JP2018023471A - Bathtub washing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent backflow of a detergent to a clean water side in a sure manner.SOLUTION: A bathtub washing system includes a water heater 6 for heating clean water and generating hot water, a bathtub 1, a detergent tank 41, a detergent mixing part 51 for mixing a detergent supplied from the detergent tank 41 with the hot water supplied from the water heater 6, a washing nozzle 7 for injecting washing liquid to the bathtub 1, a pump 48 for injecting the washing liquid from the washing nozzle 7, and a washing pipe 43 for connecting the detergent mixing part 51 and the washing nozzle 7. A tank having a refilling port 471, an overflow port 473, and an outflow port 472 is provided between the detergent mixing part 51 and the water heater 6. A water discharge port space is formed between the refilling port 471 and the overflow port 473, and backflow prevention means 47 for preventing backflow is provided.SELECTED DRAWING: Figure 1

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.

  2. Description of the Related Art Conventionally, there is known a bathtub cleaning system having a bathtub cleaning function in which cleaning liquid is sprayed into a bathtub to wash away dirt adhering to the inner wall surface of the bathtub. In this type of bathtub cleaning system, for example, hot water heated with hot water heater and detergent are mixed in a detergent mixing unit to generate a cleaning liquid, and the cleaning liquid is supplied to the cleaning nozzle. Therefore, when the cleaning liquid flows backward through the hot water supply pipe that supplies hot water from the water heater to the detergent mixing section, there is a possibility that the clean water is contaminated. For this reason, it has been proposed to provide a check valve in the hot water supply pipe upstream of the detergent mixing unit for mixing hot water and detergent (for example, Patent Documents 1 and 2).

JP 2003-61850 A Japanese Patent Laid-Open No. 11-299671

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

  This invention solves the said subject, and the objective of this invention is preventing the reverse flow of the detergent to a clean water side reliably in a bathtub washing system.

According to the present invention,
A water heater that heats the water to produce hot water;
A bathtub,
A detergent tank for storing detergent;
A detergent mixing section that mixes the detergent supplied from the detergent tank with hot water supplied from the water heater to generate a cleaning liquid;
A cleaning nozzle for injecting cleaning liquid into the bathtub;
A cleaning tube connecting the detergent mixing section and the cleaning nozzle;
A hot water supply pipe for guiding 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 bath cleaning system provided between the cleaning nozzle and the backflow prevention means, and a pump for injecting the cleaning liquid from the cleaning nozzle,
The backflow prevention means is connected to the upstream hot water supply pipe, and is a replenishing port for discharging hot water supplied from the water heater, an overflow port located below the refilling port, and a position below the overflow port, and downstream A bathtub cleaning system is provided that includes a tank that is connected to a hot water supply pipe on the side and has an outlet that flows out hot water, and that has a structure that forms a water discharge port space between the water replenishing port and the overflow port to prevent backflow. The

  According to the bathtub cleaning system, the backflow prevention means using the spout space is provided between the detergent mixing unit for mixing the detergent and hot water, and the water heater to which clean water is supplied. Even when a large amount of backflow occurs in the stored tank, the liquid level does not rise above the overflow port, so the detergent enters the water replenishment port located above the overflow port via the water outlet space. Without mixing, detergent can be reliably prevented 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, even if the hot water supply pipe connected to the water heater is cut off by the backflow prevention means using the spout space, the hot water is backflowed. The prevention means can smoothly supply the cleaning nozzle. For this reason, even in a low water pressure region where the feed water pressure is low, the cleaning liquid and rinsing hot water can be supplied to the bathtub at a predetermined injection flow rate.

Preferably, the bathtub cleaning system further includes:
A hot water mixing section provided between the backflow prevention means and the hot water heater, for mixing hot water supplied from the water heater and water supplied from the water supply side;
A hot water supply pipe for hot water filling branched from an upstream hot water supply pipe connecting the backflow prevention means and the hot water mixing section, and connected to a hot water tap whose discharge port is located above the upper surface of the bathtub,
A flow path switching unit that switches hot water mixed in the hot water mixing unit to the backflow prevention means side or the hot water tap side.

  According to the bathtub cleaning system, the hot water mixing unit for mixing hot water supplied from the hot water heater and water supplied from the upper water side is provided between the backflow prevention means and the hot water heater. Even a water heater without a change function can supply hot water of a predetermined temperature. For this reason, a hot water filling function and a bathtub washing function can be provided. In addition, the hot water supply pipe for supplying hot water to the bathtub is connected to a hot water tap located above the upper surface of the bathtub so that the reverse flow to the upstream side of the bathtub water is ensured. Can be prevented.

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

FIG. 1 is a schematic configuration diagram of a bathtub cleaning system according to Embodiment 1 of the present invention. FIG. 2 is a schematic configuration diagram of a bathtub cleaning system according to Embodiment 2 of the present invention. FIG. 3 is a schematic configuration diagram of a bathtub cleaning system according to Embodiment 3 of the present invention. FIG. 4 is a schematic configuration diagram of a bathtub cleaning system according to Embodiment 4 of the present invention. FIG. 5 is a schematic configuration diagram of a bathtub cleaning system according to Embodiment 5 of the present invention.

  1 is a schematic configuration diagram illustrating an example of a bathtub cleaning system according to Embodiment 1. FIG. This bathtub cleaning system includes a bathtub 1, a cleaning unit 4 for automatically cleaning the bathtub 1, a hot water filling, reheating and hot water supply operation, and a hot water heater 6 for supplying hot water to the cleaning unit 4 during the cleaning operation. The bath remote controller 10a and the cleaning remote controller 10b are provided.

  The bottom of the bathtub 1 is provided with a drain plug 2 for draining the bathtub water and a cleaning nozzle 7 for injecting the cleaning liquid. On the inner wall side surface of the bathtub 1, hot water for hot water filling or chasing Is provided with a circulating metal fitting (hot water adapter) 5. The drain plug 2 is configured to be opened and closed by a drain plug driving 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. Connected to the hot water supply heat exchanger are 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 heated from the water heater 6 to the hot water tap 65 and the cleaning unit 4. . Connected to the bath heat exchanger are an outgoing pipe 61 that supplies hot water to the circulation fitting 5 and a return pipe 62 that returns hot water from the circulation fitting 5. In the hot water heater 6, the return pipe 62 is connected to a hot water bypass pipe branched from the hot water supply pipe 66. The hot water supply bypass pipe includes a hot water solenoid valve that can shut off the supply of hot water, A hot and cold water mixing unit having a hot water amount sensor for adjusting the flow rate of hot water is provided. In the present embodiment, a gas water heater is used as the water heater 6, but an electric water heater or a heat pump water heater may be used.

  The hot water supply pipe 66 is branched to the hot water tap 65 side and the 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 an electromagnetic valve 46 for replenishing water in order from the upstream side, and A backflow prevention unit 47 that uses the spout space is provided, and a hot water supply pipe 66b downstream of the backflow prevention unit 47 includes a pump 48, a downstream solenoid valve 49, a check valve 50, and a venturi type. A detergent mixing unit 51 is provided. The detergent mixing unit 51 and the cleaning nozzle 7 provided in the bathtub 1 are connected by a cleaning tube 43.

  The backflow prevention unit 47 includes a tank 470 that stores a certain amount of hot water supplied from the upstream hot water supply pipe 66a. An upper part of the tank 470 is provided with a water replenishing port 471 through which hot water supplied from the upstream hot water supply pipe 66 a is discharged, and an overflow port 473 located below the water replenishing port 471. Is provided with an outlet 472 for supplying hot water from 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 water discharge space is formed between the water replenishing port 471 and the overflow port 473.

  High and low water level electrodes 474 and 475 having different lengths for detecting the amount of stored hot water are inserted in the tank 470. The high water level electrode 474 is disposed 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 replenishing electromagnetic valve 46 is opened and hot water is discharged into the tank 470 from the water replenishing port 471, the hot water is stored up to the water level detected by the high water level electrode 474. In addition, when detection failure of the water level electrodes 474 and 475 occurs, or when hot water flows back from the downstream hot water supply pipe 66b due to valve failure of the downstream solenoid valve 49 and the check valve 50, the high water level electrode 474 Although the liquid level rises to the upper side, a water discharge port space is formed between the water replenishing port 471 and the overflow port 473, and the liquid level rises to the water replenishing port 471 because the water is discharged from the overflow port 473. There is no.

  The detergent mixing unit 51 connected to the hot water supply pipe 66b on the downstream side of the backflow prevention unit 47 is generated by the detergent introduction tube 44 that guides the detergent from the detergent tank 41 to the detergent mixing unit 51 and the detergent mixing unit 51. The 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 detergent to the detergent mixing section 51. Therefore, when hot water stored in the tank 470 is supplied from the downstream hot water supply pipe 66b to the detergent mixing unit 51 in a state where the detergent valve 42 is opened, hot water is supplied to the detergent mixing unit 51. The detergent and hot water are mixed by the negative pressure generated when passing through 51 to generate a cleaning liquid. The cleaning liquid is jetted from the cleaning nozzle 7 through the cleaning pipe 43, and the bathtub 1 is cleaned. In the state where the detergent valve 42 is closed, when the pump 48 is similarly driven and hot water stored in the tank 470 is supplied to the detergent mixing unit 51 from the hot water supply pipe 66b on the downstream side, hot water is supplied from the cleaning nozzle 7. Only the tub 1 is pre-cleaned and rinsed. In this way, in the case of the venturi-type detergent mixing unit 51, since only the amount of cleaning liquid necessary for cleaning can be generated, there is little waste of detergent, but instead of the venturi-type detergent mixing unit 51, the detergent introduction pipe 44 is installed in the tank 470. The detergent valve 42 may be connected to serve as the backflow prevention unit 47 and the detergent mixing unit 51.

  Although not shown, the hot water supply control circuit 8 is connected to a bath remote controller 10a, an original gas electromagnetic valve, a proportional valve, a hot water electromagnetic valve, a water supply sensor, a hot water amount sensor, and the like via electric wiring. The cleaning control circuit 9 is connected to a cleaning remote controller 10b, a detergent valve 42, a water replenishing electromagnetic valve 46, a pump 48, a downstream electromagnetic valve 49, water level electrodes 474 and 475, a drain plug driving unit, and the like.

  Next, the cleaning operation in the bathtub cleaning system of Embodiment 1 will be described. The water heater 6 ignites the gas burner when the amount of water detected by a water supply sensor (not shown) provided in the water supply pipe 63 becomes equal to or greater than a 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 comprised so that the point fire extinguishing control which extinguishes a gas burner may be performed.

  For example, when the user turns on a 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 has elapsed since the drain plug 2 was opened, the cleaning control circuit 9 opens the water replenishing electromagnetic valve 46. Then, when hot water is supplied from the water supply pipe 63 to the water heater 6 by the water supply pressure, and a water amount of a predetermined amount or more is detected by a water supply sensor (not shown), the hot water supply control circuit 8 ignites the gas burner and starts the hot water supply operation. Then, hot water at a predetermined temperature for washing is discharged from the hot water supply pipe 66. Thereby, the hot water supplied from the upstream hot water supply pipe 66 a is stored in the tank 470.

  Next, when the storage of hot water up to the high water level electrode 474 is detected, the water replenishing electromagnetic valve 46 is closed, the downstream electromagnetic valve 49 is opened, the pump 48 is driven, and the bathtub from the washing nozzle 7 is driven. A pre-cleaning step of injecting only hot water into 1 is performed. When a decrease in the water level up to the low water level electrode 475 is detected during the preliminary cleaning process, the water replenishing electromagnetic valve 46 is opened again to replenish water up to the high water level electrode 474.

  When the predetermined preliminary cleaning time has elapsed, the pump 48 is stopped and the downstream electromagnetic valve 49 is closed. When the predetermined preliminary cleaning standby time has elapsed, the pump 48 is driven, and the downstream electromagnetic valve 49 and the detergent are driven. The valve 42 is opened. As a result, the detergent and hot water are supplied to the detergent mixing unit 51 to generate the cleaning liquid, and the cleaning process 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 up to the low water level electrode 475 is detected, the water replenishing electromagnetic valve 46 is opened, and water up to the high water level electrode 474 is performed.

  When the predetermined cleaning time elapses, the pump 48 is stopped and the downstream electromagnetic valve 49 and the detergent valve 42 are closed. When the predetermined cleaning standby time elapses, the pump 48 is driven and the downstream electromagnetic valve 49 is driven. The rinsing step is performed in the same manner as the pre-cleaning. The opening / closing operation of the water replenishing electromagnetic valve 46 is also performed in the same manner as the preliminary cleaning step. Each of the cleaning and rinsing steps may be executed a plurality of times, or only the cleaning and rinsing steps may be executed without performing 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 the downstream solenoid valve 49 is then closed. Let the valve run and finish the cleaning operation. Note that a drain pipe and a drain valve may be provided in the tank 470, 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 Embodiment 1, 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 hot-water supply pipe 66a on the upstream side connected to can be cut off from the hot-water stored in the tank 470. Thereby, even if the detergent flows backward upstream of the detergent mixing unit 51 and the detergent is mixed into the tank 470, it is possible to reliably prevent the detergent from being mixed into the clean water. Moreover, even if the dirty bathtub water flows back into the tank 470, contamination of the clean water can be reliably prevented.

  Further, the upstream hot water supply pipe 66 a and the downstream hot water supply pipe 66 b are separated by the backflow prevention unit 47, but a pump 48 is provided between the backflow prevention unit 47 and the cleaning nozzle 7. Thus, even in a low water pressure region where the feed water pressure is low, the cleaning liquid and rinsing hot water can be supplied to the cleaning nozzle 7 at a predetermined injection flow rate.

  FIG. 2 is a schematic configuration diagram illustrating an example of a 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, a hot water filling and hot water supply operation, and a hot water heater 6a for supplying hot water to the cleaning unit 4a during the cleaning operation. And a cleaning remote controller 10c provided with a hot water filling switch (not shown). In addition, about the structure same as Embodiment 1, it abbreviate | omits description using the same reference number.

  Unlike the water heater 6 in the first embodiment, the water heater 6a in the second embodiment does not have a temperature changing function and has a configuration for supplying hot water of a constant high temperature such as 60 ° C. or 80 ° C. The washing unit 4a includes a hot and cold mixing unit 80 that mixes hot water supplied from the water heater 6a and water supplied from the upper water side to generate hot water at 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 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 bathtub 1a are not connected. Also in this embodiment, the water heater 6a is not limited to the gas type water heater, and an electric water heater or a heat pump type water heater may be used.

  Between the backflow prevention unit 47 and the water heater 6a in the cleaning unit 4a, the upstream first hot water supply pipe 66a branched from the hot water supply pipe 66 and the temperature adjustment water supply pipe 63a branched from the water supply pipe 63 are respectively reversed. A hot and cold water mixing section 80 connected via stop valves 86 and 87 is provided. More specifically, the hot and cold mixing unit 80 includes a hot water amount adjustment valve 81 provided in the upstream first hot water supply pipe 66a and a water amount adjustment valve 82 provided in the temperature adjustment water supply pipe 63a. The downstream ends of the second hot water supply pipe 66c are combined to form a second hot water supply pipe 66c on the upstream side, and a temperature sensor 83 that detects the temperature of the hot water mixed in the second hot water supply pipe 66c is provided.

  The second hot water supply pipe 66 c on the upstream side is connected to the backflow prevention unit 47 via the water replenishing electromagnetic valve 46. A hot water supply pipe 66d for hot water is branched from the second hot water supply pipe 66c on the upstream side connecting the hot water mixing section 80 and the backflow prevention section 47, and the hot water supply pipe 66d for hot water is connected to the hot water supply pipe 66d. Via the electromagnetic valve 90 for tension, the discharge outlet is connected with the water faucet 85 located above the upper surface of the bathtub 1a. Accordingly, in this bathtub cleaning system, the flow path switching unit is configured by the water replenishing solenoid valve 46 and the hot water filling solenoid valve 90.

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

  Next, a hot water filling operation in the bathtub cleaning system of the second embodiment will be described. When performing 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 hot water is supplied from the hot water mixing unit 80 only to the side of the water tap 85. Only the hot water solenoid valve 90 is opened so as to be supplied. Then, similarly to the above, the hot water supply operation is started in the hot water heater 6a, and the hot water amount adjusting valve 81 and the water amount adjusting valve are set so that the temperature of the hot water detected by the temperature sensor 83 in the hot water / water mixing section 80 becomes a predetermined temperature. The opening of 82 is adjusted, and hot water is supplied from the hot water supply pipe 66d for hot water to the tap water tap 85. Therefore, according to the bathtub cleaning system of the second embodiment, since the temperature of the cleaning liquid and hot water supplied from the cleaning nozzle 7 and the water faucet 85 into the bathtub 1a can be changed as appropriate, a temperature changing function for the hot water temperature is provided. Even if there is no hot water heater 6a, a bathtub cleaning system having a hot water filling function and a bathtub cleaning function can be constructed. Moreover, since a large amount of hot water for filling water can be supplied to the bathtub 1a by the supply water pressure, it is not necessary to provide a pump with a large capacity separately.

  Moreover, since the hot water supply pipe 66d for hot water is branched from the second hot water supply pipe 66c on the upstream side which is separated from the hot water stored in the tank 470, detergent or dirty bath water is stored in the tank 470. Even if it flows backward, detergent and bath water are not mixed in the hot water supplied to the hot water supply pipe 66d for hot water filling.

  Further, the discharge port of the water faucet 85 is located above the upper surface of the bathtub 1a, and a spout space is formed between the discharge port and the hot water in the bathtub 1a. 66d can be reliably cut off from the bathtub 1a. Thereby, the backflow from the faucet 85 by dirty bathtub water can also be prevented.

  FIG. 3 is a schematic configuration diagram illustrating an example of a bathtub cleaning system according to the third embodiment. This bathtub cleaning system includes a bathtub 1, a cleaning unit 4b, a hot water filling and hot water supply operation, a hot water heater 6a for supplying hot water to the cleaning unit 4b during the cleaning operation, and a cleaning remote controller 10c. In addition, about the structure same as Embodiment 1 or 2, the description is abbreviate | omitted using the same reference number.

  The cleaning unit 4b according to the third embodiment includes a hot water / water mixing unit 80 on the upstream side of the backflow prevention unit 47, and branches from the second hot water supply pipe 66c on the upstream side, similarly to the cleaning unit 4a of the second embodiment. A hot water supply pipe for hot water filling is not provided, and a switching electromagnetic valve 91 that is a flow path switching unit is provided between the backflow prevention unit 47 and the detergent mixing unit 51. More specifically, the switching solenoid valve 91 is a three-way valve, a downstream hot water supply pipe 66b connected to the input side, and a downstream third hot water supply pipe connected to the detergent mixing unit 51 on the output side. 66e and a hot water supply pipe 66f for hot water filling connected to the circulation fitting 5 are connected, and hot water sent from the pump 48 is switched between the detergent mixing section 51 side and the circulation fitting 5 side.

  Next, the cleaning operation in the bathtub cleaning system of Embodiment 3 will be described. As in the first embodiment, when a cleaning switch (not shown) is turned on by the cleaning remote controller 10c, the drain plug 2 is opened, and hot water is supplied only to the detergent mixing unit 51 side after a predetermined time has elapsed. Thus, the flow path of the switching electromagnetic valve 91 is switched to open the water replenishing electromagnetic valve 46. And the gas burner of the water heater 6a is ignited and the hot water supply operation is started. When the hot water supply operation is started, the hot water amount adjusting valve 81 and the water amount adjusting valve 82 are adjusted so that the temperature of the hot water detected by the temperature sensor 83 becomes a predetermined temperature in the hot water / mixing unit 80, and the upstream side Hot water adjusted to a predetermined temperature is supplied to the tank 470 through the temperature adjustment water supply pipe 63a and the first and second hot water supply pipes 66a and 66c. The operation after hot water is supplied to the tank 470 is the same as that in the first embodiment.

  Next, a hot water filling operation in the bathtub cleaning system of Embodiment 3 will be described. When a hot water filling operation is executed, when a 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 only to the circulating metal fitting 5 side. The flow path of the electromagnetic valve 91 is switched, and the water replenishing electromagnetic valve 46 is opened. Then, similarly to the above, the hot water supply operation is started in the hot water heater 6a, and the hot water amount adjusting valve 81 and the water amount adjusting valve are set so that the temperature of the hot water detected by the temperature sensor 83 in the hot water / water mixing section 80 becomes a predetermined temperature. The opening degree of 82 is adjusted, and hot water is supplied to the circulation fitting 5 from the hot water supply pipe 66f for hot water filling. Therefore, according to the bathtub cleaning system of the third embodiment, since the temperature of the cleaning liquid and hot water supplied from the cleaning nozzle 7 and the circulation fitting 5 into the bathtub 1 can be appropriately changed, the temperature changing function of the hot water temperature is not provided. 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. Moreover, since hot water in the hot water filling operation is supplied by the pump 48, hot water filling can be performed at a higher speed in the low water pressure region than in the hot water filling by the water supply pressure.

  FIG. 4 is a schematic configuration diagram illustrating an example of a bathtub cleaning system according to the fourth embodiment. This bathtub cleaning system includes a bathtub 1, a cleaning unit 4c, a hot water filling and hot water supply operation, a hot water heater 6a for supplying hot water to the cleaning unit 4c during the cleaning operation, and a cleaning remote controller 10c. In addition, about the structure same as Embodiment 1 or 2, the description is abbreviate | omitted using the same reference number.

  As with the cleaning unit 4a of the second embodiment, the cleaning unit 4c in the fourth embodiment includes a hot water mixing unit 80 upstream of the backflow prevention unit 47, and the hot water mixing unit 80 and the circulation fitting 5 are connected to each other. A hot water supply pipe for hot water supply 66d branched from the upstream second hot water supply pipe 66c to be connected is provided with a second backflow prevention unit 95. More specifically, the second backflow prevention unit 95 includes a hot water amount sensor 96, a hot water on / off valve 97, a check valve 98, and an air release valve 99.

  The washing operation and the hot water filling operation in the bathtub washing 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 operational effects 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 hot water filling. Even if the circulating metal fitting 5 is provided, reverse flow of the bath water can be reliably prevented.

  FIG. 5 is a schematic configuration diagram illustrating an example of a 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 hot water filling and hot water supply operation, a hot water heater 6a for supplying hot water to the cleaning unit 4a during the cleaning operation, and a cleaning remote controller 10c. Is provided. In addition, about the structure same as Embodiment 1 or 2, the description is abbreviate | omitted using the same reference number.

  The washing nozzle 7 is not provided in the bathtub 1b in Embodiment 5, and the washing pipe 43 is connected to the washing nozzle 7a above the upper surface of the bathtub 1b. In more detail, the washing nozzle 7a is located above the upper surface of the bathtub 1b, and is provided so that a spout space may be formed between the washing nozzle 7a and the bathtub water. Thereby, since the backflow prevention means using the water outlet space is provided even at the downstream end where the cleaning liquid is jetted, the backflow of the detergent and the bath water can be prevented more reliably.

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

Claims (2)

A water heater that heats the water to produce hot water;
A bathtub,
A detergent tank for storing detergent;
A detergent mixing section that mixes the detergent supplied from the detergent tank with hot water supplied from the water heater to generate a cleaning liquid;
A cleaning nozzle for injecting cleaning liquid into the bathtub;
A cleaning tube connecting the detergent mixing section and the cleaning nozzle;
A hot water supply pipe for guiding 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 bath cleaning system provided between the cleaning nozzle and the backflow prevention means, and a pump for injecting the cleaning liquid from the cleaning nozzle,
The backflow prevention means is connected to the upstream hot water supply pipe, and is a replenishing port for discharging hot water supplied from the water heater, an overflow port located below the refilling port, and a position below the overflow port, and downstream A bathtub cleaning system comprising a tank connected to a hot water supply pipe on the side and having an outlet for discharging hot water, and having a structure for forming a water discharge port space between a water replenishing port and an overflow port to prevent backflow. The bathtub cleaning system according to claim 1 is further provided between the backflow prevention means and the hot water heater, and a hot water mixing unit for mixing hot water supplied from the hot water heater and water supplied from the upper water side,
A hot water supply pipe for hot water filling branched from an upstream hot water supply pipe connecting the backflow prevention means and the hot water mixing section, and connected to a hot water tap whose discharge port is located above the upper surface of the bathtub,
A bathtub cleaning system comprising: a flow path switching unit that switches hot water mixed in the hot water mixing unit to a backflow prevention means side or a hot water tap side.

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