an operation of simply pouring hot water of a set amount and a set temperature, or a case where the user manually pours hot water from the curan 9). During the period, the switch 98c may be switched to the first amplifier circuit 98a side. For example, when the user manually injects hot water from the curan 9, when the amplification factor switching process is executed, the amount of hot water poured from the curan 9 of the switches 93 reaches a predetermined amount corresponding to the completion of the hot water filling. It has a switch that receives an instruction to notify the fact with the bath remote controller 5 or the kitchen remote controller 10. The hot water storage control unit 55 may accept this instruction, or detect that the hot water supply flow rate sensor 26 has started hot water supply after receiving the instruction, as the start timing of the predetermined period. Further, the hot water storage control unit 55 considers that all the hot water from the faucet 9 after receiving the instruction has been poured into the bathtub 7, and the amount of hot water poured has reached a predetermined amount corresponding to the completion of the hot water filling. The hot water supply flow rate sensor 26 may detect the above as the end timing of the predetermined period.

Further, the detection sensitivity of the charcoal sensor 98 may be switched between three or more amplifier circuits as needed, and the detected value may be output via the amplifier circuit or not output via the amplifier circuit. You may switch with. Further, the detection sensitivity of the pyroelectric sensor 98 may be lowered by raising the threshold value of the amount of temperature change for detecting the presence of a person. Moreover, not only the detection sensitivity may be lowered, but also the detection itself may be invalidated.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

The hot water supply device that executes the amplification factor switching process of FIG. 4 is not only the hot water supply device 1 that executes the above-mentioned notification function, but also a hot water supply device having a motion sensor that detects the presence or absence of a person based on the amount of temperature change in the bathroom. It can be applied to all.

The bathing / exiting sensor described by taking the water level sensor 48 as an example may be a weight sensor arranged in the lower part of the bathtub 7, a CCD image sensor that detects the presence or absence of a person in the bathroom 6 by image processing, an area sensor, a thermography, or the like. ..

The remote controller outside the bathroom described by taking the kitchen remote controller 10 as an example may be a remote controller installed in a place other than the kitchen such as a living room.

Further, the hot water supply device 1 has an electric heater type heating means in the hot water storage tank 11 instead of the heat pump unit 4, and has an instantaneous heat exchanger (bath heat exchanger) for heating with a gas burner or an oil burner. Alternatively, it may have a waste heat recovery device for a cogeneration system.

1 Hot water storage type bath water heater (hot water heater)
3 Hot water storage tank unit 4 Heat pump unit 5 Bath remote control 6 Bathroom 7 Bathtub 10 Kitchen remote control 48 Water level sensor 55 Hot water storage control unit 91, 101 Display unit 92, 102 Speaker 93, 103 Switches 94, 104 Call unit 97 Bath remote control control unit 98 Focus Electric sensor 107 Kitchen remote control control unit

Claims (6)

A motion sensor that detects the presence or absence of a person based on the amount of temperature change in the bathroom,
A hot water pouring control unit that pours hot water into the bathtub in the bathroom
A bath water heater including a sensitivity control unit that reduces the detection sensitivity of the motion sensor or invalidates the detection for a predetermined period after the start of the hot water filling. The bath water heater according to claim 1, wherein the sensitivity control unit reduces the detection sensitivity of the motion sensor or invalidates the detection during the period from the start of the hot water beam to the completion of the hot water beam. The sensitivity control unit reduces the detection sensitivity of the motion sensor or invalidates the detection during the period when the valve for controlling the flow of hot water provided in the pipe connected to the bathtub is open. Item 1. The bath water heater according to item 1. The sensitivity control unit claims that the detection sensitivity of the motion sensor is further lowered or the detection is invalidated during the period during which the pump for circulating the hot water provided in the pipe connected to the bathtub is operating. Item 3. The bath water heater according to item 3. The sensitivity control unit ends the predetermined period when the flow rate detecting unit that detects the amount of hot water poured into the bathtub detects that the circulation port of the bathtub has been poured with the amount of hot water that can be considered to be submerged. The bath water heater according to claim 1. Claims 1 to 5 that the sensitivity control unit lowers the detection sensitivity by reducing the amplification factor of the detection value output from the motion sensor or raising the threshold value for detecting the presence of a person. The bath water heater according to any one of the above.

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