JP2015010337A - Bathtub water utilization device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bathtub water utilization device capable of washing the inside of a pipeline for transferring bathtub water form a bathtub to a tank and keeping the inside clean.SOLUTION: A bathtub water utilization device 10 pumps up hot water in a bathtub 2 to a tank 12 by a pump 11 through a recycled water supply pipe 21 connecting the bathtub 2 with the tank 12, and reuses the hot water stored in the tank 12 as wash water for a toilet. When washing the recycled water supply pipe 21, the device waits until a stopper of the bathtub 2 is pulled out and a bathtub water level is lowered rapidly, opens a solenoid valve 80A with a backflow prevention function and a clean water delivery pipe opening/closing solenoid valve 93 during rapid lowering of the bathtub water level, and washes a pipeline by making clean water from a clean water supply pipe 23 flow back to the recycled water supply pipe 21. Water after the washing of the pipeline is discharged from an exhaust port of the bathtub 2 with stopper pulled out to the outside of the bathtub.

Description

  The present invention relates to a bathtub water use device that uses bathtub water as flush water for toilet toilets.

  There is a household water reuse device that pumps the remaining hot water from a bathtub into a tank provided in a ceiling portion of a bathroom and uses it for washing water in a toilet (see Patent Document 1). In this household water reuse apparatus, an auxiliary tank is provided below the bathtub, the water in the bathtub is drawn into the auxiliary tank, and the water accumulated in the auxiliary tank is pumped to a tank provided in the bathroom ceiling.

Japanese Patent Laid-Open No. 10-60961

  When the remaining hot water after bathing is transferred to a tank installed in the ceiling of the bathroom and stored for reuse, the piping for transferring the bathtub water from the bathtub to the tank will not contain germs. It becomes dirty by breeding.

  The present invention is intended to solve the above-described problem, and an object of the present invention is to provide a bathtub water utilization device that can clean and keep clean the piping for transferring bathtub water from the bathtub to the tank. It is said.

  The gist of the present invention for achieving the object lies in the inventions of the following items.

[1] a tank;
A medium water supply pipe connecting between the tank and the water intake of the bathtub;
A pump for pumping water in the bathtub to the tank through the intermediate water supply pipe;
A solenoid valve with a backflow prevention function in which a water supply pipe is connected to the forward entry side;
One end is connected to the outlet side of the solenoid valve with the backflow prevention function, and the other end is joined to the vicinity of the tank side end of the middle water replenishment pipe,
An electromagnetic valve that opens and closes the intermediate water supply pipe between a confluence of the water supply pipe and the end on the tank side of the intermediate water supply pipe;
A drainage section for draining hot water in the tank to a predetermined outlet according to a request for reuse of hot water in the tank;
When the hot water in the bathtub is pumped into the tank, the solenoid valve with a backflow prevention function is closed, and the solenoid valve is opened to operate the pump, and when cleaning the intermediate water supply pipe, the solenoid valve is A control unit that controls to open the electromagnetic valve with a backflow prevention function in a closed state and to flow clean water from the water supply pipe into the bathtub;
A bath water utilization device characterized by comprising:

  In the above invention, hot water in the bathtub is pumped up to the tank through a medium water supply pipe connecting the bathtub and the tank, and the hot water stored in the tank is drained to a predetermined outlet according to a reuse request and reused. To do. When pumping hot water in the bathtub to the tank, close the solenoid valve with backflow prevention function and open the solenoid valve of the intermediate water supply pipe to connect the intermediate water supply pipe to the tank and operate the pump. When cleaning the intermediate water supply pipe, open the electromagnetic valve with backflow prevention function with the electromagnetic valve of the intermediate water supply pipe closed and drain the water from the water supply pipe into the intermediate water supply pipe and drain it into the bathtub. .

[2] The bathtub water utilization device according to [1], wherein the middle water supply pipe opens into the tank at a position higher than the highest water level of the tank.

  In the above invention, the outlet of the intermediate water supply pipe and the water in the tank are cut off by the height difference (space). Therefore, the water in the tank does not flow backward through the middle water drain pipe and flow into the bathtub.

[3] The bathtub water utilization device according to [1], wherein the solenoid valve is a second solenoid valve with a backflow prevention function in which a forward outlet side is the tank side.

  In the above invention, since the end of the intermediate water supply pipe is opened to the tank via the second solenoid valve with a backflow prevention function, there is no need to cut the edge with a height difference, and the intermediate water supply pipe is opened at the bottom of the tank, etc. Can be made.

[4] A water supply pipe that branches from the water supply pipe on the entry side of the solenoid valve with a backflow prevention function and that is open into the tank at a position higher than the highest water level of the tank;
A second solenoid valve for opening and closing the water supply pipe;
The bath water utilization device according to any one of [1] to [3], comprising:

  In the above invention, the tank can be replenished with clean water through the clean water supply pipe by opening the second electromagnetic valve. The terminal end of the water supply pipe is cut off from the water in the tank by the height difference.

[5] A water supply pipe branched from the water supply pipe and leading to the tank;
A third solenoid valve that opens and closes the water supply pipe between the branch point of the water supply pipe and the junction;
The control unit closes the third electromagnetic valve when pumping the water in the bathtub into the tank with the pump, opens the electromagnetic valve, and supplies water to the tank when the water is supplied to the tank. Any one of [1] to [3], wherein the third solenoid valve is closed and the third solenoid valve is opened and the solenoid valve is closed when the middle water supply pipe is washed. The bathtub water utilization apparatus as described in.

  In the above invention, clean water can be supplied to the tank.

[6] A water level sensor for detecting the water level in the bathtub is further provided,
The said control part performs washing | cleaning of the said middle water supply pipe | tube when the detection water level of the said water level sensor is decreasing rapidly, Bath water as described in any one of [1] thru | or [5] characterized by the above-mentioned. Use device.

  In the above-described invention, when the water level of the bathtub suddenly decreases, that is, when the stopper of the bathtub is removed, the pipe is washed by causing the clean water from the water supply pipe to flow back to the bathtub through the middle water supply pipe. The water after pipe cleaning is drained out of the bathtub from the drain outlet of the bathtub with the plug removed.

[7] The bathtub water use device according to [6], wherein the control unit issues a predetermined warning when the detected water level of the water level sensor rises during the cleaning of the intermediate water supply pipe.

  In the above invention, when the water level in the bathtub rises due to the reverse flow of clean water from the water supply pipe to the bathtub through the middle water supply pipe for pipe cleaning, the bathtub stopper is closed during the pipe cleaning. Judgment is made and a predetermined warning is given. For example, a warning for opening the stopper or a warning for notifying that dirty water during pipe cleaning has been drained into the bathtub.

[8] The solenoid valve with a backflow prevention function includes a discharge port for discharging water that flows back from the outlet side in a state where the water supply is stopped.
The bath water utilization apparatus according to any one of [1] to [7], wherein water flowing out from the discharge port is drained to a predetermined drainage point.

[9] The bathtub water use device according to any one of [1] to [8], wherein the drainage unit drains water in the tank as flush water for a toilet toilet.

  In the said invention, bathtub water is reused for the washing | cleaning of a toilet.

[10] The bathtub water use device according to [9], wherein the tank is installed behind the ceiling of the toilet.

  According to the bathtub water utilization apparatus which concerns on this invention, the inside for piping for transferring bathtub water from a bathtub to a tank can be wash | cleaned, and it can keep clean.

It is a figure which shows the structure and installation state of the bathtub water utilization apparatus which concern on the 1st Embodiment of this invention. It is a figure which shows the structure and operation | movement of a solenoid valve with a backflow prevention function. It is a figure which extracts and shows the structure of the part relevant to piping washing | cleaning of the bathtub water utilization apparatus shown in FIG. It is a front view which shows an example of a remote control. It is a flowchart which shows the outline | summary of the process of the automatic operation of the bath which a bath water heater performs. It is a flowchart which shows the outline | summary of the whole process which a bathtub water utilization apparatus performs. It is a flowchart which shows the detail of a piping washing process (step S204 of FIG. 6). It is a flowchart which shows the detail of a tank replenishment process (step S208 of FIG. 6). It is a flowchart which shows the detail of a toilet heating process (step S209 of FIG. 6). It is a flowchart which shows the detail of waste water treatment (step S210 of FIG. 6). It is a figure which shows the structure and installation state of the bathtub water utilization apparatus which concern on 2nd Embodiment. It is a figure which shows the example which provided the water intake in the bottom part of the bathtub.

  Hereinafter, various embodiments of the present invention will be described with reference to the drawings.

  FIG. 1: has shown the structure and installation state of the bathtub water utilization apparatus 10 which concern on the 1st Embodiment of this invention. The bathtub water utilization apparatus 10 pumps hot water in the bathtub 2 (hereinafter also referred to as bathtub water) into a tank behind the ceiling by a pump 11 and stores the water in the toilet toilet 3 in the toilet. It has a function to use.

  The bathtub water utilization apparatus 10 includes a tank 12 installed at a high place such as a ceiling of a toilet, a pump 11 that pumps bathtub water from the bathtub 2 to the tank 12, a bathtub water level sensor 13 that detects a water level in the bathtub 2, and A tank water level sensor 14 for detecting the water level in the tank 12, a temperature sensor 15 for detecting the temperature of hot water in the tank 12, and a drainage part 16 for draining the hot water in the tank 12 as wash water for the toilet 3. The heat radiation part 17 for heating the toilet with the heat of hot water in the tank 12 and the control board 18 for controlling the operation of the bathtub water utilization apparatus 10 are provided.

  A remote controller 40 (hereinafter referred to as a remote controller 40) of the bathtub water utilization apparatus 10 is provided in the toilet room. The remote controller 40 fulfills a function of receiving an instruction to flow wash water from the tank 12 to the toilet bowl 3 (referred to as a middle water drainage instruction) from the user.

  The capacity of the tank 12 is, for example, about 60 liters. When the amount of wash water in the toilet bowl 3 is 15 liters, the amount of water that can be washed four times can be stored in the tank 12. If the water-saving toilet 3 is used, cleaning can be performed more times. Note that when the water-saving toilet bowl 3 is used, the capacity of the tank 12 may be reduced. The tank 12 has a heat retaining structure. Since the toilet 3 is washed using the hot water in the tank 12, it is possible to obtain a higher detergency than in the case of washing with cold water.

  The tank 12 and the water intake port 2a of the bathtub 2 are connected by a pipe (referred to as a middle water supply pipe 21) that serves as a pumping path for the bathtub water. The bathtub water level sensor 13 and the pump 11 are inserted in the middle water supply pipe 21. In this example, the bathtub water level sensor 13 and the pump 11 are provided in the vicinity of the water intake port 2a of the bathtub 2, that is, at a low height of the same level as the water intake port 2a (or lower than the water intake port 2a). Thereby, priming water can be easily taken in from the bathtub 2 to the pump 11.

  An electromagnetic valve (electromagnetic valve 80B with a backflow prevention function) for switching the intermediate water supply pipe 21 between an open state and a closed state is provided in the vicinity of the tank 12 in the intermediate water supply pipe 21.

  The tank 12 can be replenished with clean water from a predetermined water supply source through the clean water supply pipe 23. When the bath water is insufficient, the water is supplied to the tank 12 from the water supply pipe 23. The water supply pipe 23 and the middle water supply pipe 21 are connected via a solenoid valve 80A with a backflow prevention function, and when cleaning the middle water supply pipe 21, the water from the water supply pipe 23 flows backward. It flows into the middle-water replenishment pipe 21 via the solenoid valve 80 </ b> A with a prevention function and is discharged to the bathtub 2. Details of connection of piping around the solenoid valves 80A and 80B with the backflow prevention function will be described later.

  A drain port is provided at the bottom of the tank 12. A drainage pipe 26 connected to the flush water inlet of the toilet 3 is connected to the drainage port. A drainage part 16 for draining hot water in the tank 12 as cleaning water for the toilet bowl 3 is provided in the middle of the drainage pipe 26. The drainage unit 16 includes a flow sensor 27 for detecting the amount of water flowing through the drainage pipe 26, a drainage electromagnetic valve 28 inserted in series in the drainage pipe 26 in series with the flow sensor 27, and a drainage solenoid valve 28 in parallel. A manual flush valve 29 is provided.

  The drain electromagnetic valve 28 switches the drain pipe 26 between an open state and a closed state. When the bathtub water utilization apparatus 10 receives a middle water drainage instruction from the middle water drainage button 44 (see FIG. 4) of the remote controller 40, the bathtub water utilization device 10 opens the drainage electromagnetic valve 28 and supplies the water in the tank 12 to the toilet 3 as washing water. Drain. At this time, the amount of drainage is detected by the flow sensor 27, and control is performed to close the drainage electromagnetic valve 28 when a predetermined amount of water is reached. The amount of drainage for one middle water drainage instruction can be set in advance using the remote controller 40 or the like.

  The manual flush valve 29 is a valve that receives a manual operation from a user and switches the drainage pipe 26 between an open state and a closed state, and automatically flows a predetermined amount of water after a single drainage operation. Has a close function.

  The heat dissipating unit 17 that heats the toilet with the heat of hot water in the tank 12 includes a heat exchanger 31 that dissipates heat in the tank 12 and a fan 32. The heat exchanger 31 includes a water tube for heat exchange and a plurality of fins provided on the outer peripheral surface of the water tube. Both ends of the water pipe are open to the tank 12.

  On the ceiling of the toilet, a vent 33 is provided at a position corresponding to the installation location of the heat exchanger 31. The air flow generated by the fan 32 passes through the heat exchanger 31 and is sent from the vent 33 to the toilet room. A heat pipe may be used as the heat exchanger 31. Hot water in the tank 12 flows through the heat exchanger 31 by natural convection. In addition, since the heat insulation performance is high in recent houses and the toilet is narrow, the heating capacity of the heat radiating unit 17 may be small.

  A human sensor 35 that detects that a person is in the toilet is provided in the toilet (for example, the ceiling). In addition, the toilet is provided with a ventilation fan 37 for ventilating the inside of the toilet by discharging air to the outdoors. When the radiating unit 17 heats the toilet, if the presence sensor 35 detects that a person is in the toilet, the fan 32 of the radiating unit 17 is stopped and the toilet ventilation fan 37 is operated. The control of stopping the fan 37 and operating the fan 32 of the heat radiating unit 17 is performed. By stopping the ventilation fan 37, the toilet can be effectively heated by the heat of the hot water in the tank 12.

  In addition, a deodorizing device or a sterilizing device may be attached to the tank 12. The deodorizer deodorizes the odor generated by the bathtub water stored in the tank 12. The deodorizing apparatus may be of a type that masks odors or a type that decomposes odors. The sterilization device is a device that performs sterilization of bathtub water stored in the tank 12, suppression of germs, antibacterial activity, and the like. An antibacterial agent may be kneaded into the resin member (housing) constituting the tank 12.

  Further, a ventilation duct 51 for exhausting the air in the tank 12 to the outdoors is provided as a measure against odor. One end of the ventilation duct 51 is open to the upper lid of the tank 12, and the other end is open to the outdoors. A ventilation fan 52 is attached to the other end of the ventilation duct 51.

  The tank 12 is connected to an outdoor drain pipe 54 for making the water in the tank 12 available for watering and car washing outdoors. One end of the outdoor drain pipe 54 opens to the lower part in the tank 12, and an outdoor outlet tap 55 is attached to the other end. Since the tank 12 is provided at a high place, the water discharge pressure can be secured with a difference in elevation.

  The bathtub water level sensor 13 and the tank water level sensor 14 may be selected from various sensors such as a pressure (water pressure) sensor, a water flow switch, a float switch, and an electrode rod. A pressure sensor is suitable for the bathtub water level sensor 13.

  The control board 18 is configured by a circuit having a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory) as main parts, and the CPU executes a program stored in the ROM so that the bathtub is executed. The water utilization apparatus 10 is controlled. A bathtub water level sensor 13, a tank water level sensor 14, a temperature sensor 15, a flow sensor 27, a human sensor 35, and the like are connected to the control board 18, and detection signals output from these are input. The control board 18 is connected to the control signal lines of the pump 11, the solenoid valves 80A and 80B with backflow prevention function, the drainage solenoid valve 28, the fan 32 of the heat radiating unit 17, the ventilation fan 37, and the ventilation fan 52. Control. Further, a remote controller 40 is connected to the control board 18.

  The bathtub water utilization apparatus 10 operates by receiving power supply from a commercial power supply at all times. In preparation for a power failure, the pump 11 may be operable with a battery such as a dry cell, or may be manually operable.

  FIG. 2 shows a configuration example of the electromagnetic valve 80 with a backflow prevention function. The electromagnetic valves 80A and 80B with backflow prevention function shown in FIG. 1 have the same configuration as that shown in FIG.

  The solenoid valve 80 with a backflow prevention function is a solenoid valve having a function of preventing a so-called cross connection, in which a clean water system and another system such as middle water are directly connected.

  The solenoid valve 80 with a backflow prevention function includes an inlet 81 to which a water supply pipe is connected, an outlet 82 to which another system pipe is connected, and a drain outlet for draining water flowing back from the other system pipe. 83.

  Inside, an electromagnetic valve 84, a first valve 85, a second valve 86, and a third valve 87 are provided. In the water passage between the inlet 81 and the outlet 82, the solenoid valve 84, the first valve 85, and the second valve 86 are arranged in series in this order from the inlet 81 side. The electromagnetic valve 84, the first valve 85, and the second valve 86 each open and close the water passage.

  The first valve 85 and the second valve 86 are biased by a spring in the direction of closing the water passage, and when the electromagnetic valve 84 is opened in a state where water is supplied from the water supply pipe to the inlet 81 and water pressure is applied, The first valve 85 is opened by the water pressure of the clean water, and the second valve 86 at the subsequent stage is also opened.

  The drainage port 83 communicates between the first valve 85 and the second valve 86 through the drainage channel, and the third valve 87 is inserted into the drainage channel to open and close the drainage channel. The third valve 87 is biased by a spring in the opening direction. When clean water is supplied from the water supply pipe to the inlet 81 and water pressure is applied to the operation portion of the third valve 87, the third valve 87 is closed, the water supply is shut off, and water pressure is not applied to the operation portion of the third valve 87. And the third valve 87 is opened.

  Fig.2 (a) has shown the state at the time of a water stop. When the water is shut off, the third valve 87 is opened, so that even if the middle water flows backward from the outlet 82 side, it is discharged to the drain outlet 83. FIG. 2B shows a state in which the electromagnetic valve 84 is opened in a normal state where clean water is supplied. FIG. 2C shows a state where the electromagnetic valve 84 is closed in a normal state. In the figure, the flow of water is indicated by broken lines.

  FIG. 3 is a diagram showing in detail the piping connection around the electromagnetic valves 80A and 80B with a backflow prevention function in the bathtub water utilization apparatus 10 shown in FIG. The same parts as those in FIG. 1 are denoted by the same reference numerals.

  The bathtub water utilization apparatus 10 has one end connected to an electromagnetic valve 80A having a backflow prevention function in which a water supply pipe 23 is connected to a forward inlet 81, and an outlet 82 of the electromagnetic valve 80A having a backflow prevention function. Between the water supply pipe 91 merged in the vicinity of the end of the intermediate water supply pipe 21 on the tank 12 side, and between the junction of the water supply pipe 91 in the intermediate water supply pipe 21 and the end of the tank 12 side. And a second electromagnetic valve 80B with a backflow prevention function that opens and closes the middle water supply pipe 21.

  Further, the bath water utilization apparatus 10 includes a water supply pipe 92 that branches from the water supply pipe 91 and communicates with the tank 12, a branch point of the water supply pipe 92, and a junction of the middle water supply pipe 21. A water supply pipe opening / closing solenoid valve 93 is provided which is inserted into the water supply pipe 91 and opens and closes the water supply pipe 91.

  The first drain pipe 94 leading to the toilet 3 is connected to the drain 83 of the electromagnetic valve 80A with the backflow prevention function, and the toilet 3 is connected to the drain 83 of the second solenoid valve 80B with the backflow prevention function. A second drain pipe 95 leading to is connected.

  When cleaning the middle water supply pipe 21, the solenoid valve 84 of the solenoid valve 80A with a backflow prevention function is opened and the water supply pipe opening / closing solenoid valve 93 is opened. Thereby, the clean water from the clean water supply pipe 23 flows out into the bathtub 2 through the clean water delivery pipe 91 and the medium water supply pipe 21, and the medium water supply pipe 21 is washed.

  When the bathtub water is pumped into the tank 12 by the pump 11 and replenished, the water supply pipe opening / closing solenoid valve 93 is closed, the solenoid valve 84 of the second solenoid valve 80B with backflow prevention function is opened, and the pump 11 is operated. When replenishing the tank 12 with clean water, the clean water delivery pipe opening / closing solenoid valve 93 is closed and the solenoid valve 84 of the solenoid valve 80A with a backflow prevention function is opened.

  When water flows back from the water supply pipe 91 side to the outlet 82 of the solenoid valve 80A with the backflow prevention function, the backflowed water passes through the first drain pipe 94 from the drain 83 of the solenoid valve 80A with the backflow prevention function. Drained to 3. When the water in the tank 12 flows back to the outlet 82 of the second solenoid valve 80B with the backflow prevention function, the backflowed water flows from the drain outlet 83 of the second solenoid valve 80B with the backflow prevention function to the second drain pipe. It is drained to the toilet 3 through 95. Thereby, it is prevented that the water in the tank 12 flows backward to the bathtub 2. It should be noted that the water supply pipe opening / closing electromagnetic valve 93 is normally kept closed except when it is opened in the pipe cleaning process.

  Here, the outlet of the intermediate water supply pipe 21 from the outlet 82 of the second solenoid valve 80 </ b> B with the backflow prevention function to the tank 12 is open at the lower part of the tank 12. For example, the outlet of the intermediate water supply pipe 21 and the inlet of the drain pipe 26 are connected in common to the water intake provided at the bottom of the tank 12. In such a configuration, since the outlet of the intermediate water supply pipe 21 is not cut off from the water in the tank 12, the second electromagnetic valve 80 </ b> B with a backflow prevention function is provided so that the water in the tank 12 flows to the bathtub 2. I try not to backflow.

  FIG. 4 shows an example of the remote controller 40. The remote controller 40 includes a display unit 41 and various operation buttons. The operation buttons include an operation button 42, a setting button 43, a middle water drain button 44, a water drain button 45, a pipe cleaning button 46, an up / down key 47 for increasing / decreasing a set value, a toilet heating button 49, and the like. In addition, in the vicinity of each of the middle water drain button 44, the water drain button 45, and the pipe washing button 46 on the right upper side, a lamp 48 that is turned on while the corresponding button is turned on and the operation related to the function is being executed. Is provided.

  The operation button 42 is an operation button for turning on / off the operation of the bathtub water utilization apparatus 10. The setting button 43 is an operation button for entering a setting mode for setting various operating conditions. For example, the amount of washing water drained from the tank 12, the heating setting temperature of the toilet, the pipe washing time interval (set operation time), and the like are set for one middle water drainage instruction.

  The middle water drain button 44 is an operation button for receiving an instruction from the user to flow cleaning water from the tank 12 to the toilet bowl 3. The clean water drain button 45 is an operation button for instructing to use clean water for cleaning the toilet bowl 3. When the water drain button 45 is turned on, the operation of pumping the bathtub water into the tank 12 is not performed, and when the water in the tank 12 is reduced, the water is supplied to the tank 12 from the water supply pipe 23. Become so.

  The pipe cleaning button 46 is an operation button for receiving a cleaning instruction for the middle water supply pipe 21 from the user. Even when the automatic cleaning of the pipe is not performed for a long period of time, the pipe can be cleaned by operating the pipe cleaning button 46.

  The toilet heating button 49 is a switch for switching whether or not the toilet is heated by the heat of hot water in the tank 12.

  The display unit 41 of the remote controller 40 displays the number of times hot water (stored in the water) stored in the tank 12 has been drained into the toilet bowl 3, the amount of remaining water in the tank 12, various warnings, operation guidance, and the like.

  Next, operation | movement of the bathtub water utilization apparatus 10 is demonstrated.

  The bath water utilization apparatus 10 receives the information indicating the end of automatic bath operation from a bath water heater that fills and heats the bath 2 and keeps the bath (heated). Is recognized as being available on the bathtub water utilization device 10 side. First, the automatic bath operation performed by the bath water heater will be briefly described.

  FIG. 5 shows an overview of the automatic bath processing performed by the bath water heater. When the automatic operation is turned on, the bath water heater resets the hot water filling end flag (OFF) (step S101). The hot water filling end flag indicates that automatic bath operation has been completed when ON, that is, bathing into the bathtub 2 has been completed, and the remaining hot water in the bathtub 2 can be used by the bathtub water utilization device 10. . When the hot water filling end flag is OFF, the bathtub water in the bathtub 2 is drawn up by the bathtub water utilization device 10 and cannot be used.

  Next, the bath water heater starts a 4-hour heat retention timer (step S102). The bath water heater has a function of automatically terminating the automatic operation of the bath when a predetermined time (here, 4 hours) has elapsed since the start of the operation, and the 4-hour heat retention timer is a timer for that purpose.

  Next, the bath water heater fills the bathtub 2 up to the set water level, and chases until the hot water in the bathtub 2 reaches the set temperature (step S103). Thereafter, pouring and reheating are appropriately performed so that the water level and temperature of the hot water in the bathtub 2 are maintained at the set water level and the set temperature (Step S104; No, Step S105; No).

  When the bath water heater detects that the water level in the bathtub 2 has suddenly decreased (the bathtub has been unplugged) during the automatic operation of the bath (step S104; Yes), or after starting the automatic operation of the bath When the predetermined time has passed (the 4-hour heat retention timer has expired) (step S105; Yes), the hot water filling end flag is turned on (step S106), and the automatic bath operation is terminated. Even when the automatic operation is turned OFF by manual operation, the hot water end flag is turned ON to end the automatic operation of the bath.

  FIG. 6 shows an overview of the entire process performed by the bathtub water utilization apparatus 10. The bathtub water utilization device 10 has a function of pumping the remaining hot water in the bathtub 2 into the tank 12, a function of supplying fresh water to the tank 12 when the hot water in the bathtub 2 cannot be used, and the toilet water in the tank 12 3, a function of draining as wash water, a function of cleaning the middle water supply pipe 21 with clean water, and a function of heating the toilet with the heat of hot water in the tank 12.

  The bathtub water utilization apparatus 10 repeatedly performs the process shown in FIG. 6 continuously while the power is on. First, it is checked whether or not the operation button 42 of the remote controller 40 is turned on (step S201). While the operation button 42 is OFF (step S201; No), the tank 12 is kept at the highest water level. Water is supplied to the tank 12 (step S202).

  Specifically, it is checked whether or not the detected water level of the tank water level sensor 14 is the highest water level of the tank 12, and if it is not the highest water level, the electromagnetic valve 84 of the electromagnetic valve 80A with a backflow prevention function is opened. Control such as closing the solenoid valve 84 of the solenoid valve with function 80A is repeated while the operation button 42 is OFF. Even when the operation button 42 is in the OFF state, the toilet bowl 3 can be washed by draining from the tank 12 by operating the manual flush valve 29.

  If the operation button 42 of the remote controller 40 is ON (step S201; Yes), it is checked whether the pipe cleaning flag is ON (step S203). If the pipe cleaning flag is ON (step S203; Yes), pipe cleaning processing is performed (step S204), and the process proceeds to step S209.

  If the pipe cleaning flag is OFF (step S203; No), it is checked whether or not the water level in the tank 12 detected by the tank water level sensor 14 is the highest water level (step S205). If it is the highest water level (step S205; Yes), that effect is displayed on the display unit 41 of the remote controller 40 (step S206). For example, “tank full” is displayed. Then, the middle water drainage counter is reset to 0 (step S207), and the process proceeds to step S209. The middle water drainage counter is a counter that indicates the number of times that the toilet bowl 3 has been washed in accordance with the operation of the middle water drainage button 44 of the remote controller 40 after the tank 12 is replenished with bathtub water or clean water to bring the tank 12 to the highest water level. .

  If the water level in the tank 12 detected by the tank water level sensor 14 is not the highest water level (step S205; No), a tank replenishment process for replenishing the tank 12 with bathtub water or clean water is executed (step S208), and the process proceeds to step S209. Transition.

  In step S209, a toilet heating process for heating the toilet with the heat of hot water in the tank 12 is performed.

  Next, in response to pressing of the middle water drain button 44 of the remote controller 40, a drain process is performed to drain hot water in the tank 12 into the toilet 3 as washing water (step S210).

  Next, it is checked whether or not the water drain button 45 is ON (step S211). If the water drain button 45 is ON (step S211; Yes), the water drain flag is set to ON (step S212) and the process proceeds to step S214. If the water drain button 45 is OFF (step S211; No), the water drain flag is set to OFF (step S213) and the process proceeds to step S214. In addition, when the water supply drainage flag is set to ON, water is supplied to the tank 12 in the tank supply process regardless of whether the bath water is available.

  In step S214, it is checked whether the continuous operation time using medium water is less than a predetermined set operation time. The middle water use continuous operation time is an elapsed time since the middle water supply pipe 21 was washed last time. The CPU or the like of the control board 18 measures the continuous water use continuous operation time.

  If the middle water use continuous operation time is equal to or longer than the set operation time (step S214; No), the pipe cleaning flag is turned on (step S215), and the process returns to step S201 to continue the processing. If the middle water use continuous operation time is less than the set operation time (step S214; Yes), the process returns to step S201 to continue the process.

  FIG. 7 shows details of the pipe cleaning process (step S204 in FIG. 6). In the bathtub water utilization apparatus 10, the tap water from the tap water supply pipe 23 flows directly to the middle water supply pipe 21. In the pipe cleaning, the dirty water that has washed the middle water supply pipe 21 is discharged into the bathtub 2, and therefore it is necessary to perform the pipe cleaning with the stopper of the bathtub 2 removed. Here, it is detected that the tap has been removed by a sudden decrease in the water level of the bathtub, and the tap water supplied from the tap water supply pipe 23 at the timing at which the tap is removed from the intake port 2a through the intermediate water supply pipe 21. 2 and the inside of the intermediate water supply pipe 21 is washed. The dirty water that has washed the intermediate water supply pipe 21 is discharged from the drain outlet of the bathtub 2 to the outside.

  The sudden decrease in the bath water level does not include a slight decrease in water level due to normal evaporation or leakage from a plugged drain. Specifically, based on the drop rate of the bathtub water level when the bathtub water is drained from the drain port with the smallest diameter assumed as the drain port of the bathtub, the drop rate is slower than this drop rate by a certain margin amount. A rapid decrease is determined as a threshold value. For example, here, the case where the water level is lowered continuously for a certain period of time at a speed of 5 cm / min or more is detected as a sudden decrease in the bathtub water level.

  When the water level of the bathtub 2 rises during the cleaning of the middle water supply pipe 21, it is recognized that the drain outlet of the bathtub 2 has been plugged, and the display unit 41 of the remote control 40 indicates that “the bathtub plug is opened. Please display a warning.

  By the way, there is a user who wants to keep water in the bathtub 2 even after the automatic operation of the bath is finished and to use the bathtub water as a water reserve at the time of disaster. Since such a user unplugs the bathtub 2 just before filling the next day, it is inconvenient for such a user to detect that the bathtub 2 has been unplugged and automatically start pipe cleaning. . Therefore, the automatic cleaning of the pipe may be prohibited for 15 to 24 hours after hot water is filled in the bathtub 2 (after the water level is detected).

  The details of the pipe cleaning process will be described with reference to FIG.

  First, it is checked whether or not the water level of the bathtub 2 is rapidly decreasing (step S302). If the water level is not rapidly decreasing (step S302; No), this process is temporarily ended (return). If the water level of the bathtub 2 is decreasing rapidly (step S302; Yes), it waits for the water level of the bathtub 2 to become less than a predetermined water level (no bathtub water level) (step S303; Yes).

  When the water level of the bathtub 2 is lowered to the point where there is no bathtub water level (step S303; No), the electromagnetic valve 84 of the electromagnetic valve 80A with backflow prevention function is opened, and the water supply pipe opening / closing electromagnetic valve 93 is opened (step S304). Thus, clean water flows out into the bathtub 2 through the intermediate water supply pipe 21 and the inside of the intermediate water supply pipe 21 is washed.

  At this time, when the bathtub water level is present (step S305; Yes), the water level of the bathtub 2 has risen by discharging the clean water from the middle water supply pipe 21 to the bathtub 2, so the stopper of the bathtub 2 is closed. Can be estimated. Therefore, a warning such as “please open the bathtub plug” is displayed on the display unit 41 of the remote controller 40 (step S306), the solenoid valve 84 of the solenoid valve 80A with backflow prevention function is closed, and the water supply pipe opening / closing solenoid valve is closed. 93 is closed (step S307), and the process returns to step S305. The warning display continues until there is no bathtub water level.

  If there is no bathtub water level (step S305; No), it will be investigated whether the washing | cleaning time reached the preset washing | cleaning time set beforehand (step S308). If the cleaning for the set cleaning time is not completed (step S308; No), the process proceeds to step S304, and the cleaning of the middle water supply pipe 21 with the clean water is continued.

  When the set cleaning time is completed (step S308; Yes), the electromagnetic valve 84 of the electromagnetic valve 80A with the backflow prevention function is closed, and the water supply pipe opening / closing electromagnetic valve 93 is closed (step S309). Next, the pipe cleaning flag is turned OFF, the continuous operation time using medium water is reset to 0 (step S310), and this process is terminated (return).

  When the pipe cleaning button 46 of the remote controller 40 is operated (when a manual pipe cleaning instruction is received), the pipe cleaning flag is set to ON (step S301), and the process proceeds to step S302.

  It should be noted that the water supply pipe opening / closing electromagnetic valve 93 is normally kept closed except when it is opened in the pipe cleaning process.

  FIG. 8 shows the tank replenishment process (step S208 in FIG. 6). In the tank replenishment process, when the amount of water in the tank 12 has decreased by a certain level or more, the bathtub water is pumped from the bathtub 2 to the tank 12 or replenished, or the water is replenished to the tank 12 through the water supply pipe 23. In this process, the operation of pumping up the bathtub water from the bathtub 2 to the tank 12 is performed at the following timing on the condition that the automatic operation of the bath has been completed.

(1) Immediately after the automatic operation of the bath is finished (2) When the bath water level suddenly decreases (3) Every time the toilet 3 is washed twice with drainage of the middle water Here, the replenishment operation of (1) Only when the amount of water in the inside has decreased more than a certain level. However, even if the amount of water in the tank 12 does not decrease more than a certain amount, the tank 12 may be pumped up to the highest water level immediately after the automatic operation of the bath is finished.

  The supply of clean water is performed when the bath water cannot be used (the automatic bath operation has not been completed or the bath water level is not present), or when the clean water discharge mode is set.

  By replenishing the bath water to the tank 12 immediately after the automatic operation of the bath is completed, the remaining hot water in the bath can be replenished to the tank 12, and toilet heating using the heat of the hot water in the tank 12 to be described later Can be performed efficiently.

  Details of the tank replenishment process of FIG. 8 will be described. First, it is checked whether or not there is a certain amount or more of bathtub water (there is a bathtub water level) in the bathtub 2 (step S401). If there is no bathtub water level (step S401; No), it is checked whether the middle water drainage counter is 3 or more (step S402; No). If not, the tank 12 still has water. This process is finished (return).

  If there is no bathtub water level (step S401; No) and the middle water drainage counter is 3 or more (step S402; Yes), the tank 12 is replenished with clean water to bring the tank 12 to the highest water level (step S403). Specifically, the solenoid valve 84 of the solenoid valve 80A with the backflow prevention function is opened with the water supply pipe opening / closing solenoid valve 93 closed, and when the tank water level sensor 14 detects the maximum water level, the solenoid valve 80A with the backflow prevention function is opened. The electromagnetic valve 84 is closed. Then, the middle water drainage counter is reset to 0 (step S404), and this process is terminated (return).

  If there is more than a certain amount of bathtub water in the bathtub 2 (there is a bathtub water level) (step S401; Yes), it is checked whether or not the water level of the bathtub 2 is rapidly decreasing (step S405). If the water level of the bathtub 2 is not rapidly decreasing (step S405; No), it is checked whether the middle water drainage counter is 2 or more (step S406). If the middle water drainage counter is not 2 or more (step S406; No), the tank 12 still has water, so this process is terminated without replenishing water (return).

  When the middle water drainage counter is 2 or more (step S406; Yes), or when the water level of the bathtub 2 is rapidly decreasing in step S405 (step S405; Yes), it is checked whether or not the water drainage flag is ON ( Step S407). If the water drainage flag is ON (step S407; Yes), the water drainage button 45 is operated to set the water drainage mode, and the process proceeds to step S403.

  If the water drainage flag is not ON (step S407; No), it is checked whether the hot water filling end flag is ON (step S408). If the hot water filling end flag is not ON (step S408; No), the automatic bath operation has not ended (during operation), so the process proceeds to step S402. Process to replenish water.

  If the hot water filling end flag is ON (step S408; Yes), the bath water is pumped up from the bathtub 2 and replenished to the tank 12. In detail, the solenoid valve 84 of the 2nd solenoid valve 80B with a backflow prevention function which operates the pump 11 and is inserted in the middle water supply pipe 21 is opened (step S409). Thereafter, when the water level in the tank 12 reaches the maximum water level (step S410; Yes), the pump 11 is stopped, and the electromagnetic valve 84 of the second electromagnetic valve 80B with backflow prevention function is closed (step S412). Furthermore, the middle water drainage counter is reset to 0 (step S413), and this process is terminated (return).

  Before the water level in the tank 12 reaches the maximum water level (step S410; No), if the bathtub water in the bathtub 2 runs out (no bath water level) (step S411; No), the pump 11 is stopped. Then, after closing the solenoid valve 84 of the second solenoid valve 80B with the backflow prevention function (step S414), the process proceeds to step S402 to switch to water supply.

  Next, toilet heating will be described.

  The bathtub water utilization device 10 heats the toilet using the heat of the hot water in the tank 12. Specifically, a fan 32 sends a wind to a heat exchanger 31 that dissipates the heat of hot water in the tank 12, and the wind is sent from a vent 33 provided on the ceiling of the toilet into the toilet room for heating. In addition, the operation of the ventilation fan 37 of the toilet and the operation of the fan 32 of the heat radiating unit 17 are controlled to achieve both ventilation and efficient heating when using the toilet.

  Specifically, the human sensor 35 detects a person, and the ventilation fan 37 is operated and ventilated while the toilet is in use and until a predetermined time has elapsed after use, and the fan 32 of the heat radiating unit 17 is stopped (heating is stopped). Stop). In other periods, the ventilation fan 37 is stopped. In other periods, if the temperature of the hot water in the tank 12 is equal to or higher than the temperature at which heating is possible, the fan 32 of the heat radiating unit 17 is operated to heat the toilet.

  When performing toilet heating, it is preferable that the tank 12 has a heat retaining structure.

  FIG. 9 shows details of the toilet heating process (step S209 in FIG. 6). This process is repeatedly executed every time the process of FIG. When the human sensor 35 provided in the toilet is ON (detects a person) (step S501; Yes), the ventilation fan 37 is operated (step S504), and the fan 32 of the heat radiating unit 17 is stopped ( Step S505), the process ends (return).

  When the human sensor 35 is OFF (no person is detected) (step S501; No), it is checked whether or not the toilet heating is set to ON by the toilet heating button 49 of the remote controller 40 (step S502). ). When toilet heating is set to ON (step S502; Yes), the water temperature in the tank 12 (detected temperature of the temperature sensor 15) is a temperature obtained by adding a predetermined temperature (for example, 10 ° C.) to the heating set temperature ( It is checked whether the temperature is higher than the heating possible temperature (step S503).

  When the water temperature in the tank 12 (detected temperature of the temperature sensor 15) is equal to or lower than the heating possible temperature (step S503; No), the fan 32 of the heat radiating unit 17 is turned off (step S505), and this process is terminated (return). ).

  When the water temperature in the tank 12 (detected temperature of the temperature sensor 15) is higher than the temperature at which heating is possible (step S503; Yes), it is checked whether or not a predetermined time has elapsed since the human sensor 35 was turned off ( Step S506). If the predetermined time has not elapsed since the human sensor 35 is turned off (step S506; No), the process is ended without heating because the air is being ventilated (return). When the predetermined time has elapsed since the human sensor 35 is turned off (step S506; Yes), the ventilation fan 37 is turned off (step S507), and the fan 32 of the heat radiating unit 17 is turned on (step S508). ) The toilet is heated and the process is terminated (return). The predetermined time can be arbitrarily changed by the remote controller 40 or the like. For example, it can be set between 3 minutes and 10 minutes.

  When toilet heating is set to OFF (step S502; No), the fan 32 of the heat radiating unit 17 is turned off (step S509). If the predetermined time has not elapsed since the human sensor 35 is turned off (step S510; No), this processing is ended (return) and ventilation is continued, and the human sensor 35 is turned off. If the predetermined time has elapsed (step S510; Yes), the ventilation fan 37 of the toilet is turned off (step S511), the ventilation is stopped, and this process is terminated (return).

  Thus, since the ventilation fan 37 of the toilet is stopped except during use, the toilet can be efficiently heated using the heat of hot water in the tank 12. In addition, the ventilation fan 37 is operated for a predetermined time during and after use of the toilet to ensure ventilation, and during this time, the fan 32 of the heat dissipating unit 17 is stopped, so that the heat in the tank 12 is not wasted, The heat of the hot water in the tank 12 can be used effectively.

  Next, a drainage process for draining hot water from the tank 12 and washing the toilet bowl 3 will be described.

  In the drainage treatment, when the middle water drainage button 44 of the remote controller 40 is pressed, the set amount of water in the tank 12 is drained to the toilet 3. If the water in the tank 12 is insufficient during drainage, continue draining while replenishing the tank 12 with clean water. After the set amount of drainage is completed, tank the clean water until the tank 12 reaches the maximum water level. Replenish 12 This case may occur after recovery from a power failure.

  The bath water utilization device 10 resets the middle water drainage counter to 0 when the tank 12 is supplied with clean water or bathtub water to the maximum water level, and each time the toilet 3 is washed by the operation of the middle water drainage button 44, The operation is such that the drain counter is incremented by 1 and the water or bath water is replenished to the tank 12 again when the intermediate water drain counter reaches 2 or more. That is, water is supplied to the tank 12 every time the toilet bowl 3 is washed twice. Since the capacity of the tank 12 is such that the toilet 3 can be washed about four times, the water in the tank 12 is insufficient during drainage from the tank 12 to the toilet 3 as long as it is replenished after every two washings as described above. There is nothing.

  However, if a power failure occurs, the middle water drainage counter is reset to 0. For example, when the middle water drainage counter is counted up to 2, if a power failure occurs, the amount of water in the tank 12 is reduced when the power is restored from the power failure. Despite being reduced by two washings, the middle water drainage counter is zero. Therefore, drainage is performed from the tank 12 to the toilet 3 without replenishing water, and there is a situation where water in the tank 12 is insufficient during drainage.

  Even if the middle water drainage counter is constituted by a non-volatile counter that is not reset even if the power is turned off (the count value is not lost), the manual flush valve 29 is operated during a power failure to drain the water from the tank 12 to the toilet 3. In such a case, the water level in the tank 12 at the time of recovery from the power failure becomes inconsistent with the value of the middle water drainage counter, and the water in the tank 12 is drained from the tank 12 to the toilet 3 after recovery from the power failure. There may be a phenomenon of lack of.

  FIG. 10 shows details of the waste water treatment (step S210 in FIG. 6). This process is repeatedly executed every time the process of FIG. The bathtub water utilization apparatus 10 checks whether or not the middle water drain button 44 of the remote controller 40 has been pressed and turned on (step S601). When the middle water drain button 44 is not turned on (step S601; No), this process is terminated (return).

  When the middle water drain button 44 is turned on (step S601; Yes), the middle water drain counter is counted up (+1) (step S602). Subsequently, the drain electromagnetic valve 28 of the drainage unit 16 is opened (step S603), and the drainage is discharged from the tank 12 to the toilet 3 through the drainage pipe 26, and the amount of drainage is measured by the flow sensor 27.

  During drainage, whether the drainage amount has reached the set water amount (step S604) and whether the tank 12 has run out of water during drainage (the second electrode 14b of the tank water level sensor 14 no longer detects the water level). Is monitored (step S605).

  When the water in the tank 12 is insufficient during drainage (step S605; Yes), the manual water use flag is set to ON (step S606), and the solenoid valve 80A of the water supply water supply pipe 23 with the backflow prevention function 80A is set. 84 is opened (step S607), the process returns to step S604 to continue draining. That is, clean water is supplied to the tank 12 while draining from the tank 12.

  When the amount of drainage reaches the set amount of water (step S604; Yes), the drainage solenoid valve 28 is closed to stop drainage from the tank 12 (step S608), and the solenoid valve 84 of the solenoid valve 80A with backflow prevention function is closed. The supply of clean water to is stopped (step S609). Thereafter, it is checked whether or not the manual water use flag is ON. If it is not ON (step S610; No), this process ends (return). If the manual water use flag is ON (step S610; Yes), water is supplied to the tank 12 until the tank 12 reaches the maximum water level (step S611), and the manual water use flag is reset to OFF (step S611). S612), this process ends (return).

  Next, a second embodiment of the present invention will be described.

  FIG. 11 shows a bathtub water utilization apparatus 10B according to the second embodiment. In FIG. 11, portions not related to cleaning of the middle water supply pipe 21 such as toilet heating and ventilation for preventing odors are omitted as appropriate. The same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals.

  As in the first embodiment, the bathtub water utilization apparatus 10B feeds water (water) supplied through the water supply pipe 23 into the middle water supply pipe 21 via the electromagnetic valve 80A with a backflow prevention function. The middle water supply pipe 21 is washed. In the bathtub water utilization apparatus 10B, the water in the tank 12 and the middle water supply pipe 21 are cut off by the height difference (space) in the tank.

  The bathtub water utilization apparatus 10B has one end connected to the solenoid valve 80A with a backflow prevention function in which the water supply pipe 23 is connected to the forward inlet 81, and the outlet 82 of the solenoid valve 80A with the backflow prevention function. Between the water supply pipe 91 merged in the vicinity of the end of the intermediate water supply pipe 21 on the tank 12 side, and between the junction of the water supply pipe 91 in the intermediate water supply pipe 21 and the end of the tank 12 side. And a middle water solenoid valve 22 that opens and closes the middle water supply pipe 21. The intermediate water supply pipe 21 opens into the tank 12 at a position higher than the highest water level of the tank 12.

  Furthermore, the bathtub water utilization apparatus 10B branches from the water supply pipe 23, and is connected to the water supply pipe 97 and the water supply pipe 97 open to the tank 12 at a position where the end is higher than the highest water level of the tank 12. A water supply electromagnetic valve 98 that opens and closes the water supply pipe 97 is provided. A first drain pipe 94 leading to the toilet 3 is connected to the drain port 83 of the electromagnetic valve 80A with a backflow prevention function.

  In the bath water utilization apparatus 10B, when cleaning the middle water replenishment pipe 21, the electromagnetic valve 84 of the electromagnetic valve 80A with a backflow prevention function is opened, the water replenishment electromagnetic valve 98 is closed, and the middle water solenoid valve 22 is closed. Thereby, the clean water from the clean water supply pipe 23 flows out into the bathtub 2 through the clean water delivery pipe 91 and the medium water supply pipe 21, and the medium water supply pipe 21 is washed.

  When the bathtub water is pumped into the tank 12 by the pump 11 and replenished, the solenoid valve 84 of the solenoid valve 80A with a backflow prevention function is closed, the water supply solenoid valve 98 is closed, the middle water solenoid valve 22 is opened, and the pump 11 is turned on. Make it work. When water is replenished to the tank 12, the electromagnetic valve 84 of the electromagnetic valve 80A with backflow prevention function is closed and the water replenishment electromagnetic valve 98 is opened.

  Since the water supply pipe 97 and the middle water supply pipe 21 are opened in the tank 12 at a position higher than the highest water level of the tank 12, the water is cut off from the water in the tank 12 by the space. Thereby, for example, even if the water supply electromagnetic valve 98 fails, the water in the tank 12 does not flow backward to the water supply pipe 23. Further, even if the middle water solenoid valve 22 fails, the water in the tank 12 does not flow backward to the bathtub 2.

  The flow of the pipe cleaning process of the bathtub water utilization apparatus 10B is basically the same as that in FIG. However, in step S304, the electromagnetic valve 84 of the electromagnetic valve 80A with the backflow prevention function is opened, and in steps S307 and S309, the electromagnetic valve 84 of the electromagnetic valve 80A with the backflow prevention function is closed. Further, the middle water solenoid valve 22 and the water replenishment solenoid valve 98 are kept closed during pipe cleaning.

  The embodiment of the present invention has been described with reference to the drawings. However, the specific configuration is not limited to that shown in the embodiment, and there are changes and additions within the scope of the present invention. Are also included in the present invention.

  For example, the water intake 2a may be provided at the bottom of the bathtub 2 as shown in FIG. As a result, more remaining hot water can be transferred to the tank 12 for use.

  Further, the pump 11 may be installed above the ceiling. In addition, when the pump 11 is installed upward, even if the pump 11 is operated in the forward direction, the bath water is not sucked at first. Therefore, a test operation mode or the like is provided. First, water is stored in the tank 12 (for example, water is stored from the water supply water supply pipe 23), and then the pump 11 is reversed to flow the water back from the tank 12 to the pump 11. The pump 11 may be given priming water.

  The toilet bowl 3 may have a low tank (without hand washing). In the case of having a low tank, the flow sensor 27 may not be provided. Further, for example, the drain electromagnetic valve 28 and the manual flush valve 29 may not be provided.

  In the embodiment, the drainage amount is measured by the flow sensor 27, and the drainage electromagnetic valve 28 is controlled to be closed when the set amount of water is drained in response to one operation of the middle water drainage button 44. The drain electromagnetic valve 28 may be closed with drainage.

  In the embodiment, the water supply timing to the tank 12 is managed by the middle water drainage counter. For example, the remaining water amount in the tank 12 is recognized from the drainage amount detected by the flow sensor 27 after the tank 12 is set to the maximum water level. Thus, the water supply time or the like may be controlled.

  In the embodiment, the tank 12 is installed behind the ceiling of the toilet. However, as long as the tank 12 is above the toilet 3, that is, the water in the tank 12 may be drained from the tank 12 to the toilet 3 by natural fall using potential energy. It is not limited to the ceiling.

  The use of the water stored in the tank 12 is not limited to the cleaning of the toilet bowl 3. It may be automatic watering of garden trees.

DESCRIPTION OF SYMBOLS 2 ... Bath 2a ... Water intake 3 ... Toilet 10, 10B ... Bath water utilization apparatus 11 ... Pump 12 ... Tank 13 ... Bath water level sensor 14 ... Tank water level sensor 15 ... Temperature sensor 16 ... Drain part 17 ... Radiation part 18 ... Control board DESCRIPTION OF SYMBOLS 21 ... Middle water supply pipe 22 ... Middle water solenoid valve 23 ... Water supply water pipe 26 ... Drain piping 27 ... Flow sensor 28 ... Drain solenoid valve 29 ... Manual flush valve 31 ... Heat exchanger 32 ... Fan 33 ... Vent 35 ... Human sensor 37 ... Ventilation fan 40 ... Remote control 41 ... Display unit 42 ... Operation button 43 ... Setting button 44 ... Medium water drain button 45 ... Water drain button 46 ... Pipe cleaning button 47 ... Up / down key 48 ... Lamp 49 ... Toilet heating Button 51 ... Ventilation duct 52 ... Ventilation fan 54 ... Outdoor drain piping 55 ... Outlet tap 58 ... Heat exchanger 80, 80A, 80B ... Solenoid valve with backflow prevention function 81 ... Inlet 8 ... Exit 83 ... Drain outlet 84 ... Solenoid valve 85 ... First valve 86 ... Second valve 87 ... Third valve 91 ... Water supply pipe 92 ... Water supply pipe 93 ... Water supply pipe open / close solenoid valve 94 ... First Drain pipe 95 ... second drain pipe 97 ... water supply pipe 98 ... water supply solenoid valve

Claims (10)

A tank,
A medium water supply pipe connecting between the tank and the water intake of the bathtub;
A pump for pumping water in the bathtub to the tank through the intermediate water supply pipe;
A solenoid valve with a backflow prevention function in which a water supply pipe is connected to the forward entry side;
One end is connected to the outlet side of the solenoid valve with the backflow prevention function, and the other end is joined to the vicinity of the tank side end of the middle water replenishment pipe,
An electromagnetic valve that opens and closes the intermediate water supply pipe between a confluence of the water supply pipe and the end on the tank side of the intermediate water supply pipe;
A drainage section for draining hot water in the tank to a predetermined outlet according to a request for reuse of hot water in the tank;
When the hot water in the bathtub is pumped into the tank, the solenoid valve with a backflow prevention function is closed, and the solenoid valve is opened to operate the pump, and when cleaning the intermediate water supply pipe, the solenoid valve is A control unit that controls to open the electromagnetic valve with a backflow prevention function in a closed state and to flow clean water from the water supply pipe into the bathtub;
A bath water utilization device characterized by comprising: The bath water utilization apparatus according to claim 1, wherein the intermediate water supply pipe opens into the tank at a position higher than a maximum water level of the tank. The bathtub water utilization device according to claim 1, wherein the solenoid valve is a second solenoid valve with a backflow prevention function whose forward outlet side is the tank side. A water supply pipe branched from the water supply pipe on the entrance side of the solenoid valve with the backflow prevention function, and a terminal end opened to the tank at a position higher than the highest water level of the tank;
A second solenoid valve for opening and closing the water supply pipe;
The bath water utilization apparatus according to any one of claims 1 to 3, wherein the bathtub water utilization apparatus is provided. A water supply pipe branched from the water supply pipe and leading into the tank;
A third solenoid valve that opens and closes the water supply pipe between the branch point of the water supply pipe and the junction;
The control unit closes the third electromagnetic valve when pumping the water in the bathtub into the tank with the pump, opens the electromagnetic valve, and supplies water to the tank when the water is supplied to the tank. The third solenoid valve is closed, and the third solenoid valve is opened and the solenoid valve is closed when the middle water supply pipe is washed. 4. Bathtub water utilization device. A water level sensor for detecting the water level in the bathtub,
6. The bath water utilization apparatus according to claim 1, wherein the control unit performs cleaning of the intermediate water supply pipe when the detected water level of the water level sensor is rapidly decreasing. . The said control part performs a predetermined | prescribed warning, when the detection water level of the said water level sensor rises during washing | cleaning of the said middle water replenishment pipe. The bathtub water utilization apparatus of Claim 6 characterized by the above-mentioned. The solenoid valve with a backflow prevention function includes a discharge port that discharges water that has flowed back from the outlet side in a state where the water supply has stopped,
The water which flows out from the said discharge port was drained to the predetermined | prescribed drainage location. The bathtub water utilization apparatus as described in any one of the Claims 1 thru | or 7 characterized by the above-mentioned. The said drainage part drains the water in the said tank as washing water of the toilet bowl of a toilet. The bathtub water utilization apparatus as described in any one of Claim 1 thru | or 8 characterized by the above-mentioned. The said tank is installed in the ceiling back of the said toilet. The bathtub water utilization apparatus of Claim 9 characterized by the above-mentioned.

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