JP6769778B2 - Bathtub cleaning system - Google Patents

Description

The present invention relates to a bathtub cleaning system having a bathtub cleaning function for automatically cleaning a bathtub. In particular, the present invention relates to preventing backflow of detergent into clean water in a bathtub cleaning system.

Conventionally, there is known a bathtub cleaning system having a bathtub cleaning function of spraying a cleaning liquid into a bathtub to wash off dirt adhering to the inner wall surface of the bathtub. In this type of bathtub cleaning system, for example, hot water heated by a water heater and detergent are mixed in a detergent mixing section to generate a cleaning liquid, and the cleaning liquid is supplied to a cleaning nozzle. Therefore, if the cleaning liquid flows back through the hot water supply pipe that supplies hot water from the water heater to the detergent mixing portion, the clean water may be contaminated. Therefore, it has been proposed to provide a check valve in the hot water supply pipe on the upstream side of the detergent mixing portion where the hot water and the detergent are mixed (for example, Patent Documents 1 and 2).

Japanese Unexamined Patent Publication No. 2003-61850 Japanese Patent Application Laid-Open No. 11-299671

However, the check valves such as Patent Documents 1 and 2 have a problem that backflow cannot be prevented when a valve failure occurs.

The present invention solves the above problems, and an object of the present invention is to reliably prevent backflow of detergent to the clean water side in a bathtub cleaning system.

According to the present invention
A water heater that heats clean water to generate hot water,
With a bathtub
A detergent tank for storing detergent and
A detergent mixing part that mixes the detergent supplied from the detergent tank and the hot water supplied from the water heater to generate a cleaning liquid,
A cleaning nozzle that sprays cleaning liquid into the bathtub,
A cleaning pipe that connects the detergent mixing part and the cleaning nozzle,
A hot water supply pipe that guides hot water from the water heater to the detergent mixing section,
Backflow prevention means provided between the detergent mixing section and the water heater,
A pump provided between the cleaning nozzle and the backflow prevention means to inject the cleaning liquid from the cleaning nozzle,
A hot water mixing section that is provided between the backflow prevention means and the water heater and mixes the hot water supplied from the water heater and the water supplied from the clean water side.
A hot water supply pipe for hot water filling that branches from the hot water supply pipe on the upstream side that connects the backflow prevention means and the hot water mixing part, and is connected to the hot water tap.
In the hot water mixing section, the hot water supply pipe on the upstream side is provided by the solenoid valve for replenishment water provided on the downstream side of the branch of the hot water supply pipe for hot water filling and the on-off valve provided on the hot water supply pipe for hot water filling. It is equipped with a flow path switching unit that switches the mixed hot water to the backflow prevention means side or the hot water tap side .
Detergent mixing section, backflow preventing means, a pump, a tub cleaning system that having a cleaning unit comprising hot and cold water mixing unit, and the flow path switching unit,
The backflow prevention means is connected to the hot water supply pipe on the upstream side and discharges the hot water supplied from the water heater, the overflow port located below the water supply port, and the overflow port located below the overflow port and downstream. A bathtub cleaning system is provided that is connected to a hot water supply pipe on the side, has a tank with an outflow port for hot water to flow out, and has a structure for forming a spout space between a refill port and an overflow port to prevent backflow. To.

According to the bathtub cleaning system, a backflow prevention means using a spout space is provided between a detergent mixing section that mixes detergent and hot water and a water heater to which clean water is supplied, so that hot water can be discharged. Even if a large amount of backflow occurs in the stored tank, the liquid level does not rise above the overflow port, so the detergent invades the refill port located above the overflow port through the spout space. It is possible to reliably prevent detergent from entering the hot water supply pipe connected to the water heater. In addition, since a pump is provided between the cleaning nozzle and the backflow prevention means, the hot water flows back even if the hot water supply pipe connected to the water heater is cut off by the backflow prevention means using the spout space. It can be smoothly supplied to the cleaning nozzle from the preventive means. Therefore, even in a low water pressure area where the water supply pressure is low, the cleaning liquid and hot water for rinsing can be supplied to the bathtub at a predetermined injection flow rate.

Further , according to the bathtub cleaning system, a hot water mixing section for mixing hot water supplied from the water heater and water supplied from the clean water side is provided between the backflow prevention means and the water heater. , Even a water heater that does not have a temperature change function can supply hot water at a predetermined temperature. Therefore, a hot water filling function and a bathtub cleaning function can be provided.

As described above, according to the present invention, since the backflow prevention means using the spout space is provided between the detergent mixing portion and the water heater, the backflow of the detergent to the clean water side can be reliably prevented. ..

FIG. 1 is a schematic configuration diagram of a bathtub cleaning system according to a first embodiment of the present invention. FIG. 2 is a schematic configuration diagram of a bathtub cleaning system according to a second embodiment of the present invention. FIG. 3 is a schematic configuration diagram of a bathtub cleaning system according to a third embodiment of the present invention. FIG. 4 is a schematic configuration diagram of the bathtub cleaning system according to the fourth embodiment of the present invention. FIG. 5 is a schematic configuration diagram of a bathtub cleaning system according to a fifth embodiment of the present invention.

FIG. 1 is a schematic configuration diagram showing an example of a bathtub cleaning system according to the first embodiment. This bathtub cleaning system includes a bathtub 1, a cleaning unit 4 for automatically cleaning the bathtub 1, and a water heater 6 for supplying hot water to the cleaning unit 4 during hot water filling, reheating, and hot water supply operations. , A bath remote control 10a and a cleaning remote control 10b are provided.

A drain plug 2 for draining bathtub water and a cleaning nozzle 7 for injecting cleaning liquid are provided at the bottom of the bathtub 1, and hot water for filling or reheating the inner wall of the bathtub 1 is provided. A circulation metal fitting (hot water filling adapter) 5 to which the water is supplied is provided. The drain plug 2 is configured to be opened and closed by a drain plug drive unit (not shown).

Although not shown, the water heater 6 includes a gas burner, a hot water heat exchanger, and a bath heat exchanger. A gas supply pipe 78 is connected to the gas burner. The hot water supply heat exchanger is connected to a water supply pipe 63 for supplying clean water from a water supply source and a hot water supply pipe 66 for supplying hot water water heated from the water heater 6 to the hot water tap 65 and the cleaning unit 4. .. The bath heat exchanger is connected to an outgoing pipe 61 for supplying heated hot water to the circulation metal fitting 5 and a return pipe 62 for returning hot water from the circulation metal fitting 5. Further, in the water heater 6, the return pipe 62 is connected to a hot water filling bypass pipe branching from the hot water supply pipe 66, and the hot water filling bypass pipe is connected to a hot water pouring solenoid valve capable of blocking the supply of hot water. A hot water mixing section equipped with a hot water amount sensor for adjusting the flow rate of hot water is provided. In the present embodiment, the water heater 6 uses a gas water heater, but an electric water heater or a heat pump water heater may be used.

The hot water supply pipe 66 is branched into a hot water supply plug 65 side and a cleaning unit 4 side, and the hot water supply pipe 66a on the upstream side branching to the cleaning unit 4 side is provided with a water replenishment solenoid valve 46 and a water replenishing solenoid valve 46 in this order from the upstream side. A backflow prevention unit 47 that utilizes the spout space is provided, and the hot water supply pipe 66b on the downstream side of the backflow prevention unit 47 has a pump 48, a downstream solenoid valve 49, a check valve 50, and a venturi type. A detergent mixing section 51 is provided. The detergent mixing section 51 and the cleaning nozzle 7 provided in the bathtub 1 are connected by a cleaning pipe 43.

The backflow prevention unit 47 includes a tank 470 that stores a certain amount of hot water supplied from the hot water supply pipe 66a on the upstream side. The upper part of the tank 470 is provided with a refill port 471 for discharging hot water supplied from the hot water supply pipe 66a on the upstream side and an overflow port 473 located below the refill port 471, and the bottom of the tank 470. Is provided with an outlet 472 that supplies hot water from the inside of the tank 470 to the pump 48 via the hot water supply pipe 66b on the downstream side. Therefore, in the backflow prevention unit 47, a spout space is formed between the water replenishment port 471 and the overflow port 473.

High and low water level electrodes 474 and 475 having different lengths for detecting the amount of hot water stored are inserted in the tank 470. The high water level electrode 474 is arranged so that the liquid level is located below the overflow port 473 when hot water is stored in the tank 470. Therefore, when the water replenishment solenoid valve 46 is opened and the hot water is discharged from the water replenishment port 471 into the tank 470, the hot water is stored up to the water level detected by the high water level electrode 474. Further, when the detection failure of the water level electrodes 474 and 475 occurs, or when hot water flows back from the hot water supply pipe 66b on the downstream side due to the valve failure of the downstream solenoid valve 49 and the check valve 50, the high water level electrode 474 However, the liquid level rises to the upper part, but the water level is raised to the water replenishment port 471 because a spout space is formed between the water replenishment port 471 and the overflow port 473 and drainage is performed from the overflow port 473. There is no.

The detergent mixing section 51 connected to the hot water supply pipe 66b on the downstream side of the backflow prevention section 47 is generated by the detergent introduction pipe 44 that guides the detergent from the detergent tank 41 to the detergent mixing section 51, and the detergent mixing section 51. A cleaning pipe 43 that guides the cleaning liquid to the cleaning nozzle 7 is connected, and the detergent introduction pipe 44 is provided with a detergent valve 42 that adjusts the supply of the detergent to the detergent mixing unit 51. Therefore, when the detergent valve 42 is opened and the pump 48 is driven to supply the hot water stored in the tank 470 from the hot water supply pipe 66b on the downstream side to the detergent mixing section 51, the hot water is supplied to the detergent mixing section 51. Due to the negative pressure generated when passing through 51, the detergent and hot water are mixed to generate a cleaning liquid, and the cleaning liquid is ejected from the cleaning nozzle 7 through the cleaning pipe 43 to clean the bathtub 1. Further, when the detergent valve 42 is closed and the pump 48 is similarly driven to supply the hot water stored in the tank 470 to the detergent mixing section 51 from the hot water supply pipe 66b on the downstream side, the hot water is supplied from the cleaning nozzle 7. Only is sprayed to perform pre-cleaning and rinsing of the bathtub 1. In this way, in the case of the Venturi-type detergent mixing section 51, since only the amount of cleaning liquid required for cleaning can be generated, there is little waste of detergent, but instead of the Venturi-type detergent mixing section 51, the detergent introduction pipe 44 is installed in the tank 470. The detergent valve 42 may be connected to the detergent valve 42, and the backflow prevention unit 47 and the detergent mixing unit 51 may be combined.

Although not shown, a bath remote controller 10a, a source gas solenoid valve, a proportional valve, a hot water pouring solenoid valve, a water supply sensor, a hot water amount sensor, and the like are connected to the hot water supply control circuit 8 via electrical wiring. Further, the cleaning control circuit 9 is connected to a cleaning remote controller 10b, a detergent valve 42, a water replenishing solenoid valve 46, a pump 48, a downstream solenoid valve 49, water level electrodes 474,475, a drain plug drive unit, and the like.

Next, the cleaning operation in the bathtub cleaning system of the first embodiment will be described. The water heater 6 ignites the gas burner when the amount of water detected by the water supply sensor (not shown) provided in the water supply pipe 63 exceeds the predetermined amount of water, and when the amount of water detected by the water supply sensor becomes less than the predetermined amount of water. It is configured to perform point fire extinguishing control to extinguish the gas burner.

For example, when the user turns on the cleaning switch (not shown) of the cleaning remote controller 10b after using the bathtub 1, the drain plug 2 is opened and the bathtub water in the bathtub 1 is drained. When a predetermined drainage time elapses after the drain plug 2 is opened, the cleaning control circuit 9 opens the water replenishment solenoid valve 46. Then, clean water is supplied from the water supply pipe 63 to the water heater 6 by the water supply pressure, and when a water supply sensor (not shown) detects a water amount exceeding a predetermined amount, the hot water supply control circuit 8 ignites the gas burner and starts the hot water supply operation. Then, hot water having a predetermined temperature for cleaning is discharged from the hot water supply pipe 66. As a result, the hot water supplied from the hot water supply pipe 66a on the upstream side is stored in the tank 470.

Next, when the accumulation of hot water up to the high water level electrode 474 is detected, the refilling solenoid valve 46 is closed, the downstream solenoid valve 49 is opened, the pump 48 is driven, and the cleaning nozzle 7 is used to drive the bathtub. A preliminary cleaning step of injecting only hot water into 1 is executed. When the water level drop to the low water level electrode 475 is detected during the pre-cleaning step, the water replenishment solenoid valve 46 is opened again to replenish the water to the high water level electrode 474.

When the predetermined pre-cleaning time elapses, the pump 48 is stopped and the downstream solenoid valve 49 is closed. When the predetermined pre-cleaning standby time elapses, the pump 48 is driven and the downstream solenoid valve 49 and the detergent are operated. The valve 42 is opened. As a result, the detergent and hot water are supplied to the detergent mixing unit 51 to generate a cleaning liquid, and a cleaning step of injecting the cleaning liquid from the cleaning nozzle 7 into the bathtub 1 is executed. Also in this step, when the water level drop to the low water level electrode 475 is detected, the water replenishment solenoid valve 46 is opened to replenish the water up to the high water level electrode 474.

When the predetermined cleaning time elapses, the pump 48 is stopped and the downstream solenoid valve 49 and the detergent valve 42 are closed. When the predetermined cleaning standby time elapses, the pump 48 is driven and the downstream solenoid valve 49 is operated. The valve is opened and the rinsing process is performed in the same manner as the pre-cleaning. The opening / closing operation of the water replenishing solenoid valve 46 is also performed in the same manner as in the preliminary cleaning step. The cleaning and rinsing steps may be executed a plurality of times, respectively, or only the cleaning and rinsing steps may be executed without performing the preliminary cleaning.

When the predetermined rinsing time has elapsed, the pump 48 is stopped, the downstream solenoid valve 49 is opened for a predetermined time, the hot water in the tank 470 is drained into the bathtub 1, and then the downstream solenoid valve 49 is closed. Let it valve and end the cleaning operation. The tank 470 may be provided with a drain pipe and a drain valve, and after the rinsing time has elapsed, the drain valve may be opened to drain the water in the tank 470.

As described above, in the bathtub cleaning system of the first embodiment, since the backflow prevention unit 47 having the tank 470 in which the water discharge port space is formed between the water supply port 471 and the overflow port 473 is provided, the water supply port 471 The hot water supply pipe 66a on the upstream side connected to the tank 470 can be cut off from the hot water stored in the tank 470. As a result, even if the detergent flows back to the upstream side of the detergent mixing portion 51 and the detergent is mixed in the tank 470, it is possible to reliably prevent the detergent from being mixed in the clean water. Further, even if the dirty bath water flows back into the tank 470, contamination of the clean water can be reliably prevented.

Further, although the backflow prevention unit 47 cuts off the edge of the hot water supply pipe 66a on the upstream side and the hot water supply pipe 66b on the downstream side, a pump 48 is provided between the backflow prevention unit 47 and the cleaning nozzle 7. Therefore, even in a low water pressure area where the water supply pressure is low, the cleaning liquid and hot water for rinsing can be supplied to the cleaning nozzle 7 at a predetermined injection flow rate.

FIG. 2 is a schematic configuration diagram showing an example of the bathtub cleaning system according to the second embodiment. This bathtub cleaning system includes a bathtub 1a provided with only a drain plug 2 and a cleaning nozzle 7, a cleaning unit 4a, and a water heater 6a for supplying hot water to the cleaning unit 4a during hot water filling and hot water supply operation and cleaning operation. And a cleaning remote control 10c equipped with a hot water filling switch (not shown). The same configuration as that of the first embodiment will be described by using the same reference number.

Unlike the water heater 6 of the first embodiment, the water heater 6a of the second embodiment does not have a temperature changing function and has a configuration of supplying hot water of a constant high temperature such as 60 ° C. or 80 ° C. The cleaning unit 4a includes a hot water mixing unit 80 that mixes hot water supplied from the water heater 6a with water supplied from the clean water side to generate hot water having a predetermined temperature. Therefore, only the water supply pipe 63 for supplying clean water from the water supply source, the hot water supply pipe 66 for supplying the heated hot water to the hot water tap 65 and the cleaning unit 4a, and the gas supply pipe 78 are connected to the water heater 6a. The forward pipe and the return pipe for supplying hot water to the bath 1a are not connected. Also in this embodiment, the water heater 6a is not limited to the gas water heater, and an electric water heater or a heat pump water heater may be used.

Between the backflow prevention unit 47 and the water heater 6a in the cleaning unit 4a, the first hot water supply pipe 66a on the upstream side branching from the hot water supply pipe 66 and the temperature control water supply pipe 63a branching from the water supply pipe 63 are opposite to each other. The hot water mixing section 80 connected via the check valves 86 and 87 is arranged. More specifically, the hot and cold water mixing unit 80 includes a hot water amount adjusting valve 81 provided in the first hot water supply pipe 66a on the upstream side and a water amount adjusting valve 82 provided in the temperature control water supply pipe 63a. The second hot water supply pipe 66c on the upstream side is formed by merging the downstream ends of the above, and a temperature sensor 83 for detecting the temperature of the hot water mixed in the second hot water supply pipe 66c is provided.

The second hot water supply pipe 66c on the upstream side is connected to the backflow prevention unit 47 via the water replenishment solenoid valve 46. Further, the hot water supply pipe 66d for hot water filling is branched from the second hot water supply pipe 66c on the upstream side connecting the hot water mixing unit 80 and the backflow prevention unit 47, and the hot water supply pipe 66d for hot water filling is the hot water. The discharge port is connected to the stile faucet 85 located above the upper surface of the bathtub 1a via the tensioning solenoid valve 90. Therefore, in this bathtub cleaning system, the flow path switching portion is composed of the water replenishment solenoid valve 46 and the hot water filling solenoid valve 90.

Next, the cleaning operation in the bathtub cleaning system of the second embodiment will be described. Similar to the first embodiment, when the cleaning switch (not shown) is turned on by the cleaning remote controller 10c, the drain plug 2 is opened, and after a predetermined time elapses, the hot water mixing unit 80 is provided only on the cleaning unit 4a side. Only the refilling solenoid valve 46 is opened so that hot water is supplied from the water. Then, the gas burner of the water heater 6a is ignited to start the hot water supply operation. When the hot water supply operation is started, the hot water mixing unit 80 adjusts the opening degree of the hot water amount adjusting valve 81 and the water amount adjusting valve 82 so that the temperature of the hot water water detected by the temperature sensor 83 becomes a predetermined temperature, and the opening side of the hot water amount adjusting valve 82 is adjusted. Hot water adjusted to a predetermined temperature is supplied to the tank 470 via the temperature control water supply pipes 63a and the first and second hot water supply pipes 66a and 66c. The operation after the hot water is supplied to the tank 470 is the same as that of the first embodiment.

Next, the hot water filling operation in the bathtub cleaning system of the second embodiment will be described. When the hot water filling operation is executed, when the hot water filling switch (not shown) of the cleaning remote controller 10c is turned on, the drain plug 2 is closed and hot water is discharged from the hot water mixing unit 80 only to the stile faucet 85 side. Only the hot water filling solenoid valve 90 is opened so as to be supplied. Then, in the same manner as described above, the hot water supply operation is started by the water heater 6a, and the hot water amount adjusting valve 81 and the water amount adjusting valve so that the temperature of the hot water water detected by the temperature sensor 83 becomes a predetermined temperature in the hot water mixing unit 80. The opening degree of 82 is adjusted, and hot water is supplied from the hot water supply pipe 66d for filling water to the stile faucet 85. Therefore, according to the bathtub cleaning system of the second embodiment, the temperature of the cleaning liquid or hot water supplied from the cleaning nozzle 7 or the stile faucet 85 into the bathtub 1a can be appropriately changed, so that the bathtub cleaning system has a function of changing the temperature of the hot water. A bathtub cleaning system having a hot water filling function and a bathtub cleaning function can be constructed even if a non-water heater 6a is used. Further, since a large amount of hot water for filling water can be supplied to the bathtub 1a by the water supply pressure, it is not necessary to separately provide a pump having a large capacity.

Further, since the hot water supply pipe 66d for filling the hot water is branched from the second hot water supply pipe 66c on the upstream side which is cut off from the hot water stored in the tank 470, detergent and dirty bathtub water are supplied to the tank 470. Even if it flows backward, detergent and bathtub water will not be mixed in the hot water supplied to the hot water supply pipe 66d for filling.

Further, since the discharge port of the stile faucet 85 is located above the upper surface of the bathtub 1a and a water discharge port space is formed between the discharge port and the hot water in the bathtub 1a, the hot water supply pipe for hot water filling The 66d can be reliably cut off from the bathtub 1a. As a result, backflow from the stile faucet 85 due to dirty bath water can be prevented.

FIG. 3 is a schematic configuration diagram showing an example of the bathtub cleaning system according to the third embodiment. This bathtub cleaning system includes a bathtub 1, a cleaning unit 4b, a water heater 6a for supplying hot water to the cleaning unit 4b during hot water filling and hot water supply operations, and a cleaning operation, and a cleaning remote control 10c. The same configuration as that of the first or second embodiment will be described by using the same reference number.

Similar to the cleaning unit 4a of the second embodiment, the cleaning unit 4b in the third embodiment is provided with a hot water mixing unit 80 on the upstream side of the backflow prevention unit 47, while branching from the second hot water supply pipe 66c on the upstream side. It is not provided with a hot water supply pipe for filling hot water, and is provided with a switching solenoid valve 91 which is a flow path switching unit between the backflow prevention unit 47 and the detergent mixing unit 51. More specifically, the switching solenoid valve 91 is composed of a three-way valve, the downstream hot water supply pipe 66b is connected to the input side, and the downstream third hot water supply pipe is connected to the detergent mixing portion 51 on the output side. The 66e and the hot water supply pipe 66f for filling water connected to the circulation fitting 5 are connected, and the hot water sent from the pump 48 is switched between the detergent mixing portion 51 side and the circulation fitting 5 side.

Next, the cleaning operation in the bathtub cleaning system of the third embodiment will be described. Similar to the first embodiment, when the cleaning switch (not shown) is turned on by the cleaning remote controller 10c, the drain plug 2 is opened, and after a predetermined time elapses, hot water is supplied only to the detergent mixing portion 51 side. The flow path of the switching solenoid valve 91 is switched so as to be performed, and the water replenishing solenoid valve 46 is opened. Then, the gas burner of the water heater 6a is ignited to start the hot water supply operation. When the hot water supply operation is started, the opening degree of the hot water amount adjusting valve 81 and the water amount adjusting valve 82 is adjusted in the hot water mixing unit 80 so that the temperature of the hot water water detected by the temperature sensor 83 becomes a predetermined temperature, and the upstream side. Hot water adjusted to a predetermined temperature is supplied to the tank 470 via the temperature control water supply pipes 63a and the first and second hot water supply pipes 66a and 66c. The operation after the hot water is supplied to the tank 470 is the same as that of the first embodiment.

Next, the hot water filling operation in the bathtub cleaning system of the third embodiment will be described. When executing the hot water filling operation, when the hot water filling switch (not shown) of the cleaning remote controller 10c is turned on, the drain plug 2 is closed and the hot water is switched so as to be supplied only to the circulation metal fitting 5 side. The flow path of the solenoid valve 91 is switched to open the water replenishment solenoid valve 46. Then, in the same manner as described above, the hot water supply operation is started by the water heater 6a, and the hot water amount adjusting valve 81 and the water amount adjusting valve so that the temperature of the hot water water detected by the temperature sensor 83 in the hot water mixing unit 80 becomes a predetermined temperature. The opening degree of 82 is adjusted, and hot water is supplied to the circulation metal fitting 5 from the hot water supply pipe 66f for filling hot water. Therefore, according to the bathtub cleaning system of the third embodiment, the temperature of the cleaning liquid and the hot water supplied from the cleaning nozzle 7 and the circulation metal fitting 5 into the bathtub 1 can be appropriately changed, so that the bathtub cleaning system does not have a function of changing the temperature of the hot water. Even if the water heater 6a is used, a bathtub cleaning system having a hot water filling function and a bathtub cleaning function can be constructed. Further, since the hot water in the hot water filling operation is supplied by the pump 48, it is not affected by the water supply pressure and can be filled at a higher speed than the hot water filling by the water supply pressure in the low water pressure area.

FIG. 4 is a schematic configuration diagram showing an example of the bathtub cleaning system according to the fourth embodiment. This bathtub cleaning system includes a bathtub 1, a cleaning unit 4c, a water heater 6a for supplying hot water to the cleaning unit 4c during hot water filling and hot water supply operations, and a cleaning operation, and a cleaning remote control 10c. The same configuration as that of the first or second embodiment will be described by using the same reference number.

Similar to the cleaning unit 4a of the second embodiment, the cleaning unit 4c according to the fourth embodiment includes a hot water mixing unit 80 on the upstream side of the backflow prevention unit 47, and includes the hot water mixing unit 80 and the circulation fitting 5. A second backflow prevention unit 95 is provided in the hot water supply pipe 66d for filling water that branches from the second hot water supply pipe 66c on the upstream side to be connected. More specifically, the second check valve 95 includes a hot water amount sensor 96, a hot water on-off valve 97, a check valve 98, and an atmospheric release valve 99.

The cleaning operation and the hot water filling operation in the bathtub cleaning system of the fourth embodiment are the same as those of the second embodiment. According to the bathtub cleaning system of the fourth embodiment, in addition to the action and effect of the bathtub cleaning system of the second embodiment, the second backflow prevention unit 95 is provided in the hot water supply pipe 66d for filling the bathtub. Even if the circulation metal fitting 5 is provided in the bathtub, the backflow of bathtub water can be reliably prevented.

FIG. 5 is a schematic configuration diagram showing an example of the bathtub cleaning system according to the fifth embodiment. This bathtub cleaning system includes a bathtub 1b having only a drain plug 2, a cleaning unit 4a, a water heater 6a for supplying hot water to the cleaning unit 4a during hot water filling and hot water supply operation, and a cleaning remote control 10c. To be equipped. The same configuration as that of the first or second embodiment will be described by using the same reference number.

The bathtub 1b in the fifth embodiment is not provided with the cleaning nozzle 7, and the cleaning pipe 43 is connected to the cleaning nozzle 7a above the upper surface of the bathtub 1b. More specifically, the cleaning nozzle 7a is located above the upper surface of the bathtub 1b and is provided so that a spout space is formed between the cleaning nozzle 7a and the bathtub water. As a result, the backflow prevention means using the spout space is provided even at the downstream end where the cleaning liquid is sprayed, so that the backflow of detergent and bath water can be prevented more reliably.

1,1a, 1b Bathtub 2 Drain plug 6,6a Water heater 41 Detergent tank 43 Cleaning pipe 7,7a Cleaning nozzle 47 Backflow prevention part 470 Tank 471 Water replenishment port 472 Outlet 473 Overflow port 48 Pump 51 Detergent mixing part

Claims (1)

A water heater that heats clean water to generate hot water,
With a bathtub
A detergent tank for storing detergent and
A detergent mixing part that mixes the detergent supplied from the detergent tank and the hot water supplied from the water heater to generate a cleaning liquid,
A cleaning nozzle that sprays cleaning liquid into the bathtub,
A cleaning pipe that connects the detergent mixing part and the cleaning nozzle,
A hot water supply pipe that guides hot water from the water heater to the detergent mixing section,
Backflow prevention means provided between the detergent mixing section and the water heater,
A pump provided between the cleaning nozzle and the backflow prevention means to inject the cleaning liquid from the cleaning nozzle,
A hot water mixing section that is provided between the backflow prevention means and the water heater and mixes the hot water supplied from the water heater and the water supplied from the clean water side.
A hot water supply pipe for hot water filling that branches from the hot water supply pipe on the upstream side that connects the backflow prevention means and the hot water mixing part, and is connected to the hot water tap.
In the hot water mixing section, the hot water supply pipe on the upstream side is provided by the solenoid valve for replenishment water provided on the downstream side of the branch of the hot water supply pipe for hot water filling and the on-off valve provided on the hot water supply pipe for hot water filling. It is equipped with a flow path switching unit that switches the mixed hot water to the backflow prevention means side or the hot water tap side .
Detergent mixing section, backflow preventing means, a pump, a tub cleaning system that having a cleaning unit comprising hot and cold water mixing unit, and the flow path switching unit,
The backflow prevention means is connected to the hot water supply pipe on the upstream side and discharges the hot water supplied from the water heater, the overflow port located below the water supply port, and the overflow port located below the overflow port and downstream. A bathtub cleaning system that has a tank that is connected to the hot water supply pipe on the side and has an outlet that allows hot water to flow out, and has a structure that forms a spout space between the refill port and the overflow port to prevent backflow.

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