JP2002322691A - System for reusing bathwater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system for reusing bathwater capable of supplying purified water to a toilet, a washing machine or the like at all times without causing freezing and clogging of pumps. SOLUTION: The system for reusing bathwater includes a water tank for retaining bathwater, a supply device for supplying water in the water tank, a supply means for supplying water in the water tank to the supply device, and a jet pump in a branch pipe branching from a discharge pipe leading to the supply device of the supply means. A suction pipe for sucking the bathwater is connected to the negative pressure part of the jet pump and the bathwater discharge pipe communicates with the water tank from the jet pump. The water- feeding operation of the system is carried out by which the bathwater is fed into the water tank by driving the supply means. A precipitator and filter capable of accommodating a filter is provided on the bathwater intake side of the water tank.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bathtub water recycling system for storing bathtub water in a water storage tank, and effectively using the water for daily use such as toilet flushing water and saving water.

[0002]

2. Description of the Related Art Conventionally, bath water or rain water is stored in a water storage tank,
Water is sent to a toilet or a washing machine by a pump or gravity and used as domestic water. For example, utility model registration 5
No. 687560 discloses a method in which bathtub water is guided to a water storage tank, and when necessary, is pumped to a toilet.

[0003]

However, in the contents described in Japanese Utility Model Registration No. 5687560, dirt and foreign matter in the piping may be mixed into the water storage tank, or the bath water may be left in the water storage tank for a long time. If the stored water becomes dirty, there is a problem that turbid water is supplied to a toilet or a washing machine. Further, there is a problem such as clogging of the pump due to foreign matter of turbid water.
Further, when used in a cold region, there is a problem that water in a water storage tank freezes and a toilet or the like cannot be used.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a bathtub water reuse system capable of supplying clean water which is always purified without freezing or clogging of a pump to a toilet or a washing machine. is there.

[0005]

Means for Solving the Problems and Action / Effect The invention according to the first aspect of the present invention has been made to solve the above problems, and a water tank for storing bath water, and a supply destination using water in the water tank. A supply means for supplying to the apparatus, a jet pump provided in a branch pipe branched from a discharge pipe of the supply means to the supply destination apparatus, and a bathtub water connected to a negative pressure portion of the jet pump. A bathtub water reuse system having a suction pipe and a bathtub water discharge pipe communicating from the jet pump to the water tank, driving the supply means, and performing a water supply operation of feeding bath water to the water tank. A sedimentation filtration tank capable of storing a filtering material is provided on the bathtub water suction port side of the water storage tank.

[0006] Normally, pipes through which domestic wastewater such as bathtub water flows are liable to be stained due to propagation of bacteria and adhesion of a small amount of dirt components in the bathtub water. For this reason, bacteria-derived foreign matter and the like may peel off and flow out of the piping through which domestic wastewater such as bathtub water flows. According to the present invention, since the sedimentation filtration tank is provided on the bath tub water suction side of the water storage tank, the pipe from the bath tub to the water storage tank is dirty, and even if foreign matter flows out, it is not mixed into the water storage tank, Water with stable water quality can be supplied to toilets and the like. Further, since the stored water is purified in the sedimentation filtration tank, clogging of the pump is prevented.

According to a second aspect of the present invention, an electric valve is provided in the suction pipe, and the supply means is driven in a state in which the electric valve is closed to shut off the inflow of bathtub water so that the stored water is stored in the water tank and the water tank. It is characterized by being circulated between the supply means.

According to the present invention, the water in the water storage tank can be circulated while passing through the sedimentation filtration tank. Therefore, even if the water in the water storage tank becomes dirty due to long-term storage, the water can be purified. And clean water can always be supplied to the supply destination device.

The invention according to claim 3 is a water tank for storing bath water, a supply means for supplying water to a supply destination device utilizing water in the water tank, and a supply means from the water tank. A suction pipe that merges with the water supply pipe to draw in the bathtub water, a switching means that switches the inflow of bathtub water and stored water to the supply means, and a discharge pipe that branches from the supply means to the supply destination device. A branch pipe communicating with the water storage tank, an electric valve provided in the branch pipe,
In the bath tub water reuse system, wherein the electric valve is in an open state, the switching means is driven with the bath tub water inflowing side to drive the supply means, and a water supply operation for supplying bath tub water to the water storage tank is performed. A sedimentation filtration tank capable of storing a filtering material is provided on the bath water inlet side of the water storage tank.

According to the present invention, as in the case of the first aspect, even if the pipe from the bathtub to the water storage tank is contaminated and foreign matter flows out, it is not mixed into the water storage tank and the water of stable water quality is obtained. Can be supplied to a toilet or the like. Further, since the stored water is purified in the sedimentation filtration tank, clogging of the pump is prevented.

According to a fourth aspect of the present invention, when the electric valve is open, the switching means is switched to a side where the stored water flows in, and the supply means is driven in a state where the inflow of the bathtub water is shut off, thereby storing the stored water. Is circulated between the water storage tank and the supply means.

According to the present invention, the water in the water storage tank can be circulated while passing through the sedimentation filtration tank in the same manner as the effect of claim 2, so that the water in the water storage tank is left for a long time. As a result, even if it becomes dirty, it can be purified and clean water can always be supplied to the supply destination device.

According to a fifth aspect of the present invention, an atmosphere temperature measuring device is provided, and when the atmosphere temperature falls below a set value,
An antifreeze operation is performed in which the supply means is driven to circulate stored water between the water storage tank and the supply means.

A water tank for storing bath water or the like can be usually installed outdoors. For this reason, it is conceivable that the stored water inside the water storage tank freezes in winter. According to the present invention, the stored water is circulated between the water storage tank and the supply means when the ambient temperature becomes equal to or lower than the set value, so that the stored water is stirred and freezing can be prevented.

The invention according to claim 6 is characterized in that when the ambient temperature is equal to or lower than the set value, the antifreeze operation is performed for a first predetermined time, and thereafter the antifreeze operation is stopped for a second predetermined time.

Even if the stored water is not constantly stirred, it can be prevented from freezing if it is stirred within a minimum necessary range. According to the present invention, the anti-freezing operation can be performed at predetermined time intervals, so that the stored water can be prevented from freezing without waste of power consumption.

Further, the invention according to claim 7 is characterized in that the second predetermined time is varied according to the ambient temperature.

The speed at which water freezes is affected by the ambient temperature. Therefore, as in the present invention, by changing the time interval for circulating and stirring the stored water according to the ambient temperature, freezing of the stored water can be prevented without waste of power consumption.

Further, the invention according to claim 8 is characterized in that at the time of bathtub water supply, the electric valve is opened, the switching means is switched to the stored water inflow side, and then the switching means is switched to the bathtub water inflow side. I do.

When the bathtub water is sent to the water storage tank, the bathtub water runs out, and air may be trapped in the piping from the bathtub to the pump and in the pump. In this case, the next time the bathtub water is pumped to the water storage tank, the pump is filled with air, and the piping from the bathtub to the pump is filled with air. is there. According to the present invention, the switching means is switched to a stored water inflow side,
After the stored water is drawn into the pump as priming water, the switching means is switched to the bathtub water inflow side.
Bathtub water can be smoothly fed to the water tank.

The ninth aspect of the present invention is characterized in that a filter medium containing a bactericidal metal compound such as silver, copper or zinc is eluted in the precipitation filtration tank.

According to the present invention, by selecting the amount and material of the purifying material, it is possible to stably add bactericidal metal ions to water at low cost. In addition, by dissolving the germicidal metal ions into water, it is possible to prevent the growth of bacteria in the water storage tank.

The invention according to claim 10 is characterized in that electrolytic means for eluting germicidal metal ions is provided in a circulation path between the water storage tank and the supply means.

According to the present invention, since the germicidal metal ions are eluted by electrolysis, the amount of the germicidal metal ions eluted can be controlled by controlling the current or voltage so that the germicidal metal ions can be efficiently and efficiently removed from water. Can be eluted. This can also prevent the growth of bacteria in the water storage tank.

The invention according to claim 11 is characterized in that a timer is provided and the water supply of the bathtub water is automatically stopped after a predetermined time from the start of the water supply of the bathtub water.

According to the present invention, even if the user forgets to stop the water supply of the bathtub, the water supply of the bathtub water is automatically stopped, so that there is no waste in power consumption and the water supply of the bathtub water can be supplied to the water storage tank. it can.

Further, the invention according to claim 12 is characterized in that a water level sensor for detecting the remaining amount of bathtub water is provided, and when the remaining water amount falls below a predetermined water amount, the water supply of the bathtub water is automatically stopped.

According to the present invention, as in the case of the eleventh aspect, even if the user forgets to stop the bathtub water supply, the bathtub water supply is automatically stopped, so that there is no waste in power consumption. The tub water can be sent to the water tank.

In the thirteenth aspect of the present invention, the water supply operation for supplying bathtub water to the water storage tank has priority over the antifreeze operation, and the bathtub water reuse system according to any one of claims 5 to 7 is provided. .

According to the present invention, even when the anti-freezing operation is performed, the water can be supplied when the user wants to supply the bath water to the water storage tank, so that the usability is good.

[0031]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a configuration diagram showing a first embodiment of the present invention. 1 is a water storage tank, 2 is a sedimentation filtration tank, 3 is a pump whose operation is controlled by a pressure switch 18, 4 is a bathtub, 5 is a toilet bowl, 5a is a water storage tank of a toilet bowl, 6
Is a jet pump, 7 and 8 are a first electric valve, a second electric valve which opens and closes in conjunction with a switch 19 or a control unit 20, 9 is a thermistor for measuring an ambient temperature, and 10 is a water level sensor for detecting a residual water amount in a bathtub. It is. Reference numeral 11 denotes a discharge pipe provided on the discharge side of the pump 3;
Numeral 12 is a branch pipe, 13 is a suction pipe communicating with the bathtub 4, and 14 is a bathtub water discharge pipe connected to the discharge side of the jet pump 6. FIG. 2 is an enlarged view of the jet pump according to the first embodiment of the present invention. As shown in the figure, the T-shaped jet pump 6 is connected to the branch pipe 1.
It comprises a jet nozzle 15 connected to two sides and a venturi tube 16 facing the jet nozzle. The negative pressure port 17 located on the side of the jet pump 6
Is connected to a suction pipe 13 communicating with the bathtub 4. A bath water discharge pipe 14 is connected to the discharge side of the jet pump.

Next, the operation of the bathtub water reuse system of the present invention will be described. The operation at the time of bathtub water recovery in the first embodiment of the present invention will be described with reference to FIG. The thick line indicates the flow of water at the time of bathtub water recovery. When the bathtub water in the bathtub 4 is collected in the water storage tank 1, when the switch 19 is turned on, the first electric valve 7 and the second electric valve 8 are opened, the pressure in the branch pipe 12 drops, and the pressure switch 18 is turned on. When this is detected, the pump 3 is driven. When the pump 3 is driven, the water stored in the water storage tank 1 is circulated through the pump 3, the first electric valve 7, the jet pump 6, and the water storage tank 1. In the jet pump 6, a negative pressure is generated on the side of the jet nozzle 15, and this negative pressure generates a suction force in the suction pipe 13, and bathtub water in the bathtub 4 is sucked into the suction pipe 13. The water is collected in the water storage tank 1 through the water discharge pipe 14. Further, the bath water is filtered when passing through the sedimentation filtration tank 2 in the water storage tank 1, and the bactericidal metal ions are dissolved from the filter medium, and the bath water stored in the water storage tank is sterilized. When the bathtub water in the bathtub 4 has been collected, when the switch 19 is turned off, the first electric valve 7 and the second electric valve 8 are closed, and the discharge pipe 1
1 rises, the pressure switch 18 detects this, and the pump 3 stops. The control of the stop of the bathtub water collection is performed by the control unit 20.
After a predetermined time, the first electric valve 7 and the second electric valve 8
Can be stopped automatically, or the first electric valve 7 and the second electric valve 8 can be closed when the remaining water level in the bathtub 4 is detected by the water level sensor 10 and becomes lower than a predetermined value. Then, it can be automatically stopped.

Next, the operation of the first embodiment of the present invention when water is supplied from the toilet will be described with reference to FIG. The bold line shows the flow of water during toilet water supply. When supplying the stored water in the water storage tank 1 to the toilet 5 as the supply destination, when the toilet 5 as the supply destination is used and the washing water in the water storage tank 5a of the toilet 5 runs out,
The pressure in the discharge pipe 11 decreases, the pressure switch 18 detects the decrease in pressure, and the pump 3 is automatically driven, and the water stored in the water storage tank 1 is supplied to the water storage tank 5 a of the toilet 5. When the water level in the water storage tank 5a of the toilet 5 reaches a predetermined position, a ball tap (not shown) in the water storage tank 5a closes and the pressure in the discharge pipe 11 rises. Automatically stops, and the supply of the stored water to the water storage tank 5a of the toilet stops.

Next, a description will be given of an antifreezing operation in the first embodiment of the present invention with reference to FIG. The bold line indicates the flow of water during the antifreeze operation. When the thermistor 9 detects that the ambient temperature is equal to or lower than a predetermined value, the first electric valve 7 opens, the pressure of the discharge pipe 11 decreases, the pressure switch 18 detects the decrease in pressure, and the pump 3 automatically drives. The stored water in the water storage tank 1 circulates in the order of the pump 3, the first electric valve 7, the jet pump 6, and the water storage tank 1. After a predetermined time, the first electric valve 7 closes, the pressure in the discharge pipe 11 increases,
When the pressure switch 18 detects an increase in pressure, the pump 3 stops. When the ambient temperature is equal to or lower than the predetermined value after a predetermined time after the pump 3 stops, the above operation is repeatedly performed. By this series of operations, the water stored in the water tank 1 and the pipe is stirred,
Freezing is prevented. Further, by changing the stop time of the pump 3 depending on the ambient temperature, it is possible to perform an antifreeze operation without waste in power consumption.

Next, a purification operation in the water storage tank will be described. The purifying operation means that the first electric valve 7 is periodically operated by the control unit 20 even when the ambient temperature is not lower than the predetermined value, and the above-described antifreeze operation is performed. At this time, the stored water in the water storage tank 1 circulates through the pump 3, the first electric valve 7, the jet pump 6, and the sedimentation filtration tank 2. Here, the stored water is filtered by the sedimentation filtration tank 2, and the germicidal metal ions are eluted by using a filter medium containing a germicidal metal compound, and the stored water is constantly purified and maintained at a constant water quality that is sterilized. be able to.

FIG. 6 is a block diagram showing a second embodiment of the present invention. 1 is a water storage tank, 2 is a sedimentation filtration tank, 3 is a pump whose operation is controlled by a pressure switch 18, 4 is a bathtub, 5 is a toilet bowl, 5a is a water storage tank 7, 8, and 50 of a toilet bowl with a switch 19 or a control unit 20. A first electric valve, a second electric valve, and a third electric valve that open and close in conjunction with each other, 9 is a thermistor that measures the ambient temperature, and 10 is a water level sensor that detects the amount of remaining water in the bathtub. Reference numeral 11 denotes a discharge pipe provided on the discharge side of the pump 3;
2 is a branch pipe, and 13 is a suction pipe communicating with the bathtub 4.

The operation of the second embodiment of the present invention at the time of bathtub water recovery will be described with reference to FIG. The thick line indicates the flow of water at the time of bathtub water recovery. When the bathtub water in the bathtub 4 is collected in the water storage tank 1, when the switch 19 is turned on, the first electric valve 7 and the third electric valve 50 are opened, the pressure in the branch pipe 12 drops, and the pressure switch 18 is turned on. When this is detected, the pump 3
Drives. When the pump 3 is driven, the water stored in the water storage tank 1 is supplied to the third electric valve 50, the pump 3, the first electric valve 7,
Circulated through the water storage tank 1. Thereafter, by opening the second electric valve and closing the third electric valve, the circulation of the stored water is stopped, and the bathtub water is collected in the water storage tank via the second electric valve, the pump, and the first electric valve. By this operation, the stored water in the water storage tank 1 is drawn into the pump 3 as priming water. Therefore, when the bath water is exhausted at the time of the previous bath water recovery and air is sucked into the suction pipe 13 and the pump 3, the pump air It is possible to solve the problem that the air in the suction pipe 13 does not escape well due to the biting and the bathtub water is not supplied well. Further, the bath water is filtered when passing through the sedimentation filtration tank 2 in the water storage tank 1, and the bactericidal metal ions are dissolved from the filter medium, and the bath water stored in the water storage tank is sterilized. When the bathtub water in bathtub 4 is collected, switch 19 is turned off.
Then, the first electric valve 7 and the second electric valve 8 are closed, the pressure in the discharge pipe 11 increases, and the pressure switch 18 detects this, and the pump 3 stops. The stop of the bathtub water collection can be automatically stopped by closing the first electric valve 7 and the second electric valve 8 after a predetermined time by the control unit 20, or the remaining water level in the bathtub 4 can be detected by the water level sensor 10. Then, when the remaining water amount becomes equal to or less than a predetermined value, the first electric valve 7 and the second electric valve 8 can be closed and automatically stopped.

Next, the operation of the second embodiment of the present invention at the time of toilet water supply will be described with reference to FIG. The bold line shows the flow of water during toilet water supply. Water tank 1 to toilet 5 which is the supply destination
When the stored water in the toilet is supplied, when the toilet 5 as the supply destination is used and the washing water in the water storage tank 5a of the toilet 5 runs out, the pressure of the discharge pipe 11 decreases, and the pressure switch 18 controls the decrease of the pressure. Upon detection, the pump 3 is automatically driven, and the water stored in the water storage tank 1 is supplied to the water storage tank 5 a of the toilet 5.
When the water level in the water storage tank 5a of the toilet 5 reaches a predetermined position, a ball tap (not shown) in the water storage tank 5a closes and the pressure in the discharge pipe 11 rises. Automatically stops and the toilet water tank 5
The supply of stored water to a stops.

Next, a description will be given of an antifreezing operation in a second embodiment of the present invention with reference to FIG. The thick line indicates the flow of water during the antifreeze operation. When the thermistor 9 detects that the ambient temperature is equal to or lower than a predetermined value, the first electric valve 7 and the third electric valve 50 open, the pressure of the discharge pipe 11 decreases, and the pressure switch 18 detects the decrease in pressure, and the pump 3
Is automatically driven, and the water stored in the water storage tank 1 circulates in the order of the third electric valve 50, the pump 3, the first electric valve 7, and the water storage tank 1. After a predetermined time, the first electric valve 7 closes, the pressure in the discharge pipe 11 increases, and the pressure switch 18 detects the increase in pressure, and the pump 3 stops. When the ambient temperature is equal to or lower than the predetermined value after a predetermined time after the pump 3 is stopped, the above operation is repeatedly performed. By this series of operations, the water stored in the water storage tank 1 and the piping is stirred, and freezing is prevented. In addition, by making the stop time of the pump 3 variable according to the ambient temperature, it is possible to perform an antifreeze operation without wasting power.

Next, a purification operation in the water storage tank will be described. The purifying operation means that the first electric valve 7 and the third electric valve 50 are periodically operated by the control unit 20 even when the ambient temperature is not lower than the predetermined value, and the above-mentioned antifreeze operation is performed. At this time, the water stored in the water storage tank 1 is supplied to the third electric valve 50, the pump 3, the first electric valve 7, the sedimentation filtration tank 2
Circulates through. Here, the stored water is filtered by the sedimentation filtration tank 2, and the germicidal metal ions are eluted by using a filter medium containing a germicidal metal compound, and the stored water is constantly purified and maintained at a constant water quality that is sterilized. be able to.

[0041]

According to the present invention, it is possible to provide a bathtub water recycling system capable of supplying clean water constantly sterilized and purified to a toilet or a washing machine without freezing or clogging of a pump.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention.

FIG. 2 is an enlarged view of a jet pump according to the first embodiment of the present invention.

FIG. 3 is a view showing a flow of water at the time of bathtub water recovery in the first embodiment of the present invention.

FIG. 4 is a diagram showing a flow of water during toilet water supply according to the first embodiment of the present invention.

FIG. 5 is a diagram showing a flow of water during an antifreezing operation in the first embodiment of the present invention.

FIG. 6 is a configuration diagram showing a second embodiment of the present invention.

FIG. 7 is a diagram showing a flow of water when bathtub water is recovered in a second embodiment of the present invention.

FIG. 8 is a diagram showing a flow of water during toilet water supply in a second embodiment of the present invention.

FIG. 9 is a diagram showing a flow of water during an antifreezing operation in a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Water storage tank 2 ... Sedimentation filtration tank 3 ... Pump 4 ... Bathtub 5 ... Toilet 5a ... Toilet water storage tank 6 ... Jet pump 7 ... First electric valve 8 ... Second electric valve 9 ... Thermistor 10 ... Water level sensor 11 ... Discharge Pipe 12 ... Branch pipe 13 ... Suction pipe 14 ... Bath water discharge pipe 15 ... Jet nozzle 16 ... Venturi pipe 17 ... Negative pressure port 18 ... Pressure switch 19 ... Switch 20 ... Control unit 50 ... Third electric valve

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masahiro Tsuneda 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu-shi, Fukuoka Prefecture Totoki Equipment Co., Ltd. (72) Inventor Shinra Endo Nakajima, Kitakyushu-shi, Fukuoka Prefecture 2-1-1, Totoki Equipment Co., Ltd. (72) Inventor Shigeru Ando 2-1-1, Nakajima, Kokurakita-ku, Kitakyushu-shi, Fukuoka Prefecture Totoki Equipment Co., Ltd. (72) Inventor Nobuhiko Kanekuni Kitakyushu, Fukuoka Prefecture 2-1-1 Nakajima, Nakajima, Kokurakita-ku, Tokyo Tohki Equipment Co., Ltd. (72) Inventor Hidemi Hiromoto 2-1-1, Nakajima, Kokurakita-ku, Kitakyushu-shi, Fukuoka F-term (reference) 2D039 DA01 2D060 AA03 AA07 AB10

Claims (13)

[Claims] 1. A water tank for storing bath water and rainwater, supply means for supplying water to a supply device using water in the water tank, and a discharge pipe of the supply means to the supply device. A jet pump provided in the branched pipe, a suction pipe connected to a negative pressure part of the jet pump for sucking bath water, and a bath water discharge pipe communicating from the jet pump to the water storage tank. A bath tub water reuse system that performs a water supply operation of driving the supply unit and supplying bath tub water to the water storage tank, wherein a sedimentation filtration tank capable of storing a filter material is provided on the bath water suction side of the water storage tank. Bath water reuse system characterized by the above-mentioned. 2. The bath tub water recycling system according to claim 1, wherein a water stopping means is provided in said suction pipe, and said supply means is driven in a state in which said water stopping means is closed to shut off inflow of bath tub water. And circulating stored water between the water storage tank and the supply means. 3. A water tank for storing bathtub water, supply means for supplying water to a supply destination device using water in the water tank, and a water pipe connected from the water tank to the supply means. A suction pipe for sucking bathtub water, a switching means for switching the inflow of bathtub water and stored water to the supply means, and a branch for branching from a discharge pipe from the supply means to the supply destination device and communicating with the water storage tank A pipe, and a water stopping means provided in the branch pipe; and when the water stopping means is in an open state, the switching means is driven with the bathtub water flowing side to drive the supply means, and the bathtub water is stored in the water storage means. A bathtub water reuse system for performing a water supply operation for feeding water to a tank, wherein a settling filter tank capable of storing a filter material is provided on the bathtub water suction port side of the water storage tank. 4. The bath tub water recycling system according to claim 3, wherein said switching means is switched to a side where stored water flows in when said water stopping means is in an open state, and said supply is performed in a state where inflow of bath water is shut off. A bathtub water reuse system, characterized in that the means is driven to circulate stored water between the water tank and the supply means. 5. The bath tub water recycling system according to claim 2, further comprising an atmosphere temperature measuring device, wherein when the ambient temperature becomes equal to or lower than a set value, the supply means is driven to store the stored water. A bath tub water reuse system, wherein an anti-freezing operation of circulating between the water tank and the supply means is performed. 6. The bathtub water reuse system according to claim 5, wherein when the ambient temperature is equal to or lower than a set value, the antifreeze operation is performed for a first predetermined time, and thereafter, the antifreeze operation is stopped for a second predetermined time. Bath water reuse system characterized by the following. 7. The bathtub water reuse system according to claim 6, wherein said second predetermined time is varied according to an ambient temperature. 8. The bathtub water recycling system according to claim 3, wherein the water stopping means is opened when the bathtub water is supplied, and the switching means is switched to a side into which the stored water flows, and then the switching means is switched to the bathtub. A bathtub water reuse system characterized by switching to a side where water flows in. 9. The bath tub water reuse system according to any one of claims 1 to 8, wherein a filter medium containing a bactericidal metal compound such as silver, copper, or zinc is eluted in the settling filter tank. And bathtub water reuse system. 10. The bath water reuse system according to claim 1, further comprising an electrolytic means for eluting germicidal metal ions in a circulation path between the water storage tank and the supply means. And bathtub water reuse system. 11. The bathtub water reuse system according to claim 1, wherein a timer is provided, and water supply of the bathtub water is automatically stopped a predetermined time after water supply of the bathtub is started. Bath tub water reuse system. 12. The bathtub water recycling system according to claim 1, further comprising a water level sensor for detecting a remaining amount of the bathtub water, and automatically stopping the water supply of the bathtub water when the remaining water amount is equal to or less than a predetermined water amount. Bath water reuse system characterized by the following. 13. The bathtub water recycling system according to claim 5, wherein a water supply operation for supplying bathtub water to the water storage tank has priority over an antifreeze operation. Usage system.