JP7445134B2 - Bathtub cleaning device - Google Patents

Description

The present invention relates to a bathtub cleaning device that automatically cleans a bathtub, and more particularly to a bathtub cleaning device that includes a hot water storage section for using stored hot water to clean the bathtub.

BACKGROUND ART Bathtub cleaning devices that automatically clean bathtubs have been known. The bathtub cleaning device cleans the bathtub by spraying a cleaning liquid into the bathtub to float dirt and then spraying hot water to wash it away.

For example, in Patent Document 1, in a wall-mounted bathroom cleaning device, clean water is jetted out from a water nozzle part, and clean water stored in a water tank and detergent in a detergent tank are sucked up and mixed with a cleaning liquid from the detergent nozzle part. It is described that it should be squirted. However, in an environment where the supply pressure of clean water is low, it becomes difficult to sufficiently spray clean water from the water nozzle to a location distant from the water nozzle as in Patent Document 1, and there is a possibility that sufficient cleaning cannot be performed.

Therefore, it is conceivable to use a pump to send out a certain amount of hot water stored in a tank open to the atmosphere, as in the bathtub cleaning device of Patent Document 2, for example. However, if hot water is constantly stored as in Patent Document 2, there is a risk that the temperature of the hot water will drop and the cleaning ability will not be sufficiently exerted.

Therefore, the present applicant has already proposed a bathtub cleaning device that stores the hot water necessary for bathtub cleaning in a hot water storage section and uses a pump to spray the hot water from the hot water storage section from a cleaning nozzle (patent application). 2020-125416).

Japanese Patent Application Publication No. 10-272071 Publication No. 4-40632

In order to stably supply hot water to the cleaning nozzle, the bathtub cleaning device proposed above switches the amount of hot water flowing into the hot water storage section between a first mode that is larger than the pump discharge amount and a second mode that is smaller than the pump discharge amount. Equipped with multiple electromagnetic on-off valves (pouring electromagnetic valves). In the first mode, a plurality of hot water pouring solenoid valves are opened, and in the second mode, some of the hot water pouring solenoid valves are closed, thereby switching the inflow amount of hot water into two stages.

However, the hot water pouring solenoid valve that closes in the second mode is repeatedly switched between the open state and the closed state during bathtub cleaning, so the valve body wears out more than the hot water pouring solenoid valve that remains open even in the second mode. There was a problem in that as these problems progressed and deteriorated quickly, repairs or replacements were required at an early stage.

An object of the present invention is to provide a bathtub cleaning device in which the durability of a plurality of hot water pouring electromagnetic valves for stably supplying hot water to a cleaning nozzle is improved.

A bathtub cleaning device according to a first aspect of the present invention includes a hot water passage that supplies hot water to a cleaning nozzle disposed in a bathtub, a hot water storage part provided in the middle of the hot water passage, and a hot water storage part that supplies hot water to the hot water storage part. In the bathtub cleaning device, the bathtub cleaning device includes a pump for sending hot water to a cleaning nozzle, and a control means for controlling a cleaning operation for spraying hot water and cleaning liquid from the cleaning nozzle, in which the hot water passage includes, upstream of the hot water storage section, A parallel passage section in which a plurality of branch passages are connected in parallel, and a plurality of hot water pouring electromagnetic valves for opening and closing the plurality of branch passages, respectively, are provided, and the control means is configured to control, during spraying of hot water and cleaning liquid, The plurality of hot water pouring electromagnetic valves are made to share a first function of maintaining an open state and a second function of switching between an open state and a closed state depending on the amount stored in the hot water storage section, and the first function and The present invention is characterized in that the functions of the plurality of pouring electromagnetic valves are exchanged when a predetermined condition is satisfied so as to alternately share the second function.

According to the above configuration, the hot water pouring solenoid valve has a first function that maintains an open state while hot water or cleaning liquid is being sprayed, and a second function that switches between an open state and a closed state depending on the amount of water stored in the hot water storage section. Although the amount of water stored in the hot water storage section is repeatedly increased and decreased by the hot water pouring electromagnetic valve, hot water from the hot water storage section can be stably supplied to the cleaning nozzle. By exchanging the functions of the plurality of pouring solenoid valves when a predetermined condition is met, the plurality of pouring solenoid valves are assigned the first function and the second function alternately, thereby reducing the number of times the multiple pouring solenoid valves open and close. Can be leveled to improve durability.

In the bathtub cleaning device of the invention according to claim 2, in the invention according to claim 1, the control means operates the hot water pouring electromagnetic device of the second function when the storage amount exceeds a first reference amount set as an upper limit. The present invention is characterized in that the valve is switched to a closed state, and when the stored amount becomes equal to or less than a second reference amount set as a lower limit, the second function pouring electromagnetic valve is switched to an open state.
According to the above configuration, since the amount of hot water stored in the hot water storage section is repeatedly increased and decreased between the first reference amount as the upper limit and the second reference amount as the lower limit, it is possible to prevent hot water from overflowing from the hot water storage section and to prevent the pump from overflowing. Hot water from the hot water storage section can be stably supplied to the cleaning nozzle by preventing air from entering (air trapping).

The bathtub cleaning device of the invention according to claim 3 is the invention according to claim 1 or 2, further comprising water level detection means for detecting the water level in order to determine the storage amount based on the water level of the hot water storage section. It is characterized by
According to the above configuration, the hot water pouring electromagnetic valve set with the second function can be easily controlled in accordance with the water level that fluctuates up and down as the amount of hot water stored in the hot water storage section increases and decreases.

The bathtub cleaning device according to claim 4 is characterized in that, in any one of claims 1 to 3, the plurality of hot water pouring electromagnetic valves have the same flow rate in the open state.
According to the above configuration, even if the roles of the first function and the second function are exchanged between the plurality of pouring electromagnetic valves, the speed at which the amount of hot water stored in the hot water storage section increases or decreases does not change. A stable supply of hot water is possible.

In the bathtub cleaning device of the invention according to claim 5, in any one of claims 1 to 4, the control means is configured to meet the predetermined condition when the number of times the cleaning operation is performed exceeds a preset reference number of times. It is characterized by determining that it has been established.
According to the above configuration, the roles of the first function and the second function are exchanged between the plurality of pouring solenoid valves depending on the number of times the cleaning operation is performed, so that the number of times the plurality of pouring solenoid valves are opened and closed can be easily equalized. Can be done.

According to the bathtub cleaning device of the present invention, it is possible to equalize the number of openings and closings of the plurality of hot water pouring solenoid valves for stably supplying hot water to the cleaning nozzle, thereby improving the durability of the plurality of hot water pouring solenoid valves. be able to.

1 is a configuration diagram of a bathtub cleaning device and peripheral equipment according to an embodiment of the present invention. It is a process block diagram of the washing|cleaning operation based on an Example. It is a flowchart of the function allocation setting control of the pouring electromagnetic valve based on an Example. FIG. 6 is an explanatory diagram of the operation of the pouring electromagnetic valve in the branch passage section. FIG. 5 is an explanatory diagram of the operation in which the functions of the pouring electromagnetic valve of FIG. 4 are exchanged.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated based on an Example.

First, the overall configuration of the bathtub cleaning device 10 of the present invention including peripheral equipment will be described based on FIG. 1. A hot water supply device 2 for filling and reheating the bathtub 1 is connected to the bathtub 1 via a hot water filling and reheating passage 3 and a circulation adapter 1a. Furthermore, as shown by arrow D, the bottom of the bathtub 1 is provided with, for example, an electric drain plug 4 for draining hot water and a cleaning nozzle 5 for cleaning the bathtub 1 by spraying hot water or cleaning liquid. has been done.

Near the bathtub 1, there are a supply unit 6 for supplying hot water and cleaning liquid to the cleaning nozzle 5, a detergent tank 7 for storing detergent, and a drain switch 8 for opening and closing the drain valve 4. It is arranged. The bathtub cleaning device 10 includes a drain plug 4, a cleaning nozzle 5, a supply unit 6, a detergent tank 7, a drain switch 8, and the like.

A hot water supply passage 2 a for supplying hot water from the hot water supply device 2 is connected to the supply unit 6 . Further, for example, a power supply communication unit 9 disposed on the ceiling of a bathroom and a supply unit 6 are connected to enable power supply and communication. The power supply communication unit 9 includes a control section 20 (control means) that controls the cleaning operation of the bathtub cleaning device 10 and the like.

The water heater 2 is a combustion type water heater that heats the tap water indicated by the arrow W using, for example, the combustion heat of fuel. There may be. A bathroom remote controller 11 and a kitchen remote controller 12 are communicably connected to the water heater 2 for performing operations such as starting hot water filling operation and reheating operation, and setting operations for setting a hot water supply temperature. Further, a cleaning remote control 13 for performing operations such as starting a cleaning operation by the bathtub cleaning device 10 is communicably connected to the power supply communication unit 9. The hot water supply device 2 and the power supply communication unit 9 are communicably connected, and the bathtub cleaning device 10 can also be operated from the kitchen remote control 12 and the bathroom remote control 11.

Next, the bathtub cleaning device 10 will be explained.
The supply unit 6 of the bathtub cleaning device 10 includes a hot water passage 14 that supplies hot water to the cleaning nozzle 5 , a hot water tank 15 (hot water storage section) provided in the middle of the hot water passage 14 , and a hot water tank 15 that supplies hot water to the cleaning nozzle 5 . It has a pump 16 etc. for sending out hot water. A venturi 17 (detergent mixing section) for mixing detergent into the hot water supplied to the cleaning nozzle 5 is interposed in the hot water passage 14 on the downstream side of the pump 16 .

A hot water passage 2a that supplies hot water from the water heater 2 is connected to a hot water passage 14 that includes a filter 14a. The hot water passage 14 has a parallel passage section 18 that branches and merges upstream of the hot water tank 15 and downstream of the filter 14a. In the parallel passage section 18, a plurality (for example, two) of branch passages 18a and 18b are connected in parallel.

The branch passage 18a includes a pouring electromagnetic valve 18c and a constant flow valve 18e for opening and closing the branch passage 18a. The branch passage 18b includes a pouring electromagnetic valve 18d and a constant flow valve 18f for opening and closing the branch passage 18b. The constant flow valves 18e and 18f each limit the flow rate to a flow rate smaller than the discharge capacity of the pump 16 (for example, 6.5 L/min as a normal flow rate), and the constant flow valves 18e and 18f each limit the flow rate to a value smaller than the discharge capacity of the pump 16 (for example, 6.5 L/min as a normal flow rate), and the constant flow valves 18e and 18f limit the flow rate to a flow rate smaller than the discharge capacity of the pump 16 (for example, 6.5 L/min as a normal flow rate). 5L/min) were selected. The flow rates when the pouring solenoid valves 18c and 18d in the branch passages 18a and 18b are opened are made equal to each other by the constant flow valves 18e and 18f.

Further, the hot water passage 14 is provided with a pump 16, a temperature sensor 19, a flow rate sensor 14b, a venturi 17, etc. on the downstream side of the hot water tank 15. A detergent passage 7a for supplying detergent from the detergent tank 7 is connected to the venturi 17. The detergent passage 7a includes a detergent solenoid valve 7b for opening and closing the detergent passage 7a.

The control unit 20 is connected so as to be able to open and close the hot water pouring solenoid valves 18c and 18d, the detergent solenoid valve 7b, and drive the pump 16, and is connected so that the drain valve 4 can be opened and closed in accordance with the operation of the drain switch 8. has been done. Further, the control unit 20 is connected to a water level detection means for detecting a water level corresponding to the amount of hot water stored in the hot water tank 15, such as a float switch 15a, so that the amount of hot water stored can be detected. Similarly, the control unit 20 is connected so that the remaining amount of detergent in the detergent tank 7 can be detected by, for example, a float switch 7c.

Note that the float switch 15a may be configured to detect a first reference amount H corresponding to the upper limit water level of the hot water tank 15 and a second reference amount L corresponding to the lower limit water level. Further, as the water level detection means, a plurality of electrodes may be used to detect the first reference amount H and the second reference amount L, respectively, but the float switch 15a is preferable from the viewpoint of preventing false detection of the amount of hot water stored due to water splashing, etc. .

The control unit 20 is, for example, a computer equipped with an arithmetic unit, a storage device, an input/output device, etc., and performs cleaning operations for cleaning the bathtub 1, opening and closing of the drain valve 4, etc. based on a control program stored in the storage device. control. During the cleaning operation, the control unit 20 opens the drain valve 4, controls the opening and closing of the hot water pouring solenoid valves 18c and 18d, the detergent solenoid valve 7b, etc., and drives the pump 16.

Next, the cleaning operation will be explained.
The cleaning operation is performed with the bathtub 1 covered with a lid (not shown) to prevent cleaning liquid etc. from scattering outside the bathtub 1.

When the operation terminal such as the cleaning remote control 13 is operated to start the cleaning operation by the bathtub cleaning device 10, the cleaning operation is started. For example, as shown in the process block diagram of the cleaning operation in FIG. 2, the cleaning operation is performed in the order of a setting process, a preparation process, a cleaning process, and a draining process.

In the setting step, the currently set functional assignments of the plurality of pouring electromagnetic valves 18c and 18d are read, and when a predetermined condition is satisfied, for example, when the number of times the cleaning operation is performed exceeds a preset reference number, The functional assignments of the plurality of pouring electromagnetic valves 18c and 18d are set interchangeably. The function allocation setting control by the control unit 20 at this time will be explained based on the flowchart of FIG. 3. Si (i=1, 2, . . . ) in the figure represents a step.

In S1, since the cleaning operation has been started, the number of cleaning operations N is increased by 1 and the process proceeds to S2. In S2, the current function sharing setting of the plurality of pouring electromagnetic valves 18c and 18d is read, and the process proceeds to S3. For example, the first function of maintaining the open state while spraying hot water, etc. is set to the hot water pouring solenoid valve 18c, and the second function of opening and closing according to the amount stored in the hot water tank 15 during the sprinkling of hot water, etc. is set to the hot water pouring solenoid valve 18c. It is set to the valve 18d.

In S3, it is determined whether the number of cleaning operations N, which is increased by 1 each time a cleaning operation is performed, exceeds a reference number of times (for example, 10 times). Note that the reference number of times can be set as appropriate.

If the determination in S3 is Yes (when a predetermined condition is satisfied), the process proceeds to S4, in which the functional assignments of the plurality of pouring electromagnetic valves 18c, 18d are exchanged, and the process proceeds to S5. For example, the second function is set to the pouring solenoid valve 18c, which currently has the first function, and the first function is set to the pouring solenoid valve 18d, which currently has the second function, so that the functions of the plurality of pouring solenoid valves 18c and 18d are divided. Set replacement.

In S5, since this is the first cleaning operation after the replacement setting, the number of cleaning operations N is reset to 1, the function allocation setting control is ended, and the setting process is ended. On the other hand, when the determination in S3 is No (when the predetermined condition is not satisfied), the function allocation setting control is ended without replacing the function allocation, and the setting process is ended. In the following description, it is assumed that the first function is set to the pouring solenoid valve 18c, and the second function is set to the pouring solenoid valve 18d.

In the preparation step of FIG. 2, as a preparation operation before cleaning, for example, the first function hot water pouring electromagnetic valve 18c is opened to store hot water in the hot water tank 15 to a predetermined amount (first reference amount H). Further, if the drain plug 4 is closed, the drain plug 4 is opened, and if hot water remains in the bathtub 1, the system waits until the bathtub 1 is empty. The hot water storage state shown in FIG. 4(a) and the hot water storage completed state shown in FIG. 4(b) correspond to this preparation step. In FIG. 4, hot water flowing into the hot water tank 15 from the hot water supply device 2 via the parallel passage section 18 and hot water flowing out from the hot water tank 15 are indicated by white arrows.

In the cleaning process shown in FIG. 2, hot water or cleaning liquid from the hot water tank 15 is sprayed into the bathtub 1 as a cleaning operation. For example, the pump 16 is driven to start supplying hot water to the cleaning nozzle 5 at a normal flow rate (see FIG. 4(c)), and the hot water is stored in the hot water tank 15 by opening the hot water pouring solenoid valve 18c, etc. Hot water is sprayed from step 5 (see FIGS. 4(d) and 4(e)) to moisten the dirt adhering to the bathtub 1 as a preliminary cleaning.

Thereafter, while driving the pump 16, the detergent solenoid valve 7b was opened to supply detergent from the detergent passage 7a to the hot water flowing through the venturi 17, and the venturi 17 sprayed a cleaning solution containing a mixture of hot water and detergent from the cleaning nozzle 5. After that, wait for a certain period of time. This spraying of the cleaning liquid and waiting for a certain period of time are repeated alternately to float the dirt attached to the bathtub 1. While on standby, the storage of hot water is stopped, and when spraying of the cleaning solution is resumed, the storage of hot water is resumed in the same state as before the standby.

When spraying hot water or cleaning liquid, hot water at a normal flow rate is supplied from the hot water tank 15 to the cleaning nozzle 5 by the pump 16. Due to the hot water pouring solenoid valves 18c and 18d that are opened and closed at this time, in the hot water tank 15, when in the first mode in which both the hot water pouring solenoid valves 18c and 18d are open, the amount of water stored increases. In the second mode in which only one of the valves is opened, the storage amount decreases.

At the start of preliminary cleaning, hot water is stored in the second mode in which only the hot water pouring solenoid valve 18c set to the first function is opened (see FIG. 4(d)). During spraying of hot water or cleaning liquid, when the float switch 15a detects the second reference amount L, the control unit 20 shifts to the first mode, and sets the first function pouring solenoid valve 18c and the second function. Open both of the molten metal pouring solenoid valves 18d (see FIG. 4(e)). When the float switch 15a detects the first reference amount H, it shifts to the second mode and closes the second function pouring solenoid valve 18d while keeping the first function pouring solenoid valve 18c open (see FIG. 4). d)).

When hot water or cleaning liquid is being sprayed, switching between the first mode and the second mode is repeated, and the amount stored in the hot water tank 15 repeatedly changes back and forth between the upper limit storage amount H and the lower limit storage amount L. , hot water from the hot water tank 15 can be stably supplied to the cleaning nozzle 5 regardless of the hot water supply pressure from the hot water supply device 2 .

After spraying the cleaning liquid and waiting are repeated a predetermined number of times, the pump 16 is driven for rinsing and hot water is sprayed to wash away dirt and the cleaning liquid, and the cleaning process is completed. There are cases where the cleaning process is completed in the first mode and cases where the cleaning process is completed in the second mode, but in either case it is possible to proceed to the drainage process. In addition, when waiting for a certain period of time from the first mode, or when finishing the cleaning process from the first mode, the process shifts to the second mode for a short period of time, such as the last few seconds, and the plurality of pouring electromagnetic valves 18c, 18d are activated. The water hammer effect can also be reduced compared to when both are closed at the same time.

In the draining step, a draining operation is performed to drain the hot water remaining in the hot water tank 15 from the cleaning nozzle 5 into the bathtub 1 with both the pouring electromagnetic valves 18c and 18d closed (see FIG. 4(f)). When the hot water tank 15 is empty, the pump 16 is stopped to complete the drainage process and the cleaning operation is completed (see FIG. 4(g)).

The fact that the hot water tank 15 is empty means that, for example, the flow rate detected by the flow rate sensor 14b has fallen below a predetermined flow rate (for example, 1 L/min), or the float sensor 15a that detects the water level of the hot water tank 15 has reached a predetermined lower limit. This determination is made when a predetermined period of time (for example, 3 seconds) has elapsed since the storage amount L was detected. Note that the determination can also be made based on the current value of the pump 16 that reflects the load on the pump 16.

When the above-described cleaning operation is repeated and the number N of cleaning operations exceeds the reference number, the currently set functions of the first function pouring solenoid valve 18c and the second function pouring solenoid valve 18d are changed. They are exchanged, and the second function is set to the pouring solenoid valve 18c, and the first function is set to the pouring solenoid valve 18d. Then, a cleaning operation is performed as shown in FIGS. 5(a) to 5(g), and when the number of times N of this cleaning operation is performed exceeds the standard number of times, the cleaning operation shown in FIGS. 4(a) to 4(g) is performed. The functional assignments of the plurality of pouring electromagnetic valves 18c and 18d are exchanged so that the operations are carried out. Therefore, the number of openings and closings of the plurality of pouring electromagnetic valves 18c and 18d is equalized, and the progress of deterioration becomes equal.

Although we have explained an example in which the number of cleaning operations N exceeds the standard number of times as the predetermined condition is satisfied, it is also possible to change the function allocation based on the number of openings and closings of the pouring solenoid valve to which the second function is set. Alternatively, during the cleaning operation, the second function may be set alternately. Furthermore, although an example has been described in which the function assignment is replaced in the setting step at the start of the cleaning operation, the function assignment replacement may be set at the end of the cleaning operation in preparation for the next cleaning operation. Even if three or more branch passages equipped with pouring solenoid valves are connected in parallel to form a parallel passage section, the first and second functions are designed to equalize the number of openings and closings of each pouring solenoid valve. All you have to do is have them take turns sharing the tasks.

The functions and effects of the bathtub cleaning device 10 described above will be explained.
During the spraying of hot water or cleaning liquid, the first function of the hot water pouring solenoid valve 18c (18d) is maintained in the open state, and the second function of the hot water pouring solenoid valve 18c (18d) is switched between the open state and the closed state depending on the amount of water stored in the hot water tank 15. The hot water electromagnetic valve 18d (18c) repeatedly increases and decreases the amount of water stored in the hot water tank 15, so that hot water from the hot water tank 15 can be stably supplied to the cleaning nozzle 5. Since the plurality of pouring solenoid valves 18c and 18d are made to alternately perform the first function and the second function, the number of opening and closing of the plurality of pouring solenoid valves 18c and 18d can be equalized and durability can be improved. .

In addition, since the amount stored in the hot water tank 15 is repeatedly increased and decreased between the first reference amount H as the upper limit and the second reference amount L as the lower limit, it is possible to prevent hot water from overflowing from the hot water tank 15 and to supply air to the pump 16. It is possible to stably supply hot water from the hot water tank 15 to the cleaning nozzle 15 by preventing the mixture of water (air entrapment).

In order to determine the stored amount based on the water level in the hot water tank 15, the float switch 15a is provided as a water level detection means for detecting the water level. It can be easily controlled according to the water level, which fluctuates up and down as the storage amount increases and decreases.

Since the plurality of hot water pouring solenoid valves 18c and 18d have the same flow rate in the open state, even if the first function and the second function are exchanged between the plurality of hot water pouring solenoid valves 18c and 18d, the storage of hot water in the hot water tank 15 is maintained. The speed of increase and decrease in quantity remains unchanged. Therefore, hot water from the hot water tank 15 can be stably supplied to the cleaning nozzle 5.

The control unit 20 determines that the predetermined condition is satisfied when the number of times N of the cleaning operation is performed exceeds a preset reference number of times. Since the roles of the first function and the second function are exchanged between the plurality of pouring solenoid valves 18c and 18d depending on the number of times N of cleaning operation is performed, the number of times of opening and closing of the plurality of pouring solenoid valves 18c and 18d can be easily equalized. be able to.

In addition, those skilled in the art can implement various modifications to the embodiments described above without departing from the spirit of the present invention, and the present invention includes such modifications.

1: Bathtub 1a: Circulation adapter 2: Water heater 2a: Hot water supply passage 3: Hot water filling and reheating passage 4: Drain plug 5: Washing nozzle 6: Supply unit 7: Detergent tank 7a: Detergent passage 7b: Detergent solenoid valve 7c: Float Switch 8: Drain switch 9: Power communication unit 10: Bathtub cleaning device 11: Bathroom remote control 12: Kitchen remote control 13: Cleaning remote control 14: Hot water passage 14a: Filter 14b: Flow rate sensor 15: Hot water tank (hot water storage section)
15a: Float switch (water level detection means)
16: Pump 17: Venturi (detergent mixing part)
18: Parallel passage sections 18a, 18b: Branch passages 18c, 18d: Molten pouring solenoid valves 18e, 18f: Constant flow valve 19: Temperature sensor 20: Control section (control means)

Claims (5)

A hot water passage supplying hot water to a cleaning nozzle arranged in a bathtub, a hot water storage part provided in the middle of the hot water passage, a pump for sending hot water from the hot water storage part to the cleaning nozzle, and the cleaning In a bathtub cleaning device equipped with a control means for controlling a cleaning operation that sprays hot water and cleaning liquid from a nozzle,
The hot water passage includes a parallel passage section in which a plurality of branch passages are connected in parallel, and a plurality of hot water pouring electromagnetic valves for opening and closing the plurality of branch passages, respectively, on the upstream side of the hot water storage section. established,
The control means has a first function of maintaining the plurality of hot water pouring electromagnetic valves in an open state during the dispersion of hot water and cleaning liquid, and is configured to switch between an open state and a closed state depending on the amount stored in the hot water storage section. The bathtub cleaning device is characterized in that the functions of the plurality of hot water pouring electromagnetic valves are exchanged when a predetermined condition is satisfied so that the first function and the second function are shared alternately. The control means switches the second function pouring electromagnetic valve to a closed state when the storage amount exceeds a first reference amount set as an upper limit, and switches the second function pouring electromagnetic valve to a closed state when the storage amount becomes a first reference amount set as an upper limit. 2. The bathtub cleaning device according to claim 1, wherein the second function of the solenoid valve is switched to an open state when the amount of hot water becomes less than a reference amount. The bathtub cleaning device according to claim 1 or 2, further comprising water level detection means for detecting the water level in order to determine the stored amount based on the water level of the hot water storage section. The bathtub cleaning device according to any one of claims 1 to 3, wherein the plurality of pouring electromagnetic valves have the same flow rate when in an open state. 5. The control means determines that the predetermined condition is satisfied when the number of times the cleaning operation is performed exceeds a preset reference number of times. Bathtub cleaning device.