REFRIGERATOR WITH WATER TANK

A refrigerator includes: a main body, a door rotationally or slidably installed at a front of the main body, at least one storage chamber configured to store items, a water tank arranged in the at least one storage chamber and configured to store water to be supplied to at least one water supply system, a water detection sensor configured to detect the water stored in the water tank, and at least one processor configured to, when the water stored in the water tank is detected for at least a certain period of time by the water detection sensor, control a first pump to discharge the water stored in the water tank onto an evaporation tray under a condenser in a machine room by using a discharge path for defrost water.

TECHNICAL FIELD

The disclosure relates to a refrigerator with a water tank.

BACKGROUND ART

The refrigerator is a device for keeping foods or medicines at low temperature or at a proper usage temperature to prevent them from going bad. In general, the refrigerator may use a refrigeration cycle comprised of a compressor, a condenser, an expansion valve and an evaporator to refrigerate and store the foods.

Recently, refrigerators are sometimes equipped with an ice maker that automatically produces ice. The user has supplied water to the ice maker in person in the past, but recently developed refrigerators are able to automatically supply water to the ice maker themselves. Refrigerators having this water supply function may be largely divided into a plumbing type and a non-plumbing type. The plumbing type receives water from an external water pipe, and the non-plumbing type includes a water tank inside, requiring the user to supply water into the water tank in person.

The non-plumbing type is more suitable for a structure that has difficulty in connecting the external water pipe to the refrigerator than the plumbing type. Furthermore, as compared to the plumbing type, the non-plumbing type has an advantage of being simple in structure and free in movement (e.g., moving or changing the location of the refrigerator).

DISCLOSURE

Technical Solution

According to an embodiment of the disclosure, a refrigerator includes a main body; a door rotationally or slidably installed at a front of the main body; at least one storage chamber for storing items; a water tank arranged in the at least one storage chamber and configured to store water to be supplied to at least one water supply system; a water detection sensor configured to detect the water stored in the water tank; and at least one processor configured to control a first pump to discharge water stored in the water tank onto an evaporation tray under a condenser in a machine room through a discharge path for defrost water, when the water stored in the water tank is detected by a water detection sensor for at least a certain period of time.

According to an embodiment of the disclosure, a refrigerator includes a main body; a door rotationally or slidably installed at a front of the main body; at least one storage chamber configured to store items; a water tank arranged in the at least one storage chamber and configured to store water to be supplied to at least one water supply system; a water detection sensor configured to detect the water stored in the water tank; and at least one processor configured to, when the water stored in the water tank is detected for at least a certain period of time by the water detection sensor and an operation of a user who uses the refrigerator is detected, output an alert to empty the water tank through at least one of user equipment connected to a server device, a display or a speaker.

DETAILED DESCRIPTION

Terms as used herein will be described before detailed descriptions of an embodiments of the disclosure are provided.

The terms are selected as common terms that are currently widely used, taking into account principles of the disclosure, which may however depend on intentions of those of ordinary skill in the art, judicial precedents, emergence of new technologies, and the like. Some terms as used herein are selected at the applicant's discretion, in which case, the terms will be explained later in detail in connection with embodiments of the disclosure. Therefore, the terms should be defined based on their meanings and descriptions throughout the disclosure.

The term “include (or including)” or “comprise (or comprising)” is inclusive or open-ended and does not exclude additional, unrecited elements or method steps. The terms “unit”, “module”, “block”, etc., as used herein each represent a unit for handling at least one function or operation, and may be implemented in hardware, software, or a combination thereof.

An embodiment of the disclosure will now be described in detail with reference to accompanying drawings so as to be readily practiced by those of ordinary skill in the art. However, an embodiment of the disclosure may be implemented in many different forms, and is not limited to that discussed herein. In the drawings, parts unrelated to the description are omitted for clarity, and like numerals refer to like elements throughout the specification.

In an embodiment of the disclosure, a refrigerator may include a main body.

The main body may include an inner casing, an outer casing arranged on the outside of the inner casing, and insulation arranged between the inner casing and the outer casing.

The inner casing may include at least one of a case, a plate, a panel or a liner, which defines a storage chamber. The inner casing may be formed in one body unit or may be formed by assembling multiple plates. The outer casing may define the exterior of the main body, and may be coupled to the outside of the inner casing such that the insulation is placed between the inner casing and the outer casing.

The insulation may insulate inside and outside of the storage chamber so that the temperature in the storage chamber is maintained at a set suitable temperature without being influenced by external environments of the storage chamber. In an embodiment of the disclosure, the insulation may include foam insulation. The foam insulation may be formed by injecting and foaming urethane foam made of a mixture of polyurethane and a foam agent between the inner casing and the outer casing.

In an embodiment of the disclosure, the insulation may include an additional vacuum insulation in addition to the foam insulation, or may include only the vacuum insulation instead of the foam insulation. The vacuum insulation may include a core material and an outer cover material that accommodates the core material and seals the inside at vacuum pressure or almost vacuum pressure. The insulation is not, however, limited to the foam insulation or vacuum insulation, but may include various materials that may be used for insulation.

The storage chamber may include a space defined by the inner casing. The storage chamber may further include an inner casing that defines the space corresponding to the storage chamber. Various items such as foods, medicines, cosmetics, etc., may be stored in the storage chamber, and the storage chamber may be formed with one side open to put in or take out the items.

The refrigerator may include one or more storage chambers. When there are two or more storage chambers formed in the refrigerator, each storage chamber may have a different use and may be maintained at a different temperature. For this, the storage chambers may be separated by partition walls including insulation.

The storage chambers may be provided to be each maintained at a suitable temperature range, and may include a fridge, a freezer or a temperature-changing room classified by the use and/or the temperature range. The fridge may be maintained at a suitable temperature for keeping items refrigerated, and the freezer may be maintained at a suitable temperature for keeping items frozen. Refrigeration may refer to cooling the items to an extent that the items are not frozen, and for example, the fridge may be maintained at a range of 0 to 7 degrees Celsius above zero. Freezing may refer to freezing the items or cooling the items in a frozen state, and for example, the freezer may be maintained at a range of 20 to 1 degree Celsius below zero. The temperature-changing room may be used as one of the fridge or the freezer according to or regardless of the user's choice.

The storage chambers may be called many different names such as “veggie room”, “fresh room”, “cooling room” and “ice-making room” in addition to the names such as “fridge chamber”, “freezer chamber” and “temperature-changing room”, and the terms such as “fridge chamber”, “freezer chamber” and “temperature-changing room” need to be understood as encompassing storage chambers having respective uses and temperature ranges.

In an embodiment of the disclosure, the refrigerator may include at least one door arranged to open or close the one open side of the storage chamber. A door may be equipped to open or close each of the one or more storage chambers, or one door may be equipped to open or close multiple storage chambers. The door may be rotationally or slidably installed at the front of the main body.

The door may be arranged to close the storage chamber tight when closed. Like the main body, the door may include insulation to insulate the storage chamber when closed.

In an embodiment of the disclosure, the door may include a door outer-plate that forms the front surface of the door, a door inner-plate that forms the rear surface of the door and faces the storage chamber, an upper cap, a lower cap and door insulation provided inside of them.

A gasket may be arranged on edges of the door inner-plate to seal the storage chamber by tightly contacting the front surface of the main body when the door is closed. The door inner-plate may include a dyke that protrudes rearward for a door basket that may keep items to be installed thereon.

In an embodiment of the disclosure, the door may include a door body and a front panel detachably coupled to the front side of the door body and forming the front of the door. The door body may include a door outer-plate that forms the front surface of the door body, a door inner-plate that forms the rear surface of the door body and faces the storage chamber, an upper cap, a lower cap and door insulation provided inside of them.

The refrigerator may be distinguished according to the layout of the door(s) and storage chamber(s) as a French door type, a side-by-side type, a bottom mounted freezer (BMF), a top mounted freezer (TMF) or a one-door refrigerator.

In an embodiment of the disclosure, the refrigerator may include a cold air supplier arranged to supply cold air into the storage chamber.

The cold air supplier may include a machine, instrument, electronic device and/or system that combines them, which is able to produce and lead cold air to cool the storage chamber.

In an embodiment of the disclosure, the cold air supplier may produce the cold air through a refrigeration cycle including processes of compression, condensation, expansion and evaporation of a refrigerant. For this, the cold air supplier may include a refrigeration cycle system having a compressor, a condenser, an expansion device and an evaporator that may operate the refrigeration cycle. In an embodiment of the disclosure, the cold air supplier may include semiconductors such as thermoelectric elements. The thermoelectric element may cool the storage chamber by heating and cooling actions through the Peltier effect.

In an embodiment of the disclosure, the refrigerator may include a machine room arranged for at least some parts belonging to the cold air supplier to be placed therein.

The machine room may be separated and insulated from the storage chamber to prevent heat generated from the parts arranged in the machine room from being transmitted to the storage chamber. To emit heat from the parts arranged in the machine room, the inside of the machine room may be formed to connect to the outside of the main body.

In an embodiment of the disclosure, the refrigerator may include a dispenser arranged at the door to provide water and/or ice. The dispenser may be located at the door for the user to make access thereto without a need to open the door.

In an embodiment of the disclosure, the refrigerator may include an ice maker provided to produce ice. The ice maker may include an ice maker tray for storing water, an ice separator for separating ice from the ice maker tray, and an ice bucket for storing ice produced from the ice maker tray.

In an embodiment of the disclosure, the refrigerator may include a controller for controlling the refrigerator.

The controller may include a memory for storing or memorizing a program and/or data for controlling the refrigerator, and a processor for outputting control signals to control components such as the cold air supplier according to the program and/or data stored in the memory.

The memory stores or records various information, data, instructions, programs, etc., required for operation of the refrigerator. The memory may store temporary data that is generated while the control signals to control the components included in the refrigerator are being generated. The memory may include at least one or a combination of volatile memories or non-volatile memories.

The processor controls general operation of the refrigerator. The processor may control the components of the refrigerator by executing the program stored in the memory. The processor may include an extra neural processing unit (NPU) that performs operation of an artificial intelligence (AI) model. The processor may also include a central processing unit (CPU), a graphic processing unit (GPU), etc. The processor may generate control signals to control operation of the cold air supplier. For example, the processor may receive information about the temperature in the storage chamber from a temperature sensor, and generate a refrigeration control signal to control an operation of the cold air supplier based on the temperature information of the storage chamber.

Furthermore, the processor may process a user input to a user interface according to the program and/or data memorized/stored in the memory, and control operation of the user interface. The user interface may be provided by using an input interface and an output interface. The processor may receive the user input from the user interface. Furthermore, the processor may send a display control signal and image data for displaying an image on the user interface to the user interface in response to the user input.

The processor and the memory may be provided in one unit or separately. The processor may include one or more processors. For example, the processor may include a main processor and at least one subprocessor. The memory may include one or more memories.

In an embodiment of the disclosure, the refrigerator may include a processor and a memory for controlling all the components included in the refrigerator, or include a plurality of processors and a plurality of memories for controlling the components of the refrigerator, respectively. For example, the refrigerator may include a processor and a memory for controlling operation of the cold air supplier according to the output of the temperature sensor. The refrigerator may include another processor and another memory for controlling operation of the user interface according to the user input.

A communication module (communication interface) may communicate with an external device such as a server, a mobile device, another home appliance, etc., through a nearby access point (AP). The AP may connect a local area network (LAN) connected to the refrigerator or user equipment to a wide area network (WAN) connected to the server. The refrigerator or user equipment may be connected to the server through the WAN.

The input interface may include a key, a touch screen, a microphone, etc. The input interface may receive a user input and forward it to the processor.

The output interface may include a display, a speaker, etc. The output interface may output various notifications, alert, messages, information, etc., generated by the processor.

A refrigerator according to various embodiments will now be described in detail in connection with the accompanying drawings.

FIG.1is a diagram for describing a water supply system of a refrigerator1000, according to an embodiment of the disclosure.

Referring toFIG.1, the refrigerator1000may include a water tank1100for storing water to be supplied to at least one water supply system. The water tank1100may be located in a certain space of a fridge chamber. The water tank1100may be located between storage chambers (e.g., multi-pantries) or at a side of a storage chamber.

A maximum amount of water to be stored in the water tank1100may be about 4.5l, but is not limited thereto. As the water is supplied to the at least one water supply system, the amount of water stored in the water tank1100may be reduced.

The water supply system is a device that operates with water received from the water tank1100, and may include, for example, at least one of an ice maker1200, an autofill device1300or a dispenser1400without being limited thereto. Depending on the product model, the refrigerator1000may include only the ice maker1200or may include all the ice maker1200, the autofill device1300and the dispenser1400.

The ice maker1200may include an ice maker tray on which water for ice making is stored and ice is made, an ice separator for separating the ice made on the ice maker tray, an ice separation motor for rotating the ice separator, an ice maker cover for leading ice separated from the ice maker tray to an ice storage (hereinafter, referred to as an ice storage container), a slider for preventing the ice separated from the ice maker tray from returning to the ice maker tray, etc., without being limited thereto. The ice maker tray may include a plurality of ice maker cells, and when the water stored in the water tank1100is supplied to the ice maker tray, each of the ice maker cells may store the water for ice making. The ice separator is arranged over the ice maker tray, and may separate ice from the ice maker tray after the ice is made. The ice separation motor generates rotational force to rotate the ice separator clockwise or counterclockwise.

The autofill device1300may include a small water tank for storing automatically supplied water. The small water tank may also be called an autofill water tank. The user may take out the small water tank from the refrigerator1000to drink cool water. The small water tank included in the autofill device1300may include an infuser into which a teabag may be put.

The autofill device1300may include a water tank sensor for detecting whether the small water tank (autofill water tank) is mounted, and a water level sensor for detecting a water level in the small water tank. When the water tank sensor detects that the small water tank is mounted, water may be automatically supplied into the autofill device1300from the water tank1100so that the small water tank is filled with a certain amount of water. When the water tank sensor detects that the small water tank (autofill water tank) is not mounted, water supply from the water tank1100into the autofill device1300may be blocked.

In the meantime, when the water tank sensor detects that the certain amount of water is stored in the small water tank (autofill water tank), water supply from the water tank1100into the autofill device1300may be blocked. On the other hand, when the water tank sensor detects that the certain amount of water is not stored in the small water tank (autofill water tank), water may be supplied into the autofill device1300from the water tank1100. When the autofill function is activated, the at least one processor of the refrigerator1000may control the water supply pump to maintain the certain amount of water in the small water tank (autofill water tank).

The dispenser1400may be a device for providing purified water and/or ice. The dispenser1400may include a water collection space and an operation lever. The dispenser1400may supply water into the water collection space in response to a manual operation of the operation lever. For example, when the user presses the operation lever, the at least one processor of the refrigerator1000may control the water in the water tank1100to be supplied into the dispenser1400so that the water may flow into the water collection space through a nozzle of the dispenser1400.

As the water supply system (e.g., the ice maker1200, the autofill device1300or the dispenser1400) is a device that operates with water received from the water tank1100, the water tank1100needs to be filled with water for the user to use the water supply system. Hence, the user may fill the water tank1100with water when there is no water in the water tank1100. For example, referring to110ofFIG.1, the user may open a water inlet cover located on the top of the water tank1100and pour water into the water tank1100through a water inlet.

When the user does not use the water supply system for a long time after storing water in the water tank1100, the water stored in the water tank1100may be contaminated. For example, referring to120ofFIG.1, when the water in the water tank1100does not flow out of the water tank1100for a long time, the remaining water goes moldy or the water tank1100or a hose is incrusted with slime, which may be insanitary.

Hence, according to an embodiment of the disclosure, when detecting that water in the water tank1100has not been discharged for at least a certain period of time with the use of a water detection sensor for detecting water in the water tank1100, the refrigerator1000may control the pump to discharge the water of the water tank1100onto an evaporation tray in the machine room such that the water may be naturally evaporated from the evaporation tray. In this case, the refrigerator1000discharges the water from the water tank1100onto the evaporation tray through a discharge path for defrost water, so there is no need to significantly change the device structure.

In an embodiment of the disclosure, the refrigerator1000may first determine whether the water supply system is possible to receive water before discharging water from the water tank1100onto the evaporation tray. When there is a room to receive water in the water supply system, the refrigerator1000may discharge the remaining water onto the evaporation tray in the machine room after supplying water into the water supply system first.

In other words, in an embodiment of the disclosure, the refrigerator1000may force the water stored in the water tank1100to be discharged into the water supply system or onto the evaporation tray after a lapse of a certain period of time in order to prevent contamination or proliferation due to the remaining water or stagnant water. The operation of the refrigerator1000forcing the water stored in the water tank1100to be discharged will be described later in detail with reference toFIG.7.

In the meantime, when the pump operates to supply water into the water supply system while there is no water in the water tank1100after the water tank1100is emptied, the pump motor is rapidly heated so that it is more likely to be short-lived or damaged. For example, when the user presses the operation lever of the dispenser1400or activates the ice making function and/or autofill function while there is no water in the water tank1100, the refrigerator1000may automatically try water supplying into the dispenser1400, the ice maker1200or the autofill device1300, making the pump motor broken or damaged and causing the noise of the pump motor to grow louder. Hence, in an embodiment of the disclosure, the refrigerator1000may detect that there is no water in the water tank1100and notify the user of this, prompting the user to fill the water tank1100with water. The operation of the refrigerator1000providing alert to replenish the water tank1100with water will be described later in detail with reference toFIG.18.

The water tank1100and the water detection sensor for detecting water stored in the water tank1100will now be described in more detail in connection withFIGS.2to5.

FIG.2is a diagram for describing the water tank (1100) and a water detection sensor1500, according to an embodiment of the disclosure.FIG.3is a diagram for describing bottom shapes of the water tank100, according to an embodiment of the disclosure.FIG.4is a diagram for describing a position of the water detection sensor1500, according to an embodiment of the disclosure.

Referring toFIG.2, in an embodiment of the disclosure, the refrigerator1000may include the water tank1100, the water detection sensor1500and at least one processor1600, but is not limited thereto. The refrigerator1000may be implemented with more components than shown inFIG.2.

The respective components will now be described.

The water tank1100may include a body1101, a top cover1102, a water inlet cover1103, a gasket1104, a hose1105, a filter1106, etc., without being limited thereto. The body1101may include a storage room for storing water. The storage room may receive up to 4.5of water, but is not limited thereto.

The water inlet cover1103may be arranged in a portion of the top cover1102. The user may fill the storage room with water by opening the water inlet cover1103and pouring water through the water inlet. The gasket1104may be a sealing gasket for coupling the water tank body1101with the top cover1102.

The hose1105may be a tube for supplying water into the water supply system. The hose1105may be provided in the plural depending on the type of the water supply system. For example, the hose1105may include a first hose for supplying water into the ice maker1200and a second hose for supplying water into the autofill device1300or the dispenser1400, but is not limited thereto. In an embodiment of the disclosure, the hose1105may include a third hose (also referred to as a water tank hose) for discharging water onto a drain plate of an evaporator. Hereinafter, the hose1105may also be referred to as a nozzle.

The filter1006is to filter out foreign materials in the water stored in the water tank1100. When there are the plurality of hoses1105, the filter1106may be provided in the plural as well.

The water detection sensor1500may be a sensor for detecting water stored in the water tank1100. The water detection sensor1500may also be referred to as a water level sensor. The water detection sensor1500may be a non-contact type sensor or a contact type sensor. The non-contact type sensor may include a capacitive sensor or a weight detection sensor, without being limited thereto. A case that the water detection sensor1500is the weight detection sensor (e.g., a load cell) will be described later with reference toFIG.5, and a case that the water detection senor1500is the capacitive sensor will be described with reference toFIGS.2to4.

The water detection sensor1500may be arranged at a location corresponding to a bottom portion of the water tank1100. In an embodiment of the disclosure, when there is a step on the bottom of the water tank1100, the water detection sensor1500may be arranged at a location corresponding to a lowest part of the bottom portion of the water tank1100.

Referring toFIG.3, the inside of the bottom portion of the water tank1100may have various shapes, so that the remaining water in the water tank1100is minimized and even when the amount of the remaining water in the water tank1100is so small, the remaining water can be detected to reduce false detection for the water in the water tank1100. For example, the inside of the bottom of the water tank1100may be sloped (e.g.,310,320and330), spherical (e.g.,340), convex-downward (e.g.,340,350and360), or funnel-shaped (330and360), without being limited thereto if an area of the inside of the bottom portion on a plane of which the normal direction is parallel to the gravity direction is smaller than an area of the inside of other portions of the water tank1100. By arranging the water detection sensor1500at a location corresponding to the lowest of the bottom portion of the water tank1100, false detection for the remaining water in the water tank1100may be minimized.

Referring toFIG.4, the water detection sensor1500may be arranged at a lower end310of a first surface that comes into contact with the rear side of the water tank1100when the water tank1100is mounted in the refrigerator1000. The water detection sensor1500arranged at the lower end310of the first surface may identify whether there is water in the water tank1100accommodated in the refrigerator1000by detecting a change in capacitance. The water detection sensor1500may send a signal indicating that water is detected in the water tank1100or a signal indicating that water is not detected in the water tank1100to the at least one processor1600. When the water detection sensor1500detects no water, it may mean that there is no remaining water in the water tank1100as the water detection sensor1500is arranged at a location corresponding to the lowest of the bottom of the water tank1100. On the other hand, when the water detection sensor1500detects water, it may mean that there is remaining water in the water tank1100.

Turning back toFIG.2, the refrigerator1000may include at least one processor1600. The refrigerator1000may include one or multiple processors. For example, the refrigerator1000may include a main processor and a subprocessor. The at least one processor1600may control general operation of the refrigerator1000. For example, when water stored in the water tank1100is detected for at least a certain period of time by the water detection sensor1500, the at least one processor1600may control the pump to discharge the water stored in the water tank1100onto the evaporation tray under the condenser in the machine room by using a discharge path for defrost water. The operation of the at least one processor1600using the discharge path for defrost water to discharge water stored in the water tank1100onto the evaporation tray will be described later in detail with reference toFIG.7.

In the disclosure, the at least one processor1600may include at least one of a central processing unit (CPU), a graphics processing unit (GPU), an accelerated processing unit (APU), many integrated cores (MIC), a digital signal processor (DSP) or a neural processing unit (NPU). The at least one processor1600may be implemented in the form of a system on chip (SoC) with one or more electronic components integrated therein. Each of the at least one processor1600may be implemented in separate hardware (H/W). The at least one processor1600may also be referred to as a micro-computer, microprocessor computer or microprocessor controller (MICOM), a micro processor unit (MPU), or a micro controller unit (MCU).

In the disclosure, the at least one processor1600may be implemented with a single core processor or a multi-core processor.

The water detection sensor1500of the weight detection type will now be described in connection withFIG.5.

FIG.5is a diagram for describing the water detection sensor1500, according to an embodiment of the disclosure.

Referring toFIG.5, the water detection sensor1500may include a weight detection sensor1501. Hereinafter, the weight detection sensor1501may also be referred to as a load cell.

The weight detection sensor1501may be arranged at a location where the bottom side of the water tank1100is settled when the water tank1100is accommodated in the refrigerator1000. Hence, the bottom side of the water tank1100may be designed to have a structure that may tightly contact the weight detection sensor1501(e.g., load cell). The weight detection sensor1510may detect whether there is water in the water tank1100by detecting the weight of the water tank1100that stores water.

The weight detection sensor1501may send a signal indicating that water is detected in the water tank1100or a signal indicating that water is not detected in the water tank1100to the at least one processor1600.

In the meantime, although not shown inFIGS.2to5, a distance detection sensor may be arranged at the top cover1102. In this case, the distance detection sensor may identify a change in water level in the water tank1100by measuring a distance from the top cover1102to the water stored in the water tank1100. The distance detection sensor may include at least one of a photo sensor (e.g., a time of flight (ToF) sensor), a position sensitive device (PSD), a lidar sensor or an ultrasonic sensor, but is not limited thereto.

FIG.6is a diagram for describing a system for discharging water from the water tank1100, according to an embodiment of the disclosure.

The water tank1100may be connected to the autofill device1300, the dispenser1400, the ice maker1200or an evaporator1700through internal pipes.

When the autofill function is activated, the at least one processor1600of the refrigerator1000may control a water pump610to maintain a certain amount of water in the autofill device1300. For example, when water is not filled up to a reference line of the small water tank included in the autofill device1300, the at least one processor1600of the refrigerator1000may operate the water pump610. In this case, the water stored in the water tank1100may be supplied to the autofill device1300through an autofill valve611. Hereinafter, a state in which water is filled up to the reference line of the small water tank may be referred to as ‘being full of water’.

The at least one processor1600of the refrigerator1000may control the water pump610to supply water to the dispenser1400according to the user's lever operation. For example, when the user presses the lever, the at least one processor1600of the refrigerator1000may operate the water pump610. In this case, the water stored in the water tank1100may be supplied to the dispenser1400through a dispenser valve612.

The at least one processor1600of the refrigerator1000may control an ice pump620to maintain a certain amount of ice in the ice storage container, when an automatic ice making function is activated. For example, when less than the certain amount of ice is filled in the ice storage container, the at least one processor1600of the refrigerator1000may operate the ice pump620. In this case, the water stored in the water tank1100may be supplied onto the ice maker tray. Hereinafter, a state in which ice is filled up to the maximum capacity in the ice storage container may be referred to as ‘being full of ice’.

When water of the water tank1100is not discharged for at least a certain period of time, the at least one processor1600of the refrigerator1000may control an evaporator pump630to discharge the water of the water tank1100onto an evaporation tray1801in a machine room1800through a discharge path for defrost water. For example, when the water of the water tank1100remains in the water tank1100for at least a certain period of time (e.g., 30 hours) without being supplied into the ice maker1200, the autofill device1300or the dispenser1400, the at least one processor1600of the refrigerator1000may operate the evaporator pump630to discharge the water of the water tank1100onto the evaporation tray1801under the condenser1802in the machine room1800through a drain plate of the evaporator1700. The water discharged onto the evaporation tray1801may be naturally evaporated by heat generated from the condenser1802and wind produced by an air blowing fan1803.

Hereinafter, the evaporator pump630may be referred to as a first pump, the ice pump620a second pump, and the water pump610a third pump.

Referring toFIG.7, the operation of the refrigerator1000discharging the remaining water in the water tank1100onto the evaporation tray1801in the machine room1800through a discharge path for defrost water will now be described in more detail.

FIG.7is a diagram for describing a system for discharging water from the water tank1100onto the evaporation tray1801, according to an embodiment of the disclosure.

When the water stored in the water tank1100is detected for at least a certain period of time by the water detection sensor1500, the refrigerator1000may control the first pump to discharge the water stored in the water tank1100onto the evaporation tray1801under the condenser1802in the machine room1800by using a discharge path for defrost water.

The discharge path for defrost water may include a drain tube1720connected from a drain plate1710under the evaporator1700to the evaporation tray1801in the machine room1800. The drain tube1720may also be referred to as a drain hose. The drain tube1720may be formed as a corrugated hose with circular pleats or may be formed as a corrugated hose with spiral pleats.

The drain tube1720may be arranged as one or multiple sections. The drain tube1720may lead defrost water produced in the evaporator1700to be moved to the machine room1800. The defrost water may be moved to the bottom side of the machine room1800through the drain tube1720. The evaporation tray1801, to which the defrost water flows in, may be located on the bottom side of the machine room1800.

The machine room1800may include a compressor1804, the condenser1802and the air blowing fan1803, without being limited thereto. The compressor1804compresses the refrigerant into a high temperature and high pressure state. The compressor1804may compress a refrigerant gas to have high temperature and high pressure by using the rotational force of the electric motor after receiving external electric energy. The compressor1804may be connected to the condenser1802to move the compressed refrigerant to the condenser1802. The compressor1804operates a refrigeration cycle of compression, condensation and evaporation by compressing and pushing the refrigerant into the condenser1802. Accordingly, with the operation of the compressor1804, the cold air produced in the evaporator1700is supplied into the storage chamber.

The condenser1802condenses the high temperature and high pressure refrigerant compressed from the compressor1804. The condenser1802may emit heat generated while condensing the refrigerant. The refrigerant condensed while passing through the condenser1802is moved to the expansion valve. The refrigerant condensed in the condenser1802turns into a low temperature and low pressure liquid state while passing through the expansion valve. The refrigerant liquid passes through the expansion valve and is moved to the evaporator1700.

The evaporator1700evaporates the low temperature and low pressure refrigerant liquid that has passed through the expansion valve. In the evaporator1700, the refrigerant liquid exchanges heat with surrounding air while being evaporated. The refrigerant liquid absorbs surrounding latent heat, causing the air around the evaporator1700to be cooled and thus producing cold air. The completely evaporated refrigerant is supplied back to the compressor1804, going through the refrigeration cycle. A heater may be arranged around the evaporator170to remove frost formed on the evaporator1700.

Referring toFIG.7, a water tank hose1110for discharging water from the water tank1100may be connected to the drain plate1710under the evaporator1700. The drain plate1710under the evaporator1700may be a plate where defrost water produced while the heater around the evaporator1700operates is collected. The drain plate1710may include a drain hole1711.

The at least one processor1600of the refrigerator1000may operate the first pump (evaporator pump)630to move the water in the water tank1100to the drain plate1710under the evaporator1700through the water tank hose1110. The water tank1100may be located lower than the evaporator1700. The water discharged from the water tank1100to the drain plate1710through the water tank hose1110may flow into the drain tube1720through the drain hole1711of the drain plate1710and arrive at the evaporation tray1801. In other words, the remaining water in the water tank1100may be discharged onto the evaporation tray1801in the machine room1800by using the discharge path for the defrost water. Accordingly, in an embodiment of the disclosure, when the water in the water tank1100is not used for a long time, the at least one processor1600of the refrigerator1000may prevent the water tank1100from being contaminated by e.g., mold by discharging the remaining water in the water tank1100onto the evaporation tray1801.

The water discharged onto the evaporation tray1801may be naturally evaporated by the heat generated from the condenser1802and wind produced by the air blowing fan1803. Accordingly, user convenience may increase because there is no need for the user to throw away the water collected on the evaporation tray1801.

In an embodiment of the disclosure, the at least one processor1600of the refrigerator1000may control revolutions per minute (rpm) of the air blowing fan1803in the machine room1800to a maximum level as the water stored in the water tank1100is discharged onto the evaporation tray1801. In the case that the rpm of the air blowing fan1803is controlled to the maximum level, the water discharged onto the evaporation tray1801may be evaporated more quickly.

A way that the at least one processor1600of the refrigerator1000determines a time to discharge or amount of discharging water stored in the water tank1100will now be described in detail with reference toFIG.8.

FIG.8is a flowchart for describing a method of determining a time to discharge or amount of discharging water stored in the water tank1100, according to an embodiment of the disclosure.

In operation S810, the refrigerator1000may detect with the water detection sensor1500the water stored in the water tank1100for at least a certain period of time.

For example, when the water detection sensor1500arranged at a location corresponding to a lowest part of the bottom portion of the water tank1100continues to detect water for at least a certain period of time (e.g., 24 hours), the at least one processor1600of the refrigerator1000may determine that the water has not been completely discharged from the water tank1100and has been stored there for a long time (e.g., at least 24 hours). In this case, the at least one processor1600of the refrigerator1000may determine that the water needs to be discharged from the water tank1100onto the evaporation tray1801to prevent contamination of the water tank1100or the water in the water tank1100.

In operation S820, the refrigerator1000may determine a time to discharge the water stored in the water tank1100in consideration of discharging intervals of defrost water.

In an embodiment of the disclosure, the water in the water tank1100is discharged onto the evaporation tray1801through the discharge path for defrost water, so the time to discharge the water stored in the water tank1100may be determined by taking into account the discharging intervals of the defrost water. In other words, the at least one processor1600of the refrigerator1000may control a time to operate the defrost heater and a time to operate the first pump630to discharge the remaining water from the water tank1100not to overlap each other. For example, the at least one processor1600of the refrigerator1000may operate the defrost heater and the first pump630alternately, but is not limited thereto.

Referring to a graph910ofFIG.9, the refrigerator1000may discharge the defrost water every three days on average. In other words, the at least one processor1600of the refrigerator1000may discharge the defrost water by operating the defrost heater every three days. Referring to a table920ofFIG.9, an initial defrost amount may be about 500 g, but the subsequent defrost amount may dwindle down to about 110 g after third defrosting. Water has not been stored for at least a certain period of time in the initial stage, so when to discharge the remaining water does not matter, but after second defrosting, the defrost amount is not much and the defrost water may be evaporated from the evaporation tray1801within 24 hours. Accordingly, the at least one processor1600of the refrigerator1000may operate the first pump630to discharge the remaining water from the water tank110024 hours after operating the defrost heater, in consideration of the discharging intervals of the defrost water.

In the meantime, after the third defrosting, the defrost amount is not much but about 110 g, so when the amount to be discharged onto the evaporation tray1801at once is determined to be small, the refrigerator1000may determine a time to discharge the remaining water without much consideration for the defrost intervals. In this case, operation S820may be skipped.

In operation S830, the refrigerator1000may determine an available amount of water to be discharged at once based on the capacity of the evaporation tray1801.

In an embodiment of the disclosure, the capacity of the water tank1100may be greater than that of the evaporation tray1801. In this case, when the water stored in the water tank1100is discharged at once to the evaporation tray1801, the water may overflow in the machine room1800, so the at least one processor1600of the refrigerator1000may determine an available amount of water to be discharged at once based on the capacity of the evaporation tray1801.

For example, when the capacity of the evaporation tray1801is 1.5, the at least one processor1600of the refrigerator1000may determine the available amount of water to be discharged at once to be less than 1.5. For example, the at least one processor1600of the refrigerator1000may determine the available amount of water to be discharged at once to be 1.

In an embodiment of the disclosure, the refrigerator1000may determine the available amount of water to be discharged at once by further considering the defrost amount. For example, when the capacity of the evaporation tray1801is 1.5and the defrost amount is 100 g, the at least one processor1600may determine the available amount of water to be discharged at once to be less than 1.4.

In operation S840, the refrigerator1000may operate the first pump630for a period of time corresponding to the determined amount of water. The first pump630may be a pump for discharging the water from the water tank1100onto the evaporation tray1801. When the first pump630operates, the water in the water tank1100may be moved to the drain plate1710under the evaporator1700, and the water moved to the drain plate1710may flow into the drain tube1720through the drain hole1711at the drain plate1710and may be moved to the evaporation tray1801.

In an embodiment of the disclosure, the at least one processor1600of the refrigerator1000may operate the first pump630for a time corresponding to the available amount of water to be discharged at once. For example, when the available amount of water to be discharged at once is 1the at least one processor1600of the refrigerator1000may operate the first pump630for 2 minutes, and when the available amount of water to be discharged at once is 1.2, the at least one processor1600of the refrigerator1000may operate the first pump630for 2 minutes and 20 seconds. The numerical values herein are merely an example, and the disclosure is not limited thereto.

In operation S850, the refrigerator1000may determine whether there is remaining water in the water tank1100.

In an embodiment of the disclosure, the at least one processor1600of the refrigerator1000may operate the first pump630for the time corresponding to the available amount of water to be discharged at once, and then determine whether there is remaining water in the water tank1100. For example, the at least one processor1600of the refrigerator1000may determine whether water continues to be detected by the water detection sensor1500arranged at a location corresponding to the bottom portion of the water tank1100. When the water is detected by the water detection sensor1500, the at least one processor1600may determine that there is remaining water in the water tank1100. On the other hand, when the water is not detected by the water detection sensor1500, the at least one processor1600may determine that there is no remaining water in the water tank1100.

The at least one processor1600may no longer operate the first pump630when there is no remaining water in the water tank in operation S850. In the meantime, when there is no remaining water in the water tank1100, the at least one processor1600may deactivate the operation of the pump (e.g., the water pump or the ice pump) for supplying water into the water supply system. Furthermore, the at least one processor1600may output an alert to replenish the water tank1100with water. The operation of the refrigerator1000when there is no remaining water in the water tank1100will be described in more detail later with reference toFIG.17.

When there is remaining water in the water tank1100in operation S850, the refrigerator1000may determine whether a certain period of time elapses from when the first pump630operates in operation S860. The certain period of time may be a time required for the water discharged onto the evaporation tray1801to be evaporated entirely.

For example, the amount to be discharged at once to the evaporation tray1801from the water tank1100may be determined to be 1, and it may require 12 hours to evaporate 1entirely. In this case, the at least one processor1600of the refrigerator1000may determine whether 12 hours have passed since the water of 1was first discharged to the evaporation tray1801.

The at least one processor1600of the refrigerator1000may keep monitoring whether there is remaining water in the water tank1100without re-operating the first pump630, when the certain period of time is not passed from when the first pump630operates in operation S860.

When the certain period of time is not passed from when the first pump630operates in operation S860, the at least one processor1600of the refrigerator1000may determine that the water discharged onto the evaporation tray180has evaporated entirely, and discharge the remaining water from the water tank1100again. For example, the at least one processor1600of the refrigerator1000may operate the first pump630again for a time corresponding to the available amount of water to be discharged at once.

In other words, in an embodiment of the disclosure, the at least one processor1600of the refrigerator1000may operate the first pump630multiple times at certain time intervals, when the water stored in the water tank1100exceeds the available amount of water to be discharged at once. For example, when the water stored in the water tank1100is 4and the available amount of water to be discharged at once is 1, the at least one processor1600may operate the first pump630four times at the certain time intervals.

In an embodiment of the disclosure, the evaporation tray1801may include an overflow sensor. The at least one processor1600may control the first pump630to block discharging to the evaporation tray1801when detecting through the overflow sensor that a certain amount of water is collected on the evaporation tray1801. In the case that the overflow sensor is included in the evaporation tray1801, the at least one processor1600has only to operate the first pump630according to a signal from the overflow sensor without a need to determine the available amount of water to be discharged at once, so operations S830and S840ofFIG.8may be skipped.

An operation of the refrigerator1000first supplying water into the water supply system (e.g., the ice maker1200or the autofill device1300) before discharging the water to the evaporation tray1801from the water tank1100will now be described in connection withFIGS.10to12.

FIG.10is a flowchart for describing a way of discharging water from the water tank1100, according to an embodiment of the disclosure.FIG.11is a diagram for describing an operation of supplying water from the water tank1100to the ice maker1200, according to an embodiment of the disclosure.FIG.12is a diagram for describing an operation of supplying water to the autofill device1300from the water tank1100, according to an embodiment of the disclosure.

In operation S1010, the refrigerator1000may detect with the water detection sensor1500the water stored in the water tank1100for at least a certain period of time.

In an embodiment of the disclosure, when the water detection sensor1500arranged at a location corresponding to a lowest part of the bottom portion of the water tank1100continues to detect water for at least a certain period of time (e.g., 30 hours), the at least one processor1600of the refrigerator1000may determine that the water has not been completely discharged from the water tank1100and has been stored there for a long time (e.g., at least 30 hours).

In an embodiment of the disclosure, the at least one processor1600of the refrigerator1000may determine whether at least one water supply system is possible to receive water when the water stored in the water tank1100is detected for at least a certain period of time through the water detection sensor1500. When the at least one water supply system is possible to receive water, the at least one processor1600may supply at least a portion of the water stored in the water tank1100into the at least one water supply system before discharging the water in the water tank1100to the evaporation tray1801.

In operation S1020, the refrigerator1000may determine whether forced ice making is possible, when the water stored in the water tank1100is detected for at least the certain period of time. A state in which forced ice making is possible may include a state in which the ice storage container is not full of ice.

In an embodiment of the disclosure, the ice maker1200may include a full-ice detection sensor for detecting full ice stored in the ice storage container. The detecting of the full ice may refer to detecting whether the ice storage container is filled with ice to the maximum capacity.

In an embodiment of the disclosure, the full-ice detection sensor may be implemented in the form of a detection lever that detects physical contact of ice at an upper end portion of the ice storage container. For example, whether the ice storage container is full of ice may be detected while a bar with the full-ice detection sensor attached thereto is going down during an ice separating operation. In this case, the full-ice detection sensor may include a hall sensor.

In an embodiment of the disclosure, the full-ice detection sensor may include a light emitter for irradiating light toward the ice storage container and a light receiver for receiving light reflected from the ice accommodated in the ice storage container. The full-ice detection sensor may detect whether it is full of ice based on intensity of the light received at the light receiver. The example of the full-ice detection sensor is not, however, limited thereto.

In an embodiment of the disclosure, the at least one processor1600of the refrigerator1000may determine that forced ice making is possible when the ice height in the ice storage container included in the ice maker1200is less than a threshold height. For example, the at least one processor1600of the refrigerator1000may determine through the full-ice detection sensor that the ice storage container is not full of ice. The at least one processor1600may determine that it is possible to make additional ice because the ice storage container is not full of ice.

In operation S1030, the refrigerator1000may supply water into the ice maker1200when forced ice making is possible.

Referring toFIG.11, when the forced ice making is possible, the at least one processor1600of the refrigerator1000may control the second pump (ice pump)620to supply at least a portion of the water stored in the water tank1100into the ice maker1200. In an embodiment of the disclosure, although an automatic ice making function of the refrigerator1000is inactive, when the ice storage container1201is not full of ice, the at least one processor1600may operate the second pump620to supply the water in the water tank1100into the ice maker1200.

In operation S1040, the refrigerator1000may determine whether there is remaining water in the water tank1100. For example, the at least one processor1600of the refrigerator1000may supply at least a portion of the water stored in the water tank1100into the ice maker1200and then determine whether there is remaining water in the water tank1100. When only a portion of the water stored in the water tank1100is supplied into the ice maker1200, there may be remaining water in the water tank1100. When the whole water stored in the water tank1100is supplied into the ice maker1200, there may not be remaining water in the water tank1100.

In an embodiment of the disclosure, the at least one processor1600of the refrigerator1000may use the water detection sensor1500to determine whether there is remaining water in the water tank1100. For example, the at least one processor1600of the refrigerator1000may determine whether water continues to be detected by the water detection sensor1500arranged at a location corresponding to the bottom portion of the water tank1100. When the water is detected by the water detection sensor1500, the at least one processor1600may determine that there is remaining water in the water tank1100. On the other hand, when the water is not detected by the water detection sensor1500, the at least one processor1600may determine that there is no remaining water in the water tank1100.

In operation S1050, the refrigerator1000may determine whether it is possible to forcedly perform the autofill function. A state of being able to forcedly perform the autofill function may include a state in which the small water tank (hereinafter, an autofill water tank) included in the autofill device1300is not full of water.

Referring toFIG.12, the autofill water tank1310may include a cover1311, an infuser1312, and a body1313, without being limited thereto. When the autofill function is activated, a certain amount (e.g., 1.4) of water may be maintained in the autofill water tank1310.

In an embodiment of the disclosure, when the height of the water stored in the autofill water tank1310is less than a reference height1314, the at least one processor1600of the refrigerator1000may determine that the autofill device1300is possible to receive water. The reference height1314becomes a reference to determine whether the autofill water tank1310is full of water, and at which the water level sensor is located. In other words, when water is detected by the water level sensor arranged at a location corresponding to a full-water reference line (i.e., the reference height1314), the at least one processor1600may determine that the autofill water tank1310is full of water. On the other hand, when no water is detected by the water level sensor, the at least one processor1600may determine that the autofill water tank1310is not full of water and that the autofill device1300is possible to receive more water.

In operation S1060, the refrigerator1000may supply at least a portion of the water stored in the water tank1100into the autofill device1300when it is possible to forcedly perform the autofill function. For example, the at least one processor1600of the refrigerator1000may supply at least a portion of the water stored in the water tank1100into the autofill device1300when the height of water stored in the small water tank included in the autofill device1300is less than the reference height.

Referring toFIG.12, when the forced performing of the autofill function is possible, the at least one processor1600of the refrigerator1000may control the third pump (water pump)610to supply at least a portion of the water stored in the water tank1100into the autofill device1300. In this case, when the water level sensor of the autofill device1300detects water, it means that the autofill water tank1310is full of ice, so the at least one processor1600may stop operating the third pump610.

In an embodiment of the disclosure, even when the autofill function of the refrigerator1000is inactive, the at least one processor1600may operate the third pump610to supply the water stored in the water tank1100for at least a certain period of time into the autofill device1300.

In operation S1070, the refrigerator1000may determine whether there is remaining water in the water tank1100. For example, the at least one processor1600of the refrigerator1000may determine whether there is remaining water in the water tank1100after supplying at least a portion of the water stored in the water tank1100into the autofill device1300. When only a portion of the water stored in the water tank1100is supplied into the autofill device1300, there may be remaining water in the water tank1100. When the whole water stored in the water tank1100is supplied into the autofill device1300, there may not be remaining water in the water tank1100.

In an embodiment of the disclosure, the at least one processor1600of the refrigerator1000may use the water detection sensor1500to determine whether there is remaining water in the water tank1100. For example, the at least one processor1600of the refrigerator1000may determine whether water continues to be detected by the water detection sensor1500arranged at a location corresponding to the bottom portion of the water tank1100. When the water is detected by the water detection sensor1500, the at least one processor1600may determine that there is remaining water in the water tank1100. On the other hand, when the water is not detected by the water detection sensor1500, the at least one processor1600may determine that there is no remaining water in the water tank1100.

In operation S1080, the refrigerator1000may discharge the remaining water from the water tank1100onto the evaporation tray1801when there is the remaining water in the water tank1100.

In an embodiment of the disclosure, when detecting water stored in the water tank1100through the water detection sensor1500for at least a certain period of time, the at least one processor1600of the refrigerator1000may supply at least a portion of the water stored in the water tank1100into the ice maker1200or the autofill device1300and discharge the remaining water onto the evaporation tray1801through the discharge path for defrost water.

In the meantime, in an embodiment of the disclosure, when the forced ice making is not possible in operation S1020and the forced performing of the autofill function is not possible in operation S1050, the at least one processor1600of the refrigerator1000may discharge the whole water stored in the water tank1100for at least a certain period of time onto the evaporation tray1801through the discharge path for defrost water. For example, when the ice storage container1201of the ice maker1200is full of ice and the autofill water tank1310of the autofill device1300is full of water, the at least one processor1600may discharge the whole water stored in the water tank1100for at least the certain period of time onto the evaporation tray1801through the discharge path for defrost water.

In operation S1090, the refrigerator1000may control the rpm of the air blowing fan1803to a maximum level. For example, the at least one processor1600of the refrigerator1000may control the rpm of the air blowing fan1803to increase the evaporation rate of the water discharged onto the evaporation tray1801.

In an embodiment of the disclosure, the at least one processor1600of the refrigerator1000may prevent the waste of water in the water tank1100by first supplying at least a portion of the water stored in the water tank1100to the ice maker1200or the autofill device1300if possible, when the water stored in the water tank1100for at least a certain period of time is detected.

In the meantime, when detecting the water stored in the water tank1100for at least the certain period of time through the water detection sensor, the refrigerator1000may provide alert for the user to empty the water tank1100. Furthermore, in an embodiment of the disclosure, the refrigerator1000may provide the user with a notification indicating that discharging of the remaining water will be started, when the water of the water tank1100is discharged onto the evaporation tray1801. The operation of the refrigerator1000providing alert to empty the water tank or a notification indicating that discharging of the remaining water will be started will be described in detail with reference toFIGS.13to16.

FIG.13is a flowchart for describing a method of outputting alert to empty the water tank1100or notification indicating that discharging of remaining water will be started, according to an embodiment of the disclosure.

In operation S1310, the refrigerator1000may detect with the water detection sensor1500the water stored in the water tank1100for at least a certain period of time.

In an embodiment of the disclosure, when the water detection sensor1500arranged at a location corresponding to a bottom portion of the water tank1100continues to detect water for at least a certain period of time (e.g., 30 hours), the at least one processor1600of the refrigerator1000may determine that the water has not been completely discharged from the water tank1100and has been stored there for a long time (e.g., at least 30 hours).

In operation S1320, the refrigerator1000may determine whether the user's operation for the refrigerator1000is detected within a certain period of time (e.g., 6 hours) after detecting the water stored in the water tank1100for at least the certain period of time.

The user's operation may include an operation of opening the fridge door or freezer door, an operation of operating a user interface (e.g., screen touch, temperature setting, running an application, inputting notes, etc.), etc., without being limited thereto. The user's operation may include an operation of approaching the refrigerator1000. For example, the refrigerator1000may detect with a human detection sensor that the user is approaching within a certain range from the refrigerator1000.

In operation S1330, the refrigerator1000may output an alert to empty the water tank1100, when the user's operation for the refrigerator1000is detected. For example, the at least one processor1600of the refrigerator1000may display the alert to empty the water tank1100on a display or output the alert in sound through a speaker.

Referring toFIG.14, the at least one processor1600of the refrigerator1000may detect water stored in the water tank for at least a certain period of time (e.g., 30 hours). The at least one processor1600of the refrigerator1000may detect an operation of the user opening the door of the refrigerator1000within a certain time (e.g., 2 hours) from when detecting the water stored in the water tank1100for at least the certain period of time. In this case, the at least one processor1600of the refrigerator1000may output an alert to empty the water from the water tank1100because the water has long been in the water tank1100through an output interface1900. For example, the at least one processor1600of the refrigerator1000may output a notification message1401“water has long been stored. Use the water tank after washing it clean” on the display.

In an embodiment of the disclosure, the refrigerator1000may output the notification to empty the water tank1100through a user equipment connected to the refrigerator1000as well. In this case, the refrigerator1000may be indirectly connected to the user equipment through a server device, or directly connected to the user equipment through short-range communication.

In an embodiment of the disclosure, the server device may include a communication interface for communicating with an external device. The server device may communicate with the refrigerator1000or the user equipment through the communication interface. In an embodiment of the disclosure, the refrigerator1000may transmit identification information of the refrigerator1000or identification information of the user (login information or account information) to the server device, and is able to access the server device after the identification information of the refrigerator1000or the identification information of the user (login information or account information) is authenticated by the server device.

In an embodiment of the disclosure, the server device may include an AI processor. The AI processor may generate an AI model by training an artificial neural network. The training of the artificial neural network may refer to creating a mathematical model in which links of neurons that constitute the artificial neural network are able to make best decision while properly changing weights based on data.

In an embodiment of the disclosure, the user equipment may be a device connected to the server device for displaying information provided by the server device. In an embodiment of the disclosure, the user equipment may exchange information with the server device through a certain application (e.g., a home appliance management application) installed in the user equipment.

In an embodiment of the disclosure, the user equipment may be a device connected to the server device through the same account information with the refrigerator1000. The user equipment may be directly connected to the refrigerator1000through a short-range wireless communication channel or indirectly connected to the refrigerator1000through the server device.

According to an embodiment of the disclosure, the user equipment may be implemented in various forms. For example, the user equipment as described herein may be a mobile terminal, a refrigerator with a display, a television (TV), a computer, an oven with a display, etc., without being limited thereto. The mobile terminal may include a smart phone, a laptop computer, a tablet personal computer (tablet PC), a digital camera, an electronic book (e-book) reader, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), a navigation system, an MP3 player, etc., without being limited thereto. For example, the mobile terminal may include a wearable device that may be worn by the user. An occasion when the user equipment is a smart phone will now be taken as an example, for convenience of explanation.

In an embodiment of the disclosure, a user equipment3000may run a certain application (e.g., the home appliance management application) provided by the server device2000, based on a user input. In this case, the user may check operation status of the refrigerator1000(e.g., fridge temperature or freezer temperature), an image of the inside of the refrigerator, etc., through an execution window of the application.

Referring toFIG.15, the at least one processor1600of the refrigerator1000may send the server device2000, through the communication interface, information indicating that water stored in the water tank1100for at least a certain period of time has been detected, information indicating that water has not been discharged from the water tank1100for at least a certain period of time, information about a time for which water has continued to be detected or information indicating that the water tank1100needs to be emptied.

The server device2000may send the alert to empty the water tank1100to the user equipment3000based on information received from the refrigerator1000. In this case, the user equipment3000may output a notification message1501, “Water has long been stored. Use the water tank after washing it clean” through the execution window of the application. The user may check the notification message1501displayed on the execution window of the application and recognize that the water in the water tank1100is old.

Turning back toFIG.13, in operation S1340, the refrigerator1000may determine whether the water stored in the water tank1100for at least a certain period of time is detected from when the alert to empty the water tank1100is output.

For example, when the user does not empty the water tank1100even after the alert to empty the water tank1100is output, the water detection sensor1500may keep detecting the water stored in the water tank1100. On the other hand, the user may empty the water tank1100after checking the alert to empty the water tank1100. When the user empties the water tank1100, the water detection sensor1500may not detect water stored in the water tank1100. When the user fills the water tank1100with fresh water, the water detection sensor1500may detect the water once again.

In an embodiment of the disclosure, when the water detection sensor1500keeps detecting water because the user does not empty the water tank1100even after the alert to empty the water tank1100is output, the at least one processor1600may perform operation S1350. In other words, the at least one processor1600may control the first pump630to discharge the water stored in the water tank1100onto the evaporation tray1801. On the other hand, in an embodiment of the disclosure, the at least one processor1600may determine that the user has emptied the water tank1100when receiving a signal indicating that water may not be detected from the water detection sensor1500after the alert to empty the water tank1100is output.

In operation S1350, the refrigerator1000may control the first pump630to discharge the water stored in the water tank1110onto the evaporation tray1801, when the user's operation for the refrigerator1000is not detected within a certain time after detecting water stored in the water tank1100for at least a certain period of time.

Even when the refrigerator1000outputs the alert to empty the water tank1100in a case that the user's operation is not detected for a long time, it is difficult for the user to check it out and the user may have difficulty in emptying the water tank1100. For example, the user may go on a trip for a week after filling the water tank1100with water. In this case, the refrigerator1000may not detect the user's operation within a certain period of time, so it may discharge the water stored in the water tank1100onto the evaporation tray1801without outputting the alert to empty the water tank1100on the display of the refrigerator1000.

In operation S1360, in an embodiment of the disclosure, the refrigerator1000may output a notification indicating that discharging of remaining water will be started, when controlling the first pump630to discharge the water stored in the water tank1100onto the evaporation tray1801.

In an embodiment of the disclosure, the at least one processor1600of the refrigerator1000may send the user equipment3000, through the server device2000, a notification message indicating that discharging of remaining water will be started, when controlling the first pump630to discharge the water stored in the water tank1100onto the evaporation tray1801. In this case, the notification message indicating that discharging of the remaining water will be started may be output on the user equipment3000.

Referring toFIG.16, the refrigerator1000may transmit information indicating that discharging of the remaining water from the water tank1100will be started to the server device2000through the communication interface. The server device2000may send the notification indicating that discharging of the remaining water will be started to the user terminal3000based on information received from the refrigerator1000. In this case, the user equipment3000may output a notification message1601“discharging of remaining water will be started” through an execution window of an application. The user may check the notification message1601displayed on the execution window of the application and recognize that the remaining water is being discharged from the water tank1100.

In operations S1370and S1380, in an embodiment of the disclosure, the refrigerator1000may stop operating the first pump630when detecting the user's operation in operation S1370while discharging the water stored in the water tank1100onto the evaporation tray1801. Operation S1330may then be performed.

For example, the at least one processor1600of the refrigerator1000may stop operating the first pump630and output an alert to empty the water tank1100through the output interface1900or the user equipment3000, when detecting the user's operation for the refrigerator1000while discharging the water stored in the water tank1100onto the evaporation tray1801.

An operation of the refrigerator1000when the water tank1100is emptied will now be described in detail with reference toFIG.17.

FIG.17is a flowchart for describing a method of deactivating a pump's operation for supplying water to a water supply system, according to an embodiment of the disclosure.

In operation S1710, in an embodiment of the disclosure, the refrigerator1000may receive, from the water detection sensor1500, a signal indicating that water is not detected in the water tank1100.

In an embodiment of the disclosure, when the water detection sensor1500detects no water, it may mean that there is no remaining water in the water tank1100as the water detection sensor1500is arranged at a location corresponding to a bottom portion of the water tank1100.

In operation S1720, in an embodiment of the disclosure, when receiving, from the water detection sensor1500, the signal indicating that water is not detected in the water tank1100, the refrigerator1000may operate the first pump630to discharge the remaining water in the water tank1100onto the evaporation tray1801.

In an embodiment of the disclosure, as a small amount of remaining water may be left in the water tank1100even when the water is not detected by the water detection sensor1500, the at least one processor1600may operate the first pump630for a certain period of time to completely empty the water tank1100. In the case of completely emptying the water tank1100by operating the first pump630for the certain period of time, it may prevent the water tank1100from going moldy or being incrusted with slime due to the remaining water.

In operation S1730, in an embodiment of the disclosure, the refrigerator1000may deactivate at least one pump (e.g., the water pump610or the ice pump620) for supplying water into at least one water supply system (e.g., the ice maker1200, the autofill device1300or the dispenser1400) when receiving, from the water detection sensor1500, a signal indicating that water is not detected in the water tank1100.

When the pump for supplying water into the water supply system operates while there is no water in the water tank1100, the motor may be rapidly heated, shortening or damaging the lifespan of the pump, causing the pump operation noise to grow louder. Hence, in an embodiment of the disclosure, the at least one processor1600may not operate the pump even when the user operates the lever of the dispenser1400or the automatic ice making function or the autofill function is activated while there is no water in the water tank1100. In this case, the pump may be protected, and an increase in pump operation noise may be prevented.

In operation S1710, in an embodiment of the disclosure, the refrigerator1000may output an alert to replenish the water tank1100with water when receiving, from the water detection sensor1500, a signal indicating that water is not detected in the water tank1100.

For example, the at least one processor1600of the refrigerator1000may output the alert to replenish the water tank1100with water through at least one of the user equipment3000connected to the server device2000, a display or a speaker when receiving, from the water detection sensor1500, the signal indicating that no water is detected in the water tank1100.

The operation of the refrigerator1000outputting the alert to replenish the water tank1100with water will now be further described with reference toFIG.18.

FIG.18is a diagram for describing an operation of outputting alert to replenish the water tank1100with water, according to an embodiment of the disclosure.

Referring toFIG.18, when the at least one processor1600of the refrigerator1000receives a signal indicating that water is not detected in the water tank1100from the water detection sensor1500, it may output an alert to replenish the water tank1100with water through the output interface1900(e.g., a display, a speaker, etc.) of the refrigerator1000.

In an embodiment of the disclosure, when the user is going to use the water in the water tank1100, the at least one processor1600of the refrigerator1000may output an alert to replenish the water tank1100with water through the output interface1900. For example, when receiving an input to activate the automatic ice making function or the autofill function from the user or receiving an input of pressing the lever of the dispenser1400, the at least one processor1600may output the notification message1810“check the water supply sate” or output a warning sound through the speaker. The user may check the notification message1810and replenish the water tank1100with water.

In the meantime, when the at least one processor1600receives, from the user, no input indicating that the user is going to use water in the water tank1100for a certain period of time (e.g., 12 hours) while the water tank1100is empty, the at least one processor1600may monitor whether the water tank1100is replenished with water, and after a lapse of a certain period of time (e.g., 12 hours), output the notification message1810through the output interface1900.

In an embodiment of the disclosure, the alert to replenish the water tank1100with water may be output by the user equipment3000connected to the refrigerator1000through the server device2000. For example, when receiving, from the water detection sensor1500, a signal indicating that no water is detected in the water tank1100, the at least one processor1600of the refrigerator1000may transmit information indicating that the water tank1100is empty or information indicating that water replenishment is required to the server device2000. In this case, the server device2000may output an alert to replenish the water tank1100with water through an execution window of an application installed in the user equipment3000. For example, in the execution window of the application of the user equipment3000, a notification message1820“Check a water supply state. If you use an autofill purifier function, you need to clean the water tank periodically” may be displayed. The user may identify that the water tank1100is empty through the notification message1820, and replenish the water tank1100with water. Accordingly, the pump may be prevented from being damaged by otherwise operating while the water tank1100is empty.

FIG.19is a flowchart for describing a method of outputting alert when the temperature in the refrigerator1000is at least a reference temperature, according to an embodiment of the disclosure.

In operation S1910, in an embodiment of the disclosure, the refrigerator1000may use the water detection sensor1500to determine whether water is detected in the water tank1100. For example, the at least one processor1600of the refrigerator1000may receive a signal indicating that water is detected or a signal indicating that water is not detected from the water detection sensor1500arranged at a location corresponding to the lowest portion of the water tank1100.

In an embodiment of the disclosure, when no water is detected in the water tank1100in operation S1910, the refrigerator1000may perform operation S1720ofFIG.17in operation S1920.

For example, when the signal indicating that no water is detected is received from the water detection sensor1500, the at least one processor1600of the refrigerator1000may deactivate operation of the pump (e.g., the water pump or the ice pump) for supplying water into the water supply system, thereby preventing noise occurrence from the pump. Furthermore, the at least one processor1600of the refrigerator1000may output an alert to replenish the water tank1100with water1100through a display, a speaker or the user equipment3000.

In an embodiment of the disclosure, when water is detected in the water tank1100in operation S1910, the refrigerator1000may determine whether the temperature of the refrigerator1000is at least the reference temperature in operation S1930. For example, the at least one processor160of the refrigerator1000may use at least one temperature sensor arranged in the refrigerator1000to determine whether the temperature in the fridge chamber where the water tank1100is located is at least the reference temperature. The reference temperature may be a temperature at which a harmful substance such as mold may be produced. For example, the reference temperature may be 10° C., but is not limited thereto.

In an embodiment of the disclosure, the temperature of the refrigerator1000may rise to at least the reference temperature in an abnormal situation such as a door being slightly opened, refrigerant being leaked, power outage, etc. In this case, the harmful substance such as mold may spread in the refrigerator1000, so the at least one processor1600may monitor whether the temperature in the fridge chamber rises to at least the reference temperature.

In an embodiment of the disclosure, when the temperature of the refrigerator1000is at least the reference temperature in operation S1930, the refrigerator1000may output an alert to check the temperature in the refrigerator1000or the status of the water tank1100in operation S1940.

For example, when the temperature of the refrigerator1000is at least the reference temperature, the at least one processor1600of the refrigerator1000may output the alert to check the temperature in the refrigerator1000or alert to check the status of the water tank1100through at least one of the user equipment3000connected to the server device2000, a display or a speaker.

In an embodiment of the disclosure, the refrigerator1000may continue to monitor whether the temperature of the refrigerator1000goes down below the reference temperature after outputting the alert to check the temperature in the refrigerator1000or alert to check the status of the water tank1100.

Bacteria that are common sources of contamination do not grow (proliferate) at low temperatures of about 10 degrees or less and high temperatures of about 60 degrees or more, so when the water tank1100and the water supply system are controlled not to rise above about 10 degrees, the occurrence and spread of contamination may be minimized.

In the meantime, in an embodiment of the disclosure, the at least one processor1600may forcedly operate the compressor1804to prevent the spread of contamination, when the temperature in the refrigerator1000is at least the reference temperature.

In an embodiment of the disclosure, when the temperature of the refrigerator1000is lower than the reference temperature in operation S1930, the refrigerator1000may determine whether water is detected in the water tank1100for at least a certain period of time in operation S1950.

In an embodiment of the disclosure, the at least one processor1600of the refrigerator1000may identify a time for which water is continuously detected by the water detection sensor1500. For example, when water is continuously detected by the water detection sensor1500for at least 30 hours, the at least one processor1600of the refrigerator1000may determine that the water has not been discharged from the water tank1100for at least 30 hours.

In an embodiment of the disclosure, when water is detected in the water tank1100for at least a certain period of time in operation S1950, the refrigerator1000may discharge the water from the water tank1100onto the evaporation tray1801in operation S1960.

In an embodiment of the disclosure, when the water stored in the water tank1100is detected for at least a certain period of time by the water detection sensor1500, the refrigerator1000may control the first pump630to discharge the water stored in the water tank1100onto the evaporation tray1801under the condenser1802in the machine room1800by using the discharge path for defrost water. For example, the at least one processor1600of the refrigerator1000may operate the first pump630so that the water in the water tank1100is moved to the drain plate1710under the evaporator1700through the water tank hose1110. The water discharged from the water tank1100to the drain plate1710through the water tank hose1110may flow into the drain tube1720through the drain hole1711of the drain plate1710and arrive at the evaporation tray1801.

In an embodiment of the disclosure, when the water of the water tank1100has not been discharged for a long time, the at least one processor1600may discharge the water from the water tank1100onto the evaporation tray1801so that the water is naturally evaporated, in order to prevent contamination.

The operation of the refrigerator1000outputting the alert to check the temperature in the refrigerator1000or the alert to check the status of the water tank1100will now be further described with reference toFIG.20.

FIG.20is a diagram for describing an operation of outputting alert to check the temperature in the refrigerator1000or alert to check the status of the water tank1100, according to an embodiment of the disclosure.

Referring toFIG.20, the at least one processor1600may identify with a temperature sensor that the temperature of the fridge chamber is 12° C. In this case, the temperature of the fridge chamber is at least reference temperature (e.g., 10° C.), so the at least one processor1600may output the alert to check the temperature in the refrigerator1000or the alert to check the status of the water tank1100through the output interface1900(e.g., a display, a speaker, etc.).

For example, the at least one processor1600may output a notification message2001“Check the temperature of the fridge chamber. Check whether a door is open. If the temperature in the fridge chamber is high, bacteria may reproduce. Check the status of the water tank” on the display, or output warning sound through the speaker. The user may check the notification message2001and check the status of the refrigerator1000or the water tank1100, thereby preventing reproduction of bacteria in the refrigerator1000.

In an embodiment of the disclosure, the alert to check the temperature in the refrigerator1000or the alert to check the status of the water tank1100may be output by the user equipment3000connected to the refrigerator1000through the server device2000. For example, when the temperature of the fridge chamber is identified as being at least the reference temperature, the at least one processor1600of the refrigerator1000may transmit information indicating that the temperature of the fridge chamber is at least the reference temperature or information indicating that the temperature of fridge chamber needs to be checked to the server device2000. In this case, the server device2000may output the alert to check the temperature in the refrigerator1000or the alert to check the status of the water tank1100through an execution window of an application installed in the user equipment3000. For example, in the execution window of the application of the user equipment3000, a notification message2002“Check the temperature of the fridge chamber. If the temperature in the fridge chamber is high, bacteria may reproduce. Check the status of the water tank” may be displayed.

According to an embodiment of the disclosure, the refrigerator1000may be provided to prevent (minimize) contamination of the water supply system by discharging water from the water tank1100onto the evaporation tray1801in the machine room1800through a discharge path for defrost water when the water is left in the water tank1100for a long time.

According to an embodiment of the disclosure, the refrigerator1000may include a main body; a door rotationally or slidably installed at a front of the main body; at least one storage chamber for storing items; the water tank1100arranged in the at least one storage chamber for storing water to be supplied to at least one water supply system; the water detection sensor1500for detecting the water stored in the water tank1500; and the at least one processor1600configured to, when the water stored in the water tank1100is detected for at least a certain period of time by the water detection sensor1500, control the first pump630to discharge the water stored in the water tank1100onto the evaporation tray1801under the condenser1802in the machine room1800by using a discharge path for defrost water. According to an embodiment of the disclosure, the water tank1100may be prevented from being contaminated by remaining water by discharging the water stored in the water tank1100for at least a certain period of time (e.g., 24 hours) onto the evaporation tray1801. As the water discharged onto the evaporation tray1801is naturally evaporated, user convenience may increase. In the meantime, the water stored in the water tank1100is discharged onto the evaporation tray1801through the discharge path for defrost water, eliminating the need to change the system a lot.

In an embodiment of the disclosure, the water detection sensor1500may include at least one of a capacitive sensor, the weight detection sensor1501or a contact-type sensor.

In an embodiment of the disclosure, the inside of the bottom portion of the water tank1100may be spherically or slopingly formed. When the inside of the bottom portion of the water tank1100has the spherical or slanted surface, the remaining water in the water tank1100may be minimized and even if the amount of the remaining water in the water tank1100is so small, the remaining water in the water tank1100can be detected. In an embodiment of the disclosure, the water detection sensor1500may be arranged at a location corresponding to a lowest part of the bottom portion of the water tank1100. When the water detection sensor1500is arranged at the location corresponding to the lowest of the water tank1100, the water detection sensor1500may efficiently detect the remaining water in the water tank1100.

In an embodiment of the disclosure, the at least one processor1600may control revolutions per minute (rpm) of the air blowing fan1803in the machine room1800to a maximum level as the water stored in the water tank1100is discharged onto the evaporation tray1801. In this case, the water discharged onto the evaporation tray1801may be naturally evaporated quickly.

According to an embodiment of the disclosure, the discharge path for defrost water may include the drain tube1720connected from the drain plate1710under the evaporator1700to the evaporation tray1801in the machine room1800.

According to an embodiment of the disclosure, the water tank hose1110for discharging water from the water tank1100may be connected to the drain plate1710under the evaporator1700from the water tank1100. The water discharged from the water tank1100to the drain plate1710through the water tank hose1110may flow into the drain tube1720through the drain hole1711of the drain plate1710and arrive at the evaporation tray1801.

According to an embodiment of the disclosure, the at least one processor1600may determine a time to discharge the water stored in the water tank1100in consideration of discharging intervals of defrost water. The at least one processor1600may prevent the water from overflowing from the evaporation tray1801by determining the time to discharge the water stored in the water tank1100in consideration of the discharging intervals of defrost water.

According to an embodiment of the disclosure, the at least one processor1600may determine an available amount of water to be discharged at once from the water tank1100based on the capacity of the evaporation tray1801. The at least one processor1600may operate the first pump630for a time corresponding to the determined amount of water. The at least one processor1600may prevent water from overflowing from the evaporation tray1801when the water stored in the water tank1100has larger capacity than the evaporation tray1801by determining the available amount of water to be discharged at once.

According to an embodiment of the disclosure, the at least one processor1600may operate the first pump630multiple times at certain time intervals, when the water stored in the water tank1100exceeds the determined amount of water.

According to an embodiment of the disclosure, the water supply system may include at least one of the ice maker1200, the autofill device1300or the dispenser1400.

According to an embodiment of the disclosure, the at least one processor1600may determine whether at least one water supply system is possible to receive water when the water stored in the water tank1100is detected for at least a certain period of time through the water detection sensor1500. When the at least one water supply system is possible to receive water, the at least one processor1600may supply at least a portion of the water stored in the water tank1100into the at least one water supply system. The at least one processor1600may control the first pump630to discharge remaining water in the water tank1100onto the evaporation tray1801in the machine room1800through a discharge path for defrost water after supplying at least a portion of the water stored in the water tank1100to the at least one water supply system. The at least one processor1600may prevent the waste of water by first supplying water in the water tank1100to at least one water supply system before discharging the remaining water onto the evaporation tray1801to be naturally evaporated.

According to an embodiment of the disclosure, the at least one water supply system may include the ice maker1200. The at least one processor1600may determine that the ice maker1200is possible to receive water when the height of ice in the ice storage container1201included in the ice maker1200is less than a threshold height, and control the second pump620to supply at least a portion of the water stored in the water tank1100into the ice maker1200. To prevent contamination of water, freezing and storing the water in the ice maker1200may be more advantageous than storing the water in the water tank1100for a long time

According to an embodiment of the disclosure, the water supply system may include the autofill device1300. The at least one processor1600may determine that the autofill device1300is possible to receive water when the height of water stored in the autofill water tank1310included in the autofill device1300is less than a threshold height, and control the third pump610to supply at least a portion of the water stored in the water tank1100into the autofill device1300. As the autofill water tank1310of the autofill device1300is applied in a separate space and has an environment where bacteria reproduction is more difficult than in the water tank1100because no external contamination is introduced thereto, the water may be moved into the autofill device1300from the water tank1100.

According to an embodiment of the disclosure, the reference height may correspond to the height of the water level sensor for detecting water stored in the autofill water tank1310. According to an embodiment of the disclosure, the at least one processor1600may control the third pump610to supply water into the autofill device1300until the water level sensor detects water.

According to an embodiment of the disclosure, the at least one processor1600may send the user equipment3000, through the server device2000, a notification message indicating that discharging of remaining water will be started, when controlling the first pump630to discharge the water stored in the water tank1100onto the evaporation tray1801. The user may recognize through the notification message the fact that water that has long been stored in the water tank1100is discharged.

According to an embodiment of the disclosure, the at least one processor1600may stop operating the first pump630for discharging the water stored in the water tank1100onto the evaporation tray1801when an operation of the user who uses the refrigerator1000is detected. Alert to empty the water tank1100may be output through a display or a speaker of the refrigerator1000. As the user checks alert or empty the water tank1100in person when the operation of the user is detected, the at least one processor1600may output an alert to empty the water tank1100through the output interface1900of the refrigerator1000.

According to an embodiment of the disclosure, the at least one processor1600may deactivate operation of at least one pump for supplying the water from the water tank1100into the at least one water supply system in response to receiving of a signal indicating that no water is detected in the water tank1100from the water detection sensor1500arranged at a location corresponding to a bottom portion of the water tank1100. The at least one processor1600may prevent the pump from being damaged or from making noise by deactivating operation of the pump connected to the water supply system when there is no water in the water tank1100.

According to an embodiment of the disclosure, the at least one processor1600may output the alert to replenish the water tank1100with water through at least one of the user equipment3000connected to the server device2000, a display or a speaker when receiving, from the water detection sensor1500, the signal indicating that no water is detected in the water tank1100. The user may check the alert for water replenishment and recognize that there is no water in the water tank1100. The user may not operate the water supply system and may replenish the water tank1100with water right away when there is no water in the water tank1100, so the pump may not be forcedly operated without water in the water tank1100and may thus be prevented from being damaged or making noise.

According to an embodiment of the disclosure, the at least one processor1600may operate the first pump630for discharging remaining water from the water tank1100for a certain period of time when receiving, from the water detection sensor1500, the signal indicating that no water is detected in the water tank1100. As the water tank1100is likely to be contaminated by a small amount of remaining water left in the water tank1100even when the water is not detected by the water detection sensor1500, the at least one processor1600may operate the first pump630for a certain period of time to discharge the remaining water.

According to an embodiment of the disclosure, when the temperature of the refrigerator1000is at least the reference temperature, the at least one processor1600may output an alert to check the temperature in the refrigerator1000or alert to check the status of the water tank1100through at least one of the user equipment3000connected to the server device2000, a display or a speaker. The alert may be provided for the user when the temperature of the refrigerator1000is at least the reference temperature, thereby preventing foods in the refrigerator1000from going bad or the water in the water tank1100from being contaminated.

According to an embodiment of the disclosure, a refrigerator1000includes a main body; a door rotationally or slidably installed at a front of the main body; at least one storage chamber configured to store items; a water tank1100arranged in the at least one storage chamber and configured to store water to be supplied to at least one water supply system; a water detection sensor1500configured to detect the water stored in the water tank1100; and at least one processor1600configured to, when the water stored in the water tank1100is detected for at least a certain period of time by the water detection sensor1500and an operation of a user who uses the refrigerator1000is detected, output an alert to empty the water tank1000through at least one of user equipment connected to a server device2000, a display or a speaker.

The machine-readable storage medium may be provided in the form of a non-transitory storage medium. The term ‘non-transitory storage medium’ may mean a tangible device without including a signal, e.g., electromagnetic waves, and may not distinguish between storing data in the storage medium semi-permanently and temporarily. For example, the non-transitory storage medium may include a buffer that temporarily stores data.

In an embodiment of the disclosure, the aforementioned method according to the various embodiments of the disclosure may be provided in a computer program product. The computer program product may be a commercial product that may be traded between a seller and a buyer. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., a compact disc read only memory (CD-ROM) or a universal serial bus (USB) flash drive) or distributed directly between two user devices (e.g., smart phones) or online (e.g., downloaded or uploaded). In the case of the online distribution, at least part of the computer program product (e.g., a downloadable app) may be at least temporarily stored or arbitrarily created in a storage medium that may be readable to a device such as a server of the manufacturer, a server of the application store, or a relay server.