JP2003056902A - Monitoring device for dropping accident into bathtub, and bath water heater provided therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitoring device for dropping accident into a bathtub capable of preventing a drowning accident of infants dropping into a bathtub, and further provide a bath water heater equipped therewith. SOLUTION: When an operation switch of a bath is off, a water level in a bathtub 5 is detected by a water level sensor 43 to monitor it. When water increases to such level as amounting to the volume of infants, it is judged that there occurs a dropping accident of infants into the bathtub, and alarming is rung.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bathtub fall accident monitoring apparatus for monitoring the occurrence of an accident in which an infant falls into a bathtub, and a bath water heater including the same.

[0002]

2. Description of the Related Art Accidents such as an infant falling into a bathtub and drowning have occurred. Such accidents are concentrated in infants of 1 and 2 years old, and almost no accidents occur in 3 years old. Experiments have shown that it is effective to have a bathtub edge height of 50 cm or more in order to prevent accidents of infants 1 and 2 years old falling into the bathtub. As people's preference for lower tanks is increasing,
Most of the bathtub rim heights are 45 cm or less due to the influence of JFC's financing standards as a barrier-free measure during new construction.

Most of the accidents occur during the daytime when the bath is not taking place, and it is a great feature that the infants enter the bathroom when the parents take their eyes off and the accident occurs. In rare cases, parents and children enter the bathroom to take a bath, and the child responds by telephone when they leave the bathroom with the intention of returning immediately, or when the parent notices that they are washing their hair. There are also reports of bathing cases that were said to have floated.

In terms of cost, and in consideration of the fact that the barrier-free needs to be prioritized due to living together with the elderly and the like, it is practically possible to replace the bathtub with a bathtub of 50 cm or more. I can't say. Therefore, for consumers, (1) the remaining hot water in the bathtub is drained.
(2) Lock the outside key at a place where children cannot reach, such as a bathroom door or entrance to a dressing room. (3) Countermeasures such as covering the bathtub with a stiff, non-slip bath lid while pouring hot water into the bathtub have been proposed. In addition, the bathroom lock automatic detection system that can detect whether the bathroom key is locked in the living room or kitchen, and the automatic door opening and closing that can detect whether the bathroom door is closed in the living room or kitchen etc. The need for new auxiliary devices for accident prevention, such as detection systems, has been suggested.

Further, as a device for watching the safety while bathing,
Assuming a situation in which an elderly person cannot move due to sudden illness while bathing, monitor the water level fluctuation after the bath level rises and the bath is sensed, and if there is no water level fluctuation for a predetermined time after bathing, it is abnormal. There is also proposed a device for notifying as (Japanese Patent Application Laid-Open No. HEI-3)
-111888 publication).

[0006]

The proposed new auxiliary device aims at keeping the door of the bathroom closed so that infants cannot enter the bathroom, but it opens the door for ventilation of the bathroom. There is also a desire to keep it. Further, since the door is always opened and closed when taking a bath, the operation of monitoring the locked state and the opening and closing of the door must be turned on and off each time, which complicates the operation. Furthermore, since it has to be turned on and off every time, there is a possibility that the operator turns off the monitoring operation.

In addition, accidents of infants often occur during the daytime when the bath is not in use, and the operation SW (switch) of the remote controller, which determines the operation ON-OFF of the bathtub, is often OFF. When the operation SW (switch) is OFF, the operation SW (switch) of the remote control is O
It monitors whether or not it is in the N state, and other functions are suspended. Also, the remote controller itself monitors whether or not various buttons on the remote controller are pressed, and the notification function and the like are suspended except for some functions such as the clock function. Therefore, even if the operation SW (switch) of the remote control is turned on throughout the day so that the proposed device for watching safety while bathing can always monitor the water level in the bathtub It is assumed that the baby will not be too late on the assumption that his / her breathing will not stop even if he / she feels bad while taking a bath, so the baby is not bathing (when the remote control is OFF,
In the case where the pressure sensor is turned off), the drowning water drowns, that is, in an accident involving a baby who is directly connected to respiratory arrest, it was difficult to notify within 2 minutes when the resuscitation rate is high.

The present invention has been made by paying attention to the problems of the prior art as described above, and a bathtub fall accident monitoring device and a bath provided therewith capable of preventing a drowning accident due to a fall of a baby bathtub. The purpose is to provide a water heater.

[0009]

The gist of the present invention for achieving the above object resides in the inventions of the following items. [1] In a bathtub fall accident monitoring device for monitoring the occurrence of an accident in which an infant falls into the bathtub (5), a water level detection means (43) for detecting the water level in the bathtub (5) and a water level in the bathtub (5). And a judging means (100) for judging that a baby's bathtub fall accident has occurred when there is a water level rise corresponding to a predetermined standard amount of water, and a bathtub fall accident monitoring device.

[2] In a bathtub fall accident monitoring device for monitoring the occurrence of an accident in which an infant falls into the bathtub (5), water level detection means (43) for detecting the water level in the bathtub (5) and the bathtub (5). And a determination means (100) for monitoring the water level in the room and determining that a baby's bathtub fall accident has occurred when the water level rise corresponding to a predetermined standard water amount is within a certain period of time. Bathtub fall accident monitoring device.

[3] The bathtub fall accident monitoring device according to [1] or [2], further comprising alarm means (113) for informing the occurrence of a bathtub fall accident of an infant.

[4] The bathtub fall accident monitoring device according to [3], wherein the alarm means (113) can be installed outside the bathroom.

[5] The determination means (100) further comprises a storage means (104) which stores in advance the relationship between the water level and the water amount in the bathtub (5), and the determination means (100) detects the water level detection means (43). The bathtub fall accident monitoring device according to any one of [1] to [4], wherein the water level is converted into a water amount based on the storage content of the storage means (104) and used for the determination.

[6] A bath water heater having the bathtub fall accident monitoring device according to any one of [1] to [5].

[7] The bath water heater according to [6], wherein the bathtub fall accident monitoring device is operated when the bath operation is set to OFF.

[8] The bath according to [7], characterized in that the standard amount of water used when it is determined that an infant has fallen into a bathtub accident is changed depending on whether the bath operation is off or on. Water heater.

[9] An instrument main body and a remote controller (110) are provided, and the remote controller (11
The remote controller (0) has at least an alarm means (113) for informing the occurrence of a bathtub accident of an infant and an operation switch (111) including an operation switch for turning on and off the operation of the bath. 11
0) is a normal operation state when the operation of the bath is set to ON by the operation switch as the operation state,
A standby operation state when the operation of the bath is set to off by the operation switch, the standby state includes at least a monitoring function of the operation switch, and has a part of effective functions as compared with the normal operation state. In the standby state in which the appliance main body enables only some limited functions including the bathtub fall accident monitoring device when the bath operation is set to off by the operation switch. When the occurrence of a bathtub fall accident of an infant is detected by the bathtub fall accident monitoring device, the signal indicating that fact is transmitted to the remote controller, and the remote controller is the signal from the appliance body. When receiving the message, the standby state is changed to the normal state, and the occurrence of a bathtub fall accident of an infant is detected by the alarm means (113). Bath water heater according to any one of [8] from wherein [6] to be reported.

The present invention operates as follows. The water level in the bathtub (5) is monitored by the water level detection means (43),
When there is a rise in the water level corresponding to a predetermined standard amount of water, it is determined that a baby's bathtub fall accident has occurred. When an infant falls in a bathtub, an alarm means such as a buzzer (11
Notify by 3). The standard amount of water may be determined based on the body volume of infants aged 1 and 2. That is,
Since the volume of the washbasin is approximately 2 to 3 liters, the volume of an infant is approximately 7.6 to 13.4 liters, and the volume of a person (for example, a 5-year-old or older) who can bathe is approximately 14.8 liters or more. , A temporary rise in the water level by drawing water out of the bathtub with a washbasin, a rise in the water level when an infant falls, and a normal bathing (including bathing only for children not bathed by parents) Water level rise can be clearly distinguished based on the amount of water.

In this way, the occurrence of a fall accident in the bathtub (5) is detected based on the rise in the water level corresponding to the falling water of an infant, so that even if the bathroom door is opened for ventilation or the like, drowning due to the fall occurs. Accidents can be prevented.

Further, in the case of judging that a baby's bathtub fall accident has occurred when the water level rise corresponding to the standard water amount is within a certain time, it is possible to take into account whether or not the water level changes suddenly. It is possible to detect the occurrence of a fall accident even during filling of water.

If the alarm means (113) can be installed in a place other than the bathroom, if it is installed in the living room, kitchen, or the like, a more reliable notification can be given.

The relationship between the water level and the amount of water in the bathtub (5) is stored in the storage means (104) in advance, and the water level detected by the water level detection means (43) is based on the stored contents of the storage means (104). In the case of converting the water level into a water amount and using it for the determination, the relationship between the water level and the water amount can be accurately recognized regardless of the shape of the bathtub (5).
It can be detected accurately. In the case of a bath water heater, when pouring water into the bathtub (5) for the first time after installation of the equipment, the relationship between the water level detected by the water level sensor and the pouring amount is measured, and the measurement result is stored in the nonvolatile RAM. For example, the relationship between the water level and the water amount is registered according to the above.

In addition, since the bathtub (5) is usually covered to keep warm while the bath is in operation, the bath waterfall has a tub fall accident when the bath operation is set to OFF. It is advisable to perform a water level monitoring operation to prevent this. As a result, the on / off operation of the monitoring operation can be combined with the on / off operation of the bath operation, improving operability and
It is possible to prevent forgetting to turn on the monitoring operation.

In addition, when the monitoring operation is performed even when the bath operation is on, the criteria used when it is determined that the baby bathtub accident has occurred depending on whether the bath operation is off or on. Change the amount of water.

In the bath water heater having the appliance body and the remote controller, the remote controller (11
In 0), when the bath operation is set to ON by the operation switch, the normal operation state in which almost all the functions of the display unit and the operation switch are enabled is entered. On the other hand, when the bath operation is set to OFF by the operation switch, the standby operation state in which the effective functions are limited to at least a part including the operation switch monitoring function is entered. In the standby operation state, for example, only the monitoring function of the operation switch and the communication function with the instrument body are enabled and the other functions are suspended.

When the bath operation is set to off, the appliance body has a function of monitoring whether the operation switch is turned on (a function of receiving a predetermined signal from the remote controller and inspecting it) and a bathtub fall. Enter the standby state of the main unit to activate only some limited functions, such as operating only the accident monitoring device. When the bathtub fall accident monitoring device detects the occurrence of a bathtub fall accident of an infant under this condition, the appliance body sends a signal indicating that fact to the remote controller (1
10).

When the remote controller (110) receives the previous signal from the appliance body, the remote controller (110) shifts its operating state from the standby state to the normal state and informs the occurrence of a bathtub accident of an infant by the alarm means (113). To do. In this way, the remote controller shifts from the standby state to the normal state and issues an alarm action based on the signal sent from the appliance body when the occurrence of a bathtub accident of an infant is detected. The effective functions of the controller can be limited to only a part, making it easy to see when the operation is off and contributing to power saving.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. Bath water heater 10 according to the present invention
Has the function of supplying hot water to the faucet and pouring it into the bathtub,
It has a function to reheat the water in the bathtub and a fall warning function to detect and inform the fall of an infant. As shown in FIG. 1, a bath water heater 10 includes a reheating circulation circuit 20 for reheating a bath and a hot water supply circuit 3 for discharging hot water to a faucet or the like.
It has 0 and. The bath heat exchanger 21 through which the additional heating circulation circuit 20 passes and the hot water supply heat exchanger 31 through which the hot water supply circuit 30 passes are incorporated in a single can body, and are of a so-called one-can-two-water channel type. The bath heat exchanger 21 and the hot water supply heat exchanger 31 are heated by the burner 11.

The hot water supply circuit 30 is composed of a heat receiving pipe 32 that passes through the hot water heat exchanger 31 so as to be folded back, a water supply pipe 33 that communicates with a water supply source, and a hot water supply pipe 34 that communicates with a tap for tapping hot water. A water amount sensor 41 for detecting the water flow amount is arranged in the middle of the water supply pipe 33. In addition, a water thermistor, a water filter, etc. are attached to the water supply pipe 33.

The reheating circulation circuit 20 includes a heat receiving pipe 22 that passes through the bath heat exchanger 21 so as to be folded back a plurality of times, a return pipe 23 for returning water in the bathtub 5 to the bath heat exchanger 21 side, and a bath heat exchanger. Outgoing pipe 24 for guiding water after being heated by the exchanger 21 to the bathtub 5.
Composed of and. The circulation pump 4 is provided in the middle of the return pipe 23.
2 and a water level sensor 43 are attached. In addition, a bath water flow switch and a bath thermistor are attached to the return pipe 23, and a bath outward thermistor is attached to the outward pipe 24. The hot-water supply pipe 34 and the return pipe 23 are connected by a pouring pipe 52 having a pouring electromagnetic valve 51 on the way. The return pipe 23 and the forward pipe 24 are connected to circulating metal fittings attached to the bathtub 5 at positions relatively close to the bottom, and communicate with the inside of the bathtub 5.

The control circuit 100 of the bath water heater 10 is a CPU (central processing unit) 10 that plays a central role in various controls.
1 and RO that stores programs and various fixed data
An M (read only memory) 102, a RAM (random access memory) 103 for storing data and the like that are temporarily necessary for executing a program,
The non-volatile RAM 104 is the main part, and C
The PU 101 is connected to various solenoid valves, thermistors, and sensors shown in FIG. 1 through the input / output interface circuit 105, as well as a remote controller 110 such as a main remote controller installed in a kitchen or a bath remote controller installed in a bathroom. ing.

The remote controller 110 includes an operation unit 111 including an operation switch and the like, and a display unit 11 including a liquid crystal display and the like.
2 and a buzzer 113. The function as the determination unit is the CPU 10 that executes a predetermined program.
1 and the function as an alarm means is that the buzzer (or speaker) 113 provided on the main remote controller or the bath remote controller is
Is to fulfill.

Next, the operation will be described. When the equipment is installed, the relationship between the water level in the bathtub 5 and the water amount is stored in the nonvolatile RAM 10
4 is stored and registered. That is, when pouring hot water into the bathtub 5 for the first time after installation of the equipment, the relationship between the water level detected by the water level sensor 43 and the pouring amount is measured, and the measurement result is stored in the nonvolatile RAM 104. The pouring amount is measured based on the output of the water amount sensor 41. At the time of pouring, the pouring electromagnetic valve 51 is opened, pouring the hot water into the return pipe 23 from the hot water supply circuit 30 side through the pouring pipe 52, and the reheating circulation circuit 2
Hot water is supplied to the bathtub 5 through 0.

Even when the operation of the bath is in the off state, such as when the operation switch of the remote controller 110 is set to the off state or the operation is automatically turned off after the elapse of the specified time, the bath water heater 10 keeps the water level. The water level in the bathtub 5 is monitored based on the output of the sensor 43. When an infant falls into the bathtub 5, the water level in the bathtub 5 rises by the volume of the infant. When the control circuit 100 detects that the water level being monitored has risen by an amount corresponding to a predetermined reference water amount, it determines that an infant has fallen into the bathtub 5 and sounds the buzzer 113 to sound. Warn to that effect.

Here, it is set that the volume of 1- and 2-year-old infants is in the range of 7.6 liters to 13.4 liters. It is judged that the water level rises due to factors other than
It does not sound an alarm.

FIG. 2 shows an infant physical growth curve in 1990 announced by the Ministry of Health and Welfare. Figure 2a shows the boy's graph
Figure 2b shows the graph for the girl. Upper and lower solid lines 20
1a and 201b show the upper and lower limits of the region in which 94% of the children of each month and age enter, and broken lines 202a and 2b.
The area between the top and bottom of 02b is 80 for each month and age.
Shows the area where a percentage of children enter. Based on this graph, the range between the lower limit weight of 7.6 kg for 1 year old and the upper limit weight of 13.4 kg for 2 year old is set as the infant weight range of 1 and 2 years old, and the specific gravity is assumed to be 1. The volume range is set to 7.6 liters to 13.4 liters.

The alarm is set to be louder than the sound volume that is normally sounded when an error occurs, and is set to the maximum volume that can be output by the buzzer 113 in this embodiment. In addition, both the bath remote control and the main remote control sound an alarm and continue to sound until the reset switch is pressed.

The rate of increase in the amount of water may be monitored, and if the amount of water increases slowly above a certain level, it may not be determined that a fall accident has occurred. When the rate of rise of the water level is also taken into consideration in this way, for example, it is possible to distinguish between a slow rise in the water level due to filling the bathtub and a rapid rise in the water level due to the fall of an infant. It is possible to accurately detect the occurrence of a fall accident.

More specifically, in the present embodiment, S301 to S306 and S312, S31 of FIG.
As shown in FIG. 3, the operation SW (switch) of the remote controller 110 is turned off or the automatic button (tub 5
When there is no water, it is poured, when the water level drops, it is poured in timely, and in order to keep the set temperature of the remote controller 110, reheating is performed in time. Do not take a bath when the button that turns ON the setting for performing this operation for the predetermined set time is OFF (S3
02; No), the water level is constantly monitored (the pressure sensor (water level sensor 43) is always energized regardless of whether the remote control is ON or OFF), and a predetermined predetermined amount (equivalent to infant volume) of water level rise is detected. Then, the equipment itself turns on the operation SW (switch) of the remote controller 110 and makes a notification without monitoring the water level fluctuation state after the detection (only the notification circuit of the remote controller may be turned on).

The predetermined amount is previously set to the amount in which the water level rise from 7.6 liters to 13.4 liters occurs within 20 seconds, as described above, when no input is made. For normal use, the water level rises temporarily (for example, 2 to 3 liters) and water is poured into the bathtub (10 to 16 liters / minute = 3.3 to 5.3) when the water is drawn out by the washbasin.
(Liters / 20 seconds) and the like are conceivable, but if the water level rise of 7.6 liters to 13.4 liters / 20 seconds is set as a set value, it is possible to distinguish between falling water of infants and these, and avoid false notification. In addition, the minimum age for playing with brothers (sisters) in the bathroom is around 5 years old, so 5
It can be clearly distinguished from a rise in the water level of, for example, 14.8 liters based on the lower limit weight of an old child.

When the user is taking a bath, that is, when the remote control is ON or the automatic button is ON (S302; Yes), S
As shown in 307 to S311, S312, and S313, a set value different from that during non-bathing is used as the predetermined amount (corresponding to infant volume). For example, the amount of water level rise of 7.6 liter to 11.5 liter generated within 20 seconds is set in advance. After sensing this set value, an alarm is issued without monitoring the water level fluctuation situation. For normal use, the water level rises temporarily when pumping water out of the washbasin (for example, 2 to
3 liters) and pouring into the bathtub (10 to 16 liters / minute = 3.3 to 5.3 liters / 20 seconds) are possible, but in addition to this, when entering the bathroom to take a bath with parents and children. However, it is possible to envisage the case where only the child takes a bath (for example, a 3-year-old child), and another set value is provided to prevent an erroneous notification when the child takes a bath under the supervision of the parent.

For example, in the range of 11.5 to 13.4 liters (lower limit of 3-year-old children to upper limit of 2-year-old children), notification is given 1 to 2 minutes after the rise of the water level is detected (S310, S311). This may be because the parents clearly took their eyes off, or it may be too short for an adult to bathe, but it is clearly too long for a child to bathe. It may be monitored based on, but the notification is given even if the judgment cannot be made.

The alarm means may be an alarm,
Promote artificial respiration and cardiopulmonary resuscitation to upset parents, eg "Your child may have fallen into the water. Check the bathtub. If drowning, have CPR if necessary. It is preferable to play a voice guidance such as ".

The water level fluctuation may be monitored after sensing a predetermined amount of water level rise, but the monitoring time is preferably within 2 minutes. This is because the lifesaving rate drops sharply after 2 minutes from the Drinker lifesaving curve.

In the embodiment described above, the upper limit and the lower limit are set for the standard water amount, and the rate of increase of the water amount is added to the determination factor. However, it is determined that a fall accident has occurred based on the increase of the water amount above a certain level. Good. Especially, when the water level monitoring operation is performed when the bath operation switch is in the OFF state, it is possible to distinguish between normal water level rise when a person takes a bath and water level rise due to a bathtub accident of an infant. Since it is not necessary to do so, there is no problem even if it is determined that a bathtub fall accident has occurred simply by raising the water level above a certain level.

On the other hand, when the water level rise is within the upper and lower limits of the standard amount of water, or when the rate of water level rise is added to the judgment factor, the water level rise due to the bathing of a person and the water level based on the accidental fall of the bathtub of an infant. Because you can distinguish between rising
Not only when the bath operation switch is set to OFF, the fall accident occurrence monitoring operation may be performed at all times.

Further, in the embodiment, the relationship between the water level and the water amount is measured and stored to improve the accuracy.
Even if the relationship between the water level and the water amount is not actually measured, it is possible to detect the occurrence of a bathtub accident of an infant with a certain degree of accuracy. Especially, if the detection standard is set to the safe side, it is possible to clear the accuracy problem.

Besides, in the embodiment, the water level is monitored in the bath water heater, but only the part for monitoring the water level may be configured as a separate device in order to monitor the occurrence of a bathtub fall accident. For example, a device for detecting the water level depending on the upper and lower sides of the float may be attached to the wall surface of the bathtub with a suction cup or the like. In this way, if the bathtub fall accident monitoring device is independently configured, it is possible to retrofit the occurrence of a bathtub fall accident even if a bath water heater is already installed.

In the embodiment, the volume equivalent of the infant is set based on the weight of 80% of the infant growth curve of 1990 in which 80% of children fit.
May be based on a percentage that applies to children.
In addition, it is preferable to use the infant physical development data based on a newer tabulation. Furthermore, since the specific gravity of infants is lower than that of adults, it is desirable to consider this.

[0050]

According to the bathtub fall accident monitoring device and the bath water heater equipped with the same according to the present invention, the water level in the bathtub is monitored, and when there is a rise in the water level corresponding to the fall of a baby, a bathtub fall accident. It is possible to prevent a drowning accident due to a fall even when the bathroom door is opened for ventilation or the like because the alarm is sounded when it is determined that the occurrence has occurred. Further, if the alarm means can be installed in a place other than the bathroom, it is possible to give a more reliable notification to a person in the living room or kitchen.

Further, in the case of judging that a bathtub fall accident of an infant has occurred when the water level rise corresponding to the standard water amount is within a certain time, it is also possible to take into consideration whether or not the water level changes suddenly. The occurrence of a fall accident can be accurately detected even during filling of water.

In the case where the relationship between the water level and the water amount in the bathtub is stored in the storage means in advance, and the water level detected by the water level detection means is converted into the water amount based on the stored contents of the storage means and used for the determination, Since the relationship between the water level and the water amount can be accurately recognized regardless of the shape of the bathtub, it is possible to accurately detect the rise in the water level corresponding to the volume of the baby.

During bath operation, the bathtub is normally covered to keep warm, so in the bath water heater, when the bath operation is set to off, it is necessary to prevent the accident of the bathtub falling down. In the case of water level monitoring operation, the on / off operation of the monitoring operation can be combined with the on / off operation of bath operation,
The operability is improved and it is possible to prevent forgetting to turn on the monitoring operation.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a schematic configuration of a bath water heater according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an example of an infant physical growth curve.

FIG. 3 is a flowchart showing an operation performed by the bath water heater according to the embodiment of the present invention.

[Explanation of symbols]

5 ... Bathtub 10 ... Bath water heater 11 ... Burner 20 ... Additional circulation circuit 21 ... Bath heat exchanger 22 ... Heat receiving tube 23 ... Return pipe 24 ... Outgoing 30 ... Hot water supply circuit 31 ... Hot water heat exchanger 32 ... Heat receiving tube 33 ... Water pipe 34 ... Hot water supply pipe 41 ... Water quantity sensor 42 ... Circulation pump 43 ... Water level sensor 51 ... Pouring solenoid valve 52 ... Pouring pipe 100 ... Control circuit 110 ... remote control 111 ... Operation unit 112 ... Display 113 ... Buzzer

Continued front page    F-term (reference) 2D005 FA00                 3L024 EE12 FF04 FF08 FF16 GG12                       GG43                 5C086 AA22 AA46 BA04 CA17 CA30                       CB20 DA08 DA20 EA43 EA45                       FA02 FA17

Claims (9)

[Claims] 1. A bathtub fall accident monitoring device for monitoring the occurrence of an accident in which an infant falls into a bathtub. A water level detecting means for detecting the water level in the bathtub, and the water level in the bathtub are monitored to establish a predetermined standard water amount. And a determination means for determining that a baby's bathtub fall accident has occurred when there is a rise in the water level corresponding to the above. 2. A bathtub fall accident monitoring device for monitoring the occurrence of an accident in which an infant falls into a bathtub, and a water level detecting means for detecting the water level in the bathtub, and the water level in the bathtub is monitored, and a predetermined reference water amount is set. And a determination means for determining that a bathtub fall accident of an infant has occurred when the water level rise corresponding to the above is within a predetermined time. 3. The bathtub fall accident monitoring device according to claim 1 or 2, further comprising alarm means for informing the occurrence of a bathtub fall accident of an infant. 4. The bathtub fall accident monitoring device according to claim 3, wherein the alarm means can be installed outside the bathroom. 5. The storage device further stores in advance the relationship between the water level and the water amount in the bathtub, and the determination device determines the water level detected by the water level detection device as the water amount based on the stored contents of the storage device. The bathtub fall accident monitoring device according to any one of claims 1 to 4, which is converted and used for determination. 6. A bath water heater comprising the bathtub fall accident monitoring device according to any one of claims 1 to 5. 7. The bath water heater according to claim 6, wherein the bathtub fall accident monitoring device is activated when the bath operation is set to off. 8. The bath hot water supply according to claim 7, wherein the reference amount of water used when it is determined that an infant has fallen into the bathtub accident is changed depending on whether the bath operation is off or on. vessel. 9. An apparatus main body and a remote controller, wherein the remote controller includes at least an alarm means for notifying the occurrence of a bathtub fall accident of an infant and an operation switch including an operation switch for on / off operation of a bath. The remote controller has a normal operation state when the operation of the bath is turned on by the operation switch as its operation state and a time when the operation of the bath is turned off by the operation switch. There is a standby operation state, the standby state is an operation state including at least a monitoring function of the operation switch and limiting some effective functions as compared with the normal operation state, the appliance body, the operation When the bath operation is set to off by a switch, some limitations including the bathtub fall accident monitoring device When entering the standby state of the main body to enable only the function, and when the occurrence of a bathtub fall accident of an infant is detected by the bathtub fall accident monitoring device, a signal indicating that fact is transmitted to the remote controller. 9. The controller, upon receiving the signal from the appliance body, shifts from the standby state to the normal state, and notifies the occurrence of a bathtub fall accident of an infant by the alarm means. Bath water heater described in any one.