KR20130039284A - Automatic water supply apparatus for bathtub and control method thereof - Google Patents

Abstract

PURPOSE: An automatic water supply apparatus for a bathtub and a control method thereof are provided to prevent the damage or deformation of a pipe and a bathtub part according to the supply of initial hot water. CONSTITUTION: An automatic water supply apparatus for a bathtub includes a bathtub part(10) supplying water inside; a warm water supply part(20) supplying hot water to the bathtub part; a cold water supply part(30) supplying cold water to the bathtub part; a water level sensor(40) sensing the water level of accommodated water; and a temperature sensor(50) sensing the temperature of accommodated water. The water supply part equips with a first opening/closing member installed in a warm water pipe, a second opening/closing member installed in a cold water pipe, and a water supply pipe supplying warm water and cold water respectively supplied from the warm water pipe and cold water pipe.

Description

Technical Field [0001] The present invention relates to an automatic water supply apparatus for a bathtub,

The present invention relates to an automatic water supply apparatus and a control method thereof, and more particularly, to an automatic water supply apparatus and a control method therefor, which are capable of automatically controlling a water temperature and a water level of water supplied to a bath using a temperature sensor and a water level sensor, And a control method thereof.

In recent years, as the leisure time has increased and the living standard has increased, there has been a tendency that the user who enjoys the bath culture using the bath such as the spa, the sauna and the public bath is gradually increasing. It is common for the manager to manually open and close the hot water and cold water supply valves to appropriately adjust the water temperature and water level.

However, in the case of such a manual water supply device, the user or the manager must directly open and close the water supply valve of hot water and cold water while checking the water temperature and the water level at every watering time, thereby causing inconvenience to the user. It is not easy to adjust the water temperature, which results in a waste of hot water or cold water.

In order to solve this problem, a device for automatically controlling the water temperature and water level of water supplied to the bathtub has been developed. The detailed configuration of such devices is disclosed in [Document 1] and [Document 2].

However, in the case of the above-mentioned [1], there is a problem that a considerable time has to be elapsed in order to adjust the temperature of the water because the water is heated by using the heater while circulating the water in the bath after the completion of the initial water supply. May be increased in size.

Also in the case of [2] above, a method of automatically opening and closing the electromagnetic valve for supplying hot water and cold water and automatically supplying water at a temperature set by the user is applied. However, the sampling time of the temperature sensor installed in the water pipe There is a problem in that it is very difficult to substantially supply water at a temperature set by the user in consideration of the reaction speed of the solenoid valve.

In the case of [Document 2], since the cold water pipe and the hot water pipe are directly connected to the inlet of the water pipe, the hot water and the cold water passed through the water pipe are supplied to the inside of the bath before being mixed, There is also the problem that it can receive the physical damage such as the surprise or the image.

Further, in the above-mentioned [2], when the hot water is first supplied to the inside of the bathtub, hot water of high temperature is directly supplied to the inside of the bathtub through the pipe, which may cause thermal deformation or damage of the pipe or bathtub .

[Patent Document 1] Published Korean Patent Application No. 2009-40975 (Published on April 28, 2009)

[Patent Document 2] Published Korean Patent Application No. 2006-106533 (published on October 12, 2006)

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art, and it is an object of the present invention to provide a water level sensor and a water level sensor for automatically controlling a water temperature and a water level of water supplied to a bath, And a control method of the automatic water supply device of the bathtub.

It is a further object of the present invention to provide a method and an apparatus for providing cold water and hot water in a buffer space before being supplied into a bathtub, And to provide a bath automatic water supply device and a control method thereof that can prevent damage in advance.

In order to achieve the above object, an automatic water supply apparatus of a bathtub according to the present invention comprises a bathtub unit, a water supply unit for supplying or cutting off cold water and hot water to the bathtub unit, Wherein the control unit controls the operation of the water supply unit, wherein after the water of the first temperature lower than the set temperature is first supplied to the bathtub unit, water of the second temperature higher than the first temperature is supplied to the bathtub unit To be supplied.

The water supply unit includes a first opening and closing member provided in the hot water pipe, a second opening and closing member provided in the cold water pipe, and a water supply pipe for supplying hot water and cold water supplied from the hot water pipe and the cold water pipe to the bathtub unit, respectively And the control unit controls the operation of the first and second open / close members so that the water of the first temperature or the second temperature is supplied to the bathtub unit.

The apparatus may further include a buffer container provided in the middle of the water supply pipe and a first water circulation unit for extracting the water stored in the tub and supplying the water to the buffer container, And the operation of the first water circulation unit is controlled so that water supplied from the water supply unit and water supplied from the first water circulation unit are diluted with each other in the buffer container unit and supplied to the bathtub unit.

In addition, the buffer container portion is characterized in that the first outlet hole in which the water supplied from the water supply unit is introduced and the second outlet hole in which the water supplied from the first water circulation unit is introduced to face each other.

In addition, the first discharge hole and the second discharge hole is characterized in that the nozzle device for injecting water, respectively.

The controller may further include a water level sensor installed in the bathtub for sensing the level of water contained therein, wherein the controller controls the water supply controller to stop supply of hot water and cold water when the water level detected by the water level sensor reaches a predetermined water level, The control unit controls the control unit.

The apparatus may further include a temperature sensor unit installed in the bathtub unit for sensing a temperature of water contained in the bathtub unit, and a second water circulation unit for drawing out the water in the bathtub unit, When the water temperature sensed by the temperature sensor unit is lower than the set temperature after the supply of the hot water and the cold water is cut off, the second water circulation unit is operated.

The second water circulation unit may include a circulation pump circulating water in the bathtub through an external water circulation pipe, an auxiliary heater installed in the middle of the water circulation pipe to heat the circulated water, And a filtering device installed in the middle of the circulating water to remove foreign substances contained in the circulated water.

The washing machine may further include a water softener installed between the water supply part and the bathtub part to change the water supplied to the bathtub part into soft water.

The bathtub unit may include a bathtub in which water is accommodated and an illuminator installed at a side of the rim of the bathtub. The illuminator selectively transmits light emitted from the light source, .

According to another aspect of the present invention, there is provided an automatic water supply control method for a bathtub, comprising: a first step of supplying water of a first temperature lower than a set temperature set by a user to a bath through a water supply unit; A second step of supplying water of a second temperature higher than the first temperature to the bath through the water supply part, a third step of shutting off the water supply when the water contained in the bath reaches the set water level, And a fourth step of withdrawing and heating the water in the bath when the measured water temperature in the bath is lower than the set temperature, and then supplying the heated water to the bath.

The second step is characterized in that the water withdrawn from the bath is supplied to the bath at a second temperature supplied from the water supply unit.

According to the above-described structure, the automatic water supply apparatus and control method of the bathtub according to the present invention can automatically control the water temperature and the water level of the water supplied to the bathtub unit by using the temperature sensor and the water level sensor, So that damage or deformation of the piping and the tub part due to the supply of the initial high temperature water can be prevented.

In addition, the automatic water supply device and the control method of the bathtub according to the present invention may be configured such that the cold water and the hot water are completely diluted in the first buffer container before being supplied to the bathtub, It is advantageous in that the physical damage caused by the exposure can be prevented in advance.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing the overall configuration of an automatic water supply apparatus for a bathtub according to an embodiment of the present invention;
Fig. 2 is a block diagram showing the operational configuration of the automatic water supply apparatus of the bath shown in Fig. 1,
Fig. 3 is a view showing another modification of the automatic water supply device of the bathtub shown in Fig. 1, and Fig.
4 is a flowchart for explaining a control method of the automatic water supply device of the bathtub shown in Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing an overall configuration of an automatic water supply apparatus for a bathtub according to an embodiment of the present invention, and FIG. 2 is a block diagram showing an operational configuration of an automatic water supply apparatus for a bathtub shown in FIG. Fig. 3 is a view showing another modification of the automatic water supply device of the bathtub shown in Fig. 1, and Fig. 4 is a flowchart for explaining a method of controlling the automatic water supply device of the bathtub shown in Fig.

The automatic water feeder 1 of the present embodiment includes a tub portion 10 to which water is supplied, a hot water supply portion 20 to supply hot water to the tub portion 10, A cold water supply unit 30 for supplying cold water, a water level sensor unit 40 installed inside the bathtub unit 10 for sensing the level of water contained in the bathtub unit 10, And a temperature sensor unit 50.

First, the bathtub unit 10 may be suitably realized using a material such as synthetic resin or ceramic as a conventional bathtub used for bathing, half bathing, etc. in a general home, a spa, a sauna, or a public bath.

The hot water supply unit 20 includes a first hot water pipe 22 provided with a first solenoid valve 21 and a second hot water pipe 22 connected in parallel to the first hot water pipe 22, And a second hot water pipe 24 provided with a second hot water pipe 24.

The cold water supply unit 30 includes a first cold water pipe 32 provided with a second solenoid valve 31 and a second cold water pipe 32 connected in parallel to the first cold water pipe 32, (Not shown).

At this time, the first hot water pipe (22) and the first cold water pipe (32) function as a main water pipe, and the second hot water pipe (24) and the second cold water pipe (34) It functions as an auxiliary water supply line in case.

In addition, in the present exemplary embodiment, the first and second solenoid valves 21 and 31 are configured as solenoid valves as an example, but the present invention is not limited thereto. Within the range for performing the function of opening and closing the 22 and the first cold water pipe 32, it can be preferably implemented using other known opening and closing member.

The first opening / closing valve 23 and the second opening / closing valve 33 are auxiliary opening / closing means, so that the solenoid valve or the conventional manual opening / closing valve can be used.

Hot water and cold water supplied through the hot water supply unit 20 and the cold water supply unit 30 are supplied to the bathtub unit 10 through the first and second water supply pipes 61a and 61b, In this embodiment, for example, the second water supply pipe (61b) is connected to the upper part of the bathtub unit (10).

The water level sensor unit 40 is installed inside the bathtub unit 10 and senses the level of water contained therein. The water level sensor unit 40 may be any one of well known water level sensors such as a floater type, an ultrasonic type, . ≪ / RTI >

In this embodiment, the water level sensor unit 40 may have different installation positions depending on the types of sensors. However, in this embodiment, for example, the upper surface of the bathtub unit 10, specifically, the water level of the bathtub unit 10 And the like.

The temperature sensor unit 50 includes a first temperature sensor 51 installed on the lower side wall of the bathtub unit 10 and a second temperature sensor 51 disposed on the wall surface of the bathtub unit 10 above the first temperature sensor 51. [ And a second temperature sensor 52, and may be preferably implemented using any one of ordinary temperature sensors capable of sensing water temperature.

It is preferable that the temperature sensor unit 50 is installed at a plurality of locations depending on the depth of the inner space of the bathtub unit 10 so that the temperature of the water in the bathtub unit 10 can be sensed according to the level of the water. The first and second temperature sensors 51 and 52 are installed on the lower part and the upper part of the bath part 10, respectively.

The automatic water dispenser 1 according to the present embodiment includes a first buffer container 60 provided between the first water supply pipe 61a and the second water supply pipe 61b, A first water circulation unit 70 for drawing out water and supplying the water to the first buffer container unit 60, and a second water circulation unit 70 for drawing out the water contained in the bathtub unit 10, A second water circulation part 80 and a drain part 90 for discharging the water inside the bath part 10 to the outside.

The first buffer container 60 includes a hermetically sealed container capable of receiving water therein. The hot water supplied from the hot water supply unit 20 and the cold water supply unit 30 through the first water supply pipe 61a, And serves to dilute the cold water and supply it to the bathtub section 10 through the second water pipe 61b.

The first water circulation unit 70 includes a first water circulation pipe 71 communicating with a drain pipe to be described later and a first circulation pump 72 installed midway between the first water circulation pipe 71 The first circulation pump 72 functions to supply the water in the tub portion 10 drawn out through the drain pipe to the first buffer container portion 60.

The automatic water supply device 1 of the present invention can be constructed such that water supplied through the hot water supply unit 20 and the cold water supply unit 30 is supplied to the first water circulation unit 70, The water in the bath part 10 supplied through the first buffer container 60 may be diluted in the first buffer container 60 and supplied to the bathtub part 10.

The first buffer container 60 includes a first water outlet 62 through which the water supplied from the hot water supply unit 20 and the cold water supply unit 30 flows and a second water outlet 62 through which the water supplied from the first water circulation unit 70 flows, The second inflow holes 63 are formed so as to face each other so that the dilution of water can be efficiently performed by the cross heat transfer effect.

In addition, each of the first and second water outlet holes 62 and 63 is provided with a nozzle device for spraying or directing water to be supplied, so that the above-described cross-heat transfer can be performed within a short time, .

The water diluted in the first buffer container 60 is discharged to the bathtub portion 20 by the water pressure of the water supplied from the hot water supply pipe 20 and the cold water supply pipe 30 and the driving force of the first circulation pump 72, 10).

In addition, a water softener 65 may be further installed in the middle of the first water supply pipe 61a or the second water supply pipe 61b to change the water supplied to the tub 10 into soft water as necessary. As an example, it installed in the middle of the 2nd water supply pipe 61a.

At this time, the water softener 65 can be preferably implemented using any one of known water softeners within the range of performing the same function as described above.

In addition, the second water circulation unit 80 removes the foreign matter by drawing the water in the tub 10 to the outside and raises the temperature by heating if necessary, and then supplies it to the tub 10 again. It is to.

The second water circulation unit 80 is connected to the upper side of the bathtub unit 10 to connect the first pipe 81 to draw water out of the bathtub unit 10 and to connect the lower part to the first pipe 81 A second water circulation pipe 83 connected to the upper portion of the filter 82 to supply water having passed through the filter 82 to the tub portion 10, A second circulation pump 84 installed in the middle of the second water circulation pipe 83 for circulating water through the first pipe 81 and the second water circulation pipe 83, 83) for heating the circulating water.

In addition, the drain portion 90 is connected to the drain pipe 91 of the lower portion of the tub 10, the drain valve 92 installed in the middle of the drain pipe 91, the tub 10 in the middle of the drain pipe 91 ) And a second buffer container portion 93 provided between the drain valve 92 and the drain valve 92.

Since the second buffer container 93 is configured to communicate with the first water circulation pipe 71 and the second water circulation pipe 83, the first water circulation unit 70 is connected to the drain pipe 91 The water in the tub portion 10 is drawn out through the first buffer container portion 93 and the first water circulation pipe 71 and supplied to the first buffer container portion 60.

The second water circulation unit 80 supplies the water drawn out through the first pipe 81 to the second water circulation pipe 83 through the second water circulation pipe 83, the second buffer container unit 93, So that the bath part 10 is pushed forward.

In this embodiment, the drain pipe 91, the first water circulation pipe 71 and the second water circulation pipe 83 are configured to communicate with each other through the second buffer container unit 93. However, And the drainage unit 90, the first water circulation unit 70, and the second water circulation unit 80 may be separately configured or may be configured to communicate with any other one as necessary.

The automatic water dispenser 1 of the present embodiment further includes an overflow pipe 95 connecting the upper wall of the bath part 10 and the lower drain pipe 91 of the drain valve 92 This is because when the water exceeds the full water level of the bath part 10 due to the error of the automatic water supply device or the buoyancy of the user, the water is naturally drained through the overflow pipe 95, To prevent overflow.

The second water circulation unit 80 includes a second pipe 86 communicating with the first pipe 81 and connecting the lower portion of the filter 82 to the overflow pipe 95, And a foreign matter discharge valve (87) installed in the middle of the discharge port (86).

Accordingly, the foreign substances contained in the water that has passed through the first pipe 81 are first collected in the second pipe 86 by their own weight before passing through the filter 82, When the foreign matter discharge valve 87 is opened, it can be discharged to the outside through the water discharge pipe 91 together with the water.

First, when the user sets the temperature of water to be supplied by the user through the input unit 110 and inputs a water supply start signal, the control unit 100 Operates the automatic water feeder 1 of the bathtub according to an operation program stored in advance in the memory unit 120. [

At this time, the controller 100 controls the first and second solenoid valves 21 and 22 using the level and the temperature inside the bathtub unit 10 detected by the water level sensor unit 40, the first and second temperature sensors 51 and 52, , 31, the auxiliary heater 85, and the first and second circulation pumps 72, 84, respectively.

3 shows another modified example of the automatic water supply device of the bathtub shown in Fig. 1. In this case, the top surface C of the space in which the bathtub portion 10 is provided, It is possible to further include an illumination device 15 for irradiating light to at least one of the wall surface W and the bottom surface F. [

The lighting device 15 functions to maintain various illuminations inside the space where the bathtub unit 10 is installed at a predetermined level, and to provide a variety of colors and patterns according to the needs of the user It is possible.

For this purpose, the illumination device 15 may be configured to selectively transmit light emitted from a light source (not shown) to form a pattern of color shadows on the surface to which the light is irradiated. For this purpose, (15) may be configured preferably using various known mood lamps or the like.

When the temperature setting and the water supply start signal are inputted from the user through the input unit 110, the controller 100 controls the automatic water supply apparatus 1 according to the first embodiment of the present invention, The low-temperature water supply is performed (S10, S20).

At this time, the low-temperature water supply is performed for a predetermined time according to a predetermined temperature. In the present embodiment, the low-temperature water supply is performed at a temperature of 20 degrees for several seconds to several minutes.

The reason why the low-temperature water supply is performed first is that high-temperature water is supplied at the beginning of the water supply so that the connection portion between the pipe, the bathtub portion 10, and the pipe portion and the bathtub portion 10 is exposed to the hot water to be damaged or deformed So that excessive cold water or hot water is suddenly introduced at the beginning of the water supply and the user located inside the bathtub 10 is prevented from being physically damaged.

Therefore, it is preferable that the temperature of the low-temperature water supply is set to be lower than the set temperature set by the user.

The control unit 100 controls the operation of the first and second solenoid valves 21 and 31 to supply water at a predetermined temperature to the hot water supply unit 20 and the cold water supply unit Closing time of the first and second solenoid valves 21 and 31 in consideration of the flow rate per unit time, the temperature of the hot water and the cold water, the volume of the tub portion 10, and the like, And a method of controlling the opening and closing times of the first and second solenoid valves 21 and 31 according to the temperature inside the bathtub 10 measured by the first and second solenoid valves 21 and 31.

In this embodiment, for convenience of explanation, the control unit 100 controls the open / close time of the predetermined first and second solenoid valves 21 and 31 to control the temperature of the water supplied during the low-temperature water supply do.

On the other hand, when the step S20 is completed, the controller 100 determines whether a predetermined low temperature water supply time has elapsed (S30). If the predetermined low temperature water supply time has not elapsed, the controller 100 continues to step S20. (S40).

When the step S40 is completed, the controller 100 performs a second-stage high-temperature water supply according to a predetermined method (S50), and the high-temperature water supply is also performed according to a predetermined temperature.

At this time, the water temperature of the high-temperature water may be set to be higher than the set temperature, and the water temperature inside the bathtub 10 may reach the set temperature immediately through the hot water. However, if necessary, The water temperature inside the bathtub unit 10 may reach the set temperature through the second water circulation unit 80 after the completion of the high temperature water supply, as will be described later.

The controller 100 controls the operations of the first and second solenoid valves 21 and 31 to supply water of a predetermined temperature to the hot water supply unit 20, Closing time of the first and second solenoid valves 21 and 31 determined in advance in consideration of the flow rate per unit time of the cold water supply unit 30, the temperature of the hot water and the cold water, the volume of the tub unit 10, and the like A method of appropriately controlling the opening and closing time of the first and second solenoid valves 21 and 31 according to the temperature inside the bathtub unit 10 measured by the temperature sensor unit 50 can be preferably implemented .

The hot water and the cold water supplied from the hot water supply unit 20 and the cold water supply unit 30 are supplied to the first buffer container unit 60 through the first water outlet hole 62, Is diluted.

In addition, the controller 100 controls the first circulation pump 72 so that the first diluted water in the first buffer container 60 is discharged to the second water outlet The water is diluted with water in the relatively low temperature bath part 10 injected through the holes 63, so that the water of appropriate temperature is always supplied into the bath part 10.

When the step S50 is completed, the controller 100 determines whether the water level of the water contained in the bathtub 10 has reached the set water level (i.e., the water level) (S60). If the water level has not reached the water level, And if it is reached, the high-temperature water supply is terminated (S70).

In this case, when the high-temperature water supply is terminated in step S70, the control unit 100 not only blocks the first and second solenoid valves 21 and 31 of the hot water supply unit 20 and the cold water supply unit 30, The operation of the unit 70 is also stopped.

When the step S70 is completed, the control unit 100 determines whether the water temperature in the bathtub unit 10 has reached the set temperature (S75). If the water temperature has reached the predetermined temperature, the control unit 100 terminates the control. The first circulation pump 85 and the second circulation pump 84 are operated to heat the water withdrawn from the tub portion 10 and re-supply the water to the tub portion 10 through the second water circulation portion 80 (S80).

When the water temperature has reached the set temperature in step S90, the control unit 100 continues the step S80 if the water temperature has not reached the preset temperature, The operation of the heater 85 and the second circulation pump 84 is stopped and the control is terminated (S100).

According to the above-described structure, the automatic water supply apparatus and control method for a bathtub according to the present invention can automatically adjust the water temperature and the water level of water supplied to the bathtub unit 10 by using the water level sensor unit 40 and the temperature sensor unit 50 The water temperature of the water to be supplied is gradually increased to maintain the water temperature set by the user so that damage or deformation of the pipe and the bathtub due to the supply of the initial high temperature water can be prevented.

In addition, the automatic water supply apparatus and control method of the bathtub according to the present invention may be configured such that the cold water and the hot water are completely diluted in the first buffer container unit 60 before being supplied to the bathtub unit 10, It is advantageous to prevent the physical damage caused by sudden exposure to cold water or hot water which has not been mixed.

10: bath part 20: hot water supply part
30: cold water supply unit 40: water level sensor unit
50: temperature sensor part 60: first buffer container part
70: first water circulation part 80: second water circulation part
90:

Claims (12)

Bath part;
A water supply unit supplying or blocking cold water and hot water to the bath tub; And
It includes a control unit for controlling the operation of the water supply unit so that the water temperature of the water accommodated in the bath is a set temperature,
The controller is configured to supply water of a first temperature lower than a set temperature to the bath unit first, and then supply water of a second temperature higher than the first temperature to the bath unit. . The method of claim 1,
The water supply unit includes a first opening and closing member installed in the hot water pipe, a second opening and closing member installed in the cold water pipe, and a water supply pipe for supplying hot water and cold water respectively supplied from the hot water pipe and the cold water pipe to the tub,
The control unit controls the operation of the first and second opening and closing member so that the water of the first temperature or the second temperature is supplied to the bathtub portion automatic water supply device of the bathtub. The method of claim 2,
Buffer container unit installed in the middle of the water supply pipe; And
It further comprises a first water circulation unit for extracting the water contained in the bath portion to supply to the buffer container,
When the control unit supplies water at a second temperature, the first water circulation is performed so that the water supplied from the water supply unit and the water supplied from the first water circulation unit are diluted with each other in the buffer container and supplied to the bath unit. Automatic water supply device of the bathtub, characterized in that for controlling the operation of the negative. The method of claim 3,
Wherein the buffer container portion is formed such that a first water outlet hole through which water supplied from the water supply portion flows and a second water outlet hole through which water supplied from the first water circulation portion flows are opposed to each other. 5. The method of claim 4,
Wherein a nozzle device for spraying water is formed in each of the first water discharging hole and the second water discharging hole. 6. The method according to any one of claims 1 to 5,
And a water level sensor unit installed inside the bathtub unit for sensing the level of water contained therein,
Wherein the control unit controls the water supply unit such that supply of hot water and cold water is interrupted when the water level sensed by the water level sensor unit reaches a predetermined water level. The method according to claim 6,
A temperature sensor unit installed inside the bathtub unit for sensing water temperature of the water contained therein;
Further comprising a second water circulation unit for drawing out the water contained in the bathtub unit, heating the water, and re-supplying the heated water to the bathtub unit,
Wherein the control unit operates the second water circulation unit when the water temperature sensed by the temperature sensor unit is lower than the set temperature after the supply of hot water and cold water is cut off. The method of claim 7, wherein
The second water circulation unit may include a circulation pump for circulating water in the tub part through an external water circulation pipe, an auxiliary heater installed in the middle of the water circulation pipe for heating the circulated water, And a filtration device installed in the middle to remove foreign substances contained in the circulated water. 9. The method of claim 8,
Further comprising a water softener installed between the water supply part and the bathtub part to change water supplied to the bathtub part into soft water. 9. The method of claim 8,
Wherein the bathtub part comprises a bathtub in which water is accommodated and an illumination device provided on one side of the rim of the bathtub,
Wherein the illumination device selectively transmits light emitted from the light source so that a pattern is formed on a surface irradiated with the light. A first step of supplying water of a first temperature lower than a set temperature set by a user to the bath through a water supply unit;
A second step of supplying water to the bath through the water supply unit at a second temperature higher than the first temperature so that the water temperature of the water contained in the bath becomes a predetermined temperature;
A third step of shutting off the water supply when the water contained in the bath reaches the set water level; And
When the water temperature inside the bath measured after the water supply is cut in the third step is lower than the set temperature, the fourth step of taking out the water contained in the bath and heating it and re-supply to the bath. Automatic water supply control method of the bathtub. The method of claim 11,
Wherein the second step comprises diluting the water withdrawn from the bath with water at a second temperature supplied from the water supply unit and supplying the diluted water to the bath.

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