JPH11319438A - Bathtub water purification apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent backwashing from being started during bathing by prohibiting the backwashing of a cleaning tank during the detection bathing of a man or during the prescribed time since the bathing is no longer detected after once detection of the bathing of the man. SOLUTION: When the bathing of the man is detected by a bathing detecting means 32, the information is transmitted to a backwashing prohibition judgment means 44 which instructs a backwashing operation control means 28 to prohibit the start of the backwashing operation. Namely, the backwashing is prohibited during the bathing of the man even if the backwashing start conditions hold. Whether the person is under bathing or not is judged by the bathing detecting means 32. When the backwashing operation control means 28 judges that the integrated time of on of a pump 1 attains the prescribed time or above during the not bathing and a timing for starting the backwashing is reached, a selector valve control means 27 moves a selector valve 9 to a backwashing position and controls the operation of the pump 1 at a prescribed number of revolutions in the state, thereby executing the backwashing of the cleaning tank. When the backwashing of the prescribed time ends thereafter, the selector valve 9 returns to a purification operation position and the purification operation is started.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for purifying and keeping bath water.

[0002]

2. Description of the Related Art As an apparatus for purifying bath water, a bath water purifying apparatus having a bath water purifying / heating function will be described as an example.

[0003] Such a bathtub water purifying apparatus includes a pump for circulating bathtub water, a purifying tank for purifying bathtub water by filtering fine dust and dirt and impurities, and sterilizing bacteria contained in bathtub water. A sterilizer, a first thermistor for detecting the temperature of the bath water, a heater for keeping the bath water at a predetermined temperature, a second thermistor for detecting the temperature around the heater, and an abnormal rise in the temperature around the heater The temperature fuse that cuts off the power to the heater when the heater is turned off, the direction in which the bathtub water is purified by circulating the bathtub water in the forward direction to the septic tank, and the direction in which the bathtub water is purified and circulated through the septic tank are opposite to each other. The switching valve is configured to switch the direction to a direction in which impurities adhering to the septic tank are discharged using bath water in the bath and the septic tank is back-washed.

Power is supplied to the heater so that the temperature of the bath water is maintained at a temperature that allows bathing at any time, and the back washing is automatically performed at predetermined time intervals measured by a timer or the like. Is what is done.

[0005]

By the way, in the above-mentioned bathtub water purifier, the bathtub water purification / heat keeping operation can be performed irrespective of the use conditions of the user, that is, the bathing time and the number of bathers (number of times). The method of backwashing the septic tank and the like was generally fixed to a method according to standard use conditions assumed in advance.

[0006] For this reason, a person may start backwashing the septic tank while taking a bath, and the discharge of the blow from the bath adapter may be interrupted, or the water level may drop due to the discharge of the bathtub water. I decided to do it.

Further, even when the number of times of bathing by a person is less than the standard use condition and the septic tank is not contaminated and backwashing of the septic tank is not necessary, the backwash of the septic tank is performed in a fixed reverse washing mode in advance. Each time a certain amount of bath water was drained.

Further, since the pump rotates and purifies and circulates, noise is generated to a greater or lesser degree, and some users feel noisy and feel uncomfortable.

[0009] In addition, the bathtub water is kept warm for 24 hours despite the long periods of non-bathing time, so that most of the energy required for keeping the temperature was spent on heat dissipation.

[0010]

SUMMARY OF THE INVENTION A bathtub water purifier according to a first aspect of the present invention includes a pump for circulating bathtub water, a purifier for filtering fine dirt and dirt impurities from the bathtub water, and a bathtub water purifier. A switching valve for switching a flow path of the bathtub in a predetermined direction, purifying the bathtub water by circulating the bathtub water in a forward direction with respect to the purification tank, switching the path of the switching valve, and switching the bathtub water to the purification tank. In a bath tub water purification device for discharging impurities adhering to the septic tank by flowing in the opposite direction and back-washing the septic tank, the apparatus is provided with bathing detecting means for detecting human bathing, while detecting human bathing, or It is characterized in that the backwashing of the septic tank is prohibited for a predetermined time after detecting the bathing of a person once and then detecting the bathing of the person.

[0011] According to the above configuration, since the backwashing is started during bathing, the discharge of the blow from the bath adapter is interrupted, and the water level is lowered due to the discharge of the bathtub water. Can be avoided.

[0012] Further, when the bathing of a person is detected while backwashing the septic tank, the backwash is terminated.
Backwashing is reliably prevented from being performed during bathing, and discomfort to the bather can be reliably avoided.

Further, when a bathing of a person is detected during backwashing of the septic tank, the backwashing is temporarily interrupted, and when a predetermined time elapses after detecting no bathing of a person, the backwashing of the septic tank is restarted. By doing so, it is possible to prevent continuous use of the apparatus while the backwash is insufficient and the septic tank is dirty.

A bathtub water purifying apparatus according to a second aspect of the present invention includes a pump for circulating bathtub water, a purifying tank for filtering fine dirt and contaminants from the bathtub water, and a bathtub water flowing path defined by a predetermined path. A switching valve for switching between the directions, purifying the bathtub water by circulating the bathtub water in the forward direction with respect to the septic tank, switching the path of the switching valve, and flowing the bathtub water in the reverse direction with respect to the septic tank. In a bath tub water purification device for discharging impurities adhering to a septic tank and back washing the septic tank, a back washing mode storing means for storing a plurality of back washing modes, and one of the plurality of back washing modes. Backwash mode selecting means for selecting, bathing detecting means for detecting bathing, and a number of bathers counting means for counting the number of bathers detected by the bathing detecting means within a predetermined time, And selects one of the plurality of backwash mode based of the output from the bather number measuring means.

[0015] According to the above configuration, the state of dirt in the septic tank is estimated from the number of bathers, and the optimum reverse cleaning mode is always automatically selected, so that the water quality of the bathtub is not reduced and the reverse cleaning is performed. Tub water discharge can be minimized.

A bathtub water purification apparatus according to a third aspect of the present invention includes a pump for circulating bathtub water, a purification tank for filtering fine dirt and impurities from the bathtub water, and a bathing detection for detecting bathing of a person. Means for switching the number of rotations of the pump when a person's bathing is detected.

According to the above configuration, for example, while detecting the bathing of a person, the level of the noise generated by the circulation of the bathtub water can be reduced by reducing the rotation of the pump. Can avoid being uncomfortable.

A bathtub water purifying apparatus according to a fourth aspect of the present invention comprises a pump for circulating bathtub water, bathtub water heating means for heating and keeping bathtub water, and a bathtub water temperature detection for detecting bathtub water temperature. Means for detecting bathing of a person, and means for controlling energization of the heating means in accordance with a time zone calculated based on an output from the bathing detection means.

According to the above configuration, the time period during which a person takes a bath is estimated without energizing the heater continuously for 24 hours, and the heater is supplied to the heater so that the bathtub water has an appropriate temperature for bathing in accordance with the time period. Power can be controlled, leading to power saving.

At this time, the time period may be a sum of a time period before a predetermined time period and a predetermined time period after the bathing time start time of one or more persons detected in the past. By energizing the heating means so that the temperature of the bath water becomes a predetermined temperature, the temperature of the bath water can be controlled to an appropriate temperature during bathing.

Further, when a bather is detected during the time period, the energization of the heating means is stopped based on the detection of the bathing of a person being stopped thereafter, or the number of bathers is set to a predetermined number during the time period. When the number of people is reached, if the power supply to the heating means is stopped based on the detection of the bathing of the person being stopped thereafter, the actual use time is added to the estimated bathing time zone, It is possible to further save power.

The predetermined number of persons may be calculated on the basis of the number of bathers per day, or the energization of the heating means may be performed in accordance with the time period without reaching the predetermined number of persons. Stopping is suitable for use by a plurality of people.

A bathtub water purifying apparatus according to a fifth aspect of the present invention comprises: a purifying tank for filtering fine dirt and impurities from bathtub water; and a load such as a pump for changing a bathtub water circulation state to the purifying tank. A bath detecting means for detecting a bathing of a person is provided, and an operation state of the load is changed according to a time zone calculated based on an output from the bath detecting means.

According to the above configuration, the time period during which a person takes a bath is estimated, and in that time period, the operation state of a load such as a pump is controlled so that bath water circulates in a state suitable for bathing. When the operation state of the load of the pump or the like becomes a circulating state of bathtub water that is not suitable for bathing, it can be executed outside the above-mentioned time period, and it is possible to prevent unpleasant feeling during bathing.

[0025]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a system configuration diagram of a bathtub water purifying apparatus having a bathtub water purifying / heating function according to an embodiment of the present invention.

In FIG. 1, a bathtub water purifying apparatus includes a pump 1 for circulating bathtub water, a water flow switch 2 for detecting whether or not bathtub water is circulating at a predetermined flow rate or more due to clogging or the like; A purifying tank 3 for purifying, a sterilizing device 4 for disinfecting bath water, a first thermistor 5 for detecting the temperature of bath water, a heater 6 for keeping the bath water at a predetermined temperature, and detecting a temperature around the heater. A second thermistor 7, a temperature fuse 8 for shutting off power supply to the heater when the temperature around the heater rises abnormally, a switching valve 9 for switching between a direction of circulating bath water and a direction of back washing of the septic tank, When the septic tank is back-washed, a drain port 10 for draining the washing water is provided.
Outgoing pipe 11 for sending purified / sterilized / heat-retained bathtub water to bathtub 16, return pipe 12 for sending bathtub water in the bathtub to functional unit 17, bus adapter 13, and air for sending foam into the bathtub. A solenoid valve 14, an operation unit 18 for operating these systems, a control unit 15 for controlling the entire system,
Consists of

The septic tank 3 is filled with active stone, activated carbon, or the like, and used as an adsorption filter, or is made of a woven or non-woven filter material.
It removes fine dust and impurities that become dirty.

The sterilizer 4 includes an ozone sterilizer, an ultraviolet sterilizer, and the like. The ozone sterilizer includes an ozone generating unit and an ozone mixing unit that mixes ozone into water. The ultraviolet sterilizer is provided with an ultraviolet lamp in a water passage of the bathtub water, and is configured so that the bathtub water passes while being irradiated by the ultraviolet lamp. Each of them is for sterilizing various bacteria such as Escherichia coli contained in bath water.

The pump 1 for circulating bath water is configured such that the pump control means can control the ON / OFF and the rotation speed of the pump 1. That is, for example, even if the power supply voltage applied to the pump fluctuates or varies, the rotation speed of the pump 1 can be kept constant, and the circulating flow rate of the bathtub water can be kept constant. In addition, the rotation speed can be switched according to the degree of contamination of the bathtub water, that is, the circulation flow rate of the bathtub water can be switched.

The heater 6 heats the bathtub water circulated by the pump 1 and is disposed at the entrance side of the bathtub water flow direction with respect to the heater 6 during the cleaning circulation operation (FIG. 2). The temperature of the bathtub water detected by the first thermistor 5 and the temperature set by the bathtub water temperature setting unit 35 are compared by the temperature comparison unit 36, and the heater control is performed so that the bathtub water temperature and the set temperature become the same. Means 37
Is controlled by

FIG. 2 is a view clearly showing the position of the switching valve and the passage of the bathtub water when the bathtub water is purified in the bathtub in the bathtub water purification apparatus.

In FIG. 2, bathtub water flows into the purification tank 3 in the order of the return pipe 12, the pump 1, the switching valve 9 (-), and the first thermistor 5, and is purified in the purification tank 3.
The water flow sw3, the switching valve 9 (-), the sterilizing device 4, and the outbound pipe 11 return to the bathtub 16 in this order.

FIG. 3 is a view clearly showing the position of the switching valve and the passage of the bathtub water when the septic tank is being backwashed in the bathtub water purification apparatus.

In FIG. 3, bathtub water flows into the purification tank 3 from the reverse direction in the order of the return pipe 12, the pump 1, the switching valve 9 (-), and the water flow sw3, and after washing the filter medium in the purification tank 3, The first thermistor 5 and the switching valve 9 (−) are discharged from the drain port 10 in this order.

FIG. 4 shows an embodiment of the operation unit 18. An operation switch 21 for determining whether or not to operate the bathtub water purification device, a heat retention switch 20 for determining whether or not to keep the temperature of the bathtub water at the temperature displayed on the set temperature display 22, and an air solenoid valve 14. Is turned on, a blow switch 19 for discharging air bubbles into the bathtub 16 and a set temperature change switch 23 for switching bathtub water temperature setting, and a bathing switch 51 for inputting that the user is bathing. When the switch 51 during bathing is pressed, the lamp 56 during bathing is turned on. While the bathing lamp 56 is lit, the bathing mode is set. In this state, if the bathing switch 51 is pressed, or if a predetermined time has elapsed since the bathing lamp 56 was turned on, the bathing lamp 56 is turned off. It is determined that bathing has been completed.

Next, a first embodiment of the present invention will be described. FIG. 5 is a control block diagram according to the present embodiment,
6, 7, and 8 are operation flowcharts. In FIG. 5, when the bathing detecting means 32 detects the bathing of a person, the information is transmitted to the backwashing prohibition judging means 44 to prohibit the backwashing operation control means 28 from starting the backwashing operation. In other words, during the bathing of a person, the backwash is not performed even if the backwash start condition is satisfied.

A specific flow will be described with reference to FIG. When the operation switch 21 is turned on, the pump 1 is turned on.
Then, circulation of bathtub water is started (S101), and the switching valve 9 is driven to the purification circulation position shown in FIG. 2 (S102). At this time, if the heat retention switch 20 shown in FIG. 4 is turned on, the heater 6 is ON / OFF controlled based on the set temperature signal set by the set temperature change switch 23 and the signal from the first thermistor 5, and the bathtub water is controlled. Is kept warm.

Then, it is judged by the bath detecting means 32 whether or not the bath is being taken. When the bath is not in the bath (S103N), the integrated time of the ON of the pump 1 has become equal to or longer than a predetermined time, and it is time to start the back washing. When the operation control unit 28 determines (S104Y), the switching valve control unit 27 moves the switching valve 9 to the reverse cleaning position shown in FIG. 3 (S105), and controls the operation of the pump 1 at a predetermined rotation speed in that state. The reverse cleaning of the septic tank 3 is performed (S106).

Thereafter, when the reverse cleaning for a predetermined time is completed (S107Y), the switching valve 9 returns to the cleaning operation position (S1).
02), the bathtub water purification operation is started again. In this way, if it is determined that the bathing is taking place even when the backwashing start time comes, the backwashing is not performed.

Another operation flow will be described with reference to FIG. In this flow, as compared with the flow shown in FIG. 6, it is determined whether or not the bathing is being performed by the bath detecting means 32 during the backwashing (S108). When the bather is detected during the backwashing, the backwashing is stopped. Then (S108Y), the normal purification operation is started. Therefore, it is possible to completely prevent the user from having to take a bath while the back washing is being performed.

Another operation flow will be described with reference to FIG. The difference of this flow from the flow shown in FIG. 7 is that when a bather is detected during the back washing and the back washing is stopped (S108Y), the back washing interruption flag is turned on (S114), and thereafter When it is detected that there is no bather in the state where the normal purifying operation is being performed (S102) (S103N), based on the fact that the backwash interruption flag is ON (S110-ON), the backwash interruption flag is set. The backwashing start timer (T1) is started at the same time as the turning off (S111), and the backwashing start timer is counted up (S112). When the backwashing start timer counts up, it is determined that there is no next bather because a predetermined time has elapsed since the bathing of a person is not detected. And resume backwashing. Of course, even if the predetermined time has not elapsed by omitting the processing of S113, the backwashing may be restarted immediately after the bathing of the person is no longer detected.

Here, the bath detecting means 32 is shown in FIG.
8. In addition to the detection of a sudden rise in the water level by the water level sensor shown in FIG. 19, the detection of a change in the amount of reflected light by the photoelectric sensor as shown in FIG. 20, and the like, as shown in FIG. 51 is provided, and it can be determined that the user is taking a bath by pressing a bathing switch when the user takes a bath. Of course, methods other than those described here are also conceivable.

A supplementary explanation of the human body detection (FIGS. 18 and 19) based on the rapid rise and fall of the water level will be given. The water level may be raised by water supply from a water faucet, hot water supply by automatic hot water filling by a water heater, etc. In these cases, the amount of water supply or hot water supply is generally 15 to 20 L / min.
And the rising gradient of the water level is about 50 to 70 mm / min. On the other hand, when a person takes a bath, it is instant (40-80m
The water level rises to about m / sec), and the bathing time of a person can be detected by using the rising time and the rising width of the water level as conditions.

Human body detection by a photoelectric sensor or the like (FIG. 20)
Is arranged so that the optical axis is directed to a position where a person takes a bath. When there is a bather, light such as infrared rays emitted from the light projecting unit shines on the bather, is reflected, and returns to the light receiving unit. When there is no bather, the light emitted from the light projecting unit does not hit the bather and is not reflected back to the light receiving unit. Thus, the presence or absence of a bather is determined. Of course, the projection axis direction, the sensitivity, and the like of the photoelectric sensor need to be carefully set so as not to erroneously detect the tub rim, wall, and the like of the bathroom. The photoelectric sensor may be a general infrared sensor or a distance measuring sensor to which triangulation or the like is applied.

In any case, the backwashing of the septic tank is prohibited while a person is taking a bath, thereby preventing the blow discharge from being interrupted and the water level from dropping.

Next, a second embodiment of the present invention will be described. FIG. 9 is a control block diagram according to the present embodiment,
FIG. 10 is an operation flowchart. In FIG. 9, the number of bathers detected by the bathing detecting means 32 is counted by the bathing person counting means 46. Then, the bathing frequency, that is, the average value of the number of bathers per day, and the like are calculated, and according to the result, the reverse cleaning mode stored in the reverse cleaning mode storage unit 31 according to a rule predetermined by the reverse cleaning mode selection unit 29. One of the most suitable back washing modes is selected from the washing modes, and the back washing is performed in the selected back washing mode. The bathing detecting means 32 is the same as the method shown in the first embodiment of the present invention.

A specific flow will be described with reference to FIG. When the operation switch 21 is turned on, the pump 1 is turned on.
Then, circulation of the bathtub water is started (S201), and the switching valve 9 is driven to the purification circulation position shown in FIG. 2 (S202). At this time, if the heat retention switch 20 shown in FIG. 4 is turned on, the heater 6 is ON / OFF controlled based on the set temperature signal set by the set temperature change switch 23 and the signal from the first thermistor 5, and the bathtub water is controlled. Is kept warm.

When the backwashing operation control means 28 determines that the backwashing start time has come (S203Y), the backwashing mode selection means 29 stores the data in the backwashing mode storage means 31 in accordance with the output from the bathing person counting means 46. One of the stored reverse cleaning modes, which is considered to be optimal, is selected (S204, S205), and the switching valve control means 27 moves the switching valve 9 to the reverse cleaning position shown in FIG. (S
206) In this state, the operation of the pump 1 is controlled at a rotation speed corresponding to the reverse cleaning mode to perform the reverse cleaning of the septic tank 3 (S207). Thereafter, when the backwashing for a predetermined time is completed (Y in S208), the switching valve 9 returns to the cleaning operation position (S2).
02), the bathtub water purification operation is started again.

Here, the reverse cleaning mode stored in the reverse cleaning mode storage means 31 will be described. As the reverse cleaning mode, a flow rate and a reverse cleaning time at the time of the reverse cleaning are determined corresponding to each of the modes 1 to n.

Next, a third embodiment of the present invention will be described. FIG. 12 is a control block diagram in the present embodiment, and FIG. 13 is an operation flowchart. In FIG. 12, when the bathing detecting means 32 detects the bathing of a person, the pump rotation speed setting means 28 sets the rotation speed of the pump to a rotation speed (R2) different from the rotation speed (R1) during the bathtub water purification operation. Switch to

A specific flow will be described with reference to FIG. When the operation switch 21 is turned on, the pump 1 is turned on.
Then, circulation of bath water is started (S301).
If the bathing detection unit 32 detects that the user is taking a bath (S302Y), the bathing flag is turned ON, and the pump control unit 26 controls the pump rotation speed to be R2 (S303, 304).

If it is determined that the bathing is not taking place during the circulation of the bathtub water (N in S302), if the bathing flag is OFF (S305-OFF), the bathing is stopped immediately after the bathing of the person is no longer detected. Control is performed so as to be the number (R1). However, when the bathing flag is ON (S305)
-ON), in this case, the bathing flag is turned off to confirm that the bather is gone (S306), and the timer T3 waits for a predetermined time set in T3 to elapse (S307, S308) The pump speed is controlled to be R1 (S309).

In many cases, the noise generated by the bathtub water purification device is the vibration of the pump 1 for circulating the bathtub water. In addition, a pumping sound generated in the bathtub water circulation path is also generated because the pump 1 circulates the bathtub water. If the bather feels uncomfortable with these noises, the rotation speed (R2) lower than the rotation speed (R1) of the pump, that is, R1> R2, while the bathing of the person is detected is detected. Pump 1
The vibration energy of the bathtub water circulator can be reduced to reduce the noise and water flow noise generated from the functional unit 17 of the bathtub water circulation device. However, while the pump rotation speed is (R2), the amount of bathtub water flowing to the purification tank 3 decreases, which results in a reduction in purification performance. Therefore, the pump rotation speed cannot always be reduced. Therefore, when the bather is no longer detected, it is necessary to return the pump rotation speed to the original (R1).

Next, a fourth embodiment of the present invention will be described. FIG. 14 is a block diagram of this embodiment, and FIGS. 15, 16, and 17 are operation flowcharts. In FIG. 14, the bathing of a person detected by the bathing detecting means 32 is transmitted to the bathing time estimating means 48 as a set of bathing number information by the bathing number measuring means 46 and bathing time information by the bathing time storage means 47. The bathing status at the site is confirmed. Then, the time when the bathtub water needs to be kept at a predetermined temperature is estimated and determined based on the bathing state, and the bathtub water b is started to be heated so that the bathtub water temperature is heated to the set temperature at that time. The time to perform is determined by the boiling start time determining means 49.

Here, the 24-hour timer 50 serving as a reference for storing the bathing time does not need to store an absolute time (eg, 12:15) like a clock, for example. Arbitrary time is set based on time (whatever hour and minute), and its relative time (reference time + 0 to 2)
4 hours). Of course, the absolute time such as a clock may be stored.

An example of the procedure for estimating the bathing time and determining the time to start boiling will be described with reference to FIG. FIG.
In 1, the bathing time storage means 47 stores the times (t1 to t4) when the bathing detecting means 32 detects that the bathers (A, B, C) took a bath. Here, in FIG. 21, the bathing detection time of one day (24 hours) is stored for simplicity, but actually, for example, the bathing detection time of the past week is stored. Next, the time before the time T1 and after the time T2 with respect to the stored time (t1 to t4) is estimated as the bathing time at the use site. Here, the times T1 and T2 are predetermined times such as 30 minutes and 1 hour. Here, the time (tn−T1) to (tn)
During + T2), boiling is started at time T3 before time (tn-T1), that is, at time (tn-T1-T3) such that the bathtub water temperature becomes the temperature set by the bathtub water temperature setting means 36. I do.

A specific flow will be described with reference to FIG. When the operation switch 21 is turned on, the power supply to the heater 6 is turned off (S401), and it is determined whether or not the boiling start time ((tn-T1-T3) described above) has been reached. (S402)
Y) The bath water temperature detected by the bath water temperature detecting means 5 is compared with the set temperature set by the bath water setting means 35 by the temperature comparing means 36. If the bath water temperature is not equal to or more than the set temperature (S403N), Electricity is supplied to the heater 6 by the bathtub water heating means control means 37 to boil the bathtub water (S40).
4).

After the bathtub water temperature reaches the set temperature (S403Y), the bathtub water temperature is set to the bathtub water set temperature by the bathtub water heating means control means 37 in the time zone set by the heat retention time timer T. O of heater 6
N / OFF is controlled to keep the bathtub water warm (S405-S
409). Here, the time set by the heat retention time timer T is the time from the end of boiling to the above-mentioned (tn + T2).

Another operation flow will be described with reference to FIG. In this flow, when a transition is made to the heat retention state after the completion of boiling in S403, if the bather is once detected and then becomes non-detection, the heat retention operation is stopped after the time set by the timer T has elapsed. This is different from the flow shown in FIG.

That is, if a warming end flag described later is OFF (S410-OFF), it is determined whether or not the bath detecting means 32 detects a bather, and if a bather is detected (S411Y), the bather is detected. Turn on the detection flag. When the bather is not detected (S413Y), the bathing detection flag is turned off and the warming end flag is turned on (S413).
415, S416), start the heat retention time timer T, and during the predetermined time set by the heat retention time timer T,
The heat retention of the bath water is continued (S406 to S410).

When it is detected in S406 that the predetermined time set by the heat retention time timer T has elapsed (Y in S406), the heat retention end flag is turned OFF (S406).
417) to turn off the heater 6 (S401). Here, the predetermined time set in the warming time timer T is a fixed time of about 30 minutes different from the time of the warming time timer T in the flow of FIG. 15 described above, and therefore, the past time described in FIG. (T1 + T2 + T
It is possible to control the power supply to the heater 6 according to the actual use state, regardless of the power supply time period such as 3).

Another operation flow will be described with reference to FIG. In this flow, after the bather is detected once in S415, the bather is not detected and the bathing detection flag is turned off.
After that, it differs from the flow shown in FIG. 16 in that it is determined whether or not a predetermined number of bathers has been reached.

That is, in S415, the bathing detection flag is turned off.
After F, the bathing person counter is incremented (S41).
8) If the value of the bathing person counter exceeds a predetermined number of people (S419Y), the warming end flag is turned on and the bathing person counter is cleared (S420, S421), and thereafter, the warming time timer T is started to keep the warming time. The bathtub water is kept warm for a predetermined time set by the time timer T (S406 to S410). Here, the predetermined number of people to be compared with the number of bathing people counter in S419 is a value calculated from an average value of the number of bathing people per 24 hours detected in the past.

When it is detected that the predetermined time set by the heat retention time timer T has elapsed (S406).
Y), the heat retention end flag is turned off (S417), and the heater 6 is turned off (S401). Here, the predetermined time set in the warming time timer T is the same as that in FIG.
The time of the heat retention time timer T of the flow of FIG. 4 is also a fixed time of about 30 minutes, and therefore, the actual use time is not limited to the power supply time period (T1 + T2 + T3) calculated from the past use time period described in FIG. It is possible to control the energization of the heater 6 according to the state.

In step S419, the value (T1 + T2 + T) is calculated from the past use time period described with reference to FIG.
If the value of the bathing person counter does not exceed the predetermined number of people even after the time period 3), the power supply to the heater 6 is turned off.
It is desirable to perform FF so that daily fluctuations in the number of bathers can be dealt with.

Next, a fifth embodiment of the present invention will be described. In the above-described fourth embodiment of the present invention,
Although the control of the bathtub water heating means 6 according to the time zone calculated based on the output from the bathing detection means 32 has been described, in the fifth embodiment, the control target is the bathtub water heating means 6. Instead, the load of the pump 1 and the switching valve 9 is used to change the state of bathtub water circulation with respect to the septic tank 3.

For example, in the time zone of (T1 + T2 + T3) calculated from the past use time zone described with reference to FIG. 21, the rotation speed of the pump 1 is lower than the rotation speed (R1) in the bathtub water purification circulation operation. Number (R2), ie, R1> R2
By controlling the operating state of the pump so as to reduce the noise and water flow from the functional unit 17 of the bathtub water circulation device, the noise level is already set when the user enters the bathroom to take a bath. Can be kept low.

During the time period (T1 + T2 + T3) calculated from the past use time period described with reference to FIG. 21, the switching valve 9 is prohibited from being in the reverse cleaning position shown in FIG. Is fixed to the bath tub water circulation position shown in FIG.
Insufficient water level due to the backwashing of the tub and the discharge of bathtub water can be prevented.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a bathtub water purification device.

[Fig. 2] Water flow path during bath tub water purification operation

Fig. 3 Water passage during backwashing of a septic tank

FIG. 4 is a schematic diagram of an operation unit.

FIG. 5 is a control block diagram according to the first embodiment of the present invention.

FIG. 6 is an operation flowchart (1) of the first embodiment of the present invention.

FIG. 7 is an operation flowchart (2) of the first embodiment of the present invention.

FIG. 8 is an operation flowchart (3) of the first embodiment of the present invention.

FIG. 9 is a control block diagram according to a second embodiment of the present invention.

FIG. 10 is an operation flowchart of the second embodiment of the present invention.

FIG. 11 shows parameters of the reverse cleaning mode according to the second embodiment of the present invention.

FIG. 12 is a control block diagram according to a third embodiment of the present invention.

FIG. 13 is an operation flowchart of the third embodiment of the present invention.

FIG. 14 is a control block diagram according to a fourth embodiment of the present invention.

FIG. 15 is an operation flowchart (1) of the fourth embodiment of the present invention.

FIG. 16 is an operation flowchart (2) of the fourth embodiment of the present invention.

FIG. 17 is an operation flowchart (3) of the fourth embodiment of the present invention.

FIG. 18 is an image diagram of a change in water level when taking a bath.

FIG. 19 is a graph showing a change in water level when taking a bath.

FIG. 20: Bathing detection by photoelectric sensor

FIG. 21 is a diagram showing a concept of a time zone of a bather.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Pump 2 ... Water flow switch 3 ... Septic tank 4 ... Sterilizer 5 ... Bathtub water temperature detecting means (first thermistor) 6 ... Bathtub water heating means (heater) 7 ... Second thermistor 9 ... Switching valve 10 ... Drain port 15 ... Control unit 16 Bathtub 17 Function unit 18 Operation unit 20 Insulation switch 21 Operation switch 22 Setting temperature display 23 Setting temperature change switch 24 Number of bathers setting display 25 ... Number of bathers setting change switch 26 Pump Control means 27 ... Switching valve control means 28 ... Pump rotation speed setting means 29 ... Backwash mode selection means 30 ... Input number setting means 31 ... Backwash mode storage means 32 ... Bath detection means 33 ... Pump current detection means 34 ... Dirt Condition estimating means 35 Bath water temperature setting means 36 Temperature comparing means 37 Bath water heating means (heater) control means 44 Backwash operation prohibition judging means 4 ... backwash end judging means 46 ... bathing people counting means 47 ... bathing time storage means 48 ... bathing time estimating means 49 ... heating-up start time determining means 50 ... 24 hours time timer 51 ... bathing in switch 53 ... photoelectric sensor

Claims (15)

[Claims] 1. A pump for circulating bathtub water, a purification tank for filtering fine dirt and impurities from the bathtub water, and a switching valve for switching a bathtub water flow path in a predetermined direction. The bath water is purified by circulating in a forward direction with respect to the septic tank, the path of the switching valve is switched, and the bath water is discharged in the reverse direction with respect to the septic tank to discharge impurities adhered to the septic tank and to reversely clean the septic tank. The bath tub water purifying device is provided with bath detecting means for detecting the bathing of a person, while detecting the bathing of a person, or after detecting the bathing of a person once after detecting the bathing of a person. A bathtub water purification device wherein backwashing of a septic tank is prohibited for a predetermined time. 2. The bathtub water purification apparatus according to claim 1, wherein when backwashing of the septic tank is performed and a bathing of a person is detected, the backwash is terminated. 3. The bathtub water purifying apparatus according to claim 1, wherein when backwashing of the septic tank is performed, when the bathing of a person is detected, the backwashing is temporarily suspended, and the bathing of the person is no longer detected, and a predetermined time has elapsed. Then, the bathtub water purification apparatus is characterized in that the backwashing of the septic tank is restarted. 4. A bath for circulating bath water, a purifying tank for filtering fine dirt and impurities from the bath water, and a switching valve for switching a flow path of the bath water in a predetermined direction. The bath water is purified by circulating in a forward direction with respect to the septic tank, the path of the switching valve is switched, and the bath water is discharged in the reverse direction with respect to the septic tank to discharge impurities adhered to the septic tank and to reversely clean the septic tank. In the bathtub water purifying apparatus, a backwashing mode storage means for storing a plurality of backwashing modes, a backwashing mode selecting means for selecting one of the plurality of backwashing modes, A bath detecting means for detecting, and a bath number measuring means for counting the number of bathers detected by the bath detecting means within a predetermined time, based on an output from the bath number measuring means. A bathtub water purifier characterized by selecting one of the plurality of reverse washing modes. 5. A bath for circulating bath water, a septic tank for filtering fine dirt and contaminants from the bath water, and bath detecting means for detecting bathing of a person, wherein when bathing of a person is detected. A bathtub water purification device characterized by switching the number of revolutions of a pump. 6. The bathtub water purification apparatus according to claim 5, wherein the rotation speed of the pump is reduced when a bathing of a person is detected. 7. The bathtub water purification apparatus according to claim 5, wherein the rotation speed of the pump is increased when a bathing of a person is detected. 8. A pump for circulating bath water, bath water heating means for heating and maintaining the bath water, bath water temperature detecting means for detecting the temperature of bath water, and bath detecting means for detecting bathing of a person. A bath tub water purification apparatus, wherein the power supply to the heating means is controlled in accordance with a time zone calculated based on the output from the bathing detection means. 9. The bathtub water purifying apparatus according to claim 8, wherein the time period is a period from a predetermined time before a predetermined time to a predetermined time after a bathing time start time of one or more persons detected in the past. Bath water purifier characterized by the sum of 10. The bathtub water purifying apparatus according to claim 8, wherein the heating unit is energized so that the temperature of the bathtub water becomes a predetermined temperature during the time period. Purification device. 11. The bathtub water purification apparatus according to claim 8, wherein when a bather is detected during said time period, the power supply to said heating means is performed based on the detection of a bather being no longer detected. Bath water purifier characterized by stopping. 12. The bathtub water purification apparatus according to claim 8, wherein when the number of bathers reaches a predetermined number during the time period, the bathing means does not detect the bathing of the person, and then the heating means is turned on. A bath tub water purification device, characterized in that the power supply to the bath is stopped. 13. The bathtub water purification apparatus according to claim 12, wherein said predetermined number of persons is calculated based on the number of bathers per day. 14. The bathtub water purification apparatus according to claim 12, wherein the power supply to said heating means is stopped in accordance with said time zone even if said predetermined number of persons is not reached. 15. A septic tank for filtering fine dirt and dirt impurities from bathtub water, a load such as a pump for changing a bathtub water circulation state to the septic tank, and bathing detecting means for detecting bathing of a person, A bathtub water purification device, wherein the operation state of the load is changed according to a time zone calculated based on an output from the bathing detection means.