JP2019058224A - Bathtub washing device - Google Patents

Abstract

To provide a bathtub washing device that can prevent an occurrence of scale in a pump, and perform a washing operation stably over a long period of time with fewer pump failures even when a storage container open to the atmosphere, and the pump are arranged above a washing nozzle.SOLUTION: A bathtub washing device includes a storage container 47 open to the air for storing hot water, low water level detection means 472 for detecting a predetermined low water level in the storage container 47, a washing nozzle 7, a detergent tank 41, a detergent mixing part 51 for mixing hot water supplied from the storage container 47 with detergent supplied from the detergent tank 41 and generating washing water, a pump 48 for jetting and stopping the hot water and the washing water from the washing nozzle 7, and an on-off valve 49 provided to a hot water communication pipe 66c. The storage container 47 and the pump 48 are arranged above the washing nozzle 7. On condition that hot water is detected by the low water level detection means 472, the on-off valve 49 is closed, and the washing operation is stopped.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bathtub cleaning apparatus that automatically cleans a bathtub.

  BACKGROUND Conventionally, there has been known a bathtub cleaning device that sprays washing water into a bathtub to wash away dirt attached to the inner wall surface of the bathtub. In this type of bathtub cleaning apparatus, for example, detergent and hot water supplied from a heat source machine are mixed in the detergent mixing unit to generate cleaning water, and cleaning water is sprayed from the cleaning nozzle toward the inside of the bath ( For example, Patent Document 1).

  By the way, while providing the storage container which stores the hot water supplied from a heat source machine in the above-mentioned bathtub cleaning apparatus, a pump is provided in the flow path more downstream than a storage container, detergent mixing of the storage water of a storage container by a pump It is conceivable that the pressure is sent to the part and the washing water is sprayed from the washing nozzle to a predetermined jetting position of the bath.

  However, during the cleaning operation, since the hot water is supplied from the storage container to the detergent nozzle through the pump, the inside of the pump is filled with hot water, for example, the storage container opened to the atmosphere above the cleaning nozzle and When the pump is provided, when the washing operation is finished and the supply of hot and cold water to the storage container is stopped, the hot and cold water flows down and the inside of the pump becomes empty. Therefore, if the full and empty states of hot and cold water are alternately repeated in the pump due to the repetition of the washing operation, scales such as calcium carbonate contained in the clean water are deposited in the pump, causing fluctuations in the pump flow rate and There is a risk of causing a failure such as sticking.

JP 2003-61850 A

  The present invention solves the above-mentioned problems, and an object of the present invention is to prevent the occurrence of scale in the pump even when the storage container and the pump opened to the atmosphere above the cleaning nozzle are disposed, An object of the present invention is to provide a bathtub cleaning apparatus which can perform a stable cleaning operation for a long time with less pump failure.

According to the invention
An open storage container for storing hot and cold water supplied from a heat source machine,
Low water level detection means for detecting a predetermined low water level in the storage container;
A cleaning nozzle provided in the bath,
A detergent tank for storing detergent,
A detergent mixing unit that generates wash water by mixing the hot water supplied from the storage container and the detergent supplied from the detergent tank;
Hot and cold water communication pipes that connect the storage container and the detergent mixing unit,
A washing pipe for supplying hot water and washing water from the detergent mixing section to the washing nozzle;
A pump provided in the hot water communication pipe for injecting and stopping hot water and washing water from the washing nozzle;
An on-off valve for opening and closing the flow path of the hot water communication pipe,
And a washing control unit for performing a washing operation of washing the bath by spraying hot water and washing water into the bath from the washing nozzle.
The reservoir and the pump are disposed above the cleaning nozzle,
Provided is a bathtub cleaning device which closes the on-off valve and terminates the cleaning operation on condition that hot water is detected by the low water level detection means.

  According to the bathtub cleaning apparatus, a low water level detection means for detecting a predetermined low water level in the storage container, and an open / close valve for opening and closing the flow path of the hot water communication pipe downstream of the storage container opened to the atmosphere are provided. Because the on-off valve is closed on the condition that hot water is detected by the low water level detection means and the cleaning operation is ended, one end of the hot water communication pipe is sealed, and the inside of the pump provided in the hot water communication pipe The hot and cold water can be retained.

Preferably, in the bathtub cleaning device,
When the low water level detection means does not detect hot water in the washing operation, the pump is stopped and the on-off valve is closed, and the hot water is supplied to the storage container at least until the low water level detection means detects hot water.

  According to the above-mentioned bathtub cleaning apparatus, when the low water level detection means does not detect hot water during the cleaning operation, the low water level detection means supplies the hot water to the storage container at least until the low water level detection means detects the hot water The end of the cleaning operation can be reliably reached while maintaining the state in which the

Preferably, in the bathtub cleaning device,
The on-off valve is provided in the hot water communication pipe downstream of the pump.

  According to the bathtub cleaning apparatus, the on-off valve is provided on the hot water communication pipe downstream of the pump. For example, the diameter of the hot water communication pipe downstream of the on-off valve is large, and from the cleaning nozzle at the downstream end Even when the air flows in and the hot water tends to fall off, the hot water can be retained in the pump.

Preferably, the bathtub cleaning apparatus further comprises:
High water level detection means for detecting a predetermined high water level in the storage container;
After the cleaning operation is completed, when the low water level detection means does not detect the hot water, the hot water is supplied to the storage container until the high water level detection means detects the hot water.

  Even if the water level is detected by the low water level detection means, if the water level is slightly higher than the low water level detected by the low water level detection means at the end of the washing operation, the so-called Due to the siphon effect, hot and cold water may be drained off in a very short time (for example, about one second).

  However, according to the above-mentioned bathtub cleaning device, even though hot water is detected by the low water level detection means, the hot water is not detected by the low water level detection means after the on-off valve is closed and the washing operation is completed. Since the hot water is supplied to the storage container until the hot water is detected by the high water level detection means, the hot water can be retained again in the pump even if the hot water in the pump falls off due to the siphon effect.

  As described above, according to the present invention, even when the storage container and the pump opened to the atmosphere above the cleaning nozzle are disposed, hot water can be reliably retained in the pump after the completion of the cleaning operation. Therefore, scale does not easily occur in the pump. Accordingly, it is possible to prevent pump failure such as fluctuation of the pump flow rate and sticking of the pump, and the washing operation can be stably performed over a long period of time.

FIG. 1: is a schematic block diagram which shows an example of the bathtub cleaning apparatus which concerns on embodiment of this invention. FIG. 2 is a part of a flowchart showing an example of control operation of the bathtub cleaning apparatus according to the embodiment of the present invention. FIG. 3 is a part of a flowchart showing an example of control operation of the bathtub cleaning apparatus according to the embodiment of the present invention.

Hereinafter, a bathtub cleaning device according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1: is a schematic block diagram which shows an example of the bathtub cleaning apparatus which concerns on this Embodiment. As shown in FIG. 1, the bathtub 1 is disposed along the bathroom wall in the bathroom BR, and the water heater 6, which is a heat source, is disposed outside the bathroom BR (for example, outdoors). Although not shown, the bath 1 constitutes an inner peripheral wall of the bath constituting the water storage section, an upper edge flange extending horizontally outward from the opening edge of the water storage section, and an outer surface of the bath 1 An inner space 10 is formed below the upper edge flange portion.

  At the bottom of the bath 1, a drainage plug 2 for draining bath water, which is hot water stored in the bath 1, and a washing nozzle 7 for jetting hot water or washing water are provided. Although not shown, the cleaning nozzle 7 has injection ports for radially injecting hot water and cleaning water supplied through the cleaning pipe 43 over the entire inner peripheral surface of the water storage portion of the bath 1. The injection port is configured such that the injection position of hot water or wash water fluctuates in the upper and lower regions of the inner circumferential surface of the water storage section according to the flow rate of hot water or wash water. A drainage switch 5 is provided at the upper edge flange portion of the bath 1, and the drainage switch 5 is connected to a drainage plug controller 50 for opening and closing the drainage plug 2 provided below the upper edge flange portion. Therefore, when the user operates the drainage switch 5 or operates the cleaning switch of the remote control R described later, the drainage plug 2 is opened, and the bath water in the bathtub 1 is drained.

  Although not shown, the water heater 6 includes a gas burner and a hot water supply heat exchanger. A gas supply pipe 78 is connected to the gas burner. The hot water supply heat exchanger includes a water supply pipe 63 for supplying clean water from a water supply source, and a hot water supply pipe for supplying hot and cold water heated from the water heater 6 to a hot water supply plug 65 such as curry or shower and a main unit 4 described later. 66 and are connected. A water heater controller 60 for controlling the operation of the water heater 6 is incorporated in the water heater 6, and various sensors such as a water supply sensor provided in the water supply pipe 63 and a water supply temperature sensor provided in the water heating pipe 66 The various control valves provided in the water supply pipe 63, the hot water supply pipe 66, and the gas supply pipe 78, the igniter, the power supply box, and the remote controller for the water heater are connected to the water heater controller 60. In the present embodiment, the water heater 6 has only a hot water supply heat exchanger, but a circulation fitting is provided in the bath 1, and a hot water supply heat exchanger and a bath heat exchanger are provided in the water heater 6 You may use the water heater which it has. In addition, an electric water heater or a heat pump water heater may be used.

  The water supply pipe 63 and the hot water supply pipe 66 are branched into the hot water supply plug 65 side and the main unit 4 side disposed on the ceiling of the bathroom BR. In the first temperature control water supply pipe 63a and the first hot water supply pipe 66a upstream of the hot water tank 47 branched from the water supply pipe 63 and the hot water supply pipe 66 to the main unit 4 respectively, check valves 71, 72 and hot water The mixing unit 80 is connected. More specifically, the hot water mixing section 80 is provided with a water temperature sensor 81, a water quantity sensor 83, a water quantity adjustment valve 85, and a first hot water supply pipe 66a sequentially interposed from the upstream side to the first temperature control water supply pipe 63a. The hot water temperature sensor 82, the hot water content sensor 84, and the hot water content adjusting valve 86 are provided in order from the upstream side. In addition, antifreeze heaters 73 and 74 are disposed around the piping of the first temperature control water supply pipe 63a and the first hot and cold water supply pipe 66a in the vicinity of the check valves 71 and 72, respectively. The first temperature control water supply pipe 63a and the first hot water supply pipe 66a join on the downstream side of the water amount adjustment valve 85 and the hot water amount adjustment valve 86, and constitute one second hot water supply pipe 66b. A temperature sensor 75 is interposed in the second hot water supply pipe 66b.

  The second hot water supply pipe 66b is connected to a hot water tank 47, which is a storage container, via a water replenishment electromagnetic valve (water replenishment valve) 46. In addition, the second hot water supply pipe 66b connecting the hot water / water mixing unit 80 and the hot water tank 47 branches the hot water supply pipe 66d, and the hot water supply pipe 66d is a solenoid valve for hot water. It is connected to a flush valve 79 located above the bathtub 1 via 90. An antifreeze heater 76 is disposed around the piping of the hot water supplying pipe 66 d between the branched portion of the second hot water supplying pipe 66 b and the hot water solenoid valve 90.

  Although not shown, at the upper part of the hot water tank 47, a water refilling port through which the hot and cold water supplied from the second hot and cold water supply pipe 66b is discharged, and an overflow port located below the water refilling port. In addition, an outlet is provided at the bottom of the hot water tank 47, and a hot water communication pipe 66c for supplying hot water to the pump 48 is connected to the outlet. Further, the overflow port is connected to an overflow pipe 68 extended in the bathtub pan in a state of being open to the atmosphere. Therefore, the hot water tank 47 is open to the atmosphere, and a spout space is formed between the water filling port and the overflow port, and the second hot water supply pipe 66 b is downstream of the hot water tank 47 by the hot water tank 47. It is cut off with the flow path. For this reason, the hot and cold water tank 47 functions as a backflow prevention means.

  In the hot water tank 47, high water level electrodes (high water level detection means) 471, low water level electrodes (low water level detection means) 472, and an earth electrode 473 having different lengths for detecting the amount of hot water stored. It is inserted. When the hot water is stored in the hot water tank 47, the high water level electrode 471 is disposed such that the lower end is located below the overflow port. The high water level electrode 471 and the low water level electrode 472 turn on when the water level reaches a predetermined high and low water level, and turn off when the water level does not reach a predetermined high and low water level.

  A pump 48 and an on-off solenoid valve (on-off valve) 49 are interposed in order from the upstream side on a hot water / water communication pipe 66 c connecting the hot water tank 47 and the detergent mixing unit 51. The pump 48 is driven and stopped, and the open / close solenoid valve 49 is opened and closed to supply and stop the hot water from the hot water tank 47 to the wash water generation unit 3, whereby the hot water and wash water from the washing nozzle 7 Injection and shutdown are performed. Further, by controlling the rotational speed of the pump 48, the flow rate of hot water or wash water jetted from the washing nozzle 7 is adjusted.

  Although not shown, the main unit 4 is provided with a casing in which each component such as the hot water mixing section 80, the hot water tank 47, and the pump 48 described above is accommodated, and the hot water / water mixing section 80 in the casing is A low temperature sensing temperature sensor 77 for detecting a temperature is provided. In addition, the water temperature sensor 81, the water temperature sensor 82, the water amount sensor 83, the water amount sensor 84, the water amount adjusting valve 85, the water amount adjusting valve 86, the antifreeze heaters 73, 74, 76, the temperature sensor 75, the low temperature sensing The temperature sensor 77, the solenoid valve 46 for water supply, the pump 48, the open / close solenoid valve 49, the solenoid valve 90 for hot water filling, and the electrodes 471, 472 and 473 in the hot and cold water tank 47 It is connected via wiring. Furthermore, the main unit controller 40 is connected to the cleaning unit controller 30, which will be described later, the remote controller R, and a power supply box (not shown) via electrical wiring.

  In the bathtub interior space 10 located below the upper edge flange portion of the bathtub 1, the detergent tank 41 for storing detergent, the venturi-type detergent mixing unit 51, and the detergent tank 41, which constitute the wash water generation unit 3, The detergent introduction pipe 44 for guiding the detergent of the present invention to the detergent mixing unit 51 is provided. The detergent introduction pipe 44 is provided with first and second detergent valves 42a and 42b for adjusting the supply of the detergent to the detergent mixing unit 51. Is interposed. The detergent mixing unit 51 and the cleaning nozzle 7 are connected via the cleaning pipe 43. The detergent tank 41, the first and second detergent valves 42a and 42b, and the detergent mixing unit 51 may be spaced apart from each other according to the size of the bathtub interior space 10 and the like. Good.

  The main unit 4 on the ceiling and the flush water generation unit 3 in the bathroom BR are connected by a hot and cold water communication pipe 66 c penetrating the bathroom wall on one side of the bathtub 1. More specifically, the hot water communication pipe 66 c is connected to the open / close electromagnetic valve 49 of the main unit 4 and the detergent mixing unit 51 of the washing water generation unit 3. Therefore, while the first and second detergent valves 42a and 42b are opened, the pump 48 is driven and the open / close solenoid valve 49 is opened to transfer hot water stored in the hot water tank 47 to the hot water communication pipe 66c. The detergent and the hot water are mixed by the negative pressure generated when the hot and cold water passes through the detergent mixing unit 51, and the washing water is generated through the washing pipe 43 and the washing nozzle. The washing water is sprayed from 7 to wash the bathtub 1. Further, in a state where the first and second detergent valves 42a and 42b are closed, the pump 48 is similarly driven and the open / close solenoid valve 49 is opened to communicate hot water stored in the hot water tank 47 with hot water When the water is supplied from the pipe 66c to the detergent mixing unit 51, only the hot and cold water is sprayed from the washing nozzle 7, and the preliminary washing and rinsing of the bath 1 are performed.

  Although not shown, the wash water generation unit 3 includes a casing in which the above-described detergent mixing unit 51 and the first and second detergent valves 42a and 42b are accommodated. Further, the cleaning unit controller 30 is incorporated in the cleaning water generation unit 3, and the first and second detergent valves 42a and 42b described above and the electrodes of the detergent tank 41 (not shown) are electrically connected with the cleaning unit controller 30. Connected through. Furthermore, the cleaning unit controller 30 is connected to the drain valve controller 50 and the main unit controller 40 via electrical wiring. In addition, the detergent mixing part 51 may use not only what mixes a detergent and hot water with negative pressure, but the stirring container which stirs and mixes a detergent and hot water may be used.

  A remote control R for filling operation and cleaning operation is disposed in the bathroom BR. For the remote control R, set the operation switch 101, the water filling switch 102 that performs water filling operation, the cleaning switch 103 that performs cleaning operation, the cleaning / water filling switch 104 that performs water filling operation after the cleaning operation is completed, and the water filling temperature The hot water temperature setting switch 105, the hot and cold water switch 106 for starting and stopping the hot water and hot water operation, the washing course setting switch 107 for selecting the washing course, the timer switch 108, the operating condition and the preset temperature are displayed. The display unit 110 is provided. Although not shown, the remote controller R is connected to the main unit controller 40 via an electrical wiring, and is connected to the cleaning unit controller 30 or the drainage plug controller 50 via the main unit controller 40. Each controller is comprised from the microcomputer provided with CPU, ROM, and RAM.

  Although not shown, the water heater controller 60 incorporates a hot water supply control circuit for controlling the hot water supply operation of the water heater 6, and the main body unit controller 40 has a cleaning control circuit (washing control unit) for controlling the cleaning operation. It has been incorporated. In addition, the washing control circuit, as the functional configuration means, the pump drive unit which drives the pump 48 at a predetermined number of rotations, opening and closing of the solenoid valve 46 for water replenishment and the on-off solenoid valve 49, the water amount adjustment valve 85 and the water amount adjustment valve 86 A valve drive unit that controls the opening degree, a water level determination unit that determines the water level in the hot water tank 47 by turning on and off the high and low water level electrodes 471, 472 and a clock unit that counts execution time in each process of the cleaning operation. Furthermore, in the memory of the main unit controller 40, programs for executing the cleaning operation and various setting values are stored.

  Next, control operation of the cleaning operation in the bathtub cleaning device of the present embodiment will be described with reference to FIGS. In the washing operation, at least a washing step of jetting washing water from the washing nozzle 7 and a rinsing step of jetting only hot water from the washing nozzle 7 are executed. The control operation after the rinsing step which is the final step will be described below. 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 becomes equal to or more than the predetermined amount of water, and 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 control to extinguish the gas burner.

  For example, when a predetermined cleaning time has passed and the cleaning process is completed and the process proceeds to the rinse process, it is determined whether the high water level electrode 471 is turned on. When the high water level electrode 471 is turned on, the water replenishment solenoid valve 46 is opened and the open / close solenoid valve 49 is opened, and the pump 48 is driven at a predetermined rotation number so as to obtain a predetermined flow rate. The timer td is started to clock a predetermined rinse time d (for example, 90 seconds). As a result, only hot and cold water is sprayed from the cleaning nozzle 7 into the bath 1, and the cleaning water adhering to the inner wall surface of the bath 1 sprayed in the cleaning step is washed away. On the other hand, when the high water level electrode 471 is off, hot water is supplied to the hot water tank 47 until the high water level electrode 471 is turned on by opening the electromagnetic valve 46 for water supply. Then, when the high water level electrode 471 is turned on, the open / close solenoid valve 49 is opened and the pump 48 is driven at a predetermined rotation speed to start the timer td in the same manner as described above (steps ST1 to ST7). In the present embodiment, the electromagnetic valve 46 for water supply is maintained in the open state during the rinsing process, but may be controlled to open or close according to the capacity of the hot water tank 47.

  When the low water level electrode 472 is turned off during execution of the rinse step, the pump 48 is once stopped, the on-off solenoid valve 49 is closed and the timer td is interrupted, and the hot water in the hot water tank 47 is increased. In this way, since the rinsing process can be executed in a state where hot water is always stored in the hot water tank 47, it is possible to prevent the entry of air into the hot water communication pipe 66c. Then, when the high water level electrode 471 is turned on, the open / close solenoid valve 49 is opened again, the pump 48 is driven and the timer td is restarted, and hot water is ejected from the cleaning nozzle 7 (steps ST8 to ST12 and ST5 ~ ST7). In the present embodiment, when the high water level electrode 471 is turned on, the on-off solenoid valve 49 is opened, but at least the low water level electrode 472 may be turned on.

  When the low water level electrode 472 is on and the excess time d elapses, the pump 48 is stopped, the on-off solenoid valve 49 is closed, and the cleaning operation is ended (steps ST13 to ST15). That is, on the condition that the low water level electrode 472 is turned on, the on-off electromagnetic valve 49 is closed to end the cleaning operation.

  When the cleaning operation is completed as described above, it is determined again whether the low water level electrode 472 is turned on. If the low water level electrode 472 is turned off, the water replenishment solenoid valve 46 is opened. After the hot and cold water is supplied to the hot and cold water tank 47 until the high water level electrode 471 is turned on, the water replenishment electromagnetic valve 46 is closed (steps ST16 to ST19).

  As described above in detail, according to the above-mentioned bathtub cleaning device, the on-off solenoid valve 49 is closed on condition that hot water is detected by the low water level electrode 472 and the cleaning operation is ended. At the end of the process, hot water can be retained in the pump 48 provided in the hot water communication pipe 66c. Therefore, in the bathtub cleaning apparatus, the hot water tank 47 and the pump 48 opened to the atmosphere above the washing nozzle 7 are disposed, but the hot water can be reliably retained in the pump 48, Scale does not easily occur in the pump 48. As a result, it is possible to prevent pump failure such as fluctuation or sticking of the pump flow rate, and to perform the washing operation stably for a long time.

  Further, according to the above-mentioned bathtub cleaning apparatus, when the low water level electrode 472 detects no hot water during the cleaning operation, the low water level electrode is supplied to the hot water tank 47 at least until the low water level electrode 472 detects the hot water. While maintaining the state in which hot and cold water is detected at 472, it is possible to reliably reach the end of the cleaning operation.

  Further, according to the bathtub cleaning device, since the open / close electromagnetic valve 49 is provided in the hot water communication pipe 66c downstream of the pump 48, for example, the pipe diameter of the hot water communication pipe 66c downstream of the open electromagnetic valve 49 is Even when air flows in from the cleaning nozzle 7 at the downstream end which is large and it is easy for hot water to drop off, hot water can be retained in the pump 48.

  Further, according to the above-mentioned bathtub cleaning device, since it is judged whether the hot water is detected by the low water level electrode 472 after the end of the washing operation, it remains in the hot water tank 47 until the on-off solenoid valve 49 is closed. It is possible to check whether a small amount of hot and cold water has fallen off by the siphon effect. Then, if hot water is not detected by the low water level electrode 472 after the end of the cleaning operation, hot water is supplied to the hot water tank 47 until hot water is detected by the high water level electrode 471, so the pump 48 is started until the next cleaning operation is started. Hot water can be reliably retained in the interior.

  In addition, when temperature falls in the winter season, hot and cold water in the piping tends to freeze. Therefore, when the temperature sensor 77 for detecting low temperature detects a predetermined freezing danger temperature or less, the open / close solenoid valve 49 is opened to drain water from the hot water communication pipe 66c including the inside of the pump 48. In the bathtub cleaning apparatus, since the pump 48 and the hot and cold water tank 47 are provided above the cleaning nozzle 7, it is possible to easily drain water.

7 cleaning nozzle 41 detergent tank 43 cleaning pipe 46 solenoid valve for refilling water
47 hot water tank (storage container)
48 pump 49 open / close solenoid valve (open / close valve)
51 Detergent mixing section 66c hot and cold water communication pipe 471 high water level electrode (high water level detection means)
472 Low water level electrode (low water level detection means)

Claims (4)

An open storage container for storing hot and cold water supplied from a heat source machine,
Low water level detection means for detecting a predetermined low water level in the storage container;
A cleaning nozzle provided in the bath,
A detergent tank for storing detergent,
A detergent mixing unit that generates wash water by mixing the hot water supplied from the storage container and the detergent supplied from the detergent tank;
Hot and cold water communication pipes that connect the storage container and the detergent mixing unit,
A washing pipe for supplying hot water and washing water from the detergent mixing section to the washing nozzle;
A pump provided in the hot water communication pipe for injecting and stopping hot water and washing water from the washing nozzle;
An on-off valve for opening and closing the flow path of the hot water communication pipe,
And a washing control unit for performing a washing operation of washing the bath by spraying hot water and washing water into the bath from the washing nozzle.
The reservoir and the pump are disposed above the cleaning nozzle,
A bathtub cleaning device that closes the on-off valve and terminates the cleaning operation on condition that hot water is detected by the low water level detection means. In the bathtub cleaning device according to claim 1,
During washing operation, when hot water is not detected by the low water level detection means, the pump is stopped and the on-off valve is closed, and the hot water is supplied to the storage container at least until hot water is detected by the low water level detection means . In the bathtub cleaning device according to claim 1 or 2,
The on-off valve is provided in the hot water communication pipe downstream of the pump. The bath cleaning device according to any one of claims 1 to 3, further,
High water level detection means for detecting a predetermined high water level in the storage container;
A bathtub cleaning apparatus which supplies hot water to the storage container until hot water is detected by the high water level detection means when hot water is not detected by the low water level detection means after the washing operation is finished.

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